X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fmmc%2Fhost%2Fdw_mmc-exynos.c;fp=kernel%2Fdrivers%2Fmmc%2Fhost%2Fdw_mmc-exynos.c;h=e761eb1b1441339e33a84822ff863b20165e97cf;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/mmc/host/dw_mmc-exynos.c b/kernel/drivers/mmc/host/dw_mmc-exynos.c new file mode 100644 index 000000000..e761eb1b1 --- /dev/null +++ b/kernel/drivers/mmc/host/dw_mmc-exynos.c @@ -0,0 +1,559 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include +#include + +#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 int dw_mci_exynos_priv_init(struct dw_mci *host) +{ + struct dw_mci_exynos_priv_data *priv = host->priv; + + 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); + } + + 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); + } + + return 0; +} + +static int dw_mci_exynos_setup_clock(struct dw_mci *host) +{ + struct dw_mci_exynos_priv_data *priv = host->priv; + + 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); +} + +#ifdef CONFIG_PM_SLEEP +static int dw_mci_exynos_suspend(struct device *dev) +{ + struct dw_mci *host = dev_get_drvdata(dev); + + return dw_mci_suspend(host); +} + +static int dw_mci_exynos_resume(struct device *dev) +{ + struct dw_mci *host = dev_get_drvdata(dev); + + dw_mci_exynos_priv_init(host); + return dw_mci_resume(host); +} + +/** + * 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_suspend NULL +#define dw_mci_exynos_resume NULL +#define dw_mci_exynos_resume_noirq NULL +#endif /* CONFIG_PM_SLEEP */ + +static void dw_mci_exynos_prepare_command(struct dw_mci *host, u32 *cmdr) +{ + struct dw_mci_exynos_priv_data *priv = host->priv; + /* + * 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 (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || + priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) { + if (SDMMC_CLKSEL_GET_DRV_WD3(mci_readl(host, CLKSEL64))) + *cmdr |= SDMMC_CMD_USE_HOLD_REG; + } else { + if (SDMMC_CLKSEL_GET_DRV_WD3(mci_readl(host, CLKSEL))) + *cmdr |= SDMMC_CMD_USE_HOLD_REG; + } +} + +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) + 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) +{ + 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)) + 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, + .setup_clock = dw_mci_exynos_setup_clock, + .prepare_command = dw_mci_exynos_prepare_command, + .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; + + match = of_match_node(dw_mci_exynos_match, pdev->dev.of_node); + drv_data = match->data; + return dw_mci_pltfm_register(pdev, drv_data); +} + +static const struct dev_pm_ops dw_mci_exynos_pmops = { + SET_SYSTEM_SLEEP_PM_OPS(dw_mci_exynos_suspend, dw_mci_exynos_resume) + .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_pltfm_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