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 | |
76 | static 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(buf: nodename, fmt: "/u3@0,f8000000/i2c@f8001000/cpuid@a%d" , cpu ? 2 : 0); |
89 | np = of_find_node_by_path(path: nodename); |
90 | if (!np) |
91 | return NULL; |
92 | data = of_get_property(node: np, name: "cpuid" , lenp: &len); |
93 | of_node_put(node: 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 | |