diff options
Diffstat (limited to 'drivers/firewire/fw-iso.c')
| -rw-r--r-- | drivers/firewire/fw-iso.c | 327 |
1 files changed, 0 insertions, 327 deletions
diff --git a/drivers/firewire/fw-iso.c b/drivers/firewire/fw-iso.c deleted file mode 100644 index 2baf1007253e..000000000000 --- a/drivers/firewire/fw-iso.c +++ /dev/null @@ -1,327 +0,0 @@ -/* - * Isochronous I/O functionality: - * - Isochronous DMA context management - * - Isochronous bus resource management (channels, bandwidth), client side - * - * Copyright (C) 2006 Kristian Hoegsberg <krh@bitplanet.net> - * - * 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. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software Foundation, - * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ - -#include <linux/dma-mapping.h> -#include <linux/errno.h> -#include <linux/firewire-constants.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/spinlock.h> -#include <linux/vmalloc.h> - -#include "fw-topology.h" -#include "fw-transaction.h" - -/* - * Isochronous DMA context management - */ - -int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card, - int page_count, enum dma_data_direction direction) -{ - int i, j; - dma_addr_t address; - - buffer->page_count = page_count; - buffer->direction = direction; - - buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]), - GFP_KERNEL); - if (buffer->pages == NULL) - goto out; - - for (i = 0; i < buffer->page_count; i++) { - buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO); - if (buffer->pages[i] == NULL) - goto out_pages; - - address = dma_map_page(card->device, buffer->pages[i], - 0, PAGE_SIZE, direction); - if (dma_mapping_error(card->device, address)) { - __free_page(buffer->pages[i]); - goto out_pages; - } - set_page_private(buffer->pages[i], address); - } - - return 0; - - out_pages: - for (j = 0; j < i; j++) { - address = page_private(buffer->pages[j]); - dma_unmap_page(card->device, address, - PAGE_SIZE, DMA_TO_DEVICE); - __free_page(buffer->pages[j]); - } - kfree(buffer->pages); - out: - buffer->pages = NULL; - - return -ENOMEM; -} - -int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma) -{ - unsigned long uaddr; - int i, err; - - uaddr = vma->vm_start; - for (i = 0; i < buffer->page_count; i++) { - err = vm_insert_page(vma, uaddr, buffer->pages[i]); - if (err) - return err; - - uaddr += PAGE_SIZE; - } - - return 0; -} - -void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, - struct fw_card *card) -{ - int i; - dma_addr_t address; - - for (i = 0; i < buffer->page_count; i++) { - address = page_private(buffer->pages[i]); - dma_unmap_page(card->device, address, - PAGE_SIZE, DMA_TO_DEVICE); - __free_page(buffer->pages[i]); - } - - kfree(buffer->pages); - buffer->pages = NULL; -} - -struct fw_iso_context *fw_iso_context_create(struct fw_card *card, - int type, int channel, int speed, size_t header_size, - fw_iso_callback_t callback, void *callback_data) -{ - struct fw_iso_context *ctx; - - ctx = card->driver->allocate_iso_context(card, - type, channel, header_size); - if (IS_ERR(ctx)) - return ctx; - - ctx->card = card; - ctx->type = type; - ctx->channel = channel; - ctx->speed = speed; - ctx->header_size = header_size; - ctx->callback = callback; - ctx->callback_data = callback_data; - - return ctx; -} - -void fw_iso_context_destroy(struct fw_iso_context *ctx) -{ - struct fw_card *card = ctx->card; - - card->driver->free_iso_context(ctx); -} - -int fw_iso_context_start(struct fw_iso_context *ctx, - int cycle, int sync, int tags) -{ - return ctx->card->driver->start_iso(ctx, cycle, sync, tags); -} - -int fw_iso_context_queue(struct fw_iso_context *ctx, - struct fw_iso_packet *packet, - struct fw_iso_buffer *buffer, - unsigned long payload) -{ - struct fw_card *card = ctx->card; - - return card->driver->queue_iso(ctx, packet, buffer, payload); -} - -int fw_iso_context_stop(struct fw_iso_context *ctx) -{ - return ctx->card->driver->stop_iso(ctx); -} - -/* - * Isochronous bus resource management (channels, bandwidth), client side - */ - -static int manage_bandwidth(struct fw_card *card, int irm_id, int generation, - int bandwidth, bool allocate) -{ - __be32 data[2]; - int try, new, old = allocate ? BANDWIDTH_AVAILABLE_INITIAL : 0; - - /* - * On a 1394a IRM with low contention, try < 1 is enough. - * On a 1394-1995 IRM, we need at least try < 2. - * Let's just do try < 5. - */ - for (try = 0; try < 5; try++) { - new = allocate ? old - bandwidth : old + bandwidth; - if (new < 0 || new > BANDWIDTH_AVAILABLE_INITIAL) - break; - - data[0] = cpu_to_be32(old); - data[1] = cpu_to_be32(new); - switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP, - irm_id, generation, SCODE_100, - CSR_REGISTER_BASE + CSR_BANDWIDTH_AVAILABLE, - data, sizeof(data))) { - case RCODE_GENERATION: - /* A generation change frees all bandwidth. */ - return allocate ? -EAGAIN : bandwidth; - - case RCODE_COMPLETE: - if (be32_to_cpup(data) == old) - return bandwidth; - - old = be32_to_cpup(data); - /* Fall through. */ - } - } - - return -EIO; -} - -static int manage_channel(struct fw_card *card, int irm_id, int generation, - u32 channels_mask, u64 offset, bool allocate) -{ - __be32 data[2], c, all, old; - int i, retry = 5; - - old = all = allocate ? cpu_to_be32(~0) : 0; - - for (i = 0; i < 32; i++) { - if (!(channels_mask & 1 << i)) - continue; - - c = cpu_to_be32(1 << (31 - i)); - if ((old & c) != (all & c)) - continue; - - data[0] = old; - data[1] = old ^ c; - switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP, - irm_id, generation, SCODE_100, - offset, data, sizeof(data))) { - case RCODE_GENERATION: - /* A generation change frees all channels. */ - return allocate ? -EAGAIN : i; - - case RCODE_COMPLETE: - if (data[0] == old) - return i; - - old = data[0]; - - /* Is the IRM 1394a-2000 compliant? */ - if ((data[0] & c) == (data[1] & c)) - continue; - - /* 1394-1995 IRM, fall through to retry. */ - default: - if (retry--) - i--; - } - } - - return -EIO; -} - -static void deallocate_channel(struct fw_card *card, int irm_id, - int generation, int channel) -{ - u32 mask; - u64 offset; - - mask = channel < 32 ? 1 << channel : 1 << (channel - 32); - offset = channel < 32 ? CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI : - CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO; - - manage_channel(card, irm_id, generation, mask, offset, false); -} - -/** - * fw_iso_resource_manage - Allocate or deallocate a channel and/or bandwidth - * - * In parameters: card, generation, channels_mask, bandwidth, allocate - * Out parameters: channel, bandwidth - * This function blocks (sleeps) during communication with the IRM. - * - * Allocates or deallocates at most one channel out of channels_mask. - * channels_mask is a bitfield with MSB for channel 63 and LSB for channel 0. - * (Note, the IRM's CHANNELS_AVAILABLE is a big-endian bitfield with MSB for - * channel 0 and LSB for channel 63.) - * Allocates or deallocates as many bandwidth allocation units as specified. - * - * Returns channel < 0 if no channel was allocated or deallocated. - * Returns bandwidth = 0 if no bandwidth was allocated or deallocated. - * - * If generation is stale, deallocations succeed but allocations fail with - * channel = -EAGAIN. - * - * If channel allocation fails, no bandwidth will be allocated either. - * If bandwidth allocation fails, no channel will be allocated either. - * But deallocations of channel and bandwidth are tried independently - * of each other's success. - */ -void fw_iso_resource_manage(struct fw_card *card, int generation, - u64 channels_mask, int *channel, int *bandwidth, - bool allocate) -{ - u32 channels_hi = channels_mask; /* channels 31...0 */ - u32 channels_lo = channels_mask >> 32; /* channels 63...32 */ - int irm_id, ret, c = -EINVAL; - - spin_lock_irq(&card->lock); - irm_id = card->irm_node->node_id; - spin_unlock_irq(&card->lock); - - if (channels_hi) - c = manage_channel(card, irm_id, generation, channels_hi, - CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI, allocate); - if (channels_lo && c < 0) { - c = manage_channel(card, irm_id, generation, channels_lo, - CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO, allocate); - if (c >= 0) - c += 32; - } - *channel = c; - - if (allocate && channels_mask != 0 && c < 0) - *bandwidth = 0; - - if (*bandwidth == 0) - return; - - ret = manage_bandwidth(card, irm_id, generation, *bandwidth, allocate); - if (ret < 0) - *bandwidth = 0; - - if (allocate && ret < 0 && c >= 0) { - deallocate_channel(card, irm_id, generation, c); - *channel = ret; - } -} |