patch-2.3.99-pre9 linux/arch/arm/kernel/iic.c

• Lines: 249
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.99-pre8/linux/arch/arm/kernel/iic.c
• Orig date: Thu Jun 17 01:11:35 1999

diff -u --recursive --new-file v2.3.99-pre8/linux/arch/arm/kernel/iic.c linux/arch/arm/kernel/iic.c
@@ -1,248 +0,0 @@
-/*
- * linux/arch/arm/kernel/iic.c
- *
- * Copyright (C) 1995, 1996 Russell King
- *
- * IIC is used to get the current time from the CMOS rtc.
- */
-
-#include <linux/delay.h>
-#include <linux/errno.h>
-
-#include <asm/system.h>
-#include <asm/hardware.h>
-#include <asm/io.h>
-#include <asm/ioc.h>
-
-#define FORCE_ONES	0xdc
-
-/*
- * if delay loop has been calibrated then us that,
- * else use IOC timer 1.
- */
-static void iic_delay(void)
-{
-	extern unsigned long loops_per_sec;
-	if (loops_per_sec != (1 << 12)) {
-		udelay(100); /* was 10 */
-		return;
-	} else {
-		unsigned long flags;
-		save_flags_cli(flags);
-
-		outb(254,  IOC_T1LTCHL);
-		outb(255,  IOC_T1LTCHH);
-		outb(0,    IOC_T1GO);
-		outb(1<<6, IOC_IRQCLRA);			/* clear T1 irq */
-		outb(10,   IOC_T1LTCHL); /* was 4 */
-		outb(0,    IOC_T1LTCHH);
-		outb(0,    IOC_T1GO);
-		while ((inb(IOC_IRQSTATA) & (1<<6)) == 0);
-		restore_flags(flags);
-	}
-}
-
-#define IIC_INIT()		dat = (inb(IOC_CONTROL) | FORCE_ONES) & ~3
-#define IIC_SET_DAT		outb(dat|=1, IOC_CONTROL);
-#define IIC_CLR_DAT		outb(dat&=~1, IOC_CONTROL);
-#define IIC_SET_CLK		outb(dat|=2, IOC_CONTROL);
-#define IIC_CLR_CLK		outb(dat&=~2, IOC_CONTROL);
-#define IIC_DELAY		iic_delay();
-#define IIC_READ_DATA()		(inb(IOC_CONTROL) & 1)
-
-static inline void iic_set_lines(int clk, int dat)
-{
-	int old;
-
-	old = inb(IOC_CONTROL) | FORCE_ONES;
-
-	old &= ~3;
-
-	if (clk)
-		old |= 2;
-	if (dat)
-		old |= 1;
-
-	outb(old, IOC_CONTROL);
-
-	iic_delay();
-}
-
-static inline unsigned int iic_read_data(void)
-{
-	return inb(IOC_CONTROL) & 1;
-}
-
-/*
- * C: ==~~_
- * D: =~~__
- */
-static inline void iic_start(void)
-{
-	unsigned int dat;
-
-	IIC_INIT();
-
-	IIC_SET_DAT
-	IIC_DELAY
-	IIC_SET_CLK
-	IIC_DELAY
-
-	IIC_CLR_DAT
-	IIC_DELAY
-	IIC_CLR_CLK
-	IIC_DELAY
-}
-
-/*
- * C: __~~
- * D: =__~
- */
-static inline void iic_stop(void)
-{
-	unsigned int dat;
-
-	IIC_INIT();
-
-	IIC_CLR_DAT
-	IIC_DELAY
-	IIC_SET_CLK
-	IIC_DELAY
-	IIC_SET_DAT
-	IIC_DELAY
-}
-
-/*
- * C: __~_
- * D: =___
- */
-static inline void iic_acknowledge(void)
-{
-	unsigned int dat;
-
-	IIC_INIT();
-
-	IIC_CLR_DAT
-	IIC_DELAY
-	IIC_SET_CLK
-	IIC_DELAY
-	IIC_CLR_CLK
-	IIC_DELAY
-}
-
-/*
- * C: __~_
- * D: =~H~
- */
-static inline int iic_is_acknowledged(void)
-{
-	unsigned int dat, ack_bit;
-
-	IIC_INIT();
-
-	IIC_SET_DAT
-	IIC_DELAY
-	IIC_SET_CLK
-	IIC_DELAY
-
-	ack_bit = IIC_READ_DATA();
-
-	IIC_CLR_CLK
-	IIC_DELAY
-
-	return ack_bit == 0;
-}
-
-/*
- * C: _~__~__~__~__~__~__~__~_
- * D: =DDXDDXDDXDDXDDXDDXDDXDD
- */
-static void iic_sendbyte(unsigned int b)
-{
-	unsigned int dat, i;
-
-	IIC_INIT();
-
-	for (i = 0; i < 8; i++) {
-		if (b & 128)
-			IIC_SET_DAT
-		else
-			IIC_CLR_DAT
-		IIC_DELAY
-
-		IIC_SET_CLK
-		IIC_DELAY
-		IIC_CLR_CLK
-		IIC_DELAY
-
-		b <<= 1;
-	}
-}
-
-/*
- * C: __~_~_~_~_~_~_~_~_
- * D: =~HHHHHHHHHHHHHHHH
- */
-static unsigned char iic_recvbyte(void)
-{
-	unsigned int dat, i, in;
-
-	IIC_INIT();
-
-	IIC_SET_DAT
-	IIC_DELAY
-
-	in = 0;
-	for (i = 0; i < 8; i++) {
-		IIC_SET_CLK
-		IIC_DELAY
-
-		in = (in << 1) | IIC_READ_DATA();
-
-		IIC_CLR_CLK
-		IIC_DELAY
-	}
-
-	return in;
-}
-
-int iic_control (unsigned char addr, unsigned char loc, unsigned char *buf, int len)
-{
-	int i, err = -EIO;
-
-	iic_start();
-	iic_sendbyte(addr & 0xfe);
-	if (!iic_is_acknowledged())
-		goto error;
-
-	iic_sendbyte(loc);
-	if (!iic_is_acknowledged())
-		goto error;
-
-	if (addr & 1) {
-		iic_stop();
-		iic_start();
-		iic_sendbyte(addr|1);
-		if (!iic_is_acknowledged())
-			goto error;
-
-		for (i = 0; i < len - 1; i++) {
-			buf[i] = iic_recvbyte();
-			iic_acknowledge();
-		}
-		buf[i] = iic_recvbyte();
-	} else {
-		for (i = 0; i < len; i++) {
-			iic_sendbyte(buf[i]);
-
-			if (!iic_is_acknowledged())
-				goto error;
-		}
-	}
-
-	err = 0;
-error:
-	iic_stop();
-
-	return err;
-}