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