// SPDX-License-Identifier: GPL-2.0-or-later /* * drivers/mmc/host/sdhci-of-sparx5.c * * MCHP Sparx5 SoC Secure Digital Host Controller Interface. * * Copyright (c) 2019 Microchip Inc. * * Author: Lars Povlsen */ #include #include #include #include #include #include #include #include "sdhci-pltfm.h" #define CPU_REGS_GENERAL_CTRL (0x22 * 4) #define MSHC_DLY_CC_MASK GENMASK(16, 13) #define MSHC_DLY_CC_SHIFT 13 #define MSHC_DLY_CC_MAX 15 #define CPU_REGS_PROC_CTRL (0x2C * 4) #define ACP_CACHE_FORCE_ENA BIT(4) #define ACP_AWCACHE BIT(3) #define ACP_ARCACHE BIT(2) #define ACP_CACHE_MASK (ACP_CACHE_FORCE_ENA|ACP_AWCACHE|ACP_ARCACHE) #define MSHC2_VERSION 0x500 /* Off 0x140, reg 0x0 */ #define MSHC2_TYPE 0x504 /* Off 0x140, reg 0x1 */ #define MSHC2_EMMC_CTRL 0x52c /* Off 0x140, reg 0xB */ #define MSHC2_EMMC_CTRL_EMMC_RST_N BIT(2) #define MSHC2_EMMC_CTRL_IS_EMMC BIT(0) struct sdhci_sparx5_data { struct sdhci_host *host; struct regmap *cpu_ctrl; int delay_clock; }; #define BOUNDARY_OK(addr, len) \ ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1))) /* * If DMA addr spans 128MB boundary, we split the DMA transfer into two * so that each DMA transfer doesn't exceed the boundary. */ static void sdhci_sparx5_adma_write_desc(struct sdhci_host *host, void **desc, dma_addr_t addr, int len, unsigned int cmd) { int tmplen, offset; if (likely(!len || BOUNDARY_OK(addr, len))) { sdhci_adma_write_desc(host, desc, addr, len, cmd); return; } pr_debug("%s: write_desc: splitting dma len %d, offset 0x%0llx\n", mmc_hostname(host->mmc), len, addr); offset = addr & (SZ_128M - 1); tmplen = SZ_128M - offset; sdhci_adma_write_desc(host, desc, addr, tmplen, cmd); addr += tmplen; len -= tmplen; sdhci_adma_write_desc(host, desc, addr, len, cmd); } static void sparx5_set_cacheable(struct sdhci_host *host, u32 value) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_sparx5_data *sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host); pr_debug("%s: Set Cacheable = 0x%x\n", mmc_hostname(host->mmc), value); /* Update ACP caching attributes in HW */ regmap_update_bits(sdhci_sparx5->cpu_ctrl, CPU_REGS_PROC_CTRL, ACP_CACHE_MASK, value); } static void sparx5_set_delay(struct sdhci_host *host, u8 value) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_sparx5_data *sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host); pr_debug("%s: Set DLY_CC = %u\n", mmc_hostname(host->mmc), value); /* Update DLY_CC in HW */ regmap_update_bits(sdhci_sparx5->cpu_ctrl, CPU_REGS_GENERAL_CTRL, MSHC_DLY_CC_MASK, (value << MSHC_DLY_CC_SHIFT)); } static void sdhci_sparx5_set_emmc(struct sdhci_host *host) { if (!mmc_card_is_removable(host->mmc)) { u8 value; value = sdhci_readb(host, MSHC2_EMMC_CTRL); if (!(value & MSHC2_EMMC_CTRL_IS_EMMC)) { value |= MSHC2_EMMC_CTRL_IS_EMMC; pr_debug("%s: Set EMMC_CTRL: 0x%08x\n", mmc_hostname(host->mmc), value); sdhci_writeb(host, value, MSHC2_EMMC_CTRL); } } } static void sdhci_sparx5_reset_emmc(struct sdhci_host *host) { u8 value; pr_debug("%s: Toggle EMMC_CTRL.EMMC_RST_N\n", mmc_hostname(host->mmc)); value = sdhci_readb(host, MSHC2_EMMC_CTRL) & ~MSHC2_EMMC_CTRL_EMMC_RST_N; sdhci_writeb(host, value, MSHC2_EMMC_CTRL); /* For eMMC, minimum is 1us but give it 10us for good measure */ usleep_range(10, 20); sdhci_writeb(host, value | MSHC2_EMMC_CTRL_EMMC_RST_N, MSHC2_EMMC_CTRL); /* For eMMC, minimum is 200us but give it 300us for good measure */ usleep_range(300, 400); } static void sdhci_sparx5_reset(struct sdhci_host *host, u8 mask) { pr_debug("%s: *** RESET: mask %d\n", mmc_hostname(host->mmc), mask); sdhci_reset(host, mask); /* Be sure CARD_IS_EMMC stays set */ sdhci_sparx5_set_emmc(host); } static const struct sdhci_ops sdhci_sparx5_ops = { .set_clock = sdhci_set_clock, .set_bus_width = sdhci_set_bus_width, .set_uhs_signaling = sdhci_set_uhs_signaling, .get_max_clock = sdhci_pltfm_clk_get_max_clock, .reset = sdhci_sparx5_reset, .adma_write_desc = sdhci_sparx5_adma_write_desc, }; static const struct sdhci_pltfm_data sdhci_sparx5_pdata = { .quirks = 0, .quirks2 = SDHCI_QUIRK2_HOST_NO_CMD23 | /* Controller issue */ SDHCI_QUIRK2_NO_1_8_V, /* No sdr104, ddr50, etc */ .ops = &sdhci_sparx5_ops, }; static int sdhci_sparx5_probe(struct platform_device *pdev) { int ret; const char *syscon = "microchip,sparx5-cpu-syscon"; struct sdhci_host *host; struct sdhci_pltfm_host *pltfm_host; struct sdhci_sparx5_data *sdhci_sparx5; struct device_node *np = pdev->dev.of_node; u32 value; u32 extra; host = sdhci_pltfm_init(pdev, &sdhci_sparx5_pdata, sizeof(*sdhci_sparx5)); if (IS_ERR(host)) return PTR_ERR(host); /* * extra adma table cnt for cross 128M boundary handling. */ extra = DIV_ROUND_UP_ULL(dma_get_required_mask(&pdev->dev), SZ_128M); if (extra > SDHCI_MAX_SEGS) extra = SDHCI_MAX_SEGS; host->adma_table_cnt += extra; pltfm_host = sdhci_priv(host); sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host); sdhci_sparx5->host = host; pltfm_host->clk = devm_clk_get(&pdev->dev, "core"); if (IS_ERR(pltfm_host->clk)) { ret = PTR_ERR(pltfm_host->clk); dev_err(&pdev->dev, "failed to get core clk: %d\n", ret); goto free_pltfm; } ret = clk_prepare_enable(pltfm_host->clk); if (ret) goto free_pltfm; if (!of_property_read_u32(np, "microchip,clock-delay", &value) && (value > 0 && value <= MSHC_DLY_CC_MAX)) sdhci_sparx5->delay_clock = value; sdhci_get_of_property(pdev); ret = mmc_of_parse(host->mmc); if (ret) goto err_clk; sdhci_sparx5->cpu_ctrl = syscon_regmap_lookup_by_compatible(syscon); if (IS_ERR(sdhci_sparx5->cpu_ctrl)) { dev_err(&pdev->dev, "No CPU syscon regmap !\n"); ret = PTR_ERR(sdhci_sparx5->cpu_ctrl); goto err_clk; } if (sdhci_sparx5->delay_clock >= 0) sparx5_set_delay(host, sdhci_sparx5->delay_clock); if (!mmc_card_is_removable(host->mmc)) { /* Do a HW reset of eMMC card */ sdhci_sparx5_reset_emmc(host); /* Update EMMC_CTRL */ sdhci_sparx5_set_emmc(host); /* If eMMC, disable SD and SDIO */ host->mmc->caps2 |= (MMC_CAP2_NO_SDIO|MMC_CAP2_NO_SD); } ret = sdhci_add_host(host); if (ret) goto err_clk; /* Set AXI bus master to use un-cached access (for DMA) */ if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA) && IS_ENABLED(CONFIG_DMA_DECLARE_COHERENT)) sparx5_set_cacheable(host, ACP_CACHE_FORCE_ENA); pr_debug("%s: SDHC version: 0x%08x\n", mmc_hostname(host->mmc), sdhci_readl(host, MSHC2_VERSION)); pr_debug("%s: SDHC type: 0x%08x\n", mmc_hostname(host->mmc), sdhci_readl(host, MSHC2_TYPE)); return ret; err_clk: clk_disable_unprepare(pltfm_host->clk); free_pltfm: sdhci_pltfm_free(pdev); return ret; } static const struct of_device_id sdhci_sparx5_of_match[] = { { .compatible = "microchip,dw-sparx5-sdhci" }, { } }; MODULE_DEVICE_TABLE(of, sdhci_sparx5_of_match); static struct platform_driver sdhci_sparx5_driver = { .driver = { .name = "sdhci-sparx5", .of_match_table = sdhci_sparx5_of_match, .pm = &sdhci_pltfm_pmops, }, .probe = sdhci_sparx5_probe, .remove = sdhci_pltfm_unregister, }; module_platform_driver(sdhci_sparx5_driver); MODULE_DESCRIPTION("Sparx5 SDHCI OF driver"); MODULE_AUTHOR("Lars Povlsen "); MODULE_LICENSE("GPL v2");