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NetBSD/sys/arch/arm32/iomd/iomd_irq.S

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/* $NetBSD: iomd_irq.S,v 1.14 1997/10/14 11:05:58 mark Exp $ */
/*
* Copyright (c) 1994-1997 Mark Brinicombe.
* Copyright (c) 1994 Brini.
* All rights reserved.
*
* This code is derived from software written for Brini by Mark Brinicombe
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Brini.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* RiscBSD kernel project
*
* irq.S
*
* Low level irq and fiq handlers
*
* Created : 27/09/94
*/
#include "assym.h"
#include <machine/cpu.h>
#include <machine/frame.h>
#include <arm32/iomd/iomdreg.h>
sp .req r13
lr .req r14
pc .req r15
.text
/*
*
* irq_entry
*
* Main entry point for the IRQ vector
*
* This function reads the irq request bits in the IOMD registers
* IRQRQA, IRQRQB and DMARQ
* It then calls an installed handler for each bit that is set.
* The function stray_irqhandler is called if a handler is not defined
* for a particular interrupt.
* If a interrupt handler is found then it is called with r0 containing
* the argument defined in the handler structure. If the field ih_arg
* is zero then a pointer to the IRQ frame on the stack is passed instead.
*/
Ldisabled_mask:
.word _disabled_mask
Lcurrent_spl_level:
.word _current_spl_level
Lcurrent_intr_depth:
.word _current_intr_depth
.text
.global irq_entry
/*
* Regsister usage
*
* r6 - Address of current handler
* r7 - Pointer to handler pointer list
* r8 - Current IRQ requests.
* r9 - Used to count through possible IRQ bits.
* r10 - Base address of IOMD
*/
irq_entry:
sub lr, lr, #0x00000004 /* Adjust the lr */
PUSHFRAMEINSVC /* Push an interrupt frame */
/* mov r11, #0x00000000*/ /* Trace back stops here */
/* Load r8 with the IOMD interrupt requests */
mov r10, #(IOMD_BASE) /* Point to the IOMD */
ldrb r8, [r10, #(IOMD_IRQRQA << 2)] /* Get IRQ request A */
ldrb r9, [r10, #(IOMD_IRQRQB << 2)] /* Get IRQ request B */
orr r8, r8, r9, lsl #8
#ifdef CPU_ARM7500
ldrb r9, [r10, #(IOMD_IRQRQC << 2)] /* Get IRQ request C */
orr r8, r8, r9, lsl #16
ldrb r9, [r10, #(IOMD_IRQRQD << 2)] /* Get IRQ request D */
orr r8, r8, r9, lsl #24
ldrb r9, [r10, #(IOMD_DMARQ << 2)] /* Get DMA Request */
tst r9, #0x10
orrne r8, r8, r9, lsl #27
#else
ldrb r9, [r10, #(IOMD_DMARQ << 2)] /* Get DMA Request */
orr r8, r8, r9, lsl #16
#endif /* CPU_ARM7500 */
and r0, r8, #0x7d /* Clear IOMD IRQA bits */
strb r0, [r10, #(IOMD_IRQRQA << 2)]
/*
* Note that we have entered the IRQ handler.
* We are in SVC mode so we cannot use the processor mode
* to determine if we are in an IRQ. Instead we will count the
* each time the interrupt handler is nested.
*/
ldr r0, Lcurrent_intr_depth
ldr r1, [r0]
add r1, r1, #1
str r1, [r0]
/* Block the current requested interrupts */
ldr r1, Ldisabled_mask
ldr r0, [r1]
stmfd sp!, {r0}
orr r0, r0, r8
str r0, [r1]
/*
* Need to block all interrupts at the IPL or lower for
* all asserted interrupts.
* This basically emulates hardware interrupt priority levels.
* Means we need to go through the interrupt mask and for
* every asserted interrupt we need to mask out all other
* interrupts at the same or lower IPL.
* If only we could wait until the main loop but we need to sort
* this out first so interrupts can be re-enabled.
*
* This would benefit from a special ffs type routine
*/
mov r9, #0x00000001
ldr r7, Lirqblock
emulate_hwipl_loop:
tst r8, r9
ldrne r6, [r7]
orrne r0, r0, r6
add r7, r7, #4
mov r9, r9, lsl #1 /* move on to next bit */
#ifdef CPU_ARM7500
teq r9, #0 /* done the last bit ? */
#else
teq r9, #(1 << 24) /* done the last bit ? */
#endif /* CPU_ARM7500 */
bne emulate_hwipl_loop /* no - loop back. */
str r0, [r1]
/* Update the IOMD irq masks */
bl _irq_setmasks
mrs r0, cpsr_all /* Enable IRQ's */
bic r0, r0, #I32_bit
msr cpsr_all, r0
ldr r7, [pc, #irqhandlers - . - 8]
mov r9, #0x00000001
stmfd sp!, {r8}
irqloop:
/* This would benefit from a special ffs type routine */
tst r8, r9 /* Is a bit set ? */
beq nextirq /* No ? try next bit */
ldr r6, [r7] /* Get address of first handler structure */
teq r6, #0x00000000 /* Do we have a handler */
moveq r0, r8 /* IRQ requests as arg 0 */
beq _stray_irqhandler /* call special handler */
ldr r0, Lcnt
ldr r1, [r0, #(V_INTR)]
add r1, r1, #0x00000001
str r1, [r0, #(V_INTR)]
irqchainloop:
add lr, pc, #nextinchain - . - 8 /* return address */
/*
* XXX: Should stats be accumlated for every interrupt routine called
* or for every physical interrupt that is serviced.
*/
#ifdef IRQSTATS
ldr r0, Lintrcnt
ldr r1, [r6, #(IH_NUM)]
add r0, r0, r1, lsl #2
ldr r1, [r0]
add r1, r1, #0x00000001
str r1, [r0]
#endif /* IRQSTATS */
ldr r0, [r6, #(IH_ARG)] /* Get argument pointer */
teq r0, #0x00000000 /* If arg is zero pass stack frame */
addeq r0, sp, #8 /* ... stack frame */
ldr pc, [r6, #(IH_FUNC)] /* Call handler */
nextinchain:
teq r0, #0x00000001 /* Was the irq serviced ? */
beq irqdone
ldr r6, [r6, #(IH_NEXT)]
teq r6, #0x00000000
bne irqchainloop
irqdone:
nextirq:
add r7, r7, #0x00000004 /* update pointer to handlers */
mov r9, r9, lsl #1 /* move on to next bit */
#ifdef CPU_ARM7500
teq r9, #0 /* done the last bit ? */
#else
teq r9, #(1 << 24) /* done the last bit ? */
#endif /* CPU_ARM7500 */
bne irqloop /* no - loop back. */
ldmfd sp!, {r8}
/* Restore previous disabled mask */
ldmfd sp!, {r2}
ldr r1, Ldisabled_mask
str r2, [r1]
bl _irq_setmasks
bl _dosoftints /* Handle the soft interrupts */
/* Manage AST's. Maybe this should be done as a soft interrupt ? */
ldr r0, [sp] /* Get the SPSR from stack */
and r0, r0, #(PSR_MODE) /* Test for USR32 mode before the IRQ */
teq r0, #(PSR_USR32_MODE)
ldreq r0, Lastpending /* Do we have an AST pending ? */
ldreq r1, [r0]
teqeq r1, #0x00000001
beq irqast /* call the AST handler */
/* Kill IRQ's in preparation for exit */
mrs r0, cpsr_all
orr r0, r0, #(I32_bit)
msr cpsr_all, r0
/* Decrement the nest count */
ldr r0, Lcurrent_intr_depth
ldr r1, [r0]
sub r1, r1, #1
str r1, [r0]
PULLFRAMEFROMSVCANDEXIT
movs pc, lr /* Exit */
/*
* Ok, snag with current intr depth ...
* If ast() calls mi_sleep() the current_intr_depth will not be
* decremented until the process is woken up. This can result
* in the system believing it is still in the interrupt handler.
* If we are calling ast() then correct the current_intr_depth
* before the call.
*/
irqast:
mov r1, #0x00000000 /* Clear ast_pending */
str r1, [r0]
/* Kill IRQ's so we atomically decrement current_intr_depth */
mrs r2, cpsr_all
orr r3, r2, #(I32_bit)
msr cpsr_all, r3
/* Decrement the nest count */
ldr r0, Lcurrent_intr_depth
ldr r1, [r0]
sub r1, r1, #1
str r1, [r0]
/* Restore IRQ's */
msr cpsr_all, r2
mov r0, sp
bl _ast
/* Kill IRQ's in preparation for exit */
mrs r0, cpsr_all
orr r0, r0, #(I32_bit)
msr cpsr_all, r0
PULLFRAMEFROMSVCANDEXIT
movs pc, lr /* Exit */
Lspl_mask:
.word _spl_mask /* irq's allowed at current spl level */
Lcurrent_mask:
.word _current_mask /* irq's that are usable */
Lirqblock:
.word _irqblock
.global _irq_setmasks
_irq_setmasks:
/* Disable interrupts */
mrs r3, cpsr_all
orr r1, r3, #(I32_bit)
msr cpsr_all, r1
/* Calculate IOMD interrupt mask */
ldr r1, Lcurrent_mask /* All the enabled interrupts */
ldr r1, [r1]
ldr r2, Lspl_mask /* Block due to current spl level */
ldr r2, [r2]
and r1, r1, r2
ldr r2, Ldisabled_mask /* Block due to active interrupts */
ldr r2, [r2]
bic r1, r1, r2
mov r0, #(IOMD_BASE) /* Point to the IOMD */
strb r1, [r0, #(IOMD_IRQMSKA << 2)] /* Set IRQ mask A */
mov r1, r1, lsr #8
strb r1, [r0, #(IOMD_IRQMSKB << 2)] /* Set IRQ mask B */
mov r1, r1, lsr #8
#ifdef CPU_ARM7500
strb r1, [r0, #(IOMD_IRQMSKC << 2)]
mov r1, r1, lsr #8
and r2, r1, #0xef
strb r2, [r0, #(IOMD_IRQMSKD << 2)]
mov r1, r1, lsr #3
and r2, r1, #0x10
strb r2, [r0, #(IOMD_DMAMSK << 2)] /* Set DMA mask */
#else
strb r1, [r0, #(IOMD_DMAMSK << 2)] /* Set DMA mask */
#endif /* CPU_ARM7500 */
/* Restore old cpsr and exit */
msr cpsr_all, r3
mov pc, lr
Lcnt:
.word _cnt
Lintrcnt:
.word _intrcnt
irqhandlers:
.word _irqhandlers /* Pointer to array of irqhandlers */
Lastpending:
.word _astpending
#ifdef IRQSTATS
/* These symbols are used by vmstat */
.text
.global __intrnames
__intrnames:
.word _intrnames
.data
.globl _intrnames, _eintrnames, _intrcnt, _eintrcnt
_intrnames:
.asciz "interrupt 0 "
.asciz "softnet " /* reserved0 */
.asciz "interrupt 2 "
.asciz "interrupt 3 "
.asciz "interrupt 4 "
.asciz "interrupt 5 "
.asciz "interrupt 6 "
.asciz "softclock " /* reserved1 */
.asciz "softplip " /* reserved2 */
.asciz "interrupt 9 "
.asciz "interrupt 10 "
.asciz "interrupt 11 "
.asciz "interrupt 12 "
.asciz "interrupt 13 "
.asciz "interrupt 14 "
.asciz "interrupt 15 "
.asciz "dma channel 0"
.asciz "dma channel 1"
.asciz "dma channel 2"
.asciz "dma channel 3"
.asciz "interrupt 20 "
.asciz "interrupt 21 "
.asciz "reserved 3 "
.asciz "reserved 4 "
.asciz "exp card 0 "
.asciz "exp card 1 "
.asciz "exp card 2 "
.asciz "exp card 3 "
.asciz "exp card 4 "
.asciz "exp card 5 "
.asciz "exp card 6 "
.asciz "exp card 7 "
_eintrnames:
.bss
.align 0
_intrcnt:
.space 32*4 /* XXX Should be linked to number of interrupts */
_eintrcnt:
#else /* IRQSTATS */
/* Dummy entries to keep vmstat happy */
.text
.globl _intrnames, _eintrnames, _intrcnt, _eintrcnt
_intrnames:
.long 0
_eintrnames:
_intrcnt:
.long 0
_eintrcnt:
#endif /* IRQSTATS */
/* FIQ code */
.text
.align 0
.global _fiq_setregs /* Sets up the FIQ handler */
_fiq_setregs:
mrs r2, cpsr_all
mov r3, r2
bic r2, r2, #(PSR_MODE)
orr r2, r2, #(PSR_FIQ32_MODE)
msr cpsr_all, r2
ldr r8, [r0, #FH_R8] /* Update FIQ registers*/
ldr r9, [r0, #FH_R9]
ldr r10, [r0, #FH_R10]
ldr r11, [r0, #FH_R11]
ldr r12, [r0, #FH_R12]
ldr r13, [r0, #FH_R13]
msr cpsr_all, r3 /* Back to old mode */
mov pc, lr /* Exit */
.global _fiq_getregs /* Gets the FIQ registers */
_fiq_getregs:
mrs r2, cpsr_all
mov r3, r2
bic r2, r2, #(PSR_MODE)
orr r2, r2, #(PSR_FIQ32_MODE)
msr cpsr_all, r2
str r8, [r0, #FH_R8] /* Update FIQ registers*/
str r9, [r0, #FH_R9]
str r10, [r0, #FH_R10]
str r11, [r0, #FH_R11]
str r12, [r0, #FH_R12]
str r13, [r0, #FH_R13]
msr cpsr_all, r3 /* Back to old mode */
mov pc, lr /* Exit */
/* End of irq.S */
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