/* * Copyright (C) 2010 Google, Inc. * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * 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. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "sdhci-pltfm.h" /* Tegra SDHOST controller vendor register definitions */ #define SDHCI_TEGRA_VENDOR_CLOCK_CTRL 0x100 #define SDHCI_CLOCK_CTRL_TAP_MASK 0x00ff0000 #define SDHCI_CLOCK_CTRL_TAP_SHIFT 16 #define SDHCI_CLOCK_CTRL_SDR50_TUNING_OVERRIDE BIT(5) #define SDHCI_CLOCK_CTRL_PADPIPE_CLKEN_OVERRIDE BIT(3) #define SDHCI_CLOCK_CTRL_SPI_MODE_CLKEN_OVERRIDE BIT(2) #define SDHCI_TEGRA_VENDOR_MISC_CTRL 0x120 #define SDHCI_MISC_CTRL_ENABLE_SDR104 0x8 #define SDHCI_MISC_CTRL_ENABLE_SDR50 0x10 #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300 0x20 #define SDHCI_MISC_CTRL_ENABLE_DDR50 0x200 #define SDHCI_TEGRA_AUTO_CAL_CONFIG 0x1e4 #define SDHCI_AUTO_CAL_START BIT(31) #define SDHCI_AUTO_CAL_ENABLE BIT(29) #define NVQUIRK_FORCE_SDHCI_SPEC_200 BIT(0) #define NVQUIRK_ENABLE_BLOCK_GAP_DET BIT(1) #define NVQUIRK_ENABLE_SDHCI_SPEC_300 BIT(2) #define NVQUIRK_ENABLE_SDR50 BIT(3) #define NVQUIRK_ENABLE_SDR104 BIT(4) #define NVQUIRK_ENABLE_DDR50 BIT(5) #define NVQUIRK_HAS_PADCALIB BIT(6) struct sdhci_tegra_soc_data { const struct sdhci_pltfm_data *pdata; u32 nvquirks; }; struct sdhci_tegra { const struct sdhci_tegra_soc_data *soc_data; struct gpio_desc *power_gpio; bool ddr_signaling; bool pad_calib_required; struct reset_control *rst; }; static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; if (unlikely((soc_data->nvquirks & NVQUIRK_FORCE_SDHCI_SPEC_200) && (reg == SDHCI_HOST_VERSION))) { /* Erratum: Version register is invalid in HW. */ return SDHCI_SPEC_200; } return readw(host->ioaddr + reg); } static void tegra_sdhci_writew(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->xfer_mode_shadow = val; return; case SDHCI_COMMAND: writel((val << 16) | pltfm_host->xfer_mode_shadow, host->ioaddr + SDHCI_TRANSFER_MODE); return; } writew(val, host->ioaddr + reg); } static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; /* Seems like we're getting spurious timeout and crc errors, so * disable signalling of them. In case of real errors software * timers should take care of eventually detecting them. */ if (unlikely(reg == SDHCI_SIGNAL_ENABLE)) val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC); writel(val, host->ioaddr + reg); if (unlikely((soc_data->nvquirks & NVQUIRK_ENABLE_BLOCK_GAP_DET) && (reg == SDHCI_INT_ENABLE))) { /* Erratum: Must enable block gap interrupt detection */ u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL); if (val & SDHCI_INT_CARD_INT) gap_ctrl |= 0x8; else gap_ctrl &= ~0x8; writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL); } } static unsigned int tegra_sdhci_get_ro(struct sdhci_host *host) { return mmc_gpio_get_ro(host->mmc); } static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; u32 misc_ctrl, clk_ctrl; sdhci_reset(host, mask); if (!(mask & SDHCI_RESET_ALL)) return; misc_ctrl = sdhci_readl(host, SDHCI_TEGRA_VENDOR_MISC_CTRL); clk_ctrl = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); misc_ctrl &= ~(SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300 | SDHCI_MISC_CTRL_ENABLE_SDR50 | SDHCI_MISC_CTRL_ENABLE_DDR50 | SDHCI_MISC_CTRL_ENABLE_SDR104); clk_ctrl &= ~SDHCI_CLOCK_CTRL_SPI_MODE_CLKEN_OVERRIDE; /* * If the board does not define a regulator for the SDHCI * IO voltage, then don't advertise support for UHS modes * even if the device supports it because the IO voltage * cannot be configured. */ if (!IS_ERR(host->mmc->supply.vqmmc)) { /* Erratum: Enable SDHCI spec v3.00 support */ if (soc_data->nvquirks & NVQUIRK_ENABLE_SDHCI_SPEC_300) misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300; /* Advertise UHS modes as supported by host */ if (soc_data->nvquirks & NVQUIRK_ENABLE_SDR50) misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDR50; if (soc_data->nvquirks & NVQUIRK_ENABLE_DDR50) misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_DDR50; if (soc_data->nvquirks & NVQUIRK_ENABLE_SDR104) misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDR104; if (soc_data->nvquirks & SDHCI_MISC_CTRL_ENABLE_SDR50) clk_ctrl |= SDHCI_CLOCK_CTRL_SDR50_TUNING_OVERRIDE; } sdhci_writel(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL); sdhci_writel(host, clk_ctrl, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); if (soc_data->nvquirks & NVQUIRK_HAS_PADCALIB) tegra_host->pad_calib_required = true; tegra_host->ddr_signaling = false; } static void tegra_sdhci_pad_autocalib(struct sdhci_host *host) { u32 val; mdelay(1); val = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG); val |= SDHCI_AUTO_CAL_ENABLE | SDHCI_AUTO_CAL_START; sdhci_writel(host,val, SDHCI_TEGRA_AUTO_CAL_CONFIG); } static void tegra_sdhci_set_clock(struct sdhci_host *host, unsigned int clock) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); unsigned long host_clk; if (!clock) return sdhci_set_clock(host, clock); /* * In DDR50/52 modes the Tegra SDHCI controllers require the SDHCI * divider to be configured to divided the host clock by two. The SDHCI * clock divider is calculated as part of sdhci_set_clock() by * sdhci_calc_clk(). The divider is calculated from host->max_clk and * the requested clock rate. * * By setting the host->max_clk to clock * 2 the divider calculation * will always result in the correct value for DDR50/52 modes, * regardless of clock rate rounding, which may happen if the value * from clk_get_rate() is used. */ host_clk = tegra_host->ddr_signaling ? clock * 2 : clock; clk_set_rate(pltfm_host->clk, host_clk); if (tegra_host->ddr_signaling) host->max_clk = host_clk; else host->max_clk = clk_get_rate(pltfm_host->clk); sdhci_set_clock(host, clock); if (tegra_host->pad_calib_required) { tegra_sdhci_pad_autocalib(host); tegra_host->pad_calib_required = false; } } static void tegra_sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); if (timing == MMC_TIMING_UHS_DDR50 || timing == MMC_TIMING_MMC_DDR52) tegra_host->ddr_signaling = true; sdhci_set_uhs_signaling(host, timing); } static unsigned int tegra_sdhci_get_max_clock(struct sdhci_host *host) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); return clk_round_rate(pltfm_host->clk, UINT_MAX); } static void tegra_sdhci_set_tap(struct sdhci_host *host, unsigned int tap) { u32 reg; reg = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); reg &= ~SDHCI_CLOCK_CTRL_TAP_MASK; reg |= tap << SDHCI_CLOCK_CTRL_TAP_SHIFT; sdhci_writel(host, reg, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); } static int tegra_sdhci_execute_tuning(struct sdhci_host *host, u32 opcode) { unsigned int min, max; /* * Start search for minimum tap value at 10, as smaller values are * may wrongly be reported as working but fail at higher speeds, * according to the TRM. */ min = 10; while (min < 255) { tegra_sdhci_set_tap(host, min); if (!mmc_send_tuning(host->mmc, opcode, NULL)) break; min++; } /* Find the maximum tap value that still passes. */ max = min + 1; while (max < 255) { tegra_sdhci_set_tap(host, max); if (mmc_send_tuning(host->mmc, opcode, NULL)) { max--; break; } max++; } /* The TRM states the ideal tap value is at 75% in the passing range. */ tegra_sdhci_set_tap(host, min + ((max - min) * 3 / 4)); return mmc_send_tuning(host->mmc, opcode, NULL); } static void tegra_sdhci_voltage_switch(struct sdhci_host *host) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; if (soc_data->nvquirks & NVQUIRK_HAS_PADCALIB) tegra_host->pad_calib_required = true; } static const struct sdhci_ops tegra_sdhci_ops = { .get_ro = tegra_sdhci_get_ro, .read_w = tegra_sdhci_readw, .write_l = tegra_sdhci_writel, .set_clock = tegra_sdhci_set_clock, .set_bus_width = sdhci_set_bus_width, .reset = tegra_sdhci_reset, .platform_execute_tuning = tegra_sdhci_execute_tuning, .set_uhs_signaling = tegra_sdhci_set_uhs_signaling, .voltage_switch = tegra_sdhci_voltage_switch, .get_max_clock = tegra_sdhci_get_max_clock, }; static const struct sdhci_pltfm_data sdhci_tegra20_pdata = { .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | SDHCI_QUIRK_SINGLE_POWER_WRITE | SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, .ops = &tegra_sdhci_ops, }; static const struct sdhci_tegra_soc_data soc_data_tegra20 = { .pdata = &sdhci_tegra20_pdata, .nvquirks = NVQUIRK_FORCE_SDHCI_SPEC_200 | NVQUIRK_ENABLE_BLOCK_GAP_DET, }; static const struct sdhci_pltfm_data sdhci_tegra30_pdata = { .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | SDHCI_QUIRK_SINGLE_POWER_WRITE | SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | SDHCI_QUIRK2_BROKEN_HS200 | /* * Auto-CMD23 leads to "Got command interrupt 0x00010000 even * though no command operation was in progress." * * The exact reason is unknown, as the same hardware seems * to support Auto CMD23 on a downstream 3.1 kernel. */ SDHCI_QUIRK2_ACMD23_BROKEN, .ops = &tegra_sdhci_ops, }; static const struct sdhci_tegra_soc_data soc_data_tegra30 = { .pdata = &sdhci_tegra30_pdata, .nvquirks = NVQUIRK_ENABLE_SDHCI_SPEC_300 | NVQUIRK_ENABLE_SDR50 | NVQUIRK_ENABLE_SDR104 | NVQUIRK_HAS_PADCALIB, }; static const struct sdhci_ops tegra114_sdhci_ops = { .get_ro = tegra_sdhci_get_ro, .read_w = tegra_sdhci_readw, .write_w = tegra_sdhci_writew, .write_l = tegra_sdhci_writel, .set_clock = tegra_sdhci_set_clock, .set_bus_width = sdhci_set_bus_width, .reset = tegra_sdhci_reset, .platform_execute_tuning = tegra_sdhci_execute_tuning, .set_uhs_signaling = tegra_sdhci_set_uhs_signaling, .voltage_switch = tegra_sdhci_voltage_switch, .get_max_clock = tegra_sdhci_get_max_clock, }; static const struct sdhci_pltfm_data sdhci_tegra114_pdata = { .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | SDHCI_QUIRK_SINGLE_POWER_WRITE | SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN, .ops = &tegra114_sdhci_ops, }; static const struct sdhci_tegra_soc_data soc_data_tegra114 = { .pdata = &sdhci_tegra114_pdata, }; static const struct sdhci_pltfm_data sdhci_tegra124_pdata = { .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | SDHCI_QUIRK_SINGLE_POWER_WRITE | SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | /* * The TRM states that the SD/MMC controller found on * Tegra124 can address 34 bits (the maximum supported by * the Tegra memory controller), but tests show that DMA * to or from above 4 GiB doesn't work. This is possibly * caused by missing programming, though it's not obvious * what sequence is required. Mark 64-bit DMA broken for * now to fix this for existing users (e.g. Nyan boards). */ SDHCI_QUIRK2_BROKEN_64_BIT_DMA, .ops = &tegra114_sdhci_ops, }; static const struct sdhci_tegra_soc_data soc_data_tegra124 = { .pdata = &sdhci_tegra124_pdata, }; static const struct sdhci_pltfm_data sdhci_tegra210_pdata = { .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | SDHCI_QUIRK_SINGLE_POWER_WRITE | SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN, .ops = &tegra114_sdhci_ops, }; static const struct sdhci_tegra_soc_data soc_data_tegra210 = { .pdata = &sdhci_tegra210_pdata, }; static const struct sdhci_pltfm_data sdhci_tegra186_pdata = { .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | SDHCI_QUIRK_SINGLE_POWER_WRITE | SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | /* SDHCI controllers on Tegra186 support 40-bit addressing. * IOVA addresses are 48-bit wide on Tegra186. * With 64-bit dma mask used for SDHCI, accesses can * be broken. Disable 64-bit dma, which would fall back * to 32-bit dma mask. Ideally 40-bit dma mask would work, * But it is not supported as of now. */ SDHCI_QUIRK2_BROKEN_64_BIT_DMA, .ops = &tegra114_sdhci_ops, }; static const struct sdhci_tegra_soc_data soc_data_tegra186 = { .pdata = &sdhci_tegra186_pdata, }; static const struct of_device_id sdhci_tegra_dt_match[] = { { .compatible = "nvidia,tegra186-sdhci", .data = &soc_data_tegra186 }, { .compatible = "nvidia,tegra210-sdhci", .data = &soc_data_tegra210 }, { .compatible = "nvidia,tegra124-sdhci", .data = &soc_data_tegra124 }, { .compatible = "nvidia,tegra114-sdhci", .data = &soc_data_tegra114 }, { .compatible = "nvidia,tegra30-sdhci", .data = &soc_data_tegra30 }, { .compatible = "nvidia,tegra20-sdhci", .data = &soc_data_tegra20 }, {} }; MODULE_DEVICE_TABLE(of, sdhci_tegra_dt_match); static int sdhci_tegra_probe(struct platform_device *pdev) { const struct of_device_id *match; const struct sdhci_tegra_soc_data *soc_data; struct sdhci_host *host; struct sdhci_pltfm_host *pltfm_host; struct sdhci_tegra *tegra_host; struct clk *clk; int rc; match = of_match_device(sdhci_tegra_dt_match, &pdev->dev); if (!match) return -EINVAL; soc_data = match->data; host = sdhci_pltfm_init(pdev, soc_data->pdata, sizeof(*tegra_host)); if (IS_ERR(host)) return PTR_ERR(host); pltfm_host = sdhci_priv(host); tegra_host = sdhci_pltfm_priv(pltfm_host); tegra_host->ddr_signaling = false; tegra_host->pad_calib_required = false; tegra_host->soc_data = soc_data; rc = mmc_of_parse(host->mmc); if (rc) goto err_parse_dt; if (tegra_host->soc_data->nvquirks & NVQUIRK_ENABLE_DDR50) host->mmc->caps |= MMC_CAP_1_8V_DDR; tegra_host->power_gpio = devm_gpiod_get_optional(&pdev->dev, "power", GPIOD_OUT_HIGH); if (IS_ERR(tegra_host->power_gpio)) { rc = PTR_ERR(tegra_host->power_gpio); goto err_power_req; } clk = devm_clk_get(mmc_dev(host->mmc), NULL); if (IS_ERR(clk)) { dev_err(mmc_dev(host->mmc), "clk err\n"); rc = PTR_ERR(clk); goto err_clk_get; } clk_prepare_enable(clk); pltfm_host->clk = clk; tegra_host->rst = devm_reset_control_get_exclusive(&pdev->dev, "sdhci"); if (IS_ERR(tegra_host->rst)) { rc = PTR_ERR(tegra_host->rst); dev_err(&pdev->dev, "failed to get reset control: %d\n", rc); goto err_rst_get; } rc = reset_control_assert(tegra_host->rst); if (rc) goto err_rst_get; usleep_range(2000, 4000); rc = reset_control_deassert(tegra_host->rst); if (rc) goto err_rst_get; usleep_range(2000, 4000); rc = sdhci_add_host(host); if (rc) goto err_add_host; return 0; err_add_host: reset_control_assert(tegra_host->rst); err_rst_get: clk_disable_unprepare(pltfm_host->clk); err_clk_get: err_power_req: err_parse_dt: sdhci_pltfm_free(pdev); return rc; } static int sdhci_tegra_remove(struct platform_device *pdev) { struct sdhci_host *host = platform_get_drvdata(pdev); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); sdhci_remove_host(host, 0); reset_control_assert(tegra_host->rst); usleep_range(2000, 4000); clk_disable_unprepare(pltfm_host->clk); sdhci_pltfm_free(pdev); return 0; } static struct platform_driver sdhci_tegra_driver = { .driver = { .name = "sdhci-tegra", .of_match_table = sdhci_tegra_dt_match, .pm = &sdhci_pltfm_pmops, }, .probe = sdhci_tegra_probe, .remove = sdhci_tegra_remove, }; module_platform_driver(sdhci_tegra_driver); MODULE_DESCRIPTION("SDHCI driver for Tegra"); MODULE_AUTHOR("Google, Inc."); MODULE_LICENSE("GPL v2");