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1// SPDX-License-Identifier: GPL-2.0+
2// Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
3// Copyright (C) 2008 Juergen Beisert
4
5#include <linux/clk.h>
6#include <linux/completion.h>
7#include <linux/delay.h>
8#include <linux/dmaengine.h>
9#include <linux/dma-mapping.h>
10#include <linux/err.h>
11#include <linux/interrupt.h>
12#include <linux/io.h>
13#include <linux/irq.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/pinctrl/consumer.h>
17#include <linux/platform_device.h>
18#include <linux/pm_runtime.h>
19#include <linux/slab.h>
20#include <linux/spi/spi.h>
21#include <linux/spi/spi_bitbang.h>
22#include <linux/types.h>
23#include <linux/of.h>
24#include <linux/of_device.h>
25#include <linux/property.h>
26
27#include <linux/platform_data/dma-imx.h>
28
29#define DRIVER_NAME "spi_imx"
30
31static bool use_dma = true;
32module_param(use_dma, bool, 0644);
33MODULE_PARM_DESC(use_dma, "Enable usage of DMA when available (default)");
34
35#define MXC_RPM_TIMEOUT 2000 /* 2000ms */
36
37#define MXC_CSPIRXDATA 0x00
38#define MXC_CSPITXDATA 0x04
39#define MXC_CSPICTRL 0x08
40#define MXC_CSPIINT 0x0c
41#define MXC_RESET 0x1c
42
43/* generic defines to abstract from the different register layouts */
44#define MXC_INT_RR (1 << 0) /* Receive data ready interrupt */
45#define MXC_INT_TE (1 << 1) /* Transmit FIFO empty interrupt */
46#define MXC_INT_RDR BIT(4) /* Receive date threshold interrupt */
47
48/* The maximum bytes that a sdma BD can transfer. */
49#define MAX_SDMA_BD_BYTES (1 << 15)
50#define MX51_ECSPI_CTRL_MAX_BURST 512
51/* The maximum bytes that IMX53_ECSPI can transfer in slave mode.*/
52#define MX53_MAX_TRANSFER_BYTES 512
53
54enum spi_imx_devtype {
55 IMX1_CSPI,
56 IMX21_CSPI,
57 IMX27_CSPI,
58 IMX31_CSPI,
59 IMX35_CSPI, /* CSPI on all i.mx except above */
60 IMX51_ECSPI, /* ECSPI on i.mx51 */
61 IMX53_ECSPI, /* ECSPI on i.mx53 and later */
62};
63
64struct spi_imx_data;
65
66struct spi_imx_devtype_data {
67 void (*intctrl)(struct spi_imx_data *, int);
68 int (*prepare_message)(struct spi_imx_data *, struct spi_message *);
69 int (*prepare_transfer)(struct spi_imx_data *, struct spi_device *,
70 struct spi_transfer *);
71 void (*trigger)(struct spi_imx_data *);
72 int (*rx_available)(struct spi_imx_data *);
73 void (*reset)(struct spi_imx_data *);
74 void (*setup_wml)(struct spi_imx_data *);
75 void (*disable)(struct spi_imx_data *);
76 void (*disable_dma)(struct spi_imx_data *);
77 bool has_dmamode;
78 bool has_slavemode;
79 unsigned int fifo_size;
80 bool dynamic_burst;
81 enum spi_imx_devtype devtype;
82};
83
84struct spi_imx_data {
85 struct spi_bitbang bitbang;
86 struct device *dev;
87
88 struct completion xfer_done;
89 void __iomem *base;
90 unsigned long base_phys;
91
92 struct clk *clk_per;
93 struct clk *clk_ipg;
94 unsigned long spi_clk;
95 unsigned int spi_bus_clk;
96
97 unsigned int bits_per_word;
98 unsigned int spi_drctl;
99
100 unsigned int count, remainder;
101 void (*tx)(struct spi_imx_data *);
102 void (*rx)(struct spi_imx_data *);
103 void *rx_buf;
104 const void *tx_buf;
105 unsigned int txfifo; /* number of words pushed in tx FIFO */
106 unsigned int dynamic_burst;
107
108 /* Slave mode */
109 bool slave_mode;
110 bool slave_aborted;
111 unsigned int slave_burst;
112
113 /* DMA */
114 bool usedma;
115 u32 wml;
116 struct completion dma_rx_completion;
117 struct completion dma_tx_completion;
118
119 const struct spi_imx_devtype_data *devtype_data;
120};
121
122static inline int is_imx27_cspi(struct spi_imx_data *d)
123{
124 return d->devtype_data->devtype == IMX27_CSPI;
125}
126
127static inline int is_imx35_cspi(struct spi_imx_data *d)
128{
129 return d->devtype_data->devtype == IMX35_CSPI;
130}
131
132static inline int is_imx51_ecspi(struct spi_imx_data *d)
133{
134 return d->devtype_data->devtype == IMX51_ECSPI;
135}
136
137static inline int is_imx53_ecspi(struct spi_imx_data *d)
138{
139 return d->devtype_data->devtype == IMX53_ECSPI;
140}
141
142#define MXC_SPI_BUF_RX(type) \
143static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx) \
144{ \
145 unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); \
146 \
147 if (spi_imx->rx_buf) { \
148 *(type *)spi_imx->rx_buf = val; \
149 spi_imx->rx_buf += sizeof(type); \
150 } \
151 \
152 spi_imx->remainder -= sizeof(type); \
153}
154
155#define MXC_SPI_BUF_TX(type) \
156static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx) \
157{ \
158 type val = 0; \
159 \
160 if (spi_imx->tx_buf) { \
161 val = *(type *)spi_imx->tx_buf; \
162 spi_imx->tx_buf += sizeof(type); \
163 } \
164 \
165 spi_imx->count -= sizeof(type); \
166 \
167 writel(val, spi_imx->base + MXC_CSPITXDATA); \
168}
169
170MXC_SPI_BUF_RX(u8)
171MXC_SPI_BUF_TX(u8)
172MXC_SPI_BUF_RX(u16)
173MXC_SPI_BUF_TX(u16)
174MXC_SPI_BUF_RX(u32)
175MXC_SPI_BUF_TX(u32)
176
177/* First entry is reserved, second entry is valid only if SDHC_SPIEN is set
178 * (which is currently not the case in this driver)
179 */
180static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192,
181 256, 384, 512, 768, 1024};
182
183/* MX21, MX27 */
184static unsigned int spi_imx_clkdiv_1(unsigned int fin,
185 unsigned int fspi, unsigned int max, unsigned int *fres)
186{
187 int i;
188
189 for (i = 2; i < max; i++)
190 if (fspi * mxc_clkdivs[i] >= fin)
191 break;
192
193 *fres = fin / mxc_clkdivs[i];
194 return i;
195}
196
197/* MX1, MX31, MX35, MX51 CSPI */
198static unsigned int spi_imx_clkdiv_2(unsigned int fin,
199 unsigned int fspi, unsigned int *fres)
200{
201 int i, div = 4;
202
203 for (i = 0; i < 7; i++) {
204 if (fspi * div >= fin)
205 goto out;
206 div <<= 1;
207 }
208
209out:
210 *fres = fin / div;
211 return i;
212}
213
214static int spi_imx_bytes_per_word(const int bits_per_word)
215{
216 if (bits_per_word <= 8)
217 return 1;
218 else if (bits_per_word <= 16)
219 return 2;
220 else
221 return 4;
222}
223
224static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
225 struct spi_transfer *transfer)
226{
227 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
228
229 if (!use_dma || master->fallback)
230 return false;
231
232 if (!master->dma_rx)
233 return false;
234
235 if (spi_imx->slave_mode)
236 return false;
237
238 if (transfer->len < spi_imx->devtype_data->fifo_size)
239 return false;
240
241 spi_imx->dynamic_burst = 0;
242
243 return true;
244}
245
246#define MX51_ECSPI_CTRL 0x08
247#define MX51_ECSPI_CTRL_ENABLE (1 << 0)
248#define MX51_ECSPI_CTRL_XCH (1 << 2)
249#define MX51_ECSPI_CTRL_SMC (1 << 3)
250#define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4)
251#define MX51_ECSPI_CTRL_DRCTL(drctl) ((drctl) << 16)
252#define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8
253#define MX51_ECSPI_CTRL_PREDIV_OFFSET 12
254#define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18)
255#define MX51_ECSPI_CTRL_BL_OFFSET 20
256#define MX51_ECSPI_CTRL_BL_MASK (0xfff << 20)
257
258#define MX51_ECSPI_CONFIG 0x0c
259#define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0))
260#define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs) + 4))
261#define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs) + 8))
262#define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs) + 12))
263#define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs) + 20))
264
265#define MX51_ECSPI_INT 0x10
266#define MX51_ECSPI_INT_TEEN (1 << 0)
267#define MX51_ECSPI_INT_RREN (1 << 3)
268#define MX51_ECSPI_INT_RDREN (1 << 4)
269
270#define MX51_ECSPI_DMA 0x14
271#define MX51_ECSPI_DMA_TX_WML(wml) ((wml) & 0x3f)
272#define MX51_ECSPI_DMA_RX_WML(wml) (((wml) & 0x3f) << 16)
273#define MX51_ECSPI_DMA_RXT_WML(wml) (((wml) & 0x3f) << 24)
274
275#define MX51_ECSPI_DMA_TEDEN (1 << 7)
276#define MX51_ECSPI_DMA_RXDEN (1 << 23)
277#define MX51_ECSPI_DMA_RXTDEN (1 << 31)
278
279#define MX51_ECSPI_STAT 0x18
280#define MX51_ECSPI_STAT_RR (1 << 3)
281
282#define MX51_ECSPI_TESTREG 0x20
283#define MX51_ECSPI_TESTREG_LBC BIT(31)
284
285static void spi_imx_buf_rx_swap_u32(struct spi_imx_data *spi_imx)
286{
287 unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA);
288#ifdef __LITTLE_ENDIAN
289 unsigned int bytes_per_word;
290#endif
291
292 if (spi_imx->rx_buf) {
293#ifdef __LITTLE_ENDIAN
294 bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
295 if (bytes_per_word == 1)
296 val = cpu_to_be32(val);
297 else if (bytes_per_word == 2)
298 val = (val << 16) | (val >> 16);
299#endif
300 *(u32 *)spi_imx->rx_buf = val;
301 spi_imx->rx_buf += sizeof(u32);
302 }
303
304 spi_imx->remainder -= sizeof(u32);
305}
306
307static void spi_imx_buf_rx_swap(struct spi_imx_data *spi_imx)
308{
309 int unaligned;
310 u32 val;
311
312 unaligned = spi_imx->remainder % 4;
313
314 if (!unaligned) {
315 spi_imx_buf_rx_swap_u32(spi_imx);
316 return;
317 }
318
319 if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) {
320 spi_imx_buf_rx_u16(spi_imx);
321 return;
322 }
323
324 val = readl(spi_imx->base + MXC_CSPIRXDATA);
325
326 while (unaligned--) {
327 if (spi_imx->rx_buf) {
328 *(u8 *)spi_imx->rx_buf = (val >> (8 * unaligned)) & 0xff;
329 spi_imx->rx_buf++;
330 }
331 spi_imx->remainder--;
332 }
333}
334
335static void spi_imx_buf_tx_swap_u32(struct spi_imx_data *spi_imx)
336{
337 u32 val = 0;
338#ifdef __LITTLE_ENDIAN
339 unsigned int bytes_per_word;
340#endif
341
342 if (spi_imx->tx_buf) {
343 val = *(u32 *)spi_imx->tx_buf;
344 spi_imx->tx_buf += sizeof(u32);
345 }
346
347 spi_imx->count -= sizeof(u32);
348#ifdef __LITTLE_ENDIAN
349 bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
350
351 if (bytes_per_word == 1)
352 val = cpu_to_be32(val);
353 else if (bytes_per_word == 2)
354 val = (val << 16) | (val >> 16);
355#endif
356 writel(val, spi_imx->base + MXC_CSPITXDATA);
357}
358
359static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx)
360{
361 int unaligned;
362 u32 val = 0;
363
364 unaligned = spi_imx->count % 4;
365
366 if (!unaligned) {
367 spi_imx_buf_tx_swap_u32(spi_imx);
368 return;
369 }
370
371 if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) {
372 spi_imx_buf_tx_u16(spi_imx);
373 return;
374 }
375
376 while (unaligned--) {
377 if (spi_imx->tx_buf) {
378 val |= *(u8 *)spi_imx->tx_buf << (8 * unaligned);
379 spi_imx->tx_buf++;
380 }
381 spi_imx->count--;
382 }
383
384 writel(val, spi_imx->base + MXC_CSPITXDATA);
385}
386
387static void mx53_ecspi_rx_slave(struct spi_imx_data *spi_imx)
388{
389 u32 val = be32_to_cpu(readl(spi_imx->base + MXC_CSPIRXDATA));
390
391 if (spi_imx->rx_buf) {
392 int n_bytes = spi_imx->slave_burst % sizeof(val);
393
394 if (!n_bytes)
395 n_bytes = sizeof(val);
396
397 memcpy(spi_imx->rx_buf,
398 ((u8 *)&val) + sizeof(val) - n_bytes, n_bytes);
399
400 spi_imx->rx_buf += n_bytes;
401 spi_imx->slave_burst -= n_bytes;
402 }
403
404 spi_imx->remainder -= sizeof(u32);
405}
406
407static void mx53_ecspi_tx_slave(struct spi_imx_data *spi_imx)
408{
409 u32 val = 0;
410 int n_bytes = spi_imx->count % sizeof(val);
411
412 if (!n_bytes)
413 n_bytes = sizeof(val);
414
415 if (spi_imx->tx_buf) {
416 memcpy(((u8 *)&val) + sizeof(val) - n_bytes,
417 spi_imx->tx_buf, n_bytes);
418 val = cpu_to_be32(val);
419 spi_imx->tx_buf += n_bytes;
420 }
421
422 spi_imx->count -= n_bytes;
423
424 writel(val, spi_imx->base + MXC_CSPITXDATA);
425}
426
427/* MX51 eCSPI */
428static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx,
429 unsigned int fspi, unsigned int *fres)
430{
431 /*
432 * there are two 4-bit dividers, the pre-divider divides by
433 * $pre, the post-divider by 2^$post
434 */
435 unsigned int pre, post;
436 unsigned int fin = spi_imx->spi_clk;
437
438 if (unlikely(fspi > fin))
439 return 0;
440
441 post = fls(fin) - fls(fspi);
442 if (fin > fspi << post)
443 post++;
444
445 /* now we have: (fin <= fspi << post) with post being minimal */
446
447 post = max(4U, post) - 4;
448 if (unlikely(post > 0xf)) {
449 dev_err(spi_imx->dev, "cannot set clock freq: %u (base freq: %u)\n",
450 fspi, fin);
451 return 0xff;
452 }
453
454 pre = DIV_ROUND_UP(fin, fspi << post) - 1;
455
456 dev_dbg(spi_imx->dev, "%s: fin: %u, fspi: %u, post: %u, pre: %u\n",
457 __func__, fin, fspi, post, pre);
458
459 /* Resulting frequency for the SCLK line. */
460 *fres = (fin / (pre + 1)) >> post;
461
462 return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) |
463 (post << MX51_ECSPI_CTRL_POSTDIV_OFFSET);
464}
465
466static void mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
467{
468 unsigned val = 0;
469
470 if (enable & MXC_INT_TE)
471 val |= MX51_ECSPI_INT_TEEN;
472
473 if (enable & MXC_INT_RR)
474 val |= MX51_ECSPI_INT_RREN;
475
476 if (enable & MXC_INT_RDR)
477 val |= MX51_ECSPI_INT_RDREN;
478
479 writel(val, spi_imx->base + MX51_ECSPI_INT);
480}
481
482static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
483{
484 u32 reg;
485
486 reg = readl(spi_imx->base + MX51_ECSPI_CTRL);
487 reg |= MX51_ECSPI_CTRL_XCH;
488 writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
489}
490
491static void mx51_disable_dma(struct spi_imx_data *spi_imx)
492{
493 writel(0, spi_imx->base + MX51_ECSPI_DMA);
494}
495
496static void mx51_ecspi_disable(struct spi_imx_data *spi_imx)
497{
498 u32 ctrl;
499
500 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
501 ctrl &= ~MX51_ECSPI_CTRL_ENABLE;
502 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
503}
504
505static int mx51_ecspi_prepare_message(struct spi_imx_data *spi_imx,
506 struct spi_message *msg)
507{
508 struct spi_device *spi = msg->spi;
509 u32 ctrl = MX51_ECSPI_CTRL_ENABLE;
510 u32 testreg;
511 u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
512
513 /* set Master or Slave mode */
514 if (spi_imx->slave_mode)
515 ctrl &= ~MX51_ECSPI_CTRL_MODE_MASK;
516 else
517 ctrl |= MX51_ECSPI_CTRL_MODE_MASK;
518
519 /*
520 * Enable SPI_RDY handling (falling edge/level triggered).
521 */
522 if (spi->mode & SPI_READY)
523 ctrl |= MX51_ECSPI_CTRL_DRCTL(spi_imx->spi_drctl);
524
525 /* set chip select to use */
526 ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select);
527
528 /*
529 * The ctrl register must be written first, with the EN bit set other
530 * registers must not be written to.
531 */
532 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
533
534 testreg = readl(spi_imx->base + MX51_ECSPI_TESTREG);
535 if (spi->mode & SPI_LOOP)
536 testreg |= MX51_ECSPI_TESTREG_LBC;
537 else
538 testreg &= ~MX51_ECSPI_TESTREG_LBC;
539 writel(testreg, spi_imx->base + MX51_ECSPI_TESTREG);
540
541 /*
542 * eCSPI burst completion by Chip Select signal in Slave mode
543 * is not functional for imx53 Soc, config SPI burst completed when
544 * BURST_LENGTH + 1 bits are received
545 */
546 if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx))
547 cfg &= ~MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select);
548 else
549 cfg |= MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select);
550
551 if (spi->mode & SPI_CPHA)
552 cfg |= MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
553 else
554 cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
555
556 if (spi->mode & SPI_CPOL) {
557 cfg |= MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select);
558 cfg |= MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select);
559 } else {
560 cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select);
561 cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select);
562 }
563
564 if (spi->mode & SPI_CS_HIGH)
565 cfg |= MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select);
566 else
567 cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select);
568
569 writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
570
571 return 0;
572}
573
574static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
575 struct spi_device *spi,
576 struct spi_transfer *t)
577{
578 u32 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
579 u32 clk = t->speed_hz, delay;
580
581 /* Clear BL field and set the right value */
582 ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
583 if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx))
584 ctrl |= (spi_imx->slave_burst * 8 - 1)
585 << MX51_ECSPI_CTRL_BL_OFFSET;
586 else
587 ctrl |= (spi_imx->bits_per_word - 1)
588 << MX51_ECSPI_CTRL_BL_OFFSET;
589
590 /* set clock speed */
591 ctrl &= ~(0xf << MX51_ECSPI_CTRL_POSTDIV_OFFSET |
592 0xf << MX51_ECSPI_CTRL_PREDIV_OFFSET);
593 ctrl |= mx51_ecspi_clkdiv(spi_imx, t->speed_hz, &clk);
594 spi_imx->spi_bus_clk = clk;
595
596 if (spi_imx->usedma)
597 ctrl |= MX51_ECSPI_CTRL_SMC;
598
599 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
600
601 /*
602 * Wait until the changes in the configuration register CONFIGREG
603 * propagate into the hardware. It takes exactly one tick of the
604 * SCLK clock, but we will wait two SCLK clock just to be sure. The
605 * effect of the delay it takes for the hardware to apply changes
606 * is noticable if the SCLK clock run very slow. In such a case, if
607 * the polarity of SCLK should be inverted, the GPIO ChipSelect might
608 * be asserted before the SCLK polarity changes, which would disrupt
609 * the SPI communication as the device on the other end would consider
610 * the change of SCLK polarity as a clock tick already.
611 */
612 delay = (2 * 1000000) / clk;
613 if (likely(delay < 10)) /* SCLK is faster than 100 kHz */
614 udelay(delay);
615 else /* SCLK is _very_ slow */
616 usleep_range(delay, delay + 10);
617
618 return 0;
619}
620
621static void mx51_setup_wml(struct spi_imx_data *spi_imx)
622{
623 /*
624 * Configure the DMA register: setup the watermark
625 * and enable DMA request.
626 */
627 writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml - 1) |
628 MX51_ECSPI_DMA_TX_WML(spi_imx->wml) |
629 MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) |
630 MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN |
631 MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);
632}
633
634static int mx51_ecspi_rx_available(struct spi_imx_data *spi_imx)
635{
636 return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR;
637}
638
639static void mx51_ecspi_reset(struct spi_imx_data *spi_imx)
640{
641 /* drain receive buffer */
642 while (mx51_ecspi_rx_available(spi_imx))
643 readl(spi_imx->base + MXC_CSPIRXDATA);
644}
645
646#define MX31_INTREG_TEEN (1 << 0)
647#define MX31_INTREG_RREN (1 << 3)
648
649#define MX31_CSPICTRL_ENABLE (1 << 0)
650#define MX31_CSPICTRL_MASTER (1 << 1)
651#define MX31_CSPICTRL_XCH (1 << 2)
652#define MX31_CSPICTRL_SMC (1 << 3)
653#define MX31_CSPICTRL_POL (1 << 4)
654#define MX31_CSPICTRL_PHA (1 << 5)
655#define MX31_CSPICTRL_SSCTL (1 << 6)
656#define MX31_CSPICTRL_SSPOL (1 << 7)
657#define MX31_CSPICTRL_BC_SHIFT 8
658#define MX35_CSPICTRL_BL_SHIFT 20
659#define MX31_CSPICTRL_CS_SHIFT 24
660#define MX35_CSPICTRL_CS_SHIFT 12
661#define MX31_CSPICTRL_DR_SHIFT 16
662
663#define MX31_CSPI_DMAREG 0x10
664#define MX31_DMAREG_RH_DEN (1<<4)
665#define MX31_DMAREG_TH_DEN (1<<1)
666
667#define MX31_CSPISTATUS 0x14
668#define MX31_STATUS_RR (1 << 3)
669
670#define MX31_CSPI_TESTREG 0x1C
671#define MX31_TEST_LBC (1 << 14)
672
673/* These functions also work for the i.MX35, but be aware that
674 * the i.MX35 has a slightly different register layout for bits
675 * we do not use here.
676 */
677static void mx31_intctrl(struct spi_imx_data *spi_imx, int enable)
678{
679 unsigned int val = 0;
680
681 if (enable & MXC_INT_TE)
682 val |= MX31_INTREG_TEEN;
683 if (enable & MXC_INT_RR)
684 val |= MX31_INTREG_RREN;
685
686 writel(val, spi_imx->base + MXC_CSPIINT);
687}
688
689static void mx31_trigger(struct spi_imx_data *spi_imx)
690{
691 unsigned int reg;
692
693 reg = readl(spi_imx->base + MXC_CSPICTRL);
694 reg |= MX31_CSPICTRL_XCH;
695 writel(reg, spi_imx->base + MXC_CSPICTRL);
696}
697
698static int mx31_prepare_message(struct spi_imx_data *spi_imx,
699 struct spi_message *msg)
700{
701 return 0;
702}
703
704static int mx31_prepare_transfer(struct spi_imx_data *spi_imx,
705 struct spi_device *spi,
706 struct spi_transfer *t)
707{
708 unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
709 unsigned int clk;
710
711 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, t->speed_hz, &clk) <<
712 MX31_CSPICTRL_DR_SHIFT;
713 spi_imx->spi_bus_clk = clk;
714
715 if (is_imx35_cspi(spi_imx)) {
716 reg |= (spi_imx->bits_per_word - 1) << MX35_CSPICTRL_BL_SHIFT;
717 reg |= MX31_CSPICTRL_SSCTL;
718 } else {
719 reg |= (spi_imx->bits_per_word - 1) << MX31_CSPICTRL_BC_SHIFT;
720 }
721
722 if (spi->mode & SPI_CPHA)
723 reg |= MX31_CSPICTRL_PHA;
724 if (spi->mode & SPI_CPOL)
725 reg |= MX31_CSPICTRL_POL;
726 if (spi->mode & SPI_CS_HIGH)
727 reg |= MX31_CSPICTRL_SSPOL;
728 if (!spi->cs_gpiod)
729 reg |= (spi->chip_select) <<
730 (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT :
731 MX31_CSPICTRL_CS_SHIFT);
732
733 if (spi_imx->usedma)
734 reg |= MX31_CSPICTRL_SMC;
735
736 writel(reg, spi_imx->base + MXC_CSPICTRL);
737
738 reg = readl(spi_imx->base + MX31_CSPI_TESTREG);
739 if (spi->mode & SPI_LOOP)
740 reg |= MX31_TEST_LBC;
741 else
742 reg &= ~MX31_TEST_LBC;
743 writel(reg, spi_imx->base + MX31_CSPI_TESTREG);
744
745 if (spi_imx->usedma) {
746 /*
747 * configure DMA requests when RXFIFO is half full and
748 * when TXFIFO is half empty
749 */
750 writel(MX31_DMAREG_RH_DEN | MX31_DMAREG_TH_DEN,
751 spi_imx->base + MX31_CSPI_DMAREG);
752 }
753
754 return 0;
755}
756
757static int mx31_rx_available(struct spi_imx_data *spi_imx)
758{
759 return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR;
760}
761
762static void mx31_reset(struct spi_imx_data *spi_imx)
763{
764 /* drain receive buffer */
765 while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR)
766 readl(spi_imx->base + MXC_CSPIRXDATA);
767}
768
769#define MX21_INTREG_RR (1 << 4)
770#define MX21_INTREG_TEEN (1 << 9)
771#define MX21_INTREG_RREN (1 << 13)
772
773#define MX21_CSPICTRL_POL (1 << 5)
774#define MX21_CSPICTRL_PHA (1 << 6)
775#define MX21_CSPICTRL_SSPOL (1 << 8)
776#define MX21_CSPICTRL_XCH (1 << 9)
777#define MX21_CSPICTRL_ENABLE (1 << 10)
778#define MX21_CSPICTRL_MASTER (1 << 11)
779#define MX21_CSPICTRL_DR_SHIFT 14
780#define MX21_CSPICTRL_CS_SHIFT 19
781
782static void mx21_intctrl(struct spi_imx_data *spi_imx, int enable)
783{
784 unsigned int val = 0;
785
786 if (enable & MXC_INT_TE)
787 val |= MX21_INTREG_TEEN;
788 if (enable & MXC_INT_RR)
789 val |= MX21_INTREG_RREN;
790
791 writel(val, spi_imx->base + MXC_CSPIINT);
792}
793
794static void mx21_trigger(struct spi_imx_data *spi_imx)
795{
796 unsigned int reg;
797
798 reg = readl(spi_imx->base + MXC_CSPICTRL);
799 reg |= MX21_CSPICTRL_XCH;
800 writel(reg, spi_imx->base + MXC_CSPICTRL);
801}
802
803static int mx21_prepare_message(struct spi_imx_data *spi_imx,
804 struct spi_message *msg)
805{
806 return 0;
807}
808
809static int mx21_prepare_transfer(struct spi_imx_data *spi_imx,
810 struct spi_device *spi,
811 struct spi_transfer *t)
812{
813 unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
814 unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
815 unsigned int clk;
816
817 reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, t->speed_hz, max, &clk)
818 << MX21_CSPICTRL_DR_SHIFT;
819 spi_imx->spi_bus_clk = clk;
820
821 reg |= spi_imx->bits_per_word - 1;
822
823 if (spi->mode & SPI_CPHA)
824 reg |= MX21_CSPICTRL_PHA;
825 if (spi->mode & SPI_CPOL)
826 reg |= MX21_CSPICTRL_POL;
827 if (spi->mode & SPI_CS_HIGH)
828 reg |= MX21_CSPICTRL_SSPOL;
829 if (!spi->cs_gpiod)
830 reg |= spi->chip_select << MX21_CSPICTRL_CS_SHIFT;
831
832 writel(reg, spi_imx->base + MXC_CSPICTRL);
833
834 return 0;
835}
836
837static int mx21_rx_available(struct spi_imx_data *spi_imx)
838{
839 return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR;
840}
841
842static void mx21_reset(struct spi_imx_data *spi_imx)
843{
844 writel(1, spi_imx->base + MXC_RESET);
845}
846
847#define MX1_INTREG_RR (1 << 3)
848#define MX1_INTREG_TEEN (1 << 8)
849#define MX1_INTREG_RREN (1 << 11)
850
851#define MX1_CSPICTRL_POL (1 << 4)
852#define MX1_CSPICTRL_PHA (1 << 5)
853#define MX1_CSPICTRL_XCH (1 << 8)
854#define MX1_CSPICTRL_ENABLE (1 << 9)
855#define MX1_CSPICTRL_MASTER (1 << 10)
856#define MX1_CSPICTRL_DR_SHIFT 13
857
858static void mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
859{
860 unsigned int val = 0;
861
862 if (enable & MXC_INT_TE)
863 val |= MX1_INTREG_TEEN;
864 if (enable & MXC_INT_RR)
865 val |= MX1_INTREG_RREN;
866
867 writel(val, spi_imx->base + MXC_CSPIINT);
868}
869
870static void mx1_trigger(struct spi_imx_data *spi_imx)
871{
872 unsigned int reg;
873
874 reg = readl(spi_imx->base + MXC_CSPICTRL);
875 reg |= MX1_CSPICTRL_XCH;
876 writel(reg, spi_imx->base + MXC_CSPICTRL);
877}
878
879static int mx1_prepare_message(struct spi_imx_data *spi_imx,
880 struct spi_message *msg)
881{
882 return 0;
883}
884
885static int mx1_prepare_transfer(struct spi_imx_data *spi_imx,
886 struct spi_device *spi,
887 struct spi_transfer *t)
888{
889 unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;
890 unsigned int clk;
891
892 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, t->speed_hz, &clk) <<
893 MX1_CSPICTRL_DR_SHIFT;
894 spi_imx->spi_bus_clk = clk;
895
896 reg |= spi_imx->bits_per_word - 1;
897
898 if (spi->mode & SPI_CPHA)
899 reg |= MX1_CSPICTRL_PHA;
900 if (spi->mode & SPI_CPOL)
901 reg |= MX1_CSPICTRL_POL;
902
903 writel(reg, spi_imx->base + MXC_CSPICTRL);
904
905 return 0;
906}
907
908static int mx1_rx_available(struct spi_imx_data *spi_imx)
909{
910 return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR;
911}
912
913static void mx1_reset(struct spi_imx_data *spi_imx)
914{
915 writel(1, spi_imx->base + MXC_RESET);
916}
917
918static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
919 .intctrl = mx1_intctrl,
920 .prepare_message = mx1_prepare_message,
921 .prepare_transfer = mx1_prepare_transfer,
922 .trigger = mx1_trigger,
923 .rx_available = mx1_rx_available,
924 .reset = mx1_reset,
925 .fifo_size = 8,
926 .has_dmamode = false,
927 .dynamic_burst = false,
928 .has_slavemode = false,
929 .devtype = IMX1_CSPI,
930};
931
932static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
933 .intctrl = mx21_intctrl,
934 .prepare_message = mx21_prepare_message,
935 .prepare_transfer = mx21_prepare_transfer,
936 .trigger = mx21_trigger,
937 .rx_available = mx21_rx_available,
938 .reset = mx21_reset,
939 .fifo_size = 8,
940 .has_dmamode = false,
941 .dynamic_burst = false,
942 .has_slavemode = false,
943 .devtype = IMX21_CSPI,
944};
945
946static struct spi_imx_devtype_data imx27_cspi_devtype_data = {
947 /* i.mx27 cspi shares the functions with i.mx21 one */
948 .intctrl = mx21_intctrl,
949 .prepare_message = mx21_prepare_message,
950 .prepare_transfer = mx21_prepare_transfer,
951 .trigger = mx21_trigger,
952 .rx_available = mx21_rx_available,
953 .reset = mx21_reset,
954 .fifo_size = 8,
955 .has_dmamode = false,
956 .dynamic_burst = false,
957 .has_slavemode = false,
958 .devtype = IMX27_CSPI,
959};
960
961static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
962 .intctrl = mx31_intctrl,
963 .prepare_message = mx31_prepare_message,
964 .prepare_transfer = mx31_prepare_transfer,
965 .trigger = mx31_trigger,
966 .rx_available = mx31_rx_available,
967 .reset = mx31_reset,
968 .fifo_size = 8,
969 .has_dmamode = false,
970 .dynamic_burst = false,
971 .has_slavemode = false,
972 .devtype = IMX31_CSPI,
973};
974
975static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
976 /* i.mx35 and later cspi shares the functions with i.mx31 one */
977 .intctrl = mx31_intctrl,
978 .prepare_message = mx31_prepare_message,
979 .prepare_transfer = mx31_prepare_transfer,
980 .trigger = mx31_trigger,
981 .rx_available = mx31_rx_available,
982 .reset = mx31_reset,
983 .fifo_size = 8,
984 .has_dmamode = true,
985 .dynamic_burst = false,
986 .has_slavemode = false,
987 .devtype = IMX35_CSPI,
988};
989
990static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
991 .intctrl = mx51_ecspi_intctrl,
992 .prepare_message = mx51_ecspi_prepare_message,
993 .prepare_transfer = mx51_ecspi_prepare_transfer,
994 .trigger = mx51_ecspi_trigger,
995 .rx_available = mx51_ecspi_rx_available,
996 .reset = mx51_ecspi_reset,
997 .setup_wml = mx51_setup_wml,
998 .disable_dma = mx51_disable_dma,
999 .fifo_size = 64,
1000 .has_dmamode = true,
1001 .dynamic_burst = true,
1002 .has_slavemode = true,
1003 .disable = mx51_ecspi_disable,
1004 .devtype = IMX51_ECSPI,
1005};
1006
1007static struct spi_imx_devtype_data imx53_ecspi_devtype_data = {
1008 .intctrl = mx51_ecspi_intctrl,
1009 .prepare_message = mx51_ecspi_prepare_message,
1010 .prepare_transfer = mx51_ecspi_prepare_transfer,
1011 .trigger = mx51_ecspi_trigger,
1012 .rx_available = mx51_ecspi_rx_available,
1013 .disable_dma = mx51_disable_dma,
1014 .reset = mx51_ecspi_reset,
1015 .fifo_size = 64,
1016 .has_dmamode = true,
1017 .has_slavemode = true,
1018 .disable = mx51_ecspi_disable,
1019 .devtype = IMX53_ECSPI,
1020};
1021
1022static const struct platform_device_id spi_imx_devtype[] = {
1023 {
1024 .name = "imx1-cspi",
1025 .driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data,
1026 }, {
1027 .name = "imx21-cspi",
1028 .driver_data = (kernel_ulong_t) &imx21_cspi_devtype_data,
1029 }, {
1030 .name = "imx27-cspi",
1031 .driver_data = (kernel_ulong_t) &imx27_cspi_devtype_data,
1032 }, {
1033 .name = "imx31-cspi",
1034 .driver_data = (kernel_ulong_t) &imx31_cspi_devtype_data,
1035 }, {
1036 .name = "imx35-cspi",
1037 .driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data,
1038 }, {
1039 .name = "imx51-ecspi",
1040 .driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data,
1041 }, {
1042 .name = "imx53-ecspi",
1043 .driver_data = (kernel_ulong_t) &imx53_ecspi_devtype_data,
1044 }, {
1045 /* sentinel */
1046 }
1047};
1048
1049static const struct of_device_id spi_imx_dt_ids[] = {
1050 { .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
1051 { .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
1052 { .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
1053 { .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
1054 { .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
1055 { .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
1056 { .compatible = "fsl,imx53-ecspi", .data = &imx53_ecspi_devtype_data, },
1057 { /* sentinel */ }
1058};
1059MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);
1060
1061static void spi_imx_set_burst_len(struct spi_imx_data *spi_imx, int n_bits)
1062{
1063 u32 ctrl;
1064
1065 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
1066 ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
1067 ctrl |= ((n_bits - 1) << MX51_ECSPI_CTRL_BL_OFFSET);
1068 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
1069}
1070
1071static void spi_imx_push(struct spi_imx_data *spi_imx)
1072{
1073 unsigned int burst_len, fifo_words;
1074
1075 if (spi_imx->dynamic_burst)
1076 fifo_words = 4;
1077 else
1078 fifo_words = spi_imx_bytes_per_word(spi_imx->bits_per_word);
1079 /*
1080 * Reload the FIFO when the remaining bytes to be transferred in the
1081 * current burst is 0. This only applies when bits_per_word is a
1082 * multiple of 8.
1083 */
1084 if (!spi_imx->remainder) {
1085 if (spi_imx->dynamic_burst) {
1086
1087 /* We need to deal unaligned data first */
1088 burst_len = spi_imx->count % MX51_ECSPI_CTRL_MAX_BURST;
1089
1090 if (!burst_len)
1091 burst_len = MX51_ECSPI_CTRL_MAX_BURST;
1092
1093 spi_imx_set_burst_len(spi_imx, burst_len * 8);
1094
1095 spi_imx->remainder = burst_len;
1096 } else {
1097 spi_imx->remainder = fifo_words;
1098 }
1099 }
1100
1101 while (spi_imx->txfifo < spi_imx->devtype_data->fifo_size) {
1102 if (!spi_imx->count)
1103 break;
1104 if (spi_imx->dynamic_burst &&
1105 spi_imx->txfifo >= DIV_ROUND_UP(spi_imx->remainder,
1106 fifo_words))
1107 break;
1108 spi_imx->tx(spi_imx);
1109 spi_imx->txfifo++;
1110 }
1111
1112 if (!spi_imx->slave_mode)
1113 spi_imx->devtype_data->trigger(spi_imx);
1114}
1115
1116static irqreturn_t spi_imx_isr(int irq, void *dev_id)
1117{
1118 struct spi_imx_data *spi_imx = dev_id;
1119
1120 while (spi_imx->txfifo &&
1121 spi_imx->devtype_data->rx_available(spi_imx)) {
1122 spi_imx->rx(spi_imx);
1123 spi_imx->txfifo--;
1124 }
1125
1126 if (spi_imx->count) {
1127 spi_imx_push(spi_imx);
1128 return IRQ_HANDLED;
1129 }
1130
1131 if (spi_imx->txfifo) {
1132 /* No data left to push, but still waiting for rx data,
1133 * enable receive data available interrupt.
1134 */
1135 spi_imx->devtype_data->intctrl(
1136 spi_imx, MXC_INT_RR);
1137 return IRQ_HANDLED;
1138 }
1139
1140 spi_imx->devtype_data->intctrl(spi_imx, 0);
1141 complete(&spi_imx->xfer_done);
1142
1143 return IRQ_HANDLED;
1144}
1145
1146static int spi_imx_dma_configure(struct spi_master *master)
1147{
1148 int ret;
1149 enum dma_slave_buswidth buswidth;
1150 struct dma_slave_config rx = {}, tx = {};
1151 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1152
1153 switch (spi_imx_bytes_per_word(spi_imx->bits_per_word)) {
1154 case 4:
1155 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
1156 break;
1157 case 2:
1158 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
1159 break;
1160 case 1:
1161 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
1162 break;
1163 default:
1164 return -EINVAL;
1165 }
1166
1167 tx.direction = DMA_MEM_TO_DEV;
1168 tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA;
1169 tx.dst_addr_width = buswidth;
1170 tx.dst_maxburst = spi_imx->wml;
1171 ret = dmaengine_slave_config(master->dma_tx, &tx);
1172 if (ret) {
1173 dev_err(spi_imx->dev, "TX dma configuration failed with %d\n", ret);
1174 return ret;
1175 }
1176
1177 rx.direction = DMA_DEV_TO_MEM;
1178 rx.src_addr = spi_imx->base_phys + MXC_CSPIRXDATA;
1179 rx.src_addr_width = buswidth;
1180 rx.src_maxburst = spi_imx->wml;
1181 ret = dmaengine_slave_config(master->dma_rx, &rx);
1182 if (ret) {
1183 dev_err(spi_imx->dev, "RX dma configuration failed with %d\n", ret);
1184 return ret;
1185 }
1186
1187 return 0;
1188}
1189
1190static int spi_imx_setupxfer(struct spi_device *spi,
1191 struct spi_transfer *t)
1192{
1193 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1194
1195 if (!t)
1196 return 0;
1197
1198 spi_imx->bits_per_word = t->bits_per_word;
1199
1200 /*
1201 * Initialize the functions for transfer. To transfer non byte-aligned
1202 * words, we have to use multiple word-size bursts, we can't use
1203 * dynamic_burst in that case.
1204 */
1205 if (spi_imx->devtype_data->dynamic_burst && !spi_imx->slave_mode &&
1206 (spi_imx->bits_per_word == 8 ||
1207 spi_imx->bits_per_word == 16 ||
1208 spi_imx->bits_per_word == 32)) {
1209
1210 spi_imx->rx = spi_imx_buf_rx_swap;
1211 spi_imx->tx = spi_imx_buf_tx_swap;
1212 spi_imx->dynamic_burst = 1;
1213
1214 } else {
1215 if (spi_imx->bits_per_word <= 8) {
1216 spi_imx->rx = spi_imx_buf_rx_u8;
1217 spi_imx->tx = spi_imx_buf_tx_u8;
1218 } else if (spi_imx->bits_per_word <= 16) {
1219 spi_imx->rx = spi_imx_buf_rx_u16;
1220 spi_imx->tx = spi_imx_buf_tx_u16;
1221 } else {
1222 spi_imx->rx = spi_imx_buf_rx_u32;
1223 spi_imx->tx = spi_imx_buf_tx_u32;
1224 }
1225 spi_imx->dynamic_burst = 0;
1226 }
1227
1228 if (spi_imx_can_dma(spi_imx->bitbang.master, spi, t))
1229 spi_imx->usedma = true;
1230 else
1231 spi_imx->usedma = false;
1232
1233 if (is_imx53_ecspi(spi_imx) && spi_imx->slave_mode) {
1234 spi_imx->rx = mx53_ecspi_rx_slave;
1235 spi_imx->tx = mx53_ecspi_tx_slave;
1236 spi_imx->slave_burst = t->len;
1237 }
1238
1239 spi_imx->devtype_data->prepare_transfer(spi_imx, spi, t);
1240
1241 return 0;
1242}
1243
1244static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
1245{
1246 struct spi_master *master = spi_imx->bitbang.master;
1247
1248 if (master->dma_rx) {
1249 dma_release_channel(master->dma_rx);
1250 master->dma_rx = NULL;
1251 }
1252
1253 if (master->dma_tx) {
1254 dma_release_channel(master->dma_tx);
1255 master->dma_tx = NULL;
1256 }
1257}
1258
1259static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
1260 struct spi_master *master)
1261{
1262 int ret;
1263
1264 /* use pio mode for i.mx6dl chip TKT238285 */
1265 if (of_machine_is_compatible("fsl,imx6dl"))
1266 return 0;
1267
1268 spi_imx->wml = spi_imx->devtype_data->fifo_size / 2;
1269
1270 /* Prepare for TX DMA: */
1271 master->dma_tx = dma_request_chan(dev, "tx");
1272 if (IS_ERR(master->dma_tx)) {
1273 ret = PTR_ERR(master->dma_tx);
1274 dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret);
1275 master->dma_tx = NULL;
1276 goto err;
1277 }
1278
1279 /* Prepare for RX : */
1280 master->dma_rx = dma_request_chan(dev, "rx");
1281 if (IS_ERR(master->dma_rx)) {
1282 ret = PTR_ERR(master->dma_rx);
1283 dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret);
1284 master->dma_rx = NULL;
1285 goto err;
1286 }
1287
1288 init_completion(&spi_imx->dma_rx_completion);
1289 init_completion(&spi_imx->dma_tx_completion);
1290 master->can_dma = spi_imx_can_dma;
1291 master->max_dma_len = MAX_SDMA_BD_BYTES;
1292 spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX |
1293 SPI_MASTER_MUST_TX;
1294
1295 return 0;
1296err:
1297 spi_imx_sdma_exit(spi_imx);
1298 return ret;
1299}
1300
1301static void spi_imx_dma_rx_callback(void *cookie)
1302{
1303 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
1304
1305 complete(&spi_imx->dma_rx_completion);
1306}
1307
1308static void spi_imx_dma_tx_callback(void *cookie)
1309{
1310 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
1311
1312 complete(&spi_imx->dma_tx_completion);
1313}
1314
1315static int spi_imx_calculate_timeout(struct spi_imx_data *spi_imx, int size)
1316{
1317 unsigned long timeout = 0;
1318
1319 /* Time with actual data transfer and CS change delay related to HW */
1320 timeout = (8 + 4) * size / spi_imx->spi_bus_clk;
1321
1322 /* Add extra second for scheduler related activities */
1323 timeout += 1;
1324
1325 /* Double calculated timeout */
1326 return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC);
1327}
1328
1329static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
1330 struct spi_transfer *transfer)
1331{
1332 struct dma_async_tx_descriptor *desc_tx, *desc_rx;
1333 unsigned long transfer_timeout;
1334 unsigned long timeout;
1335 struct spi_master *master = spi_imx->bitbang.master;
1336 struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
1337 struct scatterlist *last_sg = sg_last(rx->sgl, rx->nents);
1338 unsigned int bytes_per_word, i;
1339 int ret;
1340
1341 /* Get the right burst length from the last sg to ensure no tail data */
1342 bytes_per_word = spi_imx_bytes_per_word(transfer->bits_per_word);
1343 for (i = spi_imx->devtype_data->fifo_size / 2; i > 0; i--) {
1344 if (!(sg_dma_len(last_sg) % (i * bytes_per_word)))
1345 break;
1346 }
1347 /* Use 1 as wml in case no available burst length got */
1348 if (i == 0)
1349 i = 1;
1350
1351 spi_imx->wml = i;
1352
1353 ret = spi_imx_dma_configure(master);
1354 if (ret)
1355 goto dma_failure_no_start;
1356
1357 if (!spi_imx->devtype_data->setup_wml) {
1358 dev_err(spi_imx->dev, "No setup_wml()?\n");
1359 ret = -EINVAL;
1360 goto dma_failure_no_start;
1361 }
1362 spi_imx->devtype_data->setup_wml(spi_imx);
1363
1364 /*
1365 * The TX DMA setup starts the transfer, so make sure RX is configured
1366 * before TX.
1367 */
1368 desc_rx = dmaengine_prep_slave_sg(master->dma_rx,
1369 rx->sgl, rx->nents, DMA_DEV_TO_MEM,
1370 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1371 if (!desc_rx) {
1372 ret = -EINVAL;
1373 goto dma_failure_no_start;
1374 }
1375
1376 desc_rx->callback = spi_imx_dma_rx_callback;
1377 desc_rx->callback_param = (void *)spi_imx;
1378 dmaengine_submit(desc_rx);
1379 reinit_completion(&spi_imx->dma_rx_completion);
1380 dma_async_issue_pending(master->dma_rx);
1381
1382 desc_tx = dmaengine_prep_slave_sg(master->dma_tx,
1383 tx->sgl, tx->nents, DMA_MEM_TO_DEV,
1384 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1385 if (!desc_tx) {
1386 dmaengine_terminate_all(master->dma_tx);
1387 dmaengine_terminate_all(master->dma_rx);
1388 return -EINVAL;
1389 }
1390
1391 desc_tx->callback = spi_imx_dma_tx_callback;
1392 desc_tx->callback_param = (void *)spi_imx;
1393 dmaengine_submit(desc_tx);
1394 reinit_completion(&spi_imx->dma_tx_completion);
1395 dma_async_issue_pending(master->dma_tx);
1396
1397 transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1398
1399 /* Wait SDMA to finish the data transfer.*/
1400 timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
1401 transfer_timeout);
1402 if (!timeout) {
1403 dev_err(spi_imx->dev, "I/O Error in DMA TX\n");
1404 dmaengine_terminate_all(master->dma_tx);
1405 dmaengine_terminate_all(master->dma_rx);
1406 return -ETIMEDOUT;
1407 }
1408
1409 timeout = wait_for_completion_timeout(&spi_imx->dma_rx_completion,
1410 transfer_timeout);
1411 if (!timeout) {
1412 dev_err(&master->dev, "I/O Error in DMA RX\n");
1413 spi_imx->devtype_data->reset(spi_imx);
1414 dmaengine_terminate_all(master->dma_rx);
1415 return -ETIMEDOUT;
1416 }
1417
1418 return transfer->len;
1419/* fallback to pio */
1420dma_failure_no_start:
1421 transfer->error |= SPI_TRANS_FAIL_NO_START;
1422 return ret;
1423}
1424
1425static int spi_imx_pio_transfer(struct spi_device *spi,
1426 struct spi_transfer *transfer)
1427{
1428 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1429 unsigned long transfer_timeout;
1430 unsigned long timeout;
1431
1432 spi_imx->tx_buf = transfer->tx_buf;
1433 spi_imx->rx_buf = transfer->rx_buf;
1434 spi_imx->count = transfer->len;
1435 spi_imx->txfifo = 0;
1436 spi_imx->remainder = 0;
1437
1438 reinit_completion(&spi_imx->xfer_done);
1439
1440 spi_imx_push(spi_imx);
1441
1442 spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE);
1443
1444 transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1445
1446 timeout = wait_for_completion_timeout(&spi_imx->xfer_done,
1447 transfer_timeout);
1448 if (!timeout) {
1449 dev_err(&spi->dev, "I/O Error in PIO\n");
1450 spi_imx->devtype_data->reset(spi_imx);
1451 return -ETIMEDOUT;
1452 }
1453
1454 return transfer->len;
1455}
1456
1457static int spi_imx_pio_transfer_slave(struct spi_device *spi,
1458 struct spi_transfer *transfer)
1459{
1460 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1461 int ret = transfer->len;
1462
1463 if (is_imx53_ecspi(spi_imx) &&
1464 transfer->len > MX53_MAX_TRANSFER_BYTES) {
1465 dev_err(&spi->dev, "Transaction too big, max size is %d bytes\n",
1466 MX53_MAX_TRANSFER_BYTES);
1467 return -EMSGSIZE;
1468 }
1469
1470 spi_imx->tx_buf = transfer->tx_buf;
1471 spi_imx->rx_buf = transfer->rx_buf;
1472 spi_imx->count = transfer->len;
1473 spi_imx->txfifo = 0;
1474 spi_imx->remainder = 0;
1475
1476 reinit_completion(&spi_imx->xfer_done);
1477 spi_imx->slave_aborted = false;
1478
1479 spi_imx_push(spi_imx);
1480
1481 spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE | MXC_INT_RDR);
1482
1483 if (wait_for_completion_interruptible(&spi_imx->xfer_done) ||
1484 spi_imx->slave_aborted) {
1485 dev_dbg(&spi->dev, "interrupted\n");
1486 ret = -EINTR;
1487 }
1488
1489 /* ecspi has a HW issue when works in Slave mode,
1490 * after 64 words writtern to TXFIFO, even TXFIFO becomes empty,
1491 * ECSPI_TXDATA keeps shift out the last word data,
1492 * so we have to disable ECSPI when in slave mode after the
1493 * transfer completes
1494 */
1495 if (spi_imx->devtype_data->disable)
1496 spi_imx->devtype_data->disable(spi_imx);
1497
1498 return ret;
1499}
1500
1501static int spi_imx_transfer(struct spi_device *spi,
1502 struct spi_transfer *transfer)
1503{
1504 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1505
1506 /* flush rxfifo before transfer */
1507 while (spi_imx->devtype_data->rx_available(spi_imx))
1508 readl(spi_imx->base + MXC_CSPIRXDATA);
1509
1510 if (spi_imx->slave_mode)
1511 return spi_imx_pio_transfer_slave(spi, transfer);
1512
1513 if (spi_imx->usedma)
1514 return spi_imx_dma_transfer(spi_imx, transfer);
1515
1516 return spi_imx_pio_transfer(spi, transfer);
1517}
1518
1519static int spi_imx_setup(struct spi_device *spi)
1520{
1521 dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__,
1522 spi->mode, spi->bits_per_word, spi->max_speed_hz);
1523
1524 return 0;
1525}
1526
1527static void spi_imx_cleanup(struct spi_device *spi)
1528{
1529}
1530
1531static int
1532spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg)
1533{
1534 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1535 int ret;
1536
1537 ret = pm_runtime_get_sync(spi_imx->dev);
1538 if (ret < 0) {
1539 dev_err(spi_imx->dev, "failed to enable clock\n");
1540 return ret;
1541 }
1542
1543 ret = spi_imx->devtype_data->prepare_message(spi_imx, msg);
1544 if (ret) {
1545 pm_runtime_mark_last_busy(spi_imx->dev);
1546 pm_runtime_put_autosuspend(spi_imx->dev);
1547 }
1548
1549 return ret;
1550}
1551
1552static int
1553spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg)
1554{
1555 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1556
1557 pm_runtime_mark_last_busy(spi_imx->dev);
1558 pm_runtime_put_autosuspend(spi_imx->dev);
1559 return 0;
1560}
1561
1562static int spi_imx_slave_abort(struct spi_master *master)
1563{
1564 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1565
1566 spi_imx->slave_aborted = true;
1567 complete(&spi_imx->xfer_done);
1568
1569 return 0;
1570}
1571
1572static int spi_imx_probe(struct platform_device *pdev)
1573{
1574 struct device_node *np = pdev->dev.of_node;
1575 const struct of_device_id *of_id =
1576 of_match_device(spi_imx_dt_ids, &pdev->dev);
1577 struct spi_master *master;
1578 struct spi_imx_data *spi_imx;
1579 struct resource *res;
1580 int ret, irq, spi_drctl;
1581 const struct spi_imx_devtype_data *devtype_data = of_id ? of_id->data :
1582 (struct spi_imx_devtype_data *)pdev->id_entry->driver_data;
1583 bool slave_mode;
1584 u32 val;
1585
1586 slave_mode = devtype_data->has_slavemode &&
1587 of_property_read_bool(np, "spi-slave");
1588 if (slave_mode)
1589 master = spi_alloc_slave(&pdev->dev,
1590 sizeof(struct spi_imx_data));
1591 else
1592 master = spi_alloc_master(&pdev->dev,
1593 sizeof(struct spi_imx_data));
1594 if (!master)
1595 return -ENOMEM;
1596
1597 ret = of_property_read_u32(np, "fsl,spi-rdy-drctl", &spi_drctl);
1598 if ((ret < 0) || (spi_drctl >= 0x3)) {
1599 /* '11' is reserved */
1600 spi_drctl = 0;
1601 }
1602
1603 platform_set_drvdata(pdev, master);
1604
1605 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
1606 master->bus_num = np ? -1 : pdev->id;
1607 master->use_gpio_descriptors = true;
1608
1609 spi_imx = spi_master_get_devdata(master);
1610 spi_imx->bitbang.master = master;
1611 spi_imx->dev = &pdev->dev;
1612 spi_imx->slave_mode = slave_mode;
1613
1614 spi_imx->devtype_data = devtype_data;
1615
1616 /*
1617 * Get number of chip selects from device properties. This can be
1618 * coming from device tree or boardfiles, if it is not defined,
1619 * a default value of 3 chip selects will be used, as all the legacy
1620 * board files have <= 3 chip selects.
1621 */
1622 if (!device_property_read_u32(&pdev->dev, "num-cs", &val))
1623 master->num_chipselect = val;
1624 else
1625 master->num_chipselect = 3;
1626
1627 spi_imx->bitbang.setup_transfer = spi_imx_setupxfer;
1628 spi_imx->bitbang.txrx_bufs = spi_imx_transfer;
1629 spi_imx->bitbang.master->setup = spi_imx_setup;
1630 spi_imx->bitbang.master->cleanup = spi_imx_cleanup;
1631 spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message;
1632 spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message;
1633 spi_imx->bitbang.master->slave_abort = spi_imx_slave_abort;
1634 spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \
1635 | SPI_NO_CS;
1636 if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) ||
1637 is_imx53_ecspi(spi_imx))
1638 spi_imx->bitbang.master->mode_bits |= SPI_LOOP | SPI_READY;
1639
1640 spi_imx->spi_drctl = spi_drctl;
1641
1642 init_completion(&spi_imx->xfer_done);
1643
1644 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1645 spi_imx->base = devm_ioremap_resource(&pdev->dev, res);
1646 if (IS_ERR(spi_imx->base)) {
1647 ret = PTR_ERR(spi_imx->base);
1648 goto out_master_put;
1649 }
1650 spi_imx->base_phys = res->start;
1651
1652 irq = platform_get_irq(pdev, 0);
1653 if (irq < 0) {
1654 ret = irq;
1655 goto out_master_put;
1656 }
1657
1658 ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0,
1659 dev_name(&pdev->dev), spi_imx);
1660 if (ret) {
1661 dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
1662 goto out_master_put;
1663 }
1664
1665 spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1666 if (IS_ERR(spi_imx->clk_ipg)) {
1667 ret = PTR_ERR(spi_imx->clk_ipg);
1668 goto out_master_put;
1669 }
1670
1671 spi_imx->clk_per = devm_clk_get(&pdev->dev, "per");
1672 if (IS_ERR(spi_imx->clk_per)) {
1673 ret = PTR_ERR(spi_imx->clk_per);
1674 goto out_master_put;
1675 }
1676
1677 pm_runtime_enable(spi_imx->dev);
1678 pm_runtime_set_autosuspend_delay(spi_imx->dev, MXC_RPM_TIMEOUT);
1679 pm_runtime_use_autosuspend(spi_imx->dev);
1680
1681 ret = pm_runtime_get_sync(spi_imx->dev);
1682 if (ret < 0) {
1683 dev_err(spi_imx->dev, "failed to enable clock\n");
1684 goto out_runtime_pm_put;
1685 }
1686
1687 spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
1688 /*
1689 * Only validated on i.mx35 and i.mx6 now, can remove the constraint
1690 * if validated on other chips.
1691 */
1692 if (spi_imx->devtype_data->has_dmamode) {
1693 ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master);
1694 if (ret == -EPROBE_DEFER)
1695 goto out_runtime_pm_put;
1696
1697 if (ret < 0)
1698 dev_err(&pdev->dev, "dma setup error %d, use pio\n",
1699 ret);
1700 }
1701
1702 spi_imx->devtype_data->reset(spi_imx);
1703
1704 spi_imx->devtype_data->intctrl(spi_imx, 0);
1705
1706 master->dev.of_node = pdev->dev.of_node;
1707 ret = spi_bitbang_start(&spi_imx->bitbang);
1708 if (ret) {
1709 dev_err(&pdev->dev, "bitbang start failed with %d\n", ret);
1710 goto out_runtime_pm_put;
1711 }
1712
1713 dev_info(&pdev->dev, "probed\n");
1714
1715 pm_runtime_mark_last_busy(spi_imx->dev);
1716 pm_runtime_put_autosuspend(spi_imx->dev);
1717
1718 return ret;
1719
1720out_runtime_pm_put:
1721 pm_runtime_dont_use_autosuspend(spi_imx->dev);
1722 pm_runtime_put_sync(spi_imx->dev);
1723 pm_runtime_disable(spi_imx->dev);
1724out_master_put:
1725 spi_master_put(master);
1726
1727 return ret;
1728}
1729
1730static int spi_imx_remove(struct platform_device *pdev)
1731{
1732 struct spi_master *master = platform_get_drvdata(pdev);
1733 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1734 int ret;
1735
1736 spi_bitbang_stop(&spi_imx->bitbang);
1737
1738 ret = pm_runtime_get_sync(spi_imx->dev);
1739 if (ret < 0) {
1740 dev_err(spi_imx->dev, "failed to enable clock\n");
1741 return ret;
1742 }
1743
1744 writel(0, spi_imx->base + MXC_CSPICTRL);
1745
1746 pm_runtime_dont_use_autosuspend(spi_imx->dev);
1747 pm_runtime_put_sync(spi_imx->dev);
1748 pm_runtime_disable(spi_imx->dev);
1749
1750 spi_imx_sdma_exit(spi_imx);
1751 spi_master_put(master);
1752
1753 return 0;
1754}
1755
1756static int __maybe_unused spi_imx_runtime_resume(struct device *dev)
1757{
1758 struct spi_master *master = dev_get_drvdata(dev);
1759 struct spi_imx_data *spi_imx;
1760 int ret;
1761
1762 spi_imx = spi_master_get_devdata(master);
1763
1764 ret = clk_prepare_enable(spi_imx->clk_per);
1765 if (ret)
1766 return ret;
1767
1768 ret = clk_prepare_enable(spi_imx->clk_ipg);
1769 if (ret) {
1770 clk_disable_unprepare(spi_imx->clk_per);
1771 return ret;
1772 }
1773
1774 return 0;
1775}
1776
1777static int __maybe_unused spi_imx_runtime_suspend(struct device *dev)
1778{
1779 struct spi_master *master = dev_get_drvdata(dev);
1780 struct spi_imx_data *spi_imx;
1781
1782 spi_imx = spi_master_get_devdata(master);
1783
1784 clk_disable_unprepare(spi_imx->clk_per);
1785 clk_disable_unprepare(spi_imx->clk_ipg);
1786
1787 return 0;
1788}
1789
1790static int __maybe_unused spi_imx_suspend(struct device *dev)
1791{
1792 pinctrl_pm_select_sleep_state(dev);
1793 return 0;
1794}
1795
1796static int __maybe_unused spi_imx_resume(struct device *dev)
1797{
1798 pinctrl_pm_select_default_state(dev);
1799 return 0;
1800}
1801
1802static const struct dev_pm_ops imx_spi_pm = {
1803 SET_RUNTIME_PM_OPS(spi_imx_runtime_suspend,
1804 spi_imx_runtime_resume, NULL)
1805 SET_SYSTEM_SLEEP_PM_OPS(spi_imx_suspend, spi_imx_resume)
1806};
1807
1808static struct platform_driver spi_imx_driver = {
1809 .driver = {
1810 .name = DRIVER_NAME,
1811 .of_match_table = spi_imx_dt_ids,
1812 .pm = &imx_spi_pm,
1813 },
1814 .id_table = spi_imx_devtype,
1815 .probe = spi_imx_probe,
1816 .remove = spi_imx_remove,
1817};
1818module_platform_driver(spi_imx_driver);
1819
1820MODULE_DESCRIPTION("SPI Controller driver");
1821MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1822MODULE_LICENSE("GPL");
1823MODULE_ALIAS("platform:" DRIVER_NAME);
1/*
2 * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
3 * Copyright (C) 2008 Juergen Beisert
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation
17 * 51 Franklin Street, Fifth Floor
18 * Boston, MA 02110-1301, USA.
19 */
20
21#include <linux/clk.h>
22#include <linux/completion.h>
23#include <linux/delay.h>
24#include <linux/dmaengine.h>
25#include <linux/dma-mapping.h>
26#include <linux/err.h>
27#include <linux/gpio.h>
28#include <linux/interrupt.h>
29#include <linux/io.h>
30#include <linux/irq.h>
31#include <linux/kernel.h>
32#include <linux/module.h>
33#include <linux/platform_device.h>
34#include <linux/slab.h>
35#include <linux/spi/spi.h>
36#include <linux/spi/spi_bitbang.h>
37#include <linux/types.h>
38#include <linux/of.h>
39#include <linux/of_device.h>
40#include <linux/of_gpio.h>
41
42#include <linux/platform_data/dma-imx.h>
43#include <linux/platform_data/spi-imx.h>
44
45#define DRIVER_NAME "spi_imx"
46
47#define MXC_CSPIRXDATA 0x00
48#define MXC_CSPITXDATA 0x04
49#define MXC_CSPICTRL 0x08
50#define MXC_CSPIINT 0x0c
51#define MXC_RESET 0x1c
52
53/* generic defines to abstract from the different register layouts */
54#define MXC_INT_RR (1 << 0) /* Receive data ready interrupt */
55#define MXC_INT_TE (1 << 1) /* Transmit FIFO empty interrupt */
56#define MXC_INT_RDR BIT(4) /* Receive date threshold interrupt */
57
58/* The maximum bytes that a sdma BD can transfer.*/
59#define MAX_SDMA_BD_BYTES (1 << 15)
60#define MX51_ECSPI_CTRL_MAX_BURST 512
61/* The maximum bytes that IMX53_ECSPI can transfer in slave mode.*/
62#define MX53_MAX_TRANSFER_BYTES 512
63
64enum spi_imx_devtype {
65 IMX1_CSPI,
66 IMX21_CSPI,
67 IMX27_CSPI,
68 IMX31_CSPI,
69 IMX35_CSPI, /* CSPI on all i.mx except above */
70 IMX51_ECSPI, /* ECSPI on i.mx51 */
71 IMX53_ECSPI, /* ECSPI on i.mx53 and later */
72};
73
74struct spi_imx_data;
75
76struct spi_imx_devtype_data {
77 void (*intctrl)(struct spi_imx_data *, int);
78 int (*config)(struct spi_device *);
79 void (*trigger)(struct spi_imx_data *);
80 int (*rx_available)(struct spi_imx_data *);
81 void (*reset)(struct spi_imx_data *);
82 void (*disable)(struct spi_imx_data *);
83 bool has_dmamode;
84 bool has_slavemode;
85 unsigned int fifo_size;
86 bool dynamic_burst;
87 enum spi_imx_devtype devtype;
88};
89
90struct spi_imx_data {
91 struct spi_bitbang bitbang;
92 struct device *dev;
93
94 struct completion xfer_done;
95 void __iomem *base;
96 unsigned long base_phys;
97
98 struct clk *clk_per;
99 struct clk *clk_ipg;
100 unsigned long spi_clk;
101 unsigned int spi_bus_clk;
102
103 unsigned int speed_hz;
104 unsigned int bits_per_word;
105 unsigned int spi_drctl;
106
107 unsigned int count, remainder;
108 void (*tx)(struct spi_imx_data *);
109 void (*rx)(struct spi_imx_data *);
110 void *rx_buf;
111 const void *tx_buf;
112 unsigned int txfifo; /* number of words pushed in tx FIFO */
113 unsigned int dynamic_burst, read_u32;
114 unsigned int word_mask;
115
116 /* Slave mode */
117 bool slave_mode;
118 bool slave_aborted;
119 unsigned int slave_burst;
120
121 /* DMA */
122 bool usedma;
123 u32 wml;
124 struct completion dma_rx_completion;
125 struct completion dma_tx_completion;
126
127 const struct spi_imx_devtype_data *devtype_data;
128};
129
130static inline int is_imx27_cspi(struct spi_imx_data *d)
131{
132 return d->devtype_data->devtype == IMX27_CSPI;
133}
134
135static inline int is_imx35_cspi(struct spi_imx_data *d)
136{
137 return d->devtype_data->devtype == IMX35_CSPI;
138}
139
140static inline int is_imx51_ecspi(struct spi_imx_data *d)
141{
142 return d->devtype_data->devtype == IMX51_ECSPI;
143}
144
145static inline int is_imx53_ecspi(struct spi_imx_data *d)
146{
147 return d->devtype_data->devtype == IMX53_ECSPI;
148}
149
150#define MXC_SPI_BUF_RX(type) \
151static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx) \
152{ \
153 unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); \
154 \
155 if (spi_imx->rx_buf) { \
156 *(type *)spi_imx->rx_buf = val; \
157 spi_imx->rx_buf += sizeof(type); \
158 } \
159}
160
161#define MXC_SPI_BUF_TX(type) \
162static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx) \
163{ \
164 type val = 0; \
165 \
166 if (spi_imx->tx_buf) { \
167 val = *(type *)spi_imx->tx_buf; \
168 spi_imx->tx_buf += sizeof(type); \
169 } \
170 \
171 spi_imx->count -= sizeof(type); \
172 \
173 writel(val, spi_imx->base + MXC_CSPITXDATA); \
174}
175
176MXC_SPI_BUF_RX(u8)
177MXC_SPI_BUF_TX(u8)
178MXC_SPI_BUF_RX(u16)
179MXC_SPI_BUF_TX(u16)
180MXC_SPI_BUF_RX(u32)
181MXC_SPI_BUF_TX(u32)
182
183/* First entry is reserved, second entry is valid only if SDHC_SPIEN is set
184 * (which is currently not the case in this driver)
185 */
186static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192,
187 256, 384, 512, 768, 1024};
188
189/* MX21, MX27 */
190static unsigned int spi_imx_clkdiv_1(unsigned int fin,
191 unsigned int fspi, unsigned int max, unsigned int *fres)
192{
193 int i;
194
195 for (i = 2; i < max; i++)
196 if (fspi * mxc_clkdivs[i] >= fin)
197 break;
198
199 *fres = fin / mxc_clkdivs[i];
200 return i;
201}
202
203/* MX1, MX31, MX35, MX51 CSPI */
204static unsigned int spi_imx_clkdiv_2(unsigned int fin,
205 unsigned int fspi, unsigned int *fres)
206{
207 int i, div = 4;
208
209 for (i = 0; i < 7; i++) {
210 if (fspi * div >= fin)
211 goto out;
212 div <<= 1;
213 }
214
215out:
216 *fres = fin / div;
217 return i;
218}
219
220static int spi_imx_bytes_per_word(const int bits_per_word)
221{
222 return DIV_ROUND_UP(bits_per_word, BITS_PER_BYTE);
223}
224
225static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
226 struct spi_transfer *transfer)
227{
228 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
229 unsigned int bytes_per_word, i;
230
231 if (!master->dma_rx)
232 return false;
233
234 if (spi_imx->slave_mode)
235 return false;
236
237 bytes_per_word = spi_imx_bytes_per_word(transfer->bits_per_word);
238
239 if (bytes_per_word != 1 && bytes_per_word != 2 && bytes_per_word != 4)
240 return false;
241
242 for (i = spi_imx->devtype_data->fifo_size / 2; i > 0; i--) {
243 if (!(transfer->len % (i * bytes_per_word)))
244 break;
245 }
246
247 if (i == 0)
248 return false;
249
250 spi_imx->wml = i;
251 spi_imx->dynamic_burst = 0;
252
253 return true;
254}
255
256#define MX51_ECSPI_CTRL 0x08
257#define MX51_ECSPI_CTRL_ENABLE (1 << 0)
258#define MX51_ECSPI_CTRL_XCH (1 << 2)
259#define MX51_ECSPI_CTRL_SMC (1 << 3)
260#define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4)
261#define MX51_ECSPI_CTRL_DRCTL(drctl) ((drctl) << 16)
262#define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8
263#define MX51_ECSPI_CTRL_PREDIV_OFFSET 12
264#define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18)
265#define MX51_ECSPI_CTRL_BL_OFFSET 20
266#define MX51_ECSPI_CTRL_BL_MASK (0xfff << 20)
267
268#define MX51_ECSPI_CONFIG 0x0c
269#define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0))
270#define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs) + 4))
271#define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs) + 8))
272#define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs) + 12))
273#define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs) + 20))
274
275#define MX51_ECSPI_INT 0x10
276#define MX51_ECSPI_INT_TEEN (1 << 0)
277#define MX51_ECSPI_INT_RREN (1 << 3)
278#define MX51_ECSPI_INT_RDREN (1 << 4)
279
280#define MX51_ECSPI_DMA 0x14
281#define MX51_ECSPI_DMA_TX_WML(wml) ((wml) & 0x3f)
282#define MX51_ECSPI_DMA_RX_WML(wml) (((wml) & 0x3f) << 16)
283#define MX51_ECSPI_DMA_RXT_WML(wml) (((wml) & 0x3f) << 24)
284
285#define MX51_ECSPI_DMA_TEDEN (1 << 7)
286#define MX51_ECSPI_DMA_RXDEN (1 << 23)
287#define MX51_ECSPI_DMA_RXTDEN (1 << 31)
288
289#define MX51_ECSPI_STAT 0x18
290#define MX51_ECSPI_STAT_RR (1 << 3)
291
292#define MX51_ECSPI_TESTREG 0x20
293#define MX51_ECSPI_TESTREG_LBC BIT(31)
294
295static void spi_imx_buf_rx_swap_u32(struct spi_imx_data *spi_imx)
296{
297 unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA);
298#ifdef __LITTLE_ENDIAN
299 unsigned int bytes_per_word;
300#endif
301
302 if (spi_imx->rx_buf) {
303#ifdef __LITTLE_ENDIAN
304 bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
305 if (bytes_per_word == 1)
306 val = cpu_to_be32(val);
307 else if (bytes_per_word == 2)
308 val = (val << 16) | (val >> 16);
309#endif
310 val &= spi_imx->word_mask;
311 *(u32 *)spi_imx->rx_buf = val;
312 spi_imx->rx_buf += sizeof(u32);
313 }
314}
315
316static void spi_imx_buf_rx_swap(struct spi_imx_data *spi_imx)
317{
318 unsigned int bytes_per_word;
319
320 bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
321 if (spi_imx->read_u32) {
322 spi_imx_buf_rx_swap_u32(spi_imx);
323 return;
324 }
325
326 if (bytes_per_word == 1)
327 spi_imx_buf_rx_u8(spi_imx);
328 else if (bytes_per_word == 2)
329 spi_imx_buf_rx_u16(spi_imx);
330}
331
332static void spi_imx_buf_tx_swap_u32(struct spi_imx_data *spi_imx)
333{
334 u32 val = 0;
335#ifdef __LITTLE_ENDIAN
336 unsigned int bytes_per_word;
337#endif
338
339 if (spi_imx->tx_buf) {
340 val = *(u32 *)spi_imx->tx_buf;
341 val &= spi_imx->word_mask;
342 spi_imx->tx_buf += sizeof(u32);
343 }
344
345 spi_imx->count -= sizeof(u32);
346#ifdef __LITTLE_ENDIAN
347 bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
348
349 if (bytes_per_word == 1)
350 val = cpu_to_be32(val);
351 else if (bytes_per_word == 2)
352 val = (val << 16) | (val >> 16);
353#endif
354 writel(val, spi_imx->base + MXC_CSPITXDATA);
355}
356
357static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx)
358{
359 u32 ctrl, val;
360 unsigned int bytes_per_word;
361
362 if (spi_imx->count == spi_imx->remainder) {
363 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
364 ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
365 if (spi_imx->count > MX51_ECSPI_CTRL_MAX_BURST) {
366 spi_imx->remainder = spi_imx->count %
367 MX51_ECSPI_CTRL_MAX_BURST;
368 val = MX51_ECSPI_CTRL_MAX_BURST * 8 - 1;
369 } else if (spi_imx->count >= sizeof(u32)) {
370 spi_imx->remainder = spi_imx->count % sizeof(u32);
371 val = (spi_imx->count - spi_imx->remainder) * 8 - 1;
372 } else {
373 spi_imx->remainder = 0;
374 val = spi_imx->bits_per_word - 1;
375 spi_imx->read_u32 = 0;
376 }
377
378 ctrl |= (val << MX51_ECSPI_CTRL_BL_OFFSET);
379 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
380 }
381
382 if (spi_imx->count >= sizeof(u32)) {
383 spi_imx_buf_tx_swap_u32(spi_imx);
384 return;
385 }
386
387 bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
388
389 if (bytes_per_word == 1)
390 spi_imx_buf_tx_u8(spi_imx);
391 else if (bytes_per_word == 2)
392 spi_imx_buf_tx_u16(spi_imx);
393}
394
395static void mx53_ecspi_rx_slave(struct spi_imx_data *spi_imx)
396{
397 u32 val = be32_to_cpu(readl(spi_imx->base + MXC_CSPIRXDATA));
398
399 if (spi_imx->rx_buf) {
400 int n_bytes = spi_imx->slave_burst % sizeof(val);
401
402 if (!n_bytes)
403 n_bytes = sizeof(val);
404
405 memcpy(spi_imx->rx_buf,
406 ((u8 *)&val) + sizeof(val) - n_bytes, n_bytes);
407
408 spi_imx->rx_buf += n_bytes;
409 spi_imx->slave_burst -= n_bytes;
410 }
411}
412
413static void mx53_ecspi_tx_slave(struct spi_imx_data *spi_imx)
414{
415 u32 val = 0;
416 int n_bytes = spi_imx->count % sizeof(val);
417
418 if (!n_bytes)
419 n_bytes = sizeof(val);
420
421 if (spi_imx->tx_buf) {
422 memcpy(((u8 *)&val) + sizeof(val) - n_bytes,
423 spi_imx->tx_buf, n_bytes);
424 val = cpu_to_be32(val);
425 spi_imx->tx_buf += n_bytes;
426 }
427
428 spi_imx->count -= n_bytes;
429
430 writel(val, spi_imx->base + MXC_CSPITXDATA);
431}
432
433/* MX51 eCSPI */
434static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx,
435 unsigned int fspi, unsigned int *fres)
436{
437 /*
438 * there are two 4-bit dividers, the pre-divider divides by
439 * $pre, the post-divider by 2^$post
440 */
441 unsigned int pre, post;
442 unsigned int fin = spi_imx->spi_clk;
443
444 if (unlikely(fspi > fin))
445 return 0;
446
447 post = fls(fin) - fls(fspi);
448 if (fin > fspi << post)
449 post++;
450
451 /* now we have: (fin <= fspi << post) with post being minimal */
452
453 post = max(4U, post) - 4;
454 if (unlikely(post > 0xf)) {
455 dev_err(spi_imx->dev, "cannot set clock freq: %u (base freq: %u)\n",
456 fspi, fin);
457 return 0xff;
458 }
459
460 pre = DIV_ROUND_UP(fin, fspi << post) - 1;
461
462 dev_dbg(spi_imx->dev, "%s: fin: %u, fspi: %u, post: %u, pre: %u\n",
463 __func__, fin, fspi, post, pre);
464
465 /* Resulting frequency for the SCLK line. */
466 *fres = (fin / (pre + 1)) >> post;
467
468 return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) |
469 (post << MX51_ECSPI_CTRL_POSTDIV_OFFSET);
470}
471
472static void mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
473{
474 unsigned val = 0;
475
476 if (enable & MXC_INT_TE)
477 val |= MX51_ECSPI_INT_TEEN;
478
479 if (enable & MXC_INT_RR)
480 val |= MX51_ECSPI_INT_RREN;
481
482 if (enable & MXC_INT_RDR)
483 val |= MX51_ECSPI_INT_RDREN;
484
485 writel(val, spi_imx->base + MX51_ECSPI_INT);
486}
487
488static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
489{
490 u32 reg;
491
492 reg = readl(spi_imx->base + MX51_ECSPI_CTRL);
493 reg |= MX51_ECSPI_CTRL_XCH;
494 writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
495}
496
497static void mx51_ecspi_disable(struct spi_imx_data *spi_imx)
498{
499 u32 ctrl;
500
501 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
502 ctrl &= ~MX51_ECSPI_CTRL_ENABLE;
503 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
504}
505
506static int mx51_ecspi_config(struct spi_device *spi)
507{
508 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
509 u32 ctrl = MX51_ECSPI_CTRL_ENABLE;
510 u32 clk = spi_imx->speed_hz, delay, reg;
511 u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
512
513 /* set Master or Slave mode */
514 if (spi_imx->slave_mode)
515 ctrl &= ~MX51_ECSPI_CTRL_MODE_MASK;
516 else
517 ctrl |= MX51_ECSPI_CTRL_MODE_MASK;
518
519 /*
520 * Enable SPI_RDY handling (falling edge/level triggered).
521 */
522 if (spi->mode & SPI_READY)
523 ctrl |= MX51_ECSPI_CTRL_DRCTL(spi_imx->spi_drctl);
524
525 /* set clock speed */
526 ctrl |= mx51_ecspi_clkdiv(spi_imx, spi_imx->speed_hz, &clk);
527 spi_imx->spi_bus_clk = clk;
528
529 /* set chip select to use */
530 ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select);
531
532 if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx))
533 ctrl |= (spi_imx->slave_burst * 8 - 1)
534 << MX51_ECSPI_CTRL_BL_OFFSET;
535 else
536 ctrl |= (spi_imx->bits_per_word - 1)
537 << MX51_ECSPI_CTRL_BL_OFFSET;
538
539 /*
540 * eCSPI burst completion by Chip Select signal in Slave mode
541 * is not functional for imx53 Soc, config SPI burst completed when
542 * BURST_LENGTH + 1 bits are received
543 */
544 if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx))
545 cfg &= ~MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select);
546 else
547 cfg |= MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select);
548
549 if (spi->mode & SPI_CPHA)
550 cfg |= MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
551 else
552 cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
553
554 if (spi->mode & SPI_CPOL) {
555 cfg |= MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select);
556 cfg |= MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select);
557 } else {
558 cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select);
559 cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select);
560 }
561 if (spi->mode & SPI_CS_HIGH)
562 cfg |= MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select);
563 else
564 cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select);
565
566 if (spi_imx->usedma)
567 ctrl |= MX51_ECSPI_CTRL_SMC;
568
569 /* CTRL register always go first to bring out controller from reset */
570 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
571
572 reg = readl(spi_imx->base + MX51_ECSPI_TESTREG);
573 if (spi->mode & SPI_LOOP)
574 reg |= MX51_ECSPI_TESTREG_LBC;
575 else
576 reg &= ~MX51_ECSPI_TESTREG_LBC;
577 writel(reg, spi_imx->base + MX51_ECSPI_TESTREG);
578
579 writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
580
581 /*
582 * Wait until the changes in the configuration register CONFIGREG
583 * propagate into the hardware. It takes exactly one tick of the
584 * SCLK clock, but we will wait two SCLK clock just to be sure. The
585 * effect of the delay it takes for the hardware to apply changes
586 * is noticable if the SCLK clock run very slow. In such a case, if
587 * the polarity of SCLK should be inverted, the GPIO ChipSelect might
588 * be asserted before the SCLK polarity changes, which would disrupt
589 * the SPI communication as the device on the other end would consider
590 * the change of SCLK polarity as a clock tick already.
591 */
592 delay = (2 * 1000000) / clk;
593 if (likely(delay < 10)) /* SCLK is faster than 100 kHz */
594 udelay(delay);
595 else /* SCLK is _very_ slow */
596 usleep_range(delay, delay + 10);
597
598 /*
599 * Configure the DMA register: setup the watermark
600 * and enable DMA request.
601 */
602
603 writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml) |
604 MX51_ECSPI_DMA_TX_WML(spi_imx->wml) |
605 MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) |
606 MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN |
607 MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);
608
609 return 0;
610}
611
612static int mx51_ecspi_rx_available(struct spi_imx_data *spi_imx)
613{
614 return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR;
615}
616
617static void mx51_ecspi_reset(struct spi_imx_data *spi_imx)
618{
619 /* drain receive buffer */
620 while (mx51_ecspi_rx_available(spi_imx))
621 readl(spi_imx->base + MXC_CSPIRXDATA);
622}
623
624#define MX31_INTREG_TEEN (1 << 0)
625#define MX31_INTREG_RREN (1 << 3)
626
627#define MX31_CSPICTRL_ENABLE (1 << 0)
628#define MX31_CSPICTRL_MASTER (1 << 1)
629#define MX31_CSPICTRL_XCH (1 << 2)
630#define MX31_CSPICTRL_SMC (1 << 3)
631#define MX31_CSPICTRL_POL (1 << 4)
632#define MX31_CSPICTRL_PHA (1 << 5)
633#define MX31_CSPICTRL_SSCTL (1 << 6)
634#define MX31_CSPICTRL_SSPOL (1 << 7)
635#define MX31_CSPICTRL_BC_SHIFT 8
636#define MX35_CSPICTRL_BL_SHIFT 20
637#define MX31_CSPICTRL_CS_SHIFT 24
638#define MX35_CSPICTRL_CS_SHIFT 12
639#define MX31_CSPICTRL_DR_SHIFT 16
640
641#define MX31_CSPI_DMAREG 0x10
642#define MX31_DMAREG_RH_DEN (1<<4)
643#define MX31_DMAREG_TH_DEN (1<<1)
644
645#define MX31_CSPISTATUS 0x14
646#define MX31_STATUS_RR (1 << 3)
647
648#define MX31_CSPI_TESTREG 0x1C
649#define MX31_TEST_LBC (1 << 14)
650
651/* These functions also work for the i.MX35, but be aware that
652 * the i.MX35 has a slightly different register layout for bits
653 * we do not use here.
654 */
655static void mx31_intctrl(struct spi_imx_data *spi_imx, int enable)
656{
657 unsigned int val = 0;
658
659 if (enable & MXC_INT_TE)
660 val |= MX31_INTREG_TEEN;
661 if (enable & MXC_INT_RR)
662 val |= MX31_INTREG_RREN;
663
664 writel(val, spi_imx->base + MXC_CSPIINT);
665}
666
667static void mx31_trigger(struct spi_imx_data *spi_imx)
668{
669 unsigned int reg;
670
671 reg = readl(spi_imx->base + MXC_CSPICTRL);
672 reg |= MX31_CSPICTRL_XCH;
673 writel(reg, spi_imx->base + MXC_CSPICTRL);
674}
675
676static int mx31_config(struct spi_device *spi)
677{
678 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
679 unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
680 unsigned int clk;
681
682 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->speed_hz, &clk) <<
683 MX31_CSPICTRL_DR_SHIFT;
684 spi_imx->spi_bus_clk = clk;
685
686 if (is_imx35_cspi(spi_imx)) {
687 reg |= (spi_imx->bits_per_word - 1) << MX35_CSPICTRL_BL_SHIFT;
688 reg |= MX31_CSPICTRL_SSCTL;
689 } else {
690 reg |= (spi_imx->bits_per_word - 1) << MX31_CSPICTRL_BC_SHIFT;
691 }
692
693 if (spi->mode & SPI_CPHA)
694 reg |= MX31_CSPICTRL_PHA;
695 if (spi->mode & SPI_CPOL)
696 reg |= MX31_CSPICTRL_POL;
697 if (spi->mode & SPI_CS_HIGH)
698 reg |= MX31_CSPICTRL_SSPOL;
699 if (!gpio_is_valid(spi->cs_gpio))
700 reg |= (spi->chip_select) <<
701 (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT :
702 MX31_CSPICTRL_CS_SHIFT);
703
704 if (spi_imx->usedma)
705 reg |= MX31_CSPICTRL_SMC;
706
707 writel(reg, spi_imx->base + MXC_CSPICTRL);
708
709 reg = readl(spi_imx->base + MX31_CSPI_TESTREG);
710 if (spi->mode & SPI_LOOP)
711 reg |= MX31_TEST_LBC;
712 else
713 reg &= ~MX31_TEST_LBC;
714 writel(reg, spi_imx->base + MX31_CSPI_TESTREG);
715
716 if (spi_imx->usedma) {
717 /* configure DMA requests when RXFIFO is half full and
718 when TXFIFO is half empty */
719 writel(MX31_DMAREG_RH_DEN | MX31_DMAREG_TH_DEN,
720 spi_imx->base + MX31_CSPI_DMAREG);
721 }
722
723 return 0;
724}
725
726static int mx31_rx_available(struct spi_imx_data *spi_imx)
727{
728 return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR;
729}
730
731static void mx31_reset(struct spi_imx_data *spi_imx)
732{
733 /* drain receive buffer */
734 while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR)
735 readl(spi_imx->base + MXC_CSPIRXDATA);
736}
737
738#define MX21_INTREG_RR (1 << 4)
739#define MX21_INTREG_TEEN (1 << 9)
740#define MX21_INTREG_RREN (1 << 13)
741
742#define MX21_CSPICTRL_POL (1 << 5)
743#define MX21_CSPICTRL_PHA (1 << 6)
744#define MX21_CSPICTRL_SSPOL (1 << 8)
745#define MX21_CSPICTRL_XCH (1 << 9)
746#define MX21_CSPICTRL_ENABLE (1 << 10)
747#define MX21_CSPICTRL_MASTER (1 << 11)
748#define MX21_CSPICTRL_DR_SHIFT 14
749#define MX21_CSPICTRL_CS_SHIFT 19
750
751static void mx21_intctrl(struct spi_imx_data *spi_imx, int enable)
752{
753 unsigned int val = 0;
754
755 if (enable & MXC_INT_TE)
756 val |= MX21_INTREG_TEEN;
757 if (enable & MXC_INT_RR)
758 val |= MX21_INTREG_RREN;
759
760 writel(val, spi_imx->base + MXC_CSPIINT);
761}
762
763static void mx21_trigger(struct spi_imx_data *spi_imx)
764{
765 unsigned int reg;
766
767 reg = readl(spi_imx->base + MXC_CSPICTRL);
768 reg |= MX21_CSPICTRL_XCH;
769 writel(reg, spi_imx->base + MXC_CSPICTRL);
770}
771
772static int mx21_config(struct spi_device *spi)
773{
774 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
775 unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
776 unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
777 unsigned int clk;
778
779 reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, spi_imx->speed_hz, max, &clk)
780 << MX21_CSPICTRL_DR_SHIFT;
781 spi_imx->spi_bus_clk = clk;
782
783 reg |= spi_imx->bits_per_word - 1;
784
785 if (spi->mode & SPI_CPHA)
786 reg |= MX21_CSPICTRL_PHA;
787 if (spi->mode & SPI_CPOL)
788 reg |= MX21_CSPICTRL_POL;
789 if (spi->mode & SPI_CS_HIGH)
790 reg |= MX21_CSPICTRL_SSPOL;
791 if (!gpio_is_valid(spi->cs_gpio))
792 reg |= spi->chip_select << MX21_CSPICTRL_CS_SHIFT;
793
794 writel(reg, spi_imx->base + MXC_CSPICTRL);
795
796 return 0;
797}
798
799static int mx21_rx_available(struct spi_imx_data *spi_imx)
800{
801 return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR;
802}
803
804static void mx21_reset(struct spi_imx_data *spi_imx)
805{
806 writel(1, spi_imx->base + MXC_RESET);
807}
808
809#define MX1_INTREG_RR (1 << 3)
810#define MX1_INTREG_TEEN (1 << 8)
811#define MX1_INTREG_RREN (1 << 11)
812
813#define MX1_CSPICTRL_POL (1 << 4)
814#define MX1_CSPICTRL_PHA (1 << 5)
815#define MX1_CSPICTRL_XCH (1 << 8)
816#define MX1_CSPICTRL_ENABLE (1 << 9)
817#define MX1_CSPICTRL_MASTER (1 << 10)
818#define MX1_CSPICTRL_DR_SHIFT 13
819
820static void mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
821{
822 unsigned int val = 0;
823
824 if (enable & MXC_INT_TE)
825 val |= MX1_INTREG_TEEN;
826 if (enable & MXC_INT_RR)
827 val |= MX1_INTREG_RREN;
828
829 writel(val, spi_imx->base + MXC_CSPIINT);
830}
831
832static void mx1_trigger(struct spi_imx_data *spi_imx)
833{
834 unsigned int reg;
835
836 reg = readl(spi_imx->base + MXC_CSPICTRL);
837 reg |= MX1_CSPICTRL_XCH;
838 writel(reg, spi_imx->base + MXC_CSPICTRL);
839}
840
841static int mx1_config(struct spi_device *spi)
842{
843 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
844 unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;
845 unsigned int clk;
846
847 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->speed_hz, &clk) <<
848 MX1_CSPICTRL_DR_SHIFT;
849 spi_imx->spi_bus_clk = clk;
850
851 reg |= spi_imx->bits_per_word - 1;
852
853 if (spi->mode & SPI_CPHA)
854 reg |= MX1_CSPICTRL_PHA;
855 if (spi->mode & SPI_CPOL)
856 reg |= MX1_CSPICTRL_POL;
857
858 writel(reg, spi_imx->base + MXC_CSPICTRL);
859
860 return 0;
861}
862
863static int mx1_rx_available(struct spi_imx_data *spi_imx)
864{
865 return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR;
866}
867
868static void mx1_reset(struct spi_imx_data *spi_imx)
869{
870 writel(1, spi_imx->base + MXC_RESET);
871}
872
873static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
874 .intctrl = mx1_intctrl,
875 .config = mx1_config,
876 .trigger = mx1_trigger,
877 .rx_available = mx1_rx_available,
878 .reset = mx1_reset,
879 .fifo_size = 8,
880 .has_dmamode = false,
881 .dynamic_burst = false,
882 .has_slavemode = false,
883 .devtype = IMX1_CSPI,
884};
885
886static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
887 .intctrl = mx21_intctrl,
888 .config = mx21_config,
889 .trigger = mx21_trigger,
890 .rx_available = mx21_rx_available,
891 .reset = mx21_reset,
892 .fifo_size = 8,
893 .has_dmamode = false,
894 .dynamic_burst = false,
895 .has_slavemode = false,
896 .devtype = IMX21_CSPI,
897};
898
899static struct spi_imx_devtype_data imx27_cspi_devtype_data = {
900 /* i.mx27 cspi shares the functions with i.mx21 one */
901 .intctrl = mx21_intctrl,
902 .config = mx21_config,
903 .trigger = mx21_trigger,
904 .rx_available = mx21_rx_available,
905 .reset = mx21_reset,
906 .fifo_size = 8,
907 .has_dmamode = false,
908 .dynamic_burst = false,
909 .has_slavemode = false,
910 .devtype = IMX27_CSPI,
911};
912
913static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
914 .intctrl = mx31_intctrl,
915 .config = mx31_config,
916 .trigger = mx31_trigger,
917 .rx_available = mx31_rx_available,
918 .reset = mx31_reset,
919 .fifo_size = 8,
920 .has_dmamode = false,
921 .dynamic_burst = false,
922 .has_slavemode = false,
923 .devtype = IMX31_CSPI,
924};
925
926static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
927 /* i.mx35 and later cspi shares the functions with i.mx31 one */
928 .intctrl = mx31_intctrl,
929 .config = mx31_config,
930 .trigger = mx31_trigger,
931 .rx_available = mx31_rx_available,
932 .reset = mx31_reset,
933 .fifo_size = 8,
934 .has_dmamode = true,
935 .dynamic_burst = false,
936 .has_slavemode = false,
937 .devtype = IMX35_CSPI,
938};
939
940static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
941 .intctrl = mx51_ecspi_intctrl,
942 .config = mx51_ecspi_config,
943 .trigger = mx51_ecspi_trigger,
944 .rx_available = mx51_ecspi_rx_available,
945 .reset = mx51_ecspi_reset,
946 .fifo_size = 64,
947 .has_dmamode = true,
948 .dynamic_burst = true,
949 .has_slavemode = true,
950 .disable = mx51_ecspi_disable,
951 .devtype = IMX51_ECSPI,
952};
953
954static struct spi_imx_devtype_data imx53_ecspi_devtype_data = {
955 .intctrl = mx51_ecspi_intctrl,
956 .config = mx51_ecspi_config,
957 .trigger = mx51_ecspi_trigger,
958 .rx_available = mx51_ecspi_rx_available,
959 .reset = mx51_ecspi_reset,
960 .fifo_size = 64,
961 .has_dmamode = true,
962 .has_slavemode = true,
963 .disable = mx51_ecspi_disable,
964 .devtype = IMX53_ECSPI,
965};
966
967static const struct platform_device_id spi_imx_devtype[] = {
968 {
969 .name = "imx1-cspi",
970 .driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data,
971 }, {
972 .name = "imx21-cspi",
973 .driver_data = (kernel_ulong_t) &imx21_cspi_devtype_data,
974 }, {
975 .name = "imx27-cspi",
976 .driver_data = (kernel_ulong_t) &imx27_cspi_devtype_data,
977 }, {
978 .name = "imx31-cspi",
979 .driver_data = (kernel_ulong_t) &imx31_cspi_devtype_data,
980 }, {
981 .name = "imx35-cspi",
982 .driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data,
983 }, {
984 .name = "imx51-ecspi",
985 .driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data,
986 }, {
987 .name = "imx53-ecspi",
988 .driver_data = (kernel_ulong_t) &imx53_ecspi_devtype_data,
989 }, {
990 /* sentinel */
991 }
992};
993
994static const struct of_device_id spi_imx_dt_ids[] = {
995 { .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
996 { .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
997 { .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
998 { .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
999 { .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
1000 { .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
1001 { .compatible = "fsl,imx53-ecspi", .data = &imx53_ecspi_devtype_data, },
1002 { /* sentinel */ }
1003};
1004MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);
1005
1006static void spi_imx_chipselect(struct spi_device *spi, int is_active)
1007{
1008 int active = is_active != BITBANG_CS_INACTIVE;
1009 int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH);
1010
1011 if (spi->mode & SPI_NO_CS)
1012 return;
1013
1014 if (!gpio_is_valid(spi->cs_gpio))
1015 return;
1016
1017 gpio_set_value(spi->cs_gpio, dev_is_lowactive ^ active);
1018}
1019
1020static void spi_imx_push(struct spi_imx_data *spi_imx)
1021{
1022 while (spi_imx->txfifo < spi_imx->devtype_data->fifo_size) {
1023 if (!spi_imx->count)
1024 break;
1025 if (spi_imx->txfifo && (spi_imx->count == spi_imx->remainder))
1026 break;
1027 spi_imx->tx(spi_imx);
1028 spi_imx->txfifo++;
1029 }
1030
1031 if (!spi_imx->slave_mode)
1032 spi_imx->devtype_data->trigger(spi_imx);
1033}
1034
1035static irqreturn_t spi_imx_isr(int irq, void *dev_id)
1036{
1037 struct spi_imx_data *spi_imx = dev_id;
1038
1039 while (spi_imx->txfifo &&
1040 spi_imx->devtype_data->rx_available(spi_imx)) {
1041 spi_imx->rx(spi_imx);
1042 spi_imx->txfifo--;
1043 }
1044
1045 if (spi_imx->count) {
1046 spi_imx_push(spi_imx);
1047 return IRQ_HANDLED;
1048 }
1049
1050 if (spi_imx->txfifo) {
1051 /* No data left to push, but still waiting for rx data,
1052 * enable receive data available interrupt.
1053 */
1054 spi_imx->devtype_data->intctrl(
1055 spi_imx, MXC_INT_RR);
1056 return IRQ_HANDLED;
1057 }
1058
1059 spi_imx->devtype_data->intctrl(spi_imx, 0);
1060 complete(&spi_imx->xfer_done);
1061
1062 return IRQ_HANDLED;
1063}
1064
1065static int spi_imx_dma_configure(struct spi_master *master)
1066{
1067 int ret;
1068 enum dma_slave_buswidth buswidth;
1069 struct dma_slave_config rx = {}, tx = {};
1070 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1071
1072 switch (spi_imx_bytes_per_word(spi_imx->bits_per_word)) {
1073 case 4:
1074 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
1075 break;
1076 case 2:
1077 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
1078 break;
1079 case 1:
1080 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
1081 break;
1082 default:
1083 return -EINVAL;
1084 }
1085
1086 tx.direction = DMA_MEM_TO_DEV;
1087 tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA;
1088 tx.dst_addr_width = buswidth;
1089 tx.dst_maxburst = spi_imx->wml;
1090 ret = dmaengine_slave_config(master->dma_tx, &tx);
1091 if (ret) {
1092 dev_err(spi_imx->dev, "TX dma configuration failed with %d\n", ret);
1093 return ret;
1094 }
1095
1096 rx.direction = DMA_DEV_TO_MEM;
1097 rx.src_addr = spi_imx->base_phys + MXC_CSPIRXDATA;
1098 rx.src_addr_width = buswidth;
1099 rx.src_maxburst = spi_imx->wml;
1100 ret = dmaengine_slave_config(master->dma_rx, &rx);
1101 if (ret) {
1102 dev_err(spi_imx->dev, "RX dma configuration failed with %d\n", ret);
1103 return ret;
1104 }
1105
1106 return 0;
1107}
1108
1109static int spi_imx_setupxfer(struct spi_device *spi,
1110 struct spi_transfer *t)
1111{
1112 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1113 int ret;
1114
1115 if (!t)
1116 return 0;
1117
1118 spi_imx->bits_per_word = t->bits_per_word;
1119 spi_imx->speed_hz = t->speed_hz;
1120
1121 /* Initialize the functions for transfer */
1122 if (spi_imx->devtype_data->dynamic_burst && !spi_imx->slave_mode) {
1123 u32 mask;
1124
1125 spi_imx->dynamic_burst = 0;
1126 spi_imx->remainder = 0;
1127 spi_imx->read_u32 = 1;
1128
1129 mask = (1 << spi_imx->bits_per_word) - 1;
1130 spi_imx->rx = spi_imx_buf_rx_swap;
1131 spi_imx->tx = spi_imx_buf_tx_swap;
1132 spi_imx->dynamic_burst = 1;
1133 spi_imx->remainder = t->len;
1134
1135 if (spi_imx->bits_per_word <= 8)
1136 spi_imx->word_mask = mask << 24 | mask << 16
1137 | mask << 8 | mask;
1138 else if (spi_imx->bits_per_word <= 16)
1139 spi_imx->word_mask = mask << 16 | mask;
1140 else
1141 spi_imx->word_mask = mask;
1142 } else {
1143 if (spi_imx->bits_per_word <= 8) {
1144 spi_imx->rx = spi_imx_buf_rx_u8;
1145 spi_imx->tx = spi_imx_buf_tx_u8;
1146 } else if (spi_imx->bits_per_word <= 16) {
1147 spi_imx->rx = spi_imx_buf_rx_u16;
1148 spi_imx->tx = spi_imx_buf_tx_u16;
1149 } else {
1150 spi_imx->rx = spi_imx_buf_rx_u32;
1151 spi_imx->tx = spi_imx_buf_tx_u32;
1152 }
1153 }
1154
1155 if (spi_imx_can_dma(spi_imx->bitbang.master, spi, t))
1156 spi_imx->usedma = 1;
1157 else
1158 spi_imx->usedma = 0;
1159
1160 if (spi_imx->usedma) {
1161 ret = spi_imx_dma_configure(spi->master);
1162 if (ret)
1163 return ret;
1164 }
1165
1166 if (is_imx53_ecspi(spi_imx) && spi_imx->slave_mode) {
1167 spi_imx->rx = mx53_ecspi_rx_slave;
1168 spi_imx->tx = mx53_ecspi_tx_slave;
1169 spi_imx->slave_burst = t->len;
1170 }
1171
1172 spi_imx->devtype_data->config(spi);
1173
1174 return 0;
1175}
1176
1177static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
1178{
1179 struct spi_master *master = spi_imx->bitbang.master;
1180
1181 if (master->dma_rx) {
1182 dma_release_channel(master->dma_rx);
1183 master->dma_rx = NULL;
1184 }
1185
1186 if (master->dma_tx) {
1187 dma_release_channel(master->dma_tx);
1188 master->dma_tx = NULL;
1189 }
1190}
1191
1192static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
1193 struct spi_master *master)
1194{
1195 int ret;
1196
1197 /* use pio mode for i.mx6dl chip TKT238285 */
1198 if (of_machine_is_compatible("fsl,imx6dl"))
1199 return 0;
1200
1201 spi_imx->wml = spi_imx->devtype_data->fifo_size / 2;
1202
1203 /* Prepare for TX DMA: */
1204 master->dma_tx = dma_request_slave_channel_reason(dev, "tx");
1205 if (IS_ERR(master->dma_tx)) {
1206 ret = PTR_ERR(master->dma_tx);
1207 dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret);
1208 master->dma_tx = NULL;
1209 goto err;
1210 }
1211
1212 /* Prepare for RX : */
1213 master->dma_rx = dma_request_slave_channel_reason(dev, "rx");
1214 if (IS_ERR(master->dma_rx)) {
1215 ret = PTR_ERR(master->dma_rx);
1216 dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret);
1217 master->dma_rx = NULL;
1218 goto err;
1219 }
1220
1221 init_completion(&spi_imx->dma_rx_completion);
1222 init_completion(&spi_imx->dma_tx_completion);
1223 master->can_dma = spi_imx_can_dma;
1224 master->max_dma_len = MAX_SDMA_BD_BYTES;
1225 spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX |
1226 SPI_MASTER_MUST_TX;
1227
1228 return 0;
1229err:
1230 spi_imx_sdma_exit(spi_imx);
1231 return ret;
1232}
1233
1234static void spi_imx_dma_rx_callback(void *cookie)
1235{
1236 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
1237
1238 complete(&spi_imx->dma_rx_completion);
1239}
1240
1241static void spi_imx_dma_tx_callback(void *cookie)
1242{
1243 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
1244
1245 complete(&spi_imx->dma_tx_completion);
1246}
1247
1248static int spi_imx_calculate_timeout(struct spi_imx_data *spi_imx, int size)
1249{
1250 unsigned long timeout = 0;
1251
1252 /* Time with actual data transfer and CS change delay related to HW */
1253 timeout = (8 + 4) * size / spi_imx->spi_bus_clk;
1254
1255 /* Add extra second for scheduler related activities */
1256 timeout += 1;
1257
1258 /* Double calculated timeout */
1259 return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC);
1260}
1261
1262static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
1263 struct spi_transfer *transfer)
1264{
1265 struct dma_async_tx_descriptor *desc_tx, *desc_rx;
1266 unsigned long transfer_timeout;
1267 unsigned long timeout;
1268 struct spi_master *master = spi_imx->bitbang.master;
1269 struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
1270
1271 /*
1272 * The TX DMA setup starts the transfer, so make sure RX is configured
1273 * before TX.
1274 */
1275 desc_rx = dmaengine_prep_slave_sg(master->dma_rx,
1276 rx->sgl, rx->nents, DMA_DEV_TO_MEM,
1277 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1278 if (!desc_rx)
1279 return -EINVAL;
1280
1281 desc_rx->callback = spi_imx_dma_rx_callback;
1282 desc_rx->callback_param = (void *)spi_imx;
1283 dmaengine_submit(desc_rx);
1284 reinit_completion(&spi_imx->dma_rx_completion);
1285 dma_async_issue_pending(master->dma_rx);
1286
1287 desc_tx = dmaengine_prep_slave_sg(master->dma_tx,
1288 tx->sgl, tx->nents, DMA_MEM_TO_DEV,
1289 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1290 if (!desc_tx) {
1291 dmaengine_terminate_all(master->dma_tx);
1292 return -EINVAL;
1293 }
1294
1295 desc_tx->callback = spi_imx_dma_tx_callback;
1296 desc_tx->callback_param = (void *)spi_imx;
1297 dmaengine_submit(desc_tx);
1298 reinit_completion(&spi_imx->dma_tx_completion);
1299 dma_async_issue_pending(master->dma_tx);
1300
1301 transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1302
1303 /* Wait SDMA to finish the data transfer.*/
1304 timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
1305 transfer_timeout);
1306 if (!timeout) {
1307 dev_err(spi_imx->dev, "I/O Error in DMA TX\n");
1308 dmaengine_terminate_all(master->dma_tx);
1309 dmaengine_terminate_all(master->dma_rx);
1310 return -ETIMEDOUT;
1311 }
1312
1313 timeout = wait_for_completion_timeout(&spi_imx->dma_rx_completion,
1314 transfer_timeout);
1315 if (!timeout) {
1316 dev_err(&master->dev, "I/O Error in DMA RX\n");
1317 spi_imx->devtype_data->reset(spi_imx);
1318 dmaengine_terminate_all(master->dma_rx);
1319 return -ETIMEDOUT;
1320 }
1321
1322 return transfer->len;
1323}
1324
1325static int spi_imx_pio_transfer(struct spi_device *spi,
1326 struct spi_transfer *transfer)
1327{
1328 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1329 unsigned long transfer_timeout;
1330 unsigned long timeout;
1331
1332 spi_imx->tx_buf = transfer->tx_buf;
1333 spi_imx->rx_buf = transfer->rx_buf;
1334 spi_imx->count = transfer->len;
1335 spi_imx->txfifo = 0;
1336
1337 reinit_completion(&spi_imx->xfer_done);
1338
1339 spi_imx_push(spi_imx);
1340
1341 spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE);
1342
1343 transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1344
1345 timeout = wait_for_completion_timeout(&spi_imx->xfer_done,
1346 transfer_timeout);
1347 if (!timeout) {
1348 dev_err(&spi->dev, "I/O Error in PIO\n");
1349 spi_imx->devtype_data->reset(spi_imx);
1350 return -ETIMEDOUT;
1351 }
1352
1353 return transfer->len;
1354}
1355
1356static int spi_imx_pio_transfer_slave(struct spi_device *spi,
1357 struct spi_transfer *transfer)
1358{
1359 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1360 int ret = transfer->len;
1361
1362 if (is_imx53_ecspi(spi_imx) &&
1363 transfer->len > MX53_MAX_TRANSFER_BYTES) {
1364 dev_err(&spi->dev, "Transaction too big, max size is %d bytes\n",
1365 MX53_MAX_TRANSFER_BYTES);
1366 return -EMSGSIZE;
1367 }
1368
1369 spi_imx->tx_buf = transfer->tx_buf;
1370 spi_imx->rx_buf = transfer->rx_buf;
1371 spi_imx->count = transfer->len;
1372 spi_imx->txfifo = 0;
1373
1374 reinit_completion(&spi_imx->xfer_done);
1375 spi_imx->slave_aborted = false;
1376
1377 spi_imx_push(spi_imx);
1378
1379 spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE | MXC_INT_RDR);
1380
1381 if (wait_for_completion_interruptible(&spi_imx->xfer_done) ||
1382 spi_imx->slave_aborted) {
1383 dev_dbg(&spi->dev, "interrupted\n");
1384 ret = -EINTR;
1385 }
1386
1387 /* ecspi has a HW issue when works in Slave mode,
1388 * after 64 words writtern to TXFIFO, even TXFIFO becomes empty,
1389 * ECSPI_TXDATA keeps shift out the last word data,
1390 * so we have to disable ECSPI when in slave mode after the
1391 * transfer completes
1392 */
1393 if (spi_imx->devtype_data->disable)
1394 spi_imx->devtype_data->disable(spi_imx);
1395
1396 return ret;
1397}
1398
1399static int spi_imx_transfer(struct spi_device *spi,
1400 struct spi_transfer *transfer)
1401{
1402 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1403
1404 /* flush rxfifo before transfer */
1405 while (spi_imx->devtype_data->rx_available(spi_imx))
1406 spi_imx->rx(spi_imx);
1407
1408 if (spi_imx->slave_mode)
1409 return spi_imx_pio_transfer_slave(spi, transfer);
1410
1411 if (spi_imx->usedma)
1412 return spi_imx_dma_transfer(spi_imx, transfer);
1413 else
1414 return spi_imx_pio_transfer(spi, transfer);
1415}
1416
1417static int spi_imx_setup(struct spi_device *spi)
1418{
1419 dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__,
1420 spi->mode, spi->bits_per_word, spi->max_speed_hz);
1421
1422 if (spi->mode & SPI_NO_CS)
1423 return 0;
1424
1425 if (gpio_is_valid(spi->cs_gpio))
1426 gpio_direction_output(spi->cs_gpio,
1427 spi->mode & SPI_CS_HIGH ? 0 : 1);
1428
1429 spi_imx_chipselect(spi, BITBANG_CS_INACTIVE);
1430
1431 return 0;
1432}
1433
1434static void spi_imx_cleanup(struct spi_device *spi)
1435{
1436}
1437
1438static int
1439spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg)
1440{
1441 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1442 int ret;
1443
1444 ret = clk_enable(spi_imx->clk_per);
1445 if (ret)
1446 return ret;
1447
1448 ret = clk_enable(spi_imx->clk_ipg);
1449 if (ret) {
1450 clk_disable(spi_imx->clk_per);
1451 return ret;
1452 }
1453
1454 return 0;
1455}
1456
1457static int
1458spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg)
1459{
1460 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1461
1462 clk_disable(spi_imx->clk_ipg);
1463 clk_disable(spi_imx->clk_per);
1464 return 0;
1465}
1466
1467static int spi_imx_slave_abort(struct spi_master *master)
1468{
1469 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1470
1471 spi_imx->slave_aborted = true;
1472 complete(&spi_imx->xfer_done);
1473
1474 return 0;
1475}
1476
1477static int spi_imx_probe(struct platform_device *pdev)
1478{
1479 struct device_node *np = pdev->dev.of_node;
1480 const struct of_device_id *of_id =
1481 of_match_device(spi_imx_dt_ids, &pdev->dev);
1482 struct spi_imx_master *mxc_platform_info =
1483 dev_get_platdata(&pdev->dev);
1484 struct spi_master *master;
1485 struct spi_imx_data *spi_imx;
1486 struct resource *res;
1487 int i, ret, irq, spi_drctl;
1488 const struct spi_imx_devtype_data *devtype_data = of_id ? of_id->data :
1489 (struct spi_imx_devtype_data *)pdev->id_entry->driver_data;
1490 bool slave_mode;
1491
1492 if (!np && !mxc_platform_info) {
1493 dev_err(&pdev->dev, "can't get the platform data\n");
1494 return -EINVAL;
1495 }
1496
1497 slave_mode = devtype_data->has_slavemode &&
1498 of_property_read_bool(np, "spi-slave");
1499 if (slave_mode)
1500 master = spi_alloc_slave(&pdev->dev,
1501 sizeof(struct spi_imx_data));
1502 else
1503 master = spi_alloc_master(&pdev->dev,
1504 sizeof(struct spi_imx_data));
1505 if (!master)
1506 return -ENOMEM;
1507
1508 ret = of_property_read_u32(np, "fsl,spi-rdy-drctl", &spi_drctl);
1509 if ((ret < 0) || (spi_drctl >= 0x3)) {
1510 /* '11' is reserved */
1511 spi_drctl = 0;
1512 }
1513
1514 platform_set_drvdata(pdev, master);
1515
1516 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
1517 master->bus_num = np ? -1 : pdev->id;
1518
1519 spi_imx = spi_master_get_devdata(master);
1520 spi_imx->bitbang.master = master;
1521 spi_imx->dev = &pdev->dev;
1522 spi_imx->slave_mode = slave_mode;
1523
1524 spi_imx->devtype_data = devtype_data;
1525
1526 /* Get number of chip selects, either platform data or OF */
1527 if (mxc_platform_info) {
1528 master->num_chipselect = mxc_platform_info->num_chipselect;
1529 if (mxc_platform_info->chipselect) {
1530 master->cs_gpios = devm_kzalloc(&master->dev,
1531 sizeof(int) * master->num_chipselect, GFP_KERNEL);
1532 if (!master->cs_gpios)
1533 return -ENOMEM;
1534
1535 for (i = 0; i < master->num_chipselect; i++)
1536 master->cs_gpios[i] = mxc_platform_info->chipselect[i];
1537 }
1538 } else {
1539 u32 num_cs;
1540
1541 if (!of_property_read_u32(np, "num-cs", &num_cs))
1542 master->num_chipselect = num_cs;
1543 /* If not preset, default value of 1 is used */
1544 }
1545
1546 spi_imx->bitbang.chipselect = spi_imx_chipselect;
1547 spi_imx->bitbang.setup_transfer = spi_imx_setupxfer;
1548 spi_imx->bitbang.txrx_bufs = spi_imx_transfer;
1549 spi_imx->bitbang.master->setup = spi_imx_setup;
1550 spi_imx->bitbang.master->cleanup = spi_imx_cleanup;
1551 spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message;
1552 spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message;
1553 spi_imx->bitbang.master->slave_abort = spi_imx_slave_abort;
1554 spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \
1555 | SPI_NO_CS;
1556 if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) ||
1557 is_imx53_ecspi(spi_imx))
1558 spi_imx->bitbang.master->mode_bits |= SPI_LOOP | SPI_READY;
1559
1560 spi_imx->spi_drctl = spi_drctl;
1561
1562 init_completion(&spi_imx->xfer_done);
1563
1564 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1565 spi_imx->base = devm_ioremap_resource(&pdev->dev, res);
1566 if (IS_ERR(spi_imx->base)) {
1567 ret = PTR_ERR(spi_imx->base);
1568 goto out_master_put;
1569 }
1570 spi_imx->base_phys = res->start;
1571
1572 irq = platform_get_irq(pdev, 0);
1573 if (irq < 0) {
1574 ret = irq;
1575 goto out_master_put;
1576 }
1577
1578 ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0,
1579 dev_name(&pdev->dev), spi_imx);
1580 if (ret) {
1581 dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
1582 goto out_master_put;
1583 }
1584
1585 spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1586 if (IS_ERR(spi_imx->clk_ipg)) {
1587 ret = PTR_ERR(spi_imx->clk_ipg);
1588 goto out_master_put;
1589 }
1590
1591 spi_imx->clk_per = devm_clk_get(&pdev->dev, "per");
1592 if (IS_ERR(spi_imx->clk_per)) {
1593 ret = PTR_ERR(spi_imx->clk_per);
1594 goto out_master_put;
1595 }
1596
1597 ret = clk_prepare_enable(spi_imx->clk_per);
1598 if (ret)
1599 goto out_master_put;
1600
1601 ret = clk_prepare_enable(spi_imx->clk_ipg);
1602 if (ret)
1603 goto out_put_per;
1604
1605 spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
1606 /*
1607 * Only validated on i.mx35 and i.mx6 now, can remove the constraint
1608 * if validated on other chips.
1609 */
1610 if (spi_imx->devtype_data->has_dmamode) {
1611 ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master);
1612 if (ret == -EPROBE_DEFER)
1613 goto out_clk_put;
1614
1615 if (ret < 0)
1616 dev_err(&pdev->dev, "dma setup error %d, use pio\n",
1617 ret);
1618 }
1619
1620 spi_imx->devtype_data->reset(spi_imx);
1621
1622 spi_imx->devtype_data->intctrl(spi_imx, 0);
1623
1624 master->dev.of_node = pdev->dev.of_node;
1625 ret = spi_bitbang_start(&spi_imx->bitbang);
1626 if (ret) {
1627 dev_err(&pdev->dev, "bitbang start failed with %d\n", ret);
1628 goto out_clk_put;
1629 }
1630
1631 /* Request GPIO CS lines, if any */
1632 if (!spi_imx->slave_mode && master->cs_gpios) {
1633 for (i = 0; i < master->num_chipselect; i++) {
1634 if (!gpio_is_valid(master->cs_gpios[i]))
1635 continue;
1636
1637 ret = devm_gpio_request(&pdev->dev,
1638 master->cs_gpios[i],
1639 DRIVER_NAME);
1640 if (ret) {
1641 dev_err(&pdev->dev, "Can't get CS GPIO %i\n",
1642 master->cs_gpios[i]);
1643 goto out_spi_bitbang;
1644 }
1645 }
1646 }
1647
1648 dev_info(&pdev->dev, "probed\n");
1649
1650 clk_disable(spi_imx->clk_ipg);
1651 clk_disable(spi_imx->clk_per);
1652 return ret;
1653
1654out_spi_bitbang:
1655 spi_bitbang_stop(&spi_imx->bitbang);
1656out_clk_put:
1657 clk_disable_unprepare(spi_imx->clk_ipg);
1658out_put_per:
1659 clk_disable_unprepare(spi_imx->clk_per);
1660out_master_put:
1661 spi_master_put(master);
1662
1663 return ret;
1664}
1665
1666static int spi_imx_remove(struct platform_device *pdev)
1667{
1668 struct spi_master *master = platform_get_drvdata(pdev);
1669 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1670 int ret;
1671
1672 spi_bitbang_stop(&spi_imx->bitbang);
1673
1674 ret = clk_enable(spi_imx->clk_per);
1675 if (ret)
1676 return ret;
1677
1678 ret = clk_enable(spi_imx->clk_ipg);
1679 if (ret) {
1680 clk_disable(spi_imx->clk_per);
1681 return ret;
1682 }
1683
1684 writel(0, spi_imx->base + MXC_CSPICTRL);
1685 clk_disable_unprepare(spi_imx->clk_ipg);
1686 clk_disable_unprepare(spi_imx->clk_per);
1687 spi_imx_sdma_exit(spi_imx);
1688 spi_master_put(master);
1689
1690 return 0;
1691}
1692
1693static struct platform_driver spi_imx_driver = {
1694 .driver = {
1695 .name = DRIVER_NAME,
1696 .of_match_table = spi_imx_dt_ids,
1697 },
1698 .id_table = spi_imx_devtype,
1699 .probe = spi_imx_probe,
1700 .remove = spi_imx_remove,
1701};
1702module_platform_driver(spi_imx_driver);
1703
1704MODULE_DESCRIPTION("SPI Controller driver");
1705MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1706MODULE_LICENSE("GPL");
1707MODULE_ALIAS("platform:" DRIVER_NAME);