xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ARM: add infra-structure for BCM2835 and Raspberry Pi

Browse Source 
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>
This commit is contained in:
Simon Arlott
2012-05-26 01:04:43 -06:00
committed by Stephen Warren
parent 55d512e245
commit ec9653b847
14 changed files with 355 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

77
arch/arm/mach-bcm2835/bcm2835.c Normal file
View File

@@ -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 <linux/init.h>
#include <linux/of_platform.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/time.h>
#include <asm/exception.h>
#include <mach/bcm2835_soc.h>
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