1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Secure Digital Host Controller
4 //
5 // Copyright (C) 2018 Spreadtrum, Inc.
6 // Author: Chunyan Zhang <chunyan.zhang@unisoc.com>
7
8 #include <linux/delay.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/highmem.h>
11 #include <linux/iopoll.h>
12 #include <linux/mmc/host.h>
13 #include <linux/mmc/mmc.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/pinctrl/consumer.h>
17 #include <linux/platform_device.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/regulator/consumer.h>
20 #include <linux/slab.h>
21
22 #include "sdhci-pltfm.h"
23 #include "mmc_hsq.h"
24
25 /* SDHCI_ARGUMENT2 register high 16bit */
26 #define SDHCI_SPRD_ARG2_STUFF GENMASK(31, 16)
27
28 #define SDHCI_SPRD_REG_32_DLL_CFG 0x200
29 #define SDHCI_SPRD_DLL_ALL_CPST_EN (BIT(18) | BIT(24) | BIT(25) | BIT(26) | BIT(27))
30 #define SDHCI_SPRD_DLL_EN BIT(21)
31 #define SDHCI_SPRD_DLL_SEARCH_MODE BIT(16)
32 #define SDHCI_SPRD_DLL_INIT_COUNT 0xc00
33 #define SDHCI_SPRD_DLL_PHASE_INTERNAL 0x3
34
35 #define SDHCI_SPRD_REG_32_DLL_DLY 0x204
36
37 #define SDHCI_SPRD_REG_32_DLL_DLY_OFFSET 0x208
38 #define SDHCIBSPRD_IT_WR_DLY_INV BIT(5)
39 #define SDHCI_SPRD_BIT_CMD_DLY_INV BIT(13)
40 #define SDHCI_SPRD_BIT_POSRD_DLY_INV BIT(21)
41 #define SDHCI_SPRD_BIT_NEGRD_DLY_INV BIT(29)
42
43 #define SDHCI_SPRD_REG_32_DLL_STS0 0x210
44 #define SDHCI_SPRD_DLL_LOCKED BIT(18)
45
46 #define SDHCI_SPRD_REG_32_BUSY_POSI 0x250
47 #define SDHCI_SPRD_BIT_OUTR_CLK_AUTO_EN BIT(25)
48 #define SDHCI_SPRD_BIT_INNR_CLK_AUTO_EN BIT(24)
49
50 #define SDHCI_SPRD_REG_DEBOUNCE 0x28C
51 #define SDHCI_SPRD_BIT_DLL_BAK BIT(0)
52 #define SDHCI_SPRD_BIT_DLL_VAL BIT(1)
53
54 #define SDHCI_SPRD_INT_SIGNAL_MASK 0x1B7F410B
55
56 /* SDHCI_HOST_CONTROL2 */
57 #define SDHCI_SPRD_CTRL_HS200 0x0005
58 #define SDHCI_SPRD_CTRL_HS400 0x0006
59 #define SDHCI_SPRD_CTRL_HS400ES 0x0007
60
61 /*
62 * According to the standard specification, BIT(3) of SDHCI_SOFTWARE_RESET is
63 * reserved, and only used on Spreadtrum's design, the hardware cannot work
64 * if this bit is cleared.
65 * 1 : normal work
66 * 0 : hardware reset
67 */
68 #define SDHCI_HW_RESET_CARD BIT(3)
69
70 #define SDHCI_SPRD_MAX_CUR 0xFFFFFF
71 #define SDHCI_SPRD_CLK_MAX_DIV 1023
72
73 #define SDHCI_SPRD_CLK_DEF_RATE 26000000
74 #define SDHCI_SPRD_PHY_DLL_CLK 52000000
75
76 #define SDHCI_SPRD_MAX_RANGE 0xff
77 #define SDHCI_SPRD_CMD_DLY_MASK GENMASK(15, 8)
78 #define SDHCI_SPRD_POSRD_DLY_MASK GENMASK(23, 16)
79 #define SDHCI_SPRD_CPST_EN GENMASK(27, 24)
80
81 struct sdhci_sprd_host {
82 u32 version;
83 struct clk *clk_sdio;
84 struct clk *clk_enable;
85 struct clk *clk_2x_enable;
86 struct pinctrl *pinctrl;
87 struct pinctrl_state *pins_uhs;
88 struct pinctrl_state *pins_default;
89 u32 base_rate;
90 int flags; /* backup of host attribute */
91 u32 phy_delay[MMC_TIMING_MMC_HS400 + 2];
92 };
93
94 enum sdhci_sprd_tuning_type {
95 SDHCI_SPRD_TUNING_SD_HS_CMD,
96 SDHCI_SPRD_TUNING_SD_HS_DATA,
97 };
98
99 struct sdhci_sprd_phy_cfg {
100 const char *property;
101 u8 timing;
102 };
103
104 static const struct sdhci_sprd_phy_cfg sdhci_sprd_phy_cfgs[] = {
105 { "sprd,phy-delay-legacy", MMC_TIMING_LEGACY, },
106 { "sprd,phy-delay-sd-highspeed", MMC_TIMING_SD_HS, },
107 { "sprd,phy-delay-sd-uhs-sdr50", MMC_TIMING_UHS_SDR50, },
108 { "sprd,phy-delay-sd-uhs-sdr104", MMC_TIMING_UHS_SDR104, },
109 { "sprd,phy-delay-mmc-highspeed", MMC_TIMING_MMC_HS, },
110 { "sprd,phy-delay-mmc-ddr52", MMC_TIMING_MMC_DDR52, },
111 { "sprd,phy-delay-mmc-hs200", MMC_TIMING_MMC_HS200, },
112 { "sprd,phy-delay-mmc-hs400", MMC_TIMING_MMC_HS400, },
113 { "sprd,phy-delay-mmc-hs400es", MMC_TIMING_MMC_HS400 + 1, },
114 };
115
116 #define TO_SPRD_HOST(host) sdhci_pltfm_priv(sdhci_priv(host))
117
sdhci_sprd_init_config(struct sdhci_host * host)118 static void sdhci_sprd_init_config(struct sdhci_host *host)
119 {
120 u16 val;
121
122 /* set dll backup mode */
123 val = sdhci_readl(host, SDHCI_SPRD_REG_DEBOUNCE);
124 val |= SDHCI_SPRD_BIT_DLL_BAK | SDHCI_SPRD_BIT_DLL_VAL;
125 sdhci_writel(host, val, SDHCI_SPRD_REG_DEBOUNCE);
126 }
127
sdhci_sprd_readl(struct sdhci_host * host,int reg)128 static inline u32 sdhci_sprd_readl(struct sdhci_host *host, int reg)
129 {
130 if (unlikely(reg == SDHCI_MAX_CURRENT))
131 return SDHCI_SPRD_MAX_CUR;
132
133 return readl_relaxed(host->ioaddr + reg);
134 }
135
sdhci_sprd_writel(struct sdhci_host * host,u32 val,int reg)136 static inline void sdhci_sprd_writel(struct sdhci_host *host, u32 val, int reg)
137 {
138 /* SDHCI_MAX_CURRENT is reserved on Spreadtrum's platform */
139 if (unlikely(reg == SDHCI_MAX_CURRENT))
140 return;
141
142 if (unlikely(reg == SDHCI_SIGNAL_ENABLE || reg == SDHCI_INT_ENABLE))
143 val = val & SDHCI_SPRD_INT_SIGNAL_MASK;
144
145 writel_relaxed(val, host->ioaddr + reg);
146 }
147
sdhci_sprd_writew(struct sdhci_host * host,u16 val,int reg)148 static inline void sdhci_sprd_writew(struct sdhci_host *host, u16 val, int reg)
149 {
150 /* SDHCI_BLOCK_COUNT is Read Only on Spreadtrum's platform */
151 if (unlikely(reg == SDHCI_BLOCK_COUNT))
152 return;
153
154 writew_relaxed(val, host->ioaddr + reg);
155 }
156
sdhci_sprd_writeb(struct sdhci_host * host,u8 val,int reg)157 static inline void sdhci_sprd_writeb(struct sdhci_host *host, u8 val, int reg)
158 {
159 /*
160 * Since BIT(3) of SDHCI_SOFTWARE_RESET is reserved according to the
161 * standard specification, sdhci_reset() write this register directly
162 * without checking other reserved bits, that will clear BIT(3) which
163 * is defined as hardware reset on Spreadtrum's platform and clearing
164 * it by mistake will lead the card not work. So here we need to work
165 * around it.
166 */
167 if (unlikely(reg == SDHCI_SOFTWARE_RESET)) {
168 if (readb_relaxed(host->ioaddr + reg) & SDHCI_HW_RESET_CARD)
169 val |= SDHCI_HW_RESET_CARD;
170 }
171
172 writeb_relaxed(val, host->ioaddr + reg);
173 }
174
sdhci_sprd_sd_clk_off(struct sdhci_host * host)175 static inline void sdhci_sprd_sd_clk_off(struct sdhci_host *host)
176 {
177 u16 ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
178
179 ctrl &= ~SDHCI_CLOCK_CARD_EN;
180 sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
181 }
182
sdhci_sprd_sd_clk_on(struct sdhci_host * host)183 static inline void sdhci_sprd_sd_clk_on(struct sdhci_host *host)
184 {
185 u16 ctrl;
186
187 ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
188 ctrl |= SDHCI_CLOCK_CARD_EN;
189 sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
190 }
191
192 static inline void
sdhci_sprd_set_dll_invert(struct sdhci_host * host,u32 mask,bool en)193 sdhci_sprd_set_dll_invert(struct sdhci_host *host, u32 mask, bool en)
194 {
195 u32 dll_dly_offset;
196
197 dll_dly_offset = sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_DLY_OFFSET);
198 if (en)
199 dll_dly_offset |= mask;
200 else
201 dll_dly_offset &= ~mask;
202 sdhci_writel(host, dll_dly_offset, SDHCI_SPRD_REG_32_DLL_DLY_OFFSET);
203 }
204
sdhci_sprd_calc_div(u32 base_clk,u32 clk)205 static inline u32 sdhci_sprd_calc_div(u32 base_clk, u32 clk)
206 {
207 u32 div;
208
209 /* select 2x clock source */
210 if (base_clk <= clk * 2)
211 return 0;
212
213 div = (u32) (base_clk / (clk * 2));
214
215 if ((base_clk / div) > (clk * 2))
216 div++;
217
218 if (div % 2)
219 div = (div + 1) / 2;
220 else
221 div = div / 2;
222
223 if (div > SDHCI_SPRD_CLK_MAX_DIV)
224 div = SDHCI_SPRD_CLK_MAX_DIV;
225
226 return div;
227 }
228
_sdhci_sprd_set_clock(struct sdhci_host * host,unsigned int clk)229 static inline void _sdhci_sprd_set_clock(struct sdhci_host *host,
230 unsigned int clk)
231 {
232 struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
233 u32 div, val, mask;
234
235 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
236
237 div = sdhci_sprd_calc_div(sprd_host->base_rate, clk);
238 div = ((div & 0x300) >> 2) | ((div & 0xFF) << 8);
239 sdhci_enable_clk(host, div);
240
241 val = sdhci_readl(host, SDHCI_SPRD_REG_32_BUSY_POSI);
242 mask = SDHCI_SPRD_BIT_OUTR_CLK_AUTO_EN | SDHCI_SPRD_BIT_INNR_CLK_AUTO_EN;
243 /* Enable CLK_AUTO when the clock is greater than 400K. */
244 if (clk > 400000) {
245 if (mask != (val & mask)) {
246 val |= mask;
247 sdhci_writel(host, val, SDHCI_SPRD_REG_32_BUSY_POSI);
248 }
249 } else {
250 if (val & mask) {
251 val &= ~mask;
252 sdhci_writel(host, val, SDHCI_SPRD_REG_32_BUSY_POSI);
253 }
254 }
255 }
256
sdhci_sprd_enable_phy_dll(struct sdhci_host * host)257 static void sdhci_sprd_enable_phy_dll(struct sdhci_host *host)
258 {
259 u32 tmp;
260
261 tmp = sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_CFG);
262 tmp &= ~(SDHCI_SPRD_DLL_EN | SDHCI_SPRD_DLL_ALL_CPST_EN);
263 sdhci_writel(host, tmp, SDHCI_SPRD_REG_32_DLL_CFG);
264 /* wait 1ms */
265 usleep_range(1000, 1250);
266
267 tmp = sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_CFG);
268 tmp |= SDHCI_SPRD_DLL_ALL_CPST_EN | SDHCI_SPRD_DLL_SEARCH_MODE |
269 SDHCI_SPRD_DLL_INIT_COUNT | SDHCI_SPRD_DLL_PHASE_INTERNAL;
270 sdhci_writel(host, tmp, SDHCI_SPRD_REG_32_DLL_CFG);
271 /* wait 1ms */
272 usleep_range(1000, 1250);
273
274 tmp = sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_CFG);
275 tmp |= SDHCI_SPRD_DLL_EN;
276 sdhci_writel(host, tmp, SDHCI_SPRD_REG_32_DLL_CFG);
277 /* wait 1ms */
278 usleep_range(1000, 1250);
279
280 if (read_poll_timeout(sdhci_readl, tmp, (tmp & SDHCI_SPRD_DLL_LOCKED),
281 2000, USEC_PER_SEC, false, host, SDHCI_SPRD_REG_32_DLL_STS0)) {
282 pr_err("%s: DLL locked fail!\n", mmc_hostname(host->mmc));
283 pr_info("%s: DLL_STS0 : 0x%x, DLL_CFG : 0x%x\n",
284 mmc_hostname(host->mmc),
285 sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_STS0),
286 sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_CFG));
287 }
288 }
289
sdhci_sprd_set_clock(struct sdhci_host * host,unsigned int clock)290 static void sdhci_sprd_set_clock(struct sdhci_host *host, unsigned int clock)
291 {
292 bool en = false, clk_changed = false;
293
294 if (clock == 0) {
295 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
296 } else if (clock != host->clock) {
297 sdhci_sprd_sd_clk_off(host);
298 _sdhci_sprd_set_clock(host, clock);
299
300 if (clock <= 400000)
301 en = true;
302 sdhci_sprd_set_dll_invert(host, SDHCI_SPRD_BIT_CMD_DLY_INV |
303 SDHCI_SPRD_BIT_POSRD_DLY_INV, en);
304 clk_changed = true;
305 } else {
306 _sdhci_sprd_set_clock(host, clock);
307 }
308
309 /*
310 * According to the Spreadtrum SD host specification, when we changed
311 * the clock to be more than 52M, we should enable the PHY DLL which
312 * is used to track the clock frequency to make the clock work more
313 * stable. Otherwise deviation may occur of the higher clock.
314 */
315 if (clk_changed && clock > SDHCI_SPRD_PHY_DLL_CLK)
316 sdhci_sprd_enable_phy_dll(host);
317 }
318
sdhci_sprd_get_max_clock(struct sdhci_host * host)319 static unsigned int sdhci_sprd_get_max_clock(struct sdhci_host *host)
320 {
321 struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
322
323 return clk_round_rate(sprd_host->clk_sdio, ULONG_MAX);
324 }
325
sdhci_sprd_get_min_clock(struct sdhci_host * host)326 static unsigned int sdhci_sprd_get_min_clock(struct sdhci_host *host)
327 {
328 return 100000;
329 }
330
sdhci_sprd_set_uhs_signaling(struct sdhci_host * host,unsigned int timing)331 static void sdhci_sprd_set_uhs_signaling(struct sdhci_host *host,
332 unsigned int timing)
333 {
334 struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
335 struct mmc_host *mmc = host->mmc;
336 u32 *p = sprd_host->phy_delay;
337 u16 ctrl_2;
338
339 if (timing == host->timing)
340 return;
341
342 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
343 /* Select Bus Speed Mode for host */
344 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
345 switch (timing) {
346 case MMC_TIMING_UHS_SDR12:
347 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
348 break;
349 case MMC_TIMING_MMC_HS:
350 case MMC_TIMING_SD_HS:
351 case MMC_TIMING_UHS_SDR25:
352 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
353 break;
354 case MMC_TIMING_UHS_SDR50:
355 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
356 break;
357 case MMC_TIMING_UHS_SDR104:
358 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
359 break;
360 case MMC_TIMING_UHS_DDR50:
361 case MMC_TIMING_MMC_DDR52:
362 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
363 break;
364 case MMC_TIMING_MMC_HS200:
365 ctrl_2 |= SDHCI_SPRD_CTRL_HS200;
366 break;
367 case MMC_TIMING_MMC_HS400:
368 ctrl_2 |= SDHCI_SPRD_CTRL_HS400;
369 break;
370 default:
371 break;
372 }
373
374 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
375
376 if (!mmc->ios.enhanced_strobe)
377 sdhci_writel(host, p[timing], SDHCI_SPRD_REG_32_DLL_DLY);
378 }
379
sdhci_sprd_hw_reset(struct sdhci_host * host)380 static void sdhci_sprd_hw_reset(struct sdhci_host *host)
381 {
382 int val;
383
384 /*
385 * Note: don't use sdhci_writeb() API here since it is redirected to
386 * sdhci_sprd_writeb() in which we have a workaround for
387 * SDHCI_SOFTWARE_RESET which would make bit SDHCI_HW_RESET_CARD can
388 * not be cleared.
389 */
390 val = readb_relaxed(host->ioaddr + SDHCI_SOFTWARE_RESET);
391 val &= ~SDHCI_HW_RESET_CARD;
392 writeb_relaxed(val, host->ioaddr + SDHCI_SOFTWARE_RESET);
393 /* wait for 10 us */
394 usleep_range(10, 20);
395
396 val |= SDHCI_HW_RESET_CARD;
397 writeb_relaxed(val, host->ioaddr + SDHCI_SOFTWARE_RESET);
398 usleep_range(300, 500);
399 }
400
sdhci_sprd_get_max_timeout_count(struct sdhci_host * host)401 static unsigned int sdhci_sprd_get_max_timeout_count(struct sdhci_host *host)
402 {
403 /* The Spredtrum controller actual maximum timeout count is 1 << 31 */
404 return 1 << 31;
405 }
406
sdhci_sprd_get_ro(struct sdhci_host * host)407 static unsigned int sdhci_sprd_get_ro(struct sdhci_host *host)
408 {
409 return 0;
410 }
411
sdhci_sprd_request_done(struct sdhci_host * host,struct mmc_request * mrq)412 static void sdhci_sprd_request_done(struct sdhci_host *host,
413 struct mmc_request *mrq)
414 {
415 /* Validate if the request was from software queue firstly. */
416 if (mmc_hsq_finalize_request(host->mmc, mrq))
417 return;
418
419 mmc_request_done(host->mmc, mrq);
420 }
421
sdhci_sprd_set_power(struct sdhci_host * host,unsigned char mode,unsigned short vdd)422 static void sdhci_sprd_set_power(struct sdhci_host *host, unsigned char mode,
423 unsigned short vdd)
424 {
425 struct mmc_host *mmc = host->mmc;
426
427 switch (mode) {
428 case MMC_POWER_OFF:
429 mmc_regulator_set_ocr(host->mmc, mmc->supply.vmmc, 0);
430
431 mmc_regulator_disable_vqmmc(mmc);
432 break;
433 case MMC_POWER_ON:
434 mmc_regulator_enable_vqmmc(mmc);
435 break;
436 case MMC_POWER_UP:
437 mmc_regulator_set_ocr(host->mmc, mmc->supply.vmmc, vdd);
438 break;
439 }
440 }
441
442 static const struct sdhci_ops sdhci_sprd_ops = {
443 .read_l = sdhci_sprd_readl,
444 .write_l = sdhci_sprd_writel,
445 .write_w = sdhci_sprd_writew,
446 .write_b = sdhci_sprd_writeb,
447 .set_clock = sdhci_sprd_set_clock,
448 .set_power = sdhci_sprd_set_power,
449 .get_max_clock = sdhci_sprd_get_max_clock,
450 .get_min_clock = sdhci_sprd_get_min_clock,
451 .set_bus_width = sdhci_set_bus_width,
452 .reset = sdhci_reset,
453 .set_uhs_signaling = sdhci_sprd_set_uhs_signaling,
454 .hw_reset = sdhci_sprd_hw_reset,
455 .get_max_timeout_count = sdhci_sprd_get_max_timeout_count,
456 .get_ro = sdhci_sprd_get_ro,
457 .request_done = sdhci_sprd_request_done,
458 };
459
sdhci_sprd_check_auto_cmd23(struct mmc_host * mmc,struct mmc_request * mrq)460 static void sdhci_sprd_check_auto_cmd23(struct mmc_host *mmc,
461 struct mmc_request *mrq)
462 {
463 struct sdhci_host *host = mmc_priv(mmc);
464 struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
465
466 host->flags |= sprd_host->flags & SDHCI_AUTO_CMD23;
467
468 /*
469 * From version 4.10 onward, ARGUMENT2 register is also as 32-bit
470 * block count register which doesn't support stuff bits of
471 * CMD23 argument on Spreadtrum's sd host controller.
472 */
473 if (host->version >= SDHCI_SPEC_410 &&
474 mrq->sbc && (mrq->sbc->arg & SDHCI_SPRD_ARG2_STUFF) &&
475 (host->flags & SDHCI_AUTO_CMD23))
476 host->flags &= ~SDHCI_AUTO_CMD23;
477 }
478
sdhci_sprd_request(struct mmc_host * mmc,struct mmc_request * mrq)479 static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq)
480 {
481 sdhci_sprd_check_auto_cmd23(mmc, mrq);
482
483 sdhci_request(mmc, mrq);
484 }
485
sdhci_sprd_request_atomic(struct mmc_host * mmc,struct mmc_request * mrq)486 static int sdhci_sprd_request_atomic(struct mmc_host *mmc,
487 struct mmc_request *mrq)
488 {
489 sdhci_sprd_check_auto_cmd23(mmc, mrq);
490
491 return sdhci_request_atomic(mmc, mrq);
492 }
493
sdhci_sprd_voltage_switch(struct mmc_host * mmc,struct mmc_ios * ios)494 static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
495 {
496 struct sdhci_host *host = mmc_priv(mmc);
497 struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
498 int ret;
499
500 if (!IS_ERR(mmc->supply.vqmmc)) {
501 ret = mmc_regulator_set_vqmmc(mmc, ios);
502 if (ret < 0) {
503 pr_err("%s: Switching signalling voltage failed\n",
504 mmc_hostname(mmc));
505 return ret;
506 }
507 }
508
509 if (IS_ERR(sprd_host->pinctrl))
510 goto reset;
511
512 switch (ios->signal_voltage) {
513 case MMC_SIGNAL_VOLTAGE_180:
514 ret = pinctrl_select_state(sprd_host->pinctrl,
515 sprd_host->pins_uhs);
516 if (ret) {
517 pr_err("%s: failed to select uhs pin state\n",
518 mmc_hostname(mmc));
519 return ret;
520 }
521 break;
522
523 default:
524 fallthrough;
525 case MMC_SIGNAL_VOLTAGE_330:
526 ret = pinctrl_select_state(sprd_host->pinctrl,
527 sprd_host->pins_default);
528 if (ret) {
529 pr_err("%s: failed to select default pin state\n",
530 mmc_hostname(mmc));
531 return ret;
532 }
533 break;
534 }
535
536 /* Wait for 300 ~ 500 us for pin state stable */
537 usleep_range(300, 500);
538
539 reset:
540 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
541
542 return 0;
543 }
544
sdhci_sprd_hs400_enhanced_strobe(struct mmc_host * mmc,struct mmc_ios * ios)545 static void sdhci_sprd_hs400_enhanced_strobe(struct mmc_host *mmc,
546 struct mmc_ios *ios)
547 {
548 struct sdhci_host *host = mmc_priv(mmc);
549 struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
550 u32 *p = sprd_host->phy_delay;
551 u16 ctrl_2;
552
553 if (!ios->enhanced_strobe)
554 return;
555
556 sdhci_sprd_sd_clk_off(host);
557
558 /* Set HS400 enhanced strobe mode */
559 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
560 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
561 ctrl_2 |= SDHCI_SPRD_CTRL_HS400ES;
562 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
563
564 sdhci_sprd_sd_clk_on(host);
565
566 /* Set the PHY DLL delay value for HS400 enhanced strobe mode */
567 sdhci_writel(host, p[MMC_TIMING_MMC_HS400 + 1],
568 SDHCI_SPRD_REG_32_DLL_DLY);
569 }
570
mmc_send_tuning_cmd(struct mmc_card * card)571 static int mmc_send_tuning_cmd(struct mmc_card *card)
572 {
573 return mmc_send_status(card, NULL);
574 }
575
mmc_send_tuning_data(struct mmc_card * card)576 static int mmc_send_tuning_data(struct mmc_card *card)
577 {
578 u8 *status;
579 int ret;
580
581 status = kmalloc(64, GFP_KERNEL);
582 if (!status)
583 return -ENOMEM;
584
585 ret = mmc_sd_switch(card, 0, 0, 0, status);
586
587 kfree(status);
588
589 return ret;
590 }
591
sdhci_sprd_get_best_clk_sample(struct mmc_host * mmc,u8 * value)592 static int sdhci_sprd_get_best_clk_sample(struct mmc_host *mmc, u8 *value)
593 {
594 int range_end = SDHCI_SPRD_MAX_RANGE;
595 int range_length = 0;
596 int middle_range = 0;
597 int count = 0;
598 int i;
599
600 for (i = 0; i <= SDHCI_SPRD_MAX_RANGE; i++) {
601 if (value[i]) {
602 pr_debug("%s: tuning ok: %d\n", mmc_hostname(mmc), i);
603 count++;
604 } else {
605 pr_debug("%s: tuning fail: %d\n", mmc_hostname(mmc), i);
606 if (range_length < count) {
607 range_length = count;
608 range_end = i - 1;
609 count = 0;
610 }
611 }
612 }
613
614 if (!count)
615 return -EIO;
616
617 if (count > range_length) {
618 range_length = count;
619 range_end = i - 1;
620 }
621
622 middle_range = range_end - (range_length - 1) / 2;
623
624 return middle_range;
625 }
626
sdhci_sprd_tuning(struct mmc_host * mmc,struct mmc_card * card,enum sdhci_sprd_tuning_type type)627 static int sdhci_sprd_tuning(struct mmc_host *mmc, struct mmc_card *card,
628 enum sdhci_sprd_tuning_type type)
629 {
630 struct sdhci_host *host = mmc_priv(mmc);
631 struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
632 u32 *p = sprd_host->phy_delay;
633 u32 dll_cfg, dll_dly;
634 int best_clk_sample;
635 int err = 0;
636 u8 *value;
637 int i;
638
639 value = kmalloc(SDHCI_SPRD_MAX_RANGE + 1, GFP_KERNEL);
640 if (!value)
641 return -ENOMEM;
642
643 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
644
645 dll_cfg = sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_CFG);
646 dll_cfg &= ~SDHCI_SPRD_CPST_EN;
647 sdhci_writel(host, dll_cfg, SDHCI_SPRD_REG_32_DLL_CFG);
648
649 dll_dly = p[mmc->ios.timing];
650
651 for (i = 0; i <= SDHCI_SPRD_MAX_RANGE; i++) {
652 if (type == SDHCI_SPRD_TUNING_SD_HS_CMD) {
653 dll_dly &= ~SDHCI_SPRD_CMD_DLY_MASK;
654 dll_dly |= ((i << 8) & SDHCI_SPRD_CMD_DLY_MASK);
655 } else {
656 dll_dly &= ~SDHCI_SPRD_POSRD_DLY_MASK;
657 dll_dly |= ((i << 16) & SDHCI_SPRD_POSRD_DLY_MASK);
658 }
659
660 sdhci_writel(host, dll_dly, SDHCI_SPRD_REG_32_DLL_DLY);
661
662 if (type == SDHCI_SPRD_TUNING_SD_HS_CMD)
663 value[i] = !mmc_send_tuning_cmd(card);
664 else
665 value[i] = !mmc_send_tuning_data(card);
666 }
667
668 best_clk_sample = sdhci_sprd_get_best_clk_sample(mmc, value);
669 if (best_clk_sample < 0) {
670 dev_err(mmc_dev(host->mmc), "all tuning phase fail!\n");
671 err = best_clk_sample;
672 goto out;
673 }
674
675 if (type == SDHCI_SPRD_TUNING_SD_HS_CMD) {
676 p[mmc->ios.timing] &= ~SDHCI_SPRD_CMD_DLY_MASK;
677 p[mmc->ios.timing] |= ((best_clk_sample << 8) & SDHCI_SPRD_CMD_DLY_MASK);
678 } else {
679 p[mmc->ios.timing] &= ~(SDHCI_SPRD_POSRD_DLY_MASK);
680 p[mmc->ios.timing] |= ((best_clk_sample << 16) & SDHCI_SPRD_POSRD_DLY_MASK);
681 }
682
683 pr_debug("%s: the best clk sample %d, delay value 0x%08x\n",
684 mmc_hostname(host->mmc), best_clk_sample, p[mmc->ios.timing]);
685
686 out:
687 sdhci_writel(host, p[mmc->ios.timing], SDHCI_SPRD_REG_32_DLL_DLY);
688
689 kfree(value);
690
691 return err;
692 }
693
sdhci_sprd_prepare_sd_hs_cmd_tuning(struct mmc_host * mmc,struct mmc_card * card)694 static int sdhci_sprd_prepare_sd_hs_cmd_tuning(struct mmc_host *mmc, struct mmc_card *card)
695 {
696 return sdhci_sprd_tuning(mmc, card, SDHCI_SPRD_TUNING_SD_HS_CMD);
697 }
698
sdhci_sprd_execute_sd_hs_data_tuning(struct mmc_host * mmc,struct mmc_card * card)699 static int sdhci_sprd_execute_sd_hs_data_tuning(struct mmc_host *mmc, struct mmc_card *card)
700 {
701 return sdhci_sprd_tuning(mmc, card, SDHCI_SPRD_TUNING_SD_HS_DATA);
702 }
703
sdhci_sprd_phy_param_parse(struct sdhci_sprd_host * sprd_host,struct device_node * np)704 static void sdhci_sprd_phy_param_parse(struct sdhci_sprd_host *sprd_host,
705 struct device_node *np)
706 {
707 u32 *p = sprd_host->phy_delay;
708 int ret, i, index;
709 u32 val[4];
710
711 for (i = 0; i < ARRAY_SIZE(sdhci_sprd_phy_cfgs); i++) {
712 ret = of_property_read_u32_array(np,
713 sdhci_sprd_phy_cfgs[i].property, val, 4);
714 if (ret)
715 continue;
716
717 index = sdhci_sprd_phy_cfgs[i].timing;
718 p[index] = val[0] | (val[1] << 8) | (val[2] << 16) | (val[3] << 24);
719 }
720 }
721
722 static const struct sdhci_pltfm_data sdhci_sprd_pdata = {
723 .quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
724 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK,
725 .quirks2 = SDHCI_QUIRK2_BROKEN_HS200 |
726 SDHCI_QUIRK2_USE_32BIT_BLK_CNT |
727 SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
728 .ops = &sdhci_sprd_ops,
729 };
730
sdhci_sprd_probe(struct platform_device * pdev)731 static int sdhci_sprd_probe(struct platform_device *pdev)
732 {
733 struct sdhci_host *host;
734 struct sdhci_sprd_host *sprd_host;
735 struct mmc_hsq *hsq;
736 struct clk *clk;
737 int ret = 0;
738
739 host = sdhci_pltfm_init(pdev, &sdhci_sprd_pdata, sizeof(*sprd_host));
740 if (IS_ERR(host))
741 return PTR_ERR(host);
742
743 host->dma_mask = DMA_BIT_MASK(64);
744 pdev->dev.dma_mask = &host->dma_mask;
745 host->mmc_host_ops.request = sdhci_sprd_request;
746 host->mmc_host_ops.hs400_enhanced_strobe =
747 sdhci_sprd_hs400_enhanced_strobe;
748 host->mmc_host_ops.prepare_sd_hs_tuning =
749 sdhci_sprd_prepare_sd_hs_cmd_tuning;
750 host->mmc_host_ops.execute_sd_hs_tuning =
751 sdhci_sprd_execute_sd_hs_data_tuning;
752
753 /*
754 * We can not use the standard ops to change and detect the voltage
755 * signal for Spreadtrum SD host controller, since our voltage regulator
756 * for I/O is fixed in hardware, that means we do not need control
757 * the standard SD host controller to change the I/O voltage.
758 */
759 host->mmc_host_ops.start_signal_voltage_switch =
760 sdhci_sprd_voltage_switch;
761
762 host->mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
763 MMC_CAP_WAIT_WHILE_BUSY;
764
765 ret = mmc_of_parse(host->mmc);
766 if (ret)
767 goto pltfm_free;
768
769 if (!mmc_card_is_removable(host->mmc))
770 host->mmc_host_ops.request_atomic = sdhci_sprd_request_atomic;
771 else
772 host->always_defer_done = true;
773
774 sprd_host = TO_SPRD_HOST(host);
775 sdhci_sprd_phy_param_parse(sprd_host, pdev->dev.of_node);
776
777 sprd_host->pinctrl = devm_pinctrl_get(&pdev->dev);
778 if (!IS_ERR(sprd_host->pinctrl)) {
779 sprd_host->pins_uhs =
780 pinctrl_lookup_state(sprd_host->pinctrl, "state_uhs");
781 if (IS_ERR(sprd_host->pins_uhs)) {
782 ret = PTR_ERR(sprd_host->pins_uhs);
783 goto pltfm_free;
784 }
785
786 sprd_host->pins_default =
787 pinctrl_lookup_state(sprd_host->pinctrl, "default");
788 if (IS_ERR(sprd_host->pins_default)) {
789 ret = PTR_ERR(sprd_host->pins_default);
790 goto pltfm_free;
791 }
792 }
793
794 clk = devm_clk_get(&pdev->dev, "sdio");
795 if (IS_ERR(clk)) {
796 ret = PTR_ERR(clk);
797 goto pltfm_free;
798 }
799 sprd_host->clk_sdio = clk;
800 sprd_host->base_rate = clk_get_rate(sprd_host->clk_sdio);
801 if (!sprd_host->base_rate)
802 sprd_host->base_rate = SDHCI_SPRD_CLK_DEF_RATE;
803
804 clk = devm_clk_get(&pdev->dev, "enable");
805 if (IS_ERR(clk)) {
806 ret = PTR_ERR(clk);
807 goto pltfm_free;
808 }
809 sprd_host->clk_enable = clk;
810
811 clk = devm_clk_get(&pdev->dev, "2x_enable");
812 if (!IS_ERR(clk))
813 sprd_host->clk_2x_enable = clk;
814
815 ret = clk_prepare_enable(sprd_host->clk_sdio);
816 if (ret)
817 goto pltfm_free;
818
819 ret = clk_prepare_enable(sprd_host->clk_enable);
820 if (ret)
821 goto clk_disable;
822
823 ret = clk_prepare_enable(sprd_host->clk_2x_enable);
824 if (ret)
825 goto clk_disable2;
826
827 sdhci_sprd_init_config(host);
828 host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
829 sprd_host->version = ((host->version & SDHCI_VENDOR_VER_MASK) >>
830 SDHCI_VENDOR_VER_SHIFT);
831
832 pm_runtime_get_noresume(&pdev->dev);
833 pm_runtime_set_active(&pdev->dev);
834 pm_runtime_enable(&pdev->dev);
835 pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
836 pm_runtime_use_autosuspend(&pdev->dev);
837 pm_suspend_ignore_children(&pdev->dev, 1);
838
839 sdhci_enable_v4_mode(host);
840
841 /*
842 * Supply the existing CAPS, but clear the UHS-I modes. This
843 * will allow these modes to be specified only by device
844 * tree properties through mmc_of_parse().
845 */
846 sdhci_read_caps(host);
847 host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
848 SDHCI_SUPPORT_DDR50);
849
850 ret = mmc_regulator_get_supply(host->mmc);
851 if (ret)
852 goto pm_runtime_disable;
853
854 ret = sdhci_setup_host(host);
855 if (ret)
856 goto pm_runtime_disable;
857
858 sprd_host->flags = host->flags;
859
860 hsq = devm_kzalloc(&pdev->dev, sizeof(*hsq), GFP_KERNEL);
861 if (!hsq) {
862 ret = -ENOMEM;
863 goto err_cleanup_host;
864 }
865
866 ret = mmc_hsq_init(hsq, host->mmc);
867 if (ret)
868 goto err_cleanup_host;
869
870 ret = __sdhci_add_host(host);
871 if (ret)
872 goto err_cleanup_host;
873
874 pm_runtime_mark_last_busy(&pdev->dev);
875 pm_runtime_put_autosuspend(&pdev->dev);
876
877 return 0;
878
879 err_cleanup_host:
880 sdhci_cleanup_host(host);
881
882 pm_runtime_disable:
883 pm_runtime_put_noidle(&pdev->dev);
884 pm_runtime_disable(&pdev->dev);
885 pm_runtime_set_suspended(&pdev->dev);
886
887 clk_disable_unprepare(sprd_host->clk_2x_enable);
888
889 clk_disable2:
890 clk_disable_unprepare(sprd_host->clk_enable);
891
892 clk_disable:
893 clk_disable_unprepare(sprd_host->clk_sdio);
894
895 pltfm_free:
896 sdhci_pltfm_free(pdev);
897 return ret;
898 }
899
sdhci_sprd_remove(struct platform_device * pdev)900 static void sdhci_sprd_remove(struct platform_device *pdev)
901 {
902 struct sdhci_host *host = platform_get_drvdata(pdev);
903 struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
904
905 sdhci_remove_host(host, 0);
906
907 clk_disable_unprepare(sprd_host->clk_sdio);
908 clk_disable_unprepare(sprd_host->clk_enable);
909 clk_disable_unprepare(sprd_host->clk_2x_enable);
910
911 sdhci_pltfm_free(pdev);
912 }
913
914 static const struct of_device_id sdhci_sprd_of_match[] = {
915 { .compatible = "sprd,sdhci-r11", },
916 { }
917 };
918 MODULE_DEVICE_TABLE(of, sdhci_sprd_of_match);
919
920 #ifdef CONFIG_PM
sdhci_sprd_runtime_suspend(struct device * dev)921 static int sdhci_sprd_runtime_suspend(struct device *dev)
922 {
923 struct sdhci_host *host = dev_get_drvdata(dev);
924 struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
925
926 mmc_hsq_suspend(host->mmc);
927 sdhci_runtime_suspend_host(host);
928
929 clk_disable_unprepare(sprd_host->clk_sdio);
930 clk_disable_unprepare(sprd_host->clk_enable);
931 clk_disable_unprepare(sprd_host->clk_2x_enable);
932
933 return 0;
934 }
935
sdhci_sprd_runtime_resume(struct device * dev)936 static int sdhci_sprd_runtime_resume(struct device *dev)
937 {
938 struct sdhci_host *host = dev_get_drvdata(dev);
939 struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
940 int ret;
941
942 ret = clk_prepare_enable(sprd_host->clk_2x_enable);
943 if (ret)
944 return ret;
945
946 ret = clk_prepare_enable(sprd_host->clk_enable);
947 if (ret)
948 goto clk_2x_disable;
949
950 ret = clk_prepare_enable(sprd_host->clk_sdio);
951 if (ret)
952 goto clk_disable;
953
954 sdhci_runtime_resume_host(host, 1);
955 mmc_hsq_resume(host->mmc);
956
957 return 0;
958
959 clk_disable:
960 clk_disable_unprepare(sprd_host->clk_enable);
961
962 clk_2x_disable:
963 clk_disable_unprepare(sprd_host->clk_2x_enable);
964
965 return ret;
966 }
967 #endif
968
969 static const struct dev_pm_ops sdhci_sprd_pm_ops = {
970 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
971 pm_runtime_force_resume)
972 SET_RUNTIME_PM_OPS(sdhci_sprd_runtime_suspend,
973 sdhci_sprd_runtime_resume, NULL)
974 };
975
976 static struct platform_driver sdhci_sprd_driver = {
977 .probe = sdhci_sprd_probe,
978 .remove_new = sdhci_sprd_remove,
979 .driver = {
980 .name = "sdhci_sprd_r11",
981 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
982 .of_match_table = sdhci_sprd_of_match,
983 .pm = &sdhci_sprd_pm_ops,
984 },
985 };
986 module_platform_driver(sdhci_sprd_driver);
987
988 MODULE_DESCRIPTION("Spreadtrum sdio host controller r11 driver");
989 MODULE_LICENSE("GPL v2");
990 MODULE_ALIAS("platform:sdhci-sprd-r11");
991