[linux-block.git] / drivers / thermal / imx_sc_thermal.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2018-2020 NXP.
 */

#include <dt-bindings/firmware/imx/rsrc.h>
#include <linux/err.h>
#include <linux/firmware/imx/sci.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/thermal.h>

#include "thermal_hwmon.h"

#define IMX_SC_MISC_FUNC_GET_TEMP	13

static struct imx_sc_ipc *thermal_ipc_handle;

struct imx_sc_sensor {
	struct thermal_zone_device *tzd;
	u32 resource_id;
};

struct req_get_temp {
	u16 resource_id;
	u8 type;
} __packed __aligned(4);

struct resp_get_temp {
	s16 celsius;
	s8 tenths;
} __packed __aligned(4);

struct imx_sc_msg_misc_get_temp {
	struct imx_sc_rpc_msg hdr;
	union {
		struct req_get_temp req;
		struct resp_get_temp resp;
	} data;
} __packed __aligned(4);

static int imx_sc_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
{
	struct imx_sc_msg_misc_get_temp msg;
	struct imx_sc_rpc_msg *hdr = &msg.hdr;
	struct imx_sc_sensor *sensor = thermal_zone_device_priv(tz);
	int ret;

	msg.data.req.resource_id = sensor->resource_id;
	msg.data.req.type = IMX_SC_C_TEMP;

	hdr->ver = IMX_SC_RPC_VERSION;
	hdr->svc = IMX_SC_RPC_SVC_MISC;
	hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
	hdr->size = 2;

	ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
	if (ret)
		return ret;

	*temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;

	return 0;
}

static const struct thermal_zone_device_ops imx_sc_thermal_ops = {
	.get_temp = imx_sc_thermal_get_temp,
};

static int imx_sc_thermal_probe(struct platform_device *pdev)
{
	struct imx_sc_sensor *sensor;
	const int *resource_id;
	int i, ret;

	ret = imx_scu_get_handle(&thermal_ipc_handle);
	if (ret)
		return ret;

	resource_id = of_device_get_match_data(&pdev->dev);
	if (!resource_id)
		return -EINVAL;

	for (i = 0; resource_id[i] >= 0; i++) {

		sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
		if (!sensor)
			return -ENOMEM;

		sensor->resource_id = resource_id[i];

		sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,
							    sensor, &imx_sc_thermal_ops);
		if (IS_ERR(sensor->tzd)) {
			/*
			 * Save the error value before freeing the
			 * sensor pointer, otherwise we endup with a
			 * use-after-free error
			 */
			ret = PTR_ERR(sensor->tzd);

			devm_kfree(&pdev->dev, sensor);

			/*
			 * The thermal framework notifies us there is
			 * no thermal zone description for such a
			 * sensor id
			 */
			if (ret == -ENODEV)
				continue;

			dev_err(&pdev->dev, "failed to register thermal zone\n");
			return ret;
		}

		if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
			dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
	}

	return 0;
}

static const int imx_sc_sensors[] = {
	IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0,
	IMX_SC_R_AP_0, IMX_SC_R_AP_1,
	IMX_SC_R_GPU_0_PID0, IMX_SC_R_GPU_1_PID0,
	IMX_SC_R_DRC_0, -1 };

static const struct of_device_id imx_sc_thermal_table[] = {
	{ .compatible = "fsl,imx-sc-thermal", .data =  imx_sc_sensors },
	{}
};
MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);

static struct platform_driver imx_sc_thermal_driver = {
		.probe = imx_sc_thermal_probe,
		.driver = {
			.name = "imx-sc-thermal",
			.of_match_table = imx_sc_thermal_table,
		},
};
module_platform_driver(imx_sc_thermal_driver);

MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
e20db70d AH	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Copyright 2018-2020 NXP.
	4	*/
	5
755a7397	6	#include <dt-bindings/firmware/imx/rsrc.h>
e20db70d AH	7	#include <linux/err.h>
e20db70d AH	8	#include <linux/firmware/imx/sci.h>
e20db70d AH	9	#include <linux/module.h>
	10	#include <linux/of.h>
	11	#include <linux/of_device.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/slab.h>
	14	#include <linux/thermal.h>
	15
d2bc4dd9	16	#include "thermal_hwmon.h"
e20db70d AH	17
	18	#define IMX_SC_MISC_FUNC_GET_TEMP 13
	19
	20	static struct imx_sc_ipc *thermal_ipc_handle;
	21
	22	struct imx_sc_sensor {
	23	struct thermal_zone_device *tzd;
	24	u32 resource_id;
	25	};
	26
	27	struct req_get_temp {
	28	u16 resource_id;
	29	u8 type;
1fd213f3	30	} __packed __aligned(4);
e20db70d AH	31
e20db70d AH	32	struct resp_get_temp {
968ea0df AH	33	s16 celsius;
968ea0df AH	34	s8 tenths;
1fd213f3	35	} __packed __aligned(4);
e20db70d AH	36
	37	struct imx_sc_msg_misc_get_temp {
	38	struct imx_sc_rpc_msg hdr;
	39	union {
	40	struct req_get_temp req;
	41	struct resp_get_temp resp;
	42	} data;
1fd213f3	43	} __packed __aligned(4);
e20db70d	44
32fb9a8a	45	static int imx_sc_thermal_get_temp(struct thermal_zone_device tz, int temp)
e20db70d AH	46	{
	47	struct imx_sc_msg_misc_get_temp msg;
	48	struct imx_sc_rpc_msg *hdr = &msg.hdr;
5f68d078	49	struct imx_sc_sensor *sensor = thermal_zone_device_priv(tz);
e20db70d AH	50	int ret;
	51
	52	msg.data.req.resource_id = sensor->resource_id;
	53	msg.data.req.type = IMX_SC_C_TEMP;
	54
	55	hdr->ver = IMX_SC_RPC_VERSION;
	56	hdr->svc = IMX_SC_RPC_SVC_MISC;
	57	hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
	58	hdr->size = 2;
	59
	60	ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
abda7383	61	if (ret)
e20db70d	62	return ret;
e20db70d AH	63
	64	temp = msg.data.resp.celsius 1000 + msg.data.resp.tenths * 100;
	65
	66	return 0;
	67	}
	68
32fb9a8a	69	static const struct thermal_zone_device_ops imx_sc_thermal_ops = {
e20db70d AH	70	.get_temp = imx_sc_thermal_get_temp,
	71	};
	72
	73	static int imx_sc_thermal_probe(struct platform_device *pdev)
	74	{
e20db70d	75	struct imx_sc_sensor *sensor;
31fd4b9d DL	76	const int *resource_id;
31fd4b9d DL	77	int i, ret;
e20db70d AH	78
	79	ret = imx_scu_get_handle(&thermal_ipc_handle);
	80	if (ret)
	81	return ret;
	82
31fd4b9d DL	83	resource_id = of_device_get_match_data(&pdev->dev);
	84	if (!resource_id)
	85	return -EINVAL;
e20db70d	86
4b26b7c9	87	for (i = 0; resource_id[i] >= 0; i++) {
e20db70d	88
e20db70d	89	sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
31fd4b9d DL	90	if (!sensor)
31fd4b9d DL	91	return -ENOMEM;
e20db70d	92
31fd4b9d	93	sensor->resource_id = resource_id[i];
e20db70d	94
31fd4b9d DL	95	sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,
31fd4b9d DL	96	sensor, &imx_sc_thermal_ops);
e20db70d	97	if (IS_ERR(sensor->tzd)) {
31fd4b9d DL	98	/*
	99	* Save the error value before freeing the
	100	* sensor pointer, otherwise we endup with a
	101	* use-after-free error
	102	*/
e20db70d	103	ret = PTR_ERR(sensor->tzd);
31fd4b9d DL	104
	105	devm_kfree(&pdev->dev, sensor);
	106
	107	/*
	108	* The thermal framework notifies us there is
	109	* no thermal zone description for such a
	110	* sensor id
	111	*/
	112	if (ret == -ENODEV)
	113	continue;
	114
	115	dev_err(&pdev->dev, "failed to register thermal zone\n");
	116	return ret;
e20db70d	117	}
d2bc4dd9 AH	118
	119	if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
	120	dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
e20db70d AH	121	}
e20db70d AH	122
31fd4b9d	123	return 0;
e20db70d AH	124	}
e20db70d AH	125
1cea9959 VS	126	static const int imx_sc_sensors[] = {
	127	IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0,
	128	IMX_SC_R_AP_0, IMX_SC_R_AP_1,
	129	IMX_SC_R_GPU_0_PID0, IMX_SC_R_GPU_1_PID0,
	130	IMX_SC_R_DRC_0, -1 };
31fd4b9d	131
e20db70d	132	static const struct of_device_id imx_sc_thermal_table[] = {
31fd4b9d	133	{ .compatible = "fsl,imx-sc-thermal", .data = imx_sc_sensors },
e20db70d AH	134	{}
	135	};
	136	MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
	137
	138	static struct platform_driver imx_sc_thermal_driver = {
	139	.probe = imx_sc_thermal_probe,
e20db70d AH	140	.driver = {
	141	.name = "imx-sc-thermal",
	142	.of_match_table = imx_sc_thermal_table,
	143	},
	144	};
	145	module_platform_driver(imx_sc_thermal_driver);
	146
	147	MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
	148	MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
	149	MODULE_LICENSE("GPL v2");