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linux/drivers/vme/vme.c
Stefano Babic 9797484ba8 VME: restore bus_remove function causing incomplete module unload 
Commit 050c3d52cc ("vme: make core
vme support explicitly non-modular") dropped the remove function
because it appeared as if it was for removal of the bus, which is
not supported.

However, vme_bus_remove() is called when a VME device is removed
from the bus and not when the bus is removed; as it calls the VME
device driver's cleanup function.  Without this function, the
remove() in the VME device driver is never called and VME device
drivers cannot be reloaded again.

Here we restore the remove function that was deleted in that
commit, and the reference to the function in the bus structure.

Fixes: 050c3d52cc ("vme: make core vme support explicitly non-modular")
Cc: Manohar Vanga <manohar.vanga@gmail.com>
Acked-by: Martyn Welch <martyn@welchs.me.uk>
Cc: devel@driverdev.osuosl.org
Signed-off-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: stable <stable@vger.kernel.org> # 4.9
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-01-25 11:41:44 +01:00

1655 lines
37 KiB
C
Raw Blame History

/*
* 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/init.h>
#include <linux/export.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 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);
if (retval)
return 0;
return size;
break;
case VME_SLAVE:
retval = vme_slave_get(resource, &enabled, &base, &size,
&buf_base, &aspace, &cycle);
if (retval)
return 0;
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);
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:
if ((size != 0) && (vme_base > U64_MAX + 1 - size))
retval = -EFAULT;
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;
}
EXPORT_SYMBOL(vme_check_window);
static u32 vme_get_aspace(int am)
{
switch (am) {
case 0x29:
case 0x2D:
return VME_A16;
case 0x38:
case 0x39:
case 0x3A:
case 0x3B:
case 0x3C:
case 0x3D:
case 0x3E:
case 0x3F:
return VME_A24;
case 0x8:
case 0x9:
case 0xA:
case 0xB:
case 0xC:
case 0xD:
case 0xE:
case 0xF:
return VME_A32;
case 0x0:
case 0x1:
case 0x3:
return VME_A64;
}
return 0;
}
/*
* 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_bus_error_handler(struct vme_bridge *bridge,
unsigned long long address, int am)
{
struct list_head *handler_pos = NULL;
struct vme_error_handler *handler;
int handler_triggered = 0;
u32 aspace = vme_get_aspace(am);
list_for_each(handler_pos, &bridge->vme_error_handlers) {
handler = list_entry(handler_pos, struct vme_error_handler,
list);
if ((aspace == handler->aspace) &&
(address >= handler->start) &&
(address < handler->end)) {
if (!handler->num_errors)
handler->first_error = address;
if (handler->num_errors != UINT_MAX)
handler->num_errors++;
handler_triggered = 1;
}
}
if (!handler_triggered)
dev_err(bridge->parent,
"Unhandled VME access error at address 0x%llx\n",
address);
}
EXPORT_SYMBOL(vme_bus_error_handler);
struct vme_error_handler *vme_register_error_handler(
struct vme_bridge *bridge, u32 aspace,
unsigned long long address, size_t len)
{
struct vme_error_handler *handler;
handler = kmalloc(sizeof(*handler), GFP_KERNEL);
if (!handler)
return NULL;
handler->aspace = aspace;
handler->start = address;
handler->end = address + len;
handler->num_errors = 0;
handler->first_error = 0;
list_add_tail(&handler->list, &bridge->vme_error_handlers);
return handler;
}
EXPORT_SYMBOL(vme_register_error_handler);
void vme_unregister_error_handler(struct vme_error_handler *handler)
{
list_del(&handler->list);
kfree(handler);
}
EXPORT_SYMBOL(vme_unregister_error_handler);
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 "Spurious 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)(void *), void *data)
{
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, data);
}
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));
}
/* Common bridge initialization */
struct vme_bridge *vme_init_bridge(struct vme_bridge *bridge)
{
INIT_LIST_HEAD(&bridge->vme_error_handlers);
INIT_LIST_HEAD(&bridge->master_resources);
INIT_LIST_HEAD(&bridge->slave_resources);
INIT_LIST_HEAD(&bridge->dma_resources);
INIT_LIST_HEAD(&bridge->lm_resources);
mutex_init(&bridge->irq_mtx);
return bridge;
}
EXPORT_SYMBOL(vme_init_bridge);
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);
}
subsys_initcall(vme_init);
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