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/*
* 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"
struct usb_dpll_params {
u16 m;
u8 n;
u8 freq:3;
u8 sd;
u32 mf;
};
#define NUM_USB_CLKS 6
static struct usb_dpll_params omap_usb3_dpll_params[NUM_USB_CLKS] = {
{1250, 5, 4, 20, 0}, /* 12 MHz */
{3125, 20, 4, 20, 0}, /* 16.8 MHz */
{1172, 8, 4, 20, 65537}, /* 19.2 MHz */
{1250, 12, 4, 20, 0}, /* 26 MHz */
{3125, 47, 4, 20, 92843}, /* 38.4 MHz */
{1000, 7, 4, 10, 0}, /* 20 MHz */
};
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)
{
u32 clk_index = get_sys_clk_index();
u32 val;
val = readl(&phy_regs->pll_config_1);
val &= ~PLL_REGN_MASK;
val |= omap_usb3_dpll_params[clk_index].n << PLL_REGN_SHIFT;
writel(val, &phy_regs->pll_config_1);
val = readl(&phy_regs->pll_config_2);
val &= ~PLL_SELFREQDCO_MASK;
val |= omap_usb3_dpll_params[clk_index].freq << PLL_SELFREQDCO_SHIFT;
writel(val, &phy_regs->pll_config_2);
val = readl(&phy_regs->pll_config_1);
val &= ~PLL_REGM_MASK;
val |= omap_usb3_dpll_params[clk_index].m << PLL_REGM_SHIFT;
writel(val, &phy_regs->pll_config_1);
val = readl(&phy_regs->pll_config_4);
val &= ~PLL_REGM_F_MASK;
val |= omap_usb3_dpll_params[clk_index].mf << PLL_REGM_F_SHIFT;
writel(val, &phy_regs->pll_config_4);
val = readl(&phy_regs->pll_config_3);
val &= ~PLL_SD_MASK;
val |= omap_usb3_dpll_params[clk_index].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 usb3_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);
usb3_phy_power(1);
}
void omap_enable_phy_clocks(struct omap_xhci *omap)
{
u32 val;
/* Setting OCP2SCP1 register */
setbits_le32((*prcm)->cm_l3init_ocp2scp1_clkctrl,
OCP2SCP1_CLKCTRL_MODULEMODE_HW);
/* Turn on 32K AON clk */
setbits_le32((*prcm)->cm_coreaon_usb_phy_core_clkctrl,
USBPHY_CORE_CLKCTRL_OPTFCLKEN_CLK32K);
/* Setting CM_L3INIT_CLKSTCTRL to 0x0 i.e NO sleep */
writel(0x0, (*prcm)->cm_l3init_clkstctrl);
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);
/* Enable the USB OTG Super speed clocks */
val = (OPTFCLKEN_REFCLK960M | OTG_SS_CLKCTRL_MODULEMODE_HW);
setbits_le32((*prcm)->cm_l3init_usb_otg_ss_clkctrl, val);
};
void omap_reset_usb_phy(struct dwc3 *dwc3_reg)
{
/* Assert USB3 PHY reset */
setbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
/* Assert USB2 PHY reset */
setbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
mdelay(100);
/* Clear USB3 PHY reset */
clrbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
/* Clear USB2 PHY reset */
clrbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
}
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