1/*
2 * Windfarm PowerMac thermal control
3 *
4 * Copyright 2012 Benjamin Herrenschmidt, IBM Corp.
5 *
6 * Released under the term of the GNU GPL v2.
7 */
8
9#ifndef __WINDFARM_MPU_H
10#define __WINDFARM_MPU_H
11
12typedef unsigned short fu16;
13typedef int fs32;
14typedef short fs16;
15
16/* Definition of the MPU data structure which contains per CPU
17 * calibration information (among others) for the G5 machines
18 */
19struct mpu_data
20{
21	u8	signature;		/* 0x00 - EEPROM sig. */
22	u8	bytes_used;		/* 0x01 - Bytes used in eeprom (160 ?) */
23	u8	size;			/* 0x02 - EEPROM size (256 ?) */
24	u8	version;		/* 0x03 - EEPROM version */
25	u32	data_revision;		/* 0x04 - Dataset revision */
26	u8	processor_bin_code[3];	/* 0x08 - Processor BIN code */
27	u8	bin_code_expansion;	/* 0x0b - ??? (padding ?) */
28	u8	processor_num;		/* 0x0c - Number of CPUs on this MPU */
29	u8	input_mul_bus_div;	/* 0x0d - Clock input multiplier/bus divider */
30	u8	reserved1[2];		/* 0x0e - */
31	u32	input_clk_freq_high;	/* 0x10 - Input clock frequency high */
32	u8	cpu_nb_target_cycles;	/* 0x14 - ??? */
33	u8	cpu_statlat;		/* 0x15 - ??? */
34	u8	cpu_snooplat;		/* 0x16 - ??? */
35	u8	cpu_snoopacc;		/* 0x17 - ??? */
36	u8	nb_paamwin;		/* 0x18 - ??? */
37	u8	nb_statlat;		/* 0x19 - ??? */
38	u8	nb_snooplat;		/* 0x1a - ??? */
39	u8	nb_snoopwin;		/* 0x1b - ??? */
40	u8	api_bus_mode;		/* 0x1c - ??? */
41	u8	reserved2[3];		/* 0x1d - */
42	u32	input_clk_freq_low;	/* 0x20 - Input clock frequency low */
43	u8	processor_card_slot;	/* 0x24 - Processor card slot number */
44	u8	reserved3[2];		/* 0x25 - */
45	u8	padjmax;       		/* 0x27 - Max power adjustment (Not in OF!) */
46	u8	ttarget;		/* 0x28 - Target temperature */
47	u8	tmax;			/* 0x29 - Max temperature */
48	u8	pmaxh;			/* 0x2a - Max power */
49	u8	tguardband;		/* 0x2b - Guardband temp ??? Hist. len in OSX */
50	fs32	pid_gp;			/* 0x2c - PID proportional gain */
51	fs32	pid_gr;			/* 0x30 - PID reset gain */
52	fs32	pid_gd;			/* 0x34 - PID derivative gain */
53	fu16	voph;			/* 0x38 - Vop High */
54	fu16	vopl;			/* 0x3a - Vop Low */
55	fs16	nactual_die;		/* 0x3c - nActual Die */
56	fs16	nactual_heatsink;	/* 0x3e - nActual Heatsink */
57	fs16	nactual_system;		/* 0x40 - nActual System */
58	u16	calibration_flags;	/* 0x42 - Calibration flags */
59	fu16	mdiode;			/* 0x44 - Diode M value (scaling factor) */
60	fs16	bdiode;			/* 0x46 - Diode B value (offset) */
61	fs32	theta_heat_sink;	/* 0x48 - Theta heat sink */
62	u16	rminn_intake_fan;	/* 0x4c - Intake fan min RPM */
63	u16	rmaxn_intake_fan;	/* 0x4e - Intake fan max RPM */
64	u16	rminn_exhaust_fan;	/* 0x50 - Exhaust fan min RPM */
65	u16	rmaxn_exhaust_fan;	/* 0x52 - Exhaust fan max RPM */
66	u8	processor_part_num[8];	/* 0x54 - Processor part number XX pumps min/max */
67	u32	processor_lot_num;	/* 0x5c - Processor lot number */
68	u8	orig_card_sernum[0x10];	/* 0x60 - Card original serial number */
69	u8	curr_card_sernum[0x10];	/* 0x70 - Card current serial number */
70	u8	mlb_sernum[0x18];	/* 0x80 - MLB serial number */
71	u32	checksum1;		/* 0x98 - */
72	u32	checksum2;		/* 0x9c - */
73}; /* Total size = 0xa0 */
74
75static inline const struct mpu_data *wf_get_mpu(int cpu)
76{
77	struct device_node *np;
78	char nodename[64];
79	const void *data;
80	int len;
81
82	/*
83	 * prom.c routine for finding a node by path is a bit brain dead
84	 * and requires exact @xxx unit numbers. This is a bit ugly but
85	 * will work for these machines
86	 */
87	sprintf(nodename, "/u3@0,f8000000/i2c@f8001000/cpuid@a%d", cpu ? 2 : 0);
88	np = of_find_node_by_path(nodename);
89	if (!np)
90		return NULL;
91	data = of_get_property(np, "cpuid", &len);
92	of_node_put(np);
93	if (!data)
94		return NULL;
95
96	/*
97	 * We are naughty, we have dropped the reference to the device
98	 * node and still return a pointer to the content. We know we
99	 * can do that though as this is only ever called on PowerMac
100	 * which cannot remove those nodes
101	 */
102	return data;
103}
104
105#endif /*  __WINDFARM_MPU_H */
106