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