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 <log.h>
  11 #include <dm/device-internal.h>
  12 #include <asm/axi.h>
  13
  14 int axi_sandbox_get_emul(struct udevice *bus, ulong address,
  15                          enum axi_size_t size, struct udevice **emulp)
  16 {
  17         struct udevice *dev;
  18         u32 reg[2];
  19         uint offset;
  20
  21         switch (size) {
  22         case AXI_SIZE_8:
  23                 offset = 1;
  24                 break;
  25         case AXI_SIZE_16:
  26                 offset = 2;
  27                 break;
  28         case AXI_SIZE_32:
  29                 offset = 4;
  30                 break;
  31         default:
  32                 debug("%s: Unknown AXI transfer size '%d'", bus->name, size);
  33                 offset = 0;
  34         }
  35
  36         /*
  37          * Note: device_find_* don't activate the devices; they're activated
  38          *       as-needed below.
  39          */
  40         for (device_find_first_child(bus, &dev);
  41              dev;
  42              device_find_next_child(&dev)) {
  43                 int ret;
  44
  45                 ret = dev_read_u32_array(dev, "reg", reg, ARRAY_SIZE(reg));
  46                 if (ret) {
  47                         debug("%s: Could not read 'reg' property of %s\n",
  48                               bus->name, dev->name);
  49                         continue;
  50                 }
  51
  52                 /*
  53                  * Does the transfer's address fall into this device's address
  54                  * space?
  55                  */
  56                 if (address >= reg[0] && address <= reg[0] + reg[1] - offset) {
  57                         /* If yes, activate it... */
  58                         if (device_probe(dev)) {
  59                                 debug("%s: Could not activate %s\n",
  60                                       bus->name, dev->name);
  61                                 return -ENODEV;
  62                         }
  63
  64                         /* ...and return it */
  65                         *emulp = dev;
  66                         return 0;
  67                 }
  68         }
  69
  70         return -ENODEV;
  71 }
  72
  73 int axi_get_store(struct udevice *dev, u8 **storep)
  74 {
  75         struct axi_emul_ops *ops = axi_emul_get_ops(dev);
  76
  77         if (!ops->get_store)
  78                 return -ENOSYS;
  79
  80         return ops->get_store(dev, storep);
  81 }
  82
  83 UCLASS_DRIVER(axi_emul) = {
  84         .id             = UCLASS_AXI_EMUL,
  85         .name           = "axi_emul",
  86 };