28b764aafe
The existing code reads a single byte into a 32-bit variable. It works fine but is a bit confusing. There is no need to read only one byte, so update it to read the whole 32 bits. Series-to: u-boot Cover-letter: emulation: Expand qfw and virtio commands This series adds various features to the qfw command, mostly targeting x86-specific features: - commands to show the E820, ACPI-loader, etc. provided by QMEU - unit tests for the qfw command - virtio subcommand to list the devices The bdinfo command contains some useful printing function which could be used more generally in U-Boot. This series moves those into the lib/ directory and renames them to be more generic. Various clean-ups are included, such as documentation for the virtio fw_cfg selectors. This series includes some minor test/ fixes noticed when creating this series. It also brings in a few qconfig patches which didn't make it into the main U-Boot tree. END Signed-off-by: Simon Glass <sjg@chromium.org>
128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Sandbox interface for QFW
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*
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* (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
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* (C) Copyright 2021 Asherah Connor <ashe@kivikakk.ee>
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*/
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#define LOG_CATEGORY UCLASS_QFW
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#include <asm/types.h>
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#include <asm/io.h>
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#include <dm.h>
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#include <dm/device.h>
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#include <qfw.h>
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struct qfw_sandbox_plat {
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u8 file_dir_offset;
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};
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static void qfw_sandbox_read_entry_io(struct udevice *dev, u16 entry, u32 size,
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void *address)
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{
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debug("%s: entry 0x%x size %u address %p\n", __func__, entry, size,
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address);
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switch (entry) {
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case FW_CFG_SIGNATURE:
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if (size == 4)
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*((u32 *)address) = cpu_to_be32(QEMU_FW_CFG_SIGNATURE);
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break;
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case FW_CFG_ID:
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/* Advertise DMA support */
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if (size == 4)
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*((u32 *)address) = FW_CFG_DMA_ENABLED;
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break;
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default:
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debug("%s got unsupported entry 0x%x\n", __func__, entry);
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/*
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* Sandbox driver doesn't support other entries here, assume we use DMA
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* to read them -- the uclass driver will exclusively use it when
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* advertised.
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*/
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}
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}
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static void qfw_sandbox_read_entry_dma(struct udevice *dev, struct qfw_dma *dma)
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{
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u16 entry;
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u32 control = be32_to_cpu(dma->control);
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void *address = (void *)(uintptr_t)be64_to_cpu(dma->address);
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u32 length = be32_to_cpu(dma->length);
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struct qfw_sandbox_plat *plat = dev_get_plat(dev);
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struct fw_cfg_file *file;
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debug("%s\n", __func__);
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if (!(control & FW_CFG_DMA_READ))
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return;
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if (control & FW_CFG_DMA_SELECT) {
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/* Start new read. */
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entry = control >> 16;
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/* Arbitrary values to be used by tests. */
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switch (entry) {
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case FW_CFG_NB_CPUS:
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if (length == 2)
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*((u16 *)address) = cpu_to_le16(5);
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break;
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case FW_CFG_FILE_DIR:
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if (length == 4) {
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*((u32 *)address) = cpu_to_be32(2);
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plat->file_dir_offset = 1;
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}
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break;
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default:
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debug("%s got unsupported entry 0x%x\n", __func__,
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entry);
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}
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} else if (plat->file_dir_offset && length == 64) {
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file = address;
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switch (plat->file_dir_offset) {
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case 1:
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file->size = cpu_to_be32(8);
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file->select = cpu_to_be16(FW_CFG_FILE_FIRST);
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strcpy(file->name, "test-one");
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plat->file_dir_offset++;
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break;
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case 2:
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file->size = cpu_to_be32(8);
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file->select = cpu_to_be16(FW_CFG_FILE_FIRST + 1);
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strcpy(file->name, "test-two");
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plat->file_dir_offset++;
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break;
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}
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}
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/*
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* Signal that we are finished. No-one checks this in sandbox --
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* normally the platform-specific driver looks for it -- but let's
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* replicate the behaviour in case someone relies on it later.
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*/
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dma->control = 0;
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}
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static int qfw_sandbox_probe(struct udevice *dev)
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{
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return qfw_register(dev);
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}
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static struct dm_qfw_ops qfw_sandbox_ops = {
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.read_entry_io = qfw_sandbox_read_entry_io,
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.read_entry_dma = qfw_sandbox_read_entry_dma,
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};
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U_BOOT_DRIVER(qfw_sandbox) = {
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.name = "qfw_sandbox",
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.id = UCLASS_QFW,
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.plat_auto = sizeof(struct qfw_sandbox_plat),
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.probe = qfw_sandbox_probe,
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.ops = &qfw_sandbox_ops,
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};
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U_BOOT_DRVINFO(qfw_sandbox) = {
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.name = "qfw_sandbox",
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};
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