diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0046-char-broadcom-Add-vcio-module.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0046-char-broadcom-Add-vcio-module.patch | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0046-char-broadcom-Add-vcio-module.patch b/target/linux/brcm2708/patches-4.4/0046-char-broadcom-Add-vcio-module.patch new file mode 100644 index 0000000000..6070610d38 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0046-char-broadcom-Add-vcio-module.patch @@ -0,0 +1,221 @@ +From 75804edaed6c45d813dcee866d39445130d82539 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org> +Date: Fri, 26 Jun 2015 14:27:06 +0200 +Subject: [PATCH 046/232] char: broadcom: Add vcio module +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Add module for accessing the mailbox property channel through +/dev/vcio. Was previously in bcm2708-vcio. + +Signed-off-by: Noralf Trønnes <noralf@tronnes.org> +--- + drivers/char/broadcom/Kconfig | 6 ++ + drivers/char/broadcom/Makefile | 1 + + drivers/char/broadcom/vcio.c | 175 +++++++++++++++++++++++++++++++++++++++++ + 3 files changed, 182 insertions(+) + create mode 100644 drivers/char/broadcom/vcio.c + +--- a/drivers/char/broadcom/Kconfig ++++ b/drivers/char/broadcom/Kconfig +@@ -22,6 +22,12 @@ config BCM2708_VCMEM + help + Helper for videocore memory access and total size allocation. + ++config BCM_VCIO ++ tristate "Mailbox userspace access" ++ depends on BCM2835_MBOX ++ help ++ Gives access to the mailbox property channel from userspace. ++ + endif + + config BCM_VC_SM +--- a/drivers/char/broadcom/Makefile ++++ b/drivers/char/broadcom/Makefile +@@ -1,5 +1,6 @@ + obj-$(CONFIG_BCM_VC_CMA) += vc_cma/ + obj-$(CONFIG_BCM2708_VCMEM) += vc_mem.o ++obj-$(CONFIG_BCM_VCIO) += vcio.o + obj-$(CONFIG_BCM_VC_SM) += vc_sm/ + + obj-$(CONFIG_BCM2835_DEVGPIOMEM)+= bcm2835-gpiomem.o +--- /dev/null ++++ b/drivers/char/broadcom/vcio.c +@@ -0,0 +1,175 @@ ++/* ++ * Copyright (C) 2010 Broadcom ++ * Copyright (C) 2015 Noralf Trønnes ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ * ++ */ ++ ++#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt ++ ++#include <linux/cdev.h> ++#include <linux/device.h> ++#include <linux/fs.h> ++#include <linux/init.h> ++#include <linux/ioctl.h> ++#include <linux/module.h> ++#include <linux/slab.h> ++#include <linux/uaccess.h> ++#include <soc/bcm2835/raspberrypi-firmware.h> ++ ++#define MBOX_CHAN_PROPERTY 8 ++ ++#define VCIO_IOC_MAGIC 100 ++#define IOCTL_MBOX_PROPERTY _IOWR(VCIO_IOC_MAGIC, 0, char *) ++ ++static struct { ++ dev_t devt; ++ struct cdev cdev; ++ struct class *class; ++ struct rpi_firmware *fw; ++} vcio; ++ ++static int vcio_user_property_list(void *user) ++{ ++ u32 *buf, size; ++ int ret; ++ ++ /* The first 32-bit is the size of the buffer */ ++ if (copy_from_user(&size, user, sizeof(size))) ++ return -EFAULT; ++ ++ buf = kmalloc(size, GFP_KERNEL); ++ if (!buf) ++ return -ENOMEM; ++ ++ if (copy_from_user(buf, user, size)) { ++ kfree(buf); ++ return -EFAULT; ++ } ++ ++ /* Strip off protocol encapsulation */ ++ ret = rpi_firmware_property_list(vcio.fw, &buf[2], size - 12); ++ if (ret) { ++ kfree(buf); ++ return ret; ++ } ++ ++ buf[1] = RPI_FIRMWARE_STATUS_SUCCESS; ++ if (copy_to_user(user, buf, size)) ++ ret = -EFAULT; ++ ++ kfree(buf); ++ ++ return ret; ++} ++ ++static int vcio_device_open(struct inode *inode, struct file *file) ++{ ++ try_module_get(THIS_MODULE); ++ ++ return 0; ++} ++ ++static int vcio_device_release(struct inode *inode, struct file *file) ++{ ++ module_put(THIS_MODULE); ++ ++ return 0; ++} ++ ++static long vcio_device_ioctl(struct file *file, unsigned int ioctl_num, ++ unsigned long ioctl_param) ++{ ++ switch (ioctl_num) { ++ case IOCTL_MBOX_PROPERTY: ++ return vcio_user_property_list((void *)ioctl_param); ++ default: ++ pr_err("unknown ioctl: %d\n", ioctl_num); ++ return -EINVAL; ++ } ++} ++ ++const struct file_operations vcio_fops = { ++ .unlocked_ioctl = vcio_device_ioctl, ++ .open = vcio_device_open, ++ .release = vcio_device_release, ++}; ++ ++static int __init vcio_init(void) ++{ ++ struct device_node *np; ++ static struct device *dev; ++ int ret; ++ ++ np = of_find_compatible_node(NULL, NULL, ++ "raspberrypi,bcm2835-firmware"); ++/* Uncomment this when we only boot with Device Tree ++ if (!of_device_is_available(np)) ++ return -ENODEV; ++*/ ++ vcio.fw = rpi_firmware_get(np); ++ if (!vcio.fw) ++ return -ENODEV; ++ ++ ret = alloc_chrdev_region(&vcio.devt, 0, 1, "vcio"); ++ if (ret) { ++ pr_err("failed to allocate device number\n"); ++ return ret; ++ } ++ ++ cdev_init(&vcio.cdev, &vcio_fops); ++ vcio.cdev.owner = THIS_MODULE; ++ ret = cdev_add(&vcio.cdev, vcio.devt, 1); ++ if (ret) { ++ pr_err("failed to register device\n"); ++ goto err_unregister_chardev; ++ } ++ ++ /* ++ * Create sysfs entries ++ * 'bcm2708_vcio' is used for backwards compatibility so we don't break ++ * userspace. Raspian has a udev rule that changes the permissions. ++ */ ++ vcio.class = class_create(THIS_MODULE, "bcm2708_vcio"); ++ if (IS_ERR(vcio.class)) { ++ ret = PTR_ERR(vcio.class); ++ pr_err("failed to create class\n"); ++ goto err_cdev_del; ++ } ++ ++ dev = device_create(vcio.class, NULL, vcio.devt, NULL, "vcio"); ++ if (IS_ERR(dev)) { ++ ret = PTR_ERR(dev); ++ pr_err("failed to create device\n"); ++ goto err_class_destroy; ++ } ++ ++ return 0; ++ ++err_class_destroy: ++ class_destroy(vcio.class); ++err_cdev_del: ++ cdev_del(&vcio.cdev); ++err_unregister_chardev: ++ unregister_chrdev_region(vcio.devt, 1); ++ ++ return ret; ++} ++module_init(vcio_init); ++ ++static void __exit vcio_exit(void) ++{ ++ device_destroy(vcio.class, vcio.devt); ++ class_destroy(vcio.class); ++ cdev_del(&vcio.cdev); ++ unregister_chrdev_region(vcio.devt, 1); ++} ++module_exit(vcio_exit); ++ ++MODULE_AUTHOR("Gray Girling"); ++MODULE_AUTHOR("Noralf Trønnes"); ++MODULE_DESCRIPTION("Mailbox userspace access"); ++MODULE_LICENSE("GPL"); |