/* * SPEAr thermal driver. * * Copyright (C) 2011-2012 ST Microelectronics * Author: Vincenzo Frascino * * 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 #include #include #include #include #include #include #include #include #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; } 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; } 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; } 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; } 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; } 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 "); MODULE_DESCRIPTION("SPEAr thermal driver"); MODULE_LICENSE("GPL"); class='button' href='/cgit.cgi/linux/net-next.git/plain/include/xen/interface/features.h?id=b91e055c57e45131470d4935e4a726bd65b14580'>plain -rw-r--r--grant_table.h20945logplain d---------hvm72logplain d---------io429logplain -rw-r--r--memory.h8664logplain -rw-r--r--nmi.h1507logplain