diff options
Diffstat (limited to 'drivers/ieee1394/iso.c')
| -rw-r--r-- | drivers/ieee1394/iso.c | 568 |
1 files changed, 0 insertions, 568 deletions
diff --git a/drivers/ieee1394/iso.c b/drivers/ieee1394/iso.c deleted file mode 100644 index 1cf6487b65ba..000000000000 --- a/drivers/ieee1394/iso.c +++ /dev/null @@ -1,568 +0,0 @@ -/* - * IEEE 1394 for Linux - * - * kernel ISO transmission/reception - * - * Copyright (C) 2002 Maas Digital LLC - * - * This code is licensed under the GPL. See the file COPYING in the root - * directory of the kernel sources for details. - */ - -#include <linux/pci.h> -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/slab.h> - -#include "hosts.h" -#include "iso.h" - -/** - * hpsb_iso_stop - stop DMA - */ -void hpsb_iso_stop(struct hpsb_iso *iso) -{ - if (!(iso->flags & HPSB_ISO_DRIVER_STARTED)) - return; - - iso->host->driver->isoctl(iso, iso->type == HPSB_ISO_XMIT ? - XMIT_STOP : RECV_STOP, 0); - iso->flags &= ~HPSB_ISO_DRIVER_STARTED; -} - -/** - * hpsb_iso_shutdown - deallocate buffer and DMA context - */ -void hpsb_iso_shutdown(struct hpsb_iso *iso) -{ - if (iso->flags & HPSB_ISO_DRIVER_INIT) { - hpsb_iso_stop(iso); - iso->host->driver->isoctl(iso, iso->type == HPSB_ISO_XMIT ? - XMIT_SHUTDOWN : RECV_SHUTDOWN, 0); - iso->flags &= ~HPSB_ISO_DRIVER_INIT; - } - - dma_region_free(&iso->data_buf); - kfree(iso); -} - -static struct hpsb_iso *hpsb_iso_common_init(struct hpsb_host *host, - enum hpsb_iso_type type, - unsigned int data_buf_size, - unsigned int buf_packets, - int channel, int dma_mode, - int irq_interval, - void (*callback) (struct hpsb_iso - *)) -{ - struct hpsb_iso *iso; - int dma_direction; - - /* make sure driver supports the ISO API */ - if (!host->driver->isoctl) { - printk(KERN_INFO - "ieee1394: host driver '%s' does not support the rawiso API\n", - host->driver->name); - return NULL; - } - - /* sanitize parameters */ - - if (buf_packets < 2) - buf_packets = 2; - - if ((dma_mode < HPSB_ISO_DMA_DEFAULT) - || (dma_mode > HPSB_ISO_DMA_PACKET_PER_BUFFER)) - dma_mode = HPSB_ISO_DMA_DEFAULT; - - if ((irq_interval < 0) || (irq_interval > buf_packets / 4)) - irq_interval = buf_packets / 4; - if (irq_interval == 0) /* really interrupt for each packet */ - irq_interval = 1; - - if (channel < -1 || channel >= 64) - return NULL; - - /* channel = -1 is OK for multi-channel recv but not for xmit */ - if (type == HPSB_ISO_XMIT && channel < 0) - return NULL; - - /* allocate and write the struct hpsb_iso */ - - iso = - kmalloc(sizeof(*iso) + - buf_packets * sizeof(struct hpsb_iso_packet_info), - GFP_KERNEL); - if (!iso) - return NULL; - - iso->infos = (struct hpsb_iso_packet_info *)(iso + 1); - - iso->type = type; - iso->host = host; - iso->hostdata = NULL; - iso->callback = callback; - init_waitqueue_head(&iso->waitq); - iso->channel = channel; - iso->irq_interval = irq_interval; - iso->dma_mode = dma_mode; - dma_region_init(&iso->data_buf); - iso->buf_size = PAGE_ALIGN(data_buf_size); - iso->buf_packets = buf_packets; - iso->pkt_dma = 0; - iso->first_packet = 0; - spin_lock_init(&iso->lock); - - if (iso->type == HPSB_ISO_XMIT) { - iso->n_ready_packets = iso->buf_packets; - dma_direction = PCI_DMA_TODEVICE; - } else { - iso->n_ready_packets = 0; - dma_direction = PCI_DMA_FROMDEVICE; - } - - atomic_set(&iso->overflows, 0); - iso->bytes_discarded = 0; - iso->flags = 0; - iso->prebuffer = 0; - - /* allocate the packet buffer */ - if (dma_region_alloc - (&iso->data_buf, iso->buf_size, host->pdev, dma_direction)) - goto err; - - return iso; - - err: - hpsb_iso_shutdown(iso); - return NULL; -} - -/** - * hpsb_iso_n_ready - returns number of packets ready to send or receive - */ -int hpsb_iso_n_ready(struct hpsb_iso *iso) -{ - unsigned long flags; - int val; - - spin_lock_irqsave(&iso->lock, flags); - val = iso->n_ready_packets; - spin_unlock_irqrestore(&iso->lock, flags); - - return val; -} - -/** - * hpsb_iso_xmit_init - allocate the buffer and DMA context - */ -struct hpsb_iso *hpsb_iso_xmit_init(struct hpsb_host *host, - unsigned int data_buf_size, - unsigned int buf_packets, - int channel, - int speed, - int irq_interval, - void (*callback) (struct hpsb_iso *)) -{ - struct hpsb_iso *iso = hpsb_iso_common_init(host, HPSB_ISO_XMIT, - data_buf_size, buf_packets, - channel, - HPSB_ISO_DMA_DEFAULT, - irq_interval, callback); - if (!iso) - return NULL; - - iso->speed = speed; - - /* tell the driver to start working */ - if (host->driver->isoctl(iso, XMIT_INIT, 0)) - goto err; - - iso->flags |= HPSB_ISO_DRIVER_INIT; - return iso; - - err: - hpsb_iso_shutdown(iso); - return NULL; -} - -/** - * hpsb_iso_recv_init - allocate the buffer and DMA context - * - * Note, if channel = -1, multi-channel receive is enabled. - */ -struct hpsb_iso *hpsb_iso_recv_init(struct hpsb_host *host, - unsigned int data_buf_size, - unsigned int buf_packets, - int channel, - int dma_mode, - int irq_interval, - void (*callback) (struct hpsb_iso *)) -{ - struct hpsb_iso *iso = hpsb_iso_common_init(host, HPSB_ISO_RECV, - data_buf_size, buf_packets, - channel, dma_mode, - irq_interval, callback); - if (!iso) - return NULL; - - /* tell the driver to start working */ - if (host->driver->isoctl(iso, RECV_INIT, 0)) - goto err; - - iso->flags |= HPSB_ISO_DRIVER_INIT; - return iso; - - err: - hpsb_iso_shutdown(iso); - return NULL; -} - -/** - * hpsb_iso_recv_listen_channel - * - * multi-channel only - */ -int hpsb_iso_recv_listen_channel(struct hpsb_iso *iso, unsigned char channel) -{ - if (iso->type != HPSB_ISO_RECV || iso->channel != -1 || channel >= 64) - return -EINVAL; - return iso->host->driver->isoctl(iso, RECV_LISTEN_CHANNEL, channel); -} - -/** - * hpsb_iso_recv_unlisten_channel - * - * multi-channel only - */ -int hpsb_iso_recv_unlisten_channel(struct hpsb_iso *iso, unsigned char channel) -{ - if (iso->type != HPSB_ISO_RECV || iso->channel != -1 || channel >= 64) - return -EINVAL; - return iso->host->driver->isoctl(iso, RECV_UNLISTEN_CHANNEL, channel); -} - -/** - * hpsb_iso_recv_set_channel_mask - * - * multi-channel only - */ -int hpsb_iso_recv_set_channel_mask(struct hpsb_iso *iso, u64 mask) -{ - if (iso->type != HPSB_ISO_RECV || iso->channel != -1) - return -EINVAL; - return iso->host->driver->isoctl(iso, RECV_SET_CHANNEL_MASK, - (unsigned long)&mask); -} - -/** - * hpsb_iso_recv_flush - check for arrival of new packets - * - * check for arrival of new packets immediately (even if irq_interval - * has not yet been reached) - */ -int hpsb_iso_recv_flush(struct hpsb_iso *iso) -{ - if (iso->type != HPSB_ISO_RECV) - return -EINVAL; - return iso->host->driver->isoctl(iso, RECV_FLUSH, 0); -} - -static int do_iso_xmit_start(struct hpsb_iso *iso, int cycle) -{ - int retval = iso->host->driver->isoctl(iso, XMIT_START, cycle); - if (retval) - return retval; - - iso->flags |= HPSB_ISO_DRIVER_STARTED; - return retval; -} - -/** - * hpsb_iso_xmit_start - start DMA - */ -int hpsb_iso_xmit_start(struct hpsb_iso *iso, int cycle, int prebuffer) -{ - if (iso->type != HPSB_ISO_XMIT) - return -1; - - if (iso->flags & HPSB_ISO_DRIVER_STARTED) - return 0; - - if (cycle < -1) - cycle = -1; - else if (cycle >= 8000) - cycle %= 8000; - - iso->xmit_cycle = cycle; - - if (prebuffer < 0) - prebuffer = iso->buf_packets - 1; - else if (prebuffer == 0) - prebuffer = 1; - - if (prebuffer >= iso->buf_packets) - prebuffer = iso->buf_packets - 1; - - iso->prebuffer = prebuffer; - - /* remember the starting cycle; DMA will commence from xmit_queue_packets() - once enough packets have been buffered */ - iso->start_cycle = cycle; - - return 0; -} - -/** - * hpsb_iso_recv_start - start DMA - */ -int hpsb_iso_recv_start(struct hpsb_iso *iso, int cycle, int tag_mask, int sync) -{ - int retval = 0; - int isoctl_args[3]; - - if (iso->type != HPSB_ISO_RECV) - return -1; - - if (iso->flags & HPSB_ISO_DRIVER_STARTED) - return 0; - - if (cycle < -1) - cycle = -1; - else if (cycle >= 8000) - cycle %= 8000; - - isoctl_args[0] = cycle; - - if (tag_mask < 0) - /* match all tags */ - tag_mask = 0xF; - isoctl_args[1] = tag_mask; - - isoctl_args[2] = sync; - - retval = - iso->host->driver->isoctl(iso, RECV_START, - (unsigned long)&isoctl_args[0]); - if (retval) - return retval; - - iso->flags |= HPSB_ISO_DRIVER_STARTED; - return retval; -} - -/* check to make sure the user has not supplied bogus values of offset/len - * that would cause the kernel to access memory outside the buffer */ -static int hpsb_iso_check_offset_len(struct hpsb_iso *iso, - unsigned int offset, unsigned short len, - unsigned int *out_offset, - unsigned short *out_len) -{ - if (offset >= iso->buf_size) - return -EFAULT; - - /* make sure the packet does not go beyond the end of the buffer */ - if (offset + len > iso->buf_size) - return -EFAULT; - - /* check for wrap-around */ - if (offset + len < offset) - return -EFAULT; - - /* now we can trust 'offset' and 'length' */ - *out_offset = offset; - *out_len = len; - - return 0; -} - -/** - * hpsb_iso_xmit_queue_packet - queue a packet for transmission. - * - * @offset is relative to the beginning of the DMA buffer, where the packet's - * data payload should already have been placed. - */ -int hpsb_iso_xmit_queue_packet(struct hpsb_iso *iso, u32 offset, u16 len, - u8 tag, u8 sy) -{ - struct hpsb_iso_packet_info *info; - unsigned long flags; - int rv; - - if (iso->type != HPSB_ISO_XMIT) - return -EINVAL; - - /* is there space in the buffer? */ - if (iso->n_ready_packets <= 0) { - return -EBUSY; - } - - info = &iso->infos[iso->first_packet]; - - /* check for bogus offset/length */ - if (hpsb_iso_check_offset_len - (iso, offset, len, &info->offset, &info->len)) - return -EFAULT; - - info->tag = tag; - info->sy = sy; - - spin_lock_irqsave(&iso->lock, flags); - - rv = iso->host->driver->isoctl(iso, XMIT_QUEUE, (unsigned long)info); - if (rv) - goto out; - - /* increment cursors */ - iso->first_packet = (iso->first_packet + 1) % iso->buf_packets; - iso->xmit_cycle = (iso->xmit_cycle + 1) % 8000; - iso->n_ready_packets--; - - if (iso->prebuffer != 0) { - iso->prebuffer--; - if (iso->prebuffer <= 0) { - iso->prebuffer = 0; - rv = do_iso_xmit_start(iso, iso->start_cycle); - } - } - - out: - spin_unlock_irqrestore(&iso->lock, flags); - return rv; -} - -/** - * hpsb_iso_xmit_sync - wait until all queued packets have been transmitted - */ -int hpsb_iso_xmit_sync(struct hpsb_iso *iso) -{ - if (iso->type != HPSB_ISO_XMIT) - return -EINVAL; - - return wait_event_interruptible(iso->waitq, - hpsb_iso_n_ready(iso) == - iso->buf_packets); -} - -/** - * hpsb_iso_packet_sent - * - * Available to low-level drivers. - * - * Call after a packet has been transmitted to the bus (interrupt context is - * OK). @cycle is the _exact_ cycle the packet was sent on. @error should be - * non-zero if some sort of error occurred when sending the packet. - */ -void hpsb_iso_packet_sent(struct hpsb_iso *iso, int cycle, int error) -{ - unsigned long flags; - spin_lock_irqsave(&iso->lock, flags); - - /* predict the cycle of the next packet to be queued */ - - /* jump ahead by the number of packets that are already buffered */ - cycle += iso->buf_packets - iso->n_ready_packets; - cycle %= 8000; - - iso->xmit_cycle = cycle; - iso->n_ready_packets++; - iso->pkt_dma = (iso->pkt_dma + 1) % iso->buf_packets; - - if (iso->n_ready_packets == iso->buf_packets || error != 0) { - /* the buffer has run empty! */ - atomic_inc(&iso->overflows); - } - - spin_unlock_irqrestore(&iso->lock, flags); -} - -/** - * hpsb_iso_packet_received - * - * Available to low-level drivers. - * - * Call after a packet has been received (interrupt context is OK). - */ -void hpsb_iso_packet_received(struct hpsb_iso *iso, u32 offset, u16 len, - u16 total_len, u16 cycle, u8 channel, u8 tag, - u8 sy) -{ - unsigned long flags; - spin_lock_irqsave(&iso->lock, flags); - - if (iso->n_ready_packets == iso->buf_packets) { - /* overflow! */ - atomic_inc(&iso->overflows); - /* Record size of this discarded packet */ - iso->bytes_discarded += total_len; - } else { - struct hpsb_iso_packet_info *info = &iso->infos[iso->pkt_dma]; - info->offset = offset; - info->len = len; - info->total_len = total_len; - info->cycle = cycle; - info->channel = channel; - info->tag = tag; - info->sy = sy; - - iso->pkt_dma = (iso->pkt_dma + 1) % iso->buf_packets; - iso->n_ready_packets++; - } - - spin_unlock_irqrestore(&iso->lock, flags); -} - -/** - * hpsb_iso_recv_release_packets - release packets, reuse buffer - * - * @n_packets have been read out of the buffer, re-use the buffer space - */ -int hpsb_iso_recv_release_packets(struct hpsb_iso *iso, unsigned int n_packets) -{ - unsigned long flags; - unsigned int i; - int rv = 0; - - if (iso->type != HPSB_ISO_RECV) - return -1; - - spin_lock_irqsave(&iso->lock, flags); - for (i = 0; i < n_packets; i++) { - rv = iso->host->driver->isoctl(iso, RECV_RELEASE, - (unsigned long)&iso->infos[iso-> - first_packet]); - if (rv) - break; - - iso->first_packet = (iso->first_packet + 1) % iso->buf_packets; - iso->n_ready_packets--; - - /* release memory from packets discarded when queue was full */ - if (iso->n_ready_packets == 0) { /* Release only after all prior packets handled */ - if (iso->bytes_discarded != 0) { - struct hpsb_iso_packet_info inf; - inf.total_len = iso->bytes_discarded; - iso->host->driver->isoctl(iso, RECV_RELEASE, - (unsigned long)&inf); - iso->bytes_discarded = 0; - } - } - } - spin_unlock_irqrestore(&iso->lock, flags); - return rv; -} - -/** - * hpsb_iso_wake - * - * Available to low-level drivers. - * - * Call to wake waiting processes after buffer space has opened up. - */ -void hpsb_iso_wake(struct hpsb_iso *iso) -{ - wake_up_interruptible(&iso->waitq); - - if (iso->callback) - iso->callback(iso); -} |