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spl: Add a way to declare an SPL image loader

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Add a linker list macro which can be used to declare an SPL image loader.
Update spl_load_image() to search available loaders for the correct one.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Simon Glass 2016-09-24 18:19:58 -06:00 committed by Tom Rini
parent ecdfd69a4b
commit a0a8029058
2 changed files with 52 additions and 0 deletions
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20
common/spl/spl.c
View File

@ -347,12 +347,32 @@ static void announce_boot_device(u32 boot_device)
static inline void announce_boot_device(u32 boot_device) { }
#endif
static struct spl_image_loader *spl_ll_find_loader(uint boot_device)
{
struct spl_image_loader *drv =
ll_entry_start(struct spl_image_loader, spl_image_loader);
const int n_ents =
ll_entry_count(struct spl_image_loader, spl_image_loader);
struct spl_image_loader *entry;
for (entry = drv; entry != drv + n_ents; entry++) {
if (boot_device == entry->boot_device)
return entry;
}
/* Not found */
return NULL;
}
static int spl_load_image(u32 boot_device)
{
struct spl_boot_device bootdev;
struct spl_image_loader *loader = spl_ll_find_loader(boot_device);
bootdev.boot_device = boot_device;
bootdev.boot_device_name = NULL;
if (loader)
return loader->load_image(&bootdev);
switch (boot_device) {
#ifdef CONFIG_SPL_RAM_DEVICE

32
include/spl.h
View File

@ -149,6 +149,38 @@ struct spl_boot_device {
const char *boot_device_name;
};
/**
* Holds information about a way of loading an SPL image
*
* @boot_device: Boot device that this loader supports
* @load_image: Function to call to load image
*/
struct spl_image_loader {
uint boot_device;
/**
* load_image() - Load an SPL image
*
* @bootdev: describes the boot device to load from
*/
int (*load_image)(struct spl_boot_device *bootdev);
};
/* Declare an SPL image loader */
#define SPL_LOAD_IMAGE(__name) \
ll_entry_declare(struct spl_image_loader, __name, spl_image_loader)
/*
* __priority is the priority of this method, 0 meaning it will be the top
* choice for this device, 9 meaning it is the bottom choice.
* __boot_device is the BOOT_DEVICE_... value
* __method is the load_image function to call
*/
#define SPL_LOAD_IMAGE_METHOD(__priority, __boot_device, __method) \
SPL_LOAD_IMAGE(__method ## __priority ## __boot_device) = { \
.boot_device = __boot_device, \
.load_image = __method, \
}
/* NAND SPL functions */
int spl_nand_load_image(struct spl_boot_device *bootdev);