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 WATCHDOG_COUNT (100000)
23 #define get_val(addr) REG(addr)
24 #define set_val(addr, val) REG(addr) = (val)
25 #define set_bit(addr, val) set_val((addr), (get_val(addr) | (val)))
26 #define clear_bit(addr, val) set_val((addr), (get_val(addr) & ~(val)))
29 /* Davinci MMC board definitions */
30 struct davinci_mmc_priv {
31 struct davinci_mmc_regs *reg_base; /* Register base address */
32 uint input_clk; /* Input clock to MMC controller */
33 struct gpio_desc cd_gpio; /* Card Detect GPIO */
34 struct gpio_desc wp_gpio; /* Write Protect GPIO */
38 /* Set davinci clock prescalar value based on the required clock in HZ */
39 #if !CONFIG_IS_ENABLED(DM_MMC)
40 static void dmmc_set_clock(struct mmc *mmc, uint clock)
42 struct davinci_mmc *host = mmc->priv;
45 static void davinci_mmc_set_clock(struct udevice *dev, uint clock)
47 struct davinci_mmc_priv *host = dev_get_priv(dev);
48 struct mmc *mmc = mmc_get_mmc_dev(dev);
50 struct davinci_mmc_regs *regs = host->reg_base;
51 uint clkrt, sysclk2, act_clock;
53 if (clock < mmc->cfg->f_min)
54 clock = mmc->cfg->f_min;
55 if (clock > mmc->cfg->f_max)
56 clock = mmc->cfg->f_max;
58 set_val(®s->mmcclk, 0);
59 sysclk2 = host->input_clk;
60 clkrt = (sysclk2 / (2 * clock)) - 1;
62 /* Calculate the actual clock for the divider used */
63 act_clock = (sysclk2 / (2 * (clkrt + 1)));
65 /* Adjust divider if actual clock exceeds the required clock */
66 if (act_clock > clock)
69 /* check clock divider boundary and correct it */
73 set_val(®s->mmcclk, (clkrt | MMCCLK_CLKEN));
76 /* Status bit wait loop for MMCST1 */
78 dmmc_wait_fifo_status(volatile struct davinci_mmc_regs *regs, uint status)
80 uint wdog = WATCHDOG_COUNT;
82 while (--wdog && ((get_val(®s->mmcst1) & status) != status))
85 if (!(get_val(®s->mmcctl) & MMCCTL_WIDTH_4_BIT))
94 /* Busy bit wait loop for MMCST1 */
95 static int dmmc_busy_wait(volatile struct davinci_mmc_regs *regs)
97 uint wdog = WATCHDOG_COUNT;
99 while (--wdog && (get_val(®s->mmcst1) & MMCST1_BUSY))
108 /* Status bit wait loop for MMCST0 - Checks for error bits as well */
109 static int dmmc_check_status(volatile struct davinci_mmc_regs *regs,
110 uint *cur_st, uint st_ready, uint st_error)
112 uint wdog = WATCHDOG_COUNT;
113 uint mmcstatus = *cur_st;
116 if (mmcstatus & st_ready) {
118 mmcstatus = get_val(®s->mmcst1);
120 } else if (mmcstatus & st_error) {
121 if (mmcstatus & MMCST0_TOUTRS)
123 printf("[ ST0 ERROR %x]\n", mmcstatus);
125 * Ignore CRC errors as some MMC cards fail to
126 * initialize on DM365-EVM on the SD1 slot
128 if (mmcstatus & MMCST0_CRCRS)
134 mmcstatus = get_val(®s->mmcst0);
137 printf("Status %x Timeout ST0:%x ST1:%x\n", st_ready, mmcstatus,
138 get_val(®s->mmcst1));
143 * Sends a command out on the bus. Takes the device pointer,
144 * a command pointer, and an optional data pointer.
146 #if !CONFIG_IS_ENABLED(DM_MMC)
147 static int dmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
149 struct davinci_mmc *host = mmc->priv;
152 davinci_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd, struct mmc_data *data)
154 struct davinci_mmc_priv *host = dev_get_priv(dev);
156 volatile struct davinci_mmc_regs *regs = host->reg_base;
157 uint mmcstatus, status_rdy, status_err;
158 uint i, cmddata, bytes_left = 0;
159 int fifo_words, fifo_bytes, err;
160 char *data_buf = NULL;
162 /* Clear status registers */
163 mmcstatus = get_val(®s->mmcst0);
165 fifo_bytes = fifo_words << 2;
167 /* Wait for any previous busy signal to be cleared */
168 dmmc_busy_wait(regs);
170 cmddata = cmd->cmdidx;
171 cmddata |= MMCCMD_PPLEN;
173 /* Send init clock for CMD0 */
174 if (cmd->cmdidx == MMC_CMD_GO_IDLE_STATE)
175 cmddata |= MMCCMD_INITCK;
177 switch (cmd->resp_type) {
179 cmddata |= MMCCMD_BSYEXP;
181 case MMC_RSP_R1: /* R1, R1b, R5, R6, R7 */
182 cmddata |= MMCCMD_RSPFMT_R1567;
185 cmddata |= MMCCMD_RSPFMT_R2;
187 case MMC_RSP_R3: /* R3, R4 */
188 cmddata |= MMCCMD_RSPFMT_R3;
192 set_val(®s->mmcim, 0);
195 /* clear previous data transfer if any and set new one */
196 bytes_left = (data->blocksize * data->blocks);
198 /* Reset FIFO - Always use 32 byte fifo threshold */
199 set_val(®s->mmcfifoctl,
200 (MMCFIFOCTL_FIFOLEV | MMCFIFOCTL_FIFORST));
202 cmddata |= MMCCMD_DMATRIG;
204 cmddata |= MMCCMD_WDATX;
205 if (data->flags == MMC_DATA_READ) {
206 set_val(®s->mmcfifoctl, MMCFIFOCTL_FIFOLEV);
207 } else if (data->flags == MMC_DATA_WRITE) {
208 set_val(®s->mmcfifoctl,
209 (MMCFIFOCTL_FIFOLEV |
210 MMCFIFOCTL_FIFODIR));
211 cmddata |= MMCCMD_DTRW;
214 set_val(®s->mmctod, 0xFFFF);
215 set_val(®s->mmcnblk, (data->blocks & MMCNBLK_NBLK_MASK));
216 set_val(®s->mmcblen, (data->blocksize & MMCBLEN_BLEN_MASK));
218 if (data->flags == MMC_DATA_WRITE) {
220 data_buf = (char *)data->src;
221 /* For write, fill FIFO with data before issue of CMD */
222 for (i = 0; (i < fifo_words) && bytes_left; i++) {
223 memcpy((char *)&val, data_buf, 4);
224 set_val(®s->mmcdxr, val);
230 set_val(®s->mmcblen, 0);
231 set_val(®s->mmcnblk, 0);
234 set_val(®s->mmctor, 0x1FFF);
236 /* Send the command */
237 set_val(®s->mmcarghl, cmd->cmdarg);
238 set_val(®s->mmccmd, cmddata);
240 status_rdy = MMCST0_RSPDNE;
241 status_err = (MMCST0_TOUTRS | MMCST0_TOUTRD |
242 MMCST0_CRCWR | MMCST0_CRCRD);
243 if (cmd->resp_type & MMC_RSP_CRC)
244 status_err |= MMCST0_CRCRS;
246 mmcstatus = get_val(®s->mmcst0);
247 err = dmmc_check_status(regs, &mmcstatus, status_rdy, status_err);
251 /* For R1b wait for busy done */
252 if (cmd->resp_type == MMC_RSP_R1b)
253 dmmc_busy_wait(regs);
255 /* Collect response from controller for specific commands */
256 if (mmcstatus & MMCST0_RSPDNE) {
257 /* Copy the response to the response buffer */
258 if (cmd->resp_type & MMC_RSP_136) {
259 cmd->response[0] = get_val(®s->mmcrsp67);
260 cmd->response[1] = get_val(®s->mmcrsp45);
261 cmd->response[2] = get_val(®s->mmcrsp23);
262 cmd->response[3] = get_val(®s->mmcrsp01);
263 } else if (cmd->resp_type & MMC_RSP_PRESENT) {
264 cmd->response[0] = get_val(®s->mmcrsp67);
271 if (data->flags == MMC_DATA_READ) {
272 /* check for DATDNE along with DRRDY as the controller might
273 * set the DATDNE without DRRDY for smaller transfers with
274 * less than FIFO threshold bytes
276 status_rdy = MMCST0_DRRDY | MMCST0_DATDNE;
277 status_err = MMCST0_TOUTRD | MMCST0_CRCRD;
278 data_buf = data->dest;
280 status_rdy = MMCST0_DXRDY | MMCST0_DATDNE;
281 status_err = MMCST0_CRCWR;
284 /* Wait until all of the blocks are transferred */
286 err = dmmc_check_status(regs, &mmcstatus, status_rdy,
291 if (data->flags == MMC_DATA_READ) {
293 * MMC controller sets the Data receive ready bit
294 * (DRRDY) in MMCST0 even before the entire FIFO is
295 * full. This results in erratic behavior if we start
296 * reading the FIFO soon after DRRDY. Wait for the
297 * FIFO full bit in MMCST1 for proper FIFO clearing.
299 if (bytes_left > fifo_bytes)
300 dmmc_wait_fifo_status(regs, 0x4a);
301 else if (bytes_left == fifo_bytes) {
302 dmmc_wait_fifo_status(regs, 0x40);
303 if (cmd->cmdidx == MMC_CMD_SEND_EXT_CSD)
307 for (i = 0; bytes_left && (i < fifo_words); i++) {
308 cmddata = get_val(®s->mmcdrr);
309 memcpy(data_buf, (char *)&cmddata, 4);
315 * MMC controller sets the Data transmit ready bit
316 * (DXRDY) in MMCST0 even before the entire FIFO is
317 * empty. This results in erratic behavior if we start
318 * writing the FIFO soon after DXRDY. Wait for the
319 * FIFO empty bit in MMCST1 for proper FIFO clearing.
321 dmmc_wait_fifo_status(regs, MMCST1_FIFOEMP);
322 for (i = 0; bytes_left && (i < fifo_words); i++) {
323 memcpy((char *)&cmddata, data_buf, 4);
324 set_val(®s->mmcdxr, cmddata);
328 dmmc_busy_wait(regs);
332 err = dmmc_check_status(regs, &mmcstatus, MMCST0_DATDNE, status_err);
339 /* Initialize Davinci MMC controller */
340 #if !CONFIG_IS_ENABLED(DM_MMC)
341 static int dmmc_init(struct mmc *mmc)
343 struct davinci_mmc *host = mmc->priv;
345 static int davinci_dm_mmc_init(struct udevice *dev)
347 struct davinci_mmc_priv *host = dev_get_priv(dev);
349 struct davinci_mmc_regs *regs = host->reg_base;
351 /* Clear status registers explicitly - soft reset doesn't clear it
352 * If Uboot is invoked from UBL with SDMMC Support, the status
353 * registers can have uncleared bits
355 get_val(®s->mmcst0);
356 get_val(®s->mmcst1);
358 /* Hold software reset */
359 set_bit(®s->mmcctl, MMCCTL_DATRST);
360 set_bit(®s->mmcctl, MMCCTL_CMDRST);
363 set_val(®s->mmcclk, 0x0);
364 set_val(®s->mmctor, 0x1FFF);
365 set_val(®s->mmctod, 0xFFFF);
367 /* Clear software reset */
368 clear_bit(®s->mmcctl, MMCCTL_DATRST);
369 clear_bit(®s->mmcctl, MMCCTL_CMDRST);
373 /* Reset FIFO - Always use the maximum fifo threshold */
374 set_val(®s->mmcfifoctl, (MMCFIFOCTL_FIFOLEV | MMCFIFOCTL_FIFORST));
375 set_val(®s->mmcfifoctl, MMCFIFOCTL_FIFOLEV);
380 /* Set buswidth or clock as indicated by the MMC framework */
381 #if !CONFIG_IS_ENABLED(DM_MMC)
382 static int dmmc_set_ios(struct mmc *mmc)
384 struct davinci_mmc *host = mmc->priv;
385 struct davinci_mmc_regs *regs = host->reg_base;
387 static int davinci_mmc_set_ios(struct udevice *dev)
389 struct mmc *mmc = mmc_get_mmc_dev(dev);
391 struct davinci_mmc_priv *host = dev_get_priv(dev);
392 struct davinci_mmc_regs *regs = host->reg_base;
394 /* Set the bus width */
395 if (mmc->bus_width == 4)
396 set_bit(®s->mmcctl, MMCCTL_WIDTH_4_BIT);
398 clear_bit(®s->mmcctl, MMCCTL_WIDTH_4_BIT);
400 /* Set clock speed */
402 #if !CONFIG_IS_ENABLED(DM_MMC)
403 dmmc_set_clock(mmc, mmc->clock);
405 davinci_mmc_set_clock(dev, mmc->clock);
411 #if !CONFIG_IS_ENABLED(DM_MMC)
412 static const struct mmc_ops dmmc_ops = {
413 .send_cmd = dmmc_send_cmd,
414 .set_ios = dmmc_set_ios,
419 static int davinci_mmc_getcd(struct udevice *dev)
422 #if CONFIG_IS_ENABLED(DM_GPIO)
423 struct davinci_mmc_priv *priv = dev_get_priv(dev);
424 value = dm_gpio_get_value(&priv->cd_gpio);
426 /* if no CD return as 1 */
433 static int davinci_mmc_getwp(struct udevice *dev)
436 #if CONFIG_IS_ENABLED(DM_GPIO)
437 struct davinci_mmc_priv *priv = dev_get_priv(dev);
439 value = dm_gpio_get_value(&priv->wp_gpio);
441 /* if no WP return as 0 */
448 static const struct dm_mmc_ops davinci_mmc_ops = {
449 .send_cmd = davinci_mmc_send_cmd,
450 .set_ios = davinci_mmc_set_ios,
451 .get_cd = davinci_mmc_getcd,
452 .get_wp = davinci_mmc_getwp,
456 #if !CONFIG_IS_ENABLED(DM_MMC)
457 /* Called from board_mmc_init during startup. Can be called multiple times
458 * depending on the number of slots available on board and controller
460 int davinci_mmc_init(bd_t *bis, struct davinci_mmc *host)
462 host->cfg.name = "davinci";
463 host->cfg.ops = &dmmc_ops;
464 host->cfg.f_min = 200000;
465 host->cfg.f_max = 25000000;
466 host->cfg.voltages = host->voltages;
467 host->cfg.host_caps = host->host_caps;
469 host->cfg.b_max = DAVINCI_MAX_BLOCKS;
471 mmc_create(&host->cfg, host);
478 static int davinci_mmc_probe(struct udevice *dev)
480 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
481 struct davinci_mmc_plat *plat = dev_get_platdata(dev);
482 struct davinci_mmc_priv *priv = dev_get_priv(dev);
484 priv->reg_base = plat->reg_base;
485 priv->input_clk = clk_get(DAVINCI_MMCSD_CLKID);
486 #if CONFIG_IS_ENABLED(DM_GPIO)
487 /* These GPIOs are optional */
488 gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio, GPIOD_IS_IN);
489 gpio_request_by_name(dev, "wp-gpios", 0, &priv->wp_gpio, GPIOD_IS_IN);
491 upriv->mmc = &plat->mmc;
493 return davinci_dm_mmc_init(dev);
496 static int davinci_mmc_bind(struct udevice *dev)
498 struct davinci_mmc_plat *plat = dev_get_platdata(dev);
500 return mmc_bind(dev, &plat->mmc, &plat->cfg);
503 #if CONFIG_IS_ENABLED(OF_CONTROL)
504 static int davinci_mmc_ofdata_to_platdata(struct udevice *dev)
506 struct davinci_mmc_plat *plat = dev_get_platdata(dev);
507 struct mmc_config *cfg = &plat->cfg;
509 plat->reg_base = (struct davinci_mmc_regs *)dev_read_addr(dev);
511 cfg->f_max = 25000000;
512 cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34,
513 cfg->host_caps = MMC_MODE_4BIT, /* DA850 supports only 4-bit SD/MMC */
514 cfg->b_max = DAVINCI_MAX_BLOCKS;
515 cfg->name = "da830-mmc";
520 static const struct udevice_id davinci_mmc_ids[] = {
521 { .compatible = "ti,da830-mmc" },
525 U_BOOT_DRIVER(davinci_mmc_drv) = {
526 .name = "davinci_mmc",
528 #if CONFIG_IS_ENABLED(OF_CONTROL)
529 .of_match = davinci_mmc_ids,
530 .platdata_auto_alloc_size = sizeof(struct davinci_mmc_plat),
531 .ofdata_to_platdata = davinci_mmc_ofdata_to_platdata,
534 .bind = davinci_mmc_bind,
536 .probe = davinci_mmc_probe,
537 .ops = &davinci_mmc_ops,
538 .priv_auto_alloc_size = sizeof(struct davinci_mmc_priv),
539 #if !CONFIG_IS_ENABLED(OF_CONTROL)
540 .flags = DM_FLAG_PRE_RELOC,