initial_commit

1 files changed, 283 insertions, 0 deletions

diff --git a/arch/arm/common/scoop.c b/arch/arm/common/scoop.c
new file mode 100644
index 00000000..c11af1e4
--- /dev/null
+++ b/arch/arm/common/scoop.c
@@ -0,0 +1,283 @@
+/*
+ * Support code for the SCOOP interface found on various Sharp PDAs
+ *
+ * Copyright (c) 2004 Richard Purdie
+ *
+ *	Based on code written by Sharp/Lineo for 2.4 kernels
+ *
+ * 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/device.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <asm/gpio.h>
+#include <asm/hardware/scoop.h>
+
+/* PCMCIA to Scoop linkage
+
+   There is no easy way to link multiple scoop devices into one
+   single entity for the pxa2xx_pcmcia device so this structure
+   is used which is setup by the platform code.
+
+   This file is never modular so this symbol is always
+   accessile to the board support files.
+*/
+struct scoop_pcmcia_config *platform_scoop_config;
+EXPORT_SYMBOL(platform_scoop_config);
+
+struct  scoop_dev {
+	void __iomem *base;
+	struct gpio_chip gpio;
+	spinlock_t scoop_lock;
+	unsigned short suspend_clr;
+	unsigned short suspend_set;
+	u32 scoop_gpwr;
+};
+
+void reset_scoop(struct device *dev)
+{
+	struct scoop_dev *sdev = dev_get_drvdata(dev);
+
+	iowrite16(0x0100, sdev->base + SCOOP_MCR);  /* 00 */
+	iowrite16(0x0000, sdev->base + SCOOP_CDR);  /* 04 */
+	iowrite16(0x0000, sdev->base + SCOOP_CCR);  /* 10 */
+	iowrite16(0x0000, sdev->base + SCOOP_IMR);  /* 18 */
+	iowrite16(0x00FF, sdev->base + SCOOP_IRM);  /* 14 */
+	iowrite16(0x0000, sdev->base + SCOOP_ISR);  /* 1C */
+	iowrite16(0x0000, sdev->base + SCOOP_IRM);
+}
+
+static void __scoop_gpio_set(struct scoop_dev *sdev,
+			unsigned offset, int value)
+{
+	unsigned short gpwr;
+
+	gpwr = ioread16(sdev->base + SCOOP_GPWR);
+	if (value)
+		gpwr |= 1 << (offset + 1);
+	else
+		gpwr &= ~(1 << (offset + 1));
+	iowrite16(gpwr, sdev->base + SCOOP_GPWR);
+}
+
+static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
+	unsigned long flags;
+
+	spin_lock_irqsave(&sdev->scoop_lock, flags);
+
+	__scoop_gpio_set(sdev, offset, value);
+
+	spin_unlock_irqrestore(&sdev->scoop_lock, flags);
+}
+
+static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
+
+	/* XXX: I'm unsure, but it seems so */
+	return ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1));
+}
+
+static int scoop_gpio_direction_input(struct gpio_chip *chip,
+			unsigned offset)
+{
+	struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
+	unsigned long flags;
+	unsigned short gpcr;
+
+	spin_lock_irqsave(&sdev->scoop_lock, flags);
+
+	gpcr = ioread16(sdev->base + SCOOP_GPCR);
+	gpcr &= ~(1 << (offset + 1));
+	iowrite16(gpcr, sdev->base + SCOOP_GPCR);
+
+	spin_unlock_irqrestore(&sdev->scoop_lock, flags);
+
+	return 0;
+}
+
+static int scoop_gpio_direction_output(struct gpio_chip *chip,
+			unsigned offset, int value)
+{
+	struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
+	unsigned long flags;
+	unsigned short gpcr;
+
+	spin_lock_irqsave(&sdev->scoop_lock, flags);
+
+	__scoop_gpio_set(sdev, offset, value);
+
+	gpcr = ioread16(sdev->base + SCOOP_GPCR);
+	gpcr |= 1 << (offset + 1);
+	iowrite16(gpcr, sdev->base + SCOOP_GPCR);
+
+	spin_unlock_irqrestore(&sdev->scoop_lock, flags);
+
+	return 0;
+}
+
+unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
+{
+	struct scoop_dev *sdev = dev_get_drvdata(dev);
+	return ioread16(sdev->base + reg);
+}
+
+void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
+{
+	struct scoop_dev *sdev = dev_get_drvdata(dev);
+	iowrite16(data, sdev->base + reg);
+}
+
+EXPORT_SYMBOL(reset_scoop);
+EXPORT_SYMBOL(read_scoop_reg);
+EXPORT_SYMBOL(write_scoop_reg);
+
+#ifdef CONFIG_PM
+static void check_scoop_reg(struct scoop_dev *sdev)
+{
+	unsigned short mcr;
+
+	mcr = ioread16(sdev->base + SCOOP_MCR);
+	if ((mcr & 0x100) == 0)
+		iowrite16(0x0101, sdev->base + SCOOP_MCR);
+}
+
+static int scoop_suspend(struct platform_device *dev, pm_message_t state)
+{
+	struct scoop_dev *sdev = platform_get_drvdata(dev);
+
+	check_scoop_reg(sdev);
+	sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR);
+	iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR);
+
+	return 0;
+}
+
+static int scoop_resume(struct platform_device *dev)
+{
+	struct scoop_dev *sdev = platform_get_drvdata(dev);
+
+	check_scoop_reg(sdev);
+	iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR);
+
+	return 0;
+}
+#else
+#define scoop_suspend	NULL
+#define scoop_resume	NULL
+#endif
+
+static int __devinit scoop_probe(struct platform_device *pdev)
+{
+	struct scoop_dev *devptr;
+	struct scoop_config *inf;
+	struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	int ret;
+	int temp;
+
+	if (!mem)
+		return -EINVAL;
+
+	devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
+	if (!devptr)
+		return -ENOMEM;
+
+	spin_lock_init(&devptr->scoop_lock);
+
+	inf = pdev->dev.platform_data;
+	devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
+
+	if (!devptr->base) {
+		ret = -ENOMEM;
+		goto err_ioremap;
+	}
+
+	platform_set_drvdata(pdev, devptr);
+
+	printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base);
+
+	iowrite16(0x0140, devptr->base + SCOOP_MCR);
+	reset_scoop(&pdev->dev);
+	iowrite16(0x0000, devptr->base + SCOOP_CPR);
+	iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR);
+	iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR);
+
+	devptr->suspend_clr = inf->suspend_clr;
+	devptr->suspend_set = inf->suspend_set;
+
+	devptr->gpio.base = -1;
+
+	if (inf->gpio_base != 0) {
+		devptr->gpio.label = dev_name(&pdev->dev);
+		devptr->gpio.base = inf->gpio_base;
+		devptr->gpio.ngpio = 12; /* PA11 = 0, PA12 = 1, etc. up to PA22 = 11 */
+		devptr->gpio.set = scoop_gpio_set;
+		devptr->gpio.get = scoop_gpio_get;
+		devptr->gpio.direction_input = scoop_gpio_direction_input;
+		devptr->gpio.direction_output = scoop_gpio_direction_output;
+
+		ret = gpiochip_add(&devptr->gpio);
+		if (ret)
+			goto err_gpio;
+	}
+
+	return 0;
+
+	if (devptr->gpio.base != -1)
+		temp = gpiochip_remove(&devptr->gpio);
+err_gpio:
+	platform_set_drvdata(pdev, NULL);
+err_ioremap:
+	iounmap(devptr->base);
+	kfree(devptr);
+
+	return ret;
+}
+
+static int __devexit scoop_remove(struct platform_device *pdev)
+{
+	struct scoop_dev *sdev = platform_get_drvdata(pdev);
+	int ret;
+
+	if (!sdev)
+		return -EINVAL;
+
+	if (sdev->gpio.base != -1) {
+		ret = gpiochip_remove(&sdev->gpio);
+		if (ret) {
+			dev_err(&pdev->dev, "Can't remove gpio chip: %d\n", ret);
+			return ret;
+		}
+	}
+
+	platform_set_drvdata(pdev, NULL);
+	iounmap(sdev->base);
+	kfree(sdev);
+
+	return 0;
+}
+
+static struct platform_driver scoop_driver = {
+	.probe		= scoop_probe,
+	.remove		= __devexit_p(scoop_remove),
+	.suspend	= scoop_suspend,
+	.resume		= scoop_resume,
+	.driver		= {
+		.name	= "sharp-scoop",
+	},
+};
+
+static int __init scoop_init(void)
+{
+	return platform_driver_register(&scoop_driver);
+}
+
+subsys_initcall(scoop_init);