]>
Commit | Line | Data |
---|---|---|
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 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/device.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/dma-mapping.h> | |
31 | #include <linux/dmaengine.h> | |
32 | #include <linux/omap-dma.h> | |
33 | #include <linux/platform_device.h> | |
34 | #include <linux/err.h> | |
35 | #include <linux/clk.h> | |
36 | #include <linux/io.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/pm_runtime.h> | |
39 | #include <linux/of.h> | |
40 | #include <linux/of_device.h> | |
41 | #include <linux/pinctrl/consumer.h> | |
42 | ||
43 | #include <linux/spi/spi.h> | |
44 | ||
45 | #include <linux/platform_data/spi-omap2-mcspi.h> | |
46 | ||
47 | #define OMAP2_MCSPI_MAX_FREQ 48000000 | |
48 | #define SPI_AUTOSUSPEND_TIMEOUT 2000 | |
49 | ||
50 | #define OMAP2_MCSPI_REVISION 0x00 | |
51 | #define OMAP2_MCSPI_SYSSTATUS 0x14 | |
52 | #define OMAP2_MCSPI_IRQSTATUS 0x18 | |
53 | #define OMAP2_MCSPI_IRQENABLE 0x1c | |
54 | #define OMAP2_MCSPI_WAKEUPENABLE 0x20 | |
55 | #define OMAP2_MCSPI_SYST 0x24 | |
56 | #define OMAP2_MCSPI_MODULCTRL 0x28 | |
57 | ||
58 | /* per-channel banks, 0x14 bytes each, first is: */ | |
59 | #define OMAP2_MCSPI_CHCONF0 0x2c | |
60 | #define OMAP2_MCSPI_CHSTAT0 0x30 | |
61 | #define OMAP2_MCSPI_CHCTRL0 0x34 | |
62 | #define OMAP2_MCSPI_TX0 0x38 | |
63 | #define OMAP2_MCSPI_RX0 0x3c | |
64 | ||
65 | /* per-register bitmasks: */ | |
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 | ||
87 | #define OMAP2_MCSPI_CHSTAT_RXS BIT(0) | |
88 | #define OMAP2_MCSPI_CHSTAT_TXS BIT(1) | |
89 | #define OMAP2_MCSPI_CHSTAT_EOT BIT(2) | |
90 | ||
91 | #define OMAP2_MCSPI_CHCTRL_EN BIT(0) | |
92 | ||
93 | #define OMAP2_MCSPI_WAKEUPENABLE_WKEN BIT(0) | |
94 | ||
95 | /* We have 2 DMA channels per CS, one for RX and one for TX */ | |
96 | struct omap2_mcspi_dma { | |
97 | struct dma_chan *dma_tx; | |
98 | struct dma_chan *dma_rx; | |
99 | ||
100 | int dma_tx_sync_dev; | |
101 | int dma_rx_sync_dev; | |
102 | ||
103 | struct completion dma_tx_completion; | |
104 | struct completion dma_rx_completion; | |
105 | }; | |
106 | ||
107 | /* use PIO for small transfers, avoiding DMA setup/teardown overhead and | |
108 | * cache operations; better heuristics consider wordsize and bitrate. | |
109 | */ | |
110 | #define DMA_MIN_BYTES 160 | |
111 | ||
112 | ||
113 | /* | |
114 | * Used for context save and restore, structure members to be updated whenever | |
115 | * corresponding registers are modified. | |
116 | */ | |
117 | struct omap2_mcspi_regs { | |
118 | u32 modulctrl; | |
119 | u32 wakeupenable; | |
120 | struct list_head cs; | |
121 | }; | |
122 | ||
123 | struct omap2_mcspi { | |
124 | struct spi_master *master; | |
125 | /* Virtual base address of the controller */ | |
126 | void __iomem *base; | |
127 | unsigned long phys; | |
128 | /* SPI1 has 4 channels, while SPI2 has 2 */ | |
129 | struct omap2_mcspi_dma *dma_channels; | |
130 | struct device *dev; | |
131 | struct omap2_mcspi_regs ctx; | |
132 | unsigned int pin_dir:1; | |
133 | }; | |
134 | ||
135 | struct omap2_mcspi_cs { | |
136 | void __iomem *base; | |
137 | unsigned long phys; | |
138 | int word_len; | |
139 | struct list_head node; | |
140 | /* Context save and restore shadow register */ | |
141 | u32 chconf0; | |
142 | }; | |
143 | ||
144 | static inline void mcspi_write_reg(struct spi_master *master, | |
145 | int idx, u32 val) | |
146 | { | |
147 | struct omap2_mcspi *mcspi = spi_master_get_devdata(master); | |
148 | ||
149 | __raw_writel(val, mcspi->base + idx); | |
150 | } | |
151 | ||
152 | static inline u32 mcspi_read_reg(struct spi_master *master, int idx) | |
153 | { | |
154 | struct omap2_mcspi *mcspi = spi_master_get_devdata(master); | |
155 | ||
156 | return __raw_readl(mcspi->base + idx); | |
157 | } | |
158 | ||
159 | static inline void mcspi_write_cs_reg(const struct spi_device *spi, | |
160 | int idx, u32 val) | |
161 | { | |
162 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
163 | ||
164 | __raw_writel(val, cs->base + idx); | |
165 | } | |
166 | ||
167 | static inline u32 mcspi_read_cs_reg(const struct spi_device *spi, int idx) | |
168 | { | |
169 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
170 | ||
171 | return __raw_readl(cs->base + idx); | |
172 | } | |
173 | ||
174 | static inline u32 mcspi_cached_chconf0(const struct spi_device *spi) | |
175 | { | |
176 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
177 | ||
178 | return cs->chconf0; | |
179 | } | |
180 | ||
181 | static inline void mcspi_write_chconf0(const struct spi_device *spi, u32 val) | |
182 | { | |
183 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
184 | ||
185 | cs->chconf0 = val; | |
186 | mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, val); | |
187 | mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0); | |
188 | } | |
189 | ||
190 | static void omap2_mcspi_set_dma_req(const struct spi_device *spi, | |
191 | int is_read, int enable) | |
192 | { | |
193 | u32 l, rw; | |
194 | ||
195 | l = mcspi_cached_chconf0(spi); | |
196 | ||
197 | if (is_read) /* 1 is read, 0 write */ | |
198 | rw = OMAP2_MCSPI_CHCONF_DMAR; | |
199 | else | |
200 | rw = OMAP2_MCSPI_CHCONF_DMAW; | |
201 | ||
202 | if (enable) | |
203 | l |= rw; | |
204 | else | |
205 | l &= ~rw; | |
206 | ||
207 | mcspi_write_chconf0(spi, l); | |
208 | } | |
209 | ||
210 | static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable) | |
211 | { | |
212 | u32 l; | |
213 | ||
214 | l = enable ? OMAP2_MCSPI_CHCTRL_EN : 0; | |
215 | mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, l); | |
216 | /* Flash post-writes */ | |
217 | mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0); | |
218 | } | |
219 | ||
220 | static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active) | |
221 | { | |
222 | u32 l; | |
223 | ||
224 | l = mcspi_cached_chconf0(spi); | |
225 | if (cs_active) | |
226 | l |= OMAP2_MCSPI_CHCONF_FORCE; | |
227 | else | |
228 | l &= ~OMAP2_MCSPI_CHCONF_FORCE; | |
229 | ||
230 | mcspi_write_chconf0(spi, l); | |
231 | } | |
232 | ||
233 | static void omap2_mcspi_set_master_mode(struct spi_master *master) | |
234 | { | |
235 | struct omap2_mcspi *mcspi = spi_master_get_devdata(master); | |
236 | struct omap2_mcspi_regs *ctx = &mcspi->ctx; | |
237 | u32 l; | |
238 | ||
239 | /* | |
240 | * Setup when switching from (reset default) slave mode | |
241 | * to single-channel master mode | |
242 | */ | |
243 | l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL); | |
244 | l &= ~(OMAP2_MCSPI_MODULCTRL_STEST | OMAP2_MCSPI_MODULCTRL_MS); | |
245 | l |= OMAP2_MCSPI_MODULCTRL_SINGLE; | |
246 | mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l); | |
247 | ||
248 | ctx->modulctrl = l; | |
249 | } | |
250 | ||
251 | static void omap2_mcspi_restore_ctx(struct omap2_mcspi *mcspi) | |
252 | { | |
253 | struct spi_master *spi_cntrl = mcspi->master; | |
254 | struct omap2_mcspi_regs *ctx = &mcspi->ctx; | |
255 | struct omap2_mcspi_cs *cs; | |
256 | ||
257 | /* McSPI: context restore */ | |
258 | mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_MODULCTRL, ctx->modulctrl); | |
259 | mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_WAKEUPENABLE, ctx->wakeupenable); | |
260 | ||
261 | list_for_each_entry(cs, &ctx->cs, node) | |
262 | __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); | |
263 | } | |
264 | ||
265 | static int omap2_prepare_transfer(struct spi_master *master) | |
266 | { | |
267 | struct omap2_mcspi *mcspi = spi_master_get_devdata(master); | |
268 | ||
269 | pm_runtime_get_sync(mcspi->dev); | |
270 | return 0; | |
271 | } | |
272 | ||
273 | static int omap2_unprepare_transfer(struct spi_master *master) | |
274 | { | |
275 | struct omap2_mcspi *mcspi = spi_master_get_devdata(master); | |
276 | ||
277 | pm_runtime_mark_last_busy(mcspi->dev); | |
278 | pm_runtime_put_autosuspend(mcspi->dev); | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit) | |
283 | { | |
284 | unsigned long timeout; | |
285 | ||
286 | timeout = jiffies + msecs_to_jiffies(1000); | |
287 | while (!(__raw_readl(reg) & bit)) { | |
288 | if (time_after(jiffies, timeout)) | |
289 | return -1; | |
290 | cpu_relax(); | |
291 | } | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static void omap2_mcspi_rx_callback(void *data) | |
296 | { | |
297 | struct spi_device *spi = data; | |
298 | struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); | |
299 | struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
300 | ||
301 | complete(&mcspi_dma->dma_rx_completion); | |
302 | ||
303 | /* We must disable the DMA RX request */ | |
304 | omap2_mcspi_set_dma_req(spi, 1, 0); | |
305 | } | |
306 | ||
307 | static void omap2_mcspi_tx_callback(void *data) | |
308 | { | |
309 | struct spi_device *spi = data; | |
310 | struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); | |
311 | struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
312 | ||
313 | complete(&mcspi_dma->dma_tx_completion); | |
314 | ||
315 | /* We must disable the DMA TX request */ | |
316 | omap2_mcspi_set_dma_req(spi, 0, 0); | |
317 | } | |
318 | ||
319 | static void omap2_mcspi_tx_dma(struct spi_device *spi, | |
320 | struct spi_transfer *xfer, | |
321 | struct dma_slave_config cfg) | |
322 | { | |
323 | struct omap2_mcspi *mcspi; | |
324 | struct omap2_mcspi_dma *mcspi_dma; | |
325 | unsigned int count; | |
326 | ||
327 | mcspi = spi_master_get_devdata(spi->master); | |
328 | mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
329 | count = xfer->len; | |
330 | ||
331 | if (mcspi_dma->dma_tx) { | |
332 | struct dma_async_tx_descriptor *tx; | |
333 | struct scatterlist sg; | |
334 | ||
335 | dmaengine_slave_config(mcspi_dma->dma_tx, &cfg); | |
336 | ||
337 | sg_init_table(&sg, 1); | |
338 | sg_dma_address(&sg) = xfer->tx_dma; | |
339 | sg_dma_len(&sg) = xfer->len; | |
340 | ||
341 | tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, &sg, 1, | |
342 | DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
343 | if (tx) { | |
344 | tx->callback = omap2_mcspi_tx_callback; | |
345 | tx->callback_param = spi; | |
346 | dmaengine_submit(tx); | |
347 | } else { | |
348 | /* FIXME: fall back to PIO? */ | |
349 | } | |
350 | } | |
351 | dma_async_issue_pending(mcspi_dma->dma_tx); | |
352 | omap2_mcspi_set_dma_req(spi, 0, 1); | |
353 | ||
354 | } | |
355 | ||
356 | static unsigned | |
357 | omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer, | |
358 | struct dma_slave_config cfg, | |
359 | unsigned es) | |
360 | { | |
361 | struct omap2_mcspi *mcspi; | |
362 | struct omap2_mcspi_dma *mcspi_dma; | |
363 | unsigned int count; | |
364 | u32 l; | |
365 | int elements = 0; | |
366 | int word_len, element_count; | |
367 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
368 | mcspi = spi_master_get_devdata(spi->master); | |
369 | mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
370 | count = xfer->len; | |
371 | word_len = cs->word_len; | |
372 | l = mcspi_cached_chconf0(spi); | |
373 | ||
374 | if (word_len <= 8) | |
375 | element_count = count; | |
376 | else if (word_len <= 16) | |
377 | element_count = count >> 1; | |
378 | else /* word_len <= 32 */ | |
379 | element_count = count >> 2; | |
380 | ||
381 | if (mcspi_dma->dma_rx) { | |
382 | struct dma_async_tx_descriptor *tx; | |
383 | struct scatterlist sg; | |
384 | size_t len = xfer->len - es; | |
385 | ||
386 | dmaengine_slave_config(mcspi_dma->dma_rx, &cfg); | |
387 | ||
388 | if (l & OMAP2_MCSPI_CHCONF_TURBO) | |
389 | len -= es; | |
390 | ||
391 | sg_init_table(&sg, 1); | |
392 | sg_dma_address(&sg) = xfer->rx_dma; | |
393 | sg_dma_len(&sg) = len; | |
394 | ||
395 | tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, &sg, 1, | |
396 | DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | | |
397 | DMA_CTRL_ACK); | |
398 | if (tx) { | |
399 | tx->callback = omap2_mcspi_rx_callback; | |
400 | tx->callback_param = spi; | |
401 | dmaengine_submit(tx); | |
402 | } else { | |
403 | /* FIXME: fall back to PIO? */ | |
404 | } | |
405 | } | |
406 | ||
407 | dma_async_issue_pending(mcspi_dma->dma_rx); | |
408 | omap2_mcspi_set_dma_req(spi, 1, 1); | |
409 | ||
410 | wait_for_completion(&mcspi_dma->dma_rx_completion); | |
411 | dma_unmap_single(mcspi->dev, xfer->rx_dma, count, | |
412 | DMA_FROM_DEVICE); | |
413 | omap2_mcspi_set_enable(spi, 0); | |
414 | ||
415 | elements = element_count - 1; | |
416 | ||
417 | if (l & OMAP2_MCSPI_CHCONF_TURBO) { | |
418 | elements--; | |
419 | ||
420 | if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0) | |
421 | & OMAP2_MCSPI_CHSTAT_RXS)) { | |
422 | u32 w; | |
423 | ||
424 | w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0); | |
425 | if (word_len <= 8) | |
426 | ((u8 *)xfer->rx_buf)[elements++] = w; | |
427 | else if (word_len <= 16) | |
428 | ((u16 *)xfer->rx_buf)[elements++] = w; | |
429 | else /* word_len <= 32 */ | |
430 | ((u32 *)xfer->rx_buf)[elements++] = w; | |
431 | } else { | |
432 | dev_err(&spi->dev, "DMA RX penultimate word empty"); | |
433 | count -= (word_len <= 8) ? 2 : | |
434 | (word_len <= 16) ? 4 : | |
435 | /* word_len <= 32 */ 8; | |
436 | omap2_mcspi_set_enable(spi, 1); | |
437 | return count; | |
438 | } | |
439 | } | |
440 | if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0) | |
441 | & OMAP2_MCSPI_CHSTAT_RXS)) { | |
442 | u32 w; | |
443 | ||
444 | w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0); | |
445 | if (word_len <= 8) | |
446 | ((u8 *)xfer->rx_buf)[elements] = w; | |
447 | else if (word_len <= 16) | |
448 | ((u16 *)xfer->rx_buf)[elements] = w; | |
449 | else /* word_len <= 32 */ | |
450 | ((u32 *)xfer->rx_buf)[elements] = w; | |
451 | } else { | |
452 | dev_err(&spi->dev, "DMA RX last word empty"); | |
453 | count -= (word_len <= 8) ? 1 : | |
454 | (word_len <= 16) ? 2 : | |
455 | /* word_len <= 32 */ 4; | |
456 | } | |
457 | omap2_mcspi_set_enable(spi, 1); | |
458 | return count; | |
459 | } | |
460 | ||
461 | static unsigned | |
462 | omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer) | |
463 | { | |
464 | struct omap2_mcspi *mcspi; | |
465 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
466 | struct omap2_mcspi_dma *mcspi_dma; | |
467 | unsigned int count; | |
468 | u32 l; | |
469 | u8 *rx; | |
470 | const u8 *tx; | |
471 | struct dma_slave_config cfg; | |
472 | enum dma_slave_buswidth width; | |
473 | unsigned es; | |
474 | void __iomem *chstat_reg; | |
475 | ||
476 | mcspi = spi_master_get_devdata(spi->master); | |
477 | mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
478 | l = mcspi_cached_chconf0(spi); | |
479 | ||
480 | ||
481 | if (cs->word_len <= 8) { | |
482 | width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
483 | es = 1; | |
484 | } else if (cs->word_len <= 16) { | |
485 | width = DMA_SLAVE_BUSWIDTH_2_BYTES; | |
486 | es = 2; | |
487 | } else { | |
488 | width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
489 | es = 4; | |
490 | } | |
491 | ||
492 | memset(&cfg, 0, sizeof(cfg)); | |
493 | cfg.src_addr = cs->phys + OMAP2_MCSPI_RX0; | |
494 | cfg.dst_addr = cs->phys + OMAP2_MCSPI_TX0; | |
495 | cfg.src_addr_width = width; | |
496 | cfg.dst_addr_width = width; | |
497 | cfg.src_maxburst = 1; | |
498 | cfg.dst_maxburst = 1; | |
499 | ||
500 | rx = xfer->rx_buf; | |
501 | tx = xfer->tx_buf; | |
502 | ||
503 | count = xfer->len; | |
504 | ||
505 | if (tx != NULL) | |
506 | omap2_mcspi_tx_dma(spi, xfer, cfg); | |
507 | ||
508 | if (rx != NULL) | |
509 | count = omap2_mcspi_rx_dma(spi, xfer, cfg, es); | |
510 | ||
511 | if (tx != NULL) { | |
512 | chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0; | |
513 | wait_for_completion(&mcspi_dma->dma_tx_completion); | |
514 | dma_unmap_single(mcspi->dev, xfer->tx_dma, xfer->len, | |
515 | DMA_TO_DEVICE); | |
516 | ||
517 | /* for TX_ONLY mode, be sure all words have shifted out */ | |
518 | if (rx == NULL) { | |
519 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
520 | OMAP2_MCSPI_CHSTAT_TXS) < 0) | |
521 | dev_err(&spi->dev, "TXS timed out\n"); | |
522 | else if (mcspi_wait_for_reg_bit(chstat_reg, | |
523 | OMAP2_MCSPI_CHSTAT_EOT) < 0) | |
524 | dev_err(&spi->dev, "EOT timed out\n"); | |
525 | } | |
526 | } | |
527 | return count; | |
528 | } | |
529 | ||
530 | static unsigned | |
531 | omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) | |
532 | { | |
533 | struct omap2_mcspi *mcspi; | |
534 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
535 | unsigned int count, c; | |
536 | u32 l; | |
537 | void __iomem *base = cs->base; | |
538 | void __iomem *tx_reg; | |
539 | void __iomem *rx_reg; | |
540 | void __iomem *chstat_reg; | |
541 | int word_len; | |
542 | ||
543 | mcspi = spi_master_get_devdata(spi->master); | |
544 | count = xfer->len; | |
545 | c = count; | |
546 | word_len = cs->word_len; | |
547 | ||
548 | l = mcspi_cached_chconf0(spi); | |
549 | ||
550 | /* We store the pre-calculated register addresses on stack to speed | |
551 | * up the transfer loop. */ | |
552 | tx_reg = base + OMAP2_MCSPI_TX0; | |
553 | rx_reg = base + OMAP2_MCSPI_RX0; | |
554 | chstat_reg = base + OMAP2_MCSPI_CHSTAT0; | |
555 | ||
556 | if (c < (word_len>>3)) | |
557 | return 0; | |
558 | ||
559 | if (word_len <= 8) { | |
560 | u8 *rx; | |
561 | const u8 *tx; | |
562 | ||
563 | rx = xfer->rx_buf; | |
564 | tx = xfer->tx_buf; | |
565 | ||
566 | do { | |
567 | c -= 1; | |
568 | if (tx != NULL) { | |
569 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
570 | OMAP2_MCSPI_CHSTAT_TXS) < 0) { | |
571 | dev_err(&spi->dev, "TXS timed out\n"); | |
572 | goto out; | |
573 | } | |
574 | dev_vdbg(&spi->dev, "write-%d %02x\n", | |
575 | word_len, *tx); | |
576 | __raw_writel(*tx++, tx_reg); | |
577 | } | |
578 | if (rx != NULL) { | |
579 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
580 | OMAP2_MCSPI_CHSTAT_RXS) < 0) { | |
581 | dev_err(&spi->dev, "RXS timed out\n"); | |
582 | goto out; | |
583 | } | |
584 | ||
585 | if (c == 1 && tx == NULL && | |
586 | (l & OMAP2_MCSPI_CHCONF_TURBO)) { | |
587 | omap2_mcspi_set_enable(spi, 0); | |
588 | *rx++ = __raw_readl(rx_reg); | |
589 | dev_vdbg(&spi->dev, "read-%d %02x\n", | |
590 | word_len, *(rx - 1)); | |
591 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
592 | OMAP2_MCSPI_CHSTAT_RXS) < 0) { | |
593 | dev_err(&spi->dev, | |
594 | "RXS timed out\n"); | |
595 | goto out; | |
596 | } | |
597 | c = 0; | |
598 | } else if (c == 0 && tx == NULL) { | |
599 | omap2_mcspi_set_enable(spi, 0); | |
600 | } | |
601 | ||
602 | *rx++ = __raw_readl(rx_reg); | |
603 | dev_vdbg(&spi->dev, "read-%d %02x\n", | |
604 | word_len, *(rx - 1)); | |
605 | } | |
606 | } while (c); | |
607 | } else if (word_len <= 16) { | |
608 | u16 *rx; | |
609 | const u16 *tx; | |
610 | ||
611 | rx = xfer->rx_buf; | |
612 | tx = xfer->tx_buf; | |
613 | do { | |
614 | c -= 2; | |
615 | if (tx != NULL) { | |
616 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
617 | OMAP2_MCSPI_CHSTAT_TXS) < 0) { | |
618 | dev_err(&spi->dev, "TXS timed out\n"); | |
619 | goto out; | |
620 | } | |
621 | dev_vdbg(&spi->dev, "write-%d %04x\n", | |
622 | word_len, *tx); | |
623 | __raw_writel(*tx++, tx_reg); | |
624 | } | |
625 | if (rx != NULL) { | |
626 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
627 | OMAP2_MCSPI_CHSTAT_RXS) < 0) { | |
628 | dev_err(&spi->dev, "RXS timed out\n"); | |
629 | goto out; | |
630 | } | |
631 | ||
632 | if (c == 2 && tx == NULL && | |
633 | (l & OMAP2_MCSPI_CHCONF_TURBO)) { | |
634 | omap2_mcspi_set_enable(spi, 0); | |
635 | *rx++ = __raw_readl(rx_reg); | |
636 | dev_vdbg(&spi->dev, "read-%d %04x\n", | |
637 | word_len, *(rx - 1)); | |
638 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
639 | OMAP2_MCSPI_CHSTAT_RXS) < 0) { | |
640 | dev_err(&spi->dev, | |
641 | "RXS timed out\n"); | |
642 | goto out; | |
643 | } | |
644 | c = 0; | |
645 | } else if (c == 0 && tx == NULL) { | |
646 | omap2_mcspi_set_enable(spi, 0); | |
647 | } | |
648 | ||
649 | *rx++ = __raw_readl(rx_reg); | |
650 | dev_vdbg(&spi->dev, "read-%d %04x\n", | |
651 | word_len, *(rx - 1)); | |
652 | } | |
653 | } while (c >= 2); | |
654 | } else if (word_len <= 32) { | |
655 | u32 *rx; | |
656 | const u32 *tx; | |
657 | ||
658 | rx = xfer->rx_buf; | |
659 | tx = xfer->tx_buf; | |
660 | do { | |
661 | c -= 4; | |
662 | if (tx != NULL) { | |
663 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
664 | OMAP2_MCSPI_CHSTAT_TXS) < 0) { | |
665 | dev_err(&spi->dev, "TXS timed out\n"); | |
666 | goto out; | |
667 | } | |
668 | dev_vdbg(&spi->dev, "write-%d %08x\n", | |
669 | word_len, *tx); | |
670 | __raw_writel(*tx++, tx_reg); | |
671 | } | |
672 | if (rx != NULL) { | |
673 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
674 | OMAP2_MCSPI_CHSTAT_RXS) < 0) { | |
675 | dev_err(&spi->dev, "RXS timed out\n"); | |
676 | goto out; | |
677 | } | |
678 | ||
679 | if (c == 4 && tx == NULL && | |
680 | (l & OMAP2_MCSPI_CHCONF_TURBO)) { | |
681 | omap2_mcspi_set_enable(spi, 0); | |
682 | *rx++ = __raw_readl(rx_reg); | |
683 | dev_vdbg(&spi->dev, "read-%d %08x\n", | |
684 | word_len, *(rx - 1)); | |
685 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
686 | OMAP2_MCSPI_CHSTAT_RXS) < 0) { | |
687 | dev_err(&spi->dev, | |
688 | "RXS timed out\n"); | |
689 | goto out; | |
690 | } | |
691 | c = 0; | |
692 | } else if (c == 0 && tx == NULL) { | |
693 | omap2_mcspi_set_enable(spi, 0); | |
694 | } | |
695 | ||
696 | *rx++ = __raw_readl(rx_reg); | |
697 | dev_vdbg(&spi->dev, "read-%d %08x\n", | |
698 | word_len, *(rx - 1)); | |
699 | } | |
700 | } while (c >= 4); | |
701 | } | |
702 | ||
703 | /* for TX_ONLY mode, be sure all words have shifted out */ | |
704 | if (xfer->rx_buf == NULL) { | |
705 | if (mcspi_wait_for_reg_bit(chstat_reg, | |
706 | OMAP2_MCSPI_CHSTAT_TXS) < 0) { | |
707 | dev_err(&spi->dev, "TXS timed out\n"); | |
708 | } else if (mcspi_wait_for_reg_bit(chstat_reg, | |
709 | OMAP2_MCSPI_CHSTAT_EOT) < 0) | |
710 | dev_err(&spi->dev, "EOT timed out\n"); | |
711 | ||
712 | /* disable chan to purge rx datas received in TX_ONLY transfer, | |
713 | * otherwise these rx datas will affect the direct following | |
714 | * RX_ONLY transfer. | |
715 | */ | |
716 | omap2_mcspi_set_enable(spi, 0); | |
717 | } | |
718 | out: | |
719 | omap2_mcspi_set_enable(spi, 1); | |
720 | return count - c; | |
721 | } | |
722 | ||
723 | static u32 omap2_mcspi_calc_divisor(u32 speed_hz) | |
724 | { | |
725 | u32 div; | |
726 | ||
727 | for (div = 0; div < 15; div++) | |
728 | if (speed_hz >= (OMAP2_MCSPI_MAX_FREQ >> div)) | |
729 | return div; | |
730 | ||
731 | return 15; | |
732 | } | |
733 | ||
734 | /* called only when no transfer is active to this device */ | |
735 | static int omap2_mcspi_setup_transfer(struct spi_device *spi, | |
736 | struct spi_transfer *t) | |
737 | { | |
738 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
739 | struct omap2_mcspi *mcspi; | |
740 | struct spi_master *spi_cntrl; | |
741 | u32 l = 0, div = 0; | |
742 | u8 word_len = spi->bits_per_word; | |
743 | u32 speed_hz = spi->max_speed_hz; | |
744 | ||
745 | mcspi = spi_master_get_devdata(spi->master); | |
746 | spi_cntrl = mcspi->master; | |
747 | ||
748 | if (t != NULL && t->bits_per_word) | |
749 | word_len = t->bits_per_word; | |
750 | ||
751 | cs->word_len = word_len; | |
752 | ||
753 | if (t && t->speed_hz) | |
754 | speed_hz = t->speed_hz; | |
755 | ||
756 | speed_hz = min_t(u32, speed_hz, OMAP2_MCSPI_MAX_FREQ); | |
757 | div = omap2_mcspi_calc_divisor(speed_hz); | |
758 | ||
759 | l = mcspi_cached_chconf0(spi); | |
760 | ||
761 | /* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS | |
762 | * REVISIT: this controller could support SPI_3WIRE mode. | |
763 | */ | |
764 | if (mcspi->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) { | |
765 | l &= ~OMAP2_MCSPI_CHCONF_IS; | |
766 | l &= ~OMAP2_MCSPI_CHCONF_DPE1; | |
767 | l |= OMAP2_MCSPI_CHCONF_DPE0; | |
768 | } else { | |
769 | l |= OMAP2_MCSPI_CHCONF_IS; | |
770 | l |= OMAP2_MCSPI_CHCONF_DPE1; | |
771 | l &= ~OMAP2_MCSPI_CHCONF_DPE0; | |
772 | } | |
773 | ||
774 | /* wordlength */ | |
775 | l &= ~OMAP2_MCSPI_CHCONF_WL_MASK; | |
776 | l |= (word_len - 1) << 7; | |
777 | ||
778 | /* set chipselect polarity; manage with FORCE */ | |
779 | if (!(spi->mode & SPI_CS_HIGH)) | |
780 | l |= OMAP2_MCSPI_CHCONF_EPOL; /* active-low; normal */ | |
781 | else | |
782 | l &= ~OMAP2_MCSPI_CHCONF_EPOL; | |
783 | ||
784 | /* set clock divisor */ | |
785 | l &= ~OMAP2_MCSPI_CHCONF_CLKD_MASK; | |
786 | l |= div << 2; | |
787 | ||
788 | /* set SPI mode 0..3 */ | |
789 | if (spi->mode & SPI_CPOL) | |
790 | l |= OMAP2_MCSPI_CHCONF_POL; | |
791 | else | |
792 | l &= ~OMAP2_MCSPI_CHCONF_POL; | |
793 | if (spi->mode & SPI_CPHA) | |
794 | l |= OMAP2_MCSPI_CHCONF_PHA; | |
795 | else | |
796 | l &= ~OMAP2_MCSPI_CHCONF_PHA; | |
797 | ||
798 | mcspi_write_chconf0(spi, l); | |
799 | ||
800 | dev_dbg(&spi->dev, "setup: speed %d, sample %s edge, clk %s\n", | |
801 | OMAP2_MCSPI_MAX_FREQ >> div, | |
802 | (spi->mode & SPI_CPHA) ? "trailing" : "leading", | |
803 | (spi->mode & SPI_CPOL) ? "inverted" : "normal"); | |
804 | ||
805 | return 0; | |
806 | } | |
807 | ||
808 | static int omap2_mcspi_request_dma(struct spi_device *spi) | |
809 | { | |
810 | struct spi_master *master = spi->master; | |
811 | struct omap2_mcspi *mcspi; | |
812 | struct omap2_mcspi_dma *mcspi_dma; | |
813 | dma_cap_mask_t mask; | |
814 | unsigned sig; | |
815 | ||
816 | mcspi = spi_master_get_devdata(master); | |
817 | mcspi_dma = mcspi->dma_channels + spi->chip_select; | |
818 | ||
819 | init_completion(&mcspi_dma->dma_rx_completion); | |
820 | init_completion(&mcspi_dma->dma_tx_completion); | |
821 | ||
822 | dma_cap_zero(mask); | |
823 | dma_cap_set(DMA_SLAVE, mask); | |
824 | sig = mcspi_dma->dma_rx_sync_dev; | |
825 | mcspi_dma->dma_rx = dma_request_channel(mask, omap_dma_filter_fn, &sig); | |
826 | if (!mcspi_dma->dma_rx) { | |
827 | dev_err(&spi->dev, "no RX DMA engine channel for McSPI\n"); | |
828 | return -EAGAIN; | |
829 | } | |
830 | ||
831 | sig = mcspi_dma->dma_tx_sync_dev; | |
832 | mcspi_dma->dma_tx = dma_request_channel(mask, omap_dma_filter_fn, &sig); | |
833 | if (!mcspi_dma->dma_tx) { | |
834 | dev_err(&spi->dev, "no TX DMA engine channel for McSPI\n"); | |
835 | dma_release_channel(mcspi_dma->dma_rx); | |
836 | mcspi_dma->dma_rx = NULL; | |
837 | return -EAGAIN; | |
838 | } | |
839 | ||
840 | return 0; | |
841 | } | |
842 | ||
843 | static int omap2_mcspi_setup(struct spi_device *spi) | |
844 | { | |
845 | int ret; | |
846 | struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); | |
847 | struct omap2_mcspi_regs *ctx = &mcspi->ctx; | |
848 | struct omap2_mcspi_dma *mcspi_dma; | |
849 | struct omap2_mcspi_cs *cs = spi->controller_state; | |
850 | ||
851 | if (spi->bits_per_word < 4 || spi->bits_per_word > 32) { | |
852 | dev_dbg(&spi->dev, "setup: unsupported %d bit words\n", | |
853 | spi->bits_per_word); | |
854 | return -EINVAL; | |
855 | } | |
856 | ||
857 | mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
858 | ||
859 | if (!cs) { | |
860 | cs = kzalloc(sizeof *cs, GFP_KERNEL); | |
861 | if (!cs) | |
862 | return -ENOMEM; | |
863 | cs->base = mcspi->base + spi->chip_select * 0x14; | |
864 | cs->phys = mcspi->phys + spi->chip_select * 0x14; | |
865 | cs->chconf0 = 0; | |
866 | spi->controller_state = cs; | |
867 | /* Link this to context save list */ | |
868 | list_add_tail(&cs->node, &ctx->cs); | |
869 | } | |
870 | ||
871 | if (!mcspi_dma->dma_rx || !mcspi_dma->dma_tx) { | |
872 | ret = omap2_mcspi_request_dma(spi); | |
873 | if (ret < 0) | |
874 | return ret; | |
875 | } | |
876 | ||
877 | ret = pm_runtime_get_sync(mcspi->dev); | |
878 | if (ret < 0) | |
879 | return ret; | |
880 | ||
881 | ret = omap2_mcspi_setup_transfer(spi, NULL); | |
882 | pm_runtime_mark_last_busy(mcspi->dev); | |
883 | pm_runtime_put_autosuspend(mcspi->dev); | |
884 | ||
885 | return ret; | |
886 | } | |
887 | ||
888 | static void omap2_mcspi_cleanup(struct spi_device *spi) | |
889 | { | |
890 | struct omap2_mcspi *mcspi; | |
891 | struct omap2_mcspi_dma *mcspi_dma; | |
892 | struct omap2_mcspi_cs *cs; | |
893 | ||
894 | mcspi = spi_master_get_devdata(spi->master); | |
895 | ||
896 | if (spi->controller_state) { | |
897 | /* Unlink controller state from context save list */ | |
898 | cs = spi->controller_state; | |
899 | list_del(&cs->node); | |
900 | ||
901 | kfree(cs); | |
902 | } | |
903 | ||
904 | if (spi->chip_select < spi->master->num_chipselect) { | |
905 | mcspi_dma = &mcspi->dma_channels[spi->chip_select]; | |
906 | ||
907 | if (mcspi_dma->dma_rx) { | |
908 | dma_release_channel(mcspi_dma->dma_rx); | |
909 | mcspi_dma->dma_rx = NULL; | |
910 | } | |
911 | if (mcspi_dma->dma_tx) { | |
912 | dma_release_channel(mcspi_dma->dma_tx); | |
913 | mcspi_dma->dma_tx = NULL; | |
914 | } | |
915 | } | |
916 | } | |
917 | ||
918 | static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m) | |
919 | { | |
920 | ||
921 | /* We only enable one channel at a time -- the one whose message is | |
922 | * -- although this controller would gladly | |
923 | * arbitrate among multiple channels. This corresponds to "single | |
924 | * channel" master mode. As a side effect, we need to manage the | |
925 | * chipselect with the FORCE bit ... CS != channel enable. | |
926 | */ | |
927 | ||
928 | struct spi_device *spi; | |
929 | struct spi_transfer *t = NULL; | |
930 | int cs_active = 0; | |
931 | struct omap2_mcspi_cs *cs; | |
932 | struct omap2_mcspi_device_config *cd; | |
933 | int par_override = 0; | |
934 | int status = 0; | |
935 | u32 chconf; | |
936 | ||
937 | spi = m->spi; | |
938 | cs = spi->controller_state; | |
939 | cd = spi->controller_data; | |
940 | ||
941 | omap2_mcspi_set_enable(spi, 1); | |
942 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
943 | if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) { | |
944 | status = -EINVAL; | |
945 | break; | |
946 | } | |
947 | if (par_override || t->speed_hz || t->bits_per_word) { | |
948 | par_override = 1; | |
949 | status = omap2_mcspi_setup_transfer(spi, t); | |
950 | if (status < 0) | |
951 | break; | |
952 | if (!t->speed_hz && !t->bits_per_word) | |
953 | par_override = 0; | |
954 | } | |
955 | ||
956 | if (!cs_active) { | |
957 | omap2_mcspi_force_cs(spi, 1); | |
958 | cs_active = 1; | |
959 | } | |
960 | ||
961 | chconf = mcspi_cached_chconf0(spi); | |
962 | chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK; | |
963 | chconf &= ~OMAP2_MCSPI_CHCONF_TURBO; | |
964 | ||
965 | if (t->tx_buf == NULL) | |
966 | chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY; | |
967 | else if (t->rx_buf == NULL) | |
968 | chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY; | |
969 | ||
970 | if (cd && cd->turbo_mode && t->tx_buf == NULL) { | |
971 | /* Turbo mode is for more than one word */ | |
972 | if (t->len > ((cs->word_len + 7) >> 3)) | |
973 | chconf |= OMAP2_MCSPI_CHCONF_TURBO; | |
974 | } | |
975 | ||
976 | mcspi_write_chconf0(spi, chconf); | |
977 | ||
978 | if (t->len) { | |
979 | unsigned count; | |
980 | ||
981 | /* RX_ONLY mode needs dummy data in TX reg */ | |
982 | if (t->tx_buf == NULL) | |
983 | __raw_writel(0, cs->base | |
984 | + OMAP2_MCSPI_TX0); | |
985 | ||
986 | if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES) | |
987 | count = omap2_mcspi_txrx_dma(spi, t); | |
988 | else | |
989 | count = omap2_mcspi_txrx_pio(spi, t); | |
990 | m->actual_length += count; | |
991 | ||
992 | if (count != t->len) { | |
993 | status = -EIO; | |
994 | break; | |
995 | } | |
996 | } | |
997 | ||
998 | if (t->delay_usecs) | |
999 | udelay(t->delay_usecs); | |
1000 | ||
1001 | /* ignore the "leave it on after last xfer" hint */ | |
1002 | if (t->cs_change) { | |
1003 | omap2_mcspi_force_cs(spi, 0); | |
1004 | cs_active = 0; | |
1005 | } | |
1006 | } | |
1007 | /* Restore defaults if they were overriden */ | |
1008 | if (par_override) { | |
1009 | par_override = 0; | |
1010 | status = omap2_mcspi_setup_transfer(spi, NULL); | |
1011 | } | |
1012 | ||
1013 | if (cs_active) | |
1014 | omap2_mcspi_force_cs(spi, 0); | |
1015 | ||
1016 | omap2_mcspi_set_enable(spi, 0); | |
1017 | ||
1018 | m->status = status; | |
1019 | ||
1020 | } | |
1021 | ||
1022 | static int omap2_mcspi_transfer_one_message(struct spi_master *master, | |
1023 | struct spi_message *m) | |
1024 | { | |
1025 | struct omap2_mcspi *mcspi; | |
1026 | struct spi_transfer *t; | |
1027 | ||
1028 | mcspi = spi_master_get_devdata(master); | |
1029 | m->actual_length = 0; | |
1030 | m->status = 0; | |
1031 | ||
1032 | /* reject invalid messages and transfers */ | |
1033 | if (list_empty(&m->transfers)) | |
1034 | return -EINVAL; | |
1035 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
1036 | const void *tx_buf = t->tx_buf; | |
1037 | void *rx_buf = t->rx_buf; | |
1038 | unsigned len = t->len; | |
1039 | ||
1040 | if (t->speed_hz > OMAP2_MCSPI_MAX_FREQ | |
1041 | || (len && !(rx_buf || tx_buf)) | |
1042 | || (t->bits_per_word && | |
1043 | ( t->bits_per_word < 4 | |
1044 | || t->bits_per_word > 32))) { | |
1045 | dev_dbg(mcspi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n", | |
1046 | t->speed_hz, | |
1047 | len, | |
1048 | tx_buf ? "tx" : "", | |
1049 | rx_buf ? "rx" : "", | |
1050 | t->bits_per_word); | |
1051 | return -EINVAL; | |
1052 | } | |
1053 | if (t->speed_hz && t->speed_hz < (OMAP2_MCSPI_MAX_FREQ >> 15)) { | |
1054 | dev_dbg(mcspi->dev, "speed_hz %d below minimum %d Hz\n", | |
1055 | t->speed_hz, | |
1056 | OMAP2_MCSPI_MAX_FREQ >> 15); | |
1057 | return -EINVAL; | |
1058 | } | |
1059 | ||
1060 | if (m->is_dma_mapped || len < DMA_MIN_BYTES) | |
1061 | continue; | |
1062 | ||
1063 | if (tx_buf != NULL) { | |
1064 | t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf, | |
1065 | len, DMA_TO_DEVICE); | |
1066 | if (dma_mapping_error(mcspi->dev, t->tx_dma)) { | |
1067 | dev_dbg(mcspi->dev, "dma %cX %d bytes error\n", | |
1068 | 'T', len); | |
1069 | return -EINVAL; | |
1070 | } | |
1071 | } | |
1072 | if (rx_buf != NULL) { | |
1073 | t->rx_dma = dma_map_single(mcspi->dev, rx_buf, t->len, | |
1074 | DMA_FROM_DEVICE); | |
1075 | if (dma_mapping_error(mcspi->dev, t->rx_dma)) { | |
1076 | dev_dbg(mcspi->dev, "dma %cX %d bytes error\n", | |
1077 | 'R', len); | |
1078 | if (tx_buf != NULL) | |
1079 | dma_unmap_single(mcspi->dev, t->tx_dma, | |
1080 | len, DMA_TO_DEVICE); | |
1081 | return -EINVAL; | |
1082 | } | |
1083 | } | |
1084 | } | |
1085 | ||
1086 | omap2_mcspi_work(mcspi, m); | |
1087 | spi_finalize_current_message(master); | |
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | static int __devinit omap2_mcspi_master_setup(struct omap2_mcspi *mcspi) | |
1092 | { | |
1093 | struct spi_master *master = mcspi->master; | |
1094 | struct omap2_mcspi_regs *ctx = &mcspi->ctx; | |
1095 | int ret = 0; | |
1096 | ||
1097 | ret = pm_runtime_get_sync(mcspi->dev); | |
1098 | if (ret < 0) | |
1099 | return ret; | |
1100 | ||
1101 | mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE, | |
1102 | OMAP2_MCSPI_WAKEUPENABLE_WKEN); | |
1103 | ctx->wakeupenable = OMAP2_MCSPI_WAKEUPENABLE_WKEN; | |
1104 | ||
1105 | omap2_mcspi_set_master_mode(master); | |
1106 | pm_runtime_mark_last_busy(mcspi->dev); | |
1107 | pm_runtime_put_autosuspend(mcspi->dev); | |
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | static int omap_mcspi_runtime_resume(struct device *dev) | |
1112 | { | |
1113 | struct omap2_mcspi *mcspi; | |
1114 | struct spi_master *master; | |
1115 | ||
1116 | master = dev_get_drvdata(dev); | |
1117 | mcspi = spi_master_get_devdata(master); | |
1118 | omap2_mcspi_restore_ctx(mcspi); | |
1119 | ||
1120 | return 0; | |
1121 | } | |
1122 | ||
1123 | static struct omap2_mcspi_platform_config omap2_pdata = { | |
1124 | .regs_offset = 0, | |
1125 | }; | |
1126 | ||
1127 | static struct omap2_mcspi_platform_config omap4_pdata = { | |
1128 | .regs_offset = OMAP4_MCSPI_REG_OFFSET, | |
1129 | }; | |
1130 | ||
1131 | static const struct of_device_id omap_mcspi_of_match[] = { | |
1132 | { | |
1133 | .compatible = "ti,omap2-mcspi", | |
1134 | .data = &omap2_pdata, | |
1135 | }, | |
1136 | { | |
1137 | .compatible = "ti,omap4-mcspi", | |
1138 | .data = &omap4_pdata, | |
1139 | }, | |
1140 | { }, | |
1141 | }; | |
1142 | MODULE_DEVICE_TABLE(of, omap_mcspi_of_match); | |
1143 | ||
1144 | static int __devinit omap2_mcspi_probe(struct platform_device *pdev) | |
1145 | { | |
1146 | struct spi_master *master; | |
1147 | const struct omap2_mcspi_platform_config *pdata; | |
1148 | struct omap2_mcspi *mcspi; | |
1149 | struct resource *r; | |
1150 | int status = 0, i; | |
1151 | u32 regs_offset = 0; | |
1152 | static int bus_num = 1; | |
1153 | struct device_node *node = pdev->dev.of_node; | |
1154 | const struct of_device_id *match; | |
1155 | struct pinctrl *pinctrl; | |
1156 | ||
1157 | master = spi_alloc_master(&pdev->dev, sizeof *mcspi); | |
1158 | if (master == NULL) { | |
1159 | dev_dbg(&pdev->dev, "master allocation failed\n"); | |
1160 | return -ENOMEM; | |
1161 | } | |
1162 | ||
1163 | /* the spi->mode bits understood by this driver: */ | |
1164 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; | |
1165 | ||
1166 | master->setup = omap2_mcspi_setup; | |
1167 | master->prepare_transfer_hardware = omap2_prepare_transfer; | |
1168 | master->unprepare_transfer_hardware = omap2_unprepare_transfer; | |
1169 | master->transfer_one_message = omap2_mcspi_transfer_one_message; | |
1170 | master->cleanup = omap2_mcspi_cleanup; | |
1171 | master->dev.of_node = node; | |
1172 | ||
1173 | dev_set_drvdata(&pdev->dev, master); | |
1174 | ||
1175 | mcspi = spi_master_get_devdata(master); | |
1176 | mcspi->master = master; | |
1177 | ||
1178 | match = of_match_device(omap_mcspi_of_match, &pdev->dev); | |
1179 | if (match) { | |
1180 | u32 num_cs = 1; /* default number of chipselect */ | |
1181 | pdata = match->data; | |
1182 | ||
1183 | of_property_read_u32(node, "ti,spi-num-cs", &num_cs); | |
1184 | master->num_chipselect = num_cs; | |
1185 | master->bus_num = bus_num++; | |
1186 | if (of_get_property(node, "ti,pindir-d0-out-d1-in", NULL)) | |
1187 | mcspi->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN; | |
1188 | } else { | |
1189 | pdata = pdev->dev.platform_data; | |
1190 | master->num_chipselect = pdata->num_cs; | |
1191 | if (pdev->id != -1) | |
1192 | master->bus_num = pdev->id; | |
1193 | mcspi->pin_dir = pdata->pin_dir; | |
1194 | } | |
1195 | regs_offset = pdata->regs_offset; | |
1196 | ||
1197 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1198 | if (r == NULL) { | |
1199 | status = -ENODEV; | |
1200 | goto free_master; | |
1201 | } | |
1202 | ||
1203 | r->start += regs_offset; | |
1204 | r->end += regs_offset; | |
1205 | mcspi->phys = r->start; | |
1206 | ||
1207 | mcspi->base = devm_request_and_ioremap(&pdev->dev, r); | |
1208 | if (!mcspi->base) { | |
1209 | dev_dbg(&pdev->dev, "can't ioremap MCSPI\n"); | |
1210 | status = -ENOMEM; | |
1211 | goto free_master; | |
1212 | } | |
1213 | ||
1214 | mcspi->dev = &pdev->dev; | |
1215 | ||
1216 | INIT_LIST_HEAD(&mcspi->ctx.cs); | |
1217 | ||
1218 | mcspi->dma_channels = kcalloc(master->num_chipselect, | |
1219 | sizeof(struct omap2_mcspi_dma), | |
1220 | GFP_KERNEL); | |
1221 | ||
1222 | if (mcspi->dma_channels == NULL) | |
1223 | goto free_master; | |
1224 | ||
1225 | for (i = 0; i < master->num_chipselect; i++) { | |
1226 | char dma_ch_name[14]; | |
1227 | struct resource *dma_res; | |
1228 | ||
1229 | sprintf(dma_ch_name, "rx%d", i); | |
1230 | dma_res = platform_get_resource_byname(pdev, IORESOURCE_DMA, | |
1231 | dma_ch_name); | |
1232 | if (!dma_res) { | |
1233 | dev_dbg(&pdev->dev, "cannot get DMA RX channel\n"); | |
1234 | status = -ENODEV; | |
1235 | break; | |
1236 | } | |
1237 | ||
1238 | mcspi->dma_channels[i].dma_rx_sync_dev = dma_res->start; | |
1239 | sprintf(dma_ch_name, "tx%d", i); | |
1240 | dma_res = platform_get_resource_byname(pdev, IORESOURCE_DMA, | |
1241 | dma_ch_name); | |
1242 | if (!dma_res) { | |
1243 | dev_dbg(&pdev->dev, "cannot get DMA TX channel\n"); | |
1244 | status = -ENODEV; | |
1245 | break; | |
1246 | } | |
1247 | ||
1248 | mcspi->dma_channels[i].dma_tx_sync_dev = dma_res->start; | |
1249 | } | |
1250 | ||
1251 | if (status < 0) | |
1252 | goto dma_chnl_free; | |
1253 | ||
1254 | pinctrl = devm_pinctrl_get_select_default(&pdev->dev); | |
1255 | if (IS_ERR(pinctrl)) | |
1256 | dev_warn(&pdev->dev, | |
1257 | "pins are not configured from the driver\n"); | |
1258 | ||
1259 | pm_runtime_use_autosuspend(&pdev->dev); | |
1260 | pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT); | |
1261 | pm_runtime_enable(&pdev->dev); | |
1262 | ||
1263 | if (status || omap2_mcspi_master_setup(mcspi) < 0) | |
1264 | goto disable_pm; | |
1265 | ||
1266 | status = spi_register_master(master); | |
1267 | if (status < 0) | |
1268 | goto disable_pm; | |
1269 | ||
1270 | return status; | |
1271 | ||
1272 | disable_pm: | |
1273 | pm_runtime_disable(&pdev->dev); | |
1274 | dma_chnl_free: | |
1275 | kfree(mcspi->dma_channels); | |
1276 | free_master: | |
1277 | spi_master_put(master); | |
1278 | return status; | |
1279 | } | |
1280 | ||
1281 | static int __devexit omap2_mcspi_remove(struct platform_device *pdev) | |
1282 | { | |
1283 | struct spi_master *master; | |
1284 | struct omap2_mcspi *mcspi; | |
1285 | struct omap2_mcspi_dma *dma_channels; | |
1286 | ||
1287 | master = dev_get_drvdata(&pdev->dev); | |
1288 | mcspi = spi_master_get_devdata(master); | |
1289 | dma_channels = mcspi->dma_channels; | |
1290 | ||
1291 | pm_runtime_put_sync(mcspi->dev); | |
1292 | pm_runtime_disable(&pdev->dev); | |
1293 | ||
1294 | spi_unregister_master(master); | |
1295 | kfree(dma_channels); | |
1296 | ||
1297 | return 0; | |
1298 | } | |
1299 | ||
1300 | /* work with hotplug and coldplug */ | |
1301 | MODULE_ALIAS("platform:omap2_mcspi"); | |
1302 | ||
1303 | #ifdef CONFIG_SUSPEND | |
1304 | /* | |
1305 | * When SPI wake up from off-mode, CS is in activate state. If it was in | |
1306 | * unactive state when driver was suspend, then force it to unactive state at | |
1307 | * wake up. | |
1308 | */ | |
1309 | static int omap2_mcspi_resume(struct device *dev) | |
1310 | { | |
1311 | struct spi_master *master = dev_get_drvdata(dev); | |
1312 | struct omap2_mcspi *mcspi = spi_master_get_devdata(master); | |
1313 | struct omap2_mcspi_regs *ctx = &mcspi->ctx; | |
1314 | struct omap2_mcspi_cs *cs; | |
1315 | ||
1316 | pm_runtime_get_sync(mcspi->dev); | |
1317 | list_for_each_entry(cs, &ctx->cs, node) { | |
1318 | if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE) == 0) { | |
1319 | /* | |
1320 | * We need to toggle CS state for OMAP take this | |
1321 | * change in account. | |
1322 | */ | |
1323 | cs->chconf0 |= OMAP2_MCSPI_CHCONF_FORCE; | |
1324 | __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); | |
1325 | cs->chconf0 &= ~OMAP2_MCSPI_CHCONF_FORCE; | |
1326 | __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); | |
1327 | } | |
1328 | } | |
1329 | pm_runtime_mark_last_busy(mcspi->dev); | |
1330 | pm_runtime_put_autosuspend(mcspi->dev); | |
1331 | return 0; | |
1332 | } | |
1333 | #else | |
1334 | #define omap2_mcspi_resume NULL | |
1335 | #endif | |
1336 | ||
1337 | static const struct dev_pm_ops omap2_mcspi_pm_ops = { | |
1338 | .resume = omap2_mcspi_resume, | |
1339 | .runtime_resume = omap_mcspi_runtime_resume, | |
1340 | }; | |
1341 | ||
1342 | static struct platform_driver omap2_mcspi_driver = { | |
1343 | .driver = { | |
1344 | .name = "omap2_mcspi", | |
1345 | .owner = THIS_MODULE, | |
1346 | .pm = &omap2_mcspi_pm_ops, | |
1347 | .of_match_table = omap_mcspi_of_match, | |
1348 | }, | |
1349 | .probe = omap2_mcspi_probe, | |
1350 | .remove = __devexit_p(omap2_mcspi_remove), | |
1351 | }; | |
1352 | ||
1353 | module_platform_driver(omap2_mcspi_driver); | |
1354 | MODULE_LICENSE("GPL"); |