diff options
author | Richard Kuo <rkuo@codeaurora.org> | 2011-10-31 18:42:51 -0500 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-11-01 07:34:19 -0700 |
commit | 2ac211bc423a0e62fe3ca3d78954de3174ae41f2 (patch) | |
tree | 590c1226cf8cf1243ee5ff0c2640a348417288d1 /arch/hexagon/kernel/irq_cpu.c | |
parent | e03167b26b7fcffea11e82f5672472a23a88ffbc (diff) |
Hexagon: Add interrupts
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Linas Vepstas <linas@codeaurora.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/hexagon/kernel/irq_cpu.c')
-rw-r--r-- | arch/hexagon/kernel/irq_cpu.c | 90 |
1 files changed, 90 insertions, 0 deletions
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 <linux/interrupt.h> +#include <asm/irq.h> +#include <asm/hexagon_vm.h> + +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); + } +} |