| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * 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. |
| */ |
| |
| #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; |
| case VME_SLAVE: |
| return list_entry(resource->entry, struct vme_slave_resource, |
| list)->parent; |
| case VME_DMA: |
| return list_entry(resource->entry, struct vme_dma_resource, |
| list)->parent; |
| case VME_LM: |
| return list_entry(resource->entry, struct vme_lm_resource, |
| list)->parent; |
| default: |
| printk(KERN_ERR "Unknown resource type\n"); |
| return NULL; |
| } |
| } |
| |
| /** |
| * vme_alloc_consistent - Allocate contiguous memory. |
| * @resource: Pointer to VME resource. |
| * @size: Size of allocation required. |
| * @dma: Pointer to variable to store physical address of allocation. |
| * |
| * Allocate a contiguous block of memory for use by the driver. This is used to |
| * create the buffers for the slave windows. |
| * |
| * Return: Virtual address of allocation on success, NULL on failure. |
| */ |
| void *vme_alloc_consistent(struct vme_resource *resource, size_t size, |
| dma_addr_t *dma) |
| { |
| struct vme_bridge *bridge; |
| |
| if (!resource) { |
| printk(KERN_ERR "No resource\n"); |
| return NULL; |
| } |
| |
| bridge = find_bridge(resource); |
| if (!bridge) { |
| printk(KERN_ERR "Can't find bridge\n"); |
| return NULL; |
| } |
| |
| if (!bridge->parent) { |
| printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name); |
| return NULL; |
| } |
| |
| if (!bridge->alloc_consistent) { |
| 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); |
| |
| /** |
| * vme_free_consistent - Free previously allocated memory. |
| * @resource: Pointer to VME resource. |
| * @size: Size of allocation to free. |
| * @vaddr: Virtual address of allocation. |
| * @dma: Physical address of allocation. |
| * |
| * Free previously allocated block of contiguous memory. |
| */ |
| void vme_free_consistent(struct vme_resource *resource, size_t size, |
| void *vaddr, dma_addr_t dma) |
| { |
| struct vme_bridge *bridge; |
| |
| if (!resource) { |
| printk(KERN_ERR "No resource\n"); |
| return; |
| } |
| |
| bridge = find_bridge(resource); |
| if (!bridge) { |
| printk(KERN_ERR "Can't find bridge\n"); |
| return; |
| } |
| |
| if (!bridge->parent) { |
| printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name); |
| return; |
| } |
| |
| if (!bridge->free_consistent) { |
| 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); |
| |
| /** |
| * vme_get_size - Helper function returning size of a VME window |
| * @resource: Pointer to VME slave or master resource. |
| * |
| * Determine the size of the VME window provided. This is a helper |
| * function, wrappering the call to vme_master_get or vme_slave_get |
| * depending on the type of window resource handed to it. |
| * |
| * Return: Size of the window on success, zero on failure. |
| */ |
| 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; |
| case VME_SLAVE: |
| retval = vme_slave_get(resource, &enabled, &base, &size, |
| &buf_base, &aspace, &cycle); |
| if (retval) |
| return 0; |
| |
| return size; |
| case VME_DMA: |
| return 0; |
| default: |
| printk(KERN_ERR "Unknown resource type\n"); |
| return 0; |
| } |
| } |
| EXPORT_SYMBOL(vme_get_size); |
| |
| int vme_check_window(u32 aspace, unsigned long long vme_base, |
| unsigned long long size) |
| { |
| int retval = 0; |
| |
| if (vme_base + size < size) |
| return -EINVAL; |
| |
| switch (aspace) { |
| case VME_A16: |
| if (vme_base + size > VME_A16_MAX) |
| retval = -EFAULT; |
| break; |
| case VME_A24: |
| if (vme_base + size > VME_A24_MAX) |
| retval = -EFAULT; |
| break; |
| case VME_A32: |
| if (vme_base + size > VME_A32_MAX) |
| retval = -EFAULT; |
| break; |
| case VME_A64: |
| /* The VME_A64_MAX limit is actually U64_MAX + 1 */ |
| break; |
| case VME_CRCSR: |
| if (vme_base + size > 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; |
| } |
| |
| /** |
| * vme_slave_request - Request a VME slave window resource. |
| * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. |
| * @address: Required VME address space. |
| * @cycle: Required VME data transfer cycle type. |
| * |
| * Request use of a VME window resource capable of being set for the requested |
| * address space and data transfer cycle. |
| * |
| * Return: Pointer to VME resource on success, NULL on failure. |
| */ |
| 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) { |
| 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) { |
| 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) |
| goto err_image; |
| |
| resource = kmalloc(sizeof(*resource), GFP_KERNEL); |
| if (!resource) |
| 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); |
| |
| /** |
| * vme_slave_set - Set VME slave window configuration. |
| * @resource: Pointer to VME slave resource. |
| * @enabled: State to which the window should be configured. |
| * @vme_base: Base address for the window. |
| * @size: Size of the VME window. |
| * @buf_base: Based address of buffer used to provide VME slave window storage. |
| * @aspace: VME address space for the VME window. |
| * @cycle: VME data transfer cycle type for the VME window. |
| * |
| * Set configuration for provided VME slave window. |
| * |
| * Return: Zero on success, -EINVAL if operation is not supported on this |
| * device, if an invalid resource has been provided or invalid |
| * attributes are provided. Hardware specific errors may also be |
| * returned. |
| */ |
| 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) { |
| 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); |
| |
| /** |
| * vme_slave_get - Retrieve VME slave window configuration. |
| * @resource: Pointer to VME slave resource. |
| * @enabled: Pointer to variable for storing state. |
| * @vme_base: Pointer to variable for storing window base address. |
| * @size: Pointer to variable for storing window size. |
| * @buf_base: Pointer to variable for storing slave buffer base address. |
| * @aspace: Pointer to variable for storing VME address space. |
| * @cycle: Pointer to variable for storing VME data transfer cycle type. |
| * |
| * Return configuration for provided VME slave window. |
| * |
| * Return: Zero on success, -EINVAL if operation is not supported on this |
| * device or if an invalid resource has been provided. |
| */ |
| 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) { |
| 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); |
| |
| /** |
| * vme_slave_free - Free VME slave window |
| * @resource: Pointer to VME slave resource. |
| * |
| * Free the provided slave resource so that it may be reallocated. |
| */ |
| 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) { |
| 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); |
| |
| /** |
| * vme_master_request - Request a VME master window resource. |
| * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. |
| * @address: Required VME address space. |
| * @cycle: Required VME data transfer cycle type. |
| * @dwidth: Required VME data transfer width. |
| * |
| * Request use of a VME window resource capable of being set for the requested |
| * address space, data transfer cycle and width. |
| * |
| * Return: Pointer to VME resource on success, NULL on failure. |
| */ |
| 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) { |
| 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) { |
| 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) { |
| printk(KERN_ERR "Can't find a suitable resource\n"); |
| goto err_image; |
| } |
| |
| resource = kmalloc(sizeof(*resource), GFP_KERNEL); |
| if (!resource) |
| 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); |
| |
| /** |
| * vme_master_set - Set VME master window configuration. |
| * @resource: Pointer to VME master resource. |
| * @enabled: State to which the window should be configured. |
| * @vme_base: Base address for the window. |
| * @size: Size of the VME window. |
| * @aspace: VME address space for the VME window. |
| * @cycle: VME data transfer cycle type for the VME window. |
| * @dwidth: VME data transfer width for the VME window. |
| * |
| * Set configuration for provided VME master window. |
| * |
| * Return: Zero on success, -EINVAL if operation is not supported on this |
| * device, if an invalid resource has been provided or invalid |
| * attributes are provided. Hardware specific errors may also be |
| * returned. |
| */ |
| 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) { |
| 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); |
| |
| /** |
| * vme_master_get - Retrieve VME master window configuration. |
| * @resource: Pointer to VME master resource. |
| * @enabled: Pointer to variable for storing state. |
| * @vme_base: Pointer to variable for storing window base address. |
| * @size: Pointer to variable for storing window size. |
| * @aspace: Pointer to variable for storing VME address space. |
| * @cycle: Pointer to variable for storing VME data transfer cycle type. |
| * @dwidth: Pointer to variable for storing VME data transfer width. |
| * |
| * Return configuration for provided VME master window. |
| * |
| * Return: Zero on success, -EINVAL if operation is not supported on this |
| * device or if an invalid resource has been provided. |
| */ |
| 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) { |
| 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); |
| |
| /** |
| * vme_master_read - Read data from VME space into a buffer. |
| * @resource: Pointer to VME master resource. |
| * @buf: Pointer to buffer where data should be transferred. |
| * @count: Number of bytes to transfer. |
| * @offset: Offset into VME master window at which to start transfer. |
| * |
| * Perform read of count bytes of data from location on VME bus which maps into |
| * the VME master window at offset to buf. |
| * |
| * Return: Number of bytes read, -EINVAL if resource is not a VME master |
| * resource or read operation is not supported. -EFAULT returned if |
| * invalid offset is provided. Hardware specific errors may also be |
| * returned. |
| */ |
| 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) { |
| 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); |
| |
| /** |
| * vme_master_write - Write data out to VME space from a buffer. |
| * @resource: Pointer to VME master resource. |
| * @buf: Pointer to buffer holding data to transfer. |
| * @count: Number of bytes to transfer. |
| * @offset: Offset into VME master window at which to start transfer. |
| * |
| * Perform write of count bytes of data from buf to location on VME bus which |
| * maps into the VME master window at offset. |
| * |
| * Return: Number of bytes written, -EINVAL if resource is not a VME master |
| * resource or write operation is not supported. -EFAULT returned if |
| * invalid offset is provided. Hardware specific errors may also be |
| * returned. |
| */ |
| 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) { |
| 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); |
| |
| /** |
| * vme_master_rmw - Perform read-modify-write cycle. |
| * @resource: Pointer to VME master resource. |
| * @mask: Bits to be compared and swapped in operation. |
| * @compare: Bits to be compared with data read from offset. |
| * @swap: Bits to be swapped in data read from offset. |
| * @offset: Offset into VME master window at which to perform operation. |
| * |
| * Perform read-modify-write cycle on provided location: |
| * - Location on VME bus is read. |
| * - Bits selected by mask are compared with compare. |
| * - Where a selected bit matches that in compare and are selected in swap, |
| * the bit is swapped. |
| * - Result written back to location on VME bus. |
| * |
| * Return: Bytes written on success, -EINVAL if resource is not a VME master |
| * resource or RMW operation is not supported. Hardware specific |
| * errors may also be returned. |
| */ |
| 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) { |
| 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); |
| |
| /** |
| * vme_master_mmap - Mmap region of VME master window. |
| * @resource: Pointer to VME master resource. |
| * @vma: Pointer to definition of user mapping. |
| * |
| * Memory map a region of the VME master window into user space. |
| * |
| * Return: Zero on success, -EINVAL if resource is not a VME master |
| * resource or -EFAULT if map exceeds window size. Other generic mmap |
| * errors may also be returned. |
| */ |
| 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); |
| |
| /** |
| * vme_master_free - Free VME master window |
| * @resource: Pointer to VME master resource. |
| * |
| * Free the provided master resource so that it may be reallocated. |
| */ |
| 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) { |
| 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); |
| |
| /** |
| * vme_dma_request - Request a DMA controller. |
| * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. |
| * @route: Required src/destination combination. |
| * |
| * Request a VME DMA controller with capability to perform transfers bewteen |
| * requested source/destination combination. |
| * |
| * Return: Pointer to VME DMA resource on success, NULL on failure. |
| */ |
| 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) { |
| 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) { |
| 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) |
| goto err_ctrlr; |
| |
| resource = kmalloc(sizeof(*resource), GFP_KERNEL); |
| if (!resource) |
| 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); |
| |
| /** |
| * vme_new_dma_list - Create new VME DMA list. |
| * @resource: Pointer to VME DMA resource. |
| * |
| * Create a new VME DMA list. It is the responsibility of the user to free |
| * the list once it is no longer required with vme_dma_list_free(). |
| * |
| * Return: Pointer to new VME DMA list, NULL on allocation failure or invalid |
| * VME DMA resource. |
| */ |
| struct vme_dma_list *vme_new_dma_list(struct vme_resource *resource) |
| { |
| struct vme_dma_list *dma_list; |
| |
| if (resource->type != VME_DMA) { |
| printk(KERN_ERR "Not a DMA resource\n"); |
| return NULL; |
| } |
| |
| dma_list = kmalloc(sizeof(*dma_list), GFP_KERNEL); |
| if (!dma_list) |
| return NULL; |
| |
| INIT_LIST_HEAD(&dma_list->entries); |
| dma_list->parent = list_entry(resource->entry, |
| struct vme_dma_resource, |
| list); |
| mutex_init(&dma_list->mtx); |
| |
| return dma_list; |
| } |
| EXPORT_SYMBOL(vme_new_dma_list); |
| |
| /** |
| * vme_dma_pattern_attribute - Create "Pattern" type VME DMA list attribute. |
| * @pattern: Value to use used as pattern |
| * @type: Type of pattern to be written. |
| * |
| * Create VME DMA list attribute for pattern generation. It is the |
| * responsibility of the user to free used attributes using |
| * vme_dma_free_attribute(). |
| * |
| * Return: Pointer to VME DMA attribute, NULL on failure. |
| */ |
| 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(*attributes), GFP_KERNEL); |
| if (!attributes) |
| goto err_attr; |
| |
| pattern_attr = kmalloc(sizeof(*pattern_attr), GFP_KERNEL); |
| if (!pattern_attr) |
| 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); |
| |
| /** |
| * vme_dma_pci_attribute - Create "PCI" type VME DMA list attribute. |
| * @address: PCI base address for DMA transfer. |
| * |
| * Create VME DMA list attribute pointing to a location on PCI for DMA |
| * transfers. It is the responsibility of the user to free used attributes |
| * using vme_dma_free_attribute(). |
| * |
| * Return: Pointer to VME DMA attribute, NULL on failure. |
| */ |
| 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(*attributes), GFP_KERNEL); |
| if (!attributes) |
| goto err_attr; |
| |
| pci_attr = kmalloc(sizeof(*pci_attr), GFP_KERNEL); |
| if (!pci_attr) |
| 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); |
| |
| /** |
| * vme_dma_vme_attribute - Create "VME" type VME DMA list attribute. |
| * @address: VME base address for DMA transfer. |
| * @aspace: VME address space to use for DMA transfer. |
| * @cycle: VME bus cycle to use for DMA transfer. |
| * @dwidth: VME data width to use for DMA transfer. |
| * |
| * Create VME DMA list attribute pointing to a location on the VME bus for DMA |
| * transfers. It is the responsibility of the user to free used attributes |
| * using vme_dma_free_attribute(). |
| * |
| * Return: Pointer to VME DMA attribute, NULL on failure. |
| */ |
| 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(*attributes), GFP_KERNEL); |
| if (!attributes) |
| goto err_attr; |
| |
| vme_attr = kmalloc(sizeof(*vme_attr), GFP_KERNEL); |
| if (!vme_attr) |
| 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); |
| |
| /** |
| * vme_dma_free_attribute - Free DMA list attribute. |
| * @attributes: Pointer to DMA list attribute. |
| * |
| * Free VME DMA list attribute. VME DMA list attributes can be safely freed |
| * once vme_dma_list_add() has returned. |
| */ |
| void vme_dma_free_attribute(struct vme_dma_attr *attributes) |
| { |
| kfree(attributes->private); |
| kfree(attributes); |
| } |
| EXPORT_SYMBOL(vme_dma_free_attribute); |
| |
| /** |
| * vme_dma_list_add - Add enty to a VME DMA list. |
| * @list: Pointer to VME list. |
| * @src: Pointer to DMA list attribute to use as source. |
| * @dest: Pointer to DMA list attribute to use as destination. |
| * @count: Number of bytes to transfer. |
| * |
| * Add an entry to the provided VME DMA list. Entry requires pointers to source |
| * and destination DMA attributes and a count. |
| * |
| * Please note, the attributes supported as source and destinations for |
| * transfers are hardware dependent. |
| * |
| * Return: Zero on success, -EINVAL if operation is not supported on this |
| * device or if the link list has already been submitted for execution. |
| * Hardware specific errors also possible. |
| */ |
| 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) { |
| 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); |
| |
| /** |
| * vme_dma_list_exec - Queue a VME DMA list for execution. |
| * @list: Pointer to VME list. |
| * |
| * Queue the provided VME DMA list for execution. The call will return once the |
| * list has been executed. |
| * |
| * Return: Zero on success, -EINVAL if operation is not supported on this |
| * device. Hardware specific errors also possible. |
| */ |
| int vme_dma_list_exec(struct vme_dma_list *list) |
| { |
| struct vme_bridge *bridge = list->parent->parent; |
| int retval; |
| |
| if (!bridge->dma_list_exec) { |
| 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); |
| |
| /** |
| * vme_dma_list_free - Free a VME DMA list. |
| * @list: Pointer to VME list. |
| * |
| * Free the provided DMA list and all its entries. |
| * |
| * Return: Zero on success, -EINVAL on invalid VME resource, -EBUSY if resource |
| * is still in use. Hardware specific errors also possible. |
| */ |
| int vme_dma_list_free(struct vme_dma_list *list) |
| { |
| struct vme_bridge *bridge = list->parent->parent; |
| int retval; |
| |
| if (!bridge->dma_list_empty) { |
| 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 -EBUSY; |
| } |
| |
| /* |
| * 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); |
| |
| /** |
| * vme_dma_free - Free a VME DMA resource. |
| * @resource: Pointer to VME DMA resource. |
| * |
| * Free the provided DMA resource so that it may be reallocated. |
| * |
| * Return: Zero on success, -EINVAL on invalid VME resource, -EBUSY if resource |
| * is still active. |
| */ |
| 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_ATOMIC); |
| 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) |
| call(level, statid, priv_data); |
| else |
| printk(KERN_WARNING "Spurious VME interrupt, level:%x, vector:%x\n", |
| level, statid); |
| } |
| EXPORT_SYMBOL(vme_irq_handler); |
| |
| /** |
| * vme_irq_request - Request a specific VME interrupt. |
| * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. |
| * @level: Interrupt priority being requested. |
| * @statid: Interrupt vector being requested. |
| * @callback: Pointer to callback function called when VME interrupt/vector |
| * received. |
| * @priv_data: Generic pointer that will be passed to the callback function. |
| * |
| * Request callback to be attached as a handler for VME interrupts with provided |
| * level and statid. |
| * |
| * Return: Zero on success, -EINVAL on invalid vme device, level or if the |
| * function is not supported, -EBUSY if the level/statid combination is |
| * already in use. Hardware specific errors also possible. |
| */ |
| 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) { |
| 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) { |
| 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); |
| |
| /** |
| * vme_irq_free - Free a VME interrupt. |
| * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. |
| * @level: Interrupt priority of interrupt being freed. |
| * @statid: Interrupt vector of interrupt being freed. |
| * |
| * Remove previously attached callback from VME interrupt priority/vector. |
| */ |
| void vme_irq_free(struct vme_dev *vdev, int level, int statid) |
| { |
| struct vme_bridge *bridge; |
| |
| bridge = vdev->bridge; |
| if (!bridge) { |
| 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) { |
| 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); |
| |
| /** |
| * vme_irq_generate - Generate VME interrupt. |
| * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. |
| * @level: Interrupt priority at which to assert the interrupt. |
| * @statid: Interrupt vector to associate with the interrupt. |
| * |
| * Generate a VME interrupt of the provided level and with the provided |
| * statid. |
| * |
| * Return: Zero on success, -EINVAL on invalid vme device, level or if the |
| * function is not supported. Hardware specific errors also possible. |
| */ |
| int vme_irq_generate(struct vme_dev *vdev, int level, int statid) |
| { |
| struct vme_bridge *bridge; |
| |
| bridge = vdev->bridge; |
| if (!bridge) { |
| 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) { |
| printk(KERN_WARNING "Interrupt generation not supported\n"); |
| return -EINVAL; |
| } |
| |
| return bridge->irq_generate(bridge, level, statid); |
| } |
| EXPORT_SYMBOL(vme_irq_generate); |
| |
| /** |
| * vme_lm_request - Request a VME location monitor |
| * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. |
| * |
| * Allocate a location monitor resource to the driver. A location monitor |
| * allows the driver to monitor accesses to a contiguous number of |
| * addresses on the VME bus. |
| * |
| * Return: Pointer to a VME resource on success or NULL on failure. |
| */ |
| 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) { |
| printk(KERN_ERR "Can't find VME bus\n"); |
| goto err_bus; |
| } |
| |
| /* Loop through LM resources */ |
| list_for_each(lm_pos, &bridge->lm_resources) { |
| lm = list_entry(lm_pos, |
| struct vme_lm_resource, list); |
| if (!lm) { |
| 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) |
| goto err_lm; |
| |
| resource = kmalloc(sizeof(*resource), GFP_KERNEL); |
| if (!resource) |
| 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); |
| |
| /** |
| * vme_lm_count - Determine number of VME Addresses monitored |
| * @resource: Pointer to VME location monitor resource. |
| * |
| * The number of contiguous addresses monitored is hardware dependent. |
| * Return the number of contiguous addresses monitored by the |
| * location monitor. |
| * |
| * Return: Count of addresses monitored or -EINVAL when provided with an |
| * invalid location monitor resource. |
| */ |
| 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); |
| |
| /** |
| * vme_lm_set - Configure location monitor |
| * @resource: Pointer to VME location monitor resource. |
| * @lm_base: Base address to monitor. |
| * @aspace: VME address space to monitor. |
| * @cycle: VME bus cycle type to monitor. |
| * |
| * Set the base address, address space and cycle type of accesses to be |
| * monitored by the location monitor. |
| * |
| * Return: Zero on success, -EINVAL when provided with an invalid location |
| * monitor resource or function is not supported. Hardware specific |
| * errors may also be returned. |
| */ |
| 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) { |
| 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); |
| |
| /** |
| * vme_lm_get - Retrieve location monitor settings |
| * @resource: Pointer to VME location monitor resource. |
| * @lm_base: Pointer used to output the base address monitored. |
| * @aspace: Pointer used to output the address space monitored. |
| * @cycle: Pointer used to output the VME bus cycle type monitored. |
| * |
| * Retrieve the base address, address space and cycle type of accesses to |
| * be monitored by the location monitor. |
| * |
| * Return: Zero on success, -EINVAL when provided with an invalid location |
| * monitor resource or function is not supported. Hardware specific |
| * errors may also be returned. |
| */ |
| 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) { |
| 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); |
| |
| /** |
| * vme_lm_attach - Provide callback for location monitor address |
| * @resource: Pointer to VME location monitor resource. |
| * @monitor: Offset to which callback should be attached. |
| * @callback: Pointer to callback function called when triggered. |
| * @data: Generic pointer that will be passed to the callback function. |
| * |
| * Attach a callback to the specificed offset into the location monitors |
| * monitored addresses. A generic pointer is provided to allow data to be |
| * passed to the callback when called. |
| * |
| * Return: Zero on success, -EINVAL when provided with an invalid location |
| * monitor resource or function is not supported. Hardware specific |
| * errors may also be returned. |
| */ |
| 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) { |
| printk(KERN_ERR "vme_lm_attach not supported\n"); |
| return -EINVAL; |
| } |
| |
| return bridge->lm_attach(lm, monitor, callback, data); |
| } |
| EXPORT_SYMBOL(vme_lm_attach); |
| |
| /** |
| * vme_lm_detach - Remove callback for location monitor address |
| * @resource: Pointer to VME location monitor resource. |
| * @monitor: Offset to which callback should be removed. |
| * |
| * Remove the callback associated with the specificed offset into the |
| * location monitors monitored addresses. |
| * |
| * Return: Zero on success, -EINVAL when provided with an invalid location |
| * monitor resource or function is not supported. Hardware specific |
| * errors may also be returned. |
| */ |
| 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) { |
| printk(KERN_ERR "vme_lm_detach not supported\n"); |
| return -EINVAL; |
| } |
| |
| return bridge->lm_detach(lm, monitor); |
| } |
| EXPORT_SYMBOL(vme_lm_detach); |
| |
| /** |
| * vme_lm_free - Free allocated VME location monitor |
| * @resource: Pointer to VME location monitor resource. |
| * |
| * Free allocation of a VME location monitor. |
| * |
| * WARNING: This function currently expects that any callbacks that have |
| * been attached to the location monitor have been removed. |
| * |
| * Return: Zero on success, -EINVAL when provided with an invalid location |
| * monitor resource. |
| */ |
| 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); |
| |
| /** |
| * vme_slot_num - Retrieve slot ID |
| * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. |
| * |
| * Retrieve the slot ID associated with the provided VME device. |
| * |
| * Return: The slot ID on success, -EINVAL if VME bridge cannot be determined |
| * or the function is not supported. Hardware specific errors may also |
| * be returned. |
| */ |
| int vme_slot_num(struct vme_dev *vdev) |
| { |
| struct vme_bridge *bridge; |
| |
| bridge = vdev->bridge; |
| if (!bridge) { |
| printk(KERN_ERR "Can't find VME bus\n"); |
| return -EINVAL; |
| } |
| |
| if (!bridge->slot_get) { |
| printk(KERN_WARNING "vme_slot_num not supported\n"); |
| return -EINVAL; |
| } |
| |
| return bridge->slot_get(bridge); |
| } |
| EXPORT_SYMBOL(vme_slot_num); |
| |
| /** |
| * vme_bus_num - Retrieve bus number |
| * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. |
| * |
| * Retrieve the bus enumeration associated with the provided VME device. |
| * |
| * Return: The bus number on success, -EINVAL if VME bridge cannot be |
| * determined. |
| */ |
| int vme_bus_num(struct vme_dev *vdev) |
| { |
| struct vme_bridge *bridge; |
| |
| bridge = vdev->bridge; |
| if (!bridge) { |
| 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(*vdev), 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); |
| 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; |
| } |
| |
| /** |
| * vme_register_driver - Register a VME driver |
| * @drv: Pointer to VME driver structure to register. |
| * @ndevs: Maximum number of devices to allow to be enumerated. |
| * |
| * Register a VME device driver with the VME subsystem. |
| * |
| * Return: Zero on success, error value on registration failure. |
| */ |
| 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); |
| |
| /** |
| * vme_unregister_driver - Unregister a VME driver |
| * @drv: Pointer to VME driver structure to unregister. |
| * |
| * Unregister a VME device driver from the VME subsystem. |
| */ |
| 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) |
| { |
| struct vme_driver *driver; |
| struct vme_dev *vdev = dev_to_vme_dev(dev); |
| |
| driver = dev->platform_data; |
| if (driver->probe) |
| return driver->probe(vdev); |
| |
| return -ENODEV; |
| } |
| |
| static int vme_bus_remove(struct device *dev) |
| { |
| struct vme_driver *driver; |
| struct vme_dev *vdev = dev_to_vme_dev(dev); |
| |
| driver = dev->platform_data; |
| if (driver->remove) |
| return driver->remove(vdev); |
| |
| return -ENODEV; |
| } |
| |
| 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); |