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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/common/scoop.c
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'arch/arm/common/scoop.c')
-rw-r--r--arch/arm/common/scoop.c176
1 files changed, 176 insertions, 0 deletions
diff --git a/arch/arm/common/scoop.c b/arch/arm/common/scoop.c
new file mode 100644
index 00000000000..cfd0d3e550d
--- /dev/null
+++ b/arch/arm/common/scoop.c
@@ -0,0 +1,176 @@
+/*
+ * 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 <asm/io.h>
+#include <asm/hardware/scoop.h>
+
+#define SCOOP_REG(d,adr) (*(volatile unsigned short*)(d +(adr)))
+
+struct scoop_dev {
+ void *base;
+ spinlock_t scoop_lock;
+ u32 scoop_gpwr;
+};
+
+void reset_scoop(struct device *dev)
+{
+ struct scoop_dev *sdev = dev_get_drvdata(dev);
+
+ SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100; // 00
+ SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000; // 04
+ SCOOP_REG(sdev->base,SCOOP_CPR) = 0x0000; // 0C
+ SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000; // 10
+ SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000; // 18
+ SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF; // 14
+ SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000; // 1C
+ SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
+}
+
+unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
+{
+ unsigned short gpio_bit;
+ unsigned long flag;
+ struct scoop_dev *sdev = dev_get_drvdata(dev);
+
+ spin_lock_irqsave(&sdev->scoop_lock, flag);
+ gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit;
+ SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
+ spin_unlock_irqrestore(&sdev->scoop_lock, flag);
+
+ return gpio_bit;
+}
+
+unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
+{
+ unsigned short gpio_bit;
+ unsigned long flag;
+ struct scoop_dev *sdev = dev_get_drvdata(dev);
+
+ spin_lock_irqsave(&sdev->scoop_lock, flag);
+ gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
+ SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
+ spin_unlock_irqrestore(&sdev->scoop_lock, flag);
+
+ return gpio_bit;
+}
+
+EXPORT_SYMBOL(set_scoop_gpio);
+EXPORT_SYMBOL(reset_scoop_gpio);
+
+unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
+{
+ struct scoop_dev *sdev = dev_get_drvdata(dev);
+ return SCOOP_REG(sdev->base,reg);
+}
+
+void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
+{
+ struct scoop_dev *sdev = dev_get_drvdata(dev);
+ SCOOP_REG(sdev->base,reg)=data;
+}
+
+EXPORT_SYMBOL(reset_scoop);
+EXPORT_SYMBOL(read_scoop_reg);
+EXPORT_SYMBOL(write_scoop_reg);
+
+#ifdef CONFIG_PM
+static int scoop_suspend(struct device *dev, uint32_t state, uint32_t level)
+{
+ if (level == SUSPEND_POWER_DOWN) {
+ struct scoop_dev *sdev = dev_get_drvdata(dev);
+
+ sdev->scoop_gpwr = SCOOP_REG(sdev->base,SCOOP_GPWR);
+ SCOOP_REG(sdev->base,SCOOP_GPWR) = 0;
+ }
+ return 0;
+}
+
+static int scoop_resume(struct device *dev, uint32_t level)
+{
+ if (level == RESUME_POWER_ON) {
+ struct scoop_dev *sdev = dev_get_drvdata(dev);
+
+ SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
+ }
+ return 0;
+}
+#else
+#define scoop_suspend NULL
+#define scoop_resume NULL
+#endif
+
+int __init scoop_probe(struct device *dev)
+{
+ struct scoop_dev *devptr;
+ struct scoop_config *inf;
+ struct platform_device *pdev = to_platform_device(dev);
+ struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ if (!mem)
+ return -EINVAL;
+
+ devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL);
+
+ if (!devptr)
+ return -ENOMEM;
+
+ memset(devptr, 0, sizeof(struct scoop_dev));
+ spin_lock_init(&devptr->scoop_lock);
+
+ inf = dev->platform_data;
+ devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
+
+ if (!devptr->base) {
+ kfree(devptr);
+ return -ENOMEM;
+ }
+
+ dev_set_drvdata(dev, devptr);
+
+ printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
+
+ SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
+ reset_scoop(dev);
+ SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
+ SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
+
+ return 0;
+}
+
+static int scoop_remove(struct device *dev)
+{
+ struct scoop_dev *sdev = dev_get_drvdata(dev);
+ if (sdev) {
+ iounmap(sdev->base);
+ kfree(sdev);
+ dev_set_drvdata(dev, NULL);
+ }
+ return 0;
+}
+
+static struct device_driver scoop_driver = {
+ .name = "sharp-scoop",
+ .bus = &platform_bus_type,
+ .probe = scoop_probe,
+ .remove = scoop_remove,
+ .suspend = scoop_suspend,
+ .resume = scoop_resume,
+};
+
+int __init scoop_init(void)
+{
+ return driver_register(&scoop_driver);
+}
+
+subsys_initcall(scoop_init);