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/acpi.h> 19 #include <linux/module.h> 20 #include <linux/interrupt.h> 21 #include <asm/cpu_device_id.h> 22 #include <asm/intel-family.h> 23 #include "intel_soc_dts_iosf.h" 24 25 #define CRITICAL_OFFSET_FROM_TJ_MAX 5000 26 27 static int crit_offset = CRITICAL_OFFSET_FROM_TJ_MAX; 28 module_param(crit_offset, int, 0644); 29 MODULE_PARM_DESC(crit_offset, 30 "Critical Temperature offset from tj max in millidegree Celsius."); 31 32 /* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */ 33 #define BYT_SOC_DTS_APIC_IRQ 86 34 35 static int soc_dts_thres_gsi; 36 static int soc_dts_thres_irq; 37 static struct intel_soc_dts_sensors *soc_dts; 38 39 static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data) 40 { 41 pr_debug("proc_thermal_interrupt\n"); 42 intel_soc_dts_iosf_interrupt_handler(soc_dts); 43 44 return IRQ_HANDLED; 45 } 46 47 static const struct x86_cpu_id soc_thermal_ids[] = { 48 { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT, 0, 49 BYT_SOC_DTS_APIC_IRQ}, 50 {} 51 }; 52 MODULE_DEVICE_TABLE(x86cpu, soc_thermal_ids); 53 54 static int __init intel_soc_thermal_init(void) 55 { 56 int err = 0; 57 const struct x86_cpu_id *match_cpu; 58 59 match_cpu = x86_match_cpu(soc_thermal_ids); 60 if (!match_cpu) 61 return -ENODEV; 62 63 /* Create a zone with 2 trips with marked as read only */ 64 soc_dts = intel_soc_dts_iosf_init(INTEL_SOC_DTS_INTERRUPT_APIC, 2, 1); 65 if (IS_ERR(soc_dts)) { 66 err = PTR_ERR(soc_dts); 67 return err; 68 } 69 70 soc_dts_thres_gsi = (int)match_cpu->driver_data; 71 if (soc_dts_thres_gsi) { 72 /* 73 * Note the flags here MUST match the firmware defaults, rather 74 * then the request_irq flags, otherwise we get an EBUSY error. 75 */ 76 soc_dts_thres_irq = acpi_register_gsi(NULL, soc_dts_thres_gsi, 77 ACPI_LEVEL_SENSITIVE, 78 ACPI_ACTIVE_LOW); 79 if (soc_dts_thres_irq < 0) { 80 pr_warn("intel_soc_dts: Could not get IRQ for GSI %d, err %d\n", 81 soc_dts_thres_gsi, soc_dts_thres_irq); 82 soc_dts_thres_irq = 0; 83 } 84 } 85 86 if (soc_dts_thres_irq) { 87 err = request_threaded_irq(soc_dts_thres_irq, NULL, 88 soc_irq_thread_fn, 89 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 90 "soc_dts", soc_dts); 91 if (err) { 92 /* 93 * Do not just error out because the user space thermal 94 * daemon such as DPTF may use polling instead of being 95 * interrupt driven. 96 */ 97 pr_warn("request_threaded_irq ret %d\n", err); 98 } 99 } 100 101 err = intel_soc_dts_iosf_add_read_only_critical_trip(soc_dts, 102 crit_offset); 103 if (err) 104 goto error_trips; 105 106 return 0; 107 108 error_trips: 109 if (soc_dts_thres_irq) { 110 free_irq(soc_dts_thres_irq, soc_dts); 111 acpi_unregister_gsi(soc_dts_thres_gsi); 112 } 113 intel_soc_dts_iosf_exit(soc_dts); 114 115 return err; 116 } 117 118 static void __exit intel_soc_thermal_exit(void) 119 { 120 if (soc_dts_thres_irq) { 121 free_irq(soc_dts_thres_irq, soc_dts); 122 acpi_unregister_gsi(soc_dts_thres_gsi); 123 } 124 intel_soc_dts_iosf_exit(soc_dts); 125 } 126 127 module_init(intel_soc_thermal_init) 128 module_exit(intel_soc_thermal_exit) 129 130 MODULE_DESCRIPTION("Intel SoC DTS Thermal Driver"); 131 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 132 MODULE_LICENSE("GPL v2"); 133