topic: add reset functions for SWD

[openocd.git] / src / jtag / core.c

diff --git a/src/jtag/core.c b/src/jtag/core.c
index a36345b77af194b6fba39cd7865ed5dc60c7bc23..99a9eb75aeadd81bc925d4d99e04241703fc174c 100644 (file)
--- a/src/jtag/core.c
+++ b/src/jtag/core.c
@@ -33,6 +33,7 @@
 #endif
 
 #include "jtag.h"
+#include "swd.h"
 #include "interface.h"
 #include <transport/transport.h>
 
@@ -606,6 +607,46 @@ void jtag_add_clocks(int num_cycles)
        }
 }
 
+void swd_add_reset(int req_srst)
+{
+       if (req_srst) {
+               if (!(jtag_reset_config & RESET_HAS_SRST)) {
+                       LOG_ERROR("BUG: can't assert SRST");
+                       jtag_set_error(ERROR_FAIL);
+                       return;
+               }
+               req_srst = 1;
+       }
+
+       /* Maybe change SRST signal state */
+       if (jtag_srst != req_srst) {
+               int retval;
+
+               retval = interface_jtag_add_reset(0, req_srst);
+               if (retval != ERROR_OK)
+                       jtag_set_error(retval);
+               else
+                       retval = jtag_execute_queue();
+
+               if (retval != ERROR_OK) {
+                       LOG_ERROR("TRST/SRST error");
+                       return;
+               }
+
+               /* SRST resets everything hooked up to that signal */
+               jtag_srst = req_srst;
+               if (jtag_srst) {
+                       LOG_DEBUG("SRST line asserted");
+                       if (adapter_nsrst_assert_width)
+                               jtag_add_sleep(adapter_nsrst_assert_width * 1000);
+               } else {
+                       LOG_DEBUG("SRST line released");
+                       if (adapter_nsrst_delay)
+                               jtag_add_sleep(adapter_nsrst_delay * 1000);
+               }
+       }
+}
+
 void jtag_add_reset(int req_tlr_or_trst, int req_srst)
 {
        int trst_with_tlr = 0;
@@ -1455,6 +1496,20 @@ int adapter_quit(void)
        return ERROR_OK;
 }
 
+int swd_init_reset(struct command_context *cmd_ctx)
+{
+       int retval = adapter_init(cmd_ctx);
+       if (retval != ERROR_OK)
+               return retval;
+
+       LOG_DEBUG("Initializing with hard SRST reset");
+
+       if (jtag_reset_config & RESET_HAS_SRST)
+               swd_add_reset(1);
+       swd_add_reset(0);
+       retval = jtag_execute_queue();
+       return retval;
+}
 
 int jtag_init_reset(struct command_context *cmd_ctx)
 {
@@ -1738,3 +1793,32 @@ bool transport_is_jtag(void)
 {
        return get_current_transport() == &jtag_transport;
 }
+
+void adapter_assert_reset(void)
+{
+       if (transport_is_jtag()) {
+               if (jtag_reset_config & RESET_SRST_PULLS_TRST)
+                       jtag_add_reset(1, 1);
+               else
+                       jtag_add_reset(0, 1);
+       } else if (transport_is_swd())
+               swd_add_reset(1);
+       else if (get_current_transport() != NULL)
+               LOG_ERROR("reset is not supported on %s",
+                       get_current_transport()->name);
+       else
+               LOG_ERROR("transport is not selected");
+}
+
+void adapter_deassert_reset(void)
+{
+       if (transport_is_jtag())
+               jtag_add_reset(0, 0);
+       else if (transport_is_swd())
+               swd_add_reset(0);
+       else if (get_current_transport() != NULL)
+               LOG_ERROR("reset is not supported on %s",
+                       get_current_transport()->name);
+       else
+               LOG_ERROR("transport is not selected");
+}