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OMAP3: am35x: add musb functions

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AM35XX specific functions for integrated USB PHY/MUSB IP.

Signed-off-by: Ilya Yanok <ilya.yanok@cogentembedded.com>
This commit is contained in:
Ilya Yanok 2012-11-06 13:48:27 +00:00 • committed by Marek Vasut
parent 272165f6a9
commit 08fc71711a
3 changed files with 104 additions and 0 deletions
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1
arch/arm/cpu/armv7/omap3/Makefile
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@ -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))

75
arch/arm/cpu/armv7/omap3/am35x_musb.c Normal file
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@ -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);
}

28
arch/arm/include/asm/arch-omap3/musb.h Normal file
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@ -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