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