mirror of
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>
138 lines
2.9 KiB
C
138 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* am35x.c - TI's AM35x 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/da8xx.c
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*
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* Copyright (c) 2010 Texas Instruments Incorporated
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*/
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#include <common.h>
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#include "am35x.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 *)AM35X_USB_OTG_CORE_BASE,
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.timeout = AM35X_USB_OTG_TIMEOUT,
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.musb_speed = 0,
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};
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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 devconf2;
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u32 timeout;
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devconf2 = readl(&am35x_scm_general_regs->devconf2);
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devconf2 &= ~(DEVCONF2_RESET | DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN |
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DEVCONF2_OTGMODE | DEVCONF2_REFFREQ |
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DEVCONF2_PHY_GPIOMODE);
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devconf2 |= DEVCONF2_SESENDEN | DEVCONF2_VBDTCTEN | DEVCONF2_PHY_PLLON |
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DEVCONF2_REFFREQ_13MHZ | DEVCONF2_DATPOL;
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writel(devconf2, &am35x_scm_general_regs->devconf2);
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/* wait until the USB phy is turned on */
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timeout = musb_cfg.timeout;
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while (timeout--)
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if (readl(&am35x_scm_general_regs->devconf2) & DEVCONF2_PHYCKGD)
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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 devconf2;
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/*
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* Power down the on-chip PHY.
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*/
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devconf2 = readl(&am35x_scm_general_regs->devconf2);
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devconf2 &= ~DEVCONF2_PHY_PLLON;
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devconf2 |= DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN;
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writel(devconf2, &am35x_scm_general_regs->devconf2);
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}
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/*
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* This function performs 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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u32 sw_reset;
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/* global usb reset */
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sw_reset = readl(&am35x_scm_general_regs->ip_sw_reset);
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sw_reset |= (1 << 0);
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writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
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sw_reset &= ~(1 << 0);
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writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
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/* reset the controller */
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writel(0x1, &am35x_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(&am35x_usb_regs->revision);
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if (revision == 0)
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return -1;
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return 0;
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}
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/*
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* This function performs 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 off the phy */
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phy_off();
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}
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/*
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* This function reads data from endpoint fifo for AM35x
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* which supports only 32bit read operation.
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*
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* ep - endpoint number
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* length - number of bytes to read from FIFO
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* fifo_data - pointer to data buffer into which data is read
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*/
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__attribute__((weak))
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void read_fifo(u8 ep, u32 length, void *fifo_data)
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{
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u8 *data = (u8 *)fifo_data;
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u32 val;
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int i;
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/* select the endpoint index */
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writeb(ep, &musbr->index);
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if (length > 4) {
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for (i = 0; i < (length >> 2); i++) {
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val = readl(&musbr->fifox[ep]);
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memcpy(data, &val, 4);
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data += 4;
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}
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length %= 4;
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}
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if (length > 0) {
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val = readl(&musbr->fifox[ep]);
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memcpy(data, &val, length);
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}
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}
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