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net/irda: bfin_sir: pull in serial headers for defines
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / spi / omap2_mcspi.c
blobabb1ffbf3d2019154855c29028418c0f3e85beae
1 /*
2 * OMAP2 McSPI controller driver
3 *
4 * Copyright (C) 2005, 2006 Nokia Corporation
5 * Author: Samuel Ortiz <samuel.ortiz@nokia.com> and
6 * Juha Yrjölä <juha.yrjola@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24 #include <linux/kernel.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/module.h>
28 #include <linux/device.h>
29 #include <linux/delay.h>
30 #include <linux/dma-mapping.h>
31 #include <linux/platform_device.h>
32 #include <linux/err.h>
33 #include <linux/clk.h>
34 #include <linux/io.h>
35 #include <linux/slab.h>
36
37 #include <linux/spi/spi.h>
38
39 #include <plat/dma.h>
40 #include <plat/clock.h>
41 #include <plat/mcspi.h>
42
43 #define OMAP2_MCSPI_MAX_FREQ 48000000
44
45 /* OMAP2 has 3 SPI controllers, while OMAP3 has 4 */
46 #define OMAP2_MCSPI_MAX_CTRL 4
47
48 #define OMAP2_MCSPI_REVISION 0x00
49 #define OMAP2_MCSPI_SYSCONFIG 0x10
50 #define OMAP2_MCSPI_SYSSTATUS 0x14
51 #define OMAP2_MCSPI_IRQSTATUS 0x18
52 #define OMAP2_MCSPI_IRQENABLE 0x1c
53 #define OMAP2_MCSPI_WAKEUPENABLE 0x20
54 #define OMAP2_MCSPI_SYST 0x24
55 #define OMAP2_MCSPI_MODULCTRL 0x28
56
57 /* per-channel banks, 0x14 bytes each, first is: */
58 #define OMAP2_MCSPI_CHCONF0 0x2c
59 #define OMAP2_MCSPI_CHSTAT0 0x30
60 #define OMAP2_MCSPI_CHCTRL0 0x34
61 #define OMAP2_MCSPI_TX0 0x38
62 #define OMAP2_MCSPI_RX0 0x3c
63
64 /* per-register bitmasks: */
65
66 #define OMAP2_MCSPI_SYSCONFIG_SMARTIDLE BIT(4)
67 #define OMAP2_MCSPI_SYSCONFIG_ENAWAKEUP BIT(2)
68 #define OMAP2_MCSPI_SYSCONFIG_AUTOIDLE BIT(0)
69 #define OMAP2_MCSPI_SYSCONFIG_SOFTRESET BIT(1)
70
71 #define OMAP2_MCSPI_SYSSTATUS_RESETDONE BIT(0)
72
73 #define OMAP2_MCSPI_MODULCTRL_SINGLE BIT(0)
74 #define OMAP2_MCSPI_MODULCTRL_MS BIT(2)
75 #define OMAP2_MCSPI_MODULCTRL_STEST BIT(3)
76
77 #define OMAP2_MCSPI_CHCONF_PHA BIT(0)
78 #define OMAP2_MCSPI_CHCONF_POL BIT(1)
79 #define OMAP2_MCSPI_CHCONF_CLKD_MASK (0x0f << 2)
80 #define OMAP2_MCSPI_CHCONF_EPOL BIT(6)
81 #define OMAP2_MCSPI_CHCONF_WL_MASK (0x1f << 7)
82 #define OMAP2_MCSPI_CHCONF_TRM_RX_ONLY BIT(12)
83 #define OMAP2_MCSPI_CHCONF_TRM_TX_ONLY BIT(13)
84 #define OMAP2_MCSPI_CHCONF_TRM_MASK (0x03 << 12)
85 #define OMAP2_MCSPI_CHCONF_DMAW BIT(14)
86 #define OMAP2_MCSPI_CHCONF_DMAR BIT(15)
87 #define OMAP2_MCSPI_CHCONF_DPE0 BIT(16)
88 #define OMAP2_MCSPI_CHCONF_DPE1 BIT(17)
89 #define OMAP2_MCSPI_CHCONF_IS BIT(18)
90 #define OMAP2_MCSPI_CHCONF_TURBO BIT(19)
91 #define OMAP2_MCSPI_CHCONF_FORCE BIT(20)
92
93 #define OMAP2_MCSPI_CHSTAT_RXS BIT(0)
94 #define OMAP2_MCSPI_CHSTAT_TXS BIT(1)
95 #define OMAP2_MCSPI_CHSTAT_EOT BIT(2)
96
97 #define OMAP2_MCSPI_CHCTRL_EN BIT(0)
98
99 #define OMAP2_MCSPI_WAKEUPENABLE_WKEN BIT(0)
100
101 /* We have 2 DMA channels per CS, one for RX and one for TX */
102 struct omap2_mcspi_dma {
103 int dma_tx_channel;
104 int dma_rx_channel;
105
106 int dma_tx_sync_dev;
107 int dma_rx_sync_dev;
108
109 struct completion dma_tx_completion;
110 struct completion dma_rx_completion;
111 };
112
113 /* use PIO for small transfers, avoiding DMA setup/teardown overhead and
114 * cache operations; better heuristics consider wordsize and bitrate.
115 */
116 #define DMA_MIN_BYTES 160
117
118
119 struct omap2_mcspi {
120 struct work_struct work;
121 /* lock protects queue and registers */
122 spinlock_t lock;
123 struct list_head msg_queue;
124 struct spi_master *master;
125 struct clk *ick;
126 struct clk *fck;
127 /* Virtual base address of the controller */
128 void __iomem *base;
129 unsigned long phys;
130 /* SPI1 has 4 channels, while SPI2 has 2 */
131 struct omap2_mcspi_dma *dma_channels;
132 };
133
134 struct omap2_mcspi_cs {
135 void __iomem *base;
136 unsigned long phys;
137 int word_len;
138 struct list_head node;
139 /* Context save and restore shadow register */
140 u32 chconf0;
141 };
142
143 /* used for context save and restore, structure members to be updated whenever
144 * corresponding registers are modified.
145 */
146 struct omap2_mcspi_regs {
147 u32 sysconfig;
148 u32 modulctrl;
149 u32 wakeupenable;
150 struct list_head cs;
151 };
152
153 static struct omap2_mcspi_regs omap2_mcspi_ctx[OMAP2_MCSPI_MAX_CTRL];
154
155 static struct workqueue_struct *omap2_mcspi_wq;
156
157 #define MOD_REG_BIT(val, mask, set) do { \
158 if (set) \
159 val |= mask; \
160 else \
161 val &= ~mask; \
162 } while (0)
163
164 static inline void mcspi_write_reg(struct spi_master *master,
165 int idx, u32 val)
166 {
167 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
168
169 __raw_writel(val, mcspi->base + idx);
170 }
171
172 static inline u32 mcspi_read_reg(struct spi_master *master, int idx)
173 {
174 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
175
176 return __raw_readl(mcspi->base + idx);
177 }
178
179 static inline void mcspi_write_cs_reg(const struct spi_device *spi,
180 int idx, u32 val)
181 {
182 struct omap2_mcspi_cs *cs = spi->controller_state;
183
184 __raw_writel(val, cs->base + idx);
185 }
186
187 static inline u32 mcspi_read_cs_reg(const struct spi_device *spi, int idx)
188 {
189 struct omap2_mcspi_cs *cs = spi->controller_state;
190
191 return __raw_readl(cs->base + idx);
192 }
193
194 static inline u32 mcspi_cached_chconf0(const struct spi_device *spi)
195 {
196 struct omap2_mcspi_cs *cs = spi->controller_state;
197
198 return cs->chconf0;
199 }
200
201 static inline void mcspi_write_chconf0(const struct spi_device *spi, u32 val)
202 {
203 struct omap2_mcspi_cs *cs = spi->controller_state;
204
205 cs->chconf0 = val;
206 mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, val);
207 mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0);
208 }
209
210 static void omap2_mcspi_set_dma_req(const struct spi_device *spi,
211 int is_read, int enable)
212 {
213 u32 l, rw;
214
215 l = mcspi_cached_chconf0(spi);
216
217 if (is_read) /* 1 is read, 0 write */
218 rw = OMAP2_MCSPI_CHCONF_DMAR;
219 else
220 rw = OMAP2_MCSPI_CHCONF_DMAW;
221
222 MOD_REG_BIT(l, rw, enable);
223 mcspi_write_chconf0(spi, l);
224 }
225
226 static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable)
227 {
228 u32 l;
229
230 l = enable ? OMAP2_MCSPI_CHCTRL_EN : 0;
231 mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, l);
232 /* Flash post-writes */
233 mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0);
234 }
235
236 static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active)
237 {
238 u32 l;
239
240 l = mcspi_cached_chconf0(spi);
241 MOD_REG_BIT(l, OMAP2_MCSPI_CHCONF_FORCE, cs_active);
242 mcspi_write_chconf0(spi, l);
243 }
244
245 static void omap2_mcspi_set_master_mode(struct spi_master *master)
246 {
247 u32 l;
248
249 /* setup when switching from (reset default) slave mode
250 * to single-channel master mode
251 */
252 l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL);
253 MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_STEST, 0);
254 MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_MS, 0);
255 MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_SINGLE, 1);
256 mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l);
257
258 omap2_mcspi_ctx[master->bus_num - 1].modulctrl = l;
259 }
260
261 static void omap2_mcspi_restore_ctx(struct omap2_mcspi *mcspi)
262 {
263 struct spi_master *spi_cntrl;
264 struct omap2_mcspi_cs *cs;
265 spi_cntrl = mcspi->master;
266
267 /* McSPI: context restore */
268 mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_MODULCTRL,
269 omap2_mcspi_ctx[spi_cntrl->bus_num - 1].modulctrl);
270
271 mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_SYSCONFIG,
272 omap2_mcspi_ctx[spi_cntrl->bus_num - 1].sysconfig);
273
274 mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_WAKEUPENABLE,
275 omap2_mcspi_ctx[spi_cntrl->bus_num - 1].wakeupenable);
276
277 list_for_each_entry(cs, &omap2_mcspi_ctx[spi_cntrl->bus_num - 1].cs,
278 node)
279 __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
280 }
281 static void omap2_mcspi_disable_clocks(struct omap2_mcspi *mcspi)
282 {
283 clk_disable(mcspi->ick);
284 clk_disable(mcspi->fck);
285 }
286
287 static int omap2_mcspi_enable_clocks(struct omap2_mcspi *mcspi)
288 {
289 if (clk_enable(mcspi->ick))
290 return -ENODEV;
291 if (clk_enable(mcspi->fck))
292 return -ENODEV;
293
294 omap2_mcspi_restore_ctx(mcspi);
295
296 return 0;
297 }
298
299 static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit)
300 {
301 unsigned long timeout;
302
303 timeout = jiffies + msecs_to_jiffies(1000);
304 while (!(__raw_readl(reg) & bit)) {
305 if (time_after(jiffies, timeout))
306 return -1;
307 cpu_relax();
308 }
309 return 0;
310 }
311
312 static unsigned
313 omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
314 {
315 struct omap2_mcspi *mcspi;
316 struct omap2_mcspi_cs *cs = spi->controller_state;
317 struct omap2_mcspi_dma *mcspi_dma;
318 unsigned int count, c;
319 unsigned long base, tx_reg, rx_reg;
320 int word_len, data_type, element_count;
321 int elements;
322 u32 l;
323 u8 * rx;
324 const u8 * tx;
325 void __iomem *chstat_reg;
326
327 mcspi = spi_master_get_devdata(spi->master);
328 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
329 l = mcspi_cached_chconf0(spi);
330
331 chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0;
332
333 count = xfer->len;
334 c = count;
335 word_len = cs->word_len;
336
337 base = cs->phys;
338 tx_reg = base + OMAP2_MCSPI_TX0;
339 rx_reg = base + OMAP2_MCSPI_RX0;
340 rx = xfer->rx_buf;
341 tx = xfer->tx_buf;
342
343 if (word_len <= 8) {
344 data_type = OMAP_DMA_DATA_TYPE_S8;
345 element_count = count;
346 } else if (word_len <= 16) {
347 data_type = OMAP_DMA_DATA_TYPE_S16;
348 element_count = count >> 1;
349 } else /* word_len <= 32 */ {
350 data_type = OMAP_DMA_DATA_TYPE_S32;
351 element_count = count >> 2;
352 }
353
354 if (tx != NULL) {
355 omap_set_dma_transfer_params(mcspi_dma->dma_tx_channel,
356 data_type, element_count, 1,
357 OMAP_DMA_SYNC_ELEMENT,
358 mcspi_dma->dma_tx_sync_dev, 0);
359
360 omap_set_dma_dest_params(mcspi_dma->dma_tx_channel, 0,
361 OMAP_DMA_AMODE_CONSTANT,
362 tx_reg, 0, 0);
363
364 omap_set_dma_src_params(mcspi_dma->dma_tx_channel, 0,
365 OMAP_DMA_AMODE_POST_INC,
366 xfer->tx_dma, 0, 0);
367 }
368
369 if (rx != NULL) {
370 elements = element_count - 1;
371 if (l & OMAP2_MCSPI_CHCONF_TURBO)
372 elements--;
373
374 omap_set_dma_transfer_params(mcspi_dma->dma_rx_channel,
375 data_type, elements, 1,
376 OMAP_DMA_SYNC_ELEMENT,
377 mcspi_dma->dma_rx_sync_dev, 1);
378
379 omap_set_dma_src_params(mcspi_dma->dma_rx_channel, 0,
380 OMAP_DMA_AMODE_CONSTANT,
381 rx_reg, 0, 0);
382
383 omap_set_dma_dest_params(mcspi_dma->dma_rx_channel, 0,
384 OMAP_DMA_AMODE_POST_INC,
385 xfer->rx_dma, 0, 0);
386 }
387
388 if (tx != NULL) {
389 omap_start_dma(mcspi_dma->dma_tx_channel);
390 omap2_mcspi_set_dma_req(spi, 0, 1);
391 }
392
393 if (rx != NULL) {
394 omap_start_dma(mcspi_dma->dma_rx_channel);
395 omap2_mcspi_set_dma_req(spi, 1, 1);
396 }
397
398 if (tx != NULL) {
399 wait_for_completion(&mcspi_dma->dma_tx_completion);
400 dma_unmap_single(&spi->dev, xfer->tx_dma, count, DMA_TO_DEVICE);
401
402 /* for TX_ONLY mode, be sure all words have shifted out */
403 if (rx == NULL) {
404 if (mcspi_wait_for_reg_bit(chstat_reg,
405 OMAP2_MCSPI_CHSTAT_TXS) < 0)
406 dev_err(&spi->dev, "TXS timed out\n");
407 else if (mcspi_wait_for_reg_bit(chstat_reg,
408 OMAP2_MCSPI_CHSTAT_EOT) < 0)
409 dev_err(&spi->dev, "EOT timed out\n");
410 }
411 }
412
413 if (rx != NULL) {
414 wait_for_completion(&mcspi_dma->dma_rx_completion);
415 dma_unmap_single(&spi->dev, xfer->rx_dma, count, DMA_FROM_DEVICE);
416 omap2_mcspi_set_enable(spi, 0);
417
418 if (l & OMAP2_MCSPI_CHCONF_TURBO) {
419
420 if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
421 & OMAP2_MCSPI_CHSTAT_RXS)) {
422 u32 w;
423
424 w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
425 if (word_len <= 8)
426 ((u8 *)xfer->rx_buf)[elements++] = w;
427 else if (word_len <= 16)
428 ((u16 *)xfer->rx_buf)[elements++] = w;
429 else /* word_len <= 32 */
430 ((u32 *)xfer->rx_buf)[elements++] = w;
431 } else {
432 dev_err(&spi->dev,
433 "DMA RX penultimate word empty");
434 count -= (word_len <= 8) ? 2 :
435 (word_len <= 16) ? 4 :
436 /* word_len <= 32 */ 8;
437 omap2_mcspi_set_enable(spi, 1);
438 return count;
439 }
440 }
441
442 if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
443 & OMAP2_MCSPI_CHSTAT_RXS)) {
444 u32 w;
445
446 w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
447 if (word_len <= 8)
448 ((u8 *)xfer->rx_buf)[elements] = w;
449 else if (word_len <= 16)
450 ((u16 *)xfer->rx_buf)[elements] = w;
451 else /* word_len <= 32 */
452 ((u32 *)xfer->rx_buf)[elements] = w;
453 } else {
454 dev_err(&spi->dev, "DMA RX last word empty");
455 count -= (word_len <= 8) ? 1 :
456 (word_len <= 16) ? 2 :
457 /* word_len <= 32 */ 4;
458 }
459 omap2_mcspi_set_enable(spi, 1);
460 }
461 return count;
462 }
463
464 static unsigned
465 omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
466 {
467 struct omap2_mcspi *mcspi;
468 struct omap2_mcspi_cs *cs = spi->controller_state;
469 unsigned int count, c;
470 u32 l;
471 void __iomem *base = cs->base;
472 void __iomem *tx_reg;
473 void __iomem *rx_reg;
474 void __iomem *chstat_reg;
475 int word_len;
476
477 mcspi = spi_master_get_devdata(spi->master);
478 count = xfer->len;
479 c = count;
480 word_len = cs->word_len;
481
482 l = mcspi_cached_chconf0(spi);
483
484 /* We store the pre-calculated register addresses on stack to speed
485 * up the transfer loop. */
486 tx_reg = base + OMAP2_MCSPI_TX0;
487 rx_reg = base + OMAP2_MCSPI_RX0;
488 chstat_reg = base + OMAP2_MCSPI_CHSTAT0;
489
490 if (word_len <= 8) {
491 u8 *rx;
492 const u8 *tx;
493
494 rx = xfer->rx_buf;
495 tx = xfer->tx_buf;
496
497 do {
498 c -= 1;
499 if (tx != NULL) {
500 if (mcspi_wait_for_reg_bit(chstat_reg,
501 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
502 dev_err(&spi->dev, "TXS timed out\n");
503 goto out;
504 }
505 dev_vdbg(&spi->dev, "write-%d %02x\n",
506 word_len, *tx);
507 __raw_writel(*tx++, tx_reg);
508 }
509 if (rx != NULL) {
510 if (mcspi_wait_for_reg_bit(chstat_reg,
511 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
512 dev_err(&spi->dev, "RXS timed out\n");
513 goto out;
514 }
515
516 if (c == 1 && tx == NULL &&
517 (l & OMAP2_MCSPI_CHCONF_TURBO)) {
518 omap2_mcspi_set_enable(spi, 0);
519 *rx++ = __raw_readl(rx_reg);
520 dev_vdbg(&spi->dev, "read-%d %02x\n",
521 word_len, *(rx - 1));
522 if (mcspi_wait_for_reg_bit(chstat_reg,
523 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
524 dev_err(&spi->dev,
525 "RXS timed out\n");
526 goto out;
527 }
528 c = 0;
529 } else if (c == 0 && tx == NULL) {
530 omap2_mcspi_set_enable(spi, 0);
531 }
532
533 *rx++ = __raw_readl(rx_reg);
534 dev_vdbg(&spi->dev, "read-%d %02x\n",
535 word_len, *(rx - 1));
536 }
537 } while (c);
538 } else if (word_len <= 16) {
539 u16 *rx;
540 const u16 *tx;
541
542 rx = xfer->rx_buf;
543 tx = xfer->tx_buf;
544 do {
545 c -= 2;
546 if (tx != NULL) {
547 if (mcspi_wait_for_reg_bit(chstat_reg,
548 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
549 dev_err(&spi->dev, "TXS timed out\n");
550 goto out;
551 }
552 dev_vdbg(&spi->dev, "write-%d %04x\n",
553 word_len, *tx);
554 __raw_writel(*tx++, tx_reg);
555 }
556 if (rx != NULL) {
557 if (mcspi_wait_for_reg_bit(chstat_reg,
558 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
559 dev_err(&spi->dev, "RXS timed out\n");
560 goto out;
561 }
562
563 if (c == 2 && tx == NULL &&
564 (l & OMAP2_MCSPI_CHCONF_TURBO)) {
565 omap2_mcspi_set_enable(spi, 0);
566 *rx++ = __raw_readl(rx_reg);
567 dev_vdbg(&spi->dev, "read-%d %04x\n",
568 word_len, *(rx - 1));
569 if (mcspi_wait_for_reg_bit(chstat_reg,
570 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
571 dev_err(&spi->dev,
572 "RXS timed out\n");
573 goto out;
574 }
575 c = 0;
576 } else if (c == 0 && tx == NULL) {
577 omap2_mcspi_set_enable(spi, 0);
578 }
579
580 *rx++ = __raw_readl(rx_reg);
581 dev_vdbg(&spi->dev, "read-%d %04x\n",
582 word_len, *(rx - 1));
583 }
584 } while (c);
585 } else if (word_len <= 32) {
586 u32 *rx;
587 const u32 *tx;
588
589 rx = xfer->rx_buf;
590 tx = xfer->tx_buf;
591 do {
592 c -= 4;
593 if (tx != NULL) {
594 if (mcspi_wait_for_reg_bit(chstat_reg,
595 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
596 dev_err(&spi->dev, "TXS timed out\n");
597 goto out;
598 }
599 dev_vdbg(&spi->dev, "write-%d %08x\n",
600 word_len, *tx);
601 __raw_writel(*tx++, tx_reg);
602 }
603 if (rx != NULL) {
604 if (mcspi_wait_for_reg_bit(chstat_reg,
605 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
606 dev_err(&spi->dev, "RXS timed out\n");
607 goto out;
608 }
609
610 if (c == 4 && tx == NULL &&
611 (l & OMAP2_MCSPI_CHCONF_TURBO)) {
612 omap2_mcspi_set_enable(spi, 0);
613 *rx++ = __raw_readl(rx_reg);
614 dev_vdbg(&spi->dev, "read-%d %08x\n",
615 word_len, *(rx - 1));
616 if (mcspi_wait_for_reg_bit(chstat_reg,
617 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
618 dev_err(&spi->dev,
619 "RXS timed out\n");
620 goto out;
621 }
622 c = 0;
623 } else if (c == 0 && tx == NULL) {
624 omap2_mcspi_set_enable(spi, 0);
625 }
626
627 *rx++ = __raw_readl(rx_reg);
628 dev_vdbg(&spi->dev, "read-%d %08x\n",
629 word_len, *(rx - 1));
630 }
631 } while (c);
632 }
633
634 /* for TX_ONLY mode, be sure all words have shifted out */
635 if (xfer->rx_buf == NULL) {
636 if (mcspi_wait_for_reg_bit(chstat_reg,
637 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
638 dev_err(&spi->dev, "TXS timed out\n");
639 } else if (mcspi_wait_for_reg_bit(chstat_reg,
640 OMAP2_MCSPI_CHSTAT_EOT) < 0)
641 dev_err(&spi->dev, "EOT timed out\n");
642
643 /* disable chan to purge rx datas received in TX_ONLY transfer,
644 * otherwise these rx datas will affect the direct following
645 * RX_ONLY transfer.
646 */
647 omap2_mcspi_set_enable(spi, 0);
648 }
649 out:
650 omap2_mcspi_set_enable(spi, 1);
651 return count - c;
652 }
653
654 /* called only when no transfer is active to this device */
655 static int omap2_mcspi_setup_transfer(struct spi_device *spi,
656 struct spi_transfer *t)
657 {
658 struct omap2_mcspi_cs *cs = spi->controller_state;
659 struct omap2_mcspi *mcspi;
660 struct spi_master *spi_cntrl;
661 u32 l = 0, div = 0;
662 u8 word_len = spi->bits_per_word;
663 u32 speed_hz = spi->max_speed_hz;
664
665 mcspi = spi_master_get_devdata(spi->master);
666 spi_cntrl = mcspi->master;
667
668 if (t != NULL && t->bits_per_word)
669 word_len = t->bits_per_word;
670
671 cs->word_len = word_len;
672
673 if (t && t->speed_hz)
674 speed_hz = t->speed_hz;
675
676 if (speed_hz) {
677 while (div <= 15 && (OMAP2_MCSPI_MAX_FREQ / (1 << div))
678 > speed_hz)
679 div++;
680 } else
681 div = 15;
682
683 l = mcspi_cached_chconf0(spi);
684
685 /* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS
686 * REVISIT: this controller could support SPI_3WIRE mode.
687 */
688 l &= ~(OMAP2_MCSPI_CHCONF_IS|OMAP2_MCSPI_CHCONF_DPE1);
689 l |= OMAP2_MCSPI_CHCONF_DPE0;
690
691 /* wordlength */
692 l &= ~OMAP2_MCSPI_CHCONF_WL_MASK;
693 l |= (word_len - 1) << 7;
694
695 /* set chipselect polarity; manage with FORCE */
696 if (!(spi->mode & SPI_CS_HIGH))
697 l |= OMAP2_MCSPI_CHCONF_EPOL; /* active-low; normal */
698 else
699 l &= ~OMAP2_MCSPI_CHCONF_EPOL;
700
701 /* set clock divisor */
702 l &= ~OMAP2_MCSPI_CHCONF_CLKD_MASK;
703 l |= div << 2;
704
705 /* set SPI mode 0..3 */
706 if (spi->mode & SPI_CPOL)
707 l |= OMAP2_MCSPI_CHCONF_POL;
708 else
709 l &= ~OMAP2_MCSPI_CHCONF_POL;
710 if (spi->mode & SPI_CPHA)
711 l |= OMAP2_MCSPI_CHCONF_PHA;
712 else
713 l &= ~OMAP2_MCSPI_CHCONF_PHA;
714
715 mcspi_write_chconf0(spi, l);
716
717 dev_dbg(&spi->dev, "setup: speed %d, sample %s edge, clk %s\n",
718 OMAP2_MCSPI_MAX_FREQ / (1 << div),
719 (spi->mode & SPI_CPHA) ? "trailing" : "leading",
720 (spi->mode & SPI_CPOL) ? "inverted" : "normal");
721
722 return 0;
723 }
724
725 static void omap2_mcspi_dma_rx_callback(int lch, u16 ch_status, void *data)
726 {
727 struct spi_device *spi = data;
728 struct omap2_mcspi *mcspi;
729 struct omap2_mcspi_dma *mcspi_dma;
730
731 mcspi = spi_master_get_devdata(spi->master);
732 mcspi_dma = &(mcspi->dma_channels[spi->chip_select]);
733
734 complete(&mcspi_dma->dma_rx_completion);
735
736 /* We must disable the DMA RX request */
737 omap2_mcspi_set_dma_req(spi, 1, 0);
738 }
739
740 static void omap2_mcspi_dma_tx_callback(int lch, u16 ch_status, void *data)
741 {
742 struct spi_device *spi = data;
743 struct omap2_mcspi *mcspi;
744 struct omap2_mcspi_dma *mcspi_dma;
745
746 mcspi = spi_master_get_devdata(spi->master);
747 mcspi_dma = &(mcspi->dma_channels[spi->chip_select]);
748
749 complete(&mcspi_dma->dma_tx_completion);
750
751 /* We must disable the DMA TX request */
752 omap2_mcspi_set_dma_req(spi, 0, 0);
753 }
754
755 static int omap2_mcspi_request_dma(struct spi_device *spi)
756 {
757 struct spi_master *master = spi->master;
758 struct omap2_mcspi *mcspi;
759 struct omap2_mcspi_dma *mcspi_dma;
760
761 mcspi = spi_master_get_devdata(master);
762 mcspi_dma = mcspi->dma_channels + spi->chip_select;
763
764 if (omap_request_dma(mcspi_dma->dma_rx_sync_dev, "McSPI RX",
765 omap2_mcspi_dma_rx_callback, spi,
766 &mcspi_dma->dma_rx_channel)) {
767 dev_err(&spi->dev, "no RX DMA channel for McSPI\n");
768 return -EAGAIN;
769 }
770
771 if (omap_request_dma(mcspi_dma->dma_tx_sync_dev, "McSPI TX",
772 omap2_mcspi_dma_tx_callback, spi,
773 &mcspi_dma->dma_tx_channel)) {
774 omap_free_dma(mcspi_dma->dma_rx_channel);
775 mcspi_dma->dma_rx_channel = -1;
776 dev_err(&spi->dev, "no TX DMA channel for McSPI\n");
777 return -EAGAIN;
778 }
779
780 init_completion(&mcspi_dma->dma_rx_completion);
781 init_completion(&mcspi_dma->dma_tx_completion);
782
783 return 0;
784 }
785
786 static int omap2_mcspi_setup(struct spi_device *spi)
787 {
788 int ret;
789 struct omap2_mcspi *mcspi;
790 struct omap2_mcspi_dma *mcspi_dma;
791 struct omap2_mcspi_cs *cs = spi->controller_state;
792
793 if (spi->bits_per_word < 4 || spi->bits_per_word > 32) {
794 dev_dbg(&spi->dev, "setup: unsupported %d bit words\n",
795 spi->bits_per_word);
796 return -EINVAL;
797 }
798
799 mcspi = spi_master_get_devdata(spi->master);
800 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
801
802 if (!cs) {
803 cs = kzalloc(sizeof *cs, GFP_KERNEL);
804 if (!cs)
805 return -ENOMEM;
806 cs->base = mcspi->base + spi->chip_select * 0x14;
807 cs->phys = mcspi->phys + spi->chip_select * 0x14;
808 cs->chconf0 = 0;
809 spi->controller_state = cs;
810 /* Link this to context save list */
811 list_add_tail(&cs->node,
812 &omap2_mcspi_ctx[mcspi->master->bus_num - 1].cs);
813 }
814
815 if (mcspi_dma->dma_rx_channel == -1
816 || mcspi_dma->dma_tx_channel == -1) {
817 ret = omap2_mcspi_request_dma(spi);
818 if (ret < 0)
819 return ret;
820 }
821
822 if (omap2_mcspi_enable_clocks(mcspi))
823 return -ENODEV;
824
825 ret = omap2_mcspi_setup_transfer(spi, NULL);
826 omap2_mcspi_disable_clocks(mcspi);
827
828 return ret;
829 }
830
831 static void omap2_mcspi_cleanup(struct spi_device *spi)
832 {
833 struct omap2_mcspi *mcspi;
834 struct omap2_mcspi_dma *mcspi_dma;
835 struct omap2_mcspi_cs *cs;
836
837 mcspi = spi_master_get_devdata(spi->master);
838
839 if (spi->controller_state) {
840 /* Unlink controller state from context save list */
841 cs = spi->controller_state;
842 list_del(&cs->node);
843
844 kfree(spi->controller_state);
845 }
846
847 if (spi->chip_select < spi->master->num_chipselect) {
848 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
849
850 if (mcspi_dma->dma_rx_channel != -1) {
851 omap_free_dma(mcspi_dma->dma_rx_channel);
852 mcspi_dma->dma_rx_channel = -1;
853 }
854 if (mcspi_dma->dma_tx_channel != -1) {
855 omap_free_dma(mcspi_dma->dma_tx_channel);
856 mcspi_dma->dma_tx_channel = -1;
857 }
858 }
859 }
860
861 static void omap2_mcspi_work(struct work_struct *work)
862 {
863 struct omap2_mcspi *mcspi;
864
865 mcspi = container_of(work, struct omap2_mcspi, work);
866 spin_lock_irq(&mcspi->lock);
867
868 if (omap2_mcspi_enable_clocks(mcspi))
869 goto out;
870
871 /* We only enable one channel at a time -- the one whose message is
872 * at the head of the queue -- although this controller would gladly
873 * arbitrate among multiple channels. This corresponds to "single
874 * channel" master mode. As a side effect, we need to manage the
875 * chipselect with the FORCE bit ... CS != channel enable.
876 */
877 while (!list_empty(&mcspi->msg_queue)) {
878 struct spi_message *m;
879 struct spi_device *spi;
880 struct spi_transfer *t = NULL;
881 int cs_active = 0;
882 struct omap2_mcspi_cs *cs;
883 struct omap2_mcspi_device_config *cd;
884 int par_override = 0;
885 int status = 0;
886 u32 chconf;
887
888 m = container_of(mcspi->msg_queue.next, struct spi_message,
889 queue);
890
891 list_del_init(&m->queue);
892 spin_unlock_irq(&mcspi->lock);
893
894 spi = m->spi;
895 cs = spi->controller_state;
896 cd = spi->controller_data;
897
898 omap2_mcspi_set_enable(spi, 1);
899 list_for_each_entry(t, &m->transfers, transfer_list) {
900 if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
901 status = -EINVAL;
902 break;
903 }
904 if (par_override || t->speed_hz || t->bits_per_word) {
905 par_override = 1;
906 status = omap2_mcspi_setup_transfer(spi, t);
907 if (status < 0)
908 break;
909 if (!t->speed_hz && !t->bits_per_word)
910 par_override = 0;
911 }
912
913 if (!cs_active) {
914 omap2_mcspi_force_cs(spi, 1);
915 cs_active = 1;
916 }
917
918 chconf = mcspi_cached_chconf0(spi);
919 chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
920 chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
921
922 if (t->tx_buf == NULL)
923 chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
924 else if (t->rx_buf == NULL)
925 chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
926
927 if (cd && cd->turbo_mode && t->tx_buf == NULL) {
928 /* Turbo mode is for more than one word */
929 if (t->len > ((cs->word_len + 7) >> 3))
930 chconf |= OMAP2_MCSPI_CHCONF_TURBO;
931 }
932
933 mcspi_write_chconf0(spi, chconf);
934
935 if (t->len) {
936 unsigned count;
937
938 /* RX_ONLY mode needs dummy data in TX reg */
939 if (t->tx_buf == NULL)
940 __raw_writel(0, cs->base
941 + OMAP2_MCSPI_TX0);
942
943 if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES)
944 count = omap2_mcspi_txrx_dma(spi, t);
945 else
946 count = omap2_mcspi_txrx_pio(spi, t);
947 m->actual_length += count;
948
949 if (count != t->len) {
950 status = -EIO;
951 break;
952 }
953 }
954
955 if (t->delay_usecs)
956 udelay(t->delay_usecs);
957
958 /* ignore the "leave it on after last xfer" hint */
959 if (t->cs_change) {
960 omap2_mcspi_force_cs(spi, 0);
961 cs_active = 0;
962 }
963 }
964
965 /* Restore defaults if they were overriden */
966 if (par_override) {
967 par_override = 0;
968 status = omap2_mcspi_setup_transfer(spi, NULL);
969 }
970
971 if (cs_active)
972 omap2_mcspi_force_cs(spi, 0);
973
974 omap2_mcspi_set_enable(spi, 0);
975
976 m->status = status;
977 m->complete(m->context);
978
979 spin_lock_irq(&mcspi->lock);
980 }
981
982 omap2_mcspi_disable_clocks(mcspi);
983
984 out:
985 spin_unlock_irq(&mcspi->lock);
986 }
987
988 static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
989 {
990 struct omap2_mcspi *mcspi;
991 unsigned long flags;
992 struct spi_transfer *t;
993
994 m->actual_length = 0;
995 m->status = 0;
996
997 /* reject invalid messages and transfers */
998 if (list_empty(&m->transfers) || !m->complete)
999 return -EINVAL;
1000 list_for_each_entry(t, &m->transfers, transfer_list) {
1001 const void *tx_buf = t->tx_buf;
1002 void *rx_buf = t->rx_buf;
1003 unsigned len = t->len;
1004
1005 if (t->speed_hz > OMAP2_MCSPI_MAX_FREQ
1006 || (len && !(rx_buf || tx_buf))
1007 || (t->bits_per_word &&
1008 ( t->bits_per_word < 4
1009 || t->bits_per_word > 32))) {
1010 dev_dbg(&spi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
1011 t->speed_hz,
1012 len,
1013 tx_buf ? "tx" : "",
1014 rx_buf ? "rx" : "",
1015 t->bits_per_word);
1016 return -EINVAL;
1017 }
1018 if (t->speed_hz && t->speed_hz < OMAP2_MCSPI_MAX_FREQ/(1<<16)) {
1019 dev_dbg(&spi->dev, "%d Hz max exceeds %d\n",
1020 t->speed_hz,
1021 OMAP2_MCSPI_MAX_FREQ/(1<<16));
1022 return -EINVAL;
1023 }
1024
1025 if (m->is_dma_mapped || len < DMA_MIN_BYTES)
1026 continue;
1027
1028 if (tx_buf != NULL) {
1029 t->tx_dma = dma_map_single(&spi->dev, (void *) tx_buf,
1030 len, DMA_TO_DEVICE);
1031 if (dma_mapping_error(&spi->dev, t->tx_dma)) {
1032 dev_dbg(&spi->dev, "dma %cX %d bytes error\n",
1033 'T', len);
1034 return -EINVAL;
1035 }
1036 }
1037 if (rx_buf != NULL) {
1038 t->rx_dma = dma_map_single(&spi->dev, rx_buf, t->len,
1039 DMA_FROM_DEVICE);
1040 if (dma_mapping_error(&spi->dev, t->rx_dma)) {
1041 dev_dbg(&spi->dev, "dma %cX %d bytes error\n",
1042 'R', len);
1043 if (tx_buf != NULL)
1044 dma_unmap_single(&spi->dev, t->tx_dma,
1045 len, DMA_TO_DEVICE);
1046 return -EINVAL;
1047 }
1048 }
1049 }
1050
1051 mcspi = spi_master_get_devdata(spi->master);
1052
1053 spin_lock_irqsave(&mcspi->lock, flags);
1054 list_add_tail(&m->queue, &mcspi->msg_queue);
1055 queue_work(omap2_mcspi_wq, &mcspi->work);
1056 spin_unlock_irqrestore(&mcspi->lock, flags);
1057
1058 return 0;
1059 }
1060
1061 static int __init omap2_mcspi_reset(struct omap2_mcspi *mcspi)
1062 {
1063 struct spi_master *master = mcspi->master;
1064 u32 tmp;
1065
1066 if (omap2_mcspi_enable_clocks(mcspi))
1067 return -1;
1068
1069 mcspi_write_reg(master, OMAP2_MCSPI_SYSCONFIG,
1070 OMAP2_MCSPI_SYSCONFIG_SOFTRESET);
1071 do {
1072 tmp = mcspi_read_reg(master, OMAP2_MCSPI_SYSSTATUS);
1073 } while (!(tmp & OMAP2_MCSPI_SYSSTATUS_RESETDONE));
1074
1075 tmp = OMAP2_MCSPI_SYSCONFIG_AUTOIDLE |
1076 OMAP2_MCSPI_SYSCONFIG_ENAWAKEUP |
1077 OMAP2_MCSPI_SYSCONFIG_SMARTIDLE;
1078 mcspi_write_reg(master, OMAP2_MCSPI_SYSCONFIG, tmp);
1079 omap2_mcspi_ctx[master->bus_num - 1].sysconfig = tmp;
1080
1081 tmp = OMAP2_MCSPI_WAKEUPENABLE_WKEN;
1082 mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE, tmp);
1083 omap2_mcspi_ctx[master->bus_num - 1].wakeupenable = tmp;
1084
1085 omap2_mcspi_set_master_mode(master);
1086 omap2_mcspi_disable_clocks(mcspi);
1087 return 0;
1088 }
1089
1090 static u8 __initdata spi1_rxdma_id [] = {
1091 OMAP24XX_DMA_SPI1_RX0,
1092 OMAP24XX_DMA_SPI1_RX1,
1093 OMAP24XX_DMA_SPI1_RX2,
1094 OMAP24XX_DMA_SPI1_RX3,
1095 };
1096
1097 static u8 __initdata spi1_txdma_id [] = {
1098 OMAP24XX_DMA_SPI1_TX0,
1099 OMAP24XX_DMA_SPI1_TX1,
1100 OMAP24XX_DMA_SPI1_TX2,
1101 OMAP24XX_DMA_SPI1_TX3,
1102 };
1103
1104 static u8 __initdata spi2_rxdma_id[] = {
1105 OMAP24XX_DMA_SPI2_RX0,
1106 OMAP24XX_DMA_SPI2_RX1,
1107 };
1108
1109 static u8 __initdata spi2_txdma_id[] = {
1110 OMAP24XX_DMA_SPI2_TX0,
1111 OMAP24XX_DMA_SPI2_TX1,
1112 };
1113
1114 #if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP3) \
1115 || defined(CONFIG_ARCH_OMAP4)
1116 static u8 __initdata spi3_rxdma_id[] = {
1117 OMAP24XX_DMA_SPI3_RX0,
1118 OMAP24XX_DMA_SPI3_RX1,
1119 };
1120
1121 static u8 __initdata spi3_txdma_id[] = {
1122 OMAP24XX_DMA_SPI3_TX0,
1123 OMAP24XX_DMA_SPI3_TX1,
1124 };
1125 #endif
1126
1127 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
1128 static u8 __initdata spi4_rxdma_id[] = {
1129 OMAP34XX_DMA_SPI4_RX0,
1130 };
1131
1132 static u8 __initdata spi4_txdma_id[] = {
1133 OMAP34XX_DMA_SPI4_TX0,
1134 };
1135 #endif
1136
1137 static int __init omap2_mcspi_probe(struct platform_device *pdev)
1138 {
1139 struct spi_master *master;
1140 struct omap2_mcspi *mcspi;
1141 struct resource *r;
1142 int status = 0, i;
1143 const u8 *rxdma_id, *txdma_id;
1144 unsigned num_chipselect;
1145
1146 switch (pdev->id) {
1147 case 1:
1148 rxdma_id = spi1_rxdma_id;
1149 txdma_id = spi1_txdma_id;
1150 num_chipselect = 4;
1151 break;
1152 case 2:
1153 rxdma_id = spi2_rxdma_id;
1154 txdma_id = spi2_txdma_id;
1155 num_chipselect = 2;
1156 break;
1157 #if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP3) \
1158 || defined(CONFIG_ARCH_OMAP4)
1159 case 3:
1160 rxdma_id = spi3_rxdma_id;
1161 txdma_id = spi3_txdma_id;
1162 num_chipselect = 2;
1163 break;
1164 #endif
1165 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
1166 case 4:
1167 rxdma_id = spi4_rxdma_id;
1168 txdma_id = spi4_txdma_id;
1169 num_chipselect = 1;
1170 break;
1171 #endif
1172 default:
1173 return -EINVAL;
1174 }
1175
1176 master = spi_alloc_master(&pdev->dev, sizeof *mcspi);
1177 if (master == NULL) {
1178 dev_dbg(&pdev->dev, "master allocation failed\n");
1179 return -ENOMEM;
1180 }
1181
1182 /* the spi->mode bits understood by this driver: */
1183 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1184
1185 if (pdev->id != -1)
1186 master->bus_num = pdev->id;
1187
1188 master->setup = omap2_mcspi_setup;
1189 master->transfer = omap2_mcspi_transfer;
1190 master->cleanup = omap2_mcspi_cleanup;
1191 master->num_chipselect = num_chipselect;
1192
1193 dev_set_drvdata(&pdev->dev, master);
1194
1195 mcspi = spi_master_get_devdata(master);
1196 mcspi->master = master;
1197
1198 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1199 if (r == NULL) {
1200 status = -ENODEV;
1201 goto err1;
1202 }
1203 if (!request_mem_region(r->start, (r->end - r->start) + 1,
1204 dev_name(&pdev->dev))) {
1205 status = -EBUSY;
1206 goto err1;
1207 }
1208
1209 mcspi->phys = r->start;
1210 mcspi->base = ioremap(r->start, r->end - r->start + 1);
1211 if (!mcspi->base) {
1212 dev_dbg(&pdev->dev, "can't ioremap MCSPI\n");
1213 status = -ENOMEM;
1214 goto err1aa;
1215 }
1216
1217 INIT_WORK(&mcspi->work, omap2_mcspi_work);
1218
1219 spin_lock_init(&mcspi->lock);
1220 INIT_LIST_HEAD(&mcspi->msg_queue);
1221 INIT_LIST_HEAD(&omap2_mcspi_ctx[master->bus_num - 1].cs);
1222
1223 mcspi->ick = clk_get(&pdev->dev, "ick");
1224 if (IS_ERR(mcspi->ick)) {
1225 dev_dbg(&pdev->dev, "can't get mcspi_ick\n");
1226 status = PTR_ERR(mcspi->ick);
1227 goto err1a;
1228 }
1229 mcspi->fck = clk_get(&pdev->dev, "fck");
1230 if (IS_ERR(mcspi->fck)) {
1231 dev_dbg(&pdev->dev, "can't get mcspi_fck\n");
1232 status = PTR_ERR(mcspi->fck);
1233 goto err2;
1234 }
1235
1236 mcspi->dma_channels = kcalloc(master->num_chipselect,
1237 sizeof(struct omap2_mcspi_dma),
1238 GFP_KERNEL);
1239
1240 if (mcspi->dma_channels == NULL)
1241 goto err3;
1242
1243 for (i = 0; i < num_chipselect; i++) {
1244 mcspi->dma_channels[i].dma_rx_channel = -1;
1245 mcspi->dma_channels[i].dma_rx_sync_dev = rxdma_id[i];
1246 mcspi->dma_channels[i].dma_tx_channel = -1;
1247 mcspi->dma_channels[i].dma_tx_sync_dev = txdma_id[i];
1248 }
1249
1250 if (omap2_mcspi_reset(mcspi) < 0)
1251 goto err4;
1252
1253 status = spi_register_master(master);
1254 if (status < 0)
1255 goto err4;
1256
1257 return status;
1258
1259 err4:
1260 kfree(mcspi->dma_channels);
1261 err3:
1262 clk_put(mcspi->fck);
1263 err2:
1264 clk_put(mcspi->ick);
1265 err1a:
1266 iounmap(mcspi->base);
1267 err1aa:
1268 release_mem_region(r->start, (r->end - r->start) + 1);
1269 err1:
1270 spi_master_put(master);
1271 return status;
1272 }
1273
1274 static int __exit omap2_mcspi_remove(struct platform_device *pdev)
1275 {
1276 struct spi_master *master;
1277 struct omap2_mcspi *mcspi;
1278 struct omap2_mcspi_dma *dma_channels;
1279 struct resource *r;
1280 void __iomem *base;
1281
1282 master = dev_get_drvdata(&pdev->dev);
1283 mcspi = spi_master_get_devdata(master);
1284 dma_channels = mcspi->dma_channels;
1285
1286 clk_put(mcspi->fck);
1287 clk_put(mcspi->ick);
1288
1289 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1290 release_mem_region(r->start, (r->end - r->start) + 1);
1291
1292 base = mcspi->base;
1293 spi_unregister_master(master);
1294 iounmap(base);
1295 kfree(dma_channels);
1296
1297 return 0;
1298 }
1299
1300 /* work with hotplug and coldplug */
1301 MODULE_ALIAS("platform:omap2_mcspi");
1302
1303 #ifdef CONFIG_SUSPEND
1304 /*
1305 * When SPI wake up from off-mode, CS is in activate state. If it was in
1306 * unactive state when driver was suspend, then force it to unactive state at
1307 * wake up.
1308 */
1309 static int omap2_mcspi_resume(struct device *dev)
1310 {
1311 struct spi_master *master = dev_get_drvdata(dev);
1312 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
1313 struct omap2_mcspi_cs *cs;
1314
1315 omap2_mcspi_enable_clocks(mcspi);
1316 list_for_each_entry(cs, &omap2_mcspi_ctx[master->bus_num - 1].cs,
1317 node) {
1318 if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE) == 0) {
1319
1320 /*
1321 * We need to toggle CS state for OMAP take this
1322 * change in account.
1323 */
1324 MOD_REG_BIT(cs->chconf0, OMAP2_MCSPI_CHCONF_FORCE, 1);
1325 __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
1326 MOD_REG_BIT(cs->chconf0, OMAP2_MCSPI_CHCONF_FORCE, 0);
1327 __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
1328 }
1329 }
1330 omap2_mcspi_disable_clocks(mcspi);
1331 return 0;
1332 }
1333 #else
1334 #define omap2_mcspi_resume NULL
1335 #endif
1336
1337 static const struct dev_pm_ops omap2_mcspi_pm_ops = {
1338 .resume = omap2_mcspi_resume,
1339 };
1340
1341 static struct platform_driver omap2_mcspi_driver = {
1342 .driver = {
1343 .name = "omap2_mcspi",
1344 .owner = THIS_MODULE,
1345 .pm = &omap2_mcspi_pm_ops
1346 },
1347 .remove = __exit_p(omap2_mcspi_remove),
1348 };
1349
1350
1351 static int __init omap2_mcspi_init(void)
1352 {
1353 omap2_mcspi_wq = create_singlethread_workqueue(
1354 omap2_mcspi_driver.driver.name);
1355 if (omap2_mcspi_wq == NULL)
1356 return -1;
1357 return platform_driver_probe(&omap2_mcspi_driver, omap2_mcspi_probe);
1358 }
1359 subsys_initcall(omap2_mcspi_init);
1360
1361 static void __exit omap2_mcspi_exit(void)
1362 {
1363 platform_driver_unregister(&omap2_mcspi_driver);
1364
1365 destroy_workqueue(omap2_mcspi_wq);
1366 }
1367 module_exit(omap2_mcspi_exit);
1368
1369 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree