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1 /*
2  * Driver for the Micron P320 SSD
3  *   Copyright (C) 2011 Micron Technology, Inc.
4  *
5  * Portions of this code were derived from works subjected to the
6  * following copyright:
7  *    Copyright (C) 2009 Integrated Device Technology, Inc.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  */
20
21 #include <linux/pci.h>
22 #include <linux/interrupt.h>
23 #include <linux/ata.h>
24 #include <linux/delay.h>
25 #include <linux/hdreg.h>
26 #include <linux/uaccess.h>
27 #include <linux/random.h>
28 #include <linux/smp.h>
29 #include <linux/compat.h>
30 #include <linux/fs.h>
31 #include <linux/module.h>
32 #include <linux/genhd.h>
33 #include <linux/blkdev.h>
34 #include <linux/bio.h>
35 #include <linux/dma-mapping.h>
36 #include <linux/idr.h>
37 #include <linux/kthread.h>
38 #include <../drivers/ata/ahci.h>
39 #include "mtip32xx.h"
40
41 #define HW_CMD_SLOT_SZ          (MTIP_MAX_COMMAND_SLOTS * 32)
42 #define HW_CMD_TBL_SZ           (AHCI_CMD_TBL_HDR_SZ + (MTIP_MAX_SG * 16))
43 #define HW_CMD_TBL_AR_SZ        (HW_CMD_TBL_SZ * MTIP_MAX_COMMAND_SLOTS)
44 #define HW_PORT_PRIV_DMA_SZ \
45                 (HW_CMD_SLOT_SZ + HW_CMD_TBL_AR_SZ + AHCI_RX_FIS_SZ)
46
47 #define HOST_HSORG              0xFC
48 #define HSORG_DISABLE_SLOTGRP_INTR (1<<24)
49 #define HSORG_DISABLE_SLOTGRP_PXIS (1<<16)
50 #define HSORG_HWREV             0xFF00
51 #define HSORG_STYLE             0x8
52 #define HSORG_SLOTGROUPS        0x7
53
54 #define PORT_COMMAND_ISSUE      0x38
55 #define PORT_SDBV               0x7C
56
57 #define PORT_OFFSET             0x100
58 #define PORT_MEM_SIZE           0x80
59
60 #define PORT_IRQ_ERR \
61         (PORT_IRQ_HBUS_ERR | PORT_IRQ_IF_ERR | PORT_IRQ_CONNECT | \
62          PORT_IRQ_PHYRDY | PORT_IRQ_UNK_FIS | PORT_IRQ_BAD_PMP | \
63          PORT_IRQ_TF_ERR | PORT_IRQ_HBUS_DATA_ERR | PORT_IRQ_IF_NONFATAL | \
64          PORT_IRQ_OVERFLOW)
65 #define PORT_IRQ_LEGACY \
66         (PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS)
67 #define PORT_IRQ_HANDLED \
68         (PORT_IRQ_SDB_FIS | PORT_IRQ_LEGACY | \
69          PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR | \
70          PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)
71 #define DEF_PORT_IRQ \
72         (PORT_IRQ_ERR | PORT_IRQ_LEGACY | PORT_IRQ_SDB_FIS)
73
74 /* product numbers */
75 #define MTIP_PRODUCT_UNKNOWN    0x00
76 #define MTIP_PRODUCT_ASICFPGA   0x11
77
78 /* Device instance number, incremented each time a device is probed. */
79 static int instance;
80
81 /*
82  * Global variable used to hold the major block device number
83  * allocated in mtip_init().
84  */
85 static int mtip_major;
86
87 static DEFINE_SPINLOCK(rssd_index_lock);
88 static DEFINE_IDA(rssd_index_ida);
89
90 #ifdef CONFIG_COMPAT
91 struct mtip_compat_ide_task_request_s {
92         __u8            io_ports[8];
93         __u8            hob_ports[8];
94         ide_reg_valid_t out_flags;
95         ide_reg_valid_t in_flags;
96         int             data_phase;
97         int             req_cmd;
98         compat_ulong_t  out_size;
99         compat_ulong_t  in_size;
100 };
101 #endif
102
103 /*
104  * This function check_for_surprise_removal is called
105  * while card is removed from the system and it will
106  * read the vendor id from the configration space
107  *
108  * @pdev Pointer to the pci_dev structure.
109  *
110  * return value
111  *       true if device removed, else false
112  */
113 static bool mtip_check_surprise_removal(struct pci_dev *pdev)
114 {
115         u16 vendor_id = 0;
116
117        /* Read the vendorID from the configuration space */
118         pci_read_config_word(pdev, 0x00, &vendor_id);
119         if (vendor_id == 0xFFFF)
120                 return true; /* device removed */
121
122         return false; /* device present */
123 }
124
125 /*
126  * This function is called for clean the pending command in the
127  * command slot during the surprise removal of device and return
128  * error to the upper layer.
129  *
130  * @dd Pointer to the DRIVER_DATA structure.
131  *
132  * return value
133  *      None
134  */
135 static void mtip_command_cleanup(struct driver_data *dd)
136 {
137         int group = 0, commandslot = 0, commandindex = 0;
138         struct mtip_cmd *command;
139         struct mtip_port *port = dd->port;
140
141         for (group = 0; group < 4; group++) {
142                 for (commandslot = 0; commandslot < 32; commandslot++) {
143                         if (!(port->allocated[group] & (1 << commandslot)))
144                                 continue;
145
146                         commandindex = group << 5 | commandslot;
147                         command = &port->commands[commandindex];
148
149                         if (atomic_read(&command->active)
150                             && (command->async_callback)) {
151                                 command->async_callback(command->async_data,
152                                         -ENODEV);
153                                 command->async_callback = NULL;
154                                 command->async_data = NULL;
155                         }
156
157                         dma_unmap_sg(&port->dd->pdev->dev,
158                                 command->sg,
159                                 command->scatter_ents,
160                                 command->direction);
161                 }
162         }
163
164         up(&port->cmd_slot);
165
166         atomic_set(&dd->drv_cleanup_done, true);
167 }
168
169 /*
170  * Obtain an empty command slot.
171  *
172  * This function needs to be reentrant since it could be called
173  * at the same time on multiple CPUs. The allocation of the
174  * command slot must be atomic.
175  *
176  * @port Pointer to the port data structure.
177  *
178  * return value
179  *      >= 0    Index of command slot obtained.
180  *      -1      No command slots available.
181  */
182 static int get_slot(struct mtip_port *port)
183 {
184         int slot, i;
185         unsigned int num_command_slots = port->dd->slot_groups * 32;
186
187         /*
188          * Try 10 times, because there is a small race here.
189          *  that's ok, because it's still cheaper than a lock.
190          *
191          * Race: Since this section is not protected by lock, same bit
192          * could be chosen by different process contexts running in
193          * different processor. So instead of costly lock, we are going
194          * with loop.
195          */
196         for (i = 0; i < 10; i++) {
197                 slot = find_next_zero_bit(port->allocated,
198                                          num_command_slots, 1);
199                 if ((slot < num_command_slots) &&
200                     (!test_and_set_bit(slot, port->allocated)))
201                         return slot;
202         }
203         dev_warn(&port->dd->pdev->dev, "Failed to get a tag.\n");
204
205         if (mtip_check_surprise_removal(port->dd->pdev)) {
206                 /* Device not present, clean outstanding commands */
207                 mtip_command_cleanup(port->dd);
208         }
209         return -1;
210 }
211
212 /*
213  * Release a command slot.
214  *
215  * @port Pointer to the port data structure.
216  * @tag  Tag of command to release
217  *
218  * return value
219  *      None
220  */
221 static inline void release_slot(struct mtip_port *port, int tag)
222 {
223         smp_mb__before_clear_bit();
224         clear_bit(tag, port->allocated);
225         smp_mb__after_clear_bit();
226 }
227
228 /*
229  * Reset the HBA (without sleeping)
230  *
231  * Just like hba_reset, except does not call sleep, so can be
232  * run from interrupt/tasklet context.
233  *
234  * @dd Pointer to the driver data structure.
235  *
236  * return value
237  *      0       The reset was successful.
238  *      -1      The HBA Reset bit did not clear.
239  */
240 static int hba_reset_nosleep(struct driver_data *dd)
241 {
242         unsigned long timeout;
243
244         /* Chip quirk: quiesce any chip function */
245         mdelay(10);
246
247         /* Set the reset bit */
248         writel(HOST_RESET, dd->mmio + HOST_CTL);
249
250         /* Flush */
251         readl(dd->mmio + HOST_CTL);
252
253         /*
254          * Wait 10ms then spin for up to 1 second
255          * waiting for reset acknowledgement
256          */
257         timeout = jiffies + msecs_to_jiffies(1000);
258         mdelay(10);
259         while ((readl(dd->mmio + HOST_CTL) & HOST_RESET)
260                  && time_before(jiffies, timeout))
261                 mdelay(1);
262
263         if (readl(dd->mmio + HOST_CTL) & HOST_RESET)
264                 return -1;
265
266         return 0;
267 }
268
269 /*
270  * Issue a command to the hardware.
271  *
272  * Set the appropriate bit in the s_active and Command Issue hardware
273  * registers, causing hardware command processing to begin.
274  *
275  * @port Pointer to the port structure.
276  * @tag  The tag of the command to be issued.
277  *
278  * return value
279  *      None
280  */
281 static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag)
282 {
283         unsigned long flags = 0;
284
285         atomic_set(&port->commands[tag].active, 1);
286
287         spin_lock_irqsave(&port->cmd_issue_lock, flags);
288
289         writel((1 << MTIP_TAG_BIT(tag)),
290                         port->s_active[MTIP_TAG_INDEX(tag)]);
291         writel((1 << MTIP_TAG_BIT(tag)),
292                         port->cmd_issue[MTIP_TAG_INDEX(tag)]);
293
294         spin_unlock_irqrestore(&port->cmd_issue_lock, flags);
295 }
296
297 /*
298  * Enable/disable the reception of FIS
299  *
300  * @port   Pointer to the port data structure
301  * @enable 1 to enable, 0 to disable
302  *
303  * return value
304  *      Previous state: 1 enabled, 0 disabled
305  */
306 static int mtip_enable_fis(struct mtip_port *port, int enable)
307 {
308         u32 tmp;
309
310         /* enable FIS reception */
311         tmp = readl(port->mmio + PORT_CMD);
312         if (enable)
313                 writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
314         else
315                 writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
316
317         /* Flush */
318         readl(port->mmio + PORT_CMD);
319
320         return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX));
321 }
322
323 /*
324  * Enable/disable the DMA engine
325  *
326  * @port   Pointer to the port data structure
327  * @enable 1 to enable, 0 to disable
328  *
329  * return value
330  *      Previous state: 1 enabled, 0 disabled.
331  */
332 static int mtip_enable_engine(struct mtip_port *port, int enable)
333 {
334         u32 tmp;
335
336         /* enable FIS reception */
337         tmp = readl(port->mmio + PORT_CMD);
338         if (enable)
339                 writel(tmp | PORT_CMD_START, port->mmio + PORT_CMD);
340         else
341                 writel(tmp & ~PORT_CMD_START, port->mmio + PORT_CMD);
342
343         readl(port->mmio + PORT_CMD);
344         return (((tmp & PORT_CMD_START) == PORT_CMD_START));
345 }
346
347 /*
348  * Enables the port DMA engine and FIS reception.
349  *
350  * return value
351  *      None
352  */
353 static inline void mtip_start_port(struct mtip_port *port)
354 {
355         /* Enable FIS reception */
356         mtip_enable_fis(port, 1);
357
358         /* Enable the DMA engine */
359         mtip_enable_engine(port, 1);
360 }
361
362 /*
363  * Deinitialize a port by disabling port interrupts, the DMA engine,
364  * and FIS reception.
365  *
366  * @port Pointer to the port structure
367  *
368  * return value
369  *      None
370  */
371 static inline void mtip_deinit_port(struct mtip_port *port)
372 {
373         /* Disable interrupts on this port */
374         writel(0, port->mmio + PORT_IRQ_MASK);
375
376         /* Disable the DMA engine */
377         mtip_enable_engine(port, 0);
378
379         /* Disable FIS reception */
380         mtip_enable_fis(port, 0);
381 }
382
383 /*
384  * Initialize a port.
385  *
386  * This function deinitializes the port by calling mtip_deinit_port() and
387  * then initializes it by setting the command header and RX FIS addresses,
388  * clearing the SError register and any pending port interrupts before
389  * re-enabling the default set of port interrupts.
390  *
391  * @port Pointer to the port structure.
392  *
393  * return value
394  *      None
395  */
396 static void mtip_init_port(struct mtip_port *port)
397 {
398         int i;
399         mtip_deinit_port(port);
400
401         /* Program the command list base and FIS base addresses */
402         if (readl(port->dd->mmio + HOST_CAP) & HOST_CAP_64) {
403                 writel((port->command_list_dma >> 16) >> 16,
404                          port->mmio + PORT_LST_ADDR_HI);
405                 writel((port->rxfis_dma >> 16) >> 16,
406                          port->mmio + PORT_FIS_ADDR_HI);
407         }
408
409         writel(port->command_list_dma & 0xFFFFFFFF,
410                         port->mmio + PORT_LST_ADDR);
411         writel(port->rxfis_dma & 0xFFFFFFFF, port->mmio + PORT_FIS_ADDR);
412
413         /* Clear SError */
414         writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);
415
416         /* reset the completed registers.*/
417         for (i = 0; i < port->dd->slot_groups; i++)
418                 writel(0xFFFFFFFF, port->completed[i]);
419
420         /* Clear any pending interrupts for this port */
421         writel(readl(port->mmio + PORT_IRQ_STAT), port->mmio + PORT_IRQ_STAT);
422
423         /* Enable port interrupts */
424         writel(DEF_PORT_IRQ, port->mmio + PORT_IRQ_MASK);
425 }
426
427 /*
428  * Restart a port
429  *
430  * @port Pointer to the port data structure.
431  *
432  * return value
433  *      None
434  */
435 static void mtip_restart_port(struct mtip_port *port)
436 {
437         unsigned long timeout;
438
439         /* Disable the DMA engine */
440         mtip_enable_engine(port, 0);
441
442         /* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */
443         timeout = jiffies + msecs_to_jiffies(500);
444         while ((readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON)
445                  && time_before(jiffies, timeout))
446                 ;
447
448         /*
449          * Chip quirk: escalate to hba reset if
450          * PxCMD.CR not clear after 500 ms
451          */
452         if (readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) {
453                 dev_warn(&port->dd->pdev->dev,
454                         "PxCMD.CR not clear, escalating reset\n");
455
456                 if (hba_reset_nosleep(port->dd))
457                         dev_err(&port->dd->pdev->dev,
458                                 "HBA reset escalation failed.\n");
459
460                 /* 30 ms delay before com reset to quiesce chip */
461                 mdelay(30);
462         }
463
464         dev_warn(&port->dd->pdev->dev, "Issuing COM reset\n");
465
466         /* Set PxSCTL.DET */
467         writel(readl(port->mmio + PORT_SCR_CTL) |
468                          1, port->mmio + PORT_SCR_CTL);
469         readl(port->mmio + PORT_SCR_CTL);
470
471         /* Wait 1 ms to quiesce chip function */
472         timeout = jiffies + msecs_to_jiffies(1);
473         while (time_before(jiffies, timeout))
474                 ;
475
476         /* Clear PxSCTL.DET */
477         writel(readl(port->mmio + PORT_SCR_CTL) & ~1,
478                          port->mmio + PORT_SCR_CTL);
479         readl(port->mmio + PORT_SCR_CTL);
480
481         /* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */
482         timeout = jiffies + msecs_to_jiffies(500);
483         while (((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
484                          && time_before(jiffies, timeout))
485                 ;
486
487         if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
488                 dev_warn(&port->dd->pdev->dev,
489                         "COM reset failed\n");
490
491         /* Clear SError, the PxSERR.DIAG.x should be set so clear it */
492         writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);
493
494         /* Enable the DMA engine */
495         mtip_enable_engine(port, 1);
496 }
497
498 /*
499  * Called periodically to see if any read/write commands are
500  * taking too long to complete.
501  *
502  * @data Pointer to the PORT data structure.
503  *
504  * return value
505  *      None
506  */
507 static void mtip_timeout_function(unsigned long int data)
508 {
509         struct mtip_port *port = (struct mtip_port *) data;
510         struct host_to_dev_fis *fis;
511         struct mtip_cmd *command;
512         int tag, cmdto_cnt = 0;
513         unsigned int bit, group;
514         unsigned int num_command_slots = port->dd->slot_groups * 32;
515
516         if (unlikely(!port))
517                 return;
518
519         if (atomic_read(&port->dd->resumeflag) == true) {
520                 mod_timer(&port->cmd_timer,
521                         jiffies + msecs_to_jiffies(30000));
522                 return;
523         }
524
525         for (tag = 0; tag < num_command_slots; tag++) {
526                 /*
527                  * Skip internal command slot as it has
528                  * its own timeout mechanism
529                  */
530                 if (tag == MTIP_TAG_INTERNAL)
531                         continue;
532
533                 if (atomic_read(&port->commands[tag].active) &&
534                    (time_after(jiffies, port->commands[tag].comp_time))) {
535                         group = tag >> 5;
536                         bit = tag & 0x1F;
537
538                         command = &port->commands[tag];
539                         fis = (struct host_to_dev_fis *) command->command;
540
541                         dev_warn(&port->dd->pdev->dev,
542                                 "Timeout for command tag %d\n", tag);
543
544                         cmdto_cnt++;
545                         if (cmdto_cnt == 1)
546                                 set_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags);
547
548                         /*
549                          * Clear the completed bit. This should prevent
550                          *  any interrupt handlers from trying to retire
551                          *  the command.
552                          */
553                         writel(1 << bit, port->completed[group]);
554
555                         /* Call the async completion callback. */
556                         if (likely(command->async_callback))
557                                 command->async_callback(command->async_data,
558                                                          -EIO);
559                         command->async_callback = NULL;
560                         command->comp_func = NULL;
561
562                         /* Unmap the DMA scatter list entries */
563                         dma_unmap_sg(&port->dd->pdev->dev,
564                                         command->sg,
565                                         command->scatter_ents,
566                                         command->direction);
567
568                         /*
569                          * Clear the allocated bit and active tag for the
570                          * command.
571                          */
572                         atomic_set(&port->commands[tag].active, 0);
573                         release_slot(port, tag);
574
575                         up(&port->cmd_slot);
576                 }
577         }
578
579         if (cmdto_cnt) {
580                 dev_warn(&port->dd->pdev->dev,
581                         "%d commands timed out: restarting port",
582                         cmdto_cnt);
583                 mtip_restart_port(port);
584                 clear_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags);
585                 wake_up_interruptible(&port->svc_wait);
586         }
587
588         /* Restart the timer */
589         mod_timer(&port->cmd_timer,
590                 jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
591 }
592
593 /*
594  * IO completion function.
595  *
596  * This completion function is called by the driver ISR when a
597  * command that was issued by the kernel completes. It first calls the
598  * asynchronous completion function which normally calls back into the block
599  * layer passing the asynchronous callback data, then unmaps the
600  * scatter list associated with the completed command, and finally
601  * clears the allocated bit associated with the completed command.
602  *
603  * @port   Pointer to the port data structure.
604  * @tag    Tag of the command.
605  * @data   Pointer to driver_data.
606  * @status Completion status.
607  *
608  * return value
609  *      None
610  */
611 static void mtip_async_complete(struct mtip_port *port,
612                                 int tag,
613                                 void *data,
614                                 int status)
615 {
616         struct mtip_cmd *command;
617         struct driver_data *dd = data;
618         int cb_status = status ? -EIO : 0;
619
620         if (unlikely(!dd) || unlikely(!port))
621                 return;
622
623         command = &port->commands[tag];
624
625         if (unlikely(status == PORT_IRQ_TF_ERR)) {
626                 dev_warn(&port->dd->pdev->dev,
627                         "Command tag %d failed due to TFE\n", tag);
628         }
629
630         /* Upper layer callback */
631         if (likely(command->async_callback))
632                 command->async_callback(command->async_data, cb_status);
633
634         command->async_callback = NULL;
635         command->comp_func = NULL;
636
637         /* Unmap the DMA scatter list entries */
638         dma_unmap_sg(&dd->pdev->dev,
639                 command->sg,
640                 command->scatter_ents,
641                 command->direction);
642
643         /* Clear the allocated and active bits for the command */
644         atomic_set(&port->commands[tag].active, 0);
645         release_slot(port, tag);
646
647         up(&port->cmd_slot);
648 }
649
650 /*
651  * Internal command completion callback function.
652  *
653  * This function is normally called by the driver ISR when an internal
654  * command completed. This function signals the command completion by
655  * calling complete().
656  *
657  * @port   Pointer to the port data structure.
658  * @tag    Tag of the command that has completed.
659  * @data   Pointer to a completion structure.
660  * @status Completion status.
661  *
662  * return value
663  *      None
664  */
665 static void mtip_completion(struct mtip_port *port,
666                             int tag,
667                             void *data,
668                             int status)
669 {
670         struct mtip_cmd *command = &port->commands[tag];
671         struct completion *waiting = data;
672         if (unlikely(status == PORT_IRQ_TF_ERR))
673                 dev_warn(&port->dd->pdev->dev,
674                         "Internal command %d completed with TFE\n", tag);
675
676         command->async_callback = NULL;
677         command->comp_func = NULL;
678
679         complete(waiting);
680 }
681
682 /*
683  * Helper function for tag logging
684  */
685 static void print_tags(struct driver_data *dd,
686                         char *msg,
687                         unsigned long *tagbits)
688 {
689         unsigned int tag, count = 0;
690
691         for (tag = 0; tag < (dd->slot_groups) * 32; tag++) {
692                 if (test_bit(tag, tagbits))
693                         count++;
694         }
695         if (count)
696                 dev_info(&dd->pdev->dev, "%s [%i tags]\n", msg, count);
697 }
698
699 /*
700  * Handle an error.
701  *
702  * @dd Pointer to the DRIVER_DATA structure.
703  *
704  * return value
705  *      None
706  */
707 static void mtip_handle_tfe(struct driver_data *dd)
708 {
709         int group, tag, bit, reissue;
710         struct mtip_port *port;
711         struct mtip_cmd  *command;
712         u32 completed;
713         struct host_to_dev_fis *fis;
714         unsigned long tagaccum[SLOTBITS_IN_LONGS];
715
716         dev_warn(&dd->pdev->dev, "Taskfile error\n");
717
718         port = dd->port;
719
720         /* Stop the timer to prevent command timeouts. */
721         del_timer(&port->cmd_timer);
722
723         /* Set eh_active */
724         set_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags);
725
726         /* Loop through all the groups */
727         for (group = 0; group < dd->slot_groups; group++) {
728                 completed = readl(port->completed[group]);
729
730                 /* clear completed status register in the hardware.*/
731                 writel(completed, port->completed[group]);
732
733                 /* clear the tag accumulator */
734                 memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
735
736                 /* Process successfully completed commands */
737                 for (bit = 0; bit < 32 && completed; bit++) {
738                         if (!(completed & (1<<bit)))
739                                 continue;
740                         tag = (group << 5) + bit;
741
742                         /* Skip the internal command slot */
743                         if (tag == MTIP_TAG_INTERNAL)
744                                 continue;
745
746                         command = &port->commands[tag];
747                         if (likely(command->comp_func)) {
748                                 set_bit(tag, tagaccum);
749                                 atomic_set(&port->commands[tag].active, 0);
750                                 command->comp_func(port,
751                                          tag,
752                                          command->comp_data,
753                                          0);
754                         } else {
755                                 dev_err(&port->dd->pdev->dev,
756                                         "Missing completion func for tag %d",
757                                         tag);
758                                 if (mtip_check_surprise_removal(dd->pdev)) {
759                                         mtip_command_cleanup(dd);
760                                         /* don't proceed further */
761                                         return;
762                                 }
763                         }
764                 }
765         }
766         print_tags(dd, "TFE tags completed:", tagaccum);
767
768         /* Restart the port */
769         mdelay(20);
770         mtip_restart_port(port);
771
772         /* clear the tag accumulator */
773         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
774
775         /* Loop through all the groups */
776         for (group = 0; group < dd->slot_groups; group++) {
777                 for (bit = 0; bit < 32; bit++) {
778                         reissue = 1;
779                         tag = (group << 5) + bit;
780
781                         /* If the active bit is set re-issue the command */
782                         if (atomic_read(&port->commands[tag].active) == 0)
783                                 continue;
784
785                         fis = (struct host_to_dev_fis *)
786                                 port->commands[tag].command;
787
788                         /* Should re-issue? */
789                         if (tag == MTIP_TAG_INTERNAL ||
790                             fis->command == ATA_CMD_SET_FEATURES)
791                                 reissue = 0;
792
793                         /*
794                          * First check if this command has
795                          *  exceeded its retries.
796                          */
797                         if (reissue &&
798                             (port->commands[tag].retries-- > 0)) {
799
800                                 set_bit(tag, tagaccum);
801
802                                 /* Update the timeout value. */
803                                 port->commands[tag].comp_time =
804                                         jiffies + msecs_to_jiffies(
805                                         MTIP_NCQ_COMMAND_TIMEOUT_MS);
806                                 /* Re-issue the command. */
807                                 mtip_issue_ncq_command(port, tag);
808
809                                 continue;
810                         }
811
812                         /* Retire a command that will not be reissued */
813                         dev_warn(&port->dd->pdev->dev,
814                                 "retiring tag %d\n", tag);
815                         atomic_set(&port->commands[tag].active, 0);
816
817                         if (port->commands[tag].comp_func)
818                                 port->commands[tag].comp_func(
819                                         port,
820                                         tag,
821                                         port->commands[tag].comp_data,
822                                         PORT_IRQ_TF_ERR);
823                         else
824                                 dev_warn(&port->dd->pdev->dev,
825                                         "Bad completion for tag %d\n",
826                                         tag);
827                 }
828         }
829         print_tags(dd, "TFE tags reissued:", tagaccum);
830
831         /* clear eh_active */
832         clear_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags);
833         wake_up_interruptible(&port->svc_wait);
834
835         mod_timer(&port->cmd_timer,
836                  jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
837 }
838
839 /*
840  * Handle a set device bits interrupt
841  */
842 static inline void mtip_process_sdbf(struct driver_data *dd)
843 {
844         struct mtip_port  *port = dd->port;
845         int group, tag, bit;
846         u32 completed;
847         struct mtip_cmd *command;
848
849         /* walk all bits in all slot groups */
850         for (group = 0; group < dd->slot_groups; group++) {
851                 completed = readl(port->completed[group]);
852
853                 /* clear completed status register in the hardware.*/
854                 writel(completed, port->completed[group]);
855
856                 /* Process completed commands. */
857                 for (bit = 0;
858                      (bit < 32) && completed;
859                      bit++, completed >>= 1) {
860                         if (completed & 0x01) {
861                                 tag = (group << 5) | bit;
862
863                                 /* skip internal command slot. */
864                                 if (unlikely(tag == MTIP_TAG_INTERNAL))
865                                         continue;
866
867                                 command = &port->commands[tag];
868                                 /* make internal callback */
869                                 if (likely(command->comp_func)) {
870                                         command->comp_func(
871                                                 port,
872                                                 tag,
873                                                 command->comp_data,
874                                                 0);
875                                 } else {
876                                         dev_warn(&dd->pdev->dev,
877                                                 "Null completion "
878                                                 "for tag %d",
879                                                 tag);
880
881                                         if (mtip_check_surprise_removal(
882                                                 dd->pdev)) {
883                                                 mtip_command_cleanup(dd);
884                                                 return;
885                                         }
886                                 }
887                         }
888                 }
889         }
890 }
891
892 /*
893  * Process legacy pio and d2h interrupts
894  */
895 static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat)
896 {
897         struct mtip_port *port = dd->port;
898         struct mtip_cmd *cmd = &port->commands[MTIP_TAG_INTERNAL];
899
900         if (test_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags) &&
901             (cmd != NULL) && !(readl(port->cmd_issue[MTIP_TAG_INTERNAL])
902                 & (1 << MTIP_TAG_INTERNAL))) {
903                 if (cmd->comp_func) {
904                         cmd->comp_func(port,
905                                 MTIP_TAG_INTERNAL,
906                                 cmd->comp_data,
907                                 0);
908                         return;
909                 }
910         }
911
912         dev_warn(&dd->pdev->dev, "IRQ status 0x%x ignored.\n", port_stat);
913
914         return;
915 }
916
917 /*
918  * Demux and handle errors
919  */
920 static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat)
921 {
922         if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR)))
923                 mtip_handle_tfe(dd);
924
925         if (unlikely(port_stat & PORT_IRQ_CONNECT)) {
926                 dev_warn(&dd->pdev->dev,
927                         "Clearing PxSERR.DIAG.x\n");
928                 writel((1 << 26), dd->port->mmio + PORT_SCR_ERR);
929         }
930
931         if (unlikely(port_stat & PORT_IRQ_PHYRDY)) {
932                 dev_warn(&dd->pdev->dev,
933                         "Clearing PxSERR.DIAG.n\n");
934                 writel((1 << 16), dd->port->mmio + PORT_SCR_ERR);
935         }
936
937         if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) {
938                 dev_warn(&dd->pdev->dev,
939                         "Port stat errors %x unhandled\n",
940                         (port_stat & ~PORT_IRQ_HANDLED));
941         }
942 }
943
944 static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
945 {
946         struct driver_data *dd = (struct driver_data *) data;
947         struct mtip_port *port = dd->port;
948         u32 hba_stat, port_stat;
949         int rv = IRQ_NONE;
950
951         hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
952         if (hba_stat) {
953                 rv = IRQ_HANDLED;
954
955                 /* Acknowledge the interrupt status on the port.*/
956                 port_stat = readl(port->mmio + PORT_IRQ_STAT);
957                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
958
959                 /* Demux port status */
960                 if (likely(port_stat & PORT_IRQ_SDB_FIS))
961                         mtip_process_sdbf(dd);
962
963                 if (unlikely(port_stat & PORT_IRQ_ERR)) {
964                         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
965                                 mtip_command_cleanup(dd);
966                                 /* don't proceed further */
967                                 return IRQ_HANDLED;
968                         }
969
970                         mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
971                 }
972
973                 if (unlikely(port_stat & PORT_IRQ_LEGACY))
974                         mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY);
975         }
976
977         /* acknowledge interrupt */
978         writel(hba_stat, dd->mmio + HOST_IRQ_STAT);
979
980         return rv;
981 }
982
983 /*
984  * Wrapper for mtip_handle_irq
985  * (ignores return code)
986  */
987 static void mtip_tasklet(unsigned long data)
988 {
989         mtip_handle_irq((struct driver_data *) data);
990 }
991
992 /*
993  * HBA interrupt subroutine.
994  *
995  * @irq         IRQ number.
996  * @instance    Pointer to the driver data structure.
997  *
998  * return value
999  *      IRQ_HANDLED     A HBA interrupt was pending and handled.
1000  *      IRQ_NONE        This interrupt was not for the HBA.
1001  */
1002 static irqreturn_t mtip_irq_handler(int irq, void *instance)
1003 {
1004         struct driver_data *dd = instance;
1005         tasklet_schedule(&dd->tasklet);
1006         return IRQ_HANDLED;
1007 }
1008
1009 static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
1010 {
1011         atomic_set(&port->commands[tag].active, 1);
1012         writel(1 << MTIP_TAG_BIT(tag),
1013                 port->cmd_issue[MTIP_TAG_INDEX(tag)]);
1014 }
1015
1016 /*
1017  * Wait for port to quiesce
1018  *
1019  * @port    Pointer to port data structure
1020  * @timeout Max duration to wait (ms)
1021  *
1022  * return value
1023  *      0       Success
1024  *      -EBUSY  Commands still active
1025  */
1026 static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
1027 {
1028         unsigned long to;
1029         unsigned int n, active;
1030
1031         to = jiffies + msecs_to_jiffies(timeout);
1032         do {
1033                 if (test_bit(MTIP_FLAG_SVC_THD_ACTIVE_BIT, &port->flags)) {
1034                         msleep(20);
1035                         continue; /* svc thd is actively issuing commands */
1036                 }
1037                 /*
1038                  * Ignore s_active bit 0 of array element 0.
1039                  * This bit will always be set
1040                  */
1041                 active = readl(port->s_active[0]) & 0xFFFFFFFE;
1042                 for (n = 1; n < port->dd->slot_groups; n++)
1043                         active |= readl(port->s_active[n]);
1044
1045                 if (!active)
1046                         break;
1047
1048                 msleep(20);
1049         } while (time_before(jiffies, to));
1050
1051         return active ? -EBUSY : 0;
1052 }
1053
1054 /*
1055  * Execute an internal command and wait for the completion.
1056  *
1057  * @port    Pointer to the port data structure.
1058  * @fis     Pointer to the FIS that describes the command.
1059  * @fis_len  Length in WORDS of the FIS.
1060  * @buffer  DMA accessible for command data.
1061  * @buf_len  Length, in bytes, of the data buffer.
1062  * @opts    Command header options, excluding the FIS length
1063  *             and the number of PRD entries.
1064  * @timeout Time in ms to wait for the command to complete.
1065  *
1066  * return value
1067  *      0        Command completed successfully.
1068  *      -EFAULT  The buffer address is not correctly aligned.
1069  *      -EBUSY   Internal command or other IO in progress.
1070  *      -EAGAIN  Time out waiting for command to complete.
1071  */
1072 static int mtip_exec_internal_command(struct mtip_port *port,
1073                                         void *fis,
1074                                         int fis_len,
1075                                         dma_addr_t buffer,
1076                                         int buf_len,
1077                                         u32 opts,
1078                                         gfp_t atomic,
1079                                         unsigned long timeout)
1080 {
1081         struct mtip_cmd_sg *command_sg;
1082         DECLARE_COMPLETION_ONSTACK(wait);
1083         int rv = 0;
1084         struct mtip_cmd *int_cmd = &port->commands[MTIP_TAG_INTERNAL];
1085
1086         /* Make sure the buffer is 8 byte aligned. This is asic specific. */
1087         if (buffer & 0x00000007) {
1088                 dev_err(&port->dd->pdev->dev,
1089                         "SG buffer is not 8 byte aligned\n");
1090                 return -EFAULT;
1091         }
1092
1093         /* Only one internal command should be running at a time */
1094         if (test_and_set_bit(MTIP_TAG_INTERNAL, port->allocated)) {
1095                 dev_warn(&port->dd->pdev->dev,
1096                         "Internal command already active\n");
1097                 return -EBUSY;
1098         }
1099         set_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags);
1100
1101         if (atomic == GFP_KERNEL) {
1102                 /* wait for io to complete if non atomic */
1103                 if (mtip_quiesce_io(port, 5000) < 0) {
1104                         dev_warn(&port->dd->pdev->dev,
1105                                 "Failed to quiesce IO\n");
1106                         release_slot(port, MTIP_TAG_INTERNAL);
1107                         clear_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags);
1108                         wake_up_interruptible(&port->svc_wait);
1109                         return -EBUSY;
1110                 }
1111
1112                 /* Set the completion function and data for the command. */
1113                 int_cmd->comp_data = &wait;
1114                 int_cmd->comp_func = mtip_completion;
1115
1116         } else {
1117                 /* Clear completion - we're going to poll */
1118                 int_cmd->comp_data = NULL;
1119                 int_cmd->comp_func = NULL;
1120         }
1121
1122         /* Copy the command to the command table */
1123         memcpy(int_cmd->command, fis, fis_len*4);
1124
1125         /* Populate the SG list */
1126         int_cmd->command_header->opts =
1127                  __force_bit2int cpu_to_le32(opts | fis_len);
1128         if (buf_len) {
1129                 command_sg = int_cmd->command + AHCI_CMD_TBL_HDR_SZ;
1130
1131                 command_sg->info =
1132                         __force_bit2int cpu_to_le32((buf_len-1) & 0x3FFFFF);
1133                 command_sg->dba =
1134                         __force_bit2int cpu_to_le32(buffer & 0xFFFFFFFF);
1135                 command_sg->dba_upper =
1136                         __force_bit2int cpu_to_le32((buffer >> 16) >> 16);
1137
1138                 int_cmd->command_header->opts |=
1139                         __force_bit2int cpu_to_le32((1 << 16));
1140         }
1141
1142         /* Populate the command header */
1143         int_cmd->command_header->byte_count = 0;
1144
1145         /* Issue the command to the hardware */
1146         mtip_issue_non_ncq_command(port, MTIP_TAG_INTERNAL);
1147
1148         /* Poll if atomic, wait_for_completion otherwise */
1149         if (atomic == GFP_KERNEL) {
1150                 /* Wait for the command to complete or timeout. */
1151                 if (wait_for_completion_timeout(
1152                                 &wait,
1153                                 msecs_to_jiffies(timeout)) == 0) {
1154                         dev_err(&port->dd->pdev->dev,
1155                                 "Internal command did not complete [%d] "
1156                                 "within timeout of  %lu ms\n",
1157                                 atomic, timeout);
1158                         rv = -EAGAIN;
1159                 }
1160
1161                 if (readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1162                         & (1 << MTIP_TAG_INTERNAL)) {
1163                         dev_warn(&port->dd->pdev->dev,
1164                                 "Retiring internal command but CI is 1.\n");
1165                 }
1166
1167         } else {
1168                 /* Spin for <timeout> checking if command still outstanding */
1169                 timeout = jiffies + msecs_to_jiffies(timeout);
1170
1171                 while ((readl(
1172                         port->cmd_issue[MTIP_TAG_INTERNAL])
1173                         & (1 << MTIP_TAG_INTERNAL))
1174                         && time_before(jiffies, timeout))
1175                         ;
1176
1177                 if (readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1178                         & (1 << MTIP_TAG_INTERNAL)) {
1179                         dev_err(&port->dd->pdev->dev,
1180                                 "Internal command did not complete [%d]\n",
1181                                 atomic);
1182                         rv = -EAGAIN;
1183                 }
1184         }
1185
1186         /* Clear the allocated and active bits for the internal command. */
1187         atomic_set(&int_cmd->active, 0);
1188         release_slot(port, MTIP_TAG_INTERNAL);
1189         clear_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags);
1190         wake_up_interruptible(&port->svc_wait);
1191
1192         return rv;
1193 }
1194
1195 /*
1196  * Byte-swap ATA ID strings.
1197  *
1198  * ATA identify data contains strings in byte-swapped 16-bit words.
1199  * They must be swapped (on all architectures) to be usable as C strings.
1200  * This function swaps bytes in-place.
1201  *
1202  * @buf The buffer location of the string
1203  * @len The number of bytes to swap
1204  *
1205  * return value
1206  *      None
1207  */
1208 static inline void ata_swap_string(u16 *buf, unsigned int len)
1209 {
1210         int i;
1211         for (i = 0; i < (len/2); i++)
1212                 be16_to_cpus(&buf[i]);
1213 }
1214
1215 /*
1216  * Request the device identity information.
1217  *
1218  * If a user space buffer is not specified, i.e. is NULL, the
1219  * identify information is still read from the drive and placed
1220  * into the identify data buffer (@e port->identify) in the
1221  * port data structure.
1222  * When the identify buffer contains valid identify information @e
1223  * port->identify_valid is non-zero.
1224  *
1225  * @port         Pointer to the port structure.
1226  * @user_buffer  A user space buffer where the identify data should be
1227  *                    copied.
1228  *
1229  * return value
1230  *      0       Command completed successfully.
1231  *      -EFAULT An error occurred while coping data to the user buffer.
1232  *      -1      Command failed.
1233  */
1234 static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
1235 {
1236         int rv = 0;
1237         struct host_to_dev_fis fis;
1238
1239         /* Build the FIS. */
1240         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1241         fis.type        = 0x27;
1242         fis.opts        = 1 << 7;
1243         fis.command     = ATA_CMD_ID_ATA;
1244
1245         /* Set the identify information as invalid. */
1246         port->identify_valid = 0;
1247
1248         /* Clear the identify information. */
1249         memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);
1250
1251         /* Execute the command. */
1252         if (mtip_exec_internal_command(port,
1253                                 &fis,
1254                                 5,
1255                                 port->identify_dma,
1256                                 sizeof(u16) * ATA_ID_WORDS,
1257                                 0,
1258                                 GFP_KERNEL,
1259                                 MTIP_INTERNAL_COMMAND_TIMEOUT_MS)
1260                                 < 0) {
1261                 rv = -1;
1262                 goto out;
1263         }
1264
1265         /*
1266          * Perform any necessary byte-swapping.  Yes, the kernel does in fact
1267          * perform field-sensitive swapping on the string fields.
1268          * See the kernel use of ata_id_string() for proof of this.
1269          */
1270 #ifdef __LITTLE_ENDIAN
1271         ata_swap_string(port->identify + 27, 40);  /* model string*/
1272         ata_swap_string(port->identify + 23, 8);   /* firmware string*/
1273         ata_swap_string(port->identify + 10, 20);  /* serial# string*/
1274 #else
1275         {
1276                 int i;
1277                 for (i = 0; i < ATA_ID_WORDS; i++)
1278                         port->identify[i] = le16_to_cpu(port->identify[i]);
1279         }
1280 #endif
1281
1282         /* Set the identify buffer as valid. */
1283         port->identify_valid = 1;
1284
1285         if (user_buffer) {
1286                 if (copy_to_user(
1287                         user_buffer,
1288                         port->identify,
1289                         ATA_ID_WORDS * sizeof(u16))) {
1290                         rv = -EFAULT;
1291                         goto out;
1292                 }
1293         }
1294
1295 out:
1296         return rv;
1297 }
1298
1299 /*
1300  * Issue a standby immediate command to the device.
1301  *
1302  * @port Pointer to the port structure.
1303  *
1304  * return value
1305  *      0       Command was executed successfully.
1306  *      -1      An error occurred while executing the command.
1307  */
1308 static int mtip_standby_immediate(struct mtip_port *port)
1309 {
1310         int rv;
1311         struct host_to_dev_fis  fis;
1312
1313         /* Build the FIS. */
1314         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1315         fis.type        = 0x27;
1316         fis.opts        = 1 << 7;
1317         fis.command     = ATA_CMD_STANDBYNOW1;
1318
1319         /* Execute the command.  Use a 15-second timeout for large drives. */
1320         rv = mtip_exec_internal_command(port,
1321                                         &fis,
1322                                         5,
1323                                         0,
1324                                         0,
1325                                         0,
1326                                         GFP_KERNEL,
1327                                         15000);
1328
1329         return rv;
1330 }
1331
1332 /*
1333  * Get the drive capacity.
1334  *
1335  * @dd      Pointer to the device data structure.
1336  * @sectors Pointer to the variable that will receive the sector count.
1337  *
1338  * return value
1339  *      1 Capacity was returned successfully.
1340  *      0 The identify information is invalid.
1341  */
1342 static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
1343 {
1344         struct mtip_port *port = dd->port;
1345         u64 total, raw0, raw1, raw2, raw3;
1346         raw0 = port->identify[100];
1347         raw1 = port->identify[101];
1348         raw2 = port->identify[102];
1349         raw3 = port->identify[103];
1350         total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
1351         *sectors = total;
1352         return (bool) !!port->identify_valid;
1353 }
1354
1355 /*
1356  * Reset the HBA.
1357  *
1358  * Resets the HBA by setting the HBA Reset bit in the Global
1359  * HBA Control register. After setting the HBA Reset bit the
1360  * function waits for 1 second before reading the HBA Reset
1361  * bit to make sure it has cleared. If HBA Reset is not clear
1362  * an error is returned. Cannot be used in non-blockable
1363  * context.
1364  *
1365  * @dd Pointer to the driver data structure.
1366  *
1367  * return value
1368  *      0  The reset was successful.
1369  *      -1 The HBA Reset bit did not clear.
1370  */
1371 static int mtip_hba_reset(struct driver_data *dd)
1372 {
1373         mtip_deinit_port(dd->port);
1374
1375         /* Set the reset bit */
1376         writel(HOST_RESET, dd->mmio + HOST_CTL);
1377
1378         /* Flush */
1379         readl(dd->mmio + HOST_CTL);
1380
1381         /* Wait for reset to clear */
1382         ssleep(1);
1383
1384         /* Check the bit has cleared */
1385         if (readl(dd->mmio + HOST_CTL) & HOST_RESET) {
1386                 dev_err(&dd->pdev->dev,
1387                         "Reset bit did not clear.\n");
1388                 return -1;
1389         }
1390
1391         return 0;
1392 }
1393
1394 /*
1395  * Display the identify command data.
1396  *
1397  * @port Pointer to the port data structure.
1398  *
1399  * return value
1400  *      None
1401  */
1402 static void mtip_dump_identify(struct mtip_port *port)
1403 {
1404         sector_t sectors;
1405         unsigned short revid;
1406         char cbuf[42];
1407
1408         if (!port->identify_valid)
1409                 return;
1410
1411         strlcpy(cbuf, (char *)(port->identify+10), 21);
1412         dev_info(&port->dd->pdev->dev,
1413                 "Serial No.: %s\n", cbuf);
1414
1415         strlcpy(cbuf, (char *)(port->identify+23), 9);
1416         dev_info(&port->dd->pdev->dev,
1417                 "Firmware Ver.: %s\n", cbuf);
1418
1419         strlcpy(cbuf, (char *)(port->identify+27), 41);
1420         dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);
1421
1422         if (mtip_hw_get_capacity(port->dd, &sectors))
1423                 dev_info(&port->dd->pdev->dev,
1424                         "Capacity: %llu sectors (%llu MB)\n",
1425                          (u64)sectors,
1426                          ((u64)sectors) * ATA_SECT_SIZE >> 20);
1427
1428         pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
1429         switch (revid & 0xFF) {
1430         case 0x1:
1431                 strlcpy(cbuf, "A0", 3);
1432                 break;
1433         case 0x3:
1434                 strlcpy(cbuf, "A2", 3);
1435                 break;
1436         default:
1437                 strlcpy(cbuf, "?", 2);
1438                 break;
1439         }
1440         dev_info(&port->dd->pdev->dev,
1441                 "Card Type: %s\n", cbuf);
1442 }
1443
1444 /*
1445  * Map the commands scatter list into the command table.
1446  *
1447  * @command Pointer to the command.
1448  * @nents Number of scatter list entries.
1449  *
1450  * return value
1451  *      None
1452  */
1453 static inline void fill_command_sg(struct driver_data *dd,
1454                                 struct mtip_cmd *command,
1455                                 int nents)
1456 {
1457         int n;
1458         unsigned int dma_len;
1459         struct mtip_cmd_sg *command_sg;
1460         struct scatterlist *sg = command->sg;
1461
1462         command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
1463
1464         for (n = 0; n < nents; n++) {
1465                 dma_len = sg_dma_len(sg);
1466                 if (dma_len > 0x400000)
1467                         dev_err(&dd->pdev->dev,
1468                                 "DMA segment length truncated\n");
1469                 command_sg->info = __force_bit2int
1470                         cpu_to_le32((dma_len-1) & 0x3FFFFF);
1471                 command_sg->dba = __force_bit2int
1472                         cpu_to_le32(sg_dma_address(sg));
1473                 command_sg->dba_upper = __force_bit2int
1474                         cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
1475                 command_sg++;
1476                 sg++;
1477         }
1478 }
1479
1480 /*
1481  * @brief Execute a drive command.
1482  *
1483  * return value 0 The command completed successfully.
1484  * return value -1 An error occurred while executing the command.
1485  */
1486 static int exec_drive_task(struct mtip_port *port, u8 *command)
1487 {
1488         struct host_to_dev_fis  fis;
1489         struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
1490
1491         /* Build the FIS. */
1492         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1493         fis.type        = 0x27;
1494         fis.opts        = 1 << 7;
1495         fis.command     = command[0];
1496         fis.features    = command[1];
1497         fis.sect_count  = command[2];
1498         fis.sector      = command[3];
1499         fis.cyl_low     = command[4];
1500         fis.cyl_hi      = command[5];
1501         fis.device      = command[6] & ~0x10; /* Clear the dev bit*/
1502
1503
1504         dbg_printk(MTIP_DRV_NAME "%s: User Command: cmd %x, feat %x, "
1505                 "nsect %x, sect %x, lcyl %x, "
1506                 "hcyl %x, sel %x\n",
1507                 __func__,
1508                 command[0],
1509                 command[1],
1510                 command[2],
1511                 command[3],
1512                 command[4],
1513                 command[5],
1514                 command[6]);
1515
1516         /* Execute the command. */
1517         if (mtip_exec_internal_command(port,
1518                                  &fis,
1519                                  5,
1520                                  0,
1521                                  0,
1522                                  0,
1523                                  GFP_KERNEL,
1524                                  MTIP_IOCTL_COMMAND_TIMEOUT_MS) < 0) {
1525                 return -1;
1526         }
1527
1528         command[0] = reply->command; /* Status*/
1529         command[1] = reply->features; /* Error*/
1530         command[4] = reply->cyl_low;
1531         command[5] = reply->cyl_hi;
1532
1533         dbg_printk(MTIP_DRV_NAME "%s: Completion Status: stat %x, "
1534                 "err %x , cyl_lo %x cyl_hi %x\n",
1535                 __func__,
1536                 command[0],
1537                 command[1],
1538                 command[4],
1539                 command[5]);
1540
1541         return 0;
1542 }
1543
1544 /*
1545  * @brief Execute a drive command.
1546  *
1547  * @param port Pointer to the port data structure.
1548  * @param command Pointer to the user specified command parameters.
1549  * @param user_buffer Pointer to the user space buffer where read sector
1550  *                   data should be copied.
1551  *
1552  * return value 0 The command completed successfully.
1553  * return value -EFAULT An error occurred while copying the completion
1554  *                 data to the user space buffer.
1555  * return value -1 An error occurred while executing the command.
1556  */
1557 static int exec_drive_command(struct mtip_port *port, u8 *command,
1558                                 void __user *user_buffer)
1559 {
1560         struct host_to_dev_fis  fis;
1561         struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
1562
1563         /* Build the FIS. */
1564         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1565         fis.type                = 0x27;
1566         fis.opts                = 1 << 7;
1567         fis.command             = command[0];
1568         fis.features    = command[2];
1569         fis.sect_count  = command[3];
1570         if (fis.command == ATA_CMD_SMART) {
1571                 fis.sector      = command[1];
1572                 fis.cyl_low     = 0x4F;
1573                 fis.cyl_hi      = 0xC2;
1574         }
1575
1576         dbg_printk(MTIP_DRV_NAME
1577                 "%s: User Command: cmd %x, sect %x, "
1578                 "feat %x, sectcnt %x\n",
1579                 __func__,
1580                 command[0],
1581                 command[1],
1582                 command[2],
1583                 command[3]);
1584
1585         memset(port->sector_buffer, 0x00, ATA_SECT_SIZE);
1586
1587         /* Execute the command. */
1588         if (mtip_exec_internal_command(port,
1589                                 &fis,
1590                                  5,
1591                                  port->sector_buffer_dma,
1592                                  (command[3] != 0) ? ATA_SECT_SIZE : 0,
1593                                  0,
1594                                  GFP_KERNEL,
1595                                  MTIP_IOCTL_COMMAND_TIMEOUT_MS)
1596                                  < 0) {
1597                 return -1;
1598         }
1599
1600         /* Collect the completion status. */
1601         command[0] = reply->command; /* Status*/
1602         command[1] = reply->features; /* Error*/
1603         command[2] = command[3];
1604
1605         dbg_printk(MTIP_DRV_NAME
1606                 "%s: Completion Status: stat %x, "
1607                 "err %x, cmd %x\n",
1608                 __func__,
1609                 command[0],
1610                 command[1],
1611                 command[2]);
1612
1613         if (user_buffer && command[3]) {
1614                 if (copy_to_user(user_buffer,
1615                                  port->sector_buffer,
1616                                  ATA_SECT_SIZE * command[3])) {
1617                         return -EFAULT;
1618                 }
1619         }
1620
1621         return 0;
1622 }
1623
1624 /*
1625  *  Indicates whether a command has a single sector payload.
1626  *
1627  *  @command passed to the device to perform the certain event.
1628  *  @features passed to the device to perform the certain event.
1629  *
1630  *  return value
1631  *      1       command is one that always has a single sector payload,
1632  *              regardless of the value in the Sector Count field.
1633  *      0       otherwise
1634  *
1635  */
1636 static unsigned int implicit_sector(unsigned char command,
1637                                     unsigned char features)
1638 {
1639         unsigned int rv = 0;
1640
1641         /* list of commands that have an implicit sector count of 1 */
1642         switch (command) {
1643         case ATA_CMD_SEC_SET_PASS:
1644         case ATA_CMD_SEC_UNLOCK:
1645         case ATA_CMD_SEC_ERASE_PREP:
1646         case ATA_CMD_SEC_ERASE_UNIT:
1647         case ATA_CMD_SEC_FREEZE_LOCK:
1648         case ATA_CMD_SEC_DISABLE_PASS:
1649         case ATA_CMD_PMP_READ:
1650         case ATA_CMD_PMP_WRITE:
1651                 rv = 1;
1652                 break;
1653         case ATA_CMD_SET_MAX:
1654                 if (features == ATA_SET_MAX_UNLOCK)
1655                         rv = 1;
1656                 break;
1657         case ATA_CMD_SMART:
1658                 if ((features == ATA_SMART_READ_VALUES) ||
1659                                 (features == ATA_SMART_READ_THRESHOLDS))
1660                         rv = 1;
1661                 break;
1662         case ATA_CMD_CONF_OVERLAY:
1663                 if ((features == ATA_DCO_IDENTIFY) ||
1664                                 (features == ATA_DCO_SET))
1665                         rv = 1;
1666                 break;
1667         }
1668         return rv;
1669 }
1670
1671 /*
1672  * Executes a taskfile
1673  * See ide_taskfile_ioctl() for derivation
1674  */
1675 static int exec_drive_taskfile(struct driver_data *dd,
1676                                void __user *buf,
1677                                ide_task_request_t *req_task,
1678                                int outtotal)
1679 {
1680         struct host_to_dev_fis  fis;
1681         struct host_to_dev_fis *reply;
1682         u8 *outbuf = NULL;
1683         u8 *inbuf = NULL;
1684         dma_addr_t outbuf_dma = 0;
1685         dma_addr_t inbuf_dma = 0;
1686         dma_addr_t dma_buffer = 0;
1687         int err = 0;
1688         unsigned int taskin = 0;
1689         unsigned int taskout = 0;
1690         u8 nsect = 0;
1691         unsigned int timeout = MTIP_IOCTL_COMMAND_TIMEOUT_MS;
1692         unsigned int force_single_sector;
1693         unsigned int transfer_size;
1694         unsigned long task_file_data;
1695         int intotal = outtotal + req_task->out_size;
1696
1697         taskout = req_task->out_size;
1698         taskin = req_task->in_size;
1699         /* 130560 = 512 * 0xFF*/
1700         if (taskin > 130560 || taskout > 130560) {
1701                 err = -EINVAL;
1702                 goto abort;
1703         }
1704
1705         if (taskout) {
1706                 outbuf = kzalloc(taskout, GFP_KERNEL);
1707                 if (outbuf == NULL) {
1708                         err = -ENOMEM;
1709                         goto abort;
1710                 }
1711                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
1712                         err = -EFAULT;
1713                         goto abort;
1714                 }
1715                 outbuf_dma = pci_map_single(dd->pdev,
1716                                          outbuf,
1717                                          taskout,
1718                                          DMA_TO_DEVICE);
1719                 if (outbuf_dma == 0) {
1720                         err = -ENOMEM;
1721                         goto abort;
1722                 }
1723                 dma_buffer = outbuf_dma;
1724         }
1725
1726         if (taskin) {
1727                 inbuf = kzalloc(taskin, GFP_KERNEL);
1728                 if (inbuf == NULL) {
1729                         err = -ENOMEM;
1730                         goto abort;
1731                 }
1732
1733                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
1734                         err = -EFAULT;
1735                         goto abort;
1736                 }
1737                 inbuf_dma = pci_map_single(dd->pdev,
1738                                          inbuf,
1739                                          taskin, DMA_FROM_DEVICE);
1740                 if (inbuf_dma == 0) {
1741                         err = -ENOMEM;
1742                         goto abort;
1743                 }
1744                 dma_buffer = inbuf_dma;
1745         }
1746
1747         /* only supports PIO and non-data commands from this ioctl. */
1748         switch (req_task->data_phase) {
1749         case TASKFILE_OUT:
1750                 nsect = taskout / ATA_SECT_SIZE;
1751                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
1752                 break;
1753         case TASKFILE_IN:
1754                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
1755                 break;
1756         case TASKFILE_NO_DATA:
1757                 reply = (dd->port->rxfis + RX_FIS_D2H_REG);
1758                 break;
1759         default:
1760                 err = -EINVAL;
1761                 goto abort;
1762         }
1763
1764         /* Build the FIS. */
1765         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1766
1767         fis.type        = 0x27;
1768         fis.opts        = 1 << 7;
1769         fis.command     = req_task->io_ports[7];
1770         fis.features    = req_task->io_ports[1];
1771         fis.sect_count  = req_task->io_ports[2];
1772         fis.lba_low     = req_task->io_ports[3];
1773         fis.lba_mid     = req_task->io_ports[4];
1774         fis.lba_hi      = req_task->io_ports[5];
1775          /* Clear the dev bit*/
1776         fis.device      = req_task->io_ports[6] & ~0x10;
1777
1778         if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
1779                 req_task->in_flags.all  =
1780                         IDE_TASKFILE_STD_IN_FLAGS |
1781                         (IDE_HOB_STD_IN_FLAGS << 8);
1782                 fis.lba_low_ex          = req_task->hob_ports[3];
1783                 fis.lba_mid_ex          = req_task->hob_ports[4];
1784                 fis.lba_hi_ex           = req_task->hob_ports[5];
1785                 fis.features_ex         = req_task->hob_ports[1];
1786                 fis.sect_cnt_ex         = req_task->hob_ports[2];
1787
1788         } else {
1789                 req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
1790         }
1791
1792         force_single_sector = implicit_sector(fis.command, fis.features);
1793
1794         if ((taskin || taskout) && (!fis.sect_count)) {
1795                 if (nsect)
1796                         fis.sect_count = nsect;
1797                 else {
1798                         if (!force_single_sector) {
1799                                 dev_warn(&dd->pdev->dev,
1800                                         "data movement but "
1801                                         "sect_count is 0\n");
1802                                         err = -EINVAL;
1803                                         goto abort;
1804                         }
1805                 }
1806         }
1807
1808         dbg_printk(MTIP_DRV_NAME
1809                 "taskfile: cmd %x, feat %x, nsect %x,"
1810                 " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
1811                 " head/dev %x\n",
1812                 fis.command,
1813                 fis.features,
1814                 fis.sect_count,
1815                 fis.lba_low,
1816                 fis.lba_mid,
1817                 fis.lba_hi,
1818                 fis.device);
1819
1820         switch (fis.command) {
1821         case ATA_CMD_DOWNLOAD_MICRO:
1822                 /* Change timeout for Download Microcode to 60 seconds.*/
1823                 timeout = 60000;
1824                 break;
1825         case ATA_CMD_SEC_ERASE_UNIT:
1826                 /* Change timeout for Security Erase Unit to 4 minutes.*/
1827                 timeout = 240000;
1828                 break;
1829         case ATA_CMD_STANDBYNOW1:
1830                 /* Change timeout for standby immediate to 10 seconds.*/
1831                 timeout = 10000;
1832                 break;
1833         case 0xF7:
1834         case 0xFA:
1835                 /* Change timeout for vendor unique command to 10 secs */
1836                 timeout = 10000;
1837                 break;
1838         case ATA_CMD_SMART:
1839                 /* Change timeout for vendor unique command to 10 secs */
1840                 timeout = 10000;
1841                 break;
1842         default:
1843                 timeout = MTIP_IOCTL_COMMAND_TIMEOUT_MS;
1844                 break;
1845         }
1846
1847         /* Determine the correct transfer size.*/
1848         if (force_single_sector)
1849                 transfer_size = ATA_SECT_SIZE;
1850         else
1851                 transfer_size = ATA_SECT_SIZE * fis.sect_count;
1852
1853         /* Execute the command.*/
1854         if (mtip_exec_internal_command(dd->port,
1855                                  &fis,
1856                                  5,
1857                                  dma_buffer,
1858                                  transfer_size,
1859                                  0,
1860                                  GFP_KERNEL,
1861                                  timeout) < 0) {
1862                 err = -EIO;
1863                 goto abort;
1864         }
1865
1866         task_file_data = readl(dd->port->mmio+PORT_TFDATA);
1867
1868         if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
1869                 reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
1870                 req_task->io_ports[7] = reply->control;
1871         } else {
1872                 reply = dd->port->rxfis + RX_FIS_D2H_REG;
1873                 req_task->io_ports[7] = reply->command;
1874         }
1875
1876         /* reclaim the DMA buffers.*/
1877         if (inbuf_dma)
1878                 pci_unmap_single(dd->pdev, inbuf_dma,
1879                         taskin, DMA_FROM_DEVICE);
1880         if (outbuf_dma)
1881                 pci_unmap_single(dd->pdev, outbuf_dma,
1882                         taskout, DMA_TO_DEVICE);
1883         inbuf_dma  = 0;
1884         outbuf_dma = 0;
1885
1886         /* return the ATA registers to the caller.*/
1887         req_task->io_ports[1] = reply->features;
1888         req_task->io_ports[2] = reply->sect_count;
1889         req_task->io_ports[3] = reply->lba_low;
1890         req_task->io_ports[4] = reply->lba_mid;
1891         req_task->io_ports[5] = reply->lba_hi;
1892         req_task->io_ports[6] = reply->device;
1893
1894         if (req_task->out_flags.all & 1)  {
1895
1896                 req_task->hob_ports[3] = reply->lba_low_ex;
1897                 req_task->hob_ports[4] = reply->lba_mid_ex;
1898                 req_task->hob_ports[5] = reply->lba_hi_ex;
1899                 req_task->hob_ports[1] = reply->features_ex;
1900                 req_task->hob_ports[2] = reply->sect_cnt_ex;
1901         }
1902
1903         /* Com rest after secure erase or lowlevel format */
1904         if (((fis.command == ATA_CMD_SEC_ERASE_UNIT) ||
1905                 ((fis.command == 0xFC) &&
1906                         (fis.features == 0x27 || fis.features == 0x72 ||
1907                          fis.features == 0x62 || fis.features == 0x26))) &&
1908                          !(reply->command & 1)) {
1909                 mtip_restart_port(dd->port);
1910         }
1911
1912         dbg_printk(MTIP_DRV_NAME
1913                 "%s: Completion: stat %x,"
1914                 "err %x, sect_cnt %x, lbalo %x,"
1915                 "lbamid %x, lbahi %x, dev %x\n",
1916                 __func__,
1917                 req_task->io_ports[7],
1918                 req_task->io_ports[1],
1919                 req_task->io_ports[2],
1920                 req_task->io_ports[3],
1921                 req_task->io_ports[4],
1922                 req_task->io_ports[5],
1923                 req_task->io_ports[6]);
1924
1925         if (taskout) {
1926                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
1927                         err = -EFAULT;
1928                         goto abort;
1929                 }
1930         }
1931         if (taskin) {
1932                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
1933                         err = -EFAULT;
1934                         goto abort;
1935                 }
1936         }
1937 abort:
1938         if (inbuf_dma)
1939                 pci_unmap_single(dd->pdev, inbuf_dma,
1940                                         taskin, DMA_FROM_DEVICE);
1941         if (outbuf_dma)
1942                 pci_unmap_single(dd->pdev, outbuf_dma,
1943                                         taskout, DMA_TO_DEVICE);
1944         kfree(outbuf);
1945         kfree(inbuf);
1946
1947         return err;
1948 }
1949
1950 /*
1951  * Handle IOCTL calls from the Block Layer.
1952  *
1953  * This function is called by the Block Layer when it receives an IOCTL
1954  * command that it does not understand. If the IOCTL command is not supported
1955  * this function returns -ENOTTY.
1956  *
1957  * @dd  Pointer to the driver data structure.
1958  * @cmd IOCTL command passed from the Block Layer.
1959  * @arg IOCTL argument passed from the Block Layer.
1960  *
1961  * return value
1962  *      0       The IOCTL completed successfully.
1963  *      -ENOTTY The specified command is not supported.
1964  *      -EFAULT An error occurred copying data to a user space buffer.
1965  *      -EIO    An error occurred while executing the command.
1966  */
1967 static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
1968                          unsigned long arg)
1969 {
1970         switch (cmd) {
1971         case HDIO_GET_IDENTITY:
1972                 if (mtip_get_identify(dd->port, (void __user *) arg) < 0) {
1973                         dev_warn(&dd->pdev->dev,
1974                                 "Unable to read identity\n");
1975                         return -EIO;
1976                 }
1977
1978                 break;
1979         case HDIO_DRIVE_CMD:
1980         {
1981                 u8 drive_command[4];
1982
1983                 /* Copy the user command info to our buffer. */
1984                 if (copy_from_user(drive_command,
1985                                          (void __user *) arg,
1986                                          sizeof(drive_command)))
1987                         return -EFAULT;
1988
1989                 /* Execute the drive command. */
1990                 if (exec_drive_command(dd->port,
1991                                          drive_command,
1992                                          (void __user *) (arg+4)))
1993                         return -EIO;
1994
1995                 /* Copy the status back to the users buffer. */
1996                 if (copy_to_user((void __user *) arg,
1997                                          drive_command,
1998                                          sizeof(drive_command)))
1999                         return -EFAULT;
2000
2001                 break;
2002         }
2003         case HDIO_DRIVE_TASK:
2004         {
2005                 u8 drive_command[7];
2006
2007                 /* Copy the user command info to our buffer. */
2008                 if (copy_from_user(drive_command,
2009                                          (void __user *) arg,
2010                                          sizeof(drive_command)))
2011                         return -EFAULT;
2012
2013                 /* Execute the drive command. */
2014                 if (exec_drive_task(dd->port, drive_command))
2015                         return -EIO;
2016
2017                 /* Copy the status back to the users buffer. */
2018                 if (copy_to_user((void __user *) arg,
2019                                          drive_command,
2020                                          sizeof(drive_command)))
2021                         return -EFAULT;
2022
2023                 break;
2024         }
2025         case HDIO_DRIVE_TASKFILE: {
2026                 ide_task_request_t req_task;
2027                 int ret, outtotal;
2028
2029                 if (copy_from_user(&req_task, (void __user *) arg,
2030                                         sizeof(req_task)))
2031                         return -EFAULT;
2032
2033                 outtotal = sizeof(req_task);
2034
2035                 ret = exec_drive_taskfile(dd, (void __user *) arg,
2036                                                 &req_task, outtotal);
2037
2038                 if (copy_to_user((void __user *) arg, &req_task,
2039                                                         sizeof(req_task)))
2040                         return -EFAULT;
2041
2042                 return ret;
2043         }
2044
2045         default:
2046                 return -EINVAL;
2047         }
2048         return 0;
2049 }
2050
2051 /*
2052  * Submit an IO to the hw
2053  *
2054  * This function is called by the block layer to issue an io
2055  * to the device. Upon completion, the callback function will
2056  * be called with the data parameter passed as the callback data.
2057  *
2058  * @dd       Pointer to the driver data structure.
2059  * @start    First sector to read.
2060  * @nsect    Number of sectors to read.
2061  * @nents    Number of entries in scatter list for the read command.
2062  * @tag      The tag of this read command.
2063  * @callback Pointer to the function that should be called
2064  *           when the read completes.
2065  * @data     Callback data passed to the callback function
2066  *           when the read completes.
2067  * @barrier  If non-zero, this command must be completed before
2068  *           issuing any other commands.
2069  * @dir      Direction (read or write)
2070  *
2071  * return value
2072  *      None
2073  */
2074 static void mtip_hw_submit_io(struct driver_data *dd, sector_t start,
2075                               int nsect, int nents, int tag, void *callback,
2076                               void *data, int barrier, int dir)
2077 {
2078         struct host_to_dev_fis  *fis;
2079         struct mtip_port *port = dd->port;
2080         struct mtip_cmd *command = &port->commands[tag];
2081
2082         /* Map the scatter list for DMA access */
2083         if (dir == READ)
2084                 nents = dma_map_sg(&dd->pdev->dev, command->sg,
2085                                         nents, DMA_FROM_DEVICE);
2086         else
2087                 nents = dma_map_sg(&dd->pdev->dev, command->sg,
2088                                         nents, DMA_TO_DEVICE);
2089
2090         command->scatter_ents = nents;
2091
2092         /*
2093          * The number of retries for this command before it is
2094          * reported as a failure to the upper layers.
2095          */
2096         command->retries = MTIP_MAX_RETRIES;
2097
2098         /* Fill out fis */
2099         fis = command->command;
2100         fis->type        = 0x27;
2101         fis->opts        = 1 << 7;
2102         fis->command     =
2103                 (dir == READ ? ATA_CMD_FPDMA_READ : ATA_CMD_FPDMA_WRITE);
2104         *((unsigned int *) &fis->lba_low) = (start & 0xFFFFFF);
2105         *((unsigned int *) &fis->lba_low_ex) = ((start >> 24) & 0xFFFFFF);
2106         fis->device      = 1 << 6;
2107         if (barrier)
2108                 fis->device |= FUA_BIT;
2109         fis->features    = nsect & 0xFF;
2110         fis->features_ex = (nsect >> 8) & 0xFF;
2111         fis->sect_count  = ((tag << 3) | (tag >> 5));
2112         fis->sect_cnt_ex = 0;
2113         fis->control     = 0;
2114         fis->res2        = 0;
2115         fis->res3        = 0;
2116         fill_command_sg(dd, command, nents);
2117
2118         /* Populate the command header */
2119         command->command_header->opts =
2120                         __force_bit2int cpu_to_le32(
2121                                 (nents << 16) | 5 | AHCI_CMD_PREFETCH);
2122         command->command_header->byte_count = 0;
2123
2124         /*
2125          * Set the completion function and data for the command
2126          * within this layer.
2127          */
2128         command->comp_data = dd;
2129         command->comp_func = mtip_async_complete;
2130         command->direction = (dir == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
2131
2132         /*
2133          * Set the completion function and data for the command passed
2134          * from the upper layer.
2135          */
2136         command->async_data = data;
2137         command->async_callback = callback;
2138
2139         /*
2140          * To prevent this command from being issued
2141          * if an internal command is in progress or error handling is active.
2142          */
2143         if (unlikely(test_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags) ||
2144                         test_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags))) {
2145                 set_bit(tag, port->cmds_to_issue);
2146                 set_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags);
2147                 return;
2148         }
2149
2150         /* Issue the command to the hardware */
2151         mtip_issue_ncq_command(port, tag);
2152
2153         /* Set the command's timeout value.*/
2154         port->commands[tag].comp_time = jiffies + msecs_to_jiffies(
2155                                         MTIP_NCQ_COMMAND_TIMEOUT_MS);
2156 }
2157
2158 /*
2159  * Release a command slot.
2160  *
2161  * @dd  Pointer to the driver data structure.
2162  * @tag Slot tag
2163  *
2164  * return value
2165  *      None
2166  */
2167 static void mtip_hw_release_scatterlist(struct driver_data *dd, int tag)
2168 {
2169         release_slot(dd->port, tag);
2170 }
2171
2172 /*
2173  * Obtain a command slot and return its associated scatter list.
2174  *
2175  * @dd  Pointer to the driver data structure.
2176  * @tag Pointer to an int that will receive the allocated command
2177  *            slot tag.
2178  *
2179  * return value
2180  *      Pointer to the scatter list for the allocated command slot
2181  *      or NULL if no command slots are available.
2182  */
2183 static struct scatterlist *mtip_hw_get_scatterlist(struct driver_data *dd,
2184                                                    int *tag)
2185 {
2186         /*
2187          * It is possible that, even with this semaphore, a thread
2188          * may think that no command slots are available. Therefore, we
2189          * need to make an attempt to get_slot().
2190          */
2191         down(&dd->port->cmd_slot);
2192         *tag = get_slot(dd->port);
2193
2194         if (unlikely(*tag < 0))
2195                 return NULL;
2196
2197         return dd->port->commands[*tag].sg;
2198 }
2199
2200 /*
2201  * Sysfs register/status dump.
2202  *
2203  * @dev  Pointer to the device structure, passed by the kernrel.
2204  * @attr Pointer to the device_attribute structure passed by the kernel.
2205  * @buf  Pointer to the char buffer that will receive the stats info.
2206  *
2207  * return value
2208  *      The size, in bytes, of the data copied into buf.
2209  */
2210 static ssize_t hw_show_registers(struct device *dev,
2211                                 struct device_attribute *attr,
2212                                 char *buf)
2213 {
2214         u32 group_allocated;
2215         struct driver_data *dd = dev_to_disk(dev)->private_data;
2216         int size = 0;
2217         int n;
2218
2219         size += sprintf(&buf[size], "%s:\ns_active:\n", __func__);
2220
2221         for (n = 0; n < dd->slot_groups; n++)
2222                 size += sprintf(&buf[size], "0x%08x\n",
2223                                          readl(dd->port->s_active[n]));
2224
2225         size += sprintf(&buf[size], "Command Issue:\n");
2226
2227         for (n = 0; n < dd->slot_groups; n++)
2228                 size += sprintf(&buf[size], "0x%08x\n",
2229                                         readl(dd->port->cmd_issue[n]));
2230
2231         size += sprintf(&buf[size], "Allocated:\n");
2232
2233         for (n = 0; n < dd->slot_groups; n++) {
2234                 if (sizeof(long) > sizeof(u32))
2235                         group_allocated =
2236                                 dd->port->allocated[n/2] >> (32*(n&1));
2237                 else
2238                         group_allocated = dd->port->allocated[n];
2239                 size += sprintf(&buf[size], "0x%08x\n",
2240                                  group_allocated);
2241         }
2242
2243         size += sprintf(&buf[size], "completed:\n");
2244
2245         for (n = 0; n < dd->slot_groups; n++)
2246                 size += sprintf(&buf[size], "0x%08x\n",
2247                                 readl(dd->port->completed[n]));
2248
2249         size += sprintf(&buf[size], "PORT_IRQ_STAT 0x%08x\n",
2250                                 readl(dd->port->mmio + PORT_IRQ_STAT));
2251         size += sprintf(&buf[size], "HOST_IRQ_STAT 0x%08x\n",
2252                                 readl(dd->mmio + HOST_IRQ_STAT));
2253
2254         return size;
2255 }
2256 static DEVICE_ATTR(registers, S_IRUGO, hw_show_registers, NULL);
2257
2258 /*
2259  * Create the sysfs related attributes.
2260  *
2261  * @dd   Pointer to the driver data structure.
2262  * @kobj Pointer to the kobj for the block device.
2263  *
2264  * return value
2265  *      0       Operation completed successfully.
2266  *      -EINVAL Invalid parameter.
2267  */
2268 static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
2269 {
2270         if (!kobj || !dd)
2271                 return -EINVAL;
2272
2273         if (sysfs_create_file(kobj, &dev_attr_registers.attr))
2274                 dev_warn(&dd->pdev->dev,
2275                         "Error creating registers sysfs entry\n");
2276         return 0;
2277 }
2278
2279 /*
2280  * Remove the sysfs related attributes.
2281  *
2282  * @dd   Pointer to the driver data structure.
2283  * @kobj Pointer to the kobj for the block device.
2284  *
2285  * return value
2286  *      0       Operation completed successfully.
2287  *      -EINVAL Invalid parameter.
2288  */
2289 static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
2290 {
2291         if (!kobj || !dd)
2292                 return -EINVAL;
2293
2294         sysfs_remove_file(kobj, &dev_attr_registers.attr);
2295
2296         return 0;
2297 }
2298
2299 /*
2300  * Perform any init/resume time hardware setup
2301  *
2302  * @dd Pointer to the driver data structure.
2303  *
2304  * return value
2305  *      None
2306  */
2307 static inline void hba_setup(struct driver_data *dd)
2308 {
2309         u32 hwdata;
2310         hwdata = readl(dd->mmio + HOST_HSORG);
2311
2312         /* interrupt bug workaround: use only 1 IS bit.*/
2313         writel(hwdata |
2314                 HSORG_DISABLE_SLOTGRP_INTR |
2315                 HSORG_DISABLE_SLOTGRP_PXIS,
2316                 dd->mmio + HOST_HSORG);
2317 }
2318
2319 /*
2320  * Detect the details of the product, and store anything needed
2321  * into the driver data structure.  This includes product type and
2322  * version and number of slot groups.
2323  *
2324  * @dd Pointer to the driver data structure.
2325  *
2326  * return value
2327  *      None
2328  */
2329 static void mtip_detect_product(struct driver_data *dd)
2330 {
2331         u32 hwdata;
2332         unsigned int rev, slotgroups;
2333
2334         /*
2335          * HBA base + 0xFC [15:0] - vendor-specific hardware interface
2336          * info register:
2337          * [15:8] hardware/software interface rev#
2338          * [   3] asic-style interface
2339          * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
2340          */
2341         hwdata = readl(dd->mmio + HOST_HSORG);
2342
2343         dd->product_type = MTIP_PRODUCT_UNKNOWN;
2344         dd->slot_groups = 1;
2345
2346         if (hwdata & 0x8) {
2347                 dd->product_type = MTIP_PRODUCT_ASICFPGA;
2348                 rev = (hwdata & HSORG_HWREV) >> 8;
2349                 slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
2350                 dev_info(&dd->pdev->dev,
2351                         "ASIC-FPGA design, HS rev 0x%x, "
2352                         "%i slot groups [%i slots]\n",
2353                          rev,
2354                          slotgroups,
2355                          slotgroups * 32);
2356
2357                 if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
2358                         dev_warn(&dd->pdev->dev,
2359                                 "Warning: driver only supports "
2360                                 "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
2361                         slotgroups = MTIP_MAX_SLOT_GROUPS;
2362                 }
2363                 dd->slot_groups = slotgroups;
2364                 return;
2365         }
2366
2367         dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
2368 }
2369
2370 /*
2371  * Blocking wait for FTL rebuild to complete
2372  *
2373  * @dd Pointer to the DRIVER_DATA structure.
2374  *
2375  * return value
2376  *      0       FTL rebuild completed successfully
2377  *      -EFAULT FTL rebuild error/timeout/interruption
2378  */
2379 static int mtip_ftl_rebuild_poll(struct driver_data *dd)
2380 {
2381         unsigned long timeout, cnt = 0, start;
2382
2383         dev_warn(&dd->pdev->dev,
2384                 "FTL rebuild in progress. Polling for completion.\n");
2385
2386         start = jiffies;
2387         dd->ftlrebuildflag = 1;
2388         timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
2389
2390         do {
2391                 if (mtip_check_surprise_removal(dd->pdev))
2392                         return -EFAULT;
2393
2394                 if (mtip_get_identify(dd->port, NULL) < 0)
2395                         return -EFAULT;
2396
2397                 if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2398                         MTIP_FTL_REBUILD_MAGIC) {
2399                         ssleep(1);
2400                         /* Print message every 3 minutes */
2401                         if (cnt++ >= 180) {
2402                                 dev_warn(&dd->pdev->dev,
2403                                 "FTL rebuild in progress (%d secs).\n",
2404                                 jiffies_to_msecs(jiffies - start) / 1000);
2405                                 cnt = 0;
2406                         }
2407                 } else {
2408                         dev_warn(&dd->pdev->dev,
2409                                 "FTL rebuild complete (%d secs).\n",
2410                         jiffies_to_msecs(jiffies - start) / 1000);
2411                         dd->ftlrebuildflag = 0;
2412                         break;
2413                 }
2414                 ssleep(10);
2415         } while (time_before(jiffies, timeout));
2416
2417         /* Check for timeout */
2418         if (dd->ftlrebuildflag) {
2419                 dev_err(&dd->pdev->dev,
2420                 "Timed out waiting for FTL rebuild to complete (%d secs).\n",
2421                 jiffies_to_msecs(jiffies - start) / 1000);
2422                 return -EFAULT;
2423         }
2424
2425         return 0;
2426 }
2427
2428 /*
2429  * service thread to issue queued commands
2430  *
2431  * @data Pointer to the driver data structure.
2432  *
2433  * return value
2434  *      0
2435  */
2436
2437 static int mtip_service_thread(void *data)
2438 {
2439         struct driver_data *dd = (struct driver_data *)data;
2440         unsigned long slot, slot_start, slot_wrap;
2441         unsigned int num_cmd_slots = dd->slot_groups * 32;
2442         struct mtip_port *port = dd->port;
2443
2444         while (1) {
2445                 /*
2446                  * the condition is to check neither an internal command is
2447                  * is in progress nor error handling is active
2448                  */
2449                 wait_event_interruptible(port->svc_wait, (port->flags) &&
2450                         !test_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags) &&
2451                         !test_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags));
2452
2453                 if (kthread_should_stop())
2454                         break;
2455
2456                 if (test_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags)) {
2457                         set_bit(MTIP_FLAG_SVC_THD_ACTIVE_BIT, &port->flags);
2458                         slot = 1;
2459                         /* used to restrict the loop to one iteration */
2460                         slot_start = num_cmd_slots;
2461                         slot_wrap = 0;
2462                         while (1) {
2463                                 slot = find_next_bit(port->cmds_to_issue,
2464                                                 num_cmd_slots, slot);
2465                                 if (slot_wrap == 1) {
2466                                         if ((slot_start >= slot) ||
2467                                                 (slot >= num_cmd_slots))
2468                                                 break;
2469                                 }
2470                                 if (unlikely(slot_start == num_cmd_slots))
2471                                         slot_start = slot;
2472
2473                                 if (unlikely(slot == num_cmd_slots)) {
2474                                         slot = 1;
2475                                         slot_wrap = 1;
2476                                         continue;
2477                                 }
2478
2479                                 /* Issue the command to the hardware */
2480                                 mtip_issue_ncq_command(port, slot);
2481
2482                                 /* Set the command's timeout value.*/
2483                                 port->commands[slot].comp_time = jiffies +
2484                                 msecs_to_jiffies(MTIP_NCQ_COMMAND_TIMEOUT_MS);
2485
2486                                 clear_bit(slot, port->cmds_to_issue);
2487                         }
2488
2489                         clear_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags);
2490                         clear_bit(MTIP_FLAG_SVC_THD_ACTIVE_BIT, &port->flags);
2491                 }
2492         }
2493         return 0;
2494 }
2495
2496 /*
2497  * Called once for each card.
2498  *
2499  * @dd Pointer to the driver data structure.
2500  *
2501  * return value
2502  *      0 on success, else an error code.
2503  */
2504 static int mtip_hw_init(struct driver_data *dd)
2505 {
2506         int i;
2507         int rv;
2508         unsigned int num_command_slots;
2509
2510         dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
2511
2512         mtip_detect_product(dd);
2513         if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
2514                 rv = -EIO;
2515                 goto out1;
2516         }
2517         num_command_slots = dd->slot_groups * 32;
2518
2519         hba_setup(dd);
2520
2521         tasklet_init(&dd->tasklet, mtip_tasklet, (unsigned long)dd);
2522
2523         dd->port = kzalloc(sizeof(struct mtip_port), GFP_KERNEL);
2524         if (!dd->port) {
2525                 dev_err(&dd->pdev->dev,
2526                         "Memory allocation: port structure\n");
2527                 return -ENOMEM;
2528         }
2529
2530         /* Counting semaphore to track command slot usage */
2531         sema_init(&dd->port->cmd_slot, num_command_slots - 1);
2532
2533         /* Spinlock to prevent concurrent issue */
2534         spin_lock_init(&dd->port->cmd_issue_lock);
2535
2536         /* Set the port mmio base address. */
2537         dd->port->mmio  = dd->mmio + PORT_OFFSET;
2538         dd->port->dd    = dd;
2539
2540         /* Allocate memory for the command list. */
2541         dd->port->command_list =
2542                 dmam_alloc_coherent(&dd->pdev->dev,
2543                         HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2),
2544                         &dd->port->command_list_dma,
2545                         GFP_KERNEL);
2546         if (!dd->port->command_list) {
2547                 dev_err(&dd->pdev->dev,
2548                         "Memory allocation: command list\n");
2549                 rv = -ENOMEM;
2550                 goto out1;
2551         }
2552
2553         /* Clear the memory we have allocated. */
2554         memset(dd->port->command_list,
2555                 0,
2556                 HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2));
2557
2558         /* Setup the addresse of the RX FIS. */
2559         dd->port->rxfis     = dd->port->command_list + HW_CMD_SLOT_SZ;
2560         dd->port->rxfis_dma = dd->port->command_list_dma + HW_CMD_SLOT_SZ;
2561
2562         /* Setup the address of the command tables. */
2563         dd->port->command_table   = dd->port->rxfis + AHCI_RX_FIS_SZ;
2564         dd->port->command_tbl_dma = dd->port->rxfis_dma + AHCI_RX_FIS_SZ;
2565
2566         /* Setup the address of the identify data. */
2567         dd->port->identify     = dd->port->command_table +
2568                                         HW_CMD_TBL_AR_SZ;
2569         dd->port->identify_dma = dd->port->command_tbl_dma +
2570                                         HW_CMD_TBL_AR_SZ;
2571
2572         /* Setup the address of the sector buffer. */
2573         dd->port->sector_buffer = (void *) dd->port->identify + ATA_SECT_SIZE;
2574         dd->port->sector_buffer_dma = dd->port->identify_dma + ATA_SECT_SIZE;
2575
2576         /* Point the command headers at the command tables. */
2577         for (i = 0; i < num_command_slots; i++) {
2578                 dd->port->commands[i].command_header =
2579                                         dd->port->command_list +
2580                                         (sizeof(struct mtip_cmd_hdr) * i);
2581                 dd->port->commands[i].command_header_dma =
2582                                         dd->port->command_list_dma +
2583                                         (sizeof(struct mtip_cmd_hdr) * i);
2584
2585                 dd->port->commands[i].command =
2586                         dd->port->command_table + (HW_CMD_TBL_SZ * i);
2587                 dd->port->commands[i].command_dma =
2588                         dd->port->command_tbl_dma + (HW_CMD_TBL_SZ * i);
2589
2590                 if (readl(dd->mmio + HOST_CAP) & HOST_CAP_64)
2591                         dd->port->commands[i].command_header->ctbau =
2592                         __force_bit2int cpu_to_le32(
2593                         (dd->port->commands[i].command_dma >> 16) >> 16);
2594                 dd->port->commands[i].command_header->ctba =
2595                         __force_bit2int cpu_to_le32(
2596                         dd->port->commands[i].command_dma & 0xFFFFFFFF);
2597
2598                 /*
2599                  * If this is not done, a bug is reported by the stock
2600                  * FC11 i386. Due to the fact that it has lots of kernel
2601                  * debugging enabled.
2602                  */
2603                 sg_init_table(dd->port->commands[i].sg, MTIP_MAX_SG);
2604
2605                 /* Mark all commands as currently inactive.*/
2606                 atomic_set(&dd->port->commands[i].active, 0);
2607         }
2608
2609         /* Setup the pointers to the extended s_active and CI registers. */
2610         for (i = 0; i < dd->slot_groups; i++) {
2611                 dd->port->s_active[i] =
2612                         dd->port->mmio + i*0x80 + PORT_SCR_ACT;
2613                 dd->port->cmd_issue[i] =
2614                         dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
2615                 dd->port->completed[i] =
2616                         dd->port->mmio + i*0x80 + PORT_SDBV;
2617         }
2618
2619         /* Reset the HBA. */
2620         if (mtip_hba_reset(dd) < 0) {
2621                 dev_err(&dd->pdev->dev,
2622                         "Card did not reset within timeout\n");
2623                 rv = -EIO;
2624                 goto out2;
2625         }
2626
2627         mtip_init_port(dd->port);
2628         mtip_start_port(dd->port);
2629
2630         /* Setup the ISR and enable interrupts. */
2631         rv = devm_request_irq(&dd->pdev->dev,
2632                                 dd->pdev->irq,
2633                                 mtip_irq_handler,
2634                                 IRQF_SHARED,
2635                                 dev_driver_string(&dd->pdev->dev),
2636                                 dd);
2637
2638         if (rv) {
2639                 dev_err(&dd->pdev->dev,
2640                         "Unable to allocate IRQ %d\n", dd->pdev->irq);
2641                 goto out2;
2642         }
2643
2644         /* Enable interrupts on the HBA. */
2645         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
2646                                         dd->mmio + HOST_CTL);
2647
2648         init_timer(&dd->port->cmd_timer);
2649         init_waitqueue_head(&dd->port->svc_wait);
2650
2651         dd->port->cmd_timer.data = (unsigned long int) dd->port;
2652         dd->port->cmd_timer.function = mtip_timeout_function;
2653         mod_timer(&dd->port->cmd_timer,
2654                 jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
2655
2656         if (mtip_get_identify(dd->port, NULL) < 0) {
2657                 rv = -EFAULT;
2658                 goto out3;
2659         }
2660         mtip_dump_identify(dd->port);
2661
2662         if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2663                 MTIP_FTL_REBUILD_MAGIC) {
2664                 return mtip_ftl_rebuild_poll(dd);
2665         }
2666         return rv;
2667
2668 out3:
2669         del_timer_sync(&dd->port->cmd_timer);
2670
2671         /* Disable interrupts on the HBA. */
2672         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
2673                         dd->mmio + HOST_CTL);
2674
2675         /*Release the IRQ. */
2676         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
2677
2678 out2:
2679         mtip_deinit_port(dd->port);
2680
2681         /* Free the command/command header memory. */
2682         dmam_free_coherent(&dd->pdev->dev,
2683                                 HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2),
2684                                 dd->port->command_list,
2685                                 dd->port->command_list_dma);
2686 out1:
2687         /* Free the memory allocated for the for structure. */
2688         kfree(dd->port);
2689
2690         return rv;
2691 }
2692
2693 /*
2694  * Called to deinitialize an interface.
2695  *
2696  * @dd Pointer to the driver data structure.
2697  *
2698  * return value
2699  *      0
2700  */
2701 static int mtip_hw_exit(struct driver_data *dd)
2702 {
2703         /*
2704          * Send standby immediate (E0h) to the drive so that it
2705          * saves its state.
2706          */
2707         if (atomic_read(&dd->drv_cleanup_done) != true) {
2708
2709                 mtip_standby_immediate(dd->port);
2710
2711                 /* de-initialize the port. */
2712                 mtip_deinit_port(dd->port);
2713
2714                 /* Disable interrupts on the HBA. */
2715                 writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
2716                                 dd->mmio + HOST_CTL);
2717         }
2718
2719         del_timer_sync(&dd->port->cmd_timer);
2720
2721         /* Release the IRQ. */
2722         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
2723
2724         /* Stop the bottom half tasklet. */
2725         tasklet_kill(&dd->tasklet);
2726
2727         /* Free the command/command header memory. */
2728         dmam_free_coherent(&dd->pdev->dev,
2729                         HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2),
2730                         dd->port->command_list,
2731                         dd->port->command_list_dma);
2732         /* Free the memory allocated for the for structure. */
2733         kfree(dd->port);
2734
2735         return 0;
2736 }
2737
2738 /*
2739  * Issue a Standby Immediate command to the device.
2740  *
2741  * This function is called by the Block Layer just before the
2742  * system powers off during a shutdown.
2743  *
2744  * @dd Pointer to the driver data structure.
2745  *
2746  * return value
2747  *      0
2748  */
2749 static int mtip_hw_shutdown(struct driver_data *dd)
2750 {
2751         /*
2752          * Send standby immediate (E0h) to the drive so that it
2753          * saves its state.
2754          */
2755         mtip_standby_immediate(dd->port);
2756
2757         return 0;
2758 }
2759
2760 /*
2761  * Suspend function
2762  *
2763  * This function is called by the Block Layer just before the
2764  * system hibernates.
2765  *
2766  * @dd Pointer to the driver data structure.
2767  *
2768  * return value
2769  *      0       Suspend was successful
2770  *      -EFAULT Suspend was not successful
2771  */
2772 static int mtip_hw_suspend(struct driver_data *dd)
2773 {
2774         /*
2775          * Send standby immediate (E0h) to the drive
2776          * so that it saves its state.
2777          */
2778         if (mtip_standby_immediate(dd->port) != 0) {
2779                 dev_err(&dd->pdev->dev,
2780                         "Failed standby-immediate command\n");
2781                 return -EFAULT;
2782         }
2783
2784         /* Disable interrupts on the HBA.*/
2785         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
2786                         dd->mmio + HOST_CTL);
2787         mtip_deinit_port(dd->port);
2788
2789         return 0;
2790 }
2791
2792 /*
2793  * Resume function
2794  *
2795  * This function is called by the Block Layer as the
2796  * system resumes.
2797  *
2798  * @dd Pointer to the driver data structure.
2799  *
2800  * return value
2801  *      0       Resume was successful
2802  *      -EFAULT Resume was not successful
2803  */
2804 static int mtip_hw_resume(struct driver_data *dd)
2805 {
2806         /* Perform any needed hardware setup steps */
2807         hba_setup(dd);
2808
2809         /* Reset the HBA */
2810         if (mtip_hba_reset(dd) != 0) {
2811                 dev_err(&dd->pdev->dev,
2812                         "Unable to reset the HBA\n");
2813                 return -EFAULT;
2814         }
2815
2816         /*
2817          * Enable the port, DMA engine, and FIS reception specific
2818          * h/w in controller.
2819          */
2820         mtip_init_port(dd->port);
2821         mtip_start_port(dd->port);
2822
2823         /* Enable interrupts on the HBA.*/
2824         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
2825                         dd->mmio + HOST_CTL);
2826
2827         return 0;
2828 }
2829
2830 /*
2831  * Helper function for reusing disk name
2832  * upon hot insertion.
2833  */
2834 static int rssd_disk_name_format(char *prefix,
2835                                  int index,
2836                                  char *buf,
2837                                  int buflen)
2838 {
2839         const int base = 'z' - 'a' + 1;
2840         char *begin = buf + strlen(prefix);
2841         char *end = buf + buflen;
2842         char *p;
2843         int unit;
2844
2845         p = end - 1;
2846         *p = '\0';
2847         unit = base;
2848         do {
2849                 if (p == begin)
2850                         return -EINVAL;
2851                 *--p = 'a' + (index % unit);
2852                 index = (index / unit) - 1;
2853         } while (index >= 0);
2854
2855         memmove(begin, p, end - p);
2856         memcpy(buf, prefix, strlen(prefix));
2857
2858         return 0;
2859 }
2860
2861 /*
2862  * Block layer IOCTL handler.
2863  *
2864  * @dev Pointer to the block_device structure.
2865  * @mode ignored
2866  * @cmd IOCTL command passed from the user application.
2867  * @arg Argument passed from the user application.
2868  *
2869  * return value
2870  *      0        IOCTL completed successfully.
2871  *      -ENOTTY  IOCTL not supported or invalid driver data
2872  *                 structure pointer.
2873  */
2874 static int mtip_block_ioctl(struct block_device *dev,
2875                             fmode_t mode,
2876                             unsigned cmd,
2877                             unsigned long arg)
2878 {
2879         struct driver_data *dd = dev->bd_disk->private_data;
2880
2881         if (!capable(CAP_SYS_ADMIN))
2882                 return -EACCES;
2883
2884         if (!dd)
2885                 return -ENOTTY;
2886
2887         switch (cmd) {
2888         case BLKFLSBUF:
2889                 return -ENOTTY;
2890         default:
2891                 return mtip_hw_ioctl(dd, cmd, arg);
2892         }
2893 }
2894
2895 #ifdef CONFIG_COMPAT
2896 /*
2897  * Block layer compat IOCTL handler.
2898  *
2899  * @dev Pointer to the block_device structure.
2900  * @mode ignored
2901  * @cmd IOCTL command passed from the user application.
2902  * @arg Argument passed from the user application.
2903  *
2904  * return value
2905  *      0        IOCTL completed successfully.
2906  *      -ENOTTY  IOCTL not supported or invalid driver data
2907  *                 structure pointer.
2908  */
2909 static int mtip_block_compat_ioctl(struct block_device *dev,
2910                             fmode_t mode,
2911                             unsigned cmd,
2912                             unsigned long arg)
2913 {
2914         struct driver_data *dd = dev->bd_disk->private_data;
2915
2916         if (!capable(CAP_SYS_ADMIN))
2917                 return -EACCES;
2918
2919         if (!dd)
2920                 return -ENOTTY;
2921
2922         switch (cmd) {
2923         case BLKFLSBUF:
2924                 return -ENOTTY;
2925         case HDIO_DRIVE_TASKFILE: {
2926                 struct mtip_compat_ide_task_request_s __user *compat_req_task;
2927                 ide_task_request_t req_task;
2928                 int compat_tasksize, outtotal, ret;
2929
2930                 compat_tasksize =
2931                         sizeof(struct mtip_compat_ide_task_request_s);
2932
2933                 compat_req_task =
2934                         (struct mtip_compat_ide_task_request_s __user *) arg;
2935
2936                 if (copy_from_user(&req_task, (void __user *) arg,
2937                         compat_tasksize - (2 * sizeof(compat_long_t))))
2938                         return -EFAULT;
2939
2940                 if (get_user(req_task.out_size, &compat_req_task->out_size))
2941                         return -EFAULT;
2942
2943                 if (get_user(req_task.in_size, &compat_req_task->in_size))
2944                         return -EFAULT;
2945
2946                 outtotal = sizeof(struct mtip_compat_ide_task_request_s);
2947
2948                 ret = exec_drive_taskfile(dd, (void __user *) arg,
2949                                                 &req_task, outtotal);
2950
2951                 if (copy_to_user((void __user *) arg, &req_task,
2952                                 compat_tasksize -
2953                                 (2 * sizeof(compat_long_t))))
2954                         return -EFAULT;
2955
2956                 if (put_user(req_task.out_size, &compat_req_task->out_size))
2957                         return -EFAULT;
2958
2959                 if (put_user(req_task.in_size, &compat_req_task->in_size))
2960                         return -EFAULT;
2961
2962                 return ret;
2963         }
2964         default:
2965                 return mtip_hw_ioctl(dd, cmd, arg);
2966         }
2967 }
2968 #endif
2969
2970 /*
2971  * Obtain the geometry of the device.
2972  *
2973  * You may think that this function is obsolete, but some applications,
2974  * fdisk for example still used CHS values. This function describes the
2975  * device as having 224 heads and 56 sectors per cylinder. These values are
2976  * chosen so that each cylinder is aligned on a 4KB boundary. Since a
2977  * partition is described in terms of a start and end cylinder this means
2978  * that each partition is also 4KB aligned. Non-aligned partitions adversely
2979  * affects performance.
2980  *
2981  * @dev Pointer to the block_device strucutre.
2982  * @geo Pointer to a hd_geometry structure.
2983  *
2984  * return value
2985  *      0       Operation completed successfully.
2986  *      -ENOTTY An error occurred while reading the drive capacity.
2987  */
2988 static int mtip_block_getgeo(struct block_device *dev,
2989                                 struct hd_geometry *geo)
2990 {
2991         struct driver_data *dd = dev->bd_disk->private_data;
2992         sector_t capacity;
2993
2994         if (!dd)
2995                 return -ENOTTY;
2996
2997         if (!(mtip_hw_get_capacity(dd, &capacity))) {
2998                 dev_warn(&dd->pdev->dev,
2999                         "Could not get drive capacity.\n");
3000                 return -ENOTTY;
3001         }
3002
3003         geo->heads = 224;
3004         geo->sectors = 56;
3005         sector_div(capacity, (geo->heads * geo->sectors));
3006         geo->cylinders = capacity;
3007         return 0;
3008 }
3009
3010 /*
3011  * Block device operation function.
3012  *
3013  * This structure contains pointers to the functions required by the block
3014  * layer.
3015  */
3016 static const struct block_device_operations mtip_block_ops = {
3017         .ioctl          = mtip_block_ioctl,
3018 #ifdef CONFIG_COMPAT
3019         .compat_ioctl   = mtip_block_compat_ioctl,
3020 #endif
3021         .getgeo         = mtip_block_getgeo,
3022         .owner          = THIS_MODULE
3023 };
3024
3025 /*
3026  * Block layer make request function.
3027  *
3028  * This function is called by the kernel to process a BIO for
3029  * the P320 device.
3030  *
3031  * @queue Pointer to the request queue. Unused other than to obtain
3032  *              the driver data structure.
3033  * @bio   Pointer to the BIO.
3034  *
3035  */
3036 static void mtip_make_request(struct request_queue *queue, struct bio *bio)
3037 {
3038         struct driver_data *dd = queue->queuedata;
3039         struct scatterlist *sg;
3040         struct bio_vec *bvec;
3041         int nents = 0;
3042         int tag = 0;
3043
3044         if (unlikely(!bio_has_data(bio))) {
3045                 blk_queue_flush(queue, 0);
3046                 bio_endio(bio, 0);
3047                 return;
3048         }
3049
3050         sg = mtip_hw_get_scatterlist(dd, &tag);
3051         if (likely(sg != NULL)) {
3052                 blk_queue_bounce(queue, &bio);
3053
3054                 if (unlikely((bio)->bi_vcnt > MTIP_MAX_SG)) {
3055                         dev_warn(&dd->pdev->dev,
3056                                 "Maximum number of SGL entries exceeded");
3057                         bio_io_error(bio);
3058                         mtip_hw_release_scatterlist(dd, tag);
3059                         return;
3060                 }
3061
3062                 /* Create the scatter list for this bio. */
3063                 bio_for_each_segment(bvec, bio, nents) {
3064                         sg_set_page(&sg[nents],
3065                                         bvec->bv_page,
3066                                         bvec->bv_len,
3067                                         bvec->bv_offset);
3068                 }
3069
3070                 /* Issue the read/write. */
3071                 mtip_hw_submit_io(dd,
3072                                 bio->bi_sector,
3073                                 bio_sectors(bio),
3074                                 nents,
3075                                 tag,
3076                                 bio_endio,
3077                                 bio,
3078                                 bio->bi_rw & REQ_FUA,
3079                                 bio_data_dir(bio));
3080         } else
3081                 bio_io_error(bio);
3082 }
3083
3084 /*
3085  * Block layer initialization function.
3086  *
3087  * This function is called once by the PCI layer for each P320
3088  * device that is connected to the system.
3089  *
3090  * @dd Pointer to the driver data structure.
3091  *
3092  * return value
3093  *      0 on success else an error code.
3094  */
3095 static int mtip_block_initialize(struct driver_data *dd)
3096 {
3097         int rv = 0;
3098         sector_t capacity;
3099         unsigned int index = 0;
3100         struct kobject *kobj;
3101         unsigned char thd_name[16];
3102
3103         /* Initialize the protocol layer. */
3104         rv = mtip_hw_init(dd);
3105         if (rv < 0) {
3106                 dev_err(&dd->pdev->dev,
3107                         "Protocol layer initialization failed\n");
3108                 rv = -EINVAL;
3109                 goto protocol_init_error;
3110         }
3111
3112         /* Allocate the request queue. */
3113         dd->queue = blk_alloc_queue(GFP_KERNEL);
3114         if (dd->queue == NULL) {
3115                 dev_err(&dd->pdev->dev,
3116                         "Unable to allocate request queue\n");
3117                 rv = -ENOMEM;
3118                 goto block_queue_alloc_init_error;
3119         }
3120
3121         /* Attach our request function to the request queue. */
3122         blk_queue_make_request(dd->queue, mtip_make_request);
3123
3124         /* Set device limits. */
3125         set_bit(QUEUE_FLAG_NONROT, &dd->queue->queue_flags);
3126         blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
3127         blk_queue_physical_block_size(dd->queue, 4096);
3128         blk_queue_io_min(dd->queue, 4096);
3129         blk_queue_flush(dd->queue, 0);
3130
3131         dd->disk = alloc_disk(MTIP_MAX_MINORS);
3132         if (dd->disk  == NULL) {
3133                 dev_err(&dd->pdev->dev,
3134                         "Unable to allocate gendisk structure\n");
3135                 rv = -EINVAL;
3136                 goto alloc_disk_error;
3137         }
3138
3139         /* Generate the disk name, implemented same as in sd.c */
3140         do {
3141                 if (!ida_pre_get(&rssd_index_ida, GFP_KERNEL))
3142                         goto ida_get_error;
3143
3144                 spin_lock(&rssd_index_lock);
3145                 rv = ida_get_new(&rssd_index_ida, &index);
3146                 spin_unlock(&rssd_index_lock);
3147         } while (rv == -EAGAIN);
3148
3149         if (rv)
3150                 goto ida_get_error;
3151
3152         rv = rssd_disk_name_format("rssd",
3153                                 index,
3154                                 dd->disk->disk_name,
3155                                 DISK_NAME_LEN);
3156         if (rv)
3157                 goto disk_index_error;
3158
3159         dd->disk->driverfs_dev  = &dd->pdev->dev;
3160         dd->disk->major         = dd->major;
3161         dd->disk->first_minor   = dd->instance * MTIP_MAX_MINORS;
3162         dd->disk->fops          = &mtip_block_ops;
3163         dd->disk->queue         = dd->queue;
3164         dd->disk->private_data  = dd;
3165         dd->queue->queuedata    = dd;
3166         dd->index               = index;
3167
3168         /* Set the capacity of the device in 512 byte sectors. */
3169         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3170                 dev_warn(&dd->pdev->dev,
3171                         "Could not read drive capacity\n");
3172                 rv = -EIO;
3173                 goto read_capacity_error;
3174         }
3175         set_capacity(dd->disk, capacity);
3176
3177         /* Enable the block device and add it to /dev */
3178         add_disk(dd->disk);
3179
3180         /*
3181          * Now that the disk is active, initialize any sysfs attributes
3182          * managed by the protocol layer.
3183          */
3184         kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
3185         if (kobj) {
3186                 mtip_hw_sysfs_init(dd, kobj);
3187                 kobject_put(kobj);
3188         }
3189
3190         sprintf(thd_name, "mtip_svc_thd_%02d", index);
3191
3192         dd->mtip_svc_handler = kthread_run(mtip_service_thread,
3193                                                 dd, thd_name);
3194
3195         if (IS_ERR(dd->mtip_svc_handler)) {
3196                 printk(KERN_ERR "mtip32xx: service thread failed to start\n");
3197                 dd->mtip_svc_handler = NULL;
3198                 rv = -EFAULT;
3199                 goto read_capacity_error;
3200         }
3201
3202         return rv;
3203
3204 read_capacity_error:
3205         /*
3206          * Delete our gendisk structure. This also removes the device
3207          * from /dev
3208          */