Hi there,
Thanks for the help.
This code works:
/*
* Kernel interrupt demo for Timer Channel 0
* Author :
* Date : 24.02.2009
* Version : 1.00
* License : GPL
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <asm/irq.h>
#include <linux/platform_device.h>
#include <linux/ioctl.h>
#include <asm/hardware.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
#include <asm/irq.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <asm-arm/arch-at91rm9200/hardware.h>
#include <asm-arm/arch-at91rm9200/at91rm9200_tc.h>
#include <asm-arm/arch-at91rm9200/at91rm9200.h>
#include <asm/uaccess.h>
#include <asm/arch/hardware.h>
#include <asm/mach/time.h>
#include "adirq.h"
//#include "at91_timer.h"
#define AT91_TC0 0x00
#define AT91_TC1 0x40
#define AT91_TC2 0x80
#define AT91_TC3 0x00
#define AT91_TC4 0x40
#define AT91_TC5 0x80
static void __exit ad_irq_cleanup(void);
static volatile unsigned long ad_irq_count = 0;
#ifdef MODULE_AUTHOR
MODULE_AUTHOR("Ole");
MODULE_DESCRIPTION("AD Kernel interrupt module for DNP/9200");
MODULE_LICENSE("GPL");
#endif
/* unload kernel module */
static void __exit ad_irq_cleanup(void) {
/* unregister irq handler */
free_irq(AT91_ID_TC0, NULL);
printk(KERN_INFO "ad_irq module removed.\n");
}
/*
* Read from Timerblock 0 registers.
*/
static inline unsigned long at91_tcb1_read(unsigned int reg)
{
void __iomem *tcb1_base = (void __iomem *)AT91_VA_BASE_TCB0;
printk(KERN_INFO "read p: %p + (%d)\n", tcb1_base, reg);
return __raw_readl(tcb1_base + reg);
}
/*
* Write to Timerblock 0 registers.
*/
static inline void at91_tcb1_write(unsigned int reg, unsigned long value)
{
void __iomem *tcb1_base = (void __iomem *)AT91_VA_BASE_TCB0;
printk(KERN_INFO "write p: %p + (%d)\n", tcb1_base, reg);
__raw_writel(value, tcb1_base + reg);
}
/*
* Read from Timerblock 1 registers.
*/
static inline unsigned long at91_tcb2_read(unsigned int reg)
{
void __iomem *tcb2_base = (void __iomem *)AT91_VA_BASE_TCB1;
return __raw_readl(tcb2_base + reg);
}
/*
* Write to Timerblock 1 registers.
*/
static inline void at91_tcb2_write(unsigned int reg, unsigned long value)
{
void __iomem *tcb2_base = (void __iomem *)AT91_VA_BASE_TCB1;
__raw_writel(value, tcb2_base + reg);
}
/* irq timer routine */
irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) {
unsigned int status;
// read & clear status:
status = at91_tcb1_read(AT91_TC0 + AT91_TC_SR);
ad_irq_count++;
return(IRQ_HANDLED);
}
static int __init ad_irq_init(void)
{
printk(KERN_INFO "init timer\n");
// disable clock:
at91_tcb1_write(AT91_TC0 + AT91_TC_CCR, ((at91_tcb1_read(AT91_TC0 +
AT91_TC_CCR) | 2) ) );
// disable all Timer Channel 0 interrupts:
at91_tcb1_write(AT91_TC0 + AT91_TC_IDR, 0xFFFFFFFF );
// read & clear status:
at91_tcb1_read(AT91_TC0 + AT91_TC_SR );
// enable timer clock 5, reset counter and start clock
at91_tcb1_write(AT91_TC0 + AT91_TC_CMR, AT91_TC_TIMER_CLOCK4 |
AT91_TC_CPCTRG | !AT91_TC_WAVE );
printk(KERN_INFO "CMR: %d\n", at91_tcb1_read(AT91_TC0 + AT91_TC_CMR) );
// Enables the RC Compare Interrupt:
at91_tcb1_write(AT91_TC0 + AT91_TC_IER, 0x10 );
if (request_irq(AT91_ID_TC0, (void *)timer_interrupt, 0
,AD_IRQ_DEVICE_NAME, NULL)) {
printk(KERN_ERR "ad_irq: irq alrdy claimed!\n");
return -EIO;
}
// write something to timer register c:
at91_tcb1_write( AT91_TC0 + AT91_TC_RC , 0xFBC5 );
// enable & start clock
at91_tcb1_write(AT91_TC0 + AT91_TC_CCR , 0x01 );
at91_tcb1_write(AT91_TC0 + AT91_TC_CCR , 0x05 );
// maybe sync is needed ?
at91_tcb1_write(AT91_TC0 + AT91_TC_BMR, 1 );
printk(KERN_INFO "ad_irq module installed with irqnr=%d.\n",
AT91_ID_TC0);
return 0;
}
EXPORT_NO_SYMBOLS;
module_init(ad_irq_init);
module_exit(ad_irq_cleanup);
On Tue, 24 Feb 2009 08:11:07 +0800, Peter Teoh <[email protected]>
wrote:
> it seemed there is either:
>
> 1. some missing registers not setup.
> 2. or some of the register setup got its order wrong.
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