Commit ec9653b8 authored by Simon Arlott's avatar Simon Arlott Committed by Stephen Warren
Browse files

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: default avatarChris Boot <bootc@bootc.net>
Signed-off-by: default avatarSimon Arlott <simon@fire.lp0.eu>
Signed-off-by: default avatarDom Cobley <popcornmix@gmail.com>
Signed-off-by: default avatarDom Cobley <dc4@broadcom.com>
Signed-off-by: default avatarStephen Warren <swarren@wwwdotorg.org>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 55d512e2

Documentation/devicetree/bindings/arm/bcm2835.txt

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Broadcom BCM2835 device tree bindings

-------------------------------------------



Boards with the BCM2835 SoC shall have the following properties:



Required root node property:



compatible = "brcm,bcm2835";

Documentation/devicetree/bindings/vendor-prefixes.txt

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ apm Applied Micro Circuits Corporation (APM) 
arm	ARM Ltd.

atmel	Atmel Corporation

bosch	Bosch Sensortec GmbH

brcm	Broadcom Corporation

cavium	Cavium, Inc.

chrp	Common Hardware Reference Platform

cortina	Cortina Systems, Inc.

arch/arm/Kconfig

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@@ -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

arch/arm/Makefile

+1 −0
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@@ -136,6 +136,7 @@ textofs-$(CONFIG_ARCH_MSM8960) := 0x00208000 
# Machine directory name.  This list is sorted alphanumerically

# by CONFIG_* macro name.

machine-$(CONFIG_ARCH_AT91)		:= at91

machine-$(CONFIG_ARCH_BCM2835)		:= bcm2835

machine-$(CONFIG_ARCH_BCMRING)		:= bcmring

machine-$(CONFIG_ARCH_CLPS711X)		:= clps711x

machine-$(CONFIG_ARCH_CNS3XXX)		:= cns3xxx

arch/arm/boot/dts/bcm2835-rpi-b.dts

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/dts-v1/;

/memreserve/ 0x0c000000 0x04000000;

/include/ "bcm2835.dtsi"



/ {

	compatible = "raspberrypi,model-b", "brcm,bcm2835";

	model = "Raspberry Pi Model B";



	memory {

		reg = <0 0x10000000>;

	};

};

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