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ixp12x0_intr.c revision 1.15.30.2 
      1 /* $NetBSD: ixp12x0_intr.c,v 1.15.30.2 2008/01/09 01:45:20 matt Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Ichiro FUKUHARA and Naoto Shimazaki.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 __KERNEL_RCSID(0, "$NetBSD: ixp12x0_intr.c,v 1.15.30.2 2008/01/09 01:45:20 matt Exp $");
     41 
     42 /*
     43  * Interrupt support for the Intel ixp12x0
     44  */
     45 
     46 #include <sys/param.h>
     47 #include <sys/systm.h>
     48 #include <sys/malloc.h>
     49 #include <sys/simplelock.h>
     50 #include <sys/termios.h>
     51 
     52 #include <uvm/uvm_extern.h>
     53 
     54 #include <machine/bus.h>
     55 #include <machine/intr.h>
     56 
     57 #include <arm/cpufunc.h>
     58 
     59 #include <arm/ixp12x0/ixp12x0reg.h>
     60 #include <arm/ixp12x0/ixp12x0var.h>
     61 #include <arm/ixp12x0/ixp12x0_comreg.h>
     62 #include <arm/ixp12x0/ixp12x0_comvar.h>
     63 #include <arm/ixp12x0/ixp12x0_pcireg.h>
     64 
     65 
     66 extern u_int32_t	ixpcom_cr;	/* current cr from *_com.c */
     67 extern u_int32_t	ixpcom_imask;	/* tell mask to *_com.c */
     68 
     69 /* Interrupt handler queues. */
     70 struct intrq intrq[NIRQ];
     71 
     72 /* Interrupts to mask at each level. */
     73 static u_int32_t imask[NIPL];
     74 static u_int32_t pci_imask[NIPL];
     75 
     76 /* Current interrupt priority level. */
     77 volatile int hardware_spl_level;
     78 
     79 /* Software copy of the IRQs we have enabled. */
     80 volatile u_int32_t intr_enabled;
     81 volatile u_int32_t pci_intr_enabled;
     82 
     83 /* Interrupts pending. */
     84 static volatile int ipending;
     85 
     86 #ifdef __HAVE_FAST_SOFTINTS
     87 /*
     88  * Map a software interrupt queue index (to the unused bits in the
     89  * ICU registers -- XXX will need to revisit this if those bits are
     90  * ever used in future steppings).
     91  */
     92 static const u_int32_t si_to_irqbit[SI_NQUEUES] = {
     93 	IXP12X0_INTR_bit30,		/* SI_SOFT */
     94 	IXP12X0_INTR_bit29,		/* SI_SOFTCLOCK */
     95 	IXP12X0_INTR_bit28,		/* SI_SOFTNET */
     96 	IXP12X0_INTR_bit27,		/* SI_SOFTSERIAL */
     97 };
     98 
     99 #define	INT_SWMASK							\
    100 	((1U << IXP12X0_INTR_bit30) | (1U << IXP12X0_INTR_bit29) |	\
    101 	 (1U << IXP12X0_INTR_bit28) | (1U << IXP12X0_INTR_bit27))
    102 
    103 #define	SI_TO_IRQBIT(si)	(1U << si_to_irqbit[(si)])
    104 
    105 /*
    106  * Map a software interrupt queue to an interrupt priority level.
    107  */
    108 static const int si_to_ipl[] = {
    109 	[SI_SOFTBIO] =		IPL_SOFTBIO,
    110 	[SI_SOFTCLOCK] =	IPL_SOFTCLOCK,
    111 	[SI_SOFTNET] =		IPL_SOFTNET,
    112 	[SI_SOFTSERIAL] =	IPL_SOFTSERIAL,
    113 };
    114 #endif /* __HAVE_FAST_SOFTINTS */
    115 
    116 void	ixp12x0_intr_dispatch(struct irqframe *frame);
    117 
    118 #define IXPREG(reg)	*((volatile u_int32_t*) (reg))
    119 
    120 static inline u_int32_t
    121 ixp12x0_irq_read(void)
    122 {
    123 	return IXPREG(IXP12X0_IRQ_VBASE) & IXP12X0_INTR_MASK;
    124 }
    125 
    126 static inline u_int32_t
    127 ixp12x0_pci_irq_read(void)
    128 {
    129 	return IXPREG(IXPPCI_IRQ_STATUS);
    130 }
    131 
    132 static void
    133 ixp12x0_enable_uart_irq(void)
    134 {
    135 	ixpcom_imask = 0;
    136 	if (ixpcom_sc)
    137 		bus_space_write_4(ixpcom_sc->sc_iot, ixpcom_sc->sc_ioh,
    138 				  IXPCOM_CR, ixpcom_cr & ~ixpcom_imask);
    139 }
    140 
    141 static void
    142 ixp12x0_disable_uart_irq(void)
    143 {
    144 	ixpcom_imask = CR_RIE | CR_XIE;
    145 	if (ixpcom_sc)
    146 		bus_space_write_4(ixpcom_sc->sc_iot, ixpcom_sc->sc_ioh,
    147 				  IXPCOM_CR, ixpcom_cr & ~ixpcom_imask);
    148 }
    149 
    150 static void
    151 ixp12x0_set_intrmask(u_int32_t irqs, u_int32_t pci_irqs)
    152 {
    153 	if (irqs & (1U << IXP12X0_INTR_UART)) {
    154 		ixp12x0_disable_uart_irq();
    155 	} else {
    156 		ixp12x0_enable_uart_irq();
    157 	}
    158 	IXPREG(IXPPCI_IRQ_ENABLE_CLEAR) = pci_irqs;
    159 	IXPREG(IXPPCI_IRQ_ENABLE_SET) = pci_intr_enabled & ~pci_irqs;
    160 }
    161 
    162 static void
    163 ixp12x0_enable_irq(int irq)
    164 {
    165 	if (irq < SYS_NIRQ) {
    166 		intr_enabled |= (1U << irq);
    167 		switch (irq) {
    168 		case IXP12X0_INTR_UART:
    169 			ixp12x0_enable_uart_irq();
    170 			break;
    171 
    172 		case IXP12X0_INTR_PCI:
    173 			/* nothing to do */
    174 			break;
    175 		default:
    176 			panic("enable_irq:bad IRQ %d", irq);
    177 		}
    178 	} else {
    179 		pci_intr_enabled |= (1U << (irq - SYS_NIRQ));
    180 		IXPREG(IXPPCI_IRQ_ENABLE_SET) = (1U << (irq - SYS_NIRQ));
    181 	}
    182 }
    183 
    184 static inline void
    185 ixp12x0_disable_irq(int irq)
    186 {
    187 	if (irq < SYS_NIRQ) {
    188 		intr_enabled ^= ~(1U << irq);
    189 		switch (irq) {
    190 		case IXP12X0_INTR_UART:
    191 			ixp12x0_disable_uart_irq();
    192 			break;
    193 
    194 		case IXP12X0_INTR_PCI:
    195 			/* nothing to do */
    196 			break;
    197 		default:
    198 			/* nothing to do */
    199 			break;
    200 		}
    201 	} else {
    202 		pci_intr_enabled &= ~(1U << (irq - SYS_NIRQ));
    203 		IXPREG(IXPPCI_IRQ_ENABLE_CLEAR) = (1U << (irq - SYS_NIRQ));
    204 	}
    205 }
    206 
    207 /*
    208  * NOTE: This routine must be called with interrupts disabled in the CPSR.
    209  */
    210 static void
    211 ixp12x0_intr_calculate_masks(void)
    212 {
    213 	struct intrq *iq;
    214 	struct intrhand *ih;
    215 	int irq, ipl;
    216 
    217 	/* First, figure out which IPLs each IRQ has. */
    218 	for (irq = 0; irq < NIRQ; irq++) {
    219 		int levels = 0;
    220 		iq = &intrq[irq];
    221 		ixp12x0_disable_irq(irq);
    222 		for (ih = TAILQ_FIRST(&iq->iq_list); ih != NULL;
    223 		     ih = TAILQ_NEXT(ih, ih_list))
    224 			levels |= (1U << ih->ih_ipl);
    225 		iq->iq_levels = levels;
    226 	}
    227 
    228 	/* Next, figure out which IRQs are used by each IPL. */
    229 	for (ipl = 0; ipl < NIPL; ipl++) {
    230 		int irqs = 0;
    231 		int pci_irqs = 0;
    232 		for (irq = 0; irq < SYS_NIRQ; irq++) {
    233 			if (intrq[irq].iq_levels & (1U << ipl))
    234 				irqs |= (1U << irq);
    235 		}
    236 		imask[ipl] = irqs;
    237 		for (irq = 0; irq < SYS_NIRQ; irq++) {
    238 			if (intrq[irq + SYS_NIRQ].iq_levels & (1U << ipl))
    239 				pci_irqs |= (1U << irq);
    240 		}
    241 		pci_imask[ipl] = pci_irqs;
    242 	}
    243 
    244 	KASSERT(imask[IPL_NONE] == 0);
    245 	KASSERT(pci_imask[IPL_NONE] == 0);
    246 
    247 #ifdef __HAVE_FAST_SOFTINTS
    248 	/*
    249 	 * Initialize the soft interrupt masks to block themselves.
    250 	 */
    251 	imask[IPL_SOFTBIO] = SI_TO_IRQBIT(SI_SOFTBIO);
    252 	imask[IPL_SOFTCLOCK] = SI_TO_IRQBIT(SI_SOFTCLOCK);
    253 	imask[IPL_SOFTNET] = SI_TO_IRQBIT(SI_SOFTNET);
    254 	imask[IPL_SOFTSERIAL] = SI_TO_IRQBIT(SI_SOFTSERIAL);
    255 #endif
    256 
    257 	/*
    258 	 * splsoftclock() is the only interface that users of the
    259 	 * generic software interrupt facility have to block their
    260 	 * soft intrs, so splsoftclock() must also block IPL_SOFT.
    261 	 */
    262 	imask[IPL_SOFTCLOCK] |= imask[IPL_SOFTBIO];
    263 	pci_imask[IPL_SOFTCLOCK] |= pci_imask[IPL_SOFTBIO];
    264 
    265 	/*
    266 	 * splsoftnet() must also block splsoftclock(), since we don't
    267 	 * want timer-driven network events to occur while we're
    268 	 * processing incoming packets.
    269 	 */
    270 	imask[IPL_SOFTNET] |= imask[IPL_SOFTCLOCK];
    271 	pci_imask[IPL_SOFTNET] |= pci_imask[IPL_SOFTCLOCK];
    272 
    273 	/*
    274 	 * Enforce a hierarchy that gives "slow" device (or devices with
    275 	 * limited input buffer space/"real-time" requirements) a better
    276 	 * chance at not dropping data.
    277 	 */
    278 	imask[IPL_SOFTSERIAL] |= imask[IPL_SOFTNET];
    279 	pci_imask[IPL_SOFTSERIAL] |= pci_imask[IPL_SOFTNET];
    280 
    281 	/*
    282 	 * splvm() blocks all interrupts that use the kernel memory
    283 	 * allocation facilities.
    284 	 */
    285 	imask[IPL_VM] |= imask[IPL_SOFTSERIAL];
    286 	pci_imask[IPL_VM] |= pci_imask[IPL_SOFTSERIAL];
    287 
    288 	/*
    289 	 * splclock() must block anything that uses the scheduler.
    290 	 */
    291 	imask[IPL_CLOCK] |= imask[IPL_VM];
    292 	pci_imask[IPL_CLOCK] |= pci_imask[IPL_VM];
    293 
    294 	/*
    295 	 * splhigh() must block "everything".
    296 	 */
    297 	imask[IPL_HIGH] |= imask[IPL_CLOCK];
    298 	pci_imask[IPL_HIGH] |= pci_imask[IPL_CLOCK];
    299 
    300 	/*
    301 	 * Now compute which IRQs must be blocked when servicing any
    302 	 * given IRQ.
    303 	 */
    304 	for (irq = 0; irq < NIRQ; irq++) {
    305 		int	irqs;
    306 		int	pci_irqs;
    307 
    308 		if (irq < SYS_NIRQ) {
    309 			irqs = (1U << irq);
    310 			pci_irqs = 0;
    311 		} else {
    312 			irqs = 0;
    313 			pci_irqs = (1U << (irq - SYS_NIRQ));
    314 		}
    315 		iq = &intrq[irq];
    316 		if (TAILQ_FIRST(&iq->iq_list) != NULL)
    317 			ixp12x0_enable_irq(irq);
    318 		for (ih = TAILQ_FIRST(&iq->iq_list); ih != NULL;
    319 		     ih = TAILQ_NEXT(ih, ih_list)) {
    320 			irqs |= imask[ih->ih_ipl];
    321 			pci_irqs |= pci_imask[ih->ih_ipl];
    322 		}
    323 		iq->iq_mask = irqs;
    324 		iq->iq_pci_mask = pci_irqs;
    325 	}
    326 }
    327 
    328 #ifdef __HAVE_FAST_SOFTINTS
    329 static void
    330 ixp12x0_do_pending(void)
    331 {
    332 	static __cpu_simple_lock_t processing = __SIMPLELOCK_UNLOCKED;
    333 	int	new;
    334 	u_int	oldirqstate;
    335 
    336 	if (__cpu_simple_lock_try(&processing) == 0)
    337 		return;
    338 
    339 	new = curcpl();
    340 
    341 	oldirqstate = disable_interrupts(I32_bit);
    342 
    343 #define	DO_SOFTINT(si)							\
    344 	if ((ipending & ~imask[new]) & SI_TO_IRQBIT(si)) {		\
    345 		ipending &= ~SI_TO_IRQBIT(si);				\
    346 		set_curcpl(si_to_ipl[(si)]);				\
    347 		restore_interrupts(oldirqstate);			\
    348 		softintr_dispatch(si);					\
    349 		oldirqstate = disable_interrupts(I32_bit);		\
    350 		set_curcpl(new);					\
    351 	}
    352 
    353 	DO_SOFTINT(SI_SOFTSERIAL);
    354 	DO_SOFTINT(SI_SOFTNET);
    355 	DO_SOFTINT(SI_SOFTCLOCK);
    356 	DO_SOFTINT(SI_SOFT);
    357 
    358 	__cpu_simple_unlock(&processing);
    359 
    360 	restore_interrupts(oldirqstate);
    361 }
    362 #endif
    363 
    364 inline void
    365 splx(int new)
    366 {
    367 	int	old;
    368 	u_int	oldirqstate;
    369 
    370 	oldirqstate = disable_interrupts(I32_bit);
    371 	old = curcpl();
    372 	set_curcpl(new);
    373 	if (new != hardware_spl_level) {
    374 		hardware_spl_level = new;
    375 		ixp12x0_set_intrmask(imask[new], pci_imask[new]);
    376 	}
    377 	restore_interrupts(oldirqstate);
    378 
    379 #ifdef __HAVE_FAST_SOFTINTS
    380 	/* If there are software interrupts to process, do it. */
    381 	if ((ipending & INT_SWMASK) & ~imask[new])
    382 		ixp12x0_do_pending();
    383 #endif
    384 }
    385 
    386 int
    387 _splraise(int ipl)
    388 {
    389 	int	old;
    390 	u_int	oldirqstate;
    391 
    392 	oldirqstate = disable_interrupts(I32_bit);
    393 	old = curcpl();
    394 	set_curcpl(ipl);
    395 	restore_interrupts(oldirqstate);
    396 	return (old);
    397 }
    398 
    399 int
    400 _spllower(int ipl)
    401 {
    402 	int	old = curcpl();
    403 
    404 	if (old <= ipl)
    405 		return (old);
    406 	splx(ipl);
    407 	return (old);
    408 }
    409 
    410 #ifdef __HAVE_FAST_SOFTINTS
    411 void
    412 _setsoftintr(int si)
    413 {
    414 	u_int	oldirqstate;
    415 
    416 	oldirqstate = disable_interrupts(I32_bit);
    417 	ipending |= SI_TO_IRQBIT(si);
    418 	restore_interrupts(oldirqstate);
    419 
    420 	/* Process unmasked pending soft interrupts. */
    421 	if ((ipending & INT_SWMASK) & ~imask[curcpl()])
    422 		ixp12x0_do_pending();
    423 }
    424 #endif
    425 
    426 /*
    427  * ixp12x0_intr_init:
    428  *
    429  *	Initialize the rest of the interrupt subsystem, making it
    430  *	ready to handle interrupts from devices.
    431  */
    432 void
    433 ixp12x0_intr_init(void)
    434 {
    435 	struct intrq *iq;
    436 	int i;
    437 
    438 	intr_enabled = 0;
    439 	pci_intr_enabled = 0;
    440 
    441 	for (i = 0; i < NIRQ; i++) {
    442 		iq = &intrq[i];
    443 		TAILQ_INIT(&iq->iq_list);
    444 
    445 		sprintf(iq->iq_name, "ipl %d", i);
    446 		evcnt_attach_dynamic(&iq->iq_ev, EVCNT_TYPE_INTR,
    447 				     NULL, "ixpintr", iq->iq_name);
    448 	}
    449 	curcpu()->ci_intr_depth = 0;
    450 	curcpu()->ci_cpl = 0;
    451 	hardware_spl_level = 0;
    452 
    453 	ixp12x0_intr_calculate_masks();
    454 
    455 	/* Enable IRQs (don't yet use FIQs). */
    456 	enable_interrupts(I32_bit);
    457 }
    458 
    459 void *
    460 ixp12x0_intr_establish(int irq, int ipl, int (*ih_func)(void *), void *arg)
    461 {
    462 	struct intrq*		iq;
    463 	struct intrhand*	ih;
    464 	u_int			oldirqstate;
    465 #ifdef DEBUG
    466 	printf("ixp12x0_intr_establish(irq=%d, ipl=%d, ih_func=%08x, arg=%08x)\n",
    467 	       irq, ipl, (u_int32_t) ih_func, (u_int32_t) arg);
    468 #endif
    469 	if (irq < 0 || irq > NIRQ)
    470 		panic("ixp12x0_intr_establish: IRQ %d out of range", ipl);
    471 	if (ipl < 0 || ipl > NIPL)
    472 		panic("ixp12x0_intr_establish: IPL %d out of range", ipl);
    473 
    474 	ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT);
    475 	if (ih == NULL)
    476 		return (NULL);
    477 
    478 	ih->ih_func = ih_func;
    479 	ih->ih_arg = arg;
    480 	ih->ih_irq = irq;
    481 	ih->ih_ipl = ipl;
    482 
    483 	iq = &intrq[irq];
    484 	iq->iq_ist = IST_LEVEL;
    485 
    486 	oldirqstate = disable_interrupts(I32_bit);
    487 	TAILQ_INSERT_TAIL(&iq->iq_list, ih, ih_list);
    488 	ixp12x0_intr_calculate_masks();
    489 	restore_interrupts(oldirqstate);
    490 
    491 	return (ih);
    492 }
    493 
    494 void
    495 ixp12x0_intr_disestablish(void *cookie)
    496 {
    497 	struct intrhand*	ih = cookie;
    498 	struct intrq*		iq = &intrq[ih->ih_ipl];
    499 	u_int			oldirqstate;
    500 
    501 	oldirqstate = disable_interrupts(I32_bit);
    502 	TAILQ_REMOVE(&iq->iq_list, ih, ih_list);
    503 	ixp12x0_intr_calculate_masks();
    504 	restore_interrupts(oldirqstate);
    505 }
    506 
    507 void
    508 ixp12x0_intr_dispatch(struct irqframe *frame)
    509 {
    510 	struct intrq*		iq;
    511 	struct intrhand*	ih;
    512 	u_int			oldirqstate;
    513 	int			pcpl;
    514 	u_int32_t		hwpend;
    515 	u_int32_t		pci_hwpend;
    516 	int			irq;
    517 	u_int32_t		ibit;
    518 
    519 	pcpl = curcpl();
    520 
    521 	hwpend = ixp12x0_irq_read();
    522 	pci_hwpend = ixp12x0_pci_irq_read();
    523 
    524 	hardware_spl_level = pcpl;
    525 	ixp12x0_set_intrmask(imask[pcpl] | hwpend,
    526 			     pci_imask[pcpl] | pci_hwpend);
    527 
    528 	hwpend &= ~imask[pcpl];
    529 	pci_hwpend &= ~pci_imask[pcpl];
    530 
    531 	while (hwpend) {
    532 		irq = ffs(hwpend) - 1;
    533 		ibit = (1U << irq);
    534 
    535 		iq = &intrq[irq];
    536 		iq->iq_ev.ev_count++;
    537 		uvmexp.intrs++;
    538 		for (ih = TAILQ_FIRST(&iq->iq_list); ih != NULL;
    539 		     ih = TAILQ_NEXT(ih, ih_list)) {
    540 			int	ipl;
    541 
    542 			curcpu()->ci_cpl = ipl = ih->ih_ipl;
    543 			oldirqstate = enable_interrupts(I32_bit);
    544 			(void) (*ih->ih_func)(ih->ih_arg ? ih->ih_arg : frame);
    545 			restore_interrupts(oldirqstate);
    546 			hwpend &= ~ibit;
    547 		}
    548 	}
    549 	while (pci_hwpend) {
    550 		irq = ffs(pci_hwpend) - 1;
    551 		ibit = (1U << irq);
    552 
    553 		iq = &intrq[irq + SYS_NIRQ];
    554 		iq->iq_ev.ev_count++;
    555 		uvmexp.intrs++;
    556 		for (ih = TAILQ_FIRST(&iq->iq_list); ih != NULL;
    557 		     ih = TAILQ_NEXT(ih, ih_list)) {
    558 			int	ipl;
    559 
    560 			curcpu()->ci_cpl = ipl = ih->ih_ipl;
    561 			oldirqstate = enable_interrupts(I32_bit);
    562 			(void) (*ih->ih_func)(ih->ih_arg ? ih->ih_arg : frame);
    563 			restore_interrupts(oldirqstate);
    564 			pci_hwpend &= ~ibit;
    565 		}
    566 	}
    567 
    568 	curcpu()->ci_cpl = pcpl;
    569 	hardware_spl_level = pcpl;
    570 	ixp12x0_set_intrmask(imask[pcpl], pci_imask[pcpl]);
    571 
    572 #ifdef __HAVE_FAST_SOFTINTS
    573 	/* Check for pendings soft intrs. */
    574 	if ((ipending & INT_SWMASK) & ~imask[pcpl]) {
    575 		oldirqstate = enable_interrupts(I32_bit);
    576 		ixp12x0_do_pending();
    577 		restore_interrupts(oldirqstate);
    578 	}
    579 #endif
    580 }
    581