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| author | Robert Jarzmik <robert.jarzmik@free.fr> | 2014-12-27 14:55:25 +0100 |
|---|---|---|
| committer | Robert Jarzmik <robert.jarzmik@free.fr> | 2015-05-12 23:26:25 +0200 |
| commit | 5e1d01285140a8cd90676ba15c06c8ec700fd618 (patch) | |
| tree | f53b7417a15585ce99b0694b495a3a7f0bb1eb42 /arch/arm/mach-pxa | |
| parent | b787f68c36d49bb1d9236f403813641efa74a031 (diff) | |
| download | linux-5e1d01285140a8cd90676ba15c06c8ec700fd618.tar.bz2 | |
ARM: pxa: change clocks init sequence
Since pxa clocks were ported to the clock framework, an ordering issue
appears between clocks and clocksource initialization. As a consequence,
the pxa timer clock cannot be acquired in pxa_timer, and is disabled by
clock framework because it is "unused".
The ordering issue is that in the kernel boot sequence :
start_kernel()
...
time_init()
-> pxa_timer()
-> here the clocksource is initialized
...
rest_init()
kernel_init()
initcalls
-> here the clocks are initialized
In the current sequence, the clocks are initialized way after pxa_timer,
which cannot acquire the OSTIMER0 clock.
To solve this issue, the clocks initialization is moved to pxa_timer(),
so that clocks are initialized before clocksource for non device-tree.
For device-tree, the standard arm time_init() will take care of the
ordering.
Reviewed-by: Michael Turquette <mturquette@linaro.org>
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Diffstat (limited to 'arch/arm/mach-pxa')
| -rw-r--r-- | arch/arm/mach-pxa/generic.c | 4 | ||||
| -rw-r--r-- | arch/arm/mach-pxa/generic.h | 2 |
2 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/generic.c b/arch/arm/mach-pxa/generic.c index 04b013fbc98f..d988c5314089 100644 --- a/arch/arm/mach-pxa/generic.c +++ b/arch/arm/mach-pxa/generic.c @@ -63,6 +63,10 @@ EXPORT_SYMBOL(get_clock_tick_rate); */ void __init pxa_timer_init(void) { + if (cpu_is_pxa25x()) + pxa25x_clocks_init(); + if (cpu_is_pxa27x()) + pxa27x_clocks_init(); pxa_timer_nodt_init(IRQ_OST0, io_p2v(0x40a00000), get_clock_tick_rate()); } diff --git a/arch/arm/mach-pxa/generic.h b/arch/arm/mach-pxa/generic.h index 7a9fa1aa4e41..149087c7302a 100644 --- a/arch/arm/mach-pxa/generic.h +++ b/arch/arm/mach-pxa/generic.h @@ -26,11 +26,13 @@ extern void pxa_timer_init(void); #define ARRAY_AND_SIZE(x) (x), ARRAY_SIZE(x) #define pxa25x_handle_irq icip_handle_irq +extern int __init pxa25x_clocks_init(void); extern void __init pxa25x_init_irq(void); extern void __init pxa25x_map_io(void); extern void __init pxa26x_init_irq(void); #define pxa27x_handle_irq ichp_handle_irq +extern int __init pxa27x_clocks_init(void); extern void __init pxa27x_dt_init_irq(void); extern unsigned pxa27x_get_clk_frequency_khz(int); extern void __init pxa27x_init_irq(void); |