Staging: VME Framework for the Linux Kernel
This framework aims to colelese, extend and improve the VME Linux
drivers found at vmelinux.org, universe2.sourceforge.net and
openfmi.net/frs/?group_id=144. The last 2 drivers appear to be forks of
the original code found at vmelinux.org though have extended the
codebase.
Signed-off-by: Martyn Welch <martyn.welch@gefanuc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/vme/vme.c b/drivers/staging/vme/vme.c
new file mode 100644
index 0000000..8ee1192
--- /dev/null
+++ b/drivers/staging/vme/vme.c
@@ -0,0 +1,1371 @@
+/*
+ * VME Bridge Framework
+ *
+ * Author: Martyn Welch <martyn.welch@gefanuc.com>
+ * Copyright 2008 GE Fanuc 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/version.h>
+#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/semaphore.h>
+#include <linux/spinlock.h>
+
+#include "vme.h"
+#include "vme_bridge.h"
+
+/* Bitmask and semaphore to keep track of bridge numbers */
+static unsigned int vme_bus_numbers;
+DECLARE_MUTEX(vme_bus_num_sem);
+
+static void __exit vme_exit (void);
+static int __init vme_init (void);
+
+
+/*
+ * Find the bridge resource associated with a specific device resource
+ */
+static struct vme_bridge *dev_to_bridge(struct device *dev)
+{
+ return dev->platform_data;
+}
+
+/*
+ * 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;
+ 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.
+ *
+ * XXX VME bridges could be available on buses other than PCI. At the momment
+ * this framework only supports PCI devices.
+ */
+void * vme_alloc_consistent(struct vme_resource *resource, size_t size,
+ dma_addr_t *dma)
+{
+ struct vme_bridge *bridge;
+ struct pci_dev *pdev;
+
+ if(resource == NULL) {
+ printk("No resource\n");
+ return NULL;
+ }
+
+ bridge = find_bridge(resource);
+ if(bridge == NULL) {
+ printk("Can't find bridge\n");
+ return NULL;
+ }
+
+ /* Find pci_dev container of dev */
+ if (bridge->parent == NULL) {
+ printk("Dev entry NULL\n");
+ return NULL;
+ }
+ pdev = container_of(bridge->parent, struct pci_dev, dev);
+
+ return pci_alloc_consistent(pdev, size, dma);
+}
+EXPORT_SYMBOL(vme_alloc_consistent);
+
+/*
+ * Free previously allocated contiguous block of memory.
+ *
+ * XXX VME bridges could be available on buses other than PCI. At the momment
+ * this framework only supports PCI devices.
+ */
+void vme_free_consistent(struct vme_resource *resource, size_t size,
+ void *vaddr, dma_addr_t dma)
+{
+ struct vme_bridge *bridge;
+ struct pci_dev *pdev;
+
+ if(resource == NULL) {
+ printk("No resource\n");
+ return;
+ }
+
+ bridge = find_bridge(resource);
+ if(bridge == NULL) {
+ printk("Can't find bridge\n");
+ return;
+ }
+
+ /* Find pci_dev container of dev */
+ pdev = container_of(bridge->parent, struct pci_dev, dev);
+
+ pci_free_consistent(pdev, 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;
+ vme_address_t aspace;
+ vme_cycle_t cycle;
+ vme_width_t 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(vme_address_t 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("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 device *dev,
+ vme_address_t address, vme_cycle_t 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 = dev_to_bridge(dev);
+ 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("Registered NULL Slave resource\n");
+ continue;
+ }
+
+ /* Find an unlocked and compatible image */
+ down(&(slave_image->sem));
+ if(((slave_image->address_attr & address) == address) &&
+ ((slave_image->cycle_attr & cycle) == cycle) &&
+ (slave_image->locked == 0)) {
+
+ slave_image->locked = 1;
+ up(&(slave_image->sem));
+ allocated_image = slave_image;
+ break;
+ }
+ up(&(slave_image->sem));
+ }
+
+ /* 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 */
+ down(&(slave_image->sem));
+ slave_image->locked = 0;
+ up(&(slave_image->sem));
+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, vme_address_t aspace, vme_cycle_t cycle)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_slave_resource *image;
+ int retval;
+
+ if (resource->type != VME_SLAVE) {
+ printk("Not a slave resource\n");
+ return -EINVAL;
+ }
+
+ image = list_entry(resource->entry, struct vme_slave_resource, list);
+
+ if (bridge->slave_set == NULL) {
+ printk("Function not supported\n");
+ return -ENOSYS;
+ }
+
+ if(!(((image->address_attr & aspace) == aspace) &&
+ ((image->cycle_attr & cycle) == cycle))) {
+ printk("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, vme_address_t *aspace, vme_cycle_t *cycle)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_slave_resource *image;
+
+ if (resource->type != VME_SLAVE) {
+ printk("Not a slave resource\n");
+ return -EINVAL;
+ }
+
+ image = list_entry(resource->entry, struct vme_slave_resource, list);
+
+ if (bridge->slave_set == NULL) {
+ printk("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("Not a slave resource\n");
+ return;
+ }
+
+ slave_image = list_entry(resource->entry, struct vme_slave_resource,
+ list);
+ if (slave_image == NULL) {
+ printk("Can't find slave resource\n");
+ return;
+ }
+
+ /* Unlock image */
+ down(&(slave_image->sem));
+ if (slave_image->locked == 0)
+ printk(KERN_ERR "Image is already free\n");
+
+ slave_image->locked = 0;
+ up(&(slave_image->sem));
+
+ /* 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 device *dev,
+ vme_address_t address, vme_cycle_t cycle, vme_width_t 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 = dev_to_bridge(dev);
+ 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;
+
+ kfree(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,
+ vme_address_t aspace, vme_cycle_t cycle, vme_width_t dwidth)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_master_resource *image;
+ int retval;
+
+ if (resource->type != VME_MASTER) {
+ printk("Not a master resource\n");
+ return -EINVAL;
+ }
+
+ image = list_entry(resource->entry, struct vme_master_resource, list);
+
+ if (bridge->master_set == NULL) {
+ printk("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("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,
+ vme_address_t *aspace, vme_cycle_t *cycle, vme_width_t *dwidth)
+{
+ struct vme_bridge *bridge = find_bridge(resource);
+ struct vme_master_resource *image;
+
+ if (resource->type != VME_MASTER) {
+ printk("Not a master resource\n");
+ return -EINVAL;
+ }
+
+ image = list_entry(resource->entry, struct vme_master_resource, list);
+
+ if (bridge->master_set == NULL) {
+ printk("vme_master_set not supported\n");
+ 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("Reading from resource not supported\n");
+ return -EINVAL;
+ }
+
+ if (resource->type != VME_MASTER) {
+ printk("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("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("Writing to resource not supported\n");
+ return -EINVAL;
+ }
+
+ if (resource->type != VME_MASTER) {
+ printk("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("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("Writing to resource not supported\n");
+ return -EINVAL;
+ }
+
+ if (resource->type != VME_MASTER) {
+ printk("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);
+
+void vme_master_free(struct vme_resource *resource)
+{
+ struct vme_master_resource *master_image;
+
+ if (resource->type != VME_MASTER) {
+ printk("Not a master resource\n");
+ return;
+ }
+
+ master_image = list_entry(resource->entry, struct vme_master_resource,
+ list);
+ if (master_image == NULL) {
+ printk("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_request_dma(struct device *dev)
+{
+ 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 = dev_to_bridge(dev);
+ 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("Registered NULL DMA resource\n");
+ continue;
+ }
+
+ /* Find an unlocked controller */
+ down(&(dma_ctrlr->sem));
+ if(dma_ctrlr->locked == 0) {
+ dma_ctrlr->locked = 1;
+ up(&(dma_ctrlr->sem));
+ allocated_ctrlr = dma_ctrlr;
+ break;
+ }
+ up(&(dma_ctrlr->sem));
+ }
+
+ /* 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 */
+ down(&(dma_ctrlr->sem));
+ dma_ctrlr->locked = 0;
+ up(&(dma_ctrlr->sem));
+err_ctrlr:
+err_bus:
+ return NULL;
+}
+EXPORT_SYMBOL(vme_request_dma);
+
+/*
+ * 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("Not a DMA resource\n");
+ return NULL;
+ }
+
+ ctrlr = list_entry(resource->entry, struct vme_dma_resource, list);
+
+ dma_list = (struct vme_dma_list *)kmalloc(
+ sizeof(struct vme_dma_list), GFP_KERNEL);
+ if(dma_list == NULL) {
+ printk("Unable to allocate memory for new dma list\n");
+ return NULL;
+ }
+ INIT_LIST_HEAD(&(dma_list->entries));
+ dma_list->parent = ctrlr;
+ init_MUTEX(&(dma_list->sem));
+
+ return dma_list;
+}
+EXPORT_SYMBOL(vme_new_dma_list);
+
+/*
+ * Create "Pattern" type attributes
+ */
+struct vme_dma_attr *vme_dma_pattern_attribute(u32 pattern,
+ vme_pattern_t type)
+{
+ struct vme_dma_attr *attributes;
+ struct vme_dma_pattern *pattern_attr;
+
+ attributes = (struct vme_dma_attr *)kmalloc(
+ sizeof(struct vme_dma_attr), GFP_KERNEL);
+ if(attributes == NULL) {
+ printk("Unable to allocate memory for attributes structure\n");
+ goto err_attr;
+ }
+
+ pattern_attr = (struct vme_dma_pattern *)kmalloc(
+ sizeof(struct vme_dma_pattern), GFP_KERNEL);
+ if(pattern_attr == NULL) {
+ printk("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;
+
+ kfree(pattern_attr);
+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 = (struct vme_dma_attr *)kmalloc(
+ sizeof(struct vme_dma_attr), GFP_KERNEL);
+ if(attributes == NULL) {
+ printk("Unable to allocate memory for attributes structure\n");
+ goto err_attr;
+ }
+
+ pci_attr = (struct vme_dma_pci *)kmalloc(sizeof(struct vme_dma_pci),
+ GFP_KERNEL);
+ if(pci_attr == NULL) {
+ printk("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;
+
+ kfree(pci_attr);
+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,
+ vme_address_t aspace, vme_cycle_t cycle, vme_width_t dwidth)
+{
+ struct vme_dma_attr *attributes;
+ struct vme_dma_vme *vme_attr;
+
+ /* XXX Run some sanity checks here */
+
+ attributes = (struct vme_dma_attr *)kmalloc(
+ sizeof(struct vme_dma_attr), GFP_KERNEL);
+ if(attributes == NULL) {
+ printk("Unable to allocate memory for attributes structure\n");
+ goto err_attr;
+ }
+
+ vme_attr = (struct vme_dma_vme *)kmalloc(sizeof(struct vme_dma_vme),
+ GFP_KERNEL);
+ if(vme_attr == NULL) {
+ printk("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;
+
+ kfree(vme_attr);
+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("Link List DMA generation not supported\n");
+ return -EINVAL;
+ }
+
+ if (down_trylock(&(list->sem))) {
+ printk("Link List already submitted\n");
+ return -EINVAL;
+ }
+
+ retval = bridge->dma_list_add(list, src, dest, count);
+
+ up(&(list->sem));
+
+ 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("Link List DMA execution not supported\n");
+ return -EINVAL;
+ }
+
+ down(&(list->sem));
+
+ retval = bridge->dma_list_exec(list);
+
+ up(&(list->sem));
+
+ 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("Emptying of Link Lists not supported\n");
+ return -EINVAL;
+ }
+
+ if (down_trylock(&(list->sem))) {
+ printk("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("Unable to empty link-list entries\n");
+ up(&(list->sem));
+ return retval;
+ }
+ up(&(list->sem));
+ 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("Not a DMA resource\n");
+ return -EINVAL;
+ }
+
+ ctrlr = list_entry(resource->entry, struct vme_dma_resource, list);
+
+ if (down_trylock(&(ctrlr->sem))) {
+ printk("Resource busy, can't free\n");
+ return -EBUSY;
+ }
+
+ if (!(list_empty(&(ctrlr->pending)) && list_empty(&(ctrlr->running)))) {
+ printk("Resource still processing transfers\n");
+ up(&(ctrlr->sem));
+ return -EBUSY;
+ }
+
+ ctrlr->locked = 0;
+
+ up(&(ctrlr->sem));
+
+ return 0;
+}
+EXPORT_SYMBOL(vme_dma_free);
+
+int vme_request_irq(struct device *dev, int level, int statid,
+ void (*callback)(int level, int vector, void *priv_data),
+ void *priv_data)
+{
+ struct vme_bridge *bridge;
+
+ bridge = dev_to_bridge(dev);
+ 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->request_irq == NULL) {
+ printk("Registering interrupts not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->request_irq(level, statid, callback, priv_data);
+}
+EXPORT_SYMBOL(vme_request_irq);
+
+void vme_free_irq(struct device *dev, int level, int statid)
+{
+ struct vme_bridge *bridge;
+
+ bridge = dev_to_bridge(dev);
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ return;
+ }
+
+ if((level < 1) || (level > 7)) {
+ printk(KERN_WARNING "Invalid interrupt level\n");
+ return;
+ }
+
+ if (bridge->free_irq == NULL) {
+ printk("Freeing interrupts not supported\n");
+ return;
+ }
+
+ bridge->free_irq(level, statid);
+}
+EXPORT_SYMBOL(vme_free_irq);
+
+int vme_generate_irq(struct device *dev, int level, int statid)
+{
+ struct vme_bridge *bridge;
+
+ bridge = dev_to_bridge(dev);
+ 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->generate_irq == NULL) {
+ printk("Interrupt generation not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->generate_irq(level, statid);
+}
+EXPORT_SYMBOL(vme_generate_irq);
+
+int vme_lm_set(struct device *dev, unsigned long long lm_base, vme_address_t aspace,
+ vme_cycle_t cycle)
+{
+ struct vme_bridge *bridge;
+
+ bridge = dev_to_bridge(dev);
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ return -EINVAL;
+ }
+
+ if (bridge->lm_set == NULL) {
+ printk("vme_lm_set not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->lm_set(lm_base, aspace, cycle);
+}
+EXPORT_SYMBOL(vme_lm_set);
+
+int vme_lm_get(struct device *dev, unsigned long long *lm_base, vme_address_t *aspace,
+ vme_cycle_t *cycle)
+{
+ struct vme_bridge *bridge;
+
+ bridge = dev_to_bridge(dev);
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ return -EINVAL;
+ }
+
+ if (bridge->lm_get == NULL) {
+ printk("vme_lm_get not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->lm_get(lm_base, aspace, cycle);
+}
+EXPORT_SYMBOL(vme_lm_get);
+
+int vme_lm_attach(struct device *dev, int monitor, void (*callback)(int))
+{
+ struct vme_bridge *bridge;
+
+ bridge = dev_to_bridge(dev);
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ return -EINVAL;
+ }
+
+ if (bridge->lm_attach == NULL) {
+ printk("vme_lm_attach not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->lm_attach(monitor, callback);
+}
+EXPORT_SYMBOL(vme_lm_attach);
+
+int vme_lm_detach(struct device *dev, int monitor)
+{
+ struct vme_bridge *bridge;
+
+ bridge = dev_to_bridge(dev);
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ return -EINVAL;
+ }
+
+ if (bridge->lm_detach == NULL) {
+ printk("vme_lm_detach not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->lm_detach(monitor);
+}
+EXPORT_SYMBOL(vme_lm_detach);
+
+int vme_slot_get(struct device *bus)
+{
+ struct vme_bridge *bridge;
+
+ bridge = dev_to_bridge(bus);
+ if (bridge == NULL) {
+ printk(KERN_ERR "Can't find VME bus\n");
+ return -EINVAL;
+ }
+
+ if (bridge->slot_get == NULL) {
+ printk("vme_slot_get not supported\n");
+ return -EINVAL;
+ }
+
+ return bridge->slot_get();
+}
+EXPORT_SYMBOL(vme_slot_get);
+
+
+/* - Bridge Registration --------------------------------------------------- */
+
+static int vme_alloc_bus_num(void)
+{
+ int i;
+
+ down(&vme_bus_num_sem);
+ for (i = 0; i < sizeof(vme_bus_numbers) * 8; i++) {
+ if (((vme_bus_numbers >> i) & 0x1) == 0) {
+ vme_bus_numbers |= (0x1 << i);
+ break;
+ }
+ }
+ up(&vme_bus_num_sem);
+
+ return i;
+}
+
+static void vme_free_bus_num(int bus)
+{
+ down(&vme_bus_num_sem);
+ vme_bus_numbers |= ~(0x1 << bus);
+ up(&vme_bus_num_sem);
+}
+
+int vme_register_bridge (struct vme_bridge *bridge)
+{
+ struct device *dev;
+ int retval;
+ int i;
+
+ bridge->num = vme_alloc_bus_num();
+
+ /* This creates 32 vme "slot" devices. This equates to a slot for each
+ * ID available in a system conforming to the ANSI/VITA 1-1994
+ * specification.
+ */
+ for (i = 0; i < VME_SLOTS_MAX; i++) {
+ dev = &(bridge->dev[i]);
+ memset(dev, 0, sizeof(struct device));
+
+ dev->parent = bridge->parent;
+ dev->bus = &(vme_bus_type);
+ /*
+ * We save a pointer to the bridge in platform_data so that we
+ * can get to it later. We keep driver_data for use by the
+ * driver that binds against the slot
+ */
+ dev->platform_data = bridge;
+ dev_set_name(dev, "vme-%x.%x", bridge->num, i + 1);
+
+ retval = device_register(dev);
+ if(retval)
+ goto err_reg;
+ }
+
+ return retval;
+
+ i = VME_SLOTS_MAX;
+err_reg:
+ while (i > -1) {
+ dev = &(bridge->dev[i]);
+ device_unregister(dev);
+ }
+ vme_free_bus_num(bridge->num);
+ return retval;
+}
+EXPORT_SYMBOL(vme_register_bridge);
+
+void vme_unregister_bridge (struct vme_bridge *bridge)
+{
+ int i;
+ struct device *dev;
+
+
+ for (i = 0; i < VME_SLOTS_MAX; i++) {
+ dev = &(bridge->dev[i]);
+ device_unregister(dev);
+ }
+ vme_free_bus_num(bridge->num);
+}
+EXPORT_SYMBOL(vme_unregister_bridge);
+
+
+/* - Driver Registration --------------------------------------------------- */
+
+int vme_register_driver (struct vme_driver *drv)
+{
+ drv->driver.name = drv->name;
+ drv->driver.bus = &vme_bus_type;
+
+ return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL(vme_register_driver);
+
+void vme_unregister_driver (struct vme_driver *drv)
+{
+ driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL(vme_unregister_driver);
+
+/* - Bus Registration ------------------------------------------------------ */
+
+int vme_calc_slot(struct device *dev)
+{
+ struct vme_bridge *bridge;
+ int num;
+
+ bridge = dev_to_bridge(dev);
+
+ /* Determine slot number */
+ num = 0;
+ while(num < VME_SLOTS_MAX) {
+ if(&(bridge->dev[num]) == dev) {
+ break;
+ }
+ num++;
+ }
+ if (num == VME_SLOTS_MAX) {
+ dev_err(dev, "Failed to identify slot\n");
+ num = 0;
+ goto err_dev;
+ }
+ num++;
+
+err_dev:
+ return num;
+}
+
+static struct vme_driver *dev_to_vme_driver(struct device *dev)
+{
+ if(dev->driver == NULL)
+ printk("Bugger dev->driver is NULL\n");
+
+ return container_of(dev->driver, struct vme_driver, driver);
+}
+
+static int vme_bus_match(struct device *dev, struct device_driver *drv)
+{
+ struct vme_bridge *bridge;
+ struct vme_driver *driver;
+ int i, num;
+
+ bridge = dev_to_bridge(dev);
+ driver = container_of(drv, struct vme_driver, driver);
+
+ num = vme_calc_slot(dev);
+ if (!num)
+ goto err_dev;
+
+ if (driver->bind_table == NULL) {
+ dev_err(dev, "Bind table NULL\n");
+ goto err_table;
+ }
+
+ i = 0;
+ while((driver->bind_table[i].bus != 0) ||
+ (driver->bind_table[i].slot != 0)) {
+
+ if ((bridge->num == driver->bind_table[i].bus) &&
+ (num == driver->bind_table[i].slot))
+ return 1;
+ i++;
+ }
+
+err_dev:
+err_table:
+ return 0;
+}
+
+static int vme_bus_probe(struct device *dev)
+{
+ struct vme_bridge *bridge;
+ struct vme_driver *driver;
+ int retval = -ENODEV;
+
+ driver = dev_to_vme_driver(dev);
+ bridge = dev_to_bridge(dev);
+
+ if(driver->probe != NULL) {
+ retval = driver->probe(dev, bridge->num, vme_calc_slot(dev));
+ }
+
+ return retval;
+}
+
+static int vme_bus_remove(struct device *dev)
+{
+ struct vme_bridge *bridge;
+ struct vme_driver *driver;
+ int retval = -ENODEV;
+
+ driver = dev_to_vme_driver(dev);
+ bridge = dev_to_bridge(dev);
+
+ if(driver->remove != NULL) {
+ retval = driver->remove(dev, bridge->num, vme_calc_slot(dev));
+ }
+
+ 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);
+}
+
+MODULE_DESCRIPTION("VME bridge driver framework");
+MODULE_AUTHOR("Martyn Welch <martyn.welch@gefanuc.com");
+MODULE_LICENSE("GPL");
+
+module_init(vme_init);
+module_exit(vme_exit);