ARM: add infra-structure for BCM2835 and Raspberry Pi

The BCM2835 is an ARM SoC from Broadcom. This patch adds very basic
support for this SoC.

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

Note that the documentation in the latter .pdf assumes the MMU setup
that's used on the "VideoCore" companion processor, and does not document
physical peripheral addresses. Subtract 0x5e000000 to obtain the physical
addresses. This is accounted for by the ranges property in the /soc node
in the device tree.

The BCM2835 SoC is used in the Raspberry Pi. This patch also adds a
minimal device tree for this board; enough to see some very early kernel
boot messages through earlyprintk. However, this patch does not yet
provide a useful booting system.

http://www.raspberrypi.org/.

This patch was extracted from git://github.com/lp0/linux.git branch
rpi-split from 3-4 months ago, and significantly stripped down and
modified since.

Signed-off-by: Chris Boot <bootc@bootc.net>
Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Dom Cobley <popcornmix@gmail.com>
Signed-off-by: Dom Cobley <dc4@broadcom.com>
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 17 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 2f88d8d97701..6524497609fa 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -350,6 +350,23 @@ config ARCH_AT91
           This enables support for systems based on Atmel
           AT91RM9200 and AT91SAM9* processors.
 
+config ARCH_BCM2835
+        bool "Broadcom BCM2835 family"
+        select ARCH_WANT_OPTIONAL_GPIOLIB
+        select ARM_AMBA
+        select ARM_ERRATA_411920
+        select ARM_TIMER_SP804
+        select CLKDEV_LOOKUP
+        select COMMON_CLK
+        select CPU_V6
+        select GENERIC_CLOCKEVENTS
+        select MULTI_IRQ_HANDLER
+        select SPARSE_IRQ
+        select USE_OF
+        help
+          This enables support for the Broadcom BCM2835 SoC. This SoC is
+          use in the Raspberry Pi, and Roku 2 devices.
+
 config ARCH_BCMRING
         bool "Broadcom BCMRING"
         depends on MMU