powerpc: mpc8xxx: Extend find_law() to find_law_by_addr_id()

The find_law() function searches for LAW just by physical address. This
is unsuitable for cases with overlapping LAWs. Extend it to
find_law_by_addr_id(), which searches for LAW by physical address and
target id.

Add a static inline definition of the original find_law() into fsl_law.h
header.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Mojík <marek.mojik@nic.cz>
Reviewed-by: Marek Behún <kabel@kernel.org>

arch/powerpc/cpu/mpc8xxx/law.c

@@ -130,7 +130,7 @@ int set_last_law(phys_addr_t addr, enum law_size sz, enum law_trgt_if id)
 	return idx;
 }
 
-struct law_entry find_law(phys_addr_t addr)
+struct law_entry find_law_by_addr_id(phys_addr_t addr, enum law_trgt_if id)
 {
 	struct law_entry entry;
 	int i;
@@ -146,6 +146,9 @@ struct law_entry find_law(phys_addr_t addr)
 		if (!get_law_entry(i, &entry))
 			continue;
 
+		if (id != -1 && id != entry.trgt_id)
+			continue;
+
 		upper = entry.addr + (2ull << entry.size);
 		if ((addr >= entry.addr) && (addr < upper)) {
 			entry.index = i;

arch/powerpc/include/asm/fsl_law.h

@@ -130,7 +130,13 @@ extern void set_law(u8 idx, phys_addr_t addr, enum law_size sz, enum law_trgt_if
 extern int set_next_law(phys_addr_t addr, enum law_size sz, enum law_trgt_if id);
 extern int set_last_law(phys_addr_t addr, enum law_size sz, enum law_trgt_if id);
 extern int set_ddr_laws(u64 start, u64 sz, enum law_trgt_if id);
-extern struct law_entry find_law(phys_addr_t addr);
+extern struct law_entry find_law_by_addr_id(phys_addr_t addr, enum law_trgt_if id);
+
+static inline struct law_entry find_law(phys_addr_t addr)
+{
+	return find_law_by_addr_id(addr, -1);
+}
+
 extern void disable_law(u8 idx);
 extern void init_laws(void);
 extern void print_laws(void);