include/asm-sparc64/mostek.h

   1 /* $Id: mostek.h,v 1.4 2001/01/11 15:07:09 davem Exp $
   2  * mostek.h:  Describes the various Mostek time of day clock registers.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
   6  */
   7
   8 #ifndef _SPARC64_MOSTEK_H
   9 #define _SPARC64_MOSTEK_H
  10
  11 #include <asm/idprom.h>
  12
  13 /*       M48T02 Register Map (adapted from Sun NVRAM/Hostid FAQ)
  14  *
  15  *                             Data
  16  * Address                                                 Function
  17  *        Bit 7 Bit 6 Bit 5 Bit 4Bit 3 Bit 2 Bit 1 Bit 0
  18  *   7ff  -     -     -     -    -     -     -     -       Year 00-99
  19  *   7fe  0     0     0     -    -     -     -     -      Month 01-12
  20  *   7fd  0     0     -     -    -     -     -     -       Date 01-31
  21  *   7fc  0     FT    0     0    0     -     -     -        Day 01-07
  22  *   7fb  KS    0     -     -    -     -     -     -      Hours 00-23
  23  *   7fa  0     -     -     -    -     -     -     -    Minutes 00-59
  24  *   7f9  ST    -     -     -    -     -     -     -    Seconds 00-59
  25  *   7f8  W     R     S     -    -     -     -     -    Control
  26  *
  27  *   * ST is STOP BIT
  28  *   * W is WRITE BIT
  29  *   * R is READ BIT
  30  *   * S is SIGN BIT
  31  *   * FT is FREQ TEST BIT
  32  *   * KS is KICK START BIT
  33  */
  34
  35 /* The Mostek 48t02 real time clock and NVRAM chip. The registers
  36  * other than the control register are in binary coded decimal. Some
  37  * control bits also live outside the control register.
  38  *
  39  * We now deal with physical addresses for I/O to the chip. -DaveM
  40  */
  41 static __inline__ u8 mostek_read(void __iomem *addr)
  42 {
  43         u8 ret;
  44
  45         __asm__ __volatile__("lduba     [%1] %2, %0"
  46                              : "=r" (ret)
  47                              : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E));
  48         return ret;
  49 }
  50
  51 static __inline__ void mostek_write(void __iomem *addr, u8 val)
  52 {
  53         __asm__ __volatile__("stba      %0, [%1] %2"
  54                              : /* no outputs */
  55                              : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E));
  56 }
  57
  58 #define MOSTEK_EEPROM           0x0000UL
  59 #define MOSTEK_IDPROM           0x07d8UL
  60 #define MOSTEK_CREG             0x07f8UL
  61 #define MOSTEK_SEC              0x07f9UL
  62 #define MOSTEK_MIN              0x07faUL
  63 #define MOSTEK_HOUR             0x07fbUL
  64 #define MOSTEK_DOW              0x07fcUL
  65 #define MOSTEK_DOM              0x07fdUL
  66 #define MOSTEK_MONTH            0x07feUL
  67 #define MOSTEK_YEAR             0x07ffUL
  68
  69 extern spinlock_t mostek_lock;
  70 extern void __iomem *mstk48t02_regs;
  71
  72 /* Control register values. */
  73 #define MSTK_CREG_WRITE 0x80    /* Must set this before placing values. */
  74 #define MSTK_CREG_READ  0x40    /* Stop updates to allow a clean read. */
  75 #define MSTK_CREG_SIGN  0x20    /* Slow/speed clock in calibration mode. */
  76
  77 /* Control bits that live in the other registers. */
  78 #define MSTK_STOP       0x80    /* Stop the clock oscillator. (sec) */
  79 #define MSTK_KICK_START 0x80    /* Kick start the clock chip. (hour) */
  80 #define MSTK_FREQ_TEST  0x40    /* Frequency test mode. (day) */
  81
  82 #define MSTK_YEAR_ZERO       1968   /* If year reg has zero, it is 1968. */
  83 #define MSTK_CVT_YEAR(yr)  ((yr) + MSTK_YEAR_ZERO)
  84
  85 /* Masks that define how much space each value takes up. */
  86 #define MSTK_SEC_MASK   0x7f
  87 #define MSTK_MIN_MASK   0x7f
  88 #define MSTK_HOUR_MASK  0x3f
  89 #define MSTK_DOW_MASK   0x07
  90 #define MSTK_DOM_MASK   0x3f
  91 #define MSTK_MONTH_MASK 0x1f
  92 #define MSTK_YEAR_MASK  0xffU
  93
  94 /* Binary coded decimal conversion macros. */
  95 #define MSTK_REGVAL_TO_DECIMAL(x)  (((x) & 0x0F) + 0x0A * ((x) >> 0x04))
  96 #define MSTK_DECIMAL_TO_REGVAL(x)  ((((x) / 0x0A) << 0x04) + ((x) % 0x0A))
  97
  98 /* Generic register set and get macros for internal use. */
  99 #define MSTK_GET(regs,name)     \
 100         (MSTK_REGVAL_TO_DECIMAL(mostek_read(regs + MOSTEK_ ## name) & MSTK_ ## name ## _MASK))
 101 #define MSTK_SET(regs,name,value) \
 102 do {    u8 __val = mostek_read(regs + MOSTEK_ ## name); \
 103         __val &= ~(MSTK_ ## name ## _MASK); \
 104         __val |= (MSTK_DECIMAL_TO_REGVAL(value) & \
 105                   (MSTK_ ## name ## _MASK)); \
 106         mostek_write(regs + MOSTEK_ ## name, __val); \
 107 } while(0)
 108
 109 /* Macros to make register access easier on our fingers. These give you
 110  * the decimal value of the register requested if applicable. You pass
 111  * the a pointer to a 'struct mostek48t02'.
 112  */
 113 #define MSTK_REG_CREG(regs)     (mostek_read((regs) + MOSTEK_CREG))
 114 #define MSTK_REG_SEC(regs)      MSTK_GET(regs,SEC)
 115 #define MSTK_REG_MIN(regs)      MSTK_GET(regs,MIN)
 116 #define MSTK_REG_HOUR(regs)     MSTK_GET(regs,HOUR)
 117 #define MSTK_REG_DOW(regs)      MSTK_GET(regs,DOW)
 118 #define MSTK_REG_DOM(regs)      MSTK_GET(regs,DOM)
 119 #define MSTK_REG_MONTH(regs)    MSTK_GET(regs,MONTH)
 120 #define MSTK_REG_YEAR(regs)     MSTK_GET(regs,YEAR)
 121
 122 #define MSTK_SET_REG_SEC(regs,value)    MSTK_SET(regs,SEC,value)
 123 #define MSTK_SET_REG_MIN(regs,value)    MSTK_SET(regs,MIN,value)
 124 #define MSTK_SET_REG_HOUR(regs,value)   MSTK_SET(regs,HOUR,value)
 125 #define MSTK_SET_REG_DOW(regs,value)    MSTK_SET(regs,DOW,value)
 126 #define MSTK_SET_REG_DOM(regs,value)    MSTK_SET(regs,DOM,value)
 127 #define MSTK_SET_REG_MONTH(regs,value)  MSTK_SET(regs,MONTH,value)
 128 #define MSTK_SET_REG_YEAR(regs,value)   MSTK_SET(regs,YEAR,value)
 129
 130
 131 /* The Mostek 48t08 clock chip. Found on Sun4m's I think. It has the
 132  * same (basically) layout of the 48t02 chip except for the extra
 133  * NVRAM on board (8 KB against the 48t02's 2 KB).
 134  */
 135 #define MOSTEK_48T08_OFFSET     0x0000UL        /* Lower NVRAM portions */
 136 #define MOSTEK_48T08_48T02      0x1800UL        /* Offset to 48T02 chip */
 137
 138 /* SUN5 systems usually have 48t59 model clock chipsets.  But we keep the older
 139  * clock chip definitions around just in case.
 140  */
 141 #define MOSTEK_48T59_OFFSET     0x0000UL        /* Lower NVRAM portions */
 142 #define MOSTEK_48T59_48T02      0x1800UL        /* Offset to 48T02 chip */
 143
 144 #endif /* !(_SPARC64_MOSTEK_H) */