1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * intel_soc_dts_thermal.c 4 * Copyright (c) 2014, Intel Corporation. 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/acpi.h> 10 #include <linux/module.h> 11 #include <linux/interrupt.h> 12 #include <asm/cpu_device_id.h> 13 #include <asm/intel-family.h> 14 #include "intel_soc_dts_iosf.h" 15 16 #define CRITICAL_OFFSET_FROM_TJ_MAX 5000 17 18 static int crit_offset = CRITICAL_OFFSET_FROM_TJ_MAX; 19 module_param(crit_offset, int, 0644); 20 MODULE_PARM_DESC(crit_offset, 21 "Critical Temperature offset from tj max in millidegree Celsius."); 22 23 /* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */ 24 #define BYT_SOC_DTS_APIC_IRQ 86 25 26 static int soc_dts_thres_gsi; 27 static int soc_dts_thres_irq; 28 static struct intel_soc_dts_sensors *soc_dts; 29 30 static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data) 31 { 32 pr_debug("proc_thermal_interrupt\n"); 33 intel_soc_dts_iosf_interrupt_handler(soc_dts); 34 35 return IRQ_HANDLED; 36 } 37 38 static const struct x86_cpu_id soc_thermal_ids[] = { 39 X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT, BYT_SOC_DTS_APIC_IRQ), 40 {} 41 }; 42 MODULE_DEVICE_TABLE(x86cpu, soc_thermal_ids); 43 44 static int __init intel_soc_thermal_init(void) 45 { 46 int err = 0; 47 const struct x86_cpu_id *match_cpu; 48 49 match_cpu = x86_match_cpu(soc_thermal_ids); 50 if (!match_cpu) 51 return -ENODEV; 52 53 /* Create a zone with 2 trips with marked as read only */ 54 soc_dts = intel_soc_dts_iosf_init(INTEL_SOC_DTS_INTERRUPT_APIC, 2, 1); 55 if (IS_ERR(soc_dts)) { 56 err = PTR_ERR(soc_dts); 57 return err; 58 } 59 60 soc_dts_thres_gsi = (int)match_cpu->driver_data; 61 if (soc_dts_thres_gsi) { 62 /* 63 * Note the flags here MUST match the firmware defaults, rather 64 * then the request_irq flags, otherwise we get an EBUSY error. 65 */ 66 soc_dts_thres_irq = acpi_register_gsi(NULL, soc_dts_thres_gsi, 67 ACPI_LEVEL_SENSITIVE, 68 ACPI_ACTIVE_LOW); 69 if (soc_dts_thres_irq < 0) { 70 pr_warn("intel_soc_dts: Could not get IRQ for GSI %d, err %d\n", 71 soc_dts_thres_gsi, soc_dts_thres_irq); 72 soc_dts_thres_irq = 0; 73 } 74 } 75 76 if (soc_dts_thres_irq) { 77 err = request_threaded_irq(soc_dts_thres_irq, NULL, 78 soc_irq_thread_fn, 79 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 80 "soc_dts", soc_dts); 81 if (err) { 82 /* 83 * Do not just error out because the user space thermal 84 * daemon such as DPTF may use polling instead of being 85 * interrupt driven. 86 */ 87 pr_warn("request_threaded_irq ret %d\n", err); 88 } 89 } 90 91 err = intel_soc_dts_iosf_add_read_only_critical_trip(soc_dts, 92 crit_offset); 93 if (err) 94 goto error_trips; 95 96 return 0; 97 98 error_trips: 99 if (soc_dts_thres_irq) { 100 free_irq(soc_dts_thres_irq, soc_dts); 101 acpi_unregister_gsi(soc_dts_thres_gsi); 102 } 103 intel_soc_dts_iosf_exit(soc_dts); 104 105 return err; 106 } 107 108 static void __exit intel_soc_thermal_exit(void) 109 { 110 if (soc_dts_thres_irq) { 111 free_irq(soc_dts_thres_irq, soc_dts); 112 acpi_unregister_gsi(soc_dts_thres_gsi); 113 } 114 intel_soc_dts_iosf_exit(soc_dts); 115 } 116 117 module_init(intel_soc_thermal_init) 118 module_exit(intel_soc_thermal_exit) 119 120 MODULE_DESCRIPTION("Intel SoC DTS Thermal Driver"); 121 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 122 MODULE_LICENSE("GPL v2"); 123