1 /* 2 * linux/drivers/mmc/host/sdhci_f_sdh30.c 3 * 4 * Copyright (C) 2013 - 2015 Fujitsu Semiconductor, Ltd 5 * Vincent Yang <vincent.yang@tw.fujitsu.com> 6 * Copyright (C) 2015 Linaro Ltd Andy Green <andy.green@linaro.org> 7 * 8 * This program is free software: you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation, version 2 of the License. 11 */ 12 13 #include <linux/err.h> 14 #include <linux/delay.h> 15 #include <linux/module.h> 16 #include <linux/clk.h> 17 18 #include "sdhci-pltfm.h" 19 20 /* F_SDH30 extended Controller registers */ 21 #define F_SDH30_AHB_CONFIG 0x100 22 #define F_SDH30_AHB_BIGED 0x00000040 23 #define F_SDH30_BUSLOCK_DMA 0x00000020 24 #define F_SDH30_BUSLOCK_EN 0x00000010 25 #define F_SDH30_SIN 0x00000008 26 #define F_SDH30_AHB_INCR_16 0x00000004 27 #define F_SDH30_AHB_INCR_8 0x00000002 28 #define F_SDH30_AHB_INCR_4 0x00000001 29 30 #define F_SDH30_TUNING_SETTING 0x108 31 #define F_SDH30_CMD_CHK_DIS 0x00010000 32 33 #define F_SDH30_IO_CONTROL2 0x114 34 #define F_SDH30_CRES_O_DN 0x00080000 35 #define F_SDH30_MSEL_O_1_8 0x00040000 36 37 #define F_SDH30_ESD_CONTROL 0x124 38 #define F_SDH30_EMMC_RST 0x00000002 39 #define F_SDH30_EMMC_HS200 0x01000000 40 41 #define F_SDH30_CMD_DAT_DELAY 0x200 42 43 #define F_SDH30_MIN_CLOCK 400000 44 45 struct f_sdhost_priv { 46 struct clk *clk_iface; 47 struct clk *clk; 48 u32 vendor_hs200; 49 struct device *dev; 50 }; 51 52 void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host) 53 { 54 struct f_sdhost_priv *priv = sdhci_priv(host); 55 u32 ctrl = 0; 56 57 usleep_range(2500, 3000); 58 ctrl = sdhci_readl(host, F_SDH30_IO_CONTROL2); 59 ctrl |= F_SDH30_CRES_O_DN; 60 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 61 ctrl |= F_SDH30_MSEL_O_1_8; 62 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 63 64 ctrl &= ~F_SDH30_CRES_O_DN; 65 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 66 usleep_range(2500, 3000); 67 68 if (priv->vendor_hs200) { 69 dev_info(priv->dev, "%s: setting hs200\n", __func__); 70 ctrl = sdhci_readl(host, F_SDH30_ESD_CONTROL); 71 ctrl |= priv->vendor_hs200; 72 sdhci_writel(host, ctrl, F_SDH30_ESD_CONTROL); 73 } 74 75 ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING); 76 ctrl |= F_SDH30_CMD_CHK_DIS; 77 sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING); 78 } 79 80 unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host) 81 { 82 return F_SDH30_MIN_CLOCK; 83 } 84 85 void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask) 86 { 87 if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0) 88 sdhci_writew(host, 0xBC01, SDHCI_CLOCK_CONTROL); 89 90 sdhci_reset(host, mask); 91 } 92 93 static const struct sdhci_ops sdhci_f_sdh30_ops = { 94 .voltage_switch = sdhci_f_sdh30_soft_voltage_switch, 95 .get_min_clock = sdhci_f_sdh30_get_min_clock, 96 .reset = sdhci_f_sdh30_reset, 97 .set_clock = sdhci_set_clock, 98 .set_bus_width = sdhci_set_bus_width, 99 .set_uhs_signaling = sdhci_set_uhs_signaling, 100 }; 101 102 static int sdhci_f_sdh30_probe(struct platform_device *pdev) 103 { 104 struct sdhci_host *host; 105 struct device *dev = &pdev->dev; 106 struct resource *res; 107 int irq, ctrl = 0, ret = 0; 108 struct f_sdhost_priv *priv; 109 u32 reg = 0; 110 111 irq = platform_get_irq(pdev, 0); 112 if (irq < 0) { 113 dev_err(dev, "%s: no irq specified\n", __func__); 114 return irq; 115 } 116 117 host = sdhci_alloc_host(dev, sizeof(struct sdhci_host) + 118 sizeof(struct f_sdhost_priv)); 119 if (IS_ERR(host)) 120 return PTR_ERR(host); 121 122 priv = sdhci_priv(host); 123 priv->dev = dev; 124 125 host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC | 126 SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 127 host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE | 128 SDHCI_QUIRK2_TUNING_WORK_AROUND; 129 130 ret = mmc_of_parse(host->mmc); 131 if (ret) 132 goto err; 133 134 platform_set_drvdata(pdev, host); 135 136 sdhci_get_of_property(pdev); 137 host->hw_name = "f_sdh30"; 138 host->ops = &sdhci_f_sdh30_ops; 139 host->irq = irq; 140 141 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 142 host->ioaddr = devm_ioremap_resource(&pdev->dev, res); 143 if (IS_ERR(host->ioaddr)) { 144 ret = PTR_ERR(host->ioaddr); 145 goto err; 146 } 147 148 priv->clk_iface = devm_clk_get(&pdev->dev, "iface"); 149 if (IS_ERR(priv->clk_iface)) { 150 ret = PTR_ERR(priv->clk_iface); 151 goto err; 152 } 153 154 ret = clk_prepare_enable(priv->clk_iface); 155 if (ret) 156 goto err; 157 158 priv->clk = devm_clk_get(&pdev->dev, "core"); 159 if (IS_ERR(priv->clk)) { 160 ret = PTR_ERR(priv->clk); 161 goto err_clk; 162 } 163 164 ret = clk_prepare_enable(priv->clk); 165 if (ret) 166 goto err_clk; 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 clk_disable_unprepare(priv->clk); 192 err_clk: 193 clk_disable_unprepare(priv->clk_iface); 194 err: 195 sdhci_free_host(host); 196 return ret; 197 } 198 199 static int sdhci_f_sdh30_remove(struct platform_device *pdev) 200 { 201 struct sdhci_host *host = platform_get_drvdata(pdev); 202 struct f_sdhost_priv *priv = sdhci_priv(host); 203 204 sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) == 205 0xffffffff); 206 207 clk_disable_unprepare(priv->clk_iface); 208 clk_disable_unprepare(priv->clk); 209 210 sdhci_free_host(host); 211 platform_set_drvdata(pdev, NULL); 212 213 return 0; 214 } 215 216 static const struct of_device_id f_sdh30_dt_ids[] = { 217 { .compatible = "fujitsu,mb86s70-sdhci-3.0" }, 218 { /* sentinel */ } 219 }; 220 MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids); 221 222 static struct platform_driver sdhci_f_sdh30_driver = { 223 .driver = { 224 .name = "f_sdh30", 225 .of_match_table = f_sdh30_dt_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