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mostek_64.h

/* mostek.h:  Describes the various Mostek time of day clock registers.
 *
 * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
 * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
 */

#ifndef _SPARC64_MOSTEK_H
#define _SPARC64_MOSTEK_H

#include <asm/idprom.h>

/*       M48T02 Register Map (adapted from Sun NVRAM/Hostid FAQ)
 *
 *                             Data
 * Address                                                 Function
 *        Bit 7 Bit 6 Bit 5 Bit 4Bit 3 Bit 2 Bit 1 Bit 0
 *   7ff  -     -     -     -    -     -     -     -       Year 00-99
 *   7fe  0     0     0     -    -     -     -     -      Month 01-12
 *   7fd  0     0     -     -    -     -     -     -       Date 01-31
 *   7fc  0     FT    0     0    0     -     -     -        Day 01-07
 *   7fb  KS    0     -     -    -     -     -     -      Hours 00-23
 *   7fa  0     -     -     -    -     -     -     -    Minutes 00-59
 *   7f9  ST    -     -     -    -     -     -     -    Seconds 00-59
 *   7f8  W     R     S     -    -     -     -     -    Control
 *
 *   * ST is STOP BIT
 *   * W is WRITE BIT
 *   * R is READ BIT
 *   * S is SIGN BIT
 *   * FT is FREQ TEST BIT
 *   * KS is KICK START BIT
 */

/* The Mostek 48t02 real time clock and NVRAM chip. The registers
 * other than the control register are in binary coded decimal. Some
 * control bits also live outside the control register.
 *
 * We now deal with physical addresses for I/O to the chip. -DaveM
 */
static inline u8 mostek_read(void __iomem *addr)
{
      u8 ret;

      __asm__ __volatile__("lduba   [%1] %2, %0"
                       : "=r" (ret)
                       : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E));
      return ret;
}

static inline void mostek_write(void __iomem *addr, u8 val)
{
      __asm__ __volatile__("stba    %0, [%1] %2"
                       : /* no outputs */
                       : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E));
}

#define MOSTEK_EEPROM         0x0000UL
#define MOSTEK_IDPROM         0x07d8UL
#define MOSTEK_CREG           0x07f8UL
#define MOSTEK_SEC            0x07f9UL
#define MOSTEK_MIN            0x07faUL
#define MOSTEK_HOUR           0x07fbUL
#define MOSTEK_DOW            0x07fcUL
#define MOSTEK_DOM            0x07fdUL
#define MOSTEK_MONTH          0x07feUL
#define MOSTEK_YEAR           0x07ffUL

extern spinlock_t mostek_lock;
extern void __iomem *mstk48t02_regs;

/* Control register values. */
#define     MSTK_CREG_WRITE   0x80  /* Must set this before placing values. */
#define     MSTK_CREG_READ    0x40  /* Stop updates to allow a clean read. */
#define     MSTK_CREG_SIGN    0x20  /* Slow/speed clock in calibration mode. */

/* Control bits that live in the other registers. */
#define     MSTK_STOP   0x80  /* Stop the clock oscillator. (sec) */
#define     MSTK_KICK_START   0x80  /* Kick start the clock chip. (hour) */
#define MSTK_FREQ_TEST  0x40  /* Frequency test mode. (day) */

#define MSTK_YEAR_ZERO       1968   /* If year reg has zero, it is 1968. */
#define MSTK_CVT_YEAR(yr)  ((yr) + MSTK_YEAR_ZERO)

/* Masks that define how much space each value takes up. */
#define     MSTK_SEC_MASK     0x7f
#define     MSTK_MIN_MASK     0x7f
#define     MSTK_HOUR_MASK    0x3f
#define     MSTK_DOW_MASK     0x07
#define     MSTK_DOM_MASK     0x3f
#define     MSTK_MONTH_MASK   0x1f
#define     MSTK_YEAR_MASK    0xffU

/* Binary coded decimal conversion macros. */
#define MSTK_REGVAL_TO_DECIMAL(x)  (((x) & 0x0F) + 0x0A * ((x) >> 0x04))
#define MSTK_DECIMAL_TO_REGVAL(x)  ((((x) / 0x0A) << 0x04) + ((x) % 0x0A))

/* Generic register set and get macros for internal use. */
#define MSTK_GET(regs,name)   \
      (MSTK_REGVAL_TO_DECIMAL(mostek_read(regs + MOSTEK_ ## name) & MSTK_ ## name ## _MASK))
#define MSTK_SET(regs,name,value) \
do {  u8 __val = mostek_read(regs + MOSTEK_ ## name); \
      __val &= ~(MSTK_ ## name ## _MASK); \
      __val |= (MSTK_DECIMAL_TO_REGVAL(value) & \
              (MSTK_ ## name ## _MASK)); \
      mostek_write(regs + MOSTEK_ ## name, __val); \
} while(0)

/* Macros to make register access easier on our fingers. These give you
 * the decimal value of the register requested if applicable. You pass
 * the a pointer to a 'struct mostek48t02'.
 */
#define     MSTK_REG_CREG(regs)     (mostek_read((regs) + MOSTEK_CREG))
#define     MSTK_REG_SEC(regs)      MSTK_GET(regs,SEC)
#define     MSTK_REG_MIN(regs)      MSTK_GET(regs,MIN)
#define     MSTK_REG_HOUR(regs)     MSTK_GET(regs,HOUR)
#define     MSTK_REG_DOW(regs)      MSTK_GET(regs,DOW)
#define     MSTK_REG_DOM(regs)      MSTK_GET(regs,DOM)
#define     MSTK_REG_MONTH(regs)    MSTK_GET(regs,MONTH)
#define     MSTK_REG_YEAR(regs)     MSTK_GET(regs,YEAR)

#define     MSTK_SET_REG_SEC(regs,value)  MSTK_SET(regs,SEC,value)
#define     MSTK_SET_REG_MIN(regs,value)  MSTK_SET(regs,MIN,value)
#define     MSTK_SET_REG_HOUR(regs,value) MSTK_SET(regs,HOUR,value)
#define     MSTK_SET_REG_DOW(regs,value)  MSTK_SET(regs,DOW,value)
#define     MSTK_SET_REG_DOM(regs,value)  MSTK_SET(regs,DOM,value)
#define     MSTK_SET_REG_MONTH(regs,value)      MSTK_SET(regs,MONTH,value)
#define     MSTK_SET_REG_YEAR(regs,value) MSTK_SET(regs,YEAR,value)


/* The Mostek 48t08 clock chip. Found on Sun4m's I think. It has the
 * same (basically) layout of the 48t02 chip except for the extra
 * NVRAM on board (8 KB against the 48t02's 2 KB).
 */
#define MOSTEK_48T08_OFFSET   0x0000UL    /* Lower NVRAM portions */
#define MOSTEK_48T08_48T02    0x1800UL    /* Offset to 48T02 chip */

/* SUN5 systems usually have 48t59 model clock chipsets.  But we keep the older
 * clock chip definitions around just in case.
 */
#define MOSTEK_48T59_OFFSET   0x0000UL    /* Lower NVRAM portions */
#define MOSTEK_48T59_48T02    0x1800UL    /* Offset to 48T02 chip */

#endif /* !(_SPARC64_MOSTEK_H) */

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