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[thirdparty/kernel/stable.git] / drivers / mmc / host / sdhci-omap.c
1 /**
2 * SDHCI Controller driver for TI's OMAP SoCs
3 *
4 * Copyright (C) 2017 Texas Instruments
5 * Author: Kishon Vijay Abraham I <kishon@ti.com>
6 *
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 of
9 * the License as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include <linux/delay.h>
21 #include <linux/mmc/slot-gpio.h>
22 #include <linux/module.h>
23 #include <linux/of.h>
24 #include <linux/of_device.h>
25 #include <linux/platform_device.h>
26 #include <linux/pm_runtime.h>
27 #include <linux/regulator/consumer.h>
28 #include <linux/pinctrl/consumer.h>
29 #include <linux/sys_soc.h>
30 #include <linux/thermal.h>
31
32 #include "sdhci-pltfm.h"
33
34 #define SDHCI_OMAP_CON 0x12c
35 #define CON_DW8 BIT(5)
36 #define CON_DMA_MASTER BIT(20)
37 #define CON_DDR BIT(19)
38 #define CON_CLKEXTFREE BIT(16)
39 #define CON_PADEN BIT(15)
40 #define CON_CTPL BIT(11)
41 #define CON_INIT BIT(1)
42 #define CON_OD BIT(0)
43
44 #define SDHCI_OMAP_DLL 0x0134
45 #define DLL_SWT BIT(20)
46 #define DLL_FORCE_SR_C_SHIFT 13
47 #define DLL_FORCE_SR_C_MASK (0x7f << DLL_FORCE_SR_C_SHIFT)
48 #define DLL_FORCE_VALUE BIT(12)
49 #define DLL_CALIB BIT(1)
50
51 #define SDHCI_OMAP_CMD 0x20c
52
53 #define SDHCI_OMAP_PSTATE 0x0224
54 #define PSTATE_DLEV_DAT0 BIT(20)
55 #define PSTATE_DATI BIT(1)
56
57 #define SDHCI_OMAP_HCTL 0x228
58 #define HCTL_SDBP BIT(8)
59 #define HCTL_SDVS_SHIFT 9
60 #define HCTL_SDVS_MASK (0x7 << HCTL_SDVS_SHIFT)
61 #define HCTL_SDVS_33 (0x7 << HCTL_SDVS_SHIFT)
62 #define HCTL_SDVS_30 (0x6 << HCTL_SDVS_SHIFT)
63 #define HCTL_SDVS_18 (0x5 << HCTL_SDVS_SHIFT)
64
65 #define SDHCI_OMAP_SYSCTL 0x22c
66 #define SYSCTL_CEN BIT(2)
67 #define SYSCTL_CLKD_SHIFT 6
68 #define SYSCTL_CLKD_MASK 0x3ff
69
70 #define SDHCI_OMAP_STAT 0x230
71
72 #define SDHCI_OMAP_IE 0x234
73 #define INT_CC_EN BIT(0)
74
75 #define SDHCI_OMAP_AC12 0x23c
76 #define AC12_V1V8_SIGEN BIT(19)
77 #define AC12_SCLK_SEL BIT(23)
78
79 #define SDHCI_OMAP_CAPA 0x240
80 #define CAPA_VS33 BIT(24)
81 #define CAPA_VS30 BIT(25)
82 #define CAPA_VS18 BIT(26)
83
84 #define SDHCI_OMAP_CAPA2 0x0244
85 #define CAPA2_TSDR50 BIT(13)
86
87 #define SDHCI_OMAP_TIMEOUT 1 /* 1 msec */
88
89 #define SYSCTL_CLKD_MAX 0x3FF
90
91 #define IOV_1V8 1800000 /* 180000 uV */
92 #define IOV_3V0 3000000 /* 300000 uV */
93 #define IOV_3V3 3300000 /* 330000 uV */
94
95 #define MAX_PHASE_DELAY 0x7C
96
97 /* sdhci-omap controller flags */
98 #define SDHCI_OMAP_REQUIRE_IODELAY BIT(0)
99
100 struct sdhci_omap_data {
101 u32 offset;
102 u8 flags;
103 };
104
105 struct sdhci_omap_host {
106 char *version;
107 void __iomem *base;
108 struct device *dev;
109 struct regulator *pbias;
110 bool pbias_enabled;
111 struct sdhci_host *host;
112 u8 bus_mode;
113 u8 power_mode;
114 u8 timing;
115 u8 flags;
116
117 struct pinctrl *pinctrl;
118 struct pinctrl_state **pinctrl_state;
119 bool is_tuning;
120 };
121
122 static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host);
123 static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host);
124
125 static inline u32 sdhci_omap_readl(struct sdhci_omap_host *host,
126 unsigned int offset)
127 {
128 return readl(host->base + offset);
129 }
130
131 static inline void sdhci_omap_writel(struct sdhci_omap_host *host,
132 unsigned int offset, u32 data)
133 {
134 writel(data, host->base + offset);
135 }
136
137 static int sdhci_omap_set_pbias(struct sdhci_omap_host *omap_host,
138 bool power_on, unsigned int iov)
139 {
140 int ret;
141 struct device *dev = omap_host->dev;
142
143 if (IS_ERR(omap_host->pbias))
144 return 0;
145
146 if (power_on) {
147 ret = regulator_set_voltage(omap_host->pbias, iov, iov);
148 if (ret) {
149 dev_err(dev, "pbias set voltage failed\n");
150 return ret;
151 }
152
153 if (omap_host->pbias_enabled)
154 return 0;
155
156 ret = regulator_enable(omap_host->pbias);
157 if (ret) {
158 dev_err(dev, "pbias reg enable fail\n");
159 return ret;
160 }
161
162 omap_host->pbias_enabled = true;
163 } else {
164 if (!omap_host->pbias_enabled)
165 return 0;
166
167 ret = regulator_disable(omap_host->pbias);
168 if (ret) {
169 dev_err(dev, "pbias reg disable fail\n");
170 return ret;
171 }
172 omap_host->pbias_enabled = false;
173 }
174
175 return 0;
176 }
177
178 static int sdhci_omap_enable_iov(struct sdhci_omap_host *omap_host,
179 unsigned int iov)
180 {
181 int ret;
182 struct sdhci_host *host = omap_host->host;
183 struct mmc_host *mmc = host->mmc;
184
185 ret = sdhci_omap_set_pbias(omap_host, false, 0);
186 if (ret)
187 return ret;
188
189 if (!IS_ERR(mmc->supply.vqmmc)) {
190 ret = regulator_set_voltage(mmc->supply.vqmmc, iov, iov);
191 if (ret) {
192 dev_err(mmc_dev(mmc), "vqmmc set voltage failed\n");
193 return ret;
194 }
195 }
196
197 ret = sdhci_omap_set_pbias(omap_host, true, iov);
198 if (ret)
199 return ret;
200
201 return 0;
202 }
203
204 static void sdhci_omap_conf_bus_power(struct sdhci_omap_host *omap_host,
205 unsigned char signal_voltage)
206 {
207 u32 reg;
208 ktime_t timeout;
209
210 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL);
211 reg &= ~HCTL_SDVS_MASK;
212
213 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
214 reg |= HCTL_SDVS_33;
215 else
216 reg |= HCTL_SDVS_18;
217
218 sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);
219
220 reg |= HCTL_SDBP;
221 sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);
222
223 /* wait 1ms */
224 timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
225 while (1) {
226 bool timedout = ktime_after(ktime_get(), timeout);
227
228 if (sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL) & HCTL_SDBP)
229 break;
230 if (WARN_ON(timedout))
231 return;
232 usleep_range(5, 10);
233 }
234 }
235
236 static void sdhci_omap_enable_sdio_irq(struct mmc_host *mmc, int enable)
237 {
238 struct sdhci_host *host = mmc_priv(mmc);
239 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
240 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
241 u32 reg;
242
243 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
244 if (enable)
245 reg |= (CON_CTPL | CON_CLKEXTFREE);
246 else
247 reg &= ~(CON_CTPL | CON_CLKEXTFREE);
248 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
249
250 sdhci_enable_sdio_irq(mmc, enable);
251 }
252
253 static inline void sdhci_omap_set_dll(struct sdhci_omap_host *omap_host,
254 int count)
255 {
256 int i;
257 u32 reg;
258
259 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
260 reg |= DLL_FORCE_VALUE;
261 reg &= ~DLL_FORCE_SR_C_MASK;
262 reg |= (count << DLL_FORCE_SR_C_SHIFT);
263 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
264
265 reg |= DLL_CALIB;
266 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
267 for (i = 0; i < 1000; i++) {
268 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
269 if (reg & DLL_CALIB)
270 break;
271 }
272 reg &= ~DLL_CALIB;
273 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
274 }
275
276 static void sdhci_omap_disable_tuning(struct sdhci_omap_host *omap_host)
277 {
278 u32 reg;
279
280 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
281 reg &= ~AC12_SCLK_SEL;
282 sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
283
284 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
285 reg &= ~(DLL_FORCE_VALUE | DLL_SWT);
286 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
287 }
288
289 static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode)
290 {
291 struct sdhci_host *host = mmc_priv(mmc);
292 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
293 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
294 struct thermal_zone_device *thermal_dev;
295 struct device *dev = omap_host->dev;
296 struct mmc_ios *ios = &mmc->ios;
297 u32 start_window = 0, max_window = 0;
298 bool single_point_failure = false;
299 bool dcrc_was_enabled = false;
300 u8 cur_match, prev_match = 0;
301 u32 length = 0, max_len = 0;
302 u32 phase_delay = 0;
303 int temperature;
304 int ret = 0;
305 u32 reg;
306 int i;
307
308 /* clock tuning is not needed for upto 52MHz */
309 if (ios->clock <= 52000000)
310 return 0;
311
312 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA2);
313 if (ios->timing == MMC_TIMING_UHS_SDR50 && !(reg & CAPA2_TSDR50))
314 return 0;
315
316 thermal_dev = thermal_zone_get_zone_by_name("cpu_thermal");
317 if (IS_ERR(thermal_dev)) {
318 dev_err(dev, "Unable to get thermal zone for tuning\n");
319 return PTR_ERR(thermal_dev);
320 }
321
322 ret = thermal_zone_get_temp(thermal_dev, &temperature);
323 if (ret)
324 return ret;
325
326 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
327 reg |= DLL_SWT;
328 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
329
330 /*
331 * OMAP5/DRA74X/DRA72x Errata i802:
332 * DCRC error interrupts (MMCHS_STAT[21] DCRC=0x1) can occur
333 * during the tuning procedure. So disable it during the
334 * tuning procedure.
335 */
336 if (host->ier & SDHCI_INT_DATA_CRC) {
337 host->ier &= ~SDHCI_INT_DATA_CRC;
338 dcrc_was_enabled = true;
339 }
340
341 omap_host->is_tuning = true;
342
343 /*
344 * Stage 1: Search for a maximum pass window ignoring any
345 * any single point failures. If the tuning value ends up
346 * near it, move away from it in stage 2 below
347 */
348 while (phase_delay <= MAX_PHASE_DELAY) {
349 sdhci_omap_set_dll(omap_host, phase_delay);
350
351 cur_match = !mmc_send_tuning(mmc, opcode, NULL);
352 if (cur_match) {
353 if (prev_match) {
354 length++;
355 } else if (single_point_failure) {
356 /* ignore single point failure */
357 length++;
358 } else {
359 start_window = phase_delay;
360 length = 1;
361 }
362 } else {
363 single_point_failure = prev_match;
364 }
365
366 if (length > max_len) {
367 max_window = start_window;
368 max_len = length;
369 }
370
371 prev_match = cur_match;
372 phase_delay += 4;
373 }
374
375 if (!max_len) {
376 dev_err(dev, "Unable to find match\n");
377 ret = -EIO;
378 goto tuning_error;
379 }
380
381 /*
382 * Assign tuning value as a ratio of maximum pass window based
383 * on temperature
384 */
385 if (temperature < -20000)
386 phase_delay = min(max_window + 4 * max_len - 24,
387 max_window +
388 DIV_ROUND_UP(13 * max_len, 16) * 4);
389 else if (temperature < 20000)
390 phase_delay = max_window + DIV_ROUND_UP(9 * max_len, 16) * 4;
391 else if (temperature < 40000)
392 phase_delay = max_window + DIV_ROUND_UP(8 * max_len, 16) * 4;
393 else if (temperature < 70000)
394 phase_delay = max_window + DIV_ROUND_UP(7 * max_len, 16) * 4;
395 else if (temperature < 90000)
396 phase_delay = max_window + DIV_ROUND_UP(5 * max_len, 16) * 4;
397 else if (temperature < 120000)
398 phase_delay = max_window + DIV_ROUND_UP(4 * max_len, 16) * 4;
399 else
400 phase_delay = max_window + DIV_ROUND_UP(3 * max_len, 16) * 4;
401
402 /*
403 * Stage 2: Search for a single point failure near the chosen tuning
404 * value in two steps. First in the +3 to +10 range and then in the
405 * +2 to -10 range. If found, move away from it in the appropriate
406 * direction by the appropriate amount depending on the temperature.
407 */
408 for (i = 3; i <= 10; i++) {
409 sdhci_omap_set_dll(omap_host, phase_delay + i);
410
411 if (mmc_send_tuning(mmc, opcode, NULL)) {
412 if (temperature < 10000)
413 phase_delay += i + 6;
414 else if (temperature < 20000)
415 phase_delay += i - 12;
416 else if (temperature < 70000)
417 phase_delay += i - 8;
418 else
419 phase_delay += i - 6;
420
421 goto single_failure_found;
422 }
423 }
424
425 for (i = 2; i >= -10; i--) {
426 sdhci_omap_set_dll(omap_host, phase_delay + i);
427
428 if (mmc_send_tuning(mmc, opcode, NULL)) {
429 if (temperature < 10000)
430 phase_delay += i + 12;
431 else if (temperature < 20000)
432 phase_delay += i + 8;
433 else if (temperature < 70000)
434 phase_delay += i + 8;
435 else if (temperature < 90000)
436 phase_delay += i + 10;
437 else
438 phase_delay += i + 12;
439
440 goto single_failure_found;
441 }
442 }
443
444 single_failure_found:
445 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
446 if (!(reg & AC12_SCLK_SEL)) {
447 ret = -EIO;
448 goto tuning_error;
449 }
450
451 sdhci_omap_set_dll(omap_host, phase_delay);
452
453 omap_host->is_tuning = false;
454
455 goto ret;
456
457 tuning_error:
458 omap_host->is_tuning = false;
459 dev_err(dev, "Tuning failed\n");
460 sdhci_omap_disable_tuning(omap_host);
461
462 ret:
463 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
464 /* Reenable forbidden interrupt */
465 if (dcrc_was_enabled)
466 host->ier |= SDHCI_INT_DATA_CRC;
467 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
468 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
469 return ret;
470 }
471
472 static int sdhci_omap_card_busy(struct mmc_host *mmc)
473 {
474 u32 reg, ac12;
475 int ret = false;
476 struct sdhci_host *host = mmc_priv(mmc);
477 struct sdhci_pltfm_host *pltfm_host;
478 struct sdhci_omap_host *omap_host;
479 u32 ier = host->ier;
480
481 pltfm_host = sdhci_priv(host);
482 omap_host = sdhci_pltfm_priv(pltfm_host);
483
484 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
485 ac12 = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
486 reg &= ~CON_CLKEXTFREE;
487 if (ac12 & AC12_V1V8_SIGEN)
488 reg |= CON_CLKEXTFREE;
489 reg |= CON_PADEN;
490 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
491
492 disable_irq(host->irq);
493 ier |= SDHCI_INT_CARD_INT;
494 sdhci_writel(host, ier, SDHCI_INT_ENABLE);
495 sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);
496
497 /*
498 * Delay is required for PSTATE to correctly reflect
499 * DLEV/CLEV values after PADEN is set.
500 */
501 usleep_range(50, 100);
502 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_PSTATE);
503 if ((reg & PSTATE_DATI) || !(reg & PSTATE_DLEV_DAT0))
504 ret = true;
505
506 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
507 reg &= ~(CON_CLKEXTFREE | CON_PADEN);
508 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
509
510 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
511 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
512 enable_irq(host->irq);
513
514 return ret;
515 }
516
517 static int sdhci_omap_start_signal_voltage_switch(struct mmc_host *mmc,
518 struct mmc_ios *ios)
519 {
520 u32 reg;
521 int ret;
522 unsigned int iov;
523 struct sdhci_host *host = mmc_priv(mmc);
524 struct sdhci_pltfm_host *pltfm_host;
525 struct sdhci_omap_host *omap_host;
526 struct device *dev;
527
528 pltfm_host = sdhci_priv(host);
529 omap_host = sdhci_pltfm_priv(pltfm_host);
530 dev = omap_host->dev;
531
532 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
533 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
534 if (!(reg & CAPA_VS33))
535 return -EOPNOTSUPP;
536
537 sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);
538
539 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
540 reg &= ~AC12_V1V8_SIGEN;
541 sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
542
543 iov = IOV_3V3;
544 } else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
545 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
546 if (!(reg & CAPA_VS18))
547 return -EOPNOTSUPP;
548
549 sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);
550
551 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
552 reg |= AC12_V1V8_SIGEN;
553 sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
554
555 iov = IOV_1V8;
556 } else {
557 return -EOPNOTSUPP;
558 }
559
560 ret = sdhci_omap_enable_iov(omap_host, iov);
561 if (ret) {
562 dev_err(dev, "failed to switch IO voltage to %dmV\n", iov);
563 return ret;
564 }
565
566 dev_dbg(dev, "IO voltage switched to %dmV\n", iov);
567 return 0;
568 }
569
570 static void sdhci_omap_set_timing(struct sdhci_omap_host *omap_host, u8 timing)
571 {
572 int ret;
573 struct pinctrl_state *pinctrl_state;
574 struct device *dev = omap_host->dev;
575
576 if (!(omap_host->flags & SDHCI_OMAP_REQUIRE_IODELAY))
577 return;
578
579 if (omap_host->timing == timing)
580 return;
581
582 sdhci_omap_stop_clock(omap_host);
583
584 pinctrl_state = omap_host->pinctrl_state[timing];
585 ret = pinctrl_select_state(omap_host->pinctrl, pinctrl_state);
586 if (ret) {
587 dev_err(dev, "failed to select pinctrl state\n");
588 return;
589 }
590
591 sdhci_omap_start_clock(omap_host);
592 omap_host->timing = timing;
593 }
594
595 static void sdhci_omap_set_power_mode(struct sdhci_omap_host *omap_host,
596 u8 power_mode)
597 {
598 if (omap_host->bus_mode == MMC_POWER_OFF)
599 sdhci_omap_disable_tuning(omap_host);
600 omap_host->power_mode = power_mode;
601 }
602
603 static void sdhci_omap_set_bus_mode(struct sdhci_omap_host *omap_host,
604 unsigned int mode)
605 {
606 u32 reg;
607
608 if (omap_host->bus_mode == mode)
609 return;
610
611 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
612 if (mode == MMC_BUSMODE_OPENDRAIN)
613 reg |= CON_OD;
614 else
615 reg &= ~CON_OD;
616 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
617
618 omap_host->bus_mode = mode;
619 }
620
621 static void sdhci_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
622 {
623 struct sdhci_host *host = mmc_priv(mmc);
624 struct sdhci_pltfm_host *pltfm_host;
625 struct sdhci_omap_host *omap_host;
626
627 pltfm_host = sdhci_priv(host);
628 omap_host = sdhci_pltfm_priv(pltfm_host);
629
630 sdhci_omap_set_bus_mode(omap_host, ios->bus_mode);
631 sdhci_omap_set_timing(omap_host, ios->timing);
632 sdhci_set_ios(mmc, ios);
633 sdhci_omap_set_power_mode(omap_host, ios->power_mode);
634 }
635
636 static u16 sdhci_omap_calc_divisor(struct sdhci_pltfm_host *host,
637 unsigned int clock)
638 {
639 u16 dsor;
640
641 dsor = DIV_ROUND_UP(clk_get_rate(host->clk), clock);
642 if (dsor > SYSCTL_CLKD_MAX)
643 dsor = SYSCTL_CLKD_MAX;
644
645 return dsor;
646 }
647
648 static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host)
649 {
650 u32 reg;
651
652 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
653 reg |= SYSCTL_CEN;
654 sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
655 }
656
657 static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host)
658 {
659 u32 reg;
660
661 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
662 reg &= ~SYSCTL_CEN;
663 sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
664 }
665
666 static void sdhci_omap_set_clock(struct sdhci_host *host, unsigned int clock)
667 {
668 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
669 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
670 unsigned long clkdiv;
671
672 sdhci_omap_stop_clock(omap_host);
673
674 if (!clock)
675 return;
676
677 clkdiv = sdhci_omap_calc_divisor(pltfm_host, clock);
678 clkdiv = (clkdiv & SYSCTL_CLKD_MASK) << SYSCTL_CLKD_SHIFT;
679 sdhci_enable_clk(host, clkdiv);
680
681 sdhci_omap_start_clock(omap_host);
682 }
683
684 static void sdhci_omap_set_power(struct sdhci_host *host, unsigned char mode,
685 unsigned short vdd)
686 {
687 struct mmc_host *mmc = host->mmc;
688
689 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
690 }
691
692 static int sdhci_omap_enable_dma(struct sdhci_host *host)
693 {
694 u32 reg;
695 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
696 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
697
698 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
699 reg |= CON_DMA_MASTER;
700 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
701
702 return 0;
703 }
704
705 static unsigned int sdhci_omap_get_min_clock(struct sdhci_host *host)
706 {
707 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
708
709 return clk_get_rate(pltfm_host->clk) / SYSCTL_CLKD_MAX;
710 }
711
712 static void sdhci_omap_set_bus_width(struct sdhci_host *host, int width)
713 {
714 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
715 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
716 u32 reg;
717
718 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
719 if (width == MMC_BUS_WIDTH_8)
720 reg |= CON_DW8;
721 else
722 reg &= ~CON_DW8;
723 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
724
725 sdhci_set_bus_width(host, width);
726 }
727
728 static void sdhci_omap_init_74_clocks(struct sdhci_host *host, u8 power_mode)
729 {
730 u32 reg;
731 ktime_t timeout;
732 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
733 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
734
735 if (omap_host->power_mode == power_mode)
736 return;
737
738 if (power_mode != MMC_POWER_ON)
739 return;
740
741 disable_irq(host->irq);
742
743 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
744 reg |= CON_INIT;
745 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
746 sdhci_omap_writel(omap_host, SDHCI_OMAP_CMD, 0x0);
747
748 /* wait 1ms */
749 timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
750 while (1) {
751 bool timedout = ktime_after(ktime_get(), timeout);
752
753 if (sdhci_omap_readl(omap_host, SDHCI_OMAP_STAT) & INT_CC_EN)
754 break;
755 if (WARN_ON(timedout))
756 return;
757 usleep_range(5, 10);
758 }
759
760 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
761 reg &= ~CON_INIT;
762 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
763 sdhci_omap_writel(omap_host, SDHCI_OMAP_STAT, INT_CC_EN);
764
765 enable_irq(host->irq);
766 }
767
768 static void sdhci_omap_set_uhs_signaling(struct sdhci_host *host,
769 unsigned int timing)
770 {
771 u32 reg;
772 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
773 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
774
775 sdhci_omap_stop_clock(omap_host);
776
777 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
778 if (timing == MMC_TIMING_UHS_DDR50 || timing == MMC_TIMING_MMC_DDR52)
779 reg |= CON_DDR;
780 else
781 reg &= ~CON_DDR;
782 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
783
784 sdhci_set_uhs_signaling(host, timing);
785 sdhci_omap_start_clock(omap_host);
786 }
787
788 void sdhci_omap_reset(struct sdhci_host *host, u8 mask)
789 {
790 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
791 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
792
793 /* Don't reset data lines during tuning operation */
794 if (omap_host->is_tuning)
795 mask &= ~SDHCI_RESET_DATA;
796
797 sdhci_reset(host, mask);
798 }
799
800 static struct sdhci_ops sdhci_omap_ops = {
801 .set_clock = sdhci_omap_set_clock,
802 .set_power = sdhci_omap_set_power,
803 .enable_dma = sdhci_omap_enable_dma,
804 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
805 .get_min_clock = sdhci_omap_get_min_clock,
806 .set_bus_width = sdhci_omap_set_bus_width,
807 .platform_send_init_74_clocks = sdhci_omap_init_74_clocks,
808 .reset = sdhci_omap_reset,
809 .set_uhs_signaling = sdhci_omap_set_uhs_signaling,
810 };
811
812 static int sdhci_omap_set_capabilities(struct sdhci_omap_host *omap_host)
813 {
814 u32 reg;
815 int ret = 0;
816 struct device *dev = omap_host->dev;
817 struct regulator *vqmmc;
818
819 vqmmc = regulator_get(dev, "vqmmc");
820 if (IS_ERR(vqmmc)) {
821 ret = PTR_ERR(vqmmc);
822 goto reg_put;
823 }
824
825 /* voltage capabilities might be set by boot loader, clear it */
826 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
827 reg &= ~(CAPA_VS18 | CAPA_VS30 | CAPA_VS33);
828
829 if (regulator_is_supported_voltage(vqmmc, IOV_3V3, IOV_3V3))
830 reg |= CAPA_VS33;
831 if (regulator_is_supported_voltage(vqmmc, IOV_1V8, IOV_1V8))
832 reg |= CAPA_VS18;
833
834 sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, reg);
835
836 reg_put:
837 regulator_put(vqmmc);
838
839 return ret;
840 }
841
842 static const struct sdhci_pltfm_data sdhci_omap_pdata = {
843 .quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
844 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
845 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
846 SDHCI_QUIRK_NO_HISPD_BIT |
847 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
848 .quirks2 = SDHCI_QUIRK2_ACMD23_BROKEN |
849 SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
850 SDHCI_QUIRK2_RSP_136_HAS_CRC |
851 SDHCI_QUIRK2_DISABLE_HW_TIMEOUT,
852 .ops = &sdhci_omap_ops,
853 };
854
855 static const struct sdhci_omap_data k2g_data = {
856 .offset = 0x200,
857 };
858
859 static const struct sdhci_omap_data dra7_data = {
860 .offset = 0x200,
861 .flags = SDHCI_OMAP_REQUIRE_IODELAY,
862 };
863
864 static const struct of_device_id omap_sdhci_match[] = {
865 { .compatible = "ti,dra7-sdhci", .data = &dra7_data },
866 { .compatible = "ti,k2g-sdhci", .data = &k2g_data },
867 {},
868 };
869 MODULE_DEVICE_TABLE(of, omap_sdhci_match);
870
871 static struct pinctrl_state
872 *sdhci_omap_iodelay_pinctrl_state(struct sdhci_omap_host *omap_host, char *mode,
873 u32 *caps, u32 capmask)
874 {
875 struct device *dev = omap_host->dev;
876 char *version = omap_host->version;
877 struct pinctrl_state *pinctrl_state = ERR_PTR(-ENODEV);
878 char str[20];
879
880 if (!(*caps & capmask))
881 goto ret;
882
883 if (version) {
884 snprintf(str, 20, "%s-%s", mode, version);
885 pinctrl_state = pinctrl_lookup_state(omap_host->pinctrl, str);
886 }
887
888 if (IS_ERR(pinctrl_state))
889 pinctrl_state = pinctrl_lookup_state(omap_host->pinctrl, mode);
890
891 if (IS_ERR(pinctrl_state)) {
892 dev_err(dev, "no pinctrl state for %s mode", mode);
893 *caps &= ~capmask;
894 }
895
896 ret:
897 return pinctrl_state;
898 }
899
900 static int sdhci_omap_config_iodelay_pinctrl_state(struct sdhci_omap_host
901 *omap_host)
902 {
903 struct device *dev = omap_host->dev;
904 struct sdhci_host *host = omap_host->host;
905 struct mmc_host *mmc = host->mmc;
906 u32 *caps = &mmc->caps;
907 u32 *caps2 = &mmc->caps2;
908 struct pinctrl_state *state;
909 struct pinctrl_state **pinctrl_state;
910
911 if (!(omap_host->flags & SDHCI_OMAP_REQUIRE_IODELAY))
912 return 0;
913
914 pinctrl_state = devm_kcalloc(dev,
915 MMC_TIMING_MMC_HS200 + 1,
916 sizeof(*pinctrl_state),
917 GFP_KERNEL);
918 if (!pinctrl_state)
919 return -ENOMEM;
920
921 omap_host->pinctrl = devm_pinctrl_get(omap_host->dev);
922 if (IS_ERR(omap_host->pinctrl)) {
923 dev_err(dev, "Cannot get pinctrl\n");
924 return PTR_ERR(omap_host->pinctrl);
925 }
926
927 state = pinctrl_lookup_state(omap_host->pinctrl, "default");
928 if (IS_ERR(state)) {
929 dev_err(dev, "no pinctrl state for default mode\n");
930 return PTR_ERR(state);
931 }
932 pinctrl_state[MMC_TIMING_LEGACY] = state;
933
934 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr104", caps,
935 MMC_CAP_UHS_SDR104);
936 if (!IS_ERR(state))
937 pinctrl_state[MMC_TIMING_UHS_SDR104] = state;
938
939 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "ddr50", caps,
940 MMC_CAP_UHS_DDR50);
941 if (!IS_ERR(state))
942 pinctrl_state[MMC_TIMING_UHS_DDR50] = state;
943
944 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr50", caps,
945 MMC_CAP_UHS_SDR50);
946 if (!IS_ERR(state))
947 pinctrl_state[MMC_TIMING_UHS_SDR50] = state;
948
949 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr25", caps,
950 MMC_CAP_UHS_SDR25);
951 if (!IS_ERR(state))
952 pinctrl_state[MMC_TIMING_UHS_SDR25] = state;
953
954 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr12", caps,
955 MMC_CAP_UHS_SDR12);
956 if (!IS_ERR(state))
957 pinctrl_state[MMC_TIMING_UHS_SDR12] = state;
958
959 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "ddr_1_8v", caps,
960 MMC_CAP_1_8V_DDR);
961 if (!IS_ERR(state)) {
962 pinctrl_state[MMC_TIMING_MMC_DDR52] = state;
963 } else {
964 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "ddr_3_3v",
965 caps,
966 MMC_CAP_3_3V_DDR);
967 if (!IS_ERR(state))
968 pinctrl_state[MMC_TIMING_MMC_DDR52] = state;
969 }
970
971 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "hs", caps,
972 MMC_CAP_SD_HIGHSPEED);
973 if (!IS_ERR(state))
974 pinctrl_state[MMC_TIMING_SD_HS] = state;
975
976 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "hs", caps,
977 MMC_CAP_MMC_HIGHSPEED);
978 if (!IS_ERR(state))
979 pinctrl_state[MMC_TIMING_MMC_HS] = state;
980
981 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "hs200_1_8v", caps2,
982 MMC_CAP2_HS200_1_8V_SDR);
983 if (!IS_ERR(state))
984 pinctrl_state[MMC_TIMING_MMC_HS200] = state;
985
986 omap_host->pinctrl_state = pinctrl_state;
987
988 return 0;
989 }
990
991 static const struct soc_device_attribute sdhci_omap_soc_devices[] = {
992 {
993 .machine = "DRA7[45]*",
994 .revision = "ES1.[01]",
995 },
996 {
997 /* sentinel */
998 }
999 };
1000
1001 static int sdhci_omap_probe(struct platform_device *pdev)
1002 {
1003 int ret;
1004 u32 offset;
1005 struct device *dev = &pdev->dev;
1006 struct sdhci_host *host;
1007 struct sdhci_pltfm_host *pltfm_host;
1008 struct sdhci_omap_host *omap_host;
1009 struct mmc_host *mmc;
1010 const struct of_device_id *match;
1011 struct sdhci_omap_data *data;
1012 const struct soc_device_attribute *soc;
1013
1014 match = of_match_device(omap_sdhci_match, dev);
1015 if (!match)
1016 return -EINVAL;
1017
1018 data = (struct sdhci_omap_data *)match->data;
1019 if (!data) {
1020 dev_err(dev, "no sdhci omap data\n");
1021 return -EINVAL;
1022 }
1023 offset = data->offset;
1024
1025 host = sdhci_pltfm_init(pdev, &sdhci_omap_pdata,
1026 sizeof(*omap_host));
1027 if (IS_ERR(host)) {
1028 dev_err(dev, "Failed sdhci_pltfm_init\n");
1029 return PTR_ERR(host);
1030 }
1031
1032 pltfm_host = sdhci_priv(host);
1033 omap_host = sdhci_pltfm_priv(pltfm_host);
1034 omap_host->host = host;
1035 omap_host->base = host->ioaddr;
1036 omap_host->dev = dev;
1037 omap_host->power_mode = MMC_POWER_UNDEFINED;
1038 omap_host->timing = MMC_TIMING_LEGACY;
1039 omap_host->flags = data->flags;
1040 host->ioaddr += offset;
1041
1042 mmc = host->mmc;
1043 sdhci_get_of_property(pdev);
1044 ret = mmc_of_parse(mmc);
1045 if (ret)
1046 goto err_pltfm_free;
1047
1048 soc = soc_device_match(sdhci_omap_soc_devices);
1049 if (soc) {
1050 omap_host->version = "rev11";
1051 if (!strcmp(dev_name(dev), "4809c000.mmc"))
1052 mmc->f_max = 96000000;
1053 if (!strcmp(dev_name(dev), "480b4000.mmc"))
1054 mmc->f_max = 48000000;
1055 if (!strcmp(dev_name(dev), "480ad000.mmc"))
1056 mmc->f_max = 48000000;
1057 }
1058
1059 if (!mmc_can_gpio_ro(mmc))
1060 mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
1061
1062 pltfm_host->clk = devm_clk_get(dev, "fck");
1063 if (IS_ERR(pltfm_host->clk)) {
1064 ret = PTR_ERR(pltfm_host->clk);
1065 goto err_pltfm_free;
1066 }
1067
1068 ret = clk_set_rate(pltfm_host->clk, mmc->f_max);
1069 if (ret) {
1070 dev_err(dev, "failed to set clock to %d\n", mmc->f_max);
1071 goto err_pltfm_free;
1072 }
1073
1074 omap_host->pbias = devm_regulator_get_optional(dev, "pbias");
1075 if (IS_ERR(omap_host->pbias)) {
1076 ret = PTR_ERR(omap_host->pbias);
1077 if (ret != -ENODEV)
1078 goto err_pltfm_free;
1079 dev_dbg(dev, "unable to get pbias regulator %d\n", ret);
1080 }
1081 omap_host->pbias_enabled = false;
1082
1083 /*
1084 * omap_device_pm_domain has callbacks to enable the main
1085 * functional clock, interface clock and also configure the
1086 * SYSCONFIG register of omap devices. The callback will be invoked
1087 * as part of pm_runtime_get_sync.
1088 */
1089 pm_runtime_enable(dev);
1090 ret = pm_runtime_get_sync(dev);
1091 if (ret < 0) {
1092 dev_err(dev, "pm_runtime_get_sync failed\n");
1093 pm_runtime_put_noidle(dev);
1094 goto err_rpm_disable;
1095 }
1096
1097 ret = sdhci_omap_set_capabilities(omap_host);
1098 if (ret) {
1099 dev_err(dev, "failed to set system capabilities\n");
1100 goto err_put_sync;
1101 }
1102
1103 host->mmc_host_ops.start_signal_voltage_switch =
1104 sdhci_omap_start_signal_voltage_switch;
1105 host->mmc_host_ops.set_ios = sdhci_omap_set_ios;
1106 host->mmc_host_ops.card_busy = sdhci_omap_card_busy;
1107 host->mmc_host_ops.execute_tuning = sdhci_omap_execute_tuning;
1108 host->mmc_host_ops.enable_sdio_irq = sdhci_omap_enable_sdio_irq;
1109
1110 ret = sdhci_setup_host(host);
1111 if (ret)
1112 goto err_put_sync;
1113
1114 ret = sdhci_omap_config_iodelay_pinctrl_state(omap_host);
1115 if (ret)
1116 goto err_cleanup_host;
1117
1118 ret = __sdhci_add_host(host);
1119 if (ret)
1120 goto err_cleanup_host;
1121
1122 return 0;
1123
1124 err_cleanup_host:
1125 sdhci_cleanup_host(host);
1126
1127 err_put_sync:
1128 pm_runtime_put_sync(dev);
1129
1130 err_rpm_disable:
1131 pm_runtime_disable(dev);
1132
1133 err_pltfm_free:
1134 sdhci_pltfm_free(pdev);
1135 return ret;
1136 }
1137
1138 static int sdhci_omap_remove(struct platform_device *pdev)
1139 {
1140 struct device *dev = &pdev->dev;
1141 struct sdhci_host *host = platform_get_drvdata(pdev);
1142
1143 sdhci_remove_host(host, true);
1144 pm_runtime_put_sync(dev);
1145 pm_runtime_disable(dev);
1146 sdhci_pltfm_free(pdev);
1147
1148 return 0;
1149 }
1150
1151 static struct platform_driver sdhci_omap_driver = {
1152 .probe = sdhci_omap_probe,
1153 .remove = sdhci_omap_remove,
1154 .driver = {
1155 .name = "sdhci-omap",
1156 .of_match_table = omap_sdhci_match,
1157 },
1158 };
1159
1160 module_platform_driver(sdhci_omap_driver);
1161
1162 MODULE_DESCRIPTION("SDHCI driver for OMAP SoCs");
1163 MODULE_AUTHOR("Texas Instruments Inc.");
1164 MODULE_LICENSE("GPL v2");
1165 MODULE_ALIAS("platform:sdhci_omap");
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git