Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma
[~shefty/rdma-dev.git] / drivers / tty / serial / pch_uart.c
1 /*
2  *Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
3  *
4  *This program is free software; you can redistribute it and/or modify
5  *it under the terms of the GNU General Public License as published by
6  *the Free Software Foundation; version 2 of the License.
7  *
8  *This program is distributed in the hope that it will be useful,
9  *but WITHOUT ANY WARRANTY; without even the implied warranty of
10  *MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  *GNU General Public License for more details.
12  *
13  *You should have received a copy of the GNU General Public License
14  *along with this program; if not, write to the Free Software
15  *Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
16  */
17 #include <linux/kernel.h>
18 #include <linux/serial_reg.h>
19 #include <linux/slab.h>
20 #include <linux/module.h>
21 #include <linux/pci.h>
22 #include <linux/serial_core.h>
23 #include <linux/tty.h>
24 #include <linux/tty_flip.h>
25 #include <linux/interrupt.h>
26 #include <linux/io.h>
27 #include <linux/dmi.h>
28 #include <linux/console.h>
29 #include <linux/nmi.h>
30 #include <linux/delay.h>
31
32 #include <linux/dmaengine.h>
33 #include <linux/pch_dma.h>
34
35 enum {
36         PCH_UART_HANDLED_RX_INT_SHIFT,
37         PCH_UART_HANDLED_TX_INT_SHIFT,
38         PCH_UART_HANDLED_RX_ERR_INT_SHIFT,
39         PCH_UART_HANDLED_RX_TRG_INT_SHIFT,
40         PCH_UART_HANDLED_MS_INT_SHIFT,
41 };
42
43 enum {
44         PCH_UART_8LINE,
45         PCH_UART_2LINE,
46 };
47
48 #define PCH_UART_DRIVER_DEVICE "ttyPCH"
49
50 /* Set the max number of UART port
51  * Intel EG20T PCH: 4 port
52  * LAPIS Semiconductor ML7213 IOH: 3 port
53  * LAPIS Semiconductor ML7223 IOH: 2 port
54 */
55 #define PCH_UART_NR     4
56
57 #define PCH_UART_HANDLED_RX_INT (1<<((PCH_UART_HANDLED_RX_INT_SHIFT)<<1))
58 #define PCH_UART_HANDLED_TX_INT (1<<((PCH_UART_HANDLED_TX_INT_SHIFT)<<1))
59 #define PCH_UART_HANDLED_RX_ERR_INT     (1<<((\
60                                         PCH_UART_HANDLED_RX_ERR_INT_SHIFT)<<1))
61 #define PCH_UART_HANDLED_RX_TRG_INT     (1<<((\
62                                         PCH_UART_HANDLED_RX_TRG_INT_SHIFT)<<1))
63 #define PCH_UART_HANDLED_MS_INT (1<<((PCH_UART_HANDLED_MS_INT_SHIFT)<<1))
64
65 #define PCH_UART_RBR            0x00
66 #define PCH_UART_THR            0x00
67
68 #define PCH_UART_IER_MASK       (PCH_UART_IER_ERBFI|PCH_UART_IER_ETBEI|\
69                                 PCH_UART_IER_ELSI|PCH_UART_IER_EDSSI)
70 #define PCH_UART_IER_ERBFI      0x00000001
71 #define PCH_UART_IER_ETBEI      0x00000002
72 #define PCH_UART_IER_ELSI       0x00000004
73 #define PCH_UART_IER_EDSSI      0x00000008
74
75 #define PCH_UART_IIR_IP                 0x00000001
76 #define PCH_UART_IIR_IID                0x00000006
77 #define PCH_UART_IIR_MSI                0x00000000
78 #define PCH_UART_IIR_TRI                0x00000002
79 #define PCH_UART_IIR_RRI                0x00000004
80 #define PCH_UART_IIR_REI                0x00000006
81 #define PCH_UART_IIR_TOI                0x00000008
82 #define PCH_UART_IIR_FIFO256            0x00000020
83 #define PCH_UART_IIR_FIFO64             PCH_UART_IIR_FIFO256
84 #define PCH_UART_IIR_FE                 0x000000C0
85
86 #define PCH_UART_FCR_FIFOE              0x00000001
87 #define PCH_UART_FCR_RFR                0x00000002
88 #define PCH_UART_FCR_TFR                0x00000004
89 #define PCH_UART_FCR_DMS                0x00000008
90 #define PCH_UART_FCR_FIFO256            0x00000020
91 #define PCH_UART_FCR_RFTL               0x000000C0
92
93 #define PCH_UART_FCR_RFTL1              0x00000000
94 #define PCH_UART_FCR_RFTL64             0x00000040
95 #define PCH_UART_FCR_RFTL128            0x00000080
96 #define PCH_UART_FCR_RFTL224            0x000000C0
97 #define PCH_UART_FCR_RFTL16             PCH_UART_FCR_RFTL64
98 #define PCH_UART_FCR_RFTL32             PCH_UART_FCR_RFTL128
99 #define PCH_UART_FCR_RFTL56             PCH_UART_FCR_RFTL224
100 #define PCH_UART_FCR_RFTL4              PCH_UART_FCR_RFTL64
101 #define PCH_UART_FCR_RFTL8              PCH_UART_FCR_RFTL128
102 #define PCH_UART_FCR_RFTL14             PCH_UART_FCR_RFTL224
103 #define PCH_UART_FCR_RFTL_SHIFT         6
104
105 #define PCH_UART_LCR_WLS        0x00000003
106 #define PCH_UART_LCR_STB        0x00000004
107 #define PCH_UART_LCR_PEN        0x00000008
108 #define PCH_UART_LCR_EPS        0x00000010
109 #define PCH_UART_LCR_SP         0x00000020
110 #define PCH_UART_LCR_SB         0x00000040
111 #define PCH_UART_LCR_DLAB       0x00000080
112 #define PCH_UART_LCR_NP         0x00000000
113 #define PCH_UART_LCR_OP         PCH_UART_LCR_PEN
114 #define PCH_UART_LCR_EP         (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS)
115 #define PCH_UART_LCR_1P         (PCH_UART_LCR_PEN | PCH_UART_LCR_SP)
116 #define PCH_UART_LCR_0P         (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS |\
117                                 PCH_UART_LCR_SP)
118
119 #define PCH_UART_LCR_5BIT       0x00000000
120 #define PCH_UART_LCR_6BIT       0x00000001
121 #define PCH_UART_LCR_7BIT       0x00000002
122 #define PCH_UART_LCR_8BIT       0x00000003
123
124 #define PCH_UART_MCR_DTR        0x00000001
125 #define PCH_UART_MCR_RTS        0x00000002
126 #define PCH_UART_MCR_OUT        0x0000000C
127 #define PCH_UART_MCR_LOOP       0x00000010
128 #define PCH_UART_MCR_AFE        0x00000020
129
130 #define PCH_UART_LSR_DR         0x00000001
131 #define PCH_UART_LSR_ERR        (1<<7)
132
133 #define PCH_UART_MSR_DCTS       0x00000001
134 #define PCH_UART_MSR_DDSR       0x00000002
135 #define PCH_UART_MSR_TERI       0x00000004
136 #define PCH_UART_MSR_DDCD       0x00000008
137 #define PCH_UART_MSR_CTS        0x00000010
138 #define PCH_UART_MSR_DSR        0x00000020
139 #define PCH_UART_MSR_RI         0x00000040
140 #define PCH_UART_MSR_DCD        0x00000080
141 #define PCH_UART_MSR_DELTA      (PCH_UART_MSR_DCTS | PCH_UART_MSR_DDSR |\
142                                 PCH_UART_MSR_TERI | PCH_UART_MSR_DDCD)
143
144 #define PCH_UART_DLL            0x00
145 #define PCH_UART_DLM            0x01
146
147 #define PCH_UART_IID_RLS        (PCH_UART_IIR_REI)
148 #define PCH_UART_IID_RDR        (PCH_UART_IIR_RRI)
149 #define PCH_UART_IID_RDR_TO     (PCH_UART_IIR_RRI | PCH_UART_IIR_TOI)
150 #define PCH_UART_IID_THRE       (PCH_UART_IIR_TRI)
151 #define PCH_UART_IID_MS         (PCH_UART_IIR_MSI)
152
153 #define PCH_UART_HAL_PARITY_NONE        (PCH_UART_LCR_NP)
154 #define PCH_UART_HAL_PARITY_ODD         (PCH_UART_LCR_OP)
155 #define PCH_UART_HAL_PARITY_EVEN        (PCH_UART_LCR_EP)
156 #define PCH_UART_HAL_PARITY_FIX1        (PCH_UART_LCR_1P)
157 #define PCH_UART_HAL_PARITY_FIX0        (PCH_UART_LCR_0P)
158 #define PCH_UART_HAL_5BIT               (PCH_UART_LCR_5BIT)
159 #define PCH_UART_HAL_6BIT               (PCH_UART_LCR_6BIT)
160 #define PCH_UART_HAL_7BIT               (PCH_UART_LCR_7BIT)
161 #define PCH_UART_HAL_8BIT               (PCH_UART_LCR_8BIT)
162 #define PCH_UART_HAL_STB1               0
163 #define PCH_UART_HAL_STB2               (PCH_UART_LCR_STB)
164
165 #define PCH_UART_HAL_CLR_TX_FIFO        (PCH_UART_FCR_TFR)
166 #define PCH_UART_HAL_CLR_RX_FIFO        (PCH_UART_FCR_RFR)
167 #define PCH_UART_HAL_CLR_ALL_FIFO       (PCH_UART_HAL_CLR_TX_FIFO | \
168                                         PCH_UART_HAL_CLR_RX_FIFO)
169
170 #define PCH_UART_HAL_DMA_MODE0          0
171 #define PCH_UART_HAL_FIFO_DIS           0
172 #define PCH_UART_HAL_FIFO16             (PCH_UART_FCR_FIFOE)
173 #define PCH_UART_HAL_FIFO256            (PCH_UART_FCR_FIFOE | \
174                                         PCH_UART_FCR_FIFO256)
175 #define PCH_UART_HAL_FIFO64             (PCH_UART_HAL_FIFO256)
176 #define PCH_UART_HAL_TRIGGER1           (PCH_UART_FCR_RFTL1)
177 #define PCH_UART_HAL_TRIGGER64          (PCH_UART_FCR_RFTL64)
178 #define PCH_UART_HAL_TRIGGER128         (PCH_UART_FCR_RFTL128)
179 #define PCH_UART_HAL_TRIGGER224         (PCH_UART_FCR_RFTL224)
180 #define PCH_UART_HAL_TRIGGER16          (PCH_UART_FCR_RFTL16)
181 #define PCH_UART_HAL_TRIGGER32          (PCH_UART_FCR_RFTL32)
182 #define PCH_UART_HAL_TRIGGER56          (PCH_UART_FCR_RFTL56)
183 #define PCH_UART_HAL_TRIGGER4           (PCH_UART_FCR_RFTL4)
184 #define PCH_UART_HAL_TRIGGER8           (PCH_UART_FCR_RFTL8)
185 #define PCH_UART_HAL_TRIGGER14          (PCH_UART_FCR_RFTL14)
186 #define PCH_UART_HAL_TRIGGER_L          (PCH_UART_FCR_RFTL64)
187 #define PCH_UART_HAL_TRIGGER_M          (PCH_UART_FCR_RFTL128)
188 #define PCH_UART_HAL_TRIGGER_H          (PCH_UART_FCR_RFTL224)
189
190 #define PCH_UART_HAL_RX_INT             (PCH_UART_IER_ERBFI)
191 #define PCH_UART_HAL_TX_INT             (PCH_UART_IER_ETBEI)
192 #define PCH_UART_HAL_RX_ERR_INT         (PCH_UART_IER_ELSI)
193 #define PCH_UART_HAL_MS_INT             (PCH_UART_IER_EDSSI)
194 #define PCH_UART_HAL_ALL_INT            (PCH_UART_IER_MASK)
195
196 #define PCH_UART_HAL_DTR                (PCH_UART_MCR_DTR)
197 #define PCH_UART_HAL_RTS                (PCH_UART_MCR_RTS)
198 #define PCH_UART_HAL_OUT                (PCH_UART_MCR_OUT)
199 #define PCH_UART_HAL_LOOP               (PCH_UART_MCR_LOOP)
200 #define PCH_UART_HAL_AFE                (PCH_UART_MCR_AFE)
201
202 #define PCI_VENDOR_ID_ROHM              0x10DB
203
204 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
205
206 #define DEFAULT_BAUD_RATE 1843200 /* 1.8432MHz */
207
208 struct pch_uart_buffer {
209         unsigned char *buf;
210         int size;
211 };
212
213 struct eg20t_port {
214         struct uart_port port;
215         int port_type;
216         void __iomem *membase;
217         resource_size_t mapbase;
218         unsigned int iobase;
219         struct pci_dev *pdev;
220         int fifo_size;
221         int base_baud;
222         int start_tx;
223         int start_rx;
224         int tx_empty;
225         int int_dis_flag;
226         int trigger;
227         int trigger_level;
228         struct pch_uart_buffer rxbuf;
229         unsigned int dmsr;
230         unsigned int fcr;
231         unsigned int mcr;
232         unsigned int use_dma;
233         unsigned int use_dma_flag;
234         struct dma_async_tx_descriptor  *desc_tx;
235         struct dma_async_tx_descriptor  *desc_rx;
236         struct pch_dma_slave            param_tx;
237         struct pch_dma_slave            param_rx;
238         struct dma_chan                 *chan_tx;
239         struct dma_chan                 *chan_rx;
240         struct scatterlist              *sg_tx_p;
241         int                             nent;
242         struct scatterlist              sg_rx;
243         int                             tx_dma_use;
244         void                            *rx_buf_virt;
245         dma_addr_t                      rx_buf_dma;
246 };
247
248 /**
249  * struct pch_uart_driver_data - private data structure for UART-DMA
250  * @port_type:                  The number of DMA channel
251  * @line_no:                    UART port line number (0, 1, 2...)
252  */
253 struct pch_uart_driver_data {
254         int port_type;
255         int line_no;
256 };
257
258 enum pch_uart_num_t {
259         pch_et20t_uart0 = 0,
260         pch_et20t_uart1,
261         pch_et20t_uart2,
262         pch_et20t_uart3,
263         pch_ml7213_uart0,
264         pch_ml7213_uart1,
265         pch_ml7213_uart2,
266         pch_ml7223_uart0,
267         pch_ml7223_uart1,
268         pch_ml7831_uart0,
269         pch_ml7831_uart1,
270 };
271
272 static struct pch_uart_driver_data drv_dat[] = {
273         [pch_et20t_uart0] = {PCH_UART_8LINE, 0},
274         [pch_et20t_uart1] = {PCH_UART_2LINE, 1},
275         [pch_et20t_uart2] = {PCH_UART_2LINE, 2},
276         [pch_et20t_uart3] = {PCH_UART_2LINE, 3},
277         [pch_ml7213_uart0] = {PCH_UART_8LINE, 0},
278         [pch_ml7213_uart1] = {PCH_UART_2LINE, 1},
279         [pch_ml7213_uart2] = {PCH_UART_2LINE, 2},
280         [pch_ml7223_uart0] = {PCH_UART_8LINE, 0},
281         [pch_ml7223_uart1] = {PCH_UART_2LINE, 1},
282         [pch_ml7831_uart0] = {PCH_UART_8LINE, 0},
283         [pch_ml7831_uart1] = {PCH_UART_2LINE, 1},
284 };
285
286 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
287 static struct eg20t_port *pch_uart_ports[PCH_UART_NR];
288 #endif
289 static unsigned int default_baud = 9600;
290 static const int trigger_level_256[4] = { 1, 64, 128, 224 };
291 static const int trigger_level_64[4] = { 1, 16, 32, 56 };
292 static const int trigger_level_16[4] = { 1, 4, 8, 14 };
293 static const int trigger_level_1[4] = { 1, 1, 1, 1 };
294
295 static void pch_uart_hal_request(struct pci_dev *pdev, int fifosize,
296                                  int base_baud)
297 {
298         struct eg20t_port *priv = pci_get_drvdata(pdev);
299
300         priv->trigger_level = 1;
301         priv->fcr = 0;
302 }
303
304 static unsigned int get_msr(struct eg20t_port *priv, void __iomem *base)
305 {
306         unsigned int msr = ioread8(base + UART_MSR);
307         priv->dmsr |= msr & PCH_UART_MSR_DELTA;
308
309         return msr;
310 }
311
312 static void pch_uart_hal_enable_interrupt(struct eg20t_port *priv,
313                                           unsigned int flag)
314 {
315         u8 ier = ioread8(priv->membase + UART_IER);
316         ier |= flag & PCH_UART_IER_MASK;
317         iowrite8(ier, priv->membase + UART_IER);
318 }
319
320 static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
321                                            unsigned int flag)
322 {
323         u8 ier = ioread8(priv->membase + UART_IER);
324         ier &= ~(flag & PCH_UART_IER_MASK);
325         iowrite8(ier, priv->membase + UART_IER);
326 }
327
328 static int pch_uart_hal_set_line(struct eg20t_port *priv, int baud,
329                                  unsigned int parity, unsigned int bits,
330                                  unsigned int stb)
331 {
332         unsigned int dll, dlm, lcr;
333         int div;
334
335         div = DIV_ROUND_CLOSEST(priv->base_baud / 16, baud);
336         if (div < 0 || USHRT_MAX <= div) {
337                 dev_err(priv->port.dev, "Invalid Baud(div=0x%x)\n", div);
338                 return -EINVAL;
339         }
340
341         dll = (unsigned int)div & 0x00FFU;
342         dlm = ((unsigned int)div >> 8) & 0x00FFU;
343
344         if (parity & ~(PCH_UART_LCR_PEN | PCH_UART_LCR_EPS | PCH_UART_LCR_SP)) {
345                 dev_err(priv->port.dev, "Invalid parity(0x%x)\n", parity);
346                 return -EINVAL;
347         }
348
349         if (bits & ~PCH_UART_LCR_WLS) {
350                 dev_err(priv->port.dev, "Invalid bits(0x%x)\n", bits);
351                 return -EINVAL;
352         }
353
354         if (stb & ~PCH_UART_LCR_STB) {
355                 dev_err(priv->port.dev, "Invalid STB(0x%x)\n", stb);
356                 return -EINVAL;
357         }
358
359         lcr = parity;
360         lcr |= bits;
361         lcr |= stb;
362
363         dev_dbg(priv->port.dev, "%s:baud = %d, div = %04x, lcr = %02x (%lu)\n",
364                  __func__, baud, div, lcr, jiffies);
365         iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
366         iowrite8(dll, priv->membase + PCH_UART_DLL);
367         iowrite8(dlm, priv->membase + PCH_UART_DLM);
368         iowrite8(lcr, priv->membase + UART_LCR);
369
370         return 0;
371 }
372
373 static int pch_uart_hal_fifo_reset(struct eg20t_port *priv,
374                                     unsigned int flag)
375 {
376         if (flag & ~(PCH_UART_FCR_TFR | PCH_UART_FCR_RFR)) {
377                 dev_err(priv->port.dev, "%s:Invalid flag(0x%x)\n",
378                         __func__, flag);
379                 return -EINVAL;
380         }
381
382         iowrite8(PCH_UART_FCR_FIFOE | priv->fcr, priv->membase + UART_FCR);
383         iowrite8(PCH_UART_FCR_FIFOE | priv->fcr | flag,
384                  priv->membase + UART_FCR);
385         iowrite8(priv->fcr, priv->membase + UART_FCR);
386
387         return 0;
388 }
389
390 static int pch_uart_hal_set_fifo(struct eg20t_port *priv,
391                                  unsigned int dmamode,
392                                  unsigned int fifo_size, unsigned int trigger)
393 {
394         u8 fcr;
395
396         if (dmamode & ~PCH_UART_FCR_DMS) {
397                 dev_err(priv->port.dev, "%s:Invalid DMA Mode(0x%x)\n",
398                         __func__, dmamode);
399                 return -EINVAL;
400         }
401
402         if (fifo_size & ~(PCH_UART_FCR_FIFOE | PCH_UART_FCR_FIFO256)) {
403                 dev_err(priv->port.dev, "%s:Invalid FIFO SIZE(0x%x)\n",
404                         __func__, fifo_size);
405                 return -EINVAL;
406         }
407
408         if (trigger & ~PCH_UART_FCR_RFTL) {
409                 dev_err(priv->port.dev, "%s:Invalid TRIGGER(0x%x)\n",
410                         __func__, trigger);
411                 return -EINVAL;
412         }
413
414         switch (priv->fifo_size) {
415         case 256:
416                 priv->trigger_level =
417                     trigger_level_256[trigger >> PCH_UART_FCR_RFTL_SHIFT];
418                 break;
419         case 64:
420                 priv->trigger_level =
421                     trigger_level_64[trigger >> PCH_UART_FCR_RFTL_SHIFT];
422                 break;
423         case 16:
424                 priv->trigger_level =
425                     trigger_level_16[trigger >> PCH_UART_FCR_RFTL_SHIFT];
426                 break;
427         default:
428                 priv->trigger_level =
429                     trigger_level_1[trigger >> PCH_UART_FCR_RFTL_SHIFT];
430                 break;
431         }
432         fcr =
433             dmamode | fifo_size | trigger | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR;
434         iowrite8(PCH_UART_FCR_FIFOE, priv->membase + UART_FCR);
435         iowrite8(PCH_UART_FCR_FIFOE | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR,
436                  priv->membase + UART_FCR);
437         iowrite8(fcr, priv->membase + UART_FCR);
438         priv->fcr = fcr;
439
440         return 0;
441 }
442
443 static u8 pch_uart_hal_get_modem(struct eg20t_port *priv)
444 {
445         priv->dmsr = 0;
446         return get_msr(priv, priv->membase);
447 }
448
449 static void pch_uart_hal_write(struct eg20t_port *priv,
450                               const unsigned char *buf, int tx_size)
451 {
452         int i;
453         unsigned int thr;
454
455         for (i = 0; i < tx_size;) {
456                 thr = buf[i++];
457                 iowrite8(thr, priv->membase + PCH_UART_THR);
458         }
459 }
460
461 static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
462                              int rx_size)
463 {
464         int i;
465         u8 rbr, lsr;
466
467         lsr = ioread8(priv->membase + UART_LSR);
468         for (i = 0, lsr = ioread8(priv->membase + UART_LSR);
469              i < rx_size && lsr & UART_LSR_DR;
470              lsr = ioread8(priv->membase + UART_LSR)) {
471                 rbr = ioread8(priv->membase + PCH_UART_RBR);
472                 buf[i++] = rbr;
473         }
474         return i;
475 }
476
477 static unsigned int pch_uart_hal_get_iid(struct eg20t_port *priv)
478 {
479         unsigned int iir;
480         int ret;
481
482         iir = ioread8(priv->membase + UART_IIR);
483         ret = (iir & (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP));
484         return ret;
485 }
486
487 static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
488 {
489         return ioread8(priv->membase + UART_LSR);
490 }
491
492 static void pch_uart_hal_set_break(struct eg20t_port *priv, int on)
493 {
494         unsigned int lcr;
495
496         lcr = ioread8(priv->membase + UART_LCR);
497         if (on)
498                 lcr |= PCH_UART_LCR_SB;
499         else
500                 lcr &= ~PCH_UART_LCR_SB;
501
502         iowrite8(lcr, priv->membase + UART_LCR);
503 }
504
505 static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
506                    int size)
507 {
508         struct uart_port *port;
509         struct tty_struct *tty;
510
511         port = &priv->port;
512         tty = tty_port_tty_get(&port->state->port);
513         if (!tty) {
514                 dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
515                 return -EBUSY;
516         }
517
518         tty_insert_flip_string(tty, buf, size);
519         tty_flip_buffer_push(tty);
520         tty_kref_put(tty);
521
522         return 0;
523 }
524
525 static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf)
526 {
527         int ret;
528         struct uart_port *port = &priv->port;
529
530         if (port->x_char) {
531                 dev_dbg(priv->port.dev, "%s:X character send %02x (%lu)\n",
532                         __func__, port->x_char, jiffies);
533                 buf[0] = port->x_char;
534                 port->x_char = 0;
535                 ret = 1;
536         } else {
537                 ret = 0;
538         }
539
540         return ret;
541 }
542
543 static int dma_push_rx(struct eg20t_port *priv, int size)
544 {
545         struct tty_struct *tty;
546         int room;
547         struct uart_port *port = &priv->port;
548
549         port = &priv->port;
550         tty = tty_port_tty_get(&port->state->port);
551         if (!tty) {
552                 dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
553                 return 0;
554         }
555
556         room = tty_buffer_request_room(tty, size);
557
558         if (room < size)
559                 dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
560                          size - room);
561         if (!room)
562                 return room;
563
564         tty_insert_flip_string(tty, sg_virt(&priv->sg_rx), size);
565
566         port->icount.rx += room;
567         tty_kref_put(tty);
568
569         return room;
570 }
571
572 static void pch_free_dma(struct uart_port *port)
573 {
574         struct eg20t_port *priv;
575         priv = container_of(port, struct eg20t_port, port);
576
577         if (priv->chan_tx) {
578                 dma_release_channel(priv->chan_tx);
579                 priv->chan_tx = NULL;
580         }
581         if (priv->chan_rx) {
582                 dma_release_channel(priv->chan_rx);
583                 priv->chan_rx = NULL;
584         }
585         if (sg_dma_address(&priv->sg_rx))
586                 dma_free_coherent(port->dev, port->fifosize,
587                                   sg_virt(&priv->sg_rx),
588                                   sg_dma_address(&priv->sg_rx));
589
590         return;
591 }
592
593 static bool filter(struct dma_chan *chan, void *slave)
594 {
595         struct pch_dma_slave *param = slave;
596
597         if ((chan->chan_id == param->chan_id) && (param->dma_dev ==
598                                                   chan->device->dev)) {
599                 chan->private = param;
600                 return true;
601         } else {
602                 return false;
603         }
604 }
605
606 static void pch_request_dma(struct uart_port *port)
607 {
608         dma_cap_mask_t mask;
609         struct dma_chan *chan;
610         struct pci_dev *dma_dev;
611         struct pch_dma_slave *param;
612         struct eg20t_port *priv =
613                                 container_of(port, struct eg20t_port, port);
614         dma_cap_zero(mask);
615         dma_cap_set(DMA_SLAVE, mask);
616
617         dma_dev = pci_get_bus_and_slot(priv->pdev->bus->number,
618                                        PCI_DEVFN(0xa, 0)); /* Get DMA's dev
619                                                                 information */
620         /* Set Tx DMA */
621         param = &priv->param_tx;
622         param->dma_dev = &dma_dev->dev;
623         param->chan_id = priv->port.line * 2; /* Tx = 0, 2, 4, ... */
624
625         param->tx_reg = port->mapbase + UART_TX;
626         chan = dma_request_channel(mask, filter, param);
627         if (!chan) {
628                 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n",
629                         __func__);
630                 return;
631         }
632         priv->chan_tx = chan;
633
634         /* Set Rx DMA */
635         param = &priv->param_rx;
636         param->dma_dev = &dma_dev->dev;
637         param->chan_id = priv->port.line * 2 + 1; /* Rx = Tx + 1 */
638
639         param->rx_reg = port->mapbase + UART_RX;
640         chan = dma_request_channel(mask, filter, param);
641         if (!chan) {
642                 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Rx)\n",
643                         __func__);
644                 dma_release_channel(priv->chan_tx);
645                 priv->chan_tx = NULL;
646                 return;
647         }
648
649         /* Get Consistent memory for DMA */
650         priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize,
651                                     &priv->rx_buf_dma, GFP_KERNEL);
652         priv->chan_rx = chan;
653 }
654
655 static void pch_dma_rx_complete(void *arg)
656 {
657         struct eg20t_port *priv = arg;
658         struct uart_port *port = &priv->port;
659         struct tty_struct *tty = tty_port_tty_get(&port->state->port);
660         int count;
661
662         if (!tty) {
663                 dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
664                 return;
665         }
666
667         dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE);
668         count = dma_push_rx(priv, priv->trigger_level);
669         if (count)
670                 tty_flip_buffer_push(tty);
671         tty_kref_put(tty);
672         async_tx_ack(priv->desc_rx);
673         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT);
674 }
675
676 static void pch_dma_tx_complete(void *arg)
677 {
678         struct eg20t_port *priv = arg;
679         struct uart_port *port = &priv->port;
680         struct circ_buf *xmit = &port->state->xmit;
681         struct scatterlist *sg = priv->sg_tx_p;
682         int i;
683
684         for (i = 0; i < priv->nent; i++, sg++) {
685                 xmit->tail += sg_dma_len(sg);
686                 port->icount.tx += sg_dma_len(sg);
687         }
688         xmit->tail &= UART_XMIT_SIZE - 1;
689         async_tx_ack(priv->desc_tx);
690         dma_unmap_sg(port->dev, sg, priv->nent, DMA_TO_DEVICE);
691         priv->tx_dma_use = 0;
692         priv->nent = 0;
693         kfree(priv->sg_tx_p);
694         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
695 }
696
697 static int pop_tx(struct eg20t_port *priv, int size)
698 {
699         int count = 0;
700         struct uart_port *port = &priv->port;
701         struct circ_buf *xmit = &port->state->xmit;
702
703         if (uart_tx_stopped(port) || uart_circ_empty(xmit) || count >= size)
704                 goto pop_tx_end;
705
706         do {
707                 int cnt_to_end =
708                     CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
709                 int sz = min(size - count, cnt_to_end);
710                 pch_uart_hal_write(priv, &xmit->buf[xmit->tail], sz);
711                 xmit->tail = (xmit->tail + sz) & (UART_XMIT_SIZE - 1);
712                 count += sz;
713         } while (!uart_circ_empty(xmit) && count < size);
714
715 pop_tx_end:
716         dev_dbg(priv->port.dev, "%d characters. Remained %d characters.(%lu)\n",
717                  count, size - count, jiffies);
718
719         return count;
720 }
721
722 static int handle_rx_to(struct eg20t_port *priv)
723 {
724         struct pch_uart_buffer *buf;
725         int rx_size;
726         int ret;
727         if (!priv->start_rx) {
728                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT);
729                 return 0;
730         }
731         buf = &priv->rxbuf;
732         do {
733                 rx_size = pch_uart_hal_read(priv, buf->buf, buf->size);
734                 ret = push_rx(priv, buf->buf, rx_size);
735                 if (ret)
736                         return 0;
737         } while (rx_size == buf->size);
738
739         return PCH_UART_HANDLED_RX_INT;
740 }
741
742 static int handle_rx(struct eg20t_port *priv)
743 {
744         return handle_rx_to(priv);
745 }
746
747 static int dma_handle_rx(struct eg20t_port *priv)
748 {
749         struct uart_port *port = &priv->port;
750         struct dma_async_tx_descriptor *desc;
751         struct scatterlist *sg;
752
753         priv = container_of(port, struct eg20t_port, port);
754         sg = &priv->sg_rx;
755
756         sg_init_table(&priv->sg_rx, 1); /* Initialize SG table */
757
758         sg_dma_len(sg) = priv->trigger_level;
759
760         sg_set_page(&priv->sg_rx, virt_to_page(priv->rx_buf_virt),
761                      sg_dma_len(sg), (unsigned long)priv->rx_buf_virt &
762                      ~PAGE_MASK);
763
764         sg_dma_address(sg) = priv->rx_buf_dma;
765
766         desc = priv->chan_rx->device->device_prep_slave_sg(priv->chan_rx,
767                         sg, 1, DMA_DEV_TO_MEM,
768                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
769
770         if (!desc)
771                 return 0;
772
773         priv->desc_rx = desc;
774         desc->callback = pch_dma_rx_complete;
775         desc->callback_param = priv;
776         desc->tx_submit(desc);
777         dma_async_issue_pending(priv->chan_rx);
778
779         return PCH_UART_HANDLED_RX_INT;
780 }
781
782 static unsigned int handle_tx(struct eg20t_port *priv)
783 {
784         struct uart_port *port = &priv->port;
785         struct circ_buf *xmit = &port->state->xmit;
786         int fifo_size;
787         int tx_size;
788         int size;
789         int tx_empty;
790
791         if (!priv->start_tx) {
792                 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
793                         __func__, jiffies);
794                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
795                 priv->tx_empty = 1;
796                 return 0;
797         }
798
799         fifo_size = max(priv->fifo_size, 1);
800         tx_empty = 1;
801         if (pop_tx_x(priv, xmit->buf)) {
802                 pch_uart_hal_write(priv, xmit->buf, 1);
803                 port->icount.tx++;
804                 tx_empty = 0;
805                 fifo_size--;
806         }
807         size = min(xmit->head - xmit->tail, fifo_size);
808         if (size < 0)
809                 size = fifo_size;
810
811         tx_size = pop_tx(priv, size);
812         if (tx_size > 0) {
813                 port->icount.tx += tx_size;
814                 tx_empty = 0;
815         }
816
817         priv->tx_empty = tx_empty;
818
819         if (tx_empty) {
820                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
821                 uart_write_wakeup(port);
822         }
823
824         return PCH_UART_HANDLED_TX_INT;
825 }
826
827 static unsigned int dma_handle_tx(struct eg20t_port *priv)
828 {
829         struct uart_port *port = &priv->port;
830         struct circ_buf *xmit = &port->state->xmit;
831         struct scatterlist *sg;
832         int nent;
833         int fifo_size;
834         int tx_empty;
835         struct dma_async_tx_descriptor *desc;
836         int num;
837         int i;
838         int bytes;
839         int size;
840         int rem;
841
842         if (!priv->start_tx) {
843                 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
844                         __func__, jiffies);
845                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
846                 priv->tx_empty = 1;
847                 return 0;
848         }
849
850         if (priv->tx_dma_use) {
851                 dev_dbg(priv->port.dev, "%s:Tx is not completed. (%lu)\n",
852                         __func__, jiffies);
853                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
854                 priv->tx_empty = 1;
855                 return 0;
856         }
857
858         fifo_size = max(priv->fifo_size, 1);
859         tx_empty = 1;
860         if (pop_tx_x(priv, xmit->buf)) {
861                 pch_uart_hal_write(priv, xmit->buf, 1);
862                 port->icount.tx++;
863                 tx_empty = 0;
864                 fifo_size--;
865         }
866
867         bytes = min((int)CIRC_CNT(xmit->head, xmit->tail,
868                              UART_XMIT_SIZE), CIRC_CNT_TO_END(xmit->head,
869                              xmit->tail, UART_XMIT_SIZE));
870         if (!bytes) {
871                 dev_dbg(priv->port.dev, "%s 0 bytes return\n", __func__);
872                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
873                 uart_write_wakeup(port);
874                 return 0;
875         }
876
877         if (bytes > fifo_size) {
878                 num = bytes / fifo_size + 1;
879                 size = fifo_size;
880                 rem = bytes % fifo_size;
881         } else {
882                 num = 1;
883                 size = bytes;
884                 rem = bytes;
885         }
886
887         dev_dbg(priv->port.dev, "%s num=%d size=%d rem=%d\n",
888                 __func__, num, size, rem);
889
890         priv->tx_dma_use = 1;
891
892         priv->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
893
894         sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
895         sg = priv->sg_tx_p;
896
897         for (i = 0; i < num; i++, sg++) {
898                 if (i == (num - 1))
899                         sg_set_page(sg, virt_to_page(xmit->buf),
900                                     rem, fifo_size * i);
901                 else
902                         sg_set_page(sg, virt_to_page(xmit->buf),
903                                     size, fifo_size * i);
904         }
905
906         sg = priv->sg_tx_p;
907         nent = dma_map_sg(port->dev, sg, num, DMA_TO_DEVICE);
908         if (!nent) {
909                 dev_err(priv->port.dev, "%s:dma_map_sg Failed\n", __func__);
910                 return 0;
911         }
912         priv->nent = nent;
913
914         for (i = 0; i < nent; i++, sg++) {
915                 sg->offset = (xmit->tail & (UART_XMIT_SIZE - 1)) +
916                               fifo_size * i;
917                 sg_dma_address(sg) = (sg_dma_address(sg) &
918                                     ~(UART_XMIT_SIZE - 1)) + sg->offset;
919                 if (i == (nent - 1))
920                         sg_dma_len(sg) = rem;
921                 else
922                         sg_dma_len(sg) = size;
923         }
924
925         desc = priv->chan_tx->device->device_prep_slave_sg(priv->chan_tx,
926                                         priv->sg_tx_p, nent, DMA_MEM_TO_DEV,
927                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
928         if (!desc) {
929                 dev_err(priv->port.dev, "%s:device_prep_slave_sg Failed\n",
930                         __func__);
931                 return 0;
932         }
933         dma_sync_sg_for_device(port->dev, priv->sg_tx_p, nent, DMA_TO_DEVICE);
934         priv->desc_tx = desc;
935         desc->callback = pch_dma_tx_complete;
936         desc->callback_param = priv;
937
938         desc->tx_submit(desc);
939
940         dma_async_issue_pending(priv->chan_tx);
941
942         return PCH_UART_HANDLED_TX_INT;
943 }
944
945 static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
946 {
947         u8 fcr = ioread8(priv->membase + UART_FCR);
948
949         /* Reset FIFO */
950         fcr |= UART_FCR_CLEAR_RCVR;
951         iowrite8(fcr, priv->membase + UART_FCR);
952
953         if (lsr & PCH_UART_LSR_ERR)
954                 dev_err(&priv->pdev->dev, "Error data in FIFO\n");
955
956         if (lsr & UART_LSR_FE)
957                 dev_err(&priv->pdev->dev, "Framing Error\n");
958
959         if (lsr & UART_LSR_PE)
960                 dev_err(&priv->pdev->dev, "Parity Error\n");
961
962         if (lsr & UART_LSR_OE)
963                 dev_err(&priv->pdev->dev, "Overrun Error\n");
964 }
965
966 static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
967 {
968         struct eg20t_port *priv = dev_id;
969         unsigned int handled;
970         u8 lsr;
971         int ret = 0;
972         unsigned int iid;
973         unsigned long flags;
974
975         spin_lock_irqsave(&priv->port.lock, flags);
976         handled = 0;
977         while ((iid = pch_uart_hal_get_iid(priv)) > 1) {
978                 switch (iid) {
979                 case PCH_UART_IID_RLS:  /* Receiver Line Status */
980                         lsr = pch_uart_hal_get_line_status(priv);
981                         if (lsr & (PCH_UART_LSR_ERR | UART_LSR_FE |
982                                                 UART_LSR_PE | UART_LSR_OE)) {
983                                 pch_uart_err_ir(priv, lsr);
984                                 ret = PCH_UART_HANDLED_RX_ERR_INT;
985                         }
986                         break;
987                 case PCH_UART_IID_RDR:  /* Received Data Ready */
988                         if (priv->use_dma) {
989                                 pch_uart_hal_disable_interrupt(priv,
990                                                         PCH_UART_HAL_RX_INT);
991                                 ret = dma_handle_rx(priv);
992                                 if (!ret)
993                                         pch_uart_hal_enable_interrupt(priv,
994                                                         PCH_UART_HAL_RX_INT);
995                         } else {
996                                 ret = handle_rx(priv);
997                         }
998                         break;
999                 case PCH_UART_IID_RDR_TO:       /* Received Data Ready
1000                                                    (FIFO Timeout) */
1001                         ret = handle_rx_to(priv);
1002                         break;
1003                 case PCH_UART_IID_THRE: /* Transmitter Holding Register
1004                                                    Empty */
1005                         if (priv->use_dma)
1006                                 ret = dma_handle_tx(priv);
1007                         else
1008                                 ret = handle_tx(priv);
1009                         break;
1010                 case PCH_UART_IID_MS:   /* Modem Status */
1011                         ret = PCH_UART_HANDLED_MS_INT;
1012                         break;
1013                 default:        /* Never junp to this label */
1014                         dev_err(priv->port.dev, "%s:iid=%d (%lu)\n", __func__,
1015                                 iid, jiffies);
1016                         ret = -1;
1017                         break;
1018                 }
1019                 handled |= (unsigned int)ret;
1020         }
1021         if (handled == 0 && iid <= 1) {
1022                 if (priv->int_dis_flag)
1023                         priv->int_dis_flag = 0;
1024         }
1025
1026         spin_unlock_irqrestore(&priv->port.lock, flags);
1027         return IRQ_RETVAL(handled);
1028 }
1029
1030 /* This function tests whether the transmitter fifo and shifter for the port
1031                                                 described by 'port' is empty. */
1032 static unsigned int pch_uart_tx_empty(struct uart_port *port)
1033 {
1034         struct eg20t_port *priv;
1035         int ret;
1036         priv = container_of(port, struct eg20t_port, port);
1037         if (priv->tx_empty)
1038                 ret = TIOCSER_TEMT;
1039         else
1040                 ret = 0;
1041
1042         return ret;
1043 }
1044
1045 /* Returns the current state of modem control inputs. */
1046 static unsigned int pch_uart_get_mctrl(struct uart_port *port)
1047 {
1048         struct eg20t_port *priv;
1049         u8 modem;
1050         unsigned int ret = 0;
1051
1052         priv = container_of(port, struct eg20t_port, port);
1053         modem = pch_uart_hal_get_modem(priv);
1054
1055         if (modem & UART_MSR_DCD)
1056                 ret |= TIOCM_CAR;
1057
1058         if (modem & UART_MSR_RI)
1059                 ret |= TIOCM_RNG;
1060
1061         if (modem & UART_MSR_DSR)
1062                 ret |= TIOCM_DSR;
1063
1064         if (modem & UART_MSR_CTS)
1065                 ret |= TIOCM_CTS;
1066
1067         return ret;
1068 }
1069
1070 static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
1071 {
1072         u32 mcr = 0;
1073         struct eg20t_port *priv = container_of(port, struct eg20t_port, port);
1074
1075         if (mctrl & TIOCM_DTR)
1076                 mcr |= UART_MCR_DTR;
1077         if (mctrl & TIOCM_RTS)
1078                 mcr |= UART_MCR_RTS;
1079         if (mctrl & TIOCM_LOOP)
1080                 mcr |= UART_MCR_LOOP;
1081
1082         if (priv->mcr & UART_MCR_AFE)
1083                 mcr |= UART_MCR_AFE;
1084
1085         if (mctrl)
1086                 iowrite8(mcr, priv->membase + UART_MCR);
1087 }
1088
1089 static void pch_uart_stop_tx(struct uart_port *port)
1090 {
1091         struct eg20t_port *priv;
1092         priv = container_of(port, struct eg20t_port, port);
1093         priv->start_tx = 0;
1094         priv->tx_dma_use = 0;
1095 }
1096
1097 static void pch_uart_start_tx(struct uart_port *port)
1098 {
1099         struct eg20t_port *priv;
1100
1101         priv = container_of(port, struct eg20t_port, port);
1102
1103         if (priv->use_dma) {
1104                 if (priv->tx_dma_use) {
1105                         dev_dbg(priv->port.dev, "%s : Tx DMA is NOT empty.\n",
1106                                 __func__);
1107                         return;
1108                 }
1109         }
1110
1111         priv->start_tx = 1;
1112         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
1113 }
1114
1115 static void pch_uart_stop_rx(struct uart_port *port)
1116 {
1117         struct eg20t_port *priv;
1118         priv = container_of(port, struct eg20t_port, port);
1119         priv->start_rx = 0;
1120         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT);
1121         priv->int_dis_flag = 1;
1122 }
1123
1124 /* Enable the modem status interrupts. */
1125 static void pch_uart_enable_ms(struct uart_port *port)
1126 {
1127         struct eg20t_port *priv;
1128         priv = container_of(port, struct eg20t_port, port);
1129         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_MS_INT);
1130 }
1131
1132 /* Control the transmission of a break signal. */
1133 static void pch_uart_break_ctl(struct uart_port *port, int ctl)
1134 {
1135         struct eg20t_port *priv;
1136         unsigned long flags;
1137
1138         priv = container_of(port, struct eg20t_port, port);
1139         spin_lock_irqsave(&port->lock, flags);
1140         pch_uart_hal_set_break(priv, ctl);
1141         spin_unlock_irqrestore(&port->lock, flags);
1142 }
1143
1144 /* Grab any interrupt resources and initialise any low level driver state. */
1145 static int pch_uart_startup(struct uart_port *port)
1146 {
1147         struct eg20t_port *priv;
1148         int ret;
1149         int fifo_size;
1150         int trigger_level;
1151
1152         priv = container_of(port, struct eg20t_port, port);
1153         priv->tx_empty = 1;
1154
1155         if (port->uartclk)
1156                 priv->base_baud = port->uartclk;
1157         else
1158                 port->uartclk = priv->base_baud;
1159
1160         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1161         ret = pch_uart_hal_set_line(priv, default_baud,
1162                               PCH_UART_HAL_PARITY_NONE, PCH_UART_HAL_8BIT,
1163                               PCH_UART_HAL_STB1);
1164         if (ret)
1165                 return ret;
1166
1167         switch (priv->fifo_size) {
1168         case 256:
1169                 fifo_size = PCH_UART_HAL_FIFO256;
1170                 break;
1171         case 64:
1172                 fifo_size = PCH_UART_HAL_FIFO64;
1173                 break;
1174         case 16:
1175                 fifo_size = PCH_UART_HAL_FIFO16;
1176         case 1:
1177         default:
1178                 fifo_size = PCH_UART_HAL_FIFO_DIS;
1179                 break;
1180         }
1181
1182         switch (priv->trigger) {
1183         case PCH_UART_HAL_TRIGGER1:
1184                 trigger_level = 1;
1185                 break;
1186         case PCH_UART_HAL_TRIGGER_L:
1187                 trigger_level = priv->fifo_size / 4;
1188                 break;
1189         case PCH_UART_HAL_TRIGGER_M:
1190                 trigger_level = priv->fifo_size / 2;
1191                 break;
1192         case PCH_UART_HAL_TRIGGER_H:
1193         default:
1194                 trigger_level = priv->fifo_size - (priv->fifo_size / 8);
1195                 break;
1196         }
1197
1198         priv->trigger_level = trigger_level;
1199         ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1200                                     fifo_size, priv->trigger);
1201         if (ret < 0)
1202                 return ret;
1203
1204         ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
1205                         KBUILD_MODNAME, priv);
1206         if (ret < 0)
1207                 return ret;
1208
1209         if (priv->use_dma)
1210                 pch_request_dma(port);
1211
1212         priv->start_rx = 1;
1213         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT);
1214         uart_update_timeout(port, CS8, default_baud);
1215
1216         return 0;
1217 }
1218
1219 static void pch_uart_shutdown(struct uart_port *port)
1220 {
1221         struct eg20t_port *priv;
1222         int ret;
1223
1224         priv = container_of(port, struct eg20t_port, port);
1225         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1226         pch_uart_hal_fifo_reset(priv, PCH_UART_HAL_CLR_ALL_FIFO);
1227         ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1228                               PCH_UART_HAL_FIFO_DIS, PCH_UART_HAL_TRIGGER1);
1229         if (ret)
1230                 dev_err(priv->port.dev,
1231                         "pch_uart_hal_set_fifo Failed(ret=%d)\n", ret);
1232
1233         pch_free_dma(port);
1234
1235         free_irq(priv->port.irq, priv);
1236 }
1237
1238 /* Change the port parameters, including word length, parity, stop
1239  *bits.  Update read_status_mask and ignore_status_mask to indicate
1240  *the types of events we are interested in receiving.  */
1241 static void pch_uart_set_termios(struct uart_port *port,
1242                                  struct ktermios *termios, struct ktermios *old)
1243 {
1244         int baud;
1245         int rtn;
1246         unsigned int parity, bits, stb;
1247         struct eg20t_port *priv;
1248         unsigned long flags;
1249
1250         priv = container_of(port, struct eg20t_port, port);
1251         switch (termios->c_cflag & CSIZE) {
1252         case CS5:
1253                 bits = PCH_UART_HAL_5BIT;
1254                 break;
1255         case CS6:
1256                 bits = PCH_UART_HAL_6BIT;
1257                 break;
1258         case CS7:
1259                 bits = PCH_UART_HAL_7BIT;
1260                 break;
1261         default:                /* CS8 */
1262                 bits = PCH_UART_HAL_8BIT;
1263                 break;
1264         }
1265         if (termios->c_cflag & CSTOPB)
1266                 stb = PCH_UART_HAL_STB2;
1267         else
1268                 stb = PCH_UART_HAL_STB1;
1269
1270         if (termios->c_cflag & PARENB) {
1271                 if (!(termios->c_cflag & PARODD))
1272                         parity = PCH_UART_HAL_PARITY_ODD;
1273                 else
1274                         parity = PCH_UART_HAL_PARITY_EVEN;
1275
1276         } else {
1277                 parity = PCH_UART_HAL_PARITY_NONE;
1278         }
1279
1280         /* Only UART0 has auto hardware flow function */
1281         if ((termios->c_cflag & CRTSCTS) && (priv->fifo_size == 256))
1282                 priv->mcr |= UART_MCR_AFE;
1283         else
1284                 priv->mcr &= ~UART_MCR_AFE;
1285
1286         termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
1287
1288         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
1289
1290         spin_lock_irqsave(&port->lock, flags);
1291
1292         uart_update_timeout(port, termios->c_cflag, baud);
1293         rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb);
1294         if (rtn)
1295                 goto out;
1296
1297         pch_uart_set_mctrl(&priv->port, priv->port.mctrl);
1298         /* Don't rewrite B0 */
1299         if (tty_termios_baud_rate(termios))
1300                 tty_termios_encode_baud_rate(termios, baud, baud);
1301
1302 out:
1303         spin_unlock_irqrestore(&port->lock, flags);
1304 }
1305
1306 static const char *pch_uart_type(struct uart_port *port)
1307 {
1308         return KBUILD_MODNAME;
1309 }
1310
1311 static void pch_uart_release_port(struct uart_port *port)
1312 {
1313         struct eg20t_port *priv;
1314
1315         priv = container_of(port, struct eg20t_port, port);
1316         pci_iounmap(priv->pdev, priv->membase);
1317         pci_release_regions(priv->pdev);
1318 }
1319
1320 static int pch_uart_request_port(struct uart_port *port)
1321 {
1322         struct eg20t_port *priv;
1323         int ret;
1324         void __iomem *membase;
1325
1326         priv = container_of(port, struct eg20t_port, port);
1327         ret = pci_request_regions(priv->pdev, KBUILD_MODNAME);
1328         if (ret < 0)
1329                 return -EBUSY;
1330
1331         membase = pci_iomap(priv->pdev, 1, 0);
1332         if (!membase) {
1333                 pci_release_regions(priv->pdev);
1334                 return -EBUSY;
1335         }
1336         priv->membase = port->membase = membase;
1337
1338         return 0;
1339 }
1340
1341 static void pch_uart_config_port(struct uart_port *port, int type)
1342 {
1343         struct eg20t_port *priv;
1344
1345         priv = container_of(port, struct eg20t_port, port);
1346         if (type & UART_CONFIG_TYPE) {
1347                 port->type = priv->port_type;
1348                 pch_uart_request_port(port);
1349         }
1350 }
1351
1352 static int pch_uart_verify_port(struct uart_port *port,
1353                                 struct serial_struct *serinfo)
1354 {
1355         struct eg20t_port *priv;
1356
1357         priv = container_of(port, struct eg20t_port, port);
1358         if (serinfo->flags & UPF_LOW_LATENCY) {
1359                 dev_info(priv->port.dev,
1360                         "PCH UART : Use PIO Mode (without DMA)\n");
1361                 priv->use_dma = 0;
1362                 serinfo->flags &= ~UPF_LOW_LATENCY;
1363         } else {
1364 #ifndef CONFIG_PCH_DMA
1365                 dev_err(priv->port.dev, "%s : PCH DMA is not Loaded.\n",
1366                         __func__);
1367                 return -EOPNOTSUPP;
1368 #endif
1369                 priv->use_dma = 1;
1370                 priv->use_dma_flag = 1;
1371                 dev_info(priv->port.dev, "PCH UART : Use DMA Mode\n");
1372         }
1373
1374         return 0;
1375 }
1376
1377 static struct uart_ops pch_uart_ops = {
1378         .tx_empty = pch_uart_tx_empty,
1379         .set_mctrl = pch_uart_set_mctrl,
1380         .get_mctrl = pch_uart_get_mctrl,
1381         .stop_tx = pch_uart_stop_tx,
1382         .start_tx = pch_uart_start_tx,
1383         .stop_rx = pch_uart_stop_rx,
1384         .enable_ms = pch_uart_enable_ms,
1385         .break_ctl = pch_uart_break_ctl,
1386         .startup = pch_uart_startup,
1387         .shutdown = pch_uart_shutdown,
1388         .set_termios = pch_uart_set_termios,
1389 /*      .pm             = pch_uart_pm,          Not supported yet */
1390 /*      .set_wake       = pch_uart_set_wake,    Not supported yet */
1391         .type = pch_uart_type,
1392         .release_port = pch_uart_release_port,
1393         .request_port = pch_uart_request_port,
1394         .config_port = pch_uart_config_port,
1395         .verify_port = pch_uart_verify_port
1396 };
1397
1398 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1399
1400 /*
1401  *      Wait for transmitter & holding register to empty
1402  */
1403 static void wait_for_xmitr(struct eg20t_port *up, int bits)
1404 {
1405         unsigned int status, tmout = 10000;
1406
1407         /* Wait up to 10ms for the character(s) to be sent. */
1408         for (;;) {
1409                 status = ioread8(up->membase + UART_LSR);
1410
1411                 if ((status & bits) == bits)
1412                         break;
1413                 if (--tmout == 0)
1414                         break;
1415                 udelay(1);
1416         }
1417
1418         /* Wait up to 1s for flow control if necessary */
1419         if (up->port.flags & UPF_CONS_FLOW) {
1420                 unsigned int tmout;
1421                 for (tmout = 1000000; tmout; tmout--) {
1422                         unsigned int msr = ioread8(up->membase + UART_MSR);
1423                         if (msr & UART_MSR_CTS)
1424                                 break;
1425                         udelay(1);
1426                         touch_nmi_watchdog();
1427                 }
1428         }
1429 }
1430
1431 static void pch_console_putchar(struct uart_port *port, int ch)
1432 {
1433         struct eg20t_port *priv =
1434                 container_of(port, struct eg20t_port, port);
1435
1436         wait_for_xmitr(priv, UART_LSR_THRE);
1437         iowrite8(ch, priv->membase + PCH_UART_THR);
1438 }
1439
1440 /*
1441  *      Print a string to the serial port trying not to disturb
1442  *      any possible real use of the port...
1443  *
1444  *      The console_lock must be held when we get here.
1445  */
1446 static void
1447 pch_console_write(struct console *co, const char *s, unsigned int count)
1448 {
1449         struct eg20t_port *priv;
1450
1451         unsigned long flags;
1452         u8 ier;
1453         int locked = 1;
1454
1455         priv = pch_uart_ports[co->index];
1456
1457         touch_nmi_watchdog();
1458
1459         local_irq_save(flags);
1460         if (priv->port.sysrq) {
1461                 /* serial8250_handle_port() already took the lock */
1462                 locked = 0;
1463         } else if (oops_in_progress) {
1464                 locked = spin_trylock(&priv->port.lock);
1465         } else
1466                 spin_lock(&priv->port.lock);
1467
1468         /*
1469          *      First save the IER then disable the interrupts
1470          */
1471         ier = ioread8(priv->membase + UART_IER);
1472
1473         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1474
1475         uart_console_write(&priv->port, s, count, pch_console_putchar);
1476
1477         /*
1478          *      Finally, wait for transmitter to become empty
1479          *      and restore the IER
1480          */
1481         wait_for_xmitr(priv, BOTH_EMPTY);
1482         iowrite8(ier, priv->membase + UART_IER);
1483
1484         if (locked)
1485                 spin_unlock(&priv->port.lock);
1486         local_irq_restore(flags);
1487 }
1488
1489 static int __init pch_console_setup(struct console *co, char *options)
1490 {
1491         struct uart_port *port;
1492         int baud = 9600;
1493         int bits = 8;
1494         int parity = 'n';
1495         int flow = 'n';
1496
1497         /*
1498          * Check whether an invalid uart number has been specified, and
1499          * if so, search for the first available port that does have
1500          * console support.
1501          */
1502         if (co->index >= PCH_UART_NR)
1503                 co->index = 0;
1504         port = &pch_uart_ports[co->index]->port;
1505
1506         if (!port || (!port->iobase && !port->membase))
1507                 return -ENODEV;
1508
1509         /* setup uartclock */
1510         port->uartclk = DEFAULT_BAUD_RATE;
1511
1512         if (options)
1513                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1514
1515         return uart_set_options(port, co, baud, parity, bits, flow);
1516 }
1517
1518 static struct uart_driver pch_uart_driver;
1519
1520 static struct console pch_console = {
1521         .name           = PCH_UART_DRIVER_DEVICE,
1522         .write          = pch_console_write,
1523         .device         = uart_console_device,
1524         .setup          = pch_console_setup,
1525         .flags          = CON_PRINTBUFFER | CON_ANYTIME,
1526         .index          = -1,
1527         .data           = &pch_uart_driver,
1528 };
1529
1530 #define PCH_CONSOLE     (&pch_console)
1531 #else
1532 #define PCH_CONSOLE     NULL
1533 #endif
1534
1535 static struct uart_driver pch_uart_driver = {
1536         .owner = THIS_MODULE,
1537         .driver_name = KBUILD_MODNAME,
1538         .dev_name = PCH_UART_DRIVER_DEVICE,
1539         .major = 0,
1540         .minor = 0,
1541         .nr = PCH_UART_NR,
1542         .cons = PCH_CONSOLE,
1543 };
1544
1545 static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
1546                                              const struct pci_device_id *id)
1547 {
1548         struct eg20t_port *priv;
1549         int ret;
1550         unsigned int iobase;
1551         unsigned int mapbase;
1552         unsigned char *rxbuf;
1553         int fifosize, base_baud;
1554         int port_type;
1555         struct pch_uart_driver_data *board;
1556         const char *board_name;
1557
1558         board = &drv_dat[id->driver_data];
1559         port_type = board->port_type;
1560
1561         priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
1562         if (priv == NULL)
1563                 goto init_port_alloc_err;
1564
1565         rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1566         if (!rxbuf)
1567                 goto init_port_free_txbuf;
1568
1569         base_baud = DEFAULT_BAUD_RATE;
1570
1571         /* quirk for CM-iTC board */
1572         board_name = dmi_get_system_info(DMI_BOARD_NAME);
1573         if (board_name && strstr(board_name, "CM-iTC"))
1574                 base_baud = 192000000; /* 192.0MHz */
1575
1576         switch (port_type) {
1577         case PORT_UNKNOWN:
1578                 fifosize = 256; /* EG20T/ML7213: UART0 */
1579                 break;
1580         case PORT_8250:
1581                 fifosize = 64; /* EG20T:UART1~3  ML7213: UART1~2*/
1582                 break;
1583         default:
1584                 dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type);
1585                 goto init_port_hal_free;
1586         }
1587
1588         pci_enable_msi(pdev);
1589
1590         iobase = pci_resource_start(pdev, 0);
1591         mapbase = pci_resource_start(pdev, 1);
1592         priv->mapbase = mapbase;
1593         priv->iobase = iobase;
1594         priv->pdev = pdev;
1595         priv->tx_empty = 1;
1596         priv->rxbuf.buf = rxbuf;
1597         priv->rxbuf.size = PAGE_SIZE;
1598
1599         priv->fifo_size = fifosize;
1600         priv->base_baud = base_baud;
1601         priv->port_type = PORT_MAX_8250 + port_type + 1;
1602         priv->port.dev = &pdev->dev;
1603         priv->port.iobase = iobase;
1604         priv->port.membase = NULL;
1605         priv->port.mapbase = mapbase;
1606         priv->port.irq = pdev->irq;
1607         priv->port.iotype = UPIO_PORT;
1608         priv->port.ops = &pch_uart_ops;
1609         priv->port.flags = UPF_BOOT_AUTOCONF;
1610         priv->port.fifosize = fifosize;
1611         priv->port.line = board->line_no;
1612         priv->trigger = PCH_UART_HAL_TRIGGER_M;
1613
1614         spin_lock_init(&priv->port.lock);
1615
1616         pci_set_drvdata(pdev, priv);
1617         pch_uart_hal_request(pdev, fifosize, base_baud);
1618
1619 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1620         pch_uart_ports[board->line_no] = priv;
1621 #endif
1622         ret = uart_add_one_port(&pch_uart_driver, &priv->port);
1623         if (ret < 0)
1624                 goto init_port_hal_free;
1625
1626         return priv;
1627
1628 init_port_hal_free:
1629 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1630         pch_uart_ports[board->line_no] = NULL;
1631 #endif
1632         free_page((unsigned long)rxbuf);
1633 init_port_free_txbuf:
1634         kfree(priv);
1635 init_port_alloc_err:
1636
1637         return NULL;
1638 }
1639
1640 static void pch_uart_exit_port(struct eg20t_port *priv)
1641 {
1642         uart_remove_one_port(&pch_uart_driver, &priv->port);
1643         pci_set_drvdata(priv->pdev, NULL);
1644         free_page((unsigned long)priv->rxbuf.buf);
1645 }
1646
1647 static void pch_uart_pci_remove(struct pci_dev *pdev)
1648 {
1649         struct eg20t_port *priv;
1650
1651         priv = (struct eg20t_port *)pci_get_drvdata(pdev);
1652
1653         pci_disable_msi(pdev);
1654
1655 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1656         pch_uart_ports[priv->port.line] = NULL;
1657 #endif
1658         pch_uart_exit_port(priv);
1659         pci_disable_device(pdev);
1660         kfree(priv);
1661         return;
1662 }
1663 #ifdef CONFIG_PM
1664 static int pch_uart_pci_suspend(struct pci_dev *pdev, pm_message_t state)
1665 {
1666         struct eg20t_port *priv = pci_get_drvdata(pdev);
1667
1668         uart_suspend_port(&pch_uart_driver, &priv->port);
1669
1670         pci_save_state(pdev);
1671         pci_set_power_state(pdev, pci_choose_state(pdev, state));
1672         return 0;
1673 }
1674
1675 static int pch_uart_pci_resume(struct pci_dev *pdev)
1676 {
1677         struct eg20t_port *priv = pci_get_drvdata(pdev);
1678         int ret;
1679
1680         pci_set_power_state(pdev, PCI_D0);
1681         pci_restore_state(pdev);
1682
1683         ret = pci_enable_device(pdev);
1684         if (ret) {
1685                 dev_err(&pdev->dev,
1686                 "%s-pci_enable_device failed(ret=%d) ", __func__, ret);
1687                 return ret;
1688         }
1689
1690         uart_resume_port(&pch_uart_driver, &priv->port);
1691
1692         return 0;
1693 }
1694 #else
1695 #define pch_uart_pci_suspend NULL
1696 #define pch_uart_pci_resume NULL
1697 #endif
1698
1699 static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = {
1700         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
1701          .driver_data = pch_et20t_uart0},
1702         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
1703          .driver_data = pch_et20t_uart1},
1704         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813),
1705          .driver_data = pch_et20t_uart2},
1706         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
1707          .driver_data = pch_et20t_uart3},
1708         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8027),
1709          .driver_data = pch_ml7213_uart0},
1710         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8028),
1711          .driver_data = pch_ml7213_uart1},
1712         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8029),
1713          .driver_data = pch_ml7213_uart2},
1714         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800C),
1715          .driver_data = pch_ml7223_uart0},
1716         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800D),
1717          .driver_data = pch_ml7223_uart1},
1718         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8811),
1719          .driver_data = pch_ml7831_uart0},
1720         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8812),
1721          .driver_data = pch_ml7831_uart1},
1722         {0,},
1723 };
1724
1725 static int __devinit pch_uart_pci_probe(struct pci_dev *pdev,
1726                                         const struct pci_device_id *id)
1727 {
1728         int ret;
1729         struct eg20t_port *priv;
1730
1731         ret = pci_enable_device(pdev);
1732         if (ret < 0)
1733                 goto probe_error;
1734
1735         priv = pch_uart_init_port(pdev, id);
1736         if (!priv) {
1737                 ret = -EBUSY;
1738                 goto probe_disable_device;
1739         }
1740         pci_set_drvdata(pdev, priv);
1741
1742         return ret;
1743
1744 probe_disable_device:
1745         pci_disable_msi(pdev);
1746         pci_disable_device(pdev);
1747 probe_error:
1748         return ret;
1749 }
1750
1751 static struct pci_driver pch_uart_pci_driver = {
1752         .name = "pch_uart",
1753         .id_table = pch_uart_pci_id,
1754         .probe = pch_uart_pci_probe,
1755         .remove = __devexit_p(pch_uart_pci_remove),
1756         .suspend = pch_uart_pci_suspend,
1757         .resume = pch_uart_pci_resume,
1758 };
1759
1760 static int __init pch_uart_module_init(void)
1761 {
1762         int ret;
1763
1764         /* register as UART driver */
1765         ret = uart_register_driver(&pch_uart_driver);
1766         if (ret < 0)
1767                 return ret;
1768
1769         /* register as PCI driver */
1770         ret = pci_register_driver(&pch_uart_pci_driver);
1771         if (ret < 0)
1772                 uart_unregister_driver(&pch_uart_driver);
1773
1774         return ret;
1775 }
1776 module_init(pch_uart_module_init);
1777
1778 static void __exit pch_uart_module_exit(void)
1779 {
1780         pci_unregister_driver(&pch_uart_pci_driver);
1781         uart_unregister_driver(&pch_uart_driver);
1782 }
1783 module_exit(pch_uart_module_exit);
1784
1785 MODULE_LICENSE("GPL v2");
1786 MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
1787 module_param(default_baud, uint, S_IRUGO);