Added CAN chip specific irq_accept routine for fast interrupt acknowledge.

[lincan.git] / lincan / src / i82527.c

diff --git a/lincan/src/i82527.c b/lincan/src/i82527.c
index d11a79b740c8d6d8ef86706067b38835ab2d78a6..7834c1bc8b35ad7cb40dcf52ee8138b7b7987064 100644 (file)
--- a/lincan/src/i82527.c
+++ b/lincan/src/i82527.c
@@ -131,7 +131,8 @@ int i82527_baud_rate(struct canchip_t *chip, int rate, int clock, int sjw,
        if (i82527_enable_configuration(chip))
                return -ENODEV;
 
-       clock /=2;
+       if(chip->int_cpu_reg & iCPU_DSC)
+               clock /=2;
 
        /* tseg even = round down, odd = round up */
        for (tseg=(0+0+2)*2; tseg<=(MAX_TSEG2+MAX_TSEG1+2)*2+1; tseg++) {
@@ -618,6 +619,7 @@ int i82527_irq_handler(int irq, struct canchip_t *chip)
        unsigned irq_register;
        unsigned object;
        struct msgobj_t *obj;
+       int loop_cnt=CHIP_MAX_IRQLOOP;
 
        /*put_reg=device->hwspecops->write_register;*/
        /*get_reg=device->hwspecops->read_register;*/
@@ -632,6 +634,12 @@ int i82527_irq_handler(int irq, struct canchip_t *chip)
 
        do {
 
+               if(!loop_cnt--) {
+                       CANMSG("i82527_irq_handler IRQ %d stuck\n",irq);
+                       CANMSG("i82527_irq_register 0x%x\n",irq_register);
+                       return CANCHIP_IRQ_STUCK;
+               }
+               
                DEBUGMSG("i82527: iIRQ 0x%02x\n",irq_register);
                
                if (irq_register == 0x01) {
@@ -660,7 +668,7 @@ int i82527_irq_handler(int irq, struct canchip_t *chip)
 
                        i82527_irq_read_handler(chip, obj, object); 
                }
-
+               
        } while((irq_register=i82527_seg_read_reg(chip, iIRQ)) != 0);
 
        return CANCHIP_IRQ_HANDLED;
@@ -747,6 +755,7 @@ int i82527_register(struct chipspecops_t *chipspecops)
        chipspecops->start_chip = i82527_start_chip;
        chipspecops->stop_chip = i82527_stop_chip;
        chipspecops->irq_handler = i82527_irq_handler;
+       chipspecops->irq_accept = NULL;
        return 0;
 }