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 #define LOG_CATEGORY UCLASS_AXI_EMUL
   8
   9 #include <common.h>
  10 #include <axi.h>
  11 #include <dm.h>
  12 #include <log.h>
  13 #include <dm/device-internal.h>
  14 #include <asm/axi.h>
  15
  16 int axi_sandbox_get_emul(struct udevice *bus, ulong address,
  17                          enum axi_size_t size, struct udevice **emulp)
  18 {
  19         struct udevice *dev;
  20         u32 reg[2];
  21         uint offset;
  22
  23         switch (size) {
  24         case AXI_SIZE_8:
  25                 offset = 1;
  26                 break;
  27         case AXI_SIZE_16:
  28                 offset = 2;
  29                 break;
  30         case AXI_SIZE_32:
  31                 offset = 4;
  32                 break;
  33         default:
  34                 debug("%s: Unknown AXI transfer size '%d'", bus->name, size);
  35                 offset = 0;
  36         }
  37
  38         /*
  39          * Note: device_find_* don't activate the devices; they're activated
  40          *       as-needed below.
  41          */
  42         for (device_find_first_child(bus, &dev);
  43              dev;
  44              device_find_next_child(&dev)) {
  45                 int ret;
  46
  47                 ret = dev_read_u32_array(dev, "reg", reg, ARRAY_SIZE(reg));
  48                 if (ret) {
  49                         debug("%s: Could not read 'reg' property of %s\n",
  50                               bus->name, dev->name);
  51                         continue;
  52                 }
  53
  54                 /*
  55                  * Does the transfer's address fall into this device's address
  56                  * space?
  57                  */
  58                 if (address >= reg[0] && address <= reg[0] + reg[1] - offset) {
  59                         /* If yes, activate it... */
  60                         if (device_probe(dev)) {
  61                                 debug("%s: Could not activate %s\n",
  62                                       bus->name, dev->name);
  63                                 return -ENODEV;
  64                         }
  65
  66                         /* ...and return it */
  67                         *emulp = dev;
  68                         return 0;
  69                 }
  70         }
  71
  72         return -ENODEV;
  73 }
  74
  75 int axi_get_store(struct udevice *dev, u8 **storep)
  76 {
  77         struct axi_emul_ops *ops = axi_emul_get_ops(dev);
  78
  79         if (!ops->get_store)
  80                 return -ENOSYS;
  81
  82         return ops->get_store(dev, storep);
  83 }
  84
  85 UCLASS_DRIVER(axi_emul) = {
  86         .id             = UCLASS_AXI_EMUL,
  87         .name           = "axi_emul",
  88 };