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1/*
2 * TI QSPI driver
3 *
4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
5 * Author: Sourav Poddar <sourav.poddar@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GPLv2.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/interrupt.h>
19#include <linux/module.h>
20#include <linux/device.h>
21#include <linux/delay.h>
22#include <linux/dma-mapping.h>
23#include <linux/dmaengine.h>
24#include <linux/omap-dma.h>
25#include <linux/platform_device.h>
26#include <linux/err.h>
27#include <linux/clk.h>
28#include <linux/io.h>
29#include <linux/slab.h>
30#include <linux/pm_runtime.h>
31#include <linux/of.h>
32#include <linux/of_device.h>
33#include <linux/pinctrl/consumer.h>
34
35#include <linux/spi/spi.h>
36
37struct ti_qspi_regs {
38 u32 clkctrl;
39};
40
41struct ti_qspi {
42 struct completion transfer_complete;
43
44 /* list synchronization */
45 struct mutex list_lock;
46
47 struct spi_master *master;
48 void __iomem *base;
49 void __iomem *ctrl_base;
50 void __iomem *mmap_base;
51 struct clk *fclk;
52 struct device *dev;
53
54 struct ti_qspi_regs ctx_reg;
55
56 u32 spi_max_frequency;
57 u32 cmd;
58 u32 dc;
59
60 bool ctrl_mod;
61};
62
63#define QSPI_PID (0x0)
64#define QSPI_SYSCONFIG (0x10)
65#define QSPI_INTR_STATUS_RAW_SET (0x20)
66#define QSPI_INTR_STATUS_ENABLED_CLEAR (0x24)
67#define QSPI_INTR_ENABLE_SET_REG (0x28)
68#define QSPI_INTR_ENABLE_CLEAR_REG (0x2c)
69#define QSPI_SPI_CLOCK_CNTRL_REG (0x40)
70#define QSPI_SPI_DC_REG (0x44)
71#define QSPI_SPI_CMD_REG (0x48)
72#define QSPI_SPI_STATUS_REG (0x4c)
73#define QSPI_SPI_DATA_REG (0x50)
74#define QSPI_SPI_SETUP0_REG (0x54)
75#define QSPI_SPI_SWITCH_REG (0x64)
76#define QSPI_SPI_SETUP1_REG (0x58)
77#define QSPI_SPI_SETUP2_REG (0x5c)
78#define QSPI_SPI_SETUP3_REG (0x60)
79#define QSPI_SPI_DATA_REG_1 (0x68)
80#define QSPI_SPI_DATA_REG_2 (0x6c)
81#define QSPI_SPI_DATA_REG_3 (0x70)
82
83#define QSPI_COMPLETION_TIMEOUT msecs_to_jiffies(2000)
84
85#define QSPI_FCLK 192000000
86
87/* Clock Control */
88#define QSPI_CLK_EN (1 << 31)
89#define QSPI_CLK_DIV_MAX 0xffff
90
91/* Command */
92#define QSPI_EN_CS(n) (n << 28)
93#define QSPI_WLEN(n) ((n - 1) << 19)
94#define QSPI_3_PIN (1 << 18)
95#define QSPI_RD_SNGL (1 << 16)
96#define QSPI_WR_SNGL (2 << 16)
97#define QSPI_RD_DUAL (3 << 16)
98#define QSPI_RD_QUAD (7 << 16)
99#define QSPI_INVAL (4 << 16)
100#define QSPI_WC_CMD_INT_EN (1 << 14)
101#define QSPI_FLEN(n) ((n - 1) << 0)
102
103/* STATUS REGISTER */
104#define WC 0x02
105
106/* INTERRUPT REGISTER */
107#define QSPI_WC_INT_EN (1 << 1)
108#define QSPI_WC_INT_DISABLE (1 << 1)
109
110/* Device Control */
111#define QSPI_DD(m, n) (m << (3 + n * 8))
112#define QSPI_CKPHA(n) (1 << (2 + n * 8))
113#define QSPI_CSPOL(n) (1 << (1 + n * 8))
114#define QSPI_CKPOL(n) (1 << (n * 8))
115
116#define QSPI_FRAME 4096
117
118#define QSPI_AUTOSUSPEND_TIMEOUT 2000
119
120static inline unsigned long ti_qspi_read(struct ti_qspi *qspi,
121 unsigned long reg)
122{
123 return readl(qspi->base + reg);
124}
125
126static inline void ti_qspi_write(struct ti_qspi *qspi,
127 unsigned long val, unsigned long reg)
128{
129 writel(val, qspi->base + reg);
130}
131
132static int ti_qspi_setup(struct spi_device *spi)
133{
134 struct ti_qspi *qspi = spi_master_get_devdata(spi->master);
135 struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg;
136 int clk_div = 0, ret;
137 u32 clk_ctrl_reg, clk_rate, clk_mask;
138
139 if (spi->master->busy) {
140 dev_dbg(qspi->dev, "master busy doing other trasnfers\n");
141 return -EBUSY;
142 }
143
144 if (!qspi->spi_max_frequency) {
145 dev_err(qspi->dev, "spi max frequency not defined\n");
146 return -EINVAL;
147 }
148
149 clk_rate = clk_get_rate(qspi->fclk);
150
151 clk_div = DIV_ROUND_UP(clk_rate, qspi->spi_max_frequency) - 1;
152
153 if (clk_div < 0) {
154 dev_dbg(qspi->dev, "clock divider < 0, using /1 divider\n");
155 return -EINVAL;
156 }
157
158 if (clk_div > QSPI_CLK_DIV_MAX) {
159 dev_dbg(qspi->dev, "clock divider >%d , using /%d divider\n",
160 QSPI_CLK_DIV_MAX, QSPI_CLK_DIV_MAX + 1);
161 return -EINVAL;
162 }
163
164 dev_dbg(qspi->dev, "hz: %d, clock divider %d\n",
165 qspi->spi_max_frequency, clk_div);
166
167 ret = pm_runtime_get_sync(qspi->dev);
168 if (ret < 0) {
169 dev_err(qspi->dev, "pm_runtime_get_sync() failed\n");
170 return ret;
171 }
172
173 clk_ctrl_reg = ti_qspi_read(qspi, QSPI_SPI_CLOCK_CNTRL_REG);
174
175 clk_ctrl_reg &= ~QSPI_CLK_EN;
176
177 /* disable SCLK */
178 ti_qspi_write(qspi, clk_ctrl_reg, QSPI_SPI_CLOCK_CNTRL_REG);
179
180 /* enable SCLK */
181 clk_mask = QSPI_CLK_EN | clk_div;
182 ti_qspi_write(qspi, clk_mask, QSPI_SPI_CLOCK_CNTRL_REG);
183 ctx_reg->clkctrl = clk_mask;
184
185 pm_runtime_mark_last_busy(qspi->dev);
186 ret = pm_runtime_put_autosuspend(qspi->dev);
187 if (ret < 0) {
188 dev_err(qspi->dev, "pm_runtime_put_autosuspend() failed\n");
189 return ret;
190 }
191
192 return 0;
193}
194
195static void ti_qspi_restore_ctx(struct ti_qspi *qspi)
196{
197 struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg;
198
199 ti_qspi_write(qspi, ctx_reg->clkctrl, QSPI_SPI_CLOCK_CNTRL_REG);
200}
201
202static int qspi_write_msg(struct ti_qspi *qspi, struct spi_transfer *t)
203{
204 int wlen, count, ret;
205 unsigned int cmd;
206 const u8 *txbuf;
207
208 txbuf = t->tx_buf;
209 cmd = qspi->cmd | QSPI_WR_SNGL;
210 count = t->len;
211 wlen = t->bits_per_word >> 3; /* in bytes */
212
213 while (count) {
214 switch (wlen) {
215 case 1:
216 dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %02x\n",
217 cmd, qspi->dc, *txbuf);
218 writeb(*txbuf, qspi->base + QSPI_SPI_DATA_REG);
219 break;
220 case 2:
221 dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %04x\n",
222 cmd, qspi->dc, *txbuf);
223 writew(*((u16 *)txbuf), qspi->base + QSPI_SPI_DATA_REG);
224 break;
225 case 4:
226 dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %08x\n",
227 cmd, qspi->dc, *txbuf);
228 writel(*((u32 *)txbuf), qspi->base + QSPI_SPI_DATA_REG);
229 break;
230 }
231
232 ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG);
233 ret = wait_for_completion_timeout(&qspi->transfer_complete,
234 QSPI_COMPLETION_TIMEOUT);
235 if (ret == 0) {
236 dev_err(qspi->dev, "write timed out\n");
237 return -ETIMEDOUT;
238 }
239 txbuf += wlen;
240 count -= wlen;
241 }
242
243 return 0;
244}
245
246static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t)
247{
248 int wlen, count, ret;
249 unsigned int cmd;
250 u8 *rxbuf;
251
252 rxbuf = t->rx_buf;
253 cmd = qspi->cmd;
254 switch (t->rx_nbits) {
255 case SPI_NBITS_DUAL:
256 cmd |= QSPI_RD_DUAL;
257 break;
258 case SPI_NBITS_QUAD:
259 cmd |= QSPI_RD_QUAD;
260 break;
261 default:
262 cmd |= QSPI_RD_SNGL;
263 break;
264 }
265 count = t->len;
266 wlen = t->bits_per_word >> 3; /* in bytes */
267
268 while (count) {
269 dev_dbg(qspi->dev, "rx cmd %08x dc %08x\n", cmd, qspi->dc);
270 ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG);
271 ret = wait_for_completion_timeout(&qspi->transfer_complete,
272 QSPI_COMPLETION_TIMEOUT);
273 if (ret == 0) {
274 dev_err(qspi->dev, "read timed out\n");
275 return -ETIMEDOUT;
276 }
277 switch (wlen) {
278 case 1:
279 *rxbuf = readb(qspi->base + QSPI_SPI_DATA_REG);
280 break;
281 case 2:
282 *((u16 *)rxbuf) = readw(qspi->base + QSPI_SPI_DATA_REG);
283 break;
284 case 4:
285 *((u32 *)rxbuf) = readl(qspi->base + QSPI_SPI_DATA_REG);
286 break;
287 }
288 rxbuf += wlen;
289 count -= wlen;
290 }
291
292 return 0;
293}
294
295static int qspi_transfer_msg(struct ti_qspi *qspi, struct spi_transfer *t)
296{
297 int ret;
298
299 if (t->tx_buf) {
300 ret = qspi_write_msg(qspi, t);
301 if (ret) {
302 dev_dbg(qspi->dev, "Error while writing\n");
303 return ret;
304 }
305 }
306
307 if (t->rx_buf) {
308 ret = qspi_read_msg(qspi, t);
309 if (ret) {
310 dev_dbg(qspi->dev, "Error while reading\n");
311 return ret;
312 }
313 }
314
315 return 0;
316}
317
318static int ti_qspi_start_transfer_one(struct spi_master *master,
319 struct spi_message *m)
320{
321 struct ti_qspi *qspi = spi_master_get_devdata(master);
322 struct spi_device *spi = m->spi;
323 struct spi_transfer *t;
324 int status = 0, ret;
325 int frame_length;
326
327 /* setup device control reg */
328 qspi->dc = 0;
329
330 if (spi->mode & SPI_CPHA)
331 qspi->dc |= QSPI_CKPHA(spi->chip_select);
332 if (spi->mode & SPI_CPOL)
333 qspi->dc |= QSPI_CKPOL(spi->chip_select);
334 if (spi->mode & SPI_CS_HIGH)
335 qspi->dc |= QSPI_CSPOL(spi->chip_select);
336
337 frame_length = (m->frame_length << 3) / spi->bits_per_word;
338
339 frame_length = clamp(frame_length, 0, QSPI_FRAME);
340
341 /* setup command reg */
342 qspi->cmd = 0;
343 qspi->cmd |= QSPI_EN_CS(spi->chip_select);
344 qspi->cmd |= QSPI_FLEN(frame_length);
345 qspi->cmd |= QSPI_WC_CMD_INT_EN;
346
347 ti_qspi_write(qspi, QSPI_WC_INT_EN, QSPI_INTR_ENABLE_SET_REG);
348 ti_qspi_write(qspi, qspi->dc, QSPI_SPI_DC_REG);
349
350 mutex_lock(&qspi->list_lock);
351
352 list_for_each_entry(t, &m->transfers, transfer_list) {
353 qspi->cmd |= QSPI_WLEN(t->bits_per_word);
354
355 ret = qspi_transfer_msg(qspi, t);
356 if (ret) {
357 dev_dbg(qspi->dev, "transfer message failed\n");
358 mutex_unlock(&qspi->list_lock);
359 return -EINVAL;
360 }
361
362 m->actual_length += t->len;
363 }
364
365 mutex_unlock(&qspi->list_lock);
366
367 m->status = status;
368 spi_finalize_current_message(master);
369
370 ti_qspi_write(qspi, qspi->cmd | QSPI_INVAL, QSPI_SPI_CMD_REG);
371
372 return status;
373}
374
375static irqreturn_t ti_qspi_isr(int irq, void *dev_id)
376{
377 struct ti_qspi *qspi = dev_id;
378 u16 int_stat;
379 u32 stat;
380
381 irqreturn_t ret = IRQ_HANDLED;
382
383 int_stat = ti_qspi_read(qspi, QSPI_INTR_STATUS_ENABLED_CLEAR);
384 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG);
385
386 if (!int_stat) {
387 dev_dbg(qspi->dev, "No IRQ triggered\n");
388 ret = IRQ_NONE;
389 goto out;
390 }
391
392 ti_qspi_write(qspi, QSPI_WC_INT_DISABLE,
393 QSPI_INTR_STATUS_ENABLED_CLEAR);
394 if (stat & WC)
395 complete(&qspi->transfer_complete);
396out:
397 return ret;
398}
399
400static int ti_qspi_runtime_resume(struct device *dev)
401{
402 struct ti_qspi *qspi;
403
404 qspi = dev_get_drvdata(dev);
405 ti_qspi_restore_ctx(qspi);
406
407 return 0;
408}
409
410static const struct of_device_id ti_qspi_match[] = {
411 {.compatible = "ti,dra7xxx-qspi" },
412 {.compatible = "ti,am4372-qspi" },
413 {},
414};
415MODULE_DEVICE_TABLE(of, ti_qspi_match);
416
417static int ti_qspi_probe(struct platform_device *pdev)
418{
419 struct ti_qspi *qspi;
420 struct spi_master *master;
421 struct resource *r, *res_ctrl, *res_mmap;
422 struct device_node *np = pdev->dev.of_node;
423 u32 max_freq;
424 int ret = 0, num_cs, irq;
425
426 master = spi_alloc_master(&pdev->dev, sizeof(*qspi));
427 if (!master)
428 return -ENOMEM;
429
430 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD;
431
432 master->flags = SPI_MASTER_HALF_DUPLEX;
433 master->setup = ti_qspi_setup;
434 master->auto_runtime_pm = true;
435 master->transfer_one_message = ti_qspi_start_transfer_one;
436 master->dev.of_node = pdev->dev.of_node;
437 master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) |
438 SPI_BPW_MASK(8);
439
440 if (!of_property_read_u32(np, "num-cs", &num_cs))
441 master->num_chipselect = num_cs;
442
443 qspi = spi_master_get_devdata(master);
444 qspi->master = master;
445 qspi->dev = &pdev->dev;
446 platform_set_drvdata(pdev, qspi);
447
448 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_base");
449 if (r == NULL) {
450 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
451 if (r == NULL) {
452 dev_err(&pdev->dev, "missing platform data\n");
453 return -ENODEV;
454 }
455 }
456
457 res_mmap = platform_get_resource_byname(pdev,
458 IORESOURCE_MEM, "qspi_mmap");
459 if (res_mmap == NULL) {
460 res_mmap = platform_get_resource(pdev, IORESOURCE_MEM, 1);
461 if (res_mmap == NULL) {
462 dev_err(&pdev->dev,
463 "memory mapped resource not required\n");
464 }
465 }
466
467 res_ctrl = platform_get_resource_byname(pdev,
468 IORESOURCE_MEM, "qspi_ctrlmod");
469 if (res_ctrl == NULL) {
470 res_ctrl = platform_get_resource(pdev, IORESOURCE_MEM, 2);
471 if (res_ctrl == NULL) {
472 dev_dbg(&pdev->dev,
473 "control module resources not required\n");
474 }
475 }
476
477 irq = platform_get_irq(pdev, 0);
478 if (irq < 0) {
479 dev_err(&pdev->dev, "no irq resource?\n");
480 return irq;
481 }
482
483 mutex_init(&qspi->list_lock);
484
485 qspi->base = devm_ioremap_resource(&pdev->dev, r);
486 if (IS_ERR(qspi->base)) {
487 ret = PTR_ERR(qspi->base);
488 goto free_master;
489 }
490
491 if (res_ctrl) {
492 qspi->ctrl_mod = true;
493 qspi->ctrl_base = devm_ioremap_resource(&pdev->dev, res_ctrl);
494 if (IS_ERR(qspi->ctrl_base)) {
495 ret = PTR_ERR(qspi->ctrl_base);
496 goto free_master;
497 }
498 }
499
500 if (res_mmap) {
501 qspi->mmap_base = devm_ioremap_resource(&pdev->dev, res_mmap);
502 if (IS_ERR(qspi->mmap_base)) {
503 ret = PTR_ERR(qspi->mmap_base);
504 goto free_master;
505 }
506 }
507
508 ret = devm_request_irq(&pdev->dev, irq, ti_qspi_isr, 0,
509 dev_name(&pdev->dev), qspi);
510 if (ret < 0) {
511 dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n",
512 irq);
513 goto free_master;
514 }
515
516 qspi->fclk = devm_clk_get(&pdev->dev, "fck");
517 if (IS_ERR(qspi->fclk)) {
518 ret = PTR_ERR(qspi->fclk);
519 dev_err(&pdev->dev, "could not get clk: %d\n", ret);
520 }
521
522 init_completion(&qspi->transfer_complete);
523
524 pm_runtime_use_autosuspend(&pdev->dev);
525 pm_runtime_set_autosuspend_delay(&pdev->dev, QSPI_AUTOSUSPEND_TIMEOUT);
526 pm_runtime_enable(&pdev->dev);
527
528 if (!of_property_read_u32(np, "spi-max-frequency", &max_freq))
529 qspi->spi_max_frequency = max_freq;
530
531 ret = devm_spi_register_master(&pdev->dev, master);
532 if (ret)
533 goto free_master;
534
535 return 0;
536
537free_master:
538 spi_master_put(master);
539 return ret;
540}
541
542static int ti_qspi_remove(struct platform_device *pdev)
543{
544 struct ti_qspi *qspi = platform_get_drvdata(pdev);
545 int ret;
546
547 ret = pm_runtime_get_sync(qspi->dev);
548 if (ret < 0) {
549 dev_err(qspi->dev, "pm_runtime_get_sync() failed\n");
550 return ret;
551 }
552
553 ti_qspi_write(qspi, QSPI_WC_INT_DISABLE, QSPI_INTR_ENABLE_CLEAR_REG);
554
555 pm_runtime_put(qspi->dev);
556 pm_runtime_disable(&pdev->dev);
557
558 return 0;
559}
560
561static const struct dev_pm_ops ti_qspi_pm_ops = {
562 .runtime_resume = ti_qspi_runtime_resume,
563};
564
565static struct platform_driver ti_qspi_driver = {
566 .probe = ti_qspi_probe,
567 .remove = ti_qspi_remove,
568 .driver = {
569 .name = "ti-qspi",
570 .owner = THIS_MODULE,
571 .pm = &ti_qspi_pm_ops,
572 .of_match_table = ti_qspi_match,
573 }
574};
575
576module_platform_driver(ti_qspi_driver);
577
578MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>");
579MODULE_LICENSE("GPL v2");
580MODULE_DESCRIPTION("TI QSPI controller driver");
581MODULE_ALIAS("platform:ti-qspi");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * TI QSPI driver
4 *
5 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
6 * Author: Sourav Poddar <sourav.poddar@ti.com>
7 */
8
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/interrupt.h>
12#include <linux/module.h>
13#include <linux/device.h>
14#include <linux/delay.h>
15#include <linux/dma-mapping.h>
16#include <linux/dmaengine.h>
17#include <linux/omap-dma.h>
18#include <linux/platform_device.h>
19#include <linux/err.h>
20#include <linux/clk.h>
21#include <linux/io.h>
22#include <linux/slab.h>
23#include <linux/pm_runtime.h>
24#include <linux/of.h>
25#include <linux/of_device.h>
26#include <linux/pinctrl/consumer.h>
27#include <linux/mfd/syscon.h>
28#include <linux/regmap.h>
29#include <linux/sizes.h>
30
31#include <linux/spi/spi.h>
32#include <linux/spi/spi-mem.h>
33
34struct ti_qspi_regs {
35 u32 clkctrl;
36};
37
38struct ti_qspi {
39 struct completion transfer_complete;
40
41 /* list synchronization */
42 struct mutex list_lock;
43
44 struct spi_master *master;
45 void __iomem *base;
46 void __iomem *mmap_base;
47 size_t mmap_size;
48 struct regmap *ctrl_base;
49 unsigned int ctrl_reg;
50 struct clk *fclk;
51 struct device *dev;
52
53 struct ti_qspi_regs ctx_reg;
54
55 dma_addr_t mmap_phys_base;
56 dma_addr_t rx_bb_dma_addr;
57 void *rx_bb_addr;
58 struct dma_chan *rx_chan;
59
60 u32 spi_max_frequency;
61 u32 cmd;
62 u32 dc;
63
64 bool mmap_enabled;
65};
66
67#define QSPI_PID (0x0)
68#define QSPI_SYSCONFIG (0x10)
69#define QSPI_SPI_CLOCK_CNTRL_REG (0x40)
70#define QSPI_SPI_DC_REG (0x44)
71#define QSPI_SPI_CMD_REG (0x48)
72#define QSPI_SPI_STATUS_REG (0x4c)
73#define QSPI_SPI_DATA_REG (0x50)
74#define QSPI_SPI_SETUP_REG(n) ((0x54 + 4 * n))
75#define QSPI_SPI_SWITCH_REG (0x64)
76#define QSPI_SPI_DATA_REG_1 (0x68)
77#define QSPI_SPI_DATA_REG_2 (0x6c)
78#define QSPI_SPI_DATA_REG_3 (0x70)
79
80#define QSPI_COMPLETION_TIMEOUT msecs_to_jiffies(2000)
81
82#define QSPI_FCLK 192000000
83
84/* Clock Control */
85#define QSPI_CLK_EN (1 << 31)
86#define QSPI_CLK_DIV_MAX 0xffff
87
88/* Command */
89#define QSPI_EN_CS(n) (n << 28)
90#define QSPI_WLEN(n) ((n - 1) << 19)
91#define QSPI_3_PIN (1 << 18)
92#define QSPI_RD_SNGL (1 << 16)
93#define QSPI_WR_SNGL (2 << 16)
94#define QSPI_RD_DUAL (3 << 16)
95#define QSPI_RD_QUAD (7 << 16)
96#define QSPI_INVAL (4 << 16)
97#define QSPI_FLEN(n) ((n - 1) << 0)
98#define QSPI_WLEN_MAX_BITS 128
99#define QSPI_WLEN_MAX_BYTES 16
100#define QSPI_WLEN_MASK QSPI_WLEN(QSPI_WLEN_MAX_BITS)
101
102/* STATUS REGISTER */
103#define BUSY 0x01
104#define WC 0x02
105
106/* Device Control */
107#define QSPI_DD(m, n) (m << (3 + n * 8))
108#define QSPI_CKPHA(n) (1 << (2 + n * 8))
109#define QSPI_CSPOL(n) (1 << (1 + n * 8))
110#define QSPI_CKPOL(n) (1 << (n * 8))
111
112#define QSPI_FRAME 4096
113
114#define QSPI_AUTOSUSPEND_TIMEOUT 2000
115
116#define MEM_CS_EN(n) ((n + 1) << 8)
117#define MEM_CS_MASK (7 << 8)
118
119#define MM_SWITCH 0x1
120
121#define QSPI_SETUP_RD_NORMAL (0x0 << 12)
122#define QSPI_SETUP_RD_DUAL (0x1 << 12)
123#define QSPI_SETUP_RD_QUAD (0x3 << 12)
124#define QSPI_SETUP_ADDR_SHIFT 8
125#define QSPI_SETUP_DUMMY_SHIFT 10
126
127#define QSPI_DMA_BUFFER_SIZE SZ_64K
128
129static inline unsigned long ti_qspi_read(struct ti_qspi *qspi,
130 unsigned long reg)
131{
132 return readl(qspi->base + reg);
133}
134
135static inline void ti_qspi_write(struct ti_qspi *qspi,
136 unsigned long val, unsigned long reg)
137{
138 writel(val, qspi->base + reg);
139}
140
141static int ti_qspi_setup(struct spi_device *spi)
142{
143 struct ti_qspi *qspi = spi_master_get_devdata(spi->master);
144 struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg;
145 int clk_div = 0, ret;
146 u32 clk_ctrl_reg, clk_rate, clk_mask;
147
148 if (spi->master->busy) {
149 dev_dbg(qspi->dev, "master busy doing other transfers\n");
150 return -EBUSY;
151 }
152
153 if (!qspi->spi_max_frequency) {
154 dev_err(qspi->dev, "spi max frequency not defined\n");
155 return -EINVAL;
156 }
157
158 clk_rate = clk_get_rate(qspi->fclk);
159
160 clk_div = DIV_ROUND_UP(clk_rate, qspi->spi_max_frequency) - 1;
161
162 if (clk_div < 0) {
163 dev_dbg(qspi->dev, "clock divider < 0, using /1 divider\n");
164 return -EINVAL;
165 }
166
167 if (clk_div > QSPI_CLK_DIV_MAX) {
168 dev_dbg(qspi->dev, "clock divider >%d , using /%d divider\n",
169 QSPI_CLK_DIV_MAX, QSPI_CLK_DIV_MAX + 1);
170 return -EINVAL;
171 }
172
173 dev_dbg(qspi->dev, "hz: %d, clock divider %d\n",
174 qspi->spi_max_frequency, clk_div);
175
176 ret = pm_runtime_get_sync(qspi->dev);
177 if (ret < 0) {
178 dev_err(qspi->dev, "pm_runtime_get_sync() failed\n");
179 return ret;
180 }
181
182 clk_ctrl_reg = ti_qspi_read(qspi, QSPI_SPI_CLOCK_CNTRL_REG);
183
184 clk_ctrl_reg &= ~QSPI_CLK_EN;
185
186 /* disable SCLK */
187 ti_qspi_write(qspi, clk_ctrl_reg, QSPI_SPI_CLOCK_CNTRL_REG);
188
189 /* enable SCLK */
190 clk_mask = QSPI_CLK_EN | clk_div;
191 ti_qspi_write(qspi, clk_mask, QSPI_SPI_CLOCK_CNTRL_REG);
192 ctx_reg->clkctrl = clk_mask;
193
194 pm_runtime_mark_last_busy(qspi->dev);
195 ret = pm_runtime_put_autosuspend(qspi->dev);
196 if (ret < 0) {
197 dev_err(qspi->dev, "pm_runtime_put_autosuspend() failed\n");
198 return ret;
199 }
200
201 return 0;
202}
203
204static void ti_qspi_restore_ctx(struct ti_qspi *qspi)
205{
206 struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg;
207
208 ti_qspi_write(qspi, ctx_reg->clkctrl, QSPI_SPI_CLOCK_CNTRL_REG);
209}
210
211static inline u32 qspi_is_busy(struct ti_qspi *qspi)
212{
213 u32 stat;
214 unsigned long timeout = jiffies + QSPI_COMPLETION_TIMEOUT;
215
216 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG);
217 while ((stat & BUSY) && time_after(timeout, jiffies)) {
218 cpu_relax();
219 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG);
220 }
221
222 WARN(stat & BUSY, "qspi busy\n");
223 return stat & BUSY;
224}
225
226static inline int ti_qspi_poll_wc(struct ti_qspi *qspi)
227{
228 u32 stat;
229 unsigned long timeout = jiffies + QSPI_COMPLETION_TIMEOUT;
230
231 do {
232 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG);
233 if (stat & WC)
234 return 0;
235 cpu_relax();
236 } while (time_after(timeout, jiffies));
237
238 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG);
239 if (stat & WC)
240 return 0;
241 return -ETIMEDOUT;
242}
243
244static int qspi_write_msg(struct ti_qspi *qspi, struct spi_transfer *t,
245 int count)
246{
247 int wlen, xfer_len;
248 unsigned int cmd;
249 const u8 *txbuf;
250 u32 data;
251
252 txbuf = t->tx_buf;
253 cmd = qspi->cmd | QSPI_WR_SNGL;
254 wlen = t->bits_per_word >> 3; /* in bytes */
255 xfer_len = wlen;
256
257 while (count) {
258 if (qspi_is_busy(qspi))
259 return -EBUSY;
260
261 switch (wlen) {
262 case 1:
263 dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %02x\n",
264 cmd, qspi->dc, *txbuf);
265 if (count >= QSPI_WLEN_MAX_BYTES) {
266 u32 *txp = (u32 *)txbuf;
267
268 data = cpu_to_be32(*txp++);
269 writel(data, qspi->base +
270 QSPI_SPI_DATA_REG_3);
271 data = cpu_to_be32(*txp++);
272 writel(data, qspi->base +
273 QSPI_SPI_DATA_REG_2);
274 data = cpu_to_be32(*txp++);
275 writel(data, qspi->base +
276 QSPI_SPI_DATA_REG_1);
277 data = cpu_to_be32(*txp++);
278 writel(data, qspi->base +
279 QSPI_SPI_DATA_REG);
280 xfer_len = QSPI_WLEN_MAX_BYTES;
281 cmd |= QSPI_WLEN(QSPI_WLEN_MAX_BITS);
282 } else {
283 writeb(*txbuf, qspi->base + QSPI_SPI_DATA_REG);
284 cmd = qspi->cmd | QSPI_WR_SNGL;
285 xfer_len = wlen;
286 cmd |= QSPI_WLEN(wlen);
287 }
288 break;
289 case 2:
290 dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %04x\n",
291 cmd, qspi->dc, *txbuf);
292 writew(*((u16 *)txbuf), qspi->base + QSPI_SPI_DATA_REG);
293 break;
294 case 4:
295 dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %08x\n",
296 cmd, qspi->dc, *txbuf);
297 writel(*((u32 *)txbuf), qspi->base + QSPI_SPI_DATA_REG);
298 break;
299 }
300
301 ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG);
302 if (ti_qspi_poll_wc(qspi)) {
303 dev_err(qspi->dev, "write timed out\n");
304 return -ETIMEDOUT;
305 }
306 txbuf += xfer_len;
307 count -= xfer_len;
308 }
309
310 return 0;
311}
312
313static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t,
314 int count)
315{
316 int wlen;
317 unsigned int cmd;
318 u8 *rxbuf;
319
320 rxbuf = t->rx_buf;
321 cmd = qspi->cmd;
322 switch (t->rx_nbits) {
323 case SPI_NBITS_DUAL:
324 cmd |= QSPI_RD_DUAL;
325 break;
326 case SPI_NBITS_QUAD:
327 cmd |= QSPI_RD_QUAD;
328 break;
329 default:
330 cmd |= QSPI_RD_SNGL;
331 break;
332 }
333 wlen = t->bits_per_word >> 3; /* in bytes */
334
335 while (count) {
336 dev_dbg(qspi->dev, "rx cmd %08x dc %08x\n", cmd, qspi->dc);
337 if (qspi_is_busy(qspi))
338 return -EBUSY;
339
340 ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG);
341 if (ti_qspi_poll_wc(qspi)) {
342 dev_err(qspi->dev, "read timed out\n");
343 return -ETIMEDOUT;
344 }
345 switch (wlen) {
346 case 1:
347 *rxbuf = readb(qspi->base + QSPI_SPI_DATA_REG);
348 break;
349 case 2:
350 *((u16 *)rxbuf) = readw(qspi->base + QSPI_SPI_DATA_REG);
351 break;
352 case 4:
353 *((u32 *)rxbuf) = readl(qspi->base + QSPI_SPI_DATA_REG);
354 break;
355 }
356 rxbuf += wlen;
357 count -= wlen;
358 }
359
360 return 0;
361}
362
363static int qspi_transfer_msg(struct ti_qspi *qspi, struct spi_transfer *t,
364 int count)
365{
366 int ret;
367
368 if (t->tx_buf) {
369 ret = qspi_write_msg(qspi, t, count);
370 if (ret) {
371 dev_dbg(qspi->dev, "Error while writing\n");
372 return ret;
373 }
374 }
375
376 if (t->rx_buf) {
377 ret = qspi_read_msg(qspi, t, count);
378 if (ret) {
379 dev_dbg(qspi->dev, "Error while reading\n");
380 return ret;
381 }
382 }
383
384 return 0;
385}
386
387static void ti_qspi_dma_callback(void *param)
388{
389 struct ti_qspi *qspi = param;
390
391 complete(&qspi->transfer_complete);
392}
393
394static int ti_qspi_dma_xfer(struct ti_qspi *qspi, dma_addr_t dma_dst,
395 dma_addr_t dma_src, size_t len)
396{
397 struct dma_chan *chan = qspi->rx_chan;
398 dma_cookie_t cookie;
399 enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
400 struct dma_async_tx_descriptor *tx;
401 int ret;
402
403 tx = dmaengine_prep_dma_memcpy(chan, dma_dst, dma_src, len, flags);
404 if (!tx) {
405 dev_err(qspi->dev, "device_prep_dma_memcpy error\n");
406 return -EIO;
407 }
408
409 tx->callback = ti_qspi_dma_callback;
410 tx->callback_param = qspi;
411 cookie = tx->tx_submit(tx);
412 reinit_completion(&qspi->transfer_complete);
413
414 ret = dma_submit_error(cookie);
415 if (ret) {
416 dev_err(qspi->dev, "dma_submit_error %d\n", cookie);
417 return -EIO;
418 }
419
420 dma_async_issue_pending(chan);
421 ret = wait_for_completion_timeout(&qspi->transfer_complete,
422 msecs_to_jiffies(len));
423 if (ret <= 0) {
424 dmaengine_terminate_sync(chan);
425 dev_err(qspi->dev, "DMA wait_for_completion_timeout\n");
426 return -ETIMEDOUT;
427 }
428
429 return 0;
430}
431
432static int ti_qspi_dma_bounce_buffer(struct ti_qspi *qspi, loff_t offs,
433 void *to, size_t readsize)
434{
435 dma_addr_t dma_src = qspi->mmap_phys_base + offs;
436 int ret = 0;
437
438 /*
439 * Use bounce buffer as FS like jffs2, ubifs may pass
440 * buffers that does not belong to kernel lowmem region.
441 */
442 while (readsize != 0) {
443 size_t xfer_len = min_t(size_t, QSPI_DMA_BUFFER_SIZE,
444 readsize);
445
446 ret = ti_qspi_dma_xfer(qspi, qspi->rx_bb_dma_addr,
447 dma_src, xfer_len);
448 if (ret != 0)
449 return ret;
450 memcpy(to, qspi->rx_bb_addr, xfer_len);
451 readsize -= xfer_len;
452 dma_src += xfer_len;
453 to += xfer_len;
454 }
455
456 return ret;
457}
458
459static int ti_qspi_dma_xfer_sg(struct ti_qspi *qspi, struct sg_table rx_sg,
460 loff_t from)
461{
462 struct scatterlist *sg;
463 dma_addr_t dma_src = qspi->mmap_phys_base + from;
464 dma_addr_t dma_dst;
465 int i, len, ret;
466
467 for_each_sg(rx_sg.sgl, sg, rx_sg.nents, i) {
468 dma_dst = sg_dma_address(sg);
469 len = sg_dma_len(sg);
470 ret = ti_qspi_dma_xfer(qspi, dma_dst, dma_src, len);
471 if (ret)
472 return ret;
473 dma_src += len;
474 }
475
476 return 0;
477}
478
479static void ti_qspi_enable_memory_map(struct spi_device *spi)
480{
481 struct ti_qspi *qspi = spi_master_get_devdata(spi->master);
482
483 ti_qspi_write(qspi, MM_SWITCH, QSPI_SPI_SWITCH_REG);
484 if (qspi->ctrl_base) {
485 regmap_update_bits(qspi->ctrl_base, qspi->ctrl_reg,
486 MEM_CS_MASK,
487 MEM_CS_EN(spi->chip_select));
488 }
489 qspi->mmap_enabled = true;
490}
491
492static void ti_qspi_disable_memory_map(struct spi_device *spi)
493{
494 struct ti_qspi *qspi = spi_master_get_devdata(spi->master);
495
496 ti_qspi_write(qspi, 0, QSPI_SPI_SWITCH_REG);
497 if (qspi->ctrl_base)
498 regmap_update_bits(qspi->ctrl_base, qspi->ctrl_reg,
499 MEM_CS_MASK, 0);
500 qspi->mmap_enabled = false;
501}
502
503static void ti_qspi_setup_mmap_read(struct spi_device *spi, u8 opcode,
504 u8 data_nbits, u8 addr_width,
505 u8 dummy_bytes)
506{
507 struct ti_qspi *qspi = spi_master_get_devdata(spi->master);
508 u32 memval = opcode;
509
510 switch (data_nbits) {
511 case SPI_NBITS_QUAD:
512 memval |= QSPI_SETUP_RD_QUAD;
513 break;
514 case SPI_NBITS_DUAL:
515 memval |= QSPI_SETUP_RD_DUAL;
516 break;
517 default:
518 memval |= QSPI_SETUP_RD_NORMAL;
519 break;
520 }
521 memval |= ((addr_width - 1) << QSPI_SETUP_ADDR_SHIFT |
522 dummy_bytes << QSPI_SETUP_DUMMY_SHIFT);
523 ti_qspi_write(qspi, memval,
524 QSPI_SPI_SETUP_REG(spi->chip_select));
525}
526
527static int ti_qspi_exec_mem_op(struct spi_mem *mem,
528 const struct spi_mem_op *op)
529{
530 struct ti_qspi *qspi = spi_master_get_devdata(mem->spi->master);
531 u32 from = 0;
532 int ret = 0;
533
534 /* Only optimize read path. */
535 if (!op->data.nbytes || op->data.dir != SPI_MEM_DATA_IN ||
536 !op->addr.nbytes || op->addr.nbytes > 4)
537 return -ENOTSUPP;
538
539 /* Address exceeds MMIO window size, fall back to regular mode. */
540 from = op->addr.val;
541 if (from + op->data.nbytes > qspi->mmap_size)
542 return -ENOTSUPP;
543
544 mutex_lock(&qspi->list_lock);
545
546 if (!qspi->mmap_enabled)
547 ti_qspi_enable_memory_map(mem->spi);
548 ti_qspi_setup_mmap_read(mem->spi, op->cmd.opcode, op->data.buswidth,
549 op->addr.nbytes, op->dummy.nbytes);
550
551 if (qspi->rx_chan) {
552 struct sg_table sgt;
553
554 if (virt_addr_valid(op->data.buf.in) &&
555 !spi_controller_dma_map_mem_op_data(mem->spi->master, op,
556 &sgt)) {
557 ret = ti_qspi_dma_xfer_sg(qspi, sgt, from);
558 spi_controller_dma_unmap_mem_op_data(mem->spi->master,
559 op, &sgt);
560 } else {
561 ret = ti_qspi_dma_bounce_buffer(qspi, from,
562 op->data.buf.in,
563 op->data.nbytes);
564 }
565 } else {
566 memcpy_fromio(op->data.buf.in, qspi->mmap_base + from,
567 op->data.nbytes);
568 }
569
570 mutex_unlock(&qspi->list_lock);
571
572 return ret;
573}
574
575static const struct spi_controller_mem_ops ti_qspi_mem_ops = {
576 .exec_op = ti_qspi_exec_mem_op,
577};
578
579static int ti_qspi_start_transfer_one(struct spi_master *master,
580 struct spi_message *m)
581{
582 struct ti_qspi *qspi = spi_master_get_devdata(master);
583 struct spi_device *spi = m->spi;
584 struct spi_transfer *t;
585 int status = 0, ret;
586 unsigned int frame_len_words, transfer_len_words;
587 int wlen;
588
589 /* setup device control reg */
590 qspi->dc = 0;
591
592 if (spi->mode & SPI_CPHA)
593 qspi->dc |= QSPI_CKPHA(spi->chip_select);
594 if (spi->mode & SPI_CPOL)
595 qspi->dc |= QSPI_CKPOL(spi->chip_select);
596 if (spi->mode & SPI_CS_HIGH)
597 qspi->dc |= QSPI_CSPOL(spi->chip_select);
598
599 frame_len_words = 0;
600 list_for_each_entry(t, &m->transfers, transfer_list)
601 frame_len_words += t->len / (t->bits_per_word >> 3);
602 frame_len_words = min_t(unsigned int, frame_len_words, QSPI_FRAME);
603
604 /* setup command reg */
605 qspi->cmd = 0;
606 qspi->cmd |= QSPI_EN_CS(spi->chip_select);
607 qspi->cmd |= QSPI_FLEN(frame_len_words);
608
609 ti_qspi_write(qspi, qspi->dc, QSPI_SPI_DC_REG);
610
611 mutex_lock(&qspi->list_lock);
612
613 if (qspi->mmap_enabled)
614 ti_qspi_disable_memory_map(spi);
615
616 list_for_each_entry(t, &m->transfers, transfer_list) {
617 qspi->cmd = ((qspi->cmd & ~QSPI_WLEN_MASK) |
618 QSPI_WLEN(t->bits_per_word));
619
620 wlen = t->bits_per_word >> 3;
621 transfer_len_words = min(t->len / wlen, frame_len_words);
622
623 ret = qspi_transfer_msg(qspi, t, transfer_len_words * wlen);
624 if (ret) {
625 dev_dbg(qspi->dev, "transfer message failed\n");
626 mutex_unlock(&qspi->list_lock);
627 return -EINVAL;
628 }
629
630 m->actual_length += transfer_len_words * wlen;
631 frame_len_words -= transfer_len_words;
632 if (frame_len_words == 0)
633 break;
634 }
635
636 mutex_unlock(&qspi->list_lock);
637
638 ti_qspi_write(qspi, qspi->cmd | QSPI_INVAL, QSPI_SPI_CMD_REG);
639 m->status = status;
640 spi_finalize_current_message(master);
641
642 return status;
643}
644
645static int ti_qspi_runtime_resume(struct device *dev)
646{
647 struct ti_qspi *qspi;
648
649 qspi = dev_get_drvdata(dev);
650 ti_qspi_restore_ctx(qspi);
651
652 return 0;
653}
654
655static const struct of_device_id ti_qspi_match[] = {
656 {.compatible = "ti,dra7xxx-qspi" },
657 {.compatible = "ti,am4372-qspi" },
658 {},
659};
660MODULE_DEVICE_TABLE(of, ti_qspi_match);
661
662static int ti_qspi_probe(struct platform_device *pdev)
663{
664 struct ti_qspi *qspi;
665 struct spi_master *master;
666 struct resource *r, *res_mmap;
667 struct device_node *np = pdev->dev.of_node;
668 u32 max_freq;
669 int ret = 0, num_cs, irq;
670 dma_cap_mask_t mask;
671
672 master = spi_alloc_master(&pdev->dev, sizeof(*qspi));
673 if (!master)
674 return -ENOMEM;
675
676 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD;
677
678 master->flags = SPI_MASTER_HALF_DUPLEX;
679 master->setup = ti_qspi_setup;
680 master->auto_runtime_pm = true;
681 master->transfer_one_message = ti_qspi_start_transfer_one;
682 master->dev.of_node = pdev->dev.of_node;
683 master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) |
684 SPI_BPW_MASK(8);
685 master->mem_ops = &ti_qspi_mem_ops;
686
687 if (!of_property_read_u32(np, "num-cs", &num_cs))
688 master->num_chipselect = num_cs;
689
690 qspi = spi_master_get_devdata(master);
691 qspi->master = master;
692 qspi->dev = &pdev->dev;
693 platform_set_drvdata(pdev, qspi);
694
695 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_base");
696 if (r == NULL) {
697 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
698 if (r == NULL) {
699 dev_err(&pdev->dev, "missing platform data\n");
700 ret = -ENODEV;
701 goto free_master;
702 }
703 }
704
705 res_mmap = platform_get_resource_byname(pdev,
706 IORESOURCE_MEM, "qspi_mmap");
707 if (res_mmap == NULL) {
708 res_mmap = platform_get_resource(pdev, IORESOURCE_MEM, 1);
709 if (res_mmap == NULL) {
710 dev_err(&pdev->dev,
711 "memory mapped resource not required\n");
712 }
713 }
714
715 if (res_mmap)
716 qspi->mmap_size = resource_size(res_mmap);
717
718 irq = platform_get_irq(pdev, 0);
719 if (irq < 0) {
720 ret = irq;
721 goto free_master;
722 }
723
724 mutex_init(&qspi->list_lock);
725
726 qspi->base = devm_ioremap_resource(&pdev->dev, r);
727 if (IS_ERR(qspi->base)) {
728 ret = PTR_ERR(qspi->base);
729 goto free_master;
730 }
731
732
733 if (of_property_read_bool(np, "syscon-chipselects")) {
734 qspi->ctrl_base =
735 syscon_regmap_lookup_by_phandle(np,
736 "syscon-chipselects");
737 if (IS_ERR(qspi->ctrl_base)) {
738 ret = PTR_ERR(qspi->ctrl_base);
739 goto free_master;
740 }
741 ret = of_property_read_u32_index(np,
742 "syscon-chipselects",
743 1, &qspi->ctrl_reg);
744 if (ret) {
745 dev_err(&pdev->dev,
746 "couldn't get ctrl_mod reg index\n");
747 goto free_master;
748 }
749 }
750
751 qspi->fclk = devm_clk_get(&pdev->dev, "fck");
752 if (IS_ERR(qspi->fclk)) {
753 ret = PTR_ERR(qspi->fclk);
754 dev_err(&pdev->dev, "could not get clk: %d\n", ret);
755 }
756
757 pm_runtime_use_autosuspend(&pdev->dev);
758 pm_runtime_set_autosuspend_delay(&pdev->dev, QSPI_AUTOSUSPEND_TIMEOUT);
759 pm_runtime_enable(&pdev->dev);
760
761 if (!of_property_read_u32(np, "spi-max-frequency", &max_freq))
762 qspi->spi_max_frequency = max_freq;
763
764 dma_cap_zero(mask);
765 dma_cap_set(DMA_MEMCPY, mask);
766
767 qspi->rx_chan = dma_request_chan_by_mask(&mask);
768 if (IS_ERR(qspi->rx_chan)) {
769 dev_err(qspi->dev,
770 "No Rx DMA available, trying mmap mode\n");
771 qspi->rx_chan = NULL;
772 ret = 0;
773 goto no_dma;
774 }
775 qspi->rx_bb_addr = dma_alloc_coherent(qspi->dev,
776 QSPI_DMA_BUFFER_SIZE,
777 &qspi->rx_bb_dma_addr,
778 GFP_KERNEL | GFP_DMA);
779 if (!qspi->rx_bb_addr) {
780 dev_err(qspi->dev,
781 "dma_alloc_coherent failed, using PIO mode\n");
782 dma_release_channel(qspi->rx_chan);
783 goto no_dma;
784 }
785 master->dma_rx = qspi->rx_chan;
786 init_completion(&qspi->transfer_complete);
787 if (res_mmap)
788 qspi->mmap_phys_base = (dma_addr_t)res_mmap->start;
789
790no_dma:
791 if (!qspi->rx_chan && res_mmap) {
792 qspi->mmap_base = devm_ioremap_resource(&pdev->dev, res_mmap);
793 if (IS_ERR(qspi->mmap_base)) {
794 dev_info(&pdev->dev,
795 "mmap failed with error %ld using PIO mode\n",
796 PTR_ERR(qspi->mmap_base));
797 qspi->mmap_base = NULL;
798 master->mem_ops = NULL;
799 }
800 }
801 qspi->mmap_enabled = false;
802
803 ret = devm_spi_register_master(&pdev->dev, master);
804 if (!ret)
805 return 0;
806
807 pm_runtime_disable(&pdev->dev);
808free_master:
809 spi_master_put(master);
810 return ret;
811}
812
813static int ti_qspi_remove(struct platform_device *pdev)
814{
815 struct ti_qspi *qspi = platform_get_drvdata(pdev);
816 int rc;
817
818 rc = spi_master_suspend(qspi->master);
819 if (rc)
820 return rc;
821
822 pm_runtime_put_sync(&pdev->dev);
823 pm_runtime_disable(&pdev->dev);
824
825 if (qspi->rx_bb_addr)
826 dma_free_coherent(qspi->dev, QSPI_DMA_BUFFER_SIZE,
827 qspi->rx_bb_addr,
828 qspi->rx_bb_dma_addr);
829 if (qspi->rx_chan)
830 dma_release_channel(qspi->rx_chan);
831
832 return 0;
833}
834
835static const struct dev_pm_ops ti_qspi_pm_ops = {
836 .runtime_resume = ti_qspi_runtime_resume,
837};
838
839static struct platform_driver ti_qspi_driver = {
840 .probe = ti_qspi_probe,
841 .remove = ti_qspi_remove,
842 .driver = {
843 .name = "ti-qspi",
844 .pm = &ti_qspi_pm_ops,
845 .of_match_table = ti_qspi_match,
846 }
847};
848
849module_platform_driver(ti_qspi_driver);
850
851MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>");
852MODULE_LICENSE("GPL v2");
853MODULE_DESCRIPTION("TI QSPI controller driver");
854MODULE_ALIAS("platform:ti-qspi");