1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
4 * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
13 #include <linux/libfdt.h>
18 #include <linux/iopoll.h>
21 struct stm32_sdmmc2_plat
{
22 struct mmc_config cfg
;
26 struct stm32_sdmmc2_priv
{
29 struct reset_ctl reset_ctl
;
30 struct gpio_desc cd_gpio
;
35 struct stm32_sdmmc2_ctx
{
42 /* SDMMC REGISTERS OFFSET */
43 #define SDMMC_POWER 0x00 /* SDMMC power control */
44 #define SDMMC_CLKCR 0x04 /* SDMMC clock control */
45 #define SDMMC_ARG 0x08 /* SDMMC argument */
46 #define SDMMC_CMD 0x0C /* SDMMC command */
47 #define SDMMC_RESP1 0x14 /* SDMMC response 1 */
48 #define SDMMC_RESP2 0x18 /* SDMMC response 2 */
49 #define SDMMC_RESP3 0x1C /* SDMMC response 3 */
50 #define SDMMC_RESP4 0x20 /* SDMMC response 4 */
51 #define SDMMC_DTIMER 0x24 /* SDMMC data timer */
52 #define SDMMC_DLEN 0x28 /* SDMMC data length */
53 #define SDMMC_DCTRL 0x2C /* SDMMC data control */
54 #define SDMMC_DCOUNT 0x30 /* SDMMC data counter */
55 #define SDMMC_STA 0x34 /* SDMMC status */
56 #define SDMMC_ICR 0x38 /* SDMMC interrupt clear */
57 #define SDMMC_MASK 0x3C /* SDMMC mask */
58 #define SDMMC_IDMACTRL 0x50 /* SDMMC DMA control */
59 #define SDMMC_IDMABASE0 0x58 /* SDMMC DMA buffer 0 base address */
61 /* SDMMC_POWER register */
62 #define SDMMC_POWER_PWRCTRL_MASK GENMASK(1, 0)
63 #define SDMMC_POWER_PWRCTRL_OFF 0
64 #define SDMMC_POWER_PWRCTRL_CYCLE 2
65 #define SDMMC_POWER_PWRCTRL_ON 3
66 #define SDMMC_POWER_VSWITCH BIT(2)
67 #define SDMMC_POWER_VSWITCHEN BIT(3)
68 #define SDMMC_POWER_DIRPOL BIT(4)
70 /* SDMMC_CLKCR register */
71 #define SDMMC_CLKCR_CLKDIV GENMASK(9, 0)
72 #define SDMMC_CLKCR_CLKDIV_MAX SDMMC_CLKCR_CLKDIV
73 #define SDMMC_CLKCR_PWRSAV BIT(12)
74 #define SDMMC_CLKCR_WIDBUS_4 BIT(14)
75 #define SDMMC_CLKCR_WIDBUS_8 BIT(15)
76 #define SDMMC_CLKCR_NEGEDGE BIT(16)
77 #define SDMMC_CLKCR_HWFC_EN BIT(17)
78 #define SDMMC_CLKCR_DDR BIT(18)
79 #define SDMMC_CLKCR_BUSSPEED BIT(19)
80 #define SDMMC_CLKCR_SELCLKRX_MASK GENMASK(21, 20)
81 #define SDMMC_CLKCR_SELCLKRX_CK 0
82 #define SDMMC_CLKCR_SELCLKRX_CKIN BIT(20)
83 #define SDMMC_CLKCR_SELCLKRX_FBCK BIT(21)
85 /* SDMMC_CMD register */
86 #define SDMMC_CMD_CMDINDEX GENMASK(5, 0)
87 #define SDMMC_CMD_CMDTRANS BIT(6)
88 #define SDMMC_CMD_CMDSTOP BIT(7)
89 #define SDMMC_CMD_WAITRESP GENMASK(9, 8)
90 #define SDMMC_CMD_WAITRESP_0 BIT(8)
91 #define SDMMC_CMD_WAITRESP_1 BIT(9)
92 #define SDMMC_CMD_WAITINT BIT(10)
93 #define SDMMC_CMD_WAITPEND BIT(11)
94 #define SDMMC_CMD_CPSMEN BIT(12)
95 #define SDMMC_CMD_DTHOLD BIT(13)
96 #define SDMMC_CMD_BOOTMODE BIT(14)
97 #define SDMMC_CMD_BOOTEN BIT(15)
98 #define SDMMC_CMD_CMDSUSPEND BIT(16)
100 /* SDMMC_DCTRL register */
101 #define SDMMC_DCTRL_DTEN BIT(0)
102 #define SDMMC_DCTRL_DTDIR BIT(1)
103 #define SDMMC_DCTRL_DTMODE GENMASK(3, 2)
104 #define SDMMC_DCTRL_DBLOCKSIZE GENMASK(7, 4)
105 #define SDMMC_DCTRL_DBLOCKSIZE_SHIFT 4
106 #define SDMMC_DCTRL_RWSTART BIT(8)
107 #define SDMMC_DCTRL_RWSTOP BIT(9)
108 #define SDMMC_DCTRL_RWMOD BIT(10)
109 #define SDMMC_DCTRL_SDMMCEN BIT(11)
110 #define SDMMC_DCTRL_BOOTACKEN BIT(12)
111 #define SDMMC_DCTRL_FIFORST BIT(13)
113 /* SDMMC_STA register */
114 #define SDMMC_STA_CCRCFAIL BIT(0)
115 #define SDMMC_STA_DCRCFAIL BIT(1)
116 #define SDMMC_STA_CTIMEOUT BIT(2)
117 #define SDMMC_STA_DTIMEOUT BIT(3)
118 #define SDMMC_STA_TXUNDERR BIT(4)
119 #define SDMMC_STA_RXOVERR BIT(5)
120 #define SDMMC_STA_CMDREND BIT(6)
121 #define SDMMC_STA_CMDSENT BIT(7)
122 #define SDMMC_STA_DATAEND BIT(8)
123 #define SDMMC_STA_DHOLD BIT(9)
124 #define SDMMC_STA_DBCKEND BIT(10)
125 #define SDMMC_STA_DABORT BIT(11)
126 #define SDMMC_STA_DPSMACT BIT(12)
127 #define SDMMC_STA_CPSMACT BIT(13)
128 #define SDMMC_STA_TXFIFOHE BIT(14)
129 #define SDMMC_STA_RXFIFOHF BIT(15)
130 #define SDMMC_STA_TXFIFOF BIT(16)
131 #define SDMMC_STA_RXFIFOF BIT(17)
132 #define SDMMC_STA_TXFIFOE BIT(18)
133 #define SDMMC_STA_RXFIFOE BIT(19)
134 #define SDMMC_STA_BUSYD0 BIT(20)
135 #define SDMMC_STA_BUSYD0END BIT(21)
136 #define SDMMC_STA_SDMMCIT BIT(22)
137 #define SDMMC_STA_ACKFAIL BIT(23)
138 #define SDMMC_STA_ACKTIMEOUT BIT(24)
139 #define SDMMC_STA_VSWEND BIT(25)
140 #define SDMMC_STA_CKSTOP BIT(26)
141 #define SDMMC_STA_IDMATE BIT(27)
142 #define SDMMC_STA_IDMABTC BIT(28)
144 /* SDMMC_ICR register */
145 #define SDMMC_ICR_CCRCFAILC BIT(0)
146 #define SDMMC_ICR_DCRCFAILC BIT(1)
147 #define SDMMC_ICR_CTIMEOUTC BIT(2)
148 #define SDMMC_ICR_DTIMEOUTC BIT(3)
149 #define SDMMC_ICR_TXUNDERRC BIT(4)
150 #define SDMMC_ICR_RXOVERRC BIT(5)
151 #define SDMMC_ICR_CMDRENDC BIT(6)
152 #define SDMMC_ICR_CMDSENTC BIT(7)
153 #define SDMMC_ICR_DATAENDC BIT(8)
154 #define SDMMC_ICR_DHOLDC BIT(9)
155 #define SDMMC_ICR_DBCKENDC BIT(10)
156 #define SDMMC_ICR_DABORTC BIT(11)
157 #define SDMMC_ICR_BUSYD0ENDC BIT(21)
158 #define SDMMC_ICR_SDMMCITC BIT(22)
159 #define SDMMC_ICR_ACKFAILC BIT(23)
160 #define SDMMC_ICR_ACKTIMEOUTC BIT(24)
161 #define SDMMC_ICR_VSWENDC BIT(25)
162 #define SDMMC_ICR_CKSTOPC BIT(26)
163 #define SDMMC_ICR_IDMATEC BIT(27)
164 #define SDMMC_ICR_IDMABTCC BIT(28)
165 #define SDMMC_ICR_STATIC_FLAGS ((GENMASK(28, 21)) | (GENMASK(11, 0)))
167 /* SDMMC_MASK register */
168 #define SDMMC_MASK_CCRCFAILIE BIT(0)
169 #define SDMMC_MASK_DCRCFAILIE BIT(1)
170 #define SDMMC_MASK_CTIMEOUTIE BIT(2)
171 #define SDMMC_MASK_DTIMEOUTIE BIT(3)
172 #define SDMMC_MASK_TXUNDERRIE BIT(4)
173 #define SDMMC_MASK_RXOVERRIE BIT(5)
174 #define SDMMC_MASK_CMDRENDIE BIT(6)
175 #define SDMMC_MASK_CMDSENTIE BIT(7)
176 #define SDMMC_MASK_DATAENDIE BIT(8)
177 #define SDMMC_MASK_DHOLDIE BIT(9)
178 #define SDMMC_MASK_DBCKENDIE BIT(10)
179 #define SDMMC_MASK_DABORTIE BIT(11)
180 #define SDMMC_MASK_TXFIFOHEIE BIT(14)
181 #define SDMMC_MASK_RXFIFOHFIE BIT(15)
182 #define SDMMC_MASK_RXFIFOFIE BIT(17)
183 #define SDMMC_MASK_TXFIFOEIE BIT(18)
184 #define SDMMC_MASK_BUSYD0ENDIE BIT(21)
185 #define SDMMC_MASK_SDMMCITIE BIT(22)
186 #define SDMMC_MASK_ACKFAILIE BIT(23)
187 #define SDMMC_MASK_ACKTIMEOUTIE BIT(24)
188 #define SDMMC_MASK_VSWENDIE BIT(25)
189 #define SDMMC_MASK_CKSTOPIE BIT(26)
190 #define SDMMC_MASK_IDMABTCIE BIT(28)
192 /* SDMMC_IDMACTRL register */
193 #define SDMMC_IDMACTRL_IDMAEN BIT(0)
195 #define SDMMC_CMD_TIMEOUT 0xFFFFFFFF
196 #define SDMMC_BUSYD0END_TIMEOUT_US 2000000
198 static void stm32_sdmmc2_start_data(struct stm32_sdmmc2_priv
*priv
,
199 struct mmc_data
*data
,
200 struct stm32_sdmmc2_ctx
*ctx
)
202 u32 data_ctrl
, idmabase0
;
204 /* Configure the SDMMC DPSM (Data Path State Machine) */
205 data_ctrl
= (__ilog2(data
->blocksize
) <<
206 SDMMC_DCTRL_DBLOCKSIZE_SHIFT
) &
207 SDMMC_DCTRL_DBLOCKSIZE
;
209 if (data
->flags
& MMC_DATA_READ
) {
210 data_ctrl
|= SDMMC_DCTRL_DTDIR
;
211 idmabase0
= (u32
)data
->dest
;
213 idmabase0
= (u32
)data
->src
;
216 /* Set the SDMMC DataLength value */
217 writel(ctx
->data_length
, priv
->base
+ SDMMC_DLEN
);
219 /* Write to SDMMC DCTRL */
220 writel(data_ctrl
, priv
->base
+ SDMMC_DCTRL
);
223 ctx
->cache_start
= rounddown(idmabase0
, ARCH_DMA_MINALIGN
);
224 ctx
->cache_end
= roundup(idmabase0
+ ctx
->data_length
,
228 * Flush data cache before DMA start (clean and invalidate)
229 * Clean also needed for read
230 * Avoid issue on buffer not cached-aligned
232 flush_dcache_range(ctx
->cache_start
, ctx
->cache_end
);
234 /* Enable internal DMA */
235 writel(idmabase0
, priv
->base
+ SDMMC_IDMABASE0
);
236 writel(SDMMC_IDMACTRL_IDMAEN
, priv
->base
+ SDMMC_IDMACTRL
);
239 static void stm32_sdmmc2_start_cmd(struct stm32_sdmmc2_priv
*priv
,
240 struct mmc_cmd
*cmd
, u32 cmd_param
,
241 struct stm32_sdmmc2_ctx
*ctx
)
245 if (readl(priv
->base
+ SDMMC_CMD
) & SDMMC_CMD_CPSMEN
)
246 writel(0, priv
->base
+ SDMMC_CMD
);
248 cmd_param
|= cmd
->cmdidx
| SDMMC_CMD_CPSMEN
;
249 if (cmd
->resp_type
& MMC_RSP_PRESENT
) {
250 if (cmd
->resp_type
& MMC_RSP_136
)
251 cmd_param
|= SDMMC_CMD_WAITRESP
;
252 else if (cmd
->resp_type
& MMC_RSP_CRC
)
253 cmd_param
|= SDMMC_CMD_WAITRESP_0
;
255 cmd_param
|= SDMMC_CMD_WAITRESP_1
;
259 * SDMMC_DTIME must be set in two case:
260 * - on data transfert.
262 * If not done or too short, the dtimeout flag occurs and DPSM stays
263 * enabled/busy and waits for abort (stop transmission cmd).
264 * Next data command is not possible whereas DPSM is activated.
266 if (ctx
->data_length
) {
267 timeout
= SDMMC_CMD_TIMEOUT
;
269 writel(0, priv
->base
+ SDMMC_DCTRL
);
271 if (cmd
->resp_type
& MMC_RSP_BUSY
)
272 timeout
= SDMMC_CMD_TIMEOUT
;
275 /* Set the SDMMC Data TimeOut value */
276 writel(timeout
, priv
->base
+ SDMMC_DTIMER
);
279 writel(SDMMC_ICR_STATIC_FLAGS
, priv
->base
+ SDMMC_ICR
);
281 /* Set SDMMC argument value */
282 writel(cmd
->cmdarg
, priv
->base
+ SDMMC_ARG
);
284 /* Set SDMMC command parameters */
285 writel(cmd_param
, priv
->base
+ SDMMC_CMD
);
288 static int stm32_sdmmc2_end_cmd(struct stm32_sdmmc2_priv
*priv
,
290 struct stm32_sdmmc2_ctx
*ctx
)
292 u32 mask
= SDMMC_STA_CTIMEOUT
;
296 if (cmd
->resp_type
& MMC_RSP_PRESENT
) {
297 mask
|= SDMMC_STA_CMDREND
;
298 if (cmd
->resp_type
& MMC_RSP_CRC
)
299 mask
|= SDMMC_STA_CCRCFAIL
;
301 mask
|= SDMMC_STA_CMDSENT
;
304 /* Polling status register */
305 ret
= readl_poll_timeout(priv
->base
+ SDMMC_STA
, status
, status
& mask
,
309 debug("%s: timeout reading SDMMC_STA register\n", __func__
);
310 ctx
->dpsm_abort
= true;
315 if (status
& SDMMC_STA_CTIMEOUT
) {
316 debug("%s: error SDMMC_STA_CTIMEOUT (0x%x) for cmd %d\n",
317 __func__
, status
, cmd
->cmdidx
);
318 ctx
->dpsm_abort
= true;
322 if (status
& SDMMC_STA_CCRCFAIL
&& cmd
->resp_type
& MMC_RSP_CRC
) {
323 debug("%s: error SDMMC_STA_CCRCFAIL (0x%x) for cmd %d\n",
324 __func__
, status
, cmd
->cmdidx
);
325 ctx
->dpsm_abort
= true;
329 if (status
& SDMMC_STA_CMDREND
&& cmd
->resp_type
& MMC_RSP_PRESENT
) {
330 cmd
->response
[0] = readl(priv
->base
+ SDMMC_RESP1
);
331 if (cmd
->resp_type
& MMC_RSP_136
) {
332 cmd
->response
[1] = readl(priv
->base
+ SDMMC_RESP2
);
333 cmd
->response
[2] = readl(priv
->base
+ SDMMC_RESP3
);
334 cmd
->response
[3] = readl(priv
->base
+ SDMMC_RESP4
);
337 /* Wait for BUSYD0END flag if busy status is detected */
338 if (cmd
->resp_type
& MMC_RSP_BUSY
&&
339 status
& SDMMC_STA_BUSYD0
) {
340 mask
= SDMMC_STA_DTIMEOUT
| SDMMC_STA_BUSYD0END
;
342 /* Polling status register */
343 ret
= readl_poll_timeout(priv
->base
+ SDMMC_STA
,
344 status
, status
& mask
,
345 SDMMC_BUSYD0END_TIMEOUT_US
);
348 debug("%s: timeout reading SDMMC_STA\n",
350 ctx
->dpsm_abort
= true;
354 if (status
& SDMMC_STA_DTIMEOUT
) {
355 debug("%s: error SDMMC_STA_DTIMEOUT (0x%x)\n",
357 ctx
->dpsm_abort
= true;
366 static int stm32_sdmmc2_end_data(struct stm32_sdmmc2_priv
*priv
,
368 struct mmc_data
*data
,
369 struct stm32_sdmmc2_ctx
*ctx
)
371 u32 mask
= SDMMC_STA_DCRCFAIL
| SDMMC_STA_DTIMEOUT
|
372 SDMMC_STA_IDMATE
| SDMMC_STA_DATAEND
;
375 if (data
->flags
& MMC_DATA_READ
)
376 mask
|= SDMMC_STA_RXOVERR
;
378 mask
|= SDMMC_STA_TXUNDERR
;
380 status
= readl(priv
->base
+ SDMMC_STA
);
381 while (!(status
& mask
))
382 status
= readl(priv
->base
+ SDMMC_STA
);
385 * Need invalidate the dcache again to avoid any
386 * cache-refill during the DMA operations (pre-fetching)
388 if (data
->flags
& MMC_DATA_READ
)
389 invalidate_dcache_range(ctx
->cache_start
, ctx
->cache_end
);
391 if (status
& SDMMC_STA_DCRCFAIL
) {
392 debug("%s: error SDMMC_STA_DCRCFAIL (0x%x) for cmd %d\n",
393 __func__
, status
, cmd
->cmdidx
);
394 if (readl(priv
->base
+ SDMMC_DCOUNT
))
395 ctx
->dpsm_abort
= true;
399 if (status
& SDMMC_STA_DTIMEOUT
) {
400 debug("%s: error SDMMC_STA_DTIMEOUT (0x%x) for cmd %d\n",
401 __func__
, status
, cmd
->cmdidx
);
402 ctx
->dpsm_abort
= true;
406 if (status
& SDMMC_STA_TXUNDERR
) {
407 debug("%s: error SDMMC_STA_TXUNDERR (0x%x) for cmd %d\n",
408 __func__
, status
, cmd
->cmdidx
);
409 ctx
->dpsm_abort
= true;
413 if (status
& SDMMC_STA_RXOVERR
) {
414 debug("%s: error SDMMC_STA_RXOVERR (0x%x) for cmd %d\n",
415 __func__
, status
, cmd
->cmdidx
);
416 ctx
->dpsm_abort
= true;
420 if (status
& SDMMC_STA_IDMATE
) {
421 debug("%s: error SDMMC_STA_IDMATE (0x%x) for cmd %d\n",
422 __func__
, status
, cmd
->cmdidx
);
423 ctx
->dpsm_abort
= true;
430 static int stm32_sdmmc2_send_cmd(struct udevice
*dev
, struct mmc_cmd
*cmd
,
431 struct mmc_data
*data
)
433 struct stm32_sdmmc2_priv
*priv
= dev_get_priv(dev
);
434 struct stm32_sdmmc2_ctx ctx
;
435 u32 cmdat
= data
? SDMMC_CMD_CMDTRANS
: 0;
442 ctx
.dpsm_abort
= false;
445 ctx
.data_length
= data
->blocks
* data
->blocksize
;
446 stm32_sdmmc2_start_data(priv
, data
, &ctx
);
449 stm32_sdmmc2_start_cmd(priv
, cmd
, cmdat
, &ctx
);
451 debug("%s: send cmd %d data: 0x%x @ 0x%x\n",
452 __func__
, cmd
->cmdidx
,
453 data
? ctx
.data_length
: 0, (unsigned int)data
);
455 ret
= stm32_sdmmc2_end_cmd(priv
, cmd
, &ctx
);
458 ret
= stm32_sdmmc2_end_data(priv
, cmd
, data
, &ctx
);
461 writel(SDMMC_ICR_STATIC_FLAGS
, priv
->base
+ SDMMC_ICR
);
463 writel(0x0, priv
->base
+ SDMMC_IDMACTRL
);
466 * To stop Data Path State Machine, a stop_transmission command
467 * shall be send on cmd or data errors.
469 if (ctx
.dpsm_abort
&& (cmd
->cmdidx
!= MMC_CMD_STOP_TRANSMISSION
)) {
470 struct mmc_cmd stop_cmd
;
472 stop_cmd
.cmdidx
= MMC_CMD_STOP_TRANSMISSION
;
474 stop_cmd
.resp_type
= MMC_RSP_R1b
;
476 debug("%s: send STOP command to abort dpsm treatments\n",
481 stm32_sdmmc2_start_cmd(priv
, &stop_cmd
,
482 SDMMC_CMD_CMDSTOP
, &ctx
);
483 stm32_sdmmc2_end_cmd(priv
, &stop_cmd
, &ctx
);
485 writel(SDMMC_ICR_STATIC_FLAGS
, priv
->base
+ SDMMC_ICR
);
488 if ((ret
!= -ETIMEDOUT
) && (ret
!= 0) && retry
) {
489 printf("%s: cmd %d failed, retrying ...\n",
490 __func__
, cmd
->cmdidx
);
495 debug("%s: end for CMD %d, ret = %d\n", __func__
, cmd
->cmdidx
, ret
);
501 * Reset the SDMMC with the RCC.SDMMCxRST register bit.
502 * This will reset the SDMMC to the reset state and the CPSM and DPSM
503 * to the Idle state. SDMMC is disabled, Signals Hiz.
505 static void stm32_sdmmc2_reset(struct stm32_sdmmc2_priv
*priv
)
508 reset_assert(&priv
->reset_ctl
);
510 reset_deassert(&priv
->reset_ctl
);
512 /* init the needed SDMMC register after reset */
513 writel(priv
->pwr_reg_msk
, priv
->base
+ SDMMC_POWER
);
517 * Set the SDMMC in power-cycle state.
518 * This will make that the SDMMC_D[7:0],
519 * SDMMC_CMD and SDMMC_CK are driven low, to prevent the card from being
520 * supplied through the signal lines.
522 static void stm32_sdmmc2_pwrcycle(struct stm32_sdmmc2_priv
*priv
)
524 if ((readl(priv
->base
+ SDMMC_POWER
) & SDMMC_POWER_PWRCTRL_MASK
) ==
525 SDMMC_POWER_PWRCTRL_CYCLE
)
528 stm32_sdmmc2_reset(priv
);
532 * set the SDMMC state Power-on: the card is clocked
533 * manage the SDMMC state control:
534 * Reset => Power-Cycle => Power-Off => Power
535 * PWRCTRL=10 PWCTRL=00 PWCTRL=11
537 static void stm32_sdmmc2_pwron(struct stm32_sdmmc2_priv
*priv
)
540 readl(priv
->base
+ SDMMC_POWER
) & SDMMC_POWER_PWRCTRL_MASK
;
542 if (pwrctrl
== SDMMC_POWER_PWRCTRL_ON
)
545 /* warning: same PWRCTRL value after reset and for power-off state
546 * it is the reset state here = the only managed by the driver
548 if (pwrctrl
== SDMMC_POWER_PWRCTRL_OFF
) {
549 writel(SDMMC_POWER_PWRCTRL_CYCLE
| priv
->pwr_reg_msk
,
550 priv
->base
+ SDMMC_POWER
);
554 * the remaining case is SDMMC_POWER_PWRCTRL_CYCLE
555 * switch to Power-Off state: SDMCC disable, signals drive 1
557 writel(SDMMC_POWER_PWRCTRL_OFF
| priv
->pwr_reg_msk
,
558 priv
->base
+ SDMMC_POWER
);
560 /* After the 1ms delay set the SDMMC to power-on */
562 writel(SDMMC_POWER_PWRCTRL_ON
| priv
->pwr_reg_msk
,
563 priv
->base
+ SDMMC_POWER
);
565 /* during the first 74 SDMMC_CK cycles the SDMMC is still disabled. */
568 #define IS_RISING_EDGE(reg) (reg & SDMMC_CLKCR_NEGEDGE ? 0 : 1)
569 static int stm32_sdmmc2_set_ios(struct udevice
*dev
)
571 struct mmc
*mmc
= mmc_get_mmc_dev(dev
);
572 struct stm32_sdmmc2_priv
*priv
= dev_get_priv(dev
);
573 u32 desired
= mmc
->clock
;
574 u32 sys_clock
= clk_get_rate(&priv
->clk
);
577 debug("%s: bus_with = %d, clock = %d\n", __func__
,
578 mmc
->bus_width
, mmc
->clock
);
580 if (mmc
->clk_disable
)
581 stm32_sdmmc2_pwrcycle(priv
);
583 stm32_sdmmc2_pwron(priv
);
586 * clk_div = 0 => command and data generated on SDMMCCLK falling edge
587 * clk_div > 0 and NEGEDGE = 0 => command and data generated on
588 * SDMMCCLK rising edge
589 * clk_div > 0 and NEGEDGE = 1 => command and data generated on
590 * SDMMCCLK falling edge
592 if (desired
&& ((sys_clock
> desired
) ||
593 IS_RISING_EDGE(priv
->clk_reg_msk
))) {
594 clk
= DIV_ROUND_UP(sys_clock
, 2 * desired
);
595 if (clk
> SDMMC_CLKCR_CLKDIV_MAX
)
596 clk
= SDMMC_CLKCR_CLKDIV_MAX
;
599 if (mmc
->bus_width
== 4)
600 clk
|= SDMMC_CLKCR_WIDBUS_4
;
601 if (mmc
->bus_width
== 8)
602 clk
|= SDMMC_CLKCR_WIDBUS_8
;
604 writel(clk
| priv
->clk_reg_msk
| SDMMC_CLKCR_HWFC_EN
,
605 priv
->base
+ SDMMC_CLKCR
);
610 static int stm32_sdmmc2_getcd(struct udevice
*dev
)
612 struct stm32_sdmmc2_priv
*priv
= dev_get_priv(dev
);
614 debug("stm32_sdmmc2_getcd called\n");
616 if (dm_gpio_is_valid(&priv
->cd_gpio
))
617 return dm_gpio_get_value(&priv
->cd_gpio
);
622 static int stm32_sdmmc2_host_power_cycle(struct udevice
*dev
)
624 struct stm32_sdmmc2_priv
*priv
= dev_get_priv(dev
);
626 writel(SDMMC_POWER_PWRCTRL_CYCLE
| priv
->pwr_reg_msk
,
627 priv
->base
+ SDMMC_POWER
);
632 static const struct dm_mmc_ops stm32_sdmmc2_ops
= {
633 .send_cmd
= stm32_sdmmc2_send_cmd
,
634 .set_ios
= stm32_sdmmc2_set_ios
,
635 .get_cd
= stm32_sdmmc2_getcd
,
636 .host_power_cycle
= stm32_sdmmc2_host_power_cycle
,
639 static int stm32_sdmmc2_probe(struct udevice
*dev
)
641 struct mmc_uclass_priv
*upriv
= dev_get_uclass_priv(dev
);
642 struct stm32_sdmmc2_plat
*plat
= dev_get_platdata(dev
);
643 struct stm32_sdmmc2_priv
*priv
= dev_get_priv(dev
);
644 struct mmc_config
*cfg
= &plat
->cfg
;
647 priv
->base
= dev_read_addr(dev
);
648 if (priv
->base
== FDT_ADDR_T_NONE
)
651 if (dev_read_bool(dev
, "st,neg-edge"))
652 priv
->clk_reg_msk
|= SDMMC_CLKCR_NEGEDGE
;
653 if (dev_read_bool(dev
, "st,sig-dir"))
654 priv
->pwr_reg_msk
|= SDMMC_POWER_DIRPOL
;
655 if (dev_read_bool(dev
, "st,use-ckin"))
656 priv
->clk_reg_msk
|= SDMMC_CLKCR_SELCLKRX_CKIN
;
658 ret
= clk_get_by_index(dev
, 0, &priv
->clk
);
662 ret
= clk_enable(&priv
->clk
);
666 ret
= reset_get_by_index(dev
, 0, &priv
->reset_ctl
);
670 gpio_request_by_name(dev
, "cd-gpios", 0, &priv
->cd_gpio
,
674 cfg
->f_max
= dev_read_u32_default(dev
, "max-frequency", 52000000);
675 cfg
->voltages
= MMC_VDD_32_33
| MMC_VDD_33_34
| MMC_VDD_165_195
;
676 cfg
->b_max
= CONFIG_SYS_MMC_MAX_BLK_COUNT
;
677 cfg
->name
= "STM32 SD/MMC";
680 if (cfg
->f_max
> 25000000)
681 cfg
->host_caps
|= MMC_MODE_HS_52MHz
| MMC_MODE_HS
;
683 switch (dev_read_u32_default(dev
, "bus-width", 1)) {
685 cfg
->host_caps
|= MMC_MODE_8BIT
;
688 cfg
->host_caps
|= MMC_MODE_4BIT
;
693 pr_err("invalid \"bus-width\" property, force to 1\n");
696 upriv
->mmc
= &plat
->mmc
;
699 stm32_sdmmc2_reset(priv
);
703 clk_disable(&priv
->clk
);
705 clk_free(&priv
->clk
);
710 static int stm32_sdmmc_bind(struct udevice
*dev
)
712 struct stm32_sdmmc2_plat
*plat
= dev_get_platdata(dev
);
714 return mmc_bind(dev
, &plat
->mmc
, &plat
->cfg
);
717 static const struct udevice_id stm32_sdmmc2_ids
[] = {
718 { .compatible
= "st,stm32-sdmmc2" },
722 U_BOOT_DRIVER(stm32_sdmmc2
) = {
723 .name
= "stm32_sdmmc2",
725 .of_match
= stm32_sdmmc2_ids
,
726 .ops
= &stm32_sdmmc2_ops
,
727 .probe
= stm32_sdmmc2_probe
,
728 .bind
= stm32_sdmmc_bind
,
729 .priv_auto_alloc_size
= sizeof(struct stm32_sdmmc2_priv
),
730 .platdata_auto_alloc_size
= sizeof(struct stm32_sdmmc2_plat
),