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/*
* TI's Davinci platform specific USB wrapper functions.
*
* Copyright (c) 2008 Texas Instruments
*
* 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., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* Author: Thomas Abraham t-abraham@ti.com, Texas Instruments
*/
#include <common.h>
#include <asm/io.h>
#include "davinci.h"
/* MUSB platform configuration */
struct musb_config musb_cfg = {
(struct musb_regs *)MENTOR_USB0_BASE,
DAVINCI_USB_TIMEOUT,
0
};
/* MUSB module register overlay */
struct davinci_usb_regs *dregs;
/*
* Enable the USB phy
*/
static u8 phy_on(void)
{
u32 timeout;
/* Wait until the USB phy is turned on */
writel(USBPHY_SESNDEN | USBPHY_VBDTCTEN, USBPHY_CTL_PADDR);
timeout = musb_cfg.timeout;
while (timeout--)
if (readl(USBPHY_CTL_PADDR) & USBPHY_PHYCLKGD)
return 1;
/* USB phy was not turned on */
return 0;
}
/*
* Disable the USB phy
*/
static void phy_off(void)
{
/* powerdown the on-chip PHY and its oscillator */
writel(USBPHY_OSCPDWN | USBPHY_PHYPDWN, USBPHY_CTL_PADDR);
}
/*
* This function performs Davinci platform specific initialization for usb0.
*/
int musb_platform_init(void)
{
u32 revision;
/* enable USB VBUS */
enable_vbus();
/* start the on-chip USB phy and its pll */
if (!phy_on())
return -1;
/* reset the controller */
dregs = (struct davinci_usb_regs *)DAVINCI_USB0_BASE;
writel(1, &dregs->ctrlr);
udelay(5000);
/* Returns zero if e.g. not clocked */
revision = readl(&dregs->version);
if (!revision)
return -1;
/* Disable all interrupts */
writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_RXINT_MASK |
DAVINCI_USB_TXINT_MASK , &dregs->intmsksetr);
return 0;
}
/*
* This function performs Davinci platform specific deinitialization for usb0.
*/
void musb_platform_deinit(void)
{
/* Turn of the phy */
phy_off();
/* flush any interrupts */
writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_TXINT_MASK |
DAVINCI_USB_RXINT_MASK , &dregs->intclrr);
}
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