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