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 if ((host->mmc->caps & MMC_CAP_NONREMOVABLE) && 82 !(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) { 83 ctl = sdhci_readl(host, F_SDH30_TEST); 84 ctl |= F_SDH30_FORCE_CARD_INSERT; 85 sdhci_writel(host, ctl, F_SDH30_TEST); 86 } 87 } 88 89 static const struct sdhci_ops sdhci_f_sdh30_ops = { 90 .voltage_switch = sdhci_f_sdh30_soft_voltage_switch, 91 .get_min_clock = sdhci_f_sdh30_get_min_clock, 92 .reset = sdhci_f_sdh30_reset, 93 .set_clock = sdhci_set_clock, 94 .set_bus_width = sdhci_set_bus_width, 95 .set_uhs_signaling = sdhci_set_uhs_signaling, 96 }; 97 98 static int sdhci_f_sdh30_probe(struct platform_device *pdev) 99 { 100 struct sdhci_host *host; 101 struct device *dev = &pdev->dev; 102 int irq, ctrl = 0, ret = 0; 103 struct f_sdhost_priv *priv; 104 u32 reg = 0; 105 106 irq = platform_get_irq(pdev, 0); 107 if (irq < 0) 108 return irq; 109 110 host = sdhci_alloc_host(dev, sizeof(struct f_sdhost_priv)); 111 if (IS_ERR(host)) 112 return PTR_ERR(host); 113 114 priv = sdhci_priv(host); 115 priv->dev = dev; 116 117 host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC | 118 SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 119 host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE | 120 SDHCI_QUIRK2_TUNING_WORK_AROUND; 121 122 priv->enable_cmd_dat_delay = device_property_read_bool(dev, 123 "fujitsu,cmd-dat-delay-select"); 124 125 ret = mmc_of_parse(host->mmc); 126 if (ret) 127 goto err; 128 129 platform_set_drvdata(pdev, host); 130 131 host->hw_name = "f_sdh30"; 132 host->ops = &sdhci_f_sdh30_ops; 133 host->irq = irq; 134 135 host->ioaddr = devm_platform_ioremap_resource(pdev, 0); 136 if (IS_ERR(host->ioaddr)) { 137 ret = PTR_ERR(host->ioaddr); 138 goto err; 139 } 140 141 if (dev_of_node(dev)) { 142 sdhci_get_of_property(pdev); 143 144 priv->clk_iface = devm_clk_get(&pdev->dev, "iface"); 145 if (IS_ERR(priv->clk_iface)) { 146 ret = PTR_ERR(priv->clk_iface); 147 goto err; 148 } 149 150 ret = clk_prepare_enable(priv->clk_iface); 151 if (ret) 152 goto err; 153 154 priv->clk = devm_clk_get(&pdev->dev, "core"); 155 if (IS_ERR(priv->clk)) { 156 ret = PTR_ERR(priv->clk); 157 goto err_clk; 158 } 159 160 ret = clk_prepare_enable(priv->clk); 161 if (ret) 162 goto err_clk; 163 164 priv->rst = devm_reset_control_get_optional_shared(dev, NULL); 165 if (IS_ERR(priv->rst)) { 166 ret = PTR_ERR(priv->rst); 167 goto err_rst; 168 } 169 170 ret = reset_control_deassert(priv->rst); 171 if (ret) 172 goto err_rst; 173 } 174 175 /* init vendor specific regs */ 176 ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG); 177 ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 | 178 F_SDH30_AHB_INCR_4; 179 ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN); 180 sdhci_writew(host, ctrl, F_SDH30_AHB_CONFIG); 181 182 reg = sdhci_readl(host, F_SDH30_ESD_CONTROL); 183 sdhci_writel(host, reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); 184 msleep(20); 185 sdhci_writel(host, reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); 186 187 reg = sdhci_readl(host, SDHCI_CAPABILITIES); 188 if (reg & SDHCI_CAN_DO_8BIT) 189 priv->vendor_hs200 = F_SDH30_EMMC_HS200; 190 191 ret = sdhci_add_host(host); 192 if (ret) 193 goto err_add_host; 194 195 return 0; 196 197 err_add_host: 198 reset_control_assert(priv->rst); 199 err_rst: 200 clk_disable_unprepare(priv->clk); 201 err_clk: 202 clk_disable_unprepare(priv->clk_iface); 203 err: 204 sdhci_free_host(host); 205 return ret; 206 } 207 208 static int sdhci_f_sdh30_remove(struct platform_device *pdev) 209 { 210 struct sdhci_host *host = platform_get_drvdata(pdev); 211 struct f_sdhost_priv *priv = sdhci_priv(host); 212 213 sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) == 214 0xffffffff); 215 216 reset_control_assert(priv->rst); 217 clk_disable_unprepare(priv->clk); 218 clk_disable_unprepare(priv->clk_iface); 219 220 sdhci_free_host(host); 221 platform_set_drvdata(pdev, NULL); 222 223 return 0; 224 } 225 226 #ifdef CONFIG_OF 227 static const struct of_device_id f_sdh30_dt_ids[] = { 228 { .compatible = "fujitsu,mb86s70-sdhci-3.0" }, 229 { .compatible = "socionext,f-sdh30-e51-mmc" }, 230 { /* sentinel */ } 231 }; 232 MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids); 233 #endif 234 235 #ifdef CONFIG_ACPI 236 static const struct acpi_device_id f_sdh30_acpi_ids[] = { 237 { "SCX0002" }, 238 { /* sentinel */ } 239 }; 240 MODULE_DEVICE_TABLE(acpi, f_sdh30_acpi_ids); 241 #endif 242 243 static struct platform_driver sdhci_f_sdh30_driver = { 244 .driver = { 245 .name = "f_sdh30", 246 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 247 .of_match_table = of_match_ptr(f_sdh30_dt_ids), 248 .acpi_match_table = ACPI_PTR(f_sdh30_acpi_ids), 249 .pm = &sdhci_pltfm_pmops, 250 }, 251 .probe = sdhci_f_sdh30_probe, 252 .remove = sdhci_f_sdh30_remove, 253 }; 254 255 module_platform_driver(sdhci_f_sdh30_driver); 256 257 MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver"); 258 MODULE_LICENSE("GPL v2"); 259 MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD., Socionext Inc."); 260 MODULE_ALIAS("platform:f_sdh30"); 261