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// SPDX-License-Identifier: GPL-2.0+
/*
* Sandbox interface for QFW
*
* (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
* (C) Copyright 2021 Asherah Connor <ashe@kivikakk.ee>
*/
#define LOG_CATEGORY UCLASS_QFW
#include <asm/types.h>
#include <asm/io.h>
#include <dm.h>
#include <dm/device.h>
#include <qfw.h>
struct qfw_sandbox_plat {
u8 file_dir_offset;
};
static void qfw_sandbox_read_entry_io(struct udevice *dev, u16 entry, u32 size,
void *address)
{
debug("%s: entry 0x%x size %u address %p\n", __func__, entry, size,
address);
switch (entry) {
case FW_CFG_SIGNATURE:
if (size == 4)
*((u32 *)address) = cpu_to_be32(QEMU_FW_CFG_SIGNATURE);
break;
case FW_CFG_ID:
/* Advertise DMA support */
if (size == 1)
*((u8 *)address) = FW_CFG_DMA_ENABLED;
break;
default:
debug("%s got unsupported entry 0x%x\n", __func__, entry);
/*
* Sandbox driver doesn't support other entries here, assume we use DMA
* to read them -- the uclass driver will exclusively use it when
* advertised.
*/
}
}
static void qfw_sandbox_read_entry_dma(struct udevice *dev, struct qfw_dma *dma)
{
u16 entry;
u32 control = be32_to_cpu(dma->control);
void *address = (void *)(uintptr_t)be64_to_cpu(dma->address);
u32 length = be32_to_cpu(dma->length);
struct qfw_sandbox_plat *plat = dev_get_plat(dev);
struct fw_cfg_file *file;
debug("%s\n", __func__);
if (!(control & FW_CFG_DMA_READ))
return;
if (control & FW_CFG_DMA_SELECT) {
/* Start new read. */
entry = control >> 16;
/* Arbitrary values to be used by tests. */
switch (entry) {
case FW_CFG_NB_CPUS:
if (length == 2)
*((u16 *)address) = cpu_to_le16(5);
break;
case FW_CFG_FILE_DIR:
if (length == 4) {
*((u32 *)address) = cpu_to_be32(2);
plat->file_dir_offset = 1;
}
break;
default:
debug("%s got unsupported entry 0x%x\n", __func__,
entry);
}
} else if (plat->file_dir_offset && length == 64) {
file = address;
switch (plat->file_dir_offset) {
case 1:
file->size = cpu_to_be32(8);
file->select = cpu_to_be16(FW_CFG_FILE_FIRST);
strcpy(file->name, "test-one");
plat->file_dir_offset++;
break;
case 2:
file->size = cpu_to_be32(8);
file->select = cpu_to_be16(FW_CFG_FILE_FIRST + 1);
strcpy(file->name, "test-two");
plat->file_dir_offset++;
break;
}
}
/*
* Signal that we are finished. No-one checks this in sandbox --
* normally the platform-specific driver looks for it -- but let's
* replicate the behaviour in case someone relies on it later.
*/
dma->control = 0;
}
static int qfw_sandbox_probe(struct udevice *dev)
{
return qfw_register(dev);
}
static struct dm_qfw_ops qfw_sandbox_ops = {
.read_entry_io = qfw_sandbox_read_entry_io,
.read_entry_dma = qfw_sandbox_read_entry_dma,
};
U_BOOT_DRIVER(qfw_sandbox) = {
.name = "qfw_sandbox",
.id = UCLASS_QFW,
.plat_auto = sizeof(struct qfw_sandbox_plat),
.probe = qfw_sandbox_probe,
.ops = &qfw_sandbox_ops,
};
U_BOOT_DRVINFO(qfw_sandbox) = {
.name = "qfw_sandbox",
};
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