linux-imx

/* bbc_i2c.c: I2C low-level driver for BBC device on UltraSPARC-III

 *            platforms.

 *

 * Copyright (C) 2001, 2008 David S. Miller (davem@davemloft.net)

 */

​

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/types.h>

#include <linux/slab.h>

#include <linux/sched.h>

#include <linux/wait.h>

#include <linux/delay.h>

#include <linux/interrupt.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <asm/bbc.h>

#include <asm/io.h>

​

#include "bbc_i2c.h"

​

/* Convert this driver to use i2c bus layer someday... */

#define I2C_PCF_PIN 0x80

#define I2C_PCF_ESO 0x40

#define I2C_PCF_ES1 0x20

#define I2C_PCF_ES2 0x10

#define I2C_PCF_ENI 0x08

#define I2C_PCF_STA 0x04

#define I2C_PCF_STO 0x02

#define I2C_PCF_ACK 0x01

​

#define I2C_PCF_START    (I2C_PCF_PIN | I2C_PCF_ESO | I2C_PCF_ENI | I2C_PCF_STA | I2C_PCF_ACK)

#define I2C_PCF_STOP     (I2C_PCF_PIN | I2C_PCF_ESO | I2C_PCF_STO | I2C_PCF_ACK)

#define I2C_PCF_REPSTART (              I2C_PCF_ESO | I2C_PCF_STA | I2C_PCF_ACK)

#define I2C_PCF_IDLE     (I2C_PCF_PIN | I2C_PCF_ESO               | I2C_PCF_ACK)

​

#define I2C_PCF_INI 0x40   /* 1 if not initialized */

#define I2C_PCF_STS 0x20

#define I2C_PCF_BER 0x10

#define I2C_PCF_AD0 0x08

#define I2C_PCF_LRB 0x08

#define I2C_PCF_AAS 0x04

#define I2C_PCF_LAB 0x02

#define I2C_PCF_BB  0x01

​

/* The BBC devices have two I2C controllers.  The first I2C controller

 * connects mainly to configuration proms (NVRAM, cpu configuration,

 * dimm types, etc.).  Whereas the second I2C controller connects to

 * environmental control devices such as fans and temperature sensors.

 * The second controller also connects to the smartcard reader, if present.

 */

​

static void set_device_claimage(struct bbc_i2c_bus *bp, struct platform_device *op, int val)

{

    int i;

​

    for (i = 0; i < NUM_CHILDREN; i++) {

        if (bp->devs[i].device == op) {

            bp->devs[i].client_claimed = val;

            return;

        }

    }

}

​

#define claim_device(BP,ECHILD)     set_device_claimage(BP,ECHILD,1)

#define release_device(BP,ECHILD)   set_device_claimage(BP,ECHILD,0)

​

struct platform_device *bbc_i2c_getdev(struct bbc_i2c_bus *bp, int index)

{

    struct platform_device *op = NULL;

    int curidx = 0, i;

​

    for (i = 0; i < NUM_CHILDREN; i++) {

        if (!(op = bp->devs[i].device))

            break;

        if (curidx == index)

            goto out;

        op = NULL;

        curidx++;

    }

​

out:

    if (curidx == index)

        return op;

    return NULL;

}

​

struct bbc_i2c_client *bbc_i2c_attach(struct bbc_i2c_bus *bp, struct platform_device *op)

{

    struct bbc_i2c_client *client;

    const u32 *reg;

​