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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/types.h>
22#include <linux/of.h>
23#include <linux/of_device.h>
24#include <linux/property.h>
25
26#include <linux/dma/imx-dma.h>
27
28#define DRIVER_NAME "spi_imx"
29
30static bool use_dma = true;
31module_param(use_dma, bool, 0644);
32MODULE_PARM_DESC(use_dma, "Enable usage of DMA when available (default)");
33
34/* define polling limits */
35static unsigned int polling_limit_us = 30;
36module_param(polling_limit_us, uint, 0664);
37MODULE_PARM_DESC(polling_limit_us,
38 "time in us to run a transfer in polling mode\n");
39
40#define MXC_RPM_TIMEOUT 2000 /* 2000ms */
41
42#define MXC_CSPIRXDATA 0x00
43#define MXC_CSPITXDATA 0x04
44#define MXC_CSPICTRL 0x08
45#define MXC_CSPIINT 0x0c
46#define MXC_RESET 0x1c
47
48/* generic defines to abstract from the different register layouts */
49#define MXC_INT_RR (1 << 0) /* Receive data ready interrupt */
50#define MXC_INT_TE (1 << 1) /* Transmit FIFO empty interrupt */
51#define MXC_INT_RDR BIT(4) /* Receive date threshold interrupt */
52
53/* The maximum bytes that a sdma BD can transfer. */
54#define MAX_SDMA_BD_BYTES (1 << 15)
55#define MX51_ECSPI_CTRL_MAX_BURST 512
56/* The maximum bytes that IMX53_ECSPI can transfer in slave mode.*/
57#define MX53_MAX_TRANSFER_BYTES 512
58
59enum spi_imx_devtype {
60 IMX1_CSPI,
61 IMX21_CSPI,
62 IMX27_CSPI,
63 IMX31_CSPI,
64 IMX35_CSPI, /* CSPI on all i.mx except above */
65 IMX51_ECSPI, /* ECSPI on i.mx51 */
66 IMX53_ECSPI, /* ECSPI on i.mx53 and later */
67};
68
69struct spi_imx_data;
70
71struct spi_imx_devtype_data {
72 void (*intctrl)(struct spi_imx_data *spi_imx, int enable);
73 int (*prepare_message)(struct spi_imx_data *spi_imx, struct spi_message *msg);
74 int (*prepare_transfer)(struct spi_imx_data *spi_imx, struct spi_device *spi);
75 void (*trigger)(struct spi_imx_data *spi_imx);
76 int (*rx_available)(struct spi_imx_data *spi_imx);
77 void (*reset)(struct spi_imx_data *spi_imx);
78 void (*setup_wml)(struct spi_imx_data *spi_imx);
79 void (*disable)(struct spi_imx_data *spi_imx);
80 bool has_dmamode;
81 bool has_slavemode;
82 unsigned int fifo_size;
83 bool dynamic_burst;
84 /*
85 * ERR009165 fixed or not:
86 * https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf
87 */
88 bool tx_glitch_fixed;
89 enum spi_imx_devtype devtype;
90};
91
92struct spi_imx_data {
93 struct spi_controller *controller;
94 struct device *dev;
95
96 struct completion xfer_done;
97 void __iomem *base;
98 unsigned long base_phys;
99
100 struct clk *clk_per;
101 struct clk *clk_ipg;
102 unsigned long spi_clk;
103 unsigned int spi_bus_clk;
104
105 unsigned int bits_per_word;
106 unsigned int spi_drctl;
107
108 unsigned int count, remainder;
109 void (*tx)(struct spi_imx_data *spi_imx);
110 void (*rx)(struct spi_imx_data *spi_imx);
111 void *rx_buf;
112 const void *tx_buf;
113 unsigned int txfifo; /* number of words pushed in tx FIFO */
114 unsigned int dynamic_burst;
115 bool rx_only;
116
117 /* Slave mode */
118 bool slave_mode;
119 bool slave_aborted;
120 unsigned int slave_burst;
121
122 /* DMA */
123 bool usedma;
124 u32 wml;
125 struct completion dma_rx_completion;
126 struct completion dma_tx_completion;
127
128 const struct spi_imx_devtype_data *devtype_data;
129};
130
131static inline int is_imx27_cspi(struct spi_imx_data *d)
132{
133 return d->devtype_data->devtype == IMX27_CSPI;
134}
135
136static inline int is_imx35_cspi(struct spi_imx_data *d)
137{
138 return d->devtype_data->devtype == IMX35_CSPI;
139}
140
141static inline int is_imx51_ecspi(struct spi_imx_data *d)
142{
143 return d->devtype_data->devtype == IMX51_ECSPI;
144}
145
146static inline int is_imx53_ecspi(struct spi_imx_data *d)
147{
148 return d->devtype_data->devtype == IMX53_ECSPI;
149}
150
151#define MXC_SPI_BUF_RX(type) \
152static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx) \
153{ \
154 unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); \
155 \
156 if (spi_imx->rx_buf) { \
157 *(type *)spi_imx->rx_buf = val; \
158 spi_imx->rx_buf += sizeof(type); \
159 } \
160 \
161 spi_imx->remainder -= sizeof(type); \
162}
163
164#define MXC_SPI_BUF_TX(type) \
165static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx) \
166{ \
167 type val = 0; \
168 \
169 if (spi_imx->tx_buf) { \
170 val = *(type *)spi_imx->tx_buf; \
171 spi_imx->tx_buf += sizeof(type); \
172 } \
173 \
174 spi_imx->count -= sizeof(type); \
175 \
176 writel(val, spi_imx->base + MXC_CSPITXDATA); \
177}
178
179MXC_SPI_BUF_RX(u8)
180MXC_SPI_BUF_TX(u8)
181MXC_SPI_BUF_RX(u16)
182MXC_SPI_BUF_TX(u16)
183MXC_SPI_BUF_RX(u32)
184MXC_SPI_BUF_TX(u32)
185
186/* First entry is reserved, second entry is valid only if SDHC_SPIEN is set
187 * (which is currently not the case in this driver)
188 */
189static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192,
190 256, 384, 512, 768, 1024};
191
192/* MX21, MX27 */
193static unsigned int spi_imx_clkdiv_1(unsigned int fin,
194 unsigned int fspi, unsigned int max, unsigned int *fres)
195{
196 int i;
197
198 for (i = 2; i < max; i++)
199 if (fspi * mxc_clkdivs[i] >= fin)
200 break;
201
202 *fres = fin / mxc_clkdivs[i];
203 return i;
204}
205
206/* MX1, MX31, MX35, MX51 CSPI */
207static unsigned int spi_imx_clkdiv_2(unsigned int fin,
208 unsigned int fspi, unsigned int *fres)
209{
210 int i, div = 4;
211
212 for (i = 0; i < 7; i++) {
213 if (fspi * div >= fin)
214 goto out;
215 div <<= 1;
216 }
217
218out:
219 *fres = fin / div;
220 return i;
221}
222
223static int spi_imx_bytes_per_word(const int bits_per_word)
224{
225 if (bits_per_word <= 8)
226 return 1;
227 else if (bits_per_word <= 16)
228 return 2;
229 else
230 return 4;
231}
232
233static bool spi_imx_can_dma(struct spi_controller *controller, struct spi_device *spi,
234 struct spi_transfer *transfer)
235{
236 struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
237
238 if (!use_dma || controller->fallback)
239 return false;
240
241 if (!controller->dma_rx)
242 return false;
243
244 if (spi_imx->slave_mode)
245 return false;
246
247 if (transfer->len < spi_imx->devtype_data->fifo_size)
248 return false;
249
250 spi_imx->dynamic_burst = 0;
251
252 return true;
253}
254
255#define MX51_ECSPI_CTRL 0x08
256#define MX51_ECSPI_CTRL_ENABLE (1 << 0)
257#define MX51_ECSPI_CTRL_XCH (1 << 2)
258#define MX51_ECSPI_CTRL_SMC (1 << 3)
259#define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4)
260#define MX51_ECSPI_CTRL_DRCTL(drctl) ((drctl) << 16)
261#define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8
262#define MX51_ECSPI_CTRL_PREDIV_OFFSET 12
263#define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18)
264#define MX51_ECSPI_CTRL_BL_OFFSET 20
265#define MX51_ECSPI_CTRL_BL_MASK (0xfff << 20)
266
267#define MX51_ECSPI_CONFIG 0x0c
268#define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0))
269#define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs) + 4))
270#define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs) + 8))
271#define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs) + 12))
272#define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs) + 20))
273
274#define MX51_ECSPI_INT 0x10
275#define MX51_ECSPI_INT_TEEN (1 << 0)
276#define MX51_ECSPI_INT_RREN (1 << 3)
277#define MX51_ECSPI_INT_RDREN (1 << 4)
278
279#define MX51_ECSPI_DMA 0x14
280#define MX51_ECSPI_DMA_TX_WML(wml) ((wml) & 0x3f)
281#define MX51_ECSPI_DMA_RX_WML(wml) (((wml) & 0x3f) << 16)
282#define MX51_ECSPI_DMA_RXT_WML(wml) (((wml) & 0x3f) << 24)
283
284#define MX51_ECSPI_DMA_TEDEN (1 << 7)
285#define MX51_ECSPI_DMA_RXDEN (1 << 23)
286#define MX51_ECSPI_DMA_RXTDEN (1 << 31)
287
288#define MX51_ECSPI_STAT 0x18
289#define MX51_ECSPI_STAT_RR (1 << 3)
290
291#define MX51_ECSPI_TESTREG 0x20
292#define MX51_ECSPI_TESTREG_LBC BIT(31)
293
294static void spi_imx_buf_rx_swap_u32(struct spi_imx_data *spi_imx)
295{
296 unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA);
297
298 if (spi_imx->rx_buf) {
299#ifdef __LITTLE_ENDIAN
300 unsigned int bytes_per_word;
301
302 bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
303 if (bytes_per_word == 1)
304 swab32s(&val);
305 else if (bytes_per_word == 2)
306 swahw32s(&val);
307#endif
308 *(u32 *)spi_imx->rx_buf = val;
309 spi_imx->rx_buf += sizeof(u32);
310 }
311
312 spi_imx->remainder -= sizeof(u32);
313}
314
315static void spi_imx_buf_rx_swap(struct spi_imx_data *spi_imx)
316{
317 int unaligned;
318 u32 val;
319
320 unaligned = spi_imx->remainder % 4;
321
322 if (!unaligned) {
323 spi_imx_buf_rx_swap_u32(spi_imx);
324 return;
325 }
326
327 if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) {
328 spi_imx_buf_rx_u16(spi_imx);
329 return;
330 }
331
332 val = readl(spi_imx->base + MXC_CSPIRXDATA);
333
334 while (unaligned--) {
335 if (spi_imx->rx_buf) {
336 *(u8 *)spi_imx->rx_buf = (val >> (8 * unaligned)) & 0xff;
337 spi_imx->rx_buf++;
338 }
339 spi_imx->remainder--;
340 }
341}
342
343static void spi_imx_buf_tx_swap_u32(struct spi_imx_data *spi_imx)
344{
345 u32 val = 0;
346#ifdef __LITTLE_ENDIAN
347 unsigned int bytes_per_word;
348#endif
349
350 if (spi_imx->tx_buf) {
351 val = *(u32 *)spi_imx->tx_buf;
352 spi_imx->tx_buf += sizeof(u32);
353 }
354
355 spi_imx->count -= sizeof(u32);
356#ifdef __LITTLE_ENDIAN
357 bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
358
359 if (bytes_per_word == 1)
360 swab32s(&val);
361 else if (bytes_per_word == 2)
362 swahw32s(&val);
363#endif
364 writel(val, spi_imx->base + MXC_CSPITXDATA);
365}
366
367static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx)
368{
369 int unaligned;
370 u32 val = 0;
371
372 unaligned = spi_imx->count % 4;
373
374 if (!unaligned) {
375 spi_imx_buf_tx_swap_u32(spi_imx);
376 return;
377 }
378
379 if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) {
380 spi_imx_buf_tx_u16(spi_imx);
381 return;
382 }
383
384 while (unaligned--) {
385 if (spi_imx->tx_buf) {
386 val |= *(u8 *)spi_imx->tx_buf << (8 * unaligned);
387 spi_imx->tx_buf++;
388 }
389 spi_imx->count--;
390 }
391
392 writel(val, spi_imx->base + MXC_CSPITXDATA);
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 spi_imx->remainder -= sizeof(u32);
413}
414
415static void mx53_ecspi_tx_slave(struct spi_imx_data *spi_imx)
416{
417 u32 val = 0;
418 int n_bytes = spi_imx->count % sizeof(val);
419
420 if (!n_bytes)
421 n_bytes = sizeof(val);
422
423 if (spi_imx->tx_buf) {
424 memcpy(((u8 *)&val) + sizeof(val) - n_bytes,
425 spi_imx->tx_buf, n_bytes);
426 val = cpu_to_be32(val);
427 spi_imx->tx_buf += n_bytes;
428 }
429
430 spi_imx->count -= n_bytes;
431
432 writel(val, spi_imx->base + MXC_CSPITXDATA);
433}
434
435/* MX51 eCSPI */
436static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx,
437 unsigned int fspi, unsigned int *fres)
438{
439 /*
440 * there are two 4-bit dividers, the pre-divider divides by
441 * $pre, the post-divider by 2^$post
442 */
443 unsigned int pre, post;
444 unsigned int fin = spi_imx->spi_clk;
445
446 fspi = min(fspi, fin);
447
448 post = fls(fin) - fls(fspi);
449 if (fin > fspi << post)
450 post++;
451
452 /* now we have: (fin <= fspi << post) with post being minimal */
453
454 post = max(4U, post) - 4;
455 if (unlikely(post > 0xf)) {
456 dev_err(spi_imx->dev, "cannot set clock freq: %u (base freq: %u)\n",
457 fspi, fin);
458 return 0xff;
459 }
460
461 pre = DIV_ROUND_UP(fin, fspi << post) - 1;
462
463 dev_dbg(spi_imx->dev, "%s: fin: %u, fspi: %u, post: %u, pre: %u\n",
464 __func__, fin, fspi, post, pre);
465
466 /* Resulting frequency for the SCLK line. */
467 *fres = (fin / (pre + 1)) >> post;
468
469 return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) |
470 (post << MX51_ECSPI_CTRL_POSTDIV_OFFSET);
471}
472
473static void mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
474{
475 unsigned int val = 0;
476
477 if (enable & MXC_INT_TE)
478 val |= MX51_ECSPI_INT_TEEN;
479
480 if (enable & MXC_INT_RR)
481 val |= MX51_ECSPI_INT_RREN;
482
483 if (enable & MXC_INT_RDR)
484 val |= MX51_ECSPI_INT_RDREN;
485
486 writel(val, spi_imx->base + MX51_ECSPI_INT);
487}
488
489static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
490{
491 u32 reg;
492
493 reg = readl(spi_imx->base + MX51_ECSPI_CTRL);
494 reg |= MX51_ECSPI_CTRL_XCH;
495 writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
496}
497
498static void mx51_ecspi_disable(struct spi_imx_data *spi_imx)
499{
500 u32 ctrl;
501
502 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
503 ctrl &= ~MX51_ECSPI_CTRL_ENABLE;
504 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
505}
506
507static int mx51_ecspi_prepare_message(struct spi_imx_data *spi_imx,
508 struct spi_message *msg)
509{
510 struct spi_device *spi = msg->spi;
511 struct spi_transfer *xfer;
512 u32 ctrl = MX51_ECSPI_CTRL_ENABLE;
513 u32 min_speed_hz = ~0U;
514 u32 testreg, delay;
515 u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
516 u32 current_cfg = cfg;
517
518 /* set Master or Slave mode */
519 if (spi_imx->slave_mode)
520 ctrl &= ~MX51_ECSPI_CTRL_MODE_MASK;
521 else
522 ctrl |= MX51_ECSPI_CTRL_MODE_MASK;
523
524 /*
525 * Enable SPI_RDY handling (falling edge/level triggered).
526 */
527 if (spi->mode & SPI_READY)
528 ctrl |= MX51_ECSPI_CTRL_DRCTL(spi_imx->spi_drctl);
529
530 /* set chip select to use */
531 ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select);
532
533 /*
534 * The ctrl register must be written first, with the EN bit set other
535 * registers must not be written to.
536 */
537 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
538
539 testreg = readl(spi_imx->base + MX51_ECSPI_TESTREG);
540 if (spi->mode & SPI_LOOP)
541 testreg |= MX51_ECSPI_TESTREG_LBC;
542 else
543 testreg &= ~MX51_ECSPI_TESTREG_LBC;
544 writel(testreg, spi_imx->base + MX51_ECSPI_TESTREG);
545
546 /*
547 * eCSPI burst completion by Chip Select signal in Slave mode
548 * is not functional for imx53 Soc, config SPI burst completed when
549 * BURST_LENGTH + 1 bits are received
550 */
551 if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx))
552 cfg &= ~MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select);
553 else
554 cfg |= MX51_ECSPI_CONFIG_SBBCTRL(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 if (cfg == current_cfg)
570 return 0;
571
572 writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
573
574 /*
575 * Wait until the changes in the configuration register CONFIGREG
576 * propagate into the hardware. It takes exactly one tick of the
577 * SCLK clock, but we will wait two SCLK clock just to be sure. The
578 * effect of the delay it takes for the hardware to apply changes
579 * is noticable if the SCLK clock run very slow. In such a case, if
580 * the polarity of SCLK should be inverted, the GPIO ChipSelect might
581 * be asserted before the SCLK polarity changes, which would disrupt
582 * the SPI communication as the device on the other end would consider
583 * the change of SCLK polarity as a clock tick already.
584 *
585 * Because spi_imx->spi_bus_clk is only set in prepare_message
586 * callback, iterate over all the transfers in spi_message, find the
587 * one with lowest bus frequency, and use that bus frequency for the
588 * delay calculation. In case all transfers have speed_hz == 0, then
589 * min_speed_hz is ~0 and the resulting delay is zero.
590 */
591 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
592 if (!xfer->speed_hz)
593 continue;
594 min_speed_hz = min(xfer->speed_hz, min_speed_hz);
595 }
596
597 delay = (2 * 1000000) / min_speed_hz;
598 if (likely(delay < 10)) /* SCLK is faster than 200 kHz */
599 udelay(delay);
600 else /* SCLK is _very_ slow */
601 usleep_range(delay, delay + 10);
602
603 return 0;
604}
605
606static void mx51_configure_cpha(struct spi_imx_data *spi_imx,
607 struct spi_device *spi)
608{
609 bool cpha = (spi->mode & SPI_CPHA);
610 bool flip_cpha = (spi->mode & SPI_RX_CPHA_FLIP) && spi_imx->rx_only;
611 u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
612
613 /* Flip cpha logical value iff flip_cpha */
614 cpha ^= flip_cpha;
615
616 if (cpha)
617 cfg |= MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
618 else
619 cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
620
621 writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
622}
623
624static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
625 struct spi_device *spi)
626{
627 u32 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
628 u32 clk;
629
630 /* Clear BL field and set the right value */
631 ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
632 if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx))
633 ctrl |= (spi_imx->slave_burst * 8 - 1)
634 << MX51_ECSPI_CTRL_BL_OFFSET;
635 else
636 ctrl |= (spi_imx->bits_per_word - 1)
637 << MX51_ECSPI_CTRL_BL_OFFSET;
638
639 /* set clock speed */
640 ctrl &= ~(0xf << MX51_ECSPI_CTRL_POSTDIV_OFFSET |
641 0xf << MX51_ECSPI_CTRL_PREDIV_OFFSET);
642 ctrl |= mx51_ecspi_clkdiv(spi_imx, spi_imx->spi_bus_clk, &clk);
643 spi_imx->spi_bus_clk = clk;
644
645 mx51_configure_cpha(spi_imx, spi);
646
647 /*
648 * ERR009165: work in XHC mode instead of SMC as PIO on the chips
649 * before i.mx6ul.
650 */
651 if (spi_imx->usedma && spi_imx->devtype_data->tx_glitch_fixed)
652 ctrl |= MX51_ECSPI_CTRL_SMC;
653 else
654 ctrl &= ~MX51_ECSPI_CTRL_SMC;
655
656 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
657
658 return 0;
659}
660
661static void mx51_setup_wml(struct spi_imx_data *spi_imx)
662{
663 u32 tx_wml = 0;
664
665 if (spi_imx->devtype_data->tx_glitch_fixed)
666 tx_wml = spi_imx->wml;
667 /*
668 * Configure the DMA register: setup the watermark
669 * and enable DMA request.
670 */
671 writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml - 1) |
672 MX51_ECSPI_DMA_TX_WML(tx_wml) |
673 MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) |
674 MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN |
675 MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);
676}
677
678static int mx51_ecspi_rx_available(struct spi_imx_data *spi_imx)
679{
680 return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR;
681}
682
683static void mx51_ecspi_reset(struct spi_imx_data *spi_imx)
684{
685 /* drain receive buffer */
686 while (mx51_ecspi_rx_available(spi_imx))
687 readl(spi_imx->base + MXC_CSPIRXDATA);
688}
689
690#define MX31_INTREG_TEEN (1 << 0)
691#define MX31_INTREG_RREN (1 << 3)
692
693#define MX31_CSPICTRL_ENABLE (1 << 0)
694#define MX31_CSPICTRL_MASTER (1 << 1)
695#define MX31_CSPICTRL_XCH (1 << 2)
696#define MX31_CSPICTRL_SMC (1 << 3)
697#define MX31_CSPICTRL_POL (1 << 4)
698#define MX31_CSPICTRL_PHA (1 << 5)
699#define MX31_CSPICTRL_SSCTL (1 << 6)
700#define MX31_CSPICTRL_SSPOL (1 << 7)
701#define MX31_CSPICTRL_BC_SHIFT 8
702#define MX35_CSPICTRL_BL_SHIFT 20
703#define MX31_CSPICTRL_CS_SHIFT 24
704#define MX35_CSPICTRL_CS_SHIFT 12
705#define MX31_CSPICTRL_DR_SHIFT 16
706
707#define MX31_CSPI_DMAREG 0x10
708#define MX31_DMAREG_RH_DEN (1<<4)
709#define MX31_DMAREG_TH_DEN (1<<1)
710
711#define MX31_CSPISTATUS 0x14
712#define MX31_STATUS_RR (1 << 3)
713
714#define MX31_CSPI_TESTREG 0x1C
715#define MX31_TEST_LBC (1 << 14)
716
717/* These functions also work for the i.MX35, but be aware that
718 * the i.MX35 has a slightly different register layout for bits
719 * we do not use here.
720 */
721static void mx31_intctrl(struct spi_imx_data *spi_imx, int enable)
722{
723 unsigned int val = 0;
724
725 if (enable & MXC_INT_TE)
726 val |= MX31_INTREG_TEEN;
727 if (enable & MXC_INT_RR)
728 val |= MX31_INTREG_RREN;
729
730 writel(val, spi_imx->base + MXC_CSPIINT);
731}
732
733static void mx31_trigger(struct spi_imx_data *spi_imx)
734{
735 unsigned int reg;
736
737 reg = readl(spi_imx->base + MXC_CSPICTRL);
738 reg |= MX31_CSPICTRL_XCH;
739 writel(reg, spi_imx->base + MXC_CSPICTRL);
740}
741
742static int mx31_prepare_message(struct spi_imx_data *spi_imx,
743 struct spi_message *msg)
744{
745 return 0;
746}
747
748static int mx31_prepare_transfer(struct spi_imx_data *spi_imx,
749 struct spi_device *spi)
750{
751 unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
752 unsigned int clk;
753
754 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->spi_bus_clk, &clk) <<
755 MX31_CSPICTRL_DR_SHIFT;
756 spi_imx->spi_bus_clk = clk;
757
758 if (is_imx35_cspi(spi_imx)) {
759 reg |= (spi_imx->bits_per_word - 1) << MX35_CSPICTRL_BL_SHIFT;
760 reg |= MX31_CSPICTRL_SSCTL;
761 } else {
762 reg |= (spi_imx->bits_per_word - 1) << MX31_CSPICTRL_BC_SHIFT;
763 }
764
765 if (spi->mode & SPI_CPHA)
766 reg |= MX31_CSPICTRL_PHA;
767 if (spi->mode & SPI_CPOL)
768 reg |= MX31_CSPICTRL_POL;
769 if (spi->mode & SPI_CS_HIGH)
770 reg |= MX31_CSPICTRL_SSPOL;
771 if (!spi->cs_gpiod)
772 reg |= (spi->chip_select) <<
773 (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT :
774 MX31_CSPICTRL_CS_SHIFT);
775
776 if (spi_imx->usedma)
777 reg |= MX31_CSPICTRL_SMC;
778
779 writel(reg, spi_imx->base + MXC_CSPICTRL);
780
781 reg = readl(spi_imx->base + MX31_CSPI_TESTREG);
782 if (spi->mode & SPI_LOOP)
783 reg |= MX31_TEST_LBC;
784 else
785 reg &= ~MX31_TEST_LBC;
786 writel(reg, spi_imx->base + MX31_CSPI_TESTREG);
787
788 if (spi_imx->usedma) {
789 /*
790 * configure DMA requests when RXFIFO is half full and
791 * when TXFIFO is half empty
792 */
793 writel(MX31_DMAREG_RH_DEN | MX31_DMAREG_TH_DEN,
794 spi_imx->base + MX31_CSPI_DMAREG);
795 }
796
797 return 0;
798}
799
800static int mx31_rx_available(struct spi_imx_data *spi_imx)
801{
802 return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR;
803}
804
805static void mx31_reset(struct spi_imx_data *spi_imx)
806{
807 /* drain receive buffer */
808 while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR)
809 readl(spi_imx->base + MXC_CSPIRXDATA);
810}
811
812#define MX21_INTREG_RR (1 << 4)
813#define MX21_INTREG_TEEN (1 << 9)
814#define MX21_INTREG_RREN (1 << 13)
815
816#define MX21_CSPICTRL_POL (1 << 5)
817#define MX21_CSPICTRL_PHA (1 << 6)
818#define MX21_CSPICTRL_SSPOL (1 << 8)
819#define MX21_CSPICTRL_XCH (1 << 9)
820#define MX21_CSPICTRL_ENABLE (1 << 10)
821#define MX21_CSPICTRL_MASTER (1 << 11)
822#define MX21_CSPICTRL_DR_SHIFT 14
823#define MX21_CSPICTRL_CS_SHIFT 19
824
825static void mx21_intctrl(struct spi_imx_data *spi_imx, int enable)
826{
827 unsigned int val = 0;
828
829 if (enable & MXC_INT_TE)
830 val |= MX21_INTREG_TEEN;
831 if (enable & MXC_INT_RR)
832 val |= MX21_INTREG_RREN;
833
834 writel(val, spi_imx->base + MXC_CSPIINT);
835}
836
837static void mx21_trigger(struct spi_imx_data *spi_imx)
838{
839 unsigned int reg;
840
841 reg = readl(spi_imx->base + MXC_CSPICTRL);
842 reg |= MX21_CSPICTRL_XCH;
843 writel(reg, spi_imx->base + MXC_CSPICTRL);
844}
845
846static int mx21_prepare_message(struct spi_imx_data *spi_imx,
847 struct spi_message *msg)
848{
849 return 0;
850}
851
852static int mx21_prepare_transfer(struct spi_imx_data *spi_imx,
853 struct spi_device *spi)
854{
855 unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
856 unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
857 unsigned int clk;
858
859 reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, spi_imx->spi_bus_clk, max, &clk)
860 << MX21_CSPICTRL_DR_SHIFT;
861 spi_imx->spi_bus_clk = clk;
862
863 reg |= spi_imx->bits_per_word - 1;
864
865 if (spi->mode & SPI_CPHA)
866 reg |= MX21_CSPICTRL_PHA;
867 if (spi->mode & SPI_CPOL)
868 reg |= MX21_CSPICTRL_POL;
869 if (spi->mode & SPI_CS_HIGH)
870 reg |= MX21_CSPICTRL_SSPOL;
871 if (!spi->cs_gpiod)
872 reg |= spi->chip_select << MX21_CSPICTRL_CS_SHIFT;
873
874 writel(reg, spi_imx->base + MXC_CSPICTRL);
875
876 return 0;
877}
878
879static int mx21_rx_available(struct spi_imx_data *spi_imx)
880{
881 return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR;
882}
883
884static void mx21_reset(struct spi_imx_data *spi_imx)
885{
886 writel(1, spi_imx->base + MXC_RESET);
887}
888
889#define MX1_INTREG_RR (1 << 3)
890#define MX1_INTREG_TEEN (1 << 8)
891#define MX1_INTREG_RREN (1 << 11)
892
893#define MX1_CSPICTRL_POL (1 << 4)
894#define MX1_CSPICTRL_PHA (1 << 5)
895#define MX1_CSPICTRL_XCH (1 << 8)
896#define MX1_CSPICTRL_ENABLE (1 << 9)
897#define MX1_CSPICTRL_MASTER (1 << 10)
898#define MX1_CSPICTRL_DR_SHIFT 13
899
900static void mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
901{
902 unsigned int val = 0;
903
904 if (enable & MXC_INT_TE)
905 val |= MX1_INTREG_TEEN;
906 if (enable & MXC_INT_RR)
907 val |= MX1_INTREG_RREN;
908
909 writel(val, spi_imx->base + MXC_CSPIINT);
910}
911
912static void mx1_trigger(struct spi_imx_data *spi_imx)
913{
914 unsigned int reg;
915
916 reg = readl(spi_imx->base + MXC_CSPICTRL);
917 reg |= MX1_CSPICTRL_XCH;
918 writel(reg, spi_imx->base + MXC_CSPICTRL);
919}
920
921static int mx1_prepare_message(struct spi_imx_data *spi_imx,
922 struct spi_message *msg)
923{
924 return 0;
925}
926
927static int mx1_prepare_transfer(struct spi_imx_data *spi_imx,
928 struct spi_device *spi)
929{
930 unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;
931 unsigned int clk;
932
933 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->spi_bus_clk, &clk) <<
934 MX1_CSPICTRL_DR_SHIFT;
935 spi_imx->spi_bus_clk = clk;
936
937 reg |= spi_imx->bits_per_word - 1;
938
939 if (spi->mode & SPI_CPHA)
940 reg |= MX1_CSPICTRL_PHA;
941 if (spi->mode & SPI_CPOL)
942 reg |= MX1_CSPICTRL_POL;
943
944 writel(reg, spi_imx->base + MXC_CSPICTRL);
945
946 return 0;
947}
948
949static int mx1_rx_available(struct spi_imx_data *spi_imx)
950{
951 return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR;
952}
953
954static void mx1_reset(struct spi_imx_data *spi_imx)
955{
956 writel(1, spi_imx->base + MXC_RESET);
957}
958
959static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
960 .intctrl = mx1_intctrl,
961 .prepare_message = mx1_prepare_message,
962 .prepare_transfer = mx1_prepare_transfer,
963 .trigger = mx1_trigger,
964 .rx_available = mx1_rx_available,
965 .reset = mx1_reset,
966 .fifo_size = 8,
967 .has_dmamode = false,
968 .dynamic_burst = false,
969 .has_slavemode = false,
970 .devtype = IMX1_CSPI,
971};
972
973static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
974 .intctrl = mx21_intctrl,
975 .prepare_message = mx21_prepare_message,
976 .prepare_transfer = mx21_prepare_transfer,
977 .trigger = mx21_trigger,
978 .rx_available = mx21_rx_available,
979 .reset = mx21_reset,
980 .fifo_size = 8,
981 .has_dmamode = false,
982 .dynamic_burst = false,
983 .has_slavemode = false,
984 .devtype = IMX21_CSPI,
985};
986
987static struct spi_imx_devtype_data imx27_cspi_devtype_data = {
988 /* i.mx27 cspi shares the functions with i.mx21 one */
989 .intctrl = mx21_intctrl,
990 .prepare_message = mx21_prepare_message,
991 .prepare_transfer = mx21_prepare_transfer,
992 .trigger = mx21_trigger,
993 .rx_available = mx21_rx_available,
994 .reset = mx21_reset,
995 .fifo_size = 8,
996 .has_dmamode = false,
997 .dynamic_burst = false,
998 .has_slavemode = false,
999 .devtype = IMX27_CSPI,
1000};
1001
1002static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
1003 .intctrl = mx31_intctrl,
1004 .prepare_message = mx31_prepare_message,
1005 .prepare_transfer = mx31_prepare_transfer,
1006 .trigger = mx31_trigger,
1007 .rx_available = mx31_rx_available,
1008 .reset = mx31_reset,
1009 .fifo_size = 8,
1010 .has_dmamode = false,
1011 .dynamic_burst = false,
1012 .has_slavemode = false,
1013 .devtype = IMX31_CSPI,
1014};
1015
1016static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
1017 /* i.mx35 and later cspi shares the functions with i.mx31 one */
1018 .intctrl = mx31_intctrl,
1019 .prepare_message = mx31_prepare_message,
1020 .prepare_transfer = mx31_prepare_transfer,
1021 .trigger = mx31_trigger,
1022 .rx_available = mx31_rx_available,
1023 .reset = mx31_reset,
1024 .fifo_size = 8,
1025 .has_dmamode = true,
1026 .dynamic_burst = false,
1027 .has_slavemode = false,
1028 .devtype = IMX35_CSPI,
1029};
1030
1031static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
1032 .intctrl = mx51_ecspi_intctrl,
1033 .prepare_message = mx51_ecspi_prepare_message,
1034 .prepare_transfer = mx51_ecspi_prepare_transfer,
1035 .trigger = mx51_ecspi_trigger,
1036 .rx_available = mx51_ecspi_rx_available,
1037 .reset = mx51_ecspi_reset,
1038 .setup_wml = mx51_setup_wml,
1039 .fifo_size = 64,
1040 .has_dmamode = true,
1041 .dynamic_burst = true,
1042 .has_slavemode = true,
1043 .disable = mx51_ecspi_disable,
1044 .devtype = IMX51_ECSPI,
1045};
1046
1047static struct spi_imx_devtype_data imx53_ecspi_devtype_data = {
1048 .intctrl = mx51_ecspi_intctrl,
1049 .prepare_message = mx51_ecspi_prepare_message,
1050 .prepare_transfer = mx51_ecspi_prepare_transfer,
1051 .trigger = mx51_ecspi_trigger,
1052 .rx_available = mx51_ecspi_rx_available,
1053 .reset = mx51_ecspi_reset,
1054 .fifo_size = 64,
1055 .has_dmamode = true,
1056 .has_slavemode = true,
1057 .disable = mx51_ecspi_disable,
1058 .devtype = IMX53_ECSPI,
1059};
1060
1061static struct spi_imx_devtype_data imx6ul_ecspi_devtype_data = {
1062 .intctrl = mx51_ecspi_intctrl,
1063 .prepare_message = mx51_ecspi_prepare_message,
1064 .prepare_transfer = mx51_ecspi_prepare_transfer,
1065 .trigger = mx51_ecspi_trigger,
1066 .rx_available = mx51_ecspi_rx_available,
1067 .reset = mx51_ecspi_reset,
1068 .setup_wml = mx51_setup_wml,
1069 .fifo_size = 64,
1070 .has_dmamode = true,
1071 .dynamic_burst = true,
1072 .has_slavemode = true,
1073 .tx_glitch_fixed = true,
1074 .disable = mx51_ecspi_disable,
1075 .devtype = IMX51_ECSPI,
1076};
1077
1078static const struct of_device_id spi_imx_dt_ids[] = {
1079 { .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
1080 { .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
1081 { .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
1082 { .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
1083 { .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
1084 { .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
1085 { .compatible = "fsl,imx53-ecspi", .data = &imx53_ecspi_devtype_data, },
1086 { .compatible = "fsl,imx6ul-ecspi", .data = &imx6ul_ecspi_devtype_data, },
1087 { /* sentinel */ }
1088};
1089MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);
1090
1091static void spi_imx_set_burst_len(struct spi_imx_data *spi_imx, int n_bits)
1092{
1093 u32 ctrl;
1094
1095 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
1096 ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
1097 ctrl |= ((n_bits - 1) << MX51_ECSPI_CTRL_BL_OFFSET);
1098 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
1099}
1100
1101static void spi_imx_push(struct spi_imx_data *spi_imx)
1102{
1103 unsigned int burst_len;
1104
1105 /*
1106 * Reload the FIFO when the remaining bytes to be transferred in the
1107 * current burst is 0. This only applies when bits_per_word is a
1108 * multiple of 8.
1109 */
1110 if (!spi_imx->remainder) {
1111 if (spi_imx->dynamic_burst) {
1112
1113 /* We need to deal unaligned data first */
1114 burst_len = spi_imx->count % MX51_ECSPI_CTRL_MAX_BURST;
1115
1116 if (!burst_len)
1117 burst_len = MX51_ECSPI_CTRL_MAX_BURST;
1118
1119 spi_imx_set_burst_len(spi_imx, burst_len * 8);
1120
1121 spi_imx->remainder = burst_len;
1122 } else {
1123 spi_imx->remainder = spi_imx_bytes_per_word(spi_imx->bits_per_word);
1124 }
1125 }
1126
1127 while (spi_imx->txfifo < spi_imx->devtype_data->fifo_size) {
1128 if (!spi_imx->count)
1129 break;
1130 if (spi_imx->dynamic_burst &&
1131 spi_imx->txfifo >= DIV_ROUND_UP(spi_imx->remainder, 4))
1132 break;
1133 spi_imx->tx(spi_imx);
1134 spi_imx->txfifo++;
1135 }
1136
1137 if (!spi_imx->slave_mode)
1138 spi_imx->devtype_data->trigger(spi_imx);
1139}
1140
1141static irqreturn_t spi_imx_isr(int irq, void *dev_id)
1142{
1143 struct spi_imx_data *spi_imx = dev_id;
1144
1145 while (spi_imx->txfifo &&
1146 spi_imx->devtype_data->rx_available(spi_imx)) {
1147 spi_imx->rx(spi_imx);
1148 spi_imx->txfifo--;
1149 }
1150
1151 if (spi_imx->count) {
1152 spi_imx_push(spi_imx);
1153 return IRQ_HANDLED;
1154 }
1155
1156 if (spi_imx->txfifo) {
1157 /* No data left to push, but still waiting for rx data,
1158 * enable receive data available interrupt.
1159 */
1160 spi_imx->devtype_data->intctrl(
1161 spi_imx, MXC_INT_RR);
1162 return IRQ_HANDLED;
1163 }
1164
1165 spi_imx->devtype_data->intctrl(spi_imx, 0);
1166 complete(&spi_imx->xfer_done);
1167
1168 return IRQ_HANDLED;
1169}
1170
1171static int spi_imx_dma_configure(struct spi_controller *controller)
1172{
1173 int ret;
1174 enum dma_slave_buswidth buswidth;
1175 struct dma_slave_config rx = {}, tx = {};
1176 struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1177
1178 switch (spi_imx_bytes_per_word(spi_imx->bits_per_word)) {
1179 case 4:
1180 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
1181 break;
1182 case 2:
1183 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
1184 break;
1185 case 1:
1186 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
1187 break;
1188 default:
1189 return -EINVAL;
1190 }
1191
1192 tx.direction = DMA_MEM_TO_DEV;
1193 tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA;
1194 tx.dst_addr_width = buswidth;
1195 tx.dst_maxburst = spi_imx->wml;
1196 ret = dmaengine_slave_config(controller->dma_tx, &tx);
1197 if (ret) {
1198 dev_err(spi_imx->dev, "TX dma configuration failed with %d\n", ret);
1199 return ret;
1200 }
1201
1202 rx.direction = DMA_DEV_TO_MEM;
1203 rx.src_addr = spi_imx->base_phys + MXC_CSPIRXDATA;
1204 rx.src_addr_width = buswidth;
1205 rx.src_maxburst = spi_imx->wml;
1206 ret = dmaengine_slave_config(controller->dma_rx, &rx);
1207 if (ret) {
1208 dev_err(spi_imx->dev, "RX dma configuration failed with %d\n", ret);
1209 return ret;
1210 }
1211
1212 return 0;
1213}
1214
1215static int spi_imx_setupxfer(struct spi_device *spi,
1216 struct spi_transfer *t)
1217{
1218 struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1219
1220 if (!t)
1221 return 0;
1222
1223 if (!t->speed_hz) {
1224 if (!spi->max_speed_hz) {
1225 dev_err(&spi->dev, "no speed_hz provided!\n");
1226 return -EINVAL;
1227 }
1228 dev_dbg(&spi->dev, "using spi->max_speed_hz!\n");
1229 spi_imx->spi_bus_clk = spi->max_speed_hz;
1230 } else
1231 spi_imx->spi_bus_clk = t->speed_hz;
1232
1233 spi_imx->bits_per_word = t->bits_per_word;
1234
1235 /*
1236 * Initialize the functions for transfer. To transfer non byte-aligned
1237 * words, we have to use multiple word-size bursts, we can't use
1238 * dynamic_burst in that case.
1239 */
1240 if (spi_imx->devtype_data->dynamic_burst && !spi_imx->slave_mode &&
1241 !(spi->mode & SPI_CS_WORD) &&
1242 (spi_imx->bits_per_word == 8 ||
1243 spi_imx->bits_per_word == 16 ||
1244 spi_imx->bits_per_word == 32)) {
1245
1246 spi_imx->rx = spi_imx_buf_rx_swap;
1247 spi_imx->tx = spi_imx_buf_tx_swap;
1248 spi_imx->dynamic_burst = 1;
1249
1250 } else {
1251 if (spi_imx->bits_per_word <= 8) {
1252 spi_imx->rx = spi_imx_buf_rx_u8;
1253 spi_imx->tx = spi_imx_buf_tx_u8;
1254 } else if (spi_imx->bits_per_word <= 16) {
1255 spi_imx->rx = spi_imx_buf_rx_u16;
1256 spi_imx->tx = spi_imx_buf_tx_u16;
1257 } else {
1258 spi_imx->rx = spi_imx_buf_rx_u32;
1259 spi_imx->tx = spi_imx_buf_tx_u32;
1260 }
1261 spi_imx->dynamic_burst = 0;
1262 }
1263
1264 if (spi_imx_can_dma(spi_imx->controller, spi, t))
1265 spi_imx->usedma = true;
1266 else
1267 spi_imx->usedma = false;
1268
1269 spi_imx->rx_only = ((t->tx_buf == NULL)
1270 || (t->tx_buf == spi->controller->dummy_tx));
1271
1272 if (is_imx53_ecspi(spi_imx) && spi_imx->slave_mode) {
1273 spi_imx->rx = mx53_ecspi_rx_slave;
1274 spi_imx->tx = mx53_ecspi_tx_slave;
1275 spi_imx->slave_burst = t->len;
1276 }
1277
1278 spi_imx->devtype_data->prepare_transfer(spi_imx, spi);
1279
1280 return 0;
1281}
1282
1283static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
1284{
1285 struct spi_controller *controller = spi_imx->controller;
1286
1287 if (controller->dma_rx) {
1288 dma_release_channel(controller->dma_rx);
1289 controller->dma_rx = NULL;
1290 }
1291
1292 if (controller->dma_tx) {
1293 dma_release_channel(controller->dma_tx);
1294 controller->dma_tx = NULL;
1295 }
1296}
1297
1298static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
1299 struct spi_controller *controller)
1300{
1301 int ret;
1302
1303 spi_imx->wml = spi_imx->devtype_data->fifo_size / 2;
1304
1305 /* Prepare for TX DMA: */
1306 controller->dma_tx = dma_request_chan(dev, "tx");
1307 if (IS_ERR(controller->dma_tx)) {
1308 ret = PTR_ERR(controller->dma_tx);
1309 dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret);
1310 controller->dma_tx = NULL;
1311 goto err;
1312 }
1313
1314 /* Prepare for RX : */
1315 controller->dma_rx = dma_request_chan(dev, "rx");
1316 if (IS_ERR(controller->dma_rx)) {
1317 ret = PTR_ERR(controller->dma_rx);
1318 dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret);
1319 controller->dma_rx = NULL;
1320 goto err;
1321 }
1322
1323 init_completion(&spi_imx->dma_rx_completion);
1324 init_completion(&spi_imx->dma_tx_completion);
1325 controller->can_dma = spi_imx_can_dma;
1326 controller->max_dma_len = MAX_SDMA_BD_BYTES;
1327 spi_imx->controller->flags = SPI_CONTROLLER_MUST_RX |
1328 SPI_CONTROLLER_MUST_TX;
1329
1330 return 0;
1331err:
1332 spi_imx_sdma_exit(spi_imx);
1333 return ret;
1334}
1335
1336static void spi_imx_dma_rx_callback(void *cookie)
1337{
1338 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
1339
1340 complete(&spi_imx->dma_rx_completion);
1341}
1342
1343static void spi_imx_dma_tx_callback(void *cookie)
1344{
1345 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
1346
1347 complete(&spi_imx->dma_tx_completion);
1348}
1349
1350static int spi_imx_calculate_timeout(struct spi_imx_data *spi_imx, int size)
1351{
1352 unsigned long timeout = 0;
1353
1354 /* Time with actual data transfer and CS change delay related to HW */
1355 timeout = (8 + 4) * size / spi_imx->spi_bus_clk;
1356
1357 /* Add extra second for scheduler related activities */
1358 timeout += 1;
1359
1360 /* Double calculated timeout */
1361 return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC);
1362}
1363
1364static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
1365 struct spi_transfer *transfer)
1366{
1367 struct dma_async_tx_descriptor *desc_tx, *desc_rx;
1368 unsigned long transfer_timeout;
1369 unsigned long timeout;
1370 struct spi_controller *controller = spi_imx->controller;
1371 struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
1372 struct scatterlist *last_sg = sg_last(rx->sgl, rx->nents);
1373 unsigned int bytes_per_word, i;
1374 int ret;
1375
1376 /* Get the right burst length from the last sg to ensure no tail data */
1377 bytes_per_word = spi_imx_bytes_per_word(transfer->bits_per_word);
1378 for (i = spi_imx->devtype_data->fifo_size / 2; i > 0; i--) {
1379 if (!(sg_dma_len(last_sg) % (i * bytes_per_word)))
1380 break;
1381 }
1382 /* Use 1 as wml in case no available burst length got */
1383 if (i == 0)
1384 i = 1;
1385
1386 spi_imx->wml = i;
1387
1388 ret = spi_imx_dma_configure(controller);
1389 if (ret)
1390 goto dma_failure_no_start;
1391
1392 if (!spi_imx->devtype_data->setup_wml) {
1393 dev_err(spi_imx->dev, "No setup_wml()?\n");
1394 ret = -EINVAL;
1395 goto dma_failure_no_start;
1396 }
1397 spi_imx->devtype_data->setup_wml(spi_imx);
1398
1399 /*
1400 * The TX DMA setup starts the transfer, so make sure RX is configured
1401 * before TX.
1402 */
1403 desc_rx = dmaengine_prep_slave_sg(controller->dma_rx,
1404 rx->sgl, rx->nents, DMA_DEV_TO_MEM,
1405 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1406 if (!desc_rx) {
1407 ret = -EINVAL;
1408 goto dma_failure_no_start;
1409 }
1410
1411 desc_rx->callback = spi_imx_dma_rx_callback;
1412 desc_rx->callback_param = (void *)spi_imx;
1413 dmaengine_submit(desc_rx);
1414 reinit_completion(&spi_imx->dma_rx_completion);
1415 dma_async_issue_pending(controller->dma_rx);
1416
1417 desc_tx = dmaengine_prep_slave_sg(controller->dma_tx,
1418 tx->sgl, tx->nents, DMA_MEM_TO_DEV,
1419 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1420 if (!desc_tx) {
1421 dmaengine_terminate_all(controller->dma_tx);
1422 dmaengine_terminate_all(controller->dma_rx);
1423 return -EINVAL;
1424 }
1425
1426 desc_tx->callback = spi_imx_dma_tx_callback;
1427 desc_tx->callback_param = (void *)spi_imx;
1428 dmaengine_submit(desc_tx);
1429 reinit_completion(&spi_imx->dma_tx_completion);
1430 dma_async_issue_pending(controller->dma_tx);
1431
1432 transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1433
1434 /* Wait SDMA to finish the data transfer.*/
1435 timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
1436 transfer_timeout);
1437 if (!timeout) {
1438 dev_err(spi_imx->dev, "I/O Error in DMA TX\n");
1439 dmaengine_terminate_all(controller->dma_tx);
1440 dmaengine_terminate_all(controller->dma_rx);
1441 return -ETIMEDOUT;
1442 }
1443
1444 timeout = wait_for_completion_timeout(&spi_imx->dma_rx_completion,
1445 transfer_timeout);
1446 if (!timeout) {
1447 dev_err(&controller->dev, "I/O Error in DMA RX\n");
1448 spi_imx->devtype_data->reset(spi_imx);
1449 dmaengine_terminate_all(controller->dma_rx);
1450 return -ETIMEDOUT;
1451 }
1452
1453 return 0;
1454/* fallback to pio */
1455dma_failure_no_start:
1456 transfer->error |= SPI_TRANS_FAIL_NO_START;
1457 return ret;
1458}
1459
1460static int spi_imx_pio_transfer(struct spi_device *spi,
1461 struct spi_transfer *transfer)
1462{
1463 struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1464 unsigned long transfer_timeout;
1465 unsigned long timeout;
1466
1467 spi_imx->tx_buf = transfer->tx_buf;
1468 spi_imx->rx_buf = transfer->rx_buf;
1469 spi_imx->count = transfer->len;
1470 spi_imx->txfifo = 0;
1471 spi_imx->remainder = 0;
1472
1473 reinit_completion(&spi_imx->xfer_done);
1474
1475 spi_imx_push(spi_imx);
1476
1477 spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE);
1478
1479 transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1480
1481 timeout = wait_for_completion_timeout(&spi_imx->xfer_done,
1482 transfer_timeout);
1483 if (!timeout) {
1484 dev_err(&spi->dev, "I/O Error in PIO\n");
1485 spi_imx->devtype_data->reset(spi_imx);
1486 return -ETIMEDOUT;
1487 }
1488
1489 return 0;
1490}
1491
1492static int spi_imx_poll_transfer(struct spi_device *spi,
1493 struct spi_transfer *transfer)
1494{
1495 struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1496 unsigned long timeout;
1497
1498 spi_imx->tx_buf = transfer->tx_buf;
1499 spi_imx->rx_buf = transfer->rx_buf;
1500 spi_imx->count = transfer->len;
1501 spi_imx->txfifo = 0;
1502 spi_imx->remainder = 0;
1503
1504 /* fill in the fifo before timeout calculations if we are
1505 * interrupted here, then the data is getting transferred by
1506 * the HW while we are interrupted
1507 */
1508 spi_imx_push(spi_imx);
1509
1510 timeout = spi_imx_calculate_timeout(spi_imx, transfer->len) + jiffies;
1511 while (spi_imx->txfifo) {
1512 /* RX */
1513 while (spi_imx->txfifo &&
1514 spi_imx->devtype_data->rx_available(spi_imx)) {
1515 spi_imx->rx(spi_imx);
1516 spi_imx->txfifo--;
1517 }
1518
1519 /* TX */
1520 if (spi_imx->count) {
1521 spi_imx_push(spi_imx);
1522 continue;
1523 }
1524
1525 if (spi_imx->txfifo &&
1526 time_after(jiffies, timeout)) {
1527
1528 dev_err_ratelimited(&spi->dev,
1529 "timeout period reached: jiffies: %lu- falling back to interrupt mode\n",
1530 jiffies - timeout);
1531
1532 /* fall back to interrupt mode */
1533 return spi_imx_pio_transfer(spi, transfer);
1534 }
1535 }
1536
1537 return 0;
1538}
1539
1540static int spi_imx_pio_transfer_slave(struct spi_device *spi,
1541 struct spi_transfer *transfer)
1542{
1543 struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1544 int ret = 0;
1545
1546 if (is_imx53_ecspi(spi_imx) &&
1547 transfer->len > MX53_MAX_TRANSFER_BYTES) {
1548 dev_err(&spi->dev, "Transaction too big, max size is %d bytes\n",
1549 MX53_MAX_TRANSFER_BYTES);
1550 return -EMSGSIZE;
1551 }
1552
1553 spi_imx->tx_buf = transfer->tx_buf;
1554 spi_imx->rx_buf = transfer->rx_buf;
1555 spi_imx->count = transfer->len;
1556 spi_imx->txfifo = 0;
1557 spi_imx->remainder = 0;
1558
1559 reinit_completion(&spi_imx->xfer_done);
1560 spi_imx->slave_aborted = false;
1561
1562 spi_imx_push(spi_imx);
1563
1564 spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE | MXC_INT_RDR);
1565
1566 if (wait_for_completion_interruptible(&spi_imx->xfer_done) ||
1567 spi_imx->slave_aborted) {
1568 dev_dbg(&spi->dev, "interrupted\n");
1569 ret = -EINTR;
1570 }
1571
1572 /* ecspi has a HW issue when works in Slave mode,
1573 * after 64 words writtern to TXFIFO, even TXFIFO becomes empty,
1574 * ECSPI_TXDATA keeps shift out the last word data,
1575 * so we have to disable ECSPI when in slave mode after the
1576 * transfer completes
1577 */
1578 if (spi_imx->devtype_data->disable)
1579 spi_imx->devtype_data->disable(spi_imx);
1580
1581 return ret;
1582}
1583
1584static int spi_imx_transfer_one(struct spi_controller *controller,
1585 struct spi_device *spi,
1586 struct spi_transfer *transfer)
1587{
1588 struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1589 unsigned long hz_per_byte, byte_limit;
1590
1591 spi_imx_setupxfer(spi, transfer);
1592 transfer->effective_speed_hz = spi_imx->spi_bus_clk;
1593
1594 /* flush rxfifo before transfer */
1595 while (spi_imx->devtype_data->rx_available(spi_imx))
1596 readl(spi_imx->base + MXC_CSPIRXDATA);
1597
1598 if (spi_imx->slave_mode)
1599 return spi_imx_pio_transfer_slave(spi, transfer);
1600
1601 /*
1602 * If we decided in spi_imx_can_dma() that we want to do a DMA
1603 * transfer, the SPI transfer has already been mapped, so we
1604 * have to do the DMA transfer here.
1605 */
1606 if (spi_imx->usedma)
1607 return spi_imx_dma_transfer(spi_imx, transfer);
1608 /*
1609 * Calculate the estimated time in us the transfer runs. Find
1610 * the number of Hz per byte per polling limit.
1611 */
1612 hz_per_byte = polling_limit_us ? ((8 + 4) * USEC_PER_SEC) / polling_limit_us : 0;
1613 byte_limit = hz_per_byte ? transfer->effective_speed_hz / hz_per_byte : 1;
1614
1615 /* run in polling mode for short transfers */
1616 if (transfer->len < byte_limit)
1617 return spi_imx_poll_transfer(spi, transfer);
1618
1619 return spi_imx_pio_transfer(spi, transfer);
1620}
1621
1622static int spi_imx_setup(struct spi_device *spi)
1623{
1624 dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__,
1625 spi->mode, spi->bits_per_word, spi->max_speed_hz);
1626
1627 return 0;
1628}
1629
1630static void spi_imx_cleanup(struct spi_device *spi)
1631{
1632}
1633
1634static int
1635spi_imx_prepare_message(struct spi_controller *controller, struct spi_message *msg)
1636{
1637 struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1638 int ret;
1639
1640 ret = pm_runtime_resume_and_get(spi_imx->dev);
1641 if (ret < 0) {
1642 dev_err(spi_imx->dev, "failed to enable clock\n");
1643 return ret;
1644 }
1645
1646 ret = spi_imx->devtype_data->prepare_message(spi_imx, msg);
1647 if (ret) {
1648 pm_runtime_mark_last_busy(spi_imx->dev);
1649 pm_runtime_put_autosuspend(spi_imx->dev);
1650 }
1651
1652 return ret;
1653}
1654
1655static int
1656spi_imx_unprepare_message(struct spi_controller *controller, struct spi_message *msg)
1657{
1658 struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1659
1660 pm_runtime_mark_last_busy(spi_imx->dev);
1661 pm_runtime_put_autosuspend(spi_imx->dev);
1662 return 0;
1663}
1664
1665static int spi_imx_slave_abort(struct spi_controller *controller)
1666{
1667 struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1668
1669 spi_imx->slave_aborted = true;
1670 complete(&spi_imx->xfer_done);
1671
1672 return 0;
1673}
1674
1675static int spi_imx_probe(struct platform_device *pdev)
1676{
1677 struct device_node *np = pdev->dev.of_node;
1678 struct spi_controller *controller;
1679 struct spi_imx_data *spi_imx;
1680 struct resource *res;
1681 int ret, irq, spi_drctl;
1682 const struct spi_imx_devtype_data *devtype_data =
1683 of_device_get_match_data(&pdev->dev);
1684 bool slave_mode;
1685 u32 val;
1686
1687 slave_mode = devtype_data->has_slavemode &&
1688 of_property_read_bool(np, "spi-slave");
1689 if (slave_mode)
1690 controller = spi_alloc_slave(&pdev->dev,
1691 sizeof(struct spi_imx_data));
1692 else
1693 controller = spi_alloc_master(&pdev->dev,
1694 sizeof(struct spi_imx_data));
1695 if (!controller)
1696 return -ENOMEM;
1697
1698 ret = of_property_read_u32(np, "fsl,spi-rdy-drctl", &spi_drctl);
1699 if ((ret < 0) || (spi_drctl >= 0x3)) {
1700 /* '11' is reserved */
1701 spi_drctl = 0;
1702 }
1703
1704 platform_set_drvdata(pdev, controller);
1705
1706 controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
1707 controller->bus_num = np ? -1 : pdev->id;
1708 controller->use_gpio_descriptors = true;
1709
1710 spi_imx = spi_controller_get_devdata(controller);
1711 spi_imx->controller = controller;
1712 spi_imx->dev = &pdev->dev;
1713 spi_imx->slave_mode = slave_mode;
1714
1715 spi_imx->devtype_data = devtype_data;
1716
1717 /*
1718 * Get number of chip selects from device properties. This can be
1719 * coming from device tree or boardfiles, if it is not defined,
1720 * a default value of 3 chip selects will be used, as all the legacy
1721 * board files have <= 3 chip selects.
1722 */
1723 if (!device_property_read_u32(&pdev->dev, "num-cs", &val))
1724 controller->num_chipselect = val;
1725 else
1726 controller->num_chipselect = 3;
1727
1728 spi_imx->controller->transfer_one = spi_imx_transfer_one;
1729 spi_imx->controller->setup = spi_imx_setup;
1730 spi_imx->controller->cleanup = spi_imx_cleanup;
1731 spi_imx->controller->prepare_message = spi_imx_prepare_message;
1732 spi_imx->controller->unprepare_message = spi_imx_unprepare_message;
1733 spi_imx->controller->slave_abort = spi_imx_slave_abort;
1734 spi_imx->controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_NO_CS;
1735
1736 if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) ||
1737 is_imx53_ecspi(spi_imx))
1738 spi_imx->controller->mode_bits |= SPI_LOOP | SPI_READY;
1739
1740 if (is_imx51_ecspi(spi_imx) || is_imx53_ecspi(spi_imx))
1741 spi_imx->controller->mode_bits |= SPI_RX_CPHA_FLIP;
1742
1743 if (is_imx51_ecspi(spi_imx) &&
1744 device_property_read_u32(&pdev->dev, "cs-gpios", NULL))
1745 /*
1746 * When using HW-CS implementing SPI_CS_WORD can be done by just
1747 * setting the burst length to the word size. This is
1748 * considerably faster than manually controlling the CS.
1749 */
1750 spi_imx->controller->mode_bits |= SPI_CS_WORD;
1751
1752 spi_imx->spi_drctl = spi_drctl;
1753
1754 init_completion(&spi_imx->xfer_done);
1755
1756 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1757 spi_imx->base = devm_ioremap_resource(&pdev->dev, res);
1758 if (IS_ERR(spi_imx->base)) {
1759 ret = PTR_ERR(spi_imx->base);
1760 goto out_controller_put;
1761 }
1762 spi_imx->base_phys = res->start;
1763
1764 irq = platform_get_irq(pdev, 0);
1765 if (irq < 0) {
1766 ret = irq;
1767 goto out_controller_put;
1768 }
1769
1770 ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0,
1771 dev_name(&pdev->dev), spi_imx);
1772 if (ret) {
1773 dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
1774 goto out_controller_put;
1775 }
1776
1777 spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1778 if (IS_ERR(spi_imx->clk_ipg)) {
1779 ret = PTR_ERR(spi_imx->clk_ipg);
1780 goto out_controller_put;
1781 }
1782
1783 spi_imx->clk_per = devm_clk_get(&pdev->dev, "per");
1784 if (IS_ERR(spi_imx->clk_per)) {
1785 ret = PTR_ERR(spi_imx->clk_per);
1786 goto out_controller_put;
1787 }
1788
1789 ret = clk_prepare_enable(spi_imx->clk_per);
1790 if (ret)
1791 goto out_controller_put;
1792
1793 ret = clk_prepare_enable(spi_imx->clk_ipg);
1794 if (ret)
1795 goto out_put_per;
1796
1797 pm_runtime_set_autosuspend_delay(spi_imx->dev, MXC_RPM_TIMEOUT);
1798 pm_runtime_use_autosuspend(spi_imx->dev);
1799 pm_runtime_get_noresume(spi_imx->dev);
1800 pm_runtime_set_active(spi_imx->dev);
1801 pm_runtime_enable(spi_imx->dev);
1802
1803 spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
1804 /*
1805 * Only validated on i.mx35 and i.mx6 now, can remove the constraint
1806 * if validated on other chips.
1807 */
1808 if (spi_imx->devtype_data->has_dmamode) {
1809 ret = spi_imx_sdma_init(&pdev->dev, spi_imx, controller);
1810 if (ret == -EPROBE_DEFER)
1811 goto out_runtime_pm_put;
1812
1813 if (ret < 0)
1814 dev_dbg(&pdev->dev, "dma setup error %d, use pio\n",
1815 ret);
1816 }
1817
1818 spi_imx->devtype_data->reset(spi_imx);
1819
1820 spi_imx->devtype_data->intctrl(spi_imx, 0);
1821
1822 controller->dev.of_node = pdev->dev.of_node;
1823 ret = spi_register_controller(controller);
1824 if (ret) {
1825 dev_err_probe(&pdev->dev, ret, "register controller failed\n");
1826 goto out_register_controller;
1827 }
1828
1829 pm_runtime_mark_last_busy(spi_imx->dev);
1830 pm_runtime_put_autosuspend(spi_imx->dev);
1831
1832 return ret;
1833
1834out_register_controller:
1835 if (spi_imx->devtype_data->has_dmamode)
1836 spi_imx_sdma_exit(spi_imx);
1837out_runtime_pm_put:
1838 pm_runtime_dont_use_autosuspend(spi_imx->dev);
1839 pm_runtime_set_suspended(&pdev->dev);
1840 pm_runtime_disable(spi_imx->dev);
1841
1842 clk_disable_unprepare(spi_imx->clk_ipg);
1843out_put_per:
1844 clk_disable_unprepare(spi_imx->clk_per);
1845out_controller_put:
1846 spi_controller_put(controller);
1847
1848 return ret;
1849}
1850
1851static int spi_imx_remove(struct platform_device *pdev)
1852{
1853 struct spi_controller *controller = platform_get_drvdata(pdev);
1854 struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1855 int ret;
1856
1857 spi_unregister_controller(controller);
1858
1859 ret = pm_runtime_resume_and_get(spi_imx->dev);
1860 if (ret < 0) {
1861 dev_err(spi_imx->dev, "failed to enable clock\n");
1862 return ret;
1863 }
1864
1865 writel(0, spi_imx->base + MXC_CSPICTRL);
1866
1867 pm_runtime_dont_use_autosuspend(spi_imx->dev);
1868 pm_runtime_put_sync(spi_imx->dev);
1869 pm_runtime_disable(spi_imx->dev);
1870
1871 spi_imx_sdma_exit(spi_imx);
1872
1873 return 0;
1874}
1875
1876static int __maybe_unused spi_imx_runtime_resume(struct device *dev)
1877{
1878 struct spi_controller *controller = dev_get_drvdata(dev);
1879 struct spi_imx_data *spi_imx;
1880 int ret;
1881
1882 spi_imx = spi_controller_get_devdata(controller);
1883
1884 ret = clk_prepare_enable(spi_imx->clk_per);
1885 if (ret)
1886 return ret;
1887
1888 ret = clk_prepare_enable(spi_imx->clk_ipg);
1889 if (ret) {
1890 clk_disable_unprepare(spi_imx->clk_per);
1891 return ret;
1892 }
1893
1894 return 0;
1895}
1896
1897static int __maybe_unused spi_imx_runtime_suspend(struct device *dev)
1898{
1899 struct spi_controller *controller = dev_get_drvdata(dev);
1900 struct spi_imx_data *spi_imx;
1901
1902 spi_imx = spi_controller_get_devdata(controller);
1903
1904 clk_disable_unprepare(spi_imx->clk_per);
1905 clk_disable_unprepare(spi_imx->clk_ipg);
1906
1907 return 0;
1908}
1909
1910static int __maybe_unused spi_imx_suspend(struct device *dev)
1911{
1912 pinctrl_pm_select_sleep_state(dev);
1913 return 0;
1914}
1915
1916static int __maybe_unused spi_imx_resume(struct device *dev)
1917{
1918 pinctrl_pm_select_default_state(dev);
1919 return 0;
1920}
1921
1922static const struct dev_pm_ops imx_spi_pm = {
1923 SET_RUNTIME_PM_OPS(spi_imx_runtime_suspend,
1924 spi_imx_runtime_resume, NULL)
1925 SET_SYSTEM_SLEEP_PM_OPS(spi_imx_suspend, spi_imx_resume)
1926};
1927
1928static struct platform_driver spi_imx_driver = {
1929 .driver = {
1930 .name = DRIVER_NAME,
1931 .of_match_table = spi_imx_dt_ids,
1932 .pm = &imx_spi_pm,
1933 },
1934 .probe = spi_imx_probe,
1935 .remove = spi_imx_remove,
1936};
1937module_platform_driver(spi_imx_driver);
1938
1939MODULE_DESCRIPTION("i.MX SPI Controller driver");
1940MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1941MODULE_LICENSE("GPL");
1942MODULE_ALIAS("platform:" DRIVER_NAME);
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/bits.h>
6#include <linux/bitfield.h>
7#include <linux/clk.h>
8#include <linux/completion.h>
9#include <linux/delay.h>
10#include <linux/dmaengine.h>
11#include <linux/dma-mapping.h>
12#include <linux/err.h>
13#include <linux/interrupt.h>
14#include <linux/io.h>
15#include <linux/irq.h>
16#include <linux/kernel.h>
17#include <linux/math.h>
18#include <linux/math64.h>
19#include <linux/module.h>
20#include <linux/overflow.h>
21#include <linux/pinctrl/consumer.h>
22#include <linux/platform_device.h>
23#include <linux/pm_runtime.h>
24#include <linux/slab.h>
25#include <linux/spi/spi.h>
26#include <linux/types.h>
27#include <linux/of.h>
28#include <linux/property.h>
29
30#include <linux/dma/imx-dma.h>
31
32#define DRIVER_NAME "spi_imx"
33
34static bool use_dma = true;
35module_param(use_dma, bool, 0644);
36MODULE_PARM_DESC(use_dma, "Enable usage of DMA when available (default)");
37
38/* define polling limits */
39static unsigned int polling_limit_us = 30;
40module_param(polling_limit_us, uint, 0664);
41MODULE_PARM_DESC(polling_limit_us,
42 "time in us to run a transfer in polling mode\n");
43
44#define MXC_RPM_TIMEOUT 2000 /* 2000ms */
45
46#define MXC_CSPIRXDATA 0x00
47#define MXC_CSPITXDATA 0x04
48#define MXC_CSPICTRL 0x08
49#define MXC_CSPIINT 0x0c
50#define MXC_RESET 0x1c
51
52/* generic defines to abstract from the different register layouts */
53#define MXC_INT_RR (1 << 0) /* Receive data ready interrupt */
54#define MXC_INT_TE (1 << 1) /* Transmit FIFO empty interrupt */
55#define MXC_INT_RDR BIT(4) /* Receive date threshold interrupt */
56
57/* The maximum bytes that a sdma BD can transfer. */
58#define MAX_SDMA_BD_BYTES (1 << 15)
59#define MX51_ECSPI_CTRL_MAX_BURST 512
60/* The maximum bytes that IMX53_ECSPI can transfer in target mode.*/
61#define MX53_MAX_TRANSFER_BYTES 512
62
63enum spi_imx_devtype {
64 IMX1_CSPI,
65 IMX21_CSPI,
66 IMX27_CSPI,
67 IMX31_CSPI,
68 IMX35_CSPI, /* CSPI on all i.mx except above */
69 IMX51_ECSPI, /* ECSPI on i.mx51 */
70 IMX53_ECSPI, /* ECSPI on i.mx53 and later */
71};
72
73struct spi_imx_data;
74
75struct spi_imx_devtype_data {
76 void (*intctrl)(struct spi_imx_data *spi_imx, int enable);
77 int (*prepare_message)(struct spi_imx_data *spi_imx, struct spi_message *msg);
78 int (*prepare_transfer)(struct spi_imx_data *spi_imx, struct spi_device *spi,
79 struct spi_transfer *t);
80 void (*trigger)(struct spi_imx_data *spi_imx);
81 int (*rx_available)(struct spi_imx_data *spi_imx);
82 void (*reset)(struct spi_imx_data *spi_imx);
83 void (*setup_wml)(struct spi_imx_data *spi_imx);
84 void (*disable)(struct spi_imx_data *spi_imx);
85 bool has_dmamode;
86 bool has_targetmode;
87 unsigned int fifo_size;
88 bool dynamic_burst;
89 /*
90 * ERR009165 fixed or not:
91 * https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf
92 */
93 bool tx_glitch_fixed;
94 enum spi_imx_devtype devtype;
95};
96
97struct spi_imx_data {
98 struct spi_controller *controller;
99 struct device *dev;
100
101 struct completion xfer_done;
102 void __iomem *base;
103 unsigned long base_phys;
104
105 struct clk *clk_per;
106 struct clk *clk_ipg;
107 unsigned long spi_clk;
108 unsigned int spi_bus_clk;
109
110 unsigned int bits_per_word;
111 unsigned int spi_drctl;
112
113 unsigned int count, remainder;
114 void (*tx)(struct spi_imx_data *spi_imx);
115 void (*rx)(struct spi_imx_data *spi_imx);
116 void *rx_buf;
117 const void *tx_buf;
118 unsigned int txfifo; /* number of words pushed in tx FIFO */
119 unsigned int dynamic_burst;
120 bool rx_only;
121
122 /* Target mode */
123 bool target_mode;
124 bool target_aborted;
125 unsigned int target_burst;
126
127 /* DMA */
128 bool usedma;
129 u32 wml;
130 struct completion dma_rx_completion;
131 struct completion dma_tx_completion;
132
133 const struct spi_imx_devtype_data *devtype_data;
134};
135
136static inline int is_imx27_cspi(struct spi_imx_data *d)
137{
138 return d->devtype_data->devtype == IMX27_CSPI;
139}
140
141static inline int is_imx35_cspi(struct spi_imx_data *d)
142{
143 return d->devtype_data->devtype == IMX35_CSPI;
144}
145
146static inline int is_imx51_ecspi(struct spi_imx_data *d)
147{
148 return d->devtype_data->devtype == IMX51_ECSPI;
149}
150
151static inline int is_imx53_ecspi(struct spi_imx_data *d)
152{
153 return d->devtype_data->devtype == IMX53_ECSPI;
154}
155
156#define MXC_SPI_BUF_RX(type) \
157static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx) \
158{ \
159 unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); \
160 \
161 if (spi_imx->rx_buf) { \
162 *(type *)spi_imx->rx_buf = val; \
163 spi_imx->rx_buf += sizeof(type); \
164 } \
165 \
166 spi_imx->remainder -= sizeof(type); \
167}
168
169#define MXC_SPI_BUF_TX(type) \
170static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx) \
171{ \
172 type val = 0; \
173 \
174 if (spi_imx->tx_buf) { \
175 val = *(type *)spi_imx->tx_buf; \
176 spi_imx->tx_buf += sizeof(type); \
177 } \
178 \
179 spi_imx->count -= sizeof(type); \
180 \
181 writel(val, spi_imx->base + MXC_CSPITXDATA); \
182}
183
184MXC_SPI_BUF_RX(u8)
185MXC_SPI_BUF_TX(u8)
186MXC_SPI_BUF_RX(u16)
187MXC_SPI_BUF_TX(u16)
188MXC_SPI_BUF_RX(u32)
189MXC_SPI_BUF_TX(u32)
190
191/* First entry is reserved, second entry is valid only if SDHC_SPIEN is set
192 * (which is currently not the case in this driver)
193 */
194static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192,
195 256, 384, 512, 768, 1024};
196
197/* MX21, MX27 */
198static unsigned int spi_imx_clkdiv_1(unsigned int fin,
199 unsigned int fspi, unsigned int max, unsigned int *fres)
200{
201 int i;
202
203 for (i = 2; i < max; i++)
204 if (fspi * mxc_clkdivs[i] >= fin)
205 break;
206
207 *fres = fin / mxc_clkdivs[i];
208 return i;
209}
210
211/* MX1, MX31, MX35, MX51 CSPI */
212static unsigned int spi_imx_clkdiv_2(unsigned int fin,
213 unsigned int fspi, unsigned int *fres)
214{
215 int i, div = 4;
216
217 for (i = 0; i < 7; i++) {
218 if (fspi * div >= fin)
219 goto out;
220 div <<= 1;
221 }
222
223out:
224 *fres = fin / div;
225 return i;
226}
227
228static int spi_imx_bytes_per_word(const int bits_per_word)
229{
230 if (bits_per_word <= 8)
231 return 1;
232 else if (bits_per_word <= 16)
233 return 2;
234 else
235 return 4;
236}
237
238static bool spi_imx_can_dma(struct spi_controller *controller, struct spi_device *spi,
239 struct spi_transfer *transfer)
240{
241 struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
242
243 if (!use_dma || controller->fallback)
244 return false;
245
246 if (!controller->dma_rx)
247 return false;
248
249 if (spi_imx->target_mode)
250 return false;
251
252 if (transfer->len < spi_imx->devtype_data->fifo_size)
253 return false;
254
255 spi_imx->dynamic_burst = 0;
256
257 return true;
258}
259
260/*
261 * Note the number of natively supported chip selects for MX51 is 4. Some
262 * devices may have less actual SS pins but the register map supports 4. When
263 * using gpio chip selects the cs values passed into the macros below can go
264 * outside the range 0 - 3. We therefore need to limit the cs value to avoid
265 * corrupting bits outside the allocated locations.
266 *
267 * The simplest way to do this is to just mask the cs bits to 2 bits. This
268 * still allows all 4 native chip selects to work as well as gpio chip selects
269 * (which can use any of the 4 chip select configurations).
270 */
271
272#define MX51_ECSPI_CTRL 0x08
273#define MX51_ECSPI_CTRL_ENABLE (1 << 0)
274#define MX51_ECSPI_CTRL_XCH (1 << 2)
275#define MX51_ECSPI_CTRL_SMC (1 << 3)
276#define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4)
277#define MX51_ECSPI_CTRL_DRCTL(drctl) ((drctl) << 16)
278#define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8
279#define MX51_ECSPI_CTRL_PREDIV_OFFSET 12
280#define MX51_ECSPI_CTRL_CS(cs) ((cs & 3) << 18)
281#define MX51_ECSPI_CTRL_BL_OFFSET 20
282#define MX51_ECSPI_CTRL_BL_MASK (0xfff << 20)
283
284#define MX51_ECSPI_CONFIG 0x0c
285#define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs & 3) + 0))
286#define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs & 3) + 4))
287#define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs & 3) + 8))
288#define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs & 3) + 12))
289#define MX51_ECSPI_CONFIG_DATACTL(cs) (1 << ((cs & 3) + 16))
290#define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs & 3) + 20))
291
292#define MX51_ECSPI_INT 0x10
293#define MX51_ECSPI_INT_TEEN (1 << 0)
294#define MX51_ECSPI_INT_RREN (1 << 3)
295#define MX51_ECSPI_INT_RDREN (1 << 4)
296
297#define MX51_ECSPI_DMA 0x14
298#define MX51_ECSPI_DMA_TX_WML(wml) ((wml) & 0x3f)
299#define MX51_ECSPI_DMA_RX_WML(wml) (((wml) & 0x3f) << 16)
300#define MX51_ECSPI_DMA_RXT_WML(wml) (((wml) & 0x3f) << 24)
301
302#define MX51_ECSPI_DMA_TEDEN (1 << 7)
303#define MX51_ECSPI_DMA_RXDEN (1 << 23)
304#define MX51_ECSPI_DMA_RXTDEN (1 << 31)
305
306#define MX51_ECSPI_STAT 0x18
307#define MX51_ECSPI_STAT_RR (1 << 3)
308
309#define MX51_ECSPI_PERIOD 0x1c
310#define MX51_ECSPI_PERIOD_MASK 0x7fff
311/*
312 * As measured on the i.MX6, the SPI host controller inserts a 4 SPI-Clock
313 * (SCLK) delay after each burst if the PERIOD reg is 0x0. This value will be
314 * called MX51_ECSPI_PERIOD_MIN_DELAY_SCK.
315 *
316 * If the PERIOD register is != 0, the controller inserts a delay of
317 * MX51_ECSPI_PERIOD_MIN_DELAY_SCK + register value + 1 SCLK after each burst.
318 */
319#define MX51_ECSPI_PERIOD_MIN_DELAY_SCK 4
320
321#define MX51_ECSPI_TESTREG 0x20
322#define MX51_ECSPI_TESTREG_LBC BIT(31)
323
324static void spi_imx_buf_rx_swap_u32(struct spi_imx_data *spi_imx)
325{
326 unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA);
327
328 if (spi_imx->rx_buf) {
329#ifdef __LITTLE_ENDIAN
330 unsigned int bytes_per_word;
331
332 bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
333 if (bytes_per_word == 1)
334 swab32s(&val);
335 else if (bytes_per_word == 2)
336 swahw32s(&val);
337#endif
338 *(u32 *)spi_imx->rx_buf = val;
339 spi_imx->rx_buf += sizeof(u32);
340 }
341
342 spi_imx->remainder -= sizeof(u32);
343}
344
345static void spi_imx_buf_rx_swap(struct spi_imx_data *spi_imx)
346{
347 int unaligned;
348 u32 val;
349
350 unaligned = spi_imx->remainder % 4;
351
352 if (!unaligned) {
353 spi_imx_buf_rx_swap_u32(spi_imx);
354 return;
355 }
356
357 if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) {
358 spi_imx_buf_rx_u16(spi_imx);
359 return;
360 }
361
362 val = readl(spi_imx->base + MXC_CSPIRXDATA);
363
364 while (unaligned--) {
365 if (spi_imx->rx_buf) {
366 *(u8 *)spi_imx->rx_buf = (val >> (8 * unaligned)) & 0xff;
367 spi_imx->rx_buf++;
368 }
369 spi_imx->remainder--;
370 }
371}
372
373static void spi_imx_buf_tx_swap_u32(struct spi_imx_data *spi_imx)
374{
375 u32 val = 0;
376#ifdef __LITTLE_ENDIAN
377 unsigned int bytes_per_word;
378#endif
379
380 if (spi_imx->tx_buf) {
381 val = *(u32 *)spi_imx->tx_buf;
382 spi_imx->tx_buf += sizeof(u32);
383 }
384
385 spi_imx->count -= sizeof(u32);
386#ifdef __LITTLE_ENDIAN
387 bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
388
389 if (bytes_per_word == 1)
390 swab32s(&val);
391 else if (bytes_per_word == 2)
392 swahw32s(&val);
393#endif
394 writel(val, spi_imx->base + MXC_CSPITXDATA);
395}
396
397static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx)
398{
399 int unaligned;
400 u32 val = 0;
401
402 unaligned = spi_imx->count % 4;
403
404 if (!unaligned) {
405 spi_imx_buf_tx_swap_u32(spi_imx);
406 return;
407 }
408
409 if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) {
410 spi_imx_buf_tx_u16(spi_imx);
411 return;
412 }
413
414 while (unaligned--) {
415 if (spi_imx->tx_buf) {
416 val |= *(u8 *)spi_imx->tx_buf << (8 * unaligned);
417 spi_imx->tx_buf++;
418 }
419 spi_imx->count--;
420 }
421
422 writel(val, spi_imx->base + MXC_CSPITXDATA);
423}
424
425static void mx53_ecspi_rx_target(struct spi_imx_data *spi_imx)
426{
427 u32 val = ioread32be(spi_imx->base + MXC_CSPIRXDATA);
428
429 if (spi_imx->rx_buf) {
430 int n_bytes = spi_imx->target_burst % sizeof(val);
431
432 if (!n_bytes)
433 n_bytes = sizeof(val);
434
435 memcpy(spi_imx->rx_buf,
436 ((u8 *)&val) + sizeof(val) - n_bytes, n_bytes);
437
438 spi_imx->rx_buf += n_bytes;
439 spi_imx->target_burst -= n_bytes;
440 }
441
442 spi_imx->remainder -= sizeof(u32);
443}
444
445static void mx53_ecspi_tx_target(struct spi_imx_data *spi_imx)
446{
447 u32 val = 0;
448 int n_bytes = spi_imx->count % sizeof(val);
449
450 if (!n_bytes)
451 n_bytes = sizeof(val);
452
453 if (spi_imx->tx_buf) {
454 memcpy(((u8 *)&val) + sizeof(val) - n_bytes,
455 spi_imx->tx_buf, n_bytes);
456 spi_imx->tx_buf += n_bytes;
457 }
458
459 spi_imx->count -= n_bytes;
460
461 iowrite32be(val, spi_imx->base + MXC_CSPITXDATA);
462}
463
464/* MX51 eCSPI */
465static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx,
466 unsigned int fspi, unsigned int *fres)
467{
468 /*
469 * there are two 4-bit dividers, the pre-divider divides by
470 * $pre, the post-divider by 2^$post
471 */
472 unsigned int pre, post;
473 unsigned int fin = spi_imx->spi_clk;
474
475 fspi = min(fspi, fin);
476
477 post = fls(fin) - fls(fspi);
478 if (fin > fspi << post)
479 post++;
480
481 /* now we have: (fin <= fspi << post) with post being minimal */
482
483 post = max(4U, post) - 4;
484 if (unlikely(post > 0xf)) {
485 dev_err(spi_imx->dev, "cannot set clock freq: %u (base freq: %u)\n",
486 fspi, fin);
487 return 0xff;
488 }
489
490 pre = DIV_ROUND_UP(fin, fspi << post) - 1;
491
492 dev_dbg(spi_imx->dev, "%s: fin: %u, fspi: %u, post: %u, pre: %u\n",
493 __func__, fin, fspi, post, pre);
494
495 /* Resulting frequency for the SCLK line. */
496 *fres = (fin / (pre + 1)) >> post;
497
498 return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) |
499 (post << MX51_ECSPI_CTRL_POSTDIV_OFFSET);
500}
501
502static void mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
503{
504 unsigned int val = 0;
505
506 if (enable & MXC_INT_TE)
507 val |= MX51_ECSPI_INT_TEEN;
508
509 if (enable & MXC_INT_RR)
510 val |= MX51_ECSPI_INT_RREN;
511
512 if (enable & MXC_INT_RDR)
513 val |= MX51_ECSPI_INT_RDREN;
514
515 writel(val, spi_imx->base + MX51_ECSPI_INT);
516}
517
518static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
519{
520 u32 reg;
521
522 reg = readl(spi_imx->base + MX51_ECSPI_CTRL);
523 reg |= MX51_ECSPI_CTRL_XCH;
524 writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
525}
526
527static void mx51_ecspi_disable(struct spi_imx_data *spi_imx)
528{
529 u32 ctrl;
530
531 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
532 ctrl &= ~MX51_ECSPI_CTRL_ENABLE;
533 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
534}
535
536static int mx51_ecspi_channel(const struct spi_device *spi)
537{
538 if (!spi_get_csgpiod(spi, 0))
539 return spi_get_chipselect(spi, 0);
540 return spi->controller->unused_native_cs;
541}
542
543static int mx51_ecspi_prepare_message(struct spi_imx_data *spi_imx,
544 struct spi_message *msg)
545{
546 struct spi_device *spi = msg->spi;
547 struct spi_transfer *xfer;
548 u32 ctrl = MX51_ECSPI_CTRL_ENABLE;
549 u32 min_speed_hz = ~0U;
550 u32 testreg, delay;
551 u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
552 u32 current_cfg = cfg;
553 int channel = mx51_ecspi_channel(spi);
554
555 /* set Host or Target mode */
556 if (spi_imx->target_mode)
557 ctrl &= ~MX51_ECSPI_CTRL_MODE_MASK;
558 else
559 ctrl |= MX51_ECSPI_CTRL_MODE_MASK;
560
561 /*
562 * Enable SPI_RDY handling (falling edge/level triggered).
563 */
564 if (spi->mode & SPI_READY)
565 ctrl |= MX51_ECSPI_CTRL_DRCTL(spi_imx->spi_drctl);
566
567 /* set chip select to use */
568 ctrl |= MX51_ECSPI_CTRL_CS(channel);
569
570 /*
571 * The ctrl register must be written first, with the EN bit set other
572 * registers must not be written to.
573 */
574 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
575
576 testreg = readl(spi_imx->base + MX51_ECSPI_TESTREG);
577 if (spi->mode & SPI_LOOP)
578 testreg |= MX51_ECSPI_TESTREG_LBC;
579 else
580 testreg &= ~MX51_ECSPI_TESTREG_LBC;
581 writel(testreg, spi_imx->base + MX51_ECSPI_TESTREG);
582
583 /*
584 * eCSPI burst completion by Chip Select signal in Target mode
585 * is not functional for imx53 Soc, config SPI burst completed when
586 * BURST_LENGTH + 1 bits are received
587 */
588 if (spi_imx->target_mode && is_imx53_ecspi(spi_imx))
589 cfg &= ~MX51_ECSPI_CONFIG_SBBCTRL(channel);
590 else
591 cfg |= MX51_ECSPI_CONFIG_SBBCTRL(channel);
592
593 if (spi->mode & SPI_CPOL) {
594 cfg |= MX51_ECSPI_CONFIG_SCLKPOL(channel);
595 cfg |= MX51_ECSPI_CONFIG_SCLKCTL(channel);
596 } else {
597 cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(channel);
598 cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(channel);
599 }
600
601 if (spi->mode & SPI_MOSI_IDLE_LOW)
602 cfg |= MX51_ECSPI_CONFIG_DATACTL(channel);
603 else
604 cfg &= ~MX51_ECSPI_CONFIG_DATACTL(channel);
605
606 if (spi->mode & SPI_CS_HIGH)
607 cfg |= MX51_ECSPI_CONFIG_SSBPOL(channel);
608 else
609 cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(channel);
610
611 if (cfg == current_cfg)
612 return 0;
613
614 writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
615
616 /*
617 * Wait until the changes in the configuration register CONFIGREG
618 * propagate into the hardware. It takes exactly one tick of the
619 * SCLK clock, but we will wait two SCLK clock just to be sure. The
620 * effect of the delay it takes for the hardware to apply changes
621 * is noticable if the SCLK clock run very slow. In such a case, if
622 * the polarity of SCLK should be inverted, the GPIO ChipSelect might
623 * be asserted before the SCLK polarity changes, which would disrupt
624 * the SPI communication as the device on the other end would consider
625 * the change of SCLK polarity as a clock tick already.
626 *
627 * Because spi_imx->spi_bus_clk is only set in prepare_message
628 * callback, iterate over all the transfers in spi_message, find the
629 * one with lowest bus frequency, and use that bus frequency for the
630 * delay calculation. In case all transfers have speed_hz == 0, then
631 * min_speed_hz is ~0 and the resulting delay is zero.
632 */
633 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
634 if (!xfer->speed_hz)
635 continue;
636 min_speed_hz = min(xfer->speed_hz, min_speed_hz);
637 }
638
639 delay = (2 * 1000000) / min_speed_hz;
640 if (likely(delay < 10)) /* SCLK is faster than 200 kHz */
641 udelay(delay);
642 else /* SCLK is _very_ slow */
643 usleep_range(delay, delay + 10);
644
645 return 0;
646}
647
648static void mx51_configure_cpha(struct spi_imx_data *spi_imx,
649 struct spi_device *spi)
650{
651 bool cpha = (spi->mode & SPI_CPHA);
652 bool flip_cpha = (spi->mode & SPI_RX_CPHA_FLIP) && spi_imx->rx_only;
653 u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
654 int channel = mx51_ecspi_channel(spi);
655
656 /* Flip cpha logical value iff flip_cpha */
657 cpha ^= flip_cpha;
658
659 if (cpha)
660 cfg |= MX51_ECSPI_CONFIG_SCLKPHA(channel);
661 else
662 cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(channel);
663
664 writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
665}
666
667static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
668 struct spi_device *spi, struct spi_transfer *t)
669{
670 u32 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
671 u64 word_delay_sck;
672 u32 clk;
673
674 /* Clear BL field and set the right value */
675 ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
676 if (spi_imx->target_mode && is_imx53_ecspi(spi_imx))
677 ctrl |= (spi_imx->target_burst * 8 - 1)
678 << MX51_ECSPI_CTRL_BL_OFFSET;
679 else {
680 ctrl |= (spi_imx->bits_per_word - 1)
681 << MX51_ECSPI_CTRL_BL_OFFSET;
682 }
683
684 /* set clock speed */
685 ctrl &= ~(0xf << MX51_ECSPI_CTRL_POSTDIV_OFFSET |
686 0xf << MX51_ECSPI_CTRL_PREDIV_OFFSET);
687 ctrl |= mx51_ecspi_clkdiv(spi_imx, spi_imx->spi_bus_clk, &clk);
688 spi_imx->spi_bus_clk = clk;
689
690 mx51_configure_cpha(spi_imx, spi);
691
692 /*
693 * ERR009165: work in XHC mode instead of SMC as PIO on the chips
694 * before i.mx6ul.
695 */
696 if (spi_imx->usedma && spi_imx->devtype_data->tx_glitch_fixed)
697 ctrl |= MX51_ECSPI_CTRL_SMC;
698 else
699 ctrl &= ~MX51_ECSPI_CTRL_SMC;
700
701 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
702
703 /* calculate word delay in SPI Clock (SCLK) cycles */
704 if (t->word_delay.value == 0) {
705 word_delay_sck = 0;
706 } else if (t->word_delay.unit == SPI_DELAY_UNIT_SCK) {
707 word_delay_sck = t->word_delay.value;
708
709 if (word_delay_sck <= MX51_ECSPI_PERIOD_MIN_DELAY_SCK)
710 word_delay_sck = 0;
711 else if (word_delay_sck <= MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1)
712 word_delay_sck = 1;
713 else
714 word_delay_sck -= MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1;
715 } else {
716 int word_delay_ns;
717
718 word_delay_ns = spi_delay_to_ns(&t->word_delay, t);
719 if (word_delay_ns < 0)
720 return word_delay_ns;
721
722 if (word_delay_ns <= mul_u64_u32_div(NSEC_PER_SEC,
723 MX51_ECSPI_PERIOD_MIN_DELAY_SCK,
724 spi_imx->spi_bus_clk)) {
725 word_delay_sck = 0;
726 } else if (word_delay_ns <= mul_u64_u32_div(NSEC_PER_SEC,
727 MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1,
728 spi_imx->spi_bus_clk)) {
729 word_delay_sck = 1;
730 } else {
731 word_delay_ns -= mul_u64_u32_div(NSEC_PER_SEC,
732 MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1,
733 spi_imx->spi_bus_clk);
734
735 word_delay_sck = DIV_U64_ROUND_UP((u64)word_delay_ns * spi_imx->spi_bus_clk,
736 NSEC_PER_SEC);
737 }
738 }
739
740 if (!FIELD_FIT(MX51_ECSPI_PERIOD_MASK, word_delay_sck))
741 return -EINVAL;
742
743 writel(FIELD_PREP(MX51_ECSPI_PERIOD_MASK, word_delay_sck),
744 spi_imx->base + MX51_ECSPI_PERIOD);
745
746 return 0;
747}
748
749static void mx51_setup_wml(struct spi_imx_data *spi_imx)
750{
751 u32 tx_wml = 0;
752
753 if (spi_imx->devtype_data->tx_glitch_fixed)
754 tx_wml = spi_imx->wml;
755 /*
756 * Configure the DMA register: setup the watermark
757 * and enable DMA request.
758 */
759 writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml - 1) |
760 MX51_ECSPI_DMA_TX_WML(tx_wml) |
761 MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) |
762 MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN |
763 MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);
764}
765
766static int mx51_ecspi_rx_available(struct spi_imx_data *spi_imx)
767{
768 return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR;
769}
770
771static void mx51_ecspi_reset(struct spi_imx_data *spi_imx)
772{
773 /* drain receive buffer */
774 while (mx51_ecspi_rx_available(spi_imx))
775 readl(spi_imx->base + MXC_CSPIRXDATA);
776}
777
778#define MX31_INTREG_TEEN (1 << 0)
779#define MX31_INTREG_RREN (1 << 3)
780
781#define MX31_CSPICTRL_ENABLE (1 << 0)
782#define MX31_CSPICTRL_HOST (1 << 1)
783#define MX31_CSPICTRL_XCH (1 << 2)
784#define MX31_CSPICTRL_SMC (1 << 3)
785#define MX31_CSPICTRL_POL (1 << 4)
786#define MX31_CSPICTRL_PHA (1 << 5)
787#define MX31_CSPICTRL_SSCTL (1 << 6)
788#define MX31_CSPICTRL_SSPOL (1 << 7)
789#define MX31_CSPICTRL_BC_SHIFT 8
790#define MX35_CSPICTRL_BL_SHIFT 20
791#define MX31_CSPICTRL_CS_SHIFT 24
792#define MX35_CSPICTRL_CS_SHIFT 12
793#define MX31_CSPICTRL_DR_SHIFT 16
794
795#define MX31_CSPI_DMAREG 0x10
796#define MX31_DMAREG_RH_DEN (1<<4)
797#define MX31_DMAREG_TH_DEN (1<<1)
798
799#define MX31_CSPISTATUS 0x14
800#define MX31_STATUS_RR (1 << 3)
801
802#define MX31_CSPI_TESTREG 0x1C
803#define MX31_TEST_LBC (1 << 14)
804
805/* These functions also work for the i.MX35, but be aware that
806 * the i.MX35 has a slightly different register layout for bits
807 * we do not use here.
808 */
809static void mx31_intctrl(struct spi_imx_data *spi_imx, int enable)
810{
811 unsigned int val = 0;
812
813 if (enable & MXC_INT_TE)
814 val |= MX31_INTREG_TEEN;
815 if (enable & MXC_INT_RR)
816 val |= MX31_INTREG_RREN;
817
818 writel(val, spi_imx->base + MXC_CSPIINT);
819}
820
821static void mx31_trigger(struct spi_imx_data *spi_imx)
822{
823 unsigned int reg;
824
825 reg = readl(spi_imx->base + MXC_CSPICTRL);
826 reg |= MX31_CSPICTRL_XCH;
827 writel(reg, spi_imx->base + MXC_CSPICTRL);
828}
829
830static int mx31_prepare_message(struct spi_imx_data *spi_imx,
831 struct spi_message *msg)
832{
833 return 0;
834}
835
836static int mx31_prepare_transfer(struct spi_imx_data *spi_imx,
837 struct spi_device *spi, struct spi_transfer *t)
838{
839 unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_HOST;
840 unsigned int clk;
841
842 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->spi_bus_clk, &clk) <<
843 MX31_CSPICTRL_DR_SHIFT;
844 spi_imx->spi_bus_clk = clk;
845
846 if (is_imx35_cspi(spi_imx)) {
847 reg |= (spi_imx->bits_per_word - 1) << MX35_CSPICTRL_BL_SHIFT;
848 reg |= MX31_CSPICTRL_SSCTL;
849 } else {
850 reg |= (spi_imx->bits_per_word - 1) << MX31_CSPICTRL_BC_SHIFT;
851 }
852
853 if (spi->mode & SPI_CPHA)
854 reg |= MX31_CSPICTRL_PHA;
855 if (spi->mode & SPI_CPOL)
856 reg |= MX31_CSPICTRL_POL;
857 if (spi->mode & SPI_CS_HIGH)
858 reg |= MX31_CSPICTRL_SSPOL;
859 if (!spi_get_csgpiod(spi, 0))
860 reg |= (spi_get_chipselect(spi, 0)) <<
861 (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT :
862 MX31_CSPICTRL_CS_SHIFT);
863
864 if (spi_imx->usedma)
865 reg |= MX31_CSPICTRL_SMC;
866
867 writel(reg, spi_imx->base + MXC_CSPICTRL);
868
869 reg = readl(spi_imx->base + MX31_CSPI_TESTREG);
870 if (spi->mode & SPI_LOOP)
871 reg |= MX31_TEST_LBC;
872 else
873 reg &= ~MX31_TEST_LBC;
874 writel(reg, spi_imx->base + MX31_CSPI_TESTREG);
875
876 if (spi_imx->usedma) {
877 /*
878 * configure DMA requests when RXFIFO is half full and
879 * when TXFIFO is half empty
880 */
881 writel(MX31_DMAREG_RH_DEN | MX31_DMAREG_TH_DEN,
882 spi_imx->base + MX31_CSPI_DMAREG);
883 }
884
885 return 0;
886}
887
888static int mx31_rx_available(struct spi_imx_data *spi_imx)
889{
890 return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR;
891}
892
893static void mx31_reset(struct spi_imx_data *spi_imx)
894{
895 /* drain receive buffer */
896 while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR)
897 readl(spi_imx->base + MXC_CSPIRXDATA);
898}
899
900#define MX21_INTREG_RR (1 << 4)
901#define MX21_INTREG_TEEN (1 << 9)
902#define MX21_INTREG_RREN (1 << 13)
903
904#define MX21_CSPICTRL_POL (1 << 5)
905#define MX21_CSPICTRL_PHA (1 << 6)
906#define MX21_CSPICTRL_SSPOL (1 << 8)
907#define MX21_CSPICTRL_XCH (1 << 9)
908#define MX21_CSPICTRL_ENABLE (1 << 10)
909#define MX21_CSPICTRL_HOST (1 << 11)
910#define MX21_CSPICTRL_DR_SHIFT 14
911#define MX21_CSPICTRL_CS_SHIFT 19
912
913static void mx21_intctrl(struct spi_imx_data *spi_imx, int enable)
914{
915 unsigned int val = 0;
916
917 if (enable & MXC_INT_TE)
918 val |= MX21_INTREG_TEEN;
919 if (enable & MXC_INT_RR)
920 val |= MX21_INTREG_RREN;
921
922 writel(val, spi_imx->base + MXC_CSPIINT);
923}
924
925static void mx21_trigger(struct spi_imx_data *spi_imx)
926{
927 unsigned int reg;
928
929 reg = readl(spi_imx->base + MXC_CSPICTRL);
930 reg |= MX21_CSPICTRL_XCH;
931 writel(reg, spi_imx->base + MXC_CSPICTRL);
932}
933
934static int mx21_prepare_message(struct spi_imx_data *spi_imx,
935 struct spi_message *msg)
936{
937 return 0;
938}
939
940static int mx21_prepare_transfer(struct spi_imx_data *spi_imx,
941 struct spi_device *spi, struct spi_transfer *t)
942{
943 unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_HOST;
944 unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
945 unsigned int clk;
946
947 reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, spi_imx->spi_bus_clk, max, &clk)
948 << MX21_CSPICTRL_DR_SHIFT;
949 spi_imx->spi_bus_clk = clk;
950
951 reg |= spi_imx->bits_per_word - 1;
952
953 if (spi->mode & SPI_CPHA)
954 reg |= MX21_CSPICTRL_PHA;
955 if (spi->mode & SPI_CPOL)
956 reg |= MX21_CSPICTRL_POL;
957 if (spi->mode & SPI_CS_HIGH)
958 reg |= MX21_CSPICTRL_SSPOL;
959 if (!spi_get_csgpiod(spi, 0))
960 reg |= spi_get_chipselect(spi, 0) << MX21_CSPICTRL_CS_SHIFT;
961
962 writel(reg, spi_imx->base + MXC_CSPICTRL);
963
964 return 0;
965}
966
967static int mx21_rx_available(struct spi_imx_data *spi_imx)
968{
969 return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR;
970}
971
972static void mx21_reset(struct spi_imx_data *spi_imx)
973{
974 writel(1, spi_imx->base + MXC_RESET);
975}
976
977#define MX1_INTREG_RR (1 << 3)
978#define MX1_INTREG_TEEN (1 << 8)
979#define MX1_INTREG_RREN (1 << 11)
980
981#define MX1_CSPICTRL_POL (1 << 4)
982#define MX1_CSPICTRL_PHA (1 << 5)
983#define MX1_CSPICTRL_XCH (1 << 8)
984#define MX1_CSPICTRL_ENABLE (1 << 9)
985#define MX1_CSPICTRL_HOST (1 << 10)
986#define MX1_CSPICTRL_DR_SHIFT 13
987
988static void mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
989{
990 unsigned int val = 0;
991
992 if (enable & MXC_INT_TE)
993 val |= MX1_INTREG_TEEN;
994 if (enable & MXC_INT_RR)
995 val |= MX1_INTREG_RREN;
996
997 writel(val, spi_imx->base + MXC_CSPIINT);
998}
999
1000static void mx1_trigger(struct spi_imx_data *spi_imx)
1001{
1002 unsigned int reg;
1003
1004 reg = readl(spi_imx->base + MXC_CSPICTRL);
1005 reg |= MX1_CSPICTRL_XCH;
1006 writel(reg, spi_imx->base + MXC_CSPICTRL);
1007}
1008
1009static int mx1_prepare_message(struct spi_imx_data *spi_imx,
1010 struct spi_message *msg)
1011{
1012 return 0;
1013}
1014
1015static int mx1_prepare_transfer(struct spi_imx_data *spi_imx,
1016 struct spi_device *spi, struct spi_transfer *t)
1017{
1018 unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_HOST;
1019 unsigned int clk;
1020
1021 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->spi_bus_clk, &clk) <<
1022 MX1_CSPICTRL_DR_SHIFT;
1023 spi_imx->spi_bus_clk = clk;
1024
1025 reg |= spi_imx->bits_per_word - 1;
1026
1027 if (spi->mode & SPI_CPHA)
1028 reg |= MX1_CSPICTRL_PHA;
1029 if (spi->mode & SPI_CPOL)
1030 reg |= MX1_CSPICTRL_POL;
1031
1032 writel(reg, spi_imx->base + MXC_CSPICTRL);
1033
1034 return 0;
1035}
1036
1037static int mx1_rx_available(struct spi_imx_data *spi_imx)
1038{
1039 return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR;
1040}
1041
1042static void mx1_reset(struct spi_imx_data *spi_imx)
1043{
1044 writel(1, spi_imx->base + MXC_RESET);
1045}
1046
1047static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
1048 .intctrl = mx1_intctrl,
1049 .prepare_message = mx1_prepare_message,
1050 .prepare_transfer = mx1_prepare_transfer,
1051 .trigger = mx1_trigger,
1052 .rx_available = mx1_rx_available,
1053 .reset = mx1_reset,
1054 .fifo_size = 8,
1055 .has_dmamode = false,
1056 .dynamic_burst = false,
1057 .has_targetmode = false,
1058 .devtype = IMX1_CSPI,
1059};
1060
1061static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
1062 .intctrl = mx21_intctrl,
1063 .prepare_message = mx21_prepare_message,
1064 .prepare_transfer = mx21_prepare_transfer,
1065 .trigger = mx21_trigger,
1066 .rx_available = mx21_rx_available,
1067 .reset = mx21_reset,
1068 .fifo_size = 8,
1069 .has_dmamode = false,
1070 .dynamic_burst = false,
1071 .has_targetmode = false,
1072 .devtype = IMX21_CSPI,
1073};
1074
1075static struct spi_imx_devtype_data imx27_cspi_devtype_data = {
1076 /* i.mx27 cspi shares the functions with i.mx21 one */
1077 .intctrl = mx21_intctrl,
1078 .prepare_message = mx21_prepare_message,
1079 .prepare_transfer = mx21_prepare_transfer,
1080 .trigger = mx21_trigger,
1081 .rx_available = mx21_rx_available,
1082 .reset = mx21_reset,
1083 .fifo_size = 8,
1084 .has_dmamode = false,
1085 .dynamic_burst = false,
1086 .has_targetmode = false,
1087 .devtype = IMX27_CSPI,
1088};
1089
1090static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
1091 .intctrl = mx31_intctrl,
1092 .prepare_message = mx31_prepare_message,
1093 .prepare_transfer = mx31_prepare_transfer,
1094 .trigger = mx31_trigger,
1095 .rx_available = mx31_rx_available,
1096 .reset = mx31_reset,
1097 .fifo_size = 8,
1098 .has_dmamode = false,
1099 .dynamic_burst = false,
1100 .has_targetmode = false,
1101 .devtype = IMX31_CSPI,
1102};
1103
1104static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
1105 /* i.mx35 and later cspi shares the functions with i.mx31 one */
1106 .intctrl = mx31_intctrl,
1107 .prepare_message = mx31_prepare_message,
1108 .prepare_transfer = mx31_prepare_transfer,
1109 .trigger = mx31_trigger,
1110 .rx_available = mx31_rx_available,
1111 .reset = mx31_reset,
1112 .fifo_size = 8,
1113 .has_dmamode = false,
1114 .dynamic_burst = false,
1115 .has_targetmode = false,
1116 .devtype = IMX35_CSPI,
1117};
1118
1119static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
1120 .intctrl = mx51_ecspi_intctrl,
1121 .prepare_message = mx51_ecspi_prepare_message,
1122 .prepare_transfer = mx51_ecspi_prepare_transfer,
1123 .trigger = mx51_ecspi_trigger,
1124 .rx_available = mx51_ecspi_rx_available,
1125 .reset = mx51_ecspi_reset,
1126 .setup_wml = mx51_setup_wml,
1127 .fifo_size = 64,
1128 .has_dmamode = true,
1129 .dynamic_burst = true,
1130 .has_targetmode = true,
1131 .disable = mx51_ecspi_disable,
1132 .devtype = IMX51_ECSPI,
1133};
1134
1135static struct spi_imx_devtype_data imx53_ecspi_devtype_data = {
1136 .intctrl = mx51_ecspi_intctrl,
1137 .prepare_message = mx51_ecspi_prepare_message,
1138 .prepare_transfer = mx51_ecspi_prepare_transfer,
1139 .trigger = mx51_ecspi_trigger,
1140 .rx_available = mx51_ecspi_rx_available,
1141 .reset = mx51_ecspi_reset,
1142 .fifo_size = 64,
1143 .has_dmamode = true,
1144 .has_targetmode = true,
1145 .disable = mx51_ecspi_disable,
1146 .devtype = IMX53_ECSPI,
1147};
1148
1149static struct spi_imx_devtype_data imx6ul_ecspi_devtype_data = {
1150 .intctrl = mx51_ecspi_intctrl,
1151 .prepare_message = mx51_ecspi_prepare_message,
1152 .prepare_transfer = mx51_ecspi_prepare_transfer,
1153 .trigger = mx51_ecspi_trigger,
1154 .rx_available = mx51_ecspi_rx_available,
1155 .reset = mx51_ecspi_reset,
1156 .setup_wml = mx51_setup_wml,
1157 .fifo_size = 64,
1158 .has_dmamode = true,
1159 .dynamic_burst = true,
1160 .has_targetmode = true,
1161 .tx_glitch_fixed = true,
1162 .disable = mx51_ecspi_disable,
1163 .devtype = IMX51_ECSPI,
1164};
1165
1166static const struct of_device_id spi_imx_dt_ids[] = {
1167 { .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
1168 { .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
1169 { .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
1170 { .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
1171 { .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
1172 { .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
1173 { .compatible = "fsl,imx53-ecspi", .data = &imx53_ecspi_devtype_data, },
1174 { .compatible = "fsl,imx6ul-ecspi", .data = &imx6ul_ecspi_devtype_data, },
1175 { /* sentinel */ }
1176};
1177MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);
1178
1179static void spi_imx_set_burst_len(struct spi_imx_data *spi_imx, int n_bits)
1180{
1181 u32 ctrl;
1182
1183 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
1184 ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
1185 ctrl |= ((n_bits - 1) << MX51_ECSPI_CTRL_BL_OFFSET);
1186 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
1187}
1188
1189static void spi_imx_push(struct spi_imx_data *spi_imx)
1190{
1191 unsigned int burst_len;
1192
1193 /*
1194 * Reload the FIFO when the remaining bytes to be transferred in the
1195 * current burst is 0. This only applies when bits_per_word is a
1196 * multiple of 8.
1197 */
1198 if (!spi_imx->remainder) {
1199 if (spi_imx->dynamic_burst) {
1200
1201 /* We need to deal unaligned data first */
1202 burst_len = spi_imx->count % MX51_ECSPI_CTRL_MAX_BURST;
1203
1204 if (!burst_len)
1205 burst_len = MX51_ECSPI_CTRL_MAX_BURST;
1206
1207 spi_imx_set_burst_len(spi_imx, burst_len * 8);
1208
1209 spi_imx->remainder = burst_len;
1210 } else {
1211 spi_imx->remainder = spi_imx_bytes_per_word(spi_imx->bits_per_word);
1212 }
1213 }
1214
1215 while (spi_imx->txfifo < spi_imx->devtype_data->fifo_size) {
1216 if (!spi_imx->count)
1217 break;
1218 if (spi_imx->dynamic_burst &&
1219 spi_imx->txfifo >= DIV_ROUND_UP(spi_imx->remainder, 4))
1220 break;
1221 spi_imx->tx(spi_imx);
1222 spi_imx->txfifo++;
1223 }
1224
1225 if (!spi_imx->target_mode)
1226 spi_imx->devtype_data->trigger(spi_imx);
1227}
1228
1229static irqreturn_t spi_imx_isr(int irq, void *dev_id)
1230{
1231 struct spi_imx_data *spi_imx = dev_id;
1232
1233 while (spi_imx->txfifo &&
1234 spi_imx->devtype_data->rx_available(spi_imx)) {
1235 spi_imx->rx(spi_imx);
1236 spi_imx->txfifo--;
1237 }
1238
1239 if (spi_imx->count) {
1240 spi_imx_push(spi_imx);
1241 return IRQ_HANDLED;
1242 }
1243
1244 if (spi_imx->txfifo) {
1245 /* No data left to push, but still waiting for rx data,
1246 * enable receive data available interrupt.
1247 */
1248 spi_imx->devtype_data->intctrl(
1249 spi_imx, MXC_INT_RR);
1250 return IRQ_HANDLED;
1251 }
1252
1253 spi_imx->devtype_data->intctrl(spi_imx, 0);
1254 complete(&spi_imx->xfer_done);
1255
1256 return IRQ_HANDLED;
1257}
1258
1259static int spi_imx_dma_configure(struct spi_controller *controller)
1260{
1261 int ret;
1262 enum dma_slave_buswidth buswidth;
1263 struct dma_slave_config rx = {}, tx = {};
1264 struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1265
1266 switch (spi_imx_bytes_per_word(spi_imx->bits_per_word)) {
1267 case 4:
1268 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
1269 break;
1270 case 2:
1271 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
1272 break;
1273 case 1:
1274 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
1275 break;
1276 default:
1277 return -EINVAL;
1278 }
1279
1280 tx.direction = DMA_MEM_TO_DEV;
1281 tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA;
1282 tx.dst_addr_width = buswidth;
1283 tx.dst_maxburst = spi_imx->wml;
1284 ret = dmaengine_slave_config(controller->dma_tx, &tx);
1285 if (ret) {
1286 dev_err(spi_imx->dev, "TX dma configuration failed with %d\n", ret);
1287 return ret;
1288 }
1289
1290 rx.direction = DMA_DEV_TO_MEM;
1291 rx.src_addr = spi_imx->base_phys + MXC_CSPIRXDATA;
1292 rx.src_addr_width = buswidth;
1293 rx.src_maxburst = spi_imx->wml;
1294 ret = dmaengine_slave_config(controller->dma_rx, &rx);
1295 if (ret) {
1296 dev_err(spi_imx->dev, "RX dma configuration failed with %d\n", ret);
1297 return ret;
1298 }
1299
1300 return 0;
1301}
1302
1303static int spi_imx_setupxfer(struct spi_device *spi,
1304 struct spi_transfer *t)
1305{
1306 struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1307
1308 if (!t)
1309 return 0;
1310
1311 if (!t->speed_hz) {
1312 if (!spi->max_speed_hz) {
1313 dev_err(&spi->dev, "no speed_hz provided!\n");
1314 return -EINVAL;
1315 }
1316 dev_dbg(&spi->dev, "using spi->max_speed_hz!\n");
1317 spi_imx->spi_bus_clk = spi->max_speed_hz;
1318 } else
1319 spi_imx->spi_bus_clk = t->speed_hz;
1320
1321 spi_imx->bits_per_word = t->bits_per_word;
1322 spi_imx->count = t->len;
1323
1324 /*
1325 * Initialize the functions for transfer. To transfer non byte-aligned
1326 * words, we have to use multiple word-size bursts. To insert word
1327 * delay, the burst size has to equal the word size. We can't use
1328 * dynamic_burst in these cases.
1329 */
1330 if (spi_imx->devtype_data->dynamic_burst && !spi_imx->target_mode &&
1331 !(spi->mode & SPI_CS_WORD) &&
1332 !(t->word_delay.value) &&
1333 (spi_imx->bits_per_word == 8 ||
1334 spi_imx->bits_per_word == 16 ||
1335 spi_imx->bits_per_word == 32)) {
1336
1337 spi_imx->rx = spi_imx_buf_rx_swap;
1338 spi_imx->tx = spi_imx_buf_tx_swap;
1339 spi_imx->dynamic_burst = 1;
1340
1341 } else {
1342 if (spi_imx->bits_per_word <= 8) {
1343 spi_imx->rx = spi_imx_buf_rx_u8;
1344 spi_imx->tx = spi_imx_buf_tx_u8;
1345 } else if (spi_imx->bits_per_word <= 16) {
1346 spi_imx->rx = spi_imx_buf_rx_u16;
1347 spi_imx->tx = spi_imx_buf_tx_u16;
1348 } else {
1349 spi_imx->rx = spi_imx_buf_rx_u32;
1350 spi_imx->tx = spi_imx_buf_tx_u32;
1351 }
1352 spi_imx->dynamic_burst = 0;
1353 }
1354
1355 if (spi_imx_can_dma(spi_imx->controller, spi, t))
1356 spi_imx->usedma = true;
1357 else
1358 spi_imx->usedma = false;
1359
1360 spi_imx->rx_only = ((t->tx_buf == NULL)
1361 || (t->tx_buf == spi->controller->dummy_tx));
1362
1363 if (is_imx53_ecspi(spi_imx) && spi_imx->target_mode) {
1364 spi_imx->rx = mx53_ecspi_rx_target;
1365 spi_imx->tx = mx53_ecspi_tx_target;
1366 spi_imx->target_burst = t->len;
1367 }
1368
1369 spi_imx->devtype_data->prepare_transfer(spi_imx, spi, t);
1370
1371 return 0;
1372}
1373
1374static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
1375{
1376 struct spi_controller *controller = spi_imx->controller;
1377
1378 if (controller->dma_rx) {
1379 dma_release_channel(controller->dma_rx);
1380 controller->dma_rx = NULL;
1381 }
1382
1383 if (controller->dma_tx) {
1384 dma_release_channel(controller->dma_tx);
1385 controller->dma_tx = NULL;
1386 }
1387}
1388
1389static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
1390 struct spi_controller *controller)
1391{
1392 int ret;
1393
1394 spi_imx->wml = spi_imx->devtype_data->fifo_size / 2;
1395
1396 /* Prepare for TX DMA: */
1397 controller->dma_tx = dma_request_chan(dev, "tx");
1398 if (IS_ERR(controller->dma_tx)) {
1399 ret = PTR_ERR(controller->dma_tx);
1400 dev_err_probe(dev, ret, "can't get the TX DMA channel!\n");
1401 controller->dma_tx = NULL;
1402 goto err;
1403 }
1404
1405 /* Prepare for RX : */
1406 controller->dma_rx = dma_request_chan(dev, "rx");
1407 if (IS_ERR(controller->dma_rx)) {
1408 ret = PTR_ERR(controller->dma_rx);
1409 dev_err_probe(dev, ret, "can't get the RX DMA channel!\n");
1410 controller->dma_rx = NULL;
1411 goto err;
1412 }
1413
1414 init_completion(&spi_imx->dma_rx_completion);
1415 init_completion(&spi_imx->dma_tx_completion);
1416 controller->can_dma = spi_imx_can_dma;
1417 controller->max_dma_len = MAX_SDMA_BD_BYTES;
1418 spi_imx->controller->flags = SPI_CONTROLLER_MUST_RX |
1419 SPI_CONTROLLER_MUST_TX;
1420
1421 return 0;
1422err:
1423 spi_imx_sdma_exit(spi_imx);
1424 return ret;
1425}
1426
1427static void spi_imx_dma_rx_callback(void *cookie)
1428{
1429 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
1430
1431 complete(&spi_imx->dma_rx_completion);
1432}
1433
1434static void spi_imx_dma_tx_callback(void *cookie)
1435{
1436 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
1437
1438 complete(&spi_imx->dma_tx_completion);
1439}
1440
1441static int spi_imx_calculate_timeout(struct spi_imx_data *spi_imx, int size)
1442{
1443 unsigned long timeout = 0;
1444
1445 /* Time with actual data transfer and CS change delay related to HW */
1446 timeout = (8 + 4) * size / spi_imx->spi_bus_clk;
1447
1448 /* Add extra second for scheduler related activities */
1449 timeout += 1;
1450
1451 /* Double calculated timeout */
1452 return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC);
1453}
1454
1455static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
1456 struct spi_transfer *transfer)
1457{
1458 struct dma_async_tx_descriptor *desc_tx, *desc_rx;
1459 unsigned long transfer_timeout;
1460 unsigned long time_left;
1461 struct spi_controller *controller = spi_imx->controller;
1462 struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
1463 struct scatterlist *last_sg = sg_last(rx->sgl, rx->nents);
1464 unsigned int bytes_per_word, i;
1465 int ret;
1466
1467 /* Get the right burst length from the last sg to ensure no tail data */
1468 bytes_per_word = spi_imx_bytes_per_word(transfer->bits_per_word);
1469 for (i = spi_imx->devtype_data->fifo_size / 2; i > 0; i--) {
1470 if (!(sg_dma_len(last_sg) % (i * bytes_per_word)))
1471 break;
1472 }
1473 /* Use 1 as wml in case no available burst length got */
1474 if (i == 0)
1475 i = 1;
1476
1477 spi_imx->wml = i;
1478
1479 ret = spi_imx_dma_configure(controller);
1480 if (ret)
1481 goto dma_failure_no_start;
1482
1483 if (!spi_imx->devtype_data->setup_wml) {
1484 dev_err(spi_imx->dev, "No setup_wml()?\n");
1485 ret = -EINVAL;
1486 goto dma_failure_no_start;
1487 }
1488 spi_imx->devtype_data->setup_wml(spi_imx);
1489
1490 /*
1491 * The TX DMA setup starts the transfer, so make sure RX is configured
1492 * before TX.
1493 */
1494 desc_rx = dmaengine_prep_slave_sg(controller->dma_rx,
1495 rx->sgl, rx->nents, DMA_DEV_TO_MEM,
1496 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1497 if (!desc_rx) {
1498 ret = -EINVAL;
1499 goto dma_failure_no_start;
1500 }
1501
1502 desc_rx->callback = spi_imx_dma_rx_callback;
1503 desc_rx->callback_param = (void *)spi_imx;
1504 dmaengine_submit(desc_rx);
1505 reinit_completion(&spi_imx->dma_rx_completion);
1506 dma_async_issue_pending(controller->dma_rx);
1507
1508 desc_tx = dmaengine_prep_slave_sg(controller->dma_tx,
1509 tx->sgl, tx->nents, DMA_MEM_TO_DEV,
1510 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1511 if (!desc_tx) {
1512 dmaengine_terminate_all(controller->dma_tx);
1513 dmaengine_terminate_all(controller->dma_rx);
1514 return -EINVAL;
1515 }
1516
1517 desc_tx->callback = spi_imx_dma_tx_callback;
1518 desc_tx->callback_param = (void *)spi_imx;
1519 dmaengine_submit(desc_tx);
1520 reinit_completion(&spi_imx->dma_tx_completion);
1521 dma_async_issue_pending(controller->dma_tx);
1522
1523 transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1524
1525 /* Wait SDMA to finish the data transfer.*/
1526 time_left = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
1527 transfer_timeout);
1528 if (!time_left) {
1529 dev_err(spi_imx->dev, "I/O Error in DMA TX\n");
1530 dmaengine_terminate_all(controller->dma_tx);
1531 dmaengine_terminate_all(controller->dma_rx);
1532 return -ETIMEDOUT;
1533 }
1534
1535 time_left = wait_for_completion_timeout(&spi_imx->dma_rx_completion,
1536 transfer_timeout);
1537 if (!time_left) {
1538 dev_err(&controller->dev, "I/O Error in DMA RX\n");
1539 spi_imx->devtype_data->reset(spi_imx);
1540 dmaengine_terminate_all(controller->dma_rx);
1541 return -ETIMEDOUT;
1542 }
1543
1544 return 0;
1545/* fallback to pio */
1546dma_failure_no_start:
1547 transfer->error |= SPI_TRANS_FAIL_NO_START;
1548 return ret;
1549}
1550
1551static int spi_imx_pio_transfer(struct spi_device *spi,
1552 struct spi_transfer *transfer)
1553{
1554 struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1555 unsigned long transfer_timeout;
1556 unsigned long time_left;
1557
1558 spi_imx->tx_buf = transfer->tx_buf;
1559 spi_imx->rx_buf = transfer->rx_buf;
1560 spi_imx->count = transfer->len;
1561 spi_imx->txfifo = 0;
1562 spi_imx->remainder = 0;
1563
1564 reinit_completion(&spi_imx->xfer_done);
1565
1566 spi_imx_push(spi_imx);
1567
1568 spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE);
1569
1570 transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1571
1572 time_left = wait_for_completion_timeout(&spi_imx->xfer_done,
1573 transfer_timeout);
1574 if (!time_left) {
1575 dev_err(&spi->dev, "I/O Error in PIO\n");
1576 spi_imx->devtype_data->reset(spi_imx);
1577 return -ETIMEDOUT;
1578 }
1579
1580 return 0;
1581}
1582
1583static int spi_imx_poll_transfer(struct spi_device *spi,
1584 struct spi_transfer *transfer)
1585{
1586 struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1587 unsigned long timeout;
1588
1589 spi_imx->tx_buf = transfer->tx_buf;
1590 spi_imx->rx_buf = transfer->rx_buf;
1591 spi_imx->count = transfer->len;
1592 spi_imx->txfifo = 0;
1593 spi_imx->remainder = 0;
1594
1595 /* fill in the fifo before timeout calculations if we are
1596 * interrupted here, then the data is getting transferred by
1597 * the HW while we are interrupted
1598 */
1599 spi_imx_push(spi_imx);
1600
1601 timeout = spi_imx_calculate_timeout(spi_imx, transfer->len) + jiffies;
1602 while (spi_imx->txfifo) {
1603 /* RX */
1604 while (spi_imx->txfifo &&
1605 spi_imx->devtype_data->rx_available(spi_imx)) {
1606 spi_imx->rx(spi_imx);
1607 spi_imx->txfifo--;
1608 }
1609
1610 /* TX */
1611 if (spi_imx->count) {
1612 spi_imx_push(spi_imx);
1613 continue;
1614 }
1615
1616 if (spi_imx->txfifo &&
1617 time_after(jiffies, timeout)) {
1618
1619 dev_err_ratelimited(&spi->dev,
1620 "timeout period reached: jiffies: %lu- falling back to interrupt mode\n",
1621 jiffies - timeout);
1622
1623 /* fall back to interrupt mode */
1624 return spi_imx_pio_transfer(spi, transfer);
1625 }
1626 }
1627
1628 return 0;
1629}
1630
1631static int spi_imx_pio_transfer_target(struct spi_device *spi,
1632 struct spi_transfer *transfer)
1633{
1634 struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1635 int ret = 0;
1636
1637 if (is_imx53_ecspi(spi_imx) &&
1638 transfer->len > MX53_MAX_TRANSFER_BYTES) {
1639 dev_err(&spi->dev, "Transaction too big, max size is %d bytes\n",
1640 MX53_MAX_TRANSFER_BYTES);
1641 return -EMSGSIZE;
1642 }
1643
1644 spi_imx->tx_buf = transfer->tx_buf;
1645 spi_imx->rx_buf = transfer->rx_buf;
1646 spi_imx->count = transfer->len;
1647 spi_imx->txfifo = 0;
1648 spi_imx->remainder = 0;
1649
1650 reinit_completion(&spi_imx->xfer_done);
1651 spi_imx->target_aborted = false;
1652
1653 spi_imx_push(spi_imx);
1654
1655 spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE | MXC_INT_RDR);
1656
1657 if (wait_for_completion_interruptible(&spi_imx->xfer_done) ||
1658 spi_imx->target_aborted) {
1659 dev_dbg(&spi->dev, "interrupted\n");
1660 ret = -EINTR;
1661 }
1662
1663 /* ecspi has a HW issue when works in Target mode,
1664 * after 64 words writtern to TXFIFO, even TXFIFO becomes empty,
1665 * ECSPI_TXDATA keeps shift out the last word data,
1666 * so we have to disable ECSPI when in target mode after the
1667 * transfer completes
1668 */
1669 if (spi_imx->devtype_data->disable)
1670 spi_imx->devtype_data->disable(spi_imx);
1671
1672 return ret;
1673}
1674
1675static unsigned int spi_imx_transfer_estimate_time_us(struct spi_transfer *transfer)
1676{
1677 u64 result;
1678
1679 result = DIV_U64_ROUND_CLOSEST((u64)USEC_PER_SEC * transfer->len * BITS_PER_BYTE,
1680 transfer->effective_speed_hz);
1681 if (transfer->word_delay.value) {
1682 unsigned int word_delay_us;
1683 unsigned int words;
1684
1685 words = DIV_ROUND_UP(transfer->len * BITS_PER_BYTE, transfer->bits_per_word);
1686 word_delay_us = DIV_ROUND_CLOSEST(spi_delay_to_ns(&transfer->word_delay, transfer),
1687 NSEC_PER_USEC);
1688 result += (u64)words * word_delay_us;
1689 }
1690
1691 return min(result, U32_MAX);
1692}
1693
1694static int spi_imx_transfer_one(struct spi_controller *controller,
1695 struct spi_device *spi,
1696 struct spi_transfer *transfer)
1697{
1698 struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1699
1700 spi_imx_setupxfer(spi, transfer);
1701 transfer->effective_speed_hz = spi_imx->spi_bus_clk;
1702
1703 /* flush rxfifo before transfer */
1704 while (spi_imx->devtype_data->rx_available(spi_imx))
1705 readl(spi_imx->base + MXC_CSPIRXDATA);
1706
1707 if (spi_imx->target_mode)
1708 return spi_imx_pio_transfer_target(spi, transfer);
1709
1710 /*
1711 * If we decided in spi_imx_can_dma() that we want to do a DMA
1712 * transfer, the SPI transfer has already been mapped, so we
1713 * have to do the DMA transfer here.
1714 */
1715 if (spi_imx->usedma)
1716 return spi_imx_dma_transfer(spi_imx, transfer);
1717
1718 /* run in polling mode for short transfers */
1719 if (transfer->len == 1 || (polling_limit_us &&
1720 spi_imx_transfer_estimate_time_us(transfer) < polling_limit_us))
1721 return spi_imx_poll_transfer(spi, transfer);
1722
1723 return spi_imx_pio_transfer(spi, transfer);
1724}
1725
1726static int spi_imx_setup(struct spi_device *spi)
1727{
1728 dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__,
1729 spi->mode, spi->bits_per_word, spi->max_speed_hz);
1730
1731 return 0;
1732}
1733
1734static int
1735spi_imx_prepare_message(struct spi_controller *controller, struct spi_message *msg)
1736{
1737 struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1738 int ret;
1739
1740 ret = pm_runtime_resume_and_get(spi_imx->dev);
1741 if (ret < 0) {
1742 dev_err(spi_imx->dev, "failed to enable clock\n");
1743 return ret;
1744 }
1745
1746 ret = spi_imx->devtype_data->prepare_message(spi_imx, msg);
1747 if (ret) {
1748 pm_runtime_mark_last_busy(spi_imx->dev);
1749 pm_runtime_put_autosuspend(spi_imx->dev);
1750 }
1751
1752 return ret;
1753}
1754
1755static int
1756spi_imx_unprepare_message(struct spi_controller *controller, struct spi_message *msg)
1757{
1758 struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1759
1760 pm_runtime_mark_last_busy(spi_imx->dev);
1761 pm_runtime_put_autosuspend(spi_imx->dev);
1762 return 0;
1763}
1764
1765static int spi_imx_target_abort(struct spi_controller *controller)
1766{
1767 struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1768
1769 spi_imx->target_aborted = true;
1770 complete(&spi_imx->xfer_done);
1771
1772 return 0;
1773}
1774
1775static int spi_imx_probe(struct platform_device *pdev)
1776{
1777 struct device_node *np = pdev->dev.of_node;
1778 struct spi_controller *controller;
1779 struct spi_imx_data *spi_imx;
1780 struct resource *res;
1781 int ret, irq, spi_drctl;
1782 const struct spi_imx_devtype_data *devtype_data =
1783 of_device_get_match_data(&pdev->dev);
1784 bool target_mode;
1785 u32 val;
1786
1787 target_mode = devtype_data->has_targetmode &&
1788 of_property_read_bool(np, "spi-slave");
1789 if (target_mode)
1790 controller = spi_alloc_target(&pdev->dev,
1791 sizeof(struct spi_imx_data));
1792 else
1793 controller = spi_alloc_host(&pdev->dev,
1794 sizeof(struct spi_imx_data));
1795 if (!controller)
1796 return -ENOMEM;
1797
1798 ret = of_property_read_u32(np, "fsl,spi-rdy-drctl", &spi_drctl);
1799 if ((ret < 0) || (spi_drctl >= 0x3)) {
1800 /* '11' is reserved */
1801 spi_drctl = 0;
1802 }
1803
1804 platform_set_drvdata(pdev, controller);
1805
1806 controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
1807 controller->bus_num = np ? -1 : pdev->id;
1808 controller->use_gpio_descriptors = true;
1809
1810 spi_imx = spi_controller_get_devdata(controller);
1811 spi_imx->controller = controller;
1812 spi_imx->dev = &pdev->dev;
1813 spi_imx->target_mode = target_mode;
1814
1815 spi_imx->devtype_data = devtype_data;
1816
1817 /*
1818 * Get number of chip selects from device properties. This can be
1819 * coming from device tree or boardfiles, if it is not defined,
1820 * a default value of 3 chip selects will be used, as all the legacy
1821 * board files have <= 3 chip selects.
1822 */
1823 if (!device_property_read_u32(&pdev->dev, "num-cs", &val))
1824 controller->num_chipselect = val;
1825 else
1826 controller->num_chipselect = 3;
1827
1828 controller->transfer_one = spi_imx_transfer_one;
1829 controller->setup = spi_imx_setup;
1830 controller->prepare_message = spi_imx_prepare_message;
1831 controller->unprepare_message = spi_imx_unprepare_message;
1832 controller->target_abort = spi_imx_target_abort;
1833 controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_NO_CS |
1834 SPI_MOSI_IDLE_LOW;
1835
1836 if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) ||
1837 is_imx53_ecspi(spi_imx))
1838 controller->mode_bits |= SPI_LOOP | SPI_READY;
1839
1840 if (is_imx51_ecspi(spi_imx) || is_imx53_ecspi(spi_imx))
1841 controller->mode_bits |= SPI_RX_CPHA_FLIP;
1842
1843 if (is_imx51_ecspi(spi_imx) &&
1844 device_property_read_u32(&pdev->dev, "cs-gpios", NULL))
1845 /*
1846 * When using HW-CS implementing SPI_CS_WORD can be done by just
1847 * setting the burst length to the word size. This is
1848 * considerably faster than manually controlling the CS.
1849 */
1850 controller->mode_bits |= SPI_CS_WORD;
1851
1852 if (is_imx51_ecspi(spi_imx) || is_imx53_ecspi(spi_imx)) {
1853 controller->max_native_cs = 4;
1854 controller->flags |= SPI_CONTROLLER_GPIO_SS;
1855 }
1856
1857 spi_imx->spi_drctl = spi_drctl;
1858
1859 init_completion(&spi_imx->xfer_done);
1860
1861 spi_imx->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
1862 if (IS_ERR(spi_imx->base)) {
1863 ret = PTR_ERR(spi_imx->base);
1864 goto out_controller_put;
1865 }
1866 spi_imx->base_phys = res->start;
1867
1868 irq = platform_get_irq(pdev, 0);
1869 if (irq < 0) {
1870 ret = irq;
1871 goto out_controller_put;
1872 }
1873
1874 ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0,
1875 dev_name(&pdev->dev), spi_imx);
1876 if (ret) {
1877 dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
1878 goto out_controller_put;
1879 }
1880
1881 spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1882 if (IS_ERR(spi_imx->clk_ipg)) {
1883 ret = PTR_ERR(spi_imx->clk_ipg);
1884 goto out_controller_put;
1885 }
1886
1887 spi_imx->clk_per = devm_clk_get(&pdev->dev, "per");
1888 if (IS_ERR(spi_imx->clk_per)) {
1889 ret = PTR_ERR(spi_imx->clk_per);
1890 goto out_controller_put;
1891 }
1892
1893 ret = clk_prepare_enable(spi_imx->clk_per);
1894 if (ret)
1895 goto out_controller_put;
1896
1897 ret = clk_prepare_enable(spi_imx->clk_ipg);
1898 if (ret)
1899 goto out_put_per;
1900
1901 pm_runtime_set_autosuspend_delay(spi_imx->dev, MXC_RPM_TIMEOUT);
1902 pm_runtime_use_autosuspend(spi_imx->dev);
1903 pm_runtime_get_noresume(spi_imx->dev);
1904 pm_runtime_set_active(spi_imx->dev);
1905 pm_runtime_enable(spi_imx->dev);
1906
1907 spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
1908 /*
1909 * Only validated on i.mx35 and i.mx6 now, can remove the constraint
1910 * if validated on other chips.
1911 */
1912 if (spi_imx->devtype_data->has_dmamode) {
1913 ret = spi_imx_sdma_init(&pdev->dev, spi_imx, controller);
1914 if (ret == -EPROBE_DEFER)
1915 goto out_runtime_pm_put;
1916
1917 if (ret < 0)
1918 dev_dbg(&pdev->dev, "dma setup error %d, use pio\n",
1919 ret);
1920 }
1921
1922 spi_imx->devtype_data->reset(spi_imx);
1923
1924 spi_imx->devtype_data->intctrl(spi_imx, 0);
1925
1926 controller->dev.of_node = pdev->dev.of_node;
1927 ret = spi_register_controller(controller);
1928 if (ret) {
1929 dev_err_probe(&pdev->dev, ret, "register controller failed\n");
1930 goto out_register_controller;
1931 }
1932
1933 pm_runtime_mark_last_busy(spi_imx->dev);
1934 pm_runtime_put_autosuspend(spi_imx->dev);
1935
1936 return ret;
1937
1938out_register_controller:
1939 if (spi_imx->devtype_data->has_dmamode)
1940 spi_imx_sdma_exit(spi_imx);
1941out_runtime_pm_put:
1942 pm_runtime_dont_use_autosuspend(spi_imx->dev);
1943 pm_runtime_disable(spi_imx->dev);
1944 pm_runtime_set_suspended(&pdev->dev);
1945
1946 clk_disable_unprepare(spi_imx->clk_ipg);
1947out_put_per:
1948 clk_disable_unprepare(spi_imx->clk_per);
1949out_controller_put:
1950 spi_controller_put(controller);
1951
1952 return ret;
1953}
1954
1955static void spi_imx_remove(struct platform_device *pdev)
1956{
1957 struct spi_controller *controller = platform_get_drvdata(pdev);
1958 struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1959 int ret;
1960
1961 spi_unregister_controller(controller);
1962
1963 ret = pm_runtime_get_sync(spi_imx->dev);
1964 if (ret >= 0)
1965 writel(0, spi_imx->base + MXC_CSPICTRL);
1966 else
1967 dev_warn(spi_imx->dev, "failed to enable clock, skip hw disable\n");
1968
1969 pm_runtime_dont_use_autosuspend(spi_imx->dev);
1970 pm_runtime_put_sync(spi_imx->dev);
1971 pm_runtime_disable(spi_imx->dev);
1972
1973 spi_imx_sdma_exit(spi_imx);
1974}
1975
1976static int spi_imx_runtime_resume(struct device *dev)
1977{
1978 struct spi_controller *controller = dev_get_drvdata(dev);
1979 struct spi_imx_data *spi_imx;
1980 int ret;
1981
1982 spi_imx = spi_controller_get_devdata(controller);
1983
1984 ret = clk_prepare_enable(spi_imx->clk_per);
1985 if (ret)
1986 return ret;
1987
1988 ret = clk_prepare_enable(spi_imx->clk_ipg);
1989 if (ret) {
1990 clk_disable_unprepare(spi_imx->clk_per);
1991 return ret;
1992 }
1993
1994 return 0;
1995}
1996
1997static int spi_imx_runtime_suspend(struct device *dev)
1998{
1999 struct spi_controller *controller = dev_get_drvdata(dev);
2000 struct spi_imx_data *spi_imx;
2001
2002 spi_imx = spi_controller_get_devdata(controller);
2003
2004 clk_disable_unprepare(spi_imx->clk_per);
2005 clk_disable_unprepare(spi_imx->clk_ipg);
2006
2007 return 0;
2008}
2009
2010static int spi_imx_suspend(struct device *dev)
2011{
2012 pinctrl_pm_select_sleep_state(dev);
2013 return 0;
2014}
2015
2016static int spi_imx_resume(struct device *dev)
2017{
2018 pinctrl_pm_select_default_state(dev);
2019 return 0;
2020}
2021
2022static const struct dev_pm_ops imx_spi_pm = {
2023 RUNTIME_PM_OPS(spi_imx_runtime_suspend, spi_imx_runtime_resume, NULL)
2024 SYSTEM_SLEEP_PM_OPS(spi_imx_suspend, spi_imx_resume)
2025};
2026
2027static struct platform_driver spi_imx_driver = {
2028 .driver = {
2029 .name = DRIVER_NAME,
2030 .of_match_table = spi_imx_dt_ids,
2031 .pm = pm_ptr(&imx_spi_pm),
2032 },
2033 .probe = spi_imx_probe,
2034 .remove = spi_imx_remove,
2035};
2036module_platform_driver(spi_imx_driver);
2037
2038MODULE_DESCRIPTION("i.MX SPI Controller driver");
2039MODULE_AUTHOR("Sascha Hauer, Pengutronix");
2040MODULE_LICENSE("GPL");
2041MODULE_ALIAS("platform:" DRIVER_NAME);