/* $NetBSD: iomd_irqhandler.c,v 1.29 2001/07/10 20:10:49 bjh21 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. * * IRQ/FIQ initialisation, claim, release and handler routines * * from: irqhandler.c,v 1.14 1997/04/02 21:52:19 christos Exp $ */ #include "opt_irqstats.h" #include #include #include #include #include #include #include #include #include #include irqhandler_t *irqhandlers[NIRQS]; fiqhandler_t *fiqhandlers; int current_intr_depth; u_int current_mask; u_int actual_mask; u_int disabled_mask; u_int spl_mask; u_int irqmasks[IPL_LEVELS]; u_int irqblock[NIRQS]; extern u_int soft_interrupts; /* Only so we can initialise it */ extern char *_intrnames; /* Prototypes */ extern void zero_page_readonly __P((void)); extern void zero_page_readwrite __P((void)); extern int fiq_setregs __P((fiqhandler_t *)); extern int fiq_getregs __P((fiqhandler_t *)); extern void set_spl_masks __P((void)); /* * void irq_init(void) * * Initialise the IRQ/FIQ sub system */ void irq_init() { int loop; /* Clear all the IRQ handlers and the irq block masks */ for (loop = 0; loop < NIRQS; ++loop) { irqhandlers[loop] = NULL; irqblock[loop] = 0; } /* Clear the FIQ handler */ fiqhandlers = NULL; /* Clear the IRQ/FIQ masks in the IOMD */ IOMD_WRITE_BYTE(IOMD_IRQMSKA, 0x00); IOMD_WRITE_BYTE(IOMD_IRQMSKB, 0x00); switch (IOMD_ID) { case RPC600_IOMD_ID: break; case ARM7500_IOC_ID: case ARM7500FE_IOC_ID: IOMD_WRITE_BYTE(IOMD_IRQMSKC, 0x00); IOMD_WRITE_BYTE(IOMD_IRQMSKD, 0x00); break; default: printf("Unknown IOMD id (%d) found in irq_init()\n", IOMD_ID); }; IOMD_WRITE_BYTE(IOMD_FIQMSK, 0x00); IOMD_WRITE_BYTE(IOMD_DMAMSK, 0x00); /* * 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 < IPL_LEVELS; ++loop) irqmasks[loop] = 0; current_intr_depth = 0; current_mask = 0x00000000; disabled_mask = 0x00000000; actual_mask = 0x00000000; spl_mask = 0x00000000; soft_interrupts = 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(irq, handler) int irq; irqhandler_t *handler; { int level; int loop; #ifdef DIAGNOSTIC /* Sanity check */ if (handler == NULL) panic("NULL interrupt handler\n"); if (handler->ih_func == NULL) panic("Interrupt handler does not have a function\n"); #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 >= IPL_LEVELS) return(-1); /* 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; #ifdef IRQSTATS /* Get the interrupt name from the head of the list */ if (handler->ih_name) { char *ptr = _intrnames + (irq * 14); strcpy(ptr, " "); strncpy(ptr, handler->ih_name, min(strlen(handler->ih_name), 13)); } else { char *ptr = _intrnames + (irq * 14); sprintf(ptr, "irq %2d ", irq); } #endif /* IRQSTATS */ /* * 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 < IPL_LEVELS) { 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) { int max_level; level = ptr->ih_level - 1; max_level = ptr->ih_level - 1; while (ptr) { if (ptr->ih_level - 1 < level) level = ptr->ih_level - 1; else if (ptr->ih_level - 1 > max_level) max_level = ptr->ih_level - 1; ptr = ptr->ih_next; } /* Clear out any levels that we cannot now allow */ while (max_level >=0 && max_level > level) { irqmasks[max_level] &= ~(1 << irq); --max_level; } 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 } /* * We now need to update the irqblock array. This array indicates * what other interrupts should be blocked when interrupt is asserted * This basically emulates hardware interrupt priorities e.g. by * blocking all other IPL_BIO interrupts with an IPL_BIO interrupt * is asserted. For each interrupt we find the highest IPL and set * the block mask to the interrupt mask for that level. */ for (loop = 0; loop < NIRQS; ++loop) { irqhandler_t *ptr; ptr = irqhandlers[loop]; if (ptr) { /* There is at least 1 handler so scan the chain */ level = ptr->ih_level; while (ptr) { if (ptr->ih_level > level) level = ptr->ih_level; ptr = ptr->ih_next; } irqblock[loop] = ~irqmasks[level]; } else /* No handlers for this irq so nothing to block */ irqblock[loop] = 0; } 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(irq, handler) int irq; irqhandler_t *handler; { int level; int loop; irqhandler_t *irqhand; irqhandler_t **prehand; #ifdef IRQSTATS extern char *_intrnames; #endif /* * 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->ih_next; 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; #ifdef IRQSTATS /* Get the interrupt name from the head of the list */ if (irqhandlers[irq] && irqhandlers[irq]->ih_name) { char *ptr = _intrnames + (irq * 14); strcpy(ptr, " "); strncpy(ptr, irqhandlers[irq]->ih_name, min(strlen(irqhandlers[irq]->ih_name), 13)); } else { char *ptr = _intrnames + (irq * 14); sprintf(ptr, "irq %2d ", irq); } #endif /* IRQSTATS */ /* * 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 < IPL_LEVELS) { irqhandler_t *ptr; /* Clean the bit from all the masks */ for (level = 0; level < IPL_LEVELS; ++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; } } } /* * We now need to update the irqblock array. This array indicates * what other interrupts should be blocked when interrupt is asserted * This basically emulates hardware interrupt priorities e.g. by * blocking all other IPL_BIO interrupts with an IPL_BIO interrupt * is asserted. For each interrupt we find the highest IPL and set * the block mask to the interrupt mask for that level. */ for (loop = 0; loop < NIRQS; ++loop) { irqhandler_t *ptr; ptr = irqhandlers[loop]; if (ptr) { /* There is at least 1 handler so scan the chain */ level = ptr->ih_level; while (ptr) { if (ptr->ih_level > level) level = ptr->ih_level; ptr = ptr->ih_next; } irqblock[loop] = ~irqmasks[level]; } else /* No handlers for this irq so nothing to block */ irqblock[loop] = 0; } /* * 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(irq, level, name, ih_func, ih_arg) int irq; int level; const char *name; int (*ih_func) __P((void *)); void *ih_arg; { irqhandler_t *ih; ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT); if (!ih) panic("intr_claim(): Cannot malloc handler memory\n"); ih->ih_level = level; ih->ih_name = name; ih->ih_func = ih_func; ih->ih_arg = ih_arg; ih->ih_flags = 0; if (irq_claim(irq, ih) != 0) return(NULL); return(ih); } int intr_release(arg) void *arg; { irqhandler_t *ih = (irqhandler_t *)arg; if (irq_release(ih->ih_num, ih) == 0) { free(ih, M_DEVBUF); return(0); } return(1); } #if 0 u_int disable_interrupts(mask) u_int mask; { u_int cpsr; cpsr = SetCPSR(mask, mask); return(cpsr); } u_int restore_interrupts(old_cpsr) u_int old_cpsr; { int mask = I32_bit | F32_bit; return(SetCPSR(mask, old_cpsr & mask)); } u_int enable_interrupts(mask) u_int mask; { return(SetCPSR(mask, 0)); } #endif /* * void disable_irq(int irq) * * Disables a specific irq. The irq is removed from the master irq mask */ void disable_irq(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(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(mask) 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" : ""); } /* * int fiq_claim(fiqhandler_t *handler) * * Claim FIQ's and install a handler for them. */ int fiq_claim(handler) fiqhandler_t *handler; { /* Fail if the FIQ's are already claimed */ if (fiqhandlers) return(-1); if (handler->fh_size > 0xc0) return(-1); /* Install the handler */ fiqhandlers = handler; /* Now we have to actually install the FIQ handler */ /* Eventually we will copy this down but for the moment ... */ zero_page_readwrite(); WriteWord(0x0000003c, (u_int) handler->fh_func); zero_page_readonly(); /* We must now set up the FIQ registers */ fiq_setregs(handler); /* Set up the FIQ mask */ IOMD_WRITE_BYTE(IOMD_FIQMSK, handler->fh_mask); /* Make sure that the FIQ's are enabled */ enable_interrupts(F32_bit); return(0); } /* * int fiq_release(fiqhandler_t *handler) * * Release FIQ's and remove a handler for them. */ int fiq_release(handler) fiqhandler_t *handler; { /* Fail if the handler is wrong */ if (fiqhandlers != handler) return(-1); /* Disable FIQ interrupts */ disable_interrupts(F32_bit); /* Clear up the FIQ mask */ IOMD_WRITE_BYTE(IOMD_FIQMSK, 0x00); /* Retrieve the FIQ registers */ fiq_getregs(handler); /* Remove the handler */ fiqhandlers = NULL; return(0); } /* End of irqhandler.c */