1 files changed, 254 insertions, 0 deletions

diff --git a/qemu/roms/u-boot/drivers/gpio/sandbox.c b/qemu/roms/u-boot/drivers/gpio/sandbox.c
new file mode 100644
index 000000000..22b6a5f79
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/gpio/sandbox.c
@@ -0,0 +1,254 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <asm/gpio.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Flags for each GPIO */
+#define GPIOF_OUTPUT	(1 << 0)	/* Currently set as an output */
+#define GPIOF_HIGH	(1 << 1)	/* Currently set high */
+#define GPIOF_RESERVED	(1 << 2)	/* Is in use / requested */
+
+struct gpio_state {
+	const char *label;	/* label given by requester */
+	u8 flags;		/* flags (GPIOF_...) */
+};
+
+/* Access routines for GPIO state */
+static u8 *get_gpio_flags(struct device *dev, unsigned offset)
+{
+	struct gpio_dev_priv *uc_priv = dev->uclass_priv;
+	struct gpio_state *state = dev_get_priv(dev);
+
+	if (offset >= uc_priv->gpio_count) {
+		static u8 invalid_flags;
+		printf("sandbox_gpio: error: invalid gpio %u\n", offset);
+		return &invalid_flags;
+	}
+
+	return &state[offset].flags;
+}
+
+static int get_gpio_flag(struct device *dev, unsigned offset, int flag)
+{
+	return (*get_gpio_flags(dev, offset) & flag) != 0;
+}
+
+static int set_gpio_flag(struct device *dev, unsigned offset, int flag,
+			 int value)
+{
+	u8 *gpio = get_gpio_flags(dev, offset);
+
+	if (value)
+		*gpio |= flag;
+	else
+		*gpio &= ~flag;
+
+	return 0;
+}
+
+static int check_reserved(struct device *dev, unsigned offset,
+			  const char *func)
+{
+	if (!get_gpio_flag(dev, offset, GPIOF_RESERVED)) {
+		printf("sandbox_gpio: %s: error: offset %u not reserved\n",
+		       func, offset);
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * Back-channel sandbox-internal-only access to GPIO state
+ */
+
+int sandbox_gpio_get_value(struct device *dev, unsigned offset)
+{
+	if (get_gpio_flag(dev, offset, GPIOF_OUTPUT))
+		debug("sandbox_gpio: get_value on output gpio %u\n", offset);
+	return get_gpio_flag(dev, offset, GPIOF_HIGH);
+}
+
+int sandbox_gpio_set_value(struct device *dev, unsigned offset, int value)
+{
+	return set_gpio_flag(dev, offset, GPIOF_HIGH, value);
+}
+
+int sandbox_gpio_get_direction(struct device *dev, unsigned offset)
+{
+	return get_gpio_flag(dev, offset, GPIOF_OUTPUT);
+}
+
+int sandbox_gpio_set_direction(struct device *dev, unsigned offset, int output)
+{
+	return set_gpio_flag(dev, offset, GPIOF_OUTPUT, output);
+}
+
+/*
+ * These functions implement the public interface within U-Boot
+ */
+
+/* set GPIO port 'offset' as an input */
+static int sb_gpio_direction_input(struct device *dev, unsigned offset)
+{
+	debug("%s: offset:%u\n", __func__, offset);
+
+	if (check_reserved(dev, offset, __func__))
+		return -1;
+
+	return sandbox_gpio_set_direction(dev, offset, 0);
+}
+
+/* set GPIO port 'offset' as an output, with polarity 'value' */
+static int sb_gpio_direction_output(struct device *dev, unsigned offset,
+				    int value)
+{
+	debug("%s: offset:%u, value = %d\n", __func__, offset, value);
+
+	if (check_reserved(dev, offset, __func__))
+		return -1;
+
+	return sandbox_gpio_set_direction(dev, offset, 1) |
+		sandbox_gpio_set_value(dev, offset, value);
+}
+
+/* read GPIO IN value of port 'offset' */
+static int sb_gpio_get_value(struct device *dev, unsigned offset)
+{
+	debug("%s: offset:%u\n", __func__, offset);
+
+	if (check_reserved(dev, offset, __func__))
+		return -1;
+
+	return sandbox_gpio_get_value(dev, offset);
+}
+
+/* write GPIO OUT value to port 'offset' */
+static int sb_gpio_set_value(struct device *dev, unsigned offset, int value)
+{
+	debug("%s: offset:%u, value = %d\n", __func__, offset, value);
+
+	if (check_reserved(dev, offset, __func__))
+		return -1;
+
+	if (!sandbox_gpio_get_direction(dev, offset)) {
+		printf("sandbox_gpio: error: set_value on input gpio %u\n",
+		       offset);
+		return -1;
+	}
+
+	return sandbox_gpio_set_value(dev, offset, value);
+}
+
+static int sb_gpio_request(struct device *dev, unsigned offset,
+			   const char *label)
+{
+	struct gpio_dev_priv *uc_priv = dev->uclass_priv;
+	struct gpio_state *state = dev_get_priv(dev);
+
+	debug("%s: offset:%u, label:%s\n", __func__, offset, label);
+
+	if (offset >= uc_priv->gpio_count) {
+		printf("sandbox_gpio: error: invalid gpio %u\n", offset);
+		return -1;
+	}
+
+	if (get_gpio_flag(dev, offset, GPIOF_RESERVED)) {
+		printf("sandbox_gpio: error: gpio %u already reserved\n",
+		       offset);
+		return -1;
+	}
+
+	state[offset].label = label;
+	return set_gpio_flag(dev, offset, GPIOF_RESERVED, 1);
+}
+
+static int sb_gpio_free(struct device *dev, unsigned offset)
+{
+	struct gpio_state *state = dev_get_priv(dev);
+
+	debug("%s: offset:%u\n", __func__, offset);
+
+	if (check_reserved(dev, offset, __func__))
+		return -1;
+
+	state[offset].label = NULL;
+	return set_gpio_flag(dev, offset, GPIOF_RESERVED, 0);
+}
+
+static int sb_gpio_get_state(struct device *dev, unsigned int offset,
+			     char *buf, int bufsize)
+{
+	struct gpio_dev_priv *uc_priv = dev->uclass_priv;
+	struct gpio_state *state = dev_get_priv(dev);
+	const char *label;
+
+	label = state[offset].label;
+	snprintf(buf, bufsize, "%s%d: %s: %d [%c]%s%s",
+		 uc_priv->bank_name ? uc_priv->bank_name : "", offset,
+		 sandbox_gpio_get_direction(dev, offset) ? "out" : " in",
+		 sandbox_gpio_get_value(dev, offset),
+		 get_gpio_flag(dev, offset, GPIOF_RESERVED) ? 'x' : ' ',
+		 label ? " " : "",
+		 label ? label : "");
+
+	return 0;
+}
+
+static const struct dm_gpio_ops gpio_sandbox_ops = {
+	.request		= sb_gpio_request,
+	.free			= sb_gpio_free,
+	.direction_input	= sb_gpio_direction_input,
+	.direction_output	= sb_gpio_direction_output,
+	.get_value		= sb_gpio_get_value,
+	.set_value		= sb_gpio_set_value,
+	.get_state		= sb_gpio_get_state,
+};
+
+static int sandbox_gpio_ofdata_to_platdata(struct device *dev)
+{
+	struct gpio_dev_priv *uc_priv = dev->uclass_priv;
+
+	uc_priv->gpio_count = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+					     "num-gpios", 0);
+	uc_priv->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset,
+					 "gpio-bank-name", NULL);
+
+	return 0;
+}
+
+static int gpio_sandbox_probe(struct device *dev)
+{
+	struct gpio_dev_priv *uc_priv = dev->uclass_priv;
+
+	if (dev->of_offset == -1) {
+		/* Tell the uclass how many GPIOs we have */
+		uc_priv->gpio_count = CONFIG_SANDBOX_GPIO_COUNT;
+	}
+
+	dev->priv = calloc(sizeof(struct gpio_state), uc_priv->gpio_count);
+
+	return 0;
+}
+
+static const struct device_id sandbox_gpio_ids[] = {
+	{ .compatible = "sandbox,gpio" },
+	{ }
+};
+
+U_BOOT_DRIVER(gpio_sandbox) = {
+	.name	= "gpio_sandbox",
+	.id	= UCLASS_GPIO,
+	.of_match = sandbox_gpio_ids,
+	.ofdata_to_platdata = sandbox_gpio_ofdata_to_platdata,
+	.probe	= gpio_sandbox_probe,
+	.ops	= &gpio_sandbox_ops,
+};