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1 | /* | |
2 | * OMAP2 McSPI controller driver | |
3 | * | |
4 | * Copyright (C) 2005, 2006 Nokia Corporation | |
5 | * Author: Samuel Ortiz <samuel.ortiz@nokia.com> and | |
6 | * Juha Yrj�l� <juha.yrjola@nokia.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/device.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/dma-mapping.h> | |
25 | #include <linux/dmaengine.h> | |
26 | #include <linux/pinctrl/consumer.h> | |
27 | #include <linux/platform_device.h> | |
28 | #include <linux/err.h> | |
29 | #include <linux/clk.h> | |
30 | #include <linux/io.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/pm_runtime.h> | |
33 | #include <linux/of.h> | |
34 | #include <linux/of_device.h> | |
35 | #include <linux/gcd.h> | |
36 | ||
37 | #include <linux/spi/spi.h> | |
38 | #include <linux/gpio.h> | |
39 | ||
40 | #include <linux/platform_data/spi-omap2-mcspi.h> | |
41 | ||
42 | #define OMAP2_MCSPI_MAX_FREQ 48000000 | |
43 | #define OMAP2_MCSPI_MAX_DIVIDER 4096 | |
44 | #define OMAP2_MCSPI_MAX_FIFODEPTH 64 | |
45 | #define OMAP2_MCSPI_MAX_FIFOWCNT 0xFFFF | |
46 | #define SPI_AUTOSUSPEND_TIMEOUT 2000 | |
47 | ||
48 | #define OMAP2_MCSPI_REVISION 0x00 | |
49 | #define OMAP2_MCSPI_SYSSTATUS 0x14 | |
50 | #define OMAP2_MCSPI_IRQSTATUS 0x18 | |
51 | #define OMAP2_MCSPI_IRQENABLE 0x1c | |
52 | #define OMAP2_MCSPI_WAKEUPENABLE 0x20 | |
53 | #define OMAP2_MCSPI_SYST 0x24 | |
54 | #define OMAP2_MCSPI_MODULCTRL 0x28 | |
55 | #define OMAP2_MCSPI_XFERLEVEL 0x7c | |
56 | ||
57 | /* per-channel banks, 0x14 bytes each, first is: */ | |
58 | #define OMAP2_MCSPI_CHCONF0 0x2c | |
59 | #define OMAP2_MCSPI_CHSTAT0 0x30 | |
60 | #define OMAP2_MCSPI_CHCTRL0 0x34 | |
61 | #define OMAP2_MCSPI_TX0 0x38 | |
62 | #define OMAP2_MCSPI_RX0 0x3c | |
63 | ||
64 | /* per-register bitmasks: */ | |
65 | #define OMAP2_MCSPI_IRQSTATUS_EOW BIT(17) | |
66 | ||
67 | #define OMAP2_MCSPI_MODULCTRL_SINGLE BIT(0) | |
68 | #define OMAP2_MCSPI_MODULCTRL_MS BIT(2) | |
69 | #define OMAP2_MCSPI_MODULCTRL_STEST BIT(3) | |
70 | ||
71 | #define OMAP2_MCSPI_CHCONF_PHA BIT(0) | |
72 | #define OMAP2_MCSPI_CHCONF_POL BIT(1) | |
73 | #define OMAP2_MCSPI_CHCONF_CLKD_MASK (0x0f << 2) | |
74 | #define OMAP2_MCSPI_CHCONF_EPOL BIT(6) | |
75 | #define OMAP2_MCSPI_CHCONF_WL_MASK (0x1f << 7) | |
76 | #define OMAP2_MCSPI_CHCONF_TRM_RX_ONLY BIT(12) | |
77 | #define OMAP2_MCSPI_CHCONF_TRM_TX_ONLY BIT(13) | |
78 | #define OMAP2_MCSPI_CHCONF_TRM_MASK (0x03 << 12) | |
79 | #define OMAP2_MCSPI_CHCONF_DMAW BIT(14) | |
80 | #define OMAP2_MCSPI_CHCONF_DMAR BIT(15) | |
81 | #define OMAP2_MCSPI_CHCONF_DPE0 BIT(16) | |
82 | #define OMAP2_MCSPI_CHCONF_DPE1 BIT(17) | |
83 | #define OMAP2_MCSPI_CHCONF_IS BIT(18) | |
84 | #define OMAP2_MCSPI_CHCONF_TURBO BIT(19) | |
85 | #define OMAP2_MCSPI_CHCONF_FORCE BIT(20) | |
86 | #define OMAP2_MCSPI_CHCONF_FFET BIT(27) | |
87 | #define OMAP2_MCSPI_CHCONF_FFER BIT(28) | |
88 | #define OMAP2_MCSPI_CHCONF_CLKG BIT(29) | |
89 | ||
90 | #define OMAP2_MCSPI_CHSTAT_RXS BIT(0) | |
91 | #define OMAP2_MCSPI_CHSTAT_TXS BIT(1) | |
92 | #define OMAP2_MCSPI_CHSTAT_EOT BIT(2) | |
93 | #define OMAP2_MCSPI_CHSTAT_TXFFE BIT(3) | |
94 | ||
95 | #define OMAP2_MCSPI_CHCTRL_EN BIT(0) | |
96 | #define OMAP2_MCSPI_CHCTRL_EXTCLK_MASK (0xff << 8) | |
97 | ||
98 | #define OMAP2_MCSPI_WAKEUPENABLE_WKEN BIT(0) | |
99 | ||
100 | /* We have 2 DMA channels per CS, one for RX and one for TX */ | |
101 | struct omap2_mcspi_dma { | |
102 | struct dma_chan *dma_tx; | |
103 | struct dma_chan *dma_rx; | |
104 | ||
105 | struct completion dma_tx_completion; | |
106 | struct completion dma_rx_completion; | |
107 | ||
108 | char dma_rx_ch_name[14]; | |
109 | char dma_tx_ch_name[14]; | |
110 | }; | |
111 | ||
112 | /* use PIO for small transfers, avoiding DMA setup/teardown overhead and | |
113 | * cache operations; better heuristics consider wordsize and bitrate. | |
114 | */ | |
115 | #define DMA_MIN_BYTES 160 | |
116 | ||
117 | ||
118 | /* | |
119 | * Used for context save and restore, structure members to be updated whenever | |
120 | * corresponding registers are modified. | |
121 | */ | |
122 | struct omap2_mcspi_regs { | |
123 | u32 modulctrl; | |
124 | u32 wakeupenable; | |
125 | struct list_head cs; | |
126 | }; | |
127 | ||
128 | struct omap2_mcspi { | |
129 | struct spi_master *master; | |
130 | /* Virtual base address of the controller */ | |
131 | void __iomem *base; | |
132 | unsigned long phys; | |
133 | /* SPI1 has 4 channels, while SPI2 has 2 */ | |
134 | struct omap2_mcspi_dma *dma_channels; | |
135 | struct device *dev; | |
136 | struct omap2_mcspi_regs ctx; | |
137 | int fifo_depth; | |
138 | unsigned int pin_dir:1; | |
139 | }; | |
140 | ||
141 | struct omap2_mcspi_cs { | |
142 | void __iomem *base; | |
143 | unsigned long phys; | |
144 | int word_len; | |
145 | u16 mode; | |
146 | struct list_head node; | |
147 | /* Context save and restore shadow register */ | |
148 | u32 chconf0, chctrl0; | |
149 | }; | |
150 | ||
151 | static inline void mcspi_write_reg(struct spi_master *master, | |
152 | int idx, u32 val) | |
153 | { | |
154 | struct omap2_mcspi *mcspi = spi_master_get_devdata(master); | |
155 | ||
156 | writel_relaxed(val, mcspi->base + idx); | |
157 | } | |
158 | ||
159 | static inline u32 mcspi_read_reg(struct spi_master *master, int idx) | |
160 | { | |
161 | struct omap2_mcspi *mcspi = spi_master_get_devdata(master); | |
162 | ||
163 | return readl_relaxed(mcspi->base + idx); | |
164 | } | |
165 | ||
166 | static inline void mcspi_write_cs_reg(const struct spi_device *spi, | |
167 | int idx, u32 val) | |
168 | { | |
169 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
170 | ||
171 | writel_relaxed(val, cs->base + idx); | |
172 | } | |
173 | ||
174 | static inline u32 mcspi_read_cs_reg(const struct spi_device *spi, int idx) | |
175 | { | |
176 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
177 | ||
178 | return readl_relaxed(cs->base + idx); | |
179 | } | |
180 | ||
181 | static inline u32 mcspi_cached_chconf0(const struct spi_device *spi) | |
182 | { | |
183 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
184 | ||
185 | return cs->chconf0; | |
186 | } | |
187 | ||
188 | static inline void mcspi_write_chconf0(const struct spi_device *spi, u32 val) | |
189 | { | |
190 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
191 | ||
192 | cs->chconf0 = val; | |
193 | mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, val); | |
194 | mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0); | |
195 | } | |
196 | ||
197 | static inline int mcspi_bytes_per_word(int word_len) | |
198 | { | |
199 | if (word_len <= 8) | |
200 | return 1; | |
201 | else if (word_len <= 16) | |
202 | return 2; | |
203 | else /* word_len <= 32 */ | |
204 | return 4; | |
205 | } | |
206 | ||
207 | static void omap2_mcspi_set_dma_req(const struct spi_device *spi, | |
208 | int is_read, int enable) | |
209 | { | |
210 | u32 l, rw; | |
211 | ||
212 | l = mcspi_cached_chconf0(spi); | |
213 | ||
214 | if (is_read) /* 1 is read, 0 write */ | |
215 | rw = OMAP2_MCSPI_CHCONF_DMAR; | |
216 | else | |
217 | rw = OMAP2_MCSPI_CHCONF_DMAW; | |
218 | ||
219 | if (enable) | |
220 | l |= rw; | |
221 | else | |
222 | l &= ~rw; | |
223 | ||
224 | mcspi_write_chconf0(spi, l); | |
225 | } | |
226 | ||
227 | static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable) | |
228 | { | |
229 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
230 | u32 l; | |
231 | ||
232 | l = cs->chctrl0; | |
233 | if (enable) | |
234 | l |= OMAP2_MCSPI_CHCTRL_EN; | |
235 | else | |
236 | l &= ~OMAP2_MCSPI_CHCTRL_EN; | |
237 | cs->chctrl0 = l; | |
238 | mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, cs->chctrl0); | |
239 | /* Flash post-writes */ | |
240 | mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0); | |
241 | } | |
242 | ||
243 | static void omap2_mcspi_set_cs(struct spi_device *spi, bool enable) | |
244 | { | |
245 | struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); | |
246 | u32 l; | |
247 | ||
248 | /* The controller handles the inverted chip selects | |
249 | * using the OMAP2_MCSPI_CHCONF_EPOL bit so revert | |
250 | * the inversion from the core spi_set_cs function. | |
251 | */ | |
252 | if (spi->mode & SPI_CS_HIGH) | |
253 | enable = !enable; | |
254 | ||
255 | if (spi->controller_state) { | |
256 | int err = pm_runtime_get_sync(mcspi->dev); | |
257 | if (err < 0) { | |
258 | dev_err(mcspi->dev, "failed to get sync: %d\n", err); | |
259 | return; | |
260 | } | |
261 | ||
262 | l = mcspi_cached_chconf0(spi); | |
263 | ||
264 | if (enable) | |
265 | l &= ~OMAP2_MCSPI_CHCONF_FORCE; | |
266 | else | |
267 | l |= OMAP2_MCSPI_CHCONF_FORCE; | |
268 | ||
269 | mcspi_write_chconf0(spi, l); | |
270 | ||
271 | pm_runtime_mark_last_busy(mcspi->dev); | |
272 | pm_runtime_put_autosuspend(mcspi->dev); | |
273 | } | |
274 | } | |
275 | ||
276 | static void omap2_mcspi_set_master_mode(struct spi_master *master) | |
277 | { | |
278 | struct omap2_mcspi *mcspi = spi_master_get_devdata(master); | |
279 | struct omap2_mcspi_regs *ctx = &mcspi->ctx; | |
280 | u32 l; | |
281 | ||
282 | /* | |
283 | * Setup when switching from (reset default) slave mode | |
284 | * to single-channel master mode | |
285 | */ | |
286 | l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL); | |
287 | l &= ~(OMAP2_MCSPI_MODULCTRL_STEST | OMAP2_MCSPI_MODULCTRL_MS); | |
288 | l |= OMAP2_MCSPI_MODULCTRL_SINGLE; | |
289 | mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l); | |
290 | ||
291 | ctx->modulctrl = l; | |
292 | } | |
293 | ||
294 | static void omap2_mcspi_set_fifo(const struct spi_device *spi, | |
295 | struct spi_transfer *t, int enable) | |
296 | { | |
297 | struct spi_master *master = spi->master; | |
298 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
299 | struct omap2_mcspi *mcspi; | |
300 | unsigned int wcnt; | |
301 | int max_fifo_depth, fifo_depth, bytes_per_word; | |
302 | u32 chconf, xferlevel; | |
303 | ||
304 | mcspi = spi_master_get_devdata(master); | |
305 | ||
306 | chconf = mcspi_cached_chconf0(spi); | |
307 | if (enable) { | |
308 | bytes_per_word = mcspi_bytes_per_word(cs->word_len); | |
309 | if (t->len % bytes_per_word != 0) | |
310 | goto disable_fifo; | |
311 | ||
312 | if (t->rx_buf != NULL && t->tx_buf != NULL) | |
313 | max_fifo_depth = OMAP2_MCSPI_MAX_FIFODEPTH / 2; | |
314 | else | |
315 | max_fifo_depth = OMAP2_MCSPI_MAX_FIFODEPTH; | |
316 | ||
317 | fifo_depth = gcd(t->len, max_fifo_depth); | |
318 | if (fifo_depth < 2 || fifo_depth % bytes_per_word != 0) | |
319 | goto disable_fifo; | |
320 | ||
321 | wcnt = t->len / bytes_per_word; | |
322 | if (wcnt > OMAP2_MCSPI_MAX_FIFOWCNT) | |
323 | goto disable_fifo; | |
324 | ||
325 | xferlevel = wcnt << 16; | |
326 | if (t->rx_buf != NULL) { | |
327 | chconf |= OMAP2_MCSPI_CHCONF_FFER; | |
328 | xferlevel |= (fifo_depth - 1) << 8; | |
329 | } | |
330 | if (t->tx_buf != NULL) { | |
331 | chconf |= OMAP2_MCSPI_CHCONF_FFET; | |
332 | xferlevel |= fifo_depth - 1; | |
333 | } | |
334 | ||
335 | mcspi_write_reg(master, OMAP2_MCSPI_XFERLEVEL, xferlevel); | |
336 | mcspi_write_chconf0(spi, chconf); | |
337 | mcspi->fifo_depth = fifo_depth; | |
338 | ||
339 | return; | |
340 | } | |
341 | ||
342 | disable_fifo: | |
343 | if (t->rx_buf != NULL) | |
344 | chconf &= ~OMAP2_MCSPI_CHCONF_FFER; | |
345 | ||
346 | if (t->tx_buf != NULL) | |
347 | chconf &= ~OMAP2_MCSPI_CHCONF_FFET; | |
348 | ||
349 | mcspi_write_chconf0(spi, chconf); | |
350 | mcspi->fifo_depth = 0; | |
351 | } | |
352 | ||
353 | static void omap2_mcspi_restore_ctx(struct omap2_mcspi *mcspi) | |
354 | { | |
355 | struct spi_master *spi_cntrl = mcspi->master; | |
356 | struct omap2_mcspi_regs *ctx = &mcspi->ctx; | |
357 | struct omap2_mcspi_cs *cs; | |
358 | ||
359 | /* McSPI: context restore */ | |
360 | mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_MODULCTRL, ctx->modulctrl); | |
361 | mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_WAKEUPENABLE, ctx->wakeupenable); | |
362 | ||
363 | list_for_each_entry(cs, &ctx->cs, node) | |
364 | writel_relaxed(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); | |
365 | } | |
366 | ||
367 | static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit) | |
368 | { | |
369 | unsigned long timeout; | |
370 | ||
371 | timeout = jiffies + msecs_to_jiffies(1000); | |
372 | while (!(readl_relaxed(reg) & bit)) { | |
373 | if (time_after(jiffies, timeout)) { | |
374 | if (!(readl_relaxed(reg) & bit)) | |
375 | return -ETIMEDOUT; | |
376 | else | |
377 | return 0; | |
378 | } | |
379 | cpu_relax(); | |
380 | } | |
381 | return 0; | |
382 | } | |
383 | ||
384 | static void omap2_mcspi_rx_callback(void *data) | |
385 | { | |
386 | struct spi_device *spi = data; | |
387 | struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); | |
388 | struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
389 | ||
390 | /* We must disable the DMA RX request */ | |
391 | omap2_mcspi_set_dma_req(spi, 1, 0); | |
392 | ||
393 | complete(&mcspi_dma->dma_rx_completion); | |
394 | } | |
395 | ||
396 | static void omap2_mcspi_tx_callback(void *data) | |
397 | { | |
398 | struct spi_device *spi = data; | |
399 | struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); | |
400 | struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
401 | ||
402 | /* We must disable the DMA TX request */ | |
403 | omap2_mcspi_set_dma_req(spi, 0, 0); | |
404 | ||
405 | complete(&mcspi_dma->dma_tx_completion); | |
406 | } | |
407 | ||
408 | static void omap2_mcspi_tx_dma(struct spi_device *spi, | |
409 | struct spi_transfer *xfer, | |
410 | struct dma_slave_config cfg) | |
411 | { | |
412 | struct omap2_mcspi *mcspi; | |
413 | struct omap2_mcspi_dma *mcspi_dma; | |
414 | unsigned int count; | |
415 | ||
416 | mcspi = spi_master_get_devdata(spi->master); | |
417 | mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
418 | count = xfer->len; | |
419 | ||
420 | if (mcspi_dma->dma_tx) { | |
421 | struct dma_async_tx_descriptor *tx; | |
422 | ||
423 | dmaengine_slave_config(mcspi_dma->dma_tx, &cfg); | |
424 | ||
425 | tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, xfer->tx_sg.sgl, | |
426 | xfer->tx_sg.nents, | |
427 | DMA_MEM_TO_DEV, | |
428 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
429 | if (tx) { | |
430 | tx->callback = omap2_mcspi_tx_callback; | |
431 | tx->callback_param = spi; | |
432 | dmaengine_submit(tx); | |
433 | } else { | |
434 | /* FIXME: fall back to PIO? */ | |
435 | } | |
436 | } | |
437 | dma_async_issue_pending(mcspi_dma->dma_tx); | |
438 | omap2_mcspi_set_dma_req(spi, 0, 1); | |
439 | ||
440 | } | |
441 | ||
442 | static unsigned | |
443 | omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer, | |
444 | struct dma_slave_config cfg, | |
445 | unsigned es) | |
446 | { | |
447 | struct omap2_mcspi *mcspi; | |
448 | struct omap2_mcspi_dma *mcspi_dma; | |
449 | unsigned int count, transfer_reduction = 0; | |
450 | struct scatterlist *sg_out[2]; | |
451 | int nb_sizes = 0, out_mapped_nents[2], ret, x; | |
452 | size_t sizes[2]; | |
453 | u32 l; | |
454 | int elements = 0; | |
455 | int word_len, element_count; | |
456 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
457 | void __iomem *chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0; | |
458 | ||
459 | mcspi = spi_master_get_devdata(spi->master); | |
460 | mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
461 | count = xfer->len; | |
462 | ||
463 | /* | |
464 | * In the "End-of-Transfer Procedure" section for DMA RX in OMAP35x TRM | |
465 | * it mentions reducing DMA transfer length by one element in master | |
466 | * normal mode. | |
467 | */ | |
468 | if (mcspi->fifo_depth == 0) | |
469 | transfer_reduction = es; | |
470 | ||
471 | word_len = cs->word_len; | |
472 | l = mcspi_cached_chconf0(spi); | |
473 | ||
474 | if (word_len <= 8) | |
475 | element_count = count; | |
476 | else if (word_len <= 16) | |
477 | element_count = count >> 1; | |
478 | else /* word_len <= 32 */ | |
479 | element_count = count >> 2; | |
480 | ||
481 | if (mcspi_dma->dma_rx) { | |
482 | struct dma_async_tx_descriptor *tx; | |
483 | ||
484 | dmaengine_slave_config(mcspi_dma->dma_rx, &cfg); | |
485 | ||
486 | /* | |
487 | * Reduce DMA transfer length by one more if McSPI is | |
488 | * configured in turbo mode. | |
489 | */ | |
490 | if ((l & OMAP2_MCSPI_CHCONF_TURBO) && mcspi->fifo_depth == 0) | |
491 | transfer_reduction += es; | |
492 | ||
493 | if (transfer_reduction) { | |
494 | /* Split sgl into two. The second sgl won't be used. */ | |
495 | sizes[0] = count - transfer_reduction; | |
496 | sizes[1] = transfer_reduction; | |
497 | nb_sizes = 2; | |
498 | } else { | |
499 | /* | |
500 | * Don't bother splitting the sgl. This essentially | |
501 | * clones the original sgl. | |
502 | */ | |
503 | sizes[0] = count; | |
504 | nb_sizes = 1; | |
505 | } | |
506 | ||
507 | ret = sg_split(xfer->rx_sg.sgl, xfer->rx_sg.nents, | |
508 | 0, nb_sizes, | |
509 | sizes, | |
510 | sg_out, out_mapped_nents, | |
511 | GFP_KERNEL); | |
512 | ||
513 | if (ret < 0) { | |
514 | dev_err(&spi->dev, "sg_split failed\n"); | |
515 | return 0; | |
516 | } | |
517 | ||
518 | tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, | |
519 | sg_out[0], | |
520 | out_mapped_nents[0], | |
521 | DMA_DEV_TO_MEM, | |
522 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
523 | if (tx) { | |
524 | tx->callback = omap2_mcspi_rx_callback; | |
525 | tx->callback_param = spi; | |
526 | dmaengine_submit(tx); | |
527 | } else { | |
528 | /* FIXME: fall back to PIO? */ | |
529 | } | |
530 | } | |
531 | ||
532 | dma_async_issue_pending(mcspi_dma->dma_rx); | |
533 | omap2_mcspi_set_dma_req(spi, 1, 1); | |
534 | ||
535 | wait_for_completion(&mcspi_dma->dma_rx_completion); | |
536 | ||
537 | for (x = 0; x < nb_sizes; x++) | |
538 | kfree(sg_out[x]); | |
539 | ||
540 | if (mcspi->fifo_depth > 0) | |
541 | return count; | |
542 | ||
543 | /* | |
544 | * Due to the DMA transfer length reduction the missing bytes must | |
545 | * be read manually to receive all of the expected data. | |
546 | */ | |
547 | omap2_mcspi_set_enable(spi, 0); | |
548 | ||
549 | elements = element_count - 1; | |
550 | ||
551 | if (l & OMAP2_MCSPI_CHCONF_TURBO) { | |
552 | elements--; | |
553 | ||
554 | if (!mcspi_wait_for_reg_bit(chstat_reg, | |
555 | OMAP2_MCSPI_CHSTAT_RXS)) { | |
556 | u32 w; | |
557 | ||
558 | w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0); | |
559 | if (word_len <= 8) | |
560 | ((u8 *)xfer->rx_buf)[elements++] = w; | |
561 | else if (word_len <= 16) | |
562 | ((u16 *)xfer->rx_buf)[elements++] = w; | |
563 | else /* word_len <= 32 */ | |
564 | ((u32 *)xfer->rx_buf)[elements++] = w; | |
565 | } else { | |
566 | int bytes_per_word = mcspi_bytes_per_word(word_len); | |
567 | dev_err(&spi->dev, "DMA RX penultimate word empty\n"); | |
568 | count -= (bytes_per_word << 1); | |
569 | omap2_mcspi_set_enable(spi, 1); | |
570 | return count; | |
571 | } | |
572 | } | |
573 | if (!mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_RXS)) { | |
574 | u32 w; | |
575 | ||
576 | w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0); | |
577 | if (word_len <= 8) | |
578 | ((u8 *)xfer->rx_buf)[elements] = w; | |
579 | else if (word_len <= 16) | |
580 | ((u16 *)xfer->rx_buf)[elements] = w; | |
581 | else /* word_len <= 32 */ | |
582 | ((u32 *)xfer->rx_buf)[elements] = w; | |
583 | } else { | |
584 | dev_err(&spi->dev, "DMA RX last word empty\n"); | |
585 | count -= mcspi_bytes_per_word(word_len); | |
586 | } | |
587 | omap2_mcspi_set_enable(spi, 1); | |
588 | return count; | |
589 | } | |
590 | ||
591 | static unsigned | |
592 | omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer) | |
593 | { | |
594 | struct omap2_mcspi *mcspi; | |
595 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
596 | struct omap2_mcspi_dma *mcspi_dma; | |
597 | unsigned int count; | |
598 | u32 l; | |
599 | u8 *rx; | |
600 | const u8 *tx; | |
601 | struct dma_slave_config cfg; | |
602 | enum dma_slave_buswidth width; | |
603 | unsigned es; | |
604 | u32 burst; | |
605 | void __iomem *chstat_reg; | |
606 | void __iomem *irqstat_reg; | |
607 | int wait_res; | |
608 | ||
609 | mcspi = spi_master_get_devdata(spi->master); | |
610 | mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
611 | l = mcspi_cached_chconf0(spi); | |
612 | ||
613 | ||
614 | if (cs->word_len <= 8) { | |
615 | width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
616 | es = 1; | |
617 | } else if (cs->word_len <= 16) { | |
618 | width = DMA_SLAVE_BUSWIDTH_2_BYTES; | |
619 | es = 2; | |
620 | } else { | |
621 | width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
622 | es = 4; | |
623 | } | |
624 | ||
625 | count = xfer->len; | |
626 | burst = 1; | |
627 | ||
628 | if (mcspi->fifo_depth > 0) { | |
629 | if (count > mcspi->fifo_depth) | |
630 | burst = mcspi->fifo_depth / es; | |
631 | else | |
632 | burst = count / es; | |
633 | } | |
634 | ||
635 | memset(&cfg, 0, sizeof(cfg)); | |
636 | cfg.src_addr = cs->phys + OMAP2_MCSPI_RX0; | |
637 | cfg.dst_addr = cs->phys + OMAP2_MCSPI_TX0; | |
638 | cfg.src_addr_width = width; | |
639 | cfg.dst_addr_width = width; | |
640 | cfg.src_maxburst = burst; | |
641 | cfg.dst_maxburst = burst; | |
642 | ||
643 | rx = xfer->rx_buf; | |
644 | tx = xfer->tx_buf; | |
645 | ||
646 | if (tx != NULL) | |
647 | omap2_mcspi_tx_dma(spi, xfer, cfg); | |
648 | ||
649 | if (rx != NULL) | |
650 | count = omap2_mcspi_rx_dma(spi, xfer, cfg, es); | |
651 | ||
652 | if (tx != NULL) { | |
653 | wait_for_completion(&mcspi_dma->dma_tx_completion); | |
654 | ||
655 | if (mcspi->fifo_depth > 0) { | |
656 | irqstat_reg = mcspi->base + OMAP2_MCSPI_IRQSTATUS; | |
657 | ||
658 | if (mcspi_wait_for_reg_bit(irqstat_reg, | |
659 | OMAP2_MCSPI_IRQSTATUS_EOW) < 0) | |
660 | dev_err(&spi->dev, "EOW timed out\n"); | |
661 | ||
662 | mcspi_write_reg(mcspi->master, OMAP2_MCSPI_IRQSTATUS, | |
663 | OMAP2_MCSPI_IRQSTATUS_EOW); | |
664 | } | |
665 | ||
666 | /* for TX_ONLY mode, be sure all words have shifted out */ | |
667 | if (rx == NULL) { | |
668 | chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0; | |
669 | if (mcspi->fifo_depth > 0) { | |
670 | wait_res = mcspi_wait_for_reg_bit(chstat_reg, | |
671 | OMAP2_MCSPI_CHSTAT_TXFFE); | |
672 | if (wait_res < 0) | |
673 | dev_err(&spi->dev, "TXFFE timed out\n"); | |
674 | } else { | |
675 | wait_res = mcspi_wait_for_reg_bit(chstat_reg, | |
676 | OMAP2_MCSPI_CHSTAT_TXS); | |
677 | if (wait_res < 0) | |
678 | dev_err(&spi->dev, "TXS timed out\n"); | |
679 | } | |
680 | if (wait_res >= 0 && | |
681 | (mcspi_wait_for_reg_bit(chstat_reg, | |
682 | OMAP2_MCSPI_CHSTAT_EOT) < 0)) | |
683 | dev_err(&spi->dev, "EOT timed out\n"); | |
684 | } | |
685 | } | |
686 | return count; | |
687 | } | |
688 | ||
689 | static unsigned | |
690 | omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) | |
691 | { | |
692 | struct omap2_mcspi *mcspi; | |
693 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
694 | unsigned int count, c; | |
695 | u32 l; | |
696 | void __iomem *base = cs->base; | |
697 | void __iomem *tx_reg; | |
698 | void __iomem *rx_reg; | |
699 | void __iomem *chstat_reg; | |
700 | int word_len; | |
701 | ||
702 | mcspi = spi_master_get_devdata(spi->master); | |
703 | count = xfer->len; | |
704 | c = count; | |
705 | word_len = cs->word_len; | |
706 | ||
707 | l = mcspi_cached_chconf0(spi); | |
708 | ||
709 | /* We store the pre-calculated register addresses on stack to speed | |
710 | * up the transfer loop. */ | |
711 | tx_reg = base + OMAP2_MCSPI_TX0; | |
712 | rx_reg = base + OMAP2_MCSPI_RX0; | |
713 | chstat_reg = base + OMAP2_MCSPI_CHSTAT0; | |
714 | ||
715 | if (c < (word_len>>3)) | |
716 | return 0; | |
717 | ||
718 | if (word_len <= 8) { | |
719 | u8 *rx; | |
720 | const u8 *tx; | |
721 | ||
722 | rx = xfer->rx_buf; | |
723 | tx = xfer->tx_buf; | |
724 | ||
725 | do { | |
726 | c -= 1; | |
727 | if (tx != NULL) { | |
728 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
729 | OMAP2_MCSPI_CHSTAT_TXS) < 0) { | |
730 | dev_err(&spi->dev, "TXS timed out\n"); | |
731 | goto out; | |
732 | } | |
733 | dev_vdbg(&spi->dev, "write-%d %02x\n", | |
734 | word_len, *tx); | |
735 | writel_relaxed(*tx++, tx_reg); | |
736 | } | |
737 | if (rx != NULL) { | |
738 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
739 | OMAP2_MCSPI_CHSTAT_RXS) < 0) { | |
740 | dev_err(&spi->dev, "RXS timed out\n"); | |
741 | goto out; | |
742 | } | |
743 | ||
744 | if (c == 1 && tx == NULL && | |
745 | (l & OMAP2_MCSPI_CHCONF_TURBO)) { | |
746 | omap2_mcspi_set_enable(spi, 0); | |
747 | *rx++ = readl_relaxed(rx_reg); | |
748 | dev_vdbg(&spi->dev, "read-%d %02x\n", | |
749 | word_len, *(rx - 1)); | |
750 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
751 | OMAP2_MCSPI_CHSTAT_RXS) < 0) { | |
752 | dev_err(&spi->dev, | |
753 | "RXS timed out\n"); | |
754 | goto out; | |
755 | } | |
756 | c = 0; | |
757 | } else if (c == 0 && tx == NULL) { | |
758 | omap2_mcspi_set_enable(spi, 0); | |
759 | } | |
760 | ||
761 | *rx++ = readl_relaxed(rx_reg); | |
762 | dev_vdbg(&spi->dev, "read-%d %02x\n", | |
763 | word_len, *(rx - 1)); | |
764 | } | |
765 | } while (c); | |
766 | } else if (word_len <= 16) { | |
767 | u16 *rx; | |
768 | const u16 *tx; | |
769 | ||
770 | rx = xfer->rx_buf; | |
771 | tx = xfer->tx_buf; | |
772 | do { | |
773 | c -= 2; | |
774 | if (tx != NULL) { | |
775 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
776 | OMAP2_MCSPI_CHSTAT_TXS) < 0) { | |
777 | dev_err(&spi->dev, "TXS timed out\n"); | |
778 | goto out; | |
779 | } | |
780 | dev_vdbg(&spi->dev, "write-%d %04x\n", | |
781 | word_len, *tx); | |
782 | writel_relaxed(*tx++, tx_reg); | |
783 | } | |
784 | if (rx != NULL) { | |
785 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
786 | OMAP2_MCSPI_CHSTAT_RXS) < 0) { | |
787 | dev_err(&spi->dev, "RXS timed out\n"); | |
788 | goto out; | |
789 | } | |
790 | ||
791 | if (c == 2 && tx == NULL && | |
792 | (l & OMAP2_MCSPI_CHCONF_TURBO)) { | |
793 | omap2_mcspi_set_enable(spi, 0); | |
794 | *rx++ = readl_relaxed(rx_reg); | |
795 | dev_vdbg(&spi->dev, "read-%d %04x\n", | |
796 | word_len, *(rx - 1)); | |
797 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
798 | OMAP2_MCSPI_CHSTAT_RXS) < 0) { | |
799 | dev_err(&spi->dev, | |
800 | "RXS timed out\n"); | |
801 | goto out; | |
802 | } | |
803 | c = 0; | |
804 | } else if (c == 0 && tx == NULL) { | |
805 | omap2_mcspi_set_enable(spi, 0); | |
806 | } | |
807 | ||
808 | *rx++ = readl_relaxed(rx_reg); | |
809 | dev_vdbg(&spi->dev, "read-%d %04x\n", | |
810 | word_len, *(rx - 1)); | |
811 | } | |
812 | } while (c >= 2); | |
813 | } else if (word_len <= 32) { | |
814 | u32 *rx; | |
815 | const u32 *tx; | |
816 | ||
817 | rx = xfer->rx_buf; | |
818 | tx = xfer->tx_buf; | |
819 | do { | |
820 | c -= 4; | |
821 | if (tx != NULL) { | |
822 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
823 | OMAP2_MCSPI_CHSTAT_TXS) < 0) { | |
824 | dev_err(&spi->dev, "TXS timed out\n"); | |
825 | goto out; | |
826 | } | |
827 | dev_vdbg(&spi->dev, "write-%d %08x\n", | |
828 | word_len, *tx); | |
829 | writel_relaxed(*tx++, tx_reg); | |
830 | } | |
831 | if (rx != NULL) { | |
832 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
833 | OMAP2_MCSPI_CHSTAT_RXS) < 0) { | |
834 | dev_err(&spi->dev, "RXS timed out\n"); | |
835 | goto out; | |
836 | } | |
837 | ||
838 | if (c == 4 && tx == NULL && | |
839 | (l & OMAP2_MCSPI_CHCONF_TURBO)) { | |
840 | omap2_mcspi_set_enable(spi, 0); | |
841 | *rx++ = readl_relaxed(rx_reg); | |
842 | dev_vdbg(&spi->dev, "read-%d %08x\n", | |
843 | word_len, *(rx - 1)); | |
844 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
845 | OMAP2_MCSPI_CHSTAT_RXS) < 0) { | |
846 | dev_err(&spi->dev, | |
847 | "RXS timed out\n"); | |
848 | goto out; | |
849 | } | |
850 | c = 0; | |
851 | } else if (c == 0 && tx == NULL) { | |
852 | omap2_mcspi_set_enable(spi, 0); | |
853 | } | |
854 | ||
855 | *rx++ = readl_relaxed(rx_reg); | |
856 | dev_vdbg(&spi->dev, "read-%d %08x\n", | |
857 | word_len, *(rx - 1)); | |
858 | } | |
859 | } while (c >= 4); | |
860 | } | |
861 | ||
862 | /* for TX_ONLY mode, be sure all words have shifted out */ | |
863 | if (xfer->rx_buf == NULL) { | |
864 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
865 | OMAP2_MCSPI_CHSTAT_TXS) < 0) { | |
866 | dev_err(&spi->dev, "TXS timed out\n"); | |
867 | } else if (mcspi_wait_for_reg_bit(chstat_reg, | |
868 | OMAP2_MCSPI_CHSTAT_EOT) < 0) | |
869 | dev_err(&spi->dev, "EOT timed out\n"); | |
870 | ||
871 | /* disable chan to purge rx datas received in TX_ONLY transfer, | |
872 | * otherwise these rx datas will affect the direct following | |
873 | * RX_ONLY transfer. | |
874 | */ | |
875 | omap2_mcspi_set_enable(spi, 0); | |
876 | } | |
877 | out: | |
878 | omap2_mcspi_set_enable(spi, 1); | |
879 | return count - c; | |
880 | } | |
881 | ||
882 | static u32 omap2_mcspi_calc_divisor(u32 speed_hz) | |
883 | { | |
884 | u32 div; | |
885 | ||
886 | for (div = 0; div < 15; div++) | |
887 | if (speed_hz >= (OMAP2_MCSPI_MAX_FREQ >> div)) | |
888 | return div; | |
889 | ||
890 | return 15; | |
891 | } | |
892 | ||
893 | /* called only when no transfer is active to this device */ | |
894 | static int omap2_mcspi_setup_transfer(struct spi_device *spi, | |
895 | struct spi_transfer *t) | |
896 | { | |
897 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
898 | struct omap2_mcspi *mcspi; | |
899 | struct spi_master *spi_cntrl; | |
900 | u32 l = 0, clkd = 0, div, extclk = 0, clkg = 0; | |
901 | u8 word_len = spi->bits_per_word; | |
902 | u32 speed_hz = spi->max_speed_hz; | |
903 | ||
904 | mcspi = spi_master_get_devdata(spi->master); | |
905 | spi_cntrl = mcspi->master; | |
906 | ||
907 | if (t != NULL && t->bits_per_word) | |
908 | word_len = t->bits_per_word; | |
909 | ||
910 | cs->word_len = word_len; | |
911 | ||
912 | if (t && t->speed_hz) | |
913 | speed_hz = t->speed_hz; | |
914 | ||
915 | speed_hz = min_t(u32, speed_hz, OMAP2_MCSPI_MAX_FREQ); | |
916 | if (speed_hz < (OMAP2_MCSPI_MAX_FREQ / OMAP2_MCSPI_MAX_DIVIDER)) { | |
917 | clkd = omap2_mcspi_calc_divisor(speed_hz); | |
918 | speed_hz = OMAP2_MCSPI_MAX_FREQ >> clkd; | |
919 | clkg = 0; | |
920 | } else { | |
921 | div = (OMAP2_MCSPI_MAX_FREQ + speed_hz - 1) / speed_hz; | |
922 | speed_hz = OMAP2_MCSPI_MAX_FREQ / div; | |
923 | clkd = (div - 1) & 0xf; | |
924 | extclk = (div - 1) >> 4; | |
925 | clkg = OMAP2_MCSPI_CHCONF_CLKG; | |
926 | } | |
927 | ||
928 | l = mcspi_cached_chconf0(spi); | |
929 | ||
930 | /* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS | |
931 | * REVISIT: this controller could support SPI_3WIRE mode. | |
932 | */ | |
933 | if (mcspi->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) { | |
934 | l &= ~OMAP2_MCSPI_CHCONF_IS; | |
935 | l &= ~OMAP2_MCSPI_CHCONF_DPE1; | |
936 | l |= OMAP2_MCSPI_CHCONF_DPE0; | |
937 | } else { | |
938 | l |= OMAP2_MCSPI_CHCONF_IS; | |
939 | l |= OMAP2_MCSPI_CHCONF_DPE1; | |
940 | l &= ~OMAP2_MCSPI_CHCONF_DPE0; | |
941 | } | |
942 | ||
943 | /* wordlength */ | |
944 | l &= ~OMAP2_MCSPI_CHCONF_WL_MASK; | |
945 | l |= (word_len - 1) << 7; | |
946 | ||
947 | /* set chipselect polarity; manage with FORCE */ | |
948 | if (!(spi->mode & SPI_CS_HIGH)) | |
949 | l |= OMAP2_MCSPI_CHCONF_EPOL; /* active-low; normal */ | |
950 | else | |
951 | l &= ~OMAP2_MCSPI_CHCONF_EPOL; | |
952 | ||
953 | /* set clock divisor */ | |
954 | l &= ~OMAP2_MCSPI_CHCONF_CLKD_MASK; | |
955 | l |= clkd << 2; | |
956 | ||
957 | /* set clock granularity */ | |
958 | l &= ~OMAP2_MCSPI_CHCONF_CLKG; | |
959 | l |= clkg; | |
960 | if (clkg) { | |
961 | cs->chctrl0 &= ~OMAP2_MCSPI_CHCTRL_EXTCLK_MASK; | |
962 | cs->chctrl0 |= extclk << 8; | |
963 | mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, cs->chctrl0); | |
964 | } | |
965 | ||
966 | /* set SPI mode 0..3 */ | |
967 | if (spi->mode & SPI_CPOL) | |
968 | l |= OMAP2_MCSPI_CHCONF_POL; | |
969 | else | |
970 | l &= ~OMAP2_MCSPI_CHCONF_POL; | |
971 | if (spi->mode & SPI_CPHA) | |
972 | l |= OMAP2_MCSPI_CHCONF_PHA; | |
973 | else | |
974 | l &= ~OMAP2_MCSPI_CHCONF_PHA; | |
975 | ||
976 | mcspi_write_chconf0(spi, l); | |
977 | ||
978 | cs->mode = spi->mode; | |
979 | ||
980 | dev_dbg(&spi->dev, "setup: speed %d, sample %s edge, clk %s\n", | |
981 | speed_hz, | |
982 | (spi->mode & SPI_CPHA) ? "trailing" : "leading", | |
983 | (spi->mode & SPI_CPOL) ? "inverted" : "normal"); | |
984 | ||
985 | return 0; | |
986 | } | |
987 | ||
988 | /* | |
989 | * Note that we currently allow DMA only if we get a channel | |
990 | * for both rx and tx. Otherwise we'll do PIO for both rx and tx. | |
991 | */ | |
992 | static int omap2_mcspi_request_dma(struct spi_device *spi) | |
993 | { | |
994 | struct spi_master *master = spi->master; | |
995 | struct omap2_mcspi *mcspi; | |
996 | struct omap2_mcspi_dma *mcspi_dma; | |
997 | int ret = 0; | |
998 | ||
999 | mcspi = spi_master_get_devdata(master); | |
1000 | mcspi_dma = mcspi->dma_channels + spi->chip_select; | |
1001 | ||
1002 | init_completion(&mcspi_dma->dma_rx_completion); | |
1003 | init_completion(&mcspi_dma->dma_tx_completion); | |
1004 | ||
1005 | mcspi_dma->dma_rx = dma_request_chan(&master->dev, | |
1006 | mcspi_dma->dma_rx_ch_name); | |
1007 | if (IS_ERR(mcspi_dma->dma_rx)) { | |
1008 | ret = PTR_ERR(mcspi_dma->dma_rx); | |
1009 | mcspi_dma->dma_rx = NULL; | |
1010 | goto no_dma; | |
1011 | } | |
1012 | ||
1013 | mcspi_dma->dma_tx = dma_request_chan(&master->dev, | |
1014 | mcspi_dma->dma_tx_ch_name); | |
1015 | if (IS_ERR(mcspi_dma->dma_tx)) { | |
1016 | ret = PTR_ERR(mcspi_dma->dma_tx); | |
1017 | mcspi_dma->dma_tx = NULL; | |
1018 | dma_release_channel(mcspi_dma->dma_rx); | |
1019 | mcspi_dma->dma_rx = NULL; | |
1020 | } | |
1021 | ||
1022 | no_dma: | |
1023 | return ret; | |
1024 | } | |
1025 | ||
1026 | static int omap2_mcspi_setup(struct spi_device *spi) | |
1027 | { | |
1028 | int ret; | |
1029 | struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); | |
1030 | struct omap2_mcspi_regs *ctx = &mcspi->ctx; | |
1031 | struct omap2_mcspi_dma *mcspi_dma; | |
1032 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
1033 | ||
1034 | mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
1035 | ||
1036 | if (!cs) { | |
1037 | cs = kzalloc(sizeof *cs, GFP_KERNEL); | |
1038 | if (!cs) | |
1039 | return -ENOMEM; | |
1040 | cs->base = mcspi->base + spi->chip_select * 0x14; | |
1041 | cs->phys = mcspi->phys + spi->chip_select * 0x14; | |
1042 | cs->mode = 0; | |
1043 | cs->chconf0 = 0; | |
1044 | cs->chctrl0 = 0; | |
1045 | spi->controller_state = cs; | |
1046 | /* Link this to context save list */ | |
1047 | list_add_tail(&cs->node, &ctx->cs); | |
1048 | ||
1049 | if (gpio_is_valid(spi->cs_gpio)) { | |
1050 | ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev)); | |
1051 | if (ret) { | |
1052 | dev_err(&spi->dev, "failed to request gpio\n"); | |
1053 | return ret; | |
1054 | } | |
1055 | gpio_direction_output(spi->cs_gpio, | |
1056 | !(spi->mode & SPI_CS_HIGH)); | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | if (!mcspi_dma->dma_rx || !mcspi_dma->dma_tx) { | |
1061 | ret = omap2_mcspi_request_dma(spi); | |
1062 | if (ret) | |
1063 | dev_warn(&spi->dev, "not using DMA for McSPI (%d)\n", | |
1064 | ret); | |
1065 | } | |
1066 | ||
1067 | ret = pm_runtime_get_sync(mcspi->dev); | |
1068 | if (ret < 0) | |
1069 | return ret; | |
1070 | ||
1071 | ret = omap2_mcspi_setup_transfer(spi, NULL); | |
1072 | pm_runtime_mark_last_busy(mcspi->dev); | |
1073 | pm_runtime_put_autosuspend(mcspi->dev); | |
1074 | ||
1075 | return ret; | |
1076 | } | |
1077 | ||
1078 | static void omap2_mcspi_cleanup(struct spi_device *spi) | |
1079 | { | |
1080 | struct omap2_mcspi *mcspi; | |
1081 | struct omap2_mcspi_dma *mcspi_dma; | |
1082 | struct omap2_mcspi_cs *cs; | |
1083 | ||
1084 | mcspi = spi_master_get_devdata(spi->master); | |
1085 | ||
1086 | if (spi->controller_state) { | |
1087 | /* Unlink controller state from context save list */ | |
1088 | cs = spi->controller_state; | |
1089 | list_del(&cs->node); | |
1090 | ||
1091 | kfree(cs); | |
1092 | } | |
1093 | ||
1094 | if (spi->chip_select < spi->master->num_chipselect) { | |
1095 | mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
1096 | ||
1097 | if (mcspi_dma->dma_rx) { | |
1098 | dma_release_channel(mcspi_dma->dma_rx); | |
1099 | mcspi_dma->dma_rx = NULL; | |
1100 | } | |
1101 | if (mcspi_dma->dma_tx) { | |
1102 | dma_release_channel(mcspi_dma->dma_tx); | |
1103 | mcspi_dma->dma_tx = NULL; | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | if (gpio_is_valid(spi->cs_gpio)) | |
1108 | gpio_free(spi->cs_gpio); | |
1109 | } | |
1110 | ||
1111 | static int omap2_mcspi_transfer_one(struct spi_master *master, | |
1112 | struct spi_device *spi, | |
1113 | struct spi_transfer *t) | |
1114 | { | |
1115 | ||
1116 | /* We only enable one channel at a time -- the one whose message is | |
1117 | * -- although this controller would gladly | |
1118 | * arbitrate among multiple channels. This corresponds to "single | |
1119 | * channel" master mode. As a side effect, we need to manage the | |
1120 | * chipselect with the FORCE bit ... CS != channel enable. | |
1121 | */ | |
1122 | ||
1123 | struct omap2_mcspi *mcspi; | |
1124 | struct omap2_mcspi_dma *mcspi_dma; | |
1125 | struct omap2_mcspi_cs *cs; | |
1126 | struct omap2_mcspi_device_config *cd; | |
1127 | int par_override = 0; | |
1128 | int status = 0; | |
1129 | u32 chconf; | |
1130 | ||
1131 | mcspi = spi_master_get_devdata(master); | |
1132 | mcspi_dma = mcspi->dma_channels + spi->chip_select; | |
1133 | cs = spi->controller_state; | |
1134 | cd = spi->controller_data; | |
1135 | ||
1136 | /* | |
1137 | * The slave driver could have changed spi->mode in which case | |
1138 | * it will be different from cs->mode (the current hardware setup). | |
1139 | * If so, set par_override (even though its not a parity issue) so | |
1140 | * omap2_mcspi_setup_transfer will be called to configure the hardware | |
1141 | * with the correct mode on the first iteration of the loop below. | |
1142 | */ | |
1143 | if (spi->mode != cs->mode) | |
1144 | par_override = 1; | |
1145 | ||
1146 | omap2_mcspi_set_enable(spi, 0); | |
1147 | ||
1148 | if (gpio_is_valid(spi->cs_gpio)) | |
1149 | omap2_mcspi_set_cs(spi, spi->mode & SPI_CS_HIGH); | |
1150 | ||
1151 | if (par_override || | |
1152 | (t->speed_hz != spi->max_speed_hz) || | |
1153 | (t->bits_per_word != spi->bits_per_word)) { | |
1154 | par_override = 1; | |
1155 | status = omap2_mcspi_setup_transfer(spi, t); | |
1156 | if (status < 0) | |
1157 | goto out; | |
1158 | if (t->speed_hz == spi->max_speed_hz && | |
1159 | t->bits_per_word == spi->bits_per_word) | |
1160 | par_override = 0; | |
1161 | } | |
1162 | if (cd && cd->cs_per_word) { | |
1163 | chconf = mcspi->ctx.modulctrl; | |
1164 | chconf &= ~OMAP2_MCSPI_MODULCTRL_SINGLE; | |
1165 | mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, chconf); | |
1166 | mcspi->ctx.modulctrl = | |
1167 | mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL); | |
1168 | } | |
1169 | ||
1170 | chconf = mcspi_cached_chconf0(spi); | |
1171 | chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK; | |
1172 | chconf &= ~OMAP2_MCSPI_CHCONF_TURBO; | |
1173 | ||
1174 | if (t->tx_buf == NULL) | |
1175 | chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY; | |
1176 | else if (t->rx_buf == NULL) | |
1177 | chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY; | |
1178 | ||
1179 | if (cd && cd->turbo_mode && t->tx_buf == NULL) { | |
1180 | /* Turbo mode is for more than one word */ | |
1181 | if (t->len > ((cs->word_len + 7) >> 3)) | |
1182 | chconf |= OMAP2_MCSPI_CHCONF_TURBO; | |
1183 | } | |
1184 | ||
1185 | mcspi_write_chconf0(spi, chconf); | |
1186 | ||
1187 | if (t->len) { | |
1188 | unsigned count; | |
1189 | ||
1190 | if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) && | |
1191 | master->cur_msg_mapped && | |
1192 | master->can_dma(master, spi, t)) | |
1193 | omap2_mcspi_set_fifo(spi, t, 1); | |
1194 | ||
1195 | omap2_mcspi_set_enable(spi, 1); | |
1196 | ||
1197 | /* RX_ONLY mode needs dummy data in TX reg */ | |
1198 | if (t->tx_buf == NULL) | |
1199 | writel_relaxed(0, cs->base | |
1200 | + OMAP2_MCSPI_TX0); | |
1201 | ||
1202 | if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) && | |
1203 | master->cur_msg_mapped && | |
1204 | master->can_dma(master, spi, t)) | |
1205 | count = omap2_mcspi_txrx_dma(spi, t); | |
1206 | else | |
1207 | count = omap2_mcspi_txrx_pio(spi, t); | |
1208 | ||
1209 | if (count != t->len) { | |
1210 | status = -EIO; | |
1211 | goto out; | |
1212 | } | |
1213 | } | |
1214 | ||
1215 | omap2_mcspi_set_enable(spi, 0); | |
1216 | ||
1217 | if (mcspi->fifo_depth > 0) | |
1218 | omap2_mcspi_set_fifo(spi, t, 0); | |
1219 | ||
1220 | out: | |
1221 | /* Restore defaults if they were overriden */ | |
1222 | if (par_override) { | |
1223 | par_override = 0; | |
1224 | status = omap2_mcspi_setup_transfer(spi, NULL); | |
1225 | } | |
1226 | ||
1227 | if (cd && cd->cs_per_word) { | |
1228 | chconf = mcspi->ctx.modulctrl; | |
1229 | chconf |= OMAP2_MCSPI_MODULCTRL_SINGLE; | |
1230 | mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, chconf); | |
1231 | mcspi->ctx.modulctrl = | |
1232 | mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL); | |
1233 | } | |
1234 | ||
1235 | omap2_mcspi_set_enable(spi, 0); | |
1236 | ||
1237 | if (gpio_is_valid(spi->cs_gpio)) | |
1238 | omap2_mcspi_set_cs(spi, !(spi->mode & SPI_CS_HIGH)); | |
1239 | ||
1240 | if (mcspi->fifo_depth > 0 && t) | |
1241 | omap2_mcspi_set_fifo(spi, t, 0); | |
1242 | ||
1243 | return status; | |
1244 | } | |
1245 | ||
1246 | static int omap2_mcspi_prepare_message(struct spi_master *master, | |
1247 | struct spi_message *msg) | |
1248 | { | |
1249 | struct omap2_mcspi *mcspi = spi_master_get_devdata(master); | |
1250 | struct omap2_mcspi_regs *ctx = &mcspi->ctx; | |
1251 | struct omap2_mcspi_cs *cs; | |
1252 | ||
1253 | /* Only a single channel can have the FORCE bit enabled | |
1254 | * in its chconf0 register. | |
1255 | * Scan all channels and disable them except the current one. | |
1256 | * A FORCE can remain from a last transfer having cs_change enabled | |
1257 | */ | |
1258 | list_for_each_entry(cs, &ctx->cs, node) { | |
1259 | if (msg->spi->controller_state == cs) | |
1260 | continue; | |
1261 | ||
1262 | if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE)) { | |
1263 | cs->chconf0 &= ~OMAP2_MCSPI_CHCONF_FORCE; | |
1264 | writel_relaxed(cs->chconf0, | |
1265 | cs->base + OMAP2_MCSPI_CHCONF0); | |
1266 | readl_relaxed(cs->base + OMAP2_MCSPI_CHCONF0); | |
1267 | } | |
1268 | } | |
1269 | ||
1270 | return 0; | |
1271 | } | |
1272 | ||
1273 | static bool omap2_mcspi_can_dma(struct spi_master *master, | |
1274 | struct spi_device *spi, | |
1275 | struct spi_transfer *xfer) | |
1276 | { | |
1277 | return (xfer->len >= DMA_MIN_BYTES); | |
1278 | } | |
1279 | ||
1280 | static int omap2_mcspi_master_setup(struct omap2_mcspi *mcspi) | |
1281 | { | |
1282 | struct spi_master *master = mcspi->master; | |
1283 | struct omap2_mcspi_regs *ctx = &mcspi->ctx; | |
1284 | int ret = 0; | |
1285 | ||
1286 | ret = pm_runtime_get_sync(mcspi->dev); | |
1287 | if (ret < 0) | |
1288 | return ret; | |
1289 | ||
1290 | mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE, | |
1291 | OMAP2_MCSPI_WAKEUPENABLE_WKEN); | |
1292 | ctx->wakeupenable = OMAP2_MCSPI_WAKEUPENABLE_WKEN; | |
1293 | ||
1294 | omap2_mcspi_set_master_mode(master); | |
1295 | pm_runtime_mark_last_busy(mcspi->dev); | |
1296 | pm_runtime_put_autosuspend(mcspi->dev); | |
1297 | return 0; | |
1298 | } | |
1299 | ||
1300 | static int omap_mcspi_runtime_resume(struct device *dev) | |
1301 | { | |
1302 | struct omap2_mcspi *mcspi; | |
1303 | struct spi_master *master; | |
1304 | ||
1305 | master = dev_get_drvdata(dev); | |
1306 | mcspi = spi_master_get_devdata(master); | |
1307 | omap2_mcspi_restore_ctx(mcspi); | |
1308 | ||
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | static struct omap2_mcspi_platform_config omap2_pdata = { | |
1313 | .regs_offset = 0, | |
1314 | }; | |
1315 | ||
1316 | static struct omap2_mcspi_platform_config omap4_pdata = { | |
1317 | .regs_offset = OMAP4_MCSPI_REG_OFFSET, | |
1318 | }; | |
1319 | ||
1320 | static const struct of_device_id omap_mcspi_of_match[] = { | |
1321 | { | |
1322 | .compatible = "ti,omap2-mcspi", | |
1323 | .data = &omap2_pdata, | |
1324 | }, | |
1325 | { | |
1326 | .compatible = "ti,omap4-mcspi", | |
1327 | .data = &omap4_pdata, | |
1328 | }, | |
1329 | { }, | |
1330 | }; | |
1331 | MODULE_DEVICE_TABLE(of, omap_mcspi_of_match); | |
1332 | ||
1333 | static int omap2_mcspi_probe(struct platform_device *pdev) | |
1334 | { | |
1335 | struct spi_master *master; | |
1336 | const struct omap2_mcspi_platform_config *pdata; | |
1337 | struct omap2_mcspi *mcspi; | |
1338 | struct resource *r; | |
1339 | int status = 0, i; | |
1340 | u32 regs_offset = 0; | |
1341 | static int bus_num = 1; | |
1342 | struct device_node *node = pdev->dev.of_node; | |
1343 | const struct of_device_id *match; | |
1344 | ||
1345 | master = spi_alloc_master(&pdev->dev, sizeof *mcspi); | |
1346 | if (master == NULL) { | |
1347 | dev_dbg(&pdev->dev, "master allocation failed\n"); | |
1348 | return -ENOMEM; | |
1349 | } | |
1350 | ||
1351 | /* the spi->mode bits understood by this driver: */ | |
1352 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; | |
1353 | master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); | |
1354 | master->setup = omap2_mcspi_setup; | |
1355 | master->auto_runtime_pm = true; | |
1356 | master->prepare_message = omap2_mcspi_prepare_message; | |
1357 | master->can_dma = omap2_mcspi_can_dma; | |
1358 | master->transfer_one = omap2_mcspi_transfer_one; | |
1359 | master->set_cs = omap2_mcspi_set_cs; | |
1360 | master->cleanup = omap2_mcspi_cleanup; | |
1361 | master->dev.of_node = node; | |
1362 | master->max_speed_hz = OMAP2_MCSPI_MAX_FREQ; | |
1363 | master->min_speed_hz = OMAP2_MCSPI_MAX_FREQ >> 15; | |
1364 | ||
1365 | platform_set_drvdata(pdev, master); | |
1366 | ||
1367 | mcspi = spi_master_get_devdata(master); | |
1368 | mcspi->master = master; | |
1369 | ||
1370 | match = of_match_device(omap_mcspi_of_match, &pdev->dev); | |
1371 | if (match) { | |
1372 | u32 num_cs = 1; /* default number of chipselect */ | |
1373 | pdata = match->data; | |
1374 | ||
1375 | of_property_read_u32(node, "ti,spi-num-cs", &num_cs); | |
1376 | master->num_chipselect = num_cs; | |
1377 | master->bus_num = bus_num++; | |
1378 | if (of_get_property(node, "ti,pindir-d0-out-d1-in", NULL)) | |
1379 | mcspi->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN; | |
1380 | } else { | |
1381 | pdata = dev_get_platdata(&pdev->dev); | |
1382 | master->num_chipselect = pdata->num_cs; | |
1383 | if (pdev->id != -1) | |
1384 | master->bus_num = pdev->id; | |
1385 | mcspi->pin_dir = pdata->pin_dir; | |
1386 | } | |
1387 | regs_offset = pdata->regs_offset; | |
1388 | ||
1389 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1390 | mcspi->base = devm_ioremap_resource(&pdev->dev, r); | |
1391 | if (IS_ERR(mcspi->base)) { | |
1392 | status = PTR_ERR(mcspi->base); | |
1393 | goto free_master; | |
1394 | } | |
1395 | mcspi->phys = r->start + regs_offset; | |
1396 | mcspi->base += regs_offset; | |
1397 | ||
1398 | mcspi->dev = &pdev->dev; | |
1399 | ||
1400 | INIT_LIST_HEAD(&mcspi->ctx.cs); | |
1401 | ||
1402 | mcspi->dma_channels = devm_kcalloc(&pdev->dev, master->num_chipselect, | |
1403 | sizeof(struct omap2_mcspi_dma), | |
1404 | GFP_KERNEL); | |
1405 | if (mcspi->dma_channels == NULL) { | |
1406 | status = -ENOMEM; | |
1407 | goto free_master; | |
1408 | } | |
1409 | ||
1410 | for (i = 0; i < master->num_chipselect; i++) { | |
1411 | sprintf(mcspi->dma_channels[i].dma_rx_ch_name, "rx%d", i); | |
1412 | sprintf(mcspi->dma_channels[i].dma_tx_ch_name, "tx%d", i); | |
1413 | } | |
1414 | ||
1415 | pm_runtime_use_autosuspend(&pdev->dev); | |
1416 | pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT); | |
1417 | pm_runtime_enable(&pdev->dev); | |
1418 | ||
1419 | status = omap2_mcspi_master_setup(mcspi); | |
1420 | if (status < 0) | |
1421 | goto disable_pm; | |
1422 | ||
1423 | status = devm_spi_register_master(&pdev->dev, master); | |
1424 | if (status < 0) | |
1425 | goto disable_pm; | |
1426 | ||
1427 | return status; | |
1428 | ||
1429 | disable_pm: | |
1430 | pm_runtime_dont_use_autosuspend(&pdev->dev); | |
1431 | pm_runtime_put_sync(&pdev->dev); | |
1432 | pm_runtime_disable(&pdev->dev); | |
1433 | free_master: | |
1434 | spi_master_put(master); | |
1435 | return status; | |
1436 | } | |
1437 | ||
1438 | static int omap2_mcspi_remove(struct platform_device *pdev) | |
1439 | { | |
1440 | struct spi_master *master = platform_get_drvdata(pdev); | |
1441 | struct omap2_mcspi *mcspi = spi_master_get_devdata(master); | |
1442 | ||
1443 | pm_runtime_dont_use_autosuspend(mcspi->dev); | |
1444 | pm_runtime_put_sync(mcspi->dev); | |
1445 | pm_runtime_disable(&pdev->dev); | |
1446 | ||
1447 | return 0; | |
1448 | } | |
1449 | ||
1450 | /* work with hotplug and coldplug */ | |
1451 | MODULE_ALIAS("platform:omap2_mcspi"); | |
1452 | ||
1453 | #ifdef CONFIG_SUSPEND | |
1454 | /* | |
1455 | * When SPI wake up from off-mode, CS is in activate state. If it was in | |
1456 | * unactive state when driver was suspend, then force it to unactive state at | |
1457 | * wake up. | |
1458 | */ | |
1459 | static int omap2_mcspi_resume(struct device *dev) | |
1460 | { | |
1461 | struct spi_master *master = dev_get_drvdata(dev); | |
1462 | struct omap2_mcspi *mcspi = spi_master_get_devdata(master); | |
1463 | struct omap2_mcspi_regs *ctx = &mcspi->ctx; | |
1464 | struct omap2_mcspi_cs *cs; | |
1465 | ||
1466 | pm_runtime_get_sync(mcspi->dev); | |
1467 | list_for_each_entry(cs, &ctx->cs, node) { | |
1468 | if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE) == 0) { | |
1469 | /* | |
1470 | * We need to toggle CS state for OMAP take this | |
1471 | * change in account. | |
1472 | */ | |
1473 | cs->chconf0 |= OMAP2_MCSPI_CHCONF_FORCE; | |
1474 | writel_relaxed(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); | |
1475 | cs->chconf0 &= ~OMAP2_MCSPI_CHCONF_FORCE; | |
1476 | writel_relaxed(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); | |
1477 | } | |
1478 | } | |
1479 | pm_runtime_mark_last_busy(mcspi->dev); | |
1480 | pm_runtime_put_autosuspend(mcspi->dev); | |
1481 | ||
1482 | return pinctrl_pm_select_default_state(dev); | |
1483 | } | |
1484 | ||
1485 | static int omap2_mcspi_suspend(struct device *dev) | |
1486 | { | |
1487 | return pinctrl_pm_select_sleep_state(dev); | |
1488 | } | |
1489 | ||
1490 | #else | |
1491 | #define omap2_mcspi_suspend NULL | |
1492 | #define omap2_mcspi_resume NULL | |
1493 | #endif | |
1494 | ||
1495 | static const struct dev_pm_ops omap2_mcspi_pm_ops = { | |
1496 | .resume = omap2_mcspi_resume, | |
1497 | .suspend = omap2_mcspi_suspend, | |
1498 | .runtime_resume = omap_mcspi_runtime_resume, | |
1499 | }; | |
1500 | ||
1501 | static struct platform_driver omap2_mcspi_driver = { | |
1502 | .driver = { | |
1503 | .name = "omap2_mcspi", | |
1504 | .pm = &omap2_mcspi_pm_ops, | |
1505 | .of_match_table = omap_mcspi_of_match, | |
1506 | }, | |
1507 | .probe = omap2_mcspi_probe, | |
1508 | .remove = omap2_mcspi_remove, | |
1509 | }; | |
1510 | ||
1511 | module_platform_driver(omap2_mcspi_driver); | |
1512 | MODULE_LICENSE("GPL"); |