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, 455 insertions, 0 deletions

diff --git a/arch/mips/vr41xx/common/giu.c b/arch/mips/vr41xx/common/giu.c
new file mode 100644
index 0000000..9c6b21a
--- /dev/null
+++ b/arch/mips/vr41xx/common/giu.c
@@ -0,0 +1,455 @@
+/*
+ *  giu.c, General-purpose I/O Unit Interrupt routines for NEC VR4100 series.
+ *
+ *  Copyright (C) 2002 MontaVista Software Inc.
+ *    Author: Yoichi Yuasa <yyuasa@mvista.com or source@mvista.com>
+ *  Copyright (C) 2003-2004  Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
+ *  Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+/*
+ * Changes:
+ *  MontaVista Software Inc. <yyuasa@mvista.com> or <source@mvista.com>
+ *  - New creation, NEC VR4111, VR4121, VR4122 and VR4131 are supported.
+ *
+ *  Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
+ *  - Added support for NEC VR4133.
+ *  - Removed board_irq_init.
+ */
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/smp.h>
+#include <linux/types.h>
+
+#include <asm/cpu.h>
+#include <asm/io.h>
+#include <asm/vr41xx/vr41xx.h>
+
+#define GIUIOSELL_TYPE1	KSEG1ADDR(0x0b000100)
+#define GIUIOSELL_TYPE2	KSEG1ADDR(0x0f000140)
+
+#define GIUIOSELL	0x00
+#define GIUIOSELH	0x02
+#define GIUINTSTATL	0x08
+#define GIUINTSTATH	0x0a
+#define GIUINTENL	0x0c
+#define GIUINTENH	0x0e
+#define GIUINTTYPL	0x10
+#define GIUINTTYPH	0x12
+#define GIUINTALSELL	0x14
+#define GIUINTALSELH	0x16
+#define GIUINTHTSELL	0x18
+#define GIUINTHTSELH	0x1a
+#define GIUFEDGEINHL	0x20
+#define GIUFEDGEINHH	0x22
+#define GIUREDGEINHL	0x24
+#define GIUREDGEINHH	0x26
+
+static uint32_t giu_base;
+
+static struct irqaction giu_cascade = {
+	.handler	= no_action,
+	.mask		= CPU_MASK_NONE,
+	.name		= "cascade",
+};
+
+#define read_giuint(offset)		readw(giu_base + (offset))
+#define write_giuint(val, offset)	writew((val), giu_base + (offset))
+
+#define GIUINT_HIGH_OFFSET	16
+
+static inline uint16_t set_giuint(uint8_t offset, uint16_t set)
+{
+	uint16_t res;
+
+	res = read_giuint(offset);
+	res |= set;
+	write_giuint(res, offset);
+
+	return res;
+}
+
+static inline uint16_t clear_giuint(uint8_t offset, uint16_t clear)
+{
+	uint16_t res;
+
+	res = read_giuint(offset);
+	res &= ~clear;
+	write_giuint(res, offset);
+
+	return res;
+}
+
+static unsigned int startup_giuint_low_irq(unsigned int irq)
+{
+	unsigned int pin;
+
+	pin = GIU_IRQ_TO_PIN(irq);
+	write_giuint((uint16_t)1 << pin, GIUINTSTATL);
+	set_giuint(GIUINTENL, (uint16_t)1 << pin);
+
+	return 0;
+}
+
+static void shutdown_giuint_low_irq(unsigned int irq)
+{
+	clear_giuint(GIUINTENL, (uint16_t)1 << GIU_IRQ_TO_PIN(irq));
+}
+
+static void enable_giuint_low_irq(unsigned int irq)
+{
+	set_giuint(GIUINTENL, (uint16_t)1 << GIU_IRQ_TO_PIN(irq));
+}
+
+#define disable_giuint_low_irq	shutdown_giuint_low_irq
+
+static void ack_giuint_low_irq(unsigned int irq)
+{
+	unsigned int pin;
+
+	pin = GIU_IRQ_TO_PIN(irq);
+	clear_giuint(GIUINTENL, (uint16_t)1 << pin);
+	write_giuint((uint16_t)1 << pin, GIUINTSTATL);
+}
+
+static void end_giuint_low_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+		set_giuint(GIUINTENL, (uint16_t)1 << GIU_IRQ_TO_PIN(irq));
+}
+
+static struct hw_interrupt_type giuint_low_irq_type = {
+	.typename	= "GIUINTL",
+	.startup	= startup_giuint_low_irq,
+	.shutdown	= shutdown_giuint_low_irq,
+	.enable		= enable_giuint_low_irq,
+	.disable	= disable_giuint_low_irq,
+	.ack		= ack_giuint_low_irq,
+	.end		= end_giuint_low_irq,
+};
+
+static unsigned int startup_giuint_high_irq(unsigned int irq)
+{
+	unsigned int pin;
+
+	pin = GIU_IRQ_TO_PIN(irq - GIUINT_HIGH_OFFSET);
+	write_giuint((uint16_t)1 << pin, GIUINTSTATH);
+	set_giuint(GIUINTENH, (uint16_t)1 << pin);
+
+	return 0;
+}
+
+static void shutdown_giuint_high_irq(unsigned int irq)
+{
+	clear_giuint(GIUINTENH, (uint16_t)1 << GIU_IRQ_TO_PIN(irq - GIUINT_HIGH_OFFSET));
+}
+
+static void enable_giuint_high_irq(unsigned int irq)
+{
+	set_giuint(GIUINTENH, (uint16_t)1 << GIU_IRQ_TO_PIN(irq - GIUINT_HIGH_OFFSET));
+}
+
+#define disable_giuint_high_irq	shutdown_giuint_high_irq
+
+static void ack_giuint_high_irq(unsigned int irq)
+{
+	unsigned int pin;
+
+	pin = GIU_IRQ_TO_PIN(irq - GIUINT_HIGH_OFFSET);
+	clear_giuint(GIUINTENH, (uint16_t)1 << pin);
+	write_giuint((uint16_t)1 << pin, GIUINTSTATH);
+}
+
+static void end_giuint_high_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+		set_giuint(GIUINTENH, (uint16_t)1 << GIU_IRQ_TO_PIN(irq - GIUINT_HIGH_OFFSET));
+}
+
+static struct hw_interrupt_type giuint_high_irq_type = {
+	.typename	= "GIUINTH",
+	.startup	= startup_giuint_high_irq,
+	.shutdown	= shutdown_giuint_high_irq,
+	.enable		= enable_giuint_high_irq,
+	.disable	= disable_giuint_high_irq,
+	.ack		= ack_giuint_high_irq,
+	.end		= end_giuint_high_irq,
+};
+
+void __init init_vr41xx_giuint_irq(void)
+{
+	int i;
+
+	for (i = GIU_IRQ_BASE; i <= GIU_IRQ_LAST; i++) {
+		if (i < (GIU_IRQ_BASE + GIUINT_HIGH_OFFSET))
+			irq_desc[i].handler = &giuint_low_irq_type;
+		else
+			irq_desc[i].handler = &giuint_high_irq_type;
+	}
+
+	setup_irq(GIUINT_CASCADE_IRQ, &giu_cascade);
+}
+
+void vr41xx_set_irq_trigger(int pin, int trigger, int hold)
+{
+	uint16_t mask;
+
+	if (pin < GIUINT_HIGH_OFFSET) {
+		mask = (uint16_t)1 << pin;
+		if (trigger != TRIGGER_LEVEL) {
+        		set_giuint(GIUINTTYPL, mask);
+			if (hold == SIGNAL_HOLD)
+				set_giuint(GIUINTHTSELL, mask);
+			else
+				clear_giuint(GIUINTHTSELL, mask);
+			if (current_cpu_data.cputype == CPU_VR4133) {
+				switch (trigger) {
+				case TRIGGER_EDGE_FALLING:
+					set_giuint(GIUFEDGEINHL, mask);
+					clear_giuint(GIUREDGEINHL, mask);
+					break;
+				case TRIGGER_EDGE_RISING:
+					clear_giuint(GIUFEDGEINHL, mask);
+					set_giuint(GIUREDGEINHL, mask);
+					break;
+				default:
+					set_giuint(GIUFEDGEINHL, mask);
+					set_giuint(GIUREDGEINHL, mask);
+					break;
+				}
+			}
+		} else {
+			clear_giuint(GIUINTTYPL, mask);
+			clear_giuint(GIUINTHTSELL, mask);
+		}
+		write_giuint(mask, GIUINTSTATL);
+	} else {
+		mask = (uint16_t)1 << (pin - GIUINT_HIGH_OFFSET);
+		if (trigger != TRIGGER_LEVEL) {
+			set_giuint(GIUINTTYPH, mask);
+			if (hold == SIGNAL_HOLD)
+				set_giuint(GIUINTHTSELH, mask);
+			else
+				clear_giuint(GIUINTHTSELH, mask);
+			if (current_cpu_data.cputype == CPU_VR4133) {
+				switch (trigger) {
+				case TRIGGER_EDGE_FALLING:
+					set_giuint(GIUFEDGEINHH, mask);
+					clear_giuint(GIUREDGEINHH, mask);
+					break;
+				case TRIGGER_EDGE_RISING:
+					clear_giuint(GIUFEDGEINHH, mask);
+					set_giuint(GIUREDGEINHH, mask);
+					break;
+				default:
+					set_giuint(GIUFEDGEINHH, mask);
+					set_giuint(GIUREDGEINHH, mask);
+					break;
+				}
+			}
+		} else {
+			clear_giuint(GIUINTTYPH, mask);
+			clear_giuint(GIUINTHTSELH, mask);
+		}
+		write_giuint(mask, GIUINTSTATH);
+	}
+}
+
+EXPORT_SYMBOL(vr41xx_set_irq_trigger);
+
+void vr41xx_set_irq_level(int pin, int level)
+{
+	uint16_t mask;
+
+	if (pin < GIUINT_HIGH_OFFSET) {
+		mask = (uint16_t)1 << pin;
+		if (level == LEVEL_HIGH)
+			set_giuint(GIUINTALSELL, mask);
+		else
+			clear_giuint(GIUINTALSELL, mask);
+		write_giuint(mask, GIUINTSTATL);
+	} else {
+		mask = (uint16_t)1 << (pin - GIUINT_HIGH_OFFSET);
+		if (level == LEVEL_HIGH)
+			set_giuint(GIUINTALSELH, mask);
+		else
+			clear_giuint(GIUINTALSELH, mask);
+		write_giuint(mask, GIUINTSTATH);
+	}
+}
+
+EXPORT_SYMBOL(vr41xx_set_irq_level);
+
+#define GIUINT_NR_IRQS		32
+
+enum {
+	GIUINT_NO_CASCADE,
+	GIUINT_CASCADE
+};
+
+struct vr41xx_giuint_cascade {
+	unsigned int flag;
+	int (*get_irq_number)(int irq);
+};
+
+static struct vr41xx_giuint_cascade giuint_cascade[GIUINT_NR_IRQS];
+
+static int no_irq_number(int irq)
+{
+	return -EINVAL;
+}
+
+int vr41xx_cascade_irq(unsigned int irq, int (*get_irq_number)(int irq))
+{
+	unsigned int pin;
+	int retval;
+
+	if (irq < GIU_IRQ(0) || irq > GIU_IRQ(31))
+		return -EINVAL;
+
+	if(!get_irq_number)
+		return -EINVAL;
+
+	pin = GIU_IRQ_TO_PIN(irq);
+	giuint_cascade[pin].flag = GIUINT_CASCADE;
+	giuint_cascade[pin].get_irq_number = get_irq_number;
+
+	retval = setup_irq(irq, &giu_cascade);
+	if (retval != 0) {
+		giuint_cascade[pin].flag = GIUINT_NO_CASCADE;
+		giuint_cascade[pin].get_irq_number = no_irq_number;
+	}
+
+	return retval;
+}
+
+EXPORT_SYMBOL(vr41xx_cascade_irq);
+
+static inline int get_irq_pin_number(void)
+{
+	uint16_t pendl, pendh, maskl, maskh;
+	int i;
+
+	pendl = read_giuint(GIUINTSTATL);
+	pendh = read_giuint(GIUINTSTATH);
+	maskl = read_giuint(GIUINTENL);
+	maskh = read_giuint(GIUINTENH);
+
+	maskl &= pendl;
+	maskh &= pendh;
+
+	if (maskl) {
+		for (i = 0; i < 16; i++) {
+			if (maskl & ((uint16_t)1 << i))
+				return i;
+		}
+	} else if (maskh) {
+		for (i = 0; i < 16; i++) {
+			if (maskh & ((uint16_t)1 << i))
+				return i + GIUINT_HIGH_OFFSET;
+		}
+	}
+
+	printk(KERN_ERR "spurious GIU interrupt: %04x(%04x),%04x(%04x)\n",
+	       maskl, pendl, maskh, pendh);
+
+	atomic_inc(&irq_err_count);
+
+	return -1;
+}
+
+static inline void ack_giuint_irq(int pin)
+{
+	if (pin < GIUINT_HIGH_OFFSET) {
+		clear_giuint(GIUINTENL, (uint16_t)1 << pin);
+		write_giuint((uint16_t)1 << pin, GIUINTSTATL);
+	} else {
+		pin -= GIUINT_HIGH_OFFSET;
+		clear_giuint(GIUINTENH, (uint16_t)1 << pin);
+		write_giuint((uint16_t)1 << pin, GIUINTSTATH);
+	}
+}
+
+static inline void end_giuint_irq(int pin)
+{
+	if (pin < GIUINT_HIGH_OFFSET)
+		set_giuint(GIUINTENL, (uint16_t)1 << pin);
+	else
+		set_giuint(GIUINTENH, (uint16_t)1 << (pin - GIUINT_HIGH_OFFSET));
+}
+
+void giuint_irq_dispatch(struct pt_regs *regs)
+{
+	struct vr41xx_giuint_cascade *cascade;
+	unsigned int giuint_irq;
+	int pin;
+
+	pin = get_irq_pin_number();
+	if (pin < 0)
+		return;
+
+	disable_irq(GIUINT_CASCADE_IRQ);
+
+	cascade = &giuint_cascade[pin];
+	giuint_irq = GIU_IRQ(pin);
+	if (cascade->flag == GIUINT_CASCADE) {
+		int irq = cascade->get_irq_number(giuint_irq);
+		ack_giuint_irq(pin);
+		if (irq >= 0)
+			do_IRQ(irq, regs);
+		end_giuint_irq(pin);
+	} else {
+		do_IRQ(giuint_irq, regs);
+	}
+
+	enable_irq(GIUINT_CASCADE_IRQ);
+}
+
+static int __init vr41xx_giu_init(void)
+{
+	int i;
+
+	switch (current_cpu_data.cputype) {
+	case CPU_VR4111:
+	case CPU_VR4121:
+		giu_base = GIUIOSELL_TYPE1;
+		break;
+	case CPU_VR4122:
+	case CPU_VR4131:
+	case CPU_VR4133:
+		giu_base = GIUIOSELL_TYPE2;
+		break;
+	default:
+		printk(KERN_ERR "GIU: Unexpected CPU of NEC VR4100 series\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < GIUINT_NR_IRQS; i++) {
+		if (i < GIUINT_HIGH_OFFSET)
+			clear_giuint(GIUINTENL, (uint16_t)1 << i);
+		else
+			clear_giuint(GIUINTENH, (uint16_t)1 << (i - GIUINT_HIGH_OFFSET));
+		giuint_cascade[i].flag = GIUINT_NO_CASCADE;
+		giuint_cascade[i].get_irq_number = no_irq_number;
+	}
+
+	return 0;
+}
+
+early_initcall(vr41xx_giu_init);