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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
30#include "sdhci-pltfm.h"
31
32#define SDHCI_OMAP_CON 0x12c
33#define CON_DW8 BIT(5)
34#define CON_DMA_MASTER BIT(20)
35#define CON_DDR BIT(19)
36#define CON_CLKEXTFREE BIT(16)
37#define CON_PADEN BIT(15)
38#define CON_INIT BIT(1)
39#define CON_OD BIT(0)
40
41#define SDHCI_OMAP_DLL 0x0134
42#define DLL_SWT BIT(20)
43#define DLL_FORCE_SR_C_SHIFT 13
44#define DLL_FORCE_SR_C_MASK (0x7f << DLL_FORCE_SR_C_SHIFT)
45#define DLL_FORCE_VALUE BIT(12)
46#define DLL_CALIB BIT(1)
47
48#define SDHCI_OMAP_CMD 0x20c
49
50#define SDHCI_OMAP_PSTATE 0x0224
51#define PSTATE_DLEV_DAT0 BIT(20)
52#define PSTATE_DATI BIT(1)
53
54#define SDHCI_OMAP_HCTL 0x228
55#define HCTL_SDBP BIT(8)
56#define HCTL_SDVS_SHIFT 9
57#define HCTL_SDVS_MASK (0x7 << HCTL_SDVS_SHIFT)
58#define HCTL_SDVS_33 (0x7 << HCTL_SDVS_SHIFT)
59#define HCTL_SDVS_30 (0x6 << HCTL_SDVS_SHIFT)
60#define HCTL_SDVS_18 (0x5 << HCTL_SDVS_SHIFT)
61
62#define SDHCI_OMAP_SYSCTL 0x22c
63#define SYSCTL_CEN BIT(2)
64#define SYSCTL_CLKD_SHIFT 6
65#define SYSCTL_CLKD_MASK 0x3ff
66
67#define SDHCI_OMAP_STAT 0x230
68
69#define SDHCI_OMAP_IE 0x234
70#define INT_CC_EN BIT(0)
71
72#define SDHCI_OMAP_AC12 0x23c
73#define AC12_V1V8_SIGEN BIT(19)
74#define AC12_SCLK_SEL BIT(23)
75
76#define SDHCI_OMAP_CAPA 0x240
77#define CAPA_VS33 BIT(24)
78#define CAPA_VS30 BIT(25)
79#define CAPA_VS18 BIT(26)
80
81#define SDHCI_OMAP_CAPA2 0x0244
82#define CAPA2_TSDR50 BIT(13)
83
84#define SDHCI_OMAP_TIMEOUT 1 /* 1 msec */
85
86#define SYSCTL_CLKD_MAX 0x3FF
87
88#define IOV_1V8 1800000 /* 180000 uV */
89#define IOV_3V0 3000000 /* 300000 uV */
90#define IOV_3V3 3300000 /* 330000 uV */
91
92#define MAX_PHASE_DELAY 0x7C
93
94/* sdhci-omap controller flags */
95#define SDHCI_OMAP_REQUIRE_IODELAY BIT(0)
96
97struct sdhci_omap_data {
98 u32 offset;
99 u8 flags;
100};
101
102struct sdhci_omap_host {
103 void __iomem *base;
104 struct device *dev;
105 struct regulator *pbias;
106 bool pbias_enabled;
107 struct sdhci_host *host;
108 u8 bus_mode;
109 u8 power_mode;
110 u8 timing;
111 u8 flags;
112
113 struct pinctrl *pinctrl;
114 struct pinctrl_state **pinctrl_state;
115};
116
117static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host);
118static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host);
119
120static inline u32 sdhci_omap_readl(struct sdhci_omap_host *host,
121 unsigned int offset)
122{
123 return readl(host->base + offset);
124}
125
126static inline void sdhci_omap_writel(struct sdhci_omap_host *host,
127 unsigned int offset, u32 data)
128{
129 writel(data, host->base + offset);
130}
131
132static int sdhci_omap_set_pbias(struct sdhci_omap_host *omap_host,
133 bool power_on, unsigned int iov)
134{
135 int ret;
136 struct device *dev = omap_host->dev;
137
138 if (IS_ERR(omap_host->pbias))
139 return 0;
140
141 if (power_on) {
142 ret = regulator_set_voltage(omap_host->pbias, iov, iov);
143 if (ret) {
144 dev_err(dev, "pbias set voltage failed\n");
145 return ret;
146 }
147
148 if (omap_host->pbias_enabled)
149 return 0;
150
151 ret = regulator_enable(omap_host->pbias);
152 if (ret) {
153 dev_err(dev, "pbias reg enable fail\n");
154 return ret;
155 }
156
157 omap_host->pbias_enabled = true;
158 } else {
159 if (!omap_host->pbias_enabled)
160 return 0;
161
162 ret = regulator_disable(omap_host->pbias);
163 if (ret) {
164 dev_err(dev, "pbias reg disable fail\n");
165 return ret;
166 }
167 omap_host->pbias_enabled = false;
168 }
169
170 return 0;
171}
172
173static int sdhci_omap_enable_iov(struct sdhci_omap_host *omap_host,
174 unsigned int iov)
175{
176 int ret;
177 struct sdhci_host *host = omap_host->host;
178 struct mmc_host *mmc = host->mmc;
179
180 ret = sdhci_omap_set_pbias(omap_host, false, 0);
181 if (ret)
182 return ret;
183
184 if (!IS_ERR(mmc->supply.vqmmc)) {
185 ret = regulator_set_voltage(mmc->supply.vqmmc, iov, iov);
186 if (ret) {
187 dev_err(mmc_dev(mmc), "vqmmc set voltage failed\n");
188 return ret;
189 }
190 }
191
192 ret = sdhci_omap_set_pbias(omap_host, true, iov);
193 if (ret)
194 return ret;
195
196 return 0;
197}
198
199static void sdhci_omap_conf_bus_power(struct sdhci_omap_host *omap_host,
200 unsigned char signal_voltage)
201{
202 u32 reg;
203 ktime_t timeout;
204
205 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL);
206 reg &= ~HCTL_SDVS_MASK;
207
208 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
209 reg |= HCTL_SDVS_33;
210 else
211 reg |= HCTL_SDVS_18;
212
213 sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);
214
215 reg |= HCTL_SDBP;
216 sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);
217
218 /* wait 1ms */
219 timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
220 while (!(sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL) & HCTL_SDBP)) {
221 if (WARN_ON(ktime_after(ktime_get(), timeout)))
222 return;
223 usleep_range(5, 10);
224 }
225}
226
227static inline void sdhci_omap_set_dll(struct sdhci_omap_host *omap_host,
228 int count)
229{
230 int i;
231 u32 reg;
232
233 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
234 reg |= DLL_FORCE_VALUE;
235 reg &= ~DLL_FORCE_SR_C_MASK;
236 reg |= (count << DLL_FORCE_SR_C_SHIFT);
237 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
238
239 reg |= DLL_CALIB;
240 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
241 for (i = 0; i < 1000; i++) {
242 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
243 if (reg & DLL_CALIB)
244 break;
245 }
246 reg &= ~DLL_CALIB;
247 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
248}
249
250static void sdhci_omap_disable_tuning(struct sdhci_omap_host *omap_host)
251{
252 u32 reg;
253
254 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
255 reg &= ~AC12_SCLK_SEL;
256 sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
257
258 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
259 reg &= ~(DLL_FORCE_VALUE | DLL_SWT);
260 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
261}
262
263static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode)
264{
265 struct sdhci_host *host = mmc_priv(mmc);
266 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
267 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
268 struct device *dev = omap_host->dev;
269 struct mmc_ios *ios = &mmc->ios;
270 u32 start_window = 0, max_window = 0;
271 u8 cur_match, prev_match = 0;
272 u32 length = 0, max_len = 0;
273 u32 ier = host->ier;
274 u32 phase_delay = 0;
275 int ret = 0;
276 u32 reg;
277
278 pltfm_host = sdhci_priv(host);
279 omap_host = sdhci_pltfm_priv(pltfm_host);
280 dev = omap_host->dev;
281
282 /* clock tuning is not needed for upto 52MHz */
283 if (ios->clock <= 52000000)
284 return 0;
285
286 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA2);
287 if (ios->timing == MMC_TIMING_UHS_SDR50 && !(reg & CAPA2_TSDR50))
288 return 0;
289
290 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
291 reg |= DLL_SWT;
292 sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
293
294 /*
295 * OMAP5/DRA74X/DRA72x Errata i802:
296 * DCRC error interrupts (MMCHS_STAT[21] DCRC=0x1) can occur
297 * during the tuning procedure. So disable it during the
298 * tuning procedure.
299 */
300 ier &= ~SDHCI_INT_DATA_CRC;
301 sdhci_writel(host, ier, SDHCI_INT_ENABLE);
302 sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);
303
304 while (phase_delay <= MAX_PHASE_DELAY) {
305 sdhci_omap_set_dll(omap_host, phase_delay);
306
307 cur_match = !mmc_send_tuning(mmc, opcode, NULL);
308 if (cur_match) {
309 if (prev_match) {
310 length++;
311 } else {
312 start_window = phase_delay;
313 length = 1;
314 }
315 }
316
317 if (length > max_len) {
318 max_window = start_window;
319 max_len = length;
320 }
321
322 prev_match = cur_match;
323 phase_delay += 4;
324 }
325
326 if (!max_len) {
327 dev_err(dev, "Unable to find match\n");
328 ret = -EIO;
329 goto tuning_error;
330 }
331
332 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
333 if (!(reg & AC12_SCLK_SEL)) {
334 ret = -EIO;
335 goto tuning_error;
336 }
337
338 phase_delay = max_window + 4 * (max_len >> 1);
339 sdhci_omap_set_dll(omap_host, phase_delay);
340
341 goto ret;
342
343tuning_error:
344 dev_err(dev, "Tuning failed\n");
345 sdhci_omap_disable_tuning(omap_host);
346
347ret:
348 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
349 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
350 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
351 return ret;
352}
353
354static int sdhci_omap_card_busy(struct mmc_host *mmc)
355{
356 u32 reg, ac12;
357 int ret = false;
358 struct sdhci_host *host = mmc_priv(mmc);
359 struct sdhci_pltfm_host *pltfm_host;
360 struct sdhci_omap_host *omap_host;
361 u32 ier = host->ier;
362
363 pltfm_host = sdhci_priv(host);
364 omap_host = sdhci_pltfm_priv(pltfm_host);
365
366 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
367 ac12 = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
368 reg &= ~CON_CLKEXTFREE;
369 if (ac12 & AC12_V1V8_SIGEN)
370 reg |= CON_CLKEXTFREE;
371 reg |= CON_PADEN;
372 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
373
374 disable_irq(host->irq);
375 ier |= SDHCI_INT_CARD_INT;
376 sdhci_writel(host, ier, SDHCI_INT_ENABLE);
377 sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);
378
379 /*
380 * Delay is required for PSTATE to correctly reflect
381 * DLEV/CLEV values after PADEN is set.
382 */
383 usleep_range(50, 100);
384 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_PSTATE);
385 if ((reg & PSTATE_DATI) || !(reg & PSTATE_DLEV_DAT0))
386 ret = true;
387
388 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
389 reg &= ~(CON_CLKEXTFREE | CON_PADEN);
390 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
391
392 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
393 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
394 enable_irq(host->irq);
395
396 return ret;
397}
398
399static int sdhci_omap_start_signal_voltage_switch(struct mmc_host *mmc,
400 struct mmc_ios *ios)
401{
402 u32 reg;
403 int ret;
404 unsigned int iov;
405 struct sdhci_host *host = mmc_priv(mmc);
406 struct sdhci_pltfm_host *pltfm_host;
407 struct sdhci_omap_host *omap_host;
408 struct device *dev;
409
410 pltfm_host = sdhci_priv(host);
411 omap_host = sdhci_pltfm_priv(pltfm_host);
412 dev = omap_host->dev;
413
414 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
415 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
416 if (!(reg & CAPA_VS33))
417 return -EOPNOTSUPP;
418
419 sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);
420
421 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
422 reg &= ~AC12_V1V8_SIGEN;
423 sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
424
425 iov = IOV_3V3;
426 } else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
427 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
428 if (!(reg & CAPA_VS18))
429 return -EOPNOTSUPP;
430
431 sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);
432
433 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
434 reg |= AC12_V1V8_SIGEN;
435 sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
436
437 iov = IOV_1V8;
438 } else {
439 return -EOPNOTSUPP;
440 }
441
442 ret = sdhci_omap_enable_iov(omap_host, iov);
443 if (ret) {
444 dev_err(dev, "failed to switch IO voltage to %dmV\n", iov);
445 return ret;
446 }
447
448 dev_dbg(dev, "IO voltage switched to %dmV\n", iov);
449 return 0;
450}
451
452static void sdhci_omap_set_timing(struct sdhci_omap_host *omap_host, u8 timing)
453{
454 int ret;
455 struct pinctrl_state *pinctrl_state;
456 struct device *dev = omap_host->dev;
457
458 if (!(omap_host->flags & SDHCI_OMAP_REQUIRE_IODELAY))
459 return;
460
461 if (omap_host->timing == timing)
462 return;
463
464 sdhci_omap_stop_clock(omap_host);
465
466 pinctrl_state = omap_host->pinctrl_state[timing];
467 ret = pinctrl_select_state(omap_host->pinctrl, pinctrl_state);
468 if (ret) {
469 dev_err(dev, "failed to select pinctrl state\n");
470 return;
471 }
472
473 sdhci_omap_start_clock(omap_host);
474 omap_host->timing = timing;
475}
476
477static void sdhci_omap_set_power_mode(struct sdhci_omap_host *omap_host,
478 u8 power_mode)
479{
480 if (omap_host->bus_mode == MMC_POWER_OFF)
481 sdhci_omap_disable_tuning(omap_host);
482 omap_host->power_mode = power_mode;
483}
484
485static void sdhci_omap_set_bus_mode(struct sdhci_omap_host *omap_host,
486 unsigned int mode)
487{
488 u32 reg;
489
490 if (omap_host->bus_mode == mode)
491 return;
492
493 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
494 if (mode == MMC_BUSMODE_OPENDRAIN)
495 reg |= CON_OD;
496 else
497 reg &= ~CON_OD;
498 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
499
500 omap_host->bus_mode = mode;
501}
502
503static void sdhci_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
504{
505 struct sdhci_host *host = mmc_priv(mmc);
506 struct sdhci_pltfm_host *pltfm_host;
507 struct sdhci_omap_host *omap_host;
508
509 pltfm_host = sdhci_priv(host);
510 omap_host = sdhci_pltfm_priv(pltfm_host);
511
512 sdhci_omap_set_bus_mode(omap_host, ios->bus_mode);
513 sdhci_omap_set_timing(omap_host, ios->timing);
514 sdhci_set_ios(mmc, ios);
515 sdhci_omap_set_power_mode(omap_host, ios->power_mode);
516}
517
518static u16 sdhci_omap_calc_divisor(struct sdhci_pltfm_host *host,
519 unsigned int clock)
520{
521 u16 dsor;
522
523 dsor = DIV_ROUND_UP(clk_get_rate(host->clk), clock);
524 if (dsor > SYSCTL_CLKD_MAX)
525 dsor = SYSCTL_CLKD_MAX;
526
527 return dsor;
528}
529
530static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host)
531{
532 u32 reg;
533
534 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
535 reg |= SYSCTL_CEN;
536 sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
537}
538
539static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host)
540{
541 u32 reg;
542
543 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
544 reg &= ~SYSCTL_CEN;
545 sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
546}
547
548static void sdhci_omap_set_clock(struct sdhci_host *host, unsigned int clock)
549{
550 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
551 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
552 unsigned long clkdiv;
553
554 sdhci_omap_stop_clock(omap_host);
555
556 if (!clock)
557 return;
558
559 clkdiv = sdhci_omap_calc_divisor(pltfm_host, clock);
560 clkdiv = (clkdiv & SYSCTL_CLKD_MASK) << SYSCTL_CLKD_SHIFT;
561 sdhci_enable_clk(host, clkdiv);
562
563 sdhci_omap_start_clock(omap_host);
564}
565
566static void sdhci_omap_set_power(struct sdhci_host *host, unsigned char mode,
567 unsigned short vdd)
568{
569 struct mmc_host *mmc = host->mmc;
570
571 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
572}
573
574static int sdhci_omap_enable_dma(struct sdhci_host *host)
575{
576 u32 reg;
577 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
578 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
579
580 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
581 reg |= CON_DMA_MASTER;
582 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
583
584 return 0;
585}
586
587static unsigned int sdhci_omap_get_min_clock(struct sdhci_host *host)
588{
589 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
590
591 return clk_get_rate(pltfm_host->clk) / SYSCTL_CLKD_MAX;
592}
593
594static void sdhci_omap_set_bus_width(struct sdhci_host *host, int width)
595{
596 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
597 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
598 u32 reg;
599
600 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
601 if (width == MMC_BUS_WIDTH_8)
602 reg |= CON_DW8;
603 else
604 reg &= ~CON_DW8;
605 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
606
607 sdhci_set_bus_width(host, width);
608}
609
610static void sdhci_omap_init_74_clocks(struct sdhci_host *host, u8 power_mode)
611{
612 u32 reg;
613 ktime_t timeout;
614 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
615 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
616
617 if (omap_host->power_mode == power_mode)
618 return;
619
620 if (power_mode != MMC_POWER_ON)
621 return;
622
623 disable_irq(host->irq);
624
625 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
626 reg |= CON_INIT;
627 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
628 sdhci_omap_writel(omap_host, SDHCI_OMAP_CMD, 0x0);
629
630 /* wait 1ms */
631 timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
632 while (!(sdhci_omap_readl(omap_host, SDHCI_OMAP_STAT) & INT_CC_EN)) {
633 if (WARN_ON(ktime_after(ktime_get(), timeout)))
634 return;
635 usleep_range(5, 10);
636 }
637
638 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
639 reg &= ~CON_INIT;
640 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
641 sdhci_omap_writel(omap_host, SDHCI_OMAP_STAT, INT_CC_EN);
642
643 enable_irq(host->irq);
644}
645
646static void sdhci_omap_set_uhs_signaling(struct sdhci_host *host,
647 unsigned int timing)
648{
649 u32 reg;
650 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
651 struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
652
653 sdhci_omap_stop_clock(omap_host);
654
655 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
656 if (timing == MMC_TIMING_UHS_DDR50 || timing == MMC_TIMING_MMC_DDR52)
657 reg |= CON_DDR;
658 else
659 reg &= ~CON_DDR;
660 sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
661
662 sdhci_set_uhs_signaling(host, timing);
663 sdhci_omap_start_clock(omap_host);
664}
665
666static struct sdhci_ops sdhci_omap_ops = {
667 .set_clock = sdhci_omap_set_clock,
668 .set_power = sdhci_omap_set_power,
669 .enable_dma = sdhci_omap_enable_dma,
670 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
671 .get_min_clock = sdhci_omap_get_min_clock,
672 .set_bus_width = sdhci_omap_set_bus_width,
673 .platform_send_init_74_clocks = sdhci_omap_init_74_clocks,
674 .reset = sdhci_reset,
675 .set_uhs_signaling = sdhci_omap_set_uhs_signaling,
676};
677
678static int sdhci_omap_set_capabilities(struct sdhci_omap_host *omap_host)
679{
680 u32 reg;
681 int ret = 0;
682 struct device *dev = omap_host->dev;
683 struct regulator *vqmmc;
684
685 vqmmc = regulator_get(dev, "vqmmc");
686 if (IS_ERR(vqmmc)) {
687 ret = PTR_ERR(vqmmc);
688 goto reg_put;
689 }
690
691 /* voltage capabilities might be set by boot loader, clear it */
692 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
693 reg &= ~(CAPA_VS18 | CAPA_VS30 | CAPA_VS33);
694
695 if (regulator_is_supported_voltage(vqmmc, IOV_3V3, IOV_3V3))
696 reg |= CAPA_VS33;
697 if (regulator_is_supported_voltage(vqmmc, IOV_1V8, IOV_1V8))
698 reg |= CAPA_VS18;
699
700 sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, reg);
701
702reg_put:
703 regulator_put(vqmmc);
704
705 return ret;
706}
707
708static const struct sdhci_pltfm_data sdhci_omap_pdata = {
709 .quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
710 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
711 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
712 SDHCI_QUIRK_NO_HISPD_BIT |
713 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
714 .quirks2 = SDHCI_QUIRK2_ACMD23_BROKEN |
715 SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
716 SDHCI_QUIRK2_RSP_136_HAS_CRC,
717 .ops = &sdhci_omap_ops,
718};
719
720static const struct sdhci_omap_data dra7_data = {
721 .offset = 0x200,
722 .flags = SDHCI_OMAP_REQUIRE_IODELAY,
723};
724
725static const struct of_device_id omap_sdhci_match[] = {
726 { .compatible = "ti,dra7-sdhci", .data = &dra7_data },
727 {},
728};
729MODULE_DEVICE_TABLE(of, omap_sdhci_match);
730
731static struct pinctrl_state
732*sdhci_omap_iodelay_pinctrl_state(struct sdhci_omap_host *omap_host, char *mode,
733 u32 *caps, u32 capmask)
734{
735 struct device *dev = omap_host->dev;
736 struct pinctrl_state *pinctrl_state = ERR_PTR(-ENODEV);
737
738 if (!(*caps & capmask))
739 goto ret;
740
741 pinctrl_state = pinctrl_lookup_state(omap_host->pinctrl, mode);
742 if (IS_ERR(pinctrl_state)) {
743 dev_err(dev, "no pinctrl state for %s mode", mode);
744 *caps &= ~capmask;
745 }
746
747ret:
748 return pinctrl_state;
749}
750
751static int sdhci_omap_config_iodelay_pinctrl_state(struct sdhci_omap_host
752 *omap_host)
753{
754 struct device *dev = omap_host->dev;
755 struct sdhci_host *host = omap_host->host;
756 struct mmc_host *mmc = host->mmc;
757 u32 *caps = &mmc->caps;
758 u32 *caps2 = &mmc->caps2;
759 struct pinctrl_state *state;
760 struct pinctrl_state **pinctrl_state;
761
762 if (!(omap_host->flags & SDHCI_OMAP_REQUIRE_IODELAY))
763 return 0;
764
765 pinctrl_state = devm_kzalloc(dev, sizeof(*pinctrl_state) *
766 (MMC_TIMING_MMC_HS200 + 1), GFP_KERNEL);
767 if (!pinctrl_state)
768 return -ENOMEM;
769
770 omap_host->pinctrl = devm_pinctrl_get(omap_host->dev);
771 if (IS_ERR(omap_host->pinctrl)) {
772 dev_err(dev, "Cannot get pinctrl\n");
773 return PTR_ERR(omap_host->pinctrl);
774 }
775
776 state = pinctrl_lookup_state(omap_host->pinctrl, "default");
777 if (IS_ERR(state)) {
778 dev_err(dev, "no pinctrl state for default mode\n");
779 return PTR_ERR(state);
780 }
781 pinctrl_state[MMC_TIMING_LEGACY] = state;
782
783 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr104", caps,
784 MMC_CAP_UHS_SDR104);
785 if (!IS_ERR(state))
786 pinctrl_state[MMC_TIMING_UHS_SDR104] = state;
787
788 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "ddr50", caps,
789 MMC_CAP_UHS_DDR50);
790 if (!IS_ERR(state))
791 pinctrl_state[MMC_TIMING_UHS_DDR50] = state;
792
793 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr50", caps,
794 MMC_CAP_UHS_SDR50);
795 if (!IS_ERR(state))
796 pinctrl_state[MMC_TIMING_UHS_SDR50] = state;
797
798 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr25", caps,
799 MMC_CAP_UHS_SDR25);
800 if (!IS_ERR(state))
801 pinctrl_state[MMC_TIMING_UHS_SDR25] = state;
802
803 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr12", caps,
804 MMC_CAP_UHS_SDR12);
805 if (!IS_ERR(state))
806 pinctrl_state[MMC_TIMING_UHS_SDR12] = state;
807
808 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "ddr_1_8v", caps,
809 MMC_CAP_1_8V_DDR);
810 if (!IS_ERR(state))
811 pinctrl_state[MMC_TIMING_MMC_DDR52] = state;
812
813 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "hs", caps,
814 MMC_CAP_SD_HIGHSPEED);
815 if (!IS_ERR(state))
816 pinctrl_state[MMC_TIMING_SD_HS] = state;
817
818 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "hs", caps,
819 MMC_CAP_MMC_HIGHSPEED);
820 if (!IS_ERR(state))
821 pinctrl_state[MMC_TIMING_MMC_HS] = state;
822
823 state = sdhci_omap_iodelay_pinctrl_state(omap_host, "hs200_1_8v", caps2,
824 MMC_CAP2_HS200_1_8V_SDR);
825 if (!IS_ERR(state))
826 pinctrl_state[MMC_TIMING_MMC_HS200] = state;
827
828 omap_host->pinctrl_state = pinctrl_state;
829
830 return 0;
831}
832
833static int sdhci_omap_probe(struct platform_device *pdev)
834{
835 int ret;
836 u32 offset;
837 struct device *dev = &pdev->dev;
838 struct sdhci_host *host;
839 struct sdhci_pltfm_host *pltfm_host;
840 struct sdhci_omap_host *omap_host;
841 struct mmc_host *mmc;
842 const struct of_device_id *match;
843 struct sdhci_omap_data *data;
844
845 match = of_match_device(omap_sdhci_match, dev);
846 if (!match)
847 return -EINVAL;
848
849 data = (struct sdhci_omap_data *)match->data;
850 if (!data) {
851 dev_err(dev, "no sdhci omap data\n");
852 return -EINVAL;
853 }
854 offset = data->offset;
855
856 host = sdhci_pltfm_init(pdev, &sdhci_omap_pdata,
857 sizeof(*omap_host));
858 if (IS_ERR(host)) {
859 dev_err(dev, "Failed sdhci_pltfm_init\n");
860 return PTR_ERR(host);
861 }
862
863 pltfm_host = sdhci_priv(host);
864 omap_host = sdhci_pltfm_priv(pltfm_host);
865 omap_host->host = host;
866 omap_host->base = host->ioaddr;
867 omap_host->dev = dev;
868 omap_host->power_mode = MMC_POWER_UNDEFINED;
869 omap_host->timing = MMC_TIMING_LEGACY;
870 omap_host->flags = data->flags;
871 host->ioaddr += offset;
872
873 mmc = host->mmc;
874 ret = mmc_of_parse(mmc);
875 if (ret)
876 goto err_pltfm_free;
877
878 pltfm_host->clk = devm_clk_get(dev, "fck");
879 if (IS_ERR(pltfm_host->clk)) {
880 ret = PTR_ERR(pltfm_host->clk);
881 goto err_pltfm_free;
882 }
883
884 ret = clk_set_rate(pltfm_host->clk, mmc->f_max);
885 if (ret) {
886 dev_err(dev, "failed to set clock to %d\n", mmc->f_max);
887 goto err_pltfm_free;
888 }
889
890 omap_host->pbias = devm_regulator_get_optional(dev, "pbias");
891 if (IS_ERR(omap_host->pbias)) {
892 ret = PTR_ERR(omap_host->pbias);
893 if (ret != -ENODEV)
894 goto err_pltfm_free;
895 dev_dbg(dev, "unable to get pbias regulator %d\n", ret);
896 }
897 omap_host->pbias_enabled = false;
898
899 /*
900 * omap_device_pm_domain has callbacks to enable the main
901 * functional clock, interface clock and also configure the
902 * SYSCONFIG register of omap devices. The callback will be invoked
903 * as part of pm_runtime_get_sync.
904 */
905 pm_runtime_enable(dev);
906 ret = pm_runtime_get_sync(dev);
907 if (ret < 0) {
908 dev_err(dev, "pm_runtime_get_sync failed\n");
909 pm_runtime_put_noidle(dev);
910 goto err_rpm_disable;
911 }
912
913 ret = sdhci_omap_set_capabilities(omap_host);
914 if (ret) {
915 dev_err(dev, "failed to set system capabilities\n");
916 goto err_put_sync;
917 }
918
919 ret = sdhci_omap_config_iodelay_pinctrl_state(omap_host);
920 if (ret)
921 goto err_put_sync;
922
923 host->mmc_host_ops.get_ro = mmc_gpio_get_ro;
924 host->mmc_host_ops.start_signal_voltage_switch =
925 sdhci_omap_start_signal_voltage_switch;
926 host->mmc_host_ops.set_ios = sdhci_omap_set_ios;
927 host->mmc_host_ops.card_busy = sdhci_omap_card_busy;
928 host->mmc_host_ops.execute_tuning = sdhci_omap_execute_tuning;
929
930 sdhci_read_caps(host);
931 host->caps |= SDHCI_CAN_DO_ADMA2;
932
933 ret = sdhci_add_host(host);
934 if (ret)
935 goto err_put_sync;
936
937 return 0;
938
939err_put_sync:
940 pm_runtime_put_sync(dev);
941
942err_rpm_disable:
943 pm_runtime_disable(dev);
944
945err_pltfm_free:
946 sdhci_pltfm_free(pdev);
947 return ret;
948}
949
950static int sdhci_omap_remove(struct platform_device *pdev)
951{
952 struct device *dev = &pdev->dev;
953 struct sdhci_host *host = platform_get_drvdata(pdev);
954
955 sdhci_remove_host(host, true);
956 pm_runtime_put_sync(dev);
957 pm_runtime_disable(dev);
958 sdhci_pltfm_free(pdev);
959
960 return 0;
961}
962
963static struct platform_driver sdhci_omap_driver = {
964 .probe = sdhci_omap_probe,
965 .remove = sdhci_omap_remove,
966 .driver = {
967 .name = "sdhci-omap",
968 .of_match_table = omap_sdhci_match,
969 },
970};
971
972module_platform_driver(sdhci_omap_driver);
973
974MODULE_DESCRIPTION("SDHCI driver for OMAP SoCs");
975MODULE_AUTHOR("Texas Instruments Inc.");
976MODULE_LICENSE("GPL v2");
977MODULE_ALIAS("platform:sdhci_omap");