/* $NetBSD: isa_irqhandler.c,v 1.29 2020/11/22 03:57:19 thorpej Exp $ */ /* * Copyright 1997 * Digital Equipment Corporation. All rights reserved. * * This software is furnished under license and may be used and * copied only in accordance with the following terms and conditions. * Subject to these conditions, you may download, copy, install, * use, modify and distribute this software in source and/or binary * form. No title or ownership is transferred hereby. * * 1) Any source code used, modified or distributed must reproduce * and retain this copyright notice and list of conditions as * they appear in the source file. * * 2) No right is granted to use any trade name, trademark, or logo of * Digital Equipment Corporation. Neither the "Digital Equipment * Corporation" name nor any trademark or logo of Digital Equipment * Corporation may be used to endorse or promote products derived * from this software without the prior written permission of * Digital Equipment Corporation. * * 3) This software is provided "AS-IS" and any express or implied * warranties, including but not limited to, any implied warranties * of merchantability, fitness for a particular purpose, or * non-infringement are disclaimed. In no event shall DIGITAL be * liable for any damages whatsoever, and in particular, DIGITAL * shall not be liable for special, indirect, consequential, or * incidental damages or damages for lost profits, loss of * revenue or loss of use, whether such damages arise in contract, * negligence, tort, under statute, in equity, at law or otherwise, * even if advised of the possibility of such damage. */ /* * Copyright (c) 1994-1998 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 Mark Brinicombe * for the NetBSD Project. * 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 THE AUTHOR ``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 THE AUTHOR 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/FIQ initialisation, claim, release and handler routines * * from: irqhandler.c * * Created : 30/09/94 */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: isa_irqhandler.c,v 1.29 2020/11/22 03:57:19 thorpej Exp $"); #include <sys/param.h> #include <sys/systm.h> #include <sys/syslog.h> #include <sys/kmem.h> #include <sys/intr.h> #include <arm/locore.h> #include <machine/irqhandler.h> irqhandler_t *irqhandlers[NIRQS]; u_int current_mask; u_int actual_mask; u_int disabled_mask; u_int irqmasks[NIPL]; /* Prototypes */ extern void set_spl_masks(void); void irq_calculatemasks(void); void stray_irqhandler(u_int); #define WriteWord(a, b) *((volatile unsigned int *)(a)) = (b) /* * void irq_init(void) * * Initialise the IRQ/FIQ sub system */ void irq_init(void) { int loop; /* Clear all the IRQ handlers and the irq block masks */ for (loop = 0; loop < NIRQS; ++loop) { irqhandlers[loop] = NULL; } /* * Setup the irqmasks for the different Interrupt Priority Levels * We will start with no bits set and these will be updated as handlers * are installed at different IPL's. */ for (loop = 0; loop < NIPL; ++loop) irqmasks[loop] = 0; current_mask = 0x00000000; disabled_mask = 0x00000000; actual_mask = 0x00000000; set_spl_masks(); /* Enable IRQ's and FIQ's */ enable_interrupts(I32_bit | F32_bit); } /* * int irq_claim(int irq, irqhandler_t *handler) * * Enable an IRQ and install a handler for it. */ int irq_claim(int irq, irqhandler_t *handler, const char *group, const char *name) { #ifdef DIAGNOSTIC /* Sanity check */ if (handler == NULL) panic("NULL interrupt handler"); if (handler->ih_func == NULL) panic("Interrupt handler does not have a function"); #endif /* DIAGNOSTIC */ /* * IRQ_INSTRUCT indicates that we should get the irq number * from the irq structure */ if (irq == IRQ_INSTRUCT) irq = handler->ih_num; /* Make sure the irq number is valid */ if (irq < 0 || irq >= NIRQS) return(-1); /* Make sure the level is valid */ if (handler->ih_level < 0 || handler->ih_level >= NIPL) return(-1); /* Attach evcnt */ evcnt_attach_dynamic(&handler->ih_ev, EVCNT_TYPE_INTR, NULL, group, name); /* Attach handler at top of chain */ handler->ih_next = irqhandlers[irq]; irqhandlers[irq] = handler; /* * Reset the flags for this handler. * As the handler is now in the chain mark it as active. */ handler->ih_flags = 0 | IRQ_FLAG_ACTIVE; /* * Record the interrupt number for accounting. * Done here as the accounting number may not be the same as the * IRQ number though for the moment they are */ handler->ih_num = irq; irq_calculatemasks(); enable_irq(irq); set_spl_masks(); return(0); } /* * int irq_release(int irq, irqhandler_t *handler) * * Disable an IRQ and remove a handler for it. */ int irq_release(int irq, irqhandler_t *handler) { irqhandler_t *irqhand; irqhandler_t **prehand; /* * IRQ_INSTRUCT indicates that we should get the irq number * from the irq structure */ if (irq == IRQ_INSTRUCT) irq = handler->ih_num; /* Make sure the irq number is valid */ if (irq < 0 || irq >= NIRQS) return(-1); /* Locate the handler */ prehand = &irqhandlers[irq]; irqhand = *prehand; while (irqhand && handler != irqhand) { prehand = &irqhand->ih_next; irqhand = *prehand; } /* Remove the handler if located */ if (irqhand) *prehand = irqhand->ih_next; else return(-1); /* The handler has been removed from the chain so mark it as inactive */ irqhand->ih_flags &= ~IRQ_FLAG_ACTIVE; /* Make sure the head of the handler list is active */ if (irqhandlers[irq]) irqhandlers[irq]->ih_flags |= IRQ_FLAG_ACTIVE; evcnt_detach(&irqhand->ih_ev); irq_calculatemasks(); /* * Disable the appropriate mask bit if there are no handlers left for * this IRQ. */ if (irqhandlers[irq] == NULL) disable_irq(irq); set_spl_masks(); return(0); } /* adapted from .../i386/isa/isa_machdep.c */ /* * Recalculate the interrupt masks from scratch. * We could code special registry and deregistry versions of this function that * would be faster, but the code would be nastier, and we don't expect this to * happen very much anyway. */ void irq_calculatemasks(void) { int irq, level; irqhandler_t *ptr; int irqlevel[NIRQS]; /* First, figure out which levels each IRQ uses. */ for (irq = 0; irq < NIRQS; irq++) { int levels = 0; for (ptr = irqhandlers[irq]; ptr; ptr = ptr->ih_next) levels |= 1 << ptr->ih_level; irqlevel[irq] = levels; } /* Then figure out which IRQs use each level. */ for (level = 0; level < NIPL; level++) { int irqs = 0; for (irq = 0; irq < NIRQS; irq++) if (irqlevel[irq] & (1 << level)) irqs |= 1 << irq; irqmasks[level] = ~irqs; } /* * Enforce a hierarchy that gives slow devices a better chance at not * dropping data. */ KASSERT(irqmasks[IPL_NONE] == ~0); irqmasks[IPL_SOFTCLOCK] &= irqmasks[IPL_NONE]; irqmasks[IPL_SOFTBIO] &= irqmasks[IPL_SOFTCLOCK]; irqmasks[IPL_SOFTNET] &= irqmasks[IPL_SOFTBIO]; irqmasks[IPL_SOFTSERIAL] &= irqmasks[IPL_SOFTNET]; irqmasks[IPL_VM] &= irqmasks[IPL_SOFTSERIAL]; irqmasks[IPL_CLOCK] &= irqmasks[IPL_VM]; irqmasks[IPL_HIGH] &= irqmasks[IPL_CLOCK]; } void * intr_claim(int irq, int level, int (*ih_func)(void *), void *ih_arg, const char *group, const char *name) { irqhandler_t *ih; ih = kmem_zalloc(sizeof(*ih), KM_SLEEP); ih->ih_level = level; ih->ih_func = ih_func; ih->ih_arg = ih_arg; ih->ih_flags = 0; if (irq_claim(irq, ih, group, name) != 0) { kmem_free(ih, sizeof(*ih)); return(NULL); } return(ih); } int intr_release(void *arg) { irqhandler_t *ih = (irqhandler_t *)arg; if (irq_release(ih->ih_num, ih) == 0) { kmem_free(ih, sizeof(*ih)); return(0); } return(1); } /* * void disable_irq(int irq) * * Disables a specific irq. The irq is removed from the master irq mask */ void disable_irq(int irq) { u_int oldirqstate; oldirqstate = disable_interrupts(I32_bit); current_mask &= ~(1 << irq); irq_setmasks(); restore_interrupts(oldirqstate); } /* * void enable_irq(int irq) * * Enables a specific irq. The irq is added to the master irq mask * This routine should be used with caution. A handler should already * be installed. */ void enable_irq(int irq) { u_int oldirqstate; oldirqstate = disable_interrupts(I32_bit); current_mask |= (1 << irq); irq_setmasks(); restore_interrupts(oldirqstate); } /* * void stray_irqhandler(u_int mask) * * Handler for stray interrupts. This gets called if a handler cannot be * found for an interrupt. */ void stray_irqhandler(u_int mask) { static u_int stray_irqs = 0; if (++stray_irqs <= 8) log(LOG_ERR, "Stray interrupt %08x%s\n", mask, stray_irqs >= 8 ? ": stopped logging" : ""); }
