/* * 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_common { void __iomem *base; struct device *dev; struct list_head head; }; struct rcar_thermal_priv { void __iomem *base; struct rcar_thermal_common *common; struct thermal_zone_device *zone; struct mutex lock; struct list_head list; }; #define rcar_thermal_for_each_priv(pos, common) \ list_for_each_entry(pos, &common->head, list) #define MCELSIUS(temp) ((temp) * 1000) #define rcar_zone_to_priv(zone) ((zone)->devdata) #define rcar_priv_to_dev(priv) ((priv)->common->dev) #define rcar_has_irq_support(priv) ((priv)->common->base) /* * basic functions */ static u32 rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg) { return ioread32(priv->base + reg); } #if 0 /* no user at this point */ static void rcar_thermal_write(struct rcar_thermal_priv *priv, u32 reg, u32 data) { iowrite32(data, priv->base + reg); } #endif static void rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg, u32 mask, u32 data) { u32 val; val = ioread32(priv->base + reg); val &= ~mask; val |= (data & mask); iowrite32(val, priv->base + reg); } /* * 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; mutex_lock(&priv->lock); /* * 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); mutex_unlock(&priv->lock); 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); struct device *dev = rcar_priv_to_dev(priv); /* see rcar_thermal_get_temp() */ switch (trip) { case 0: /* +90 <= temp */ *type = THERMAL_TRIP_CRITICAL; break; default: dev_err(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); struct device *dev = rcar_priv_to_dev(priv); /* see rcar_thermal_get_temp() */ switch (trip) { case 0: /* +90 <= temp */ *temp = MCELSIUS(90); break; default: dev_err(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); struct device *dev = rcar_priv_to_dev(priv); switch (type) { case THERMAL_TRIP_CRITICAL: /* FIXME */ dev_warn(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 rcar_thermal_common *common; struct rcar_thermal_priv *priv; struct device *dev = &pdev->dev; struct resource *res, *irq; int mres = 0; int i; common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL); if (!common) { dev_err(dev, "Could not allocate common\n"); return -ENOMEM; } INIT_LIST_HEAD(&common->head); common->dev = dev; irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); if (irq) { /* * platform has IRQ support. * Then, drier use common register */ res = platform_get_resource(pdev, IORESOURCE_MEM, mres++); if (!res) { dev_err(dev, "Could not get platform resource\n"); return -ENODEV; } /* * rcar_has_irq_support() will be enabled */ common->base = devm_request_and_ioremap(dev, res); if (!common->base) { dev_err(dev, "Unable to ioremap thermal register\n"); return -ENOMEM; } } for (i = 0;; i++) { res = platform_get_resource(pdev, IORESOURCE_MEM, mres++); if (!res) break; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) { dev_err(dev, "Could not allocate priv\n"); return -ENOMEM; } priv->base = devm_request_and_ioremap(dev, res); if (!priv->base) { dev_err(dev, "Unable to ioremap priv register\n"); return -ENOMEM; } priv->common = common; mutex_init(&priv->lock); INIT_LIST_HEAD(&priv->list); priv->zone = thermal_zone_device_register("rcar_thermal", 1, 0, priv, &rcar_thermal_zone_ops, NULL, 0, IDLE_INTERVAL); if (IS_ERR(priv->zone)) { dev_err(dev, "can't register thermal zone\n"); goto error_unregister; } list_move_tail(&priv->list, &common->head); } platform_set_drvdata(pdev, common); dev_info(dev, "%d sensor proved\n", i); return 0; error_unregister: rcar_thermal_for_each_priv(priv, common) thermal_zone_device_unregister(priv->zone); return -ENODEV; } static int rcar_thermal_remove(struct platform_device *pdev) { struct rcar_thermal_common *common = platform_get_drvdata(pdev); struct rcar_thermal_priv *priv; rcar_thermal_for_each_priv(priv, common) thermal_zone_device_unregister(priv->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 ");