firewire: Fix dualbuffer iso receive mode and drop buffer fill mode.
The dualbuffer DMA setup did not account for the iso trailer word
and thus didn't work correctly. With this fixed we can drop the
dual buffer fallback mode.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index 6f9895d2..17e13d0 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -1233,24 +1233,6 @@
return bus_time;
}
-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);
-
- 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)
@@ -1258,19 +1240,33 @@
struct iso_context *ctx =
container_of(context, struct iso_context, context);
struct db_descriptor *db = (struct db_descriptor *) d;
+ __le32 *ir_header;
size_t header_length;
+ void *p, *end;
+ int i;
if (db->first_res_count > 0 && db->second_res_count > 0)
/* This descriptor isn't done yet, stop iteration. */
return 0;
- header_length = db->first_req_count - db->first_res_count;
- if (ctx->header_length + header_length <= PAGE_SIZE)
- memcpy(ctx->header + ctx->header_length, db + 1, header_length);
- ctx->header_length += header_length;
+ header_length = le16_to_cpu(db->first_req_count) -
+ le16_to_cpu(db->first_res_count);
+
+ i = ctx->header_length;
+ p = db + 1;
+ end = p + header_length;
+ while (p < end && i + ctx->base.header_size <= PAGE_SIZE) {
+ memcpy(ctx->header + i, p + 4, ctx->base.header_size);
+ i += ctx->base.header_size;
+ p += ctx->base.header_size + 4;
+ }
+
+ ctx->header_length = i;
if (le16_to_cpu(db->control) & descriptor_irq_always) {
- ctx->base.callback(&ctx->base, 0,
+ ir_header = (__le32 *) (db + 1);
+ ctx->base.callback(&ctx->base,
+ le32_to_cpu(ir_header[0]) & 0xffff,
ctx->header_length, ctx->header,
ctx->base.callback_data);
ctx->header_length = 0;
@@ -1315,12 +1311,10 @@
} else {
mask = &ohci->ir_context_mask;
list = ohci->ir_context_list;
- if (header_size > 0)
- callback = handle_ir_dualbuffer_packet;
- else
- callback = handle_ir_bufferfill_packet;
+ callback = handle_ir_dualbuffer_packet;
}
+ /* FIXME: We need a fallback for pre 1.1 OHCI. */
if (callback == handle_ir_dualbuffer_packet &&
ohci->version < OHCI_VERSION_1_1)
return ERR_PTR(-EINVAL);
@@ -1367,7 +1361,7 @@
{
struct iso_context *ctx = container_of(base, struct iso_context, base);
struct fw_ohci *ohci = ctx->context.ohci;
- u32 cycle_match = 0, mode;
+ u32 cycle_match = 0;
int index;
if (ctx->base.type == FW_ISO_CONTEXT_TRANSMIT) {
@@ -1382,16 +1376,14 @@
} 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),
(ctx->base.tags << 28) |
(ctx->base.sync << 8) | ctx->base.channel);
- context_run(&ctx->context, mode);
+ context_run(&ctx->context,
+ IR_CONTEXT_DUAL_BUFFER_MODE |
+ IR_CONTEXT_ISOCH_HEADER);
}
return 0;
@@ -1538,26 +1530,6 @@
}
static int
-setup_wait_descriptor(struct context *ctx)
-{
- struct descriptor *d;
- dma_addr_t d_bus;
-
- d = context_get_descriptors(ctx, 1, &d_bus);
- if (d == NULL)
- return -ENOMEM;
-
- d->control = cpu_to_le16(descriptor_input_more |
- descriptor_status |
- descriptor_branch_always |
- descriptor_wait);
-
- context_append(ctx, d, 1, 0);
-
- return 0;
-}
-
-static int
ohci_queue_iso_receive_dualbuffer(struct fw_iso_context *base,
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
@@ -1569,25 +1541,39 @@
struct fw_iso_packet *p;
dma_addr_t d_bus, page_bus;
u32 z, header_z, length, rest;
- int page, offset;
+ int page, offset, packet_count, header_size;
/* FIXME: Cycle lost behavior should be configurable: lose
* packet, retransmit or terminate.. */
- if (packet->skip && setup_wait_descriptor(&ctx->context) < 0)
- return -ENOMEM;
+ if (packet->skip) {
+ d = context_get_descriptors(&ctx->context, 2, &d_bus);
+ if (d == NULL)
+ return -ENOMEM;
+
+ db = (struct db_descriptor *) d;
+ db->control = cpu_to_le16(descriptor_status |
+ descriptor_branch_always |
+ descriptor_wait);
+ db->first_size = cpu_to_le16(ctx->base.header_size + 4);
+ context_append(&ctx->context, d, 2, 0);
+ }
p = packet;
z = 2;
+ /* The OHCI controller puts the status word in the header
+ * buffer too, so we need 4 extra bytes per packet. */
+ packet_count = p->header_length / ctx->base.header_size;
+ header_size = packet_count * (ctx->base.header_size + 4);
+
/* Get header size in number of descriptors. */
- header_z = DIV_ROUND_UP(p->header_length, sizeof *d);
+ header_z = DIV_ROUND_UP(header_size, sizeof *d);
page = payload >> PAGE_SHIFT;
offset = payload & ~PAGE_MASK;
rest = p->payload_length;
/* FIXME: OHCI 1.0 doesn't support dual buffer receive */
- /* FIXME: handle descriptor_wait */
/* FIXME: make packet-per-buffer/dual-buffer a context option */
while (rest > 0) {
d = context_get_descriptors(&ctx->context,
@@ -1598,8 +1584,8 @@
db = (struct db_descriptor *) d;
db->control = cpu_to_le16(descriptor_status |
descriptor_branch_always);
- db->first_size = cpu_to_le16(ctx->base.header_size);
- db->first_req_count = cpu_to_le16(p->header_length);
+ db->first_size = cpu_to_le16(ctx->base.header_size + 4);
+ db->first_req_count = cpu_to_le16(header_size);
db->first_res_count = db->first_req_count;
db->first_buffer = cpu_to_le32(d_bus + sizeof *db);
@@ -1626,57 +1612,6 @@
}
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;
-
- if (packet->skip && setup_wait_descriptor(&ctx->context) < 0)
- return -ENOMEM;
-
- 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);
-
- if (packet->interrupt && length == rest)
- d->control |= cpu_to_le16(descriptor_irq_always);
-
- context_append(&ctx->context, d, 1, 0);
-
- offset = (offset + length) & ~PAGE_MASK;
- rest -= length;
- page++;
- }
-
- return 0;
-}
-
-static int
ohci_queue_iso(struct fw_iso_context *base,
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
@@ -1686,9 +1621,6 @@
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 if (ctx->context.ohci->version >= OHCI_VERSION_1_1)
return ohci_queue_iso_receive_dualbuffer(base, packet,
buffer, payload);
