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");