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Merge branch 'for-4.5/for-jens' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / drivers / spi / spi-imx.c
1 /*
2 * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
3 * Copyright (C) 2008 Juergen Beisert
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation
17 * 51 Franklin Street, Fifth Floor
18 * Boston, MA 02110-1301, USA.
19 */
20
21 #include <linux/clk.h>
22 #include <linux/completion.h>
23 #include <linux/delay.h>
24 #include <linux/dmaengine.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/err.h>
27 #include <linux/gpio.h>
28 #include <linux/interrupt.h>
29 #include <linux/io.h>
30 #include <linux/irq.h>
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/platform_device.h>
34 #include <linux/slab.h>
35 #include <linux/spi/spi.h>
36 #include <linux/spi/spi_bitbang.h>
37 #include <linux/types.h>
38 #include <linux/of.h>
39 #include <linux/of_device.h>
40 #include <linux/of_gpio.h>
41
42 #include <linux/platform_data/dma-imx.h>
43 #include <linux/platform_data/spi-imx.h>
44
45 #define DRIVER_NAME "spi_imx"
46
47 #define MXC_CSPIRXDATA 0x00
48 #define MXC_CSPITXDATA 0x04
49 #define MXC_CSPICTRL 0x08
50 #define MXC_CSPIINT 0x0c
51 #define MXC_RESET 0x1c
52
53 /* generic defines to abstract from the different register layouts */
54 #define MXC_INT_RR (1 << 0) /* Receive data ready interrupt */
55 #define MXC_INT_TE (1 << 1) /* Transmit FIFO empty interrupt */
56
57 /* The maximum bytes that a sdma BD can transfer.*/
58 #define MAX_SDMA_BD_BYTES (1 << 15)
59 #define IMX_DMA_TIMEOUT (msecs_to_jiffies(3000))
60 struct spi_imx_config {
61 unsigned int speed_hz;
62 unsigned int bpw;
63 unsigned int mode;
64 u8 cs;
65 };
66
67 enum spi_imx_devtype {
68 IMX1_CSPI,
69 IMX21_CSPI,
70 IMX27_CSPI,
71 IMX31_CSPI,
72 IMX35_CSPI, /* CSPI on all i.mx except above */
73 IMX51_ECSPI, /* ECSPI on i.mx51 and later */
74 };
75
76 struct spi_imx_data;
77
78 struct spi_imx_devtype_data {
79 void (*intctrl)(struct spi_imx_data *, int);
80 int (*config)(struct spi_imx_data *, struct spi_imx_config *);
81 void (*trigger)(struct spi_imx_data *);
82 int (*rx_available)(struct spi_imx_data *);
83 void (*reset)(struct spi_imx_data *);
84 enum spi_imx_devtype devtype;
85 };
86
87 struct spi_imx_data {
88 struct spi_bitbang bitbang;
89
90 struct completion xfer_done;
91 void __iomem *base;
92 struct clk *clk_per;
93 struct clk *clk_ipg;
94 unsigned long spi_clk;
95
96 unsigned int count;
97 void (*tx)(struct spi_imx_data *);
98 void (*rx)(struct spi_imx_data *);
99 void *rx_buf;
100 const void *tx_buf;
101 unsigned int txfifo; /* number of words pushed in tx FIFO */
102
103 /* DMA */
104 unsigned int dma_is_inited;
105 unsigned int dma_finished;
106 bool usedma;
107 u32 wml;
108 struct completion dma_rx_completion;
109 struct completion dma_tx_completion;
110
111 const struct spi_imx_devtype_data *devtype_data;
112 int chipselect[0];
113 };
114
115 static inline int is_imx27_cspi(struct spi_imx_data *d)
116 {
117 return d->devtype_data->devtype == IMX27_CSPI;
118 }
119
120 static inline int is_imx35_cspi(struct spi_imx_data *d)
121 {
122 return d->devtype_data->devtype == IMX35_CSPI;
123 }
124
125 static inline int is_imx51_ecspi(struct spi_imx_data *d)
126 {
127 return d->devtype_data->devtype == IMX51_ECSPI;
128 }
129
130 static inline unsigned spi_imx_get_fifosize(struct spi_imx_data *d)
131 {
132 return is_imx51_ecspi(d) ? 64 : 8;
133 }
134
135 #define MXC_SPI_BUF_RX(type) \
136 static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx) \
137 { \
138 unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); \
139 \
140 if (spi_imx->rx_buf) { \
141 *(type *)spi_imx->rx_buf = val; \
142 spi_imx->rx_buf += sizeof(type); \
143 } \
144 }
145
146 #define MXC_SPI_BUF_TX(type) \
147 static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx) \
148 { \
149 type val = 0; \
150 \
151 if (spi_imx->tx_buf) { \
152 val = *(type *)spi_imx->tx_buf; \
153 spi_imx->tx_buf += sizeof(type); \
154 } \
155 \
156 spi_imx->count -= sizeof(type); \
157 \
158 writel(val, spi_imx->base + MXC_CSPITXDATA); \
159 }
160
161 MXC_SPI_BUF_RX(u8)
162 MXC_SPI_BUF_TX(u8)
163 MXC_SPI_BUF_RX(u16)
164 MXC_SPI_BUF_TX(u16)
165 MXC_SPI_BUF_RX(u32)
166 MXC_SPI_BUF_TX(u32)
167
168 /* First entry is reserved, second entry is valid only if SDHC_SPIEN is set
169 * (which is currently not the case in this driver)
170 */
171 static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192,
172 256, 384, 512, 768, 1024};
173
174 /* MX21, MX27 */
175 static unsigned int spi_imx_clkdiv_1(unsigned int fin,
176 unsigned int fspi, unsigned int max)
177 {
178 int i;
179
180 for (i = 2; i < max; i++)
181 if (fspi * mxc_clkdivs[i] >= fin)
182 return i;
183
184 return max;
185 }
186
187 /* MX1, MX31, MX35, MX51 CSPI */
188 static unsigned int spi_imx_clkdiv_2(unsigned int fin,
189 unsigned int fspi)
190 {
191 int i, div = 4;
192
193 for (i = 0; i < 7; i++) {
194 if (fspi * div >= fin)
195 return i;
196 div <<= 1;
197 }
198
199 return 7;
200 }
201
202 static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
203 struct spi_transfer *transfer)
204 {
205 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
206
207 if (spi_imx->dma_is_inited &&
208 transfer->len > spi_imx->wml * sizeof(u32))
209 return true;
210 return false;
211 }
212
213 #define MX51_ECSPI_CTRL 0x08
214 #define MX51_ECSPI_CTRL_ENABLE (1 << 0)
215 #define MX51_ECSPI_CTRL_XCH (1 << 2)
216 #define MX51_ECSPI_CTRL_SMC (1 << 3)
217 #define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4)
218 #define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8
219 #define MX51_ECSPI_CTRL_PREDIV_OFFSET 12
220 #define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18)
221 #define MX51_ECSPI_CTRL_BL_OFFSET 20
222
223 #define MX51_ECSPI_CONFIG 0x0c
224 #define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0))
225 #define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs) + 4))
226 #define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs) + 8))
227 #define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs) + 12))
228 #define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs) + 20))
229
230 #define MX51_ECSPI_INT 0x10
231 #define MX51_ECSPI_INT_TEEN (1 << 0)
232 #define MX51_ECSPI_INT_RREN (1 << 3)
233
234 #define MX51_ECSPI_DMA 0x14
235 #define MX51_ECSPI_DMA_TX_WML_OFFSET 0
236 #define MX51_ECSPI_DMA_TX_WML_MASK 0x3F
237 #define MX51_ECSPI_DMA_RX_WML_OFFSET 16
238 #define MX51_ECSPI_DMA_RX_WML_MASK (0x3F << 16)
239 #define MX51_ECSPI_DMA_RXT_WML_OFFSET 24
240 #define MX51_ECSPI_DMA_RXT_WML_MASK (0x3F << 24)
241
242 #define MX51_ECSPI_DMA_TEDEN_OFFSET 7
243 #define MX51_ECSPI_DMA_RXDEN_OFFSET 23
244 #define MX51_ECSPI_DMA_RXTDEN_OFFSET 31
245
246 #define MX51_ECSPI_STAT 0x18
247 #define MX51_ECSPI_STAT_RR (1 << 3)
248
249 #define MX51_ECSPI_TESTREG 0x20
250 #define MX51_ECSPI_TESTREG_LBC BIT(31)
251
252 /* MX51 eCSPI */
253 static unsigned int mx51_ecspi_clkdiv(unsigned int fin, unsigned int fspi,
254 unsigned int *fres)
255 {
256 /*
257 * there are two 4-bit dividers, the pre-divider divides by
258 * $pre, the post-divider by 2^$post
259 */
260 unsigned int pre, post;
261
262 if (unlikely(fspi > fin))
263 return 0;
264
265 post = fls(fin) - fls(fspi);
266 if (fin > fspi << post)
267 post++;
268
269 /* now we have: (fin <= fspi << post) with post being minimal */
270
271 post = max(4U, post) - 4;
272 if (unlikely(post > 0xf)) {
273 pr_err("%s: cannot set clock freq: %u (base freq: %u)\n",
274 __func__, fspi, fin);
275 return 0xff;
276 }
277
278 pre = DIV_ROUND_UP(fin, fspi << post) - 1;
279
280 pr_debug("%s: fin: %u, fspi: %u, post: %u, pre: %u\n",
281 __func__, fin, fspi, post, pre);
282
283 /* Resulting frequency for the SCLK line. */
284 *fres = (fin / (pre + 1)) >> post;
285
286 return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) |
287 (post << MX51_ECSPI_CTRL_POSTDIV_OFFSET);
288 }
289
290 static void __maybe_unused mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
291 {
292 unsigned val = 0;
293
294 if (enable & MXC_INT_TE)
295 val |= MX51_ECSPI_INT_TEEN;
296
297 if (enable & MXC_INT_RR)
298 val |= MX51_ECSPI_INT_RREN;
299
300 writel(val, spi_imx->base + MX51_ECSPI_INT);
301 }
302
303 static void __maybe_unused mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
304 {
305 u32 reg = readl(spi_imx->base + MX51_ECSPI_CTRL);
306
307 if (!spi_imx->usedma)
308 reg |= MX51_ECSPI_CTRL_XCH;
309 else if (!spi_imx->dma_finished)
310 reg |= MX51_ECSPI_CTRL_SMC;
311 else
312 reg &= ~MX51_ECSPI_CTRL_SMC;
313 writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
314 }
315
316 static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
317 struct spi_imx_config *config)
318 {
319 u32 ctrl = MX51_ECSPI_CTRL_ENABLE, cfg = 0, dma = 0;
320 u32 tx_wml_cfg, rx_wml_cfg, rxt_wml_cfg;
321 u32 clk = config->speed_hz, delay, reg;
322
323 /*
324 * The hardware seems to have a race condition when changing modes. The
325 * current assumption is that the selection of the channel arrives
326 * earlier in the hardware than the mode bits when they are written at
327 * the same time.
328 * So set master mode for all channels as we do not support slave mode.
329 */
330 ctrl |= MX51_ECSPI_CTRL_MODE_MASK;
331
332 /* set clock speed */
333 ctrl |= mx51_ecspi_clkdiv(spi_imx->spi_clk, config->speed_hz, &clk);
334
335 /* set chip select to use */
336 ctrl |= MX51_ECSPI_CTRL_CS(config->cs);
337
338 ctrl |= (config->bpw - 1) << MX51_ECSPI_CTRL_BL_OFFSET;
339
340 cfg |= MX51_ECSPI_CONFIG_SBBCTRL(config->cs);
341
342 if (config->mode & SPI_CPHA)
343 cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
344 else
345 cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
346
347 if (config->mode & SPI_CPOL) {
348 cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs);
349 cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs);
350 } else {
351 cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(config->cs);
352 cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(config->cs);
353 }
354 if (config->mode & SPI_CS_HIGH)
355 cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs);
356 else
357 cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(config->cs);
358
359 /* CTRL register always go first to bring out controller from reset */
360 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
361
362 reg = readl(spi_imx->base + MX51_ECSPI_TESTREG);
363 if (config->mode & SPI_LOOP)
364 reg |= MX51_ECSPI_TESTREG_LBC;
365 else
366 reg &= ~MX51_ECSPI_TESTREG_LBC;
367 writel(reg, spi_imx->base + MX51_ECSPI_TESTREG);
368
369 writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
370
371 /*
372 * Wait until the changes in the configuration register CONFIGREG
373 * propagate into the hardware. It takes exactly one tick of the
374 * SCLK clock, but we will wait two SCLK clock just to be sure. The
375 * effect of the delay it takes for the hardware to apply changes
376 * is noticable if the SCLK clock run very slow. In such a case, if
377 * the polarity of SCLK should be inverted, the GPIO ChipSelect might
378 * be asserted before the SCLK polarity changes, which would disrupt
379 * the SPI communication as the device on the other end would consider
380 * the change of SCLK polarity as a clock tick already.
381 */
382 delay = (2 * 1000000) / clk;
383 if (likely(delay < 10)) /* SCLK is faster than 100 kHz */
384 udelay(delay);
385 else /* SCLK is _very_ slow */
386 usleep_range(delay, delay + 10);
387
388 /*
389 * Configure the DMA register: setup the watermark
390 * and enable DMA request.
391 */
392 if (spi_imx->dma_is_inited) {
393 dma = readl(spi_imx->base + MX51_ECSPI_DMA);
394
395 rx_wml_cfg = spi_imx->wml << MX51_ECSPI_DMA_RX_WML_OFFSET;
396 tx_wml_cfg = spi_imx->wml << MX51_ECSPI_DMA_TX_WML_OFFSET;
397 rxt_wml_cfg = spi_imx->wml << MX51_ECSPI_DMA_RXT_WML_OFFSET;
398 dma = (dma & ~MX51_ECSPI_DMA_TX_WML_MASK
399 & ~MX51_ECSPI_DMA_RX_WML_MASK
400 & ~MX51_ECSPI_DMA_RXT_WML_MASK)
401 | rx_wml_cfg | tx_wml_cfg | rxt_wml_cfg
402 |(1 << MX51_ECSPI_DMA_TEDEN_OFFSET)
403 |(1 << MX51_ECSPI_DMA_RXDEN_OFFSET)
404 |(1 << MX51_ECSPI_DMA_RXTDEN_OFFSET);
405
406 writel(dma, spi_imx->base + MX51_ECSPI_DMA);
407 }
408
409 return 0;
410 }
411
412 static int __maybe_unused mx51_ecspi_rx_available(struct spi_imx_data *spi_imx)
413 {
414 return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR;
415 }
416
417 static void __maybe_unused mx51_ecspi_reset(struct spi_imx_data *spi_imx)
418 {
419 /* drain receive buffer */
420 while (mx51_ecspi_rx_available(spi_imx))
421 readl(spi_imx->base + MXC_CSPIRXDATA);
422 }
423
424 #define MX31_INTREG_TEEN (1 << 0)
425 #define MX31_INTREG_RREN (1 << 3)
426
427 #define MX31_CSPICTRL_ENABLE (1 << 0)
428 #define MX31_CSPICTRL_MASTER (1 << 1)
429 #define MX31_CSPICTRL_XCH (1 << 2)
430 #define MX31_CSPICTRL_POL (1 << 4)
431 #define MX31_CSPICTRL_PHA (1 << 5)
432 #define MX31_CSPICTRL_SSCTL (1 << 6)
433 #define MX31_CSPICTRL_SSPOL (1 << 7)
434 #define MX31_CSPICTRL_BC_SHIFT 8
435 #define MX35_CSPICTRL_BL_SHIFT 20
436 #define MX31_CSPICTRL_CS_SHIFT 24
437 #define MX35_CSPICTRL_CS_SHIFT 12
438 #define MX31_CSPICTRL_DR_SHIFT 16
439
440 #define MX31_CSPISTATUS 0x14
441 #define MX31_STATUS_RR (1 << 3)
442
443 /* These functions also work for the i.MX35, but be aware that
444 * the i.MX35 has a slightly different register layout for bits
445 * we do not use here.
446 */
447 static void __maybe_unused mx31_intctrl(struct spi_imx_data *spi_imx, int enable)
448 {
449 unsigned int val = 0;
450
451 if (enable & MXC_INT_TE)
452 val |= MX31_INTREG_TEEN;
453 if (enable & MXC_INT_RR)
454 val |= MX31_INTREG_RREN;
455
456 writel(val, spi_imx->base + MXC_CSPIINT);
457 }
458
459 static void __maybe_unused mx31_trigger(struct spi_imx_data *spi_imx)
460 {
461 unsigned int reg;
462
463 reg = readl(spi_imx->base + MXC_CSPICTRL);
464 reg |= MX31_CSPICTRL_XCH;
465 writel(reg, spi_imx->base + MXC_CSPICTRL);
466 }
467
468 static int __maybe_unused mx31_config(struct spi_imx_data *spi_imx,
469 struct spi_imx_config *config)
470 {
471 unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
472 int cs = spi_imx->chipselect[config->cs];
473
474 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) <<
475 MX31_CSPICTRL_DR_SHIFT;
476
477 if (is_imx35_cspi(spi_imx)) {
478 reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT;
479 reg |= MX31_CSPICTRL_SSCTL;
480 } else {
481 reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT;
482 }
483
484 if (config->mode & SPI_CPHA)
485 reg |= MX31_CSPICTRL_PHA;
486 if (config->mode & SPI_CPOL)
487 reg |= MX31_CSPICTRL_POL;
488 if (config->mode & SPI_CS_HIGH)
489 reg |= MX31_CSPICTRL_SSPOL;
490 if (cs < 0)
491 reg |= (cs + 32) <<
492 (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT :
493 MX31_CSPICTRL_CS_SHIFT);
494
495 writel(reg, spi_imx->base + MXC_CSPICTRL);
496
497 return 0;
498 }
499
500 static int __maybe_unused mx31_rx_available(struct spi_imx_data *spi_imx)
501 {
502 return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR;
503 }
504
505 static void __maybe_unused mx31_reset(struct spi_imx_data *spi_imx)
506 {
507 /* drain receive buffer */
508 while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR)
509 readl(spi_imx->base + MXC_CSPIRXDATA);
510 }
511
512 #define MX21_INTREG_RR (1 << 4)
513 #define MX21_INTREG_TEEN (1 << 9)
514 #define MX21_INTREG_RREN (1 << 13)
515
516 #define MX21_CSPICTRL_POL (1 << 5)
517 #define MX21_CSPICTRL_PHA (1 << 6)
518 #define MX21_CSPICTRL_SSPOL (1 << 8)
519 #define MX21_CSPICTRL_XCH (1 << 9)
520 #define MX21_CSPICTRL_ENABLE (1 << 10)
521 #define MX21_CSPICTRL_MASTER (1 << 11)
522 #define MX21_CSPICTRL_DR_SHIFT 14
523 #define MX21_CSPICTRL_CS_SHIFT 19
524
525 static void __maybe_unused mx21_intctrl(struct spi_imx_data *spi_imx, int enable)
526 {
527 unsigned int val = 0;
528
529 if (enable & MXC_INT_TE)
530 val |= MX21_INTREG_TEEN;
531 if (enable & MXC_INT_RR)
532 val |= MX21_INTREG_RREN;
533
534 writel(val, spi_imx->base + MXC_CSPIINT);
535 }
536
537 static void __maybe_unused mx21_trigger(struct spi_imx_data *spi_imx)
538 {
539 unsigned int reg;
540
541 reg = readl(spi_imx->base + MXC_CSPICTRL);
542 reg |= MX21_CSPICTRL_XCH;
543 writel(reg, spi_imx->base + MXC_CSPICTRL);
544 }
545
546 static int __maybe_unused mx21_config(struct spi_imx_data *spi_imx,
547 struct spi_imx_config *config)
548 {
549 unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
550 int cs = spi_imx->chipselect[config->cs];
551 unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
552
553 reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max) <<
554 MX21_CSPICTRL_DR_SHIFT;
555 reg |= config->bpw - 1;
556
557 if (config->mode & SPI_CPHA)
558 reg |= MX21_CSPICTRL_PHA;
559 if (config->mode & SPI_CPOL)
560 reg |= MX21_CSPICTRL_POL;
561 if (config->mode & SPI_CS_HIGH)
562 reg |= MX21_CSPICTRL_SSPOL;
563 if (cs < 0)
564 reg |= (cs + 32) << MX21_CSPICTRL_CS_SHIFT;
565
566 writel(reg, spi_imx->base + MXC_CSPICTRL);
567
568 return 0;
569 }
570
571 static int __maybe_unused mx21_rx_available(struct spi_imx_data *spi_imx)
572 {
573 return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR;
574 }
575
576 static void __maybe_unused mx21_reset(struct spi_imx_data *spi_imx)
577 {
578 writel(1, spi_imx->base + MXC_RESET);
579 }
580
581 #define MX1_INTREG_RR (1 << 3)
582 #define MX1_INTREG_TEEN (1 << 8)
583 #define MX1_INTREG_RREN (1 << 11)
584
585 #define MX1_CSPICTRL_POL (1 << 4)
586 #define MX1_CSPICTRL_PHA (1 << 5)
587 #define MX1_CSPICTRL_XCH (1 << 8)
588 #define MX1_CSPICTRL_ENABLE (1 << 9)
589 #define MX1_CSPICTRL_MASTER (1 << 10)
590 #define MX1_CSPICTRL_DR_SHIFT 13
591
592 static void __maybe_unused mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
593 {
594 unsigned int val = 0;
595
596 if (enable & MXC_INT_TE)
597 val |= MX1_INTREG_TEEN;
598 if (enable & MXC_INT_RR)
599 val |= MX1_INTREG_RREN;
600
601 writel(val, spi_imx->base + MXC_CSPIINT);
602 }
603
604 static void __maybe_unused mx1_trigger(struct spi_imx_data *spi_imx)
605 {
606 unsigned int reg;
607
608 reg = readl(spi_imx->base + MXC_CSPICTRL);
609 reg |= MX1_CSPICTRL_XCH;
610 writel(reg, spi_imx->base + MXC_CSPICTRL);
611 }
612
613 static int __maybe_unused mx1_config(struct spi_imx_data *spi_imx,
614 struct spi_imx_config *config)
615 {
616 unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;
617
618 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) <<
619 MX1_CSPICTRL_DR_SHIFT;
620 reg |= config->bpw - 1;
621
622 if (config->mode & SPI_CPHA)
623 reg |= MX1_CSPICTRL_PHA;
624 if (config->mode & SPI_CPOL)
625 reg |= MX1_CSPICTRL_POL;
626
627 writel(reg, spi_imx->base + MXC_CSPICTRL);
628
629 return 0;
630 }
631
632 static int __maybe_unused mx1_rx_available(struct spi_imx_data *spi_imx)
633 {
634 return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR;
635 }
636
637 static void __maybe_unused mx1_reset(struct spi_imx_data *spi_imx)
638 {
639 writel(1, spi_imx->base + MXC_RESET);
640 }
641
642 static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
643 .intctrl = mx1_intctrl,
644 .config = mx1_config,
645 .trigger = mx1_trigger,
646 .rx_available = mx1_rx_available,
647 .reset = mx1_reset,
648 .devtype = IMX1_CSPI,
649 };
650
651 static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
652 .intctrl = mx21_intctrl,
653 .config = mx21_config,
654 .trigger = mx21_trigger,
655 .rx_available = mx21_rx_available,
656 .reset = mx21_reset,
657 .devtype = IMX21_CSPI,
658 };
659
660 static struct spi_imx_devtype_data imx27_cspi_devtype_data = {
661 /* i.mx27 cspi shares the functions with i.mx21 one */
662 .intctrl = mx21_intctrl,
663 .config = mx21_config,
664 .trigger = mx21_trigger,
665 .rx_available = mx21_rx_available,
666 .reset = mx21_reset,
667 .devtype = IMX27_CSPI,
668 };
669
670 static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
671 .intctrl = mx31_intctrl,
672 .config = mx31_config,
673 .trigger = mx31_trigger,
674 .rx_available = mx31_rx_available,
675 .reset = mx31_reset,
676 .devtype = IMX31_CSPI,
677 };
678
679 static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
680 /* i.mx35 and later cspi shares the functions with i.mx31 one */
681 .intctrl = mx31_intctrl,
682 .config = mx31_config,
683 .trigger = mx31_trigger,
684 .rx_available = mx31_rx_available,
685 .reset = mx31_reset,
686 .devtype = IMX35_CSPI,
687 };
688
689 static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
690 .intctrl = mx51_ecspi_intctrl,
691 .config = mx51_ecspi_config,
692 .trigger = mx51_ecspi_trigger,
693 .rx_available = mx51_ecspi_rx_available,
694 .reset = mx51_ecspi_reset,
695 .devtype = IMX51_ECSPI,
696 };
697
698 static const struct platform_device_id spi_imx_devtype[] = {
699 {
700 .name = "imx1-cspi",
701 .driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data,
702 }, {
703 .name = "imx21-cspi",
704 .driver_data = (kernel_ulong_t) &imx21_cspi_devtype_data,
705 }, {
706 .name = "imx27-cspi",
707 .driver_data = (kernel_ulong_t) &imx27_cspi_devtype_data,
708 }, {
709 .name = "imx31-cspi",
710 .driver_data = (kernel_ulong_t) &imx31_cspi_devtype_data,
711 }, {
712 .name = "imx35-cspi",
713 .driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data,
714 }, {
715 .name = "imx51-ecspi",
716 .driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data,
717 }, {
718 /* sentinel */
719 }
720 };
721
722 static const struct of_device_id spi_imx_dt_ids[] = {
723 { .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
724 { .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
725 { .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
726 { .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
727 { .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
728 { .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
729 { /* sentinel */ }
730 };
731 MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);
732
733 static void spi_imx_chipselect(struct spi_device *spi, int is_active)
734 {
735 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
736 int gpio = spi_imx->chipselect[spi->chip_select];
737 int active = is_active != BITBANG_CS_INACTIVE;
738 int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH);
739
740 if (!gpio_is_valid(gpio))
741 return;
742
743 gpio_set_value(gpio, dev_is_lowactive ^ active);
744 }
745
746 static void spi_imx_push(struct spi_imx_data *spi_imx)
747 {
748 while (spi_imx->txfifo < spi_imx_get_fifosize(spi_imx)) {
749 if (!spi_imx->count)
750 break;
751 spi_imx->tx(spi_imx);
752 spi_imx->txfifo++;
753 }
754
755 spi_imx->devtype_data->trigger(spi_imx);
756 }
757
758 static irqreturn_t spi_imx_isr(int irq, void *dev_id)
759 {
760 struct spi_imx_data *spi_imx = dev_id;
761
762 while (spi_imx->devtype_data->rx_available(spi_imx)) {
763 spi_imx->rx(spi_imx);
764 spi_imx->txfifo--;
765 }
766
767 if (spi_imx->count) {
768 spi_imx_push(spi_imx);
769 return IRQ_HANDLED;
770 }
771
772 if (spi_imx->txfifo) {
773 /* No data left to push, but still waiting for rx data,
774 * enable receive data available interrupt.
775 */
776 spi_imx->devtype_data->intctrl(
777 spi_imx, MXC_INT_RR);
778 return IRQ_HANDLED;
779 }
780
781 spi_imx->devtype_data->intctrl(spi_imx, 0);
782 complete(&spi_imx->xfer_done);
783
784 return IRQ_HANDLED;
785 }
786
787 static int spi_imx_setupxfer(struct spi_device *spi,
788 struct spi_transfer *t)
789 {
790 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
791 struct spi_imx_config config;
792
793 config.bpw = t ? t->bits_per_word : spi->bits_per_word;
794 config.speed_hz = t ? t->speed_hz : spi->max_speed_hz;
795 config.mode = spi->mode;
796 config.cs = spi->chip_select;
797
798 if (!config.speed_hz)
799 config.speed_hz = spi->max_speed_hz;
800 if (!config.bpw)
801 config.bpw = spi->bits_per_word;
802
803 /* Initialize the functions for transfer */
804 if (config.bpw <= 8) {
805 spi_imx->rx = spi_imx_buf_rx_u8;
806 spi_imx->tx = spi_imx_buf_tx_u8;
807 } else if (config.bpw <= 16) {
808 spi_imx->rx = spi_imx_buf_rx_u16;
809 spi_imx->tx = spi_imx_buf_tx_u16;
810 } else {
811 spi_imx->rx = spi_imx_buf_rx_u32;
812 spi_imx->tx = spi_imx_buf_tx_u32;
813 }
814
815 spi_imx->devtype_data->config(spi_imx, &config);
816
817 return 0;
818 }
819
820 static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
821 {
822 struct spi_master *master = spi_imx->bitbang.master;
823
824 if (master->dma_rx) {
825 dma_release_channel(master->dma_rx);
826 master->dma_rx = NULL;
827 }
828
829 if (master->dma_tx) {
830 dma_release_channel(master->dma_tx);
831 master->dma_tx = NULL;
832 }
833
834 spi_imx->dma_is_inited = 0;
835 }
836
837 static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
838 struct spi_master *master,
839 const struct resource *res)
840 {
841 struct dma_slave_config slave_config = {};
842 int ret;
843
844 /* use pio mode for i.mx6dl chip TKT238285 */
845 if (of_machine_is_compatible("fsl,imx6dl"))
846 return 0;
847
848 spi_imx->wml = spi_imx_get_fifosize(spi_imx) / 2;
849
850 /* Prepare for TX DMA: */
851 master->dma_tx = dma_request_slave_channel_reason(dev, "tx");
852 if (IS_ERR(master->dma_tx)) {
853 ret = PTR_ERR(master->dma_tx);
854 dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret);
855 master->dma_tx = NULL;
856 goto err;
857 }
858
859 slave_config.direction = DMA_MEM_TO_DEV;
860 slave_config.dst_addr = res->start + MXC_CSPITXDATA;
861 slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
862 slave_config.dst_maxburst = spi_imx->wml;
863 ret = dmaengine_slave_config(master->dma_tx, &slave_config);
864 if (ret) {
865 dev_err(dev, "error in TX dma configuration.\n");
866 goto err;
867 }
868
869 /* Prepare for RX : */
870 master->dma_rx = dma_request_slave_channel_reason(dev, "rx");
871 if (IS_ERR(master->dma_rx)) {
872 ret = PTR_ERR(master->dma_rx);
873 dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret);
874 master->dma_rx = NULL;
875 goto err;
876 }
877
878 slave_config.direction = DMA_DEV_TO_MEM;
879 slave_config.src_addr = res->start + MXC_CSPIRXDATA;
880 slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
881 slave_config.src_maxburst = spi_imx->wml;
882 ret = dmaengine_slave_config(master->dma_rx, &slave_config);
883 if (ret) {
884 dev_err(dev, "error in RX dma configuration.\n");
885 goto err;
886 }
887
888 init_completion(&spi_imx->dma_rx_completion);
889 init_completion(&spi_imx->dma_tx_completion);
890 master->can_dma = spi_imx_can_dma;
891 master->max_dma_len = MAX_SDMA_BD_BYTES;
892 spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX |
893 SPI_MASTER_MUST_TX;
894 spi_imx->dma_is_inited = 1;
895
896 return 0;
897 err:
898 spi_imx_sdma_exit(spi_imx);
899 return ret;
900 }
901
902 static void spi_imx_dma_rx_callback(void *cookie)
903 {
904 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
905
906 complete(&spi_imx->dma_rx_completion);
907 }
908
909 static void spi_imx_dma_tx_callback(void *cookie)
910 {
911 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
912
913 complete(&spi_imx->dma_tx_completion);
914 }
915
916 static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
917 struct spi_transfer *transfer)
918 {
919 struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL;
920 int ret;
921 unsigned long timeout;
922 u32 dma;
923 int left;
924 struct spi_master *master = spi_imx->bitbang.master;
925 struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
926
927 if (tx) {
928 desc_tx = dmaengine_prep_slave_sg(master->dma_tx,
929 tx->sgl, tx->nents, DMA_MEM_TO_DEV,
930 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
931 if (!desc_tx)
932 goto no_dma;
933
934 desc_tx->callback = spi_imx_dma_tx_callback;
935 desc_tx->callback_param = (void *)spi_imx;
936 dmaengine_submit(desc_tx);
937 }
938
939 if (rx) {
940 desc_rx = dmaengine_prep_slave_sg(master->dma_rx,
941 rx->sgl, rx->nents, DMA_DEV_TO_MEM,
942 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
943 if (!desc_rx)
944 goto no_dma;
945
946 desc_rx->callback = spi_imx_dma_rx_callback;
947 desc_rx->callback_param = (void *)spi_imx;
948 dmaengine_submit(desc_rx);
949 }
950
951 reinit_completion(&spi_imx->dma_rx_completion);
952 reinit_completion(&spi_imx->dma_tx_completion);
953
954 /* Trigger the cspi module. */
955 spi_imx->dma_finished = 0;
956
957 dma = readl(spi_imx->base + MX51_ECSPI_DMA);
958 dma = dma & (~MX51_ECSPI_DMA_RXT_WML_MASK);
959 /* Change RX_DMA_LENGTH trigger dma fetch tail data */
960 left = transfer->len % spi_imx->wml;
961 if (left)
962 writel(dma | (left << MX51_ECSPI_DMA_RXT_WML_OFFSET),
963 spi_imx->base + MX51_ECSPI_DMA);
964 /*
965 * Set these order to avoid potential RX overflow. The overflow may
966 * happen if we enable SPI HW before starting RX DMA due to rescheduling
967 * for another task and/or interrupt.
968 * So RX DMA enabled first to make sure data would be read out from FIFO
969 * ASAP. TX DMA enabled next to start filling TX FIFO with new data.
970 * And finaly SPI HW enabled to start actual data transfer.
971 */
972 dma_async_issue_pending(master->dma_rx);
973 dma_async_issue_pending(master->dma_tx);
974 spi_imx->devtype_data->trigger(spi_imx);
975
976 /* Wait SDMA to finish the data transfer.*/
977 timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
978 IMX_DMA_TIMEOUT);
979 if (!timeout) {
980 pr_warn("%s %s: I/O Error in DMA TX\n",
981 dev_driver_string(&master->dev),
982 dev_name(&master->dev));
983 dmaengine_terminate_all(master->dma_tx);
984 dmaengine_terminate_all(master->dma_rx);
985 } else {
986 timeout = wait_for_completion_timeout(
987 &spi_imx->dma_rx_completion, IMX_DMA_TIMEOUT);
988 if (!timeout) {
989 pr_warn("%s %s: I/O Error in DMA RX\n",
990 dev_driver_string(&master->dev),
991 dev_name(&master->dev));
992 spi_imx->devtype_data->reset(spi_imx);
993 dmaengine_terminate_all(master->dma_rx);
994 }
995 dma &= ~MX51_ECSPI_DMA_RXT_WML_MASK;
996 writel(dma |
997 spi_imx->wml << MX51_ECSPI_DMA_RXT_WML_OFFSET,
998 spi_imx->base + MX51_ECSPI_DMA);
999 }
1000
1001 spi_imx->dma_finished = 1;
1002 spi_imx->devtype_data->trigger(spi_imx);
1003
1004 if (!timeout)
1005 ret = -ETIMEDOUT;
1006 else
1007 ret = transfer->len;
1008
1009 return ret;
1010
1011 no_dma:
1012 pr_warn_once("%s %s: DMA not available, falling back to PIO\n",
1013 dev_driver_string(&master->dev),
1014 dev_name(&master->dev));
1015 return -EAGAIN;
1016 }
1017
1018 static int spi_imx_pio_transfer(struct spi_device *spi,
1019 struct spi_transfer *transfer)
1020 {
1021 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1022
1023 spi_imx->tx_buf = transfer->tx_buf;
1024 spi_imx->rx_buf = transfer->rx_buf;
1025 spi_imx->count = transfer->len;
1026 spi_imx->txfifo = 0;
1027
1028 reinit_completion(&spi_imx->xfer_done);
1029
1030 spi_imx_push(spi_imx);
1031
1032 spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE);
1033
1034 wait_for_completion(&spi_imx->xfer_done);
1035
1036 return transfer->len;
1037 }
1038
1039 static int spi_imx_transfer(struct spi_device *spi,
1040 struct spi_transfer *transfer)
1041 {
1042 int ret;
1043 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1044
1045 if (spi_imx->bitbang.master->can_dma &&
1046 spi_imx_can_dma(spi_imx->bitbang.master, spi, transfer)) {
1047 spi_imx->usedma = true;
1048 ret = spi_imx_dma_transfer(spi_imx, transfer);
1049 if (ret != -EAGAIN)
1050 return ret;
1051 }
1052 spi_imx->usedma = false;
1053
1054 return spi_imx_pio_transfer(spi, transfer);
1055 }
1056
1057 static int spi_imx_setup(struct spi_device *spi)
1058 {
1059 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1060 int gpio = spi_imx->chipselect[spi->chip_select];
1061
1062 dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__,
1063 spi->mode, spi->bits_per_word, spi->max_speed_hz);
1064
1065 if (gpio_is_valid(gpio))
1066 gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH ? 0 : 1);
1067
1068 spi_imx_chipselect(spi, BITBANG_CS_INACTIVE);
1069
1070 return 0;
1071 }
1072
1073 static void spi_imx_cleanup(struct spi_device *spi)
1074 {
1075 }
1076
1077 static int
1078 spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg)
1079 {
1080 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1081 int ret;
1082
1083 ret = clk_enable(spi_imx->clk_per);
1084 if (ret)
1085 return ret;
1086
1087 ret = clk_enable(spi_imx->clk_ipg);
1088 if (ret) {
1089 clk_disable(spi_imx->clk_per);
1090 return ret;
1091 }
1092
1093 return 0;
1094 }
1095
1096 static int
1097 spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg)
1098 {
1099 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1100
1101 clk_disable(spi_imx->clk_ipg);
1102 clk_disable(spi_imx->clk_per);
1103 return 0;
1104 }
1105
1106 static int spi_imx_probe(struct platform_device *pdev)
1107 {
1108 struct device_node *np = pdev->dev.of_node;
1109 const struct of_device_id *of_id =
1110 of_match_device(spi_imx_dt_ids, &pdev->dev);
1111 struct spi_imx_master *mxc_platform_info =
1112 dev_get_platdata(&pdev->dev);
1113 struct spi_master *master;
1114 struct spi_imx_data *spi_imx;
1115 struct resource *res;
1116 int i, ret, num_cs, irq;
1117
1118 if (!np && !mxc_platform_info) {
1119 dev_err(&pdev->dev, "can't get the platform data\n");
1120 return -EINVAL;
1121 }
1122
1123 ret = of_property_read_u32(np, "fsl,spi-num-chipselects", &num_cs);
1124 if (ret < 0) {
1125 if (mxc_platform_info)
1126 num_cs = mxc_platform_info->num_chipselect;
1127 else
1128 return ret;
1129 }
1130
1131 master = spi_alloc_master(&pdev->dev,
1132 sizeof(struct spi_imx_data) + sizeof(int) * num_cs);
1133 if (!master)
1134 return -ENOMEM;
1135
1136 platform_set_drvdata(pdev, master);
1137
1138 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
1139 master->bus_num = pdev->id;
1140 master->num_chipselect = num_cs;
1141
1142 spi_imx = spi_master_get_devdata(master);
1143 spi_imx->bitbang.master = master;
1144
1145 spi_imx->devtype_data = of_id ? of_id->data :
1146 (struct spi_imx_devtype_data *)pdev->id_entry->driver_data;
1147
1148 for (i = 0; i < master->num_chipselect; i++) {
1149 int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
1150 if (!gpio_is_valid(cs_gpio) && mxc_platform_info)
1151 cs_gpio = mxc_platform_info->chipselect[i];
1152
1153 spi_imx->chipselect[i] = cs_gpio;
1154 if (!gpio_is_valid(cs_gpio))
1155 continue;
1156
1157 ret = devm_gpio_request(&pdev->dev, spi_imx->chipselect[i],
1158 DRIVER_NAME);
1159 if (ret) {
1160 dev_err(&pdev->dev, "can't get cs gpios\n");
1161 goto out_master_put;
1162 }
1163 }
1164
1165 spi_imx->bitbang.chipselect = spi_imx_chipselect;
1166 spi_imx->bitbang.setup_transfer = spi_imx_setupxfer;
1167 spi_imx->bitbang.txrx_bufs = spi_imx_transfer;
1168 spi_imx->bitbang.master->setup = spi_imx_setup;
1169 spi_imx->bitbang.master->cleanup = spi_imx_cleanup;
1170 spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message;
1171 spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message;
1172 spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1173 if (is_imx51_ecspi(spi_imx))
1174 spi_imx->bitbang.master->mode_bits |= SPI_LOOP;
1175
1176 init_completion(&spi_imx->xfer_done);
1177
1178 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1179 spi_imx->base = devm_ioremap_resource(&pdev->dev, res);
1180 if (IS_ERR(spi_imx->base)) {
1181 ret = PTR_ERR(spi_imx->base);
1182 goto out_master_put;
1183 }
1184
1185 irq = platform_get_irq(pdev, 0);
1186 if (irq < 0) {
1187 ret = irq;
1188 goto out_master_put;
1189 }
1190
1191 ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0,
1192 dev_name(&pdev->dev), spi_imx);
1193 if (ret) {
1194 dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
1195 goto out_master_put;
1196 }
1197
1198 spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1199 if (IS_ERR(spi_imx->clk_ipg)) {
1200 ret = PTR_ERR(spi_imx->clk_ipg);
1201 goto out_master_put;
1202 }
1203
1204 spi_imx->clk_per = devm_clk_get(&pdev->dev, "per");
1205 if (IS_ERR(spi_imx->clk_per)) {
1206 ret = PTR_ERR(spi_imx->clk_per);
1207 goto out_master_put;
1208 }
1209
1210 ret = clk_prepare_enable(spi_imx->clk_per);
1211 if (ret)
1212 goto out_master_put;
1213
1214 ret = clk_prepare_enable(spi_imx->clk_ipg);
1215 if (ret)
1216 goto out_put_per;
1217
1218 spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
1219 /*
1220 * Only validated on i.mx6 now, can remove the constrain if validated on
1221 * other chips.
1222 */
1223 if (is_imx51_ecspi(spi_imx)) {
1224 ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master, res);
1225 if (ret == -EPROBE_DEFER)
1226 goto out_clk_put;
1227
1228 if (ret < 0)
1229 dev_err(&pdev->dev, "dma setup error %d, use pio\n",
1230 ret);
1231 }
1232
1233 spi_imx->devtype_data->reset(spi_imx);
1234
1235 spi_imx->devtype_data->intctrl(spi_imx, 0);
1236
1237 master->dev.of_node = pdev->dev.of_node;
1238 ret = spi_bitbang_start(&spi_imx->bitbang);
1239 if (ret) {
1240 dev_err(&pdev->dev, "bitbang start failed with %d\n", ret);
1241 goto out_clk_put;
1242 }
1243
1244 dev_info(&pdev->dev, "probed\n");
1245
1246 clk_disable(spi_imx->clk_ipg);
1247 clk_disable(spi_imx->clk_per);
1248 return ret;
1249
1250 out_clk_put:
1251 clk_disable_unprepare(spi_imx->clk_ipg);
1252 out_put_per:
1253 clk_disable_unprepare(spi_imx->clk_per);
1254 out_master_put:
1255 spi_master_put(master);
1256
1257 return ret;
1258 }
1259
1260 static int spi_imx_remove(struct platform_device *pdev)
1261 {
1262 struct spi_master *master = platform_get_drvdata(pdev);
1263 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1264
1265 spi_bitbang_stop(&spi_imx->bitbang);
1266
1267 writel(0, spi_imx->base + MXC_CSPICTRL);
1268 clk_unprepare(spi_imx->clk_ipg);
1269 clk_unprepare(spi_imx->clk_per);
1270 spi_imx_sdma_exit(spi_imx);
1271 spi_master_put(master);
1272
1273 return 0;
1274 }
1275
1276 static struct platform_driver spi_imx_driver = {
1277 .driver = {
1278 .name = DRIVER_NAME,
1279 .of_match_table = spi_imx_dt_ids,
1280 },
1281 .id_table = spi_imx_devtype,
1282 .probe = spi_imx_probe,
1283 .remove = spi_imx_remove,
1284 };
1285 module_platform_driver(spi_imx_driver);
1286
1287 MODULE_DESCRIPTION("SPI Master Controller driver");
1288 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1289 MODULE_LICENSE("GPL");
1290 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux kernel - Deliverables
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