Dear mailinglist subscribers,
I am currently trying to write a suspend (via wait-for-interrupt, cp15 instruction) function in the u-boot context which will recover on a gpio edge event. Thus I am trying to enable interrupts via the interrupt function the linux kernel uses (see end of this mail). Unfortunately the cp15 instruction never recovered.
Now I am stuck with this, I try to write some registers to configure timers (to force create cyclic interrupts) and unmask all kind of interrupts, but the intended values actually never get written to the registers. I am really puzzled.
Any help, demo implementation or tipp is really appreciated.
Best regards
Bernhard
post scriptum:
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code (chunk from init function):
struct kwcpu_registers *cpureg = (struct kwcpu_registers*)(KW_REGISTER(0x20100)); writel (&cpureg->ahb_mbus_mask_irq, 0xFFFFFFFF); writel (&cpureg->ahb_mbus_cause_irq, 0);
struct kwgpio_registers *gpio0reg = (struct kwgpio_registers*)(KW_GPIO0_BASE); struct kwgpio_registers *gpio1reg = (struct kwgpio_registers*)(KW_GPIO1_BASE);
//unmask edge fun, disable level stuff writel (&gpio0reg->irq_mask, 0xFFFFFFFF); writel (&gpio0reg->irq_level, 0); writel (&gpio1reg->irq_mask, 0xFFFFFFFF); writel (&gpio1reg->irq_level, 0);
struct kwtimer_registers *timer = (struct kwtimer_registers*)(KW_TIMER_BASE); writel (&timer->t0, 0x000FFFFF); writel (&timer->reload0, 0x00000FFF); writel (&timer->t1, 0x000FFFFF); writel (&timer->reload1, 0x00000FFF); writel (&timer->ctl, 0x0F); //enable both timers, no watchdog
printf ("cpu config 0x%08x\n", readl(&cpureg->config)); printf ("cpu ctrl_stat 0x%08x\n", readl(&cpureg->ctrl_stat)); printf ("mbus mask 0x%08x\n", readl(&cpureg->ahb_mbus_mask_irq)); printf ("mbus cause 0x%08x\n", readl(&cpureg->ahb_mbus_cause_irq)); printf ("timer 0 RELOAD VAL 0x%08x\n", readl(&timer->reload0)); printf ("timer 1 RELOAD VAL 0x%08x\n", readl(&timer->reload1)); printf ("GPIO 0 Edge 0x%08x\n", readl(&gpio0reg->irq_mask)); printf ("GPIO 0 Level 0x%08x\n", readl(&gpio0reg->irq_level)); printf ("GPIO 1 Edge 0x%08x\n", readl(&gpio1reg->irq_mask)); printf ("GPIO 1 Level 0x%08x\n", readl(&gpio1reg->irq_level));
printf ("0x%08x (low interrupt cause)\n", (u32) readl (KW_REGISTER(0x20200))); printf ("0x%08x (high interrupt cause)\n", (u32) readl (KW_REGISTER(0x20210)));
output from the above indented chunk:
cpu config 0x00100036 cpu ctrl_stat 0x00000001 mbus mask 0x00000000 mbus cause 0x00000002 //mbus interrupt source detected timer 0 RELOAD VAL 0xffffffff //just wrong, we did write 0x00000FFF to that one timer 1 RELOAD VAL 0x00000000 //just wrong 0x00000FFF GPIO 0 Edge 0x00000000 // wrong GPIO 0 Level 0x00000000 // wrong GPIO 1 Edge 0x00000000 // wrong GPIO 1 Level 0x00000000 // wrong 0x00800000 (low interrupt cause) // spi interrupt detected, not expected 0x00000000 (high interrupt cause)
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/* * Enable IRQs */ inline void arch_local_irq_enable(void) { unsigned long temp; __asm__ __volatile__( "mrs %0, cpsr @ arch_local_irq_enable\n" "bic %0, %0, #128\n" "msr cpsr_c, %0" : "=r" (temp) : : "memory", "cc"); }
/* * Disable IRQs */ inline void arch_local_irq_disable(void) { unsigned long temp; __asm__ __volatile__( "mrs %0, cpsr @ arch_local_irq_disable\n" "orr %0, %0, #128\n" "msr cpsr_c, %0" : "=r" (temp) : : "memory", "cc"); }