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102 lines
2.4 KiB
102 lines
2.4 KiB
20 years ago
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/*
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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/module.h>
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#include <linux/init.h>
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#include <linux/stddef.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 = cpm_dpalloc(sizeof(cbd_t) * 4, 8);
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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(KERN_ERR "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);
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