2008-08-27 16:13:12 +08:00
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/* flash.c: Allow mmap access to the OBP Flash, for OBP updates.
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2005-04-17 06:20:36 +08:00
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*
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* Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/miscdevice.h>
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#include <linux/fcntl.h>
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#include <linux/poll.h>
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2010-07-21 14:36:39 +08:00
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#include <linux/mutex.h>
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2005-04-17 06:20:36 +08:00
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#include <linux/spinlock.h>
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2007-05-31 16:27:52 +08:00
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#include <linux/mm.h>
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2008-08-27 16:13:12 +08:00
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#include <linux/of.h>
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#include <linux/of_device.h>
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2005-04-17 06:20:36 +08:00
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2016-12-25 03:46:01 +08:00
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#include <linux/uaccess.h>
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2005-04-17 06:20:36 +08:00
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#include <asm/pgtable.h>
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#include <asm/io.h>
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#include <asm/upa.h>
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2010-07-21 14:36:39 +08:00
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static DEFINE_MUTEX(flash_mutex);
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2005-04-17 06:20:36 +08:00
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static DEFINE_SPINLOCK(flash_lock);
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static struct {
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unsigned long read_base; /* Physical read address */
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unsigned long write_base; /* Physical write address */
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unsigned long read_size; /* Size of read area */
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unsigned long write_size; /* Size of write area */
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unsigned long busy; /* In use? */
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} flash;
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#define FLASH_MINOR 152
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static int
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flash_mmap(struct file *file, struct vm_area_struct *vma)
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{
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unsigned long addr;
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unsigned long size;
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spin_lock(&flash_lock);
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if (flash.read_base == flash.write_base) {
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addr = flash.read_base;
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size = flash.read_size;
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} else {
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if ((vma->vm_flags & VM_READ) &&
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(vma->vm_flags & VM_WRITE)) {
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spin_unlock(&flash_lock);
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return -EINVAL;
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}
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if (vma->vm_flags & VM_READ) {
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addr = flash.read_base;
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size = flash.read_size;
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} else if (vma->vm_flags & VM_WRITE) {
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addr = flash.write_base;
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size = flash.write_size;
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} else {
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spin_unlock(&flash_lock);
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return -ENXIO;
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}
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}
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spin_unlock(&flash_lock);
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if ((vma->vm_pgoff << PAGE_SHIFT) > size)
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return -ENXIO;
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addr = vma->vm_pgoff + (addr >> PAGE_SHIFT);
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if (vma->vm_end - (vma->vm_start + (vma->vm_pgoff << PAGE_SHIFT)) > size)
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size = vma->vm_end - (vma->vm_start + (vma->vm_pgoff << PAGE_SHIFT));
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2006-03-21 18:29:39 +08:00
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vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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2005-04-17 06:20:36 +08:00
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if (io_remap_pfn_range(vma, vma->vm_start, addr, size, vma->vm_page_prot))
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return -EAGAIN;
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return 0;
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}
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static long long
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flash_llseek(struct file *file, long long offset, int origin)
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{
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2010-07-21 14:36:39 +08:00
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mutex_lock(&flash_mutex);
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2005-04-17 06:20:36 +08:00
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switch (origin) {
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case 0:
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file->f_pos = offset;
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break;
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case 1:
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file->f_pos += offset;
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if (file->f_pos > flash.read_size)
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file->f_pos = flash.read_size;
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break;
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case 2:
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file->f_pos = flash.read_size;
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break;
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default:
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2010-07-21 14:36:39 +08:00
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mutex_unlock(&flash_mutex);
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2005-04-17 06:20:36 +08:00
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return -EINVAL;
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}
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2010-07-21 14:36:39 +08:00
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mutex_unlock(&flash_mutex);
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2005-04-17 06:20:36 +08:00
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return file->f_pos;
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}
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static ssize_t
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flash_read(struct file * file, char __user * buf,
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size_t count, loff_t *ppos)
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{
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2010-04-28 09:48:52 +08:00
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loff_t p = *ppos;
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2005-04-17 06:20:36 +08:00
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int i;
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2010-04-28 09:48:52 +08:00
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2005-04-17 06:20:36 +08:00
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if (count > flash.read_size - p)
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count = flash.read_size - p;
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for (i = 0; i < count; i++) {
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u8 data = upa_readb(flash.read_base + p + i);
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if (put_user(data, buf))
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return -EFAULT;
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buf++;
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}
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2010-04-28 09:48:52 +08:00
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*ppos += count;
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2005-04-17 06:20:36 +08:00
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return count;
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}
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static int
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flash_open(struct inode *inode, struct file *file)
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{
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2010-07-21 14:36:39 +08:00
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mutex_lock(&flash_mutex);
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2008-05-21 01:15:54 +08:00
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if (test_and_set_bit(0, (void *)&flash.busy) != 0) {
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2010-07-21 14:36:39 +08:00
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mutex_unlock(&flash_mutex);
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2005-04-17 06:20:36 +08:00
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return -EBUSY;
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2008-05-21 01:15:54 +08:00
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}
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2005-04-17 06:20:36 +08:00
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2010-07-21 14:36:39 +08:00
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mutex_unlock(&flash_mutex);
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2005-04-17 06:20:36 +08:00
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return 0;
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}
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static int
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flash_release(struct inode *inode, struct file *file)
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{
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spin_lock(&flash_lock);
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flash.busy = 0;
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spin_unlock(&flash_lock);
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return 0;
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}
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2007-02-12 16:55:34 +08:00
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static const struct file_operations flash_fops = {
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2005-04-17 06:20:36 +08:00
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/* no write to the Flash, use mmap
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* and play flash dependent tricks.
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*/
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.owner = THIS_MODULE,
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.llseek = flash_llseek,
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.read = flash_read,
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.mmap = flash_mmap,
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.open = flash_open,
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.release = flash_release,
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};
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static struct miscdevice flash_dev = { FLASH_MINOR, "flash", &flash_fops };
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2012-12-22 05:24:23 +08:00
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static int flash_probe(struct platform_device *op)
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2005-04-17 06:20:36 +08:00
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{
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2010-04-14 07:12:29 +08:00
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struct device_node *dp = op->dev.of_node;
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2008-08-27 16:13:12 +08:00
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struct device_node *parent;
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2005-04-17 06:20:36 +08:00
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2008-08-27 16:13:12 +08:00
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parent = dp->parent;
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2005-04-17 06:20:36 +08:00
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2018-12-06 03:50:38 +08:00
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if (!of_node_name_eq(parent, "sbus") &&
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!of_node_name_eq(parent, "sbi") &&
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!of_node_name_eq(parent, "ebus"))
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2005-04-17 06:20:36 +08:00
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return -ENODEV;
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2008-08-27 16:13:12 +08:00
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flash.read_base = op->resource[0].start;
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flash.read_size = resource_size(&op->resource[0]);
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if (op->resource[1].flags) {
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flash.write_base = op->resource[1].start;
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flash.write_size = resource_size(&op->resource[1]);
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} else {
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flash.write_base = op->resource[0].start;
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flash.write_size = resource_size(&op->resource[0]);
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2005-04-17 06:20:36 +08:00
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}
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2008-08-27 16:13:12 +08:00
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flash.busy = 0;
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2005-04-17 06:20:36 +08:00
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2017-07-19 05:43:27 +08:00
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printk(KERN_INFO "%pOF: OBP Flash, RD %lx[%lx] WR %lx[%lx]\n",
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op->dev.of_node,
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2005-04-17 06:20:36 +08:00
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flash.read_base, flash.read_size,
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flash.write_base, flash.write_size);
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2008-08-27 16:13:12 +08:00
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return misc_register(&flash_dev);
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}
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2012-12-22 05:24:23 +08:00
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static int flash_remove(struct platform_device *op)
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2008-08-27 16:13:12 +08:00
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{
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misc_deregister(&flash_dev);
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2005-04-17 06:20:36 +08:00
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return 0;
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}
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2008-08-31 16:23:17 +08:00
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static const struct of_device_id flash_match[] = {
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2008-08-27 16:13:12 +08:00
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{
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.name = "flashprom",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, flash_match);
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2011-02-23 11:01:33 +08:00
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static struct platform_driver flash_driver = {
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2010-04-14 07:13:02 +08:00
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.driver = {
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.name = "flash",
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.of_match_table = flash_match,
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},
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2008-08-27 16:13:12 +08:00
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.probe = flash_probe,
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2012-12-22 05:24:23 +08:00
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.remove = flash_remove,
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2008-08-27 16:13:12 +08:00
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};
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2011-11-27 03:04:25 +08:00
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module_platform_driver(flash_driver);
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2005-04-17 06:20:36 +08:00
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MODULE_LICENSE("GPL");
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