mirror of
https://source.denx.de/u-boot/u-boot.git
synced 2025-09-15 10:51:24 +02:00
d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commit c8ffd1356d42223cbb8c86280a083cc3c93e6426, reversing changes made to 2ee6f3a5f7550de3599faef9704e166e5dcace35. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2012 Boundary Devices Inc.
|
|
*/
|
|
#include <common.h>
|
|
#include <malloc.h>
|
|
#include <asm/arch/clock.h>
|
|
#include <asm/arch/imx-regs.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/errno.h>
|
|
#include <asm/gpio.h>
|
|
#include <asm/mach-imx/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;
|
|
schedule();
|
|
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
|
|
#ifdef I2C5_BASE_ADDR
|
|
(void *)I2C5_BASE_ADDR,
|
|
#endif
|
|
#ifdef I2C6_BASE_ADDR
|
|
(void *)I2C6_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;
|
|
|
|
#if !CONFIG_IS_ENABLED(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;
|
|
}
|