diff options
author | Max Filippov <jcmvbkbc@gmail.com> | 2013-12-01 12:59:49 +0400 |
---|---|---|
committer | Chris Zankel <chris@zankel.net> | 2014-01-14 10:19:56 -0800 |
commit | cbd1de2e8e46207cead11034f92ea8a018b11189 (patch) | |
tree | aba9a9486122ed6bf3a849365424742645ad5766 /drivers | |
parent | c8f3a7dc0102fc9f89cc373c6dd7beb49916a695 (diff) | |
download | linux-cbd1de2e8e46207cead11034f92ea8a018b11189.tar.bz2 |
xtensa: move built-in PIC to drivers/irqchip
Extract xtensa built-in interrupt controller implementation from
xtensa/kernel/irq.c and move it to other irqchips, providing way to
instantiate it from the device tree.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/irqchip/Makefile | 1 | ||||
-rw-r--r-- | drivers/irqchip/irq-xtensa-pic.c | 108 |
2 files changed, 109 insertions, 0 deletions
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index c60b9010b152..c81a7f3f6506 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -22,3 +22,4 @@ obj-$(CONFIG_RENESAS_IRQC) += irq-renesas-irqc.o obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o obj-$(CONFIG_ARCH_VT8500) += irq-vt8500.o obj-$(CONFIG_TB10X_IRQC) += irq-tb10x.o +obj-$(CONFIG_XTENSA) += irq-xtensa-pic.o diff --git a/drivers/irqchip/irq-xtensa-pic.c b/drivers/irqchip/irq-xtensa-pic.c new file mode 100644 index 000000000000..7d71126d1ce5 --- /dev/null +++ b/drivers/irqchip/irq-xtensa-pic.c @@ -0,0 +1,108 @@ +/* + * Xtensa built-in interrupt controller + * + * Copyright (C) 2002 - 2013 Tensilica, Inc. + * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Chris Zankel <chris@zankel.net> + * Kevin Chea + */ + +#include <linux/interrupt.h> +#include <linux/irqdomain.h> +#include <linux/irq.h> +#include <linux/of.h> + +#include "irqchip.h" + +unsigned int cached_irq_mask; + +/* + * Device Tree IRQ specifier translation function which works with one or + * two cell bindings. First cell value maps directly to the hwirq number. + * Second cell if present specifies whether hwirq number is external (1) or + * internal (0). + */ +static int xtensa_pic_irq_domain_xlate(struct irq_domain *d, + struct device_node *ctrlr, + const u32 *intspec, unsigned int intsize, + unsigned long *out_hwirq, unsigned int *out_type) +{ + return xtensa_irq_domain_xlate(intspec, intsize, + intspec[0], intspec[0], + out_hwirq, out_type); +} + +static const struct irq_domain_ops xtensa_irq_domain_ops = { + .xlate = xtensa_pic_irq_domain_xlate, + .map = xtensa_irq_map, +}; + +static void xtensa_irq_mask(struct irq_data *d) +{ + cached_irq_mask &= ~(1 << d->hwirq); + set_sr(cached_irq_mask, intenable); +} + +static void xtensa_irq_unmask(struct irq_data *d) +{ + cached_irq_mask |= 1 << d->hwirq; + set_sr(cached_irq_mask, intenable); +} + +static void xtensa_irq_enable(struct irq_data *d) +{ + variant_irq_enable(d->hwirq); + xtensa_irq_unmask(d); +} + +static void xtensa_irq_disable(struct irq_data *d) +{ + xtensa_irq_mask(d); + variant_irq_disable(d->hwirq); +} + +static void xtensa_irq_ack(struct irq_data *d) +{ + set_sr(1 << d->hwirq, intclear); +} + +static int xtensa_irq_retrigger(struct irq_data *d) +{ + set_sr(1 << d->hwirq, intset); + return 1; +} + +static struct irq_chip xtensa_irq_chip = { + .name = "xtensa", + .irq_enable = xtensa_irq_enable, + .irq_disable = xtensa_irq_disable, + .irq_mask = xtensa_irq_mask, + .irq_unmask = xtensa_irq_unmask, + .irq_ack = xtensa_irq_ack, + .irq_retrigger = xtensa_irq_retrigger, +}; + +int __init xtensa_pic_init_legacy(struct device_node *interrupt_parent) +{ + struct irq_domain *root_domain = + irq_domain_add_legacy(NULL, NR_IRQS, 0, 0, + &xtensa_irq_domain_ops, &xtensa_irq_chip); + irq_set_default_host(root_domain); + return 0; +} + +static int __init xtensa_pic_init(struct device_node *np, + struct device_node *interrupt_parent) +{ + struct irq_domain *root_domain = + irq_domain_add_linear(np, NR_IRQS, &xtensa_irq_domain_ops, + &xtensa_irq_chip); + irq_set_default_host(root_domain); + return 0; +} +IRQCHIP_DECLARE(xtensa_irq_chip, "cdns,xtensa-pic", xtensa_pic_init); |