u-boot/drivers/misc/qfw.c
Asherah Connor 5b0b43e0e2 x86: qemu: move QFW to its own uclass
We move qfw into its own uclass and split the PIO functions into a
specific driver for that uclass.  The PIO driver is selected in the
qemu-x86 board config (this covers x86 and x86_64).

include/qfw.h is cleaned up and documentation added.

Signed-off-by: Asherah Connor <ashe@kivikakk.ee>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
2021-04-12 17:44:55 -04:00

319 lines
8 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
* (C) Copyright 2021 Asherah Connor <ashe@kivikakk.ee>
*/
#define LOG_CATEGORY UCLASS_QFW
#include <common.h>
#include <command.h>
#include <errno.h>
#include <log.h>
#include <malloc.h>
#include <qfw.h>
#include <dm.h>
#include <misc.h>
#ifdef CONFIG_GENERATE_ACPI_TABLE
#include <asm/tables.h>
#endif
#ifdef CONFIG_GENERATE_ACPI_TABLE
/*
* This function allocates memory for ACPI tables
*
* @entry : BIOS linker command entry which tells where to allocate memory
* (either high memory or low memory)
* @addr : The address that should be used for low memory allcation. If the
* memory allocation request is 'ZONE_HIGH' then this parameter will
* be ignored.
* @return: 0 on success, or negative value on failure
*/
static int bios_linker_allocate(struct udevice *dev,
struct bios_linker_entry *entry, ulong *addr)
{
uint32_t size, align;
struct fw_file *file;
unsigned long aligned_addr;
align = le32_to_cpu(entry->alloc.align);
/* align must be power of 2 */
if (align & (align - 1)) {
printf("error: wrong alignment %u\n", align);
return -EINVAL;
}
file = qfw_find_file(dev, entry->alloc.file);
if (!file) {
printf("error: can't find file %s\n", entry->alloc.file);
return -ENOENT;
}
size = be32_to_cpu(file->cfg.size);
/*
* ZONE_HIGH means we need to allocate from high memory, since
* malloc space is already at the end of RAM, so we directly use it.
* If allocation zone is ZONE_FSEG, then we use the 'addr' passed
* in which is low memory
*/
if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) {
aligned_addr = (unsigned long)memalign(align, size);
if (!aligned_addr) {
printf("error: allocating resource\n");
return -ENOMEM;
}
} else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
aligned_addr = ALIGN(*addr, align);
} else {
printf("error: invalid allocation zone\n");
return -EINVAL;
}
debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n",
file->cfg.name, size, entry->alloc.zone, align, aligned_addr);
qfw_read_entry(dev, be16_to_cpu(file->cfg.select), size,
(void *)aligned_addr);
file->addr = aligned_addr;
/* adjust address for low memory allocation */
if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG)
*addr = (aligned_addr + size);
return 0;
}
/*
* This function patches ACPI tables previously loaded
* by bios_linker_allocate()
*
* @entry : BIOS linker command entry which tells how to patch
* ACPI tables
* @return: 0 on success, or negative value on failure
*/
static int bios_linker_add_pointer(struct udevice *dev,
struct bios_linker_entry *entry)
{
struct fw_file *dest, *src;
uint32_t offset = le32_to_cpu(entry->pointer.offset);
uint64_t pointer = 0;
dest = qfw_find_file(dev, entry->pointer.dest_file);
if (!dest || !dest->addr)
return -ENOENT;
src = qfw_find_file(dev, entry->pointer.src_file);
if (!src || !src->addr)
return -ENOENT;
debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n",
dest->addr, src->addr, offset, entry->pointer.size, pointer);
memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size);
pointer = le64_to_cpu(pointer);
pointer += (unsigned long)src->addr;
pointer = cpu_to_le64(pointer);
memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size);
return 0;
}
/*
* This function updates checksum fields of ACPI tables previously loaded
* by bios_linker_allocate()
*
* @entry : BIOS linker command entry which tells where to update ACPI table
* checksums
* @return: 0 on success, or negative value on failure
*/
static int bios_linker_add_checksum(struct udevice *dev,
struct bios_linker_entry *entry)
{
struct fw_file *file;
uint8_t *data, cksum = 0;
uint8_t *cksum_start;
file = qfw_find_file(dev, entry->cksum.file);
if (!file || !file->addr)
return -ENOENT;
data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset));
cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start));
cksum = table_compute_checksum(cksum_start,
le32_to_cpu(entry->cksum.length));
*data = cksum;
return 0;
}
/* This function loads and patches ACPI tables provided by QEMU */
ulong write_acpi_tables(ulong addr)
{
int i, ret;
struct fw_file *file;
struct bios_linker_entry *table_loader;
struct bios_linker_entry *entry;
uint32_t size;
struct udevice *dev;
ret = qfw_get_dev(&dev);
if (ret) {
printf("error: no qfw\n");
return addr;
}
/* make sure fw_list is loaded */
ret = qfw_read_firmware_list(dev);
if (ret) {
printf("error: can't read firmware file list\n");
return addr;
}
file = qfw_find_file(dev, "etc/table-loader");
if (!file) {
printf("error: can't find etc/table-loader\n");
return addr;
}
size = be32_to_cpu(file->cfg.size);
if ((size % sizeof(*entry)) != 0) {
printf("error: table-loader maybe corrupted\n");
return addr;
}
table_loader = malloc(size);
if (!table_loader) {
printf("error: no memory for table-loader\n");
return addr;
}
qfw_read_entry(dev, be16_to_cpu(file->cfg.select), size, table_loader);
for (i = 0; i < (size / sizeof(*entry)); i++) {
entry = table_loader + i;
switch (le32_to_cpu(entry->command)) {
case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
ret = bios_linker_allocate(dev, entry, &addr);
if (ret)
goto out;
break;
case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
ret = bios_linker_add_pointer(dev, entry);
if (ret)
goto out;
break;
case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
ret = bios_linker_add_checksum(dev, entry);
if (ret)
goto out;
break;
default:
break;
}
}
out:
if (ret) {
struct fw_cfg_file_iter iter;
for (file = qfw_file_iter_init(dev, &iter);
!qfw_file_iter_end(&iter);
file = qfw_file_iter_next(&iter)) {
if (file->addr) {
free((void *)file->addr);
file->addr = 0;
}
}
}
free(table_loader);
return addr;
}
ulong acpi_get_rsdp_addr(void)
{
int ret;
struct fw_file *file;
struct udevice *dev;
ret = qfw_get_dev(&dev);
if (ret) {
printf("error: no qfw\n");
return 0;
}
file = qfw_find_file(dev, "etc/acpi/rsdp");
return file->addr;
}
#endif
static void qfw_read_entry_io(struct qfw_dev *qdev, u16 entry, u32 size,
void *address)
{
struct dm_qfw_ops *ops = dm_qfw_get_ops(qdev->dev);
debug("%s: entry 0x%x, size %u address %p\n", __func__, entry, size,
address);
ops->read_entry_io(qdev->dev, entry, size, address);
}
static void qfw_read_entry_dma(struct qfw_dev *qdev, u16 entry, u32 size,
void *address)
{
struct dm_qfw_ops *ops = dm_qfw_get_ops(qdev->dev);
struct qfw_dma dma = {
.length = cpu_to_be32(size),
.address = cpu_to_be64((uintptr_t)address),
.control = cpu_to_be32(FW_CFG_DMA_READ),
};
/*
* writing FW_CFG_INVALID will cause read operation to resume at last
* offset, otherwise read will start at offset 0
*/
if (entry != FW_CFG_INVALID)
dma.control |= cpu_to_be32(FW_CFG_DMA_SELECT | (entry << 16));
debug("%s: entry 0x%x, size %u address %p, control 0x%x\n", __func__,
entry, size, address, be32_to_cpu(dma.control));
barrier();
ops->read_entry_dma(qdev->dev, &dma);
}
void qfw_read_entry(struct udevice *dev, u16 entry, u32 size, void *address)
{
struct qfw_dev *qdev = dev_get_uclass_priv(dev);
if (qdev->dma_present)
qfw_read_entry_dma(qdev, entry, size, address);
else
qfw_read_entry_io(qdev, entry, size, address);
}
int qfw_register(struct udevice *dev)
{
struct qfw_dev *qdev = dev_get_uclass_priv(dev);
u32 qemu, dma_enabled;
qdev->dev = dev;
INIT_LIST_HEAD(&qdev->fw_list);
qfw_read_entry_io(qdev, FW_CFG_SIGNATURE, 4, &qemu);
if (be32_to_cpu(qemu) != QEMU_FW_CFG_SIGNATURE)
return -ENODEV;
qfw_read_entry_io(qdev, FW_CFG_ID, 1, &dma_enabled);
if (dma_enabled & FW_CFG_DMA_ENABLED)
qdev->dma_present = true;
return 0;
}
UCLASS_DRIVER(qfw) = {
.id = UCLASS_QFW,
.name = "qfw",
.per_device_auto = sizeof(struct qfw_dev),
};