ARM: add basic support for the Broadcom BCM2835 SoC

This SoC is used in the Raspberry Pi, for example.

For more details, see:
http://www.broadcom.com/products/BCM2835
http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf.

Initial support is enough to boot to a serial console, execute a minimal
set of U-Boot commands, download data over a serial port, and boot a
Linux kernel. No storage or network drivers are implemented.

GPIO driver originally by Vikram Narayanan <vikram186@gmail.com>
with many fixes from myself.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/arch/arm/cpu/arm1176/bcm2835/reset.c b/arch/arm/cpu/arm1176/bcm2835/reset.c
new file mode 100644
index 0000000..8c37ad9
--- /dev/null
+++ b/arch/arm/cpu/arm1176/bcm2835/reset.c
@@ -0,0 +1,35 @@
+/*
+ * (C) Copyright 2012 Stephen Warren
+ *
+ * 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
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/wdog.h>
+
+#define RESET_TIMEOUT 10
+
+void reset_cpu(ulong addr)
+{
+	struct bcm2835_wdog_regs *regs =
+		(struct bcm2835_wdog_regs *)BCM2835_WDOG_PHYSADDR;
+	uint32_t rstc;
+
+	rstc = readl(&regs->rstc);
+	rstc &= ~BCM2835_WDOG_RSTC_WRCFG_MASK;
+	rstc |= BCM2835_WDOG_RSTC_WRCFG_FULL_RESET;
+
+	writel(BCM2835_WDOG_PASSWORD | RESET_TIMEOUT, &regs->wdog);
+	writel(BCM2835_WDOG_PASSWORD | rstc, &regs->rstc);
+}