Loading...
1/*
2 * SH RSPI driver
3 *
4 * Copyright (C) 2012 Renesas Solutions Corp.
5 *
6 * Based on spi-sh.c:
7 * Copyright (C) 2011 Renesas Solutions Corp.
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/list.h>
29#include <linux/workqueue.h>
30#include <linux/interrupt.h>
31#include <linux/platform_device.h>
32#include <linux/io.h>
33#include <linux/clk.h>
34#include <linux/dmaengine.h>
35#include <linux/dma-mapping.h>
36#include <linux/sh_dma.h>
37#include <linux/spi/spi.h>
38#include <linux/spi/rspi.h>
39
40#define RSPI_SPCR 0x00
41#define RSPI_SSLP 0x01
42#define RSPI_SPPCR 0x02
43#define RSPI_SPSR 0x03
44#define RSPI_SPDR 0x04
45#define RSPI_SPSCR 0x08
46#define RSPI_SPSSR 0x09
47#define RSPI_SPBR 0x0a
48#define RSPI_SPDCR 0x0b
49#define RSPI_SPCKD 0x0c
50#define RSPI_SSLND 0x0d
51#define RSPI_SPND 0x0e
52#define RSPI_SPCR2 0x0f
53#define RSPI_SPCMD0 0x10
54#define RSPI_SPCMD1 0x12
55#define RSPI_SPCMD2 0x14
56#define RSPI_SPCMD3 0x16
57#define RSPI_SPCMD4 0x18
58#define RSPI_SPCMD5 0x1a
59#define RSPI_SPCMD6 0x1c
60#define RSPI_SPCMD7 0x1e
61
62/* SPCR */
63#define SPCR_SPRIE 0x80
64#define SPCR_SPE 0x40
65#define SPCR_SPTIE 0x20
66#define SPCR_SPEIE 0x10
67#define SPCR_MSTR 0x08
68#define SPCR_MODFEN 0x04
69#define SPCR_TXMD 0x02
70#define SPCR_SPMS 0x01
71
72/* SSLP */
73#define SSLP_SSL1P 0x02
74#define SSLP_SSL0P 0x01
75
76/* SPPCR */
77#define SPPCR_MOIFE 0x20
78#define SPPCR_MOIFV 0x10
79#define SPPCR_SPOM 0x04
80#define SPPCR_SPLP2 0x02
81#define SPPCR_SPLP 0x01
82
83/* SPSR */
84#define SPSR_SPRF 0x80
85#define SPSR_SPTEF 0x20
86#define SPSR_PERF 0x08
87#define SPSR_MODF 0x04
88#define SPSR_IDLNF 0x02
89#define SPSR_OVRF 0x01
90
91/* SPSCR */
92#define SPSCR_SPSLN_MASK 0x07
93
94/* SPSSR */
95#define SPSSR_SPECM_MASK 0x70
96#define SPSSR_SPCP_MASK 0x07
97
98/* SPDCR */
99#define SPDCR_SPLW 0x20
100#define SPDCR_SPRDTD 0x10
101#define SPDCR_SLSEL1 0x08
102#define SPDCR_SLSEL0 0x04
103#define SPDCR_SLSEL_MASK 0x0c
104#define SPDCR_SPFC1 0x02
105#define SPDCR_SPFC0 0x01
106
107/* SPCKD */
108#define SPCKD_SCKDL_MASK 0x07
109
110/* SSLND */
111#define SSLND_SLNDL_MASK 0x07
112
113/* SPND */
114#define SPND_SPNDL_MASK 0x07
115
116/* SPCR2 */
117#define SPCR2_PTE 0x08
118#define SPCR2_SPIE 0x04
119#define SPCR2_SPOE 0x02
120#define SPCR2_SPPE 0x01
121
122/* SPCMDn */
123#define SPCMD_SCKDEN 0x8000
124#define SPCMD_SLNDEN 0x4000
125#define SPCMD_SPNDEN 0x2000
126#define SPCMD_LSBF 0x1000
127#define SPCMD_SPB_MASK 0x0f00
128#define SPCMD_SPB_8_TO_16(bit) (((bit - 1) << 8) & SPCMD_SPB_MASK)
129#define SPCMD_SPB_20BIT 0x0000
130#define SPCMD_SPB_24BIT 0x0100
131#define SPCMD_SPB_32BIT 0x0200
132#define SPCMD_SSLKP 0x0080
133#define SPCMD_SSLA_MASK 0x0030
134#define SPCMD_BRDV_MASK 0x000c
135#define SPCMD_CPOL 0x0002
136#define SPCMD_CPHA 0x0001
137
138struct rspi_data {
139 void __iomem *addr;
140 u32 max_speed_hz;
141 struct spi_master *master;
142 struct list_head queue;
143 struct work_struct ws;
144 wait_queue_head_t wait;
145 spinlock_t lock;
146 struct clk *clk;
147 unsigned char spsr;
148
149 /* for dmaengine */
150 struct sh_dmae_slave dma_tx;
151 struct sh_dmae_slave dma_rx;
152 struct dma_chan *chan_tx;
153 struct dma_chan *chan_rx;
154 int irq;
155
156 unsigned dma_width_16bit:1;
157 unsigned dma_callbacked:1;
158};
159
160static void rspi_write8(struct rspi_data *rspi, u8 data, u16 offset)
161{
162 iowrite8(data, rspi->addr + offset);
163}
164
165static void rspi_write16(struct rspi_data *rspi, u16 data, u16 offset)
166{
167 iowrite16(data, rspi->addr + offset);
168}
169
170static u8 rspi_read8(struct rspi_data *rspi, u16 offset)
171{
172 return ioread8(rspi->addr + offset);
173}
174
175static u16 rspi_read16(struct rspi_data *rspi, u16 offset)
176{
177 return ioread16(rspi->addr + offset);
178}
179
180static unsigned char rspi_calc_spbr(struct rspi_data *rspi)
181{
182 int tmp;
183 unsigned char spbr;
184
185 tmp = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz) - 1;
186 spbr = clamp(tmp, 0, 255);
187
188 return spbr;
189}
190
191static void rspi_enable_irq(struct rspi_data *rspi, u8 enable)
192{
193 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | enable, RSPI_SPCR);
194}
195
196static void rspi_disable_irq(struct rspi_data *rspi, u8 disable)
197{
198 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~disable, RSPI_SPCR);
199}
200
201static int rspi_wait_for_interrupt(struct rspi_data *rspi, u8 wait_mask,
202 u8 enable_bit)
203{
204 int ret;
205
206 rspi->spsr = rspi_read8(rspi, RSPI_SPSR);
207 rspi_enable_irq(rspi, enable_bit);
208 ret = wait_event_timeout(rspi->wait, rspi->spsr & wait_mask, HZ);
209 if (ret == 0 && !(rspi->spsr & wait_mask))
210 return -ETIMEDOUT;
211
212 return 0;
213}
214
215static void rspi_assert_ssl(struct rspi_data *rspi)
216{
217 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_SPE, RSPI_SPCR);
218}
219
220static void rspi_negate_ssl(struct rspi_data *rspi)
221{
222 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_SPE, RSPI_SPCR);
223}
224
225static int rspi_set_config_register(struct rspi_data *rspi, int access_size)
226{
227 /* Sets output mode(CMOS) and MOSI signal(from previous transfer) */
228 rspi_write8(rspi, 0x00, RSPI_SPPCR);
229
230 /* Sets transfer bit rate */
231 rspi_write8(rspi, rspi_calc_spbr(rspi), RSPI_SPBR);
232
233 /* Sets number of frames to be used: 1 frame */
234 rspi_write8(rspi, 0x00, RSPI_SPDCR);
235
236 /* Sets RSPCK, SSL, next-access delay value */
237 rspi_write8(rspi, 0x00, RSPI_SPCKD);
238 rspi_write8(rspi, 0x00, RSPI_SSLND);
239 rspi_write8(rspi, 0x00, RSPI_SPND);
240
241 /* Sets parity, interrupt mask */
242 rspi_write8(rspi, 0x00, RSPI_SPCR2);
243
244 /* Sets SPCMD */
245 rspi_write16(rspi, SPCMD_SPB_8_TO_16(access_size) | SPCMD_SSLKP,
246 RSPI_SPCMD0);
247
248 /* Sets RSPI mode */
249 rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR);
250
251 return 0;
252}
253
254static int rspi_send_pio(struct rspi_data *rspi, struct spi_message *mesg,
255 struct spi_transfer *t)
256{
257 int remain = t->len;
258 u8 *data;
259
260 data = (u8 *)t->tx_buf;
261 while (remain > 0) {
262 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_TXMD,
263 RSPI_SPCR);
264
265 if (rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE) < 0) {
266 dev_err(&rspi->master->dev,
267 "%s: tx empty timeout\n", __func__);
268 return -ETIMEDOUT;
269 }
270
271 rspi_write16(rspi, *data, RSPI_SPDR);
272 data++;
273 remain--;
274 }
275
276 /* Waiting for the last transmition */
277 rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE);
278
279 return 0;
280}
281
282static void rspi_dma_complete(void *arg)
283{
284 struct rspi_data *rspi = arg;
285
286 rspi->dma_callbacked = 1;
287 wake_up_interruptible(&rspi->wait);
288}
289
290static int rspi_dma_map_sg(struct scatterlist *sg, void *buf, unsigned len,
291 struct dma_chan *chan,
292 enum dma_transfer_direction dir)
293{
294 sg_init_table(sg, 1);
295 sg_set_buf(sg, buf, len);
296 sg_dma_len(sg) = len;
297 return dma_map_sg(chan->device->dev, sg, 1, dir);
298}
299
300static void rspi_dma_unmap_sg(struct scatterlist *sg, struct dma_chan *chan,
301 enum dma_transfer_direction dir)
302{
303 dma_unmap_sg(chan->device->dev, sg, 1, dir);
304}
305
306static void rspi_memory_to_8bit(void *buf, const void *data, unsigned len)
307{
308 u16 *dst = buf;
309 const u8 *src = data;
310
311 while (len) {
312 *dst++ = (u16)(*src++);
313 len--;
314 }
315}
316
317static void rspi_memory_from_8bit(void *buf, const void *data, unsigned len)
318{
319 u8 *dst = buf;
320 const u16 *src = data;
321
322 while (len) {
323 *dst++ = (u8)*src++;
324 len--;
325 }
326}
327
328static int rspi_send_dma(struct rspi_data *rspi, struct spi_transfer *t)
329{
330 struct scatterlist sg;
331 void *buf = NULL;
332 struct dma_async_tx_descriptor *desc;
333 unsigned len;
334 int ret = 0;
335
336 if (rspi->dma_width_16bit) {
337 /*
338 * If DMAC bus width is 16-bit, the driver allocates a dummy
339 * buffer. And, the driver converts original data into the
340 * DMAC data as the following format:
341 * original data: 1st byte, 2nd byte ...
342 * DMAC data: 1st byte, dummy, 2nd byte, dummy ...
343 */
344 len = t->len * 2;
345 buf = kmalloc(len, GFP_KERNEL);
346 if (!buf)
347 return -ENOMEM;
348 rspi_memory_to_8bit(buf, t->tx_buf, t->len);
349 } else {
350 len = t->len;
351 buf = (void *)t->tx_buf;
352 }
353
354 if (!rspi_dma_map_sg(&sg, buf, len, rspi->chan_tx, DMA_TO_DEVICE)) {
355 ret = -EFAULT;
356 goto end_nomap;
357 }
358 desc = dmaengine_prep_slave_sg(rspi->chan_tx, &sg, 1, DMA_TO_DEVICE,
359 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
360 if (!desc) {
361 ret = -EIO;
362 goto end;
363 }
364
365 /*
366 * DMAC needs SPTIE, but if SPTIE is set, this IRQ routine will be
367 * called. So, this driver disables the IRQ while DMA transfer.
368 */
369 disable_irq(rspi->irq);
370
371 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_TXMD, RSPI_SPCR);
372 rspi_enable_irq(rspi, SPCR_SPTIE);
373 rspi->dma_callbacked = 0;
374
375 desc->callback = rspi_dma_complete;
376 desc->callback_param = rspi;
377 dmaengine_submit(desc);
378 dma_async_issue_pending(rspi->chan_tx);
379
380 ret = wait_event_interruptible_timeout(rspi->wait,
381 rspi->dma_callbacked, HZ);
382 if (ret > 0 && rspi->dma_callbacked)
383 ret = 0;
384 else if (!ret)
385 ret = -ETIMEDOUT;
386 rspi_disable_irq(rspi, SPCR_SPTIE);
387
388 enable_irq(rspi->irq);
389
390end:
391 rspi_dma_unmap_sg(&sg, rspi->chan_tx, DMA_TO_DEVICE);
392end_nomap:
393 if (rspi->dma_width_16bit)
394 kfree(buf);
395
396 return ret;
397}
398
399static void rspi_receive_init(struct rspi_data *rspi)
400{
401 unsigned char spsr;
402
403 spsr = rspi_read8(rspi, RSPI_SPSR);
404 if (spsr & SPSR_SPRF)
405 rspi_read16(rspi, RSPI_SPDR); /* dummy read */
406 if (spsr & SPSR_OVRF)
407 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPSR) & ~SPSR_OVRF,
408 RSPI_SPCR);
409}
410
411static int rspi_receive_pio(struct rspi_data *rspi, struct spi_message *mesg,
412 struct spi_transfer *t)
413{
414 int remain = t->len;
415 u8 *data;
416
417 rspi_receive_init(rspi);
418
419 data = (u8 *)t->rx_buf;
420 while (remain > 0) {
421 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_TXMD,
422 RSPI_SPCR);
423
424 if (rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE) < 0) {
425 dev_err(&rspi->master->dev,
426 "%s: tx empty timeout\n", __func__);
427 return -ETIMEDOUT;
428 }
429 /* dummy write for generate clock */
430 rspi_write16(rspi, 0x00, RSPI_SPDR);
431
432 if (rspi_wait_for_interrupt(rspi, SPSR_SPRF, SPCR_SPRIE) < 0) {
433 dev_err(&rspi->master->dev,
434 "%s: receive timeout\n", __func__);
435 return -ETIMEDOUT;
436 }
437 /* SPDR allows 16 or 32-bit access only */
438 *data = (u8)rspi_read16(rspi, RSPI_SPDR);
439
440 data++;
441 remain--;
442 }
443
444 return 0;
445}
446
447static int rspi_receive_dma(struct rspi_data *rspi, struct spi_transfer *t)
448{
449 struct scatterlist sg, sg_dummy;
450 void *dummy = NULL, *rx_buf = NULL;
451 struct dma_async_tx_descriptor *desc, *desc_dummy;
452 unsigned len;
453 int ret = 0;
454
455 if (rspi->dma_width_16bit) {
456 /*
457 * If DMAC bus width is 16-bit, the driver allocates a dummy
458 * buffer. And, finally the driver converts the DMAC data into
459 * actual data as the following format:
460 * DMAC data: 1st byte, dummy, 2nd byte, dummy ...
461 * actual data: 1st byte, 2nd byte ...
462 */
463 len = t->len * 2;
464 rx_buf = kmalloc(len, GFP_KERNEL);
465 if (!rx_buf)
466 return -ENOMEM;
467 } else {
468 len = t->len;
469 rx_buf = t->rx_buf;
470 }
471
472 /* prepare dummy transfer to generate SPI clocks */
473 dummy = kzalloc(len, GFP_KERNEL);
474 if (!dummy) {
475 ret = -ENOMEM;
476 goto end_nomap;
477 }
478 if (!rspi_dma_map_sg(&sg_dummy, dummy, len, rspi->chan_tx,
479 DMA_TO_DEVICE)) {
480 ret = -EFAULT;
481 goto end_nomap;
482 }
483 desc_dummy = dmaengine_prep_slave_sg(rspi->chan_tx, &sg_dummy, 1,
484 DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
485 if (!desc_dummy) {
486 ret = -EIO;
487 goto end_dummy_mapped;
488 }
489
490 /* prepare receive transfer */
491 if (!rspi_dma_map_sg(&sg, rx_buf, len, rspi->chan_rx,
492 DMA_FROM_DEVICE)) {
493 ret = -EFAULT;
494 goto end_dummy_mapped;
495
496 }
497 desc = dmaengine_prep_slave_sg(rspi->chan_rx, &sg, 1, DMA_FROM_DEVICE,
498 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
499 if (!desc) {
500 ret = -EIO;
501 goto end;
502 }
503
504 rspi_receive_init(rspi);
505
506 /*
507 * DMAC needs SPTIE, but if SPTIE is set, this IRQ routine will be
508 * called. So, this driver disables the IRQ while DMA transfer.
509 */
510 disable_irq(rspi->irq);
511
512 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_TXMD, RSPI_SPCR);
513 rspi_enable_irq(rspi, SPCR_SPTIE | SPCR_SPRIE);
514 rspi->dma_callbacked = 0;
515
516 desc->callback = rspi_dma_complete;
517 desc->callback_param = rspi;
518 dmaengine_submit(desc);
519 dma_async_issue_pending(rspi->chan_rx);
520
521 desc_dummy->callback = NULL; /* No callback */
522 dmaengine_submit(desc_dummy);
523 dma_async_issue_pending(rspi->chan_tx);
524
525 ret = wait_event_interruptible_timeout(rspi->wait,
526 rspi->dma_callbacked, HZ);
527 if (ret > 0 && rspi->dma_callbacked)
528 ret = 0;
529 else if (!ret)
530 ret = -ETIMEDOUT;
531 rspi_disable_irq(rspi, SPCR_SPTIE | SPCR_SPRIE);
532
533 enable_irq(rspi->irq);
534
535end:
536 rspi_dma_unmap_sg(&sg, rspi->chan_rx, DMA_FROM_DEVICE);
537end_dummy_mapped:
538 rspi_dma_unmap_sg(&sg_dummy, rspi->chan_tx, DMA_TO_DEVICE);
539end_nomap:
540 if (rspi->dma_width_16bit) {
541 if (!ret)
542 rspi_memory_from_8bit(t->rx_buf, rx_buf, t->len);
543 kfree(rx_buf);
544 }
545 kfree(dummy);
546
547 return ret;
548}
549
550static int rspi_is_dma(struct rspi_data *rspi, struct spi_transfer *t)
551{
552 if (t->tx_buf && rspi->chan_tx)
553 return 1;
554 /* If the module receives data by DMAC, it also needs TX DMAC */
555 if (t->rx_buf && rspi->chan_tx && rspi->chan_rx)
556 return 1;
557
558 return 0;
559}
560
561static void rspi_work(struct work_struct *work)
562{
563 struct rspi_data *rspi = container_of(work, struct rspi_data, ws);
564 struct spi_message *mesg;
565 struct spi_transfer *t;
566 unsigned long flags;
567 int ret;
568
569 spin_lock_irqsave(&rspi->lock, flags);
570 while (!list_empty(&rspi->queue)) {
571 mesg = list_entry(rspi->queue.next, struct spi_message, queue);
572 list_del_init(&mesg->queue);
573 spin_unlock_irqrestore(&rspi->lock, flags);
574
575 rspi_assert_ssl(rspi);
576
577 list_for_each_entry(t, &mesg->transfers, transfer_list) {
578 if (t->tx_buf) {
579 if (rspi_is_dma(rspi, t))
580 ret = rspi_send_dma(rspi, t);
581 else
582 ret = rspi_send_pio(rspi, mesg, t);
583 if (ret < 0)
584 goto error;
585 }
586 if (t->rx_buf) {
587 if (rspi_is_dma(rspi, t))
588 ret = rspi_receive_dma(rspi, t);
589 else
590 ret = rspi_receive_pio(rspi, mesg, t);
591 if (ret < 0)
592 goto error;
593 }
594 mesg->actual_length += t->len;
595 }
596 rspi_negate_ssl(rspi);
597
598 mesg->status = 0;
599 mesg->complete(mesg->context);
600
601 spin_lock_irqsave(&rspi->lock, flags);
602 }
603
604 return;
605
606error:
607 mesg->status = ret;
608 mesg->complete(mesg->context);
609}
610
611static int rspi_setup(struct spi_device *spi)
612{
613 struct rspi_data *rspi = spi_master_get_devdata(spi->master);
614
615 if (!spi->bits_per_word)
616 spi->bits_per_word = 8;
617 rspi->max_speed_hz = spi->max_speed_hz;
618
619 rspi_set_config_register(rspi, 8);
620
621 return 0;
622}
623
624static int rspi_transfer(struct spi_device *spi, struct spi_message *mesg)
625{
626 struct rspi_data *rspi = spi_master_get_devdata(spi->master);
627 unsigned long flags;
628
629 mesg->actual_length = 0;
630 mesg->status = -EINPROGRESS;
631
632 spin_lock_irqsave(&rspi->lock, flags);
633 list_add_tail(&mesg->queue, &rspi->queue);
634 schedule_work(&rspi->ws);
635 spin_unlock_irqrestore(&rspi->lock, flags);
636
637 return 0;
638}
639
640static void rspi_cleanup(struct spi_device *spi)
641{
642}
643
644static irqreturn_t rspi_irq(int irq, void *_sr)
645{
646 struct rspi_data *rspi = (struct rspi_data *)_sr;
647 unsigned long spsr;
648 irqreturn_t ret = IRQ_NONE;
649 unsigned char disable_irq = 0;
650
651 rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR);
652 if (spsr & SPSR_SPRF)
653 disable_irq |= SPCR_SPRIE;
654 if (spsr & SPSR_SPTEF)
655 disable_irq |= SPCR_SPTIE;
656
657 if (disable_irq) {
658 ret = IRQ_HANDLED;
659 rspi_disable_irq(rspi, disable_irq);
660 wake_up(&rspi->wait);
661 }
662
663 return ret;
664}
665
666static bool rspi_filter(struct dma_chan *chan, void *filter_param)
667{
668 chan->private = filter_param;
669 return true;
670}
671
672static void __devinit rspi_request_dma(struct rspi_data *rspi,
673 struct platform_device *pdev)
674{
675 struct rspi_plat_data *rspi_pd = pdev->dev.platform_data;
676 dma_cap_mask_t mask;
677
678 if (!rspi_pd)
679 return;
680
681 rspi->dma_width_16bit = rspi_pd->dma_width_16bit;
682
683 /* If the module receives data by DMAC, it also needs TX DMAC */
684 if (rspi_pd->dma_rx_id && rspi_pd->dma_tx_id) {
685 dma_cap_zero(mask);
686 dma_cap_set(DMA_SLAVE, mask);
687 rspi->dma_rx.slave_id = rspi_pd->dma_rx_id;
688 rspi->chan_rx = dma_request_channel(mask, rspi_filter,
689 &rspi->dma_rx);
690 if (rspi->chan_rx)
691 dev_info(&pdev->dev, "Use DMA when rx.\n");
692 }
693 if (rspi_pd->dma_tx_id) {
694 dma_cap_zero(mask);
695 dma_cap_set(DMA_SLAVE, mask);
696 rspi->dma_tx.slave_id = rspi_pd->dma_tx_id;
697 rspi->chan_tx = dma_request_channel(mask, rspi_filter,
698 &rspi->dma_tx);
699 if (rspi->chan_tx)
700 dev_info(&pdev->dev, "Use DMA when tx\n");
701 }
702}
703
704static void __devexit rspi_release_dma(struct rspi_data *rspi)
705{
706 if (rspi->chan_tx)
707 dma_release_channel(rspi->chan_tx);
708 if (rspi->chan_rx)
709 dma_release_channel(rspi->chan_rx);
710}
711
712static int __devexit rspi_remove(struct platform_device *pdev)
713{
714 struct rspi_data *rspi = dev_get_drvdata(&pdev->dev);
715
716 spi_unregister_master(rspi->master);
717 rspi_release_dma(rspi);
718 free_irq(platform_get_irq(pdev, 0), rspi);
719 clk_put(rspi->clk);
720 iounmap(rspi->addr);
721 spi_master_put(rspi->master);
722
723 return 0;
724}
725
726static int __devinit rspi_probe(struct platform_device *pdev)
727{
728 struct resource *res;
729 struct spi_master *master;
730 struct rspi_data *rspi;
731 int ret, irq;
732 char clk_name[16];
733
734 /* get base addr */
735 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
736 if (unlikely(res == NULL)) {
737 dev_err(&pdev->dev, "invalid resource\n");
738 return -EINVAL;
739 }
740
741 irq = platform_get_irq(pdev, 0);
742 if (irq < 0) {
743 dev_err(&pdev->dev, "platform_get_irq error\n");
744 return -ENODEV;
745 }
746
747 master = spi_alloc_master(&pdev->dev, sizeof(struct rspi_data));
748 if (master == NULL) {
749 dev_err(&pdev->dev, "spi_alloc_master error.\n");
750 return -ENOMEM;
751 }
752
753 rspi = spi_master_get_devdata(master);
754 dev_set_drvdata(&pdev->dev, rspi);
755
756 rspi->master = master;
757 rspi->addr = ioremap(res->start, resource_size(res));
758 if (rspi->addr == NULL) {
759 dev_err(&pdev->dev, "ioremap error.\n");
760 ret = -ENOMEM;
761 goto error1;
762 }
763
764 snprintf(clk_name, sizeof(clk_name), "rspi%d", pdev->id);
765 rspi->clk = clk_get(&pdev->dev, clk_name);
766 if (IS_ERR(rspi->clk)) {
767 dev_err(&pdev->dev, "cannot get clock\n");
768 ret = PTR_ERR(rspi->clk);
769 goto error2;
770 }
771 clk_enable(rspi->clk);
772
773 INIT_LIST_HEAD(&rspi->queue);
774 spin_lock_init(&rspi->lock);
775 INIT_WORK(&rspi->ws, rspi_work);
776 init_waitqueue_head(&rspi->wait);
777
778 master->num_chipselect = 2;
779 master->bus_num = pdev->id;
780 master->setup = rspi_setup;
781 master->transfer = rspi_transfer;
782 master->cleanup = rspi_cleanup;
783
784 ret = request_irq(irq, rspi_irq, 0, dev_name(&pdev->dev), rspi);
785 if (ret < 0) {
786 dev_err(&pdev->dev, "request_irq error\n");
787 goto error3;
788 }
789
790 rspi->irq = irq;
791 rspi_request_dma(rspi, pdev);
792
793 ret = spi_register_master(master);
794 if (ret < 0) {
795 dev_err(&pdev->dev, "spi_register_master error.\n");
796 goto error4;
797 }
798
799 dev_info(&pdev->dev, "probed\n");
800
801 return 0;
802
803error4:
804 rspi_release_dma(rspi);
805 free_irq(irq, rspi);
806error3:
807 clk_put(rspi->clk);
808error2:
809 iounmap(rspi->addr);
810error1:
811 spi_master_put(master);
812
813 return ret;
814}
815
816static struct platform_driver rspi_driver = {
817 .probe = rspi_probe,
818 .remove = __devexit_p(rspi_remove),
819 .driver = {
820 .name = "rspi",
821 .owner = THIS_MODULE,
822 },
823};
824module_platform_driver(rspi_driver);
825
826MODULE_DESCRIPTION("Renesas RSPI bus driver");
827MODULE_LICENSE("GPL v2");
828MODULE_AUTHOR("Yoshihiro Shimoda");
829MODULE_ALIAS("platform:rspi");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * SH RSPI driver
4 *
5 * Copyright (C) 2012, 2013 Renesas Solutions Corp.
6 * Copyright (C) 2014 Glider bvba
7 *
8 * Based on spi-sh.c:
9 * Copyright (C) 2011 Renesas Solutions Corp.
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/errno.h>
16#include <linux/interrupt.h>
17#include <linux/platform_device.h>
18#include <linux/io.h>
19#include <linux/clk.h>
20#include <linux/dmaengine.h>
21#include <linux/dma-mapping.h>
22#include <linux/of_device.h>
23#include <linux/pm_runtime.h>
24#include <linux/sh_dma.h>
25#include <linux/spi/spi.h>
26#include <linux/spi/rspi.h>
27
28#define RSPI_SPCR 0x00 /* Control Register */
29#define RSPI_SSLP 0x01 /* Slave Select Polarity Register */
30#define RSPI_SPPCR 0x02 /* Pin Control Register */
31#define RSPI_SPSR 0x03 /* Status Register */
32#define RSPI_SPDR 0x04 /* Data Register */
33#define RSPI_SPSCR 0x08 /* Sequence Control Register */
34#define RSPI_SPSSR 0x09 /* Sequence Status Register */
35#define RSPI_SPBR 0x0a /* Bit Rate Register */
36#define RSPI_SPDCR 0x0b /* Data Control Register */
37#define RSPI_SPCKD 0x0c /* Clock Delay Register */
38#define RSPI_SSLND 0x0d /* Slave Select Negation Delay Register */
39#define RSPI_SPND 0x0e /* Next-Access Delay Register */
40#define RSPI_SPCR2 0x0f /* Control Register 2 (SH only) */
41#define RSPI_SPCMD0 0x10 /* Command Register 0 */
42#define RSPI_SPCMD1 0x12 /* Command Register 1 */
43#define RSPI_SPCMD2 0x14 /* Command Register 2 */
44#define RSPI_SPCMD3 0x16 /* Command Register 3 */
45#define RSPI_SPCMD4 0x18 /* Command Register 4 */
46#define RSPI_SPCMD5 0x1a /* Command Register 5 */
47#define RSPI_SPCMD6 0x1c /* Command Register 6 */
48#define RSPI_SPCMD7 0x1e /* Command Register 7 */
49#define RSPI_SPCMD(i) (RSPI_SPCMD0 + (i) * 2)
50#define RSPI_NUM_SPCMD 8
51#define RSPI_RZ_NUM_SPCMD 4
52#define QSPI_NUM_SPCMD 4
53
54/* RSPI on RZ only */
55#define RSPI_SPBFCR 0x20 /* Buffer Control Register */
56#define RSPI_SPBFDR 0x22 /* Buffer Data Count Setting Register */
57
58/* QSPI only */
59#define QSPI_SPBFCR 0x18 /* Buffer Control Register */
60#define QSPI_SPBDCR 0x1a /* Buffer Data Count Register */
61#define QSPI_SPBMUL0 0x1c /* Transfer Data Length Multiplier Setting Register 0 */
62#define QSPI_SPBMUL1 0x20 /* Transfer Data Length Multiplier Setting Register 1 */
63#define QSPI_SPBMUL2 0x24 /* Transfer Data Length Multiplier Setting Register 2 */
64#define QSPI_SPBMUL3 0x28 /* Transfer Data Length Multiplier Setting Register 3 */
65#define QSPI_SPBMUL(i) (QSPI_SPBMUL0 + (i) * 4)
66
67/* SPCR - Control Register */
68#define SPCR_SPRIE 0x80 /* Receive Interrupt Enable */
69#define SPCR_SPE 0x40 /* Function Enable */
70#define SPCR_SPTIE 0x20 /* Transmit Interrupt Enable */
71#define SPCR_SPEIE 0x10 /* Error Interrupt Enable */
72#define SPCR_MSTR 0x08 /* Master/Slave Mode Select */
73#define SPCR_MODFEN 0x04 /* Mode Fault Error Detection Enable */
74/* RSPI on SH only */
75#define SPCR_TXMD 0x02 /* TX Only Mode (vs. Full Duplex) */
76#define SPCR_SPMS 0x01 /* 3-wire Mode (vs. 4-wire) */
77/* QSPI on R-Car Gen2 only */
78#define SPCR_WSWAP 0x02 /* Word Swap of read-data for DMAC */
79#define SPCR_BSWAP 0x01 /* Byte Swap of read-data for DMAC */
80
81/* SSLP - Slave Select Polarity Register */
82#define SSLP_SSL1P 0x02 /* SSL1 Signal Polarity Setting */
83#define SSLP_SSL0P 0x01 /* SSL0 Signal Polarity Setting */
84
85/* SPPCR - Pin Control Register */
86#define SPPCR_MOIFE 0x20 /* MOSI Idle Value Fixing Enable */
87#define SPPCR_MOIFV 0x10 /* MOSI Idle Fixed Value */
88#define SPPCR_SPOM 0x04
89#define SPPCR_SPLP2 0x02 /* Loopback Mode 2 (non-inverting) */
90#define SPPCR_SPLP 0x01 /* Loopback Mode (inverting) */
91
92#define SPPCR_IO3FV 0x04 /* Single-/Dual-SPI Mode IO3 Output Fixed Value */
93#define SPPCR_IO2FV 0x04 /* Single-/Dual-SPI Mode IO2 Output Fixed Value */
94
95/* SPSR - Status Register */
96#define SPSR_SPRF 0x80 /* Receive Buffer Full Flag */
97#define SPSR_TEND 0x40 /* Transmit End */
98#define SPSR_SPTEF 0x20 /* Transmit Buffer Empty Flag */
99#define SPSR_PERF 0x08 /* Parity Error Flag */
100#define SPSR_MODF 0x04 /* Mode Fault Error Flag */
101#define SPSR_IDLNF 0x02 /* RSPI Idle Flag */
102#define SPSR_OVRF 0x01 /* Overrun Error Flag (RSPI only) */
103
104/* SPSCR - Sequence Control Register */
105#define SPSCR_SPSLN_MASK 0x07 /* Sequence Length Specification */
106
107/* SPSSR - Sequence Status Register */
108#define SPSSR_SPECM_MASK 0x70 /* Command Error Mask */
109#define SPSSR_SPCP_MASK 0x07 /* Command Pointer Mask */
110
111/* SPDCR - Data Control Register */
112#define SPDCR_TXDMY 0x80 /* Dummy Data Transmission Enable */
113#define SPDCR_SPLW1 0x40 /* Access Width Specification (RZ) */
114#define SPDCR_SPLW0 0x20 /* Access Width Specification (RZ) */
115#define SPDCR_SPLLWORD (SPDCR_SPLW1 | SPDCR_SPLW0)
116#define SPDCR_SPLWORD SPDCR_SPLW1
117#define SPDCR_SPLBYTE SPDCR_SPLW0
118#define SPDCR_SPLW 0x20 /* Access Width Specification (SH) */
119#define SPDCR_SPRDTD 0x10 /* Receive Transmit Data Select (SH) */
120#define SPDCR_SLSEL1 0x08
121#define SPDCR_SLSEL0 0x04
122#define SPDCR_SLSEL_MASK 0x0c /* SSL1 Output Select (SH) */
123#define SPDCR_SPFC1 0x02
124#define SPDCR_SPFC0 0x01
125#define SPDCR_SPFC_MASK 0x03 /* Frame Count Setting (1-4) (SH) */
126
127/* SPCKD - Clock Delay Register */
128#define SPCKD_SCKDL_MASK 0x07 /* Clock Delay Setting (1-8) */
129
130/* SSLND - Slave Select Negation Delay Register */
131#define SSLND_SLNDL_MASK 0x07 /* SSL Negation Delay Setting (1-8) */
132
133/* SPND - Next-Access Delay Register */
134#define SPND_SPNDL_MASK 0x07 /* Next-Access Delay Setting (1-8) */
135
136/* SPCR2 - Control Register 2 */
137#define SPCR2_PTE 0x08 /* Parity Self-Test Enable */
138#define SPCR2_SPIE 0x04 /* Idle Interrupt Enable */
139#define SPCR2_SPOE 0x02 /* Odd Parity Enable (vs. Even) */
140#define SPCR2_SPPE 0x01 /* Parity Enable */
141
142/* SPCMDn - Command Registers */
143#define SPCMD_SCKDEN 0x8000 /* Clock Delay Setting Enable */
144#define SPCMD_SLNDEN 0x4000 /* SSL Negation Delay Setting Enable */
145#define SPCMD_SPNDEN 0x2000 /* Next-Access Delay Enable */
146#define SPCMD_LSBF 0x1000 /* LSB First */
147#define SPCMD_SPB_MASK 0x0f00 /* Data Length Setting */
148#define SPCMD_SPB_8_TO_16(bit) (((bit - 1) << 8) & SPCMD_SPB_MASK)
149#define SPCMD_SPB_8BIT 0x0000 /* QSPI only */
150#define SPCMD_SPB_16BIT 0x0100
151#define SPCMD_SPB_20BIT 0x0000
152#define SPCMD_SPB_24BIT 0x0100
153#define SPCMD_SPB_32BIT 0x0200
154#define SPCMD_SSLKP 0x0080 /* SSL Signal Level Keeping */
155#define SPCMD_SPIMOD_MASK 0x0060 /* SPI Operating Mode (QSPI only) */
156#define SPCMD_SPIMOD1 0x0040
157#define SPCMD_SPIMOD0 0x0020
158#define SPCMD_SPIMOD_SINGLE 0
159#define SPCMD_SPIMOD_DUAL SPCMD_SPIMOD0
160#define SPCMD_SPIMOD_QUAD SPCMD_SPIMOD1
161#define SPCMD_SPRW 0x0010 /* SPI Read/Write Access (Dual/Quad) */
162#define SPCMD_SSLA_MASK 0x0030 /* SSL Assert Signal Setting (RSPI) */
163#define SPCMD_BRDV_MASK 0x000c /* Bit Rate Division Setting */
164#define SPCMD_CPOL 0x0002 /* Clock Polarity Setting */
165#define SPCMD_CPHA 0x0001 /* Clock Phase Setting */
166
167/* SPBFCR - Buffer Control Register */
168#define SPBFCR_TXRST 0x80 /* Transmit Buffer Data Reset */
169#define SPBFCR_RXRST 0x40 /* Receive Buffer Data Reset */
170#define SPBFCR_TXTRG_MASK 0x30 /* Transmit Buffer Data Triggering Number */
171#define SPBFCR_RXTRG_MASK 0x07 /* Receive Buffer Data Triggering Number */
172/* QSPI on R-Car Gen2 */
173#define SPBFCR_TXTRG_1B 0x00 /* 31 bytes (1 byte available) */
174#define SPBFCR_TXTRG_32B 0x30 /* 0 byte (32 bytes available) */
175#define SPBFCR_RXTRG_1B 0x00 /* 1 byte (31 bytes available) */
176#define SPBFCR_RXTRG_32B 0x07 /* 32 bytes (0 byte available) */
177
178#define QSPI_BUFFER_SIZE 32u
179
180struct rspi_data {
181 void __iomem *addr;
182 u32 max_speed_hz;
183 struct spi_controller *ctlr;
184 wait_queue_head_t wait;
185 struct clk *clk;
186 u16 spcmd;
187 u8 spsr;
188 u8 sppcr;
189 int rx_irq, tx_irq;
190 const struct spi_ops *ops;
191
192 unsigned dma_callbacked:1;
193 unsigned byte_access:1;
194};
195
196static void rspi_write8(const struct rspi_data *rspi, u8 data, u16 offset)
197{
198 iowrite8(data, rspi->addr + offset);
199}
200
201static void rspi_write16(const struct rspi_data *rspi, u16 data, u16 offset)
202{
203 iowrite16(data, rspi->addr + offset);
204}
205
206static void rspi_write32(const struct rspi_data *rspi, u32 data, u16 offset)
207{
208 iowrite32(data, rspi->addr + offset);
209}
210
211static u8 rspi_read8(const struct rspi_data *rspi, u16 offset)
212{
213 return ioread8(rspi->addr + offset);
214}
215
216static u16 rspi_read16(const struct rspi_data *rspi, u16 offset)
217{
218 return ioread16(rspi->addr + offset);
219}
220
221static void rspi_write_data(const struct rspi_data *rspi, u16 data)
222{
223 if (rspi->byte_access)
224 rspi_write8(rspi, data, RSPI_SPDR);
225 else /* 16 bit */
226 rspi_write16(rspi, data, RSPI_SPDR);
227}
228
229static u16 rspi_read_data(const struct rspi_data *rspi)
230{
231 if (rspi->byte_access)
232 return rspi_read8(rspi, RSPI_SPDR);
233 else /* 16 bit */
234 return rspi_read16(rspi, RSPI_SPDR);
235}
236
237/* optional functions */
238struct spi_ops {
239 int (*set_config_register)(struct rspi_data *rspi, int access_size);
240 int (*transfer_one)(struct spi_controller *ctlr,
241 struct spi_device *spi, struct spi_transfer *xfer);
242 u16 mode_bits;
243 u16 flags;
244 u16 fifo_size;
245};
246
247/*
248 * functions for RSPI on legacy SH
249 */
250static int rspi_set_config_register(struct rspi_data *rspi, int access_size)
251{
252 int spbr;
253
254 /* Sets output mode, MOSI signal, and (optionally) loopback */
255 rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
256
257 /* Sets transfer bit rate */
258 spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk),
259 2 * rspi->max_speed_hz) - 1;
260 rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
261
262 /* Disable dummy transmission, set 16-bit word access, 1 frame */
263 rspi_write8(rspi, 0, RSPI_SPDCR);
264 rspi->byte_access = 0;
265
266 /* Sets RSPCK, SSL, next-access delay value */
267 rspi_write8(rspi, 0x00, RSPI_SPCKD);
268 rspi_write8(rspi, 0x00, RSPI_SSLND);
269 rspi_write8(rspi, 0x00, RSPI_SPND);
270
271 /* Sets parity, interrupt mask */
272 rspi_write8(rspi, 0x00, RSPI_SPCR2);
273
274 /* Resets sequencer */
275 rspi_write8(rspi, 0, RSPI_SPSCR);
276 rspi->spcmd |= SPCMD_SPB_8_TO_16(access_size);
277 rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
278
279 /* Sets RSPI mode */
280 rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR);
281
282 return 0;
283}
284
285/*
286 * functions for RSPI on RZ
287 */
288static int rspi_rz_set_config_register(struct rspi_data *rspi, int access_size)
289{
290 int spbr;
291 int div = 0;
292 unsigned long clksrc;
293
294 /* Sets output mode, MOSI signal, and (optionally) loopback */
295 rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
296
297 clksrc = clk_get_rate(rspi->clk);
298 while (div < 3) {
299 if (rspi->max_speed_hz >= clksrc/4) /* 4=(CLK/2)/2 */
300 break;
301 div++;
302 clksrc /= 2;
303 }
304
305 /* Sets transfer bit rate */
306 spbr = DIV_ROUND_UP(clksrc, 2 * rspi->max_speed_hz) - 1;
307 rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
308 rspi->spcmd |= div << 2;
309
310 /* Disable dummy transmission, set byte access */
311 rspi_write8(rspi, SPDCR_SPLBYTE, RSPI_SPDCR);
312 rspi->byte_access = 1;
313
314 /* Sets RSPCK, SSL, next-access delay value */
315 rspi_write8(rspi, 0x00, RSPI_SPCKD);
316 rspi_write8(rspi, 0x00, RSPI_SSLND);
317 rspi_write8(rspi, 0x00, RSPI_SPND);
318
319 /* Resets sequencer */
320 rspi_write8(rspi, 0, RSPI_SPSCR);
321 rspi->spcmd |= SPCMD_SPB_8_TO_16(access_size);
322 rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
323
324 /* Sets RSPI mode */
325 rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR);
326
327 return 0;
328}
329
330/*
331 * functions for QSPI
332 */
333static int qspi_set_config_register(struct rspi_data *rspi, int access_size)
334{
335 int spbr;
336
337 /* Sets output mode, MOSI signal, and (optionally) loopback */
338 rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
339
340 /* Sets transfer bit rate */
341 spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk), 2 * rspi->max_speed_hz);
342 rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
343
344 /* Disable dummy transmission, set byte access */
345 rspi_write8(rspi, 0, RSPI_SPDCR);
346 rspi->byte_access = 1;
347
348 /* Sets RSPCK, SSL, next-access delay value */
349 rspi_write8(rspi, 0x00, RSPI_SPCKD);
350 rspi_write8(rspi, 0x00, RSPI_SSLND);
351 rspi_write8(rspi, 0x00, RSPI_SPND);
352
353 /* Data Length Setting */
354 if (access_size == 8)
355 rspi->spcmd |= SPCMD_SPB_8BIT;
356 else if (access_size == 16)
357 rspi->spcmd |= SPCMD_SPB_16BIT;
358 else
359 rspi->spcmd |= SPCMD_SPB_32BIT;
360
361 rspi->spcmd |= SPCMD_SCKDEN | SPCMD_SLNDEN | SPCMD_SPNDEN;
362
363 /* Resets transfer data length */
364 rspi_write32(rspi, 0, QSPI_SPBMUL0);
365
366 /* Resets transmit and receive buffer */
367 rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, QSPI_SPBFCR);
368 /* Sets buffer to allow normal operation */
369 rspi_write8(rspi, 0x00, QSPI_SPBFCR);
370
371 /* Resets sequencer */
372 rspi_write8(rspi, 0, RSPI_SPSCR);
373 rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
374
375 /* Sets RSPI mode */
376 rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR);
377
378 return 0;
379}
380
381static void qspi_update(const struct rspi_data *rspi, u8 mask, u8 val, u8 reg)
382{
383 u8 data;
384
385 data = rspi_read8(rspi, reg);
386 data &= ~mask;
387 data |= (val & mask);
388 rspi_write8(rspi, data, reg);
389}
390
391static unsigned int qspi_set_send_trigger(struct rspi_data *rspi,
392 unsigned int len)
393{
394 unsigned int n;
395
396 n = min(len, QSPI_BUFFER_SIZE);
397
398 if (len >= QSPI_BUFFER_SIZE) {
399 /* sets triggering number to 32 bytes */
400 qspi_update(rspi, SPBFCR_TXTRG_MASK,
401 SPBFCR_TXTRG_32B, QSPI_SPBFCR);
402 } else {
403 /* sets triggering number to 1 byte */
404 qspi_update(rspi, SPBFCR_TXTRG_MASK,
405 SPBFCR_TXTRG_1B, QSPI_SPBFCR);
406 }
407
408 return n;
409}
410
411static int qspi_set_receive_trigger(struct rspi_data *rspi, unsigned int len)
412{
413 unsigned int n;
414
415 n = min(len, QSPI_BUFFER_SIZE);
416
417 if (len >= QSPI_BUFFER_SIZE) {
418 /* sets triggering number to 32 bytes */
419 qspi_update(rspi, SPBFCR_RXTRG_MASK,
420 SPBFCR_RXTRG_32B, QSPI_SPBFCR);
421 } else {
422 /* sets triggering number to 1 byte */
423 qspi_update(rspi, SPBFCR_RXTRG_MASK,
424 SPBFCR_RXTRG_1B, QSPI_SPBFCR);
425 }
426 return n;
427}
428
429#define set_config_register(spi, n) spi->ops->set_config_register(spi, n)
430
431static void rspi_enable_irq(const struct rspi_data *rspi, u8 enable)
432{
433 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | enable, RSPI_SPCR);
434}
435
436static void rspi_disable_irq(const struct rspi_data *rspi, u8 disable)
437{
438 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~disable, RSPI_SPCR);
439}
440
441static int rspi_wait_for_interrupt(struct rspi_data *rspi, u8 wait_mask,
442 u8 enable_bit)
443{
444 int ret;
445
446 rspi->spsr = rspi_read8(rspi, RSPI_SPSR);
447 if (rspi->spsr & wait_mask)
448 return 0;
449
450 rspi_enable_irq(rspi, enable_bit);
451 ret = wait_event_timeout(rspi->wait, rspi->spsr & wait_mask, HZ);
452 if (ret == 0 && !(rspi->spsr & wait_mask))
453 return -ETIMEDOUT;
454
455 return 0;
456}
457
458static inline int rspi_wait_for_tx_empty(struct rspi_data *rspi)
459{
460 return rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE);
461}
462
463static inline int rspi_wait_for_rx_full(struct rspi_data *rspi)
464{
465 return rspi_wait_for_interrupt(rspi, SPSR_SPRF, SPCR_SPRIE);
466}
467
468static int rspi_data_out(struct rspi_data *rspi, u8 data)
469{
470 int error = rspi_wait_for_tx_empty(rspi);
471 if (error < 0) {
472 dev_err(&rspi->ctlr->dev, "transmit timeout\n");
473 return error;
474 }
475 rspi_write_data(rspi, data);
476 return 0;
477}
478
479static int rspi_data_in(struct rspi_data *rspi)
480{
481 int error;
482 u8 data;
483
484 error = rspi_wait_for_rx_full(rspi);
485 if (error < 0) {
486 dev_err(&rspi->ctlr->dev, "receive timeout\n");
487 return error;
488 }
489 data = rspi_read_data(rspi);
490 return data;
491}
492
493static int rspi_pio_transfer(struct rspi_data *rspi, const u8 *tx, u8 *rx,
494 unsigned int n)
495{
496 while (n-- > 0) {
497 if (tx) {
498 int ret = rspi_data_out(rspi, *tx++);
499 if (ret < 0)
500 return ret;
501 }
502 if (rx) {
503 int ret = rspi_data_in(rspi);
504 if (ret < 0)
505 return ret;
506 *rx++ = ret;
507 }
508 }
509
510 return 0;
511}
512
513static void rspi_dma_complete(void *arg)
514{
515 struct rspi_data *rspi = arg;
516
517 rspi->dma_callbacked = 1;
518 wake_up_interruptible(&rspi->wait);
519}
520
521static int rspi_dma_transfer(struct rspi_data *rspi, struct sg_table *tx,
522 struct sg_table *rx)
523{
524 struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL;
525 u8 irq_mask = 0;
526 unsigned int other_irq = 0;
527 dma_cookie_t cookie;
528 int ret;
529
530 /* First prepare and submit the DMA request(s), as this may fail */
531 if (rx) {
532 desc_rx = dmaengine_prep_slave_sg(rspi->ctlr->dma_rx, rx->sgl,
533 rx->nents, DMA_DEV_TO_MEM,
534 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
535 if (!desc_rx) {
536 ret = -EAGAIN;
537 goto no_dma_rx;
538 }
539
540 desc_rx->callback = rspi_dma_complete;
541 desc_rx->callback_param = rspi;
542 cookie = dmaengine_submit(desc_rx);
543 if (dma_submit_error(cookie)) {
544 ret = cookie;
545 goto no_dma_rx;
546 }
547
548 irq_mask |= SPCR_SPRIE;
549 }
550
551 if (tx) {
552 desc_tx = dmaengine_prep_slave_sg(rspi->ctlr->dma_tx, tx->sgl,
553 tx->nents, DMA_MEM_TO_DEV,
554 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
555 if (!desc_tx) {
556 ret = -EAGAIN;
557 goto no_dma_tx;
558 }
559
560 if (rx) {
561 /* No callback */
562 desc_tx->callback = NULL;
563 } else {
564 desc_tx->callback = rspi_dma_complete;
565 desc_tx->callback_param = rspi;
566 }
567 cookie = dmaengine_submit(desc_tx);
568 if (dma_submit_error(cookie)) {
569 ret = cookie;
570 goto no_dma_tx;
571 }
572
573 irq_mask |= SPCR_SPTIE;
574 }
575
576 /*
577 * DMAC needs SPxIE, but if SPxIE is set, the IRQ routine will be
578 * called. So, this driver disables the IRQ while DMA transfer.
579 */
580 if (tx)
581 disable_irq(other_irq = rspi->tx_irq);
582 if (rx && rspi->rx_irq != other_irq)
583 disable_irq(rspi->rx_irq);
584
585 rspi_enable_irq(rspi, irq_mask);
586 rspi->dma_callbacked = 0;
587
588 /* Now start DMA */
589 if (rx)
590 dma_async_issue_pending(rspi->ctlr->dma_rx);
591 if (tx)
592 dma_async_issue_pending(rspi->ctlr->dma_tx);
593
594 ret = wait_event_interruptible_timeout(rspi->wait,
595 rspi->dma_callbacked, HZ);
596 if (ret > 0 && rspi->dma_callbacked) {
597 ret = 0;
598 } else {
599 if (!ret) {
600 dev_err(&rspi->ctlr->dev, "DMA timeout\n");
601 ret = -ETIMEDOUT;
602 }
603 if (tx)
604 dmaengine_terminate_all(rspi->ctlr->dma_tx);
605 if (rx)
606 dmaengine_terminate_all(rspi->ctlr->dma_rx);
607 }
608
609 rspi_disable_irq(rspi, irq_mask);
610
611 if (tx)
612 enable_irq(rspi->tx_irq);
613 if (rx && rspi->rx_irq != other_irq)
614 enable_irq(rspi->rx_irq);
615
616 return ret;
617
618no_dma_tx:
619 if (rx)
620 dmaengine_terminate_all(rspi->ctlr->dma_rx);
621no_dma_rx:
622 if (ret == -EAGAIN) {
623 pr_warn_once("%s %s: DMA not available, falling back to PIO\n",
624 dev_driver_string(&rspi->ctlr->dev),
625 dev_name(&rspi->ctlr->dev));
626 }
627 return ret;
628}
629
630static void rspi_receive_init(const struct rspi_data *rspi)
631{
632 u8 spsr;
633
634 spsr = rspi_read8(rspi, RSPI_SPSR);
635 if (spsr & SPSR_SPRF)
636 rspi_read_data(rspi); /* dummy read */
637 if (spsr & SPSR_OVRF)
638 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPSR) & ~SPSR_OVRF,
639 RSPI_SPSR);
640}
641
642static void rspi_rz_receive_init(const struct rspi_data *rspi)
643{
644 rspi_receive_init(rspi);
645 rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, RSPI_SPBFCR);
646 rspi_write8(rspi, 0, RSPI_SPBFCR);
647}
648
649static void qspi_receive_init(const struct rspi_data *rspi)
650{
651 u8 spsr;
652
653 spsr = rspi_read8(rspi, RSPI_SPSR);
654 if (spsr & SPSR_SPRF)
655 rspi_read_data(rspi); /* dummy read */
656 rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, QSPI_SPBFCR);
657 rspi_write8(rspi, 0, QSPI_SPBFCR);
658}
659
660static bool __rspi_can_dma(const struct rspi_data *rspi,
661 const struct spi_transfer *xfer)
662{
663 return xfer->len > rspi->ops->fifo_size;
664}
665
666static bool rspi_can_dma(struct spi_controller *ctlr, struct spi_device *spi,
667 struct spi_transfer *xfer)
668{
669 struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
670
671 return __rspi_can_dma(rspi, xfer);
672}
673
674static int rspi_dma_check_then_transfer(struct rspi_data *rspi,
675 struct spi_transfer *xfer)
676{
677 if (!rspi->ctlr->can_dma || !__rspi_can_dma(rspi, xfer))
678 return -EAGAIN;
679
680 /* rx_buf can be NULL on RSPI on SH in TX-only Mode */
681 return rspi_dma_transfer(rspi, &xfer->tx_sg,
682 xfer->rx_buf ? &xfer->rx_sg : NULL);
683}
684
685static int rspi_common_transfer(struct rspi_data *rspi,
686 struct spi_transfer *xfer)
687{
688 int ret;
689
690 ret = rspi_dma_check_then_transfer(rspi, xfer);
691 if (ret != -EAGAIN)
692 return ret;
693
694 ret = rspi_pio_transfer(rspi, xfer->tx_buf, xfer->rx_buf, xfer->len);
695 if (ret < 0)
696 return ret;
697
698 /* Wait for the last transmission */
699 rspi_wait_for_tx_empty(rspi);
700
701 return 0;
702}
703
704static int rspi_transfer_one(struct spi_controller *ctlr,
705 struct spi_device *spi, struct spi_transfer *xfer)
706{
707 struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
708 u8 spcr;
709
710 spcr = rspi_read8(rspi, RSPI_SPCR);
711 if (xfer->rx_buf) {
712 rspi_receive_init(rspi);
713 spcr &= ~SPCR_TXMD;
714 } else {
715 spcr |= SPCR_TXMD;
716 }
717 rspi_write8(rspi, spcr, RSPI_SPCR);
718
719 return rspi_common_transfer(rspi, xfer);
720}
721
722static int rspi_rz_transfer_one(struct spi_controller *ctlr,
723 struct spi_device *spi,
724 struct spi_transfer *xfer)
725{
726 struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
727
728 rspi_rz_receive_init(rspi);
729
730 return rspi_common_transfer(rspi, xfer);
731}
732
733static int qspi_trigger_transfer_out_in(struct rspi_data *rspi, const u8 *tx,
734 u8 *rx, unsigned int len)
735{
736 unsigned int i, n;
737 int ret;
738
739 while (len > 0) {
740 n = qspi_set_send_trigger(rspi, len);
741 qspi_set_receive_trigger(rspi, len);
742 ret = rspi_wait_for_tx_empty(rspi);
743 if (ret < 0) {
744 dev_err(&rspi->ctlr->dev, "transmit timeout\n");
745 return ret;
746 }
747 for (i = 0; i < n; i++)
748 rspi_write_data(rspi, *tx++);
749
750 ret = rspi_wait_for_rx_full(rspi);
751 if (ret < 0) {
752 dev_err(&rspi->ctlr->dev, "receive timeout\n");
753 return ret;
754 }
755 for (i = 0; i < n; i++)
756 *rx++ = rspi_read_data(rspi);
757
758 len -= n;
759 }
760
761 return 0;
762}
763
764static int qspi_transfer_out_in(struct rspi_data *rspi,
765 struct spi_transfer *xfer)
766{
767 int ret;
768
769 qspi_receive_init(rspi);
770
771 ret = rspi_dma_check_then_transfer(rspi, xfer);
772 if (ret != -EAGAIN)
773 return ret;
774
775 return qspi_trigger_transfer_out_in(rspi, xfer->tx_buf,
776 xfer->rx_buf, xfer->len);
777}
778
779static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)
780{
781 const u8 *tx = xfer->tx_buf;
782 unsigned int n = xfer->len;
783 unsigned int i, len;
784 int ret;
785
786 if (rspi->ctlr->can_dma && __rspi_can_dma(rspi, xfer)) {
787 ret = rspi_dma_transfer(rspi, &xfer->tx_sg, NULL);
788 if (ret != -EAGAIN)
789 return ret;
790 }
791
792 while (n > 0) {
793 len = qspi_set_send_trigger(rspi, n);
794 ret = rspi_wait_for_tx_empty(rspi);
795 if (ret < 0) {
796 dev_err(&rspi->ctlr->dev, "transmit timeout\n");
797 return ret;
798 }
799 for (i = 0; i < len; i++)
800 rspi_write_data(rspi, *tx++);
801
802 n -= len;
803 }
804
805 /* Wait for the last transmission */
806 rspi_wait_for_tx_empty(rspi);
807
808 return 0;
809}
810
811static int qspi_transfer_in(struct rspi_data *rspi, struct spi_transfer *xfer)
812{
813 u8 *rx = xfer->rx_buf;
814 unsigned int n = xfer->len;
815 unsigned int i, len;
816 int ret;
817
818 if (rspi->ctlr->can_dma && __rspi_can_dma(rspi, xfer)) {
819 int ret = rspi_dma_transfer(rspi, NULL, &xfer->rx_sg);
820 if (ret != -EAGAIN)
821 return ret;
822 }
823
824 while (n > 0) {
825 len = qspi_set_receive_trigger(rspi, n);
826 ret = rspi_wait_for_rx_full(rspi);
827 if (ret < 0) {
828 dev_err(&rspi->ctlr->dev, "receive timeout\n");
829 return ret;
830 }
831 for (i = 0; i < len; i++)
832 *rx++ = rspi_read_data(rspi);
833
834 n -= len;
835 }
836
837 return 0;
838}
839
840static int qspi_transfer_one(struct spi_controller *ctlr,
841 struct spi_device *spi, struct spi_transfer *xfer)
842{
843 struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
844
845 if (spi->mode & SPI_LOOP) {
846 return qspi_transfer_out_in(rspi, xfer);
847 } else if (xfer->tx_nbits > SPI_NBITS_SINGLE) {
848 /* Quad or Dual SPI Write */
849 return qspi_transfer_out(rspi, xfer);
850 } else if (xfer->rx_nbits > SPI_NBITS_SINGLE) {
851 /* Quad or Dual SPI Read */
852 return qspi_transfer_in(rspi, xfer);
853 } else {
854 /* Single SPI Transfer */
855 return qspi_transfer_out_in(rspi, xfer);
856 }
857}
858
859static u16 qspi_transfer_mode(const struct spi_transfer *xfer)
860{
861 if (xfer->tx_buf)
862 switch (xfer->tx_nbits) {
863 case SPI_NBITS_QUAD:
864 return SPCMD_SPIMOD_QUAD;
865 case SPI_NBITS_DUAL:
866 return SPCMD_SPIMOD_DUAL;
867 default:
868 return 0;
869 }
870 if (xfer->rx_buf)
871 switch (xfer->rx_nbits) {
872 case SPI_NBITS_QUAD:
873 return SPCMD_SPIMOD_QUAD | SPCMD_SPRW;
874 case SPI_NBITS_DUAL:
875 return SPCMD_SPIMOD_DUAL | SPCMD_SPRW;
876 default:
877 return 0;
878 }
879
880 return 0;
881}
882
883static int qspi_setup_sequencer(struct rspi_data *rspi,
884 const struct spi_message *msg)
885{
886 const struct spi_transfer *xfer;
887 unsigned int i = 0, len = 0;
888 u16 current_mode = 0xffff, mode;
889
890 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
891 mode = qspi_transfer_mode(xfer);
892 if (mode == current_mode) {
893 len += xfer->len;
894 continue;
895 }
896
897 /* Transfer mode change */
898 if (i) {
899 /* Set transfer data length of previous transfer */
900 rspi_write32(rspi, len, QSPI_SPBMUL(i - 1));
901 }
902
903 if (i >= QSPI_NUM_SPCMD) {
904 dev_err(&msg->spi->dev,
905 "Too many different transfer modes");
906 return -EINVAL;
907 }
908
909 /* Program transfer mode for this transfer */
910 rspi_write16(rspi, rspi->spcmd | mode, RSPI_SPCMD(i));
911 current_mode = mode;
912 len = xfer->len;
913 i++;
914 }
915 if (i) {
916 /* Set final transfer data length and sequence length */
917 rspi_write32(rspi, len, QSPI_SPBMUL(i - 1));
918 rspi_write8(rspi, i - 1, RSPI_SPSCR);
919 }
920
921 return 0;
922}
923
924static int rspi_prepare_message(struct spi_controller *ctlr,
925 struct spi_message *msg)
926{
927 struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
928 struct spi_device *spi = msg->spi;
929 int ret;
930
931 rspi->max_speed_hz = spi->max_speed_hz;
932
933 rspi->spcmd = SPCMD_SSLKP;
934 if (spi->mode & SPI_CPOL)
935 rspi->spcmd |= SPCMD_CPOL;
936 if (spi->mode & SPI_CPHA)
937 rspi->spcmd |= SPCMD_CPHA;
938
939 /* CMOS output mode and MOSI signal from previous transfer */
940 rspi->sppcr = 0;
941 if (spi->mode & SPI_LOOP)
942 rspi->sppcr |= SPPCR_SPLP;
943
944 set_config_register(rspi, 8);
945
946 if (msg->spi->mode &
947 (SPI_TX_DUAL | SPI_TX_QUAD | SPI_RX_DUAL | SPI_RX_QUAD)) {
948 /* Setup sequencer for messages with multiple transfer modes */
949 ret = qspi_setup_sequencer(rspi, msg);
950 if (ret < 0)
951 return ret;
952 }
953
954 /* Enable SPI function in master mode */
955 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_SPE, RSPI_SPCR);
956 return 0;
957}
958
959static int rspi_unprepare_message(struct spi_controller *ctlr,
960 struct spi_message *msg)
961{
962 struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
963
964 /* Disable SPI function */
965 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_SPE, RSPI_SPCR);
966
967 /* Reset sequencer for Single SPI Transfers */
968 rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
969 rspi_write8(rspi, 0, RSPI_SPSCR);
970 return 0;
971}
972
973static irqreturn_t rspi_irq_mux(int irq, void *_sr)
974{
975 struct rspi_data *rspi = _sr;
976 u8 spsr;
977 irqreturn_t ret = IRQ_NONE;
978 u8 disable_irq = 0;
979
980 rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR);
981 if (spsr & SPSR_SPRF)
982 disable_irq |= SPCR_SPRIE;
983 if (spsr & SPSR_SPTEF)
984 disable_irq |= SPCR_SPTIE;
985
986 if (disable_irq) {
987 ret = IRQ_HANDLED;
988 rspi_disable_irq(rspi, disable_irq);
989 wake_up(&rspi->wait);
990 }
991
992 return ret;
993}
994
995static irqreturn_t rspi_irq_rx(int irq, void *_sr)
996{
997 struct rspi_data *rspi = _sr;
998 u8 spsr;
999
1000 rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR);
1001 if (spsr & SPSR_SPRF) {
1002 rspi_disable_irq(rspi, SPCR_SPRIE);
1003 wake_up(&rspi->wait);
1004 return IRQ_HANDLED;
1005 }
1006
1007 return 0;
1008}
1009
1010static irqreturn_t rspi_irq_tx(int irq, void *_sr)
1011{
1012 struct rspi_data *rspi = _sr;
1013 u8 spsr;
1014
1015 rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR);
1016 if (spsr & SPSR_SPTEF) {
1017 rspi_disable_irq(rspi, SPCR_SPTIE);
1018 wake_up(&rspi->wait);
1019 return IRQ_HANDLED;
1020 }
1021
1022 return 0;
1023}
1024
1025static struct dma_chan *rspi_request_dma_chan(struct device *dev,
1026 enum dma_transfer_direction dir,
1027 unsigned int id,
1028 dma_addr_t port_addr)
1029{
1030 dma_cap_mask_t mask;
1031 struct dma_chan *chan;
1032 struct dma_slave_config cfg;
1033 int ret;
1034
1035 dma_cap_zero(mask);
1036 dma_cap_set(DMA_SLAVE, mask);
1037
1038 chan = dma_request_slave_channel_compat(mask, shdma_chan_filter,
1039 (void *)(unsigned long)id, dev,
1040 dir == DMA_MEM_TO_DEV ? "tx" : "rx");
1041 if (!chan) {
1042 dev_warn(dev, "dma_request_slave_channel_compat failed\n");
1043 return NULL;
1044 }
1045
1046 memset(&cfg, 0, sizeof(cfg));
1047 cfg.direction = dir;
1048 if (dir == DMA_MEM_TO_DEV) {
1049 cfg.dst_addr = port_addr;
1050 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
1051 } else {
1052 cfg.src_addr = port_addr;
1053 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
1054 }
1055
1056 ret = dmaengine_slave_config(chan, &cfg);
1057 if (ret) {
1058 dev_warn(dev, "dmaengine_slave_config failed %d\n", ret);
1059 dma_release_channel(chan);
1060 return NULL;
1061 }
1062
1063 return chan;
1064}
1065
1066static int rspi_request_dma(struct device *dev, struct spi_controller *ctlr,
1067 const struct resource *res)
1068{
1069 const struct rspi_plat_data *rspi_pd = dev_get_platdata(dev);
1070 unsigned int dma_tx_id, dma_rx_id;
1071
1072 if (dev->of_node) {
1073 /* In the OF case we will get the slave IDs from the DT */
1074 dma_tx_id = 0;
1075 dma_rx_id = 0;
1076 } else if (rspi_pd && rspi_pd->dma_tx_id && rspi_pd->dma_rx_id) {
1077 dma_tx_id = rspi_pd->dma_tx_id;
1078 dma_rx_id = rspi_pd->dma_rx_id;
1079 } else {
1080 /* The driver assumes no error. */
1081 return 0;
1082 }
1083
1084 ctlr->dma_tx = rspi_request_dma_chan(dev, DMA_MEM_TO_DEV, dma_tx_id,
1085 res->start + RSPI_SPDR);
1086 if (!ctlr->dma_tx)
1087 return -ENODEV;
1088
1089 ctlr->dma_rx = rspi_request_dma_chan(dev, DMA_DEV_TO_MEM, dma_rx_id,
1090 res->start + RSPI_SPDR);
1091 if (!ctlr->dma_rx) {
1092 dma_release_channel(ctlr->dma_tx);
1093 ctlr->dma_tx = NULL;
1094 return -ENODEV;
1095 }
1096
1097 ctlr->can_dma = rspi_can_dma;
1098 dev_info(dev, "DMA available");
1099 return 0;
1100}
1101
1102static void rspi_release_dma(struct spi_controller *ctlr)
1103{
1104 if (ctlr->dma_tx)
1105 dma_release_channel(ctlr->dma_tx);
1106 if (ctlr->dma_rx)
1107 dma_release_channel(ctlr->dma_rx);
1108}
1109
1110static int rspi_remove(struct platform_device *pdev)
1111{
1112 struct rspi_data *rspi = platform_get_drvdata(pdev);
1113
1114 rspi_release_dma(rspi->ctlr);
1115 pm_runtime_disable(&pdev->dev);
1116
1117 return 0;
1118}
1119
1120static const struct spi_ops rspi_ops = {
1121 .set_config_register = rspi_set_config_register,
1122 .transfer_one = rspi_transfer_one,
1123 .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP,
1124 .flags = SPI_CONTROLLER_MUST_TX,
1125 .fifo_size = 8,
1126};
1127
1128static const struct spi_ops rspi_rz_ops = {
1129 .set_config_register = rspi_rz_set_config_register,
1130 .transfer_one = rspi_rz_transfer_one,
1131 .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP,
1132 .flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX,
1133 .fifo_size = 8, /* 8 for TX, 32 for RX */
1134};
1135
1136static const struct spi_ops qspi_ops = {
1137 .set_config_register = qspi_set_config_register,
1138 .transfer_one = qspi_transfer_one,
1139 .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP |
1140 SPI_TX_DUAL | SPI_TX_QUAD |
1141 SPI_RX_DUAL | SPI_RX_QUAD,
1142 .flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX,
1143 .fifo_size = 32,
1144};
1145
1146#ifdef CONFIG_OF
1147static const struct of_device_id rspi_of_match[] = {
1148 /* RSPI on legacy SH */
1149 { .compatible = "renesas,rspi", .data = &rspi_ops },
1150 /* RSPI on RZ/A1H */
1151 { .compatible = "renesas,rspi-rz", .data = &rspi_rz_ops },
1152 /* QSPI on R-Car Gen2 */
1153 { .compatible = "renesas,qspi", .data = &qspi_ops },
1154 { /* sentinel */ }
1155};
1156
1157MODULE_DEVICE_TABLE(of, rspi_of_match);
1158
1159static int rspi_parse_dt(struct device *dev, struct spi_controller *ctlr)
1160{
1161 u32 num_cs;
1162 int error;
1163
1164 /* Parse DT properties */
1165 error = of_property_read_u32(dev->of_node, "num-cs", &num_cs);
1166 if (error) {
1167 dev_err(dev, "of_property_read_u32 num-cs failed %d\n", error);
1168 return error;
1169 }
1170
1171 ctlr->num_chipselect = num_cs;
1172 return 0;
1173}
1174#else
1175#define rspi_of_match NULL
1176static inline int rspi_parse_dt(struct device *dev, struct spi_controller *ctlr)
1177{
1178 return -EINVAL;
1179}
1180#endif /* CONFIG_OF */
1181
1182static int rspi_request_irq(struct device *dev, unsigned int irq,
1183 irq_handler_t handler, const char *suffix,
1184 void *dev_id)
1185{
1186 const char *name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s",
1187 dev_name(dev), suffix);
1188 if (!name)
1189 return -ENOMEM;
1190
1191 return devm_request_irq(dev, irq, handler, 0, name, dev_id);
1192}
1193
1194static int rspi_probe(struct platform_device *pdev)
1195{
1196 struct resource *res;
1197 struct spi_controller *ctlr;
1198 struct rspi_data *rspi;
1199 int ret;
1200 const struct rspi_plat_data *rspi_pd;
1201 const struct spi_ops *ops;
1202
1203 ctlr = spi_alloc_master(&pdev->dev, sizeof(struct rspi_data));
1204 if (ctlr == NULL)
1205 return -ENOMEM;
1206
1207 ops = of_device_get_match_data(&pdev->dev);
1208 if (ops) {
1209 ret = rspi_parse_dt(&pdev->dev, ctlr);
1210 if (ret)
1211 goto error1;
1212 } else {
1213 ops = (struct spi_ops *)pdev->id_entry->driver_data;
1214 rspi_pd = dev_get_platdata(&pdev->dev);
1215 if (rspi_pd && rspi_pd->num_chipselect)
1216 ctlr->num_chipselect = rspi_pd->num_chipselect;
1217 else
1218 ctlr->num_chipselect = 2; /* default */
1219 }
1220
1221 /* ops parameter check */
1222 if (!ops->set_config_register) {
1223 dev_err(&pdev->dev, "there is no set_config_register\n");
1224 ret = -ENODEV;
1225 goto error1;
1226 }
1227
1228 rspi = spi_controller_get_devdata(ctlr);
1229 platform_set_drvdata(pdev, rspi);
1230 rspi->ops = ops;
1231 rspi->ctlr = ctlr;
1232
1233 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1234 rspi->addr = devm_ioremap_resource(&pdev->dev, res);
1235 if (IS_ERR(rspi->addr)) {
1236 ret = PTR_ERR(rspi->addr);
1237 goto error1;
1238 }
1239
1240 rspi->clk = devm_clk_get(&pdev->dev, NULL);
1241 if (IS_ERR(rspi->clk)) {
1242 dev_err(&pdev->dev, "cannot get clock\n");
1243 ret = PTR_ERR(rspi->clk);
1244 goto error1;
1245 }
1246
1247 pm_runtime_enable(&pdev->dev);
1248
1249 init_waitqueue_head(&rspi->wait);
1250
1251 ctlr->bus_num = pdev->id;
1252 ctlr->auto_runtime_pm = true;
1253 ctlr->transfer_one = ops->transfer_one;
1254 ctlr->prepare_message = rspi_prepare_message;
1255 ctlr->unprepare_message = rspi_unprepare_message;
1256 ctlr->mode_bits = ops->mode_bits;
1257 ctlr->flags = ops->flags;
1258 ctlr->dev.of_node = pdev->dev.of_node;
1259
1260 ret = platform_get_irq_byname(pdev, "rx");
1261 if (ret < 0) {
1262 ret = platform_get_irq_byname(pdev, "mux");
1263 if (ret < 0)
1264 ret = platform_get_irq(pdev, 0);
1265 if (ret >= 0)
1266 rspi->rx_irq = rspi->tx_irq = ret;
1267 } else {
1268 rspi->rx_irq = ret;
1269 ret = platform_get_irq_byname(pdev, "tx");
1270 if (ret >= 0)
1271 rspi->tx_irq = ret;
1272 }
1273 if (ret < 0) {
1274 dev_err(&pdev->dev, "platform_get_irq error\n");
1275 goto error2;
1276 }
1277
1278 if (rspi->rx_irq == rspi->tx_irq) {
1279 /* Single multiplexed interrupt */
1280 ret = rspi_request_irq(&pdev->dev, rspi->rx_irq, rspi_irq_mux,
1281 "mux", rspi);
1282 } else {
1283 /* Multi-interrupt mode, only SPRI and SPTI are used */
1284 ret = rspi_request_irq(&pdev->dev, rspi->rx_irq, rspi_irq_rx,
1285 "rx", rspi);
1286 if (!ret)
1287 ret = rspi_request_irq(&pdev->dev, rspi->tx_irq,
1288 rspi_irq_tx, "tx", rspi);
1289 }
1290 if (ret < 0) {
1291 dev_err(&pdev->dev, "request_irq error\n");
1292 goto error2;
1293 }
1294
1295 ret = rspi_request_dma(&pdev->dev, ctlr, res);
1296 if (ret < 0)
1297 dev_warn(&pdev->dev, "DMA not available, using PIO\n");
1298
1299 ret = devm_spi_register_controller(&pdev->dev, ctlr);
1300 if (ret < 0) {
1301 dev_err(&pdev->dev, "devm_spi_register_controller error.\n");
1302 goto error3;
1303 }
1304
1305 dev_info(&pdev->dev, "probed\n");
1306
1307 return 0;
1308
1309error3:
1310 rspi_release_dma(ctlr);
1311error2:
1312 pm_runtime_disable(&pdev->dev);
1313error1:
1314 spi_controller_put(ctlr);
1315
1316 return ret;
1317}
1318
1319static const struct platform_device_id spi_driver_ids[] = {
1320 { "rspi", (kernel_ulong_t)&rspi_ops },
1321 { "rspi-rz", (kernel_ulong_t)&rspi_rz_ops },
1322 { "qspi", (kernel_ulong_t)&qspi_ops },
1323 {},
1324};
1325
1326MODULE_DEVICE_TABLE(platform, spi_driver_ids);
1327
1328#ifdef CONFIG_PM_SLEEP
1329static int rspi_suspend(struct device *dev)
1330{
1331 struct rspi_data *rspi = dev_get_drvdata(dev);
1332
1333 return spi_controller_suspend(rspi->ctlr);
1334}
1335
1336static int rspi_resume(struct device *dev)
1337{
1338 struct rspi_data *rspi = dev_get_drvdata(dev);
1339
1340 return spi_controller_resume(rspi->ctlr);
1341}
1342
1343static SIMPLE_DEV_PM_OPS(rspi_pm_ops, rspi_suspend, rspi_resume);
1344#define DEV_PM_OPS &rspi_pm_ops
1345#else
1346#define DEV_PM_OPS NULL
1347#endif /* CONFIG_PM_SLEEP */
1348
1349static struct platform_driver rspi_driver = {
1350 .probe = rspi_probe,
1351 .remove = rspi_remove,
1352 .id_table = spi_driver_ids,
1353 .driver = {
1354 .name = "renesas_spi",
1355 .pm = DEV_PM_OPS,
1356 .of_match_table = of_match_ptr(rspi_of_match),
1357 },
1358};
1359module_platform_driver(rspi_driver);
1360
1361MODULE_DESCRIPTION("Renesas RSPI bus driver");
1362MODULE_LICENSE("GPL v2");
1363MODULE_AUTHOR("Yoshihiro Shimoda");
1364MODULE_ALIAS("platform:rspi");