cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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imx_sc_thermal.c (3589B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * Copyright 2018-2020 NXP.
      4 */
      5
      6#include <dt-bindings/firmware/imx/rsrc.h>
      7#include <linux/err.h>
      8#include <linux/firmware/imx/sci.h>
      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
     16#include "thermal_core.h"
     17#include "thermal_hwmon.h"
     18
     19#define IMX_SC_MISC_FUNC_GET_TEMP	13
     20
     21static struct imx_sc_ipc *thermal_ipc_handle;
     22
     23struct imx_sc_sensor {
     24	struct thermal_zone_device *tzd;
     25	u32 resource_id;
     26};
     27
     28struct req_get_temp {
     29	u16 resource_id;
     30	u8 type;
     31} __packed __aligned(4);
     32
     33struct resp_get_temp {
     34	s16 celsius;
     35	s8 tenths;
     36} __packed __aligned(4);
     37
     38struct imx_sc_msg_misc_get_temp {
     39	struct imx_sc_rpc_msg hdr;
     40	union {
     41		struct req_get_temp req;
     42		struct resp_get_temp resp;
     43	} data;
     44} __packed __aligned(4);
     45
     46static int imx_sc_thermal_get_temp(void *data, int *temp)
     47{
     48	struct imx_sc_msg_misc_get_temp msg;
     49	struct imx_sc_rpc_msg *hdr = &msg.hdr;
     50	struct imx_sc_sensor *sensor = data;
     51	int ret;
     52
     53	msg.data.req.resource_id = sensor->resource_id;
     54	msg.data.req.type = IMX_SC_C_TEMP;
     55
     56	hdr->ver = IMX_SC_RPC_VERSION;
     57	hdr->svc = IMX_SC_RPC_SVC_MISC;
     58	hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
     59	hdr->size = 2;
     60
     61	ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
     62	if (ret) {
     63		dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n",
     64			sensor->resource_id, ret);
     65		return ret;
     66	}
     67
     68	*temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
     69
     70	return 0;
     71}
     72
     73static const struct thermal_zone_of_device_ops imx_sc_thermal_ops = {
     74	.get_temp = imx_sc_thermal_get_temp,
     75};
     76
     77static int imx_sc_thermal_probe(struct platform_device *pdev)
     78{
     79	struct device_node *np, *child, *sensor_np;
     80	struct imx_sc_sensor *sensor;
     81	int ret;
     82
     83	ret = imx_scu_get_handle(&thermal_ipc_handle);
     84	if (ret)
     85		return ret;
     86
     87	np = of_find_node_by_name(NULL, "thermal-zones");
     88	if (!np)
     89		return -ENODEV;
     90
     91	sensor_np = of_node_get(pdev->dev.of_node);
     92
     93	for_each_available_child_of_node(np, child) {
     94		sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
     95		if (!sensor) {
     96			of_node_put(child);
     97			ret = -ENOMEM;
     98			goto put_node;
     99		}
    100
    101		ret = thermal_zone_of_get_sensor_id(child,
    102						    sensor_np,
    103						    &sensor->resource_id);
    104		if (ret < 0) {
    105			dev_err(&pdev->dev,
    106				"failed to get valid sensor resource id: %d\n",
    107				ret);
    108			of_node_put(child);
    109			break;
    110		}
    111
    112		sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
    113								   sensor->resource_id,
    114								   sensor,
    115								   &imx_sc_thermal_ops);
    116		if (IS_ERR(sensor->tzd)) {
    117			dev_err(&pdev->dev, "failed to register thermal zone\n");
    118			ret = PTR_ERR(sensor->tzd);
    119			of_node_put(child);
    120			break;
    121		}
    122
    123		if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
    124			dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
    125	}
    126
    127put_node:
    128	of_node_put(sensor_np);
    129	of_node_put(np);
    130
    131	return ret;
    132}
    133
    134static int imx_sc_thermal_remove(struct platform_device *pdev)
    135{
    136	return 0;
    137}
    138
    139static const struct of_device_id imx_sc_thermal_table[] = {
    140	{ .compatible = "fsl,imx-sc-thermal", },
    141	{}
    142};
    143MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
    144
    145static struct platform_driver imx_sc_thermal_driver = {
    146		.probe = imx_sc_thermal_probe,
    147		.remove	= imx_sc_thermal_remove,
    148		.driver = {
    149			.name = "imx-sc-thermal",
    150			.of_match_table = imx_sc_thermal_table,
    151		},
    152};
    153module_platform_driver(imx_sc_thermal_driver);
    154
    155MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
    156MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
    157MODULE_LICENSE("GPL v2");