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AS3525: timer support

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19025 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Rafaël Carré 2008-11-06 02:31:32 +00:00
parent 7384454665
commit c3e667c198
3 changed files with 59 additions and 16 deletions
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13
firmware/export/as3525.h
View file

@ -275,12 +275,13 @@ interface */
#define TIMER_LOAD (*(volatile unsigned long*)(TIMER_BASE + 0x00)) /* 32-bit width */
#define TIMER_VALUE (*(volatile unsigned long*)(TIMER_BASE + 0x04)) /* 32 bit width */
#define TIMER_CONTROL (*(volatile unsigned long*)(TIMER_BASE + 0x08)) /* 8 bit width */
#define TIMER_INTCLR (*(volatile unsigned long*)(TIMER_BASE + 0x0C)) /* clears ir by write access */
#define TIMER_RIS (*(volatile unsigned long*)(TIMER_BASE + 0x10)) /* 1 bit width */
#define TIMER_MIS (*(volatile unsigned long*)(TIMER_BASE + 0x14)) /* 1 bit width */
#define TIMER1_LOAD (*(volatile unsigned long*)(TIMER_BASE + 0x00)) /* 32-bit width */
#define TIMER1_VALUE (*(volatile unsigned long*)(TIMER_BASE + 0x04)) /* 32 bit width */
#define TIMER1_CONTROL (*(volatile unsigned long*)(TIMER_BASE + 0x08)) /* 8 bit width */
#define TIMER1_INTCLR (*(volatile unsigned long*)(TIMER_BASE + 0x0C)) /* clears ir by write access */
#define TIMER1_RIS (*(volatile unsigned long*)(TIMER_BASE + 0x10)) /* 1 bit width */
#define TIMER1_MIS (*(volatile unsigned long*)(TIMER_BASE + 0x14)) /* 1 bit width */
#define TIMER1_BGLOAD (*(volatile unsigned long*)(TIMER_BASE + 0x18)) /* 32-bit width */
/**
* Counter/Timer control register bits

7
firmware/target/arm/as3525/system-as3525.c
View file

@ -215,7 +215,7 @@ void system_init(void)
asm volatile(
"mrs r0, cpsr \n"
"orr r0, r0, #0x80 \n" /* disable interrupts */
"bic r0, r0, #0x80 \n" /* enable interrupts */
"msr cpsr, r0 \n"
"mov r0, #0 \n"
"mcr p15, 0, r0, c7, c7 \n" /* invalidate icache & dcache */
@ -229,11 +229,12 @@ void system_init(void)
CGU_PERI |= (5<<2)|0x01; /* pclk = PLLA / 6 = 64 MHz */
#if 0 /* we don't use interrupts at the moment */
/* enable timer interface for TIMER1 & TIMER2 */
CGU_PERI |= CGU_TIMERIF_CLOCK_ENABLE;
/* enable VIC */
CGU_PERI |= CGU_VIC_CLOCK_ENABLE;
VIC_INT_SELECT = 0; /* only IRQ, no FIQ */
#endif
}
void system_reboot(void)

49
firmware/timer.c
View file

@ -52,6 +52,14 @@ void TIMER1(void)
pfn_timer();
TER1 = 0xff; /* clear all events */
}
#elif CONFIG_CPU == AS3525
void INT_TIMER1(void)
{
if (pfn_timer != NULL)
pfn_timer();
TIMER1_INTCLR = 0; /* clear interrupt */
}
#elif defined(CPU_PP)
void TIMER2(void)
{
@ -92,17 +100,23 @@ void TIMER1_ISR(void)
static bool timer_set(long cycles, bool start)
{
#if (CONFIG_CPU == SH7034) || defined(CPU_COLDFIRE)
#if CONFIG_CPU == SH7034 || defined(CPU_COLDFIRE) || CONFIG_CPU == AS3525
int phi = 0; /* bits for the prescaler */
int prescale = 1;
#if CONFIG_CPU == SH7034 || defined(CPU_COLDFIRE)
#define PRESCALE_STEP 1
#else /* CONFIG_CPU == AS3525 */
#define PRESCALE_STEP 4
#endif
while (cycles > 0x10000)
{ /* work out the smallest prescaler that makes it fit */
#if CONFIG_CPU == SH7034
#if CONFIG_CPU == SH7034 || CONFIG_CPU == AS3525
phi++;
#endif
prescale *= 2;
cycles >>= 1;
prescale <<= PRESCALE_STEP;
cycles >>= PRESCALE_STEP;
}
#endif
@ -153,6 +167,25 @@ static bool timer_set(long cycles, bool start)
TCNT4 = 0;
and_b(~0x01, &TSR4); /* clear an eventual interrupt */
return true;
#elif CONFIG_CPU == AS3525
/* XXX: 32 bits cycles could be used */
if (prescale > 256 || cycles > 0x10000)
return false;
if (start)
{
if (pfn_unregister != NULL)
{
pfn_unregister();
pfn_unregister = NULL;
}
}
TIMER1_LOAD = TIMER1_BGLOAD = cycles;
/* /!\ bit 4 (reserved) must not be modified
* periodic mode, interrupt enabled, 16 bits counter */
TIMER1_CONTROL = (TIMER1_CONTROL & (1<<4)) | 0xe0 | (phi<<2);
return true;
#elif defined CPU_COLDFIRE
if (prescale > 4096/CPUFREQ_MAX_MULT)
@ -282,6 +315,10 @@ bool timer_register(int reg_prio, void (*unregister_callback)(void),
irq_set_int_handler(IRQ_TIMER1, TIMER1_ISR);
irq_enable_int(IRQ_TIMER1);
return true;
#elif CONFIG_CPU == AS3525
CGU_PERI |= CGU_TIMER1_CLOCK_ENABLE; /* enable peripheral */
VIC_INT_ENABLE |= INTERRUPT_TIMER1;
return true;
#elif CONFIG_CPU == IMX31L
/* TODO */
return false;
@ -318,6 +355,10 @@ void timer_unregister(void)
#elif CONFIG_CPU == PNX0101
TIMER1.ctrl &= ~0x80; /* disable timer 1 */
irq_disable_int(IRQ_TIMER1);
#elif CONFIG_CPU == AS3525
TIMER1_CONTROL &= 0x10; /* disable timer 1 (don't modify bit 4) */
VIC_INT_EN_CLEAR |= INTERRUPT_TIMER1; /* disable interrupt */
CGU_PERI &= ~CGU_TIMER1_CLOCK_ENABLE; /* disable peripheral */
#elif CONFIG_CPU == S3C2440 || CONFIG_CPU == DM320
__TIMER_UNREGISTER();
#endif