powerpc/82xx/km: add testpin detection for mgcoge3ne

On mgcoge3ne we also want to start the test application if the testpin
is asserted. But we don't have a full POST test support yet. So simply
add a function to read the testpin value.

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>

board/keymile/common/common.c

@@ -354,8 +354,11 @@ static int do_checktestboot(cmd_tbl_t *cmdtp, int flag, int argc,
 
 #if defined(CONFIG_POST)
 	testpin = post_hotkeys_pressed();
-	s = getenv("test_bank");
 #endif
+#if defined(CONFIG_MGCOGE3NE)
+	testpin = get_testpin();
+#endif
+	s = getenv("test_bank");
 	/* when test_bank is not set, act as if testpin is not asserted */
 	testboot = (testpin != 0) && (s);
 	if (verbose) {

board/keymile/common/common.h

@@ -134,6 +134,8 @@ int wait_for_fpga_config(void);
 int fpga_reset(void);
 int toggle_eeprom_spi_bus(void);
 
+int get_testpin(void);
+
 int set_km_env(void);
 int fdt_set_node_and_value(void *blob,
 			char *nodename,

board/keymile/km82xx/km82xx.c

@@ -473,3 +473,12 @@ int ft_board_setup(void *blob, bd_t *bd)
 	return 0;
 }
 #endif /* defined(CONFIG_OF_BOARD_SETUP) && defined(CONFIG_OF_LIBFDT) */
+
+#if defined(CONFIG_MGCOGE3NE)
+int get_testpin(void)
+{
+	/* Testpin is Port C pin 29 - enable = low */
+	int testpin = !get_pin(0x00000004, 2);
+	return testpin;
+}
+#endif