diff options
Diffstat (limited to 'drivers/mmc/host/sdhci-milbeaut.c')
| -rw-r--r-- | drivers/mmc/host/sdhci-milbeaut.c | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-milbeaut.c b/drivers/mmc/host/sdhci-milbeaut.c new file mode 100644 index 000000000..148b37ac6 --- /dev/null +++ b/drivers/mmc/host/sdhci-milbeaut.c @@ -0,0 +1,348 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2013 - 2015 Fujitsu Semiconductor, Ltd + * Vincent Yang <vincent.yang@tw.fujitsu.com> + * Copyright (C) 2015 Linaro Ltd Andy Green <andy.green@linaro.org> + * Copyright (C) 2019 Socionext Inc. + * Takao Orito <orito.takao@socionext.com> + */ + +#include <linux/bits.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/property.h> + +#include "sdhci-pltfm.h" +#include "sdhci_f_sdh30.h" + +/* milbeaut bridge controller register */ +#define MLB_SOFT_RESET 0x0200 +#define MLB_SOFT_RESET_RSTX BIT(0) + +#define MLB_WP_CD_LED_SET 0x0210 +#define MLB_WP_CD_LED_SET_LED_INV BIT(2) + +#define MLB_CR_SET 0x0220 +#define MLB_CR_SET_CR_TOCLKUNIT BIT(24) +#define MLB_CR_SET_CR_TOCLKFREQ_SFT (16) +#define MLB_CR_SET_CR_TOCLKFREQ_MASK (0x3F << MLB_CR_SET_CR_TOCLKFREQ_SFT) +#define MLB_CR_SET_CR_BCLKFREQ_SFT (8) +#define MLB_CR_SET_CR_BCLKFREQ_MASK (0xFF << MLB_CR_SET_CR_BCLKFREQ_SFT) +#define MLB_CR_SET_CR_RTUNTIMER_SFT (4) +#define MLB_CR_SET_CR_RTUNTIMER_MASK (0xF << MLB_CR_SET_CR_RTUNTIMER_SFT) + +#define MLB_SD_TOCLK_I_DIV 16 +#define MLB_TOCLKFREQ_UNIT_THRES 16000000 +#define MLB_CAL_TOCLKFREQ_MHZ(rate) (rate / MLB_SD_TOCLK_I_DIV / 1000000) +#define MLB_CAL_TOCLKFREQ_KHZ(rate) (rate / MLB_SD_TOCLK_I_DIV / 1000) +#define MLB_TOCLKFREQ_MAX 63 +#define MLB_TOCLKFREQ_MIN 1 + +#define MLB_SD_BCLK_I_DIV 4 +#define MLB_CAL_BCLKFREQ(rate) (rate / MLB_SD_BCLK_I_DIV / 1000000) +#define MLB_BCLKFREQ_MAX 255 +#define MLB_BCLKFREQ_MIN 1 + +#define MLB_CDR_SET 0x0230 +#define MLB_CDR_SET_CLK2POW16 3 + +struct f_sdhost_priv { + struct clk *clk_iface; + struct clk *clk; + struct device *dev; + bool enable_cmd_dat_delay; +}; + +static void sdhci_milbeaut_soft_voltage_switch(struct sdhci_host *host) +{ + u32 ctrl = 0; + + usleep_range(2500, 3000); + ctrl = sdhci_readl(host, F_SDH30_IO_CONTROL2); + ctrl |= F_SDH30_CRES_O_DN; + sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); + ctrl |= F_SDH30_MSEL_O_1_8; + sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); + + ctrl &= ~F_SDH30_CRES_O_DN; + sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); + usleep_range(2500, 3000); + + ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING); + ctrl |= F_SDH30_CMD_CHK_DIS; + sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING); +} + +static unsigned int sdhci_milbeaut_get_min_clock(struct sdhci_host *host) +{ + return F_SDH30_MIN_CLOCK; +} + +static void sdhci_milbeaut_reset(struct sdhci_host *host, u8 mask) +{ + struct f_sdhost_priv *priv = sdhci_priv(host); + u16 clk; + u32 ctl; + ktime_t timeout; + + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + clk = (clk & ~SDHCI_CLOCK_CARD_EN) | SDHCI_CLOCK_INT_EN; + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); + + sdhci_reset(host, mask); + + clk |= SDHCI_CLOCK_CARD_EN; + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); + + timeout = ktime_add_ms(ktime_get(), 10); + while (1) { + bool timedout = ktime_after(ktime_get(), timeout); + + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + if (clk & SDHCI_CLOCK_INT_STABLE) + break; + if (timedout) { + pr_err("%s: Internal clock never stabilised.\n", + mmc_hostname(host->mmc)); + sdhci_dumpregs(host); + return; + } + udelay(10); + } + + if (priv->enable_cmd_dat_delay) { + ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL); + ctl |= F_SDH30_CMD_DAT_DELAY; + sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL); + } +} + +static const struct sdhci_ops sdhci_milbeaut_ops = { + .voltage_switch = sdhci_milbeaut_soft_voltage_switch, + .get_min_clock = sdhci_milbeaut_get_min_clock, + .reset = sdhci_milbeaut_reset, + .set_clock = sdhci_set_clock, + .set_bus_width = sdhci_set_bus_width, + .set_uhs_signaling = sdhci_set_uhs_signaling, + .set_power = sdhci_set_power_and_bus_voltage, +}; + +static void sdhci_milbeaut_bridge_reset(struct sdhci_host *host, + int reset_flag) +{ + if (reset_flag) + sdhci_writel(host, 0, MLB_SOFT_RESET); + else + sdhci_writel(host, MLB_SOFT_RESET_RSTX, MLB_SOFT_RESET); +} + +static void sdhci_milbeaut_bridge_init(struct sdhci_host *host, + int rate) +{ + u32 val, clk; + + /* IO_SDIO_CR_SET should be set while reset */ + val = sdhci_readl(host, MLB_CR_SET); + val &= ~(MLB_CR_SET_CR_TOCLKFREQ_MASK | MLB_CR_SET_CR_TOCLKUNIT | + MLB_CR_SET_CR_BCLKFREQ_MASK); + if (rate >= MLB_TOCLKFREQ_UNIT_THRES) { + clk = MLB_CAL_TOCLKFREQ_MHZ(rate); + clk = min_t(u32, MLB_TOCLKFREQ_MAX, clk); + val |= MLB_CR_SET_CR_TOCLKUNIT | + (clk << MLB_CR_SET_CR_TOCLKFREQ_SFT); + } else { + clk = MLB_CAL_TOCLKFREQ_KHZ(rate); + clk = min_t(u32, MLB_TOCLKFREQ_MAX, clk); + clk = max_t(u32, MLB_TOCLKFREQ_MIN, clk); + val |= clk << MLB_CR_SET_CR_TOCLKFREQ_SFT; + } + + clk = MLB_CAL_BCLKFREQ(rate); + clk = min_t(u32, MLB_BCLKFREQ_MAX, clk); + clk = max_t(u32, MLB_BCLKFREQ_MIN, clk); + val |= clk << MLB_CR_SET_CR_BCLKFREQ_SFT; + val &= ~MLB_CR_SET_CR_RTUNTIMER_MASK; + sdhci_writel(host, val, MLB_CR_SET); + + sdhci_writel(host, MLB_CDR_SET_CLK2POW16, MLB_CDR_SET); + + sdhci_writel(host, MLB_WP_CD_LED_SET_LED_INV, MLB_WP_CD_LED_SET); +} + +static void sdhci_milbeaut_vendor_init(struct sdhci_host *host) +{ + struct f_sdhost_priv *priv = sdhci_priv(host); + u32 ctl; + + ctl = sdhci_readl(host, F_SDH30_IO_CONTROL2); + ctl |= F_SDH30_CRES_O_DN; + sdhci_writel(host, ctl, F_SDH30_IO_CONTROL2); + ctl &= ~F_SDH30_MSEL_O_1_8; + sdhci_writel(host, ctl, F_SDH30_IO_CONTROL2); + ctl &= ~F_SDH30_CRES_O_DN; + sdhci_writel(host, ctl, F_SDH30_IO_CONTROL2); + + ctl = sdhci_readw(host, F_SDH30_AHB_CONFIG); + ctl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 | + F_SDH30_AHB_INCR_4; + ctl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN); + sdhci_writew(host, ctl, F_SDH30_AHB_CONFIG); + + if (priv->enable_cmd_dat_delay) { + ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL); + ctl |= F_SDH30_CMD_DAT_DELAY; + sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL); + } +} + +static const struct of_device_id mlb_dt_ids[] = { + { + .compatible = "socionext,milbeaut-m10v-sdhci-3.0", + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mlb_dt_ids); + +static void sdhci_milbeaut_init(struct sdhci_host *host) +{ + struct f_sdhost_priv *priv = sdhci_priv(host); + int rate = clk_get_rate(priv->clk); + u16 ctl; + + sdhci_milbeaut_bridge_reset(host, 0); + + ctl = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + ctl &= ~(SDHCI_CLOCK_CARD_EN | SDHCI_CLOCK_INT_EN); + sdhci_writew(host, ctl, SDHCI_CLOCK_CONTROL); + + sdhci_milbeaut_bridge_reset(host, 1); + + sdhci_milbeaut_bridge_init(host, rate); + sdhci_milbeaut_bridge_reset(host, 0); + + sdhci_milbeaut_vendor_init(host); +} + +static int sdhci_milbeaut_probe(struct platform_device *pdev) +{ + struct sdhci_host *host; + struct device *dev = &pdev->dev; + int irq, ret = 0; + struct f_sdhost_priv *priv; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + host = sdhci_alloc_host(dev, sizeof(struct f_sdhost_priv)); + if (IS_ERR(host)) + return PTR_ERR(host); + + priv = sdhci_priv(host); + priv->dev = dev; + + host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC | + SDHCI_QUIRK_INVERTED_WRITE_PROTECT | + SDHCI_QUIRK_CLOCK_BEFORE_RESET | + SDHCI_QUIRK_DELAY_AFTER_POWER; + host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE | + SDHCI_QUIRK2_TUNING_WORK_AROUND | + SDHCI_QUIRK2_PRESET_VALUE_BROKEN; + + priv->enable_cmd_dat_delay = device_property_read_bool(dev, + "fujitsu,cmd-dat-delay-select"); + + ret = mmc_of_parse(host->mmc); + if (ret) + goto err; + + platform_set_drvdata(pdev, host); + + host->hw_name = "f_sdh30"; + host->ops = &sdhci_milbeaut_ops; + host->irq = irq; + + host->ioaddr = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(host->ioaddr)) { + ret = PTR_ERR(host->ioaddr); + goto err; + } + + if (dev_of_node(dev)) { + sdhci_get_of_property(pdev); + + priv->clk_iface = devm_clk_get(&pdev->dev, "iface"); + if (IS_ERR(priv->clk_iface)) { + ret = PTR_ERR(priv->clk_iface); + goto err; + } + + ret = clk_prepare_enable(priv->clk_iface); + if (ret) + goto err; + + priv->clk = devm_clk_get(&pdev->dev, "core"); + if (IS_ERR(priv->clk)) { + ret = PTR_ERR(priv->clk); + goto err_clk; + } + + ret = clk_prepare_enable(priv->clk); + if (ret) + goto err_clk; + } + + sdhci_milbeaut_init(host); + + ret = sdhci_add_host(host); + if (ret) + goto err_add_host; + + return 0; + +err_add_host: + clk_disable_unprepare(priv->clk); +err_clk: + clk_disable_unprepare(priv->clk_iface); +err: + sdhci_free_host(host); + return ret; +} + +static int sdhci_milbeaut_remove(struct platform_device *pdev) +{ + struct sdhci_host *host = platform_get_drvdata(pdev); + struct f_sdhost_priv *priv = sdhci_priv(host); + + sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) == + 0xffffffff); + + clk_disable_unprepare(priv->clk_iface); + clk_disable_unprepare(priv->clk); + + sdhci_free_host(host); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static struct platform_driver sdhci_milbeaut_driver = { + .driver = { + .name = "sdhci-milbeaut", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + .of_match_table = of_match_ptr(mlb_dt_ids), + }, + .probe = sdhci_milbeaut_probe, + .remove = sdhci_milbeaut_remove, +}; + +module_platform_driver(sdhci_milbeaut_driver); + +MODULE_DESCRIPTION("MILBEAUT SD Card Controller driver"); +MODULE_AUTHOR("Takao Orito <orito.takao@socionext.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:sdhci-milbeaut"); |