mirror of https://github.com/hak5/openwrt.git
321 lines
9.5 KiB
Diff
321 lines
9.5 KiB
Diff
From 0be0d6439128366a8d2ac0afaf88f19209171e51 Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.org>
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Date: Thu, 9 May 2019 14:30:37 +0100
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Subject: [PATCH] drivers: char: add chardev for mmap'ing Argon control
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registers
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Based on the gpiomem driver, allow mapping of the decoder register
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spaces such that userspace can access control/status registers.
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This driver is intended for use with a custom ffmpeg backend accelerator
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prior to a v4l2 driver being written.
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.org>
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---
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drivers/char/broadcom/Kconfig | 8 +
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drivers/char/broadcom/Makefile | 1 +
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drivers/char/broadcom/argon-mem.c | 277 ++++++++++++++++++++++++++++++
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3 files changed, 286 insertions(+)
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create mode 100644 drivers/char/broadcom/argon-mem.c
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--- a/drivers/char/broadcom/Kconfig
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+++ b/drivers/char/broadcom/Kconfig
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@@ -49,3 +49,11 @@ config BCM2835_SMI_DEV
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This driver provides a character device interface (ioctl + read/write) to
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Broadcom's Secondary Memory interface. The low-level functionality is provided
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by the SMI driver itself.
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+
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+config ARGON_MEM
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+ tristate "Character device driver for the Argon decoder hardware"
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+ default n
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+ help
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+ This driver provides a character device interface for memory-map operations
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+ so userspace tools can access the control and status registers of the Argon
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+ video decoder hardware.
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--- a/drivers/char/broadcom/Makefile
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+++ b/drivers/char/broadcom/Makefile
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@@ -4,3 +4,4 @@ obj-$(CONFIG_BCM_VC_SM) += vc_sm
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obj-$(CONFIG_BCM2835_DEVGPIOMEM)+= bcm2835-gpiomem.o
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obj-$(CONFIG_BCM2835_SMI_DEV) += bcm2835_smi_dev.o
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+obj-$(CONFIG_ARGON_MEM) += argon-mem.o
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--- /dev/null
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+++ b/drivers/char/broadcom/argon-mem.c
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@@ -0,0 +1,277 @@
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+/**
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+ * argon-mem.c - character device access to the Argon decoder registers
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+ *
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+ * Based on bcm2835-gpiomem.c. Provides IO memory access to the decoder
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+ * register blocks such that ffmpeg plugins can access the hardware.
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+ *
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+ * Jonathan Bell <jonathan@raspberrypi.org>
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+ * Copyright (c) 2019, Raspberry Pi (Trading) Ltd.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions, and the following disclaimer,
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+ * without modification.
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+ * 2. Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ * 3. The names of the above-listed copyright holders may not be used
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+ * to endorse or promote products derived from this software without
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+ * specific prior written permission.
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+ *
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+ * ALTERNATIVELY, this software may be distributed under the terms of the
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+ * GNU General Public License ("GPL") version 2, as published by the Free
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+ * Software Foundation.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/of.h>
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+#include <linux/of_device.h>
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+#include <linux/platform_device.h>
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+#include <linux/mm.h>
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+#include <linux/slab.h>
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+#include <linux/cdev.h>
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+#include <linux/pagemap.h>
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+#include <linux/io.h>
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+
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+#define DRIVER_NAME "argon-mem"
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+#define DEVICE_MINOR 0
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+
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+struct argon_mem_priv {
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+ dev_t devid;
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+ struct class *class;
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+ struct cdev argon_mem_cdev;
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+ unsigned long regs_phys;
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+ unsigned long mem_window_len;
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+ struct device *dev;
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+ const char *name;
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+};
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+
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+static int argon_mem_open(struct inode *inode, struct file *file)
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+{
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+ int dev = iminor(inode);
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+ int ret = 0;
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+ struct argon_mem_priv *priv;
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+ if (dev != DEVICE_MINOR)
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+ ret = -ENXIO;
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+
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+ priv = container_of(inode->i_cdev, struct argon_mem_priv,
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+ argon_mem_cdev);
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+ if (!priv)
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+ return -EINVAL;
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+ file->private_data = priv;
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+ return ret;
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+}
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+
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+static int argon_mem_release(struct inode *inode, struct file *file)
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+{
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+ int dev = iminor(inode);
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+ int ret = 0;
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+
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+ if (dev != DEVICE_MINOR)
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+ ret = -ENXIO;
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+
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+ return ret;
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+}
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+
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+static const struct vm_operations_struct argon_mem_vm_ops = {
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+#ifdef CONFIG_HAVE_IOREMAP_PROT
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+ .access = generic_access_phys
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+#endif
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+};
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+
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+static int argon_mem_mmap(struct file *file, struct vm_area_struct *vma)
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+{
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+ struct argon_mem_priv *priv;
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+ unsigned long pages;
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+
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+ priv = file->private_data;
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+ pages = priv->regs_phys >> PAGE_SHIFT;
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+ /*
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+ * The address decode is far larger than the actual number of registers.
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+ * Just map the whole lot in.
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+ */
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+ vma->vm_page_prot = phys_mem_access_prot(file, pages,
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+ priv->mem_window_len,
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+ vma->vm_page_prot);
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+ vma->vm_ops = &argon_mem_vm_ops;
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+ if (remap_pfn_range(vma, vma->vm_start,
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+ pages,
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+ priv->mem_window_len,
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+ vma->vm_page_prot)) {
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+ return -EAGAIN;
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+ }
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+ return 0;
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+}
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+
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+static const struct file_operations
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+argon_mem_fops = {
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+ .owner = THIS_MODULE,
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+ .open = argon_mem_open,
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+ .release = argon_mem_release,
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+ .mmap = argon_mem_mmap,
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+};
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+
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+static const struct of_device_id argon_mem_of_match[];
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+static int argon_mem_probe(struct platform_device *pdev)
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+{
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+ int err;
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+ void *ptr_err;
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+ const struct of_device_id *id;
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+ struct device *dev = &pdev->dev;
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+ struct device *argon_mem_dev;
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+ struct resource *ioresource;
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+ struct argon_mem_priv *priv;
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+
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+
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+ /* Allocate buffers and instance data */
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+
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+ priv = kzalloc(sizeof(struct argon_mem_priv), GFP_KERNEL);
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+
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+ if (!priv) {
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+ err = -ENOMEM;
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+ goto failed_inst_alloc;
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+ }
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+ platform_set_drvdata(pdev, priv);
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+
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+ priv->dev = dev;
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+ id = of_match_device(argon_mem_of_match, dev);
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+ if (!id)
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+ return -EINVAL;
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+ priv->name = id->data;
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+
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+ ioresource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ if (ioresource) {
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+ priv->regs_phys = ioresource->start;
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+ priv->mem_window_len = ioresource->end - ioresource->start;
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+ } else {
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+ dev_err(priv->dev, "failed to get IO resource");
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+ err = -ENOENT;
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+ goto failed_get_resource;
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+ }
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+
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+ /* Create character device entries */
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+
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+ err = alloc_chrdev_region(&priv->devid,
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+ DEVICE_MINOR, 1, priv->name);
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+ if (err != 0) {
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+ dev_err(priv->dev, "unable to allocate device number");
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+ goto failed_alloc_chrdev;
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+ }
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+ cdev_init(&priv->argon_mem_cdev, &argon_mem_fops);
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+ priv->argon_mem_cdev.owner = THIS_MODULE;
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+ err = cdev_add(&priv->argon_mem_cdev, priv->devid, 1);
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+ if (err != 0) {
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+ dev_err(priv->dev, "unable to register device");
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+ goto failed_cdev_add;
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+ }
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+
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+ /* Create sysfs entries */
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+
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+ priv->class = class_create(THIS_MODULE, priv->name);
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+ ptr_err = priv->class;
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+ if (IS_ERR(ptr_err))
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+ goto failed_class_create;
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+
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+ argon_mem_dev = device_create(priv->class, NULL,
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+ priv->devid, NULL,
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+ priv->name);
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+ ptr_err = argon_mem_dev;
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+ if (IS_ERR(ptr_err))
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+ goto failed_device_create;
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+
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+ dev_info(priv->dev, "%s initialised: Registers at 0x%08lx length 0x%08lx",
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+ priv->name, priv->regs_phys, priv->mem_window_len);
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+
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+ return 0;
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+
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+failed_device_create:
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+ class_destroy(priv->class);
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+failed_class_create:
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+ cdev_del(&priv->argon_mem_cdev);
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+ err = PTR_ERR(ptr_err);
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+failed_cdev_add:
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+ unregister_chrdev_region(priv->devid, 1);
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+failed_alloc_chrdev:
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+failed_get_resource:
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+ kfree(priv);
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+failed_inst_alloc:
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+ dev_err(priv->dev, "could not load argon_mem");
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+ return err;
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+}
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+
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+static int argon_mem_remove(struct platform_device *pdev)
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+{
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+ struct device *dev = &pdev->dev;
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+ struct argon_mem_priv *priv = platform_get_drvdata(pdev);
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+
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+ device_destroy(priv->class, priv->devid);
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+ class_destroy(priv->class);
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+ cdev_del(&priv->argon_mem_cdev);
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+ unregister_chrdev_region(priv->devid, 1);
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+ kfree(priv);
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+
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+ dev_info(dev, "%s driver removed - OK", priv->name);
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+ return 0;
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+}
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+
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+static const char argon_hevc_name[] = "argon-hevcmem";
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+static const char argon_h264_name[] = "argon-h264mem";
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+static const char argon_vp9_name[] = "argon-vp9mem";
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+static const char argon_intc_name[] = "argon-intcmem";
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+
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+static const struct of_device_id argon_mem_of_match[] = {
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+ {
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+ .compatible = "raspberrypi,argon-hevc-decoder",
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+ .data = &argon_hevc_name,
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+ },
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+ {
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+ .compatible = "raspberrypi,argon-h264-decoder",
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+ .data = &argon_h264_name,
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+ },
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+ {
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+ .compatible = "raspberrypi,argon-vp9-decoder",
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+ .data = &argon_vp9_name,
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+ },
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+ /* The "intc" is included as this block of hardware contains the
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+ * "frame done" status flags.
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+ */
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+ {
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+ .compatible = "raspberrypi,argon-local-intc",
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+ .data = &argon_intc_name,
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+ },
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+ { /* sentinel */ },
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+};
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+
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+MODULE_DEVICE_TABLE(of, argon_mem_of_match);
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+
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+static struct platform_driver argon_mem_driver = {
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+ .probe = argon_mem_probe,
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+ .remove = argon_mem_remove,
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+ .driver = {
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+ .name = DRIVER_NAME,
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+ .owner = THIS_MODULE,
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+ .of_match_table = argon_mem_of_match,
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+ },
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+};
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+
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+module_platform_driver(argon_mem_driver);
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+
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+MODULE_ALIAS("platform:argon-mem");
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+MODULE_LICENSE("GPL");
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+MODULE_DESCRIPTION("Driver for accessing Argon decoder registers from userspace");
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+MODULE_AUTHOR("Jonathan Bell <jonathan@raspberrypi.org>");
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