u-boot/common/spl/spl_fit.c

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/*
* Copyright (C) 2016 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <errno.h>
#include <image.h>
#include <libfdt.h>
#include <spl.h>
static ulong fdt_getprop_u32(const void *fdt, int node, const char *prop)
{
const u32 *cell;
int len;
cell = fdt_getprop(fdt, node, prop, &len);
if (len != sizeof(*cell))
return -1U;
return fdt32_to_cpu(*cell);
}
static int spl_fit_select_fdt(const void *fdt, int images, int *fdt_offsetp)
{
const char *name, *fdt_name;
int conf, node, fdt_node;
int len;
*fdt_offsetp = 0;
conf = fdt_path_offset(fdt, FIT_CONFS_PATH);
if (conf < 0) {
debug("%s: Cannot find /configurations node: %d\n", __func__,
conf);
return -EINVAL;
}
for (node = fdt_first_subnode(fdt, conf);
node >= 0;
node = fdt_next_subnode(fdt, node)) {
name = fdt_getprop(fdt, node, "description", &len);
if (!name) {
#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
printf("%s: Missing FDT description in DTB\n",
__func__);
#endif
return -EINVAL;
}
if (board_fit_config_name_match(name))
continue;
debug("Selecting config '%s'", name);
fdt_name = fdt_getprop(fdt, node, FIT_FDT_PROP, &len);
if (!fdt_name) {
debug("%s: Cannot find fdt name property: %d\n",
__func__, len);
return -EINVAL;
}
debug(", fdt '%s'\n", fdt_name);
fdt_node = fdt_subnode_offset(fdt, images, fdt_name);
if (fdt_node < 0) {
debug("%s: Cannot find fdt node '%s': %d\n",
__func__, fdt_name, fdt_node);
return -EINVAL;
}
*fdt_offsetp = fdt_getprop_u32(fdt, fdt_node, "data-offset");
len = fdt_getprop_u32(fdt, fdt_node, "data-size");
debug("FIT: Selected '%s'\n", name);
return len;
}
#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
printf("No matching DT out of these options:\n");
for (node = fdt_first_subnode(fdt, conf);
node >= 0;
node = fdt_next_subnode(fdt, node)) {
name = fdt_getprop(fdt, node, "name", &len);
printf(" %s\n", name);
}
#endif
return -ENOENT;
}
static int get_aligned_image_offset(struct spl_load_info *info, int offset)
{
/*
* If it is a FS read, get the first address before offset which is
* aligned to ARCH_DMA_MINALIGN. If it is raw read return the
* block number to which offset belongs.
*/
if (info->filename)
return offset & ~(ARCH_DMA_MINALIGN - 1);
return offset / info->bl_len;
}
static int get_aligned_image_overhead(struct spl_load_info *info, int offset)
{
/*
* If it is a FS read, get the difference between the offset and
* the first address before offset which is aligned to
* ARCH_DMA_MINALIGN. If it is raw read return the offset within the
* block.
*/
if (info->filename)
return offset & (ARCH_DMA_MINALIGN - 1);
return offset % info->bl_len;
}
static int get_aligned_image_size(struct spl_load_info *info, int data_size,
int offset)
{
if (info->filename)
return data_size + get_aligned_image_overhead(info, offset);
return (data_size + info->bl_len - 1) / info->bl_len;
}
int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
{
int sectors;
ulong size, load;
unsigned long count;
int node, images;
void *load_ptr;
int fdt_offset, fdt_len;
int data_offset, data_size;
int base_offset, align_len = ARCH_DMA_MINALIGN - 1;
int src_sector;
void *dst;
/*
* Figure out where the external images start. This is the base for the
* data-offset properties in each image.
*/
size = fdt_totalsize(fit);
size = (size + 3) & ~3;
base_offset = (size + 3) & ~3;
/*
* So far we only have one block of data from the FIT. Read the entire
* thing, including that first block, placing it so it finishes before
* where we will load the image.
*
* Note that we will load the image such that its first byte will be
* at the load address. Since that byte may be part-way through a
* block, we may load the image up to one block before the load
* address. So take account of that here by subtracting an addition
* block length from the FIT start position.
*
* In fact the FIT has its own load address, but we assume it cannot
* be before CONFIG_SYS_TEXT_BASE.
*/
fit = (void *)(CONFIG_SYS_TEXT_BASE - size - info->bl_len);
fit = (void *)ALIGN((ulong)fit, 8);
sectors = get_aligned_image_size(info, size, 0);
count = info->read(info, sector, sectors, fit);
debug("fit read sector %lx, sectors=%d, dst=%p, count=%lu\n",
sector, sectors, fit, count);
if (count == 0)
return -EIO;
/* find the firmware image to load */
images = fdt_path_offset(fit, FIT_IMAGES_PATH);
if (images < 0) {
debug("%s: Cannot find /images node: %d\n", __func__, images);
return -1;
}
node = fdt_first_subnode(fit, images);
if (node < 0) {
debug("%s: Cannot find first image node: %d\n", __func__, node);
return -1;
}
/* Get its information and set up the spl_image structure */
data_offset = fdt_getprop_u32(fit, node, "data-offset");
data_size = fdt_getprop_u32(fit, node, "data-size");
load = fdt_getprop_u32(fit, node, "load");
debug("data_offset=%x, data_size=%x\n", data_offset, data_size);
spl_image.load_addr = load;
spl_image.entry_point = load;
spl_image.os = IH_OS_U_BOOT;
/*
* Work out where to place the image. We read it so that the first
* byte will be at 'load'. This may mean we need to load it starting
* before then, since we can only read whole blocks.
*/
data_offset += base_offset;
sectors = get_aligned_image_size(info, data_size, data_offset);
load_ptr = (void *)load;
debug("U-Boot size %x, data %p\n", data_size, load_ptr);
dst = load_ptr;
/* Read the image */
src_sector = sector + get_aligned_image_offset(info, data_offset);
debug("Aligned image read: dst=%p, src_sector=%x, sectors=%x\n",
dst, src_sector, sectors);
count = info->read(info, src_sector, sectors, dst);
if (count != sectors)
return -EIO;
debug("image: dst=%p, data_offset=%x, size=%x\n", dst, data_offset,
data_size);
memcpy(dst, dst + get_aligned_image_overhead(info, data_offset),
data_size);
/* Figure out which device tree the board wants to use */
fdt_len = spl_fit_select_fdt(fit, images, &fdt_offset);
if (fdt_len < 0)
return fdt_len;
/*
* Read the device tree and place it after the image. There may be
* some extra data before it since we can only read entire blocks.
* And also align the destination address to ARCH_DMA_MINALIGN.
*/
dst = (void *)((load + data_size + align_len) & ~align_len);
fdt_offset += base_offset;
sectors = get_aligned_image_size(info, fdt_len, fdt_offset);
src_sector = sector + get_aligned_image_offset(info, fdt_offset);
count = info->read(info, src_sector, sectors, dst);
debug("Aligned fdt read: dst %p, src_sector = %x, sectors %x\n",
dst, src_sector, sectors);
if (count != sectors)
return -EIO;
/*
* Copy the device tree so that it starts immediately after the image.
* After this we will have the U-Boot image and its device tree ready
* for us to start.
*/
debug("fdt: dst=%p, data_offset=%x, size=%x\n", dst, fdt_offset,
fdt_len);
memcpy(load_ptr + data_size,
dst + get_aligned_image_overhead(info, fdt_offset), fdt_len);
return 0;
}