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 #include <linux/of.h> 12 13 typedef unsigned short fu16; 14 typedef int fs32; 15 typedef short fs16; 16 17 /* Definition of the MPU data structure which contains per CPU 18 * calibration information (among others) for the G5 machines 19 */ 20 struct mpu_data 21 { 22 u8 signature; /* 0x00 - EEPROM sig. */ 23 u8 bytes_used; /* 0x01 - Bytes used in eeprom (160 ?) */ 24 u8 size; /* 0x02 - EEPROM size (256 ?) */ 25 u8 version; /* 0x03 - EEPROM version */ 26 u32 data_revision; /* 0x04 - Dataset revision */ 27 u8 processor_bin_code[3]; /* 0x08 - Processor BIN code */ 28 u8 bin_code_expansion; /* 0x0b - ??? (padding ?) */ 29 u8 processor_num; /* 0x0c - Number of CPUs on this MPU */ 30 u8 input_mul_bus_div; /* 0x0d - Clock input multiplier/bus divider */ 31 u8 reserved1[2]; /* 0x0e - */ 32 u32 input_clk_freq_high; /* 0x10 - Input clock frequency high */ 33 u8 cpu_nb_target_cycles; /* 0x14 - ??? */ 34 u8 cpu_statlat; /* 0x15 - ??? */ 35 u8 cpu_snooplat; /* 0x16 - ??? */ 36 u8 cpu_snoopacc; /* 0x17 - ??? */ 37 u8 nb_paamwin; /* 0x18 - ??? */ 38 u8 nb_statlat; /* 0x19 - ??? */ 39 u8 nb_snooplat; /* 0x1a - ??? */ 40 u8 nb_snoopwin; /* 0x1b - ??? */ 41 u8 api_bus_mode; /* 0x1c - ??? */ 42 u8 reserved2[3]; /* 0x1d - */ 43 u32 input_clk_freq_low; /* 0x20 - Input clock frequency low */ 44 u8 processor_card_slot; /* 0x24 - Processor card slot number */ 45 u8 reserved3[2]; /* 0x25 - */ 46 u8 padjmax; /* 0x27 - Max power adjustment (Not in OF!) */ 47 u8 ttarget; /* 0x28 - Target temperature */ 48 u8 tmax; /* 0x29 - Max temperature */ 49 u8 pmaxh; /* 0x2a - Max power */ 50 u8 tguardband; /* 0x2b - Guardband temp ??? Hist. len in OSX */ 51 fs32 pid_gp; /* 0x2c - PID proportional gain */ 52 fs32 pid_gr; /* 0x30 - PID reset gain */ 53 fs32 pid_gd; /* 0x34 - PID derivative gain */ 54 fu16 voph; /* 0x38 - Vop High */ 55 fu16 vopl; /* 0x3a - Vop Low */ 56 fs16 nactual_die; /* 0x3c - nActual Die */ 57 fs16 nactual_heatsink; /* 0x3e - nActual Heatsink */ 58 fs16 nactual_system; /* 0x40 - nActual System */ 59 u16 calibration_flags; /* 0x42 - Calibration flags */ 60 fu16 mdiode; /* 0x44 - Diode M value (scaling factor) */ 61 fs16 bdiode; /* 0x46 - Diode B value (offset) */ 62 fs32 theta_heat_sink; /* 0x48 - Theta heat sink */ 63 u16 rminn_intake_fan; /* 0x4c - Intake fan min RPM */ 64 u16 rmaxn_intake_fan; /* 0x4e - Intake fan max RPM */ 65 u16 rminn_exhaust_fan; /* 0x50 - Exhaust fan min RPM */ 66 u16 rmaxn_exhaust_fan; /* 0x52 - Exhaust fan max RPM */ 67 u8 processor_part_num[8]; /* 0x54 - Processor part number XX pumps min/max */ 68 u32 processor_lot_num; /* 0x5c - Processor lot number */ 69 u8 orig_card_sernum[0x10]; /* 0x60 - Card original serial number */ 70 u8 curr_card_sernum[0x10]; /* 0x70 - Card current serial number */ 71 u8 mlb_sernum[0x18]; /* 0x80 - MLB serial number */ 72 u32 checksum1; /* 0x98 - */ 73 u32 checksum2; /* 0x9c - */ 74 }; /* Total size = 0xa0 */ 75 wf_get_mpu(int cpu)76static inline const struct mpu_data *wf_get_mpu(int cpu) 77 { 78 struct device_node *np; 79 char nodename[64]; 80 const void *data; 81 int len; 82 83 /* 84 * prom.c routine for finding a node by path is a bit brain dead 85 * and requires exact @xxx unit numbers. This is a bit ugly but 86 * will work for these machines 87 */ 88 sprintf(nodename, "/u3@0,f8000000/i2c@f8001000/cpuid@a%d", cpu ? 2 : 0); 89 np = of_find_node_by_path(nodename); 90 if (!np) 91 return NULL; 92 data = of_get_property(np, "cpuid", &len); 93 of_node_put(np); 94 if (!data) 95 return NULL; 96 97 /* 98 * We are naughty, we have dropped the reference to the device 99 * node and still return a pointer to the content. We know we 100 * can do that though as this is only ever called on PowerMac 101 * which cannot remove those nodes 102 */ 103 return data; 104 } 105 106 #endif /* __WINDFARM_MPU_H */ 107