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apple: Set up file system firmware loader

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Find the appropriate EFI system partition on the internal NVMe
storage and set the U-Boot environment variables such that
the file system firmware loader can load firmware from it.

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
This commit is contained in:
Mark Kettenis 2023-05-02 20:14:20 +02:00
parent a2f58b6a73
commit 2c3fdbaf8f
1 changed files with 60 additions and 0 deletions
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60
arch/arm/mach-apple/board.c
View file

@ -8,6 +8,8 @@
#include <dm/uclass-internal.h>
#include <efi_loader.h>
#include <lmb.h>
#include <nvme.h>
#include <part.h>
#include <asm/armv8/mmu.h>
#include <asm/global_data.h>
@ -770,6 +772,60 @@ u64 get_page_table_size(void)
return SZ_256K;
}
static char *asahi_esp_devpart(void)
{
struct disk_partition info;
struct blk_desc *nvme_blk;
const char *uuid = NULL;
int devnum, len, p, part, ret;
static char devpart[64];
struct udevice *dev;
ofnode node;
if (devpart[0])
return devpart;
node = ofnode_path("/chosen");
if (ofnode_valid(node)) {
uuid = ofnode_get_property(node, "asahi,efi-system-partition",
&len);
}
nvme_scan_namespace();
for (devnum = 0, part = 0;; devnum++) {
nvme_blk = blk_get_devnum_by_uclass_id(UCLASS_NVME, devnum);
if (nvme_blk == NULL)
break;
dev = dev_get_parent(nvme_blk->bdev);
if (!device_is_compatible(dev, "apple,nvme-ans2"))
continue;
for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
ret = part_get_info(nvme_blk, p, &info);
if (ret < 0)
break;
if (info.bootable & PART_EFI_SYSTEM_PARTITION) {
if (uuid && strcasecmp(uuid, info.uuid) == 0) {
part = p;
break;
}
if (part == 0)
part = p;
}
}
if (part > 0)
break;
}
if (part > 0)
snprintf(devpart, sizeof(devpart), "%x:%x", devnum, part);
return devpart;
}
#define KERNEL_COMP_SIZE SZ_128M
int board_late_init(void)
@ -777,6 +833,10 @@ int board_late_init(void)
struct lmb lmb;
u32 status = 0;
status |= env_set("storage_interface",
blk_get_uclass_name(UCLASS_NVME));
status |= env_set("fw_dev_part", asahi_esp_devpart());
lmb_init_and_reserve(&lmb, gd->bd, (void *)gd->fdt_blob);
/* somewhat based on the Linux Kernel boot requirements: