From 132f10746c2bb2e4bcfc3fadff12f390ace2d183 Mon Sep 17 00:00:00 2001 From: Vipin Bhandari Date: Fri, 5 Mar 2010 13:43:21 -0800 Subject: [PATCH] davinci: MMC: add support for 8bit MMC cards Add support for 8bit MMC cards. The controller data width is configurable depending on the wires setting in the platform data structure. MMC 8bit is tested on OMAPL137 and MMC 4bit is tested on OMAPL138 EVM. Signed-off-by: Vipin Bhandari Cc: David Brownell Cc: Chaithrika U S Cc: Sudhakar Rajashekhara Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/mmc/host/davinci_mmc.c | 45 ++++++++++++++++++++++++++++++++---------- 1 file changed, 35 insertions(+), 10 deletions(-) diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c index dd45e7c..3bd0ba2 100644 --- a/drivers/mmc/host/davinci_mmc.c +++ b/drivers/mmc/host/davinci_mmc.c @@ -73,6 +73,7 @@ /* DAVINCI_MMCCTL definitions */ #define MMCCTL_DATRST (1 << 0) #define MMCCTL_CMDRST (1 << 1) +#define MMCCTL_WIDTH_8_BIT (1 << 8) #define MMCCTL_WIDTH_4_BIT (1 << 2) #define MMCCTL_DATEG_DISABLED (0 << 6) #define MMCCTL_DATEG_RISING (1 << 6) @@ -791,22 +792,42 @@ static void calculate_clk_divider(struct mmc_host *mmc, struct mmc_ios *ios) static void mmc_davinci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { - unsigned int mmc_pclk = 0; struct mmc_davinci_host *host = mmc_priv(mmc); - mmc_pclk = host->mmc_input_clk; dev_dbg(mmc_dev(host->mmc), "clock %dHz busmode %d powermode %d Vdd %04x\n", ios->clock, ios->bus_mode, ios->power_mode, ios->vdd); - if (ios->bus_width == MMC_BUS_WIDTH_4) { - dev_dbg(mmc_dev(host->mmc), "Enabling 4 bit mode\n"); - writel(readl(host->base + DAVINCI_MMCCTL) | MMCCTL_WIDTH_4_BIT, - host->base + DAVINCI_MMCCTL); - } else { - dev_dbg(mmc_dev(host->mmc), "Disabling 4 bit mode\n"); - writel(readl(host->base + DAVINCI_MMCCTL) & ~MMCCTL_WIDTH_4_BIT, + + switch (ios->bus_width) { + case MMC_BUS_WIDTH_8: + dev_dbg(mmc_dev(host->mmc), "Enabling 8 bit mode\n"); + writel((readl(host->base + DAVINCI_MMCCTL) & + ~MMCCTL_WIDTH_4_BIT) | MMCCTL_WIDTH_8_BIT, host->base + DAVINCI_MMCCTL); + break; + case MMC_BUS_WIDTH_4: + dev_dbg(mmc_dev(host->mmc), "Enabling 4 bit mode\n"); + if (host->version == MMC_CTLR_VERSION_2) + writel((readl(host->base + DAVINCI_MMCCTL) & + ~MMCCTL_WIDTH_8_BIT) | MMCCTL_WIDTH_4_BIT, + host->base + DAVINCI_MMCCTL); + else + writel(readl(host->base + DAVINCI_MMCCTL) | + MMCCTL_WIDTH_4_BIT, + host->base + DAVINCI_MMCCTL); + break; + case MMC_BUS_WIDTH_1: + dev_dbg(mmc_dev(host->mmc), "Enabling 1 bit mode\n"); + if (host->version == MMC_CTLR_VERSION_2) + writel(readl(host->base + DAVINCI_MMCCTL) & + ~(MMCCTL_WIDTH_8_BIT | MMCCTL_WIDTH_4_BIT), + host->base + DAVINCI_MMCCTL); + else + writel(readl(host->base + DAVINCI_MMCCTL) & + ~MMCCTL_WIDTH_4_BIT, + host->base + DAVINCI_MMCCTL); + break; } calculate_clk_divider(mmc, ios); @@ -1189,10 +1210,14 @@ static int __init davinci_mmcsd_probe(struct platform_device *pdev) /* REVISIT: someday, support IRQ-driven card detection. */ mmc->caps |= MMC_CAP_NEEDS_POLL; + mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY; - if (!pdata || pdata->wires == 4 || pdata->wires == 0) + if (pdata && (pdata->wires == 4 || pdata->wires == 0)) mmc->caps |= MMC_CAP_4_BIT_DATA; + if (pdata && (pdata->wires == 8)) + mmc->caps |= (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA); + host->version = pdata->version; mmc->ops = &mmc_davinci_ops; -- 2.7.4