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authorBjorn Andersson <bjorn.andersson@linaro.org>2017-08-15 01:46:18 +0300
committerAndy Gross <andy.gross@linaro.org>2017-10-12 07:48:27 +0300
commit8c1b7dc9ba2294c6dbd1870a3d2e534bfda3047a (patch)
tree8d9823b880adb03cdf422d6773c720b79c6233e5 /drivers/firmware/qcom_scm-32.c
parent4e659dbe2d02a56ca0df25c77e099760252a329c (diff)
downloadlinux-8c1b7dc9ba2294c6dbd1870a3d2e534bfda3047a.tar.xz
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-32.c')
-rw-r--r--drivers/firmware/qcom_scm-32.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-32.c
index 11fdb1584823..68b2033bc30e 100644
--- a/drivers/firmware/qcom_scm-32.c
+++ b/drivers/firmware/qcom_scm-32.c
@@ -561,6 +561,12 @@ int __qcom_scm_pas_mss_reset(struct device *dev, bool reset)
return ret ? : le32_to_cpu(out);
}
+int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
+{
+ return qcom_scm_call_atomic2(QCOM_SCM_SVC_BOOT, QCOM_SCM_SET_DLOAD_MODE,
+ enable ? QCOM_SCM_SET_DLOAD_MODE : 0, 0);
+}
+
int __qcom_scm_set_remote_state(struct device *dev, u32 state, u32 id)
{
struct {