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path: root/drivers/tty/serial/pch_uart.c
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-rw-r--r--drivers/tty/serial/pch_uart.c1451
1 files changed, 1451 insertions, 0 deletions
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
new file mode 100644
index 000000000000..70a61458ec42
--- /dev/null
+++ b/drivers/tty/serial/pch_uart.c
@@ -0,0 +1,1451 @@
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/pci.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
25#include <linux/dmaengine.h>
26#include <linux/pch_dma.h>
27
28enum {
29 PCH_UART_HANDLED_RX_INT_SHIFT,
30 PCH_UART_HANDLED_TX_INT_SHIFT,
31 PCH_UART_HANDLED_RX_ERR_INT_SHIFT,
32 PCH_UART_HANDLED_RX_TRG_INT_SHIFT,
33 PCH_UART_HANDLED_MS_INT_SHIFT,
34};
35
36enum {
37 PCH_UART_8LINE,
38 PCH_UART_2LINE,
39};
40
41#define PCH_UART_DRIVER_DEVICE "ttyPCH"
42
43#define PCH_UART_NR_GE_256FIFO 1
44#define PCH_UART_NR_GE_64FIFO 3
45#define PCH_UART_NR_GE (PCH_UART_NR_GE_256FIFO+PCH_UART_NR_GE_64FIFO)
46#define PCH_UART_NR PCH_UART_NR_GE
47
48#define PCH_UART_HANDLED_RX_INT (1<<((PCH_UART_HANDLED_RX_INT_SHIFT)<<1))
49#define PCH_UART_HANDLED_TX_INT (1<<((PCH_UART_HANDLED_TX_INT_SHIFT)<<1))
50#define PCH_UART_HANDLED_RX_ERR_INT (1<<((\
51 PCH_UART_HANDLED_RX_ERR_INT_SHIFT)<<1))
52#define PCH_UART_HANDLED_RX_TRG_INT (1<<((\
53 PCH_UART_HANDLED_RX_TRG_INT_SHIFT)<<1))
54#define PCH_UART_HANDLED_MS_INT (1<<((PCH_UART_HANDLED_MS_INT_SHIFT)<<1))
55
56#define PCH_UART_RBR 0x00
57#define PCH_UART_THR 0x00
58
59#define PCH_UART_IER_MASK (PCH_UART_IER_ERBFI|PCH_UART_IER_ETBEI|\
60 PCH_UART_IER_ELSI|PCH_UART_IER_EDSSI)
61#define PCH_UART_IER_ERBFI 0x00000001
62#define PCH_UART_IER_ETBEI 0x00000002
63#define PCH_UART_IER_ELSI 0x00000004
64#define PCH_UART_IER_EDSSI 0x00000008
65
66#define PCH_UART_IIR_IP 0x00000001
67#define PCH_UART_IIR_IID 0x00000006
68#define PCH_UART_IIR_MSI 0x00000000
69#define PCH_UART_IIR_TRI 0x00000002
70#define PCH_UART_IIR_RRI 0x00000004
71#define PCH_UART_IIR_REI 0x00000006
72#define PCH_UART_IIR_TOI 0x00000008
73#define PCH_UART_IIR_FIFO256 0x00000020
74#define PCH_UART_IIR_FIFO64 PCH_UART_IIR_FIFO256
75#define PCH_UART_IIR_FE 0x000000C0
76
77#define PCH_UART_FCR_FIFOE 0x00000001
78#define PCH_UART_FCR_RFR 0x00000002
79#define PCH_UART_FCR_TFR 0x00000004
80#define PCH_UART_FCR_DMS 0x00000008
81#define PCH_UART_FCR_FIFO256 0x00000020
82#define PCH_UART_FCR_RFTL 0x000000C0
83
84#define PCH_UART_FCR_RFTL1 0x00000000
85#define PCH_UART_FCR_RFTL64 0x00000040
86#define PCH_UART_FCR_RFTL128 0x00000080
87#define PCH_UART_FCR_RFTL224 0x000000C0
88#define PCH_UART_FCR_RFTL16 PCH_UART_FCR_RFTL64
89#define PCH_UART_FCR_RFTL32 PCH_UART_FCR_RFTL128
90#define PCH_UART_FCR_RFTL56 PCH_UART_FCR_RFTL224
91#define PCH_UART_FCR_RFTL4 PCH_UART_FCR_RFTL64
92#define PCH_UART_FCR_RFTL8 PCH_UART_FCR_RFTL128
93#define PCH_UART_FCR_RFTL14 PCH_UART_FCR_RFTL224
94#define PCH_UART_FCR_RFTL_SHIFT 6
95
96#define PCH_UART_LCR_WLS 0x00000003
97#define PCH_UART_LCR_STB 0x00000004
98#define PCH_UART_LCR_PEN 0x00000008
99#define PCH_UART_LCR_EPS 0x00000010
100#define PCH_UART_LCR_SP 0x00000020
101#define PCH_UART_LCR_SB 0x00000040
102#define PCH_UART_LCR_DLAB 0x00000080
103#define PCH_UART_LCR_NP 0x00000000
104#define PCH_UART_LCR_OP PCH_UART_LCR_PEN
105#define PCH_UART_LCR_EP (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS)
106#define PCH_UART_LCR_1P (PCH_UART_LCR_PEN | PCH_UART_LCR_SP)
107#define PCH_UART_LCR_0P (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS |\
108 PCH_UART_LCR_SP)
109
110#define PCH_UART_LCR_5BIT 0x00000000
111#define PCH_UART_LCR_6BIT 0x00000001
112#define PCH_UART_LCR_7BIT 0x00000002
113#define PCH_UART_LCR_8BIT 0x00000003
114
115#define PCH_UART_MCR_DTR 0x00000001
116#define PCH_UART_MCR_RTS 0x00000002
117#define PCH_UART_MCR_OUT 0x0000000C
118#define PCH_UART_MCR_LOOP 0x00000010
119#define PCH_UART_MCR_AFE 0x00000020
120
121#define PCH_UART_LSR_DR 0x00000001
122#define PCH_UART_LSR_ERR (1<<7)
123
124#define PCH_UART_MSR_DCTS 0x00000001
125#define PCH_UART_MSR_DDSR 0x00000002
126#define PCH_UART_MSR_TERI 0x00000004
127#define PCH_UART_MSR_DDCD 0x00000008
128#define PCH_UART_MSR_CTS 0x00000010
129#define PCH_UART_MSR_DSR 0x00000020
130#define PCH_UART_MSR_RI 0x00000040
131#define PCH_UART_MSR_DCD 0x00000080
132#define PCH_UART_MSR_DELTA (PCH_UART_MSR_DCTS | PCH_UART_MSR_DDSR |\
133 PCH_UART_MSR_TERI | PCH_UART_MSR_DDCD)
134
135#define PCH_UART_DLL 0x00
136#define PCH_UART_DLM 0x01
137
138#define DIV_ROUND(a, b) (((a) + ((b)/2)) / (b))
139
140#define PCH_UART_IID_RLS (PCH_UART_IIR_REI)
141#define PCH_UART_IID_RDR (PCH_UART_IIR_RRI)
142#define PCH_UART_IID_RDR_TO (PCH_UART_IIR_RRI | PCH_UART_IIR_TOI)
143#define PCH_UART_IID_THRE (PCH_UART_IIR_TRI)
144#define PCH_UART_IID_MS (PCH_UART_IIR_MSI)
145
146#define PCH_UART_HAL_PARITY_NONE (PCH_UART_LCR_NP)
147#define PCH_UART_HAL_PARITY_ODD (PCH_UART_LCR_OP)
148#define PCH_UART_HAL_PARITY_EVEN (PCH_UART_LCR_EP)
149#define PCH_UART_HAL_PARITY_FIX1 (PCH_UART_LCR_1P)
150#define PCH_UART_HAL_PARITY_FIX0 (PCH_UART_LCR_0P)
151#define PCH_UART_HAL_5BIT (PCH_UART_LCR_5BIT)
152#define PCH_UART_HAL_6BIT (PCH_UART_LCR_6BIT)
153#define PCH_UART_HAL_7BIT (PCH_UART_LCR_7BIT)
154#define PCH_UART_HAL_8BIT (PCH_UART_LCR_8BIT)
155#define PCH_UART_HAL_STB1 0
156#define PCH_UART_HAL_STB2 (PCH_UART_LCR_STB)
157
158#define PCH_UART_HAL_CLR_TX_FIFO (PCH_UART_FCR_TFR)
159#define PCH_UART_HAL_CLR_RX_FIFO (PCH_UART_FCR_RFR)
160#define PCH_UART_HAL_CLR_ALL_FIFO (PCH_UART_HAL_CLR_TX_FIFO | \
161 PCH_UART_HAL_CLR_RX_FIFO)
162
163#define PCH_UART_HAL_DMA_MODE0 0
164#define PCH_UART_HAL_FIFO_DIS 0
165#define PCH_UART_HAL_FIFO16 (PCH_UART_FCR_FIFOE)
166#define PCH_UART_HAL_FIFO256 (PCH_UART_FCR_FIFOE | \
167 PCH_UART_FCR_FIFO256)
168#define PCH_UART_HAL_FIFO64 (PCH_UART_HAL_FIFO256)
169#define PCH_UART_HAL_TRIGGER1 (PCH_UART_FCR_RFTL1)
170#define PCH_UART_HAL_TRIGGER64 (PCH_UART_FCR_RFTL64)
171#define PCH_UART_HAL_TRIGGER128 (PCH_UART_FCR_RFTL128)
172#define PCH_UART_HAL_TRIGGER224 (PCH_UART_FCR_RFTL224)
173#define PCH_UART_HAL_TRIGGER16 (PCH_UART_FCR_RFTL16)
174#define PCH_UART_HAL_TRIGGER32 (PCH_UART_FCR_RFTL32)
175#define PCH_UART_HAL_TRIGGER56 (PCH_UART_FCR_RFTL56)
176#define PCH_UART_HAL_TRIGGER4 (PCH_UART_FCR_RFTL4)
177#define PCH_UART_HAL_TRIGGER8 (PCH_UART_FCR_RFTL8)
178#define PCH_UART_HAL_TRIGGER14 (PCH_UART_FCR_RFTL14)
179#define PCH_UART_HAL_TRIGGER_L (PCH_UART_FCR_RFTL64)
180#define PCH_UART_HAL_TRIGGER_M (PCH_UART_FCR_RFTL128)
181#define PCH_UART_HAL_TRIGGER_H (PCH_UART_FCR_RFTL224)
182
183#define PCH_UART_HAL_RX_INT (PCH_UART_IER_ERBFI)
184#define PCH_UART_HAL_TX_INT (PCH_UART_IER_ETBEI)
185#define PCH_UART_HAL_RX_ERR_INT (PCH_UART_IER_ELSI)
186#define PCH_UART_HAL_MS_INT (PCH_UART_IER_EDSSI)
187#define PCH_UART_HAL_ALL_INT (PCH_UART_IER_MASK)
188
189#define PCH_UART_HAL_DTR (PCH_UART_MCR_DTR)
190#define PCH_UART_HAL_RTS (PCH_UART_MCR_RTS)
191#define PCH_UART_HAL_OUT (PCH_UART_MCR_OUT)
192#define PCH_UART_HAL_LOOP (PCH_UART_MCR_LOOP)
193#define PCH_UART_HAL_AFE (PCH_UART_MCR_AFE)
194
195struct pch_uart_buffer {
196 unsigned char *buf;
197 int size;
198};
199
200struct eg20t_port {
201 struct uart_port port;
202 int port_type;
203 void __iomem *membase;
204 resource_size_t mapbase;
205 unsigned int iobase;
206 struct pci_dev *pdev;
207 int fifo_size;
208 int base_baud;
209 int start_tx;
210 int start_rx;
211 int tx_empty;
212 int int_dis_flag;
213 int trigger;
214 int trigger_level;
215 struct pch_uart_buffer rxbuf;
216 unsigned int dmsr;
217 unsigned int fcr;
218 unsigned int use_dma;
219 unsigned int use_dma_flag;
220 struct dma_async_tx_descriptor *desc_tx;
221 struct dma_async_tx_descriptor *desc_rx;
222 struct pch_dma_slave param_tx;
223 struct pch_dma_slave param_rx;
224 struct dma_chan *chan_tx;
225 struct dma_chan *chan_rx;
226 struct scatterlist sg_tx;
227 struct scatterlist sg_rx;
228 int tx_dma_use;
229 void *rx_buf_virt;
230 dma_addr_t rx_buf_dma;
231};
232
233static unsigned int default_baud = 9600;
234static const int trigger_level_256[4] = { 1, 64, 128, 224 };
235static const int trigger_level_64[4] = { 1, 16, 32, 56 };
236static const int trigger_level_16[4] = { 1, 4, 8, 14 };
237static const int trigger_level_1[4] = { 1, 1, 1, 1 };
238
239static void pch_uart_hal_request(struct pci_dev *pdev, int fifosize,
240 int base_baud)
241{
242 struct eg20t_port *priv = pci_get_drvdata(pdev);
243
244 priv->trigger_level = 1;
245 priv->fcr = 0;
246}
247
248static unsigned int get_msr(struct eg20t_port *priv, void __iomem *base)
249{
250 unsigned int msr = ioread8(base + UART_MSR);
251 priv->dmsr |= msr & PCH_UART_MSR_DELTA;
252
253 return msr;
254}
255
256static void pch_uart_hal_enable_interrupt(struct eg20t_port *priv,
257 unsigned int flag)
258{
259 u8 ier = ioread8(priv->membase + UART_IER);
260 ier |= flag & PCH_UART_IER_MASK;
261 iowrite8(ier, priv->membase + UART_IER);
262}
263
264static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
265 unsigned int flag)
266{
267 u8 ier = ioread8(priv->membase + UART_IER);
268 ier &= ~(flag & PCH_UART_IER_MASK);
269 iowrite8(ier, priv->membase + UART_IER);
270}
271
272static int pch_uart_hal_set_line(struct eg20t_port *priv, int baud,
273 unsigned int parity, unsigned int bits,
274 unsigned int stb)
275{
276 unsigned int dll, dlm, lcr;
277 int div;
278
279 div = DIV_ROUND(priv->base_baud / 16, baud);
280 if (div < 0 || USHRT_MAX <= div) {
281 pr_err("Invalid Baud(div=0x%x)\n", div);
282 return -EINVAL;
283 }
284
285 dll = (unsigned int)div & 0x00FFU;
286 dlm = ((unsigned int)div >> 8) & 0x00FFU;
287
288 if (parity & ~(PCH_UART_LCR_PEN | PCH_UART_LCR_EPS | PCH_UART_LCR_SP)) {
289 pr_err("Invalid parity(0x%x)\n", parity);
290 return -EINVAL;
291 }
292
293 if (bits & ~PCH_UART_LCR_WLS) {
294 pr_err("Invalid bits(0x%x)\n", bits);
295 return -EINVAL;
296 }
297
298 if (stb & ~PCH_UART_LCR_STB) {
299 pr_err("Invalid STB(0x%x)\n", stb);
300 return -EINVAL;
301 }
302
303 lcr = parity;
304 lcr |= bits;
305 lcr |= stb;
306
307 pr_debug("%s:baud = %d, div = %04x, lcr = %02x (%lu)\n",
308 __func__, baud, div, lcr, jiffies);
309 iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
310 iowrite8(dll, priv->membase + PCH_UART_DLL);
311 iowrite8(dlm, priv->membase + PCH_UART_DLM);
312 iowrite8(lcr, priv->membase + UART_LCR);
313
314 return 0;
315}
316
317static int pch_uart_hal_fifo_reset(struct eg20t_port *priv,
318 unsigned int flag)
319{
320 if (flag & ~(PCH_UART_FCR_TFR | PCH_UART_FCR_RFR)) {
321 pr_err("%s:Invalid flag(0x%x)\n", __func__, flag);
322 return -EINVAL;
323 }
324
325 iowrite8(PCH_UART_FCR_FIFOE | priv->fcr, priv->membase + UART_FCR);
326 iowrite8(PCH_UART_FCR_FIFOE | priv->fcr | flag,
327 priv->membase + UART_FCR);
328 iowrite8(priv->fcr, priv->membase + UART_FCR);
329
330 return 0;
331}
332
333static int pch_uart_hal_set_fifo(struct eg20t_port *priv,
334 unsigned int dmamode,
335 unsigned int fifo_size, unsigned int trigger)
336{
337 u8 fcr;
338
339 if (dmamode & ~PCH_UART_FCR_DMS) {
340 pr_err("%s:Invalid DMA Mode(0x%x)\n", __func__, dmamode);
341 return -EINVAL;
342 }
343
344 if (fifo_size & ~(PCH_UART_FCR_FIFOE | PCH_UART_FCR_FIFO256)) {
345 pr_err("%s:Invalid FIFO SIZE(0x%x)\n", __func__, fifo_size);
346 return -EINVAL;
347 }
348
349 if (trigger & ~PCH_UART_FCR_RFTL) {
350 pr_err("%s:Invalid TRIGGER(0x%x)\n", __func__, trigger);
351 return -EINVAL;
352 }
353
354 switch (priv->fifo_size) {
355 case 256:
356 priv->trigger_level =
357 trigger_level_256[trigger >> PCH_UART_FCR_RFTL_SHIFT];
358 break;
359 case 64:
360 priv->trigger_level =
361 trigger_level_64[trigger >> PCH_UART_FCR_RFTL_SHIFT];
362 break;
363 case 16:
364 priv->trigger_level =
365 trigger_level_16[trigger >> PCH_UART_FCR_RFTL_SHIFT];
366 break;
367 default:
368 priv->trigger_level =
369 trigger_level_1[trigger >> PCH_UART_FCR_RFTL_SHIFT];
370 break;
371 }
372 fcr =
373 dmamode | fifo_size | trigger | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR;
374 iowrite8(PCH_UART_FCR_FIFOE, priv->membase + UART_FCR);
375 iowrite8(PCH_UART_FCR_FIFOE | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR,
376 priv->membase + UART_FCR);
377 iowrite8(fcr, priv->membase + UART_FCR);
378 priv->fcr = fcr;
379
380 return 0;
381}
382
383static u8 pch_uart_hal_get_modem(struct eg20t_port *priv)
384{
385 priv->dmsr = 0;
386 return get_msr(priv, priv->membase);
387}
388
389static int pch_uart_hal_write(struct eg20t_port *priv,
390 const unsigned char *buf, int tx_size)
391{
392 int i;
393 unsigned int thr;
394
395 for (i = 0; i < tx_size;) {
396 thr = buf[i++];
397 iowrite8(thr, priv->membase + PCH_UART_THR);
398 }
399 return i;
400}
401
402static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
403 int rx_size)
404{
405 int i;
406 u8 rbr, lsr;
407
408 lsr = ioread8(priv->membase + UART_LSR);
409 for (i = 0, lsr = ioread8(priv->membase + UART_LSR);
410 i < rx_size && lsr & UART_LSR_DR;
411 lsr = ioread8(priv->membase + UART_LSR)) {
412 rbr = ioread8(priv->membase + PCH_UART_RBR);
413 buf[i++] = rbr;
414 }
415 return i;
416}
417
418static unsigned int pch_uart_hal_get_iid(struct eg20t_port *priv)
419{
420 unsigned int iir;
421 int ret;
422
423 iir = ioread8(priv->membase + UART_IIR);
424 ret = (iir & (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP));
425 return ret;
426}
427
428static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
429{
430 return ioread8(priv->membase + UART_LSR);
431}
432
433static void pch_uart_hal_set_break(struct eg20t_port *priv, int on)
434{
435 unsigned int lcr;
436
437 lcr = ioread8(priv->membase + UART_LCR);
438 if (on)
439 lcr |= PCH_UART_LCR_SB;
440 else
441 lcr &= ~PCH_UART_LCR_SB;
442
443 iowrite8(lcr, priv->membase + UART_LCR);
444}
445
446static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
447 int size)
448{
449 struct uart_port *port;
450 struct tty_struct *tty;
451
452 port = &priv->port;
453 tty = tty_port_tty_get(&port->state->port);
454 if (!tty) {
455 pr_debug("%s:tty is busy now", __func__);
456 return -EBUSY;
457 }
458
459 tty_insert_flip_string(tty, buf, size);
460 tty_flip_buffer_push(tty);
461 tty_kref_put(tty);
462
463 return 0;
464}
465
466static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf)
467{
468 int ret;
469 struct uart_port *port = &priv->port;
470
471 if (port->x_char) {
472 pr_debug("%s:X character send %02x (%lu)\n", __func__,
473 port->x_char, jiffies);
474 buf[0] = port->x_char;
475 port->x_char = 0;
476 ret = 1;
477 } else {
478 ret = 0;
479 }
480
481 return ret;
482}
483
484static int dma_push_rx(struct eg20t_port *priv, int size)
485{
486 struct tty_struct *tty;
487 int room;
488 struct uart_port *port = &priv->port;
489
490 port = &priv->port;
491 tty = tty_port_tty_get(&port->state->port);
492 if (!tty) {
493 pr_debug("%s:tty is busy now", __func__);
494 return 0;
495 }
496
497 room = tty_buffer_request_room(tty, size);
498
499 if (room < size)
500 dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
501 size - room);
502 if (!room)
503 return room;
504
505 tty_insert_flip_string(tty, sg_virt(&priv->sg_rx), size);
506
507 port->icount.rx += room;
508 tty_kref_put(tty);
509
510 return room;
511}
512
513static void pch_free_dma(struct uart_port *port)
514{
515 struct eg20t_port *priv;
516 priv = container_of(port, struct eg20t_port, port);
517
518 if (priv->chan_tx) {
519 dma_release_channel(priv->chan_tx);
520 priv->chan_tx = NULL;
521 }
522 if (priv->chan_rx) {
523 dma_release_channel(priv->chan_rx);
524 priv->chan_rx = NULL;
525 }
526 if (sg_dma_address(&priv->sg_rx))
527 dma_free_coherent(port->dev, port->fifosize,
528 sg_virt(&priv->sg_rx),
529 sg_dma_address(&priv->sg_rx));
530
531 return;
532}
533
534static bool filter(struct dma_chan *chan, void *slave)
535{
536 struct pch_dma_slave *param = slave;
537
538 if ((chan->chan_id == param->chan_id) && (param->dma_dev ==
539 chan->device->dev)) {
540 chan->private = param;
541 return true;
542 } else {
543 return false;
544 }
545}
546
547static void pch_request_dma(struct uart_port *port)
548{
549 dma_cap_mask_t mask;
550 struct dma_chan *chan;
551 struct pci_dev *dma_dev;
552 struct pch_dma_slave *param;
553 struct eg20t_port *priv =
554 container_of(port, struct eg20t_port, port);
555 dma_cap_zero(mask);
556 dma_cap_set(DMA_SLAVE, mask);
557
558 dma_dev = pci_get_bus_and_slot(2, PCI_DEVFN(0xa, 0)); /* Get DMA's dev
559 information */
560 /* Set Tx DMA */
561 param = &priv->param_tx;
562 param->dma_dev = &dma_dev->dev;
563 param->chan_id = priv->port.line;
564 param->tx_reg = port->mapbase + UART_TX;
565 chan = dma_request_channel(mask, filter, param);
566 if (!chan) {
567 pr_err("%s:dma_request_channel FAILS(Tx)\n", __func__);
568 return;
569 }
570 priv->chan_tx = chan;
571
572 /* Set Rx DMA */
573 param = &priv->param_rx;
574 param->dma_dev = &dma_dev->dev;
575 param->chan_id = priv->port.line + 1; /* Rx = Tx + 1 */
576 param->rx_reg = port->mapbase + UART_RX;
577 chan = dma_request_channel(mask, filter, param);
578 if (!chan) {
579 pr_err("%s:dma_request_channel FAILS(Rx)\n", __func__);
580 dma_release_channel(priv->chan_tx);
581 return;
582 }
583
584 /* Get Consistent memory for DMA */
585 priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize,
586 &priv->rx_buf_dma, GFP_KERNEL);
587 priv->chan_rx = chan;
588}
589
590static void pch_dma_rx_complete(void *arg)
591{
592 struct eg20t_port *priv = arg;
593 struct uart_port *port = &priv->port;
594 struct tty_struct *tty = tty_port_tty_get(&port->state->port);
595
596 if (!tty) {
597 pr_debug("%s:tty is busy now", __func__);
598 return;
599 }
600
601 if (dma_push_rx(priv, priv->trigger_level))
602 tty_flip_buffer_push(tty);
603
604 tty_kref_put(tty);
605}
606
607static void pch_dma_tx_complete(void *arg)
608{
609 struct eg20t_port *priv = arg;
610 struct uart_port *port = &priv->port;
611 struct circ_buf *xmit = &port->state->xmit;
612
613 xmit->tail += sg_dma_len(&priv->sg_tx);
614 xmit->tail &= UART_XMIT_SIZE - 1;
615 port->icount.tx += sg_dma_len(&priv->sg_tx);
616
617 async_tx_ack(priv->desc_tx);
618 priv->tx_dma_use = 0;
619}
620
621static int pop_tx(struct eg20t_port *priv, unsigned char *buf, int size)
622{
623 int count = 0;
624 struct uart_port *port = &priv->port;
625 struct circ_buf *xmit = &port->state->xmit;
626
627 if (uart_tx_stopped(port) || uart_circ_empty(xmit) || count >= size)
628 goto pop_tx_end;
629
630 do {
631 int cnt_to_end =
632 CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
633 int sz = min(size - count, cnt_to_end);
634 memcpy(&buf[count], &xmit->buf[xmit->tail], sz);
635 xmit->tail = (xmit->tail + sz) & (UART_XMIT_SIZE - 1);
636 count += sz;
637 } while (!uart_circ_empty(xmit) && count < size);
638
639pop_tx_end:
640 pr_debug("%d characters. Remained %d characters. (%lu)\n",
641 count, size - count, jiffies);
642
643 return count;
644}
645
646static int handle_rx_to(struct eg20t_port *priv)
647{
648 struct pch_uart_buffer *buf;
649 int rx_size;
650 int ret;
651 if (!priv->start_rx) {
652 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT);
653 return 0;
654 }
655 buf = &priv->rxbuf;
656 do {
657 rx_size = pch_uart_hal_read(priv, buf->buf, buf->size);
658 ret = push_rx(priv, buf->buf, rx_size);
659 if (ret)
660 return 0;
661 } while (rx_size == buf->size);
662
663 return PCH_UART_HANDLED_RX_INT;
664}
665
666static int handle_rx(struct eg20t_port *priv)
667{
668 return handle_rx_to(priv);
669}
670
671static int dma_handle_rx(struct eg20t_port *priv)
672{
673 struct uart_port *port = &priv->port;
674 struct dma_async_tx_descriptor *desc;
675 struct scatterlist *sg;
676
677 priv = container_of(port, struct eg20t_port, port);
678 sg = &priv->sg_rx;
679
680 sg_init_table(&priv->sg_rx, 1); /* Initialize SG table */
681
682 sg_dma_len(sg) = priv->fifo_size;
683
684 sg_set_page(&priv->sg_rx, virt_to_page(priv->rx_buf_virt),
685 sg_dma_len(sg), (unsigned long)priv->rx_buf_virt &
686 ~PAGE_MASK);
687
688 sg_dma_address(sg) = priv->rx_buf_dma;
689
690 desc = priv->chan_rx->device->device_prep_slave_sg(priv->chan_rx,
691 sg, 1, DMA_FROM_DEVICE,
692 DMA_PREP_INTERRUPT);
693 if (!desc)
694 return 0;
695
696 priv->desc_rx = desc;
697 desc->callback = pch_dma_rx_complete;
698 desc->callback_param = priv;
699 desc->tx_submit(desc);
700 dma_async_issue_pending(priv->chan_rx);
701
702 return PCH_UART_HANDLED_RX_INT;
703}
704
705static unsigned int handle_tx(struct eg20t_port *priv)
706{
707 struct uart_port *port = &priv->port;
708 struct circ_buf *xmit = &port->state->xmit;
709 int ret;
710 int fifo_size;
711 int tx_size;
712 int size;
713 int tx_empty;
714
715 if (!priv->start_tx) {
716 pr_info("%s:Tx isn't started. (%lu)\n", __func__, jiffies);
717 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
718 priv->tx_empty = 1;
719 return 0;
720 }
721
722 fifo_size = max(priv->fifo_size, 1);
723 tx_empty = 1;
724 if (pop_tx_x(priv, xmit->buf)) {
725 pch_uart_hal_write(priv, xmit->buf, 1);
726 port->icount.tx++;
727 tx_empty = 0;
728 fifo_size--;
729 }
730 size = min(xmit->head - xmit->tail, fifo_size);
731 tx_size = pop_tx(priv, xmit->buf, size);
732 if (tx_size > 0) {
733 ret = pch_uart_hal_write(priv, xmit->buf, tx_size);
734 port->icount.tx += ret;
735 tx_empty = 0;
736 }
737
738 priv->tx_empty = tx_empty;
739
740 if (tx_empty)
741 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
742
743 return PCH_UART_HANDLED_TX_INT;
744}
745
746static unsigned int dma_handle_tx(struct eg20t_port *priv)
747{
748 struct uart_port *port = &priv->port;
749 struct circ_buf *xmit = &port->state->xmit;
750 struct scatterlist *sg = &priv->sg_tx;
751 int nent;
752 int fifo_size;
753 int tx_empty;
754 struct dma_async_tx_descriptor *desc;
755
756 if (!priv->start_tx) {
757 pr_info("%s:Tx isn't started. (%lu)\n", __func__, jiffies);
758 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
759 priv->tx_empty = 1;
760 return 0;
761 }
762
763 fifo_size = max(priv->fifo_size, 1);
764 tx_empty = 1;
765 if (pop_tx_x(priv, xmit->buf)) {
766 pch_uart_hal_write(priv, xmit->buf, 1);
767 port->icount.tx++;
768 tx_empty = 0;
769 fifo_size--;
770 }
771
772 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
773
774 priv->tx_dma_use = 1;
775
776 sg_init_table(&priv->sg_tx, 1); /* Initialize SG table */
777
778 sg_set_page(&priv->sg_tx, virt_to_page(xmit->buf),
779 UART_XMIT_SIZE, (int)xmit->buf & ~PAGE_MASK);
780
781 nent = dma_map_sg(port->dev, &priv->sg_tx, 1, DMA_TO_DEVICE);
782 if (!nent) {
783 pr_err("%s:dma_map_sg Failed\n", __func__);
784 return 0;
785 }
786
787 sg->offset = xmit->tail & (UART_XMIT_SIZE - 1);
788 sg_dma_address(sg) = (sg_dma_address(sg) & ~(UART_XMIT_SIZE - 1)) +
789 sg->offset;
790 sg_dma_len(sg) = min((int)CIRC_CNT(xmit->head, xmit->tail,
791 UART_XMIT_SIZE), CIRC_CNT_TO_END(xmit->head,
792 xmit->tail, UART_XMIT_SIZE));
793
794 desc = priv->chan_tx->device->device_prep_slave_sg(priv->chan_tx,
795 sg, nent, DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
796 if (!desc) {
797 pr_err("%s:device_prep_slave_sg Failed\n", __func__);
798 return 0;
799 }
800
801 dma_sync_sg_for_device(port->dev, sg, 1, DMA_TO_DEVICE);
802
803 priv->desc_tx = desc;
804 desc->callback = pch_dma_tx_complete;
805 desc->callback_param = priv;
806
807 desc->tx_submit(desc);
808
809 dma_async_issue_pending(priv->chan_tx);
810
811 return PCH_UART_HANDLED_TX_INT;
812}
813
814static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
815{
816 u8 fcr = ioread8(priv->membase + UART_FCR);
817
818 /* Reset FIFO */
819 fcr |= UART_FCR_CLEAR_RCVR;
820 iowrite8(fcr, priv->membase + UART_FCR);
821
822 if (lsr & PCH_UART_LSR_ERR)
823 dev_err(&priv->pdev->dev, "Error data in FIFO\n");
824
825 if (lsr & UART_LSR_FE)
826 dev_err(&priv->pdev->dev, "Framing Error\n");
827
828 if (lsr & UART_LSR_PE)
829 dev_err(&priv->pdev->dev, "Parity Error\n");
830
831 if (lsr & UART_LSR_OE)
832 dev_err(&priv->pdev->dev, "Overrun Error\n");
833}
834
835static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
836{
837 struct eg20t_port *priv = dev_id;
838 unsigned int handled;
839 u8 lsr;
840 int ret = 0;
841 unsigned int iid;
842 unsigned long flags;
843
844 spin_lock_irqsave(&priv->port.lock, flags);
845 handled = 0;
846 while ((iid = pch_uart_hal_get_iid(priv)) > 1) {
847 switch (iid) {
848 case PCH_UART_IID_RLS: /* Receiver Line Status */
849 lsr = pch_uart_hal_get_line_status(priv);
850 if (lsr & (PCH_UART_LSR_ERR | UART_LSR_FE |
851 UART_LSR_PE | UART_LSR_OE)) {
852 pch_uart_err_ir(priv, lsr);
853 ret = PCH_UART_HANDLED_RX_ERR_INT;
854 }
855 break;
856 case PCH_UART_IID_RDR: /* Received Data Ready */
857 if (priv->use_dma)
858 ret = dma_handle_rx(priv);
859 else
860 ret = handle_rx(priv);
861 break;
862 case PCH_UART_IID_RDR_TO: /* Received Data Ready
863 (FIFO Timeout) */
864 ret = handle_rx_to(priv);
865 break;
866 case PCH_UART_IID_THRE: /* Transmitter Holding Register
867 Empty */
868 if (priv->use_dma)
869 ret = dma_handle_tx(priv);
870 else
871 ret = handle_tx(priv);
872 break;
873 case PCH_UART_IID_MS: /* Modem Status */
874 ret = PCH_UART_HANDLED_MS_INT;
875 break;
876 default: /* Never junp to this label */
877 pr_err("%s:iid=%d (%lu)\n", __func__, iid, jiffies);
878 ret = -1;
879 break;
880 }
881 handled |= (unsigned int)ret;
882 }
883 if (handled == 0 && iid <= 1) {
884 if (priv->int_dis_flag)
885 priv->int_dis_flag = 0;
886 }
887
888 spin_unlock_irqrestore(&priv->port.lock, flags);
889 return IRQ_RETVAL(handled);
890}
891
892/* This function tests whether the transmitter fifo and shifter for the port
893 described by 'port' is empty. */
894static unsigned int pch_uart_tx_empty(struct uart_port *port)
895{
896 struct eg20t_port *priv;
897 int ret;
898 priv = container_of(port, struct eg20t_port, port);
899 if (priv->tx_empty)
900 ret = TIOCSER_TEMT;
901 else
902 ret = 0;
903
904 return ret;
905}
906
907/* Returns the current state of modem control inputs. */
908static unsigned int pch_uart_get_mctrl(struct uart_port *port)
909{
910 struct eg20t_port *priv;
911 u8 modem;
912 unsigned int ret = 0;
913
914 priv = container_of(port, struct eg20t_port, port);
915 modem = pch_uart_hal_get_modem(priv);
916
917 if (modem & UART_MSR_DCD)
918 ret |= TIOCM_CAR;
919
920 if (modem & UART_MSR_RI)
921 ret |= TIOCM_RNG;
922
923 if (modem & UART_MSR_DSR)
924 ret |= TIOCM_DSR;
925
926 if (modem & UART_MSR_CTS)
927 ret |= TIOCM_CTS;
928
929 return ret;
930}
931
932static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
933{
934 u32 mcr = 0;
935 unsigned int dat;
936 struct eg20t_port *priv = container_of(port, struct eg20t_port, port);
937
938 if (mctrl & TIOCM_DTR)
939 mcr |= UART_MCR_DTR;
940 if (mctrl & TIOCM_RTS)
941 mcr |= UART_MCR_RTS;
942 if (mctrl & TIOCM_LOOP)
943 mcr |= UART_MCR_LOOP;
944
945 if (mctrl) {
946 dat = pch_uart_get_mctrl(port);
947 dat |= mcr;
948 iowrite8(dat, priv->membase + UART_MCR);
949 }
950}
951
952static void pch_uart_stop_tx(struct uart_port *port)
953{
954 struct eg20t_port *priv;
955 priv = container_of(port, struct eg20t_port, port);
956 priv->start_tx = 0;
957 priv->tx_dma_use = 0;
958}
959
960static void pch_uart_start_tx(struct uart_port *port)
961{
962 struct eg20t_port *priv;
963
964 priv = container_of(port, struct eg20t_port, port);
965
966 if (priv->use_dma)
967 if (priv->tx_dma_use)
968 return;
969
970 priv->start_tx = 1;
971 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
972}
973
974static void pch_uart_stop_rx(struct uart_port *port)
975{
976 struct eg20t_port *priv;
977 priv = container_of(port, struct eg20t_port, port);
978 priv->start_rx = 0;
979 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT);
980 priv->int_dis_flag = 1;
981}
982
983/* Enable the modem status interrupts. */
984static void pch_uart_enable_ms(struct uart_port *port)
985{
986 struct eg20t_port *priv;
987 priv = container_of(port, struct eg20t_port, port);
988 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_MS_INT);
989}
990
991/* Control the transmission of a break signal. */
992static void pch_uart_break_ctl(struct uart_port *port, int ctl)
993{
994 struct eg20t_port *priv;
995 unsigned long flags;
996
997 priv = container_of(port, struct eg20t_port, port);
998 spin_lock_irqsave(&port->lock, flags);
999 pch_uart_hal_set_break(priv, ctl);
1000 spin_unlock_irqrestore(&port->lock, flags);
1001}
1002
1003/* Grab any interrupt resources and initialise any low level driver state. */
1004static int pch_uart_startup(struct uart_port *port)
1005{
1006 struct eg20t_port *priv;
1007 int ret;
1008 int fifo_size;
1009 int trigger_level;
1010
1011 priv = container_of(port, struct eg20t_port, port);
1012 priv->tx_empty = 1;
1013 port->uartclk = priv->base_baud;
1014 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1015 ret = pch_uart_hal_set_line(priv, default_baud,
1016 PCH_UART_HAL_PARITY_NONE, PCH_UART_HAL_8BIT,
1017 PCH_UART_HAL_STB1);
1018 if (ret)
1019 return ret;
1020
1021 switch (priv->fifo_size) {
1022 case 256:
1023 fifo_size = PCH_UART_HAL_FIFO256;
1024 break;
1025 case 64:
1026 fifo_size = PCH_UART_HAL_FIFO64;
1027 break;
1028 case 16:
1029 fifo_size = PCH_UART_HAL_FIFO16;
1030 case 1:
1031 default:
1032 fifo_size = PCH_UART_HAL_FIFO_DIS;
1033 break;
1034 }
1035
1036 switch (priv->trigger) {
1037 case PCH_UART_HAL_TRIGGER1:
1038 trigger_level = 1;
1039 break;
1040 case PCH_UART_HAL_TRIGGER_L:
1041 trigger_level = priv->fifo_size / 4;
1042 break;
1043 case PCH_UART_HAL_TRIGGER_M:
1044 trigger_level = priv->fifo_size / 2;
1045 break;
1046 case PCH_UART_HAL_TRIGGER_H:
1047 default:
1048 trigger_level = priv->fifo_size - (priv->fifo_size / 8);
1049 break;
1050 }
1051
1052 priv->trigger_level = trigger_level;
1053 ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1054 fifo_size, priv->trigger);
1055 if (ret < 0)
1056 return ret;
1057
1058 ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
1059 KBUILD_MODNAME, priv);
1060 if (ret < 0)
1061 return ret;
1062
1063 if (priv->use_dma)
1064 pch_request_dma(port);
1065
1066 priv->start_rx = 1;
1067 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT);
1068 uart_update_timeout(port, CS8, default_baud);
1069
1070 return 0;
1071}
1072
1073static void pch_uart_shutdown(struct uart_port *port)
1074{
1075 struct eg20t_port *priv;
1076 int ret;
1077
1078 priv = container_of(port, struct eg20t_port, port);
1079 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1080 pch_uart_hal_fifo_reset(priv, PCH_UART_HAL_CLR_ALL_FIFO);
1081 ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1082 PCH_UART_HAL_FIFO_DIS, PCH_UART_HAL_TRIGGER1);
1083 if (ret)
1084 pr_err("pch_uart_hal_set_fifo Failed(ret=%d)\n", ret);
1085
1086 if (priv->use_dma_flag)
1087 pch_free_dma(port);
1088
1089 free_irq(priv->port.irq, priv);
1090}
1091
1092/* Change the port parameters, including word length, parity, stop
1093 *bits. Update read_status_mask and ignore_status_mask to indicate
1094 *the types of events we are interested in receiving. */
1095static void pch_uart_set_termios(struct uart_port *port,
1096 struct ktermios *termios, struct ktermios *old)
1097{
1098 int baud;
1099 int rtn;
1100 unsigned int parity, bits, stb;
1101 struct eg20t_port *priv;
1102 unsigned long flags;
1103
1104 priv = container_of(port, struct eg20t_port, port);
1105 switch (termios->c_cflag & CSIZE) {
1106 case CS5:
1107 bits = PCH_UART_HAL_5BIT;
1108 break;
1109 case CS6:
1110 bits = PCH_UART_HAL_6BIT;
1111 break;
1112 case CS7:
1113 bits = PCH_UART_HAL_7BIT;
1114 break;
1115 default: /* CS8 */
1116 bits = PCH_UART_HAL_8BIT;
1117 break;
1118 }
1119 if (termios->c_cflag & CSTOPB)
1120 stb = PCH_UART_HAL_STB2;
1121 else
1122 stb = PCH_UART_HAL_STB1;
1123
1124 if (termios->c_cflag & PARENB) {
1125 if (!(termios->c_cflag & PARODD))
1126 parity = PCH_UART_HAL_PARITY_ODD;
1127 else
1128 parity = PCH_UART_HAL_PARITY_EVEN;
1129
1130 } else {
1131 parity = PCH_UART_HAL_PARITY_NONE;
1132 }
1133 termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
1134
1135 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
1136
1137 spin_lock_irqsave(&port->lock, flags);
1138
1139 uart_update_timeout(port, termios->c_cflag, baud);
1140 rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb);
1141 if (rtn)
1142 goto out;
1143
1144 /* Don't rewrite B0 */
1145 if (tty_termios_baud_rate(termios))
1146 tty_termios_encode_baud_rate(termios, baud, baud);
1147
1148out:
1149 spin_unlock_irqrestore(&port->lock, flags);
1150}
1151
1152static const char *pch_uart_type(struct uart_port *port)
1153{
1154 return KBUILD_MODNAME;
1155}
1156
1157static void pch_uart_release_port(struct uart_port *port)
1158{
1159 struct eg20t_port *priv;
1160
1161 priv = container_of(port, struct eg20t_port, port);
1162 pci_iounmap(priv->pdev, priv->membase);
1163 pci_release_regions(priv->pdev);
1164}
1165
1166static int pch_uart_request_port(struct uart_port *port)
1167{
1168 struct eg20t_port *priv;
1169 int ret;
1170 void __iomem *membase;
1171
1172 priv = container_of(port, struct eg20t_port, port);
1173 ret = pci_request_regions(priv->pdev, KBUILD_MODNAME);
1174 if (ret < 0)
1175 return -EBUSY;
1176
1177 membase = pci_iomap(priv->pdev, 1, 0);
1178 if (!membase) {
1179 pci_release_regions(priv->pdev);
1180 return -EBUSY;
1181 }
1182 priv->membase = port->membase = membase;
1183
1184 return 0;
1185}
1186
1187static void pch_uart_config_port(struct uart_port *port, int type)
1188{
1189 struct eg20t_port *priv;
1190
1191 priv = container_of(port, struct eg20t_port, port);
1192 if (type & UART_CONFIG_TYPE) {
1193 port->type = priv->port_type;
1194 pch_uart_request_port(port);
1195 }
1196}
1197
1198static int pch_uart_verify_port(struct uart_port *port,
1199 struct serial_struct *serinfo)
1200{
1201 struct eg20t_port *priv;
1202
1203 priv = container_of(port, struct eg20t_port, port);
1204 if (serinfo->flags & UPF_LOW_LATENCY) {
1205 pr_info("PCH UART : Use PIO Mode (without DMA)\n");
1206 priv->use_dma = 0;
1207 serinfo->flags &= ~UPF_LOW_LATENCY;
1208 } else {
1209#ifndef CONFIG_PCH_DMA
1210 pr_err("%s : PCH DMA is not Loaded.\n", __func__);
1211 return -EOPNOTSUPP;
1212#endif
1213 priv->use_dma = 1;
1214 priv->use_dma_flag = 1;
1215 pr_info("PCH UART : Use DMA Mode\n");
1216 }
1217
1218 return 0;
1219}
1220
1221static struct uart_ops pch_uart_ops = {
1222 .tx_empty = pch_uart_tx_empty,
1223 .set_mctrl = pch_uart_set_mctrl,
1224 .get_mctrl = pch_uart_get_mctrl,
1225 .stop_tx = pch_uart_stop_tx,
1226 .start_tx = pch_uart_start_tx,
1227 .stop_rx = pch_uart_stop_rx,
1228 .enable_ms = pch_uart_enable_ms,
1229 .break_ctl = pch_uart_break_ctl,
1230 .startup = pch_uart_startup,
1231 .shutdown = pch_uart_shutdown,
1232 .set_termios = pch_uart_set_termios,
1233/* .pm = pch_uart_pm, Not supported yet */
1234/* .set_wake = pch_uart_set_wake, Not supported yet */
1235 .type = pch_uart_type,
1236 .release_port = pch_uart_release_port,
1237 .request_port = pch_uart_request_port,
1238 .config_port = pch_uart_config_port,
1239 .verify_port = pch_uart_verify_port
1240};
1241
1242static struct uart_driver pch_uart_driver = {
1243 .owner = THIS_MODULE,
1244 .driver_name = KBUILD_MODNAME,
1245 .dev_name = PCH_UART_DRIVER_DEVICE,
1246 .major = 0,
1247 .minor = 0,
1248 .nr = PCH_UART_NR,
1249};
1250
1251static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
1252 int port_type)
1253{
1254 struct eg20t_port *priv;
1255 int ret;
1256 unsigned int iobase;
1257 unsigned int mapbase;
1258 unsigned char *rxbuf;
1259 int fifosize, base_baud;
1260 static int num;
1261
1262 priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
1263 if (priv == NULL)
1264 goto init_port_alloc_err;
1265
1266 rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1267 if (!rxbuf)
1268 goto init_port_free_txbuf;
1269
1270 switch (port_type) {
1271 case PORT_UNKNOWN:
1272 fifosize = 256; /* UART0 */
1273 base_baud = 1843200; /* 1.8432MHz */
1274 break;
1275 case PORT_8250:
1276 fifosize = 64; /* UART1~3 */
1277 base_baud = 1843200; /* 1.8432MHz */
1278 break;
1279 default:
1280 dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type);
1281 goto init_port_hal_free;
1282 }
1283
1284 iobase = pci_resource_start(pdev, 0);
1285 mapbase = pci_resource_start(pdev, 1);
1286 priv->mapbase = mapbase;
1287 priv->iobase = iobase;
1288 priv->pdev = pdev;
1289 priv->tx_empty = 1;
1290 priv->rxbuf.buf = rxbuf;
1291 priv->rxbuf.size = PAGE_SIZE;
1292
1293 priv->fifo_size = fifosize;
1294 priv->base_baud = base_baud;
1295 priv->port_type = PORT_MAX_8250 + port_type + 1;
1296 priv->port.dev = &pdev->dev;
1297 priv->port.iobase = iobase;
1298 priv->port.membase = NULL;
1299 priv->port.mapbase = mapbase;
1300 priv->port.irq = pdev->irq;
1301 priv->port.iotype = UPIO_PORT;
1302 priv->port.ops = &pch_uart_ops;
1303 priv->port.flags = UPF_BOOT_AUTOCONF;
1304 priv->port.fifosize = fifosize;
1305 priv->port.line = num++;
1306 priv->trigger = PCH_UART_HAL_TRIGGER_M;
1307
1308 pci_set_drvdata(pdev, priv);
1309 pch_uart_hal_request(pdev, fifosize, base_baud);
1310 ret = uart_add_one_port(&pch_uart_driver, &priv->port);
1311 if (ret < 0)
1312 goto init_port_hal_free;
1313
1314 return priv;
1315
1316init_port_hal_free:
1317 free_page((unsigned long)rxbuf);
1318init_port_free_txbuf:
1319 kfree(priv);
1320init_port_alloc_err:
1321
1322 return NULL;
1323}
1324
1325static void pch_uart_exit_port(struct eg20t_port *priv)
1326{
1327 uart_remove_one_port(&pch_uart_driver, &priv->port);
1328 pci_set_drvdata(priv->pdev, NULL);
1329 free_page((unsigned long)priv->rxbuf.buf);
1330}
1331
1332static void pch_uart_pci_remove(struct pci_dev *pdev)
1333{
1334 struct eg20t_port *priv;
1335
1336 priv = (struct eg20t_port *)pci_get_drvdata(pdev);
1337 pch_uart_exit_port(priv);
1338 pci_disable_device(pdev);
1339 kfree(priv);
1340 return;
1341}
1342#ifdef CONFIG_PM
1343static int pch_uart_pci_suspend(struct pci_dev *pdev, pm_message_t state)
1344{
1345 struct eg20t_port *priv = pci_get_drvdata(pdev);
1346
1347 uart_suspend_port(&pch_uart_driver, &priv->port);
1348
1349 pci_save_state(pdev);
1350 pci_set_power_state(pdev, pci_choose_state(pdev, state));
1351 return 0;
1352}
1353
1354static int pch_uart_pci_resume(struct pci_dev *pdev)
1355{
1356 struct eg20t_port *priv = pci_get_drvdata(pdev);
1357 int ret;
1358
1359 pci_set_power_state(pdev, PCI_D0);
1360 pci_restore_state(pdev);
1361
1362 ret = pci_enable_device(pdev);
1363 if (ret) {
1364 dev_err(&pdev->dev,
1365 "%s-pci_enable_device failed(ret=%d) ", __func__, ret);
1366 return ret;
1367 }
1368
1369 uart_resume_port(&pch_uart_driver, &priv->port);
1370
1371 return 0;
1372}
1373#else
1374#define pch_uart_pci_suspend NULL
1375#define pch_uart_pci_resume NULL
1376#endif
1377
1378static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = {
1379 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
1380 .driver_data = PCH_UART_8LINE},
1381 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
1382 .driver_data = PCH_UART_2LINE},
1383 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813),
1384 .driver_data = PCH_UART_2LINE},
1385 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
1386 .driver_data = PCH_UART_2LINE},
1387 {0,},
1388};
1389
1390static int __devinit pch_uart_pci_probe(struct pci_dev *pdev,
1391 const struct pci_device_id *id)
1392{
1393 int ret;
1394 struct eg20t_port *priv;
1395
1396 ret = pci_enable_device(pdev);
1397 if (ret < 0)
1398 goto probe_error;
1399
1400 priv = pch_uart_init_port(pdev, id->driver_data);
1401 if (!priv) {
1402 ret = -EBUSY;
1403 goto probe_disable_device;
1404 }
1405 pci_set_drvdata(pdev, priv);
1406
1407 return ret;
1408
1409probe_disable_device:
1410 pci_disable_device(pdev);
1411probe_error:
1412 return ret;
1413}
1414
1415static struct pci_driver pch_uart_pci_driver = {
1416 .name = "pch_uart",
1417 .id_table = pch_uart_pci_id,
1418 .probe = pch_uart_pci_probe,
1419 .remove = __devexit_p(pch_uart_pci_remove),
1420 .suspend = pch_uart_pci_suspend,
1421 .resume = pch_uart_pci_resume,
1422};
1423
1424static int __init pch_uart_module_init(void)
1425{
1426 int ret;
1427
1428 /* register as UART driver */
1429 ret = uart_register_driver(&pch_uart_driver);
1430 if (ret < 0)
1431 return ret;
1432
1433 /* register as PCI driver */
1434 ret = pci_register_driver(&pch_uart_pci_driver);
1435 if (ret < 0)
1436 uart_unregister_driver(&pch_uart_driver);
1437
1438 return ret;
1439}
1440module_init(pch_uart_module_init);
1441
1442static void __exit pch_uart_module_exit(void)
1443{
1444 pci_unregister_driver(&pch_uart_pci_driver);
1445 uart_unregister_driver(&pch_uart_driver);
1446}
1447module_exit(pch_uart_module_exit);
1448
1449MODULE_LICENSE("GPL v2");
1450MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
1451module_param(default_baud, uint, S_IRUGO);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-27 13:00:57 -0500