tegra124: enable JTAG in Security Mode

Once SECURITY_MODE fuse is burned, JTAG is disabled by default.
To reenable JTAG, besides chip unique id and SecureJtagControl need
to be built into BCT, Jtag enable flag is also needed to be set.

BUG=None
TEST=Burn SECURITY_MODE fuse, build chip specific BCT, coreboot
     comes up and jtag hooks up fine.

Original-Change-Id: Ic6b61be2c09b15541400f9766d486a4fcef192a8
Original-Signed-off-by: Jimmy Zhang <jimmzhang@nvidia.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/186031
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
(cherry picked from commit ff962b81f424c840ef171d4287a65ab79b018a28)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: I14b496932dbc0ed184a2212a5b33d740e1f34a4e
Reviewed-on: http://review.coreboot.org/7403
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

src/soc/nvidia/tegra/apbmisc.c

@@ -0,0 +1,29 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <soc/addressmap.h>
+
+#include "apbmisc.h"
+
+void enable_jtag(void)
+{
+	struct apbmisc *misc = (struct apbmisc *)TEGRA_APB_MISC_BASE;
+	write32(PP_CONFIG_CTL_JTAG, &misc->pp_config_ctl);
+}

src/soc/nvidia/tegra/apbmisc.h

@@ -0,0 +1,35 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __SOC_NVIDIA_TEGRA_APBMISC_H__
+#define __SOC_NVIDIA_TEGRA_APBMISC_H__
+
+#include <stdint.h>
+
+struct apbmisc {
+	u32 reserved0[9];		/* ABP_MISC_PP_ offsets 00-20 */
+	u32 pp_config_ctl;		/* _CONFIG_CTL_0, offset 24 */
+};
+
+#define PP_CONFIG_CTL_TBE		(1 << 7)
+#define PP_CONFIG_CTL_JTAG		(1 << 6)
+
+void enable_jtag(void);
+
+#endif	/* __SOC_NVIDIA_TEGRA_APBMISC_H__ */

src/soc/nvidia/tegra124/Makefile.inc

@@ -13,6 +13,7 @@ bootblock-y += ../tegra/gpio.c
 bootblock-y += ../tegra/i2c.c
 bootblock-y += ../tegra/pingroup.c
 bootblock-y += ../tegra/pinmux.c
+bootblock-y += ../tegra/apbmisc.c
 bootblock-y += timer.c
 ifeq ($(CONFIG_BOOTBLOCK_CONSOLE),y)
 bootblock-$(CONFIG_CONSOLE_SERIAL) += uart.c

src/soc/nvidia/tegra124/bootblock.c

@@ -23,6 +23,7 @@
 #include <cbfs.h>
 #include <console/console.h>
 #include <soc/clock.h>
+#include <soc/nvidia/tegra/apbmisc.h>
 
 #include "pinmux.h"
 #include "power.h"
@@ -31,6 +32,9 @@ void main(void)
 {
 	void *entry;
 
+	// enable JTAG at the earliest stage
+	enable_jtag();
+
 	clock_early_uart();
 
 	// Serial out, tristate off.