/* $OpenBSD: pxa2x0_intr.c,v 1.23 2012/12/05 23:20:11 deraadt Exp $ */ /* $NetBSD: pxa2x0_intr.c,v 1.5 2003/07/15 00:24:55 lukem Exp $ */ /* * Copyright (c) 2002 Genetec Corporation. All rights reserved. * Written by Hiroyuki Bessho for Genetec Corporation. * * 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 for the NetBSD Project by * Genetec Corporation. * 4. The name of Genetec Corporation may not be used to endorse or * promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY GENETEC CORPORATION ``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 GENETEC CORPORATION * 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. */ /* * IRQ handler for the Intel PXA2X0 processor. * It has integrated interrupt controller. */ #include #include #include #include #include #include #include #include #include #include #include #include #include /* * INTC autoconf glue */ int pxaintc_match(struct device *, void *, void *); void pxaintc_attach(struct device *, struct device *, void *); #ifdef __NetBSD__ CFATTACH_DECL(pxaintc, sizeof(struct device), pxaintc_match, pxaintc_attach, NULL, NULL); #else struct cfattach pxaintc_ca = { sizeof(struct device), pxaintc_match, pxaintc_attach }; struct cfdriver pxaintc_cd = { NULL, "pxaintc", DV_DULL }; #endif static int pxaintc_attached; int pxa2x0_stray_interrupt(void *); void pxa2x0_init_interrupt_masks(void); /* * interrupt dispatch table. */ #if 1 #define MULTIPLE_HANDLERS_ON_ONE_IRQ #endif #ifdef MULTIPLE_HANDLERS_ON_ONE_IRQ struct intrhand { TAILQ_ENTRY(intrhand) ih_list; /* link on intrq list */ int (*ih_func)(void *); /* handler */ void *ih_arg; /* arg for handler */ char *ih_name; struct evcount ih_count; int ih_irq; int ih_level; }; #endif static struct intrhandler{ #ifdef MULTIPLE_HANDLERS_ON_ONE_IRQ TAILQ_HEAD(,intrhand) list; #else pxa2x0_irq_handler_t func; char *name; void *arg; /* NULL for stackframe */ int ih_irq; struct evcount ih_count; #endif } handler[ICU_LEN]; __volatile int softint_pending; __volatile int current_spl_level; /* interrupt masks for each level */ int pxa2x0_imask[NIPL]; static int extirq_level[ICU_LEN]; int pxaintc_match(struct device *parent, void *cf, void *aux) { struct pxaip_attach_args *pxa = aux; if (pxaintc_attached || pxa->pxa_addr != PXA2X0_INTCTL_BASE) return (0); return (1); } void pxaintc_attach(struct device *parent, struct device *self, void *args) { int i; pxaintc_attached = 1; printf(": Interrupt Controller\n"); #define SAIPIC_ICCR 0x14 write_icu(SAIPIC_ICCR, 1); write_icu(SAIPIC_MR, 0); for(i = 0; i < sizeof handler / sizeof handler[0]; ++i){ #ifdef MULTIPLE_HANDLERS_ON_ONE_IRQ TAILQ_INIT(&handler[i].list); extirq_level[i] = IPL_NONE; #else handler[i].name = "stray"; handler[i].func = pxa2x0_stray_interrupt; handler[i].arg = (void *)(u_int32_t) i; extirq_level[i] = IPL_HIGH; #endif } pxa2x0_init_interrupt_masks(); _splraise(IPL_HIGH); enable_interrupts(I32_bit); } /* * Invoked very early on from the board-specific initarm(), in order to * inform us the virtual address of the interrupt controller's registers. */ vaddr_t pxaic_base; void pxa2x0_intr_bootstrap(vaddr_t addr) { pxaic_base = addr; } /* * PXA27x has MSL interface and SSP3 interrupts [0,1], USIM interface * and SSP2 interrupts [15,16]. PXA255 has bits [0..6,15] reserved and * bit [16] network SSP interrupt. We don't need any of those, so we * map software interrupts to bits [0..1,15..16]. Sadly there are no * four contiguous bits safe enough to use on both processors. */ #define SI_TO_IRQBIT(si) ((si) < 2 ? 1U<<(si) : 1U<<(15-2+(si))) /* * Map a software interrupt queue to an interrupt priority level. */ static const int si_to_ipl[SI_NQUEUES] = { IPL_SOFT, /* SI_SOFT */ IPL_SOFTCLOCK, /* SI_SOFTCLOCK */ IPL_SOFTNET, /* SI_SOFTNET */ IPL_SOFTTTY, /* SI_SOFTTTY */ }; /* * called from irq_entry. */ void pxa2x0_irq_handler(void *arg) { struct clockframe *frame = arg; uint32_t irqbits; int irqno; int saved_spl_level; #ifdef MULTIPLE_HANDLERS_ON_ONE_IRQ struct intrhand *ih; #endif saved_spl_level = current_spl_level; /* get pending IRQs */ irqbits = read_icu(SAIPIC_IP); while ((irqno = find_first_bit(irqbits)) >= 0) { /* XXX: Should we handle IRQs in priority order? */ /* raise spl to stop interrupts of lower priorities */ if (saved_spl_level < extirq_level[irqno]) pxa2x0_setipl(extirq_level[irqno]); /* Enable interrupt */ enable_interrupts(I32_bit); #ifndef MULTIPLE_HANDLERS_ON_ONE_IRQ (* handler[irqno].func)( handler[irqno].arg == 0 ? frame : handler[irqno].arg ); handler[irqno].ih_count.ec_count++; #else TAILQ_FOREACH(ih, &handler[irqno].list, ih_list) { if ((ih->ih_func)( ih->ih_arg == 0 ? frame : ih->ih_arg)) ih->ih_count.ec_count++; } #endif /* Disable interrupt */ disable_interrupts(I32_bit); irqbits &= ~(1<ih_level > max) max = ih->ih_level; if (ih->ih_level < min) min = ih->ih_level; } extirq_level[irq] = max; if (min == IPL_HIGH) min = IPL_NONE; /* Enable interrupt at lower level */ for(i = 0; i < min; ++i) pxa2x0_imask[i] |= (1 << irq); /* Disable interrupt at upper level */ for( ; i < NIPL; ++i) pxa2x0_imask[i] &= ~(1 << irq); } /* fixup */ pxa2x0_imask[IPL_NONE] |= SI_TO_IRQBIT(SI_SOFT) | SI_TO_IRQBIT(SI_SOFTCLOCK) | SI_TO_IRQBIT(SI_SOFTNET) | SI_TO_IRQBIT(SI_SOFTTTY); pxa2x0_imask[IPL_SOFT] |= SI_TO_IRQBIT(SI_SOFTCLOCK) | SI_TO_IRQBIT(SI_SOFTNET) | SI_TO_IRQBIT(SI_SOFTTTY); pxa2x0_imask[IPL_SOFTCLOCK] |= SI_TO_IRQBIT(SI_SOFTNET) | SI_TO_IRQBIT(SI_SOFTTTY); pxa2x0_imask[IPL_SOFTNET] |= SI_TO_IRQBIT(SI_SOFTTTY); pxa2x0_imask[IPL_SOFTTTY] |= 0; #else int level; /* debug */ int mask = 1U<ih_level > max_irq) max_irq = ih->ih_level; } extirq_level[irq] = max_irq; } #endif write_icu(SAIPIC_MR, pxa2x0_imask[current_spl_level]); restore_interrupts(psw); } void pxa2x0_init_interrupt_masks(void) { memset(pxa2x0_imask, 0, sizeof(pxa2x0_imask)); /* * IPL_NONE has soft interrupts enabled only, at least until * hardware handlers are installed. */ pxa2x0_imask[IPL_NONE] = SI_TO_IRQBIT(SI_SOFT) | SI_TO_IRQBIT(SI_SOFTCLOCK) | SI_TO_IRQBIT(SI_SOFTNET) | SI_TO_IRQBIT(SI_SOFTTTY); /* * Initialize the soft interrupt masks to block themselves. */ pxa2x0_imask[IPL_SOFT] = ~SI_TO_IRQBIT(SI_SOFT); pxa2x0_imask[IPL_SOFTCLOCK] = ~SI_TO_IRQBIT(SI_SOFTCLOCK); pxa2x0_imask[IPL_SOFTNET] = ~SI_TO_IRQBIT(SI_SOFTNET); pxa2x0_imask[IPL_SOFTTTY] = ~SI_TO_IRQBIT(SI_SOFTTTY); pxa2x0_imask[IPL_SOFT] &= pxa2x0_imask[IPL_NONE]; /* * splsoftclock() is the only interface that users of the * generic software interrupt facility have to block their * soft intrs, so splsoftclock() must also block IPL_SOFT. */ pxa2x0_imask[IPL_SOFTCLOCK] &= pxa2x0_imask[IPL_SOFT]; /* * splsoftnet() must also block splsoftclock(), since we don't * want timer-driven network events to occur while we're * processing incoming packets. */ pxa2x0_imask[IPL_SOFTNET] &= pxa2x0_imask[IPL_SOFTCLOCK]; } void pxa2x0_do_pending(void) { static __cpu_simple_lock_t processing = __SIMPLELOCK_UNLOCKED; int oldirqstate, spl_save; if (__cpu_simple_lock_try(&processing) == 0) return; spl_save = current_spl_level; oldirqstate = disable_interrupts(I32_bit); #if 1 #define DO_SOFTINT(si,ipl) \ if ((softint_pending & pxa2x0_imask[current_spl_level]) & \ SI_TO_IRQBIT(si)) { \ softint_pending &= ~SI_TO_IRQBIT(si); \ if (current_spl_level < ipl) \ pxa2x0_setipl(ipl); \ restore_interrupts(oldirqstate); \ softintr_dispatch(si); \ oldirqstate = disable_interrupts(I32_bit); \ pxa2x0_setipl(spl_save); \ } do { DO_SOFTINT(SI_SOFTTTY,IPL_SOFTTTY); DO_SOFTINT(SI_SOFTNET, IPL_SOFTNET); DO_SOFTINT(SI_SOFTCLOCK, IPL_SOFTCLOCK); DO_SOFTINT(SI_SOFT, IPL_SOFT); } while( softint_pending & pxa2x0_imask[current_spl_level] ); #else while( (si = find_first_bit(softint_pending & pxa2x0_imask[current_spl_level])) >= 0 ){ softint_pending &= ~SI_TO_IRQBIT(si); if (current_spl_level < ipl) pxa2x0_setipl(ipl); restore_interrupts(oldirqstate); softintr_dispatch(si); oldirqstate = disable_interrupts(I32_bit); pxa2x0_setipl(spl_save); } #endif __cpu_simple_unlock(&processing); restore_interrupts(oldirqstate); } #undef splx void splx(int ipl) { pxa2x0_splx(ipl); } #undef _splraise int _splraise(int ipl) { return pxa2x0_splraise(ipl); } #undef _spllower int _spllower(int ipl) { return pxa2x0_spllower(ipl); } #undef _setsoftintr void _setsoftintr(int si) { return pxa2x0_setsoftintr(si); } void * pxa2x0_intr_establish(int irqno, int level, int (*func)(void *), void *arg, const char *name) { int psw; #ifdef MULTIPLE_HANDLERS_ON_ONE_IRQ struct intrhand *ih; #else struct intrhandler *ih; #endif if (irqno < PXA2X0_IRQ_MIN || irqno >= ICU_LEN) panic("intr_establish: bogus irq number %d", irqno); psw = disable_interrupts(I32_bit); #ifdef MULTIPLE_HANDLERS_ON_ONE_IRQ /* no point in sleeping unless someone can free memory. */ ih = (struct intrhand *)malloc(sizeof *ih, M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); if (ih == NULL) panic("intr_establish: can't malloc handler info"); ih->ih_func = func; ih->ih_arg = arg; ih->ih_level = level; ih->ih_irq = irqno; TAILQ_INSERT_TAIL(&handler[irqno].list, ih, ih_list); #else ih = &handler[irqno]; ih->arg = arg; ih->func = func; ih->name = name; ih->ih_irq = irqno; extirq_level[irqno] = level; #endif if (name != NULL) evcount_attach(&ih->ih_count, name, &ih->ih_irq); #ifdef MULTIPLE_HANDLERS_ON_ONE_IRQ pxa2x0_update_intr_masks(); #else pxa2x0_update_intr_masks(irqno, level); #endif restore_interrupts(psw); return (ih); } void pxa2x0_intr_disestablish(void *cookie) { #ifdef MULTIPLE_HANDLERS_ON_ONE_IRQ int psw; struct intrhand *ih = cookie; int irqno = ih->ih_irq; psw = disable_interrupts(I32_bit); TAILQ_REMOVE(&handler[irqno].list, ih, ih_list); free(ih, M_DEVBUF); pxa2x0_update_intr_masks(); restore_interrupts(psw); #else struct intrhandler *lhandler = cookie; int irqno; int psw; struct intrhandler *ih; irqno = lhandler - handler; if (irqno < PXA2X0_IRQ_MIN || irqno >= ICU_LEN) panic("intr_disestablish: bogus irq number %d", irqno); psw = disable_interrupts(I32_bit); ih = &handler[irqno]; if (ih->name != NULL) evcount_detach(&ih->ih_count); ih->arg = (void *) irqno; ih->func = pxa2x0_stray_interrupt; ih->name = "stray"; extirq_level[irqno] = IPL_HIGH; pxa2x0_update_intr_masks(irqno, IPL_HIGH); restore_interrupts(psw); #endif } /* * Glue for drivers of sa11x0 compatible integrated logic. */ void * sa11x0_intr_establish(sa11x0_chipset_tag_t ic, int irq, int type, int level, int (*ih_fun)(void *), void *ih_arg, const char *name) { return pxa2x0_intr_establish(irq, level, ih_fun, ih_arg, name); } void pxa2x0_setipl(int new) { u_int32_t intr_mask; intr_mask = pxa2x0_imask[new]; current_spl_level = new; write_icu( SAIPIC_MR, intr_mask ); } void pxa2x0_splx(int new) { int psw; psw = disable_interrupts(I32_bit); pxa2x0_setipl(new); restore_interrupts(psw); /* If there are pending software interrupts, process them. */ if (softint_pending & pxa2x0_imask[current_spl_level]) pxa2x0_do_pending(); } int pxa2x0_splraise(int ipl) { int old, psw; old = current_spl_level; if( ipl > current_spl_level ){ psw = disable_interrupts(I32_bit); pxa2x0_setipl(ipl); restore_interrupts(psw); } return (old); } int pxa2x0_spllower(int ipl) { int old = current_spl_level; int psw = disable_interrupts(I32_bit); pxa2x0_splx(ipl); restore_interrupts(psw); return(old); } void pxa2x0_setsoftintr(int si) { softint_pending |= SI_TO_IRQBIT(si); /* Process unmasked pending soft interrupts. */ if ( softint_pending & pxa2x0_imask[current_spl_level] ) pxa2x0_do_pending(); } const char * pxa2x0_intr_string(void *cookie) { #ifdef MULTIPLE_HANDLERS_ON_ONE_IRQ struct intrhand *ih = cookie; #else struct intrhandler *lhandler = cookie; #endif static char irqstr[32]; if (ih == NULL) snprintf(irqstr, sizeof irqstr, "couldn't establish interrupt"); else snprintf(irqstr, sizeof irqstr, "irq %ld", ih->ih_irq); return irqstr; } #ifdef DIAGNOSTIC void pxa2x0_splassert_check(int wantipl, const char *func) { int oldipl = current_spl_level, psw; if (oldipl < wantipl) { splassert_fail(wantipl, oldipl, func); /* * If the splassert_ctl is set to not panic, raise the ipl * in a feeble attempt to reduce damage. */ psw = disable_interrupts(I32_bit); pxa2x0_setipl(wantipl); restore_interrupts(psw); } } #endif