[U-Boot] [PATCH v3 3/3] rockchip: check download key before bootup
Andy Yan
andy.yan at rock-chips.com
Wed Oct 11 07:01:31 UTC 2017
Enter download mode if the download key pressed.
Signed-off-by: Andy Yan <andy.yan at rock-chips.com>
---
Changes in v3: None
Changes in v2:
- more document
- move adc key detect as the default
arch/arm/mach-rockchip/boot_mode.c | 43 ++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/arch/arm/mach-rockchip/boot_mode.c b/arch/arm/mach-rockchip/boot_mode.c
index 4652490..bf0a410 100644
--- a/arch/arm/mach-rockchip/boot_mode.c
+++ b/arch/arm/mach-rockchip/boot_mode.c
@@ -5,14 +5,57 @@
*/
#include <common.h>
+#include <adc.h>
#include <asm/io.h>
#include <asm/arch/boot_mode.h>
+void set_back_to_bootrom_dnl_flag(void)
+{
+ writel(BOOT_BROM_DOWNLOAD, CONFIG_ROCKCHIP_BOOT_MODE_REG);
+}
+
+/*
+ * detect download key status by adc, most rockchip
+ * based boards use adc sample the download key status,
+ * but there are also some use gpio. So it's better to
+ * make this a weak function that can be override by
+ * some special boards.
+ */
+#define KEY_DOWN_MIN_VAL 0
+#define KEY_DOWN_MAX_VAL 30
+
+__weak int rockchip_dnl_key_pressed(void)
+{
+ unsigned int val;
+
+ if (adc_channel_single_shot("saradc", 1, &val)) {
+ printf("%s adc_channel_single_shot fail!\n", __func__);
+ return false;
+ }
+
+ if ((val >= KEY_DOWN_MIN_VAL) && (val <= KEY_DOWN_MAX_VAL))
+ return true;
+ else
+ return false;
+}
+
+void rockchip_dnl_mode_check(void)
+{
+ if (rockchip_dnl_key_pressed()) {
+ printf("download key pressed, entering download mode...");
+ set_back_to_bootrom_dnl_flag();
+ do_reset(NULL, 0, 0, NULL);
+ }
+}
+
int setup_boot_mode(void)
{
void *reg = (void *)CONFIG_ROCKCHIP_BOOT_MODE_REG;
int boot_mode = readl(reg);
+ rockchip_dnl_mode_check();
+
+ boot_mode = readl(reg);
debug("boot mode %x.\n", boot_mode);
/* Clear boot mode */
--
2.7.4
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