arch/powerpc/platforms/pasemi/misc.c

   1 /*
   2  * Copyright (C) 2007 PA Semi, Inc
   3  *
   4  * Parts based on arch/powerpc/sysdev/fsl_soc.c:
   5  *
   6  * 2006 (c) MontaVista Software, Inc.
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/errno.h>
  15 #include <linux/kernel.h>
  16 #include <linux/pci.h>
  17 #include <linux/of.h>
  18 #include <linux/i2c.h>
  19
  20 #ifdef CONFIG_I2C_BOARDINFO
  21 /* The below is from fsl_soc.c.  It's copied because since there are no
  22  * official bus bindings at this time it doesn't make sense to share across
  23  * the platforms, even though they happen to be common.
  24  */
  25 struct i2c_driver_device {
  26         char    *of_device;
  27         char    *i2c_type;
  28 };
  29
  30 static struct i2c_driver_device i2c_devices[] __initdata = {
  31         {"dallas,ds1338",  "ds1338"},
  32 };
  33
  34 static int __init find_i2c_driver(struct device_node *node,
  35                                      struct i2c_board_info *info)
  36 {
  37         int i;
  38
  39         for (i = 0; i < ARRAY_SIZE(i2c_devices); i++) {
  40                 if (!of_device_is_compatible(node, i2c_devices[i].of_device))
  41                         continue;
  42                 if (strlcpy(info->type, i2c_devices[i].i2c_type,
  43                             I2C_NAME_SIZE) >= I2C_NAME_SIZE)
  44                         return -ENOMEM;
  45                 return 0;
  46         }
  47         return -ENODEV;
  48 }
  49
  50 static int __init pasemi_register_i2c_devices(void)
  51 {
  52         struct pci_dev *pdev;
  53         struct device_node *adap_node;
  54         struct device_node *node;
  55
  56         pdev = NULL;
  57         while ((pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa003, pdev))) {
  58                 adap_node = pci_device_to_OF_node(pdev);
  59
  60                 if (!adap_node)
  61                         continue;
  62
  63                 node = NULL;
  64                 while ((node = of_get_next_child(adap_node, node))) {
  65                         struct i2c_board_info info = {};
  66                         const u32 *addr;
  67                         int len;
  68
  69                         addr = of_get_property(node, "reg", &len);
  70                         if (!addr || len < sizeof(int) ||
  71                             *addr > (1 << 10) - 1) {
  72                                 printk(KERN_WARNING
  73                                         "pasemi_register_i2c_devices: "
  74                                         "invalid i2c device entry\n");
  75                                 continue;
  76                         }
  77
  78                         info.irq = irq_of_parse_and_map(node, 0);
  79                         if (!info.irq)
  80                                 info.irq = -1;
  81
  82                         if (find_i2c_driver(node, &info) < 0)
  83                                 continue;
  84
  85                         info.addr = *addr;
  86
  87                         i2c_register_board_info(PCI_FUNC(pdev->devfn), &info,
  88                                                 1);
  89                 }
  90         }
  91         return 0;
  92 }
  93 device_initcall(pasemi_register_i2c_devices);
  94 #endif