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1// SPDX-License-Identifier: GPL-2.0-only
2/**
3 * SDHCI Controller driver for TI's OMAP SoCs
4 *
5 * Copyright (C) 2017 Texas Instruments
6 * Author: Kishon Vijay Abraham I <kishon@ti.com>
7 */
8
9#include <linux/delay.h>
10#include <linux/mmc/slot-gpio.h>
11#include <linux/module.h>
12#include <linux/of.h>
13#include <linux/of_device.h>
14#include <linux/platform_device.h>
15#include <linux/pm_runtime.h>
16#include <linux/regulator/consumer.h>
17#include <linux/pinctrl/consumer.h>
18#include <linux/sys_soc.h>
19#include <linux/thermal.h>
20
21#include "sdhci-pltfm.h"
22
23#define SDHCI_OMAP_CON 0x12c
24#define CON_DW8 BIT(5)
25#define CON_DMA_MASTER BIT(20)
26#define CON_DDR BIT(19)
27#define CON_CLKEXTFREE BIT(16)
28#define CON_PADEN BIT(15)
29#define CON_CTPL BIT(11)
30#define CON_INIT BIT(1)
31#define CON_OD BIT(0)
32
33#define SDHCI_OMAP_DLL 0x0134
34#define DLL_SWT BIT(20)
35#define DLL_FORCE_SR_C_SHIFT 13
36#define DLL_FORCE_SR_C_MASK (0x7f << DLL_FORCE_SR_C_SHIFT)
37#define DLL_FORCE_VALUE BIT(12)
38#define DLL_CALIB BIT(1)
39
40#define SDHCI_OMAP_CMD 0x20c
41
42#define SDHCI_OMAP_PSTATE 0x0224
43#define PSTATE_DLEV_DAT0 BIT(20)
44#define PSTATE_DATI BIT(1)
45
46#define SDHCI_OMAP_HCTL 0x228
47#define HCTL_SDBP BIT(8)
48#define HCTL_SDVS_SHIFT 9
49#define HCTL_SDVS_MASK (0x7 << HCTL_SDVS_SHIFT)
50#define HCTL_SDVS_33 (0x7 << HCTL_SDVS_SHIFT)
51#define HCTL_SDVS_30 (0x6 << HCTL_SDVS_SHIFT)
52#define HCTL_SDVS_18 (0x5 << HCTL_SDVS_SHIFT)
53
54#define SDHCI_OMAP_SYSCTL 0x22c
55#define SYSCTL_CEN BIT(2)
56#define SYSCTL_CLKD_SHIFT 6
57#define SYSCTL_CLKD_MASK 0x3ff
58
59#define SDHCI_OMAP_STAT 0x230
60
61#define SDHCI_OMAP_IE 0x234
62#define INT_CC_EN BIT(0)
63
64#define SDHCI_OMAP_AC12 0x23c
65#define AC12_V1V8_SIGEN BIT(19)
66#define AC12_SCLK_SEL BIT(23)
67
68#define SDHCI_OMAP_CAPA 0x240
69#define CAPA_VS33 BIT(24)
70#define CAPA_VS30 BIT(25)
71#define CAPA_VS18 BIT(26)
72
73#define SDHCI_OMAP_CAPA2 0x0244
74#define CAPA2_TSDR50 BIT(13)
75
76#define SDHCI_OMAP_TIMEOUT 1 /* 1 msec */
77
78#define SYSCTL_CLKD_MAX 0x3FF
79
80#define IOV_1V8 1800000 /* 180000 uV */
81#define IOV_3V0 3000000 /* 300000 uV */
82#define IOV_3V3 3300000 /* 330000 uV */
83
84#define MAX_PHASE_DELAY 0x7C
85
86/* sdhci-omap controller flags */
87#define SDHCI_OMAP_REQUIRE_IODELAY BIT(0)
88
89struct sdhci_omap_data {
90 u32 offset;
91 u8 flags;
92};
93
94struct sdhci_omap_host {
95 char *version;
96 void __iomem *base;
97 struct device *dev;
98 struct regulator *pbias;
99 bool pbias_enabled;
100 struct sdhci_host *host;
101 u8 bus_mode;
102 u8 power_mode;
103 u8 timing;
104 u8 flags;
105
106 struct pinctrl *pinctrl;
107 struct pinctrl_state **pinctrl_state;
108 bool is_tuning;
109};
110
111static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host);
112static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host);
113
114static inline u32 sdhci_omap_readl(struct sdhci_omap_host *host,
115 unsigned int offset)
116{
117 return readl(host->base + offset);
118}
119
120static inline void sdhci_omap_writel(struct sdhci_omap_host *host,
121 unsigned int offset, u32 data)
122{
123 writel(data, host->base + offset);
124}
125
126static int sdhci_omap_set_pbias(struct sdhci_omap_host *omap_host,
127 bool power_on, unsigned int iov)
128{
129 int ret;
130 struct device *dev = omap_host->dev;
131
132 if (IS_ERR(omap_host->pbias))
133 return 0;
134
135 if (power_on) {
136 ret = regulator_set_voltage(omap_host->pbias, iov, iov);
137 if (ret) {
138 dev_err(dev, "pbias set voltage failed\n");
139 return ret;
140 }
141
142 if (omap_host->pbias_enabled)
143 return 0;
144
145 ret = regulator_enable(omap_host->pbias);
146 if (ret) {
147 dev_err(dev, "pbias reg enable fail\n");
148 return ret;
149 }
150
151 omap_host->pbias_enabled = true;
152 } else {
153 if (!omap_host->pbias_enabled)
154 return 0;
155
156 ret = regulator_disable(omap_host->pbias);
157 if (ret) {
158 dev_err(dev, "pbias reg disable fail\n");
159 return ret;
160 }
161 omap_host->pbias_enabled = false;
162 }
163
164 return 0;
165}
166
167static int sdhci_omap_enable_iov(struct sdhci_omap_host *omap_host,
168 unsigned int iov)
169{
170 int ret;
171 struct sdhci_host *host = omap_host->host;
172 struct mmc_host *mmc = host->mmc;
173
174 ret = sdhci_omap_set_pbias(omap_host, false, 0);
175 if (ret)
176 return ret;
177
178 if (!IS_ERR(mmc->supply.vqmmc)) {
179 ret = regulator_set_voltage(mmc->supply.vqmmc, iov, iov);
180 if (ret) {
181 dev_err(mmc_dev(mmc), "vqmmc set voltage failed\n");
182 return ret;
183 }
184 }
185
186 ret = sdhci_omap_set_pbias(omap_host, true, iov);
187 if (ret)
188 return ret;
189
190 return 0;
191}
192
193static void sdhci_omap_conf_bus_power(struct sdhci_omap_host *omap_host,
194 unsigned char signal_voltage)
195{
196 u32 reg;
197 ktime_t timeout;
198
199 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL);
200 reg &= ~HCTL_SDVS_MASK;
201
202 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
203 reg |= HCTL_SDVS_33;
204 else
205 reg |= HCTL_SDVS_18;
206
207 sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);
208
209 reg |= HCTL_SDBP;
210 sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);
211
212 /* wait 1ms */
213 timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
214 while (1) {
215 bool timedout = ktime_after(ktime_get(), timeout);
216
217 if (sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL) & HCTL_SDBP)
218 break;
219 if (WARN_ON(timedout))
220 return;
221 usleep_range(5, 10);
222 }
223}
224
225static void sdhci_omap_enable_sdio_irq(struct mmc_host *mmc, int enable)
226{
227 struct sdhci_host *host = mmc_priv(mmc);
228 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
229 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
230 u32 reg;
231
232 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
233 if (enable)
234 reg |= (CON_CTPL | CON_CLKEXTFREE);
235 else
236 reg &= ~(CON_CTPL | CON_CLKEXTFREE);
237 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
238
239 sdhci_enable_sdio_irq(mmc, enable);
240}
241
242static inline void sdhci_omap_set_dll(struct sdhci_omap_host *omap_host,
243 int count)
244{
245 int i;
246 u32 reg;
247
248 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
249 reg |= DLL_FORCE_VALUE;
250 reg &= ~DLL_FORCE_SR_C_MASK;
251 reg |= (count << DLL_FORCE_SR_C_SHIFT);
252 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
253
254 reg |= DLL_CALIB;
255 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
256 for (i = 0; i < 1000; i++) {
257 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
258 if (reg & DLL_CALIB)
259 break;
260 }
261 reg &= ~DLL_CALIB;
262 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
263}
264
265static void sdhci_omap_disable_tuning(struct sdhci_omap_host *omap_host)
266{
267 u32 reg;
268
269 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
270 reg &= ~AC12_SCLK_SEL;
271 sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
272
273 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
274 reg &= ~(DLL_FORCE_VALUE | DLL_SWT);
275 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
276}
277
278static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode)
279{
280 struct sdhci_host *host = mmc_priv(mmc);
281 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
282 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
283 struct thermal_zone_device *thermal_dev;
284 struct device *dev = omap_host->dev;
285 struct mmc_ios *ios = &mmc->ios;
286 u32 start_window = 0, max_window = 0;
287 bool single_point_failure = false;
288 bool dcrc_was_enabled = false;
289 u8 cur_match, prev_match = 0;
290 u32 length = 0, max_len = 0;
291 u32 phase_delay = 0;
292 int temperature;
293 int ret = 0;
294 u32 reg;
295 int i;
296
297 /* clock tuning is not needed for upto 52MHz */
298 if (ios->clock <= 52000000)
299 return 0;
300
301 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA2);
302 if (ios->timing == MMC_TIMING_UHS_SDR50 && !(reg & CAPA2_TSDR50))
303 return 0;
304
305 thermal_dev = thermal_zone_get_zone_by_name("cpu_thermal");
306 if (IS_ERR(thermal_dev)) {
307 dev_err(dev, "Unable to get thermal zone for tuning\n");
308 return PTR_ERR(thermal_dev);
309 }
310
311 ret = thermal_zone_get_temp(thermal_dev, &temperature);
312 if (ret)
313 return ret;
314
315 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
316 reg |= DLL_SWT;
317 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
318
319 /*
320 * OMAP5/DRA74X/DRA72x Errata i802:
321 * DCRC error interrupts (MMCHS_STAT[21] DCRC=0x1) can occur
322 * during the tuning procedure. So disable it during the
323 * tuning procedure.
324 */
325 if (host->ier & SDHCI_INT_DATA_CRC) {
326 host->ier &= ~SDHCI_INT_DATA_CRC;
327 dcrc_was_enabled = true;
328 }
329
330 omap_host->is_tuning = true;
331
332 /*
333 * Stage 1: Search for a maximum pass window ignoring any
334 * any single point failures. If the tuning value ends up
335 * near it, move away from it in stage 2 below
336 */
337 while (phase_delay <= MAX_PHASE_DELAY) {
338 sdhci_omap_set_dll(omap_host, phase_delay);
339
340 cur_match = !mmc_send_tuning(mmc, opcode, NULL);
341 if (cur_match) {
342 if (prev_match) {
343 length++;
344 } else if (single_point_failure) {
345 /* ignore single point failure */
346 length++;
347 } else {
348 start_window = phase_delay;
349 length = 1;
350 }
351 } else {
352 single_point_failure = prev_match;
353 }
354
355 if (length > max_len) {
356 max_window = start_window;
357 max_len = length;
358 }
359
360 prev_match = cur_match;
361 phase_delay += 4;
362 }
363
364 if (!max_len) {
365 dev_err(dev, "Unable to find match\n");
366 ret = -EIO;
367 goto tuning_error;
368 }
369
370 /*
371 * Assign tuning value as a ratio of maximum pass window based
372 * on temperature
373 */
374 if (temperature < -20000)
375 phase_delay = min(max_window + 4 * (max_len - 1) - 24,
376 max_window +
377 DIV_ROUND_UP(13 * max_len, 16) * 4);
378 else if (temperature < 20000)
379 phase_delay = max_window + DIV_ROUND_UP(9 * max_len, 16) * 4;
380 else if (temperature < 40000)
381 phase_delay = max_window + DIV_ROUND_UP(8 * max_len, 16) * 4;
382 else if (temperature < 70000)
383 phase_delay = max_window + DIV_ROUND_UP(7 * max_len, 16) * 4;
384 else if (temperature < 90000)
385 phase_delay = max_window + DIV_ROUND_UP(5 * max_len, 16) * 4;
386 else if (temperature < 120000)
387 phase_delay = max_window + DIV_ROUND_UP(4 * max_len, 16) * 4;
388 else
389 phase_delay = max_window + DIV_ROUND_UP(3 * max_len, 16) * 4;
390
391 /*
392 * Stage 2: Search for a single point failure near the chosen tuning
393 * value in two steps. First in the +3 to +10 range and then in the
394 * +2 to -10 range. If found, move away from it in the appropriate
395 * direction by the appropriate amount depending on the temperature.
396 */
397 for (i = 3; i <= 10; i++) {
398 sdhci_omap_set_dll(omap_host, phase_delay + i);
399
400 if (mmc_send_tuning(mmc, opcode, NULL)) {
401 if (temperature < 10000)
402 phase_delay += i + 6;
403 else if (temperature < 20000)
404 phase_delay += i - 12;
405 else if (temperature < 70000)
406 phase_delay += i - 8;
407 else
408 phase_delay += i - 6;
409
410 goto single_failure_found;
411 }
412 }
413
414 for (i = 2; i >= -10; i--) {
415 sdhci_omap_set_dll(omap_host, phase_delay + i);
416
417 if (mmc_send_tuning(mmc, opcode, NULL)) {
418 if (temperature < 10000)
419 phase_delay += i + 12;
420 else if (temperature < 20000)
421 phase_delay += i + 8;
422 else if (temperature < 70000)
423 phase_delay += i + 8;
424 else if (temperature < 90000)
425 phase_delay += i + 10;
426 else
427 phase_delay += i + 12;
428
429 goto single_failure_found;
430 }
431 }
432
433single_failure_found:
434 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
435 if (!(reg & AC12_SCLK_SEL)) {
436 ret = -EIO;
437 goto tuning_error;
438 }
439
440 sdhci_omap_set_dll(omap_host, phase_delay);
441
442 omap_host->is_tuning = false;
443
444 goto ret;
445
446tuning_error:
447 omap_host->is_tuning = false;
448 dev_err(dev, "Tuning failed\n");
449 sdhci_omap_disable_tuning(omap_host);
450
451ret:
452 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
453 /* Reenable forbidden interrupt */
454 if (dcrc_was_enabled)
455 host->ier |= SDHCI_INT_DATA_CRC;
456 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
457 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
458 return ret;
459}
460
461static int sdhci_omap_card_busy(struct mmc_host *mmc)
462{
463 u32 reg, ac12;
464 int ret = false;
465 struct sdhci_host *host = mmc_priv(mmc);
466 struct sdhci_pltfm_host *pltfm_host;
467 struct sdhci_omap_host *omap_host;
468 u32 ier = host->ier;
469
470 pltfm_host = sdhci_priv(host);
471 omap_host = sdhci_pltfm_priv(pltfm_host);
472
473 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
474 ac12 = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
475 reg &= ~CON_CLKEXTFREE;
476 if (ac12 & AC12_V1V8_SIGEN)
477 reg |= CON_CLKEXTFREE;
478 reg |= CON_PADEN;
479 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
480
481 disable_irq(host->irq);
482 ier |= SDHCI_INT_CARD_INT;
483 sdhci_writel(host, ier, SDHCI_INT_ENABLE);
484 sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);
485
486 /*
487 * Delay is required for PSTATE to correctly reflect
488 * DLEV/CLEV values after PADEN is set.
489 */
490 usleep_range(50, 100);
491 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_PSTATE);
492 if ((reg & PSTATE_DATI) || !(reg & PSTATE_DLEV_DAT0))
493 ret = true;
494
495 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
496 reg &= ~(CON_CLKEXTFREE | CON_PADEN);
497 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
498
499 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
500 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
501 enable_irq(host->irq);
502
503 return ret;
504}
505
506static int sdhci_omap_start_signal_voltage_switch(struct mmc_host *mmc,
507 struct mmc_ios *ios)
508{
509 u32 reg;
510 int ret;
511 unsigned int iov;
512 struct sdhci_host *host = mmc_priv(mmc);
513 struct sdhci_pltfm_host *pltfm_host;
514 struct sdhci_omap_host *omap_host;
515 struct device *dev;
516
517 pltfm_host = sdhci_priv(host);
518 omap_host = sdhci_pltfm_priv(pltfm_host);
519 dev = omap_host->dev;
520
521 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
522 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
523 if (!(reg & CAPA_VS33))
524 return -EOPNOTSUPP;
525
526 sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);
527
528 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
529 reg &= ~AC12_V1V8_SIGEN;
530 sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
531
532 iov = IOV_3V3;
533 } else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
534 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
535 if (!(reg & CAPA_VS18))
536 return -EOPNOTSUPP;
537
538 sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);
539
540 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
541 reg |= AC12_V1V8_SIGEN;
542 sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
543
544 iov = IOV_1V8;
545 } else {
546 return -EOPNOTSUPP;
547 }
548
549 ret = sdhci_omap_enable_iov(omap_host, iov);
550 if (ret) {
551 dev_err(dev, "failed to switch IO voltage to %dmV\n", iov);
552 return ret;
553 }
554
555 dev_dbg(dev, "IO voltage switched to %dmV\n", iov);
556 return 0;
557}
558
559static void sdhci_omap_set_timing(struct sdhci_omap_host *omap_host, u8 timing)
560{
561 int ret;
562 struct pinctrl_state *pinctrl_state;
563 struct device *dev = omap_host->dev;
564
565 if (!(omap_host->flags & SDHCI_OMAP_REQUIRE_IODELAY))
566 return;
567
568 if (omap_host->timing == timing)
569 return;
570
571 sdhci_omap_stop_clock(omap_host);
572
573 pinctrl_state = omap_host->pinctrl_state[timing];
574 ret = pinctrl_select_state(omap_host->pinctrl, pinctrl_state);
575 if (ret) {
576 dev_err(dev, "failed to select pinctrl state\n");
577 return;
578 }
579
580 sdhci_omap_start_clock(omap_host);
581 omap_host->timing = timing;
582}
583
584static void sdhci_omap_set_power_mode(struct sdhci_omap_host *omap_host,
585 u8 power_mode)
586{
587 if (omap_host->bus_mode == MMC_POWER_OFF)
588 sdhci_omap_disable_tuning(omap_host);
589 omap_host->power_mode = power_mode;
590}
591
592static void sdhci_omap_set_bus_mode(struct sdhci_omap_host *omap_host,
593 unsigned int mode)
594{
595 u32 reg;
596
597 if (omap_host->bus_mode == mode)
598 return;
599
600 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
601 if (mode == MMC_BUSMODE_OPENDRAIN)
602 reg |= CON_OD;
603 else
604 reg &= ~CON_OD;
605 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
606
607 omap_host->bus_mode = mode;
608}
609
610static void sdhci_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
611{
612 struct sdhci_host *host = mmc_priv(mmc);
613 struct sdhci_pltfm_host *pltfm_host;
614 struct sdhci_omap_host *omap_host;
615
616 pltfm_host = sdhci_priv(host);
617 omap_host = sdhci_pltfm_priv(pltfm_host);
618
619 sdhci_omap_set_bus_mode(omap_host, ios->bus_mode);
620 sdhci_omap_set_timing(omap_host, ios->timing);
621 sdhci_set_ios(mmc, ios);
622 sdhci_omap_set_power_mode(omap_host, ios->power_mode);
623}
624
625static u16 sdhci_omap_calc_divisor(struct sdhci_pltfm_host *host,
626 unsigned int clock)
627{
628 u16 dsor;
629
630 dsor = DIV_ROUND_UP(clk_get_rate(host->clk), clock);
631 if (dsor > SYSCTL_CLKD_MAX)
632 dsor = SYSCTL_CLKD_MAX;
633
634 return dsor;
635}
636
637static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host)
638{
639 u32 reg;
640
641 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
642 reg |= SYSCTL_CEN;
643 sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
644}
645
646static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host)
647{
648 u32 reg;
649
650 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
651 reg &= ~SYSCTL_CEN;
652 sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
653}
654
655static void sdhci_omap_set_clock(struct sdhci_host *host, unsigned int clock)
656{
657 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
658 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
659 unsigned long clkdiv;
660
661 sdhci_omap_stop_clock(omap_host);
662
663 if (!clock)
664 return;
665
666 clkdiv = sdhci_omap_calc_divisor(pltfm_host, clock);
667 clkdiv = (clkdiv & SYSCTL_CLKD_MASK) << SYSCTL_CLKD_SHIFT;
668 sdhci_enable_clk(host, clkdiv);
669
670 sdhci_omap_start_clock(omap_host);
671}
672
673static void sdhci_omap_set_power(struct sdhci_host *host, unsigned char mode,
674 unsigned short vdd)
675{
676 struct mmc_host *mmc = host->mmc;
677
678 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
679}
680
681static int sdhci_omap_enable_dma(struct sdhci_host *host)
682{
683 u32 reg;
684 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
685 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
686
687 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
688 reg |= CON_DMA_MASTER;
689 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
690
691 return 0;
692}
693
694static unsigned int sdhci_omap_get_min_clock(struct sdhci_host *host)
695{
696 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
697
698 return clk_get_rate(pltfm_host->clk) / SYSCTL_CLKD_MAX;
699}
700
701static void sdhci_omap_set_bus_width(struct sdhci_host *host, int width)
702{
703 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
704 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
705 u32 reg;
706
707 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
708 if (width == MMC_BUS_WIDTH_8)
709 reg |= CON_DW8;
710 else
711 reg &= ~CON_DW8;
712 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
713
714 sdhci_set_bus_width(host, width);
715}
716
717static void sdhci_omap_init_74_clocks(struct sdhci_host *host, u8 power_mode)
718{
719 u32 reg;
720 ktime_t timeout;
721 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
722 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
723
724 if (omap_host->power_mode == power_mode)
725 return;
726
727 if (power_mode != MMC_POWER_ON)
728 return;
729
730 disable_irq(host->irq);
731
732 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
733 reg |= CON_INIT;
734 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
735 sdhci_omap_writel(omap_host, SDHCI_OMAP_CMD, 0x0);
736
737 /* wait 1ms */
738 timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
739 while (1) {
740 bool timedout = ktime_after(ktime_get(), timeout);
741
742 if (sdhci_omap_readl(omap_host, SDHCI_OMAP_STAT) & INT_CC_EN)
743 break;
744 if (WARN_ON(timedout))
745 return;
746 usleep_range(5, 10);
747 }
748
749 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
750 reg &= ~CON_INIT;
751 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
752 sdhci_omap_writel(omap_host, SDHCI_OMAP_STAT, INT_CC_EN);
753
754 enable_irq(host->irq);
755}
756
757static void sdhci_omap_set_uhs_signaling(struct sdhci_host *host,
758 unsigned int timing)
759{
760 u32 reg;
761 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
762 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
763
764 sdhci_omap_stop_clock(omap_host);
765
766 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
767 if (timing == MMC_TIMING_UHS_DDR50 || timing == MMC_TIMING_MMC_DDR52)
768 reg |= CON_DDR;
769 else
770 reg &= ~CON_DDR;
771 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
772
773 sdhci_set_uhs_signaling(host, timing);
774 sdhci_omap_start_clock(omap_host);
775}
776
777static void sdhci_omap_reset(struct sdhci_host *host, u8 mask)
778{
779 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
780 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
781
782 /* Don't reset data lines during tuning operation */
783 if (omap_host->is_tuning)
784 mask &= ~SDHCI_RESET_DATA;
785
786 sdhci_reset(host, mask);
787}
788
789#define CMD_ERR_MASK (SDHCI_INT_CRC | SDHCI_INT_END_BIT | SDHCI_INT_INDEX |\
790 SDHCI_INT_TIMEOUT)
791#define CMD_MASK (CMD_ERR_MASK | SDHCI_INT_RESPONSE)
792
793static u32 sdhci_omap_irq(struct sdhci_host *host, u32 intmask)
794{
795 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
796 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
797
798 if (omap_host->is_tuning && host->cmd && !host->data_early &&
799 (intmask & CMD_ERR_MASK)) {
800
801 /*
802 * Since we are not resetting data lines during tuning
803 * operation, data error or data complete interrupts
804 * might still arrive. Mark this request as a failure
805 * but still wait for the data interrupt
806 */
807 if (intmask & SDHCI_INT_TIMEOUT)
808 host->cmd->error = -ETIMEDOUT;
809 else
810 host->cmd->error = -EILSEQ;
811
812 host->cmd = NULL;
813
814 /*
815 * Sometimes command error interrupts and command complete
816 * interrupt will arrive together. Clear all command related
817 * interrupts here.
818 */
819 sdhci_writel(host, intmask & CMD_MASK, SDHCI_INT_STATUS);
820 intmask &= ~CMD_MASK;
821 }
822
823 return intmask;
824}
825
826static struct sdhci_ops sdhci_omap_ops = {
827 .set_clock = sdhci_omap_set_clock,
828 .set_power = sdhci_omap_set_power,
829 .enable_dma = sdhci_omap_enable_dma,
830 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
831 .get_min_clock = sdhci_omap_get_min_clock,
832 .set_bus_width = sdhci_omap_set_bus_width,
833 .platform_send_init_74_clocks = sdhci_omap_init_74_clocks,
834 .reset = sdhci_omap_reset,
835 .set_uhs_signaling = sdhci_omap_set_uhs_signaling,
836 .irq = sdhci_omap_irq,
837};
838
839static int sdhci_omap_set_capabilities(struct sdhci_omap_host *omap_host)
840{
841 u32 reg;
842 int ret = 0;
843 struct device *dev = omap_host->dev;
844 struct regulator *vqmmc;
845
846 vqmmc = regulator_get(dev, "vqmmc");
847 if (IS_ERR(vqmmc)) {
848 ret = PTR_ERR(vqmmc);
849 goto reg_put;
850 }
851
852 /* voltage capabilities might be set by boot loader, clear it */
853 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
854 reg &= ~(CAPA_VS18 | CAPA_VS30 | CAPA_VS33);
855
856 if (regulator_is_supported_voltage(vqmmc, IOV_3V3, IOV_3V3))
857 reg |= CAPA_VS33;
858 if (regulator_is_supported_voltage(vqmmc, IOV_1V8, IOV_1V8))
859 reg |= CAPA_VS18;
860
861 sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, reg);
862
863reg_put:
864 regulator_put(vqmmc);
865
866 return ret;
867}
868
869static const struct sdhci_pltfm_data sdhci_omap_pdata = {
870 .quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
871 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
872 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
873 SDHCI_QUIRK_NO_HISPD_BIT |
874 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
875 .quirks2 = SDHCI_QUIRK2_ACMD23_BROKEN |
876 SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
877 SDHCI_QUIRK2_RSP_136_HAS_CRC |
878 SDHCI_QUIRK2_DISABLE_HW_TIMEOUT,
879 .ops = &sdhci_omap_ops,
880};
881
882static const struct sdhci_omap_data k2g_data = {
883 .offset = 0x200,
884};
885
886static const struct sdhci_omap_data dra7_data = {
887 .offset = 0x200,
888 .flags = SDHCI_OMAP_REQUIRE_IODELAY,
889};
890
891static const struct of_device_id omap_sdhci_match[] = {
892 { .compatible = "ti,dra7-sdhci", .data = &dra7_data },
893 { .compatible = "ti,k2g-sdhci", .data = &k2g_data },
894 {},
895};
896MODULE_DEVICE_TABLE(of, omap_sdhci_match);
897
898static struct pinctrl_state
899*sdhci_omap_iodelay_pinctrl_state(struct sdhci_omap_host *omap_host, char *mode,
900 u32 *caps, u32 capmask)
901{
902 struct device *dev = omap_host->dev;
903 char *version = omap_host->version;
904 struct pinctrl_state *pinctrl_state = ERR_PTR(-ENODEV);
905 char str[20];
906
907 if (!(*caps & capmask))
908 goto ret;
909
910 if (version) {
911 snprintf(str, 20, "%s-%s", mode, version);
912 pinctrl_state = pinctrl_lookup_state(omap_host->pinctrl, str);
913 }
914
915 if (IS_ERR(pinctrl_state))
916 pinctrl_state = pinctrl_lookup_state(omap_host->pinctrl, mode);
917
918 if (IS_ERR(pinctrl_state)) {
919 dev_err(dev, "no pinctrl state for %s mode", mode);
920 *caps &= ~capmask;
921 }
922
923ret:
924 return pinctrl_state;
925}
926
927static int sdhci_omap_config_iodelay_pinctrl_state(struct sdhci_omap_host
928 *omap_host)
929{
930 struct device *dev = omap_host->dev;
931 struct sdhci_host *host = omap_host->host;
932 struct mmc_host *mmc = host->mmc;
933 u32 *caps = &mmc->caps;
934 u32 *caps2 = &mmc->caps2;
935 struct pinctrl_state *state;
936 struct pinctrl_state **pinctrl_state;
937
938 if (!(omap_host->flags & SDHCI_OMAP_REQUIRE_IODELAY))
939 return 0;
940
941 pinctrl_state = devm_kcalloc(dev,
942 MMC_TIMING_MMC_HS200 + 1,
943 sizeof(*pinctrl_state),
944 GFP_KERNEL);
945 if (!pinctrl_state)
946 return -ENOMEM;
947
948 omap_host->pinctrl = devm_pinctrl_get(omap_host->dev);
949 if (IS_ERR(omap_host->pinctrl)) {
950 dev_err(dev, "Cannot get pinctrl\n");
951 return PTR_ERR(omap_host->pinctrl);
952 }
953
954 state = pinctrl_lookup_state(omap_host->pinctrl, "default");
955 if (IS_ERR(state)) {
956 dev_err(dev, "no pinctrl state for default mode\n");
957 return PTR_ERR(state);
958 }
959 pinctrl_state[MMC_TIMING_LEGACY] = state;
960
961 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr104", caps,
962 MMC_CAP_UHS_SDR104);
963 if (!IS_ERR(state))
964 pinctrl_state[MMC_TIMING_UHS_SDR104] = state;
965
966 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "ddr50", caps,
967 MMC_CAP_UHS_DDR50);
968 if (!IS_ERR(state))
969 pinctrl_state[MMC_TIMING_UHS_DDR50] = state;
970
971 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr50", caps,
972 MMC_CAP_UHS_SDR50);
973 if (!IS_ERR(state))
974 pinctrl_state[MMC_TIMING_UHS_SDR50] = state;
975
976 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr25", caps,
977 MMC_CAP_UHS_SDR25);
978 if (!IS_ERR(state))
979 pinctrl_state[MMC_TIMING_UHS_SDR25] = state;
980
981 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr12", caps,
982 MMC_CAP_UHS_SDR12);
983 if (!IS_ERR(state))
984 pinctrl_state[MMC_TIMING_UHS_SDR12] = state;
985
986 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "ddr_1_8v", caps,
987 MMC_CAP_1_8V_DDR);
988 if (!IS_ERR(state)) {
989 pinctrl_state[MMC_TIMING_MMC_DDR52] = state;
990 } else {
991 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "ddr_3_3v",
992 caps,
993 MMC_CAP_3_3V_DDR);
994 if (!IS_ERR(state))
995 pinctrl_state[MMC_TIMING_MMC_DDR52] = state;
996 }
997
998 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "hs", caps,
999 MMC_CAP_SD_HIGHSPEED);
1000 if (!IS_ERR(state))
1001 pinctrl_state[MMC_TIMING_SD_HS] = state;
1002
1003 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "hs", caps,
1004 MMC_CAP_MMC_HIGHSPEED);
1005 if (!IS_ERR(state))
1006 pinctrl_state[MMC_TIMING_MMC_HS] = state;
1007
1008 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "hs200_1_8v", caps2,
1009 MMC_CAP2_HS200_1_8V_SDR);
1010 if (!IS_ERR(state))
1011 pinctrl_state[MMC_TIMING_MMC_HS200] = state;
1012
1013 omap_host->pinctrl_state = pinctrl_state;
1014
1015 return 0;
1016}
1017
1018static const struct soc_device_attribute sdhci_omap_soc_devices[] = {
1019 {
1020 .machine = "DRA7[45]*",
1021 .revision = "ES1.[01]",
1022 },
1023 {
1024 /* sentinel */
1025 }
1026};
1027
1028static int sdhci_omap_probe(struct platform_device *pdev)
1029{
1030 int ret;
1031 u32 offset;
1032 struct device *dev = &pdev->dev;
1033 struct sdhci_host *host;
1034 struct sdhci_pltfm_host *pltfm_host;
1035 struct sdhci_omap_host *omap_host;
1036 struct mmc_host *mmc;
1037 const struct of_device_id *match;
1038 struct sdhci_omap_data *data;
1039 const struct soc_device_attribute *soc;
1040
1041 match = of_match_device(omap_sdhci_match, dev);
1042 if (!match)
1043 return -EINVAL;
1044
1045 data = (struct sdhci_omap_data *)match->data;
1046 if (!data) {
1047 dev_err(dev, "no sdhci omap data\n");
1048 return -EINVAL;
1049 }
1050 offset = data->offset;
1051
1052 host = sdhci_pltfm_init(pdev, &sdhci_omap_pdata,
1053 sizeof(*omap_host));
1054 if (IS_ERR(host)) {
1055 dev_err(dev, "Failed sdhci_pltfm_init\n");
1056 return PTR_ERR(host);
1057 }
1058
1059 pltfm_host = sdhci_priv(host);
1060 omap_host = sdhci_pltfm_priv(pltfm_host);
1061 omap_host->host = host;
1062 omap_host->base = host->ioaddr;
1063 omap_host->dev = dev;
1064 omap_host->power_mode = MMC_POWER_UNDEFINED;
1065 omap_host->timing = MMC_TIMING_LEGACY;
1066 omap_host->flags = data->flags;
1067 host->ioaddr += offset;
1068
1069 mmc = host->mmc;
1070 sdhci_get_of_property(pdev);
1071 ret = mmc_of_parse(mmc);
1072 if (ret)
1073 goto err_pltfm_free;
1074
1075 soc = soc_device_match(sdhci_omap_soc_devices);
1076 if (soc) {
1077 omap_host->version = "rev11";
1078 if (!strcmp(dev_name(dev), "4809c000.mmc"))
1079 mmc->f_max = 96000000;
1080 if (!strcmp(dev_name(dev), "480b4000.mmc"))
1081 mmc->f_max = 48000000;
1082 if (!strcmp(dev_name(dev), "480ad000.mmc"))
1083 mmc->f_max = 48000000;
1084 }
1085
1086 if (!mmc_can_gpio_ro(mmc))
1087 mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
1088
1089 pltfm_host->clk = devm_clk_get(dev, "fck");
1090 if (IS_ERR(pltfm_host->clk)) {
1091 ret = PTR_ERR(pltfm_host->clk);
1092 goto err_pltfm_free;
1093 }
1094
1095 ret = clk_set_rate(pltfm_host->clk, mmc->f_max);
1096 if (ret) {
1097 dev_err(dev, "failed to set clock to %d\n", mmc->f_max);
1098 goto err_pltfm_free;
1099 }
1100
1101 omap_host->pbias = devm_regulator_get_optional(dev, "pbias");
1102 if (IS_ERR(omap_host->pbias)) {
1103 ret = PTR_ERR(omap_host->pbias);
1104 if (ret != -ENODEV)
1105 goto err_pltfm_free;
1106 dev_dbg(dev, "unable to get pbias regulator %d\n", ret);
1107 }
1108 omap_host->pbias_enabled = false;
1109
1110 /*
1111 * omap_device_pm_domain has callbacks to enable the main
1112 * functional clock, interface clock and also configure the
1113 * SYSCONFIG register of omap devices. The callback will be invoked
1114 * as part of pm_runtime_get_sync.
1115 */
1116 pm_runtime_enable(dev);
1117 ret = pm_runtime_get_sync(dev);
1118 if (ret < 0) {
1119 dev_err(dev, "pm_runtime_get_sync failed\n");
1120 pm_runtime_put_noidle(dev);
1121 goto err_rpm_disable;
1122 }
1123
1124 ret = sdhci_omap_set_capabilities(omap_host);
1125 if (ret) {
1126 dev_err(dev, "failed to set system capabilities\n");
1127 goto err_put_sync;
1128 }
1129
1130 host->mmc_host_ops.start_signal_voltage_switch =
1131 sdhci_omap_start_signal_voltage_switch;
1132 host->mmc_host_ops.set_ios = sdhci_omap_set_ios;
1133 host->mmc_host_ops.card_busy = sdhci_omap_card_busy;
1134 host->mmc_host_ops.execute_tuning = sdhci_omap_execute_tuning;
1135 host->mmc_host_ops.enable_sdio_irq = sdhci_omap_enable_sdio_irq;
1136
1137 ret = sdhci_setup_host(host);
1138 if (ret)
1139 goto err_put_sync;
1140
1141 ret = sdhci_omap_config_iodelay_pinctrl_state(omap_host);
1142 if (ret)
1143 goto err_cleanup_host;
1144
1145 ret = __sdhci_add_host(host);
1146 if (ret)
1147 goto err_cleanup_host;
1148
1149 return 0;
1150
1151err_cleanup_host:
1152 sdhci_cleanup_host(host);
1153
1154err_put_sync:
1155 pm_runtime_put_sync(dev);
1156
1157err_rpm_disable:
1158 pm_runtime_disable(dev);
1159
1160err_pltfm_free:
1161 sdhci_pltfm_free(pdev);
1162 return ret;
1163}
1164
1165static int sdhci_omap_remove(struct platform_device *pdev)
1166{
1167 struct device *dev = &pdev->dev;
1168 struct sdhci_host *host = platform_get_drvdata(pdev);
1169
1170 sdhci_remove_host(host, true);
1171 pm_runtime_put_sync(dev);
1172 pm_runtime_disable(dev);
1173 sdhci_pltfm_free(pdev);
1174
1175 return 0;
1176}
1177
1178static struct platform_driver sdhci_omap_driver = {
1179 .probe = sdhci_omap_probe,
1180 .remove = sdhci_omap_remove,
1181 .driver = {
1182 .name = "sdhci-omap",
1183 .of_match_table = omap_sdhci_match,
1184 },
1185};
1186
1187module_platform_driver(sdhci_omap_driver);
1188
1189MODULE_DESCRIPTION("SDHCI driver for OMAP SoCs");
1190MODULE_AUTHOR("Texas Instruments Inc.");
1191MODULE_LICENSE("GPL v2");
1192MODULE_ALIAS("platform:sdhci_omap");