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637 lines
14 KiB
637 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* R-Car THS/TSC thermal sensor driver |
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* |
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* Copyright (C) 2012 Renesas Solutions Corp. |
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* Kuninori Morimoto <[email protected]> |
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*/ |
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#include <linux/delay.h> |
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#include <linux/err.h> |
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#include <linux/irq.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/reboot.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/thermal.h> |
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|
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#include "thermal_hwmon.h" |
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|
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#define IDLE_INTERVAL 5000 |
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|
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#define COMMON_STR 0x00 |
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#define COMMON_ENR 0x04 |
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#define COMMON_INTMSK 0x0c |
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#define REG_POSNEG 0x20 |
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#define REG_FILONOFF 0x28 |
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#define REG_THSCR 0x2c |
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#define REG_THSSR 0x30 |
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#define REG_INTCTRL 0x34 |
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/* THSCR */ |
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#define CPCTL (1 << 12) |
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/* THSSR */ |
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#define CTEMP 0x3f |
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struct rcar_thermal_common { |
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void __iomem *base; |
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struct device *dev; |
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struct list_head head; |
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spinlock_t lock; |
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}; |
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struct rcar_thermal_chip { |
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unsigned int use_of_thermal : 1; |
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unsigned int has_filonoff : 1; |
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unsigned int irq_per_ch : 1; |
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unsigned int needs_suspend_resume : 1; |
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unsigned int nirqs; |
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unsigned int ctemp_bands; |
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}; |
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static const struct rcar_thermal_chip rcar_thermal = { |
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.use_of_thermal = 0, |
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.has_filonoff = 1, |
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.irq_per_ch = 0, |
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.needs_suspend_resume = 0, |
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.nirqs = 1, |
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.ctemp_bands = 1, |
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}; |
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static const struct rcar_thermal_chip rcar_gen2_thermal = { |
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.use_of_thermal = 1, |
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.has_filonoff = 1, |
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.irq_per_ch = 0, |
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.needs_suspend_resume = 0, |
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.nirqs = 1, |
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.ctemp_bands = 1, |
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}; |
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static const struct rcar_thermal_chip rcar_gen3_thermal = { |
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.use_of_thermal = 1, |
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.has_filonoff = 0, |
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.irq_per_ch = 1, |
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.needs_suspend_resume = 1, |
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/* |
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* The Gen3 chip has 3 interrupts, but this driver uses only 2 |
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* interrupts to detect a temperature change, rise or fall. |
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*/ |
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.nirqs = 2, |
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.ctemp_bands = 2, |
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}; |
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struct rcar_thermal_priv { |
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void __iomem *base; |
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struct rcar_thermal_common *common; |
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struct thermal_zone_device *zone; |
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const struct rcar_thermal_chip *chip; |
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struct delayed_work work; |
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struct mutex lock; |
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struct list_head list; |
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int id; |
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}; |
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#define rcar_thermal_for_each_priv(pos, common) \ |
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list_for_each_entry(pos, &common->head, list) |
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#define MCELSIUS(temp) ((temp) * 1000) |
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#define rcar_zone_to_priv(zone) ((zone)->devdata) |
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#define rcar_priv_to_dev(priv) ((priv)->common->dev) |
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#define rcar_has_irq_support(priv) ((priv)->common->base) |
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#define rcar_id_to_shift(priv) ((priv)->id * 8) |
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static const struct of_device_id rcar_thermal_dt_ids[] = { |
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{ |
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.compatible = "renesas,rcar-thermal", |
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.data = &rcar_thermal, |
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}, |
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{ |
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.compatible = "renesas,rcar-gen2-thermal", |
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.data = &rcar_gen2_thermal, |
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}, |
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{ |
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.compatible = "renesas,thermal-r8a774c0", |
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.data = &rcar_gen3_thermal, |
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}, |
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{ |
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.compatible = "renesas,thermal-r8a77970", |
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.data = &rcar_gen3_thermal, |
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}, |
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{ |
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.compatible = "renesas,thermal-r8a77990", |
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.data = &rcar_gen3_thermal, |
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}, |
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{ |
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.compatible = "renesas,thermal-r8a77995", |
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.data = &rcar_gen3_thermal, |
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}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids); |
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|
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/* |
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* basic functions |
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*/ |
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#define rcar_thermal_common_read(c, r) \ |
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_rcar_thermal_common_read(c, COMMON_ ##r) |
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static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common, |
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u32 reg) |
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{ |
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return ioread32(common->base + reg); |
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} |
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#define rcar_thermal_common_write(c, r, d) \ |
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_rcar_thermal_common_write(c, COMMON_ ##r, d) |
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static void _rcar_thermal_common_write(struct rcar_thermal_common *common, |
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u32 reg, u32 data) |
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{ |
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iowrite32(data, common->base + reg); |
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} |
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#define rcar_thermal_common_bset(c, r, m, d) \ |
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_rcar_thermal_common_bset(c, COMMON_ ##r, m, d) |
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static void _rcar_thermal_common_bset(struct rcar_thermal_common *common, |
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u32 reg, u32 mask, u32 data) |
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{ |
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u32 val; |
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val = ioread32(common->base + reg); |
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val &= ~mask; |
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val |= (data & mask); |
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iowrite32(val, common->base + reg); |
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} |
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#define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r) |
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static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg) |
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{ |
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return ioread32(priv->base + reg); |
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} |
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#define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d) |
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static void _rcar_thermal_write(struct rcar_thermal_priv *priv, |
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u32 reg, u32 data) |
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{ |
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iowrite32(data, priv->base + reg); |
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} |
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#define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d) |
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static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg, |
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u32 mask, u32 data) |
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{ |
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u32 val; |
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val = ioread32(priv->base + reg); |
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val &= ~mask; |
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val |= (data & mask); |
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iowrite32(val, priv->base + reg); |
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} |
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/* |
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* zone device functions |
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*/ |
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static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv) |
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{ |
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struct device *dev = rcar_priv_to_dev(priv); |
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int old, new, ctemp = -EINVAL; |
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unsigned int i; |
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mutex_lock(&priv->lock); |
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/* |
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* TSC decides a value of CPTAP automatically, |
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* and this is the conditions which validate interrupt. |
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*/ |
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rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL); |
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old = ~0; |
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for (i = 0; i < 128; i++) { |
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/* |
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* we need to wait 300us after changing comparator offset |
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* to get stable temperature. |
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* see "Usage Notes" on datasheet |
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*/ |
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usleep_range(300, 400); |
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new = rcar_thermal_read(priv, THSSR) & CTEMP; |
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if (new == old) { |
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ctemp = new; |
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break; |
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} |
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old = new; |
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} |
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if (ctemp < 0) { |
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dev_err(dev, "thermal sensor was broken\n"); |
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goto err_out_unlock; |
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} |
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/* |
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* enable IRQ |
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*/ |
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if (rcar_has_irq_support(priv)) { |
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if (priv->chip->has_filonoff) |
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rcar_thermal_write(priv, FILONOFF, 0); |
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/* enable Rising/Falling edge interrupt */ |
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rcar_thermal_write(priv, POSNEG, 0x1); |
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rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) | |
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((ctemp - 1) << 0))); |
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} |
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err_out_unlock: |
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mutex_unlock(&priv->lock); |
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return ctemp; |
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} |
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static int rcar_thermal_get_current_temp(struct rcar_thermal_priv *priv, |
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int *temp) |
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{ |
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int ctemp; |
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ctemp = rcar_thermal_update_temp(priv); |
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if (ctemp < 0) |
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return ctemp; |
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/* Guaranteed operating range is -45C to 125C. */ |
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if (priv->chip->ctemp_bands == 1) |
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*temp = MCELSIUS((ctemp * 5) - 65); |
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else if (ctemp < 24) |
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*temp = MCELSIUS(((ctemp * 55) - 720) / 10); |
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else |
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*temp = MCELSIUS((ctemp * 5) - 60); |
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return 0; |
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} |
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static int rcar_thermal_of_get_temp(void *data, int *temp) |
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{ |
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struct rcar_thermal_priv *priv = data; |
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return rcar_thermal_get_current_temp(priv, temp); |
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} |
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static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *temp) |
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{ |
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struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); |
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return rcar_thermal_get_current_temp(priv, temp); |
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} |
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static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone, |
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int trip, enum thermal_trip_type *type) |
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{ |
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struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); |
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struct device *dev = rcar_priv_to_dev(priv); |
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/* see rcar_thermal_get_temp() */ |
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switch (trip) { |
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case 0: /* +90 <= temp */ |
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*type = THERMAL_TRIP_CRITICAL; |
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break; |
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default: |
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dev_err(dev, "rcar driver trip error\n"); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone, |
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int trip, int *temp) |
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{ |
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struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); |
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struct device *dev = rcar_priv_to_dev(priv); |
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/* see rcar_thermal_get_temp() */ |
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switch (trip) { |
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case 0: /* +90 <= temp */ |
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*temp = MCELSIUS(90); |
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break; |
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default: |
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dev_err(dev, "rcar driver trip error\n"); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static const struct thermal_zone_of_device_ops rcar_thermal_zone_of_ops = { |
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.get_temp = rcar_thermal_of_get_temp, |
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}; |
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static struct thermal_zone_device_ops rcar_thermal_zone_ops = { |
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.get_temp = rcar_thermal_get_temp, |
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.get_trip_type = rcar_thermal_get_trip_type, |
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.get_trip_temp = rcar_thermal_get_trip_temp, |
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}; |
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/* |
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* interrupt |
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*/ |
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#define rcar_thermal_irq_enable(p) _rcar_thermal_irq_ctrl(p, 1) |
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#define rcar_thermal_irq_disable(p) _rcar_thermal_irq_ctrl(p, 0) |
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static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable) |
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{ |
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struct rcar_thermal_common *common = priv->common; |
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unsigned long flags; |
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u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */ |
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if (!rcar_has_irq_support(priv)) |
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return; |
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spin_lock_irqsave(&common->lock, flags); |
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rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask); |
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spin_unlock_irqrestore(&common->lock, flags); |
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} |
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static void rcar_thermal_work(struct work_struct *work) |
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{ |
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struct rcar_thermal_priv *priv; |
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int ret; |
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priv = container_of(work, struct rcar_thermal_priv, work.work); |
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ret = rcar_thermal_update_temp(priv); |
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if (ret < 0) |
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return; |
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rcar_thermal_irq_enable(priv); |
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thermal_zone_device_update(priv->zone, THERMAL_EVENT_UNSPECIFIED); |
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} |
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static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status) |
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{ |
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struct device *dev = rcar_priv_to_dev(priv); |
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status = (status >> rcar_id_to_shift(priv)) & 0x3; |
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if (status) { |
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dev_dbg(dev, "thermal%d %s%s\n", |
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priv->id, |
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(status & 0x2) ? "Rising " : "", |
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(status & 0x1) ? "Falling" : ""); |
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} |
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return status; |
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} |
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static irqreturn_t rcar_thermal_irq(int irq, void *data) |
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{ |
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struct rcar_thermal_common *common = data; |
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struct rcar_thermal_priv *priv; |
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u32 status, mask; |
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spin_lock(&common->lock); |
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mask = rcar_thermal_common_read(common, INTMSK); |
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status = rcar_thermal_common_read(common, STR); |
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rcar_thermal_common_write(common, STR, 0x000F0F0F & mask); |
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spin_unlock(&common->lock); |
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status = status & ~mask; |
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/* |
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* check the status |
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*/ |
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rcar_thermal_for_each_priv(priv, common) { |
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if (rcar_thermal_had_changed(priv, status)) { |
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rcar_thermal_irq_disable(priv); |
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queue_delayed_work(system_freezable_wq, &priv->work, |
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msecs_to_jiffies(300)); |
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} |
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} |
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return IRQ_HANDLED; |
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} |
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/* |
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* platform functions |
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*/ |
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static int rcar_thermal_remove(struct platform_device *pdev) |
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{ |
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struct rcar_thermal_common *common = platform_get_drvdata(pdev); |
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struct device *dev = &pdev->dev; |
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struct rcar_thermal_priv *priv; |
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rcar_thermal_for_each_priv(priv, common) { |
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rcar_thermal_irq_disable(priv); |
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cancel_delayed_work_sync(&priv->work); |
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if (priv->chip->use_of_thermal) |
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thermal_remove_hwmon_sysfs(priv->zone); |
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else |
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thermal_zone_device_unregister(priv->zone); |
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} |
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pm_runtime_put(dev); |
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pm_runtime_disable(dev); |
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return 0; |
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} |
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static int rcar_thermal_probe(struct platform_device *pdev) |
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{ |
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struct rcar_thermal_common *common; |
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struct rcar_thermal_priv *priv; |
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struct device *dev = &pdev->dev; |
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struct resource *res, *irq; |
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const struct rcar_thermal_chip *chip = of_device_get_match_data(dev); |
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int mres = 0; |
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int i; |
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int ret = -ENODEV; |
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int idle = IDLE_INTERVAL; |
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u32 enr_bits = 0; |
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common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL); |
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if (!common) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, common); |
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INIT_LIST_HEAD(&common->head); |
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spin_lock_init(&common->lock); |
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common->dev = dev; |
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pm_runtime_enable(dev); |
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pm_runtime_get_sync(dev); |
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for (i = 0; i < chip->nirqs; i++) { |
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irq = platform_get_resource(pdev, IORESOURCE_IRQ, i); |
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if (!irq) |
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continue; |
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if (!common->base) { |
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/* |
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* platform has IRQ support. |
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* Then, driver uses common registers |
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* rcar_has_irq_support() will be enabled |
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*/ |
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res = platform_get_resource(pdev, IORESOURCE_MEM, |
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mres++); |
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common->base = devm_ioremap_resource(dev, res); |
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if (IS_ERR(common->base)) { |
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ret = PTR_ERR(common->base); |
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goto error_unregister; |
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} |
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idle = 0; /* polling delay is not needed */ |
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} |
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ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, |
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IRQF_SHARED, dev_name(dev), common); |
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if (ret) { |
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dev_err(dev, "irq request failed\n "); |
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goto error_unregister; |
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} |
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/* update ENR bits */ |
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if (chip->irq_per_ch) |
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enr_bits |= 1 << i; |
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} |
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for (i = 0;; i++) { |
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res = platform_get_resource(pdev, IORESOURCE_MEM, mres++); |
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if (!res) |
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break; |
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) { |
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ret = -ENOMEM; |
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goto error_unregister; |
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} |
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priv->base = devm_ioremap_resource(dev, res); |
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if (IS_ERR(priv->base)) { |
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ret = PTR_ERR(priv->base); |
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goto error_unregister; |
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} |
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priv->common = common; |
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priv->id = i; |
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priv->chip = chip; |
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mutex_init(&priv->lock); |
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INIT_LIST_HEAD(&priv->list); |
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INIT_DELAYED_WORK(&priv->work, rcar_thermal_work); |
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ret = rcar_thermal_update_temp(priv); |
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if (ret < 0) |
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goto error_unregister; |
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|
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if (chip->use_of_thermal) { |
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priv->zone = devm_thermal_zone_of_sensor_register( |
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dev, i, priv, |
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&rcar_thermal_zone_of_ops); |
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} else { |
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priv->zone = thermal_zone_device_register( |
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"rcar_thermal", |
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1, 0, priv, |
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&rcar_thermal_zone_ops, NULL, 0, |
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idle); |
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ret = thermal_zone_device_enable(priv->zone); |
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if (ret) { |
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thermal_zone_device_unregister(priv->zone); |
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priv->zone = ERR_PTR(ret); |
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} |
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} |
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if (IS_ERR(priv->zone)) { |
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dev_err(dev, "can't register thermal zone\n"); |
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ret = PTR_ERR(priv->zone); |
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priv->zone = NULL; |
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goto error_unregister; |
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} |
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if (chip->use_of_thermal) { |
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/* |
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* thermal_zone doesn't enable hwmon as default, |
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* but, enable it here to keep compatible |
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*/ |
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priv->zone->tzp->no_hwmon = false; |
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ret = thermal_add_hwmon_sysfs(priv->zone); |
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if (ret) |
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goto error_unregister; |
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} |
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rcar_thermal_irq_enable(priv); |
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list_move_tail(&priv->list, &common->head); |
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|
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/* update ENR bits */ |
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if (!chip->irq_per_ch) |
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enr_bits |= 3 << (i * 8); |
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} |
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if (common->base && enr_bits) |
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rcar_thermal_common_write(common, ENR, enr_bits); |
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dev_info(dev, "%d sensor probed\n", i); |
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return 0; |
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error_unregister: |
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rcar_thermal_remove(pdev); |
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|
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return ret; |
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} |
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|
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#ifdef CONFIG_PM_SLEEP |
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static int rcar_thermal_suspend(struct device *dev) |
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{ |
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struct rcar_thermal_common *common = dev_get_drvdata(dev); |
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struct rcar_thermal_priv *priv = list_first_entry(&common->head, |
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typeof(*priv), list); |
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|
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if (priv->chip->needs_suspend_resume) { |
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rcar_thermal_common_write(common, ENR, 0); |
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rcar_thermal_irq_disable(priv); |
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rcar_thermal_bset(priv, THSCR, CPCTL, 0); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int rcar_thermal_resume(struct device *dev) |
|
{ |
|
struct rcar_thermal_common *common = dev_get_drvdata(dev); |
|
struct rcar_thermal_priv *priv = list_first_entry(&common->head, |
|
typeof(*priv), list); |
|
int ret; |
|
|
|
if (priv->chip->needs_suspend_resume) { |
|
ret = rcar_thermal_update_temp(priv); |
|
if (ret < 0) |
|
return ret; |
|
rcar_thermal_irq_enable(priv); |
|
rcar_thermal_common_write(common, ENR, 0x03); |
|
} |
|
|
|
return 0; |
|
} |
|
#endif |
|
|
|
static SIMPLE_DEV_PM_OPS(rcar_thermal_pm_ops, rcar_thermal_suspend, |
|
rcar_thermal_resume); |
|
|
|
static struct platform_driver rcar_thermal_driver = { |
|
.driver = { |
|
.name = "rcar_thermal", |
|
.pm = &rcar_thermal_pm_ops, |
|
.of_match_table = rcar_thermal_dt_ids, |
|
}, |
|
.probe = rcar_thermal_probe, |
|
.remove = rcar_thermal_remove, |
|
}; |
|
module_platform_driver(rcar_thermal_driver); |
|
|
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver"); |
|
MODULE_AUTHOR("Kuninori Morimoto <[email protected]>");
|
|
|