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192 lines
4.8 KiB
192 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* SPEAr thermal driver. |
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* |
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* Copyright (C) 2011-2012 ST Microelectronics |
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* Author: Vincenzo Frascino <[email protected]> |
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*/ |
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#include <linux/clk.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/of.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/thermal.h> |
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#define MD_FACTOR 1000 |
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/* SPEAr Thermal Sensor Dev Structure */ |
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struct spear_thermal_dev { |
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/* pointer to base address of the thermal sensor */ |
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void __iomem *thermal_base; |
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/* clk structure */ |
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struct clk *clk; |
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/* pointer to thermal flags */ |
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unsigned int flags; |
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}; |
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static inline int thermal_get_temp(struct thermal_zone_device *thermal, |
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int *temp) |
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{ |
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struct spear_thermal_dev *stdev = thermal->devdata; |
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/* |
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* Data are ready to be read after 628 usec from POWERDOWN signal |
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* (PDN) = 1 |
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*/ |
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*temp = (readl_relaxed(stdev->thermal_base) & 0x7F) * MD_FACTOR; |
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return 0; |
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} |
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static struct thermal_zone_device_ops ops = { |
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.get_temp = thermal_get_temp, |
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}; |
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static int __maybe_unused spear_thermal_suspend(struct device *dev) |
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{ |
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struct thermal_zone_device *spear_thermal = dev_get_drvdata(dev); |
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struct spear_thermal_dev *stdev = spear_thermal->devdata; |
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unsigned int actual_mask = 0; |
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/* Disable SPEAr Thermal Sensor */ |
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actual_mask = readl_relaxed(stdev->thermal_base); |
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writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base); |
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clk_disable(stdev->clk); |
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dev_info(dev, "Suspended.\n"); |
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return 0; |
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} |
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static int __maybe_unused spear_thermal_resume(struct device *dev) |
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{ |
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struct thermal_zone_device *spear_thermal = dev_get_drvdata(dev); |
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struct spear_thermal_dev *stdev = spear_thermal->devdata; |
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unsigned int actual_mask = 0; |
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int ret = 0; |
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ret = clk_enable(stdev->clk); |
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if (ret) { |
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dev_err(dev, "Can't enable clock\n"); |
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return ret; |
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} |
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/* Enable SPEAr Thermal Sensor */ |
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actual_mask = readl_relaxed(stdev->thermal_base); |
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writel_relaxed(actual_mask | stdev->flags, stdev->thermal_base); |
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dev_info(dev, "Resumed.\n"); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(spear_thermal_pm_ops, spear_thermal_suspend, |
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spear_thermal_resume); |
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static int spear_thermal_probe(struct platform_device *pdev) |
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{ |
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struct thermal_zone_device *spear_thermal = NULL; |
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struct spear_thermal_dev *stdev; |
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struct device_node *np = pdev->dev.of_node; |
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struct resource *res; |
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int ret = 0, val; |
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if (!np || !of_property_read_u32(np, "st,thermal-flags", &val)) { |
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dev_err(&pdev->dev, "Failed: DT Pdata not passed\n"); |
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return -EINVAL; |
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} |
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stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL); |
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if (!stdev) |
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return -ENOMEM; |
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/* Enable thermal sensor */ |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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stdev->thermal_base = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(stdev->thermal_base)) |
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return PTR_ERR(stdev->thermal_base); |
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stdev->clk = devm_clk_get(&pdev->dev, NULL); |
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if (IS_ERR(stdev->clk)) { |
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dev_err(&pdev->dev, "Can't get clock\n"); |
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return PTR_ERR(stdev->clk); |
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} |
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ret = clk_enable(stdev->clk); |
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if (ret) { |
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dev_err(&pdev->dev, "Can't enable clock\n"); |
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return ret; |
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} |
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stdev->flags = val; |
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writel_relaxed(stdev->flags, stdev->thermal_base); |
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spear_thermal = thermal_zone_device_register("spear_thermal", 0, 0, |
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stdev, &ops, NULL, 0, 0); |
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if (IS_ERR(spear_thermal)) { |
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dev_err(&pdev->dev, "thermal zone device is NULL\n"); |
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ret = PTR_ERR(spear_thermal); |
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goto disable_clk; |
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} |
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ret = thermal_zone_device_enable(spear_thermal); |
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if (ret) { |
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dev_err(&pdev->dev, "Cannot enable thermal zone\n"); |
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goto unregister_tzd; |
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} |
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platform_set_drvdata(pdev, spear_thermal); |
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dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%p.\n", |
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stdev->thermal_base); |
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return 0; |
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unregister_tzd: |
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thermal_zone_device_unregister(spear_thermal); |
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disable_clk: |
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clk_disable(stdev->clk); |
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return ret; |
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} |
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static int spear_thermal_exit(struct platform_device *pdev) |
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{ |
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unsigned int actual_mask = 0; |
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struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev); |
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struct spear_thermal_dev *stdev = spear_thermal->devdata; |
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thermal_zone_device_unregister(spear_thermal); |
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/* Disable SPEAr Thermal Sensor */ |
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actual_mask = readl_relaxed(stdev->thermal_base); |
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writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base); |
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clk_disable(stdev->clk); |
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return 0; |
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} |
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static const struct of_device_id spear_thermal_id_table[] = { |
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{ .compatible = "st,thermal-spear1340" }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, spear_thermal_id_table); |
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static struct platform_driver spear_thermal_driver = { |
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.probe = spear_thermal_probe, |
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.remove = spear_thermal_exit, |
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.driver = { |
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.name = "spear_thermal", |
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.pm = &spear_thermal_pm_ops, |
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.of_match_table = spear_thermal_id_table, |
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}, |
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}; |
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module_platform_driver(spear_thermal_driver); |
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MODULE_AUTHOR("Vincenzo Frascino <[email protected]>"); |
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MODULE_DESCRIPTION("SPEAr thermal driver"); |
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MODULE_LICENSE("GPL");
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