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
  25 static void
  26 rpx_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
  59 static 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
  67 static struct i2c_algo_8xx_data rpx_data = {
  68         .setisr = rpx_install_isr
  69 };
  70
  71 static 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
  78 int __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
  93 void __exit i2c_rpx_exit(void)
  94 {
  95         i2c_8xx_del_bus(&rpx_ops);
  96 }
  97
  98 MODULE_AUTHOR("Dan Malek <dmalek@jlc.net>");
  99 MODULE_DESCRIPTION("I2C-Bus adapter routines for MPC8xx boards");
 100
 101 module_init(i2c_rpx_init);
 102 module_exit(i2c_rpx_exit);