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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
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
88#define QSPI_CLK_EN (1 << 31)
89#define QSPI_CLK_DIV_MAX 0xffff
90
91
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
104#define WC 0x02
105
106
107#define QSPI_WC_INT_EN (1 << 1)
108#define QSPI_WC_INT_DISABLE (1 << 1)
109
110
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
178 ti_qspi_write(qspi, clk_ctrl_reg, QSPI_SPI_CLOCK_CNTRL_REG);
179
180
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;
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;
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
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
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");
582
