-/*****************************************************************************
-* Copyright 2010 - 2011 Broadcom Corporation. All rights reserved.
-*
-* Unless you and Broadcom execute a separate written software license
-* agreement governing use of this software, this software is licensed to you
-* under the terms of the GNU General Public License version 2, available at
-* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
-*
-* Notwithstanding the above, under no circumstances may you combine this
-* software in any way with any other Broadcom software provided under a
-* license other than the GPL, without Broadcom's express prior written
-* consent.
-*****************************************************************************/
+/*
+ * Copyright 2010 - 2011 Broadcom Corporation. All rights reserved.
+ *
+ * Unless you and Broadcom execute a separate written software license
+ * agreement governing use of this software, this software is licensed to you
+ * under the terms of the GNU General Public License version 2, available at
+ * http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+ *
+ * Notwithstanding the above, under no circumstances may you combine this
+ * software in any way with any other Broadcom software provided under a
+ * license other than the GPL, without Broadcom's express prior written
+ * consent.
+ */
#include <linux/kernel.h>
#include <linux/module.h>
#define DRIVER_NAME "vc-mem"
-// Device (/dev) related variables
-static dev_t vc_mem_devnum = 0;
-static struct class *vc_mem_class = NULL;
+/* Device (/dev) related variables */
+static dev_t vc_mem_devnum;
+static struct class *vc_mem_class;
static struct cdev vc_mem_cdev;
-static int vc_mem_inited = 0;
+static int vc_mem_inited;
#ifdef CONFIG_DEBUG_FS
static struct dentry *vc_mem_debugfs_entry;
* bootloader (and/or kernel). When that happens, the values of these variables
* would be calculated and assigned in the init function.
*/
-// in the 2835 VC in mapped above ARM, but ARM has full access to VC space
-unsigned long mm_vc_mem_phys_addr = 0x00000000;
-unsigned int mm_vc_mem_size = 0;
-unsigned int mm_vc_mem_base = 0;
-
+/* In the 2835 VC in mapped above ARM, but ARM has full access to VC space */
+unsigned long mm_vc_mem_phys_addr;
EXPORT_SYMBOL(mm_vc_mem_phys_addr);
+unsigned int mm_vc_mem_size;
EXPORT_SYMBOL(mm_vc_mem_size);
+unsigned int mm_vc_mem_base;
EXPORT_SYMBOL(mm_vc_mem_base);
-static uint phys_addr = 0;
-static uint mem_size = 0;
-static uint mem_base = 0;
-
-
-/****************************************************************************
-*
-* vc_mem_open
-*
-***************************************************************************/
+static uint phys_addr;
+static uint mem_size;
+static uint mem_base;
static int
vc_mem_open(struct inode *inode, struct file *file)
{
- (void) inode;
- (void) file;
+ (void)inode;
pr_debug("%s: called file = 0x%p\n", __func__, file);
return 0;
}
-/****************************************************************************
-*
-* vc_mem_release
-*
-***************************************************************************/
-
static int
vc_mem_release(struct inode *inode, struct file *file)
{
- (void) inode;
- (void) file;
+ (void)inode;
pr_debug("%s: called file = 0x%p\n", __func__, file);
return 0;
}
-/****************************************************************************
-*
-* vc_mem_get_size
-*
-***************************************************************************/
-
static void
vc_mem_get_size(void)
{
}
-/****************************************************************************
-*
-* vc_mem_get_base
-*
-***************************************************************************/
-
static void
vc_mem_get_base(void)
{
}
-/****************************************************************************
-*
-* vc_mem_get_current_size
-*
-***************************************************************************/
-
int
vc_mem_get_current_size(void)
{
return mm_vc_mem_size;
}
-
EXPORT_SYMBOL_GPL(vc_mem_get_current_size);
-/****************************************************************************
-*
-* vc_mem_ioctl
-*
-***************************************************************************/
-
static long
vc_mem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
case VC_MEM_IOC_MEM_PHYS_ADDR:
{
pr_debug("%s: VC_MEM_IOC_MEM_PHYS_ADDR=0x%p\n",
- __func__, (void *) mm_vc_mem_phys_addr);
+ __func__, (void *)mm_vc_mem_phys_addr);
- if (copy_to_user((void *) arg, &mm_vc_mem_phys_addr,
- sizeof (mm_vc_mem_phys_addr)) != 0) {
+ if (copy_to_user((void *)arg, &mm_vc_mem_phys_addr,
+ sizeof(mm_vc_mem_phys_addr))) {
rc = -EFAULT;
}
break;
}
case VC_MEM_IOC_MEM_SIZE:
{
- // Get the videocore memory size first
+ /* Get the videocore memory size first */
vc_mem_get_size();
pr_debug("%s: VC_MEM_IOC_MEM_SIZE=%x\n", __func__,
- mm_vc_mem_size);
+ mm_vc_mem_size);
- if (copy_to_user((void *) arg, &mm_vc_mem_size,
- sizeof (mm_vc_mem_size)) != 0) {
+ if (copy_to_user((void *)arg, &mm_vc_mem_size,
+ sizeof(mm_vc_mem_size))) {
rc = -EFAULT;
}
break;
}
case VC_MEM_IOC_MEM_BASE:
{
- // Get the videocore memory base
+ /* Get the videocore memory base */
vc_mem_get_base();
pr_debug("%s: VC_MEM_IOC_MEM_BASE=%x\n", __func__,
- mm_vc_mem_base);
+ mm_vc_mem_base);
- if (copy_to_user((void *) arg, &mm_vc_mem_base,
- sizeof (mm_vc_mem_base)) != 0) {
+ if (copy_to_user((void *)arg, &mm_vc_mem_base,
+ sizeof(mm_vc_mem_base))) {
rc = -EFAULT;
}
break;
}
case VC_MEM_IOC_MEM_LOAD:
{
- // Get the videocore memory base
+ /* Get the videocore memory base */
vc_mem_get_base();
pr_debug("%s: VC_MEM_IOC_MEM_LOAD=%x\n", __func__,
mm_vc_mem_base);
- if (copy_to_user((void *) arg, &mm_vc_mem_base,
- sizeof (mm_vc_mem_base)) != 0) {
+ if (copy_to_user((void *)arg, &mm_vc_mem_base,
+ sizeof(mm_vc_mem_base))) {
rc = -EFAULT;
}
break;
}
#endif
-/****************************************************************************
-*
-* vc_mem_mmap
-*
-***************************************************************************/
-
static int
vc_mem_mmap(struct file *filp, struct vm_area_struct *vma)
{
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
pr_debug("%s: vm_start = 0x%08lx vm_end = 0x%08lx vm_pgoff = 0x%08lx\n",
- __func__, (long) vma->vm_start, (long) vma->vm_end,
- (long) vma->vm_pgoff);
+ __func__, (long)vma->vm_start, (long)vma->vm_end,
+ (long)vma->vm_pgoff);
if (offset + length > mm_vc_mem_size) {
pr_err("%s: length %ld is too big\n", __func__, length);
return -EINVAL;
}
- // Do not cache the memory map
+ /* Do not cache the memory map */
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
rc = remap_pfn_range(vma, vma->vm_start,
(mm_vc_mem_phys_addr >> PAGE_SHIFT) +
vma->vm_pgoff, length, vma->vm_page_prot);
- if (rc != 0) {
+ if (rc)
pr_err("%s: remap_pfn_range failed (rc=%d)\n", __func__, rc);
- }
return rc;
}
-/****************************************************************************
-*
-* File Operations for the driver.
-*
-***************************************************************************/
-
+/* File Operations for the driver. */
static const struct file_operations vc_mem_fops = {
.owner = THIS_MODULE,
.open = vc_mem_open,
vc_mem_debugfs_entry,
(u32 *)&mm_vc_mem_phys_addr)) {
dev_warn(dev, "%s:could not create vc_mem_phys entry\n",
- __func__);
+ __func__);
goto fail;
}
vc_mem_debugfs_entry,
(u32 *)&mm_vc_mem_size)) {
dev_warn(dev, "%s:could not create vc_mem_size entry\n",
- __func__);
+ __func__);
goto fail;
}
#endif /* CONFIG_DEBUG_FS */
-
-/****************************************************************************
-*
-* vc_mem_init
-*
-***************************************************************************/
+/* Module load/unload functions */
static int __init
vc_mem_init(void)
vc_mem_get_size();
pr_info("vc-mem: phys_addr:0x%08lx mem_base=0x%08x mem_size:0x%08x(%u MiB)\n",
- mm_vc_mem_phys_addr, mm_vc_mem_base, mm_vc_mem_size, mm_vc_mem_size / (1024 * 1024));
+ mm_vc_mem_phys_addr, mm_vc_mem_base, mm_vc_mem_size,
+ mm_vc_mem_size / (1024 * 1024));
- if ((rc = alloc_chrdev_region(&vc_mem_devnum, 0, 1, DRIVER_NAME)) < 0) {
+ rc = alloc_chrdev_region(&vc_mem_devnum, 0, 1, DRIVER_NAME);
+ if (rc < 0) {
pr_err("%s: alloc_chrdev_region failed (rc=%d)\n",
__func__, rc);
goto out_err;
}
cdev_init(&vc_mem_cdev, &vc_mem_fops);
- if ((rc = cdev_add(&vc_mem_cdev, vc_mem_devnum, 1)) != 0) {
+ rc = cdev_add(&vc_mem_cdev, vc_mem_devnum, 1);
+ if (rc) {
pr_err("%s: cdev_add failed (rc=%d)\n", __func__, rc);
goto out_unregister;
}
device_destroy(vc_mem_class, vc_mem_devnum);
- out_class_destroy:
+out_class_destroy:
class_destroy(vc_mem_class);
vc_mem_class = NULL;
- out_cdev_del:
+out_cdev_del:
cdev_del(&vc_mem_cdev);
- out_unregister:
+out_unregister:
unregister_chrdev_region(vc_mem_devnum, 1);
- out_err:
+out_err:
return -1;
}
-/****************************************************************************
-*
-* vc_mem_exit
-*
-***************************************************************************/
-
static void __exit
vc_mem_exit(void)
{
-/*****************************************************************************
-* Copyright 2010 - 2011 Broadcom Corporation. All rights reserved.
-*
-* Unless you and Broadcom execute a separate written software license
-* agreement governing use of this software, this software is licensed to you
-* under the terms of the GNU General Public License version 2, available at
-* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
-*
-* Notwithstanding the above, under no circumstances may you combine this
-* software in any way with any other Broadcom software provided under a
-* license other than the GPL, without Broadcom's express prior written
-* consent.
-*****************************************************************************/
+/*
+ * Copyright 2010 - 2011 Broadcom Corporation. All rights reserved.
+ *
+ * Unless you and Broadcom execute a separate written software license
+ * agreement governing use of this software, this software is licensed to you
+ * under the terms of the GNU General Public License version 2, available at
+ * http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+ *
+ * Notwithstanding the above, under no circumstances may you combine this
+ * software in any way with any other Broadcom software provided under a
+ * license other than the GPL, without Broadcom's express prior written
+ * consent.
+ */
#ifndef _VC_MEM_H
#define _VC_MEM_H
#define VC_MEM_IOC_MAGIC 'v'
-#define VC_MEM_IOC_MEM_PHYS_ADDR _IOR( VC_MEM_IOC_MAGIC, 0, unsigned long )
-#define VC_MEM_IOC_MEM_SIZE _IOR( VC_MEM_IOC_MAGIC, 1, unsigned int )
-#define VC_MEM_IOC_MEM_BASE _IOR( VC_MEM_IOC_MAGIC, 2, unsigned int )
-#define VC_MEM_IOC_MEM_LOAD _IOR( VC_MEM_IOC_MAGIC, 3, unsigned int )
+#define VC_MEM_IOC_MEM_PHYS_ADDR _IOR(VC_MEM_IOC_MAGIC, 0, unsigned long)
+#define VC_MEM_IOC_MEM_SIZE _IOR(VC_MEM_IOC_MAGIC, 1, unsigned int)
+#define VC_MEM_IOC_MEM_BASE _IOR(VC_MEM_IOC_MAGIC, 2, unsigned int)
+#define VC_MEM_IOC_MEM_LOAD _IOR(VC_MEM_IOC_MAGIC, 3, unsigned int)
-#if defined( __KERNEL__ )
+#ifdef __KERNEL__
#define VC_MEM_TO_ARM_ADDR_MASK 0x3FFFFFFF
extern unsigned long mm_vc_mem_phys_addr;
extern unsigned int mm_vc_mem_size;
-extern int vc_mem_get_current_size( void );
+extern int vc_mem_get_current_size(void);
#endif
#ifdef CONFIG_COMPAT
projects / platform / kernel / linux-rpi3.git / commitdiff