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e142e9f35f
Adding DM6446 (TI DaVinci) platform specific USB functionality for USB Phy and VBUS initialization. Signed-off-by: Ravi Babu <ravibabu@ti.com> Signed-off-by: Swaminathan S <swami.iyer@ti.com> Signed-off-by: Thomas Abraham <t-abraham@ti.com> Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com> Signed-off-by: Remy Bohmer <linux@bohmer.net>
106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
/*
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* TI's Davinci platform specific USB wrapper functions.
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*
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* Copyright (c) 2008 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* Author: Thomas Abraham t-abraham@ti.com, Texas Instruments
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*/
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#include <common.h>
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#include <asm/io.h>
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#include "davinci_usb.h"
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/* MUSB platform configuration */
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struct musb_config musb_cfg = {
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(struct musb_regs *)MENTOR_USB0_BASE,
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DAVINCI_USB_TIMEOUT,
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0
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};
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/* MUSB module register overlay */
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struct davinci_usb_regs *dregs;
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/*
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* Enable the USB phy
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*/
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static u8 phy_on(void)
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{
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u32 timeout;
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/* Wait until the USB phy is turned on */
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writel(USBPHY_SESNDEN | USBPHY_VBDTCTEN, USBPHY_CTL_PADDR);
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timeout = musb_cfg.timeout;
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while (timeout--)
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if (readl(USBPHY_CTL_PADDR) & USBPHY_PHYCLKGD)
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return 1;
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/* USB phy was not turned on */
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return 0;
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}
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/*
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* Disable the USB phy
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*/
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static void phy_off(void)
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{
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/* powerdown the on-chip PHY and its oscillator */
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writel(USBPHY_OSCPDWN | USBPHY_PHYPDWN, USBPHY_CTL_PADDR);
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}
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/*
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* This function performs Davinci platform specific initialization for usb0.
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*/
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int musb_platform_init(void)
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{
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u32 revision;
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/* enable USB VBUS */
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enable_vbus();
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/* start the on-chip USB phy and its pll */
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if (!phy_on())
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return -1;
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/* reset the controller */
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dregs = (struct davinci_usb_regs *)DAVINCI_USB0_BASE;
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writel(1, &dregs->ctrlr);
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udelay(5000);
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/* Returns zero if e.g. not clocked */
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revision = readl(&dregs->version);
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if (!revision)
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return -1;
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/* Disable all interrupts */
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writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_RXINT_MASK |
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DAVINCI_USB_TXINT_MASK , &dregs->intmsksetr);
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return 0;
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}
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/*
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* This function performs Davinci platform specific deinitialization for usb0.
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*/
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void musb_platform_deinit(void)
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{
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/* Turn of the phy */
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phy_off();
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/* flush any interrupts */
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writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_TXINT_MASK |
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DAVINCI_USB_RXINT_MASK , &dregs->intclrr);
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}
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