sysreset: Add TI System Control Interface (TI SCI) sysreset driver
Devices from the TI K3 family of SoCs like the AM654x contain a Device
Management and Security Controller (SYSFW) that manages the low-level
device control (like clocks, resets etc) for the various hardware
modules present on the SoC. These device control operations are provided
to the host processor OS through a communication protocol called the TI
System Control Interface (TI SCI) protocol.
This patch adds a system reset driver that communicates to the system
controller over the TI SCI protocol for allowing to perform a system-
wide SoC reset.
Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/drivers/sysreset/sysreset-ti-sci.c b/drivers/sysreset/sysreset-ti-sci.c
new file mode 100644
index 0000000..890a607
--- /dev/null
+++ b/drivers/sysreset/sysreset-ti-sci.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Texas Instruments System Control Interface (TI SCI) system reset driver
+ *
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ * Andreas Dannenberg <dannenberg@ti.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <sysreset.h>
+#include <linux/soc/ti/ti_sci_protocol.h>
+
+/**
+ * struct ti_sci_sysreset_data - sysreset controller information structure
+ * @sci: TI SCI handle used for communication with system controller
+ */
+struct ti_sci_sysreset_data {
+ const struct ti_sci_handle *sci;
+};
+
+static int ti_sci_sysreset_probe(struct udevice *dev)
+{
+ struct ti_sci_sysreset_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_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+ struct ti_sci_sysreset_data *data = dev_get_priv(dev);
+ const struct ti_sci_handle *sci = data->sci;
+ const struct ti_sci_core_ops *cops = &sci->ops.core_ops;
+ int ret;
+
+ debug("%s(dev=%p, type=%d)\n", __func__, dev, type);
+
+ ret = cops->reboot_device(sci);
+ if (ret)
+ dev_err(rst->dev, "%s: reboot_device failed (%d)\n",
+ __func__, ret);
+
+ return ret;
+}
+
+static struct sysreset_ops ti_sci_sysreset_ops = {
+ .request = ti_sci_sysreset_request,
+};
+
+static const struct udevice_id ti_sci_sysreset_of_match[] = {
+ { .compatible = "ti,sci-sysreset", },
+ { /* sentinel */ },
+};
+
+U_BOOT_DRIVER(ti_sci_sysreset) = {
+ .name = "ti-sci-sysreset",
+ .id = UCLASS_SYSRESET,
+ .of_match = ti_sci_sysreset_of_match,
+ .probe = ti_sci_sysreset_probe,
+ .priv_auto_alloc_size = sizeof(struct ti_sci_sysreset_data),
+ .ops = &ti_sci_sysreset_ops,
+};