u-boot/board/amazon/kc1/kc1.c
Paul Kocialkowski 523849a088 kc1: Proper reboot mode and boot reason validation
With the previous implementation, rebooting without registering a recognized
reboot mode would end up with U-Boot checking for a valid power-on reason, which
might result in the device turning off (e.g. with no USB cable attached and no
buttons pressed).

Since this approach is not viable (breaks reboot in most cases), the validity of
the reboot reason is checked (in turn, by checking that a warm reset happened,
as there is no magic) to detect a reboot and the 'o' char is recognized to
indicate that power-off is required. Still, that might be overridden by the
detection of usual power-on reasons, on purpose.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
2016-04-01 17:18:06 -04:00

179 lines
3.7 KiB
C

/*
* Amazon Kindle Fire (first generation) codename kc1 config
*
* Copyright (C) 2016 Paul Kocialkowski <contact@paulk.fr>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <common.h>
#include <linux/ctype.h>
#include <linux/usb/musb.h>
#include <asm/omap_musb.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/mmc_host_def.h>
#include <asm/gpio.h>
#include <asm/emif.h>
#include <twl6030.h>
#include "kc1.h"
DECLARE_GLOBAL_DATA_PTR;
const struct omap_sysinfo sysinfo = {
.board_string = "kc1"
};
static struct musb_hdrc_config musb_config = {
.multipoint = 1,
.dyn_fifo = 1,
.num_eps = 16,
.ram_bits = 12
};
static struct omap_musb_board_data musb_board_data = {
.interface_type = MUSB_INTERFACE_UTMI,
};
static struct musb_hdrc_platform_data musb_platform_data = {
.mode = MUSB_PERIPHERAL,
.config = &musb_config,
.power = 100,
.platform_ops = &omap2430_ops,
.board_data = &musb_board_data,
};
void set_muxconf_regs(void)
{
do_set_mux((*ctrl)->control_padconf_core_base, core_padconf_array,
sizeof(core_padconf_array) / sizeof(struct pad_conf_entry));
}
struct lpddr2_device_details *emif_get_device_details(u32 emif_nr, u8 cs,
struct lpddr2_device_details *lpddr2_dev_details)
{
if (cs == CS1)
return NULL;
*lpddr2_dev_details = elpida_2G_S4_details;
return lpddr2_dev_details;
}
void emif_get_device_timings(u32 emif_nr,
const struct lpddr2_device_timings **cs0_device_timings,
const struct lpddr2_device_timings **cs1_device_timings)
{
*cs0_device_timings = &elpida_2G_S4_timings;
*cs1_device_timings = NULL;
}
int board_init(void)
{
/* GPMC init */
gpmc_init();
/* MACH number */
gd->bd->bi_arch_number = MACH_TYPE_OMAP_4430SDP;
/* ATAGs location */
gd->bd->bi_boot_params = OMAP44XX_DRAM_ADDR_SPACE_START + 0x100;
return 0;
}
int misc_init_r(void)
{
char reboot_mode[2] = { 0 };
u32 data = 0;
u32 value;
int rc;
/* Reboot mode */
rc = omap_reboot_mode(reboot_mode, sizeof(reboot_mode));
/* USB ID pin pull-up indicates factory (fastboot) cable detection. */
gpio_request(KC1_GPIO_USB_ID, "USB_ID");
gpio_direction_input(KC1_GPIO_USB_ID);
value = gpio_get_value(KC1_GPIO_USB_ID);
if (value)
reboot_mode[0] = 'b';
if (rc < 0 || reboot_mode[0] == 'o') {
/*
* When not rebooting, valid power on reasons are either the
* power button, charger plug or USB plug.
*/
data |= twl6030_input_power_button();
data |= twl6030_input_charger();
data |= twl6030_input_usb();
if (!data)
twl6030_power_off();
}
if (reboot_mode[0] > 0 && isascii(reboot_mode[0])) {
if (!getenv("reboot-mode"))
setenv("reboot-mode", (char *)reboot_mode);
}
omap_reboot_mode_clear();
/* Serial number */
omap_die_id_serial();
/* MUSB */
musb_register(&musb_platform_data, &musb_board_data, (void *)MUSB_BASE);
return 0;
}
u32 get_board_rev(void)
{
u32 value = 0;
gpio_request(KC1_GPIO_MBID0, "MBID0");
gpio_request(KC1_GPIO_MBID1, "MBID1");
gpio_request(KC1_GPIO_MBID2, "MBID2");
gpio_request(KC1_GPIO_MBID3, "MBID3");
gpio_direction_input(KC1_GPIO_MBID0);
gpio_direction_input(KC1_GPIO_MBID1);
gpio_direction_input(KC1_GPIO_MBID2);
gpio_direction_input(KC1_GPIO_MBID3);
value |= (gpio_get_value(KC1_GPIO_MBID0) << 0);
value |= (gpio_get_value(KC1_GPIO_MBID1) << 1);
value |= (gpio_get_value(KC1_GPIO_MBID2) << 2);
value |= (gpio_get_value(KC1_GPIO_MBID3) << 3);
return value;
}
void get_board_serial(struct tag_serialnr *serialnr)
{
omap_die_id_get_board_serial(serialnr);
}
int fb_set_reboot_flag(void)
{
return omap_reboot_mode_store("b");
}
#ifndef CONFIG_SPL_BUILD
int board_mmc_init(bd_t *bis)
{
return omap_mmc_init(1, 0, 0, -1, -1);
}
#endif
void board_mmc_power_init(void)
{
twl6030_power_mmc_init(1);
}