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Linux 3.12.70
[linux/fpc-iii.git] / drivers / spi / spi-pxa2xx.c
blobbb4a919d2fdf5be13c55bca921c0b56b555dd436
1 /*
2 * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
3 * Copyright (C) 2013, Intel Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/device.h>
23 #include <linux/ioport.h>
24 #include <linux/errno.h>
25 #include <linux/err.h>
26 #include <linux/interrupt.h>
27 #include <linux/platform_device.h>
28 #include <linux/spi/pxa2xx_spi.h>
29 #include <linux/spi/spi.h>
30 #include <linux/workqueue.h>
31 #include <linux/delay.h>
32 #include <linux/gpio.h>
33 #include <linux/slab.h>
34 #include <linux/clk.h>
35 #include <linux/pm_runtime.h>
36 #include <linux/acpi.h>
37
38 #include <asm/io.h>
39 #include <asm/irq.h>
40 #include <asm/delay.h>
41
42 #include "spi-pxa2xx.h"
43
44 MODULE_AUTHOR("Stephen Street");
45 MODULE_DESCRIPTION("PXA2xx SSP SPI Controller");
46 MODULE_LICENSE("GPL");
47 MODULE_ALIAS("platform:pxa2xx-spi");
48
49 #define MAX_BUSES 3
50
51 #define TIMOUT_DFLT 1000
52
53 /*
54 * for testing SSCR1 changes that require SSP restart, basically
55 * everything except the service and interrupt enables, the pxa270 developer
56 * manual says only SSCR1_SCFR, SSCR1_SPH, SSCR1_SPO need to be in this
57 * list, but the PXA255 dev man says all bits without really meaning the
58 * service and interrupt enables
59 */
60 #define SSCR1_CHANGE_MASK (SSCR1_TTELP | SSCR1_TTE | SSCR1_SCFR \
61 | SSCR1_ECRA | SSCR1_ECRB | SSCR1_SCLKDIR \
62 | SSCR1_SFRMDIR | SSCR1_RWOT | SSCR1_TRAIL \
63 | SSCR1_IFS | SSCR1_STRF | SSCR1_EFWR \
64 | SSCR1_RFT | SSCR1_TFT | SSCR1_MWDS \
65 | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM)
66
67 #define LPSS_RX_THRESH_DFLT 64
68 #define LPSS_TX_LOTHRESH_DFLT 160
69 #define LPSS_TX_HITHRESH_DFLT 224
70
71 /* Offset from drv_data->lpss_base */
72 #define GENERAL_REG 0x08
73 #define GENERAL_REG_RXTO_HOLDOFF_DISABLE BIT(24)
74 #define SSP_REG 0x0c
75 #define SPI_CS_CONTROL 0x18
76 #define SPI_CS_CONTROL_SW_MODE BIT(0)
77 #define SPI_CS_CONTROL_CS_HIGH BIT(1)
78
79 static bool is_lpss_ssp(const struct driver_data *drv_data)
80 {
81 return drv_data->ssp_type == LPSS_SSP;
82 }
83
84 /*
85 * Read and write LPSS SSP private registers. Caller must first check that
86 * is_lpss_ssp() returns true before these can be called.
87 */
88 static u32 __lpss_ssp_read_priv(struct driver_data *drv_data, unsigned offset)
89 {
90 WARN_ON(!drv_data->lpss_base);
91 return readl(drv_data->lpss_base + offset);
92 }
93
94 static void __lpss_ssp_write_priv(struct driver_data *drv_data,
95 unsigned offset, u32 value)
96 {
97 WARN_ON(!drv_data->lpss_base);
98 writel(value, drv_data->lpss_base + offset);
99 }
100
101 /*
102 * lpss_ssp_setup - perform LPSS SSP specific setup
103 * @drv_data: pointer to the driver private data
104 *
105 * Perform LPSS SSP specific setup. This function must be called first if
106 * one is going to use LPSS SSP private registers.
107 */
108 static void lpss_ssp_setup(struct driver_data *drv_data)
109 {
110 unsigned offset = 0x400;
111 u32 value, orig;
112
113 if (!is_lpss_ssp(drv_data))
114 return;
115
116 /*
117 * Perform auto-detection of the LPSS SSP private registers. They
118 * can be either at 1k or 2k offset from the base address.
119 */
120 orig = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL);
121
122 value = orig | SPI_CS_CONTROL_SW_MODE;
123 writel(value, drv_data->ioaddr + offset + SPI_CS_CONTROL);
124 value = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL);
125 if (value != (orig | SPI_CS_CONTROL_SW_MODE)) {
126 offset = 0x800;
127 goto detection_done;
128 }
129
130 value &= ~SPI_CS_CONTROL_SW_MODE;
131 writel(value, drv_data->ioaddr + offset + SPI_CS_CONTROL);
132 value = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL);
133 if (value != orig) {
134 offset = 0x800;
135 goto detection_done;
136 }
137
138 detection_done:
139 /* Now set the LPSS base */
140 drv_data->lpss_base = drv_data->ioaddr + offset;
141
142 /* Enable software chip select control */
143 value = SPI_CS_CONTROL_SW_MODE | SPI_CS_CONTROL_CS_HIGH;
144 __lpss_ssp_write_priv(drv_data, SPI_CS_CONTROL, value);
145
146 /* Enable multiblock DMA transfers */
147 if (drv_data->master_info->enable_dma) {
148 __lpss_ssp_write_priv(drv_data, SSP_REG, 1);
149
150 value = __lpss_ssp_read_priv(drv_data, GENERAL_REG);
151 value |= GENERAL_REG_RXTO_HOLDOFF_DISABLE;
152 __lpss_ssp_write_priv(drv_data, GENERAL_REG, value);
153 }
154 }
155
156 static void lpss_ssp_cs_control(struct driver_data *drv_data, bool enable)
157 {
158 u32 value;
159
160 if (!is_lpss_ssp(drv_data))
161 return;
162
163 value = __lpss_ssp_read_priv(drv_data, SPI_CS_CONTROL);
164 if (enable)
165 value &= ~SPI_CS_CONTROL_CS_HIGH;
166 else
167 value |= SPI_CS_CONTROL_CS_HIGH;
168 __lpss_ssp_write_priv(drv_data, SPI_CS_CONTROL, value);
169 }
170
171 static void cs_assert(struct driver_data *drv_data)
172 {
173 struct chip_data *chip = drv_data->cur_chip;
174
175 if (drv_data->ssp_type == CE4100_SSP) {
176 write_SSSR(drv_data->cur_chip->frm, drv_data->ioaddr);
177 return;
178 }
179
180 if (chip->cs_control) {
181 chip->cs_control(PXA2XX_CS_ASSERT);
182 return;
183 }
184
185 if (gpio_is_valid(chip->gpio_cs)) {
186 gpio_set_value(chip->gpio_cs, chip->gpio_cs_inverted);
187 return;
188 }
189
190 lpss_ssp_cs_control(drv_data, true);
191 }
192
193 static void cs_deassert(struct driver_data *drv_data)
194 {
195 struct chip_data *chip = drv_data->cur_chip;
196
197 if (drv_data->ssp_type == CE4100_SSP)
198 return;
199
200 if (chip->cs_control) {
201 chip->cs_control(PXA2XX_CS_DEASSERT);
202 return;
203 }
204
205 if (gpio_is_valid(chip->gpio_cs)) {
206 gpio_set_value(chip->gpio_cs, !chip->gpio_cs_inverted);
207 return;
208 }
209
210 lpss_ssp_cs_control(drv_data, false);
211 }
212
213 int pxa2xx_spi_flush(struct driver_data *drv_data)
214 {
215 unsigned long limit = loops_per_jiffy << 1;
216
217 void __iomem *reg = drv_data->ioaddr;
218
219 do {
220 while (read_SSSR(reg) & SSSR_RNE) {
221 read_SSDR(reg);
222 }
223 } while ((read_SSSR(reg) & SSSR_BSY) && --limit);
224 write_SSSR_CS(drv_data, SSSR_ROR);
225
226 return limit;
227 }
228
229 static int null_writer(struct driver_data *drv_data)
230 {
231 void __iomem *reg = drv_data->ioaddr;
232 u8 n_bytes = drv_data->n_bytes;
233
234 if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK)
235 || (drv_data->tx == drv_data->tx_end))
236 return 0;
237
238 write_SSDR(0, reg);
239 drv_data->tx += n_bytes;
240
241 return 1;
242 }
243
244 static int null_reader(struct driver_data *drv_data)
245 {
246 void __iomem *reg = drv_data->ioaddr;
247 u8 n_bytes = drv_data->n_bytes;
248
249 while ((read_SSSR(reg) & SSSR_RNE)
250 && (drv_data->rx < drv_data->rx_end)) {
251 read_SSDR(reg);
252 drv_data->rx += n_bytes;
253 }
254
255 return drv_data->rx == drv_data->rx_end;
256 }
257
258 static int u8_writer(struct driver_data *drv_data)
259 {
260 void __iomem *reg = drv_data->ioaddr;
261
262 if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK)
263 || (drv_data->tx == drv_data->tx_end))
264 return 0;
265
266 write_SSDR(*(u8 *)(drv_data->tx), reg);
267 ++drv_data->tx;
268
269 return 1;
270 }
271
272 static int u8_reader(struct driver_data *drv_data)
273 {
274 void __iomem *reg = drv_data->ioaddr;
275
276 while ((read_SSSR(reg) & SSSR_RNE)
277 && (drv_data->rx < drv_data->rx_end)) {
278 *(u8 *)(drv_data->rx) = read_SSDR(reg);
279 ++drv_data->rx;
280 }
281
282 return drv_data->rx == drv_data->rx_end;
283 }
284
285 static int u16_writer(struct driver_data *drv_data)
286 {
287 void __iomem *reg = drv_data->ioaddr;
288
289 if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK)
290 || (drv_data->tx == drv_data->tx_end))
291 return 0;
292
293 write_SSDR(*(u16 *)(drv_data->tx), reg);
294 drv_data->tx += 2;
295
296 return 1;
297 }
298
299 static int u16_reader(struct driver_data *drv_data)
300 {
301 void __iomem *reg = drv_data->ioaddr;
302
303 while ((read_SSSR(reg) & SSSR_RNE)
304 && (drv_data->rx < drv_data->rx_end)) {
305 *(u16 *)(drv_data->rx) = read_SSDR(reg);
306 drv_data->rx += 2;
307 }
308
309 return drv_data->rx == drv_data->rx_end;
310 }
311
312 static int u32_writer(struct driver_data *drv_data)
313 {
314 void __iomem *reg = drv_data->ioaddr;
315
316 if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK)
317 || (drv_data->tx == drv_data->tx_end))
318 return 0;
319
320 write_SSDR(*(u32 *)(drv_data->tx), reg);
321 drv_data->tx += 4;
322
323 return 1;
324 }
325
326 static int u32_reader(struct driver_data *drv_data)
327 {
328 void __iomem *reg = drv_data->ioaddr;
329
330 while ((read_SSSR(reg) & SSSR_RNE)
331 && (drv_data->rx < drv_data->rx_end)) {
332 *(u32 *)(drv_data->rx) = read_SSDR(reg);
333 drv_data->rx += 4;
334 }
335
336 return drv_data->rx == drv_data->rx_end;
337 }
338
339 void *pxa2xx_spi_next_transfer(struct driver_data *drv_data)
340 {
341 struct spi_message *msg = drv_data->cur_msg;
342 struct spi_transfer *trans = drv_data->cur_transfer;
343
344 /* Move to next transfer */
345 if (trans->transfer_list.next != &msg->transfers) {
346 drv_data->cur_transfer =
347 list_entry(trans->transfer_list.next,
348 struct spi_transfer,
349 transfer_list);
350 return RUNNING_STATE;
351 } else
352 return DONE_STATE;
353 }
354
355 /* caller already set message->status; dma and pio irqs are blocked */
356 static void giveback(struct driver_data *drv_data)
357 {
358 struct spi_transfer* last_transfer;
359 struct spi_message *msg;
360
361 msg = drv_data->cur_msg;
362 drv_data->cur_msg = NULL;
363 drv_data->cur_transfer = NULL;
364
365 last_transfer = list_entry(msg->transfers.prev,
366 struct spi_transfer,
367 transfer_list);
368
369 /* Delay if requested before any change in chip select */
370 if (last_transfer->delay_usecs)
371 udelay(last_transfer->delay_usecs);
372
373 /* Drop chip select UNLESS cs_change is true or we are returning
374 * a message with an error, or next message is for another chip
375 */
376 if (!last_transfer->cs_change)
377 cs_deassert(drv_data);
378 else {
379 struct spi_message *next_msg;
380
381 /* Holding of cs was hinted, but we need to make sure
382 * the next message is for the same chip. Don't waste
383 * time with the following tests unless this was hinted.
384 *
385 * We cannot postpone this until pump_messages, because
386 * after calling msg->complete (below) the driver that
387 * sent the current message could be unloaded, which
388 * could invalidate the cs_control() callback...
389 */
390
391 /* get a pointer to the next message, if any */
392 next_msg = spi_get_next_queued_message(drv_data->master);
393
394 /* see if the next and current messages point
395 * to the same chip
396 */
397 if (next_msg && next_msg->spi != msg->spi)
398 next_msg = NULL;
399 if (!next_msg || msg->state == ERROR_STATE)
400 cs_deassert(drv_data);
401 }
402
403 drv_data->cur_chip = NULL;
404 spi_finalize_current_message(drv_data->master);
405 }
406
407 static void reset_sccr1(struct driver_data *drv_data)
408 {
409 void __iomem *reg = drv_data->ioaddr;
410 struct chip_data *chip = drv_data->cur_chip;
411 u32 sccr1_reg;
412
413 sccr1_reg = read_SSCR1(reg) & ~drv_data->int_cr1;
414 sccr1_reg &= ~SSCR1_RFT;
415 sccr1_reg |= chip->threshold;
416 write_SSCR1(sccr1_reg, reg);
417 }
418
419 static void int_error_stop(struct driver_data *drv_data, const char* msg)
420 {
421 void __iomem *reg = drv_data->ioaddr;
422
423 /* Stop and reset SSP */
424 write_SSSR_CS(drv_data, drv_data->clear_sr);
425 reset_sccr1(drv_data);
426 if (!pxa25x_ssp_comp(drv_data))
427 write_SSTO(0, reg);
428 pxa2xx_spi_flush(drv_data);
429 write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
430
431 dev_err(&drv_data->pdev->dev, "%s\n", msg);
432
433 drv_data->cur_msg->state = ERROR_STATE;
434 tasklet_schedule(&drv_data->pump_transfers);
435 }
436
437 static void int_transfer_complete(struct driver_data *drv_data)
438 {
439 void __iomem *reg = drv_data->ioaddr;
440
441 /* Stop SSP */
442 write_SSSR_CS(drv_data, drv_data->clear_sr);
443 reset_sccr1(drv_data);
444 if (!pxa25x_ssp_comp(drv_data))
445 write_SSTO(0, reg);
446
447 /* Update total byte transferred return count actual bytes read */
448 drv_data->cur_msg->actual_length += drv_data->len -
449 (drv_data->rx_end - drv_data->rx);
450
451 /* Transfer delays and chip select release are
452 * handled in pump_transfers or giveback
453 */
454
455 /* Move to next transfer */
456 drv_data->cur_msg->state = pxa2xx_spi_next_transfer(drv_data);
457
458 /* Schedule transfer tasklet */
459 tasklet_schedule(&drv_data->pump_transfers);
460 }
461
462 static irqreturn_t interrupt_transfer(struct driver_data *drv_data)
463 {
464 void __iomem *reg = drv_data->ioaddr;
465
466 u32 irq_mask = (read_SSCR1(reg) & SSCR1_TIE) ?
467 drv_data->mask_sr : drv_data->mask_sr & ~SSSR_TFS;
468
469 u32 irq_status = read_SSSR(reg) & irq_mask;
470
471 if (irq_status & SSSR_ROR) {
472 int_error_stop(drv_data, "interrupt_transfer: fifo overrun");
473 return IRQ_HANDLED;
474 }
475
476 if (irq_status & SSSR_TINT) {
477 write_SSSR(SSSR_TINT, reg);
478 if (drv_data->read(drv_data)) {
479 int_transfer_complete(drv_data);
480 return IRQ_HANDLED;
481 }
482 }
483
484 /* Drain rx fifo, Fill tx fifo and prevent overruns */
485 do {
486 if (drv_data->read(drv_data)) {
487 int_transfer_complete(drv_data);
488 return IRQ_HANDLED;
489 }
490 } while (drv_data->write(drv_data));
491
492 if (drv_data->read(drv_data)) {
493 int_transfer_complete(drv_data);
494 return IRQ_HANDLED;
495 }
496
497 if (drv_data->tx == drv_data->tx_end) {
498 u32 bytes_left;
499 u32 sccr1_reg;
500
501 sccr1_reg = read_SSCR1(reg);
502 sccr1_reg &= ~SSCR1_TIE;
503
504 /*
505 * PXA25x_SSP has no timeout, set up rx threshould for the
506 * remaining RX bytes.
507 */
508 if (pxa25x_ssp_comp(drv_data)) {
509
510 sccr1_reg &= ~SSCR1_RFT;
511
512 bytes_left = drv_data->rx_end - drv_data->rx;
513 switch (drv_data->n_bytes) {
514 case 4:
515 bytes_left >>= 1;
516 case 2:
517 bytes_left >>= 1;
518 }
519
520 if (bytes_left > RX_THRESH_DFLT)
521 bytes_left = RX_THRESH_DFLT;
522
523 sccr1_reg |= SSCR1_RxTresh(bytes_left);
524 }
525 write_SSCR1(sccr1_reg, reg);
526 }
527
528 /* We did something */
529 return IRQ_HANDLED;
530 }
531
532 static irqreturn_t ssp_int(int irq, void *dev_id)
533 {
534 struct driver_data *drv_data = dev_id;
535 void __iomem *reg = drv_data->ioaddr;
536 u32 sccr1_reg;
537 u32 mask = drv_data->mask_sr;
538 u32 status;
539
540 /*
541 * The IRQ might be shared with other peripherals so we must first
542 * check that are we RPM suspended or not. If we are we assume that
543 * the IRQ was not for us (we shouldn't be RPM suspended when the
544 * interrupt is enabled).
545 */
546 if (pm_runtime_suspended(&drv_data->pdev->dev))
547 return IRQ_NONE;
548
549 /*
550 * If the device is not yet in RPM suspended state and we get an
551 * interrupt that is meant for another device, check if status bits
552 * are all set to one. That means that the device is already
553 * powered off.
554 */
555 status = read_SSSR(reg);
556 if (status == ~0)
557 return IRQ_NONE;
558
559 sccr1_reg = read_SSCR1(reg);
560
561 /* Ignore possible writes if we don't need to write */
562 if (!(sccr1_reg & SSCR1_TIE))
563 mask &= ~SSSR_TFS;
564
565 /* Ignore RX timeout interrupt if it is disabled */
566 if (!(sccr1_reg & SSCR1_TINTE))
567 mask &= ~SSSR_TINT;
568
569 if (!(status & mask))
570 return IRQ_NONE;
571
572 if (!drv_data->cur_msg) {
573
574 write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
575 write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg);
576 if (!pxa25x_ssp_comp(drv_data))
577 write_SSTO(0, reg);
578 write_SSSR_CS(drv_data, drv_data->clear_sr);
579
580 dev_err(&drv_data->pdev->dev, "bad message state "
581 "in interrupt handler\n");
582
583 /* Never fail */
584 return IRQ_HANDLED;
585 }
586
587 return drv_data->transfer_handler(drv_data);
588 }
589
590 static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate)
591 {
592 unsigned long ssp_clk = drv_data->max_clk_rate;
593 const struct ssp_device *ssp = drv_data->ssp;
594
595 rate = min_t(int, ssp_clk, rate);
596
597 if (ssp->type == PXA25x_SSP || ssp->type == CE4100_SSP)
598 return ((ssp_clk / (2 * rate) - 1) & 0xff) << 8;
599 else
600 return ((ssp_clk / rate - 1) & 0xfff) << 8;
601 }
602
603 static void pump_transfers(unsigned long data)
604 {
605 struct driver_data *drv_data = (struct driver_data *)data;
606 struct spi_message *message = NULL;
607 struct spi_transfer *transfer = NULL;
608 struct spi_transfer *previous = NULL;
609 struct chip_data *chip = NULL;
610 void __iomem *reg = drv_data->ioaddr;
611 u32 clk_div = 0;
612 u8 bits = 0;
613 u32 speed = 0;
614 u32 cr0;
615 u32 cr1;
616 u32 dma_thresh = drv_data->cur_chip->dma_threshold;
617 u32 dma_burst = drv_data->cur_chip->dma_burst_size;
618
619 /* Get current state information */
620 message = drv_data->cur_msg;
621 transfer = drv_data->cur_transfer;
622 chip = drv_data->cur_chip;
623
624 /* Handle for abort */
625 if (message->state == ERROR_STATE) {
626 message->status = -EIO;
627 giveback(drv_data);
628 return;
629 }
630
631 /* Handle end of message */
632 if (message->state == DONE_STATE) {
633 message->status = 0;
634 giveback(drv_data);
635 return;
636 }
637
638 /* Delay if requested at end of transfer before CS change */
639 if (message->state == RUNNING_STATE) {
640 previous = list_entry(transfer->transfer_list.prev,
641 struct spi_transfer,
642 transfer_list);
643 if (previous->delay_usecs)
644 udelay(previous->delay_usecs);
645
646 /* Drop chip select only if cs_change is requested */
647 if (previous->cs_change)
648 cs_deassert(drv_data);
649 }
650
651 /* Check if we can DMA this transfer */
652 if (!pxa2xx_spi_dma_is_possible(transfer->len) && chip->enable_dma) {
653
654 /* reject already-mapped transfers; PIO won't always work */
655 if (message->is_dma_mapped
656 || transfer->rx_dma || transfer->tx_dma) {
657 dev_err(&drv_data->pdev->dev,
658 "pump_transfers: mapped transfer length "
659 "of %u is greater than %d\n",
660 transfer->len, MAX_DMA_LEN);
661 message->status = -EINVAL;
662 giveback(drv_data);
663 return;
664 }
665
666 /* warn ... we force this to PIO mode */
667 if (printk_ratelimit())
668 dev_warn(&message->spi->dev, "pump_transfers: "
669 "DMA disabled for transfer length %ld "
670 "greater than %d\n",
671 (long)drv_data->len, MAX_DMA_LEN);
672 }
673
674 /* Setup the transfer state based on the type of transfer */
675 if (pxa2xx_spi_flush(drv_data) == 0) {
676 dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n");
677 message->status = -EIO;
678 giveback(drv_data);
679 return;
680 }
681 drv_data->n_bytes = chip->n_bytes;
682 drv_data->tx = (void *)transfer->tx_buf;
683 drv_data->tx_end = drv_data->tx + transfer->len;
684 drv_data->rx = transfer->rx_buf;
685 drv_data->rx_end = drv_data->rx + transfer->len;
686 drv_data->rx_dma = transfer->rx_dma;
687 drv_data->tx_dma = transfer->tx_dma;
688 drv_data->len = transfer->len;
689 drv_data->write = drv_data->tx ? chip->write : null_writer;
690 drv_data->read = drv_data->rx ? chip->read : null_reader;
691
692 /* Change speed and bit per word on a per transfer */
693 cr0 = chip->cr0;
694 if (transfer->speed_hz || transfer->bits_per_word) {
695
696 bits = chip->bits_per_word;
697 speed = chip->speed_hz;
698
699 if (transfer->speed_hz)
700 speed = transfer->speed_hz;
701
702 if (transfer->bits_per_word)
703 bits = transfer->bits_per_word;
704
705 clk_div = ssp_get_clk_div(drv_data, speed);
706
707 if (bits <= 8) {
708 drv_data->n_bytes = 1;
709 drv_data->read = drv_data->read != null_reader ?
710 u8_reader : null_reader;
711 drv_data->write = drv_data->write != null_writer ?
712 u8_writer : null_writer;
713 } else if (bits <= 16) {
714 drv_data->n_bytes = 2;
715 drv_data->read = drv_data->read != null_reader ?
716 u16_reader : null_reader;
717 drv_data->write = drv_data->write != null_writer ?
718 u16_writer : null_writer;
719 } else if (bits <= 32) {
720 drv_data->n_bytes = 4;
721 drv_data->read = drv_data->read != null_reader ?
722 u32_reader : null_reader;
723 drv_data->write = drv_data->write != null_writer ?
724 u32_writer : null_writer;
725 }
726 /* if bits/word is changed in dma mode, then must check the
727 * thresholds and burst also */
728 if (chip->enable_dma) {
729 if (pxa2xx_spi_set_dma_burst_and_threshold(chip,
730 message->spi,
731 bits, &dma_burst,
732 &dma_thresh))
733 if (printk_ratelimit())
734 dev_warn(&message->spi->dev,
735 "pump_transfers: "
736 "DMA burst size reduced to "
737 "match bits_per_word\n");
738 }
739
740 cr0 = clk_div
741 | SSCR0_Motorola
742 | SSCR0_DataSize(bits > 16 ? bits - 16 : bits)
743 | SSCR0_SSE
744 | (bits > 16 ? SSCR0_EDSS : 0);
745 }
746
747 message->state = RUNNING_STATE;
748
749 drv_data->dma_mapped = 0;
750 if (pxa2xx_spi_dma_is_possible(drv_data->len))
751 drv_data->dma_mapped = pxa2xx_spi_map_dma_buffers(drv_data);
752 if (drv_data->dma_mapped) {
753
754 /* Ensure we have the correct interrupt handler */
755 drv_data->transfer_handler = pxa2xx_spi_dma_transfer;
756
757 pxa2xx_spi_dma_prepare(drv_data, dma_burst);
758
759 /* Clear status and start DMA engine */
760 cr1 = chip->cr1 | dma_thresh | drv_data->dma_cr1;
761 write_SSSR(drv_data->clear_sr, reg);
762
763 pxa2xx_spi_dma_start(drv_data);
764 } else {
765 /* Ensure we have the correct interrupt handler */
766 drv_data->transfer_handler = interrupt_transfer;
767
768 /* Clear status */
769 cr1 = chip->cr1 | chip->threshold | drv_data->int_cr1;
770 write_SSSR_CS(drv_data, drv_data->clear_sr);
771 }
772
773 if (is_lpss_ssp(drv_data)) {
774 if ((read_SSIRF(reg) & 0xff) != chip->lpss_rx_threshold)
775 write_SSIRF(chip->lpss_rx_threshold, reg);
776 if ((read_SSITF(reg) & 0xffff) != chip->lpss_tx_threshold)
777 write_SSITF(chip->lpss_tx_threshold, reg);
778 }
779
780 /* see if we need to reload the config registers */
781 if ((read_SSCR0(reg) != cr0)
782 || (read_SSCR1(reg) & SSCR1_CHANGE_MASK) !=
783 (cr1 & SSCR1_CHANGE_MASK)) {
784
785 /* stop the SSP, and update the other bits */
786 write_SSCR0(cr0 & ~SSCR0_SSE, reg);
787 if (!pxa25x_ssp_comp(drv_data))
788 write_SSTO(chip->timeout, reg);
789 /* first set CR1 without interrupt and service enables */
790 write_SSCR1(cr1 & SSCR1_CHANGE_MASK, reg);
791 /* restart the SSP */
792 write_SSCR0(cr0, reg);
793
794 } else {
795 if (!pxa25x_ssp_comp(drv_data))
796 write_SSTO(chip->timeout, reg);
797 }
798
799 cs_assert(drv_data);
800
801 /* after chip select, release the data by enabling service
802 * requests and interrupts, without changing any mode bits */
803 write_SSCR1(cr1, reg);
804 }
805
806 static int pxa2xx_spi_transfer_one_message(struct spi_master *master,
807 struct spi_message *msg)
808 {
809 struct driver_data *drv_data = spi_master_get_devdata(master);
810
811 drv_data->cur_msg = msg;
812 /* Initial message state*/
813 drv_data->cur_msg->state = START_STATE;
814 drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next,
815 struct spi_transfer,
816 transfer_list);
817
818 /* prepare to setup the SSP, in pump_transfers, using the per
819 * chip configuration */
820 drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi);
821
822 /* Mark as busy and launch transfers */
823 tasklet_schedule(&drv_data->pump_transfers);
824 return 0;
825 }
826
827 static int pxa2xx_spi_unprepare_transfer(struct spi_master *master)
828 {
829 struct driver_data *drv_data = spi_master_get_devdata(master);
830
831 /* Disable the SSP now */
832 write_SSCR0(read_SSCR0(drv_data->ioaddr) & ~SSCR0_SSE,
833 drv_data->ioaddr);
834
835 return 0;
836 }
837
838 static int setup_cs(struct spi_device *spi, struct chip_data *chip,
839 struct pxa2xx_spi_chip *chip_info)
840 {
841 int err = 0;
842
843 if (chip == NULL || chip_info == NULL)
844 return 0;
845
846 /* NOTE: setup() can be called multiple times, possibly with
847 * different chip_info, release previously requested GPIO
848 */
849 if (gpio_is_valid(chip->gpio_cs))
850 gpio_free(chip->gpio_cs);
851
852 /* If (*cs_control) is provided, ignore GPIO chip select */
853 if (chip_info->cs_control) {
854 chip->cs_control = chip_info->cs_control;
855 return 0;
856 }
857
858 if (gpio_is_valid(chip_info->gpio_cs)) {
859 err = gpio_request(chip_info->gpio_cs, "SPI_CS");
860 if (err) {
861 dev_err(&spi->dev, "failed to request chip select "
862 "GPIO%d\n", chip_info->gpio_cs);
863 return err;
864 }
865
866 chip->gpio_cs = chip_info->gpio_cs;
867 chip->gpio_cs_inverted = spi->mode & SPI_CS_HIGH;
868
869 err = gpio_direction_output(chip->gpio_cs,
870 !chip->gpio_cs_inverted);
871 }
872
873 return err;
874 }
875
876 static int setup(struct spi_device *spi)
877 {
878 struct pxa2xx_spi_chip *chip_info = NULL;
879 struct chip_data *chip;
880 struct driver_data *drv_data = spi_master_get_devdata(spi->master);
881 unsigned int clk_div;
882 uint tx_thres, tx_hi_thres, rx_thres;
883
884 if (is_lpss_ssp(drv_data)) {
885 tx_thres = LPSS_TX_LOTHRESH_DFLT;
886 tx_hi_thres = LPSS_TX_HITHRESH_DFLT;
887 rx_thres = LPSS_RX_THRESH_DFLT;
888 } else {
889 tx_thres = TX_THRESH_DFLT;
890 tx_hi_thres = 0;
891 rx_thres = RX_THRESH_DFLT;
892 }
893
894 /* Only alloc on first setup */
895 chip = spi_get_ctldata(spi);
896 if (!chip) {
897 chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
898 if (!chip) {
899 dev_err(&spi->dev,
900 "failed setup: can't allocate chip data\n");
901 return -ENOMEM;
902 }
903
904 if (drv_data->ssp_type == CE4100_SSP) {
905 if (spi->chip_select > 4) {
906 dev_err(&spi->dev, "failed setup: "
907 "cs number must not be > 4.\n");
908 kfree(chip);
909 return -EINVAL;
910 }
911
912 chip->frm = spi->chip_select;
913 } else
914 chip->gpio_cs = -1;
915 chip->enable_dma = 0;
916 chip->timeout = TIMOUT_DFLT;
917 }
918
919 /* protocol drivers may change the chip settings, so...
920 * if chip_info exists, use it */
921 chip_info = spi->controller_data;
922
923 /* chip_info isn't always needed */
924 chip->cr1 = 0;
925 if (chip_info) {
926 if (chip_info->timeout)
927 chip->timeout = chip_info->timeout;
928 if (chip_info->tx_threshold)
929 tx_thres = chip_info->tx_threshold;
930 if (chip_info->tx_hi_threshold)
931 tx_hi_thres = chip_info->tx_hi_threshold;
932 if (chip_info->rx_threshold)
933 rx_thres = chip_info->rx_threshold;
934 chip->enable_dma = drv_data->master_info->enable_dma;
935 chip->dma_threshold = 0;
936 if (chip_info->enable_loopback)
937 chip->cr1 = SSCR1_LBM;
938 } else if (ACPI_HANDLE(&spi->dev)) {
939 /*
940 * Slave devices enumerated from ACPI namespace don't
941 * usually have chip_info but we still might want to use
942 * DMA with them.
943 */
944 chip->enable_dma = drv_data->master_info->enable_dma;
945 }
946
947 chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) |
948 (SSCR1_TxTresh(tx_thres) & SSCR1_TFT);
949
950 chip->lpss_rx_threshold = SSIRF_RxThresh(rx_thres);
951 chip->lpss_tx_threshold = SSITF_TxLoThresh(tx_thres)
952 | SSITF_TxHiThresh(tx_hi_thres);
953
954 /* set dma burst and threshold outside of chip_info path so that if
955 * chip_info goes away after setting chip->enable_dma, the
956 * burst and threshold can still respond to changes in bits_per_word */
957 if (chip->enable_dma) {
958 /* set up legal burst and threshold for dma */
959 if (pxa2xx_spi_set_dma_burst_and_threshold(chip, spi,
960 spi->bits_per_word,
961 &chip->dma_burst_size,
962 &chip->dma_threshold)) {
963 dev_warn(&spi->dev, "in setup: DMA burst size reduced "
964 "to match bits_per_word\n");
965 }
966 }
967
968 clk_div = ssp_get_clk_div(drv_data, spi->max_speed_hz);
969 chip->speed_hz = spi->max_speed_hz;
970
971 chip->cr0 = clk_div
972 | SSCR0_Motorola
973 | SSCR0_DataSize(spi->bits_per_word > 16 ?
974 spi->bits_per_word - 16 : spi->bits_per_word)
975 | SSCR0_SSE
976 | (spi->bits_per_word > 16 ? SSCR0_EDSS : 0);
977 chip->cr1 &= ~(SSCR1_SPO | SSCR1_SPH);
978 chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) ? SSCR1_SPH : 0)
979 | (((spi->mode & SPI_CPOL) != 0) ? SSCR1_SPO : 0);
980
981 if (spi->mode & SPI_LOOP)
982 chip->cr1 |= SSCR1_LBM;
983
984 /* NOTE: PXA25x_SSP _could_ use external clocking ... */
985 if (!pxa25x_ssp_comp(drv_data))
986 dev_dbg(&spi->dev, "%ld Hz actual, %s\n",
987 drv_data->max_clk_rate
988 / (1 + ((chip->cr0 & SSCR0_SCR(0xfff)) >> 8)),
989 chip->enable_dma ? "DMA" : "PIO");
990 else
991 dev_dbg(&spi->dev, "%ld Hz actual, %s\n",
992 drv_data->max_clk_rate / 2
993 / (1 + ((chip->cr0 & SSCR0_SCR(0x0ff)) >> 8)),
994 chip->enable_dma ? "DMA" : "PIO");
995
996 if (spi->bits_per_word <= 8) {
997 chip->n_bytes = 1;
998 chip->read = u8_reader;
999 chip->write = u8_writer;
1000 } else if (spi->bits_per_word <= 16) {
1001 chip->n_bytes = 2;
1002 chip->read = u16_reader;
1003 chip->write = u16_writer;
1004 } else if (spi->bits_per_word <= 32) {
1005 chip->cr0 |= SSCR0_EDSS;
1006 chip->n_bytes = 4;
1007 chip->read = u32_reader;
1008 chip->write = u32_writer;
1009 }
1010 chip->bits_per_word = spi->bits_per_word;
1011
1012 spi_set_ctldata(spi, chip);
1013
1014 if (drv_data->ssp_type == CE4100_SSP)
1015 return 0;
1016
1017 return setup_cs(spi, chip, chip_info);
1018 }
1019
1020 static void cleanup(struct spi_device *spi)
1021 {
1022 struct chip_data *chip = spi_get_ctldata(spi);
1023 struct driver_data *drv_data = spi_master_get_devdata(spi->master);
1024
1025 if (!chip)
1026 return;
1027
1028 if (drv_data->ssp_type != CE4100_SSP && gpio_is_valid(chip->gpio_cs))
1029 gpio_free(chip->gpio_cs);
1030
1031 kfree(chip);
1032 }
1033
1034 #ifdef CONFIG_ACPI
1035 static struct pxa2xx_spi_master *
1036 pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
1037 {
1038 struct pxa2xx_spi_master *pdata;
1039 struct acpi_device *adev;
1040 struct ssp_device *ssp;
1041 struct resource *res;
1042 int devid;
1043
1044 if (!ACPI_HANDLE(&pdev->dev) ||
1045 acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
1046 return NULL;
1047
1048 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
1049 if (!pdata) {
1050 dev_err(&pdev->dev,
1051 "failed to allocate memory for platform data\n");
1052 return NULL;
1053 }
1054
1055 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1056 if (!res)
1057 return NULL;
1058
1059 ssp = &pdata->ssp;
1060
1061 ssp->phys_base = res->start;
1062 ssp->mmio_base = devm_ioremap_resource(&pdev->dev, res);
1063 if (IS_ERR(ssp->mmio_base))
1064 return NULL;
1065
1066 ssp->clk = devm_clk_get(&pdev->dev, NULL);
1067 ssp->irq = platform_get_irq(pdev, 0);
1068 ssp->type = LPSS_SSP;
1069 ssp->pdev = pdev;
1070
1071 ssp->port_id = -1;
1072 if (adev->pnp.unique_id && !kstrtoint(adev->pnp.unique_id, 0, &devid))
1073 ssp->port_id = devid;
1074
1075 pdata->num_chipselect = 1;
1076 pdata->enable_dma = true;
1077 pdata->tx_chan_id = -1;
1078 pdata->rx_chan_id = -1;
1079
1080 return pdata;
1081 }
1082
1083 static struct acpi_device_id pxa2xx_spi_acpi_match[] = {
1084 { "INT33C0", 0 },
1085 { "INT33C1", 0 },
1086 { "INT3430", 0 },
1087 { "INT3431", 0 },
1088 { "80860F0E", 0 },
1089 { "8086228E", 0 },
1090 { },
1091 };
1092 MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match);
1093 #else
1094 static inline struct pxa2xx_spi_master *
1095 pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
1096 {
1097 return NULL;
1098 }
1099 #endif
1100
1101 static int pxa2xx_spi_probe(struct platform_device *pdev)
1102 {
1103 struct device *dev = &pdev->dev;
1104 struct pxa2xx_spi_master *platform_info;
1105 struct spi_master *master;
1106 struct driver_data *drv_data;
1107 struct ssp_device *ssp;
1108 int status;
1109
1110 platform_info = dev_get_platdata(dev);
1111 if (!platform_info) {
1112 platform_info = pxa2xx_spi_acpi_get_pdata(pdev);
1113 if (!platform_info) {
1114 dev_err(&pdev->dev, "missing platform data\n");
1115 return -ENODEV;
1116 }
1117 }
1118
1119 ssp = pxa_ssp_request(pdev->id, pdev->name);
1120 if (!ssp)
1121 ssp = &platform_info->ssp;
1122
1123 if (!ssp->mmio_base) {
1124 dev_err(&pdev->dev, "failed to get ssp\n");
1125 return -ENODEV;
1126 }
1127
1128 /* Allocate master with space for drv_data and null dma buffer */
1129 master = spi_alloc_master(dev, sizeof(struct driver_data) + 16);
1130 if (!master) {
1131 dev_err(&pdev->dev, "cannot alloc spi_master\n");
1132 pxa_ssp_free(ssp);
1133 return -ENOMEM;
1134 }
1135 drv_data = spi_master_get_devdata(master);
1136 drv_data->master = master;
1137 drv_data->master_info = platform_info;
1138 drv_data->pdev = pdev;
1139 drv_data->ssp = ssp;
1140
1141 master->dev.parent = &pdev->dev;
1142 master->dev.of_node = pdev->dev.of_node;
1143 /* the spi->mode bits understood by this driver: */
1144 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;
1145
1146 master->bus_num = ssp->port_id;
1147 master->num_chipselect = platform_info->num_chipselect;
1148 master->dma_alignment = DMA_ALIGNMENT;
1149 master->cleanup = cleanup;
1150 master->setup = setup;
1151 master->transfer_one_message = pxa2xx_spi_transfer_one_message;
1152 master->unprepare_transfer_hardware = pxa2xx_spi_unprepare_transfer;
1153 master->auto_runtime_pm = true;
1154
1155 drv_data->ssp_type = ssp->type;
1156 drv_data->null_dma_buf = (u32 *)PTR_ALIGN(&drv_data[1], DMA_ALIGNMENT);
1157
1158 drv_data->ioaddr = ssp->mmio_base;
1159 drv_data->ssdr_physical = ssp->phys_base + SSDR;
1160 if (pxa25x_ssp_comp(drv_data)) {
1161 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
1162 drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE;
1163 drv_data->dma_cr1 = 0;
1164 drv_data->clear_sr = SSSR_ROR;
1165 drv_data->mask_sr = SSSR_RFS | SSSR_TFS | SSSR_ROR;
1166 } else {
1167 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
1168 drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE | SSCR1_TINTE;
1169 drv_data->dma_cr1 = DEFAULT_DMA_CR1;
1170 drv_data->clear_sr = SSSR_ROR | SSSR_TINT;
1171 drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR;
1172 }
1173
1174 status = request_irq(ssp->irq, ssp_int, IRQF_SHARED, dev_name(dev),
1175 drv_data);
1176 if (status < 0) {
1177 dev_err(&pdev->dev, "cannot get IRQ %d\n", ssp->irq);
1178 goto out_error_master_alloc;
1179 }
1180
1181 /* Setup DMA if requested */
1182 drv_data->tx_channel = -1;
1183 drv_data->rx_channel = -1;
1184 if (platform_info->enable_dma) {
1185 status = pxa2xx_spi_dma_setup(drv_data);
1186 if (status) {
1187 dev_dbg(dev, "no DMA channels available, using PIO\n");
1188 platform_info->enable_dma = false;
1189 }
1190 }
1191
1192 /* Enable SOC clock */
1193 clk_prepare_enable(ssp->clk);
1194
1195 drv_data->max_clk_rate = clk_get_rate(ssp->clk);
1196
1197 /* Load default SSP configuration */
1198 write_SSCR0(0, drv_data->ioaddr);
1199 write_SSCR1(SSCR1_RxTresh(RX_THRESH_DFLT) |
1200 SSCR1_TxTresh(TX_THRESH_DFLT),
1201 drv_data->ioaddr);
1202 write_SSCR0(SSCR0_SCR(2)
1203 | SSCR0_Motorola
1204 | SSCR0_DataSize(8),
1205 drv_data->ioaddr);
1206 if (!pxa25x_ssp_comp(drv_data))
1207 write_SSTO(0, drv_data->ioaddr);
1208 write_SSPSP(0, drv_data->ioaddr);
1209
1210 lpss_ssp_setup(drv_data);
1211
1212 tasklet_init(&drv_data->pump_transfers, pump_transfers,
1213 (unsigned long)drv_data);
1214
1215 /* Register with the SPI framework */
1216 platform_set_drvdata(pdev, drv_data);
1217 status = spi_register_master(master);
1218 if (status != 0) {
1219 dev_err(&pdev->dev, "problem registering spi master\n");
1220 goto out_error_clock_enabled;
1221 }
1222
1223 pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
1224 pm_runtime_use_autosuspend(&pdev->dev);
1225 pm_runtime_set_active(&pdev->dev);
1226 pm_runtime_enable(&pdev->dev);
1227
1228 return status;
1229
1230 out_error_clock_enabled:
1231 clk_disable_unprepare(ssp->clk);
1232 pxa2xx_spi_dma_release(drv_data);
1233 free_irq(ssp->irq, drv_data);
1234
1235 out_error_master_alloc:
1236 spi_master_put(master);
1237 pxa_ssp_free(ssp);
1238 return status;
1239 }
1240
1241 static int pxa2xx_spi_remove(struct platform_device *pdev)
1242 {
1243 struct driver_data *drv_data = platform_get_drvdata(pdev);
1244 struct ssp_device *ssp;
1245
1246 if (!drv_data)
1247 return 0;
1248 ssp = drv_data->ssp;
1249
1250 pm_runtime_get_sync(&pdev->dev);
1251
1252 /* Disable the SSP at the peripheral and SOC level */
1253 write_SSCR0(0, drv_data->ioaddr);
1254 clk_disable_unprepare(ssp->clk);
1255
1256 /* Release DMA */
1257 if (drv_data->master_info->enable_dma)
1258 pxa2xx_spi_dma_release(drv_data);
1259
1260 pm_runtime_put_noidle(&pdev->dev);
1261 pm_runtime_disable(&pdev->dev);
1262
1263 /* Release IRQ */
1264 free_irq(ssp->irq, drv_data);
1265
1266 /* Release SSP */
1267 pxa_ssp_free(ssp);
1268
1269 /* Disconnect from the SPI framework */
1270 spi_unregister_master(drv_data->master);
1271
1272 return 0;
1273 }
1274
1275 static void pxa2xx_spi_shutdown(struct platform_device *pdev)
1276 {
1277 int status = 0;
1278
1279 if ((status = pxa2xx_spi_remove(pdev)) != 0)
1280 dev_err(&pdev->dev, "shutdown failed with %d\n", status);
1281 }
1282
1283 #ifdef CONFIG_PM
1284 static int pxa2xx_spi_suspend(struct device *dev)
1285 {
1286 struct driver_data *drv_data = dev_get_drvdata(dev);
1287 struct ssp_device *ssp = drv_data->ssp;
1288 int status = 0;
1289
1290 status = spi_master_suspend(drv_data->master);
1291 if (status != 0)
1292 return status;
1293 write_SSCR0(0, drv_data->ioaddr);
1294
1295 if (!pm_runtime_suspended(dev))
1296 clk_disable_unprepare(ssp->clk);
1297
1298 return 0;
1299 }
1300
1301 static int pxa2xx_spi_resume(struct device *dev)
1302 {
1303 struct driver_data *drv_data = dev_get_drvdata(dev);
1304 struct ssp_device *ssp = drv_data->ssp;
1305 int status = 0;
1306
1307 pxa2xx_spi_dma_resume(drv_data);
1308
1309 /* Enable the SSP clock */
1310 if (!pm_runtime_suspended(dev))
1311 clk_prepare_enable(ssp->clk);
1312
1313 /* Start the queue running */
1314 status = spi_master_resume(drv_data->master);
1315 if (status != 0) {
1316 dev_err(dev, "problem starting queue (%d)\n", status);
1317 return status;
1318 }
1319
1320 return 0;
1321 }
1322 #endif
1323
1324 #ifdef CONFIG_PM_RUNTIME
1325 static int pxa2xx_spi_runtime_suspend(struct device *dev)
1326 {
1327 struct driver_data *drv_data = dev_get_drvdata(dev);
1328
1329 clk_disable_unprepare(drv_data->ssp->clk);
1330 return 0;
1331 }
1332
1333 static int pxa2xx_spi_runtime_resume(struct device *dev)
1334 {
1335 struct driver_data *drv_data = dev_get_drvdata(dev);
1336
1337 clk_prepare_enable(drv_data->ssp->clk);
1338 return 0;
1339 }
1340 #endif
1341
1342 static const struct dev_pm_ops pxa2xx_spi_pm_ops = {
1343 SET_SYSTEM_SLEEP_PM_OPS(pxa2xx_spi_suspend, pxa2xx_spi_resume)
1344 SET_RUNTIME_PM_OPS(pxa2xx_spi_runtime_suspend,
1345 pxa2xx_spi_runtime_resume, NULL)
1346 };
1347
1348 static struct platform_driver driver = {
1349 .driver = {
1350 .name = "pxa2xx-spi",
1351 .owner = THIS_MODULE,
1352 .pm = &pxa2xx_spi_pm_ops,
1353 .acpi_match_table = ACPI_PTR(pxa2xx_spi_acpi_match),
1354 },
1355 .probe = pxa2xx_spi_probe,
1356 .remove = pxa2xx_spi_remove,
1357 .shutdown = pxa2xx_spi_shutdown,
1358 };
1359
1360 static int __init pxa2xx_spi_init(void)
1361 {
1362 return platform_driver_register(&driver);
1363 }
1364 subsys_initcall(pxa2xx_spi_init);
1365
1366 static void __exit pxa2xx_spi_exit(void)
1367 {
1368 platform_driver_unregister(&driver);
1369 }
1370 module_exit(pxa2xx_spi_exit);
Linux with added FPC-III support