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ARM: add initial timer support.

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Currently hardcoded to PXA (verdex) support, needs SoC abstraction
for seperating implementations, best done using FDT code as committed
by Francois.
This commit is contained in:
Ithamar R. Adema 2012-11-05 01:34:25 +01:00
parent d09e7b5b90
commit be7195d0f7
1 changed files with 53 additions and 10 deletions
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63
src/system/kernel/arch/arm/arch_timer.cpp
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@ -1,9 +1,10 @@
/*
* Copyright 2007, Haiku Inc. All rights reserved.
* Copyright 2007-2012, Haiku Inc. All rights reserved.
* Distributed under the terms of the MIT License.
*
* Authors:
* François Revol <revol@free.fr>
* Ithamar R. Adema <ithamar@upgrade-android.com>
*
* Copyright 2001, Travis Geiselbrecht. All rights reserved.
* Distributed under the terms of the NewOS License.
@ -16,30 +17,72 @@
#include <timer.h>
#include <arch/timer.h>
//#include <arch_platform.h>
#include <arch/cpu.h>
#define PXA_TIMERS_PHYS_BASE 0x40A00000
#define PXA_TIMERS_SIZE 0x000000C0
#define PXA_TIMERS_INTERRUPT 7 /* OST_4_11 */
#define PXA_OSSR 0x05
#define PXA_OIER 0x07
#define PXA_OSCR4 0x10
#define PXA_OSMR4 0x20
#define PXA_OMCR4 0x30
#define TRACE(x) //dprintf x
static area_id sPxaTimersArea;
static uint32 *sPxaTimersBase;
static int32
pxa_timer_interrupt(void *data)
{
int32 ret = timer_interrupt();
sPxaTimersBase[PXA_OSSR] |= (1 << 4);
return ret;
}
void
arch_timer_set_hardware_timer(bigtime_t timeout)
{
#warning ARM:WRITEME
// M68KPlatform::Default()->SetHardwareTimer(timeout);
TRACE(("arch_timer_set_hardware_timer(%lld): %p\n", timeout, sPxaTimersBase));
if (sPxaTimersBase) {
sPxaTimersBase[PXA_OIER] |= (1 << 4);
sPxaTimersBase[PXA_OMCR4] = 4; // set to exactly single milisecond resolution
sPxaTimersBase[PXA_OSMR4] = timeout;
sPxaTimersBase[PXA_OSCR4] = 0; // start counting from 0 again
}
}
void
arch_timer_clear_hardware_timer()
{
#warning ARM:WRITEME
// M68KPlatform::Default()->ClearHardwareTimer();
TRACE(("arch_timer_clear_hardware_timer: %p\n", sPxaTimersBase));
if (sPxaTimersBase) {
sPxaTimersBase[PXA_OMCR4] = 0; // disable our timer
sPxaTimersBase[PXA_OIER] &= ~(4 << 1);
}
}
int
arch_init_timer(kernel_args *args)
{
#warning ARM:WRITEME
// M68KPlatform::Default()->InitTimer(args);
return 0;
}
sPxaTimersArea = map_physical_memory("pxa_timers", PXA_TIMERS_PHYS_BASE,
PXA_TIMERS_SIZE, 0, B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA, (void**)&sPxaTimersBase);
if (sPxaTimersArea < 0)
return sPxaTimersArea;
sPxaTimersBase[PXA_OMCR4] = 0; // disable our timer
install_io_interrupt_handler(PXA_TIMERS_INTERRUPT, &pxa_timer_interrupt, NULL, 0);
return B_OK;
}