1 // SPDX-License-Identifier: GPL-2.0
3  * bcm2835 sdhost driver.
20  * This code was ported to U-Boot by
22  * and is based on drivers/mmc/host/bcm2835.c in Linux which is written by
24  *  Copyright (C) 2015-2016 Raspberry Pi (Trading) Ltd.
26  *  mmc-bcm2835.c by Gellert Weisz
28  *  sdhci-bcm2708.c by Broadcom
29  *  sdhci-bcm2835.c by Stephen Warren and Oleksandr Tymoshenko
30  *  sdhci.c and sdhci-pci.c by Pierre Ossman
37 #include <asm/arch/mbox.h>
48 #define SDCMD  0x00 /* Command to SD card              - 16 R/W */
49 #define SDARG  0x04 /* Argument to SD card             - 32 R/W */
50 #define SDTOUT 0x08 /* Start value for timeout counter - 32 R/W */
51 #define SDCDIV 0x0c /* Start value for clock divider   - 11 R/W */
52 #define SDRSP0 0x10 /* SD card response (31:0)         - 32 R   */
53 #define SDRSP1 0x14 /* SD card response (63:32)        - 32 R   */
54 #define SDRSP2 0x18 /* SD card response (95:64)        - 32 R   */
55 #define SDRSP3 0x1c /* SD card response (127:96)       - 32 R   */
56 #define SDHSTS 0x20 /* SD host status                  - 11 R/W */
57 #define SDVDD  0x30 /* SD card power control           -  1 R/W */
58 #define SDEDM  0x34 /* Emergency Debug Mode            - 13 R/W */
59 #define SDHCFG 0x38 /* Host configuration              -  2 R/W */
60 #define SDHBCT 0x3c /* Host byte count (debug)         - 32 R/W */
61 #define SDDATA 0x40 /* Data to/from SD card            - 32 R/W */
62 #define SDHBLC 0x50 /* Host block count (SDIO/SDHC)    -  9 R/W */
185 	dev_dbg(dev, "SDCMD  0x%08x\n", readl(host->ioaddr + SDCMD));  in bcm2835_dumpregs()
186 	dev_dbg(dev, "SDARG  0x%08x\n", readl(host->ioaddr + SDARG));  in bcm2835_dumpregs()
187 	dev_dbg(dev, "SDTOUT 0x%08x\n", readl(host->ioaddr + SDTOUT));  in bcm2835_dumpregs()
188 	dev_dbg(dev, "SDCDIV 0x%08x\n", readl(host->ioaddr + SDCDIV));  in bcm2835_dumpregs()
189 	dev_dbg(dev, "SDRSP0 0x%08x\n", readl(host->ioaddr + SDRSP0));  in bcm2835_dumpregs()
190 	dev_dbg(dev, "SDRSP1 0x%08x\n", readl(host->ioaddr + SDRSP1));  in bcm2835_dumpregs()
191 	dev_dbg(dev, "SDRSP2 0x%08x\n", readl(host->ioaddr + SDRSP2));  in bcm2835_dumpregs()
192 	dev_dbg(dev, "SDRSP3 0x%08x\n", readl(host->ioaddr + SDRSP3));  in bcm2835_dumpregs()
193 	dev_dbg(dev, "SDHSTS 0x%08x\n", readl(host->ioaddr + SDHSTS));  in bcm2835_dumpregs()
194 	dev_dbg(dev, "SDVDD  0x%08x\n", readl(host->ioaddr + SDVDD));  in bcm2835_dumpregs()
195 	dev_dbg(dev, "SDEDM  0x%08x\n", readl(host->ioaddr + SDEDM));  in bcm2835_dumpregs()
196 	dev_dbg(dev, "SDHCFG 0x%08x\n", readl(host->ioaddr + SDHCFG));  in bcm2835_dumpregs()
197 	dev_dbg(dev, "SDHBCT 0x%08x\n", readl(host->ioaddr + SDHBCT));  in bcm2835_dumpregs()
198 	dev_dbg(dev, "SDHBLC 0x%08x\n", readl(host->ioaddr + SDHBLC));  in bcm2835_dumpregs()
206 	writel(SDVDD_POWER_OFF, host->ioaddr + SDVDD);  in bcm2835_reset_internal()
207 	writel(0, host->ioaddr + SDCMD);  in bcm2835_reset_internal()
208 	writel(0, host->ioaddr + SDARG);  in bcm2835_reset_internal()
210 	writel(0xf00000, host->ioaddr + SDTOUT);  in bcm2835_reset_internal()
211 	writel(0, host->ioaddr + SDCDIV);  in bcm2835_reset_internal()
213 	writel(SDHSTS_CLEAR_MASK, host->ioaddr + SDHSTS);  in bcm2835_reset_internal()
214 	writel(0, host->ioaddr + SDHCFG);  in bcm2835_reset_internal()
215 	writel(0, host->ioaddr + SDHBCT);  in bcm2835_reset_internal()
216 	writel(0, host->ioaddr + SDHBLC);  in bcm2835_reset_internal()
219 	temp = readl(host->ioaddr + SDEDM);  in bcm2835_reset_internal()
224 	writel(temp, host->ioaddr + SDEDM);  in bcm2835_reset_internal()
227 	writel(SDVDD_POWER_ON, host->ioaddr + SDVDD);  in bcm2835_reset_internal()
230 	host->clock = 0;  in bcm2835_reset_internal()
231 	writel(host->hcfg, host->ioaddr + SDHCFG);  in bcm2835_reset_internal()
232 	writel(host->cdiv, host->ioaddr + SDCDIV);  in bcm2835_reset_internal()
242 		edm = readl(host->ioaddr + SDEDM);  in bcm2835_wait_transfer_complete()
253 			       host->ioaddr + SDEDM);  in bcm2835_wait_transfer_complete()
259 			dev_err(host->dev,  in bcm2835_wait_transfer_complete()
260 				"wait_transfer_complete - still waiting after %d retries\n",  in bcm2835_wait_transfer_complete()
263 			return -ETIMEDOUT;  in bcm2835_wait_transfer_complete()
272 	struct mmc_data *data = host->data;  in bcm2835_transfer_block_pio()
273 	size_t blksize = data->blocksize;  in bcm2835_transfer_block_pio()
279 		return -EINVAL;  in bcm2835_transfer_block_pio()
281 	buf = is_read ? (u32 *)data->dest : (u32 *)data->src;  in bcm2835_transfer_block_pio()
284 		data->dest += blksize;  in bcm2835_transfer_block_pio()
286 		data->src += blksize;  in bcm2835_transfer_block_pio()
299 		edm = readl(host->ioaddr + SDEDM);  in bcm2835_transfer_block_pio()
303 			words = SDDATA_FIFO_WORDS - edm_fifo_fill(edm);  in bcm2835_transfer_block_pio()
319 				hsts = readl(host->ioaddr + SDHSTS);  in bcm2835_transfer_block_pio()
330 		copy_words -= words;  in bcm2835_transfer_block_pio()
335 				*(buf++) = readl(host->ioaddr + SDDATA);  in bcm2835_transfer_block_pio()
337 				writel(*(buf++), host->ioaddr + SDDATA);  in bcm2835_transfer_block_pio()
338 			words--;  in bcm2835_transfer_block_pio()
351 	is_read = (host->data->flags & MMC_DATA_READ) != 0;  in bcm2835_transfer_pio()
356 	sdhsts = readl(host->ioaddr + SDHSTS);  in bcm2835_transfer_pio()
360 		printf("%s transfer error - HSTS %08x\n",  in bcm2835_transfer_pio()
362 		ret =  -EILSEQ;  in bcm2835_transfer_pio()
365 		printf("%s timeout error - HSTS %08x\n",  in bcm2835_transfer_pio()
367 		ret = -ETIMEDOUT;  in bcm2835_transfer_pio()
376 	WARN_ON(host->data);  in bcm2835_prepare_data()
378 	host->data = data;  in bcm2835_prepare_data()
383 	host->blocks = data->blocks;  in bcm2835_prepare_data()
385 	writel(data->blocksize, host->ioaddr + SDHBCT);  in bcm2835_prepare_data()
386 	writel(data->blocks, host->ioaddr + SDHBLC);  in bcm2835_prepare_data()
395 	ret = readl_poll_timeout(host->ioaddr + SDCMD, value,  in bcm2835_read_wait_sdcmd()
397 	if (ret == -ETIMEDOUT)  in bcm2835_read_wait_sdcmd()
408 	WARN_ON(host->cmd);  in bcm2835_send_command()
410 	if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY)) {  in bcm2835_send_command()
412 		return -EINVAL;  in bcm2835_send_command()
419 		return -EBUSY;  in bcm2835_send_command()
422 	host->cmd = cmd;  in bcm2835_send_command()
425 	sdhsts = readl(host->ioaddr + SDHSTS);  in bcm2835_send_command()
427 		writel(sdhsts, host->ioaddr + SDHSTS);  in bcm2835_send_command()
431 	writel(cmd->cmdarg, host->ioaddr + SDARG);  in bcm2835_send_command()
433 	sdcmd = cmd->cmdidx & SDCMD_CMD_MASK;  in bcm2835_send_command()
435 	host->use_busy = false;  in bcm2835_send_command()
436 	if (!(cmd->resp_type & MMC_RSP_PRESENT)) {  in bcm2835_send_command()
439 		if (cmd->resp_type & MMC_RSP_136)  in bcm2835_send_command()
441 		if (cmd->resp_type & MMC_RSP_BUSY) {  in bcm2835_send_command()
443 			host->use_busy = true;  in bcm2835_send_command()
448 		if (data->flags & MMC_DATA_WRITE)  in bcm2835_send_command()
450 		if (data->flags & MMC_DATA_READ)  in bcm2835_send_command()
454 	writel(sdcmd | SDCMD_NEW_FLAG, host->ioaddr + SDCMD);  in bcm2835_send_command()
461 	struct mmc_cmd *cmd = host->cmd;  in bcm2835_finish_command()
471 		return -EIO;  in bcm2835_finish_command()
473 		u32 sdhsts = readl(host->ioaddr + SDHSTS);  in bcm2835_finish_command()
476 		writel(SDHSTS_ERROR_MASK, host->ioaddr + SDHSTS);  in bcm2835_finish_command()
479 		    (host->cmd->cmdidx != MMC_CMD_SEND_OP_COND)) {  in bcm2835_finish_command()
481 				ret = -ETIMEDOUT;  in bcm2835_finish_command()
484 				       host->cmd->cmdidx);  in bcm2835_finish_command()
486 				ret = -EILSEQ;  in bcm2835_finish_command()
493 	if (cmd->resp_type & MMC_RSP_PRESENT) {  in bcm2835_finish_command()
494 		if (cmd->resp_type & MMC_RSP_136) {  in bcm2835_finish_command()
498 				cmd->response[3 - i] =  in bcm2835_finish_command()
499 					readl(host->ioaddr + SDRSP0 + i * 4);  in bcm2835_finish_command()
502 			cmd->response[0] = readl(host->ioaddr + SDRSP0);  in bcm2835_finish_command()
507 	host->cmd = NULL;  in bcm2835_finish_command()
514 	int ret = -EINVAL;  in bcm2835_check_cmd_error()
519 	if (!host->cmd)  in bcm2835_check_cmd_error()
520 		return -EINVAL;  in bcm2835_check_cmd_error()
524 		ret = -EILSEQ;  in bcm2835_check_cmd_error()
527 		ret = -EILSEQ;  in bcm2835_check_cmd_error()
529 		ret = -ETIMEDOUT;  in bcm2835_check_cmd_error()
539 	if (!host->data)  in bcm2835_check_data_error()
542 		ret = -EILSEQ;  in bcm2835_check_data_error()
544 		ret = -ETIMEDOUT;  in bcm2835_check_data_error()
554 	u32 intmask = readl(host->ioaddr + SDHSTS);  in bcm2835_transmit()
567 	if (host->use_busy && (intmask & SDHSTS_BUSY_IRPT)) {  in bcm2835_transmit()
568 		writel(SDHSTS_BUSY_IRPT, host->ioaddr + SDHSTS);  in bcm2835_transmit()
569 		host->use_busy = false;  in bcm2835_transmit()
574 	if (host->data) {  in bcm2835_transmit()
578 		host->blocks--;  in bcm2835_transmit()
579 		if (host->blocks == 0) {  in bcm2835_transmit()
585 			host->data = NULL;  in bcm2835_transmit()
596 	/* The SDCDIV register has 11 bits, and holds (div - 2).  But  in bcm2835_set_clock()
601 	 * must be 100-400KHz, so can range check the requested  in bcm2835_set_clock()
605 	 * clock 250MHz -> 0->125MHz, 1->83.3MHz, 2->62.5MHz, 3->50.0MHz  in bcm2835_set_clock()
606 	 *                 4->41.7MHz, 5->35.7MHz, 6->31.3MHz, 7->27.8MHz  in bcm2835_set_clock()
608 	 *		 623->400KHz/27.8MHz  in bcm2835_set_clock()
609 	 *		 reset value (507)->491159/50MHz  in bcm2835_set_clock()
611 	 * BUT, the 3-bit clock divisor in data mode is too small if  in bcm2835_set_clock()
621 		host->cdiv = SDCDIV_MAX_CDIV;  in bcm2835_set_clock()
622 		writel(host->cdiv, host->ioaddr + SDCDIV);  in bcm2835_set_clock()
626 	div = host->max_clk / clock;  in bcm2835_set_clock()
629 	if ((host->max_clk / div) > clock)  in bcm2835_set_clock()
631 	div -= 2;  in bcm2835_set_clock()
636 	clock = host->max_clk / (div + 2);  in bcm2835_set_clock()
637 	host->mmc->clock = clock;  in bcm2835_set_clock()
641 	host->ns_per_fifo_word = (1000000000 / clock) *  in bcm2835_set_clock()
642 		((host->mmc->card_caps & MMC_MODE_4BIT) ? 8 : 32);  in bcm2835_set_clock()
644 	host->cdiv = div;  in bcm2835_set_clock()
645 	writel(host->cdiv, host->ioaddr + SDCDIV);  in bcm2835_set_clock()
648 	writel(host->mmc->clock / 2, host->ioaddr + SDTOUT);  in bcm2835_set_clock()
653 	return !(x & (x - 1));  in is_power_of_2()
663 	if (data && !is_power_of_2(data->blocksize)) {  in bcm2835_send_cmd()
664 		printf("unsupported block size (%d bytes)\n", data->blocksize);  in bcm2835_send_cmd()
667 			return -EINVAL;  in bcm2835_send_cmd()
670 	edm = readl(host->ioaddr + SDEDM);  in bcm2835_send_cmd()
675 	    (cmd && cmd->cmdidx != MMC_CMD_STOP_TRANSMISSION)) {  in bcm2835_send_cmd()
677 		       readl(host->ioaddr + SDCMD) & SDCMD_CMD_MASK, edm);  in bcm2835_send_cmd()
681 			return -EILSEQ;  in bcm2835_send_cmd()
688 		if (!ret && !host->use_busy)  in bcm2835_send_cmd()
693 	while (host->use_busy || host->data) {  in bcm2835_send_cmd()
707 	if (!mmc->clock || mmc->clock != host->clock) {  in bcm2835_set_ios()
708 		bcm2835_set_clock(host, mmc->clock);  in bcm2835_set_ios()
709 		host->clock = mmc->clock;  in bcm2835_set_ios()
713 	host->hcfg &= ~SDHCFG_WIDE_EXT_BUS;  in bcm2835_set_ios()
714 	if (mmc->bus_width == 4)  in bcm2835_set_ios()
715 		host->hcfg |= SDHCFG_WIDE_EXT_BUS;  in bcm2835_set_ios()
717 	host->hcfg |= SDHCFG_WIDE_INT_BUS;  in bcm2835_set_ios()
720 	host->hcfg |= SDHCFG_SLOW_CARD;  in bcm2835_set_ios()
722 	writel(host->hcfg, host->ioaddr + SDHCFG);  in bcm2835_set_ios()
729 	struct mmc_config *cfg = &host->plat->cfg;  in bcm2835_add_host()
731 	cfg->f_max = host->max_clk;  in bcm2835_add_host()
732 	cfg->f_min = host->max_clk / SDCDIV_MAX_CDIV;  in bcm2835_add_host()
733 	cfg->b_max = 65535;  in bcm2835_add_host()
736 		cfg->f_max, cfg->f_min);  in bcm2835_add_host()
739 	cfg->host_caps = MMC_MODE_4BIT | MMC_MODE_HS | MMC_MODE_HS_52MHz;  in bcm2835_add_host()
742 	cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;  in bcm2835_add_host()
745 	host->hcfg = SDHCFG_BUSY_IRPT_EN;  in bcm2835_add_host()
757 	host->dev = dev;  in bcm2835_probe()
758 	host->mmc = mmc;  in bcm2835_probe()
759 	host->plat = plat;  in bcm2835_probe()
760 	upriv->mmc = &plat->mmc;  in bcm2835_probe()
761 	plat->cfg.name = dev->name;  in bcm2835_probe()
763 	host->phys_addr = devfdt_get_addr(dev);  in bcm2835_probe()
764 	if (host->phys_addr == FDT_ADDR_T_NONE)  in bcm2835_probe()
765 		return -EINVAL;  in bcm2835_probe()
767 	host->ioaddr = devm_ioremap(dev, host->phys_addr, SZ_256);  in bcm2835_probe()
768 	if (!host->ioaddr)  in bcm2835_probe()
769 		return -ENOMEM;  in bcm2835_probe()
771 	host->max_clk = bcm2835_get_mmc_clock(BCM2835_MBOX_CLOCK_ID_CORE);  in bcm2835_probe()
775 	dev_dbg(dev, "%s -> OK\n", __func__);  in bcm2835_probe()
781 	{ .compatible = "brcm,bcm2835-sdhost" },
794 	return mmc_bind(dev, &plat->mmc, &plat->cfg);  in bcm2835_bind()
798 	.name = "bcm2835-sdhost",