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-rw-r--r--include/asm-sparc/mostek_64.h143
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diff --git a/include/asm-sparc/mostek_64.h b/include/asm-sparc/mostek_64.h
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1/* mostek.h: Describes the various Mostek time of day clock registers.
2 *
3 * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
5 */
6
7#ifndef _SPARC64_MOSTEK_H
8#define _SPARC64_MOSTEK_H
9
10#include <asm/idprom.h>
11
12/* M48T02 Register Map (adapted from Sun NVRAM/Hostid FAQ)
13 *
14 * Data
15 * Address Function
16 * Bit 7 Bit 6 Bit 5 Bit 4Bit 3 Bit 2 Bit 1 Bit 0
17 * 7ff - - - - - - - - Year 00-99
18 * 7fe 0 0 0 - - - - - Month 01-12
19 * 7fd 0 0 - - - - - - Date 01-31
20 * 7fc 0 FT 0 0 0 - - - Day 01-07
21 * 7fb KS 0 - - - - - - Hours 00-23
22 * 7fa 0 - - - - - - - Minutes 00-59
23 * 7f9 ST - - - - - - - Seconds 00-59
24 * 7f8 W R S - - - - - Control
25 *
26 * * ST is STOP BIT
27 * * W is WRITE BIT
28 * * R is READ BIT
29 * * S is SIGN BIT
30 * * FT is FREQ TEST BIT
31 * * KS is KICK START BIT
32 */
33
34/* The Mostek 48t02 real time clock and NVRAM chip. The registers
35 * other than the control register are in binary coded decimal. Some
36 * control bits also live outside the control register.
37 *
38 * We now deal with physical addresses for I/O to the chip. -DaveM
39 */
40static inline u8 mostek_read(void __iomem *addr)
41{
42 u8 ret;
43
44 __asm__ __volatile__("lduba [%1] %2, %0"
45 : "=r" (ret)
46 : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E));
47 return ret;
48}
49
50static inline void mostek_write(void __iomem *addr, u8 val)
51{
52 __asm__ __volatile__("stba %0, [%1] %2"
53 : /* no outputs */
54 : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E));
55}
56
57#define MOSTEK_EEPROM 0x0000UL
58#define MOSTEK_IDPROM 0x07d8UL
59#define MOSTEK_CREG 0x07f8UL
60#define MOSTEK_SEC 0x07f9UL
61#define MOSTEK_MIN 0x07faUL
62#define MOSTEK_HOUR 0x07fbUL
63#define MOSTEK_DOW 0x07fcUL
64#define MOSTEK_DOM 0x07fdUL
65#define MOSTEK_MONTH 0x07feUL
66#define MOSTEK_YEAR 0x07ffUL
67
68extern spinlock_t mostek_lock;
69extern void __iomem *mstk48t02_regs;
70
71/* Control register values. */
72#define MSTK_CREG_WRITE 0x80 /* Must set this before placing values. */
73#define MSTK_CREG_READ 0x40 /* Stop updates to allow a clean read. */
74#define MSTK_CREG_SIGN 0x20 /* Slow/speed clock in calibration mode. */
75
76/* Control bits that live in the other registers. */
77#define MSTK_STOP 0x80 /* Stop the clock oscillator. (sec) */
78#define MSTK_KICK_START 0x80 /* Kick start the clock chip. (hour) */
79#define MSTK_FREQ_TEST 0x40 /* Frequency test mode. (day) */
80
81#define MSTK_YEAR_ZERO 1968 /* If year reg has zero, it is 1968. */
82#define MSTK_CVT_YEAR(yr) ((yr) + MSTK_YEAR_ZERO)
83
84/* Masks that define how much space each value takes up. */
85#define MSTK_SEC_MASK 0x7f
86#define MSTK_MIN_MASK 0x7f
87#define MSTK_HOUR_MASK 0x3f
88#define MSTK_DOW_MASK 0x07
89#define MSTK_DOM_MASK 0x3f
90#define MSTK_MONTH_MASK 0x1f
91#define MSTK_YEAR_MASK 0xffU
92
93/* Binary coded decimal conversion macros. */
94#define MSTK_REGVAL_TO_DECIMAL(x) (((x) & 0x0F) + 0x0A * ((x) >> 0x04))
95#define MSTK_DECIMAL_TO_REGVAL(x) ((((x) / 0x0A) << 0x04) + ((x) % 0x0A))
96
97/* Generic register set and get macros for internal use. */
98#define MSTK_GET(regs,name) \
99 (MSTK_REGVAL_TO_DECIMAL(mostek_read(regs + MOSTEK_ ## name) & MSTK_ ## name ## _MASK))
100#define MSTK_SET(regs,name,value) \
101do { u8 __val = mostek_read(regs + MOSTEK_ ## name); \
102 __val &= ~(MSTK_ ## name ## _MASK); \
103 __val |= (MSTK_DECIMAL_TO_REGVAL(value) & \
104 (MSTK_ ## name ## _MASK)); \
105 mostek_write(regs + MOSTEK_ ## name, __val); \
106} while(0)
107
108/* Macros to make register access easier on our fingers. These give you
109 * the decimal value of the register requested if applicable. You pass
110 * the a pointer to a 'struct mostek48t02'.
111 */
112#define MSTK_REG_CREG(regs) (mostek_read((regs) + MOSTEK_CREG))
113#define MSTK_REG_SEC(regs) MSTK_GET(regs,SEC)
114#define MSTK_REG_MIN(regs) MSTK_GET(regs,MIN)
115#define MSTK_REG_HOUR(regs) MSTK_GET(regs,HOUR)
116#define MSTK_REG_DOW(regs) MSTK_GET(regs,DOW)
117#define MSTK_REG_DOM(regs) MSTK_GET(regs,DOM)
118#define MSTK_REG_MONTH(regs) MSTK_GET(regs,MONTH)
119#define MSTK_REG_YEAR(regs) MSTK_GET(regs,YEAR)
120
121#define MSTK_SET_REG_SEC(regs,value) MSTK_SET(regs,SEC,value)
122#define MSTK_SET_REG_MIN(regs,value) MSTK_SET(regs,MIN,value)
123#define MSTK_SET_REG_HOUR(regs,value) MSTK_SET(regs,HOUR,value)
124#define MSTK_SET_REG_DOW(regs,value) MSTK_SET(regs,DOW,value)
125#define MSTK_SET_REG_DOM(regs,value) MSTK_SET(regs,DOM,value)
126#define MSTK_SET_REG_MONTH(regs,value) MSTK_SET(regs,MONTH,value)
127#define MSTK_SET_REG_YEAR(regs,value) MSTK_SET(regs,YEAR,value)
128
129
130/* The Mostek 48t08 clock chip. Found on Sun4m's I think. It has the
131 * same (basically) layout of the 48t02 chip except for the extra
132 * NVRAM on board (8 KB against the 48t02's 2 KB).
133 */
134#define MOSTEK_48T08_OFFSET 0x0000UL /* Lower NVRAM portions */
135#define MOSTEK_48T08_48T02 0x1800UL /* Offset to 48T02 chip */
136
137/* SUN5 systems usually have 48t59 model clock chipsets. But we keep the older
138 * clock chip definitions around just in case.
139 */
140#define MOSTEK_48T59_OFFSET 0x0000UL /* Lower NVRAM portions */
141#define MOSTEK_48T59_48T02 0x1800UL /* Offset to 48T02 chip */
142
143#endif /* !(_SPARC64_MOSTEK_H) */
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