OMAP3: am35x: add musb functions

AM35XX specific functions for integrated USB PHY/MUSB IP.

Signed-off-by: Ilya Yanok <ilya.yanok@cogentembedded.com>

3 files changed, 104 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/omap3/Makefile b/arch/arm/cpu/armv7/omap3/Makefile
index ac597be..de167ee 100644
--- a/arch/arm/cpu/armv7/omap3/Makefile
+++ b/arch/arm/cpu/armv7/omap3/Makefile
@@ -38,6 +38,7 @@ endif
 COBJS-$(CONFIG_DRIVER_TI_EMAC)	+= emac.o
 COBJS-$(CONFIG_EMIF4)	+= emif4.o
 COBJS-$(CONFIG_SDRC)	+= sdrc.o
+COBJS-$(CONFIG_USB_MUSB_AM35X)	+= am35x_musb.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS) $(COBJS-y) $(SOBJS))
diff --git a/arch/arm/cpu/armv7/omap3/am35x_musb.c b/arch/arm/cpu/armv7/omap3/am35x_musb.c
new file mode 100644
index 0000000..7183c4f
--- /dev/null
+++ b/arch/arm/cpu/armv7/omap3/am35x_musb.c
@@ -0,0 +1,75 @@
+/*
+ * This file configures the internal USB PHY in AM35X.
+ *
+ * Copyright (C) 2012 Ilya Yanok <ilya.yanok@gmail.com>
+ *
+ * Based on omap_phy_internal.c code from Linux by
+ * Hema HK <hemahk@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ *
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/am35x_def.h>
+
+void am35x_musb_reset(void)
+{
+	/* Reset the musb interface */
+	clrsetbits_le32(&am35x_scm_general_regs->ip_sw_reset,
+			0, USBOTGSS_SW_RST);
+	clrsetbits_le32(&am35x_scm_general_regs->ip_sw_reset,
+			USBOTGSS_SW_RST, 0);
+}
+
+void am35x_musb_phy_power(u8 on)
+{
+	unsigned long start = get_timer(0);
+
+	if (on) {
+		/*
+		 * Start the on-chip PHY and its PLL.
+		 */
+		clrsetbits_le32(&am35x_scm_general_regs->devconf2,
+				CONF2_RESET | CONF2_PHYPWRDN | CONF2_OTGPWRDN,
+				CONF2_PHY_PLLON);
+
+		debug("Waiting for PHY clock good...\n");
+		while (!(readl(&am35x_scm_general_regs->devconf2)
+				& CONF2_PHYCLKGD)) {
+
+			if (get_timer(start) > CONFIG_SYS_HZ / 10) {
+				printf("musb PHY clock good timed out\n");
+				break;
+			}
+		}
+	} else {
+		/*
+		 * Power down the on-chip PHY.
+		 */
+		clrsetbits_le32(&am35x_scm_general_regs->devconf2,
+				CONF2_PHY_PLLON,
+				CONF2_PHYPWRDN | CONF2_OTGPWRDN);
+	}
+}
+
+void am35x_musb_clear_irq(void)
+{
+	clrsetbits_le32(&am35x_scm_general_regs->lvl_intr_clr,
+			0, USBOTGSS_INT_CLR);
+	readl(&am35x_scm_general_regs->lvl_intr_clr);
+}
+
diff --git a/arch/arm/include/asm/arch-omap3/musb.h b/arch/arm/include/asm/arch-omap3/musb.h
new file mode 100644
index 0000000..423ac50
--- /dev/null
+++ b/arch/arm/include/asm/arch-omap3/musb.h
@@ -0,0 +1,28 @@
+/*
+ * (C) Copyright 2012
+ * Ilya Yanok, <ilya.yanok@gmail.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ */
+
+#ifndef __ASM_ARCH_OMAP3_MUSB_H
+#define __ASM_ARCH_OMAP3_MUSB_H
+extern void am35x_musb_reset(void);
+extern void am35x_musb_phy_power(u8 on);
+extern void am35x_musb_clear_irq(void);
+#endif