powerdown.patch

commit 9bc389963dc95edc679b31d32c285f2dd6aab619 (HEAD -> jim-rtt)
Author: Jim Paris <jim@jtan.com>
Date:   Thu Nov 15 12:30:30 2018 -0500

    target/arm_adi_v5: power off chip debug hardware on shutdown
    
    Change-Id: I759442371439ec54597f75964115776bfaa67949

diff --git a/src/target/arm_adi_v5.c b/src/target/arm_adi_v5.c
index 4dc2594cf521..52fe7c9c6311 100644
--- a/src/target/arm_adi_v5.c
+++ b/src/target/arm_adi_v5.c
@@ -710,6 +710,26 @@ int dap_dp_init(struct adiv5_dap *dap)
        return retval;
 }
 
+/**
+ * Deinitialize a DAP.  This turns off power to the debug domain.
+ *
+ * @param dap The DAP being initialized.
+ */
+int dap_dp_uninit(struct adiv5_dap *dap)
+{
+       int retval;
+
+       LOG_DEBUG("%s", adiv5_dap_name(dap));
+
+       /* Deassert CDBGPWRUPREQ and CSYSPWRUPREQ */
+       dap->dp_ctrl_stat = 0;
+       retval = dap_queue_dp_write(dap, DP_CTRL_STAT, dap->dp_ctrl_stat);
+       if (retval != ERROR_OK)
+               return retval;
+
+       return dap_run(dap);
+}
+
 /**
  * Initialize a DAP.  This sets up the power domains, prepares the DP
  * for further use, and arranges to use AP #0 for all AP operations
diff --git a/src/target/arm_adi_v5.h b/src/target/arm_adi_v5.h
index 22c316630691..7ae75a2c803f 100644
--- a/src/target/arm_adi_v5.h
+++ b/src/target/arm_adi_v5.h
@@ -486,6 +486,9 @@ int mem_ap_write_buf_noincr(struct adiv5_ap *ap,
 int dap_dp_init(struct adiv5_dap *dap);
 int mem_ap_init(struct adiv5_ap *ap);
 
+/* Deinitialisation of the debug system and power domains */
+int dap_dp_uninit(struct adiv5_dap *dap);
+
 /* Invalidate cached DP select and cached TAR and CSW of all APs */
 void dap_invalidate_cache(struct adiv5_dap *dap);
 
diff --git a/src/target/cortex_m.c b/src/target/cortex_m.c
index dcb3ddd8264f..5f49af6c4ccb 100644
--- a/src/target/cortex_m.c
+++ b/src/target/cortex_m.c
@@ -1676,6 +1676,8 @@ void cortex_m_deinit_target(struct target *target)
 {
        struct cortex_m_common *cortex_m = target_to_cm(target);
 
+       dap_dp_uninit(cortex_m->armv7m.debug_ap->dap);
+
        free(cortex_m->fp_comparator_list);
 
        cortex_m_dwt_free(target);