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![Andrzej Pietrasiewicz](/assets/img/avatar_default.png)
Some thermal zone devices never change their state, so they should be always enabled. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20200629122925.21729-9-andrzej.p@collabora.com
192 lines
4.8 KiB
C
192 lines
4.8 KiB
C
// 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 <vincenzo.frascino@st.com>
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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 <vincenzo.frascino@st.com>");
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MODULE_DESCRIPTION("SPEAr thermal driver");
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MODULE_LICENSE("GPL");
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