[PATCH 3/8] firewire: ohci: remove unused dualbuffer IR code

From: Stefan Richter
Date: Sun Feb 21 2010 - 11:57:21 EST

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This code was no longer used since 2.6.33, "firewire: ohci: always use
packet-per-buffer mode for isochronous reception" commit 090699c0. If
anybody needs this code in the future for special purposes, it can be
brought back in. But it must not be re-enabled by default; drivers
(kernelspace or userspace drivers) should only get this mode if they
explicitly request it.

Signed-off-by: Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>
---
drivers/firewire/ohci.c | 184 ----------------------------------------
include/linux/pci_ids.h | 1 -
2 files changed, 1 insertion(+), 184 deletions(-)

Index: b/drivers/firewire/ohci.c
===================================================================
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -72,20 +72,6 @@ struct descriptor {
__le16 transfer_status;
} __attribute__((aligned(16)));

-struct db_descriptor {
- __le16 first_size;
- __le16 control;
- __le16 second_req_count;
- __le16 first_req_count;
- __le32 branch_address;
- __le16 second_res_count;
- __le16 first_res_count;
- __le32 reserved0;
- __le32 first_buffer;
- __le32 second_buffer;
- __le32 reserved1;
-} __attribute__((aligned(16)));
-
#define CONTROL_SET(regs) (regs)
#define CONTROL_CLEAR(regs) ((regs) + 4)
#define COMMAND_PTR(regs) ((regs) + 12)
@@ -187,7 +173,6 @@ struct fw_ohci {
int generation;
int request_generation; /* for timestamping incoming requests */

- bool use_dualbuffer;
bool old_uninorth;
bool bus_reset_packet_quirk;
bool iso_cycle_timer_quirk;
@@ -1863,52 +1848,6 @@ static void copy_iso_headers(struct iso_
ctx->header_length += ctx->base.header_size;
}

-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;
- __le32 *ir_header;
- size_t header_length;
- void *p, *end;
-
- if (db->first_res_count != 0 && db->second_res_count != 0) {
- if (ctx->excess_bytes <= le16_to_cpu(db->second_req_count)) {
- /* This descriptor isn't done yet, stop iteration. */
- return 0;
- }
- ctx->excess_bytes -= le16_to_cpu(db->second_req_count);
- }
-
- header_length = le16_to_cpu(db->first_req_count) -
- le16_to_cpu(db->first_res_count);
-
- p = db + 1;
- end = p + header_length;
- while (p < end) {
- copy_iso_headers(ctx, p);
- ctx->excess_bytes +=
- (le32_to_cpu(*(__le32 *)(p + 4)) >> 16) & 0xffff;
- p += max(ctx->base.header_size, (size_t)8);
- }
-
- ctx->excess_bytes -= le16_to_cpu(db->second_req_count) -
- le16_to_cpu(db->second_res_count);
-
- if (le16_to_cpu(db->control) & DESCRIPTOR_IRQ_ALWAYS) {
- 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;
- }
-
- return 1;
-}
-
static int handle_ir_packet_per_buffer(struct context *context,
struct descriptor *d,
struct descriptor *last)
@@ -1995,10 +1934,7 @@ static struct fw_iso_context *ohci_alloc
channels = &ohci->ir_context_channels;
mask = &ohci->ir_context_mask;
list = ohci->ir_context_list;
- if (ohci->use_dualbuffer)
- callback = handle_ir_dualbuffer_packet;
- else
- callback = handle_ir_packet_per_buffer;
+ callback = handle_ir_packet_per_buffer;
}

spin_lock_irqsave(&ohci->lock, flags);
@@ -2061,8 +1997,6 @@ static int ohci_start_iso(struct fw_iso_
} else {
index = ctx - ohci->ir_context_list;
control = IR_CONTEXT_ISOCH_HEADER;
- if (ohci->use_dualbuffer)
- control |= IR_CONTEXT_DUAL_BUFFER_MODE;
match = (tags << 28) | (sync << 8) | ctx->base.channel;
if (cycle >= 0) {
match |= (cycle & 0x07fff) << 12;
@@ -2223,92 +2157,6 @@ static int ohci_queue_iso_transmit(struc
return 0;
}

-static int 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;
- struct descriptor *d;
- struct fw_iso_packet *p;
- dma_addr_t d_bus, page_bus;
- u32 z, header_z, length, rest;
- int page, offset, packet_count, header_size;
-
- /*
- * FIXME: Cycle lost behavior should be configurable: lose
- * packet, retransmit or terminate..
- */
-
- p = packet;
- z = 2;
-
- /*
- * The OHCI controller puts the isochronous header and trailer in the
- * buffer, so we need at least 8 bytes.
- */
- packet_count = p->header_length / ctx->base.header_size;
- header_size = packet_count * max(ctx->base.header_size, (size_t)8);
-
- /* Get header size in number of descriptors. */
- header_z = DIV_ROUND_UP(header_size, sizeof(*d));
- page = payload >> PAGE_SHIFT;
- offset = payload & ~PAGE_MASK;
- rest = p->payload_length;
- /*
- * The controllers I've tested have not worked correctly when
- * second_req_count is zero. Rather than do something we know won't
- * work, return an error
- */
- if (rest == 0)
- return -EINVAL;
-
- while (rest > 0) {
- d = context_get_descriptors(&ctx->context,
- z + header_z, &d_bus);
- if (d == NULL)
- return -ENOMEM;
-
- db = (struct db_descriptor *) d;
- db->control = cpu_to_le16(DESCRIPTOR_STATUS |
- DESCRIPTOR_BRANCH_ALWAYS);
- db->first_size =
- cpu_to_le16(max(ctx->base.header_size, (size_t)8));
- if (p->skip && rest == p->payload_length) {
- db->control |= cpu_to_le16(DESCRIPTOR_WAIT);
- db->first_req_count = db->first_size;
- } else {
- 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));
-
- if (p->skip && rest == p->payload_length)
- length = 4;
- else if (offset + rest < PAGE_SIZE)
- length = rest;
- else
- length = PAGE_SIZE - offset;
-
- db->second_req_count = cpu_to_le16(length);
- db->second_res_count = db->second_req_count;
- page_bus = page_private(buffer->pages[page]);
- db->second_buffer = cpu_to_le32(page_bus + offset);
-
- if (p->interrupt && length == rest)
- db->control |= cpu_to_le16(DESCRIPTOR_IRQ_ALWAYS);
-
- context_append(&ctx->context, d, z, header_z);
- offset = (offset + length) & ~PAGE_MASK;
- rest -= length;
- if (offset == 0)
- page++;
- }
-
- return 0;
-}
-
static int ohci_queue_iso_receive_packet_per_buffer(struct fw_iso_context *base,
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
@@ -2399,9 +2247,6 @@ static int ohci_queue_iso(struct fw_iso_
spin_lock_irqsave(&ctx->context.ohci->lock, flags);
if (base->type == FW_ISO_CONTEXT_TRANSMIT)
ret = ohci_queue_iso_transmit(base, packet, buffer, payload);
- else if (ctx->context.ohci->use_dualbuffer)
- ret = ohci_queue_iso_receive_dualbuffer(base, packet,
- buffer, payload);
else
ret = ohci_queue_iso_receive_packet_per_buffer(base, packet,
buffer, payload);
@@ -2456,10 +2301,6 @@ static void ohci_pmac_off(struct pci_dev
#define ohci_pmac_off(dev)
#endif /* CONFIG_PPC_PMAC */

-#define PCI_VENDOR_ID_AGERE PCI_VENDOR_ID_ATT
-#define PCI_DEVICE_ID_AGERE_FW643 0x5901
-#define PCI_DEVICE_ID_TI_TSB43AB23 0x8024
-
static int __devinit pci_probe(struct pci_dev *dev,
const struct pci_device_id *ent)
{
@@ -2508,29 +2349,6 @@ static int __devinit pci_probe(struct pc
}

version = reg_read(ohci, OHCI1394_Version) & 0x00ff00ff;
-#if 0
- /* FIXME: make it a context option or remove dual-buffer mode */
- ohci->use_dualbuffer = version >= OHCI_VERSION_1_1;
-#endif
-
- /* dual-buffer mode is broken if more than one IR context is active */
- if (dev->vendor == PCI_VENDOR_ID_AGERE &&
- dev->device == PCI_DEVICE_ID_AGERE_FW643)
- ohci->use_dualbuffer = false;
-
- /* dual-buffer mode is broken */
- if (dev->vendor == PCI_VENDOR_ID_RICOH &&
- dev->device == PCI_DEVICE_ID_RICOH_R5C832)
- ohci->use_dualbuffer = false;
-
-/* x86-32 currently doesn't use highmem for dma_alloc_coherent */
-#if !defined(CONFIG_X86_32)
- /* dual-buffer mode is broken with descriptor addresses above 2G */
- if (dev->vendor == PCI_VENDOR_ID_TI &&
- (dev->device == PCI_DEVICE_ID_TI_TSB43AB22 ||
- dev->device == PCI_DEVICE_ID_TI_TSB43AB23))
- ohci->use_dualbuffer = false;
-#endif

#if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)
ohci->old_uninorth = dev->vendor == PCI_VENDOR_ID_APPLE &&
Index: b/include/linux/pci_ids.h
===================================================================
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -770,7 +770,6 @@
#define PCI_VENDOR_ID_TI 0x104c
#define PCI_DEVICE_ID_TI_TVP4020 0x3d07
#define PCI_DEVICE_ID_TI_4450 0x8011
-#define PCI_DEVICE_ID_TI_TSB43AB22 0x8023
#define PCI_DEVICE_ID_TI_XX21_XX11 0x8031
#define PCI_DEVICE_ID_TI_XX21_XX11_FM 0x8033
#define PCI_DEVICE_ID_TI_XX21_XX11_SD 0x8034

--
Stefan Richter
-=====-==-=- --=- =-=-=
http://arcgraph.de/sr/

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Next message: Stefan Richter: "[PATCH 4/8] firewire: ohci: reorder struct fw_ohci for better cacheefficiency"
Previous message: Stefan Richter: "[PATCH 2/8] firewire: core: combine a bit of repeated code"
In reply to: Stefan Richter: "[PATCH 2/8] firewire: core: combine a bit of repeated code"
Next in thread: Stefan Richter: "[PATCH 4/8] firewire: ohci: reorder struct fw_ohci for better cacheefficiency"
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