1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * This file configures the internal USB PHY in OMAP4430. Used
4 * with TWL6030 transceiver and MUSB on OMAP4430.
5 *
6 * Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com
7 * Author: Hema HK <hemahk@ti.com>
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/types.h>
13#include <linux/delay.h>
14#include <linux/clk.h>
15#include <linux/io.h>
16#include <linux/err.h>
17#include <linux/usb.h>
18#include <linux/usb/musb.h>
19
20#include "soc.h"
21#include "control.h"
22
23#define CONTROL_DEV_CONF		0x300
24#define PHY_PD				0x1
25
26/**
27 * omap4430_phy_power_down: disable MUSB PHY during early init
28 *
29 * OMAP4 MUSB PHY module is enabled by default on reset, but this will
30 * prevent core retention if not disabled by SW. USB driver will
31 * later on enable this, once and if the driver needs it.
32 */
33static int __init omap4430_phy_power_down(void)
34{
35	void __iomem *ctrl_base;
36
37	if (!cpu_is_omap44xx())
38		return 0;
39
40	ctrl_base = ioremap(OMAP443X_SCM_BASE, SZ_1K);
41	if (!ctrl_base) {
42		pr_err("control module ioremap failed\n");
43		return -ENOMEM;
44	}
45
46	/* Power down the phy */
47	writel_relaxed(PHY_PD, ctrl_base + CONTROL_DEV_CONF);
48
49	iounmap(ctrl_base);
50
51	return 0;
52}
53omap_early_initcall(omap4430_phy_power_down);
54