/* SPDX-License-Identifier: GPL-2.0-only */ /* * Windfarm PowerMac thermal control * * Copyright 2012 Benjamin Herrenschmidt, IBM Corp. */ #ifndef __WINDFARM_MPU_H #define __WINDFARM_MPU_H #include <linux/of.h> typedef unsigned short fu16; typedef int fs32; typedef short fs16; /* Definition of the MPU data structure which contains per CPU * calibration information (among others) for the G5 machines */ struct mpu_data { u8 signature; /* 0x00 - EEPROM sig. */ u8 bytes_used; /* 0x01 - Bytes used in eeprom (160 ?) */ u8 size; /* 0x02 - EEPROM size (256 ?) */ u8 version; /* 0x03 - EEPROM version */ u32 data_revision; /* 0x04 - Dataset revision */ u8 processor_bin_code[3]; /* 0x08 - Processor BIN code */ u8 bin_code_expansion; /* 0x0b - ??? (padding ?) */ u8 processor_num; /* 0x0c - Number of CPUs on this MPU */ u8 input_mul_bus_div; /* 0x0d - Clock input multiplier/bus divider */ u8 reserved1[2]; /* 0x0e - */ u32 input_clk_freq_high; /* 0x10 - Input clock frequency high */ u8 cpu_nb_target_cycles; /* 0x14 - ??? */ u8 cpu_statlat; /* 0x15 - ??? */ u8 cpu_snooplat; /* 0x16 - ??? */ u8 cpu_snoopacc; /* 0x17 - ??? */ u8 nb_paamwin; /* 0x18 - ??? */ u8 nb_statlat; /* 0x19 - ??? */ u8 nb_snooplat; /* 0x1a - ??? */ u8 nb_snoopwin; /* 0x1b - ??? */ u8 api_bus_mode; /* 0x1c - ??? */ u8 reserved2[3]; /* 0x1d - */ u32 input_clk_freq_low; /* 0x20 - Input clock frequency low */ u8 processor_card_slot; /* 0x24 - Processor card slot number */ u8 reserved3[2]; /* 0x25 - */ u8 padjmax; /* 0x27 - Max power adjustment (Not in OF!) */ u8 ttarget; /* 0x28 - Target temperature */ u8 tmax; /* 0x29 - Max temperature */ u8 pmaxh; /* 0x2a - Max power */ u8 tguardband; /* 0x2b - Guardband temp ??? Hist. len in OSX */ fs32 pid_gp; /* 0x2c - PID proportional gain */ fs32 pid_gr; /* 0x30 - PID reset gain */ fs32 pid_gd; /* 0x34 - PID derivative gain */ fu16 voph; /* 0x38 - Vop High */ fu16 vopl; /* 0x3a - Vop Low */ fs16 nactual_die; /* 0x3c - nActual Die */ fs16 nactual_heatsink; /* 0x3e - nActual Heatsink */ fs16 nactual_system; /* 0x40 - nActual System */ u16 calibration_flags; /* 0x42 - Calibration flags */ fu16 mdiode; /* 0x44 - Diode M value (scaling factor) */ fs16 bdiode; /* 0x46 - Diode B value (offset) */ fs32 theta_heat_sink; /* 0x48 - Theta heat sink */ u16 rminn_intake_fan; /* 0x4c - Intake fan min RPM */ u16 rmaxn_intake_fan; /* 0x4e - Intake fan max RPM */ u16 rminn_exhaust_fan; /* 0x50 - Exhaust fan min RPM */ u16 rmaxn_exhaust_fan; /* 0x52 - Exhaust fan max RPM */ u8 processor_part_num[8]; /* 0x54 - Processor part number XX pumps min/max */ u32 processor_lot_num; /* 0x5c - Processor lot number */ u8 orig_card_sernum[0x10]; /* 0x60 - Card original serial number */ u8 curr_card_sernum[0x10]; /* 0x70 - Card current serial number */ u8 mlb_sernum[0x18]; /* 0x80 - MLB serial number */ u32 checksum1; /* 0x98 - */ u32 checksum2; /* 0x9c - */ }; /* Total size = 0xa0 */ static inline const struct mpu_data *wf_get_mpu(int cpu) { struct device_node *np; char nodename[64]; const void *data; int len; /* * prom.c routine for finding a node by path is a bit brain dead * and requires exact @xxx unit numbers. This is a bit ugly but * will work for these machines */ sprintf(nodename, "/u3@0,f8000000/i2c@f8001000/cpuid@a%d", cpu ? 2 : 0); np = of_find_node_by_path(nodename); if (!np) return NULL; data = of_get_property(np, "cpuid", &len); of_node_put(np); if (!data) return NULL; /* * We are naughty, we have dropped the reference to the device * node and still return a pointer to the content. We know we * can do that though as this is only ever called on PowerMac * which cannot remove those nodes */ return data; } #endif /* __WINDFARM_MPU_H */
