2 * Embedded Planet RPX Lite MPC8xx CPM I2C interface.
3 * Copyright (c) 1999 Dan Malek (dmalek@jlc.net).
5 * moved into proper i2c interface;
6 * Brad Parker (brad@heeltoe.com)
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.
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/stddef.h>
18 #include <linux/i2c.h>
19 #include <linux/i2c-algo-8xx.h>
20 #include <asm/mpc8xx.h>
21 #include <asm/commproc.h>
25 rpx_iic_init(struct i2c_algo_8xx_data *data)
27 volatile cpm8xx_t *cp;
28 volatile immap_t *immap;
30 cp = cpmp; /* Get pointer to Communication Processor */
31 immap = (immap_t *)IMAP_ADDR; /* and to internal registers */
33 data->iip = (iic_t *)&cp->cp_dparam[PROFF_IIC];
35 /* Check for and use a microcode relocation patch.
37 if ((data->reloc = data->iip->iic_rpbase))
38 data->iip = (iic_t *)&cp->cp_dpmem[data->iip->iic_rpbase];
40 data->i2c = (i2c8xx_t *)&(immap->im_i2c);
43 /* Initialize Port B IIC pins.
45 cp->cp_pbpar |= 0x00000030;
46 cp->cp_pbdir |= 0x00000030;
47 cp->cp_pbodr |= 0x00000030;
49 /* Allocate space for two transmit and two receive buffer
50 * descriptors in the DP ram.
52 data->dp_addr = cpm_dpalloc(sizeof(cbd_t) * 4, 8);
55 data->i2c = (i2c8xx_t *)&(((immap_t *)IMAP_ADDR)->im_i2c);
58 static int rpx_install_isr(int irq, void (*func)(void *, void *), void *data)
60 /* install interrupt handler */
61 cpm_install_handler(irq, (void (*)(void *, struct pt_regs *)) func, data);
66 static struct i2c_algo_8xx_data rpx_data = {
67 .setisr = rpx_install_isr
70 static struct i2c_adapter rpx_ops = {
73 .id = I2C_HW_MPC8XX_EPON,
74 .algo_data = &rpx_data,
77 int __init i2c_rpx_init(void)
79 printk(KERN_INFO "i2c-rpx: i2c MPC8xx driver\n");
81 /* reset hardware to sane state */
82 rpx_iic_init(&rpx_data);
84 if (i2c_8xx_add_bus(&rpx_ops) < 0) {
85 printk(KERN_ERR "i2c-rpx: Unable to register with I2C\n");
92 void __exit i2c_rpx_exit(void)
94 i2c_8xx_del_bus(&rpx_ops);
97 MODULE_AUTHOR("Dan Malek <dmalek@jlc.net>");
98 MODULE_DESCRIPTION("I2C-Bus adapter routines for MPC8xx boards");
100 module_init(i2c_rpx_init);
101 module_exit(i2c_rpx_exit);