1 files changed, 107 insertions, 0 deletions
diff --git a/drivers/power/domain/ti-sci-power-domain.c b/drivers/power/domain/ti-sci-power-domain.c
new file mode 100644
index 0000000..aafde62
--- /dev/null
+++ b/drivers/power/domain/ti-sci-power-domain.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Texas Instruments System Control Interface (TI SCI) power domain driver
+ *
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ *	Andreas Dannenberg <dannenberg@ti.com>
+ *
+ * Loosely based on Linux kernel ti_sci_pm_domains.c...
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <power-domain-uclass.h>
+#include <linux/soc/ti/ti_sci_protocol.h>
+
+/**
+ * struct ti_sci_power_domain_data - pm domain controller information structure
+ * @sci: TI SCI handle used for communication with system controller
+ */
+struct ti_sci_power_domain_data {
+	const struct ti_sci_handle *sci;
+};
+
+static int ti_sci_power_domain_probe(struct udevice *dev)
+{
+	struct ti_sci_power_domain_data *data = dev_get_priv(dev);
+
+	debug("%s(dev=%p)\n", __func__, dev);
+
+	if (!data)
+		return -ENOMEM;
+
+	/* Store handle for communication with the system controller */
+	data->sci = ti_sci_get_handle(dev);
+	if (IS_ERR(data->sci))
+		return PTR_ERR(data->sci);
+
+	return 0;
+}
+
+static int ti_sci_power_domain_request(struct power_domain *pd)
+{
+	debug("%s(pd=%p)\n", __func__, pd);
+	return 0;
+}
+
+static int ti_sci_power_domain_free(struct power_domain *pd)
+{
+	debug("%s(pd=%p)\n", __func__, pd);
+	return 0;
+}
+
+static int ti_sci_power_domain_on(struct power_domain *pd)
+{
+	struct ti_sci_power_domain_data *data = dev_get_priv(pd->dev);
+	const struct ti_sci_handle *sci = data->sci;
+	const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops;
+	int ret;
+
+	debug("%s(pd=%p)\n", __func__, pd);
+
+	ret = dops->get_device(sci, pd->id);
+	if (ret)
+		dev_err(power_domain->dev, "%s: get_device failed (%d)\n",
+			__func__, ret);
+
+	return ret;
+}
+
+static int ti_sci_power_domain_off(struct power_domain *pd)
+{
+	struct ti_sci_power_domain_data *data = dev_get_priv(pd->dev);
+	const struct ti_sci_handle *sci = data->sci;
+	const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops;
+	int ret;
+
+	debug("%s(pd=%p)\n", __func__, pd);
+
+	ret = dops->put_device(sci, pd->id);
+	if (ret)
+		dev_err(power_domain->dev, "%s: put_device failed (%d)\n",
+			__func__, ret);
+
+	return ret;
+}
+
+static const struct udevice_id ti_sci_power_domain_of_match[] = {
+	{ .compatible = "ti,sci-pm-domain" },
+	{ /* sentinel */ }
+};
+
+static struct power_domain_ops ti_sci_power_domain_ops = {
+	.request = ti_sci_power_domain_request,
+	.free = ti_sci_power_domain_free,
+	.on = ti_sci_power_domain_on,
+	.off = ti_sci_power_domain_off,
+};
+
+U_BOOT_DRIVER(ti_sci_pm_domains) = {
+	.name = "ti-sci-pm-domains",
+	.id = UCLASS_POWER_DOMAIN,
+	.of_match = ti_sci_power_domain_of_match,
+	.probe = ti_sci_power_domain_probe,
+	.priv_auto_alloc_size = sizeof(struct ti_sci_power_domain_data),
+	.ops = &ti_sci_power_domain_ops,
+};