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 */