1 /* 2 * Copyright (c) 2017 3 * Patrice Chotard <patrice.chotard@st.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0 6 */ 7 8 #include <common.h> 9 #include <dm.h> 10 #include <mmc.h> 11 #include <reset-uclass.h> 12 #include <sdhci.h> 13 #include <asm/arch/sdhci.h> 14 15 DECLARE_GLOBAL_DATA_PTR; 16 17 struct sti_sdhci_plat { 18 struct mmc_config cfg; 19 struct mmc mmc; 20 struct reset_ctl reset; 21 int instance; 22 }; 23 24 /** 25 * sti_mmc_core_config: configure the Arasan HC 26 * @dev : udevice 27 * 28 * Description: this function is to configure the Arasan MMC HC. 29 * This should be called when the system starts in case of, on the SoC, 30 * it is needed to configure the host controller. 31 * This happens on some SoCs, i.e. StiH410, where the MMC0 inside the flashSS 32 * needs to be configured as MMC 4.5 to have full capabilities. 33 * W/o these settings the SDHCI could configure and use the embedded controller 34 * with limited features. 35 */ 36 static int sti_mmc_core_config(struct udevice *dev) 37 { 38 struct sti_sdhci_plat *plat = dev_get_platdata(dev); 39 struct sdhci_host *host = dev_get_priv(dev); 40 int ret; 41 42 /* only MMC1 has a reset line */ 43 if (plat->instance) { 44 ret = reset_deassert(&plat->reset); 45 if (ret < 0) { 46 pr_err("MMC1 deassert failed: %d", ret); 47 return ret; 48 } 49 } 50 51 writel(STI_FLASHSS_MMC_CORE_CONFIG_1, 52 host->ioaddr + FLASHSS_MMC_CORE_CONFIG_1); 53 54 if (plat->instance) { 55 writel(STI_FLASHSS_MMC_CORE_CONFIG2, 56 host->ioaddr + FLASHSS_MMC_CORE_CONFIG_2); 57 writel(STI_FLASHSS_MMC_CORE_CONFIG3, 58 host->ioaddr + FLASHSS_MMC_CORE_CONFIG_3); 59 } else { 60 writel(STI_FLASHSS_SDCARD_CORE_CONFIG2, 61 host->ioaddr + FLASHSS_MMC_CORE_CONFIG_2); 62 writel(STI_FLASHSS_SDCARD_CORE_CONFIG3, 63 host->ioaddr + FLASHSS_MMC_CORE_CONFIG_3); 64 } 65 writel(STI_FLASHSS_MMC_CORE_CONFIG4, 66 host->ioaddr + FLASHSS_MMC_CORE_CONFIG_4); 67 68 return 0; 69 } 70 71 static int sti_sdhci_probe(struct udevice *dev) 72 { 73 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev); 74 struct sti_sdhci_plat *plat = dev_get_platdata(dev); 75 struct sdhci_host *host = dev_get_priv(dev); 76 int ret; 77 78 /* 79 * identify current mmc instance, mmc1 has a reset, not mmc0 80 * MMC0 is wired to the SD slot, 81 * MMC1 is wired on the high speed connector 82 */ 83 ret = reset_get_by_index(dev, 0, &plat->reset); 84 if (!ret) 85 plat->instance = 1; 86 else 87 if (ret == -ENOENT) 88 plat->instance = 0; 89 else 90 return ret; 91 92 ret = sti_mmc_core_config(dev); 93 if (ret) 94 return ret; 95 96 host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD | 97 SDHCI_QUIRK_32BIT_DMA_ADDR | 98 SDHCI_QUIRK_NO_HISPD_BIT; 99 100 host->host_caps = MMC_MODE_DDR_52MHz; 101 102 ret = sdhci_setup_cfg(&plat->cfg, host, 50000000, 400000); 103 if (ret) 104 return ret; 105 106 host->mmc = &plat->mmc; 107 host->mmc->priv = host; 108 host->mmc->dev = dev; 109 upriv->mmc = host->mmc; 110 111 return sdhci_probe(dev); 112 } 113 114 static int sti_sdhci_ofdata_to_platdata(struct udevice *dev) 115 { 116 struct sdhci_host *host = dev_get_priv(dev); 117 118 host->name = strdup(dev->name); 119 host->ioaddr = (void *)devfdt_get_addr(dev); 120 121 host->bus_width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), 122 "bus-width", 4); 123 124 return 0; 125 } 126 127 static int sti_sdhci_bind(struct udevice *dev) 128 { 129 struct sti_sdhci_plat *plat = dev_get_platdata(dev); 130 131 return sdhci_bind(dev, &plat->mmc, &plat->cfg); 132 } 133 134 static const struct udevice_id sti_sdhci_ids[] = { 135 { .compatible = "st,sdhci" }, 136 { } 137 }; 138 139 U_BOOT_DRIVER(sti_mmc) = { 140 .name = "sti_sdhci", 141 .id = UCLASS_MMC, 142 .of_match = sti_sdhci_ids, 143 .bind = sti_sdhci_bind, 144 .ops = &sdhci_ops, 145 .ofdata_to_platdata = sti_sdhci_ofdata_to_platdata, 146 .probe = sti_sdhci_probe, 147 .priv_auto_alloc_size = sizeof(struct sdhci_host), 148 .platdata_auto_alloc_size = sizeof(struct sti_sdhci_plat), 149 }; 150