patch-2.4.22 linux-2.4.22/arch/mips/galileo-boards/ev64120/irq.c
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- Lines: 457
- Date:
1969-12-31 16:00:00.000000000 -0800
- Orig file:
linux-2.4.21/arch/mips/galileo-boards/ev64120/irq.c
- Orig date:
2002-11-28 15:53:10.000000000 -0800
diff -urN linux-2.4.21/arch/mips/galileo-boards/ev64120/irq.c linux-2.4.22/arch/mips/galileo-boards/ev64120/irq.c
@@ -1,456 +0,0 @@
-/*
- * BRIEF MODULE DESCRIPTION
- * Code to handle irqs on GT64120A boards
- * Derived from mips/orion and Cort <cort@fsmlabs.com>
- *
- * Copyright (C) 2000 RidgeRun, Inc.
- * Author: RidgeRun, Inc.
- * glonnon@ridgerun.com, skranz@ridgerun.com, stevej@ridgerun.com
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- * THIS SOFTWARE IS PROVIDED ``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.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-#include <linux/config.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/kernel_stat.h>
-#include <linux/module.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/types.h>
-#include <linux/interrupt.h>
-#include <linux/ioport.h>
-#include <linux/timex.h>
-#include <linux/slab.h>
-#include <linux/random.h>
-#include <asm/bitops.h>
-#include <asm/bootinfo.h>
-#include <asm/io.h>
-#include <asm/mipsregs.h>
-#include <asm/system.h>
-#include <asm/galileo-boards/ev64120int.h>
-
-#undef IRQ_DEBUG
-
-#ifdef IRQ_DEBUG
-#define DBG(x...) printk(x)
-#else
-#define DBG(x...)
-#endif
-
-
-asmlinkage void do_IRQ(int irq, struct pt_regs *regs);
-
-#define MAX_AGENTS_PER_INT 21 /* Random number */
-unsigned char pci_int_irq[MAX_AGENTS_PER_INT];
-static int max_interrupts = 0;
-
-/* Duplicate interrupt handlers. */
-/********************************************************************
- *pci_int(A/B/C/D) -
- *
- *Calls all the handlers connected to PCI interrupt A/B/C/D
- *
- *Inputs :
- *
- *Outpus :
- *
- *********************************************************************/
-asmlinkage __inline__ void pci_intA(struct pt_regs *regs)
-{
- unsigned int count = 0;
- DBG(KERN_INFO "pci_intA, max_interrupts %d\n", max_interrupts);
- for (count = 0; count < max_interrupts; count++) {
- do_IRQ(pci_int_irq[count], regs);
- }
-}
-
-asmlinkage __inline__ void pci_intD(struct pt_regs *regs)
-{
- unsigned int count = 0;
- DBG(KERN_INFO "pci_intD, max_interrupts %d\n", max_interrupts);
- for (count = 0; count < max_interrupts; count++) {
- do_IRQ(pci_int_irq[count], regs);
- }
-}
-
-
-/* Function for careful CP0 interrupt mask access */
-static inline void modify_cp0_intmask(unsigned clr_mask, unsigned set_mask)
-{
- unsigned long status = read_32bit_cp0_register(CP0_STATUS);
- DBG(KERN_INFO "modify_cp0_intmask clr %x, set %x\n", clr_mask,
- set_mask);
- DBG(KERN_INFO "modify_cp0_intmask status %x\n", status);
- status &= ~((clr_mask & 0xFF) << 8);
- status |= (set_mask & 0xFF) << 8;
- DBG(KERN_INFO "modify_cp0_intmask status %x\n", status);
- write_32bit_cp0_register(CP0_STATUS, status);
-}
-
-static inline void mask_irq(unsigned int irq_nr)
-{
- modify_cp0_intmask(irq_nr, 0);
-}
-
-static inline void unmask_irq(unsigned int irq_nr)
-{
- modify_cp0_intmask(0, irq_nr);
-}
-
-void disable_irq(unsigned int irq_nr)
-{
- unsigned long flags;
-
- DBG(KERN_INFO "disable_irq, irq %d\n", irq_nr);
- save_and_cli(flags);
- if (irq_nr >= 8) { // All PCI interrupts are on line 5 or 2
- mask_irq(9 << 2);
- } else {
- mask_irq(1 << irq_nr);
- }
- restore_flags(flags);
-}
-
-void enable_irq(unsigned int irq_nr)
-{
- unsigned long flags;
-
- DBG(KERN_INFO "enable_irq, irq %d\n", irq_nr);
- save_and_cli(flags);
- if (irq_nr >= 8) { // All PCI interrupts are on line 5 or 2
- DBG(KERN_INFO __FUNCTION__ " pci interrupt %d\n", irq_nr);
- unmask_irq(9 << 2);
- } else {
- DBG(KERN_INFO __FUNCTION__ " interrupt set mask %d\n",
- 1 << irq_nr);
- unmask_irq(1 << irq_nr);
- }
- restore_flags(flags);
-}
-
-/*
- * Generic no controller code
- */
-
-static void no_irq_enable_disable(unsigned int irq)
-{
-}
-static unsigned int no_irq_startup(unsigned int irq)
-{
- return 0;
-}
-
-#if 0
-static void no_irq_ack(unsigned int irq)
-{
- printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq);
-}
-#endif
-
-struct hw_interrupt_type no_irq_type = {
- typename:"none",
- startup:no_irq_startup,
- shutdown:no_irq_enable_disable,
- enable:no_irq_enable_disable,
- disable:no_irq_enable_disable,
- ack:NULL,
- end:no_irq_enable_disable,
-};
-
-// ack: no_irq_ack, re-enable later -- SKJ
-
-
-/*
- * Controller mappings for all interrupt sources:
- */
-irq_desc_t irq_desc[NR_IRQS];
-
-atomic_t irq_err_count;
-
-int get_irq_list(char *buf)
-{
- int i, len = 0, j;
- struct irqaction *action;
-
- len += sprintf(buf + len, " ");
- for (j = 0; j < smp_num_cpus; j++)
- len += sprintf(buf + len, "CPU%d ", j);
- *(char *) (buf + len++) = '\n';
-
- for (i = 0; i < NR_IRQS; i++) {
- action = irq_desc[i].action;
- if (!action || !action->handler)
- continue;
- len += sprintf(buf + len, "%3d: ", i);
- len += sprintf(buf + len, "%10u ", kstat_irqs(i));
- if (irq_desc[i].handler)
- len +=
- sprintf(buf + len, " %s ",
- irq_desc[i].handler->typename);
- else
- len += sprintf(buf + len, " None ");
- len += sprintf(buf + len, " %s", action->name);
- for (action = action->next; action; action = action->next) {
- len += sprintf(buf + len, ", %s", action->name);
- }
- len += sprintf(buf + len, "\n");
- }
- len += sprintf(buf + len, "BAD: %10lu\n", atomic_read(&irq_err_count));
- return len;
-}
-
-asmlinkage void do_IRQ(int irq, struct pt_regs *regs)
-{
- struct irqaction *action;
- int cpu;
-
-#ifdef IRQ_DEBUG
- if (irq != TIMER)
- DBG(KERN_INFO __FUNCTION__ " irq = %d\n", irq);
- if (irq != TIMER)
- DBG(KERN_INFO "cause register = %x\n",
- read_32bit_cp0_register(CP0_CAUSE));
- if (irq != TIMER)
- DBG(KERN_INFO "status register = %x\n",
- read_32bit_cp0_register(CP0_STATUS));
-#endif
-
- cpu = smp_processor_id();
- irq_enter(cpu, irq);
- kstat.irqs[cpu][irq]++;
-
- if (irq_desc[irq].handler->ack) {
- irq_desc[irq].handler->ack(irq);
- }
-
- disable_irq(irq);
-
- action = irq_desc[irq].action;
- if (action && action->handler) {
-#ifdef IRQ_DEBUG
- if (irq != TIMER)
- DBG(KERN_INFO
- "rr: irq %d action %p and handler %p\n", irq,
- action, action->handler);
-#endif
- if (!(action->flags & SA_INTERRUPT))
- __sti();
- do {
- action->handler(irq, action->dev_id, regs);
- action = action->next;
- } while (action);
- __cli();
- if (irq_desc[irq].handler) {
- if (irq_desc[irq].handler->end)
- irq_desc[irq].handler->end(irq);
- else if (irq_desc[irq].handler->enable)
- irq_desc[irq].handler->enable(irq);
- }
- }
-
- enable_irq(irq);
- irq_exit(cpu, irq);
-
- if (softirq_pending(cpu))
- do_softirq();
-
- /* unmasking and bottom half handling is done magically for us. */
-}
-
-int request_irq(unsigned int irq,
- void (*handler) (int, void *, struct pt_regs *),
- unsigned long irqflags, const char *devname, void *dev_id)
-{
- struct irqaction *old, **p, *action;
- unsigned long flags;
-
- DBG(KERN_INFO "rr:dev %s irq %d handler %x\n", devname, irq,
- handler);
- if (irq >= NR_IRQS)
- return -EINVAL;
-
- action = (struct irqaction *)
- kmalloc(sizeof(struct irqaction), GFP_KERNEL);
- if (!action)
- return -ENOMEM;
-
- action->handler = handler;
- action->flags = irqflags;
- action->mask = 0;
- action->name = devname;
- action->dev_id = dev_id;
- action->next = NULL;
-
- save_flags(flags);
- cli();
-
- p = &irq_desc[irq].action;
-
- if ((old = *p) != NULL) {
- /* Can't share interrupts unless both agree to */
- if (!(old->flags & action->flags & SA_SHIRQ))
- return -EBUSY;
- /* add new interrupt at end of irq queue */
- do {
- p = &old->next;
- old = *p;
- } while (old);
- }
- *p = action;
-
- restore_flags(flags);
- if (irq >= 8) {
- DBG(KERN_INFO "request_irq, max_interrupts %d\n",
- max_interrupts);
- pci_int_irq[max_interrupts++] = irq; // NOTE: Add error-handling if > max
- }
- enable_irq(irq);
- return 0;
-}
-
-
-void free_irq(unsigned int irq, void *dev_id)
-{
- struct irqaction *p, *old = NULL;
- unsigned long flags;
- int count, tmp, removed = 0;
-
- for (p = irq_desc[irq].action; p != NULL; old = p, p = p->next) {
- /* Found the IRQ, is it the correct dev_id? */
- if (dev_id == p->dev_id) {
- save_flags(flags);
- cli();
-
- // remove link from list
- if (old)
- old->next = p->next;
- else
- irq_desc[irq].action = p->next;
-
- restore_flags(flags);
- kfree(p);
- removed = 1;
- break;
- }
- }
-
- /*
- Remove PCI interrupts from the pci_int_irq list. Make sure
- that some handler was removed before decrementing max_interrupts.
- */
- if ((irq >= 8) && (removed)) {
- for (count = 0; count < max_interrupts; count++) {
- if (pci_int_irq[count] == irq) {
- for (tmp = count; tmp < max_interrupts;
- tmp++) {
- pci_int_irq[tmp] =
- pci_int_irq[tmp + 1];
- }
- }
- }
- max_interrupts--;
- DBG(KERN_INFO "free_irq, max_interrupts %d\n",
- max_interrupts);
- }
-}
-
-unsigned long probe_irq_on(void)
-{
- printk(KERN_INFO "probe_irq_on\n");
- return 0;
-}
-
-int probe_irq_off(unsigned long irqs)
-{
- printk(KERN_INFO "probe_irq_off\n");
- return 0;
-}
-
-/********************************************************************
- *galileo_irq_setup -
- *
- *Initializes CPU interrupts
- *
- *
- *Inputs :
- *
- *Outpus :
- *
- *********************************************************************/
-void galileo_irq_setup(void)
-{
- extern asmlinkage void galileo_handle_int(void);
- extern void galileo_irq_init(void);
-
- DBG(KERN_INFO "rr: galileo_irq_setup entry\n");
-
- galileo_irq_init();
-
- /*
- * Clear all of the interrupts while we change the able around a bit.
- */
- clear_cp0_status(ST0_IM);
-
- /* Sets the exception_handler array. */
- set_except_vector(0, galileo_handle_int);
-
- cli();
-
- /*
- * Enable timer. Other interrupts will be enabled as they are
- * registered.
- */
- set_cp0_status(IE_IRQ2);
-
-
-#ifdef CONFIG_REMOTE_DEBUG
- {
- extern int DEBUG_CHANNEL;
- serial_init(DEBUG_CHANNEL);
- serial_set(DEBUG_CHANNEL, 115200);
- set_debug_traps();
- breakpoint(); /* you may move this line to whereever you want :-) */
- }
-#endif
-}
-
-void init_irq_proc(void)
-{
- /* Nothing, for now. */
-}
-
-void __init init_IRQ(void)
-{
- int i;
-
- DBG(KERN_INFO "rr:init_IRQ\n");
-
- /* Let's initialize our IRQ descriptors */
- for (i = 0; i < NR_IRQS; i++) {
- irq_desc[i].status = 0;
- irq_desc[i].handler = &no_irq_type;
- irq_desc[i].action = NULL;
- irq_desc[i].depth = 0;
- irq_desc[i].lock = SPIN_LOCK_UNLOCKED;
- }
-
- galileo_irq_setup();
-}
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TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)