firewire: ohci: remove unused dualbuffer IR code

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@s5r6.in-berlin.de>

1 files changed, 1 insertions, 183 deletions

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 0f7c4bb978e7..047331e59b31 100644
--- 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_context *ctx, void *p)
         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_allocate_iso_context(struct fw_card *card,
                 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_context *base,
         } 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(struct fw_iso_context *base,
         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_context *base,
         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 *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 pci_dev *dev,
         }
 
         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 &&