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1// SPDX-License-Identifier: GPL-2.0+
2//
3// Copyright 2013 Freescale Semiconductor, Inc.
4// Copyright 2020 NXP
5//
6// Freescale DSPI driver
7// This file contains a driver for the Freescale DSPI
8
9#include <linux/clk.h>
10#include <linux/delay.h>
11#include <linux/dmaengine.h>
12#include <linux/dma-mapping.h>
13#include <linux/interrupt.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/platform_device.h>
18#include <linux/pinctrl/consumer.h>
19#include <linux/regmap.h>
20#include <linux/spi/spi.h>
21#include <linux/spi/spi-fsl-dspi.h>
22
23#define DRIVER_NAME "fsl-dspi"
24
25#define SPI_MCR 0x00
26#define SPI_MCR_HOST BIT(31)
27#define SPI_MCR_PCSIS(x) ((x) << 16)
28#define SPI_MCR_CLR_TXF BIT(11)
29#define SPI_MCR_CLR_RXF BIT(10)
30#define SPI_MCR_XSPI BIT(3)
31#define SPI_MCR_DIS_TXF BIT(13)
32#define SPI_MCR_DIS_RXF BIT(12)
33#define SPI_MCR_HALT BIT(0)
34
35#define SPI_TCR 0x08
36#define SPI_TCR_GET_TCNT(x) (((x) & GENMASK(31, 16)) >> 16)
37
38#define SPI_CTAR(x) (0x0c + (((x) & GENMASK(1, 0)) * 4))
39#define SPI_CTAR_FMSZ(x) (((x) << 27) & GENMASK(30, 27))
40#define SPI_CTAR_CPOL BIT(26)
41#define SPI_CTAR_CPHA BIT(25)
42#define SPI_CTAR_LSBFE BIT(24)
43#define SPI_CTAR_PCSSCK(x) (((x) << 22) & GENMASK(23, 22))
44#define SPI_CTAR_PASC(x) (((x) << 20) & GENMASK(21, 20))
45#define SPI_CTAR_PDT(x) (((x) << 18) & GENMASK(19, 18))
46#define SPI_CTAR_PBR(x) (((x) << 16) & GENMASK(17, 16))
47#define SPI_CTAR_CSSCK(x) (((x) << 12) & GENMASK(15, 12))
48#define SPI_CTAR_ASC(x) (((x) << 8) & GENMASK(11, 8))
49#define SPI_CTAR_DT(x) (((x) << 4) & GENMASK(7, 4))
50#define SPI_CTAR_BR(x) ((x) & GENMASK(3, 0))
51#define SPI_CTAR_SCALE_BITS 0xf
52
53#define SPI_CTAR0_SLAVE 0x0c
54
55#define SPI_SR 0x2c
56#define SPI_SR_TCFQF BIT(31)
57#define SPI_SR_TFUF BIT(27)
58#define SPI_SR_TFFF BIT(25)
59#define SPI_SR_CMDTCF BIT(23)
60#define SPI_SR_SPEF BIT(21)
61#define SPI_SR_RFOF BIT(19)
62#define SPI_SR_TFIWF BIT(18)
63#define SPI_SR_RFDF BIT(17)
64#define SPI_SR_CMDFFF BIT(16)
65#define SPI_SR_CLEAR (SPI_SR_TCFQF | \
66 SPI_SR_TFUF | SPI_SR_TFFF | \
67 SPI_SR_CMDTCF | SPI_SR_SPEF | \
68 SPI_SR_RFOF | SPI_SR_TFIWF | \
69 SPI_SR_RFDF | SPI_SR_CMDFFF)
70
71#define SPI_RSER_TFFFE BIT(25)
72#define SPI_RSER_TFFFD BIT(24)
73#define SPI_RSER_RFDFE BIT(17)
74#define SPI_RSER_RFDFD BIT(16)
75
76#define SPI_RSER 0x30
77#define SPI_RSER_TCFQE BIT(31)
78#define SPI_RSER_CMDTCFE BIT(23)
79
80#define SPI_PUSHR 0x34
81#define SPI_PUSHR_CMD_CONT BIT(15)
82#define SPI_PUSHR_CMD_CTAS(x) (((x) << 12 & GENMASK(14, 12)))
83#define SPI_PUSHR_CMD_EOQ BIT(11)
84#define SPI_PUSHR_CMD_CTCNT BIT(10)
85#define SPI_PUSHR_CMD_PCS(x) (BIT(x) & GENMASK(5, 0))
86
87#define SPI_PUSHR_SLAVE 0x34
88
89#define SPI_POPR 0x38
90
91#define SPI_TXFR0 0x3c
92#define SPI_TXFR1 0x40
93#define SPI_TXFR2 0x44
94#define SPI_TXFR3 0x48
95#define SPI_RXFR0 0x7c
96#define SPI_RXFR1 0x80
97#define SPI_RXFR2 0x84
98#define SPI_RXFR3 0x88
99
100#define SPI_CTARE(x) (0x11c + (((x) & GENMASK(1, 0)) * 4))
101#define SPI_CTARE_FMSZE(x) (((x) & 0x1) << 16)
102#define SPI_CTARE_DTCP(x) ((x) & 0x7ff)
103
104#define SPI_SREX 0x13c
105
106#define SPI_FRAME_BITS(bits) SPI_CTAR_FMSZ((bits) - 1)
107#define SPI_FRAME_EBITS(bits) SPI_CTARE_FMSZE(((bits) - 1) >> 4)
108
109#define DMA_COMPLETION_TIMEOUT msecs_to_jiffies(3000)
110
111struct chip_data {
112 u32 ctar_val;
113};
114
115enum dspi_trans_mode {
116 DSPI_XSPI_MODE,
117 DSPI_DMA_MODE,
118};
119
120struct fsl_dspi_devtype_data {
121 enum dspi_trans_mode trans_mode;
122 u8 max_clock_factor;
123 int fifo_size;
124};
125
126enum {
127 LS1021A,
128 LS1012A,
129 LS1028A,
130 LS1043A,
131 LS1046A,
132 LS2080A,
133 LS2085A,
134 LX2160A,
135 MCF5441X,
136 VF610,
137};
138
139static const struct fsl_dspi_devtype_data devtype_data[] = {
140 [VF610] = {
141 .trans_mode = DSPI_DMA_MODE,
142 .max_clock_factor = 2,
143 .fifo_size = 4,
144 },
145 [LS1021A] = {
146 /* Has A-011218 DMA erratum */
147 .trans_mode = DSPI_XSPI_MODE,
148 .max_clock_factor = 8,
149 .fifo_size = 4,
150 },
151 [LS1012A] = {
152 /* Has A-011218 DMA erratum */
153 .trans_mode = DSPI_XSPI_MODE,
154 .max_clock_factor = 8,
155 .fifo_size = 16,
156 },
157 [LS1028A] = {
158 .trans_mode = DSPI_XSPI_MODE,
159 .max_clock_factor = 8,
160 .fifo_size = 4,
161 },
162 [LS1043A] = {
163 /* Has A-011218 DMA erratum */
164 .trans_mode = DSPI_XSPI_MODE,
165 .max_clock_factor = 8,
166 .fifo_size = 16,
167 },
168 [LS1046A] = {
169 /* Has A-011218 DMA erratum */
170 .trans_mode = DSPI_XSPI_MODE,
171 .max_clock_factor = 8,
172 .fifo_size = 16,
173 },
174 [LS2080A] = {
175 .trans_mode = DSPI_XSPI_MODE,
176 .max_clock_factor = 8,
177 .fifo_size = 4,
178 },
179 [LS2085A] = {
180 .trans_mode = DSPI_XSPI_MODE,
181 .max_clock_factor = 8,
182 .fifo_size = 4,
183 },
184 [LX2160A] = {
185 .trans_mode = DSPI_XSPI_MODE,
186 .max_clock_factor = 8,
187 .fifo_size = 4,
188 },
189 [MCF5441X] = {
190 .trans_mode = DSPI_DMA_MODE,
191 .max_clock_factor = 8,
192 .fifo_size = 16,
193 },
194};
195
196struct fsl_dspi_dma {
197 u32 *tx_dma_buf;
198 struct dma_chan *chan_tx;
199 dma_addr_t tx_dma_phys;
200 struct completion cmd_tx_complete;
201 struct dma_async_tx_descriptor *tx_desc;
202
203 u32 *rx_dma_buf;
204 struct dma_chan *chan_rx;
205 dma_addr_t rx_dma_phys;
206 struct completion cmd_rx_complete;
207 struct dma_async_tx_descriptor *rx_desc;
208};
209
210struct fsl_dspi {
211 struct spi_controller *ctlr;
212 struct platform_device *pdev;
213
214 struct regmap *regmap;
215 struct regmap *regmap_pushr;
216 int irq;
217 struct clk *clk;
218
219 struct spi_transfer *cur_transfer;
220 struct spi_message *cur_msg;
221 struct chip_data *cur_chip;
222 size_t progress;
223 size_t len;
224 const void *tx;
225 void *rx;
226 u16 tx_cmd;
227 const struct fsl_dspi_devtype_data *devtype_data;
228
229 struct completion xfer_done;
230
231 struct fsl_dspi_dma *dma;
232
233 int oper_word_size;
234 int oper_bits_per_word;
235
236 int words_in_flight;
237
238 /*
239 * Offsets for CMD and TXDATA within SPI_PUSHR when accessed
240 * individually (in XSPI mode)
241 */
242 int pushr_cmd;
243 int pushr_tx;
244
245 void (*host_to_dev)(struct fsl_dspi *dspi, u32 *txdata);
246 void (*dev_to_host)(struct fsl_dspi *dspi, u32 rxdata);
247};
248
249static void dspi_native_host_to_dev(struct fsl_dspi *dspi, u32 *txdata)
250{
251 switch (dspi->oper_word_size) {
252 case 1:
253 *txdata = *(u8 *)dspi->tx;
254 break;
255 case 2:
256 *txdata = *(u16 *)dspi->tx;
257 break;
258 case 4:
259 *txdata = *(u32 *)dspi->tx;
260 break;
261 }
262 dspi->tx += dspi->oper_word_size;
263}
264
265static void dspi_native_dev_to_host(struct fsl_dspi *dspi, u32 rxdata)
266{
267 switch (dspi->oper_word_size) {
268 case 1:
269 *(u8 *)dspi->rx = rxdata;
270 break;
271 case 2:
272 *(u16 *)dspi->rx = rxdata;
273 break;
274 case 4:
275 *(u32 *)dspi->rx = rxdata;
276 break;
277 }
278 dspi->rx += dspi->oper_word_size;
279}
280
281static void dspi_8on32_host_to_dev(struct fsl_dspi *dspi, u32 *txdata)
282{
283 *txdata = cpu_to_be32(*(u32 *)dspi->tx);
284 dspi->tx += sizeof(u32);
285}
286
287static void dspi_8on32_dev_to_host(struct fsl_dspi *dspi, u32 rxdata)
288{
289 *(u32 *)dspi->rx = be32_to_cpu(rxdata);
290 dspi->rx += sizeof(u32);
291}
292
293static void dspi_8on16_host_to_dev(struct fsl_dspi *dspi, u32 *txdata)
294{
295 *txdata = cpu_to_be16(*(u16 *)dspi->tx);
296 dspi->tx += sizeof(u16);
297}
298
299static void dspi_8on16_dev_to_host(struct fsl_dspi *dspi, u32 rxdata)
300{
301 *(u16 *)dspi->rx = be16_to_cpu(rxdata);
302 dspi->rx += sizeof(u16);
303}
304
305static void dspi_16on32_host_to_dev(struct fsl_dspi *dspi, u32 *txdata)
306{
307 u16 hi = *(u16 *)dspi->tx;
308 u16 lo = *(u16 *)(dspi->tx + 2);
309
310 *txdata = (u32)hi << 16 | lo;
311 dspi->tx += sizeof(u32);
312}
313
314static void dspi_16on32_dev_to_host(struct fsl_dspi *dspi, u32 rxdata)
315{
316 u16 hi = rxdata & 0xffff;
317 u16 lo = rxdata >> 16;
318
319 *(u16 *)dspi->rx = lo;
320 *(u16 *)(dspi->rx + 2) = hi;
321 dspi->rx += sizeof(u32);
322}
323
324/*
325 * Pop one word from the TX buffer for pushing into the
326 * PUSHR register (TX FIFO)
327 */
328static u32 dspi_pop_tx(struct fsl_dspi *dspi)
329{
330 u32 txdata = 0;
331
332 if (dspi->tx)
333 dspi->host_to_dev(dspi, &txdata);
334 dspi->len -= dspi->oper_word_size;
335 return txdata;
336}
337
338/* Prepare one TX FIFO entry (txdata plus cmd) */
339static u32 dspi_pop_tx_pushr(struct fsl_dspi *dspi)
340{
341 u16 cmd = dspi->tx_cmd, data = dspi_pop_tx(dspi);
342
343 if (spi_controller_is_target(dspi->ctlr))
344 return data;
345
346 if (dspi->len > 0)
347 cmd |= SPI_PUSHR_CMD_CONT;
348 return cmd << 16 | data;
349}
350
351/* Push one word to the RX buffer from the POPR register (RX FIFO) */
352static void dspi_push_rx(struct fsl_dspi *dspi, u32 rxdata)
353{
354 if (!dspi->rx)
355 return;
356 dspi->dev_to_host(dspi, rxdata);
357}
358
359static void dspi_tx_dma_callback(void *arg)
360{
361 struct fsl_dspi *dspi = arg;
362 struct fsl_dspi_dma *dma = dspi->dma;
363
364 complete(&dma->cmd_tx_complete);
365}
366
367static void dspi_rx_dma_callback(void *arg)
368{
369 struct fsl_dspi *dspi = arg;
370 struct fsl_dspi_dma *dma = dspi->dma;
371 int i;
372
373 if (dspi->rx) {
374 for (i = 0; i < dspi->words_in_flight; i++)
375 dspi_push_rx(dspi, dspi->dma->rx_dma_buf[i]);
376 }
377
378 complete(&dma->cmd_rx_complete);
379}
380
381static int dspi_next_xfer_dma_submit(struct fsl_dspi *dspi)
382{
383 struct device *dev = &dspi->pdev->dev;
384 struct fsl_dspi_dma *dma = dspi->dma;
385 int time_left;
386 int i;
387
388 for (i = 0; i < dspi->words_in_flight; i++)
389 dspi->dma->tx_dma_buf[i] = dspi_pop_tx_pushr(dspi);
390
391 dma->tx_desc = dmaengine_prep_slave_single(dma->chan_tx,
392 dma->tx_dma_phys,
393 dspi->words_in_flight *
394 DMA_SLAVE_BUSWIDTH_4_BYTES,
395 DMA_MEM_TO_DEV,
396 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
397 if (!dma->tx_desc) {
398 dev_err(dev, "Not able to get desc for DMA xfer\n");
399 return -EIO;
400 }
401
402 dma->tx_desc->callback = dspi_tx_dma_callback;
403 dma->tx_desc->callback_param = dspi;
404 if (dma_submit_error(dmaengine_submit(dma->tx_desc))) {
405 dev_err(dev, "DMA submit failed\n");
406 return -EINVAL;
407 }
408
409 dma->rx_desc = dmaengine_prep_slave_single(dma->chan_rx,
410 dma->rx_dma_phys,
411 dspi->words_in_flight *
412 DMA_SLAVE_BUSWIDTH_4_BYTES,
413 DMA_DEV_TO_MEM,
414 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
415 if (!dma->rx_desc) {
416 dev_err(dev, "Not able to get desc for DMA xfer\n");
417 return -EIO;
418 }
419
420 dma->rx_desc->callback = dspi_rx_dma_callback;
421 dma->rx_desc->callback_param = dspi;
422 if (dma_submit_error(dmaengine_submit(dma->rx_desc))) {
423 dev_err(dev, "DMA submit failed\n");
424 return -EINVAL;
425 }
426
427 reinit_completion(&dspi->dma->cmd_rx_complete);
428 reinit_completion(&dspi->dma->cmd_tx_complete);
429
430 dma_async_issue_pending(dma->chan_rx);
431 dma_async_issue_pending(dma->chan_tx);
432
433 if (spi_controller_is_target(dspi->ctlr)) {
434 wait_for_completion_interruptible(&dspi->dma->cmd_rx_complete);
435 return 0;
436 }
437
438 time_left = wait_for_completion_timeout(&dspi->dma->cmd_tx_complete,
439 DMA_COMPLETION_TIMEOUT);
440 if (time_left == 0) {
441 dev_err(dev, "DMA tx timeout\n");
442 dmaengine_terminate_all(dma->chan_tx);
443 dmaengine_terminate_all(dma->chan_rx);
444 return -ETIMEDOUT;
445 }
446
447 time_left = wait_for_completion_timeout(&dspi->dma->cmd_rx_complete,
448 DMA_COMPLETION_TIMEOUT);
449 if (time_left == 0) {
450 dev_err(dev, "DMA rx timeout\n");
451 dmaengine_terminate_all(dma->chan_tx);
452 dmaengine_terminate_all(dma->chan_rx);
453 return -ETIMEDOUT;
454 }
455
456 return 0;
457}
458
459static void dspi_setup_accel(struct fsl_dspi *dspi);
460
461static int dspi_dma_xfer(struct fsl_dspi *dspi)
462{
463 struct spi_message *message = dspi->cur_msg;
464 struct device *dev = &dspi->pdev->dev;
465 int ret = 0;
466
467 /*
468 * dspi->len gets decremented by dspi_pop_tx_pushr in
469 * dspi_next_xfer_dma_submit
470 */
471 while (dspi->len) {
472 /* Figure out operational bits-per-word for this chunk */
473 dspi_setup_accel(dspi);
474
475 dspi->words_in_flight = dspi->len / dspi->oper_word_size;
476 if (dspi->words_in_flight > dspi->devtype_data->fifo_size)
477 dspi->words_in_flight = dspi->devtype_data->fifo_size;
478
479 message->actual_length += dspi->words_in_flight *
480 dspi->oper_word_size;
481
482 ret = dspi_next_xfer_dma_submit(dspi);
483 if (ret) {
484 dev_err(dev, "DMA transfer failed\n");
485 break;
486 }
487 }
488
489 return ret;
490}
491
492static int dspi_request_dma(struct fsl_dspi *dspi, phys_addr_t phy_addr)
493{
494 int dma_bufsize = dspi->devtype_data->fifo_size * 2;
495 struct device *dev = &dspi->pdev->dev;
496 struct dma_slave_config cfg;
497 struct fsl_dspi_dma *dma;
498 int ret;
499
500 dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
501 if (!dma)
502 return -ENOMEM;
503
504 dma->chan_rx = dma_request_chan(dev, "rx");
505 if (IS_ERR(dma->chan_rx)) {
506 return dev_err_probe(dev, PTR_ERR(dma->chan_rx),
507 "rx dma channel not available\n");
508 }
509
510 dma->chan_tx = dma_request_chan(dev, "tx");
511 if (IS_ERR(dma->chan_tx)) {
512 ret = PTR_ERR(dma->chan_tx);
513 dev_err_probe(dev, ret, "tx dma channel not available\n");
514 goto err_tx_channel;
515 }
516
517 dma->tx_dma_buf = dma_alloc_coherent(dma->chan_tx->device->dev,
518 dma_bufsize, &dma->tx_dma_phys,
519 GFP_KERNEL);
520 if (!dma->tx_dma_buf) {
521 ret = -ENOMEM;
522 goto err_tx_dma_buf;
523 }
524
525 dma->rx_dma_buf = dma_alloc_coherent(dma->chan_rx->device->dev,
526 dma_bufsize, &dma->rx_dma_phys,
527 GFP_KERNEL);
528 if (!dma->rx_dma_buf) {
529 ret = -ENOMEM;
530 goto err_rx_dma_buf;
531 }
532
533 memset(&cfg, 0, sizeof(cfg));
534 cfg.src_addr = phy_addr + SPI_POPR;
535 cfg.dst_addr = phy_addr + SPI_PUSHR;
536 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
537 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
538 cfg.src_maxburst = 1;
539 cfg.dst_maxburst = 1;
540
541 cfg.direction = DMA_DEV_TO_MEM;
542 ret = dmaengine_slave_config(dma->chan_rx, &cfg);
543 if (ret) {
544 dev_err(dev, "can't configure rx dma channel\n");
545 ret = -EINVAL;
546 goto err_slave_config;
547 }
548
549 cfg.direction = DMA_MEM_TO_DEV;
550 ret = dmaengine_slave_config(dma->chan_tx, &cfg);
551 if (ret) {
552 dev_err(dev, "can't configure tx dma channel\n");
553 ret = -EINVAL;
554 goto err_slave_config;
555 }
556
557 dspi->dma = dma;
558 init_completion(&dma->cmd_tx_complete);
559 init_completion(&dma->cmd_rx_complete);
560
561 return 0;
562
563err_slave_config:
564 dma_free_coherent(dma->chan_rx->device->dev,
565 dma_bufsize, dma->rx_dma_buf, dma->rx_dma_phys);
566err_rx_dma_buf:
567 dma_free_coherent(dma->chan_tx->device->dev,
568 dma_bufsize, dma->tx_dma_buf, dma->tx_dma_phys);
569err_tx_dma_buf:
570 dma_release_channel(dma->chan_tx);
571err_tx_channel:
572 dma_release_channel(dma->chan_rx);
573
574 devm_kfree(dev, dma);
575 dspi->dma = NULL;
576
577 return ret;
578}
579
580static void dspi_release_dma(struct fsl_dspi *dspi)
581{
582 int dma_bufsize = dspi->devtype_data->fifo_size * 2;
583 struct fsl_dspi_dma *dma = dspi->dma;
584
585 if (!dma)
586 return;
587
588 if (dma->chan_tx) {
589 dma_free_coherent(dma->chan_tx->device->dev, dma_bufsize,
590 dma->tx_dma_buf, dma->tx_dma_phys);
591 dma_release_channel(dma->chan_tx);
592 }
593
594 if (dma->chan_rx) {
595 dma_free_coherent(dma->chan_rx->device->dev, dma_bufsize,
596 dma->rx_dma_buf, dma->rx_dma_phys);
597 dma_release_channel(dma->chan_rx);
598 }
599}
600
601static void hz_to_spi_baud(char *pbr, char *br, int speed_hz,
602 unsigned long clkrate)
603{
604 /* Valid baud rate pre-scaler values */
605 int pbr_tbl[4] = {2, 3, 5, 7};
606 int brs[16] = { 2, 4, 6, 8,
607 16, 32, 64, 128,
608 256, 512, 1024, 2048,
609 4096, 8192, 16384, 32768 };
610 int scale_needed, scale, minscale = INT_MAX;
611 int i, j;
612
613 scale_needed = clkrate / speed_hz;
614 if (clkrate % speed_hz)
615 scale_needed++;
616
617 for (i = 0; i < ARRAY_SIZE(brs); i++)
618 for (j = 0; j < ARRAY_SIZE(pbr_tbl); j++) {
619 scale = brs[i] * pbr_tbl[j];
620 if (scale >= scale_needed) {
621 if (scale < minscale) {
622 minscale = scale;
623 *br = i;
624 *pbr = j;
625 }
626 break;
627 }
628 }
629
630 if (minscale == INT_MAX) {
631 pr_warn("Can not find valid baud rate,speed_hz is %d,clkrate is %ld, we use the max prescaler value.\n",
632 speed_hz, clkrate);
633 *pbr = ARRAY_SIZE(pbr_tbl) - 1;
634 *br = ARRAY_SIZE(brs) - 1;
635 }
636}
637
638static void ns_delay_scale(char *psc, char *sc, int delay_ns,
639 unsigned long clkrate)
640{
641 int scale_needed, scale, minscale = INT_MAX;
642 int pscale_tbl[4] = {1, 3, 5, 7};
643 u32 remainder;
644 int i, j;
645
646 scale_needed = div_u64_rem((u64)delay_ns * clkrate, NSEC_PER_SEC,
647 &remainder);
648 if (remainder)
649 scale_needed++;
650
651 for (i = 0; i < ARRAY_SIZE(pscale_tbl); i++)
652 for (j = 0; j <= SPI_CTAR_SCALE_BITS; j++) {
653 scale = pscale_tbl[i] * (2 << j);
654 if (scale >= scale_needed) {
655 if (scale < minscale) {
656 minscale = scale;
657 *psc = i;
658 *sc = j;
659 }
660 break;
661 }
662 }
663
664 if (minscale == INT_MAX) {
665 pr_warn("Cannot find correct scale values for %dns delay at clkrate %ld, using max prescaler value",
666 delay_ns, clkrate);
667 *psc = ARRAY_SIZE(pscale_tbl) - 1;
668 *sc = SPI_CTAR_SCALE_BITS;
669 }
670}
671
672static void dspi_pushr_cmd_write(struct fsl_dspi *dspi, u16 cmd)
673{
674 /*
675 * The only time when the PCS doesn't need continuation after this word
676 * is when it's last. We need to look ahead, because we actually call
677 * dspi_pop_tx (the function that decrements dspi->len) _after_
678 * dspi_pushr_cmd_write with XSPI mode. As for how much in advance? One
679 * word is enough. If there's more to transmit than that,
680 * dspi_xspi_write will know to split the FIFO writes in 2, and
681 * generate a new PUSHR command with the final word that will have PCS
682 * deasserted (not continued) here.
683 */
684 if (dspi->len > dspi->oper_word_size)
685 cmd |= SPI_PUSHR_CMD_CONT;
686 regmap_write(dspi->regmap_pushr, dspi->pushr_cmd, cmd);
687}
688
689static void dspi_pushr_txdata_write(struct fsl_dspi *dspi, u16 txdata)
690{
691 regmap_write(dspi->regmap_pushr, dspi->pushr_tx, txdata);
692}
693
694static void dspi_xspi_fifo_write(struct fsl_dspi *dspi, int num_words)
695{
696 int num_bytes = num_words * dspi->oper_word_size;
697 u16 tx_cmd = dspi->tx_cmd;
698
699 /*
700 * If the PCS needs to de-assert (i.e. we're at the end of the buffer
701 * and cs_change does not want the PCS to stay on), then we need a new
702 * PUSHR command, since this one (for the body of the buffer)
703 * necessarily has the CONT bit set.
704 * So send one word less during this go, to force a split and a command
705 * with a single word next time, when CONT will be unset.
706 */
707 if (!(dspi->tx_cmd & SPI_PUSHR_CMD_CONT) && num_bytes == dspi->len)
708 tx_cmd |= SPI_PUSHR_CMD_EOQ;
709
710 /* Update CTARE */
711 regmap_write(dspi->regmap, SPI_CTARE(0),
712 SPI_FRAME_EBITS(dspi->oper_bits_per_word) |
713 SPI_CTARE_DTCP(num_words));
714
715 /*
716 * Write the CMD FIFO entry first, and then the two
717 * corresponding TX FIFO entries (or one...).
718 */
719 dspi_pushr_cmd_write(dspi, tx_cmd);
720
721 /* Fill TX FIFO with as many transfers as possible */
722 while (num_words--) {
723 u32 data = dspi_pop_tx(dspi);
724
725 dspi_pushr_txdata_write(dspi, data & 0xFFFF);
726 if (dspi->oper_bits_per_word > 16)
727 dspi_pushr_txdata_write(dspi, data >> 16);
728 }
729}
730
731static u32 dspi_popr_read(struct fsl_dspi *dspi)
732{
733 u32 rxdata = 0;
734
735 regmap_read(dspi->regmap, SPI_POPR, &rxdata);
736 return rxdata;
737}
738
739static void dspi_fifo_read(struct fsl_dspi *dspi)
740{
741 int num_fifo_entries = dspi->words_in_flight;
742
743 /* Read one FIFO entry and push to rx buffer */
744 while (num_fifo_entries--)
745 dspi_push_rx(dspi, dspi_popr_read(dspi));
746}
747
748static void dspi_setup_accel(struct fsl_dspi *dspi)
749{
750 struct spi_transfer *xfer = dspi->cur_transfer;
751 bool odd = !!(dspi->len & 1);
752
753 /* No accel for frames not multiple of 8 bits at the moment */
754 if (xfer->bits_per_word % 8)
755 goto no_accel;
756
757 if (!odd && dspi->len <= dspi->devtype_data->fifo_size * 2) {
758 dspi->oper_bits_per_word = 16;
759 } else if (odd && dspi->len <= dspi->devtype_data->fifo_size) {
760 dspi->oper_bits_per_word = 8;
761 } else {
762 /* Start off with maximum supported by hardware */
763 if (dspi->devtype_data->trans_mode == DSPI_XSPI_MODE)
764 dspi->oper_bits_per_word = 32;
765 else
766 dspi->oper_bits_per_word = 16;
767
768 /*
769 * And go down only if the buffer can't be sent with
770 * words this big
771 */
772 do {
773 if (dspi->len >= DIV_ROUND_UP(dspi->oper_bits_per_word, 8))
774 break;
775
776 dspi->oper_bits_per_word /= 2;
777 } while (dspi->oper_bits_per_word > 8);
778 }
779
780 if (xfer->bits_per_word == 8 && dspi->oper_bits_per_word == 32) {
781 dspi->dev_to_host = dspi_8on32_dev_to_host;
782 dspi->host_to_dev = dspi_8on32_host_to_dev;
783 } else if (xfer->bits_per_word == 8 && dspi->oper_bits_per_word == 16) {
784 dspi->dev_to_host = dspi_8on16_dev_to_host;
785 dspi->host_to_dev = dspi_8on16_host_to_dev;
786 } else if (xfer->bits_per_word == 16 && dspi->oper_bits_per_word == 32) {
787 dspi->dev_to_host = dspi_16on32_dev_to_host;
788 dspi->host_to_dev = dspi_16on32_host_to_dev;
789 } else {
790no_accel:
791 dspi->dev_to_host = dspi_native_dev_to_host;
792 dspi->host_to_dev = dspi_native_host_to_dev;
793 dspi->oper_bits_per_word = xfer->bits_per_word;
794 }
795
796 dspi->oper_word_size = DIV_ROUND_UP(dspi->oper_bits_per_word, 8);
797
798 /*
799 * Update CTAR here (code is common for XSPI and DMA modes).
800 * We will update CTARE in the portion specific to XSPI, when we
801 * also know the preload value (DTCP).
802 */
803 regmap_write(dspi->regmap, SPI_CTAR(0),
804 dspi->cur_chip->ctar_val |
805 SPI_FRAME_BITS(dspi->oper_bits_per_word));
806}
807
808static void dspi_fifo_write(struct fsl_dspi *dspi)
809{
810 int num_fifo_entries = dspi->devtype_data->fifo_size;
811 struct spi_transfer *xfer = dspi->cur_transfer;
812 struct spi_message *msg = dspi->cur_msg;
813 int num_words, num_bytes;
814
815 dspi_setup_accel(dspi);
816
817 /* In XSPI mode each 32-bit word occupies 2 TX FIFO entries */
818 if (dspi->oper_word_size == 4)
819 num_fifo_entries /= 2;
820
821 /*
822 * Integer division intentionally trims off odd (or non-multiple of 4)
823 * numbers of bytes at the end of the buffer, which will be sent next
824 * time using a smaller oper_word_size.
825 */
826 num_words = dspi->len / dspi->oper_word_size;
827 if (num_words > num_fifo_entries)
828 num_words = num_fifo_entries;
829
830 /* Update total number of bytes that were transferred */
831 num_bytes = num_words * dspi->oper_word_size;
832 msg->actual_length += num_bytes;
833 dspi->progress += num_bytes / DIV_ROUND_UP(xfer->bits_per_word, 8);
834
835 /*
836 * Update shared variable for use in the next interrupt (both in
837 * dspi_fifo_read and in dspi_fifo_write).
838 */
839 dspi->words_in_flight = num_words;
840
841 spi_take_timestamp_pre(dspi->ctlr, xfer, dspi->progress, !dspi->irq);
842
843 dspi_xspi_fifo_write(dspi, num_words);
844 /*
845 * Everything after this point is in a potential race with the next
846 * interrupt, so we must never use dspi->words_in_flight again since it
847 * might already be modified by the next dspi_fifo_write.
848 */
849
850 spi_take_timestamp_post(dspi->ctlr, dspi->cur_transfer,
851 dspi->progress, !dspi->irq);
852}
853
854static int dspi_rxtx(struct fsl_dspi *dspi)
855{
856 dspi_fifo_read(dspi);
857
858 if (!dspi->len)
859 /* Success! */
860 return 0;
861
862 dspi_fifo_write(dspi);
863
864 return -EINPROGRESS;
865}
866
867static int dspi_poll(struct fsl_dspi *dspi)
868{
869 int tries = 1000;
870 u32 spi_sr;
871
872 do {
873 regmap_read(dspi->regmap, SPI_SR, &spi_sr);
874 regmap_write(dspi->regmap, SPI_SR, spi_sr);
875
876 if (spi_sr & SPI_SR_CMDTCF)
877 break;
878 } while (--tries);
879
880 if (!tries)
881 return -ETIMEDOUT;
882
883 return dspi_rxtx(dspi);
884}
885
886static irqreturn_t dspi_interrupt(int irq, void *dev_id)
887{
888 struct fsl_dspi *dspi = (struct fsl_dspi *)dev_id;
889 u32 spi_sr;
890
891 regmap_read(dspi->regmap, SPI_SR, &spi_sr);
892 regmap_write(dspi->regmap, SPI_SR, spi_sr);
893
894 if (!(spi_sr & SPI_SR_CMDTCF))
895 return IRQ_NONE;
896
897 if (dspi_rxtx(dspi) == 0)
898 complete(&dspi->xfer_done);
899
900 return IRQ_HANDLED;
901}
902
903static void dspi_assert_cs(struct spi_device *spi, bool *cs)
904{
905 if (!spi_get_csgpiod(spi, 0) || *cs)
906 return;
907
908 gpiod_set_value_cansleep(spi_get_csgpiod(spi, 0), true);
909 *cs = true;
910}
911
912static void dspi_deassert_cs(struct spi_device *spi, bool *cs)
913{
914 if (!spi_get_csgpiod(spi, 0) || !*cs)
915 return;
916
917 gpiod_set_value_cansleep(spi_get_csgpiod(spi, 0), false);
918 *cs = false;
919}
920
921static int dspi_transfer_one_message(struct spi_controller *ctlr,
922 struct spi_message *message)
923{
924 struct fsl_dspi *dspi = spi_controller_get_devdata(ctlr);
925 struct spi_device *spi = message->spi;
926 struct spi_transfer *transfer;
927 bool cs = false;
928 int status = 0;
929
930 message->actual_length = 0;
931
932 list_for_each_entry(transfer, &message->transfers, transfer_list) {
933 dspi->cur_transfer = transfer;
934 dspi->cur_msg = message;
935 dspi->cur_chip = spi_get_ctldata(spi);
936
937 dspi_assert_cs(spi, &cs);
938
939 /* Prepare command word for CMD FIFO */
940 dspi->tx_cmd = SPI_PUSHR_CMD_CTAS(0);
941 if (!spi_get_csgpiod(spi, 0))
942 dspi->tx_cmd |= SPI_PUSHR_CMD_PCS(spi_get_chipselect(spi, 0));
943
944 if (list_is_last(&dspi->cur_transfer->transfer_list,
945 &dspi->cur_msg->transfers)) {
946 /* Leave PCS activated after last transfer when
947 * cs_change is set.
948 */
949 if (transfer->cs_change)
950 dspi->tx_cmd |= SPI_PUSHR_CMD_CONT;
951 } else {
952 /* Keep PCS active between transfers in same message
953 * when cs_change is not set, and de-activate PCS
954 * between transfers in the same message when
955 * cs_change is set.
956 */
957 if (!transfer->cs_change)
958 dspi->tx_cmd |= SPI_PUSHR_CMD_CONT;
959 }
960
961 dspi->tx = transfer->tx_buf;
962 dspi->rx = transfer->rx_buf;
963 dspi->len = transfer->len;
964 dspi->progress = 0;
965
966 regmap_update_bits(dspi->regmap, SPI_MCR,
967 SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF,
968 SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF);
969
970 spi_take_timestamp_pre(dspi->ctlr, dspi->cur_transfer,
971 dspi->progress, !dspi->irq);
972
973 if (dspi->devtype_data->trans_mode == DSPI_DMA_MODE) {
974 status = dspi_dma_xfer(dspi);
975 } else {
976 dspi_fifo_write(dspi);
977
978 if (dspi->irq) {
979 wait_for_completion(&dspi->xfer_done);
980 reinit_completion(&dspi->xfer_done);
981 } else {
982 do {
983 status = dspi_poll(dspi);
984 } while (status == -EINPROGRESS);
985 }
986 }
987 if (status)
988 break;
989
990 spi_transfer_delay_exec(transfer);
991
992 if (!(dspi->tx_cmd & SPI_PUSHR_CMD_CONT))
993 dspi_deassert_cs(spi, &cs);
994 }
995
996 message->status = status;
997 spi_finalize_current_message(ctlr);
998
999 return status;
1000}
1001
1002static int dspi_setup(struct spi_device *spi)
1003{
1004 struct fsl_dspi *dspi = spi_controller_get_devdata(spi->controller);
1005 u32 period_ns = DIV_ROUND_UP(NSEC_PER_SEC, spi->max_speed_hz);
1006 unsigned char br = 0, pbr = 0, pcssck = 0, cssck = 0;
1007 u32 quarter_period_ns = DIV_ROUND_UP(period_ns, 4);
1008 u32 cs_sck_delay = 0, sck_cs_delay = 0;
1009 struct fsl_dspi_platform_data *pdata;
1010 unsigned char pasc = 0, asc = 0;
1011 struct chip_data *chip;
1012 unsigned long clkrate;
1013 bool cs = true;
1014
1015 /* Only alloc on first setup */
1016 chip = spi_get_ctldata(spi);
1017 if (chip == NULL) {
1018 chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
1019 if (!chip)
1020 return -ENOMEM;
1021 }
1022
1023 pdata = dev_get_platdata(&dspi->pdev->dev);
1024
1025 if (!pdata) {
1026 of_property_read_u32(spi->dev.of_node, "fsl,spi-cs-sck-delay",
1027 &cs_sck_delay);
1028
1029 of_property_read_u32(spi->dev.of_node, "fsl,spi-sck-cs-delay",
1030 &sck_cs_delay);
1031 } else {
1032 cs_sck_delay = pdata->cs_sck_delay;
1033 sck_cs_delay = pdata->sck_cs_delay;
1034 }
1035
1036 /* Since tCSC and tASC apply to continuous transfers too, avoid SCK
1037 * glitches of half a cycle by never allowing tCSC + tASC to go below
1038 * half a SCK period.
1039 */
1040 if (cs_sck_delay < quarter_period_ns)
1041 cs_sck_delay = quarter_period_ns;
1042 if (sck_cs_delay < quarter_period_ns)
1043 sck_cs_delay = quarter_period_ns;
1044
1045 dev_dbg(&spi->dev,
1046 "DSPI controller timing params: CS-to-SCK delay %u ns, SCK-to-CS delay %u ns\n",
1047 cs_sck_delay, sck_cs_delay);
1048
1049 clkrate = clk_get_rate(dspi->clk);
1050 hz_to_spi_baud(&pbr, &br, spi->max_speed_hz, clkrate);
1051
1052 /* Set PCS to SCK delay scale values */
1053 ns_delay_scale(&pcssck, &cssck, cs_sck_delay, clkrate);
1054
1055 /* Set After SCK delay scale values */
1056 ns_delay_scale(&pasc, &asc, sck_cs_delay, clkrate);
1057
1058 chip->ctar_val = 0;
1059 if (spi->mode & SPI_CPOL)
1060 chip->ctar_val |= SPI_CTAR_CPOL;
1061 if (spi->mode & SPI_CPHA)
1062 chip->ctar_val |= SPI_CTAR_CPHA;
1063
1064 if (!spi_controller_is_target(dspi->ctlr)) {
1065 chip->ctar_val |= SPI_CTAR_PCSSCK(pcssck) |
1066 SPI_CTAR_CSSCK(cssck) |
1067 SPI_CTAR_PASC(pasc) |
1068 SPI_CTAR_ASC(asc) |
1069 SPI_CTAR_PBR(pbr) |
1070 SPI_CTAR_BR(br);
1071
1072 if (spi->mode & SPI_LSB_FIRST)
1073 chip->ctar_val |= SPI_CTAR_LSBFE;
1074 }
1075
1076 gpiod_direction_output(spi_get_csgpiod(spi, 0), false);
1077 dspi_deassert_cs(spi, &cs);
1078
1079 spi_set_ctldata(spi, chip);
1080
1081 return 0;
1082}
1083
1084static void dspi_cleanup(struct spi_device *spi)
1085{
1086 struct chip_data *chip = spi_get_ctldata(spi);
1087
1088 dev_dbg(&spi->dev, "spi_device %u.%u cleanup\n",
1089 spi->controller->bus_num, spi_get_chipselect(spi, 0));
1090
1091 kfree(chip);
1092}
1093
1094static const struct of_device_id fsl_dspi_dt_ids[] = {
1095 {
1096 .compatible = "fsl,vf610-dspi",
1097 .data = &devtype_data[VF610],
1098 }, {
1099 .compatible = "fsl,ls1021a-v1.0-dspi",
1100 .data = &devtype_data[LS1021A],
1101 }, {
1102 .compatible = "fsl,ls1012a-dspi",
1103 .data = &devtype_data[LS1012A],
1104 }, {
1105 .compatible = "fsl,ls1028a-dspi",
1106 .data = &devtype_data[LS1028A],
1107 }, {
1108 .compatible = "fsl,ls1043a-dspi",
1109 .data = &devtype_data[LS1043A],
1110 }, {
1111 .compatible = "fsl,ls1046a-dspi",
1112 .data = &devtype_data[LS1046A],
1113 }, {
1114 .compatible = "fsl,ls2080a-dspi",
1115 .data = &devtype_data[LS2080A],
1116 }, {
1117 .compatible = "fsl,ls2085a-dspi",
1118 .data = &devtype_data[LS2085A],
1119 }, {
1120 .compatible = "fsl,lx2160a-dspi",
1121 .data = &devtype_data[LX2160A],
1122 },
1123 { /* sentinel */ }
1124};
1125MODULE_DEVICE_TABLE(of, fsl_dspi_dt_ids);
1126
1127#ifdef CONFIG_PM_SLEEP
1128static int dspi_suspend(struct device *dev)
1129{
1130 struct fsl_dspi *dspi = dev_get_drvdata(dev);
1131
1132 if (dspi->irq)
1133 disable_irq(dspi->irq);
1134 spi_controller_suspend(dspi->ctlr);
1135 clk_disable_unprepare(dspi->clk);
1136
1137 pinctrl_pm_select_sleep_state(dev);
1138
1139 return 0;
1140}
1141
1142static int dspi_resume(struct device *dev)
1143{
1144 struct fsl_dspi *dspi = dev_get_drvdata(dev);
1145 int ret;
1146
1147 pinctrl_pm_select_default_state(dev);
1148
1149 ret = clk_prepare_enable(dspi->clk);
1150 if (ret)
1151 return ret;
1152 spi_controller_resume(dspi->ctlr);
1153 if (dspi->irq)
1154 enable_irq(dspi->irq);
1155
1156 return 0;
1157}
1158#endif /* CONFIG_PM_SLEEP */
1159
1160static SIMPLE_DEV_PM_OPS(dspi_pm, dspi_suspend, dspi_resume);
1161
1162static const struct regmap_range dspi_volatile_ranges[] = {
1163 regmap_reg_range(SPI_MCR, SPI_TCR),
1164 regmap_reg_range(SPI_SR, SPI_SR),
1165 regmap_reg_range(SPI_PUSHR, SPI_RXFR3),
1166};
1167
1168static const struct regmap_access_table dspi_volatile_table = {
1169 .yes_ranges = dspi_volatile_ranges,
1170 .n_yes_ranges = ARRAY_SIZE(dspi_volatile_ranges),
1171};
1172
1173static const struct regmap_config dspi_regmap_config = {
1174 .reg_bits = 32,
1175 .val_bits = 32,
1176 .reg_stride = 4,
1177 .max_register = 0x88,
1178 .volatile_table = &dspi_volatile_table,
1179};
1180
1181static const struct regmap_range dspi_xspi_volatile_ranges[] = {
1182 regmap_reg_range(SPI_MCR, SPI_TCR),
1183 regmap_reg_range(SPI_SR, SPI_SR),
1184 regmap_reg_range(SPI_PUSHR, SPI_RXFR3),
1185 regmap_reg_range(SPI_SREX, SPI_SREX),
1186};
1187
1188static const struct regmap_access_table dspi_xspi_volatile_table = {
1189 .yes_ranges = dspi_xspi_volatile_ranges,
1190 .n_yes_ranges = ARRAY_SIZE(dspi_xspi_volatile_ranges),
1191};
1192
1193static const struct regmap_config dspi_xspi_regmap_config[] = {
1194 {
1195 .reg_bits = 32,
1196 .val_bits = 32,
1197 .reg_stride = 4,
1198 .max_register = 0x13c,
1199 .volatile_table = &dspi_xspi_volatile_table,
1200 },
1201 {
1202 .name = "pushr",
1203 .reg_bits = 16,
1204 .val_bits = 16,
1205 .reg_stride = 2,
1206 .max_register = 0x2,
1207 },
1208};
1209
1210static int dspi_init(struct fsl_dspi *dspi)
1211{
1212 unsigned int mcr;
1213
1214 /* Set idle states for all chip select signals to high */
1215 mcr = SPI_MCR_PCSIS(GENMASK(dspi->ctlr->max_native_cs - 1, 0));
1216
1217 if (dspi->devtype_data->trans_mode == DSPI_XSPI_MODE)
1218 mcr |= SPI_MCR_XSPI;
1219 if (!spi_controller_is_target(dspi->ctlr))
1220 mcr |= SPI_MCR_HOST;
1221
1222 regmap_write(dspi->regmap, SPI_MCR, mcr);
1223 regmap_write(dspi->regmap, SPI_SR, SPI_SR_CLEAR);
1224
1225 switch (dspi->devtype_data->trans_mode) {
1226 case DSPI_XSPI_MODE:
1227 regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_CMDTCFE);
1228 break;
1229 case DSPI_DMA_MODE:
1230 regmap_write(dspi->regmap, SPI_RSER,
1231 SPI_RSER_TFFFE | SPI_RSER_TFFFD |
1232 SPI_RSER_RFDFE | SPI_RSER_RFDFD);
1233 break;
1234 default:
1235 dev_err(&dspi->pdev->dev, "unsupported trans_mode %u\n",
1236 dspi->devtype_data->trans_mode);
1237 return -EINVAL;
1238 }
1239
1240 return 0;
1241}
1242
1243static int dspi_target_abort(struct spi_controller *host)
1244{
1245 struct fsl_dspi *dspi = spi_controller_get_devdata(host);
1246
1247 /*
1248 * Terminate all pending DMA transactions for the SPI working
1249 * in TARGET mode.
1250 */
1251 if (dspi->devtype_data->trans_mode == DSPI_DMA_MODE) {
1252 dmaengine_terminate_sync(dspi->dma->chan_rx);
1253 dmaengine_terminate_sync(dspi->dma->chan_tx);
1254 }
1255
1256 /* Clear the internal DSPI RX and TX FIFO buffers */
1257 regmap_update_bits(dspi->regmap, SPI_MCR,
1258 SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF,
1259 SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF);
1260
1261 return 0;
1262}
1263
1264static int dspi_probe(struct platform_device *pdev)
1265{
1266 struct device_node *np = pdev->dev.of_node;
1267 const struct regmap_config *regmap_config;
1268 struct fsl_dspi_platform_data *pdata;
1269 struct spi_controller *ctlr;
1270 int ret, cs_num, bus_num = -1;
1271 struct fsl_dspi *dspi;
1272 struct resource *res;
1273 void __iomem *base;
1274 bool big_endian;
1275
1276 dspi = devm_kzalloc(&pdev->dev, sizeof(*dspi), GFP_KERNEL);
1277 if (!dspi)
1278 return -ENOMEM;
1279
1280 ctlr = spi_alloc_host(&pdev->dev, 0);
1281 if (!ctlr)
1282 return -ENOMEM;
1283
1284 spi_controller_set_devdata(ctlr, dspi);
1285 platform_set_drvdata(pdev, dspi);
1286
1287 dspi->pdev = pdev;
1288 dspi->ctlr = ctlr;
1289
1290 ctlr->setup = dspi_setup;
1291 ctlr->transfer_one_message = dspi_transfer_one_message;
1292 ctlr->dev.of_node = pdev->dev.of_node;
1293
1294 ctlr->cleanup = dspi_cleanup;
1295 ctlr->target_abort = dspi_target_abort;
1296 ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;
1297 ctlr->use_gpio_descriptors = true;
1298
1299 pdata = dev_get_platdata(&pdev->dev);
1300 if (pdata) {
1301 ctlr->num_chipselect = ctlr->max_native_cs = pdata->cs_num;
1302 ctlr->bus_num = pdata->bus_num;
1303
1304 /* Only Coldfire uses platform data */
1305 dspi->devtype_data = &devtype_data[MCF5441X];
1306 big_endian = true;
1307 } else {
1308
1309 ret = of_property_read_u32(np, "spi-num-chipselects", &cs_num);
1310 if (ret < 0) {
1311 dev_err(&pdev->dev, "can't get spi-num-chipselects\n");
1312 goto out_ctlr_put;
1313 }
1314 ctlr->num_chipselect = ctlr->max_native_cs = cs_num;
1315
1316 of_property_read_u32(np, "bus-num", &bus_num);
1317 ctlr->bus_num = bus_num;
1318
1319 if (of_property_read_bool(np, "spi-slave"))
1320 ctlr->target = true;
1321
1322 dspi->devtype_data = of_device_get_match_data(&pdev->dev);
1323 if (!dspi->devtype_data) {
1324 dev_err(&pdev->dev, "can't get devtype_data\n");
1325 ret = -EFAULT;
1326 goto out_ctlr_put;
1327 }
1328
1329 big_endian = of_device_is_big_endian(np);
1330 }
1331 if (big_endian) {
1332 dspi->pushr_cmd = 0;
1333 dspi->pushr_tx = 2;
1334 } else {
1335 dspi->pushr_cmd = 2;
1336 dspi->pushr_tx = 0;
1337 }
1338
1339 if (dspi->devtype_data->trans_mode == DSPI_XSPI_MODE)
1340 ctlr->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
1341 else
1342 ctlr->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
1343
1344 base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
1345 if (IS_ERR(base)) {
1346 ret = PTR_ERR(base);
1347 goto out_ctlr_put;
1348 }
1349
1350 if (dspi->devtype_data->trans_mode == DSPI_XSPI_MODE)
1351 regmap_config = &dspi_xspi_regmap_config[0];
1352 else
1353 regmap_config = &dspi_regmap_config;
1354 dspi->regmap = devm_regmap_init_mmio(&pdev->dev, base, regmap_config);
1355 if (IS_ERR(dspi->regmap)) {
1356 dev_err(&pdev->dev, "failed to init regmap: %ld\n",
1357 PTR_ERR(dspi->regmap));
1358 ret = PTR_ERR(dspi->regmap);
1359 goto out_ctlr_put;
1360 }
1361
1362 if (dspi->devtype_data->trans_mode == DSPI_XSPI_MODE) {
1363 dspi->regmap_pushr = devm_regmap_init_mmio(
1364 &pdev->dev, base + SPI_PUSHR,
1365 &dspi_xspi_regmap_config[1]);
1366 if (IS_ERR(dspi->regmap_pushr)) {
1367 dev_err(&pdev->dev,
1368 "failed to init pushr regmap: %ld\n",
1369 PTR_ERR(dspi->regmap_pushr));
1370 ret = PTR_ERR(dspi->regmap_pushr);
1371 goto out_ctlr_put;
1372 }
1373 }
1374
1375 dspi->clk = devm_clk_get_enabled(&pdev->dev, "dspi");
1376 if (IS_ERR(dspi->clk)) {
1377 ret = PTR_ERR(dspi->clk);
1378 dev_err(&pdev->dev, "unable to get clock\n");
1379 goto out_ctlr_put;
1380 }
1381
1382 ret = dspi_init(dspi);
1383 if (ret)
1384 goto out_ctlr_put;
1385
1386 dspi->irq = platform_get_irq(pdev, 0);
1387 if (dspi->irq <= 0) {
1388 dev_info(&pdev->dev,
1389 "can't get platform irq, using poll mode\n");
1390 dspi->irq = 0;
1391 goto poll_mode;
1392 }
1393
1394 init_completion(&dspi->xfer_done);
1395
1396 ret = request_threaded_irq(dspi->irq, dspi_interrupt, NULL,
1397 IRQF_SHARED, pdev->name, dspi);
1398 if (ret < 0) {
1399 dev_err(&pdev->dev, "Unable to attach DSPI interrupt\n");
1400 goto out_ctlr_put;
1401 }
1402
1403poll_mode:
1404
1405 if (dspi->devtype_data->trans_mode == DSPI_DMA_MODE) {
1406 ret = dspi_request_dma(dspi, res->start);
1407 if (ret < 0) {
1408 dev_err(&pdev->dev, "can't get dma channels\n");
1409 goto out_free_irq;
1410 }
1411 }
1412
1413 ctlr->max_speed_hz =
1414 clk_get_rate(dspi->clk) / dspi->devtype_data->max_clock_factor;
1415
1416 if (dspi->devtype_data->trans_mode != DSPI_DMA_MODE)
1417 ctlr->ptp_sts_supported = true;
1418
1419 ret = spi_register_controller(ctlr);
1420 if (ret != 0) {
1421 dev_err(&pdev->dev, "Problem registering DSPI ctlr\n");
1422 goto out_release_dma;
1423 }
1424
1425 return ret;
1426
1427out_release_dma:
1428 dspi_release_dma(dspi);
1429out_free_irq:
1430 if (dspi->irq)
1431 free_irq(dspi->irq, dspi);
1432out_ctlr_put:
1433 spi_controller_put(ctlr);
1434
1435 return ret;
1436}
1437
1438static void dspi_remove(struct platform_device *pdev)
1439{
1440 struct fsl_dspi *dspi = platform_get_drvdata(pdev);
1441
1442 /* Disconnect from the SPI framework */
1443 spi_unregister_controller(dspi->ctlr);
1444
1445 /* Disable RX and TX */
1446 regmap_update_bits(dspi->regmap, SPI_MCR,
1447 SPI_MCR_DIS_TXF | SPI_MCR_DIS_RXF,
1448 SPI_MCR_DIS_TXF | SPI_MCR_DIS_RXF);
1449
1450 /* Stop Running */
1451 regmap_update_bits(dspi->regmap, SPI_MCR, SPI_MCR_HALT, SPI_MCR_HALT);
1452
1453 dspi_release_dma(dspi);
1454 if (dspi->irq)
1455 free_irq(dspi->irq, dspi);
1456}
1457
1458static void dspi_shutdown(struct platform_device *pdev)
1459{
1460 dspi_remove(pdev);
1461}
1462
1463static struct platform_driver fsl_dspi_driver = {
1464 .driver.name = DRIVER_NAME,
1465 .driver.of_match_table = fsl_dspi_dt_ids,
1466 .driver.owner = THIS_MODULE,
1467 .driver.pm = &dspi_pm,
1468 .probe = dspi_probe,
1469 .remove_new = dspi_remove,
1470 .shutdown = dspi_shutdown,
1471};
1472module_platform_driver(fsl_dspi_driver);
1473
1474MODULE_DESCRIPTION("Freescale DSPI Controller Driver");
1475MODULE_LICENSE("GPL");
1476MODULE_ALIAS("platform:" DRIVER_NAME);
1/*
2 * drivers/spi/spi-fsl-dspi.c
3 *
4 * Copyright 2013 Freescale Semiconductor, Inc.
5 *
6 * Freescale DSPI driver
7 * This file contains a driver for the Freescale DSPI
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; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 */
15
16#include <linux/clk.h>
17#include <linux/delay.h>
18#include <linux/dmaengine.h>
19#include <linux/dma-mapping.h>
20#include <linux/err.h>
21#include <linux/errno.h>
22#include <linux/interrupt.h>
23#include <linux/io.h>
24#include <linux/kernel.h>
25#include <linux/math64.h>
26#include <linux/module.h>
27#include <linux/of.h>
28#include <linux/of_device.h>
29#include <linux/pinctrl/consumer.h>
30#include <linux/platform_device.h>
31#include <linux/pm_runtime.h>
32#include <linux/regmap.h>
33#include <linux/sched.h>
34#include <linux/spi/spi.h>
35#include <linux/spi/spi-fsl-dspi.h>
36#include <linux/spi/spi_bitbang.h>
37#include <linux/time.h>
38
39#define DRIVER_NAME "fsl-dspi"
40
41#define TRAN_STATE_RX_VOID 0x01
42#define TRAN_STATE_TX_VOID 0x02
43#define TRAN_STATE_WORD_ODD_NUM 0x04
44
45#define DSPI_FIFO_SIZE 4
46#define DSPI_DMA_BUFSIZE (DSPI_FIFO_SIZE * 1024)
47
48#define SPI_MCR 0x00
49#define SPI_MCR_MASTER (1 << 31)
50#define SPI_MCR_PCSIS (0x3F << 16)
51#define SPI_MCR_CLR_TXF (1 << 11)
52#define SPI_MCR_CLR_RXF (1 << 10)
53
54#define SPI_TCR 0x08
55#define SPI_TCR_GET_TCNT(x) (((x) & 0xffff0000) >> 16)
56
57#define SPI_CTAR(x) (0x0c + (((x) & 0x3) * 4))
58#define SPI_CTAR_FMSZ(x) (((x) & 0x0000000f) << 27)
59#define SPI_CTAR_CPOL(x) ((x) << 26)
60#define SPI_CTAR_CPHA(x) ((x) << 25)
61#define SPI_CTAR_LSBFE(x) ((x) << 24)
62#define SPI_CTAR_PCSSCK(x) (((x) & 0x00000003) << 22)
63#define SPI_CTAR_PASC(x) (((x) & 0x00000003) << 20)
64#define SPI_CTAR_PDT(x) (((x) & 0x00000003) << 18)
65#define SPI_CTAR_PBR(x) (((x) & 0x00000003) << 16)
66#define SPI_CTAR_CSSCK(x) (((x) & 0x0000000f) << 12)
67#define SPI_CTAR_ASC(x) (((x) & 0x0000000f) << 8)
68#define SPI_CTAR_DT(x) (((x) & 0x0000000f) << 4)
69#define SPI_CTAR_BR(x) ((x) & 0x0000000f)
70#define SPI_CTAR_SCALE_BITS 0xf
71
72#define SPI_CTAR0_SLAVE 0x0c
73
74#define SPI_SR 0x2c
75#define SPI_SR_EOQF 0x10000000
76#define SPI_SR_TCFQF 0x80000000
77#define SPI_SR_CLEAR 0xdaad0000
78
79#define SPI_RSER_TFFFE BIT(25)
80#define SPI_RSER_TFFFD BIT(24)
81#define SPI_RSER_RFDFE BIT(17)
82#define SPI_RSER_RFDFD BIT(16)
83
84#define SPI_RSER 0x30
85#define SPI_RSER_EOQFE 0x10000000
86#define SPI_RSER_TCFQE 0x80000000
87
88#define SPI_PUSHR 0x34
89#define SPI_PUSHR_CONT (1 << 31)
90#define SPI_PUSHR_CTAS(x) (((x) & 0x00000003) << 28)
91#define SPI_PUSHR_EOQ (1 << 27)
92#define SPI_PUSHR_CTCNT (1 << 26)
93#define SPI_PUSHR_PCS(x) (((1 << x) & 0x0000003f) << 16)
94#define SPI_PUSHR_TXDATA(x) ((x) & 0x0000ffff)
95
96#define SPI_PUSHR_SLAVE 0x34
97
98#define SPI_POPR 0x38
99#define SPI_POPR_RXDATA(x) ((x) & 0x0000ffff)
100
101#define SPI_TXFR0 0x3c
102#define SPI_TXFR1 0x40
103#define SPI_TXFR2 0x44
104#define SPI_TXFR3 0x48
105#define SPI_RXFR0 0x7c
106#define SPI_RXFR1 0x80
107#define SPI_RXFR2 0x84
108#define SPI_RXFR3 0x88
109
110#define SPI_FRAME_BITS(bits) SPI_CTAR_FMSZ((bits) - 1)
111#define SPI_FRAME_BITS_MASK SPI_CTAR_FMSZ(0xf)
112#define SPI_FRAME_BITS_16 SPI_CTAR_FMSZ(0xf)
113#define SPI_FRAME_BITS_8 SPI_CTAR_FMSZ(0x7)
114
115#define SPI_CS_INIT 0x01
116#define SPI_CS_ASSERT 0x02
117#define SPI_CS_DROP 0x04
118
119#define SPI_TCR_TCNT_MAX 0x10000
120
121#define DMA_COMPLETION_TIMEOUT msecs_to_jiffies(3000)
122
123struct chip_data {
124 u32 mcr_val;
125 u32 ctar_val;
126 u16 void_write_data;
127};
128
129enum dspi_trans_mode {
130 DSPI_EOQ_MODE = 0,
131 DSPI_TCFQ_MODE,
132 DSPI_DMA_MODE,
133};
134
135struct fsl_dspi_devtype_data {
136 enum dspi_trans_mode trans_mode;
137 u8 max_clock_factor;
138};
139
140static const struct fsl_dspi_devtype_data vf610_data = {
141 .trans_mode = DSPI_DMA_MODE,
142 .max_clock_factor = 2,
143};
144
145static const struct fsl_dspi_devtype_data ls1021a_v1_data = {
146 .trans_mode = DSPI_TCFQ_MODE,
147 .max_clock_factor = 8,
148};
149
150static const struct fsl_dspi_devtype_data ls2085a_data = {
151 .trans_mode = DSPI_TCFQ_MODE,
152 .max_clock_factor = 8,
153};
154
155static const struct fsl_dspi_devtype_data coldfire_data = {
156 .trans_mode = DSPI_EOQ_MODE,
157 .max_clock_factor = 8,
158};
159
160struct fsl_dspi_dma {
161 /* Length of transfer in words of DSPI_FIFO_SIZE */
162 u32 curr_xfer_len;
163
164 u32 *tx_dma_buf;
165 struct dma_chan *chan_tx;
166 dma_addr_t tx_dma_phys;
167 struct completion cmd_tx_complete;
168 struct dma_async_tx_descriptor *tx_desc;
169
170 u32 *rx_dma_buf;
171 struct dma_chan *chan_rx;
172 dma_addr_t rx_dma_phys;
173 struct completion cmd_rx_complete;
174 struct dma_async_tx_descriptor *rx_desc;
175};
176
177struct fsl_dspi {
178 struct spi_master *master;
179 struct platform_device *pdev;
180
181 struct regmap *regmap;
182 int irq;
183 struct clk *clk;
184
185 struct spi_transfer *cur_transfer;
186 struct spi_message *cur_msg;
187 struct chip_data *cur_chip;
188 size_t len;
189 void *tx;
190 void *tx_end;
191 void *rx;
192 void *rx_end;
193 char dataflags;
194 u8 cs;
195 u16 void_write_data;
196 u32 cs_change;
197 const struct fsl_dspi_devtype_data *devtype_data;
198
199 wait_queue_head_t waitq;
200 u32 waitflags;
201
202 u32 spi_tcnt;
203 struct fsl_dspi_dma *dma;
204};
205
206static u32 dspi_data_to_pushr(struct fsl_dspi *dspi, int tx_word);
207
208static inline int is_double_byte_mode(struct fsl_dspi *dspi)
209{
210 unsigned int val;
211
212 regmap_read(dspi->regmap, SPI_CTAR(0), &val);
213
214 return ((val & SPI_FRAME_BITS_MASK) == SPI_FRAME_BITS(8)) ? 0 : 1;
215}
216
217static void dspi_tx_dma_callback(void *arg)
218{
219 struct fsl_dspi *dspi = arg;
220 struct fsl_dspi_dma *dma = dspi->dma;
221
222 complete(&dma->cmd_tx_complete);
223}
224
225static void dspi_rx_dma_callback(void *arg)
226{
227 struct fsl_dspi *dspi = arg;
228 struct fsl_dspi_dma *dma = dspi->dma;
229 int rx_word;
230 int i;
231 u16 d;
232
233 rx_word = is_double_byte_mode(dspi);
234
235 if (!(dspi->dataflags & TRAN_STATE_RX_VOID)) {
236 for (i = 0; i < dma->curr_xfer_len; i++) {
237 d = dspi->dma->rx_dma_buf[i];
238 rx_word ? (*(u16 *)dspi->rx = d) :
239 (*(u8 *)dspi->rx = d);
240 dspi->rx += rx_word + 1;
241 }
242 }
243
244 complete(&dma->cmd_rx_complete);
245}
246
247static int dspi_next_xfer_dma_submit(struct fsl_dspi *dspi)
248{
249 struct fsl_dspi_dma *dma = dspi->dma;
250 struct device *dev = &dspi->pdev->dev;
251 int time_left;
252 int tx_word;
253 int i;
254
255 tx_word = is_double_byte_mode(dspi);
256
257 for (i = 0; i < dma->curr_xfer_len; i++) {
258 dspi->dma->tx_dma_buf[i] = dspi_data_to_pushr(dspi, tx_word);
259 if ((dspi->cs_change) && (!dspi->len))
260 dspi->dma->tx_dma_buf[i] &= ~SPI_PUSHR_CONT;
261 }
262
263 dma->tx_desc = dmaengine_prep_slave_single(dma->chan_tx,
264 dma->tx_dma_phys,
265 dma->curr_xfer_len *
266 DMA_SLAVE_BUSWIDTH_4_BYTES,
267 DMA_MEM_TO_DEV,
268 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
269 if (!dma->tx_desc) {
270 dev_err(dev, "Not able to get desc for DMA xfer\n");
271 return -EIO;
272 }
273
274 dma->tx_desc->callback = dspi_tx_dma_callback;
275 dma->tx_desc->callback_param = dspi;
276 if (dma_submit_error(dmaengine_submit(dma->tx_desc))) {
277 dev_err(dev, "DMA submit failed\n");
278 return -EINVAL;
279 }
280
281 dma->rx_desc = dmaengine_prep_slave_single(dma->chan_rx,
282 dma->rx_dma_phys,
283 dma->curr_xfer_len *
284 DMA_SLAVE_BUSWIDTH_4_BYTES,
285 DMA_DEV_TO_MEM,
286 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
287 if (!dma->rx_desc) {
288 dev_err(dev, "Not able to get desc for DMA xfer\n");
289 return -EIO;
290 }
291
292 dma->rx_desc->callback = dspi_rx_dma_callback;
293 dma->rx_desc->callback_param = dspi;
294 if (dma_submit_error(dmaengine_submit(dma->rx_desc))) {
295 dev_err(dev, "DMA submit failed\n");
296 return -EINVAL;
297 }
298
299 reinit_completion(&dspi->dma->cmd_rx_complete);
300 reinit_completion(&dspi->dma->cmd_tx_complete);
301
302 dma_async_issue_pending(dma->chan_rx);
303 dma_async_issue_pending(dma->chan_tx);
304
305 time_left = wait_for_completion_timeout(&dspi->dma->cmd_tx_complete,
306 DMA_COMPLETION_TIMEOUT);
307 if (time_left == 0) {
308 dev_err(dev, "DMA tx timeout\n");
309 dmaengine_terminate_all(dma->chan_tx);
310 dmaengine_terminate_all(dma->chan_rx);
311 return -ETIMEDOUT;
312 }
313
314 time_left = wait_for_completion_timeout(&dspi->dma->cmd_rx_complete,
315 DMA_COMPLETION_TIMEOUT);
316 if (time_left == 0) {
317 dev_err(dev, "DMA rx timeout\n");
318 dmaengine_terminate_all(dma->chan_tx);
319 dmaengine_terminate_all(dma->chan_rx);
320 return -ETIMEDOUT;
321 }
322
323 return 0;
324}
325
326static int dspi_dma_xfer(struct fsl_dspi *dspi)
327{
328 struct fsl_dspi_dma *dma = dspi->dma;
329 struct device *dev = &dspi->pdev->dev;
330 int curr_remaining_bytes;
331 int bytes_per_buffer;
332 int word = 1;
333 int ret = 0;
334
335 if (is_double_byte_mode(dspi))
336 word = 2;
337 curr_remaining_bytes = dspi->len;
338 bytes_per_buffer = DSPI_DMA_BUFSIZE / DSPI_FIFO_SIZE;
339 while (curr_remaining_bytes) {
340 /* Check if current transfer fits the DMA buffer */
341 dma->curr_xfer_len = curr_remaining_bytes / word;
342 if (dma->curr_xfer_len > bytes_per_buffer)
343 dma->curr_xfer_len = bytes_per_buffer;
344
345 ret = dspi_next_xfer_dma_submit(dspi);
346 if (ret) {
347 dev_err(dev, "DMA transfer failed\n");
348 goto exit;
349
350 } else {
351 curr_remaining_bytes -= dma->curr_xfer_len * word;
352 if (curr_remaining_bytes < 0)
353 curr_remaining_bytes = 0;
354 }
355 }
356
357exit:
358 return ret;
359}
360
361static int dspi_request_dma(struct fsl_dspi *dspi, phys_addr_t phy_addr)
362{
363 struct fsl_dspi_dma *dma;
364 struct dma_slave_config cfg;
365 struct device *dev = &dspi->pdev->dev;
366 int ret;
367
368 dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
369 if (!dma)
370 return -ENOMEM;
371
372 dma->chan_rx = dma_request_slave_channel(dev, "rx");
373 if (!dma->chan_rx) {
374 dev_err(dev, "rx dma channel not available\n");
375 ret = -ENODEV;
376 return ret;
377 }
378
379 dma->chan_tx = dma_request_slave_channel(dev, "tx");
380 if (!dma->chan_tx) {
381 dev_err(dev, "tx dma channel not available\n");
382 ret = -ENODEV;
383 goto err_tx_channel;
384 }
385
386 dma->tx_dma_buf = dma_alloc_coherent(dev, DSPI_DMA_BUFSIZE,
387 &dma->tx_dma_phys, GFP_KERNEL);
388 if (!dma->tx_dma_buf) {
389 ret = -ENOMEM;
390 goto err_tx_dma_buf;
391 }
392
393 dma->rx_dma_buf = dma_alloc_coherent(dev, DSPI_DMA_BUFSIZE,
394 &dma->rx_dma_phys, GFP_KERNEL);
395 if (!dma->rx_dma_buf) {
396 ret = -ENOMEM;
397 goto err_rx_dma_buf;
398 }
399
400 cfg.src_addr = phy_addr + SPI_POPR;
401 cfg.dst_addr = phy_addr + SPI_PUSHR;
402 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
403 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
404 cfg.src_maxburst = 1;
405 cfg.dst_maxburst = 1;
406
407 cfg.direction = DMA_DEV_TO_MEM;
408 ret = dmaengine_slave_config(dma->chan_rx, &cfg);
409 if (ret) {
410 dev_err(dev, "can't configure rx dma channel\n");
411 ret = -EINVAL;
412 goto err_slave_config;
413 }
414
415 cfg.direction = DMA_MEM_TO_DEV;
416 ret = dmaengine_slave_config(dma->chan_tx, &cfg);
417 if (ret) {
418 dev_err(dev, "can't configure tx dma channel\n");
419 ret = -EINVAL;
420 goto err_slave_config;
421 }
422
423 dspi->dma = dma;
424 init_completion(&dma->cmd_tx_complete);
425 init_completion(&dma->cmd_rx_complete);
426
427 return 0;
428
429err_slave_config:
430 dma_free_coherent(dev, DSPI_DMA_BUFSIZE,
431 dma->rx_dma_buf, dma->rx_dma_phys);
432err_rx_dma_buf:
433 dma_free_coherent(dev, DSPI_DMA_BUFSIZE,
434 dma->tx_dma_buf, dma->tx_dma_phys);
435err_tx_dma_buf:
436 dma_release_channel(dma->chan_tx);
437err_tx_channel:
438 dma_release_channel(dma->chan_rx);
439
440 devm_kfree(dev, dma);
441 dspi->dma = NULL;
442
443 return ret;
444}
445
446static void dspi_release_dma(struct fsl_dspi *dspi)
447{
448 struct fsl_dspi_dma *dma = dspi->dma;
449 struct device *dev = &dspi->pdev->dev;
450
451 if (dma) {
452 if (dma->chan_tx) {
453 dma_unmap_single(dev, dma->tx_dma_phys,
454 DSPI_DMA_BUFSIZE, DMA_TO_DEVICE);
455 dma_release_channel(dma->chan_tx);
456 }
457
458 if (dma->chan_rx) {
459 dma_unmap_single(dev, dma->rx_dma_phys,
460 DSPI_DMA_BUFSIZE, DMA_FROM_DEVICE);
461 dma_release_channel(dma->chan_rx);
462 }
463 }
464}
465
466static void hz_to_spi_baud(char *pbr, char *br, int speed_hz,
467 unsigned long clkrate)
468{
469 /* Valid baud rate pre-scaler values */
470 int pbr_tbl[4] = {2, 3, 5, 7};
471 int brs[16] = { 2, 4, 6, 8,
472 16, 32, 64, 128,
473 256, 512, 1024, 2048,
474 4096, 8192, 16384, 32768 };
475 int scale_needed, scale, minscale = INT_MAX;
476 int i, j;
477
478 scale_needed = clkrate / speed_hz;
479 if (clkrate % speed_hz)
480 scale_needed++;
481
482 for (i = 0; i < ARRAY_SIZE(brs); i++)
483 for (j = 0; j < ARRAY_SIZE(pbr_tbl); j++) {
484 scale = brs[i] * pbr_tbl[j];
485 if (scale >= scale_needed) {
486 if (scale < minscale) {
487 minscale = scale;
488 *br = i;
489 *pbr = j;
490 }
491 break;
492 }
493 }
494
495 if (minscale == INT_MAX) {
496 pr_warn("Can not find valid baud rate,speed_hz is %d,clkrate is %ld, we use the max prescaler value.\n",
497 speed_hz, clkrate);
498 *pbr = ARRAY_SIZE(pbr_tbl) - 1;
499 *br = ARRAY_SIZE(brs) - 1;
500 }
501}
502
503static void ns_delay_scale(char *psc, char *sc, int delay_ns,
504 unsigned long clkrate)
505{
506 int pscale_tbl[4] = {1, 3, 5, 7};
507 int scale_needed, scale, minscale = INT_MAX;
508 int i, j;
509 u32 remainder;
510
511 scale_needed = div_u64_rem((u64)delay_ns * clkrate, NSEC_PER_SEC,
512 &remainder);
513 if (remainder)
514 scale_needed++;
515
516 for (i = 0; i < ARRAY_SIZE(pscale_tbl); i++)
517 for (j = 0; j <= SPI_CTAR_SCALE_BITS; j++) {
518 scale = pscale_tbl[i] * (2 << j);
519 if (scale >= scale_needed) {
520 if (scale < minscale) {
521 minscale = scale;
522 *psc = i;
523 *sc = j;
524 }
525 break;
526 }
527 }
528
529 if (minscale == INT_MAX) {
530 pr_warn("Cannot find correct scale values for %dns delay at clkrate %ld, using max prescaler value",
531 delay_ns, clkrate);
532 *psc = ARRAY_SIZE(pscale_tbl) - 1;
533 *sc = SPI_CTAR_SCALE_BITS;
534 }
535}
536
537static u32 dspi_data_to_pushr(struct fsl_dspi *dspi, int tx_word)
538{
539 u16 d16;
540
541 if (!(dspi->dataflags & TRAN_STATE_TX_VOID))
542 d16 = tx_word ? *(u16 *)dspi->tx : *(u8 *)dspi->tx;
543 else
544 d16 = dspi->void_write_data;
545
546 dspi->tx += tx_word + 1;
547 dspi->len -= tx_word + 1;
548
549 return SPI_PUSHR_TXDATA(d16) |
550 SPI_PUSHR_PCS(dspi->cs) |
551 SPI_PUSHR_CTAS(0) |
552 SPI_PUSHR_CONT;
553}
554
555static void dspi_data_from_popr(struct fsl_dspi *dspi, int rx_word)
556{
557 u16 d;
558 unsigned int val;
559
560 regmap_read(dspi->regmap, SPI_POPR, &val);
561 d = SPI_POPR_RXDATA(val);
562
563 if (!(dspi->dataflags & TRAN_STATE_RX_VOID))
564 rx_word ? (*(u16 *)dspi->rx = d) : (*(u8 *)dspi->rx = d);
565
566 dspi->rx += rx_word + 1;
567}
568
569static int dspi_eoq_write(struct fsl_dspi *dspi)
570{
571 int tx_count = 0;
572 int tx_word;
573 u32 dspi_pushr = 0;
574
575 tx_word = is_double_byte_mode(dspi);
576
577 while (dspi->len && (tx_count < DSPI_FIFO_SIZE)) {
578 /* If we are in word mode, only have a single byte to transfer
579 * switch to byte mode temporarily. Will switch back at the
580 * end of the transfer.
581 */
582 if (tx_word && (dspi->len == 1)) {
583 dspi->dataflags |= TRAN_STATE_WORD_ODD_NUM;
584 regmap_update_bits(dspi->regmap, SPI_CTAR(0),
585 SPI_FRAME_BITS_MASK, SPI_FRAME_BITS(8));
586 tx_word = 0;
587 }
588
589 dspi_pushr = dspi_data_to_pushr(dspi, tx_word);
590
591 if (dspi->len == 0 || tx_count == DSPI_FIFO_SIZE - 1) {
592 /* last transfer in the transfer */
593 dspi_pushr |= SPI_PUSHR_EOQ;
594 if ((dspi->cs_change) && (!dspi->len))
595 dspi_pushr &= ~SPI_PUSHR_CONT;
596 } else if (tx_word && (dspi->len == 1))
597 dspi_pushr |= SPI_PUSHR_EOQ;
598
599 regmap_write(dspi->regmap, SPI_PUSHR, dspi_pushr);
600
601 tx_count++;
602 }
603
604 return tx_count * (tx_word + 1);
605}
606
607static int dspi_eoq_read(struct fsl_dspi *dspi)
608{
609 int rx_count = 0;
610 int rx_word = is_double_byte_mode(dspi);
611
612 while ((dspi->rx < dspi->rx_end)
613 && (rx_count < DSPI_FIFO_SIZE)) {
614 if (rx_word && (dspi->rx_end - dspi->rx) == 1)
615 rx_word = 0;
616
617 dspi_data_from_popr(dspi, rx_word);
618 rx_count++;
619 }
620
621 return rx_count;
622}
623
624static int dspi_tcfq_write(struct fsl_dspi *dspi)
625{
626 int tx_word;
627 u32 dspi_pushr = 0;
628
629 tx_word = is_double_byte_mode(dspi);
630
631 if (tx_word && (dspi->len == 1)) {
632 dspi->dataflags |= TRAN_STATE_WORD_ODD_NUM;
633 regmap_update_bits(dspi->regmap, SPI_CTAR(0),
634 SPI_FRAME_BITS_MASK, SPI_FRAME_BITS(8));
635 tx_word = 0;
636 }
637
638 dspi_pushr = dspi_data_to_pushr(dspi, tx_word);
639
640 if ((dspi->cs_change) && (!dspi->len))
641 dspi_pushr &= ~SPI_PUSHR_CONT;
642
643 regmap_write(dspi->regmap, SPI_PUSHR, dspi_pushr);
644
645 return tx_word + 1;
646}
647
648static void dspi_tcfq_read(struct fsl_dspi *dspi)
649{
650 int rx_word = is_double_byte_mode(dspi);
651
652 if (rx_word && (dspi->rx_end - dspi->rx) == 1)
653 rx_word = 0;
654
655 dspi_data_from_popr(dspi, rx_word);
656}
657
658static int dspi_transfer_one_message(struct spi_master *master,
659 struct spi_message *message)
660{
661 struct fsl_dspi *dspi = spi_master_get_devdata(master);
662 struct spi_device *spi = message->spi;
663 struct spi_transfer *transfer;
664 int status = 0;
665 enum dspi_trans_mode trans_mode;
666 u32 spi_tcr;
667
668 regmap_read(dspi->regmap, SPI_TCR, &spi_tcr);
669 dspi->spi_tcnt = SPI_TCR_GET_TCNT(spi_tcr);
670
671 message->actual_length = 0;
672
673 list_for_each_entry(transfer, &message->transfers, transfer_list) {
674 dspi->cur_transfer = transfer;
675 dspi->cur_msg = message;
676 dspi->cur_chip = spi_get_ctldata(spi);
677 dspi->cs = spi->chip_select;
678 dspi->cs_change = 0;
679 if (list_is_last(&dspi->cur_transfer->transfer_list,
680 &dspi->cur_msg->transfers) || transfer->cs_change)
681 dspi->cs_change = 1;
682 dspi->void_write_data = dspi->cur_chip->void_write_data;
683
684 dspi->dataflags = 0;
685 dspi->tx = (void *)transfer->tx_buf;
686 dspi->tx_end = dspi->tx + transfer->len;
687 dspi->rx = transfer->rx_buf;
688 dspi->rx_end = dspi->rx + transfer->len;
689 dspi->len = transfer->len;
690
691 if (!dspi->rx)
692 dspi->dataflags |= TRAN_STATE_RX_VOID;
693
694 if (!dspi->tx)
695 dspi->dataflags |= TRAN_STATE_TX_VOID;
696
697 regmap_write(dspi->regmap, SPI_MCR, dspi->cur_chip->mcr_val);
698 regmap_update_bits(dspi->regmap, SPI_MCR,
699 SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF,
700 SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF);
701 regmap_write(dspi->regmap, SPI_CTAR(0),
702 dspi->cur_chip->ctar_val);
703
704 trans_mode = dspi->devtype_data->trans_mode;
705 switch (trans_mode) {
706 case DSPI_EOQ_MODE:
707 regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_EOQFE);
708 dspi_eoq_write(dspi);
709 break;
710 case DSPI_TCFQ_MODE:
711 regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_TCFQE);
712 dspi_tcfq_write(dspi);
713 break;
714 case DSPI_DMA_MODE:
715 regmap_write(dspi->regmap, SPI_RSER,
716 SPI_RSER_TFFFE | SPI_RSER_TFFFD |
717 SPI_RSER_RFDFE | SPI_RSER_RFDFD);
718 status = dspi_dma_xfer(dspi);
719 break;
720 default:
721 dev_err(&dspi->pdev->dev, "unsupported trans_mode %u\n",
722 trans_mode);
723 status = -EINVAL;
724 goto out;
725 }
726
727 if (trans_mode != DSPI_DMA_MODE) {
728 if (wait_event_interruptible(dspi->waitq,
729 dspi->waitflags))
730 dev_err(&dspi->pdev->dev,
731 "wait transfer complete fail!\n");
732 dspi->waitflags = 0;
733 }
734
735 if (transfer->delay_usecs)
736 udelay(transfer->delay_usecs);
737 }
738
739out:
740 message->status = status;
741 spi_finalize_current_message(master);
742
743 return status;
744}
745
746static int dspi_setup(struct spi_device *spi)
747{
748 struct chip_data *chip;
749 struct fsl_dspi *dspi = spi_master_get_devdata(spi->master);
750 struct fsl_dspi_platform_data *pdata;
751 u32 cs_sck_delay = 0, sck_cs_delay = 0;
752 unsigned char br = 0, pbr = 0, pcssck = 0, cssck = 0;
753 unsigned char pasc = 0, asc = 0, fmsz = 0;
754 unsigned long clkrate;
755
756 if ((spi->bits_per_word >= 4) && (spi->bits_per_word <= 16)) {
757 fmsz = spi->bits_per_word - 1;
758 } else {
759 pr_err("Invalid wordsize\n");
760 return -ENODEV;
761 }
762
763 /* Only alloc on first setup */
764 chip = spi_get_ctldata(spi);
765 if (chip == NULL) {
766 chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
767 if (!chip)
768 return -ENOMEM;
769 }
770
771 pdata = dev_get_platdata(&dspi->pdev->dev);
772
773 if (!pdata) {
774 of_property_read_u32(spi->dev.of_node, "fsl,spi-cs-sck-delay",
775 &cs_sck_delay);
776
777 of_property_read_u32(spi->dev.of_node, "fsl,spi-sck-cs-delay",
778 &sck_cs_delay);
779 } else {
780 cs_sck_delay = pdata->cs_sck_delay;
781 sck_cs_delay = pdata->sck_cs_delay;
782 }
783
784 chip->mcr_val = SPI_MCR_MASTER | SPI_MCR_PCSIS |
785 SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF;
786
787 chip->void_write_data = 0;
788
789 clkrate = clk_get_rate(dspi->clk);
790 hz_to_spi_baud(&pbr, &br, spi->max_speed_hz, clkrate);
791
792 /* Set PCS to SCK delay scale values */
793 ns_delay_scale(&pcssck, &cssck, cs_sck_delay, clkrate);
794
795 /* Set After SCK delay scale values */
796 ns_delay_scale(&pasc, &asc, sck_cs_delay, clkrate);
797
798 chip->ctar_val = SPI_CTAR_FMSZ(fmsz)
799 | SPI_CTAR_CPOL(spi->mode & SPI_CPOL ? 1 : 0)
800 | SPI_CTAR_CPHA(spi->mode & SPI_CPHA ? 1 : 0)
801 | SPI_CTAR_LSBFE(spi->mode & SPI_LSB_FIRST ? 1 : 0)
802 | SPI_CTAR_PCSSCK(pcssck)
803 | SPI_CTAR_CSSCK(cssck)
804 | SPI_CTAR_PASC(pasc)
805 | SPI_CTAR_ASC(asc)
806 | SPI_CTAR_PBR(pbr)
807 | SPI_CTAR_BR(br);
808
809 spi_set_ctldata(spi, chip);
810
811 return 0;
812}
813
814static void dspi_cleanup(struct spi_device *spi)
815{
816 struct chip_data *chip = spi_get_ctldata((struct spi_device *)spi);
817
818 dev_dbg(&spi->dev, "spi_device %u.%u cleanup\n",
819 spi->master->bus_num, spi->chip_select);
820
821 kfree(chip);
822}
823
824static irqreturn_t dspi_interrupt(int irq, void *dev_id)
825{
826 struct fsl_dspi *dspi = (struct fsl_dspi *)dev_id;
827 struct spi_message *msg = dspi->cur_msg;
828 enum dspi_trans_mode trans_mode;
829 u32 spi_sr, spi_tcr;
830 u32 spi_tcnt, tcnt_diff;
831 int tx_word;
832
833 regmap_read(dspi->regmap, SPI_SR, &spi_sr);
834 regmap_write(dspi->regmap, SPI_SR, spi_sr);
835
836
837 if (spi_sr & (SPI_SR_EOQF | SPI_SR_TCFQF)) {
838 tx_word = is_double_byte_mode(dspi);
839
840 regmap_read(dspi->regmap, SPI_TCR, &spi_tcr);
841 spi_tcnt = SPI_TCR_GET_TCNT(spi_tcr);
842 /*
843 * The width of SPI Transfer Counter in SPI_TCR is 16bits,
844 * so the max couner is 65535. When the counter reach 65535,
845 * it will wrap around, counter reset to zero.
846 * spi_tcnt my be less than dspi->spi_tcnt, it means the
847 * counter already wrapped around.
848 * SPI Transfer Counter is a counter of transmitted frames.
849 * The size of frame maybe two bytes.
850 */
851 tcnt_diff = ((spi_tcnt + SPI_TCR_TCNT_MAX) - dspi->spi_tcnt)
852 % SPI_TCR_TCNT_MAX;
853 tcnt_diff *= (tx_word + 1);
854 if (dspi->dataflags & TRAN_STATE_WORD_ODD_NUM)
855 tcnt_diff--;
856
857 msg->actual_length += tcnt_diff;
858
859 dspi->spi_tcnt = spi_tcnt;
860
861 trans_mode = dspi->devtype_data->trans_mode;
862 switch (trans_mode) {
863 case DSPI_EOQ_MODE:
864 dspi_eoq_read(dspi);
865 break;
866 case DSPI_TCFQ_MODE:
867 dspi_tcfq_read(dspi);
868 break;
869 default:
870 dev_err(&dspi->pdev->dev, "unsupported trans_mode %u\n",
871 trans_mode);
872 return IRQ_HANDLED;
873 }
874
875 if (!dspi->len) {
876 if (dspi->dataflags & TRAN_STATE_WORD_ODD_NUM) {
877 regmap_update_bits(dspi->regmap,
878 SPI_CTAR(0),
879 SPI_FRAME_BITS_MASK,
880 SPI_FRAME_BITS(16));
881 dspi->dataflags &= ~TRAN_STATE_WORD_ODD_NUM;
882 }
883
884 dspi->waitflags = 1;
885 wake_up_interruptible(&dspi->waitq);
886 } else {
887 switch (trans_mode) {
888 case DSPI_EOQ_MODE:
889 dspi_eoq_write(dspi);
890 break;
891 case DSPI_TCFQ_MODE:
892 dspi_tcfq_write(dspi);
893 break;
894 default:
895 dev_err(&dspi->pdev->dev,
896 "unsupported trans_mode %u\n",
897 trans_mode);
898 }
899 }
900 }
901
902 return IRQ_HANDLED;
903}
904
905static const struct of_device_id fsl_dspi_dt_ids[] = {
906 { .compatible = "fsl,vf610-dspi", .data = &vf610_data, },
907 { .compatible = "fsl,ls1021a-v1.0-dspi", .data = &ls1021a_v1_data, },
908 { .compatible = "fsl,ls2085a-dspi", .data = &ls2085a_data, },
909 { /* sentinel */ }
910};
911MODULE_DEVICE_TABLE(of, fsl_dspi_dt_ids);
912
913#ifdef CONFIG_PM_SLEEP
914static int dspi_suspend(struct device *dev)
915{
916 struct spi_master *master = dev_get_drvdata(dev);
917 struct fsl_dspi *dspi = spi_master_get_devdata(master);
918
919 spi_master_suspend(master);
920 clk_disable_unprepare(dspi->clk);
921
922 pinctrl_pm_select_sleep_state(dev);
923
924 return 0;
925}
926
927static int dspi_resume(struct device *dev)
928{
929 struct spi_master *master = dev_get_drvdata(dev);
930 struct fsl_dspi *dspi = spi_master_get_devdata(master);
931 int ret;
932
933 pinctrl_pm_select_default_state(dev);
934
935 ret = clk_prepare_enable(dspi->clk);
936 if (ret)
937 return ret;
938 spi_master_resume(master);
939
940 return 0;
941}
942#endif /* CONFIG_PM_SLEEP */
943
944static SIMPLE_DEV_PM_OPS(dspi_pm, dspi_suspend, dspi_resume);
945
946static const struct regmap_config dspi_regmap_config = {
947 .reg_bits = 32,
948 .val_bits = 32,
949 .reg_stride = 4,
950 .max_register = 0x88,
951};
952
953static void dspi_init(struct fsl_dspi *dspi)
954{
955 regmap_write(dspi->regmap, SPI_SR, SPI_SR_CLEAR);
956}
957
958static int dspi_probe(struct platform_device *pdev)
959{
960 struct device_node *np = pdev->dev.of_node;
961 struct spi_master *master;
962 struct fsl_dspi *dspi;
963 struct resource *res;
964 void __iomem *base;
965 struct fsl_dspi_platform_data *pdata;
966 int ret = 0, cs_num, bus_num;
967
968 master = spi_alloc_master(&pdev->dev, sizeof(struct fsl_dspi));
969 if (!master)
970 return -ENOMEM;
971
972 dspi = spi_master_get_devdata(master);
973 dspi->pdev = pdev;
974 dspi->master = master;
975
976 master->transfer = NULL;
977 master->setup = dspi_setup;
978 master->transfer_one_message = dspi_transfer_one_message;
979 master->dev.of_node = pdev->dev.of_node;
980
981 master->cleanup = dspi_cleanup;
982 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;
983 master->bits_per_word_mask = SPI_BPW_MASK(4) | SPI_BPW_MASK(8) |
984 SPI_BPW_MASK(16);
985
986 pdata = dev_get_platdata(&pdev->dev);
987 if (pdata) {
988 master->num_chipselect = pdata->cs_num;
989 master->bus_num = pdata->bus_num;
990
991 dspi->devtype_data = &coldfire_data;
992 } else {
993
994 ret = of_property_read_u32(np, "spi-num-chipselects", &cs_num);
995 if (ret < 0) {
996 dev_err(&pdev->dev, "can't get spi-num-chipselects\n");
997 goto out_master_put;
998 }
999 master->num_chipselect = cs_num;
1000
1001 ret = of_property_read_u32(np, "bus-num", &bus_num);
1002 if (ret < 0) {
1003 dev_err(&pdev->dev, "can't get bus-num\n");
1004 goto out_master_put;
1005 }
1006 master->bus_num = bus_num;
1007
1008 dspi->devtype_data = of_device_get_match_data(&pdev->dev);
1009 if (!dspi->devtype_data) {
1010 dev_err(&pdev->dev, "can't get devtype_data\n");
1011 ret = -EFAULT;
1012 goto out_master_put;
1013 }
1014 }
1015
1016 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1017 base = devm_ioremap_resource(&pdev->dev, res);
1018 if (IS_ERR(base)) {
1019 ret = PTR_ERR(base);
1020 goto out_master_put;
1021 }
1022
1023 dspi->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
1024 &dspi_regmap_config);
1025 if (IS_ERR(dspi->regmap)) {
1026 dev_err(&pdev->dev, "failed to init regmap: %ld\n",
1027 PTR_ERR(dspi->regmap));
1028 ret = PTR_ERR(dspi->regmap);
1029 goto out_master_put;
1030 }
1031
1032 dspi_init(dspi);
1033 dspi->irq = platform_get_irq(pdev, 0);
1034 if (dspi->irq < 0) {
1035 dev_err(&pdev->dev, "can't get platform irq\n");
1036 ret = dspi->irq;
1037 goto out_master_put;
1038 }
1039
1040 ret = devm_request_irq(&pdev->dev, dspi->irq, dspi_interrupt, 0,
1041 pdev->name, dspi);
1042 if (ret < 0) {
1043 dev_err(&pdev->dev, "Unable to attach DSPI interrupt\n");
1044 goto out_master_put;
1045 }
1046
1047 dspi->clk = devm_clk_get(&pdev->dev, "dspi");
1048 if (IS_ERR(dspi->clk)) {
1049 ret = PTR_ERR(dspi->clk);
1050 dev_err(&pdev->dev, "unable to get clock\n");
1051 goto out_master_put;
1052 }
1053 ret = clk_prepare_enable(dspi->clk);
1054 if (ret)
1055 goto out_master_put;
1056
1057 if (dspi->devtype_data->trans_mode == DSPI_DMA_MODE) {
1058 ret = dspi_request_dma(dspi, res->start);
1059 if (ret < 0) {
1060 dev_err(&pdev->dev, "can't get dma channels\n");
1061 goto out_clk_put;
1062 }
1063 }
1064
1065 master->max_speed_hz =
1066 clk_get_rate(dspi->clk) / dspi->devtype_data->max_clock_factor;
1067
1068 init_waitqueue_head(&dspi->waitq);
1069 platform_set_drvdata(pdev, master);
1070
1071 ret = spi_register_master(master);
1072 if (ret != 0) {
1073 dev_err(&pdev->dev, "Problem registering DSPI master\n");
1074 goto out_clk_put;
1075 }
1076
1077 return ret;
1078
1079out_clk_put:
1080 clk_disable_unprepare(dspi->clk);
1081out_master_put:
1082 spi_master_put(master);
1083
1084 return ret;
1085}
1086
1087static int dspi_remove(struct platform_device *pdev)
1088{
1089 struct spi_master *master = platform_get_drvdata(pdev);
1090 struct fsl_dspi *dspi = spi_master_get_devdata(master);
1091
1092 /* Disconnect from the SPI framework */
1093 dspi_release_dma(dspi);
1094 clk_disable_unprepare(dspi->clk);
1095 spi_unregister_master(dspi->master);
1096
1097 return 0;
1098}
1099
1100static struct platform_driver fsl_dspi_driver = {
1101 .driver.name = DRIVER_NAME,
1102 .driver.of_match_table = fsl_dspi_dt_ids,
1103 .driver.owner = THIS_MODULE,
1104 .driver.pm = &dspi_pm,
1105 .probe = dspi_probe,
1106 .remove = dspi_remove,
1107};
1108module_platform_driver(fsl_dspi_driver);
1109
1110MODULE_DESCRIPTION("Freescale DSPI Controller Driver");
1111MODULE_LICENSE("GPL");
1112MODULE_ALIAS("platform:" DRIVER_NAME);