1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/mmc/host/sdhci_f_sdh30.c 4 * 5 * Copyright (C) 2013 - 2015 Fujitsu Semiconductor, Ltd 6 * Vincent Yang <vincent.yang@tw.fujitsu.com> 7 * Copyright (C) 2015 Linaro Ltd Andy Green <andy.green@linaro.org> 8 */ 9 10 #include <linux/acpi.h> 11 #include <linux/err.h> 12 #include <linux/delay.h> 13 #include <linux/module.h> 14 #include <linux/of.h> 15 #include <linux/property.h> 16 #include <linux/clk.h> 17 18 #include "sdhci-pltfm.h" 19 #include "sdhci_f_sdh30.h" 20 21 struct f_sdhost_priv { 22 struct clk *clk_iface; 23 struct clk *clk; 24 u32 vendor_hs200; 25 struct device *dev; 26 bool enable_cmd_dat_delay; 27 }; 28 29 static void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host) 30 { 31 struct f_sdhost_priv *priv = sdhci_priv(host); 32 u32 ctrl = 0; 33 34 usleep_range(2500, 3000); 35 ctrl = sdhci_readl(host, F_SDH30_IO_CONTROL2); 36 ctrl |= F_SDH30_CRES_O_DN; 37 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 38 ctrl |= F_SDH30_MSEL_O_1_8; 39 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 40 41 ctrl &= ~F_SDH30_CRES_O_DN; 42 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 43 usleep_range(2500, 3000); 44 45 if (priv->vendor_hs200) { 46 dev_info(priv->dev, "%s: setting hs200\n", __func__); 47 ctrl = sdhci_readl(host, F_SDH30_ESD_CONTROL); 48 ctrl |= priv->vendor_hs200; 49 sdhci_writel(host, ctrl, F_SDH30_ESD_CONTROL); 50 } 51 52 ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING); 53 ctrl |= F_SDH30_CMD_CHK_DIS; 54 sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING); 55 } 56 57 static unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host) 58 { 59 return F_SDH30_MIN_CLOCK; 60 } 61 62 static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask) 63 { 64 struct f_sdhost_priv *priv = sdhci_priv(host); 65 u32 ctl; 66 67 if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0) 68 sdhci_writew(host, 0xBC01, SDHCI_CLOCK_CONTROL); 69 70 sdhci_reset(host, mask); 71 72 if (priv->enable_cmd_dat_delay) { 73 ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL); 74 ctl |= F_SDH30_CMD_DAT_DELAY; 75 sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL); 76 } 77 } 78 79 static const struct sdhci_ops sdhci_f_sdh30_ops = { 80 .voltage_switch = sdhci_f_sdh30_soft_voltage_switch, 81 .get_min_clock = sdhci_f_sdh30_get_min_clock, 82 .reset = sdhci_f_sdh30_reset, 83 .set_clock = sdhci_set_clock, 84 .set_bus_width = sdhci_set_bus_width, 85 .set_uhs_signaling = sdhci_set_uhs_signaling, 86 }; 87 88 static int sdhci_f_sdh30_probe(struct platform_device *pdev) 89 { 90 struct sdhci_host *host; 91 struct device *dev = &pdev->dev; 92 struct resource *res; 93 int irq, ctrl = 0, ret = 0; 94 struct f_sdhost_priv *priv; 95 u32 reg = 0; 96 97 irq = platform_get_irq(pdev, 0); 98 if (irq < 0) 99 return irq; 100 101 host = sdhci_alloc_host(dev, sizeof(struct f_sdhost_priv)); 102 if (IS_ERR(host)) 103 return PTR_ERR(host); 104 105 priv = sdhci_priv(host); 106 priv->dev = dev; 107 108 host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC | 109 SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 110 host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE | 111 SDHCI_QUIRK2_TUNING_WORK_AROUND; 112 113 priv->enable_cmd_dat_delay = device_property_read_bool(dev, 114 "fujitsu,cmd-dat-delay-select"); 115 116 ret = mmc_of_parse(host->mmc); 117 if (ret) 118 goto err; 119 120 platform_set_drvdata(pdev, host); 121 122 host->hw_name = "f_sdh30"; 123 host->ops = &sdhci_f_sdh30_ops; 124 host->irq = irq; 125 126 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 127 host->ioaddr = devm_ioremap_resource(&pdev->dev, res); 128 if (IS_ERR(host->ioaddr)) { 129 ret = PTR_ERR(host->ioaddr); 130 goto err; 131 } 132 133 if (dev_of_node(dev)) { 134 sdhci_get_of_property(pdev); 135 136 priv->clk_iface = devm_clk_get(&pdev->dev, "iface"); 137 if (IS_ERR(priv->clk_iface)) { 138 ret = PTR_ERR(priv->clk_iface); 139 goto err; 140 } 141 142 ret = clk_prepare_enable(priv->clk_iface); 143 if (ret) 144 goto err; 145 146 priv->clk = devm_clk_get(&pdev->dev, "core"); 147 if (IS_ERR(priv->clk)) { 148 ret = PTR_ERR(priv->clk); 149 goto err_clk; 150 } 151 152 ret = clk_prepare_enable(priv->clk); 153 if (ret) 154 goto err_clk; 155 } 156 157 /* init vendor specific regs */ 158 ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG); 159 ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 | 160 F_SDH30_AHB_INCR_4; 161 ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN); 162 sdhci_writew(host, ctrl, F_SDH30_AHB_CONFIG); 163 164 reg = sdhci_readl(host, F_SDH30_ESD_CONTROL); 165 sdhci_writel(host, reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); 166 msleep(20); 167 sdhci_writel(host, reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); 168 169 reg = sdhci_readl(host, SDHCI_CAPABILITIES); 170 if (reg & SDHCI_CAN_DO_8BIT) 171 priv->vendor_hs200 = F_SDH30_EMMC_HS200; 172 173 ret = sdhci_add_host(host); 174 if (ret) 175 goto err_add_host; 176 177 return 0; 178 179 err_add_host: 180 clk_disable_unprepare(priv->clk); 181 err_clk: 182 clk_disable_unprepare(priv->clk_iface); 183 err: 184 sdhci_free_host(host); 185 return ret; 186 } 187 188 static int sdhci_f_sdh30_remove(struct platform_device *pdev) 189 { 190 struct sdhci_host *host = platform_get_drvdata(pdev); 191 struct f_sdhost_priv *priv = sdhci_priv(host); 192 193 sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) == 194 0xffffffff); 195 196 clk_disable_unprepare(priv->clk_iface); 197 clk_disable_unprepare(priv->clk); 198 199 sdhci_free_host(host); 200 platform_set_drvdata(pdev, NULL); 201 202 return 0; 203 } 204 205 #ifdef CONFIG_OF 206 static const struct of_device_id f_sdh30_dt_ids[] = { 207 { .compatible = "fujitsu,mb86s70-sdhci-3.0" }, 208 { /* sentinel */ } 209 }; 210 MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids); 211 #endif 212 213 #ifdef CONFIG_ACPI 214 static const struct acpi_device_id f_sdh30_acpi_ids[] = { 215 { "SCX0002" }, 216 { /* sentinel */ } 217 }; 218 MODULE_DEVICE_TABLE(acpi, f_sdh30_acpi_ids); 219 #endif 220 221 static struct platform_driver sdhci_f_sdh30_driver = { 222 .driver = { 223 .name = "f_sdh30", 224 .of_match_table = of_match_ptr(f_sdh30_dt_ids), 225 .acpi_match_table = ACPI_PTR(f_sdh30_acpi_ids), 226 .pm = &sdhci_pltfm_pmops, 227 }, 228 .probe = sdhci_f_sdh30_probe, 229 .remove = sdhci_f_sdh30_remove, 230 }; 231 232 module_platform_driver(sdhci_f_sdh30_driver); 233 234 MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver"); 235 MODULE_LICENSE("GPL v2"); 236 MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD."); 237 MODULE_ALIAS("platform:f_sdh30"); 238