sandbox_store.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2018
* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
*/
#include <common.h>
#include <axi.h>
#include <dm.h>
#include <malloc.h>
/**
* struct sandbox_store_priv - Private data structure of a AXI store device
* @store: The buffer holding the device's internal memory, which is read from
* and written to using the driver's methods
*/
struct sandbox_store_priv {
u8 *store;
};
/**
* copy_axi_data() - Copy data from source to destination with a given AXI
* transfer width
* @src: Pointer to the data source from where data will be read
* @dst: Pointer to the data destination where data will be written to
* @size: Size of the data to be copied given by a axi_size_t enum value
*
* Return: 0 if OK, -ve on error
*/
static int copy_axi_data(void *src, void *dst, enum axi_size_t size)
{
switch (size) {
case AXI_SIZE_8:
*((u8 *)dst) = *((u8 *)src);
return 0;
case AXI_SIZE_16:
*((u16 *)dst) = be16_to_cpu(*((u16 *)src));
return 0;
case AXI_SIZE_32:
*((u32 *)dst) = be32_to_cpu(*((u32 *)src));
return 0;
default:
debug("%s: Unknown AXI transfer size '%d'\n", __func__, size);
return -EINVAL;
}
}
static int sandbox_store_read(struct udevice *dev, ulong address, void *data,
enum axi_size_t size)
{
struct sandbox_store_priv *priv = dev_get_priv(dev);
return copy_axi_data(priv->store + address, data, size);
}
static int sandbox_store_write(struct udevice *dev, ulong address, void *data,
enum axi_size_t size)
{
struct sandbox_store_priv *priv = dev_get_priv(dev);
return copy_axi_data(data, priv->store + address, size);
}
static int sandbox_store_get_store(struct udevice *dev, u8 **store)
{
struct sandbox_store_priv *priv = dev_get_priv(dev);
*store = priv->store;
return 0;
}
static const struct udevice_id sandbox_store_ids[] = {
{ .compatible = "sandbox,sandbox_store" },
{ /* sentinel */ }
};
static const struct axi_emul_ops sandbox_store_ops = {
.read = sandbox_store_read,
.write = sandbox_store_write,
.get_store = sandbox_store_get_store,
};
static int sandbox_store_probe(struct udevice *dev)
{
struct sandbox_store_priv *priv = dev_get_priv(dev);
u32 reg[2];
int ret;
ret = dev_read_u32_array(dev, "reg", reg, ARRAY_SIZE(reg));
if (ret) {
debug("%s: Could not read 'reg' property\n", dev->name);
return -EINVAL;
}
/*
* Allocate the device's internal storage that will be read
* from/written to
*/
priv->store = calloc(reg[1], 1);
if (!priv->store)
return -ENOMEM;
return 0;
}
static int sandbox_store_remove(struct udevice *dev)
{
struct sandbox_store_priv *priv = dev_get_priv(dev);
free(priv->store);
return 0;
}
U_BOOT_DRIVER(sandbox_axi_store) = {
.name = "sandbox_axi_store",
.id = UCLASS_AXI_EMUL,
.of_match = sandbox_store_ids,
.ops = &sandbox_store_ops,
.priv_auto_alloc_size = sizeof(struct sandbox_store_priv),
.probe = sandbox_store_probe,
.remove = sandbox_store_remove,
};