e033108bf7
Patch from Guennadi Liakhovetski Currently probe_irq_on() on PXA will silently reconfigure all output GPIOs, that are not configured as alternate functions, for input. Avoid that. Upon CPU reset all GPIOs are configured as inputs, so, if a GPIO is configured as output, it has been done so intentionally. Signed-off-by: G. Liakhovetski <gl@dsa-ac.de> Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
314 lines
6.5 KiB
C
314 lines
6.5 KiB
C
/*
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* linux/arch/arm/mach-pxa/irq.c
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*
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* Generic PXA IRQ handling, GPIO IRQ demultiplexing, etc.
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*
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* Author: Nicolas Pitre
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* Created: Jun 15, 2001
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* Copyright: MontaVista Software Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/ptrace.h>
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#include <asm/hardware.h>
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#include <asm/irq.h>
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#include <asm/mach/irq.h>
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#include <asm/arch/pxa-regs.h>
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#include "generic.h"
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/*
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* This is for peripheral IRQs internal to the PXA chip.
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*/
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static void pxa_mask_low_irq(unsigned int irq)
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{
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ICMR &= ~(1 << (irq + PXA_IRQ_SKIP));
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}
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static void pxa_unmask_low_irq(unsigned int irq)
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{
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ICMR |= (1 << (irq + PXA_IRQ_SKIP));
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}
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static struct irqchip pxa_internal_chip_low = {
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.ack = pxa_mask_low_irq,
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.mask = pxa_mask_low_irq,
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.unmask = pxa_unmask_low_irq,
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};
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#if PXA_INTERNAL_IRQS > 32
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/*
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* This is for the second set of internal IRQs as found on the PXA27x.
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*/
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static void pxa_mask_high_irq(unsigned int irq)
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{
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ICMR2 &= ~(1 << (irq - 32 + PXA_IRQ_SKIP));
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}
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static void pxa_unmask_high_irq(unsigned int irq)
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{
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ICMR2 |= (1 << (irq - 32 + PXA_IRQ_SKIP));
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}
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static struct irqchip pxa_internal_chip_high = {
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.ack = pxa_mask_high_irq,
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.mask = pxa_mask_high_irq,
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.unmask = pxa_unmask_high_irq,
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};
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#endif
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/*
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* PXA GPIO edge detection for IRQs:
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* IRQs are generated on Falling-Edge, Rising-Edge, or both.
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* Use this instead of directly setting GRER/GFER.
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*/
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static long GPIO_IRQ_rising_edge[4];
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static long GPIO_IRQ_falling_edge[4];
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static long GPIO_IRQ_mask[4];
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static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
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{
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int gpio, idx;
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gpio = IRQ_TO_GPIO(irq);
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idx = gpio >> 5;
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if (type == IRQT_PROBE) {
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/* Don't mess with enabled GPIOs using preconfigured edges or
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GPIOs set to alternate function or to output during probe */
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if ((GPIO_IRQ_rising_edge[idx] | GPIO_IRQ_falling_edge[idx] | GPDR(gpio)) &
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GPIO_bit(gpio))
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return 0;
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if (GAFR(gpio) & (0x3 << (((gpio) & 0xf)*2)))
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return 0;
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type = __IRQT_RISEDGE | __IRQT_FALEDGE;
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}
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/* printk(KERN_DEBUG "IRQ%d (GPIO%d): ", irq, gpio); */
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pxa_gpio_mode(gpio | GPIO_IN);
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if (type & __IRQT_RISEDGE) {
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/* printk("rising "); */
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__set_bit (gpio, GPIO_IRQ_rising_edge);
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} else
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__clear_bit (gpio, GPIO_IRQ_rising_edge);
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if (type & __IRQT_FALEDGE) {
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/* printk("falling "); */
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__set_bit (gpio, GPIO_IRQ_falling_edge);
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} else
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__clear_bit (gpio, GPIO_IRQ_falling_edge);
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/* printk("edges\n"); */
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GRER(gpio) = GPIO_IRQ_rising_edge[idx] & GPIO_IRQ_mask[idx];
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GFER(gpio) = GPIO_IRQ_falling_edge[idx] & GPIO_IRQ_mask[idx];
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return 0;
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}
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/*
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* GPIO IRQs must be acknowledged. This is for GPIO 0 and 1.
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*/
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static void pxa_ack_low_gpio(unsigned int irq)
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{
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GEDR0 = (1 << (irq - IRQ_GPIO0));
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}
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static struct irqchip pxa_low_gpio_chip = {
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.ack = pxa_ack_low_gpio,
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.mask = pxa_mask_low_irq,
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.unmask = pxa_unmask_low_irq,
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.set_type = pxa_gpio_irq_type,
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};
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/*
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* Demux handler for GPIO>=2 edge detect interrupts
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*/
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static void pxa_gpio_demux_handler(unsigned int irq, struct irqdesc *desc,
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struct pt_regs *regs)
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{
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unsigned int mask;
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int loop;
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do {
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loop = 0;
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mask = GEDR0 & ~3;
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if (mask) {
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GEDR0 = mask;
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irq = IRQ_GPIO(2);
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desc = irq_desc + irq;
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mask >>= 2;
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do {
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if (mask & 1)
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desc_handle_irq(irq, desc, regs);
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irq++;
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desc++;
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mask >>= 1;
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} while (mask);
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loop = 1;
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}
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mask = GEDR1;
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if (mask) {
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GEDR1 = mask;
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irq = IRQ_GPIO(32);
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desc = irq_desc + irq;
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do {
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if (mask & 1)
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desc_handle_irq(irq, desc, regs);
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irq++;
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desc++;
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mask >>= 1;
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} while (mask);
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loop = 1;
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}
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mask = GEDR2;
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if (mask) {
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GEDR2 = mask;
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irq = IRQ_GPIO(64);
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desc = irq_desc + irq;
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do {
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if (mask & 1)
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desc_handle_irq(irq, desc, regs);
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irq++;
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desc++;
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mask >>= 1;
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} while (mask);
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loop = 1;
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}
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#if PXA_LAST_GPIO >= 96
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mask = GEDR3;
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if (mask) {
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GEDR3 = mask;
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irq = IRQ_GPIO(96);
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desc = irq_desc + irq;
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do {
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if (mask & 1)
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desc_handle_irq(irq, desc, regs);
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irq++;
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desc++;
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mask >>= 1;
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} while (mask);
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loop = 1;
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}
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#endif
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} while (loop);
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}
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static void pxa_ack_muxed_gpio(unsigned int irq)
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{
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int gpio = irq - IRQ_GPIO(2) + 2;
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GEDR(gpio) = GPIO_bit(gpio);
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}
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static void pxa_mask_muxed_gpio(unsigned int irq)
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{
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int gpio = irq - IRQ_GPIO(2) + 2;
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__clear_bit(gpio, GPIO_IRQ_mask);
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GRER(gpio) &= ~GPIO_bit(gpio);
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GFER(gpio) &= ~GPIO_bit(gpio);
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}
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static void pxa_unmask_muxed_gpio(unsigned int irq)
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{
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int gpio = irq - IRQ_GPIO(2) + 2;
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int idx = gpio >> 5;
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__set_bit(gpio, GPIO_IRQ_mask);
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GRER(gpio) = GPIO_IRQ_rising_edge[idx] & GPIO_IRQ_mask[idx];
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GFER(gpio) = GPIO_IRQ_falling_edge[idx] & GPIO_IRQ_mask[idx];
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}
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static struct irqchip pxa_muxed_gpio_chip = {
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.ack = pxa_ack_muxed_gpio,
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.mask = pxa_mask_muxed_gpio,
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.unmask = pxa_unmask_muxed_gpio,
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.set_type = pxa_gpio_irq_type,
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};
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void __init pxa_init_irq(void)
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{
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int irq;
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/* disable all IRQs */
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ICMR = 0;
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/* all IRQs are IRQ, not FIQ */
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ICLR = 0;
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/* clear all GPIO edge detects */
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GFER0 = 0;
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GFER1 = 0;
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GFER2 = 0;
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GRER0 = 0;
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GRER1 = 0;
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GRER2 = 0;
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GEDR0 = GEDR0;
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GEDR1 = GEDR1;
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GEDR2 = GEDR2;
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#ifdef CONFIG_PXA27x
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/* And similarly for the extra regs on the PXA27x */
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ICMR2 = 0;
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ICLR2 = 0;
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GFER3 = 0;
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GRER3 = 0;
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GEDR3 = GEDR3;
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#endif
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/* only unmasked interrupts kick us out of idle */
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ICCR = 1;
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/* GPIO 0 and 1 must have their mask bit always set */
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GPIO_IRQ_mask[0] = 3;
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for (irq = PXA_IRQ(PXA_IRQ_SKIP); irq <= PXA_IRQ(31); irq++) {
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set_irq_chip(irq, &pxa_internal_chip_low);
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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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}
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#if PXA_INTERNAL_IRQS > 32
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for (irq = PXA_IRQ(32); irq < PXA_IRQ(PXA_INTERNAL_IRQS); irq++) {
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set_irq_chip(irq, &pxa_internal_chip_high);
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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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}
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#endif
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for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
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set_irq_chip(irq, &pxa_low_gpio_chip);
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set_irq_handler(irq, do_edge_IRQ);
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set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
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}
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for (irq = IRQ_GPIO(2); irq <= IRQ_GPIO(PXA_LAST_GPIO); irq++) {
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set_irq_chip(irq, &pxa_muxed_gpio_chip);
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set_irq_handler(irq, do_edge_IRQ);
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set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
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}
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/* Install handler for GPIO>=2 edge detect interrupts */
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set_irq_chip(IRQ_GPIO_2_x, &pxa_internal_chip_low);
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set_irq_chained_handler(IRQ_GPIO_2_x, pxa_gpio_demux_handler);
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}
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