/* irq.c: FRV IRQ handling
*
- * Copyright (C) 2003, 2004 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* 2 of the License, or (at your option) any later version.
*/
-/*
- * (mostly architecture independent, will move to kernel/irq.c in 2.5.)
- *
- * IRQs are in fact implemented a bit like signal handlers for the kernel.
- * Naturally it's not a 1:1 relation, but there are similarities.
- */
-
-#include <linux/config.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/irc-regs.h>
-#include <asm/irq-routing.h>
#include <asm/gdb-stub.h>
-extern void __init fpga_init(void);
-extern void __init route_mb93493_irqs(void);
-
-static void register_irq_proc (unsigned int irq);
+#define set_IRR(N,A,B,C,D) __set_IRR(N, (A << 28) | (B << 24) | (C << 20) | (D << 16))
-/*
- * Special irq handlers.
- */
+extern void __init fpga_init(void);
+#ifdef CONFIG_FUJITSU_MB93493
+extern void __init mb93493_init(void);
+#endif
-irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs) { return IRQ_HANDLED; }
+#define __reg16(ADDR) (*(volatile unsigned short *)(ADDR))
atomic_t irq_err_count;
*/
int show_interrupts(struct seq_file *p, void *v)
{
- struct irqaction *action;
- struct irq_group *group;
+ int i = *(loff_t *) v, cpu;
+ struct irqaction * action;
unsigned long flags;
- int level, grp, ix, i, j;
-
- i = *(loff_t *) v;
-
- switch (i) {
- case 0:
- seq_printf(p, " ");
- for_each_online_cpu(j)
- seq_printf(p, "CPU%d ",j);
-
- seq_putc(p, '\n');
- break;
- case 1 ... NR_IRQ_GROUPS * NR_IRQ_ACTIONS_PER_GROUP:
- local_irq_save(flags);
-
- grp = (i - 1) / NR_IRQ_ACTIONS_PER_GROUP;
- group = irq_groups[grp];
- if (!group)
- goto skip;
-
- ix = (i - 1) % NR_IRQ_ACTIONS_PER_GROUP;
- action = group->actions[ix];
- if (!action)
- goto skip;
-
- seq_printf(p, "%3d: ", i - 1);
-
-#ifndef CONFIG_SMP
- seq_printf(p, "%10u ", kstat_irqs(i));
-#else
- for_each_online_cpu(j)
- seq_printf(p, "%10u ", kstat_cpu(j).irqs[i - 1]);
-#endif
-
- level = group->sources[ix]->level - frv_irq_levels;
-
- seq_printf(p, " %12s@%x", group->sources[ix]->muxname, level);
- seq_printf(p, " %s", action->name);
-
- for (action = action->next; action; action = action->next)
- seq_printf(p, ", %s", action->name);
+ if (i == 0) {
+ char cpuname[12];
+ seq_printf(p, " ");
+ for_each_present_cpu(cpu) {
+ sprintf(cpuname, "CPU%d", cpu);
+ seq_printf(p, " %10s", cpuname);
+ }
seq_putc(p, '\n');
-skip:
- local_irq_restore(flags);
- break;
+ }
- case NR_IRQ_GROUPS * NR_IRQ_ACTIONS_PER_GROUP + 1:
- seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
- break;
+ if (i < NR_IRQS) {
+ spin_lock_irqsave(&irq_desc[i].lock, flags);
+ action = irq_desc[i].action;
+ if (action) {
+ seq_printf(p, "%3d: ", i);
+ for_each_present_cpu(cpu)
+ seq_printf(p, "%10u ", kstat_cpu(cpu).irqs[i]);
+ seq_printf(p, " %10s", irq_desc[i].chip->name ? : "-");
+ seq_printf(p, " %s", action->name);
+ for (action = action->next;
+ action;
+ action = action->next)
+ seq_printf(p, ", %s", action->name);
+
+ seq_putc(p, '\n');
+ }
- default:
- break;
+ spin_unlock_irqrestore(&irq_desc[i].lock, flags);
+ } else if (i == NR_IRQS) {
+ seq_printf(p, "Err: %10u\n", atomic_read(&irq_err_count));
}
return 0;
}
-
/*
- * Generic enable/disable code: this just calls
- * down into the PIC-specific version for the actual
- * hardware disable after having gotten the irq
- * controller lock.
+ * on-CPU PIC operations
*/
-
-/**
- * disable_irq_nosync - disable an irq without waiting
- * @irq: Interrupt to disable
- *
- * Disable the selected interrupt line. Disables and Enables are
- * nested.
- * Unlike disable_irq(), this function does not ensure existing
- * instances of the IRQ handler have completed before returning.
- *
- * This function may be called from IRQ context.
- */
-
-void disable_irq_nosync(unsigned int irq)
+static void frv_cpupic_ack(unsigned int irqlevel)
{
- struct irq_source *source;
- struct irq_group *group;
- struct irq_level *level;
- unsigned long flags;
- int idx = irq & (NR_IRQ_ACTIONS_PER_GROUP - 1);
-
- group = irq_groups[irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP];
- if (!group)
- BUG();
-
- source = group->sources[idx];
- if (!source)
- BUG();
-
- level = source->level;
-
- spin_lock_irqsave(&level->lock, flags);
-
- if (group->control) {
- if (!group->disable_cnt[idx]++)
- group->control(group, idx, 0);
- } else if (!level->disable_count++) {
- __set_MASK(level - frv_irq_levels);
- }
-
- spin_unlock_irqrestore(&level->lock, flags);
+ __clr_RC(irqlevel);
+ __clr_IRL();
}
-EXPORT_SYMBOL(disable_irq_nosync);
-
-/**
- * disable_irq - disable an irq and wait for completion
- * @irq: Interrupt to disable
- *
- * Disable the selected interrupt line. Enables and Disables are
- * nested.
- * This function waits for any pending IRQ handlers for this interrupt
- * to complete before returning. If you use this function while
- * holding a resource the IRQ handler may need you will deadlock.
- *
- * This function may be called - with care - from IRQ context.
- */
-
-void disable_irq(unsigned int irq)
+static void frv_cpupic_mask(unsigned int irqlevel)
{
- disable_irq_nosync(irq);
-
-#ifdef CONFIG_SMP
- if (!local_irq_count(smp_processor_id())) {
- do {
- barrier();
- } while (irq_desc[irq].status & IRQ_INPROGRESS);
- }
-#endif
+ __set_MASK(irqlevel);
}
-EXPORT_SYMBOL(disable_irq);
-
-/**
- * enable_irq - enable handling of an irq
- * @irq: Interrupt to enable
- *
- * Undoes the effect of one call to disable_irq(). If this
- * matches the last disable, processing of interrupts on this
- * IRQ line is re-enabled.
- *
- * This function may be called from IRQ context.
- */
-
-void enable_irq(unsigned int irq)
+static void frv_cpupic_mask_ack(unsigned int irqlevel)
{
- struct irq_source *source;
- struct irq_group *group;
- struct irq_level *level;
- unsigned long flags;
- int idx = irq & (NR_IRQ_ACTIONS_PER_GROUP - 1);
- int count;
-
- group = irq_groups[irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP];
- if (!group)
- BUG();
-
- source = group->sources[idx];
- if (!source)
- BUG();
-
- level = source->level;
-
- spin_lock_irqsave(&level->lock, flags);
-
- if (group->control)
- count = group->disable_cnt[idx];
- else
- count = level->disable_count;
-
- switch (count) {
- case 1:
- if (group->control) {
- if (group->actions[idx])
- group->control(group, idx, 1);
- } else {
- if (level->usage)
- __clr_MASK(level - frv_irq_levels);
- }
- /* fall-through */
-
- default:
- count--;
- break;
-
- case 0:
- printk("enable_irq(%u) unbalanced from %p\n", irq, __builtin_return_address(0));
- }
+ __set_MASK(irqlevel);
+ __clr_RC(irqlevel);
+ __clr_IRL();
+}
- if (group->control)
- group->disable_cnt[idx] = count;
- else
- level->disable_count = count;
+static void frv_cpupic_unmask(unsigned int irqlevel)
+{
+ __clr_MASK(irqlevel);
+}
- spin_unlock_irqrestore(&level->lock, flags);
+static void frv_cpupic_end(unsigned int irqlevel)
+{
+ __clr_MASK(irqlevel);
}
-EXPORT_SYMBOL(enable_irq);
+static struct irq_chip frv_cpu_pic = {
+ .name = "cpu",
+ .ack = frv_cpupic_ack,
+ .mask = frv_cpupic_mask,
+ .mask_ack = frv_cpupic_mask_ack,
+ .unmask = frv_cpupic_unmask,
+ .end = frv_cpupic_end,
+};
-/*****************************************************************************/
/*
* handles all normal device IRQ's
* - registers are referred to by the __frame variable (GR28)
*/
asmlinkage void do_IRQ(void)
{
- struct irq_source *source;
- int level, cpu;
-
irq_enter();
-
- level = (__frame->tbr >> 4) & 0xf;
- cpu = smp_processor_id();
-
- if ((unsigned long) __frame - (unsigned long) (current + 1) < 512)
- BUG();
-
- __set_MASK(level);
- __clr_RC(level);
- __clr_IRL();
-
- kstat_this_cpu.irqs[level]++;
-
- for (source = frv_irq_levels[level].sources; source; source = source->next)
- source->doirq(source);
-
- __clr_MASK(level);
-
+ generic_handle_irq(__get_IRL());
irq_exit();
+}
-} /* end do_IRQ() */
-
-/*****************************************************************************/
/*
* handles all NMIs when not co-opted by the debugger
* - registers are referred to by the __frame variable (GR28)
*/
asmlinkage void do_NMI(void)
{
-} /* end do_NMI() */
-
-/*****************************************************************************/
-/**
- * request_irq - allocate an interrupt line
- * @irq: Interrupt line to allocate
- * @handler: Function to be called when the IRQ occurs
- * @irqflags: Interrupt type flags
- * @devname: An ascii name for the claiming device
- * @dev_id: A cookie passed back to the handler function
- *
- * This call allocates interrupt resources and enables the
- * interrupt line and IRQ handling. From the point this
- * call is made your handler function may be invoked. Since
- * your handler function must clear any interrupt the board
- * raises, you must take care both to initialise your hardware
- * and to set up the interrupt handler in the right order.
- *
- * Dev_id must be globally unique. Normally the address of the
- * device data structure is used as the cookie. Since the handler
- * receives this value it makes sense to use it.
- *
- * If your interrupt is shared you must pass a non NULL dev_id
- * as this is required when freeing the interrupt.
- *
- * Flags:
- *
- * SA_SHIRQ Interrupt is shared
- *
- * SA_INTERRUPT Disable local interrupts while processing
- *
- * SA_SAMPLE_RANDOM The interrupt can be used for entropy
- *
- */
-
-int request_irq(unsigned int irq,
- irqreturn_t (*handler)(int, void *, struct pt_regs *),
- unsigned long irqflags,
- const char * devname,
- void *dev_id)
-{
- int retval;
- struct irqaction *action;
-
-#if 1
- /*
- * Sanity-check: shared interrupts should REALLY pass in
- * a real dev-ID, otherwise we'll have trouble later trying
- * to figure out which interrupt is which (messes up the
- * interrupt freeing logic etc).
- */
- if (irqflags & SA_SHIRQ) {
- if (!dev_id)
- printk("Bad boy: %s (at 0x%x) called us without a dev_id!\n",
- devname, (&irq)[-1]);
- }
-#endif
-
- if ((irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP) >= NR_IRQ_GROUPS)
- return -EINVAL;
- if (!handler)
- return -EINVAL;
-
- action = (struct irqaction *) kmalloc(sizeof(struct irqaction), GFP_KERNEL);
- if (!action)
- return -ENOMEM;
-
- action->handler = handler;
- action->flags = irqflags;
- action->mask = CPU_MASK_NONE;
- action->name = devname;
- action->next = NULL;
- action->dev_id = dev_id;
-
- retval = setup_irq(irq, action);
- if (retval)
- kfree(action);
- return retval;
-}
-
-EXPORT_SYMBOL(request_irq);
-
-/**
- * free_irq - free an interrupt
- * @irq: Interrupt line to free
- * @dev_id: Device identity to free
- *
- * Remove an interrupt handler. The handler is removed and if the
- * interrupt line is no longer in use by any driver it is disabled.
- * On a shared IRQ the caller must ensure the interrupt is disabled
- * on the card it drives before calling this function. The function
- * does not return until any executing interrupts for this IRQ
- * have completed.
- *
- * This function may be called from interrupt context.
- *
- * Bugs: Attempting to free an irq in a handler for the same irq hangs
- * the machine.
- */
-
-void free_irq(unsigned int irq, void *dev_id)
-{
- struct irq_source *source;
- struct irq_group *group;
- struct irq_level *level;
- struct irqaction **p, **pp;
- unsigned long flags;
-
- if ((irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP) >= NR_IRQ_GROUPS)
- return;
-
- group = irq_groups[irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP];
- if (!group)
- BUG();
-
- source = group->sources[irq & (NR_IRQ_ACTIONS_PER_GROUP - 1)];
- if (!source)
- BUG();
-
- level = source->level;
- p = &group->actions[irq & (NR_IRQ_ACTIONS_PER_GROUP - 1)];
-
- spin_lock_irqsave(&level->lock, flags);
-
- for (pp = p; *pp; pp = &(*pp)->next) {
- struct irqaction *action = *pp;
-
- if (action->dev_id != dev_id)
- continue;
-
- /* found it - remove from the list of entries */
- *pp = action->next;
-
- level->usage--;
-
- if (p == pp && group->control)
- group->control(group, irq & (NR_IRQ_ACTIONS_PER_GROUP - 1), 0);
-
- if (level->usage == 0)
- __set_MASK(level - frv_irq_levels);
-
- spin_unlock_irqrestore(&level->lock,flags);
-
-#ifdef CONFIG_SMP
- /* Wait to make sure it's not being used on another CPU */
- while (desc->status & IRQ_INPROGRESS)
- barrier();
-#endif
- kfree(action);
- return;
- }
-}
-
-EXPORT_SYMBOL(free_irq);
-
-/*
- * IRQ autodetection code..
- *
- * This depends on the fact that any interrupt that comes in on to an
- * unassigned IRQ will cause GxICR_DETECT to be set
- */
-
-static DECLARE_MUTEX(probe_sem);
-
-/**
- * probe_irq_on - begin an interrupt autodetect
- *
- * Commence probing for an interrupt. The interrupts are scanned
- * and a mask of potential interrupt lines is returned.
- *
- */
-
-unsigned long probe_irq_on(void)
-{
- down(&probe_sem);
- return 0;
}
-EXPORT_SYMBOL(probe_irq_on);
-
/*
- * Return a mask of triggered interrupts (this
- * can handle only legacy ISA interrupts).
- */
-
-/**
- * probe_irq_mask - scan a bitmap of interrupt lines
- * @val: mask of interrupts to consider
- *
- * Scan the ISA bus interrupt lines and return a bitmap of
- * active interrupts. The interrupt probe logic state is then
- * returned to its previous value.
- *
- * Note: we need to scan all the irq's even though we will
- * only return ISA irq numbers - just so that we reset them
- * all to a known state.
- */
-unsigned int probe_irq_mask(unsigned long xmask)
-{
- up(&probe_sem);
- return 0;
-}
-
-EXPORT_SYMBOL(probe_irq_mask);
-
-/*
- * Return the one interrupt that triggered (this can
- * handle any interrupt source).
- */
-
-/**
- * probe_irq_off - end an interrupt autodetect
- * @xmask: mask of potential interrupts (unused)
- *
- * Scans the unused interrupt lines and returns the line which
- * appears to have triggered the interrupt. If no interrupt was
- * found then zero is returned. If more than one interrupt is
- * found then minus the first candidate is returned to indicate
- * their is doubt.
- *
- * The interrupt probe logic state is returned to its previous
- * value.
- *
- * BUGS: When used in a module (which arguably shouldnt happen)
- * nothing prevents two IRQ probe callers from overlapping. The
- * results of this are non-optimal.
+ * initialise the interrupt system
*/
-
-int probe_irq_off(unsigned long xmask)
-{
- up(&probe_sem);
- return -1;
-}
-
-EXPORT_SYMBOL(probe_irq_off);
-
-/* this was setup_x86_irq but it seems pretty generic */
-int setup_irq(unsigned int irq, struct irqaction *new)
-{
- struct irq_source *source;
- struct irq_group *group;
- struct irq_level *level;
- struct irqaction **p, **pp;
- unsigned long flags;
-
- group = irq_groups[irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP];
- if (!group)
- BUG();
-
- source = group->sources[irq & (NR_IRQ_ACTIONS_PER_GROUP - 1)];
- if (!source)
- BUG();
-
- level = source->level;
-
- p = &group->actions[irq & (NR_IRQ_ACTIONS_PER_GROUP - 1)];
-
- /*
- * Some drivers like serial.c use request_irq() heavily,
- * so we have to be careful not to interfere with a
- * running system.
- */
- if (new->flags & SA_SAMPLE_RANDOM) {
- /*
- * This function might sleep, we want to call it first,
- * outside of the atomic block.
- * Yes, this might clear the entropy pool if the wrong
- * driver is attempted to be loaded, without actually
- * installing a new handler, but is this really a problem,
- * only the sysadmin is able to do this.
- */
- rand_initialize_irq(irq);
- }
-
- /* must juggle the interrupt processing stuff with interrupts disabled */
- spin_lock_irqsave(&level->lock, flags);
-
- /* can't share interrupts unless all parties agree to */
- if (level->usage != 0 && !(level->flags & new->flags & SA_SHIRQ)) {
- spin_unlock_irqrestore(&level->lock,flags);
- return -EBUSY;
- }
-
- /* add new interrupt at end of irq queue */
- pp = p;
- while (*pp)
- pp = &(*pp)->next;
-
- *pp = new;
-
- level->usage++;
- level->flags = new->flags;
-
- /* turn the interrupts on */
- if (level->usage == 1)
- __clr_MASK(level - frv_irq_levels);
-
- if (p == pp && group->control)
- group->control(group, irq & (NR_IRQ_ACTIONS_PER_GROUP - 1), 1);
-
- spin_unlock_irqrestore(&level->lock, flags);
- register_irq_proc(irq);
- return 0;
-}
-
-static struct proc_dir_entry * root_irq_dir;
-static struct proc_dir_entry * irq_dir [NR_IRQS];
-
-#define HEX_DIGITS 8
-
-static unsigned int parse_hex_value (const char *buffer,
- unsigned long count, unsigned long *ret)
-{
- unsigned char hexnum [HEX_DIGITS];
- unsigned long value;
- int i;
-
- if (!count)
- return -EINVAL;
- if (count > HEX_DIGITS)
- count = HEX_DIGITS;
- if (copy_from_user(hexnum, buffer, count))
- return -EFAULT;
-
- /*
- * Parse the first 8 characters as a hex string, any non-hex char
- * is end-of-string. '00e1', 'e1', '00E1', 'E1' are all the same.
- */
- value = 0;
-
- for (i = 0; i < count; i++) {
- unsigned int c = hexnum[i];
-
- switch (c) {
- case '0' ... '9': c -= '0'; break;
- case 'a' ... 'f': c -= 'a'-10; break;
- case 'A' ... 'F': c -= 'A'-10; break;
- default:
- goto out;
- }
- value = (value << 4) | c;
- }
-out:
- *ret = value;
- return 0;
-}
-
-
-static int prof_cpu_mask_read_proc (char *page, char **start, off_t off,
- int count, int *eof, void *data)
-{
- unsigned long *mask = (unsigned long *) data;
- if (count < HEX_DIGITS+1)
- return -EINVAL;
- return sprintf (page, "%08lx\n", *mask);
-}
-
-static int prof_cpu_mask_write_proc (struct file *file, const char *buffer,
- unsigned long count, void *data)
-{
- unsigned long *mask = (unsigned long *) data, full_count = count, err;
- unsigned long new_value;
-
- show_state();
- err = parse_hex_value(buffer, count, &new_value);
- if (err)
- return err;
-
- *mask = new_value;
- return full_count;
-}
-
-#define MAX_NAMELEN 10
-
-static void register_irq_proc (unsigned int irq)
-{
- char name [MAX_NAMELEN];
-
- if (!root_irq_dir || irq_dir[irq])
- return;
-
- memset(name, 0, MAX_NAMELEN);
- sprintf(name, "%d", irq);
-
- /* create /proc/irq/1234 */
- irq_dir[irq] = proc_mkdir(name, root_irq_dir);
-}
-
-unsigned long prof_cpu_mask = -1;
-
-void init_irq_proc (void)
+void __init init_IRQ(void)
{
- struct proc_dir_entry *entry;
- int i;
+ int level;
- /* create /proc/irq */
- root_irq_dir = proc_mkdir("irq", 0);
+ for (level = 1; level <= 14; level++)
+ set_irq_chip_and_handler(level, &frv_cpu_pic,
+ handle_level_irq);
- /* create /proc/irq/prof_cpu_mask */
- entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir);
- if (!entry)
- return;
+ set_irq_handler(IRQ_CPU_TIMER0, handle_edge_irq);
- entry->nlink = 1;
- entry->data = (void *)&prof_cpu_mask;
- entry->read_proc = prof_cpu_mask_read_proc;
- entry->write_proc = prof_cpu_mask_write_proc;
-
- /*
- * Create entries for all existing IRQs.
+ /* set the trigger levels for internal interrupt sources
+ * - timers all falling-edge
+ * - ERR0 is rising-edge
+ * - all others are high-level
*/
- for (i = 0; i < NR_IRQS; i++)
- register_irq_proc(i);
-}
+ __set_IITMR(0, 0x003f0000); /* DMA0-3, TIMER0-2 */
+ __set_IITMR(1, 0x20000000); /* ERR0-1, UART0-1, DMA4-7 */
+
+ /* route internal interrupts */
+ set_IRR(4, IRQ_DMA3_LEVEL, IRQ_DMA2_LEVEL, IRQ_DMA1_LEVEL,
+ IRQ_DMA0_LEVEL);
+ set_IRR(5, 0, IRQ_TIMER2_LEVEL, IRQ_TIMER1_LEVEL, IRQ_TIMER0_LEVEL);
+ set_IRR(6, IRQ_GDBSTUB_LEVEL, IRQ_GDBSTUB_LEVEL,
+ IRQ_UART1_LEVEL, IRQ_UART0_LEVEL);
+ set_IRR(7, IRQ_DMA7_LEVEL, IRQ_DMA6_LEVEL, IRQ_DMA5_LEVEL,
+ IRQ_DMA4_LEVEL);
+
+ /* route external interrupts */
+ set_IRR(2, IRQ_XIRQ7_LEVEL, IRQ_XIRQ6_LEVEL, IRQ_XIRQ5_LEVEL,
+ IRQ_XIRQ4_LEVEL);
+ set_IRR(3, IRQ_XIRQ3_LEVEL, IRQ_XIRQ2_LEVEL, IRQ_XIRQ1_LEVEL,
+ IRQ_XIRQ0_LEVEL);
+
+#if defined(CONFIG_MB93091_VDK)
+ __set_TM1(0x55550000); /* XIRQ7-0 all active low */
+#elif defined(CONFIG_MB93093_PDK)
+ __set_TM1(0x15550000); /* XIRQ7 active high, 6-0 all active low */
+#else
+#error dont know external IRQ trigger levels for this setup
+#endif
-/*****************************************************************************/
-/*
- * initialise the interrupt system
- */
-void __init init_IRQ(void)
-{
- route_cpu_irqs();
fpga_init();
#ifdef CONFIG_FUJITSU_MB93493
- route_mb93493_irqs();
+ mb93493_init();
#endif
-} /* end init_IRQ() */
+}
git.openpandora.org / pandora-kernel.git / blobdiff