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