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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* This file configures the internal USB PHY in OMAP4430. Used
* with TWL6030 transceiver and MUSB on OMAP4430.
*
* Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com
* Author: Hema HK <hemahk@ti.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/usb.h>
#include <linux/usb/musb.h>
#include "soc.h"
#include "control.h"
#include "usb.h"
#define CONTROL_DEV_CONF 0x300
#define PHY_PD 0x1
/**
* omap4430_phy_power_down: disable MUSB PHY during early init
*
* OMAP4 MUSB PHY module is enabled by default on reset, but this will
* prevent core retention if not disabled by SW. USB driver will
* later on enable this, once and if the driver needs it.
*/
static int __init omap4430_phy_power_down(void)
{
void __iomem *ctrl_base;
if (!cpu_is_omap44xx())
return 0;
ctrl_base = ioremap(OMAP443X_SCM_BASE, SZ_1K);
if (!ctrl_base) {
pr_err("control module ioremap failed\n");
return -ENOMEM;
}
/* Power down the phy */
writel_relaxed(PHY_PD, ctrl_base + CONTROL_DEV_CONF);
iounmap(ctrl_base);
return 0;
}
omap_early_initcall(omap4430_phy_power_down);
void am35x_musb_reset(void)
{
u32 regval;
/* Reset the musb interface */
regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
regval |= AM35XX_USBOTGSS_SW_RST;
omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);
regval &= ~AM35XX_USBOTGSS_SW_RST;
omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);
regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
}
void am35x_musb_phy_power(u8 on)
{
unsigned long timeout = jiffies + msecs_to_jiffies(100);
u32 devconf2;
if (on) {
/*
* Start the on-chip PHY and its PLL.
*/
devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
devconf2 &= ~(CONF2_RESET | CONF2_PHYPWRDN | CONF2_OTGPWRDN);
devconf2 |= CONF2_PHY_PLLON;
omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
pr_info("Waiting for PHY clock good...\n");
while (!(omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2)
& CONF2_PHYCLKGD)) {
cpu_relax();
if (time_after(jiffies, timeout)) {
pr_err("musb PHY clock good timed out\n");
break;
}
}
} else {
/*
* Power down the on-chip PHY.
*/
devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
devconf2 &= ~CONF2_PHY_PLLON;
devconf2 |= CONF2_PHYPWRDN | CONF2_OTGPWRDN;
omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
}
}
void am35x_musb_clear_irq(void)
{
u32 regval;
regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
regval |= AM35XX_USBOTGSS_INT_CLR;
omap_ctrl_writel(regval, AM35XX_CONTROL_LVL_INTR_CLEAR);
regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
}
void am35x_set_mode(u8 musb_mode)
{
u32 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
devconf2 &= ~CONF2_OTGMODE;
switch (musb_mode) {
case MUSB_HOST: /* Force VBUS valid, ID = 0 */
devconf2 |= CONF2_FORCE_HOST;
break;
case MUSB_PERIPHERAL: /* Force VBUS valid, ID = 1 */
devconf2 |= CONF2_FORCE_DEVICE;
break;
case MUSB_OTG: /* Don't override the VBUS/ID comparators */
devconf2 |= CONF2_NO_OVERRIDE;
break;
default:
pr_info("Unsupported mode %u\n", musb_mode);
}
omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
}
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