--- /dev/null
+/*
+ * VME Bridge Framework
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/mm.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/pci.h>
+#include <linux/poll.h>
+#include <linux/highmem.h>
+#include <linux/interrupt.h>
+#include <linux/pagemap.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/syscalls.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/vme.h>
+
+#include "vme_bridge.h"
+
+/* Bitmask and list of registered buses both protected by common mutex */
+static unsigned int vme_bus_numbers;
+static LIST_HEAD(vme_bus_list);
+static DEFINE_MUTEX(vme_buses_lock);
+
+static void __exit vme_exit(void);
+static int __init vme_init(void);
+
+static struct vme_dev *dev_to_vme_dev(struct device *dev)
+{
+ return container_of(dev, struct vme_dev, dev);
+}
+
+/*
+ * Find the bridge that the resource is associated with.
+ */
+static struct vme_bridge *find_bridge(struct vme_resource *resource)
+{
+ /* Get list to search */
+ switch (resource->type) {
+ case VME_MASTER:
+ return list_entry(resource->entry, struct vme_master_resource,
+ list)->parent;
+ break;
+ case VME_SLAVE:
+ return list_entry(resource->entry, struct vme_slave_resource,
+ list)->parent;
+ break;
+ case VME_DMA:
+ return list_entry(resource->entry, struct vme_dma_resource,
+ list)->parent;
+ break;
+ case VME_LM:
+ return list_entry(resource->entry, struct vme_lm_resource,
+ list)->parent;
+ break;
+ default:
+ printk(KERN_ERR "Unknown resource type\n");
+ return NULL;
+ break;
+ }
+}
+
+/*
+ * Allocate a contiguous block of memory for use by the driver. This is used to
+ * create the buffers for the slave windows.
+ */
+void *vme_alloc_consistent(struct vme_resource *resource, size_t size,
+ dma_addr_t *dma)
+{
+ struct vme_bridge *bridge;
+
+ if (resource == NULL) {
+ printk(KERN_ERR "No resource\n");
+ return NULL;
+ }
+
+ bridge = find_bridge(resource);
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find bridge\n");
+ return NULL;
+ }
+
+ if (bridge->parent == NULL) {
+ printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name);
+ return NULL;
+ }
+
+ if (bridge->alloc_consistent == NULL) {
+ printk(KERN_ERR "alloc_consistent not supported by bridge %s\n",
+ bridge->name);
+ return NULL;
+ }
+
+ return bridge->alloc_consistent(bridge->parent, size, dma);
+}
+EXPORT_SYMBOL(vme_alloc_consistent);
+
+/*
+ * Free previously allocated contiguous block of memory.
+ */
+void vme_free_consistent(struct vme_resource *resource, size_t size,
+ void *vaddr, dma_addr_t dma)
+{
+ struct vme_bridge *bridge;
+
+ if (resource == NULL) {
+ printk(KERN_ERR "No resource\n");
+ return;
+ }
+
+ bridge = find_bridge(resource);
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find bridge\n");
+ return;
+ }
+
+ if (bridge->parent == NULL) {
+ printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name);
+ return;
+ }
+
+ if (bridge->free_consistent == NULL) {
+ printk(KERN_ERR "free_consistent not supported by bridge %s\n",
+ bridge->name);
+ return;
+ }
+
+ bridge->free_consistent(bridge->parent, size, vaddr, dma);
+}
+EXPORT_SYMBOL(vme_free_consistent);
+
+size_t vme_get_size(struct vme_resource *resource)
+{
+ int enabled, retval;
+ unsigned long long base, size;
+ dma_addr_t buf_base;
+ u32 aspace, cycle, dwidth;
+
+ switch (resource->type) {
+ case VME_MASTER:
+ retval = vme_master_get(resource, &enabled, &base, &size,
+ &aspace, &cycle, &dwidth);
+
+ return size;
+ break;
+ case VME_SLAVE:
+ retval = vme_slave_get(resource, &enabled, &base, &size,
+ &buf_base, &aspace, &cycle);
+
+ return size;
+ break;
+ case VME_DMA:
+ return 0;
+ break;
+ default:
+ printk(KERN_ERR "Unknown resource type\n");
+ return 0;
+ break;
+ }
+}
+EXPORT_SYMBOL(vme_get_size);
+
+static int vme_check_window(u32 aspace, unsigned long long vme_base,
+ unsigned long long size)
+{
+ int retval = 0;
+
+ switch (aspace) {
+ case VME_A16:
+ if (((vme_base + size) > VME_A16_MAX) ||
+ (vme_base > VME_A16_MAX))
+ retval = -EFAULT;
+ break;
+ case VME_A24:
+ if (((vme_base + size) > VME_A24_MAX) ||
+ (vme_base > VME_A24_MAX))
+ retval = -EFAULT;
+ break;
+ case VME_A32:
+ if (((vme_base + size) > VME_A32_MAX) ||
+ (vme_base > VME_A32_MAX))
+ retval = -EFAULT;
+ break;
+ case VME_A64:
+ /*
+ * Any value held in an unsigned long long can be used as the
+ * base
+ */
+ break;
+ case VME_CRCSR:
+ if (((vme_base + size) > VME_CRCSR_MAX) ||
+ (vme_base > VME_CRCSR_MAX))
+ retval = -EFAULT;
+ break;
+ case VME_USER1:
+ case VME_USER2:
+ case VME_USER3:
+ case VME_USER4:
+ /* User Defined */
+ break;
+ default:
+ printk(KERN_ERR "Invalid address space\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ return retval;
+}
+
+/*
+ * Request a slave image with specific attributes, return some unique
+ * identifier.
+ */
+struct vme_resource *vme_slave_request(struct vme_dev *vdev, u32 address,
+ u32 cycle)
+{
+ struct vme_bridge *bridge;
+ struct list_head *slave_pos = NULL;
+ struct vme_slave_resource *allocated_image = NULL;
+ struct vme_slave_resource *slave_image = NULL;
+ struct vme_resource *resource = NULL;
+
+ bridge = vdev->bridge;
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ goto err_bus;
+ }
+
+ /* Loop through slave resources */
+ list_for_each(slave_pos, &bridge->slave_resources) {
+ slave_image = list_entry(slave_pos,
+ struct vme_slave_resource, list);
+
+ if (slave_image == NULL) {
+ printk(KERN_ERR "Registered NULL Slave resource\n");
+ continue;
+ }
+
+ /* Find an unlocked and compatible image */
+ mutex_lock(&slave_image->mtx);
+ if (((slave_image->address_attr & address) == address) &&
+ ((slave_image->cycle_attr & cycle) == cycle) &&
+ (slave_image->locked == 0)) {
+
+ slave_image->locked = 1;
+ mutex_unlock(&slave_image->mtx);
+ allocated_image = slave_image;
+ break;
+ }
+ mutex_unlock(&slave_image->mtx);
+ }
+
+ /* No free image */
+ if (allocated_image == NULL)
+ goto err_image;
+
+ resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
+ if (resource == NULL) {
+ printk(KERN_WARNING "Unable to allocate resource structure\n");
+ goto err_alloc;
+ }
+ resource->type = VME_SLAVE;
+ resource->entry = &allocated_image->list;
+
+ return resource;
+
+err_alloc:
+ /* Unlock image */
+ mutex_lock(&slave_image->mtx);
+ slave_image->locked = 0;
+ mutex_unlock(&slave_image->mtx);
+err_image:
+err_bus:
+ return NULL;
+}
+EXPORT_SYMBOL(vme_slave_request);
+
+int vme_slave_set(struct vme_resource *resource, int enabled,
+ unsigned long long vme_base, unsigned long long size,
+ dma_addr_t buf_base, u32 aspace, u32 cycle)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_slave_resource *image;
+ int retval;
+
+ if (resource->type != VME_SLAVE) {
+ printk(KERN_ERR "Not a slave resource\n");
+ return -EINVAL;
+ }
+
+ image = list_entry(resource->entry, struct vme_slave_resource, list);
+
+ if (bridge->slave_set == NULL) {
+ printk(KERN_ERR "Function not supported\n");
+ return -ENOSYS;
+ }
+
+ if (!(((image->address_attr & aspace) == aspace) &&
+ ((image->cycle_attr & cycle) == cycle))) {
+ printk(KERN_ERR "Invalid attributes\n");
+ return -EINVAL;
+ }
+
+ retval = vme_check_window(aspace, vme_base, size);
+ if (retval)
+ return retval;
+
+ return bridge->slave_set(image, enabled, vme_base, size, buf_base,
+ aspace, cycle);
+}
+EXPORT_SYMBOL(vme_slave_set);
+
+int vme_slave_get(struct vme_resource *resource, int *enabled,
+ unsigned long long *vme_base, unsigned long long *size,
+ dma_addr_t *buf_base, u32 *aspace, u32 *cycle)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_slave_resource *image;
+
+ if (resource->type != VME_SLAVE) {
+ printk(KERN_ERR "Not a slave resource\n");
+ return -EINVAL;
+ }
+
+ image = list_entry(resource->entry, struct vme_slave_resource, list);
+
+ if (bridge->slave_get == NULL) {
+ printk(KERN_ERR "vme_slave_get not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->slave_get(image, enabled, vme_base, size, buf_base,
+ aspace, cycle);
+}
+EXPORT_SYMBOL(vme_slave_get);
+
+void vme_slave_free(struct vme_resource *resource)
+{
+ struct vme_slave_resource *slave_image;
+
+ if (resource->type != VME_SLAVE) {
+ printk(KERN_ERR "Not a slave resource\n");
+ return;
+ }
+
+ slave_image = list_entry(resource->entry, struct vme_slave_resource,
+ list);
+ if (slave_image == NULL) {
+ printk(KERN_ERR "Can't find slave resource\n");
+ return;
+ }
+
+ /* Unlock image */
+ mutex_lock(&slave_image->mtx);
+ if (slave_image->locked == 0)
+ printk(KERN_ERR "Image is already free\n");
+
+ slave_image->locked = 0;
+ mutex_unlock(&slave_image->mtx);
+
+ /* Free up resource memory */
+ kfree(resource);
+}
+EXPORT_SYMBOL(vme_slave_free);
+
+/*
+ * Request a master image with specific attributes, return some unique
+ * identifier.
+ */
+struct vme_resource *vme_master_request(struct vme_dev *vdev, u32 address,
+ u32 cycle, u32 dwidth)
+{
+ struct vme_bridge *bridge;
+ struct list_head *master_pos = NULL;
+ struct vme_master_resource *allocated_image = NULL;
+ struct vme_master_resource *master_image = NULL;
+ struct vme_resource *resource = NULL;
+
+ bridge = vdev->bridge;
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ goto err_bus;
+ }
+
+ /* Loop through master resources */
+ list_for_each(master_pos, &bridge->master_resources) {
+ master_image = list_entry(master_pos,
+ struct vme_master_resource, list);
+
+ if (master_image == NULL) {
+ printk(KERN_WARNING "Registered NULL master resource\n");
+ continue;
+ }
+
+ /* Find an unlocked and compatible image */
+ spin_lock(&master_image->lock);
+ if (((master_image->address_attr & address) == address) &&
+ ((master_image->cycle_attr & cycle) == cycle) &&
+ ((master_image->width_attr & dwidth) == dwidth) &&
+ (master_image->locked == 0)) {
+
+ master_image->locked = 1;
+ spin_unlock(&master_image->lock);
+ allocated_image = master_image;
+ break;
+ }
+ spin_unlock(&master_image->lock);
+ }
+
+ /* Check to see if we found a resource */
+ if (allocated_image == NULL) {
+ printk(KERN_ERR "Can't find a suitable resource\n");
+ goto err_image;
+ }
+
+ resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
+ if (resource == NULL) {
+ printk(KERN_ERR "Unable to allocate resource structure\n");
+ goto err_alloc;
+ }
+ resource->type = VME_MASTER;
+ resource->entry = &allocated_image->list;
+
+ return resource;
+
+err_alloc:
+ /* Unlock image */
+ spin_lock(&master_image->lock);
+ master_image->locked = 0;
+ spin_unlock(&master_image->lock);
+err_image:
+err_bus:
+ return NULL;
+}
+EXPORT_SYMBOL(vme_master_request);
+
+int vme_master_set(struct vme_resource *resource, int enabled,
+ unsigned long long vme_base, unsigned long long size, u32 aspace,
+ u32 cycle, u32 dwidth)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_master_resource *image;
+ int retval;
+
+ if (resource->type != VME_MASTER) {
+ printk(KERN_ERR "Not a master resource\n");
+ return -EINVAL;
+ }
+
+ image = list_entry(resource->entry, struct vme_master_resource, list);
+
+ if (bridge->master_set == NULL) {
+ printk(KERN_WARNING "vme_master_set not supported\n");
+ return -EINVAL;
+ }
+
+ if (!(((image->address_attr & aspace) == aspace) &&
+ ((image->cycle_attr & cycle) == cycle) &&
+ ((image->width_attr & dwidth) == dwidth))) {
+ printk(KERN_WARNING "Invalid attributes\n");
+ return -EINVAL;
+ }
+
+ retval = vme_check_window(aspace, vme_base, size);
+ if (retval)
+ return retval;
+
+ return bridge->master_set(image, enabled, vme_base, size, aspace,
+ cycle, dwidth);
+}
+EXPORT_SYMBOL(vme_master_set);
+
+int vme_master_get(struct vme_resource *resource, int *enabled,
+ unsigned long long *vme_base, unsigned long long *size, u32 *aspace,
+ u32 *cycle, u32 *dwidth)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_master_resource *image;
+
+ if (resource->type != VME_MASTER) {
+ printk(KERN_ERR "Not a master resource\n");
+ return -EINVAL;
+ }
+
+ image = list_entry(resource->entry, struct vme_master_resource, list);
+
+ if (bridge->master_get == NULL) {
+ printk(KERN_WARNING "%s not supported\n", __func__);
+ return -EINVAL;
+ }
+
+ return bridge->master_get(image, enabled, vme_base, size, aspace,
+ cycle, dwidth);
+}
+EXPORT_SYMBOL(vme_master_get);
+
+/*
+ * Read data out of VME space into a buffer.
+ */
+ssize_t vme_master_read(struct vme_resource *resource, void *buf, size_t count,
+ loff_t offset)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_master_resource *image;
+ size_t length;
+
+ if (bridge->master_read == NULL) {
+ printk(KERN_WARNING "Reading from resource not supported\n");
+ return -EINVAL;
+ }
+
+ if (resource->type != VME_MASTER) {
+ printk(KERN_ERR "Not a master resource\n");
+ return -EINVAL;
+ }
+
+ image = list_entry(resource->entry, struct vme_master_resource, list);
+
+ length = vme_get_size(resource);
+
+ if (offset > length) {
+ printk(KERN_WARNING "Invalid Offset\n");
+ return -EFAULT;
+ }
+
+ if ((offset + count) > length)
+ count = length - offset;
+
+ return bridge->master_read(image, buf, count, offset);
+
+}
+EXPORT_SYMBOL(vme_master_read);
+
+/*
+ * Write data out to VME space from a buffer.
+ */
+ssize_t vme_master_write(struct vme_resource *resource, void *buf,
+ size_t count, loff_t offset)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_master_resource *image;
+ size_t length;
+
+ if (bridge->master_write == NULL) {
+ printk(KERN_WARNING "Writing to resource not supported\n");
+ return -EINVAL;
+ }
+
+ if (resource->type != VME_MASTER) {
+ printk(KERN_ERR "Not a master resource\n");
+ return -EINVAL;
+ }
+
+ image = list_entry(resource->entry, struct vme_master_resource, list);
+
+ length = vme_get_size(resource);
+
+ if (offset > length) {
+ printk(KERN_WARNING "Invalid Offset\n");
+ return -EFAULT;
+ }
+
+ if ((offset + count) > length)
+ count = length - offset;
+
+ return bridge->master_write(image, buf, count, offset);
+}
+EXPORT_SYMBOL(vme_master_write);
+
+/*
+ * Perform RMW cycle to provided location.
+ */
+unsigned int vme_master_rmw(struct vme_resource *resource, unsigned int mask,
+ unsigned int compare, unsigned int swap, loff_t offset)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_master_resource *image;
+
+ if (bridge->master_rmw == NULL) {
+ printk(KERN_WARNING "Writing to resource not supported\n");
+ return -EINVAL;
+ }
+
+ if (resource->type != VME_MASTER) {
+ printk(KERN_ERR "Not a master resource\n");
+ return -EINVAL;
+ }
+
+ image = list_entry(resource->entry, struct vme_master_resource, list);
+
+ return bridge->master_rmw(image, mask, compare, swap, offset);
+}
+EXPORT_SYMBOL(vme_master_rmw);
+
+int vme_master_mmap(struct vme_resource *resource, struct vm_area_struct *vma)
+{
+ struct vme_master_resource *image;
+ phys_addr_t phys_addr;
+ unsigned long vma_size;
+
+ if (resource->type != VME_MASTER) {
+ pr_err("Not a master resource\n");
+ return -EINVAL;
+ }
+
+ image = list_entry(resource->entry, struct vme_master_resource, list);
+ phys_addr = image->bus_resource.start + (vma->vm_pgoff << PAGE_SHIFT);
+ vma_size = vma->vm_end - vma->vm_start;
+
+ if (phys_addr + vma_size > image->bus_resource.end + 1) {
+ pr_err("Map size cannot exceed the window size\n");
+ return -EFAULT;
+ }
+
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+ return vm_iomap_memory(vma, phys_addr, vma->vm_end - vma->vm_start);
+}
+EXPORT_SYMBOL(vme_master_mmap);
+
+void vme_master_free(struct vme_resource *resource)
+{
+ struct vme_master_resource *master_image;
+
+ if (resource->type != VME_MASTER) {
+ printk(KERN_ERR "Not a master resource\n");
+ return;
+ }
+
+ master_image = list_entry(resource->entry, struct vme_master_resource,
+ list);
+ if (master_image == NULL) {
+ printk(KERN_ERR "Can't find master resource\n");
+ return;
+ }
+
+ /* Unlock image */
+ spin_lock(&master_image->lock);
+ if (master_image->locked == 0)
+ printk(KERN_ERR "Image is already free\n");
+
+ master_image->locked = 0;
+ spin_unlock(&master_image->lock);
+
+ /* Free up resource memory */
+ kfree(resource);
+}
+EXPORT_SYMBOL(vme_master_free);
+
+/*
+ * Request a DMA controller with specific attributes, return some unique
+ * identifier.
+ */
+struct vme_resource *vme_dma_request(struct vme_dev *vdev, u32 route)
+{
+ struct vme_bridge *bridge;
+ struct list_head *dma_pos = NULL;
+ struct vme_dma_resource *allocated_ctrlr = NULL;
+ struct vme_dma_resource *dma_ctrlr = NULL;
+ struct vme_resource *resource = NULL;
+
+ /* XXX Not checking resource attributes */
+ printk(KERN_ERR "No VME resource Attribute tests done\n");
+
+ bridge = vdev->bridge;
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ goto err_bus;
+ }
+
+ /* Loop through DMA resources */
+ list_for_each(dma_pos, &bridge->dma_resources) {
+ dma_ctrlr = list_entry(dma_pos,
+ struct vme_dma_resource, list);
+
+ if (dma_ctrlr == NULL) {
+ printk(KERN_ERR "Registered NULL DMA resource\n");
+ continue;
+ }
+
+ /* Find an unlocked and compatible controller */
+ mutex_lock(&dma_ctrlr->mtx);
+ if (((dma_ctrlr->route_attr & route) == route) &&
+ (dma_ctrlr->locked == 0)) {
+
+ dma_ctrlr->locked = 1;
+ mutex_unlock(&dma_ctrlr->mtx);
+ allocated_ctrlr = dma_ctrlr;
+ break;
+ }
+ mutex_unlock(&dma_ctrlr->mtx);
+ }
+
+ /* Check to see if we found a resource */
+ if (allocated_ctrlr == NULL)
+ goto err_ctrlr;
+
+ resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
+ if (resource == NULL) {
+ printk(KERN_WARNING "Unable to allocate resource structure\n");
+ goto err_alloc;
+ }
+ resource->type = VME_DMA;
+ resource->entry = &allocated_ctrlr->list;
+
+ return resource;
+
+err_alloc:
+ /* Unlock image */
+ mutex_lock(&dma_ctrlr->mtx);
+ dma_ctrlr->locked = 0;
+ mutex_unlock(&dma_ctrlr->mtx);
+err_ctrlr:
+err_bus:
+ return NULL;
+}
+EXPORT_SYMBOL(vme_dma_request);
+
+/*
+ * Start new list
+ */
+struct vme_dma_list *vme_new_dma_list(struct vme_resource *resource)
+{
+ struct vme_dma_resource *ctrlr;
+ struct vme_dma_list *dma_list;
+
+ if (resource->type != VME_DMA) {
+ printk(KERN_ERR "Not a DMA resource\n");
+ return NULL;
+ }
+
+ ctrlr = list_entry(resource->entry, struct vme_dma_resource, list);
+
+ dma_list = kmalloc(sizeof(struct vme_dma_list), GFP_KERNEL);
+ if (dma_list == NULL) {
+ printk(KERN_ERR "Unable to allocate memory for new dma list\n");
+ return NULL;
+ }
+ INIT_LIST_HEAD(&dma_list->entries);
+ dma_list->parent = ctrlr;
+ mutex_init(&dma_list->mtx);
+
+ return dma_list;
+}
+EXPORT_SYMBOL(vme_new_dma_list);
+
+/*
+ * Create "Pattern" type attributes
+ */
+struct vme_dma_attr *vme_dma_pattern_attribute(u32 pattern, u32 type)
+{
+ struct vme_dma_attr *attributes;
+ struct vme_dma_pattern *pattern_attr;
+
+ attributes = kmalloc(sizeof(struct vme_dma_attr), GFP_KERNEL);
+ if (attributes == NULL) {
+ printk(KERN_ERR "Unable to allocate memory for attributes structure\n");
+ goto err_attr;
+ }
+
+ pattern_attr = kmalloc(sizeof(struct vme_dma_pattern), GFP_KERNEL);
+ if (pattern_attr == NULL) {
+ printk(KERN_ERR "Unable to allocate memory for pattern attributes\n");
+ goto err_pat;
+ }
+
+ attributes->type = VME_DMA_PATTERN;
+ attributes->private = (void *)pattern_attr;
+
+ pattern_attr->pattern = pattern;
+ pattern_attr->type = type;
+
+ return attributes;
+
+err_pat:
+ kfree(attributes);
+err_attr:
+ return NULL;
+}
+EXPORT_SYMBOL(vme_dma_pattern_attribute);
+
+/*
+ * Create "PCI" type attributes
+ */
+struct vme_dma_attr *vme_dma_pci_attribute(dma_addr_t address)
+{
+ struct vme_dma_attr *attributes;
+ struct vme_dma_pci *pci_attr;
+
+ /* XXX Run some sanity checks here */
+
+ attributes = kmalloc(sizeof(struct vme_dma_attr), GFP_KERNEL);
+ if (attributes == NULL) {
+ printk(KERN_ERR "Unable to allocate memory for attributes structure\n");
+ goto err_attr;
+ }
+
+ pci_attr = kmalloc(sizeof(struct vme_dma_pci), GFP_KERNEL);
+ if (pci_attr == NULL) {
+ printk(KERN_ERR "Unable to allocate memory for pci attributes\n");
+ goto err_pci;
+ }
+
+
+
+ attributes->type = VME_DMA_PCI;
+ attributes->private = (void *)pci_attr;
+
+ pci_attr->address = address;
+
+ return attributes;
+
+err_pci:
+ kfree(attributes);
+err_attr:
+ return NULL;
+}
+EXPORT_SYMBOL(vme_dma_pci_attribute);
+
+/*
+ * Create "VME" type attributes
+ */
+struct vme_dma_attr *vme_dma_vme_attribute(unsigned long long address,
+ u32 aspace, u32 cycle, u32 dwidth)
+{
+ struct vme_dma_attr *attributes;
+ struct vme_dma_vme *vme_attr;
+
+ attributes = kmalloc(
+ sizeof(struct vme_dma_attr), GFP_KERNEL);
+ if (attributes == NULL) {
+ printk(KERN_ERR "Unable to allocate memory for attributes structure\n");
+ goto err_attr;
+ }
+
+ vme_attr = kmalloc(sizeof(struct vme_dma_vme), GFP_KERNEL);
+ if (vme_attr == NULL) {
+ printk(KERN_ERR "Unable to allocate memory for vme attributes\n");
+ goto err_vme;
+ }
+
+ attributes->type = VME_DMA_VME;
+ attributes->private = (void *)vme_attr;
+
+ vme_attr->address = address;
+ vme_attr->aspace = aspace;
+ vme_attr->cycle = cycle;
+ vme_attr->dwidth = dwidth;
+
+ return attributes;
+
+err_vme:
+ kfree(attributes);
+err_attr:
+ return NULL;
+}
+EXPORT_SYMBOL(vme_dma_vme_attribute);
+
+/*
+ * Free attribute
+ */
+void vme_dma_free_attribute(struct vme_dma_attr *attributes)
+{
+ kfree(attributes->private);
+ kfree(attributes);
+}
+EXPORT_SYMBOL(vme_dma_free_attribute);
+
+int vme_dma_list_add(struct vme_dma_list *list, struct vme_dma_attr *src,
+ struct vme_dma_attr *dest, size_t count)
+{
+ struct vme_bridge *bridge = list->parent->parent;
+ int retval;
+
+ if (bridge->dma_list_add == NULL) {
+ printk(KERN_WARNING "Link List DMA generation not supported\n");
+ return -EINVAL;
+ }
+
+ if (!mutex_trylock(&list->mtx)) {
+ printk(KERN_ERR "Link List already submitted\n");
+ return -EINVAL;
+ }
+
+ retval = bridge->dma_list_add(list, src, dest, count);
+
+ mutex_unlock(&list->mtx);
+
+ return retval;
+}
+EXPORT_SYMBOL(vme_dma_list_add);
+
+int vme_dma_list_exec(struct vme_dma_list *list)
+{
+ struct vme_bridge *bridge = list->parent->parent;
+ int retval;
+
+ if (bridge->dma_list_exec == NULL) {
+ printk(KERN_ERR "Link List DMA execution not supported\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&list->mtx);
+
+ retval = bridge->dma_list_exec(list);
+
+ mutex_unlock(&list->mtx);
+
+ return retval;
+}
+EXPORT_SYMBOL(vme_dma_list_exec);
+
+int vme_dma_list_free(struct vme_dma_list *list)
+{
+ struct vme_bridge *bridge = list->parent->parent;
+ int retval;
+
+ if (bridge->dma_list_empty == NULL) {
+ printk(KERN_WARNING "Emptying of Link Lists not supported\n");
+ return -EINVAL;
+ }
+
+ if (!mutex_trylock(&list->mtx)) {
+ printk(KERN_ERR "Link List in use\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Empty out all of the entries from the dma list. We need to go to the
+ * low level driver as dma entries are driver specific.
+ */
+ retval = bridge->dma_list_empty(list);
+ if (retval) {
+ printk(KERN_ERR "Unable to empty link-list entries\n");
+ mutex_unlock(&list->mtx);
+ return retval;
+ }
+ mutex_unlock(&list->mtx);
+ kfree(list);
+
+ return retval;
+}
+EXPORT_SYMBOL(vme_dma_list_free);
+
+int vme_dma_free(struct vme_resource *resource)
+{
+ struct vme_dma_resource *ctrlr;
+
+ if (resource->type != VME_DMA) {
+ printk(KERN_ERR "Not a DMA resource\n");
+ return -EINVAL;
+ }
+
+ ctrlr = list_entry(resource->entry, struct vme_dma_resource, list);
+
+ if (!mutex_trylock(&ctrlr->mtx)) {
+ printk(KERN_ERR "Resource busy, can't free\n");
+ return -EBUSY;
+ }
+
+ if (!(list_empty(&ctrlr->pending) && list_empty(&ctrlr->running))) {
+ printk(KERN_WARNING "Resource still processing transfers\n");
+ mutex_unlock(&ctrlr->mtx);
+ return -EBUSY;
+ }
+
+ ctrlr->locked = 0;
+
+ mutex_unlock(&ctrlr->mtx);
+
+ kfree(resource);
+
+ return 0;
+}
+EXPORT_SYMBOL(vme_dma_free);
+
+void vme_irq_handler(struct vme_bridge *bridge, int level, int statid)
+{
+ void (*call)(int, int, void *);
+ void *priv_data;
+
+ call = bridge->irq[level - 1].callback[statid].func;
+ priv_data = bridge->irq[level - 1].callback[statid].priv_data;
+
+ if (call != NULL)
+ call(level, statid, priv_data);
+ else
+ printk(KERN_WARNING "Spurilous VME interrupt, level:%x, vector:%x\n",
+ level, statid);
+}
+EXPORT_SYMBOL(vme_irq_handler);
+
+int vme_irq_request(struct vme_dev *vdev, int level, int statid,
+ void (*callback)(int, int, void *),
+ void *priv_data)
+{
+ struct vme_bridge *bridge;
+
+ bridge = vdev->bridge;
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ return -EINVAL;
+ }
+
+ if ((level < 1) || (level > 7)) {
+ printk(KERN_ERR "Invalid interrupt level\n");
+ return -EINVAL;
+ }
+
+ if (bridge->irq_set == NULL) {
+ printk(KERN_ERR "Configuring interrupts not supported\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&bridge->irq_mtx);
+
+ if (bridge->irq[level - 1].callback[statid].func) {
+ mutex_unlock(&bridge->irq_mtx);
+ printk(KERN_WARNING "VME Interrupt already taken\n");
+ return -EBUSY;
+ }
+
+ bridge->irq[level - 1].count++;
+ bridge->irq[level - 1].callback[statid].priv_data = priv_data;
+ bridge->irq[level - 1].callback[statid].func = callback;
+
+ /* Enable IRQ level */
+ bridge->irq_set(bridge, level, 1, 1);
+
+ mutex_unlock(&bridge->irq_mtx);
+
+ return 0;
+}
+EXPORT_SYMBOL(vme_irq_request);
+
+void vme_irq_free(struct vme_dev *vdev, int level, int statid)
+{
+ struct vme_bridge *bridge;
+
+ bridge = vdev->bridge;
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ return;
+ }
+
+ if ((level < 1) || (level > 7)) {
+ printk(KERN_ERR "Invalid interrupt level\n");
+ return;
+ }
+
+ if (bridge->irq_set == NULL) {
+ printk(KERN_ERR "Configuring interrupts not supported\n");
+ return;
+ }
+
+ mutex_lock(&bridge->irq_mtx);
+
+ bridge->irq[level - 1].count--;
+
+ /* Disable IRQ level if no more interrupts attached at this level*/
+ if (bridge->irq[level - 1].count == 0)
+ bridge->irq_set(bridge, level, 0, 1);
+
+ bridge->irq[level - 1].callback[statid].func = NULL;
+ bridge->irq[level - 1].callback[statid].priv_data = NULL;
+
+ mutex_unlock(&bridge->irq_mtx);
+}
+EXPORT_SYMBOL(vme_irq_free);
+
+int vme_irq_generate(struct vme_dev *vdev, int level, int statid)
+{
+ struct vme_bridge *bridge;
+
+ bridge = vdev->bridge;
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ return -EINVAL;
+ }
+
+ if ((level < 1) || (level > 7)) {
+ printk(KERN_WARNING "Invalid interrupt level\n");
+ return -EINVAL;
+ }
+
+ if (bridge->irq_generate == NULL) {
+ printk(KERN_WARNING "Interrupt generation not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->irq_generate(bridge, level, statid);
+}
+EXPORT_SYMBOL(vme_irq_generate);
+
+/*
+ * Request the location monitor, return resource or NULL
+ */
+struct vme_resource *vme_lm_request(struct vme_dev *vdev)
+{
+ struct vme_bridge *bridge;
+ struct list_head *lm_pos = NULL;
+ struct vme_lm_resource *allocated_lm = NULL;
+ struct vme_lm_resource *lm = NULL;
+ struct vme_resource *resource = NULL;
+
+ bridge = vdev->bridge;
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ goto err_bus;
+ }
+
+ /* Loop through DMA resources */
+ list_for_each(lm_pos, &bridge->lm_resources) {
+ lm = list_entry(lm_pos,
+ struct vme_lm_resource, list);
+
+ if (lm == NULL) {
+ printk(KERN_ERR "Registered NULL Location Monitor resource\n");
+ continue;
+ }
+
+ /* Find an unlocked controller */
+ mutex_lock(&lm->mtx);
+ if (lm->locked == 0) {
+ lm->locked = 1;
+ mutex_unlock(&lm->mtx);
+ allocated_lm = lm;
+ break;
+ }
+ mutex_unlock(&lm->mtx);
+ }
+
+ /* Check to see if we found a resource */
+ if (allocated_lm == NULL)
+ goto err_lm;
+
+ resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
+ if (resource == NULL) {
+ printk(KERN_ERR "Unable to allocate resource structure\n");
+ goto err_alloc;
+ }
+ resource->type = VME_LM;
+ resource->entry = &allocated_lm->list;
+
+ return resource;
+
+err_alloc:
+ /* Unlock image */
+ mutex_lock(&lm->mtx);
+ lm->locked = 0;
+ mutex_unlock(&lm->mtx);
+err_lm:
+err_bus:
+ return NULL;
+}
+EXPORT_SYMBOL(vme_lm_request);
+
+int vme_lm_count(struct vme_resource *resource)
+{
+ struct vme_lm_resource *lm;
+
+ if (resource->type != VME_LM) {
+ printk(KERN_ERR "Not a Location Monitor resource\n");
+ return -EINVAL;
+ }
+
+ lm = list_entry(resource->entry, struct vme_lm_resource, list);
+
+ return lm->monitors;
+}
+EXPORT_SYMBOL(vme_lm_count);
+
+int vme_lm_set(struct vme_resource *resource, unsigned long long lm_base,
+ u32 aspace, u32 cycle)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_lm_resource *lm;
+
+ if (resource->type != VME_LM) {
+ printk(KERN_ERR "Not a Location Monitor resource\n");
+ return -EINVAL;
+ }
+
+ lm = list_entry(resource->entry, struct vme_lm_resource, list);
+
+ if (bridge->lm_set == NULL) {
+ printk(KERN_ERR "vme_lm_set not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->lm_set(lm, lm_base, aspace, cycle);
+}
+EXPORT_SYMBOL(vme_lm_set);
+
+int vme_lm_get(struct vme_resource *resource, unsigned long long *lm_base,
+ u32 *aspace, u32 *cycle)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_lm_resource *lm;
+
+ if (resource->type != VME_LM) {
+ printk(KERN_ERR "Not a Location Monitor resource\n");
+ return -EINVAL;
+ }
+
+ lm = list_entry(resource->entry, struct vme_lm_resource, list);
+
+ if (bridge->lm_get == NULL) {
+ printk(KERN_ERR "vme_lm_get not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->lm_get(lm, lm_base, aspace, cycle);
+}
+EXPORT_SYMBOL(vme_lm_get);
+
+int vme_lm_attach(struct vme_resource *resource, int monitor,
+ void (*callback)(int))
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_lm_resource *lm;
+
+ if (resource->type != VME_LM) {
+ printk(KERN_ERR "Not a Location Monitor resource\n");
+ return -EINVAL;
+ }
+
+ lm = list_entry(resource->entry, struct vme_lm_resource, list);
+
+ if (bridge->lm_attach == NULL) {
+ printk(KERN_ERR "vme_lm_attach not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->lm_attach(lm, monitor, callback);
+}
+EXPORT_SYMBOL(vme_lm_attach);
+
+int vme_lm_detach(struct vme_resource *resource, int monitor)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_lm_resource *lm;
+
+ if (resource->type != VME_LM) {
+ printk(KERN_ERR "Not a Location Monitor resource\n");
+ return -EINVAL;
+ }
+
+ lm = list_entry(resource->entry, struct vme_lm_resource, list);
+
+ if (bridge->lm_detach == NULL) {
+ printk(KERN_ERR "vme_lm_detach not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->lm_detach(lm, monitor);
+}
+EXPORT_SYMBOL(vme_lm_detach);
+
+void vme_lm_free(struct vme_resource *resource)
+{
+ struct vme_lm_resource *lm;
+
+ if (resource->type != VME_LM) {
+ printk(KERN_ERR "Not a Location Monitor resource\n");
+ return;
+ }
+
+ lm = list_entry(resource->entry, struct vme_lm_resource, list);
+
+ mutex_lock(&lm->mtx);
+
+ /* XXX
+ * Check to see that there aren't any callbacks still attached, if
+ * there are we should probably be detaching them!
+ */
+
+ lm->locked = 0;
+
+ mutex_unlock(&lm->mtx);
+
+ kfree(resource);
+}
+EXPORT_SYMBOL(vme_lm_free);
+
+int vme_slot_num(struct vme_dev *vdev)
+{
+ struct vme_bridge *bridge;
+
+ bridge = vdev->bridge;
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ return -EINVAL;
+ }
+
+ if (bridge->slot_get == NULL) {
+ printk(KERN_WARNING "vme_slot_num not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->slot_get(bridge);
+}
+EXPORT_SYMBOL(vme_slot_num);
+
+int vme_bus_num(struct vme_dev *vdev)
+{
+ struct vme_bridge *bridge;
+
+ bridge = vdev->bridge;
+ if (bridge == NULL) {
+ pr_err("Can't find VME bus\n");
+ return -EINVAL;
+ }
+
+ return bridge->num;
+}
+EXPORT_SYMBOL(vme_bus_num);
+
+/* - Bridge Registration --------------------------------------------------- */
+
+static void vme_dev_release(struct device *dev)
+{
+ kfree(dev_to_vme_dev(dev));
+}
+
+int vme_register_bridge(struct vme_bridge *bridge)
+{
+ int i;
+ int ret = -1;
+
+ mutex_lock(&vme_buses_lock);
+ for (i = 0; i < sizeof(vme_bus_numbers) * 8; i++) {
+ if ((vme_bus_numbers & (1 << i)) == 0) {
+ vme_bus_numbers |= (1 << i);
+ bridge->num = i;
+ INIT_LIST_HEAD(&bridge->devices);
+ list_add_tail(&bridge->bus_list, &vme_bus_list);
+ ret = 0;
+ break;
+ }
+ }
+ mutex_unlock(&vme_buses_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL(vme_register_bridge);
+
+void vme_unregister_bridge(struct vme_bridge *bridge)
+{
+ struct vme_dev *vdev;
+ struct vme_dev *tmp;
+
+ mutex_lock(&vme_buses_lock);
+ vme_bus_numbers &= ~(1 << bridge->num);
+ list_for_each_entry_safe(vdev, tmp, &bridge->devices, bridge_list) {
+ list_del(&vdev->drv_list);
+ list_del(&vdev->bridge_list);
+ device_unregister(&vdev->dev);
+ }
+ list_del(&bridge->bus_list);
+ mutex_unlock(&vme_buses_lock);
+}
+EXPORT_SYMBOL(vme_unregister_bridge);
+
+/* - Driver Registration --------------------------------------------------- */
+
+static int __vme_register_driver_bus(struct vme_driver *drv,
+ struct vme_bridge *bridge, unsigned int ndevs)
+{
+ int err;
+ unsigned int i;
+ struct vme_dev *vdev;
+ struct vme_dev *tmp;
+
+ for (i = 0; i < ndevs; i++) {
+ vdev = kzalloc(sizeof(struct vme_dev), GFP_KERNEL);
+ if (!vdev) {
+ err = -ENOMEM;
+ goto err_devalloc;
+ }
+ vdev->num = i;
+ vdev->bridge = bridge;
+ vdev->dev.platform_data = drv;
+ vdev->dev.release = vme_dev_release;
+ vdev->dev.parent = bridge->parent;
+ vdev->dev.bus = &vme_bus_type;
+ dev_set_name(&vdev->dev, "%s.%u-%u", drv->name, bridge->num,
+ vdev->num);
+
+ err = device_register(&vdev->dev);
+ if (err)
+ goto err_reg;
+
+ if (vdev->dev.platform_data) {
+ list_add_tail(&vdev->drv_list, &drv->devices);
+ list_add_tail(&vdev->bridge_list, &bridge->devices);
+ } else
+ device_unregister(&vdev->dev);
+ }
+ return 0;
+
+err_reg:
+ put_device(&vdev->dev);
+ kfree(vdev);
+err_devalloc:
+ list_for_each_entry_safe(vdev, tmp, &drv->devices, drv_list) {
+ list_del(&vdev->drv_list);
+ list_del(&vdev->bridge_list);
+ device_unregister(&vdev->dev);
+ }
+ return err;
+}
+
+static int __vme_register_driver(struct vme_driver *drv, unsigned int ndevs)
+{
+ struct vme_bridge *bridge;
+ int err = 0;
+
+ mutex_lock(&vme_buses_lock);
+ list_for_each_entry(bridge, &vme_bus_list, bus_list) {
+ /*
+ * This cannot cause trouble as we already have vme_buses_lock
+ * and if the bridge is removed, it will have to go through
+ * vme_unregister_bridge() to do it (which calls remove() on
+ * the bridge which in turn tries to acquire vme_buses_lock and
+ * will have to wait).
+ */
+ err = __vme_register_driver_bus(drv, bridge, ndevs);
+ if (err)
+ break;
+ }
+ mutex_unlock(&vme_buses_lock);
+ return err;
+}
+
+int vme_register_driver(struct vme_driver *drv, unsigned int ndevs)
+{
+ int err;
+
+ drv->driver.name = drv->name;
+ drv->driver.bus = &vme_bus_type;
+ INIT_LIST_HEAD(&drv->devices);
+
+ err = driver_register(&drv->driver);
+ if (err)
+ return err;
+
+ err = __vme_register_driver(drv, ndevs);
+ if (err)
+ driver_unregister(&drv->driver);
+
+ return err;
+}
+EXPORT_SYMBOL(vme_register_driver);
+
+void vme_unregister_driver(struct vme_driver *drv)
+{
+ struct vme_dev *dev, *dev_tmp;
+
+ mutex_lock(&vme_buses_lock);
+ list_for_each_entry_safe(dev, dev_tmp, &drv->devices, drv_list) {
+ list_del(&dev->drv_list);
+ list_del(&dev->bridge_list);
+ device_unregister(&dev->dev);
+ }
+ mutex_unlock(&vme_buses_lock);
+
+ driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL(vme_unregister_driver);
+
+/* - Bus Registration ------------------------------------------------------ */
+
+static int vme_bus_match(struct device *dev, struct device_driver *drv)
+{
+ struct vme_driver *vme_drv;
+
+ vme_drv = container_of(drv, struct vme_driver, driver);
+
+ if (dev->platform_data == vme_drv) {
+ struct vme_dev *vdev = dev_to_vme_dev(dev);
+
+ if (vme_drv->match && vme_drv->match(vdev))
+ return 1;
+
+ dev->platform_data = NULL;
+ }
+ return 0;
+}
+
+static int vme_bus_probe(struct device *dev)
+{
+ int retval = -ENODEV;
+ struct vme_driver *driver;
+ struct vme_dev *vdev = dev_to_vme_dev(dev);
+
+ driver = dev->platform_data;
+
+ if (driver->probe != NULL)
+ retval = driver->probe(vdev);
+
+ return retval;
+}
+
+static int vme_bus_remove(struct device *dev)
+{
+ int retval = -ENODEV;
+ struct vme_driver *driver;
+ struct vme_dev *vdev = dev_to_vme_dev(dev);
+
+ driver = dev->platform_data;
+
+ if (driver->remove != NULL)
+ retval = driver->remove(vdev);
+
+ return retval;
+}
+
+struct bus_type vme_bus_type = {
+ .name = "vme",
+ .match = vme_bus_match,
+ .probe = vme_bus_probe,
+ .remove = vme_bus_remove,
+};
+EXPORT_SYMBOL(vme_bus_type);
+
+static int __init vme_init(void)
+{
+ return bus_register(&vme_bus_type);
+}
+
+static void __exit vme_exit(void)
+{
+ bus_unregister(&vme_bus_type);
+}
+
+subsys_initcall(vme_init);
+module_exit(vme_exit);
Code Review / kvmfornfv.git / blobdiff