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>

3 files changed, 139 insertions, 0 deletions

diff --git a/arch/arm/include/asm/arch-bcm2835/gpio.h b/arch/arm/include/asm/arch-bcm2835/gpio.h
new file mode 100644
index 0000000..0e70856
--- /dev/null
+++ b/arch/arm/include/asm/arch-bcm2835/gpio.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2012 Vikram Narayananan
+ * <vikram186@gmail.com>
+ *
+ * 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.
+ */
+
+#ifndef _BCM2835_GPIO_H_
+#define _BCM2835_GPIO_H_
+
+#define BCM2835_GPIO_BASE		0x20200000
+#define BCM2835_GPIO_COUNT		54
+
+#define BCM2835_GPIO_FSEL_MASK		0x7
+#define BCM2835_GPIO_INPUT		0x0
+#define BCM2835_GPIO_OUTPUT		0x1
+#define BCM2835_GPIO_ALT0		0x4
+#define BCM2835_GPIO_ALT1		0x5
+#define BCM2835_GPIO_ALT2		0x6
+#define BCM2835_GPIO_ALT3		0x7
+#define BCM2835_GPIO_ALT4		0x3
+#define BCM2835_GPIO_ALT5		0x2
+
+#define BCM2835_GPIO_COMMON_BANK(gpio)	((gpio < 32) ? 0 : 1)
+#define BCM2835_GPIO_COMMON_SHIFT(gpio)	(gpio & 0x1f)
+
+#define BCM2835_GPIO_FSEL_BANK(gpio)	(gpio / 10)
+#define BCM2835_GPIO_FSEL_SHIFT(gpio)	((gpio % 10) * 3)
+
+struct bcm2835_gpio_regs {
+	u32 gpfsel[6];
+	u32 reserved1;
+	u32 gpset[2];
+	u32 reserved2;
+	u32 gpclr[2];
+	u32 reserved3;
+	u32 gplev[2];
+	u32 reserved4;
+	u32 gpeds[2];
+	u32 reserved5;
+	u32 gpren[2];
+	u32 reserved6;
+	u32 gpfen[2];
+	u32 reserved7;
+	u32 gphen[2];
+	u32 reserved8;
+	u32 gplen[2];
+	u32 reserved9;
+	u32 gparen[2];
+	u32 reserved10;
+	u32 gppud;
+	u32 gppudclk[2];
+};
+
+#endif /* _BCM2835_GPIO_H_ */
diff --git a/arch/arm/include/asm/arch-bcm2835/timer.h b/arch/arm/include/asm/arch-bcm2835/timer.h
new file mode 100644
index 0000000..30c70e0
--- /dev/null
+++ b/arch/arm/include/asm/arch-bcm2835/timer.h
@@ -0,0 +1,37 @@
+/*
+ * (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.
+ */
+
+#ifndef _BCM2835_TIMER_H
+#define _BCM2835_TIMER_H
+
+#define BCM2835_TIMER_PHYSADDR	0x20003000
+
+struct bcm2835_timer_regs {
+	u32 cs;
+	u32 clo;
+	u32 chi;
+	u32 c0;
+	u32 c1;
+	u32 c2;
+	u32 c3;
+};
+
+#define BCM2835_TIMER_CS_M3	(1 << 3)
+#define BCM2835_TIMER_CS_M2	(1 << 2)
+#define BCM2835_TIMER_CS_M1	(1 << 1)
+#define BCM2835_TIMER_CS_M0	(1 << 0)
+
+#endif
diff --git a/arch/arm/include/asm/arch-bcm2835/wdog.h b/arch/arm/include/asm/arch-bcm2835/wdog.h
new file mode 100644
index 0000000..303a65f
--- /dev/null
+++ b/arch/arm/include/asm/arch-bcm2835/wdog.h
@@ -0,0 +1,36 @@
+/*
+ * (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.
+ */
+
+#ifndef _BCM2835_TIMER_H
+#define _BCM2835_TIMER_H
+
+#define BCM2835_WDOG_PHYSADDR			0x20100000
+
+struct bcm2835_wdog_regs {
+	u32 unknown0[7];
+	u32 rstc;
+	u32 unknown1;
+	u32 wdog;
+};
+
+#define BCM2835_WDOG_PASSWORD			0x5a000000
+
+#define BCM2835_WDOG_RSTC_WRCFG_MASK		0x00000030
+#define BCM2835_WDOG_RSTC_WRCFG_FULL_RESET	0x00000020
+
+#define BCM2835_WDOG_WDOG_TIMEOUT_MASK		0x0000ffff
+
+#endif