dany/u-boot-megous
1
0
Fork 0
mirror of https://xff.cz/git/u-boot/ synced 2025-09-01 16:52:14 +02:00
Code Issues Packages Projects Releases Wiki Activity

sysreset: Add TI System Control Interface (TI SCI) sysreset driver

Browse Source 
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>
This commit is contained in:
Andreas Dannenberg
2018-08-27 15:57:46 +05:30
committed by Tom Rini
parent 1a88a04e9f
commit 694b052401
4 changed files with 110 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

73
drivers/sysreset/sysreset-ti-sci.c Normal file
View File

@@ -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,
};