usb-interrupt.c

00001 #include <AT91SAM7S64.h>
00002 #include <interrupt-utils.h>
00003 #include <usb-interrupt.h>
00004 #include <usb-api.h>
00005 #include <stdio.h>
00006 
00007 static void
00008 usb_int_safe (void) __attribute__((noinline));
00009 
00010 static void 
00011 usb_int_safe (void)
00012 {
00013   unsigned int int_status;
00014   /* putchar('*'); */
00015   int_status = *AT91C_UDP_ISR & *AT91C_UDP_IMR;
00016   
00017   if (int_status &  (AT91C_UDP_EP0 | AT91C_UDP_EP1 | AT91C_UDP_EP2
00018                      | AT91C_UDP_EP3)) {
00019     unsigned int ep_index;
00020     /* Handle enabled interrupts */
00021     for (ep_index = 0; ep_index < 4; ep_index++) {
00022       if (int_status & (1<<ep_index)) {
00023         usb_arch_transfer_complete(ep_index);
00024       }
00025     }
00026   } else if (int_status &  AT91C_UDP_ENDBUSRES) {
00027     *AT91C_UDP_ICR = AT91C_UDP_ENDBUSRES;
00028     usb_arch_reset_int();
00029   } else if (int_status &  AT91C_UDP_RXSUSP) {
00030     /* puts("Suspend"); */
00031     *AT91C_UDP_ICR = AT91C_UDP_RXSUSP;
00032     usb_arch_suspend_int();
00033   } else if (int_status &  AT91C_UDP_RXRSM) {
00034     /* puts("Resume"); */
00035     *AT91C_UDP_ICR = AT91C_UDP_RXRSM;
00036     usb_arch_resume_int();
00037   } else if (int_status &  AT91C_UDP_SOFINT) {
00038     /* puts("SOF"); */
00039     *AT91C_UDP_ICR = AT91C_UDP_SOFINT;
00040   } else if (int_status &  AT91C_UDP_WAKEUP) {
00041     /* puts("Wakeup"); */
00042     *AT91C_UDP_ICR = AT91C_UDP_WAKEUP;
00043   } else {
00044     puts("Other USB interrupt"); 
00045   }
00046   /* dbg_putchar('<'); */
00047 
00048 }
00049 
00050 void NACKEDFUNC
00051 usb_int (void)
00052 {
00053   ISR_STORE();
00054   ISR_ENABLE_NEST();
00055   usb_int_safe();
00056   ISR_DISABLE_NEST();
00057   *AT91C_AIC_EOICR = 0; 
00058   ISR_RESTORE();
00059 }