1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2018 HiSilicon Technologies Co., Ltd. 4 */ 5 6 #include <linux/clk.h> 7 #include <linux/mfd/syscon.h> 8 #include <linux/mmc/host.h> 9 #include <linux/module.h> 10 #include <linux/of_address.h> 11 #include <linux/platform_device.h> 12 #include <linux/pm_runtime.h> 13 #include <linux/regmap.h> 14 #include <linux/regulator/consumer.h> 15 16 #include "dw_mmc.h" 17 #include "dw_mmc-pltfm.h" 18 19 #define ALL_INT_CLR 0x1ffff 20 21 struct hi3798cv200_priv { 22 struct clk *sample_clk; 23 struct clk *drive_clk; 24 }; 25 26 static void dw_mci_hi3798cv200_set_ios(struct dw_mci *host, struct mmc_ios *ios) 27 { 28 struct hi3798cv200_priv *priv = host->priv; 29 u32 val; 30 31 val = mci_readl(host, UHS_REG); 32 if (ios->timing == MMC_TIMING_MMC_DDR52 || 33 ios->timing == MMC_TIMING_UHS_DDR50) 34 val |= SDMMC_UHS_DDR; 35 else 36 val &= ~SDMMC_UHS_DDR; 37 mci_writel(host, UHS_REG, val); 38 39 val = mci_readl(host, ENABLE_SHIFT); 40 if (ios->timing == MMC_TIMING_MMC_DDR52) 41 val |= SDMMC_ENABLE_PHASE; 42 else 43 val &= ~SDMMC_ENABLE_PHASE; 44 mci_writel(host, ENABLE_SHIFT, val); 45 46 val = mci_readl(host, DDR_REG); 47 if (ios->timing == MMC_TIMING_MMC_HS400) 48 val |= SDMMC_DDR_HS400; 49 else 50 val &= ~SDMMC_DDR_HS400; 51 mci_writel(host, DDR_REG, val); 52 53 if (ios->timing == MMC_TIMING_MMC_HS || 54 ios->timing == MMC_TIMING_LEGACY) 55 clk_set_phase(priv->drive_clk, 180); 56 else if (ios->timing == MMC_TIMING_MMC_HS200) 57 clk_set_phase(priv->drive_clk, 135); 58 } 59 60 static int dw_mci_hi3798cv200_execute_tuning(struct dw_mci_slot *slot, 61 u32 opcode) 62 { 63 static const int degrees[] = { 0, 45, 90, 135, 180, 225, 270, 315 }; 64 struct dw_mci *host = slot->host; 65 struct hi3798cv200_priv *priv = host->priv; 66 int raise_point = -1, fall_point = -1; 67 int err, prev_err = -1; 68 int found = 0; 69 int i; 70 71 for (i = 0; i < ARRAY_SIZE(degrees); i++) { 72 clk_set_phase(priv->sample_clk, degrees[i]); 73 mci_writel(host, RINTSTS, ALL_INT_CLR); 74 75 err = mmc_send_tuning(slot->mmc, opcode, NULL); 76 if (!err) 77 found = 1; 78 79 if (i > 0) { 80 if (err && !prev_err) 81 fall_point = i - 1; 82 if (!err && prev_err) 83 raise_point = i; 84 } 85 86 if (raise_point != -1 && fall_point != -1) 87 goto tuning_out; 88 89 prev_err = err; 90 } 91 92 tuning_out: 93 if (found) { 94 if (raise_point == -1) 95 raise_point = 0; 96 if (fall_point == -1) 97 fall_point = ARRAY_SIZE(degrees) - 1; 98 if (fall_point < raise_point) { 99 if ((raise_point + fall_point) > 100 (ARRAY_SIZE(degrees) - 1)) 101 i = fall_point / 2; 102 else 103 i = (raise_point + ARRAY_SIZE(degrees) - 1) / 2; 104 } else { 105 i = (raise_point + fall_point) / 2; 106 } 107 108 clk_set_phase(priv->sample_clk, degrees[i]); 109 dev_dbg(host->dev, "Tuning clk_sample[%d, %d], set[%d]\n", 110 raise_point, fall_point, degrees[i]); 111 } else { 112 dev_err(host->dev, "No valid clk_sample shift! use default\n"); 113 err = -EINVAL; 114 } 115 116 mci_writel(host, RINTSTS, ALL_INT_CLR); 117 return err; 118 } 119 120 static int dw_mci_hi3798cv200_init(struct dw_mci *host) 121 { 122 struct hi3798cv200_priv *priv; 123 int ret; 124 125 priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL); 126 if (!priv) 127 return -ENOMEM; 128 129 priv->sample_clk = devm_clk_get(host->dev, "ciu-sample"); 130 if (IS_ERR(priv->sample_clk)) { 131 dev_err(host->dev, "failed to get ciu-sample clock\n"); 132 return PTR_ERR(priv->sample_clk); 133 } 134 135 priv->drive_clk = devm_clk_get(host->dev, "ciu-drive"); 136 if (IS_ERR(priv->drive_clk)) { 137 dev_err(host->dev, "failed to get ciu-drive clock\n"); 138 return PTR_ERR(priv->drive_clk); 139 } 140 141 ret = clk_prepare_enable(priv->sample_clk); 142 if (ret) { 143 dev_err(host->dev, "failed to enable ciu-sample clock\n"); 144 return ret; 145 } 146 147 ret = clk_prepare_enable(priv->drive_clk); 148 if (ret) { 149 dev_err(host->dev, "failed to enable ciu-drive clock\n"); 150 goto disable_sample_clk; 151 } 152 153 host->priv = priv; 154 return 0; 155 156 disable_sample_clk: 157 clk_disable_unprepare(priv->sample_clk); 158 return ret; 159 } 160 161 static const struct dw_mci_drv_data hi3798cv200_data = { 162 .common_caps = MMC_CAP_CMD23, 163 .init = dw_mci_hi3798cv200_init, 164 .set_ios = dw_mci_hi3798cv200_set_ios, 165 .execute_tuning = dw_mci_hi3798cv200_execute_tuning, 166 }; 167 168 static int dw_mci_hi3798cv200_probe(struct platform_device *pdev) 169 { 170 return dw_mci_pltfm_register(pdev, &hi3798cv200_data); 171 } 172 173 static void dw_mci_hi3798cv200_remove(struct platform_device *pdev) 174 { 175 struct dw_mci *host = platform_get_drvdata(pdev); 176 struct hi3798cv200_priv *priv = host->priv; 177 178 clk_disable_unprepare(priv->drive_clk); 179 clk_disable_unprepare(priv->sample_clk); 180 181 dw_mci_pltfm_remove(pdev); 182 } 183 184 static const struct of_device_id dw_mci_hi3798cv200_match[] = { 185 { .compatible = "hisilicon,hi3798cv200-dw-mshc", }, 186 {}, 187 }; 188 189 MODULE_DEVICE_TABLE(of, dw_mci_hi3798cv200_match); 190 static struct platform_driver dw_mci_hi3798cv200_driver = { 191 .probe = dw_mci_hi3798cv200_probe, 192 .remove = dw_mci_hi3798cv200_remove, 193 .driver = { 194 .name = "dwmmc_hi3798cv200", 195 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 196 .of_match_table = dw_mci_hi3798cv200_match, 197 }, 198 }; 199 module_platform_driver(dw_mci_hi3798cv200_driver); 200 201 MODULE_DESCRIPTION("HiSilicon Hi3798CV200 Specific DW-MSHC Driver Extension"); 202 MODULE_LICENSE("GPL v2"); 203