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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* |
| 2 | * Architecture dependent definitions |
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| 3 | * for NEC uPD4990A serial I/O real-time clock. |
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| 4 | * |
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| 5 | * Copyright 2001 TAKAI Kousuke <tak@kmc.kyoto-u.ac.jp> |
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| 6 | * Kyoto University Microcomputer Club (KMC). |
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| 7 | * |
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| 8 | * References: |
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| 9 | * uPD4990A serial I/O real-time clock users' manual (Japanese) |
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| 10 | * No. S12828JJ4V0UM00 (4th revision), NEC Corporation, 1999. |
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| 11 | */ |
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| 12 | |||
| 13 | #ifndef _ASM_I386_uPD4990A_H |
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| 14 | #define _ASM_I386_uPD4990A_H |
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| 15 | |||
| 16 | #include <asm/io.h> |
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| 17 | |||
| 18 | #define UPD4990A_IO (0x0020) |
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| 19 | #define UPD4990A_IO_DATAOUT (0x0033) |
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| 20 | |||
| 21 | #define UPD4990A_OUTPUT_DATA_CLK(data, clk) \ |
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| 22 | outb((((data) & 1) << 5) | (((clk) & 1) << 4) \ |
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| 23 | | UPD4990A_PAR_SERIAL_MODE, UPD4990A_IO) |
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| 24 | |||
| 25 | #define UPD4990A_OUTPUT_CLK(clk) UPD4990A_OUTPUT_DATA_CLK(0, (clk)) |
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| 26 | |||
| 27 | #define UPD4990A_OUTPUT_STROBE(stb) \ |
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| 28 | outb(((stb) << 3) | UPD4990A_PAR_SERIAL_MODE, UPD4990A_IO) |
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| 29 | |||
| 30 | /* |
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| 31 | * Note: udelay() is *not* usable for UPD4990A_DELAY because |
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| 32 | * the Linux kernel reads uPD4990A to set up system clock |
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| 33 | * before calibrating delay... |
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| 34 | */ |
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| 35 | #define UPD4990A_DELAY(usec) \ |
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| 36 | do { \ |
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| 37 | if (__builtin_constant_p((usec)) && (usec) < 5) \ |
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| 38 | __asm__ (".rept %c1\n\toutb %%al,%0\n\t.endr" \ |
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| 39 | : : "N" (0x5F), \ |
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| 40 | "i" (((usec) * 10 + 5) / 6)); \ |
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| 41 | else { \ |
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| 42 | int _count = ((usec) * 10 + 5) / 6; \ |
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| 43 | __asm__ volatile ("1: outb %%al,%1\n\tloop 1b" \ |
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| 44 | : "=c" (_count) \ |
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| 45 | : "N" (0x5F), "0" (_count)); \ |
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| 46 | } \ |
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| 47 | } while (0) |
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| 48 | |||
| 49 | /* Caller should ignore all bits except bit0 */ |
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| 50 | #define UPD4990A_READ_DATA() inb(UPD4990A_IO_DATAOUT) |
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| 51 | |||
| 52 | #endif |