diff options
Diffstat (limited to 'arch/cris/include/arch-v10/arch/irq.h')
| -rw-r--r-- | arch/cris/include/arch-v10/arch/irq.h | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/arch/cris/include/arch-v10/arch/irq.h b/arch/cris/include/arch-v10/arch/irq.h new file mode 100644 index 0000000..6248004 --- /dev/null +++ b/arch/cris/include/arch-v10/arch/irq.h @@ -0,0 +1,160 @@ +/* + * Interrupt handling assembler and defines for Linux/CRISv10 + */ + +#ifndef _ASM_ARCH_IRQ_H +#define _ASM_ARCH_IRQ_H + +#include <arch/sv_addr_ag.h> + +#define NR_IRQS 32 + +/* The first vector number used for IRQs in v10 is really 0x20 */ +/* but all the code and constants are offseted to make 0 the first */ +#define FIRST_IRQ 0 + +#define SOME_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, some) /* 0 ? */ +#define NMI_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, nmi) /* 1 */ +#define TIMER0_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, timer0) /* 2 */ +#define TIMER1_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, timer1) /* 3 */ +/* mio, ata, par0, scsi0 on 4 */ +/* par1, scsi1 on 5 */ +#define NETWORK_STATUS_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, network) /* 6 */ + +#define SERIAL_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, serial) /* 8 */ +#define PA_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, pa) /* 11 */ +/* extdma0 and extdma1 is at irq 12 and 13 and/or same as dma5 and dma6 ? */ +#define EXTDMA0_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, ext_dma0) +#define EXTDMA1_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, ext_dma1) + +/* dma0-9 is irq 16..25 */ +/* 16,17: network */ +#define DMA0_TX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma0) +#define DMA1_RX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma1) +#define NETWORK_DMA_TX_IRQ_NBR DMA0_TX_IRQ_NBR +#define NETWORK_DMA_RX_IRQ_NBR DMA1_RX_IRQ_NBR + +/* 18,19: dma2 and dma3 shared by par0, scsi0, ser2 and ata */ +#define DMA2_TX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma2) +#define DMA3_RX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma3) +#define SER2_DMA_TX_IRQ_NBR DMA2_TX_IRQ_NBR +#define SER2_DMA_RX_IRQ_NBR DMA3_RX_IRQ_NBR + +/* 20,21: dma4 and dma5 shared by par1, scsi1, ser3 and extdma0 */ +#define DMA4_TX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma4) +#define DMA5_RX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma5) +#define SER3_DMA_TX_IRQ_NBR DMA4_TX_IRQ_NBR +#define SER3_DMA_RX_IRQ_NBR DMA5_RX_IRQ_NBR + +/* 22,23: dma6 and dma7 shared by ser0, extdma1 and mem2mem */ +#define DMA6_TX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma6) +#define DMA7_RX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma7) +#define SER0_DMA_TX_IRQ_NBR DMA6_TX_IRQ_NBR +#define SER0_DMA_RX_IRQ_NBR DMA7_RX_IRQ_NBR +#define MEM2MEM_DMA_TX_IRQ_NBR DMA6_TX_IRQ_NBR +#define MEM2MEM_DMA_RX_IRQ_NBR DMA7_RX_IRQ_NBR + +/* 24,25: dma8 and dma9 shared by ser1 and usb */ +#define DMA8_TX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma8) +#define DMA9_RX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma9) +#define SER1_DMA_TX_IRQ_NBR DMA8_TX_IRQ_NBR +#define SER1_DMA_RX_IRQ_NBR DMA9_RX_IRQ_NBR +#define USB_DMA_TX_IRQ_NBR DMA8_TX_IRQ_NBR +#define USB_DMA_RX_IRQ_NBR DMA9_RX_IRQ_NBR + +/* usb: controller at irq 31 + uses DMA8 and DMA9 */ +#define USB_HC_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, usb) + +/* our fine, global, etrax irq vector! the pointer lives in the head.S file. */ + +typedef void (*irqvectptr)(void); + +struct etrax_interrupt_vector { + irqvectptr v[256]; +}; + +extern struct etrax_interrupt_vector *etrax_irv; +void set_int_vector(int n, irqvectptr addr); +void set_break_vector(int n, irqvectptr addr); + +#define __STR(x) #x +#define STR(x) __STR(x) + +/* SAVE_ALL saves registers so they match pt_regs */ + +#define SAVE_ALL \ + "move $irp,[$sp=$sp-16]\n\t" /* push instruction pointer and fake SBFS struct */ \ + "push $srp\n\t" /* push subroutine return pointer */ \ + "push $dccr\n\t" /* push condition codes */ \ + "push $mof\n\t" /* push multiply overflow reg */ \ + "di\n\t" /* need to disable irq's at this point */\ + "subq 14*4,$sp\n\t" /* make room for r0-r13 */ \ + "movem $r13,[$sp]\n\t" /* push the r0-r13 registers */ \ + "push $r10\n\t" /* push orig_r10 */ \ + "clear.d [$sp=$sp-4]\n\t" /* frametype - this is a normal stackframe */ + + /* BLOCK_IRQ and UNBLOCK_IRQ do the same as mask_irq and unmask_irq */ + +#define BLOCK_IRQ(mask,nr) \ + "move.d " #mask ",$r0\n\t" \ + "move.d $r0,[0xb00000d8]\n\t" + +#define UNBLOCK_IRQ(mask) \ + "move.d " #mask ",$r0\n\t" \ + "move.d $r0,[0xb00000dc]\n\t" + +#define IRQ_NAME2(nr) nr##_interrupt(void) +#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr) +#define sIRQ_NAME(nr) IRQ_NAME2(sIRQ##nr) +#define BAD_IRQ_NAME(nr) IRQ_NAME2(bad_IRQ##nr) + + /* the asm IRQ handler makes sure the causing IRQ is blocked, then it calls + * do_IRQ (with irq disabled still). after that it unblocks and jumps to + * ret_from_intr (entry.S) + * + * The reason the IRQ is blocked is to allow an sti() before the handler which + * will acknowledge the interrupt is run. + */ + +#define BUILD_IRQ(nr,mask) \ +void IRQ_NAME(nr); \ +__asm__ ( \ + ".text\n\t" \ + "IRQ" #nr "_interrupt:\n\t" \ + SAVE_ALL \ + BLOCK_IRQ(mask,nr) /* this must be done to prevent irq loops when we ei later */ \ + "moveq "#nr",$r10\n\t" \ + "move.d $sp,$r11\n\t" \ + "jsr do_IRQ\n\t" /* irq.c, r10 and r11 are arguments */ \ + UNBLOCK_IRQ(mask) \ + "moveq 0,$r9\n\t" /* make ret_from_intr realise we came from an irq */ \ + "jump ret_from_intr\n\t"); + +/* This is subtle. The timer interrupt is crucial and it should not be disabled for + * too long. However, if it had been a normal interrupt as per BUILD_IRQ, it would + * have been BLOCK'ed, and then softirq's are run before we return here to UNBLOCK. + * If the softirq's take too much time to run, the timer irq won't run and the + * watchdog will kill us. + * + * Furthermore, if a lot of other irq's occur before we return here, the multiple_irq + * handler is run and it prioritizes the timer interrupt. However if we had BLOCK'ed + * it here, we would not get the multiple_irq at all. + * + * The non-blocking here is based on the knowledge that the timer interrupt is + * registred as a fast interrupt (IRQF_DISABLED) so that we _know_ there will not + * be an sti() before the timer irq handler is run to acknowledge the interrupt. + */ + +#define BUILD_TIMER_IRQ(nr,mask) \ +void IRQ_NAME(nr); \ +__asm__ ( \ + ".text\n\t" \ + "IRQ" #nr "_interrupt:\n\t" \ + SAVE_ALL \ + "moveq "#nr",$r10\n\t" \ + "move.d $sp,$r11\n\t" \ + "jsr do_IRQ\n\t" /* irq.c, r10 and r11 are arguments */ \ + "moveq 0,$r9\n\t" /* make ret_from_intr realise we came from an irq */ \ + "jump ret_from_intr\n\t"); + +#endif |
