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rockchip: bootrom: update support for back to brom via boot_mode reg 

We should clear that the purpose is enter maskrom and get into USB boot:
1. set the bootmode reg to bootrom mode in U-Boot/Kernel by cmd or Tool;
2. Get back to bootrom with non-zero return value if not boot from USB;
3. Clean the tag if already enter USB boot.

Change-Id: I1127357c3b2f499519387880830b2b382f46af10
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Kever Yang 2018-09-26 11:54:53 +08:00
parent 2daa9732c0
commit ca0ddd934d
1 changed files with 11 additions and 8 deletions
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19
arch/arm/mach-rockchip/bootrom.c
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@ -31,28 +31,31 @@ void back_to_bootrom(enum rockchip_bootrom_cmd brom_cmd)
}
/*
* we back to bootrom download mode if get a
* We back to bootrom download mode if get a
* BOOT_BROM_DOWNLOAD flag in boot mode register
*
* note: the boot mode register is configured by
* application(next stage bootloader, kernel, etc),
* and the bootrom never check this register, so we need
* The bootrom never check this register, so we need
* to check it and back to bootrom at very early bootstage(before
* some basic configurations(such as interrupts) been
* changed by TPL/SPL, as the bootrom download operation
* relys on many default settings(such as interrupts) by
* it's self.
* Note: the boot mode register is configured by
* application(next stage bootloader, kernel, etc) via command or PC Tool,
* cleared by USB download(bootrom mode) or loader(other mode) after the
* tag has work.
*/
static bool check_back_to_brom_dnl_flag(void)
{
u32 boot_mode;
u32 boot_mode, boot_id;
if (CONFIG_ROCKCHIP_BOOT_MODE_REG) {
if (CONFIG_ROCKCHIP_BOOT_MODE_REG && BROM_BOOTSOURCE_ID_ADDR) {
boot_mode = readl(CONFIG_ROCKCHIP_BOOT_MODE_REG);
if (boot_mode == BOOT_BROM_DOWNLOAD) {
boot_id = readl(BROM_BOOTSOURCE_ID_ADDR);
if (boot_id == BROM_BOOTSOURCE_USB)
writel(0, CONFIG_ROCKCHIP_BOOT_MODE_REG);
else if (boot_mode == BOOT_BROM_DOWNLOAD)
return true;
}
}
return false;