3 files changed, 80 insertions, 0 deletions
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 5b84f2178b7..4fcc0d95b4f 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -20,6 +20,13 @@ config SANDBOX_RESET
 	  simply accepts requests to reset various HW modules without actually
 	  doing anything beyond a little error checking.
 
+config TEGRA_CAR_RESET
+	bool "Enable Tegra CAR-based reset driver"
+	depends on TEGRA_CAR
+	help
+	  Enable support for manipulating Tegra's on-SoC reset signals via
+	  direct register access to the Tegra CAR (Clock And Reset controller).
+
 config TEGRA186_RESET
 	bool "Enable Tegra186 BPMP-based reset driver"
 	depends on TEGRA186_BPMP
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index ff0e0907758..5d4ea3d79dc 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -5,4 +5,5 @@
 obj-$(CONFIG_DM_RESET) += reset-uclass.o
 obj-$(CONFIG_SANDBOX_MBOX) += sandbox-reset.o
 obj-$(CONFIG_SANDBOX_MBOX) += sandbox-reset-test.o
+obj-$(CONFIG_TEGRA_CAR_RESET) += tegra-car-reset.o
 obj-$(CONFIG_TEGRA186_RESET) += tegra186-reset.o
diff --git a/drivers/reset/tegra-car-reset.c b/drivers/reset/tegra-car-reset.c
new file mode 100644
index 00000000000..3147a50853a
--- /dev/null
+++ b/drivers/reset/tegra-car-reset.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <reset-uclass.h>
+#include <asm/arch/clock.h>
+#include <asm/arch-tegra/clk_rst.h>
+
+static int tegra_car_reset_request(struct reset_ctl *reset_ctl)
+{
+	debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
+	      reset_ctl->dev, reset_ctl->id);
+
+	/* PERIPH_ID_COUNT varies per SoC */
+	if (reset_ctl->id >= PERIPH_ID_COUNT)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int tegra_car_reset_free(struct reset_ctl *reset_ctl)
+{
+	debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
+	      reset_ctl->dev, reset_ctl->id);
+
+	return 0;
+}
+
+static int tegra_car_reset_assert(struct reset_ctl *reset_ctl)
+{
+	debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
+	      reset_ctl->dev, reset_ctl->id);
+
+	reset_set_enable(reset_ctl->id, 1);
+
+	return 0;
+}
+
+static int tegra_car_reset_deassert(struct reset_ctl *reset_ctl)
+{
+	debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
+	      reset_ctl->dev, reset_ctl->id);
+
+	reset_set_enable(reset_ctl->id, 0);
+
+	return 0;
+}
+
+struct reset_ops tegra_car_reset_ops = {
+	.request = tegra_car_reset_request,
+	.free = tegra_car_reset_free,
+	.rst_assert = tegra_car_reset_assert,
+	.rst_deassert = tegra_car_reset_deassert,
+};
+
+static int tegra_car_reset_probe(struct udevice *dev)
+{
+	debug("%s(dev=%p)\n", __func__, dev);
+
+	return 0;
+}
+
+U_BOOT_DRIVER(tegra_car_reset) = {
+	.name = "tegra_car_reset",
+	.id = UCLASS_RESET,
+	.probe = tegra_car_reset_probe,
+	.ops = &tegra_car_reset_ops,
+};