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!

1 files changed, 255 insertions, 0 deletions

diff --git a/drivers/sbus/char/flash.c b/drivers/sbus/char/flash.c
new file mode 100644
index 000000000000..6bdd768b731d
--- /dev/null
+++ b/drivers/sbus/char/flash.c
@@ -0,0 +1,255 @@
+/* $Id: flash.c,v 1.25 2001/12/21 04:56:16 davem Exp $
+ * flash.c: Allow mmap access to the OBP Flash, for OBP updates.
+ *
+ * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/fcntl.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/smp_lock.h>
+#include <linux/spinlock.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/io.h>
+#include <asm/sbus.h>
+#include <asm/ebus.h>
+#include <asm/upa.h>
+
+static DEFINE_SPINLOCK(flash_lock);
+static struct {
+	unsigned long read_base;	/* Physical read address */
+	unsigned long write_base;	/* Physical write address */
+	unsigned long read_size;	/* Size of read area */
+	unsigned long write_size;	/* Size of write area */
+	unsigned long busy;		/* In use? */
+} flash;
+
+#define FLASH_MINOR	152
+
+static int
+flash_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	unsigned long addr;
+	unsigned long size;
+
+	spin_lock(&flash_lock);
+	if (flash.read_base == flash.write_base) {
+		addr = flash.read_base;
+		size = flash.read_size;
+	} else {
+		if ((vma->vm_flags & VM_READ) &&
+		    (vma->vm_flags & VM_WRITE)) {
+			spin_unlock(&flash_lock);
+			return -EINVAL;
+		}
+		if (vma->vm_flags & VM_READ) {
+			addr = flash.read_base;
+			size = flash.read_size;
+		} else if (vma->vm_flags & VM_WRITE) {
+			addr = flash.write_base;
+			size = flash.write_size;
+		} else {
+			spin_unlock(&flash_lock);
+			return -ENXIO;
+		}
+	}
+	spin_unlock(&flash_lock);
+
+	if ((vma->vm_pgoff << PAGE_SHIFT) > size)
+		return -ENXIO;
+	addr = vma->vm_pgoff + (addr >> PAGE_SHIFT);
+
+	if (vma->vm_end - (vma->vm_start + (vma->vm_pgoff << PAGE_SHIFT)) > size)
+		size = vma->vm_end - (vma->vm_start + (vma->vm_pgoff << PAGE_SHIFT));
+
+	pgprot_val(vma->vm_page_prot) &= ~(_PAGE_CACHE);
+	pgprot_val(vma->vm_page_prot) |= _PAGE_E;
+	vma->vm_flags |= (VM_SHM | VM_LOCKED);
+
+	if (io_remap_pfn_range(vma, vma->vm_start, addr, size, vma->vm_page_prot))
+		return -EAGAIN;
+		
+	return 0;
+}
+
+static long long
+flash_llseek(struct file *file, long long offset, int origin)
+{
+	lock_kernel();
+	switch (origin) {
+		case 0:
+			file->f_pos = offset;
+			break;
+		case 1:
+			file->f_pos += offset;
+			if (file->f_pos > flash.read_size)
+				file->f_pos = flash.read_size;
+			break;
+		case 2:
+			file->f_pos = flash.read_size;
+			break;
+		default:
+			unlock_kernel();
+			return -EINVAL;
+	}
+	unlock_kernel();
+	return file->f_pos;
+}
+
+static ssize_t
+flash_read(struct file * file, char __user * buf,
+	   size_t count, loff_t *ppos)
+{
+	unsigned long p = file->f_pos;
+	int i;
+	
+	if (count > flash.read_size - p)
+		count = flash.read_size - p;
+
+	for (i = 0; i < count; i++) {
+		u8 data = upa_readb(flash.read_base + p + i);
+		if (put_user(data, buf))
+			return -EFAULT;
+		buf++;
+	}
+
+	file->f_pos += count;
+	return count;
+}
+
+static int
+flash_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, (void *)&flash.busy) != 0)
+		return -EBUSY;
+
+	return 0;
+}
+
+static int
+flash_release(struct inode *inode, struct file *file)
+{
+	spin_lock(&flash_lock);
+	flash.busy = 0;
+	spin_unlock(&flash_lock);
+
+	return 0;
+}
+
+static struct file_operations flash_fops = {
+	/* no write to the Flash, use mmap
+	 * and play flash dependent tricks.
+	 */
+	.owner =	THIS_MODULE,
+	.llseek =	flash_llseek,
+	.read =		flash_read,
+	.mmap =		flash_mmap,
+	.open =		flash_open,
+	.release =	flash_release,
+};
+
+static struct miscdevice flash_dev = { FLASH_MINOR, "flash", &flash_fops };
+
+static int __init flash_init(void)
+{
+	struct sbus_bus *sbus;
+	struct sbus_dev *sdev = NULL;
+#ifdef CONFIG_PCI
+	struct linux_ebus *ebus;
+	struct linux_ebus_device *edev = NULL;
+	struct linux_prom_registers regs[2];
+	int len, nregs;
+#endif
+	int err;
+
+	for_all_sbusdev(sdev, sbus) {
+		if (!strcmp(sdev->prom_name, "flashprom")) {
+			if (sdev->reg_addrs[0].phys_addr == sdev->reg_addrs[1].phys_addr) {
+				flash.read_base = ((unsigned long)sdev->reg_addrs[0].phys_addr) |
+					(((unsigned long)sdev->reg_addrs[0].which_io)<<32UL);
+				flash.read_size = sdev->reg_addrs[0].reg_size;
+				flash.write_base = flash.read_base;
+				flash.write_size = flash.read_size;
+			} else {
+				flash.read_base = ((unsigned long)sdev->reg_addrs[0].phys_addr) |
+					(((unsigned long)sdev->reg_addrs[0].which_io)<<32UL);
+				flash.read_size = sdev->reg_addrs[0].reg_size;
+				flash.write_base = ((unsigned long)sdev->reg_addrs[1].phys_addr) |
+					(((unsigned long)sdev->reg_addrs[1].which_io)<<32UL);
+				flash.write_size = sdev->reg_addrs[1].reg_size;
+			}
+			flash.busy = 0;
+			break;
+		}
+	}
+	if (!sdev) {
+#ifdef CONFIG_PCI
+		for_each_ebus(ebus) {
+			for_each_ebusdev(edev, ebus) {
+				if (!strcmp(edev->prom_name, "flashprom"))
+					goto ebus_done;
+			}
+		}
+	ebus_done:
+		if (!edev)
+			return -ENODEV;
+
+		len = prom_getproperty(edev->prom_node, "reg", (void *)regs, sizeof(regs));
+		if ((len % sizeof(regs[0])) != 0) {
+			printk("flash: Strange reg property size %d\n", len);
+			return -ENODEV;
+		}
+
+		nregs = len / sizeof(regs[0]);
+
+		flash.read_base = edev->resource[0].start;
+		flash.read_size = regs[0].reg_size;
+
+		if (nregs == 1) {
+			flash.write_base = edev->resource[0].start;
+			flash.write_size = regs[0].reg_size;
+		} else if (nregs == 2) {
+			flash.write_base = edev->resource[1].start;
+			flash.write_size = regs[1].reg_size;
+		} else {
+			printk("flash: Strange number of regs %d\n", nregs);
+			return -ENODEV;
+		}
+
+		flash.busy = 0;
+
+#else
+		return -ENODEV;
+#endif
+	}
+
+	printk("OBP Flash: RD %lx[%lx] WR %lx[%lx]\n",
+	       flash.read_base, flash.read_size,
+	       flash.write_base, flash.write_size);
+
+	err = misc_register(&flash_dev);
+	if (err) {
+		printk(KERN_ERR "flash: unable to get misc minor\n");
+		return err;
+	}
+
+	return 0;
+}
+
+static void __exit flash_cleanup(void)
+{
+	misc_deregister(&flash_dev);
+}
+
+module_init(flash_init);
+module_exit(flash_cleanup);
+MODULE_LICENSE("GPL");