OMAP3: am35x: add musb functions

AM35XX specific functions for integrated USB PHY/MUSB IP.

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

diff --git a/arch/arm/cpu/armv7/omap3/Makefile b/arch/arm/cpu/armv7/omap3/Makefile
index ac597be25aaebe8557057d86e7b8cd483ce0dade..de167eea56f5c43eb02a06cb3d3e98826672d3fc 100644 (file)
--- 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 (file)
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 (file)
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