@@ -82,4 +82,4 @@ ifeq ($(CONFIG_CB710_DEBUG),y)
endif
obj-$(CONFIG_MMC_SDHCI_XENON) += sdhci-xenon-driver.o
-sdhci-xenon-driver-y += sdhci-xenon.o
+sdhci-xenon-driver-y += sdhci-xenon.o sdhci-xenon-phy.o
new file mode 100644
@@ -0,0 +1,799 @@
+/*
+ * PHY support for Xenon SDHC
+ *
+ * Copyright (C) 2016 Marvell, All Rights Reserved.
+ *
+ * Author: Hu Ziji <huziji@marvell.com>
+ * Date: 2016-8-24
+ *
+ * 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 version 2.
+ */
+
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/of_address.h>
+
+#include "sdhci-pltfm.h"
+#include "sdhci-xenon.h"
+
+/* Register base for eMMC PHY 5.0 Version */
+#define SDHCI_EMMC_5_0_PHY_REG_BASE 0x0160
+/* Register base for eMMC PHY 5.1 Version */
+#define SDHCI_EMMC_PHY_REG_BASE 0x0170
+
+#define SDHCI_EMMC_PHY_TIMING_ADJUST SDHCI_EMMC_PHY_REG_BASE
+#define SDHCI_EMMC_5_0_PHY_TIMING_ADJUST SDHCI_EMMC_5_0_PHY_REG_BASE
+#define SDHCI_TIMING_ADJUST_SLOW_MODE BIT(29)
+#define SDHCI_TIMING_ADJUST_SDIO_MODE BIT(28)
+#define SDHCI_OUTPUT_QSN_PHASE_SELECT BIT(17)
+#define SDHCI_SAMPL_INV_QSP_PHASE_SELECT BIT(18)
+#define SDHCI_SAMPL_INV_QSP_PHASE_SELECT_SHIFT 18
+#define SDHCI_PHY_INITIALIZAION BIT(31)
+#define SDHCI_WAIT_CYCLE_BEFORE_USING_MASK 0xF
+#define SDHCI_WAIT_CYCLE_BEFORE_USING_SHIFT 12
+#define SDHCI_FC_SYNC_EN_DURATION_MASK 0xF
+#define SDHCI_FC_SYNC_EN_DURATION_SHIFT 8
+#define SDHCI_FC_SYNC_RST_EN_DURATION_MASK 0xF
+#define SDHCI_FC_SYNC_RST_EN_DURATION_SHIFT 4
+#define SDHCI_FC_SYNC_RST_DURATION_MASK 0xF
+#define SDHCI_FC_SYNC_RST_DURATION_SHIFT 0
+
+#define SDHCI_EMMC_PHY_FUNC_CONTROL (SDHCI_EMMC_PHY_REG_BASE + 0x4)
+#define SDHCI_EMMC_5_0_PHY_FUNC_CONTROL \
+ (SDHCI_EMMC_5_0_PHY_REG_BASE + 0x4)
+#define SDHCI_ASYNC_DDRMODE_MASK BIT(23)
+#define SDHCI_ASYNC_DDRMODE_SHIFT 23
+#define SDHCI_CMD_DDR_MODE BIT(16)
+#define SDHCI_DQ_DDR_MODE_SHIFT 8
+#define SDHCI_DQ_DDR_MODE_MASK 0xFF
+#define SDHCI_DQ_ASYNC_MODE BIT(4)
+
+#define SDHCI_EMMC_PHY_PAD_CONTROL (SDHCI_EMMC_PHY_REG_BASE + 0x8)
+#define SDHCI_EMMC_5_0_PHY_PAD_CONTROL \
+ (SDHCI_EMMC_5_0_PHY_REG_BASE + 0x8)
+#define SDHCI_REC_EN_SHIFT 24
+#define SDHCI_REC_EN_MASK 0xF
+#define SDHCI_FC_DQ_RECEN BIT(24)
+#define SDHCI_FC_CMD_RECEN BIT(25)
+#define SDHCI_FC_QSP_RECEN BIT(26)
+#define SDHCI_FC_QSN_RECEN BIT(27)
+#define SDHCI_OEN_QSN BIT(28)
+#define SDHCI_AUTO_RECEN_CTRL BIT(30)
+#define SDHCI_FC_ALL_CMOS_RECEIVER 0xF000
+
+#define SDHCI_EMMC5_FC_QSP_PD BIT(18)
+#define SDHCI_EMMC5_FC_QSP_PU BIT(22)
+#define SDHCI_EMMC5_FC_CMD_PD BIT(17)
+#define SDHCI_EMMC5_FC_CMD_PU BIT(21)
+#define SDHCI_EMMC5_FC_DQ_PD BIT(16)
+#define SDHCI_EMMC5_FC_DQ_PU BIT(20)
+
+#define SDHCI_EMMC_PHY_PAD_CONTROL1 (SDHCI_EMMC_PHY_REG_BASE + 0xC)
+#define SDHCI_EMMC5_1_FC_QSP_PD BIT(9)
+#define SDHCI_EMMC5_1_FC_QSP_PU BIT(25)
+#define SDHCI_EMMC5_1_FC_CMD_PD BIT(8)
+#define SDHCI_EMMC5_1_FC_CMD_PU BIT(24)
+#define SDHCI_EMMC5_1_FC_DQ_PD 0xFF
+#define SDHCI_EMMC5_1_FC_DQ_PU (0xFF << 16)
+
+#define SDHCI_EMMC_PHY_PAD_CONTROL2 (SDHCI_EMMC_PHY_REG_BASE + 0x10)
+#define SDHCI_EMMC_5_0_PHY_PAD_CONTROL2 \
+ (SDHCI_EMMC_5_0_PHY_REG_BASE + 0xC)
+#define SDHCI_ZNR_MASK 0x1F
+#define SDHCI_ZNR_SHIFT 8
+#define SDHCI_ZPR_MASK 0x1F
+/* Perferred ZNR and ZPR value vary between different boards.
+ * The specific ZNR and ZPR value should be defined here
+ * according to board actual timing.
+ */
+#define SDHCI_ZNR_DEF_VALUE 0xF
+#define SDHCI_ZPR_DEF_VALUE 0xF
+
+#define SDHCI_EMMC_PHY_DLL_CONTROL (SDHCI_EMMC_PHY_REG_BASE + 0x14)
+#define SDHCI_EMMC_5_0_PHY_DLL_CONTROL \
+ (SDHCI_EMMC_5_0_PHY_REG_BASE + 0x10)
+#define SDHCI_DLL_ENABLE BIT(31)
+#define SDHCI_DLL_UPDATE_STROBE_5_0 BIT(30)
+#define SDHCI_DLL_REFCLK_SEL BIT(30)
+#define SDHCI_DLL_UPDATE BIT(23)
+#define SDHCI_DLL_PHSEL1_SHIFT 24
+#define SDHCI_DLL_PHSEL0_SHIFT 16
+#define SDHCI_DLL_PHASE_MASK 0x3F
+#define SDHCI_DLL_PHASE_90_DEGREE 0x1F
+#define SDHCI_DLL_FAST_LOCK BIT(5)
+#define SDHCI_DLL_GAIN2X BIT(3)
+#define SDHCI_DLL_BYPASS_EN BIT(0)
+
+#define SDHCI_EMMC_5_0_PHY_LOGIC_TIMING_ADJUST \
+ (SDHCI_EMMC_5_0_PHY_REG_BASE + 0x14)
+#define SDHCI_EMMC_PHY_LOGIC_TIMING_ADJUST (SDHCI_EMMC_PHY_REG_BASE + 0x18)
+#define SDHCI_LOGIC_TIMING_VALUE 0x00AA8977
+
+enum soc_pad_ctrl_type {
+ SOC_PAD_SD,
+ SOC_PAD_FIXED_1_8V,
+};
+
+/*
+ * List offset of PHY registers and some special register values
+ * in eMMC PHY 5.0 or eMMC PHY 5.1
+ */
+struct xenon_emmc_phy_regs {
+ /* Offset of Timing Adjust register */
+ u16 timing_adj;
+ /* Offset of Func Control register */
+ u16 func_ctrl;
+ /* Offset of Pad Control register */
+ u16 pad_ctrl;
+ /* Offset of Pad Control register 2 */
+ u16 pad_ctrl2;
+ /* Offset of DLL Control register */
+ u16 dll_ctrl;
+ /* Offset of Logic Timing Adjust register */
+ u16 logic_timing_adj;
+ /* DLL Update Enable bit */
+ u32 dll_update;
+};
+
+static const char * const phy_types[] = {
+ "emmc 5.0 phy",
+ "emmc 5.1 phy"
+};
+
+enum phy_type_enum {
+ EMMC_5_0_PHY,
+ EMMC_5_1_PHY,
+ NR_PHY_TYPES
+};
+
+static struct xenon_emmc_phy_regs xenon_emmc_5_0_phy_regs = {
+ .timing_adj = SDHCI_EMMC_5_0_PHY_TIMING_ADJUST,
+ .func_ctrl = SDHCI_EMMC_5_0_PHY_FUNC_CONTROL,
+ .pad_ctrl = SDHCI_EMMC_5_0_PHY_PAD_CONTROL,
+ .pad_ctrl2 = SDHCI_EMMC_5_0_PHY_PAD_CONTROL2,
+ .dll_ctrl = SDHCI_EMMC_5_0_PHY_DLL_CONTROL,
+ .logic_timing_adj = SDHCI_EMMC_5_0_PHY_LOGIC_TIMING_ADJUST,
+ .dll_update = SDHCI_DLL_UPDATE_STROBE_5_0,
+};
+
+static struct xenon_emmc_phy_regs xenon_emmc_5_1_phy_regs = {
+ .timing_adj = SDHCI_EMMC_PHY_TIMING_ADJUST,
+ .func_ctrl = SDHCI_EMMC_PHY_FUNC_CONTROL,
+ .pad_ctrl = SDHCI_EMMC_PHY_PAD_CONTROL,
+ .pad_ctrl2 = SDHCI_EMMC_PHY_PAD_CONTROL2,
+ .dll_ctrl = SDHCI_EMMC_PHY_DLL_CONTROL,
+ .logic_timing_adj = SDHCI_EMMC_PHY_LOGIC_TIMING_ADJUST,
+ .dll_update = SDHCI_DLL_UPDATE,
+};
+
+/*
+ * eMMC PHY configuration and operations
+ */
+struct emmc_phy_params {
+ bool slow_mode;
+
+ u8 znr;
+ u8 zpr;
+
+ /* Nr of consecutive Sampling Points of a Valid Sampling Window */
+ u8 nr_tun_times;
+ /* Divider for calculating Tuning Step */
+ u8 tun_step_divider;
+};
+
+static int alloc_emmc_phy(struct sdhci_xenon_priv *priv)
+{
+ struct emmc_phy_params *params;
+
+ params = kzalloc(sizeof(*params), GFP_KERNEL);
+ if (!params)
+ return -ENOMEM;
+
+ priv->phy_params = params;
+ if (priv->phy_type == EMMC_5_0_PHY)
+ priv->emmc_phy_regs = &xenon_emmc_5_0_phy_regs;
+ else
+ priv->emmc_phy_regs = &xenon_emmc_5_1_phy_regs;
+
+ return 0;
+}
+
+/*
+ * eMMC 5.0/5.1 PHY init/re-init.
+ * eMMC PHY init should be executed after:
+ * 1. SDCLK frequecny changes.
+ * 2. SDCLK is stopped and re-enabled.
+ * 3. config in emmc_phy_regs->timing_adj and emmc_phy_regs->func_ctrl
+ * are changed
+ */
+static int emmc_phy_init(struct sdhci_host *host)
+{
+ u32 reg;
+ u32 wait, clock;
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
+ struct xenon_emmc_phy_regs *phy_regs = priv->emmc_phy_regs;
+
+ reg = sdhci_readl(host, phy_regs->timing_adj);
+ reg |= SDHCI_PHY_INITIALIZAION;
+ sdhci_writel(host, reg, phy_regs->timing_adj);
+
+ /* Add duration of FC_SYNC_RST */
+ wait = ((reg >> SDHCI_FC_SYNC_RST_DURATION_SHIFT) &
+ SDHCI_FC_SYNC_RST_DURATION_MASK);
+ /* Add interval between FC_SYNC_EN and FC_SYNC_RST */
+ wait += ((reg >> SDHCI_FC_SYNC_RST_EN_DURATION_SHIFT) &
+ SDHCI_FC_SYNC_RST_EN_DURATION_MASK);
+ /* Add duration of asserting FC_SYNC_EN */
+ wait += ((reg >> SDHCI_FC_SYNC_EN_DURATION_SHIFT) &
+ SDHCI_FC_SYNC_EN_DURATION_MASK);
+ /* Add duration of waiting for PHY */
+ wait += ((reg >> SDHCI_WAIT_CYCLE_BEFORE_USING_SHIFT) &
+ SDHCI_WAIT_CYCLE_BEFORE_USING_MASK);
+ /* 4 addtional bus clock and 4 AXI bus clock are required */
+ wait += 8;
+ wait <<= 20;
+
+ clock = host->clock;
+ if (!clock)
+ /* Use the possibly slowest bus frequency value */
+ clock = SDHCI_LOWEST_SDCLK_FREQ;
+ /* get the wait time */
+ wait /= clock;
+ wait++;
+ /* wait for host eMMC PHY init completes */
+ udelay(wait);
+
+ reg = sdhci_readl(host, phy_regs->timing_adj);
+ reg &= SDHCI_PHY_INITIALIZAION;
+ if (reg) {
+ dev_err(mmc_dev(host->mmc), "eMMC PHY init cannot complete after %d us\n",
+ wait);
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+/*
+ * Enable eMMC PHY HW DLL
+ * DLL should be enabled and stable before HS200/SDR104 tuning,
+ * and before HS400 data strobe setting.
+ */
+static int emmc_phy_enable_dll(struct sdhci_host *host)
+{
+ u32 reg;
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
+ struct xenon_emmc_phy_regs *phy_regs = priv->emmc_phy_regs;
+ u8 timeout;
+
+ if (WARN_ON(host->clock <= MMC_HIGH_52_MAX_DTR))
+ return -EINVAL;
+
+ reg = sdhci_readl(host, phy_regs->dll_ctrl);
+ if (reg & SDHCI_DLL_ENABLE)
+ return 0;
+
+ /* Enable DLL */
+ reg = sdhci_readl(host, phy_regs->dll_ctrl);
+ reg |= (SDHCI_DLL_ENABLE | SDHCI_DLL_FAST_LOCK);
+
+ /*
+ * Set Phase as 90 degree, which is most common value.
+ * Might set another value if necessary.
+ * The granularity is 1 degree.
+ */
+ reg &= ~((SDHCI_DLL_PHASE_MASK << SDHCI_DLL_PHSEL0_SHIFT) |
+ (SDHCI_DLL_PHASE_MASK << SDHCI_DLL_PHSEL1_SHIFT));
+ reg |= ((SDHCI_DLL_PHASE_90_DEGREE << SDHCI_DLL_PHSEL0_SHIFT) |
+ (SDHCI_DLL_PHASE_90_DEGREE << SDHCI_DLL_PHSEL1_SHIFT));
+
+ reg &= ~SDHCI_DLL_BYPASS_EN;
+ reg |= phy_regs->dll_update;
+ if (priv->phy_type == EMMC_5_1_PHY)
+ reg &= ~SDHCI_DLL_REFCLK_SEL;
+ sdhci_writel(host, reg, phy_regs->dll_ctrl);
+
+ /* Wait max 32 ms */
+ timeout = 32;
+ while (!(sdhci_readw(host, SDHCI_SLOT_EXT_PRESENT_STATE) &
+ SDHCI_DLL_LOCK_STATE)) {
+ if (!timeout) {
+ dev_err(mmc_dev(host->mmc), "Wait for DLL Lock time-out\n");
+ return -ETIMEDOUT;
+ }
+ timeout--;
+ mdelay(1);
+ }
+ return 0;
+}
+
+/*
+ * Config to eMMC PHY to prepare for tuning.
+ * Enable HW DLL and set the TUNING_STEP
+ */
+static int emmc_phy_config_tuning(struct sdhci_host *host)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
+ struct emmc_phy_params *params = priv->phy_params;
+ u32 reg, tuning_step;
+ int ret;
+ unsigned long flags;
+
+ if (WARN_ON(host->clock <= MMC_HIGH_52_MAX_DTR))
+ return -EINVAL;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ ret = emmc_phy_enable_dll(host);
+ if (ret) {
+ spin_unlock_irqrestore(&host->lock, flags);
+ return ret;
+ }
+
+ /* Achieve TUNGING_STEP with HW DLL help */
+ reg = sdhci_readl(host, SDHCI_SLOT_DLL_CUR_DLY_VAL);
+ tuning_step = reg / params->tun_step_divider;
+ if (unlikely(tuning_step > SDHCI_TUNING_STEP_MASK)) {
+ dev_warn(mmc_dev(host->mmc),
+ "HS200 TUNING_STEP %d is larger than MAX value\n",
+ tuning_step);
+ tuning_step = SDHCI_TUNING_STEP_MASK;
+ }
+
+ /* Set TUNING_STEP for later tuning */
+ reg = sdhci_readl(host, SDHCI_SLOT_OP_STATUS_CTRL);
+ reg &= ~(SDHCI_TUN_CONSECUTIVE_TIMES_MASK <<
+ SDHCI_TUN_CONSECUTIVE_TIMES_SHIFT);
+ reg |= (params->nr_tun_times << SDHCI_TUN_CONSECUTIVE_TIMES_SHIFT);
+ reg &= ~(SDHCI_TUNING_STEP_MASK << SDHCI_TUNING_STEP_SHIFT);
+ reg |= (tuning_step << SDHCI_TUNING_STEP_SHIFT);
+ sdhci_writel(host, reg, SDHCI_SLOT_OP_STATUS_CTRL);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+ return 0;
+}
+
+static void __emmc_phy_disable_data_strobe(struct sdhci_host *host)
+{
+ u32 reg;
+
+ /* Disable SDHC Data Strobe */
+ reg = sdhci_readl(host, SDHCI_SLOT_EMMC_CTRL);
+ reg &= ~SDHCI_ENABLE_DATA_STROBE;
+ sdhci_writel(host, reg, SDHCI_SLOT_EMMC_CTRL);
+}
+
+/* Set HS400 Data Strobe */
+static void emmc_phy_strobe_delay_adj(struct sdhci_host *host)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
+ unsigned long flags;
+ u32 reg;
+
+ if (WARN_ON(host->timing != MMC_TIMING_MMC_HS400))
+ return;
+
+ if (host->clock <= MMC_HIGH_52_MAX_DTR)
+ return;
+
+ dev_dbg(mmc_dev(host->mmc), "starts HS400 strobe delay adjustment\n");
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ emmc_phy_enable_dll(host);
+
+ /* Enable SDHC Data Strobe */
+ reg = sdhci_readl(host, SDHCI_SLOT_EMMC_CTRL);
+ reg |= SDHCI_ENABLE_DATA_STROBE;
+ sdhci_writel(host, reg, SDHCI_SLOT_EMMC_CTRL);
+
+ /* Set Data Strobe Pull down */
+ if (priv->phy_type == EMMC_5_0_PHY) {
+ reg = sdhci_readl(host, SDHCI_EMMC_5_0_PHY_PAD_CONTROL);
+ reg |= SDHCI_EMMC5_FC_QSP_PD;
+ reg &= ~SDHCI_EMMC5_FC_QSP_PU;
+ sdhci_writel(host, reg, SDHCI_EMMC_5_0_PHY_PAD_CONTROL);
+ } else {
+ reg = sdhci_readl(host, SDHCI_EMMC_PHY_PAD_CONTROL1);
+ reg |= SDHCI_EMMC5_1_FC_QSP_PD;
+ reg &= ~SDHCI_EMMC5_1_FC_QSP_PU;
+ sdhci_writel(host, reg, SDHCI_EMMC_PHY_PAD_CONTROL1);
+ }
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static inline bool temp_stage_hs200_to_hs400(struct sdhci_host *host,
+ struct sdhci_xenon_priv *priv)
+{
+ /*
+ * Tmep stages from HS200 to HS400
+ * from HS200 to HS in 200MHz
+ * from 200MHz to 52MHz
+ */
+ if (((priv->timing == MMC_TIMING_MMC_HS200) &&
+ (host->timing == MMC_TIMING_MMC_HS)) ||
+ ((host->timing == MMC_TIMING_MMC_HS) &&
+ (priv->clock > host->clock)))
+ return true;
+
+ return false;
+}
+
+static inline bool temp_stage_hs400_to_h200(struct sdhci_host *host,
+ struct sdhci_xenon_priv *priv)
+{
+ /*
+ * Temp stages from HS400 t0 HS200:
+ * from 200MHz to 52MHz in HS400
+ * from HS400 to HS DDR in 52MHz
+ * from HS DDR to HS in 52MHz
+ * from HS to HS200 in 52MHz
+ */
+ if (((priv->timing == MMC_TIMING_MMC_HS400) &&
+ ((host->clock == MMC_HIGH_52_MAX_DTR) ||
+ (host->timing == MMC_TIMING_MMC_DDR52))) ||
+ ((priv->timing == MMC_TIMING_MMC_DDR52) &&
+ (host->timing == MMC_TIMING_MMC_HS)) ||
+ ((host->timing == MMC_TIMING_MMC_HS200) &&
+ (host->clock == MMC_HIGH_52_MAX_DTR)))
+ return true;
+
+ return false;
+}
+
+/*
+ * If eMMC PHY Slow Mode is required in lower speed mode in SDR mode
+ * (SDLCK < 55MHz), enable Slow Mode to bypass eMMC PHY.
+ * SDIO slower SDR mode also requires Slow Mode.
+ *
+ * If Slow Mode is enabled, return true.
+ * Otherwise, return false.
+ */
+static bool emmc_phy_slow_mode(struct sdhci_host *host,
+ unsigned char timing)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
+ struct emmc_phy_params *params = priv->phy_params;
+ struct xenon_emmc_phy_regs *phy_regs = priv->emmc_phy_regs;
+ u32 reg;
+
+ /* Skip temp stages from HS200 to HS400 */
+ if (temp_stage_hs200_to_hs400(host, priv))
+ return 0;
+
+ /* Skip temp stages from HS400 t0 HS200 */
+ if (temp_stage_hs400_to_h200(host, priv))
+ return 0;
+
+ reg = sdhci_readl(host, phy_regs->timing_adj);
+ /* Enable Slow Mode for SDIO in slower SDR mode */
+ if ((priv->init_card_type == MMC_TYPE_SDIO) &&
+ ((timing == MMC_TIMING_UHS_SDR25) ||
+ (timing == MMC_TIMING_UHS_SDR12) ||
+ (timing == MMC_TIMING_SD_HS) ||
+ (timing == MMC_TIMING_LEGACY))) {
+ reg |= SDHCI_TIMING_ADJUST_SLOW_MODE;
+ sdhci_writel(host, reg, phy_regs->timing_adj);
+ return true;
+ }
+
+ /* Check if Slow Mode is required in lower speed mode in SDR mode */
+ if (((timing == MMC_TIMING_UHS_SDR50) ||
+ (timing == MMC_TIMING_UHS_SDR25) ||
+ (timing == MMC_TIMING_UHS_SDR12) ||
+ (timing == MMC_TIMING_SD_HS) ||
+ (timing == MMC_TIMING_MMC_HS) ||
+ (timing == MMC_TIMING_LEGACY)) && params->slow_mode) {
+ reg |= SDHCI_TIMING_ADJUST_SLOW_MODE;
+ sdhci_writel(host, reg, phy_regs->timing_adj);
+ return true;
+ }
+
+ reg &= ~SDHCI_TIMING_ADJUST_SLOW_MODE;
+ sdhci_writel(host, reg, phy_regs->timing_adj);
+ return false;
+}
+
+/*
+ * Set-up eMMC 5.0/5.1 PHY.
+ * Specific onfiguration depends on the current speed mode in use.
+ */
+static void emmc_phy_set(struct sdhci_host *host,
+ unsigned char timing)
+{
+ u32 reg;
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
+ struct emmc_phy_params *params = priv->phy_params;
+ struct xenon_emmc_phy_regs *phy_regs = priv->emmc_phy_regs;
+ unsigned long flags;
+
+ dev_dbg(mmc_dev(host->mmc), "eMMC PHY setting starts\n");
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ reg = sdhci_readl(host, SDHCI_SYS_EXT_OP_CTRL);
+ reg |= SDHCI_MASK_CMD_CONFLICT_ERROR;
+ sdhci_writel(host, reg, SDHCI_SYS_EXT_OP_CTRL);
+
+ /* Setup pad, set bit[28] and bits[26:24] */
+ reg = sdhci_readl(host, phy_regs->pad_ctrl);
+ reg |= (SDHCI_FC_DQ_RECEN | SDHCI_FC_CMD_RECEN |
+ SDHCI_FC_QSP_RECEN | SDHCI_OEN_QSN);
+ /* All FC_XX_RECEIVCE should be set as CMOS Type */
+ reg |= SDHCI_FC_ALL_CMOS_RECEIVER;
+ sdhci_writel(host, reg, phy_regs->pad_ctrl);
+
+ /* Set CMD and DQ Pull Up */
+ if (priv->phy_type == EMMC_5_0_PHY) {
+ reg = sdhci_readl(host, SDHCI_EMMC_5_0_PHY_PAD_CONTROL);
+ reg |= (SDHCI_EMMC5_FC_CMD_PU | SDHCI_EMMC5_FC_DQ_PU);
+ reg &= ~(SDHCI_EMMC5_FC_CMD_PD | SDHCI_EMMC5_FC_DQ_PD);
+ sdhci_writel(host, reg, SDHCI_EMMC_5_0_PHY_PAD_CONTROL);
+ } else {
+ reg = sdhci_readl(host, SDHCI_EMMC_PHY_PAD_CONTROL1);
+ reg |= (SDHCI_EMMC5_1_FC_CMD_PU | SDHCI_EMMC5_1_FC_DQ_PU);
+ reg &= ~(SDHCI_EMMC5_1_FC_CMD_PD | SDHCI_EMMC5_1_FC_DQ_PD);
+ sdhci_writel(host, reg, SDHCI_EMMC_PHY_PAD_CONTROL1);
+ }
+
+ if (timing == MMC_TIMING_LEGACY)
+ goto phy_init;
+
+ /*
+ * FIXME: should depends on the specific board timing.
+ */
+ if ((timing == MMC_TIMING_MMC_HS400) ||
+ (timing == MMC_TIMING_MMC_HS200) ||
+ (timing == MMC_TIMING_UHS_SDR50) ||
+ (timing == MMC_TIMING_UHS_SDR104) ||
+ (timing == MMC_TIMING_UHS_DDR50) ||
+ (timing == MMC_TIMING_UHS_SDR25) ||
+ (timing == MMC_TIMING_MMC_DDR52)) {
+ reg = sdhci_readl(host, phy_regs->timing_adj);
+ reg &= ~SDHCI_OUTPUT_QSN_PHASE_SELECT;
+ sdhci_writel(host, reg, phy_regs->timing_adj);
+ }
+
+ /*
+ * If SDIO card, set SDIO Mode
+ * Otherwise, clear SDIO Mode
+ */
+ reg = sdhci_readl(host, phy_regs->timing_adj);
+ if (priv->init_card_type == MMC_TYPE_SDIO)
+ reg |= SDHCI_TIMING_ADJUST_SDIO_MODE;
+ else
+ reg &= ~SDHCI_TIMING_ADJUST_SDIO_MODE;
+ sdhci_writel(host, reg, phy_regs->timing_adj);
+
+ if (emmc_phy_slow_mode(host, timing))
+ goto phy_init;
+
+ /*
+ * Set preferred ZNR and ZPR value
+ * The ZNR and ZPR value vary between different boards.
+ * Define them both in sdhci-xenon-emmc-phy.h.
+ */
+ reg = sdhci_readl(host, phy_regs->pad_ctrl2);
+ reg &= ~((SDHCI_ZNR_MASK << SDHCI_ZNR_SHIFT) | SDHCI_ZPR_MASK);
+ reg |= ((params->znr << SDHCI_ZNR_SHIFT) | params->zpr);
+ sdhci_writel(host, reg, phy_regs->pad_ctrl2);
+
+ /*
+ * When setting EMMC_PHY_FUNC_CONTROL register,
+ * SD clock should be disabled
+ */
+ reg = sdhci_readl(host, SDHCI_CLOCK_CONTROL);
+ reg &= ~SDHCI_CLOCK_CARD_EN;
+ sdhci_writew(host, reg, SDHCI_CLOCK_CONTROL);
+
+ reg = sdhci_readl(host, phy_regs->func_ctrl);
+ if ((timing == MMC_TIMING_UHS_DDR50) ||
+ (timing == MMC_TIMING_MMC_HS400) ||
+ (timing == MMC_TIMING_MMC_DDR52))
+ reg |= (SDHCI_DQ_DDR_MODE_MASK << SDHCI_DQ_DDR_MODE_SHIFT) |
+ SDHCI_CMD_DDR_MODE;
+ else
+ reg &= ~((SDHCI_DQ_DDR_MODE_MASK << SDHCI_DQ_DDR_MODE_SHIFT) |
+ SDHCI_CMD_DDR_MODE);
+
+ if (timing == MMC_TIMING_MMC_HS400)
+ reg &= ~SDHCI_DQ_ASYNC_MODE;
+ else
+ reg |= SDHCI_DQ_ASYNC_MODE;
+ sdhci_writel(host, reg, phy_regs->func_ctrl);
+
+ /* Enable bus clock */
+ reg = sdhci_readl(host, SDHCI_CLOCK_CONTROL);
+ reg |= SDHCI_CLOCK_CARD_EN;
+ sdhci_writew(host, reg, SDHCI_CLOCK_CONTROL);
+
+ if (timing == MMC_TIMING_MMC_HS400)
+ /* Hardware team recommend a value for HS400 */
+ sdhci_writel(host, SDHCI_LOGIC_TIMING_VALUE,
+ phy_regs->logic_timing_adj);
+ else
+ __emmc_phy_disable_data_strobe(host);
+
+phy_init:
+ emmc_phy_init(host);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ dev_dbg(mmc_dev(host->mmc), "eMMC PHY setting completes\n");
+}
+
+static int emmc_phy_parse_param_dt(struct sdhci_host *host,
+ struct device_node *np,
+ struct emmc_phy_params *params)
+{
+ u32 value;
+
+ if (of_property_read_bool(np, "marvell,xenon-phy-slow-mode"))
+ params->slow_mode = true;
+ else
+ params->slow_mode = false;
+
+ if (!of_property_read_u32(np, "marvell,xenon-phy-znr", &value))
+ params->znr = value & SDHCI_ZNR_MASK;
+ else
+ params->znr = SDHCI_ZNR_DEF_VALUE;
+
+ if (!of_property_read_u32(np, "marvell,xenon-phy-zpr", &value))
+ params->zpr = value & SDHCI_ZPR_MASK;
+ else
+ params->zpr = SDHCI_ZPR_DEF_VALUE;
+
+ if (!of_property_read_u32(np, "marvell,xenon-phy-nr-success-tun",
+ &value))
+ params->nr_tun_times = value & SDHCI_TUN_CONSECUTIVE_TIMES_MASK;
+ else
+ params->nr_tun_times = SDHCI_TUN_CONSECUTIVE_TIMES;
+
+ if (!of_property_read_u32(np, "marvell,xenon-phy-tun-step-divider",
+ &value))
+ params->tun_step_divider = value & 0xFF;
+ else
+ params->tun_step_divider = SDHCI_TUNING_STEP_DIVIDER;
+
+ return 0;
+}
+
+/*
+ * Setting PHY when card is working in High Speed Mode.
+ * HS400 set data strobe line.
+ * HS200/SDR104 set tuning config to prepare for tuning.
+ */
+static int xenon_hs_delay_adj(struct sdhci_host *host)
+{
+ int ret = 0;
+
+ if (WARN_ON(host->clock <= SDHCI_DEFAULT_SDCLK_FREQ))
+ return -EINVAL;
+
+ if (host->timing == MMC_TIMING_MMC_HS400) {
+ emmc_phy_strobe_delay_adj(host);
+ return 0;
+ }
+
+ if ((host->timing == MMC_TIMING_MMC_HS200) ||
+ (host->timing == MMC_TIMING_UHS_SDR104)) {
+ ret = emmc_phy_config_tuning(host);
+ if (!ret)
+ return 0;
+ }
+
+ /*
+ * DDR Mode requires driver to scan Sampling Fixed Delay Line,
+ * to find out a perfect operation sampling point.
+ * It is hard to implement such a scan in host driver since initiating
+ * commands by host driver is not safe.
+ * Thus so far just keep PHY Sampling Fixed Delay in default value
+ * in DDR mode.
+ *
+ * If any timing issue occrus in DDR mode on Marvell products,
+ * please contact maintainer to ask for internal support in Marvell.
+ */
+ if ((host->timing == MMC_TIMING_MMC_DDR52) ||
+ (host->timing == MMC_TIMING_UHS_DDR50))
+ dev_warn(mmc_dev(host->mmc), "Timing issue might occur in DDR mode\n");
+ return ret;
+}
+
+/*
+ * Adjust PHY setting.
+ * PHY setting should be adjusted when SDCLK frequency, Bus Width
+ * or Speed Mode is changed.
+ * Addtional config are required when card is working in High Speed mode,
+ * after leaving Legacy Mode.
+ */
+int xenon_phy_adj(struct sdhci_host *host, struct mmc_ios *ios)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
+ int ret = 0;
+
+ if (!host->clock) {
+ priv->clock = 0;
+ return 0;
+ }
+
+ /*
+ * The timing, frequency or bus width is changed,
+ * better to set eMMC PHY based on current setting
+ * and adjust Xenon SDHC delay.
+ */
+ if ((host->clock == priv->clock) &&
+ (ios->bus_width == priv->bus_width) &&
+ (ios->timing == priv->timing))
+ return 0;
+
+ emmc_phy_set(host, ios->timing);
+
+ /* Update the record */
+ priv->bus_width = ios->bus_width;
+
+ /* Skip temp stages from HS200 to HS400 */
+ if (temp_stage_hs200_to_hs400(host, priv))
+ return 0;
+
+ /* Skip temp stages from HS400 t0 HS200 */
+ if (temp_stage_hs400_to_h200(host, priv))
+ return 0;
+
+ priv->timing = ios->timing;
+ priv->clock = host->clock;
+
+ /* Legacy mode is a special case */
+ if (ios->timing == MMC_TIMING_LEGACY)
+ return 0;
+
+ if (host->clock > SDHCI_DEFAULT_SDCLK_FREQ)
+ ret = xenon_hs_delay_adj(host);
+ return ret;
+}
+
+static int add_xenon_phy(struct device_node *np, struct sdhci_host *host,
+ const char *phy_name)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
+ int i, ret;
+
+ for (i = 0; i < NR_PHY_TYPES; i++) {
+ if (!strcmp(phy_name, phy_types[i])) {
+ priv->phy_type = i;
+ break;
+ }
+ }
+ if (i == NR_PHY_TYPES) {
+ dev_err(mmc_dev(host->mmc),
+ "Unable to determine PHY name %s. Use default eMMC 5.1 PHY\n",
+ phy_name);
+ priv->phy_type = EMMC_5_1_PHY;
+ }
+
+ ret = alloc_emmc_phy(priv);
+ if (ret)
+ return ret;
+
+ return emmc_phy_parse_param_dt(host, np, priv->phy_params);
+}
+
+int xenon_phy_parse_dt(struct device_node *np, struct sdhci_host *host)
+{
+ const char *phy_type = NULL;
+
+ if (!of_property_read_string(np, "marvell,xenon-phy-type", &phy_type))
+ return add_xenon_phy(np, host, phy_type);
+
+ dev_info(mmc_dev(host->mmc), "Fail to get Xenon PHY type. Use default eMMC 5.1 PHY\n");
+ return add_xenon_phy(np, host, "emmc 5.1 phy");
+}
@@ -244,6 +244,7 @@ static void xenon_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
spin_unlock_irqrestore(&host->lock, flags);
sdhci_set_ios(mmc, ios);
+ xenon_phy_adj(host, ios);
if (host->clock > SDHCI_DEFAULT_SDCLK_FREQ) {
spin_lock_irqsave(&host->lock, flags);
@@ -482,7 +483,7 @@ static int xenon_probe_dt(struct platform_device *pdev)
}
priv->tuning_count = tuning_count;
- return err;
+ return xenon_phy_parse_dt(np, host);
}
static int xenon_sdhc_probe(struct sdhci_host *host)
@@ -23,8 +23,19 @@
#define SDHCI_SLOT_ENABLE_SHIFT 0
#define SDHCI_SYS_EXT_OP_CTRL 0x010C
+#define SDHCI_MASK_CMD_CONFLICT_ERROR BIT(8)
+
+#define SDHCI_SLOT_OP_STATUS_CTRL 0x0128
+
+#define SDHCI_TUN_CONSECUTIVE_TIMES_SHIFT 16
+#define SDHCI_TUN_CONSECUTIVE_TIMES_MASK 0x7
+#define SDHCI_TUN_CONSECUTIVE_TIMES 0x4
+#define SDHCI_TUNING_STEP_SHIFT 12
+#define SDHCI_TUNING_STEP_MASK 0xF
+#define SDHCI_TUNING_STEP_DIVIDER BIT(6)
#define SDHCI_SLOT_EMMC_CTRL 0x0130
+#define SDHCI_ENABLE_DATA_STROBE BIT(24)
#define SDHCI_EMMC_VCCQ_MASK 0x3
#define SDHCI_EMMC_VCCQ_1_8V 0x1
#define SDHCI_EMMC_VCCQ_3_3V 0x3
@@ -33,11 +44,17 @@
/* retuning compatible */
#define SDHCI_RETUNING_COMPATIBLE 0x1
+#define SDHCI_SLOT_EXT_PRESENT_STATE 0x014C
+#define SDHCI_DLL_LOCK_STATE 0x1
+
+#define SDHCI_SLOT_DLL_CUR_DLY_VAL 0x0150
+
/* Tuning Parameter */
#define SDHCI_TMR_RETUN_NO_PRESENT 0xF
#define SDHCI_DEF_TUNING_COUNT 0x9
#define SDHCI_DEFAULT_SDCLK_FREQ (400000)
+#define SDHCI_LOWEST_SDCLK_FREQ (100000)
/* Xenon specific Mode Select value */
#define SDHCI_XENON_CTRL_HS200 0x5
@@ -65,6 +82,28 @@ struct sdhci_xenon_priv {
* initialization completes.
*/
unsigned int init_card_type;
+
+ /*
+ * The bus_width, timing, and clock fields in below
+ * record the current ios setting of Xenon SDHC.
+ * Driver will adjust PHY setting if any change to
+ * ios affects PHY timing.
+ */
+ unsigned char bus_width;
+ unsigned char timing;
+ unsigned int clock;
+
+ int phy_type;
+ /*
+ * Contains board-specific PHY parameters
+ * passed from device tree.
+ */
+ void *phy_params;
+ struct xenon_emmc_phy_regs *emmc_phy_regs;
};
+
+int xenon_phy_adj(struct sdhci_host *host, struct mmc_ios *ios);
+int xenon_phy_parse_dt(struct device_node *np,
+ struct sdhci_host *host);
#endif