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>
19 #define DAVINCI_MAX_BLOCKS (32)
20 #define WATCHDOG_COUNT (100000)
22 #define get_val(addr) REG(addr)
23 #define set_val(addr, val) REG(addr) = (val)
24 #define set_bit(addr, val) set_val((addr), (get_val(addr) | (val)))
25 #define clear_bit(addr, val) set_val((addr), (get_val(addr) & ~(val)))
28 struct davinci_of_data {
33 /* Davinci MMC board definitions */
34 struct davinci_mmc_priv {
35 struct davinci_mmc_regs *reg_base; /* Register base address */
36 uint input_clk; /* Input clock to MMC controller */
37 uint version; /* MMC Controller version */
40 struct davinci_mmc_plat
42 struct mmc_config cfg;
47 /* Set davinci clock prescalar value based on the required clock in HZ */
48 #if !CONFIG_IS_ENABLED(DM_MMC)
49 static void dmmc_set_clock(struct mmc *mmc, uint clock)
51 struct davinci_mmc *host = mmc->priv;
54 static void davinci_mmc_set_clock(struct udevice *dev, uint clock)
56 struct davinci_mmc_priv *host = dev_get_priv(dev);
57 struct mmc *mmc = mmc_get_mmc_dev(dev);
59 struct davinci_mmc_regs *regs = host->reg_base;
60 uint clkrt, sysclk2, act_clock;
62 if (clock < mmc->cfg->f_min)
63 clock = mmc->cfg->f_min;
64 if (clock > mmc->cfg->f_max)
65 clock = mmc->cfg->f_max;
67 set_val(®s->mmcclk, 0);
68 sysclk2 = host->input_clk;
69 clkrt = (sysclk2 / (2 * clock)) - 1;
71 /* Calculate the actual clock for the divider used */
72 act_clock = (sysclk2 / (2 * (clkrt + 1)));
74 /* Adjust divider if actual clock exceeds the required clock */
75 if (act_clock > clock)
78 /* check clock divider boundary and correct it */
82 set_val(®s->mmcclk, (clkrt | MMCCLK_CLKEN));
85 /* Status bit wait loop for MMCST1 */
87 dmmc_wait_fifo_status(volatile struct davinci_mmc_regs *regs, uint status)
89 uint wdog = WATCHDOG_COUNT;
91 while (--wdog && ((get_val(®s->mmcst1) & status) != status))
94 if (!(get_val(®s->mmcctl) & MMCCTL_WIDTH_4_BIT))
103 /* Busy bit wait loop for MMCST1 */
104 static int dmmc_busy_wait(volatile struct davinci_mmc_regs *regs)
106 uint wdog = WATCHDOG_COUNT;
108 while (--wdog && (get_val(®s->mmcst1) & MMCST1_BUSY))
117 /* Status bit wait loop for MMCST0 - Checks for error bits as well */
118 static int dmmc_check_status(volatile struct davinci_mmc_regs *regs,
119 uint *cur_st, uint st_ready, uint st_error)
121 uint wdog = WATCHDOG_COUNT;
122 uint mmcstatus = *cur_st;
125 if (mmcstatus & st_ready) {
127 mmcstatus = get_val(®s->mmcst1);
129 } else if (mmcstatus & st_error) {
130 if (mmcstatus & MMCST0_TOUTRS)
132 printf("[ ST0 ERROR %x]\n", mmcstatus);
134 * Ignore CRC errors as some MMC cards fail to
135 * initialize on DM365-EVM on the SD1 slot
137 if (mmcstatus & MMCST0_CRCRS)
143 mmcstatus = get_val(®s->mmcst0);
146 printf("Status %x Timeout ST0:%x ST1:%x\n", st_ready, mmcstatus,
147 get_val(®s->mmcst1));
152 * Sends a command out on the bus. Takes the device pointer,
153 * a command pointer, and an optional data pointer.
155 #if !CONFIG_IS_ENABLED(DM_MMC)
156 static int dmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
158 struct davinci_mmc *host = mmc->priv;
161 davinci_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd, struct mmc_data *data)
163 struct davinci_mmc_priv *host = dev_get_priv(dev);
165 volatile struct davinci_mmc_regs *regs = host->reg_base;
166 uint mmcstatus, status_rdy, status_err;
167 uint i, cmddata, bytes_left = 0;
168 int fifo_words, fifo_bytes, err;
169 char *data_buf = NULL;
171 /* Clear status registers */
172 mmcstatus = get_val(®s->mmcst0);
173 fifo_words = (host->version == MMC_CTLR_VERSION_2) ? 16 : 8;
174 fifo_bytes = fifo_words << 2;
176 /* Wait for any previous busy signal to be cleared */
177 dmmc_busy_wait(regs);
179 cmddata = cmd->cmdidx;
180 cmddata |= MMCCMD_PPLEN;
182 /* Send init clock for CMD0 */
183 if (cmd->cmdidx == MMC_CMD_GO_IDLE_STATE)
184 cmddata |= MMCCMD_INITCK;
186 switch (cmd->resp_type) {
188 cmddata |= MMCCMD_BSYEXP;
190 case MMC_RSP_R1: /* R1, R1b, R5, R6, R7 */
191 cmddata |= MMCCMD_RSPFMT_R1567;
194 cmddata |= MMCCMD_RSPFMT_R2;
196 case MMC_RSP_R3: /* R3, R4 */
197 cmddata |= MMCCMD_RSPFMT_R3;
201 set_val(®s->mmcim, 0);
204 /* clear previous data transfer if any and set new one */
205 bytes_left = (data->blocksize * data->blocks);
207 /* Reset FIFO - Always use 32 byte fifo threshold */
208 set_val(®s->mmcfifoctl,
209 (MMCFIFOCTL_FIFOLEV | MMCFIFOCTL_FIFORST));
211 if (host->version == MMC_CTLR_VERSION_2)
212 cmddata |= MMCCMD_DMATRIG;
214 cmddata |= MMCCMD_WDATX;
215 if (data->flags == MMC_DATA_READ) {
216 set_val(®s->mmcfifoctl, MMCFIFOCTL_FIFOLEV);
217 } else if (data->flags == MMC_DATA_WRITE) {
218 set_val(®s->mmcfifoctl,
219 (MMCFIFOCTL_FIFOLEV |
220 MMCFIFOCTL_FIFODIR));
221 cmddata |= MMCCMD_DTRW;
224 set_val(®s->mmctod, 0xFFFF);
225 set_val(®s->mmcnblk, (data->blocks & MMCNBLK_NBLK_MASK));
226 set_val(®s->mmcblen, (data->blocksize & MMCBLEN_BLEN_MASK));
228 if (data->flags == MMC_DATA_WRITE) {
230 data_buf = (char *)data->src;
231 /* For write, fill FIFO with data before issue of CMD */
232 for (i = 0; (i < fifo_words) && bytes_left; i++) {
233 memcpy((char *)&val, data_buf, 4);
234 set_val(®s->mmcdxr, val);
240 set_val(®s->mmcblen, 0);
241 set_val(®s->mmcnblk, 0);
244 set_val(®s->mmctor, 0x1FFF);
246 /* Send the command */
247 set_val(®s->mmcarghl, cmd->cmdarg);
248 set_val(®s->mmccmd, cmddata);
250 status_rdy = MMCST0_RSPDNE;
251 status_err = (MMCST0_TOUTRS | MMCST0_TOUTRD |
252 MMCST0_CRCWR | MMCST0_CRCRD);
253 if (cmd->resp_type & MMC_RSP_CRC)
254 status_err |= MMCST0_CRCRS;
256 mmcstatus = get_val(®s->mmcst0);
257 err = dmmc_check_status(regs, &mmcstatus, status_rdy, status_err);
261 /* For R1b wait for busy done */
262 if (cmd->resp_type == MMC_RSP_R1b)
263 dmmc_busy_wait(regs);
265 /* Collect response from controller for specific commands */
266 if (mmcstatus & MMCST0_RSPDNE) {
267 /* Copy the response to the response buffer */
268 if (cmd->resp_type & MMC_RSP_136) {
269 cmd->response[0] = get_val(®s->mmcrsp67);
270 cmd->response[1] = get_val(®s->mmcrsp45);
271 cmd->response[2] = get_val(®s->mmcrsp23);
272 cmd->response[3] = get_val(®s->mmcrsp01);
273 } else if (cmd->resp_type & MMC_RSP_PRESENT) {
274 cmd->response[0] = get_val(®s->mmcrsp67);
281 if (data->flags == MMC_DATA_READ) {
282 /* check for DATDNE along with DRRDY as the controller might
283 * set the DATDNE without DRRDY for smaller transfers with
284 * less than FIFO threshold bytes
286 status_rdy = MMCST0_DRRDY | MMCST0_DATDNE;
287 status_err = MMCST0_TOUTRD | MMCST0_CRCRD;
288 data_buf = data->dest;
290 status_rdy = MMCST0_DXRDY | MMCST0_DATDNE;
291 status_err = MMCST0_CRCWR;
294 /* Wait until all of the blocks are transferred */
296 err = dmmc_check_status(regs, &mmcstatus, status_rdy,
301 if (data->flags == MMC_DATA_READ) {
303 * MMC controller sets the Data receive ready bit
304 * (DRRDY) in MMCST0 even before the entire FIFO is
305 * full. This results in erratic behavior if we start
306 * reading the FIFO soon after DRRDY. Wait for the
307 * FIFO full bit in MMCST1 for proper FIFO clearing.
309 if (bytes_left > fifo_bytes)
310 dmmc_wait_fifo_status(regs, 0x4a);
311 else if (bytes_left == fifo_bytes) {
312 dmmc_wait_fifo_status(regs, 0x40);
313 if (cmd->cmdidx == MMC_CMD_SEND_EXT_CSD)
317 for (i = 0; bytes_left && (i < fifo_words); i++) {
318 cmddata = get_val(®s->mmcdrr);
319 memcpy(data_buf, (char *)&cmddata, 4);
325 * MMC controller sets the Data transmit ready bit
326 * (DXRDY) in MMCST0 even before the entire FIFO is
327 * empty. This results in erratic behavior if we start
328 * writing the FIFO soon after DXRDY. Wait for the
329 * FIFO empty bit in MMCST1 for proper FIFO clearing.
331 dmmc_wait_fifo_status(regs, MMCST1_FIFOEMP);
332 for (i = 0; bytes_left && (i < fifo_words); i++) {
333 memcpy((char *)&cmddata, data_buf, 4);
334 set_val(®s->mmcdxr, cmddata);
338 dmmc_busy_wait(regs);
342 err = dmmc_check_status(regs, &mmcstatus, MMCST0_DATDNE, status_err);
349 /* Initialize Davinci MMC controller */
350 #if !CONFIG_IS_ENABLED(DM_MMC)
351 static int dmmc_init(struct mmc *mmc)
353 struct davinci_mmc *host = mmc->priv;
355 static int davinci_dm_mmc_init(struct udevice *dev)
357 struct davinci_mmc_priv *host = dev_get_priv(dev);
359 struct davinci_mmc_regs *regs = host->reg_base;
361 /* Clear status registers explicitly - soft reset doesn't clear it
362 * If Uboot is invoked from UBL with SDMMC Support, the status
363 * registers can have uncleared bits
365 get_val(®s->mmcst0);
366 get_val(®s->mmcst1);
368 /* Hold software reset */
369 set_bit(®s->mmcctl, MMCCTL_DATRST);
370 set_bit(®s->mmcctl, MMCCTL_CMDRST);
373 set_val(®s->mmcclk, 0x0);
374 set_val(®s->mmctor, 0x1FFF);
375 set_val(®s->mmctod, 0xFFFF);
377 /* Clear software reset */
378 clear_bit(®s->mmcctl, MMCCTL_DATRST);
379 clear_bit(®s->mmcctl, MMCCTL_CMDRST);
383 /* Reset FIFO - Always use the maximum fifo threshold */
384 set_val(®s->mmcfifoctl, (MMCFIFOCTL_FIFOLEV | MMCFIFOCTL_FIFORST));
385 set_val(®s->mmcfifoctl, MMCFIFOCTL_FIFOLEV);
390 /* Set buswidth or clock as indicated by the MMC framework */
391 #if !CONFIG_IS_ENABLED(DM_MMC)
392 static int dmmc_set_ios(struct mmc *mmc)
394 struct davinci_mmc *host = mmc->priv;
395 struct davinci_mmc_regs *regs = host->reg_base;
397 static int davinci_mmc_set_ios(struct udevice *dev)
399 struct mmc *mmc = mmc_get_mmc_dev(dev);
401 struct davinci_mmc_priv *host = dev_get_priv(dev);
402 struct davinci_mmc_regs *regs = host->reg_base;
404 /* Set the bus width */
405 if (mmc->bus_width == 4)
406 set_bit(®s->mmcctl, MMCCTL_WIDTH_4_BIT);
408 clear_bit(®s->mmcctl, MMCCTL_WIDTH_4_BIT);
410 /* Set clock speed */
412 #if !CONFIG_IS_ENABLED(DM_MMC)
413 dmmc_set_clock(mmc, mmc->clock);
415 davinci_mmc_set_clock(dev, mmc->clock);
421 #if !CONFIG_IS_ENABLED(DM_MMC)
422 static const struct mmc_ops dmmc_ops = {
423 .send_cmd = dmmc_send_cmd,
424 .set_ios = dmmc_set_ios,
428 static const struct dm_mmc_ops davinci_mmc_ops = {
429 .send_cmd = davinci_mmc_send_cmd,
430 .set_ios = davinci_mmc_set_ios,
434 #if !CONFIG_IS_ENABLED(DM_MMC)
435 /* Called from board_mmc_init during startup. Can be called multiple times
436 * depending on the number of slots available on board and controller
438 int davinci_mmc_init(bd_t *bis, struct davinci_mmc *host)
440 host->cfg.name = "davinci";
441 host->cfg.ops = &dmmc_ops;
442 host->cfg.f_min = 200000;
443 host->cfg.f_max = 25000000;
444 host->cfg.voltages = host->voltages;
445 host->cfg.host_caps = host->host_caps;
447 host->cfg.b_max = DAVINCI_MAX_BLOCKS;
449 mmc_create(&host->cfg, host);
456 static int davinci_mmc_probe(struct udevice *dev)
458 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
459 struct davinci_mmc_plat *plat = dev_get_platdata(dev);
460 struct davinci_mmc_priv *priv = dev_get_priv(dev);
461 struct mmc_config *cfg = &plat->cfg;
462 struct davinci_of_data *data =
463 (struct davinci_of_data *)dev_get_driver_data(dev);
465 cfg->f_max = 25000000;
466 cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34,
467 cfg->host_caps = MMC_MODE_4BIT, /* DA850 supports only 4-bit SD/MMC */
468 cfg->b_max = DAVINCI_MAX_BLOCKS;
471 cfg->name = data->name;
472 priv->version = data->version;
475 priv->reg_base = (struct davinci_mmc_regs *)dev_read_addr(dev);
476 priv->input_clk = clk_get(DAVINCI_MMCSD_CLKID);
478 upriv->mmc = &plat->mmc;
480 return davinci_dm_mmc_init(dev);
483 static int davinci_mmc_bind(struct udevice *dev)
485 struct davinci_mmc_plat *plat = dev_get_platdata(dev);
487 return mmc_bind(dev, &plat->mmc, &plat->cfg);
491 const struct davinci_of_data davinci_mmc_host_info[] = {
493 .name = "dm6441-mmc",
494 .version = MMC_CTLR_VERSION_1,
498 .version = MMC_CTLR_VERSION_2,
503 static const struct udevice_id davinci_mmc_ids[] = {
505 .compatible = "ti,dm6441-mmc",
506 .data = (ulong) &davinci_mmc_host_info[MMC_CTLR_VERSION_1]
509 .compatible = "ti,da830-mmc",
510 .data = (ulong) &davinci_mmc_host_info[MMC_CTLR_VERSION_2]
515 U_BOOT_DRIVER(davinci_mmc_drv) = {
516 .name = "davinci_mmc",
518 .of_match = davinci_mmc_ids,
520 .bind = davinci_mmc_bind,
522 .probe = davinci_mmc_probe,
523 .ops = &davinci_mmc_ops,
524 .platdata_auto_alloc_size = sizeof(struct davinci_mmc_plat),
525 .priv_auto_alloc_size = sizeof(struct davinci_mmc_priv),