/* * 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"); 4'>81f8654dcf1879e40f2670b1b29c9d7ae812c9ac /drivers parent8fe809a992639b2013c0d8da2ba55cdea28a959a (diff)
sfc: get rid of custom busy polling code
In linux-4.5, busy polling was implemented in core NAPI stack, meaning that all custom implementation can be removed from drivers. Not only we remove lot's of tricky code, we also remove one lock operation in fast path. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Edward Cree <ecree@solarflare.com> Cc: Bert Kenward <bkenward@solarflare.com> Acked-by: Bert Kenward <bkenward@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')