commit 0d77440cf2c99b0e088255e19b645e6ce5de435a
author Timothy Trippel <ttrippel@google.com> Sun May 01 23:51:40 2022 -0700
committer Timothy Trippel <5633066+timothytrippel@users.noreply.github.com> Mon May 02 12:05:18 2022 -0700
tree c260d5df2e45f120b5b590dc00e2488f48c8dac2
parent 078b72318c9d2284fdf4ce049b831a958015a082

[dif/sysrst_ctrl] add locking DIFs

This adds the locking DIFs and corresponding unit tests.

Signed-off-by: Timothy Trippel <ttrippel@google.com>

sw/device/lib/dif/dif_sysrst_ctrl.c

diff --git a/sw/device/lib/dif/dif_sysrst_ctrl.c b/sw/device/lib/dif/dif_sysrst_ctrl.c
index 9d182b4..e73e5d7 100644
--- a/sw/device/lib/dif/dif_sysrst_ctrl.c
+++ b/sw/device/lib/dif/dif_sysrst_ctrl.c
@@ -604,3 +604,25 @@
 
   return kDifOk;
 }
+
+dif_result_t dif_sysrst_ctrl_lock(const dif_sysrst_ctrl_t *sysrst_ctrl) {
+  if (sysrst_ctrl == NULL) {
+    return kDifBadArg;
+  }
+
+  mmio_region_write32(sysrst_ctrl->base_addr, SYSRST_CTRL_REGWEN_REG_OFFSET, 0);
+
+  return kDifOk;
+}
+
+dif_result_t dif_sysrst_ctrl_is_locked(const dif_sysrst_ctrl_t *sysrst_ctrl,
+                                       bool *is_locked) {
+  if (sysrst_ctrl == NULL || is_locked == NULL) {
+    return kDifBadArg;
+  }
+
+  *is_locked = !mmio_region_read32(sysrst_ctrl->base_addr,
+                                   SYSRST_CTRL_REGWEN_REG_OFFSET);
+
+  return kDifOk;
+}

sw/device/lib/dif/dif_sysrst_ctrl_unittest.cc

diff --git a/sw/device/lib/dif/dif_sysrst_ctrl_unittest.cc b/sw/device/lib/dif/dif_sysrst_ctrl_unittest.cc
index 3d7da06..0a6bad9 100644
--- a/sw/device/lib/dif/dif_sysrst_ctrl_unittest.cc
+++ b/sw/device/lib/dif/dif_sysrst_ctrl_unittest.cc
@@ -599,5 +599,34 @@
   EXPECT_DIF_OK(dif_sysrst_ctrl_ulp_wakeup_clear_status(&sysrst_ctrl_));
 }
 
+class LockTest : public SysrstCtrlTest {};
+
+TEST_F(LockTest, NullArgs) { EXPECT_DIF_BADARG(dif_sysrst_ctrl_lock(nullptr)); }
+
+TEST_F(LockTest, Success) {
+  EXPECT_WRITE32(SYSRST_CTRL_REGWEN_REG_OFFSET, 0);
+  EXPECT_DIF_OK(dif_sysrst_ctrl_lock(&sysrst_ctrl_));
+}
+
+class IsLockedTest : public SysrstCtrlTest {};
+
+TEST_F(IsLockedTest, NullArgs) {
+  bool is_locked;
+  EXPECT_DIF_BADARG(dif_sysrst_ctrl_is_locked(nullptr, &is_locked));
+  EXPECT_DIF_BADARG(dif_sysrst_ctrl_is_locked(&sysrst_ctrl_, nullptr));
+  EXPECT_DIF_BADARG(dif_sysrst_ctrl_is_locked(nullptr, nullptr));
+}
+
+TEST_F(IsLockedTest, Success) {
+  bool is_locked;
+  EXPECT_READ32(SYSRST_CTRL_REGWEN_REG_OFFSET, 0);
+  EXPECT_DIF_OK(dif_sysrst_ctrl_is_locked(&sysrst_ctrl_, &is_locked));
+  EXPECT_TRUE(is_locked);
+
+  EXPECT_READ32(SYSRST_CTRL_REGWEN_REG_OFFSET, 1);
+  EXPECT_DIF_OK(dif_sysrst_ctrl_is_locked(&sysrst_ctrl_, &is_locked));
+  EXPECT_FALSE(is_locked);
+}
+
 }  // namespace
 }  // namespace dif_sysrst_ctrl_unittest