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@@ -0,0 +1,128 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Copyright (c), Vaisala Oyj
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+ */
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+
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+#include <common.h>
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+#include <asm/gpio.h>
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+#include <dm.h>
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+#include <dm/devres.h>
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+#include <errno.h>
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+#include <reboot-mode/reboot-mode-gpio.h>
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+#include <reboot-mode/reboot-mode.h>
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+
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+DECLARE_GLOBAL_DATA_PTR;
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+
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+static int reboot_mode_get(struct udevice *dev, u32 *buf)
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+{
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+ int ret;
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+ struct reboot_mode_gpio_platdata *plat_data;
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+
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+ if (!buf)
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+ return -EINVAL;
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+
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+ plat_data = dev_get_plat(dev);
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+ if (!plat_data)
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+ return -EINVAL;
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+
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+ ret = dm_gpio_get_values_as_int(plat_data->gpio_desc,
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+ plat_data->gpio_count);
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+ if (ret < 0)
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+ return ret;
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+
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+ *buf = ret;
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+
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+ return 0;
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+}
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+
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+static int reboot_mode_probe(struct udevice *dev)
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+{
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+ struct reboot_mode_gpio_platdata *plat_data;
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+
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+ plat_data = dev_get_plat(dev);
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+ if (!plat_data)
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+ return -EINVAL;
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+
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+ int ret;
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+
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+#if CONFIG_IS_ENABLED(OF_CONTROL)
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+ ret = gpio_get_list_count(dev, "gpios");
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+ if (ret < 0)
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+ return ret;
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+
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+ plat_data->gpio_count = ret;
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+#endif
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+
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+ if (plat_data->gpio_count <= 0)
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+ return -EINVAL;
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+
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+ plat_data->gpio_desc = devm_kcalloc(dev, plat_data->gpio_count,
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+ sizeof(struct gpio_desc), 0);
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+ if (!plat_data->gpio_desc)
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+ return -ENOMEM;
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+
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+#if CONFIG_IS_ENABLED(OF_CONTROL)
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+ ret = gpio_request_list_by_name(dev, "gpios", plat_data->gpio_desc,
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+ plat_data->gpio_count, GPIOD_IS_IN);
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+ if (ret < 0)
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+ return ret;
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+#else
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+ for (int i = 0; i < plat_data->gpio_count; i++) {
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+ struct reboot_mode_gpio_config *gpio =
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+ plat_data->gpios_config + i;
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+ struct gpio_desc *desc = plat_data->gpio_desc + i;
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+
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+ ret = uclass_get_device_by_seq(UCLASS_GPIO,
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+ gpio->gpio_dev_offset,
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+ &desc->dev);
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+ if (ret < 0)
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+ return ret;
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+
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+ desc->flags = gpio->flags;
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+ desc->offset = gpio->gpio_offset;
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+
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+ ret = dm_gpio_request(desc, "");
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+ if (ret < 0)
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+ return ret;
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+
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+ ret = dm_gpio_set_dir(desc);
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+ if (ret < 0)
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+ return ret;
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+ }
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+#endif
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+ return 0;
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+}
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+
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+static int reboot_mode_remove(struct udevice *dev)
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+{
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+ struct reboot_mode_gpio_platdata *plat_data;
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+
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+ plat_data = dev_get_plat(dev);
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+ if (!plat_data)
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+ return -EINVAL;
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+
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+ return gpio_free_list(dev, plat_data->gpio_desc, plat_data->gpio_count);
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+}
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+
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+#if CONFIG_IS_ENABLED(OF_CONTROL)
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+static const struct udevice_id reboot_mode_ids[] = {
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+ { .compatible = "reboot-mode-gpio", 0 },
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+ { }
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+};
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+#endif
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+
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+static const struct reboot_mode_ops reboot_mode_gpio_ops = {
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+ .get = reboot_mode_get,
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+};
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+
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+U_BOOT_DRIVER(reboot_mode_gpio) = {
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+ .name = "reboot-mode-gpio",
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+ .id = UCLASS_REBOOT_MODE,
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+ .probe = reboot_mode_probe,
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+ .remove = reboot_mode_remove,
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+#if CONFIG_IS_ENABLED(OF_CONTROL)
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+ .of_match = reboot_mode_ids,
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+#endif
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+ .plat_auto = sizeof(struct reboot_mode_gpio_platdata),
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+ .ops = &reboot_mode_gpio_ops,
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+};
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