--- /dev/null
+/*
+ * 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.
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/atomic.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/devices.txt 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 users; /* Number of current users */
+ int mmap_count; /* Number of current mmap's */
+};
+static struct image_desc image[VME_DEVS];
+
+struct driver_stats {
+ unsigned long reads;
+ unsigned long writes;
+ unsigned long ioctls;
+ unsigned long irqs;
+ unsigned long berrs;
+ unsigned long dmaerrors;
+ unsigned long timeouts;
+ unsigned long external;
+};
+static struct driver_stats statistics;
+
+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
+ };
+
+
+static int vme_user_open(struct inode *, struct file *);
+static int vme_user_release(struct inode *, struct file *);
+static ssize_t vme_user_read(struct file *, char __user *, size_t, loff_t *);
+static ssize_t vme_user_write(struct file *, const char __user *, size_t,
+ loff_t *);
+static loff_t vme_user_llseek(struct file *, loff_t, int);
+static long vme_user_unlocked_ioctl(struct file *, unsigned int, unsigned long);
+static int vme_user_mmap(struct file *file, struct vm_area_struct *vma);
+
+static void vme_user_vm_open(struct vm_area_struct *vma);
+static void vme_user_vm_close(struct vm_area_struct *vma);
+
+static int vme_user_match(struct vme_dev *);
+static int vme_user_probe(struct vme_dev *);
+static int vme_user_remove(struct vme_dev *);
+
+static const struct file_operations vme_user_fops = {
+ .open = vme_user_open,
+ .release = vme_user_release,
+ .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,
+};
+
+struct vme_user_vma_priv {
+ unsigned int minor;
+ atomic_t refcnt;
+};
+
+static const struct vm_operations_struct vme_user_vm_ops = {
+ .open = vme_user_vm_open,
+ .close = vme_user_vm_close,
+};
+
+
+/*
+ * Reset all the statistic counters
+ */
+static void reset_counters(void)
+{
+ statistics.reads = 0;
+ statistics.writes = 0;
+ statistics.ioctls = 0;
+ statistics.irqs = 0;
+ statistics.berrs = 0;
+ statistics.dmaerrors = 0;
+ statistics.timeouts = 0;
+}
+
+static int vme_user_open(struct inode *inode, struct file *file)
+{
+ int err;
+ unsigned int minor = MINOR(inode->i_rdev);
+
+ mutex_lock(&image[minor].mutex);
+ /* Allow device to be opened if a resource is needed and allocated. */
+ if (minor < CONTROL_MINOR && image[minor].resource == NULL) {
+ pr_err("No resources allocated for device\n");
+ err = -EINVAL;
+ goto err_res;
+ }
+
+ /* Increment user count */
+ image[minor].users++;
+
+ mutex_unlock(&image[minor].mutex);
+
+ return 0;
+
+err_res:
+ mutex_unlock(&image[minor].mutex);
+
+ return err;
+}
+
+static int vme_user_release(struct inode *inode, struct file *file)
+{
+ unsigned int minor = MINOR(inode->i_rdev);
+
+ mutex_lock(&image[minor].mutex);
+
+ /* Decrement user count */
+ image[minor].users--;
+
+ mutex_unlock(&image[minor].mutex);
+
+ return 0;
+}
+
+/*
+ * We are going ot alloc a page during init per window for small transfers.
+ * Small transfers will go VME -> buffer -> user space. Larger (more than a
+ * page) transfers will lock the user space buffer into memory and then
+ * transfer the data directly into the user space buffers.
+ */
+static ssize_t resource_to_user(int minor, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ ssize_t retval;
+ ssize_t copied = 0;
+
+ if (count <= image[minor].size_buf) {
+ /* We copy to kernel buffer */
+ copied = vme_master_read(image[minor].resource,
+ image[minor].kern_buf, count, *ppos);
+ if (copied < 0)
+ return (int)copied;
+
+ retval = __copy_to_user(buf, image[minor].kern_buf,
+ (unsigned long)copied);
+ if (retval != 0) {
+ copied = (copied - retval);
+ pr_info("User copy failed\n");
+ return -EINVAL;
+ }
+
+ } else {
+ /* XXX Need to write this */
+ pr_info("Currently don't support large transfers\n");
+ /* Map in pages from userspace */
+
+ /* Call vme_master_read to do the transfer */
+ return -EINVAL;
+ }
+
+ return copied;
+}
+
+/*
+ * We are going to alloc a page during init per window for small transfers.
+ * Small transfers will go user space -> buffer -> VME. Larger (more than a
+ * page) transfers will lock the user space buffer into memory and then
+ * transfer the data directly from the user space buffers out to VME.
+ */
+static ssize_t resource_from_user(unsigned int minor, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ ssize_t retval;
+ ssize_t copied = 0;
+
+ if (count <= image[minor].size_buf) {
+ retval = __copy_from_user(image[minor].kern_buf, buf,
+ (unsigned long)count);
+ if (retval != 0)
+ copied = (copied - retval);
+ else
+ copied = count;
+
+ copied = vme_master_write(image[minor].resource,
+ image[minor].kern_buf, copied, *ppos);
+ } else {
+ /* XXX Need to write this */
+ pr_info("Currently don't support large transfers\n");
+ /* Map in pages from userspace */
+
+ /* Call vme_master_write to do the transfer */
+ return -EINVAL;
+ }
+
+ return copied;
+}
+
+static ssize_t buffer_to_user(unsigned int minor, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ void *image_ptr;
+ ssize_t retval;
+
+ image_ptr = image[minor].kern_buf + *ppos;
+
+ retval = __copy_to_user(buf, image_ptr, (unsigned long)count);
+ if (retval != 0) {
+ retval = (count - retval);
+ pr_warn("Partial copy to userspace\n");
+ } else
+ retval = count;
+
+ /* Return number of bytes successfully read */
+ return retval;
+}
+
+static ssize_t buffer_from_user(unsigned int minor, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ void *image_ptr;
+ size_t retval;
+
+ image_ptr = image[minor].kern_buf + *ppos;
+
+ retval = __copy_from_user(image_ptr, buf, (unsigned long)count);
+ if (retval != 0) {
+ retval = (count - retval);
+ pr_warn("Partial copy to userspace\n");
+ } else
+ retval = count;
+
+ /* Return number of bytes successfully read */
+ return retval;
+}
+
+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;
+ size_t okcount;
+
+ 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)
+ okcount = image_size - *ppos;
+ else
+ okcount = count;
+
+ switch (type[minor]) {
+ case MASTER_MINOR:
+ retval = resource_to_user(minor, buf, okcount, ppos);
+ break;
+ case SLAVE_MINOR:
+ retval = buffer_to_user(minor, buf, okcount, 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;
+ size_t okcount;
+
+ 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)
+ okcount = image_size - *ppos;
+ else
+ okcount = count;
+
+ switch (type[minor]) {
+ case MASTER_MINOR:
+ retval = resource_from_user(minor, buf, okcount, ppos);
+ break;
+ case SLAVE_MINOR:
+ retval = buffer_from_user(minor, buf, okcount, 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;
+
+ if (minor == CONTROL_MINOR)
+ return -EINVAL;
+
+ 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;
+}
+
+/*
+ * 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;
+
+ statistics.ioctls++;
+
+ switch (type[minor]) {
+ case CONTROL_MINOR:
+ switch (cmd) {
+ case VME_IRQ_GEN:
+ copied = copy_from_user(&irq_req, argp,
+ sizeof(struct vme_irq_id));
+ if (copied != 0) {
+ 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(struct vme_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(struct vme_master));
+ if (copied != 0) {
+ 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 != 0) {
+ 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(struct vme_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(struct vme_slave));
+ if (copied != 0) {
+ 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 != 0) {
+ 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;
+
+ atomic_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 (!atomic_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 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(struct vme_user_vma_priv), GFP_KERNEL);
+ if (vma_priv == NULL) {
+ mutex_unlock(&image[minor].mutex);
+ return -ENOMEM;
+ }
+
+ vma_priv->minor = minor;
+ atomic_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;
+}
+
+
+/*
+ * Unallocate a previously allocated buffer
+ */
+static void buf_unalloc(int num)
+{
+ if (image[num].kern_buf) {
+#ifdef VME_DEBUG
+ pr_debug("UniverseII:Releasing buffer at %p\n",
+ image[num].pci_buf);
+#endif
+
+ vme_free_consistent(image[num].resource, image[num].size_buf,
+ image[num].kern_buf, image[num].pci_buf);
+
+ image[num].kern_buf = NULL;
+ image[num].pci_buf = 0;
+ image[num].size_buf = 0;
+
+#ifdef VME_DEBUG
+ } else {
+ pr_debug("UniverseII: Buffer not allocated\n");
+#endif
+ }
+}
+
+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 != 0)
+ goto err_reg;
+
+ return retval;
+
+err_reg:
+err_nocard:
+ return retval;
+}
+
+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 != NULL) {
+ 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;
+ image[i].users = 0;
+ }
+
+ /* Initialise statistics counters */
+ reset_counters();
+
+ /* 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) {
+ dev_warn(&vdev->dev, "cdev_all failed\n");
+ goto err_char;
+ }
+
+ /* 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 == NULL) {
+ 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 == NULL) {
+ 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 == NULL) {
+ 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 == NULL) {
+ 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_class;
+ }
+
+ /* 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 correcty 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 correcty to unalloc all slave windows and buffers
+ */
+ i = SLAVE_MAX + 1;
+err_slave:
+ while (i > SLAVE_MINOR) {
+ i--;
+ buf_unalloc(i);
+ 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);
+ buf_unalloc(i);
+ vme_slave_free(image[i].resource);
+ }
+
+ /* Unregister device driver */
+ cdev_del(vme_user_cdev);
+
+ /* Unregiser the major and minor device numbers */
+ unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
+
+ return 0;
+}
+
+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, 0);
+
+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);
Code Review / kvmfornfv.git / blobdiff