drivers/axi/axi-emul-uclass.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2018
   4  * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
   5  */
   6
   7 #include <common.h>
   8 #include <axi.h>
   9 #include <dm.h>
  10 #include <dm/device-internal.h>
  11 #include <asm/axi.h>
  12
  13 int axi_sandbox_get_emul(struct udevice *bus, ulong address,
  14                          enum axi_size_t size, struct udevice **emulp)
  15 {
  16         struct udevice *dev;
  17         u32 reg[2];
  18         uint offset;
  19
  20         switch (size) {
  21         case AXI_SIZE_8:
  22                 offset = 1;
  23                 break;
  24         case AXI_SIZE_16:
  25                 offset = 2;
  26                 break;
  27         case AXI_SIZE_32:
  28                 offset = 4;
  29                 break;
  30         default:
  31                 debug("%s: Unknown AXI transfer size '%d'", bus->name, size);
  32                 offset = 0;
  33         }
  34
  35         /*
  36          * Note: device_find_* don't activate the devices; they're activated
  37          *       as-needed below.
  38          */
  39         for (device_find_first_child(bus, &dev);
  40              dev;
  41              device_find_next_child(&dev)) {
  42                 int ret;
  43
  44                 ret = dev_read_u32_array(dev, "reg", reg, ARRAY_SIZE(reg));
  45                 if (ret) {
  46                         debug("%s: Could not read 'reg' property of %s\n",
  47                               bus->name, dev->name);
  48                         continue;
  49                 }
  50
  51                 /*
  52                  * Does the transfer's address fall into this device's address
  53                  * space?
  54                  */
  55                 if (address >= reg[0] && address <= reg[0] + reg[1] - offset) {
  56                         /* If yes, activate it... */
  57                         if (device_probe(dev)) {
  58                                 debug("%s: Could not activate %s\n",
  59                                       bus->name, dev->name);
  60                                 return -ENODEV;
  61                         }
  62
  63                         /* ...and return it */
  64                         *emulp = dev;
  65                         return 0;
  66                 }
  67         }
  68
  69         return -ENODEV;
  70 }
  71
  72 int axi_get_store(struct udevice *dev, u8 **storep)
  73 {
  74         struct axi_emul_ops *ops = axi_emul_get_ops(dev);
  75
  76         if (!ops->get_store)
  77                 return -ENOSYS;
  78
  79         return ops->get_store(dev, storep);
  80 }
  81
  82 UCLASS_DRIVER(axi_emul) = {
  83         .id             = UCLASS_AXI_EMUL,
  84         .name           = "axi_emul",
  85 };