S: Maintained
T: git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
F: Documentation/driver-api/vme.rst
-F: drivers/staging/vme/
+F: drivers/staging/vme_user/
F: drivers/vme/
F: include/linux/vme*
source "drivers/staging/qlge/Kconfig"
-
-source "drivers/staging/vme/devices/Kconfig"
+source "drivers/staging/vme_user/Kconfig"
endif # STAGING
obj-$(CONFIG_OCTEON_USB) += octeon-usb/
obj-$(CONFIG_VT6655) += vt6655/
obj-$(CONFIG_VT6656) += vt6656/
-obj-$(CONFIG_VME_BUS) += vme/
+obj-$(CONFIG_VME_BUS) += vme_user/
obj-$(CONFIG_IIO) += iio/
obj-$(CONFIG_FB_SM750) += sm750fb/
obj-$(CONFIG_USB_EMXX) += emxx_udc/
+++ /dev/null
-# SPDX-License-Identifier: GPL-2.0
-obj-y += devices/
+++ /dev/null
-# SPDX-License-Identifier: GPL-2.0
-comment "VME Device Drivers"
-
-config VME_USER
- tristate "VME user space access driver"
- depends on STAGING && VME_BUS
- help
- If you say Y here you want to be able to access a limited number of
- VME windows in a manner at least semi-compatible with the interface
- provided with the original driver at <http://www.vmelinux.org/>.
-
- To compile this driver as a module, choose M here. The module will
- be called vme_user. If unsure, say N.
+++ /dev/null
-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for the VME device drivers.
-#
-
-obj-$(CONFIG_VME_USER) += vme_user.o
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * VMEbus User access driver
- *
- * Author: Martyn Welch <martyn.welch@ge.com>
- * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
- *
- * Based on work by:
- * Tom Armistead and Ajit Prem
- * Copyright 2004 Motorola Inc.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/refcount.h>
-#include <linux/cdev.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/dma-mapping.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/ioctl.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/pagemap.h>
-#include <linux/pci.h>
-#include <linux/mutex.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/syscalls.h>
-#include <linux/types.h>
-
-#include <linux/io.h>
-#include <linux/uaccess.h>
-#include <linux/vme.h>
-
-#include "vme_user.h"
-
-static const char driver_name[] = "vme_user";
-
-static int bus[VME_USER_BUS_MAX];
-static unsigned int bus_num;
-
-/* Currently Documentation/admin-guide/devices.rst defines the
- * following for VME:
- *
- * 221 char VME bus
- * 0 = /dev/bus/vme/m0 First master image
- * 1 = /dev/bus/vme/m1 Second master image
- * 2 = /dev/bus/vme/m2 Third master image
- * 3 = /dev/bus/vme/m3 Fourth master image
- * 4 = /dev/bus/vme/s0 First slave image
- * 5 = /dev/bus/vme/s1 Second slave image
- * 6 = /dev/bus/vme/s2 Third slave image
- * 7 = /dev/bus/vme/s3 Fourth slave image
- * 8 = /dev/bus/vme/ctl Control
- *
- * It is expected that all VME bus drivers will use the
- * same interface. For interface documentation see
- * http://www.vmelinux.org/.
- *
- * However the VME driver at http://www.vmelinux.org/ is rather old and doesn't
- * even support the tsi148 chipset (which has 8 master and 8 slave windows).
- * We'll run with this for now as far as possible, however it probably makes
- * sense to get rid of the old mappings and just do everything dynamically.
- *
- * So for now, we'll restrict the driver to providing 4 masters and 4 slaves as
- * defined above and try to support at least some of the interface from
- * http://www.vmelinux.org/ as an alternative the driver can be written
- * providing a saner interface later.
- *
- * The vmelinux.org driver never supported slave images, the devices reserved
- * for slaves were repurposed to support all 8 master images on the UniverseII!
- * We shall support 4 masters and 4 slaves with this driver.
- */
-#define VME_MAJOR 221 /* VME Major Device Number */
-#define VME_DEVS 9 /* Number of dev entries */
-
-#define MASTER_MINOR 0
-#define MASTER_MAX 3
-#define SLAVE_MINOR 4
-#define SLAVE_MAX 7
-#define CONTROL_MINOR 8
-
-#define PCI_BUF_SIZE 0x20000 /* Size of one slave image buffer */
-
-/*
- * Structure to handle image related parameters.
- */
-struct image_desc {
- void *kern_buf; /* Buffer address in kernel space */
- dma_addr_t pci_buf; /* Buffer address in PCI address space */
- unsigned long long size_buf; /* Buffer size */
- struct mutex mutex; /* Mutex for locking image */
- struct device *device; /* Sysfs device */
- struct vme_resource *resource; /* VME resource */
- int mmap_count; /* Number of current mmap's */
-};
-
-static struct image_desc image[VME_DEVS];
-
-static struct cdev *vme_user_cdev; /* Character device */
-static struct class *vme_user_sysfs_class; /* Sysfs class */
-static struct vme_dev *vme_user_bridge; /* Pointer to user device */
-
-static const int type[VME_DEVS] = { MASTER_MINOR, MASTER_MINOR,
- MASTER_MINOR, MASTER_MINOR,
- SLAVE_MINOR, SLAVE_MINOR,
- SLAVE_MINOR, SLAVE_MINOR,
- CONTROL_MINOR
- };
-
-struct vme_user_vma_priv {
- unsigned int minor;
- refcount_t refcnt;
-};
-
-static ssize_t resource_to_user(int minor, char __user *buf, size_t count,
- loff_t *ppos)
-{
- ssize_t copied = 0;
-
- if (count > image[minor].size_buf)
- count = image[minor].size_buf;
-
- copied = vme_master_read(image[minor].resource, image[minor].kern_buf,
- count, *ppos);
- if (copied < 0)
- return (int)copied;
-
- if (copy_to_user(buf, image[minor].kern_buf, (unsigned long)copied))
- return -EFAULT;
-
- return copied;
-}
-
-static ssize_t resource_from_user(unsigned int minor, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- if (count > image[minor].size_buf)
- count = image[minor].size_buf;
-
- if (copy_from_user(image[minor].kern_buf, buf, (unsigned long)count))
- return -EFAULT;
-
- return vme_master_write(image[minor].resource, image[minor].kern_buf,
- count, *ppos);
-}
-
-static ssize_t buffer_to_user(unsigned int minor, char __user *buf,
- size_t count, loff_t *ppos)
-{
- void *image_ptr;
-
- image_ptr = image[minor].kern_buf + *ppos;
- if (copy_to_user(buf, image_ptr, (unsigned long)count))
- return -EFAULT;
-
- return count;
-}
-
-static ssize_t buffer_from_user(unsigned int minor, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- void *image_ptr;
-
- image_ptr = image[minor].kern_buf + *ppos;
- if (copy_from_user(image_ptr, buf, (unsigned long)count))
- return -EFAULT;
-
- return count;
-}
-
-static ssize_t vme_user_read(struct file *file, char __user *buf, size_t count,
- loff_t *ppos)
-{
- unsigned int minor = iminor(file_inode(file));
- ssize_t retval;
- size_t image_size;
-
- if (minor == CONTROL_MINOR)
- return 0;
-
- mutex_lock(&image[minor].mutex);
-
- /* XXX Do we *really* want this helper - we can use vme_*_get ? */
- image_size = vme_get_size(image[minor].resource);
-
- /* Ensure we are starting at a valid location */
- if ((*ppos < 0) || (*ppos > (image_size - 1))) {
- mutex_unlock(&image[minor].mutex);
- return 0;
- }
-
- /* Ensure not reading past end of the image */
- if (*ppos + count > image_size)
- count = image_size - *ppos;
-
- switch (type[minor]) {
- case MASTER_MINOR:
- retval = resource_to_user(minor, buf, count, ppos);
- break;
- case SLAVE_MINOR:
- retval = buffer_to_user(minor, buf, count, ppos);
- break;
- default:
- retval = -EINVAL;
- }
-
- mutex_unlock(&image[minor].mutex);
- if (retval > 0)
- *ppos += retval;
-
- return retval;
-}
-
-static ssize_t vme_user_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- unsigned int minor = iminor(file_inode(file));
- ssize_t retval;
- size_t image_size;
-
- if (minor == CONTROL_MINOR)
- return 0;
-
- mutex_lock(&image[minor].mutex);
-
- image_size = vme_get_size(image[minor].resource);
-
- /* Ensure we are starting at a valid location */
- if ((*ppos < 0) || (*ppos > (image_size - 1))) {
- mutex_unlock(&image[minor].mutex);
- return 0;
- }
-
- /* Ensure not reading past end of the image */
- if (*ppos + count > image_size)
- count = image_size - *ppos;
-
- switch (type[minor]) {
- case MASTER_MINOR:
- retval = resource_from_user(minor, buf, count, ppos);
- break;
- case SLAVE_MINOR:
- retval = buffer_from_user(minor, buf, count, ppos);
- break;
- default:
- retval = -EINVAL;
- }
-
- mutex_unlock(&image[minor].mutex);
-
- if (retval > 0)
- *ppos += retval;
-
- return retval;
-}
-
-static loff_t vme_user_llseek(struct file *file, loff_t off, int whence)
-{
- unsigned int minor = iminor(file_inode(file));
- size_t image_size;
- loff_t res;
-
- switch (type[minor]) {
- case MASTER_MINOR:
- case SLAVE_MINOR:
- mutex_lock(&image[minor].mutex);
- image_size = vme_get_size(image[minor].resource);
- res = fixed_size_llseek(file, off, whence, image_size);
- mutex_unlock(&image[minor].mutex);
- return res;
- }
-
- return -EINVAL;
-}
-
-/*
- * The ioctls provided by the old VME access method (the one at vmelinux.org)
- * are most certainly wrong as the effectively push the registers layout
- * through to user space. Given that the VME core can handle multiple bridges,
- * with different register layouts this is most certainly not the way to go.
- *
- * We aren't using the structures defined in the Motorola driver either - these
- * are also quite low level, however we should use the definitions that have
- * already been defined.
- */
-static int vme_user_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- struct vme_master master;
- struct vme_slave slave;
- struct vme_irq_id irq_req;
- unsigned long copied;
- unsigned int minor = iminor(inode);
- int retval;
- dma_addr_t pci_addr;
- void __user *argp = (void __user *)arg;
-
- switch (type[minor]) {
- case CONTROL_MINOR:
- switch (cmd) {
- case VME_IRQ_GEN:
- copied = copy_from_user(&irq_req, argp,
- sizeof(irq_req));
- if (copied) {
- pr_warn("Partial copy from userspace\n");
- return -EFAULT;
- }
-
- return vme_irq_generate(vme_user_bridge,
- irq_req.level,
- irq_req.statid);
- }
- break;
- case MASTER_MINOR:
- switch (cmd) {
- case VME_GET_MASTER:
- memset(&master, 0, sizeof(master));
-
- /* XXX We do not want to push aspace, cycle and width
- * to userspace as they are
- */
- retval = vme_master_get(image[minor].resource,
- &master.enable,
- &master.vme_addr,
- &master.size, &master.aspace,
- &master.cycle, &master.dwidth);
-
- copied = copy_to_user(argp, &master,
- sizeof(master));
- if (copied) {
- pr_warn("Partial copy to userspace\n");
- return -EFAULT;
- }
-
- return retval;
-
- case VME_SET_MASTER:
-
- if (image[minor].mmap_count != 0) {
- pr_warn("Can't adjust mapped window\n");
- return -EPERM;
- }
-
- copied = copy_from_user(&master, argp, sizeof(master));
- if (copied) {
- pr_warn("Partial copy from userspace\n");
- return -EFAULT;
- }
-
- /* XXX We do not want to push aspace, cycle and width
- * to userspace as they are
- */
- return vme_master_set(image[minor].resource,
- master.enable, master.vme_addr, master.size,
- master.aspace, master.cycle, master.dwidth);
-
- break;
- }
- break;
- case SLAVE_MINOR:
- switch (cmd) {
- case VME_GET_SLAVE:
- memset(&slave, 0, sizeof(slave));
-
- /* XXX We do not want to push aspace, cycle and width
- * to userspace as they are
- */
- retval = vme_slave_get(image[minor].resource,
- &slave.enable, &slave.vme_addr,
- &slave.size, &pci_addr,
- &slave.aspace, &slave.cycle);
-
- copied = copy_to_user(argp, &slave,
- sizeof(slave));
- if (copied) {
- pr_warn("Partial copy to userspace\n");
- return -EFAULT;
- }
-
- return retval;
-
- case VME_SET_SLAVE:
-
- copied = copy_from_user(&slave, argp, sizeof(slave));
- if (copied) {
- pr_warn("Partial copy from userspace\n");
- return -EFAULT;
- }
-
- /* XXX We do not want to push aspace, cycle and width
- * to userspace as they are
- */
- return vme_slave_set(image[minor].resource,
- slave.enable, slave.vme_addr, slave.size,
- image[minor].pci_buf, slave.aspace,
- slave.cycle);
-
- break;
- }
- break;
- }
-
- return -EINVAL;
-}
-
-static long
-vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- int ret;
- struct inode *inode = file_inode(file);
- unsigned int minor = iminor(inode);
-
- mutex_lock(&image[minor].mutex);
- ret = vme_user_ioctl(inode, file, cmd, arg);
- mutex_unlock(&image[minor].mutex);
-
- return ret;
-}
-
-static void vme_user_vm_open(struct vm_area_struct *vma)
-{
- struct vme_user_vma_priv *vma_priv = vma->vm_private_data;
-
- refcount_inc(&vma_priv->refcnt);
-}
-
-static void vme_user_vm_close(struct vm_area_struct *vma)
-{
- struct vme_user_vma_priv *vma_priv = vma->vm_private_data;
- unsigned int minor = vma_priv->minor;
-
- if (!refcount_dec_and_test(&vma_priv->refcnt))
- return;
-
- mutex_lock(&image[minor].mutex);
- image[minor].mmap_count--;
- mutex_unlock(&image[minor].mutex);
-
- kfree(vma_priv);
-}
-
-static const struct vm_operations_struct vme_user_vm_ops = {
- .open = vme_user_vm_open,
- .close = vme_user_vm_close,
-};
-
-static int vme_user_master_mmap(unsigned int minor, struct vm_area_struct *vma)
-{
- int err;
- struct vme_user_vma_priv *vma_priv;
-
- mutex_lock(&image[minor].mutex);
-
- err = vme_master_mmap(image[minor].resource, vma);
- if (err) {
- mutex_unlock(&image[minor].mutex);
- return err;
- }
-
- vma_priv = kmalloc(sizeof(*vma_priv), GFP_KERNEL);
- if (!vma_priv) {
- mutex_unlock(&image[minor].mutex);
- return -ENOMEM;
- }
-
- vma_priv->minor = minor;
- refcount_set(&vma_priv->refcnt, 1);
- vma->vm_ops = &vme_user_vm_ops;
- vma->vm_private_data = vma_priv;
-
- image[minor].mmap_count++;
-
- mutex_unlock(&image[minor].mutex);
-
- return 0;
-}
-
-static int vme_user_mmap(struct file *file, struct vm_area_struct *vma)
-{
- unsigned int minor = iminor(file_inode(file));
-
- if (type[minor] == MASTER_MINOR)
- return vme_user_master_mmap(minor, vma);
-
- return -ENODEV;
-}
-
-static const struct file_operations vme_user_fops = {
- .read = vme_user_read,
- .write = vme_user_write,
- .llseek = vme_user_llseek,
- .unlocked_ioctl = vme_user_unlocked_ioctl,
- .compat_ioctl = compat_ptr_ioctl,
- .mmap = vme_user_mmap,
-};
-
-static int vme_user_match(struct vme_dev *vdev)
-{
- int i;
-
- int cur_bus = vme_bus_num(vdev);
- int cur_slot = vme_slot_num(vdev);
-
- for (i = 0; i < bus_num; i++)
- if ((cur_bus == bus[i]) && (cur_slot == vdev->num))
- return 1;
-
- return 0;
-}
-
-/*
- * In this simple access driver, the old behaviour is being preserved as much
- * as practical. We will therefore reserve the buffers and request the images
- * here so that we don't have to do it later.
- */
-static int vme_user_probe(struct vme_dev *vdev)
-{
- int i, err;
- char *name;
-
- /* Save pointer to the bridge device */
- if (vme_user_bridge) {
- dev_err(&vdev->dev, "Driver can only be loaded for 1 device\n");
- err = -EINVAL;
- goto err_dev;
- }
- vme_user_bridge = vdev;
-
- /* Initialise descriptors */
- for (i = 0; i < VME_DEVS; i++) {
- image[i].kern_buf = NULL;
- image[i].pci_buf = 0;
- mutex_init(&image[i].mutex);
- image[i].device = NULL;
- image[i].resource = NULL;
- }
-
- /* Assign major and minor numbers for the driver */
- err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS,
- driver_name);
- if (err) {
- dev_warn(&vdev->dev, "Error getting Major Number %d for driver.\n",
- VME_MAJOR);
- goto err_region;
- }
-
- /* Register the driver as a char device */
- vme_user_cdev = cdev_alloc();
- if (!vme_user_cdev) {
- err = -ENOMEM;
- goto err_char;
- }
- vme_user_cdev->ops = &vme_user_fops;
- vme_user_cdev->owner = THIS_MODULE;
- err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS);
- if (err)
- goto err_class;
-
- /* Request slave resources and allocate buffers (128kB wide) */
- for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) {
- /* XXX Need to properly request attributes */
- /* For ca91cx42 bridge there are only two slave windows
- * supporting A16 addressing, so we request A24 supported
- * by all windows.
- */
- image[i].resource = vme_slave_request(vme_user_bridge,
- VME_A24, VME_SCT);
- if (!image[i].resource) {
- dev_warn(&vdev->dev,
- "Unable to allocate slave resource\n");
- err = -ENOMEM;
- goto err_slave;
- }
- image[i].size_buf = PCI_BUF_SIZE;
- image[i].kern_buf = vme_alloc_consistent(image[i].resource,
- image[i].size_buf,
- &image[i].pci_buf);
- if (!image[i].kern_buf) {
- dev_warn(&vdev->dev,
- "Unable to allocate memory for buffer\n");
- image[i].pci_buf = 0;
- vme_slave_free(image[i].resource);
- err = -ENOMEM;
- goto err_slave;
- }
- }
-
- /*
- * Request master resources allocate page sized buffers for small
- * reads and writes
- */
- for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) {
- /* XXX Need to properly request attributes */
- image[i].resource = vme_master_request(vme_user_bridge,
- VME_A32, VME_SCT,
- VME_D32);
- if (!image[i].resource) {
- dev_warn(&vdev->dev,
- "Unable to allocate master resource\n");
- err = -ENOMEM;
- goto err_master;
- }
- image[i].size_buf = PCI_BUF_SIZE;
- image[i].kern_buf = kmalloc(image[i].size_buf, GFP_KERNEL);
- if (!image[i].kern_buf) {
- err = -ENOMEM;
- vme_master_free(image[i].resource);
- goto err_master;
- }
- }
-
- /* Create sysfs entries - on udev systems this creates the dev files */
- vme_user_sysfs_class = class_create(THIS_MODULE, driver_name);
- if (IS_ERR(vme_user_sysfs_class)) {
- dev_err(&vdev->dev, "Error creating vme_user class.\n");
- err = PTR_ERR(vme_user_sysfs_class);
- goto err_master;
- }
-
- /* Add sysfs Entries */
- for (i = 0; i < VME_DEVS; i++) {
- int num;
-
- switch (type[i]) {
- case MASTER_MINOR:
- name = "bus/vme/m%d";
- break;
- case CONTROL_MINOR:
- name = "bus/vme/ctl";
- break;
- case SLAVE_MINOR:
- name = "bus/vme/s%d";
- break;
- default:
- err = -EINVAL;
- goto err_sysfs;
- }
-
- num = (type[i] == SLAVE_MINOR) ? i - (MASTER_MAX + 1) : i;
- image[i].device = device_create(vme_user_sysfs_class, NULL,
- MKDEV(VME_MAJOR, i), NULL,
- name, num);
- if (IS_ERR(image[i].device)) {
- dev_info(&vdev->dev, "Error creating sysfs device\n");
- err = PTR_ERR(image[i].device);
- goto err_sysfs;
- }
- }
-
- return 0;
-
-err_sysfs:
- while (i > 0) {
- i--;
- device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i));
- }
- class_destroy(vme_user_sysfs_class);
-
- /* Ensure counter set correctly to unalloc all master windows */
- i = MASTER_MAX + 1;
-err_master:
- while (i > MASTER_MINOR) {
- i--;
- kfree(image[i].kern_buf);
- vme_master_free(image[i].resource);
- }
-
- /*
- * Ensure counter set correctly to unalloc all slave windows and buffers
- */
- i = SLAVE_MAX + 1;
-err_slave:
- while (i > SLAVE_MINOR) {
- i--;
- vme_free_consistent(image[i].resource, image[i].size_buf,
- image[i].kern_buf, image[i].pci_buf);
- vme_slave_free(image[i].resource);
- }
-err_class:
- cdev_del(vme_user_cdev);
-err_char:
- unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
-err_region:
-err_dev:
- return err;
-}
-
-static void vme_user_remove(struct vme_dev *dev)
-{
- int i;
-
- /* Remove sysfs Entries */
- for (i = 0; i < VME_DEVS; i++) {
- mutex_destroy(&image[i].mutex);
- device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i));
- }
- class_destroy(vme_user_sysfs_class);
-
- for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) {
- kfree(image[i].kern_buf);
- vme_master_free(image[i].resource);
- }
-
- for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) {
- vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0);
- vme_free_consistent(image[i].resource, image[i].size_buf,
- image[i].kern_buf, image[i].pci_buf);
- vme_slave_free(image[i].resource);
- }
-
- /* Unregister device driver */
- cdev_del(vme_user_cdev);
-
- /* Unregister the major and minor device numbers */
- unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
-}
-
-static struct vme_driver vme_user_driver = {
- .name = driver_name,
- .match = vme_user_match,
- .probe = vme_user_probe,
- .remove = vme_user_remove,
-};
-
-static int __init vme_user_init(void)
-{
- int retval = 0;
-
- pr_info("VME User Space Access Driver\n");
-
- if (bus_num == 0) {
- pr_err("No cards, skipping registration\n");
- retval = -ENODEV;
- goto err_nocard;
- }
-
- /* Let's start by supporting one bus, we can support more than one
- * in future revisions if that ever becomes necessary.
- */
- if (bus_num > VME_USER_BUS_MAX) {
- pr_err("Driver only able to handle %d buses\n",
- VME_USER_BUS_MAX);
- bus_num = VME_USER_BUS_MAX;
- }
-
- /*
- * Here we just register the maximum number of devices we can and
- * leave vme_user_match() to allow only 1 to go through to probe().
- * This way, if we later want to allow multiple user access devices,
- * we just change the code in vme_user_match().
- */
- retval = vme_register_driver(&vme_user_driver, VME_MAX_SLOTS);
- if (retval)
- goto err_reg;
-
- return retval;
-
-err_reg:
-err_nocard:
- return retval;
-}
-
-static void __exit vme_user_exit(void)
-{
- vme_unregister_driver(&vme_user_driver);
-}
-
-MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected");
-module_param_array(bus, int, &bus_num, 0000);
-
-MODULE_DESCRIPTION("VME User Space Access Driver");
-MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com>");
-MODULE_LICENSE("GPL");
-
-module_init(vme_user_init);
-module_exit(vme_user_exit);
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _VME_USER_H_
-#define _VME_USER_H_
-
-#define VME_USER_BUS_MAX 1
-
-/*
- * VMEbus Master Window Configuration Structure
- */
-struct vme_master {
- __u32 enable; /* State of Window */
- __u64 vme_addr; /* Starting Address on the VMEbus */
- __u64 size; /* Window Size */
- __u32 aspace; /* Address Space */
- __u32 cycle; /* Cycle properties */
- __u32 dwidth; /* Maximum Data Width */
-#if 0
- char prefetchenable; /* Prefetch Read Enable State */
- int prefetchsize; /* Prefetch Read Size (Cache Lines) */
- char wrpostenable; /* Write Post State */
-#endif
-} __packed;
-
-/*
- * IOCTL Commands and structures
- */
-
-/* Magic number for use in ioctls */
-#define VME_IOC_MAGIC 0xAE
-
-/* VMEbus Slave Window Configuration Structure */
-struct vme_slave {
- __u32 enable; /* State of Window */
- __u64 vme_addr; /* Starting Address on the VMEbus */
- __u64 size; /* Window Size */
- __u32 aspace; /* Address Space */
- __u32 cycle; /* Cycle properties */
-#if 0
- char wrpostenable; /* Write Post State */
- char rmwlock; /* Lock PCI during RMW Cycles */
- char data64bitcapable; /* non-VMEbus capable of 64-bit Data */
-#endif
-} __packed;
-
-struct vme_irq_id {
- __u8 level;
- __u8 statid;
-};
-
-#define VME_GET_SLAVE _IOR(VME_IOC_MAGIC, 1, struct vme_slave)
-#define VME_SET_SLAVE _IOW(VME_IOC_MAGIC, 2, struct vme_slave)
-#define VME_GET_MASTER _IOR(VME_IOC_MAGIC, 3, struct vme_master)
-#define VME_SET_MASTER _IOW(VME_IOC_MAGIC, 4, struct vme_master)
-#define VME_IRQ_GEN _IOW(VME_IOC_MAGIC, 5, struct vme_irq_id)
-
-#endif /* _VME_USER_H_ */
-
--- /dev/null
+# SPDX-License-Identifier: GPL-2.0
+comment "VME Device Drivers"
+
+config VME_USER
+ tristate "VME user space access driver"
+ depends on STAGING && VME_BUS
+ help
+ If you say Y here you want to be able to access a limited number of
+ VME windows in a manner at least semi-compatible with the interface
+ provided with the original driver at <http://www.vmelinux.org/>.
+
+ To compile this driver as a module, choose M here. The module will
+ be called vme_user. If unsure, say N.
--- /dev/null
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the VME device drivers.
+#
+
+obj-$(CONFIG_VME_USER) += vme_user.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * VMEbus User access driver
+ *
+ * Author: Martyn Welch <martyn.welch@ge.com>
+ * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
+ *
+ * Based on work by:
+ * Tom Armistead and Ajit Prem
+ * Copyright 2004 Motorola Inc.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/refcount.h>
+#include <linux/cdev.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/pagemap.h>
+#include <linux/pci.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/syscalls.h>
+#include <linux/types.h>
+
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <linux/vme.h>
+
+#include "vme_user.h"
+
+static const char driver_name[] = "vme_user";
+
+static int bus[VME_USER_BUS_MAX];
+static unsigned int bus_num;
+
+/* Currently Documentation/admin-guide/devices.rst defines the
+ * following for VME:
+ *
+ * 221 char VME bus
+ * 0 = /dev/bus/vme/m0 First master image
+ * 1 = /dev/bus/vme/m1 Second master image
+ * 2 = /dev/bus/vme/m2 Third master image
+ * 3 = /dev/bus/vme/m3 Fourth master image
+ * 4 = /dev/bus/vme/s0 First slave image
+ * 5 = /dev/bus/vme/s1 Second slave image
+ * 6 = /dev/bus/vme/s2 Third slave image
+ * 7 = /dev/bus/vme/s3 Fourth slave image
+ * 8 = /dev/bus/vme/ctl Control
+ *
+ * It is expected that all VME bus drivers will use the
+ * same interface. For interface documentation see
+ * http://www.vmelinux.org/.
+ *
+ * However the VME driver at http://www.vmelinux.org/ is rather old and doesn't
+ * even support the tsi148 chipset (which has 8 master and 8 slave windows).
+ * We'll run with this for now as far as possible, however it probably makes
+ * sense to get rid of the old mappings and just do everything dynamically.
+ *
+ * So for now, we'll restrict the driver to providing 4 masters and 4 slaves as
+ * defined above and try to support at least some of the interface from
+ * http://www.vmelinux.org/ as an alternative the driver can be written
+ * providing a saner interface later.
+ *
+ * The vmelinux.org driver never supported slave images, the devices reserved
+ * for slaves were repurposed to support all 8 master images on the UniverseII!
+ * We shall support 4 masters and 4 slaves with this driver.
+ */
+#define VME_MAJOR 221 /* VME Major Device Number */
+#define VME_DEVS 9 /* Number of dev entries */
+
+#define MASTER_MINOR 0
+#define MASTER_MAX 3
+#define SLAVE_MINOR 4
+#define SLAVE_MAX 7
+#define CONTROL_MINOR 8
+
+#define PCI_BUF_SIZE 0x20000 /* Size of one slave image buffer */
+
+/*
+ * Structure to handle image related parameters.
+ */
+struct image_desc {
+ void *kern_buf; /* Buffer address in kernel space */
+ dma_addr_t pci_buf; /* Buffer address in PCI address space */
+ unsigned long long size_buf; /* Buffer size */
+ struct mutex mutex; /* Mutex for locking image */
+ struct device *device; /* Sysfs device */
+ struct vme_resource *resource; /* VME resource */
+ int mmap_count; /* Number of current mmap's */
+};
+
+static struct image_desc image[VME_DEVS];
+
+static struct cdev *vme_user_cdev; /* Character device */
+static struct class *vme_user_sysfs_class; /* Sysfs class */
+static struct vme_dev *vme_user_bridge; /* Pointer to user device */
+
+static const int type[VME_DEVS] = { MASTER_MINOR, MASTER_MINOR,
+ MASTER_MINOR, MASTER_MINOR,
+ SLAVE_MINOR, SLAVE_MINOR,
+ SLAVE_MINOR, SLAVE_MINOR,
+ CONTROL_MINOR
+ };
+
+struct vme_user_vma_priv {
+ unsigned int minor;
+ refcount_t refcnt;
+};
+
+static ssize_t resource_to_user(int minor, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ ssize_t copied = 0;
+
+ if (count > image[minor].size_buf)
+ count = image[minor].size_buf;
+
+ copied = vme_master_read(image[minor].resource, image[minor].kern_buf,
+ count, *ppos);
+ if (copied < 0)
+ return (int)copied;
+
+ if (copy_to_user(buf, image[minor].kern_buf, (unsigned long)copied))
+ return -EFAULT;
+
+ return copied;
+}
+
+static ssize_t resource_from_user(unsigned int minor, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ if (count > image[minor].size_buf)
+ count = image[minor].size_buf;
+
+ if (copy_from_user(image[minor].kern_buf, buf, (unsigned long)count))
+ return -EFAULT;
+
+ return vme_master_write(image[minor].resource, image[minor].kern_buf,
+ count, *ppos);
+}
+
+static ssize_t buffer_to_user(unsigned int minor, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ void *image_ptr;
+
+ image_ptr = image[minor].kern_buf + *ppos;
+ if (copy_to_user(buf, image_ptr, (unsigned long)count))
+ return -EFAULT;
+
+ return count;
+}
+
+static ssize_t buffer_from_user(unsigned int minor, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ void *image_ptr;
+
+ image_ptr = image[minor].kern_buf + *ppos;
+ if (copy_from_user(image_ptr, buf, (unsigned long)count))
+ return -EFAULT;
+
+ return count;
+}
+
+static ssize_t vme_user_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ unsigned int minor = iminor(file_inode(file));
+ ssize_t retval;
+ size_t image_size;
+
+ if (minor == CONTROL_MINOR)
+ return 0;
+
+ mutex_lock(&image[minor].mutex);
+
+ /* XXX Do we *really* want this helper - we can use vme_*_get ? */
+ image_size = vme_get_size(image[minor].resource);
+
+ /* Ensure we are starting at a valid location */
+ if ((*ppos < 0) || (*ppos > (image_size - 1))) {
+ mutex_unlock(&image[minor].mutex);
+ return 0;
+ }
+
+ /* Ensure not reading past end of the image */
+ if (*ppos + count > image_size)
+ count = image_size - *ppos;
+
+ switch (type[minor]) {
+ case MASTER_MINOR:
+ retval = resource_to_user(minor, buf, count, ppos);
+ break;
+ case SLAVE_MINOR:
+ retval = buffer_to_user(minor, buf, count, ppos);
+ break;
+ default:
+ retval = -EINVAL;
+ }
+
+ mutex_unlock(&image[minor].mutex);
+ if (retval > 0)
+ *ppos += retval;
+
+ return retval;
+}
+
+static ssize_t vme_user_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ unsigned int minor = iminor(file_inode(file));
+ ssize_t retval;
+ size_t image_size;
+
+ if (minor == CONTROL_MINOR)
+ return 0;
+
+ mutex_lock(&image[minor].mutex);
+
+ image_size = vme_get_size(image[minor].resource);
+
+ /* Ensure we are starting at a valid location */
+ if ((*ppos < 0) || (*ppos > (image_size - 1))) {
+ mutex_unlock(&image[minor].mutex);
+ return 0;
+ }
+
+ /* Ensure not reading past end of the image */
+ if (*ppos + count > image_size)
+ count = image_size - *ppos;
+
+ switch (type[minor]) {
+ case MASTER_MINOR:
+ retval = resource_from_user(minor, buf, count, ppos);
+ break;
+ case SLAVE_MINOR:
+ retval = buffer_from_user(minor, buf, count, ppos);
+ break;
+ default:
+ retval = -EINVAL;
+ }
+
+ mutex_unlock(&image[minor].mutex);
+
+ if (retval > 0)
+ *ppos += retval;
+
+ return retval;
+}
+
+static loff_t vme_user_llseek(struct file *file, loff_t off, int whence)
+{
+ unsigned int minor = iminor(file_inode(file));
+ size_t image_size;
+ loff_t res;
+
+ switch (type[minor]) {
+ case MASTER_MINOR:
+ case SLAVE_MINOR:
+ mutex_lock(&image[minor].mutex);
+ image_size = vme_get_size(image[minor].resource);
+ res = fixed_size_llseek(file, off, whence, image_size);
+ mutex_unlock(&image[minor].mutex);
+ return res;
+ }
+
+ return -EINVAL;
+}
+
+/*
+ * The ioctls provided by the old VME access method (the one at vmelinux.org)
+ * are most certainly wrong as the effectively push the registers layout
+ * through to user space. Given that the VME core can handle multiple bridges,
+ * with different register layouts this is most certainly not the way to go.
+ *
+ * We aren't using the structures defined in the Motorola driver either - these
+ * are also quite low level, however we should use the definitions that have
+ * already been defined.
+ */
+static int vme_user_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vme_master master;
+ struct vme_slave slave;
+ struct vme_irq_id irq_req;
+ unsigned long copied;
+ unsigned int minor = iminor(inode);
+ int retval;
+ dma_addr_t pci_addr;
+ void __user *argp = (void __user *)arg;
+
+ switch (type[minor]) {
+ case CONTROL_MINOR:
+ switch (cmd) {
+ case VME_IRQ_GEN:
+ copied = copy_from_user(&irq_req, argp,
+ sizeof(irq_req));
+ if (copied) {
+ pr_warn("Partial copy from userspace\n");
+ return -EFAULT;
+ }
+
+ return vme_irq_generate(vme_user_bridge,
+ irq_req.level,
+ irq_req.statid);
+ }
+ break;
+ case MASTER_MINOR:
+ switch (cmd) {
+ case VME_GET_MASTER:
+ memset(&master, 0, sizeof(master));
+
+ /* XXX We do not want to push aspace, cycle and width
+ * to userspace as they are
+ */
+ retval = vme_master_get(image[minor].resource,
+ &master.enable,
+ &master.vme_addr,
+ &master.size, &master.aspace,
+ &master.cycle, &master.dwidth);
+
+ copied = copy_to_user(argp, &master,
+ sizeof(master));
+ if (copied) {
+ pr_warn("Partial copy to userspace\n");
+ return -EFAULT;
+ }
+
+ return retval;
+
+ case VME_SET_MASTER:
+
+ if (image[minor].mmap_count != 0) {
+ pr_warn("Can't adjust mapped window\n");
+ return -EPERM;
+ }
+
+ copied = copy_from_user(&master, argp, sizeof(master));
+ if (copied) {
+ pr_warn("Partial copy from userspace\n");
+ return -EFAULT;
+ }
+
+ /* XXX We do not want to push aspace, cycle and width
+ * to userspace as they are
+ */
+ return vme_master_set(image[minor].resource,
+ master.enable, master.vme_addr, master.size,
+ master.aspace, master.cycle, master.dwidth);
+
+ break;
+ }
+ break;
+ case SLAVE_MINOR:
+ switch (cmd) {
+ case VME_GET_SLAVE:
+ memset(&slave, 0, sizeof(slave));
+
+ /* XXX We do not want to push aspace, cycle and width
+ * to userspace as they are
+ */
+ retval = vme_slave_get(image[minor].resource,
+ &slave.enable, &slave.vme_addr,
+ &slave.size, &pci_addr,
+ &slave.aspace, &slave.cycle);
+
+ copied = copy_to_user(argp, &slave,
+ sizeof(slave));
+ if (copied) {
+ pr_warn("Partial copy to userspace\n");
+ return -EFAULT;
+ }
+
+ return retval;
+
+ case VME_SET_SLAVE:
+
+ copied = copy_from_user(&slave, argp, sizeof(slave));
+ if (copied) {
+ pr_warn("Partial copy from userspace\n");
+ return -EFAULT;
+ }
+
+ /* XXX We do not want to push aspace, cycle and width
+ * to userspace as they are
+ */
+ return vme_slave_set(image[minor].resource,
+ slave.enable, slave.vme_addr, slave.size,
+ image[minor].pci_buf, slave.aspace,
+ slave.cycle);
+
+ break;
+ }
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static long
+vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ int ret;
+ struct inode *inode = file_inode(file);
+ unsigned int minor = iminor(inode);
+
+ mutex_lock(&image[minor].mutex);
+ ret = vme_user_ioctl(inode, file, cmd, arg);
+ mutex_unlock(&image[minor].mutex);
+
+ return ret;
+}
+
+static void vme_user_vm_open(struct vm_area_struct *vma)
+{
+ struct vme_user_vma_priv *vma_priv = vma->vm_private_data;
+
+ refcount_inc(&vma_priv->refcnt);
+}
+
+static void vme_user_vm_close(struct vm_area_struct *vma)
+{
+ struct vme_user_vma_priv *vma_priv = vma->vm_private_data;
+ unsigned int minor = vma_priv->minor;
+
+ if (!refcount_dec_and_test(&vma_priv->refcnt))
+ return;
+
+ mutex_lock(&image[minor].mutex);
+ image[minor].mmap_count--;
+ mutex_unlock(&image[minor].mutex);
+
+ kfree(vma_priv);
+}
+
+static const struct vm_operations_struct vme_user_vm_ops = {
+ .open = vme_user_vm_open,
+ .close = vme_user_vm_close,
+};
+
+static int vme_user_master_mmap(unsigned int minor, struct vm_area_struct *vma)
+{
+ int err;
+ struct vme_user_vma_priv *vma_priv;
+
+ mutex_lock(&image[minor].mutex);
+
+ err = vme_master_mmap(image[minor].resource, vma);
+ if (err) {
+ mutex_unlock(&image[minor].mutex);
+ return err;
+ }
+
+ vma_priv = kmalloc(sizeof(*vma_priv), GFP_KERNEL);
+ if (!vma_priv) {
+ mutex_unlock(&image[minor].mutex);
+ return -ENOMEM;
+ }
+
+ vma_priv->minor = minor;
+ refcount_set(&vma_priv->refcnt, 1);
+ vma->vm_ops = &vme_user_vm_ops;
+ vma->vm_private_data = vma_priv;
+
+ image[minor].mmap_count++;
+
+ mutex_unlock(&image[minor].mutex);
+
+ return 0;
+}
+
+static int vme_user_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ unsigned int minor = iminor(file_inode(file));
+
+ if (type[minor] == MASTER_MINOR)
+ return vme_user_master_mmap(minor, vma);
+
+ return -ENODEV;
+}
+
+static const struct file_operations vme_user_fops = {
+ .read = vme_user_read,
+ .write = vme_user_write,
+ .llseek = vme_user_llseek,
+ .unlocked_ioctl = vme_user_unlocked_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
+ .mmap = vme_user_mmap,
+};
+
+static int vme_user_match(struct vme_dev *vdev)
+{
+ int i;
+
+ int cur_bus = vme_bus_num(vdev);
+ int cur_slot = vme_slot_num(vdev);
+
+ for (i = 0; i < bus_num; i++)
+ if ((cur_bus == bus[i]) && (cur_slot == vdev->num))
+ return 1;
+
+ return 0;
+}
+
+/*
+ * In this simple access driver, the old behaviour is being preserved as much
+ * as practical. We will therefore reserve the buffers and request the images
+ * here so that we don't have to do it later.
+ */
+static int vme_user_probe(struct vme_dev *vdev)
+{
+ int i, err;
+ char *name;
+
+ /* Save pointer to the bridge device */
+ if (vme_user_bridge) {
+ dev_err(&vdev->dev, "Driver can only be loaded for 1 device\n");
+ err = -EINVAL;
+ goto err_dev;
+ }
+ vme_user_bridge = vdev;
+
+ /* Initialise descriptors */
+ for (i = 0; i < VME_DEVS; i++) {
+ image[i].kern_buf = NULL;
+ image[i].pci_buf = 0;
+ mutex_init(&image[i].mutex);
+ image[i].device = NULL;
+ image[i].resource = NULL;
+ }
+
+ /* Assign major and minor numbers for the driver */
+ err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS,
+ driver_name);
+ if (err) {
+ dev_warn(&vdev->dev, "Error getting Major Number %d for driver.\n",
+ VME_MAJOR);
+ goto err_region;
+ }
+
+ /* Register the driver as a char device */
+ vme_user_cdev = cdev_alloc();
+ if (!vme_user_cdev) {
+ err = -ENOMEM;
+ goto err_char;
+ }
+ vme_user_cdev->ops = &vme_user_fops;
+ vme_user_cdev->owner = THIS_MODULE;
+ err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS);
+ if (err)
+ goto err_class;
+
+ /* Request slave resources and allocate buffers (128kB wide) */
+ for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) {
+ /* XXX Need to properly request attributes */
+ /* For ca91cx42 bridge there are only two slave windows
+ * supporting A16 addressing, so we request A24 supported
+ * by all windows.
+ */
+ image[i].resource = vme_slave_request(vme_user_bridge,
+ VME_A24, VME_SCT);
+ if (!image[i].resource) {
+ dev_warn(&vdev->dev,
+ "Unable to allocate slave resource\n");
+ err = -ENOMEM;
+ goto err_slave;
+ }
+ image[i].size_buf = PCI_BUF_SIZE;
+ image[i].kern_buf = vme_alloc_consistent(image[i].resource,
+ image[i].size_buf,
+ &image[i].pci_buf);
+ if (!image[i].kern_buf) {
+ dev_warn(&vdev->dev,
+ "Unable to allocate memory for buffer\n");
+ image[i].pci_buf = 0;
+ vme_slave_free(image[i].resource);
+ err = -ENOMEM;
+ goto err_slave;
+ }
+ }
+
+ /*
+ * Request master resources allocate page sized buffers for small
+ * reads and writes
+ */
+ for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) {
+ /* XXX Need to properly request attributes */
+ image[i].resource = vme_master_request(vme_user_bridge,
+ VME_A32, VME_SCT,
+ VME_D32);
+ if (!image[i].resource) {
+ dev_warn(&vdev->dev,
+ "Unable to allocate master resource\n");
+ err = -ENOMEM;
+ goto err_master;
+ }
+ image[i].size_buf = PCI_BUF_SIZE;
+ image[i].kern_buf = kmalloc(image[i].size_buf, GFP_KERNEL);
+ if (!image[i].kern_buf) {
+ err = -ENOMEM;
+ vme_master_free(image[i].resource);
+ goto err_master;
+ }
+ }
+
+ /* Create sysfs entries - on udev systems this creates the dev files */
+ vme_user_sysfs_class = class_create(THIS_MODULE, driver_name);
+ if (IS_ERR(vme_user_sysfs_class)) {
+ dev_err(&vdev->dev, "Error creating vme_user class.\n");
+ err = PTR_ERR(vme_user_sysfs_class);
+ goto err_master;
+ }
+
+ /* Add sysfs Entries */
+ for (i = 0; i < VME_DEVS; i++) {
+ int num;
+
+ switch (type[i]) {
+ case MASTER_MINOR:
+ name = "bus/vme/m%d";
+ break;
+ case CONTROL_MINOR:
+ name = "bus/vme/ctl";
+ break;
+ case SLAVE_MINOR:
+ name = "bus/vme/s%d";
+ break;
+ default:
+ err = -EINVAL;
+ goto err_sysfs;
+ }
+
+ num = (type[i] == SLAVE_MINOR) ? i - (MASTER_MAX + 1) : i;
+ image[i].device = device_create(vme_user_sysfs_class, NULL,
+ MKDEV(VME_MAJOR, i), NULL,
+ name, num);
+ if (IS_ERR(image[i].device)) {
+ dev_info(&vdev->dev, "Error creating sysfs device\n");
+ err = PTR_ERR(image[i].device);
+ goto err_sysfs;
+ }
+ }
+
+ return 0;
+
+err_sysfs:
+ while (i > 0) {
+ i--;
+ device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i));
+ }
+ class_destroy(vme_user_sysfs_class);
+
+ /* Ensure counter set correctly to unalloc all master windows */
+ i = MASTER_MAX + 1;
+err_master:
+ while (i > MASTER_MINOR) {
+ i--;
+ kfree(image[i].kern_buf);
+ vme_master_free(image[i].resource);
+ }
+
+ /*
+ * Ensure counter set correctly to unalloc all slave windows and buffers
+ */
+ i = SLAVE_MAX + 1;
+err_slave:
+ while (i > SLAVE_MINOR) {
+ i--;
+ vme_free_consistent(image[i].resource, image[i].size_buf,
+ image[i].kern_buf, image[i].pci_buf);
+ vme_slave_free(image[i].resource);
+ }
+err_class:
+ cdev_del(vme_user_cdev);
+err_char:
+ unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
+err_region:
+err_dev:
+ return err;
+}
+
+static void vme_user_remove(struct vme_dev *dev)
+{
+ int i;
+
+ /* Remove sysfs Entries */
+ for (i = 0; i < VME_DEVS; i++) {
+ mutex_destroy(&image[i].mutex);
+ device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i));
+ }
+ class_destroy(vme_user_sysfs_class);
+
+ for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) {
+ kfree(image[i].kern_buf);
+ vme_master_free(image[i].resource);
+ }
+
+ for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) {
+ vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0);
+ vme_free_consistent(image[i].resource, image[i].size_buf,
+ image[i].kern_buf, image[i].pci_buf);
+ vme_slave_free(image[i].resource);
+ }
+
+ /* Unregister device driver */
+ cdev_del(vme_user_cdev);
+
+ /* Unregister the major and minor device numbers */
+ unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
+}
+
+static struct vme_driver vme_user_driver = {
+ .name = driver_name,
+ .match = vme_user_match,
+ .probe = vme_user_probe,
+ .remove = vme_user_remove,
+};
+
+static int __init vme_user_init(void)
+{
+ int retval = 0;
+
+ pr_info("VME User Space Access Driver\n");
+
+ if (bus_num == 0) {
+ pr_err("No cards, skipping registration\n");
+ retval = -ENODEV;
+ goto err_nocard;
+ }
+
+ /* Let's start by supporting one bus, we can support more than one
+ * in future revisions if that ever becomes necessary.
+ */
+ if (bus_num > VME_USER_BUS_MAX) {
+ pr_err("Driver only able to handle %d buses\n",
+ VME_USER_BUS_MAX);
+ bus_num = VME_USER_BUS_MAX;
+ }
+
+ /*
+ * Here we just register the maximum number of devices we can and
+ * leave vme_user_match() to allow only 1 to go through to probe().
+ * This way, if we later want to allow multiple user access devices,
+ * we just change the code in vme_user_match().
+ */
+ retval = vme_register_driver(&vme_user_driver, VME_MAX_SLOTS);
+ if (retval)
+ goto err_reg;
+
+ return retval;
+
+err_reg:
+err_nocard:
+ return retval;
+}
+
+static void __exit vme_user_exit(void)
+{
+ vme_unregister_driver(&vme_user_driver);
+}
+
+MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected");
+module_param_array(bus, int, &bus_num, 0000);
+
+MODULE_DESCRIPTION("VME User Space Access Driver");
+MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com>");
+MODULE_LICENSE("GPL");
+
+module_init(vme_user_init);
+module_exit(vme_user_exit);
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _VME_USER_H_
+#define _VME_USER_H_
+
+#define VME_USER_BUS_MAX 1
+
+/*
+ * VMEbus Master Window Configuration Structure
+ */
+struct vme_master {
+ __u32 enable; /* State of Window */
+ __u64 vme_addr; /* Starting Address on the VMEbus */
+ __u64 size; /* Window Size */
+ __u32 aspace; /* Address Space */
+ __u32 cycle; /* Cycle properties */
+ __u32 dwidth; /* Maximum Data Width */
+#if 0
+ char prefetchenable; /* Prefetch Read Enable State */
+ int prefetchsize; /* Prefetch Read Size (Cache Lines) */
+ char wrpostenable; /* Write Post State */
+#endif
+} __packed;
+
+/*
+ * IOCTL Commands and structures
+ */
+
+/* Magic number for use in ioctls */
+#define VME_IOC_MAGIC 0xAE
+
+/* VMEbus Slave Window Configuration Structure */
+struct vme_slave {
+ __u32 enable; /* State of Window */
+ __u64 vme_addr; /* Starting Address on the VMEbus */
+ __u64 size; /* Window Size */
+ __u32 aspace; /* Address Space */
+ __u32 cycle; /* Cycle properties */
+#if 0
+ char wrpostenable; /* Write Post State */
+ char rmwlock; /* Lock PCI during RMW Cycles */
+ char data64bitcapable; /* non-VMEbus capable of 64-bit Data */
+#endif
+} __packed;
+
+struct vme_irq_id {
+ __u8 level;
+ __u8 statid;
+};
+
+#define VME_GET_SLAVE _IOR(VME_IOC_MAGIC, 1, struct vme_slave)
+#define VME_SET_SLAVE _IOW(VME_IOC_MAGIC, 2, struct vme_slave)
+#define VME_GET_MASTER _IOR(VME_IOC_MAGIC, 3, struct vme_master)
+#define VME_SET_MASTER _IOW(VME_IOC_MAGIC, 4, struct vme_master)
+#define VME_IRQ_GEN _IOW(VME_IOC_MAGIC, 5, struct vme_irq_id)
+
+#endif /* _VME_USER_H_ */
+
projects / linux.git / commitdiff