From ec9653b8476bf526dde7bdefbc2be6b7aaa34db7 Mon Sep 17 00:00:00 2001 From: Simon Arlott Date: Sat, 26 May 2012 01:04:43 -0600 Subject: 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 Signed-off-by: Simon Arlott Signed-off-by: Dom Cobley Signed-off-by: Dom Cobley Signed-off-by: Stephen Warren Acked-by: Arnd Bergmann --- arch/arm/mach-bcm2835/bcm2835.c | 77 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 arch/arm/mach-bcm2835/bcm2835.c (limited to 'arch/arm/mach-bcm2835/bcm2835.c') diff --git a/arch/arm/mach-bcm2835/bcm2835.c b/arch/arm/mach-bcm2835/bcm2835.c new file mode 100644 index 00000000000..f6b36b4b592 --- /dev/null +++ b/arch/arm/mach-bcm2835/bcm2835.c @@ -0,0 +1,77 @@ +/* + * Copyright (C) 2010 Broadcom + * + * 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. + */ + +#include +#include + +#include +#include +#include +#include + +#include + +static struct map_desc io_map __initdata = { + .virtual = BCM2835_PERIPH_VIRT, + .pfn = __phys_to_pfn(BCM2835_PERIPH_PHYS), + .length = BCM2835_PERIPH_SIZE, + .type = MT_DEVICE +}; + +void __init bcm2835_map_io(void) +{ + iotable_init(&io_map, 1); +} + +void __init bcm2835_init_irq(void) +{ +} + +asmlinkage void __exception_irq_entry bcm2835_handle_irq(struct pt_regs *regs) +{ +} + +void __init bcm2835_init(void) +{ + int ret; + + ret = of_platform_populate(NULL, of_default_bus_match_table, NULL, + NULL); + if (ret) { + pr_err("of_platform_populate failed: %d\n", ret); + BUG(); + } +} + +static void __init bcm2835_timer_init(void) +{ +} + +struct sys_timer bcm2835_timer = { + .init = bcm2835_timer_init +}; + +static const char * const bcm2835_compat[] = { + "brcm,bcm2835", + NULL +}; + +DT_MACHINE_START(BCM2835, "BCM2835") + .map_io = bcm2835_map_io, + .init_irq = bcm2835_init_irq, + .handle_irq = bcm2835_handle_irq, + .init_machine = bcm2835_init, + .timer = &bcm2835_timer, + .dt_compat = bcm2835_compat +MACHINE_END -- cgit v1.2.3