drivers/thermal/imx_sc_thermal.c

/*
 * Copyright 2017 NXP
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <config.h>
#include <common.h>
#include <fuse.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/sys_proto.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h>
#include <thermal.h>
#include <dm/device-internal.h>
#include <dm/device.h>
#include <asm/arch/sci/sci.h>

DECLARE_GLOBAL_DATA_PTR;

struct imx_sc_thermal_plat {
	int critical;
	int alert;
	int polling_delay;
	int id;
	bool zone_node;
};

static int read_temperature(struct udevice *dev, int *temp)
{
	int sciErr;
	int16_t celsius;
	int8_t tenths;

	sc_rsrc_t *sensor_rsrc =
		(sc_rsrc_t *)dev_get_driver_data(dev);

	struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);

	if (!temp)
		return -EINVAL;

	sciErr = sc_misc_get_temp(-1, sensor_rsrc[pdata->id], SC_C_TEMP, &celsius, &tenths);
	if (sciErr) {
		printf("Error: get temperature failed! (error = %d)\n", sciErr);
		return -EIO;
	}

	*temp = celsius * 1000 + tenths * 100;

	return 0;
}

int imx_sc_thermal_get_temp(struct udevice *dev, int *temp)
{
	struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
	int cpu_tmp = 0;
	int ret;

	ret = read_temperature(dev, &cpu_tmp);
	if (ret)
		return ret;

	while (cpu_tmp >= pdata->alert) {
		printf("CPU Temperature (%dC) has beyond alert (%dC), close to critical (%dC)",
		       cpu_tmp, pdata->alert, pdata->critical);
		puts(" waiting...\n");
		mdelay(pdata->polling_delay);
		ret = read_temperature(dev, &cpu_tmp);
		if (ret)
			return ret;
	}

	*temp = cpu_tmp / 1000;

	return 0;
}

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

static int imx_sc_thermal_probe(struct udevice *dev)
{
	debug("%s dev name %s\n", __func__, dev->name);
	return 0;
}

static int imx_sc_thermal_bind(struct udevice *dev)
{
	int reg, ret;
	int offset;
	const char *name;
	const void *prop;

	struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);

	debug("%s dev name %s\n", __func__, dev->name);

	prop = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "compatible", NULL);
	if (!prop)
		return 0;
	else
		pdata->zone_node = 1;

	reg = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "tsens-num", 0);
	if (reg == 0) {
		printf("%s: no temp sensor number provided!\n", __func__);
		return -EINVAL;
	}

	offset = fdt_subnode_offset(gd->fdt_blob, 0, "thermal-zones");
	fdt_for_each_subnode(offset, gd->fdt_blob, offset) {
		/* Bind the subnode to this driver */
		name = fdt_get_name(gd->fdt_blob, offset, NULL);

		ret = device_bind_with_driver_data(dev, dev->driver, name,
						   dev->driver_data, offset_to_ofnode(offset), NULL);
		if (ret)
			printf("Error binding driver '%s': %d\n", dev->driver->name,
				ret);
	}
	return 0;
}

static int imx_sc_thermal_ofdata_to_platdata(struct udevice *dev)
{
	int ret;
	int trips_np;

	struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
	struct fdtdec_phandle_args args;

	debug("%s dev name %s\n", __func__, dev->name);

	if (pdata->zone_node)
		return 0;

	ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev), "thermal-sensors",
					 "#thermal-sensor-cells",
					 0, 0, &args);
	if (ret)
		return ret;

	if (args.node != dev_of_offset(dev->parent))
		return -EFAULT;

	if (args.args_count >= 1)
		pdata->id = args.args[0];
	else
		pdata->id = 0;

	debug("args.args_count %d, id %d\n", args.args_count, pdata->id);

	pdata->polling_delay = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "polling-delay", 1000);

	trips_np = fdt_subnode_offset(gd->fdt_blob, dev_of_offset(dev), "trips");
	fdt_for_each_subnode(trips_np, gd->fdt_blob, trips_np) {
		const char *type;
		type = fdt_getprop(gd->fdt_blob, trips_np, "type", NULL);
		if (type) {
			if (strcmp(type, "critical") == 0)
				pdata->critical = fdtdec_get_int(gd->fdt_blob, trips_np, "temperature", 85);
			else if (strcmp(type, "passive") == 0)
				pdata->alert = fdtdec_get_int(gd->fdt_blob, trips_np, "temperature", 80);
		}
	}

	debug("id %d polling_delay %d, critical %d, alert %d\n",
		pdata->id, pdata->polling_delay, pdata->critical, pdata->alert);

	return 0;
}

static const sc_rsrc_t imx8qm_sensor_rsrc[] = {
	SC_R_A53, SC_R_A72, SC_R_GPU_0_PID0, SC_R_GPU_1_PID0,
	SC_R_DRC_0, SC_R_DRC_1, SC_R_VPU_PID0, SC_R_PMIC_0,
	SC_R_PMIC_1, SC_R_PMIC_2,
};

static const sc_rsrc_t imx8qxp_sensor_rsrc[] = {
	SC_R_SYSTEM, SC_R_DRC_0, SC_R_PMIC_0,
	SC_R_PMIC_1, SC_R_PMIC_2,
};

static const struct udevice_id imx_sc_thermal_ids[] = {
	{ .compatible = "nxp,imx8qm-sc-tsens", .data = (ulong)&imx8qm_sensor_rsrc, },
	{ .compatible = "nxp,imx8qxp-sc-tsens", .data = (ulong)&imx8qxp_sensor_rsrc, },
	{ }
};

U_BOOT_DRIVER(imx_sc_thermal) = {
	.name	= "imx_sc_thermal",
	.id	= UCLASS_THERMAL,
	.ops	= &imx_sc_thermal_ops,
	.of_match = imx_sc_thermal_ids,
	.bind = imx_sc_thermal_bind,
	.probe	= imx_sc_thermal_probe,
	.ofdata_to_platdata = imx_sc_thermal_ofdata_to_platdata,
	.platdata_auto_alloc_size = sizeof(struct imx_sc_thermal_plat),
	.flags  = DM_FLAG_PRE_RELOC,
};