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authorTomoya MORINAGA <tomoya-linux@dsn.okisemi.com>2010-11-16 19:55:54 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2010-11-30 20:23:44 -0500
commit3c6a483275f47a2ef7119309ad3d791c10cf30da (patch)
tree21a0169560b390f14fd70d98439ec189231061d1 /drivers/serial
parent095e24b0ea75b2bdc532b39b04530993442f237f (diff)
Serial: EG20T: add PCH_UART driver
UART driver of Intel EG20T(Topcliff) PCH Intel EG20T PCH is the platform controller hub that is going to be used in Intel's general embedded platform. All IO peripherals in Intel EG20T PCH are actually devices sitting on AMBA bus. Intel EG20T PCH has UART I/F. Using this I/F, it is able to access system devices connected to UART. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/Kconfig8
-rw-r--r--drivers/serial/Makefile1
-rw-r--r--drivers/serial/pch_uart.c1450
3 files changed, 1459 insertions, 0 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 9f6daae5edf2..fa02904c1910 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -1648,4 +1648,12 @@ config SERIAL_IFX6X60
1648 help 1648 help
1649 Support for the IFX6x60 modem devices on Intel MID platforms. 1649 Support for the IFX6x60 modem devices on Intel MID platforms.
1650 1650
1651config SERIAL_PCH_UART
1652 tristate "Intel EG20T PCH UART"
1653 select SERIAL_CORE
1654 depends on PCI
1655 help
1656 This driver is for PCH(Platform controller Hub) UART of Intel EG20T
1657 which is an IOH(Input/Output Hub) for x86 embedded processor.
1658 Enabling PCH_DMA, this PCH UART works as DMA mode.
1651endmenu 1659endmenu
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index a5e2264b2a80..f9b26dfb175d 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -91,3 +91,4 @@ obj-$(CONFIG_SERIAL_MRST_MAX3110) += mrst_max3110.o
91obj-$(CONFIG_SERIAL_MFD_HSU) += mfd.o 91obj-$(CONFIG_SERIAL_MFD_HSU) += mfd.o
92obj-$(CONFIG_SERIAL_OMAP) += omap-serial.o 92obj-$(CONFIG_SERIAL_OMAP) += omap-serial.o
93obj-$(CONFIG_SERIAL_IFX6X60) += ifx6x60.o 93obj-$(CONFIG_SERIAL_IFX6X60) += ifx6x60.o
94obj-$(CONFIG_SERIAL_PCH_UART) += pch_uart.o
diff --git a/drivers/serial/pch_uart.c b/drivers/serial/pch_uart.c
new file mode 100644
index 000000000000..b94d1fa76973
--- /dev/null
+++ b/drivers/serial/pch_uart.c
@@ -0,0 +1,1450 @@
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), (int)priv->rx_buf_virt & ~PAGE_MASK);
686
687 sg_dma_address(sg) = priv->rx_buf_dma;
688
689 desc = priv->chan_rx->device->device_prep_slave_sg(priv->chan_rx,
690 sg, 1, DMA_FROM_DEVICE,
691 DMA_PREP_INTERRUPT);
692 if (!desc)
693 return 0;
694
695 priv->desc_rx = desc;
696 desc->callback = pch_dma_rx_complete;
697 desc->callback_param = priv;
698 desc->tx_submit(desc);
699 dma_async_issue_pending(priv->chan_rx);
700
701 return PCH_UART_HANDLED_RX_INT;
702}
703
704static unsigned int handle_tx(struct eg20t_port *priv)
705{
706 struct uart_port *port = &priv->port;
707 struct circ_buf *xmit = &port->state->xmit;
708 int ret;
709 int fifo_size;
710 int tx_size;
711 int size;
712 int tx_empty;
713
714 if (!priv->start_tx) {
715 pr_info("%s:Tx isn't started. (%lu)\n", __func__, jiffies);
716 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
717 priv->tx_empty = 1;
718 return 0;
719 }
720
721 fifo_size = max(priv->fifo_size, 1);
722 tx_empty = 1;
723 if (pop_tx_x(priv, xmit->buf)) {
724 pch_uart_hal_write(priv, xmit->buf, 1);
725 port->icount.tx++;
726 tx_empty = 0;
727 fifo_size--;
728 }
729 size = min(xmit->head - xmit->tail, fifo_size);
730 tx_size = pop_tx(priv, xmit->buf, size);
731 if (tx_size > 0) {
732 ret = pch_uart_hal_write(priv, xmit->buf, tx_size);
733 port->icount.tx += ret;
734 tx_empty = 0;
735 }
736
737 priv->tx_empty = tx_empty;
738
739 if (tx_empty)
740 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
741
742 return PCH_UART_HANDLED_TX_INT;
743}
744
745static unsigned int dma_handle_tx(struct eg20t_port *priv)
746{
747 struct uart_port *port = &priv->port;
748 struct circ_buf *xmit = &port->state->xmit;
749 struct scatterlist *sg = &priv->sg_tx;
750 int nent;
751 int fifo_size;
752 int tx_empty;
753 struct dma_async_tx_descriptor *desc;
754
755 if (!priv->start_tx) {
756 pr_info("%s:Tx isn't started. (%lu)\n", __func__, jiffies);
757 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
758 priv->tx_empty = 1;
759 return 0;
760 }
761
762 fifo_size = max(priv->fifo_size, 1);
763 tx_empty = 1;
764 if (pop_tx_x(priv, xmit->buf)) {
765 pch_uart_hal_write(priv, xmit->buf, 1);
766 port->icount.tx++;
767 tx_empty = 0;
768 fifo_size--;
769 }
770
771 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
772
773 priv->tx_dma_use = 1;
774
775 sg_init_table(&priv->sg_tx, 1); /* Initialize SG table */
776
777 sg_set_page(&priv->sg_tx, virt_to_page(xmit->buf),
778 UART_XMIT_SIZE, (int)xmit->buf & ~PAGE_MASK);
779
780 nent = dma_map_sg(port->dev, &priv->sg_tx, 1, DMA_TO_DEVICE);
781 if (!nent) {
782 pr_err("%s:dma_map_sg Failed\n", __func__);
783 return 0;
784 }
785
786 sg->offset = xmit->tail & (UART_XMIT_SIZE - 1);
787 sg_dma_address(sg) = (sg_dma_address(sg) & ~(UART_XMIT_SIZE - 1)) +
788 sg->offset;
789 sg_dma_len(sg) = min((int)CIRC_CNT(xmit->head, xmit->tail,
790 UART_XMIT_SIZE), CIRC_CNT_TO_END(xmit->head,
791 xmit->tail, UART_XMIT_SIZE));
792
793 desc = priv->chan_tx->device->device_prep_slave_sg(priv->chan_tx,
794 sg, nent, DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
795 if (!desc) {
796 pr_err("%s:device_prep_slave_sg Failed\n", __func__);
797 return 0;
798 }
799
800 dma_sync_sg_for_device(port->dev, sg, 1, DMA_TO_DEVICE);
801
802 priv->desc_tx = desc;
803 desc->callback = pch_dma_tx_complete;
804 desc->callback_param = priv;
805
806 desc->tx_submit(desc);
807
808 dma_async_issue_pending(priv->chan_tx);
809
810 return PCH_UART_HANDLED_TX_INT;
811}
812
813static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
814{
815 u8 fcr = ioread8(priv->membase + UART_FCR);
816
817 /* Reset FIFO */
818 fcr |= UART_FCR_CLEAR_RCVR;
819 iowrite8(fcr, priv->membase + UART_FCR);
820
821 if (lsr & PCH_UART_LSR_ERR)
822 dev_err(&priv->pdev->dev, "Error data in FIFO\n");
823
824 if (lsr & UART_LSR_FE)
825 dev_err(&priv->pdev->dev, "Framing Error\n");
826
827 if (lsr & UART_LSR_PE)
828 dev_err(&priv->pdev->dev, "Parity Error\n");
829
830 if (lsr & UART_LSR_OE)
831 dev_err(&priv->pdev->dev, "Overrun Error\n");
832}
833
834static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
835{
836 struct eg20t_port *priv = dev_id;
837 unsigned int handled;
838 u8 lsr;
839 int ret = 0;
840 unsigned int iid;
841 unsigned long flags;
842
843 spin_lock_irqsave(&priv->port.lock, flags);
844 handled = 0;
845 while ((iid = pch_uart_hal_get_iid(priv)) > 1) {
846 switch (iid) {
847 case PCH_UART_IID_RLS: /* Receiver Line Status */
848 lsr = pch_uart_hal_get_line_status(priv);
849 if (lsr & (PCH_UART_LSR_ERR | UART_LSR_FE |
850 UART_LSR_PE | UART_LSR_OE)) {
851 pch_uart_err_ir(priv, lsr);
852 ret = PCH_UART_HANDLED_RX_ERR_INT;
853 }
854 break;
855 case PCH_UART_IID_RDR: /* Received Data Ready */
856 if (priv->use_dma)
857 ret = dma_handle_rx(priv);
858 else
859 ret = handle_rx(priv);
860 break;
861 case PCH_UART_IID_RDR_TO: /* Received Data Ready
862 (FIFO Timeout) */
863 ret = handle_rx_to(priv);
864 break;
865 case PCH_UART_IID_THRE: /* Transmitter Holding Register
866 Empty */
867 if (priv->use_dma)
868 ret = dma_handle_tx(priv);
869 else
870 ret = handle_tx(priv);
871 break;
872 case PCH_UART_IID_MS: /* Modem Status */
873 ret = PCH_UART_HANDLED_MS_INT;
874 break;
875 default: /* Never junp to this label */
876 pr_err("%s:iid=%d (%lu)\n", __func__, iid, jiffies);
877 ret = -1;
878 break;
879 }
880 handled |= (unsigned int)ret;
881 }
882 if (handled == 0 && iid <= 1) {
883 if (priv->int_dis_flag)
884 priv->int_dis_flag = 0;
885 }
886
887 spin_unlock_irqrestore(&priv->port.lock, flags);
888 return IRQ_RETVAL(handled);
889}
890
891/* This function tests whether the transmitter fifo and shifter for the port
892 described by 'port' is empty. */
893static unsigned int pch_uart_tx_empty(struct uart_port *port)
894{
895 struct eg20t_port *priv;
896 int ret;
897 priv = container_of(port, struct eg20t_port, port);
898 if (priv->tx_empty)
899 ret = TIOCSER_TEMT;
900 else
901 ret = 0;
902
903 return ret;
904}
905
906/* Returns the current state of modem control inputs. */
907static unsigned int pch_uart_get_mctrl(struct uart_port *port)
908{
909 struct eg20t_port *priv;
910 u8 modem;
911 unsigned int ret = 0;
912
913 priv = container_of(port, struct eg20t_port, port);
914 modem = pch_uart_hal_get_modem(priv);
915
916 if (modem & UART_MSR_DCD)
917 ret |= TIOCM_CAR;
918
919 if (modem & UART_MSR_RI)
920 ret |= TIOCM_RNG;
921
922 if (modem & UART_MSR_DSR)
923 ret |= TIOCM_DSR;
924
925 if (modem & UART_MSR_CTS)
926 ret |= TIOCM_CTS;
927
928 return ret;
929}
930
931static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
932{
933 u32 mcr = 0;
934 unsigned int dat;
935 struct eg20t_port *priv = container_of(port, struct eg20t_port, port);
936
937 if (mctrl & TIOCM_DTR)
938 mcr |= UART_MCR_DTR;
939 if (mctrl & TIOCM_RTS)
940 mcr |= UART_MCR_RTS;
941 if (mctrl & TIOCM_LOOP)
942 mcr |= UART_MCR_LOOP;
943
944 if (mctrl) {
945 dat = pch_uart_get_mctrl(port);
946 dat |= mcr;
947 iowrite8(dat, priv->membase + UART_MCR);
948 }
949}
950
951static void pch_uart_stop_tx(struct uart_port *port)
952{
953 struct eg20t_port *priv;
954 priv = container_of(port, struct eg20t_port, port);
955 priv->start_tx = 0;
956 priv->tx_dma_use = 0;
957}
958
959static void pch_uart_start_tx(struct uart_port *port)
960{
961 struct eg20t_port *priv;
962
963 priv = container_of(port, struct eg20t_port, port);
964
965 if (priv->use_dma)
966 if (priv->tx_dma_use)
967 return;
968
969 priv->start_tx = 1;
970 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
971}
972
973static void pch_uart_stop_rx(struct uart_port *port)
974{
975 struct eg20t_port *priv;
976 priv = container_of(port, struct eg20t_port, port);
977 priv->start_rx = 0;
978 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT);
979 priv->int_dis_flag = 1;
980}
981
982/* Enable the modem status interrupts. */
983static void pch_uart_enable_ms(struct uart_port *port)
984{
985 struct eg20t_port *priv;
986 priv = container_of(port, struct eg20t_port, port);
987 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_MS_INT);
988}
989
990/* Control the transmission of a break signal. */
991static void pch_uart_break_ctl(struct uart_port *port, int ctl)
992{
993 struct eg20t_port *priv;
994 unsigned long flags;
995
996 priv = container_of(port, struct eg20t_port, port);
997 spin_lock_irqsave(&port->lock, flags);
998 pch_uart_hal_set_break(priv, ctl);
999 spin_unlock_irqrestore(&port->lock, flags);
1000}
1001
1002/* Grab any interrupt resources and initialise any low level driver state. */
1003static int pch_uart_startup(struct uart_port *port)
1004{
1005 struct eg20t_port *priv;
1006 int ret;
1007 int fifo_size;
1008 int trigger_level;
1009
1010 priv = container_of(port, struct eg20t_port, port);
1011 priv->tx_empty = 1;
1012 port->uartclk = priv->base_baud;
1013 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1014 ret = pch_uart_hal_set_line(priv, default_baud,
1015 PCH_UART_HAL_PARITY_NONE, PCH_UART_HAL_8BIT,
1016 PCH_UART_HAL_STB1);
1017 if (ret)
1018 return ret;
1019
1020 switch (priv->fifo_size) {
1021 case 256:
1022 fifo_size = PCH_UART_HAL_FIFO256;
1023 break;
1024 case 64:
1025 fifo_size = PCH_UART_HAL_FIFO64;
1026 break;
1027 case 16:
1028 fifo_size = PCH_UART_HAL_FIFO16;
1029 case 1:
1030 default:
1031 fifo_size = PCH_UART_HAL_FIFO_DIS;
1032 break;
1033 }
1034
1035 switch (priv->trigger) {
1036 case PCH_UART_HAL_TRIGGER1:
1037 trigger_level = 1;
1038 break;
1039 case PCH_UART_HAL_TRIGGER_L:
1040 trigger_level = priv->fifo_size / 4;
1041 break;
1042 case PCH_UART_HAL_TRIGGER_M:
1043 trigger_level = priv->fifo_size / 2;
1044 break;
1045 case PCH_UART_HAL_TRIGGER_H:
1046 default:
1047 trigger_level = priv->fifo_size - (priv->fifo_size / 8);
1048 break;
1049 }
1050
1051 priv->trigger_level = trigger_level;
1052 ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1053 fifo_size, priv->trigger);
1054 if (ret < 0)
1055 return ret;
1056
1057 ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
1058 KBUILD_MODNAME, priv);
1059 if (ret < 0)
1060 return ret;
1061
1062 if (priv->use_dma)
1063 pch_request_dma(port);
1064
1065 priv->start_rx = 1;
1066 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT);
1067 uart_update_timeout(port, CS8, default_baud);
1068
1069 return 0;
1070}
1071
1072static void pch_uart_shutdown(struct uart_port *port)
1073{
1074 struct eg20t_port *priv;
1075 int ret;
1076
1077 priv = container_of(port, struct eg20t_port, port);
1078 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1079 pch_uart_hal_fifo_reset(priv, PCH_UART_HAL_CLR_ALL_FIFO);
1080 ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1081 PCH_UART_HAL_FIFO_DIS, PCH_UART_HAL_TRIGGER1);
1082 if (ret)
1083 pr_err("pch_uart_hal_set_fifo Failed(ret=%d)\n", ret);
1084
1085 if (priv->use_dma_flag)
1086 pch_free_dma(port);
1087
1088 free_irq(priv->port.irq, priv);
1089}
1090
1091/* Change the port parameters, including word length, parity, stop
1092 *bits. Update read_status_mask and ignore_status_mask to indicate
1093 *the types of events we are interested in receiving. */
1094static void pch_uart_set_termios(struct uart_port *port,
1095 struct ktermios *termios, struct ktermios *old)
1096{
1097 int baud;
1098 int rtn;
1099 unsigned int parity, bits, stb;
1100 struct eg20t_port *priv;
1101 unsigned long flags;
1102
1103 priv = container_of(port, struct eg20t_port, port);
1104 switch (termios->c_cflag & CSIZE) {
1105 case CS5:
1106 bits = PCH_UART_HAL_5BIT;
1107 break;
1108 case CS6:
1109 bits = PCH_UART_HAL_6BIT;
1110 break;
1111 case CS7:
1112 bits = PCH_UART_HAL_7BIT;
1113 break;
1114 default: /* CS8 */
1115 bits = PCH_UART_HAL_8BIT;
1116 break;
1117 }
1118 if (termios->c_cflag & CSTOPB)
1119 stb = PCH_UART_HAL_STB2;
1120 else
1121 stb = PCH_UART_HAL_STB1;
1122
1123 if (termios->c_cflag & PARENB) {
1124 if (!(termios->c_cflag & PARODD))
1125 parity = PCH_UART_HAL_PARITY_ODD;
1126 else
1127 parity = PCH_UART_HAL_PARITY_EVEN;
1128
1129 } else {
1130 parity = PCH_UART_HAL_PARITY_NONE;
1131 }
1132 termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
1133
1134 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
1135
1136 spin_lock_irqsave(&port->lock, flags);
1137
1138 uart_update_timeout(port, termios->c_cflag, baud);
1139 rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb);
1140 if (rtn)
1141 goto out;
1142
1143 /* Don't rewrite B0 */
1144 if (tty_termios_baud_rate(termios))
1145 tty_termios_encode_baud_rate(termios, baud, baud);
1146
1147out:
1148 spin_unlock_irqrestore(&port->lock, flags);
1149}
1150
1151static const char *pch_uart_type(struct uart_port *port)
1152{
1153 return KBUILD_MODNAME;
1154}
1155
1156static void pch_uart_release_port(struct uart_port *port)
1157{
1158 struct eg20t_port *priv;
1159
1160 priv = container_of(port, struct eg20t_port, port);
1161 pci_iounmap(priv->pdev, priv->membase);
1162 pci_release_regions(priv->pdev);
1163}
1164
1165static int pch_uart_request_port(struct uart_port *port)
1166{
1167 struct eg20t_port *priv;
1168 int ret;
1169 void __iomem *membase;
1170
1171 priv = container_of(port, struct eg20t_port, port);
1172 ret = pci_request_regions(priv->pdev, KBUILD_MODNAME);
1173 if (ret < 0)
1174 return -EBUSY;
1175
1176 membase = pci_iomap(priv->pdev, 1, 0);
1177 if (!membase) {
1178 pci_release_regions(priv->pdev);
1179 return -EBUSY;
1180 }
1181 priv->membase = port->membase = membase;
1182
1183 return 0;
1184}
1185
1186static void pch_uart_config_port(struct uart_port *port, int type)
1187{
1188 struct eg20t_port *priv;
1189
1190 priv = container_of(port, struct eg20t_port, port);
1191 if (type & UART_CONFIG_TYPE) {
1192 port->type = priv->port_type;
1193 pch_uart_request_port(port);
1194 }
1195}
1196
1197static int pch_uart_verify_port(struct uart_port *port,
1198 struct serial_struct *serinfo)
1199{
1200 struct eg20t_port *priv;
1201
1202 priv = container_of(port, struct eg20t_port, port);
1203 if (serinfo->flags & UPF_LOW_LATENCY) {
1204 pr_info("PCH UART : Use PIO Mode (without DMA)\n");
1205 priv->use_dma = 0;
1206 serinfo->flags &= ~UPF_LOW_LATENCY;
1207 } else {
1208#ifndef CONFIG_PCH_DMA
1209 pr_err("%s : PCH DMA is not Loaded.\n", __func__);
1210 return -EOPNOTSUPP;
1211#endif
1212 priv->use_dma = 1;
1213 priv->use_dma_flag = 1;
1214 pr_info("PCH UART : Use DMA Mode\n");
1215 }
1216
1217 return 0;
1218}
1219
1220static struct uart_ops pch_uart_ops = {
1221 .tx_empty = pch_uart_tx_empty,
1222 .set_mctrl = pch_uart_set_mctrl,
1223 .get_mctrl = pch_uart_get_mctrl,
1224 .stop_tx = pch_uart_stop_tx,
1225 .start_tx = pch_uart_start_tx,
1226 .stop_rx = pch_uart_stop_rx,
1227 .enable_ms = pch_uart_enable_ms,
1228 .break_ctl = pch_uart_break_ctl,
1229 .startup = pch_uart_startup,
1230 .shutdown = pch_uart_shutdown,
1231 .set_termios = pch_uart_set_termios,
1232/* .pm = pch_uart_pm, Not supported yet */
1233/* .set_wake = pch_uart_set_wake, Not supported yet */
1234 .type = pch_uart_type,
1235 .release_port = pch_uart_release_port,
1236 .request_port = pch_uart_request_port,
1237 .config_port = pch_uart_config_port,
1238 .verify_port = pch_uart_verify_port
1239};
1240
1241static struct uart_driver pch_uart_driver = {
1242 .owner = THIS_MODULE,
1243 .driver_name = KBUILD_MODNAME,
1244 .dev_name = PCH_UART_DRIVER_DEVICE,
1245 .major = 0,
1246 .minor = 0,
1247 .nr = PCH_UART_NR,
1248};
1249
1250static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
1251 int port_type)
1252{
1253 struct eg20t_port *priv;
1254 int ret;
1255 unsigned int iobase;
1256 unsigned int mapbase;
1257 unsigned int rxbuf;
1258 int fifosize, base_baud;
1259 static int num;
1260
1261 priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
1262 if (priv == NULL)
1263 goto init_port_alloc_err;
1264
1265 rxbuf = __get_free_page(GFP_KERNEL);
1266 if (!rxbuf)
1267 goto init_port_free_txbuf;
1268
1269 switch (port_type) {
1270 case PORT_UNKNOWN:
1271 fifosize = 256; /* UART0 */
1272 base_baud = 1843200; /* 1.8432MHz */
1273 break;
1274 case PORT_8250:
1275 fifosize = 64; /* UART1~3 */
1276 base_baud = 1843200; /* 1.8432MHz */
1277 break;
1278 default:
1279 dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type);
1280 goto init_port_hal_free;
1281 }
1282
1283 iobase = pci_resource_start(pdev, 0);
1284 mapbase = pci_resource_start(pdev, 1);
1285 priv->mapbase = mapbase;
1286 priv->iobase = iobase;
1287 priv->pdev = pdev;
1288 priv->tx_empty = 1;
1289 priv->rxbuf.buf = (unsigned char *)rxbuf;
1290 priv->rxbuf.size = PAGE_SIZE;
1291
1292 priv->fifo_size = fifosize;
1293 priv->base_baud = base_baud;
1294 priv->port_type = PORT_MAX_8250 + port_type + 1;
1295 priv->port.dev = &pdev->dev;
1296 priv->port.iobase = iobase;
1297 priv->port.membase = NULL;
1298 priv->port.mapbase = mapbase;
1299 priv->port.irq = pdev->irq;
1300 priv->port.iotype = UPIO_PORT;
1301 priv->port.ops = &pch_uart_ops;
1302 priv->port.flags = UPF_BOOT_AUTOCONF;
1303 priv->port.fifosize = fifosize;
1304 priv->port.line = num++;
1305 priv->trigger = PCH_UART_HAL_TRIGGER_M;
1306
1307 pci_set_drvdata(pdev, priv);
1308 pch_uart_hal_request(pdev, fifosize, base_baud);
1309 ret = uart_add_one_port(&pch_uart_driver, &priv->port);
1310 if (ret < 0)
1311 goto init_port_hal_free;
1312
1313 return priv;
1314
1315init_port_hal_free:
1316 free_page(rxbuf);
1317init_port_free_txbuf:
1318 kfree(priv);
1319init_port_alloc_err:
1320
1321 return NULL;
1322}
1323
1324static void pch_uart_exit_port(struct eg20t_port *priv)
1325{
1326 uart_remove_one_port(&pch_uart_driver, &priv->port);
1327 pci_set_drvdata(priv->pdev, NULL);
1328 free_page((unsigned int)priv->rxbuf.buf);
1329}
1330
1331static void pch_uart_pci_remove(struct pci_dev *pdev)
1332{
1333 struct eg20t_port *priv;
1334
1335 priv = (struct eg20t_port *)pci_get_drvdata(pdev);
1336 pch_uart_exit_port(priv);
1337 pci_disable_device(pdev);
1338 kfree(priv);
1339 return;
1340}
1341#ifdef CONFIG_PM
1342static int pch_uart_pci_suspend(struct pci_dev *pdev, pm_message_t state)
1343{
1344 struct eg20t_port *priv = pci_get_drvdata(pdev);
1345
1346 uart_suspend_port(&pch_uart_driver, &priv->port);
1347
1348 pci_save_state(pdev);
1349 pci_set_power_state(pdev, pci_choose_state(pdev, state));
1350 return 0;
1351}
1352
1353static int pch_uart_pci_resume(struct pci_dev *pdev)
1354{
1355 struct eg20t_port *priv = pci_get_drvdata(pdev);
1356 int ret;
1357
1358 pci_set_power_state(pdev, PCI_D0);
1359 pci_restore_state(pdev);
1360
1361 ret = pci_enable_device(pdev);
1362 if (ret) {
1363 dev_err(&pdev->dev,
1364 "%s-pci_enable_device failed(ret=%d) ", __func__, ret);
1365 return ret;
1366 }
1367
1368 uart_resume_port(&pch_uart_driver, &priv->port);
1369
1370 return 0;
1371}
1372#else
1373#define pch_uart_pci_suspend NULL
1374#define pch_uart_pci_resume NULL
1375#endif
1376
1377static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = {
1378 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
1379 .driver_data = PCH_UART_8LINE},
1380 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
1381 .driver_data = PCH_UART_2LINE},
1382 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813),
1383 .driver_data = PCH_UART_2LINE},
1384 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
1385 .driver_data = PCH_UART_2LINE},
1386 {0,},
1387};
1388
1389static int __devinit pch_uart_pci_probe(struct pci_dev *pdev,
1390 const struct pci_device_id *id)
1391{
1392 int ret;
1393 struct eg20t_port *priv;
1394
1395 ret = pci_enable_device(pdev);
1396 if (ret < 0)
1397 goto probe_error;
1398
1399 priv = pch_uart_init_port(pdev, id->driver_data);
1400 if (!priv) {
1401 ret = -EBUSY;
1402 goto probe_disable_device;
1403 }
1404 pci_set_drvdata(pdev, priv);
1405
1406 return ret;
1407
1408probe_disable_device:
1409 pci_disable_device(pdev);
1410probe_error:
1411 return ret;
1412}
1413
1414static struct pci_driver pch_uart_pci_driver = {
1415 .name = "pch_uart",
1416 .id_table = pch_uart_pci_id,
1417 .probe = pch_uart_pci_probe,
1418 .remove = __devexit_p(pch_uart_pci_remove),
1419 .suspend = pch_uart_pci_suspend,
1420 .resume = pch_uart_pci_resume,
1421};
1422
1423static int __init pch_uart_module_init(void)
1424{
1425 int ret;
1426
1427 /* register as UART driver */
1428 ret = uart_register_driver(&pch_uart_driver);
1429 if (ret < 0)
1430 return ret;
1431
1432 /* register as PCI driver */
1433 ret = pci_register_driver(&pch_uart_pci_driver);
1434 if (ret < 0)
1435 uart_unregister_driver(&pch_uart_driver);
1436
1437 return ret;
1438}
1439module_init(pch_uart_module_init);
1440
1441static void __exit pch_uart_module_exit(void)
1442{
1443 pci_unregister_driver(&pch_uart_pci_driver);
1444 uart_unregister_driver(&pch_uart_driver);
1445}
1446module_exit(pch_uart_module_exit);
1447
1448MODULE_LICENSE("GPL v2");
1449MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
1450module_param(default_baud, uint, S_IRUGO);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-08 02:41:10 -0500