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Release 4.14 drivers/thermal/spear_thermal.c

Directory: drivers/thermal
/*
 * SPEAr thermal driver.
 *
 * Copyright (C) 2011-2012 ST Microelectronics
 * Author: Vincenzo Frascino <vincenzo.frascino@st.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 */

#include <linux/clk.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/thermal.h>


#define MD_FACTOR	1000

/* SPEAr Thermal Sensor Dev Structure */

struct spear_thermal_dev {
	/* pointer to base address of the thermal sensor */
	
void __iomem *thermal_base;
	/* clk structure */
	
struct clk *clk;
	/* pointer to thermal flags */
	
unsigned int flags;
};


static inline int thermal_get_temp(struct thermal_zone_device *thermal, int *temp) { struct spear_thermal_dev *stdev = thermal->devdata; /* * Data are ready to be read after 628 usec from POWERDOWN signal * (PDN) = 1 */ *temp = (readl_relaxed(stdev->thermal_base) & 0x7F) * MD_FACTOR; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Vincenzo Frascino4395.56%133.33%
Viresh Kumar12.22%133.33%
Sascha Hauer12.22%133.33%
Total45100.00%3100.00%

static struct thermal_zone_device_ops ops = { .get_temp = thermal_get_temp, };
static int __maybe_unused spear_thermal_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev); struct spear_thermal_dev *stdev = spear_thermal->devdata; unsigned int actual_mask = 0; /* Disable SPEAr Thermal Sensor */ actual_mask = readl_relaxed(stdev->thermal_base); writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base); clk_disable(stdev->clk); dev_info(dev, "Suspended.\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Vincenzo Frascino8596.59%133.33%
Viresh Kumar22.27%133.33%
Arnd Bergmann11.14%133.33%
Total88100.00%3100.00%


static int __maybe_unused spear_thermal_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev); struct spear_thermal_dev *stdev = spear_thermal->devdata; unsigned int actual_mask = 0; int ret = 0; ret = clk_enable(stdev->clk); if (ret) { dev_err(&pdev->dev, "Can't enable clock\n"); return ret; } /* Enable SPEAr Thermal Sensor */ actual_mask = readl_relaxed(stdev->thermal_base); writel_relaxed(actual_mask | stdev->flags, stdev->thermal_base); dev_info(dev, "Resumed.\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Vincenzo Frascino11097.35%133.33%
Viresh Kumar21.77%133.33%
Arnd Bergmann10.88%133.33%
Total113100.00%3100.00%

static SIMPLE_DEV_PM_OPS(spear_thermal_pm_ops, spear_thermal_suspend, spear_thermal_resume);
static int spear_thermal_probe(struct platform_device *pdev) { struct thermal_zone_device *spear_thermal = NULL; struct spear_thermal_dev *stdev; struct device_node *np = pdev->dev.of_node; struct resource *res; int ret = 0, val; if (!np || !of_property_read_u32(np, "st,thermal-flags", &val)) { dev_err(&pdev->dev, "Failed: DT Pdata not passed\n"); return -EINVAL; } stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL); if (!stdev) return -ENOMEM; /* Enable thermal sensor */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); stdev->thermal_base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(stdev->thermal_base)) return PTR_ERR(stdev->thermal_base); stdev->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(stdev->clk)) { dev_err(&pdev->dev, "Can't get clock\n"); return PTR_ERR(stdev->clk); } ret = clk_enable(stdev->clk); if (ret) { dev_err(&pdev->dev, "Can't enable clock\n"); return ret; } stdev->flags = val; writel_relaxed(stdev->flags, stdev->thermal_base); spear_thermal = thermal_zone_device_register("spear_thermal", 0, 0, stdev, &ops, NULL, 0, 0); if (IS_ERR(spear_thermal)) { dev_err(&pdev->dev, "thermal zone device is NULL\n"); ret = PTR_ERR(spear_thermal); goto disable_clk; } platform_set_drvdata(pdev, spear_thermal); dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%p.\n", stdev->thermal_base); return 0; disable_clk: clk_disable(stdev->clk); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Vincenzo Frascino26582.04%112.50%
Viresh Kumar309.29%225.00%
Rui Zhang134.02%112.50%
Dan Carpenter72.17%112.50%
Durgadoss R41.24%225.00%
Julia Lawall41.24%112.50%
Total323100.00%8100.00%


static int spear_thermal_exit(struct platform_device *pdev) { unsigned int actual_mask = 0; struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev); struct spear_thermal_dev *stdev = spear_thermal->devdata; thermal_zone_device_unregister(spear_thermal); /* Disable SPEAr Thermal Sensor */ actual_mask = readl_relaxed(stdev->thermal_base); writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base); clk_disable(stdev->clk); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Vincenzo Frascino7397.33%150.00%
Viresh Kumar22.67%150.00%
Total75100.00%2100.00%

static const struct of_device_id spear_thermal_id_table[] = { { .compatible = "st,thermal-spear1340" }, {} }; MODULE_DEVICE_TABLE(of, spear_thermal_id_table); static struct platform_driver spear_thermal_driver = { .probe = spear_thermal_probe, .remove = spear_thermal_exit, .driver = { .name = "spear_thermal", .pm = &spear_thermal_pm_ops, .of_match_table = spear_thermal_id_table, }, }; module_platform_driver(spear_thermal_driver); MODULE_AUTHOR("Vincenzo Frascino <vincenzo.frascino@st.com>"); MODULE_DESCRIPTION("SPEAr thermal driver"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Vincenzo Frascino70387.44%110.00%
Viresh Kumar708.71%220.00%
Rui Zhang131.62%110.00%
Dan Carpenter70.87%110.00%
Durgadoss R40.50%220.00%
Julia Lawall40.50%110.00%
Arnd Bergmann20.25%110.00%
Sascha Hauer10.12%110.00%
Total804100.00%10100.00%
Directory: drivers/thermal
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