powerpc/powermac: New windfarm driver for PowerMac G5 (AGP) and Xserve G5

This replaces the old therm_pm72 using the same windfarm infrastructure
that was used for other PowerMac G5 models. The fan speeds and sensors
should now be visible in the same location in sysfs.

The driver is split into separate core modules for PowerMac7,2 (and 7,3)
and RackMac3,1, with a lot of the shared code now in the separate sensor
and control modules.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 105 insertions, 0 deletions

diff --git a/drivers/macintosh/windfarm_mpu.h b/drivers/macintosh/windfarm_mpu.h
new file mode 100644
index 000000000000..046edc8c2ec5
--- /dev/null
+++ b/drivers/macintosh/windfarm_mpu.h
@@ -0,0 +1,105 @@
+/*
+ * Windfarm PowerMac thermal control
+ *
+ * Copyright 2012 Benjamin Herrenschmidt, IBM Corp.
+ *
+ * Released under the term of the GNU GPL v2.
+ */
+
+#ifndef __WINDFARM_MPU_H
+#define __WINDFARM_MPU_H
+
+typedef unsigned short fu16;
+typedef int fs32;
+typedef short fs16;
+
+/* Definition of the MPU data structure which contains per CPU
+ * calibration information (among others) for the G5 machines
+ */
+struct mpu_data
+{
+        u8      signature;              /* 0x00 - EEPROM sig. */
+        u8      bytes_used;             /* 0x01 - Bytes used in eeprom (160 ?) */
+        u8      size;                   /* 0x02 - EEPROM size (256 ?) */
+        u8      version;                /* 0x03 - EEPROM version */
+        u32     data_revision;          /* 0x04 - Dataset revision */
+        u8      processor_bin_code[3];  /* 0x08 - Processor BIN code */
+        u8      bin_code_expansion;     /* 0x0b - ??? (padding ?) */
+        u8      processor_num;          /* 0x0c - Number of CPUs on this MPU */
+        u8      input_mul_bus_div;      /* 0x0d - Clock input multiplier/bus divider */
+        u8      reserved1[2];           /* 0x0e - */
+        u32     input_clk_freq_high;    /* 0x10 - Input clock frequency high */
+        u8      cpu_nb_target_cycles;   /* 0x14 - ??? */
+        u8      cpu_statlat;            /* 0x15 - ??? */
+        u8      cpu_snooplat;           /* 0x16 - ??? */
+        u8      cpu_snoopacc;           /* 0x17 - ??? */
+        u8      nb_paamwin;             /* 0x18 - ??? */
+        u8      nb_statlat;             /* 0x19 - ??? */
+        u8      nb_snooplat;            /* 0x1a - ??? */
+        u8      nb_snoopwin;            /* 0x1b - ??? */
+        u8      api_bus_mode;           /* 0x1c - ??? */
+        u8      reserved2[3];           /* 0x1d - */
+        u32     input_clk_freq_low;     /* 0x20 - Input clock frequency low */
+        u8      processor_card_slot;    /* 0x24 - Processor card slot number */
+        u8      reserved3[2];           /* 0x25 - */
+        u8      padjmax;                /* 0x27 - Max power adjustment (Not in OF!) */
+        u8      ttarget;                /* 0x28 - Target temperature */
+        u8      tmax;                   /* 0x29 - Max temperature */
+        u8      pmaxh;                  /* 0x2a - Max power */
+        u8      tguardband;             /* 0x2b - Guardband temp ??? Hist. len in OSX */
+        fs32    pid_gp;                 /* 0x2c - PID proportional gain */
+        fs32    pid_gr;                 /* 0x30 - PID reset gain */
+        fs32    pid_gd;                 /* 0x34 - PID derivative gain */
+        fu16    voph;                   /* 0x38 - Vop High */
+        fu16    vopl;                   /* 0x3a - Vop Low */
+        fs16    nactual_die;            /* 0x3c - nActual Die */
+        fs16    nactual_heatsink;       /* 0x3e - nActual Heatsink */
+        fs16    nactual_system;         /* 0x40 - nActual System */
+        u16     calibration_flags;      /* 0x42 - Calibration flags */
+        fu16    mdiode;                 /* 0x44 - Diode M value (scaling factor) */
+        fs16    bdiode;                 /* 0x46 - Diode B value (offset) */
+        fs32    theta_heat_sink;        /* 0x48 - Theta heat sink */
+        u16     rminn_intake_fan;       /* 0x4c - Intake fan min RPM */
+        u16     rmaxn_intake_fan;       /* 0x4e - Intake fan max RPM */
+        u16     rminn_exhaust_fan;      /* 0x50 - Exhaust fan min RPM */
+        u16     rmaxn_exhaust_fan;      /* 0x52 - Exhaust fan max RPM */
+        u8      processor_part_num[8];  /* 0x54 - Processor part number XX pumps min/max */
+        u32     processor_lot_num;      /* 0x5c - Processor lot number */
+        u8      orig_card_sernum[0x10]; /* 0x60 - Card original serial number */
+        u8      curr_card_sernum[0x10]; /* 0x70 - Card current serial number */
+        u8      mlb_sernum[0x18];       /* 0x80 - MLB serial number */
+        u32     checksum1;              /* 0x98 - */
+        u32     checksum2;              /* 0x9c - */    
+}; /* Total size = 0xa0 */
+
+static inline const struct mpu_data *wf_get_mpu(int cpu)
+{
+        struct device_node *np;
+        char nodename[64];
+        const void *data;
+        int len;
+
+        /*
+         * prom.c routine for finding a node by path is a bit brain dead
+         * and requires exact @xxx unit numbers. This is a bit ugly but
+         * will work for these machines
+         */
+        sprintf(nodename, "/u3@0,f8000000/i2c@f8001000/cpuid@a%d", cpu ? 2 : 0);
+        np = of_find_node_by_path(nodename);
+        if (!np)
+                return NULL;
+        data = of_get_property(np, "cpuid", &len);      
+        of_node_put(np);
+        if (!data)
+                return NULL;
+
+        /*
+         * We are naughty, we have dropped the reference to the device
+         * node and still return a pointer to the content. We know we
+         * can do that though as this is only ever called on PowerMac
+         * which cannot remove those nodes
+         */
+        return data;
+}
+
+#endif /*  __WINDFARM_MPU_H */