+++ /dev/null
-From cfdf39199781b73840dfdfb7d1281b398c1334cf Mon Sep 17 00:00:00 2001
-From: popcornmix <popcornmix@gmail.com>
-Date: Fri, 28 Oct 2016 15:36:43 +0100
-Subject: [PATCH] vc_mem: Add vc_mem driver for querying firmware
- memory addresses
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Signed-off-by: popcornmix <popcornmix@gmail.com>
-
-BCM270x: Move vc_mem
-
-Make the vc_mem module available for ARCH_BCM2835 by moving it.
-
-Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
----
- drivers/char/broadcom/Kconfig | 18 ++
- drivers/char/broadcom/Makefile | 1 +
- drivers/char/broadcom/vc_mem.c | 422 ++++++++++++++++++++++++++++++++
- include/linux/broadcom/vc_mem.h | 35 +++
- 4 files changed, 476 insertions(+)
- create mode 100644 drivers/char/broadcom/Kconfig
- create mode 100644 drivers/char/broadcom/Makefile
- create mode 100644 drivers/char/broadcom/vc_mem.c
- create mode 100644 include/linux/broadcom/vc_mem.h
-
---- /dev/null
-+++ b/drivers/char/broadcom/Kconfig
-@@ -0,0 +1,18 @@
-+#
-+# Broadcom char driver config
-+#
-+
-+menuconfig BRCM_CHAR_DRIVERS
-+ bool "Broadcom Char Drivers"
-+ help
-+ Broadcom's char drivers
-+
-+if BRCM_CHAR_DRIVERS
-+
-+config BCM2708_VCMEM
-+ bool "Videocore Memory"
-+ default y
-+ help
-+ Helper for videocore memory access and total size allocation.
-+
-+endif
---- /dev/null
-+++ b/drivers/char/broadcom/Makefile
-@@ -0,0 +1 @@
-+obj-$(CONFIG_BCM2708_VCMEM) += vc_mem.o
---- /dev/null
-+++ b/drivers/char/broadcom/vc_mem.c
-@@ -0,0 +1,422 @@
-+/*****************************************************************************
-+* 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>
-+#include <linux/fs.h>
-+#include <linux/device.h>
-+#include <linux/cdev.h>
-+#include <linux/mm.h>
-+#include <linux/slab.h>
-+#include <linux/debugfs.h>
-+#include <linux/uaccess.h>
-+#include <linux/dma-mapping.h>
-+#include <linux/broadcom/vc_mem.h>
-+
-+#define DRIVER_NAME "vc-mem"
-+
-+// Device (/dev) related variables
-+static dev_t vc_mem_devnum = 0;
-+static struct class *vc_mem_class = NULL;
-+static struct cdev vc_mem_cdev;
-+static int vc_mem_inited = 0;
-+
-+#ifdef CONFIG_DEBUG_FS
-+static struct dentry *vc_mem_debugfs_entry;
-+#endif
-+
-+/*
-+ * Videocore memory addresses and size
-+ *
-+ * Drivers that wish to know the videocore memory addresses and sizes should
-+ * use these variables instead of the MM_IO_BASE and MM_ADDR_IO defines in
-+ * headers. This allows the other drivers to not be tied down to a a certain
-+ * address/size at compile time.
-+ *
-+ * In the future, the goal is to have the videocore memory virtual address and
-+ * size be calculated at boot time rather than at compile time. The decision of
-+ * where the videocore memory resides and its size would be in the hands of the
-+ * 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;
-+
-+EXPORT_SYMBOL(mm_vc_mem_phys_addr);
-+EXPORT_SYMBOL(mm_vc_mem_size);
-+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 int
-+vc_mem_open(struct inode *inode, struct file *file)
-+{
-+ (void) inode;
-+ (void) file;
-+
-+ 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;
-+
-+ 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)
-+{
-+ int rc = 0;
-+
-+ (void) cmd;
-+ (void) arg;
-+
-+ pr_debug("%s: called file = 0x%p\n", __func__, file);
-+
-+ switch (cmd) {
-+ 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);
-+
-+ if (copy_to_user((void *) arg, &mm_vc_mem_phys_addr,
-+ sizeof (mm_vc_mem_phys_addr)) != 0) {
-+ rc = -EFAULT;
-+ }
-+ break;
-+ }
-+ case VC_MEM_IOC_MEM_SIZE:
-+ {
-+ // Get the videocore memory size first
-+ vc_mem_get_size();
-+
-+ pr_debug("%s: VC_MEM_IOC_MEM_SIZE=%u\n", __func__,
-+ mm_vc_mem_size);
-+
-+ if (copy_to_user((void *) arg, &mm_vc_mem_size,
-+ sizeof (mm_vc_mem_size)) != 0) {
-+ rc = -EFAULT;
-+ }
-+ break;
-+ }
-+ case VC_MEM_IOC_MEM_BASE:
-+ {
-+ // Get the videocore memory base
-+ vc_mem_get_base();
-+
-+ pr_debug("%s: VC_MEM_IOC_MEM_BASE=%u\n", __func__,
-+ mm_vc_mem_base);
-+
-+ if (copy_to_user((void *) arg, &mm_vc_mem_base,
-+ sizeof (mm_vc_mem_base)) != 0) {
-+ rc = -EFAULT;
-+ }
-+ break;
-+ }
-+ case VC_MEM_IOC_MEM_LOAD:
-+ {
-+ // Get the videocore memory base
-+ vc_mem_get_base();
-+
-+ pr_debug("%s: VC_MEM_IOC_MEM_LOAD=%u\n", __func__,
-+ mm_vc_mem_base);
-+
-+ if (copy_to_user((void *) arg, &mm_vc_mem_base,
-+ sizeof (mm_vc_mem_base)) != 0) {
-+ rc = -EFAULT;
-+ }
-+ break;
-+ }
-+ default:
-+ {
-+ return -ENOTTY;
-+ }
-+ }
-+ pr_debug("%s: file = 0x%p returning %d\n", __func__, file, rc);
-+
-+ return rc;
-+}
-+
-+/****************************************************************************
-+*
-+* vc_mem_mmap
-+*
-+***************************************************************************/
-+
-+static int
-+vc_mem_mmap(struct file *filp, struct vm_area_struct *vma)
-+{
-+ int rc = 0;
-+ unsigned long length = vma->vm_end - vma->vm_start;
-+ 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);
-+
-+ 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
-+ 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) {
-+ pr_err("%s: remap_pfn_range failed (rc=%d)\n", __func__, rc);
-+ }
-+
-+ return rc;
-+}
-+
-+/****************************************************************************
-+*
-+* File Operations for the driver.
-+*
-+***************************************************************************/
-+
-+static const struct file_operations vc_mem_fops = {
-+ .owner = THIS_MODULE,
-+ .open = vc_mem_open,
-+ .release = vc_mem_release,
-+ .unlocked_ioctl = vc_mem_ioctl,
-+ .mmap = vc_mem_mmap,
-+};
-+
-+#ifdef CONFIG_DEBUG_FS
-+static void vc_mem_debugfs_deinit(void)
-+{
-+ debugfs_remove_recursive(vc_mem_debugfs_entry);
-+ vc_mem_debugfs_entry = NULL;
-+}
-+
-+
-+static int vc_mem_debugfs_init(
-+ struct device *dev)
-+{
-+ vc_mem_debugfs_entry = debugfs_create_dir(DRIVER_NAME, NULL);
-+ if (!vc_mem_debugfs_entry) {
-+ dev_warn(dev, "could not create debugfs entry\n");
-+ return -EFAULT;
-+ }
-+
-+ if (!debugfs_create_x32("vc_mem_phys_addr",
-+ 0444,
-+ vc_mem_debugfs_entry,
-+ (u32 *)&mm_vc_mem_phys_addr)) {
-+ dev_warn(dev, "%s:could not create vc_mem_phys entry\n",
-+ __func__);
-+ goto fail;
-+ }
-+
-+ if (!debugfs_create_x32("vc_mem_size",
-+ 0444,
-+ vc_mem_debugfs_entry,
-+ (u32 *)&mm_vc_mem_size)) {
-+ dev_warn(dev, "%s:could not create vc_mem_size entry\n",
-+ __func__);
-+ goto fail;
-+ }
-+
-+ if (!debugfs_create_x32("vc_mem_base",
-+ 0444,
-+ vc_mem_debugfs_entry,
-+ (u32 *)&mm_vc_mem_base)) {
-+ dev_warn(dev, "%s:could not create vc_mem_base entry\n",
-+ __func__);
-+ goto fail;
-+ }
-+
-+ return 0;
-+
-+fail:
-+ vc_mem_debugfs_deinit();
-+ return -EFAULT;
-+}
-+
-+#endif /* CONFIG_DEBUG_FS */
-+
-+
-+/****************************************************************************
-+*
-+* vc_mem_init
-+*
-+***************************************************************************/
-+
-+static int __init
-+vc_mem_init(void)
-+{
-+ int rc = -EFAULT;
-+ struct device *dev;
-+
-+ pr_debug("%s: called\n", __func__);
-+
-+ mm_vc_mem_phys_addr = phys_addr;
-+ mm_vc_mem_size = mem_size;
-+ mm_vc_mem_base = mem_base;
-+
-+ 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));
-+
-+ if ((rc = alloc_chrdev_region(&vc_mem_devnum, 0, 1, DRIVER_NAME)) < 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) {
-+ pr_err("%s: cdev_add failed (rc=%d)\n", __func__, rc);
-+ goto out_unregister;
-+ }
-+
-+ vc_mem_class = class_create(THIS_MODULE, DRIVER_NAME);
-+ if (IS_ERR(vc_mem_class)) {
-+ rc = PTR_ERR(vc_mem_class);
-+ pr_err("%s: class_create failed (rc=%d)\n", __func__, rc);
-+ goto out_cdev_del;
-+ }
-+
-+ dev = device_create(vc_mem_class, NULL, vc_mem_devnum, NULL,
-+ DRIVER_NAME);
-+ if (IS_ERR(dev)) {
-+ rc = PTR_ERR(dev);
-+ pr_err("%s: device_create failed (rc=%d)\n", __func__, rc);
-+ goto out_class_destroy;
-+ }
-+
-+#ifdef CONFIG_DEBUG_FS
-+ /* don't fail if the debug entries cannot be created */
-+ vc_mem_debugfs_init(dev);
-+#endif
-+
-+ vc_mem_inited = 1;
-+ return 0;
-+
-+ device_destroy(vc_mem_class, vc_mem_devnum);
-+
-+ out_class_destroy:
-+ class_destroy(vc_mem_class);
-+ vc_mem_class = NULL;
-+
-+ out_cdev_del:
-+ cdev_del(&vc_mem_cdev);
-+
-+ out_unregister:
-+ unregister_chrdev_region(vc_mem_devnum, 1);
-+
-+ out_err:
-+ return -1;
-+}
-+
-+/****************************************************************************
-+*
-+* vc_mem_exit
-+*
-+***************************************************************************/
-+
-+static void __exit
-+vc_mem_exit(void)
-+{
-+ pr_debug("%s: called\n", __func__);
-+
-+ if (vc_mem_inited) {
-+#if CONFIG_DEBUG_FS
-+ vc_mem_debugfs_deinit();
-+#endif
-+ device_destroy(vc_mem_class, vc_mem_devnum);
-+ class_destroy(vc_mem_class);
-+ cdev_del(&vc_mem_cdev);
-+ unregister_chrdev_region(vc_mem_devnum, 1);
-+ }
-+}
-+
-+module_init(vc_mem_init);
-+module_exit(vc_mem_exit);
-+MODULE_LICENSE("GPL");
-+MODULE_AUTHOR("Broadcom Corporation");
-+
-+module_param(phys_addr, uint, 0644);
-+module_param(mem_size, uint, 0644);
-+module_param(mem_base, uint, 0644);
---- /dev/null
-+++ b/include/linux/broadcom/vc_mem.h
-@@ -0,0 +1,35 @@
-+/*****************************************************************************
-+* 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
-+
-+#include <linux/ioctl.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 )
-+
-+#if defined( __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 );
-+#endif
-+
-+#endif /* _VC_MEM_H */
projects / openwrt / staging / dedeckeh.git / blobdiff