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[ARM] 3374/1: ep93xx: gpio interrupt support
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Patch from Lennert Buytenhek

Add GPIO interrupt support for the first 16 GPIO lines (port A
and B.)

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Lennert Buytenhek authored and Russell King committed Mar 21, 2006
1 parent 36c64af commit bd20ff5
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Showing 3 changed files with 146 additions and 1 deletion.
133 changes: 133 additions & 0 deletions arch/arm/mach-ep93xx/core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -150,6 +150,26 @@ struct sys_timer ep93xx_timer = {
/*************************************************************************
* GPIO handling for EP93xx
*************************************************************************/
static unsigned char gpio_int_enable[2];
static unsigned char gpio_int_type1[2];
static unsigned char gpio_int_type2[2];

static void update_gpio_ab_int_params(int port)
{
if (port == 0) {
__raw_writeb(0, EP93XX_GPIO_A_INT_ENABLE);
__raw_writeb(gpio_int_type2[0], EP93XX_GPIO_A_INT_TYPE2);
__raw_writeb(gpio_int_type1[0], EP93XX_GPIO_A_INT_TYPE1);
__raw_writeb(gpio_int_enable[0], EP93XX_GPIO_A_INT_ENABLE);
} else if (port == 1) {
__raw_writeb(0, EP93XX_GPIO_B_INT_ENABLE);
__raw_writeb(gpio_int_type2[1], EP93XX_GPIO_B_INT_TYPE2);
__raw_writeb(gpio_int_type1[1], EP93XX_GPIO_B_INT_TYPE1);
__raw_writeb(gpio_int_enable[1], EP93XX_GPIO_B_INT_ENABLE);
}
}


static unsigned char data_register_offset[8] = {
0x00, 0x04, 0x08, 0x0c, 0x20, 0x30, 0x38, 0x40,
};
Expand All @@ -169,6 +189,11 @@ void gpio_line_config(int line, int direction)

local_irq_save(flags);
if (direction == GPIO_OUT) {
if (line >= 0 && line < 16) {
gpio_int_enable[line >> 3] &= ~(1 << (line & 7));
update_gpio_ab_int_params(line >> 3);
}

v = __raw_readb(data_direction_register);
v |= 1 << (line & 7);
__raw_writeb(v, data_direction_register);
Expand Down Expand Up @@ -217,10 +242,118 @@ EXPORT_SYMBOL(gpio_line_set);
/*************************************************************************
* EP93xx IRQ handling
*************************************************************************/
static void ep93xx_gpio_ab_irq_handler(unsigned int irq,
struct irqdesc *desc, struct pt_regs *regs)
{
unsigned char status;
int i;

status = __raw_readb(EP93XX_GPIO_A_INT_STATUS);
for (i = 0; i < 8; i++) {
if (status & (1 << i)) {
desc = irq_desc + IRQ_EP93XX_GPIO(0) + i;
desc_handle_irq(IRQ_EP93XX_GPIO(0) + i, desc, regs);
}
}

status = __raw_readb(EP93XX_GPIO_B_INT_STATUS);
for (i = 0; i < 8; i++) {
if (status & (1 << i)) {
desc = irq_desc + IRQ_EP93XX_GPIO(8) + i;
desc_handle_irq(IRQ_EP93XX_GPIO(8) + i, desc, regs);
}
}
}

static void ep93xx_gpio_ab_irq_mask_ack(unsigned int irq)
{
int line = irq - IRQ_EP93XX_GPIO(0);
int port = line >> 3;

gpio_int_enable[port] &= ~(1 << (line & 7));
update_gpio_ab_int_params(port);

if (line >> 3) {
__raw_writel(1 << (line & 7), EP93XX_GPIO_B_INT_ACK);
} else {
__raw_writel(1 << (line & 7), EP93XX_GPIO_A_INT_ACK);
}
}

static void ep93xx_gpio_ab_irq_mask(unsigned int irq)
{
int line = irq - IRQ_EP93XX_GPIO(0);
int port = line >> 3;

gpio_int_enable[port] &= ~(1 << (line & 7));
update_gpio_ab_int_params(port);
}

static void ep93xx_gpio_ab_irq_unmask(unsigned int irq)
{
int line = irq - IRQ_EP93XX_GPIO(0);
int port = line >> 3;

gpio_int_enable[port] |= 1 << (line & 7);
update_gpio_ab_int_params(port);
}


/*
* gpio_int_type1 controls whether the interrupt is level (0) or
* edge (1) triggered, while gpio_int_type2 controls whether it
* triggers on low/falling (0) or high/rising (1).
*/
static int ep93xx_gpio_ab_irq_type(unsigned int irq, unsigned int type)
{
int port;
int line;

line = irq - IRQ_EP93XX_GPIO(0);
gpio_line_config(line, GPIO_IN);

port = line >> 3;
line &= 7;

if (type & IRQT_RISING) {
gpio_int_type1[port] |= 1 << line;
gpio_int_type2[port] |= 1 << line;
} else if (type & IRQT_FALLING) {
gpio_int_type1[port] |= 1 << line;
gpio_int_type2[port] &= ~(1 << line);
} else if (type & IRQT_HIGH) {
gpio_int_type1[port] &= ~(1 << line);
gpio_int_type2[port] |= 1 << line;
} else if (type & IRQT_LOW) {
gpio_int_type1[port] &= ~(1 << line);
gpio_int_type2[port] &= ~(1 << line);
}
update_gpio_ab_int_params(port);

return 0;
}

static struct irqchip ep93xx_gpio_ab_irq_chip = {
.ack = ep93xx_gpio_ab_irq_mask_ack,
.mask = ep93xx_gpio_ab_irq_mask,
.unmask = ep93xx_gpio_ab_irq_unmask,
.set_type = ep93xx_gpio_ab_irq_type,
};


void __init ep93xx_init_irq(void)
{
int irq;

vic_init((void *)EP93XX_VIC1_BASE, 0, EP93XX_VIC1_VALID_IRQ_MASK);
vic_init((void *)EP93XX_VIC2_BASE, 32, EP93XX_VIC2_VALID_IRQ_MASK);

for (irq = IRQ_EP93XX_GPIO(0) ; irq <= IRQ_EP93XX_GPIO(15); irq++) {
set_irq_chip(irq, &ep93xx_gpio_ab_irq_chip);
set_irq_handler(irq, do_level_IRQ);
set_irq_flags(irq, IRQF_VALID);
}
set_irq_chained_handler(IRQ_EP93XX_GPIO_AB, ep93xx_gpio_ab_irq_handler);
}


Expand Down
10 changes: 10 additions & 0 deletions include/asm-arm/arch-ep93xx/ep93xx-regs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,16 @@

#define EP93XX_GPIO_BASE (EP93XX_APB_VIRT_BASE + 0x00040000)
#define EP93XX_GPIO_REG(x) (EP93XX_GPIO_BASE + (x))
#define EP93XX_GPIO_A_INT_TYPE1 EP93XX_GPIO_REG(0x90)
#define EP93XX_GPIO_A_INT_TYPE2 EP93XX_GPIO_REG(0x94)
#define EP93XX_GPIO_A_INT_ACK EP93XX_GPIO_REG(0x98)
#define EP93XX_GPIO_A_INT_ENABLE EP93XX_GPIO_REG(0x9c)
#define EP93XX_GPIO_A_INT_STATUS EP93XX_GPIO_REG(0xa0)
#define EP93XX_GPIO_B_INT_TYPE1 EP93XX_GPIO_REG(0xac)
#define EP93XX_GPIO_B_INT_TYPE2 EP93XX_GPIO_REG(0xb0)
#define EP93XX_GPIO_B_INT_ACK EP93XX_GPIO_REG(0xb4)
#define EP93XX_GPIO_B_INT_ENABLE EP93XX_GPIO_REG(0xb8)
#define EP93XX_GPIO_B_INT_STATUS EP93XX_GPIO_REG(0xbc)

#define EP93XX_AAC_BASE (EP93XX_APB_VIRT_BASE + 0x00080000)

Expand Down
4 changes: 3 additions & 1 deletion include/asm-arm/arch-ep93xx/irqs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,9 @@
#define IRQ_EP93XX_SAI 60
#define EP93XX_VIC2_VALID_IRQ_MASK 0x1fffffff

#define NR_EP93XX_IRQS 64
#define IRQ_EP93XX_GPIO(x) (64 + (x))

#define NR_EP93XX_IRQS IRQ_EP93XX_GPIO(16)

#define EP93XX_BOARD_IRQ(x) (NR_EP93XX_IRQS + (x))
#define EP93XX_BOARD_IRQS 32
Expand Down

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