efi/arm: Move FDT param discovery code out of efi.c

On ARM systems, we discover the UEFI system table address and memory
map address from the /chosen node in the device tree, or in the Xen
case, from a similar node under /hypervisor.

Before making some functional changes to that code, move it into its
own file that only gets built if CONFIG_EFI_PARAMS_FROM_FDT=y.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

1 files changed, 0 insertions, 135 deletions

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 718dddfa0a0b..7dbe1487b111 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -20,7 +20,6 @@
 #include <linux/device.h>
 #include <linux/efi.h>
 #include <linux/of.h>
-#include <linux/of_fdt.h>
 #include <linux/io.h>
 #include <linux/kexec.h>
 #include <linux/platform_device.h>
@@ -646,140 +645,6 @@ static int __init efi_load_efivars(void)
 device_initcall(efi_load_efivars);
 #endif
 
-#ifdef CONFIG_EFI_PARAMS_FROM_FDT
-
-#define UEFI_PARAM(name, prop, field)			   \
-	{						   \
-		{ name },				   \
-		{ prop },				   \
-		offsetof(struct efi_fdt_params, field),    \
-		sizeof_field(struct efi_fdt_params, field) \
-	}
-
-struct params {
-	const char name[32];
-	const char propname[32];
-	int offset;
-	int size;
-};
-
-static __initdata struct params fdt_params[] = {
-	UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
-	UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
-	UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
-	UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size),
-	UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
-};
-
-static __initdata struct params xen_fdt_params[] = {
-	UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
-	UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
-	UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
-	UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
-	UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
-};
-
-#define EFI_FDT_PARAMS_SIZE	ARRAY_SIZE(fdt_params)
-
-static __initdata struct {
-	const char *uname;
-	const char *subnode;
-	struct params *params;
-} dt_params[] = {
-	{ "hypervisor", "uefi", xen_fdt_params },
-	{ "chosen", NULL, fdt_params },
-};
-
-struct param_info {
-	int found;
-	void *params;
-	const char *missing;
-};
-
-static int __init __find_uefi_params(unsigned long node,
-				     struct param_info *info,
-				     struct params *params)
-{
-	const void *prop;
-	void *dest;
-	u64 val;
-	int i, len;
-
-	for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) {
-		prop = of_get_flat_dt_prop(node, params[i].propname, &len);
-		if (!prop) {
-			info->missing = params[i].name;
-			return 0;
-		}
-
-		dest = info->params + params[i].offset;
-		info->found++;
-
-		val = of_read_number(prop, len / sizeof(u32));
-
-		if (params[i].size == sizeof(u32))
-			*(u32 *)dest = val;
-		else
-			*(u64 *)dest = val;
-
-		if (efi_enabled(EFI_DBG))
-			pr_info("  %s: 0x%0*llx\n", params[i].name,
-				params[i].size * 2, val);
-	}
-
-	return 1;
-}
-
-static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
-				       int depth, void *data)
-{
-	struct param_info *info = data;
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
-		const char *subnode = dt_params[i].subnode;
-
-		if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) {
-			info->missing = dt_params[i].params[0].name;
-			continue;
-		}
-
-		if (subnode) {
-			int err = of_get_flat_dt_subnode_by_name(node, subnode);
-
-			if (err < 0)
-				return 0;
-
-			node = err;
-		}
-
-		return __find_uefi_params(node, info, dt_params[i].params);
-	}
-
-	return 0;
-}
-
-int __init efi_get_fdt_params(struct efi_fdt_params *params)
-{
-	struct param_info info;
-	int ret;
-
-	pr_info("Getting EFI parameters from FDT:\n");
-
-	info.found = 0;
-	info.params = params;
-
-	ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
-	if (!info.found)
-		pr_info("UEFI not found.\n");
-	else if (!ret)
-		pr_err("Can't find '%s' in device tree!\n",
-		       info.missing);
-
-	return ret;
-}
-#endif /* CONFIG_EFI_PARAMS_FROM_FDT */
-
 static __initdata char memory_type_name[][20] = {
 	"Reserved",
 	"Loader Code",