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mmc: sdhci-tegra: Explicitly support Tegra30
Tegra30 differs from Tegra20 in a number of ways. This patch implements a minimal set of differences in order to get the Cardhu board's SD slot and eMMC working. Given the diffs between the mainline sdhci-tegra.c and our downstream versions, I expect we'll eventually need to add many more differences, hence the seemingly heavy-weight addition of the soc_data structure. * Tegra30 doesn't need to override register access to SDHCI_HOST_VERSION or SDHCI_INT_ENABLE. * Tegra30 needs quirk SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Chris Ball <cjb@laptop.org>
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192b537242
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@ -19,6 +19,7 @@
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/gpio.h>
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#include <linux/mmc/card.h>
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@ -32,6 +33,19 @@
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#include "sdhci-pltfm.h"
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#define NVQUIRK_FORCE_SDHCI_SPEC_200 BIT(0)
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#define NVQUIRK_ENABLE_BLOCK_GAP_DET BIT(1)
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struct sdhci_tegra_soc_data {
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struct sdhci_pltfm_data *pdata;
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u32 nvquirks;
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};
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struct sdhci_tegra {
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const struct tegra_sdhci_platform_data *plat;
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const struct sdhci_tegra_soc_data *soc_data;
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};
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static u32 tegra_sdhci_readl(struct sdhci_host *host, int reg)
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{
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u32 val;
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@ -47,7 +61,12 @@ static u32 tegra_sdhci_readl(struct sdhci_host *host, int reg)
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static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
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{
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if (unlikely(reg == SDHCI_HOST_VERSION)) {
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct sdhci_tegra *tegra_host = pltfm_host->priv;
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const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
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if (unlikely((soc_data->nvquirks & NVQUIRK_FORCE_SDHCI_SPEC_200) &&
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(reg == SDHCI_HOST_VERSION))) {
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/* Erratum: Version register is invalid in HW. */
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return SDHCI_SPEC_200;
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}
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@ -57,6 +76,10 @@ static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
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static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
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{
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct sdhci_tegra *tegra_host = pltfm_host->priv;
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const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
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/* Seems like we're getting spurious timeout and crc errors, so
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* disable signalling of them. In case of real errors software
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* timers should take care of eventually detecting them.
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@ -66,7 +89,8 @@ static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
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writel(val, host->ioaddr + reg);
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if (unlikely(reg == SDHCI_INT_ENABLE)) {
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if (unlikely((soc_data->nvquirks & NVQUIRK_ENABLE_BLOCK_GAP_DET) &&
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(reg == SDHCI_INT_ENABLE))) {
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/* Erratum: Must enable block gap interrupt detection */
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u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
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if (val & SDHCI_INT_CARD_INT)
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@ -77,10 +101,11 @@ static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
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}
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}
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static unsigned int tegra_sdhci_get_ro(struct sdhci_host *sdhci)
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static unsigned int tegra_sdhci_get_ro(struct sdhci_host *host)
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{
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(sdhci);
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struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct sdhci_tegra *tegra_host = pltfm_host->priv;
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const struct tegra_sdhci_platform_data *plat = tegra_host->plat;
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if (!gpio_is_valid(plat->wp_gpio))
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return -1;
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@ -99,7 +124,8 @@ static irqreturn_t carddetect_irq(int irq, void *data)
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static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
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{
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
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struct sdhci_tegra *tegra_host = pltfm_host->priv;
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const struct tegra_sdhci_platform_data *plat = tegra_host->plat;
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u32 ctrl;
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ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
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@ -125,7 +151,8 @@ static struct sdhci_ops tegra_sdhci_ops = {
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.platform_8bit_width = tegra_sdhci_8bit,
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};
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static struct sdhci_pltfm_data sdhci_tegra_pdata = {
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#ifdef CONFIG_ARCH_TEGRA_2x_SOC
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static struct sdhci_pltfm_data sdhci_tegra20_pdata = {
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.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
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SDHCI_QUIRK_SINGLE_POWER_WRITE |
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SDHCI_QUIRK_NO_HISPD_BIT |
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@ -133,8 +160,35 @@ static struct sdhci_pltfm_data sdhci_tegra_pdata = {
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.ops = &tegra_sdhci_ops,
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};
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static struct sdhci_tegra_soc_data soc_data_tegra20 = {
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.pdata = &sdhci_tegra20_pdata,
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.nvquirks = NVQUIRK_FORCE_SDHCI_SPEC_200 |
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NVQUIRK_ENABLE_BLOCK_GAP_DET,
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};
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#endif
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#ifdef CONFIG_ARCH_TEGRA_3x_SOC
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static struct sdhci_pltfm_data sdhci_tegra30_pdata = {
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.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
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SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
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SDHCI_QUIRK_SINGLE_POWER_WRITE |
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SDHCI_QUIRK_NO_HISPD_BIT |
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SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
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.ops = &tegra_sdhci_ops,
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};
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static struct sdhci_tegra_soc_data soc_data_tegra30 = {
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.pdata = &sdhci_tegra30_pdata,
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};
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#endif
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static const struct of_device_id sdhci_tegra_dt_match[] __devinitdata = {
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{ .compatible = "nvidia,tegra20-sdhci", },
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#ifdef CONFIG_ARCH_TEGRA_3x_SOC
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{ .compatible = "nvidia,tegra30-sdhci", .data = &soc_data_tegra30 },
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#endif
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#ifdef CONFIG_ARCH_TEGRA_2x_SOC
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{ .compatible = "nvidia,tegra20-sdhci", .data = &soc_data_tegra20 },
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#endif
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{}
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};
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MODULE_DEVICE_TABLE(of, sdhci_dt_ids);
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@ -165,13 +219,22 @@ static struct tegra_sdhci_platform_data * __devinit sdhci_tegra_dt_parse_pdata(
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static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
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{
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const struct of_device_id *match;
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const struct sdhci_tegra_soc_data *soc_data;
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struct sdhci_host *host;
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struct sdhci_pltfm_host *pltfm_host;
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struct tegra_sdhci_platform_data *plat;
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struct sdhci_host *host;
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struct sdhci_tegra *tegra_host;
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struct clk *clk;
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int rc;
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host = sdhci_pltfm_init(pdev, &sdhci_tegra_pdata);
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match = of_match_device(sdhci_tegra_dt_match, &pdev->dev);
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if (match)
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soc_data = match->data;
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else
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soc_data = &soc_data_tegra20;
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host = sdhci_pltfm_init(pdev, soc_data->pdata);
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if (IS_ERR(host))
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return PTR_ERR(host);
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@ -188,7 +251,17 @@ static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
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goto err_no_plat;
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}
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pltfm_host->priv = plat;
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tegra_host = devm_kzalloc(&pdev->dev, sizeof(*tegra_host), GFP_KERNEL);
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if (!tegra_host) {
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dev_err(mmc_dev(host->mmc), "failed to allocate tegra_host\n");
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rc = -ENOMEM;
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goto err_no_plat;
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}
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tegra_host->plat = plat;
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tegra_host->soc_data = soc_data;
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pltfm_host->priv = tegra_host;
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if (gpio_is_valid(plat->power_gpio)) {
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rc = gpio_request(plat->power_gpio, "sdhci_power");
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@ -284,7 +357,8 @@ static int __devexit sdhci_tegra_remove(struct platform_device *pdev)
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{
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struct sdhci_host *host = platform_get_drvdata(pdev);
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
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struct sdhci_tegra *tegra_host = pltfm_host->priv;
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const struct tegra_sdhci_platform_data *plat = tegra_host->plat;
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int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
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sdhci_remove_host(host, dead);
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@ -327,5 +401,5 @@ static struct platform_driver sdhci_tegra_driver = {
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module_platform_driver(sdhci_tegra_driver);
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MODULE_DESCRIPTION("SDHCI driver for Tegra");
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MODULE_AUTHOR(" Google, Inc.");
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MODULE_AUTHOR("Google, Inc.");
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MODULE_LICENSE("GPL v2");
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