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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * SH SPI bus driver
4 *
5 * Copyright (C) 2011 Renesas Solutions Corp.
6 *
7 * Based on pxa2xx_spi.c:
8 * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
9 */
10
11#include <linux/module.h>
12#include <linux/kernel.h>
13#include <linux/sched.h>
14#include <linux/errno.h>
15#include <linux/timer.h>
16#include <linux/delay.h>
17#include <linux/list.h>
18#include <linux/workqueue.h>
19#include <linux/interrupt.h>
20#include <linux/platform_device.h>
21#include <linux/io.h>
22#include <linux/spi/spi.h>
23
24#define SPI_SH_TBR 0x00
25#define SPI_SH_RBR 0x00
26#define SPI_SH_CR1 0x08
27#define SPI_SH_CR2 0x10
28#define SPI_SH_CR3 0x18
29#define SPI_SH_CR4 0x20
30#define SPI_SH_CR5 0x28
31
32/* CR1 */
33#define SPI_SH_TBE 0x80
34#define SPI_SH_TBF 0x40
35#define SPI_SH_RBE 0x20
36#define SPI_SH_RBF 0x10
37#define SPI_SH_PFONRD 0x08
38#define SPI_SH_SSDB 0x04
39#define SPI_SH_SSD 0x02
40#define SPI_SH_SSA 0x01
41
42/* CR2 */
43#define SPI_SH_RSTF 0x80
44#define SPI_SH_LOOPBK 0x40
45#define SPI_SH_CPOL 0x20
46#define SPI_SH_CPHA 0x10
47#define SPI_SH_L1M0 0x08
48
49/* CR3 */
50#define SPI_SH_MAX_BYTE 0xFF
51
52/* CR4 */
53#define SPI_SH_TBEI 0x80
54#define SPI_SH_TBFI 0x40
55#define SPI_SH_RBEI 0x20
56#define SPI_SH_RBFI 0x10
57#define SPI_SH_WPABRT 0x04
58#define SPI_SH_SSS 0x01
59
60/* CR8 */
61#define SPI_SH_P1L0 0x80
62#define SPI_SH_PP1L0 0x40
63#define SPI_SH_MUXI 0x20
64#define SPI_SH_MUXIRQ 0x10
65
66#define SPI_SH_FIFO_SIZE 32
67#define SPI_SH_SEND_TIMEOUT (3 * HZ)
68#define SPI_SH_RECEIVE_TIMEOUT (HZ >> 3)
69
70#undef DEBUG
71
72struct spi_sh_data {
73 void __iomem *addr;
74 int irq;
75 struct spi_controller *host;
76 unsigned long cr1;
77 wait_queue_head_t wait;
78 int width;
79};
80
81static void spi_sh_write(struct spi_sh_data *ss, unsigned long data,
82 unsigned long offset)
83{
84 if (ss->width == 8)
85 iowrite8(data, ss->addr + (offset >> 2));
86 else if (ss->width == 32)
87 iowrite32(data, ss->addr + offset);
88}
89
90static unsigned long spi_sh_read(struct spi_sh_data *ss, unsigned long offset)
91{
92 if (ss->width == 8)
93 return ioread8(ss->addr + (offset >> 2));
94 else if (ss->width == 32)
95 return ioread32(ss->addr + offset);
96 else
97 return 0;
98}
99
100static void spi_sh_set_bit(struct spi_sh_data *ss, unsigned long val,
101 unsigned long offset)
102{
103 unsigned long tmp;
104
105 tmp = spi_sh_read(ss, offset);
106 tmp |= val;
107 spi_sh_write(ss, tmp, offset);
108}
109
110static void spi_sh_clear_bit(struct spi_sh_data *ss, unsigned long val,
111 unsigned long offset)
112{
113 unsigned long tmp;
114
115 tmp = spi_sh_read(ss, offset);
116 tmp &= ~val;
117 spi_sh_write(ss, tmp, offset);
118}
119
120static void clear_fifo(struct spi_sh_data *ss)
121{
122 spi_sh_set_bit(ss, SPI_SH_RSTF, SPI_SH_CR2);
123 spi_sh_clear_bit(ss, SPI_SH_RSTF, SPI_SH_CR2);
124}
125
126static int spi_sh_wait_receive_buffer(struct spi_sh_data *ss)
127{
128 int timeout = 100000;
129
130 while (spi_sh_read(ss, SPI_SH_CR1) & SPI_SH_RBE) {
131 udelay(10);
132 if (timeout-- < 0)
133 return -ETIMEDOUT;
134 }
135 return 0;
136}
137
138static int spi_sh_wait_write_buffer_empty(struct spi_sh_data *ss)
139{
140 int timeout = 100000;
141
142 while (!(spi_sh_read(ss, SPI_SH_CR1) & SPI_SH_TBE)) {
143 udelay(10);
144 if (timeout-- < 0)
145 return -ETIMEDOUT;
146 }
147 return 0;
148}
149
150static int spi_sh_send(struct spi_sh_data *ss, struct spi_message *mesg,
151 struct spi_transfer *t)
152{
153 int i, retval = 0;
154 int remain = t->len;
155 int cur_len;
156 unsigned char *data;
157 long ret;
158
159 if (t->len)
160 spi_sh_set_bit(ss, SPI_SH_SSA, SPI_SH_CR1);
161
162 data = (unsigned char *)t->tx_buf;
163 while (remain > 0) {
164 cur_len = min(SPI_SH_FIFO_SIZE, remain);
165 for (i = 0; i < cur_len &&
166 !(spi_sh_read(ss, SPI_SH_CR4) &
167 SPI_SH_WPABRT) &&
168 !(spi_sh_read(ss, SPI_SH_CR1) & SPI_SH_TBF);
169 i++)
170 spi_sh_write(ss, (unsigned long)data[i], SPI_SH_TBR);
171
172 if (spi_sh_read(ss, SPI_SH_CR4) & SPI_SH_WPABRT) {
173 /* Abort SPI operation */
174 spi_sh_set_bit(ss, SPI_SH_WPABRT, SPI_SH_CR4);
175 retval = -EIO;
176 break;
177 }
178
179 cur_len = i;
180
181 remain -= cur_len;
182 data += cur_len;
183
184 if (remain > 0) {
185 ss->cr1 &= ~SPI_SH_TBE;
186 spi_sh_set_bit(ss, SPI_SH_TBE, SPI_SH_CR4);
187 ret = wait_event_interruptible_timeout(ss->wait,
188 ss->cr1 & SPI_SH_TBE,
189 SPI_SH_SEND_TIMEOUT);
190 if (ret == 0 && !(ss->cr1 & SPI_SH_TBE)) {
191 printk(KERN_ERR "%s: timeout\n", __func__);
192 return -ETIMEDOUT;
193 }
194 }
195 }
196
197 if (list_is_last(&t->transfer_list, &mesg->transfers)) {
198 spi_sh_clear_bit(ss, SPI_SH_SSD | SPI_SH_SSDB, SPI_SH_CR1);
199 spi_sh_set_bit(ss, SPI_SH_SSA, SPI_SH_CR1);
200
201 ss->cr1 &= ~SPI_SH_TBE;
202 spi_sh_set_bit(ss, SPI_SH_TBE, SPI_SH_CR4);
203 ret = wait_event_interruptible_timeout(ss->wait,
204 ss->cr1 & SPI_SH_TBE,
205 SPI_SH_SEND_TIMEOUT);
206 if (ret == 0 && (ss->cr1 & SPI_SH_TBE)) {
207 printk(KERN_ERR "%s: timeout\n", __func__);
208 return -ETIMEDOUT;
209 }
210 }
211
212 return retval;
213}
214
215static int spi_sh_receive(struct spi_sh_data *ss, struct spi_message *mesg,
216 struct spi_transfer *t)
217{
218 int i;
219 int remain = t->len;
220 int cur_len;
221 unsigned char *data;
222 long ret;
223
224 if (t->len > SPI_SH_MAX_BYTE)
225 spi_sh_write(ss, SPI_SH_MAX_BYTE, SPI_SH_CR3);
226 else
227 spi_sh_write(ss, t->len, SPI_SH_CR3);
228
229 spi_sh_clear_bit(ss, SPI_SH_SSD | SPI_SH_SSDB, SPI_SH_CR1);
230 spi_sh_set_bit(ss, SPI_SH_SSA, SPI_SH_CR1);
231
232 spi_sh_wait_write_buffer_empty(ss);
233
234 data = (unsigned char *)t->rx_buf;
235 while (remain > 0) {
236 if (remain >= SPI_SH_FIFO_SIZE) {
237 ss->cr1 &= ~SPI_SH_RBF;
238 spi_sh_set_bit(ss, SPI_SH_RBF, SPI_SH_CR4);
239 ret = wait_event_interruptible_timeout(ss->wait,
240 ss->cr1 & SPI_SH_RBF,
241 SPI_SH_RECEIVE_TIMEOUT);
242 if (ret == 0 &&
243 spi_sh_read(ss, SPI_SH_CR1) & SPI_SH_RBE) {
244 printk(KERN_ERR "%s: timeout\n", __func__);
245 return -ETIMEDOUT;
246 }
247 }
248
249 cur_len = min(SPI_SH_FIFO_SIZE, remain);
250 for (i = 0; i < cur_len; i++) {
251 if (spi_sh_wait_receive_buffer(ss))
252 break;
253 data[i] = (unsigned char)spi_sh_read(ss, SPI_SH_RBR);
254 }
255
256 remain -= cur_len;
257 data += cur_len;
258 }
259
260 /* deassert CS when SPI is receiving. */
261 if (t->len > SPI_SH_MAX_BYTE) {
262 clear_fifo(ss);
263 spi_sh_write(ss, 1, SPI_SH_CR3);
264 } else {
265 spi_sh_write(ss, 0, SPI_SH_CR3);
266 }
267
268 return 0;
269}
270
271static int spi_sh_transfer_one_message(struct spi_controller *ctlr,
272 struct spi_message *mesg)
273{
274 struct spi_sh_data *ss = spi_controller_get_devdata(ctlr);
275 struct spi_transfer *t;
276 int ret;
277
278 pr_debug("%s: enter\n", __func__);
279
280 spi_sh_clear_bit(ss, SPI_SH_SSA, SPI_SH_CR1);
281
282 list_for_each_entry(t, &mesg->transfers, transfer_list) {
283 pr_debug("tx_buf = %p, rx_buf = %p\n",
284 t->tx_buf, t->rx_buf);
285 pr_debug("len = %d, delay.value = %d\n",
286 t->len, t->delay.value);
287
288 if (t->tx_buf) {
289 ret = spi_sh_send(ss, mesg, t);
290 if (ret < 0)
291 goto error;
292 }
293 if (t->rx_buf) {
294 ret = spi_sh_receive(ss, mesg, t);
295 if (ret < 0)
296 goto error;
297 }
298 mesg->actual_length += t->len;
299 }
300
301 mesg->status = 0;
302 spi_finalize_current_message(ctlr);
303
304 clear_fifo(ss);
305 spi_sh_set_bit(ss, SPI_SH_SSD, SPI_SH_CR1);
306 udelay(100);
307
308 spi_sh_clear_bit(ss, SPI_SH_SSA | SPI_SH_SSDB | SPI_SH_SSD,
309 SPI_SH_CR1);
310
311 clear_fifo(ss);
312
313 return 0;
314
315 error:
316 mesg->status = ret;
317 spi_finalize_current_message(ctlr);
318 if (mesg->complete)
319 mesg->complete(mesg->context);
320
321 spi_sh_clear_bit(ss, SPI_SH_SSA | SPI_SH_SSDB | SPI_SH_SSD,
322 SPI_SH_CR1);
323 clear_fifo(ss);
324
325 return ret;
326}
327
328static int spi_sh_setup(struct spi_device *spi)
329{
330 struct spi_sh_data *ss = spi_controller_get_devdata(spi->controller);
331
332 pr_debug("%s: enter\n", __func__);
333
334 spi_sh_write(ss, 0xfe, SPI_SH_CR1); /* SPI sycle stop */
335 spi_sh_write(ss, 0x00, SPI_SH_CR1); /* CR1 init */
336 spi_sh_write(ss, 0x00, SPI_SH_CR3); /* CR3 init */
337
338 clear_fifo(ss);
339
340 /* 1/8 clock */
341 spi_sh_write(ss, spi_sh_read(ss, SPI_SH_CR2) | 0x07, SPI_SH_CR2);
342 udelay(10);
343
344 return 0;
345}
346
347static void spi_sh_cleanup(struct spi_device *spi)
348{
349 struct spi_sh_data *ss = spi_controller_get_devdata(spi->controller);
350
351 pr_debug("%s: enter\n", __func__);
352
353 spi_sh_clear_bit(ss, SPI_SH_SSA | SPI_SH_SSDB | SPI_SH_SSD,
354 SPI_SH_CR1);
355}
356
357static irqreturn_t spi_sh_irq(int irq, void *_ss)
358{
359 struct spi_sh_data *ss = (struct spi_sh_data *)_ss;
360 unsigned long cr1;
361
362 cr1 = spi_sh_read(ss, SPI_SH_CR1);
363 if (cr1 & SPI_SH_TBE)
364 ss->cr1 |= SPI_SH_TBE;
365 if (cr1 & SPI_SH_TBF)
366 ss->cr1 |= SPI_SH_TBF;
367 if (cr1 & SPI_SH_RBE)
368 ss->cr1 |= SPI_SH_RBE;
369 if (cr1 & SPI_SH_RBF)
370 ss->cr1 |= SPI_SH_RBF;
371
372 if (ss->cr1) {
373 spi_sh_clear_bit(ss, ss->cr1, SPI_SH_CR4);
374 wake_up(&ss->wait);
375 }
376
377 return IRQ_HANDLED;
378}
379
380static void spi_sh_remove(struct platform_device *pdev)
381{
382 struct spi_sh_data *ss = platform_get_drvdata(pdev);
383
384 spi_unregister_controller(ss->host);
385 free_irq(ss->irq, ss);
386}
387
388static int spi_sh_probe(struct platform_device *pdev)
389{
390 struct resource *res;
391 struct spi_controller *host;
392 struct spi_sh_data *ss;
393 int ret, irq;
394
395 /* get base addr */
396 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
397 if (unlikely(res == NULL)) {
398 dev_err(&pdev->dev, "invalid resource\n");
399 return -EINVAL;
400 }
401
402 irq = platform_get_irq(pdev, 0);
403 if (irq < 0)
404 return irq;
405
406 host = devm_spi_alloc_host(&pdev->dev, sizeof(struct spi_sh_data));
407 if (host == NULL) {
408 dev_err(&pdev->dev, "devm_spi_alloc_host error.\n");
409 return -ENOMEM;
410 }
411
412 ss = spi_controller_get_devdata(host);
413 platform_set_drvdata(pdev, ss);
414
415 switch (res->flags & IORESOURCE_MEM_TYPE_MASK) {
416 case IORESOURCE_MEM_8BIT:
417 ss->width = 8;
418 break;
419 case IORESOURCE_MEM_32BIT:
420 ss->width = 32;
421 break;
422 default:
423 dev_err(&pdev->dev, "No support width\n");
424 return -ENODEV;
425 }
426 ss->irq = irq;
427 ss->host = host;
428 ss->addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
429 if (ss->addr == NULL) {
430 dev_err(&pdev->dev, "ioremap error.\n");
431 return -ENOMEM;
432 }
433 init_waitqueue_head(&ss->wait);
434
435 ret = request_irq(irq, spi_sh_irq, 0, "spi_sh", ss);
436 if (ret < 0) {
437 dev_err(&pdev->dev, "request_irq error\n");
438 return ret;
439 }
440
441 host->num_chipselect = 2;
442 host->bus_num = pdev->id;
443 host->setup = spi_sh_setup;
444 host->transfer_one_message = spi_sh_transfer_one_message;
445 host->cleanup = spi_sh_cleanup;
446
447 ret = spi_register_controller(host);
448 if (ret < 0) {
449 printk(KERN_ERR "spi_register_controller error.\n");
450 goto error3;
451 }
452
453 return 0;
454
455 error3:
456 free_irq(irq, ss);
457 return ret;
458}
459
460static struct platform_driver spi_sh_driver = {
461 .probe = spi_sh_probe,
462 .remove_new = spi_sh_remove,
463 .driver = {
464 .name = "sh_spi",
465 },
466};
467module_platform_driver(spi_sh_driver);
468
469MODULE_DESCRIPTION("SH SPI bus driver");
470MODULE_LICENSE("GPL v2");
471MODULE_AUTHOR("Yoshihiro Shimoda");
472MODULE_ALIAS("platform:sh_spi");
1/*
2 * SH SPI bus driver
3 *
4 * Copyright (C) 2011 Renesas Solutions Corp.
5 *
6 * Based on pxa2xx_spi.c:
7 * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 *
22 */
23
24#include <linux/module.h>
25#include <linux/kernel.h>
26#include <linux/sched.h>
27#include <linux/errno.h>
28#include <linux/timer.h>
29#include <linux/delay.h>
30#include <linux/list.h>
31#include <linux/workqueue.h>
32#include <linux/interrupt.h>
33#include <linux/platform_device.h>
34#include <linux/io.h>
35#include <linux/spi/spi.h>
36
37#define SPI_SH_TBR 0x00
38#define SPI_SH_RBR 0x00
39#define SPI_SH_CR1 0x08
40#define SPI_SH_CR2 0x10
41#define SPI_SH_CR3 0x18
42#define SPI_SH_CR4 0x20
43#define SPI_SH_CR5 0x28
44
45/* CR1 */
46#define SPI_SH_TBE 0x80
47#define SPI_SH_TBF 0x40
48#define SPI_SH_RBE 0x20
49#define SPI_SH_RBF 0x10
50#define SPI_SH_PFONRD 0x08
51#define SPI_SH_SSDB 0x04
52#define SPI_SH_SSD 0x02
53#define SPI_SH_SSA 0x01
54
55/* CR2 */
56#define SPI_SH_RSTF 0x80
57#define SPI_SH_LOOPBK 0x40
58#define SPI_SH_CPOL 0x20
59#define SPI_SH_CPHA 0x10
60#define SPI_SH_L1M0 0x08
61
62/* CR3 */
63#define SPI_SH_MAX_BYTE 0xFF
64
65/* CR4 */
66#define SPI_SH_TBEI 0x80
67#define SPI_SH_TBFI 0x40
68#define SPI_SH_RBEI 0x20
69#define SPI_SH_RBFI 0x10
70#define SPI_SH_WPABRT 0x04
71#define SPI_SH_SSS 0x01
72
73/* CR8 */
74#define SPI_SH_P1L0 0x80
75#define SPI_SH_PP1L0 0x40
76#define SPI_SH_MUXI 0x20
77#define SPI_SH_MUXIRQ 0x10
78
79#define SPI_SH_FIFO_SIZE 32
80#define SPI_SH_SEND_TIMEOUT (3 * HZ)
81#define SPI_SH_RECEIVE_TIMEOUT (HZ >> 3)
82
83#undef DEBUG
84
85struct spi_sh_data {
86 void __iomem *addr;
87 int irq;
88 struct spi_master *master;
89 struct list_head queue;
90 struct workqueue_struct *workqueue;
91 struct work_struct ws;
92 unsigned long cr1;
93 wait_queue_head_t wait;
94 spinlock_t lock;
95 int width;
96};
97
98static void spi_sh_write(struct spi_sh_data *ss, unsigned long data,
99 unsigned long offset)
100{
101 if (ss->width == 8)
102 iowrite8(data, ss->addr + (offset >> 2));
103 else if (ss->width == 32)
104 iowrite32(data, ss->addr + offset);
105}
106
107static unsigned long spi_sh_read(struct spi_sh_data *ss, unsigned long offset)
108{
109 if (ss->width == 8)
110 return ioread8(ss->addr + (offset >> 2));
111 else if (ss->width == 32)
112 return ioread32(ss->addr + offset);
113 else
114 return 0;
115}
116
117static void spi_sh_set_bit(struct spi_sh_data *ss, unsigned long val,
118 unsigned long offset)
119{
120 unsigned long tmp;
121
122 tmp = spi_sh_read(ss, offset);
123 tmp |= val;
124 spi_sh_write(ss, tmp, offset);
125}
126
127static void spi_sh_clear_bit(struct spi_sh_data *ss, unsigned long val,
128 unsigned long offset)
129{
130 unsigned long tmp;
131
132 tmp = spi_sh_read(ss, offset);
133 tmp &= ~val;
134 spi_sh_write(ss, tmp, offset);
135}
136
137static void clear_fifo(struct spi_sh_data *ss)
138{
139 spi_sh_set_bit(ss, SPI_SH_RSTF, SPI_SH_CR2);
140 spi_sh_clear_bit(ss, SPI_SH_RSTF, SPI_SH_CR2);
141}
142
143static int spi_sh_wait_receive_buffer(struct spi_sh_data *ss)
144{
145 int timeout = 100000;
146
147 while (spi_sh_read(ss, SPI_SH_CR1) & SPI_SH_RBE) {
148 udelay(10);
149 if (timeout-- < 0)
150 return -ETIMEDOUT;
151 }
152 return 0;
153}
154
155static int spi_sh_wait_write_buffer_empty(struct spi_sh_data *ss)
156{
157 int timeout = 100000;
158
159 while (!(spi_sh_read(ss, SPI_SH_CR1) & SPI_SH_TBE)) {
160 udelay(10);
161 if (timeout-- < 0)
162 return -ETIMEDOUT;
163 }
164 return 0;
165}
166
167static int spi_sh_send(struct spi_sh_data *ss, struct spi_message *mesg,
168 struct spi_transfer *t)
169{
170 int i, retval = 0;
171 int remain = t->len;
172 int cur_len;
173 unsigned char *data;
174 long ret;
175
176 if (t->len)
177 spi_sh_set_bit(ss, SPI_SH_SSA, SPI_SH_CR1);
178
179 data = (unsigned char *)t->tx_buf;
180 while (remain > 0) {
181 cur_len = min(SPI_SH_FIFO_SIZE, remain);
182 for (i = 0; i < cur_len &&
183 !(spi_sh_read(ss, SPI_SH_CR4) &
184 SPI_SH_WPABRT) &&
185 !(spi_sh_read(ss, SPI_SH_CR1) & SPI_SH_TBF);
186 i++)
187 spi_sh_write(ss, (unsigned long)data[i], SPI_SH_TBR);
188
189 if (spi_sh_read(ss, SPI_SH_CR4) & SPI_SH_WPABRT) {
190 /* Abort SPI operation */
191 spi_sh_set_bit(ss, SPI_SH_WPABRT, SPI_SH_CR4);
192 retval = -EIO;
193 break;
194 }
195
196 cur_len = i;
197
198 remain -= cur_len;
199 data += cur_len;
200
201 if (remain > 0) {
202 ss->cr1 &= ~SPI_SH_TBE;
203 spi_sh_set_bit(ss, SPI_SH_TBE, SPI_SH_CR4);
204 ret = wait_event_interruptible_timeout(ss->wait,
205 ss->cr1 & SPI_SH_TBE,
206 SPI_SH_SEND_TIMEOUT);
207 if (ret == 0 && !(ss->cr1 & SPI_SH_TBE)) {
208 printk(KERN_ERR "%s: timeout\n", __func__);
209 return -ETIMEDOUT;
210 }
211 }
212 }
213
214 if (list_is_last(&t->transfer_list, &mesg->transfers)) {
215 spi_sh_clear_bit(ss, SPI_SH_SSD | SPI_SH_SSDB, SPI_SH_CR1);
216 spi_sh_set_bit(ss, SPI_SH_SSA, SPI_SH_CR1);
217
218 ss->cr1 &= ~SPI_SH_TBE;
219 spi_sh_set_bit(ss, SPI_SH_TBE, SPI_SH_CR4);
220 ret = wait_event_interruptible_timeout(ss->wait,
221 ss->cr1 & SPI_SH_TBE,
222 SPI_SH_SEND_TIMEOUT);
223 if (ret == 0 && (ss->cr1 & SPI_SH_TBE)) {
224 printk(KERN_ERR "%s: timeout\n", __func__);
225 return -ETIMEDOUT;
226 }
227 }
228
229 return retval;
230}
231
232static int spi_sh_receive(struct spi_sh_data *ss, struct spi_message *mesg,
233 struct spi_transfer *t)
234{
235 int i;
236 int remain = t->len;
237 int cur_len;
238 unsigned char *data;
239 long ret;
240
241 if (t->len > SPI_SH_MAX_BYTE)
242 spi_sh_write(ss, SPI_SH_MAX_BYTE, SPI_SH_CR3);
243 else
244 spi_sh_write(ss, t->len, SPI_SH_CR3);
245
246 spi_sh_clear_bit(ss, SPI_SH_SSD | SPI_SH_SSDB, SPI_SH_CR1);
247 spi_sh_set_bit(ss, SPI_SH_SSA, SPI_SH_CR1);
248
249 spi_sh_wait_write_buffer_empty(ss);
250
251 data = (unsigned char *)t->rx_buf;
252 while (remain > 0) {
253 if (remain >= SPI_SH_FIFO_SIZE) {
254 ss->cr1 &= ~SPI_SH_RBF;
255 spi_sh_set_bit(ss, SPI_SH_RBF, SPI_SH_CR4);
256 ret = wait_event_interruptible_timeout(ss->wait,
257 ss->cr1 & SPI_SH_RBF,
258 SPI_SH_RECEIVE_TIMEOUT);
259 if (ret == 0 &&
260 spi_sh_read(ss, SPI_SH_CR1) & SPI_SH_RBE) {
261 printk(KERN_ERR "%s: timeout\n", __func__);
262 return -ETIMEDOUT;
263 }
264 }
265
266 cur_len = min(SPI_SH_FIFO_SIZE, remain);
267 for (i = 0; i < cur_len; i++) {
268 if (spi_sh_wait_receive_buffer(ss))
269 break;
270 data[i] = (unsigned char)spi_sh_read(ss, SPI_SH_RBR);
271 }
272
273 remain -= cur_len;
274 data += cur_len;
275 }
276
277 /* deassert CS when SPI is receiving. */
278 if (t->len > SPI_SH_MAX_BYTE) {
279 clear_fifo(ss);
280 spi_sh_write(ss, 1, SPI_SH_CR3);
281 } else {
282 spi_sh_write(ss, 0, SPI_SH_CR3);
283 }
284
285 return 0;
286}
287
288static void spi_sh_work(struct work_struct *work)
289{
290 struct spi_sh_data *ss = container_of(work, struct spi_sh_data, ws);
291 struct spi_message *mesg;
292 struct spi_transfer *t;
293 unsigned long flags;
294 int ret;
295
296 pr_debug("%s: enter\n", __func__);
297
298 spin_lock_irqsave(&ss->lock, flags);
299 while (!list_empty(&ss->queue)) {
300 mesg = list_entry(ss->queue.next, struct spi_message, queue);
301 list_del_init(&mesg->queue);
302
303 spin_unlock_irqrestore(&ss->lock, flags);
304 list_for_each_entry(t, &mesg->transfers, transfer_list) {
305 pr_debug("tx_buf = %p, rx_buf = %p\n",
306 t->tx_buf, t->rx_buf);
307 pr_debug("len = %d, delay_usecs = %d\n",
308 t->len, t->delay_usecs);
309
310 if (t->tx_buf) {
311 ret = spi_sh_send(ss, mesg, t);
312 if (ret < 0)
313 goto error;
314 }
315 if (t->rx_buf) {
316 ret = spi_sh_receive(ss, mesg, t);
317 if (ret < 0)
318 goto error;
319 }
320 mesg->actual_length += t->len;
321 }
322 spin_lock_irqsave(&ss->lock, flags);
323
324 mesg->status = 0;
325 if (mesg->complete)
326 mesg->complete(mesg->context);
327 }
328
329 clear_fifo(ss);
330 spi_sh_set_bit(ss, SPI_SH_SSD, SPI_SH_CR1);
331 udelay(100);
332
333 spi_sh_clear_bit(ss, SPI_SH_SSA | SPI_SH_SSDB | SPI_SH_SSD,
334 SPI_SH_CR1);
335
336 clear_fifo(ss);
337
338 spin_unlock_irqrestore(&ss->lock, flags);
339
340 return;
341
342 error:
343 mesg->status = ret;
344 if (mesg->complete)
345 mesg->complete(mesg->context);
346
347 spi_sh_clear_bit(ss, SPI_SH_SSA | SPI_SH_SSDB | SPI_SH_SSD,
348 SPI_SH_CR1);
349 clear_fifo(ss);
350
351}
352
353static int spi_sh_setup(struct spi_device *spi)
354{
355 struct spi_sh_data *ss = spi_master_get_devdata(spi->master);
356
357 pr_debug("%s: enter\n", __func__);
358
359 spi_sh_write(ss, 0xfe, SPI_SH_CR1); /* SPI sycle stop */
360 spi_sh_write(ss, 0x00, SPI_SH_CR1); /* CR1 init */
361 spi_sh_write(ss, 0x00, SPI_SH_CR3); /* CR3 init */
362
363 clear_fifo(ss);
364
365 /* 1/8 clock */
366 spi_sh_write(ss, spi_sh_read(ss, SPI_SH_CR2) | 0x07, SPI_SH_CR2);
367 udelay(10);
368
369 return 0;
370}
371
372static int spi_sh_transfer(struct spi_device *spi, struct spi_message *mesg)
373{
374 struct spi_sh_data *ss = spi_master_get_devdata(spi->master);
375 unsigned long flags;
376
377 pr_debug("%s: enter\n", __func__);
378 pr_debug("\tmode = %02x\n", spi->mode);
379
380 spin_lock_irqsave(&ss->lock, flags);
381
382 mesg->actual_length = 0;
383 mesg->status = -EINPROGRESS;
384
385 spi_sh_clear_bit(ss, SPI_SH_SSA, SPI_SH_CR1);
386
387 list_add_tail(&mesg->queue, &ss->queue);
388 queue_work(ss->workqueue, &ss->ws);
389
390 spin_unlock_irqrestore(&ss->lock, flags);
391
392 return 0;
393}
394
395static void spi_sh_cleanup(struct spi_device *spi)
396{
397 struct spi_sh_data *ss = spi_master_get_devdata(spi->master);
398
399 pr_debug("%s: enter\n", __func__);
400
401 spi_sh_clear_bit(ss, SPI_SH_SSA | SPI_SH_SSDB | SPI_SH_SSD,
402 SPI_SH_CR1);
403}
404
405static irqreturn_t spi_sh_irq(int irq, void *_ss)
406{
407 struct spi_sh_data *ss = (struct spi_sh_data *)_ss;
408 unsigned long cr1;
409
410 cr1 = spi_sh_read(ss, SPI_SH_CR1);
411 if (cr1 & SPI_SH_TBE)
412 ss->cr1 |= SPI_SH_TBE;
413 if (cr1 & SPI_SH_TBF)
414 ss->cr1 |= SPI_SH_TBF;
415 if (cr1 & SPI_SH_RBE)
416 ss->cr1 |= SPI_SH_RBE;
417 if (cr1 & SPI_SH_RBF)
418 ss->cr1 |= SPI_SH_RBF;
419
420 if (ss->cr1) {
421 spi_sh_clear_bit(ss, ss->cr1, SPI_SH_CR4);
422 wake_up(&ss->wait);
423 }
424
425 return IRQ_HANDLED;
426}
427
428static int spi_sh_remove(struct platform_device *pdev)
429{
430 struct spi_sh_data *ss = platform_get_drvdata(pdev);
431
432 spi_unregister_master(ss->master);
433 destroy_workqueue(ss->workqueue);
434 free_irq(ss->irq, ss);
435 iounmap(ss->addr);
436
437 return 0;
438}
439
440static int spi_sh_probe(struct platform_device *pdev)
441{
442 struct resource *res;
443 struct spi_master *master;
444 struct spi_sh_data *ss;
445 int ret, irq;
446
447 /* get base addr */
448 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
449 if (unlikely(res == NULL)) {
450 dev_err(&pdev->dev, "invalid resource\n");
451 return -EINVAL;
452 }
453
454 irq = platform_get_irq(pdev, 0);
455 if (irq < 0) {
456 dev_err(&pdev->dev, "platform_get_irq error\n");
457 return -ENODEV;
458 }
459
460 master = spi_alloc_master(&pdev->dev, sizeof(struct spi_sh_data));
461 if (master == NULL) {
462 dev_err(&pdev->dev, "spi_alloc_master error.\n");
463 return -ENOMEM;
464 }
465
466 ss = spi_master_get_devdata(master);
467 platform_set_drvdata(pdev, ss);
468
469 switch (res->flags & IORESOURCE_MEM_TYPE_MASK) {
470 case IORESOURCE_MEM_8BIT:
471 ss->width = 8;
472 break;
473 case IORESOURCE_MEM_32BIT:
474 ss->width = 32;
475 break;
476 default:
477 dev_err(&pdev->dev, "No support width\n");
478 ret = -ENODEV;
479 goto error1;
480 }
481 ss->irq = irq;
482 ss->master = master;
483 ss->addr = ioremap(res->start, resource_size(res));
484 if (ss->addr == NULL) {
485 dev_err(&pdev->dev, "ioremap error.\n");
486 ret = -ENOMEM;
487 goto error1;
488 }
489 INIT_LIST_HEAD(&ss->queue);
490 spin_lock_init(&ss->lock);
491 INIT_WORK(&ss->ws, spi_sh_work);
492 init_waitqueue_head(&ss->wait);
493 ss->workqueue = create_singlethread_workqueue(
494 dev_name(master->dev.parent));
495 if (ss->workqueue == NULL) {
496 dev_err(&pdev->dev, "create workqueue error\n");
497 ret = -EBUSY;
498 goto error2;
499 }
500
501 ret = request_irq(irq, spi_sh_irq, 0, "spi_sh", ss);
502 if (ret < 0) {
503 dev_err(&pdev->dev, "request_irq error\n");
504 goto error3;
505 }
506
507 master->num_chipselect = 2;
508 master->bus_num = pdev->id;
509 master->setup = spi_sh_setup;
510 master->transfer = spi_sh_transfer;
511 master->cleanup = spi_sh_cleanup;
512
513 ret = spi_register_master(master);
514 if (ret < 0) {
515 printk(KERN_ERR "spi_register_master error.\n");
516 goto error4;
517 }
518
519 return 0;
520
521 error4:
522 free_irq(irq, ss);
523 error3:
524 destroy_workqueue(ss->workqueue);
525 error2:
526 iounmap(ss->addr);
527 error1:
528 spi_master_put(master);
529
530 return ret;
531}
532
533static struct platform_driver spi_sh_driver = {
534 .probe = spi_sh_probe,
535 .remove = spi_sh_remove,
536 .driver = {
537 .name = "sh_spi",
538 .owner = THIS_MODULE,
539 },
540};
541module_platform_driver(spi_sh_driver);
542
543MODULE_DESCRIPTION("SH SPI bus driver");
544MODULE_LICENSE("GPL");
545MODULE_AUTHOR("Yoshihiro Shimoda");
546MODULE_ALIAS("platform:sh_spi");