1 /* 2 * Qualcomm SDHCI driver - SD/eMMC controller 3 * 4 * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com> 5 * 6 * Based on Linux driver 7 * 8 * SPDX-License-Identifier: GPL-2.0+ 9 */ 10 11 #include <common.h> 12 #include <clk.h> 13 #include <dm.h> 14 #include <sdhci.h> 15 #include <wait_bit.h> 16 #include <asm/io.h> 17 #include <linux/bitops.h> 18 19 /* Non-standard registers needed for SDHCI startup */ 20 #define SDCC_MCI_POWER 0x0 21 #define SDCC_MCI_POWER_SW_RST BIT(7) 22 23 /* This is undocumented register */ 24 #define SDCC_MCI_VERSION 0x50 25 #define SDCC_MCI_VERSION_MAJOR_SHIFT 28 26 #define SDCC_MCI_VERSION_MAJOR_MASK (0xf << SDCC_MCI_VERSION_MAJOR_SHIFT) 27 #define SDCC_MCI_VERSION_MINOR_MASK 0xff 28 29 #define SDCC_MCI_STATUS2 0x6C 30 #define SDCC_MCI_STATUS2_MCI_ACT 0x1 31 #define SDCC_MCI_HC_MODE 0x78 32 33 /* Offset to SDHCI registers */ 34 #define SDCC_SDHCI_OFFSET 0x900 35 36 /* Non standard (?) SDHCI register */ 37 #define SDHCI_VENDOR_SPEC_CAPABILITIES0 0x11c 38 39 struct msm_sdhc_plat { 40 struct mmc_config cfg; 41 struct mmc mmc; 42 }; 43 44 struct msm_sdhc { 45 struct sdhci_host host; 46 void *base; 47 }; 48 49 DECLARE_GLOBAL_DATA_PTR; 50 51 static int msm_sdc_clk_init(struct udevice *dev) 52 { 53 uint clk_rate = fdtdec_get_uint(gd->fdt_blob, dev->of_offset, 54 "clock-frequency", 400000); 55 uint clkd[2]; /* clk_id and clk_no */ 56 int clk_offset; 57 struct udevice *clk_dev; 58 struct clk clk; 59 int ret; 60 61 ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, "clock", clkd, 62 2); 63 if (ret) 64 return ret; 65 66 clk_offset = fdt_node_offset_by_phandle(gd->fdt_blob, clkd[0]); 67 if (clk_offset < 0) 68 return clk_offset; 69 70 ret = uclass_get_device_by_of_offset(UCLASS_CLK, clk_offset, &clk_dev); 71 if (ret) 72 return ret; 73 74 clk.id = clkd[1]; 75 ret = clk_request(clk_dev, &clk); 76 if (ret < 0) 77 return ret; 78 79 ret = clk_set_rate(&clk, clk_rate); 80 clk_free(&clk); 81 if (ret < 0) 82 return ret; 83 84 return 0; 85 } 86 87 static int msm_sdc_probe(struct udevice *dev) 88 { 89 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev); 90 struct msm_sdhc_plat *plat = dev_get_platdata(dev); 91 struct msm_sdhc *prv = dev_get_priv(dev); 92 struct sdhci_host *host = &prv->host; 93 u32 core_version, core_minor, core_major; 94 u32 caps; 95 int ret; 96 97 host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_BROKEN_R1B; 98 99 /* Init clocks */ 100 ret = msm_sdc_clk_init(dev); 101 if (ret) 102 return ret; 103 104 /* Reset the core and Enable SDHC mode */ 105 writel(readl(prv->base + SDCC_MCI_POWER) | SDCC_MCI_POWER_SW_RST, 106 prv->base + SDCC_MCI_POWER); 107 108 109 /* Wait for reset to be written to register */ 110 if (wait_for_bit(__func__, prv->base + SDCC_MCI_STATUS2, 111 SDCC_MCI_STATUS2_MCI_ACT, false, 10, false)) { 112 printf("msm_sdhci: reset request failed\n"); 113 return -EIO; 114 } 115 116 /* SW reset can take upto 10HCLK + 15MCLK cycles. (min 40us) */ 117 if (wait_for_bit(__func__, prv->base + SDCC_MCI_POWER, 118 SDCC_MCI_POWER_SW_RST, false, 2, false)) { 119 printf("msm_sdhci: stuck in reset\n"); 120 return -ETIMEDOUT; 121 } 122 123 /* Enable host-controller mode */ 124 writel(1, prv->base + SDCC_MCI_HC_MODE); 125 126 core_version = readl(prv->base + SDCC_MCI_VERSION); 127 128 core_major = (core_version & SDCC_MCI_VERSION_MAJOR_MASK); 129 core_major >>= SDCC_MCI_VERSION_MAJOR_SHIFT; 130 131 core_minor = core_version & SDCC_MCI_VERSION_MINOR_MASK; 132 133 /* 134 * Support for some capabilities is not advertised by newer 135 * controller versions and must be explicitly enabled. 136 */ 137 if (core_major >= 1 && core_minor != 0x11 && core_minor != 0x12) { 138 caps = readl(host->ioaddr + SDHCI_CAPABILITIES); 139 caps |= SDHCI_CAN_VDD_300 | SDHCI_CAN_DO_8BIT; 140 writel(caps, host->ioaddr + SDHCI_VENDOR_SPEC_CAPABILITIES0); 141 } 142 143 ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0); 144 host->mmc = &plat->mmc; 145 if (ret) 146 return ret; 147 host->mmc->priv = &prv->host; 148 host->mmc->dev = dev; 149 upriv->mmc = host->mmc; 150 151 return sdhci_probe(dev); 152 } 153 154 static int msm_sdc_remove(struct udevice *dev) 155 { 156 struct msm_sdhc *priv = dev_get_priv(dev); 157 158 /* Disable host-controller mode */ 159 writel(0, priv->base + SDCC_MCI_HC_MODE); 160 161 return 0; 162 } 163 164 static int msm_ofdata_to_platdata(struct udevice *dev) 165 { 166 struct udevice *parent = dev->parent; 167 struct msm_sdhc *priv = dev_get_priv(dev); 168 struct sdhci_host *host = &priv->host; 169 170 host->name = strdup(dev->name); 171 host->ioaddr = (void *)dev_get_addr(dev); 172 host->bus_width = fdtdec_get_int(gd->fdt_blob, dev->of_offset, 173 "bus-width", 4); 174 host->index = fdtdec_get_uint(gd->fdt_blob, dev->of_offset, "index", 0); 175 priv->base = (void *)fdtdec_get_addr_size_auto_parent(gd->fdt_blob, 176 parent->of_offset, 177 dev->of_offset, 178 "reg", 1, NULL, 179 false); 180 if (priv->base == (void *)FDT_ADDR_T_NONE || 181 host->ioaddr == (void *)FDT_ADDR_T_NONE) 182 return -EINVAL; 183 184 return 0; 185 } 186 187 static int msm_sdc_bind(struct udevice *dev) 188 { 189 struct msm_sdhc_plat *plat = dev_get_platdata(dev); 190 191 return sdhci_bind(dev, &plat->mmc, &plat->cfg); 192 } 193 194 static const struct udevice_id msm_mmc_ids[] = { 195 { .compatible = "qcom,sdhci-msm-v4" }, 196 { } 197 }; 198 199 U_BOOT_DRIVER(msm_sdc_drv) = { 200 .name = "msm_sdc", 201 .id = UCLASS_MMC, 202 .of_match = msm_mmc_ids, 203 .ofdata_to_platdata = msm_ofdata_to_platdata, 204 .ops = &sdhci_ops, 205 .bind = msm_sdc_bind, 206 .probe = msm_sdc_probe, 207 .remove = msm_sdc_remove, 208 .priv_auto_alloc_size = sizeof(struct msm_sdhc), 209 .platdata_auto_alloc_size = sizeof(struct msm_sdhc_plat), 210 }; 211