/drivers/i2c/busses/i2c-rpx.c

  1/*
  2 * Embedded Planet RPX Lite MPC8xx CPM I2C interface.
  3 * Copyright (c) 1999 Dan Malek (dmalek@jlc.net).
  4 *
  5 * moved into proper i2c interface;
  6 * Brad Parker (brad@heeltoe.com)
  7 *
  8 * RPX lite specific parts of the i2c interface
  9 * Update:  There actually isn't anything RPXLite-specific about this module.
 10 * This should work for most any 8xx board.  The console messages have been 
 11 * changed to eliminate RPXLite references.
 12 */
 13
 14#include <linux/config.h>
 15#include <linux/kernel.h>
 16#include <linux/module.h>
 17#include <linux/init.h>
 18#include <linux/stddef.h>
 19#include <linux/i2c.h>
 20#include <linux/i2c-algo-8xx.h>
 21#include <asm/mpc8xx.h>
 22#include <asm/commproc.h>
 23
 24
 25static void
 26rpx_iic_init(struct i2c_algo_8xx_data *data)
 27{
 28	volatile cpm8xx_t *cp;
 29	volatile immap_t *immap;
 30
 31	cp = cpmp;	/* Get pointer to Communication Processor */
 32	immap = (immap_t *)IMAP_ADDR;	/* and to internal registers */
 33
 34	data->iip = (iic_t *)&cp->cp_dparam[PROFF_IIC];
 35
 36	/* Check for and use a microcode relocation patch.
 37	*/
 38	if ((data->reloc = data->iip->iic_rpbase))
 39		data->iip = (iic_t *)&cp->cp_dpmem[data->iip->iic_rpbase];
 40		
 41	data->i2c = (i2c8xx_t *)&(immap->im_i2c);
 42	data->cp = cp;
 43
 44	/* Initialize Port B IIC pins.
 45	*/
 46	cp->cp_pbpar |= 0x00000030;
 47	cp->cp_pbdir |= 0x00000030;
 48	cp->cp_pbodr |= 0x00000030;
 49
 50	/* Allocate space for two transmit and two receive buffer
 51	 * descriptors in the DP ram.
 52	 */
 53	data->dp_addr = cpm_dpalloc(sizeof(cbd_t) * 4, 8);
 54		
 55	/* ptr to i2c area */
 56	data->i2c = (i2c8xx_t *)&(((immap_t *)IMAP_ADDR)->im_i2c);
 57}
 58
 59static int rpx_install_isr(int irq, void (*func)(void *, void *), void *data)
 60{
 61	/* install interrupt handler */
 62	cpm_install_handler(irq, (void (*)(void *, struct pt_regs *)) func, data);
 63
 64	return 0;
 65}
 66
 67static struct i2c_algo_8xx_data rpx_data = {
 68	.setisr = rpx_install_isr
 69};
 70
 71static struct i2c_adapter rpx_ops = {
 72	.owner		= THIS_MODULE,
 73	.name		= "m8xx",
 74	.id		= I2C_HW_MPC8XX_EPON,
 75	.algo_data	= &rpx_data,
 76};
 77
 78int __init i2c_rpx_init(void)
 79{
 80	printk(KERN_INFO "i2c-rpx: i2c MPC8xx driver\n");
 81
 82	/* reset hardware to sane state */
 83	rpx_iic_init(&rpx_data);
 84
 85	if (i2c_8xx_add_bus(&rpx_ops) < 0) {
 86		printk(KERN_ERR "i2c-rpx: Unable to register with I2C\n");
 87		return -ENODEV;
 88	}
 89
 90	return 0;
 91}
 92
 93void __exit i2c_rpx_exit(void)
 94{
 95	i2c_8xx_del_bus(&rpx_ops);
 96}
 97
 98MODULE_AUTHOR("Dan Malek <dmalek@jlc.net>");
 99MODULE_DESCRIPTION("I2C-Bus adapter routines for MPC8xx boards");
100
101module_init(i2c_rpx_init);
102module_exit(i2c_rpx_exit);