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https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
127 lines
2.9 KiB
C
127 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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#include <common.h>
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#include "musb_core.h"
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#include <asm/arch/da8xx-usb.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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