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firewire: Use a buffer fill descriptor for receive when header size is 0.

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When the DMA is setup to not strip any headers, we need to use
the buffer fill descriptor instead of the dual buffer, since the
dual buffer descriptor must strip a non-zero number of header quadlets.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Kristian Høgsberg 2007-02-16 17:34:46 -05:00 committed by Stefan Richter
parent 1e1d196bf5
commit d2746dc192
3 changed files with 95 additions and 17 deletions
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2
drivers/firewire/fw-iso.c
View file

@ -111,7 +111,7 @@ fw_iso_context_create(struct fw_card *card, int type, size_t header_size,
{
struct fw_iso_context *ctx;
ctx = card->driver->allocate_iso_context(card, type);
ctx = card->driver->allocate_iso_context(card, type, header_size);
if (IS_ERR(ctx))
return ctx;

107
drivers/firewire/fw-ohci.c
View file

@ -1267,16 +1267,34 @@ ohci_enable_phys_dma(struct fw_card *card, int node_id, int generation)
spin_unlock_irqrestore(&ohci->lock, flags);
return retval;
}
static int handle_ir_bufferfill_packet(struct context *context,
struct descriptor *d,
struct descriptor *last)
{
struct iso_context *ctx =
container_of(context, struct iso_context, context);
static int handle_ir_packet(struct context *context,
struct descriptor *d,
struct descriptor *last)
if (d->res_count > 0)
return 0;
if (le16_to_cpu(last->control) & descriptor_irq_always)
ctx->base.callback(&ctx->base,
le16_to_cpu(last->res_count),
0, NULL, ctx->base.callback_data);
return 1;
}
static int handle_ir_dualbuffer_packet(struct context *context,
struct descriptor *d,
struct descriptor *last)
{
struct iso_context *ctx =
container_of(context, struct iso_context, context);
struct db_descriptor *db = (struct db_descriptor *) d;
size_t header_length;
if (db->first_res_count > 0 && db->second_res_count > 0)
/* This descriptor isn't done yet, stop iteration. */
return 0;
@ -1317,7 +1335,7 @@ static int handle_it_packet(struct context *context,
}
static struct fw_iso_context *
ohci_allocate_iso_context(struct fw_card *card, int type)
ohci_allocate_iso_context(struct fw_card *card, int type, size_t header_size)
{
struct fw_ohci *ohci = fw_ohci(card);
struct iso_context *ctx, *list;
@ -1333,7 +1351,10 @@ ohci_allocate_iso_context(struct fw_card *card, int type)
} else {
mask = &ohci->ir_context_mask;
list = ohci->ir_context_list;
callback = handle_ir_packet;
if (header_size > 0)
callback = handle_ir_dualbuffer_packet;
else
callback = handle_ir_bufferfill_packet;
}
spin_lock_irqsave(&ohci->lock, flags);
@ -1378,7 +1399,7 @@ static int ohci_start_iso(struct fw_iso_context *base, s32 cycle)
{
struct iso_context *ctx = container_of(base, struct iso_context, base);
struct fw_ohci *ohci = ctx->context.ohci;
u32 cycle_match = 0;
u32 cycle_match = 0, mode;
int index;
if (ctx->base.type == FW_ISO_CONTEXT_TRANSMIT) {
@ -1393,11 +1414,15 @@ static int ohci_start_iso(struct fw_iso_context *base, s32 cycle)
} else {
index = ctx - ohci->ir_context_list;
if (ctx->base.header_size > 0)
mode = IR_CONTEXT_DUAL_BUFFER_MODE;
else
mode = IR_CONTEXT_BUFFER_FILL;
reg_write(ohci, OHCI1394_IsoRecvIntEventClear, 1 << index);
reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1 << index);
reg_write(ohci, context_match(ctx->context.regs),
0xf0000000 | ctx->base.channel);
context_run(&ctx->context, IR_CONTEXT_DUAL_BUFFER_MODE);
context_run(&ctx->context, mode);
}
return 0;
@ -1544,10 +1569,10 @@ ohci_queue_iso_transmit(struct fw_iso_context *base,
}
static int
ohci_queue_iso_receive(struct fw_iso_context *base,
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
unsigned long payload)
ohci_queue_iso_receive_dualbuffer(struct fw_iso_context *base,
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
unsigned long payload)
{
struct iso_context *ctx = container_of(base, struct iso_context, base);
struct db_descriptor *db = NULL;
@ -1604,10 +1629,58 @@ ohci_queue_iso_receive(struct fw_iso_context *base,
if (p->interrupt)
db->control |= cpu_to_le16(descriptor_irq_always);
return 0;
}
return 0;
}
static int
ohci_queue_iso_receive_bufferfill(struct fw_iso_context *base,
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
unsigned long payload)
{
struct iso_context *ctx = container_of(base, struct iso_context, base);
struct descriptor *d = NULL;
dma_addr_t d_bus, page_bus;
u32 length, rest;
int page, offset;
page = payload >> PAGE_SHIFT;
offset = payload & ~PAGE_MASK;
rest = packet->payload_length;
while (rest > 0) {
d = context_get_descriptors(&ctx->context, 1, &d_bus);
if (d == NULL)
return -ENOMEM;
d->control = cpu_to_le16(descriptor_input_more |
descriptor_status |
descriptor_branch_always);
if (offset + rest < PAGE_SIZE)
length = rest;
else
length = PAGE_SIZE - offset;
page_bus = page_private(buffer->pages[page]);
d->data_address = cpu_to_le32(page_bus + offset);
d->req_count = cpu_to_le16(length);
d->res_count = cpu_to_le16(length);
context_append(&ctx->context, d, 1, 0);
offset = (offset + length) & ~PAGE_MASK;
rest -= length;
page++;
}
if (packet->interrupt)
d->control |= cpu_to_le16(descriptor_irq_always);
return 0;
}
static int
ohci_queue_iso(struct fw_iso_context *base,
struct fw_iso_packet *packet,
@ -1616,8 +1689,12 @@ ohci_queue_iso(struct fw_iso_context *base,
{
if (base->type == FW_ISO_CONTEXT_TRANSMIT)
return ohci_queue_iso_transmit(base, packet, buffer, payload);
else if (base->header_size == 0)
return ohci_queue_iso_receive_bufferfill(base, packet,
buffer, payload);
else
return ohci_queue_iso_receive(base, packet, buffer, payload);
return ohci_queue_iso_receive_dualbuffer(base, packet,
buffer, payload);
}
static const struct fw_card_driver ohci_driver = {

3
drivers/firewire/fw-transaction.h
View file

@ -425,7 +425,8 @@ struct fw_card_driver {
int node_id, int generation);
struct fw_iso_context *
(*allocate_iso_context)(struct fw_card *card, int type);
(*allocate_iso_context)(struct fw_card *card,
int type, size_t header_size);
void (*free_iso_context)(struct fw_iso_context *ctx);
int (*start_iso)(struct fw_iso_context *ctx, s32 cycle);