1 files changed, 53 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/omap_phy_internal.c b/arch/arm/mach-omap2/omap_phy_internal.c
new file mode 100644
index 0000000000..a1d001170a
--- /dev/null
+++ b/arch/arm/mach-omap2/omap_phy_internal.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * This file configures the internal USB PHY in OMAP4430. Used
+ * with TWL6030 transceiver and MUSB on OMAP4430.
+ *
+ * Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com
+ * Author: Hema HK <hemahk@ti.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/usb.h>
+#include <linux/usb/musb.h>
+
+#include "soc.h"
+#include "control.h"
+
+#define CONTROL_DEV_CONF		0x300
+#define PHY_PD				0x1
+
+/**
+ * omap4430_phy_power_down: disable MUSB PHY during early init
+ *
+ * OMAP4 MUSB PHY module is enabled by default on reset, but this will
+ * prevent core retention if not disabled by SW. USB driver will
+ * later on enable this, once and if the driver needs it.
+ */
+static int __init omap4430_phy_power_down(void)
+{
+	void __iomem *ctrl_base;
+
+	if (!cpu_is_omap44xx())
+		return 0;
+
+	ctrl_base = ioremap(OMAP443X_SCM_BASE, SZ_1K);
+	if (!ctrl_base) {
+		pr_err("control module ioremap failed\n");
+		return -ENOMEM;
+	}
+
+	/* Power down the phy */
+	writel_relaxed(PHY_PD, ctrl_base + CONTROL_DEV_CONF);
+
+	iounmap(ctrl_base);
+
+	return 0;
+}
+omap_early_initcall(omap4430_phy_power_down);