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[ARM] Orion: share GPIO IRQ handling code
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Split off Orion GPIO IRQ handling code into plat-orion/.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
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Lennert Buytenhek authored and Nicolas Pitre committed Dec 20, 2008
1 parent 9569dae commit 0733231
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Showing 5 changed files with 200 additions and 172 deletions.
3 changes: 3 additions & 0 deletions arch/arm/mach-orion5x/include/mach/gpio.h
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#define GPIO_BLINK_EN(pin) ORION5X_DEV_BUS_REG(0x108)
#define GPIO_IN_POL(pin) ORION5X_DEV_BUS_REG(0x10c)
#define GPIO_DATA_IN(pin) ORION5X_DEV_BUS_REG(0x110)
#define GPIO_EDGE_CAUSE(pin) ORION5X_DEV_BUS_REG(0x114)
#define GPIO_EDGE_MASK(pin) ORION5X_DEV_BUS_REG(0x118)
#define GPIO_LEVEL_MASK(pin) ORION5X_DEV_BUS_REG(0x11c)

static inline int gpio_to_irq(int pin)
{
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3 changes: 0 additions & 3 deletions arch/arm/mach-orion5x/include/mach/orion5x.h
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Expand Up @@ -134,9 +134,6 @@
#define MPP_16_19_CTRL ORION5X_DEV_BUS_REG(0x050)
#define MPP_DEV_CTRL ORION5X_DEV_BUS_REG(0x008)
#define MPP_RESET_SAMPLE ORION5X_DEV_BUS_REG(0x010)
#define GPIO_EDGE_CAUSE ORION5X_DEV_BUS_REG(0x114)
#define GPIO_EDGE_MASK ORION5X_DEV_BUS_REG(0x118)
#define GPIO_LEVEL_MASK ORION5X_DEV_BUS_REG(0x11c)
#define DEV_BANK_0_PARAM ORION5X_DEV_BUS_REG(0x45c)
#define DEV_BANK_1_PARAM ORION5X_DEV_BUS_REG(0x460)
#define DEV_BANK_2_PARAM ORION5X_DEV_BUS_REG(0x464)
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183 changes: 14 additions & 169 deletions arch/arm/mach-orion5x/irq.c
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Expand Up @@ -19,193 +19,38 @@
#include <plat/irq.h>
#include "common.h"

/*****************************************************************************
* Orion GPIO IRQ
*
* GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
* value of the line or the opposite value.
*
* Level IRQ handlers: DATA_IN is used directly as cause register.
* Interrupt are masked by LEVEL_MASK registers.
* Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
* Interrupt are masked by EDGE_MASK registers.
* Both-edge handlers: Similar to regular Edge handlers, but also swaps
* the polarity to catch the next line transaction.
* This is a race condition that might not perfectly
* work on some use cases.
*
* Every eight GPIO lines are grouped (OR'ed) before going up to main
* cause register.
*
* EDGE cause mask
* data-in /--------| |-----| |----\
* -----| |----- ---- to main cause reg
* X \----------------| |----/
* polarity LEVEL mask
*
****************************************************************************/
static void orion5x_gpio_irq_ack(u32 irq)
{
int pin = irq_to_gpio(irq);
if (irq_desc[irq].status & IRQ_LEVEL)
/*
* Mask bit for level interrupt
*/
orion5x_clrbits(GPIO_LEVEL_MASK, 1 << pin);
else
/*
* Clear casue bit for egde interrupt
*/
orion5x_clrbits(GPIO_EDGE_CAUSE, 1 << pin);
}

static void orion5x_gpio_irq_mask(u32 irq)
{
int pin = irq_to_gpio(irq);
if (irq_desc[irq].status & IRQ_LEVEL)
orion5x_clrbits(GPIO_LEVEL_MASK, 1 << pin);
else
orion5x_clrbits(GPIO_EDGE_MASK, 1 << pin);
}

static void orion5x_gpio_irq_unmask(u32 irq)
static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
{
int pin = irq_to_gpio(irq);
if (irq_desc[irq].status & IRQ_LEVEL)
orion5x_setbits(GPIO_LEVEL_MASK, 1 << pin);
else
orion5x_setbits(GPIO_EDGE_MASK, 1 << pin);
}

static int orion5x_gpio_set_irq_type(u32 irq, u32 type)
{
int pin = irq_to_gpio(irq);
struct irq_desc *desc;

if ((readl(GPIO_IO_CONF(pin)) & (1 << pin)) == 0) {
printk(KERN_ERR "orion5x_gpio_set_irq_type failed "
"(irq %d, pin %d).\n", irq, pin);
return -EINVAL;
}

desc = irq_desc + irq;

switch (type) {
case IRQ_TYPE_LEVEL_HIGH:
desc->handle_irq = handle_level_irq;
desc->status |= IRQ_LEVEL;
orion5x_clrbits(GPIO_IN_POL(pin), (1 << pin));
break;
case IRQ_TYPE_LEVEL_LOW:
desc->handle_irq = handle_level_irq;
desc->status |= IRQ_LEVEL;
orion5x_setbits(GPIO_IN_POL(pin), (1 << pin));
break;
case IRQ_TYPE_EDGE_RISING:
desc->handle_irq = handle_edge_irq;
desc->status &= ~IRQ_LEVEL;
orion5x_clrbits(GPIO_IN_POL(pin), (1 << pin));
break;
case IRQ_TYPE_EDGE_FALLING:
desc->handle_irq = handle_edge_irq;
desc->status &= ~IRQ_LEVEL;
orion5x_setbits(GPIO_IN_POL(pin), (1 << pin));
break;
case IRQ_TYPE_EDGE_BOTH:
desc->handle_irq = handle_edge_irq;
desc->status &= ~IRQ_LEVEL;
/*
* set initial polarity based on current input level
*/
if ((readl(GPIO_IN_POL(pin)) ^ readl(GPIO_DATA_IN(pin)))
& (1 << pin))
orion5x_setbits(GPIO_IN_POL(pin), (1 << pin)); /* falling */
else
orion5x_clrbits(GPIO_IN_POL(pin), (1 << pin)); /* rising */

break;
default:
printk(KERN_ERR "failed to set irq=%d (type=%d)\n", irq, type);
return -EINVAL;
}

desc->status &= ~IRQ_TYPE_SENSE_MASK;
desc->status |= type & IRQ_TYPE_SENSE_MASK;

return 0;
}

static struct irq_chip orion5x_gpio_irq_chip = {
.name = "Orion-IRQ-GPIO",
.ack = orion5x_gpio_irq_ack,
.mask = orion5x_gpio_irq_mask,
.unmask = orion5x_gpio_irq_unmask,
.set_type = orion5x_gpio_set_irq_type,
};

static void orion5x_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
{
u32 cause, offs, pin;

BUG_ON(irq < IRQ_ORION5X_GPIO_0_7 || irq > IRQ_ORION5X_GPIO_24_31);
offs = (irq - IRQ_ORION5X_GPIO_0_7) * 8;
cause = (readl(GPIO_DATA_IN(offs)) & readl(GPIO_LEVEL_MASK)) |
(readl(GPIO_EDGE_CAUSE) & readl(GPIO_EDGE_MASK));

for (pin = offs; pin < offs + 8; pin++) {
if (cause & (1 << pin)) {
irq = gpio_to_irq(pin);
desc = irq_desc + irq;
if ((desc->status & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
/* Swap polarity (race with GPIO line) */
u32 polarity = readl(GPIO_IN_POL(pin));
polarity ^= 1 << pin;
writel(polarity, GPIO_IN_POL(pin));
}
generic_handle_irq(irq);
}
}
orion_gpio_irq_handler((irq - IRQ_ORION5X_GPIO_0_7) << 3);
}

static void __init orion5x_init_gpio_irq(void)
void __init orion5x_init_irq(void)
{
int i;
struct irq_desc *desc;

orion_irq_init(0, (void __iomem *)MAIN_IRQ_MASK);

/*
* Mask and clear GPIO IRQ interrupts
*/
writel(0x0, GPIO_LEVEL_MASK);
writel(0x0, GPIO_EDGE_MASK);
writel(0x0, GPIO_EDGE_CAUSE);
writel(0x0, GPIO_LEVEL_MASK(0));
writel(0x0, GPIO_EDGE_MASK(0));
writel(0x0, GPIO_EDGE_CAUSE(0));

/*
* Register chained level handlers for GPIO IRQs by default.
* User can use set_type() if he wants to use edge types handlers.
*/
for (i = IRQ_ORION5X_GPIO_START; i < NR_IRQS; i++) {
set_irq_chip(i, &orion5x_gpio_irq_chip);
set_irq_chip(i, &orion_gpio_irq_level_chip);
set_irq_handler(i, handle_level_irq);
desc = irq_desc + i;
desc->status |= IRQ_LEVEL;
irq_desc[i].status |= IRQ_LEVEL;
set_irq_flags(i, IRQF_VALID);
}
set_irq_chained_handler(IRQ_ORION5X_GPIO_0_7, orion5x_gpio_irq_handler);
set_irq_chained_handler(IRQ_ORION5X_GPIO_8_15, orion5x_gpio_irq_handler);
set_irq_chained_handler(IRQ_ORION5X_GPIO_16_23, orion5x_gpio_irq_handler);
set_irq_chained_handler(IRQ_ORION5X_GPIO_24_31, orion5x_gpio_irq_handler);
}

/*****************************************************************************
* Orion Main IRQ
****************************************************************************/
static void __init orion5x_init_main_irq(void)
{
orion_irq_init(0, (void __iomem *)MAIN_IRQ_MASK);
}

void __init orion5x_init_irq(void)
{
orion5x_init_main_irq();
orion5x_init_gpio_irq();
set_irq_chained_handler(IRQ_ORION5X_GPIO_0_7, gpio_irq_handler);
set_irq_chained_handler(IRQ_ORION5X_GPIO_8_15, gpio_irq_handler);
set_irq_chained_handler(IRQ_ORION5X_GPIO_16_23, gpio_irq_handler);
set_irq_chained_handler(IRQ_ORION5X_GPIO_24_31, gpio_irq_handler);
}
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