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 */
33 static 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 }
53 omap_early_initcall(omap4430_phy_power_down);
54
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