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Commit 682136f8 authored by Shiju Mathew's avatar Shiju Mathew
Browse files

msm: thermal: Add uio extension in KTM for memory mapping 



Since /dev/mem node no longer available for userspace
IO memory access, add UIO support in KTM for userspace
app to access IO memory mapped region. A UIO device
will be in the format /dev/uioX. Userspace uses mmap()
on these devices to access registers/memory.

Change-Id: I7a1a258cdf76a327b77e0995c8dad2ea0be63577
Signed-off-by: default avatarShiju Mathew <shijum@codeaurora.org>
parent 4313aedf

Documentation/devicetree/bindings/arm/msm/msm_thermal.txt

+2 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ Required properties 


Optional properties



- reg:                  Physical address for uio mapping

- qcom,core-limit-temp: Threshold temperature to start shutting down cores

			in degC

- qcom,core-temp-hysteresis: Degrees C below which the cores will be brought
@@ -225,6 +226,7 @@ Example: 


	qcom,msm-thermal {

		compatible = "qcom,msm-thermal";

		reg = <0x70000 0x1000>;

		qcom,sensor-id = <0>;

		qcom,poll-ms = <250>;

		qcom,limit-temp = <60>;

drivers/thermal/msm_thermal.c

+50 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ 
#include <linux/cpumask.h>

#include <linux/suspend.h>

#include <linux/uaccess.h>

#include <linux/uio_driver.h>



#define CREATE_TRACE_POINTS

#define TRACE_MSM_THERMAL
@@ -72,6 +73,7 @@ 
#define MSM_THERMAL_THRESH_UPDATE "update"

#define DEVM_NAME_MAX 30

#define HOTPLUG_RETRY_INTERVAL_MS 100

#define UIO_VERSION "1.0"



#define VALIDATE_AND_SET_MASK(_node, _key, _mask, _cpu) \

	do { \
@@ -441,6 +443,50 @@ static ssize_t thermal_config_debugfs_write(struct file *file, 
		_flag = 0; \

	} while (0)



static void uio_init(struct platform_device *pdev)

{

	int ret = 0;

	struct uio_info *uio_reg_info = NULL;

	struct resource *clnt_res = NULL;

	u32 mem_size = 0;

	phys_addr_t mem_pyhsical = 0;



	clnt_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!clnt_res) {

		pr_debug("resource not found\n");

		goto exit;

	}

	mem_size = resource_size(clnt_res);

	if (mem_size == 0) {

		pr_err("resource memory size is zero\n");

		goto exit;

	}



	uio_reg_info = devm_kzalloc(&pdev->dev, sizeof(struct uio_info),

			GFP_KERNEL);

	if (!uio_reg_info)

		goto exit;



	mem_pyhsical = clnt_res->start;



	/* Setup device */

	uio_reg_info->name = clnt_res->name;

	uio_reg_info->version = UIO_VERSION;

	uio_reg_info->mem[0].addr = mem_pyhsical;

	uio_reg_info->mem[0].size = mem_size;

	uio_reg_info->mem[0].memtype = UIO_MEM_PHYS;



	ret = uio_register_device(&pdev->dev, uio_reg_info);

	if (ret) {

		devm_kfree(&pdev->dev, uio_reg_info);

		pr_err("uio register failed ret=%d\n", ret);

		goto exit;

	}

	dev_set_drvdata(&pdev->dev, uio_reg_info);



exit:

	return;

}



static void get_cluster_mask(uint32_t cpu, cpumask_t *mask)

{
@@ -6865,7 +6911,9 @@ static int msm_thermal_dev_exit(struct platform_device *inp_dev) 
	int i = 0;

	uint32_t _cluster = 0;

	struct cluster_info *cluster_ptr = NULL;

	struct uio_info *info = dev_get_drvdata(&inp_dev->dev);



	uio_unregister_device(info);

	unregister_reboot_notifier(&msm_thermal_reboot_notifier);

	if (msm_therm_debugfs && msm_therm_debugfs->parent)

		debugfs_remove_recursive(msm_therm_debugfs->parent);
@@ -6975,6 +7023,8 @@ int __init msm_thermal_late_init(void) 
	create_cpu_topology_sysfs();

	create_thermal_debugfs();

	msm_thermal_add_bucket_info_nodes();

	uio_init(msm_thermal_info.pdev);



	return 0;

}

late_initcall(msm_thermal_late_init);