From 9dce6f0394092e0964b3647cb48541369d184b59 Mon Sep 17 00:00:00 2001 From: Richard Kuo Date: Tue, 13 Sep 2011 10:37:59 +1000 Subject: [PATCH] Hexagon: Add interrupts Removed init_IRQ wrapper and fixed up some comments. Signed-off-by: Richard Kuo Acked-by: Arnd Bergmann --- arch/hexagon/include/asm/irq.h | 36 ++++++++++++++ arch/hexagon/kernel/irq.c | 67 +++++++++++++++++++++++++ arch/hexagon/kernel/irq_cpu.c | 90 ++++++++++++++++++++++++++++++++++ 3 files changed, 193 insertions(+) create mode 100644 arch/hexagon/include/asm/irq.h create mode 100644 arch/hexagon/kernel/irq.c create mode 100644 arch/hexagon/kernel/irq_cpu.c diff --git a/arch/hexagon/include/asm/irq.h b/arch/hexagon/include/asm/irq.h new file mode 100644 index 000000000000..ded8c15cf3e5 --- /dev/null +++ b/arch/hexagon/include/asm/irq.h @@ -0,0 +1,36 @@ +/* + * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#ifndef _ASM_IRQ_H_ +#define _ASM_IRQ_H_ + +/* Number of first-level interrupts associated with the CPU core. */ +#define HEXAGON_CPUINTS 32 + +/* + * Must define NR_IRQS before including + * 64 == the two SIRC's, 176 == the two gpio's + * + * IRQ configuration is still in flux; defining this to a comfortably + * large number. + */ +#define NR_IRQS 512 + +#include + +#endif diff --git a/arch/hexagon/kernel/irq.c b/arch/hexagon/kernel/irq.c new file mode 100644 index 000000000000..f252e7c46033 --- /dev/null +++ b/arch/hexagon/kernel/irq.c @@ -0,0 +1,67 @@ +/* + * Interrupt support for Hexagon + * + * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#include +#include +#include +#include +#include +#include + +int show_interrupts(struct seq_file *p, void *v) +{ + int i = *(loff_t *)v, cpu; + struct irqaction *action; + unsigned long flags; + + if (i == 0) { + seq_puts(p, " "); + for_each_online_cpu(cpu) + seq_printf(p, "CPU%d ", cpu); + seq_putc(p, '\n'); + } + + if (i < NR_IRQS) { + struct irq_desc *desc = irq_to_desc(i); + + raw_spin_lock_irqsave(&desc->lock, flags); + + action = irq_desc[i].action; + if (action) { + seq_printf(p, "%3d: ", i); + for_each_online_cpu(cpu) { + seq_printf(p, "%10u ", kstat_irqs_cpu(i, cpu)); + } + seq_printf(p, " %8s", + irq_desc_get_chip(&irq_desc[i])->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'); + } + raw_spin_unlock_irqrestore(&desc->lock, flags); + } + + return 0; +} diff --git a/arch/hexagon/kernel/irq_cpu.c b/arch/hexagon/kernel/irq_cpu.c new file mode 100644 index 000000000000..d4416a1a431e --- /dev/null +++ b/arch/hexagon/kernel/irq_cpu.c @@ -0,0 +1,90 @@ +/* + * First-level interrupt controller model for Hexagon. + * + * Copyright (c) 2010-2011 Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#include +#include +#include + +static void mask_irq(struct irq_data *data) +{ + __vmintop_locdis((long) data->irq); +} + +static void mask_irq_num(unsigned int irq) +{ + __vmintop_locdis((long) irq); +} + +static void unmask_irq(struct irq_data *data) +{ + __vmintop_locen((long) data->irq); +} + +/* This is actually all we need for handle_fasteoi_irq */ +static void eoi_irq(struct irq_data *data) +{ + __vmintop_globen((long) data->irq); +} + +/* Power mamangement wake call. We don't need this, however, + * if this is absent, then an -ENXIO error is returned to the + * msm_serial driver, and it fails to correctly initialize. + * This is a bug in the msm_serial driver, but, for now, we + * work around it here, by providing this bogus handler. + * XXX FIXME!!! remove this when msm_serial is fixed. + */ +static int set_wake(struct irq_data *data, unsigned int on) +{ + return 0; +} + +static struct irq_chip hexagon_irq_chip = { + .name = "HEXAGON", + .irq_mask = mask_irq, + .irq_unmask = unmask_irq, + .irq_set_wake = set_wake, + .irq_eoi = eoi_irq +}; + +/** + * The hexagon core comes with a first-level interrupt controller + * with 32 total possible interrupts. When the core is embedded + * into different systems/platforms, it is typically wrapped by + * macro cells that provide one or more second-level interrupt + * controllers that are cascaded into one or more of the first-level + * interrupts handled here. The precise wiring of these other + * irqs varies from platform to platform, and are set up & configured + * in the platform-specific files. + * + * The first-level interrupt controller is wrapped by the VM, which + * virtualizes the interrupt controller for us. It provides a very + * simple, fast & efficient API, and so the fasteoi handler is + * appropriate for this case. + */ +void __init init_IRQ(void) +{ + int irq; + + for (irq = 0; irq < HEXAGON_CPUINTS; irq++) { + mask_irq_num(irq); + irq_set_chip_and_handler(irq, &hexagon_irq_chip, + handle_fasteoi_irq); + } +} -- 2.39.5