// SPDX-License-Identifier: GPL-2.0+
|
/*
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* VMEbus User access driver
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*
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* Author: Martyn Welch <martyn.welch@ge.com>
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* Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
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*
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* Based on work by:
|
* Tom Armistead and Ajit Prem
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* Copyright 2004 Motorola Inc.
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*/
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|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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|
#include <linux/refcount.h>
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#include <linux/cdev.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/ioctl.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/pagemap.h>
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#include <linux/pci.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/syscalls.h>
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#include <linux/types.h>
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|
#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <linux/vme.h>
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#include "vme_user.h"
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|
static const char driver_name[] = "vme_user";
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|
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 */
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struct mutex mutex; /* Mutex for locking image */
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struct device *device; /* Sysfs device */
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struct vme_resource *resource; /* VME resource */
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int mmap_count; /* Number of current mmap's */
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};
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|
static struct image_desc image[VME_DEVS];
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|
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 = MINOR(file_inode(file)->i_rdev);
|
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 = MINOR(file_inode(file)->i_rdev);
|
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 = MINOR(file_inode(file)->i_rdev);
|
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;
|
}
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|
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 = MINOR(inode->i_rdev);
|
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;
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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 = MINOR(inode->i_rdev);
|
|
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 = MINOR(file_inode(file)->i_rdev);
|
|
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 = vme_user_unlocked_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 int 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);
|
|
return 0;
|
}
|
|
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);
|
