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 unsigned long dw_mci_hi6220_caps[] = { 36 MMC_CAP_CMD23, 37 MMC_CAP_CMD23, 38 0 39 }; 40 41 static void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios) 42 { 43 int ret; 44 45 ret = clk_set_rate(host->ciu_clk, ios->clock); 46 if (ret) 47 dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock); 48 49 host->bus_hz = clk_get_rate(host->ciu_clk); 50 } 51 52 static const struct dw_mci_drv_data k3_drv_data = { 53 .set_ios = dw_mci_k3_set_ios, 54 }; 55 56 static int dw_mci_hi6220_parse_dt(struct dw_mci *host) 57 { 58 struct k3_priv *priv; 59 60 priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL); 61 if (!priv) 62 return -ENOMEM; 63 64 priv->reg = syscon_regmap_lookup_by_phandle(host->dev->of_node, 65 "hisilicon,peripheral-syscon"); 66 if (IS_ERR(priv->reg)) 67 priv->reg = NULL; 68 69 host->priv = priv; 70 return 0; 71 } 72 73 static int dw_mci_hi6220_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios) 74 { 75 struct dw_mci_slot *slot = mmc_priv(mmc); 76 struct k3_priv *priv; 77 struct dw_mci *host; 78 int min_uv, max_uv; 79 int ret; 80 81 host = slot->host; 82 priv = host->priv; 83 84 if (!priv || !priv->reg) 85 return 0; 86 87 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) { 88 ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3, 89 AO_SCTRL_SEL18, 0); 90 min_uv = 3000000; 91 max_uv = 3000000; 92 } else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) { 93 ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3, 94 AO_SCTRL_SEL18, AO_SCTRL_SEL18); 95 min_uv = 1800000; 96 max_uv = 1800000; 97 } else { 98 dev_dbg(host->dev, "voltage not supported\n"); 99 return -EINVAL; 100 } 101 102 if (ret) { 103 dev_dbg(host->dev, "switch voltage failed\n"); 104 return ret; 105 } 106 107 if (IS_ERR_OR_NULL(mmc->supply.vqmmc)) 108 return 0; 109 110 ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv); 111 if (ret) { 112 dev_dbg(host->dev, "Regulator set error %d: %d - %d\n", 113 ret, min_uv, max_uv); 114 return ret; 115 } 116 117 return 0; 118 } 119 120 static void dw_mci_hi6220_set_ios(struct dw_mci *host, struct mmc_ios *ios) 121 { 122 int ret; 123 unsigned int clock; 124 125 clock = (ios->clock <= 25000000) ? 25000000 : ios->clock; 126 127 ret = clk_set_rate(host->biu_clk, clock); 128 if (ret) 129 dev_warn(host->dev, "failed to set rate %uHz\n", clock); 130 131 host->bus_hz = clk_get_rate(host->biu_clk); 132 } 133 134 static int dw_mci_hi6220_execute_tuning(struct dw_mci_slot *slot, u32 opcode) 135 { 136 return 0; 137 } 138 139 static const struct dw_mci_drv_data hi6220_data = { 140 .caps = dw_mci_hi6220_caps, 141 .switch_voltage = dw_mci_hi6220_switch_voltage, 142 .set_ios = dw_mci_hi6220_set_ios, 143 .parse_dt = dw_mci_hi6220_parse_dt, 144 .execute_tuning = dw_mci_hi6220_execute_tuning, 145 }; 146 147 static const struct of_device_id dw_mci_k3_match[] = { 148 { .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, }, 149 { .compatible = "hisilicon,hi6220-dw-mshc", .data = &hi6220_data, }, 150 {}, 151 }; 152 MODULE_DEVICE_TABLE(of, dw_mci_k3_match); 153 154 static int dw_mci_k3_probe(struct platform_device *pdev) 155 { 156 const struct dw_mci_drv_data *drv_data; 157 const struct of_device_id *match; 158 159 match = of_match_node(dw_mci_k3_match, pdev->dev.of_node); 160 drv_data = match->data; 161 162 return dw_mci_pltfm_register(pdev, drv_data); 163 } 164 165 #ifdef CONFIG_PM_SLEEP 166 static int dw_mci_k3_suspend(struct device *dev) 167 { 168 struct dw_mci *host = dev_get_drvdata(dev); 169 int ret; 170 171 ret = dw_mci_suspend(host); 172 if (!ret) 173 clk_disable_unprepare(host->ciu_clk); 174 175 return ret; 176 } 177 178 static int dw_mci_k3_resume(struct device *dev) 179 { 180 struct dw_mci *host = dev_get_drvdata(dev); 181 int ret; 182 183 ret = clk_prepare_enable(host->ciu_clk); 184 if (ret) { 185 dev_err(host->dev, "failed to enable ciu clock\n"); 186 return ret; 187 } 188 189 return dw_mci_resume(host); 190 } 191 #endif /* CONFIG_PM_SLEEP */ 192 193 static SIMPLE_DEV_PM_OPS(dw_mci_k3_pmops, dw_mci_k3_suspend, dw_mci_k3_resume); 194 195 static struct platform_driver dw_mci_k3_pltfm_driver = { 196 .probe = dw_mci_k3_probe, 197 .remove = dw_mci_pltfm_remove, 198 .driver = { 199 .name = "dwmmc_k3", 200 .of_match_table = dw_mci_k3_match, 201 .pm = &dw_mci_k3_pmops, 202 }, 203 }; 204 205 module_platform_driver(dw_mci_k3_pltfm_driver); 206 207 MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension"); 208 MODULE_LICENSE("GPL v2"); 209 MODULE_ALIAS("platform:dwmmc_k3"); 210