--- /dev/null
+/*
+ * 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,
+};
Code Review / kvmfornfv.git / blobdiff