LXR linux/drivers/thermal/intel_soc_dts

   1/*
   2 * intel_soc_dts_thermal.c
   3 * Copyright (c) 2014, Intel Corporation.
   4 *
   5 * This program is free software; you can redistribute it and/or modify it
   6 * under the terms and conditions of the GNU General Public License,
   7 * version 2, as published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope it will be useful, but WITHOUT
  10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 * more details.
  13 *
  14 */
  15
  16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  17
  18#include <linux/module.h>
  19#include <linux/interrupt.h>
  20#include <asm/cpu_device_id.h>
  21#include "intel_soc_dts_iosf.h"
  22
  23#define CRITICAL_OFFSET_FROM_TJ_MAX     5000
  24
  25static int crit_offset = CRITICAL_OFFSET_FROM_TJ_MAX;
  26module_param(crit_offset, int, 0644);
  27MODULE_PARM_DESC(crit_offset,
  28        "Critical Temperature offset from tj max in millidegree Celsius.");
  29
  30/* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */
  31#define BYT_SOC_DTS_APIC_IRQ    86
  32
  33static int soc_dts_thres_irq;
  34static struct intel_soc_dts_sensors *soc_dts;
  35
  36static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data)
  37{
  38        pr_debug("proc_thermal_interrupt\n");
  39        intel_soc_dts_iosf_interrupt_handler(soc_dts);
  40
  41        return IRQ_HANDLED;
  42}
  43
  44static const struct x86_cpu_id soc_thermal_ids[] = {
  45        { X86_VENDOR_INTEL, X86_FAMILY_ANY, 0x37, 0, BYT_SOC_DTS_APIC_IRQ},
  46        {}
  47};
  48MODULE_DEVICE_TABLE(x86cpu, soc_thermal_ids);
  49
  50static int __init intel_soc_thermal_init(void)
  51{
  52        int err = 0;
  53        const struct x86_cpu_id *match_cpu;
  54
  55        match_cpu = x86_match_cpu(soc_thermal_ids);
  56        if (!match_cpu)
  57                return -ENODEV;
  58
  59        /* Create a zone with 2 trips with marked as read only */
  60        soc_dts = intel_soc_dts_iosf_init(INTEL_SOC_DTS_INTERRUPT_APIC, 2, 1);
  61        if (IS_ERR(soc_dts)) {
  62                err = PTR_ERR(soc_dts);
  63                return err;
  64        }
  65
  66        soc_dts_thres_irq = (int)match_cpu->driver_data;
  67
  68        if (soc_dts_thres_irq) {
  69                err = request_threaded_irq(soc_dts_thres_irq, NULL,
  70                                           soc_irq_thread_fn,
  71                                           IRQF_TRIGGER_RISING | IRQF_ONESHOT,
  72                                           "soc_dts", soc_dts);
  73                if (err) {
  74                        pr_err("request_threaded_irq ret %d\n", err);
  75                        goto error_irq;
  76                }
  77        }
  78
  79        err = intel_soc_dts_iosf_add_read_only_critical_trip(soc_dts,
  80                                                             crit_offset);
  81        if (err)
  82                goto error_trips;
  83
  84        return 0;
  85
  86error_trips:
  87        if (soc_dts_thres_irq)
  88                free_irq(soc_dts_thres_irq, soc_dts);
  89error_irq:
  90        intel_soc_dts_iosf_exit(soc_dts);
  91
  92        return err;
  93}
  94
  95static void __exit intel_soc_thermal_exit(void)
  96{
  97        if (soc_dts_thres_irq)
  98                free_irq(soc_dts_thres_irq, soc_dts);
  99        intel_soc_dts_iosf_exit(soc_dts);
 100}
 101
 102module_init(intel_soc_thermal_init)
 103module_exit(intel_soc_thermal_exit)
 104
 105MODULE_DESCRIPTION("Intel SoC DTS Thermal Driver");
 106MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 107MODULE_LICENSE("GPL v2");
 108