arch/powerpc/platforms/pasemi/misc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2007 PA Semi, Inc
   4  *
   5  * Parts based on arch/powerpc/sysdev/fsl_soc.c:
   6  *
   7  * 2006 (c) MontaVista Software, Inc.
   8  */
   9
  10 #include <linux/errno.h>
  11 #include <linux/kernel.h>
  12 #include <linux/pci.h>
  13 #include <linux/of.h>
  14 #include <linux/of_irq.h>
  15 #include <linux/i2c.h>
  16
  17 #ifdef CONFIG_I2C_BOARDINFO
  18 /* The below is from fsl_soc.c.  It's copied because since there are no
  19  * official bus bindings at this time it doesn't make sense to share across
  20  * the platforms, even though they happen to be common.
  21  */
  22 struct i2c_driver_device {
  23         char    *of_device;
  24         char    *i2c_type;
  25 };
  26
  27 static struct i2c_driver_device i2c_devices[] __initdata = {
  28         {"dallas,ds1338",  "ds1338"},
  29 };
  30
  31 static int __init find_i2c_driver(struct device_node *node,
  32                                      struct i2c_board_info *info)
  33 {
  34         int i;
  35
  36         for (i = 0; i < ARRAY_SIZE(i2c_devices); i++) {
  37                 if (!of_device_is_compatible(node, i2c_devices[i].of_device))
  38                         continue;
  39                 if (strlcpy(info->type, i2c_devices[i].i2c_type,
  40                             I2C_NAME_SIZE) >= I2C_NAME_SIZE)
  41                         return -ENOMEM;
  42                 return 0;
  43         }
  44         return -ENODEV;
  45 }
  46
  47 static int __init pasemi_register_i2c_devices(void)
  48 {
  49         struct pci_dev *pdev;
  50         struct device_node *adap_node;
  51         struct device_node *node;
  52
  53         pdev = NULL;
  54         while ((pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa003, pdev))) {
  55                 adap_node = pci_device_to_OF_node(pdev);
  56
  57                 if (!adap_node)
  58                         continue;
  59
  60                 for_each_child_of_node(adap_node, node) {
  61                         struct i2c_board_info info = {};
  62                         const u32 *addr;
  63                         int len;
  64
  65                         addr = of_get_property(node, "reg", &len);
  66                         if (!addr || len < sizeof(int) ||
  67                             *addr > (1 << 10) - 1) {
  68                                 pr_warn("pasemi_register_i2c_devices: invalid i2c device entry\n");
  69                                 continue;
  70                         }
  71
  72                         info.irq = irq_of_parse_and_map(node, 0);
  73                         if (!info.irq)
  74                                 info.irq = -1;
  75
  76                         if (find_i2c_driver(node, &info) < 0)
  77                                 continue;
  78
  79                         info.addr = *addr;
  80
  81                         i2c_register_board_info(PCI_FUNC(pdev->devfn), &info,
  82                                                 1);
  83                 }
  84         }
  85         return 0;
  86 }
  87 device_initcall(pasemi_register_i2c_devices);
  88 #endif