mirror of
https://github.com/torvalds/linux.git
synced 2025-04-09 14:45:27 +00:00
6b64fde5c1
Add System Controller Firmware(SCU) reset driver for i.MX8QM and i.MX8QXP. SCU Manage resets for peripherals such as MIPI CSI. Currently, support two reset sources: IMX_SC_R_CSI_0 and IMX_SC_R_CSI_1. Signed-off-by: Frank Li <Frank.Li@nxp.com> Link: https://lore.kernel.org/r/20250210-8qxp_camera-v3-2-324f5105accc@nxp.com Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright 2025 NXP
|
|
* Frank Li <Frank.Li@nxp.com>
|
|
*/
|
|
#include <linux/firmware/imx/svc/misc.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/reset-controller.h>
|
|
|
|
#include <dt-bindings/firmware/imx/rsrc.h>
|
|
|
|
struct imx_scu_reset {
|
|
struct reset_controller_dev rc;
|
|
struct imx_sc_ipc *ipc_handle;
|
|
};
|
|
|
|
static struct imx_scu_reset *to_imx_scu(struct reset_controller_dev *rc)
|
|
{
|
|
return container_of(rc, struct imx_scu_reset, rc);
|
|
}
|
|
|
|
struct imx_scu_id_map {
|
|
u32 resource_id;
|
|
u32 command_id;
|
|
};
|
|
|
|
static const struct imx_scu_id_map imx_scu_id_map[] = {
|
|
{ IMX_SC_R_CSI_0, IMX_SC_C_MIPI_RESET },
|
|
{ IMX_SC_R_CSI_1, IMX_SC_C_MIPI_RESET },
|
|
};
|
|
|
|
static int imx_scu_reset_assert(struct reset_controller_dev *rc, unsigned long id)
|
|
{
|
|
struct imx_scu_reset *priv = to_imx_scu(rc);
|
|
|
|
return imx_sc_misc_set_control(priv->ipc_handle, imx_scu_id_map[id].resource_id,
|
|
imx_scu_id_map[id].command_id, true);
|
|
}
|
|
|
|
static const struct reset_control_ops imx_scu_reset_ops = {
|
|
.assert = imx_scu_reset_assert,
|
|
};
|
|
|
|
static int imx_scu_xlate(struct reset_controller_dev *rc, const struct of_phandle_args *reset_spec)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < rc->nr_resets; i++)
|
|
if (reset_spec->args[0] == imx_scu_id_map[i].resource_id)
|
|
return i;
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int imx_scu_reset_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct imx_scu_reset *priv;
|
|
int ret;
|
|
|
|
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, &priv->rc);
|
|
|
|
ret = imx_scu_get_handle(&priv->ipc_handle);
|
|
if (ret)
|
|
return dev_err_probe(dev, ret, "sc_misc_MIPI get ipc handle failed!\n");
|
|
|
|
priv->rc.ops = &imx_scu_reset_ops;
|
|
priv->rc.owner = THIS_MODULE;
|
|
priv->rc.of_node = dev->of_node;
|
|
priv->rc.of_reset_n_cells = 1;
|
|
priv->rc.of_xlate = imx_scu_xlate;
|
|
priv->rc.nr_resets = ARRAY_SIZE(imx_scu_id_map);
|
|
|
|
return devm_reset_controller_register(dev, &priv->rc);
|
|
}
|
|
|
|
static const struct of_device_id imx_scu_reset_ids[] = {
|
|
{ .compatible = "fsl,imx-scu-reset", },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, imx_scu_reset_ids);
|
|
|
|
static struct platform_driver imx_scu_reset_driver = {
|
|
.probe = imx_scu_reset_probe,
|
|
.driver = {
|
|
.name = "scu-reset",
|
|
.of_match_table = imx_scu_reset_ids,
|
|
},
|
|
};
|
|
module_platform_driver(imx_scu_reset_driver);
|
|
|
|
MODULE_AUTHOR("Frank Li <Frank.Li@nxp.com>");
|
|
MODULE_DESCRIPTION("i.MX scu reset driver");
|
|
MODULE_LICENSE("GPL");
|