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spl: Allow to load a FIT containing U-Boot from FS 

This provides a way to load a FIT containing U-Boot and a selection of device
tree files from a File system. Making sure that all the reads and writes
are aligned to their respective needs.

Tested-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
[trini: Make this still apply with Michal's alignment change for 'fit']
Signed-off-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Lokesh Vutla 2016-05-24 10:34:38 +05:30 committed by Tom Rini
parent 4d9d34a7f2
commit eafd5410af
3 changed files with 71 additions and 14 deletions
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72
common/spl/spl_fit.c
View File

@ -87,6 +87,42 @@ static int spl_fit_select_fdt(const void *fdt, int images, int *fdt_offsetp)
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;
@ -96,7 +132,7 @@ int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
void *load_ptr;
int fdt_offset, fdt_len;
int data_offset, data_size;
int base_offset;
int base_offset, align_len = ARCH_DMA_MINALIGN - 1;
int src_sector;
void *dst;
@ -124,7 +160,7 @@ int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
*/
fit = (void *)(CONFIG_SYS_TEXT_BASE - size - info->bl_len);
fit = (void *)ALIGN((ulong)fit, 8);
sectors = (size + info->bl_len - 1) / info->bl_len;
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);
@ -157,19 +193,23 @@ int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
* byte will be at 'load'. This may mean we need to load it starting
* before then, since we can only read whole blocks.
*/
sectors = (data_size + info->bl_len - 1) / info->bl_len;
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 - (data_offset % info->bl_len);
dst = load_ptr;
/* Read the image */
src_sector = sector + data_offset / info->bl_len;
debug("image: data_offset=%x, dst=%p, src_sector=%x, sectors=%x\n",
data_offset, dst, src_sector, sectors);
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);
@ -179,14 +219,15 @@ int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
/*
* 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 = load_ptr + data_size;
dst = (void *)((load + data_size + align_len) & ~align_len);
fdt_offset += base_offset;
sectors = (fdt_len + info->bl_len - 1) / info->bl_len;
count = info->read(info, sector + fdt_offset / info->bl_len, sectors,
dst);
debug("fit read %x sectors to %x, dst %p, data_offset %x\n",
sectors, spl_image.load_addr, dst, fdt_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;
@ -195,7 +236,10 @@ int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
* After this we will have the U-Boot image and its device tree ready
* for us to start.
*/
memcpy(dst, dst + fdt_offset % info->bl_len, fdt_len);
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;
}

1
common/spl/spl_mmc.c
View File

@ -77,6 +77,7 @@ static int mmc_load_image_raw_sector(struct mmc *mmc, unsigned long sector)
debug("Found FIT\n");
load.dev = mmc;
load.priv = NULL;
load.filename = NULL;
load.bl_len = mmc->read_bl_len;
load.read = h_spl_load_read;
ret = spl_load_simple_fit(&load, sector, header);

12
include/spl.h
View File

@ -35,16 +35,28 @@ struct spl_image_info {
* @dev: Pointer to the device, e.g. struct mmc *
* @priv: Private data for the device
* @bl_len: Block length for reading in bytes
* @filename: Name of the fit image file.
* @read: Function to call to read from the device
*/
struct spl_load_info {
void *dev;
void *priv;
int bl_len;
const char *filename;
ulong (*read)(struct spl_load_info *load, ulong sector, ulong count,
void *buf);
};
/**
* spl_load_simple_fit() - Loads a fit image from a device.
* @info: Structure containing the information required to load data.
* @sector: Sector number where FIT image is located in the device
* @fdt: Pointer to the copied FIT header.
*
* Reads the FIT image @sector in the device. Loads u-boot image to
* specified load address and copies the dtb to end of u-boot image.
* Returns 0 on success.
*/
int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fdt);
#define SPL_COPY_PAYLOAD_ONLY 1