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1/*
2 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
3 * Author: Addy Ke <addy.ke@rock-chips.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 */
15
16#include <linux/clk.h>
17#include <linux/dmaengine.h>
18#include <linux/module.h>
19#include <linux/of.h>
20#include <linux/platform_device.h>
21#include <linux/spi/spi.h>
22#include <linux/pm_runtime.h>
23#include <linux/scatterlist.h>
24
25#define DRIVER_NAME "rockchip-spi"
26
27/* SPI register offsets */
28#define ROCKCHIP_SPI_CTRLR0 0x0000
29#define ROCKCHIP_SPI_CTRLR1 0x0004
30#define ROCKCHIP_SPI_SSIENR 0x0008
31#define ROCKCHIP_SPI_SER 0x000c
32#define ROCKCHIP_SPI_BAUDR 0x0010
33#define ROCKCHIP_SPI_TXFTLR 0x0014
34#define ROCKCHIP_SPI_RXFTLR 0x0018
35#define ROCKCHIP_SPI_TXFLR 0x001c
36#define ROCKCHIP_SPI_RXFLR 0x0020
37#define ROCKCHIP_SPI_SR 0x0024
38#define ROCKCHIP_SPI_IPR 0x0028
39#define ROCKCHIP_SPI_IMR 0x002c
40#define ROCKCHIP_SPI_ISR 0x0030
41#define ROCKCHIP_SPI_RISR 0x0034
42#define ROCKCHIP_SPI_ICR 0x0038
43#define ROCKCHIP_SPI_DMACR 0x003c
44#define ROCKCHIP_SPI_DMATDLR 0x0040
45#define ROCKCHIP_SPI_DMARDLR 0x0044
46#define ROCKCHIP_SPI_TXDR 0x0400
47#define ROCKCHIP_SPI_RXDR 0x0800
48
49/* Bit fields in CTRLR0 */
50#define CR0_DFS_OFFSET 0
51
52#define CR0_CFS_OFFSET 2
53
54#define CR0_SCPH_OFFSET 6
55
56#define CR0_SCPOL_OFFSET 7
57
58#define CR0_CSM_OFFSET 8
59#define CR0_CSM_KEEP 0x0
60/* ss_n be high for half sclk_out cycles */
61#define CR0_CSM_HALF 0X1
62/* ss_n be high for one sclk_out cycle */
63#define CR0_CSM_ONE 0x2
64
65/* ss_n to sclk_out delay */
66#define CR0_SSD_OFFSET 10
67/*
68 * The period between ss_n active and
69 * sclk_out active is half sclk_out cycles
70 */
71#define CR0_SSD_HALF 0x0
72/*
73 * The period between ss_n active and
74 * sclk_out active is one sclk_out cycle
75 */
76#define CR0_SSD_ONE 0x1
77
78#define CR0_EM_OFFSET 11
79#define CR0_EM_LITTLE 0x0
80#define CR0_EM_BIG 0x1
81
82#define CR0_FBM_OFFSET 12
83#define CR0_FBM_MSB 0x0
84#define CR0_FBM_LSB 0x1
85
86#define CR0_BHT_OFFSET 13
87#define CR0_BHT_16BIT 0x0
88#define CR0_BHT_8BIT 0x1
89
90#define CR0_RSD_OFFSET 14
91
92#define CR0_FRF_OFFSET 16
93#define CR0_FRF_SPI 0x0
94#define CR0_FRF_SSP 0x1
95#define CR0_FRF_MICROWIRE 0x2
96
97#define CR0_XFM_OFFSET 18
98#define CR0_XFM_MASK (0x03 << SPI_XFM_OFFSET)
99#define CR0_XFM_TR 0x0
100#define CR0_XFM_TO 0x1
101#define CR0_XFM_RO 0x2
102
103#define CR0_OPM_OFFSET 20
104#define CR0_OPM_MASTER 0x0
105#define CR0_OPM_SLAVE 0x1
106
107#define CR0_MTM_OFFSET 0x21
108
109/* Bit fields in SER, 2bit */
110#define SER_MASK 0x3
111
112/* Bit fields in SR, 5bit */
113#define SR_MASK 0x1f
114#define SR_BUSY (1 << 0)
115#define SR_TF_FULL (1 << 1)
116#define SR_TF_EMPTY (1 << 2)
117#define SR_RF_EMPTY (1 << 3)
118#define SR_RF_FULL (1 << 4)
119
120/* Bit fields in ISR, IMR, ISR, RISR, 5bit */
121#define INT_MASK 0x1f
122#define INT_TF_EMPTY (1 << 0)
123#define INT_TF_OVERFLOW (1 << 1)
124#define INT_RF_UNDERFLOW (1 << 2)
125#define INT_RF_OVERFLOW (1 << 3)
126#define INT_RF_FULL (1 << 4)
127
128/* Bit fields in ICR, 4bit */
129#define ICR_MASK 0x0f
130#define ICR_ALL (1 << 0)
131#define ICR_RF_UNDERFLOW (1 << 1)
132#define ICR_RF_OVERFLOW (1 << 2)
133#define ICR_TF_OVERFLOW (1 << 3)
134
135/* Bit fields in DMACR */
136#define RF_DMA_EN (1 << 0)
137#define TF_DMA_EN (1 << 1)
138
139#define RXBUSY (1 << 0)
140#define TXBUSY (1 << 1)
141
142/* sclk_out: spi master internal logic in rk3x can support 50Mhz */
143#define MAX_SCLK_OUT 50000000
144
145/*
146 * SPI_CTRLR1 is 16-bits, so we should support lengths of 0xffff + 1. However,
147 * the controller seems to hang when given 0x10000, so stick with this for now.
148 */
149#define ROCKCHIP_SPI_MAX_TRANLEN 0xffff
150
151enum rockchip_ssi_type {
152 SSI_MOTO_SPI = 0,
153 SSI_TI_SSP,
154 SSI_NS_MICROWIRE,
155};
156
157struct rockchip_spi_dma_data {
158 struct dma_chan *ch;
159 enum dma_transfer_direction direction;
160 dma_addr_t addr;
161};
162
163struct rockchip_spi {
164 struct device *dev;
165 struct spi_master *master;
166
167 struct clk *spiclk;
168 struct clk *apb_pclk;
169
170 void __iomem *regs;
171 /*depth of the FIFO buffer */
172 u32 fifo_len;
173 /* max bus freq supported */
174 u32 max_freq;
175 /* supported slave numbers */
176 enum rockchip_ssi_type type;
177
178 u16 mode;
179 u8 tmode;
180 u8 bpw;
181 u8 n_bytes;
182 u32 rsd_nsecs;
183 unsigned len;
184 u32 speed;
185
186 const void *tx;
187 const void *tx_end;
188 void *rx;
189 void *rx_end;
190
191 u32 state;
192 /* protect state */
193 spinlock_t lock;
194
195 u32 use_dma;
196 struct sg_table tx_sg;
197 struct sg_table rx_sg;
198 struct rockchip_spi_dma_data dma_rx;
199 struct rockchip_spi_dma_data dma_tx;
200 struct dma_slave_caps dma_caps;
201};
202
203static inline void spi_enable_chip(struct rockchip_spi *rs, int enable)
204{
205 writel_relaxed((enable ? 1 : 0), rs->regs + ROCKCHIP_SPI_SSIENR);
206}
207
208static inline void spi_set_clk(struct rockchip_spi *rs, u16 div)
209{
210 writel_relaxed(div, rs->regs + ROCKCHIP_SPI_BAUDR);
211}
212
213static inline void flush_fifo(struct rockchip_spi *rs)
214{
215 while (readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR))
216 readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
217}
218
219static inline void wait_for_idle(struct rockchip_spi *rs)
220{
221 unsigned long timeout = jiffies + msecs_to_jiffies(5);
222
223 do {
224 if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY))
225 return;
226 } while (!time_after(jiffies, timeout));
227
228 dev_warn(rs->dev, "spi controller is in busy state!\n");
229}
230
231static u32 get_fifo_len(struct rockchip_spi *rs)
232{
233 u32 fifo;
234
235 for (fifo = 2; fifo < 32; fifo++) {
236 writel_relaxed(fifo, rs->regs + ROCKCHIP_SPI_TXFTLR);
237 if (fifo != readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFTLR))
238 break;
239 }
240
241 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_TXFTLR);
242
243 return (fifo == 31) ? 0 : fifo;
244}
245
246static inline u32 tx_max(struct rockchip_spi *rs)
247{
248 u32 tx_left, tx_room;
249
250 tx_left = (rs->tx_end - rs->tx) / rs->n_bytes;
251 tx_room = rs->fifo_len - readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFLR);
252
253 return min(tx_left, tx_room);
254}
255
256static inline u32 rx_max(struct rockchip_spi *rs)
257{
258 u32 rx_left = (rs->rx_end - rs->rx) / rs->n_bytes;
259 u32 rx_room = (u32)readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
260
261 return min(rx_left, rx_room);
262}
263
264static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
265{
266 u32 ser;
267 struct spi_master *master = spi->master;
268 struct rockchip_spi *rs = spi_master_get_devdata(master);
269
270 pm_runtime_get_sync(rs->dev);
271
272 ser = readl_relaxed(rs->regs + ROCKCHIP_SPI_SER) & SER_MASK;
273
274 /*
275 * drivers/spi/spi.c:
276 * static void spi_set_cs(struct spi_device *spi, bool enable)
277 * {
278 * if (spi->mode & SPI_CS_HIGH)
279 * enable = !enable;
280 *
281 * if (spi->cs_gpio >= 0)
282 * gpio_set_value(spi->cs_gpio, !enable);
283 * else if (spi->master->set_cs)
284 * spi->master->set_cs(spi, !enable);
285 * }
286 *
287 * Note: enable(rockchip_spi_set_cs) = !enable(spi_set_cs)
288 */
289 if (!enable)
290 ser |= 1 << spi->chip_select;
291 else
292 ser &= ~(1 << spi->chip_select);
293
294 writel_relaxed(ser, rs->regs + ROCKCHIP_SPI_SER);
295
296 pm_runtime_put_sync(rs->dev);
297}
298
299static int rockchip_spi_prepare_message(struct spi_master *master,
300 struct spi_message *msg)
301{
302 struct rockchip_spi *rs = spi_master_get_devdata(master);
303 struct spi_device *spi = msg->spi;
304
305 rs->mode = spi->mode;
306
307 return 0;
308}
309
310static void rockchip_spi_handle_err(struct spi_master *master,
311 struct spi_message *msg)
312{
313 unsigned long flags;
314 struct rockchip_spi *rs = spi_master_get_devdata(master);
315
316 spin_lock_irqsave(&rs->lock, flags);
317
318 /*
319 * For DMA mode, we need terminate DMA channel and flush
320 * fifo for the next transfer if DMA thansfer timeout.
321 * handle_err() was called by core if transfer failed.
322 * Maybe it is reasonable for error handling here.
323 */
324 if (rs->use_dma) {
325 if (rs->state & RXBUSY) {
326 dmaengine_terminate_async(rs->dma_rx.ch);
327 flush_fifo(rs);
328 }
329
330 if (rs->state & TXBUSY)
331 dmaengine_terminate_async(rs->dma_tx.ch);
332 }
333
334 spin_unlock_irqrestore(&rs->lock, flags);
335}
336
337static int rockchip_spi_unprepare_message(struct spi_master *master,
338 struct spi_message *msg)
339{
340 struct rockchip_spi *rs = spi_master_get_devdata(master);
341
342 spi_enable_chip(rs, 0);
343
344 return 0;
345}
346
347static void rockchip_spi_pio_writer(struct rockchip_spi *rs)
348{
349 u32 max = tx_max(rs);
350 u32 txw = 0;
351
352 while (max--) {
353 if (rs->n_bytes == 1)
354 txw = *(u8 *)(rs->tx);
355 else
356 txw = *(u16 *)(rs->tx);
357
358 writel_relaxed(txw, rs->regs + ROCKCHIP_SPI_TXDR);
359 rs->tx += rs->n_bytes;
360 }
361}
362
363static void rockchip_spi_pio_reader(struct rockchip_spi *rs)
364{
365 u32 max = rx_max(rs);
366 u32 rxw;
367
368 while (max--) {
369 rxw = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
370 if (rs->n_bytes == 1)
371 *(u8 *)(rs->rx) = (u8)rxw;
372 else
373 *(u16 *)(rs->rx) = (u16)rxw;
374 rs->rx += rs->n_bytes;
375 }
376}
377
378static int rockchip_spi_pio_transfer(struct rockchip_spi *rs)
379{
380 int remain = 0;
381
382 do {
383 if (rs->tx) {
384 remain = rs->tx_end - rs->tx;
385 rockchip_spi_pio_writer(rs);
386 }
387
388 if (rs->rx) {
389 remain = rs->rx_end - rs->rx;
390 rockchip_spi_pio_reader(rs);
391 }
392
393 cpu_relax();
394 } while (remain);
395
396 /* If tx, wait until the FIFO data completely. */
397 if (rs->tx)
398 wait_for_idle(rs);
399
400 spi_enable_chip(rs, 0);
401
402 return 0;
403}
404
405static void rockchip_spi_dma_rxcb(void *data)
406{
407 unsigned long flags;
408 struct rockchip_spi *rs = data;
409
410 spin_lock_irqsave(&rs->lock, flags);
411
412 rs->state &= ~RXBUSY;
413 if (!(rs->state & TXBUSY)) {
414 spi_enable_chip(rs, 0);
415 spi_finalize_current_transfer(rs->master);
416 }
417
418 spin_unlock_irqrestore(&rs->lock, flags);
419}
420
421static void rockchip_spi_dma_txcb(void *data)
422{
423 unsigned long flags;
424 struct rockchip_spi *rs = data;
425
426 /* Wait until the FIFO data completely. */
427 wait_for_idle(rs);
428
429 spin_lock_irqsave(&rs->lock, flags);
430
431 rs->state &= ~TXBUSY;
432 if (!(rs->state & RXBUSY)) {
433 spi_enable_chip(rs, 0);
434 spi_finalize_current_transfer(rs->master);
435 }
436
437 spin_unlock_irqrestore(&rs->lock, flags);
438}
439
440static int rockchip_spi_prepare_dma(struct rockchip_spi *rs)
441{
442 unsigned long flags;
443 struct dma_slave_config rxconf, txconf;
444 struct dma_async_tx_descriptor *rxdesc, *txdesc;
445
446 spin_lock_irqsave(&rs->lock, flags);
447 rs->state &= ~RXBUSY;
448 rs->state &= ~TXBUSY;
449 spin_unlock_irqrestore(&rs->lock, flags);
450
451 rxdesc = NULL;
452 if (rs->rx) {
453 rxconf.direction = rs->dma_rx.direction;
454 rxconf.src_addr = rs->dma_rx.addr;
455 rxconf.src_addr_width = rs->n_bytes;
456 if (rs->dma_caps.max_burst > 4)
457 rxconf.src_maxburst = 4;
458 else
459 rxconf.src_maxburst = 1;
460 dmaengine_slave_config(rs->dma_rx.ch, &rxconf);
461
462 rxdesc = dmaengine_prep_slave_sg(
463 rs->dma_rx.ch,
464 rs->rx_sg.sgl, rs->rx_sg.nents,
465 rs->dma_rx.direction, DMA_PREP_INTERRUPT);
466 if (!rxdesc)
467 return -EINVAL;
468
469 rxdesc->callback = rockchip_spi_dma_rxcb;
470 rxdesc->callback_param = rs;
471 }
472
473 txdesc = NULL;
474 if (rs->tx) {
475 txconf.direction = rs->dma_tx.direction;
476 txconf.dst_addr = rs->dma_tx.addr;
477 txconf.dst_addr_width = rs->n_bytes;
478 if (rs->dma_caps.max_burst > 4)
479 txconf.dst_maxburst = 4;
480 else
481 txconf.dst_maxburst = 1;
482 dmaengine_slave_config(rs->dma_tx.ch, &txconf);
483
484 txdesc = dmaengine_prep_slave_sg(
485 rs->dma_tx.ch,
486 rs->tx_sg.sgl, rs->tx_sg.nents,
487 rs->dma_tx.direction, DMA_PREP_INTERRUPT);
488 if (!txdesc) {
489 if (rxdesc)
490 dmaengine_terminate_sync(rs->dma_rx.ch);
491 return -EINVAL;
492 }
493
494 txdesc->callback = rockchip_spi_dma_txcb;
495 txdesc->callback_param = rs;
496 }
497
498 /* rx must be started before tx due to spi instinct */
499 if (rxdesc) {
500 spin_lock_irqsave(&rs->lock, flags);
501 rs->state |= RXBUSY;
502 spin_unlock_irqrestore(&rs->lock, flags);
503 dmaengine_submit(rxdesc);
504 dma_async_issue_pending(rs->dma_rx.ch);
505 }
506
507 if (txdesc) {
508 spin_lock_irqsave(&rs->lock, flags);
509 rs->state |= TXBUSY;
510 spin_unlock_irqrestore(&rs->lock, flags);
511 dmaengine_submit(txdesc);
512 dma_async_issue_pending(rs->dma_tx.ch);
513 }
514
515 return 0;
516}
517
518static void rockchip_spi_config(struct rockchip_spi *rs)
519{
520 u32 div = 0;
521 u32 dmacr = 0;
522 int rsd = 0;
523
524 u32 cr0 = (CR0_BHT_8BIT << CR0_BHT_OFFSET)
525 | (CR0_SSD_ONE << CR0_SSD_OFFSET)
526 | (CR0_EM_BIG << CR0_EM_OFFSET);
527
528 cr0 |= (rs->n_bytes << CR0_DFS_OFFSET);
529 cr0 |= ((rs->mode & 0x3) << CR0_SCPH_OFFSET);
530 cr0 |= (rs->tmode << CR0_XFM_OFFSET);
531 cr0 |= (rs->type << CR0_FRF_OFFSET);
532
533 if (rs->use_dma) {
534 if (rs->tx)
535 dmacr |= TF_DMA_EN;
536 if (rs->rx)
537 dmacr |= RF_DMA_EN;
538 }
539
540 if (WARN_ON(rs->speed > MAX_SCLK_OUT))
541 rs->speed = MAX_SCLK_OUT;
542
543 /* the minimum divisor is 2 */
544 if (rs->max_freq < 2 * rs->speed) {
545 clk_set_rate(rs->spiclk, 2 * rs->speed);
546 rs->max_freq = clk_get_rate(rs->spiclk);
547 }
548
549 /* div doesn't support odd number */
550 div = DIV_ROUND_UP(rs->max_freq, rs->speed);
551 div = (div + 1) & 0xfffe;
552
553 /* Rx sample delay is expressed in parent clock cycles (max 3) */
554 rsd = DIV_ROUND_CLOSEST(rs->rsd_nsecs * (rs->max_freq >> 8),
555 1000000000 >> 8);
556 if (!rsd && rs->rsd_nsecs) {
557 pr_warn_once("rockchip-spi: %u Hz are too slow to express %u ns delay\n",
558 rs->max_freq, rs->rsd_nsecs);
559 } else if (rsd > 3) {
560 rsd = 3;
561 pr_warn_once("rockchip-spi: %u Hz are too fast to express %u ns delay, clamping at %u ns\n",
562 rs->max_freq, rs->rsd_nsecs,
563 rsd * 1000000000U / rs->max_freq);
564 }
565 cr0 |= rsd << CR0_RSD_OFFSET;
566
567 writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0);
568
569 writel_relaxed(rs->len - 1, rs->regs + ROCKCHIP_SPI_CTRLR1);
570 writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_TXFTLR);
571 writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
572
573 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMATDLR);
574 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMARDLR);
575 writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR);
576
577 spi_set_clk(rs, div);
578
579 dev_dbg(rs->dev, "cr0 0x%x, div %d\n", cr0, div);
580}
581
582static size_t rockchip_spi_max_transfer_size(struct spi_device *spi)
583{
584 return ROCKCHIP_SPI_MAX_TRANLEN;
585}
586
587static int rockchip_spi_transfer_one(
588 struct spi_master *master,
589 struct spi_device *spi,
590 struct spi_transfer *xfer)
591{
592 int ret = 0;
593 struct rockchip_spi *rs = spi_master_get_devdata(master);
594
595 WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) &&
596 (readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY));
597
598 if (!xfer->tx_buf && !xfer->rx_buf) {
599 dev_err(rs->dev, "No buffer for transfer\n");
600 return -EINVAL;
601 }
602
603 if (xfer->len > ROCKCHIP_SPI_MAX_TRANLEN) {
604 dev_err(rs->dev, "Transfer is too long (%d)\n", xfer->len);
605 return -EINVAL;
606 }
607
608 rs->speed = xfer->speed_hz;
609 rs->bpw = xfer->bits_per_word;
610 rs->n_bytes = rs->bpw >> 3;
611
612 rs->tx = xfer->tx_buf;
613 rs->tx_end = rs->tx + xfer->len;
614 rs->rx = xfer->rx_buf;
615 rs->rx_end = rs->rx + xfer->len;
616 rs->len = xfer->len;
617
618 rs->tx_sg = xfer->tx_sg;
619 rs->rx_sg = xfer->rx_sg;
620
621 if (rs->tx && rs->rx)
622 rs->tmode = CR0_XFM_TR;
623 else if (rs->tx)
624 rs->tmode = CR0_XFM_TO;
625 else if (rs->rx)
626 rs->tmode = CR0_XFM_RO;
627
628 /* we need prepare dma before spi was enabled */
629 if (master->can_dma && master->can_dma(master, spi, xfer))
630 rs->use_dma = 1;
631 else
632 rs->use_dma = 0;
633
634 rockchip_spi_config(rs);
635
636 if (rs->use_dma) {
637 if (rs->tmode == CR0_XFM_RO) {
638 /* rx: dma must be prepared first */
639 ret = rockchip_spi_prepare_dma(rs);
640 spi_enable_chip(rs, 1);
641 } else {
642 /* tx or tr: spi must be enabled first */
643 spi_enable_chip(rs, 1);
644 ret = rockchip_spi_prepare_dma(rs);
645 }
646 /* successful DMA prepare means the transfer is in progress */
647 ret = ret ? ret : 1;
648 } else {
649 spi_enable_chip(rs, 1);
650 ret = rockchip_spi_pio_transfer(rs);
651 }
652
653 return ret;
654}
655
656static bool rockchip_spi_can_dma(struct spi_master *master,
657 struct spi_device *spi,
658 struct spi_transfer *xfer)
659{
660 struct rockchip_spi *rs = spi_master_get_devdata(master);
661
662 return (xfer->len > rs->fifo_len);
663}
664
665static int rockchip_spi_probe(struct platform_device *pdev)
666{
667 int ret = 0;
668 struct rockchip_spi *rs;
669 struct spi_master *master;
670 struct resource *mem;
671 u32 rsd_nsecs;
672
673 master = spi_alloc_master(&pdev->dev, sizeof(struct rockchip_spi));
674 if (!master)
675 return -ENOMEM;
676
677 platform_set_drvdata(pdev, master);
678
679 rs = spi_master_get_devdata(master);
680
681 /* Get basic io resource and map it */
682 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
683 rs->regs = devm_ioremap_resource(&pdev->dev, mem);
684 if (IS_ERR(rs->regs)) {
685 ret = PTR_ERR(rs->regs);
686 goto err_ioremap_resource;
687 }
688
689 rs->apb_pclk = devm_clk_get(&pdev->dev, "apb_pclk");
690 if (IS_ERR(rs->apb_pclk)) {
691 dev_err(&pdev->dev, "Failed to get apb_pclk\n");
692 ret = PTR_ERR(rs->apb_pclk);
693 goto err_ioremap_resource;
694 }
695
696 rs->spiclk = devm_clk_get(&pdev->dev, "spiclk");
697 if (IS_ERR(rs->spiclk)) {
698 dev_err(&pdev->dev, "Failed to get spi_pclk\n");
699 ret = PTR_ERR(rs->spiclk);
700 goto err_ioremap_resource;
701 }
702
703 ret = clk_prepare_enable(rs->apb_pclk);
704 if (ret) {
705 dev_err(&pdev->dev, "Failed to enable apb_pclk\n");
706 goto err_ioremap_resource;
707 }
708
709 ret = clk_prepare_enable(rs->spiclk);
710 if (ret) {
711 dev_err(&pdev->dev, "Failed to enable spi_clk\n");
712 goto err_spiclk_enable;
713 }
714
715 spi_enable_chip(rs, 0);
716
717 rs->type = SSI_MOTO_SPI;
718 rs->master = master;
719 rs->dev = &pdev->dev;
720 rs->max_freq = clk_get_rate(rs->spiclk);
721
722 if (!of_property_read_u32(pdev->dev.of_node, "rx-sample-delay-ns",
723 &rsd_nsecs))
724 rs->rsd_nsecs = rsd_nsecs;
725
726 rs->fifo_len = get_fifo_len(rs);
727 if (!rs->fifo_len) {
728 dev_err(&pdev->dev, "Failed to get fifo length\n");
729 ret = -EINVAL;
730 goto err_get_fifo_len;
731 }
732
733 spin_lock_init(&rs->lock);
734
735 pm_runtime_set_active(&pdev->dev);
736 pm_runtime_enable(&pdev->dev);
737
738 master->auto_runtime_pm = true;
739 master->bus_num = pdev->id;
740 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP;
741 master->num_chipselect = 2;
742 master->dev.of_node = pdev->dev.of_node;
743 master->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8);
744
745 master->set_cs = rockchip_spi_set_cs;
746 master->prepare_message = rockchip_spi_prepare_message;
747 master->unprepare_message = rockchip_spi_unprepare_message;
748 master->transfer_one = rockchip_spi_transfer_one;
749 master->max_transfer_size = rockchip_spi_max_transfer_size;
750 master->handle_err = rockchip_spi_handle_err;
751
752 rs->dma_tx.ch = dma_request_chan(rs->dev, "tx");
753 if (IS_ERR(rs->dma_tx.ch)) {
754 /* Check tx to see if we need defer probing driver */
755 if (PTR_ERR(rs->dma_tx.ch) == -EPROBE_DEFER) {
756 ret = -EPROBE_DEFER;
757 goto err_get_fifo_len;
758 }
759 dev_warn(rs->dev, "Failed to request TX DMA channel\n");
760 rs->dma_tx.ch = NULL;
761 }
762
763 rs->dma_rx.ch = dma_request_chan(rs->dev, "rx");
764 if (IS_ERR(rs->dma_rx.ch)) {
765 if (PTR_ERR(rs->dma_rx.ch) == -EPROBE_DEFER) {
766 ret = -EPROBE_DEFER;
767 goto err_free_dma_tx;
768 }
769 dev_warn(rs->dev, "Failed to request RX DMA channel\n");
770 rs->dma_rx.ch = NULL;
771 }
772
773 if (rs->dma_tx.ch && rs->dma_rx.ch) {
774 dma_get_slave_caps(rs->dma_rx.ch, &(rs->dma_caps));
775 rs->dma_tx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_TXDR);
776 rs->dma_rx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_RXDR);
777 rs->dma_tx.direction = DMA_MEM_TO_DEV;
778 rs->dma_rx.direction = DMA_DEV_TO_MEM;
779
780 master->can_dma = rockchip_spi_can_dma;
781 master->dma_tx = rs->dma_tx.ch;
782 master->dma_rx = rs->dma_rx.ch;
783 }
784
785 ret = devm_spi_register_master(&pdev->dev, master);
786 if (ret) {
787 dev_err(&pdev->dev, "Failed to register master\n");
788 goto err_register_master;
789 }
790
791 return 0;
792
793err_register_master:
794 pm_runtime_disable(&pdev->dev);
795 if (rs->dma_rx.ch)
796 dma_release_channel(rs->dma_rx.ch);
797err_free_dma_tx:
798 if (rs->dma_tx.ch)
799 dma_release_channel(rs->dma_tx.ch);
800err_get_fifo_len:
801 clk_disable_unprepare(rs->spiclk);
802err_spiclk_enable:
803 clk_disable_unprepare(rs->apb_pclk);
804err_ioremap_resource:
805 spi_master_put(master);
806
807 return ret;
808}
809
810static int rockchip_spi_remove(struct platform_device *pdev)
811{
812 struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
813 struct rockchip_spi *rs = spi_master_get_devdata(master);
814
815 pm_runtime_disable(&pdev->dev);
816
817 clk_disable_unprepare(rs->spiclk);
818 clk_disable_unprepare(rs->apb_pclk);
819
820 if (rs->dma_tx.ch)
821 dma_release_channel(rs->dma_tx.ch);
822 if (rs->dma_rx.ch)
823 dma_release_channel(rs->dma_rx.ch);
824
825 spi_master_put(master);
826
827 return 0;
828}
829
830#ifdef CONFIG_PM_SLEEP
831static int rockchip_spi_suspend(struct device *dev)
832{
833 int ret = 0;
834 struct spi_master *master = dev_get_drvdata(dev);
835 struct rockchip_spi *rs = spi_master_get_devdata(master);
836
837 ret = spi_master_suspend(rs->master);
838 if (ret)
839 return ret;
840
841 if (!pm_runtime_suspended(dev)) {
842 clk_disable_unprepare(rs->spiclk);
843 clk_disable_unprepare(rs->apb_pclk);
844 }
845
846 return ret;
847}
848
849static int rockchip_spi_resume(struct device *dev)
850{
851 int ret = 0;
852 struct spi_master *master = dev_get_drvdata(dev);
853 struct rockchip_spi *rs = spi_master_get_devdata(master);
854
855 if (!pm_runtime_suspended(dev)) {
856 ret = clk_prepare_enable(rs->apb_pclk);
857 if (ret < 0)
858 return ret;
859
860 ret = clk_prepare_enable(rs->spiclk);
861 if (ret < 0) {
862 clk_disable_unprepare(rs->apb_pclk);
863 return ret;
864 }
865 }
866
867 ret = spi_master_resume(rs->master);
868 if (ret < 0) {
869 clk_disable_unprepare(rs->spiclk);
870 clk_disable_unprepare(rs->apb_pclk);
871 }
872
873 return ret;
874}
875#endif /* CONFIG_PM_SLEEP */
876
877#ifdef CONFIG_PM
878static int rockchip_spi_runtime_suspend(struct device *dev)
879{
880 struct spi_master *master = dev_get_drvdata(dev);
881 struct rockchip_spi *rs = spi_master_get_devdata(master);
882
883 clk_disable_unprepare(rs->spiclk);
884 clk_disable_unprepare(rs->apb_pclk);
885
886 return 0;
887}
888
889static int rockchip_spi_runtime_resume(struct device *dev)
890{
891 int ret;
892 struct spi_master *master = dev_get_drvdata(dev);
893 struct rockchip_spi *rs = spi_master_get_devdata(master);
894
895 ret = clk_prepare_enable(rs->apb_pclk);
896 if (ret)
897 return ret;
898
899 ret = clk_prepare_enable(rs->spiclk);
900 if (ret)
901 clk_disable_unprepare(rs->apb_pclk);
902
903 return ret;
904}
905#endif /* CONFIG_PM */
906
907static const struct dev_pm_ops rockchip_spi_pm = {
908 SET_SYSTEM_SLEEP_PM_OPS(rockchip_spi_suspend, rockchip_spi_resume)
909 SET_RUNTIME_PM_OPS(rockchip_spi_runtime_suspend,
910 rockchip_spi_runtime_resume, NULL)
911};
912
913static const struct of_device_id rockchip_spi_dt_match[] = {
914 { .compatible = "rockchip,rk3036-spi", },
915 { .compatible = "rockchip,rk3066-spi", },
916 { .compatible = "rockchip,rk3188-spi", },
917 { .compatible = "rockchip,rk3228-spi", },
918 { .compatible = "rockchip,rk3288-spi", },
919 { .compatible = "rockchip,rk3368-spi", },
920 { .compatible = "rockchip,rk3399-spi", },
921 { },
922};
923MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match);
924
925static struct platform_driver rockchip_spi_driver = {
926 .driver = {
927 .name = DRIVER_NAME,
928 .pm = &rockchip_spi_pm,
929 .of_match_table = of_match_ptr(rockchip_spi_dt_match),
930 },
931 .probe = rockchip_spi_probe,
932 .remove = rockchip_spi_remove,
933};
934
935module_platform_driver(rockchip_spi_driver);
936
937MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>");
938MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver");
939MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
4 * Author: Addy Ke <addy.ke@rock-chips.com>
5 */
6
7#include <linux/clk.h>
8#include <linux/dmaengine.h>
9#include <linux/interrupt.h>
10#include <linux/module.h>
11#include <linux/of.h>
12#include <linux/pinctrl/consumer.h>
13#include <linux/platform_device.h>
14#include <linux/spi/spi.h>
15#include <linux/pm_runtime.h>
16#include <linux/scatterlist.h>
17
18#define DRIVER_NAME "rockchip-spi"
19
20#define ROCKCHIP_SPI_CLR_BITS(reg, bits) \
21 writel_relaxed(readl_relaxed(reg) & ~(bits), reg)
22#define ROCKCHIP_SPI_SET_BITS(reg, bits) \
23 writel_relaxed(readl_relaxed(reg) | (bits), reg)
24
25/* SPI register offsets */
26#define ROCKCHIP_SPI_CTRLR0 0x0000
27#define ROCKCHIP_SPI_CTRLR1 0x0004
28#define ROCKCHIP_SPI_SSIENR 0x0008
29#define ROCKCHIP_SPI_SER 0x000c
30#define ROCKCHIP_SPI_BAUDR 0x0010
31#define ROCKCHIP_SPI_TXFTLR 0x0014
32#define ROCKCHIP_SPI_RXFTLR 0x0018
33#define ROCKCHIP_SPI_TXFLR 0x001c
34#define ROCKCHIP_SPI_RXFLR 0x0020
35#define ROCKCHIP_SPI_SR 0x0024
36#define ROCKCHIP_SPI_IPR 0x0028
37#define ROCKCHIP_SPI_IMR 0x002c
38#define ROCKCHIP_SPI_ISR 0x0030
39#define ROCKCHIP_SPI_RISR 0x0034
40#define ROCKCHIP_SPI_ICR 0x0038
41#define ROCKCHIP_SPI_DMACR 0x003c
42#define ROCKCHIP_SPI_DMATDLR 0x0040
43#define ROCKCHIP_SPI_DMARDLR 0x0044
44#define ROCKCHIP_SPI_VERSION 0x0048
45#define ROCKCHIP_SPI_TXDR 0x0400
46#define ROCKCHIP_SPI_RXDR 0x0800
47
48/* Bit fields in CTRLR0 */
49#define CR0_DFS_OFFSET 0
50#define CR0_DFS_4BIT 0x0
51#define CR0_DFS_8BIT 0x1
52#define CR0_DFS_16BIT 0x2
53
54#define CR0_CFS_OFFSET 2
55
56#define CR0_SCPH_OFFSET 6
57
58#define CR0_SCPOL_OFFSET 7
59
60#define CR0_CSM_OFFSET 8
61#define CR0_CSM_KEEP 0x0
62/* ss_n be high for half sclk_out cycles */
63#define CR0_CSM_HALF 0X1
64/* ss_n be high for one sclk_out cycle */
65#define CR0_CSM_ONE 0x2
66
67/* ss_n to sclk_out delay */
68#define CR0_SSD_OFFSET 10
69/*
70 * The period between ss_n active and
71 * sclk_out active is half sclk_out cycles
72 */
73#define CR0_SSD_HALF 0x0
74/*
75 * The period between ss_n active and
76 * sclk_out active is one sclk_out cycle
77 */
78#define CR0_SSD_ONE 0x1
79
80#define CR0_EM_OFFSET 11
81#define CR0_EM_LITTLE 0x0
82#define CR0_EM_BIG 0x1
83
84#define CR0_FBM_OFFSET 12
85#define CR0_FBM_MSB 0x0
86#define CR0_FBM_LSB 0x1
87
88#define CR0_BHT_OFFSET 13
89#define CR0_BHT_16BIT 0x0
90#define CR0_BHT_8BIT 0x1
91
92#define CR0_RSD_OFFSET 14
93#define CR0_RSD_MAX 0x3
94
95#define CR0_FRF_OFFSET 16
96#define CR0_FRF_SPI 0x0
97#define CR0_FRF_SSP 0x1
98#define CR0_FRF_MICROWIRE 0x2
99
100#define CR0_XFM_OFFSET 18
101#define CR0_XFM_MASK (0x03 << SPI_XFM_OFFSET)
102#define CR0_XFM_TR 0x0
103#define CR0_XFM_TO 0x1
104#define CR0_XFM_RO 0x2
105
106#define CR0_OPM_OFFSET 20
107#define CR0_OPM_HOST 0x0
108#define CR0_OPM_TARGET 0x1
109
110#define CR0_SOI_OFFSET 23
111
112#define CR0_MTM_OFFSET 0x21
113
114/* Bit fields in SER, 2bit */
115#define SER_MASK 0x3
116
117/* Bit fields in BAUDR */
118#define BAUDR_SCKDV_MIN 2
119#define BAUDR_SCKDV_MAX 65534
120
121/* Bit fields in SR, 6bit */
122#define SR_MASK 0x3f
123#define SR_BUSY (1 << 0)
124#define SR_TF_FULL (1 << 1)
125#define SR_TF_EMPTY (1 << 2)
126#define SR_RF_EMPTY (1 << 3)
127#define SR_RF_FULL (1 << 4)
128#define SR_TARGET_TX_BUSY (1 << 5)
129
130/* Bit fields in ISR, IMR, ISR, RISR, 5bit */
131#define INT_MASK 0x1f
132#define INT_TF_EMPTY (1 << 0)
133#define INT_TF_OVERFLOW (1 << 1)
134#define INT_RF_UNDERFLOW (1 << 2)
135#define INT_RF_OVERFLOW (1 << 3)
136#define INT_RF_FULL (1 << 4)
137#define INT_CS_INACTIVE (1 << 6)
138
139/* Bit fields in ICR, 4bit */
140#define ICR_MASK 0x0f
141#define ICR_ALL (1 << 0)
142#define ICR_RF_UNDERFLOW (1 << 1)
143#define ICR_RF_OVERFLOW (1 << 2)
144#define ICR_TF_OVERFLOW (1 << 3)
145
146/* Bit fields in DMACR */
147#define RF_DMA_EN (1 << 0)
148#define TF_DMA_EN (1 << 1)
149
150/* Driver state flags */
151#define RXDMA (1 << 0)
152#define TXDMA (1 << 1)
153
154/* sclk_out: spi host internal logic in rk3x can support 50Mhz */
155#define MAX_SCLK_OUT 50000000U
156
157/*
158 * SPI_CTRLR1 is 16-bits, so we should support lengths of 0xffff + 1. However,
159 * the controller seems to hang when given 0x10000, so stick with this for now.
160 */
161#define ROCKCHIP_SPI_MAX_TRANLEN 0xffff
162
163#define ROCKCHIP_SPI_MAX_NATIVE_CS_NUM 2
164#define ROCKCHIP_SPI_VER2_TYPE1 0x05EC0002
165#define ROCKCHIP_SPI_VER2_TYPE2 0x00110002
166
167#define ROCKCHIP_AUTOSUSPEND_TIMEOUT 2000
168
169struct rockchip_spi {
170 struct device *dev;
171
172 struct clk *spiclk;
173 struct clk *apb_pclk;
174
175 void __iomem *regs;
176 dma_addr_t dma_addr_rx;
177 dma_addr_t dma_addr_tx;
178
179 const void *tx;
180 void *rx;
181 unsigned int tx_left;
182 unsigned int rx_left;
183
184 atomic_t state;
185
186 /*depth of the FIFO buffer */
187 u32 fifo_len;
188 /* frequency of spiclk */
189 u32 freq;
190
191 u8 n_bytes;
192 u8 rsd;
193
194 bool target_abort;
195 bool cs_inactive; /* spi target transmission stop when cs inactive */
196 bool cs_high_supported; /* native CS supports active-high polarity */
197
198 struct spi_transfer *xfer; /* Store xfer temporarily */
199};
200
201static inline void spi_enable_chip(struct rockchip_spi *rs, bool enable)
202{
203 writel_relaxed((enable ? 1U : 0U), rs->regs + ROCKCHIP_SPI_SSIENR);
204}
205
206static inline void wait_for_tx_idle(struct rockchip_spi *rs, bool target_mode)
207{
208 unsigned long timeout = jiffies + msecs_to_jiffies(5);
209
210 do {
211 if (target_mode) {
212 if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_TARGET_TX_BUSY) &&
213 !((readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY)))
214 return;
215 } else {
216 if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY))
217 return;
218 }
219 } while (!time_after(jiffies, timeout));
220
221 dev_warn(rs->dev, "spi controller is in busy state!\n");
222}
223
224static u32 get_fifo_len(struct rockchip_spi *rs)
225{
226 u32 ver;
227
228 ver = readl_relaxed(rs->regs + ROCKCHIP_SPI_VERSION);
229
230 switch (ver) {
231 case ROCKCHIP_SPI_VER2_TYPE1:
232 case ROCKCHIP_SPI_VER2_TYPE2:
233 return 64;
234 default:
235 return 32;
236 }
237}
238
239static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
240{
241 struct spi_controller *ctlr = spi->controller;
242 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
243 bool cs_asserted = spi->mode & SPI_CS_HIGH ? enable : !enable;
244 bool cs_actual;
245
246 /*
247 * SPI subsystem tries to avoid no-op calls that would break the PM
248 * refcount below. It can't however for the first time it is used.
249 * To detect this case we read it here and bail out early for no-ops.
250 */
251 if (spi_get_csgpiod(spi, 0))
252 cs_actual = !!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SER) & 1);
253 else
254 cs_actual = !!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SER) &
255 BIT(spi_get_chipselect(spi, 0)));
256 if (unlikely(cs_actual == cs_asserted))
257 return;
258
259 if (cs_asserted) {
260 /* Keep things powered as long as CS is asserted */
261 pm_runtime_get_sync(rs->dev);
262
263 if (spi_get_csgpiod(spi, 0))
264 ROCKCHIP_SPI_SET_BITS(rs->regs + ROCKCHIP_SPI_SER, 1);
265 else
266 ROCKCHIP_SPI_SET_BITS(rs->regs + ROCKCHIP_SPI_SER,
267 BIT(spi_get_chipselect(spi, 0)));
268 } else {
269 if (spi_get_csgpiod(spi, 0))
270 ROCKCHIP_SPI_CLR_BITS(rs->regs + ROCKCHIP_SPI_SER, 1);
271 else
272 ROCKCHIP_SPI_CLR_BITS(rs->regs + ROCKCHIP_SPI_SER,
273 BIT(spi_get_chipselect(spi, 0)));
274
275 /* Drop reference from when we first asserted CS */
276 pm_runtime_put(rs->dev);
277 }
278}
279
280static void rockchip_spi_handle_err(struct spi_controller *ctlr,
281 struct spi_message *msg)
282{
283 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
284
285 /* stop running spi transfer
286 * this also flushes both rx and tx fifos
287 */
288 spi_enable_chip(rs, false);
289
290 /* make sure all interrupts are masked and status cleared */
291 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_IMR);
292 writel_relaxed(0xffffffff, rs->regs + ROCKCHIP_SPI_ICR);
293
294 if (atomic_read(&rs->state) & TXDMA)
295 dmaengine_terminate_async(ctlr->dma_tx);
296
297 if (atomic_read(&rs->state) & RXDMA)
298 dmaengine_terminate_async(ctlr->dma_rx);
299}
300
301static void rockchip_spi_pio_writer(struct rockchip_spi *rs)
302{
303 u32 tx_free = rs->fifo_len - readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFLR);
304 u32 words = min(rs->tx_left, tx_free);
305
306 rs->tx_left -= words;
307 for (; words; words--) {
308 u32 txw;
309
310 if (rs->n_bytes == 1)
311 txw = *(u8 *)rs->tx;
312 else
313 txw = *(u16 *)rs->tx;
314
315 writel_relaxed(txw, rs->regs + ROCKCHIP_SPI_TXDR);
316 rs->tx += rs->n_bytes;
317 }
318}
319
320static void rockchip_spi_pio_reader(struct rockchip_spi *rs)
321{
322 u32 words = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
323 u32 rx_left = (rs->rx_left > words) ? rs->rx_left - words : 0;
324
325 /* the hardware doesn't allow us to change fifo threshold
326 * level while spi is enabled, so instead make sure to leave
327 * enough words in the rx fifo to get the last interrupt
328 * exactly when all words have been received
329 */
330 if (rx_left) {
331 u32 ftl = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFTLR) + 1;
332
333 if (rx_left < ftl) {
334 rx_left = ftl;
335 words = rs->rx_left - rx_left;
336 }
337 }
338
339 rs->rx_left = rx_left;
340 for (; words; words--) {
341 u32 rxw = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
342
343 if (!rs->rx)
344 continue;
345
346 if (rs->n_bytes == 1)
347 *(u8 *)rs->rx = (u8)rxw;
348 else
349 *(u16 *)rs->rx = (u16)rxw;
350 rs->rx += rs->n_bytes;
351 }
352}
353
354static irqreturn_t rockchip_spi_isr(int irq, void *dev_id)
355{
356 struct spi_controller *ctlr = dev_id;
357 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
358
359 /* When int_cs_inactive comes, spi target abort */
360 if (rs->cs_inactive && readl_relaxed(rs->regs + ROCKCHIP_SPI_IMR) & INT_CS_INACTIVE) {
361 ctlr->target_abort(ctlr);
362 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_IMR);
363 writel_relaxed(0xffffffff, rs->regs + ROCKCHIP_SPI_ICR);
364
365 return IRQ_HANDLED;
366 }
367
368 if (rs->tx_left)
369 rockchip_spi_pio_writer(rs);
370
371 rockchip_spi_pio_reader(rs);
372 if (!rs->rx_left) {
373 spi_enable_chip(rs, false);
374 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_IMR);
375 writel_relaxed(0xffffffff, rs->regs + ROCKCHIP_SPI_ICR);
376 spi_finalize_current_transfer(ctlr);
377 }
378
379 return IRQ_HANDLED;
380}
381
382static int rockchip_spi_prepare_irq(struct rockchip_spi *rs,
383 struct spi_controller *ctlr,
384 struct spi_transfer *xfer)
385{
386 rs->tx = xfer->tx_buf;
387 rs->rx = xfer->rx_buf;
388 rs->tx_left = rs->tx ? xfer->len / rs->n_bytes : 0;
389 rs->rx_left = xfer->len / rs->n_bytes;
390
391 writel_relaxed(0xffffffff, rs->regs + ROCKCHIP_SPI_ICR);
392
393 spi_enable_chip(rs, true);
394
395 if (rs->tx_left)
396 rockchip_spi_pio_writer(rs);
397
398 if (rs->cs_inactive)
399 writel_relaxed(INT_RF_FULL | INT_CS_INACTIVE, rs->regs + ROCKCHIP_SPI_IMR);
400 else
401 writel_relaxed(INT_RF_FULL, rs->regs + ROCKCHIP_SPI_IMR);
402
403 /* 1 means the transfer is in progress */
404 return 1;
405}
406
407static void rockchip_spi_dma_rxcb(void *data)
408{
409 struct spi_controller *ctlr = data;
410 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
411 int state = atomic_fetch_andnot(RXDMA, &rs->state);
412
413 if (state & TXDMA && !rs->target_abort)
414 return;
415
416 if (rs->cs_inactive)
417 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_IMR);
418
419 spi_enable_chip(rs, false);
420 spi_finalize_current_transfer(ctlr);
421}
422
423static void rockchip_spi_dma_txcb(void *data)
424{
425 struct spi_controller *ctlr = data;
426 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
427 int state = atomic_fetch_andnot(TXDMA, &rs->state);
428
429 if (state & RXDMA && !rs->target_abort)
430 return;
431
432 /* Wait until the FIFO data completely. */
433 wait_for_tx_idle(rs, ctlr->target);
434
435 spi_enable_chip(rs, false);
436 spi_finalize_current_transfer(ctlr);
437}
438
439static u32 rockchip_spi_calc_burst_size(u32 data_len)
440{
441 u32 i;
442
443 /* burst size: 1, 2, 4, 8 */
444 for (i = 1; i < 8; i <<= 1) {
445 if (data_len & i)
446 break;
447 }
448
449 return i;
450}
451
452static int rockchip_spi_prepare_dma(struct rockchip_spi *rs,
453 struct spi_controller *ctlr, struct spi_transfer *xfer)
454{
455 struct dma_async_tx_descriptor *rxdesc, *txdesc;
456
457 atomic_set(&rs->state, 0);
458
459 rs->tx = xfer->tx_buf;
460 rs->rx = xfer->rx_buf;
461
462 rxdesc = NULL;
463 if (xfer->rx_buf) {
464 struct dma_slave_config rxconf = {
465 .direction = DMA_DEV_TO_MEM,
466 .src_addr = rs->dma_addr_rx,
467 .src_addr_width = rs->n_bytes,
468 .src_maxburst = rockchip_spi_calc_burst_size(xfer->len / rs->n_bytes),
469 };
470
471 dmaengine_slave_config(ctlr->dma_rx, &rxconf);
472
473 rxdesc = dmaengine_prep_slave_sg(
474 ctlr->dma_rx,
475 xfer->rx_sg.sgl, xfer->rx_sg.nents,
476 DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
477 if (!rxdesc)
478 return -EINVAL;
479
480 rxdesc->callback = rockchip_spi_dma_rxcb;
481 rxdesc->callback_param = ctlr;
482 }
483
484 txdesc = NULL;
485 if (xfer->tx_buf) {
486 struct dma_slave_config txconf = {
487 .direction = DMA_MEM_TO_DEV,
488 .dst_addr = rs->dma_addr_tx,
489 .dst_addr_width = rs->n_bytes,
490 .dst_maxburst = rs->fifo_len / 4,
491 };
492
493 dmaengine_slave_config(ctlr->dma_tx, &txconf);
494
495 txdesc = dmaengine_prep_slave_sg(
496 ctlr->dma_tx,
497 xfer->tx_sg.sgl, xfer->tx_sg.nents,
498 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
499 if (!txdesc) {
500 if (rxdesc)
501 dmaengine_terminate_sync(ctlr->dma_rx);
502 return -EINVAL;
503 }
504
505 txdesc->callback = rockchip_spi_dma_txcb;
506 txdesc->callback_param = ctlr;
507 }
508
509 /* rx must be started before tx due to spi instinct */
510 if (rxdesc) {
511 atomic_or(RXDMA, &rs->state);
512 ctlr->dma_rx->cookie = dmaengine_submit(rxdesc);
513 dma_async_issue_pending(ctlr->dma_rx);
514 }
515
516 if (rs->cs_inactive)
517 writel_relaxed(INT_CS_INACTIVE, rs->regs + ROCKCHIP_SPI_IMR);
518
519 spi_enable_chip(rs, true);
520
521 if (txdesc) {
522 atomic_or(TXDMA, &rs->state);
523 dmaengine_submit(txdesc);
524 dma_async_issue_pending(ctlr->dma_tx);
525 }
526
527 /* 1 means the transfer is in progress */
528 return 1;
529}
530
531static int rockchip_spi_config(struct rockchip_spi *rs,
532 struct spi_device *spi, struct spi_transfer *xfer,
533 bool use_dma, bool target_mode)
534{
535 u32 cr0 = CR0_FRF_SPI << CR0_FRF_OFFSET
536 | CR0_BHT_8BIT << CR0_BHT_OFFSET
537 | CR0_SSD_ONE << CR0_SSD_OFFSET
538 | CR0_EM_BIG << CR0_EM_OFFSET;
539 u32 cr1;
540 u32 dmacr = 0;
541
542 if (target_mode)
543 cr0 |= CR0_OPM_TARGET << CR0_OPM_OFFSET;
544 rs->target_abort = false;
545
546 cr0 |= rs->rsd << CR0_RSD_OFFSET;
547 cr0 |= (spi->mode & 0x3U) << CR0_SCPH_OFFSET;
548 if (spi->mode & SPI_LSB_FIRST)
549 cr0 |= CR0_FBM_LSB << CR0_FBM_OFFSET;
550 if (spi->mode & SPI_CS_HIGH)
551 cr0 |= BIT(spi_get_chipselect(spi, 0)) << CR0_SOI_OFFSET;
552
553 if (xfer->rx_buf && xfer->tx_buf)
554 cr0 |= CR0_XFM_TR << CR0_XFM_OFFSET;
555 else if (xfer->rx_buf)
556 cr0 |= CR0_XFM_RO << CR0_XFM_OFFSET;
557 else if (use_dma)
558 cr0 |= CR0_XFM_TO << CR0_XFM_OFFSET;
559
560 switch (xfer->bits_per_word) {
561 case 4:
562 cr0 |= CR0_DFS_4BIT << CR0_DFS_OFFSET;
563 cr1 = xfer->len - 1;
564 break;
565 case 8:
566 cr0 |= CR0_DFS_8BIT << CR0_DFS_OFFSET;
567 cr1 = xfer->len - 1;
568 break;
569 case 16:
570 cr0 |= CR0_DFS_16BIT << CR0_DFS_OFFSET;
571 cr1 = xfer->len / 2 - 1;
572 break;
573 default:
574 /* we only whitelist 4, 8 and 16 bit words in
575 * ctlr->bits_per_word_mask, so this shouldn't
576 * happen
577 */
578 dev_err(rs->dev, "unknown bits per word: %d\n",
579 xfer->bits_per_word);
580 return -EINVAL;
581 }
582
583 if (use_dma) {
584 if (xfer->tx_buf)
585 dmacr |= TF_DMA_EN;
586 if (xfer->rx_buf)
587 dmacr |= RF_DMA_EN;
588 }
589
590 writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0);
591 writel_relaxed(cr1, rs->regs + ROCKCHIP_SPI_CTRLR1);
592
593 /* unfortunately setting the fifo threshold level to generate an
594 * interrupt exactly when the fifo is full doesn't seem to work,
595 * so we need the strict inequality here
596 */
597 if ((xfer->len / rs->n_bytes) < rs->fifo_len)
598 writel_relaxed(xfer->len / rs->n_bytes - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
599 else
600 writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
601
602 writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_DMATDLR);
603 writel_relaxed(rockchip_spi_calc_burst_size(xfer->len / rs->n_bytes) - 1,
604 rs->regs + ROCKCHIP_SPI_DMARDLR);
605 writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR);
606
607 /* the hardware only supports an even clock divisor, so
608 * round divisor = spiclk / speed up to nearest even number
609 * so that the resulting speed is <= the requested speed
610 */
611 writel_relaxed(2 * DIV_ROUND_UP(rs->freq, 2 * xfer->speed_hz),
612 rs->regs + ROCKCHIP_SPI_BAUDR);
613
614 return 0;
615}
616
617static size_t rockchip_spi_max_transfer_size(struct spi_device *spi)
618{
619 return ROCKCHIP_SPI_MAX_TRANLEN;
620}
621
622static int rockchip_spi_target_abort(struct spi_controller *ctlr)
623{
624 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
625 u32 rx_fifo_left;
626 struct dma_tx_state state;
627 enum dma_status status;
628
629 /* Get current dma rx point */
630 if (atomic_read(&rs->state) & RXDMA) {
631 dmaengine_pause(ctlr->dma_rx);
632 status = dmaengine_tx_status(ctlr->dma_rx, ctlr->dma_rx->cookie, &state);
633 if (status == DMA_ERROR) {
634 rs->rx = rs->xfer->rx_buf;
635 rs->xfer->len = 0;
636 rx_fifo_left = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
637 for (; rx_fifo_left; rx_fifo_left--)
638 readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
639 goto out;
640 } else {
641 rs->rx += rs->xfer->len - rs->n_bytes * state.residue;
642 }
643 }
644
645 /* Get the valid data left in rx fifo and set rs->xfer->len real rx size */
646 if (rs->rx) {
647 rx_fifo_left = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
648 for (; rx_fifo_left; rx_fifo_left--) {
649 u32 rxw = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
650
651 if (rs->n_bytes == 1)
652 *(u8 *)rs->rx = (u8)rxw;
653 else
654 *(u16 *)rs->rx = (u16)rxw;
655 rs->rx += rs->n_bytes;
656 }
657 rs->xfer->len = (unsigned int)(rs->rx - rs->xfer->rx_buf);
658 }
659
660out:
661 if (atomic_read(&rs->state) & RXDMA)
662 dmaengine_terminate_sync(ctlr->dma_rx);
663 if (atomic_read(&rs->state) & TXDMA)
664 dmaengine_terminate_sync(ctlr->dma_tx);
665 atomic_set(&rs->state, 0);
666 spi_enable_chip(rs, false);
667 rs->target_abort = true;
668 spi_finalize_current_transfer(ctlr);
669
670 return 0;
671}
672
673static int rockchip_spi_transfer_one(
674 struct spi_controller *ctlr,
675 struct spi_device *spi,
676 struct spi_transfer *xfer)
677{
678 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
679 int ret;
680 bool use_dma;
681
682 /* Zero length transfers won't trigger an interrupt on completion */
683 if (!xfer->len) {
684 spi_finalize_current_transfer(ctlr);
685 return 1;
686 }
687
688 WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) &&
689 (readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY));
690
691 if (!xfer->tx_buf && !xfer->rx_buf) {
692 dev_err(rs->dev, "No buffer for transfer\n");
693 return -EINVAL;
694 }
695
696 if (xfer->len > ROCKCHIP_SPI_MAX_TRANLEN) {
697 dev_err(rs->dev, "Transfer is too long (%d)\n", xfer->len);
698 return -EINVAL;
699 }
700
701 rs->n_bytes = xfer->bits_per_word <= 8 ? 1 : 2;
702 rs->xfer = xfer;
703 use_dma = ctlr->can_dma ? ctlr->can_dma(ctlr, spi, xfer) : false;
704
705 ret = rockchip_spi_config(rs, spi, xfer, use_dma, ctlr->target);
706 if (ret)
707 return ret;
708
709 if (use_dma)
710 return rockchip_spi_prepare_dma(rs, ctlr, xfer);
711
712 return rockchip_spi_prepare_irq(rs, ctlr, xfer);
713}
714
715static bool rockchip_spi_can_dma(struct spi_controller *ctlr,
716 struct spi_device *spi,
717 struct spi_transfer *xfer)
718{
719 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
720 unsigned int bytes_per_word = xfer->bits_per_word <= 8 ? 1 : 2;
721
722 /* if the numbor of spi words to transfer is less than the fifo
723 * length we can just fill the fifo and wait for a single irq,
724 * so don't bother setting up dma
725 */
726 return xfer->len / bytes_per_word >= rs->fifo_len;
727}
728
729static int rockchip_spi_setup(struct spi_device *spi)
730{
731 struct rockchip_spi *rs = spi_controller_get_devdata(spi->controller);
732 u32 cr0;
733
734 if (!spi_get_csgpiod(spi, 0) && (spi->mode & SPI_CS_HIGH) && !rs->cs_high_supported) {
735 dev_warn(&spi->dev, "setup: non GPIO CS can't be active-high\n");
736 return -EINVAL;
737 }
738
739 pm_runtime_get_sync(rs->dev);
740
741 cr0 = readl_relaxed(rs->regs + ROCKCHIP_SPI_CTRLR0);
742
743 cr0 &= ~(0x3 << CR0_SCPH_OFFSET);
744 cr0 |= ((spi->mode & 0x3) << CR0_SCPH_OFFSET);
745 if (spi->mode & SPI_CS_HIGH && spi_get_chipselect(spi, 0) <= 1)
746 cr0 |= BIT(spi_get_chipselect(spi, 0)) << CR0_SOI_OFFSET;
747 else if (spi_get_chipselect(spi, 0) <= 1)
748 cr0 &= ~(BIT(spi_get_chipselect(spi, 0)) << CR0_SOI_OFFSET);
749
750 writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0);
751
752 pm_runtime_put(rs->dev);
753
754 return 0;
755}
756
757static int rockchip_spi_probe(struct platform_device *pdev)
758{
759 struct device_node *np = pdev->dev.of_node;
760 struct spi_controller *ctlr;
761 struct rockchip_spi *rs;
762 struct resource *mem;
763 u32 rsd_nsecs, num_cs;
764 bool target_mode;
765 int ret;
766
767 target_mode = of_property_read_bool(np, "spi-slave");
768
769 if (target_mode)
770 ctlr = spi_alloc_target(&pdev->dev, sizeof(struct rockchip_spi));
771 else
772 ctlr = spi_alloc_host(&pdev->dev, sizeof(struct rockchip_spi));
773
774 if (!ctlr)
775 return -ENOMEM;
776
777 platform_set_drvdata(pdev, ctlr);
778
779 rs = spi_controller_get_devdata(ctlr);
780
781 /* Get basic io resource and map it */
782 rs->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);
783 if (IS_ERR(rs->regs)) {
784 ret = PTR_ERR(rs->regs);
785 goto err_put_ctlr;
786 }
787
788 rs->apb_pclk = devm_clk_get_enabled(&pdev->dev, "apb_pclk");
789 if (IS_ERR(rs->apb_pclk)) {
790 ret = dev_err_probe(&pdev->dev, PTR_ERR(rs->apb_pclk),
791 "Failed to get apb_pclk\n");
792 goto err_put_ctlr;
793 }
794
795 rs->spiclk = devm_clk_get_enabled(&pdev->dev, "spiclk");
796 if (IS_ERR(rs->spiclk)) {
797 ret = dev_err_probe(&pdev->dev, PTR_ERR(rs->spiclk),
798 "Failed to get spi_pclk\n");
799 goto err_put_ctlr;
800 }
801
802 spi_enable_chip(rs, false);
803
804 ret = platform_get_irq(pdev, 0);
805 if (ret < 0)
806 goto err_put_ctlr;
807
808 ret = devm_request_threaded_irq(&pdev->dev, ret, rockchip_spi_isr, NULL,
809 IRQF_ONESHOT, dev_name(&pdev->dev), ctlr);
810 if (ret)
811 goto err_put_ctlr;
812
813 rs->dev = &pdev->dev;
814 rs->freq = clk_get_rate(rs->spiclk);
815
816 if (!of_property_read_u32(pdev->dev.of_node, "rx-sample-delay-ns",
817 &rsd_nsecs)) {
818 /* rx sample delay is expressed in parent clock cycles (max 3) */
819 u32 rsd = DIV_ROUND_CLOSEST(rsd_nsecs * (rs->freq >> 8), 1000000000 >> 8);
820 if (!rsd) {
821 dev_warn(rs->dev, "%u Hz are too slow to express %u ns delay\n",
822 rs->freq, rsd_nsecs);
823 } else if (rsd > CR0_RSD_MAX) {
824 rsd = CR0_RSD_MAX;
825 dev_warn(rs->dev,
826 "%u Hz are too fast to express %u ns delay, clamping at %u ns\n",
827 rs->freq, rsd_nsecs, CR0_RSD_MAX * 1000000000U / rs->freq);
828 }
829 rs->rsd = rsd;
830 }
831
832 rs->fifo_len = get_fifo_len(rs);
833 if (!rs->fifo_len) {
834 ret = dev_err_probe(&pdev->dev, -EINVAL, "Failed to get fifo length\n");
835 goto err_put_ctlr;
836 }
837
838 pm_runtime_set_autosuspend_delay(&pdev->dev, ROCKCHIP_AUTOSUSPEND_TIMEOUT);
839 pm_runtime_use_autosuspend(&pdev->dev);
840 pm_runtime_set_active(&pdev->dev);
841 pm_runtime_enable(&pdev->dev);
842
843 ctlr->auto_runtime_pm = true;
844 ctlr->bus_num = pdev->id;
845 ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP | SPI_LSB_FIRST;
846 if (target_mode) {
847 ctlr->mode_bits |= SPI_NO_CS;
848 ctlr->target_abort = rockchip_spi_target_abort;
849 } else {
850 ctlr->flags = SPI_CONTROLLER_GPIO_SS;
851 ctlr->max_native_cs = ROCKCHIP_SPI_MAX_NATIVE_CS_NUM;
852 /*
853 * rk spi0 has two native cs, spi1..5 one cs only
854 * if num-cs is missing in the dts, default to 1
855 */
856 if (of_property_read_u32(np, "num-cs", &num_cs))
857 num_cs = 1;
858 ctlr->num_chipselect = num_cs;
859 ctlr->use_gpio_descriptors = true;
860 }
861 ctlr->dev.of_node = pdev->dev.of_node;
862 ctlr->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8) | SPI_BPW_MASK(4);
863 ctlr->min_speed_hz = rs->freq / BAUDR_SCKDV_MAX;
864 ctlr->max_speed_hz = min(rs->freq / BAUDR_SCKDV_MIN, MAX_SCLK_OUT);
865
866 ctlr->setup = rockchip_spi_setup;
867 ctlr->set_cs = rockchip_spi_set_cs;
868 ctlr->transfer_one = rockchip_spi_transfer_one;
869 ctlr->max_transfer_size = rockchip_spi_max_transfer_size;
870 ctlr->handle_err = rockchip_spi_handle_err;
871
872 ctlr->dma_tx = dma_request_chan(rs->dev, "tx");
873 if (IS_ERR(ctlr->dma_tx)) {
874 /* Check tx to see if we need to defer driver probing */
875 ret = dev_warn_probe(rs->dev, PTR_ERR(ctlr->dma_tx),
876 "Failed to request optional TX DMA channel\n");
877 if (ret == -EPROBE_DEFER)
878 goto err_disable_pm_runtime;
879 ctlr->dma_tx = NULL;
880 }
881
882 ctlr->dma_rx = dma_request_chan(rs->dev, "rx");
883 if (IS_ERR(ctlr->dma_rx)) {
884 /* Check rx to see if we need to defer driver probing */
885 ret = dev_warn_probe(rs->dev, PTR_ERR(ctlr->dma_rx),
886 "Failed to request optional RX DMA channel\n");
887 if (ret == -EPROBE_DEFER)
888 goto err_free_dma_tx;
889 ctlr->dma_rx = NULL;
890 }
891
892 if (ctlr->dma_tx && ctlr->dma_rx) {
893 rs->dma_addr_tx = mem->start + ROCKCHIP_SPI_TXDR;
894 rs->dma_addr_rx = mem->start + ROCKCHIP_SPI_RXDR;
895 ctlr->can_dma = rockchip_spi_can_dma;
896 }
897
898 switch (readl_relaxed(rs->regs + ROCKCHIP_SPI_VERSION)) {
899 case ROCKCHIP_SPI_VER2_TYPE2:
900 rs->cs_high_supported = true;
901 ctlr->mode_bits |= SPI_CS_HIGH;
902 if (ctlr->can_dma && target_mode)
903 rs->cs_inactive = true;
904 else
905 rs->cs_inactive = false;
906 break;
907 default:
908 rs->cs_inactive = false;
909 break;
910 }
911
912 ret = devm_spi_register_controller(&pdev->dev, ctlr);
913 if (ret < 0) {
914 dev_err(&pdev->dev, "Failed to register controller\n");
915 goto err_free_dma_rx;
916 }
917
918 return 0;
919
920err_free_dma_rx:
921 if (ctlr->dma_rx)
922 dma_release_channel(ctlr->dma_rx);
923err_free_dma_tx:
924 if (ctlr->dma_tx)
925 dma_release_channel(ctlr->dma_tx);
926err_disable_pm_runtime:
927 pm_runtime_disable(&pdev->dev);
928err_put_ctlr:
929 spi_controller_put(ctlr);
930
931 return ret;
932}
933
934static void rockchip_spi_remove(struct platform_device *pdev)
935{
936 struct spi_controller *ctlr = spi_controller_get(platform_get_drvdata(pdev));
937
938 pm_runtime_get_sync(&pdev->dev);
939
940 pm_runtime_put_noidle(&pdev->dev);
941 pm_runtime_disable(&pdev->dev);
942 pm_runtime_set_suspended(&pdev->dev);
943
944 if (ctlr->dma_tx)
945 dma_release_channel(ctlr->dma_tx);
946 if (ctlr->dma_rx)
947 dma_release_channel(ctlr->dma_rx);
948
949 spi_controller_put(ctlr);
950}
951
952#ifdef CONFIG_PM_SLEEP
953static int rockchip_spi_suspend(struct device *dev)
954{
955 int ret;
956 struct spi_controller *ctlr = dev_get_drvdata(dev);
957
958 ret = spi_controller_suspend(ctlr);
959 if (ret < 0)
960 return ret;
961
962 ret = pm_runtime_force_suspend(dev);
963 if (ret < 0) {
964 spi_controller_resume(ctlr);
965 return ret;
966 }
967
968 pinctrl_pm_select_sleep_state(dev);
969
970 return 0;
971}
972
973static int rockchip_spi_resume(struct device *dev)
974{
975 int ret;
976 struct spi_controller *ctlr = dev_get_drvdata(dev);
977
978 pinctrl_pm_select_default_state(dev);
979
980 ret = pm_runtime_force_resume(dev);
981 if (ret < 0)
982 return ret;
983
984 return spi_controller_resume(ctlr);
985}
986#endif /* CONFIG_PM_SLEEP */
987
988#ifdef CONFIG_PM
989static int rockchip_spi_runtime_suspend(struct device *dev)
990{
991 struct spi_controller *ctlr = dev_get_drvdata(dev);
992 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
993
994 clk_disable_unprepare(rs->spiclk);
995 clk_disable_unprepare(rs->apb_pclk);
996
997 return 0;
998}
999
1000static int rockchip_spi_runtime_resume(struct device *dev)
1001{
1002 int ret;
1003 struct spi_controller *ctlr = dev_get_drvdata(dev);
1004 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
1005
1006 ret = clk_prepare_enable(rs->apb_pclk);
1007 if (ret < 0)
1008 return ret;
1009
1010 ret = clk_prepare_enable(rs->spiclk);
1011 if (ret < 0)
1012 clk_disable_unprepare(rs->apb_pclk);
1013
1014 return 0;
1015}
1016#endif /* CONFIG_PM */
1017
1018static const struct dev_pm_ops rockchip_spi_pm = {
1019 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(rockchip_spi_suspend, rockchip_spi_resume)
1020 SET_RUNTIME_PM_OPS(rockchip_spi_runtime_suspend,
1021 rockchip_spi_runtime_resume, NULL)
1022};
1023
1024static const struct of_device_id rockchip_spi_dt_match[] = {
1025 { .compatible = "rockchip,px30-spi", },
1026 { .compatible = "rockchip,rk3036-spi", },
1027 { .compatible = "rockchip,rk3066-spi", },
1028 { .compatible = "rockchip,rk3188-spi", },
1029 { .compatible = "rockchip,rk3228-spi", },
1030 { .compatible = "rockchip,rk3288-spi", },
1031 { .compatible = "rockchip,rk3308-spi", },
1032 { .compatible = "rockchip,rk3328-spi", },
1033 { .compatible = "rockchip,rk3368-spi", },
1034 { .compatible = "rockchip,rk3399-spi", },
1035 { .compatible = "rockchip,rv1108-spi", },
1036 { .compatible = "rockchip,rv1126-spi", },
1037 { },
1038};
1039MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match);
1040
1041static struct platform_driver rockchip_spi_driver = {
1042 .driver = {
1043 .name = DRIVER_NAME,
1044 .pm = &rockchip_spi_pm,
1045 .of_match_table = of_match_ptr(rockchip_spi_dt_match),
1046 },
1047 .probe = rockchip_spi_probe,
1048 .remove = rockchip_spi_remove,
1049};
1050
1051module_platform_driver(rockchip_spi_driver);
1052
1053MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>");
1054MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver");
1055MODULE_LICENSE("GPL v2");