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 * Copyright (C) 2019 Socionext Inc. 9 */ 10 11 #include <linux/acpi.h> 12 #include <linux/err.h> 13 #include <linux/delay.h> 14 #include <linux/module.h> 15 #include <linux/of.h> 16 #include <linux/property.h> 17 #include <linux/clk.h> 18 #include <linux/reset.h> 19 20 #include "sdhci-pltfm.h" 21 #include "sdhci_f_sdh30.h" 22 23 struct f_sdhost_priv { 24 struct clk *clk_iface; 25 struct clk *clk; 26 struct reset_control *rst; 27 u32 vendor_hs200; 28 struct device *dev; 29 bool enable_cmd_dat_delay; 30 }; 31 32 static void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host) 33 { 34 struct f_sdhost_priv *priv = sdhci_priv(host); 35 u32 ctrl = 0; 36 37 usleep_range(2500, 3000); 38 ctrl = sdhci_readl(host, F_SDH30_IO_CONTROL2); 39 ctrl |= F_SDH30_CRES_O_DN; 40 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 41 ctrl |= F_SDH30_MSEL_O_1_8; 42 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 43 44 ctrl &= ~F_SDH30_CRES_O_DN; 45 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 46 usleep_range(2500, 3000); 47 48 if (priv->vendor_hs200) { 49 dev_info(priv->dev, "%s: setting hs200\n", __func__); 50 ctrl = sdhci_readl(host, F_SDH30_ESD_CONTROL); 51 ctrl |= priv->vendor_hs200; 52 sdhci_writel(host, ctrl, F_SDH30_ESD_CONTROL); 53 } 54 55 ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING); 56 ctrl |= F_SDH30_CMD_CHK_DIS; 57 sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING); 58 } 59 60 static unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host) 61 { 62 return F_SDH30_MIN_CLOCK; 63 } 64 65 static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask) 66 { 67 struct f_sdhost_priv *priv = sdhci_priv(host); 68 u32 ctl; 69 70 if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0) 71 sdhci_writew(host, 0xBC01, SDHCI_CLOCK_CONTROL); 72 73 sdhci_reset(host, mask); 74 75 if (priv->enable_cmd_dat_delay) { 76 ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL); 77 ctl |= F_SDH30_CMD_DAT_DELAY; 78 sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL); 79 } 80 } 81 82 static const struct sdhci_ops sdhci_f_sdh30_ops = { 83 .voltage_switch = sdhci_f_sdh30_soft_voltage_switch, 84 .get_min_clock = sdhci_f_sdh30_get_min_clock, 85 .reset = sdhci_f_sdh30_reset, 86 .set_clock = sdhci_set_clock, 87 .set_bus_width = sdhci_set_bus_width, 88 .set_uhs_signaling = sdhci_set_uhs_signaling, 89 }; 90 91 static int sdhci_f_sdh30_probe(struct platform_device *pdev) 92 { 93 struct sdhci_host *host; 94 struct device *dev = &pdev->dev; 95 int irq, ctrl = 0, ret = 0; 96 struct f_sdhost_priv *priv; 97 u32 reg = 0; 98 99 irq = platform_get_irq(pdev, 0); 100 if (irq < 0) 101 return irq; 102 103 host = sdhci_alloc_host(dev, sizeof(struct f_sdhost_priv)); 104 if (IS_ERR(host)) 105 return PTR_ERR(host); 106 107 priv = sdhci_priv(host); 108 priv->dev = dev; 109 110 host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC | 111 SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 112 host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE | 113 SDHCI_QUIRK2_TUNING_WORK_AROUND; 114 115 priv->enable_cmd_dat_delay = device_property_read_bool(dev, 116 "fujitsu,cmd-dat-delay-select"); 117 118 ret = mmc_of_parse(host->mmc); 119 if (ret) 120 goto err; 121 122 platform_set_drvdata(pdev, host); 123 124 host->hw_name = "f_sdh30"; 125 host->ops = &sdhci_f_sdh30_ops; 126 host->irq = irq; 127 128 host->ioaddr = devm_platform_ioremap_resource(pdev, 0); 129 if (IS_ERR(host->ioaddr)) { 130 ret = PTR_ERR(host->ioaddr); 131 goto err; 132 } 133 134 if (dev_of_node(dev)) { 135 sdhci_get_of_property(pdev); 136 137 priv->clk_iface = devm_clk_get(&pdev->dev, "iface"); 138 if (IS_ERR(priv->clk_iface)) { 139 ret = PTR_ERR(priv->clk_iface); 140 goto err; 141 } 142 143 ret = clk_prepare_enable(priv->clk_iface); 144 if (ret) 145 goto err; 146 147 priv->clk = devm_clk_get(&pdev->dev, "core"); 148 if (IS_ERR(priv->clk)) { 149 ret = PTR_ERR(priv->clk); 150 goto err_clk; 151 } 152 153 ret = clk_prepare_enable(priv->clk); 154 if (ret) 155 goto err_clk; 156 157 priv->rst = devm_reset_control_get_optional_shared(dev, NULL); 158 if (IS_ERR(priv->rst)) { 159 ret = PTR_ERR(priv->rst); 160 goto err_rst; 161 } 162 163 ret = reset_control_deassert(priv->rst); 164 if (ret) 165 goto err_rst; 166 } 167 168 /* init vendor specific regs */ 169 ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG); 170 ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 | 171 F_SDH30_AHB_INCR_4; 172 ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN); 173 sdhci_writew(host, ctrl, F_SDH30_AHB_CONFIG); 174 175 reg = sdhci_readl(host, F_SDH30_ESD_CONTROL); 176 sdhci_writel(host, reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); 177 msleep(20); 178 sdhci_writel(host, reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); 179 180 reg = sdhci_readl(host, SDHCI_CAPABILITIES); 181 if (reg & SDHCI_CAN_DO_8BIT) 182 priv->vendor_hs200 = F_SDH30_EMMC_HS200; 183 184 ret = sdhci_add_host(host); 185 if (ret) 186 goto err_add_host; 187 188 return 0; 189 190 err_add_host: 191 reset_control_assert(priv->rst); 192 err_rst: 193 clk_disable_unprepare(priv->clk); 194 err_clk: 195 clk_disable_unprepare(priv->clk_iface); 196 err: 197 sdhci_free_host(host); 198 return ret; 199 } 200 201 static int sdhci_f_sdh30_remove(struct platform_device *pdev) 202 { 203 struct sdhci_host *host = platform_get_drvdata(pdev); 204 struct f_sdhost_priv *priv = sdhci_priv(host); 205 206 sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) == 207 0xffffffff); 208 209 reset_control_assert(priv->rst); 210 clk_disable_unprepare(priv->clk); 211 clk_disable_unprepare(priv->clk_iface); 212 213 sdhci_free_host(host); 214 platform_set_drvdata(pdev, NULL); 215 216 return 0; 217 } 218 219 #ifdef CONFIG_OF 220 static const struct of_device_id f_sdh30_dt_ids[] = { 221 { .compatible = "fujitsu,mb86s70-sdhci-3.0" }, 222 { .compatible = "socionext,f-sdh30-e51-mmc" }, 223 { /* sentinel */ } 224 }; 225 MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids); 226 #endif 227 228 #ifdef CONFIG_ACPI 229 static const struct acpi_device_id f_sdh30_acpi_ids[] = { 230 { "SCX0002" }, 231 { /* sentinel */ } 232 }; 233 MODULE_DEVICE_TABLE(acpi, f_sdh30_acpi_ids); 234 #endif 235 236 static struct platform_driver sdhci_f_sdh30_driver = { 237 .driver = { 238 .name = "f_sdh30", 239 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 240 .of_match_table = of_match_ptr(f_sdh30_dt_ids), 241 .acpi_match_table = ACPI_PTR(f_sdh30_acpi_ids), 242 .pm = &sdhci_pltfm_pmops, 243 }, 244 .probe = sdhci_f_sdh30_probe, 245 .remove = sdhci_f_sdh30_remove, 246 }; 247 248 module_platform_driver(sdhci_f_sdh30_driver); 249 250 MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver"); 251 MODULE_LICENSE("GPL v2"); 252 MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD., Socionext Inc."); 253 MODULE_ALIAS("platform:f_sdh30"); 254