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-rw-r--r--arch/mn10300/kernel/irq.c356
1 files changed, 0 insertions, 356 deletions
diff --git a/arch/mn10300/kernel/irq.c b/arch/mn10300/kernel/irq.c
deleted file mode 100644
index c716437baa2c..000000000000
--- a/arch/mn10300/kernel/irq.c
+++ /dev/null
@@ -1,356 +0,0 @@
-/* MN10300 Arch-specific interrupt handling
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
-#include <linux/module.h>
-#include <linux/interrupt.h>
-#include <linux/kernel_stat.h>
-#include <linux/seq_file.h>
-#include <linux/cpumask.h>
-#include <asm/setup.h>
-#include <asm/serial-regs.h>
-
-unsigned long __mn10300_irq_enabled_epsw[NR_CPUS] __cacheline_aligned_in_smp = {
- [0 ... NR_CPUS - 1] = EPSW_IE | EPSW_IM_7
-};
-EXPORT_SYMBOL(__mn10300_irq_enabled_epsw);
-
-#ifdef CONFIG_SMP
-static char irq_affinity_online[NR_IRQS] = {
- [0 ... NR_IRQS - 1] = 0
-};
-
-#define NR_IRQ_WORDS ((NR_IRQS + 31) / 32)
-static unsigned long irq_affinity_request[NR_IRQ_WORDS] = {
- [0 ... NR_IRQ_WORDS - 1] = 0
-};
-#endif /* CONFIG_SMP */
-
-atomic_t irq_err_count;
-
-/*
- * MN10300 interrupt controller operations
- */
-static void mn10300_cpupic_ack(struct irq_data *d)
-{
- unsigned int irq = d->irq;
- unsigned long flags;
- u16 tmp;
-
- flags = arch_local_cli_save();
- GxICR_u8(irq) = GxICR_DETECT;
- tmp = GxICR(irq);
- arch_local_irq_restore(flags);
-}
-
-static void __mask_and_set_icr(unsigned int irq,
- unsigned int mask, unsigned int set)
-{
- unsigned long flags;
- u16 tmp;
-
- flags = arch_local_cli_save();
- tmp = GxICR(irq);
- GxICR(irq) = (tmp & mask) | set;
- tmp = GxICR(irq);
- arch_local_irq_restore(flags);
-}
-
-static void mn10300_cpupic_mask(struct irq_data *d)
-{
- __mask_and_set_icr(d->irq, GxICR_LEVEL, 0);
-}
-
-static void mn10300_cpupic_mask_ack(struct irq_data *d)
-{
- unsigned int irq = d->irq;
-#ifdef CONFIG_SMP
- unsigned long flags;
- u16 tmp;
-
- flags = arch_local_cli_save();
-
- if (!test_and_clear_bit(irq, irq_affinity_request)) {
- tmp = GxICR(irq);
- GxICR(irq) = (tmp & GxICR_LEVEL) | GxICR_DETECT;
- tmp = GxICR(irq);
- } else {
- u16 tmp2;
- tmp = GxICR(irq);
- GxICR(irq) = (tmp & GxICR_LEVEL);
- tmp2 = GxICR(irq);
-
- irq_affinity_online[irq] =
- cpumask_any_and(irq_data_get_affinity_mask(d),
- cpu_online_mask);
- CROSS_GxICR(irq, irq_affinity_online[irq]) =
- (tmp & (GxICR_LEVEL | GxICR_ENABLE)) | GxICR_DETECT;
- tmp = CROSS_GxICR(irq, irq_affinity_online[irq]);
- }
-
- arch_local_irq_restore(flags);
-#else /* CONFIG_SMP */
- __mask_and_set_icr(irq, GxICR_LEVEL, GxICR_DETECT);
-#endif /* CONFIG_SMP */
-}
-
-static void mn10300_cpupic_unmask(struct irq_data *d)
-{
- __mask_and_set_icr(d->irq, GxICR_LEVEL, GxICR_ENABLE);
-}
-
-static void mn10300_cpupic_unmask_clear(struct irq_data *d)
-{
- unsigned int irq = d->irq;
- /* the MN10300 PIC latches its interrupt request bit, even after the
- * device has ceased to assert its interrupt line and the interrupt
- * channel has been disabled in the PIC, so for level-triggered
- * interrupts we need to clear the request bit when we re-enable */
-#ifdef CONFIG_SMP
- unsigned long flags;
- u16 tmp;
-
- flags = arch_local_cli_save();
-
- if (!test_and_clear_bit(irq, irq_affinity_request)) {
- tmp = GxICR(irq);
- GxICR(irq) = (tmp & GxICR_LEVEL) | GxICR_ENABLE | GxICR_DETECT;
- tmp = GxICR(irq);
- } else {
- tmp = GxICR(irq);
-
- irq_affinity_online[irq] = cpumask_any_and(irq_data_get_affinity_mask(d),
- cpu_online_mask);
- CROSS_GxICR(irq, irq_affinity_online[irq]) = (tmp & GxICR_LEVEL) | GxICR_ENABLE | GxICR_DETECT;
- tmp = CROSS_GxICR(irq, irq_affinity_online[irq]);
- }
-
- arch_local_irq_restore(flags);
-#else /* CONFIG_SMP */
- __mask_and_set_icr(irq, GxICR_LEVEL, GxICR_ENABLE | GxICR_DETECT);
-#endif /* CONFIG_SMP */
-}
-
-#ifdef CONFIG_SMP
-static int
-mn10300_cpupic_setaffinity(struct irq_data *d, const struct cpumask *mask,
- bool force)
-{
- unsigned long flags;
-
- flags = arch_local_cli_save();
- set_bit(d->irq, irq_affinity_request);
- arch_local_irq_restore(flags);
- return 0;
-}
-#endif /* CONFIG_SMP */
-
-/*
- * MN10300 PIC level-triggered IRQ handling.
- *
- * The PIC has no 'ACK' function per se. It is possible to clear individual
- * channel latches, but each latch relatches whether or not the channel is
- * masked, so we need to clear the latch when we unmask the channel.
- *
- * Also for this reason, we don't supply an ack() op (it's unused anyway if
- * mask_ack() is provided), and mask_ack() just masks.
- */
-static struct irq_chip mn10300_cpu_pic_level = {
- .name = "cpu_l",
- .irq_disable = mn10300_cpupic_mask,
- .irq_enable = mn10300_cpupic_unmask_clear,
- .irq_ack = NULL,
- .irq_mask = mn10300_cpupic_mask,
- .irq_mask_ack = mn10300_cpupic_mask,
- .irq_unmask = mn10300_cpupic_unmask_clear,
-#ifdef CONFIG_SMP
- .irq_set_affinity = mn10300_cpupic_setaffinity,
-#endif
-};
-
-/*
- * MN10300 PIC edge-triggered IRQ handling.
- *
- * We use the latch clearing function of the PIC as the 'ACK' function.
- */
-static struct irq_chip mn10300_cpu_pic_edge = {
- .name = "cpu_e",
- .irq_disable = mn10300_cpupic_mask,
- .irq_enable = mn10300_cpupic_unmask,
- .irq_ack = mn10300_cpupic_ack,
- .irq_mask = mn10300_cpupic_mask,
- .irq_mask_ack = mn10300_cpupic_mask_ack,
- .irq_unmask = mn10300_cpupic_unmask,
-#ifdef CONFIG_SMP
- .irq_set_affinity = mn10300_cpupic_setaffinity,
-#endif
-};
-
-/*
- * 'what should we do if we get a hw irq event on an illegal vector'.
- * each architecture has to answer this themselves.
- */
-void ack_bad_irq(int irq)
-{
- printk(KERN_WARNING "unexpected IRQ trap at vector %02x\n", irq);
-}
-
-/*
- * change the level at which an IRQ executes
- * - must not be called whilst interrupts are being processed!
- */
-void set_intr_level(int irq, u16 level)
-{
- BUG_ON(in_interrupt());
-
- __mask_and_set_icr(irq, GxICR_ENABLE, level);
-}
-
-/*
- * mark an interrupt to be ACK'd after interrupt handlers have been run rather
- * than before
- */
-void mn10300_set_lateack_irq_type(int irq)
-{
- irq_set_chip_and_handler(irq, &mn10300_cpu_pic_level,
- handle_level_irq);
-}
-
-/*
- * initialise the interrupt system
- */
-void __init init_IRQ(void)
-{
- int irq;
-
- for (irq = 0; irq < NR_IRQS; irq++)
- if (irq_get_chip(irq) == &no_irq_chip)
- /* due to the PIC latching interrupt requests, even
- * when the IRQ is disabled, IRQ_PENDING is superfluous
- * and we can use handle_level_irq() for edge-triggered
- * interrupts */
- irq_set_chip_and_handler(irq, &mn10300_cpu_pic_edge,
- handle_level_irq);
-
- unit_init_IRQ();
-}
-
-/*
- * handle normal device IRQs
- */
-asmlinkage void do_IRQ(void)
-{
- unsigned long sp, epsw, irq_disabled_epsw, old_irq_enabled_epsw;
- unsigned int cpu_id = smp_processor_id();
- int irq;
-
- sp = current_stack_pointer();
- BUG_ON(sp - (sp & ~(THREAD_SIZE - 1)) < STACK_WARN);
-
- /* make sure local_irq_enable() doesn't muck up the interrupt priority
- * setting in EPSW */
- old_irq_enabled_epsw = __mn10300_irq_enabled_epsw[cpu_id];
- local_save_flags(epsw);
- __mn10300_irq_enabled_epsw[cpu_id] = EPSW_IE | (EPSW_IM & epsw);
- irq_disabled_epsw = EPSW_IE | MN10300_CLI_LEVEL;
-
-#ifdef CONFIG_MN10300_WD_TIMER
- __IRQ_STAT(cpu_id, __irq_count)++;
-#endif
-
- irq_enter();
-
- for (;;) {
- /* ask the interrupt controller for the next IRQ to process
- * - the result we get depends on EPSW.IM
- */
- irq = IAGR & IAGR_GN;
- if (!irq)
- break;
-
- local_irq_restore(irq_disabled_epsw);
-
- generic_handle_irq(irq >> 2);
-
- /* restore IRQ controls for IAGR access */
- local_irq_restore(epsw);
- }
-
- __mn10300_irq_enabled_epsw[cpu_id] = old_irq_enabled_epsw;
-
- irq_exit();
-}
-
-/*
- * Display interrupt management information through /proc/interrupts
- */
-int arch_show_interrupts(struct seq_file *p, int prec)
-{
-#ifdef CONFIG_MN10300_WD_TIMER
- int j;
-
- seq_printf(p, "%*s: ", prec, "NMI");
- for (j = 0; j < NR_CPUS; j++)
- if (cpu_online(j))
- seq_printf(p, "%10u ", nmi_count(j));
- seq_putc(p, '\n');
-#endif
-
- seq_printf(p, "%*s: ", prec, "ERR");
- seq_printf(p, "%10u\n", atomic_read(&irq_err_count));
- return 0;
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-void migrate_irqs(void)
-{
- int irq;
- unsigned int self, new;
- unsigned long flags;
-
- self = smp_processor_id();
- for (irq = 0; irq < NR_IRQS; irq++) {
- struct irq_data *data = irq_get_irq_data(irq);
- struct cpumask *mask = irq_data_get_affinity_mask(data);
-
- if (irqd_is_per_cpu(data))
- continue;
-
- if (cpumask_test_cpu(self, mask) &&
- !cpumask_intersects(&irq_affinity[irq], cpu_online_mask)) {
- int cpu_id;
- cpu_id = cpumask_first(cpu_online_mask);
- cpumask_set_cpu(cpu_id, mask);
- }
- /* We need to operate irq_affinity_online atomically. */
- arch_local_cli_save(flags);
- if (irq_affinity_online[irq] == self) {
- u16 x, tmp;
-
- x = GxICR(irq);
- GxICR(irq) = x & GxICR_LEVEL;
- tmp = GxICR(irq);
-
- new = cpumask_any_and(mask, cpu_online_mask);
- irq_affinity_online[irq] = new;
-
- CROSS_GxICR(irq, new) =
- (x & GxICR_LEVEL) | GxICR_DETECT;
- tmp = CROSS_GxICR(irq, new);
-
- x &= GxICR_LEVEL | GxICR_ENABLE;
- if (GxICR(irq) & GxICR_REQUEST)
- x |= GxICR_REQUEST | GxICR_DETECT;
- CROSS_GxICR(irq, new) = x;
- tmp = CROSS_GxICR(irq, new);
- }
- arch_local_irq_restore(flags);
- }
-}
-#endif /* CONFIG_HOTPLUG_CPU */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.