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Linux/arch/arc/kernel/arc_hostlink.c

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  1 /*
  2  * arc_hostlink.c: Pseudo-driver for Metaware provided "hostlink" facility
  3  *
  4  * Allows Linux userland access to host in absence of any peripherals.
  5  *
  6  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  */
 12 
 13 #include <linux/fs.h>           /* file_operations */
 14 #include <linux/miscdevice.h>
 15 #include <linux/mm.h>           /* VM_IO */
 16 #include <linux/module.h>
 17 #include <linux/uaccess.h>
 18 
 19 static unsigned char __HOSTLINK__[4 * PAGE_SIZE] __aligned(PAGE_SIZE);
 20 
 21 static int arc_hl_mmap(struct file *fp, struct vm_area_struct *vma)
 22 {
 23         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 24 
 25         if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
 26                                vma->vm_end - vma->vm_start,
 27                                vma->vm_page_prot)) {
 28                 pr_warn("Hostlink buffer mmap ERROR\n");
 29                 return -EAGAIN;
 30         }
 31         return 0;
 32 }
 33 
 34 static long arc_hl_ioctl(struct file *file, unsigned int cmd,
 35                         unsigned long arg)
 36 {
 37         /* we only support, returning the physical addr to mmap in user space */
 38         put_user((unsigned int)__HOSTLINK__, (int __user *)arg);
 39         return 0;
 40 }
 41 
 42 static const struct file_operations arc_hl_fops = {
 43         .unlocked_ioctl = arc_hl_ioctl,
 44         .mmap           = arc_hl_mmap,
 45 };
 46 
 47 static struct miscdevice arc_hl_dev = {
 48         .minor  = MISC_DYNAMIC_MINOR,
 49         .name   = "hostlink",
 50         .fops   = &arc_hl_fops
 51 };
 52 
 53 static int __init arc_hl_init(void)
 54 {
 55         pr_info("ARC Hostlink driver mmap at 0x%p\n", __HOSTLINK__);
 56         return misc_register(&arc_hl_dev);
 57 }
 58 module_init(arc_hl_init);
 59 

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