| 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, size: 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(addr: ctrl_base); |
| 50 | |
| 51 | return 0; |
| 52 | } |
| 53 | omap_early_initcall(omap4430_phy_power_down); |
| 54 |