From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from ns.lynxeye.de ([87.118.118.114] helo=lynxeye.de) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Vnw2p-00074v-Uw for barebox@lists.infradead.org; Tue, 03 Dec 2013 19:54:12 +0000 Received: from tellur.localdomain (p54831992.dip0.t-ipconnect.de [84.131.25.146]) by lynxeye.de (Postfix) with ESMTPA id D7F8818B4268 for ; Tue, 3 Dec 2013 20:52:22 +0100 (CET) From: Lucas Stach Date: Tue, 3 Dec 2013 20:57:00 +0100 Message-Id: <1386100622-8498-8-git-send-email-dev@lynxeye.de> In-Reply-To: <1386100622-8498-1-git-send-email-dev@lynxeye.de> References: <1386100622-8498-1-git-send-email-dev@lynxeye.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 6/8] tegra: add SDMMC controller driver To: barebox@lists.infradead.org Confirmed working on Tegra 2, may need some small adjustments for Tegra 3. Signed-off-by: Lucas Stach --- drivers/mci/Kconfig | 7 + drivers/mci/Makefile | 1 + drivers/mci/tegra-sdmmc.c | 465 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 473 insertions(+) create mode 100644 drivers/mci/tegra-sdmmc.c diff --git a/drivers/mci/Kconfig b/drivers/mci/Kconfig index bd85424..3c86483 100644 --- a/drivers/mci/Kconfig +++ b/drivers/mci/Kconfig @@ -107,6 +107,13 @@ config MCI_MMCI Enable this entry to add support to read and write SD cards on a ARM AMBA PL180. +config MCI_TEGRA + bool "Tegra SD/MMC" + depends on ARCH_TEGRA + help + Enable this to support SD and MMC card read/write on a Tegra based + systems. + config MCI_SPI bool "MMC/SD over SPI" select CRC7 diff --git a/drivers/mci/Makefile b/drivers/mci/Makefile index 421ca9f..1e8443c 100644 --- a/drivers/mci/Makefile +++ b/drivers/mci/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_MCI_MXS) += mxs.o obj-$(CONFIG_MCI_OMAP_HSMMC) += omap_hsmmc.o obj-$(CONFIG_MCI_PXA) += pxamci.o obj-$(CONFIG_MCI_S3C) += s3c.o +obj-$(CONFIG_MCI_TEGRA) += tegra-sdmmc.o obj-$(CONFIG_MCI_SPI) += mci_spi.o obj-$(CONFIG_MCI_DW) += dw_mmc.o obj-$(CONFIG_MCI_MMCI) += mmci.o diff --git a/drivers/mci/tegra-sdmmc.c b/drivers/mci/tegra-sdmmc.c new file mode 100644 index 0000000..7f4fa87 --- /dev/null +++ b/drivers/mci/tegra-sdmmc.c @@ -0,0 +1,465 @@ +/* + * Copyright (C) 2013 Lucas Stach + * + * Partly based on code (C) Copyright 2010-2013 + * NVIDIA Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sdhci.h" + +#define TEGRA_SDMMC_PRESENT_STATE 0x024 +#define TEGRA_SDMMC_PRESENT_STATE_CMD_INHIBIT_CMD (1 << 0) +#define TEGRA_SDMMC_PRESENT_STATE_CMD_INHIBIT_DAT (1 << 1) + +#define TEGRA_SDMMC_PWR_CNTL 0x028 +#define TEGRA_SDMMC_PWR_CNTL_SD_BUS (1 << 8) +#define TEGRA_SDMMC_PWR_CNTL_33_V (7 << 9) + +#define TEGRA_SDMMC_CLK_CNTL 0x02c +#define TEGRA_SDMMC_CLK_CNTL_SW_RESET_FOR_ALL (1 << 24) +#define TEGRA_SDMMC_CLK_CNTL_SD_CLOCK_EN (1 << 2) +#define TEGRA_SDMMC_CLK_INTERNAL_CLOCK_STABLE (1 << 1) +#define TEGRA_SDMMC_CLK_CNTL_INTERNAL_CLOCK_EN (1 << 0) + +#define TEGRA_SDMMC_INTERRUPT_STATUS_ERR_INTERRUPT (1 << 15) +#define TEGRA_SDMMC_INTERRUPT_STATUS_CMD_TIMEOUT (1 << 16) + +#define TEGRA_SDMMC_INT_STAT_EN 0x034 +#define TEGRA_SDMMC_INT_STAT_EN_CMD_COMPLETE (1 << 0) +#define TEGRA_SDMMC_INT_STAT_EN_XFER_COMPLETE (1 << 1) +#define TEGRA_SDMMC_INT_STAT_EN_DMA_INTERRUPT (1 << 3) +#define TEGRA_SDMMC_INT_STAT_EN_BUFFER_WRITE_READY (1 << 4) +#define TEGRA_SDMMC_INT_STAT_EN_BUFFER_READ_READY (1 << 5) + +#define TEGRA_SDMMC_INT_SIG_EN 0x038 +#define TEGRA_SDMMC_INT_SIG_EN_XFER_COMPLETE (1 << 1) + +struct tegra_sdmmc_host { + struct mci_host mci; + void __iomem *regs; + struct clk *clk; + int gpio_cd, gpio_pwr; +}; +#define to_tegra_sdmmc_host(mci) container_of(mci, struct tegra_sdmmc_host, mci) + +static int tegra_sdmmc_wait_inhibit(struct tegra_sdmmc_host *host, + struct mci_cmd *cmd, struct mci_data *data, + unsigned int timeout) +{ + u32 val = TEGRA_SDMMC_PRESENT_STATE_CMD_INHIBIT_CMD; + + /* + * We shouldn't wait for data inhibit for stop commands, even + * though they might use busy signaling + */ + if ((data == NULL) && (cmd->resp_type & MMC_RSP_BUSY)) + val |= TEGRA_SDMMC_PRESENT_STATE_CMD_INHIBIT_DAT; + + wait_on_timeout(timeout * MSECOND, + !(readl(host->regs + TEGRA_SDMMC_PRESENT_STATE) & val)); + + return 0; +} + +static int tegra_sdmmc_send_cmd(struct mci_host *mci, struct mci_cmd *cmd, + struct mci_data *data) +{ + struct tegra_sdmmc_host *host = to_tegra_sdmmc_host(mci); + u32 val = 0; + int ret; + + ret = tegra_sdmmc_wait_inhibit(host, cmd, data, 10); + if (ret < 0) + return ret; + + /* Set up for a data transfer if we have one */ + if (data) { + if (data->flags & MMC_DATA_WRITE) { + dma_flush_range((unsigned long)data->src, + (unsigned long)(data->src + + data->blocks * 512)); + writel((u32)data->src, host->regs + SDHCI_DMA_ADDRESS); + } else { + dma_clean_range((unsigned long)data->src, + (unsigned long)(data->src + + data->blocks * 512)); + writel((u32)data->dest, host->regs + SDHCI_DMA_ADDRESS); + } + + writel((7 << 12) | data->blocks << 16 | data->blocksize, + host->regs + SDHCI_BLOCK_SIZE__BLOCK_COUNT); + } + + writel(cmd->cmdarg, host->regs + SDHCI_ARGUMENT); + + if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY)) + return -1; + + if (data) { + if (data->blocks > 1) + val |= TRANSFER_MODE_MSBSEL; + + if (data->flags & MMC_DATA_READ) + val |= TRANSFER_MODE_DTDSEL; + + val |= TRANSFER_MODE_DMAEN | TRANSFER_MODE_BCEN; + } + + if (!(cmd->resp_type & MMC_RSP_PRESENT)) + val |= COMMAND_RSPTYP_NONE; + else if (cmd->resp_type & MMC_RSP_136) + val |= COMMAND_RSPTYP_136; + else if (cmd->resp_type & MMC_RSP_BUSY) + val |= COMMAND_RSPTYP_48_BUSY; + else + val |= COMMAND_RSPTYP_48; + + if (cmd->resp_type & MMC_RSP_CRC) + val |= COMMAND_CCCEN; + if (cmd->resp_type & MMC_RSP_OPCODE) + val |= COMMAND_CICEN; + + if (data) + val |= COMMAND_DPSEL; + + writel(COMMAND_CMD(cmd->cmdidx) | val, + host->regs + SDHCI_TRANSFER_MODE__COMMAND); + + ret = wait_on_timeout(100 * MSECOND, + (val = readl(host->regs + SDHCI_INT_STATUS)) + & IRQSTAT_CC); + + if (ret) { + writel(val, host->regs + SDHCI_INT_STATUS); + return ret; + } + + if ((val & IRQSTAT_CC) && !data) + writel(val, host->regs + SDHCI_INT_STATUS); + + + if (val & TEGRA_SDMMC_INTERRUPT_STATUS_CMD_TIMEOUT) { + /* Timeout Error */ + pr_debug("timeout: %08x cmd %d\n", val, cmd->cmdidx); + writel(val, host->regs + SDHCI_INT_STATUS); + return -ETIMEDOUT; + } else if (val & TEGRA_SDMMC_INTERRUPT_STATUS_ERR_INTERRUPT) { + /* Error Interrupt */ + pr_debug("error: %08x cmd %d\n", val, cmd->cmdidx); + writel(val, host->regs + SDHCI_INT_STATUS); + return -1; + } + + if (cmd->resp_type & MMC_RSP_PRESENT) { + if (cmd->resp_type & MMC_RSP_136) { + u32 cmdrsp[4]; + + cmdrsp[3] = readl(host->regs + SDHCI_RESPONSE_3); + cmdrsp[2] = readl(host->regs + SDHCI_RESPONSE_2); + cmdrsp[1] = readl(host->regs + SDHCI_RESPONSE_1); + cmdrsp[0] = readl(host->regs + SDHCI_RESPONSE_0); + cmd->response[0] = (cmdrsp[3] << 8) | (cmdrsp[2] >> 24); + cmd->response[1] = (cmdrsp[2] << 8) | (cmdrsp[1] >> 24); + cmd->response[2] = (cmdrsp[1] << 8) | (cmdrsp[0] >> 24); + cmd->response[3] = (cmdrsp[0] << 8); + } else if (cmd->resp_type & MMC_RSP_BUSY) { + ret = wait_on_timeout(100 * MSECOND, + readl(host->regs + TEGRA_SDMMC_PRESENT_STATE) + & (1 << 20)); + + if (ret) { + pr_err("ard is still busy\n"); + writel(val, host->regs + SDHCI_INT_STATUS); + return ret; + } + + cmd->response[0] = readl(host->regs + SDHCI_RESPONSE_0); + } else { + cmd->response[0] = readl(host->regs + SDHCI_RESPONSE_0); + } + } + + if (data) { + uint64_t start = get_time_ns(); + + while (1) { + val = readl(host->regs + SDHCI_INT_STATUS); + + if (val & TEGRA_SDMMC_INTERRUPT_STATUS_ERR_INTERRUPT) { + /* Error Interrupt */ + writel(val, host->regs + SDHCI_INT_STATUS); + dev_err(mci->hw_dev, + "error during transfer: 0x%08x\n", val); + return -1; + } else if (val & IRQSTAT_DINT) { + /* + * DMA Interrupt, restart the transfer where + * it was interrupted. + */ + u32 address = readl(host->regs + + SDHCI_DMA_ADDRESS); + + writel(IRQSTAT_DINT, + host->regs + SDHCI_INT_STATUS); + writel(address, host->regs + SDHCI_DMA_ADDRESS); + } else if (val & IRQSTAT_TC) { + /* Transfer Complete */; + break; + } else if (is_timeout(start, 2 * SECOND)) { + writel(val, host->regs + SDHCI_INT_STATUS); + dev_err(mci->hw_dev, "MMC Timeout\n" + " Interrupt status 0x%08x\n" + " Interrupt status enable 0x%08x\n" + " Interrupt signal enable 0x%08x\n" + " Present status 0x%08x\n", + val, + readl(host->regs + SDHCI_INT_ENABLE), + readl(host->regs + SDHCI_SIGNAL_ENABLE), + readl(host->regs + SDHCI_PRESENT_STATE)); + return -1; + } + } + writel(val, host->regs + SDHCI_INT_STATUS); + + if (data->flags & MMC_DATA_READ) { + dma_inv_range((unsigned long)data->dest, + (unsigned long)(data->dest + + data->blocks * 512)); + } + } + + return 0; +} + +static void tegra_sdmmc_set_clock(struct tegra_sdmmc_host *host, u32 clock) +{ + u32 prediv = 1, adjusted_clock = clock, val; + + while (adjusted_clock < 3200000) { + prediv *= 2; + adjusted_clock = clock * prediv * 2; + } + + /* clear clock related bits */ + val = readl(host->regs + TEGRA_SDMMC_CLK_CNTL); + val &= 0xffff0000; + writel(val, host->regs + TEGRA_SDMMC_CLK_CNTL); + + /* set new frequency */ + val |= prediv << 8; + val |= TEGRA_SDMMC_CLK_CNTL_INTERNAL_CLOCK_EN; + writel(val, host->regs + TEGRA_SDMMC_CLK_CNTL); + + clk_set_rate(host->clk, adjusted_clock); + + /* wait for controller to settle */ + wait_on_timeout(10 * MSECOND, + !(readl(host->regs + TEGRA_SDMMC_CLK_CNTL) & + TEGRA_SDMMC_CLK_INTERNAL_CLOCK_STABLE)); + + /* enable card clock */ + val |= TEGRA_SDMMC_CLK_CNTL_SD_CLOCK_EN; + writel(val, host->regs + TEGRA_SDMMC_CLK_CNTL); +} + +static void tegra_sdmmc_set_ios(struct mci_host *mci, struct mci_ios *ios) +{ + struct tegra_sdmmc_host *host = to_tegra_sdmmc_host(mci); + u32 val; + + /* set clock */ + if (ios->clock) + tegra_sdmmc_set_clock(host, ios->clock); + + /* set bus width */ + val = readl(host->regs + TEGRA_SDMMC_PWR_CNTL); + val &= ~(0x21); + + if (ios->bus_width == MMC_BUS_WIDTH_8) + val |= (1 << 5); + else if (ios->bus_width == MMC_BUS_WIDTH_4) + val |= (1 << 1); + + writel(val, host->regs + TEGRA_SDMMC_PWR_CNTL); +} + +static int tegra_sdmmc_init(struct mci_host *mci, struct device_d *dev) +{ + struct tegra_sdmmc_host *host = to_tegra_sdmmc_host(mci); + void __iomem *regs = host->regs; + u32 val; + int ret; + + /* reset controller */ + writel(TEGRA_SDMMC_CLK_CNTL_SW_RESET_FOR_ALL, + regs + TEGRA_SDMMC_CLK_CNTL); + + ret = wait_on_timeout(100 * MSECOND, + !(readl(regs + TEGRA_SDMMC_CLK_CNTL) & + TEGRA_SDMMC_CLK_CNTL_SW_RESET_FOR_ALL)); + if (ret) { + dev_err(dev, "timeout while reset\n"); + return ret; + } + + /* set power */ + val = readl(regs + TEGRA_SDMMC_PWR_CNTL); + val &= ~(0xff << 8); + val |= TEGRA_SDMMC_PWR_CNTL_33_V | TEGRA_SDMMC_PWR_CNTL_SD_BUS; + writel(val, regs + TEGRA_SDMMC_PWR_CNTL); + + /* setup signaling */ + writel(0xffffffff, regs + TEGRA_SDMMC_INT_STAT_EN); + writel(0xffffffff, regs + TEGRA_SDMMC_INT_SIG_EN); + + writel(0xe << 16, regs + TEGRA_SDMMC_CLK_CNTL); + + val = readl(regs + TEGRA_SDMMC_INT_STAT_EN); + val &= ~(0xffff); + val = (TEGRA_SDMMC_INT_STAT_EN_CMD_COMPLETE | + TEGRA_SDMMC_INT_STAT_EN_XFER_COMPLETE | + TEGRA_SDMMC_INT_STAT_EN_DMA_INTERRUPT | + TEGRA_SDMMC_INT_STAT_EN_BUFFER_WRITE_READY | + TEGRA_SDMMC_INT_STAT_EN_BUFFER_READ_READY); + writel(val, regs + TEGRA_SDMMC_INT_STAT_EN); + + val = readl(regs + TEGRA_SDMMC_INT_SIG_EN); + val &= ~(0xffff); + val = TEGRA_SDMMC_INT_SIG_EN_XFER_COMPLETE; + writel(val, regs + TEGRA_SDMMC_INT_SIG_EN); + + tegra_sdmmc_set_clock(host, 400000); + + return 0; +} + +static int tegra_sdmmc_card_present(struct mci_host *mci) +{ + struct tegra_sdmmc_host *host = to_tegra_sdmmc_host(mci); + int ret; + + if (gpio_is_valid(host->gpio_cd)) { + ret = gpio_direction_input(host->gpio_cd); + if (ret) + return 0; + return gpio_get_value(host->gpio_cd) ? 0 : 1; + } + + return !(readl(host->regs + SDHCI_PRESENT_STATE) & PRSSTAT_WPSPL); +} + +static int tegra_sdmmc_detect(struct device_d *dev) +{ + struct tegra_sdmmc_host *host = dev->priv; + + return mci_detect_card(&host->mci); +} + +static void tegra_sdmmc_parse_dt(struct tegra_sdmmc_host *host) +{ + struct device_node *np = host->mci.hw_dev->device_node; + + host->gpio_cd = of_get_named_gpio(np, "cd-gpios", 0); + host->gpio_pwr = of_get_named_gpio(np, "power-gpios", 0); + mci_of_parse(&host->mci); +} + +static int tegra_sdmmc_probe(struct device_d *dev) +{ + struct tegra_sdmmc_host *host; + struct mci_host *mci; + int ret; + + host = xzalloc(sizeof(*host)); + mci = &host->mci; + + host->clk = clk_get(dev, NULL); + if (IS_ERR(host->clk)) + return PTR_ERR(host->clk); + + host->regs = dev_request_mem_region(dev, 0); + if (!host->regs) { + dev_err(dev, "could not get iomem region\n"); + return -ENODEV; + } + + mci->hw_dev = dev; + mci->f_max = 48000000; + mci->f_min = 375000; + tegra_sdmmc_parse_dt(host); + + if (gpio_is_valid(host->gpio_pwr)) { + ret = gpio_request(host->gpio_pwr, "tegra_sdmmc_power"); + if (ret) { + dev_err(dev, "failed to allocate power gpio\n"); + return -ENODEV; + } + gpio_direction_output(host->gpio_pwr, 1); + } + + if (gpio_is_valid(host->gpio_cd)) { + ret = gpio_request(host->gpio_cd, "tegra_sdmmc_cd"); + if (ret) { + dev_err(dev, "failed to allocate cd gpio\n"); + return -ENODEV; + } + gpio_direction_input(host->gpio_cd); + } + + clk_enable(host->clk); + + mci->init = tegra_sdmmc_init; + mci->card_present = tegra_sdmmc_card_present; + mci->set_ios = tegra_sdmmc_set_ios; + mci->send_cmd = tegra_sdmmc_send_cmd; + mci->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195; + mci->host_caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA | + MMC_CAP_MMC_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED_52MHZ | + MMC_CAP_SD_HIGHSPEED; + + dev->priv = host; + dev->detect = tegra_sdmmc_detect; + + return mci_register(&host->mci); +} + +static __maybe_unused struct of_device_id tegra_sdmmc_compatible[] = { + { + .compatible = "nvidia,tegra30-sdhci", + }, { + .compatible = "nvidia,tegra20-sdhci", + }, { + /* sentinel */ + } +}; + +static struct driver_d tegra_sdmmc_driver = { + .name = "tegra-sdmmc", + .probe = tegra_sdmmc_probe, + .of_compatible = DRV_OF_COMPAT(tegra_sdmmc_compatible), +}; +device_platform_driver(tegra_sdmmc_driver); -- 1.8.3.1 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox