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rk27xx: optimize irq_handler()

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Change-Id: Idd3141e57b70e9b28b91748bc71208d9afffcd57
Reviewed-on: http://gerrit.rockbox.org/381
Reviewed-by: Marcin Bukat <marcin.bukat@gmail.com>
Tested-by: Marcin Bukat <marcin.bukat@gmail.com>
This commit is contained in:
Marcin Bukat 2013-01-11 13:31:57 +01:00
parent efe1042759
commit 2ef7a549d5
1 changed files with 13 additions and 18 deletions
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31
firmware/target/arm/rk27xx/system-rk27xx.c
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@ -65,7 +65,7 @@ default_interrupt(INT_SW_INT1);
default_interrupt(INT_SW_INT2);
default_interrupt(INT_SW_INT3);
static void (* const irqvector[])(void) =
static void (* const irqvector[])(void) USED_ATTR =
{
INT_UART0,INT_UART1,INT_TIMER0,INT_TIMER1,INT_TIMER2,INT_GPIO0,INT_SW_INT0,INT_AHB0_MAILBOX,
INT_RTC,INT_SCU,INT_SD,INT_SPI,INT_HDMA,INT_A2A_BRIDGE,INT_I2C,INT_I2S,
@ -89,23 +89,18 @@ static void UIRQ(void)
void irq_handler(void)
{
/*
* Based on: linux/arch/arm/kernel/entry-armv.S and system-meg-fx.c
*/
asm volatile( "stmfd sp!, {r0-r7, ip, lr} \n" /* Store context */
"sub sp, sp, #8 \n"); /* Reserve stack */
int irq_no = INTC_ISR & 0x1f;
irqvector[irq_no]();
/* clear interrupt */
INTC_ICCR = (1 << irq_no);
asm volatile( "add sp, sp, #8 \n" /* Cleanup stack */
"ldmfd sp!, {r0-r7, ip, lr} \n" /* Restore context */
"subs pc, lr, #4 \n"); /* Return from IRQ */
asm volatile("stmfd sp!, {r0-r5, ip, lr} \n" /* store context */
"ldr r4, =0x18080000 \n" /* INTC base */
"ldr r5, [r4, #0x104] \n" /* INTC_ISR */
"and r5, r5, #0x1f \n" /* irq_no = INTC_ISR & 0x1f */
"ldr r3, =irqvector \n"
"ldr r3,[r3, r5, lsl #2] \n"
"blx r3 \n" /* irqvector[irq_no]() */
"mov r3, #1 \n"
"lsl r5, r3, r5 \n" /* clear interrupt */
"str r5, [r4, #0x118] \n" /* INTC_ICCR = (1<<irq_no) */
"ldmfd sp!, {r0-r5, ip, lr} \n" /* restore context */
"subs pc, lr, #4 \n");
}
void fiq_dummy(void)