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Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0279-drivers-char-add-chardev-for-mmap-ing-the-RPiVid-con.patch')
-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0279-drivers-char-add-chardev-for-mmap-ing-the-RPiVid-con.patch387
1 files changed, 387 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0279-drivers-char-add-chardev-for-mmap-ing-the-RPiVid-con.patch b/target/linux/bcm27xx/patches-5.4/950-0279-drivers-char-add-chardev-for-mmap-ing-the-RPiVid-con.patch
new file mode 100644
index 0000000000..3f3c5ea148
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0279-drivers-char-add-chardev-for-mmap-ing-the-RPiVid-con.patch
@@ -0,0 +1,387 @@
+From dcf515d36ce574edd773c9c6321b6bbf9724e209 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 the RPiVid
+ 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/rpivid-mem.c | 286 +++++++++++++++++++++++++++++
+ drivers/mfd/bcm2835-pm.c | 12 +-
+ drivers/soc/bcm/bcm2835-power.c | 6 +-
+ include/linux/mfd/bcm2835-pm.h | 2 +-
+ 6 files changed, 305 insertions(+), 10 deletions(-)
+ create mode 100644 drivers/char/broadcom/rpivid-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 RPIVID_MEM
++ tristate "Character device driver for the Raspberry Pi RPIVid video 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
++ Raspberry Pi RPiVid 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_RPIVID_MEM) += rpivid-mem.o
+--- /dev/null
++++ b/drivers/char/broadcom/rpivid-mem.c
+@@ -0,0 +1,286 @@
++/**
++ * rpivid-mem.c - character device access to the RPiVid 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 "rpivid-mem"
++#define DEVICE_MINOR 0
++
++struct rpivid_mem_priv {
++ dev_t devid;
++ struct class *class;
++ struct cdev rpivid_mem_cdev;
++ unsigned long regs_phys;
++ unsigned long mem_window_len;
++ struct device *dev;
++ const char *name;
++};
++
++static int rpivid_mem_open(struct inode *inode, struct file *file)
++{
++ int dev = iminor(inode);
++ int ret = 0;
++ struct rpivid_mem_priv *priv;
++ if (dev != DEVICE_MINOR && dev != DEVICE_MINOR + 1)
++ ret = -ENXIO;
++
++ priv = container_of(inode->i_cdev, struct rpivid_mem_priv,
++ rpivid_mem_cdev);
++ if (!priv)
++ return -EINVAL;
++ file->private_data = priv;
++ return ret;
++}
++
++static int rpivid_mem_release(struct inode *inode, struct file *file)
++{
++ int dev = iminor(inode);
++ int ret = 0;
++
++ if (dev != DEVICE_MINOR && dev != DEVICE_MINOR + 1)
++ ret = -ENXIO;
++
++ return ret;
++}
++
++static const struct vm_operations_struct rpivid_mem_vm_ops = {
++#ifdef CONFIG_HAVE_IOREMAP_PROT
++ .access = generic_access_phys
++#endif
++};
++
++static int rpivid_mem_mmap(struct file *file, struct vm_area_struct *vma)
++{
++ struct rpivid_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 = &rpivid_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
++rpivid_mem_fops = {
++ .owner = THIS_MODULE,
++ .open = rpivid_mem_open,
++ .release = rpivid_mem_release,
++ .mmap = rpivid_mem_mmap,
++};
++
++static const struct of_device_id rpivid_mem_of_match[];
++static int rpivid_mem_probe(struct platform_device *pdev)
++{
++ int err;
++ void *ptr_err;
++ const struct of_device_id *id;
++ struct device *dev = &pdev->dev;
++ struct device *rpivid_mem_dev;
++ struct resource *ioresource;
++ struct rpivid_mem_priv *priv;
++
++
++ /* Allocate buffers and instance data */
++
++ priv = kzalloc(sizeof(struct rpivid_mem_priv), GFP_KERNEL);
++
++ if (!priv) {
++ err = -ENOMEM;
++ goto failed_inst_alloc;
++ }
++ platform_set_drvdata(pdev, priv);
++
++ priv->dev = dev;
++ id = of_match_device(rpivid_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, 2, priv->name);
++ if (err != 0) {
++ dev_err(priv->dev, "unable to allocate device number");
++ goto failed_alloc_chrdev;
++ }
++ cdev_init(&priv->rpivid_mem_cdev, &rpivid_mem_fops);
++ priv->rpivid_mem_cdev.owner = THIS_MODULE;
++ err = cdev_add(&priv->rpivid_mem_cdev, priv->devid, 2);
++ 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;
++
++ rpivid_mem_dev = device_create(priv->class, NULL,
++ priv->devid, NULL,
++ priv->name);
++ ptr_err = rpivid_mem_dev;
++ if (IS_ERR(ptr_err))
++ goto failed_device_create;
++
++ /* Legacy alias */
++ {
++ char *oldname = kstrdup(priv->name, GFP_KERNEL);
++
++ oldname[1] = 'a';
++ oldname[2] = 'r';
++ oldname[3] = 'g';
++ oldname[4] = 'o';
++ oldname[5] = 'n';
++ (void)device_create(priv->class, NULL, priv->devid + 1, NULL,
++ oldname + 1);
++ kfree(oldname);
++ }
++
++ 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->rpivid_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 rpivid_mem");
++ return err;
++}
++
++static int rpivid_mem_remove(struct platform_device *pdev)
++{
++ struct device *dev = &pdev->dev;
++ struct rpivid_mem_priv *priv = platform_get_drvdata(pdev);
++
++ device_destroy(priv->class, priv->devid);
++ class_destroy(priv->class);
++ cdev_del(&priv->rpivid_mem_cdev);
++ unregister_chrdev_region(priv->devid, 1);
++ kfree(priv);
++
++ dev_info(dev, "%s driver removed - OK", priv->name);
++ return 0;
++}
++
++static const struct of_device_id rpivid_mem_of_match[] = {
++ {
++ .compatible = "raspberrypi,rpivid-hevc-decoder",
++ .data = "rpivid-hevcmem",
++ },
++ {
++ .compatible = "raspberrypi,rpivid-h264-decoder",
++ .data = "rpivid-h264mem",
++ },
++ {
++ .compatible = "raspberrypi,rpivid-vp9-decoder",
++ .data = "rpivid-vp9mem",
++ },
++ /* The "intc" is included as this block of hardware contains the
++ * "frame done" status flags.
++ */
++ {
++ .compatible = "raspberrypi,rpivid-local-intc",
++ .data = "rpivid-intcmem",
++ },
++ { /* sentinel */ },
++};
++
++MODULE_DEVICE_TABLE(of, rpivid_mem_of_match);
++
++static struct platform_driver rpivid_mem_driver = {
++ .probe = rpivid_mem_probe,
++ .remove = rpivid_mem_remove,
++ .driver = {
++ .name = DRIVER_NAME,
++ .owner = THIS_MODULE,
++ .of_match_table = rpivid_mem_of_match,
++ },
++};
++
++module_platform_driver(rpivid_mem_driver);
++
++MODULE_ALIAS("platform:rpivid-mem");
++MODULE_LICENSE("GPL");
++MODULE_DESCRIPTION("Driver for accessing RPiVid decoder registers from userspace");
++MODULE_AUTHOR("Jonathan Bell <jonathan@raspberrypi.org>");
+--- a/drivers/mfd/bcm2835-pm.c
++++ b/drivers/mfd/bcm2835-pm.c
+@@ -50,14 +50,14 @@ static int bcm2835_pm_probe(struct platf
+ if (ret)
+ return ret;
+
+- /* Map the ARGON ASB regs if present. */
++ /* Map the RPiVid ASB regs if present. */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+ if (res) {
+- pm->arg_asb = devm_ioremap_resource(dev, res);
+- if (IS_ERR(pm->arg_asb)) {
+- dev_err(dev, "Failed to map ARGON ASB: %ld\n",
+- PTR_ERR(pm->arg_asb));
+- return PTR_ERR(pm->arg_asb);
++ pm->rpivid_asb = devm_ioremap_resource(dev, res);
++ if (IS_ERR(pm->rpivid_asb)) {
++ dev_err(dev, "Failed to map RPiVid ASB: %ld\n",
++ PTR_ERR(pm->rpivid_asb));
++ return PTR_ERR(pm->rpivid_asb);
+ }
+ }
+
+--- a/drivers/soc/bcm/bcm2835-power.c
++++ b/drivers/soc/bcm/bcm2835-power.c
+@@ -637,15 +637,15 @@ static int bcm2835_power_probe(struct pl
+ power->base = pm->base;
+ power->asb = pm->asb;
+
+- /* 2711 hack: the new ARGON ASB took over V3D, which is our
++ /* 2711 hack: the new RPiVid ASB took over V3D, which is our
+ * only consumer of this driver so far. The old ASB seems to
+ * still be present with ISP and H264 bits but no V3D, but I
+ * don't know if that's real or not. The V3D is in the same
+ * place in the new ASB as the old one, so just poke the new
+ * one for now.
+ */
+- if (pm->arg_asb) {
+- power->asb = pm->arg_asb;
++ if (pm->rpivid_asb) {
++ power->asb = pm->rpivid_asb;
+ power->is_2711 = true;
+ }
+
+--- a/include/linux/mfd/bcm2835-pm.h
++++ b/include/linux/mfd/bcm2835-pm.h
+@@ -9,7 +9,7 @@ struct bcm2835_pm {
+ struct device *dev;
+ void __iomem *base;
+ void __iomem *asb;
+- void __iomem *arg_asb;
++ void __iomem *rpivid_asb;
+ };
+
+ #endif /* BCM2835_MFD_PM_H */
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