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