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| author |   Simon Arlott <simon@fire.lp0.eu> | 2012-09-10 22:38:35 -0600 |
|---|---|---|
| committer |   Stephen Warren <swarren@wwwdotorg.org> | 2012-09-19 19:08:46 -0600 |
| commit | ee4af5696720bb5b9de2e3b18be42089bed1e638 (patch) | |
| tree | dae604e551100648c6bf42a9b4de6a9ca2cd34b7 /arch | |
| parent | ARM: bcm2835: add interrupt controller driver (diff) | |
| download | linux-dev-ee4af5696720bb5b9de2e3b18be42089bed1e638.tar.xz linux-dev-ee4af5696720bb5b9de2e3b18be42089bed1e638.zip | |
ARM: bcm2835: add system timer
The System Timer peripheral provides four 32-bit timer channels and a
single 64-bit free running counter. Each channel has an output compare
register, which is compared against the 32 least significant bits of the
free running counter values, and generates an interrupt.
Timer 3 is used as the Linux timer.
The BCM2835 also contains an SP804-based timer module. However, it
apparently has significant differences from the standard SP804 IP block,
and Broadcom's documentation recommends using the system timer instead.
This patch was extracted from git://github.com/lp0/linux.git branch
rpi-split as of 2012/09/08, and modified as follows:
* s/bcm2708/bcm2835/.
* Modified device tree vendor prefix.
* Moved to drivers/clocksource/. This looks like the desired location for
such code now.
* Added DT binding docs.
* Moved struct sys_timer bcm2835_timer into time.c to encapsulate it more.
* Simplified bcm2835_time_init() to find one matching node and operate on
it, rather than looping over all matching nodes. This seems more
consistent with other clocksource code.
* Simplified bcm2835_time_init() using of_iomap().
* Renamed struct bcm2835_timer.index to match_mask to better represent its
purpose.
* s/printk(PR_INFO/pr_info(/
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/boot/dts/bcm2835.dtsi | 7 | ||||
| -rw-r--r-- | arch/arm/mach-bcm2835/bcm2835.c | 10 |
2 files changed, 8 insertions, 9 deletions
diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi index 8842d751d7dd..e7471d271e0f 100644 --- a/arch/arm/boot/dts/bcm2835.dtsi +++ b/arch/arm/boot/dts/bcm2835.dtsi @@ -15,6 +15,13 @@ #size-cells = <1>; ranges = <0x7e000000 0x20000000 0x02000000>; + timer { + compatible = "brcm,bcm2835-system-timer"; + reg = <0x7e003000 0x1000>; + interrupts = <1 0>, <1 1>, <1 2>, <1 3>; + clock-frequency = <1000000>; + }; + intc: interrupt-controller { compatible = "brcm,bcm2835-armctrl-ic"; reg = <0x7e00b200 0x200>; diff --git a/arch/arm/mach-bcm2835/bcm2835.c b/arch/arm/mach-bcm2835/bcm2835.c index 72c4b5ff8f90..e3f296860dd0 100644 --- a/arch/arm/mach-bcm2835/bcm2835.c +++ b/arch/arm/mach-bcm2835/bcm2835.c @@ -15,10 +15,10 @@ #include <linux/init.h> #include <linux/irqchip/bcm2835.h> #include <linux/of_platform.h> +#include <linux/bcm2835_timer.h> #include <asm/mach/arch.h> #include <asm/mach/map.h> -#include <asm/mach/time.h> #include <mach/bcm2835_soc.h> @@ -46,14 +46,6 @@ void __init bcm2835_init(void) } } -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 |