linux/drivers/macintosh/windfarm_mpu.h
<<
>>
Prefs
   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
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.