489 lines
12 KiB
Diff
489 lines
12 KiB
Diff
From 156d50d2fb05f132d53927cbf9fad3c9c37e8937 Mon Sep 17 00:00:00 2001
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From: popcornmix <popcornmix@gmail.com>
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Date: Fri, 28 Oct 2016 15:36:43 +0100
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Subject: [PATCH] vc_mem: Add vc_mem driver for querying firmware
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memory addresses
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Signed-off-by: popcornmix <popcornmix@gmail.com>
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BCM270x: Move vc_mem
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Make the vc_mem module available for ARCH_BCM2835 by moving it.
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Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
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char: vc_mem: Fix up compat ioctls for 64bit kernel
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compat_ioctl wasn't defined, so 32bit user/64bit kernel
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always failed.
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VC_MEM_IOC_MEM_PHYS_ADDR was defined with parameter size
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unsigned long, so the ioctl cmd changes between sizes.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
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char: vc_mem: Fix all coding style issues.
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Cleans up all checkpatch errors in vc_mem.c and vc_mem.h
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No functional change to the code.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
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---
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drivers/char/broadcom/Kconfig | 18 ++
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drivers/char/broadcom/Makefile | 1 +
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drivers/char/broadcom/vc_mem.c | 375 ++++++++++++++++++++++++++++++++
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include/linux/broadcom/vc_mem.h | 39 ++++
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4 files changed, 433 insertions(+)
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create mode 100644 drivers/char/broadcom/Kconfig
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create mode 100644 drivers/char/broadcom/Makefile
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create mode 100644 drivers/char/broadcom/vc_mem.c
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create mode 100644 include/linux/broadcom/vc_mem.h
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--- /dev/null
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+++ b/drivers/char/broadcom/Kconfig
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@@ -0,0 +1,18 @@
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+#
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+# Broadcom char driver config
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+#
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+
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+menuconfig BRCM_CHAR_DRIVERS
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+ bool "Broadcom Char Drivers"
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+ help
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+ Broadcom's char drivers
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+
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+if BRCM_CHAR_DRIVERS
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+
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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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+
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+endif
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--- /dev/null
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+++ b/drivers/char/broadcom/Makefile
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@@ -0,0 +1 @@
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+obj-$(CONFIG_BCM2708_VCMEM) += vc_mem.o
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--- /dev/null
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+++ b/drivers/char/broadcom/vc_mem.c
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@@ -0,0 +1,375 @@
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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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+
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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 <linux/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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+
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+#define DRIVER_NAME "vc-mem"
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+
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+/* Device (/dev) related variables */
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+static dev_t vc_mem_devnum;
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+static struct class *vc_mem_class;
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+static struct cdev vc_mem_cdev;
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+static int vc_mem_inited;
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+
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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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+/*
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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;
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+EXPORT_SYMBOL(mm_vc_mem_phys_addr);
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+unsigned int mm_vc_mem_size;
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+EXPORT_SYMBOL(mm_vc_mem_size);
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+unsigned int mm_vc_mem_base;
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+EXPORT_SYMBOL(mm_vc_mem_base);
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+
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+static uint phys_addr;
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+static uint mem_size;
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+static uint mem_base;
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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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+
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+ pr_debug("%s: called file = 0x%p\n", __func__, file);
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+
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+ return 0;
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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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+
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+ pr_debug("%s: called file = 0x%p\n", __func__, file);
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+
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+ return 0;
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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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+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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+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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+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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+
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+ (void) cmd;
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+ (void) arg;
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+
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+ pr_debug("%s: called file = 0x%p, cmd %08x\n", __func__, file, cmd);
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+
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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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+
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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))) {
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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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+
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+ pr_debug("%s: VC_MEM_IOC_MEM_SIZE=%x\n", __func__,
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+ mm_vc_mem_size);
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+
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+ if (copy_to_user((void *)arg, &mm_vc_mem_size,
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+ sizeof(mm_vc_mem_size))) {
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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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+
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+ pr_debug("%s: VC_MEM_IOC_MEM_BASE=%x\n", __func__,
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+ mm_vc_mem_base);
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+
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+ if (copy_to_user((void *)arg, &mm_vc_mem_base,
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+ sizeof(mm_vc_mem_base))) {
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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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+
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+ pr_debug("%s: VC_MEM_IOC_MEM_LOAD=%x\n", __func__,
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+ mm_vc_mem_base);
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+
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+ if (copy_to_user((void *)arg, &mm_vc_mem_base,
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+ sizeof(mm_vc_mem_base))) {
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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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+
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+ return rc;
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+}
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+
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+#ifdef CONFIG_COMPAT
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+static long
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+vc_mem_compat_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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+
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+ switch (cmd) {
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+ case VC_MEM_IOC_MEM_PHYS_ADDR32:
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+ pr_debug("%s: VC_MEM_IOC_MEM_PHYS_ADDR32=0x%p\n",
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+ __func__, (void *)mm_vc_mem_phys_addr);
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+
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+ /* This isn't correct, but will cover us for now as
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+ * VideoCore is 32bit only.
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+ */
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+ if (copy_to_user((void *)arg, &mm_vc_mem_phys_addr,
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+ sizeof(compat_ulong_t)))
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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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+ rc = vc_mem_ioctl(file, cmd, arg);
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+ break;
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+ }
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+
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+ return rc;
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+}
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+#endif
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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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+
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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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+
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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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+
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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)
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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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+/* File Operations for the driver. */
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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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+#ifdef CONFIG_COMPAT
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+ .compat_ioctl = vc_mem_compat_ioctl,
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+#endif
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+ .mmap = vc_mem_mmap,
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+};
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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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+
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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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+
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+ 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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+ 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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+ 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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+
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+ return 0;
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+}
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+
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+#endif /* CONFIG_DEBUG_FS */
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+
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+/* Module load/unload functions */
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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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+
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+ pr_debug("%s: called\n", __func__);
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+
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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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+
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+ vc_mem_get_size();
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+
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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,
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+ mm_vc_mem_size / (1024 * 1024));
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+
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+ rc = alloc_chrdev_region(&vc_mem_devnum, 0, 1, DRIVER_NAME);
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+ if (rc < 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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+
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+ cdev_init(&vc_mem_cdev, &vc_mem_fops);
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+ rc = cdev_add(&vc_mem_cdev, vc_mem_devnum, 1);
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+ if (rc) {
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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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+
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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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+
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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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+
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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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+
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+ vc_mem_inited = 1;
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+ return 0;
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+
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+ device_destroy(vc_mem_class, vc_mem_devnum);
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+
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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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+
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+out_cdev_del:
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+ cdev_del(&vc_mem_cdev);
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+
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+out_unregister:
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+ unregister_chrdev_region(vc_mem_devnum, 1);
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+
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+out_err:
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+ return -1;
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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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+
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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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+
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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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+
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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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--- /dev/null
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+++ b/include/linux/broadcom/vc_mem.h
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@@ -0,0 +1,39 @@
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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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+
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+#ifndef _VC_MEM_H
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+#define _VC_MEM_H
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+
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+#include <linux/ioctl.h>
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+
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+#define VC_MEM_IOC_MAGIC 'v'
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+
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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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+
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+#ifdef __KERNEL__
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+#define VC_MEM_TO_ARM_ADDR_MASK 0x3FFFFFFF
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+
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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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+
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+#ifdef CONFIG_COMPAT
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+#define VC_MEM_IOC_MEM_PHYS_ADDR32 _IOR(VC_MEM_IOC_MAGIC, 0, compat_ulong_t)
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+#endif
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+
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+#endif /* _VC_MEM_H */
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