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/*
 * Embedded Planet RPX Lite MPC8xx CPM I2C interface.
 * Copyright (c) 1999 Dan Malek (dmalek@jlc.net).
 *
 * moved into proper i2c interface;
 * Brad Parker (brad@heeltoe.com)
 *
 * RPX lite specific parts of the i2c interface
 * Update:  There actually isn't anything RPXLite-specific about this module.
 * This should work for most any 8xx board.  The console messages have been
 * changed to eliminate RPXLite references.
 */

#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/stddef.h>
#include <linux/parport.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-8xx.h>
#include <asm/mpc8xx.h>
#include <asm/commproc.h>


static void
rpx_iic_init(struct i2c_algo_8xx_data *data)
{
        volatile cpm8xx_t *cp;
        volatile immap_t *immap;

        cp = cpmp;      /* Get pointer to Communication Processor */
        immap = (immap_t *)IMAP_ADDR;   /* and to internal registers */

        data->iip = (iic_t *)&cp->cp_dparam[PROFF_IIC];

        /* Check for and use a microcode relocation patch.
        */
        if ((data->reloc = data->iip->iic_rpbase))
                data->iip = (iic_t *)&cp->cp_dpmem[data->iip->iic_rpbase];
               
        data->i2c = (i2c8xx_t *)&(immap->im_i2c);
        data->cp = cp;

        /* Initialize Port B IIC pins.
        */
        cp->cp_pbpar |= 0x00000030;
        cp->cp_pbdir |= 0x00000030;
        cp->cp_pbodr |= 0x00000030;

        /* Allocate space for two transmit and two receive buffer
         * descriptors in the DP ram.
         */
        data->dp_addr = m8xx_cpm_dpalloc(sizeof(cbd_t) * 4);

        /* ptr to i2c area */
        data->i2c = (i2c8xx_t *)&(((immap_t *)IMAP_ADDR)->im_i2c);
}

static int rpx_install_isr(int irq, void (*func)(void *, void *), void *data)
{
        /* install interrupt handler */
        cpm_install_handler(irq, (void (*)(void *, struct pt_regs *)) func, data);

        return 0;
}

static struct i2c_algo_8xx_data rpx_data = {
        .setisr = rpx_install_isr
};

static struct i2c_adapter rpx_ops = {
        .owner          = THIS_MODULE,
        .name           = "m8xx",
        .id             = I2C_HW_MPC8XX_EPON,
        .algo_data      = &rpx_data,
};

int __init i2c_rpx_init(void)
{
        printk(KERN_INFO "i2c-rpx: i2c MPC8xx driver\n");

        /* reset hardware to sane state */
        rpx_iic_init(&rpx_data);

        if (i2c_8xx_add_bus(&rpx_ops) < 0) {
                printk("i2c-rpx: Unable to register with I2C\n");
                return -ENODEV;
        }

        return 0;
}

void __exit i2c_rpx_exit(void)
{
        i2c_8xx_del_bus(&rpx_ops);
}

MODULE_AUTHOR("Dan Malek <dmalek@jlc.net>");
MODULE_DESCRIPTION("I2C-Bus adapter routines for MPC8xx boards");

module_init(i2c_rpx_init);
module_exit(i2c_rpx_exit);