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KVM: x86 emulator: Rename emulate_xxx() to em_xxx()
[deliverable/linux.git] / drivers / tty / serial / pch_uart.c
1 /*
2 *Copyright (C) 2010 OKI 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/serial_reg.h>
18 #include <linux/slab.h>
19 #include <linux/module.h>
20 #include <linux/pci.h>
21 #include <linux/serial_core.h>
22 #include <linux/interrupt.h>
23 #include <linux/io.h>
24 #include <linux/dmi.h>
25
26 #include <linux/dmaengine.h>
27 #include <linux/pch_dma.h>
28
29 enum {
30 PCH_UART_HANDLED_RX_INT_SHIFT,
31 PCH_UART_HANDLED_TX_INT_SHIFT,
32 PCH_UART_HANDLED_RX_ERR_INT_SHIFT,
33 PCH_UART_HANDLED_RX_TRG_INT_SHIFT,
34 PCH_UART_HANDLED_MS_INT_SHIFT,
35 };
36
37 enum {
38 PCH_UART_8LINE,
39 PCH_UART_2LINE,
40 };
41
42 #define PCH_UART_DRIVER_DEVICE "ttyPCH"
43
44 /* Set the max number of UART port
45 * Intel EG20T PCH: 4 port
46 * OKI SEMICONDUCTOR ML7213 IOH: 3 port
47 */
48 #define PCH_UART_NR 4
49
50 #define PCH_UART_HANDLED_RX_INT (1<<((PCH_UART_HANDLED_RX_INT_SHIFT)<<1))
51 #define PCH_UART_HANDLED_TX_INT (1<<((PCH_UART_HANDLED_TX_INT_SHIFT)<<1))
52 #define PCH_UART_HANDLED_RX_ERR_INT (1<<((\
53 PCH_UART_HANDLED_RX_ERR_INT_SHIFT)<<1))
54 #define PCH_UART_HANDLED_RX_TRG_INT (1<<((\
55 PCH_UART_HANDLED_RX_TRG_INT_SHIFT)<<1))
56 #define PCH_UART_HANDLED_MS_INT (1<<((PCH_UART_HANDLED_MS_INT_SHIFT)<<1))
57
58 #define PCH_UART_RBR 0x00
59 #define PCH_UART_THR 0x00
60
61 #define PCH_UART_IER_MASK (PCH_UART_IER_ERBFI|PCH_UART_IER_ETBEI|\
62 PCH_UART_IER_ELSI|PCH_UART_IER_EDSSI)
63 #define PCH_UART_IER_ERBFI 0x00000001
64 #define PCH_UART_IER_ETBEI 0x00000002
65 #define PCH_UART_IER_ELSI 0x00000004
66 #define PCH_UART_IER_EDSSI 0x00000008
67
68 #define PCH_UART_IIR_IP 0x00000001
69 #define PCH_UART_IIR_IID 0x00000006
70 #define PCH_UART_IIR_MSI 0x00000000
71 #define PCH_UART_IIR_TRI 0x00000002
72 #define PCH_UART_IIR_RRI 0x00000004
73 #define PCH_UART_IIR_REI 0x00000006
74 #define PCH_UART_IIR_TOI 0x00000008
75 #define PCH_UART_IIR_FIFO256 0x00000020
76 #define PCH_UART_IIR_FIFO64 PCH_UART_IIR_FIFO256
77 #define PCH_UART_IIR_FE 0x000000C0
78
79 #define PCH_UART_FCR_FIFOE 0x00000001
80 #define PCH_UART_FCR_RFR 0x00000002
81 #define PCH_UART_FCR_TFR 0x00000004
82 #define PCH_UART_FCR_DMS 0x00000008
83 #define PCH_UART_FCR_FIFO256 0x00000020
84 #define PCH_UART_FCR_RFTL 0x000000C0
85
86 #define PCH_UART_FCR_RFTL1 0x00000000
87 #define PCH_UART_FCR_RFTL64 0x00000040
88 #define PCH_UART_FCR_RFTL128 0x00000080
89 #define PCH_UART_FCR_RFTL224 0x000000C0
90 #define PCH_UART_FCR_RFTL16 PCH_UART_FCR_RFTL64
91 #define PCH_UART_FCR_RFTL32 PCH_UART_FCR_RFTL128
92 #define PCH_UART_FCR_RFTL56 PCH_UART_FCR_RFTL224
93 #define PCH_UART_FCR_RFTL4 PCH_UART_FCR_RFTL64
94 #define PCH_UART_FCR_RFTL8 PCH_UART_FCR_RFTL128
95 #define PCH_UART_FCR_RFTL14 PCH_UART_FCR_RFTL224
96 #define PCH_UART_FCR_RFTL_SHIFT 6
97
98 #define PCH_UART_LCR_WLS 0x00000003
99 #define PCH_UART_LCR_STB 0x00000004
100 #define PCH_UART_LCR_PEN 0x00000008
101 #define PCH_UART_LCR_EPS 0x00000010
102 #define PCH_UART_LCR_SP 0x00000020
103 #define PCH_UART_LCR_SB 0x00000040
104 #define PCH_UART_LCR_DLAB 0x00000080
105 #define PCH_UART_LCR_NP 0x00000000
106 #define PCH_UART_LCR_OP PCH_UART_LCR_PEN
107 #define PCH_UART_LCR_EP (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS)
108 #define PCH_UART_LCR_1P (PCH_UART_LCR_PEN | PCH_UART_LCR_SP)
109 #define PCH_UART_LCR_0P (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS |\
110 PCH_UART_LCR_SP)
111
112 #define PCH_UART_LCR_5BIT 0x00000000
113 #define PCH_UART_LCR_6BIT 0x00000001
114 #define PCH_UART_LCR_7BIT 0x00000002
115 #define PCH_UART_LCR_8BIT 0x00000003
116
117 #define PCH_UART_MCR_DTR 0x00000001
118 #define PCH_UART_MCR_RTS 0x00000002
119 #define PCH_UART_MCR_OUT 0x0000000C
120 #define PCH_UART_MCR_LOOP 0x00000010
121 #define PCH_UART_MCR_AFE 0x00000020
122
123 #define PCH_UART_LSR_DR 0x00000001
124 #define PCH_UART_LSR_ERR (1<<7)
125
126 #define PCH_UART_MSR_DCTS 0x00000001
127 #define PCH_UART_MSR_DDSR 0x00000002
128 #define PCH_UART_MSR_TERI 0x00000004
129 #define PCH_UART_MSR_DDCD 0x00000008
130 #define PCH_UART_MSR_CTS 0x00000010
131 #define PCH_UART_MSR_DSR 0x00000020
132 #define PCH_UART_MSR_RI 0x00000040
133 #define PCH_UART_MSR_DCD 0x00000080
134 #define PCH_UART_MSR_DELTA (PCH_UART_MSR_DCTS | PCH_UART_MSR_DDSR |\
135 PCH_UART_MSR_TERI | PCH_UART_MSR_DDCD)
136
137 #define PCH_UART_DLL 0x00
138 #define PCH_UART_DLM 0x01
139
140 #define DIV_ROUND(a, b) (((a) + ((b)/2)) / (b))
141
142 #define PCH_UART_IID_RLS (PCH_UART_IIR_REI)
143 #define PCH_UART_IID_RDR (PCH_UART_IIR_RRI)
144 #define PCH_UART_IID_RDR_TO (PCH_UART_IIR_RRI | PCH_UART_IIR_TOI)
145 #define PCH_UART_IID_THRE (PCH_UART_IIR_TRI)
146 #define PCH_UART_IID_MS (PCH_UART_IIR_MSI)
147
148 #define PCH_UART_HAL_PARITY_NONE (PCH_UART_LCR_NP)
149 #define PCH_UART_HAL_PARITY_ODD (PCH_UART_LCR_OP)
150 #define PCH_UART_HAL_PARITY_EVEN (PCH_UART_LCR_EP)
151 #define PCH_UART_HAL_PARITY_FIX1 (PCH_UART_LCR_1P)
152 #define PCH_UART_HAL_PARITY_FIX0 (PCH_UART_LCR_0P)
153 #define PCH_UART_HAL_5BIT (PCH_UART_LCR_5BIT)
154 #define PCH_UART_HAL_6BIT (PCH_UART_LCR_6BIT)
155 #define PCH_UART_HAL_7BIT (PCH_UART_LCR_7BIT)
156 #define PCH_UART_HAL_8BIT (PCH_UART_LCR_8BIT)
157 #define PCH_UART_HAL_STB1 0
158 #define PCH_UART_HAL_STB2 (PCH_UART_LCR_STB)
159
160 #define PCH_UART_HAL_CLR_TX_FIFO (PCH_UART_FCR_TFR)
161 #define PCH_UART_HAL_CLR_RX_FIFO (PCH_UART_FCR_RFR)
162 #define PCH_UART_HAL_CLR_ALL_FIFO (PCH_UART_HAL_CLR_TX_FIFO | \
163 PCH_UART_HAL_CLR_RX_FIFO)
164
165 #define PCH_UART_HAL_DMA_MODE0 0
166 #define PCH_UART_HAL_FIFO_DIS 0
167 #define PCH_UART_HAL_FIFO16 (PCH_UART_FCR_FIFOE)
168 #define PCH_UART_HAL_FIFO256 (PCH_UART_FCR_FIFOE | \
169 PCH_UART_FCR_FIFO256)
170 #define PCH_UART_HAL_FIFO64 (PCH_UART_HAL_FIFO256)
171 #define PCH_UART_HAL_TRIGGER1 (PCH_UART_FCR_RFTL1)
172 #define PCH_UART_HAL_TRIGGER64 (PCH_UART_FCR_RFTL64)
173 #define PCH_UART_HAL_TRIGGER128 (PCH_UART_FCR_RFTL128)
174 #define PCH_UART_HAL_TRIGGER224 (PCH_UART_FCR_RFTL224)
175 #define PCH_UART_HAL_TRIGGER16 (PCH_UART_FCR_RFTL16)
176 #define PCH_UART_HAL_TRIGGER32 (PCH_UART_FCR_RFTL32)
177 #define PCH_UART_HAL_TRIGGER56 (PCH_UART_FCR_RFTL56)
178 #define PCH_UART_HAL_TRIGGER4 (PCH_UART_FCR_RFTL4)
179 #define PCH_UART_HAL_TRIGGER8 (PCH_UART_FCR_RFTL8)
180 #define PCH_UART_HAL_TRIGGER14 (PCH_UART_FCR_RFTL14)
181 #define PCH_UART_HAL_TRIGGER_L (PCH_UART_FCR_RFTL64)
182 #define PCH_UART_HAL_TRIGGER_M (PCH_UART_FCR_RFTL128)
183 #define PCH_UART_HAL_TRIGGER_H (PCH_UART_FCR_RFTL224)
184
185 #define PCH_UART_HAL_RX_INT (PCH_UART_IER_ERBFI)
186 #define PCH_UART_HAL_TX_INT (PCH_UART_IER_ETBEI)
187 #define PCH_UART_HAL_RX_ERR_INT (PCH_UART_IER_ELSI)
188 #define PCH_UART_HAL_MS_INT (PCH_UART_IER_EDSSI)
189 #define PCH_UART_HAL_ALL_INT (PCH_UART_IER_MASK)
190
191 #define PCH_UART_HAL_DTR (PCH_UART_MCR_DTR)
192 #define PCH_UART_HAL_RTS (PCH_UART_MCR_RTS)
193 #define PCH_UART_HAL_OUT (PCH_UART_MCR_OUT)
194 #define PCH_UART_HAL_LOOP (PCH_UART_MCR_LOOP)
195 #define PCH_UART_HAL_AFE (PCH_UART_MCR_AFE)
196
197 #define PCI_VENDOR_ID_ROHM 0x10DB
198
199 struct pch_uart_buffer {
200 unsigned char *buf;
201 int size;
202 };
203
204 struct eg20t_port {
205 struct uart_port port;
206 int port_type;
207 void __iomem *membase;
208 resource_size_t mapbase;
209 unsigned int iobase;
210 struct pci_dev *pdev;
211 int fifo_size;
212 int base_baud;
213 int start_tx;
214 int start_rx;
215 int tx_empty;
216 int int_dis_flag;
217 int trigger;
218 int trigger_level;
219 struct pch_uart_buffer rxbuf;
220 unsigned int dmsr;
221 unsigned int fcr;
222 unsigned int mcr;
223 unsigned int use_dma;
224 unsigned int use_dma_flag;
225 struct dma_async_tx_descriptor *desc_tx;
226 struct dma_async_tx_descriptor *desc_rx;
227 struct pch_dma_slave param_tx;
228 struct pch_dma_slave param_rx;
229 struct dma_chan *chan_tx;
230 struct dma_chan *chan_rx;
231 struct scatterlist *sg_tx_p;
232 int nent;
233 struct scatterlist sg_rx;
234 int tx_dma_use;
235 void *rx_buf_virt;
236 dma_addr_t rx_buf_dma;
237 };
238
239 /**
240 * struct pch_uart_driver_data - private data structure for UART-DMA
241 * @port_type: The number of DMA channel
242 * @line_no: UART port line number (0, 1, 2...)
243 */
244 struct pch_uart_driver_data {
245 int port_type;
246 int line_no;
247 };
248
249 enum pch_uart_num_t {
250 pch_et20t_uart0 = 0,
251 pch_et20t_uart1,
252 pch_et20t_uart2,
253 pch_et20t_uart3,
254 pch_ml7213_uart0,
255 pch_ml7213_uart1,
256 pch_ml7213_uart2,
257 pch_ml7223_uart0,
258 pch_ml7223_uart1,
259 };
260
261 static struct pch_uart_driver_data drv_dat[] = {
262 [pch_et20t_uart0] = {PCH_UART_8LINE, 0},
263 [pch_et20t_uart1] = {PCH_UART_2LINE, 1},
264 [pch_et20t_uart2] = {PCH_UART_2LINE, 2},
265 [pch_et20t_uart3] = {PCH_UART_2LINE, 3},
266 [pch_ml7213_uart0] = {PCH_UART_8LINE, 0},
267 [pch_ml7213_uart1] = {PCH_UART_2LINE, 1},
268 [pch_ml7213_uart2] = {PCH_UART_2LINE, 2},
269 [pch_ml7223_uart0] = {PCH_UART_8LINE, 0},
270 [pch_ml7223_uart1] = {PCH_UART_2LINE, 1},
271 };
272
273 static unsigned int default_baud = 9600;
274 static const int trigger_level_256[4] = { 1, 64, 128, 224 };
275 static const int trigger_level_64[4] = { 1, 16, 32, 56 };
276 static const int trigger_level_16[4] = { 1, 4, 8, 14 };
277 static const int trigger_level_1[4] = { 1, 1, 1, 1 };
278
279 static void pch_uart_hal_request(struct pci_dev *pdev, int fifosize,
280 int base_baud)
281 {
282 struct eg20t_port *priv = pci_get_drvdata(pdev);
283
284 priv->trigger_level = 1;
285 priv->fcr = 0;
286 }
287
288 static unsigned int get_msr(struct eg20t_port *priv, void __iomem *base)
289 {
290 unsigned int msr = ioread8(base + UART_MSR);
291 priv->dmsr |= msr & PCH_UART_MSR_DELTA;
292
293 return msr;
294 }
295
296 static void pch_uart_hal_enable_interrupt(struct eg20t_port *priv,
297 unsigned int flag)
298 {
299 u8 ier = ioread8(priv->membase + UART_IER);
300 ier |= flag & PCH_UART_IER_MASK;
301 iowrite8(ier, priv->membase + UART_IER);
302 }
303
304 static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
305 unsigned int flag)
306 {
307 u8 ier = ioread8(priv->membase + UART_IER);
308 ier &= ~(flag & PCH_UART_IER_MASK);
309 iowrite8(ier, priv->membase + UART_IER);
310 }
311
312 static int pch_uart_hal_set_line(struct eg20t_port *priv, int baud,
313 unsigned int parity, unsigned int bits,
314 unsigned int stb)
315 {
316 unsigned int dll, dlm, lcr;
317 int div;
318
319 div = DIV_ROUND(priv->base_baud / 16, baud);
320 if (div < 0 || USHRT_MAX <= div) {
321 dev_err(priv->port.dev, "Invalid Baud(div=0x%x)\n", div);
322 return -EINVAL;
323 }
324
325 dll = (unsigned int)div & 0x00FFU;
326 dlm = ((unsigned int)div >> 8) & 0x00FFU;
327
328 if (parity & ~(PCH_UART_LCR_PEN | PCH_UART_LCR_EPS | PCH_UART_LCR_SP)) {
329 dev_err(priv->port.dev, "Invalid parity(0x%x)\n", parity);
330 return -EINVAL;
331 }
332
333 if (bits & ~PCH_UART_LCR_WLS) {
334 dev_err(priv->port.dev, "Invalid bits(0x%x)\n", bits);
335 return -EINVAL;
336 }
337
338 if (stb & ~PCH_UART_LCR_STB) {
339 dev_err(priv->port.dev, "Invalid STB(0x%x)\n", stb);
340 return -EINVAL;
341 }
342
343 lcr = parity;
344 lcr |= bits;
345 lcr |= stb;
346
347 dev_dbg(priv->port.dev, "%s:baud = %d, div = %04x, lcr = %02x (%lu)\n",
348 __func__, baud, div, lcr, jiffies);
349 iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
350 iowrite8(dll, priv->membase + PCH_UART_DLL);
351 iowrite8(dlm, priv->membase + PCH_UART_DLM);
352 iowrite8(lcr, priv->membase + UART_LCR);
353
354 return 0;
355 }
356
357 static int pch_uart_hal_fifo_reset(struct eg20t_port *priv,
358 unsigned int flag)
359 {
360 if (flag & ~(PCH_UART_FCR_TFR | PCH_UART_FCR_RFR)) {
361 dev_err(priv->port.dev, "%s:Invalid flag(0x%x)\n",
362 __func__, flag);
363 return -EINVAL;
364 }
365
366 iowrite8(PCH_UART_FCR_FIFOE | priv->fcr, priv->membase + UART_FCR);
367 iowrite8(PCH_UART_FCR_FIFOE | priv->fcr | flag,
368 priv->membase + UART_FCR);
369 iowrite8(priv->fcr, priv->membase + UART_FCR);
370
371 return 0;
372 }
373
374 static int pch_uart_hal_set_fifo(struct eg20t_port *priv,
375 unsigned int dmamode,
376 unsigned int fifo_size, unsigned int trigger)
377 {
378 u8 fcr;
379
380 if (dmamode & ~PCH_UART_FCR_DMS) {
381 dev_err(priv->port.dev, "%s:Invalid DMA Mode(0x%x)\n",
382 __func__, dmamode);
383 return -EINVAL;
384 }
385
386 if (fifo_size & ~(PCH_UART_FCR_FIFOE | PCH_UART_FCR_FIFO256)) {
387 dev_err(priv->port.dev, "%s:Invalid FIFO SIZE(0x%x)\n",
388 __func__, fifo_size);
389 return -EINVAL;
390 }
391
392 if (trigger & ~PCH_UART_FCR_RFTL) {
393 dev_err(priv->port.dev, "%s:Invalid TRIGGER(0x%x)\n",
394 __func__, trigger);
395 return -EINVAL;
396 }
397
398 switch (priv->fifo_size) {
399 case 256:
400 priv->trigger_level =
401 trigger_level_256[trigger >> PCH_UART_FCR_RFTL_SHIFT];
402 break;
403 case 64:
404 priv->trigger_level =
405 trigger_level_64[trigger >> PCH_UART_FCR_RFTL_SHIFT];
406 break;
407 case 16:
408 priv->trigger_level =
409 trigger_level_16[trigger >> PCH_UART_FCR_RFTL_SHIFT];
410 break;
411 default:
412 priv->trigger_level =
413 trigger_level_1[trigger >> PCH_UART_FCR_RFTL_SHIFT];
414 break;
415 }
416 fcr =
417 dmamode | fifo_size | trigger | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR;
418 iowrite8(PCH_UART_FCR_FIFOE, priv->membase + UART_FCR);
419 iowrite8(PCH_UART_FCR_FIFOE | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR,
420 priv->membase + UART_FCR);
421 iowrite8(fcr, priv->membase + UART_FCR);
422 priv->fcr = fcr;
423
424 return 0;
425 }
426
427 static u8 pch_uart_hal_get_modem(struct eg20t_port *priv)
428 {
429 priv->dmsr = 0;
430 return get_msr(priv, priv->membase);
431 }
432
433 static void pch_uart_hal_write(struct eg20t_port *priv,
434 const unsigned char *buf, int tx_size)
435 {
436 int i;
437 unsigned int thr;
438
439 for (i = 0; i < tx_size;) {
440 thr = buf[i++];
441 iowrite8(thr, priv->membase + PCH_UART_THR);
442 }
443 }
444
445 static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
446 int rx_size)
447 {
448 int i;
449 u8 rbr, lsr;
450
451 lsr = ioread8(priv->membase + UART_LSR);
452 for (i = 0, lsr = ioread8(priv->membase + UART_LSR);
453 i < rx_size && lsr & UART_LSR_DR;
454 lsr = ioread8(priv->membase + UART_LSR)) {
455 rbr = ioread8(priv->membase + PCH_UART_RBR);
456 buf[i++] = rbr;
457 }
458 return i;
459 }
460
461 static unsigned int pch_uart_hal_get_iid(struct eg20t_port *priv)
462 {
463 unsigned int iir;
464 int ret;
465
466 iir = ioread8(priv->membase + UART_IIR);
467 ret = (iir & (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP));
468 return ret;
469 }
470
471 static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
472 {
473 return ioread8(priv->membase + UART_LSR);
474 }
475
476 static void pch_uart_hal_set_break(struct eg20t_port *priv, int on)
477 {
478 unsigned int lcr;
479
480 lcr = ioread8(priv->membase + UART_LCR);
481 if (on)
482 lcr |= PCH_UART_LCR_SB;
483 else
484 lcr &= ~PCH_UART_LCR_SB;
485
486 iowrite8(lcr, priv->membase + UART_LCR);
487 }
488
489 static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
490 int size)
491 {
492 struct uart_port *port;
493 struct tty_struct *tty;
494
495 port = &priv->port;
496 tty = tty_port_tty_get(&port->state->port);
497 if (!tty) {
498 dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
499 return -EBUSY;
500 }
501
502 tty_insert_flip_string(tty, buf, size);
503 tty_flip_buffer_push(tty);
504 tty_kref_put(tty);
505
506 return 0;
507 }
508
509 static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf)
510 {
511 int ret;
512 struct uart_port *port = &priv->port;
513
514 if (port->x_char) {
515 dev_dbg(priv->port.dev, "%s:X character send %02x (%lu)\n",
516 __func__, port->x_char, jiffies);
517 buf[0] = port->x_char;
518 port->x_char = 0;
519 ret = 1;
520 } else {
521 ret = 0;
522 }
523
524 return ret;
525 }
526
527 static int dma_push_rx(struct eg20t_port *priv, int size)
528 {
529 struct tty_struct *tty;
530 int room;
531 struct uart_port *port = &priv->port;
532
533 port = &priv->port;
534 tty = tty_port_tty_get(&port->state->port);
535 if (!tty) {
536 dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
537 return 0;
538 }
539
540 room = tty_buffer_request_room(tty, size);
541
542 if (room < size)
543 dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
544 size - room);
545 if (!room)
546 return room;
547
548 tty_insert_flip_string(tty, sg_virt(&priv->sg_rx), size);
549
550 port->icount.rx += room;
551 tty_kref_put(tty);
552
553 return room;
554 }
555
556 static void pch_free_dma(struct uart_port *port)
557 {
558 struct eg20t_port *priv;
559 priv = container_of(port, struct eg20t_port, port);
560
561 if (priv->chan_tx) {
562 dma_release_channel(priv->chan_tx);
563 priv->chan_tx = NULL;
564 }
565 if (priv->chan_rx) {
566 dma_release_channel(priv->chan_rx);
567 priv->chan_rx = NULL;
568 }
569 if (sg_dma_address(&priv->sg_rx))
570 dma_free_coherent(port->dev, port->fifosize,
571 sg_virt(&priv->sg_rx),
572 sg_dma_address(&priv->sg_rx));
573
574 return;
575 }
576
577 static bool filter(struct dma_chan *chan, void *slave)
578 {
579 struct pch_dma_slave *param = slave;
580
581 if ((chan->chan_id == param->chan_id) && (param->dma_dev ==
582 chan->device->dev)) {
583 chan->private = param;
584 return true;
585 } else {
586 return false;
587 }
588 }
589
590 static void pch_request_dma(struct uart_port *port)
591 {
592 dma_cap_mask_t mask;
593 struct dma_chan *chan;
594 struct pci_dev *dma_dev;
595 struct pch_dma_slave *param;
596 struct eg20t_port *priv =
597 container_of(port, struct eg20t_port, port);
598 dma_cap_zero(mask);
599 dma_cap_set(DMA_SLAVE, mask);
600
601 dma_dev = pci_get_bus_and_slot(2, PCI_DEVFN(0xa, 0)); /* Get DMA's dev
602 information */
603 /* Set Tx DMA */
604 param = &priv->param_tx;
605 param->dma_dev = &dma_dev->dev;
606 param->chan_id = priv->port.line * 2; /* Tx = 0, 2, 4, ... */
607
608 param->tx_reg = port->mapbase + UART_TX;
609 chan = dma_request_channel(mask, filter, param);
610 if (!chan) {
611 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n",
612 __func__);
613 return;
614 }
615 priv->chan_tx = chan;
616
617 /* Set Rx DMA */
618 param = &priv->param_rx;
619 param->dma_dev = &dma_dev->dev;
620 param->chan_id = priv->port.line * 2 + 1; /* Rx = Tx + 1 */
621
622 param->rx_reg = port->mapbase + UART_RX;
623 chan = dma_request_channel(mask, filter, param);
624 if (!chan) {
625 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Rx)\n",
626 __func__);
627 dma_release_channel(priv->chan_tx);
628 return;
629 }
630
631 /* Get Consistent memory for DMA */
632 priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize,
633 &priv->rx_buf_dma, GFP_KERNEL);
634 priv->chan_rx = chan;
635 }
636
637 static void pch_dma_rx_complete(void *arg)
638 {
639 struct eg20t_port *priv = arg;
640 struct uart_port *port = &priv->port;
641 struct tty_struct *tty = tty_port_tty_get(&port->state->port);
642 int count;
643
644 if (!tty) {
645 dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
646 return;
647 }
648
649 dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE);
650 count = dma_push_rx(priv, priv->trigger_level);
651 if (count)
652 tty_flip_buffer_push(tty);
653 tty_kref_put(tty);
654 async_tx_ack(priv->desc_rx);
655 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT);
656 }
657
658 static void pch_dma_tx_complete(void *arg)
659 {
660 struct eg20t_port *priv = arg;
661 struct uart_port *port = &priv->port;
662 struct circ_buf *xmit = &port->state->xmit;
663 struct scatterlist *sg = priv->sg_tx_p;
664 int i;
665
666 for (i = 0; i < priv->nent; i++, sg++) {
667 xmit->tail += sg_dma_len(sg);
668 port->icount.tx += sg_dma_len(sg);
669 }
670 xmit->tail &= UART_XMIT_SIZE - 1;
671 async_tx_ack(priv->desc_tx);
672 dma_unmap_sg(port->dev, sg, priv->nent, DMA_TO_DEVICE);
673 priv->tx_dma_use = 0;
674 priv->nent = 0;
675 kfree(priv->sg_tx_p);
676 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
677 }
678
679 static int pop_tx(struct eg20t_port *priv, int size)
680 {
681 int count = 0;
682 struct uart_port *port = &priv->port;
683 struct circ_buf *xmit = &port->state->xmit;
684
685 if (uart_tx_stopped(port) || uart_circ_empty(xmit) || count >= size)
686 goto pop_tx_end;
687
688 do {
689 int cnt_to_end =
690 CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
691 int sz = min(size - count, cnt_to_end);
692 pch_uart_hal_write(priv, &xmit->buf[xmit->tail], sz);
693 xmit->tail = (xmit->tail + sz) & (UART_XMIT_SIZE - 1);
694 count += sz;
695 } while (!uart_circ_empty(xmit) && count < size);
696
697 pop_tx_end:
698 dev_dbg(priv->port.dev, "%d characters. Remained %d characters.(%lu)\n",
699 count, size - count, jiffies);
700
701 return count;
702 }
703
704 static int handle_rx_to(struct eg20t_port *priv)
705 {
706 struct pch_uart_buffer *buf;
707 int rx_size;
708 int ret;
709 if (!priv->start_rx) {
710 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT);
711 return 0;
712 }
713 buf = &priv->rxbuf;
714 do {
715 rx_size = pch_uart_hal_read(priv, buf->buf, buf->size);
716 ret = push_rx(priv, buf->buf, rx_size);
717 if (ret)
718 return 0;
719 } while (rx_size == buf->size);
720
721 return PCH_UART_HANDLED_RX_INT;
722 }
723
724 static int handle_rx(struct eg20t_port *priv)
725 {
726 return handle_rx_to(priv);
727 }
728
729 static int dma_handle_rx(struct eg20t_port *priv)
730 {
731 struct uart_port *port = &priv->port;
732 struct dma_async_tx_descriptor *desc;
733 struct scatterlist *sg;
734
735 priv = container_of(port, struct eg20t_port, port);
736 sg = &priv->sg_rx;
737
738 sg_init_table(&priv->sg_rx, 1); /* Initialize SG table */
739
740 sg_dma_len(sg) = priv->trigger_level;
741
742 sg_set_page(&priv->sg_rx, virt_to_page(priv->rx_buf_virt),
743 sg_dma_len(sg), (unsigned long)priv->rx_buf_virt &
744 ~PAGE_MASK);
745
746 sg_dma_address(sg) = priv->rx_buf_dma;
747
748 desc = priv->chan_rx->device->device_prep_slave_sg(priv->chan_rx,
749 sg, 1, DMA_FROM_DEVICE,
750 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
751
752 if (!desc)
753 return 0;
754
755 priv->desc_rx = desc;
756 desc->callback = pch_dma_rx_complete;
757 desc->callback_param = priv;
758 desc->tx_submit(desc);
759 dma_async_issue_pending(priv->chan_rx);
760
761 return PCH_UART_HANDLED_RX_INT;
762 }
763
764 static unsigned int handle_tx(struct eg20t_port *priv)
765 {
766 struct uart_port *port = &priv->port;
767 struct circ_buf *xmit = &port->state->xmit;
768 int fifo_size;
769 int tx_size;
770 int size;
771 int tx_empty;
772
773 if (!priv->start_tx) {
774 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
775 __func__, jiffies);
776 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
777 priv->tx_empty = 1;
778 return 0;
779 }
780
781 fifo_size = max(priv->fifo_size, 1);
782 tx_empty = 1;
783 if (pop_tx_x(priv, xmit->buf)) {
784 pch_uart_hal_write(priv, xmit->buf, 1);
785 port->icount.tx++;
786 tx_empty = 0;
787 fifo_size--;
788 }
789 size = min(xmit->head - xmit->tail, fifo_size);
790 if (size < 0)
791 size = fifo_size;
792
793 tx_size = pop_tx(priv, size);
794 if (tx_size > 0) {
795 port->icount.tx += tx_size;
796 tx_empty = 0;
797 }
798
799 priv->tx_empty = tx_empty;
800
801 if (tx_empty) {
802 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
803 uart_write_wakeup(port);
804 }
805
806 return PCH_UART_HANDLED_TX_INT;
807 }
808
809 static unsigned int dma_handle_tx(struct eg20t_port *priv)
810 {
811 struct uart_port *port = &priv->port;
812 struct circ_buf *xmit = &port->state->xmit;
813 struct scatterlist *sg;
814 int nent;
815 int fifo_size;
816 int tx_empty;
817 struct dma_async_tx_descriptor *desc;
818 int num;
819 int i;
820 int bytes;
821 int size;
822 int rem;
823
824 if (!priv->start_tx) {
825 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
826 __func__, jiffies);
827 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
828 priv->tx_empty = 1;
829 return 0;
830 }
831
832 if (priv->tx_dma_use) {
833 dev_dbg(priv->port.dev, "%s:Tx is not completed. (%lu)\n",
834 __func__, jiffies);
835 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
836 priv->tx_empty = 1;
837 return 0;
838 }
839
840 fifo_size = max(priv->fifo_size, 1);
841 tx_empty = 1;
842 if (pop_tx_x(priv, xmit->buf)) {
843 pch_uart_hal_write(priv, xmit->buf, 1);
844 port->icount.tx++;
845 tx_empty = 0;
846 fifo_size--;
847 }
848
849 bytes = min((int)CIRC_CNT(xmit->head, xmit->tail,
850 UART_XMIT_SIZE), CIRC_CNT_TO_END(xmit->head,
851 xmit->tail, UART_XMIT_SIZE));
852 if (!bytes) {
853 dev_dbg(priv->port.dev, "%s 0 bytes return\n", __func__);
854 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
855 uart_write_wakeup(port);
856 return 0;
857 }
858
859 if (bytes > fifo_size) {
860 num = bytes / fifo_size + 1;
861 size = fifo_size;
862 rem = bytes % fifo_size;
863 } else {
864 num = 1;
865 size = bytes;
866 rem = bytes;
867 }
868
869 dev_dbg(priv->port.dev, "%s num=%d size=%d rem=%d\n",
870 __func__, num, size, rem);
871
872 priv->tx_dma_use = 1;
873
874 priv->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
875
876 sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
877 sg = priv->sg_tx_p;
878
879 for (i = 0; i < num; i++, sg++) {
880 if (i == (num - 1))
881 sg_set_page(sg, virt_to_page(xmit->buf),
882 rem, fifo_size * i);
883 else
884 sg_set_page(sg, virt_to_page(xmit->buf),
885 size, fifo_size * i);
886 }
887
888 sg = priv->sg_tx_p;
889 nent = dma_map_sg(port->dev, sg, num, DMA_TO_DEVICE);
890 if (!nent) {
891 dev_err(priv->port.dev, "%s:dma_map_sg Failed\n", __func__);
892 return 0;
893 }
894 priv->nent = nent;
895
896 for (i = 0; i < nent; i++, sg++) {
897 sg->offset = (xmit->tail & (UART_XMIT_SIZE - 1)) +
898 fifo_size * i;
899 sg_dma_address(sg) = (sg_dma_address(sg) &
900 ~(UART_XMIT_SIZE - 1)) + sg->offset;
901 if (i == (nent - 1))
902 sg_dma_len(sg) = rem;
903 else
904 sg_dma_len(sg) = size;
905 }
906
907 desc = priv->chan_tx->device->device_prep_slave_sg(priv->chan_tx,
908 priv->sg_tx_p, nent, DMA_TO_DEVICE,
909 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
910 if (!desc) {
911 dev_err(priv->port.dev, "%s:device_prep_slave_sg Failed\n",
912 __func__);
913 return 0;
914 }
915 dma_sync_sg_for_device(port->dev, priv->sg_tx_p, nent, DMA_TO_DEVICE);
916 priv->desc_tx = desc;
917 desc->callback = pch_dma_tx_complete;
918 desc->callback_param = priv;
919
920 desc->tx_submit(desc);
921
922 dma_async_issue_pending(priv->chan_tx);
923
924 return PCH_UART_HANDLED_TX_INT;
925 }
926
927 static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
928 {
929 u8 fcr = ioread8(priv->membase + UART_FCR);
930
931 /* Reset FIFO */
932 fcr |= UART_FCR_CLEAR_RCVR;
933 iowrite8(fcr, priv->membase + UART_FCR);
934
935 if (lsr & PCH_UART_LSR_ERR)
936 dev_err(&priv->pdev->dev, "Error data in FIFO\n");
937
938 if (lsr & UART_LSR_FE)
939 dev_err(&priv->pdev->dev, "Framing Error\n");
940
941 if (lsr & UART_LSR_PE)
942 dev_err(&priv->pdev->dev, "Parity Error\n");
943
944 if (lsr & UART_LSR_OE)
945 dev_err(&priv->pdev->dev, "Overrun Error\n");
946 }
947
948 static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
949 {
950 struct eg20t_port *priv = dev_id;
951 unsigned int handled;
952 u8 lsr;
953 int ret = 0;
954 unsigned int iid;
955 unsigned long flags;
956
957 spin_lock_irqsave(&priv->port.lock, flags);
958 handled = 0;
959 while ((iid = pch_uart_hal_get_iid(priv)) > 1) {
960 switch (iid) {
961 case PCH_UART_IID_RLS: /* Receiver Line Status */
962 lsr = pch_uart_hal_get_line_status(priv);
963 if (lsr & (PCH_UART_LSR_ERR | UART_LSR_FE |
964 UART_LSR_PE | UART_LSR_OE)) {
965 pch_uart_err_ir(priv, lsr);
966 ret = PCH_UART_HANDLED_RX_ERR_INT;
967 }
968 break;
969 case PCH_UART_IID_RDR: /* Received Data Ready */
970 if (priv->use_dma) {
971 pch_uart_hal_disable_interrupt(priv,
972 PCH_UART_HAL_RX_INT);
973 ret = dma_handle_rx(priv);
974 if (!ret)
975 pch_uart_hal_enable_interrupt(priv,
976 PCH_UART_HAL_RX_INT);
977 } else {
978 ret = handle_rx(priv);
979 }
980 break;
981 case PCH_UART_IID_RDR_TO: /* Received Data Ready
982 (FIFO Timeout) */
983 ret = handle_rx_to(priv);
984 break;
985 case PCH_UART_IID_THRE: /* Transmitter Holding Register
986 Empty */
987 if (priv->use_dma)
988 ret = dma_handle_tx(priv);
989 else
990 ret = handle_tx(priv);
991 break;
992 case PCH_UART_IID_MS: /* Modem Status */
993 ret = PCH_UART_HANDLED_MS_INT;
994 break;
995 default: /* Never junp to this label */
996 dev_err(priv->port.dev, "%s:iid=%d (%lu)\n", __func__,
997 iid, jiffies);
998 ret = -1;
999 break;
1000 }
1001 handled |= (unsigned int)ret;
1002 }
1003 if (handled == 0 && iid <= 1) {
1004 if (priv->int_dis_flag)
1005 priv->int_dis_flag = 0;
1006 }
1007
1008 spin_unlock_irqrestore(&priv->port.lock, flags);
1009 return IRQ_RETVAL(handled);
1010 }
1011
1012 /* This function tests whether the transmitter fifo and shifter for the port
1013 described by 'port' is empty. */
1014 static unsigned int pch_uart_tx_empty(struct uart_port *port)
1015 {
1016 struct eg20t_port *priv;
1017 int ret;
1018 priv = container_of(port, struct eg20t_port, port);
1019 if (priv->tx_empty)
1020 ret = TIOCSER_TEMT;
1021 else
1022 ret = 0;
1023
1024 return ret;
1025 }
1026
1027 /* Returns the current state of modem control inputs. */
1028 static unsigned int pch_uart_get_mctrl(struct uart_port *port)
1029 {
1030 struct eg20t_port *priv;
1031 u8 modem;
1032 unsigned int ret = 0;
1033
1034 priv = container_of(port, struct eg20t_port, port);
1035 modem = pch_uart_hal_get_modem(priv);
1036
1037 if (modem & UART_MSR_DCD)
1038 ret |= TIOCM_CAR;
1039
1040 if (modem & UART_MSR_RI)
1041 ret |= TIOCM_RNG;
1042
1043 if (modem & UART_MSR_DSR)
1044 ret |= TIOCM_DSR;
1045
1046 if (modem & UART_MSR_CTS)
1047 ret |= TIOCM_CTS;
1048
1049 return ret;
1050 }
1051
1052 static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
1053 {
1054 u32 mcr = 0;
1055 struct eg20t_port *priv = container_of(port, struct eg20t_port, port);
1056
1057 if (mctrl & TIOCM_DTR)
1058 mcr |= UART_MCR_DTR;
1059 if (mctrl & TIOCM_RTS)
1060 mcr |= UART_MCR_RTS;
1061 if (mctrl & TIOCM_LOOP)
1062 mcr |= UART_MCR_LOOP;
1063
1064 if (priv->mcr & UART_MCR_AFE)
1065 mcr |= UART_MCR_AFE;
1066
1067 if (mctrl)
1068 iowrite8(mcr, priv->membase + UART_MCR);
1069 }
1070
1071 static void pch_uart_stop_tx(struct uart_port *port)
1072 {
1073 struct eg20t_port *priv;
1074 priv = container_of(port, struct eg20t_port, port);
1075 priv->start_tx = 0;
1076 priv->tx_dma_use = 0;
1077 }
1078
1079 static void pch_uart_start_tx(struct uart_port *port)
1080 {
1081 struct eg20t_port *priv;
1082
1083 priv = container_of(port, struct eg20t_port, port);
1084
1085 if (priv->use_dma) {
1086 if (priv->tx_dma_use) {
1087 dev_dbg(priv->port.dev, "%s : Tx DMA is NOT empty.\n",
1088 __func__);
1089 return;
1090 }
1091 }
1092
1093 priv->start_tx = 1;
1094 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
1095 }
1096
1097 static void pch_uart_stop_rx(struct uart_port *port)
1098 {
1099 struct eg20t_port *priv;
1100 priv = container_of(port, struct eg20t_port, port);
1101 priv->start_rx = 0;
1102 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT);
1103 priv->int_dis_flag = 1;
1104 }
1105
1106 /* Enable the modem status interrupts. */
1107 static void pch_uart_enable_ms(struct uart_port *port)
1108 {
1109 struct eg20t_port *priv;
1110 priv = container_of(port, struct eg20t_port, port);
1111 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_MS_INT);
1112 }
1113
1114 /* Control the transmission of a break signal. */
1115 static void pch_uart_break_ctl(struct uart_port *port, int ctl)
1116 {
1117 struct eg20t_port *priv;
1118 unsigned long flags;
1119
1120 priv = container_of(port, struct eg20t_port, port);
1121 spin_lock_irqsave(&port->lock, flags);
1122 pch_uart_hal_set_break(priv, ctl);
1123 spin_unlock_irqrestore(&port->lock, flags);
1124 }
1125
1126 /* Grab any interrupt resources and initialise any low level driver state. */
1127 static int pch_uart_startup(struct uart_port *port)
1128 {
1129 struct eg20t_port *priv;
1130 int ret;
1131 int fifo_size;
1132 int trigger_level;
1133
1134 priv = container_of(port, struct eg20t_port, port);
1135 priv->tx_empty = 1;
1136
1137 if (port->uartclk)
1138 priv->base_baud = port->uartclk;
1139 else
1140 port->uartclk = priv->base_baud;
1141
1142 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1143 ret = pch_uart_hal_set_line(priv, default_baud,
1144 PCH_UART_HAL_PARITY_NONE, PCH_UART_HAL_8BIT,
1145 PCH_UART_HAL_STB1);
1146 if (ret)
1147 return ret;
1148
1149 switch (priv->fifo_size) {
1150 case 256:
1151 fifo_size = PCH_UART_HAL_FIFO256;
1152 break;
1153 case 64:
1154 fifo_size = PCH_UART_HAL_FIFO64;
1155 break;
1156 case 16:
1157 fifo_size = PCH_UART_HAL_FIFO16;
1158 case 1:
1159 default:
1160 fifo_size = PCH_UART_HAL_FIFO_DIS;
1161 break;
1162 }
1163
1164 switch (priv->trigger) {
1165 case PCH_UART_HAL_TRIGGER1:
1166 trigger_level = 1;
1167 break;
1168 case PCH_UART_HAL_TRIGGER_L:
1169 trigger_level = priv->fifo_size / 4;
1170 break;
1171 case PCH_UART_HAL_TRIGGER_M:
1172 trigger_level = priv->fifo_size / 2;
1173 break;
1174 case PCH_UART_HAL_TRIGGER_H:
1175 default:
1176 trigger_level = priv->fifo_size - (priv->fifo_size / 8);
1177 break;
1178 }
1179
1180 priv->trigger_level = trigger_level;
1181 ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1182 fifo_size, priv->trigger);
1183 if (ret < 0)
1184 return ret;
1185
1186 ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
1187 KBUILD_MODNAME, priv);
1188 if (ret < 0)
1189 return ret;
1190
1191 if (priv->use_dma)
1192 pch_request_dma(port);
1193
1194 priv->start_rx = 1;
1195 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT);
1196 uart_update_timeout(port, CS8, default_baud);
1197
1198 return 0;
1199 }
1200
1201 static void pch_uart_shutdown(struct uart_port *port)
1202 {
1203 struct eg20t_port *priv;
1204 int ret;
1205
1206 priv = container_of(port, struct eg20t_port, port);
1207 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1208 pch_uart_hal_fifo_reset(priv, PCH_UART_HAL_CLR_ALL_FIFO);
1209 ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1210 PCH_UART_HAL_FIFO_DIS, PCH_UART_HAL_TRIGGER1);
1211 if (ret)
1212 dev_err(priv->port.dev,
1213 "pch_uart_hal_set_fifo Failed(ret=%d)\n", ret);
1214
1215 if (priv->use_dma_flag)
1216 pch_free_dma(port);
1217
1218 free_irq(priv->port.irq, priv);
1219 }
1220
1221 /* Change the port parameters, including word length, parity, stop
1222 *bits. Update read_status_mask and ignore_status_mask to indicate
1223 *the types of events we are interested in receiving. */
1224 static void pch_uart_set_termios(struct uart_port *port,
1225 struct ktermios *termios, struct ktermios *old)
1226 {
1227 int baud;
1228 int rtn;
1229 unsigned int parity, bits, stb;
1230 struct eg20t_port *priv;
1231 unsigned long flags;
1232
1233 priv = container_of(port, struct eg20t_port, port);
1234 switch (termios->c_cflag & CSIZE) {
1235 case CS5:
1236 bits = PCH_UART_HAL_5BIT;
1237 break;
1238 case CS6:
1239 bits = PCH_UART_HAL_6BIT;
1240 break;
1241 case CS7:
1242 bits = PCH_UART_HAL_7BIT;
1243 break;
1244 default: /* CS8 */
1245 bits = PCH_UART_HAL_8BIT;
1246 break;
1247 }
1248 if (termios->c_cflag & CSTOPB)
1249 stb = PCH_UART_HAL_STB2;
1250 else
1251 stb = PCH_UART_HAL_STB1;
1252
1253 if (termios->c_cflag & PARENB) {
1254 if (!(termios->c_cflag & PARODD))
1255 parity = PCH_UART_HAL_PARITY_ODD;
1256 else
1257 parity = PCH_UART_HAL_PARITY_EVEN;
1258
1259 } else {
1260 parity = PCH_UART_HAL_PARITY_NONE;
1261 }
1262
1263 /* Only UART0 has auto hardware flow function */
1264 if ((termios->c_cflag & CRTSCTS) && (priv->fifo_size == 256))
1265 priv->mcr |= UART_MCR_AFE;
1266 else
1267 priv->mcr &= ~UART_MCR_AFE;
1268
1269 termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
1270
1271 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
1272
1273 spin_lock_irqsave(&port->lock, flags);
1274
1275 uart_update_timeout(port, termios->c_cflag, baud);
1276 rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb);
1277 if (rtn)
1278 goto out;
1279
1280 /* Don't rewrite B0 */
1281 if (tty_termios_baud_rate(termios))
1282 tty_termios_encode_baud_rate(termios, baud, baud);
1283
1284 out:
1285 spin_unlock_irqrestore(&port->lock, flags);
1286 }
1287
1288 static const char *pch_uart_type(struct uart_port *port)
1289 {
1290 return KBUILD_MODNAME;
1291 }
1292
1293 static void pch_uart_release_port(struct uart_port *port)
1294 {
1295 struct eg20t_port *priv;
1296
1297 priv = container_of(port, struct eg20t_port, port);
1298 pci_iounmap(priv->pdev, priv->membase);
1299 pci_release_regions(priv->pdev);
1300 }
1301
1302 static int pch_uart_request_port(struct uart_port *port)
1303 {
1304 struct eg20t_port *priv;
1305 int ret;
1306 void __iomem *membase;
1307
1308 priv = container_of(port, struct eg20t_port, port);
1309 ret = pci_request_regions(priv->pdev, KBUILD_MODNAME);
1310 if (ret < 0)
1311 return -EBUSY;
1312
1313 membase = pci_iomap(priv->pdev, 1, 0);
1314 if (!membase) {
1315 pci_release_regions(priv->pdev);
1316 return -EBUSY;
1317 }
1318 priv->membase = port->membase = membase;
1319
1320 return 0;
1321 }
1322
1323 static void pch_uart_config_port(struct uart_port *port, int type)
1324 {
1325 struct eg20t_port *priv;
1326
1327 priv = container_of(port, struct eg20t_port, port);
1328 if (type & UART_CONFIG_TYPE) {
1329 port->type = priv->port_type;
1330 pch_uart_request_port(port);
1331 }
1332 }
1333
1334 static int pch_uart_verify_port(struct uart_port *port,
1335 struct serial_struct *serinfo)
1336 {
1337 struct eg20t_port *priv;
1338
1339 priv = container_of(port, struct eg20t_port, port);
1340 if (serinfo->flags & UPF_LOW_LATENCY) {
1341 dev_info(priv->port.dev,
1342 "PCH UART : Use PIO Mode (without DMA)\n");
1343 priv->use_dma = 0;
1344 serinfo->flags &= ~UPF_LOW_LATENCY;
1345 } else {
1346 #ifndef CONFIG_PCH_DMA
1347 dev_err(priv->port.dev, "%s : PCH DMA is not Loaded.\n",
1348 __func__);
1349 return -EOPNOTSUPP;
1350 #endif
1351 priv->use_dma = 1;
1352 priv->use_dma_flag = 1;
1353 dev_info(priv->port.dev, "PCH UART : Use DMA Mode\n");
1354 }
1355
1356 return 0;
1357 }
1358
1359 static struct uart_ops pch_uart_ops = {
1360 .tx_empty = pch_uart_tx_empty,
1361 .set_mctrl = pch_uart_set_mctrl,
1362 .get_mctrl = pch_uart_get_mctrl,
1363 .stop_tx = pch_uart_stop_tx,
1364 .start_tx = pch_uart_start_tx,
1365 .stop_rx = pch_uart_stop_rx,
1366 .enable_ms = pch_uart_enable_ms,
1367 .break_ctl = pch_uart_break_ctl,
1368 .startup = pch_uart_startup,
1369 .shutdown = pch_uart_shutdown,
1370 .set_termios = pch_uart_set_termios,
1371 /* .pm = pch_uart_pm, Not supported yet */
1372 /* .set_wake = pch_uart_set_wake, Not supported yet */
1373 .type = pch_uart_type,
1374 .release_port = pch_uart_release_port,
1375 .request_port = pch_uart_request_port,
1376 .config_port = pch_uart_config_port,
1377 .verify_port = pch_uart_verify_port
1378 };
1379
1380 static struct uart_driver pch_uart_driver = {
1381 .owner = THIS_MODULE,
1382 .driver_name = KBUILD_MODNAME,
1383 .dev_name = PCH_UART_DRIVER_DEVICE,
1384 .major = 0,
1385 .minor = 0,
1386 .nr = PCH_UART_NR,
1387 };
1388
1389 static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
1390 const struct pci_device_id *id)
1391 {
1392 struct eg20t_port *priv;
1393 int ret;
1394 unsigned int iobase;
1395 unsigned int mapbase;
1396 unsigned char *rxbuf;
1397 int fifosize, base_baud;
1398 int port_type;
1399 struct pch_uart_driver_data *board;
1400 const char *board_name;
1401
1402 board = &drv_dat[id->driver_data];
1403 port_type = board->port_type;
1404
1405 priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
1406 if (priv == NULL)
1407 goto init_port_alloc_err;
1408
1409 rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1410 if (!rxbuf)
1411 goto init_port_free_txbuf;
1412
1413 base_baud = 1843200; /* 1.8432MHz */
1414
1415 /* quirk for CM-iTC board */
1416 board_name = dmi_get_system_info(DMI_BOARD_NAME);
1417 if (board_name && strstr(board_name, "CM-iTC"))
1418 base_baud = 192000000; /* 192.0MHz */
1419
1420 switch (port_type) {
1421 case PORT_UNKNOWN:
1422 fifosize = 256; /* EG20T/ML7213: UART0 */
1423 break;
1424 case PORT_8250:
1425 fifosize = 64; /* EG20T:UART1~3 ML7213: UART1~2*/
1426 break;
1427 default:
1428 dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type);
1429 goto init_port_hal_free;
1430 }
1431
1432 iobase = pci_resource_start(pdev, 0);
1433 mapbase = pci_resource_start(pdev, 1);
1434 priv->mapbase = mapbase;
1435 priv->iobase = iobase;
1436 priv->pdev = pdev;
1437 priv->tx_empty = 1;
1438 priv->rxbuf.buf = rxbuf;
1439 priv->rxbuf.size = PAGE_SIZE;
1440
1441 priv->fifo_size = fifosize;
1442 priv->base_baud = base_baud;
1443 priv->port_type = PORT_MAX_8250 + port_type + 1;
1444 priv->port.dev = &pdev->dev;
1445 priv->port.iobase = iobase;
1446 priv->port.membase = NULL;
1447 priv->port.mapbase = mapbase;
1448 priv->port.irq = pdev->irq;
1449 priv->port.iotype = UPIO_PORT;
1450 priv->port.ops = &pch_uart_ops;
1451 priv->port.flags = UPF_BOOT_AUTOCONF;
1452 priv->port.fifosize = fifosize;
1453 priv->port.line = board->line_no;
1454 priv->trigger = PCH_UART_HAL_TRIGGER_M;
1455
1456 spin_lock_init(&priv->port.lock);
1457
1458 pci_set_drvdata(pdev, priv);
1459 pch_uart_hal_request(pdev, fifosize, base_baud);
1460
1461 ret = uart_add_one_port(&pch_uart_driver, &priv->port);
1462 if (ret < 0)
1463 goto init_port_hal_free;
1464
1465 return priv;
1466
1467 init_port_hal_free:
1468 free_page((unsigned long)rxbuf);
1469 init_port_free_txbuf:
1470 kfree(priv);
1471 init_port_alloc_err:
1472
1473 return NULL;
1474 }
1475
1476 static void pch_uart_exit_port(struct eg20t_port *priv)
1477 {
1478 uart_remove_one_port(&pch_uart_driver, &priv->port);
1479 pci_set_drvdata(priv->pdev, NULL);
1480 free_page((unsigned long)priv->rxbuf.buf);
1481 }
1482
1483 static void pch_uart_pci_remove(struct pci_dev *pdev)
1484 {
1485 struct eg20t_port *priv;
1486
1487 priv = (struct eg20t_port *)pci_get_drvdata(pdev);
1488 pch_uart_exit_port(priv);
1489 pci_disable_device(pdev);
1490 kfree(priv);
1491 return;
1492 }
1493 #ifdef CONFIG_PM
1494 static int pch_uart_pci_suspend(struct pci_dev *pdev, pm_message_t state)
1495 {
1496 struct eg20t_port *priv = pci_get_drvdata(pdev);
1497
1498 uart_suspend_port(&pch_uart_driver, &priv->port);
1499
1500 pci_save_state(pdev);
1501 pci_set_power_state(pdev, pci_choose_state(pdev, state));
1502 return 0;
1503 }
1504
1505 static int pch_uart_pci_resume(struct pci_dev *pdev)
1506 {
1507 struct eg20t_port *priv = pci_get_drvdata(pdev);
1508 int ret;
1509
1510 pci_set_power_state(pdev, PCI_D0);
1511 pci_restore_state(pdev);
1512
1513 ret = pci_enable_device(pdev);
1514 if (ret) {
1515 dev_err(&pdev->dev,
1516 "%s-pci_enable_device failed(ret=%d) ", __func__, ret);
1517 return ret;
1518 }
1519
1520 uart_resume_port(&pch_uart_driver, &priv->port);
1521
1522 return 0;
1523 }
1524 #else
1525 #define pch_uart_pci_suspend NULL
1526 #define pch_uart_pci_resume NULL
1527 #endif
1528
1529 static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = {
1530 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
1531 .driver_data = pch_et20t_uart0},
1532 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
1533 .driver_data = pch_et20t_uart1},
1534 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813),
1535 .driver_data = pch_et20t_uart2},
1536 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
1537 .driver_data = pch_et20t_uart3},
1538 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8027),
1539 .driver_data = pch_ml7213_uart0},
1540 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8028),
1541 .driver_data = pch_ml7213_uart1},
1542 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8029),
1543 .driver_data = pch_ml7213_uart2},
1544 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800C),
1545 .driver_data = pch_ml7223_uart0},
1546 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800D),
1547 .driver_data = pch_ml7223_uart1},
1548 {0,},
1549 };
1550
1551 static int __devinit pch_uart_pci_probe(struct pci_dev *pdev,
1552 const struct pci_device_id *id)
1553 {
1554 int ret;
1555 struct eg20t_port *priv;
1556
1557 ret = pci_enable_device(pdev);
1558 if (ret < 0)
1559 goto probe_error;
1560
1561 priv = pch_uart_init_port(pdev, id);
1562 if (!priv) {
1563 ret = -EBUSY;
1564 goto probe_disable_device;
1565 }
1566 pci_set_drvdata(pdev, priv);
1567
1568 return ret;
1569
1570 probe_disable_device:
1571 pci_disable_device(pdev);
1572 probe_error:
1573 return ret;
1574 }
1575
1576 static struct pci_driver pch_uart_pci_driver = {
1577 .name = "pch_uart",
1578 .id_table = pch_uart_pci_id,
1579 .probe = pch_uart_pci_probe,
1580 .remove = __devexit_p(pch_uart_pci_remove),
1581 .suspend = pch_uart_pci_suspend,
1582 .resume = pch_uart_pci_resume,
1583 };
1584
1585 static int __init pch_uart_module_init(void)
1586 {
1587 int ret;
1588
1589 /* register as UART driver */
1590 ret = uart_register_driver(&pch_uart_driver);
1591 if (ret < 0)
1592 return ret;
1593
1594 /* register as PCI driver */
1595 ret = pci_register_driver(&pch_uart_pci_driver);
1596 if (ret < 0)
1597 uart_unregister_driver(&pch_uart_driver);
1598
1599 return ret;
1600 }
1601 module_init(pch_uart_module_init);
1602
1603 static void __exit pch_uart_module_exit(void)
1604 {
1605 pci_unregister_driver(&pch_uart_pci_driver);
1606 uart_unregister_driver(&pch_uart_driver);
1607 }
1608 module_exit(pch_uart_module_exit);
1609
1610 MODULE_LICENSE("GPL v2");
1611 MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
1612 module_param(default_baud, uint, S_IRUGO);
Linux kernel - Deliverables
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