ed1d2b7f923b33334f4b07d288a63015071a3226
[~shefty/rdma-dev.git] / drivers / atm / nicstar.c
1 /*
2  * nicstar.c
3  *
4  * Device driver supporting CBR for IDT 77201/77211 "NICStAR" based cards.
5  *
6  * IMPORTANT: The included file nicstarmac.c was NOT WRITTEN BY ME.
7  *            It was taken from the frle-0.22 device driver.
8  *            As the file doesn't have a copyright notice, in the file
9  *            nicstarmac.copyright I put the copyright notice from the
10  *            frle-0.22 device driver.
11  *            Some code is based on the nicstar driver by M. Welsh.
12  *
13  * Author: Rui Prior (rprior@inescn.pt)
14  * PowerPC support by Jay Talbott (jay_talbott@mcg.mot.com) April 1999
15  *
16  *
17  * (C) INESC 1999
18  */
19
20 /*
21  * IMPORTANT INFORMATION
22  *
23  * There are currently three types of spinlocks:
24  *
25  * 1 - Per card interrupt spinlock (to protect structures and such)
26  * 2 - Per SCQ scq spinlock
27  * 3 - Per card resource spinlock (to access registers, etc.)
28  *
29  * These must NEVER be grabbed in reverse order.
30  *
31  */
32
33 /* Header files */
34
35 #include <linux/module.h>
36 #include <linux/kernel.h>
37 #include <linux/skbuff.h>
38 #include <linux/atmdev.h>
39 #include <linux/atm.h>
40 #include <linux/pci.h>
41 #include <linux/dma-mapping.h>
42 #include <linux/types.h>
43 #include <linux/string.h>
44 #include <linux/delay.h>
45 #include <linux/init.h>
46 #include <linux/sched.h>
47 #include <linux/timer.h>
48 #include <linux/interrupt.h>
49 #include <linux/bitops.h>
50 #include <linux/slab.h>
51 #include <linux/idr.h>
52 #include <asm/io.h>
53 #include <asm/uaccess.h>
54 #include <linux/atomic.h>
55 #include "nicstar.h"
56 #ifdef CONFIG_ATM_NICSTAR_USE_SUNI
57 #include "suni.h"
58 #endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
59 #ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
60 #include "idt77105.h"
61 #endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */
62
63 /* Additional code */
64
65 #include "nicstarmac.c"
66
67 /* Configurable parameters */
68
69 #undef PHY_LOOPBACK
70 #undef TX_DEBUG
71 #undef RX_DEBUG
72 #undef GENERAL_DEBUG
73 #undef EXTRA_DEBUG
74
75 #undef NS_USE_DESTRUCTORS       /* For now keep this undefined unless you know
76                                    you're going to use only raw ATM */
77
78 /* Do not touch these */
79
80 #ifdef TX_DEBUG
81 #define TXPRINTK(args...) printk(args)
82 #else
83 #define TXPRINTK(args...)
84 #endif /* TX_DEBUG */
85
86 #ifdef RX_DEBUG
87 #define RXPRINTK(args...) printk(args)
88 #else
89 #define RXPRINTK(args...)
90 #endif /* RX_DEBUG */
91
92 #ifdef GENERAL_DEBUG
93 #define PRINTK(args...) printk(args)
94 #else
95 #define PRINTK(args...)
96 #endif /* GENERAL_DEBUG */
97
98 #ifdef EXTRA_DEBUG
99 #define XPRINTK(args...) printk(args)
100 #else
101 #define XPRINTK(args...)
102 #endif /* EXTRA_DEBUG */
103
104 /* Macros */
105
106 #define CMD_BUSY(card) (readl((card)->membase + STAT) & NS_STAT_CMDBZ)
107
108 #define NS_DELAY mdelay(1)
109
110 #define PTR_DIFF(a, b)  ((u32)((unsigned long)(a) - (unsigned long)(b)))
111
112 #ifndef ATM_SKB
113 #define ATM_SKB(s) (&(s)->atm)
114 #endif
115
116 #define scq_virt_to_bus(scq, p) \
117                 (scq->dma + ((unsigned long)(p) - (unsigned long)(scq)->org))
118
119 /* Function declarations */
120
121 static u32 ns_read_sram(ns_dev * card, u32 sram_address);
122 static void ns_write_sram(ns_dev * card, u32 sram_address, u32 * value,
123                           int count);
124 static int ns_init_card(int i, struct pci_dev *pcidev);
125 static void ns_init_card_error(ns_dev * card, int error);
126 static scq_info *get_scq(ns_dev *card, int size, u32 scd);
127 static void free_scq(ns_dev *card, scq_info * scq, struct atm_vcc *vcc);
128 static void push_rxbufs(ns_dev *, struct sk_buff *);
129 static irqreturn_t ns_irq_handler(int irq, void *dev_id);
130 static int ns_open(struct atm_vcc *vcc);
131 static void ns_close(struct atm_vcc *vcc);
132 static void fill_tst(ns_dev * card, int n, vc_map * vc);
133 static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb);
134 static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
135                      struct sk_buff *skb);
136 static void process_tsq(ns_dev * card);
137 static void drain_scq(ns_dev * card, scq_info * scq, int pos);
138 static void process_rsq(ns_dev * card);
139 static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe);
140 #ifdef NS_USE_DESTRUCTORS
141 static void ns_sb_destructor(struct sk_buff *sb);
142 static void ns_lb_destructor(struct sk_buff *lb);
143 static void ns_hb_destructor(struct sk_buff *hb);
144 #endif /* NS_USE_DESTRUCTORS */
145 static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb);
146 static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count);
147 static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb);
148 static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb);
149 static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb);
150 static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page);
151 static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg);
152 #ifdef EXTRA_DEBUG
153 static void which_list(ns_dev * card, struct sk_buff *skb);
154 #endif
155 static void ns_poll(unsigned long arg);
156 static int ns_parse_mac(char *mac, unsigned char *esi);
157 static void ns_phy_put(struct atm_dev *dev, unsigned char value,
158                        unsigned long addr);
159 static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr);
160
161 /* Global variables */
162
163 static struct ns_dev *cards[NS_MAX_CARDS];
164 static unsigned num_cards;
165 static struct atmdev_ops atm_ops = {
166         .open = ns_open,
167         .close = ns_close,
168         .ioctl = ns_ioctl,
169         .send = ns_send,
170         .phy_put = ns_phy_put,
171         .phy_get = ns_phy_get,
172         .proc_read = ns_proc_read,
173         .owner = THIS_MODULE,
174 };
175
176 static struct timer_list ns_timer;
177 static char *mac[NS_MAX_CARDS];
178 module_param_array(mac, charp, NULL, 0);
179 MODULE_LICENSE("GPL");
180
181 /* Functions */
182
183 static int nicstar_init_one(struct pci_dev *pcidev,
184                             const struct pci_device_id *ent)
185 {
186         static int index = -1;
187         unsigned int error;
188
189         index++;
190         cards[index] = NULL;
191
192         error = ns_init_card(index, pcidev);
193         if (error) {
194                 cards[index--] = NULL;  /* don't increment index */
195                 goto err_out;
196         }
197
198         return 0;
199 err_out:
200         return -ENODEV;
201 }
202
203 static void nicstar_remove_one(struct pci_dev *pcidev)
204 {
205         int i, j;
206         ns_dev *card = pci_get_drvdata(pcidev);
207         struct sk_buff *hb;
208         struct sk_buff *iovb;
209         struct sk_buff *lb;
210         struct sk_buff *sb;
211
212         i = card->index;
213
214         if (cards[i] == NULL)
215                 return;
216
217         if (card->atmdev->phy && card->atmdev->phy->stop)
218                 card->atmdev->phy->stop(card->atmdev);
219
220         /* Stop everything */
221         writel(0x00000000, card->membase + CFG);
222
223         /* De-register device */
224         atm_dev_deregister(card->atmdev);
225
226         /* Disable PCI device */
227         pci_disable_device(pcidev);
228
229         /* Free up resources */
230         j = 0;
231         PRINTK("nicstar%d: freeing %d huge buffers.\n", i, card->hbpool.count);
232         while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL) {
233                 dev_kfree_skb_any(hb);
234                 j++;
235         }
236         PRINTK("nicstar%d: %d huge buffers freed.\n", i, j);
237         j = 0;
238         PRINTK("nicstar%d: freeing %d iovec buffers.\n", i,
239                card->iovpool.count);
240         while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL) {
241                 dev_kfree_skb_any(iovb);
242                 j++;
243         }
244         PRINTK("nicstar%d: %d iovec buffers freed.\n", i, j);
245         while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
246                 dev_kfree_skb_any(lb);
247         while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
248                 dev_kfree_skb_any(sb);
249         free_scq(card, card->scq0, NULL);
250         for (j = 0; j < NS_FRSCD_NUM; j++) {
251                 if (card->scd2vc[j] != NULL)
252                         free_scq(card, card->scd2vc[j]->scq, card->scd2vc[j]->tx_vcc);
253         }
254         idr_remove_all(&card->idr);
255         idr_destroy(&card->idr);
256         pci_free_consistent(card->pcidev, NS_RSQSIZE + NS_RSQ_ALIGNMENT,
257                             card->rsq.org, card->rsq.dma);
258         pci_free_consistent(card->pcidev, NS_TSQSIZE + NS_TSQ_ALIGNMENT,
259                             card->tsq.org, card->tsq.dma);
260         free_irq(card->pcidev->irq, card);
261         iounmap(card->membase);
262         kfree(card);
263 }
264
265 static struct pci_device_id nicstar_pci_tbl[] = {
266         { PCI_VDEVICE(IDT, PCI_DEVICE_ID_IDT_IDT77201), 0 },
267         {0,}                    /* terminate list */
268 };
269
270 MODULE_DEVICE_TABLE(pci, nicstar_pci_tbl);
271
272 static struct pci_driver nicstar_driver = {
273         .name = "nicstar",
274         .id_table = nicstar_pci_tbl,
275         .probe = nicstar_init_one,
276         .remove = nicstar_remove_one,
277 };
278
279 static int __init nicstar_init(void)
280 {
281         unsigned error = 0;     /* Initialized to remove compile warning */
282
283         XPRINTK("nicstar: nicstar_init() called.\n");
284
285         error = pci_register_driver(&nicstar_driver);
286
287         TXPRINTK("nicstar: TX debug enabled.\n");
288         RXPRINTK("nicstar: RX debug enabled.\n");
289         PRINTK("nicstar: General debug enabled.\n");
290 #ifdef PHY_LOOPBACK
291         printk("nicstar: using PHY loopback.\n");
292 #endif /* PHY_LOOPBACK */
293         XPRINTK("nicstar: nicstar_init() returned.\n");
294
295         if (!error) {
296                 init_timer(&ns_timer);
297                 ns_timer.expires = jiffies + NS_POLL_PERIOD;
298                 ns_timer.data = 0UL;
299                 ns_timer.function = ns_poll;
300                 add_timer(&ns_timer);
301         }
302
303         return error;
304 }
305
306 static void __exit nicstar_cleanup(void)
307 {
308         XPRINTK("nicstar: nicstar_cleanup() called.\n");
309
310         del_timer(&ns_timer);
311
312         pci_unregister_driver(&nicstar_driver);
313
314         XPRINTK("nicstar: nicstar_cleanup() returned.\n");
315 }
316
317 static u32 ns_read_sram(ns_dev * card, u32 sram_address)
318 {
319         unsigned long flags;
320         u32 data;
321         sram_address <<= 2;
322         sram_address &= 0x0007FFFC;     /* address must be dword aligned */
323         sram_address |= 0x50000000;     /* SRAM read command */
324         spin_lock_irqsave(&card->res_lock, flags);
325         while (CMD_BUSY(card)) ;
326         writel(sram_address, card->membase + CMD);
327         while (CMD_BUSY(card)) ;
328         data = readl(card->membase + DR0);
329         spin_unlock_irqrestore(&card->res_lock, flags);
330         return data;
331 }
332
333 static void ns_write_sram(ns_dev * card, u32 sram_address, u32 * value,
334                           int count)
335 {
336         unsigned long flags;
337         int i, c;
338         count--;                /* count range now is 0..3 instead of 1..4 */
339         c = count;
340         c <<= 2;                /* to use increments of 4 */
341         spin_lock_irqsave(&card->res_lock, flags);
342         while (CMD_BUSY(card)) ;
343         for (i = 0; i <= c; i += 4)
344                 writel(*(value++), card->membase + i);
345         /* Note: DR# registers are the first 4 dwords in nicstar's memspace,
346            so card->membase + DR0 == card->membase */
347         sram_address <<= 2;
348         sram_address &= 0x0007FFFC;
349         sram_address |= (0x40000000 | count);
350         writel(sram_address, card->membase + CMD);
351         spin_unlock_irqrestore(&card->res_lock, flags);
352 }
353
354 static int ns_init_card(int i, struct pci_dev *pcidev)
355 {
356         int j;
357         struct ns_dev *card = NULL;
358         unsigned char pci_latency;
359         unsigned error;
360         u32 data;
361         u32 u32d[4];
362         u32 ns_cfg_rctsize;
363         int bcount;
364         unsigned long membase;
365
366         error = 0;
367
368         if (pci_enable_device(pcidev)) {
369                 printk("nicstar%d: can't enable PCI device\n", i);
370                 error = 2;
371                 ns_init_card_error(card, error);
372                 return error;
373         }
374         if ((pci_set_dma_mask(pcidev, DMA_BIT_MASK(32)) != 0) ||
375             (pci_set_consistent_dma_mask(pcidev, DMA_BIT_MASK(32)) != 0)) {
376                 printk(KERN_WARNING
377                        "nicstar%d: No suitable DMA available.\n", i);
378                 error = 2;
379                 ns_init_card_error(card, error);
380                 return error;
381         }
382
383         if ((card = kmalloc(sizeof(ns_dev), GFP_KERNEL)) == NULL) {
384                 printk
385                     ("nicstar%d: can't allocate memory for device structure.\n",
386                      i);
387                 error = 2;
388                 ns_init_card_error(card, error);
389                 return error;
390         }
391         cards[i] = card;
392         spin_lock_init(&card->int_lock);
393         spin_lock_init(&card->res_lock);
394
395         pci_set_drvdata(pcidev, card);
396
397         card->index = i;
398         card->atmdev = NULL;
399         card->pcidev = pcidev;
400         membase = pci_resource_start(pcidev, 1);
401         card->membase = ioremap(membase, NS_IOREMAP_SIZE);
402         if (!card->membase) {
403                 printk("nicstar%d: can't ioremap() membase.\n", i);
404                 error = 3;
405                 ns_init_card_error(card, error);
406                 return error;
407         }
408         PRINTK("nicstar%d: membase at 0x%p.\n", i, card->membase);
409
410         pci_set_master(pcidev);
411
412         if (pci_read_config_byte(pcidev, PCI_LATENCY_TIMER, &pci_latency) != 0) {
413                 printk("nicstar%d: can't read PCI latency timer.\n", i);
414                 error = 6;
415                 ns_init_card_error(card, error);
416                 return error;
417         }
418 #ifdef NS_PCI_LATENCY
419         if (pci_latency < NS_PCI_LATENCY) {
420                 PRINTK("nicstar%d: setting PCI latency timer to %d.\n", i,
421                        NS_PCI_LATENCY);
422                 for (j = 1; j < 4; j++) {
423                         if (pci_write_config_byte
424                             (pcidev, PCI_LATENCY_TIMER, NS_PCI_LATENCY) != 0)
425                                 break;
426                 }
427                 if (j == 4) {
428                         printk
429                             ("nicstar%d: can't set PCI latency timer to %d.\n",
430                              i, NS_PCI_LATENCY);
431                         error = 7;
432                         ns_init_card_error(card, error);
433                         return error;
434                 }
435         }
436 #endif /* NS_PCI_LATENCY */
437
438         /* Clear timer overflow */
439         data = readl(card->membase + STAT);
440         if (data & NS_STAT_TMROF)
441                 writel(NS_STAT_TMROF, card->membase + STAT);
442
443         /* Software reset */
444         writel(NS_CFG_SWRST, card->membase + CFG);
445         NS_DELAY;
446         writel(0x00000000, card->membase + CFG);
447
448         /* PHY reset */
449         writel(0x00000008, card->membase + GP);
450         NS_DELAY;
451         writel(0x00000001, card->membase + GP);
452         NS_DELAY;
453         while (CMD_BUSY(card)) ;
454         writel(NS_CMD_WRITE_UTILITY | 0x00000100, card->membase + CMD); /* Sync UTOPIA with SAR clock */
455         NS_DELAY;
456
457         /* Detect PHY type */
458         while (CMD_BUSY(card)) ;
459         writel(NS_CMD_READ_UTILITY | 0x00000200, card->membase + CMD);
460         while (CMD_BUSY(card)) ;
461         data = readl(card->membase + DR0);
462         switch (data) {
463         case 0x00000009:
464                 printk("nicstar%d: PHY seems to be 25 Mbps.\n", i);
465                 card->max_pcr = ATM_25_PCR;
466                 while (CMD_BUSY(card)) ;
467                 writel(0x00000008, card->membase + DR0);
468                 writel(NS_CMD_WRITE_UTILITY | 0x00000200, card->membase + CMD);
469                 /* Clear an eventual pending interrupt */
470                 writel(NS_STAT_SFBQF, card->membase + STAT);
471 #ifdef PHY_LOOPBACK
472                 while (CMD_BUSY(card)) ;
473                 writel(0x00000022, card->membase + DR0);
474                 writel(NS_CMD_WRITE_UTILITY | 0x00000202, card->membase + CMD);
475 #endif /* PHY_LOOPBACK */
476                 break;
477         case 0x00000030:
478         case 0x00000031:
479                 printk("nicstar%d: PHY seems to be 155 Mbps.\n", i);
480                 card->max_pcr = ATM_OC3_PCR;
481 #ifdef PHY_LOOPBACK
482                 while (CMD_BUSY(card)) ;
483                 writel(0x00000002, card->membase + DR0);
484                 writel(NS_CMD_WRITE_UTILITY | 0x00000205, card->membase + CMD);
485 #endif /* PHY_LOOPBACK */
486                 break;
487         default:
488                 printk("nicstar%d: unknown PHY type (0x%08X).\n", i, data);
489                 error = 8;
490                 ns_init_card_error(card, error);
491                 return error;
492         }
493         writel(0x00000000, card->membase + GP);
494
495         /* Determine SRAM size */
496         data = 0x76543210;
497         ns_write_sram(card, 0x1C003, &data, 1);
498         data = 0x89ABCDEF;
499         ns_write_sram(card, 0x14003, &data, 1);
500         if (ns_read_sram(card, 0x14003) == 0x89ABCDEF &&
501             ns_read_sram(card, 0x1C003) == 0x76543210)
502                 card->sram_size = 128;
503         else
504                 card->sram_size = 32;
505         PRINTK("nicstar%d: %dK x 32bit SRAM size.\n", i, card->sram_size);
506
507         card->rct_size = NS_MAX_RCTSIZE;
508
509 #if (NS_MAX_RCTSIZE == 4096)
510         if (card->sram_size == 128)
511                 printk
512                     ("nicstar%d: limiting maximum VCI. See NS_MAX_RCTSIZE in nicstar.h\n",
513                      i);
514 #elif (NS_MAX_RCTSIZE == 16384)
515         if (card->sram_size == 32) {
516                 printk
517                     ("nicstar%d: wasting memory. See NS_MAX_RCTSIZE in nicstar.h\n",
518                      i);
519                 card->rct_size = 4096;
520         }
521 #else
522 #error NS_MAX_RCTSIZE must be either 4096 or 16384 in nicstar.c
523 #endif
524
525         card->vpibits = NS_VPIBITS;
526         if (card->rct_size == 4096)
527                 card->vcibits = 12 - NS_VPIBITS;
528         else                    /* card->rct_size == 16384 */
529                 card->vcibits = 14 - NS_VPIBITS;
530
531         /* Initialize the nicstar eeprom/eprom stuff, for the MAC addr */
532         if (mac[i] == NULL)
533                 nicstar_init_eprom(card->membase);
534
535         /* Set the VPI/VCI MSb mask to zero so we can receive OAM cells */
536         writel(0x00000000, card->membase + VPM);
537
538         /* Initialize TSQ */
539         card->tsq.org = pci_alloc_consistent(card->pcidev,
540                                              NS_TSQSIZE + NS_TSQ_ALIGNMENT,
541                                              &card->tsq.dma);
542         if (card->tsq.org == NULL) {
543                 printk("nicstar%d: can't allocate TSQ.\n", i);
544                 error = 10;
545                 ns_init_card_error(card, error);
546                 return error;
547         }
548         card->tsq.base = PTR_ALIGN(card->tsq.org, NS_TSQ_ALIGNMENT);
549         card->tsq.next = card->tsq.base;
550         card->tsq.last = card->tsq.base + (NS_TSQ_NUM_ENTRIES - 1);
551         for (j = 0; j < NS_TSQ_NUM_ENTRIES; j++)
552                 ns_tsi_init(card->tsq.base + j);
553         writel(0x00000000, card->membase + TSQH);
554         writel(ALIGN(card->tsq.dma, NS_TSQ_ALIGNMENT), card->membase + TSQB);
555         PRINTK("nicstar%d: TSQ base at 0x%p.\n", i, card->tsq.base);
556
557         /* Initialize RSQ */
558         card->rsq.org = pci_alloc_consistent(card->pcidev,
559                                              NS_RSQSIZE + NS_RSQ_ALIGNMENT,
560                                              &card->rsq.dma);
561         if (card->rsq.org == NULL) {
562                 printk("nicstar%d: can't allocate RSQ.\n", i);
563                 error = 11;
564                 ns_init_card_error(card, error);
565                 return error;
566         }
567         card->rsq.base = PTR_ALIGN(card->rsq.org, NS_RSQ_ALIGNMENT);
568         card->rsq.next = card->rsq.base;
569         card->rsq.last = card->rsq.base + (NS_RSQ_NUM_ENTRIES - 1);
570         for (j = 0; j < NS_RSQ_NUM_ENTRIES; j++)
571                 ns_rsqe_init(card->rsq.base + j);
572         writel(0x00000000, card->membase + RSQH);
573         writel(ALIGN(card->rsq.dma, NS_RSQ_ALIGNMENT), card->membase + RSQB);
574         PRINTK("nicstar%d: RSQ base at 0x%p.\n", i, card->rsq.base);
575
576         /* Initialize SCQ0, the only VBR SCQ used */
577         card->scq1 = NULL;
578         card->scq2 = NULL;
579         card->scq0 = get_scq(card, VBR_SCQSIZE, NS_VRSCD0);
580         if (card->scq0 == NULL) {
581                 printk("nicstar%d: can't get SCQ0.\n", i);
582                 error = 12;
583                 ns_init_card_error(card, error);
584                 return error;
585         }
586         u32d[0] = scq_virt_to_bus(card->scq0, card->scq0->base);
587         u32d[1] = (u32) 0x00000000;
588         u32d[2] = (u32) 0xffffffff;
589         u32d[3] = (u32) 0x00000000;
590         ns_write_sram(card, NS_VRSCD0, u32d, 4);
591         ns_write_sram(card, NS_VRSCD1, u32d, 4);        /* These last two won't be used */
592         ns_write_sram(card, NS_VRSCD2, u32d, 4);        /* but are initialized, just in case... */
593         card->scq0->scd = NS_VRSCD0;
594         PRINTK("nicstar%d: VBR-SCQ0 base at 0x%p.\n", i, card->scq0->base);
595
596         /* Initialize TSTs */
597         card->tst_addr = NS_TST0;
598         card->tst_free_entries = NS_TST_NUM_ENTRIES;
599         data = NS_TST_OPCODE_VARIABLE;
600         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
601                 ns_write_sram(card, NS_TST0 + j, &data, 1);
602         data = ns_tste_make(NS_TST_OPCODE_END, NS_TST0);
603         ns_write_sram(card, NS_TST0 + NS_TST_NUM_ENTRIES, &data, 1);
604         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
605                 ns_write_sram(card, NS_TST1 + j, &data, 1);
606         data = ns_tste_make(NS_TST_OPCODE_END, NS_TST1);
607         ns_write_sram(card, NS_TST1 + NS_TST_NUM_ENTRIES, &data, 1);
608         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
609                 card->tste2vc[j] = NULL;
610         writel(NS_TST0 << 2, card->membase + TSTB);
611
612         /* Initialize RCT. AAL type is set on opening the VC. */
613 #ifdef RCQ_SUPPORT
614         u32d[0] = NS_RCTE_RAWCELLINTEN;
615 #else
616         u32d[0] = 0x00000000;
617 #endif /* RCQ_SUPPORT */
618         u32d[1] = 0x00000000;
619         u32d[2] = 0x00000000;
620         u32d[3] = 0xFFFFFFFF;
621         for (j = 0; j < card->rct_size; j++)
622                 ns_write_sram(card, j * 4, u32d, 4);
623
624         memset(card->vcmap, 0, NS_MAX_RCTSIZE * sizeof(vc_map));
625
626         for (j = 0; j < NS_FRSCD_NUM; j++)
627                 card->scd2vc[j] = NULL;
628
629         /* Initialize buffer levels */
630         card->sbnr.min = MIN_SB;
631         card->sbnr.init = NUM_SB;
632         card->sbnr.max = MAX_SB;
633         card->lbnr.min = MIN_LB;
634         card->lbnr.init = NUM_LB;
635         card->lbnr.max = MAX_LB;
636         card->iovnr.min = MIN_IOVB;
637         card->iovnr.init = NUM_IOVB;
638         card->iovnr.max = MAX_IOVB;
639         card->hbnr.min = MIN_HB;
640         card->hbnr.init = NUM_HB;
641         card->hbnr.max = MAX_HB;
642
643         card->sm_handle = 0x00000000;
644         card->sm_addr = 0x00000000;
645         card->lg_handle = 0x00000000;
646         card->lg_addr = 0x00000000;
647
648         card->efbie = 1;        /* To prevent push_rxbufs from enabling the interrupt */
649
650         idr_init(&card->idr);
651
652         /* Pre-allocate some huge buffers */
653         skb_queue_head_init(&card->hbpool.queue);
654         card->hbpool.count = 0;
655         for (j = 0; j < NUM_HB; j++) {
656                 struct sk_buff *hb;
657                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
658                 if (hb == NULL) {
659                         printk
660                             ("nicstar%d: can't allocate %dth of %d huge buffers.\n",
661                              i, j, NUM_HB);
662                         error = 13;
663                         ns_init_card_error(card, error);
664                         return error;
665                 }
666                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
667                 skb_queue_tail(&card->hbpool.queue, hb);
668                 card->hbpool.count++;
669         }
670
671         /* Allocate large buffers */
672         skb_queue_head_init(&card->lbpool.queue);
673         card->lbpool.count = 0; /* Not used */
674         for (j = 0; j < NUM_LB; j++) {
675                 struct sk_buff *lb;
676                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
677                 if (lb == NULL) {
678                         printk
679                             ("nicstar%d: can't allocate %dth of %d large buffers.\n",
680                              i, j, NUM_LB);
681                         error = 14;
682                         ns_init_card_error(card, error);
683                         return error;
684                 }
685                 NS_PRV_BUFTYPE(lb) = BUF_LG;
686                 skb_queue_tail(&card->lbpool.queue, lb);
687                 skb_reserve(lb, NS_SMBUFSIZE);
688                 push_rxbufs(card, lb);
689                 /* Due to the implementation of push_rxbufs() this is 1, not 0 */
690                 if (j == 1) {
691                         card->rcbuf = lb;
692                         card->rawcell = (struct ns_rcqe *) lb->data;
693                         card->rawch = NS_PRV_DMA(lb);
694                 }
695         }
696         /* Test for strange behaviour which leads to crashes */
697         if ((bcount =
698              ns_stat_lfbqc_get(readl(card->membase + STAT))) < card->lbnr.min) {
699                 printk
700                     ("nicstar%d: Strange... Just allocated %d large buffers and lfbqc = %d.\n",
701                      i, j, bcount);
702                 error = 14;
703                 ns_init_card_error(card, error);
704                 return error;
705         }
706
707         /* Allocate small buffers */
708         skb_queue_head_init(&card->sbpool.queue);
709         card->sbpool.count = 0; /* Not used */
710         for (j = 0; j < NUM_SB; j++) {
711                 struct sk_buff *sb;
712                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
713                 if (sb == NULL) {
714                         printk
715                             ("nicstar%d: can't allocate %dth of %d small buffers.\n",
716                              i, j, NUM_SB);
717                         error = 15;
718                         ns_init_card_error(card, error);
719                         return error;
720                 }
721                 NS_PRV_BUFTYPE(sb) = BUF_SM;
722                 skb_queue_tail(&card->sbpool.queue, sb);
723                 skb_reserve(sb, NS_AAL0_HEADER);
724                 push_rxbufs(card, sb);
725         }
726         /* Test for strange behaviour which leads to crashes */
727         if ((bcount =
728              ns_stat_sfbqc_get(readl(card->membase + STAT))) < card->sbnr.min) {
729                 printk
730                     ("nicstar%d: Strange... Just allocated %d small buffers and sfbqc = %d.\n",
731                      i, j, bcount);
732                 error = 15;
733                 ns_init_card_error(card, error);
734                 return error;
735         }
736
737         /* Allocate iovec buffers */
738         skb_queue_head_init(&card->iovpool.queue);
739         card->iovpool.count = 0;
740         for (j = 0; j < NUM_IOVB; j++) {
741                 struct sk_buff *iovb;
742                 iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
743                 if (iovb == NULL) {
744                         printk
745                             ("nicstar%d: can't allocate %dth of %d iovec buffers.\n",
746                              i, j, NUM_IOVB);
747                         error = 16;
748                         ns_init_card_error(card, error);
749                         return error;
750                 }
751                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
752                 skb_queue_tail(&card->iovpool.queue, iovb);
753                 card->iovpool.count++;
754         }
755
756         /* Configure NICStAR */
757         if (card->rct_size == 4096)
758                 ns_cfg_rctsize = NS_CFG_RCTSIZE_4096_ENTRIES;
759         else                    /* (card->rct_size == 16384) */
760                 ns_cfg_rctsize = NS_CFG_RCTSIZE_16384_ENTRIES;
761
762         card->efbie = 1;
763
764         card->intcnt = 0;
765         if (request_irq
766             (pcidev->irq, &ns_irq_handler, IRQF_SHARED, "nicstar", card) != 0) {
767                 printk("nicstar%d: can't allocate IRQ %d.\n", i, pcidev->irq);
768                 error = 9;
769                 ns_init_card_error(card, error);
770                 return error;
771         }
772
773         /* Register device */
774         card->atmdev = atm_dev_register("nicstar", &card->pcidev->dev, &atm_ops,
775                                         -1, NULL);
776         if (card->atmdev == NULL) {
777                 printk("nicstar%d: can't register device.\n", i);
778                 error = 17;
779                 ns_init_card_error(card, error);
780                 return error;
781         }
782
783         if (ns_parse_mac(mac[i], card->atmdev->esi)) {
784                 nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET,
785                                    card->atmdev->esi, 6);
786                 if (memcmp(card->atmdev->esi, "\x00\x00\x00\x00\x00\x00", 6) ==
787                     0) {
788                         nicstar_read_eprom(card->membase,
789                                            NICSTAR_EPROM_MAC_ADDR_OFFSET_ALT,
790                                            card->atmdev->esi, 6);
791                 }
792         }
793
794         printk("nicstar%d: MAC address %pM\n", i, card->atmdev->esi);
795
796         card->atmdev->dev_data = card;
797         card->atmdev->ci_range.vpi_bits = card->vpibits;
798         card->atmdev->ci_range.vci_bits = card->vcibits;
799         card->atmdev->link_rate = card->max_pcr;
800         card->atmdev->phy = NULL;
801
802 #ifdef CONFIG_ATM_NICSTAR_USE_SUNI
803         if (card->max_pcr == ATM_OC3_PCR)
804                 suni_init(card->atmdev);
805 #endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
806
807 #ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
808         if (card->max_pcr == ATM_25_PCR)
809                 idt77105_init(card->atmdev);
810 #endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */
811
812         if (card->atmdev->phy && card->atmdev->phy->start)
813                 card->atmdev->phy->start(card->atmdev);
814
815         writel(NS_CFG_RXPATH | NS_CFG_SMBUFSIZE | NS_CFG_LGBUFSIZE | NS_CFG_EFBIE | NS_CFG_RSQSIZE | NS_CFG_VPIBITS | ns_cfg_rctsize | NS_CFG_RXINT_NODELAY | NS_CFG_RAWIE |    /* Only enabled if RCQ_SUPPORT */
816                NS_CFG_RSQAFIE | NS_CFG_TXEN | NS_CFG_TXIE | NS_CFG_TSQFIE_OPT | /* Only enabled if ENABLE_TSQFIE */
817                NS_CFG_PHYIE, card->membase + CFG);
818
819         num_cards++;
820
821         return error;
822 }
823
824 static void ns_init_card_error(ns_dev *card, int error)
825 {
826         if (error >= 17) {
827                 writel(0x00000000, card->membase + CFG);
828         }
829         if (error >= 16) {
830                 struct sk_buff *iovb;
831                 while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL)
832                         dev_kfree_skb_any(iovb);
833         }
834         if (error >= 15) {
835                 struct sk_buff *sb;
836                 while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
837                         dev_kfree_skb_any(sb);
838                 free_scq(card, card->scq0, NULL);
839         }
840         if (error >= 14) {
841                 struct sk_buff *lb;
842                 while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
843                         dev_kfree_skb_any(lb);
844         }
845         if (error >= 13) {
846                 struct sk_buff *hb;
847                 while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL)
848                         dev_kfree_skb_any(hb);
849         }
850         if (error >= 12) {
851                 kfree(card->rsq.org);
852         }
853         if (error >= 11) {
854                 kfree(card->tsq.org);
855         }
856         if (error >= 10) {
857                 free_irq(card->pcidev->irq, card);
858         }
859         if (error >= 4) {
860                 iounmap(card->membase);
861         }
862         if (error >= 3) {
863                 pci_disable_device(card->pcidev);
864                 kfree(card);
865         }
866 }
867
868 static scq_info *get_scq(ns_dev *card, int size, u32 scd)
869 {
870         scq_info *scq;
871         int i;
872
873         if (size != VBR_SCQSIZE && size != CBR_SCQSIZE)
874                 return NULL;
875
876         scq = kmalloc(sizeof(scq_info), GFP_KERNEL);
877         if (!scq)
878                 return NULL;
879         scq->org = pci_alloc_consistent(card->pcidev, 2 * size, &scq->dma);
880         if (!scq->org) {
881                 kfree(scq);
882                 return NULL;
883         }
884         scq->skb = kmalloc(sizeof(struct sk_buff *) *
885                            (size / NS_SCQE_SIZE), GFP_KERNEL);
886         if (!scq->skb) {
887                 kfree(scq->org);
888                 kfree(scq);
889                 return NULL;
890         }
891         scq->num_entries = size / NS_SCQE_SIZE;
892         scq->base = PTR_ALIGN(scq->org, size);
893         scq->next = scq->base;
894         scq->last = scq->base + (scq->num_entries - 1);
895         scq->tail = scq->last;
896         scq->scd = scd;
897         scq->num_entries = size / NS_SCQE_SIZE;
898         scq->tbd_count = 0;
899         init_waitqueue_head(&scq->scqfull_waitq);
900         scq->full = 0;
901         spin_lock_init(&scq->lock);
902
903         for (i = 0; i < scq->num_entries; i++)
904                 scq->skb[i] = NULL;
905
906         return scq;
907 }
908
909 /* For variable rate SCQ vcc must be NULL */
910 static void free_scq(ns_dev *card, scq_info *scq, struct atm_vcc *vcc)
911 {
912         int i;
913
914         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES)
915                 for (i = 0; i < scq->num_entries; i++) {
916                         if (scq->skb[i] != NULL) {
917                                 vcc = ATM_SKB(scq->skb[i])->vcc;
918                                 if (vcc->pop != NULL)
919                                         vcc->pop(vcc, scq->skb[i]);
920                                 else
921                                         dev_kfree_skb_any(scq->skb[i]);
922                         }
923         } else {                /* vcc must be != NULL */
924
925                 if (vcc == NULL) {
926                         printk
927                             ("nicstar: free_scq() called with vcc == NULL for fixed rate scq.");
928                         for (i = 0; i < scq->num_entries; i++)
929                                 dev_kfree_skb_any(scq->skb[i]);
930                 } else
931                         for (i = 0; i < scq->num_entries; i++) {
932                                 if (scq->skb[i] != NULL) {
933                                         if (vcc->pop != NULL)
934                                                 vcc->pop(vcc, scq->skb[i]);
935                                         else
936                                                 dev_kfree_skb_any(scq->skb[i]);
937                                 }
938                         }
939         }
940         kfree(scq->skb);
941         pci_free_consistent(card->pcidev,
942                             2 * (scq->num_entries == VBR_SCQ_NUM_ENTRIES ?
943                                  VBR_SCQSIZE : CBR_SCQSIZE),
944                             scq->org, scq->dma);
945         kfree(scq);
946 }
947
948 /* The handles passed must be pointers to the sk_buff containing the small
949    or large buffer(s) cast to u32. */
950 static void push_rxbufs(ns_dev * card, struct sk_buff *skb)
951 {
952         struct sk_buff *handle1, *handle2;
953         u32 id1 = 0, id2 = 0;
954         u32 addr1, addr2;
955         u32 stat;
956         unsigned long flags;
957         int err;
958
959         /* *BARF* */
960         handle2 = NULL;
961         addr2 = 0;
962         handle1 = skb;
963         addr1 = pci_map_single(card->pcidev,
964                                skb->data,
965                                (NS_PRV_BUFTYPE(skb) == BUF_SM
966                                 ? NS_SMSKBSIZE : NS_LGSKBSIZE),
967                                PCI_DMA_TODEVICE);
968         NS_PRV_DMA(skb) = addr1; /* save so we can unmap later */
969
970 #ifdef GENERAL_DEBUG
971         if (!addr1)
972                 printk("nicstar%d: push_rxbufs called with addr1 = 0.\n",
973                        card->index);
974 #endif /* GENERAL_DEBUG */
975
976         stat = readl(card->membase + STAT);
977         card->sbfqc = ns_stat_sfbqc_get(stat);
978         card->lbfqc = ns_stat_lfbqc_get(stat);
979         if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
980                 if (!addr2) {
981                         if (card->sm_addr) {
982                                 addr2 = card->sm_addr;
983                                 handle2 = card->sm_handle;
984                                 card->sm_addr = 0x00000000;
985                                 card->sm_handle = 0x00000000;
986                         } else {        /* (!sm_addr) */
987
988                                 card->sm_addr = addr1;
989                                 card->sm_handle = handle1;
990                         }
991                 }
992         } else {                /* buf_type == BUF_LG */
993
994                 if (!addr2) {
995                         if (card->lg_addr) {
996                                 addr2 = card->lg_addr;
997                                 handle2 = card->lg_handle;
998                                 card->lg_addr = 0x00000000;
999                                 card->lg_handle = 0x00000000;
1000                         } else {        /* (!lg_addr) */
1001
1002                                 card->lg_addr = addr1;
1003                                 card->lg_handle = handle1;
1004                         }
1005                 }
1006         }
1007
1008         if (addr2) {
1009                 if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
1010                         if (card->sbfqc >= card->sbnr.max) {
1011                                 skb_unlink(handle1, &card->sbpool.queue);
1012                                 dev_kfree_skb_any(handle1);
1013                                 skb_unlink(handle2, &card->sbpool.queue);
1014                                 dev_kfree_skb_any(handle2);
1015                                 return;
1016                         } else
1017                                 card->sbfqc += 2;
1018                 } else {        /* (buf_type == BUF_LG) */
1019
1020                         if (card->lbfqc >= card->lbnr.max) {
1021                                 skb_unlink(handle1, &card->lbpool.queue);
1022                                 dev_kfree_skb_any(handle1);
1023                                 skb_unlink(handle2, &card->lbpool.queue);
1024                                 dev_kfree_skb_any(handle2);
1025                                 return;
1026                         } else
1027                                 card->lbfqc += 2;
1028                 }
1029
1030                 do {
1031                         if (!idr_pre_get(&card->idr, GFP_ATOMIC)) {
1032                                 printk(KERN_ERR
1033                                        "nicstar%d: no free memory for idr\n",
1034                                        card->index);
1035                                 goto out;
1036                         }
1037
1038                         if (!id1)
1039                                 err = idr_get_new_above(&card->idr, handle1, 0, &id1);
1040
1041                         if (!id2 && err == 0)
1042                                 err = idr_get_new_above(&card->idr, handle2, 0, &id2);
1043
1044                 } while (err == -EAGAIN);
1045
1046                 if (err)
1047                         goto out;
1048
1049                 spin_lock_irqsave(&card->res_lock, flags);
1050                 while (CMD_BUSY(card)) ;
1051                 writel(addr2, card->membase + DR3);
1052                 writel(id2, card->membase + DR2);
1053                 writel(addr1, card->membase + DR1);
1054                 writel(id1, card->membase + DR0);
1055                 writel(NS_CMD_WRITE_FREEBUFQ | NS_PRV_BUFTYPE(skb),
1056                        card->membase + CMD);
1057                 spin_unlock_irqrestore(&card->res_lock, flags);
1058
1059                 XPRINTK("nicstar%d: Pushing %s buffers at 0x%x and 0x%x.\n",
1060                         card->index,
1061                         (NS_PRV_BUFTYPE(skb) == BUF_SM ? "small" : "large"),
1062                         addr1, addr2);
1063         }
1064
1065         if (!card->efbie && card->sbfqc >= card->sbnr.min &&
1066             card->lbfqc >= card->lbnr.min) {
1067                 card->efbie = 1;
1068                 writel((readl(card->membase + CFG) | NS_CFG_EFBIE),
1069                        card->membase + CFG);
1070         }
1071
1072 out:
1073         return;
1074 }
1075
1076 static irqreturn_t ns_irq_handler(int irq, void *dev_id)
1077 {
1078         u32 stat_r;
1079         ns_dev *card;
1080         struct atm_dev *dev;
1081         unsigned long flags;
1082
1083         card = (ns_dev *) dev_id;
1084         dev = card->atmdev;
1085         card->intcnt++;
1086
1087         PRINTK("nicstar%d: NICStAR generated an interrupt\n", card->index);
1088
1089         spin_lock_irqsave(&card->int_lock, flags);
1090
1091         stat_r = readl(card->membase + STAT);
1092
1093         /* Transmit Status Indicator has been written to T. S. Queue */
1094         if (stat_r & NS_STAT_TSIF) {
1095                 TXPRINTK("nicstar%d: TSI interrupt\n", card->index);
1096                 process_tsq(card);
1097                 writel(NS_STAT_TSIF, card->membase + STAT);
1098         }
1099
1100         /* Incomplete CS-PDU has been transmitted */
1101         if (stat_r & NS_STAT_TXICP) {
1102                 writel(NS_STAT_TXICP, card->membase + STAT);
1103                 TXPRINTK("nicstar%d: Incomplete CS-PDU transmitted.\n",
1104                          card->index);
1105         }
1106
1107         /* Transmit Status Queue 7/8 full */
1108         if (stat_r & NS_STAT_TSQF) {
1109                 writel(NS_STAT_TSQF, card->membase + STAT);
1110                 PRINTK("nicstar%d: TSQ full.\n", card->index);
1111                 process_tsq(card);
1112         }
1113
1114         /* Timer overflow */
1115         if (stat_r & NS_STAT_TMROF) {
1116                 writel(NS_STAT_TMROF, card->membase + STAT);
1117                 PRINTK("nicstar%d: Timer overflow.\n", card->index);
1118         }
1119
1120         /* PHY device interrupt signal active */
1121         if (stat_r & NS_STAT_PHYI) {
1122                 writel(NS_STAT_PHYI, card->membase + STAT);
1123                 PRINTK("nicstar%d: PHY interrupt.\n", card->index);
1124                 if (dev->phy && dev->phy->interrupt) {
1125                         dev->phy->interrupt(dev);
1126                 }
1127         }
1128
1129         /* Small Buffer Queue is full */
1130         if (stat_r & NS_STAT_SFBQF) {
1131                 writel(NS_STAT_SFBQF, card->membase + STAT);
1132                 printk("nicstar%d: Small free buffer queue is full.\n",
1133                        card->index);
1134         }
1135
1136         /* Large Buffer Queue is full */
1137         if (stat_r & NS_STAT_LFBQF) {
1138                 writel(NS_STAT_LFBQF, card->membase + STAT);
1139                 printk("nicstar%d: Large free buffer queue is full.\n",
1140                        card->index);
1141         }
1142
1143         /* Receive Status Queue is full */
1144         if (stat_r & NS_STAT_RSQF) {
1145                 writel(NS_STAT_RSQF, card->membase + STAT);
1146                 printk("nicstar%d: RSQ full.\n", card->index);
1147                 process_rsq(card);
1148         }
1149
1150         /* Complete CS-PDU received */
1151         if (stat_r & NS_STAT_EOPDU) {
1152                 RXPRINTK("nicstar%d: End of CS-PDU received.\n", card->index);
1153                 process_rsq(card);
1154                 writel(NS_STAT_EOPDU, card->membase + STAT);
1155         }
1156
1157         /* Raw cell received */
1158         if (stat_r & NS_STAT_RAWCF) {
1159                 writel(NS_STAT_RAWCF, card->membase + STAT);
1160 #ifndef RCQ_SUPPORT
1161                 printk("nicstar%d: Raw cell received and no support yet...\n",
1162                        card->index);
1163 #endif /* RCQ_SUPPORT */
1164                 /* NOTE: the following procedure may keep a raw cell pending until the
1165                    next interrupt. As this preliminary support is only meant to
1166                    avoid buffer leakage, this is not an issue. */
1167                 while (readl(card->membase + RAWCT) != card->rawch) {
1168
1169                         if (ns_rcqe_islast(card->rawcell)) {
1170                                 struct sk_buff *oldbuf;
1171
1172                                 oldbuf = card->rcbuf;
1173                                 card->rcbuf = idr_find(&card->idr,
1174                                                        ns_rcqe_nextbufhandle(card->rawcell));
1175                                 card->rawch = NS_PRV_DMA(card->rcbuf);
1176                                 card->rawcell = (struct ns_rcqe *)
1177                                                 card->rcbuf->data;
1178                                 recycle_rx_buf(card, oldbuf);
1179                         } else {
1180                                 card->rawch += NS_RCQE_SIZE;
1181                                 card->rawcell++;
1182                         }
1183                 }
1184         }
1185
1186         /* Small buffer queue is empty */
1187         if (stat_r & NS_STAT_SFBQE) {
1188                 int i;
1189                 struct sk_buff *sb;
1190
1191                 writel(NS_STAT_SFBQE, card->membase + STAT);
1192                 printk("nicstar%d: Small free buffer queue empty.\n",
1193                        card->index);
1194                 for (i = 0; i < card->sbnr.min; i++) {
1195                         sb = dev_alloc_skb(NS_SMSKBSIZE);
1196                         if (sb == NULL) {
1197                                 writel(readl(card->membase + CFG) &
1198                                        ~NS_CFG_EFBIE, card->membase + CFG);
1199                                 card->efbie = 0;
1200                                 break;
1201                         }
1202                         NS_PRV_BUFTYPE(sb) = BUF_SM;
1203                         skb_queue_tail(&card->sbpool.queue, sb);
1204                         skb_reserve(sb, NS_AAL0_HEADER);
1205                         push_rxbufs(card, sb);
1206                 }
1207                 card->sbfqc = i;
1208                 process_rsq(card);
1209         }
1210
1211         /* Large buffer queue empty */
1212         if (stat_r & NS_STAT_LFBQE) {
1213                 int i;
1214                 struct sk_buff *lb;
1215
1216                 writel(NS_STAT_LFBQE, card->membase + STAT);
1217                 printk("nicstar%d: Large free buffer queue empty.\n",
1218                        card->index);
1219                 for (i = 0; i < card->lbnr.min; i++) {
1220                         lb = dev_alloc_skb(NS_LGSKBSIZE);
1221                         if (lb == NULL) {
1222                                 writel(readl(card->membase + CFG) &
1223                                        ~NS_CFG_EFBIE, card->membase + CFG);
1224                                 card->efbie = 0;
1225                                 break;
1226                         }
1227                         NS_PRV_BUFTYPE(lb) = BUF_LG;
1228                         skb_queue_tail(&card->lbpool.queue, lb);
1229                         skb_reserve(lb, NS_SMBUFSIZE);
1230                         push_rxbufs(card, lb);
1231                 }
1232                 card->lbfqc = i;
1233                 process_rsq(card);
1234         }
1235
1236         /* Receive Status Queue is 7/8 full */
1237         if (stat_r & NS_STAT_RSQAF) {
1238                 writel(NS_STAT_RSQAF, card->membase + STAT);
1239                 RXPRINTK("nicstar%d: RSQ almost full.\n", card->index);
1240                 process_rsq(card);
1241         }
1242
1243         spin_unlock_irqrestore(&card->int_lock, flags);
1244         PRINTK("nicstar%d: end of interrupt service\n", card->index);
1245         return IRQ_HANDLED;
1246 }
1247
1248 static int ns_open(struct atm_vcc *vcc)
1249 {
1250         ns_dev *card;
1251         vc_map *vc;
1252         unsigned long tmpl, modl;
1253         int tcr, tcra;          /* target cell rate, and absolute value */
1254         int n = 0;              /* Number of entries in the TST. Initialized to remove
1255                                    the compiler warning. */
1256         u32 u32d[4];
1257         int frscdi = 0;         /* Index of the SCD. Initialized to remove the compiler
1258                                    warning. How I wish compilers were clever enough to
1259                                    tell which variables can truly be used
1260                                    uninitialized... */
1261         int inuse;              /* tx or rx vc already in use by another vcc */
1262         short vpi = vcc->vpi;
1263         int vci = vcc->vci;
1264
1265         card = (ns_dev *) vcc->dev->dev_data;
1266         PRINTK("nicstar%d: opening vpi.vci %d.%d \n", card->index, (int)vpi,
1267                vci);
1268         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1269                 PRINTK("nicstar%d: unsupported AAL.\n", card->index);
1270                 return -EINVAL;
1271         }
1272
1273         vc = &(card->vcmap[vpi << card->vcibits | vci]);
1274         vcc->dev_data = vc;
1275
1276         inuse = 0;
1277         if (vcc->qos.txtp.traffic_class != ATM_NONE && vc->tx)
1278                 inuse = 1;
1279         if (vcc->qos.rxtp.traffic_class != ATM_NONE && vc->rx)
1280                 inuse += 2;
1281         if (inuse) {
1282                 printk("nicstar%d: %s vci already in use.\n", card->index,
1283                        inuse == 1 ? "tx" : inuse == 2 ? "rx" : "tx and rx");
1284                 return -EINVAL;
1285         }
1286
1287         set_bit(ATM_VF_ADDR, &vcc->flags);
1288
1289         /* NOTE: You are not allowed to modify an open connection's QOS. To change
1290            that, remove the ATM_VF_PARTIAL flag checking. There may be other changes
1291            needed to do that. */
1292         if (!test_bit(ATM_VF_PARTIAL, &vcc->flags)) {
1293                 scq_info *scq;
1294
1295                 set_bit(ATM_VF_PARTIAL, &vcc->flags);
1296                 if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1297                         /* Check requested cell rate and availability of SCD */
1298                         if (vcc->qos.txtp.max_pcr == 0 && vcc->qos.txtp.pcr == 0
1299                             && vcc->qos.txtp.min_pcr == 0) {
1300                                 PRINTK
1301                                     ("nicstar%d: trying to open a CBR vc with cell rate = 0 \n",
1302                                      card->index);
1303                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1304                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1305                                 return -EINVAL;
1306                         }
1307
1308                         tcr = atm_pcr_goal(&(vcc->qos.txtp));
1309                         tcra = tcr >= 0 ? tcr : -tcr;
1310
1311                         PRINTK("nicstar%d: target cell rate = %d.\n",
1312                                card->index, vcc->qos.txtp.max_pcr);
1313
1314                         tmpl =
1315                             (unsigned long)tcra *(unsigned long)
1316                             NS_TST_NUM_ENTRIES;
1317                         modl = tmpl % card->max_pcr;
1318
1319                         n = (int)(tmpl / card->max_pcr);
1320                         if (tcr > 0) {
1321                                 if (modl > 0)
1322                                         n++;
1323                         } else if (tcr == 0) {
1324                                 if ((n =
1325                                      (card->tst_free_entries -
1326                                       NS_TST_RESERVED)) <= 0) {
1327                                         PRINTK
1328                                             ("nicstar%d: no CBR bandwidth free.\n",
1329                                              card->index);
1330                                         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1331                                         clear_bit(ATM_VF_ADDR, &vcc->flags);
1332                                         return -EINVAL;
1333                                 }
1334                         }
1335
1336                         if (n == 0) {
1337                                 printk
1338                                     ("nicstar%d: selected bandwidth < granularity.\n",
1339                                      card->index);
1340                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1341                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1342                                 return -EINVAL;
1343                         }
1344
1345                         if (n > (card->tst_free_entries - NS_TST_RESERVED)) {
1346                                 PRINTK
1347                                     ("nicstar%d: not enough free CBR bandwidth.\n",
1348                                      card->index);
1349                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1350                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1351                                 return -EINVAL;
1352                         } else
1353                                 card->tst_free_entries -= n;
1354
1355                         XPRINTK("nicstar%d: writing %d tst entries.\n",
1356                                 card->index, n);
1357                         for (frscdi = 0; frscdi < NS_FRSCD_NUM; frscdi++) {
1358                                 if (card->scd2vc[frscdi] == NULL) {
1359                                         card->scd2vc[frscdi] = vc;
1360                                         break;
1361                                 }
1362                         }
1363                         if (frscdi == NS_FRSCD_NUM) {
1364                                 PRINTK
1365                                     ("nicstar%d: no SCD available for CBR channel.\n",
1366                                      card->index);
1367                                 card->tst_free_entries += n;
1368                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1369                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1370                                 return -EBUSY;
1371                         }
1372
1373                         vc->cbr_scd = NS_FRSCD + frscdi * NS_FRSCD_SIZE;
1374
1375                         scq = get_scq(card, CBR_SCQSIZE, vc->cbr_scd);
1376                         if (scq == NULL) {
1377                                 PRINTK("nicstar%d: can't get fixed rate SCQ.\n",
1378                                        card->index);
1379                                 card->scd2vc[frscdi] = NULL;
1380                                 card->tst_free_entries += n;
1381                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1382                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1383                                 return -ENOMEM;
1384                         }
1385                         vc->scq = scq;
1386                         u32d[0] = scq_virt_to_bus(scq, scq->base);
1387                         u32d[1] = (u32) 0x00000000;
1388                         u32d[2] = (u32) 0xffffffff;
1389                         u32d[3] = (u32) 0x00000000;
1390                         ns_write_sram(card, vc->cbr_scd, u32d, 4);
1391
1392                         fill_tst(card, n, vc);
1393                 } else if (vcc->qos.txtp.traffic_class == ATM_UBR) {
1394                         vc->cbr_scd = 0x00000000;
1395                         vc->scq = card->scq0;
1396                 }
1397
1398                 if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1399                         vc->tx = 1;
1400                         vc->tx_vcc = vcc;
1401                         vc->tbd_count = 0;
1402                 }
1403                 if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1404                         u32 status;
1405
1406                         vc->rx = 1;
1407                         vc->rx_vcc = vcc;
1408                         vc->rx_iov = NULL;
1409
1410                         /* Open the connection in hardware */
1411                         if (vcc->qos.aal == ATM_AAL5)
1412                                 status = NS_RCTE_AAL5 | NS_RCTE_CONNECTOPEN;
1413                         else    /* vcc->qos.aal == ATM_AAL0 */
1414                                 status = NS_RCTE_AAL0 | NS_RCTE_CONNECTOPEN;
1415 #ifdef RCQ_SUPPORT
1416                         status |= NS_RCTE_RAWCELLINTEN;
1417 #endif /* RCQ_SUPPORT */
1418                         ns_write_sram(card,
1419                                       NS_RCT +
1420                                       (vpi << card->vcibits | vci) *
1421                                       NS_RCT_ENTRY_SIZE, &status, 1);
1422                 }
1423
1424         }
1425
1426         set_bit(ATM_VF_READY, &vcc->flags);
1427         return 0;
1428 }
1429
1430 static void ns_close(struct atm_vcc *vcc)
1431 {
1432         vc_map *vc;
1433         ns_dev *card;
1434         u32 data;
1435         int i;
1436
1437         vc = vcc->dev_data;
1438         card = vcc->dev->dev_data;
1439         PRINTK("nicstar%d: closing vpi.vci %d.%d \n", card->index,
1440                (int)vcc->vpi, vcc->vci);
1441
1442         clear_bit(ATM_VF_READY, &vcc->flags);
1443
1444         if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1445                 u32 addr;
1446                 unsigned long flags;
1447
1448                 addr =
1449                     NS_RCT +
1450                     (vcc->vpi << card->vcibits | vcc->vci) * NS_RCT_ENTRY_SIZE;
1451                 spin_lock_irqsave(&card->res_lock, flags);
1452                 while (CMD_BUSY(card)) ;
1453                 writel(NS_CMD_CLOSE_CONNECTION | addr << 2,
1454                        card->membase + CMD);
1455                 spin_unlock_irqrestore(&card->res_lock, flags);
1456
1457                 vc->rx = 0;
1458                 if (vc->rx_iov != NULL) {
1459                         struct sk_buff *iovb;
1460                         u32 stat;
1461
1462                         stat = readl(card->membase + STAT);
1463                         card->sbfqc = ns_stat_sfbqc_get(stat);
1464                         card->lbfqc = ns_stat_lfbqc_get(stat);
1465
1466                         PRINTK
1467                             ("nicstar%d: closing a VC with pending rx buffers.\n",
1468                              card->index);
1469                         iovb = vc->rx_iov;
1470                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
1471                                               NS_PRV_IOVCNT(iovb));
1472                         NS_PRV_IOVCNT(iovb) = 0;
1473                         spin_lock_irqsave(&card->int_lock, flags);
1474                         recycle_iov_buf(card, iovb);
1475                         spin_unlock_irqrestore(&card->int_lock, flags);
1476                         vc->rx_iov = NULL;
1477                 }
1478         }
1479
1480         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1481                 vc->tx = 0;
1482         }
1483
1484         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1485                 unsigned long flags;
1486                 ns_scqe *scqep;
1487                 scq_info *scq;
1488
1489                 scq = vc->scq;
1490
1491                 for (;;) {
1492                         spin_lock_irqsave(&scq->lock, flags);
1493                         scqep = scq->next;
1494                         if (scqep == scq->base)
1495                                 scqep = scq->last;
1496                         else
1497                                 scqep--;
1498                         if (scqep == scq->tail) {
1499                                 spin_unlock_irqrestore(&scq->lock, flags);
1500                                 break;
1501                         }
1502                         /* If the last entry is not a TSR, place one in the SCQ in order to
1503                            be able to completely drain it and then close. */
1504                         if (!ns_scqe_is_tsr(scqep) && scq->tail != scq->next) {
1505                                 ns_scqe tsr;
1506                                 u32 scdi, scqi;
1507                                 u32 data;
1508                                 int index;
1509
1510                                 tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1511                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1512                                 scqi = scq->next - scq->base;
1513                                 tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1514                                 tsr.word_3 = 0x00000000;
1515                                 tsr.word_4 = 0x00000000;
1516                                 *scq->next = tsr;
1517                                 index = (int)scqi;
1518                                 scq->skb[index] = NULL;
1519                                 if (scq->next == scq->last)
1520                                         scq->next = scq->base;
1521                                 else
1522                                         scq->next++;
1523                                 data = scq_virt_to_bus(scq, scq->next);
1524                                 ns_write_sram(card, scq->scd, &data, 1);
1525                         }
1526                         spin_unlock_irqrestore(&scq->lock, flags);
1527                         schedule();
1528                 }
1529
1530                 /* Free all TST entries */
1531                 data = NS_TST_OPCODE_VARIABLE;
1532                 for (i = 0; i < NS_TST_NUM_ENTRIES; i++) {
1533                         if (card->tste2vc[i] == vc) {
1534                                 ns_write_sram(card, card->tst_addr + i, &data,
1535                                               1);
1536                                 card->tste2vc[i] = NULL;
1537                                 card->tst_free_entries++;
1538                         }
1539                 }
1540
1541                 card->scd2vc[(vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE] = NULL;
1542                 free_scq(card, vc->scq, vcc);
1543         }
1544
1545         /* remove all references to vcc before deleting it */
1546         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1547                 unsigned long flags;
1548                 scq_info *scq = card->scq0;
1549
1550                 spin_lock_irqsave(&scq->lock, flags);
1551
1552                 for (i = 0; i < scq->num_entries; i++) {
1553                         if (scq->skb[i] && ATM_SKB(scq->skb[i])->vcc == vcc) {
1554                                 ATM_SKB(scq->skb[i])->vcc = NULL;
1555                                 atm_return(vcc, scq->skb[i]->truesize);
1556                                 PRINTK
1557                                     ("nicstar: deleted pending vcc mapping\n");
1558                         }
1559                 }
1560
1561                 spin_unlock_irqrestore(&scq->lock, flags);
1562         }
1563
1564         vcc->dev_data = NULL;
1565         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1566         clear_bit(ATM_VF_ADDR, &vcc->flags);
1567
1568 #ifdef RX_DEBUG
1569         {
1570                 u32 stat, cfg;
1571                 stat = readl(card->membase + STAT);
1572                 cfg = readl(card->membase + CFG);
1573                 printk("STAT = 0x%08X  CFG = 0x%08X  \n", stat, cfg);
1574                 printk
1575                     ("TSQ: base = 0x%p  next = 0x%p  last = 0x%p  TSQT = 0x%08X \n",
1576                      card->tsq.base, card->tsq.next,
1577                      card->tsq.last, readl(card->membase + TSQT));
1578                 printk
1579                     ("RSQ: base = 0x%p  next = 0x%p  last = 0x%p  RSQT = 0x%08X \n",
1580                      card->rsq.base, card->rsq.next,
1581                      card->rsq.last, readl(card->membase + RSQT));
1582                 printk("Empty free buffer queue interrupt %s \n",
1583                        card->efbie ? "enabled" : "disabled");
1584                 printk("SBCNT = %d  count = %d   LBCNT = %d count = %d \n",
1585                        ns_stat_sfbqc_get(stat), card->sbpool.count,
1586                        ns_stat_lfbqc_get(stat), card->lbpool.count);
1587                 printk("hbpool.count = %d  iovpool.count = %d \n",
1588                        card->hbpool.count, card->iovpool.count);
1589         }
1590 #endif /* RX_DEBUG */
1591 }
1592
1593 static void fill_tst(ns_dev * card, int n, vc_map * vc)
1594 {
1595         u32 new_tst;
1596         unsigned long cl;
1597         int e, r;
1598         u32 data;
1599
1600         /* It would be very complicated to keep the two TSTs synchronized while
1601            assuring that writes are only made to the inactive TST. So, for now I
1602            will use only one TST. If problems occur, I will change this again */
1603
1604         new_tst = card->tst_addr;
1605
1606         /* Fill procedure */
1607
1608         for (e = 0; e < NS_TST_NUM_ENTRIES; e++) {
1609                 if (card->tste2vc[e] == NULL)
1610                         break;
1611         }
1612         if (e == NS_TST_NUM_ENTRIES) {
1613                 printk("nicstar%d: No free TST entries found. \n", card->index);
1614                 return;
1615         }
1616
1617         r = n;
1618         cl = NS_TST_NUM_ENTRIES;
1619         data = ns_tste_make(NS_TST_OPCODE_FIXED, vc->cbr_scd);
1620
1621         while (r > 0) {
1622                 if (cl >= NS_TST_NUM_ENTRIES && card->tste2vc[e] == NULL) {
1623                         card->tste2vc[e] = vc;
1624                         ns_write_sram(card, new_tst + e, &data, 1);
1625                         cl -= NS_TST_NUM_ENTRIES;
1626                         r--;
1627                 }
1628
1629                 if (++e == NS_TST_NUM_ENTRIES) {
1630                         e = 0;
1631                 }
1632                 cl += n;
1633         }
1634
1635         /* End of fill procedure */
1636
1637         data = ns_tste_make(NS_TST_OPCODE_END, new_tst);
1638         ns_write_sram(card, new_tst + NS_TST_NUM_ENTRIES, &data, 1);
1639         ns_write_sram(card, card->tst_addr + NS_TST_NUM_ENTRIES, &data, 1);
1640         card->tst_addr = new_tst;
1641 }
1642
1643 static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb)
1644 {
1645         ns_dev *card;
1646         vc_map *vc;
1647         scq_info *scq;
1648         unsigned long buflen;
1649         ns_scqe scqe;
1650         u32 flags;              /* TBD flags, not CPU flags */
1651
1652         card = vcc->dev->dev_data;
1653         TXPRINTK("nicstar%d: ns_send() called.\n", card->index);
1654         if ((vc = (vc_map *) vcc->dev_data) == NULL) {
1655                 printk("nicstar%d: vcc->dev_data == NULL on ns_send().\n",
1656                        card->index);
1657                 atomic_inc(&vcc->stats->tx_err);
1658                 dev_kfree_skb_any(skb);
1659                 return -EINVAL;
1660         }
1661
1662         if (!vc->tx) {
1663                 printk("nicstar%d: Trying to transmit on a non-tx VC.\n",
1664                        card->index);
1665                 atomic_inc(&vcc->stats->tx_err);
1666                 dev_kfree_skb_any(skb);
1667                 return -EINVAL;
1668         }
1669
1670         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1671                 printk("nicstar%d: Only AAL0 and AAL5 are supported.\n",
1672                        card->index);
1673                 atomic_inc(&vcc->stats->tx_err);
1674                 dev_kfree_skb_any(skb);
1675                 return -EINVAL;
1676         }
1677
1678         if (skb_shinfo(skb)->nr_frags != 0) {
1679                 printk("nicstar%d: No scatter-gather yet.\n", card->index);
1680                 atomic_inc(&vcc->stats->tx_err);
1681                 dev_kfree_skb_any(skb);
1682                 return -EINVAL;
1683         }
1684
1685         ATM_SKB(skb)->vcc = vcc;
1686
1687         NS_PRV_DMA(skb) = pci_map_single(card->pcidev, skb->data,
1688                                          skb->len, PCI_DMA_TODEVICE);
1689
1690         if (vcc->qos.aal == ATM_AAL5) {
1691                 buflen = (skb->len + 47 + 8) / 48 * 48; /* Multiple of 48 */
1692                 flags = NS_TBD_AAL5;
1693                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb));
1694                 scqe.word_3 = cpu_to_le32(skb->len);
1695                 scqe.word_4 =
1696                     ns_tbd_mkword_4(0, (u32) vcc->vpi, (u32) vcc->vci, 0,
1697                                     ATM_SKB(skb)->
1698                                     atm_options & ATM_ATMOPT_CLP ? 1 : 0);
1699                 flags |= NS_TBD_EOPDU;
1700         } else {                /* (vcc->qos.aal == ATM_AAL0) */
1701
1702                 buflen = ATM_CELL_PAYLOAD;      /* i.e., 48 bytes */
1703                 flags = NS_TBD_AAL0;
1704                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb) + NS_AAL0_HEADER);
1705                 scqe.word_3 = cpu_to_le32(0x00000000);
1706                 if (*skb->data & 0x02)  /* Payload type 1 - end of pdu */
1707                         flags |= NS_TBD_EOPDU;
1708                 scqe.word_4 =
1709                     cpu_to_le32(*((u32 *) skb->data) & ~NS_TBD_VC_MASK);
1710                 /* Force the VPI/VCI to be the same as in VCC struct */
1711                 scqe.word_4 |=
1712                     cpu_to_le32((((u32) vcc->
1713                                   vpi) << NS_TBD_VPI_SHIFT | ((u32) vcc->
1714                                                               vci) <<
1715                                  NS_TBD_VCI_SHIFT) & NS_TBD_VC_MASK);
1716         }
1717
1718         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1719                 scqe.word_1 = ns_tbd_mkword_1_novbr(flags, (u32) buflen);
1720                 scq = ((vc_map *) vcc->dev_data)->scq;
1721         } else {
1722                 scqe.word_1 =
1723                     ns_tbd_mkword_1(flags, (u32) 1, (u32) 1, (u32) buflen);
1724                 scq = card->scq0;
1725         }
1726
1727         if (push_scqe(card, vc, scq, &scqe, skb) != 0) {
1728                 atomic_inc(&vcc->stats->tx_err);
1729                 dev_kfree_skb_any(skb);
1730                 return -EIO;
1731         }
1732         atomic_inc(&vcc->stats->tx);
1733
1734         return 0;
1735 }
1736
1737 static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
1738                      struct sk_buff *skb)
1739 {
1740         unsigned long flags;
1741         ns_scqe tsr;
1742         u32 scdi, scqi;
1743         int scq_is_vbr;
1744         u32 data;
1745         int index;
1746
1747         spin_lock_irqsave(&scq->lock, flags);
1748         while (scq->tail == scq->next) {
1749                 if (in_interrupt()) {
1750                         spin_unlock_irqrestore(&scq->lock, flags);
1751                         printk("nicstar%d: Error pushing TBD.\n", card->index);
1752                         return 1;
1753                 }
1754
1755                 scq->full = 1;
1756                 spin_unlock_irqrestore(&scq->lock, flags);
1757                 interruptible_sleep_on_timeout(&scq->scqfull_waitq,
1758                                                SCQFULL_TIMEOUT);
1759                 spin_lock_irqsave(&scq->lock, flags);
1760
1761                 if (scq->full) {
1762                         spin_unlock_irqrestore(&scq->lock, flags);
1763                         printk("nicstar%d: Timeout pushing TBD.\n",
1764                                card->index);
1765                         return 1;
1766                 }
1767         }
1768         *scq->next = *tbd;
1769         index = (int)(scq->next - scq->base);
1770         scq->skb[index] = skb;
1771         XPRINTK("nicstar%d: sending skb at 0x%p (pos %d).\n",
1772                 card->index, skb, index);
1773         XPRINTK("nicstar%d: TBD written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1774                 card->index, le32_to_cpu(tbd->word_1), le32_to_cpu(tbd->word_2),
1775                 le32_to_cpu(tbd->word_3), le32_to_cpu(tbd->word_4),
1776                 scq->next);
1777         if (scq->next == scq->last)
1778                 scq->next = scq->base;
1779         else
1780                 scq->next++;
1781
1782         vc->tbd_count++;
1783         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES) {
1784                 scq->tbd_count++;
1785                 scq_is_vbr = 1;
1786         } else
1787                 scq_is_vbr = 0;
1788
1789         if (vc->tbd_count >= MAX_TBD_PER_VC
1790             || scq->tbd_count >= MAX_TBD_PER_SCQ) {
1791                 int has_run = 0;
1792
1793                 while (scq->tail == scq->next) {
1794                         if (in_interrupt()) {
1795                                 data = scq_virt_to_bus(scq, scq->next);
1796                                 ns_write_sram(card, scq->scd, &data, 1);
1797                                 spin_unlock_irqrestore(&scq->lock, flags);
1798                                 printk("nicstar%d: Error pushing TSR.\n",
1799                                        card->index);
1800                                 return 0;
1801                         }
1802
1803                         scq->full = 1;
1804                         if (has_run++)
1805                                 break;
1806                         spin_unlock_irqrestore(&scq->lock, flags);
1807                         interruptible_sleep_on_timeout(&scq->scqfull_waitq,
1808                                                        SCQFULL_TIMEOUT);
1809                         spin_lock_irqsave(&scq->lock, flags);
1810                 }
1811
1812                 if (!scq->full) {
1813                         tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1814                         if (scq_is_vbr)
1815                                 scdi = NS_TSR_SCDISVBR;
1816                         else
1817                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1818                         scqi = scq->next - scq->base;
1819                         tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1820                         tsr.word_3 = 0x00000000;
1821                         tsr.word_4 = 0x00000000;
1822
1823                         *scq->next = tsr;
1824                         index = (int)scqi;
1825                         scq->skb[index] = NULL;
1826                         XPRINTK
1827                             ("nicstar%d: TSR written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1828                              card->index, le32_to_cpu(tsr.word_1),
1829                              le32_to_cpu(tsr.word_2), le32_to_cpu(tsr.word_3),
1830                              le32_to_cpu(tsr.word_4), scq->next);
1831                         if (scq->next == scq->last)
1832                                 scq->next = scq->base;
1833                         else
1834                                 scq->next++;
1835                         vc->tbd_count = 0;
1836                         scq->tbd_count = 0;
1837                 } else
1838                         PRINTK("nicstar%d: Timeout pushing TSR.\n",
1839                                card->index);
1840         }
1841         data = scq_virt_to_bus(scq, scq->next);
1842         ns_write_sram(card, scq->scd, &data, 1);
1843
1844         spin_unlock_irqrestore(&scq->lock, flags);
1845
1846         return 0;
1847 }
1848
1849 static void process_tsq(ns_dev * card)
1850 {
1851         u32 scdi;
1852         scq_info *scq;
1853         ns_tsi *previous = NULL, *one_ahead, *two_ahead;
1854         int serviced_entries;   /* flag indicating at least on entry was serviced */
1855
1856         serviced_entries = 0;
1857
1858         if (card->tsq.next == card->tsq.last)
1859                 one_ahead = card->tsq.base;
1860         else
1861                 one_ahead = card->tsq.next + 1;
1862
1863         if (one_ahead == card->tsq.last)
1864                 two_ahead = card->tsq.base;
1865         else
1866                 two_ahead = one_ahead + 1;
1867
1868         while (!ns_tsi_isempty(card->tsq.next) || !ns_tsi_isempty(one_ahead) ||
1869                !ns_tsi_isempty(two_ahead))
1870                 /* At most two empty, as stated in the 77201 errata */
1871         {
1872                 serviced_entries = 1;
1873
1874                 /* Skip the one or two possible empty entries */
1875                 while (ns_tsi_isempty(card->tsq.next)) {
1876                         if (card->tsq.next == card->tsq.last)
1877                                 card->tsq.next = card->tsq.base;
1878                         else
1879                                 card->tsq.next++;
1880                 }
1881
1882                 if (!ns_tsi_tmrof(card->tsq.next)) {
1883                         scdi = ns_tsi_getscdindex(card->tsq.next);
1884                         if (scdi == NS_TSI_SCDISVBR)
1885                                 scq = card->scq0;
1886                         else {
1887                                 if (card->scd2vc[scdi] == NULL) {
1888                                         printk
1889                                             ("nicstar%d: could not find VC from SCD index.\n",
1890                                              card->index);
1891                                         ns_tsi_init(card->tsq.next);
1892                                         return;
1893                                 }
1894                                 scq = card->scd2vc[scdi]->scq;
1895                         }
1896                         drain_scq(card, scq, ns_tsi_getscqpos(card->tsq.next));
1897                         scq->full = 0;
1898                         wake_up_interruptible(&(scq->scqfull_waitq));
1899                 }
1900
1901                 ns_tsi_init(card->tsq.next);
1902                 previous = card->tsq.next;
1903                 if (card->tsq.next == card->tsq.last)
1904                         card->tsq.next = card->tsq.base;
1905                 else
1906                         card->tsq.next++;
1907
1908                 if (card->tsq.next == card->tsq.last)
1909                         one_ahead = card->tsq.base;
1910                 else
1911                         one_ahead = card->tsq.next + 1;
1912
1913                 if (one_ahead == card->tsq.last)
1914                         two_ahead = card->tsq.base;
1915                 else
1916                         two_ahead = one_ahead + 1;
1917         }
1918
1919         if (serviced_entries)
1920                 writel(PTR_DIFF(previous, card->tsq.base),
1921                        card->membase + TSQH);
1922 }
1923
1924 static void drain_scq(ns_dev * card, scq_info * scq, int pos)
1925 {
1926         struct atm_vcc *vcc;
1927         struct sk_buff *skb;
1928         int i;
1929         unsigned long flags;
1930
1931         XPRINTK("nicstar%d: drain_scq() called, scq at 0x%p, pos %d.\n",
1932                 card->index, scq, pos);
1933         if (pos >= scq->num_entries) {
1934                 printk("nicstar%d: Bad index on drain_scq().\n", card->index);
1935                 return;
1936         }
1937
1938         spin_lock_irqsave(&scq->lock, flags);
1939         i = (int)(scq->tail - scq->base);
1940         if (++i == scq->num_entries)
1941                 i = 0;
1942         while (i != pos) {
1943                 skb = scq->skb[i];
1944                 XPRINTK("nicstar%d: freeing skb at 0x%p (index %d).\n",
1945                         card->index, skb, i);
1946                 if (skb != NULL) {
1947                         pci_unmap_single(card->pcidev,
1948                                          NS_PRV_DMA(skb),
1949                                          skb->len,
1950                                          PCI_DMA_TODEVICE);
1951                         vcc = ATM_SKB(skb)->vcc;
1952                         if (vcc && vcc->pop != NULL) {
1953                                 vcc->pop(vcc, skb);
1954                         } else {
1955                                 dev_kfree_skb_irq(skb);
1956                         }
1957                         scq->skb[i] = NULL;
1958                 }
1959                 if (++i == scq->num_entries)
1960                         i = 0;
1961         }
1962         scq->tail = scq->base + pos;
1963         spin_unlock_irqrestore(&scq->lock, flags);
1964 }
1965
1966 static void process_rsq(ns_dev * card)
1967 {
1968         ns_rsqe *previous;
1969
1970         if (!ns_rsqe_valid(card->rsq.next))
1971                 return;
1972         do {
1973                 dequeue_rx(card, card->rsq.next);
1974                 ns_rsqe_init(card->rsq.next);
1975                 previous = card->rsq.next;
1976                 if (card->rsq.next == card->rsq.last)
1977                         card->rsq.next = card->rsq.base;
1978                 else
1979                         card->rsq.next++;
1980         } while (ns_rsqe_valid(card->rsq.next));
1981         writel(PTR_DIFF(previous, card->rsq.base), card->membase + RSQH);
1982 }
1983
1984 static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe)
1985 {
1986         u32 vpi, vci;
1987         vc_map *vc;
1988         struct sk_buff *iovb;
1989         struct iovec *iov;
1990         struct atm_vcc *vcc;
1991         struct sk_buff *skb;
1992         unsigned short aal5_len;
1993         int len;
1994         u32 stat;
1995         u32 id;
1996
1997         stat = readl(card->membase + STAT);
1998         card->sbfqc = ns_stat_sfbqc_get(stat);
1999         card->lbfqc = ns_stat_lfbqc_get(stat);
2000
2001         id = le32_to_cpu(rsqe->buffer_handle);
2002         skb = idr_find(&card->idr, id);
2003         if (!skb) {
2004                 RXPRINTK(KERN_ERR
2005                          "nicstar%d: idr_find() failed!\n", card->index);
2006                 return;
2007         }
2008         idr_remove(&card->idr, id);
2009         pci_dma_sync_single_for_cpu(card->pcidev,
2010                                     NS_PRV_DMA(skb),
2011                                     (NS_PRV_BUFTYPE(skb) == BUF_SM
2012                                      ? NS_SMSKBSIZE : NS_LGSKBSIZE),
2013                                     PCI_DMA_FROMDEVICE);
2014         pci_unmap_single(card->pcidev,
2015                          NS_PRV_DMA(skb),
2016                          (NS_PRV_BUFTYPE(skb) == BUF_SM
2017                           ? NS_SMSKBSIZE : NS_LGSKBSIZE),
2018                          PCI_DMA_FROMDEVICE);
2019         vpi = ns_rsqe_vpi(rsqe);
2020         vci = ns_rsqe_vci(rsqe);
2021         if (vpi >= 1UL << card->vpibits || vci >= 1UL << card->vcibits) {
2022                 printk("nicstar%d: SDU received for out-of-range vc %d.%d.\n",
2023                        card->index, vpi, vci);
2024                 recycle_rx_buf(card, skb);
2025                 return;
2026         }
2027
2028         vc = &(card->vcmap[vpi << card->vcibits | vci]);
2029         if (!vc->rx) {
2030                 RXPRINTK("nicstar%d: SDU received on non-rx vc %d.%d.\n",
2031                          card->index, vpi, vci);
2032                 recycle_rx_buf(card, skb);
2033                 return;
2034         }
2035
2036         vcc = vc->rx_vcc;
2037
2038         if (vcc->qos.aal == ATM_AAL0) {
2039                 struct sk_buff *sb;
2040                 unsigned char *cell;
2041                 int i;
2042
2043                 cell = skb->data;
2044                 for (i = ns_rsqe_cellcount(rsqe); i; i--) {
2045                         if ((sb = dev_alloc_skb(NS_SMSKBSIZE)) == NULL) {
2046                                 printk
2047                                     ("nicstar%d: Can't allocate buffers for aal0.\n",
2048                                      card->index);
2049                                 atomic_add(i, &vcc->stats->rx_drop);
2050                                 break;
2051                         }
2052                         if (!atm_charge(vcc, sb->truesize)) {
2053                                 RXPRINTK
2054                                     ("nicstar%d: atm_charge() dropped aal0 packets.\n",
2055                                      card->index);
2056                                 atomic_add(i - 1, &vcc->stats->rx_drop);        /* already increased by 1 */
2057                                 dev_kfree_skb_any(sb);
2058                                 break;
2059                         }
2060                         /* Rebuild the header */
2061                         *((u32 *) sb->data) = le32_to_cpu(rsqe->word_1) << 4 |
2062                             (ns_rsqe_clp(rsqe) ? 0x00000001 : 0x00000000);
2063                         if (i == 1 && ns_rsqe_eopdu(rsqe))
2064                                 *((u32 *) sb->data) |= 0x00000002;
2065                         skb_put(sb, NS_AAL0_HEADER);
2066                         memcpy(skb_tail_pointer(sb), cell, ATM_CELL_PAYLOAD);
2067                         skb_put(sb, ATM_CELL_PAYLOAD);
2068                         ATM_SKB(sb)->vcc = vcc;
2069                         __net_timestamp(sb);
2070                         vcc->push(vcc, sb);
2071                         atomic_inc(&vcc->stats->rx);
2072                         cell += ATM_CELL_PAYLOAD;
2073                 }
2074
2075                 recycle_rx_buf(card, skb);
2076                 return;
2077         }
2078
2079         /* To reach this point, the AAL layer can only be AAL5 */
2080
2081         if ((iovb = vc->rx_iov) == NULL) {
2082                 iovb = skb_dequeue(&(card->iovpool.queue));
2083                 if (iovb == NULL) {     /* No buffers in the queue */
2084                         iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC);
2085                         if (iovb == NULL) {
2086                                 printk("nicstar%d: Out of iovec buffers.\n",
2087                                        card->index);
2088                                 atomic_inc(&vcc->stats->rx_drop);
2089                                 recycle_rx_buf(card, skb);
2090                                 return;
2091                         }
2092                         NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2093                 } else if (--card->iovpool.count < card->iovnr.min) {
2094                         struct sk_buff *new_iovb;
2095                         if ((new_iovb =
2096                              alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC)) != NULL) {
2097                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2098                                 skb_queue_tail(&card->iovpool.queue, new_iovb);
2099                                 card->iovpool.count++;
2100                         }
2101                 }
2102                 vc->rx_iov = iovb;
2103                 NS_PRV_IOVCNT(iovb) = 0;
2104                 iovb->len = 0;
2105                 iovb->data = iovb->head;
2106                 skb_reset_tail_pointer(iovb);
2107                 /* IMPORTANT: a pointer to the sk_buff containing the small or large
2108                    buffer is stored as iovec base, NOT a pointer to the
2109                    small or large buffer itself. */
2110         } else if (NS_PRV_IOVCNT(iovb) >= NS_MAX_IOVECS) {
2111                 printk("nicstar%d: received too big AAL5 SDU.\n", card->index);
2112                 atomic_inc(&vcc->stats->rx_err);
2113                 recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2114                                       NS_MAX_IOVECS);
2115                 NS_PRV_IOVCNT(iovb) = 0;
2116                 iovb->len = 0;
2117                 iovb->data = iovb->head;
2118                 skb_reset_tail_pointer(iovb);
2119         }
2120         iov = &((struct iovec *)iovb->data)[NS_PRV_IOVCNT(iovb)++];
2121         iov->iov_base = (void *)skb;
2122         iov->iov_len = ns_rsqe_cellcount(rsqe) * 48;
2123         iovb->len += iov->iov_len;
2124
2125 #ifdef EXTRA_DEBUG
2126         if (NS_PRV_IOVCNT(iovb) == 1) {
2127                 if (NS_PRV_BUFTYPE(skb) != BUF_SM) {
2128                         printk
2129                             ("nicstar%d: Expected a small buffer, and this is not one.\n",
2130                              card->index);
2131                         which_list(card, skb);
2132                         atomic_inc(&vcc->stats->rx_err);
2133                         recycle_rx_buf(card, skb);
2134                         vc->rx_iov = NULL;
2135                         recycle_iov_buf(card, iovb);
2136                         return;
2137                 }
2138         } else {                /* NS_PRV_IOVCNT(iovb) >= 2 */
2139
2140                 if (NS_PRV_BUFTYPE(skb) != BUF_LG) {
2141                         printk
2142                             ("nicstar%d: Expected a large buffer, and this is not one.\n",
2143                              card->index);
2144                         which_list(card, skb);
2145                         atomic_inc(&vcc->stats->rx_err);
2146                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2147                                               NS_PRV_IOVCNT(iovb));
2148                         vc->rx_iov = NULL;
2149                         recycle_iov_buf(card, iovb);
2150                         return;
2151                 }
2152         }
2153 #endif /* EXTRA_DEBUG */
2154
2155         if (ns_rsqe_eopdu(rsqe)) {
2156                 /* This works correctly regardless of the endianness of the host */
2157                 unsigned char *L1L2 = (unsigned char *)
2158                                                 (skb->data + iov->iov_len - 6);
2159                 aal5_len = L1L2[0] << 8 | L1L2[1];
2160                 len = (aal5_len == 0x0000) ? 0x10000 : aal5_len;
2161                 if (ns_rsqe_crcerr(rsqe) ||
2162                     len + 8 > iovb->len || len + (47 + 8) < iovb->len) {
2163                         printk("nicstar%d: AAL5 CRC error", card->index);
2164                         if (len + 8 > iovb->len || len + (47 + 8) < iovb->len)
2165                                 printk(" - PDU size mismatch.\n");
2166                         else
2167                                 printk(".\n");
2168                         atomic_inc(&vcc->stats->rx_err);
2169                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2170                                               NS_PRV_IOVCNT(iovb));
2171                         vc->rx_iov = NULL;
2172                         recycle_iov_buf(card, iovb);
2173                         return;
2174                 }
2175
2176                 /* By this point we (hopefully) have a complete SDU without errors. */
2177
2178                 if (NS_PRV_IOVCNT(iovb) == 1) { /* Just a small buffer */
2179                         /* skb points to a small buffer */
2180                         if (!atm_charge(vcc, skb->truesize)) {
2181                                 push_rxbufs(card, skb);
2182                                 atomic_inc(&vcc->stats->rx_drop);
2183                         } else {
2184                                 skb_put(skb, len);
2185                                 dequeue_sm_buf(card, skb);
2186 #ifdef NS_USE_DESTRUCTORS
2187                                 skb->destructor = ns_sb_destructor;
2188 #endif /* NS_USE_DESTRUCTORS */
2189                                 ATM_SKB(skb)->vcc = vcc;
2190                                 __net_timestamp(skb);
2191                                 vcc->push(vcc, skb);
2192                                 atomic_inc(&vcc->stats->rx);
2193                         }
2194                 } else if (NS_PRV_IOVCNT(iovb) == 2) {  /* One small plus one large buffer */
2195                         struct sk_buff *sb;
2196
2197                         sb = (struct sk_buff *)(iov - 1)->iov_base;
2198                         /* skb points to a large buffer */
2199
2200                         if (len <= NS_SMBUFSIZE) {
2201                                 if (!atm_charge(vcc, sb->truesize)) {
2202                                         push_rxbufs(card, sb);
2203                                         atomic_inc(&vcc->stats->rx_drop);
2204                                 } else {
2205                                         skb_put(sb, len);
2206                                         dequeue_sm_buf(card, sb);
2207 #ifdef NS_USE_DESTRUCTORS
2208                                         sb->destructor = ns_sb_destructor;
2209 #endif /* NS_USE_DESTRUCTORS */
2210                                         ATM_SKB(sb)->vcc = vcc;
2211                                         __net_timestamp(sb);
2212                                         vcc->push(vcc, sb);
2213                                         atomic_inc(&vcc->stats->rx);
2214                                 }
2215
2216                                 push_rxbufs(card, skb);
2217
2218                         } else {        /* len > NS_SMBUFSIZE, the usual case */
2219
2220                                 if (!atm_charge(vcc, skb->truesize)) {
2221                                         push_rxbufs(card, skb);
2222                                         atomic_inc(&vcc->stats->rx_drop);
2223                                 } else {
2224                                         dequeue_lg_buf(card, skb);
2225 #ifdef NS_USE_DESTRUCTORS
2226                                         skb->destructor = ns_lb_destructor;
2227 #endif /* NS_USE_DESTRUCTORS */
2228                                         skb_push(skb, NS_SMBUFSIZE);
2229                                         skb_copy_from_linear_data(sb, skb->data,
2230                                                                   NS_SMBUFSIZE);
2231                                         skb_put(skb, len - NS_SMBUFSIZE);
2232                                         ATM_SKB(skb)->vcc = vcc;
2233                                         __net_timestamp(skb);
2234                                         vcc->push(vcc, skb);
2235                                         atomic_inc(&vcc->stats->rx);
2236                                 }
2237
2238                                 push_rxbufs(card, sb);
2239
2240                         }
2241
2242                 } else {        /* Must push a huge buffer */
2243
2244                         struct sk_buff *hb, *sb, *lb;
2245                         int remaining, tocopy;
2246                         int j;
2247
2248                         hb = skb_dequeue(&(card->hbpool.queue));
2249                         if (hb == NULL) {       /* No buffers in the queue */
2250
2251                                 hb = dev_alloc_skb(NS_HBUFSIZE);
2252                                 if (hb == NULL) {
2253                                         printk
2254                                             ("nicstar%d: Out of huge buffers.\n",
2255                                              card->index);
2256                                         atomic_inc(&vcc->stats->rx_drop);
2257                                         recycle_iovec_rx_bufs(card,
2258                                                               (struct iovec *)
2259                                                               iovb->data,
2260                                                               NS_PRV_IOVCNT(iovb));
2261                                         vc->rx_iov = NULL;
2262                                         recycle_iov_buf(card, iovb);
2263                                         return;
2264                                 } else if (card->hbpool.count < card->hbnr.min) {
2265                                         struct sk_buff *new_hb;
2266                                         if ((new_hb =
2267                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2268                                             NULL) {
2269                                                 skb_queue_tail(&card->hbpool.
2270                                                                queue, new_hb);
2271                                                 card->hbpool.count++;
2272                                         }
2273                                 }
2274                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2275                         } else if (--card->hbpool.count < card->hbnr.min) {
2276                                 struct sk_buff *new_hb;
2277                                 if ((new_hb =
2278                                      dev_alloc_skb(NS_HBUFSIZE)) != NULL) {
2279                                         NS_PRV_BUFTYPE(new_hb) = BUF_NONE;
2280                                         skb_queue_tail(&card->hbpool.queue,
2281                                                        new_hb);
2282                                         card->hbpool.count++;
2283                                 }
2284                                 if (card->hbpool.count < card->hbnr.min) {
2285                                         if ((new_hb =
2286                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2287                                             NULL) {
2288                                                 NS_PRV_BUFTYPE(new_hb) =
2289                                                     BUF_NONE;
2290                                                 skb_queue_tail(&card->hbpool.
2291                                                                queue, new_hb);
2292                                                 card->hbpool.count++;
2293                                         }
2294                                 }
2295                         }
2296
2297                         iov = (struct iovec *)iovb->data;
2298
2299                         if (!atm_charge(vcc, hb->truesize)) {
2300                                 recycle_iovec_rx_bufs(card, iov,
2301                                                       NS_PRV_IOVCNT(iovb));
2302                                 if (card->hbpool.count < card->hbnr.max) {
2303                                         skb_queue_tail(&card->hbpool.queue, hb);
2304                                         card->hbpool.count++;
2305                                 } else
2306                                         dev_kfree_skb_any(hb);
2307                                 atomic_inc(&vcc->stats->rx_drop);
2308                         } else {
2309                                 /* Copy the small buffer to the huge buffer */
2310                                 sb = (struct sk_buff *)iov->iov_base;
2311                                 skb_copy_from_linear_data(sb, hb->data,
2312                                                           iov->iov_len);
2313                                 skb_put(hb, iov->iov_len);
2314                                 remaining = len - iov->iov_len;
2315                                 iov++;
2316                                 /* Free the small buffer */
2317                                 push_rxbufs(card, sb);
2318
2319                                 /* Copy all large buffers to the huge buffer and free them */
2320                                 for (j = 1; j < NS_PRV_IOVCNT(iovb); j++) {
2321                                         lb = (struct sk_buff *)iov->iov_base;
2322                                         tocopy =
2323                                             min_t(int, remaining, iov->iov_len);
2324                                         skb_copy_from_linear_data(lb,
2325                                                                   skb_tail_pointer
2326                                                                   (hb), tocopy);
2327                                         skb_put(hb, tocopy);
2328                                         iov++;
2329                                         remaining -= tocopy;
2330                                         push_rxbufs(card, lb);
2331                                 }
2332 #ifdef EXTRA_DEBUG
2333                                 if (remaining != 0 || hb->len != len)
2334                                         printk
2335                                             ("nicstar%d: Huge buffer len mismatch.\n",
2336                                              card->index);
2337 #endif /* EXTRA_DEBUG */
2338                                 ATM_SKB(hb)->vcc = vcc;
2339 #ifdef NS_USE_DESTRUCTORS
2340                                 hb->destructor = ns_hb_destructor;
2341 #endif /* NS_USE_DESTRUCTORS */
2342                                 __net_timestamp(hb);
2343                                 vcc->push(vcc, hb);
2344                                 atomic_inc(&vcc->stats->rx);
2345                         }
2346                 }
2347
2348                 vc->rx_iov = NULL;
2349                 recycle_iov_buf(card, iovb);
2350         }
2351
2352 }
2353
2354 #ifdef NS_USE_DESTRUCTORS
2355
2356 static void ns_sb_destructor(struct sk_buff *sb)
2357 {
2358         ns_dev *card;
2359         u32 stat;
2360
2361         card = (ns_dev *) ATM_SKB(sb)->vcc->dev->dev_data;
2362         stat = readl(card->membase + STAT);
2363         card->sbfqc = ns_stat_sfbqc_get(stat);
2364         card->lbfqc = ns_stat_lfbqc_get(stat);
2365
2366         do {
2367                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
2368                 if (sb == NULL)
2369                         break;
2370                 NS_PRV_BUFTYPE(sb) = BUF_SM;
2371                 skb_queue_tail(&card->sbpool.queue, sb);
2372                 skb_reserve(sb, NS_AAL0_HEADER);
2373                 push_rxbufs(card, sb);
2374         } while (card->sbfqc < card->sbnr.min);
2375 }
2376
2377 static void ns_lb_destructor(struct sk_buff *lb)
2378 {
2379         ns_dev *card;
2380         u32 stat;
2381
2382         card = (ns_dev *) ATM_SKB(lb)->vcc->dev->dev_data;
2383         stat = readl(card->membase + STAT);
2384         card->sbfqc = ns_stat_sfbqc_get(stat);
2385         card->lbfqc = ns_stat_lfbqc_get(stat);
2386
2387         do {
2388                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
2389                 if (lb == NULL)
2390                         break;
2391                 NS_PRV_BUFTYPE(lb) = BUF_LG;
2392                 skb_queue_tail(&card->lbpool.queue, lb);
2393                 skb_reserve(lb, NS_SMBUFSIZE);
2394                 push_rxbufs(card, lb);
2395         } while (card->lbfqc < card->lbnr.min);
2396 }
2397
2398 static void ns_hb_destructor(struct sk_buff *hb)
2399 {
2400         ns_dev *card;
2401
2402         card = (ns_dev *) ATM_SKB(hb)->vcc->dev->dev_data;
2403
2404         while (card->hbpool.count < card->hbnr.init) {
2405                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
2406                 if (hb == NULL)
2407                         break;
2408                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2409                 skb_queue_tail(&card->hbpool.queue, hb);
2410                 card->hbpool.count++;
2411         }
2412 }
2413
2414 #endif /* NS_USE_DESTRUCTORS */
2415
2416 static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb)
2417 {
2418         if (unlikely(NS_PRV_BUFTYPE(skb) == BUF_NONE)) {
2419                 printk("nicstar%d: What kind of rx buffer is this?\n",
2420                        card->index);
2421                 dev_kfree_skb_any(skb);
2422         } else
2423                 push_rxbufs(card, skb);
2424 }
2425
2426 static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count)
2427 {
2428         while (count-- > 0)
2429                 recycle_rx_buf(card, (struct sk_buff *)(iov++)->iov_base);
2430 }
2431
2432 static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb)
2433 {
2434         if (card->iovpool.count < card->iovnr.max) {
2435                 skb_queue_tail(&card->iovpool.queue, iovb);
2436                 card->iovpool.count++;
2437         } else
2438                 dev_kfree_skb_any(iovb);
2439 }
2440
2441 static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb)
2442 {
2443         skb_unlink(sb, &card->sbpool.queue);
2444 #ifdef NS_USE_DESTRUCTORS
2445         if (card->sbfqc < card->sbnr.min)
2446 #else
2447         if (card->sbfqc < card->sbnr.init) {
2448                 struct sk_buff *new_sb;
2449                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2450                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2451                         skb_queue_tail(&card->sbpool.queue, new_sb);
2452                         skb_reserve(new_sb, NS_AAL0_HEADER);
2453                         push_rxbufs(card, new_sb);
2454                 }
2455         }
2456         if (card->sbfqc < card->sbnr.init)
2457 #endif /* NS_USE_DESTRUCTORS */
2458         {
2459                 struct sk_buff *new_sb;
2460                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2461                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2462                         skb_queue_tail(&card->sbpool.queue, new_sb);
2463                         skb_reserve(new_sb, NS_AAL0_HEADER);
2464                         push_rxbufs(card, new_sb);
2465                 }
2466         }
2467 }
2468
2469 static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb)
2470 {
2471         skb_unlink(lb, &card->lbpool.queue);
2472 #ifdef NS_USE_DESTRUCTORS
2473         if (card->lbfqc < card->lbnr.min)
2474 #else
2475         if (card->lbfqc < card->lbnr.init) {
2476                 struct sk_buff *new_lb;
2477                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2478                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2479                         skb_queue_tail(&card->lbpool.queue, new_lb);
2480                         skb_reserve(new_lb, NS_SMBUFSIZE);
2481                         push_rxbufs(card, new_lb);
2482                 }
2483         }
2484         if (card->lbfqc < card->lbnr.init)
2485 #endif /* NS_USE_DESTRUCTORS */
2486         {
2487                 struct sk_buff *new_lb;
2488                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2489                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2490                         skb_queue_tail(&card->lbpool.queue, new_lb);
2491                         skb_reserve(new_lb, NS_SMBUFSIZE);
2492                         push_rxbufs(card, new_lb);
2493                 }
2494         }
2495 }
2496
2497 static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page)
2498 {
2499         u32 stat;
2500         ns_dev *card;
2501         int left;
2502
2503         left = (int)*pos;
2504         card = (ns_dev *) dev->dev_data;
2505         stat = readl(card->membase + STAT);
2506         if (!left--)
2507                 return sprintf(page, "Pool   count    min   init    max \n");
2508         if (!left--)
2509                 return sprintf(page, "Small  %5d  %5d  %5d  %5d \n",
2510                                ns_stat_sfbqc_get(stat), card->sbnr.min,
2511                                card->sbnr.init, card->sbnr.max);
2512         if (!left--)
2513                 return sprintf(page, "Large  %5d  %5d  %5d  %5d \n",
2514                                ns_stat_lfbqc_get(stat), card->lbnr.min,
2515                                card->lbnr.init, card->lbnr.max);
2516         if (!left--)
2517                 return sprintf(page, "Huge   %5d  %5d  %5d  %5d \n",
2518                                card->hbpool.count, card->hbnr.min,
2519                                card->hbnr.init, card->hbnr.max);
2520         if (!left--)
2521                 return sprintf(page, "Iovec  %5d  %5d  %5d  %5d \n",
2522                                card->iovpool.count, card->iovnr.min,
2523                                card->iovnr.init, card->iovnr.max);
2524         if (!left--) {
2525                 int retval;
2526                 retval =
2527                     sprintf(page, "Interrupt counter: %u \n", card->intcnt);
2528                 card->intcnt = 0;
2529                 return retval;
2530         }
2531 #if 0
2532         /* Dump 25.6 Mbps PHY registers */
2533         /* Now there's a 25.6 Mbps PHY driver this code isn't needed. I left it
2534            here just in case it's needed for debugging. */
2535         if (card->max_pcr == ATM_25_PCR && !left--) {
2536                 u32 phy_regs[4];
2537                 u32 i;
2538
2539                 for (i = 0; i < 4; i++) {
2540                         while (CMD_BUSY(card)) ;
2541                         writel(NS_CMD_READ_UTILITY | 0x00000200 | i,
2542                                card->membase + CMD);
2543                         while (CMD_BUSY(card)) ;
2544                         phy_regs[i] = readl(card->membase + DR0) & 0x000000FF;
2545                 }
2546
2547                 return sprintf(page, "PHY regs: 0x%02X 0x%02X 0x%02X 0x%02X \n",
2548                                phy_regs[0], phy_regs[1], phy_regs[2],
2549                                phy_regs[3]);
2550         }
2551 #endif /* 0 - Dump 25.6 Mbps PHY registers */
2552 #if 0
2553         /* Dump TST */
2554         if (left-- < NS_TST_NUM_ENTRIES) {
2555                 if (card->tste2vc[left + 1] == NULL)
2556                         return sprintf(page, "%5d - VBR/UBR \n", left + 1);
2557                 else
2558                         return sprintf(page, "%5d - %d %d \n", left + 1,
2559                                        card->tste2vc[left + 1]->tx_vcc->vpi,
2560                                        card->tste2vc[left + 1]->tx_vcc->vci);
2561         }
2562 #endif /* 0 */
2563         return 0;
2564 }
2565
2566 static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg)
2567 {
2568         ns_dev *card;
2569         pool_levels pl;
2570         long btype;
2571         unsigned long flags;
2572
2573         card = dev->dev_data;
2574         switch (cmd) {
2575         case NS_GETPSTAT:
2576                 if (get_user
2577                     (pl.buftype, &((pool_levels __user *) arg)->buftype))
2578                         return -EFAULT;
2579                 switch (pl.buftype) {
2580                 case NS_BUFTYPE_SMALL:
2581                         pl.count =
2582                             ns_stat_sfbqc_get(readl(card->membase + STAT));
2583                         pl.level.min = card->sbnr.min;
2584                         pl.level.init = card->sbnr.init;
2585                         pl.level.max = card->sbnr.max;
2586                         break;
2587
2588                 case NS_BUFTYPE_LARGE:
2589                         pl.count =
2590                             ns_stat_lfbqc_get(readl(card->membase + STAT));
2591                         pl.level.min = card->lbnr.min;
2592                         pl.level.init = card->lbnr.init;
2593                         pl.level.max = card->lbnr.max;
2594                         break;
2595
2596                 case NS_BUFTYPE_HUGE:
2597                         pl.count = card->hbpool.count;
2598                         pl.level.min = card->hbnr.min;
2599                         pl.level.init = card->hbnr.init;
2600                         pl.level.max = card->hbnr.max;
2601                         break;
2602
2603                 case NS_BUFTYPE_IOVEC:
2604                         pl.count = card->iovpool.count;
2605                         pl.level.min = card->iovnr.min;
2606                         pl.level.init = card->iovnr.init;
2607                         pl.level.max = card->iovnr.max;
2608                         break;
2609
2610                 default:
2611                         return -ENOIOCTLCMD;
2612
2613                 }
2614                 if (!copy_to_user((pool_levels __user *) arg, &pl, sizeof(pl)))
2615                         return (sizeof(pl));
2616                 else
2617                         return -EFAULT;
2618
2619         case NS_SETBUFLEV:
2620                 if (!capable(CAP_NET_ADMIN))
2621                         return -EPERM;
2622                 if (copy_from_user(&pl, (pool_levels __user *) arg, sizeof(pl)))
2623                         return -EFAULT;
2624                 if (pl.level.min >= pl.level.init
2625                     || pl.level.init >= pl.level.max)
2626                         return -EINVAL;
2627                 if (pl.level.min == 0)
2628                         return -EINVAL;
2629                 switch (pl.buftype) {
2630                 case NS_BUFTYPE_SMALL:
2631                         if (pl.level.max > TOP_SB)
2632                                 return -EINVAL;
2633                         card->sbnr.min = pl.level.min;
2634                         card->sbnr.init = pl.level.init;
2635                         card->sbnr.max = pl.level.max;
2636                         break;
2637
2638                 case NS_BUFTYPE_LARGE:
2639                         if (pl.level.max > TOP_LB)
2640                                 return -EINVAL;
2641                         card->lbnr.min = pl.level.min;
2642                         card->lbnr.init = pl.level.init;
2643                         card->lbnr.max = pl.level.max;
2644                         break;
2645
2646                 case NS_BUFTYPE_HUGE:
2647                         if (pl.level.max > TOP_HB)
2648                                 return -EINVAL;
2649                         card->hbnr.min = pl.level.min;
2650                         card->hbnr.init = pl.level.init;
2651                         card->hbnr.max = pl.level.max;
2652                         break;
2653
2654                 case NS_BUFTYPE_IOVEC:
2655                         if (pl.level.max > TOP_IOVB)
2656                                 return -EINVAL;
2657                         card->iovnr.min = pl.level.min;
2658                         card->iovnr.init = pl.level.init;
2659                         card->iovnr.max = pl.level.max;
2660                         break;
2661
2662                 default:
2663                         return -EINVAL;
2664
2665                 }
2666                 return 0;
2667
2668         case NS_ADJBUFLEV:
2669                 if (!capable(CAP_NET_ADMIN))
2670                         return -EPERM;
2671                 btype = (long)arg;      /* a long is the same size as a pointer or bigger */
2672                 switch (btype) {
2673                 case NS_BUFTYPE_SMALL:
2674                         while (card->sbfqc < card->sbnr.init) {
2675                                 struct sk_buff *sb;
2676
2677                                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
2678                                 if (sb == NULL)
2679                                         return -ENOMEM;
2680                                 NS_PRV_BUFTYPE(sb) = BUF_SM;
2681                                 skb_queue_tail(&card->sbpool.queue, sb);
2682                                 skb_reserve(sb, NS_AAL0_HEADER);
2683                                 push_rxbufs(card, sb);
2684                         }
2685                         break;
2686
2687                 case NS_BUFTYPE_LARGE:
2688                         while (card->lbfqc < card->lbnr.init) {
2689                                 struct sk_buff *lb;
2690
2691                                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
2692                                 if (lb == NULL)
2693                                         return -ENOMEM;
2694                                 NS_PRV_BUFTYPE(lb) = BUF_LG;
2695                                 skb_queue_tail(&card->lbpool.queue, lb);
2696                                 skb_reserve(lb, NS_SMBUFSIZE);
2697                                 push_rxbufs(card, lb);
2698                         }
2699                         break;
2700
2701                 case NS_BUFTYPE_HUGE:
2702                         while (card->hbpool.count > card->hbnr.init) {
2703                                 struct sk_buff *hb;
2704
2705                                 spin_lock_irqsave(&card->int_lock, flags);
2706                                 hb = skb_dequeue(&card->hbpool.queue);
2707                                 card->hbpool.count--;
2708                                 spin_unlock_irqrestore(&card->int_lock, flags);
2709                                 if (hb == NULL)
2710                                         printk
2711                                             ("nicstar%d: huge buffer count inconsistent.\n",
2712                                              card->index);
2713                                 else
2714                                         dev_kfree_skb_any(hb);
2715
2716                         }
2717                         while (card->hbpool.count < card->hbnr.init) {
2718                                 struct sk_buff *hb;
2719
2720                                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
2721                                 if (hb == NULL)
2722                                         return -ENOMEM;
2723                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2724                                 spin_lock_irqsave(&card->int_lock, flags);
2725                                 skb_queue_tail(&card->hbpool.queue, hb);
2726                                 card->hbpool.count++;
2727                                 spin_unlock_irqrestore(&card->int_lock, flags);
2728                         }
2729                         break;
2730
2731                 case NS_BUFTYPE_IOVEC:
2732                         while (card->iovpool.count > card->iovnr.init) {
2733                                 struct sk_buff *iovb;
2734
2735                                 spin_lock_irqsave(&card->int_lock, flags);
2736                                 iovb = skb_dequeue(&card->iovpool.queue);
2737                                 card->iovpool.count--;
2738                                 spin_unlock_irqrestore(&card->int_lock, flags);
2739                                 if (iovb == NULL)
2740                                         printk
2741                                             ("nicstar%d: iovec buffer count inconsistent.\n",
2742                                              card->index);
2743                                 else
2744                                         dev_kfree_skb_any(iovb);
2745
2746                         }
2747                         while (card->iovpool.count < card->iovnr.init) {
2748                                 struct sk_buff *iovb;
2749
2750                                 iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
2751                                 if (iovb == NULL)
2752                                         return -ENOMEM;
2753                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2754                                 spin_lock_irqsave(&card->int_lock, flags);
2755                                 skb_queue_tail(&card->iovpool.queue, iovb);
2756                                 card->iovpool.count++;
2757                                 spin_unlock_irqrestore(&card->int_lock, flags);
2758                         }
2759                         break;
2760
2761                 default:
2762                         return -EINVAL;
2763
2764                 }
2765                 return 0;
2766
2767         default:
2768                 if (dev->phy && dev->phy->ioctl) {
2769                         return dev->phy->ioctl(dev, cmd, arg);
2770                 } else {
2771                         printk("nicstar%d: %s == NULL \n", card->index,
2772                                dev->phy ? "dev->phy->ioctl" : "dev->phy");
2773                         return -ENOIOCTLCMD;
2774                 }
2775         }
2776 }
2777
2778 #ifdef EXTRA_DEBUG
2779 static void which_list(ns_dev * card, struct sk_buff *skb)
2780 {
2781         printk("skb buf_type: 0x%08x\n", NS_PRV_BUFTYPE(skb));
2782 }
2783 #endif /* EXTRA_DEBUG */
2784
2785 static void ns_poll(unsigned long arg)
2786 {
2787         int i;
2788         ns_dev *card;
2789         unsigned long flags;
2790         u32 stat_r, stat_w;
2791
2792         PRINTK("nicstar: Entering ns_poll().\n");
2793         for (i = 0; i < num_cards; i++) {
2794                 card = cards[i];
2795                 if (spin_is_locked(&card->int_lock)) {
2796                         /* Probably it isn't worth spinning */
2797                         continue;
2798                 }
2799                 spin_lock_irqsave(&card->int_lock, flags);
2800
2801                 stat_w = 0;
2802                 stat_r = readl(card->membase + STAT);
2803                 if (stat_r & NS_STAT_TSIF)
2804                         stat_w |= NS_STAT_TSIF;
2805                 if (stat_r & NS_STAT_EOPDU)
2806                         stat_w |= NS_STAT_EOPDU;
2807
2808                 process_tsq(card);
2809                 process_rsq(card);
2810
2811                 writel(stat_w, card->membase + STAT);
2812                 spin_unlock_irqrestore(&card->int_lock, flags);
2813         }
2814         mod_timer(&ns_timer, jiffies + NS_POLL_PERIOD);
2815         PRINTK("nicstar: Leaving ns_poll().\n");
2816 }
2817
2818 static int ns_parse_mac(char *mac, unsigned char *esi)
2819 {
2820         int i, j;
2821         short byte1, byte0;
2822
2823         if (mac == NULL || esi == NULL)
2824                 return -1;
2825         j = 0;
2826         for (i = 0; i < 6; i++) {
2827                 if ((byte1 = hex_to_bin(mac[j++])) < 0)
2828                         return -1;
2829                 if ((byte0 = hex_to_bin(mac[j++])) < 0)
2830                         return -1;
2831                 esi[i] = (unsigned char)(byte1 * 16 + byte0);
2832                 if (i < 5) {
2833                         if (mac[j++] != ':')
2834                                 return -1;
2835                 }
2836         }
2837         return 0;
2838 }
2839
2840
2841 static void ns_phy_put(struct atm_dev *dev, unsigned char value,
2842                        unsigned long addr)
2843 {
2844         ns_dev *card;
2845         unsigned long flags;
2846
2847         card = dev->dev_data;
2848         spin_lock_irqsave(&card->res_lock, flags);
2849         while (CMD_BUSY(card)) ;
2850         writel((u32) value, card->membase + DR0);
2851         writel(NS_CMD_WRITE_UTILITY | 0x00000200 | (addr & 0x000000FF),
2852                card->membase + CMD);
2853         spin_unlock_irqrestore(&card->res_lock, flags);
2854 }
2855
2856 static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr)
2857 {
2858         ns_dev *card;
2859         unsigned long flags;
2860         u32 data;
2861
2862         card = dev->dev_data;
2863         spin_lock_irqsave(&card->res_lock, flags);
2864         while (CMD_BUSY(card)) ;
2865         writel(NS_CMD_READ_UTILITY | 0x00000200 | (addr & 0x000000FF),
2866                card->membase + CMD);
2867         while (CMD_BUSY(card)) ;
2868         data = readl(card->membase + DR0) & 0x000000FF;
2869         spin_unlock_irqrestore(&card->res_lock, flags);
2870         return (unsigned char)data;
2871 }
2872
2873 module_init(nicstar_init);
2874 module_exit(nicstar_cleanup);