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 <asm/intel-family.h>
  22#include "intel_soc_dts_iosf.h"
  23
  24#define CRITICAL_OFFSET_FROM_TJ_MAX     5000
  25
  26static int crit_offset = CRITICAL_OFFSET_FROM_TJ_MAX;
  27module_param(crit_offset, int, 0644);
  28MODULE_PARM_DESC(crit_offset,
  29        "Critical Temperature offset from tj max in millidegree Celsius.");
  30
  31/* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */
  32#define BYT_SOC_DTS_APIC_IRQ    86
  33
  34static int soc_dts_thres_irq;
  35static struct intel_soc_dts_sensors *soc_dts;
  36
  37static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data)
  38{
  39        pr_debug("proc_thermal_interrupt\n");
  40        intel_soc_dts_iosf_interrupt_handler(soc_dts);
  41
  42        return IRQ_HANDLED;
  43}
  44
  45static const struct x86_cpu_id soc_thermal_ids[] = {
  46        { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT1, 0,
  47                BYT_SOC_DTS_APIC_IRQ},
  48        {}
  49};
  50MODULE_DEVICE_TABLE(x86cpu, soc_thermal_ids);
  51
  52static int __init intel_soc_thermal_init(void)
  53{
  54        int err = 0;
  55        const struct x86_cpu_id *match_cpu;
  56
  57        match_cpu = x86_match_cpu(soc_thermal_ids);
  58        if (!match_cpu)
  59                return -ENODEV;
  60
  61        /* Create a zone with 2 trips with marked as read only */
  62        soc_dts = intel_soc_dts_iosf_init(INTEL_SOC_DTS_INTERRUPT_APIC, 2, 1);
  63        if (IS_ERR(soc_dts)) {
  64                err = PTR_ERR(soc_dts);
  65                return err;
  66        }
  67
  68        soc_dts_thres_irq = (int)match_cpu->driver_data;
  69
  70        if (soc_dts_thres_irq) {
  71                err = request_threaded_irq(soc_dts_thres_irq, NULL,
  72                                           soc_irq_thread_fn,
  73                                           IRQF_TRIGGER_RISING | IRQF_ONESHOT,
  74                                           "soc_dts", soc_dts);
  75                if (err) {
  76                        pr_err("request_threaded_irq ret %d\n", err);
  77                        goto error_irq;
  78                }
  79        }
  80
  81        err = intel_soc_dts_iosf_add_read_only_critical_trip(soc_dts,
  82                                                             crit_offset);
  83        if (err)
  84                goto error_trips;
  85
  86        return 0;
  87
  88error_trips:
  89        if (soc_dts_thres_irq)
  90                free_irq(soc_dts_thres_irq, soc_dts);
  91error_irq:
  92        intel_soc_dts_iosf_exit(soc_dts);
  93
  94        return err;
  95}
  96
  97static void __exit intel_soc_thermal_exit(void)
  98{
  99        if (soc_dts_thres_irq)
 100                free_irq(soc_dts_thres_irq, soc_dts);
 101        intel_soc_dts_iosf_exit(soc_dts);
 102}
 103
 104module_init(intel_soc_thermal_init)
 105module_exit(intel_soc_thermal_exit)
 106
 107MODULE_DESCRIPTION("Intel SoC DTS Thermal Driver");
 108MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 109MODULE_LICENSE("GPL v2");
 110