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[J-u-boot.git] / drivers / mmc / stm32_sdmmc2.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
4  * Author(s): Patrice Chotard, <[email protected]> for STMicroelectronics.
5  */
6
7 #define LOG_CATEGORY UCLASS_MMC
8
9 #include <common.h>
10 #include <clk.h>
11 #include <cpu_func.h>
12 #include <dm.h>
13 #include <fdtdec.h>
14 #include <log.h>
15 #include <malloc.h>
16 #include <asm/bitops.h>
17 #include <asm/cache.h>
18 #include <dm/device_compat.h>
19 #include <dm/pinctrl.h>
20 #include <linux/bitops.h>
21 #include <linux/delay.h>
22 #include <linux/libfdt.h>
23 #include <mmc.h>
24 #include <reset.h>
25 #include <asm/io.h>
26 #include <asm/gpio.h>
27 #include <linux/iopoll.h>
28 #include <power/regulator.h>
29 #include <watchdog.h>
30 #include <linux/printk.h>
31
32 struct stm32_sdmmc2_plat {
33         struct mmc_config cfg;
34         struct mmc mmc;
35         fdt_addr_t base;
36         struct clk clk;
37         struct reset_ctl reset_ctl;
38         struct gpio_desc cd_gpio;
39         u32 clk_reg_msk;
40         u32 pwr_reg_msk;
41 #if CONFIG_IS_ENABLED(DM_REGULATOR)
42         bool vqmmc_enabled;
43 #endif
44 };
45
46 struct stm32_sdmmc2_ctx {
47         u32 cache_start;
48         u32 cache_end;
49         u32 data_length;
50         bool dpsm_abort;
51 };
52
53 /* SDMMC REGISTERS OFFSET */
54 #define SDMMC_POWER             0x00    /* SDMMC power control             */
55 #define SDMMC_CLKCR             0x04    /* SDMMC clock control             */
56 #define SDMMC_ARG               0x08    /* SDMMC argument                  */
57 #define SDMMC_CMD               0x0C    /* SDMMC command                   */
58 #define SDMMC_RESP1             0x14    /* SDMMC response 1                */
59 #define SDMMC_RESP2             0x18    /* SDMMC response 2                */
60 #define SDMMC_RESP3             0x1C    /* SDMMC response 3                */
61 #define SDMMC_RESP4             0x20    /* SDMMC response 4                */
62 #define SDMMC_DTIMER            0x24    /* SDMMC data timer                */
63 #define SDMMC_DLEN              0x28    /* SDMMC data length               */
64 #define SDMMC_DCTRL             0x2C    /* SDMMC data control              */
65 #define SDMMC_DCOUNT            0x30    /* SDMMC data counter              */
66 #define SDMMC_STA               0x34    /* SDMMC status                    */
67 #define SDMMC_ICR               0x38    /* SDMMC interrupt clear           */
68 #define SDMMC_MASK              0x3C    /* SDMMC mask                      */
69 #define SDMMC_IDMACTRL          0x50    /* SDMMC DMA control               */
70 #define SDMMC_IDMABASE0         0x58    /* SDMMC DMA buffer 0 base address */
71
72 /* SDMMC_POWER register */
73 #define SDMMC_POWER_PWRCTRL_MASK        GENMASK(1, 0)
74 #define SDMMC_POWER_PWRCTRL_OFF         0
75 #define SDMMC_POWER_PWRCTRL_CYCLE       2
76 #define SDMMC_POWER_PWRCTRL_ON          3
77 #define SDMMC_POWER_VSWITCH             BIT(2)
78 #define SDMMC_POWER_VSWITCHEN           BIT(3)
79 #define SDMMC_POWER_DIRPOL              BIT(4)
80
81 /* SDMMC_CLKCR register */
82 #define SDMMC_CLKCR_CLKDIV              GENMASK(9, 0)
83 #define SDMMC_CLKCR_CLKDIV_MAX          SDMMC_CLKCR_CLKDIV
84 #define SDMMC_CLKCR_PWRSAV              BIT(12)
85 #define SDMMC_CLKCR_WIDBUS_4            BIT(14)
86 #define SDMMC_CLKCR_WIDBUS_8            BIT(15)
87 #define SDMMC_CLKCR_NEGEDGE             BIT(16)
88 #define SDMMC_CLKCR_HWFC_EN             BIT(17)
89 #define SDMMC_CLKCR_DDR                 BIT(18)
90 #define SDMMC_CLKCR_BUSSPEED            BIT(19)
91 #define SDMMC_CLKCR_SELCLKRX_MASK       GENMASK(21, 20)
92 #define SDMMC_CLKCR_SELCLKRX_CK         0
93 #define SDMMC_CLKCR_SELCLKRX_CKIN       BIT(20)
94 #define SDMMC_CLKCR_SELCLKRX_FBCK       BIT(21)
95
96 /* SDMMC_CMD register */
97 #define SDMMC_CMD_CMDINDEX              GENMASK(5, 0)
98 #define SDMMC_CMD_CMDTRANS              BIT(6)
99 #define SDMMC_CMD_CMDSTOP               BIT(7)
100 #define SDMMC_CMD_WAITRESP              GENMASK(9, 8)
101 #define SDMMC_CMD_WAITRESP_0            BIT(8)
102 #define SDMMC_CMD_WAITRESP_1            BIT(9)
103 #define SDMMC_CMD_WAITINT               BIT(10)
104 #define SDMMC_CMD_WAITPEND              BIT(11)
105 #define SDMMC_CMD_CPSMEN                BIT(12)
106 #define SDMMC_CMD_DTHOLD                BIT(13)
107 #define SDMMC_CMD_BOOTMODE              BIT(14)
108 #define SDMMC_CMD_BOOTEN                BIT(15)
109 #define SDMMC_CMD_CMDSUSPEND            BIT(16)
110
111 /* SDMMC_DCTRL register */
112 #define SDMMC_DCTRL_DTEN                BIT(0)
113 #define SDMMC_DCTRL_DTDIR               BIT(1)
114 #define SDMMC_DCTRL_DTMODE              GENMASK(3, 2)
115 #define SDMMC_DCTRL_DBLOCKSIZE          GENMASK(7, 4)
116 #define SDMMC_DCTRL_DBLOCKSIZE_SHIFT    4
117 #define SDMMC_DCTRL_RWSTART             BIT(8)
118 #define SDMMC_DCTRL_RWSTOP              BIT(9)
119 #define SDMMC_DCTRL_RWMOD               BIT(10)
120 #define SDMMC_DCTRL_SDMMCEN             BIT(11)
121 #define SDMMC_DCTRL_BOOTACKEN           BIT(12)
122 #define SDMMC_DCTRL_FIFORST             BIT(13)
123
124 /* SDMMC_STA register */
125 #define SDMMC_STA_CCRCFAIL              BIT(0)
126 #define SDMMC_STA_DCRCFAIL              BIT(1)
127 #define SDMMC_STA_CTIMEOUT              BIT(2)
128 #define SDMMC_STA_DTIMEOUT              BIT(3)
129 #define SDMMC_STA_TXUNDERR              BIT(4)
130 #define SDMMC_STA_RXOVERR               BIT(5)
131 #define SDMMC_STA_CMDREND               BIT(6)
132 #define SDMMC_STA_CMDSENT               BIT(7)
133 #define SDMMC_STA_DATAEND               BIT(8)
134 #define SDMMC_STA_DHOLD                 BIT(9)
135 #define SDMMC_STA_DBCKEND               BIT(10)
136 #define SDMMC_STA_DABORT                BIT(11)
137 #define SDMMC_STA_DPSMACT               BIT(12)
138 #define SDMMC_STA_CPSMACT               BIT(13)
139 #define SDMMC_STA_TXFIFOHE              BIT(14)
140 #define SDMMC_STA_RXFIFOHF              BIT(15)
141 #define SDMMC_STA_TXFIFOF               BIT(16)
142 #define SDMMC_STA_RXFIFOF               BIT(17)
143 #define SDMMC_STA_TXFIFOE               BIT(18)
144 #define SDMMC_STA_RXFIFOE               BIT(19)
145 #define SDMMC_STA_BUSYD0                BIT(20)
146 #define SDMMC_STA_BUSYD0END             BIT(21)
147 #define SDMMC_STA_SDMMCIT               BIT(22)
148 #define SDMMC_STA_ACKFAIL               BIT(23)
149 #define SDMMC_STA_ACKTIMEOUT            BIT(24)
150 #define SDMMC_STA_VSWEND                BIT(25)
151 #define SDMMC_STA_CKSTOP                BIT(26)
152 #define SDMMC_STA_IDMATE                BIT(27)
153 #define SDMMC_STA_IDMABTC               BIT(28)
154
155 /* SDMMC_ICR register */
156 #define SDMMC_ICR_CCRCFAILC             BIT(0)
157 #define SDMMC_ICR_DCRCFAILC             BIT(1)
158 #define SDMMC_ICR_CTIMEOUTC             BIT(2)
159 #define SDMMC_ICR_DTIMEOUTC             BIT(3)
160 #define SDMMC_ICR_TXUNDERRC             BIT(4)
161 #define SDMMC_ICR_RXOVERRC              BIT(5)
162 #define SDMMC_ICR_CMDRENDC              BIT(6)
163 #define SDMMC_ICR_CMDSENTC              BIT(7)
164 #define SDMMC_ICR_DATAENDC              BIT(8)
165 #define SDMMC_ICR_DHOLDC                BIT(9)
166 #define SDMMC_ICR_DBCKENDC              BIT(10)
167 #define SDMMC_ICR_DABORTC               BIT(11)
168 #define SDMMC_ICR_BUSYD0ENDC            BIT(21)
169 #define SDMMC_ICR_SDMMCITC              BIT(22)
170 #define SDMMC_ICR_ACKFAILC              BIT(23)
171 #define SDMMC_ICR_ACKTIMEOUTC           BIT(24)
172 #define SDMMC_ICR_VSWENDC               BIT(25)
173 #define SDMMC_ICR_CKSTOPC               BIT(26)
174 #define SDMMC_ICR_IDMATEC               BIT(27)
175 #define SDMMC_ICR_IDMABTCC              BIT(28)
176 #define SDMMC_ICR_STATIC_FLAGS          ((GENMASK(28, 21)) | (GENMASK(11, 0)))
177
178 /* SDMMC_MASK register */
179 #define SDMMC_MASK_CCRCFAILIE           BIT(0)
180 #define SDMMC_MASK_DCRCFAILIE           BIT(1)
181 #define SDMMC_MASK_CTIMEOUTIE           BIT(2)
182 #define SDMMC_MASK_DTIMEOUTIE           BIT(3)
183 #define SDMMC_MASK_TXUNDERRIE           BIT(4)
184 #define SDMMC_MASK_RXOVERRIE            BIT(5)
185 #define SDMMC_MASK_CMDRENDIE            BIT(6)
186 #define SDMMC_MASK_CMDSENTIE            BIT(7)
187 #define SDMMC_MASK_DATAENDIE            BIT(8)
188 #define SDMMC_MASK_DHOLDIE              BIT(9)
189 #define SDMMC_MASK_DBCKENDIE            BIT(10)
190 #define SDMMC_MASK_DABORTIE             BIT(11)
191 #define SDMMC_MASK_TXFIFOHEIE           BIT(14)
192 #define SDMMC_MASK_RXFIFOHFIE           BIT(15)
193 #define SDMMC_MASK_RXFIFOFIE            BIT(17)
194 #define SDMMC_MASK_TXFIFOEIE            BIT(18)
195 #define SDMMC_MASK_BUSYD0ENDIE          BIT(21)
196 #define SDMMC_MASK_SDMMCITIE            BIT(22)
197 #define SDMMC_MASK_ACKFAILIE            BIT(23)
198 #define SDMMC_MASK_ACKTIMEOUTIE         BIT(24)
199 #define SDMMC_MASK_VSWENDIE             BIT(25)
200 #define SDMMC_MASK_CKSTOPIE             BIT(26)
201 #define SDMMC_MASK_IDMABTCIE            BIT(28)
202
203 /* SDMMC_IDMACTRL register */
204 #define SDMMC_IDMACTRL_IDMAEN           BIT(0)
205
206 #define SDMMC_CMD_TIMEOUT               0xFFFFFFFF
207 #define SDMMC_BUSYD0END_TIMEOUT_US      2000000
208
209 static void stm32_sdmmc2_start_data(struct udevice *dev,
210                                     struct mmc_data *data,
211                                     struct stm32_sdmmc2_ctx *ctx)
212 {
213         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
214         u32 data_ctrl, idmabase0;
215
216         /* Configure the SDMMC DPSM (Data Path State Machine) */
217         data_ctrl = (__ilog2(data->blocksize) <<
218                      SDMMC_DCTRL_DBLOCKSIZE_SHIFT) &
219                     SDMMC_DCTRL_DBLOCKSIZE;
220
221         if (data->flags & MMC_DATA_READ) {
222                 data_ctrl |= SDMMC_DCTRL_DTDIR;
223                 idmabase0 = (u32)data->dest;
224         } else {
225                 idmabase0 = (u32)data->src;
226         }
227
228         /* Set the SDMMC DataLength value */
229         writel(ctx->data_length, plat->base + SDMMC_DLEN);
230
231         /* Write to SDMMC DCTRL */
232         writel(data_ctrl, plat->base + SDMMC_DCTRL);
233
234         /* Cache align */
235         ctx->cache_start = rounddown(idmabase0, ARCH_DMA_MINALIGN);
236         ctx->cache_end = roundup(idmabase0 + ctx->data_length,
237                                  ARCH_DMA_MINALIGN);
238
239         /*
240          * Flush data cache before DMA start (clean and invalidate)
241          * Clean also needed for read
242          * Avoid issue on buffer not cached-aligned
243          */
244         flush_dcache_range(ctx->cache_start, ctx->cache_end);
245
246         /* Enable internal DMA */
247         writel(idmabase0, plat->base + SDMMC_IDMABASE0);
248         writel(SDMMC_IDMACTRL_IDMAEN, plat->base + SDMMC_IDMACTRL);
249 }
250
251 static void stm32_sdmmc2_start_cmd(struct udevice *dev,
252                                    struct mmc_cmd *cmd, u32 cmd_param,
253                                    struct stm32_sdmmc2_ctx *ctx)
254 {
255         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
256         u32 timeout = 0;
257
258         if (readl(plat->base + SDMMC_CMD) & SDMMC_CMD_CPSMEN)
259                 writel(0, plat->base + SDMMC_CMD);
260
261         cmd_param |= cmd->cmdidx | SDMMC_CMD_CPSMEN;
262         if (cmd->resp_type & MMC_RSP_PRESENT) {
263                 if (cmd->resp_type & MMC_RSP_136)
264                         cmd_param |= SDMMC_CMD_WAITRESP;
265                 else if (cmd->resp_type & MMC_RSP_CRC)
266                         cmd_param |= SDMMC_CMD_WAITRESP_0;
267                 else
268                         cmd_param |= SDMMC_CMD_WAITRESP_1;
269         }
270
271         /*
272          * SDMMC_DTIME must be set in two case:
273          * - on data transfert.
274          * - on busy request.
275          * If not done or too short, the dtimeout flag occurs and DPSM stays
276          * enabled/busy and waits for abort (stop transmission cmd).
277          * Next data command is not possible whereas DPSM is activated.
278          */
279         if (ctx->data_length) {
280                 timeout = SDMMC_CMD_TIMEOUT;
281         } else {
282                 writel(0, plat->base + SDMMC_DCTRL);
283
284                 if (cmd->resp_type & MMC_RSP_BUSY)
285                         timeout = SDMMC_CMD_TIMEOUT;
286         }
287
288         /* Set the SDMMC Data TimeOut value */
289         writel(timeout, plat->base + SDMMC_DTIMER);
290
291         /* Clear flags */
292         writel(SDMMC_ICR_STATIC_FLAGS, plat->base + SDMMC_ICR);
293
294         /* Set SDMMC argument value */
295         writel(cmd->cmdarg, plat->base + SDMMC_ARG);
296
297         /* Set SDMMC command parameters */
298         writel(cmd_param, plat->base + SDMMC_CMD);
299 }
300
301 static int stm32_sdmmc2_end_cmd(struct udevice *dev,
302                                 struct mmc_cmd *cmd,
303                                 struct stm32_sdmmc2_ctx *ctx)
304 {
305         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
306         u32 mask = SDMMC_STA_CTIMEOUT;
307         u32 status;
308         int ret;
309
310         if (cmd->resp_type & MMC_RSP_PRESENT) {
311                 mask |= SDMMC_STA_CMDREND;
312                 if (cmd->resp_type & MMC_RSP_CRC)
313                         mask |= SDMMC_STA_CCRCFAIL;
314         } else {
315                 mask |= SDMMC_STA_CMDSENT;
316         }
317
318         /* Polling status register */
319         ret = readl_poll_timeout(plat->base + SDMMC_STA, status, status & mask,
320                                  10000);
321
322         if (ret < 0) {
323                 dev_dbg(dev, "timeout reading SDMMC_STA register\n");
324                 ctx->dpsm_abort = true;
325                 return ret;
326         }
327
328         /* Check status */
329         if (status & SDMMC_STA_CTIMEOUT) {
330                 dev_dbg(dev, "error SDMMC_STA_CTIMEOUT (0x%x) for cmd %d\n",
331                         status, cmd->cmdidx);
332                 ctx->dpsm_abort = true;
333                 return -ETIMEDOUT;
334         }
335
336         if (status & SDMMC_STA_CCRCFAIL && cmd->resp_type & MMC_RSP_CRC) {
337                 dev_dbg(dev, "error SDMMC_STA_CCRCFAIL (0x%x) for cmd %d\n",
338                         status, cmd->cmdidx);
339                 ctx->dpsm_abort = true;
340                 return -EILSEQ;
341         }
342
343         if (status & SDMMC_STA_CMDREND && cmd->resp_type & MMC_RSP_PRESENT) {
344                 cmd->response[0] = readl(plat->base + SDMMC_RESP1);
345                 if (cmd->resp_type & MMC_RSP_136) {
346                         cmd->response[1] = readl(plat->base + SDMMC_RESP2);
347                         cmd->response[2] = readl(plat->base + SDMMC_RESP3);
348                         cmd->response[3] = readl(plat->base + SDMMC_RESP4);
349                 }
350
351                 /* Wait for BUSYD0END flag if busy status is detected */
352                 if (cmd->resp_type & MMC_RSP_BUSY &&
353                     status & SDMMC_STA_BUSYD0) {
354                         mask = SDMMC_STA_DTIMEOUT | SDMMC_STA_BUSYD0END;
355
356                         /* Polling status register */
357                         ret = readl_poll_timeout(plat->base + SDMMC_STA,
358                                                  status, status & mask,
359                                                  SDMMC_BUSYD0END_TIMEOUT_US);
360
361                         if (ret < 0) {
362                                 dev_dbg(dev, "timeout reading SDMMC_STA\n");
363                                 ctx->dpsm_abort = true;
364                                 return ret;
365                         }
366
367                         if (status & SDMMC_STA_DTIMEOUT) {
368                                 dev_dbg(dev,
369                                         "error SDMMC_STA_DTIMEOUT (0x%x)\n",
370                                         status);
371                                 ctx->dpsm_abort = true;
372                                 return -ETIMEDOUT;
373                         }
374                 }
375         }
376
377         return 0;
378 }
379
380 static int stm32_sdmmc2_end_data(struct udevice *dev,
381                                  struct mmc_cmd *cmd,
382                                  struct mmc_data *data,
383                                  struct stm32_sdmmc2_ctx *ctx)
384 {
385         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
386         u32 mask = SDMMC_STA_DCRCFAIL | SDMMC_STA_DTIMEOUT |
387                    SDMMC_STA_IDMATE | SDMMC_STA_DATAEND;
388         u32 status;
389
390         if (data->flags & MMC_DATA_READ)
391                 mask |= SDMMC_STA_RXOVERR;
392         else
393                 mask |= SDMMC_STA_TXUNDERR;
394
395         status = readl(plat->base + SDMMC_STA);
396         while (!(status & mask))
397                 status = readl(plat->base + SDMMC_STA);
398
399         /*
400          * Need invalidate the dcache again to avoid any
401          * cache-refill during the DMA operations (pre-fetching)
402          */
403         if (data->flags & MMC_DATA_READ)
404                 invalidate_dcache_range(ctx->cache_start, ctx->cache_end);
405
406         if (status & SDMMC_STA_DCRCFAIL) {
407                 dev_dbg(dev, "error SDMMC_STA_DCRCFAIL (0x%x) for cmd %d\n",
408                         status, cmd->cmdidx);
409                 if (readl(plat->base + SDMMC_DCOUNT))
410                         ctx->dpsm_abort = true;
411                 return -EILSEQ;
412         }
413
414         if (status & SDMMC_STA_DTIMEOUT) {
415                 dev_dbg(dev, "error SDMMC_STA_DTIMEOUT (0x%x) for cmd %d\n",
416                         status, cmd->cmdidx);
417                 ctx->dpsm_abort = true;
418                 return -ETIMEDOUT;
419         }
420
421         if (status & SDMMC_STA_TXUNDERR) {
422                 dev_dbg(dev, "error SDMMC_STA_TXUNDERR (0x%x) for cmd %d\n",
423                         status, cmd->cmdidx);
424                 ctx->dpsm_abort = true;
425                 return -EIO;
426         }
427
428         if (status & SDMMC_STA_RXOVERR) {
429                 dev_dbg(dev, "error SDMMC_STA_RXOVERR (0x%x) for cmd %d\n",
430                         status, cmd->cmdidx);
431                 ctx->dpsm_abort = true;
432                 return -EIO;
433         }
434
435         if (status & SDMMC_STA_IDMATE) {
436                 dev_dbg(dev, "error SDMMC_STA_IDMATE (0x%x) for cmd %d\n",
437                         status, cmd->cmdidx);
438                 ctx->dpsm_abort = true;
439                 return -EIO;
440         }
441
442         return 0;
443 }
444
445 static int stm32_sdmmc2_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
446                                  struct mmc_data *data)
447 {
448         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
449         struct stm32_sdmmc2_ctx ctx;
450         u32 cmdat = data ? SDMMC_CMD_CMDTRANS : 0;
451         int ret, retry = 3;
452
453         schedule();
454
455 retry_cmd:
456         ctx.data_length = 0;
457         ctx.dpsm_abort = false;
458
459         if (data) {
460                 ctx.data_length = data->blocks * data->blocksize;
461                 stm32_sdmmc2_start_data(dev, data, &ctx);
462         }
463
464         stm32_sdmmc2_start_cmd(dev, cmd, cmdat, &ctx);
465
466         dev_dbg(dev, "send cmd %d data: 0x%x @ 0x%x\n",
467                 cmd->cmdidx, data ? ctx.data_length : 0, (unsigned int)data);
468
469         ret = stm32_sdmmc2_end_cmd(dev, cmd, &ctx);
470
471         if (data && !ret)
472                 ret = stm32_sdmmc2_end_data(dev, cmd, data, &ctx);
473
474         /* Clear flags */
475         writel(SDMMC_ICR_STATIC_FLAGS, plat->base + SDMMC_ICR);
476         if (data)
477                 writel(0x0, plat->base + SDMMC_IDMACTRL);
478
479         /*
480          * To stop Data Path State Machine, a stop_transmission command
481          * shall be send on cmd or data errors.
482          */
483         if (ctx.dpsm_abort && (cmd->cmdidx != MMC_CMD_STOP_TRANSMISSION)) {
484                 struct mmc_cmd stop_cmd;
485
486                 stop_cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
487                 stop_cmd.cmdarg = 0;
488                 stop_cmd.resp_type = MMC_RSP_R1b;
489
490                 dev_dbg(dev, "send STOP command to abort dpsm treatments\n");
491
492                 ctx.data_length = 0;
493
494                 stm32_sdmmc2_start_cmd(dev, &stop_cmd,
495                                        SDMMC_CMD_CMDSTOP, &ctx);
496                 stm32_sdmmc2_end_cmd(dev, &stop_cmd, &ctx);
497
498                 writel(SDMMC_ICR_STATIC_FLAGS, plat->base + SDMMC_ICR);
499         }
500
501         if ((ret != -ETIMEDOUT) && (ret != 0) && retry) {
502                 dev_err(dev, "cmd %d failed, retrying ...\n", cmd->cmdidx);
503                 retry--;
504                 goto retry_cmd;
505         }
506
507         dev_dbg(dev, "end for CMD %d, ret = %d\n", cmd->cmdidx, ret);
508
509         return ret;
510 }
511
512 /*
513  * Reset the SDMMC with the RCC.SDMMCxRST register bit.
514  * This will reset the SDMMC to the reset state and the CPSM and DPSM
515  * to the Idle state. SDMMC is disabled, Signals Hiz.
516  */
517 static void stm32_sdmmc2_reset(struct stm32_sdmmc2_plat *plat)
518 {
519         if (reset_valid(&plat->reset_ctl)) {
520                 /* Reset */
521                 reset_assert(&plat->reset_ctl);
522                 udelay(2);
523                 reset_deassert(&plat->reset_ctl);
524         }
525
526         /* init the needed SDMMC register after reset */
527         writel(plat->pwr_reg_msk, plat->base + SDMMC_POWER);
528 }
529
530 /*
531  * Set the SDMMC in power-cycle state.
532  * This will make that the SDMMC_D[7:0],
533  * SDMMC_CMD and SDMMC_CK are driven low, to prevent the card from being
534  * supplied through the signal lines.
535  */
536 static void stm32_sdmmc2_pwrcycle(struct stm32_sdmmc2_plat *plat)
537 {
538         if ((readl(plat->base + SDMMC_POWER) & SDMMC_POWER_PWRCTRL_MASK) ==
539             SDMMC_POWER_PWRCTRL_CYCLE)
540                 return;
541
542         stm32_sdmmc2_reset(plat);
543 }
544
545 /*
546  * set the SDMMC state Power-on: the card is clocked
547  * manage the SDMMC state control:
548  * Reset => Power-Cycle => Power-Off => Power
549  *    PWRCTRL=10     PWCTRL=00    PWCTRL=11
550  */
551 static void stm32_sdmmc2_pwron(struct stm32_sdmmc2_plat *plat)
552 {
553         u32 pwrctrl =
554                 readl(plat->base + SDMMC_POWER) &  SDMMC_POWER_PWRCTRL_MASK;
555
556         if (pwrctrl == SDMMC_POWER_PWRCTRL_ON)
557                 return;
558
559         /* warning: same PWRCTRL value after reset and for power-off state
560          * it is the reset state here = the only managed by the driver
561          */
562         if (pwrctrl == SDMMC_POWER_PWRCTRL_OFF) {
563                 writel(SDMMC_POWER_PWRCTRL_CYCLE | plat->pwr_reg_msk,
564                        plat->base + SDMMC_POWER);
565         }
566
567         /*
568          * the remaining case is SDMMC_POWER_PWRCTRL_CYCLE
569          * switch to Power-Off state: SDMCC disable, signals drive 1
570          */
571         writel(SDMMC_POWER_PWRCTRL_OFF | plat->pwr_reg_msk,
572                plat->base + SDMMC_POWER);
573
574         /* After the 1ms delay set the SDMMC to power-on */
575         mdelay(1);
576         writel(SDMMC_POWER_PWRCTRL_ON | plat->pwr_reg_msk,
577                plat->base + SDMMC_POWER);
578
579         /* during the first 74 SDMMC_CK cycles the SDMMC is still disabled. */
580
581 #if CONFIG_IS_ENABLED(DM_REGULATOR)
582         if (plat->mmc.vqmmc_supply && !plat->vqmmc_enabled) {
583                 if (regulator_set_enable_if_allowed(plat->mmc.vqmmc_supply, true))
584                         dev_dbg(plat->mmc.dev, "failed to enable vqmmc-supply\n");
585                 else
586                         plat->vqmmc_enabled = true;
587         }
588 #endif
589 }
590
591 #define IS_RISING_EDGE(reg) (reg & SDMMC_CLKCR_NEGEDGE ? 0 : 1)
592 static int stm32_sdmmc2_set_ios(struct udevice *dev)
593 {
594         struct mmc *mmc = mmc_get_mmc_dev(dev);
595         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
596         u32 desired = mmc->clock;
597         u32 sys_clock = clk_get_rate(&plat->clk);
598         u32 clk = 0;
599
600         dev_dbg(dev, "bus_with = %d, clock = %d\n",
601                 mmc->bus_width, mmc->clock);
602
603         if (mmc->clk_disable)
604                 stm32_sdmmc2_pwrcycle(plat);
605         else
606                 stm32_sdmmc2_pwron(plat);
607
608         /*
609          * clk_div = 0 => command and data generated on SDMMCCLK falling edge
610          * clk_div > 0 and NEGEDGE = 0 => command and data generated on
611          * SDMMCCLK rising edge
612          * clk_div > 0 and NEGEDGE = 1 => command and data generated on
613          * SDMMCCLK falling edge
614          */
615         if (desired && (sys_clock > desired || mmc->ddr_mode ||
616                         IS_RISING_EDGE(plat->clk_reg_msk))) {
617                 clk = DIV_ROUND_UP(sys_clock, 2 * desired);
618                 if (clk > SDMMC_CLKCR_CLKDIV_MAX)
619                         clk = SDMMC_CLKCR_CLKDIV_MAX;
620         }
621
622         if (mmc->ddr_mode)
623                 clk |= SDMMC_CLKCR_DDR;
624
625         if (mmc->bus_width == 4)
626                 clk |= SDMMC_CLKCR_WIDBUS_4;
627         if (mmc->bus_width == 8)
628                 clk |= SDMMC_CLKCR_WIDBUS_8;
629
630         writel(clk | plat->clk_reg_msk | SDMMC_CLKCR_HWFC_EN,
631                plat->base + SDMMC_CLKCR);
632
633         return 0;
634 }
635
636 static int stm32_sdmmc2_getcd(struct udevice *dev)
637 {
638         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
639
640         dev_dbg(dev, "%s called\n", __func__);
641
642         if (dm_gpio_is_valid(&plat->cd_gpio))
643                 return dm_gpio_get_value(&plat->cd_gpio);
644
645         return 1;
646 }
647
648 static int stm32_sdmmc2_host_power_cycle(struct udevice *dev)
649 {
650         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
651
652         writel(SDMMC_POWER_PWRCTRL_CYCLE | plat->pwr_reg_msk,
653                plat->base + SDMMC_POWER);
654
655         return 0;
656 }
657
658 static const struct dm_mmc_ops stm32_sdmmc2_ops = {
659         .send_cmd = stm32_sdmmc2_send_cmd,
660         .set_ios = stm32_sdmmc2_set_ios,
661         .get_cd = stm32_sdmmc2_getcd,
662         .host_power_cycle = stm32_sdmmc2_host_power_cycle,
663 };
664
665 static int stm32_sdmmc2_of_to_plat(struct udevice *dev)
666 {
667         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
668         struct mmc_config *cfg = &plat->cfg;
669         int ret;
670
671         plat->base = dev_read_addr(dev);
672         if (plat->base == FDT_ADDR_T_NONE)
673                 return -EINVAL;
674
675         if (dev_read_bool(dev, "st,neg-edge"))
676                 plat->clk_reg_msk |= SDMMC_CLKCR_NEGEDGE;
677         if (dev_read_bool(dev, "st,sig-dir"))
678                 plat->pwr_reg_msk |= SDMMC_POWER_DIRPOL;
679         if (dev_read_bool(dev, "st,use-ckin"))
680                 plat->clk_reg_msk |= SDMMC_CLKCR_SELCLKRX_CKIN;
681
682         cfg->f_min = 400000;
683         cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
684         cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
685         cfg->name = "STM32 SD/MMC";
686         cfg->host_caps = 0;
687         cfg->f_max = 52000000;
688         ret = mmc_of_parse(dev, cfg);
689         if (ret)
690                 return ret;
691
692         cfg->host_caps &= ~(UHS_CAPS | MMC_MODE_HS200 | MMC_MODE_HS400 | MMC_MODE_HS400_ES);
693
694         ret = clk_get_by_index(dev, 0, &plat->clk);
695         if (ret)
696                 return ret;
697
698         ret = reset_get_by_index(dev, 0, &plat->reset_ctl);
699         if (ret)
700                 dev_dbg(dev, "No reset provided\n");
701
702         gpio_request_by_name(dev, "cd-gpios", 0, &plat->cd_gpio,
703                              GPIOD_IS_IN);
704
705         return 0;
706 }
707
708 static int stm32_sdmmc2_probe_level_translator(struct udevice *dev)
709 {
710         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
711         struct gpio_desc cmd_gpio;
712         struct gpio_desc ck_gpio;
713         struct gpio_desc ckin_gpio;
714         int clk_hi, clk_lo, ret;
715
716         ret = gpio_request_by_name(dev, "st,cmd-gpios", 0, &cmd_gpio,
717                                    GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
718         if (ret)
719                 goto exit_cmd;
720
721         ret = gpio_request_by_name(dev, "st,ck-gpios", 0, &ck_gpio,
722                                    GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
723         if (ret)
724                 goto exit_ck;
725
726         ret = gpio_request_by_name(dev, "st,ckin-gpios", 0, &ckin_gpio,
727                                    GPIOD_IS_IN);
728         if (ret)
729                 goto exit_ckin;
730
731         /* All GPIOs are valid, test whether level translator works */
732
733         /* Sample CKIN */
734         clk_hi = !!dm_gpio_get_value(&ckin_gpio);
735
736         /* Set CK low */
737         dm_gpio_set_value(&ck_gpio, 0);
738
739         /* Sample CKIN */
740         clk_lo = !!dm_gpio_get_value(&ckin_gpio);
741
742         /* Tristate all */
743         dm_gpio_set_dir_flags(&cmd_gpio, GPIOD_IS_IN);
744         dm_gpio_set_dir_flags(&ck_gpio, GPIOD_IS_IN);
745
746         /* Level translator is present if CK signal is propagated to CKIN */
747         if (!clk_hi || clk_lo)
748                 plat->clk_reg_msk &= ~SDMMC_CLKCR_SELCLKRX_CKIN;
749
750         dm_gpio_free(dev, &ckin_gpio);
751
752 exit_ckin:
753         dm_gpio_free(dev, &ck_gpio);
754 exit_ck:
755         dm_gpio_free(dev, &cmd_gpio);
756 exit_cmd:
757         pinctrl_select_state(dev, "default");
758
759         return 0;
760 }
761
762 static int stm32_sdmmc2_probe(struct udevice *dev)
763 {
764         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
765         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
766         int ret;
767
768         ret = clk_enable(&plat->clk);
769         if (ret)
770                 return ret;
771
772         upriv->mmc = &plat->mmc;
773
774         if (plat->clk_reg_msk & SDMMC_CLKCR_SELCLKRX_CKIN)
775                 stm32_sdmmc2_probe_level_translator(dev);
776
777         /* SDMMC init */
778         stm32_sdmmc2_reset(plat);
779
780         return 0;
781 }
782
783 static int stm32_sdmmc2_bind(struct udevice *dev)
784 {
785         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
786
787         return mmc_bind(dev, &plat->mmc, &plat->cfg);
788 }
789
790 static const struct udevice_id stm32_sdmmc2_ids[] = {
791         { .compatible = "st,stm32-sdmmc2" },
792         { }
793 };
794
795 U_BOOT_DRIVER(stm32_sdmmc2) = {
796         .name = "stm32_sdmmc2",
797         .id = UCLASS_MMC,
798         .of_match = stm32_sdmmc2_ids,
799         .ops = &stm32_sdmmc2_ops,
800         .probe = stm32_sdmmc2_probe,
801         .bind = stm32_sdmmc2_bind,
802         .of_to_plat = stm32_sdmmc2_of_to_plat,
803         .plat_auto      = sizeof(struct stm32_sdmmc2_plat),
804 };
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