arch/arm/mach-omap2/omap_phy_internal.c

   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);