| /* 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(d->affinity, 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(d->affinity, |
| 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); |
| |
| if (irqd_is_per_cpu(data)) |
| continue; |
| |
| if (cpumask_test_cpu(self, &data->affinity) && |
| !cpumask_intersects(&irq_affinity[irq], cpu_online_mask)) { |
| int cpu_id; |
| cpu_id = cpumask_first(cpu_online_mask); |
| cpumask_set_cpu(cpu_id, &data->affinity); |
| } |
| /* 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(&data->affinity, |
| 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 */ |