From 95f25efe0ce22e28d61722d655d2ef582f5f7520 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Fri, 15 Oct 2010 12:21:04 +0200 Subject: mmc: sdhci-pltfm: add -pltfm driver for imx35/51 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This driver adds basic support for the esdhc-core found on e.g. imx35/51, as a platform driver. Signed-off-by: Wolfram Sang Acked-by: Anton Vorontsov Tested-by: Eric Bénard Signed-off-by: Chris Ball --- drivers/mmc/host/Kconfig | 10 +++ drivers/mmc/host/Makefile | 1 + drivers/mmc/host/sdhci-esdhc-imx.c | 143 +++++++++++++++++++++++++++++++++++++ drivers/mmc/host/sdhci-pltfm.c | 3 + drivers/mmc/host/sdhci-pltfm.h | 1 + 5 files changed, 158 insertions(+) create mode 100644 drivers/mmc/host/sdhci-esdhc-imx.c (limited to 'drivers') diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index 0b7024a4ffc2..c9c2520a0c4a 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -130,6 +130,16 @@ config MMC_SDHCI_CNS3XXX If unsure, say N. +config MMC_SDHCI_ESDHC_IMX + bool "SDHCI platform support for the Freescale eSDHC i.MX controller" + depends on MMC_SDHCI_PLTFM && (ARCH_MX25 || ARCH_MX35 || ARCH_MX5) + select MMC_SDHCI_IO_ACCESSORS + help + This selects the Freescale eSDHC controller support on the platform + bus, found on platforms like mx35/51. + + If unsure, say N. + config MMC_SDHCI_S3C tristate "SDHCI support on Samsung S3C SoC" depends on MMC_SDHCI && PLAT_SAMSUNG diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index eae5d62711f7..6c4ac67f739f 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_MMC_USHC) += ushc.o obj-$(CONFIG_MMC_SDHCI_PLTFM) += sdhci-platform.o sdhci-platform-y := sdhci-pltfm.o sdhci-platform-$(CONFIG_MMC_SDHCI_CNS3XXX) += sdhci-cns3xxx.o +sdhci-platform-$(CONFIG_MMC_SDHCI_ESDHC_IMX) += sdhci-esdhc-imx.o obj-$(CONFIG_MMC_SDHCI_OF) += sdhci-of.o sdhci-of-y := sdhci-of-core.o diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c new file mode 100644 index 000000000000..2e9cca19c90b --- /dev/null +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -0,0 +1,143 @@ +/* + * Freescale eSDHC i.MX controller driver for the platform bus. + * + * derived from the OF-version. + * + * Copyright (c) 2010 Pengutronix e.K. + * Author: Wolfram Sang + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License. + */ + +#include +#include +#include +#include +#include +#include +#include "sdhci.h" +#include "sdhci-pltfm.h" +#include "sdhci-esdhc.h" + +static inline void esdhc_clrset_le(struct sdhci_host *host, u32 mask, u32 val, int reg) +{ + void __iomem *base = host->ioaddr + (reg & ~0x3); + u32 shift = (reg & 0x3) * 8; + + writel(((readl(base) & ~(mask << shift)) | (val << shift)), base); +} + +static u16 esdhc_readw_le(struct sdhci_host *host, int reg) +{ + if (unlikely(reg == SDHCI_HOST_VERSION)) + reg ^= 2; + + return readw(host->ioaddr + reg); +} + +static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + + switch (reg) { + case SDHCI_TRANSFER_MODE: + /* + * Postpone this write, we must do it together with a + * command write that is down below. + */ + pltfm_host->scratchpad = val; + return; + case SDHCI_COMMAND: + writel(val << 16 | pltfm_host->scratchpad, + host->ioaddr + SDHCI_TRANSFER_MODE); + return; + case SDHCI_BLOCK_SIZE: + val &= ~SDHCI_MAKE_BLKSZ(0x7, 0); + break; + } + esdhc_clrset_le(host, 0xffff, val, reg); +} + +static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg) +{ + u32 new_val; + + switch (reg) { + case SDHCI_POWER_CONTROL: + /* + * FSL put some DMA bits here + * If your board has a regulator, code should be here + */ + return; + case SDHCI_HOST_CONTROL: + /* FSL messed up here, so we can just keep those two */ + new_val = val & (SDHCI_CTRL_LED | SDHCI_CTRL_4BITBUS); + /* ensure the endianess */ + new_val |= ESDHC_HOST_CONTROL_LE; + /* DMA mode bits are shifted */ + new_val |= (val & SDHCI_CTRL_DMA_MASK) << 5; + + esdhc_clrset_le(host, 0xffff, new_val, reg); + return; + } + esdhc_clrset_le(host, 0xff, val, reg); +} + +static unsigned int esdhc_pltfm_get_max_clock(struct sdhci_host *host) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + + return clk_get_rate(pltfm_host->clk); +} + +static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + + return clk_get_rate(pltfm_host->clk) / 256 / 16; +} + +static int esdhc_pltfm_init(struct sdhci_host *host, struct sdhci_pltfm_data *pdata) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct clk *clk; + + clk = clk_get(mmc_dev(host->mmc), NULL); + if (IS_ERR(clk)) { + dev_err(mmc_dev(host->mmc), "clk err\n"); + return PTR_ERR(clk); + } + clk_enable(clk); + pltfm_host->clk = clk; + + return 0; +} + +static void esdhc_pltfm_exit(struct sdhci_host *host) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + + clk_disable(pltfm_host->clk); + clk_put(pltfm_host->clk); +} + +static struct sdhci_ops sdhci_esdhc_ops = { + .read_w = esdhc_readw_le, + .write_w = esdhc_writew_le, + .write_b = esdhc_writeb_le, + .set_clock = esdhc_set_clock, + .get_max_clock = esdhc_pltfm_get_max_clock, + .get_min_clock = esdhc_pltfm_get_min_clock, +}; + +struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = { + .quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_NO_MULTIBLOCK + | SDHCI_QUIRK_BROKEN_ADMA, + /* ADMA has issues. Might be fixable */ + /* NO_MULTIBLOCK might be MX35 only (Errata: ENGcm07207) */ + .ops = &sdhci_esdhc_ops, + .init = esdhc_pltfm_init, + .exit = esdhc_pltfm_exit, +}; diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c index 00e8a8ab638e..0502f89f662b 100644 --- a/drivers/mmc/host/sdhci-pltfm.c +++ b/drivers/mmc/host/sdhci-pltfm.c @@ -166,6 +166,9 @@ static const struct platform_device_id sdhci_pltfm_ids[] = { { "sdhci", }, #ifdef CONFIG_MMC_SDHCI_CNS3XXX { "sdhci-cns3xxx", (kernel_ulong_t)&sdhci_cns3xxx_pdata }, +#endif +#ifdef CONFIG_MMC_SDHCI_ESDHC_IMX + { "sdhci-esdhc-imx", (kernel_ulong_t)&sdhci_esdhc_imx_pdata }, #endif { }, }; diff --git a/drivers/mmc/host/sdhci-pltfm.h b/drivers/mmc/host/sdhci-pltfm.h index 562b92957f18..c1bfe48af56a 100644 --- a/drivers/mmc/host/sdhci-pltfm.h +++ b/drivers/mmc/host/sdhci-pltfm.h @@ -21,5 +21,6 @@ struct sdhci_pltfm_host { }; extern struct sdhci_pltfm_data sdhci_cns3xxx_pdata; +extern struct sdhci_pltfm_data sdhci_esdhc_imx_pdata; #endif /* _DRIVERS_MMC_SDHCI_PLTFM_H */ -- cgit v1.2.3-58-ga151