path: root/arch/arm/common/locomo.c

/*
 * linux/arch/arm/common/locomo.c
 *
 * Sharp LoCoMo support
 *
 * 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.
 *
 * This file contains all generic LoCoMo support.
 *
 * All initialization functions provided here are intended to be called
 * from machine specific code with proper arguments when required.
 *
 * Based on sa1111.c
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>

#include <asm/hardware/locomo.h>

/* M62332 output channel selection */
#define M62332_EVR_CH	1	/* M62332 volume channel number  */
				/*   0 : CH.1 , 1 : CH. 2        */
/* DAC send data */
#define	M62332_SLAVE_ADDR	0x4e	/* Slave address  */
#define	M62332_W_BIT		0x00	/* W bit (0 only) */
#define	M62332_SUB_ADDR		0x00	/* Sub address    */
#define	M62332_A_BIT		0x00	/* A bit (0 only) */

/* DAC setup and hold times (expressed in us) */
#define DAC_BUS_FREE_TIME	5	/*   4.7 us */
#define DAC_START_SETUP_TIME	5	/*   4.7 us */
#define DAC_STOP_SETUP_TIME	4	/*   4.0 us */
#define DAC_START_HOLD_TIME	5	/*   4.7 us */
#define DAC_SCL_LOW_HOLD_TIME	5	/*   4.7 us */
#define DAC_SCL_HIGH_HOLD_TIME	4	/*   4.0 us */
#define DAC_DATA_SETUP_TIME	1	/*   250 ns */
#define DAC_DATA_HOLD_TIME	1	/*   300 ns */
#define DAC_LOW_SETUP_TIME	1	/*   300 ns */
#define DAC_HIGH_SETUP_TIME	1	/*  1000 ns */

/* the following is the overall data for the locomo chip */
struct locomo {
	struct device *dev;
	unsigned long phys;
	unsigned int irq;
	spinlock_t lock;
	void __iomem *base;
};

struct locomo_dev_info {
	unsigned long	offset;
	unsigned long	length;
	unsigned int	devid;
	unsigned int	irq[1];
	const char *	name;
};

/* All the locomo devices.  If offset is non-zero, the mapbase for the
 * locomo_dev will be set to the chip base plus offset.  If offset is
 * zero, then the mapbase for the locomo_dev will be set to zero.  An
 * offset of zero means the device only uses GPIOs or other helper
 * functions inside this file */
static struct locomo_dev_info locomo_devices[] = {
	{
		.devid 		= LOCOMO_DEVID_KEYBOARD,
		.irq = {
			IRQ_LOCOMO_KEY,
		},
		.name		= "locomo-keyboard",
		.offset		= LOCOMO_KEYBOARD,
		.length		= 16,
	},
	{
		.devid		= LOCOMO_DEVID_FRONTLIGHT,
		.irq		= {},
		.name		= "locomo-frontlight",
		.offset		= LOCOMO_FRONTLIGHT,
		.length		= 8,

	},
	{
		.devid		= LOCOMO_DEVID_BACKLIGHT,
		.irq		= {},
		.name		= "locomo-backlight",
		.offset		= LOCOMO_BACKLIGHT,
		.length		= 8,
	},
	{
		.devid		= LOCOMO_DEVID_AUDIO,
		.irq		= {},
		.name		= "locomo-audio",
		.offset		= LOCOMO_AUDIO,
		.length		= 4,
	},
	{
		.devid		= LOCOMO_DEVID_LED,
		.irq 		= {},
		.name		= "locomo-led",
		.offset		= LOCOMO_LED,
		.length		= 8,
	},
	{
		.devid		= LOCOMO_DEVID_UART,
		.irq		= {},
		.name		= "locomo-uart",
		.offset		= 0,
		.length		= 0,
	},
};


/** LoCoMo interrupt handling stuff.
 * NOTE: LoCoMo has a 1 to many mapping on all of its IRQs.
 * that is, there is only one real hardware interrupt
 * we determine which interrupt it is by reading some IO memory.
 * We have two levels of expansion, first in the handler for the
 * hardware interrupt we generate an interrupt
 * IRQ_LOCOMO_*_BASE and those handlers generate more interrupts
 *
 * hardware irq reads LOCOMO_ICR & 0x0f00
 *   IRQ_LOCOMO_KEY_BASE
 *   IRQ_LOCOMO_GPIO_BASE
 *   IRQ_LOCOMO_LT_BASE
 *   IRQ_LOCOMO_SPI_BASE
 * IRQ_LOCOMO_KEY_BASE reads LOCOMO_KIC & 0x0001
 *   IRQ_LOCOMO_KEY
 * IRQ_LOCOMO_GPIO_BASE reads LOCOMO_GIR & LOCOMO_GPD & 0xffff
 *   IRQ_LOCOMO_GPIO[0-15]
 * IRQ_LOCOMO_LT_BASE reads LOCOMO_LTINT & 0x0001
 *   IRQ_LOCOMO_LT
 * IRQ_LOCOMO_SPI_BASE reads LOCOMO_SPIIR & 0x000F
 *   IRQ_LOCOMO_SPI_RFR
 *   IRQ_LOCOMO_SPI_RFW
 *   IRQ_LOCOMO_SPI_OVRN
 *   IRQ_LOCOMO_SPI_TEND
 */

#define LOCOMO_IRQ_START	(IRQ_LOCOMO_KEY_BASE)
#define LOCOMO_IRQ_KEY_START	(IRQ_LOCOMO_KEY)
#define	LOCOMO_IRQ_GPIO_START	(IRQ_LOCOMO_GPIO0)
#define	LOCOMO_IRQ_LT_START	(IRQ_LOCOMO_LT)
#define	LOCOMO_IRQ_SPI_START	(IRQ_LOCOMO_SPI_RFR)

static void locomo_handler(unsigned int irq, struct irqdesc *desc,
			struct