/* * R-Car THS/TSC thermal sensor driver * * Copyright (C) 2012 Renesas Solutions Corp. * Kuninori Morimoto * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * 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. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include #include #include #include #include #include #include #include #include #define IDLE_INTERVAL 5000 #define THSCR 0x2c #define THSSR 0x30 /* THSCR */ #define CPCTL (1 << 12) /* THSSR */ #define CTEMP 0x3f struct rcar_thermal_priv { void __iomem *base; struct device *dev; spinlock_t lock; }; #define MCELSIUS(temp) ((temp) * 1000) #define rcar_zone_to_priv(zone) ((zone)->devdata) #define rcar_priv_to_dev(priv) ((priv)->dev) /* * basic functions */ static u32 rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg) { unsigned long flags; u32 ret; spin_lock_irqsave(&priv->lock, flags); ret = ioread32(priv->base + reg); spin_unlock_irqrestore(&priv->lock, flags); return ret; } #if 0 /* no user at this point */ static void rcar_thermal_write(struct rcar_thermal_priv *priv, u32 reg, u32 data) { unsigned long flags; spin_lock_irqsave(&priv->lock, flags); iowrite32(data, priv->base + reg); spin_unlock_irqrestore(&priv->lock, flags); } #endif static void rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg, u32 mask, u32 data) { unsigned long flags; u32 val; spin_lock_irqsave(&priv->lock, flags); val = ioread32(priv->base + reg); val &= ~mask; val |= (data & mask); iowrite32(val, priv->base + reg); spin_unlock_irqrestore(&priv->lock, flags); } /* * zone device functions */ static int rcar_thermal_get_temp(struct thermal_zone_device *zone, unsigned long *temp) { struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); struct device *dev = rcar_priv_to_dev(priv); int i; int ctemp, old, new; /* * TSC decides a value of CPTAP automatically, * and this is the conditions which validate interrupt. */ rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL); ctemp = 0; old = ~0; for (i = 0; i < 128; i++) { /* * we need to wait 300us after changing comparator offset * to get stable temperature. * see "Usage Notes" on datasheet */ udelay(300); new = rcar_thermal_read(priv, THSSR) & CTEMP; if (new == old) { ctemp = new; break; } old = new; } if (!ctemp) { dev_err(dev, "thermal sensor was broken\n"); return -EINVAL; } *temp = MCELSIUS((ctemp * 5) - 65); return 0; } static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone, int trip, enum thermal_trip_type *type) { struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); /* see rcar_thermal_get_temp() */ switch (trip) { case 0: /* +90 <= temp */ *type = THERMAL_TRIP_CRITICAL; break; default: dev_err(priv->dev, "rcar driver trip error\n"); return -EINVAL; } return 0; } static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone, int trip, unsigned long *temp) { struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); /* see rcar_thermal_get_temp() */ switch (trip) { case 0: /* +90 <= temp */ *temp = MCELSIUS(90); break; default: dev_err(priv->dev, "rcar driver trip error\n"); return -EINVAL; } return 0; } static int rcar_thermal_notify(struct thermal_zone_device *zone, int trip, enum thermal_trip_type type) { struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); switch (type) { case THERMAL_TRIP_CRITICAL: /* FIXME */ dev_warn(priv->dev, "Thermal reached to critical temperature\n"); machine_power_off(); break; default: break; } return 0; } static struct thermal_zone_device_ops rcar_thermal_zone_ops = { .get_temp = rcar_thermal_get_temp, .get_trip_type = rcar_thermal_get_trip_type, .get_trip_temp = rcar_thermal_get_trip_temp, .notify = rcar_thermal_notify, }; /* * platform functions */ static int rcar_thermal_probe(struct platform_device *pdev) { struct thermal_zone_device *zone; struct rcar_thermal_priv *priv; struct resource *res; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&pdev->dev, "Could not get platform resource\n"); return -ENODEV; } priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) { dev_err(&pdev->dev, "Could not allocate priv\n"); return -ENOMEM; } priv->dev = &pdev->dev; spin_lock_init(&priv->lock); priv->base = devm_ioremap_nocache(&pdev->dev, res->start, resource_size(res)); if (!priv->base) { dev_err(&pdev->dev, "Unable to ioremap thermal register\n"); return -ENOMEM; } zone = thermal_zone_device_register("rcar_thermal", 1, 0, priv, &rcar_thermal_zone_ops, NULL, 0, IDLE_INTERVAL); if (IS_ERR(zone)) { dev_err(&pdev->dev, "thermal zone device is NULL\n"); return PTR_ERR(zone); } platform_set_drvdata(pdev, zone); dev_info(&pdev->dev, "proved\n"); return 0; } static int rcar_thermal_remove(struct platform_device *pdev) { struct thermal_zone_device *zone = platform_get_drvdata(pdev); thermal_zone_device_unregister(zone); platform_set_drvdata(pdev, NULL); return 0; } static struct platform_driver rcar_thermal_driver = { .driver = { .name = "rcar_thermal", }, .probe = rcar_thermal_probe, .remove = rcar_thermal_remove, }; module_platform_driver(rcar_thermal_driver); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver"); MODULE_AUTHOR("Kuninori Morimoto ");