1 // SPDX-License-Identifier: GPL-2.0-only
3  * SPEAr thermal driver.
5  * Copyright (C) 2011-2012 ST Microelectronics
17 #include <linux/thermal.h>
21 /* SPEAr Thermal Sensor Dev Structure */
23 	/* pointer to base address of the thermal sensor */
27 	/* pointer to thermal flags */
31 static inline int thermal_get_temp(struct thermal_zone_device *thermal,  in thermal_get_temp()  argument
34 	struct spear_thermal_dev *stdev = thermal->devdata;  in thermal_get_temp()
40 	*temp = (readl_relaxed(stdev->thermal_base) & 0x7F) * MD_FACTOR;  in thermal_get_temp()
51 	struct spear_thermal_dev *stdev = spear_thermal->devdata;  in spear_thermal_suspend()
54 	/* Disable SPEAr Thermal Sensor */  in spear_thermal_suspend()
55 	actual_mask = readl_relaxed(stdev->thermal_base);  in spear_thermal_suspend()
56 	writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);  in spear_thermal_suspend()
58 	clk_disable(stdev->clk);  in spear_thermal_suspend()
67 	struct spear_thermal_dev *stdev = spear_thermal->devdata;  in spear_thermal_resume()
71 	ret = clk_enable(stdev->clk);  in spear_thermal_resume()
77 	/* Enable SPEAr Thermal Sensor */  in spear_thermal_resume()
78 	actual_mask = readl_relaxed(stdev->thermal_base);  in spear_thermal_resume()
79 	writel_relaxed(actual_mask | stdev->flags, stdev->thermal_base);  in spear_thermal_resume()
93 	struct device_node *np = pdev->dev.of_node;  in spear_thermal_probe()
97 	if (!np || !of_property_read_u32(np, "st,thermal-flags", &val)) {  in spear_thermal_probe()
98 		dev_err(&pdev->dev, "Failed: DT Pdata not passed\n");  in spear_thermal_probe()
99 		return -EINVAL;  in spear_thermal_probe()
102 	stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL);  in spear_thermal_probe()
104 		return -ENOMEM;  in spear_thermal_probe()
106 	/* Enable thermal sensor */  in spear_thermal_probe()
108 	stdev->thermal_base = devm_ioremap_resource(&pdev->dev, res);  in spear_thermal_probe()
109 	if (IS_ERR(stdev->thermal_base))  in spear_thermal_probe()
110 		return PTR_ERR(stdev->thermal_base);  in spear_thermal_probe()
112 	stdev->clk = devm_clk_get(&pdev->dev, NULL);  in spear_thermal_probe()
113 	if (IS_ERR(stdev->clk)) {  in spear_thermal_probe()
114 		dev_err(&pdev->dev, "Can't get clock\n");  in spear_thermal_probe()
115 		return PTR_ERR(stdev->clk);  in spear_thermal_probe()
118 	ret = clk_enable(stdev->clk);  in spear_thermal_probe()
120 		dev_err(&pdev->dev, "Can't enable clock\n");  in spear_thermal_probe()
124 	stdev->flags = val;  in spear_thermal_probe()
125 	writel_relaxed(stdev->flags, stdev->thermal_base);  in spear_thermal_probe()
130 		dev_err(&pdev->dev, "thermal zone device is NULL\n");  in spear_thermal_probe()
136 		dev_err(&pdev->dev, "Cannot enable thermal zone\n");  in spear_thermal_probe()
142 	dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%p.\n",  in spear_thermal_probe()
143 			stdev->thermal_base);  in spear_thermal_probe()
150 	clk_disable(stdev->clk);  in spear_thermal_probe()
159 	struct spear_thermal_dev *stdev = spear_thermal->devdata;  in spear_thermal_exit()
163 	/* Disable SPEAr Thermal Sensor */  in spear_thermal_exit()
164 	actual_mask = readl_relaxed(stdev->thermal_base);  in spear_thermal_exit()
165 	writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);  in spear_thermal_exit()
167 	clk_disable(stdev->clk);  in spear_thermal_exit()
173 	{ .compatible = "st,thermal-spear1340" },
191 MODULE_DESCRIPTION("SPEAr thermal driver");