[PATCH] ARM: 2744/1: ixp2000 gpio irq support
Patch from Lennert Buytenhek This patch cleans up the ixp2000 gpio irq code and implements the set_irq_type method for gpio irqs so that users can select for which events (falling edge/rising edge/level low/level high) on the gpio pin they want the corresponding gpio irq to be triggered. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Deepak Saxena Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Lennert Buytenhek
Russell King
Родитель
c6b56949de
Коммит
c4982887ca
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@ -40,6 +40,8 @@
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#include <asm/mach/time.h>
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#include <asm/mach/irq.h>
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#include <asm/arch/gpio.h>
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static DEFINE_SPINLOCK(ixp2000_slowport_lock);
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static unsigned long ixp2000_slowport_irq_flags;
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@ -179,7 +181,7 @@ static int ixp2000_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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/* clear timer 1 */
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ixp2000_reg_write(IXP2000_T1_CLR, 1);
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while ((next_jiffy_time - *missing_jiffy_timer_csr) > ticks_per_jiffy) {
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timer_tick(regs);
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next_jiffy_time -= ticks_per_jiffy;
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@ -238,35 +240,40 @@ void __init ixp2000_init_time(unsigned long tick_rate)
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/*************************************************************************
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* GPIO helpers
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*************************************************************************/
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static unsigned long GPIO_IRQ_rising_edge;
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static unsigned long GPIO_IRQ_falling_edge;
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static unsigned long GPIO_IRQ_rising_edge;
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static unsigned long GPIO_IRQ_level_low;
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static unsigned long GPIO_IRQ_level_high;
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void gpio_line_config(int line, int style)
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static void update_gpio_int_csrs(void)
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{
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ixp2000_reg_write(IXP2000_GPIO_FEDR, GPIO_IRQ_falling_edge);
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ixp2000_reg_write(IXP2000_GPIO_REDR, GPIO_IRQ_rising_edge);
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ixp2000_reg_write(IXP2000_GPIO_LSLR, GPIO_IRQ_level_low);
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ixp2000_reg_write(IXP2000_GPIO_LSHR, GPIO_IRQ_level_high);
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}
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void gpio_line_config(int line, int direction)
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{
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unsigned long flags;
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local_irq_save(flags);
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if (direction == GPIO_OUT) {
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irq_desc[line + IRQ_IXP2000_GPIO0].valid = 0;
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if(style == GPIO_OUT) {
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/* if it's an output, it ain't an interrupt anymore */
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ixp2000_reg_write(IXP2000_GPIO_PDSR, (1 << line));
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GPIO_IRQ_falling_edge &= ~(1 << line);
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GPIO_IRQ_rising_edge &= ~(1 << line);
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GPIO_IRQ_level_low &= ~(1 << line);
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GPIO_IRQ_level_high &= ~(1 << line);
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ixp2000_reg_write(IXP2000_GPIO_FEDR, GPIO_IRQ_falling_edge);
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ixp2000_reg_write(IXP2000_GPIO_REDR, GPIO_IRQ_rising_edge);
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ixp2000_reg_write(IXP2000_GPIO_LSHR, GPIO_IRQ_level_high);
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ixp2000_reg_write(IXP2000_GPIO_LSLR, GPIO_IRQ_level_low);
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irq_desc[line+IRQ_IXP2000_GPIO0].valid = 0;
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} else if(style == GPIO_IN) {
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ixp2000_reg_write(IXP2000_GPIO_PDCR, (1 << line));
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update_gpio_int_csrs();
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ixp2000_reg_write(IXP2000_GPIO_PDSR, 1 << line);
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} else if (direction == GPIO_IN) {
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ixp2000_reg_write(IXP2000_GPIO_PDCR, 1 << line);
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}
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local_irq_restore(flags);
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}
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}
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/*************************************************************************
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@ -285,9 +292,50 @@ static void ixp2000_GPIO_irq_handler(unsigned int irq, struct irqdesc *desc, str
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}
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}
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static int ixp2000_GPIO_irq_type(unsigned int irq, unsigned int type)
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{
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int line = irq - IRQ_IXP2000_GPIO0;
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/*
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* First, configure this GPIO line as an input.
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*/
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ixp2000_reg_write(IXP2000_GPIO_PDCR, 1 << line);
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/*
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* Then, set the proper trigger type.
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*/
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if (type & IRQT_FALLING)
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GPIO_IRQ_falling_edge |= 1 << line;
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else
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GPIO_IRQ_falling_edge &= ~(1 << line);
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if (type & IRQT_RISING)
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GPIO_IRQ_rising_edge |= 1 << line;
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else
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GPIO_IRQ_rising_edge &= ~(1 << line);
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if (type & IRQT_LOW)
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GPIO_IRQ_level_low |= 1 << line;
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else
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GPIO_IRQ_level_low &= ~(1 << line);
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if (type & IRQT_HIGH)
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GPIO_IRQ_level_high |= 1 << line;
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else
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GPIO_IRQ_level_high &= ~(1 << line);
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update_gpio_int_csrs();
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/*
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* Finally, mark the corresponding IRQ as valid.
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*/
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irq_desc[irq].valid = 1;
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return 0;
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}
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static void ixp2000_GPIO_irq_mask_ack(unsigned int irq)
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{
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ixp2000_reg_write(IXP2000_GPIO_INCR, (1 << (irq - IRQ_IXP2000_GPIO0)));
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ixp2000_reg_write(IXP2000_GPIO_EDSR, (1 << (irq - IRQ_IXP2000_GPIO0)));
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ixp2000_reg_write(IXP2000_GPIO_LDSR, (1 << (irq - IRQ_IXP2000_GPIO0)));
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ixp2000_reg_write(IXP2000_GPIO_INST, (1 << (irq - IRQ_IXP2000_GPIO0)));
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}
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@ -302,6 +350,7 @@ static void ixp2000_GPIO_irq_unmask(unsigned int irq)
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}
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static struct irqchip ixp2000_GPIO_irq_chip = {
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.type = ixp2000_GPIO_irq_type,
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.ack = ixp2000_GPIO_irq_mask_ack,
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.mask = ixp2000_GPIO_irq_mask,
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.unmask = ixp2000_GPIO_irq_unmask
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@ -338,7 +387,7 @@ static void ixp2000_irq_mask(unsigned int irq)
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static void ixp2000_irq_unmask(unsigned int irq)
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{
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ixp2000_reg_write(IXP2000_IRQ_ENABLE_SET, (1 << irq));
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ixp2000_reg_write(IXP2000_IRQ_ENABLE_SET, (1 << irq));
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}
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static struct irqchip ixp2000_irq_chip = {
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@ -375,16 +424,16 @@ void __init ixp2000_init_irq(void)
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* our mask/unmask code much simpler.
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*/
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for (irq = IRQ_IXP2000_SOFT_INT; irq <= IRQ_IXP2000_THDB3; irq++) {
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if((1 << irq) & IXP2000_VALID_IRQ_MASK) {
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if ((1 << irq) & IXP2000_VALID_IRQ_MASK) {
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set_irq_chip(irq, &ixp2000_irq_chip);
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set_irq_handler(irq, do_level_IRQ);
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set_irq_flags(irq, IRQF_VALID);
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} else set_irq_flags(irq, 0);
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}
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/*
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* GPIO IRQs are invalid until someone sets the interrupt mode
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* by calling gpio_line_set();
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* by calling set_irq_type().
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*/
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for (irq = IRQ_IXP2000_GPIO0; irq <= IRQ_IXP2000_GPIO7; irq++) {
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set_irq_chip(irq, &ixp2000_GPIO_irq_chip);
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@ -33,7 +33,8 @@
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#include <asm/hardware.h> /* Pick up IXP42000-specific bits */
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#include <asm/hardware.h> /* Pick up IXP2000-specific bits */
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#include <asm/arch/gpio.h>
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static inline int ixp2000_scl_pin(void *data)
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{
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@ -1,5 +1,5 @@
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/*
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* include/asm-arm/arch-ixp2000/ixp2000-gpio.h
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* include/asm-arm/arch-ixp2000/gpio.h
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*
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* Copyright (C) 2002 Intel Corporation.
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*
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@ -16,26 +16,18 @@
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* Use this instead of directly setting the GPIO registers.
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* GPIOs may also be used as GPIOs (e.g. for emulating i2c/smb)
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*/
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#ifndef _ASM_ARCH_IXP2000_GPIO_H_
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#define _ASM_ARCH_IXP2000_GPIO_H_
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#ifndef __ASM_ARCH_GPIO_H
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#define __ASM_ARCH_GPIO_H
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#ifndef __ASSEMBLY__
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#define GPIO_OUT 0x0
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#define GPIO_IN 0x80
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#define GPIO_IN 0
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#define GPIO_OUT 1
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#define IXP2000_GPIO_LOW 0
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#define IXP2000_GPIO_HIGH 1
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#define GPIO_NO_EDGES 0
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#define GPIO_FALLING_EDGE 1
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#define GPIO_RISING_EDGE 2
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#define GPIO_BOTH_EDGES 3
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#define GPIO_LEVEL_LOW 4
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#define GPIO_LEVEL_HIGH 8
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extern void set_GPIO_IRQ_edge(int gpio_nr, int edge);
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extern void set_GPIO_IRQ_level(int gpio_nr, int level);
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extern void gpio_line_config(int line, int style);
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extern void gpio_line_config(int line, int direction);
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static inline int gpio_line_get(int line)
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{
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@ -45,11 +37,12 @@ static inline int gpio_line_get(int line)
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static inline void gpio_line_set(int line, int value)
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{
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if (value == IXP2000_GPIO_HIGH) {
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ixp_reg_write(IXP2000_GPIO_POSR, BIT(line));
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} else if (value == IXP2000_GPIO_LOW)
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ixp_reg_write(IXP2000_GPIO_POCR, BIT(line));
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ixp2000_reg_write(IXP2000_GPIO_POSR, 1 << line);
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} else if (value == IXP2000_GPIO_LOW) {
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ixp2000_reg_write(IXP2000_GPIO_POCR, 1 << line);
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}
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* ASM_ARCH_IXP2000_GPIO_H_ */
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#endif /* ASM_ARCH_IXP2000_GPIO_H_ */
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@ -138,30 +138,10 @@ struct ixp2000_flash_data {
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unsigned long (*bank_setup)(unsigned long);
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};
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/*
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* GPIO helper functions
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*/
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#define GPIO_IN 0
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#define GPIO_OUT 1
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extern void gpio_line_config(int line, int style);
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static inline int gpio_line_get(int line)
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{
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return (((*IXP2000_GPIO_PLR) >> line) & 1);
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}
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static inline void gpio_line_set(int line, int value)
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{
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if (value)
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ixp2000_reg_write(IXP2000_GPIO_POSR, (1 << line));
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else
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ixp2000_reg_write(IXP2000_GPIO_POCR, (1 << line));
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}
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struct ixp2000_i2c_pins {
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unsigned long sda_pin;
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unsigned long scl_pin;
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};
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#endif /* !__ASSEMBLY__ */
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