/* $NetBSD: ofw_irqhandler.c,v 1.23 2020/11/20 18:26:26 thorpej Exp $ */ /* * 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. * * from: irqhandler.c * * IRQ/FIQ initialisation, claim, release and handler routines * * Created : 30/09/94 */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: ofw_irqhandler.c,v 1.23 2020/11/20 18:26:26 thorpej Exp $"); #include <sys/param.h> #include <sys/systm.h> #include <sys/syslog.h> #include <sys/kmem.h> #include <sys/intr.h> #include <machine/irqhandler.h> #include <machine/cpu.h> irqhandler_t *irqhandlers[NIRQS]; u_int current_mask; u_int actual_mask; u_int disabled_mask; u_int irqmasks[NIPL]; /* Prototypes */ int podule_irqhandler(void); extern void set_spl_masks(void); /* * 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) { int level; #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); 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; /* * Update the irq masks. * Find the lowest interrupt priority on the irq chain. * Interrupt is allowable at priorities lower than this. * If ih_level is out of range then don't bother to update * the masks. */ if (handler->ih_level >= 0 && handler->ih_level < NIPL) { irqhandler_t *ptr; /* * Find the lowest interrupt priority on the irq chain. * Interrupt is allowable at priorities lower than this. */ ptr = irqhandlers[irq]; if (ptr) { level = ptr->ih_level - 1; while (ptr) { if (ptr->ih_level - 1 < level) level = ptr->ih_level - 1; ptr = ptr->ih_next; } while (level >= 0) { irqmasks[level] |= (1 << irq); --level; } } #include "sl.h" #include "ppp.h" #if NSL > 0 || NPPP > 0 /* In the presence of SLIP or PPP, splimp > spltty. */ irqmasks[IPL_NET] &= irqmasks[IPL_TTY]; #endif } 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) { int level; 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 */ irqhand = irqhandlers[irq]; prehand = &irqhandlers[irq]; while (irqhand && handler != irqhand) { prehand = &irqhand; irqhand = irqhand->ih_next; } /* Remove the handler if located */ if (irqhand) *prehand = irqhand->ih_next; else return(-1); /* Now the handler has been removed from the chain mark is 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; /* * Update the irq masks. * If ih_level is out of range then don't bother to update * the masks. */ if (handler->ih_level >= 0 && handler->ih_level < NIPL) { irqhandler_t *ptr; /* Clean the bit from all the masks */ for (level = 0; level < NIPL; ++level) irqmasks[level] &= ~(1 << irq); /* * Find the lowest interrupt priority on the irq chain. * Interrupt is allowable at priorities lower than this. */ ptr = irqhandlers[irq]; if (ptr) { level = ptr->ih_level - 1; while (ptr) { if (ptr->ih_level - 1 < level) level = ptr->ih_level - 1; ptr = ptr->ih_next; } while (level >= 0) { irqmasks[level] |= (1 << irq); --level; } } } /* * 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); } 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) { register 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) { register 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); /* called from assembly */ 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" : ""); }
