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path: root/drivers/spi/pxa2xx_spi.c
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-rw-r--r--drivers/spi/pxa2xx_spi.c1486
1 files changed, 1486 insertions, 0 deletions
diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
new file mode 100644
index 000000000000..29aec77f98be
--- /dev/null
+++ b/drivers/spi/pxa2xx_spi.c
@@ -0,0 +1,1486 @@
1/*
2 * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19#include <linux/init.h>
20#include <linux/module.h>
21#include <linux/device.h>
22#include <linux/ioport.h>
23#include <linux/errno.h>
24#include <linux/interrupt.h>
25#include <linux/platform_device.h>
26#include <linux/dma-mapping.h>
27#include <linux/spi/spi.h>
28#include <linux/workqueue.h>
29#include <linux/errno.h>
30#include <linux/delay.h>
31
32#include <asm/io.h>
33#include <asm/irq.h>
34#include <asm/hardware.h>
35#include <asm/delay.h>
36#include <asm/dma.h>
37
38#include <asm/arch/hardware.h>
39#include <asm/arch/pxa-regs.h>
40#include <asm/arch/pxa2xx_spi.h>
41
42MODULE_AUTHOR("Stephen Street");
43MODULE_DESCRIPTION("PXA2xx SSP SPI Contoller");
44MODULE_LICENSE("GPL");
45
46#define MAX_BUSES 3
47
48#define DMA_INT_MASK (DCSR_ENDINTR | DCSR_STARTINTR | DCSR_BUSERR)
49#define RESET_DMA_CHANNEL (DCSR_NODESC | DMA_INT_MASK)
50#define IS_DMA_ALIGNED(x) (((u32)(x)&0x07)==0)
51
52#define DEFINE_SSP_REG(reg, off) \
53static inline u32 read_##reg(void *p) { return __raw_readl(p + (off)); } \
54static inline void write_##reg(u32 v, void *p) { __raw_writel(v, p + (off)); }
55
56DEFINE_SSP_REG(SSCR0, 0x00)
57DEFINE_SSP_REG(SSCR1, 0x04)
58DEFINE_SSP_REG(SSSR, 0x08)
59DEFINE_SSP_REG(SSITR, 0x0c)
60DEFINE_SSP_REG(SSDR, 0x10)
61DEFINE_SSP_REG(SSTO, 0x28)
62DEFINE_SSP_REG(SSPSP, 0x2c)
63
64#define START_STATE ((void*)0)
65#define RUNNING_STATE ((void*)1)
66#define DONE_STATE ((void*)2)
67#define ERROR_STATE ((void*)-1)
68
69#define QUEUE_RUNNING 0
70#define QUEUE_STOPPED 1
71
72struct driver_data {
73 /* Driver model hookup */
74 struct platform_device *pdev;
75
76 /* SPI framework hookup */
77 enum pxa_ssp_type ssp_type;
78 struct spi_master *master;
79
80 /* PXA hookup */
81 struct pxa2xx_spi_master *master_info;
82
83 /* DMA setup stuff */
84 int rx_channel;
85 int tx_channel;
86 u32 *null_dma_buf;
87
88 /* SSP register addresses */
89 void *ioaddr;
90 u32 ssdr_physical;
91
92 /* SSP masks*/
93 u32 dma_cr1;
94 u32 int_cr1;
95 u32 clear_sr;
96 u32 mask_sr;
97
98 /* Driver message queue */
99 struct workqueue_struct *workqueue;
100 struct work_struct pump_messages;
101 spinlock_t lock;
102 struct list_head queue;
103 int busy;
104 int run;
105
106 /* Message Transfer pump */
107 struct tasklet_struct pump_transfers;
108
109 /* Current message transfer state info */
110 struct spi_message* cur_msg;
111 struct spi_transfer* cur_transfer;
112 struct chip_data *cur_chip;
113 size_t len;
114 void *tx;
115 void *tx_end;
116 void *rx;
117 void *rx_end;
118 int dma_mapped;
119 dma_addr_t rx_dma;
120 dma_addr_t tx_dma;
121 size_t rx_map_len;
122 size_t tx_map_len;
123 u8 n_bytes;
124 u32 dma_width;
125 int cs_change;
126 void (*write)(struct driver_data *drv_data);
127 void (*read)(struct driver_data *drv_data);
128 irqreturn_t (*transfer_handler)(struct driver_data *drv_data);
129 void (*cs_control)(u32 command);
130};
131
132struct chip_data {
133 u32 cr0;
134 u32 cr1;
135 u32 to;
136 u32 psp;
137 u32 timeout;
138 u8 n_bytes;
139 u32 dma_width;
140 u32 dma_burst_size;
141 u32 threshold;
142 u32 dma_threshold;
143 u8 enable_dma;
144 u8 bits_per_word;
145 u32 speed_hz;
146 void (*write)(struct driver_data *drv_data);
147 void (*read)(struct driver_data *drv_data);
148 void (*cs_control)(u32 command);
149};
150
151static void pump_messages(void *data);
152
153static int flush(struct driver_data *drv_data)
154{
155 unsigned long limit = loops_per_jiffy << 1;
156
157 void *reg = drv_data->ioaddr;
158
159 do {
160 while (read_SSSR(reg) & SSSR_RNE) {
161 read_SSDR(reg);
162 }
163 } while ((read_SSSR(reg) & SSSR_BSY) && limit--);
164 write_SSSR(SSSR_ROR, reg);
165
166 return limit;
167}
168
169static void restore_state(struct driver_data *drv_data)
170{
171 void *reg = drv_data->ioaddr;
172
173 /* Clear status and disable clock */
174 write_SSSR(drv_data->clear_sr, reg);
175 write_SSCR0(drv_data->cur_chip->cr0 & ~SSCR0_SSE, reg);
176
177 /* Load the registers */
178 write_SSCR1(drv_data->cur_chip->cr1, reg);
179 write_SSCR0(drv_data->cur_chip->cr0, reg);
180 if (drv_data->ssp_type != PXA25x_SSP) {
181 write_SSTO(0, reg);
182 write_SSPSP(drv_data->cur_chip->psp, reg);
183 }
184}
185
186static void null_cs_control(u32 command)
187{
188}
189
190static void null_writer(struct driver_data *drv_data)
191{
192 void *reg = drv_data->ioaddr;
193 u8 n_bytes = drv_data->n_bytes;
194
195 while ((read_SSSR(reg) & SSSR_TNF)
196 && (drv_data->tx < drv_data->tx_end)) {
197 write_SSDR(0, reg);
198 drv_data->tx += n_bytes;
199 }
200}
201
202static void null_reader(struct driver_data *drv_data)
203{
204 void *reg = drv_data->ioaddr;
205 u8 n_bytes = drv_data->n_bytes;
206
207 while ((read_SSSR(reg) & SSSR_RNE)
208 && (drv_data->rx < drv_data->rx_end)) {
209 read_SSDR(reg);
210 drv_data->rx += n_bytes;
211 }
212}
213
214static void u8_writer(struct driver_data *drv_data)
215{
216 void *reg = drv_data->ioaddr;
217
218 while ((read_SSSR(reg) & SSSR_TNF)
219 && (drv_data->tx < drv_data->tx_end)) {
220 write_SSDR(*(u8 *)(drv_data->tx), reg);
221 ++drv_data->tx;
222 }
223}
224
225static void u8_reader(struct driver_data *drv_data)
226{
227 void *reg = drv_data->ioaddr;
228
229 while ((read_SSSR(reg) & SSSR_RNE)
230 && (drv_data->rx < drv_data->rx_end)) {
231 *(u8 *)(drv_data->rx) = read_SSDR(reg);
232 ++drv_data->rx;
233 }
234}
235
236static void u16_writer(struct driver_data *drv_data)
237{
238 void *reg = drv_data->ioaddr;
239
240 while ((read_SSSR(reg) & SSSR_TNF)
241 && (drv_data->tx < drv_data->tx_end)) {
242 write_SSDR(*(u16 *)(drv_data->tx), reg);
243 drv_data->tx += 2;
244 }
245}
246
247static void u16_reader(struct driver_data *drv_data)
248{
249 void *reg = drv_data->ioaddr;
250
251 while ((read_SSSR(reg) & SSSR_RNE)
252 && (drv_data->rx < drv_data->rx_end)) {
253 *(u16 *)(drv_data->rx) = read_SSDR(reg);
254 drv_data->rx += 2;
255 }
256}
257static void u32_writer(struct driver_data *drv_data)
258{
259 void *reg = drv_data->ioaddr;
260
261 while ((read_SSSR(reg) & SSSR_TNF)
262 && (drv_data->tx < drv_data->tx_end)) {
263 write_SSDR(*(u32 *)(drv_data->tx), reg);
264 drv_data->tx += 4;
265 }
266}
267
268static void u32_reader(struct driver_data *drv_data)
269{
270 void *reg = drv_data->ioaddr;
271
272 while ((read_SSSR(reg) & SSSR_RNE)
273 && (drv_data->rx < drv_data->rx_end)) {
274 *(u32 *)(drv_data->rx) = read_SSDR(reg);
275 drv_data->rx += 4;
276 }
277}
278
279static void *next_transfer(struct driver_data *drv_data)
280{
281 struct spi_message *msg = drv_data->cur_msg;
282 struct spi_transfer *trans = drv_data->cur_transfer;
283
284 /* Move to next transfer */
285 if (trans->transfer_list.next != &msg->transfers) {
286 drv_data->cur_transfer =
287 list_entry(trans->transfer_list.next,
288 struct spi_transfer,
289 transfer_list);
290 return RUNNING_STATE;
291 } else
292 return DONE_STATE;
293}
294
295static int map_dma_buffers(struct driver_data *drv_data)
296{
297 struct spi_message *msg = drv_data->cur_msg;
298 struct device *dev = &msg->spi->dev;
299
300 if (!drv_data->cur_chip->enable_dma)
301 return 0;
302
303 if (msg->is_dma_mapped)
304 return drv_data->rx_dma && drv_data->tx_dma;
305
306 if (!IS_DMA_ALIGNED(drv_data->rx) || !IS_DMA_ALIGNED(drv_data->tx))
307 return 0;
308
309 /* Modify setup if rx buffer is null */
310 if (drv_data->rx == NULL) {
311 *drv_data->null_dma_buf = 0;
312 drv_data->rx = drv_data->null_dma_buf;
313 drv_data->rx_map_len = 4;
314 } else
315 drv_data->rx_map_len = drv_data->len;
316
317
318 /* Modify setup if tx buffer is null */
319 if (drv_data->tx == NULL) {
320 *drv_data->null_dma_buf = 0;
321 drv_data->tx = drv_data->null_dma_buf;
322 drv_data->tx_map_len = 4;
323 } else
324 drv_data->tx_map_len = drv_data->len;
325
326 /* Stream map the rx buffer */
327 drv_data->rx_dma = dma_map_single(dev, drv_data->rx,
328 drv_data->rx_map_len,
329 DMA_FROM_DEVICE);
330 if (dma_mapping_error(drv_data->rx_dma))
331 return 0;
332
333 /* Stream map the tx buffer */
334 drv_data->tx_dma = dma_map_single(dev, drv_data->tx,
335 drv_data->tx_map_len,
336 DMA_TO_DEVICE);
337
338 if (dma_mapping_error(drv_data->tx_dma)) {
339 dma_unmap_single(dev, drv_data->rx_dma,
340 drv_data->rx_map_len, DMA_FROM_DEVICE);
341 return 0;
342 }
343
344 return 1;
345}
346
347static void unmap_dma_buffers(struct driver_data *drv_data)
348{
349 struct device *dev;
350
351 if (!drv_data->dma_mapped)
352 return;
353
354 if (!drv_data->cur_msg->is_dma_mapped) {
355 dev = &drv_data->cur_msg->spi->dev;
356 dma_unmap_single(dev, drv_data->rx_dma,
357 drv_data->rx_map_len, DMA_FROM_DEVICE);
358 dma_unmap_single(dev, drv_data->tx_dma,
359 drv_data->tx_map_len, DMA_TO_DEVICE);
360 }
361
362 drv_data->dma_mapped = 0;
363}
364
365/* caller already set message->status; dma and pio irqs are blocked */
366static void giveback(struct driver_data *drv_data)
367{
368 struct spi_transfer* last_transfer;
369 unsigned long flags;
370 struct spi_message *msg;
371
372 spin_lock_irqsave(&drv_data->lock, flags);
373 msg = drv_data->cur_msg;
374 drv_data->cur_msg = NULL;
375 drv_data->cur_transfer = NULL;
376 drv_data->cur_chip = NULL;
377 queue_work(drv_data->workqueue, &drv_data->pump_messages);
378 spin_unlock_irqrestore(&drv_data->lock, flags);
379
380 last_transfer = list_entry(msg->transfers.prev,
381 struct spi_transfer,
382 transfer_list);
383
384 if (!last_transfer->cs_change)
385 drv_data->cs_control(PXA2XX_CS_DEASSERT);
386
387 msg->state = NULL;
388 if (msg->complete)
389 msg->complete(msg->context);
390}
391
392static int wait_ssp_rx_stall(void *ioaddr)
393{
394 unsigned long limit = loops_per_jiffy << 1;
395
396 while ((read_SSSR(ioaddr) & SSSR_BSY) && limit--)
397 cpu_relax();
398
399 return limit;
400}
401
402static int wait_dma_channel_stop(int channel)
403{
404 unsigned long limit = loops_per_jiffy << 1;
405
406 while (!(DCSR(channel) & DCSR_STOPSTATE) && limit--)
407 cpu_relax();
408
409 return limit;
410}
411
412static void dma_handler(int channel, void *data, struct pt_regs *regs)
413{
414 struct driver_data *drv_data = data;
415 struct spi_message *msg = drv_data->cur_msg;
416 void *reg = drv_data->ioaddr;
417 u32 irq_status = DCSR(channel) & DMA_INT_MASK;
418 u32 trailing_sssr = 0;
419
420 if (irq_status & DCSR_BUSERR) {
421
422 /* Disable interrupts, clear status and reset DMA */
423 write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
424 write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
425 if (drv_data->ssp_type != PXA25x_SSP)
426 write_SSTO(0, reg);
427 write_SSSR(drv_data->clear_sr, reg);
428 DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
429 DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
430
431 if (flush(drv_data) == 0)
432 dev_err(&drv_data->pdev->dev,
433 "dma_handler: flush fail\n");
434
435 unmap_dma_buffers(drv_data);
436
437 if (channel == drv_data->tx_channel)
438 dev_err(&drv_data->pdev->dev,
439 "dma_handler: bad bus address on "
440 "tx channel %d, source %x target = %x\n",
441 channel, DSADR(channel), DTADR(channel));
442 else
443 dev_err(&drv_data->pdev->dev,
444 "dma_handler: bad bus address on "
445 "rx channel %d, source %x target = %x\n",
446 channel, DSADR(channel), DTADR(channel));
447
448 msg->state = ERROR_STATE;
449 tasklet_schedule(&drv_data->pump_transfers);
450 }
451
452 /* PXA255x_SSP has no timeout interrupt, wait for tailing bytes */
453 if ((drv_data->ssp_type == PXA25x_SSP)
454 && (channel == drv_data->tx_channel)
455 && (irq_status & DCSR_ENDINTR)) {
456
457 /* Wait for rx to stall */
458 if (wait_ssp_rx_stall(drv_data->ioaddr) == 0)
459 dev_err(&drv_data->pdev->dev,
460 "dma_handler: ssp rx stall failed\n");
461
462 /* Clear and disable interrupts on SSP and DMA channels*/
463 write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
464 write_SSSR(drv_data->clear_sr, reg);
465 DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
466 DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
467 if (wait_dma_channel_stop(drv_data->rx_channel) == 0)
468 dev_err(&drv_data->pdev->dev,
469 "dma_handler: dma rx channel stop failed\n");
470
471 unmap_dma_buffers(drv_data);
472
473 /* Read trailing bytes */
474 /* Calculate number of trailing bytes, read them */
475 trailing_sssr = read_SSSR(reg);
476 if ((trailing_sssr & 0xf008) != 0xf000) {
477 drv_data->rx = drv_data->rx_end -
478 (((trailing_sssr >> 12) & 0x0f) + 1);
479 drv_data->read(drv_data);
480 }
481 msg->actual_length += drv_data->len;
482
483 /* Release chip select if requested, transfer delays are
484 * handled in pump_transfers */
485 if (drv_data->cs_change)
486 drv_data->cs_control(PXA2XX_CS_DEASSERT);
487
488 /* Move to next transfer */
489 msg->state = next_transfer(drv_data);
490
491 /* Schedule transfer tasklet */
492 tasklet_schedule(&drv_data->pump_transfers);
493 }
494}
495
496static irqreturn_t dma_transfer(struct driver_data *drv_data)
497{
498 u32 irq_status;
499 u32 trailing_sssr = 0;
500 struct spi_message *msg = drv_data->cur_msg;
501 void *reg = drv_data->ioaddr;
502
503 irq_status = read_SSSR(reg) & drv_data->mask_sr;
504 if (irq_status & SSSR_ROR) {
505 /* Clear and disable interrupts on SSP and DMA channels*/
506 write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
507 write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
508 if (drv_data->ssp_type != PXA25x_SSP)
509 write_SSTO(0, reg);
510 write_SSSR(drv_data->clear_sr, reg);
511 DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
512 DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
513 unmap_dma_buffers(drv_data);
514
515 if (flush(drv_data) == 0)
516 dev_err(&drv_data->pdev->dev,
517 "dma_transfer: flush fail\n");
518
519 dev_warn(&drv_data->pdev->dev, "dma_transfer: fifo overun\n");
520
521 drv_data->cur_msg->state = ERROR_STATE;
522 tasklet_schedule(&drv_data->pump_transfers);
523
524 return IRQ_HANDLED;
525 }
526
527 /* Check for false positive timeout */
528 if ((irq_status & SSSR_TINT) && DCSR(drv_data->tx_channel) & DCSR_RUN) {
529 write_SSSR(SSSR_TINT, reg);
530 return IRQ_HANDLED;
531 }
532
533 if (irq_status & SSSR_TINT || drv_data->rx == drv_data->rx_end) {
534
535 /* Clear and disable interrupts on SSP and DMA channels*/
536 write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
537 if (drv_data->ssp_type != PXA25x_SSP)
538 write_SSTO(0, reg);
539 write_SSSR(drv_data->clear_sr, reg);
540 DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
541 DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
542
543 if (wait_dma_channel_stop(drv_data->rx_channel) == 0)
544 dev_err(&drv_data->pdev->dev,
545 "dma_transfer: dma rx channel stop failed\n");
546
547 if (wait_ssp_rx_stall(drv_data->ioaddr) == 0)
548 dev_err(&drv_data->pdev->dev,
549 "dma_transfer: ssp rx stall failed\n");
550
551 unmap_dma_buffers(drv_data);
552
553 /* Calculate number of trailing bytes, read them */
554 trailing_sssr = read_SSSR(reg);
555 if ((trailing_sssr & 0xf008) != 0xf000) {
556 drv_data->rx = drv_data->rx_end -
557 (((trailing_sssr >> 12) & 0x0f) + 1);
558 drv_data->read(drv_data);
559 }
560 msg->actual_length += drv_data->len;
561
562 /* Release chip select if requested, transfer delays are
563 * handled in pump_transfers */
564 if (drv_data->cs_change)
565 drv_data->cs_control(PXA2XX_CS_DEASSERT);
566
567 /* Move to next transfer */
568 msg->state = next_transfer(drv_data);
569
570 /* Schedule transfer tasklet */
571 tasklet_schedule(&drv_data->pump_transfers);
572
573 return IRQ_HANDLED;
574 }
575
576 /* Opps problem detected */
577 return IRQ_NONE;
578}
579
580static irqreturn_t interrupt_transfer(struct driver_data *drv_data)
581{
582 struct spi_message *msg = drv_data->cur_msg;
583 void *reg = drv_data->ioaddr;
584 unsigned long limit = loops_per_jiffy << 1;
585 u32 irq_status;
586 u32 irq_mask = (read_SSCR1(reg) & SSCR1_TIE) ?
587 drv_data->mask_sr : drv_data->mask_sr & ~SSSR_TFS;
588
589 while ((irq_status = read_SSSR(reg) & irq_mask)) {
590
591 if (irq_status & SSSR_ROR) {
592
593 /* Clear and disable interrupts */
594 write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
595 write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg);
596 if (drv_data->ssp_type != PXA25x_SSP)
597 write_SSTO(0, reg);
598 write_SSSR(drv_data->clear_sr, reg);
599
600 if (flush(drv_data) == 0)
601 dev_err(&drv_data->pdev->dev,
602 "interrupt_transfer: flush fail\n");
603
604 /* Stop the SSP */
605
606 dev_warn(&drv_data->pdev->dev,
607 "interrupt_transfer: fifo overun\n");
608
609 msg->state = ERROR_STATE;
610 tasklet_schedule(&drv_data->pump_transfers);
611
612 return IRQ_HANDLED;
613 }
614
615 /* Look for false positive timeout */
616 if ((irq_status & SSSR_TINT)
617 && (drv_data->rx < drv_data->rx_end))
618 write_SSSR(SSSR_TINT, reg);
619
620 /* Pump data */
621 drv_data->read(drv_data);
622 drv_data->write(drv_data);
623
624 if (drv_data->tx == drv_data->tx_end) {
625 /* Disable tx interrupt */
626 write_SSCR1(read_SSCR1(reg) & ~SSCR1_TIE, reg);
627 irq_mask = drv_data->mask_sr & ~SSSR_TFS;
628
629 /* PXA25x_SSP has no timeout, read trailing bytes */
630 if (drv_data->ssp_type == PXA25x_SSP) {
631 while ((read_SSSR(reg) & SSSR_BSY) && limit--)
632 drv_data->read(drv_data);
633
634 if (limit == 0)
635 dev_err(&drv_data->pdev->dev,
636 "interrupt_transfer: "
637 "trailing byte read failed\n");
638 }
639 }
640
641 if ((irq_status & SSSR_TINT)
642 || (drv_data->rx == drv_data->rx_end)) {
643
644 /* Clear timeout */
645 write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg);
646 if (drv_data->ssp_type != PXA25x_SSP)
647 write_SSTO(0, reg);
648 write_SSSR(drv_data->clear_sr, reg);
649
650 /* Update total byte transfered */
651 msg->actual_length += drv_data->len;
652
653 /* Release chip select if requested, transfer delays are
654 * handled in pump_transfers */
655 if (drv_data->cs_change)
656 drv_data->cs_control(PXA2XX_CS_DEASSERT);
657
658 /* Move to next transfer */
659 msg->state = next_transfer(drv_data);
660
661 /* Schedule transfer tasklet */
662 tasklet_schedule(&drv_data->pump_transfers);
663 }
664 }
665
666 /* We did something */
667 return IRQ_HANDLED;
668}
669
670static irqreturn_t ssp_int(int irq, void *dev_id, struct pt_regs *regs)
671{
672 struct driver_data *drv_data = (struct driver_data *)dev_id;
673 void *reg = drv_data->ioaddr;
674
675 if (!drv_data->cur_msg) {
676
677 write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
678 write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg);
679 if (drv_data->ssp_type != PXA25x_SSP)
680 write_SSTO(0, reg);
681 write_SSSR(drv_data->clear_sr, reg);
682
683 dev_err(&drv_data->pdev->dev, "bad message state "
684 "in interrupt handler");
685
686 /* Never fail */
687 return IRQ_HANDLED;
688 }
689
690 return drv_data->transfer_handler(drv_data);
691}
692
693static void pump_transfers(unsigned long data)
694{
695 struct driver_data *drv_data = (struct driver_data *)data;
696 struct spi_message *message = NULL;
697 struct spi_transfer *transfer = NULL;
698 struct spi_transfer *previous = NULL;
699 struct chip_data *chip = NULL;
700 void *reg = drv_data->ioaddr;
701 u32 clk_div = 0;
702 u8 bits = 0;
703 u32 speed = 0;
704 u32 cr0;
705
706 /* Get current state information */
707 message = drv_data->cur_msg;
708 transfer = drv_data->cur_transfer;
709 chip = drv_data->cur_chip;
710
711 /* Handle for abort */
712 if (message->state == ERROR_STATE) {
713 message->status = -EIO;
714 giveback(drv_data);
715 return;
716 }
717
718 /* Handle end of message */
719 if (message->state == DONE_STATE) {
720 message->status = 0;
721 giveback(drv_data);
722 return;
723 }
724
725 /* Delay if requested at end of transfer*/
726 if (message->state == RUNNING_STATE) {
727 previous = list_entry(transfer->transfer_list.prev,
728 struct spi_transfer,
729 transfer_list);
730 if (previous->delay_usecs)
731 udelay(previous->delay_usecs);
732 }
733
734 /* Setup the transfer state based on the type of transfer */
735 if (flush(drv_data) == 0) {
736 dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n");
737 message->status = -EIO;
738 giveback(drv_data);
739 return;
740 }
741 drv_data->n_bytes = chip->n_bytes;
742 drv_data->dma_width = chip->dma_width;
743 drv_data->cs_control = chip->cs_control;
744 drv_data->tx = (void *)transfer->tx_buf;
745 drv_data->tx_end = drv_data->tx + transfer->len;
746 drv_data->rx = transfer->rx_buf;
747 drv_data->rx_end = drv_data->rx + transfer->len;
748 drv_data->rx_dma = transfer->rx_dma;
749 drv_data->tx_dma = transfer->tx_dma;
750 drv_data->len = transfer->len;
751 drv_data->write = drv_data->tx ? chip->write : null_writer;
752 drv_data->read = drv_data->rx ? chip->read : null_reader;
753 drv_data->cs_change = transfer->cs_change;
754
755 /* Change speed and bit per word on a per transfer */
756 if (transfer->speed_hz || transfer->bits_per_word) {
757
758 /* Disable clock */
759 write_SSCR0(chip->cr0 & ~SSCR0_SSE, reg);
760 cr0 = chip->cr0;
761 bits = chip->bits_per_word;
762 speed = chip->speed_hz;
763
764 if (transfer->speed_hz)
765 speed = transfer->speed_hz;
766
767 if (transfer->bits_per_word)
768 bits = transfer->bits_per_word;
769
770 if (reg == SSP1_VIRT)
771 clk_div = SSP1_SerClkDiv(speed);
772 else if (reg == SSP2_VIRT)
773 clk_div = SSP2_SerClkDiv(speed);
774 else if (reg == SSP3_VIRT)
775 clk_div = SSP3_SerClkDiv(speed);
776
777 if (bits <= 8) {
778 drv_data->n_bytes = 1;
779 drv_data->dma_width = DCMD_WIDTH1;
780 drv_data->read = drv_data->read != null_reader ?
781 u8_reader : null_reader;
782 drv_data->write = drv_data->write != null_writer ?
783 u8_writer : null_writer;
784 } else if (bits <= 16) {
785 drv_data->n_bytes = 2;
786 drv_data->dma_width = DCMD_WIDTH2;
787 drv_data->read = drv_data->read != null_reader ?
788 u16_reader : null_reader;
789 drv_data->write = drv_data->write != null_writer ?
790 u16_writer : null_writer;
791 } else if (bits <= 32) {
792 drv_data->n_bytes = 4;
793 drv_data->dma_width = DCMD_WIDTH4;
794 drv_data->read = drv_data->read != null_reader ?
795 u32_reader : null_reader;
796 drv_data->write = drv_data->write != null_writer ?
797 u32_writer : null_writer;
798 }
799
800 cr0 = clk_div
801 | SSCR0_Motorola
802 | SSCR0_DataSize(bits > 16 ? bits - 16 : bits)
803 | SSCR0_SSE
804 | (bits > 16 ? SSCR0_EDSS : 0);
805
806 /* Start it back up */
807 write_SSCR0(cr0, reg);
808 }
809
810 message->state = RUNNING_STATE;
811
812 /* Try to map dma buffer and do a dma transfer if successful */
813 if ((drv_data->dma_mapped = map_dma_buffers(drv_data))) {
814
815 /* Ensure we have the correct interrupt handler */
816 drv_data->transfer_handler = dma_transfer;
817
818 /* Setup rx DMA Channel */
819 DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
820 DSADR(drv_data->rx_channel) = drv_data->ssdr_physical;
821 DTADR(drv_data->rx_channel) = drv_data->rx_dma;
822 if (drv_data->rx == drv_data->null_dma_buf)
823 /* No target address increment */
824 DCMD(drv_data->rx_channel) = DCMD_FLOWSRC
825 | drv_data->dma_width
826 | chip->dma_burst_size
827 | drv_data->len;
828 else
829 DCMD(drv_data->rx_channel) = DCMD_INCTRGADDR
830 | DCMD_FLOWSRC
831 | drv_data->dma_width
832 | chip->dma_burst_size
833 | drv_data->len;
834
835 /* Setup tx DMA Channel */
836 DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
837 DSADR(drv_data->tx_channel) = drv_data->tx_dma;
838 DTADR(drv_data->tx_channel) = drv_data->ssdr_physical;
839 if (drv_data->tx == drv_data->null_dma_buf)
840 /* No source address increment */
841 DCMD(drv_data->tx_channel) = DCMD_FLOWTRG
842 | drv_data->dma_width
843 | chip->dma_burst_size
844 | drv_data->len;
845 else
846 DCMD(drv_data->tx_channel) = DCMD_INCSRCADDR
847 | DCMD_FLOWTRG
848 | drv_data->dma_width
849 | chip->dma_burst_size
850 | drv_data->len;
851
852 /* Enable dma end irqs on SSP to detect end of transfer */
853 if (drv_data->ssp_type == PXA25x_SSP)
854 DCMD(drv_data->tx_channel) |= DCMD_ENDIRQEN;
855
856 /* Fix me, need to handle cs polarity */
857 drv_data->cs_control(PXA2XX_CS_ASSERT);
858
859 /* Go baby, go */
860 write_SSSR(drv_data->clear_sr, reg);
861 DCSR(drv_data->rx_channel) |= DCSR_RUN;
862 DCSR(drv_data->tx_channel) |= DCSR_RUN;
863 if (drv_data->ssp_type != PXA25x_SSP)
864 write_SSTO(chip->timeout, reg);
865 write_SSCR1(chip->cr1
866 | chip->dma_threshold
867 | drv_data->dma_cr1,
868 reg);
869 } else {
870 /* Ensure we have the correct interrupt handler */
871 drv_data->transfer_handler = interrupt_transfer;
872
873 /* Fix me, need to handle cs polarity */
874 drv_data->cs_control(PXA2XX_CS_ASSERT);
875
876 /* Go baby, go */
877 write_SSSR(drv_data->clear_sr, reg);
878 if (drv_data->ssp_type != PXA25x_SSP)
879 write_SSTO(chip->timeout, reg);
880 write_SSCR1(chip->cr1
881 | chip->threshold
882 | drv_data->int_cr1,
883 reg);
884 }
885}
886
887static void pump_messages(void *data)
888{
889 struct driver_data *drv_data = data;
890 unsigned long flags;
891
892 /* Lock queue and check for queue work */
893 spin_lock_irqsave(&drv_data->lock, flags);
894 if (list_empty(&drv_data->queue) || drv_data->run == QUEUE_STOPPED) {
895 drv_data->busy = 0;
896 spin_unlock_irqrestore(&drv_data->lock, flags);
897 return;
898 }
899
900 /* Make sure we are not already running a message */
901 if (drv_data->cur_msg) {
902 spin_unlock_irqrestore(&drv_data->lock, flags);
903 return;
904 }
905
906 /* Extract head of queue */
907 drv_data->cur_msg = list_entry(drv_data->queue.next,
908 struct spi_message, queue);
909 list_del_init(&drv_data->cur_msg->queue);
910
911 /* Initial message state*/
912 drv_data->cur_msg->state = START_STATE;
913 drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next,
914 struct spi_transfer,
915 transfer_list);
916
917 /* Setup the SSP using the per chip configuration */
918 drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi);
919 restore_state(drv_data);
920
921 /* Mark as busy and launch transfers */
922 tasklet_schedule(&drv_data->pump_transfers);
923
924 drv_data->busy = 1;
925 spin_unlock_irqrestore(&drv_data->lock, flags);
926}
927
928static int transfer(struct spi_device *spi, struct spi_message *msg)
929{
930 struct driver_data *drv_data = spi_master_get_devdata(spi->master);
931 unsigned long flags;
932
933 spin_lock_irqsave(&drv_data->lock, flags);
934
935 if (drv_data->run == QUEUE_STOPPED) {
936 spin_unlock_irqrestore(&drv_data->lock, flags);
937 return -ESHUTDOWN;
938 }
939
940 msg->actual_length = 0;
941 msg->status = -EINPROGRESS;
942 msg->state = START_STATE;
943
944 list_add_tail(&msg->queue, &drv_data->queue);
945
946 if (drv_data->run == QUEUE_RUNNING && !drv_data->busy)
947 queue_work(drv_data->workqueue, &drv_data->pump_messages);
948
949 spin_unlock_irqrestore(&drv_data->lock, flags);
950
951 return 0;
952}
953
954static int setup(struct spi_device *spi)
955{
956 struct pxa2xx_spi_chip *chip_info = NULL;
957 struct chip_data *chip;
958 struct driver_data *drv_data = spi_master_get_devdata(spi->master);
959 unsigned int clk_div;
960
961 if (!spi->bits_per_word)
962 spi->bits_per_word = 8;
963
964 if (drv_data->ssp_type != PXA25x_SSP
965 && (spi->bits_per_word < 4 || spi->bits_per_word > 32))
966 return -EINVAL;
967 else if (spi->bits_per_word < 4 || spi->bits_per_word > 16)
968 return -EINVAL;
969
970 /* Only alloc (or use chip_info) on first setup */
971 chip = spi_get_ctldata(spi);
972 if (chip == NULL) {
973 chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
974 if (!chip)
975 return -ENOMEM;
976
977 chip->cs_control = null_cs_control;
978 chip->enable_dma = 0;
979 chip->timeout = SSP_TIMEOUT(1000);
980 chip->threshold = SSCR1_RxTresh(1) | SSCR1_TxTresh(1);
981 chip->dma_burst_size = drv_data->master_info->enable_dma ?
982 DCMD_BURST8 : 0;
983
984 chip_info = spi->controller_data;
985 }
986
987 /* chip_info isn't always needed */
988 if (chip_info) {
989 if (chip_info->cs_control)
990 chip->cs_control = chip_info->cs_control;
991
992 chip->timeout = SSP_TIMEOUT(chip_info->timeout_microsecs);
993
994 chip->threshold = SSCR1_RxTresh(chip_info->rx_threshold)
995 | SSCR1_TxTresh(chip_info->tx_threshold);
996
997 chip->enable_dma = chip_info->dma_burst_size != 0
998 && drv_data->master_info->enable_dma;
999 chip->dma_threshold = 0;
1000
1001 if (chip->enable_dma) {
1002 if (chip_info->dma_burst_size <= 8) {
1003 chip->dma_threshold = SSCR1_RxTresh(8)
1004 | SSCR1_TxTresh(8);
1005 chip->dma_burst_size = DCMD_BURST8;
1006 } else if (chip_info->dma_burst_size <= 16) {
1007 chip->dma_threshold = SSCR1_RxTresh(16)
1008 | SSCR1_TxTresh(16);
1009 chip->dma_burst_size = DCMD_BURST16;
1010 } else {
1011 chip->dma_threshold = SSCR1_RxTresh(32)
1012 | SSCR1_TxTresh(32);
1013 chip->dma_burst_size = DCMD_BURST32;
1014 }
1015 }
1016
1017
1018 if (chip_info->enable_loopback)
1019 chip->cr1 = SSCR1_LBM;
1020 }
1021
1022 if (drv_data->ioaddr == SSP1_VIRT)
1023 clk_div = SSP1_SerClkDiv(spi->max_speed_hz);
1024 else if (drv_data->ioaddr == SSP2_VIRT)
1025 clk_div = SSP2_SerClkDiv(spi->max_speed_hz);
1026 else if (drv_data->ioaddr == SSP3_VIRT)
1027 clk_div = SSP3_SerClkDiv(spi->max_speed_hz);
1028 else
1029 return -ENODEV;
1030 chip->speed_hz = spi->max_speed_hz;
1031
1032 chip->cr0 = clk_div
1033 | SSCR0_Motorola
1034 | SSCR0_DataSize(spi->bits_per_word > 16 ?
1035 spi->bits_per_word - 16 : spi->bits_per_word)
1036 | SSCR0_SSE
1037 | (spi->bits_per_word > 16 ? SSCR0_EDSS : 0);
1038 chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) << 4)
1039 | (((spi->mode & SPI_CPOL) != 0) << 3);
1040
1041 /* NOTE: PXA25x_SSP _could_ use external clocking ... */
1042 if (drv_data->ssp_type != PXA25x_SSP)
1043 dev_dbg(&spi->dev, "%d bits/word, %d Hz, mode %d\n",
1044 spi->bits_per_word,
1045 (CLOCK_SPEED_HZ)
1046 / (1 + ((chip->cr0 & SSCR0_SCR) >> 8)),
1047 spi->mode & 0x3);
1048 else
1049 dev_dbg(&spi->dev, "%d bits/word, %d Hz, mode %d\n",
1050 spi->bits_per_word,
1051 (CLOCK_SPEED_HZ/2)
1052 / (1 + ((chip->cr0 & SSCR0_SCR) >> 8)),
1053 spi->mode & 0x3);
1054
1055 if (spi->bits_per_word <= 8) {
1056 chip->n_bytes = 1;
1057 chip->dma_width = DCMD_WIDTH1;
1058 chip->read = u8_reader;
1059 chip->write = u8_writer;
1060 } else if (spi->bits_per_word <= 16) {
1061 chip->n_bytes = 2;
1062 chip->dma_width = DCMD_WIDTH2;
1063 chip->read = u16_reader;
1064 chip->write = u16_writer;
1065 } else if (spi->bits_per_word <= 32) {
1066 chip->cr0 |= SSCR0_EDSS;
1067 chip->n_bytes = 4;
1068 chip->dma_width = DCMD_WIDTH4;
1069 chip->read = u32_reader;
1070 chip->write = u32_writer;
1071 } else {
1072 dev_err(&spi->dev, "invalid wordsize\n");
1073 kfree(chip);
1074 return -ENODEV;
1075 }
1076 chip->bits_per_word = spi->bits_per_word;
1077
1078 spi_set_ctldata(spi, chip);
1079
1080 return 0;
1081}
1082
1083static void cleanup(const struct spi_device *spi)
1084{
1085 struct chip_data *chip = spi_get_ctldata((struct spi_device *)spi);
1086
1087 kfree(chip);
1088}
1089
1090static int init_queue(struct driver_data *drv_data)
1091{
1092 INIT_LIST_HEAD(&drv_data->queue);
1093 spin_lock_init(&drv_data->lock);
1094
1095 drv_data->run = QUEUE_STOPPED;
1096 drv_data->busy = 0;
1097
1098 tasklet_init(&drv_data->pump_transfers,
1099 pump_transfers, (unsigned long)drv_data);
1100
1101 INIT_WORK(&drv_data->pump_messages, pump_messages, drv_data);
1102 drv_data->workqueue = create_singlethread_workqueue(
1103 drv_data->master->cdev.dev->bus_id);
1104 if (drv_data->workqueue == NULL)
1105 return -EBUSY;
1106
1107 return 0;
1108}
1109
1110static int start_queue(struct driver_data *drv_data)
1111{
1112 unsigned long flags;
1113
1114 spin_lock_irqsave(&drv_data->lock, flags);
1115
1116 if (drv_data->run == QUEUE_RUNNING || drv_data->busy) {
1117 spin_unlock_irqrestore(&drv_data->lock, flags);
1118 return -EBUSY;
1119 }
1120
1121 drv_data->run = QUEUE_RUNNING;
1122 drv_data->cur_msg = NULL;
1123 drv_data->cur_transfer = NULL;
1124 drv_data->cur_chip = NULL;
1125 spin_unlock_irqrestore(&drv_data->lock, flags);
1126
1127 queue_work(drv_data->workqueue, &drv_data->pump_messages);
1128
1129 return 0;
1130}
1131
1132static int stop_queue(struct driver_data *drv_data)
1133{
1134 unsigned long flags;
1135 unsigned limit = 500;
1136 int status = 0;
1137
1138 spin_lock_irqsave(&drv_data->lock, flags);
1139
1140 /* This is a bit lame, but is optimized for the common execution path.
1141 * A wait_queue on the drv_data->busy could be used, but then the common
1142 * execution path (pump_messages) would be required to call wake_up or
1143 * friends on every SPI message. Do this instead */
1144 drv_data->run = QUEUE_STOPPED;
1145 while (!list_empty(&drv_data->queue) && drv_data->busy && limit--) {
1146 spin_unlock_irqrestore(&drv_data->lock, flags);
1147 msleep(10);
1148 spin_lock_irqsave(&drv_data->lock, flags);
1149 }
1150
1151 if (!list_empty(&drv_data->queue) || drv_data->busy)
1152 status = -EBUSY;
1153
1154 spin_unlock_irqrestore(&drv_data->lock, flags);
1155
1156 return status;
1157}
1158
1159static int destroy_queue(struct driver_data *drv_data)
1160{
1161 int status;
1162
1163 status = stop_queue(drv_data);
1164 if (status != 0)
1165 return status;
1166
1167 destroy_workqueue(drv_data->workqueue);
1168
1169 return 0;
1170}
1171
1172static int pxa2xx_spi_probe(struct platform_device *pdev)
1173{
1174 struct device *dev = &pdev->dev;
1175 struct pxa2xx_spi_master *platform_info;
1176 struct spi_master *master;
1177 struct driver_data *drv_data = 0;
1178 struct resource *memory_resource;
1179 int irq;
1180 int status = 0;
1181
1182 platform_info = dev->platform_data;
1183
1184 if (platform_info->ssp_type == SSP_UNDEFINED) {
1185 dev_err(&pdev->dev, "undefined SSP\n");
1186 return -ENODEV;
1187 }
1188
1189 /* Allocate master with space for drv_data and null dma buffer */
1190 master = spi_alloc_master(dev, sizeof(struct driver_data) + 16);
1191 if (!master) {
1192 dev_err(&pdev->dev, "can not alloc spi_master\n");
1193 return -ENOMEM;
1194 }
1195 drv_data = spi_master_get_devdata(master);
1196 drv_data->master = master;
1197 drv_data->master_info = platform_info;
1198 drv_data->pdev = pdev;
1199
1200 master->bus_num = pdev->id;
1201 master->num_chipselect = platform_info->num_chipselect;
1202 master->cleanup = cleanup;
1203 master->setup = setup;
1204 master->transfer = transfer;
1205
1206 drv_data->ssp_type = platform_info->ssp_type;
1207 drv_data->null_dma_buf = (u32 *)ALIGN((u32)(drv_data +
1208 sizeof(struct driver_data)), 8);
1209
1210 /* Setup register addresses */
1211 memory_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1212 if (!memory_resource) {
1213 dev_err(&pdev->dev, "memory resources not defined\n");
1214 status = -ENODEV;
1215 goto out_error_master_alloc;
1216 }
1217
1218 drv_data->ioaddr = (void *)io_p2v((unsigned long)(memory_resource->start));
1219 drv_data->ssdr_physical = memory_resource->start + 0x00000010;
1220 if (platform_info->ssp_type == PXA25x_SSP) {
1221 drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE;
1222 drv_data->dma_cr1 = 0;
1223 drv_data->clear_sr = SSSR_ROR;
1224 drv_data->mask_sr = SSSR_RFS | SSSR_TFS | SSSR_ROR;
1225 } else {
1226 drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE | SSCR1_TINTE;
1227 drv_data->dma_cr1 = SSCR1_TSRE | SSCR1_RSRE | SSCR1_TINTE;
1228 drv_data->clear_sr = SSSR_ROR | SSSR_TINT;
1229 drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR;
1230 }
1231
1232 /* Attach to IRQ */
1233 irq = platform_get_irq(pdev, 0);
1234 if (irq < 0) {
1235 dev_err(&pdev->dev, "irq resource not defined\n");
1236 status = -ENODEV;
1237 goto out_error_master_alloc;
1238 }
1239
1240 status = request_irq(irq, ssp_int, 0, dev->bus_id, drv_data);
1241 if (status < 0) {
1242 dev_err(&pdev->dev, "can not get IRQ\n");
1243 goto out_error_master_alloc;
1244 }
1245
1246 /* Setup DMA if requested */
1247 drv_data->tx_channel = -1;
1248 drv_data->rx_channel = -1;
1249 if (platform_info->enable_dma) {
1250
1251 /* Get two DMA channels (rx and tx) */
1252 drv_data->rx_channel = pxa_request_dma("pxa2xx_spi_ssp_rx",
1253 DMA_PRIO_HIGH,
1254 dma_handler,
1255 drv_data);
1256 if (drv_data->rx_channel < 0) {
1257 dev_err(dev, "problem (%d) requesting rx channel\n",
1258 drv_data->rx_channel);
1259 status = -ENODEV;
1260 goto out_error_irq_alloc;
1261 }
1262 drv_data->tx_channel = pxa_request_dma("pxa2xx_spi_ssp_tx",
1263 DMA_PRIO_MEDIUM,
1264 dma_handler,
1265 drv_data);
1266 if (drv_data->tx_channel < 0) {
1267 dev_err(dev, "problem (%d) requesting tx channel\n",
1268 drv_data->tx_channel);
1269 status = -ENODEV;
1270 goto out_error_dma_alloc;
1271 }
1272
1273 if (drv_data->ioaddr == SSP1_VIRT) {
1274 DRCMRRXSSDR = DRCMR_MAPVLD
1275 | drv_data->rx_channel;
1276 DRCMRTXSSDR = DRCMR_MAPVLD
1277 | drv_data->tx_channel;
1278 } else if (drv_data->ioaddr == SSP2_VIRT) {
1279 DRCMRRXSS2DR = DRCMR_MAPVLD
1280 | drv_data->rx_channel;
1281 DRCMRTXSS2DR = DRCMR_MAPVLD
1282 | drv_data->tx_channel;
1283 } else if (drv_data->ioaddr == SSP3_VIRT) {
1284 DRCMRRXSS3DR = DRCMR_MAPVLD
1285 | drv_data->rx_channel;
1286 DRCMRTXSS3DR = DRCMR_MAPVLD
1287 | drv_data->tx_channel;
1288 } else {
1289 dev_err(dev, "bad SSP type\n");
1290 goto out_error_dma_alloc;
1291 }
1292 }
1293
1294 /* Enable SOC clock */
1295 pxa_set_cken(platform_info->clock_enable, 1);
1296
1297 /* Load default SSP configuration */
1298 write_SSCR0(0, drv_data->ioaddr);
1299 write_SSCR1(SSCR1_RxTresh(4) | SSCR1_TxTresh(12), drv_data->ioaddr);
1300 write_SSCR0(SSCR0_SerClkDiv(2)
1301 | SSCR0_Motorola
1302 | SSCR0_DataSize(8),
1303 drv_data->ioaddr);
1304 if (drv_data->ssp_type != PXA25x_SSP)
1305 write_SSTO(0, drv_data->ioaddr);
1306 write_SSPSP(0, drv_data->ioaddr);
1307
1308 /* Initial and start queue */
1309 status = init_queue(drv_data);
1310 if (status != 0) {
1311 dev_err(&pdev->dev, "problem initializing queue\n");
1312 goto out_error_clock_enabled;
1313 }
1314 status = start_queue(drv_data);
1315 if (status != 0) {
1316 dev_err(&pdev->dev, "problem starting queue\n");
1317 goto out_error_clock_enabled;
1318 }
1319
1320 /* Register with the SPI framework */
1321 platform_set_drvdata(pdev, drv_data);
1322 status = spi_register_master(master);
1323 if (status != 0) {
1324 dev_err(&pdev->dev, "problem registering spi master\n");
1325 goto out_error_queue_alloc;
1326 }
1327
1328 return status;
1329
1330out_error_queue_alloc:
1331 destroy_queue(drv_data);
1332
1333out_error_clock_enabled:
1334 pxa_set_cken(platform_info->clock_enable, 0);
1335
1336out_error_dma_alloc:
1337 if (drv_data->tx_channel != -1)
1338 pxa_free_dma(drv_data->tx_channel);
1339 if (drv_data->rx_channel != -1)
1340 pxa_free_dma(drv_data->rx_channel);
1341
1342out_error_irq_alloc:
1343 free_irq(irq, drv_data);
1344
1345out_error_master_alloc:
1346 spi_master_put(master);
1347 return status;
1348}
1349
1350static int pxa2xx_spi_remove(struct platform_device *pdev)
1351{
1352 struct driver_data *drv_data = platform_get_drvdata(pdev);
1353 int irq;
1354 int status = 0;
1355
1356 if (!drv_data)
1357 return 0;
1358
1359 /* Remove the queue */
1360 status = destroy_queue(drv_data);
1361 if (status != 0)
1362 return status;
1363
1364 /* Disable the SSP at the peripheral and SOC level */
1365 write_SSCR0(0, drv_data->ioaddr);
1366 pxa_set_cken(drv_data->master_info->clock_enable, 0);
1367
1368 /* Release DMA */
1369 if (drv_data->master_info->enable_dma) {
1370 if (drv_data->ioaddr == SSP1_VIRT) {
1371 DRCMRRXSSDR = 0;
1372 DRCMRTXSSDR = 0;
1373 } else if (drv_data->ioaddr == SSP2_VIRT) {
1374 DRCMRRXSS2DR = 0;
1375 DRCMRTXSS2DR = 0;
1376 } else if (drv_data->ioaddr == SSP3_VIRT) {
1377 DRCMRRXSS3DR = 0;
1378 DRCMRTXSS3DR = 0;
1379 }
1380 pxa_free_dma(drv_data->tx_channel);
1381 pxa_free_dma(drv_data->rx_channel);
1382 }
1383
1384 /* Release IRQ */
1385 irq = platform_get_irq(pdev, 0);
1386 if (irq >= 0)
1387 free_irq(irq, drv_data);
1388
1389 /* Disconnect from the SPI framework */
1390 spi_unregister_master(drv_data->master);
1391
1392 /* Prevent double remove */
1393 platform_set_drvdata(pdev, NULL);
1394
1395 return 0;
1396}
1397
1398static void pxa2xx_spi_shutdown(struct platform_device *pdev)
1399{
1400 int status = 0;
1401
1402 if ((status = pxa2xx_spi_remove(pdev)) != 0)
1403 dev_err(&pdev->dev, "shutdown failed with %d\n", status);
1404}
1405
1406#ifdef CONFIG_PM
1407static int suspend_devices(struct device *dev, void *pm_message)
1408{
1409 pm_message_t *state = pm_message;
1410
1411 if (dev->power.power_state.event != state->event) {
1412 dev_warn(dev, "pm state does not match request\n");
1413 return -1;
1414 }
1415
1416 return 0;
1417}
1418
1419static int pxa2xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
1420{
1421 struct driver_data *drv_data = platform_get_drvdata(pdev);
1422 int status = 0;
1423
1424 /* Check all childern for current power state */
1425 if (device_for_each_child(&pdev->dev, &state, suspend_devices) != 0) {
1426 dev_warn(&pdev->dev, "suspend aborted\n");
1427 return -1;
1428 }
1429
1430 status = stop_queue(drv_data);
1431 if (status != 0)
1432 return status;
1433 write_SSCR0(0, drv_data->ioaddr);
1434 pxa_set_cken(drv_data->master_info->clock_enable, 0);
1435
1436 return 0;
1437}
1438
1439static int pxa2xx_spi_resume(struct platform_device *pdev)
1440{
1441 struct driver_data *drv_data = platform_get_drvdata(pdev);
1442 int status = 0;
1443
1444 /* Enable the SSP clock */
1445 pxa_set_cken(drv_data->master_info->clock_enable, 1);
1446
1447 /* Start the queue running */
1448 status = start_queue(drv_data);
1449 if (status != 0) {
1450 dev_err(&pdev->dev, "problem starting queue (%d)\n", status);
1451 return status;
1452 }
1453
1454 return 0;
1455}
1456#else
1457#define pxa2xx_spi_suspend NULL
1458#define pxa2xx_spi_resume NULL
1459#endif /* CONFIG_PM */
1460
1461static struct platform_driver driver = {
1462 .driver = {
1463 .name = "pxa2xx-spi",
1464 .bus = &platform_bus_type,
1465 .owner = THIS_MODULE,
1466 },
1467 .probe = pxa2xx_spi_probe,
1468 .remove = __devexit_p(pxa2xx_spi_remove),
1469 .shutdown = pxa2xx_spi_shutdown,
1470 .suspend = pxa2xx_spi_suspend,
1471 .resume = pxa2xx_spi_resume,
1472};
1473
1474static int __init pxa2xx_spi_init(void)
1475{
1476 platform_driver_register(&driver);
1477
1478 return 0;
1479}
1480module_init(pxa2xx_spi_init);
1481
1482static void __exit pxa2xx_spi_exit(void)
1483{
1484 platform_driver_unregister(&driver);
1485}
1486module_exit(pxa2xx_spi_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-07 17:17:39 -0500