1 /* 2 * Copyright (c) 2013 Linaro Ltd. 3 * Copyright (c) 2013 Hisilicon Limited. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 */ 10 11 #include <linux/clk.h> 12 #include <linux/mfd/syscon.h> 13 #include <linux/mmc/host.h> 14 #include <linux/mmc/dw_mmc.h> 15 #include <linux/module.h> 16 #include <linux/of_address.h> 17 #include <linux/platform_device.h> 18 #include <linux/regmap.h> 19 #include <linux/regulator/consumer.h> 20 21 #include "dw_mmc.h" 22 #include "dw_mmc-pltfm.h" 23 24 /* 25 * hi6220 sd only support io voltage 1.8v and 3v 26 * Also need config AO_SCTRL_SEL18 accordingly 27 */ 28 #define AO_SCTRL_SEL18 BIT(10) 29 #define AO_SCTRL_CTRL3 0x40C 30 31 struct k3_priv { 32 struct regmap *reg; 33 }; 34 35 static void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios) 36 { 37 int ret; 38 39 ret = clk_set_rate(host->ciu_clk, ios->clock); 40 if (ret) 41 dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock); 42 43 host->bus_hz = clk_get_rate(host->ciu_clk); 44 } 45 46 static const struct dw_mci_drv_data k3_drv_data = { 47 .set_ios = dw_mci_k3_set_ios, 48 }; 49 50 static int dw_mci_hi6220_parse_dt(struct dw_mci *host) 51 { 52 struct k3_priv *priv; 53 54 priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL); 55 if (!priv) 56 return -ENOMEM; 57 58 priv->reg = syscon_regmap_lookup_by_phandle(host->dev->of_node, 59 "hisilicon,peripheral-syscon"); 60 if (IS_ERR(priv->reg)) 61 priv->reg = NULL; 62 63 host->priv = priv; 64 return 0; 65 } 66 67 static int dw_mci_hi6220_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios) 68 { 69 struct dw_mci_slot *slot = mmc_priv(mmc); 70 struct k3_priv *priv; 71 struct dw_mci *host; 72 int min_uv, max_uv; 73 int ret; 74 75 host = slot->host; 76 priv = host->priv; 77 78 if (!priv || !priv->reg) 79 return 0; 80 81 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) { 82 ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3, 83 AO_SCTRL_SEL18, 0); 84 min_uv = 3000000; 85 max_uv = 3000000; 86 } else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) { 87 ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3, 88 AO_SCTRL_SEL18, AO_SCTRL_SEL18); 89 min_uv = 1800000; 90 max_uv = 1800000; 91 } else { 92 dev_dbg(host->dev, "voltage not supported\n"); 93 return -EINVAL; 94 } 95 96 if (ret) { 97 dev_dbg(host->dev, "switch voltage failed\n"); 98 return ret; 99 } 100 101 if (IS_ERR_OR_NULL(mmc->supply.vqmmc)) 102 return 0; 103 104 ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv); 105 if (ret) { 106 dev_dbg(host->dev, "Regulator set error %d: %d - %d\n", 107 ret, min_uv, max_uv); 108 return ret; 109 } 110 111 return 0; 112 } 113 114 static void dw_mci_hi6220_set_ios(struct dw_mci *host, struct mmc_ios *ios) 115 { 116 int ret; 117 unsigned int clock; 118 119 clock = (ios->clock <= 25000000) ? 25000000 : ios->clock; 120 121 ret = clk_set_rate(host->biu_clk, clock); 122 if (ret) 123 dev_warn(host->dev, "failed to set rate %uHz\n", clock); 124 125 host->bus_hz = clk_get_rate(host->biu_clk); 126 } 127 128 static const struct dw_mci_drv_data hi6220_data = { 129 .switch_voltage = dw_mci_hi6220_switch_voltage, 130 .set_ios = dw_mci_hi6220_set_ios, 131 .parse_dt = dw_mci_hi6220_parse_dt, 132 }; 133 134 static const struct of_device_id dw_mci_k3_match[] = { 135 { .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, }, 136 { .compatible = "hisilicon,hi6220-dw-mshc", .data = &hi6220_data, }, 137 {}, 138 }; 139 MODULE_DEVICE_TABLE(of, dw_mci_k3_match); 140 141 static int dw_mci_k3_probe(struct platform_device *pdev) 142 { 143 const struct dw_mci_drv_data *drv_data; 144 const struct of_device_id *match; 145 146 match = of_match_node(dw_mci_k3_match, pdev->dev.of_node); 147 drv_data = match->data; 148 149 return dw_mci_pltfm_register(pdev, drv_data); 150 } 151 152 #ifdef CONFIG_PM_SLEEP 153 static int dw_mci_k3_suspend(struct device *dev) 154 { 155 struct dw_mci *host = dev_get_drvdata(dev); 156 int ret; 157 158 ret = dw_mci_suspend(host); 159 if (!ret) 160 clk_disable_unprepare(host->ciu_clk); 161 162 return ret; 163 } 164 165 static int dw_mci_k3_resume(struct device *dev) 166 { 167 struct dw_mci *host = dev_get_drvdata(dev); 168 int ret; 169 170 ret = clk_prepare_enable(host->ciu_clk); 171 if (ret) { 172 dev_err(host->dev, "failed to enable ciu clock\n"); 173 return ret; 174 } 175 176 return dw_mci_resume(host); 177 } 178 #endif /* CONFIG_PM_SLEEP */ 179 180 static SIMPLE_DEV_PM_OPS(dw_mci_k3_pmops, dw_mci_k3_suspend, dw_mci_k3_resume); 181 182 static struct platform_driver dw_mci_k3_pltfm_driver = { 183 .probe = dw_mci_k3_probe, 184 .remove = dw_mci_pltfm_remove, 185 .driver = { 186 .name = "dwmmc_k3", 187 .of_match_table = dw_mci_k3_match, 188 .pm = &dw_mci_k3_pmops, 189 }, 190 }; 191 192 module_platform_driver(dw_mci_k3_pltfm_driver); 193 194 MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension"); 195 MODULE_LICENSE("GPL v2"); 196 MODULE_ALIAS("platform:dwmmc-k3"); 197