LXR uboot/drivers/axi/sandbox

   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 <malloc.h>
  12
  13/**
  14 * struct sandbox_store_priv - Private data structure of a AXI store device
  15 * @store: The buffer holding the device's internal memory, which is read from
  16 *         and written to using the driver's methods
  17 */
  18struct sandbox_store_priv {
  19        u8 *store;
  20};
  21
  22/**
  23 * copy_axi_data() - Copy data from source to destination with a given AXI
  24 *                   transfer width
  25 * @src:  Pointer to the data source from where data will be read
  26 * @dst:  Pointer to the data destination where data will be written to
  27 * @size: Size of the data to be copied given by a axi_size_t enum value
  28 *
  29 * Return: 0 if OK, -ve on error
  30 */
  31static int copy_axi_data(void *src, void *dst, enum axi_size_t size)
  32{
  33        switch (size) {
  34        case AXI_SIZE_8:
  35                *((u8 *)dst) = *((u8 *)src);
  36                return 0;
  37        case AXI_SIZE_16:
  38                *((u16 *)dst) = be16_to_cpu(*((u16 *)src));
  39                return 0;
  40        case AXI_SIZE_32:
  41                *((u32 *)dst) = be32_to_cpu(*((u32 *)src));
  42                return 0;
  43        default:
  44                debug("%s: Unknown AXI transfer size '%d'\n", __func__, size);
  45                return -EINVAL;
  46        }
  47}
  48
  49static int sandbox_store_read(struct udevice *dev, ulong address, void *data,
  50                              enum axi_size_t size)
  51{
  52        struct sandbox_store_priv *priv = dev_get_priv(dev);
  53
  54        return copy_axi_data(priv->store + address, data, size);
  55}
  56
  57static int sandbox_store_write(struct udevice *dev, ulong address, void *data,
  58                               enum axi_size_t size)
  59{
  60        struct sandbox_store_priv *priv = dev_get_priv(dev);
  61
  62        return copy_axi_data(data, priv->store + address, size);
  63}
  64
  65static int sandbox_store_get_store(struct udevice *dev, u8 **store)
  66{
  67        struct sandbox_store_priv *priv = dev_get_priv(dev);
  68
  69        *store = priv->store;
  70
  71        return 0;
  72}
  73
  74static const struct udevice_id sandbox_store_ids[] = {
  75        { .compatible = "sandbox,sandbox_store" },
  76        { /* sentinel */ }
  77};
  78
  79static const struct axi_emul_ops sandbox_store_ops = {
  80        .read = sandbox_store_read,
  81        .write = sandbox_store_write,
  82        .get_store = sandbox_store_get_store,
  83};
  84
  85static int sandbox_store_probe(struct udevice *dev)
  86{
  87        struct sandbox_store_priv *priv = dev_get_priv(dev);
  88        u32 reg[2];
  89        int ret;
  90
  91        ret = dev_read_u32_array(dev, "reg", reg, ARRAY_SIZE(reg));
  92        if (ret) {
  93                debug("%s: Could not read 'reg' property\n", dev->name);
  94                return -EINVAL;
  95        }
  96
  97        /*
  98         * Allocate the device's internal storage that will be read
  99         * from/written to
 100         */
 101        priv->store = calloc(reg[1], 1);
 102        if (!priv->store)
 103                return -ENOMEM;
 104
 105        return 0;
 106}
 107
 108static int sandbox_store_remove(struct udevice *dev)
 109{
 110        struct sandbox_store_priv *priv = dev_get_priv(dev);
 111
 112        free(priv->store);
 113
 114        return 0;
 115}
 116
 117U_BOOT_DRIVER(sandbox_axi_store) = {
 118        .name           = "sandbox_axi_store",
 119        .id             = UCLASS_AXI_EMUL,
 120        .of_match       = sandbox_store_ids,
 121        .ops            = &sandbox_store_ops,
 122        .priv_auto      = sizeof(struct sandbox_store_priv),
 123        .probe          = sandbox_store_probe,
 124        .remove         = sandbox_store_remove,
 125};
 126