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144 lines
5.3 KiB
C
144 lines
5.3 KiB
C
/* mostek.h: Describes the various Mostek time of day clock registers.
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*
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* Copyright (C) 1995 David S. Miller (davem@davemloft.net)
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* Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
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*/
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#ifndef _SPARC64_MOSTEK_H
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#define _SPARC64_MOSTEK_H
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#include <asm/idprom.h>
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/* M48T02 Register Map (adapted from Sun NVRAM/Hostid FAQ)
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*
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* Data
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* Address Function
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* Bit 7 Bit 6 Bit 5 Bit 4Bit 3 Bit 2 Bit 1 Bit 0
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* 7ff - - - - - - - - Year 00-99
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* 7fe 0 0 0 - - - - - Month 01-12
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* 7fd 0 0 - - - - - - Date 01-31
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* 7fc 0 FT 0 0 0 - - - Day 01-07
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* 7fb KS 0 - - - - - - Hours 00-23
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* 7fa 0 - - - - - - - Minutes 00-59
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* 7f9 ST - - - - - - - Seconds 00-59
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* 7f8 W R S - - - - - Control
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*
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* * ST is STOP BIT
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* * W is WRITE BIT
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* * R is READ BIT
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* * S is SIGN BIT
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* * FT is FREQ TEST BIT
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* * KS is KICK START BIT
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*/
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/* The Mostek 48t02 real time clock and NVRAM chip. The registers
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* other than the control register are in binary coded decimal. Some
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* control bits also live outside the control register.
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*
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* We now deal with physical addresses for I/O to the chip. -DaveM
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*/
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static inline u8 mostek_read(void __iomem *addr)
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{
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u8 ret;
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__asm__ __volatile__("lduba [%1] %2, %0"
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: "=r" (ret)
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: "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E));
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return ret;
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}
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static inline void mostek_write(void __iomem *addr, u8 val)
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{
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__asm__ __volatile__("stba %0, [%1] %2"
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: /* no outputs */
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: "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E));
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}
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#define MOSTEK_EEPROM 0x0000UL
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#define MOSTEK_IDPROM 0x07d8UL
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#define MOSTEK_CREG 0x07f8UL
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#define MOSTEK_SEC 0x07f9UL
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#define MOSTEK_MIN 0x07faUL
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#define MOSTEK_HOUR 0x07fbUL
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#define MOSTEK_DOW 0x07fcUL
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#define MOSTEK_DOM 0x07fdUL
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#define MOSTEK_MONTH 0x07feUL
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#define MOSTEK_YEAR 0x07ffUL
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extern spinlock_t mostek_lock;
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extern void __iomem *mstk48t02_regs;
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/* Control register values. */
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#define MSTK_CREG_WRITE 0x80 /* Must set this before placing values. */
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#define MSTK_CREG_READ 0x40 /* Stop updates to allow a clean read. */
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#define MSTK_CREG_SIGN 0x20 /* Slow/speed clock in calibration mode. */
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/* Control bits that live in the other registers. */
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#define MSTK_STOP 0x80 /* Stop the clock oscillator. (sec) */
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#define MSTK_KICK_START 0x80 /* Kick start the clock chip. (hour) */
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#define MSTK_FREQ_TEST 0x40 /* Frequency test mode. (day) */
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#define MSTK_YEAR_ZERO 1968 /* If year reg has zero, it is 1968. */
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#define MSTK_CVT_YEAR(yr) ((yr) + MSTK_YEAR_ZERO)
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/* Masks that define how much space each value takes up. */
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#define MSTK_SEC_MASK 0x7f
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#define MSTK_MIN_MASK 0x7f
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#define MSTK_HOUR_MASK 0x3f
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#define MSTK_DOW_MASK 0x07
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#define MSTK_DOM_MASK 0x3f
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#define MSTK_MONTH_MASK 0x1f
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#define MSTK_YEAR_MASK 0xffU
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/* Binary coded decimal conversion macros. */
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#define MSTK_REGVAL_TO_DECIMAL(x) (((x) & 0x0F) + 0x0A * ((x) >> 0x04))
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#define MSTK_DECIMAL_TO_REGVAL(x) ((((x) / 0x0A) << 0x04) + ((x) % 0x0A))
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/* Generic register set and get macros for internal use. */
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#define MSTK_GET(regs,name) \
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(MSTK_REGVAL_TO_DECIMAL(mostek_read(regs + MOSTEK_ ## name) & MSTK_ ## name ## _MASK))
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#define MSTK_SET(regs,name,value) \
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do { u8 __val = mostek_read(regs + MOSTEK_ ## name); \
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__val &= ~(MSTK_ ## name ## _MASK); \
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__val |= (MSTK_DECIMAL_TO_REGVAL(value) & \
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(MSTK_ ## name ## _MASK)); \
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mostek_write(regs + MOSTEK_ ## name, __val); \
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} while(0)
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/* Macros to make register access easier on our fingers. These give you
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* the decimal value of the register requested if applicable. You pass
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* the a pointer to a 'struct mostek48t02'.
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*/
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#define MSTK_REG_CREG(regs) (mostek_read((regs) + MOSTEK_CREG))
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#define MSTK_REG_SEC(regs) MSTK_GET(regs,SEC)
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#define MSTK_REG_MIN(regs) MSTK_GET(regs,MIN)
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#define MSTK_REG_HOUR(regs) MSTK_GET(regs,HOUR)
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#define MSTK_REG_DOW(regs) MSTK_GET(regs,DOW)
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#define MSTK_REG_DOM(regs) MSTK_GET(regs,DOM)
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#define MSTK_REG_MONTH(regs) MSTK_GET(regs,MONTH)
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#define MSTK_REG_YEAR(regs) MSTK_GET(regs,YEAR)
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#define MSTK_SET_REG_SEC(regs,value) MSTK_SET(regs,SEC,value)
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#define MSTK_SET_REG_MIN(regs,value) MSTK_SET(regs,MIN,value)
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#define MSTK_SET_REG_HOUR(regs,value) MSTK_SET(regs,HOUR,value)
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#define MSTK_SET_REG_DOW(regs,value) MSTK_SET(regs,DOW,value)
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#define MSTK_SET_REG_DOM(regs,value) MSTK_SET(regs,DOM,value)
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#define MSTK_SET_REG_MONTH(regs,value) MSTK_SET(regs,MONTH,value)
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#define MSTK_SET_REG_YEAR(regs,value) MSTK_SET(regs,YEAR,value)
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/* The Mostek 48t08 clock chip. Found on Sun4m's I think. It has the
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* same (basically) layout of the 48t02 chip except for the extra
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* NVRAM on board (8 KB against the 48t02's 2 KB).
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*/
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#define MOSTEK_48T08_OFFSET 0x0000UL /* Lower NVRAM portions */
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#define MOSTEK_48T08_48T02 0x1800UL /* Offset to 48T02 chip */
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/* SUN5 systems usually have 48t59 model clock chipsets. But we keep the older
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* clock chip definitions around just in case.
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*/
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#define MOSTEK_48T59_OFFSET 0x0000UL /* Lower NVRAM portions */
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#define MOSTEK_48T59_48T02 0x1800UL /* Offset to 48T02 chip */
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#endif /* !(_SPARC64_MOSTEK_H) */
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