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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Windfarm PowerMac thermal control4 *5 * Copyright 2012 Benjamin Herrenschmidt, IBM Corp.6 */7 8#ifndef __WINDFARM_MPU_H9#define __WINDFARM_MPU_H10 11#include <linux/of.h>12 13typedef unsigned short fu16;14typedef int fs32;15typedef short fs16;16 17/* Definition of the MPU data structure which contains per CPU18 * calibration information (among others) for the G5 machines19 */20struct mpu_data21{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 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 dead85 * and requires exact @xxx unit numbers. This is a bit ugly but86 * will work for these machines87 */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 device99 * node and still return a pointer to the content. We know we100 * can do that though as this is only ever called on PowerMac101 * which cannot remove those nodes102 */103 return data;104}105 106#endif /* __WINDFARM_MPU_H */107