1 // SPDX-License-Identifier: GPL-2.0-only
3  *  linux/drivers/mmc/host/pxa.c - PXA MMCI driver
8  *   - No way to clear interrupts.
9  *   - Have to turn off the clock whenever we touch the device.
10  *   - Doesn't tell you how many data blocks were transferred.
23 #include <linux/dma-mapping.h>
27 #include <linux/mmc/slot-gpio.h>
30 #include <linux/gpio/consumer.h>
38 #include <linux/platform_data/mmc-pxamci.h>
42 #define DRIVER_NAME	"pxa2xx-mci"
79 	struct mmc_host *mmc = host->mmc;  in pxamci_init_ocr()
86 	if (IS_ERR(mmc->supply.vmmc)) {  in pxamci_init_ocr()
87 		/* fall-back to platform data */  in pxamci_init_ocr()
88 		mmc->ocr_avail = host->pdata ?  in pxamci_init_ocr()
89 			host->pdata->ocr_mask :  in pxamci_init_ocr()
100 	struct mmc_host *mmc = host->mmc;  in pxamci_set_power()
101 	struct regulator *supply = mmc->supply.vmmc;  in pxamci_set_power()  local
103 	if (!IS_ERR(supply))  in pxamci_set_power()
104 		return mmc_regulator_set_ocr(mmc, supply, vdd);  in pxamci_set_power()
106 	if (host->power) {  in pxamci_set_power()
107 		bool on = !!((1 << vdd) & host->pdata->ocr_mask);  in pxamci_set_power()
108 		gpiod_set_value(host->power, on);  in pxamci_set_power()
111 	if (host->pdata && host->pdata->setpower)  in pxamci_set_power()
112 		return host->pdata->setpower(mmc_dev(host->mmc), vdd);  in pxamci_set_power()
119 	if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {  in pxamci_stop_clock()
123 		writel(STOP_CLOCK, host->base + MMC_STRPCL);  in pxamci_stop_clock()
126 			v = readl(host->base + MMC_STAT);  in pxamci_stop_clock()
130 		} while (timeout--);  in pxamci_stop_clock()
133 			dev_err(mmc_dev(host->mmc), "unable to stop clock\n");  in pxamci_stop_clock()
141 	spin_lock_irqsave(&host->lock, flags);  in pxamci_enable_irq()
142 	host->imask &= ~mask;  in pxamci_enable_irq()
143 	writel(host->imask, host->base + MMC_I_MASK);  in pxamci_enable_irq()
144 	spin_unlock_irqrestore(&host->lock, flags);  in pxamci_enable_irq()
151 	spin_lock_irqsave(&host->lock, flags);  in pxamci_disable_irq()
152 	host->imask |= mask;  in pxamci_disable_irq()
153 	writel(host->imask, host->base + MMC_I_MASK);  in pxamci_disable_irq()
154 	spin_unlock_irqrestore(&host->lock, flags);  in pxamci_disable_irq()
165 	unsigned int nob = data->blocks;  in pxamci_setup_data()
170 	host->data = data;  in pxamci_setup_data()
172 	writel(nob, host->base + MMC_NOB);  in pxamci_setup_data()
173 	writel(data->blksz, host->base + MMC_BLKLEN);  in pxamci_setup_data()
175 	clks = (unsigned long long)data->timeout_ns * host->clkrate;  in pxamci_setup_data()
177 	timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);  in pxamci_setup_data()
178 	writel((timeout + 255) / 256, host->base + MMC_RDTO);  in pxamci_setup_data()
183 	config.src_addr = host->res->start + MMC_RXFIFO;  in pxamci_setup_data()
184 	config.dst_addr = host->res->start + MMC_TXFIFO;  in pxamci_setup_data()
188 	if (data->flags & MMC_DATA_READ) {  in pxamci_setup_data()
189 		host->dma_dir = DMA_FROM_DEVICE;  in pxamci_setup_data()
191 		chan = host->dma_chan_rx;  in pxamci_setup_data()
193 		host->dma_dir = DMA_TO_DEVICE;  in pxamci_setup_data()
195 		chan = host->dma_chan_tx;  in pxamci_setup_data()
202 		dev_err(mmc_dev(host->mmc), "dma slave config failed\n");  in pxamci_setup_data()
206 	host->dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len,  in pxamci_setup_data()
207 				   host->dma_dir);  in pxamci_setup_data()
209 	tx = dmaengine_prep_slave_sg(chan, data->sg, host->dma_len, direction,  in pxamci_setup_data()
212 		dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n");  in pxamci_setup_data()
216 	if (!(data->flags & MMC_DATA_READ)) {  in pxamci_setup_data()
217 		tx->callback = pxamci_dma_irq;  in pxamci_setup_data()
218 		tx->callback_param = host;  in pxamci_setup_data()
221 	host->dma_cookie = dmaengine_submit(tx);  in pxamci_setup_data()
229 	if (!cpu_is_pxa27x() || data->flags & MMC_DATA_READ)  in pxamci_setup_data()
235 	WARN_ON(host->cmd != NULL);  in pxamci_start_cmd()
236 	host->cmd = cmd;  in pxamci_start_cmd()
238 	if (cmd->flags & MMC_RSP_BUSY)  in pxamci_start_cmd()
256 	writel(cmd->opcode, host->base + MMC_CMD);  in pxamci_start_cmd()
257 	writel(cmd->arg >> 16, host->base + MMC_ARGH);  in pxamci_start_cmd()
258 	writel(cmd->arg & 0xffff, host->base + MMC_ARGL);  in pxamci_start_cmd()
259 	writel(cmdat, host->base + MMC_CMDAT);  in pxamci_start_cmd()
260 	writel(host->clkrt, host->base + MMC_CLKRT);  in pxamci_start_cmd()
262 	writel(START_CLOCK, host->base + MMC_STRPCL);  in pxamci_start_cmd()
269 	host->mrq = NULL;  in pxamci_finish_request()
270 	host->cmd = NULL;  in pxamci_finish_request()
271 	host->data = NULL;  in pxamci_finish_request()
272 	mmc_request_done(host->mmc, mrq);  in pxamci_finish_request()
277 	struct mmc_command *cmd = host->cmd;  in pxamci_cmd_done()
284 	host->cmd = NULL;  in pxamci_cmd_done()
288 	 * discard the upper 8 bits of the first 16-bit word.  in pxamci_cmd_done()
290 	v = readl(host->base + MMC_RES) & 0xffff;  in pxamci_cmd_done()
292 		u32 w1 = readl(host->base + MMC_RES) & 0xffff;  in pxamci_cmd_done()
293 		u32 w2 = readl(host->base + MMC_RES) & 0xffff;  in pxamci_cmd_done()
294 		cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8;  in pxamci_cmd_done()
299 		cmd->error = -ETIMEDOUT;  in pxamci_cmd_done()
300 	} else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {  in pxamci_cmd_done()
308 		    (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000))  in pxamci_cmd_done()
309 			pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode);  in pxamci_cmd_done()
311 			cmd->error = -EILSEQ;  in pxamci_cmd_done()
315 	if (host->data && !cmd->error) {  in pxamci_cmd_done()
321 		if (cpu_is_pxa27x() && host->data->flags & MMC_DATA_WRITE)  in pxamci_cmd_done()
322 			dma_async_issue_pending(host->dma_chan_tx);  in pxamci_cmd_done()
324 		pxamci_finish_request(host, host->mrq);  in pxamci_cmd_done()
332 	struct mmc_data *data = host->data;  in pxamci_data_done()
338 	if (data->flags & MMC_DATA_READ)  in pxamci_data_done()
339 		chan = host->dma_chan_rx;  in pxamci_data_done()
341 		chan = host->dma_chan_tx;  in pxamci_data_done()
342 	dma_unmap_sg(chan->device->dev,  in pxamci_data_done()
343 		     data->sg, data->sg_len, host->dma_dir);  in pxamci_data_done()
346 		data->error = -ETIMEDOUT;  in pxamci_data_done()
348 		data->error = -EILSEQ;  in pxamci_data_done()
356 	if (!data->error)  in pxamci_data_done()
357 		data->bytes_xfered = data->blocks * data->blksz;  in pxamci_data_done()
359 		data->bytes_xfered = 0;  in pxamci_data_done()
363 	host->data = NULL;  in pxamci_data_done()
364 	if (host->mrq->stop) {  in pxamci_data_done()
366 		pxamci_start_cmd(host, host->mrq->stop, host->cmdat);  in pxamci_data_done()
368 		pxamci_finish_request(host, host->mrq);  in pxamci_data_done()
380 	ireg = readl(host->base + MMC_I_REG) & ~readl(host->base + MMC_I_MASK);  in pxamci_irq()
383 		unsigned stat = readl(host->base + MMC_STAT);  in pxamci_irq()
392 			mmc_signal_sdio_irq(host->mmc);  in pxamci_irq()
405 	WARN_ON(host->mrq != NULL);  in pxamci_request()
407 	host->mrq = mrq;  in pxamci_request()
411 	cmdat = host->cmdat;  in pxamci_request()
412 	host->cmdat &= ~CMDAT_INIT;  in pxamci_request()
414 	if (mrq->data) {  in pxamci_request()
415 		pxamci_setup_data(host, mrq->data);  in pxamci_request()
419 		if (mrq->data->flags & MMC_DATA_WRITE)  in pxamci_request()
423 	pxamci_start_cmd(host, mrq->cmd, cmdat);  in pxamci_request()
430 	if (host->use_ro_gpio)  in pxamci_get_ro()
432 	if (host->pdata && host->pdata->get_ro)  in pxamci_get_ro()
433 		return !!host->pdata->get_ro(mmc_dev(mmc));  in pxamci_get_ro()
438 	return -ENOSYS;  in pxamci_get_ro()
445 	if (ios->clock) {  in pxamci_set_ios()
446 		unsigned long rate = host->clkrate;  in pxamci_set_ios()
447 		unsigned int clk = rate / ios->clock;  in pxamci_set_ios()
449 		if (host->clkrt == CLKRT_OFF)  in pxamci_set_ios()
450 			clk_prepare_enable(host->clk);  in pxamci_set_ios()
452 		if (ios->clock == 26000000) {  in pxamci_set_ios()
454 			host->clkrt = 7;  in pxamci_set_ios()
465 			if (rate / clk > ios->clock)  in pxamci_set_ios()
467 			host->clkrt = fls(clk) - 1;  in pxamci_set_ios()
475 		if (host->clkrt != CLKRT_OFF) {  in pxamci_set_ios()
476 			host->clkrt = CLKRT_OFF;  in pxamci_set_ios()
477 			clk_disable_unprepare(host->clk);  in pxamci_set_ios()
481 	if (host->power_mode != ios->power_mode) {  in pxamci_set_ios()
484 		host->power_mode = ios->power_mode;  in pxamci_set_ios()
486 		ret = pxamci_set_power(host, ios->power_mode, ios->vdd);  in pxamci_set_ios()
498 		if (ios->power_mode == MMC_POWER_ON)  in pxamci_set_ios()
499 			host->cmdat |= CMDAT_INIT;  in pxamci_set_ios()
502 	if (ios->bus_width == MMC_BUS_WIDTH_4)  in pxamci_set_ios()
503 		host->cmdat |= CMDAT_SD_4DAT;  in pxamci_set_ios()
505 		host->cmdat &= ~CMDAT_SD_4DAT;  in pxamci_set_ios()
508 		host->clkrt, host->cmdat);  in pxamci_set_ios()
537 	spin_lock_irqsave(&host->lock, flags);  in pxamci_dma_irq()
539 	if (!host->data)  in pxamci_dma_irq()
542 	if (host->data->flags & MMC_DATA_READ)  in pxamci_dma_irq()
543 		chan = host->dma_chan_rx;  in pxamci_dma_irq()
545 		chan = host->dma_chan_tx;  in pxamci_dma_irq()
547 	status = dmaengine_tx_status(chan, host->dma_cookie, &state);  in pxamci_dma_irq()
550 		writel(BUF_PART_FULL, host->base + MMC_PRTBUF);  in pxamci_dma_irq()
552 		pr_err("%s: DMA error on %s channel\n", mmc_hostname(host->mmc),  in pxamci_dma_irq()
553 			host->data->flags & MMC_DATA_READ ? "rx" : "tx");  in pxamci_dma_irq()
554 		host->data->error = -EIO;  in pxamci_dma_irq()
559 	spin_unlock_irqrestore(&host->lock, flags);  in pxamci_dma_irq()
566 	mmc_detect_change(devid, msecs_to_jiffies(host->detect_delay_ms));  in pxamci_detect_irq()
572         { .compatible = "marvell,pxa-mmc" },
581 	struct device_node *np = pdev->dev.of_node;  in pxamci_of_init()
589 	/* pxa-mmc specific */  in pxamci_of_init()
590 	if (of_property_read_u32(np, "pxa-mmc,detect-delay-ms", &tmp) == 0)  in pxamci_of_init()
591 		host->detect_delay_ms = tmp;  in pxamci_of_init()
611 	struct device *dev = &pdev->dev;  in pxamci_probe()
622 		ret = -ENOMEM;  in pxamci_probe()
626 	mmc->ops = &pxamci_ops;  in pxamci_probe()
629 	 * We can do SG-DMA, but we don't because we never know how much  in pxamci_probe()
632 	mmc->max_segs = NR_SG;  in pxamci_probe()
637 	mmc->max_seg_size = PAGE_SIZE;  in pxamci_probe()
642 	mmc->max_blk_size = cpu_is_pxa25x() ? 1023 : 2048;  in pxamci_probe()
647 	mmc->max_blk_count = 65535;  in pxamci_probe()
654 	host->mmc = mmc;  in pxamci_probe()
655 	host->pdata = pdev->dev.platform_data;  in pxamci_probe()
656 	host->clkrt = CLKRT_OFF;  in pxamci_probe()
658 	host->clk = devm_clk_get(dev, NULL);  in pxamci_probe()
659 	if (IS_ERR(host->clk)) {  in pxamci_probe()
660 		ret = PTR_ERR(host->clk);  in pxamci_probe()
661 		host->clk = NULL;  in pxamci_probe()
665 	host->clkrate = clk_get_rate(host->clk);  in pxamci_probe()
670 	mmc->f_min = (host->clkrate + 63) / 64;  in pxamci_probe()
671 	mmc->f_max = (mmc_has_26MHz()) ? 26000000 : host->clkrate;  in pxamci_probe()
677 	mmc->caps = 0;  in pxamci_probe()
678 	host->cmdat = 0;  in pxamci_probe()
680 		mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;  in pxamci_probe()
681 		host->cmdat |= CMDAT_SDIO_INT_EN;  in pxamci_probe()
683 			mmc->caps |= MMC_CAP_MMC_HIGHSPEED |  in pxamci_probe()
687 	spin_lock_init(&host->lock);  in pxamci_probe()
688 	host->res = r;  in pxamci_probe()
689 	host->imask = MMC_I_MASK_ALL;  in pxamci_probe()
691 	host->base = devm_ioremap_resource(dev, r);  in pxamci_probe()
692 	if (IS_ERR(host->base)) {  in pxamci_probe()
693 		ret = PTR_ERR(host->base);  in pxamci_probe()
702 	writel(0, host->base + MMC_SPI);  in pxamci_probe()
703 	writel(64, host->base + MMC_RESTO);  in pxamci_probe()
704 	writel(host->imask, host->base + MMC_I_MASK);  in pxamci_probe()
713 	host->dma_chan_rx = dma_request_chan(dev, "rx");  in pxamci_probe()
714 	if (IS_ERR(host->dma_chan_rx)) {  in pxamci_probe()
716 		ret = PTR_ERR(host->dma_chan_rx);  in pxamci_probe()
717 		host->dma_chan_rx = NULL;  in pxamci_probe()
721 	host->dma_chan_tx = dma_request_chan(dev, "tx");  in pxamci_probe()
722 	if (IS_ERR(host->dma_chan_tx)) {  in pxamci_probe()
724 		ret = PTR_ERR(host->dma_chan_tx);  in pxamci_probe()
725 		host->dma_chan_tx = NULL;  in pxamci_probe()
729 	if (host->pdata) {  in pxamci_probe()
730 		host->detect_delay_ms = host->pdata->detect_delay_ms;  in pxamci_probe()
732 		host->power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);  in pxamci_probe()
733 		if (IS_ERR(host->power)) {  in pxamci_probe()
740 		if (ret && ret != -ENOENT) {  in pxamci_probe()
745 		if (!host->pdata->gpio_card_ro_invert)  in pxamci_probe()
746 			mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;  in pxamci_probe()
749 		if (ret && ret != -ENOENT) {  in pxamci_probe()
754 			host->use_ro_gpio = true;  in pxamci_probe()
756 		if (host->pdata->init)  in pxamci_probe()
757 			host->pdata->init(dev, pxamci_detect_irq, mmc);  in pxamci_probe()
759 		if (host->power && host->pdata->setpower)  in pxamci_probe()
761 		if (host->use_ro_gpio && host->pdata->get_ro)  in pxamci_probe()
771 		if (host->dma_chan_rx)  in pxamci_probe()
772 			dma_release_channel(host->dma_chan_rx);  in pxamci_probe()
773 		if (host->dma_chan_tx)  in pxamci_probe()
774 			dma_release_channel(host->dma_chan_tx);  in pxamci_probe()
790 		if (host->pdata && host->pdata->exit)  in pxamci_remove()
791 			host->pdata->exit(&pdev->dev, mmc);  in pxamci_remove()
796 		       host->base + MMC_I_MASK);  in pxamci_remove()
798 		dmaengine_terminate_all(host->dma_chan_rx);  in pxamci_remove()
799 		dmaengine_terminate_all(host->dma_chan_tx);  in pxamci_remove()
800 		dma_release_channel(host->dma_chan_rx);  in pxamci_remove()
801 		dma_release_channel(host->dma_chan_tx);  in pxamci_remove()
823 MODULE_ALIAS("platform:pxa2xx-mci");