// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2017, STMicroelectronics - All Rights Reserved * Author(s): Patrice Chotard, for STMicroelectronics. */ #include #include #include #include #include #include #include #include #include DECLARE_GLOBAL_DATA_PTR; struct sti_sdhci_plat { struct mmc_config cfg; struct mmc mmc; struct reset_ctl reset; int instance; }; /** * sti_mmc_core_config: configure the Arasan HC * @dev : udevice * * Description: this function is to configure the Arasan MMC HC. * This should be called when the system starts in case of, on the SoC, * it is needed to configure the host controller. * This happens on some SoCs, i.e. StiH410, where the MMC0 inside the flashSS * needs to be configured as MMC 4.5 to have full capabilities. * W/o these settings the SDHCI could configure and use the embedded controller * with limited features. */ static int sti_mmc_core_config(struct udevice *dev) { struct sti_sdhci_plat *plat = dev_get_plat(dev); struct sdhci_host *host = dev_get_priv(dev); int ret; /* only MMC1 has a reset line */ if (plat->instance) { ret = reset_deassert(&plat->reset); if (ret < 0) { pr_err("MMC1 deassert failed: %d", ret); return ret; } } writel(STI_FLASHSS_MMC_CORE_CONFIG_1, host->ioaddr + FLASHSS_MMC_CORE_CONFIG_1); if (plat->instance) { writel(STI_FLASHSS_MMC_CORE_CONFIG2, host->ioaddr + FLASHSS_MMC_CORE_CONFIG_2); writel(STI_FLASHSS_MMC_CORE_CONFIG3, host->ioaddr + FLASHSS_MMC_CORE_CONFIG_3); } else { writel(STI_FLASHSS_SDCARD_CORE_CONFIG2, host->ioaddr + FLASHSS_MMC_CORE_CONFIG_2); writel(STI_FLASHSS_SDCARD_CORE_CONFIG3, host->ioaddr + FLASHSS_MMC_CORE_CONFIG_3); } writel(STI_FLASHSS_MMC_CORE_CONFIG4, host->ioaddr + FLASHSS_MMC_CORE_CONFIG_4); return 0; } static int sti_sdhci_probe(struct udevice *dev) { struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev); struct sti_sdhci_plat *plat = dev_get_plat(dev); struct sdhci_host *host = dev_get_priv(dev); int ret; /* * identify current mmc instance, mmc1 has a reset, not mmc0 * MMC0 is wired to the SD slot, * MMC1 is wired on the high speed connector */ ret = reset_get_by_index(dev, 0, &plat->reset); if (!ret) plat->instance = 1; else if (ret == -ENOENT) plat->instance = 0; else return ret; ret = sti_mmc_core_config(dev); if (ret) return ret; host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_32BIT_DMA_ADDR | SDHCI_QUIRK_NO_HISPD_BIT; host->host_caps = MMC_MODE_DDR_52MHz; host->mmc = &plat->mmc; host->mmc->dev = dev; host->mmc->priv = host; ret = sdhci_setup_cfg(&plat->cfg, host, 50000000, 400000); if (ret) return ret; upriv->mmc = host->mmc; return sdhci_probe(dev); } static int sti_sdhci_of_to_plat(struct udevice *dev) { struct sdhci_host *host = dev_get_priv(dev); host->name = strdup(dev->name); host->ioaddr = dev_read_addr_ptr(dev); host->bus_width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "bus-width", 4); return 0; } static int sti_sdhci_bind(struct udevice *dev) { struct sti_sdhci_plat *plat = dev_get_plat(dev); return sdhci_bind(dev, &plat->mmc, &plat->cfg); } static const struct udevice_id sti_sdhci_ids[] = { { .compatible = "st,sdhci" }, { } }; U_BOOT_DRIVER(sti_mmc) = { .name = "sti_sdhci", .id = UCLASS_MMC, .of_match = sti_sdhci_ids, .bind = sti_sdhci_bind, .ops = &sdhci_ops, .of_to_plat = sti_sdhci_of_to_plat, .probe = sti_sdhci_probe, .priv_auto = sizeof(struct sdhci_host), .plat_auto = sizeof(struct sti_sdhci_plat), };