diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0478-drivers-char-add-chardev-for-mmap-ing-Argon-control-.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0478-drivers-char-add-chardev-for-mmap-ing-Argon-control-.patch | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0478-drivers-char-add-chardev-for-mmap-ing-Argon-control-.patch b/target/linux/brcm2708/patches-4.19/950-0478-drivers-char-add-chardev-for-mmap-ing-Argon-control-.patch new file mode 100644 index 0000000000..fb358aa45f --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0478-drivers-char-add-chardev-for-mmap-ing-Argon-control-.patch @@ -0,0 +1,320 @@ +From 0be0d6439128366a8d2ac0afaf88f19209171e51 Mon Sep 17 00:00:00 2001 +From: Jonathan Bell <jonathan@raspberrypi.org> +Date: Thu, 9 May 2019 14:30:37 +0100 +Subject: [PATCH] drivers: char: add chardev for mmap'ing Argon control + registers + +Based on the gpiomem driver, allow mapping of the decoder register +spaces such that userspace can access control/status registers. +This driver is intended for use with a custom ffmpeg backend accelerator +prior to a v4l2 driver being written. + +Signed-off-by: Jonathan Bell <jonathan@raspberrypi.org> +--- + drivers/char/broadcom/Kconfig | 8 + + drivers/char/broadcom/Makefile | 1 + + drivers/char/broadcom/argon-mem.c | 277 ++++++++++++++++++++++++++++++ + 3 files changed, 286 insertions(+) + create mode 100644 drivers/char/broadcom/argon-mem.c + +--- a/drivers/char/broadcom/Kconfig ++++ b/drivers/char/broadcom/Kconfig +@@ -49,3 +49,11 @@ config BCM2835_SMI_DEV + This driver provides a character device interface (ioctl + read/write) to + Broadcom's Secondary Memory interface. The low-level functionality is provided + by the SMI driver itself. ++ ++config ARGON_MEM ++ tristate "Character device driver for the Argon decoder hardware" ++ default n ++ help ++ This driver provides a character device interface for memory-map operations ++ so userspace tools can access the control and status registers of the Argon ++ video decoder hardware. +--- a/drivers/char/broadcom/Makefile ++++ b/drivers/char/broadcom/Makefile +@@ -4,3 +4,4 @@ obj-$(CONFIG_BCM_VC_SM) += vc_sm + + obj-$(CONFIG_BCM2835_DEVGPIOMEM)+= bcm2835-gpiomem.o + obj-$(CONFIG_BCM2835_SMI_DEV) += bcm2835_smi_dev.o ++obj-$(CONFIG_ARGON_MEM) += argon-mem.o +--- /dev/null ++++ b/drivers/char/broadcom/argon-mem.c +@@ -0,0 +1,277 @@ ++/** ++ * argon-mem.c - character device access to the Argon decoder registers ++ * ++ * Based on bcm2835-gpiomem.c. Provides IO memory access to the decoder ++ * register blocks such that ffmpeg plugins can access the hardware. ++ * ++ * Jonathan Bell <jonathan@raspberrypi.org> ++ * Copyright (c) 2019, Raspberry Pi (Trading) Ltd. ++ * ++ * Redistribution and use in source and binary forms, with or without ++ * modification, are permitted provided that the following conditions ++ * are met: ++ * 1. Redistributions of source code must retain the above copyright ++ * notice, this list of conditions, and the following disclaimer, ++ * without modification. ++ * 2. Redistributions in binary form must reproduce the above copyright ++ * notice, this list of conditions and the following disclaimer in the ++ * documentation and/or other materials provided with the distribution. ++ * 3. The names of the above-listed copyright holders may not be used ++ * to endorse or promote products derived from this software without ++ * specific prior written permission. ++ * ++ * ALTERNATIVELY, this software may be distributed under the terms of the ++ * GNU General Public License ("GPL") version 2, as published by the Free ++ * Software Foundation. ++ * ++ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS ++ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, ++ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR ++ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR ++ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, ++ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, ++ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR ++ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ++ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING ++ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ++ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ++ */ ++ ++#include <linux/kernel.h> ++#include <linux/module.h> ++#include <linux/of.h> ++#include <linux/of_device.h> ++#include <linux/platform_device.h> ++#include <linux/mm.h> ++#include <linux/slab.h> ++#include <linux/cdev.h> ++#include <linux/pagemap.h> ++#include <linux/io.h> ++ ++#define DRIVER_NAME "argon-mem" ++#define DEVICE_MINOR 0 ++ ++struct argon_mem_priv { ++ dev_t devid; ++ struct class *class; ++ struct cdev argon_mem_cdev; ++ unsigned long regs_phys; ++ unsigned long mem_window_len; ++ struct device *dev; ++ const char *name; ++}; ++ ++static int argon_mem_open(struct inode *inode, struct file *file) ++{ ++ int dev = iminor(inode); ++ int ret = 0; ++ struct argon_mem_priv *priv; ++ if (dev != DEVICE_MINOR) ++ ret = -ENXIO; ++ ++ priv = container_of(inode->i_cdev, struct argon_mem_priv, ++ argon_mem_cdev); ++ if (!priv) ++ return -EINVAL; ++ file->private_data = priv; ++ return ret; ++} ++ ++static int argon_mem_release(struct inode *inode, struct file *file) ++{ ++ int dev = iminor(inode); ++ int ret = 0; ++ ++ if (dev != DEVICE_MINOR) ++ ret = -ENXIO; ++ ++ return ret; ++} ++ ++static const struct vm_operations_struct argon_mem_vm_ops = { ++#ifdef CONFIG_HAVE_IOREMAP_PROT ++ .access = generic_access_phys ++#endif ++}; ++ ++static int argon_mem_mmap(struct file *file, struct vm_area_struct *vma) ++{ ++ struct argon_mem_priv *priv; ++ unsigned long pages; ++ ++ priv = file->private_data; ++ pages = priv->regs_phys >> PAGE_SHIFT; ++ /* ++ * The address decode is far larger than the actual number of registers. ++ * Just map the whole lot in. ++ */ ++ vma->vm_page_prot = phys_mem_access_prot(file, pages, ++ priv->mem_window_len, ++ vma->vm_page_prot); ++ vma->vm_ops = &argon_mem_vm_ops; ++ if (remap_pfn_range(vma, vma->vm_start, ++ pages, ++ priv->mem_window_len, ++ vma->vm_page_prot)) { ++ return -EAGAIN; ++ } ++ return 0; ++} ++ ++static const struct file_operations ++argon_mem_fops = { ++ .owner = THIS_MODULE, ++ .open = argon_mem_open, ++ .release = argon_mem_release, ++ .mmap = argon_mem_mmap, ++}; ++ ++static const struct of_device_id argon_mem_of_match[]; ++static int argon_mem_probe(struct platform_device *pdev) ++{ ++ int err; ++ void *ptr_err; ++ const struct of_device_id *id; ++ struct device *dev = &pdev->dev; ++ struct device *argon_mem_dev; ++ struct resource *ioresource; ++ struct argon_mem_priv *priv; ++ ++ ++ /* Allocate buffers and instance data */ ++ ++ priv = kzalloc(sizeof(struct argon_mem_priv), GFP_KERNEL); ++ ++ if (!priv) { ++ err = -ENOMEM; ++ goto failed_inst_alloc; ++ } ++ platform_set_drvdata(pdev, priv); ++ ++ priv->dev = dev; ++ id = of_match_device(argon_mem_of_match, dev); ++ if (!id) ++ return -EINVAL; ++ priv->name = id->data; ++ ++ ioresource = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ if (ioresource) { ++ priv->regs_phys = ioresource->start; ++ priv->mem_window_len = ioresource->end - ioresource->start; ++ } else { ++ dev_err(priv->dev, "failed to get IO resource"); ++ err = -ENOENT; ++ goto failed_get_resource; ++ } ++ ++ /* Create character device entries */ ++ ++ err = alloc_chrdev_region(&priv->devid, ++ DEVICE_MINOR, 1, priv->name); ++ if (err != 0) { ++ dev_err(priv->dev, "unable to allocate device number"); ++ goto failed_alloc_chrdev; ++ } ++ cdev_init(&priv->argon_mem_cdev, &argon_mem_fops); ++ priv->argon_mem_cdev.owner = THIS_MODULE; ++ err = cdev_add(&priv->argon_mem_cdev, priv->devid, 1); ++ if (err != 0) { ++ dev_err(priv->dev, "unable to register device"); ++ goto failed_cdev_add; ++ } ++ ++ /* Create sysfs entries */ ++ ++ priv->class = class_create(THIS_MODULE, priv->name); ++ ptr_err = priv->class; ++ if (IS_ERR(ptr_err)) ++ goto failed_class_create; ++ ++ argon_mem_dev = device_create(priv->class, NULL, ++ priv->devid, NULL, ++ priv->name); ++ ptr_err = argon_mem_dev; ++ if (IS_ERR(ptr_err)) ++ goto failed_device_create; ++ ++ dev_info(priv->dev, "%s initialised: Registers at 0x%08lx length 0x%08lx", ++ priv->name, priv->regs_phys, priv->mem_window_len); ++ ++ return 0; ++ ++failed_device_create: ++ class_destroy(priv->class); ++failed_class_create: ++ cdev_del(&priv->argon_mem_cdev); ++ err = PTR_ERR(ptr_err); ++failed_cdev_add: ++ unregister_chrdev_region(priv->devid, 1); ++failed_alloc_chrdev: ++failed_get_resource: ++ kfree(priv); ++failed_inst_alloc: ++ dev_err(priv->dev, "could not load argon_mem"); ++ return err; ++} ++ ++static int argon_mem_remove(struct platform_device *pdev) ++{ ++ struct device *dev = &pdev->dev; ++ struct argon_mem_priv *priv = platform_get_drvdata(pdev); ++ ++ device_destroy(priv->class, priv->devid); ++ class_destroy(priv->class); ++ cdev_del(&priv->argon_mem_cdev); ++ unregister_chrdev_region(priv->devid, 1); ++ kfree(priv); ++ ++ dev_info(dev, "%s driver removed - OK", priv->name); ++ return 0; ++} ++ ++static const char argon_hevc_name[] = "argon-hevcmem"; ++static const char argon_h264_name[] = "argon-h264mem"; ++static const char argon_vp9_name[] = "argon-vp9mem"; ++static const char argon_intc_name[] = "argon-intcmem"; ++ ++static const struct of_device_id argon_mem_of_match[] = { ++ { ++ .compatible = "raspberrypi,argon-hevc-decoder", ++ .data = &argon_hevc_name, ++ }, ++ { ++ .compatible = "raspberrypi,argon-h264-decoder", ++ .data = &argon_h264_name, ++ }, ++ { ++ .compatible = "raspberrypi,argon-vp9-decoder", ++ .data = &argon_vp9_name, ++ }, ++ /* The "intc" is included as this block of hardware contains the ++ * "frame done" status flags. ++ */ ++ { ++ .compatible = "raspberrypi,argon-local-intc", ++ .data = &argon_intc_name, ++ }, ++ { /* sentinel */ }, ++}; ++ ++MODULE_DEVICE_TABLE(of, argon_mem_of_match); ++ ++static struct platform_driver argon_mem_driver = { ++ .probe = argon_mem_probe, ++ .remove = argon_mem_remove, ++ .driver = { ++ .name = DRIVER_NAME, ++ .owner = THIS_MODULE, ++ .of_match_table = argon_mem_of_match, ++ }, ++}; ++ ++module_platform_driver(argon_mem_driver); ++ ++MODULE_ALIAS("platform:argon-mem"); ++MODULE_LICENSE("GPL"); ++MODULE_DESCRIPTION("Driver for accessing Argon decoder registers from userspace"); ++MODULE_AUTHOR("Jonathan Bell <jonathan@raspberrypi.org>"); |