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Diffstat (limited to '')
| -rw-r--r-- | drivers/macintosh/windfarm_mpu.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/macintosh/windfarm_mpu.h b/drivers/macintosh/windfarm_mpu.h new file mode 100644 index 000000000..b5ce347d1 --- /dev/null +++ b/drivers/macintosh/windfarm_mpu.h @@ -0,0 +1,106 @@ +/* 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 */ |