From fe60f06dcdee82b41f47e56ccb99cced91f1d2ac Mon Sep 17 00:00:00 2001
From: Stephen Warren <swarren@nvidia.com>
Date: Tue, 13 Sep 2016 10:45:58 -0600
Subject: reset: implement a driver for the Tegra CAR

Implement a reset uclass driver for the Tegra CAR. This allows clients to
use standard reset APIs on Tegra. This device is intended to be
instantiated by the core Tegra CAR driver, rather than being instantiated
directly from DT. The implementation uses the existing custom Tegra-
specific reset APIs to avoid coupling the series with significant
refactoring of the existing Tegra clock/reset code.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
---
 drivers/reset/tegra-car-reset.c | 72 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 drivers/reset/tegra-car-reset.c

(limited to 'drivers/reset/tegra-car-reset.c')

diff --git a/drivers/reset/tegra-car-reset.c b/drivers/reset/tegra-car-reset.c
new file mode 100644
index 0000000000..3147a50853
--- /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,
+};
-- 
cgit