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Commit 4d5d2ccd authored by Manaf Meethalavalappu Pallikunhi's avatar Manaf Meethalavalappu Pallikunhi
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drivers: thermal: Add support for RPM SMD cooling device 



Add a snapshot of RPM SMD cooling device driver from msm-4.14 as of
'commit <f7835e76aab01> ("drivers: thermal: Add support for RPM SMD
cooling device")'.

Change-Id: If89533ec0717935a6263e0e1c7f883cd57869127
Signed-off-by: default avatarManaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>
parent e58e95ba

drivers/thermal/qcom/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -127,3 +127,12 @@ config REGULATOR_COOLING_DEVICE 
	  on a particular regulator. This mitigation device will be used by low

	  temperature reliability rules to mitigate a regulator at nominal

	  voltage.



config QTI_RPM_SMD_COOLING_DEVICE

	tristate "Qualcomm Technologies Inc. RPM SMD cooling device driver"

	depends on MSM_RPM_SMD && THERMAL_OF

	help

	  This implements a mitigation device to send temperature band

	  level to RPM hardware via SMD protocol. This mitigation device

	  will be used by temperature reliability rules to restrict a

	  railway at predefined voltage corner using RPM hardware.

drivers/thermal/qcom/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -20,3 +20,4 @@ obj-$(CONFIG_QTI_CPU_VOLTAGE_COOLING_DEVICE) += cpu_voltage_cooling.o 
obj-$(CONFIG_QTI_POLICY_ENGINE_SENSOR) += policy_engine.o

obj-${CONFIG_QTI_SDPM_CLOCK_MONITOR} += sdpm_clk.o

obj-$(CONFIG_REGULATOR_COOLING_DEVICE) += regulator_cdev.o

obj-$(CONFIG_QTI_RPM_SMD_COOLING_DEVICE) += rpm_smd_cooling_device.o

drivers/thermal/qcom/rpm_smd_cooling_device.c

0 → 100644
+200 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2018, 2020, The Linux Foundation. All rights reserved.

 */



#define pr_fmt(fmt) "%s:%s " fmt, KBUILD_MODNAME, __func__



#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/thermal.h>

#include <linux/err.h>

#include <soc/qcom/rpm-smd.h>



#define RPM_SMD_CDEV_DRIVER   "rpm-smd-cooling-device"

#define RPM_SMD_RES_TYPE       0x6d726874

#define RPM_SMD_RES_ID         0

#define RPM_SMD_KEY            1



enum rpm_smd_temp_band {

	RPM_SMD_COLD_CRITICAL = 1,

	RPM_SMD_COLD,

	RPM_SMD_COOL,

	RPM_SMD_NORMAL,

	RPM_SMD_WARM,

	RPM_SMD_HOT,

	RPM_SMD_HOT_CRITICAL,

	RPM_SMD_TEMP_MAX_NR,

};



struct rpm_smd_cdev {

	struct thermal_cooling_device	*cool_dev;

	char				dev_name[THERMAL_NAME_LENGTH];

	unsigned int			state;

	struct msm_rpm_request		*rpm_handle;

};



static int rpm_smd_send_request_to_rpm(struct rpm_smd_cdev *rpm_smd_dev,

			unsigned int state)

{

	unsigned int band;

	int msg_id, ret;



	if (!rpm_smd_dev || !rpm_smd_dev->rpm_handle) {

		pr_err("Invalid RPM SMD handle\n");

		return -EINVAL;

	}



	if (rpm_smd_dev->state == state)

		return 0;



	/* if state is zero, then send RPM_SMD_NORMAL band */

	if (!state)

		band = RPM_SMD_NORMAL;

	else

		band = state;



	ret = msm_rpm_add_kvp_data(rpm_smd_dev->rpm_handle, RPM_SMD_KEY,

		(const uint8_t *)&band, (int)sizeof(band));

	if (ret) {

		pr_err("Adding KVP data failed. err:%d\n", ret);

		return ret;

	}



	msg_id = msm_rpm_send_request(rpm_smd_dev->rpm_handle);

	if (!msg_id) {

		pr_err("RPM SMD send request failed\n");

		return -ENXIO;

	}



	ret = msm_rpm_wait_for_ack(msg_id);

	if (ret) {

		pr_err("RPM SMD wait for ACK failed. err:%d\n", ret);

		return ret;

	}

	rpm_smd_dev->state = state;



	pr_debug("Requested RPM SMD band:%d for %s\n", band,

		rpm_smd_dev->dev_name);



	return ret;

}



static int rpm_smd_get_max_state(struct thermal_cooling_device *cdev,

				 unsigned long *state)

{

	*state = RPM_SMD_TEMP_MAX_NR - 1;



	return 0;

}



static int rpm_smd_set_cur_state(struct thermal_cooling_device *cdev,

				 unsigned long state)

{

	struct rpm_smd_cdev *rpm_smd_dev = cdev->devdata;

	int ret = 0;



	if (state > (RPM_SMD_TEMP_MAX_NR - 1))

		state = RPM_SMD_TEMP_MAX_NR - 1;



	ret = rpm_smd_send_request_to_rpm(rpm_smd_dev, (unsigned int)state);

	if (ret)

		return ret;



	return ret;

}



static int rpm_smd_get_cur_state(struct thermal_cooling_device *cdev,

				 unsigned long *state)

{

	struct rpm_smd_cdev *rpm_smd_dev = cdev->devdata;



	*state = rpm_smd_dev->state;



	return 0;

}



static struct thermal_cooling_device_ops rpm_smd_device_ops = {

	.get_max_state = rpm_smd_get_max_state,

	.get_cur_state = rpm_smd_get_cur_state,

	.set_cur_state = rpm_smd_set_cur_state,

};



static int rpm_smd_cdev_remove(struct platform_device *pdev)

{

	struct rpm_smd_cdev *rpm_smd_dev =

		(struct rpm_smd_cdev *)dev_get_drvdata(&pdev->dev);



	if (rpm_smd_dev) {

		if (rpm_smd_dev->cool_dev)

			thermal_cooling_device_unregister(

					rpm_smd_dev->cool_dev);



		rpm_smd_send_request_to_rpm(rpm_smd_dev, RPM_SMD_NORMAL);

		msm_rpm_free_request(rpm_smd_dev->rpm_handle);

	}



	return 0;

}



static int rpm_smd_cdev_probe(struct platform_device *pdev)

{

	struct rpm_smd_cdev *rpm_smd_dev;

	int ret = 0;

	struct device_node *np;



	np = dev_of_node(&pdev->dev);

	if (!np) {

		dev_err(&pdev->dev,

			"of node not available for rpm smd cooling device\n");

		return -EINVAL;

	}



	rpm_smd_dev = devm_kzalloc(&pdev->dev, sizeof(*rpm_smd_dev),

					GFP_KERNEL);

	if (!rpm_smd_dev)

		return -ENOMEM;



	rpm_smd_dev->rpm_handle = msm_rpm_create_request(MSM_RPM_CTX_ACTIVE_SET,

			RPM_SMD_RES_TYPE, RPM_SMD_RES_ID, 1);

	if (!rpm_smd_dev->rpm_handle) {

		dev_err(&pdev->dev, "Creating RPM SMD request handle failed\n");

		return -ENXIO;

	}



	strlcpy(rpm_smd_dev->dev_name, np->name, THERMAL_NAME_LENGTH);



	/* Be pro-active and mitigate till we get first vote from TF */

	rpm_smd_send_request_to_rpm(rpm_smd_dev, RPM_SMD_COLD);



	rpm_smd_dev->cool_dev = thermal_of_cooling_device_register(

					np, rpm_smd_dev->dev_name, rpm_smd_dev,

					&rpm_smd_device_ops);

	if (IS_ERR(rpm_smd_dev->cool_dev)) {

		ret = PTR_ERR(rpm_smd_dev->cool_dev);

		dev_err(&pdev->dev, "rpm_smd cdev register err:%d\n", ret);

		rpm_smd_dev->cool_dev = NULL;

		return ret;

	}



	dev_set_drvdata(&pdev->dev, rpm_smd_dev);



	return ret;

}



static const struct of_device_id rpm_smd_cdev_of_match[] = {

	{.compatible = "qcom,rpm-smd-cooling-device", },

	{},

};



static struct platform_driver rpm_smd_cdev_driver = {

	.driver = {

		.name = RPM_SMD_CDEV_DRIVER,

		.of_match_table = rpm_smd_cdev_of_match,

	},

	.probe = rpm_smd_cdev_probe,

	.remove = rpm_smd_cdev_remove,

};



builtin_platform_driver(rpm_smd_cdev_driver);

MODULE_LICENSE("GPL v2");