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net: s2io: simplify logical constraint
[deliverable/linux.git] / drivers / spi / spi-rockchip.c
CommitLineData
64e36824 1/*
2 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
5dcc44ed 3 * Author: Addy Ke <addy.ke@rock-chips.com>
64e36824 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
64e36824 16#include <linux/clk.h>
ec5c5d8a
SL		 17#include <linux/dmaengine.h>
18#include <linux/module.h>
19#include <linux/of.h>
64e36824 20#include <linux/platform_device.h>
64e36824 21#include <linux/spi/spi.h>
64e36824 22#include <linux/pm_runtime.h>
ec5c5d8a 23#include <linux/scatterlist.h>
64e36824 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
f9cfd522
AK		 142/* sclk_out: spi master internal logic in rk3x can support 50Mhz */
143#define MAX_SCLK_OUT 50000000
144
5185a81c
BN		 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
64e36824 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;
108b5c8b 182 u32 rsd_nsecs;
64e36824 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;
5dcc44ed 192 /* protect state */
64e36824 193 spinlock_t lock;
194
64e36824 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;
80abf888 200 struct dma_slave_caps dma_caps;
64e36824 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
2df08e78
AK		 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;
64bc0110 226 } while (!time_after(jiffies, timeout));
2df08e78
AK		 227
228 dev_warn(rs->dev, "spi controller is in busy state!\n");
229}
230
64e36824 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;
b920cc31
HH		 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);
64e36824 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);
b920cc31
HH		 295
296 pm_runtime_put_sync(rs->dev);
64e36824 297}
298
299static int rockchip_spi_prepare_message(struct spi_master *master,
5dcc44ed 300 struct spi_message *msg)
64e36824 301{
302 struct rockchip_spi *rs = spi_master_get_devdata(master);
303 struct spi_device *spi = msg->spi;
304
64e36824 305 rs->mode = spi->mode;
306
307 return 0;
308}
309
2291793c
AS		 310static void rockchip_spi_handle_err(struct spi_master *master,
311 struct spi_message *msg)
64e36824 312{
313 unsigned long flags;
314 struct rockchip_spi *rs = spi_master_get_devdata(master);
315
316 spin_lock_irqsave(&rs->lock, flags);
317
5dcc44ed
AK		 318 /*
319 * For DMA mode, we need terminate DMA channel and flush
320 * fifo for the next transfer if DMA thansfer timeout.
2291793c
AS		 321 * handle_err() was called by core if transfer failed.
322 * Maybe it is reasonable for error handling here.
5dcc44ed 323 */
64e36824 324 if (rs->use_dma) {
325 if (rs->state & RXBUSY) {
557b7ea3 326 dmaengine_terminate_async(rs->dma_rx.ch);
64e36824 327 flush_fifo(rs);
328 }
329
330 if (rs->state & TXBUSY)
557b7ea3 331 dmaengine_terminate_async(rs->dma_tx.ch);
64e36824 332 }
333
334 spin_unlock_irqrestore(&rs->lock, flags);
2291793c
AS		 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);
64e36824 341
c28be31b
AK		 342 spi_enable_chip(rs, 0);
343
64e36824 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;
5dcc44ed 375 }
64e36824 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
2df08e78
AK		 396 /* If tx, wait until the FIFO data completely. */
397 if (rs->tx)
398 wait_for_idle(rs);
399
c28be31b
AK		 400 spi_enable_chip(rs, 0);
401
64e36824 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;
c28be31b
AK		 413 if (!(rs->state & TXBUSY)) {
414 spi_enable_chip(rs, 0);
64e36824 415 spi_finalize_current_transfer(rs->master);
c28be31b 416 }
64e36824 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
2df08e78
AK		 426 /* Wait until the FIFO data completely. */
427 wait_for_idle(rs);
428
64e36824 429 spin_lock_irqsave(&rs->lock, flags);
430
431 rs->state &= ~TXBUSY;
2c2bc748
AK		 432 if (!(rs->state & RXBUSY)) {
433 spi_enable_chip(rs, 0);
64e36824 434 spi_finalize_current_transfer(rs->master);
2c2bc748 435 }
64e36824 436
437 spin_unlock_irqrestore(&rs->lock, flags);
438}
439
ea984911 440static int rockchip_spi_prepare_dma(struct rockchip_spi *rs)
64e36824 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
97cf5669 451 rxdesc = NULL;
64e36824 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;
80abf888
AK		 456 if (rs->dma_caps.max_burst > 4)
457 rxconf.src_maxburst = 4;
458 else
459 rxconf.src_maxburst = 1;
64e36824 460 dmaengine_slave_config(rs->dma_rx.ch, &rxconf);
461
5dcc44ed
AK		 462 rxdesc = dmaengine_prep_slave_sg(
463 rs->dma_rx.ch,
64e36824 464 rs->rx_sg.sgl, rs->rx_sg.nents,
465 rs->dma_rx.direction, DMA_PREP_INTERRUPT);
ea984911
SL		 466 if (!rxdesc)
467 return -EINVAL;
64e36824 468
469 rxdesc->callback = rockchip_spi_dma_rxcb;
470 rxdesc->callback_param = rs;
471 }
472
97cf5669 473 txdesc = NULL;
64e36824 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;
80abf888
AK		 478 if (rs->dma_caps.max_burst > 4)
479 txconf.dst_maxburst = 4;
480 else
481 txconf.dst_maxburst = 1;
64e36824 482 dmaengine_slave_config(rs->dma_tx.ch, &txconf);
483
5dcc44ed
AK		 484 txdesc = dmaengine_prep_slave_sg(
485 rs->dma_tx.ch,
64e36824 486 rs->tx_sg.sgl, rs->tx_sg.nents,
487 rs->dma_tx.direction, DMA_PREP_INTERRUPT);
ea984911
SL		 488 if (!txdesc) {
489 if (rxdesc)
490 dmaengine_terminate_sync(rs->dma_rx.ch);
491 return -EINVAL;
492 }
64e36824 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 */
97cf5669 499 if (rxdesc) {
64e36824 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
97cf5669 507 if (txdesc) {
64e36824 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 }
ea984911
SL		 514
515 return 0;
64e36824 516}
517
518static void rockchip_spi_config(struct rockchip_spi *rs)
519{
520 u32 div = 0;
521 u32 dmacr = 0;
76b17e6e 522 int rsd = 0;
64e36824 523
524 u32 cr0 = (CR0_BHT_8BIT << CR0_BHT_OFFSET)
0277e01a
AK		 525 | (CR0_SSD_ONE << CR0_SSD_OFFSET)
526 | (CR0_EM_BIG << CR0_EM_OFFSET);
64e36824 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
f9cfd522
AK		 540 if (WARN_ON(rs->speed > MAX_SCLK_OUT))
541 rs->speed = MAX_SCLK_OUT;
542
bb51537a 543 /* the minimum divisor is 2 */
f9cfd522
AK		 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
64e36824 549 /* div doesn't support odd number */
754ec43c 550 div = DIV_ROUND_UP(rs->max_freq, rs->speed);
64e36824 551 div = (div + 1) & 0xfffe;
552
76b17e6e
JW		 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
64e36824 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
5dcc44ed 579 dev_dbg(rs->dev, "cr0 0x%x, div %d\n", cr0, div);
64e36824 580}
581
5185a81c
BN		 582static size_t rockchip_spi_max_transfer_size(struct spi_device *spi)
583{
584 return ROCKCHIP_SPI_MAX_TRANLEN;
585}
586
5dcc44ed
AK		 587static int rockchip_spi_transfer_one(
588 struct spi_master *master,
64e36824 589 struct spi_device *spi,
590 struct spi_transfer *xfer)
591{
4dc0dd83 592 int ret = 0;
64e36824 593 struct rockchip_spi *rs = spi_master_get_devdata(master);
594
62946172
DA		 595 WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) &&
596 (readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY));
64e36824 597
598 if (!xfer->tx_buf && !xfer->rx_buf) {
599 dev_err(rs->dev, "No buffer for transfer\n");
600 return -EINVAL;
601 }
602
5185a81c
BN		 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
64e36824 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
64e36824 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
a24e70c0 628 /* we need prepare dma before spi was enabled */
c28be31b 629 if (master->can_dma && master->can_dma(master, spi, xfer))
64e36824 630 rs->use_dma = 1;
c28be31b 631 else
64e36824 632 rs->use_dma = 0;
633
634 rockchip_spi_config(rs);
635
c28be31b
AK		 636 if (rs->use_dma) {
637 if (rs->tmode == CR0_XFM_RO) {
638 /* rx: dma must be prepared first */
ea984911 639 ret = rockchip_spi_prepare_dma(rs);
c28be31b
AK		 640 spi_enable_chip(rs, 1);
641 } else {
642 /* tx or tr: spi must be enabled first */
643 spi_enable_chip(rs, 1);
ea984911 644 ret = rockchip_spi_prepare_dma(rs);
c28be31b 645 }
4dc0dd83
TV		 646 /* successful DMA prepare means the transfer is in progress */
647 ret = ret ? ret : 1;
c28be31b
AK		 648 } else {
649 spi_enable_chip(rs, 1);
64e36824 650 ret = rockchip_spi_pio_transfer(rs);
c28be31b 651 }
64e36824 652
653 return ret;
654}
655
656static bool rockchip_spi_can_dma(struct spi_master *master,
5dcc44ed
AK		 657 struct spi_device *spi,
658 struct spi_transfer *xfer)
64e36824 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;
76b17e6e 671 u32 rsd_nsecs;
64e36824 672
673 master = spi_alloc_master(&pdev->dev, sizeof(struct rockchip_spi));
5dcc44ed 674 if (!master)
64e36824 675 return -ENOMEM;
5dcc44ed 676
64e36824 677 platform_set_drvdata(pdev, master);
678
679 rs = spi_master_get_devdata(master);
64e36824 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)) {
64e36824 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
76b17e6e
JW		 722 if (!of_property_read_u32(pdev->dev.of_node, "rx-sample-delay-ns",
723 &rsd_nsecs))
724 rs->rsd_nsecs = rsd_nsecs;
725
64e36824 726 rs->fifo_len = get_fifo_len(rs);
727 if (!rs->fifo_len) {
728 dev_err(&pdev->dev, "Failed to get fifo length\n");
db7e8d90 729 ret = -EINVAL;
64e36824 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;
ee780997 740 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP;
64e36824 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;
5185a81c 749 master->max_transfer_size = rockchip_spi_max_transfer_size;
2291793c 750 master->handle_err = rockchip_spi_handle_err;
64e36824 751
e4c0e06f
SL		 752 rs->dma_tx.ch = dma_request_chan(rs->dev, "tx");
753 if (IS_ERR(rs->dma_tx.ch)) {
61cadcf4
SL		 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 }
64e36824 759 dev_warn(rs->dev, "Failed to request TX DMA channel\n");
e4c0e06f 760 rs->dma_tx.ch = NULL;
61cadcf4 761 }
64e36824 762
e4c0e06f
SL		 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) {
e4c0e06f 766 ret = -EPROBE_DEFER;
5de7ed0c 767 goto err_free_dma_tx;
64e36824 768 }
769 dev_warn(rs->dev, "Failed to request RX DMA channel\n");
e4c0e06f 770 rs->dma_rx.ch = NULL;
64e36824 771 }
772
773 if (rs->dma_tx.ch && rs->dma_rx.ch) {
80abf888 774 dma_get_slave_caps(rs->dma_rx.ch, &(rs->dma_caps));
64e36824 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;
0ac7a490 778 rs->dma_rx.direction = DMA_DEV_TO_MEM;
64e36824 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
64e36824 791 return 0;
792
793err_register_master:
b8659add 794 pm_runtime_disable(&pdev->dev);
64e36824 795 if (rs->dma_rx.ch)
796 dma_release_channel(rs->dma_rx.ch);
5de7ed0c
DC		 797err_free_dma_tx:
798 if (rs->dma_tx.ch)
799 dma_release_channel(rs->dma_tx.ch);
64e36824 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
844c9f47
SL		 825 spi_master_put(master);
826
64e36824 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
ec833050 877#ifdef CONFIG_PM
64e36824 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}
ec833050 905#endif /* CONFIG_PM */
64e36824 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[] = {
aa29ea3d 914 { .compatible = "rockchip,rk3036-spi", },
64e36824 915 { .compatible = "rockchip,rk3066-spi", },
b839b785 916 { .compatible = "rockchip,rk3188-spi", },
aa29ea3d 917 { .compatible = "rockchip,rk3228-spi", },
b839b785 918 { .compatible = "rockchip,rk3288-spi", },
aa29ea3d 919 { .compatible = "rockchip,rk3368-spi", },
9b7a5622 920 { .compatible = "rockchip,rk3399-spi", },
64e36824 921 { },
922};
923MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match);
924
925static struct platform_driver rockchip_spi_driver = {
926 .driver = {
927 .name = DRIVER_NAME,
64e36824 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
5dcc44ed 937MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>");
64e36824 938MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver");
939MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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