include: replace linux/module.h with "struct module" wherever possible
[linux-2.6/next.git] / drivers / tty / serial / pch_uart.c
blob846dfcd3ce0d28a6ee882278a90779c3c6427e21
1 /*
2 *Copyright (C) 2010 OKI SEMICONDUCTOR CO., LTD.
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.
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.
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.
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/interrupt.h>
24 #include <linux/io.h>
25 #include <linux/dmi.h>
27 #include <linux/dmaengine.h>
28 #include <linux/pch_dma.h>
30 enum {
31 PCH_UART_HANDLED_RX_INT_SHIFT,
32 PCH_UART_HANDLED_TX_INT_SHIFT,
33 PCH_UART_HANDLED_RX_ERR_INT_SHIFT,
34 PCH_UART_HANDLED_RX_TRG_INT_SHIFT,
35 PCH_UART_HANDLED_MS_INT_SHIFT,
38 enum {
39 PCH_UART_8LINE,
40 PCH_UART_2LINE,
43 #define PCH_UART_DRIVER_DEVICE "ttyPCH"
45 /* Set the max number of UART port
46 * Intel EG20T PCH: 4 port
47 * OKI SEMICONDUCTOR ML7213 IOH: 3 port
48 * OKI SEMICONDUCTOR ML7223 IOH: 2 port
50 #define PCH_UART_NR 4
52 #define PCH_UART_HANDLED_RX_INT (1<<((PCH_UART_HANDLED_RX_INT_SHIFT)<<1))
53 #define PCH_UART_HANDLED_TX_INT (1<<((PCH_UART_HANDLED_TX_INT_SHIFT)<<1))
54 #define PCH_UART_HANDLED_RX_ERR_INT (1<<((\
55 PCH_UART_HANDLED_RX_ERR_INT_SHIFT)<<1))
56 #define PCH_UART_HANDLED_RX_TRG_INT (1<<((\
57 PCH_UART_HANDLED_RX_TRG_INT_SHIFT)<<1))
58 #define PCH_UART_HANDLED_MS_INT (1<<((PCH_UART_HANDLED_MS_INT_SHIFT)<<1))
60 #define PCH_UART_RBR 0x00
61 #define PCH_UART_THR 0x00
63 #define PCH_UART_IER_MASK (PCH_UART_IER_ERBFI|PCH_UART_IER_ETBEI|\
64 PCH_UART_IER_ELSI|PCH_UART_IER_EDSSI)
65 #define PCH_UART_IER_ERBFI 0x00000001
66 #define PCH_UART_IER_ETBEI 0x00000002
67 #define PCH_UART_IER_ELSI 0x00000004
68 #define PCH_UART_IER_EDSSI 0x00000008
70 #define PCH_UART_IIR_IP 0x00000001
71 #define PCH_UART_IIR_IID 0x00000006
72 #define PCH_UART_IIR_MSI 0x00000000
73 #define PCH_UART_IIR_TRI 0x00000002
74 #define PCH_UART_IIR_RRI 0x00000004
75 #define PCH_UART_IIR_REI 0x00000006
76 #define PCH_UART_IIR_TOI 0x00000008
77 #define PCH_UART_IIR_FIFO256 0x00000020
78 #define PCH_UART_IIR_FIFO64 PCH_UART_IIR_FIFO256
79 #define PCH_UART_IIR_FE 0x000000C0
81 #define PCH_UART_FCR_FIFOE 0x00000001
82 #define PCH_UART_FCR_RFR 0x00000002
83 #define PCH_UART_FCR_TFR 0x00000004
84 #define PCH_UART_FCR_DMS 0x00000008
85 #define PCH_UART_FCR_FIFO256 0x00000020
86 #define PCH_UART_FCR_RFTL 0x000000C0
88 #define PCH_UART_FCR_RFTL1 0x00000000
89 #define PCH_UART_FCR_RFTL64 0x00000040
90 #define PCH_UART_FCR_RFTL128 0x00000080
91 #define PCH_UART_FCR_RFTL224 0x000000C0
92 #define PCH_UART_FCR_RFTL16 PCH_UART_FCR_RFTL64
93 #define PCH_UART_FCR_RFTL32 PCH_UART_FCR_RFTL128
94 #define PCH_UART_FCR_RFTL56 PCH_UART_FCR_RFTL224
95 #define PCH_UART_FCR_RFTL4 PCH_UART_FCR_RFTL64
96 #define PCH_UART_FCR_RFTL8 PCH_UART_FCR_RFTL128
97 #define PCH_UART_FCR_RFTL14 PCH_UART_FCR_RFTL224
98 #define PCH_UART_FCR_RFTL_SHIFT 6
100 #define PCH_UART_LCR_WLS 0x00000003
101 #define PCH_UART_LCR_STB 0x00000004
102 #define PCH_UART_LCR_PEN 0x00000008
103 #define PCH_UART_LCR_EPS 0x00000010
104 #define PCH_UART_LCR_SP 0x00000020
105 #define PCH_UART_LCR_SB 0x00000040
106 #define PCH_UART_LCR_DLAB 0x00000080
107 #define PCH_UART_LCR_NP 0x00000000
108 #define PCH_UART_LCR_OP PCH_UART_LCR_PEN
109 #define PCH_UART_LCR_EP (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS)
110 #define PCH_UART_LCR_1P (PCH_UART_LCR_PEN | PCH_UART_LCR_SP)
111 #define PCH_UART_LCR_0P (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS |\
112 PCH_UART_LCR_SP)
114 #define PCH_UART_LCR_5BIT 0x00000000
115 #define PCH_UART_LCR_6BIT 0x00000001
116 #define PCH_UART_LCR_7BIT 0x00000002
117 #define PCH_UART_LCR_8BIT 0x00000003
119 #define PCH_UART_MCR_DTR 0x00000001
120 #define PCH_UART_MCR_RTS 0x00000002
121 #define PCH_UART_MCR_OUT 0x0000000C
122 #define PCH_UART_MCR_LOOP 0x00000010
123 #define PCH_UART_MCR_AFE 0x00000020
125 #define PCH_UART_LSR_DR 0x00000001
126 #define PCH_UART_LSR_ERR (1<<7)
128 #define PCH_UART_MSR_DCTS 0x00000001
129 #define PCH_UART_MSR_DDSR 0x00000002
130 #define PCH_UART_MSR_TERI 0x00000004
131 #define PCH_UART_MSR_DDCD 0x00000008
132 #define PCH_UART_MSR_CTS 0x00000010
133 #define PCH_UART_MSR_DSR 0x00000020
134 #define PCH_UART_MSR_RI 0x00000040
135 #define PCH_UART_MSR_DCD 0x00000080
136 #define PCH_UART_MSR_DELTA (PCH_UART_MSR_DCTS | PCH_UART_MSR_DDSR |\
137 PCH_UART_MSR_TERI | PCH_UART_MSR_DDCD)
139 #define PCH_UART_DLL 0x00
140 #define PCH_UART_DLM 0x01
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)
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)
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)
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)
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)
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)
197 #define PCI_VENDOR_ID_ROHM 0x10DB
199 struct pch_uart_buffer {
200 unsigned char *buf;
201 int size;
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;
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...)
244 struct pch_uart_driver_data {
245 int port_type;
246 int line_no;
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,
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},
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 };
279 static void pch_uart_hal_request(struct pci_dev *pdev, int fifosize,
280 int base_baud)
282 struct eg20t_port *priv = pci_get_drvdata(pdev);
284 priv->trigger_level = 1;
285 priv->fcr = 0;
288 static unsigned int get_msr(struct eg20t_port *priv, void __iomem *base)
290 unsigned int msr = ioread8(base + UART_MSR);
291 priv->dmsr |= msr & PCH_UART_MSR_DELTA;
293 return msr;
296 static void pch_uart_hal_enable_interrupt(struct eg20t_port *priv,
297 unsigned int flag)
299 u8 ier = ioread8(priv->membase + UART_IER);
300 ier |= flag & PCH_UART_IER_MASK;
301 iowrite8(ier, priv->membase + UART_IER);
304 static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
305 unsigned int flag)
307 u8 ier = ioread8(priv->membase + UART_IER);
308 ier &= ~(flag & PCH_UART_IER_MASK);
309 iowrite8(ier, priv->membase + UART_IER);
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)
316 unsigned int dll, dlm, lcr;
317 int div;
319 div = DIV_ROUND_CLOSEST(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;
325 dll = (unsigned int)div & 0x00FFU;
326 dlm = ((unsigned int)div >> 8) & 0x00FFU;
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;
333 if (bits & ~PCH_UART_LCR_WLS) {
334 dev_err(priv->port.dev, "Invalid bits(0x%x)\n", bits);
335 return -EINVAL;
338 if (stb & ~PCH_UART_LCR_STB) {
339 dev_err(priv->port.dev, "Invalid STB(0x%x)\n", stb);
340 return -EINVAL;
343 lcr = parity;
344 lcr |= bits;
345 lcr |= stb;
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);
354 return 0;
357 static int pch_uart_hal_fifo_reset(struct eg20t_port *priv,
358 unsigned int flag)
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;
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);
371 return 0;
374 static int pch_uart_hal_set_fifo(struct eg20t_port *priv,
375 unsigned int dmamode,
376 unsigned int fifo_size, unsigned int trigger)
378 u8 fcr;
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;
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;
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;
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;
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;
424 return 0;
427 static u8 pch_uart_hal_get_modem(struct eg20t_port *priv)
429 priv->dmsr = 0;
430 return get_msr(priv, priv->membase);
433 static void pch_uart_hal_write(struct eg20t_port *priv,
434 const unsigned char *buf, int tx_size)
436 int i;
437 unsigned int thr;
439 for (i = 0; i < tx_size;) {
440 thr = buf[i++];
441 iowrite8(thr, priv->membase + PCH_UART_THR);
445 static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
446 int rx_size)
448 int i;
449 u8 rbr, lsr;
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;
458 return i;
461 static unsigned int pch_uart_hal_get_iid(struct eg20t_port *priv)
463 unsigned int iir;
464 int ret;
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;
471 static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
473 return ioread8(priv->membase + UART_LSR);
476 static void pch_uart_hal_set_break(struct eg20t_port *priv, int on)
478 unsigned int lcr;
480 lcr = ioread8(priv->membase + UART_LCR);
481 if (on)
482 lcr |= PCH_UART_LCR_SB;
483 else
484 lcr &= ~PCH_UART_LCR_SB;
486 iowrite8(lcr, priv->membase + UART_LCR);
489 static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
490 int size)
492 struct uart_port *port;
493 struct tty_struct *tty;
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;
502 tty_insert_flip_string(tty, buf, size);
503 tty_flip_buffer_push(tty);
504 tty_kref_put(tty);
506 return 0;
509 static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf)
511 int ret;
512 struct uart_port *port = &priv->port;
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;
524 return ret;
527 static int dma_push_rx(struct eg20t_port *priv, int size)
529 struct tty_struct *tty;
530 int room;
531 struct uart_port *port = &priv->port;
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;
540 room = tty_buffer_request_room(tty, size);
542 if (room < size)
543 dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
544 size - room);
545 if (!room)
546 return room;
548 tty_insert_flip_string(tty, sg_virt(&priv->sg_rx), size);
550 port->icount.rx += room;
551 tty_kref_put(tty);
553 return room;
556 static void pch_free_dma(struct uart_port *port)
558 struct eg20t_port *priv;
559 priv = container_of(port, struct eg20t_port, port);
561 if (priv->chan_tx) {
562 dma_release_channel(priv->chan_tx);
563 priv->chan_tx = NULL;
565 if (priv->chan_rx) {
566 dma_release_channel(priv->chan_rx);
567 priv->chan_rx = NULL;
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));
574 return;
577 static bool filter(struct dma_chan *chan, void *slave)
579 struct pch_dma_slave *param = slave;
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;
590 static void pch_request_dma(struct uart_port *port)
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);
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, ... */
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;
615 priv->chan_tx = chan;
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 */
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;
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;
637 static void pch_dma_rx_complete(void *arg)
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;
644 if (!tty) {
645 dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
646 return;
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);
658 static void pch_dma_tx_complete(void *arg)
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;
666 for (i = 0; i < priv->nent; i++, sg++) {
667 xmit->tail += sg_dma_len(sg);
668 port->icount.tx += sg_dma_len(sg);
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);
679 static int pop_tx(struct eg20t_port *priv, int size)
681 int count = 0;
682 struct uart_port *port = &priv->port;
683 struct circ_buf *xmit = &port->state->xmit;
685 if (uart_tx_stopped(port) || uart_circ_empty(xmit) || count >= size)
686 goto pop_tx_end;
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);
697 pop_tx_end:
698 dev_dbg(priv->port.dev, "%d characters. Remained %d characters.(%lu)\n",
699 count, size - count, jiffies);
701 return count;
704 static int handle_rx_to(struct eg20t_port *priv)
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;
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);
721 return PCH_UART_HANDLED_RX_INT;
724 static int handle_rx(struct eg20t_port *priv)
726 return handle_rx_to(priv);
729 static int dma_handle_rx(struct eg20t_port *priv)
731 struct uart_port *port = &priv->port;
732 struct dma_async_tx_descriptor *desc;
733 struct scatterlist *sg;
735 priv = container_of(port, struct eg20t_port, port);
736 sg = &priv->sg_rx;
738 sg_init_table(&priv->sg_rx, 1); /* Initialize SG table */
740 sg_dma_len(sg) = priv->trigger_level;
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);
746 sg_dma_address(sg) = priv->rx_buf_dma;
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);
752 if (!desc)
753 return 0;
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);
761 return PCH_UART_HANDLED_RX_INT;
764 static unsigned int handle_tx(struct eg20t_port *priv)
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;
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;
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--;
789 size = min(xmit->head - xmit->tail, fifo_size);
790 if (size < 0)
791 size = fifo_size;
793 tx_size = pop_tx(priv, size);
794 if (tx_size > 0) {
795 port->icount.tx += tx_size;
796 tx_empty = 0;
799 priv->tx_empty = tx_empty;
801 if (tx_empty) {
802 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
803 uart_write_wakeup(port);
806 return PCH_UART_HANDLED_TX_INT;
809 static unsigned int dma_handle_tx(struct eg20t_port *priv)
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;
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;
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;
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--;
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;
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;
869 dev_dbg(priv->port.dev, "%s num=%d size=%d rem=%d\n",
870 __func__, num, size, rem);
872 priv->tx_dma_use = 1;
874 priv->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
876 sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
877 sg = priv->sg_tx_p;
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);
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;
894 priv->nent = nent;
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;
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;
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;
920 desc->tx_submit(desc);
922 dma_async_issue_pending(priv->chan_tx);
924 return PCH_UART_HANDLED_TX_INT;
927 static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
929 u8 fcr = ioread8(priv->membase + UART_FCR);
931 /* Reset FIFO */
932 fcr |= UART_FCR_CLEAR_RCVR;
933 iowrite8(fcr, priv->membase + UART_FCR);
935 if (lsr & PCH_UART_LSR_ERR)
936 dev_err(&priv->pdev->dev, "Error data in FIFO\n");
938 if (lsr & UART_LSR_FE)
939 dev_err(&priv->pdev->dev, "Framing Error\n");
941 if (lsr & UART_LSR_PE)
942 dev_err(&priv->pdev->dev, "Parity Error\n");
944 if (lsr & UART_LSR_OE)
945 dev_err(&priv->pdev->dev, "Overrun Error\n");
948 static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
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;
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;
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);
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;
1001 handled |= (unsigned int)ret;
1003 if (handled == 0 && iid <= 1) {
1004 if (priv->int_dis_flag)
1005 priv->int_dis_flag = 0;
1008 spin_unlock_irqrestore(&priv->port.lock, flags);
1009 return IRQ_RETVAL(handled);
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)
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;
1024 return ret;
1027 /* Returns the current state of modem control inputs. */
1028 static unsigned int pch_uart_get_mctrl(struct uart_port *port)
1030 struct eg20t_port *priv;
1031 u8 modem;
1032 unsigned int ret = 0;
1034 priv = container_of(port, struct eg20t_port, port);
1035 modem = pch_uart_hal_get_modem(priv);
1037 if (modem & UART_MSR_DCD)
1038 ret |= TIOCM_CAR;
1040 if (modem & UART_MSR_RI)
1041 ret |= TIOCM_RNG;
1043 if (modem & UART_MSR_DSR)
1044 ret |= TIOCM_DSR;
1046 if (modem & UART_MSR_CTS)
1047 ret |= TIOCM_CTS;
1049 return ret;
1052 static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
1054 u32 mcr = 0;
1055 struct eg20t_port *priv = container_of(port, struct eg20t_port, port);
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;
1064 if (priv->mcr & UART_MCR_AFE)
1065 mcr |= UART_MCR_AFE;
1067 if (mctrl)
1068 iowrite8(mcr, priv->membase + UART_MCR);
1071 static void pch_uart_stop_tx(struct uart_port *port)
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;
1079 static void pch_uart_start_tx(struct uart_port *port)
1081 struct eg20t_port *priv;
1083 priv = container_of(port, struct eg20t_port, port);
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;
1093 priv->start_tx = 1;
1094 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
1097 static void pch_uart_stop_rx(struct uart_port *port)
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;
1106 /* Enable the modem status interrupts. */
1107 static void pch_uart_enable_ms(struct uart_port *port)
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);
1114 /* Control the transmission of a break signal. */
1115 static void pch_uart_break_ctl(struct uart_port *port, int ctl)
1117 struct eg20t_port *priv;
1118 unsigned long flags;
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);
1126 /* Grab any interrupt resources and initialise any low level driver state. */
1127 static int pch_uart_startup(struct uart_port *port)
1129 struct eg20t_port *priv;
1130 int ret;
1131 int fifo_size;
1132 int trigger_level;
1134 priv = container_of(port, struct eg20t_port, port);
1135 priv->tx_empty = 1;
1137 if (port->uartclk)
1138 priv->base_baud = port->uartclk;
1139 else
1140 port->uartclk = priv->base_baud;
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;
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;
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;
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;
1186 ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
1187 KBUILD_MODNAME, priv);
1188 if (ret < 0)
1189 return ret;
1191 if (priv->use_dma)
1192 pch_request_dma(port);
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);
1198 return 0;
1201 static void pch_uart_shutdown(struct uart_port *port)
1203 struct eg20t_port *priv;
1204 int ret;
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);
1215 if (priv->use_dma_flag)
1216 pch_free_dma(port);
1218 free_irq(priv->port.irq, priv);
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)
1227 int baud;
1228 int rtn;
1229 unsigned int parity, bits, stb;
1230 struct eg20t_port *priv;
1231 unsigned long flags;
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;
1248 if (termios->c_cflag & CSTOPB)
1249 stb = PCH_UART_HAL_STB2;
1250 else
1251 stb = PCH_UART_HAL_STB1;
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;
1259 } else {
1260 parity = PCH_UART_HAL_PARITY_NONE;
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;
1269 termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
1271 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
1273 spin_lock_irqsave(&port->lock, flags);
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;
1280 /* Don't rewrite B0 */
1281 if (tty_termios_baud_rate(termios))
1282 tty_termios_encode_baud_rate(termios, baud, baud);
1284 out:
1285 spin_unlock_irqrestore(&port->lock, flags);
1288 static const char *pch_uart_type(struct uart_port *port)
1290 return KBUILD_MODNAME;
1293 static void pch_uart_release_port(struct uart_port *port)
1295 struct eg20t_port *priv;
1297 priv = container_of(port, struct eg20t_port, port);
1298 pci_iounmap(priv->pdev, priv->membase);
1299 pci_release_regions(priv->pdev);
1302 static int pch_uart_request_port(struct uart_port *port)
1304 struct eg20t_port *priv;
1305 int ret;
1306 void __iomem *membase;
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;
1313 membase = pci_iomap(priv->pdev, 1, 0);
1314 if (!membase) {
1315 pci_release_regions(priv->pdev);
1316 return -EBUSY;
1318 priv->membase = port->membase = membase;
1320 return 0;
1323 static void pch_uart_config_port(struct uart_port *port, int type)
1325 struct eg20t_port *priv;
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);
1334 static int pch_uart_verify_port(struct uart_port *port,
1335 struct serial_struct *serinfo)
1337 struct eg20t_port *priv;
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");
1356 return 0;
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
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,
1389 static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
1390 const struct pci_device_id *id)
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;
1402 board = &drv_dat[id->driver_data];
1403 port_type = board->port_type;
1405 priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
1406 if (priv == NULL)
1407 goto init_port_alloc_err;
1409 rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1410 if (!rxbuf)
1411 goto init_port_free_txbuf;
1413 base_baud = 1843200; /* 1.8432MHz */
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 */
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;
1432 pci_enable_msi(pdev);
1434 iobase = pci_resource_start(pdev, 0);
1435 mapbase = pci_resource_start(pdev, 1);
1436 priv->mapbase = mapbase;
1437 priv->iobase = iobase;
1438 priv->pdev = pdev;
1439 priv->tx_empty = 1;
1440 priv->rxbuf.buf = rxbuf;
1441 priv->rxbuf.size = PAGE_SIZE;
1443 priv->fifo_size = fifosize;
1444 priv->base_baud = base_baud;
1445 priv->port_type = PORT_MAX_8250 + port_type + 1;
1446 priv->port.dev = &pdev->dev;
1447 priv->port.iobase = iobase;
1448 priv->port.membase = NULL;
1449 priv->port.mapbase = mapbase;
1450 priv->port.irq = pdev->irq;
1451 priv->port.iotype = UPIO_PORT;
1452 priv->port.ops = &pch_uart_ops;
1453 priv->port.flags = UPF_BOOT_AUTOCONF;
1454 priv->port.fifosize = fifosize;
1455 priv->port.line = board->line_no;
1456 priv->trigger = PCH_UART_HAL_TRIGGER_M;
1458 spin_lock_init(&priv->port.lock);
1460 pci_set_drvdata(pdev, priv);
1461 pch_uart_hal_request(pdev, fifosize, base_baud);
1463 ret = uart_add_one_port(&pch_uart_driver, &priv->port);
1464 if (ret < 0)
1465 goto init_port_hal_free;
1467 return priv;
1469 init_port_hal_free:
1470 free_page((unsigned long)rxbuf);
1471 init_port_free_txbuf:
1472 kfree(priv);
1473 init_port_alloc_err:
1475 return NULL;
1478 static void pch_uart_exit_port(struct eg20t_port *priv)
1480 uart_remove_one_port(&pch_uart_driver, &priv->port);
1481 pci_set_drvdata(priv->pdev, NULL);
1482 free_page((unsigned long)priv->rxbuf.buf);
1485 static void pch_uart_pci_remove(struct pci_dev *pdev)
1487 struct eg20t_port *priv;
1489 priv = (struct eg20t_port *)pci_get_drvdata(pdev);
1491 pci_disable_msi(pdev);
1492 pch_uart_exit_port(priv);
1493 pci_disable_device(pdev);
1494 kfree(priv);
1495 return;
1497 #ifdef CONFIG_PM
1498 static int pch_uart_pci_suspend(struct pci_dev *pdev, pm_message_t state)
1500 struct eg20t_port *priv = pci_get_drvdata(pdev);
1502 uart_suspend_port(&pch_uart_driver, &priv->port);
1504 pci_save_state(pdev);
1505 pci_set_power_state(pdev, pci_choose_state(pdev, state));
1506 return 0;
1509 static int pch_uart_pci_resume(struct pci_dev *pdev)
1511 struct eg20t_port *priv = pci_get_drvdata(pdev);
1512 int ret;
1514 pci_set_power_state(pdev, PCI_D0);
1515 pci_restore_state(pdev);
1517 ret = pci_enable_device(pdev);
1518 if (ret) {
1519 dev_err(&pdev->dev,
1520 "%s-pci_enable_device failed(ret=%d) ", __func__, ret);
1521 return ret;
1524 uart_resume_port(&pch_uart_driver, &priv->port);
1526 return 0;
1528 #else
1529 #define pch_uart_pci_suspend NULL
1530 #define pch_uart_pci_resume NULL
1531 #endif
1533 static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = {
1534 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
1535 .driver_data = pch_et20t_uart0},
1536 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
1537 .driver_data = pch_et20t_uart1},
1538 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813),
1539 .driver_data = pch_et20t_uart2},
1540 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
1541 .driver_data = pch_et20t_uart3},
1542 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8027),
1543 .driver_data = pch_ml7213_uart0},
1544 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8028),
1545 .driver_data = pch_ml7213_uart1},
1546 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8029),
1547 .driver_data = pch_ml7213_uart2},
1548 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800C),
1549 .driver_data = pch_ml7223_uart0},
1550 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800D),
1551 .driver_data = pch_ml7223_uart1},
1552 {0,},
1555 static int __devinit pch_uart_pci_probe(struct pci_dev *pdev,
1556 const struct pci_device_id *id)
1558 int ret;
1559 struct eg20t_port *priv;
1561 ret = pci_enable_device(pdev);
1562 if (ret < 0)
1563 goto probe_error;
1565 priv = pch_uart_init_port(pdev, id);
1566 if (!priv) {
1567 ret = -EBUSY;
1568 goto probe_disable_device;
1570 pci_set_drvdata(pdev, priv);
1572 return ret;
1574 probe_disable_device:
1575 pci_disable_msi(pdev);
1576 pci_disable_device(pdev);
1577 probe_error:
1578 return ret;
1581 static struct pci_driver pch_uart_pci_driver = {
1582 .name = "pch_uart",
1583 .id_table = pch_uart_pci_id,
1584 .probe = pch_uart_pci_probe,
1585 .remove = __devexit_p(pch_uart_pci_remove),
1586 .suspend = pch_uart_pci_suspend,
1587 .resume = pch_uart_pci_resume,
1590 static int __init pch_uart_module_init(void)
1592 int ret;
1594 /* register as UART driver */
1595 ret = uart_register_driver(&pch_uart_driver);
1596 if (ret < 0)
1597 return ret;
1599 /* register as PCI driver */
1600 ret = pci_register_driver(&pch_uart_pci_driver);
1601 if (ret < 0)
1602 uart_unregister_driver(&pch_uart_driver);
1604 return ret;
1606 module_init(pch_uart_module_init);
1608 static void __exit pch_uart_module_exit(void)
1610 pci_unregister_driver(&pch_uart_pci_driver);
1611 uart_unregister_driver(&pch_uart_driver);
1613 module_exit(pch_uart_module_exit);
1615 MODULE_LICENSE("GPL v2");
1616 MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
1617 module_param(default_baud, uint, S_IRUGO);