1 // SPDX-License-Identifier: GPL-2.0+
3 * Davinci MMC Controller Driver
5 * Copyright (C) 2010 Texas Instruments Incorporated
17 #include <asm/arch/sdmmc_defs.h>
18 #include <asm-generic/gpio.h>
19 #include <linux/delay.h>
21 #define DAVINCI_MAX_BLOCKS (32)
22 #define WATCHDOG_COUNT (100000)
24 #define get_val(addr) REG(addr)
25 #define set_val(addr, val) REG(addr) = (val)
26 #define set_bit(addr, val) set_val((addr), (get_val(addr) | (val)))
27 #define clear_bit(addr, val) set_val((addr), (get_val(addr) & ~(val)))
30 /* Davinci MMC board definitions */
31 struct davinci_mmc_priv {
32 struct davinci_mmc_regs *reg_base; /* Register base address */
33 uint input_clk; /* Input clock to MMC controller */
34 struct gpio_desc cd_gpio; /* Card Detect GPIO */
35 struct gpio_desc wp_gpio; /* Write Protect GPIO */
38 struct davinci_mmc_plat
40 struct mmc_config cfg;
45 /* Set davinci clock prescalar value based on the required clock in HZ */
46 #if !CONFIG_IS_ENABLED(DM_MMC)
47 static void dmmc_set_clock(struct mmc *mmc, uint clock)
49 struct davinci_mmc *host = mmc->priv;
52 static void davinci_mmc_set_clock(struct udevice *dev, uint clock)
54 struct davinci_mmc_priv *host = dev_get_priv(dev);
55 struct mmc *mmc = mmc_get_mmc_dev(dev);
57 struct davinci_mmc_regs *regs = host->reg_base;
58 uint clkrt, sysclk2, act_clock;
60 if (clock < mmc->cfg->f_min)
61 clock = mmc->cfg->f_min;
62 if (clock > mmc->cfg->f_max)
63 clock = mmc->cfg->f_max;
65 set_val(®s->mmcclk, 0);
66 sysclk2 = host->input_clk;
67 clkrt = (sysclk2 / (2 * clock)) - 1;
69 /* Calculate the actual clock for the divider used */
70 act_clock = (sysclk2 / (2 * (clkrt + 1)));
72 /* Adjust divider if actual clock exceeds the required clock */
73 if (act_clock > clock)
76 /* check clock divider boundary and correct it */
80 set_val(®s->mmcclk, (clkrt | MMCCLK_CLKEN));
83 /* Status bit wait loop for MMCST1 */
85 dmmc_wait_fifo_status(volatile struct davinci_mmc_regs *regs, uint status)
87 uint wdog = WATCHDOG_COUNT;
89 while (--wdog && ((get_val(®s->mmcst1) & status) != status))
92 if (!(get_val(®s->mmcctl) & MMCCTL_WIDTH_4_BIT))
101 /* Busy bit wait loop for MMCST1 */
102 static int dmmc_busy_wait(volatile struct davinci_mmc_regs *regs)
104 uint wdog = WATCHDOG_COUNT;
106 while (--wdog && (get_val(®s->mmcst1) & MMCST1_BUSY))
115 /* Status bit wait loop for MMCST0 - Checks for error bits as well */
116 static int dmmc_check_status(volatile struct davinci_mmc_regs *regs,
117 uint *cur_st, uint st_ready, uint st_error)
119 uint wdog = WATCHDOG_COUNT;
120 uint mmcstatus = *cur_st;
123 if (mmcstatus & st_ready) {
125 mmcstatus = get_val(®s->mmcst1);
127 } else if (mmcstatus & st_error) {
128 if (mmcstatus & MMCST0_TOUTRS)
130 printf("[ ST0 ERROR %x]\n", mmcstatus);
132 * Ignore CRC errors as some MMC cards fail to
133 * initialize on DM365-EVM on the SD1 slot
135 if (mmcstatus & MMCST0_CRCRS)
141 mmcstatus = get_val(®s->mmcst0);
144 printf("Status %x Timeout ST0:%x ST1:%x\n", st_ready, mmcstatus,
145 get_val(®s->mmcst1));
150 * Sends a command out on the bus. Takes the device pointer,
151 * a command pointer, and an optional data pointer.
153 #if !CONFIG_IS_ENABLED(DM_MMC)
154 static int dmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
156 struct davinci_mmc *host = mmc->priv;
159 davinci_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd, struct mmc_data *data)
161 struct davinci_mmc_priv *host = dev_get_priv(dev);
163 volatile struct davinci_mmc_regs *regs = host->reg_base;
164 uint mmcstatus, status_rdy, status_err;
165 uint i, cmddata, bytes_left = 0;
166 int fifo_words, fifo_bytes, err;
167 char *data_buf = NULL;
169 /* Clear status registers */
170 mmcstatus = get_val(®s->mmcst0);
172 fifo_bytes = fifo_words << 2;
174 /* Wait for any previous busy signal to be cleared */
175 dmmc_busy_wait(regs);
177 cmddata = cmd->cmdidx;
178 cmddata |= MMCCMD_PPLEN;
180 /* Send init clock for CMD0 */
181 if (cmd->cmdidx == MMC_CMD_GO_IDLE_STATE)
182 cmddata |= MMCCMD_INITCK;
184 switch (cmd->resp_type) {
186 cmddata |= MMCCMD_BSYEXP;
188 case MMC_RSP_R1: /* R1, R1b, R5, R6, R7 */
189 cmddata |= MMCCMD_RSPFMT_R1567;
192 cmddata |= MMCCMD_RSPFMT_R2;
194 case MMC_RSP_R3: /* R3, R4 */
195 cmddata |= MMCCMD_RSPFMT_R3;
199 set_val(®s->mmcim, 0);
202 /* clear previous data transfer if any and set new one */
203 bytes_left = (data->blocksize * data->blocks);
205 /* Reset FIFO - Always use 32 byte fifo threshold */
206 set_val(®s->mmcfifoctl,
207 (MMCFIFOCTL_FIFOLEV | MMCFIFOCTL_FIFORST));
209 cmddata |= MMCCMD_DMATRIG;
211 cmddata |= MMCCMD_WDATX;
212 if (data->flags == MMC_DATA_READ) {
213 set_val(®s->mmcfifoctl, MMCFIFOCTL_FIFOLEV);
214 } else if (data->flags == MMC_DATA_WRITE) {
215 set_val(®s->mmcfifoctl,
216 (MMCFIFOCTL_FIFOLEV |
217 MMCFIFOCTL_FIFODIR));
218 cmddata |= MMCCMD_DTRW;
221 set_val(®s->mmctod, 0xFFFF);
222 set_val(®s->mmcnblk, (data->blocks & MMCNBLK_NBLK_MASK));
223 set_val(®s->mmcblen, (data->blocksize & MMCBLEN_BLEN_MASK));
225 if (data->flags == MMC_DATA_WRITE) {
227 data_buf = (char *)data->src;
228 /* For write, fill FIFO with data before issue of CMD */
229 for (i = 0; (i < fifo_words) && bytes_left; i++) {
230 memcpy((char *)&val, data_buf, 4);
231 set_val(®s->mmcdxr, val);
237 set_val(®s->mmcblen, 0);
238 set_val(®s->mmcnblk, 0);
241 set_val(®s->mmctor, 0x1FFF);
243 /* Send the command */
244 set_val(®s->mmcarghl, cmd->cmdarg);
245 set_val(®s->mmccmd, cmddata);
247 status_rdy = MMCST0_RSPDNE;
248 status_err = (MMCST0_TOUTRS | MMCST0_TOUTRD |
249 MMCST0_CRCWR | MMCST0_CRCRD);
250 if (cmd->resp_type & MMC_RSP_CRC)
251 status_err |= MMCST0_CRCRS;
253 mmcstatus = get_val(®s->mmcst0);
254 err = dmmc_check_status(regs, &mmcstatus, status_rdy, status_err);
258 /* For R1b wait for busy done */
259 if (cmd->resp_type == MMC_RSP_R1b)
260 dmmc_busy_wait(regs);
262 /* Collect response from controller for specific commands */
263 if (mmcstatus & MMCST0_RSPDNE) {
264 /* Copy the response to the response buffer */
265 if (cmd->resp_type & MMC_RSP_136) {
266 cmd->response[0] = get_val(®s->mmcrsp67);
267 cmd->response[1] = get_val(®s->mmcrsp45);
268 cmd->response[2] = get_val(®s->mmcrsp23);
269 cmd->response[3] = get_val(®s->mmcrsp01);
270 } else if (cmd->resp_type & MMC_RSP_PRESENT) {
271 cmd->response[0] = get_val(®s->mmcrsp67);
278 if (data->flags == MMC_DATA_READ) {
279 /* check for DATDNE along with DRRDY as the controller might
280 * set the DATDNE without DRRDY for smaller transfers with
281 * less than FIFO threshold bytes
283 status_rdy = MMCST0_DRRDY | MMCST0_DATDNE;
284 status_err = MMCST0_TOUTRD | MMCST0_CRCRD;
285 data_buf = data->dest;
287 status_rdy = MMCST0_DXRDY | MMCST0_DATDNE;
288 status_err = MMCST0_CRCWR;
291 /* Wait until all of the blocks are transferred */
293 err = dmmc_check_status(regs, &mmcstatus, status_rdy,
298 if (data->flags == MMC_DATA_READ) {
300 * MMC controller sets the Data receive ready bit
301 * (DRRDY) in MMCST0 even before the entire FIFO is
302 * full. This results in erratic behavior if we start
303 * reading the FIFO soon after DRRDY. Wait for the
304 * FIFO full bit in MMCST1 for proper FIFO clearing.
306 if (bytes_left > fifo_bytes)
307 dmmc_wait_fifo_status(regs, 0x4a);
308 else if (bytes_left == fifo_bytes) {
309 dmmc_wait_fifo_status(regs, 0x40);
310 if (cmd->cmdidx == MMC_CMD_SEND_EXT_CSD)
314 for (i = 0; bytes_left && (i < fifo_words); i++) {
315 cmddata = get_val(®s->mmcdrr);
316 memcpy(data_buf, (char *)&cmddata, 4);
322 * MMC controller sets the Data transmit ready bit
323 * (DXRDY) in MMCST0 even before the entire FIFO is
324 * empty. This results in erratic behavior if we start
325 * writing the FIFO soon after DXRDY. Wait for the
326 * FIFO empty bit in MMCST1 for proper FIFO clearing.
328 dmmc_wait_fifo_status(regs, MMCST1_FIFOEMP);
329 for (i = 0; bytes_left && (i < fifo_words); i++) {
330 memcpy((char *)&cmddata, data_buf, 4);
331 set_val(®s->mmcdxr, cmddata);
335 dmmc_busy_wait(regs);
339 err = dmmc_check_status(regs, &mmcstatus, MMCST0_DATDNE, status_err);
346 /* Initialize Davinci MMC controller */
347 #if !CONFIG_IS_ENABLED(DM_MMC)
348 static int dmmc_init(struct mmc *mmc)
350 struct davinci_mmc *host = mmc->priv;
352 static int davinci_dm_mmc_init(struct udevice *dev)
354 struct davinci_mmc_priv *host = dev_get_priv(dev);
356 struct davinci_mmc_regs *regs = host->reg_base;
358 /* Clear status registers explicitly - soft reset doesn't clear it
359 * If Uboot is invoked from UBL with SDMMC Support, the status
360 * registers can have uncleared bits
362 get_val(®s->mmcst0);
363 get_val(®s->mmcst1);
365 /* Hold software reset */
366 set_bit(®s->mmcctl, MMCCTL_DATRST);
367 set_bit(®s->mmcctl, MMCCTL_CMDRST);
370 set_val(®s->mmcclk, 0x0);
371 set_val(®s->mmctor, 0x1FFF);
372 set_val(®s->mmctod, 0xFFFF);
374 /* Clear software reset */
375 clear_bit(®s->mmcctl, MMCCTL_DATRST);
376 clear_bit(®s->mmcctl, MMCCTL_CMDRST);
380 /* Reset FIFO - Always use the maximum fifo threshold */
381 set_val(®s->mmcfifoctl, (MMCFIFOCTL_FIFOLEV | MMCFIFOCTL_FIFORST));
382 set_val(®s->mmcfifoctl, MMCFIFOCTL_FIFOLEV);
387 /* Set buswidth or clock as indicated by the MMC framework */
388 #if !CONFIG_IS_ENABLED(DM_MMC)
389 static int dmmc_set_ios(struct mmc *mmc)
391 struct davinci_mmc *host = mmc->priv;
392 struct davinci_mmc_regs *regs = host->reg_base;
394 static int davinci_mmc_set_ios(struct udevice *dev)
396 struct mmc *mmc = mmc_get_mmc_dev(dev);
398 struct davinci_mmc_priv *host = dev_get_priv(dev);
399 struct davinci_mmc_regs *regs = host->reg_base;
401 /* Set the bus width */
402 if (mmc->bus_width == 4)
403 set_bit(®s->mmcctl, MMCCTL_WIDTH_4_BIT);
405 clear_bit(®s->mmcctl, MMCCTL_WIDTH_4_BIT);
407 /* Set clock speed */
409 #if !CONFIG_IS_ENABLED(DM_MMC)
410 dmmc_set_clock(mmc, mmc->clock);
412 davinci_mmc_set_clock(dev, mmc->clock);
418 #if !CONFIG_IS_ENABLED(DM_MMC)
419 static const struct mmc_ops dmmc_ops = {
420 .send_cmd = dmmc_send_cmd,
421 .set_ios = dmmc_set_ios,
426 static int davinci_mmc_getcd(struct udevice *dev)
429 #if CONFIG_IS_ENABLED(DM_GPIO)
430 struct davinci_mmc_priv *priv = dev_get_priv(dev);
431 value = dm_gpio_get_value(&priv->cd_gpio);
433 /* if no CD return as 1 */
440 static int davinci_mmc_getwp(struct udevice *dev)
443 #if CONFIG_IS_ENABLED(DM_GPIO)
444 struct davinci_mmc_priv *priv = dev_get_priv(dev);
446 value = dm_gpio_get_value(&priv->wp_gpio);
448 /* if no WP return as 0 */
455 static const struct dm_mmc_ops davinci_mmc_ops = {
456 .send_cmd = davinci_mmc_send_cmd,
457 .set_ios = davinci_mmc_set_ios,
458 .get_cd = davinci_mmc_getcd,
459 .get_wp = davinci_mmc_getwp,
463 #if !CONFIG_IS_ENABLED(DM_MMC)
464 /* Called from board_mmc_init during startup. Can be called multiple times
465 * depending on the number of slots available on board and controller
467 int davinci_mmc_init(bd_t *bis, struct davinci_mmc *host)
469 host->cfg.name = "davinci";
470 host->cfg.ops = &dmmc_ops;
471 host->cfg.f_min = 200000;
472 host->cfg.f_max = 25000000;
473 host->cfg.voltages = host->voltages;
474 host->cfg.host_caps = host->host_caps;
476 host->cfg.b_max = DAVINCI_MAX_BLOCKS;
478 mmc_create(&host->cfg, host);
485 static int davinci_mmc_probe(struct udevice *dev)
487 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
488 struct davinci_mmc_plat *plat = dev_get_platdata(dev);
489 struct davinci_mmc_priv *priv = dev_get_priv(dev);
490 struct mmc_config *cfg = &plat->cfg;
491 #ifdef CONFIG_SPL_BUILD
496 cfg->f_max = 25000000;
497 cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34,
498 cfg->host_caps = MMC_MODE_4BIT, /* DA850 supports only 4-bit SD/MMC */
499 cfg->b_max = DAVINCI_MAX_BLOCKS;
500 cfg->name = "da830-mmc";
502 priv->reg_base = (struct davinci_mmc_regs *)dev_read_addr(dev);
503 priv->input_clk = clk_get(DAVINCI_MMCSD_CLKID);
505 #if CONFIG_IS_ENABLED(DM_GPIO)
506 /* These GPIOs are optional */
507 gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio, GPIOD_IS_IN);
508 gpio_request_by_name(dev, "wp-gpios", 0, &priv->wp_gpio, GPIOD_IS_IN);
511 upriv->mmc = &plat->mmc;
513 #ifdef CONFIG_SPL_BUILD
515 * FIXME This is a temporary workaround to enable the driver model in
516 * SPL on omapl138-lcdk. For some reason the bind() callback is not
517 * being called in SPL for MMC which breaks the mmc boot - the hack
518 * is to call mmc_bind() from probe(). We also don't have full DT
519 * support in SPL, hence the hard-coded base register address.
521 priv->reg_base = (struct davinci_mmc_regs *)DAVINCI_MMC_SD0_BASE;
522 ret = mmc_bind(dev, &plat->mmc, &plat->cfg);
527 return davinci_dm_mmc_init(dev);
530 static int davinci_mmc_bind(struct udevice *dev)
532 struct davinci_mmc_plat *plat = dev_get_platdata(dev);
534 return mmc_bind(dev, &plat->mmc, &plat->cfg);
537 static const struct udevice_id davinci_mmc_ids[] = {
538 { .compatible = "ti,da830-mmc" },
542 U_BOOT_DRIVER(davinci_mmc_drv) = {
543 .name = "davinci_mmc",
545 .of_match = davinci_mmc_ids,
547 .bind = davinci_mmc_bind,
549 .probe = davinci_mmc_probe,
550 .ops = &davinci_mmc_ops,
551 .platdata_auto_alloc_size = sizeof(struct davinci_mmc_plat),
552 .priv_auto_alloc_size = sizeof(struct davinci_mmc_priv),