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
  11/**
  12 * struct sandbox_store_priv - Private data structure of a AXI store device
  13 * @store: The buffer holding the device's internal memory, which is read from
  14 *         and written to using the driver's methods
  15 */
  16struct sandbox_store_priv {
  17        u8 *store;
  18};
  19
  20/**
  21 * copy_axi_data() - Copy data from source to destination with a given AXI
  22 *                   transfer width
  23 * @src:  Pointer to the data source from where data will be read
  24 * @dst:  Pointer to the data destination where data will be written to
  25 * @size: Size of the data to be copied given by a axi_size_t enum value
  26 *
  27 * Return: 0 if OK, -ve on error
  28 */
  29static int copy_axi_data(void *src, void *dst, enum axi_size_t size)
  30{
  31        switch (size) {
  32        case AXI_SIZE_8:
  33                *((u8 *)dst) = *((u8 *)src);
  34                return 0;
  35        case AXI_SIZE_16:
  36                *((u16 *)dst) = be16_to_cpu(*((u16 *)src));
  37                return 0;
  38        case AXI_SIZE_32:
  39                *((u32 *)dst) = be32_to_cpu(*((u32 *)src));
  40                return 0;
  41        default:
  42                debug("%s: Unknown AXI transfer size '%d'\n", __func__, size);
  43                return -EINVAL;
  44        }
  45}
  46
  47static int sandbox_store_read(struct udevice *dev, ulong address, void *data,
  48                              enum axi_size_t size)
  49{
  50        struct sandbox_store_priv *priv = dev_get_priv(dev);
  51
  52        return copy_axi_data(priv->store + address, data, size);
  53}
  54
  55static int sandbox_store_write(struct udevice *dev, ulong address, void *data,
  56                               enum axi_size_t size)
  57{
  58        struct sandbox_store_priv *priv = dev_get_priv(dev);
  59
  60        return copy_axi_data(data, priv->store + address, size);
  61}
  62
  63static int sandbox_store_get_store(struct udevice *dev, u8 **store)
  64{
  65        struct sandbox_store_priv *priv = dev_get_priv(dev);
  66
  67        *store = priv->store;
  68
  69        return 0;
  70}
  71
  72static const struct udevice_id sandbox_store_ids[] = {
  73        { .compatible = "sandbox,sandbox_store" },
  74        { /* sentinel */ }
  75};
  76
  77static const struct axi_emul_ops sandbox_store_ops = {
  78        .read = sandbox_store_read,
  79        .write = sandbox_store_write,
  80        .get_store = sandbox_store_get_store,
  81};
  82
  83static int sandbox_store_probe(struct udevice *dev)
  84{
  85        struct sandbox_store_priv *priv = dev_get_priv(dev);
  86        u32 reg[2];
  87        int ret;
  88
  89        ret = dev_read_u32_array(dev, "reg", reg, ARRAY_SIZE(reg));
  90        if (ret) {
  91                debug("%s: Could not read 'reg' property\n", dev->name);
  92                return -EINVAL;
  93        }
  94
  95        /*
  96         * Allocate the device's internal storage that will be read
  97         * from/written to
  98         */
  99        priv->store = calloc(reg[1], 1);
 100        if (!priv->store)
 101                return -ENOMEM;
 102
 103        return 0;
 104}
 105
 106static int sandbox_store_remove(struct udevice *dev)
 107{
 108        struct sandbox_store_priv *priv = dev_get_priv(dev);
 109
 110        free(priv->store);
 111
 112        return 0;
 113}
 114
 115U_BOOT_DRIVER(sandbox_axi_store) = {
 116        .name           = "sandbox_axi_store",
 117        .id             = UCLASS_AXI_EMUL,
 118        .of_match       = sandbox_store_ids,
 119        .ops            = &sandbox_store_ops,
 120        .priv_auto_alloc_size = sizeof(struct sandbox_store_priv),
 121        .probe          = sandbox_store_probe,
 122        .remove         = sandbox_store_remove,
 123};
 124