diff options
Diffstat (limited to 'kernel/arch/arm/mach-ks8695/irq.c')
| -rw-r--r-- | kernel/arch/arm/mach-ks8695/irq.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-ks8695/irq.c b/kernel/arch/arm/mach-ks8695/irq.c new file mode 100644 index 000000000..76802aac0 --- /dev/null +++ b/kernel/arch/arm/mach-ks8695/irq.c @@ -0,0 +1,177 @@ +/* + * arch/arm/mach-ks8695/irq.c + * + * Copyright (C) 2006 Ben Dooks <ben@simtec.co.uk> + * Copyright (C) 2006 Simtec Electronics + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/device.h> +#include <linux/io.h> + +#include <mach/hardware.h> +#include <asm/irq.h> + +#include <asm/mach/irq.h> + +#include <mach/regs-irq.h> +#include <mach/regs-gpio.h> + +static void ks8695_irq_mask(struct irq_data *d) +{ + unsigned long inten; + + inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN); + inten &= ~(1 << d->irq); + + __raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN); +} + +static void ks8695_irq_unmask(struct irq_data *d) +{ + unsigned long inten; + + inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN); + inten |= (1 << d->irq); + + __raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN); +} + +static void ks8695_irq_ack(struct irq_data *d) +{ + __raw_writel((1 << d->irq), KS8695_IRQ_VA + KS8695_INTST); +} + + +static struct irq_chip ks8695_irq_level_chip; +static struct irq_chip ks8695_irq_edge_chip; + + +static int ks8695_irq_set_type(struct irq_data *d, unsigned int type) +{ + unsigned long ctrl, mode; + unsigned short level_triggered = 0; + + ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC); + + switch (type) { + case IRQ_TYPE_LEVEL_HIGH: + mode = IOPC_TM_HIGH; + level_triggered = 1; + break; + case IRQ_TYPE_LEVEL_LOW: + mode = IOPC_TM_LOW; + level_triggered = 1; + break; + case IRQ_TYPE_EDGE_RISING: + mode = IOPC_TM_RISING; + break; + case IRQ_TYPE_EDGE_FALLING: + mode = IOPC_TM_FALLING; + break; + case IRQ_TYPE_EDGE_BOTH: + mode = IOPC_TM_EDGE; + break; + default: + return -EINVAL; + } + + switch (d->irq) { + case KS8695_IRQ_EXTERN0: + ctrl &= ~IOPC_IOEINT0TM; + ctrl |= IOPC_IOEINT0_MODE(mode); + break; + case KS8695_IRQ_EXTERN1: + ctrl &= ~IOPC_IOEINT1TM; + ctrl |= IOPC_IOEINT1_MODE(mode); + break; + case KS8695_IRQ_EXTERN2: + ctrl &= ~IOPC_IOEINT2TM; + ctrl |= IOPC_IOEINT2_MODE(mode); + break; + case KS8695_IRQ_EXTERN3: + ctrl &= ~IOPC_IOEINT3TM; + ctrl |= IOPC_IOEINT3_MODE(mode); + break; + default: + return -EINVAL; + } + + if (level_triggered) { + irq_set_chip_and_handler(d->irq, &ks8695_irq_level_chip, + handle_level_irq); + } + else { + irq_set_chip_and_handler(d->irq, &ks8695_irq_edge_chip, + handle_edge_irq); + } + + __raw_writel(ctrl, KS8695_GPIO_VA + KS8695_IOPC); + return 0; +} + +static struct irq_chip ks8695_irq_level_chip = { + .irq_ack = ks8695_irq_mask, + .irq_mask = ks8695_irq_mask, + .irq_unmask = ks8695_irq_unmask, + .irq_set_type = ks8695_irq_set_type, +}; + +static struct irq_chip ks8695_irq_edge_chip = { + .irq_ack = ks8695_irq_ack, + .irq_mask = ks8695_irq_mask, + .irq_unmask = ks8695_irq_unmask, + .irq_set_type = ks8695_irq_set_type, +}; + +void __init ks8695_init_irq(void) +{ + unsigned int irq; + + /* Disable all interrupts initially */ + __raw_writel(0, KS8695_IRQ_VA + KS8695_INTMC); + __raw_writel(0, KS8695_IRQ_VA + KS8695_INTEN); + + for (irq = 0; irq < NR_IRQS; irq++) { + switch (irq) { + /* Level-triggered interrupts */ + case KS8695_IRQ_BUS_ERROR: + case KS8695_IRQ_UART_MODEM_STATUS: + case KS8695_IRQ_UART_LINE_STATUS: + case KS8695_IRQ_UART_RX: + case KS8695_IRQ_COMM_TX: + case KS8695_IRQ_COMM_RX: + irq_set_chip_and_handler(irq, + &ks8695_irq_level_chip, + handle_level_irq); + break; + + /* Edge-triggered interrupts */ + default: + /* clear pending bit */ + ks8695_irq_ack(irq_get_irq_data(irq)); + irq_set_chip_and_handler(irq, + &ks8695_irq_edge_chip, + handle_edge_irq); + } + + set_irq_flags(irq, IRQF_VALID); + } +} |