diff options
Diffstat (limited to 'arch/arm/mach-orion/irq.c')
| -rw-r--r-- | arch/arm/mach-orion/irq.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/arch/arm/mach-orion/irq.c b/arch/arm/mach-orion/irq.c new file mode 100644 index 000000000000..585a0fb06262 --- /dev/null +++ b/arch/arm/mach-orion/irq.c @@ -0,0 +1,160 @@ +/* + * arch/arm/mach-orion/irq.c + * + * Core IRQ functions for Marvell Orion System On Chip + * + * Maintainer: Tzachi Perelstein <tzachi@marvell.com> + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <asm/gpio.h> +#include <asm/arch/orion.h> +#include "common.h" + +/***************************************************************************** + * Orion GPIO IRQ + ****************************************************************************/ +static void orion_gpio_irq_mask(u32 irq) +{ + int pin = irq_to_gpio(irq); + orion_clrbits(GPIO_LEVEL_MASK, 1 << pin); +} + +static void orion_gpio_irq_unmask(u32 irq) +{ + int pin = irq_to_gpio(irq); + orion_setbits(GPIO_LEVEL_MASK, 1 << pin); +} + +static int orion_gpio_set_irq_type(u32 irq, u32 type) +{ + int pin = irq_to_gpio(irq); + + if ((orion_read(GPIO_IO_CONF) & (1 << pin)) == 0) { + printk(KERN_ERR "orion_gpio_set_irq_type failed " + "(irq %d, pin %d).\n", irq, pin); + return -EINVAL; + } + + switch (type) { + case IRQT_HIGH: + orion_clrbits(GPIO_IN_POL, (1 << pin)); + break; + case IRQT_LOW: + orion_setbits(GPIO_IN_POL, (1 << pin)); + break; + default: + printk(KERN_ERR "failed to set irq=%d (type=%d)\n", irq, type); + return -EINVAL; + } + + return 0; +} + +static struct irq_chip orion_gpio_irq_chip = { + .name = "Orion-IRQ-GPIO", + .ack = orion_gpio_irq_mask, + .mask = orion_gpio_irq_mask, + .unmask = orion_gpio_irq_unmask, + .set_type = orion_gpio_set_irq_type, +}; + +static void orion_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) +{ + int i; + u32 cause, shift; + + BUG_ON(irq < IRQ_ORION_GPIO_0_7 || irq > IRQ_ORION_GPIO_24_31); + shift = (irq - IRQ_ORION_GPIO_0_7) * 8; + cause = orion_read(GPIO_EDGE_CAUSE) & orion_read(GPIO_LEVEL_MASK); + cause &= (0xff << shift); + + for (i = shift; i < shift + 8; i++) { + if (cause & (1 << i)) { + int gpio_irq = i + IRQ_ORION_GPIO_START; + if (gpio_irq > 0) { + desc = irq_desc + gpio_irq; + desc_handle_irq(gpio_irq, desc); + } else { + printk(KERN_ERR "orion_gpio_irq_handler error, " + "invalid irq %d\n", gpio_irq); + } + } + } +} + +static void __init orion_init_gpio_irq(void) +{ + int i; + + /* + * Mask and clear GPIO IRQ interrupts + */ + orion_write(GPIO_LEVEL_MASK, 0x0); + orion_write(GPIO_EDGE_CAUSE, 0x0); + + /* + * Register chained level handlers for GPIO IRQs + */ + for (i = IRQ_ORION_GPIO_START; i < NR_IRQS; i++) { + set_irq_chip(i, &orion_gpio_irq_chip); + set_irq_handler(i, handle_level_irq); + set_irq_flags(i, IRQF_VALID); + } + set_irq_chained_handler(IRQ_ORION_GPIO_0_7, orion_gpio_irq_handler); + set_irq_chained_handler(IRQ_ORION_GPIO_8_15, orion_gpio_irq_handler); + set_irq_chained_handler(IRQ_ORION_GPIO_16_23, orion_gpio_irq_handler); + set_irq_chained_handler(IRQ_ORION_GPIO_24_31, orion_gpio_irq_handler); +} + +/***************************************************************************** + * Orion Main IRQ + ****************************************************************************/ +static void orion_main_irq_mask(u32 irq) +{ + orion_clrbits(MAIN_IRQ_MASK, 1 << irq); +} + +static void orion_main_irq_unmask(u32 irq) +{ + orion_setbits(MAIN_IRQ_MASK, 1 << irq); +} + +static struct irq_chip orion_main_irq_chip = { + .name = "Orion-IRQ-Main", + .ack = orion_main_irq_mask, + .mask = orion_main_irq_mask, + .unmask = orion_main_irq_unmask, +}; + +static void __init orion_init_main_irq(void) +{ + int i; + + /* + * Mask and clear Main IRQ interrupts + */ + orion_write(MAIN_IRQ_MASK, 0x0); + orion_write(MAIN_IRQ_CAUSE, 0x0); + + /* + * Register level handler for Main IRQs + */ + for (i = 0; i < IRQ_ORION_GPIO_START; i++) { + set_irq_chip(i, &orion_main_irq_chip); + set_irq_handler(i, handle_level_irq); + set_irq_flags(i, IRQF_VALID); + } +} + +void __init orion_init_irq(void) +{ + orion_init_main_irq(); + orion_init_gpio_irq(); +} |
