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/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>
  22
  23
  24 static void
  25 rpx_iic_init(struct i2c_algo_8xx_data *data)
  26 {
  27         volatile cpm8xx_t *cp;
  28         volatile immap_t *immap;
  29
  30         cp = cpmp;      /* Get pointer to Communication Processor */
  31         immap = (immap_t *)IMAP_ADDR;   /* and to internal registers */
  32
  33         data->iip = (iic_t *)&cp->cp_dparam[PROFF_IIC];
  34
  35         /* Check for and use a microcode relocation patch.
  36         */
  37         if ((data->reloc = data->iip->iic_rpbase))
  38                 data->iip = (iic_t *)&cp->cp_dpmem[data->iip->iic_rpbase];
  39
  40         data->i2c = (i2c8xx_t *)&(immap->im_i2c);
  41         data->cp = cp;
  42
  43         /* Initialize Port B IIC pins.
  44         */
  45         cp->cp_pbpar |= 0x00000030;
  46         cp->cp_pbdir |= 0x00000030;
  47         cp->cp_pbodr |= 0x00000030;
  48
  49         /* Allocate space for two transmit and two receive buffer
  50          * descriptors in the DP ram.
  51          */
  52         data->dp_addr = cpm_dpalloc(sizeof(cbd_t) * 4, 8);
  53
  54         /* ptr to i2c area */
  55         data->i2c = (i2c8xx_t *)&(((immap_t *)IMAP_ADDR)->im_i2c);
  56 }
  57
  58 static int rpx_install_isr(int irq, void (*func)(void *), void *data)
  59 {
  60         /* install interrupt handler */
  61         cpm_install_handler(irq, func, data);
  62
  63         return 0;
  64 }
  65
  66 static struct i2c_algo_8xx_data rpx_data = {
  67         .setisr = rpx_install_isr
  68 };
  69
  70 static struct i2c_adapter rpx_ops = {
  71         .owner          = THIS_MODULE,
  72         .name           = "m8xx",
  73         .id             = I2C_HW_MPC8XX_EPON,
  74         .algo_data      = &rpx_data,
  75 };
  76
  77 int __init i2c_rpx_init(void)
  78 {
  79         printk(KERN_INFO "i2c-rpx: i2c MPC8xx driver\n");
  80
  81         /* reset hardware to sane state */
  82         rpx_iic_init(&rpx_data);
  83
  84         if (i2c_8xx_add_bus(&rpx_ops) < 0) {
  85                 printk(KERN_ERR "i2c-rpx: Unable to register with I2C\n");
  86                 return -ENODEV;
  87         }
  88
  89         return 0;
  90 }
  91
  92 void __exit i2c_rpx_exit(void)
  93 {
  94         i2c_8xx_del_bus(&rpx_ops);
  95 }
  96
  97 MODULE_AUTHOR("Dan Malek <dmalek@jlc.net>");
  98 MODULE_DESCRIPTION("I2C-Bus adapter routines for MPC8xx boards");
  99
 100 module_init(i2c_rpx_init);
 101 module_exit(i2c_rpx_exit);