cmd: fuse: Add a command to read fuses to memory

With the fuse values in memory we can use some of the other u-boot shell
conditonal operators to do tests.
Signed-off-by: Angus Ainslie (Purism) <angus@akkea.ca>

cmd/fuse.c

@@ -12,6 +12,7 @@
 #include <command.h>
 #include <console.h>
 #include <fuse.h>
+#include <mapmem.h>
 #include <linux/errno.h>
 
 static int strtou32(const char *str, unsigned int base, u32 *result)
@@ -45,6 +46,8 @@ static int do_fuse(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 	const char *op = argc >= 2 ? argv[1] : NULL;
 	int confirmed = argc >= 3 && !strcmp(argv[2], "-y");
 	u32 bank, word, cnt, val, cmp;
+	ulong addr;
+	void *buf, *start;
 	int ret, i;
 
 	argc -= 2 + confirmed;
@@ -72,6 +75,28 @@ static int do_fuse(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 			printf(" %.8x", val);
 		}
 		putc('\n');
+	} else if (!strcmp(op, "readm")) {
+		if (argc == 3)
+			cnt = 1;
+		else if (argc != 4 || strtou32(argv[3], 0, &cnt))
+			return CMD_RET_USAGE;
+
+		addr = simple_strtoul(argv[2], NULL, 16);
+
+		start = map_sysmem(addr, 4);
+		buf = start;
+
+		printf("Reading bank %u len %u to 0x%lx\n", bank, cnt, addr);
+		for (i = 0; i < cnt; i++, word++) {
+			ret = fuse_read(bank, word, &val);
+			if (ret)
+				goto err;
+
+			*((u32 *)buf) = val;
+			buf += 4;
+		}
+
+		unmap_sysmem(start);
 	} else if (!strcmp(op, "cmp")) {
 		if (argc != 3 || strtou32(argv[2], 0, &cmp))
 			return CMD_RET_USAGE;
@@ -156,6 +181,8 @@ U_BOOT_CMD(
 	"    starting at 'word'\n"
 	"fuse cmp <bank> <word> <hexval> - compare 'hexval' to fuse\n"
 	"    at 'word'\n"
+	"fuse readm <bank> <word> <addr> [<cnt>] - read 1 or 'cnt' fuse words,\n"
+	"    starting at 'word' into memory at 'addr'\n"
 	"fuse sense <bank> <word> [<cnt>] - sense 1 or 'cnt' fuse words,\n"
 	"    starting at 'word'\n"
 	"fuse prog [-y] <bank> <word> <hexval> [<hexval>...] - program 1 or\n"