| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Faiz Abbas | 1475 | 100.00% | 1 | 100.00% |
| Total | 1475 | 1 |
// SPDX-License-Identifier: GPL-2.0 /* * sdhci_am654.c - SDHCI driver for TI's AM654 SOCs * * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com * */ #include <linux/clk.h> #include <linux/module.h> #include <linux/pm_runtime.h> #include <linux/property.h> #include <linux/regmap.h> #include "sdhci-pltfm.h" /* CTL_CFG Registers */ #define CTL_CFG_2 0x14 #define SLOTTYPE_MASK GENMASK(31, 30) #define SLOTTYPE_EMBEDDED BIT(30) /* PHY Registers */ #define PHY_CTRL1 0x100 #define PHY_CTRL2 0x104 #define PHY_CTRL3 0x108 #define PHY_CTRL4 0x10C #define PHY_CTRL5 0x110 #define PHY_CTRL6 0x114 #define PHY_STAT1 0x130 #define PHY_STAT2 0x134 #define IOMUX_ENABLE_SHIFT 31 #define IOMUX_ENABLE_MASK BIT(IOMUX_ENABLE_SHIFT) #define OTAPDLYENA_SHIFT 20 #define OTAPDLYENA_MASK BIT(OTAPDLYENA_SHIFT) #define OTAPDLYSEL_SHIFT 12 #define OTAPDLYSEL_MASK GENMASK(15, 12) #define STRBSEL_SHIFT 24 #define STRBSEL_MASK GENMASK(27, 24) #define SEL50_SHIFT 8 #define SEL50_MASK BIT(SEL50_SHIFT) #define SEL100_SHIFT 9 #define SEL100_MASK BIT(SEL100_SHIFT) #define DLL_TRIM_ICP_SHIFT 4 #define DLL_TRIM_ICP_MASK GENMASK(7, 4) #define DR_TY_SHIFT 20 #define DR_TY_MASK GENMASK(22, 20) #define ENDLL_SHIFT 1 #define ENDLL_MASK BIT(ENDLL_SHIFT) #define DLLRDY_SHIFT 0 #define DLLRDY_MASK BIT(DLLRDY_SHIFT) #define PDB_SHIFT 0 #define PDB_MASK BIT(PDB_SHIFT) #define CALDONE_SHIFT 1 #define CALDONE_MASK BIT(CALDONE_SHIFT) #define RETRIM_SHIFT 17 #define RETRIM_MASK BIT(RETRIM_SHIFT) #define DRIVER_STRENGTH_50_OHM 0x0 #define DRIVER_STRENGTH_33_OHM 0x1 #define DRIVER_STRENGTH_66_OHM 0x2 #define DRIVER_STRENGTH_100_OHM 0x3 #define DRIVER_STRENGTH_40_OHM 0x4 #define CLOCK_TOO_SLOW_HZ 400000 static struct regmap_config sdhci_am654_regmap_config = { .reg_bits = 32, .val_bits = 32, .reg_stride = 4, .fast_io = true, }; struct sdhci_am654_data { struct regmap *base; int otap_del_sel; int trm_icp; int drv_strength; bool dll_on; }; static void sdhci_am654_set_clock(struct sdhci_host *host, unsigned int clock) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); int sel50, sel100; u32 mask, val; int ret; if (sdhci_am654->dll_on) { regmap_update_bits(sdhci_am654->base, PHY_CTRL1, ENDLL_MASK, 0); sdhci_am654->dll_on = false; } sdhci_set_clock(host, clock); if (clock > CLOCK_TOO_SLOW_HZ) { /* Setup DLL Output TAP delay */ mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK; val = (1 << OTAPDLYENA_SHIFT) | (sdhci_am654->otap_del_sel << OTAPDLYSEL_SHIFT); regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val); switch (clock) { case 200000000: sel50 = 0; sel100 = 0; break; case 100000000: sel50 = 0; sel100 = 1; break; default: sel50 = 1; sel100 = 0; } /* Configure PHY DLL frequency */ mask = SEL50_MASK | SEL100_MASK; val = (sel50 << SEL50_SHIFT) | (sel100 << SEL100_SHIFT); regmap_update_bits(sdhci_am654->base, PHY_CTRL5, mask, val); /* Configure DLL TRIM */ mask = DLL_TRIM_ICP_MASK; val = sdhci_am654->trm_icp << DLL_TRIM_ICP_SHIFT; /* Configure DLL driver strength */ mask |= DR_TY_MASK; val |= sdhci_am654->drv_strength << DR_TY_SHIFT; regmap_update_bits(sdhci_am654->base, PHY_CTRL1, mask, val); /* Enable DLL */ regmap_update_bits(sdhci_am654->base, PHY_CTRL1, ENDLL_MASK, 0x1 << ENDLL_SHIFT); /* * Poll for DLL ready. Use a one second timeout. * Works in all experiments done so far */ ret = regmap_read_poll_timeout(sdhci_am654->base, PHY_STAT1, val, val & DLLRDY_MASK, 1000, 1000000); sdhci_am654->dll_on = true; } } static void sdhci_am654_set_power(struct sdhci_host *host, unsigned char mode, unsigned short vdd) { if (!IS_ERR(host->mmc->supply.vmmc)) { struct mmc_host *mmc = host->mmc; mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); } sdhci_set_power_noreg(host, mode, vdd); } struct sdhci_ops sdhci_am654_ops = { .get_max_clock = sdhci_pltfm_clk_get_max_clock, .get_timeout_clock = sdhci_pltfm_clk_get_max_clock, .set_uhs_signaling = sdhci_set_uhs_signaling, .set_bus_width = sdhci_set_bus_width, .set_power = sdhci_am654_set_power, .set_clock = sdhci_am654_set_clock, .reset = sdhci_reset, }; static const struct sdhci_pltfm_data sdhci_am654_pdata = { .ops = &sdhci_am654_ops, .quirks = SDHCI_QUIRK_INVERTED_WRITE_PROTECT | SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12, .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN, }; static int sdhci_am654_init(struct sdhci_host *host) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); u32 ctl_cfg_2 = 0; u32 mask; u32 val; int ret; /* Reset OTAP to default value */ mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK; regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, 0x0); regmap_read(sdhci_am654->base, PHY_STAT1, &val); if (~val & CALDONE_MASK) { /* Calibrate IO lines */ regmap_update_bits(sdhci_am654->base, PHY_CTRL1, PDB_MASK, PDB_MASK); ret = regmap_read_poll_timeout(sdhci_am654->base, PHY_STAT1, val, val & CALDONE_MASK, 1, 20); if (ret) return ret; } /* Enable pins by setting IO mux to 0 */ regmap_update_bits(sdhci_am654->base, PHY_CTRL1, IOMUX_ENABLE_MASK, 0); /* Set slot type based on SD or eMMC */ if (host->mmc->caps & MMC_CAP_NONREMOVABLE) ctl_cfg_2 = SLOTTYPE_EMBEDDED; regmap_update_bits(sdhci_am654->base, CTL_CFG_2, ctl_cfg_2, SLOTTYPE_MASK); return sdhci_add_host(host); } static int sdhci_am654_get_of_property(struct platform_device *pdev, struct sdhci_am654_data *sdhci_am654) { struct device *dev = &pdev->dev; int drv_strength; int ret; ret = device_property_read_u32(dev, "ti,trm-icp", &sdhci_am654->trm_icp); if (ret) return ret; ret = device_property_read_u32(dev, "ti,otap-del-sel", &sdhci_am654->otap_del_sel); if (ret) return ret; ret = device_property_read_u32(dev, "ti,driver-strength-ohm", &drv_strength); if (ret) return ret; switch (drv_strength) { case 50: sdhci_am654->drv_strength = DRIVER_STRENGTH_50_OHM; break; case 33: sdhci_am654->drv_strength = DRIVER_STRENGTH_33_OHM; break; case 66: sdhci_am654->drv_strength = DRIVER_STRENGTH_66_OHM; break; case 100: sdhci_am654->drv_strength = DRIVER_STRENGTH_100_OHM; break; case 40: sdhci_am654->drv_strength = DRIVER_STRENGTH_40_OHM; break; default: dev_err(dev, "Invalid driver strength\n"); return -EINVAL; } sdhci_get_of_property(pdev); return 0; } static int sdhci_am654_probe(struct platform_device *pdev) { struct sdhci_pltfm_host *pltfm_host; struct sdhci_am654_data *sdhci_am654; struct sdhci_host *host; struct resource *res; struct clk *clk_xin; struct device *dev = &pdev->dev; void __iomem *base; int ret; host = sdhci_pltfm_init(pdev, &sdhci_am654_pdata, sizeof(*sdhci_am654)); if (IS_ERR(host)) return PTR_ERR(host); pltfm_host = sdhci_priv(host); sdhci_am654 = sdhci_pltfm_priv(pltfm_host); clk_xin = devm_clk_get(dev, "clk_xin"); if (IS_ERR(clk_xin)) { dev_err(dev, "clk_xin clock not found.\n"); ret = PTR_ERR(clk_xin); goto err_pltfm_free; } pltfm_host->clk = clk_xin; /* Clocks are enabled using pm_runtime */ pm_runtime_enable(dev); ret = pm_runtime_get_sync(dev); if (ret < 0) { pm_runtime_put_noidle(dev); goto pm_runtime_disable; } res = platform_get_resource(pdev, IORESOURCE_MEM, 1); base = devm_ioremap_resource(dev, res); if (IS_ERR(base)) { ret = PTR_ERR(base); goto pm_runtime_put; } sdhci_am654->base = devm_regmap_init_mmio(dev, base, &sdhci_am654_regmap_config); if (IS_ERR(sdhci_am654->base)) { dev_err(dev, "Failed to initialize regmap\n"); ret = PTR_ERR(sdhci_am654->base); goto pm_runtime_put; } ret = sdhci_am654_get_of_property(pdev, sdhci_am654); if (ret) goto pm_runtime_put; ret = mmc_of_parse(host->mmc); if (ret) { dev_err(dev, "parsing dt failed (%d)\n", ret); goto pm_runtime_put; } ret = sdhci_am654_init(host); if (ret) goto pm_runtime_put; return 0; pm_runtime_put: pm_runtime_put_sync(dev); pm_runtime_disable: pm_runtime_disable(dev); err_pltfm_free: sdhci_pltfm_free(pdev); return ret; } static int sdhci_am654_remove(struct platform_device *pdev) { struct sdhci_host *host = platform_get_drvdata(pdev); int ret; sdhci_remove_host(host, true); ret = pm_runtime_put_sync(&pdev->dev); if (ret < 0) return ret; pm_runtime_disable(&pdev->dev); sdhci_pltfm_free(pdev); return 0; } static const struct of_device_id sdhci_am654_of_match[] = { { .compatible = "ti,am654-sdhci-5.1" }, { /* sentinel */ } }; static struct platform_driver sdhci_am654_driver = { .driver = { .name = "sdhci-am654", .of_match_table = sdhci_am654_of_match, }, .probe = sdhci_am654_probe, .remove = sdhci_am654_remove, }; module_platform_driver(sdhci_am654_driver); MODULE_DESCRIPTION("Driver for SDHCI Controller on TI's AM654 devices"); MODULE_AUTHOR("Faiz Abbas <faiz_abbas@ti.com>"); MODULE_LICENSE("GPL");
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