/* * Exynos Specific Extensions for Synopsys DW Multimedia Card Interface driver * * Copyright (C) 2012, Samsung Electronics Co., Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/clk.h> #include <linux/mmc/host.h> #include <linux/mmc/mmc.h> #include <linux/of.h> #include <linux/of_gpio.h> #include <linux/pm_runtime.h> #include <linux/slab.h> #include "dw_mmc.h" #include "dw_mmc-pltfm.h" #include "dw_mmc-exynos.h" /* Variations in Exynos specific dw-mshc controller */ enum dw_mci_exynos_type { DW_MCI_TYPE_EXYNOS4210, DW_MCI_TYPE_EXYNOS4412, DW_MCI_TYPE_EXYNOS5250, DW_MCI_TYPE_EXYNOS5420, DW_MCI_TYPE_EXYNOS5420_SMU, DW_MCI_TYPE_EXYNOS7, DW_MCI_TYPE_EXYNOS7_SMU, }; /* Exynos implementation specific driver private data */ struct dw_mci_exynos_priv_data { enum dw_mci_exynos_type ctrl_type; u8 ciu_div; u32 sdr_timing; u32 ddr_timing; u32 hs400_timing; u32 tuned_sample; u32 cur_speed; u32 dqs_delay; u32 saved_dqs_en; u32 saved_strobe_ctrl; }; static struct dw_mci_exynos_compatible { char *compatible; enum dw_mci_exynos_type ctrl_type; } exynos_compat[] = { { .compatible = "samsung,exynos4210-dw-mshc", .ctrl_type = DW_MCI_TYPE_EXYNOS4210, }, { .compatible = "samsung,exynos4412-dw-mshc", .ctrl_type = DW_MCI_TYPE_EXYNOS4412, }, { .compatible = "samsung,exynos5250-dw-mshc", .ctrl_type = DW_MCI_TYPE_EXYNOS5250, }, { .compatible = "samsung,exynos5420-dw-mshc", .ctrl_type = DW_MCI_TYPE_EXYNOS5420, }, { .compatible = "samsung,exynos5420-dw-mshc-smu", .ctrl_type = DW_MCI_TYPE_EXYNOS5420_SMU, }, { .compatible = "samsung,exynos7-dw-mshc", .ctrl_type = DW_MCI_TYPE_EXYNOS7, }, { .compatible = "samsung,exynos7-dw-mshc-smu", .ctrl_type = DW_MCI_TYPE_EXYNOS7_SMU, }, }; static inline u8 dw_mci_exynos_get_ciu_div(struct dw_mci *host) { struct dw_mci_exynos_priv_data *priv = host->priv; if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412) return EXYNOS4412_FIXED_CIU_CLK_DIV; else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210) return EXYNOS4210_FIXED_CIU_CLK_DIV; else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL64)) + 1; else return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL)) + 1; } static void dw_mci_exynos_config_smu(struct dw_mci *host) { struct dw_mci_exynos_priv_data *priv = host->priv; /* * If Exynos is provided the Security management, * set for non-ecryption mode at this time. */ if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS5420_SMU || priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) { mci_writel(host, MPSBEGIN0, 0); mci_writel(host, MPSEND0, SDMMC_ENDING_SEC_NR_MAX); mci_writel(host, MPSCTRL0, SDMMC_MPSCTRL_SECURE_WRITE_BIT | SDMMC_MPSCTRL_NON_SECURE_READ_BIT | SDMMC_MPSCTRL_VALID | SDMMC_MPSCTRL_NON_SECURE_WRITE_BIT); } } static int dw_mci_exynos_priv_init(struct dw_mci *host) { struct dw_mci_exynos_priv_data *priv = host->priv; dw_mci_exynos_config_smu(host); if (priv->ctrl_type >= DW_MCI_TYPE_EXYNOS5420) { priv->saved_strobe_ctrl = mci_readl(host, HS400_DLINE_CTRL); priv->saved_dqs_en = mci_readl(host, HS400_DQS_EN); priv->saved_dqs_en |= AXI_NON_BLOCKING_WR; mci_writel(host, HS400_DQS_EN, priv->saved_dqs_en); if (!priv->dqs_delay) priv->dqs_delay = DQS_CTRL_GET_RD_DELAY(priv->saved_strobe_ctrl); } host->bus_hz /= (priv->ciu_div + 1); return 0; } static void dw_mci_exynos_set_clksel_timing(struct dw_mci *host, u32 timing) { struct dw_mci_exynos_priv_data *priv = host->priv; u32 clksel; if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) clksel = mci_readl(host, CLKSEL64); else clksel = mci_readl(host, CLKSEL); clksel = (clksel & ~SDMMC_CLKSEL_TIMING_MASK) | timing; if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) mci_writel(host, CLKSEL64, clksel); else mci_writel(host, CLKSEL, clksel); /* * Exynos4412 and Exynos5250 extends the use of CMD register with the * use of bit 29 (which is reserved on standard MSHC controllers) for * optionally bypassing the HOLD register for command and data. The * HOLD register should be bypassed in case there is no phase shift * applied on CMD/DATA that is sent to the card. */ if (!SDMMC_CLKSEL_GET_DRV_WD3(clksel) && host->slot) set_bit(DW_MMC_CARD_NO_USE_HOLD, &host->slot->flags); } #ifdef CONFIG_PM static int dw_mci_exynos_runtime_resume(struct device *dev) { struct dw_mci *host = dev_get_drvdata(dev); dw_mci_exynos_config_smu(host); return dw_mci_runtime_resume(dev); } /** * dw_mci_exynos_resume_noirq - Exynos-specific resume code * * On exynos5420 there is a silicon errata that will sometimes leave the * WAKEUP_INT bit in the CLKSEL register asserted. This bit is 1 to indicate * that it fired and we can clear it by writing a 1 back. Clear it to prevent * interrupts from going off constantly. * * We run this code on all exynos variants because it doesn't hurt. */ static int dw_mci_exynos_resume_noirq(struct device *dev) { struct dw_mci *host = dev_get_drvdata(dev); struct dw_mci_exynos_priv_data *priv = host->priv; u32 clksel; if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) clksel = mci_readl(host, CLKSEL64); else clksel = mci_readl(host, CLKSEL); if (clksel & SDMMC_CLKSEL_WAKEUP_INT) { if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) mci_writel(host, CLKSEL64, clksel); else mci_writel(host, CLKSEL, clksel); } return 0; } #else #define dw_mci_exynos_resume_noirq NULL #endif /* CONFIG_PM */ static void dw_mci_exynos_config_hs400(struct dw_mci *host, u32 timing) { struct dw_mci_exynos_priv_data *priv = host->priv; u32 dqs, strobe; /* * Not supported to configure register * related to HS400 */ if (priv->ctrl_type < DW_MCI_TYPE_EXYNOS5420) { if (timing == MMC_TIMING_MMC_HS400) dev_warn(host->dev, "cannot configure HS400, unsupported chipset\n"); return; } dqs = priv->saved_dqs_en; strobe = priv->saved_strobe_ctrl; if (timing == MMC_TIMING_MMC_HS400) { dqs |= DATA_STROBE_EN; strobe = DQS_CTRL_RD_DELAY(strobe, priv->dqs_delay); } else { dqs &= ~DATA_STROBE_EN; } mci_writel(host, HS400_DQS_EN, dqs); mci_writel(host, HS400_DLINE_CTRL, strobe); } static void dw_mci_exynos_adjust_clock(struct dw_mci *host, unsigned int wanted) { struct dw_mci_exynos_priv_data *priv = host->priv; unsigned long actual; u8 div; int ret; /* * Don't care if wanted clock is zero or * ciu clock is unavailable */ if (!wanted || IS_ERR(host->ciu_clk)) return; /* Guaranteed minimum frequency for cclkin */ if (wanted < EXYNOS_CCLKIN_MIN) wanted = EXYNOS_CCLKIN_MIN; if (wanted == priv->cur_speed) return; div = dw_mci_exynos_get_ciu_div(host); ret = clk_set_rate(host->ciu_clk, wanted * div); if (ret) dev_warn(host->dev, "failed to set clk-rate %u error: %d\n", wanted * div, ret); actual = clk_get_rate(host->ciu_clk); host->bus_hz = actual / div; priv->cur_speed = wanted; host->current_speed = 0; } static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios) { struct dw_mci_exynos_priv_data *priv = host->priv; unsigned int wanted = ios->clock; u32 timing = ios->timing, clksel; switch (timing) { case MMC_TIMING_MMC_HS400: /* Update tuned sample timing */ clksel = SDMMC_CLKSEL_UP_SAMPLE( priv->hs400_timing, priv->tuned_sample); wanted <<= 1; break; case MMC_TIMING_MMC_DDR52: clksel = priv->ddr_timing; /* Should be double rate for DDR mode */ if (ios->bus_width == MMC_BUS_WIDTH_8) wanted <<= 1; break; default: clksel = priv->sdr_timing; } /* Set clock timing for the requested speed mode*/ dw_mci_exynos_set_clksel_timing(host, clksel); /* Configure setting for HS400 */ dw_mci_exynos_config_hs400(host, timing); /* Configure clock rate */ dw_mci_exynos_adjust_clock(host, wanted); } static int dw_mci_exynos_parse_dt(struct dw_mci *host) { struct dw_mci_exynos_priv_data *priv; struct device_node *np = host->dev->of_node; u32 timing[2]; u32 div = 0; int idx; int ret; priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; for (idx = 0; idx < ARRAY_SIZE(exynos_compat); idx++) { if (of_device_is_compatible(np, exynos_compat[idx].compatible)) priv->ctrl_type = exynos_compat[idx].ctrl_type; } if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412) priv->ciu_div = EXYNOS4412_FIXED_CIU_CLK_DIV - 1; else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210) priv->ciu_div = EXYNOS4210_FIXED_CIU_CLK_DIV - 1; else { of_property_read_u32(np, "samsung,dw-mshc-ciu-div", &div); priv->ciu_div = div; } ret = of_property_read_u32_array(np, "samsung,dw-mshc-sdr-timing", timing, 2); if (ret) return ret; priv->sdr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div); ret = of_property_read_u32_array(np, "samsung,dw-mshc-ddr-timing", timing, 2); if (ret) return ret; priv->ddr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div); ret = of_property_read_u32_array(np, "samsung,dw-mshc-hs400-timing", timing, 2); if (!ret && of_property_read_u32(np, "samsung,read-strobe-delay", &priv->dqs_delay)) dev_dbg(host->dev, "read-strobe-delay is not found, assuming usage of default value\n"); priv->hs400_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], HS400_FIXED_CIU_CLK_DIV); host->priv = priv; return 0; } static inline u8 dw_mci_exynos_get_clksmpl(struct dw_mci *host) { struct dw_mci_exynos_priv_data *priv = host->priv; if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL64)); else return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL)); } static inline void dw_mci_exynos_set_clksmpl(struct dw_mci *host, u8 sample) { u32 clksel; struct dw_mci_exynos_priv_data *priv = host->priv; if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) clksel = mci_readl(host, CLKSEL64); else clksel = mci_readl(host, CLKSEL); clksel = SDMMC_CLKSEL_UP_SAMPLE(clksel, sample); if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) mci_writel(host, CLKSEL64, clksel); else mci_writel(host, CLKSEL, clksel); } static inline u8 dw_mci_exynos_move_next_clksmpl(struct dw_mci *host) { struct dw_mci_exynos_priv_data *priv = host->priv; u32 clksel; u8 sample; if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) clksel = mci_readl(host, CLKSEL64); else clksel = mci_readl(host, CLKSEL); sample = (clksel + 1) & 0x7; clksel = SDMMC_CLKSEL_UP_SAMPLE(clksel, sample); if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) mci_writel(host, CLKSEL64, clksel); else mci_writel(host, CLKSEL, clksel); return sample; } static s8 dw_mci_exynos_get_best_clksmpl(u8 candiates) { const u8 iter = 8; u8 __c; s8 i, loc = -1; for (i = 0; i < iter; i++) { __c = ror8(candiates, i); if ((__c & 0xc7) == 0xc7) { loc = i; goto out; } } for (i = 0; i < iter; i++) { __c = ror8(candiates, i); if ((__c & 0x83) == 0x83) { loc = i; goto out; } } out: return loc; } static int dw_mci_exynos_execute_tuning(struct dw_mci_slot *slot, u32 opcode) { struct dw_mci *host = slot->host; struct dw_mci_exynos_priv_data *priv = host->priv; struct mmc_host *mmc = slot->mmc; u8 start_smpl, smpl, candiates = 0; s8 found = -1; int ret = 0; start_smpl = dw_mci_exynos_get_clksmpl(host); do { mci_writel(host, TMOUT, ~0); smpl = dw_mci_exynos_move_next_clksmpl(host); if (!mmc_send_tuning(mmc, opcode, NULL)) candiates |= (1 << smpl); } while (start_smpl != smpl); found = dw_mci_exynos_get_best_clksmpl(candiates); if (found >= 0) { dw_mci_exynos_set_clksmpl(host, found); priv->tuned_sample = found; } else { ret = -EIO; } return ret; } static int dw_mci_exynos_prepare_hs400_tuning(struct dw_mci *host, struct mmc_ios *ios) { struct dw_mci_exynos_priv_data *priv = host->priv; dw_mci_exynos_set_clksel_timing(host, priv->hs400_timing); dw_mci_exynos_adjust_clock(host, (ios->clock) << 1); return 0; } /* Common capabilities of Exynos4/Exynos5 SoC */ static unsigned long exynos_dwmmc_caps[4] = { MMC_CAP_1_8V_DDR | MMC_CAP_8_BIT_DATA | MMC_CAP_CMD23, MMC_CAP_CMD23, MMC_CAP_CMD23, MMC_CAP_CMD23, }; static const struct dw_mci_drv_data exynos_drv_data = { .caps = exynos_dwmmc_caps, .init = dw_mci_exynos_priv_init, .set_ios = dw_mci_exynos_set_ios, .parse_dt = dw_mci_exynos_parse_dt, .execute_tuning = dw_mci_exynos_execute_tuning, .prepare_hs400_tuning = dw_mci_exynos_prepare_hs400_tuning, }; static const struct of_device_id dw_mci_exynos_match[] = { { .compatible = "samsung,exynos4412-dw-mshc", .data = &exynos_drv_data, }, { .compatible = "samsung,exynos5250-dw-mshc", .data = &exynos_drv_data, }, { .compatible = "samsung,exynos5420-dw-mshc", .data = &exynos_drv_data, }, { .compatible = "samsung,exynos5420-dw-mshc-smu", .data = &exynos_drv_data, }, { .compatible = "samsung,exynos7-dw-mshc", .data = &exynos_drv_data, }, { .compatible = "samsung,exynos7-dw-mshc-smu", .data = &exynos_drv_data, }, {}, }; MODULE_DEVICE_TABLE(of, dw_mci_exynos_match); static int dw_mci_exynos_probe(struct platform_device *pdev) { const struct dw_mci_drv_data *drv_data; const struct of_device_id *match; int ret; match = of_match_node(dw_mci_exynos_match, pdev->dev.of_node); drv_data = match->data; pm_runtime_get_noresume(&pdev->dev); pm_runtime_set_active(&pdev->dev); pm_runtime_enable(&pdev->dev); ret = dw_mci_pltfm_register(pdev, drv_data); if (ret) { pm_runtime_disable(&pdev->dev); pm_runtime_set_suspended(&pdev->dev); pm_runtime_put_noidle(&pdev->dev); return ret; } return 0; } static int dw_mci_exynos_remove(struct platform_device *pdev) { pm_runtime_disable(&pdev->dev); pm_runtime_set_suspended(&pdev->dev); pm_runtime_put_noidle(&pdev->dev); return dw_mci_pltfm_remove(pdev); } static const struct dev_pm_ops dw_mci_exynos_pmops = { SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume) SET_RUNTIME_PM_OPS(dw_mci_runtime_suspend, dw_mci_exynos_runtime_resume, NULL) .resume_noirq = dw_mci_exynos_resume_noirq, .thaw_noirq = dw_mci_exynos_resume_noirq, .restore_noirq = dw_mci_exynos_resume_noirq, }; static struct platform_driver dw_mci_exynos_pltfm_driver = { .probe = dw_mci_exynos_probe, .remove = dw_mci_exynos_remove, .driver = { .name = "dwmmc_exynos", .of_match_table = dw_mci_exynos_match, .pm = &dw_mci_exynos_pmops, }, }; module_platform_driver(dw_mci_exynos_pltfm_driver); MODULE_DESCRIPTION("Samsung Specific DW-MSHC Driver Extension"); MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:dwmmc_exynos");