[U-Boot] [PATCH v2 2/3] rockchip: add support for enter to bootrom download mode

Andy Yan andy.yan at rock-chips.com
Thu Sep 14 08:52:01 UTC 2017


Rockchip bootrom will enter download mode if it returns from
spl/tpl with a non-zero value and couldn't find a valid image
in the backup partition.
This patch provide a method to instruct the system to back to
bootrom download mode by checking the BROM_DOWNLOAD_FLAG register.
As the bootrom download function relys on some modules such as
interrupts, so we need to back to bootrom as early as possbile
before the tpl/tps code override the interrupt configurations.

Signed-off-by: Andy Yan <andy.yan at rock-chips.com>
Reviewed-by: Kever Yang <kever.yang at rock-chips.com>

---

Changes in v2:
- implement the back to bootrom download mode check in c, thanks for Dr. Philipp Tomsich's suggestion.

 arch/arm/include/asm/arch-rockchip/boot_mode.h |  5 +++++
 arch/arm/include/asm/arch-rockchip/bootrom.h   | 15 ++++++++++++-
 arch/arm/mach-rockchip/Kconfig                 |  1 +
 arch/arm/mach-rockchip/bootrom.c               | 31 +++++++++++++++++++++++++-
 arch/arm/mach-rockchip/save_boot_param.S       | 25 ++++++++++++++-------
 5 files changed, 67 insertions(+), 10 deletions(-)

diff --git a/arch/arm/include/asm/arch-rockchip/boot_mode.h b/arch/arm/include/asm/arch-rockchip/boot_mode.h
index 163b2e7..c2cf6fd 100644
--- a/arch/arm/include/asm/arch-rockchip/boot_mode.h
+++ b/arch/arm/include/asm/arch-rockchip/boot_mode.h
@@ -15,7 +15,12 @@
 #define BOOT_CHARGING		(REBOOT_FLAG + 11)
 /* enter usb mass storage mode */
 #define BOOT_UMS		(REBOOT_FLAG + 12)
+/* enter bootrom download mode */
+#define BOOT_BROM_DOWNLOAD	0xEF08A53C
 
+#ifndef __ASSEMBLY__
 int setup_boot_mode(void);
+void check_back_to_brom_dnl_flag(void);
+#endif
 
 #endif
diff --git a/arch/arm/include/asm/arch-rockchip/bootrom.h b/arch/arm/include/asm/arch-rockchip/bootrom.h
index 92eb878..0bdea14 100644
--- a/arch/arm/include/asm/arch-rockchip/bootrom.h
+++ b/arch/arm/include/asm/arch-rockchip/bootrom.h
@@ -8,6 +8,16 @@
 #define _ASM_ARCH_BOOTROM_H
 
 /*
+ *@BOOT_CONTINUE: bootrom continue load next stage image and boot.
+ *@BOOT_BROM_DNL, bootrom enter download mode if no valid image
+ *		  found in backup partition.
+ */
+enum {
+	BOOT_BROM_CONTINUE = 0,
+	BOOT_BROM_DNL = 1
+};
+
+/*
  * Saved Stack pointer address.
  * Access might be needed in some special cases.
  */
@@ -21,7 +31,10 @@ void back_to_bootrom(void);
 
 /**
  * Assembler component for the above (do not call this directly)
+ * @mode: BOOT_BROM_CONTINUE, bootrom continue load next stage image and boot;
+ *        BOOT_BROM_DNL, bootrom enter download mode if no valid image
+ *        found in packup partition.
  */
-void _back_to_bootrom_s(void);
+void _back_to_bootrom_s(int mode);
 
 #endif
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index bf01395..2fd9eb2 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -113,6 +113,7 @@ config ROCKCHIP_RK3399
 	select SPL_SERIAL_SUPPORT
 	select SPL_DRIVERS_MISC_SUPPORT
 	select ENABLE_ARM_SOC_BOOT0_HOOK
+	select ROCKCHIP_BROM_HELPER
 	select DEBUG_UART_BOARD_INIT
 	select BOARD_LATE_INIT
 	help
diff --git a/arch/arm/mach-rockchip/bootrom.c b/arch/arm/mach-rockchip/bootrom.c
index 8380e4e..463462c 100644
--- a/arch/arm/mach-rockchip/bootrom.c
+++ b/arch/arm/mach-rockchip/bootrom.c
@@ -5,12 +5,41 @@
  */
 
 #include <common.h>
+#include <asm/io.h>
 #include <asm/arch/bootrom.h>
+#include <asm/arch/boot_mode.h>
 
 void back_to_bootrom(void)
 {
 #if CONFIG_IS_ENABLED(LIBCOMMON_SUPPORT)
 	puts("Returning to boot ROM...\n");
 #endif
-	_back_to_bootrom_s();
+	_back_to_bootrom_s(BOOT_BROM_CONTINUE);
+}
+
+/*
+ * we back to bootrom download mode if get a
+ * BOOT_BROM_DOWNLOAD flag in boot mode register
+ *
+ * note: (a)the boot mode register is configured by
+ * application(next stage bootloader, kernel, etc),
+ * the bootrom never check this register, so we need
+ * to check it and back at very early bootstage(before
+ * some basic configurations such as interrupts been
+ * changed by TPL/TPL), as the bootrom download operation
+ * relys on many default settings(such as interrupts) by
+ * it's self.
+ *       (b)this function share the sampe SP with bootrom code.
+ */
+void check_back_to_brom_dnl_flag(void)
+{
+	u32 boot_mode;
+
+	if (CONFIG_ROCKCHIP_BOOT_MODE_REG) {
+		boot_mode = readl(CONFIG_ROCKCHIP_BOOT_MODE_REG);
+		if (boot_mode == BOOT_BROM_DOWNLOAD) {
+			writel(0, CONFIG_ROCKCHIP_BOOT_MODE_REG);
+			_back_to_bootrom_s(BOOT_BROM_DNL);
+		}
+	}
 }
diff --git a/arch/arm/mach-rockchip/save_boot_param.S b/arch/arm/mach-rockchip/save_boot_param.S
index 50fce20..e8fa10b 100644
--- a/arch/arm/mach-rockchip/save_boot_param.S
+++ b/arch/arm/mach-rockchip/save_boot_param.S
@@ -23,14 +23,19 @@ ENTRY(save_boot_params)
 	ldr	x8, =SAVE_SP_ADDR
 	mov	x9, sp
 	str	x9, [x8]
+	bl	check_back_to_brom_dnl_flag
 	b	save_boot_params_ret  /* back to my caller */
 ENDPROC(save_boot_params)
 
+/*
+ * x0: return value for bootrom, non-zero for bootrom download
+ *     mode and zero for normal boot mode
+ */
 .globl _back_to_bootrom_s
 ENTRY(_back_to_bootrom_s)
-	ldr	x0, =SAVE_SP_ADDR
-	ldr	x0, [x0]
-	mov	sp, x0
+	ldr	x1, =SAVE_SP_ADDR
+	ldr	x1, [x1]
+	mov	sp, x1
 	ldp	x29, x30, [sp, #0x50]
 	ldp	x27, x28, [sp, #0x40]
 	ldp	x25, x26, [sp, #0x30]
@@ -38,7 +43,6 @@ ENTRY(_back_to_bootrom_s)
 	ldp	x21, x22, [sp, #0x10]
 	ldp	x19, x20, [sp]
 	add	sp, sp, #0x60
-	mov	x0, xzr
 	ret
 ENDPROC(_back_to_bootrom_s)
 #else
@@ -55,15 +59,20 @@ ENTRY(save_boot_params)
 	push	{r1-r12, lr}
 	ldr	r0, =SAVE_SP_ADDR
 	str	sp, [r0]
-	b	save_boot_params_ret		@ back to my caller
+	bl	check_back_to_brom_dnl_flag
+	b       save_boot_params_ret            @ back to my caller
 ENDPROC(save_boot_params)
 
 
+/*
+ * r0: return value for bootrom, non-zero for
+ *     bootrom download mode and zero for normal
+ *     boot mode
+ */
 .globl _back_to_bootrom_s
 ENTRY(_back_to_bootrom_s)
-	ldr	r0, =SAVE_SP_ADDR
-	ldr	sp, [r0]
-	mov	r0, #0
+	ldr	r1, =SAVE_SP_ADDR
+	ldr	sp, [r1]
 	pop	{r1-r12, pc}
 ENDPROC(_back_to_bootrom_s)
 #endif
-- 
2.7.4




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