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