upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
118 lines
2.5 KiB
118 lines
2.5 KiB
/*
|
|
* Copyright (C) 2012 Boundary Devices Inc.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
#include <common.h>
|
|
#include <malloc.h>
|
|
#include <asm/arch/clock.h>
|
|
#include <asm/arch/imx-regs.h>
|
|
#include <linux/errno.h>
|
|
#include <asm/gpio.h>
|
|
#include <asm/imx-common/mxc_i2c.h>
|
|
#include <watchdog.h>
|
|
|
|
int force_idle_bus(void *priv)
|
|
{
|
|
int i;
|
|
int sda, scl;
|
|
ulong elapsed, start_time;
|
|
struct i2c_pads_info *p = (struct i2c_pads_info *)priv;
|
|
int ret = 0;
|
|
|
|
gpio_direction_input(p->sda.gp);
|
|
gpio_direction_input(p->scl.gp);
|
|
|
|
imx_iomux_v3_setup_pad(p->sda.gpio_mode);
|
|
imx_iomux_v3_setup_pad(p->scl.gpio_mode);
|
|
|
|
sda = gpio_get_value(p->sda.gp);
|
|
scl = gpio_get_value(p->scl.gp);
|
|
if ((sda & scl) == 1)
|
|
goto exit; /* Bus is idle already */
|
|
|
|
printf("%s: sda=%d scl=%d sda.gp=0x%x scl.gp=0x%x\n", __func__,
|
|
sda, scl, p->sda.gp, p->scl.gp);
|
|
/* Send high and low on the SCL line */
|
|
for (i = 0; i < 9; i++) {
|
|
gpio_direction_output(p->scl.gp, 0);
|
|
udelay(50);
|
|
gpio_direction_input(p->scl.gp);
|
|
udelay(50);
|
|
}
|
|
start_time = get_timer(0);
|
|
for (;;) {
|
|
sda = gpio_get_value(p->sda.gp);
|
|
scl = gpio_get_value(p->scl.gp);
|
|
if ((sda & scl) == 1)
|
|
break;
|
|
WATCHDOG_RESET();
|
|
elapsed = get_timer(start_time);
|
|
if (elapsed > (CONFIG_SYS_HZ / 5)) { /* .2 seconds */
|
|
ret = -EBUSY;
|
|
printf("%s: failed to clear bus, sda=%d scl=%d\n",
|
|
__func__, sda, scl);
|
|
break;
|
|
}
|
|
}
|
|
exit:
|
|
imx_iomux_v3_setup_pad(p->sda.i2c_mode);
|
|
imx_iomux_v3_setup_pad(p->scl.i2c_mode);
|
|
return ret;
|
|
}
|
|
|
|
static void * const i2c_bases[] = {
|
|
(void *)I2C1_BASE_ADDR,
|
|
(void *)I2C2_BASE_ADDR,
|
|
#ifdef I2C3_BASE_ADDR
|
|
(void *)I2C3_BASE_ADDR,
|
|
#endif
|
|
#ifdef I2C4_BASE_ADDR
|
|
(void *)I2C4_BASE_ADDR,
|
|
#endif
|
|
};
|
|
|
|
/* i2c_index can be from 0 - 3 */
|
|
int setup_i2c(unsigned i2c_index, int speed, int slave_addr,
|
|
struct i2c_pads_info *p)
|
|
{
|
|
char name[9];
|
|
int ret;
|
|
|
|
if (i2c_index >= ARRAY_SIZE(i2c_bases))
|
|
return -EINVAL;
|
|
|
|
snprintf(name, sizeof(name), "i2c_sda%01d", i2c_index);
|
|
ret = gpio_request(p->sda.gp, name);
|
|
if (ret)
|
|
return ret;
|
|
|
|
snprintf(name, sizeof(name), "i2c_scl%01d", i2c_index);
|
|
ret = gpio_request(p->scl.gp, name);
|
|
if (ret)
|
|
goto err_req;
|
|
|
|
/* Enable i2c clock */
|
|
ret = enable_i2c_clk(1, i2c_index);
|
|
if (ret)
|
|
goto err_clk;
|
|
|
|
/* Make sure bus is idle */
|
|
ret = force_idle_bus(p);
|
|
if (ret)
|
|
goto err_idle;
|
|
|
|
#ifndef CONFIG_DM_I2C
|
|
bus_i2c_init(i2c_index, speed, slave_addr, force_idle_bus, p);
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
err_idle:
|
|
err_clk:
|
|
gpio_free(p->scl.gp);
|
|
err_req:
|
|
gpio_free(p->sda.gp);
|
|
|
|
return ret;
|
|
}
|
|
|