/*
 * OMAP USB PHY Support
 *
 * (C) Copyright 2013
 * Texas Instruments, <www.ti.com>
 *
 * Author: Dan Murphy <dmurphy@ti.com>
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <usb.h>
#include <asm-generic/errno.h>
#include <asm/omap_common.h>
#include <asm/arch/cpu.h>
#include <asm/arch/sys_proto.h>

#include <linux/compat.h>
#include <linux/usb/dwc3.h>
#include <linux/usb/xhci-omap.h>

#include "../host/xhci.h"

#ifdef CONFIG_OMAP_USB3PHY1_HOST
struct usb3_dpll_params {
        u16     m;
        u8      n;
        u8      freq:3;
        u8      sd;
        u32     mf;
};

struct usb3_dpll_map {
        unsigned long rate;
        struct usb3_dpll_params params;
        struct usb3_dpll_map *dpll_map;
};

static struct usb3_dpll_map dpll_map_usb[] = {
        {12000000, {1250, 5, 4, 20, 0} },       /* 12 MHz */
        {16800000, {3125, 20, 4, 20, 0} },      /* 16.8 MHz */
        {19200000, {1172, 8, 4, 20, 65537} },   /* 19.2 MHz */
        {20000000, {1000, 7, 4, 10, 0} },       /* 20 MHz */
        {26000000, {1250, 12, 4, 20, 0} },      /* 26 MHz */
        {38400000, {3125, 47, 4, 20, 92843} },  /* 38.4 MHz */
        { },                                    /* Terminator */
};

static struct usb3_dpll_params *omap_usb3_get_dpll_params(void)
{
        unsigned long rate;
        struct usb3_dpll_map *dpll_map = dpll_map_usb;

        rate = get_sys_clk_freq();

        for (; dpll_map->rate; dpll_map++) {
                if (rate == dpll_map->rate)
                        return &dpll_map->params;
        }

        dev_err(phy->dev, "No DPLL configuration for %lu Hz SYS CLK\n", rate);

        return NULL;
}

static void omap_usb_dpll_relock(struct omap_usb3_phy *phy_regs)
{
        u32 val;

        writel(SET_PLL_GO, &phy_regs->pll_go);
        do {
                val = readl(&phy_regs->pll_status);
                        if (val & PLL_LOCK)
                                break;
        } while (1);
}

static void omap_usb_dpll_lock(struct omap_usb3_phy *phy_regs)
{
        struct usb3_dpll_params *dpll_params;
        u32 val;

        dpll_params = omap_usb3_get_dpll_params();
        if (!dpll_params)
                return;

        val = readl(&phy_regs->pll_config_1);
        val &= ~PLL_REGN_MASK;
        val |= dpll_params->n << PLL_REGN_SHIFT;
        writel(val, &phy_regs->pll_config_1);

        val = readl(&phy_regs->pll_config_2);
        val &= ~PLL_SELFREQDCO_MASK;
        val |= dpll_params->freq << PLL_SELFREQDCO_SHIFT;
        writel(val, &phy_regs->pll_config_2);

        val = readl(&phy_regs->pll_config_1);
        val &= ~PLL_REGM_MASK;
        val |= dpll_params->m << PLL_REGM_SHIFT;
        writel(val, &phy_regs->pll_config_1);

        val = readl(&phy_regs->pll_config_4);
        val &= ~PLL_REGM_F_MASK;
        val |= dpll_params->mf << PLL_REGM_F_SHIFT;
        writel(val, &phy_regs->pll_config_4);

        val = readl(&phy_regs->pll_config_3);
        val &= ~PLL_SD_MASK;
        val |= dpll_params->sd << PLL_SD_SHIFT;
        writel(val, &phy_regs->pll_config_3);

        omap_usb_dpll_relock(phy_regs);
}

static void usb3_phy_partial_powerup(struct omap_usb3_phy *phy_regs)
{
        u32 rate = get_sys_clk_freq()/1000000;
        u32 val;

        val = readl((*ctrl)->control_phy_power_usb);
        val &= ~(USB3_PWRCTL_CLK_CMD_MASK | USB3_PWRCTL_CLK_FREQ_MASK);
        val |= (USB3_PHY_PARTIAL_RX_POWERON | USB3_PHY_TX_RX_POWERON);
        val |= rate << USB3_PWRCTL_CLK_FREQ_SHIFT;

        writel(val, (*ctrl)->control_phy_power_usb);
}

void usb_phy_power(int on)
{
        u32 val;

        val = readl((*ctrl)->control_phy_power_usb);
        if (on) {
                val &= ~USB3_PWRCTL_CLK_CMD_MASK;
                val |= USB3_PHY_TX_RX_POWERON;
        } else {
                val &= (~USB3_PWRCTL_CLK_CMD_MASK & ~USB3_PHY_TX_RX_POWERON);
        }

        writel(val, (*ctrl)->control_phy_power_usb);
}

void omap_usb3_phy_init(struct omap_usb3_phy *phy_regs)
{
        omap_usb_dpll_lock(phy_regs);
        usb3_phy_partial_powerup(phy_regs);
        /*
         * Give enough time for the PHY to partially power-up before
         * powering it up completely. delay value suggested by the HW
         * team.
         */
        mdelay(100);
}

static void omap_enable_usb3_phy(struct omap_xhci *omap)
{
        u32     val;

        val = (USBOTGSS_DMADISABLE |
                        USBOTGSS_STANDBYMODE_SMRT_WKUP |
                        USBOTGSS_IDLEMODE_NOIDLE);
        writel(val, &omap->otg_wrapper->sysconfig);

        /* Clear the utmi OTG status */
        val = readl(&omap->otg_wrapper->utmi_otg_status);
        writel(val, &omap->otg_wrapper->utmi_otg_status);

        /* Enable interrupts */
        writel(USBOTGSS_COREIRQ_EN, &omap->otg_wrapper->irqenable_set_0);
        val = (USBOTGSS_IRQ_SET_1_IDPULLUP_FALL_EN |
                        USBOTGSS_IRQ_SET_1_DISCHRGVBUS_FALL_EN |
                        USBOTGSS_IRQ_SET_1_CHRGVBUS_FALL_EN     |
                        USBOTGSS_IRQ_SET_1_DRVVBUS_FALL_EN      |
                        USBOTGSS_IRQ_SET_1_IDPULLUP_RISE_EN     |
                        USBOTGSS_IRQ_SET_1_DISCHRGVBUS_RISE_EN  |
                        USBOTGSS_IRQ_SET_1_CHRGVBUS_RISE_EN |
                        USBOTGSS_IRQ_SET_1_DRVVBUS_RISE_EN |
                        USBOTGSS_IRQ_SET_1_OEVT_EN);
        writel(val, &omap->otg_wrapper->irqenable_set_1);

        /* Clear the IRQ status */
        val = readl(&omap->otg_wrapper->irqstatus_1);
        writel(val, &omap->otg_wrapper->irqstatus_1);
        val = readl(&omap->otg_wrapper->irqstatus_0);
        writel(val, &omap->otg_wrapper->irqstatus_0);
};
#endif /* CONFIG_OMAP_USB3PHY1_HOST */

#ifdef CONFIG_OMAP_USB2PHY2_HOST
static void omap_enable_usb2_phy2(struct omap_xhci *omap)
{
        u32 reg, val;

        val = (~USB2PHY_AUTORESUME_EN & USB2PHY_DISCHGDET);
        writel(val, (*ctrl)->control_srcomp_north_side);

        setbits_le32((*prcm)->cm_coreaon_usb_phy2_core_clkctrl,
                        USBPHY_CORE_CLKCTRL_OPTFCLKEN_CLK32K);

        setbits_le32((*prcm)->cm_l3init_hsusbhost_clkctrl,
                                        (USBPHY_CORE_CLKCTRL_OPTFCLKEN_CLK32K |
                                         OTG_SS_CLKCTRL_MODULEMODE_HW));

        /* This is an undocumented Reserved register */
        reg = 0x4a0086c0;
        val = readl(reg);
        val |= 0x100;
        setbits_le32(reg, val);
}

void usb_phy_power(int on)
{
        return;
}
#endif /* CONFIG_OMAP_USB2PHY2_HOST */

#ifdef CONFIG_AM437X_USB2PHY2_HOST
static void am437x_enable_usb2_phy2(struct omap_xhci *omap)
{
        const u32 usb_otg_ss_clk_val = (USBOTGSSX_CLKCTRL_MODULE_EN |
                                USBOTGSSX_CLKCTRL_OPTFCLKEN_REFCLK960);

        writel(usb_otg_ss_clk_val, PRM_PER_USB_OTG_SS0_CLKCTRL);
        writel(usb_otg_ss_clk_val, PRM_PER_USB_OTG_SS1_CLKCTRL);

        writel(USBPHYOCPSCP_MODULE_EN, PRM_PER_USBPHYOCP2SCP0_CLKCTRL);
        writel(USBPHYOCPSCP_MODULE_EN, PRM_PER_USBPHYOCP2SCP1_CLKCTRL);
}

void usb_phy_power(int on)
{
        u32 val;

        /* USB1_CTRL */
        val = readl(USB1_CTRL);
        if (on) {
                /*
                 * these bits are re-used on AM437x to power up/down the USB
                 * CM and OTG PHYs, if we don't toggle them, USB will not be
                 * functional on newer silicon revisions
                 */
                val &= ~(USB1_CTRL_CM_PWRDN | USB1_CTRL_OTG_PWRDN);
        } else {
                val |= USB1_CTRL_CM_PWRDN | USB1_CTRL_OTG_PWRDN;
        }

        writel(val, USB1_CTRL);
}
#endif /* CONFIG_AM437X_USB2PHY2_HOST */

void omap_enable_phy(struct omap_xhci *omap)
{
#ifdef CONFIG_OMAP_USB2PHY2_HOST
        omap_enable_usb2_phy2(omap);
#endif

#ifdef CONFIG_AM437X_USB2PHY2_HOST
        am437x_enable_usb2_phy2(omap);
#endif

#ifdef CONFIG_OMAP_USB3PHY1_HOST
        omap_enable_usb3_phy(omap);
        omap_usb3_phy_init(omap->usb3_phy);
#endif
}