| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Samsung EXYNOS5 SoC series USB DRD PHY driver |
| * |
| * Phy provider for USB 3.0 DRD controller on Exynos5 SoC series |
| * |
| * Copyright (C) 2014 Samsung Electronics Co., Ltd. |
| * Author: Vivek Gautam <gautam.vivek@samsung.com> |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/delay.h> |
| #include <linux/io.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/of_device.h> |
| #include <linux/phy/phy.h> |
| #include <linux/platform_device.h> |
| #include <linux/mutex.h> |
| #include <linux/mfd/syscon.h> |
| #include <linux/regmap.h> |
| #include <linux/regulator/consumer.h> |
| #include <linux/soc/samsung/exynos-regs-pmu.h> |
| |
| /* Exynos USB PHY registers */ |
| #define EXYNOS5_FSEL_9MHZ6 0x0 |
| #define EXYNOS5_FSEL_10MHZ 0x1 |
| #define EXYNOS5_FSEL_12MHZ 0x2 |
| #define EXYNOS5_FSEL_19MHZ2 0x3 |
| #define EXYNOS5_FSEL_20MHZ 0x4 |
| #define EXYNOS5_FSEL_24MHZ 0x5 |
| #define EXYNOS5_FSEL_50MHZ 0x7 |
| |
| /* EXYNOS5: USB 3.0 DRD PHY registers */ |
| #define EXYNOS5_DRD_LINKSYSTEM 0x04 |
| |
| #define LINKSYSTEM_FLADJ_MASK (0x3f << 1) |
| #define LINKSYSTEM_FLADJ(_x) ((_x) << 1) |
| #define LINKSYSTEM_XHCI_VERSION_CONTROL BIT(27) |
| |
| #define EXYNOS5_DRD_PHYUTMI 0x08 |
| |
| #define PHYUTMI_OTGDISABLE BIT(6) |
| #define PHYUTMI_FORCESUSPEND BIT(1) |
| #define PHYUTMI_FORCESLEEP BIT(0) |
| |
| #define EXYNOS5_DRD_PHYPIPE 0x0c |
| |
| #define EXYNOS5_DRD_PHYCLKRST 0x10 |
| |
| #define PHYCLKRST_EN_UTMISUSPEND BIT(31) |
| |
| #define PHYCLKRST_SSC_REFCLKSEL_MASK (0xff << 23) |
| #define PHYCLKRST_SSC_REFCLKSEL(_x) ((_x) << 23) |
| |
| #define PHYCLKRST_SSC_RANGE_MASK (0x03 << 21) |
| #define PHYCLKRST_SSC_RANGE(_x) ((_x) << 21) |
| |
| #define PHYCLKRST_SSC_EN BIT(20) |
| #define PHYCLKRST_REF_SSP_EN BIT(19) |
| #define PHYCLKRST_REF_CLKDIV2 BIT(18) |
| |
| #define PHYCLKRST_MPLL_MULTIPLIER_MASK (0x7f << 11) |
| #define PHYCLKRST_MPLL_MULTIPLIER_100MHZ_REF (0x19 << 11) |
| #define PHYCLKRST_MPLL_MULTIPLIER_50M_REF (0x32 << 11) |
| #define PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF (0x68 << 11) |
| #define PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF (0x7d << 11) |
| #define PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF (0x02 << 11) |
| |
| #define PHYCLKRST_FSEL_UTMI_MASK (0x7 << 5) |
| #define PHYCLKRST_FSEL_PIPE_MASK (0x7 << 8) |
| #define PHYCLKRST_FSEL(_x) ((_x) << 5) |
| #define PHYCLKRST_FSEL_PAD_100MHZ (0x27 << 5) |
| #define PHYCLKRST_FSEL_PAD_24MHZ (0x2a << 5) |
| #define PHYCLKRST_FSEL_PAD_20MHZ (0x31 << 5) |
| #define PHYCLKRST_FSEL_PAD_19_2MHZ (0x38 << 5) |
| |
| #define PHYCLKRST_RETENABLEN BIT(4) |
| |
| #define PHYCLKRST_REFCLKSEL_MASK (0x03 << 2) |
| #define PHYCLKRST_REFCLKSEL_PAD_REFCLK (0x2 << 2) |
| #define PHYCLKRST_REFCLKSEL_EXT_REFCLK (0x3 << 2) |
| |
| #define PHYCLKRST_PORTRESET BIT(1) |
| #define PHYCLKRST_COMMONONN BIT(0) |
| |
| #define EXYNOS5_DRD_PHYREG0 0x14 |
| #define PHYREG0_SSC_REF_CLK_SEL BIT(21) |
| #define PHYREG0_SSC_RANGE BIT(20) |
| #define PHYREG0_CR_WRITE BIT(19) |
| #define PHYREG0_CR_READ BIT(18) |
| #define PHYREG0_CR_DATA_IN(_x) ((_x) << 2) |
| #define PHYREG0_CR_CAP_DATA BIT(1) |
| #define PHYREG0_CR_CAP_ADDR BIT(0) |
| |
| #define EXYNOS5_DRD_PHYREG1 0x18 |
| #define PHYREG1_CR_DATA_OUT(_x) ((_x) << 1) |
| #define PHYREG1_CR_ACK BIT(0) |
| |
| #define EXYNOS5_DRD_PHYPARAM0 0x1c |
| |
| #define PHYPARAM0_REF_USE_PAD BIT(31) |
| #define PHYPARAM0_REF_LOSLEVEL_MASK (0x1f << 26) |
| #define PHYPARAM0_REF_LOSLEVEL (0x9 << 26) |
| |
| #define EXYNOS5_DRD_PHYPARAM1 0x20 |
| |
| #define PHYPARAM1_PCS_TXDEEMPH_MASK (0x1f << 0) |
| #define PHYPARAM1_PCS_TXDEEMPH (0x1c) |
| |
| #define EXYNOS5_DRD_PHYTERM 0x24 |
| |
| #define EXYNOS5_DRD_PHYTEST 0x28 |
| |
| #define PHYTEST_POWERDOWN_SSP BIT(3) |
| #define PHYTEST_POWERDOWN_HSP BIT(2) |
| |
| #define EXYNOS5_DRD_PHYADP 0x2c |
| |
| #define EXYNOS5_DRD_PHYUTMICLKSEL 0x30 |
| |
| #define PHYUTMICLKSEL_UTMI_CLKSEL BIT(2) |
| |
| #define EXYNOS5_DRD_PHYRESUME 0x34 |
| #define EXYNOS5_DRD_LINKPORT 0x44 |
| |
| /* USB 3.0 DRD PHY SS Function Control Reg; accessed by CR_PORT */ |
| #define EXYNOS5_DRD_PHYSS_LOSLEVEL_OVRD_IN (0x15) |
| #define LOSLEVEL_OVRD_IN_LOS_BIAS_5420 (0x5 << 13) |
| #define LOSLEVEL_OVRD_IN_LOS_BIAS_DEFAULT (0x0 << 13) |
| #define LOSLEVEL_OVRD_IN_EN (0x1 << 10) |
| #define LOSLEVEL_OVRD_IN_LOS_LEVEL_DEFAULT (0x9 << 0) |
| |
| #define EXYNOS5_DRD_PHYSS_TX_VBOOSTLEVEL_OVRD_IN (0x12) |
| #define TX_VBOOSTLEVEL_OVRD_IN_VBOOST_5420 (0x5 << 13) |
| #define TX_VBOOSTLEVEL_OVRD_IN_VBOOST_DEFAULT (0x4 << 13) |
| |
| #define EXYNOS5_DRD_PHYSS_LANE0_TX_DEBUG (0x1010) |
| #define LANE0_TX_DEBUG_RXDET_MEAS_TIME_19M2_20M (0x4 << 4) |
| #define LANE0_TX_DEBUG_RXDET_MEAS_TIME_24M (0x8 << 4) |
| #define LANE0_TX_DEBUG_RXDET_MEAS_TIME_25M_26M (0x8 << 4) |
| #define LANE0_TX_DEBUG_RXDET_MEAS_TIME_48M_50M_52M (0x20 << 4) |
| #define LANE0_TX_DEBUG_RXDET_MEAS_TIME_62M5 (0x20 << 4) |
| #define LANE0_TX_DEBUG_RXDET_MEAS_TIME_96M_100M (0x40 << 4) |
| |
| #define KHZ 1000 |
| #define MHZ (KHZ * KHZ) |
| |
| enum exynos5_usbdrd_phy_id { |
| EXYNOS5_DRDPHY_UTMI, |
| EXYNOS5_DRDPHY_PIPE3, |
| EXYNOS5_DRDPHYS_NUM, |
| }; |
| |
| struct phy_usb_instance; |
| struct exynos5_usbdrd_phy; |
| |
| struct exynos5_usbdrd_phy_config { |
| u32 id; |
| void (*phy_isol)(struct phy_usb_instance *inst, u32 on); |
| void (*phy_init)(struct exynos5_usbdrd_phy *phy_drd); |
| unsigned int (*set_refclk)(struct phy_usb_instance *inst); |
| }; |
| |
| struct exynos5_usbdrd_phy_drvdata { |
| const struct exynos5_usbdrd_phy_config *phy_cfg; |
| u32 pmu_offset_usbdrd0_phy; |
| u32 pmu_offset_usbdrd1_phy; |
| bool has_common_clk_gate; |
| }; |
| |
| /** |
| * struct exynos5_usbdrd_phy - driver data for USB 3.0 PHY |
| * @dev: pointer to device instance of this platform device |
| * @reg_phy: usb phy controller register memory base |
| * @clk: phy clock for register access |
| * @pipeclk: clock for pipe3 phy |
| * @utmiclk: clock for utmi+ phy |
| * @itpclk: clock for ITP generation |
| * @drv_data: pointer to SoC level driver data structure |
| * @phys[]: array for 'EXYNOS5_DRDPHYS_NUM' number of PHY |
| * instances each with its 'phy' and 'phy_cfg'. |
| * @extrefclk: frequency select settings when using 'separate |
| * reference clocks' for SS and HS operations |
| * @ref_clk: reference clock to PHY block from which PHY's |
| * operational clocks are derived |
| * vbus: VBUS regulator for phy |
| * vbus_boost: Boost regulator for VBUS present on few Exynos boards |
| */ |
| struct exynos5_usbdrd_phy { |
| struct device *dev; |
| void __iomem *reg_phy; |
| struct clk *clk; |
| struct clk *pipeclk; |
| struct clk *utmiclk; |
| struct clk *itpclk; |
| const struct exynos5_usbdrd_phy_drvdata *drv_data; |
| struct phy_usb_instance { |
| struct phy *phy; |
| u32 index; |
| struct regmap *reg_pmu; |
| u32 pmu_offset; |
| const struct exynos5_usbdrd_phy_config *phy_cfg; |
| } phys[EXYNOS5_DRDPHYS_NUM]; |
| u32 extrefclk; |
| struct clk *ref_clk; |
| struct regulator *vbus; |
| struct regulator *vbus_boost; |
| }; |
| |
| static inline |
| struct exynos5_usbdrd_phy *to_usbdrd_phy(struct phy_usb_instance *inst) |
| { |
| return container_of((inst), struct exynos5_usbdrd_phy, |
| phys[(inst)->index]); |
| } |
| |
| /* |
| * exynos5_rate_to_clk() converts the supplied clock rate to the value that |
| * can be written to the phy register. |
| */ |
| static unsigned int exynos5_rate_to_clk(unsigned long rate, u32 *reg) |
| { |
| /* EXYNOS5_FSEL_MASK */ |
| |
| switch (rate) { |
| case 9600 * KHZ: |
| *reg = EXYNOS5_FSEL_9MHZ6; |
| break; |
| case 10 * MHZ: |
| *reg = EXYNOS5_FSEL_10MHZ; |
| break; |
| case 12 * MHZ: |
| *reg = EXYNOS5_FSEL_12MHZ; |
| break; |
| case 19200 * KHZ: |
| *reg = EXYNOS5_FSEL_19MHZ2; |
| break; |
| case 20 * MHZ: |
| *reg = EXYNOS5_FSEL_20MHZ; |
| break; |
| case 24 * MHZ: |
| *reg = EXYNOS5_FSEL_24MHZ; |
| break; |
| case 50 * MHZ: |
| *reg = EXYNOS5_FSEL_50MHZ; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static void exynos5_usbdrd_phy_isol(struct phy_usb_instance *inst, |
| unsigned int on) |
| { |
| unsigned int val; |
| |
| if (!inst->reg_pmu) |
| return; |
| |
| val = on ? 0 : EXYNOS4_PHY_ENABLE; |
| |
| regmap_update_bits(inst->reg_pmu, inst->pmu_offset, |
| EXYNOS4_PHY_ENABLE, val); |
| } |
| |
| /* |
| * Sets the pipe3 phy's clk as EXTREFCLK (XXTI) which is internal clock |
| * from clock core. Further sets multiplier values and spread spectrum |
| * clock settings for SuperSpeed operations. |
| */ |
| static unsigned int |
| exynos5_usbdrd_pipe3_set_refclk(struct phy_usb_instance *inst) |
| { |
| u32 reg; |
| struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst); |
| |
| /* restore any previous reference clock settings */ |
| reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST); |
| |
| /* Use EXTREFCLK as ref clock */ |
| reg &= ~PHYCLKRST_REFCLKSEL_MASK; |
| reg |= PHYCLKRST_REFCLKSEL_EXT_REFCLK; |
| |
| /* FSEL settings corresponding to reference clock */ |
| reg &= ~PHYCLKRST_FSEL_PIPE_MASK | |
| PHYCLKRST_MPLL_MULTIPLIER_MASK | |
| PHYCLKRST_SSC_REFCLKSEL_MASK; |
| switch (phy_drd->extrefclk) { |
| case EXYNOS5_FSEL_50MHZ: |
| reg |= (PHYCLKRST_MPLL_MULTIPLIER_50M_REF | |
| PHYCLKRST_SSC_REFCLKSEL(0x00)); |
| break; |
| case EXYNOS5_FSEL_24MHZ: |
| reg |= (PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF | |
| PHYCLKRST_SSC_REFCLKSEL(0x88)); |
| break; |
| case EXYNOS5_FSEL_20MHZ: |
| reg |= (PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF | |
| PHYCLKRST_SSC_REFCLKSEL(0x00)); |
| break; |
| case EXYNOS5_FSEL_19MHZ2: |
| reg |= (PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF | |
| PHYCLKRST_SSC_REFCLKSEL(0x88)); |
| break; |
| default: |
| dev_dbg(phy_drd->dev, "unsupported ref clk\n"); |
| break; |
| } |
| |
| return reg; |
| } |
| |
| /* |
| * Sets the utmi phy's clk as EXTREFCLK (XXTI) which is internal clock |
| * from clock core. Further sets the FSEL values for HighSpeed operations. |
| */ |
| static unsigned int |
| exynos5_usbdrd_utmi_set_refclk(struct phy_usb_instance *inst) |
| { |
| u32 reg; |
| struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst); |
| |
| /* restore any previous reference clock settings */ |
| reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST); |
| |
| reg &= ~PHYCLKRST_REFCLKSEL_MASK; |
| reg |= PHYCLKRST_REFCLKSEL_EXT_REFCLK; |
| |
| reg &= ~PHYCLKRST_FSEL_UTMI_MASK | |
| PHYCLKRST_MPLL_MULTIPLIER_MASK | |
| PHYCLKRST_SSC_REFCLKSEL_MASK; |
| reg |= PHYCLKRST_FSEL(phy_drd->extrefclk); |
| |
| return reg; |
| } |
| |
| static void exynos5_usbdrd_pipe3_init(struct exynos5_usbdrd_phy *phy_drd) |
| { |
| u32 reg; |
| |
| reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1); |
| /* Set Tx De-Emphasis level */ |
| reg &= ~PHYPARAM1_PCS_TXDEEMPH_MASK; |
| reg |= PHYPARAM1_PCS_TXDEEMPH; |
| writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1); |
| |
| reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST); |
| reg &= ~PHYTEST_POWERDOWN_SSP; |
| writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST); |
| } |
| |
| static void exynos5_usbdrd_utmi_init(struct exynos5_usbdrd_phy *phy_drd) |
| { |
| u32 reg; |
| |
| reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0); |
| /* Set Loss-of-Signal Detector sensitivity */ |
| reg &= ~PHYPARAM0_REF_LOSLEVEL_MASK; |
| reg |= PHYPARAM0_REF_LOSLEVEL; |
| writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0); |
| |
| reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1); |
| /* Set Tx De-Emphasis level */ |
| reg &= ~PHYPARAM1_PCS_TXDEEMPH_MASK; |
| reg |= PHYPARAM1_PCS_TXDEEMPH; |
| writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1); |
| |
| /* UTMI Power Control */ |
| writel(PHYUTMI_OTGDISABLE, phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMI); |
| |
| reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST); |
| reg &= ~PHYTEST_POWERDOWN_HSP; |
| writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST); |
| } |
| |
| static int exynos5_usbdrd_phy_init(struct phy *phy) |
| { |
| int ret; |
| u32 reg; |
| struct phy_usb_instance *inst = phy_get_drvdata(phy); |
| struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst); |
| |
| ret = clk_prepare_enable(phy_drd->clk); |
| if (ret) |
| return ret; |
| |
| /* Reset USB 3.0 PHY */ |
| writel(0x0, phy_drd->reg_phy + EXYNOS5_DRD_PHYREG0); |
| writel(0x0, phy_drd->reg_phy + EXYNOS5_DRD_PHYRESUME); |
| |
| /* |
| * Setting the Frame length Adj value[6:1] to default 0x20 |
| * See xHCI 1.0 spec, 5.2.4 |
| */ |
| reg = LINKSYSTEM_XHCI_VERSION_CONTROL | |
| LINKSYSTEM_FLADJ(0x20); |
| writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_LINKSYSTEM); |
| |
| reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0); |
| /* Select PHY CLK source */ |
| reg &= ~PHYPARAM0_REF_USE_PAD; |
| writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0); |
| |
| /* This bit must be set for both HS and SS operations */ |
| reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMICLKSEL); |
| reg |= PHYUTMICLKSEL_UTMI_CLKSEL; |
| writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMICLKSEL); |
| |
| /* UTMI or PIPE3 specific init */ |
| inst->phy_cfg->phy_init(phy_drd); |
| |
| /* reference clock settings */ |
| reg = inst->phy_cfg->set_refclk(inst); |
| |
| /* Digital power supply in normal operating mode */ |
| reg |= PHYCLKRST_RETENABLEN | |
| /* Enable ref clock for SS function */ |
| PHYCLKRST_REF_SSP_EN | |
| /* Enable spread spectrum */ |
| PHYCLKRST_SSC_EN | |
| /* Power down HS Bias and PLL blocks in suspend mode */ |
| PHYCLKRST_COMMONONN | |
| /* Reset the port */ |
| PHYCLKRST_PORTRESET; |
| |
| writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST); |
| |
| udelay(10); |
| |
| reg &= ~PHYCLKRST_PORTRESET; |
| writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST); |
| |
| clk_disable_unprepare(phy_drd->clk); |
| |
| return 0; |
| } |
| |
| static int exynos5_usbdrd_phy_exit(struct phy *phy) |
| { |
| int ret; |
| u32 reg; |
| struct phy_usb_instance *inst = phy_get_drvdata(phy); |
| struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst); |
| |
| ret = clk_prepare_enable(phy_drd->clk); |
| if (ret) |
| return ret; |
| |
| reg = PHYUTMI_OTGDISABLE | |
| PHYUTMI_FORCESUSPEND | |
| PHYUTMI_FORCESLEEP; |
| writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMI); |
| |
| /* Resetting the PHYCLKRST enable bits to reduce leakage current */ |
| reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST); |
| reg &= ~(PHYCLKRST_REF_SSP_EN | |
| PHYCLKRST_SSC_EN | |
| PHYCLKRST_COMMONONN); |
| writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST); |
| |
| /* Control PHYTEST to remove leakage current */ |
| reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST); |
| reg |= PHYTEST_POWERDOWN_SSP | |
| PHYTEST_POWERDOWN_HSP; |
| writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST); |
| |
| clk_disable_unprepare(phy_drd->clk); |
| |
| return 0; |
| } |
| |
| static int exynos5_usbdrd_phy_power_on(struct phy *phy) |
| { |
| int ret; |
| struct phy_usb_instance *inst = phy_get_drvdata(phy); |
| struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst); |
| |
| dev_dbg(phy_drd->dev, "Request to power_on usbdrd_phy phy\n"); |
| |
| clk_prepare_enable(phy_drd->ref_clk); |
| if (!phy_drd->drv_data->has_common_clk_gate) { |
| clk_prepare_enable(phy_drd->pipeclk); |
| clk_prepare_enable(phy_drd->utmiclk); |
| clk_prepare_enable(phy_drd->itpclk); |
| } |
| |
| /* Enable VBUS supply */ |
| if (phy_drd->vbus_boost) { |
| ret = regulator_enable(phy_drd->vbus_boost); |
| if (ret) { |
| dev_err(phy_drd->dev, |
| "Failed to enable VBUS boost supply\n"); |
| goto fail_vbus; |
| } |
| } |
| |
| if (phy_drd->vbus) { |
| ret = regulator_enable(phy_drd->vbus); |
| if (ret) { |
| dev_err(phy_drd->dev, "Failed to enable VBUS supply\n"); |
| goto fail_vbus_boost; |
| } |
| } |
| |
| /* Power-on PHY*/ |
| inst->phy_cfg->phy_isol(inst, 0); |
| |
| return 0; |
| |
| fail_vbus_boost: |
| if (phy_drd->vbus_boost) |
| regulator_disable(phy_drd->vbus_boost); |
| |
| fail_vbus: |
| clk_disable_unprepare(phy_drd->ref_clk); |
| if (!phy_drd->drv_data->has_common_clk_gate) { |
| clk_disable_unprepare(phy_drd->itpclk); |
| clk_disable_unprepare(phy_drd->utmiclk); |
| clk_disable_unprepare(phy_drd->pipeclk); |
| } |
| |
| return ret; |
| } |
| |
| static int exynos5_usbdrd_phy_power_off(struct phy *phy) |
| { |
| struct phy_usb_instance *inst = phy_get_drvdata(phy); |
| struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst); |
| |
| dev_dbg(phy_drd->dev, "Request to power_off usbdrd_phy phy\n"); |
| |
| /* Power-off the PHY */ |
| inst->phy_cfg->phy_isol(inst, 1); |
| |
| /* Disable VBUS supply */ |
| if (phy_drd->vbus) |
| regulator_disable(phy_drd->vbus); |
| if (phy_drd->vbus_boost) |
| regulator_disable(phy_drd->vbus_boost); |
| |
| clk_disable_unprepare(phy_drd->ref_clk); |
| if (!phy_drd->drv_data->has_common_clk_gate) { |
| clk_disable_unprepare(phy_drd->itpclk); |
| clk_disable_unprepare(phy_drd->pipeclk); |
| clk_disable_unprepare(phy_drd->utmiclk); |
| } |
| |
| return 0; |
| } |
| |
| static int crport_handshake(struct exynos5_usbdrd_phy *phy_drd, |
| u32 val, u32 cmd) |
| { |
| u32 usec = 100; |
| unsigned int result; |
| |
| writel(val | cmd, phy_drd->reg_phy + EXYNOS5_DRD_PHYREG0); |
| |
| do { |
| result = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYREG1); |
| if (result & PHYREG1_CR_ACK) |
| break; |
| |
| udelay(1); |
| } while (usec-- > 0); |
| |
| if (!usec) { |
| dev_err(phy_drd->dev, |
| "CRPORT handshake timeout1 (0x%08x)\n", val); |
| return -ETIME; |
| } |
| |
| usec = 100; |
| |
| writel(val, phy_drd->reg_phy + EXYNOS5_DRD_PHYREG0); |
| |
| do { |
| result = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYREG1); |
| if (!(result & PHYREG1_CR_ACK)) |
| break; |
| |
| udelay(1); |
| } while (usec-- > 0); |
| |
| if (!usec) { |
| dev_err(phy_drd->dev, |
| "CRPORT handshake timeout2 (0x%08x)\n", val); |
| return -ETIME; |
| } |
| |
| return 0; |
| } |
| |
| static int crport_ctrl_write(struct exynos5_usbdrd_phy *phy_drd, |
| u32 addr, u32 data) |
| { |
| int ret; |
| |
| /* Write Address */ |
| writel(PHYREG0_CR_DATA_IN(addr), |
| phy_drd->reg_phy + EXYNOS5_DRD_PHYREG0); |
| ret = crport_handshake(phy_drd, PHYREG0_CR_DATA_IN(addr), |
| PHYREG0_CR_CAP_ADDR); |
| if (ret) |
| return ret; |
| |
| /* Write Data */ |
| writel(PHYREG0_CR_DATA_IN(data), |
| phy_drd->reg_phy + EXYNOS5_DRD_PHYREG0); |
| ret = crport_handshake(phy_drd, PHYREG0_CR_DATA_IN(data), |
| PHYREG0_CR_CAP_DATA); |
| if (ret) |
| return ret; |
| |
| ret = crport_handshake(phy_drd, PHYREG0_CR_DATA_IN(data), |
| PHYREG0_CR_WRITE); |
| |
| return ret; |
| } |
| |
| /* |
| * Calibrate few PHY parameters using CR_PORT register to meet |
| * SuperSpeed requirements on Exynos5420 and Exynos5800 systems, |
| * which have 28nm USB 3.0 DRD PHY. |
| */ |
| static int exynos5420_usbdrd_phy_calibrate(struct exynos5_usbdrd_phy *phy_drd) |
| { |
| unsigned int temp; |
| int ret = 0; |
| |
| /* |
| * Change los_bias to (0x5) for 28nm PHY from a |
| * default value (0x0); los_level is set as default |
| * (0x9) as also reflected in los_level[30:26] bits |
| * of PHYPARAM0 register. |
| */ |
| temp = LOSLEVEL_OVRD_IN_LOS_BIAS_5420 | |
| LOSLEVEL_OVRD_IN_EN | |
| LOSLEVEL_OVRD_IN_LOS_LEVEL_DEFAULT; |
| ret = crport_ctrl_write(phy_drd, |
| EXYNOS5_DRD_PHYSS_LOSLEVEL_OVRD_IN, |
| temp); |
| if (ret) { |
| dev_err(phy_drd->dev, |
| "Failed setting Loss-of-Signal level for SuperSpeed\n"); |
| return ret; |
| } |
| |
| /* |
| * Set tx_vboost_lvl to (0x5) for 28nm PHY Tuning, |
| * to raise Tx signal level from its default value of (0x4) |
| */ |
| temp = TX_VBOOSTLEVEL_OVRD_IN_VBOOST_5420; |
| ret = crport_ctrl_write(phy_drd, |
| EXYNOS5_DRD_PHYSS_TX_VBOOSTLEVEL_OVRD_IN, |
| temp); |
| if (ret) { |
| dev_err(phy_drd->dev, |
| "Failed setting Tx-Vboost-Level for SuperSpeed\n"); |
| return ret; |
| } |
| |
| /* |
| * Set proper time to wait for RxDetect measurement, for |
| * desired reference clock of PHY, by tuning the CR_PORT |
| * register LANE0.TX_DEBUG which is internal to PHY. |
| * This fixes issue with few USB 3.0 devices, which are |
| * not detected (not even generate interrupts on the bus |
| * on insertion) without this change. |
| * e.g. Samsung SUM-TSB16S 3.0 USB drive. |
| */ |
| switch (phy_drd->extrefclk) { |
| case EXYNOS5_FSEL_50MHZ: |
| temp = LANE0_TX_DEBUG_RXDET_MEAS_TIME_48M_50M_52M; |
| break; |
| case EXYNOS5_FSEL_20MHZ: |
| case EXYNOS5_FSEL_19MHZ2: |
| temp = LANE0_TX_DEBUG_RXDET_MEAS_TIME_19M2_20M; |
| break; |
| case EXYNOS5_FSEL_24MHZ: |
| default: |
| temp = LANE0_TX_DEBUG_RXDET_MEAS_TIME_24M; |
| break; |
| } |
| |
| ret = crport_ctrl_write(phy_drd, |
| EXYNOS5_DRD_PHYSS_LANE0_TX_DEBUG, |
| temp); |
| if (ret) |
| dev_err(phy_drd->dev, |
| "Fail to set RxDet measurement time for SuperSpeed\n"); |
| |
| return ret; |
| } |
| |
| static struct phy *exynos5_usbdrd_phy_xlate(struct device *dev, |
| struct of_phandle_args *args) |
| { |
| struct exynos5_usbdrd_phy *phy_drd = dev_get_drvdata(dev); |
| |
| if (WARN_ON(args->args[0] >= EXYNOS5_DRDPHYS_NUM)) |
| return ERR_PTR(-ENODEV); |
| |
| return phy_drd->phys[args->args[0]].phy; |
| } |
| |
| static int exynos5_usbdrd_phy_calibrate(struct phy *phy) |
| { |
| struct phy_usb_instance *inst = phy_get_drvdata(phy); |
| struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst); |
| |
| if (inst->phy_cfg->id == EXYNOS5_DRDPHY_UTMI) |
| return exynos5420_usbdrd_phy_calibrate(phy_drd); |
| return 0; |
| } |
| |
| static const struct phy_ops exynos5_usbdrd_phy_ops = { |
| .init = exynos5_usbdrd_phy_init, |
| .exit = exynos5_usbdrd_phy_exit, |
| .power_on = exynos5_usbdrd_phy_power_on, |
| .power_off = exynos5_usbdrd_phy_power_off, |
| .calibrate = exynos5_usbdrd_phy_calibrate, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int exynos5_usbdrd_phy_clk_handle(struct exynos5_usbdrd_phy *phy_drd) |
| { |
| unsigned long ref_rate; |
| int ret; |
| |
| phy_drd->clk = devm_clk_get(phy_drd->dev, "phy"); |
| if (IS_ERR(phy_drd->clk)) { |
| dev_err(phy_drd->dev, "Failed to get phy clock\n"); |
| return PTR_ERR(phy_drd->clk); |
| } |
| |
| phy_drd->ref_clk = devm_clk_get(phy_drd->dev, "ref"); |
| if (IS_ERR(phy_drd->ref_clk)) { |
| dev_err(phy_drd->dev, "Failed to get phy reference clock\n"); |
| return PTR_ERR(phy_drd->ref_clk); |
| } |
| ref_rate = clk_get_rate(phy_drd->ref_clk); |
| |
| ret = exynos5_rate_to_clk(ref_rate, &phy_drd->extrefclk); |
| if (ret) { |
| dev_err(phy_drd->dev, "Clock rate (%ld) not supported\n", |
| ref_rate); |
| return ret; |
| } |
| |
| if (!phy_drd->drv_data->has_common_clk_gate) { |
| phy_drd->pipeclk = devm_clk_get(phy_drd->dev, "phy_pipe"); |
| if (IS_ERR(phy_drd->pipeclk)) { |
| dev_info(phy_drd->dev, |
| "PIPE3 phy operational clock not specified\n"); |
| phy_drd->pipeclk = NULL; |
| } |
| |
| phy_drd->utmiclk = devm_clk_get(phy_drd->dev, "phy_utmi"); |
| if (IS_ERR(phy_drd->utmiclk)) { |
| dev_info(phy_drd->dev, |
| "UTMI phy operational clock not specified\n"); |
| phy_drd->utmiclk = NULL; |
| } |
| |
| phy_drd->itpclk = devm_clk_get(phy_drd->dev, "itp"); |
| if (IS_ERR(phy_drd->itpclk)) { |
| dev_info(phy_drd->dev, |
| "ITP clock from main OSC not specified\n"); |
| phy_drd->itpclk = NULL; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static const struct exynos5_usbdrd_phy_config phy_cfg_exynos5[] = { |
| { |
| .id = EXYNOS5_DRDPHY_UTMI, |
| .phy_isol = exynos5_usbdrd_phy_isol, |
| .phy_init = exynos5_usbdrd_utmi_init, |
| .set_refclk = exynos5_usbdrd_utmi_set_refclk, |
| }, |
| { |
| .id = EXYNOS5_DRDPHY_PIPE3, |
| .phy_isol = exynos5_usbdrd_phy_isol, |
| .phy_init = exynos5_usbdrd_pipe3_init, |
| .set_refclk = exynos5_usbdrd_pipe3_set_refclk, |
| }, |
| }; |
| |
| static const struct exynos5_usbdrd_phy_drvdata exynos5420_usbdrd_phy = { |
| .phy_cfg = phy_cfg_exynos5, |
| .pmu_offset_usbdrd0_phy = EXYNOS5_USBDRD_PHY_CONTROL, |
| .pmu_offset_usbdrd1_phy = EXYNOS5420_USBDRD1_PHY_CONTROL, |
| .has_common_clk_gate = true, |
| }; |
| |
| static const struct exynos5_usbdrd_phy_drvdata exynos5250_usbdrd_phy = { |
| .phy_cfg = phy_cfg_exynos5, |
| .pmu_offset_usbdrd0_phy = EXYNOS5_USBDRD_PHY_CONTROL, |
| .has_common_clk_gate = true, |
| }; |
| |
| static const struct exynos5_usbdrd_phy_drvdata exynos5433_usbdrd_phy = { |
| .phy_cfg = phy_cfg_exynos5, |
| .pmu_offset_usbdrd0_phy = EXYNOS5_USBDRD_PHY_CONTROL, |
| .pmu_offset_usbdrd1_phy = EXYNOS5433_USBHOST30_PHY_CONTROL, |
| .has_common_clk_gate = false, |
| }; |
| |
| static const struct exynos5_usbdrd_phy_drvdata exynos7_usbdrd_phy = { |
| .phy_cfg = phy_cfg_exynos5, |
| .pmu_offset_usbdrd0_phy = EXYNOS5_USBDRD_PHY_CONTROL, |
| .has_common_clk_gate = false, |
| }; |
| |
| static const struct of_device_id exynos5_usbdrd_phy_of_match[] = { |
| { |
| .compatible = "samsung,exynos5250-usbdrd-phy", |
| .data = &exynos5250_usbdrd_phy |
| }, { |
| .compatible = "samsung,exynos5420-usbdrd-phy", |
| .data = &exynos5420_usbdrd_phy |
| }, { |
| .compatible = "samsung,exynos5433-usbdrd-phy", |
| .data = &exynos5433_usbdrd_phy |
| }, { |
| .compatible = "samsung,exynos7-usbdrd-phy", |
| .data = &exynos7_usbdrd_phy |
| }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(of, exynos5_usbdrd_phy_of_match); |
| |
| static int exynos5_usbdrd_phy_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct device_node *node = dev->of_node; |
| struct exynos5_usbdrd_phy *phy_drd; |
| struct phy_provider *phy_provider; |
| struct resource *res; |
| const struct exynos5_usbdrd_phy_drvdata *drv_data; |
| struct regmap *reg_pmu; |
| u32 pmu_offset; |
| int i, ret; |
| int channel; |
| |
| phy_drd = devm_kzalloc(dev, sizeof(*phy_drd), GFP_KERNEL); |
| if (!phy_drd) |
| return -ENOMEM; |
| |
| dev_set_drvdata(dev, phy_drd); |
| phy_drd->dev = dev; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| phy_drd->reg_phy = devm_ioremap_resource(dev, res); |
| if (IS_ERR(phy_drd->reg_phy)) |
| return PTR_ERR(phy_drd->reg_phy); |
| |
| drv_data = of_device_get_match_data(dev); |
| if (!drv_data) |
| return -EINVAL; |
| |
| phy_drd->drv_data = drv_data; |
| |
| ret = exynos5_usbdrd_phy_clk_handle(phy_drd); |
| if (ret) { |
| dev_err(dev, "Failed to initialize clocks\n"); |
| return ret; |
| } |
| |
| reg_pmu = syscon_regmap_lookup_by_phandle(dev->of_node, |
| "samsung,pmu-syscon"); |
| if (IS_ERR(reg_pmu)) { |
| dev_err(dev, "Failed to lookup PMU regmap\n"); |
| return PTR_ERR(reg_pmu); |
| } |
| |
| /* |
| * Exynos5420 SoC has multiple channels for USB 3.0 PHY, with |
| * each having separate power control registers. |
| * 'channel' facilitates to set such registers. |
| */ |
| channel = of_alias_get_id(node, "usbdrdphy"); |
| if (channel < 0) |
| dev_dbg(dev, "Not a multi-controller usbdrd phy\n"); |
| |
| switch (channel) { |
| case 1: |
| pmu_offset = phy_drd->drv_data->pmu_offset_usbdrd1_phy; |
| break; |
| case 0: |
| default: |
| pmu_offset = phy_drd->drv_data->pmu_offset_usbdrd0_phy; |
| break; |
| } |
| |
| /* Get Vbus regulators */ |
| phy_drd->vbus = devm_regulator_get(dev, "vbus"); |
| if (IS_ERR(phy_drd->vbus)) { |
| ret = PTR_ERR(phy_drd->vbus); |
| if (ret == -EPROBE_DEFER) |
| return ret; |
| |
| dev_warn(dev, "Failed to get VBUS supply regulator\n"); |
| phy_drd->vbus = NULL; |
| } |
| |
| phy_drd->vbus_boost = devm_regulator_get(dev, "vbus-boost"); |
| if (IS_ERR(phy_drd->vbus_boost)) { |
| ret = PTR_ERR(phy_drd->vbus_boost); |
| if (ret == -EPROBE_DEFER) |
| return ret; |
| |
| dev_warn(dev, "Failed to get VBUS boost supply regulator\n"); |
| phy_drd->vbus_boost = NULL; |
| } |
| |
| dev_vdbg(dev, "Creating usbdrd_phy phy\n"); |
| |
| for (i = 0; i < EXYNOS5_DRDPHYS_NUM; i++) { |
| struct phy *phy = devm_phy_create(dev, NULL, |
| &exynos5_usbdrd_phy_ops); |
| if (IS_ERR(phy)) { |
| dev_err(dev, "Failed to create usbdrd_phy phy\n"); |
| return PTR_ERR(phy); |
| } |
| |
| phy_drd->phys[i].phy = phy; |
| phy_drd->phys[i].index = i; |
| phy_drd->phys[i].reg_pmu = reg_pmu; |
| phy_drd->phys[i].pmu_offset = pmu_offset; |
| phy_drd->phys[i].phy_cfg = &drv_data->phy_cfg[i]; |
| phy_set_drvdata(phy, &phy_drd->phys[i]); |
| } |
| |
| phy_provider = devm_of_phy_provider_register(dev, |
| exynos5_usbdrd_phy_xlate); |
| if (IS_ERR(phy_provider)) { |
| dev_err(phy_drd->dev, "Failed to register phy provider\n"); |
| return PTR_ERR(phy_provider); |
| } |
| |
| return 0; |
| } |
| |
| static struct platform_driver exynos5_usb3drd_phy = { |
| .probe = exynos5_usbdrd_phy_probe, |
| .driver = { |
| .of_match_table = exynos5_usbdrd_phy_of_match, |
| .name = "exynos5_usb3drd_phy", |
| .suppress_bind_attrs = true, |
| } |
| }; |
| |
| module_platform_driver(exynos5_usb3drd_phy); |
| MODULE_DESCRIPTION("Samsung EXYNOS5 SoCs USB 3.0 DRD controller PHY driver"); |
| MODULE_AUTHOR("Vivek Gautam <gautam.vivek@samsung.com>"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("platform:exynos5_usb3drd_phy"); |