gpio: add Tegra186 GPIO driver

Tegra186's GPIO controller register layout is significantly different from
previous chips, so add a new driver for it. In fact, there are two
different GPIO controllers in Tegra186 that share a similar register
layout, but very different port mapping. This driver covers both.

The DT binding is already present in the Linux kernel (in linux-next via
the Tegra tree so far).

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org> # v1
Signed-off-by: Tom Warren <twarren@nvidia.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/drivers/gpio/tegra186_gpio_priv.h b/drivers/gpio/tegra186_gpio_priv.h
new file mode 100644
index 0000000000..9e85a4343b
--- /dev/null
+++ b/drivers/gpio/tegra186_gpio_priv.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#ifndef _TEGRA186_GPIO_PRIV_H_
+#define _TEGRA186_GPIO_PRIV_H_
+
+/*
+ * For each GPIO, there are a set of registers than affect it, all packed
+ * back-to-back.
+ */
+#define TEGRA186_GPIO_ENABLE_CONFIG				0x00
+#define TEGRA186_GPIO_ENABLE_CONFIG_ENABLE			BIT(0)
+#define TEGRA186_GPIO_ENABLE_CONFIG_OUT				BIT(1)
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SHIFT		2
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_MASK		3
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_NONE		0
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_LEVEL		1
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE	2
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_DOUBLE_EDGE	3
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL_HIGH_RISING	BIT(4)
+#define TEGRA186_GPIO_ENABLE_CONFIG_DEBOUNCE_ENABLE		BIT(5)
+#define TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT_ENABLE		BIT(6)
+#define TEGRA186_GPIO_ENABLE_CONFIG_TIMESTAMPING_ENABLE		BIT(7)
+
+#define TEGRA186_GPIO_DEBOUNCE_THRESHOLD			0x04
+
+#define TEGRA186_GPIO_INPUT					0x08
+
+#define TEGRA186_GPIO_OUTPUT_CONTROL				0x0c
+#define TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED			BIT(0)
+
+#define TEGRA186_GPIO_OUTPUT_VALUE				0x10
+#define TEGRA186_GPIO_OUTPUT_VALUE_HIGH				1
+
+#define TEGRA186_GPIO_INTERRUPT_CLEAR				0x14
+
+/*
+ * 8 GPIOs are packed into a port. Their registers appear back-to-back in the
+ * port's address space.
+ */
+#define TEGRA186_GPIO_PER_GPIO_STRIDE				0x20
+#define TEGRA186_GPIO_PER_GPIO_COUNT				8
+
+/*
+ * Per-port registers are packed immediately following all of a port's
+ * per-GPIO registers.
+ */
+#define TEGRA186_GPIO_INTERRUPT_STATUS_G			0x100
+#define TEGRA186_GPIO_INTERRUPT_STATUS_G_STRIDE			4
+#define TEGRA186_GPIO_INTERRUPT_STATUS_G_COUNT			8
+
+/*
+ * The registers for multiple ports are packed together back-to-back to form
+ * the overall controller.
+ */
+#define TEGRA186_GPIO_PER_PORT_STRIDE				0x200
+
+#endif