[U-Boot] [PATCH] tegra: add enterrcm command

[Stephen Warren]

From: Stephen Warren <swarren at nvidia.com>

Tegra's boot ROM supports a mode whereby code may be downloaded and flash
programmed over a USB connection. On dev boards, this is typically entered
by holding down a "force recovery" button and resetting the CPU. However,
not all boards have such a button (one example is the Compulab Trimslice),
so a method to enter RCM from software is useful.

This change implements the command "enterrcm" to do this, and enables it
for all Tegra boards by default. Even on boards other than Trimslice,
controlling this over a UART may be useful, e.g. to allow simple remote
control without the need for mechanical button actuators, or hooking up
relays/... to the button.

Signed-off-by: Stephen Warren <swarren at nvidia.com>
---
 arch/arm/cpu/armv7/tegra2/Makefile       |    1 +
 arch/arm/cpu/armv7/tegra2/cmd_enterrcm.c |   65 ++++++++++++++++++++++++++++++
 include/configs/tegra2-common.h          |    1 +
 3 files changed, 67 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/cpu/armv7/tegra2/cmd_enterrcm.c

diff --git a/arch/arm/cpu/armv7/tegra2/Makefile b/arch/arm/cpu/armv7/tegra2/Makefile
index 08c4137..80da453 100644
--- a/arch/arm/cpu/armv7/tegra2/Makefile
+++ b/arch/arm/cpu/armv7/tegra2/Makefile
@@ -39,6 +39,7 @@ COBJS-$(CONFIG_TEGRA_CLOCK_SCALING) += emc.o
 COBJS-$(CONFIG_TEGRA_PMU) += pmu.o
 COBJS-$(CONFIG_USB_EHCI_TEGRA) += usb.o
 COBJS-$(CONFIG_TEGRA2_LP0) += crypto.o warmboot.o warmboot_avp.o
+COBJS-$(CONFIG_CMD_ENTERRCM) += cmd_enterrcm.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
diff --git a/arch/arm/cpu/armv7/tegra2/cmd_enterrcm.c b/arch/arm/cpu/armv7/tegra2/cmd_enterrcm.c
new file mode 100644
index 0000000..2fcd107
--- /dev/null
+++ b/arch/arm/cpu/armv7/tegra2/cmd_enterrcm.c
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Derived from code (arch/arm/lib/reset.c) that is:
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger at sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu at sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <garyj at denx.de>
+ *
+ * (C) Copyright 2004
+ * DAVE Srl
+ * http://www.dave-tech.it
+ * http://www.wawnet.biz
+ * mailto:info at wawnet.biz
+ *
+ * (C) Copyright 2004 Texas Insturments
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <common.h>
+#include <asm/arch/tegra2.h>
+#include <asm/arch/pmc.h>
+
+static int do_enterrcm(cmd_tbl_t *cmdtp, int flag, int argc,
+		       char * const argv[])
+{
+	struct pmc_ctlr *pmc = (struct pmc_ctlr *)TEGRA2_PMC_BASE;
+
+	puts("Entering RCM...\n");
+	udelay(50000);
+
+	pmc->pmc_scratch0 = 2;
+	disable_interrupts();
+	reset_cpu(0);
+
+	return 0;
+}
+
+U_BOOT_CMD(
+	enterrcm, 1, 0, do_enterrcm,
+	"reset Tegra and enter USB Recovery Mode",
+	""
+);
diff --git a/include/configs/tegra2-common.h b/include/configs/tegra2-common.h
index b11461c..8393901 100644
--- a/include/configs/tegra2-common.h
+++ b/include/configs/tegra2-common.h
@@ -194,4 +194,5 @@
 
 #define CONFIG_TEGRA_GPIO
 #define CONFIG_CMD_GPIO
+#define CONFIG_CMD_ENTERRCM
 #endif /* __TEGRA2_COMMON_H */
-- 
1.7.0.4