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https://github.com/AsahiLinux/u-boot
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bbf4c01efc
Changed musb_config initialization for omap3.c, davinci.c and da8xx.c using name of structure fields. This would cause the uninitialized field to be null by default and thus would help in avoiding to init some flags required to be set only for a few selected platforms. CC: Remy Bohmer <linux@bohmer.net> Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
/*
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* da8xx.c - TI's DA8xx platform specific usb wrapper functions.
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*
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* Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
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*
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* Based on drivers/usb/musb/davinci.c
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*
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* Copyright (C) 2009 Texas Instruments Incorporated
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <common.h>
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#include "da8xx.h"
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/* MUSB platform configuration */
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struct musb_config musb_cfg = {
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.regs = (struct musb_regs *)DA8XX_USB_OTG_CORE_BASE,
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.timeout = DA8XX_USB_OTG_TIMEOUT,
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.musb_speed = 0,
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};
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/*
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* This function enables VBUS by driving the GPIO Bank4 Pin 15 high.
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*/
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static void enable_vbus(void)
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{
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u32 value;
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/* configure GPIO bank4 pin 15 in output direction */
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value = readl(&davinci_gpio_bank45->dir);
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writel((value & (~DA8XX_USB_VBUS_GPIO)), &davinci_gpio_bank45->dir);
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/* set GPIO bank4 pin 15 high to drive VBUS */
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value = readl(&davinci_gpio_bank45->set_data);
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writel((value | DA8XX_USB_VBUS_GPIO), &davinci_gpio_bank45->set_data);
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}
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/*
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* Enable the usb0 phy. This initialization procedure is explained in
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* the DA8xx USB user guide document.
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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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u32 cfgchip2;
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cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);
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cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN |
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CFGCHIP2_OTGMODE | CFGCHIP2_REFFREQ);
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cfgchip2 |= CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN | CFGCHIP2_PHY_PLLON |
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CFGCHIP2_REFFREQ_24MHZ;
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writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);
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/* wait until the usb phy pll locks */
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timeout = musb_cfg.timeout;
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while (timeout--)
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if (readl(&davinci_syscfg_regs->cfgchip2) & CFGCHIP2_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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u32 cfgchip2;
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/*
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* Power down the on-chip PHY.
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*/
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cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);
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cfgchip2 &= ~CFGCHIP2_PHY_PLLON;
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cfgchip2 |= CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN;
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writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);
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}
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/*
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* This function performs DA8xx 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 psc for usb2.0 */
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lpsc_on(33);
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/* enable usb vbus */
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enable_vbus();
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/* reset the controller */
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writel(0x1, &da8xx_usb_regs->control);
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udelay(5000);
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/* start the on-chip usb phy and its pll */
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if (phy_on() == 0)
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return -1;
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/* Returns zero if e.g. not clocked */
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revision = readl(&da8xx_usb_regs->revision);
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if (revision == 0)
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return -1;
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/* Disable all interrupts */
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writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
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DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_set);
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return 0;
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}
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/*
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* This function performs DA8xx 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((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
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DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_clr);
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writel(0, &da8xx_usb_regs->eoi);
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}
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