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 int irq, ctrl = 0, ret = 0; 93 struct f_sdhost_priv *priv; 94 u32 reg = 0; 95 96 irq = platform_get_irq(pdev, 0); 97 if (irq < 0) 98 return irq; 99 100 host = sdhci_alloc_host(dev, sizeof(struct f_sdhost_priv)); 101 if (IS_ERR(host)) 102 return PTR_ERR(host); 103 104 priv = sdhci_priv(host); 105 priv->dev = dev; 106 107 host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC | 108 SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 109 host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE | 110 SDHCI_QUIRK2_TUNING_WORK_AROUND; 111 112 priv->enable_cmd_dat_delay = device_property_read_bool(dev, 113 "fujitsu,cmd-dat-delay-select"); 114 115 ret = mmc_of_parse(host->mmc); 116 if (ret) 117 goto err; 118 119 platform_set_drvdata(pdev, host); 120 121 host->hw_name = "f_sdh30"; 122 host->ops = &sdhci_f_sdh30_ops; 123 host->irq = irq; 124 125 host->ioaddr = devm_platform_ioremap_resource(pdev, 0); 126 if (IS_ERR(host->ioaddr)) { 127 ret = PTR_ERR(host->ioaddr); 128 goto err; 129 } 130 131 if (dev_of_node(dev)) { 132 sdhci_get_of_property(pdev); 133 134 priv->clk_iface = devm_clk_get(&pdev->dev, "iface"); 135 if (IS_ERR(priv->clk_iface)) { 136 ret = PTR_ERR(priv->clk_iface); 137 goto err; 138 } 139 140 ret = clk_prepare_enable(priv->clk_iface); 141 if (ret) 142 goto err; 143 144 priv->clk = devm_clk_get(&pdev->dev, "core"); 145 if (IS_ERR(priv->clk)) { 146 ret = PTR_ERR(priv->clk); 147 goto err_clk; 148 } 149 150 ret = clk_prepare_enable(priv->clk); 151 if (ret) 152 goto err_clk; 153 } 154 155 /* init vendor specific regs */ 156 ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG); 157 ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 | 158 F_SDH30_AHB_INCR_4; 159 ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN); 160 sdhci_writew(host, ctrl, F_SDH30_AHB_CONFIG); 161 162 reg = sdhci_readl(host, F_SDH30_ESD_CONTROL); 163 sdhci_writel(host, reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); 164 msleep(20); 165 sdhci_writel(host, reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); 166 167 reg = sdhci_readl(host, SDHCI_CAPABILITIES); 168 if (reg & SDHCI_CAN_DO_8BIT) 169 priv->vendor_hs200 = F_SDH30_EMMC_HS200; 170 171 ret = sdhci_add_host(host); 172 if (ret) 173 goto err_add_host; 174 175 return 0; 176 177 err_add_host: 178 clk_disable_unprepare(priv->clk); 179 err_clk: 180 clk_disable_unprepare(priv->clk_iface); 181 err: 182 sdhci_free_host(host); 183 return ret; 184 } 185 186 static int sdhci_f_sdh30_remove(struct platform_device *pdev) 187 { 188 struct sdhci_host *host = platform_get_drvdata(pdev); 189 struct f_sdhost_priv *priv = sdhci_priv(host); 190 191 sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) == 192 0xffffffff); 193 194 clk_disable_unprepare(priv->clk_iface); 195 clk_disable_unprepare(priv->clk); 196 197 sdhci_free_host(host); 198 platform_set_drvdata(pdev, NULL); 199 200 return 0; 201 } 202 203 #ifdef CONFIG_OF 204 static const struct of_device_id f_sdh30_dt_ids[] = { 205 { .compatible = "fujitsu,mb86s70-sdhci-3.0" }, 206 { /* sentinel */ } 207 }; 208 MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids); 209 #endif 210 211 #ifdef CONFIG_ACPI 212 static const struct acpi_device_id f_sdh30_acpi_ids[] = { 213 { "SCX0002" }, 214 { /* sentinel */ } 215 }; 216 MODULE_DEVICE_TABLE(acpi, f_sdh30_acpi_ids); 217 #endif 218 219 static struct platform_driver sdhci_f_sdh30_driver = { 220 .driver = { 221 .name = "f_sdh30", 222 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 223 .of_match_table = of_match_ptr(f_sdh30_dt_ids), 224 .acpi_match_table = ACPI_PTR(f_sdh30_acpi_ids), 225 .pm = &sdhci_pltfm_pmops, 226 }, 227 .probe = sdhci_f_sdh30_probe, 228 .remove = sdhci_f_sdh30_remove, 229 }; 230 231 module_platform_driver(sdhci_f_sdh30_driver); 232 233 MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver"); 234 MODULE_LICENSE("GPL v2"); 235 MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD."); 236 MODULE_ALIAS("platform:f_sdh30"); 237