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authorBjorn Andersson <bjorn.andersson@linaro.org>2017-08-14 15:46:18 -0700
committerAndy Gross <andy.gross@linaro.org>2017-10-11 23:48:27 -0500
commit8c1b7dc9ba2294c6dbd1870a3d2e534bfda3047a (patch)
tree8d9823b880adb03cdf422d6773c720b79c6233e5 /drivers/firmware/qcom_scm.h
parent4e659dbe2d02a56ca0df25c77e099760252a329c (diff)
firmware: qcom: scm: Expose download-mode control
In order to aid post-mortem debugging the Qualcomm platforms provide a "memory download mode", where the boot loader will provide an interface for custom tools to "download" the content of RAM to a host machine. The mode is triggered by writing a magic value somewhere in RAM, that is read in the boot code path after a warm-restart. Two mechanism for setting this magic value are supported in modern platforms; a direct SCM call to enable the mode or through a secure io write of a magic value. In order for a normal reboot not to trigger "download mode" the magic must be cleared during a clean reboot. Download mode has to be enabled by including qcom_scm.download_mode=1 on the command line. Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Andy Gross <andy.gross@linaro.org>
Diffstat (limited to 'drivers/firmware/qcom_scm.h')
-rw-r--r--drivers/firmware/qcom_scm.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
index a60e4b9b1394..83f171c23943 100644
--- a/drivers/firmware/qcom_scm.h
+++ b/drivers/firmware/qcom_scm.h
@@ -14,9 +14,11 @@
#define QCOM_SCM_SVC_BOOT 0x1
#define QCOM_SCM_BOOT_ADDR 0x1
+#define QCOM_SCM_SET_DLOAD_MODE 0x10
#define QCOM_SCM_BOOT_ADDR_MC 0x11
#define QCOM_SCM_SET_REMOTE_STATE 0xa
extern int __qcom_scm_set_remote_state(struct device *dev, u32 state, u32 id);
+extern int __qcom_scm_set_dload_mode(struct device *dev, bool enable);
#define QCOM_SCM_FLAG_HLOS 0x01
#define QCOM_SCM_FLAG_COLDBOOT_MC 0x02