usb: phy: tegra: Fix wrong PHY parameters

[deliverable/linux.git] / drivers / usb / phy / phy-tegra-usb.c

/*
 * Copyright (C) 2010 Google, Inc.
 * Copyright (C) 2013 NVIDIA Corporation
 *
 * Author:
 *      Erik Gilling <konkers@google.com>
 *      Benoit Goby <benoit@android.com>
 *      Venu Byravarasu <vbyravarasu@nvidia.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/resource.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/usb/otg.h>
#include <linux/usb/ulpi.h>
#include <linux/usb/of.h>
#include <asm/mach-types.h>
#include <linux/usb/ehci_def.h>
#include <linux/usb/tegra_usb_phy.h>
#include <linux/regulator/consumer.h>

#define ULPI_VIEWPORT           0x170

/* PORTSC registers */
#define TEGRA_USB_PORTSC1                               0x184
#define TEGRA_USB_PORTSC1_PTS(x)                        (((x) & 0x3) << 30)
#define TEGRA_USB_PORTSC1_PHCD                          (1 << 23)

/* Bits of PORTSC1, which will get cleared by writing 1 into them */
#define TEGRA_PORTSC1_RWC_BITS  (PORT_CSC | PORT_PEC | PORT_OCC)

#define USB_SUSP_CTRL           0x400
#define   USB_WAKE_ON_CNNT_EN_DEV       (1 << 3)
#define   USB_WAKE_ON_DISCON_EN_DEV     (1 << 4)
#define   USB_SUSP_CLR          (1 << 5)
#define   USB_PHY_CLK_VALID     (1 << 7)
#define   UTMIP_RESET                   (1 << 11)
#define   UHSIC_RESET                   (1 << 11)
#define   UTMIP_PHY_ENABLE              (1 << 12)
#define   ULPI_PHY_ENABLE       (1 << 13)
#define   USB_SUSP_SET          (1 << 14)
#define   USB_WAKEUP_DEBOUNCE_COUNT(x)  (((x) & 0x7) << 16)

#define USB1_LEGACY_CTRL        0x410
#define   USB1_NO_LEGACY_MODE                   (1 << 0)
#define   USB1_VBUS_SENSE_CTL_MASK              (3 << 1)
#define   USB1_VBUS_SENSE_CTL_VBUS_WAKEUP       (0 << 1)
#define   USB1_VBUS_SENSE_CTL_AB_SESS_VLD_OR_VBUS_WAKEUP \
                                                (1 << 1)
#define   USB1_VBUS_SENSE_CTL_AB_SESS_VLD       (2 << 1)
#define   USB1_VBUS_SENSE_CTL_A_SESS_VLD        (3 << 1)

#define ULPI_TIMING_CTRL_0      0x424
#define   ULPI_OUTPUT_PINMUX_BYP        (1 << 10)
#define   ULPI_CLKOUT_PINMUX_BYP        (1 << 11)

#define ULPI_TIMING_CTRL_1      0x428
#define   ULPI_DATA_TRIMMER_LOAD        (1 << 0)
#define   ULPI_DATA_TRIMMER_SEL(x)      (((x) & 0x7) << 1)
#define   ULPI_STPDIRNXT_TRIMMER_LOAD   (1 << 16)
#define   ULPI_STPDIRNXT_TRIMMER_SEL(x) (((x) & 0x7) << 17)
#define   ULPI_DIR_TRIMMER_LOAD         (1 << 24)
#define   ULPI_DIR_TRIMMER_SEL(x)       (((x) & 0x7) << 25)

#define UTMIP_PLL_CFG1          0x804
#define   UTMIP_XTAL_FREQ_COUNT(x)              (((x) & 0xfff) << 0)
#define   UTMIP_PLLU_ENABLE_DLY_COUNT(x)        (((x) & 0x1f) << 27)

#define UTMIP_XCVR_CFG0         0x808
#define   UTMIP_XCVR_SETUP(x)                   (((x) & 0xf) << 0)
#define   UTMIP_XCVR_SETUP_MSB(x)               ((((x) & 0x70) >> 4) << 22)
#define   UTMIP_XCVR_LSRSLEW(x)                 (((x) & 0x3) << 8)
#define   UTMIP_XCVR_LSFSLEW(x)                 (((x) & 0x3) << 10)
#define   UTMIP_FORCE_PD_POWERDOWN              (1 << 14)
#define   UTMIP_FORCE_PD2_POWERDOWN             (1 << 16)
#define   UTMIP_FORCE_PDZI_POWERDOWN            (1 << 18)
#define   UTMIP_XCVR_LSBIAS_SEL                 (1 << 21)
#define   UTMIP_XCVR_HSSLEW_MSB(x)              (((x) & 0x7f) << 25)

#define UTMIP_BIAS_CFG0         0x80c
#define   UTMIP_OTGPD                   (1 << 11)
#define   UTMIP_BIASPD                  (1 << 10)

#define UTMIP_HSRX_CFG0         0x810
#define   UTMIP_ELASTIC_LIMIT(x)        (((x) & 0x1f) << 10)
#define   UTMIP_IDLE_WAIT(x)            (((x) & 0x1f) << 15)

#define UTMIP_HSRX_CFG1         0x814
#define   UTMIP_HS_SYNC_START_DLY(x)    (((x) & 0x1f) << 1)

#define UTMIP_TX_CFG0           0x820
#define   UTMIP_FS_PREABMLE_J           (1 << 19)
#define   UTMIP_HS_DISCON_DISABLE       (1 << 8)

#define UTMIP_MISC_CFG0         0x824
#define   UTMIP_DPDM_OBSERVE            (1 << 26)
#define   UTMIP_DPDM_OBSERVE_SEL(x)     (((x) & 0xf) << 27)
#define   UTMIP_DPDM_OBSERVE_SEL_FS_J   UTMIP_DPDM_OBSERVE_SEL(0xf)
#define   UTMIP_DPDM_OBSERVE_SEL_FS_K   UTMIP_DPDM_OBSERVE_SEL(0xe)
#define   UTMIP_DPDM_OBSERVE_SEL_FS_SE1 UTMIP_DPDM_OBSERVE_SEL(0xd)
#define   UTMIP_DPDM_OBSERVE_SEL_FS_SE0 UTMIP_DPDM_OBSERVE_SEL(0xc)
#define   UTMIP_SUSPEND_EXIT_ON_EDGE    (1 << 22)

#define UTMIP_MISC_CFG1         0x828
#define   UTMIP_PLL_ACTIVE_DLY_COUNT(x) (((x) & 0x1f) << 18)
#define   UTMIP_PLLU_STABLE_COUNT(x)    (((x) & 0xfff) << 6)

#define UTMIP_DEBOUNCE_CFG0     0x82c
#define   UTMIP_BIAS_DEBOUNCE_A(x)      (((x) & 0xffff) << 0)

#define UTMIP_BAT_CHRG_CFG0     0x830
#define   UTMIP_PD_CHRG                 (1 << 0)

#define UTMIP_SPARE_CFG0        0x834
#define   FUSE_SETUP_SEL                (1 << 3)

#define UTMIP_XCVR_CFG1         0x838
#define   UTMIP_FORCE_PDDISC_POWERDOWN  (1 << 0)
#define   UTMIP_FORCE_PDCHRP_POWERDOWN  (1 << 2)
#define   UTMIP_FORCE_PDDR_POWERDOWN    (1 << 4)
#define   UTMIP_XCVR_TERM_RANGE_ADJ(x)  (((x) & 0xf) << 18)

#define UTMIP_BIAS_CFG1         0x83c
#define   UTMIP_BIAS_PDTRK_COUNT(x)     (((x) & 0x1f) << 3)

static DEFINE_SPINLOCK(utmip_pad_lock);
static int utmip_pad_count;

struct tegra_xtal_freq {
        int freq;
        u8 enable_delay;
        u8 stable_count;
        u8 active_delay;
        u8 xtal_freq_count;
        u16 debounce;
};

static const struct tegra_xtal_freq tegra_freq_table[] = {
        {
                .freq = 12000000,
                .enable_delay = 0x02,
                .stable_count = 0x2F,
                .active_delay = 0x04,
                .xtal_freq_count = 0x76,
                .debounce = 0x7530,
        },
        {
                .freq = 13000000,
                .enable_delay = 0x02,
                .stable_count = 0x33,
                .active_delay = 0x05,
                .xtal_freq_count = 0x7F,
                .debounce = 0x7EF4,
        },
        {
                .freq = 19200000,
                .enable_delay = 0x03,
                .stable_count = 0x4B,
                .active_delay = 0x06,
                .xtal_freq_count = 0xBB,
                .debounce = 0xBB80,
        },
        {
                .freq = 26000000,
                .enable_delay = 0x04,
                .stable_count = 0x66,
                .active_delay = 0x09,
                .xtal_freq_count = 0xFE,
                .debounce = 0xFDE8,
        },
};

static void set_pts(struct tegra_usb_phy *phy, u8 pts_val)
{
        void __iomem *base = phy->regs;
        unsigned long val;

        val = readl(base + TEGRA_USB_PORTSC1) & ~TEGRA_PORTSC1_RWC_BITS;
        val &= ~TEGRA_USB_PORTSC1_PTS(3);
        val |= TEGRA_USB_PORTSC1_PTS(pts_val & 3);
        writel(val, base + TEGRA_USB_PORTSC1);
}

static void set_phcd(struct tegra_usb_phy *phy, bool enable)
{
        void __iomem *base = phy->regs;
        unsigned long val;

        val = readl(base + TEGRA_USB_PORTSC1) & ~TEGRA_PORTSC1_RWC_BITS;
        if (enable)
                val |= TEGRA_USB_PORTSC1_PHCD;
        else
                val &= ~TEGRA_USB_PORTSC1_PHCD;
        writel(val, base + TEGRA_USB_PORTSC1);
}

static int utmip_pad_open(struct tegra_usb_phy *phy)
{
        phy->pad_clk = devm_clk_get(phy->u_phy.dev, "utmi-pads");
        if (IS_ERR(phy->pad_clk)) {
                pr_err("%s: can't get utmip pad clock\n", __func__);
                return PTR_ERR(phy->pad_clk);
        }

        return 0;
}

static void utmip_pad_power_on(struct tegra_usb_phy *phy)
{
        unsigned long val, flags;
        void __iomem *base = phy->pad_regs;

        clk_prepare_enable(phy->pad_clk);

        spin_lock_irqsave(&utmip_pad_lock, flags);

        if (utmip_pad_count++ == 0) {
                val = readl(base + UTMIP_BIAS_CFG0);
                val &= ~(UTMIP_OTGPD | UTMIP_BIASPD);
                writel(val, base + UTMIP_BIAS_CFG0);
        }

        spin_unlock_irqrestore(&utmip_pad_lock, flags);

        clk_disable_unprepare(phy->pad_clk);
}

static int utmip_pad_power_off(struct tegra_usb_phy *phy)
{
        unsigned long val, flags;
        void __iomem *base = phy->pad_regs;

        if (!utmip_pad_count) {
                pr_err("%s: utmip pad already powered off\n", __func__);
                return -EINVAL;
        }

        clk_prepare_enable(phy->pad_clk);

        spin_lock_irqsave(&utmip_pad_lock, flags);

        if (--utmip_pad_count == 0) {
                val = readl(base + UTMIP_BIAS_CFG0);
                val |= UTMIP_OTGPD | UTMIP_BIASPD;
                writel(val, base + UTMIP_BIAS_CFG0);
        }

        spin_unlock_irqrestore(&utmip_pad_lock, flags);

        clk_disable_unprepare(phy->pad_clk);

        return 0;
}

static int utmi_wait_register(void __iomem *reg, u32 mask, u32 result)
{
        unsigned long timeout = 2000;
        do {
                if ((readl(reg) & mask) == result)
                        return 0;
                udelay(1);
                timeout--;
        } while (timeout);
        return -1;
}

static void utmi_phy_clk_disable(struct tegra_usb_phy *phy)
{
        unsigned long val;
        void __iomem *base = phy->regs;

        if (phy->is_legacy_phy) {
                val = readl(base + USB_SUSP_CTRL);
                val |= USB_SUSP_SET;
                writel(val, base + USB_SUSP_CTRL);

                udelay(10);

                val = readl(base + USB_SUSP_CTRL);
                val &= ~USB_SUSP_SET;
                writel(val, base + USB_SUSP_CTRL);
        } else
                set_phcd(phy, true);

        if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID, 0) < 0)
                pr_err("%s: timeout waiting for phy to stabilize\n", __func__);
}

static void utmi_phy_clk_enable(struct tegra_usb_phy *phy)
{
        unsigned long val;
        void __iomem *base = phy->regs;

        if (phy->is_legacy_phy) {
                val = readl(base + USB_SUSP_CTRL);
                val |= USB_SUSP_CLR;
                writel(val, base + USB_SUSP_CTRL);

                udelay(10);

                val = readl(base + USB_SUSP_CTRL);
                val &= ~USB_SUSP_CLR;
                writel(val, base + USB_SUSP_CTRL);
        } else
                set_phcd(phy, false);

        if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID,
                                                     USB_PHY_CLK_VALID))
                pr_err("%s: timeout waiting for phy to stabilize\n", __func__);
}

static int utmi_phy_power_on(struct tegra_usb_phy *phy)
{
        unsigned long val;
        void __iomem *base = phy->regs;
        struct tegra_utmip_config *config = phy->config;

        val = readl(base + USB_SUSP_CTRL);
        val |= UTMIP_RESET;
        writel(val, base + USB_SUSP_CTRL);

        if (phy->is_legacy_phy) {
                val = readl(base + USB1_LEGACY_CTRL);
                val |= USB1_NO_LEGACY_MODE;
                writel(val, base + USB1_LEGACY_CTRL);
        }

        val = readl(base + UTMIP_TX_CFG0);
        val |= UTMIP_FS_PREABMLE_J;
        writel(val, base + UTMIP_TX_CFG0);

        val = readl(base + UTMIP_HSRX_CFG0);
        val &= ~(UTMIP_IDLE_WAIT(~0) | UTMIP_ELASTIC_LIMIT(~0));
        val |= UTMIP_IDLE_WAIT(config->idle_wait_delay);
        val |= UTMIP_ELASTIC_LIMIT(config->elastic_limit);
        writel(val, base + UTMIP_HSRX_CFG0);

        val = readl(base + UTMIP_HSRX_CFG1);
        val &= ~UTMIP_HS_SYNC_START_DLY(~0);
        val |= UTMIP_HS_SYNC_START_DLY(config->hssync_start_delay);
        writel(val, base + UTMIP_HSRX_CFG1);

        val = readl(base + UTMIP_DEBOUNCE_CFG0);
        val &= ~UTMIP_BIAS_DEBOUNCE_A(~0);
        val |= UTMIP_BIAS_DEBOUNCE_A(phy->freq->debounce);
        writel(val, base + UTMIP_DEBOUNCE_CFG0);

        val = readl(base + UTMIP_MISC_CFG0);
        val &= ~UTMIP_SUSPEND_EXIT_ON_EDGE;
        writel(val, base + UTMIP_MISC_CFG0);

        val = readl(base + UTMIP_MISC_CFG1);
        val &= ~(UTMIP_PLL_ACTIVE_DLY_COUNT(~0) | UTMIP_PLLU_STABLE_COUNT(~0));
        val |= UTMIP_PLL_ACTIVE_DLY_COUNT(phy->freq->active_delay) |
                UTMIP_PLLU_STABLE_COUNT(phy->freq->stable_count);
        writel(val, base + UTMIP_MISC_CFG1);

        val = readl(base + UTMIP_PLL_CFG1);
        val &= ~(UTMIP_XTAL_FREQ_COUNT(~0) | UTMIP_PLLU_ENABLE_DLY_COUNT(~0));
        val |= UTMIP_XTAL_FREQ_COUNT(phy->freq->xtal_freq_count) |
                UTMIP_PLLU_ENABLE_DLY_COUNT(phy->freq->enable_delay);
        writel(val, base + UTMIP_PLL_CFG1);

        if (phy->mode == USB_DR_MODE_PERIPHERAL) {
                val = readl(base + USB_SUSP_CTRL);
                val &= ~(USB_WAKE_ON_CNNT_EN_DEV | USB_WAKE_ON_DISCON_EN_DEV);
                writel(val, base + USB_SUSP_CTRL);

                val = readl(base + UTMIP_BAT_CHRG_CFG0);
                val &= ~UTMIP_PD_CHRG;
                writel(val, base + UTMIP_BAT_CHRG_CFG0);
        } else {
                val = readl(base + UTMIP_BAT_CHRG_CFG0);
                val |= UTMIP_PD_CHRG;
                writel(val, base + UTMIP_BAT_CHRG_CFG0);
        }

        utmip_pad_power_on(phy);

        val = readl(base + UTMIP_XCVR_CFG0);
        val &= ~(UTMIP_FORCE_PD_POWERDOWN | UTMIP_FORCE_PD2_POWERDOWN |
                 UTMIP_FORCE_PDZI_POWERDOWN | UTMIP_XCVR_LSBIAS_SEL |
                 UTMIP_XCVR_SETUP(~0) | UTMIP_XCVR_SETUP_MSB(~0) |
                 UTMIP_XCVR_LSFSLEW(~0) | UTMIP_XCVR_LSRSLEW(~0) |
                 UTMIP_XCVR_HSSLEW_MSB(~0));
        val |= UTMIP_XCVR_SETUP(config->xcvr_setup);
        val |= UTMIP_XCVR_SETUP_MSB(config->xcvr_setup);
        val |= UTMIP_XCVR_LSFSLEW(config->xcvr_lsfslew);
        val |= UTMIP_XCVR_LSRSLEW(config->xcvr_lsrslew);
        writel(val, base + UTMIP_XCVR_CFG0);

        val = readl(base + UTMIP_XCVR_CFG1);
        val &= ~(UTMIP_FORCE_PDDISC_POWERDOWN | UTMIP_FORCE_PDCHRP_POWERDOWN |
                 UTMIP_FORCE_PDDR_POWERDOWN | UTMIP_XCVR_TERM_RANGE_ADJ(~0));
        val |= UTMIP_XCVR_TERM_RANGE_ADJ(config->term_range_adj);
        writel(val, base + UTMIP_XCVR_CFG1);

        val = readl(base + UTMIP_BIAS_CFG1);
        val &= ~UTMIP_BIAS_PDTRK_COUNT(~0);
        val |= UTMIP_BIAS_PDTRK_COUNT(0x5);
        writel(val, base + UTMIP_BIAS_CFG1);

        if (phy->is_legacy_phy) {
                val = readl(base + UTMIP_SPARE_CFG0);
                if (phy->mode == USB_DR_MODE_PERIPHERAL)
                        val &= ~FUSE_SETUP_SEL;
                else
                        val |= FUSE_SETUP_SEL;
                writel(val, base + UTMIP_SPARE_CFG0);
        } else {
                val = readl(base + USB_SUSP_CTRL);
                val |= UTMIP_PHY_ENABLE;
                writel(val, base + USB_SUSP_CTRL);
        }

        val = readl(base + USB_SUSP_CTRL);
        val &= ~UTMIP_RESET;
        writel(val, base + USB_SUSP_CTRL);

        if (phy->is_legacy_phy) {
                val = readl(base + USB1_LEGACY_CTRL);
                val &= ~USB1_VBUS_SENSE_CTL_MASK;
                val |= USB1_VBUS_SENSE_CTL_A_SESS_VLD;
                writel(val, base + USB1_LEGACY_CTRL);

                val = readl(base + USB_SUSP_CTRL);
                val &= ~USB_SUSP_SET;
                writel(val, base + USB_SUSP_CTRL);
        }

        utmi_phy_clk_enable(phy);

        if (!phy->is_legacy_phy)
                set_pts(phy, 0);

        return 0;
}

static int utmi_phy_power_off(struct tegra_usb_phy *phy)
{
        unsigned long val;
        void __iomem *base = phy->regs;

        utmi_phy_clk_disable(phy);

        if (phy->mode == USB_DR_MODE_PERIPHERAL) {
                val = readl(base + USB_SUSP_CTRL);
                val &= ~USB_WAKEUP_DEBOUNCE_COUNT(~0);
                val |= USB_WAKE_ON_CNNT_EN_DEV | USB_WAKEUP_DEBOUNCE_COUNT(5);
                writel(val, base + USB_SUSP_CTRL);
        }

        val = readl(base + USB_SUSP_CTRL);
        val |= UTMIP_RESET;
        writel(val, base + USB_SUSP_CTRL);

        val = readl(base + UTMIP_BAT_CHRG_CFG0);
        val |= UTMIP_PD_CHRG;
        writel(val, base + UTMIP_BAT_CHRG_CFG0);

        val = readl(base + UTMIP_XCVR_CFG0);
        val |= UTMIP_FORCE_PD_POWERDOWN | UTMIP_FORCE_PD2_POWERDOWN |
               UTMIP_FORCE_PDZI_POWERDOWN;
        writel(val, base + UTMIP_XCVR_CFG0);

        val = readl(base + UTMIP_XCVR_CFG1);
        val |= UTMIP_FORCE_PDDISC_POWERDOWN | UTMIP_FORCE_PDCHRP_POWERDOWN |
               UTMIP_FORCE_PDDR_POWERDOWN;
        writel(val, base + UTMIP_XCVR_CFG1);

        return utmip_pad_power_off(phy);
}

static void utmi_phy_preresume(struct tegra_usb_phy *phy)
{
        unsigned long val;
        void __iomem *base = phy->regs;

        val = readl(base + UTMIP_TX_CFG0);
        val |= UTMIP_HS_DISCON_DISABLE;
        writel(val, base + UTMIP_TX_CFG0);
}

static void utmi_phy_postresume(struct tegra_usb_phy *phy)
{
        unsigned long val;
        void __iomem *base = phy->regs;

        val = readl(base + UTMIP_TX_CFG0);
        val &= ~UTMIP_HS_DISCON_DISABLE;
        writel(val, base + UTMIP_TX_CFG0);
}

static void utmi_phy_restore_start(struct tegra_usb_phy *phy,
                                   enum tegra_usb_phy_port_speed port_speed)
{
        unsigned long val;
        void __iomem *base = phy->regs;

        val = readl(base + UTMIP_MISC_CFG0);
        val &= ~UTMIP_DPDM_OBSERVE_SEL(~0);
        if (port_speed == TEGRA_USB_PHY_PORT_SPEED_LOW)
                val |= UTMIP_DPDM_OBSERVE_SEL_FS_K;
        else
                val |= UTMIP_DPDM_OBSERVE_SEL_FS_J;
        writel(val, base + UTMIP_MISC_CFG0);
        udelay(1);

        val = readl(base + UTMIP_MISC_CFG0);
        val |= UTMIP_DPDM_OBSERVE;
        writel(val, base + UTMIP_MISC_CFG0);
        udelay(10);
}

static void utmi_phy_restore_end(struct tegra_usb_phy *phy)
{
        unsigned long val;
        void __iomem *base = phy->regs;

        val = readl(base + UTMIP_MISC_CFG0);
        val &= ~UTMIP_DPDM_OBSERVE;
        writel(val, base + UTMIP_MISC_CFG0);
        udelay(10);
}

static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
{
        int ret;
        unsigned long val;
        void __iomem *base = phy->regs;

        ret = gpio_direction_output(phy->reset_gpio, 0);
        if (ret < 0) {
                dev_err(phy->u_phy.dev, "gpio %d not set to 0\n",
                        phy->reset_gpio);
                return ret;
        }
        msleep(5);
        ret = gpio_direction_output(phy->reset_gpio, 1);
        if (ret < 0) {
                dev_err(phy->u_phy.dev, "gpio %d not set to 1\n",
                        phy->reset_gpio);
                return ret;
        }

        clk_prepare_enable(phy->clk);
        msleep(1);

        val = readl(base + USB_SUSP_CTRL);
        val |= UHSIC_RESET;
        writel(val, base + USB_SUSP_CTRL);

        val = readl(base + ULPI_TIMING_CTRL_0);
        val |= ULPI_OUTPUT_PINMUX_BYP | ULPI_CLKOUT_PINMUX_BYP;
        writel(val, base + ULPI_TIMING_CTRL_0);

        val = readl(base + USB_SUSP_CTRL);
        val |= ULPI_PHY_ENABLE;
        writel(val, base + USB_SUSP_CTRL);

        val = 0;
        writel(val, base + ULPI_TIMING_CTRL_1);

        val |= ULPI_DATA_TRIMMER_SEL(4);
        val |= ULPI_STPDIRNXT_TRIMMER_SEL(4);
        val |= ULPI_DIR_TRIMMER_SEL(4);
        writel(val, base + ULPI_TIMING_CTRL_1);
        udelay(10);

        val |= ULPI_DATA_TRIMMER_LOAD;
        val |= ULPI_STPDIRNXT_TRIMMER_LOAD;
        val |= ULPI_DIR_TRIMMER_LOAD;
        writel(val, base + ULPI_TIMING_CTRL_1);

        /* Fix VbusInvalid due to floating VBUS */
        ret = usb_phy_io_write(phy->ulpi, 0x40, 0x08);
        if (ret) {
                pr_err("%s: ulpi write failed\n", __func__);
                return ret;
        }

        ret = usb_phy_io_write(phy->ulpi, 0x80, 0x0B);
        if (ret) {
                pr_err("%s: ulpi write failed\n", __func__);
                return ret;
        }

        val = readl(base + USB_SUSP_CTRL);
        val |= USB_SUSP_CLR;
        writel(val, base + USB_SUSP_CTRL);
        udelay(100);

        val = readl(base + USB_SUSP_CTRL);
        val &= ~USB_SUSP_CLR;
        writel(val, base + USB_SUSP_CTRL);

        return 0;
}

static int ulpi_phy_power_off(struct tegra_usb_phy *phy)
{
        clk_disable(phy->clk);
        return gpio_direction_output(phy->reset_gpio, 0);
}

static void tegra_usb_phy_close(struct usb_phy *x)
{
        struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);

        if (!IS_ERR(phy->vbus))
                regulator_disable(phy->vbus);

        clk_disable_unprepare(phy->pll_u);
}

static int tegra_usb_phy_power_on(struct tegra_usb_phy *phy)
{
        if (phy->is_ulpi_phy)
                return ulpi_phy_power_on(phy);
        else
                return utmi_phy_power_on(phy);
}

static int tegra_usb_phy_power_off(struct tegra_usb_phy *phy)
{
        if (phy->is_ulpi_phy)
                return ulpi_phy_power_off(phy);
        else
                return utmi_phy_power_off(phy);
}

static int      tegra_usb_phy_suspend(struct usb_phy *x, int suspend)
{
        struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);
        if (suspend)
                return tegra_usb_phy_power_off(phy);
        else
                return tegra_usb_phy_power_on(phy);
}

static int ulpi_open(struct tegra_usb_phy *phy)
{
        int err;

        phy->clk = devm_clk_get(phy->u_phy.dev, "ulpi-link");
        if (IS_ERR(phy->clk)) {
                pr_err("%s: can't get ulpi clock\n", __func__);
                return PTR_ERR(phy->clk);
        }

        err = devm_gpio_request(phy->u_phy.dev, phy->reset_gpio,
                "ulpi_phy_reset_b");
        if (err < 0) {
                dev_err(phy->u_phy.dev, "request failed for gpio: %d\n",
                       phy->reset_gpio);
                return err;
        }

        err = gpio_direction_output(phy->reset_gpio, 0);
        if (err < 0) {
                dev_err(phy->u_phy.dev, "gpio %d direction not set to output\n",
                       phy->reset_gpio);
                return err;
        }

        phy->ulpi = otg_ulpi_create(&ulpi_viewport_access_ops, 0);
        if (!phy->ulpi) {
                dev_err(phy->u_phy.dev, "otg_ulpi_create returned NULL\n");
                err = -ENOMEM;
                return err;
        }

        phy->ulpi->io_priv = phy->regs + ULPI_VIEWPORT;
        return 0;
}

static int tegra_usb_phy_init(struct tegra_usb_phy *phy)
{
        unsigned long parent_rate;
        int i;
        int err;

        phy->pll_u = devm_clk_get(phy->u_phy.dev, "pll_u");
        if (IS_ERR(phy->pll_u)) {
                pr_err("Can't get pll_u clock\n");
                return PTR_ERR(phy->pll_u);
        }

        err = clk_prepare_enable(phy->pll_u);
        if (err)
                return err;

        parent_rate = clk_get_rate(clk_get_parent(phy->pll_u));
        for (i = 0; i < ARRAY_SIZE(tegra_freq_table); i++) {
                if (tegra_freq_table[i].freq == parent_rate) {
                        phy->freq = &tegra_freq_table[i];
                        break;
                }
        }
        if (!phy->freq) {
                pr_err("invalid pll_u parent rate %ld\n", parent_rate);
                err = -EINVAL;
                goto fail;
        }

        if (!IS_ERR(phy->vbus)) {
                err = regulator_enable(phy->vbus);
                if (err) {
                        dev_err(phy->u_phy.dev,
                                "failed to enable usb vbus regulator: %d\n",
                                err);
                        goto fail;
                }
        }

        if (phy->is_ulpi_phy)
                err = ulpi_open(phy);
        else
                err = utmip_pad_open(phy);
        if (err < 0)
                goto fail;

        return 0;

fail:
        clk_disable_unprepare(phy->pll_u);
        return err;
}

void tegra_usb_phy_preresume(struct usb_phy *x)
{
        struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);

        if (!phy->is_ulpi_phy)
                utmi_phy_preresume(phy);
}
EXPORT_SYMBOL_GPL(tegra_usb_phy_preresume);

void tegra_usb_phy_postresume(struct usb_phy *x)
{
        struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);

        if (!phy->is_ulpi_phy)
                utmi_phy_postresume(phy);
}
EXPORT_SYMBOL_GPL(tegra_usb_phy_postresume);

void tegra_ehci_phy_restore_start(struct usb_phy *x,
                                 enum tegra_usb_phy_port_speed port_speed)
{
        struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);

        if (!phy->is_ulpi_phy)
                utmi_phy_restore_start(phy, port_speed);
}
EXPORT_SYMBOL_GPL(tegra_ehci_phy_restore_start);

void tegra_ehci_phy_restore_end(struct usb_phy *x)
{
        struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);

        if (!phy->is_ulpi_phy)
                utmi_phy_restore_end(phy);
}
EXPORT_SYMBOL_GPL(tegra_ehci_phy_restore_end);

static int read_utmi_param(struct platform_device *pdev, const char *param,
                           u8 *dest)
{
        u32 value;
        int err = of_property_read_u32(pdev->dev.of_node, param, &value);
        *dest = (u8)value;
        if (err < 0)
                dev_err(&pdev->dev, "Failed to read USB UTMI parameter %s: %d\n",
                        param, err);
        return err;
}

static int utmi_phy_probe(struct tegra_usb_phy *tegra_phy,
                          struct platform_device *pdev)
{
        struct resource *res;
        int err;
        struct tegra_utmip_config *config;

        tegra_phy->is_ulpi_phy = false;

        res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
        if (!res) {
                dev_err(&pdev->dev, "Failed to get UTMI Pad regs\n");
                return  -ENXIO;
        }

        tegra_phy->pad_regs = devm_ioremap(&pdev->dev, res->start,
                resource_size(res));
        if (!tegra_phy->regs) {
                dev_err(&pdev->dev, "Failed to remap UTMI Pad regs\n");
                return -ENOMEM;
        }

        tegra_phy->config = devm_kzalloc(&pdev->dev,
                sizeof(*tegra_phy->config), GFP_KERNEL);
        if (!tegra_phy->config) {
                dev_err(&pdev->dev,
                        "unable to allocate memory for USB UTMIP config\n");
                return -ENOMEM;
        }

        config = tegra_phy->config;

        err = read_utmi_param(pdev, "nvidia,hssync-start-delay",
                &config->hssync_start_delay);
        if (err < 0)
                return err;

        err = read_utmi_param(pdev, "nvidia,elastic-limit",
                &config->elastic_limit);
        if (err < 0)
                return err;

        err = read_utmi_param(pdev, "nvidia,idle-wait-delay",
                &config->idle_wait_delay);
        if (err < 0)
                return err;

        err = read_utmi_param(pdev, "nvidia,term-range-adj",
                &config->term_range_adj);
        if (err < 0)
                return err;

        err = read_utmi_param(pdev, "nvidia,xcvr-setup",
                &config->xcvr_setup);
        if (err < 0)
                return err;

        err = read_utmi_param(pdev, "nvidia,xcvr-lsfslew",
                &config->xcvr_lsfslew);
        if (err < 0)
                return err;

        err = read_utmi_param(pdev, "nvidia,xcvr-lsrslew",
                &config->xcvr_lsrslew);
        if (err < 0)
                return err;

        return 0;
}

static int tegra_usb_phy_probe(struct platform_device *pdev)
{
        struct resource *res;
        struct tegra_usb_phy *tegra_phy = NULL;
        struct device_node *np = pdev->dev.of_node;
        enum usb_phy_interface phy_type;
        int err;

        tegra_phy = devm_kzalloc(&pdev->dev, sizeof(*tegra_phy), GFP_KERNEL);
        if (!tegra_phy) {
                dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n");
                return -ENOMEM;
        }

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!res) {
                dev_err(&pdev->dev, "Failed to get I/O memory\n");
                return  -ENXIO;
        }

        tegra_phy->regs = devm_ioremap(&pdev->dev, res->start,
                resource_size(res));
        if (!tegra_phy->regs) {
                dev_err(&pdev->dev, "Failed to remap I/O memory\n");
                return -ENOMEM;
        }

        tegra_phy->is_legacy_phy =
                of_property_read_bool(np, "nvidia,has-legacy-mode");

        phy_type = of_usb_get_phy_mode(np);
        switch (phy_type) {
        case USBPHY_INTERFACE_MODE_UTMI:
                err = utmi_phy_probe(tegra_phy, pdev);
                if (err < 0)
                        return err;
                break;

        case USBPHY_INTERFACE_MODE_ULPI:
                tegra_phy->is_ulpi_phy = true;

                tegra_phy->reset_gpio =
                        of_get_named_gpio(np, "nvidia,phy-reset-gpio", 0);
                if (!gpio_is_valid(tegra_phy->reset_gpio)) {
                        dev_err(&pdev->dev, "invalid gpio: %d\n",
                                tegra_phy->reset_gpio);
                        return tegra_phy->reset_gpio;
                }
                tegra_phy->config = NULL;
                break;

        default:
                dev_err(&pdev->dev, "phy_type is invalid or unsupported\n");
                return -EINVAL;
        }

        if (of_find_property(np, "dr_mode", NULL))
                tegra_phy->mode = of_usb_get_dr_mode(np);
        else
                tegra_phy->mode = USB_DR_MODE_HOST;

        if (tegra_phy->mode == USB_DR_MODE_UNKNOWN) {
                dev_err(&pdev->dev, "dr_mode is invalid\n");
                return -EINVAL;
        }

        /* On some boards, the VBUS regulator doesn't need to be controlled */
        if (of_find_property(np, "vbus-supply", NULL)) {
                tegra_phy->vbus = devm_regulator_get(&pdev->dev, "vbus");
                if (IS_ERR(tegra_phy->vbus))
                        return PTR_ERR(tegra_phy->vbus);
        } else {
                dev_notice(&pdev->dev, "no vbus regulator");
                tegra_phy->vbus = ERR_PTR(-ENODEV);
        }

        tegra_phy->u_phy.dev = &pdev->dev;
        err = tegra_usb_phy_init(tegra_phy);
        if (err < 0)
                return err;

        tegra_phy->u_phy.shutdown = tegra_usb_phy_close;
        tegra_phy->u_phy.set_suspend = tegra_usb_phy_suspend;

        dev_set_drvdata(&pdev->dev, tegra_phy);

        err = usb_add_phy_dev(&tegra_phy->u_phy);
        if (err < 0) {
                tegra_usb_phy_close(&tegra_phy->u_phy);
                return err;
        }

        return 0;
}

static int tegra_usb_phy_remove(struct platform_device *pdev)
{
        struct tegra_usb_phy *tegra_phy = platform_get_drvdata(pdev);

        usb_remove_phy(&tegra_phy->u_phy);

        return 0;
}

static struct of_device_id tegra_usb_phy_id_table[] = {
        { .compatible = "nvidia,tegra20-usb-phy", },
        { },
};
MODULE_DEVICE_TABLE(of, tegra_usb_phy_id_table);

static struct platform_driver tegra_usb_phy_driver = {
        .probe          = tegra_usb_phy_probe,
        .remove         = tegra_usb_phy_remove,
        .driver         = {
                .name   = "tegra-phy",
                .owner  = THIS_MODULE,
                .of_match_table = of_match_ptr(tegra_usb_phy_id_table),
        },
};
module_platform_driver(tegra_usb_phy_driver);

MODULE_DESCRIPTION("Tegra USB PHY driver");
MODULE_LICENSE("GPL v2");