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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * SPI driver for NVIDIA's Tegra114 SPI Controller.
4 *
5 * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
6 */
7
8#include <linux/clk.h>
9#include <linux/completion.h>
10#include <linux/delay.h>
11#include <linux/dmaengine.h>
12#include <linux/dma-mapping.h>
13#include <linux/dmapool.h>
14#include <linux/err.h>
15#include <linux/interrupt.h>
16#include <linux/io.h>
17#include <linux/kernel.h>
18#include <linux/kthread.h>
19#include <linux/module.h>
20#include <linux/platform_device.h>
21#include <linux/pm_runtime.h>
22#include <linux/of.h>
23#include <linux/reset.h>
24#include <linux/spi/spi.h>
25
26#define SPI_COMMAND1 0x000
27#define SPI_BIT_LENGTH(x) (((x) & 0x1f) << 0)
28#define SPI_PACKED (1 << 5)
29#define SPI_TX_EN (1 << 11)
30#define SPI_RX_EN (1 << 12)
31#define SPI_BOTH_EN_BYTE (1 << 13)
32#define SPI_BOTH_EN_BIT (1 << 14)
33#define SPI_LSBYTE_FE (1 << 15)
34#define SPI_LSBIT_FE (1 << 16)
35#define SPI_BIDIROE (1 << 17)
36#define SPI_IDLE_SDA_DRIVE_LOW (0 << 18)
37#define SPI_IDLE_SDA_DRIVE_HIGH (1 << 18)
38#define SPI_IDLE_SDA_PULL_LOW (2 << 18)
39#define SPI_IDLE_SDA_PULL_HIGH (3 << 18)
40#define SPI_IDLE_SDA_MASK (3 << 18)
41#define SPI_CS_SW_VAL (1 << 20)
42#define SPI_CS_SW_HW (1 << 21)
43/* SPI_CS_POL_INACTIVE bits are default high */
44 /* n from 0 to 3 */
45#define SPI_CS_POL_INACTIVE(n) (1 << (22 + (n)))
46#define SPI_CS_POL_INACTIVE_MASK (0xF << 22)
47
48#define SPI_CS_SEL_0 (0 << 26)
49#define SPI_CS_SEL_1 (1 << 26)
50#define SPI_CS_SEL_2 (2 << 26)
51#define SPI_CS_SEL_3 (3 << 26)
52#define SPI_CS_SEL_MASK (3 << 26)
53#define SPI_CS_SEL(x) (((x) & 0x3) << 26)
54#define SPI_CONTROL_MODE_0 (0 << 28)
55#define SPI_CONTROL_MODE_1 (1 << 28)
56#define SPI_CONTROL_MODE_2 (2 << 28)
57#define SPI_CONTROL_MODE_3 (3 << 28)
58#define SPI_CONTROL_MODE_MASK (3 << 28)
59#define SPI_MODE_SEL(x) (((x) & 0x3) << 28)
60#define SPI_M_S (1 << 30)
61#define SPI_PIO (1 << 31)
62
63#define SPI_COMMAND2 0x004
64#define SPI_TX_TAP_DELAY(x) (((x) & 0x3F) << 6)
65#define SPI_RX_TAP_DELAY(x) (((x) & 0x3F) << 0)
66
67#define SPI_CS_TIMING1 0x008
68#define SPI_SETUP_HOLD(setup, hold) (((setup) << 4) | (hold))
69#define SPI_CS_SETUP_HOLD(reg, cs, val) \
70 ((((val) & 0xFFu) << ((cs) * 8)) | \
71 ((reg) & ~(0xFFu << ((cs) * 8))))
72
73#define SPI_CS_TIMING2 0x00C
74#define CYCLES_BETWEEN_PACKETS_0(x) (((x) & 0x1F) << 0)
75#define CS_ACTIVE_BETWEEN_PACKETS_0 (1 << 5)
76#define CYCLES_BETWEEN_PACKETS_1(x) (((x) & 0x1F) << 8)
77#define CS_ACTIVE_BETWEEN_PACKETS_1 (1 << 13)
78#define CYCLES_BETWEEN_PACKETS_2(x) (((x) & 0x1F) << 16)
79#define CS_ACTIVE_BETWEEN_PACKETS_2 (1 << 21)
80#define CYCLES_BETWEEN_PACKETS_3(x) (((x) & 0x1F) << 24)
81#define CS_ACTIVE_BETWEEN_PACKETS_3 (1 << 29)
82#define SPI_SET_CS_ACTIVE_BETWEEN_PACKETS(reg, cs, val) \
83 (reg = (((val) & 0x1) << ((cs) * 8 + 5)) | \
84 ((reg) & ~(1 << ((cs) * 8 + 5))))
85#define SPI_SET_CYCLES_BETWEEN_PACKETS(reg, cs, val) \
86 (reg = (((val) & 0x1F) << ((cs) * 8)) | \
87 ((reg) & ~(0x1F << ((cs) * 8))))
88#define MAX_SETUP_HOLD_CYCLES 16
89#define MAX_INACTIVE_CYCLES 32
90
91#define SPI_TRANS_STATUS 0x010
92#define SPI_BLK_CNT(val) (((val) >> 0) & 0xFFFF)
93#define SPI_SLV_IDLE_COUNT(val) (((val) >> 16) & 0xFF)
94#define SPI_RDY (1 << 30)
95
96#define SPI_FIFO_STATUS 0x014
97#define SPI_RX_FIFO_EMPTY (1 << 0)
98#define SPI_RX_FIFO_FULL (1 << 1)
99#define SPI_TX_FIFO_EMPTY (1 << 2)
100#define SPI_TX_FIFO_FULL (1 << 3)
101#define SPI_RX_FIFO_UNF (1 << 4)
102#define SPI_RX_FIFO_OVF (1 << 5)
103#define SPI_TX_FIFO_UNF (1 << 6)
104#define SPI_TX_FIFO_OVF (1 << 7)
105#define SPI_ERR (1 << 8)
106#define SPI_TX_FIFO_FLUSH (1 << 14)
107#define SPI_RX_FIFO_FLUSH (1 << 15)
108#define SPI_TX_FIFO_EMPTY_COUNT(val) (((val) >> 16) & 0x7F)
109#define SPI_RX_FIFO_FULL_COUNT(val) (((val) >> 23) & 0x7F)
110#define SPI_FRAME_END (1 << 30)
111#define SPI_CS_INACTIVE (1 << 31)
112
113#define SPI_FIFO_ERROR (SPI_RX_FIFO_UNF | \
114 SPI_RX_FIFO_OVF | SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF)
115#define SPI_FIFO_EMPTY (SPI_RX_FIFO_EMPTY | SPI_TX_FIFO_EMPTY)
116
117#define SPI_TX_DATA 0x018
118#define SPI_RX_DATA 0x01C
119
120#define SPI_DMA_CTL 0x020
121#define SPI_TX_TRIG_1 (0 << 15)
122#define SPI_TX_TRIG_4 (1 << 15)
123#define SPI_TX_TRIG_8 (2 << 15)
124#define SPI_TX_TRIG_16 (3 << 15)
125#define SPI_TX_TRIG_MASK (3 << 15)
126#define SPI_RX_TRIG_1 (0 << 19)
127#define SPI_RX_TRIG_4 (1 << 19)
128#define SPI_RX_TRIG_8 (2 << 19)
129#define SPI_RX_TRIG_16 (3 << 19)
130#define SPI_RX_TRIG_MASK (3 << 19)
131#define SPI_IE_TX (1 << 28)
132#define SPI_IE_RX (1 << 29)
133#define SPI_CONT (1 << 30)
134#define SPI_DMA (1 << 31)
135#define SPI_DMA_EN SPI_DMA
136
137#define SPI_DMA_BLK 0x024
138#define SPI_DMA_BLK_SET(x) (((x) & 0xFFFF) << 0)
139
140#define SPI_TX_FIFO 0x108
141#define SPI_RX_FIFO 0x188
142#define SPI_INTR_MASK 0x18c
143#define SPI_INTR_ALL_MASK (0x1fUL << 25)
144#define MAX_CHIP_SELECT 4
145#define SPI_FIFO_DEPTH 64
146#define DATA_DIR_TX (1 << 0)
147#define DATA_DIR_RX (1 << 1)
148
149#define SPI_DMA_TIMEOUT (msecs_to_jiffies(1000))
150#define DEFAULT_SPI_DMA_BUF_LEN (16*1024)
151#define TX_FIFO_EMPTY_COUNT_MAX SPI_TX_FIFO_EMPTY_COUNT(0x40)
152#define RX_FIFO_FULL_COUNT_ZERO SPI_RX_FIFO_FULL_COUNT(0)
153#define MAX_HOLD_CYCLES 16
154#define SPI_DEFAULT_SPEED 25000000
155
156struct tegra_spi_soc_data {
157 bool has_intr_mask_reg;
158};
159
160struct tegra_spi_client_data {
161 int tx_clk_tap_delay;
162 int rx_clk_tap_delay;
163};
164
165struct tegra_spi_data {
166 struct device *dev;
167 struct spi_controller *host;
168 spinlock_t lock;
169
170 struct clk *clk;
171 struct reset_control *rst;
172 void __iomem *base;
173 phys_addr_t phys;
174 unsigned irq;
175 u32 cur_speed;
176
177 struct spi_device *cur_spi;
178 struct spi_device *cs_control;
179 unsigned cur_pos;
180 unsigned words_per_32bit;
181 unsigned bytes_per_word;
182 unsigned curr_dma_words;
183 unsigned cur_direction;
184
185 unsigned cur_rx_pos;
186 unsigned cur_tx_pos;
187
188 unsigned dma_buf_size;
189 unsigned max_buf_size;
190 bool is_curr_dma_xfer;
191 bool use_hw_based_cs;
192
193 struct completion rx_dma_complete;
194 struct completion tx_dma_complete;
195
196 u32 tx_status;
197 u32 rx_status;
198 u32 status_reg;
199 bool is_packed;
200
201 u32 command1_reg;
202 u32 dma_control_reg;
203 u32 def_command1_reg;
204 u32 def_command2_reg;
205 u32 spi_cs_timing1;
206 u32 spi_cs_timing2;
207 u8 last_used_cs;
208
209 struct completion xfer_completion;
210 struct spi_transfer *curr_xfer;
211 struct dma_chan *rx_dma_chan;
212 u32 *rx_dma_buf;
213 dma_addr_t rx_dma_phys;
214 struct dma_async_tx_descriptor *rx_dma_desc;
215
216 struct dma_chan *tx_dma_chan;
217 u32 *tx_dma_buf;
218 dma_addr_t tx_dma_phys;
219 struct dma_async_tx_descriptor *tx_dma_desc;
220 const struct tegra_spi_soc_data *soc_data;
221};
222
223static int tegra_spi_runtime_suspend(struct device *dev);
224static int tegra_spi_runtime_resume(struct device *dev);
225
226static inline u32 tegra_spi_readl(struct tegra_spi_data *tspi,
227 unsigned long reg)
228{
229 return readl(tspi->base + reg);
230}
231
232static inline void tegra_spi_writel(struct tegra_spi_data *tspi,
233 u32 val, unsigned long reg)
234{
235 writel(val, tspi->base + reg);
236
237 /* Read back register to make sure that register writes completed */
238 if (reg != SPI_TX_FIFO)
239 readl(tspi->base + SPI_COMMAND1);
240}
241
242static void tegra_spi_clear_status(struct tegra_spi_data *tspi)
243{
244 u32 val;
245
246 /* Write 1 to clear status register */
247 val = tegra_spi_readl(tspi, SPI_TRANS_STATUS);
248 tegra_spi_writel(tspi, val, SPI_TRANS_STATUS);
249
250 /* Clear fifo status error if any */
251 val = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
252 if (val & SPI_ERR)
253 tegra_spi_writel(tspi, SPI_ERR | SPI_FIFO_ERROR,
254 SPI_FIFO_STATUS);
255}
256
257static unsigned tegra_spi_calculate_curr_xfer_param(
258 struct spi_device *spi, struct tegra_spi_data *tspi,
259 struct spi_transfer *t)
260{
261 unsigned remain_len = t->len - tspi->cur_pos;
262 unsigned max_word;
263 unsigned bits_per_word = t->bits_per_word;
264 unsigned max_len;
265 unsigned total_fifo_words;
266
267 tspi->bytes_per_word = DIV_ROUND_UP(bits_per_word, 8);
268
269 if ((bits_per_word == 8 || bits_per_word == 16 ||
270 bits_per_word == 32) && t->len > 3) {
271 tspi->is_packed = true;
272 tspi->words_per_32bit = 32/bits_per_word;
273 } else {
274 tspi->is_packed = false;
275 tspi->words_per_32bit = 1;
276 }
277
278 if (tspi->is_packed) {
279 max_len = min(remain_len, tspi->max_buf_size);
280 tspi->curr_dma_words = max_len/tspi->bytes_per_word;
281 total_fifo_words = (max_len + 3) / 4;
282 } else {
283 max_word = (remain_len - 1) / tspi->bytes_per_word + 1;
284 max_word = min(max_word, tspi->max_buf_size/4);
285 tspi->curr_dma_words = max_word;
286 total_fifo_words = max_word;
287 }
288 return total_fifo_words;
289}
290
291static unsigned tegra_spi_fill_tx_fifo_from_client_txbuf(
292 struct tegra_spi_data *tspi, struct spi_transfer *t)
293{
294 unsigned nbytes;
295 unsigned tx_empty_count;
296 u32 fifo_status;
297 unsigned max_n_32bit;
298 unsigned i, count;
299 unsigned int written_words;
300 unsigned fifo_words_left;
301 u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos;
302
303 fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
304 tx_empty_count = SPI_TX_FIFO_EMPTY_COUNT(fifo_status);
305
306 if (tspi->is_packed) {
307 fifo_words_left = tx_empty_count * tspi->words_per_32bit;
308 written_words = min(fifo_words_left, tspi->curr_dma_words);
309 nbytes = written_words * tspi->bytes_per_word;
310 max_n_32bit = DIV_ROUND_UP(nbytes, 4);
311 for (count = 0; count < max_n_32bit; count++) {
312 u32 x = 0;
313
314 for (i = 0; (i < 4) && nbytes; i++, nbytes--)
315 x |= (u32)(*tx_buf++) << (i * 8);
316 tegra_spi_writel(tspi, x, SPI_TX_FIFO);
317 }
318
319 tspi->cur_tx_pos += written_words * tspi->bytes_per_word;
320 } else {
321 unsigned int write_bytes;
322 max_n_32bit = min(tspi->curr_dma_words, tx_empty_count);
323 written_words = max_n_32bit;
324 nbytes = written_words * tspi->bytes_per_word;
325 if (nbytes > t->len - tspi->cur_pos)
326 nbytes = t->len - tspi->cur_pos;
327 write_bytes = nbytes;
328 for (count = 0; count < max_n_32bit; count++) {
329 u32 x = 0;
330
331 for (i = 0; nbytes && (i < tspi->bytes_per_word);
332 i++, nbytes--)
333 x |= (u32)(*tx_buf++) << (i * 8);
334 tegra_spi_writel(tspi, x, SPI_TX_FIFO);
335 }
336
337 tspi->cur_tx_pos += write_bytes;
338 }
339
340 return written_words;
341}
342
343static unsigned int tegra_spi_read_rx_fifo_to_client_rxbuf(
344 struct tegra_spi_data *tspi, struct spi_transfer *t)
345{
346 unsigned rx_full_count;
347 u32 fifo_status;
348 unsigned i, count;
349 unsigned int read_words = 0;
350 unsigned len;
351 u8 *rx_buf = (u8 *)t->rx_buf + tspi->cur_rx_pos;
352
353 fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
354 rx_full_count = SPI_RX_FIFO_FULL_COUNT(fifo_status);
355 if (tspi->is_packed) {
356 len = tspi->curr_dma_words * tspi->bytes_per_word;
357 for (count = 0; count < rx_full_count; count++) {
358 u32 x = tegra_spi_readl(tspi, SPI_RX_FIFO);
359
360 for (i = 0; len && (i < 4); i++, len--)
361 *rx_buf++ = (x >> i*8) & 0xFF;
362 }
363 read_words += tspi->curr_dma_words;
364 tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word;
365 } else {
366 u32 rx_mask = ((u32)1 << t->bits_per_word) - 1;
367 u8 bytes_per_word = tspi->bytes_per_word;
368 unsigned int read_bytes;
369
370 len = rx_full_count * bytes_per_word;
371 if (len > t->len - tspi->cur_pos)
372 len = t->len - tspi->cur_pos;
373 read_bytes = len;
374 for (count = 0; count < rx_full_count; count++) {
375 u32 x = tegra_spi_readl(tspi, SPI_RX_FIFO) & rx_mask;
376
377 for (i = 0; len && (i < bytes_per_word); i++, len--)
378 *rx_buf++ = (x >> (i*8)) & 0xFF;
379 }
380 read_words += rx_full_count;
381 tspi->cur_rx_pos += read_bytes;
382 }
383
384 return read_words;
385}
386
387static void tegra_spi_copy_client_txbuf_to_spi_txbuf(
388 struct tegra_spi_data *tspi, struct spi_transfer *t)
389{
390 /* Make the dma buffer to read by cpu */
391 dma_sync_single_for_cpu(tspi->dev, tspi->tx_dma_phys,
392 tspi->dma_buf_size, DMA_TO_DEVICE);
393
394 if (tspi->is_packed) {
395 unsigned len = tspi->curr_dma_words * tspi->bytes_per_word;
396
397 memcpy(tspi->tx_dma_buf, t->tx_buf + tspi->cur_pos, len);
398 tspi->cur_tx_pos += tspi->curr_dma_words * tspi->bytes_per_word;
399 } else {
400 unsigned int i;
401 unsigned int count;
402 u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos;
403 unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word;
404 unsigned int write_bytes;
405
406 if (consume > t->len - tspi->cur_pos)
407 consume = t->len - tspi->cur_pos;
408 write_bytes = consume;
409 for (count = 0; count < tspi->curr_dma_words; count++) {
410 u32 x = 0;
411
412 for (i = 0; consume && (i < tspi->bytes_per_word);
413 i++, consume--)
414 x |= (u32)(*tx_buf++) << (i * 8);
415 tspi->tx_dma_buf[count] = x;
416 }
417
418 tspi->cur_tx_pos += write_bytes;
419 }
420
421 /* Make the dma buffer to read by dma */
422 dma_sync_single_for_device(tspi->dev, tspi->tx_dma_phys,
423 tspi->dma_buf_size, DMA_TO_DEVICE);
424}
425
426static void tegra_spi_copy_spi_rxbuf_to_client_rxbuf(
427 struct tegra_spi_data *tspi, struct spi_transfer *t)
428{
429 /* Make the dma buffer to read by cpu */
430 dma_sync_single_for_cpu(tspi->dev, tspi->rx_dma_phys,
431 tspi->dma_buf_size, DMA_FROM_DEVICE);
432
433 if (tspi->is_packed) {
434 unsigned len = tspi->curr_dma_words * tspi->bytes_per_word;
435
436 memcpy(t->rx_buf + tspi->cur_rx_pos, tspi->rx_dma_buf, len);
437 tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word;
438 } else {
439 unsigned int i;
440 unsigned int count;
441 unsigned char *rx_buf = t->rx_buf + tspi->cur_rx_pos;
442 u32 rx_mask = ((u32)1 << t->bits_per_word) - 1;
443 unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word;
444 unsigned int read_bytes;
445
446 if (consume > t->len - tspi->cur_pos)
447 consume = t->len - tspi->cur_pos;
448 read_bytes = consume;
449 for (count = 0; count < tspi->curr_dma_words; count++) {
450 u32 x = tspi->rx_dma_buf[count] & rx_mask;
451
452 for (i = 0; consume && (i < tspi->bytes_per_word);
453 i++, consume--)
454 *rx_buf++ = (x >> (i*8)) & 0xFF;
455 }
456
457 tspi->cur_rx_pos += read_bytes;
458 }
459
460 /* Make the dma buffer to read by dma */
461 dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys,
462 tspi->dma_buf_size, DMA_FROM_DEVICE);
463}
464
465static void tegra_spi_dma_complete(void *args)
466{
467 struct completion *dma_complete = args;
468
469 complete(dma_complete);
470}
471
472static int tegra_spi_start_tx_dma(struct tegra_spi_data *tspi, int len)
473{
474 reinit_completion(&tspi->tx_dma_complete);
475 tspi->tx_dma_desc = dmaengine_prep_slave_single(tspi->tx_dma_chan,
476 tspi->tx_dma_phys, len, DMA_MEM_TO_DEV,
477 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
478 if (!tspi->tx_dma_desc) {
479 dev_err(tspi->dev, "Not able to get desc for Tx\n");
480 return -EIO;
481 }
482
483 tspi->tx_dma_desc->callback = tegra_spi_dma_complete;
484 tspi->tx_dma_desc->callback_param = &tspi->tx_dma_complete;
485
486 dmaengine_submit(tspi->tx_dma_desc);
487 dma_async_issue_pending(tspi->tx_dma_chan);
488 return 0;
489}
490
491static int tegra_spi_start_rx_dma(struct tegra_spi_data *tspi, int len)
492{
493 reinit_completion(&tspi->rx_dma_complete);
494 tspi->rx_dma_desc = dmaengine_prep_slave_single(tspi->rx_dma_chan,
495 tspi->rx_dma_phys, len, DMA_DEV_TO_MEM,
496 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
497 if (!tspi->rx_dma_desc) {
498 dev_err(tspi->dev, "Not able to get desc for Rx\n");
499 return -EIO;
500 }
501
502 tspi->rx_dma_desc->callback = tegra_spi_dma_complete;
503 tspi->rx_dma_desc->callback_param = &tspi->rx_dma_complete;
504
505 dmaengine_submit(tspi->rx_dma_desc);
506 dma_async_issue_pending(tspi->rx_dma_chan);
507 return 0;
508}
509
510static int tegra_spi_flush_fifos(struct tegra_spi_data *tspi)
511{
512 unsigned long timeout = jiffies + HZ;
513 u32 status;
514
515 status = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
516 if ((status & SPI_FIFO_EMPTY) != SPI_FIFO_EMPTY) {
517 status |= SPI_RX_FIFO_FLUSH | SPI_TX_FIFO_FLUSH;
518 tegra_spi_writel(tspi, status, SPI_FIFO_STATUS);
519 while ((status & SPI_FIFO_EMPTY) != SPI_FIFO_EMPTY) {
520 status = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
521 if (time_after(jiffies, timeout)) {
522 dev_err(tspi->dev,
523 "timeout waiting for fifo flush\n");
524 return -EIO;
525 }
526
527 udelay(1);
528 }
529 }
530
531 return 0;
532}
533
534static int tegra_spi_start_dma_based_transfer(
535 struct tegra_spi_data *tspi, struct spi_transfer *t)
536{
537 u32 val;
538 unsigned int len;
539 int ret = 0;
540 u8 dma_burst;
541 struct dma_slave_config dma_sconfig = {0};
542
543 val = SPI_DMA_BLK_SET(tspi->curr_dma_words - 1);
544 tegra_spi_writel(tspi, val, SPI_DMA_BLK);
545
546 if (tspi->is_packed)
547 len = DIV_ROUND_UP(tspi->curr_dma_words * tspi->bytes_per_word,
548 4) * 4;
549 else
550 len = tspi->curr_dma_words * 4;
551
552 /* Set attention level based on length of transfer */
553 if (len & 0xF) {
554 val |= SPI_TX_TRIG_1 | SPI_RX_TRIG_1;
555 dma_burst = 1;
556 } else if (((len) >> 4) & 0x1) {
557 val |= SPI_TX_TRIG_4 | SPI_RX_TRIG_4;
558 dma_burst = 4;
559 } else {
560 val |= SPI_TX_TRIG_8 | SPI_RX_TRIG_8;
561 dma_burst = 8;
562 }
563
564 if (!tspi->soc_data->has_intr_mask_reg) {
565 if (tspi->cur_direction & DATA_DIR_TX)
566 val |= SPI_IE_TX;
567
568 if (tspi->cur_direction & DATA_DIR_RX)
569 val |= SPI_IE_RX;
570 }
571
572 tegra_spi_writel(tspi, val, SPI_DMA_CTL);
573 tspi->dma_control_reg = val;
574
575 dma_sconfig.device_fc = true;
576 if (tspi->cur_direction & DATA_DIR_TX) {
577 dma_sconfig.dst_addr = tspi->phys + SPI_TX_FIFO;
578 dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
579 dma_sconfig.dst_maxburst = dma_burst;
580 ret = dmaengine_slave_config(tspi->tx_dma_chan, &dma_sconfig);
581 if (ret < 0) {
582 dev_err(tspi->dev,
583 "DMA slave config failed: %d\n", ret);
584 return ret;
585 }
586
587 tegra_spi_copy_client_txbuf_to_spi_txbuf(tspi, t);
588 ret = tegra_spi_start_tx_dma(tspi, len);
589 if (ret < 0) {
590 dev_err(tspi->dev,
591 "Starting tx dma failed, err %d\n", ret);
592 return ret;
593 }
594 }
595
596 if (tspi->cur_direction & DATA_DIR_RX) {
597 dma_sconfig.src_addr = tspi->phys + SPI_RX_FIFO;
598 dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
599 dma_sconfig.src_maxburst = dma_burst;
600 ret = dmaengine_slave_config(tspi->rx_dma_chan, &dma_sconfig);
601 if (ret < 0) {
602 dev_err(tspi->dev,
603 "DMA slave config failed: %d\n", ret);
604 return ret;
605 }
606
607 /* Make the dma buffer to read by dma */
608 dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys,
609 tspi->dma_buf_size, DMA_FROM_DEVICE);
610
611 ret = tegra_spi_start_rx_dma(tspi, len);
612 if (ret < 0) {
613 dev_err(tspi->dev,
614 "Starting rx dma failed, err %d\n", ret);
615 if (tspi->cur_direction & DATA_DIR_TX)
616 dmaengine_terminate_all(tspi->tx_dma_chan);
617 return ret;
618 }
619 }
620 tspi->is_curr_dma_xfer = true;
621 tspi->dma_control_reg = val;
622
623 val |= SPI_DMA_EN;
624 tegra_spi_writel(tspi, val, SPI_DMA_CTL);
625 return ret;
626}
627
628static int tegra_spi_start_cpu_based_transfer(
629 struct tegra_spi_data *tspi, struct spi_transfer *t)
630{
631 u32 val;
632 unsigned cur_words;
633
634 if (tspi->cur_direction & DATA_DIR_TX)
635 cur_words = tegra_spi_fill_tx_fifo_from_client_txbuf(tspi, t);
636 else
637 cur_words = tspi->curr_dma_words;
638
639 val = SPI_DMA_BLK_SET(cur_words - 1);
640 tegra_spi_writel(tspi, val, SPI_DMA_BLK);
641
642 val = 0;
643 if (tspi->cur_direction & DATA_DIR_TX)
644 val |= SPI_IE_TX;
645
646 if (tspi->cur_direction & DATA_DIR_RX)
647 val |= SPI_IE_RX;
648
649 tegra_spi_writel(tspi, val, SPI_DMA_CTL);
650 tspi->dma_control_reg = val;
651
652 tspi->is_curr_dma_xfer = false;
653
654 val = tspi->command1_reg;
655 val |= SPI_PIO;
656 tegra_spi_writel(tspi, val, SPI_COMMAND1);
657 return 0;
658}
659
660static int tegra_spi_init_dma_param(struct tegra_spi_data *tspi,
661 bool dma_to_memory)
662{
663 struct dma_chan *dma_chan;
664 u32 *dma_buf;
665 dma_addr_t dma_phys;
666
667 dma_chan = dma_request_chan(tspi->dev, dma_to_memory ? "rx" : "tx");
668 if (IS_ERR(dma_chan))
669 return dev_err_probe(tspi->dev, PTR_ERR(dma_chan),
670 "Dma channel is not available\n");
671
672 dma_buf = dma_alloc_coherent(tspi->dev, tspi->dma_buf_size,
673 &dma_phys, GFP_KERNEL);
674 if (!dma_buf) {
675 dev_err(tspi->dev, " Not able to allocate the dma buffer\n");
676 dma_release_channel(dma_chan);
677 return -ENOMEM;
678 }
679
680 if (dma_to_memory) {
681 tspi->rx_dma_chan = dma_chan;
682 tspi->rx_dma_buf = dma_buf;
683 tspi->rx_dma_phys = dma_phys;
684 } else {
685 tspi->tx_dma_chan = dma_chan;
686 tspi->tx_dma_buf = dma_buf;
687 tspi->tx_dma_phys = dma_phys;
688 }
689 return 0;
690}
691
692static void tegra_spi_deinit_dma_param(struct tegra_spi_data *tspi,
693 bool dma_to_memory)
694{
695 u32 *dma_buf;
696 dma_addr_t dma_phys;
697 struct dma_chan *dma_chan;
698
699 if (dma_to_memory) {
700 dma_buf = tspi->rx_dma_buf;
701 dma_chan = tspi->rx_dma_chan;
702 dma_phys = tspi->rx_dma_phys;
703 tspi->rx_dma_chan = NULL;
704 tspi->rx_dma_buf = NULL;
705 } else {
706 dma_buf = tspi->tx_dma_buf;
707 dma_chan = tspi->tx_dma_chan;
708 dma_phys = tspi->tx_dma_phys;
709 tspi->tx_dma_buf = NULL;
710 tspi->tx_dma_chan = NULL;
711 }
712 if (!dma_chan)
713 return;
714
715 dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys);
716 dma_release_channel(dma_chan);
717}
718
719static int tegra_spi_set_hw_cs_timing(struct spi_device *spi)
720{
721 struct tegra_spi_data *tspi = spi_controller_get_devdata(spi->controller);
722 struct spi_delay *setup = &spi->cs_setup;
723 struct spi_delay *hold = &spi->cs_hold;
724 struct spi_delay *inactive = &spi->cs_inactive;
725 u8 setup_dly, hold_dly;
726 u32 setup_hold;
727 u32 spi_cs_timing;
728 u32 inactive_cycles;
729 u8 cs_state;
730
731 if (setup->unit != SPI_DELAY_UNIT_SCK ||
732 hold->unit != SPI_DELAY_UNIT_SCK ||
733 inactive->unit != SPI_DELAY_UNIT_SCK) {
734 dev_err(&spi->dev,
735 "Invalid delay unit %d, should be SPI_DELAY_UNIT_SCK\n",
736 SPI_DELAY_UNIT_SCK);
737 return -EINVAL;
738 }
739
740 setup_dly = min_t(u8, setup->value, MAX_SETUP_HOLD_CYCLES);
741 hold_dly = min_t(u8, hold->value, MAX_SETUP_HOLD_CYCLES);
742 if (setup_dly && hold_dly) {
743 setup_hold = SPI_SETUP_HOLD(setup_dly - 1, hold_dly - 1);
744 spi_cs_timing = SPI_CS_SETUP_HOLD(tspi->spi_cs_timing1,
745 spi_get_chipselect(spi, 0),
746 setup_hold);
747 if (tspi->spi_cs_timing1 != spi_cs_timing) {
748 tspi->spi_cs_timing1 = spi_cs_timing;
749 tegra_spi_writel(tspi, spi_cs_timing, SPI_CS_TIMING1);
750 }
751 }
752
753 inactive_cycles = min_t(u8, inactive->value, MAX_INACTIVE_CYCLES);
754 if (inactive_cycles)
755 inactive_cycles--;
756 cs_state = inactive_cycles ? 0 : 1;
757 spi_cs_timing = tspi->spi_cs_timing2;
758 SPI_SET_CS_ACTIVE_BETWEEN_PACKETS(spi_cs_timing, spi_get_chipselect(spi, 0),
759 cs_state);
760 SPI_SET_CYCLES_BETWEEN_PACKETS(spi_cs_timing, spi_get_chipselect(spi, 0),
761 inactive_cycles);
762 if (tspi->spi_cs_timing2 != spi_cs_timing) {
763 tspi->spi_cs_timing2 = spi_cs_timing;
764 tegra_spi_writel(tspi, spi_cs_timing, SPI_CS_TIMING2);
765 }
766
767 return 0;
768}
769
770static u32 tegra_spi_setup_transfer_one(struct spi_device *spi,
771 struct spi_transfer *t,
772 bool is_first_of_msg,
773 bool is_single_xfer)
774{
775 struct tegra_spi_data *tspi = spi_controller_get_devdata(spi->controller);
776 struct tegra_spi_client_data *cdata = spi->controller_data;
777 u32 speed = t->speed_hz;
778 u8 bits_per_word = t->bits_per_word;
779 u32 command1, command2;
780 int req_mode;
781 u32 tx_tap = 0, rx_tap = 0;
782
783 if (speed != tspi->cur_speed) {
784 clk_set_rate(tspi->clk, speed);
785 tspi->cur_speed = speed;
786 }
787
788 tspi->cur_spi = spi;
789 tspi->cur_pos = 0;
790 tspi->cur_rx_pos = 0;
791 tspi->cur_tx_pos = 0;
792 tspi->curr_xfer = t;
793
794 if (is_first_of_msg) {
795 tegra_spi_clear_status(tspi);
796
797 command1 = tspi->def_command1_reg;
798 command1 |= SPI_BIT_LENGTH(bits_per_word - 1);
799
800 command1 &= ~SPI_CONTROL_MODE_MASK;
801 req_mode = spi->mode & 0x3;
802 if (req_mode == SPI_MODE_0)
803 command1 |= SPI_CONTROL_MODE_0;
804 else if (req_mode == SPI_MODE_1)
805 command1 |= SPI_CONTROL_MODE_1;
806 else if (req_mode == SPI_MODE_2)
807 command1 |= SPI_CONTROL_MODE_2;
808 else if (req_mode == SPI_MODE_3)
809 command1 |= SPI_CONTROL_MODE_3;
810
811 if (spi->mode & SPI_LSB_FIRST)
812 command1 |= SPI_LSBIT_FE;
813 else
814 command1 &= ~SPI_LSBIT_FE;
815
816 if (spi->mode & SPI_3WIRE)
817 command1 |= SPI_BIDIROE;
818 else
819 command1 &= ~SPI_BIDIROE;
820
821 if (tspi->cs_control) {
822 if (tspi->cs_control != spi)
823 tegra_spi_writel(tspi, command1, SPI_COMMAND1);
824 tspi->cs_control = NULL;
825 } else
826 tegra_spi_writel(tspi, command1, SPI_COMMAND1);
827
828 /* GPIO based chip select control */
829 if (spi_get_csgpiod(spi, 0))
830 gpiod_set_value(spi_get_csgpiod(spi, 0), 1);
831
832 if (is_single_xfer && !(t->cs_change)) {
833 tspi->use_hw_based_cs = true;
834 command1 &= ~(SPI_CS_SW_HW | SPI_CS_SW_VAL);
835 } else {
836 tspi->use_hw_based_cs = false;
837 command1 |= SPI_CS_SW_HW;
838 if (spi->mode & SPI_CS_HIGH)
839 command1 |= SPI_CS_SW_VAL;
840 else
841 command1 &= ~SPI_CS_SW_VAL;
842 }
843
844 if (tspi->last_used_cs != spi_get_chipselect(spi, 0)) {
845 if (cdata && cdata->tx_clk_tap_delay)
846 tx_tap = cdata->tx_clk_tap_delay;
847 if (cdata && cdata->rx_clk_tap_delay)
848 rx_tap = cdata->rx_clk_tap_delay;
849 command2 = SPI_TX_TAP_DELAY(tx_tap) |
850 SPI_RX_TAP_DELAY(rx_tap);
851 if (command2 != tspi->def_command2_reg)
852 tegra_spi_writel(tspi, command2, SPI_COMMAND2);
853 tspi->last_used_cs = spi_get_chipselect(spi, 0);
854 }
855
856 } else {
857 command1 = tspi->command1_reg;
858 command1 &= ~SPI_BIT_LENGTH(~0);
859 command1 |= SPI_BIT_LENGTH(bits_per_word - 1);
860 }
861
862 return command1;
863}
864
865static int tegra_spi_start_transfer_one(struct spi_device *spi,
866 struct spi_transfer *t, u32 command1)
867{
868 struct tegra_spi_data *tspi = spi_controller_get_devdata(spi->controller);
869 unsigned total_fifo_words;
870 int ret;
871
872 total_fifo_words = tegra_spi_calculate_curr_xfer_param(spi, tspi, t);
873
874 if (t->rx_nbits == SPI_NBITS_DUAL || t->tx_nbits == SPI_NBITS_DUAL)
875 command1 |= SPI_BOTH_EN_BIT;
876 else
877 command1 &= ~SPI_BOTH_EN_BIT;
878
879 if (tspi->is_packed)
880 command1 |= SPI_PACKED;
881 else
882 command1 &= ~SPI_PACKED;
883
884 command1 &= ~(SPI_CS_SEL_MASK | SPI_TX_EN | SPI_RX_EN);
885 tspi->cur_direction = 0;
886 if (t->rx_buf) {
887 command1 |= SPI_RX_EN;
888 tspi->cur_direction |= DATA_DIR_RX;
889 }
890 if (t->tx_buf) {
891 command1 |= SPI_TX_EN;
892 tspi->cur_direction |= DATA_DIR_TX;
893 }
894 command1 |= SPI_CS_SEL(spi_get_chipselect(spi, 0));
895 tegra_spi_writel(tspi, command1, SPI_COMMAND1);
896 tspi->command1_reg = command1;
897
898 dev_dbg(tspi->dev, "The def 0x%x and written 0x%x\n",
899 tspi->def_command1_reg, (unsigned)command1);
900
901 ret = tegra_spi_flush_fifos(tspi);
902 if (ret < 0)
903 return ret;
904 if (total_fifo_words > SPI_FIFO_DEPTH)
905 ret = tegra_spi_start_dma_based_transfer(tspi, t);
906 else
907 ret = tegra_spi_start_cpu_based_transfer(tspi, t);
908 return ret;
909}
910
911static struct tegra_spi_client_data
912 *tegra_spi_parse_cdata_dt(struct spi_device *spi)
913{
914 struct tegra_spi_client_data *cdata;
915 struct device_node *target_np;
916
917 target_np = spi->dev.of_node;
918 if (!target_np) {
919 dev_dbg(&spi->dev, "device node not found\n");
920 return NULL;
921 }
922
923 cdata = kzalloc(sizeof(*cdata), GFP_KERNEL);
924 if (!cdata)
925 return NULL;
926
927 of_property_read_u32(target_np, "nvidia,tx-clk-tap-delay",
928 &cdata->tx_clk_tap_delay);
929 of_property_read_u32(target_np, "nvidia,rx-clk-tap-delay",
930 &cdata->rx_clk_tap_delay);
931 return cdata;
932}
933
934static void tegra_spi_cleanup(struct spi_device *spi)
935{
936 struct tegra_spi_client_data *cdata = spi->controller_data;
937
938 spi->controller_data = NULL;
939 if (spi->dev.of_node)
940 kfree(cdata);
941}
942
943static int tegra_spi_setup(struct spi_device *spi)
944{
945 struct tegra_spi_data *tspi = spi_controller_get_devdata(spi->controller);
946 struct tegra_spi_client_data *cdata = spi->controller_data;
947 u32 val;
948 unsigned long flags;
949 int ret;
950
951 dev_dbg(&spi->dev, "setup %d bpw, %scpol, %scpha, %dHz\n",
952 spi->bits_per_word,
953 spi->mode & SPI_CPOL ? "" : "~",
954 spi->mode & SPI_CPHA ? "" : "~",
955 spi->max_speed_hz);
956
957 if (!cdata) {
958 cdata = tegra_spi_parse_cdata_dt(spi);
959 spi->controller_data = cdata;
960 }
961
962 ret = pm_runtime_resume_and_get(tspi->dev);
963 if (ret < 0) {
964 dev_err(tspi->dev, "pm runtime failed, e = %d\n", ret);
965 if (cdata)
966 tegra_spi_cleanup(spi);
967 return ret;
968 }
969
970 if (tspi->soc_data->has_intr_mask_reg) {
971 val = tegra_spi_readl(tspi, SPI_INTR_MASK);
972 val &= ~SPI_INTR_ALL_MASK;
973 tegra_spi_writel(tspi, val, SPI_INTR_MASK);
974 }
975
976 spin_lock_irqsave(&tspi->lock, flags);
977 /* GPIO based chip select control */
978 if (spi_get_csgpiod(spi, 0))
979 gpiod_set_value(spi_get_csgpiod(spi, 0), 0);
980
981 val = tspi->def_command1_reg;
982 if (spi->mode & SPI_CS_HIGH)
983 val &= ~SPI_CS_POL_INACTIVE(spi_get_chipselect(spi, 0));
984 else
985 val |= SPI_CS_POL_INACTIVE(spi_get_chipselect(spi, 0));
986 tspi->def_command1_reg = val;
987 tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1);
988 spin_unlock_irqrestore(&tspi->lock, flags);
989
990 pm_runtime_put(tspi->dev);
991 return 0;
992}
993
994static void tegra_spi_transfer_end(struct spi_device *spi)
995{
996 struct tegra_spi_data *tspi = spi_controller_get_devdata(spi->controller);
997 int cs_val = (spi->mode & SPI_CS_HIGH) ? 0 : 1;
998
999 /* GPIO based chip select control */
1000 if (spi_get_csgpiod(spi, 0))
1001 gpiod_set_value(spi_get_csgpiod(spi, 0), 0);
1002
1003 if (!tspi->use_hw_based_cs) {
1004 if (cs_val)
1005 tspi->command1_reg |= SPI_CS_SW_VAL;
1006 else
1007 tspi->command1_reg &= ~SPI_CS_SW_VAL;
1008 tegra_spi_writel(tspi, tspi->command1_reg, SPI_COMMAND1);
1009 }
1010
1011 tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1);
1012}
1013
1014static void tegra_spi_dump_regs(struct tegra_spi_data *tspi)
1015{
1016 dev_dbg(tspi->dev, "============ SPI REGISTER DUMP ============\n");
1017 dev_dbg(tspi->dev, "Command1: 0x%08x | Command2: 0x%08x\n",
1018 tegra_spi_readl(tspi, SPI_COMMAND1),
1019 tegra_spi_readl(tspi, SPI_COMMAND2));
1020 dev_dbg(tspi->dev, "DMA_CTL: 0x%08x | DMA_BLK: 0x%08x\n",
1021 tegra_spi_readl(tspi, SPI_DMA_CTL),
1022 tegra_spi_readl(tspi, SPI_DMA_BLK));
1023 dev_dbg(tspi->dev, "TRANS_STAT: 0x%08x | FIFO_STATUS: 0x%08x\n",
1024 tegra_spi_readl(tspi, SPI_TRANS_STATUS),
1025 tegra_spi_readl(tspi, SPI_FIFO_STATUS));
1026}
1027
1028static int tegra_spi_transfer_one_message(struct spi_controller *host,
1029 struct spi_message *msg)
1030{
1031 bool is_first_msg = true;
1032 struct tegra_spi_data *tspi = spi_controller_get_devdata(host);
1033 struct spi_transfer *xfer;
1034 struct spi_device *spi = msg->spi;
1035 int ret;
1036 bool skip = false;
1037 int single_xfer;
1038
1039 msg->status = 0;
1040 msg->actual_length = 0;
1041
1042 single_xfer = list_is_singular(&msg->transfers);
1043 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
1044 u32 cmd1;
1045
1046 reinit_completion(&tspi->xfer_completion);
1047
1048 cmd1 = tegra_spi_setup_transfer_one(spi, xfer, is_first_msg,
1049 single_xfer);
1050
1051 if (!xfer->len) {
1052 ret = 0;
1053 skip = true;
1054 goto complete_xfer;
1055 }
1056
1057 ret = tegra_spi_start_transfer_one(spi, xfer, cmd1);
1058 if (ret < 0) {
1059 dev_err(tspi->dev,
1060 "spi can not start transfer, err %d\n", ret);
1061 goto complete_xfer;
1062 }
1063
1064 is_first_msg = false;
1065 ret = wait_for_completion_timeout(&tspi->xfer_completion,
1066 SPI_DMA_TIMEOUT);
1067 if (WARN_ON(ret == 0)) {
1068 dev_err(tspi->dev, "spi transfer timeout\n");
1069 if (tspi->is_curr_dma_xfer &&
1070 (tspi->cur_direction & DATA_DIR_TX))
1071 dmaengine_terminate_all(tspi->tx_dma_chan);
1072 if (tspi->is_curr_dma_xfer &&
1073 (tspi->cur_direction & DATA_DIR_RX))
1074 dmaengine_terminate_all(tspi->rx_dma_chan);
1075 ret = -EIO;
1076 tegra_spi_dump_regs(tspi);
1077 tegra_spi_flush_fifos(tspi);
1078 reset_control_assert(tspi->rst);
1079 udelay(2);
1080 reset_control_deassert(tspi->rst);
1081 tspi->last_used_cs = host->num_chipselect + 1;
1082 goto complete_xfer;
1083 }
1084
1085 if (tspi->tx_status || tspi->rx_status) {
1086 dev_err(tspi->dev, "Error in Transfer\n");
1087 ret = -EIO;
1088 tegra_spi_dump_regs(tspi);
1089 goto complete_xfer;
1090 }
1091 msg->actual_length += xfer->len;
1092
1093complete_xfer:
1094 if (ret < 0 || skip) {
1095 tegra_spi_transfer_end(spi);
1096 spi_transfer_delay_exec(xfer);
1097 goto exit;
1098 } else if (list_is_last(&xfer->transfer_list,
1099 &msg->transfers)) {
1100 if (xfer->cs_change)
1101 tspi->cs_control = spi;
1102 else {
1103 tegra_spi_transfer_end(spi);
1104 spi_transfer_delay_exec(xfer);
1105 }
1106 } else if (xfer->cs_change) {
1107 tegra_spi_transfer_end(spi);
1108 spi_transfer_delay_exec(xfer);
1109 }
1110
1111 }
1112 ret = 0;
1113exit:
1114 msg->status = ret;
1115 spi_finalize_current_message(host);
1116 return ret;
1117}
1118
1119static irqreturn_t handle_cpu_based_xfer(struct tegra_spi_data *tspi)
1120{
1121 struct spi_transfer *t = tspi->curr_xfer;
1122 unsigned long flags;
1123
1124 spin_lock_irqsave(&tspi->lock, flags);
1125 if (tspi->tx_status || tspi->rx_status) {
1126 dev_err(tspi->dev, "CpuXfer ERROR bit set 0x%x\n",
1127 tspi->status_reg);
1128 dev_err(tspi->dev, "CpuXfer 0x%08x:0x%08x\n",
1129 tspi->command1_reg, tspi->dma_control_reg);
1130 tegra_spi_dump_regs(tspi);
1131 tegra_spi_flush_fifos(tspi);
1132 complete(&tspi->xfer_completion);
1133 spin_unlock_irqrestore(&tspi->lock, flags);
1134 reset_control_assert(tspi->rst);
1135 udelay(2);
1136 reset_control_deassert(tspi->rst);
1137 return IRQ_HANDLED;
1138 }
1139
1140 if (tspi->cur_direction & DATA_DIR_RX)
1141 tegra_spi_read_rx_fifo_to_client_rxbuf(tspi, t);
1142
1143 if (tspi->cur_direction & DATA_DIR_TX)
1144 tspi->cur_pos = tspi->cur_tx_pos;
1145 else
1146 tspi->cur_pos = tspi->cur_rx_pos;
1147
1148 if (tspi->cur_pos == t->len) {
1149 complete(&tspi->xfer_completion);
1150 goto exit;
1151 }
1152
1153 tegra_spi_calculate_curr_xfer_param(tspi->cur_spi, tspi, t);
1154 tegra_spi_start_cpu_based_transfer(tspi, t);
1155exit:
1156 spin_unlock_irqrestore(&tspi->lock, flags);
1157 return IRQ_HANDLED;
1158}
1159
1160static irqreturn_t handle_dma_based_xfer(struct tegra_spi_data *tspi)
1161{
1162 struct spi_transfer *t = tspi->curr_xfer;
1163 long wait_status;
1164 int err = 0;
1165 unsigned total_fifo_words;
1166 unsigned long flags;
1167
1168 /* Abort dmas if any error */
1169 if (tspi->cur_direction & DATA_DIR_TX) {
1170 if (tspi->tx_status) {
1171 dmaengine_terminate_all(tspi->tx_dma_chan);
1172 err += 1;
1173 } else {
1174 wait_status = wait_for_completion_interruptible_timeout(
1175 &tspi->tx_dma_complete, SPI_DMA_TIMEOUT);
1176 if (wait_status <= 0) {
1177 dmaengine_terminate_all(tspi->tx_dma_chan);
1178 dev_err(tspi->dev, "TxDma Xfer failed\n");
1179 err += 1;
1180 }
1181 }
1182 }
1183
1184 if (tspi->cur_direction & DATA_DIR_RX) {
1185 if (tspi->rx_status) {
1186 dmaengine_terminate_all(tspi->rx_dma_chan);
1187 err += 2;
1188 } else {
1189 wait_status = wait_for_completion_interruptible_timeout(
1190 &tspi->rx_dma_complete, SPI_DMA_TIMEOUT);
1191 if (wait_status <= 0) {
1192 dmaengine_terminate_all(tspi->rx_dma_chan);
1193 dev_err(tspi->dev, "RxDma Xfer failed\n");
1194 err += 2;
1195 }
1196 }
1197 }
1198
1199 spin_lock_irqsave(&tspi->lock, flags);
1200 if (err) {
1201 dev_err(tspi->dev, "DmaXfer: ERROR bit set 0x%x\n",
1202 tspi->status_reg);
1203 dev_err(tspi->dev, "DmaXfer 0x%08x:0x%08x\n",
1204 tspi->command1_reg, tspi->dma_control_reg);
1205 tegra_spi_dump_regs(tspi);
1206 tegra_spi_flush_fifos(tspi);
1207 complete(&tspi->xfer_completion);
1208 spin_unlock_irqrestore(&tspi->lock, flags);
1209 reset_control_assert(tspi->rst);
1210 udelay(2);
1211 reset_control_deassert(tspi->rst);
1212 return IRQ_HANDLED;
1213 }
1214
1215 if (tspi->cur_direction & DATA_DIR_RX)
1216 tegra_spi_copy_spi_rxbuf_to_client_rxbuf(tspi, t);
1217
1218 if (tspi->cur_direction & DATA_DIR_TX)
1219 tspi->cur_pos = tspi->cur_tx_pos;
1220 else
1221 tspi->cur_pos = tspi->cur_rx_pos;
1222
1223 if (tspi->cur_pos == t->len) {
1224 complete(&tspi->xfer_completion);
1225 goto exit;
1226 }
1227
1228 /* Continue transfer in current message */
1229 total_fifo_words = tegra_spi_calculate_curr_xfer_param(tspi->cur_spi,
1230 tspi, t);
1231 if (total_fifo_words > SPI_FIFO_DEPTH)
1232 err = tegra_spi_start_dma_based_transfer(tspi, t);
1233 else
1234 err = tegra_spi_start_cpu_based_transfer(tspi, t);
1235
1236exit:
1237 spin_unlock_irqrestore(&tspi->lock, flags);
1238 return IRQ_HANDLED;
1239}
1240
1241static irqreturn_t tegra_spi_isr_thread(int irq, void *context_data)
1242{
1243 struct tegra_spi_data *tspi = context_data;
1244
1245 if (!tspi->is_curr_dma_xfer)
1246 return handle_cpu_based_xfer(tspi);
1247 return handle_dma_based_xfer(tspi);
1248}
1249
1250static irqreturn_t tegra_spi_isr(int irq, void *context_data)
1251{
1252 struct tegra_spi_data *tspi = context_data;
1253
1254 tspi->status_reg = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
1255 if (tspi->cur_direction & DATA_DIR_TX)
1256 tspi->tx_status = tspi->status_reg &
1257 (SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF);
1258
1259 if (tspi->cur_direction & DATA_DIR_RX)
1260 tspi->rx_status = tspi->status_reg &
1261 (SPI_RX_FIFO_OVF | SPI_RX_FIFO_UNF);
1262 tegra_spi_clear_status(tspi);
1263
1264 return IRQ_WAKE_THREAD;
1265}
1266
1267static struct tegra_spi_soc_data tegra114_spi_soc_data = {
1268 .has_intr_mask_reg = false,
1269};
1270
1271static struct tegra_spi_soc_data tegra124_spi_soc_data = {
1272 .has_intr_mask_reg = false,
1273};
1274
1275static struct tegra_spi_soc_data tegra210_spi_soc_data = {
1276 .has_intr_mask_reg = true,
1277};
1278
1279static const struct of_device_id tegra_spi_of_match[] = {
1280 {
1281 .compatible = "nvidia,tegra114-spi",
1282 .data = &tegra114_spi_soc_data,
1283 }, {
1284 .compatible = "nvidia,tegra124-spi",
1285 .data = &tegra124_spi_soc_data,
1286 }, {
1287 .compatible = "nvidia,tegra210-spi",
1288 .data = &tegra210_spi_soc_data,
1289 },
1290 {}
1291};
1292MODULE_DEVICE_TABLE(of, tegra_spi_of_match);
1293
1294static int tegra_spi_probe(struct platform_device *pdev)
1295{
1296 struct spi_controller *host;
1297 struct tegra_spi_data *tspi;
1298 struct resource *r;
1299 int ret, spi_irq;
1300 int bus_num;
1301
1302 host = spi_alloc_host(&pdev->dev, sizeof(*tspi));
1303 if (!host) {
1304 dev_err(&pdev->dev, "host allocation failed\n");
1305 return -ENOMEM;
1306 }
1307 platform_set_drvdata(pdev, host);
1308 tspi = spi_controller_get_devdata(host);
1309
1310 if (of_property_read_u32(pdev->dev.of_node, "spi-max-frequency",
1311 &host->max_speed_hz))
1312 host->max_speed_hz = 25000000; /* 25MHz */
1313
1314 /* the spi->mode bits understood by this driver: */
1315 host->use_gpio_descriptors = true;
1316 host->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST |
1317 SPI_TX_DUAL | SPI_RX_DUAL | SPI_3WIRE;
1318 host->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
1319 host->setup = tegra_spi_setup;
1320 host->cleanup = tegra_spi_cleanup;
1321 host->transfer_one_message = tegra_spi_transfer_one_message;
1322 host->set_cs_timing = tegra_spi_set_hw_cs_timing;
1323 host->num_chipselect = MAX_CHIP_SELECT;
1324 host->auto_runtime_pm = true;
1325 bus_num = of_alias_get_id(pdev->dev.of_node, "spi");
1326 if (bus_num >= 0)
1327 host->bus_num = bus_num;
1328
1329 tspi->host = host;
1330 tspi->dev = &pdev->dev;
1331 spin_lock_init(&tspi->lock);
1332
1333 tspi->soc_data = of_device_get_match_data(&pdev->dev);
1334 if (!tspi->soc_data) {
1335 dev_err(&pdev->dev, "unsupported tegra\n");
1336 ret = -ENODEV;
1337 goto exit_free_host;
1338 }
1339
1340 tspi->base = devm_platform_get_and_ioremap_resource(pdev, 0, &r);
1341 if (IS_ERR(tspi->base)) {
1342 ret = PTR_ERR(tspi->base);
1343 goto exit_free_host;
1344 }
1345 tspi->phys = r->start;
1346
1347 spi_irq = platform_get_irq(pdev, 0);
1348 if (spi_irq < 0) {
1349 ret = spi_irq;
1350 goto exit_free_host;
1351 }
1352 tspi->irq = spi_irq;
1353
1354 tspi->clk = devm_clk_get(&pdev->dev, "spi");
1355 if (IS_ERR(tspi->clk)) {
1356 dev_err(&pdev->dev, "can not get clock\n");
1357 ret = PTR_ERR(tspi->clk);
1358 goto exit_free_host;
1359 }
1360
1361 tspi->rst = devm_reset_control_get_exclusive(&pdev->dev, "spi");
1362 if (IS_ERR(tspi->rst)) {
1363 dev_err(&pdev->dev, "can not get reset\n");
1364 ret = PTR_ERR(tspi->rst);
1365 goto exit_free_host;
1366 }
1367
1368 tspi->max_buf_size = SPI_FIFO_DEPTH << 2;
1369 tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN;
1370
1371 ret = tegra_spi_init_dma_param(tspi, true);
1372 if (ret < 0)
1373 goto exit_free_host;
1374 ret = tegra_spi_init_dma_param(tspi, false);
1375 if (ret < 0)
1376 goto exit_rx_dma_free;
1377 tspi->max_buf_size = tspi->dma_buf_size;
1378 init_completion(&tspi->tx_dma_complete);
1379 init_completion(&tspi->rx_dma_complete);
1380
1381 init_completion(&tspi->xfer_completion);
1382
1383 pm_runtime_enable(&pdev->dev);
1384 if (!pm_runtime_enabled(&pdev->dev)) {
1385 ret = tegra_spi_runtime_resume(&pdev->dev);
1386 if (ret)
1387 goto exit_pm_disable;
1388 }
1389
1390 ret = pm_runtime_resume_and_get(&pdev->dev);
1391 if (ret < 0) {
1392 dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret);
1393 goto exit_pm_disable;
1394 }
1395
1396 reset_control_assert(tspi->rst);
1397 udelay(2);
1398 reset_control_deassert(tspi->rst);
1399 tspi->def_command1_reg = SPI_M_S;
1400 tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1);
1401 tspi->spi_cs_timing1 = tegra_spi_readl(tspi, SPI_CS_TIMING1);
1402 tspi->spi_cs_timing2 = tegra_spi_readl(tspi, SPI_CS_TIMING2);
1403 tspi->def_command2_reg = tegra_spi_readl(tspi, SPI_COMMAND2);
1404 tspi->last_used_cs = host->num_chipselect + 1;
1405 pm_runtime_put(&pdev->dev);
1406 ret = request_threaded_irq(tspi->irq, tegra_spi_isr,
1407 tegra_spi_isr_thread, IRQF_ONESHOT,
1408 dev_name(&pdev->dev), tspi);
1409 if (ret < 0) {
1410 dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n",
1411 tspi->irq);
1412 goto exit_pm_disable;
1413 }
1414
1415 host->dev.of_node = pdev->dev.of_node;
1416 ret = devm_spi_register_controller(&pdev->dev, host);
1417 if (ret < 0) {
1418 dev_err(&pdev->dev, "can not register to host err %d\n", ret);
1419 goto exit_free_irq;
1420 }
1421 return ret;
1422
1423exit_free_irq:
1424 free_irq(spi_irq, tspi);
1425exit_pm_disable:
1426 pm_runtime_disable(&pdev->dev);
1427 if (!pm_runtime_status_suspended(&pdev->dev))
1428 tegra_spi_runtime_suspend(&pdev->dev);
1429 tegra_spi_deinit_dma_param(tspi, false);
1430exit_rx_dma_free:
1431 tegra_spi_deinit_dma_param(tspi, true);
1432exit_free_host:
1433 spi_controller_put(host);
1434 return ret;
1435}
1436
1437static void tegra_spi_remove(struct platform_device *pdev)
1438{
1439 struct spi_controller *host = platform_get_drvdata(pdev);
1440 struct tegra_spi_data *tspi = spi_controller_get_devdata(host);
1441
1442 free_irq(tspi->irq, tspi);
1443
1444 if (tspi->tx_dma_chan)
1445 tegra_spi_deinit_dma_param(tspi, false);
1446
1447 if (tspi->rx_dma_chan)
1448 tegra_spi_deinit_dma_param(tspi, true);
1449
1450 pm_runtime_disable(&pdev->dev);
1451 if (!pm_runtime_status_suspended(&pdev->dev))
1452 tegra_spi_runtime_suspend(&pdev->dev);
1453}
1454
1455#ifdef CONFIG_PM_SLEEP
1456static int tegra_spi_suspend(struct device *dev)
1457{
1458 struct spi_controller *host = dev_get_drvdata(dev);
1459
1460 return spi_controller_suspend(host);
1461}
1462
1463static int tegra_spi_resume(struct device *dev)
1464{
1465 struct spi_controller *host = dev_get_drvdata(dev);
1466 struct tegra_spi_data *tspi = spi_controller_get_devdata(host);
1467 int ret;
1468
1469 ret = pm_runtime_resume_and_get(dev);
1470 if (ret < 0) {
1471 dev_err(dev, "pm runtime failed, e = %d\n", ret);
1472 return ret;
1473 }
1474 tegra_spi_writel(tspi, tspi->command1_reg, SPI_COMMAND1);
1475 tegra_spi_writel(tspi, tspi->def_command2_reg, SPI_COMMAND2);
1476 tspi->last_used_cs = host->num_chipselect + 1;
1477 pm_runtime_put(dev);
1478
1479 return spi_controller_resume(host);
1480}
1481#endif
1482
1483static int tegra_spi_runtime_suspend(struct device *dev)
1484{
1485 struct spi_controller *host = dev_get_drvdata(dev);
1486 struct tegra_spi_data *tspi = spi_controller_get_devdata(host);
1487
1488 /* Flush all write which are in PPSB queue by reading back */
1489 tegra_spi_readl(tspi, SPI_COMMAND1);
1490
1491 clk_disable_unprepare(tspi->clk);
1492 return 0;
1493}
1494
1495static int tegra_spi_runtime_resume(struct device *dev)
1496{
1497 struct spi_controller *host = dev_get_drvdata(dev);
1498 struct tegra_spi_data *tspi = spi_controller_get_devdata(host);
1499 int ret;
1500
1501 ret = clk_prepare_enable(tspi->clk);
1502 if (ret < 0) {
1503 dev_err(tspi->dev, "clk_prepare failed: %d\n", ret);
1504 return ret;
1505 }
1506 return 0;
1507}
1508
1509static const struct dev_pm_ops tegra_spi_pm_ops = {
1510 SET_RUNTIME_PM_OPS(tegra_spi_runtime_suspend,
1511 tegra_spi_runtime_resume, NULL)
1512 SET_SYSTEM_SLEEP_PM_OPS(tegra_spi_suspend, tegra_spi_resume)
1513};
1514static struct platform_driver tegra_spi_driver = {
1515 .driver = {
1516 .name = "spi-tegra114",
1517 .pm = &tegra_spi_pm_ops,
1518 .of_match_table = tegra_spi_of_match,
1519 },
1520 .probe = tegra_spi_probe,
1521 .remove_new = tegra_spi_remove,
1522};
1523module_platform_driver(tegra_spi_driver);
1524
1525MODULE_ALIAS("platform:spi-tegra114");
1526MODULE_DESCRIPTION("NVIDIA Tegra114 SPI Controller Driver");
1527MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
1528MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * SPI driver for NVIDIA's Tegra114 SPI Controller.
4 *
5 * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
6 */
7
8#include <linux/clk.h>
9#include <linux/completion.h>
10#include <linux/delay.h>
11#include <linux/dmaengine.h>
12#include <linux/dma-mapping.h>
13#include <linux/dmapool.h>
14#include <linux/err.h>
15#include <linux/interrupt.h>
16#include <linux/io.h>
17#include <linux/kernel.h>
18#include <linux/kthread.h>
19#include <linux/module.h>
20#include <linux/platform_device.h>
21#include <linux/pm_runtime.h>
22#include <linux/of.h>
23#include <linux/of_device.h>
24#include <linux/reset.h>
25#include <linux/spi/spi.h>
26
27#define SPI_COMMAND1 0x000
28#define SPI_BIT_LENGTH(x) (((x) & 0x1f) << 0)
29#define SPI_PACKED (1 << 5)
30#define SPI_TX_EN (1 << 11)
31#define SPI_RX_EN (1 << 12)
32#define SPI_BOTH_EN_BYTE (1 << 13)
33#define SPI_BOTH_EN_BIT (1 << 14)
34#define SPI_LSBYTE_FE (1 << 15)
35#define SPI_LSBIT_FE (1 << 16)
36#define SPI_BIDIROE (1 << 17)
37#define SPI_IDLE_SDA_DRIVE_LOW (0 << 18)
38#define SPI_IDLE_SDA_DRIVE_HIGH (1 << 18)
39#define SPI_IDLE_SDA_PULL_LOW (2 << 18)
40#define SPI_IDLE_SDA_PULL_HIGH (3 << 18)
41#define SPI_IDLE_SDA_MASK (3 << 18)
42#define SPI_CS_SW_VAL (1 << 20)
43#define SPI_CS_SW_HW (1 << 21)
44/* SPI_CS_POL_INACTIVE bits are default high */
45 /* n from 0 to 3 */
46#define SPI_CS_POL_INACTIVE(n) (1 << (22 + (n)))
47#define SPI_CS_POL_INACTIVE_MASK (0xF << 22)
48
49#define SPI_CS_SEL_0 (0 << 26)
50#define SPI_CS_SEL_1 (1 << 26)
51#define SPI_CS_SEL_2 (2 << 26)
52#define SPI_CS_SEL_3 (3 << 26)
53#define SPI_CS_SEL_MASK (3 << 26)
54#define SPI_CS_SEL(x) (((x) & 0x3) << 26)
55#define SPI_CONTROL_MODE_0 (0 << 28)
56#define SPI_CONTROL_MODE_1 (1 << 28)
57#define SPI_CONTROL_MODE_2 (2 << 28)
58#define SPI_CONTROL_MODE_3 (3 << 28)
59#define SPI_CONTROL_MODE_MASK (3 << 28)
60#define SPI_MODE_SEL(x) (((x) & 0x3) << 28)
61#define SPI_M_S (1 << 30)
62#define SPI_PIO (1 << 31)
63
64#define SPI_COMMAND2 0x004
65#define SPI_TX_TAP_DELAY(x) (((x) & 0x3F) << 6)
66#define SPI_RX_TAP_DELAY(x) (((x) & 0x3F) << 0)
67
68#define SPI_CS_TIMING1 0x008
69#define SPI_SETUP_HOLD(setup, hold) (((setup) << 4) | (hold))
70#define SPI_CS_SETUP_HOLD(reg, cs, val) \
71 ((((val) & 0xFFu) << ((cs) * 8)) | \
72 ((reg) & ~(0xFFu << ((cs) * 8))))
73
74#define SPI_CS_TIMING2 0x00C
75#define CYCLES_BETWEEN_PACKETS_0(x) (((x) & 0x1F) << 0)
76#define CS_ACTIVE_BETWEEN_PACKETS_0 (1 << 5)
77#define CYCLES_BETWEEN_PACKETS_1(x) (((x) & 0x1F) << 8)
78#define CS_ACTIVE_BETWEEN_PACKETS_1 (1 << 13)
79#define CYCLES_BETWEEN_PACKETS_2(x) (((x) & 0x1F) << 16)
80#define CS_ACTIVE_BETWEEN_PACKETS_2 (1 << 21)
81#define CYCLES_BETWEEN_PACKETS_3(x) (((x) & 0x1F) << 24)
82#define CS_ACTIVE_BETWEEN_PACKETS_3 (1 << 29)
83#define SPI_SET_CS_ACTIVE_BETWEEN_PACKETS(reg, cs, val) \
84 (reg = (((val) & 0x1) << ((cs) * 8 + 5)) | \
85 ((reg) & ~(1 << ((cs) * 8 + 5))))
86#define SPI_SET_CYCLES_BETWEEN_PACKETS(reg, cs, val) \
87 (reg = (((val) & 0x1F) << ((cs) * 8)) | \
88 ((reg) & ~(0x1F << ((cs) * 8))))
89#define MAX_SETUP_HOLD_CYCLES 16
90#define MAX_INACTIVE_CYCLES 32
91
92#define SPI_TRANS_STATUS 0x010
93#define SPI_BLK_CNT(val) (((val) >> 0) & 0xFFFF)
94#define SPI_SLV_IDLE_COUNT(val) (((val) >> 16) & 0xFF)
95#define SPI_RDY (1 << 30)
96
97#define SPI_FIFO_STATUS 0x014
98#define SPI_RX_FIFO_EMPTY (1 << 0)
99#define SPI_RX_FIFO_FULL (1 << 1)
100#define SPI_TX_FIFO_EMPTY (1 << 2)
101#define SPI_TX_FIFO_FULL (1 << 3)
102#define SPI_RX_FIFO_UNF (1 << 4)
103#define SPI_RX_FIFO_OVF (1 << 5)
104#define SPI_TX_FIFO_UNF (1 << 6)
105#define SPI_TX_FIFO_OVF (1 << 7)
106#define SPI_ERR (1 << 8)
107#define SPI_TX_FIFO_FLUSH (1 << 14)
108#define SPI_RX_FIFO_FLUSH (1 << 15)
109#define SPI_TX_FIFO_EMPTY_COUNT(val) (((val) >> 16) & 0x7F)
110#define SPI_RX_FIFO_FULL_COUNT(val) (((val) >> 23) & 0x7F)
111#define SPI_FRAME_END (1 << 30)
112#define SPI_CS_INACTIVE (1 << 31)
113
114#define SPI_FIFO_ERROR (SPI_RX_FIFO_UNF | \
115 SPI_RX_FIFO_OVF | SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF)
116#define SPI_FIFO_EMPTY (SPI_RX_FIFO_EMPTY | SPI_TX_FIFO_EMPTY)
117
118#define SPI_TX_DATA 0x018
119#define SPI_RX_DATA 0x01C
120
121#define SPI_DMA_CTL 0x020
122#define SPI_TX_TRIG_1 (0 << 15)
123#define SPI_TX_TRIG_4 (1 << 15)
124#define SPI_TX_TRIG_8 (2 << 15)
125#define SPI_TX_TRIG_16 (3 << 15)
126#define SPI_TX_TRIG_MASK (3 << 15)
127#define SPI_RX_TRIG_1 (0 << 19)
128#define SPI_RX_TRIG_4 (1 << 19)
129#define SPI_RX_TRIG_8 (2 << 19)
130#define SPI_RX_TRIG_16 (3 << 19)
131#define SPI_RX_TRIG_MASK (3 << 19)
132#define SPI_IE_TX (1 << 28)
133#define SPI_IE_RX (1 << 29)
134#define SPI_CONT (1 << 30)
135#define SPI_DMA (1 << 31)
136#define SPI_DMA_EN SPI_DMA
137
138#define SPI_DMA_BLK 0x024
139#define SPI_DMA_BLK_SET(x) (((x) & 0xFFFF) << 0)
140
141#define SPI_TX_FIFO 0x108
142#define SPI_RX_FIFO 0x188
143#define SPI_INTR_MASK 0x18c
144#define SPI_INTR_ALL_MASK (0x1fUL << 25)
145#define MAX_CHIP_SELECT 4
146#define SPI_FIFO_DEPTH 64
147#define DATA_DIR_TX (1 << 0)
148#define DATA_DIR_RX (1 << 1)
149
150#define SPI_DMA_TIMEOUT (msecs_to_jiffies(1000))
151#define DEFAULT_SPI_DMA_BUF_LEN (16*1024)
152#define TX_FIFO_EMPTY_COUNT_MAX SPI_TX_FIFO_EMPTY_COUNT(0x40)
153#define RX_FIFO_FULL_COUNT_ZERO SPI_RX_FIFO_FULL_COUNT(0)
154#define MAX_HOLD_CYCLES 16
155#define SPI_DEFAULT_SPEED 25000000
156
157struct tegra_spi_soc_data {
158 bool has_intr_mask_reg;
159};
160
161struct tegra_spi_client_data {
162 int tx_clk_tap_delay;
163 int rx_clk_tap_delay;
164};
165
166struct tegra_spi_data {
167 struct device *dev;
168 struct spi_master *master;
169 spinlock_t lock;
170
171 struct clk *clk;
172 struct reset_control *rst;
173 void __iomem *base;
174 phys_addr_t phys;
175 unsigned irq;
176 u32 cur_speed;
177
178 struct spi_device *cur_spi;
179 struct spi_device *cs_control;
180 unsigned cur_pos;
181 unsigned words_per_32bit;
182 unsigned bytes_per_word;
183 unsigned curr_dma_words;
184 unsigned cur_direction;
185
186 unsigned cur_rx_pos;
187 unsigned cur_tx_pos;
188
189 unsigned dma_buf_size;
190 unsigned max_buf_size;
191 bool is_curr_dma_xfer;
192 bool use_hw_based_cs;
193
194 struct completion rx_dma_complete;
195 struct completion tx_dma_complete;
196
197 u32 tx_status;
198 u32 rx_status;
199 u32 status_reg;
200 bool is_packed;
201
202 u32 command1_reg;
203 u32 dma_control_reg;
204 u32 def_command1_reg;
205 u32 def_command2_reg;
206 u32 spi_cs_timing1;
207 u32 spi_cs_timing2;
208 u8 last_used_cs;
209
210 struct completion xfer_completion;
211 struct spi_transfer *curr_xfer;
212 struct dma_chan *rx_dma_chan;
213 u32 *rx_dma_buf;
214 dma_addr_t rx_dma_phys;
215 struct dma_async_tx_descriptor *rx_dma_desc;
216
217 struct dma_chan *tx_dma_chan;
218 u32 *tx_dma_buf;
219 dma_addr_t tx_dma_phys;
220 struct dma_async_tx_descriptor *tx_dma_desc;
221 const struct tegra_spi_soc_data *soc_data;
222};
223
224static int tegra_spi_runtime_suspend(struct device *dev);
225static int tegra_spi_runtime_resume(struct device *dev);
226
227static inline u32 tegra_spi_readl(struct tegra_spi_data *tspi,
228 unsigned long reg)
229{
230 return readl(tspi->base + reg);
231}
232
233static inline void tegra_spi_writel(struct tegra_spi_data *tspi,
234 u32 val, unsigned long reg)
235{
236 writel(val, tspi->base + reg);
237
238 /* Read back register to make sure that register writes completed */
239 if (reg != SPI_TX_FIFO)
240 readl(tspi->base + SPI_COMMAND1);
241}
242
243static void tegra_spi_clear_status(struct tegra_spi_data *tspi)
244{
245 u32 val;
246
247 /* Write 1 to clear status register */
248 val = tegra_spi_readl(tspi, SPI_TRANS_STATUS);
249 tegra_spi_writel(tspi, val, SPI_TRANS_STATUS);
250
251 /* Clear fifo status error if any */
252 val = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
253 if (val & SPI_ERR)
254 tegra_spi_writel(tspi, SPI_ERR | SPI_FIFO_ERROR,
255 SPI_FIFO_STATUS);
256}
257
258static unsigned tegra_spi_calculate_curr_xfer_param(
259 struct spi_device *spi, struct tegra_spi_data *tspi,
260 struct spi_transfer *t)
261{
262 unsigned remain_len = t->len - tspi->cur_pos;
263 unsigned max_word;
264 unsigned bits_per_word = t->bits_per_word;
265 unsigned max_len;
266 unsigned total_fifo_words;
267
268 tspi->bytes_per_word = DIV_ROUND_UP(bits_per_word, 8);
269
270 if ((bits_per_word == 8 || bits_per_word == 16 ||
271 bits_per_word == 32) && t->len > 3) {
272 tspi->is_packed = true;
273 tspi->words_per_32bit = 32/bits_per_word;
274 } else {
275 tspi->is_packed = false;
276 tspi->words_per_32bit = 1;
277 }
278
279 if (tspi->is_packed) {
280 max_len = min(remain_len, tspi->max_buf_size);
281 tspi->curr_dma_words = max_len/tspi->bytes_per_word;
282 total_fifo_words = (max_len + 3) / 4;
283 } else {
284 max_word = (remain_len - 1) / tspi->bytes_per_word + 1;
285 max_word = min(max_word, tspi->max_buf_size/4);
286 tspi->curr_dma_words = max_word;
287 total_fifo_words = max_word;
288 }
289 return total_fifo_words;
290}
291
292static unsigned tegra_spi_fill_tx_fifo_from_client_txbuf(
293 struct tegra_spi_data *tspi, struct spi_transfer *t)
294{
295 unsigned nbytes;
296 unsigned tx_empty_count;
297 u32 fifo_status;
298 unsigned max_n_32bit;
299 unsigned i, count;
300 unsigned int written_words;
301 unsigned fifo_words_left;
302 u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos;
303
304 fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
305 tx_empty_count = SPI_TX_FIFO_EMPTY_COUNT(fifo_status);
306
307 if (tspi->is_packed) {
308 fifo_words_left = tx_empty_count * tspi->words_per_32bit;
309 written_words = min(fifo_words_left, tspi->curr_dma_words);
310 nbytes = written_words * tspi->bytes_per_word;
311 max_n_32bit = DIV_ROUND_UP(nbytes, 4);
312 for (count = 0; count < max_n_32bit; count++) {
313 u32 x = 0;
314
315 for (i = 0; (i < 4) && nbytes; i++, nbytes--)
316 x |= (u32)(*tx_buf++) << (i * 8);
317 tegra_spi_writel(tspi, x, SPI_TX_FIFO);
318 }
319
320 tspi->cur_tx_pos += written_words * tspi->bytes_per_word;
321 } else {
322 unsigned int write_bytes;
323 max_n_32bit = min(tspi->curr_dma_words, tx_empty_count);
324 written_words = max_n_32bit;
325 nbytes = written_words * tspi->bytes_per_word;
326 if (nbytes > t->len - tspi->cur_pos)
327 nbytes = t->len - tspi->cur_pos;
328 write_bytes = nbytes;
329 for (count = 0; count < max_n_32bit; count++) {
330 u32 x = 0;
331
332 for (i = 0; nbytes && (i < tspi->bytes_per_word);
333 i++, nbytes--)
334 x |= (u32)(*tx_buf++) << (i * 8);
335 tegra_spi_writel(tspi, x, SPI_TX_FIFO);
336 }
337
338 tspi->cur_tx_pos += write_bytes;
339 }
340
341 return written_words;
342}
343
344static unsigned int tegra_spi_read_rx_fifo_to_client_rxbuf(
345 struct tegra_spi_data *tspi, struct spi_transfer *t)
346{
347 unsigned rx_full_count;
348 u32 fifo_status;
349 unsigned i, count;
350 unsigned int read_words = 0;
351 unsigned len;
352 u8 *rx_buf = (u8 *)t->rx_buf + tspi->cur_rx_pos;
353
354 fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
355 rx_full_count = SPI_RX_FIFO_FULL_COUNT(fifo_status);
356 if (tspi->is_packed) {
357 len = tspi->curr_dma_words * tspi->bytes_per_word;
358 for (count = 0; count < rx_full_count; count++) {
359 u32 x = tegra_spi_readl(tspi, SPI_RX_FIFO);
360
361 for (i = 0; len && (i < 4); i++, len--)
362 *rx_buf++ = (x >> i*8) & 0xFF;
363 }
364 read_words += tspi->curr_dma_words;
365 tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word;
366 } else {
367 u32 rx_mask = ((u32)1 << t->bits_per_word) - 1;
368 u8 bytes_per_word = tspi->bytes_per_word;
369 unsigned int read_bytes;
370
371 len = rx_full_count * bytes_per_word;
372 if (len > t->len - tspi->cur_pos)
373 len = t->len - tspi->cur_pos;
374 read_bytes = len;
375 for (count = 0; count < rx_full_count; count++) {
376 u32 x = tegra_spi_readl(tspi, SPI_RX_FIFO) & rx_mask;
377
378 for (i = 0; len && (i < bytes_per_word); i++, len--)
379 *rx_buf++ = (x >> (i*8)) & 0xFF;
380 }
381 read_words += rx_full_count;
382 tspi->cur_rx_pos += read_bytes;
383 }
384
385 return read_words;
386}
387
388static void tegra_spi_copy_client_txbuf_to_spi_txbuf(
389 struct tegra_spi_data *tspi, struct spi_transfer *t)
390{
391 /* Make the dma buffer to read by cpu */
392 dma_sync_single_for_cpu(tspi->dev, tspi->tx_dma_phys,
393 tspi->dma_buf_size, DMA_TO_DEVICE);
394
395 if (tspi->is_packed) {
396 unsigned len = tspi->curr_dma_words * tspi->bytes_per_word;
397
398 memcpy(tspi->tx_dma_buf, t->tx_buf + tspi->cur_pos, len);
399 tspi->cur_tx_pos += tspi->curr_dma_words * tspi->bytes_per_word;
400 } else {
401 unsigned int i;
402 unsigned int count;
403 u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos;
404 unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word;
405 unsigned int write_bytes;
406
407 if (consume > t->len - tspi->cur_pos)
408 consume = t->len - tspi->cur_pos;
409 write_bytes = consume;
410 for (count = 0; count < tspi->curr_dma_words; count++) {
411 u32 x = 0;
412
413 for (i = 0; consume && (i < tspi->bytes_per_word);
414 i++, consume--)
415 x |= (u32)(*tx_buf++) << (i * 8);
416 tspi->tx_dma_buf[count] = x;
417 }
418
419 tspi->cur_tx_pos += write_bytes;
420 }
421
422 /* Make the dma buffer to read by dma */
423 dma_sync_single_for_device(tspi->dev, tspi->tx_dma_phys,
424 tspi->dma_buf_size, DMA_TO_DEVICE);
425}
426
427static void tegra_spi_copy_spi_rxbuf_to_client_rxbuf(
428 struct tegra_spi_data *tspi, struct spi_transfer *t)
429{
430 /* Make the dma buffer to read by cpu */
431 dma_sync_single_for_cpu(tspi->dev, tspi->rx_dma_phys,
432 tspi->dma_buf_size, DMA_FROM_DEVICE);
433
434 if (tspi->is_packed) {
435 unsigned len = tspi->curr_dma_words * tspi->bytes_per_word;
436
437 memcpy(t->rx_buf + tspi->cur_rx_pos, tspi->rx_dma_buf, len);
438 tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word;
439 } else {
440 unsigned int i;
441 unsigned int count;
442 unsigned char *rx_buf = t->rx_buf + tspi->cur_rx_pos;
443 u32 rx_mask = ((u32)1 << t->bits_per_word) - 1;
444 unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word;
445 unsigned int read_bytes;
446
447 if (consume > t->len - tspi->cur_pos)
448 consume = t->len - tspi->cur_pos;
449 read_bytes = consume;
450 for (count = 0; count < tspi->curr_dma_words; count++) {
451 u32 x = tspi->rx_dma_buf[count] & rx_mask;
452
453 for (i = 0; consume && (i < tspi->bytes_per_word);
454 i++, consume--)
455 *rx_buf++ = (x >> (i*8)) & 0xFF;
456 }
457
458 tspi->cur_rx_pos += read_bytes;
459 }
460
461 /* Make the dma buffer to read by dma */
462 dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys,
463 tspi->dma_buf_size, DMA_FROM_DEVICE);
464}
465
466static void tegra_spi_dma_complete(void *args)
467{
468 struct completion *dma_complete = args;
469
470 complete(dma_complete);
471}
472
473static int tegra_spi_start_tx_dma(struct tegra_spi_data *tspi, int len)
474{
475 reinit_completion(&tspi->tx_dma_complete);
476 tspi->tx_dma_desc = dmaengine_prep_slave_single(tspi->tx_dma_chan,
477 tspi->tx_dma_phys, len, DMA_MEM_TO_DEV,
478 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
479 if (!tspi->tx_dma_desc) {
480 dev_err(tspi->dev, "Not able to get desc for Tx\n");
481 return -EIO;
482 }
483
484 tspi->tx_dma_desc->callback = tegra_spi_dma_complete;
485 tspi->tx_dma_desc->callback_param = &tspi->tx_dma_complete;
486
487 dmaengine_submit(tspi->tx_dma_desc);
488 dma_async_issue_pending(tspi->tx_dma_chan);
489 return 0;
490}
491
492static int tegra_spi_start_rx_dma(struct tegra_spi_data *tspi, int len)
493{
494 reinit_completion(&tspi->rx_dma_complete);
495 tspi->rx_dma_desc = dmaengine_prep_slave_single(tspi->rx_dma_chan,
496 tspi->rx_dma_phys, len, DMA_DEV_TO_MEM,
497 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
498 if (!tspi->rx_dma_desc) {
499 dev_err(tspi->dev, "Not able to get desc for Rx\n");
500 return -EIO;
501 }
502
503 tspi->rx_dma_desc->callback = tegra_spi_dma_complete;
504 tspi->rx_dma_desc->callback_param = &tspi->rx_dma_complete;
505
506 dmaengine_submit(tspi->rx_dma_desc);
507 dma_async_issue_pending(tspi->rx_dma_chan);
508 return 0;
509}
510
511static int tegra_spi_flush_fifos(struct tegra_spi_data *tspi)
512{
513 unsigned long timeout = jiffies + HZ;
514 u32 status;
515
516 status = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
517 if ((status & SPI_FIFO_EMPTY) != SPI_FIFO_EMPTY) {
518 status |= SPI_RX_FIFO_FLUSH | SPI_TX_FIFO_FLUSH;
519 tegra_spi_writel(tspi, status, SPI_FIFO_STATUS);
520 while ((status & SPI_FIFO_EMPTY) != SPI_FIFO_EMPTY) {
521 status = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
522 if (time_after(jiffies, timeout)) {
523 dev_err(tspi->dev,
524 "timeout waiting for fifo flush\n");
525 return -EIO;
526 }
527
528 udelay(1);
529 }
530 }
531
532 return 0;
533}
534
535static int tegra_spi_start_dma_based_transfer(
536 struct tegra_spi_data *tspi, struct spi_transfer *t)
537{
538 u32 val;
539 unsigned int len;
540 int ret = 0;
541 u8 dma_burst;
542 struct dma_slave_config dma_sconfig = {0};
543
544 val = SPI_DMA_BLK_SET(tspi->curr_dma_words - 1);
545 tegra_spi_writel(tspi, val, SPI_DMA_BLK);
546
547 if (tspi->is_packed)
548 len = DIV_ROUND_UP(tspi->curr_dma_words * tspi->bytes_per_word,
549 4) * 4;
550 else
551 len = tspi->curr_dma_words * 4;
552
553 /* Set attention level based on length of transfer */
554 if (len & 0xF) {
555 val |= SPI_TX_TRIG_1 | SPI_RX_TRIG_1;
556 dma_burst = 1;
557 } else if (((len) >> 4) & 0x1) {
558 val |= SPI_TX_TRIG_4 | SPI_RX_TRIG_4;
559 dma_burst = 4;
560 } else {
561 val |= SPI_TX_TRIG_8 | SPI_RX_TRIG_8;
562 dma_burst = 8;
563 }
564
565 if (!tspi->soc_data->has_intr_mask_reg) {
566 if (tspi->cur_direction & DATA_DIR_TX)
567 val |= SPI_IE_TX;
568
569 if (tspi->cur_direction & DATA_DIR_RX)
570 val |= SPI_IE_RX;
571 }
572
573 tegra_spi_writel(tspi, val, SPI_DMA_CTL);
574 tspi->dma_control_reg = val;
575
576 dma_sconfig.device_fc = true;
577 if (tspi->cur_direction & DATA_DIR_TX) {
578 dma_sconfig.dst_addr = tspi->phys + SPI_TX_FIFO;
579 dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
580 dma_sconfig.dst_maxburst = dma_burst;
581 ret = dmaengine_slave_config(tspi->tx_dma_chan, &dma_sconfig);
582 if (ret < 0) {
583 dev_err(tspi->dev,
584 "DMA slave config failed: %d\n", ret);
585 return ret;
586 }
587
588 tegra_spi_copy_client_txbuf_to_spi_txbuf(tspi, t);
589 ret = tegra_spi_start_tx_dma(tspi, len);
590 if (ret < 0) {
591 dev_err(tspi->dev,
592 "Starting tx dma failed, err %d\n", ret);
593 return ret;
594 }
595 }
596
597 if (tspi->cur_direction & DATA_DIR_RX) {
598 dma_sconfig.src_addr = tspi->phys + SPI_RX_FIFO;
599 dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
600 dma_sconfig.src_maxburst = dma_burst;
601 ret = dmaengine_slave_config(tspi->rx_dma_chan, &dma_sconfig);
602 if (ret < 0) {
603 dev_err(tspi->dev,
604 "DMA slave config failed: %d\n", ret);
605 return ret;
606 }
607
608 /* Make the dma buffer to read by dma */
609 dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys,
610 tspi->dma_buf_size, DMA_FROM_DEVICE);
611
612 ret = tegra_spi_start_rx_dma(tspi, len);
613 if (ret < 0) {
614 dev_err(tspi->dev,
615 "Starting rx dma failed, err %d\n", ret);
616 if (tspi->cur_direction & DATA_DIR_TX)
617 dmaengine_terminate_all(tspi->tx_dma_chan);
618 return ret;
619 }
620 }
621 tspi->is_curr_dma_xfer = true;
622 tspi->dma_control_reg = val;
623
624 val |= SPI_DMA_EN;
625 tegra_spi_writel(tspi, val, SPI_DMA_CTL);
626 return ret;
627}
628
629static int tegra_spi_start_cpu_based_transfer(
630 struct tegra_spi_data *tspi, struct spi_transfer *t)
631{
632 u32 val;
633 unsigned cur_words;
634
635 if (tspi->cur_direction & DATA_DIR_TX)
636 cur_words = tegra_spi_fill_tx_fifo_from_client_txbuf(tspi, t);
637 else
638 cur_words = tspi->curr_dma_words;
639
640 val = SPI_DMA_BLK_SET(cur_words - 1);
641 tegra_spi_writel(tspi, val, SPI_DMA_BLK);
642
643 val = 0;
644 if (tspi->cur_direction & DATA_DIR_TX)
645 val |= SPI_IE_TX;
646
647 if (tspi->cur_direction & DATA_DIR_RX)
648 val |= SPI_IE_RX;
649
650 tegra_spi_writel(tspi, val, SPI_DMA_CTL);
651 tspi->dma_control_reg = val;
652
653 tspi->is_curr_dma_xfer = false;
654
655 val = tspi->command1_reg;
656 val |= SPI_PIO;
657 tegra_spi_writel(tspi, val, SPI_COMMAND1);
658 return 0;
659}
660
661static int tegra_spi_init_dma_param(struct tegra_spi_data *tspi,
662 bool dma_to_memory)
663{
664 struct dma_chan *dma_chan;
665 u32 *dma_buf;
666 dma_addr_t dma_phys;
667 int ret;
668
669 dma_chan = dma_request_chan(tspi->dev, dma_to_memory ? "rx" : "tx");
670 if (IS_ERR(dma_chan)) {
671 ret = PTR_ERR(dma_chan);
672 if (ret != -EPROBE_DEFER)
673 dev_err(tspi->dev,
674 "Dma channel is not available: %d\n", ret);
675 return ret;
676 }
677
678 dma_buf = dma_alloc_coherent(tspi->dev, tspi->dma_buf_size,
679 &dma_phys, GFP_KERNEL);
680 if (!dma_buf) {
681 dev_err(tspi->dev, " Not able to allocate the dma buffer\n");
682 dma_release_channel(dma_chan);
683 return -ENOMEM;
684 }
685
686 if (dma_to_memory) {
687 tspi->rx_dma_chan = dma_chan;
688 tspi->rx_dma_buf = dma_buf;
689 tspi->rx_dma_phys = dma_phys;
690 } else {
691 tspi->tx_dma_chan = dma_chan;
692 tspi->tx_dma_buf = dma_buf;
693 tspi->tx_dma_phys = dma_phys;
694 }
695 return 0;
696}
697
698static void tegra_spi_deinit_dma_param(struct tegra_spi_data *tspi,
699 bool dma_to_memory)
700{
701 u32 *dma_buf;
702 dma_addr_t dma_phys;
703 struct dma_chan *dma_chan;
704
705 if (dma_to_memory) {
706 dma_buf = tspi->rx_dma_buf;
707 dma_chan = tspi->rx_dma_chan;
708 dma_phys = tspi->rx_dma_phys;
709 tspi->rx_dma_chan = NULL;
710 tspi->rx_dma_buf = NULL;
711 } else {
712 dma_buf = tspi->tx_dma_buf;
713 dma_chan = tspi->tx_dma_chan;
714 dma_phys = tspi->tx_dma_phys;
715 tspi->tx_dma_buf = NULL;
716 tspi->tx_dma_chan = NULL;
717 }
718 if (!dma_chan)
719 return;
720
721 dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys);
722 dma_release_channel(dma_chan);
723}
724
725static int tegra_spi_set_hw_cs_timing(struct spi_device *spi,
726 struct spi_delay *setup,
727 struct spi_delay *hold,
728 struct spi_delay *inactive)
729{
730 struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
731 u8 setup_dly, hold_dly, inactive_dly;
732 u32 setup_hold;
733 u32 spi_cs_timing;
734 u32 inactive_cycles;
735 u8 cs_state;
736
737 if ((setup && setup->unit != SPI_DELAY_UNIT_SCK) ||
738 (hold && hold->unit != SPI_DELAY_UNIT_SCK) ||
739 (inactive && inactive->unit != SPI_DELAY_UNIT_SCK)) {
740 dev_err(&spi->dev,
741 "Invalid delay unit %d, should be SPI_DELAY_UNIT_SCK\n",
742 SPI_DELAY_UNIT_SCK);
743 return -EINVAL;
744 }
745
746 setup_dly = setup ? setup->value : 0;
747 hold_dly = hold ? hold->value : 0;
748 inactive_dly = inactive ? inactive->value : 0;
749
750 setup_dly = min_t(u8, setup_dly, MAX_SETUP_HOLD_CYCLES);
751 hold_dly = min_t(u8, hold_dly, MAX_SETUP_HOLD_CYCLES);
752 if (setup_dly && hold_dly) {
753 setup_hold = SPI_SETUP_HOLD(setup_dly - 1, hold_dly - 1);
754 spi_cs_timing = SPI_CS_SETUP_HOLD(tspi->spi_cs_timing1,
755 spi->chip_select,
756 setup_hold);
757 if (tspi->spi_cs_timing1 != spi_cs_timing) {
758 tspi->spi_cs_timing1 = spi_cs_timing;
759 tegra_spi_writel(tspi, spi_cs_timing, SPI_CS_TIMING1);
760 }
761 }
762
763 inactive_cycles = min_t(u8, inactive_dly, MAX_INACTIVE_CYCLES);
764 if (inactive_cycles)
765 inactive_cycles--;
766 cs_state = inactive_cycles ? 0 : 1;
767 spi_cs_timing = tspi->spi_cs_timing2;
768 SPI_SET_CS_ACTIVE_BETWEEN_PACKETS(spi_cs_timing, spi->chip_select,
769 cs_state);
770 SPI_SET_CYCLES_BETWEEN_PACKETS(spi_cs_timing, spi->chip_select,
771 inactive_cycles);
772 if (tspi->spi_cs_timing2 != spi_cs_timing) {
773 tspi->spi_cs_timing2 = spi_cs_timing;
774 tegra_spi_writel(tspi, spi_cs_timing, SPI_CS_TIMING2);
775 }
776
777 return 0;
778}
779
780static u32 tegra_spi_setup_transfer_one(struct spi_device *spi,
781 struct spi_transfer *t,
782 bool is_first_of_msg,
783 bool is_single_xfer)
784{
785 struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
786 struct tegra_spi_client_data *cdata = spi->controller_data;
787 u32 speed = t->speed_hz;
788 u8 bits_per_word = t->bits_per_word;
789 u32 command1, command2;
790 int req_mode;
791 u32 tx_tap = 0, rx_tap = 0;
792
793 if (speed != tspi->cur_speed) {
794 clk_set_rate(tspi->clk, speed);
795 tspi->cur_speed = speed;
796 }
797
798 tspi->cur_spi = spi;
799 tspi->cur_pos = 0;
800 tspi->cur_rx_pos = 0;
801 tspi->cur_tx_pos = 0;
802 tspi->curr_xfer = t;
803
804 if (is_first_of_msg) {
805 tegra_spi_clear_status(tspi);
806
807 command1 = tspi->def_command1_reg;
808 command1 |= SPI_BIT_LENGTH(bits_per_word - 1);
809
810 command1 &= ~SPI_CONTROL_MODE_MASK;
811 req_mode = spi->mode & 0x3;
812 if (req_mode == SPI_MODE_0)
813 command1 |= SPI_CONTROL_MODE_0;
814 else if (req_mode == SPI_MODE_1)
815 command1 |= SPI_CONTROL_MODE_1;
816 else if (req_mode == SPI_MODE_2)
817 command1 |= SPI_CONTROL_MODE_2;
818 else if (req_mode == SPI_MODE_3)
819 command1 |= SPI_CONTROL_MODE_3;
820
821 if (spi->mode & SPI_LSB_FIRST)
822 command1 |= SPI_LSBIT_FE;
823 else
824 command1 &= ~SPI_LSBIT_FE;
825
826 if (spi->mode & SPI_3WIRE)
827 command1 |= SPI_BIDIROE;
828 else
829 command1 &= ~SPI_BIDIROE;
830
831 if (tspi->cs_control) {
832 if (tspi->cs_control != spi)
833 tegra_spi_writel(tspi, command1, SPI_COMMAND1);
834 tspi->cs_control = NULL;
835 } else
836 tegra_spi_writel(tspi, command1, SPI_COMMAND1);
837
838 /* GPIO based chip select control */
839 if (spi->cs_gpiod)
840 gpiod_set_value(spi->cs_gpiod, 1);
841
842 if (is_single_xfer && !(t->cs_change)) {
843 tspi->use_hw_based_cs = true;
844 command1 &= ~(SPI_CS_SW_HW | SPI_CS_SW_VAL);
845 } else {
846 tspi->use_hw_based_cs = false;
847 command1 |= SPI_CS_SW_HW;
848 if (spi->mode & SPI_CS_HIGH)
849 command1 |= SPI_CS_SW_VAL;
850 else
851 command1 &= ~SPI_CS_SW_VAL;
852 }
853
854 if (tspi->last_used_cs != spi->chip_select) {
855 if (cdata && cdata->tx_clk_tap_delay)
856 tx_tap = cdata->tx_clk_tap_delay;
857 if (cdata && cdata->rx_clk_tap_delay)
858 rx_tap = cdata->rx_clk_tap_delay;
859 command2 = SPI_TX_TAP_DELAY(tx_tap) |
860 SPI_RX_TAP_DELAY(rx_tap);
861 if (command2 != tspi->def_command2_reg)
862 tegra_spi_writel(tspi, command2, SPI_COMMAND2);
863 tspi->last_used_cs = spi->chip_select;
864 }
865
866 } else {
867 command1 = tspi->command1_reg;
868 command1 &= ~SPI_BIT_LENGTH(~0);
869 command1 |= SPI_BIT_LENGTH(bits_per_word - 1);
870 }
871
872 return command1;
873}
874
875static int tegra_spi_start_transfer_one(struct spi_device *spi,
876 struct spi_transfer *t, u32 command1)
877{
878 struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
879 unsigned total_fifo_words;
880 int ret;
881
882 total_fifo_words = tegra_spi_calculate_curr_xfer_param(spi, tspi, t);
883
884 if (t->rx_nbits == SPI_NBITS_DUAL || t->tx_nbits == SPI_NBITS_DUAL)
885 command1 |= SPI_BOTH_EN_BIT;
886 else
887 command1 &= ~SPI_BOTH_EN_BIT;
888
889 if (tspi->is_packed)
890 command1 |= SPI_PACKED;
891 else
892 command1 &= ~SPI_PACKED;
893
894 command1 &= ~(SPI_CS_SEL_MASK | SPI_TX_EN | SPI_RX_EN);
895 tspi->cur_direction = 0;
896 if (t->rx_buf) {
897 command1 |= SPI_RX_EN;
898 tspi->cur_direction |= DATA_DIR_RX;
899 }
900 if (t->tx_buf) {
901 command1 |= SPI_TX_EN;
902 tspi->cur_direction |= DATA_DIR_TX;
903 }
904 command1 |= SPI_CS_SEL(spi->chip_select);
905 tegra_spi_writel(tspi, command1, SPI_COMMAND1);
906 tspi->command1_reg = command1;
907
908 dev_dbg(tspi->dev, "The def 0x%x and written 0x%x\n",
909 tspi->def_command1_reg, (unsigned)command1);
910
911 ret = tegra_spi_flush_fifos(tspi);
912 if (ret < 0)
913 return ret;
914 if (total_fifo_words > SPI_FIFO_DEPTH)
915 ret = tegra_spi_start_dma_based_transfer(tspi, t);
916 else
917 ret = tegra_spi_start_cpu_based_transfer(tspi, t);
918 return ret;
919}
920
921static struct tegra_spi_client_data
922 *tegra_spi_parse_cdata_dt(struct spi_device *spi)
923{
924 struct tegra_spi_client_data *cdata;
925 struct device_node *slave_np;
926
927 slave_np = spi->dev.of_node;
928 if (!slave_np) {
929 dev_dbg(&spi->dev, "device node not found\n");
930 return NULL;
931 }
932
933 cdata = kzalloc(sizeof(*cdata), GFP_KERNEL);
934 if (!cdata)
935 return NULL;
936
937 of_property_read_u32(slave_np, "nvidia,tx-clk-tap-delay",
938 &cdata->tx_clk_tap_delay);
939 of_property_read_u32(slave_np, "nvidia,rx-clk-tap-delay",
940 &cdata->rx_clk_tap_delay);
941 return cdata;
942}
943
944static void tegra_spi_cleanup(struct spi_device *spi)
945{
946 struct tegra_spi_client_data *cdata = spi->controller_data;
947
948 spi->controller_data = NULL;
949 if (spi->dev.of_node)
950 kfree(cdata);
951}
952
953static int tegra_spi_setup(struct spi_device *spi)
954{
955 struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
956 struct tegra_spi_client_data *cdata = spi->controller_data;
957 u32 val;
958 unsigned long flags;
959 int ret;
960
961 dev_dbg(&spi->dev, "setup %d bpw, %scpol, %scpha, %dHz\n",
962 spi->bits_per_word,
963 spi->mode & SPI_CPOL ? "" : "~",
964 spi->mode & SPI_CPHA ? "" : "~",
965 spi->max_speed_hz);
966
967 if (!cdata) {
968 cdata = tegra_spi_parse_cdata_dt(spi);
969 spi->controller_data = cdata;
970 }
971
972 ret = pm_runtime_get_sync(tspi->dev);
973 if (ret < 0) {
974 dev_err(tspi->dev, "pm runtime failed, e = %d\n", ret);
975 if (cdata)
976 tegra_spi_cleanup(spi);
977 return ret;
978 }
979
980 if (tspi->soc_data->has_intr_mask_reg) {
981 val = tegra_spi_readl(tspi, SPI_INTR_MASK);
982 val &= ~SPI_INTR_ALL_MASK;
983 tegra_spi_writel(tspi, val, SPI_INTR_MASK);
984 }
985
986 spin_lock_irqsave(&tspi->lock, flags);
987 /* GPIO based chip select control */
988 if (spi->cs_gpiod)
989 gpiod_set_value(spi->cs_gpiod, 0);
990
991 val = tspi->def_command1_reg;
992 if (spi->mode & SPI_CS_HIGH)
993 val &= ~SPI_CS_POL_INACTIVE(spi->chip_select);
994 else
995 val |= SPI_CS_POL_INACTIVE(spi->chip_select);
996 tspi->def_command1_reg = val;
997 tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1);
998 spin_unlock_irqrestore(&tspi->lock, flags);
999
1000 pm_runtime_put(tspi->dev);
1001 return 0;
1002}
1003
1004static void tegra_spi_transfer_end(struct spi_device *spi)
1005{
1006 struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
1007 int cs_val = (spi->mode & SPI_CS_HIGH) ? 0 : 1;
1008
1009 /* GPIO based chip select control */
1010 if (spi->cs_gpiod)
1011 gpiod_set_value(spi->cs_gpiod, 0);
1012
1013 if (!tspi->use_hw_based_cs) {
1014 if (cs_val)
1015 tspi->command1_reg |= SPI_CS_SW_VAL;
1016 else
1017 tspi->command1_reg &= ~SPI_CS_SW_VAL;
1018 tegra_spi_writel(tspi, tspi->command1_reg, SPI_COMMAND1);
1019 }
1020
1021 tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1);
1022}
1023
1024static void tegra_spi_dump_regs(struct tegra_spi_data *tspi)
1025{
1026 dev_dbg(tspi->dev, "============ SPI REGISTER DUMP ============\n");
1027 dev_dbg(tspi->dev, "Command1: 0x%08x | Command2: 0x%08x\n",
1028 tegra_spi_readl(tspi, SPI_COMMAND1),
1029 tegra_spi_readl(tspi, SPI_COMMAND2));
1030 dev_dbg(tspi->dev, "DMA_CTL: 0x%08x | DMA_BLK: 0x%08x\n",
1031 tegra_spi_readl(tspi, SPI_DMA_CTL),
1032 tegra_spi_readl(tspi, SPI_DMA_BLK));
1033 dev_dbg(tspi->dev, "TRANS_STAT: 0x%08x | FIFO_STATUS: 0x%08x\n",
1034 tegra_spi_readl(tspi, SPI_TRANS_STATUS),
1035 tegra_spi_readl(tspi, SPI_FIFO_STATUS));
1036}
1037
1038static int tegra_spi_transfer_one_message(struct spi_master *master,
1039 struct spi_message *msg)
1040{
1041 bool is_first_msg = true;
1042 struct tegra_spi_data *tspi = spi_master_get_devdata(master);
1043 struct spi_transfer *xfer;
1044 struct spi_device *spi = msg->spi;
1045 int ret;
1046 bool skip = false;
1047 int single_xfer;
1048
1049 msg->status = 0;
1050 msg->actual_length = 0;
1051
1052 single_xfer = list_is_singular(&msg->transfers);
1053 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
1054 u32 cmd1;
1055
1056 reinit_completion(&tspi->xfer_completion);
1057
1058 cmd1 = tegra_spi_setup_transfer_one(spi, xfer, is_first_msg,
1059 single_xfer);
1060
1061 if (!xfer->len) {
1062 ret = 0;
1063 skip = true;
1064 goto complete_xfer;
1065 }
1066
1067 ret = tegra_spi_start_transfer_one(spi, xfer, cmd1);
1068 if (ret < 0) {
1069 dev_err(tspi->dev,
1070 "spi can not start transfer, err %d\n", ret);
1071 goto complete_xfer;
1072 }
1073
1074 is_first_msg = false;
1075 ret = wait_for_completion_timeout(&tspi->xfer_completion,
1076 SPI_DMA_TIMEOUT);
1077 if (WARN_ON(ret == 0)) {
1078 dev_err(tspi->dev,
1079 "spi transfer timeout, err %d\n", ret);
1080 if (tspi->is_curr_dma_xfer &&
1081 (tspi->cur_direction & DATA_DIR_TX))
1082 dmaengine_terminate_all(tspi->tx_dma_chan);
1083 if (tspi->is_curr_dma_xfer &&
1084 (tspi->cur_direction & DATA_DIR_RX))
1085 dmaengine_terminate_all(tspi->rx_dma_chan);
1086 ret = -EIO;
1087 tegra_spi_dump_regs(tspi);
1088 tegra_spi_flush_fifos(tspi);
1089 reset_control_assert(tspi->rst);
1090 udelay(2);
1091 reset_control_deassert(tspi->rst);
1092 tspi->last_used_cs = master->num_chipselect + 1;
1093 goto complete_xfer;
1094 }
1095
1096 if (tspi->tx_status || tspi->rx_status) {
1097 dev_err(tspi->dev, "Error in Transfer\n");
1098 ret = -EIO;
1099 tegra_spi_dump_regs(tspi);
1100 goto complete_xfer;
1101 }
1102 msg->actual_length += xfer->len;
1103
1104complete_xfer:
1105 if (ret < 0 || skip) {
1106 tegra_spi_transfer_end(spi);
1107 spi_transfer_delay_exec(xfer);
1108 goto exit;
1109 } else if (list_is_last(&xfer->transfer_list,
1110 &msg->transfers)) {
1111 if (xfer->cs_change)
1112 tspi->cs_control = spi;
1113 else {
1114 tegra_spi_transfer_end(spi);
1115 spi_transfer_delay_exec(xfer);
1116 }
1117 } else if (xfer->cs_change) {
1118 tegra_spi_transfer_end(spi);
1119 spi_transfer_delay_exec(xfer);
1120 }
1121
1122 }
1123 ret = 0;
1124exit:
1125 msg->status = ret;
1126 spi_finalize_current_message(master);
1127 return ret;
1128}
1129
1130static irqreturn_t handle_cpu_based_xfer(struct tegra_spi_data *tspi)
1131{
1132 struct spi_transfer *t = tspi->curr_xfer;
1133 unsigned long flags;
1134
1135 spin_lock_irqsave(&tspi->lock, flags);
1136 if (tspi->tx_status || tspi->rx_status) {
1137 dev_err(tspi->dev, "CpuXfer ERROR bit set 0x%x\n",
1138 tspi->status_reg);
1139 dev_err(tspi->dev, "CpuXfer 0x%08x:0x%08x\n",
1140 tspi->command1_reg, tspi->dma_control_reg);
1141 tegra_spi_dump_regs(tspi);
1142 tegra_spi_flush_fifos(tspi);
1143 complete(&tspi->xfer_completion);
1144 spin_unlock_irqrestore(&tspi->lock, flags);
1145 reset_control_assert(tspi->rst);
1146 udelay(2);
1147 reset_control_deassert(tspi->rst);
1148 return IRQ_HANDLED;
1149 }
1150
1151 if (tspi->cur_direction & DATA_DIR_RX)
1152 tegra_spi_read_rx_fifo_to_client_rxbuf(tspi, t);
1153
1154 if (tspi->cur_direction & DATA_DIR_TX)
1155 tspi->cur_pos = tspi->cur_tx_pos;
1156 else
1157 tspi->cur_pos = tspi->cur_rx_pos;
1158
1159 if (tspi->cur_pos == t->len) {
1160 complete(&tspi->xfer_completion);
1161 goto exit;
1162 }
1163
1164 tegra_spi_calculate_curr_xfer_param(tspi->cur_spi, tspi, t);
1165 tegra_spi_start_cpu_based_transfer(tspi, t);
1166exit:
1167 spin_unlock_irqrestore(&tspi->lock, flags);
1168 return IRQ_HANDLED;
1169}
1170
1171static irqreturn_t handle_dma_based_xfer(struct tegra_spi_data *tspi)
1172{
1173 struct spi_transfer *t = tspi->curr_xfer;
1174 long wait_status;
1175 int err = 0;
1176 unsigned total_fifo_words;
1177 unsigned long flags;
1178
1179 /* Abort dmas if any error */
1180 if (tspi->cur_direction & DATA_DIR_TX) {
1181 if (tspi->tx_status) {
1182 dmaengine_terminate_all(tspi->tx_dma_chan);
1183 err += 1;
1184 } else {
1185 wait_status = wait_for_completion_interruptible_timeout(
1186 &tspi->tx_dma_complete, SPI_DMA_TIMEOUT);
1187 if (wait_status <= 0) {
1188 dmaengine_terminate_all(tspi->tx_dma_chan);
1189 dev_err(tspi->dev, "TxDma Xfer failed\n");
1190 err += 1;
1191 }
1192 }
1193 }
1194
1195 if (tspi->cur_direction & DATA_DIR_RX) {
1196 if (tspi->rx_status) {
1197 dmaengine_terminate_all(tspi->rx_dma_chan);
1198 err += 2;
1199 } else {
1200 wait_status = wait_for_completion_interruptible_timeout(
1201 &tspi->rx_dma_complete, SPI_DMA_TIMEOUT);
1202 if (wait_status <= 0) {
1203 dmaengine_terminate_all(tspi->rx_dma_chan);
1204 dev_err(tspi->dev, "RxDma Xfer failed\n");
1205 err += 2;
1206 }
1207 }
1208 }
1209
1210 spin_lock_irqsave(&tspi->lock, flags);
1211 if (err) {
1212 dev_err(tspi->dev, "DmaXfer: ERROR bit set 0x%x\n",
1213 tspi->status_reg);
1214 dev_err(tspi->dev, "DmaXfer 0x%08x:0x%08x\n",
1215 tspi->command1_reg, tspi->dma_control_reg);
1216 tegra_spi_dump_regs(tspi);
1217 tegra_spi_flush_fifos(tspi);
1218 complete(&tspi->xfer_completion);
1219 spin_unlock_irqrestore(&tspi->lock, flags);
1220 reset_control_assert(tspi->rst);
1221 udelay(2);
1222 reset_control_deassert(tspi->rst);
1223 return IRQ_HANDLED;
1224 }
1225
1226 if (tspi->cur_direction & DATA_DIR_RX)
1227 tegra_spi_copy_spi_rxbuf_to_client_rxbuf(tspi, t);
1228
1229 if (tspi->cur_direction & DATA_DIR_TX)
1230 tspi->cur_pos = tspi->cur_tx_pos;
1231 else
1232 tspi->cur_pos = tspi->cur_rx_pos;
1233
1234 if (tspi->cur_pos == t->len) {
1235 complete(&tspi->xfer_completion);
1236 goto exit;
1237 }
1238
1239 /* Continue transfer in current message */
1240 total_fifo_words = tegra_spi_calculate_curr_xfer_param(tspi->cur_spi,
1241 tspi, t);
1242 if (total_fifo_words > SPI_FIFO_DEPTH)
1243 err = tegra_spi_start_dma_based_transfer(tspi, t);
1244 else
1245 err = tegra_spi_start_cpu_based_transfer(tspi, t);
1246
1247exit:
1248 spin_unlock_irqrestore(&tspi->lock, flags);
1249 return IRQ_HANDLED;
1250}
1251
1252static irqreturn_t tegra_spi_isr_thread(int irq, void *context_data)
1253{
1254 struct tegra_spi_data *tspi = context_data;
1255
1256 if (!tspi->is_curr_dma_xfer)
1257 return handle_cpu_based_xfer(tspi);
1258 return handle_dma_based_xfer(tspi);
1259}
1260
1261static irqreturn_t tegra_spi_isr(int irq, void *context_data)
1262{
1263 struct tegra_spi_data *tspi = context_data;
1264
1265 tspi->status_reg = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
1266 if (tspi->cur_direction & DATA_DIR_TX)
1267 tspi->tx_status = tspi->status_reg &
1268 (SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF);
1269
1270 if (tspi->cur_direction & DATA_DIR_RX)
1271 tspi->rx_status = tspi->status_reg &
1272 (SPI_RX_FIFO_OVF | SPI_RX_FIFO_UNF);
1273 tegra_spi_clear_status(tspi);
1274
1275 return IRQ_WAKE_THREAD;
1276}
1277
1278static struct tegra_spi_soc_data tegra114_spi_soc_data = {
1279 .has_intr_mask_reg = false,
1280};
1281
1282static struct tegra_spi_soc_data tegra124_spi_soc_data = {
1283 .has_intr_mask_reg = false,
1284};
1285
1286static struct tegra_spi_soc_data tegra210_spi_soc_data = {
1287 .has_intr_mask_reg = true,
1288};
1289
1290static const struct of_device_id tegra_spi_of_match[] = {
1291 {
1292 .compatible = "nvidia,tegra114-spi",
1293 .data = &tegra114_spi_soc_data,
1294 }, {
1295 .compatible = "nvidia,tegra124-spi",
1296 .data = &tegra124_spi_soc_data,
1297 }, {
1298 .compatible = "nvidia,tegra210-spi",
1299 .data = &tegra210_spi_soc_data,
1300 },
1301 {}
1302};
1303MODULE_DEVICE_TABLE(of, tegra_spi_of_match);
1304
1305static int tegra_spi_probe(struct platform_device *pdev)
1306{
1307 struct spi_master *master;
1308 struct tegra_spi_data *tspi;
1309 struct resource *r;
1310 int ret, spi_irq;
1311 int bus_num;
1312
1313 master = spi_alloc_master(&pdev->dev, sizeof(*tspi));
1314 if (!master) {
1315 dev_err(&pdev->dev, "master allocation failed\n");
1316 return -ENOMEM;
1317 }
1318 platform_set_drvdata(pdev, master);
1319 tspi = spi_master_get_devdata(master);
1320
1321 if (of_property_read_u32(pdev->dev.of_node, "spi-max-frequency",
1322 &master->max_speed_hz))
1323 master->max_speed_hz = 25000000; /* 25MHz */
1324
1325 /* the spi->mode bits understood by this driver: */
1326 master->use_gpio_descriptors = true;
1327 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST |
1328 SPI_TX_DUAL | SPI_RX_DUAL | SPI_3WIRE;
1329 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
1330 master->setup = tegra_spi_setup;
1331 master->cleanup = tegra_spi_cleanup;
1332 master->transfer_one_message = tegra_spi_transfer_one_message;
1333 master->set_cs_timing = tegra_spi_set_hw_cs_timing;
1334 master->num_chipselect = MAX_CHIP_SELECT;
1335 master->auto_runtime_pm = true;
1336 bus_num = of_alias_get_id(pdev->dev.of_node, "spi");
1337 if (bus_num >= 0)
1338 master->bus_num = bus_num;
1339
1340 tspi->master = master;
1341 tspi->dev = &pdev->dev;
1342 spin_lock_init(&tspi->lock);
1343
1344 tspi->soc_data = of_device_get_match_data(&pdev->dev);
1345 if (!tspi->soc_data) {
1346 dev_err(&pdev->dev, "unsupported tegra\n");
1347 ret = -ENODEV;
1348 goto exit_free_master;
1349 }
1350
1351 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1352 tspi->base = devm_ioremap_resource(&pdev->dev, r);
1353 if (IS_ERR(tspi->base)) {
1354 ret = PTR_ERR(tspi->base);
1355 goto exit_free_master;
1356 }
1357 tspi->phys = r->start;
1358
1359 spi_irq = platform_get_irq(pdev, 0);
1360 tspi->irq = spi_irq;
1361
1362 tspi->clk = devm_clk_get(&pdev->dev, "spi");
1363 if (IS_ERR(tspi->clk)) {
1364 dev_err(&pdev->dev, "can not get clock\n");
1365 ret = PTR_ERR(tspi->clk);
1366 goto exit_free_master;
1367 }
1368
1369 tspi->rst = devm_reset_control_get_exclusive(&pdev->dev, "spi");
1370 if (IS_ERR(tspi->rst)) {
1371 dev_err(&pdev->dev, "can not get reset\n");
1372 ret = PTR_ERR(tspi->rst);
1373 goto exit_free_master;
1374 }
1375
1376 tspi->max_buf_size = SPI_FIFO_DEPTH << 2;
1377 tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN;
1378
1379 ret = tegra_spi_init_dma_param(tspi, true);
1380 if (ret < 0)
1381 goto exit_free_master;
1382 ret = tegra_spi_init_dma_param(tspi, false);
1383 if (ret < 0)
1384 goto exit_rx_dma_free;
1385 tspi->max_buf_size = tspi->dma_buf_size;
1386 init_completion(&tspi->tx_dma_complete);
1387 init_completion(&tspi->rx_dma_complete);
1388
1389 init_completion(&tspi->xfer_completion);
1390
1391 pm_runtime_enable(&pdev->dev);
1392 if (!pm_runtime_enabled(&pdev->dev)) {
1393 ret = tegra_spi_runtime_resume(&pdev->dev);
1394 if (ret)
1395 goto exit_pm_disable;
1396 }
1397
1398 ret = pm_runtime_get_sync(&pdev->dev);
1399 if (ret < 0) {
1400 dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret);
1401 pm_runtime_put_noidle(&pdev->dev);
1402 goto exit_pm_disable;
1403 }
1404
1405 reset_control_assert(tspi->rst);
1406 udelay(2);
1407 reset_control_deassert(tspi->rst);
1408 tspi->def_command1_reg = SPI_M_S;
1409 tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1);
1410 tspi->spi_cs_timing1 = tegra_spi_readl(tspi, SPI_CS_TIMING1);
1411 tspi->spi_cs_timing2 = tegra_spi_readl(tspi, SPI_CS_TIMING2);
1412 tspi->def_command2_reg = tegra_spi_readl(tspi, SPI_COMMAND2);
1413 tspi->last_used_cs = master->num_chipselect + 1;
1414 pm_runtime_put(&pdev->dev);
1415 ret = request_threaded_irq(tspi->irq, tegra_spi_isr,
1416 tegra_spi_isr_thread, IRQF_ONESHOT,
1417 dev_name(&pdev->dev), tspi);
1418 if (ret < 0) {
1419 dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n",
1420 tspi->irq);
1421 goto exit_pm_disable;
1422 }
1423
1424 master->dev.of_node = pdev->dev.of_node;
1425 ret = devm_spi_register_master(&pdev->dev, master);
1426 if (ret < 0) {
1427 dev_err(&pdev->dev, "can not register to master err %d\n", ret);
1428 goto exit_free_irq;
1429 }
1430 return ret;
1431
1432exit_free_irq:
1433 free_irq(spi_irq, tspi);
1434exit_pm_disable:
1435 pm_runtime_disable(&pdev->dev);
1436 if (!pm_runtime_status_suspended(&pdev->dev))
1437 tegra_spi_runtime_suspend(&pdev->dev);
1438 tegra_spi_deinit_dma_param(tspi, false);
1439exit_rx_dma_free:
1440 tegra_spi_deinit_dma_param(tspi, true);
1441exit_free_master:
1442 spi_master_put(master);
1443 return ret;
1444}
1445
1446static int tegra_spi_remove(struct platform_device *pdev)
1447{
1448 struct spi_master *master = platform_get_drvdata(pdev);
1449 struct tegra_spi_data *tspi = spi_master_get_devdata(master);
1450
1451 free_irq(tspi->irq, tspi);
1452
1453 if (tspi->tx_dma_chan)
1454 tegra_spi_deinit_dma_param(tspi, false);
1455
1456 if (tspi->rx_dma_chan)
1457 tegra_spi_deinit_dma_param(tspi, true);
1458
1459 pm_runtime_disable(&pdev->dev);
1460 if (!pm_runtime_status_suspended(&pdev->dev))
1461 tegra_spi_runtime_suspend(&pdev->dev);
1462
1463 return 0;
1464}
1465
1466#ifdef CONFIG_PM_SLEEP
1467static int tegra_spi_suspend(struct device *dev)
1468{
1469 struct spi_master *master = dev_get_drvdata(dev);
1470
1471 return spi_master_suspend(master);
1472}
1473
1474static int tegra_spi_resume(struct device *dev)
1475{
1476 struct spi_master *master = dev_get_drvdata(dev);
1477 struct tegra_spi_data *tspi = spi_master_get_devdata(master);
1478 int ret;
1479
1480 ret = pm_runtime_get_sync(dev);
1481 if (ret < 0) {
1482 dev_err(dev, "pm runtime failed, e = %d\n", ret);
1483 return ret;
1484 }
1485 tegra_spi_writel(tspi, tspi->command1_reg, SPI_COMMAND1);
1486 tegra_spi_writel(tspi, tspi->def_command2_reg, SPI_COMMAND2);
1487 tspi->last_used_cs = master->num_chipselect + 1;
1488 pm_runtime_put(dev);
1489
1490 return spi_master_resume(master);
1491}
1492#endif
1493
1494static int tegra_spi_runtime_suspend(struct device *dev)
1495{
1496 struct spi_master *master = dev_get_drvdata(dev);
1497 struct tegra_spi_data *tspi = spi_master_get_devdata(master);
1498
1499 /* Flush all write which are in PPSB queue by reading back */
1500 tegra_spi_readl(tspi, SPI_COMMAND1);
1501
1502 clk_disable_unprepare(tspi->clk);
1503 return 0;
1504}
1505
1506static int tegra_spi_runtime_resume(struct device *dev)
1507{
1508 struct spi_master *master = dev_get_drvdata(dev);
1509 struct tegra_spi_data *tspi = spi_master_get_devdata(master);
1510 int ret;
1511
1512 ret = clk_prepare_enable(tspi->clk);
1513 if (ret < 0) {
1514 dev_err(tspi->dev, "clk_prepare failed: %d\n", ret);
1515 return ret;
1516 }
1517 return 0;
1518}
1519
1520static const struct dev_pm_ops tegra_spi_pm_ops = {
1521 SET_RUNTIME_PM_OPS(tegra_spi_runtime_suspend,
1522 tegra_spi_runtime_resume, NULL)
1523 SET_SYSTEM_SLEEP_PM_OPS(tegra_spi_suspend, tegra_spi_resume)
1524};
1525static struct platform_driver tegra_spi_driver = {
1526 .driver = {
1527 .name = "spi-tegra114",
1528 .pm = &tegra_spi_pm_ops,
1529 .of_match_table = tegra_spi_of_match,
1530 },
1531 .probe = tegra_spi_probe,
1532 .remove = tegra_spi_remove,
1533};
1534module_platform_driver(tegra_spi_driver);
1535
1536MODULE_ALIAS("platform:spi-tegra114");
1537MODULE_DESCRIPTION("NVIDIA Tegra114 SPI Controller Driver");
1538MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
1539MODULE_LICENSE("GPL v2");