mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-16 16:23:14 +00:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
139 lines
2.9 KiB
C
139 lines
2.9 KiB
C
/*
|
|
* am35x.c - TI's AM35x platform specific usb wrapper functions.
|
|
*
|
|
* Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
|
|
*
|
|
* Based on drivers/usb/musb/da8xx.c
|
|
*
|
|
* Copyright (c) 2010 Texas Instruments Incorporated
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
|
|
#include "am35x.h"
|
|
|
|
/* MUSB platform configuration */
|
|
struct musb_config musb_cfg = {
|
|
.regs = (struct musb_regs *)AM35X_USB_OTG_CORE_BASE,
|
|
.timeout = AM35X_USB_OTG_TIMEOUT,
|
|
.musb_speed = 0,
|
|
};
|
|
|
|
/*
|
|
* Enable the USB phy
|
|
*/
|
|
static u8 phy_on(void)
|
|
{
|
|
u32 devconf2;
|
|
u32 timeout;
|
|
|
|
devconf2 = readl(&am35x_scm_general_regs->devconf2);
|
|
|
|
devconf2 &= ~(DEVCONF2_RESET | DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN |
|
|
DEVCONF2_OTGMODE | DEVCONF2_REFFREQ |
|
|
DEVCONF2_PHY_GPIOMODE);
|
|
devconf2 |= DEVCONF2_SESENDEN | DEVCONF2_VBDTCTEN | DEVCONF2_PHY_PLLON |
|
|
DEVCONF2_REFFREQ_13MHZ | DEVCONF2_DATPOL;
|
|
|
|
writel(devconf2, &am35x_scm_general_regs->devconf2);
|
|
|
|
/* wait until the USB phy is turned on */
|
|
timeout = musb_cfg.timeout;
|
|
while (timeout--)
|
|
if (readl(&am35x_scm_general_regs->devconf2) & DEVCONF2_PHYCKGD)
|
|
return 1;
|
|
|
|
/* USB phy was not turned on */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Disable the USB phy
|
|
*/
|
|
static void phy_off(void)
|
|
{
|
|
u32 devconf2;
|
|
|
|
/*
|
|
* Power down the on-chip PHY.
|
|
*/
|
|
devconf2 = readl(&am35x_scm_general_regs->devconf2);
|
|
|
|
devconf2 &= ~DEVCONF2_PHY_PLLON;
|
|
devconf2 |= DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN;
|
|
writel(devconf2, &am35x_scm_general_regs->devconf2);
|
|
}
|
|
|
|
/*
|
|
* This function performs platform specific initialization for usb0.
|
|
*/
|
|
int musb_platform_init(void)
|
|
{
|
|
u32 revision;
|
|
u32 sw_reset;
|
|
|
|
/* global usb reset */
|
|
sw_reset = readl(&am35x_scm_general_regs->ip_sw_reset);
|
|
sw_reset |= (1 << 0);
|
|
writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
|
|
sw_reset &= ~(1 << 0);
|
|
writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
|
|
|
|
/* reset the controller */
|
|
writel(0x1, &am35x_usb_regs->control);
|
|
udelay(5000);
|
|
|
|
/* start the on-chip usb phy and its pll */
|
|
if (phy_on() == 0)
|
|
return -1;
|
|
|
|
/* Returns zero if e.g. not clocked */
|
|
revision = readl(&am35x_usb_regs->revision);
|
|
if (revision == 0)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function performs platform specific deinitialization for usb0.
|
|
*/
|
|
void musb_platform_deinit(void)
|
|
{
|
|
/* Turn off the phy */
|
|
phy_off();
|
|
}
|
|
|
|
/*
|
|
* This function reads data from endpoint fifo for AM35x
|
|
* which supports only 32bit read operation.
|
|
*
|
|
* ep - endpoint number
|
|
* length - number of bytes to read from FIFO
|
|
* fifo_data - pointer to data buffer into which data is read
|
|
*/
|
|
__attribute__((weak))
|
|
void read_fifo(u8 ep, u32 length, void *fifo_data)
|
|
{
|
|
u8 *data = (u8 *)fifo_data;
|
|
u32 val;
|
|
int i;
|
|
|
|
/* select the endpoint index */
|
|
writeb(ep, &musbr->index);
|
|
|
|
if (length > 4) {
|
|
for (i = 0; i < (length >> 2); i++) {
|
|
val = readl(&musbr->fifox[ep]);
|
|
memcpy(data, &val, 4);
|
|
data += 4;
|
|
}
|
|
length %= 4;
|
|
}
|
|
if (length > 0) {
|
|
val = readl(&musbr->fifox[ep]);
|
|
memcpy(data, &val, length);
|
|
}
|
|
}
|