Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 313 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/irq.c b/arch/arm/mach-pxa/irq.c
new file mode 100644
index 00000000000..f3cac43124a
--- /dev/null
+++ b/arch/arm/mach-pxa/irq.c
@@ -0,0 +1,313 @@
+/*
+ *  linux/arch/arm/mach-pxa/irq.c
+ *
+ *  Generic PXA IRQ handling, GPIO IRQ demultiplexing, etc.
+ *
+ *  Author:	Nicolas Pitre
+ *  Created:	Jun 15, 2001
+ *  Copyright:	MontaVista Software Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+#include <asm/arch/pxa-regs.h>
+
+#include "generic.h"
+
+
+/*
+ * This is for peripheral IRQs internal to the PXA chip.
+ */
+
+static void pxa_mask_low_irq(unsigned int irq)
+{
+	ICMR &= ~(1 << (irq + PXA_IRQ_SKIP));
+}
+
+static void pxa_unmask_low_irq(unsigned int irq)
+{
+	ICMR |= (1 << (irq + PXA_IRQ_SKIP));
+}
+
+static struct irqchip pxa_internal_chip_low = {
+	.ack		= pxa_mask_low_irq,
+	.mask		= pxa_mask_low_irq,
+	.unmask		= pxa_unmask_low_irq,
+};
+
+#if PXA_INTERNAL_IRQS > 32
+
+/*
+ * This is for the second set of internal IRQs as found on the PXA27x.
+ */
+
+static void pxa_mask_high_irq(unsigned int irq)
+{
+	ICMR2 &= ~(1 << (irq - 32 + PXA_IRQ_SKIP));
+}
+
+static void pxa_unmask_high_irq(unsigned int irq)
+{
+	ICMR2 |= (1 << (irq - 32 + PXA_IRQ_SKIP));
+}
+
+static struct irqchip pxa_internal_chip_high = {
+	.ack		= pxa_mask_high_irq,
+	.mask		= pxa_mask_high_irq,
+	.unmask		= pxa_unmask_high_irq,
+};
+
+#endif
+
+/*
+ * PXA GPIO edge detection for IRQs:
+ * IRQs are generated on Falling-Edge, Rising-Edge, or both.
+ * Use this instead of directly setting GRER/GFER.
+ */
+
+static long GPIO_IRQ_rising_edge[4];
+static long GPIO_IRQ_falling_edge[4];
+static long GPIO_IRQ_mask[4];
+
+static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
+{
+	int gpio, idx;
+
+	gpio = IRQ_TO_GPIO(irq);
+	idx = gpio >> 5;
+
+	if (type == IRQT_PROBE) {
+	    /* Don't mess with enabled GPIOs using preconfigured edges or
+	       GPIOs set to alternate function during probe */
+		if ((GPIO_IRQ_rising_edge[idx] | GPIO_IRQ_falling_edge[idx]) &
+		    GPIO_bit(gpio))
+			return 0;
+		if (GAFR(gpio) & (0x3 << (((gpio) & 0xf)*2)))
+			return 0;
+		type = __IRQT_RISEDGE | __IRQT_FALEDGE;
+	}
+
+	/* printk(KERN_DEBUG "IRQ%d (GPIO%d): ", irq, gpio); */
+
+	pxa_gpio_mode(gpio | GPIO_IN);
+
+	if (type & __IRQT_RISEDGE) {
+		/* printk("rising "); */
+		__set_bit (gpio, GPIO_IRQ_rising_edge);
+	} else
+		__clear_bit (gpio, GPIO_IRQ_rising_edge);
+
+	if (type & __IRQT_FALEDGE) {
+		/* printk("falling "); */
+		__set_bit (gpio, GPIO_IRQ_falling_edge);
+	} else
+		__clear_bit (gpio, GPIO_IRQ_falling_edge);
+
+	/* printk("edges\n"); */
+
+	GRER(gpio) = GPIO_IRQ_rising_edge[idx] & GPIO_IRQ_mask[idx];
+	GFER(gpio) = GPIO_IRQ_falling_edge[idx] & GPIO_IRQ_mask[idx];
+	return 0;
+}
+
+/*
+ * GPIO IRQs must be acknowledged.  This is for GPIO 0 and 1.
+ */
+
+static void pxa_ack_low_gpio(unsigned int irq)
+{
+	GEDR0 = (1 << (irq - IRQ_GPIO0));
+}
+
+static struct irqchip pxa_low_gpio_chip = {
+	.ack		= pxa_ack_low_gpio,
+	.mask		= pxa_mask_low_irq,
+	.unmask		= pxa_unmask_low_irq,
+	.type		= pxa_gpio_irq_type,
+};
+
+/*
+ * Demux handler for GPIO>=2 edge detect interrupts
+ */
+
+static void pxa_gpio_demux_handler(unsigned int irq, struct irqdesc *desc,
+				   struct pt_regs *regs)
+{
+	unsigned int mask;
+	int loop;
+
+	do {
+		loop = 0;
+
+		mask = GEDR0 & ~3;
+		if (mask) {
+			GEDR0 = mask;
+			irq = IRQ_GPIO(2);
+			desc = irq_desc + irq;
+			mask >>= 2;
+			do {
+				if (mask & 1)
+					desc->handle(irq, desc, regs);
+				irq++;
+				desc++;
+				mask >>= 1;
+			} while (mask);
+			loop = 1;
+		}
+
+		mask = GEDR1;
+		if (mask) {
+			GEDR1 = mask;
+			irq = IRQ_GPIO(32);
+			desc = irq_desc + irq;
+			do {
+				if (mask & 1)
+					desc->handle(irq, desc, regs);
+				irq++;
+				desc++;
+				mask >>= 1;
+			} while (mask);
+			loop = 1;
+		}
+
+		mask = GEDR2;
+		if (mask) {
+			GEDR2 = mask;
+			irq = IRQ_GPIO(64);
+			desc = irq_desc + irq;
+			do {
+				if (mask & 1)
+					desc->handle(irq, desc, regs);
+				irq++;
+				desc++;
+				mask >>= 1;
+			} while (mask);
+			loop = 1;
+		}
+
+#if PXA_LAST_GPIO >= 96
+		mask = GEDR3;
+		if (mask) {
+			GEDR3 = mask;
+			irq = IRQ_GPIO(96);
+			desc = irq_desc + irq;
+			do {
+				if (mask & 1)
+					desc->handle(irq, desc, regs);
+				irq++;
+				desc++;
+				mask >>= 1;
+			} while (mask);
+			loop = 1;
+		}
+#endif
+	} while (loop);
+}
+
+static void pxa_ack_muxed_gpio(unsigned int irq)
+{
+	int gpio = irq - IRQ_GPIO(2) + 2;
+	GEDR(gpio) = GPIO_bit(gpio);
+}
+
+static void pxa_mask_muxed_gpio(unsigned int irq)
+{
+	int gpio = irq - IRQ_GPIO(2) + 2;
+	__clear_bit(gpio, GPIO_IRQ_mask);
+	GRER(gpio) &= ~GPIO_bit(gpio);
+	GFER(gpio) &= ~GPIO_bit(gpio);
+}
+
+static void pxa_unmask_muxed_gpio(unsigned int irq)
+{
+	int gpio = irq - IRQ_GPIO(2) + 2;
+	int idx = gpio >> 5;
+	__set_bit(gpio, GPIO_IRQ_mask);
+	GRER(gpio) = GPIO_IRQ_rising_edge[idx] & GPIO_IRQ_mask[idx];
+	GFER(gpio) = GPIO_IRQ_falling_edge[idx] & GPIO_IRQ_mask[idx];
+}
+
+static struct irqchip pxa_muxed_gpio_chip = {
+	.ack		= pxa_ack_muxed_gpio,
+	.mask		= pxa_mask_muxed_gpio,
+	.unmask		= pxa_unmask_muxed_gpio,
+	.type		= pxa_gpio_irq_type,
+};
+
+
+void __init pxa_init_irq(void)
+{
+	int irq;
+
+	/* disable all IRQs */
+	ICMR = 0;
+
+	/* all IRQs are IRQ, not FIQ */
+	ICLR = 0;
+
+	/* clear all GPIO edge detects */
+	GFER0 = 0;
+	GFER1 = 0;
+	GFER2 = 0;
+	GRER0 = 0;
+	GRER1 = 0;
+	GRER2 = 0;
+	GEDR0 = GEDR0;
+	GEDR1 = GEDR1;
+	GEDR2 = GEDR2;
+
+#ifdef CONFIG_PXA27x
+	/* And similarly for the extra regs on the PXA27x */
+	ICMR2 = 0;
+	ICLR2 = 0;
+	GFER3 = 0;
+	GRER3 = 0;
+	GEDR3 = GEDR3;
+#endif
+
+	/* only unmasked interrupts kick us out of idle */
+	ICCR = 1;
+
+	/* GPIO 0 and 1 must have their mask bit always set */
+	GPIO_IRQ_mask[0] = 3;
+
+	for (irq = PXA_IRQ(PXA_IRQ_SKIP); irq <= PXA_IRQ(31); irq++) {
+		set_irq_chip(irq, &pxa_internal_chip_low);
+		set_irq_handler(irq, do_level_IRQ);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+#if PXA_INTERNAL_IRQS > 32
+	for (irq = PXA_IRQ(32); irq < PXA_IRQ(PXA_INTERNAL_IRQS); irq++) {
+		set_irq_chip(irq, &pxa_internal_chip_high);
+		set_irq_handler(irq, do_level_IRQ);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+#endif
+
+	for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
+		set_irq_chip(irq, &pxa_low_gpio_chip);
+		set_irq_handler(irq, do_edge_IRQ);
+		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+	}
+
+	for (irq = IRQ_GPIO(2); irq <= IRQ_GPIO(PXA_LAST_GPIO); irq++) {
+		set_irq_chip(irq, &pxa_muxed_gpio_chip);
+		set_irq_handler(irq, do_edge_IRQ);
+		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+	}
+
+	/* Install handler for GPIO>=2 edge detect interrupts */
+	set_irq_chip(IRQ_GPIO_2_x, &pxa_internal_chip_low);
+	set_irq_chained_handler(IRQ_GPIO_2_x, pxa_gpio_demux_handler);
+}