Linux 3.4

[thirdparty/linux.git] / arch / arm / mach-ixp4xx / common.c

/*
 * arch/arm/mach-ixp4xx/common.c
 *
 * Generic code shared across all IXP4XX platforms
 *
 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
 *
 * Copyright 2002 (c) Intel Corporation
 * Copyright 2003-2004 (c) MontaVista, Software, Inc. 
 * 
 * This file is licensed under  the terms of the GNU General Public 
 * License version 2. This program is licensed "as is" without any 
 * warranty of any kind, whether express or implied.
 */

#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/platform_device.h>
#include <linux/serial_core.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/io.h>
#include <linux/export.h>

#include <mach/udc.h>
#include <mach/hardware.h>
#include <mach/io.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/irq.h>
#include <asm/sched_clock.h>
#include <asm/system_misc.h>

#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>

static void __init ixp4xx_clocksource_init(void);
static void __init ixp4xx_clockevent_init(void);
static struct clock_event_device clockevent_ixp4xx;

/*************************************************************************
 * IXP4xx chipset I/O mapping
 *************************************************************************/
static struct map_desc ixp4xx_io_desc[] __initdata = {
	{	/* UART, Interrupt ctrl, GPIO, timers, NPEs, MACs, USB .... */
		.virtual	= IXP4XX_PERIPHERAL_BASE_VIRT,
		.pfn		= __phys_to_pfn(IXP4XX_PERIPHERAL_BASE_PHYS),
		.length		= IXP4XX_PERIPHERAL_REGION_SIZE,
		.type		= MT_DEVICE
	}, {	/* Expansion Bus Config Registers */
		.virtual	= IXP4XX_EXP_CFG_BASE_VIRT,
		.pfn		= __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS),
		.length		= IXP4XX_EXP_CFG_REGION_SIZE,
		.type		= MT_DEVICE
	}, {	/* PCI Registers */
		.virtual	= IXP4XX_PCI_CFG_BASE_VIRT,
		.pfn		= __phys_to_pfn(IXP4XX_PCI_CFG_BASE_PHYS),
		.length		= IXP4XX_PCI_CFG_REGION_SIZE,
		.type		= MT_DEVICE
	},
#ifdef CONFIG_DEBUG_LL
	{	/* Debug UART mapping */
		.virtual	= IXP4XX_DEBUG_UART_BASE_VIRT,
		.pfn		= __phys_to_pfn(IXP4XX_DEBUG_UART_BASE_PHYS),
		.length		= IXP4XX_DEBUG_UART_REGION_SIZE,
		.type		= MT_DEVICE
	}
#endif
};

void __init ixp4xx_map_io(void)
{
  	iotable_init(ixp4xx_io_desc, ARRAY_SIZE(ixp4xx_io_desc));
}


/*************************************************************************
 * IXP4xx chipset IRQ handling
 *
 * TODO: GPIO IRQs should be marked invalid until the user of the IRQ
 *       (be it PCI or something else) configures that GPIO line
 *       as an IRQ.
 **************************************************************************/
enum ixp4xx_irq_type {
	IXP4XX_IRQ_LEVEL, IXP4XX_IRQ_EDGE
};

/* Each bit represents an IRQ: 1: edge-triggered, 0: level triggered */
static unsigned long long ixp4xx_irq_edge = 0;

/*
 * IRQ -> GPIO mapping table
 */
static signed char irq2gpio[32] = {
	-1, -1, -1, -1, -1, -1,  0,  1,
	-1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1,  2,  3,  4,  5,  6,
	 7,  8,  9, 10, 11, 12, -1, -1,
};

int gpio_to_irq(int gpio)
{
	int irq;

	for (irq = 0; irq < 32; irq++) {
		if (irq2gpio[irq] == gpio)
			return irq;
	}
	return -EINVAL;
}
EXPORT_SYMBOL(gpio_to_irq);

int irq_to_gpio(unsigned int irq)
{
	int gpio = (irq < 32) ? irq2gpio[irq] : -EINVAL;

	if (gpio == -1)
		return -EINVAL;

	return gpio;
}
EXPORT_SYMBOL(irq_to_gpio);

static int ixp4xx_set_irq_type(struct irq_data *d, unsigned int type)
{
	int line = irq2gpio[d->irq];
	u32 int_style;
	enum ixp4xx_irq_type irq_type;
	volatile u32 *int_reg;

	/*
	 * Only for GPIO IRQs
	 */
	if (line < 0)
		return -EINVAL;