]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - drivers/spi/spi-omap2-mcspi.c
projects / mirror_ubuntu-jammy-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
spi: omap2-mcspi: Do not configure the controller on each transfer unless needed
[mirror_ubuntu-jammy-kernel.git] / drivers / spi / spi-omap2-mcspi.c
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 Yrj�l� <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/dmaengine.h>
32 #include <linux/omap-dma.h>
33 #include <linux/platform_device.h>
34 #include <linux/err.h>
35 #include <linux/clk.h>
36 #include <linux/io.h>
37 #include <linux/slab.h>
38 #include <linux/pm_runtime.h>
39 #include <linux/of.h>
40 #include <linux/of_device.h>
41 #include <linux/gcd.h>
42
43 #include <linux/spi/spi.h>
44
45 #include <linux/platform_data/spi-omap2-mcspi.h>
46
47 #define OMAP2_MCSPI_MAX_FREQ 48000000
48 #define OMAP2_MCSPI_MAX_FIFODEPTH 64
49 #define OMAP2_MCSPI_MAX_FIFOWCNT 0xFFFF
50 #define SPI_AUTOSUSPEND_TIMEOUT 2000
51
52 #define OMAP2_MCSPI_REVISION 0x00
53 #define OMAP2_MCSPI_SYSSTATUS 0x14
54 #define OMAP2_MCSPI_IRQSTATUS 0x18
55 #define OMAP2_MCSPI_IRQENABLE 0x1c
56 #define OMAP2_MCSPI_WAKEUPENABLE 0x20
57 #define OMAP2_MCSPI_SYST 0x24
58 #define OMAP2_MCSPI_MODULCTRL 0x28
59 #define OMAP2_MCSPI_XFERLEVEL 0x7c
60
61 /* per-channel banks, 0x14 bytes each, first is: */
62 #define OMAP2_MCSPI_CHCONF0 0x2c
63 #define OMAP2_MCSPI_CHSTAT0 0x30
64 #define OMAP2_MCSPI_CHCTRL0 0x34
65 #define OMAP2_MCSPI_TX0 0x38
66 #define OMAP2_MCSPI_RX0 0x3c
67
68 /* per-register bitmasks: */
69 #define OMAP2_MCSPI_IRQSTATUS_EOW BIT(17)
70
71 #define OMAP2_MCSPI_MODULCTRL_SINGLE BIT(0)
72 #define OMAP2_MCSPI_MODULCTRL_MS BIT(2)
73 #define OMAP2_MCSPI_MODULCTRL_STEST BIT(3)
74
75 #define OMAP2_MCSPI_CHCONF_PHA BIT(0)
76 #define OMAP2_MCSPI_CHCONF_POL BIT(1)
77 #define OMAP2_MCSPI_CHCONF_CLKD_MASK (0x0f << 2)
78 #define OMAP2_MCSPI_CHCONF_EPOL BIT(6)
79 #define OMAP2_MCSPI_CHCONF_WL_MASK (0x1f << 7)
80 #define OMAP2_MCSPI_CHCONF_TRM_RX_ONLY BIT(12)
81 #define OMAP2_MCSPI_CHCONF_TRM_TX_ONLY BIT(13)
82 #define OMAP2_MCSPI_CHCONF_TRM_MASK (0x03 << 12)
83 #define OMAP2_MCSPI_CHCONF_DMAW BIT(14)
84 #define OMAP2_MCSPI_CHCONF_DMAR BIT(15)
85 #define OMAP2_MCSPI_CHCONF_DPE0 BIT(16)
86 #define OMAP2_MCSPI_CHCONF_DPE1 BIT(17)
87 #define OMAP2_MCSPI_CHCONF_IS BIT(18)
88 #define OMAP2_MCSPI_CHCONF_TURBO BIT(19)
89 #define OMAP2_MCSPI_CHCONF_FORCE BIT(20)
90 #define OMAP2_MCSPI_CHCONF_FFET BIT(27)
91 #define OMAP2_MCSPI_CHCONF_FFER BIT(28)
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 #define OMAP2_MCSPI_CHSTAT_TXFFE BIT(3)
97
98 #define OMAP2_MCSPI_CHCTRL_EN BIT(0)
99
100 #define OMAP2_MCSPI_WAKEUPENABLE_WKEN BIT(0)
101
102 /* We have 2 DMA channels per CS, one for RX and one for TX */
103 struct omap2_mcspi_dma {
104 struct dma_chan *dma_tx;
105 struct dma_chan *dma_rx;
106
107 int dma_tx_sync_dev;
108 int dma_rx_sync_dev;
109
110 struct completion dma_tx_completion;
111 struct completion dma_rx_completion;
112
113 char dma_rx_ch_name[14];
114 char dma_tx_ch_name[14];
115 };
116
117 /* use PIO for small transfers, avoiding DMA setup/teardown overhead and
118 * cache operations; better heuristics consider wordsize and bitrate.
119 */
120 #define DMA_MIN_BYTES 160
121
122
123 /*
124 * Used for context save and restore, structure members to be updated whenever
125 * corresponding registers are modified.
126 */
127 struct omap2_mcspi_regs {
128 u32 modulctrl;
129 u32 wakeupenable;
130 struct list_head cs;
131 };
132
133 struct omap2_mcspi {
134 struct spi_master *master;
135 /* Virtual base address of the controller */
136 void __iomem *base;
137 unsigned long phys;
138 /* SPI1 has 4 channels, while SPI2 has 2 */
139 struct omap2_mcspi_dma *dma_channels;
140 struct device *dev;
141 struct omap2_mcspi_regs ctx;
142 int fifo_depth;
143 unsigned int pin_dir:1;
144 };
145
146 struct omap2_mcspi_cs {
147 void __iomem *base;
148 unsigned long phys;
149 int word_len;
150 struct list_head node;
151 /* Context save and restore shadow register */
152 u32 chconf0;
153 };
154
155 static inline void mcspi_write_reg(struct spi_master *master,
156 int idx, u32 val)
157 {
158 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
159
160 writel_relaxed(val, mcspi->base + idx);
161 }
162
163 static inline u32 mcspi_read_reg(struct spi_master *master, int idx)
164 {
165 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
166
167 return readl_relaxed(mcspi->base + idx);
168 }
169
170 static inline void mcspi_write_cs_reg(const struct spi_device *spi,
171 int idx, u32 val)
172 {
173 struct omap2_mcspi_cs *cs = spi->controller_state;
174
175 writel_relaxed(val, cs->base + idx);
176 }
177
178 static inline u32 mcspi_read_cs_reg(const struct spi_device *spi, int idx)
179 {
180 struct omap2_mcspi_cs *cs = spi->controller_state;
181
182 return readl_relaxed(cs->base + idx);
183 }
184
185 static inline u32 mcspi_cached_chconf0(const struct spi_device *spi)
186 {
187 struct omap2_mcspi_cs *cs = spi->controller_state;
188
189 return cs->chconf0;
190 }
191
192 static inline void mcspi_write_chconf0(const struct spi_device *spi, u32 val)
193 {
194 struct omap2_mcspi_cs *cs = spi->controller_state;
195
196 cs->chconf0 = val;
197 mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, val);
198 mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0);
199 }
200
201 static inline int mcspi_bytes_per_word(int word_len)
202 {
203 if (word_len <= 8)
204 return 1;
205 else if (word_len <= 16)
206 return 2;
207 else /* word_len <= 32 */
208 return 4;
209 }
210
211 static void omap2_mcspi_set_dma_req(const struct spi_device *spi,
212 int is_read, int enable)
213 {
214 u32 l, rw;
215
216 l = mcspi_cached_chconf0(spi);
217
218 if (is_read) /* 1 is read, 0 write */
219 rw = OMAP2_MCSPI_CHCONF_DMAR;
220 else
221 rw = OMAP2_MCSPI_CHCONF_DMAW;
222
223 if (enable)
224 l |= rw;
225 else
226 l &= ~rw;
227
228 mcspi_write_chconf0(spi, l);
229 }
230
231 static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable)
232 {
233 u32 l;
234
235 l = enable ? OMAP2_MCSPI_CHCTRL_EN : 0;
236 mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, l);
237 /* Flash post-writes */
238 mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0);
239 }
240
241 static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active)
242 {
243 u32 l;
244
245 l = mcspi_cached_chconf0(spi);
246 if (cs_active)
247 l |= OMAP2_MCSPI_CHCONF_FORCE;
248 else
249 l &= ~OMAP2_MCSPI_CHCONF_FORCE;
250
251 mcspi_write_chconf0(spi, l);
252 }
253
254 static void omap2_mcspi_set_master_mode(struct spi_master *master)
255 {
256 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
257 struct omap2_mcspi_regs *ctx = &mcspi->ctx;
258 u32 l;
259
260 /*
261 * Setup when switching from (reset default) slave mode
262 * to single-channel master mode
263 */
264 l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL);
265 l &= ~(OMAP2_MCSPI_MODULCTRL_STEST | OMAP2_MCSPI_MODULCTRL_MS);
266 l |= OMAP2_MCSPI_MODULCTRL_SINGLE;
267 mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l);
268
269 ctx->modulctrl = l;
270 }
271
272 static void omap2_mcspi_set_fifo(const struct spi_device *spi,
273 struct spi_transfer *t, int enable)
274 {
275 struct spi_master *master = spi->master;
276 struct omap2_mcspi_cs *cs = spi->controller_state;
277 struct omap2_mcspi *mcspi;
278 unsigned int wcnt;
279 int max_fifo_depth, fifo_depth, bytes_per_word;
280 u32 chconf, xferlevel;
281
282 mcspi = spi_master_get_devdata(master);
283
284 chconf = mcspi_cached_chconf0(spi);
285 if (enable) {
286 bytes_per_word = mcspi_bytes_per_word(cs->word_len);
287 if (t->len % bytes_per_word != 0)
288 goto disable_fifo;
289
290 if (t->rx_buf != NULL && t->tx_buf != NULL)
291 max_fifo_depth = OMAP2_MCSPI_MAX_FIFODEPTH / 2;
292 else
293 max_fifo_depth = OMAP2_MCSPI_MAX_FIFODEPTH;
294
295 fifo_depth = gcd(t->len, max_fifo_depth);
296 if (fifo_depth < 2 || fifo_depth % bytes_per_word != 0)
297 goto disable_fifo;
298
299 wcnt = t->len / bytes_per_word;
300 if (wcnt > OMAP2_MCSPI_MAX_FIFOWCNT)
301 goto disable_fifo;
302
303 xferlevel = wcnt << 16;
304 if (t->rx_buf != NULL) {
305 chconf |= OMAP2_MCSPI_CHCONF_FFER;
306 xferlevel |= (fifo_depth - 1) << 8;
307 }
308 if (t->tx_buf != NULL) {
309 chconf |= OMAP2_MCSPI_CHCONF_FFET;
310 xferlevel |= fifo_depth - 1;
311 }
312
313 mcspi_write_reg(master, OMAP2_MCSPI_XFERLEVEL, xferlevel);
314 mcspi_write_chconf0(spi, chconf);
315 mcspi->fifo_depth = fifo_depth;
316
317 return;
318 }
319
320 disable_fifo:
321 if (t->rx_buf != NULL)
322 chconf &= ~OMAP2_MCSPI_CHCONF_FFER;
323 else
324 chconf &= ~OMAP2_MCSPI_CHCONF_FFET;
325
326 mcspi_write_chconf0(spi, chconf);
327 mcspi->fifo_depth = 0;
328 }
329
330 static void omap2_mcspi_restore_ctx(struct omap2_mcspi *mcspi)
331 {
332 struct spi_master *spi_cntrl = mcspi->master;
333 struct omap2_mcspi_regs *ctx = &mcspi->ctx;
334 struct omap2_mcspi_cs *cs;
335
336 /* McSPI: context restore */
337 mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_MODULCTRL, ctx->modulctrl);
338 mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_WAKEUPENABLE, ctx->wakeupenable);
339
340 list_for_each_entry(cs, &ctx->cs, node)
341 writel_relaxed(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
342 }
343
344 static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit)
345 {
346 unsigned long timeout;
347
348 timeout = jiffies + msecs_to_jiffies(1000);
349 while (!(readl_relaxed(reg) & bit)) {
350 if (time_after(jiffies, timeout)) {
351 if (!(readl_relaxed(reg) & bit))
352 return -ETIMEDOUT;
353 else
354 return 0;
355 }
356 cpu_relax();
357 }
358 return 0;
359 }
360
361 static void omap2_mcspi_rx_callback(void *data)
362 {
363 struct spi_device *spi = data;
364 struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master);
365 struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select];
366
367 /* We must disable the DMA RX request */
368 omap2_mcspi_set_dma_req(spi, 1, 0);
369
370 complete(&mcspi_dma->dma_rx_completion);
371 }
372
373 static void omap2_mcspi_tx_callback(void *data)
374 {
375 struct spi_device *spi = data;
376 struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master);
377 struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select];
378
379 /* We must disable the DMA TX request */
380 omap2_mcspi_set_dma_req(spi, 0, 0);
381
382 complete(&mcspi_dma->dma_tx_completion);
383 }
384
385 static void omap2_mcspi_tx_dma(struct spi_device *spi,
386 struct spi_transfer *xfer,
387 struct dma_slave_config cfg)
388 {
389 struct omap2_mcspi *mcspi;
390 struct omap2_mcspi_dma *mcspi_dma;
391 unsigned int count;
392
393 mcspi = spi_master_get_devdata(spi->master);
394 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
395 count = xfer->len;
396
397 if (mcspi_dma->dma_tx) {
398 struct dma_async_tx_descriptor *tx;
399 struct scatterlist sg;
400
401 dmaengine_slave_config(mcspi_dma->dma_tx, &cfg);
402
403 sg_init_table(&sg, 1);
404 sg_dma_address(&sg) = xfer->tx_dma;
405 sg_dma_len(&sg) = xfer->len;
406
407 tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, &sg, 1,
408 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
409 if (tx) {
410 tx->callback = omap2_mcspi_tx_callback;
411 tx->callback_param = spi;
412 dmaengine_submit(tx);
413 } else {
414 /* FIXME: fall back to PIO? */
415 }
416 }
417 dma_async_issue_pending(mcspi_dma->dma_tx);
418 omap2_mcspi_set_dma_req(spi, 0, 1);
419
420 }
421
422 static unsigned
423 omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer,
424 struct dma_slave_config cfg,
425 unsigned es)
426 {
427 struct omap2_mcspi *mcspi;
428 struct omap2_mcspi_dma *mcspi_dma;
429 unsigned int count, dma_count;
430 u32 l;
431 int elements = 0;
432 int word_len, element_count;
433 struct omap2_mcspi_cs *cs = spi->controller_state;
434 mcspi = spi_master_get_devdata(spi->master);
435 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
436 count = xfer->len;
437 dma_count = xfer->len;
438
439 if (mcspi->fifo_depth == 0)
440 dma_count -= es;
441
442 word_len = cs->word_len;
443 l = mcspi_cached_chconf0(spi);
444
445 if (word_len <= 8)
446 element_count = count;
447 else if (word_len <= 16)
448 element_count = count >> 1;
449 else /* word_len <= 32 */
450 element_count = count >> 2;
451
452 if (mcspi_dma->dma_rx) {
453 struct dma_async_tx_descriptor *tx;
454 struct scatterlist sg;
455
456 dmaengine_slave_config(mcspi_dma->dma_rx, &cfg);
457
458 if ((l & OMAP2_MCSPI_CHCONF_TURBO) && mcspi->fifo_depth == 0)
459 dma_count -= es;
460
461 sg_init_table(&sg, 1);
462 sg_dma_address(&sg) = xfer->rx_dma;
463 sg_dma_len(&sg) = dma_count;
464
465 tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, &sg, 1,
466 DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT |
467 DMA_CTRL_ACK);
468 if (tx) {
469 tx->callback = omap2_mcspi_rx_callback;
470 tx->callback_param = spi;
471 dmaengine_submit(tx);
472 } else {
473 /* FIXME: fall back to PIO? */
474 }
475 }
476
477 dma_async_issue_pending(mcspi_dma->dma_rx);
478 omap2_mcspi_set_dma_req(spi, 1, 1);
479
480 wait_for_completion(&mcspi_dma->dma_rx_completion);
481 dma_unmap_single(mcspi->dev, xfer->rx_dma, count,
482 DMA_FROM_DEVICE);
483
484 if (mcspi->fifo_depth > 0)
485 return count;
486
487 omap2_mcspi_set_enable(spi, 0);
488
489 elements = element_count - 1;
490
491 if (l & OMAP2_MCSPI_CHCONF_TURBO) {
492 elements--;
493
494 if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
495 & OMAP2_MCSPI_CHSTAT_RXS)) {
496 u32 w;
497
498 w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
499 if (word_len <= 8)
500 ((u8 *)xfer->rx_buf)[elements++] = w;
501 else if (word_len <= 16)
502 ((u16 *)xfer->rx_buf)[elements++] = w;
503 else /* word_len <= 32 */
504 ((u32 *)xfer->rx_buf)[elements++] = w;
505 } else {
506 int bytes_per_word = mcspi_bytes_per_word(word_len);
507 dev_err(&spi->dev, "DMA RX penultimate word empty\n");
508 count -= (bytes_per_word << 1);
509 omap2_mcspi_set_enable(spi, 1);
510 return count;
511 }
512 }
513 if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
514 & OMAP2_MCSPI_CHSTAT_RXS)) {
515 u32 w;
516
517 w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
518 if (word_len <= 8)
519 ((u8 *)xfer->rx_buf)[elements] = w;
520 else if (word_len <= 16)
521 ((u16 *)xfer->rx_buf)[elements] = w;
522 else /* word_len <= 32 */
523 ((u32 *)xfer->rx_buf)[elements] = w;
524 } else {
525 dev_err(&spi->dev, "DMA RX last word empty\n");
526 count -= mcspi_bytes_per_word(word_len);
527 }
528 omap2_mcspi_set_enable(spi, 1);
529 return count;
530 }
531
532 static unsigned
533 omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
534 {
535 struct omap2_mcspi *mcspi;
536 struct omap2_mcspi_cs *cs = spi->controller_state;
537 struct omap2_mcspi_dma *mcspi_dma;
538 unsigned int count;
539 u32 l;
540 u8 *rx;
541 const u8 *tx;
542 struct dma_slave_config cfg;
543 enum dma_slave_buswidth width;
544 unsigned es;
545 u32 burst;
546 void __iomem *chstat_reg;
547 void __iomem *irqstat_reg;
548 int wait_res;
549
550 mcspi = spi_master_get_devdata(spi->master);
551 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
552 l = mcspi_cached_chconf0(spi);
553
554
555 if (cs->word_len <= 8) {
556 width = DMA_SLAVE_BUSWIDTH_1_BYTE;
557 es = 1;
558 } else if (cs->word_len <= 16) {
559 width = DMA_SLAVE_BUSWIDTH_2_BYTES;
560 es = 2;
561 } else {
562 width = DMA_SLAVE_BUSWIDTH_4_BYTES;
563 es = 4;
564 }
565
566 count = xfer->len;
567 burst = 1;
568
569 if (mcspi->fifo_depth > 0) {
570 if (count > mcspi->fifo_depth)
571 burst = mcspi->fifo_depth / es;
572 else
573 burst = count / es;
574 }
575
576 memset(&cfg, 0, sizeof(cfg));
577 cfg.src_addr = cs->phys + OMAP2_MCSPI_RX0;
578 cfg.dst_addr = cs->phys + OMAP2_MCSPI_TX0;
579 cfg.src_addr_width = width;
580 cfg.dst_addr_width = width;
581 cfg.src_maxburst = burst;
582 cfg.dst_maxburst = burst;
583
584 rx = xfer->rx_buf;
585 tx = xfer->tx_buf;
586
587 if (tx != NULL)
588 omap2_mcspi_tx_dma(spi, xfer, cfg);
589
590 if (rx != NULL)
591 count = omap2_mcspi_rx_dma(spi, xfer, cfg, es);
592
593 if (tx != NULL) {
594 wait_for_completion(&mcspi_dma->dma_tx_completion);
595 dma_unmap_single(mcspi->dev, xfer->tx_dma, xfer->len,
596 DMA_TO_DEVICE);
597
598 if (mcspi->fifo_depth > 0) {
599 irqstat_reg = mcspi->base + OMAP2_MCSPI_IRQSTATUS;
600
601 if (mcspi_wait_for_reg_bit(irqstat_reg,
602 OMAP2_MCSPI_IRQSTATUS_EOW) < 0)
603 dev_err(&spi->dev, "EOW timed out\n");
604
605 mcspi_write_reg(mcspi->master, OMAP2_MCSPI_IRQSTATUS,
606 OMAP2_MCSPI_IRQSTATUS_EOW);
607 }
608
609 /* for TX_ONLY mode, be sure all words have shifted out */
610 if (rx == NULL) {
611 chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0;
612 if (mcspi->fifo_depth > 0) {
613 wait_res = mcspi_wait_for_reg_bit(chstat_reg,
614 OMAP2_MCSPI_CHSTAT_TXFFE);
615 if (wait_res < 0)
616 dev_err(&spi->dev, "TXFFE timed out\n");
617 } else {
618 wait_res = mcspi_wait_for_reg_bit(chstat_reg,
619 OMAP2_MCSPI_CHSTAT_TXS);
620 if (wait_res < 0)
621 dev_err(&spi->dev, "TXS timed out\n");
622 }
623 if (wait_res >= 0 &&
624 (mcspi_wait_for_reg_bit(chstat_reg,
625 OMAP2_MCSPI_CHSTAT_EOT) < 0))
626 dev_err(&spi->dev, "EOT timed out\n");
627 }
628 }
629 return count;
630 }
631
632 static unsigned
633 omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
634 {
635 struct omap2_mcspi *mcspi;
636 struct omap2_mcspi_cs *cs = spi->controller_state;
637 unsigned int count, c;
638 u32 l;
639 void __iomem *base = cs->base;
640 void __iomem *tx_reg;
641 void __iomem *rx_reg;
642 void __iomem *chstat_reg;
643 int word_len;
644
645 mcspi = spi_master_get_devdata(spi->master);
646 count = xfer->len;
647 c = count;
648 word_len = cs->word_len;
649
650 l = mcspi_cached_chconf0(spi);
651
652 /* We store the pre-calculated register addresses on stack to speed
653 * up the transfer loop. */
654 tx_reg = base + OMAP2_MCSPI_TX0;
655 rx_reg = base + OMAP2_MCSPI_RX0;
656 chstat_reg = base + OMAP2_MCSPI_CHSTAT0;
657
658 if (c < (word_len>>3))
659 return 0;
660
661 if (word_len <= 8) {
662 u8 *rx;
663 const u8 *tx;
664
665 rx = xfer->rx_buf;
666 tx = xfer->tx_buf;
667
668 do {
669 c -= 1;
670 if (tx != NULL) {
671 if (mcspi_wait_for_reg_bit(chstat_reg,
672 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
673 dev_err(&spi->dev, "TXS timed out\n");
674 goto out;
675 }
676 dev_vdbg(&spi->dev, "write-%d %02x\n",
677 word_len, *tx);
678 writel_relaxed(*tx++, tx_reg);
679 }
680 if (rx != NULL) {
681 if (mcspi_wait_for_reg_bit(chstat_reg,
682 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
683 dev_err(&spi->dev, "RXS timed out\n");
684 goto out;
685 }
686
687 if (c == 1 && tx == NULL &&
688 (l & OMAP2_MCSPI_CHCONF_TURBO)) {
689 omap2_mcspi_set_enable(spi, 0);
690 *rx++ = readl_relaxed(rx_reg);
691 dev_vdbg(&spi->dev, "read-%d %02x\n",
692 word_len, *(rx - 1));
693 if (mcspi_wait_for_reg_bit(chstat_reg,
694 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
695 dev_err(&spi->dev,
696 "RXS timed out\n");
697 goto out;
698 }
699 c = 0;
700 } else if (c == 0 && tx == NULL) {
701 omap2_mcspi_set_enable(spi, 0);
702 }
703
704 *rx++ = readl_relaxed(rx_reg);
705 dev_vdbg(&spi->dev, "read-%d %02x\n",
706 word_len, *(rx - 1));
707 }
708 } while (c);
709 } else if (word_len <= 16) {
710 u16 *rx;
711 const u16 *tx;
712
713 rx = xfer->rx_buf;
714 tx = xfer->tx_buf;
715 do {
716 c -= 2;
717 if (tx != NULL) {
718 if (mcspi_wait_for_reg_bit(chstat_reg,
719 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
720 dev_err(&spi->dev, "TXS timed out\n");
721 goto out;
722 }
723 dev_vdbg(&spi->dev, "write-%d %04x\n",
724 word_len, *tx);
725 writel_relaxed(*tx++, tx_reg);
726 }
727 if (rx != NULL) {
728 if (mcspi_wait_for_reg_bit(chstat_reg,
729 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
730 dev_err(&spi->dev, "RXS timed out\n");
731 goto out;
732 }
733
734 if (c == 2 && tx == NULL &&
735 (l & OMAP2_MCSPI_CHCONF_TURBO)) {
736 omap2_mcspi_set_enable(spi, 0);
737 *rx++ = readl_relaxed(rx_reg);
738 dev_vdbg(&spi->dev, "read-%d %04x\n",
739 word_len, *(rx - 1));
740 if (mcspi_wait_for_reg_bit(chstat_reg,
741 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
742 dev_err(&spi->dev,
743 "RXS timed out\n");
744 goto out;
745 }
746 c = 0;
747 } else if (c == 0 && tx == NULL) {
748 omap2_mcspi_set_enable(spi, 0);
749 }
750
751 *rx++ = readl_relaxed(rx_reg);
752 dev_vdbg(&spi->dev, "read-%d %04x\n",
753 word_len, *(rx - 1));
754 }
755 } while (c >= 2);
756 } else if (word_len <= 32) {
757 u32 *rx;
758 const u32 *tx;
759
760 rx = xfer->rx_buf;
761 tx = xfer->tx_buf;
762 do {
763 c -= 4;
764 if (tx != NULL) {
765 if (mcspi_wait_for_reg_bit(chstat_reg,
766 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
767 dev_err(&spi->dev, "TXS timed out\n");
768 goto out;
769 }
770 dev_vdbg(&spi->dev, "write-%d %08x\n",
771 word_len, *tx);
772 writel_relaxed(*tx++, tx_reg);
773 }
774 if (rx != NULL) {
775 if (mcspi_wait_for_reg_bit(chstat_reg,
776 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
777 dev_err(&spi->dev, "RXS timed out\n");
778 goto out;
779 }
780
781 if (c == 4 && tx == NULL &&
782 (l & OMAP2_MCSPI_CHCONF_TURBO)) {
783 omap2_mcspi_set_enable(spi, 0);
784 *rx++ = readl_relaxed(rx_reg);
785 dev_vdbg(&spi->dev, "read-%d %08x\n",
786 word_len, *(rx - 1));
787 if (mcspi_wait_for_reg_bit(chstat_reg,
788 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
789 dev_err(&spi->dev,
790 "RXS timed out\n");
791 goto out;
792 }
793 c = 0;
794 } else if (c == 0 && tx == NULL) {
795 omap2_mcspi_set_enable(spi, 0);
796 }
797
798 *rx++ = readl_relaxed(rx_reg);
799 dev_vdbg(&spi->dev, "read-%d %08x\n",
800 word_len, *(rx - 1));
801 }
802 } while (c >= 4);
803 }
804
805 /* for TX_ONLY mode, be sure all words have shifted out */
806 if (xfer->rx_buf == NULL) {
807 if (mcspi_wait_for_reg_bit(chstat_reg,
808 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
809 dev_err(&spi->dev, "TXS timed out\n");
810 } else if (mcspi_wait_for_reg_bit(chstat_reg,
811 OMAP2_MCSPI_CHSTAT_EOT) < 0)
812 dev_err(&spi->dev, "EOT timed out\n");
813
814 /* disable chan to purge rx datas received in TX_ONLY transfer,
815 * otherwise these rx datas will affect the direct following
816 * RX_ONLY transfer.
817 */
818 omap2_mcspi_set_enable(spi, 0);
819 }
820 out:
821 omap2_mcspi_set_enable(spi, 1);
822 return count - c;
823 }
824
825 static u32 omap2_mcspi_calc_divisor(u32 speed_hz)
826 {
827 u32 div;
828
829 for (div = 0; div < 15; div++)
830 if (speed_hz >= (OMAP2_MCSPI_MAX_FREQ >> div))
831 return div;
832
833 return 15;
834 }
835
836 /* called only when no transfer is active to this device */
837 static int omap2_mcspi_setup_transfer(struct spi_device *spi,
838 struct spi_transfer *t)
839 {
840 struct omap2_mcspi_cs *cs = spi->controller_state;
841 struct omap2_mcspi *mcspi;
842 struct spi_master *spi_cntrl;
843 u32 l = 0, div = 0;
844 u8 word_len = spi->bits_per_word;
845 u32 speed_hz = spi->max_speed_hz;
846
847 mcspi = spi_master_get_devdata(spi->master);
848 spi_cntrl = mcspi->master;
849
850 if (t != NULL && t->bits_per_word)
851 word_len = t->bits_per_word;
852
853 cs->word_len = word_len;
854
855 if (t && t->speed_hz)
856 speed_hz = t->speed_hz;
857
858 speed_hz = min_t(u32, speed_hz, OMAP2_MCSPI_MAX_FREQ);
859 div = omap2_mcspi_calc_divisor(speed_hz);
860
861 l = mcspi_cached_chconf0(spi);
862
863 /* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS
864 * REVISIT: this controller could support SPI_3WIRE mode.
865 */
866 if (mcspi->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) {
867 l &= ~OMAP2_MCSPI_CHCONF_IS;
868 l &= ~OMAP2_MCSPI_CHCONF_DPE1;
869 l |= OMAP2_MCSPI_CHCONF_DPE0;
870 } else {
871 l |= OMAP2_MCSPI_CHCONF_IS;
872 l |= OMAP2_MCSPI_CHCONF_DPE1;
873 l &= ~OMAP2_MCSPI_CHCONF_DPE0;
874 }
875
876 /* wordlength */
877 l &= ~OMAP2_MCSPI_CHCONF_WL_MASK;
878 l |= (word_len - 1) << 7;
879
880 /* set chipselect polarity; manage with FORCE */
881 if (!(spi->mode & SPI_CS_HIGH))
882 l |= OMAP2_MCSPI_CHCONF_EPOL; /* active-low; normal */
883 else
884 l &= ~OMAP2_MCSPI_CHCONF_EPOL;
885
886 /* set clock divisor */
887 l &= ~OMAP2_MCSPI_CHCONF_CLKD_MASK;
888 l |= div << 2;
889
890 /* set SPI mode 0..3 */
891 if (spi->mode & SPI_CPOL)
892 l |= OMAP2_MCSPI_CHCONF_POL;
893 else
894 l &= ~OMAP2_MCSPI_CHCONF_POL;
895 if (spi->mode & SPI_CPHA)
896 l |= OMAP2_MCSPI_CHCONF_PHA;
897 else
898 l &= ~OMAP2_MCSPI_CHCONF_PHA;
899
900 mcspi_write_chconf0(spi, l);
901
902 dev_dbg(&spi->dev, "setup: speed %d, sample %s edge, clk %s\n",
903 OMAP2_MCSPI_MAX_FREQ >> div,
904 (spi->mode & SPI_CPHA) ? "trailing" : "leading",
905 (spi->mode & SPI_CPOL) ? "inverted" : "normal");
906
907 return 0;
908 }
909
910 /*
911 * Note that we currently allow DMA only if we get a channel
912 * for both rx and tx. Otherwise we'll do PIO for both rx and tx.
913 */
914 static int omap2_mcspi_request_dma(struct spi_device *spi)
915 {
916 struct spi_master *master = spi->master;
917 struct omap2_mcspi *mcspi;
918 struct omap2_mcspi_dma *mcspi_dma;
919 dma_cap_mask_t mask;
920 unsigned sig;
921
922 mcspi = spi_master_get_devdata(master);
923 mcspi_dma = mcspi->dma_channels + spi->chip_select;
924
925 init_completion(&mcspi_dma->dma_rx_completion);
926 init_completion(&mcspi_dma->dma_tx_completion);
927
928 dma_cap_zero(mask);
929 dma_cap_set(DMA_SLAVE, mask);
930 sig = mcspi_dma->dma_rx_sync_dev;
931
932 mcspi_dma->dma_rx =
933 dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
934 &sig, &master->dev,
935 mcspi_dma->dma_rx_ch_name);
936 if (!mcspi_dma->dma_rx)
937 goto no_dma;
938
939 sig = mcspi_dma->dma_tx_sync_dev;
940 mcspi_dma->dma_tx =
941 dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
942 &sig, &master->dev,
943 mcspi_dma->dma_tx_ch_name);
944
945 if (!mcspi_dma->dma_tx) {
946 dma_release_channel(mcspi_dma->dma_rx);
947 mcspi_dma->dma_rx = NULL;
948 goto no_dma;
949 }
950
951 return 0;
952
953 no_dma:
954 dev_warn(&spi->dev, "not using DMA for McSPI\n");
955 return -EAGAIN;
956 }
957
958 static int omap2_mcspi_setup(struct spi_device *spi)
959 {
960 int ret;
961 struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master);
962 struct omap2_mcspi_regs *ctx = &mcspi->ctx;
963 struct omap2_mcspi_dma *mcspi_dma;
964 struct omap2_mcspi_cs *cs = spi->controller_state;
965
966 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
967
968 if (!cs) {
969 cs = kzalloc(sizeof *cs, GFP_KERNEL);
970 if (!cs)
971 return -ENOMEM;
972 cs->base = mcspi->base + spi->chip_select * 0x14;
973 cs->phys = mcspi->phys + spi->chip_select * 0x14;
974 cs->chconf0 = 0;
975 spi->controller_state = cs;
976 /* Link this to context save list */
977 list_add_tail(&cs->node, &ctx->cs);
978 }
979
980 if (!mcspi_dma->dma_rx || !mcspi_dma->dma_tx) {
981 ret = omap2_mcspi_request_dma(spi);
982 if (ret < 0 && ret != -EAGAIN)
983 return ret;
984 }
985
986 ret = pm_runtime_get_sync(mcspi->dev);
987 if (ret < 0)
988 return ret;
989
990 ret = omap2_mcspi_setup_transfer(spi, NULL);
991 pm_runtime_mark_last_busy(mcspi->dev);
992 pm_runtime_put_autosuspend(mcspi->dev);
993
994 return ret;
995 }
996
997 static void omap2_mcspi_cleanup(struct spi_device *spi)
998 {
999 struct omap2_mcspi *mcspi;
1000 struct omap2_mcspi_dma *mcspi_dma;
1001 struct omap2_mcspi_cs *cs;
1002
1003 mcspi = spi_master_get_devdata(spi->master);
1004
1005 if (spi->controller_state) {
1006 /* Unlink controller state from context save list */
1007 cs = spi->controller_state;
1008 list_del(&cs->node);
1009
1010 kfree(cs);
1011 }
1012
1013 if (spi->chip_select < spi->master->num_chipselect) {
1014 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
1015
1016 if (mcspi_dma->dma_rx) {
1017 dma_release_channel(mcspi_dma->dma_rx);
1018 mcspi_dma->dma_rx = NULL;
1019 }
1020 if (mcspi_dma->dma_tx) {
1021 dma_release_channel(mcspi_dma->dma_tx);
1022 mcspi_dma->dma_tx = NULL;
1023 }
1024 }
1025 }
1026
1027 static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
1028 {
1029
1030 /* We only enable one channel at a time -- the one whose message is
1031 * -- although this controller would gladly
1032 * arbitrate among multiple channels. This corresponds to "single
1033 * channel" master mode. As a side effect, we need to manage the
1034 * chipselect with the FORCE bit ... CS != channel enable.
1035 */
1036
1037 struct spi_device *spi;
1038 struct spi_transfer *t = NULL;
1039 struct spi_master *master;
1040 struct omap2_mcspi_dma *mcspi_dma;
1041 int cs_active = 0;
1042 struct omap2_mcspi_cs *cs;
1043 struct omap2_mcspi_device_config *cd;
1044 int par_override = 0;
1045 int status = 0;
1046 u32 chconf;
1047
1048 spi = m->spi;
1049 master = spi->master;
1050 mcspi_dma = mcspi->dma_channels + spi->chip_select;
1051 cs = spi->controller_state;
1052 cd = spi->controller_data;
1053
1054 omap2_mcspi_set_enable(spi, 0);
1055 list_for_each_entry(t, &m->transfers, transfer_list) {
1056 if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
1057 status = -EINVAL;
1058 break;
1059 }
1060 if (par_override ||
1061 (t->speed_hz != spi->max_speed_hz) ||
1062 (t->bits_per_word != spi->bits_per_word)) {
1063 par_override = 1;
1064 status = omap2_mcspi_setup_transfer(spi, t);
1065 if (status < 0)
1066 break;
1067 if (t->speed_hz == spi->max_speed_hz &&
1068 t->bits_per_word == spi->bits_per_word)
1069 par_override = 0;
1070 }
1071 if (cd && cd->cs_per_word) {
1072 chconf = mcspi->ctx.modulctrl;
1073 chconf &= ~OMAP2_MCSPI_MODULCTRL_SINGLE;
1074 mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, chconf);
1075 mcspi->ctx.modulctrl =
1076 mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL);
1077 }
1078
1079
1080 if (!cs_active) {
1081 omap2_mcspi_force_cs(spi, 1);
1082 cs_active = 1;
1083 }
1084
1085 chconf = mcspi_cached_chconf0(spi);
1086 chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
1087 chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
1088
1089 if (t->tx_buf == NULL)
1090 chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
1091 else if (t->rx_buf == NULL)
1092 chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
1093
1094 if (cd && cd->turbo_mode && t->tx_buf == NULL) {
1095 /* Turbo mode is for more than one word */
1096 if (t->len > ((cs->word_len + 7) >> 3))
1097 chconf |= OMAP2_MCSPI_CHCONF_TURBO;
1098 }
1099
1100 mcspi_write_chconf0(spi, chconf);
1101
1102 if (t->len) {
1103 unsigned count;
1104
1105 if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) &&
1106 (m->is_dma_mapped || t->len >= DMA_MIN_BYTES))
1107 omap2_mcspi_set_fifo(spi, t, 1);
1108
1109 omap2_mcspi_set_enable(spi, 1);
1110
1111 /* RX_ONLY mode needs dummy data in TX reg */
1112 if (t->tx_buf == NULL)
1113 writel_relaxed(0, cs->base
1114 + OMAP2_MCSPI_TX0);
1115
1116 if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) &&
1117 (m->is_dma_mapped || t->len >= DMA_MIN_BYTES))
1118 count = omap2_mcspi_txrx_dma(spi, t);
1119 else
1120 count = omap2_mcspi_txrx_pio(spi, t);
1121 m->actual_length += count;
1122
1123 if (count != t->len) {
1124 status = -EIO;
1125 break;
1126 }
1127 }
1128
1129 if (t->delay_usecs)
1130 udelay(t->delay_usecs);
1131
1132 /* ignore the "leave it on after last xfer" hint */
1133 if (t->cs_change) {
1134 omap2_mcspi_force_cs(spi, 0);
1135 cs_active = 0;
1136 }
1137
1138 omap2_mcspi_set_enable(spi, 0);
1139
1140 if (mcspi->fifo_depth > 0)
1141 omap2_mcspi_set_fifo(spi, t, 0);
1142 }
1143 /* Restore defaults if they were overriden */
1144 if (par_override) {
1145 par_override = 0;
1146 status = omap2_mcspi_setup_transfer(spi, NULL);
1147 }
1148
1149 if (cs_active)
1150 omap2_mcspi_force_cs(spi, 0);
1151
1152 if (cd && cd->cs_per_word) {
1153 chconf = mcspi->ctx.modulctrl;
1154 chconf |= OMAP2_MCSPI_MODULCTRL_SINGLE;
1155 mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, chconf);
1156 mcspi->ctx.modulctrl =
1157 mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL);
1158 }
1159
1160 omap2_mcspi_set_enable(spi, 0);
1161
1162 if (mcspi->fifo_depth > 0 && t)
1163 omap2_mcspi_set_fifo(spi, t, 0);
1164
1165 m->status = status;
1166 }
1167
1168 static int omap2_mcspi_transfer_one_message(struct spi_master *master,
1169 struct spi_message *m)
1170 {
1171 struct spi_device *spi;
1172 struct omap2_mcspi *mcspi;
1173 struct omap2_mcspi_dma *mcspi_dma;
1174 struct spi_transfer *t;
1175
1176 spi = m->spi;
1177 mcspi = spi_master_get_devdata(master);
1178 mcspi_dma = mcspi->dma_channels + spi->chip_select;
1179 m->actual_length = 0;
1180 m->status = 0;
1181
1182 /* reject invalid messages and transfers */
1183 if (list_empty(&m->transfers))
1184 return -EINVAL;
1185 list_for_each_entry(t, &m->transfers, transfer_list) {
1186 const void *tx_buf = t->tx_buf;
1187 void *rx_buf = t->rx_buf;
1188 unsigned len = t->len;
1189
1190 if (t->speed_hz > OMAP2_MCSPI_MAX_FREQ
1191 || (len && !(rx_buf || tx_buf))) {
1192 dev_dbg(mcspi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
1193 t->speed_hz,
1194 len,
1195 tx_buf ? "tx" : "",
1196 rx_buf ? "rx" : "",
1197 t->bits_per_word);
1198 return -EINVAL;
1199 }
1200 if (t->speed_hz && t->speed_hz < (OMAP2_MCSPI_MAX_FREQ >> 15)) {
1201 dev_dbg(mcspi->dev, "speed_hz %d below minimum %d Hz\n",
1202 t->speed_hz,
1203 OMAP2_MCSPI_MAX_FREQ >> 15);
1204 return -EINVAL;
1205 }
1206
1207 if (m->is_dma_mapped || len < DMA_MIN_BYTES)
1208 continue;
1209
1210 if (mcspi_dma->dma_tx && tx_buf != NULL) {
1211 t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf,
1212 len, DMA_TO_DEVICE);
1213 if (dma_mapping_error(mcspi->dev, t->tx_dma)) {
1214 dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
1215 'T', len);
1216 return -EINVAL;
1217 }
1218 }
1219 if (mcspi_dma->dma_rx && rx_buf != NULL) {
1220 t->rx_dma = dma_map_single(mcspi->dev, rx_buf, t->len,
1221 DMA_FROM_DEVICE);
1222 if (dma_mapping_error(mcspi->dev, t->rx_dma)) {
1223 dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
1224 'R', len);
1225 if (tx_buf != NULL)
1226 dma_unmap_single(mcspi->dev, t->tx_dma,
1227 len, DMA_TO_DEVICE);
1228 return -EINVAL;
1229 }
1230 }
1231 }
1232
1233 omap2_mcspi_work(mcspi, m);
1234 spi_finalize_current_message(master);
1235 return 0;
1236 }
1237
1238 static int omap2_mcspi_master_setup(struct omap2_mcspi *mcspi)
1239 {
1240 struct spi_master *master = mcspi->master;
1241 struct omap2_mcspi_regs *ctx = &mcspi->ctx;
1242 int ret = 0;
1243
1244 ret = pm_runtime_get_sync(mcspi->dev);
1245 if (ret < 0)
1246 return ret;
1247
1248 mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE,
1249 OMAP2_MCSPI_WAKEUPENABLE_WKEN);
1250 ctx->wakeupenable = OMAP2_MCSPI_WAKEUPENABLE_WKEN;
1251
1252 omap2_mcspi_set_master_mode(master);
1253 pm_runtime_mark_last_busy(mcspi->dev);
1254 pm_runtime_put_autosuspend(mcspi->dev);
1255 return 0;
1256 }
1257
1258 static int omap_mcspi_runtime_resume(struct device *dev)
1259 {
1260 struct omap2_mcspi *mcspi;
1261 struct spi_master *master;
1262
1263 master = dev_get_drvdata(dev);
1264 mcspi = spi_master_get_devdata(master);
1265 omap2_mcspi_restore_ctx(mcspi);
1266
1267 return 0;
1268 }
1269
1270 static struct omap2_mcspi_platform_config omap2_pdata = {
1271 .regs_offset = 0,
1272 };
1273
1274 static struct omap2_mcspi_platform_config omap4_pdata = {
1275 .regs_offset = OMAP4_MCSPI_REG_OFFSET,
1276 };
1277
1278 static const struct of_device_id omap_mcspi_of_match[] = {
1279 {
1280 .compatible = "ti,omap2-mcspi",
1281 .data = &omap2_pdata,
1282 },
1283 {
1284 .compatible = "ti,omap4-mcspi",
1285 .data = &omap4_pdata,
1286 },
1287 { },
1288 };
1289 MODULE_DEVICE_TABLE(of, omap_mcspi_of_match);
1290
1291 static int omap2_mcspi_probe(struct platform_device *pdev)
1292 {
1293 struct spi_master *master;
1294 const struct omap2_mcspi_platform_config *pdata;
1295 struct omap2_mcspi *mcspi;
1296 struct resource *r;
1297 int status = 0, i;
1298 u32 regs_offset = 0;
1299 static int bus_num = 1;
1300 struct device_node *node = pdev->dev.of_node;
1301 const struct of_device_id *match;
1302
1303 master = spi_alloc_master(&pdev->dev, sizeof *mcspi);
1304 if (master == NULL) {
1305 dev_dbg(&pdev->dev, "master allocation failed\n");
1306 return -ENOMEM;
1307 }
1308
1309 /* the spi->mode bits understood by this driver: */
1310 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1311 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
1312 master->setup = omap2_mcspi_setup;
1313 master->auto_runtime_pm = true;
1314 master->transfer_one_message = omap2_mcspi_transfer_one_message;
1315 master->cleanup = omap2_mcspi_cleanup;
1316 master->dev.of_node = node;
1317
1318 platform_set_drvdata(pdev, master);
1319
1320 mcspi = spi_master_get_devdata(master);
1321 mcspi->master = master;
1322
1323 match = of_match_device(omap_mcspi_of_match, &pdev->dev);
1324 if (match) {
1325 u32 num_cs = 1; /* default number of chipselect */
1326 pdata = match->data;
1327
1328 of_property_read_u32(node, "ti,spi-num-cs", &num_cs);
1329 master->num_chipselect = num_cs;
1330 master->bus_num = bus_num++;
1331 if (of_get_property(node, "ti,pindir-d0-out-d1-in", NULL))
1332 mcspi->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN;
1333 } else {
1334 pdata = dev_get_platdata(&pdev->dev);
1335 master->num_chipselect = pdata->num_cs;
1336 if (pdev->id != -1)
1337 master->bus_num = pdev->id;
1338 mcspi->pin_dir = pdata->pin_dir;
1339 }
1340 regs_offset = pdata->regs_offset;
1341
1342 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1343 if (r == NULL) {
1344 status = -ENODEV;
1345 goto free_master;
1346 }
1347
1348 r->start += regs_offset;
1349 r->end += regs_offset;
1350 mcspi->phys = r->start;
1351
1352 mcspi->base = devm_ioremap_resource(&pdev->dev, r);
1353 if (IS_ERR(mcspi->base)) {
1354 status = PTR_ERR(mcspi->base);
1355 goto free_master;
1356 }
1357
1358 mcspi->dev = &pdev->dev;
1359
1360 INIT_LIST_HEAD(&mcspi->ctx.cs);
1361
1362 mcspi->dma_channels = kcalloc(master->num_chipselect,
1363 sizeof(struct omap2_mcspi_dma),
1364 GFP_KERNEL);
1365
1366 if (mcspi->dma_channels == NULL)
1367 goto free_master;
1368
1369 for (i = 0; i < master->num_chipselect; i++) {
1370 char *dma_rx_ch_name = mcspi->dma_channels[i].dma_rx_ch_name;
1371 char *dma_tx_ch_name = mcspi->dma_channels[i].dma_tx_ch_name;
1372 struct resource *dma_res;
1373
1374 sprintf(dma_rx_ch_name, "rx%d", i);
1375 if (!pdev->dev.of_node) {
1376 dma_res =
1377 platform_get_resource_byname(pdev,
1378 IORESOURCE_DMA,
1379 dma_rx_ch_name);
1380 if (!dma_res) {
1381 dev_dbg(&pdev->dev,
1382 "cannot get DMA RX channel\n");
1383 status = -ENODEV;
1384 break;
1385 }
1386
1387 mcspi->dma_channels[i].dma_rx_sync_dev =
1388 dma_res->start;
1389 }
1390 sprintf(dma_tx_ch_name, "tx%d", i);
1391 if (!pdev->dev.of_node) {
1392 dma_res =
1393 platform_get_resource_byname(pdev,
1394 IORESOURCE_DMA,
1395 dma_tx_ch_name);
1396 if (!dma_res) {
1397 dev_dbg(&pdev->dev,
1398 "cannot get DMA TX channel\n");
1399 status = -ENODEV;
1400 break;
1401 }
1402
1403 mcspi->dma_channels[i].dma_tx_sync_dev =
1404 dma_res->start;
1405 }
1406 }
1407
1408 if (status < 0)
1409 goto dma_chnl_free;
1410
1411 pm_runtime_use_autosuspend(&pdev->dev);
1412 pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
1413 pm_runtime_enable(&pdev->dev);
1414
1415 status = omap2_mcspi_master_setup(mcspi);
1416 if (status < 0)
1417 goto disable_pm;
1418
1419 status = devm_spi_register_master(&pdev->dev, master);
1420 if (status < 0)
1421 goto disable_pm;
1422
1423 return status;
1424
1425 disable_pm:
1426 pm_runtime_disable(&pdev->dev);
1427 dma_chnl_free:
1428 kfree(mcspi->dma_channels);
1429 free_master:
1430 spi_master_put(master);
1431 return status;
1432 }
1433
1434 static int omap2_mcspi_remove(struct platform_device *pdev)
1435 {
1436 struct spi_master *master;
1437 struct omap2_mcspi *mcspi;
1438 struct omap2_mcspi_dma *dma_channels;
1439
1440 master = platform_get_drvdata(pdev);
1441 mcspi = spi_master_get_devdata(master);
1442 dma_channels = mcspi->dma_channels;
1443
1444 pm_runtime_put_sync(mcspi->dev);
1445 pm_runtime_disable(&pdev->dev);
1446
1447 kfree(dma_channels);
1448
1449 return 0;
1450 }
1451
1452 /* work with hotplug and coldplug */
1453 MODULE_ALIAS("platform:omap2_mcspi");
1454
1455 #ifdef CONFIG_SUSPEND
1456 /*
1457 * When SPI wake up from off-mode, CS is in activate state. If it was in
1458 * unactive state when driver was suspend, then force it to unactive state at
1459 * wake up.
1460 */
1461 static int omap2_mcspi_resume(struct device *dev)
1462 {
1463 struct spi_master *master = dev_get_drvdata(dev);
1464 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
1465 struct omap2_mcspi_regs *ctx = &mcspi->ctx;
1466 struct omap2_mcspi_cs *cs;
1467
1468 pm_runtime_get_sync(mcspi->dev);
1469 list_for_each_entry(cs, &ctx->cs, node) {
1470 if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE) == 0) {
1471 /*
1472 * We need to toggle CS state for OMAP take this
1473 * change in account.
1474 */
1475 cs->chconf0 |= OMAP2_MCSPI_CHCONF_FORCE;
1476 writel_relaxed(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
1477 cs->chconf0 &= ~OMAP2_MCSPI_CHCONF_FORCE;
1478 writel_relaxed(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
1479 }
1480 }
1481 pm_runtime_mark_last_busy(mcspi->dev);
1482 pm_runtime_put_autosuspend(mcspi->dev);
1483 return 0;
1484 }
1485 #else
1486 #define omap2_mcspi_resume NULL
1487 #endif
1488
1489 static const struct dev_pm_ops omap2_mcspi_pm_ops = {
1490 .resume = omap2_mcspi_resume,
1491 .runtime_resume = omap_mcspi_runtime_resume,
1492 };
1493
1494 static struct platform_driver omap2_mcspi_driver = {
1495 .driver = {
1496 .name = "omap2_mcspi",
1497 .owner = THIS_MODULE,
1498 .pm = &omap2_mcspi_pm_ops,
1499 .of_match_table = omap_mcspi_of_match,
1500 },
1501 .probe = omap2_mcspi_probe,
1502 .remove = omap2_mcspi_remove,
1503 };
1504
1505 module_platform_driver(omap2_mcspi_driver);
1506 MODULE_LICENSE("GPL");
Ubuntu Jammy Linux kernel mirror