54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
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// 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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#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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