[ARM PATCH] 1937/1: LoCoMo common device

Patch from John Lenz

Cleanup and forward port of patch 1849.
This patch provides support for the SHARP LoCoMo device, 
a companion chip similar to the sa1111 device.  It is present
in many of the SHARP Zaurus line of PDAs.

arch/arm/Kconfig

@@ -222,6 +222,11 @@ config SA1111
 	depends on ASSABET_NEPONSET || SA1100_ADSBITSY || SA1100_BADGE4 || SA1100_CONSUS || SA1100_GRAPHICSMASTER || SA1100_JORNADA720 || ARCH_LUBBOCK || SA1100_PFS168 || SA1100_PT_SYSTEM3 || SA1100_XP860
 	default y
 
+config SHARP_LOCOMO
+	bool
+	depends on SA1100_COLLIE
+	default y
+
 config FORCE_MAX_ZONEORDER
 	int
 	depends on SA1111

arch/arm/common/Makefile

@@ -8,3 +8,4 @@ obj-$(CONFIG_SA1111)		+= sa1111.o
 obj-$(CONFIG_PCI_HOST_VIA82C505) += via82c505.o
 obj-$(CONFIG_DMABOUNCE)		+= dmabounce.o
 obj-$(CONFIG_TIMER_ACORN)	+= time-acorn.o
+obj-$(CONFIG_SHARP_LOCOMO)	+= locomo.o

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/config.h>
+#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/device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include <asm/hardware.h>
+#include <asm/mach-types.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+
+#include <asm/hardware/locomo.h>
+
+/* the following is the overall data for the locomo chip */
+struct locomo {
+	struct device *dev;
+	unsigned long phys;
+	unsigned int irq;
+	void *base;
+};
+
+struct locomo_dev_info {
+	unsigned long	offset;
+	unsigned long	length;
+	unsigned int	devid;
+	unsigned int	irq[1];
+	const char *	name;
+};
+
+static struct locomo_dev_info locomo_devices[] = {
+};
+
+
+/** 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 pt_regs *regs)
+{
+	int req, i;
+	struct irqdesc *d;
+	void *mapbase = get_irq_chipdata(irq);
+
+	/* Acknowledge the parent IRQ */
+	desc->chip->ack(irq);
+
+	/* check why this interrupt was generated */
+	req = locomo_readl(mapbase + LOCOMO_ICR) & 0x0f00;
+
+	if (req) {
+		/* generate the next interrupt(s) */
+		irq = LOCOMO_IRQ_START;
+		d = irq_desc + irq;
+		for (i = 0; i <= 3; i++, d++, irq++) {
+			if (req & (0x0100 << i)) {
+				d->handle(irq, d, regs);
+			}
+
+		}
+	}
+}
+
+static void locomo_ack_irq(unsigned int irq)
+{
+}
+
+static void locomo_mask_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_ICR);
+	r &= ~(0x0010 << (irq - LOCOMO_IRQ_START));
+	locomo_writel(r, mapbase + LOCOMO_ICR);
+}
+
+static void locomo_unmask_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_ICR);
+	r |= (0x0010 << (irq - LOCOMO_IRQ_START));
+	locomo_writel(r, mapbase + LOCOMO_ICR);
+}
+
+static struct irqchip locomo_chip = {
+	.ack	= locomo_ack_irq,
+	.mask	= locomo_mask_irq,
+	.unmask	= locomo_unmask_irq,
+};
+
+static void locomo_key_handler(unsigned int irq, struct irqdesc *desc,
+			    struct pt_regs *regs)
+{
+	struct irqdesc *d;
+	void *mapbase = get_irq_chipdata(irq);
+
+	if (locomo_readl(mapbase + LOCOMO_KIC) & 0x0001) {
+		d = irq_desc + LOCOMO_IRQ_KEY_START;
+		d->handle(LOCOMO_IRQ_KEY_START, d, regs);
+	}
+}
+
+static void locomo_key_ack_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_KIC);
+	r &= ~(0x0100 << (irq - LOCOMO_IRQ_KEY_START));
+	locomo_writel(r, mapbase + LOCOMO_KIC);
+}
+
+static void locomo_key_mask_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_KIC);
+	r &= ~(0x0010 << (irq - LOCOMO_IRQ_KEY_START));
+	locomo_writel(r, mapbase + LOCOMO_KIC);
+}
+
+static void locomo_key_unmask_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_KIC);
+	r |= (0x0010 << (irq - LOCOMO_IRQ_KEY_START));
+	locomo_writel(r, mapbase + LOCOMO_KIC);
+}
+
+static struct irqchip locomo_key_chip = {
+	.ack	= locomo_key_ack_irq,
+	.mask	= locomo_key_mask_irq,
+	.unmask	= locomo_key_unmask_irq,
+};
+
+static void locomo_gpio_handler(unsigned int irq, struct irqdesc *desc,
+			     struct pt_regs *regs)
+{
+	int req, i;
+	struct irqdesc *d;
+	void *mapbase = get_irq_chipdata(irq);
+
+	req = 	locomo_readl(mapbase + LOCOMO_GIR) &
+		locomo_readl(mapbase + LOCOMO_GPD) &
+		0xffff;
+
+	if (req) {
+		irq = LOCOMO_IRQ_GPIO_START;
+		d = irq_desc + LOCOMO_IRQ_GPIO_START;
+		for (i = 0; i <= 15; i++, irq++, d++) {
+			if (req & (0x0001 << i)) {
+				d->handle(irq, d, regs);
+			}
+		}
+	}
+}
+
+static void locomo_gpio_ack_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_GWE);
+	r |= (0x0001 << (irq - LOCOMO_IRQ_GPIO_START));
+	locomo_writel(r, mapbase + LOCOMO_GWE);
+
+	r = locomo_readl(mapbase + LOCOMO_GIS);
+	r &= ~(0x0001 << (irq - LOCOMO_IRQ_GPIO_START));
+	locomo_writel(r, mapbase + LOCOMO_GIS);
+
+	r = locomo_readl(mapbase + LOCOMO_GWE);
+	r &= ~(0x0001 << (irq - LOCOMO_IRQ_GPIO_START));
+	locomo_writel(r, mapbase + LOCOMO_GWE);
+}
+
+static void locomo_gpio_mask_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_GIE);
+	r &= ~(0x0001 << (irq - LOCOMO_IRQ_GPIO_START));
+	locomo_writel(r, mapbase + LOCOMO_GIE);
+}
+
+static void locomo_gpio_unmask_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_GIE);
+	r |= (0x0001 << (irq - LOCOMO_IRQ_GPIO_START));
+	locomo_writel(r, mapbase + LOCOMO_GIE);
+}
+
+static struct irqchip locomo_gpio_chip = {
+	.ack	= locomo_gpio_ack_irq,
+	.mask	= locomo_gpio_mask_irq,
+	.unmask	= locomo_gpio_unmask_irq,
+};
+
+static void locomo_lt_handler(unsigned int irq, struct irqdesc *desc,
+			   struct pt_regs *regs)
+{
+	struct irqdesc *d;
+	void *mapbase = get_irq_chipdata(irq);
+
+	if (locomo_readl(mapbase + LOCOMO_LTINT) & 0x0001) {
+		d = irq_desc + LOCOMO_IRQ_LT_START;
+		d->handle(LOCOMO_IRQ_LT_START, d, regs);
+	}
+}
+
+static void locomo_lt_ack_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_LTINT);
+	r &= ~(0x0100 << (irq - LOCOMO_IRQ_LT_START));
+	locomo_writel(r, mapbase + LOCOMO_LTINT);
+}
+
+static void locomo_lt_mask_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_LTINT);
+	r &= ~(0x0010 << (irq - LOCOMO_IRQ_LT_START));
+	locomo_writel(r, mapbase + LOCOMO_LTINT);
+}
+
+static void locomo_lt_unmask_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_LTINT);
+	r |= (0x0010 << (irq - LOCOMO_IRQ_LT_START));
+	locomo_writel(r, mapbase + LOCOMO_LTINT);
+}
+
+static struct irqchip locomo_lt_chip = {
+	.ack	= locomo_lt_ack_irq,
+	.mask	= locomo_lt_mask_irq,
+	.unmask	= locomo_lt_unmask_irq,
+};
+
+static void locomo_spi_handler(unsigned int irq, struct irqdesc *desc,
+			    struct pt_regs *regs)
+{
+	int req, i;
+	struct irqdesc *d;
+	void *mapbase = get_irq_chipdata(irq);
+
+	req = locomo_readl(mapbase + LOCOMO_SPIIR) & 0x000F;
+	if (req) {
+		irq = LOCOMO_IRQ_SPI_START;
+		d = irq_desc + irq;
+
+		for (i = 0; i <= 3; i++, irq++, d++) {
+			if (req & (0x0001 << i)) {
+				d->handle(irq, d, regs);
+			}
+		}
+	}
+}
+
+static void locomo_spi_ack_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_SPIWE);
+	r |= (0x0001 << (irq - LOCOMO_IRQ_SPI_START));
+	locomo_writel(r, mapbase + LOCOMO_SPIWE);
+
+	r = locomo_readl(mapbase + LOCOMO_SPIIS);
+	r &= ~(0x0001 << (irq - LOCOMO_IRQ_SPI_START));
+	locomo_writel(r, mapbase + LOCOMO_SPIIS);
+
+	r = locomo_readl(mapbase + LOCOMO_SPIWE);
+	r &= ~(0x0001 << (irq - LOCOMO_IRQ_SPI_START));
+	locomo_writel(r, mapbase + LOCOMO_SPIWE);
+}
+
+static void locomo_spi_mask_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_SPIIE);
+	r &= ~(0x0001 << (irq - LOCOMO_IRQ_SPI_START));
+	locomo_writel(r, mapbase + LOCOMO_SPIIE);
+}
+
+static void locomo_spi_unmask_irq(unsigned int irq)
+{
+	void *mapbase = get_irq_chipdata(irq);
+	unsigned int r;
+	r = locomo_readl(mapbase + LOCOMO_SPIIE);
+	r |= (0x0001 << (irq - LOCOMO_IRQ_SPI_START));
+	locomo_writel(r, mapbase + LOCOMO_SPIIE);
+}
+
+static struct irqchip locomo_spi_chip = {
+	.ack	= locomo_spi_ack_irq,
+	.mask	= locomo_spi_mask_irq,
+	.unmask	= locomo_spi_unmask_irq,
+};
+
+static void locomo_setup_irq(struct locomo *lchip)
+{
+	int irq;
+	void *irqbase = lchip->base;
+
+	/*
+	 * Install handler for IRQ_LOCOMO_HW.
+	 */
+	set_irq_type(lchip->irq, IRQT_FALLING);
+	set_irq_chipdata(lchip->irq, irqbase);
+	set_irq_chained_handler(lchip->irq, locomo_handler);
+
+	/* Install handlers for IRQ_LOCOMO_*_BASE */
+	set_irq_chip(IRQ_LOCOMO_KEY_BASE, &locomo_chip);
+	set_irq_chipdata(IRQ_LOCOMO_KEY_BASE, irqbase);
+	set_irq_chained_handler(IRQ_LOCOMO_KEY_BASE, locomo_key_handler);
+	set_irq_flags(IRQ_LOCOMO_KEY_BASE, IRQF_VALID | IRQF_PROBE);
+
+	set_irq_chip(IRQ_LOCOMO_GPIO_BASE, &locomo_chip);
+	set_irq_chipdata(IRQ_LOCOMO_GPIO_BASE, irqbase);
+	set_irq_chained_handler(IRQ_LOCOMO_GPIO_BASE, locomo_gpio_handler);
+	set_irq_flags(IRQ_LOCOMO_GPIO_BASE, IRQF_VALID | IRQF_PROBE);
+
+	set_irq_chip(IRQ_LOCOMO_LT_BASE, &locomo_chip);
+	set_irq_chipdata(IRQ_LOCOMO_LT_BASE, irqbase);
+	set_irq_chained_handler(IRQ_LOCOMO_LT_BASE, locomo_lt_handler);
+	set_irq_flags(IRQ_LOCOMO_LT_BASE, IRQF_VALID | IRQF_PROBE);
+
+	set_irq_chip(IRQ_LOCOMO_SPI_BASE, &locomo_chip);
+	set_irq_chipdata(IRQ_LOCOMO_SPI_BASE, irqbase);
+	set_irq_chained_handler(IRQ_LOCOMO_SPI_BASE, locomo_spi_handler);
+	set_irq_flags(IRQ_LOCOMO_SPI_BASE, IRQF_VALID | IRQF_PROBE);
+
+	/* install handlers for IRQ_LOCOMO_KEY_BASE generated interrupts */
+	set_irq_chip(LOCOMO_IRQ_KEY_START, &locomo_key_chip);
+	set_irq_chipdata(LOCOMO_IRQ_KEY_START, irqbase);
+	set_irq_handler(LOCOMO_IRQ_KEY_START, do_edge_IRQ);
+	set_irq_flags(LOCOMO_IRQ_KEY_START, IRQF_VALID | IRQF_PROBE);
+
+	/* install handlers for IRQ_LOCOMO_GPIO_BASE generated interrupts */
+	for (irq = LOCOMO_IRQ_GPIO_START; irq < LOCOMO_IRQ_GPIO_START + 16; irq++) {
+		set_irq_chip(irq, &locomo_gpio_chip);
+		set_irq_chipdata(irq, irqbase);
+		set_irq_handler(irq, do_edge_IRQ);
+		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+	}
+
+	/* install handlers for IRQ_LOCOMO_LT_BASE generated interrupts */
+	set_irq_chip(LOCOMO_IRQ_LT_START, &locomo_lt_chip);
+	set_irq_chipdata(LOCOMO_IRQ_LT_START, irqbase);
+	set_irq_handler(LOCOMO_IRQ_LT_START, do_edge_IRQ);
+	set_irq_flags(LOCOMO_IRQ_LT_START, IRQF_VALID | IRQF_PROBE);
+
+	/* install handlers for IRQ_LOCOMO_SPI_BASE generated interrupts */
+	for (irq = LOCOMO_IRQ_SPI_START; irq < LOCOMO_IRQ_SPI_START + 3; irq++) {
+		set_irq_chip(irq, &locomo_spi_chip);
+		set_irq_chipdata(irq, irqbase);
+		set_irq_handler(irq, do_edge_IRQ);
+		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+	}
+}
+
+
+static void locomo_dev_release(struct device *_dev)
+{
+	struct locomo_dev *dev = LOCOMO_DEV(_dev);
+
+	release_resource(&dev->res);
+	kfree(dev);
+}
+
+static int
+locomo_init_one_child(struct locomo *lchip, struct resource *parent,
+		      struct locomo_dev_info *info)
+{
+	struct locomo_dev *dev;
+	int ret;
+
+	dev = kmalloc(sizeof(struct locomo_dev), GFP_KERNEL);
+	if (!dev) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	memset(dev, 0, sizeof(struct locomo_dev));
+
+	strncpy(dev->dev.bus_id,info->name,sizeof(dev->dev.bus_id));
+	/*
+	 * If the parent device has a DMA mask associated with it,
+	 * propagate it down to the children.
+	 */
+	if (lchip->dev->dma_mask) {
+		dev->dma_mask = *lchip->dev->dma_mask;
+		dev->dev.dma_mask = &dev->dma_mask;
+	}
+
+	dev->devid	 = info->devid;
+	dev->dev.parent  = lchip->dev;
+	dev->dev.bus     = &locomo_bus_type;
+	dev->dev.release = locomo_dev_release;
+	dev->dev.coherent_dma_mask = lchip->dev->coherent_dma_mask;
+	dev->res.start   = lchip->phys + info->offset;
+	dev->res.end     = dev->res.start + info->length;
+	dev->res.name    = dev->dev.bus_id;
+	dev->res.flags   = IORESOURCE_MEM;
+	dev->mapbase     = lchip->base + info->offset;
+	memmove(dev->irq, info->irq, sizeof(dev->irq));
+
+	if (info->length) {
+		ret = request_resource(parent, &dev->res);
+		if (ret) {
+			printk("LoCoMo: failed to allocate resource for %s\n",
+				dev->res.name);
+			goto out;
+		}
+	}
+
+	ret = device_register(&dev->dev);
+	if (ret) {
+		release_resource(&dev->res);
+ out:
+		kfree(dev);
+	}
+	return ret;
+}
+
+/**
+ *	locomo_probe - probe for a single LoCoMo chip.
+ *	@phys_addr: physical address of device.
+ *
+ *	Probe for a LoCoMo chip.  This must be called
+ *	before any other locomo-specific code.
+ *
+ *	Returns:
+ *	%-ENODEV	device not found.
+ *	%-EBUSY		physical address already marked in-use.
+ *	%0		successful.
+ */
+static int
+__locomo_probe(struct device *me, struct resource *mem, int irq)
+{
+	struct locomo *lchip;
+	unsigned long r;
+	int i, ret = -ENODEV;
+
+	lchip = kmalloc(sizeof(struct locomo), GFP_KERNEL);
+	if (!lchip)
+		return -ENOMEM;
+
+	memset(lchip, 0, sizeof(struct locomo));
+
+	lchip->dev = me;
+	dev_set_drvdata(lchip->dev, lchip);
+
+	lchip->phys = mem->start;
+	lchip->irq = irq;
+
+	/*
+	 * Map the whole region.  This also maps the
+	 * registers for our children.
+	 */
+	lchip->base = ioremap(mem->start, PAGE_SIZE);
+	if (!lchip->base) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	/* locomo initialize */
+	locomo_writel(0, lchip->base + LOCOMO_ICR);
+	/* KEYBOARD */
+	locomo_writel(0, lchip->base + LOCOMO_KIC);
+
+	/* GPIO */
+	locomo_writel(0, lchip->base + LOCOMO_GPO);
+	locomo_writel( (LOCOMO_GPIO(2) | LOCOMO_GPIO(3) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
+			, lchip->base + LOCOMO_GPE);
+	locomo_writel( (LOCOMO_GPIO(2) | LOCOMO_GPIO(3) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
+			, lchip->base + LOCOMO_GPD);
+	locomo_writel(0, lchip->base + LOCOMO_GIE);
+
+	/* FrontLight */
+	locomo_writel(0, lchip->base + LOCOMO_ALS);
+	locomo_writel(0, lchip->base + LOCOMO_ALD);
+	/* Longtime timer */
+	locomo_writel(0, lchip->base + LOCOMO_LTINT);
+	/* SPI */
+	locomo_writel(0, lchip->base + LOCOMO_SPIIE);
+
+	locomo_writel(6 + 8 + 320 + 30 - 10, lchip->base + LOCOMO_ASD);
+	r = locomo_readl(lchip->base + LOCOMO_ASD);
+	r |= 0x8000;
+	locomo_writel(r, lchip->base + LOCOMO_ASD);
+
+	locomo_writel(6 + 8 + 320 + 30 - 10 - 128 + 4, lchip->base + LOCOMO_HSD);
+	r = locomo_readl(lchip->base + LOCOMO_HSD);
+	r |= 0x8000;
+	locomo_writel(r, lchip->base + LOCOMO_HSD);
+
+	locomo_writel(128 / 8, lchip->base + LOCOMO_HSC);
+
+	/* XON */
+	locomo_writel(0x80, lchip->base + LOCOMO_TADC);
+	udelay(1000);
+	/* CLK9MEN */
+	r = locomo_readl(lchip->base + LOCOMO_TADC);
+	r |= 0x10;
+	locomo_writel(r, lchip->base + LOCOMO_TADC);
+	udelay(100);
+
+	/* init DAC */
+	r = locomo_readl(lchip->base + LOCOMO_DAC);
+	r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
+	locomo_writel(r, lchip->base + LOCOMO_DAC);
+
+	r = locomo_readl(lchip->base + LOCOMO_VER);
+	printk(KERN_INFO "LoCoMo Chip: %lu%lu\n", (r >> 8), (r & 0xff));
+
+	/*
+	 * The interrupt controller must be initialised before any
+	 * other device to ensure that the interrupts are available.
+	 */
+	if (lchip->irq != NO_IRQ)
+		locomo_setup_irq(lchip);
+
+	for (i = 0; i < ARRAY_SIZE(locomo_devices); i++)
+		locomo_init_one_child(lchip, mem, &locomo_devices[i]);
+
+	return 0;
+
+ out:
+	kfree(lchip);
+	return ret;
+}
+
+static void __locomo_remove(struct locomo *lchip)
+{
+	struct list_head *l, *n;
+
+	list_for_each_safe(l, n, &lchip->dev->children) {
+		struct device *d = list_to_dev(l);
+
+		device_unregister(d);
+	}
+
+	if (lchip->irq != NO_IRQ) {
+		set_irq_chained_handler(lchip->irq, NULL);
+		set_irq_data(lchip->irq, NULL);
+	}
+
+	iounmap(lchip->base);
+	kfree(lchip);
+}
+
+static int locomo_probe(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct resource *mem = NULL, *irq = NULL;
+	int i;
+
+	for (i = 0; i < pdev->num_resources; i++) {
+		if (pdev->resource[i].flags & IORESOURCE_MEM)
+			mem = &pdev->resource[i];
+		if (pdev->resource[i].flags & IORESOURCE_IRQ)
+			irq = &pdev->resource[i];
+	}
+
+	return __locomo_probe(dev, mem, irq ? irq->start : NO_IRQ);
+}
+
+static int locomo_remove(struct device *dev)
+{
+	struct locomo *lchip = dev_get_drvdata(dev);
+
+	if (lchip) {
+		__locomo_remove(lchip);
+		dev_set_drvdata(dev, NULL);
+
+		kfree(dev->saved_state);
+		dev->saved_state = NULL;
+	}
+
+	return 0;
+}
+
+/*
+ *	Not sure if this should be on the system bus or not yet.
+ *	We really want some way to register a system device at
+ *	the per-machine level, and then have this driver pick
+ *	up the registered devices.
+ */
+static struct device_driver locomo_device_driver = {
+	.name		= "locomo",
+	.bus		= &platform_bus_type,
+	.probe		= locomo_probe,
+	.remove		= locomo_remove,
+};
+
+/*
+ *	Get the parent device driver (us) structure
+ *	from a child function device
+ */
+static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
+{
+	return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
+}
+
+/*
+ *	LoCoMo "Register Access Bus."
+ *
+ *	We model this as a regular bus type, and hang devices directly
+ *	off this.
+ */
+static int locomo_match(struct device *_dev, struct device_driver *_drv)
+{
+	struct locomo_dev *dev = LOCOMO_DEV(_dev);
+	struct locomo_driver *drv = LOCOMO_DRV(_drv);
+
+	return dev->devid == drv->devid;
+}
+
+static int locomo_bus_suspend(struct device *dev, u32 state)
+{
+	struct locomo_dev *ldev = LOCOMO_DEV(dev);
+	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
+	int ret = 0;
+
+	if (drv && drv->suspend)
+		ret = drv->suspend(ldev, state);
+	return ret;
+}
+
+static int locomo_bus_resume(struct device *dev)
+{
+	struct locomo_dev *ldev = LOCOMO_DEV(dev);
+	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
+	int ret = 0;
+
+	if (drv && drv->resume)
+		ret = drv->resume(ldev);
+	return ret;
+}
+
+static int locomo_bus_probe(struct device *dev)
+{
+	struct locomo_dev *ldev = LOCOMO_DEV(dev);
+	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
+	int ret = -ENODEV;
+
+	if (drv->probe)
+		ret = drv->probe(ldev);
+	return ret;
+}
+
+static int locomo_bus_remove(struct device *dev)
+{
+	struct locomo_dev *ldev = LOCOMO_DEV(dev);
+	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
+	int ret = 0;
+
+	if (drv->remove)
+		ret = drv->remove(ldev);
+	return ret;
+}
+
+struct bus_type locomo_bus_type = {
+	.name		= "locomo-bus",
+	.match		= locomo_match,
+	.suspend	= locomo_bus_suspend,
+	.resume		= locomo_bus_resume,
+};
+
+int locomo_driver_register(struct locomo_driver *driver)
+{
+	driver->drv.probe = locomo_bus_probe;
+	driver->drv.remove = locomo_bus_remove;
+	driver->drv.bus = &locomo_bus_type;
+	return driver_register(&driver->drv);
+}
+
+void locomo_driver_unregister(struct locomo_driver *driver)
+{
+	driver_unregister(&driver->drv);
+}
+
+static int __init locomo_init(void)
+{
+	int ret = bus_register(&locomo_bus_type);
+	if (ret == 0)
+		driver_register(&locomo_device_driver);
+	return ret;
+}
+
+static void __exit locomo_exit(void)
+{
+	driver_unregister(&locomo_device_driver);
+	bus_unregister(&locomo_bus_type);
+}
+
+module_init(locomo_init);
+module_exit(locomo_exit);
+
+MODULE_DESCRIPTION("Sharp LoCoMo core driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("John Lenz <jelenz@students.wisc.edu>");
+
+EXPORT_SYMBOL(locomo_driver_register);
+EXPORT_SYMBOL(locomo_driver_unregister);

include/asm-arm/arch-sa1100/irqs.h

@@ -121,10 +121,35 @@
 #define IRQ_S0_BVD1_STSCHG	(IRQ_BOARD_END + 53)
 #define IRQ_S1_BVD1_STSCHG	(IRQ_BOARD_END + 54)
 
+#define IRQ_LOCOMO_START	(IRQ_BOARD_END)
+#define IRQ_LOCOMO_KEY		(IRQ_BOARD_END + 0)
+#define IRQ_LOCOMO_GPIO0	(IRQ_BOARD_END + 1)
+#define IRQ_LOCOMO_GPIO1	(IRQ_BOARD_END + 2)
+#define IRQ_LOCOMO_GPIO2	(IRQ_BOARD_END + 3)
+#define IRQ_LOCOMO_GPIO3	(IRQ_BOARD_END + 4)
+#define IRQ_LOCOMO_GPIO4	(IRQ_BOARD_END + 5)
+#define IRQ_LOCOMO_GPIO5	(IRQ_BOARD_END + 6)
+#define IRQ_LOCOMO_GPIO6	(IRQ_BOARD_END + 7)
+#define IRQ_LOCOMO_GPIO7	(IRQ_BOARD_END + 8)
+#define IRQ_LOCOMO_GPIO8	(IRQ_BOARD_END + 9)
+#define IRQ_LOCOMO_GPIO9	(IRQ_BOARD_END + 10)
+#define IRQ_LOCOMO_GPIO10	(IRQ_BOARD_END + 11)
+#define IRQ_LOCOMO_GPIO11	(IRQ_BOARD_END + 12)
+#define IRQ_LOCOMO_GPIO12	(IRQ_BOARD_END + 13)
+#define IRQ_LOCOMO_GPIO13	(IRQ_BOARD_END + 14)
+#define IRQ_LOCOMO_GPIO14	(IRQ_BOARD_END + 15)
+#define IRQ_LOCOMO_GPIO15	(IRQ_BOARD_END + 16)
+#define IRQ_LOCOMO_LT		(IRQ_BOARD_END + 17)
+#define IRQ_LOCOMO_SPI_RFR	(IRQ_BOARD_END + 18)
+#define IRQ_LOCOMO_SPI_RFW	(IRQ_BOARD_END + 19)
+#define IRQ_LOCOMO_SPI_OVRN	(IRQ_BOARD_END + 20)
+#define IRQ_LOCOMO_SPI_TEND	(IRQ_BOARD_END + 21)
+
 /*
  * Figure out the MAX IRQ number.
  *
  * If we have an SA1111, the max IRQ is S1_BVD1_STSCHG+1.
+ * If we have an LoCoMo, the max IRQ is IRQ_LOCOMO_SPI_TEND+1
  * If graphicsclient or graphicsmaster, we don't have a SA1111.
  * Otherwise, we have the standard IRQs only.
  */
@@ -134,6 +159,8 @@
       defined(CONFIG_SA1100_GRAPHICSMASTER) || \
       defined(CONFIG_SA1100_H3800)
 #define NR_IRQS			(IRQ_BOARD_END)
+#elif defined(CONFIG_SHARP_LOCOMO)
+#define NR_IRQS			(IRQ_LOCOMO_SPI_TEND + 1)
 #else
 #define NR_IRQS			(IRQ_BOARD_START)
 #endif
@@ -150,6 +177,12 @@
 #define IRQ_SYSTEM3_SA1111	(IRQ_BOARD_START + 0)
 #define IRQ_SYSTEM3_SMC9196	(IRQ_BOARD_START + 1)
 
+/* LoCoMo Interrupts (CONFIG_SHARP_LOCOMO) */
+#define IRQ_LOCOMO_KEY_BASE	(IRQ_BOARD_START + 0)
+#define IRQ_LOCOMO_GPIO_BASE	(IRQ_BOARD_START + 1)
+#define IRQ_LOCOMO_LT_BASE	(IRQ_BOARD_START + 2)
+#define IRQ_LOCOMO_SPI_BASE	(IRQ_BOARD_START + 3)
+
 /* H3800-specific IRQs (CONFIG_SA1100_H3800) */
 #define H3800_KPIO_IRQ_START    (IRQ_BOARD_START)
 #define IRQ_H3800_KEY           (IRQ_BOARD_START + 0)

include/asm-arm/hardware/locomo.h

+/*
+ * linux/include/asm-arm/hardware/locomo.h
+ *
+ * This file contains the definitions for the LoCoMo G/A Chip
+ *
+ * (C) Copyright 2004 John Lenz
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License.  See linux/COPYING for more information.
+ *
+ * Based on sa1111.h
+ */
+#ifndef _ASM_ARCH_LOCOMO
+#define _ASM_ARCH_LOCOMO
+
+#define locomo_writel(val,addr)	({ *(volatile u16 *)(addr) = (val); })
+#define locomo_readl(addr)	(*(volatile u16 *)(addr))
+
+/* LOCOMO version */
+#define LOCOMO_VER	0x00
+
+/* Pin status */
+#define LOCOMO_ST	0x04
+
+/* Pin status */
+#define LOCOMO_C32K	0x08
+
+/* Interrupt controller */
+#define LOCOMO_ICR	0x0C
+
+/* MCS decoder for boot selecting */
+#define LOCOMO_MCSX0	0x10
+#define LOCOMO_MCSX1	0x14
+#define LOCOMO_MCSX2	0x18
+#define LOCOMO_MCSX3	0x1c
+
+/* Touch panel controller */
+#define LOCOMO_ASD	0x20	/* AD start delay */
+#define LOCOMO_HSD	0x28	/* HSYS delay */
+#define LOCOMO_HSC	0x2c	/* HSYS period */
+#define LOCOMO_TADC	0x30	/* tablet ADC clock */
+
+/* TFT signal */
+#define LOCOMO_TC	0x38	/* TFT control signal */
+#define LOCOMO_CPSD	0x3c	/* CPS delay */
+
+/* Key controller */
+#define LOCOMO_KIB	0x40	/* KIB level */
+#define LOCOMO_KSC	0x44	/* KSTRB control */
+#define LOCOMO_KCMD	0x48	/* KSTRB command */
+#define LOCOMO_KIC	0x4c	/* Key interrupt */
+
+/* Audio clock */
+#define LOCOMO_ACC	0x54
+
+/* SPI interface */
+#define LOCOMO_SPIMD	0x60	/* SPI mode setting */
+#define LOCOMO_SPICT	0x64	/* SPI mode control */
+#define LOCOMO_SPIST	0x68	/* SPI status */
+#define LOCOMO_SPIIS	0x70	/* SPI interrupt status */
+#define LOCOMO_SPIWE	0x74	/* SPI interrupt status write enable */
+#define LOCOMO_SPIIE	0x78	/* SPI interrupt enable */
+#define LOCOMO_SPIIR	0x7c	/* SPI interrupt request */
+#define LOCOMO_SPITD	0x80	/* SPI transfer data write */
+#define LOCOMO_SPIRD	0x84	/* SPI receive data read */
+#define LOCOMO_SPITS	0x88	/* SPI transfer data shift */
+#define LOCOMO_SPIRS	0x8C	/* SPI receive data shift */
+
+#define	LOCOMO_SPI_TEND	(1 << 3)	/* Transfer end bit */
+#define	LOCOMO_SPI_OVRN	(1 << 2)	/* Over Run bit */
+#define	LOCOMO_SPI_RFW	(1 << 1)	/* write buffer bit */
+#define	LOCOMO_SPI_RFR	(1)		/* read buffer bit */
+
+/* GPIO */
+#define LOCOMO_GPD	0x90	/* GPIO direction */
+#define LOCOMO_GPE	0x94	/* GPIO input enable */
+#define LOCOMO_GPL	0x98	/* GPIO level */
+#define LOCOMO_GPO	0x9c	/* GPIO out data setteing */
+#define LOCOMO_GRIE	0xa0	/* GPIO rise detection */
+#define LOCOMO_GFIE	0xa4	/* GPIO fall detection */
+#define LOCOMO_GIS	0xa8	/* GPIO edge detection status */
+#define LOCOMO_GWE	0xac	/* GPIO status write enable */
+#define LOCOMO_GIE	0xb0	/* GPIO interrupt enable */
+#define LOCOMO_GIR	0xb4	/* GPIO interrupt request */
+
+#define LOCOMO_GPIO0	(1<<0)
+#define LOCOMO_GPIO1	(1<<1)
+#define LOCOMO_GPIO2	(1<<2)
+#define LOCOMO_GPIO3	(1<<3)
+#define LOCOMO_GPIO4	(1<<4)
+#define LOCOMO_GPIO5	(1<<5)
+#define LOCOMO_GPIO6	(1<<6)
+#define LOCOMO_GPIO7	(1<<7)
+#define LOCOMO_GPIO8	(1<<8)
+#define LOCOMO_GPIO9	(1<<9)
+#define LOCOMO_GPIO10	(1<<10)
+#define LOCOMO_GPIO11	(1<<11)
+#define LOCOMO_GPIO12	(1<<12)
+#define LOCOMO_GPIO13	(1<<13)
+#define LOCOMO_GPIO14	(1<<14)
+#define LOCOMO_GPIO15	(1<<15)
+
+/* Front light adjustment controller */
+#define LOCOMO_ALS	0xc8	/* Adjust light cycle */
+#define LOCOMO_ALD	0xcc	/* Adjust light duty */
+
+/* PCM audio interface */
+#define LOCOMO_PAIF	0xd0
+
+/* Long time timer */
+#define LOCOMO_LTC	0xd8	/* LTC interrupt setting */
+#define LOCOMO_LTINT	0xdc	/* LTC interrupt */
+
+/* DAC control signal for LCD (COMADJ ) */
+#define LOCOMO_DAC	0xe0
+
+/* DAC control */
+#define	LOCOMO_DAC_SCLOEB	0x08	/* SCL pin output data       */
+#define	LOCOMO_DAC_TEST		0x04	/* Test bit                  */
+#define	LOCOMO_DAC_SDA		0x02	/* SDA pin level (read-only) */
+#define	LOCOMO_DAC_SDAOEB	0x01	/* SDA pin output data       */
+
+/* LED controller */
+#define LOCOMO_LPT0		0xe8	/* LEDPWM0 timer */
+#define LOCOMO_LPT1		0xec	/* LEDPWM1 timer */
+
+#define LOCOMO_LPT_TOFH		0x80			/* */
+#define LOCOMO_LPT_TOFL		0x08			/* */
+#define LOCOMO_LPT_TOH(TOH)	((TOH & 0x7) << 4)	/* */
+#define LOCOMO_LPT_TOL(TOL)	((TOL & 0x7))		/* */
+
+/* Audio clock */
+#define	LOCOMO_ACC_XON		0x80	/*  */
+#define	LOCOMO_ACC_XEN		0x40	/*  */
+#define	LOCOMO_ACC_XSEL0	0x00	/*  */
+#define	LOCOMO_ACC_XSEL1	0x20	/*  */
+#define	LOCOMO_ACC_MCLKEN	0x10	/*  */
+#define	LOCOMO_ACC_64FSEN	0x08	/*  */
+#define	LOCOMO_ACC_CLKSEL000	0x00	/* mclk  2 */
+#define	LOCOMO_ACC_CLKSEL001	0x01	/* mclk  3 */
+#define	LOCOMO_ACC_CLKSEL010	0x02	/* mclk  4 */
+#define	LOCOMO_ACC_CLKSEL011	0x03	/* mclk  6 */
+#define	LOCOMO_ACC_CLKSEL100	0x04	/* mclk  8 */
+#define	LOCOMO_ACC_CLKSEL101	0x05	/* mclk 12 */
+
+/* PCM audio interface */
+#define	LOCOMO_PAIF_SCINV	0x20	/*  */
+#define	LOCOMO_PAIF_SCEN	0x10	/*  */
+#define	LOCOMO_PAIF_LRCRST	0x08	/*  */
+#define	LOCOMO_PAIF_LRCEVE	0x04	/*  */
+#define	LOCOMO_PAIF_LRCINV	0x02	/*  */
+#define	LOCOMO_PAIF_LRCEN	0x01	/*  */
+
+/* GPIO */
+#define	LOCOMO_GPIO(Nb)		(0x01 << (Nb))	/* LoCoMo GPIO [0...15] */
+#define LOCOMO_GPIO_RTS		LOCOMO_GPIO(0)	/* LoCoMo GPIO  [0] */
+#define LOCOMO_GPIO_CTS		LOCOMO_GPIO(1)	/* LoCoMo GPIO  [1] */
+#define LOCOMO_GPIO_DSR		LOCOMO_GPIO(2)	/* LoCoMo GPIO  [2] */
+#define LOCOMO_GPIO_DTR		LOCOMO_GPIO(3)	/* LoCoMo GPIO  [3] */
+#define LOCOMO_GPIO_LCD_VSHA_ON	LOCOMO_GPIO(4)	/* LoCoMo GPIO  [4] */
+#define LOCOMO_GPIO_LCD_VSHD_ON	LOCOMO_GPIO(5)	/* LoCoMo GPIO  [5] */
+#define LOCOMO_GPIO_LCD_VEE_ON	LOCOMO_GPIO(6)	/* LoCoMo GPIO  [6] */
+#define LOCOMO_GPIO_LCD_MOD	LOCOMO_GPIO(7)	/* LoCoMo GPIO  [7] */
+#define LOCOMO_GPIO_DAC_ON	LOCOMO_GPIO(8)	/* LoCoMo GPIO  [8] */
+#define LOCOMO_GPIO_FL_VR	LOCOMO_GPIO(9)	/* LoCoMo GPIO  [9] */
+#define LOCOMO_GPIO_DAC_SDATA	LOCOMO_GPIO(10)	/* LoCoMo GPIO [10] */
+#define LOCOMO_GPIO_DAC_SCK	LOCOMO_GPIO(11)	/* LoCoMo GPIO [11] */
+#define LOCOMO_GPIO_DAC_SLOAD	LOCOMO_GPIO(12)	/* LoCoMo GPIO [12] */
+
+extern struct bus_type locomo_bus_type;
+
+struct locomo_dev {
+	struct device	dev;
+	unsigned int	devid;
+	struct resource	res;
+	void		*mapbase;
+	unsigned int	irq[1];
+	u64		dma_mask;
+};
+
+#define LOCOMO_DEV(_d)	container_of((_d), struct locomo_dev, dev)
+
+#define locomo_get_drvdata(d)	dev_get_drvdata(&(d)->dev)
+#define locomo_set_drvdata(d,p)	dev_set_drvdata(&(d)->dev, p)
+
+struct locomo_driver {
+	struct device_driver	drv;
+	unsigned int		devid;
+	int (*probe)(struct locomo_dev *);
+	int (*remove)(struct locomo_dev *);
+	int (*suspend)(struct locomo_dev *, u32);
+	int (*resume)(struct locomo_dev *);
+};
+
+#define LOCOMO_DRV(_d)	container_of((_d), struct locomo_driver, drv)
+
+#define LOCOMO_DRIVER_NAME(_ldev) ((_ldev)->dev.driver->name)
+
+void locomo_lcd_power(struct locomo_dev *, int, unsigned int);
+
+int locomo_driver_register(struct locomo_driver *);
+void locomo_driver_unregister(struct locomo_driver *);
+
+#endif