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vc_mem: Add vc_mem driver for querying firmware memory addresses
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>
This commit is contained in:
popcornmix
@@ -7,9 +7,19 @@ menuconfig BRCM_CHAR_DRIVERS
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help
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Broadcom's char drivers
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if BRCM_CHAR_DRIVERS
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config BCM_VC_CMA
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bool "Videocore CMA"
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depends on CMA && BRCM_CHAR_DRIVERS && BCM2708_VCHIQ
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depends on CMA && BCM2708_VCHIQ
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default n
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help
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Helper for videocore CMA access.
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config BCM2708_VCMEM
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bool "Videocore Memory"
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default y
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help
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Helper for videocore memory access and total size allocation.
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endif
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@@ -1 +1,2 @@
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obj-$(CONFIG_BCM_VC_CMA) += vc_cma/
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obj-$(CONFIG_BCM2708_VCMEM) += vc_mem.o
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422
drivers/char/broadcom/vc_mem.c
Normal file
422
drivers/char/broadcom/vc_mem.c
Normal file
@@ -0,0 +1,422 @@
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/*****************************************************************************
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* Copyright 2010 - 2011 Broadcom Corporation. All rights reserved.
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*
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* Unless you and Broadcom execute a separate written software license
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* agreement governing use of this software, this software is licensed to you
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* under the terms of the GNU General Public License version 2, available at
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* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
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*
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* Notwithstanding the above, under no circumstances may you combine this
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* software in any way with any other Broadcom software provided under a
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* license other than the GPL, without Broadcom's express prior written
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* consent.
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*****************************************************************************/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/device.h>
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#include <linux/cdev.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/debugfs.h>
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#include <asm/uaccess.h>
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#include <linux/dma-mapping.h>
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#include <linux/broadcom/vc_mem.h>
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#define DRIVER_NAME "vc-mem"
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// Device (/dev) related variables
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static dev_t vc_mem_devnum = 0;
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static struct class *vc_mem_class = NULL;
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static struct cdev vc_mem_cdev;
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static int vc_mem_inited = 0;
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#ifdef CONFIG_DEBUG_FS
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static struct dentry *vc_mem_debugfs_entry;
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#endif
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/*
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* Videocore memory addresses and size
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*
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* Drivers that wish to know the videocore memory addresses and sizes should
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* use these variables instead of the MM_IO_BASE and MM_ADDR_IO defines in
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* headers. This allows the other drivers to not be tied down to a a certain
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* address/size at compile time.
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*
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* In the future, the goal is to have the videocore memory virtual address and
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* size be calculated at boot time rather than at compile time. The decision of
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* where the videocore memory resides and its size would be in the hands of the
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* bootloader (and/or kernel). When that happens, the values of these variables
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* would be calculated and assigned in the init function.
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*/
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// in the 2835 VC in mapped above ARM, but ARM has full access to VC space
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unsigned long mm_vc_mem_phys_addr = 0x00000000;
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unsigned int mm_vc_mem_size = 0;
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unsigned int mm_vc_mem_base = 0;
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EXPORT_SYMBOL(mm_vc_mem_phys_addr);
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EXPORT_SYMBOL(mm_vc_mem_size);
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EXPORT_SYMBOL(mm_vc_mem_base);
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static uint phys_addr = 0;
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static uint mem_size = 0;
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static uint mem_base = 0;
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/****************************************************************************
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*
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* vc_mem_open
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*
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***************************************************************************/
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static int
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vc_mem_open(struct inode *inode, struct file *file)
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{
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(void) inode;
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(void) file;
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pr_debug("%s: called file = 0x%p\n", __func__, file);
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return 0;
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}
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/****************************************************************************
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*
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* vc_mem_release
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*
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***************************************************************************/
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static int
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vc_mem_release(struct inode *inode, struct file *file)
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{
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(void) inode;
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(void) file;
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pr_debug("%s: called file = 0x%p\n", __func__, file);
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return 0;
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}
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/****************************************************************************
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*
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* vc_mem_get_size
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*
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***************************************************************************/
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static void
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vc_mem_get_size(void)
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{
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}
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/****************************************************************************
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*
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* vc_mem_get_base
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*
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***************************************************************************/
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static void
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vc_mem_get_base(void)
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{
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}
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/****************************************************************************
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*
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* vc_mem_get_current_size
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*
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***************************************************************************/
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int
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vc_mem_get_current_size(void)
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{
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return mm_vc_mem_size;
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}
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EXPORT_SYMBOL_GPL(vc_mem_get_current_size);
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/****************************************************************************
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*
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* vc_mem_ioctl
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*
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***************************************************************************/
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static long
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vc_mem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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int rc = 0;
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(void) cmd;
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(void) arg;
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pr_debug("%s: called file = 0x%p\n", __func__, file);
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switch (cmd) {
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case VC_MEM_IOC_MEM_PHYS_ADDR:
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{
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pr_debug("%s: VC_MEM_IOC_MEM_PHYS_ADDR=0x%p\n",
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__func__, (void *) mm_vc_mem_phys_addr);
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if (copy_to_user((void *) arg, &mm_vc_mem_phys_addr,
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sizeof (mm_vc_mem_phys_addr)) != 0) {
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rc = -EFAULT;
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}
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break;
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}
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case VC_MEM_IOC_MEM_SIZE:
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{
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// Get the videocore memory size first
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vc_mem_get_size();
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pr_debug("%s: VC_MEM_IOC_MEM_SIZE=%u\n", __func__,
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mm_vc_mem_size);
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if (copy_to_user((void *) arg, &mm_vc_mem_size,
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sizeof (mm_vc_mem_size)) != 0) {
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rc = -EFAULT;
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}
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break;
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}
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case VC_MEM_IOC_MEM_BASE:
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{
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// Get the videocore memory base
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vc_mem_get_base();
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pr_debug("%s: VC_MEM_IOC_MEM_BASE=%u\n", __func__,
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mm_vc_mem_base);
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if (copy_to_user((void *) arg, &mm_vc_mem_base,
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sizeof (mm_vc_mem_base)) != 0) {
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rc = -EFAULT;
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}
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break;
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}
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case VC_MEM_IOC_MEM_LOAD:
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{
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// Get the videocore memory base
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vc_mem_get_base();
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pr_debug("%s: VC_MEM_IOC_MEM_LOAD=%u\n", __func__,
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mm_vc_mem_base);
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if (copy_to_user((void *) arg, &mm_vc_mem_base,
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sizeof (mm_vc_mem_base)) != 0) {
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rc = -EFAULT;
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}
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break;
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}
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default:
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{
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return -ENOTTY;
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}
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}
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pr_debug("%s: file = 0x%p returning %d\n", __func__, file, rc);
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return rc;
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}
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/****************************************************************************
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*
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* vc_mem_mmap
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*
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***************************************************************************/
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static int
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vc_mem_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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int rc = 0;
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unsigned long length = vma->vm_end - vma->vm_start;
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unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
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pr_debug("%s: vm_start = 0x%08lx vm_end = 0x%08lx vm_pgoff = 0x%08lx\n",
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__func__, (long) vma->vm_start, (long) vma->vm_end,
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(long) vma->vm_pgoff);
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if (offset + length > mm_vc_mem_size) {
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pr_err("%s: length %ld is too big\n", __func__, length);
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return -EINVAL;
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}
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// Do not cache the memory map
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vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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rc = remap_pfn_range(vma, vma->vm_start,
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(mm_vc_mem_phys_addr >> PAGE_SHIFT) +
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vma->vm_pgoff, length, vma->vm_page_prot);
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if (rc != 0) {
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pr_err("%s: remap_pfn_range failed (rc=%d)\n", __func__, rc);
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}
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return rc;
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}
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/****************************************************************************
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*
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* File Operations for the driver.
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*
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***************************************************************************/
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static const struct file_operations vc_mem_fops = {
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.owner = THIS_MODULE,
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.open = vc_mem_open,
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.release = vc_mem_release,
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.unlocked_ioctl = vc_mem_ioctl,
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.mmap = vc_mem_mmap,
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};
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#ifdef CONFIG_DEBUG_FS
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static void vc_mem_debugfs_deinit(void)
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{
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debugfs_remove_recursive(vc_mem_debugfs_entry);
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vc_mem_debugfs_entry = NULL;
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}
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static int vc_mem_debugfs_init(
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struct device *dev)
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{
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vc_mem_debugfs_entry = debugfs_create_dir(DRIVER_NAME, NULL);
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if (!vc_mem_debugfs_entry) {
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dev_warn(dev, "could not create debugfs entry\n");
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return -EFAULT;
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}
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if (!debugfs_create_x32("vc_mem_phys_addr",
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0444,
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vc_mem_debugfs_entry,
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(u32 *)&mm_vc_mem_phys_addr)) {
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dev_warn(dev, "%s:could not create vc_mem_phys entry\n",
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__func__);
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goto fail;
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}
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if (!debugfs_create_x32("vc_mem_size",
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0444,
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vc_mem_debugfs_entry,
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(u32 *)&mm_vc_mem_size)) {
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dev_warn(dev, "%s:could not create vc_mem_size entry\n",
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__func__);
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goto fail;
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}
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if (!debugfs_create_x32("vc_mem_base",
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0444,
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vc_mem_debugfs_entry,
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(u32 *)&mm_vc_mem_base)) {
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dev_warn(dev, "%s:could not create vc_mem_base entry\n",
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__func__);
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goto fail;
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}
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return 0;
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fail:
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vc_mem_debugfs_deinit();
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return -EFAULT;
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}
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#endif /* CONFIG_DEBUG_FS */
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/****************************************************************************
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*
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* vc_mem_init
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*
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***************************************************************************/
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static int __init
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vc_mem_init(void)
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{
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int rc = -EFAULT;
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struct device *dev;
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pr_debug("%s: called\n", __func__);
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mm_vc_mem_phys_addr = phys_addr;
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mm_vc_mem_size = mem_size;
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mm_vc_mem_base = mem_base;
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vc_mem_get_size();
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pr_info("vc-mem: phys_addr:0x%08lx mem_base=0x%08x mem_size:0x%08x(%u MiB)\n",
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mm_vc_mem_phys_addr, mm_vc_mem_base, mm_vc_mem_size, mm_vc_mem_size / (1024 * 1024));
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if ((rc = alloc_chrdev_region(&vc_mem_devnum, 0, 1, DRIVER_NAME)) < 0) {
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pr_err("%s: alloc_chrdev_region failed (rc=%d)\n",
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__func__, rc);
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goto out_err;
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}
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cdev_init(&vc_mem_cdev, &vc_mem_fops);
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if ((rc = cdev_add(&vc_mem_cdev, vc_mem_devnum, 1)) != 0) {
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pr_err("%s: cdev_add failed (rc=%d)\n", __func__, rc);
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goto out_unregister;
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}
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vc_mem_class = class_create(THIS_MODULE, DRIVER_NAME);
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if (IS_ERR(vc_mem_class)) {
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rc = PTR_ERR(vc_mem_class);
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pr_err("%s: class_create failed (rc=%d)\n", __func__, rc);
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goto out_cdev_del;
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}
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dev = device_create(vc_mem_class, NULL, vc_mem_devnum, NULL,
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DRIVER_NAME);
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if (IS_ERR(dev)) {
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rc = PTR_ERR(dev);
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pr_err("%s: device_create failed (rc=%d)\n", __func__, rc);
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goto out_class_destroy;
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}
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#ifdef CONFIG_DEBUG_FS
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/* don't fail if the debug entries cannot be created */
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vc_mem_debugfs_init(dev);
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#endif
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vc_mem_inited = 1;
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return 0;
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device_destroy(vc_mem_class, vc_mem_devnum);
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out_class_destroy:
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class_destroy(vc_mem_class);
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vc_mem_class = NULL;
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out_cdev_del:
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cdev_del(&vc_mem_cdev);
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out_unregister:
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unregister_chrdev_region(vc_mem_devnum, 1);
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out_err:
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return -1;
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}
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/****************************************************************************
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*
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* vc_mem_exit
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*
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***************************************************************************/
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static void __exit
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vc_mem_exit(void)
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{
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pr_debug("%s: called\n", __func__);
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if (vc_mem_inited) {
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#if CONFIG_DEBUG_FS
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vc_mem_debugfs_deinit();
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#endif
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device_destroy(vc_mem_class, vc_mem_devnum);
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class_destroy(vc_mem_class);
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cdev_del(&vc_mem_cdev);
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unregister_chrdev_region(vc_mem_devnum, 1);
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}
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}
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module_init(vc_mem_init);
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module_exit(vc_mem_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Broadcom Corporation");
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module_param(phys_addr, uint, 0644);
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module_param(mem_size, uint, 0644);
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module_param(mem_base, uint, 0644);
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35
include/linux/broadcom/vc_mem.h
Normal file
35
include/linux/broadcom/vc_mem.h
Normal file
@@ -0,0 +1,35 @@
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/*****************************************************************************
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||||
* 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.
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*****************************************************************************/
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#ifndef _VC_MEM_H
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#define _VC_MEM_H
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#include <linux/ioctl.h>
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#define VC_MEM_IOC_MAGIC 'v'
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#define VC_MEM_IOC_MEM_PHYS_ADDR _IOR( VC_MEM_IOC_MAGIC, 0, unsigned long )
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#define VC_MEM_IOC_MEM_SIZE _IOR( VC_MEM_IOC_MAGIC, 1, unsigned int )
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#define VC_MEM_IOC_MEM_BASE _IOR( VC_MEM_IOC_MAGIC, 2, unsigned int )
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#define VC_MEM_IOC_MEM_LOAD _IOR( VC_MEM_IOC_MAGIC, 3, unsigned int )
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#if defined( __KERNEL__ )
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#define VC_MEM_TO_ARM_ADDR_MASK 0x3FFFFFFF
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extern unsigned long mm_vc_mem_phys_addr;
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extern unsigned int mm_vc_mem_size;
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extern int vc_mem_get_current_size( void );
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#endif
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#endif /* _VC_MEM_H */
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Reference in New Issue
Block a user