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420 giacomo 1
/*
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 * Embedded Planet RPX Lite MPC8xx CPM I2C interface.
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 * Copyright (c) 1999 Dan Malek (dmalek@jlc.net).
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 *
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 * moved into proper i2c interface;
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 * Brad Parker (brad@heeltoe.com)
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 *
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 * RPX lite specific parts of the i2c interface
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 * Update:  There actually isn't anything RPXLite-specific about this module.
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 * This should work for most any 8xx board.  The console messages have been
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 * changed to eliminate RPXLite references.
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 */
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#include <linux/kernel.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/stddef.h>
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#include <linux/parport.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-8xx.h>
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#include <asm/mpc8xx.h>
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#include <asm/commproc.h>
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static void
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rpx_iic_init(struct i2c_algo_8xx_data *data)
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{
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        volatile cpm8xx_t *cp;
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        volatile immap_t *immap;
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        cp = cpmp;      /* Get pointer to Communication Processor */
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        immap = (immap_t *)IMAP_ADDR;   /* and to internal registers */
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        data->iip = (iic_t *)&cp->cp_dparam[PROFF_IIC];
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        /* Check for and use a microcode relocation patch.
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        */
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        if ((data->reloc = data->iip->iic_rpbase))
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                data->iip = (iic_t *)&cp->cp_dpmem[data->iip->iic_rpbase];
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        data->i2c = (i2c8xx_t *)&(immap->im_i2c);
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        data->cp = cp;
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        /* Initialize Port B IIC pins.
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        */
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        cp->cp_pbpar |= 0x00000030;
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        cp->cp_pbdir |= 0x00000030;
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        cp->cp_pbodr |= 0x00000030;
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        /* Allocate space for two transmit and two receive buffer
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         * descriptors in the DP ram.
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         */
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        data->dp_addr = m8xx_cpm_dpalloc(sizeof(cbd_t) * 4);
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        /* ptr to i2c area */
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        data->i2c = (i2c8xx_t *)&(((immap_t *)IMAP_ADDR)->im_i2c);
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}
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static int rpx_install_isr(int irq, void (*func)(void *, void *), void *data)
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{
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        /* install interrupt handler */
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        cpm_install_handler(irq, (void (*)(void *, struct pt_regs *)) func, data);
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        return 0;
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}
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static struct i2c_algo_8xx_data rpx_data = {
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        .setisr = rpx_install_isr
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};
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static struct i2c_adapter rpx_ops = {
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        .owner          = THIS_MODULE,
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        .name           = "m8xx",
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        .id             = I2C_HW_MPC8XX_EPON,
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        .algo_data      = &rpx_data,
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};
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int __init i2c_rpx_init(void)
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{
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        printk(KERN_INFO "i2c-rpx: i2c MPC8xx driver\n");
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        /* reset hardware to sane state */
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        rpx_iic_init(&rpx_data);
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        if (i2c_8xx_add_bus(&rpx_ops) < 0) {
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                printk("i2c-rpx: Unable to register with I2C\n");
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                return -ENODEV;
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        }
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        return 0;
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}
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void __exit i2c_rpx_exit(void)
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{
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        i2c_8xx_del_bus(&rpx_ops);
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}
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MODULE_AUTHOR("Dan Malek <dmalek@jlc.net>");
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MODULE_DESCRIPTION("I2C-Bus adapter routines for MPC8xx boards");
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module_init(i2c_rpx_init);
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module_exit(i2c_rpx_exit);