| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Masahiro Yamada | 1358 | 75.82% | 7 | 46.67% |
| Piotr Sroka | 423 | 23.62% | 4 | 26.67% |
| Gustavo A. R. Silva | 4 | 0.22% | 1 | 6.67% |
| Ulf Hansson | 3 | 0.17% | 1 | 6.67% |
| Thomas Gleixner | 2 | 0.11% | 1 | 6.67% |
| Shawn Lin | 1 | 0.06% | 1 | 6.67% |
| Total | 1791 | 15 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2016 Socionext Inc. * Author: Masahiro Yamada <yamada.masahiro@socionext.com> */ #include <linux/bitfield.h> #include <linux/bits.h> #include <linux/iopoll.h> #include <linux/module.h> #include <linux/mmc/host.h> #include <linux/mmc/mmc.h> #include <linux/of.h> #include "sdhci-pltfm.h" /* HRS - Host Register Set (specific to Cadence) */ #define SDHCI_CDNS_HRS04 0x10 /* PHY access port */ #define SDHCI_CDNS_HRS04_ACK BIT(26) #define SDHCI_CDNS_HRS04_RD BIT(25) #define SDHCI_CDNS_HRS04_WR BIT(24) #define SDHCI_CDNS_HRS04_RDATA GENMASK(23, 16) #define SDHCI_CDNS_HRS04_WDATA GENMASK(15, 8) #define SDHCI_CDNS_HRS04_ADDR GENMASK(5, 0) #define SDHCI_CDNS_HRS06 0x18 /* eMMC control */ #define SDHCI_CDNS_HRS06_TUNE_UP BIT(15) #define SDHCI_CDNS_HRS06_TUNE GENMASK(13, 8) #define SDHCI_CDNS_HRS06_MODE GENMASK(2, 0) #define SDHCI_CDNS_HRS06_MODE_SD 0x0 #define SDHCI_CDNS_HRS06_MODE_MMC_SDR 0x2 #define SDHCI_CDNS_HRS06_MODE_MMC_DDR 0x3 #define SDHCI_CDNS_HRS06_MODE_MMC_HS200 0x4 #define SDHCI_CDNS_HRS06_MODE_MMC_HS400 0x5 #define SDHCI_CDNS_HRS06_MODE_MMC_HS400ES 0x6 /* SRS - Slot Register Set (SDHCI-compatible) */ #define SDHCI_CDNS_SRS_BASE 0x200 /* PHY */ #define SDHCI_CDNS_PHY_DLY_SD_HS 0x00 #define SDHCI_CDNS_PHY_DLY_SD_DEFAULT 0x01 #define SDHCI_CDNS_PHY_DLY_UHS_SDR12 0x02 #define SDHCI_CDNS_PHY_DLY_UHS_SDR25 0x03 #define SDHCI_CDNS_PHY_DLY_UHS_SDR50 0x04 #define SDHCI_CDNS_PHY_DLY_UHS_DDR50 0x05 #define SDHCI_CDNS_PHY_DLY_EMMC_LEGACY 0x06 #define SDHCI_CDNS_PHY_DLY_EMMC_SDR 0x07 #define SDHCI_CDNS_PHY_DLY_EMMC_DDR 0x08 #define SDHCI_CDNS_PHY_DLY_SDCLK 0x0b #define SDHCI_CDNS_PHY_DLY_HSMMC 0x0c #define SDHCI_CDNS_PHY_DLY_STROBE 0x0d /* * The tuned val register is 6 bit-wide, but not the whole of the range is * available. The range 0-42 seems to be available (then 43 wraps around to 0) * but I am not quite sure if it is official. Use only 0 to 39 for safety. */ #define SDHCI_CDNS_MAX_TUNING_LOOP 40 struct sdhci_cdns_phy_param { u8 addr; u8 data; }; struct sdhci_cdns_priv { void __iomem *hrs_addr; bool enhanced_strobe; unsigned int nr_phy_params; struct sdhci_cdns_phy_param phy_params[0]; }; struct sdhci_cdns_phy_cfg { const char *property; u8 addr; }; static const struct sdhci_cdns_phy_cfg sdhci_cdns_phy_cfgs[] = { { "cdns,phy-input-delay-sd-highspeed", SDHCI_CDNS_PHY_DLY_SD_HS, }, { "cdns,phy-input-delay-legacy", SDHCI_CDNS_PHY_DLY_SD_DEFAULT, }, { "cdns,phy-input-delay-sd-uhs-sdr12", SDHCI_CDNS_PHY_DLY_UHS_SDR12, }, { "cdns,phy-input-delay-sd-uhs-sdr25", SDHCI_CDNS_PHY_DLY_UHS_SDR25, }, { "cdns,phy-input-delay-sd-uhs-sdr50", SDHCI_CDNS_PHY_DLY_UHS_SDR50, }, { "cdns,phy-input-delay-sd-uhs-ddr50", SDHCI_CDNS_PHY_DLY_UHS_DDR50, }, { "cdns,phy-input-delay-mmc-highspeed", SDHCI_CDNS_PHY_DLY_EMMC_SDR, }, { "cdns,phy-input-delay-mmc-ddr", SDHCI_CDNS_PHY_DLY_EMMC_DDR, }, { "cdns,phy-dll-delay-sdclk", SDHCI_CDNS_PHY_DLY_SDCLK, }, { "cdns,phy-dll-delay-sdclk-hsmmc", SDHCI_CDNS_PHY_DLY_HSMMC, }, { "cdns,phy-dll-delay-strobe", SDHCI_CDNS_PHY_DLY_STROBE, }, }; static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv, u8 addr, u8 data) { void __iomem *reg = priv->hrs_addr + SDHCI_CDNS_HRS04; u32 tmp; int ret; tmp = FIELD_PREP(SDHCI_CDNS_HRS04_WDATA, data) | FIELD_PREP(SDHCI_CDNS_HRS04_ADDR, addr); writel(tmp, reg); tmp |= SDHCI_CDNS_HRS04_WR; writel(tmp, reg); ret = readl_poll_timeout(reg, tmp, tmp & SDHCI_CDNS_HRS04_ACK, 0, 10); if (ret) return ret; tmp &= ~SDHCI_CDNS_HRS04_WR; writel(tmp, reg); return 0; } static unsigned int sdhci_cdns_phy_param_count(struct device_node *np) { unsigned int count = 0; int i; for (i = 0; i < ARRAY_SIZE(sdhci_cdns_phy_cfgs); i++) if (of_property_read_bool(np, sdhci_cdns_phy_cfgs[i].property)) count++; return count; } static void sdhci_cdns_phy_param_parse(struct device_node *np, struct sdhci_cdns_priv *priv) { struct sdhci_cdns_phy_param *p = priv->phy_params; u32 val; int ret, i; for (i = 0; i < ARRAY_SIZE(sdhci_cdns_phy_cfgs); i++) { ret = of_property_read_u32(np, sdhci_cdns_phy_cfgs[i].property, &val); if (ret) continue; p->addr = sdhci_cdns_phy_cfgs[i].addr; p->data = val; p++; } } static int sdhci_cdns_phy_init(struct sdhci_cdns_priv *priv) { int ret, i; for (i = 0; i < priv->nr_phy_params; i++) { ret = sdhci_cdns_write_phy_reg(priv, priv->phy_params[i].addr, priv->phy_params[i].data); if (ret) return ret; } return 0; } static inline void *sdhci_cdns_priv(struct sdhci_host *host) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); return sdhci_pltfm_priv(pltfm_host); } static unsigned int sdhci_cdns_get_timeout_clock(struct sdhci_host *host) { /* * Cadence's spec says the Timeout Clock Frequency is the same as the * Base Clock Frequency. */ return host->max_clk; } static void sdhci_cdns_set_emmc_mode(struct sdhci_cdns_priv *priv, u32 mode) { u32 tmp; /* The speed mode for eMMC is selected by HRS06 register */ tmp = readl(priv->hrs_addr + SDHCI_CDNS_HRS06); tmp &= ~SDHCI_CDNS_HRS06_MODE; tmp |= FIELD_PREP(SDHCI_CDNS_HRS06_MODE, mode); writel(tmp, priv->hrs_addr + SDHCI_CDNS_HRS06); } static u32 sdhci_cdns_get_emmc_mode(struct sdhci_cdns_priv *priv) { u32 tmp; tmp = readl(priv->hrs_addr + SDHCI_CDNS_HRS06); return FIELD_GET(SDHCI_CDNS_HRS06_MODE, tmp); } static void sdhci_cdns_set_uhs_signaling(struct sdhci_host *host, unsigned int timing) { struct sdhci_cdns_priv *priv = sdhci_cdns_priv(host); u32 mode; switch (timing) { case MMC_TIMING_MMC_HS: mode = SDHCI_CDNS_HRS06_MODE_MMC_SDR; break; case MMC_TIMING_MMC_DDR52: mode = SDHCI_CDNS_HRS06_MODE_MMC_DDR; break; case MMC_TIMING_MMC_HS200: mode = SDHCI_CDNS_HRS06_MODE_MMC_HS200; break; case MMC_TIMING_MMC_HS400: if (priv->enhanced_strobe) mode = SDHCI_CDNS_HRS06_MODE_MMC_HS400ES; else mode = SDHCI_CDNS_HRS06_MODE_MMC_HS400; break; default: mode = SDHCI_CDNS_HRS06_MODE_SD; break; } sdhci_cdns_set_emmc_mode(priv, mode); /* For SD, fall back to the default handler */ if (mode == SDHCI_CDNS_HRS06_MODE_SD) sdhci_set_uhs_signaling(host, timing); } static const struct sdhci_ops sdhci_cdns_ops = { .set_clock = sdhci_set_clock, .get_timeout_clock = sdhci_cdns_get_timeout_clock, .set_bus_width = sdhci_set_bus_width, .reset = sdhci_reset, .set_uhs_signaling = sdhci_cdns_set_uhs_signaling, }; static const struct sdhci_pltfm_data sdhci_cdns_pltfm_data = { .ops = &sdhci_cdns_ops, }; static int sdhci_cdns_set_tune_val(struct sdhci_host *host, unsigned int val) { struct sdhci_cdns_priv *priv = sdhci_cdns_priv(host); void __iomem *reg = priv->hrs_addr + SDHCI_CDNS_HRS06; u32 tmp; int i, ret; if (WARN_ON(!FIELD_FIT(SDHCI_CDNS_HRS06_TUNE, val))) return -EINVAL; tmp = readl(reg); tmp &= ~SDHCI_CDNS_HRS06_TUNE; tmp |= FIELD_PREP(SDHCI_CDNS_HRS06_TUNE, val); /* * Workaround for IP errata: * The IP6116 SD/eMMC PHY design has a timing issue on receive data * path. Send tune request twice. */ for (i = 0; i < 2; i++) { tmp |= SDHCI_CDNS_HRS06_TUNE_UP; writel(tmp, reg); ret = readl_poll_timeout(reg, tmp, !(tmp & SDHCI_CDNS_HRS06_TUNE_UP), 0, 1); if (ret) return ret; } return 0; } static int sdhci_cdns_execute_tuning(struct mmc_host *mmc, u32 opcode) { struct sdhci_host *host = mmc_priv(mmc); int cur_streak = 0; int max_streak = 0; int end_of_streak = 0; int i; /* * This handler only implements the eMMC tuning that is specific to * this controller. Fall back to the standard method for SD timing. */ if (host->timing != MMC_TIMING_MMC_HS200) return sdhci_execute_tuning(mmc, opcode); if (WARN_ON(opcode != MMC_SEND_TUNING_BLOCK_HS200)) return -EINVAL; for (i = 0; i < SDHCI_CDNS_MAX_TUNING_LOOP; i++) { if (sdhci_cdns_set_tune_val(host, i) || mmc_send_tuning(host->mmc, opcode, NULL)) { /* bad */ cur_streak = 0; } else { /* good */ cur_streak++; if (cur_streak > max_streak) { max_streak = cur_streak; end_of_streak = i; } } } if (!max_streak) { dev_err(mmc_dev(host->mmc), "no tuning point found\n"); return -EIO; } return sdhci_cdns_set_tune_val(host, end_of_streak - max_streak / 2); } static void sdhci_cdns_hs400_enhanced_strobe(struct mmc_host *mmc, struct mmc_ios *ios) { struct sdhci_host *host = mmc_priv(mmc); struct sdhci_cdns_priv *priv = sdhci_cdns_priv(host); u32 mode; priv->enhanced_strobe = ios->enhanced_strobe; mode = sdhci_cdns_get_emmc_mode(priv); if (mode == SDHCI_CDNS_HRS06_MODE_MMC_HS400 && ios->enhanced_strobe) sdhci_cdns_set_emmc_mode(priv, SDHCI_CDNS_HRS06_MODE_MMC_HS400ES); if (mode == SDHCI_CDNS_HRS06_MODE_MMC_HS400ES && !ios->enhanced_strobe) sdhci_cdns_set_emmc_mode(priv, SDHCI_CDNS_HRS06_MODE_MMC_HS400); } static int sdhci_cdns_probe(struct platform_device *pdev) { struct sdhci_host *host; struct sdhci_pltfm_host *pltfm_host; struct sdhci_cdns_priv *priv; struct clk *clk; size_t priv_size; unsigned int nr_phy_params; int ret; struct device *dev = &pdev->dev; clk = devm_clk_get(dev, NULL); if (IS_ERR(clk)) return PTR_ERR(clk); ret = clk_prepare_enable(clk); if (ret) return ret; nr_phy_params = sdhci_cdns_phy_param_count(dev->of_node); priv_size = sizeof(*priv) + sizeof(priv->phy_params[0]) * nr_phy_params; host = sdhci_pltfm_init(pdev, &sdhci_cdns_pltfm_data, priv_size); if (IS_ERR(host)) { ret = PTR_ERR(host); goto disable_clk; } pltfm_host = sdhci_priv(host); pltfm_host->clk = clk; priv = sdhci_pltfm_priv(pltfm_host); priv->nr_phy_params = nr_phy_params; priv->hrs_addr = host->ioaddr; priv->enhanced_strobe = false; host->ioaddr += SDHCI_CDNS_SRS_BASE; host->mmc_host_ops.execute_tuning = sdhci_cdns_execute_tuning; host->mmc_host_ops.hs400_enhanced_strobe = sdhci_cdns_hs400_enhanced_strobe; sdhci_get_of_property(pdev); ret = mmc_of_parse(host->mmc); if (ret) goto free; sdhci_cdns_phy_param_parse(dev->of_node, priv); ret = sdhci_cdns_phy_init(priv); if (ret) goto free; ret = sdhci_add_host(host); if (ret) goto free; return 0; free: sdhci_pltfm_free(pdev); disable_clk: clk_disable_unprepare(clk); return ret; } #ifdef CONFIG_PM_SLEEP static int sdhci_cdns_resume(struct device *dev) { struct sdhci_host *host = dev_get_drvdata(dev); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_cdns_priv *priv = sdhci_pltfm_priv(pltfm_host); int ret; ret = clk_prepare_enable(pltfm_host->clk); if (ret) return ret; ret = sdhci_cdns_phy_init(priv); if (ret) goto disable_clk; ret = sdhci_resume_host(host); if (ret) goto disable_clk; return 0; disable_clk: clk_disable_unprepare(pltfm_host->clk); return ret; } #endif static const struct dev_pm_ops sdhci_cdns_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_cdns_resume) }; static const struct of_device_id sdhci_cdns_match[] = { { .compatible = "socionext,uniphier-sd4hc" }, { .compatible = "cdns,sd4hc" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, sdhci_cdns_match); static struct platform_driver sdhci_cdns_driver = { .driver = { .name = "sdhci-cdns", .pm = &sdhci_cdns_pm_ops, .of_match_table = sdhci_cdns_match, }, .probe = sdhci_cdns_probe, .remove = sdhci_pltfm_unregister, }; module_platform_driver(sdhci_cdns_driver); MODULE_AUTHOR("Masahiro Yamada <yamada.masahiro@socionext.com>"); MODULE_DESCRIPTION("Cadence SD/SDIO/eMMC Host Controller Driver"); MODULE_LICENSE("GPL");
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