1 files changed, 153 insertions, 0 deletions
diff --git a/include/asm-ppc/prep_nvram.h b/include/asm-ppc/prep_nvram.h
new file mode 100644
index 00000000000..6dbc36a84df
--- /dev/null
+++ b/include/asm-ppc/prep_nvram.h
@@ -0,0 +1,153 @@
+/*
+ * PreP compliant NVRAM access
+ */
+
+/* Corey Minyard (minyard@acm.org) - Stolen from PReP book.   Per the
+   license I must say:
+     (C) Copyright (Corey Minyard), (1998).  All rights reserved
+ */
+
+/* Structure map for NVRAM on PowerPC Reference Platform */
+/* All fields are either character/byte strings which are valid either
+  endian or they are big-endian numbers.
+
+  There are a number of Date and Time fields which are in RTC format,
+  big-endian. These are stored in UT (GMT).
+
+  For enum's: if given in hex then they are bit significant, i.e. only
+  one bit is on for each enum.
+*/
+#ifdef __KERNEL__
+#ifndef _PPC_PREP_NVRAM_H
+#define _PPC_PREP_NVRAM_H
+
+#define MAX_PREP_NVRAM 0x8000
+#define PREP_NVRAM_AS0	0x74
+#define PREP_NVRAM_AS1	0x75
+#define PREP_NVRAM_DATA	0x77
+
+#define NVSIZE 4096	/* size of NVRAM */
+#define OSAREASIZE 512	/* size of OSArea space */
+#define CONFSIZE 1024	/* guess at size of Configuration space */
+
+typedef struct _SECURITY {
+  unsigned long BootErrCnt;	    /* Count of boot password errors */
+  unsigned long ConfigErrCnt;	    /* Count of config password errors */
+  unsigned long BootErrorDT[2];	    /* Date&Time from RTC of last error in pw */
+  unsigned long ConfigErrorDT[2];   /* Date&Time from RTC of last error in pw */
+  unsigned long BootCorrectDT[2];   /* Date&Time from RTC of last correct pw */
+  unsigned long ConfigCorrectDT[2]; /* Date&Time from RTC of last correct pw */
+  unsigned long BootSetDT[2];	    /* Date&Time from RTC of last set of pw */
+  unsigned long ConfigSetDT[2];	    /* Date&Time from RTC of last set of pw */
+  unsigned char Serial[16];	    /* Box serial number */
+} SECURITY;
+
+typedef enum _OS_ID {
+  Unknown = 0,
+  Firmware = 1,
+  AIX = 2,
+  NT = 3,
+  MKOS2 = 4,
+  MKAIX = 5,
+  Taligent = 6,
+  Solaris = 7,
+  MK = 12
+} OS_ID;
+
+typedef struct _ERROR_LOG {
+  unsigned char ErrorLogEntry[40]; /* To be architected */
+} ERROR_LOG;
+
+typedef enum _BOOT_STATUS {
+  BootStarted = 0x01,
+  BootFinished = 0x02,
+  RestartStarted = 0x04,
+  RestartFinished = 0x08,
+  PowerFailStarted = 0x10,
+  PowerFailFinished = 0x20,
+  ProcessorReady = 0x40,
+  ProcessorRunning = 0x80,
+  ProcessorStart = 0x0100
+} BOOT_STATUS;
+
+typedef struct _RESTART_BLOCK {
+  unsigned short Version;
+  unsigned short Revision;
+  unsigned long ResumeReserve1[2];
+  volatile unsigned long BootStatus;
+  unsigned long CheckSum; /* Checksum of RESTART_BLOCK */
+  void * RestartAddress;
+  void * SaveAreaAddr;
+  unsigned long SaveAreaLength;
+} RESTART_BLOCK;
+
+typedef enum _OSAREA_USAGE {
+  Empty = 0,
+  Used = 1
+} OSAREA_USAGE;
+
+typedef enum _PM_MODE {
+  Suspend = 0x80, /* Part of state is in memory */
+  Normal = 0x00   /* No power management in effect */
+} PMMODE;
+
+typedef struct _HEADER {
+  unsigned short Size;       /* NVRAM size in K(1024) */
+  unsigned char Version;     /* Structure map different */
+  unsigned char Revision;    /* Structure map the same -may
+                                be new values in old fields
+                                in other words old code still works */
+  unsigned short Crc1;       /* check sum from beginning of nvram to OSArea */
+  unsigned short Crc2;       /* check sum of config */
+  unsigned char LastOS;      /* OS_ID */
+  unsigned char Endian;      /* B if big endian, L if little endian */
+  unsigned char OSAreaUsage; /* OSAREA_USAGE */
+  unsigned char PMMode;      /* Shutdown mode */
+  RESTART_BLOCK RestartBlock;
+  SECURITY Security;
+  ERROR_LOG ErrorLog[2];
+
+  /* Global Environment information */
+  void * GEAddress;
+  unsigned long GELength;
+
+  /* Date&Time from RTC of last change to Global Environment */
+  unsigned long GELastWriteDT[2];
+
+  /* Configuration information */
+  void * ConfigAddress;
+  unsigned long ConfigLength;
+
+  /* Date&Time from RTC of last change to Configuration */
+  unsigned long ConfigLastWriteDT[2];
+  unsigned long ConfigCount; /* Count of entries in Configuration */
+
+  /* OS dependent temp area */
+  void * OSAreaAddress;
+  unsigned long OSAreaLength;
+
+  /* Date&Time from RTC of last change to OSAreaArea */
+  unsigned long OSAreaLastWriteDT[2];
+} HEADER;
+
+/* Here is the whole map of the NVRAM */
+typedef struct _NVRAM_MAP {
+  HEADER Header;
+  unsigned char GEArea[NVSIZE-CONFSIZE-OSAREASIZE-sizeof(HEADER)];
+  unsigned char OSArea[OSAREASIZE];
+  unsigned char ConfigArea[CONFSIZE];
+} NVRAM_MAP;
+
+/* Routines to manipulate the NVRAM */
+void init_prep_nvram(void);
+char *prep_nvram_get_var(const char *name);
+char *prep_nvram_first_var(void);
+char *prep_nvram_next_var(char *name);
+
+/* Routines to read and write directly to the NVRAM */
+unsigned char prep_nvram_read_val(int addr);
+void prep_nvram_write_val(int           addr,
+			  unsigned char val);
+
+#endif /* _PPC_PREP_NVRAM_H */
+#endif /* __KERNEL__ */