1
2
3
4
5
6#include <linux/clk.h>
7#include <linux/delay.h>
8#include <linux/err.h>
9#include <linux/interrupt.h>
10#include <linux/io.h>
11#include <linux/list.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/of_device.h>
15#include <linux/platform_device.h>
16#include <linux/pm_runtime.h>
17#include <linux/spi/spi.h>
18#include <linux/dmaengine.h>
19#include <linux/dma-mapping.h>
20
21#define QUP_CONFIG 0x0000
22#define QUP_STATE 0x0004
23#define QUP_IO_M_MODES 0x0008
24#define QUP_SW_RESET 0x000c
25#define QUP_OPERATIONAL 0x0018
26#define QUP_ERROR_FLAGS 0x001c
27#define QUP_ERROR_FLAGS_EN 0x0020
28#define QUP_OPERATIONAL_MASK 0x0028
29#define QUP_HW_VERSION 0x0030
30#define QUP_MX_OUTPUT_CNT 0x0100
31#define QUP_OUTPUT_FIFO 0x0110
32#define QUP_MX_WRITE_CNT 0x0150
33#define QUP_MX_INPUT_CNT 0x0200
34#define QUP_MX_READ_CNT 0x0208
35#define QUP_INPUT_FIFO 0x0218
36
37#define SPI_CONFIG 0x0300
38#define SPI_IO_CONTROL 0x0304
39#define SPI_ERROR_FLAGS 0x0308
40#define SPI_ERROR_FLAGS_EN 0x030c
41
42
43#define QUP_CONFIG_SPI_MODE (1 << 8)
44#define QUP_CONFIG_CLOCK_AUTO_GATE BIT(13)
45#define QUP_CONFIG_NO_INPUT BIT(7)
46#define QUP_CONFIG_NO_OUTPUT BIT(6)
47#define QUP_CONFIG_N 0x001f
48
49
50#define QUP_STATE_VALID BIT(2)
51#define QUP_STATE_RESET 0
52#define QUP_STATE_RUN 1
53#define QUP_STATE_PAUSE 3
54#define QUP_STATE_MASK 3
55#define QUP_STATE_CLEAR 2
56
57#define QUP_HW_VERSION_2_1_1 0x20010001
58
59
60#define QUP_IO_M_PACK_EN BIT(15)
61#define QUP_IO_M_UNPACK_EN BIT(14)
62#define QUP_IO_M_INPUT_MODE_MASK_SHIFT 12
63#define QUP_IO_M_OUTPUT_MODE_MASK_SHIFT 10
64#define QUP_IO_M_INPUT_MODE_MASK (3 << QUP_IO_M_INPUT_MODE_MASK_SHIFT)
65#define QUP_IO_M_OUTPUT_MODE_MASK (3 << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT)
66
67#define QUP_IO_M_OUTPUT_BLOCK_SIZE(x) (((x) & (0x03 << 0)) >> 0)
68#define QUP_IO_M_OUTPUT_FIFO_SIZE(x) (((x) & (0x07 << 2)) >> 2)
69#define QUP_IO_M_INPUT_BLOCK_SIZE(x) (((x) & (0x03 << 5)) >> 5)
70#define QUP_IO_M_INPUT_FIFO_SIZE(x) (((x) & (0x07 << 7)) >> 7)
71
72#define QUP_IO_M_MODE_FIFO 0
73#define QUP_IO_M_MODE_BLOCK 1
74#define QUP_IO_M_MODE_DMOV 2
75#define QUP_IO_M_MODE_BAM 3
76
77
78#define QUP_OP_IN_BLOCK_READ_REQ BIT(13)
79#define QUP_OP_OUT_BLOCK_WRITE_REQ BIT(12)
80#define QUP_OP_MAX_INPUT_DONE_FLAG BIT(11)
81#define QUP_OP_MAX_OUTPUT_DONE_FLAG BIT(10)
82#define QUP_OP_IN_SERVICE_FLAG BIT(9)
83#define QUP_OP_OUT_SERVICE_FLAG BIT(8)
84#define QUP_OP_IN_FIFO_FULL BIT(7)
85#define QUP_OP_OUT_FIFO_FULL BIT(6)
86#define QUP_OP_IN_FIFO_NOT_EMPTY BIT(5)
87#define QUP_OP_OUT_FIFO_NOT_EMPTY BIT(4)
88
89
90#define QUP_ERROR_OUTPUT_OVER_RUN BIT(5)
91#define QUP_ERROR_INPUT_UNDER_RUN BIT(4)
92#define QUP_ERROR_OUTPUT_UNDER_RUN BIT(3)
93#define QUP_ERROR_INPUT_OVER_RUN BIT(2)
94
95
96#define SPI_CONFIG_HS_MODE BIT(10)
97#define SPI_CONFIG_INPUT_FIRST BIT(9)
98#define SPI_CONFIG_LOOPBACK BIT(8)
99
100
101#define SPI_IO_C_FORCE_CS BIT(11)
102#define SPI_IO_C_CLK_IDLE_HIGH BIT(10)
103#define SPI_IO_C_MX_CS_MODE BIT(8)
104#define SPI_IO_C_CS_N_POLARITY_0 BIT(4)
105#define SPI_IO_C_CS_SELECT(x) (((x) & 3) << 2)
106#define SPI_IO_C_CS_SELECT_MASK 0x000c
107#define SPI_IO_C_TRISTATE_CS BIT(1)
108#define SPI_IO_C_NO_TRI_STATE BIT(0)
109
110
111#define SPI_ERROR_CLK_OVER_RUN BIT(1)
112#define SPI_ERROR_CLK_UNDER_RUN BIT(0)
113
114#define SPI_NUM_CHIPSELECTS 4
115
116#define SPI_MAX_XFER (SZ_64K - 64)
117
118
119#define SPI_HS_MIN_RATE 26000000
120#define SPI_MAX_RATE 50000000
121
122#define SPI_DELAY_THRESHOLD 1
123#define SPI_DELAY_RETRY 10
124
125struct spi_qup {
126 void __iomem *base;
127 struct device *dev;
128 struct clk *cclk;
129 struct clk *iclk;
130 int irq;
131 spinlock_t lock;
132
133 int in_fifo_sz;
134 int out_fifo_sz;
135 int in_blk_sz;
136 int out_blk_sz;
137
138 struct spi_transfer *xfer;
139 struct completion done;
140 int error;
141 int w_size;
142 int n_words;
143 int tx_bytes;
144 int rx_bytes;
145 const u8 *tx_buf;
146 u8 *rx_buf;
147 int qup_v1;
148
149 int mode;
150 struct dma_slave_config rx_conf;
151 struct dma_slave_config tx_conf;
152};
153
154static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer);
155
156static inline bool spi_qup_is_flag_set(struct spi_qup *controller, u32 flag)
157{
158 u32 opflag = readl_relaxed(controller->base + QUP_OPERATIONAL);
159
160 return (opflag & flag) != 0;
161}
162
163static inline bool spi_qup_is_dma_xfer(int mode)
164{
165 if (mode == QUP_IO_M_MODE_DMOV || mode == QUP_IO_M_MODE_BAM)
166 return true;
167
168 return false;
169}
170
171
172static inline unsigned int spi_qup_len(struct spi_qup *controller)
173{
174 return controller->n_words * controller->w_size;
175}
176
177static inline bool spi_qup_is_valid_state(struct spi_qup *controller)
178{
179 u32 opstate = readl_relaxed(controller->base + QUP_STATE);
180
181 return opstate & QUP_STATE_VALID;
182}
183
184static int spi_qup_set_state(struct spi_qup *controller, u32 state)
185{
186 unsigned long loop;
187 u32 cur_state;
188
189 loop = 0;
190 while (!spi_qup_is_valid_state(controller)) {
191
192 usleep_range(SPI_DELAY_THRESHOLD, SPI_DELAY_THRESHOLD * 2);
193
194 if (++loop > SPI_DELAY_RETRY)
195 return -EIO;
196 }
197
198 if (loop)
199 dev_dbg(controller->dev, "invalid state for %ld,us %d\n",
200 loop, state);
201
202 cur_state = readl_relaxed(controller->base + QUP_STATE);
203
204
205
206
207 if (((cur_state & QUP_STATE_MASK) == QUP_STATE_PAUSE) &&
208 (state == QUP_STATE_RESET)) {
209 writel_relaxed(QUP_STATE_CLEAR, controller->base + QUP_STATE);
210 writel_relaxed(QUP_STATE_CLEAR, controller->base + QUP_STATE);
211 } else {
212 cur_state &= ~QUP_STATE_MASK;
213 cur_state |= state;
214 writel_relaxed(cur_state, controller->base + QUP_STATE);
215 }
216
217 loop = 0;
218 while (!spi_qup_is_valid_state(controller)) {
219
220 usleep_range(SPI_DELAY_THRESHOLD, SPI_DELAY_THRESHOLD * 2);
221
222 if (++loop > SPI_DELAY_RETRY)
223 return -EIO;
224 }
225
226 return 0;
227}
228
229static void spi_qup_read_from_fifo(struct spi_qup *controller, u32 num_words)
230{
231 u8 *rx_buf = controller->rx_buf;
232 int i, shift, num_bytes;
233 u32 word;
234
235 for (; num_words; num_words--) {
236
237 word = readl_relaxed(controller->base + QUP_INPUT_FIFO);
238
239 num_bytes = min_t(int, spi_qup_len(controller) -
240 controller->rx_bytes,
241 controller->w_size);
242
243 if (!rx_buf) {
244 controller->rx_bytes += num_bytes;
245 continue;
246 }
247
248 for (i = 0; i < num_bytes; i++, controller->rx_bytes++) {
249
250
251
252
253
254
255 shift = BITS_PER_BYTE;
256 shift *= (controller->w_size - i - 1);
257 rx_buf[controller->rx_bytes] = word >> shift;
258 }
259 }
260}
261
262static void spi_qup_read(struct spi_qup *controller, u32 *opflags)
263{
264 u32 remainder, words_per_block, num_words;
265 bool is_block_mode = controller->mode == QUP_IO_M_MODE_BLOCK;
266
267 remainder = DIV_ROUND_UP(spi_qup_len(controller) - controller->rx_bytes,
268 controller->w_size);
269 words_per_block = controller->in_blk_sz >> 2;
270
271 do {
272
273 writel_relaxed(QUP_OP_IN_SERVICE_FLAG,
274 controller->base + QUP_OPERATIONAL);
275
276 if (!remainder)
277 goto exit;
278
279 if (is_block_mode) {
280 num_words = (remainder > words_per_block) ?
281 words_per_block : remainder;
282 } else {
283 if (!spi_qup_is_flag_set(controller,
284 QUP_OP_IN_FIFO_NOT_EMPTY))
285 break;
286
287 num_words = 1;
288 }
289
290
291 spi_qup_read_from_fifo(controller, num_words);
292
293 remainder -= num_words;
294
295
296 if (is_block_mode && !spi_qup_is_flag_set(controller,
297 QUP_OP_IN_BLOCK_READ_REQ))
298 break;
299
300 } while (remainder);
301
302
303
304
305
306
307
308exit:
309 if (!remainder) {
310 *opflags = readl_relaxed(controller->base + QUP_OPERATIONAL);
311 if (is_block_mode && *opflags & QUP_OP_MAX_INPUT_DONE_FLAG)
312 writel_relaxed(QUP_OP_IN_SERVICE_FLAG,
313 controller->base + QUP_OPERATIONAL);
314 }
315}
316
317static void spi_qup_write_to_fifo(struct spi_qup *controller, u32 num_words)
318{
319 const u8 *tx_buf = controller->tx_buf;
320 int i, num_bytes;
321 u32 word, data;
322
323 for (; num_words; num_words--) {
324 word = 0;
325
326 num_bytes = min_t(int, spi_qup_len(controller) -
327 controller->tx_bytes,
328 controller->w_size);
329 if (tx_buf)
330 for (i = 0; i < num_bytes; i++) {
331 data = tx_buf[controller->tx_bytes + i];
332 word |= data << (BITS_PER_BYTE * (3 - i));
333 }
334
335 controller->tx_bytes += num_bytes;
336
337 writel_relaxed(word, controller->base + QUP_OUTPUT_FIFO);
338 }
339}
340
341static void spi_qup_dma_done(void *data)
342{
343 struct spi_qup *qup = data;
344
345 complete(&qup->done);
346}
347
348static void spi_qup_write(struct spi_qup *controller)
349{
350 bool is_block_mode = controller->mode == QUP_IO_M_MODE_BLOCK;
351 u32 remainder, words_per_block, num_words;
352
353 remainder = DIV_ROUND_UP(spi_qup_len(controller) - controller->tx_bytes,
354 controller->w_size);
355 words_per_block = controller->out_blk_sz >> 2;
356
357 do {
358
359 writel_relaxed(QUP_OP_OUT_SERVICE_FLAG,
360 controller->base + QUP_OPERATIONAL);
361
362
363 if (!remainder)
364 return;
365
366 if (is_block_mode) {
367 num_words = (remainder > words_per_block) ?
368 words_per_block : remainder;
369 } else {
370 if (spi_qup_is_flag_set(controller,
371 QUP_OP_OUT_FIFO_FULL))
372 break;
373
374 num_words = 1;
375 }
376
377 spi_qup_write_to_fifo(controller, num_words);
378
379 remainder -= num_words;
380
381
382 if (is_block_mode && !spi_qup_is_flag_set(controller,
383 QUP_OP_OUT_BLOCK_WRITE_REQ))
384 break;
385
386 } while (remainder);
387}
388
389static int spi_qup_prep_sg(struct spi_master *master, struct scatterlist *sgl,
390 unsigned int nents, enum dma_transfer_direction dir,
391 dma_async_tx_callback callback)
392{
393 struct spi_qup *qup = spi_master_get_devdata(master);
394 unsigned long flags = DMA_PREP_INTERRUPT | DMA_PREP_FENCE;
395 struct dma_async_tx_descriptor *desc;
396 struct dma_chan *chan;
397 dma_cookie_t cookie;
398
399 if (dir == DMA_MEM_TO_DEV)
400 chan = master->dma_tx;
401 else
402 chan = master->dma_rx;
403
404 desc = dmaengine_prep_slave_sg(chan, sgl, nents, dir, flags);
405 if (IS_ERR_OR_NULL(desc))
406 return desc ? PTR_ERR(desc) : -EINVAL;
407
408 desc->callback = callback;
409 desc->callback_param = qup;
410
411 cookie = dmaengine_submit(desc);
412
413 return dma_submit_error(cookie);
414}
415
416static void spi_qup_dma_terminate(struct spi_master *master,
417 struct spi_transfer *xfer)
418{
419 if (xfer->tx_buf)
420 dmaengine_terminate_all(master->dma_tx);
421 if (xfer->rx_buf)
422 dmaengine_terminate_all(master->dma_rx);
423}
424
425static u32 spi_qup_sgl_get_nents_len(struct scatterlist *sgl, u32 max,
426 u32 *nents)
427{
428 struct scatterlist *sg;
429 u32 total = 0;
430
431 for (sg = sgl; sg; sg = sg_next(sg)) {
432 unsigned int len = sg_dma_len(sg);
433
434
435 if (((total + len) < total) || ((total + len) > max))
436 break;
437
438 total += len;
439 (*nents)++;
440 }
441
442 return total;
443}
444
445static int spi_qup_do_dma(struct spi_device *spi, struct spi_transfer *xfer,
446 unsigned long timeout)
447{
448 dma_async_tx_callback rx_done = NULL, tx_done = NULL;
449 struct spi_master *master = spi->master;
450 struct spi_qup *qup = spi_master_get_devdata(master);
451 struct scatterlist *tx_sgl, *rx_sgl;
452 int ret;
453
454 if (xfer->rx_buf)
455 rx_done = spi_qup_dma_done;
456 else if (xfer->tx_buf)
457 tx_done = spi_qup_dma_done;
458
459 rx_sgl = xfer->rx_sg.sgl;
460 tx_sgl = xfer->tx_sg.sgl;
461
462 do {
463 u32 rx_nents = 0, tx_nents = 0;
464
465 if (rx_sgl)
466 qup->n_words = spi_qup_sgl_get_nents_len(rx_sgl,
467 SPI_MAX_XFER, &rx_nents) / qup->w_size;
468 if (tx_sgl)
469 qup->n_words = spi_qup_sgl_get_nents_len(tx_sgl,
470 SPI_MAX_XFER, &tx_nents) / qup->w_size;
471 if (!qup->n_words)
472 return -EIO;
473
474 ret = spi_qup_io_config(spi, xfer);
475 if (ret)
476 return ret;
477
478
479 ret = spi_qup_set_state(qup, QUP_STATE_RUN);
480 if (ret) {
481 dev_warn(qup->dev, "cannot set RUN state\n");
482 return ret;
483 }
484 if (rx_sgl) {
485 ret = spi_qup_prep_sg(master, rx_sgl, rx_nents,
486 DMA_DEV_TO_MEM, rx_done);
487 if (ret)
488 return ret;
489 dma_async_issue_pending(master->dma_rx);
490 }
491
492 if (tx_sgl) {
493 ret = spi_qup_prep_sg(master, tx_sgl, tx_nents,
494 DMA_MEM_TO_DEV, tx_done);
495 if (ret)
496 return ret;
497
498 dma_async_issue_pending(master->dma_tx);
499 }
500
501 if (!wait_for_completion_timeout(&qup->done, timeout))
502 return -ETIMEDOUT;
503
504 for (; rx_sgl && rx_nents--; rx_sgl = sg_next(rx_sgl))
505 ;
506 for (; tx_sgl && tx_nents--; tx_sgl = sg_next(tx_sgl))
507 ;
508
509 } while (rx_sgl || tx_sgl);
510
511 return 0;
512}
513
514static int spi_qup_do_pio(struct spi_device *spi, struct spi_transfer *xfer,
515 unsigned long timeout)
516{
517 struct spi_master *master = spi->master;
518 struct spi_qup *qup = spi_master_get_devdata(master);
519 int ret, n_words, iterations, offset = 0;
520
521 n_words = qup->n_words;
522 iterations = n_words / SPI_MAX_XFER;
523 qup->rx_buf = xfer->rx_buf;
524 qup->tx_buf = xfer->tx_buf;
525
526 do {
527 if (iterations)
528 qup->n_words = SPI_MAX_XFER;
529 else
530 qup->n_words = n_words % SPI_MAX_XFER;
531
532 if (qup->tx_buf && offset)
533 qup->tx_buf = xfer->tx_buf + offset * SPI_MAX_XFER;
534
535 if (qup->rx_buf && offset)
536 qup->rx_buf = xfer->rx_buf + offset * SPI_MAX_XFER;
537
538
539
540
541
542 if (qup->n_words <= (qup->in_fifo_sz / sizeof(u32)))
543 qup->mode = QUP_IO_M_MODE_FIFO;
544
545 ret = spi_qup_io_config(spi, xfer);
546 if (ret)
547 return ret;
548
549 ret = spi_qup_set_state(qup, QUP_STATE_RUN);
550 if (ret) {
551 dev_warn(qup->dev, "cannot set RUN state\n");
552 return ret;
553 }
554
555 ret = spi_qup_set_state(qup, QUP_STATE_PAUSE);
556 if (ret) {
557 dev_warn(qup->dev, "cannot set PAUSE state\n");
558 return ret;
559 }
560
561 if (qup->mode == QUP_IO_M_MODE_FIFO)
562 spi_qup_write(qup);
563
564 ret = spi_qup_set_state(qup, QUP_STATE_RUN);
565 if (ret) {
566 dev_warn(qup->dev, "cannot set RUN state\n");
567 return ret;
568 }
569
570 if (!wait_for_completion_timeout(&qup->done, timeout))
571 return -ETIMEDOUT;
572
573 offset++;
574 } while (iterations--);
575
576 return 0;
577}
578
579static bool spi_qup_data_pending(struct spi_qup *controller)
580{
581 unsigned int remainder_tx, remainder_rx;
582
583 remainder_tx = DIV_ROUND_UP(spi_qup_len(controller) -
584 controller->tx_bytes, controller->w_size);
585
586 remainder_rx = DIV_ROUND_UP(spi_qup_len(controller) -
587 controller->rx_bytes, controller->w_size);
588
589 return remainder_tx || remainder_rx;
590}
591
592static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
593{
594 struct spi_qup *controller = dev_id;
595 u32 opflags, qup_err, spi_err;
596 unsigned long flags;
597 int error = 0;
598
599 qup_err = readl_relaxed(controller->base + QUP_ERROR_FLAGS);
600 spi_err = readl_relaxed(controller->base + SPI_ERROR_FLAGS);
601 opflags = readl_relaxed(controller->base + QUP_OPERATIONAL);
602
603 writel_relaxed(qup_err, controller->base + QUP_ERROR_FLAGS);
604 writel_relaxed(spi_err, controller->base + SPI_ERROR_FLAGS);
605
606 if (qup_err) {
607 if (qup_err & QUP_ERROR_OUTPUT_OVER_RUN)
608 dev_warn(controller->dev, "OUTPUT_OVER_RUN\n");
609 if (qup_err & QUP_ERROR_INPUT_UNDER_RUN)
610 dev_warn(controller->dev, "INPUT_UNDER_RUN\n");
611 if (qup_err & QUP_ERROR_OUTPUT_UNDER_RUN)
612 dev_warn(controller->dev, "OUTPUT_UNDER_RUN\n");
613 if (qup_err & QUP_ERROR_INPUT_OVER_RUN)
614 dev_warn(controller->dev, "INPUT_OVER_RUN\n");
615
616 error = -EIO;
617 }
618
619 if (spi_err) {
620 if (spi_err & SPI_ERROR_CLK_OVER_RUN)
621 dev_warn(controller->dev, "CLK_OVER_RUN\n");
622 if (spi_err & SPI_ERROR_CLK_UNDER_RUN)
623 dev_warn(controller->dev, "CLK_UNDER_RUN\n");
624
625 error = -EIO;
626 }
627
628 spin_lock_irqsave(&controller->lock, flags);
629 if (!controller->error)
630 controller->error = error;
631 spin_unlock_irqrestore(&controller->lock, flags);
632
633 if (spi_qup_is_dma_xfer(controller->mode)) {
634 writel_relaxed(opflags, controller->base + QUP_OPERATIONAL);
635 } else {
636 if (opflags & QUP_OP_IN_SERVICE_FLAG)
637 spi_qup_read(controller, &opflags);
638
639 if (opflags & QUP_OP_OUT_SERVICE_FLAG)
640 spi_qup_write(controller);
641
642 if (!spi_qup_data_pending(controller))
643 complete(&controller->done);
644 }
645
646 if (error)
647 complete(&controller->done);
648
649 if (opflags & QUP_OP_MAX_INPUT_DONE_FLAG) {
650 if (!spi_qup_is_dma_xfer(controller->mode)) {
651 if (spi_qup_data_pending(controller))
652 return IRQ_HANDLED;
653 }
654 complete(&controller->done);
655 }
656
657 return IRQ_HANDLED;
658}
659
660
661static int spi_qup_io_prep(struct spi_device *spi, struct spi_transfer *xfer)
662{
663 struct spi_qup *controller = spi_master_get_devdata(spi->master);
664 int ret;
665
666 if (spi->mode & SPI_LOOP && xfer->len > controller->in_fifo_sz) {
667 dev_err(controller->dev, "too big size for loopback %d > %d\n",
668 xfer->len, controller->in_fifo_sz);
669 return -EIO;
670 }
671
672 ret = clk_set_rate(controller->cclk, xfer->speed_hz);
673 if (ret) {
674 dev_err(controller->dev, "fail to set frequency %d",
675 xfer->speed_hz);
676 return -EIO;
677 }
678
679 controller->w_size = DIV_ROUND_UP(xfer->bits_per_word, 8);
680 controller->n_words = xfer->len / controller->w_size;
681
682 if (controller->n_words <= (controller->in_fifo_sz / sizeof(u32)))
683 controller->mode = QUP_IO_M_MODE_FIFO;
684 else if (spi->master->can_dma &&
685 spi->master->can_dma(spi->master, spi, xfer) &&
686 spi->master->cur_msg_mapped)
687 controller->mode = QUP_IO_M_MODE_BAM;
688 else
689 controller->mode = QUP_IO_M_MODE_BLOCK;
690
691 return 0;
692}
693
694
695static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
696{
697 struct spi_qup *controller = spi_master_get_devdata(spi->master);
698 u32 config, iomode, control;
699 unsigned long flags;
700
701 spin_lock_irqsave(&controller->lock, flags);
702 controller->xfer = xfer;
703 controller->error = 0;
704 controller->rx_bytes = 0;
705 controller->tx_bytes = 0;
706 spin_unlock_irqrestore(&controller->lock, flags);
707
708
709 if (spi_qup_set_state(controller, QUP_STATE_RESET)) {
710 dev_err(controller->dev, "cannot set RESET state\n");
711 return -EIO;
712 }
713
714 switch (controller->mode) {
715 case QUP_IO_M_MODE_FIFO:
716 writel_relaxed(controller->n_words,
717 controller->base + QUP_MX_READ_CNT);
718 writel_relaxed(controller->n_words,
719 controller->base + QUP_MX_WRITE_CNT);
720
721 writel_relaxed(0, controller->base + QUP_MX_INPUT_CNT);
722 writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT);
723 break;
724 case QUP_IO_M_MODE_BAM:
725 writel_relaxed(controller->n_words,
726 controller->base + QUP_MX_INPUT_CNT);
727 writel_relaxed(controller->n_words,
728 controller->base + QUP_MX_OUTPUT_CNT);
729
730 writel_relaxed(0, controller->base + QUP_MX_READ_CNT);
731 writel_relaxed(0, controller->base + QUP_MX_WRITE_CNT);
732
733 if (!controller->qup_v1) {
734 void __iomem *input_cnt;
735
736 input_cnt = controller->base + QUP_MX_INPUT_CNT;
737
738
739
740
741
742
743 if (xfer->tx_buf)
744 writel_relaxed(0, input_cnt);
745 else
746 writel_relaxed(controller->n_words, input_cnt);
747
748 writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT);
749 }
750 break;
751 case QUP_IO_M_MODE_BLOCK:
752 reinit_completion(&controller->done);
753 writel_relaxed(controller->n_words,
754 controller->base + QUP_MX_INPUT_CNT);
755 writel_relaxed(controller->n_words,
756 controller->base + QUP_MX_OUTPUT_CNT);
757
758 writel_relaxed(0, controller->base + QUP_MX_READ_CNT);
759 writel_relaxed(0, controller->base + QUP_MX_WRITE_CNT);
760 break;
761 default:
762 dev_err(controller->dev, "unknown mode = %d\n",
763 controller->mode);
764 return -EIO;
765 }
766
767 iomode = readl_relaxed(controller->base + QUP_IO_M_MODES);
768
769 iomode &= ~(QUP_IO_M_INPUT_MODE_MASK | QUP_IO_M_OUTPUT_MODE_MASK);
770
771 if (!spi_qup_is_dma_xfer(controller->mode))
772 iomode &= ~(QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN);
773 else
774 iomode |= QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN;
775
776 iomode |= (controller->mode << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT);
777 iomode |= (controller->mode << QUP_IO_M_INPUT_MODE_MASK_SHIFT);
778
779 writel_relaxed(iomode, controller->base + QUP_IO_M_MODES);
780
781 control = readl_relaxed(controller->base + SPI_IO_CONTROL);
782
783 if (spi->mode & SPI_CPOL)
784 control |= SPI_IO_C_CLK_IDLE_HIGH;
785 else
786 control &= ~SPI_IO_C_CLK_IDLE_HIGH;
787
788 writel_relaxed(control, controller->base + SPI_IO_CONTROL);
789
790 config = readl_relaxed(controller->base + SPI_CONFIG);
791
792 if (spi->mode & SPI_LOOP)
793 config |= SPI_CONFIG_LOOPBACK;
794 else
795 config &= ~SPI_CONFIG_LOOPBACK;
796
797 if (spi->mode & SPI_CPHA)
798 config &= ~SPI_CONFIG_INPUT_FIRST;
799 else
800 config |= SPI_CONFIG_INPUT_FIRST;
801
802
803
804
805
806 if ((xfer->speed_hz >= SPI_HS_MIN_RATE) && !(spi->mode & SPI_LOOP))
807 config |= SPI_CONFIG_HS_MODE;
808 else
809 config &= ~SPI_CONFIG_HS_MODE;
810
811 writel_relaxed(config, controller->base + SPI_CONFIG);
812
813 config = readl_relaxed(controller->base + QUP_CONFIG);
814 config &= ~(QUP_CONFIG_NO_INPUT | QUP_CONFIG_NO_OUTPUT | QUP_CONFIG_N);
815 config |= xfer->bits_per_word - 1;
816 config |= QUP_CONFIG_SPI_MODE;
817
818 if (spi_qup_is_dma_xfer(controller->mode)) {
819 if (!xfer->tx_buf)
820 config |= QUP_CONFIG_NO_OUTPUT;
821 if (!xfer->rx_buf)
822 config |= QUP_CONFIG_NO_INPUT;
823 }
824
825 writel_relaxed(config, controller->base + QUP_CONFIG);
826
827
828 if (!controller->qup_v1) {
829 u32 mask = 0;
830
831
832
833
834
835
836 if (spi_qup_is_dma_xfer(controller->mode))
837 mask = QUP_OP_IN_SERVICE_FLAG | QUP_OP_OUT_SERVICE_FLAG;
838
839 writel_relaxed(mask, controller->base + QUP_OPERATIONAL_MASK);
840 }
841
842 return 0;
843}
844
845static int spi_qup_transfer_one(struct spi_master *master,
846 struct spi_device *spi,
847 struct spi_transfer *xfer)
848{
849 struct spi_qup *controller = spi_master_get_devdata(master);
850 unsigned long timeout, flags;
851 int ret;
852
853 ret = spi_qup_io_prep(spi, xfer);
854 if (ret)
855 return ret;
856
857 timeout = DIV_ROUND_UP(xfer->speed_hz, MSEC_PER_SEC);
858 timeout = DIV_ROUND_UP(min_t(unsigned long, SPI_MAX_XFER,
859 xfer->len) * 8, timeout);
860 timeout = 100 * msecs_to_jiffies(timeout);
861
862 reinit_completion(&controller->done);
863
864 spin_lock_irqsave(&controller->lock, flags);
865 controller->xfer = xfer;
866 controller->error = 0;
867 controller->rx_bytes = 0;
868 controller->tx_bytes = 0;
869 spin_unlock_irqrestore(&controller->lock, flags);
870
871 if (spi_qup_is_dma_xfer(controller->mode))
872 ret = spi_qup_do_dma(spi, xfer, timeout);
873 else
874 ret = spi_qup_do_pio(spi, xfer, timeout);
875
876 spi_qup_set_state(controller, QUP_STATE_RESET);
877 spin_lock_irqsave(&controller->lock, flags);
878 if (!ret)
879 ret = controller->error;
880 spin_unlock_irqrestore(&controller->lock, flags);
881
882 if (ret && spi_qup_is_dma_xfer(controller->mode))
883 spi_qup_dma_terminate(master, xfer);
884
885 return ret;
886}
887
888static bool spi_qup_can_dma(struct spi_master *master, struct spi_device *spi,
889 struct spi_transfer *xfer)
890{
891 struct spi_qup *qup = spi_master_get_devdata(master);
892 size_t dma_align = dma_get_cache_alignment();
893 int n_words;
894
895 if (xfer->rx_buf) {
896 if (!IS_ALIGNED((size_t)xfer->rx_buf, dma_align) ||
897 IS_ERR_OR_NULL(master->dma_rx))
898 return false;
899 if (qup->qup_v1 && (xfer->len % qup->in_blk_sz))
900 return false;
901 }
902
903 if (xfer->tx_buf) {
904 if (!IS_ALIGNED((size_t)xfer->tx_buf, dma_align) ||
905 IS_ERR_OR_NULL(master->dma_tx))
906 return false;
907 if (qup->qup_v1 && (xfer->len % qup->out_blk_sz))
908 return false;
909 }
910
911 n_words = xfer->len / DIV_ROUND_UP(xfer->bits_per_word, 8);
912 if (n_words <= (qup->in_fifo_sz / sizeof(u32)))
913 return false;
914
915 return true;
916}
917
918static void spi_qup_release_dma(struct spi_master *master)
919{
920 if (!IS_ERR_OR_NULL(master->dma_rx))
921 dma_release_channel(master->dma_rx);
922 if (!IS_ERR_OR_NULL(master->dma_tx))
923 dma_release_channel(master->dma_tx);
924}
925
926static int spi_qup_init_dma(struct spi_master *master, resource_size_t base)
927{
928 struct spi_qup *spi = spi_master_get_devdata(master);
929 struct dma_slave_config *rx_conf = &spi->rx_conf,
930 *tx_conf = &spi->tx_conf;
931 struct device *dev = spi->dev;
932 int ret;
933
934
935 master->dma_rx = dma_request_chan(dev, "rx");
936 if (IS_ERR(master->dma_rx))
937 return PTR_ERR(master->dma_rx);
938
939 master->dma_tx = dma_request_chan(dev, "tx");
940 if (IS_ERR(master->dma_tx)) {
941 ret = PTR_ERR(master->dma_tx);
942 goto err_tx;
943 }
944
945
946 rx_conf->direction = DMA_DEV_TO_MEM;
947 rx_conf->device_fc = 1;
948 rx_conf->src_addr = base + QUP_INPUT_FIFO;
949 rx_conf->src_maxburst = spi->in_blk_sz;
950
951 tx_conf->direction = DMA_MEM_TO_DEV;
952 tx_conf->device_fc = 1;
953 tx_conf->dst_addr = base + QUP_OUTPUT_FIFO;
954 tx_conf->dst_maxburst = spi->out_blk_sz;
955
956 ret = dmaengine_slave_config(master->dma_rx, rx_conf);
957 if (ret) {
958 dev_err(dev, "failed to configure RX channel\n");
959 goto err;
960 }
961
962 ret = dmaengine_slave_config(master->dma_tx, tx_conf);
963 if (ret) {
964 dev_err(dev, "failed to configure TX channel\n");
965 goto err;
966 }
967
968 return 0;
969
970err:
971 dma_release_channel(master->dma_tx);
972err_tx:
973 dma_release_channel(master->dma_rx);
974 return ret;
975}
976
977static void spi_qup_set_cs(struct spi_device *spi, bool val)
978{
979 struct spi_qup *controller;
980 u32 spi_ioc;
981 u32 spi_ioc_orig;
982
983 controller = spi_master_get_devdata(spi->master);
984 spi_ioc = readl_relaxed(controller->base + SPI_IO_CONTROL);
985 spi_ioc_orig = spi_ioc;
986 if (!val)
987 spi_ioc |= SPI_IO_C_FORCE_CS;
988 else
989 spi_ioc &= ~SPI_IO_C_FORCE_CS;
990
991 if (spi_ioc != spi_ioc_orig)
992 writel_relaxed(spi_ioc, controller->base + SPI_IO_CONTROL);
993}
994
995static int spi_qup_probe(struct platform_device *pdev)
996{
997 struct spi_master *master;
998 struct clk *iclk, *cclk;
999 struct spi_qup *controller;
1000 struct resource *res;
1001 struct device *dev;
1002 void __iomem *base;
1003 u32 max_freq, iomode, num_cs;
1004 int ret, irq, size;
1005
1006 dev = &pdev->dev;
1007 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1008 base = devm_ioremap_resource(dev, res);
1009 if (IS_ERR(base))
1010 return PTR_ERR(base);
1011
1012 irq = platform_get_irq(pdev, 0);
1013 if (irq < 0)
1014 return irq;
1015
1016 cclk = devm_clk_get(dev, "core");
1017 if (IS_ERR(cclk))
1018 return PTR_ERR(cclk);
1019
1020 iclk = devm_clk_get(dev, "iface");
1021 if (IS_ERR(iclk))
1022 return PTR_ERR(iclk);
1023
1024
1025 if (of_property_read_u32(dev->of_node, "spi-max-frequency", &max_freq))
1026 max_freq = SPI_MAX_RATE;
1027
1028 if (!max_freq || max_freq > SPI_MAX_RATE) {
1029 dev_err(dev, "invalid clock frequency %d\n", max_freq);
1030 return -ENXIO;
1031 }
1032
1033 ret = clk_prepare_enable(cclk);
1034 if (ret) {
1035 dev_err(dev, "cannot enable core clock\n");
1036 return ret;
1037 }
1038
1039 ret = clk_prepare_enable(iclk);
1040 if (ret) {
1041 clk_disable_unprepare(cclk);
1042 dev_err(dev, "cannot enable iface clock\n");
1043 return ret;
1044 }
1045
1046 master = spi_alloc_master(dev, sizeof(struct spi_qup));
1047 if (!master) {
1048 clk_disable_unprepare(cclk);
1049 clk_disable_unprepare(iclk);
1050 dev_err(dev, "cannot allocate master\n");
1051 return -ENOMEM;
1052 }
1053
1054
1055 if (of_property_read_u32(dev->of_node, "num-cs", &num_cs) ||
1056 num_cs > SPI_NUM_CHIPSELECTS)
1057 master->num_chipselect = SPI_NUM_CHIPSELECTS;
1058 else
1059 master->num_chipselect = num_cs;
1060
1061 master->bus_num = pdev->id;
1062 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;
1063 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
1064 master->max_speed_hz = max_freq;
1065 master->transfer_one = spi_qup_transfer_one;
1066 master->dev.of_node = pdev->dev.of_node;
1067 master->auto_runtime_pm = true;
1068 master->dma_alignment = dma_get_cache_alignment();
1069 master->max_dma_len = SPI_MAX_XFER;
1070
1071 platform_set_drvdata(pdev, master);
1072
1073 controller = spi_master_get_devdata(master);
1074
1075 controller->dev = dev;
1076 controller->base = base;
1077 controller->iclk = iclk;
1078 controller->cclk = cclk;
1079 controller->irq = irq;
1080
1081 ret = spi_qup_init_dma(master, res->start);
1082 if (ret == -EPROBE_DEFER)
1083 goto error;
1084 else if (!ret)
1085 master->can_dma = spi_qup_can_dma;
1086
1087 controller->qup_v1 = (uintptr_t)of_device_get_match_data(dev);
1088
1089 if (!controller->qup_v1)
1090 master->set_cs = spi_qup_set_cs;
1091
1092 spin_lock_init(&controller->lock);
1093 init_completion(&controller->done);
1094
1095 iomode = readl_relaxed(base + QUP_IO_M_MODES);
1096
1097 size = QUP_IO_M_OUTPUT_BLOCK_SIZE(iomode);
1098 if (size)
1099 controller->out_blk_sz = size * 16;
1100 else
1101 controller->out_blk_sz = 4;
1102
1103 size = QUP_IO_M_INPUT_BLOCK_SIZE(iomode);
1104 if (size)
1105 controller->in_blk_sz = size * 16;
1106 else
1107 controller->in_blk_sz = 4;
1108
1109 size = QUP_IO_M_OUTPUT_FIFO_SIZE(iomode);
1110 controller->out_fifo_sz = controller->out_blk_sz * (2 << size);
1111
1112 size = QUP_IO_M_INPUT_FIFO_SIZE(iomode);
1113 controller->in_fifo_sz = controller->in_blk_sz * (2 << size);
1114
1115 dev_info(dev, "IN:block:%d, fifo:%d, OUT:block:%d, fifo:%d\n",
1116 controller->in_blk_sz, controller->in_fifo_sz,
1117 controller->out_blk_sz, controller->out_fifo_sz);
1118
1119 writel_relaxed(1, base + QUP_SW_RESET);
1120
1121 ret = spi_qup_set_state(controller, QUP_STATE_RESET);
1122 if (ret) {
1123 dev_err(dev, "cannot set RESET state\n");
1124 goto error_dma;
1125 }
1126
1127 writel_relaxed(0, base + QUP_OPERATIONAL);
1128 writel_relaxed(0, base + QUP_IO_M_MODES);
1129
1130 if (!controller->qup_v1)
1131 writel_relaxed(0, base + QUP_OPERATIONAL_MASK);
1132
1133 writel_relaxed(SPI_ERROR_CLK_UNDER_RUN | SPI_ERROR_CLK_OVER_RUN,
1134 base + SPI_ERROR_FLAGS_EN);
1135
1136
1137 if (controller->qup_v1)
1138 writel_relaxed(QUP_ERROR_OUTPUT_OVER_RUN |
1139 QUP_ERROR_INPUT_UNDER_RUN | QUP_ERROR_OUTPUT_UNDER_RUN,
1140 base + QUP_ERROR_FLAGS_EN);
1141
1142 writel_relaxed(0, base + SPI_CONFIG);
1143 writel_relaxed(SPI_IO_C_NO_TRI_STATE, base + SPI_IO_CONTROL);
1144
1145 ret = devm_request_irq(dev, irq, spi_qup_qup_irq,
1146 IRQF_TRIGGER_HIGH, pdev->name, controller);
1147 if (ret)
1148 goto error_dma;
1149
1150 pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
1151 pm_runtime_use_autosuspend(dev);
1152 pm_runtime_set_active(dev);
1153 pm_runtime_enable(dev);
1154
1155 ret = devm_spi_register_master(dev, master);
1156 if (ret)
1157 goto disable_pm;
1158
1159 return 0;
1160
1161disable_pm:
1162 pm_runtime_disable(&pdev->dev);
1163error_dma:
1164 spi_qup_release_dma(master);
1165error:
1166 clk_disable_unprepare(cclk);
1167 clk_disable_unprepare(iclk);
1168 spi_master_put(master);
1169 return ret;
1170}
1171
1172#ifdef CONFIG_PM
1173static int spi_qup_pm_suspend_runtime(struct device *device)
1174{
1175 struct spi_master *master = dev_get_drvdata(device);
1176 struct spi_qup *controller = spi_master_get_devdata(master);
1177 u32 config;
1178
1179
1180 config = readl(controller->base + QUP_CONFIG);
1181 config |= QUP_CONFIG_CLOCK_AUTO_GATE;
1182 writel_relaxed(config, controller->base + QUP_CONFIG);
1183
1184 clk_disable_unprepare(controller->cclk);
1185 clk_disable_unprepare(controller->iclk);
1186
1187 return 0;
1188}
1189
1190static int spi_qup_pm_resume_runtime(struct device *device)
1191{
1192 struct spi_master *master = dev_get_drvdata(device);
1193 struct spi_qup *controller = spi_master_get_devdata(master);
1194 u32 config;
1195 int ret;
1196
1197 ret = clk_prepare_enable(controller->iclk);
1198 if (ret)
1199 return ret;
1200
1201 ret = clk_prepare_enable(controller->cclk);
1202 if (ret)
1203 return ret;
1204
1205
1206 config = readl_relaxed(controller->base + QUP_CONFIG);
1207 config &= ~QUP_CONFIG_CLOCK_AUTO_GATE;
1208 writel_relaxed(config, controller->base + QUP_CONFIG);
1209 return 0;
1210}
1211#endif
1212
1213#ifdef CONFIG_PM_SLEEP
1214static int spi_qup_suspend(struct device *device)
1215{
1216 struct spi_master *master = dev_get_drvdata(device);
1217 struct spi_qup *controller = spi_master_get_devdata(master);
1218 int ret;
1219
1220 if (pm_runtime_suspended(device)) {
1221 ret = spi_qup_pm_resume_runtime(device);
1222 if (ret)
1223 return ret;
1224 }
1225 ret = spi_master_suspend(master);
1226 if (ret)
1227 return ret;
1228
1229 ret = spi_qup_set_state(controller, QUP_STATE_RESET);
1230 if (ret)
1231 return ret;
1232
1233 clk_disable_unprepare(controller->cclk);
1234 clk_disable_unprepare(controller->iclk);
1235 return 0;
1236}
1237
1238static int spi_qup_resume(struct device *device)
1239{
1240 struct spi_master *master = dev_get_drvdata(device);
1241 struct spi_qup *controller = spi_master_get_devdata(master);
1242 int ret;
1243
1244 ret = clk_prepare_enable(controller->iclk);
1245 if (ret)
1246 return ret;
1247
1248 ret = clk_prepare_enable(controller->cclk);
1249 if (ret)
1250 return ret;
1251
1252 ret = spi_qup_set_state(controller, QUP_STATE_RESET);
1253 if (ret)
1254 return ret;
1255
1256 return spi_master_resume(master);
1257}
1258#endif
1259
1260static int spi_qup_remove(struct platform_device *pdev)
1261{
1262 struct spi_master *master = dev_get_drvdata(&pdev->dev);
1263 struct spi_qup *controller = spi_master_get_devdata(master);
1264 int ret;
1265
1266 ret = pm_runtime_resume_and_get(&pdev->dev);
1267 if (ret < 0)
1268 return ret;
1269
1270 ret = spi_qup_set_state(controller, QUP_STATE_RESET);
1271 if (ret)
1272 return ret;
1273
1274 spi_qup_release_dma(master);
1275
1276 clk_disable_unprepare(controller->cclk);
1277 clk_disable_unprepare(controller->iclk);
1278
1279 pm_runtime_put_noidle(&pdev->dev);
1280 pm_runtime_disable(&pdev->dev);
1281
1282 return 0;
1283}
1284
1285static const struct of_device_id spi_qup_dt_match[] = {
1286 { .compatible = "qcom,spi-qup-v1.1.1", .data = (void *)1, },
1287 { .compatible = "qcom,spi-qup-v2.1.1", },
1288 { .compatible = "qcom,spi-qup-v2.2.1", },
1289 { }
1290};
1291MODULE_DEVICE_TABLE(of, spi_qup_dt_match);
1292
1293static const struct dev_pm_ops spi_qup_dev_pm_ops = {
1294 SET_SYSTEM_SLEEP_PM_OPS(spi_qup_suspend, spi_qup_resume)
1295 SET_RUNTIME_PM_OPS(spi_qup_pm_suspend_runtime,
1296 spi_qup_pm_resume_runtime,
1297 NULL)
1298};
1299
1300static struct platform_driver spi_qup_driver = {
1301 .driver = {
1302 .name = "spi_qup",
1303 .pm = &spi_qup_dev_pm_ops,
1304 .of_match_table = spi_qup_dt_match,
1305 },
1306 .probe = spi_qup_probe,
1307 .remove = spi_qup_remove,
1308};
1309module_platform_driver(spi_qup_driver);
1310
1311MODULE_LICENSE("GPL v2");
1312MODULE_ALIAS("platform:spi_qup");
1313
