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 #include <linux/reset.h> 18 19 #include "sdhci-pltfm.h" 20 #include "sdhci_f_sdh30.h" 21 22 struct f_sdhost_priv { 23 struct clk *clk_iface; 24 struct clk *clk; 25 struct reset_control *rst; 26 u32 vendor_hs200; 27 struct device *dev; 28 bool enable_cmd_dat_delay; 29 }; 30 31 static void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host) 32 { 33 struct f_sdhost_priv *priv = sdhci_priv(host); 34 u32 ctrl = 0; 35 36 usleep_range(2500, 3000); 37 ctrl = sdhci_readl(host, F_SDH30_IO_CONTROL2); 38 ctrl |= F_SDH30_CRES_O_DN; 39 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 40 ctrl |= F_SDH30_MSEL_O_1_8; 41 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 42 43 ctrl &= ~F_SDH30_CRES_O_DN; 44 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 45 usleep_range(2500, 3000); 46 47 if (priv->vendor_hs200) { 48 dev_info(priv->dev, "%s: setting hs200\n", __func__); 49 ctrl = sdhci_readl(host, F_SDH30_ESD_CONTROL); 50 ctrl |= priv->vendor_hs200; 51 sdhci_writel(host, ctrl, F_SDH30_ESD_CONTROL); 52 } 53 54 ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING); 55 ctrl |= F_SDH30_CMD_CHK_DIS; 56 sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING); 57 } 58 59 static unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host) 60 { 61 return F_SDH30_MIN_CLOCK; 62 } 63 64 static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask) 65 { 66 struct f_sdhost_priv *priv = sdhci_priv(host); 67 u32 ctl; 68 69 if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0) 70 sdhci_writew(host, 0xBC01, SDHCI_CLOCK_CONTROL); 71 72 sdhci_reset(host, mask); 73 74 if (priv->enable_cmd_dat_delay) { 75 ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL); 76 ctl |= F_SDH30_CMD_DAT_DELAY; 77 sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL); 78 } 79 } 80 81 static const struct sdhci_ops sdhci_f_sdh30_ops = { 82 .voltage_switch = sdhci_f_sdh30_soft_voltage_switch, 83 .get_min_clock = sdhci_f_sdh30_get_min_clock, 84 .reset = sdhci_f_sdh30_reset, 85 .set_clock = sdhci_set_clock, 86 .set_bus_width = sdhci_set_bus_width, 87 .set_uhs_signaling = sdhci_set_uhs_signaling, 88 }; 89 90 static int sdhci_f_sdh30_probe(struct platform_device *pdev) 91 { 92 struct sdhci_host *host; 93 struct device *dev = &pdev->dev; 94 int irq, ctrl = 0, ret = 0; 95 struct f_sdhost_priv *priv; 96 u32 reg = 0; 97 98 irq = platform_get_irq(pdev, 0); 99 if (irq < 0) 100 return irq; 101 102 host = sdhci_alloc_host(dev, sizeof(struct f_sdhost_priv)); 103 if (IS_ERR(host)) 104 return PTR_ERR(host); 105 106 priv = sdhci_priv(host); 107 priv->dev = dev; 108 109 host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC | 110 SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 111 host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE | 112 SDHCI_QUIRK2_TUNING_WORK_AROUND; 113 114 priv->enable_cmd_dat_delay = device_property_read_bool(dev, 115 "fujitsu,cmd-dat-delay-select"); 116 117 ret = mmc_of_parse(host->mmc); 118 if (ret) 119 goto err; 120 121 platform_set_drvdata(pdev, host); 122 123 host->hw_name = "f_sdh30"; 124 host->ops = &sdhci_f_sdh30_ops; 125 host->irq = irq; 126 127 host->ioaddr = devm_platform_ioremap_resource(pdev, 0); 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 priv->rst = devm_reset_control_get_optional_shared(dev, NULL); 157 if (IS_ERR(priv->rst)) { 158 ret = PTR_ERR(priv->rst); 159 goto err_rst; 160 } 161 162 ret = reset_control_deassert(priv->rst); 163 if (ret) 164 goto err_rst; 165 } 166 167 /* init vendor specific regs */ 168 ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG); 169 ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 | 170 F_SDH30_AHB_INCR_4; 171 ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN); 172 sdhci_writew(host, ctrl, F_SDH30_AHB_CONFIG); 173 174 reg = sdhci_readl(host, F_SDH30_ESD_CONTROL); 175 sdhci_writel(host, reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); 176 msleep(20); 177 sdhci_writel(host, reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); 178 179 reg = sdhci_readl(host, SDHCI_CAPABILITIES); 180 if (reg & SDHCI_CAN_DO_8BIT) 181 priv->vendor_hs200 = F_SDH30_EMMC_HS200; 182 183 ret = sdhci_add_host(host); 184 if (ret) 185 goto err_add_host; 186 187 return 0; 188 189 err_add_host: 190 reset_control_assert(priv->rst); 191 err_rst: 192 clk_disable_unprepare(priv->clk); 193 err_clk: 194 clk_disable_unprepare(priv->clk_iface); 195 err: 196 sdhci_free_host(host); 197 return ret; 198 } 199 200 static int sdhci_f_sdh30_remove(struct platform_device *pdev) 201 { 202 struct sdhci_host *host = platform_get_drvdata(pdev); 203 struct f_sdhost_priv *priv = sdhci_priv(host); 204 205 sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) == 206 0xffffffff); 207 208 reset_control_assert(priv->rst); 209 clk_disable_unprepare(priv->clk); 210 clk_disable_unprepare(priv->clk_iface); 211 212 sdhci_free_host(host); 213 platform_set_drvdata(pdev, NULL); 214 215 return 0; 216 } 217 218 #ifdef CONFIG_OF 219 static const struct of_device_id f_sdh30_dt_ids[] = { 220 { .compatible = "fujitsu,mb86s70-sdhci-3.0" }, 221 { /* sentinel */ } 222 }; 223 MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids); 224 #endif 225 226 #ifdef CONFIG_ACPI 227 static const struct acpi_device_id f_sdh30_acpi_ids[] = { 228 { "SCX0002" }, 229 { /* sentinel */ } 230 }; 231 MODULE_DEVICE_TABLE(acpi, f_sdh30_acpi_ids); 232 #endif 233 234 static struct platform_driver sdhci_f_sdh30_driver = { 235 .driver = { 236 .name = "f_sdh30", 237 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 238 .of_match_table = of_match_ptr(f_sdh30_dt_ids), 239 .acpi_match_table = ACPI_PTR(f_sdh30_acpi_ids), 240 .pm = &sdhci_pltfm_pmops, 241 }, 242 .probe = sdhci_f_sdh30_probe, 243 .remove = sdhci_f_sdh30_remove, 244 }; 245 246 module_platform_driver(sdhci_f_sdh30_driver); 247 248 MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver"); 249 MODULE_LICENSE("GPL v2"); 250 MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD."); 251 MODULE_ALIAS("platform:f_sdh30"); 252