Next round of trying to allow handling VME interrupts of multiple

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

diff --git a/lincan/src/can_devrtl.c b/lincan/src/can_devrtl.c
index 25b8b482f8a9d7a0b57d7319835e512fb7b0a577..052090264e405f7f8d0c8f8740256adc7cbd53a4 100644 (file)
--- a/lincan/src/can_devrtl.c
+++ b/lincan/src/can_devrtl.c
@@ -16,15 +16,22 @@
 
 #include <rtl_malloc.h>
 
+#ifdef CAN_ENABLE_VME_SUPPORT
+#include "ca91c042.h"
+/* Modified version of ca91c042 driver can be found in
+ * components/comm/contrib directory. */
+#endif
+
 can_spinlock_t can_irq_manipulation_lock;
 
 unsigned int can_rtl_isr( unsigned int irq_num, struct pt_regs *r )
 {
-       struct chip_t *chip;
+       struct canchip_t *chip;
        struct candevice_t *candev;
        int board_nr;
        int chip_nr;
        int irq2linux=0;
+       int ret;
        pthread_t thread=NULL;
 
        DEBUGMSG("can_rtl_isr invoked for irq %d\n",irq_num);
@@ -38,18 +45,28 @@ unsigned int can_rtl_isr( unsigned int irq_num, struct pt_regs *r )
                                continue;
                        if(chip->chip_irq!=irq_num) continue;
 
+                       if(chip->chipspecops->irq_accept)
+                               ret=chip->chipspecops->irq_accept(chip->chip_irq,chip);
+
                        set_bit(MSGOBJ_IRQ_REQUEST_b,&chip->pend_flags);
                        set_bit(MSGOBJ_WORKER_WAKE_b,&chip->pend_flags);
                        if(chip->flags & CHIP_IRQ_PCI)
                                irq2linux=1;
+#ifdef CAN_ENABLE_VME_SUPPORT
+                       if (chip->flags & CHIP_IRQ_VME)
+                                tundra_rtl_ack_irq_vector(irq_num);
+#endif
                        if(!chip->worker_thread) continue;
                        thread=chip->worker_thread;
                        pthread_kill(thread,RTL_SIGNAL_WAKEUP);
                }
        }
 
-       if(irq2linux)
-               rtl_global_pend_irq(irq_num);
+        /* The following lines are commented out because of it is not
+         * possible to share level activated (PCI) IRQs between Linux
+         * and RT-Linux. */
+/*     if(irq2linux) */
+/*             rtl_global_pend_irq(irq_num); */
 
        /*if(thread) rtl_reschedule_thread(thread);*/
 
@@ -74,7 +91,7 @@ rtl_free_global_irq( irq )
 
 void * can_chip_worker_thread(void *arg)
 {
-       struct chip_t *chip = (struct chip_t *) arg;
+       struct canchip_t *chip = (struct canchip_t *) arg;
        struct msgobj_t *obj;
        int ret, i;
        int loop_cnt;
@@ -126,8 +143,23 @@ void * can_chip_worker_thread(void *arg)
 
                /*re-enable chip IRQ, I am not sure, if this is required,
                  but it seems to not work without that */
-               if(chip->chip_irq>=0)
-                       can_enable_irq(chip->chip_irq);
+               if(chip->chip_irq>=0) {
+                       if ((chip->flags & CHIP_IRQ_VME) == 0) can_enable_irq(chip->chip_irq);
+                   #ifdef CAN_ENABLE_VME_SUPPORT
+                     #if 0
+                       else tundra_rtl_enable_pci_irq();
+                     #endif
+                       /* FIXME: Bad practice. Doesn't work with more
+                        * than one card.
+                        *
+                        * irq_accept added to the LinCAN driver now,
+                        * and above workaround should not be required.
+                        * Enable rtl_hard_enable_irq() at line 
+                        * ca91c042.c:1045
+                        */
+                   #endif /*CAN_ENABLE_VME_SUPPORT*/
+
+               }
 
                RTL_MARK_SUSPENDED(pthread_self());
                if(test_and_clear_bit(MSGOBJ_WORKER_WAKE_b,&chip->pend_flags)){
@@ -141,7 +173,7 @@ void * can_chip_worker_thread(void *arg)
 }
 
 
-int can_chip_setup_irq(struct chip_t *chip)
+int can_chip_setup_irq(struct canchip_t *chip)
 {
        int ret;
         struct sched_param sched_param;
@@ -159,8 +191,16 @@ int can_chip_setup_irq(struct chip_t *chip)
                attrib_p=&attrib;
        }
        
-       if(chip->chipspecops->irq_handler){
-               if (rtl_request_irq(chip->chip_irq,can_rtl_isr))
+       if(chip->chipspecops->irq_handler && !(chip->flags & CHIP_IRQ_CUSTOM)){
+               int (*my_request_irq)(unsigned int vector, unsigned int (*rtl_handler)(unsigned int irq, struct pt_regs *regs));
+#ifdef CAN_ENABLE_VME_SUPPORT
+               if ((chip->flags & CHIP_IRQ_VME) != 0)
+                       my_request_irq = rtl_request_vmeirq;
+               else
+#endif
+                       my_request_irq = rtl_request_irq;
+
+               if (my_request_irq(chip->chip_irq,can_rtl_isr))
                        return -1;
                else {
                        DEBUGMSG("Registered interrupt %d\n",chip->chip_irq);
@@ -174,12 +214,20 @@ int can_chip_setup_irq(struct chip_t *chip)
 }
 
 
-void can_chip_free_irq(struct chip_t *chip)
+void can_chip_free_irq(struct canchip_t *chip)
 {
        if(chip->worker_thread)
                pthread_delete_np(chip->worker_thread);
-       if((chip->flags & CHIP_IRQ_SETUP) && (chip->chip_irq>=0)) {
-               rtl_free_irq(chip->chip_irq);
+       if((chip->flags & CHIP_IRQ_SETUP) && (chip->chip_irq>=0)
+           && !(chip->flags & CHIP_IRQ_CUSTOM)) {
+               int (*my_free_irq)(unsigned int vector);
+#ifdef CAN_ENABLE_VME_SUPPORT
+               if ((chip->flags & CHIP_IRQ_VME) != 0)
+                       my_free_irq = rtl_free_vmeirq;
+               else
+#endif
+                       my_free_irq = rtl_free_irq;
+               my_free_irq(chip->chip_irq);
                chip->flags &= ~CHIP_IRQ_SETUP;
        }
 }