mirror of
https://github.com/AsahiLinux/u-boot
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109 lines
2.1 KiB
C
109 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2016 Rockchip Electronics Co., Ltd
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*/
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#include <common.h>
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#include <adc.h>
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#include <command.h>
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#include <env.h>
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#include <log.h>
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#include <asm/io.h>
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#include <asm/arch-rockchip/boot_mode.h>
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#include <dm/device.h>
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#include <dm/uclass.h>
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#if (CONFIG_ROCKCHIP_BOOT_MODE_REG == 0)
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int setup_boot_mode(void)
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{
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return 0;
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}
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#else
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void set_back_to_bootrom_dnl_flag(void)
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{
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writel(BOOT_BROM_DOWNLOAD, CONFIG_ROCKCHIP_BOOT_MODE_REG);
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}
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/*
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* detect download key status by adc, most rockchip
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* based boards use adc sample the download key status,
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* but there are also some use gpio. So it's better to
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* make this a weak function that can be override by
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* some special boards.
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*/
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#define KEY_DOWN_MIN_VAL 0
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#define KEY_DOWN_MAX_VAL 30
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__weak int rockchip_dnl_key_pressed(void)
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{
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unsigned int val;
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struct udevice *dev;
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struct uclass *uc;
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int ret;
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ret = uclass_get(UCLASS_ADC, &uc);
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if (ret)
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return false;
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ret = -ENODEV;
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uclass_foreach_dev(dev, uc) {
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if (!strncmp(dev->name, "saradc", 6)) {
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ret = adc_channel_single_shot(dev->name, 1, &val);
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break;
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}
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}
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if (ret == -ENODEV) {
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pr_warn("%s: no saradc device found\n", __func__);
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return false;
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} else if (ret) {
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pr_err("%s: adc_channel_single_shot fail!\n", __func__);
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return false;
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}
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if ((val >= KEY_DOWN_MIN_VAL) && (val <= KEY_DOWN_MAX_VAL))
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return true;
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else
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return false;
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}
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void rockchip_dnl_mode_check(void)
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{
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if (rockchip_dnl_key_pressed()) {
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printf("download key pressed, entering download mode...");
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set_back_to_bootrom_dnl_flag();
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do_reset(NULL, 0, 0, NULL);
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}
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}
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int setup_boot_mode(void)
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{
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void *reg = (void *)CONFIG_ROCKCHIP_BOOT_MODE_REG;
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int boot_mode = readl(reg);
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rockchip_dnl_mode_check();
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boot_mode = readl(reg);
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debug("%s: boot mode 0x%08x\n", __func__, boot_mode);
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/* Clear boot mode */
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writel(BOOT_NORMAL, reg);
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switch (boot_mode) {
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case BOOT_FASTBOOT:
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debug("%s: enter fastboot!\n", __func__);
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env_set("preboot", "setenv preboot; fastboot usb0");
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break;
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case BOOT_UMS:
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debug("%s: enter UMS!\n", __func__);
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env_set("preboot", "setenv preboot; ums mmc 0");
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break;
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}
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return 0;
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}
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#endif
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