--- /dev/null
+/**
+ * SDHCI Controller driver for TI's OMAP SoCs
+ *
+ * Copyright (C) 2017 Texas Instruments
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/delay.h>
+#include <linux/mmc/slot-gpio.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+
+#include "sdhci-pltfm.h"
+
+#define SDHCI_OMAP_CON 0x12c
+#define CON_DW8 BIT(5)
+#define CON_DMA_MASTER BIT(20)
+#define CON_INIT BIT(1)
+#define CON_OD BIT(0)
+
+#define SDHCI_OMAP_CMD 0x20c
+
+#define SDHCI_OMAP_HCTL 0x228
+#define HCTL_SDBP BIT(8)
+#define HCTL_SDVS_SHIFT 9
+#define HCTL_SDVS_MASK (0x7 << HCTL_SDVS_SHIFT)
+#define HCTL_SDVS_33 (0x7 << HCTL_SDVS_SHIFT)
+#define HCTL_SDVS_30 (0x6 << HCTL_SDVS_SHIFT)
+#define HCTL_SDVS_18 (0x5 << HCTL_SDVS_SHIFT)
+
+#define SDHCI_OMAP_SYSCTL 0x22c
+#define SYSCTL_CEN BIT(2)
+#define SYSCTL_CLKD_SHIFT 6
+#define SYSCTL_CLKD_MASK 0x3ff
+
+#define SDHCI_OMAP_STAT 0x230
+
+#define SDHCI_OMAP_IE 0x234
+#define INT_CC_EN BIT(0)
+
+#define SDHCI_OMAP_AC12 0x23c
+#define AC12_V1V8_SIGEN BIT(19)
+
+#define SDHCI_OMAP_CAPA 0x240
+#define CAPA_VS33 BIT(24)
+#define CAPA_VS30 BIT(25)
+#define CAPA_VS18 BIT(26)
+
+#define SDHCI_OMAP_TIMEOUT 1 /* 1 msec */
+
+#define SYSCTL_CLKD_MAX 0x3FF
+
+#define IOV_1V8 1800000 /* 180000 uV */
+#define IOV_3V0 3000000 /* 300000 uV */
+#define IOV_3V3 3300000 /* 330000 uV */
+
+struct sdhci_omap_data {
+ u32 offset;
+};
+
+struct sdhci_omap_host {
+ void __iomem *base;
+ struct device *dev;
+ struct regulator *pbias;
+ bool pbias_enabled;
+ struct sdhci_host *host;
+ u8 bus_mode;
+ u8 power_mode;
+};
+
+static inline u32 sdhci_omap_readl(struct sdhci_omap_host *host,
+ unsigned int offset)
+{
+ return readl(host->base + offset);
+}
+
+static inline void sdhci_omap_writel(struct sdhci_omap_host *host,
+ unsigned int offset, u32 data)
+{
+ writel(data, host->base + offset);
+}
+
+static int sdhci_omap_set_pbias(struct sdhci_omap_host *omap_host,
+ bool power_on, unsigned int iov)
+{
+ int ret;
+ struct device *dev = omap_host->dev;
+
+ if (IS_ERR(omap_host->pbias))
+ return 0;
+
+ if (power_on) {
+ ret = regulator_set_voltage(omap_host->pbias, iov, iov);
+ if (ret) {
+ dev_err(dev, "pbias set voltage failed\n");
+ return ret;
+ }
+
+ if (omap_host->pbias_enabled)
+ return 0;
+
+ ret = regulator_enable(omap_host->pbias);
+ if (ret) {
+ dev_err(dev, "pbias reg enable fail\n");
+ return ret;
+ }
+
+ omap_host->pbias_enabled = true;
+ } else {
+ if (!omap_host->pbias_enabled)
+ return 0;
+
+ ret = regulator_disable(omap_host->pbias);
+ if (ret) {
+ dev_err(dev, "pbias reg disable fail\n");
+ return ret;
+ }
+ omap_host->pbias_enabled = false;
+ }
+
+ return 0;
+}
+
+static int sdhci_omap_enable_iov(struct sdhci_omap_host *omap_host,
+ unsigned int iov)
+{
+ int ret;
+ struct sdhci_host *host = omap_host->host;
+ struct mmc_host *mmc = host->mmc;
+
+ ret = sdhci_omap_set_pbias(omap_host, false, 0);
+ if (ret)
+ return ret;
+
+ if (!IS_ERR(mmc->supply.vqmmc)) {
+ ret = regulator_set_voltage(mmc->supply.vqmmc, iov, iov);
+ if (ret) {
+ dev_err(mmc_dev(mmc), "vqmmc set voltage failed\n");
+ return ret;
+ }
+ }
+
+ ret = sdhci_omap_set_pbias(omap_host, true, iov);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void sdhci_omap_conf_bus_power(struct sdhci_omap_host *omap_host,
+ unsigned char signal_voltage)
+{
+ u32 reg;
+ ktime_t timeout;
+
+ reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL);
+ reg &= ~HCTL_SDVS_MASK;
+
+ if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
+ reg |= HCTL_SDVS_33;
+ else
+ reg |= HCTL_SDVS_18;
+
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);
+
+ reg |= HCTL_SDBP;
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);
+
+ /* wait 1ms */
+ timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
+ while (!(sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL) & HCTL_SDBP)) {
+ if (WARN_ON(ktime_after(ktime_get(), timeout)))
+ return;
+ usleep_range(5, 10);
+ }
+}
+
+static int sdhci_omap_start_signal_voltage_switch(struct mmc_host *mmc,
+ struct mmc_ios *ios)
+{
+ u32 reg;
+ int ret;
+ unsigned int iov;
+ struct sdhci_host *host = mmc_priv(mmc);
+ struct sdhci_pltfm_host *pltfm_host;
+ struct sdhci_omap_host *omap_host;
+ struct device *dev;
+
+ pltfm_host = sdhci_priv(host);
+ omap_host = sdhci_pltfm_priv(pltfm_host);
+ dev = omap_host->dev;
+
+ if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
+ reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
+ if (!(reg & CAPA_VS33))
+ return -EOPNOTSUPP;
+
+ sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);
+
+ reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
+ reg &= ~AC12_V1V8_SIGEN;
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
+
+ iov = IOV_3V3;
+ } else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
+ reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
+ if (!(reg & CAPA_VS18))
+ return -EOPNOTSUPP;
+
+ sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);
+
+ reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
+ reg |= AC12_V1V8_SIGEN;
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
+
+ iov = IOV_1V8;
+ } else {
+ return -EOPNOTSUPP;
+ }
+
+ ret = sdhci_omap_enable_iov(omap_host, iov);
+ if (ret) {
+ dev_err(dev, "failed to switch IO voltage to %dmV\n", iov);
+ return ret;
+ }
+
+ dev_dbg(dev, "IO voltage switched to %dmV\n", iov);
+ return 0;
+}
+
+static void sdhci_omap_set_bus_mode(struct sdhci_omap_host *omap_host,
+ unsigned int mode)
+{
+ u32 reg;
+
+ if (omap_host->bus_mode == mode)
+ return;
+
+ reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
+ if (mode == MMC_BUSMODE_OPENDRAIN)
+ reg |= CON_OD;
+ else
+ reg &= ~CON_OD;
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
+
+ omap_host->bus_mode = mode;
+}
+
+void sdhci_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+ struct sdhci_pltfm_host *pltfm_host;
+ struct sdhci_omap_host *omap_host;
+
+ pltfm_host = sdhci_priv(host);
+ omap_host = sdhci_pltfm_priv(pltfm_host);
+
+ sdhci_omap_set_bus_mode(omap_host, ios->bus_mode);
+ sdhci_set_ios(mmc, ios);
+}
+
+static u16 sdhci_omap_calc_divisor(struct sdhci_pltfm_host *host,
+ unsigned int clock)
+{
+ u16 dsor;
+
+ dsor = DIV_ROUND_UP(clk_get_rate(host->clk), clock);
+ if (dsor > SYSCTL_CLKD_MAX)
+ dsor = SYSCTL_CLKD_MAX;
+
+ return dsor;
+}
+
+static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host)
+{
+ u32 reg;
+
+ reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
+ reg |= SYSCTL_CEN;
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
+}
+
+static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host)
+{
+ u32 reg;
+
+ reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
+ reg &= ~SYSCTL_CEN;
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
+}
+
+static void sdhci_omap_set_clock(struct sdhci_host *host, unsigned int clock)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
+ unsigned long clkdiv;
+
+ sdhci_omap_stop_clock(omap_host);
+
+ if (!clock)
+ return;
+
+ clkdiv = sdhci_omap_calc_divisor(pltfm_host, clock);
+ clkdiv = (clkdiv & SYSCTL_CLKD_MASK) << SYSCTL_CLKD_SHIFT;
+ sdhci_enable_clk(host, clkdiv);
+
+ sdhci_omap_start_clock(omap_host);
+}
+
+void sdhci_omap_set_power(struct sdhci_host *host, unsigned char mode,
+ unsigned short vdd)
+{
+ struct mmc_host *mmc = host->mmc;
+
+ mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
+}
+
+static int sdhci_omap_enable_dma(struct sdhci_host *host)
+{
+ u32 reg;
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
+
+ reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
+ reg |= CON_DMA_MASTER;
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
+
+ return 0;
+}
+
+unsigned int sdhci_omap_get_min_clock(struct sdhci_host *host)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+
+ return clk_get_rate(pltfm_host->clk) / SYSCTL_CLKD_MAX;
+}
+
+static void sdhci_omap_set_bus_width(struct sdhci_host *host, int width)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
+ u32 reg;
+
+ reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
+ if (width == MMC_BUS_WIDTH_8)
+ reg |= CON_DW8;
+ else
+ reg &= ~CON_DW8;
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
+
+ sdhci_set_bus_width(host, width);
+}
+
+static void sdhci_omap_init_74_clocks(struct sdhci_host *host, u8 power_mode)
+{
+ u32 reg;
+ ktime_t timeout;
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
+
+ if (omap_host->power_mode == power_mode)
+ return;
+
+ if (power_mode != MMC_POWER_ON)
+ return;
+
+ disable_irq(host->irq);
+
+ reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
+ reg |= CON_INIT;
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_CMD, 0x0);
+
+ /* wait 1ms */
+ timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
+ while (!(sdhci_omap_readl(omap_host, SDHCI_OMAP_STAT) & INT_CC_EN)) {
+ if (WARN_ON(ktime_after(ktime_get(), timeout)))
+ return;
+ usleep_range(5, 10);
+ }
+
+ reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
+ reg &= ~CON_INIT;
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_STAT, INT_CC_EN);
+
+ enable_irq(host->irq);
+
+ omap_host->power_mode = power_mode;
+}
+
+static struct sdhci_ops sdhci_omap_ops = {
+ .set_clock = sdhci_omap_set_clock,
+ .set_power = sdhci_omap_set_power,
+ .enable_dma = sdhci_omap_enable_dma,
+ .get_max_clock = sdhci_pltfm_clk_get_max_clock,
+ .get_min_clock = sdhci_omap_get_min_clock,
+ .set_bus_width = sdhci_omap_set_bus_width,
+ .platform_send_init_74_clocks = sdhci_omap_init_74_clocks,
+ .reset = sdhci_reset,
+ .set_uhs_signaling = sdhci_set_uhs_signaling,
+};
+
+static int sdhci_omap_set_capabilities(struct sdhci_omap_host *omap_host)
+{
+ u32 reg;
+ int ret = 0;
+ struct device *dev = omap_host->dev;
+ struct regulator *vqmmc;
+
+ vqmmc = regulator_get(dev, "vqmmc");
+ if (IS_ERR(vqmmc)) {
+ ret = PTR_ERR(vqmmc);
+ goto reg_put;
+ }
+
+ /* voltage capabilities might be set by boot loader, clear it */
+ reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
+ reg &= ~(CAPA_VS18 | CAPA_VS30 | CAPA_VS33);
+
+ if (regulator_is_supported_voltage(vqmmc, IOV_3V3, IOV_3V3))
+ reg |= CAPA_VS33;
+ if (regulator_is_supported_voltage(vqmmc, IOV_1V8, IOV_1V8))
+ reg |= CAPA_VS18;
+
+ sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, reg);
+
+reg_put:
+ regulator_put(vqmmc);
+
+ return ret;
+}
+
+static const struct sdhci_pltfm_data sdhci_omap_pdata = {
+ .quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
+ SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
+ SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
+ SDHCI_QUIRK_NO_HISPD_BIT |
+ SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
+ .quirks2 = SDHCI_QUIRK2_NO_1_8_V |
+ SDHCI_QUIRK2_ACMD23_BROKEN |
+ SDHCI_QUIRK2_RSP_136_HAS_CRC,
+ .ops = &sdhci_omap_ops,
+};
+
+static const struct sdhci_omap_data dra7_data = {
+ .offset = 0x200,
+};
+
+static const struct of_device_id omap_sdhci_match[] = {
+ { .compatible = "ti,dra7-sdhci", .data = &dra7_data },
+ {},
+};
+MODULE_DEVICE_TABLE(of, omap_sdhci_match);
+
+static int sdhci_omap_probe(struct platform_device *pdev)
+{
+ int ret;
+ u32 offset;
+ struct device *dev = &pdev->dev;
+ struct sdhci_host *host;
+ struct sdhci_pltfm_host *pltfm_host;
+ struct sdhci_omap_host *omap_host;
+ struct mmc_host *mmc;
+ const struct of_device_id *match;
+ struct sdhci_omap_data *data;
+
+ match = of_match_device(omap_sdhci_match, dev);
+ if (!match)
+ return -EINVAL;
+
+ data = (struct sdhci_omap_data *)match->data;
+ if (!data) {
+ dev_err(dev, "no sdhci omap data\n");
+ return -EINVAL;
+ }
+ offset = data->offset;
+
+ host = sdhci_pltfm_init(pdev, &sdhci_omap_pdata,
+ sizeof(*omap_host));
+ if (IS_ERR(host)) {
+ dev_err(dev, "Failed sdhci_pltfm_init\n");
+ return PTR_ERR(host);
+ }
+
+ pltfm_host = sdhci_priv(host);
+ omap_host = sdhci_pltfm_priv(pltfm_host);
+ omap_host->host = host;
+ omap_host->base = host->ioaddr;
+ omap_host->dev = dev;
+ host->ioaddr += offset;
+
+ mmc = host->mmc;
+ ret = mmc_of_parse(mmc);
+ if (ret)
+ goto err_pltfm_free;
+
+ pltfm_host->clk = devm_clk_get(dev, "fck");
+ if (IS_ERR(pltfm_host->clk)) {
+ ret = PTR_ERR(pltfm_host->clk);
+ goto err_pltfm_free;
+ }
+
+ ret = clk_set_rate(pltfm_host->clk, mmc->f_max);
+ if (ret) {
+ dev_err(dev, "failed to set clock to %d\n", mmc->f_max);
+ goto err_pltfm_free;
+ }
+
+ omap_host->pbias = devm_regulator_get_optional(dev, "pbias");
+ if (IS_ERR(omap_host->pbias)) {
+ ret = PTR_ERR(omap_host->pbias);
+ if (ret != -ENODEV)
+ goto err_pltfm_free;
+ dev_dbg(dev, "unable to get pbias regulator %d\n", ret);
+ }
+ omap_host->pbias_enabled = false;
+
+ /*
+ * omap_device_pm_domain has callbacks to enable the main
+ * functional clock, interface clock and also configure the
+ * SYSCONFIG register of omap devices. The callback will be invoked
+ * as part of pm_runtime_get_sync.
+ */
+ pm_runtime_enable(dev);
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ dev_err(dev, "pm_runtime_get_sync failed\n");
+ pm_runtime_put_noidle(dev);
+ goto err_rpm_disable;
+ }
+
+ ret = sdhci_omap_set_capabilities(omap_host);
+ if (ret) {
+ dev_err(dev, "failed to set system capabilities\n");
+ goto err_put_sync;
+ }
+
+ host->mmc_host_ops.get_ro = mmc_gpio_get_ro;
+ host->mmc_host_ops.start_signal_voltage_switch =
+ sdhci_omap_start_signal_voltage_switch;
+ host->mmc_host_ops.set_ios = sdhci_omap_set_ios;
+
+ sdhci_read_caps(host);
+ host->caps |= SDHCI_CAN_DO_ADMA2;
+
+ ret = sdhci_add_host(host);
+ if (ret)
+ goto err_put_sync;
+
+ return 0;
+
+err_put_sync:
+ pm_runtime_put_sync(dev);
+
+err_rpm_disable:
+ pm_runtime_disable(dev);
+
+err_pltfm_free:
+ sdhci_pltfm_free(pdev);
+ return ret;
+}
+
+static int sdhci_omap_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct sdhci_host *host = platform_get_drvdata(pdev);
+
+ sdhci_remove_host(host, true);
+ pm_runtime_put_sync(dev);
+ pm_runtime_disable(dev);
+ sdhci_pltfm_free(pdev);
+
+ return 0;
+}
+
+static struct platform_driver sdhci_omap_driver = {
+ .probe = sdhci_omap_probe,
+ .remove = sdhci_omap_remove,
+ .driver = {
+ .name = "sdhci-omap",
+ .of_match_table = omap_sdhci_match,
+ },
+};
+
+module_platform_driver(sdhci_omap_driver);
+
+MODULE_DESCRIPTION("SDHCI driver for OMAP SoCs");
+MODULE_AUTHOR("Texas Instruments Inc.");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:sdhci_omap");
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