1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Windfarm PowerMac thermal control 4 * 5 * Copyright 2012 Benjamin Herrenschmidt, IBM Corp. 6 */ 7 8 #ifndef __WINDFARM_MPU_H 9 #define __WINDFARM_MPU_H 10 11 typedef unsigned short fu16; 12 typedef int fs32; 13 typedef short fs16; 14 15 /* Definition of the MPU data structure which contains per CPU 16 * calibration information (among others) for the G5 machines 17 */ 18 struct mpu_data 19 { 20 u8 signature; /* 0x00 - EEPROM sig. */ 21 u8 bytes_used; /* 0x01 - Bytes used in eeprom (160 ?) */ 22 u8 size; /* 0x02 - EEPROM size (256 ?) */ 23 u8 version; /* 0x03 - EEPROM version */ 24 u32 data_revision; /* 0x04 - Dataset revision */ 25 u8 processor_bin_code[3]; /* 0x08 - Processor BIN code */ 26 u8 bin_code_expansion; /* 0x0b - ??? (padding ?) */ 27 u8 processor_num; /* 0x0c - Number of CPUs on this MPU */ 28 u8 input_mul_bus_div; /* 0x0d - Clock input multiplier/bus divider */ 29 u8 reserved1[2]; /* 0x0e - */ 30 u32 input_clk_freq_high; /* 0x10 - Input clock frequency high */ 31 u8 cpu_nb_target_cycles; /* 0x14 - ??? */ 32 u8 cpu_statlat; /* 0x15 - ??? */ 33 u8 cpu_snooplat; /* 0x16 - ??? */ 34 u8 cpu_snoopacc; /* 0x17 - ??? */ 35 u8 nb_paamwin; /* 0x18 - ??? */ 36 u8 nb_statlat; /* 0x19 - ??? */ 37 u8 nb_snooplat; /* 0x1a - ??? */ 38 u8 nb_snoopwin; /* 0x1b - ??? */ 39 u8 api_bus_mode; /* 0x1c - ??? */ 40 u8 reserved2[3]; /* 0x1d - */ 41 u32 input_clk_freq_low; /* 0x20 - Input clock frequency low */ 42 u8 processor_card_slot; /* 0x24 - Processor card slot number */ 43 u8 reserved3[2]; /* 0x25 - */ 44 u8 padjmax; /* 0x27 - Max power adjustment (Not in OF!) */ 45 u8 ttarget; /* 0x28 - Target temperature */ 46 u8 tmax; /* 0x29 - Max temperature */ 47 u8 pmaxh; /* 0x2a - Max power */ 48 u8 tguardband; /* 0x2b - Guardband temp ??? Hist. len in OSX */ 49 fs32 pid_gp; /* 0x2c - PID proportional gain */ 50 fs32 pid_gr; /* 0x30 - PID reset gain */ 51 fs32 pid_gd; /* 0x34 - PID derivative gain */ 52 fu16 voph; /* 0x38 - Vop High */ 53 fu16 vopl; /* 0x3a - Vop Low */ 54 fs16 nactual_die; /* 0x3c - nActual Die */ 55 fs16 nactual_heatsink; /* 0x3e - nActual Heatsink */ 56 fs16 nactual_system; /* 0x40 - nActual System */ 57 u16 calibration_flags; /* 0x42 - Calibration flags */ 58 fu16 mdiode; /* 0x44 - Diode M value (scaling factor) */ 59 fs16 bdiode; /* 0x46 - Diode B value (offset) */ 60 fs32 theta_heat_sink; /* 0x48 - Theta heat sink */ 61 u16 rminn_intake_fan; /* 0x4c - Intake fan min RPM */ 62 u16 rmaxn_intake_fan; /* 0x4e - Intake fan max RPM */ 63 u16 rminn_exhaust_fan; /* 0x50 - Exhaust fan min RPM */ 64 u16 rmaxn_exhaust_fan; /* 0x52 - Exhaust fan max RPM */ 65 u8 processor_part_num[8]; /* 0x54 - Processor part number XX pumps min/max */ 66 u32 processor_lot_num; /* 0x5c - Processor lot number */ 67 u8 orig_card_sernum[0x10]; /* 0x60 - Card original serial number */ 68 u8 curr_card_sernum[0x10]; /* 0x70 - Card current serial number */ 69 u8 mlb_sernum[0x18]; /* 0x80 - MLB serial number */ 70 u32 checksum1; /* 0x98 - */ 71 u32 checksum2; /* 0x9c - */ 72 }; /* Total size = 0xa0 */ 73 74 static inline const struct mpu_data *wf_get_mpu(int cpu) 75 { 76 struct device_node *np; 77 char nodename[64]; 78 const void *data; 79 int len; 80 81 /* 82 * prom.c routine for finding a node by path is a bit brain dead 83 * and requires exact @xxx unit numbers. This is a bit ugly but 84 * will work for these machines 85 */ 86 sprintf(nodename, "/u3@0,f8000000/i2c@f8001000/cpuid@a%d", cpu ? 2 : 0); 87 np = of_find_node_by_path(nodename); 88 if (!np) 89 return NULL; 90 data = of_get_property(np, "cpuid", &len); 91 of_node_put(np); 92 if (!data) 93 return NULL; 94 95 /* 96 * We are naughty, we have dropped the reference to the device 97 * node and still return a pointer to the content. We know we 98 * can do that though as this is only ever called on PowerMac 99 * which cannot remove those nodes 100 */ 101 return data; 102 } 103 104 #endif /* __WINDFARM_MPU_H */ 105