[PATCH 4/6] firewire: OHCI-1394 lowlevel driver

Stefan Richter
2007-05-02T12:19:12Z

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---
drivers/firewire/fw-ohci.c | 1896 +++++++++++++++++++++++++++++++++++++
drivers/firewire/fw-ohci.h | 153 ++
2 files changed, 2049 insertions(+)

Index: linux_juju/drivers/firewire/fw-ohci.h
===================================================================
--- /dev/null
+++ linux_juju/drivers/firewire/fw-ohci.h
@@ -0,0 +1,153 @@
+#ifndef __fw_ohci_h
+#define __fw_ohci_h
+
+/* OHCI register map */
+
+#define OHCI1394_Version 0x000
+#define OHCI1394_GUID_ROM 0x004
+#define OHCI1394_ATRetries 0x008
+#define OHCI1394_CSRData 0x00C
+#define OHCI1394_CSRCompareData 0x010
+#define OHCI1394_CSRControl 0x014
+#define OHCI1394_ConfigROMhdr 0x018
+#define OHCI1394_BusID 0x01C
+#define OHCI1394_BusOptions 0x020
+#define OHCI1394_GUIDHi 0x024
+#define OHCI1394_GUIDLo 0x028
+#define OHCI1394_ConfigROMmap 0x034
+#define OHCI1394_PostedWriteAddressLo 0x038
+#define OHCI1394_PostedWriteAddressHi 0x03C
+#define OHCI1394_VendorID 0x040
+#define OHCI1394_HCControlSet 0x050
+#define OHCI1394_HCControlClear 0x054
+#define OHCI1394_HCControl_BIBimageValid 0x80000000
+#define OHCI1394_HCControl_noByteSwapData 0x40000000
+#define OHCI1394_HCControl_programPhyEnable 0x00800000
+#define OHCI1394_HCControl_aPhyEnhanceEnable 0x00400000
+#define OHCI1394_HCControl_LPS 0x00080000
+#define OHCI1394_HCControl_postedWriteEnable 0x00040000
+#define OHCI1394_HCControl_linkEnable 0x00020000
+#define OHCI1394_HCControl_softReset 0x00010000
+#define OHCI1394_SelfIDBuffer 0x064
+#define OHCI1394_SelfIDCount 0x068
+#define OHCI1394_IRMultiChanMaskHiSet 0x070
+#define OHCI1394_IRMultiChanMaskHiClear 0x074
+#define OHCI1394_IRMultiChanMaskLoSet 0x078
+#define OHCI1394_IRMultiChanMaskLoClear 0x07C
+#define OHCI1394_IntEventSet 0x080
+#define OHCI1394_IntEventClear 0x084
+#define OHCI1394_IntMaskSet 0x088
+#define OHCI1394_IntMaskClear 0x08C
+#define OHCI1394_IsoXmitIntEventSet 0x090
+#define OHCI1394_IsoXmitIntEventClear 0x094
+#define OHCI1394_IsoXmitIntMaskSet 0x098
+#define OHCI1394_IsoXmitIntMaskClear 0x09C
+#define OHCI1394_IsoRecvIntEventSet 0x0A0
+#define OHCI1394_IsoRecvIntEventClear 0x0A4
+#define OHCI1394_IsoRecvIntMaskSet 0x0A8
+#define OHCI1394_IsoRecvIntMaskClear 0x0AC
+#define OHCI1394_InitialBandwidthAvailable 0x0B0
+#define OHCI1394_InitialChannelsAvailableHi 0x0B4
+#define OHCI1394_InitialChannelsAvailableLo 0x0B8
+#define OHCI1394_FairnessControl 0x0DC
+#define OHCI1394_LinkControlSet 0x0E0
+#define OHCI1394_LinkControlClear 0x0E4
+#define OHCI1394_LinkControl_rcvSelfID (1 << 9)
+#define OHCI1394_LinkControl_rcvPhyPkt (1 << 10)
+#define OHCI1394_LinkControl_cycleTimerEnable (1 << 20)
+#define OHCI1394_LinkControl_cycleMaster (1 << 21)
+#define OHCI1394_LinkControl_cycleSource (1 << 22)
+#define OHCI1394_NodeID 0x0E8
+#define OHCI1394_NodeID_idValid 0x80000000
+#define OHCI1394_PhyControl 0x0EC
+#define OHCI1394_PhyControl_Read(addr) (((addr) << 8) | 0x00008000)
+#define OHCI1394_PhyControl_ReadDone 0x80000000
+#define OHCI1394_PhyControl_ReadData(r) (((r) & 0x00ff0000) >> 16)
+#define OHCI1394_PhyControl_Write(addr, data) (((addr) << 8) | (data) | 0x00004000)
+#define OHCI1394_PhyControl_WriteDone 0x00004000
+#define OHCI1394_IsochronousCycleTimer 0x0F0
+#define OHCI1394_AsReqFilterHiSet 0x100
+#define OHCI1394_AsReqFilterHiClear 0x104
+#define OHCI1394_AsReqFilterLoSet 0x108
+#define OHCI1394_AsReqFilterLoClear 0x10C
+#define OHCI1394_PhyReqFilterHiSet 0x110
+#define OHCI1394_PhyReqFilterHiClear 0x114
+#define OHCI1394_PhyReqFilterLoSet 0x118
+#define OHCI1394_PhyReqFilterLoClear 0x11C
+#define OHCI1394_PhyUpperBound 0x120
+
+#define OHCI1394_AsReqTrContextBase 0x180
+#define OHCI1394_AsReqTrContextControlSet 0x180
+#define OHCI1394_AsReqTrContextControlClear 0x184
+#define OHCI1394_AsReqTrCommandPtr 0x18C
+
+#define OHCI1394_AsRspTrContextBase 0x1A0
+#define OHCI1394_AsRspTrContextControlSet 0x1A0
+#define OHCI1394_AsRspTrContextControlClear 0x1A4
+#define OHCI1394_AsRspTrCommandPtr 0x1AC
+
+#define OHCI1394_AsReqRcvContextBase 0x1C0
+#define OHCI1394_AsReqRcvContextControlSet 0x1C0
+#define OHCI1394_AsReqRcvContextControlClear 0x1C4
+#define OHCI1394_AsReqRcvCommandPtr 0x1CC
+
+#define OHCI1394_AsRspRcvContextBase 0x1E0
+#define OHCI1394_AsRspRcvContextControlSet 0x1E0
+#define OHCI1394_AsRspRcvContextControlClear 0x1E4
+#define OHCI1394_AsRspRcvCommandPtr 0x1EC
+
+/* Isochronous transmit registers */
+#define OHCI1394_IsoXmitContextBase(n) (0x200 + 16 * (n))
+#define OHCI1394_IsoXmitContextControlSet(n) (0x200 + 16 * (n))
+#define OHCI1394_IsoXmitContextControlClear(n) (0x204 + 16 * (n))
+#define OHCI1394_IsoXmitCommandPtr(n) (0x20C + 16 * (n))
+
+/* Isochronous receive registers */
+#define OHCI1394_IsoRcvContextBase(n) (0x400 + 32 * (n))
+#define OHCI1394_IsoRcvContextControlSet(n) (0x400 + 32 * (n))
+#define OHCI1394_IsoRcvContextControlClear(n) (0x404 + 32 * (n))
+#define OHCI1394_IsoRcvCommandPtr(n) (0x40C + 32 * (n))
+#define OHCI1394_IsoRcvContextMatch(n) (0x410 + 32 * (n))
+
+/* Interrupts Mask/Events */
+#define OHCI1394_reqTxComplete 0x00000001
+#define OHCI1394_respTxComplete 0x00000002
+#define OHCI1394_ARRQ 0x00000004
+#define OHCI1394_ARRS 0x00000008
+#define OHCI1394_RQPkt 0x00000010
+#define OHCI1394_RSPkt 0x00000020
+#define OHCI1394_isochTx 0x00000040
+#define OHCI1394_isochRx 0x00000080
+#define OHCI1394_postedWriteErr 0x00000100
+#define OHCI1394_lockRespErr 0x00000200
+#define OHCI1394_selfIDComplete 0x00010000
+#define OHCI1394_busReset 0x00020000
+#define OHCI1394_phy 0x00080000
+#define OHCI1394_cycleSynch 0x00100000
+#define OHCI1394_cycle64Seconds 0x00200000
+#define OHCI1394_cycleLost 0x00400000
+#define OHCI1394_cycleInconsistent 0x00800000
+#define OHCI1394_unrecoverableError 0x01000000
+#define OHCI1394_cycleTooLong 0x02000000
+#define OHCI1394_phyRegRcvd 0x04000000
+#define OHCI1394_masterIntEnable 0x80000000
+
+#define OHCI1394_evt_no_status 0x0
+#define OHCI1394_evt_long_packet 0x2
+#define OHCI1394_evt_missing_ack 0x3
+#define OHCI1394_evt_underrun 0x4
+#define OHCI1394_evt_overrun 0x5
+#define OHCI1394_evt_descriptor_read 0x6
+#define OHCI1394_evt_data_read 0x7
+#define OHCI1394_evt_data_write 0x8
+#define OHCI1394_evt_bus_reset 0x9
+#define OHCI1394_evt_timeout 0xa
+#define OHCI1394_evt_tcode_err 0xb
+#define OHCI1394_evt_reserved_b 0xc
+#define OHCI1394_evt_reserved_c 0xd
+#define OHCI1394_evt_unknown 0xe
+#define OHCI1394_evt_flushed 0xf
+
+#define OHCI1394_phy_tcode 0xe
+
+#endif /* __fw_ohci_h */
Index: linux_juju/drivers/firewire/fw-ohci.c
===================================================================
--- /dev/null
+++ linux_juju/drivers/firewire/fw-ohci.c
@@ -0,0 +1,1896 @@
+/* -*- c-basic-offset: 8 -*-
+ *
+ * fw-ohci.c - Driver for OHCI 1394 boards
+ * Copyright (C) 2003-2006 Kristian Hoegsberg <krh@bitplanet.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/poll.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/uaccess.h>
+#include <asm/semaphore.h>
+
+#include "fw-transaction.h"
+#include "fw-ohci.h"
+
+#define descriptor_output_more 0
+#define descriptor_output_last (1 << 12)
+#define descriptor_input_more (2 << 12)
+#define descriptor_input_last (3 << 12)
+#define descriptor_status (1 << 11)
+#define descriptor_key_immediate (2 << 8)
+#define descriptor_ping (1 << 7)
+#define descriptor_yy (1 << 6)
+#define descriptor_no_irq (0 << 4)
+#define descriptor_irq_error (1 << 4)
+#define descriptor_irq_always (3 << 4)
+#define descriptor_branch_always (3 << 2)
+#define descriptor_wait (3 << 0)
+
+struct descriptor {
+ __le16 req_count;
+ __le16 control;
+ __le32 data_address;
+ __le32 branch_address;
+ __le16 res_count;
+ __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)
+#define context_match(regs) ((regs) + 16)
+
+struct ar_buffer {
+ struct descriptor descriptor;
+ struct ar_buffer *next;
+ __le32 data[0];
+};
+
+struct ar_context {
+ struct fw_ohci *ohci;
+ struct ar_buffer *current_buffer;
+ struct ar_buffer *last_buffer;
+ void *pointer;
+ u32 regs;
+ struct tasklet_struct tasklet;
+};
+
+struct context;
+
+typedef int (*descriptor_callback_t)(struct context *ctx,
+ struct descriptor *d,
+ struct descriptor *last);
+struct context {
+ struct fw_ohci *ohci;
+ u32 regs;
+
+ struct descriptor *buffer;
+ dma_addr_t buffer_bus;
+ size_t buffer_size;
+ struct descriptor *head_descriptor;
+ struct descriptor *tail_descriptor;
+ struct descriptor *tail_descriptor_last;
+ struct descriptor *prev_descriptor;
+
+ descriptor_callback_t callback;
+
+ struct tasklet_struct tasklet;
+};
+
+#define it_header_sy(v) ((v) << 0)
+#define it_header_tcode(v) ((v) << 4)
+#define it_header_channel(v) ((v) << 8)
+#define it_header_tag(v) ((v) << 14)
+#define it_header_speed(v) ((v) << 16)
+#define it_header_data_length(v) ((v) << 16)
+
+struct iso_context {
+ struct fw_iso_context base;
+ struct context context;
+ void *header;
+ size_t header_length;
+};
+
+#define CONFIG_ROM_SIZE 1024
+
+struct fw_ohci {
+ struct fw_card card;
+
+ u32 version;
+ __iomem char *registers;
+ dma_addr_t self_id_bus;
+ __le32 *self_id_cpu;
+ struct tasklet_struct bus_reset_tasklet;
+ int node_id;
+ int generation;
+ int request_generation;
+ u32 bus_seconds;
+
+ /* Spinlock for accessing fw_ohci data. Never call out of
+ * this driver with this lock held. */
+ spinlock_t lock;
+ u32 self_id_buffer[512];
+
+ /* Config rom buffers */
+ __be32 *config_rom;
+ dma_addr_t config_rom_bus;
+ __be32 *next_config_rom;
+ dma_addr_t next_config_rom_bus;
+ u32 next_header;
+
+ struct ar_context ar_request_ctx;
+ struct ar_context ar_response_ctx;
+ struct context at_request_ctx;
+ struct context at_response_ctx;
+
+ u32 it_context_mask;
+ struct iso_context *it_context_list;
+ u32 ir_context_mask;
+ struct iso_context *ir_context_list;
+};
+
+static inline struct fw_ohci *fw_ohci(struct fw_card *card)
+{
+ return container_of(card, struct fw_ohci, card);
+}
+
+#define IT_CONTEXT_CYCLE_MATCH_ENABLE 0x80000000
+#define IR_CONTEXT_BUFFER_FILL 0x80000000
+#define IR_CONTEXT_ISOCH_HEADER 0x40000000
+#define IR_CONTEXT_CYCLE_MATCH_ENABLE 0x20000000
+#define IR_CONTEXT_MULTI_CHANNEL_MODE 0x10000000
+#define IR_CONTEXT_DUAL_BUFFER_MODE 0x08000000
+
+#define CONTEXT_RUN 0x8000
+#define CONTEXT_WAKE 0x1000
+#define CONTEXT_DEAD 0x0800
+#define CONTEXT_ACTIVE 0x0400
+
+#define OHCI1394_MAX_AT_REQ_RETRIES 0x2
+#define OHCI1394_MAX_AT_RESP_RETRIES 0x2
+#define OHCI1394_MAX_PHYS_RESP_RETRIES 0x8
+
+#define FW_OHCI_MAJOR 240
+#define OHCI1394_REGISTER_SIZE 0x800
+#define OHCI_LOOP_COUNT 500
+#define OHCI1394_PCI_HCI_Control 0x40
+#define SELF_ID_BUF_SIZE 0x800
+#define OHCI_TCODE_PHY_PACKET 0x0e
+#define OHCI_VERSION_1_1 0x010010
+#define ISO_BUFFER_SIZE (64 * 1024)
+#define AT_BUFFER_SIZE 4096
+
+static char ohci_driver_name[] = KBUILD_MODNAME;
+
+static inline void reg_write(const struct fw_ohci *ohci, int offset, u32 data)
+{
+ writel(data, ohci->registers + offset);
+}
+
+static inline u32 reg_read(const struct fw_ohci *ohci, int offset)
+{
+ return readl(ohci->registers + offset);
+}
+
+static inline void flush_writes(const struct fw_ohci *ohci)
+{
+ /* Do a dummy read to flush writes. */
+ reg_read(ohci, OHCI1394_Version);
+}
+
+static int
+ohci_update_phy_reg(struct fw_card *card, int addr,
+ int clear_bits, int set_bits)
+{
+ struct fw_ohci *ohci = fw_ohci(card);
+ u32 val, old;
+
+ reg_write(ohci, OHCI1394_PhyControl, OHCI1394_PhyControl_Read(addr));
+ msleep(2);
+ val = reg_read(ohci, OHCI1394_PhyControl);
+ if ((val & OHCI1394_PhyControl_ReadDone) == 0) {
+ fw_error("failed to set phy reg bits.\n");
+ return -EBUSY;
+ }
+
+ old = OHCI1394_PhyControl_ReadData(val);
+ old = (old & ~clear_bits) | set_bits;
+ reg_write(ohci, OHCI1394_PhyControl,
+ OHCI1394_PhyControl_Write(addr, old));
+
+ return 0;
+}
+
+static int ar_context_add_page(struct ar_context *ctx)
+{
+ struct device *dev = ctx->ohci->card.device;
+ struct ar_buffer *ab;
+ dma_addr_t ab_bus;
+ size_t offset;
+
+ ab = (struct ar_buffer *) __get_free_page(GFP_ATOMIC);
+ if (ab == NULL)
+ return -ENOMEM;
+
+ ab_bus = dma_map_single(dev, ab, PAGE_SIZE, DMA_BIDIRECTIONAL);
+ if (dma_mapping_error(ab_bus)) {
+ free_page((unsigned long) ab);
+ return -ENOMEM;
+ }
+
+ memset(&ab->descriptor, 0, sizeof ab->descriptor);
+ ab->descriptor.control = cpu_to_le16(descriptor_input_more |
+ descriptor_status |
+ descriptor_branch_always);
+ offset = offsetof(struct ar_buffer, data);
+ ab->descriptor.req_count = cpu_to_le16(PAGE_SIZE - offset);
+ ab->descriptor.data_address = cpu_to_le32(ab_bus + offset);
+ ab->descriptor.res_count = cpu_to_le16(PAGE_SIZE - offset);
+ ab->descriptor.branch_address = 0;
+
+ dma_sync_single_for_device(dev, ab_bus, PAGE_SIZE, DMA_BIDIRECTIONAL);
+
+ ctx->last_buffer->descriptor.branch_address = ab_bus | 1;
+ ctx->last_buffer->next = ab;
+ ctx->last_buffer = ab;
+
+ reg_write(ctx->ohci, control_set(ctx->regs), CONTEXT_WAKE);
+ flush_writes(ctx->ohci);
+
+ return 0;
+}
+
+static __le32 *handle_ar_packet(struct ar_context *ctx, __le32 *buffer)
+{
+ struct fw_ohci *ohci = ctx->ohci;
+ struct fw_packet p;
+ u32 status, length, tcode;
+
+ p.header[0] = le32_to_cpu(buffer[0]);
+ p.header[1] = le32_to_cpu(buffer[1]);
+ p.header[2] = le32_to_cpu(buffer[2]);
+
+ tcode = (p.header[0] >> 4) & 0x0f;
+ switch (tcode) {
+ case TCODE_WRITE_QUADLET_REQUEST:
+ case TCODE_READ_QUADLET_RESPONSE:
+ p.header[3] = (__force __u32) buffer[3];
+ p.header_length = 16;
+ p.payload_length = 0;
+ break;
+
+ case TCODE_READ_BLOCK_REQUEST :
+ p.header[3] = le32_to_cpu(buffer[3]);
+ p.header_length = 16;
+ p.payload_length = 0;
+ break;
+
+ case TCODE_WRITE_BLOCK_REQUEST:
+ case TCODE_READ_BLOCK_RESPONSE:
+ case TCODE_LOCK_REQUEST:
+ case TCODE_LOCK_RESPONSE:
+ p.header[3] = le32_to_cpu(buffer[3]);
+ p.header_length = 16;
+ p.payload_length = p.header[3] >> 16;
+ break;
+
+ case TCODE_WRITE_RESPONSE:
+ case TCODE_READ_QUADLET_REQUEST:
+ case OHCI_TCODE_PHY_PACKET:
+ p.header_length = 12;
+ p.payload_length = 0;
+ break;
+ }
+
+ p.payload = (void *) buffer + p.header_length;
+
+ /* FIXME: What to do about evt_* errors? */
+ length = (p.header_length + p.payload_length + 3) / 4;
+ status = le32_to_cpu(buffer[length]);
+
+ p.ack = ((status >> 16) & 0x1f) - 16;
+ p.speed = (status >> 21) & 0x7;
+ p.timestamp = status & 0xffff;
+ p.generation = ohci->request_generation;
+
+ /* The OHCI bus reset handler synthesizes a phy packet with
+ * the new generation number when a bus reset happens (see
+ * section 8.4.2.3). This helps us determine when a request
+ * was received and make sure we send the response in the same
+ * generation. We only need this for requests; for responses
+ * we use the unique tlabel for finding the matching
+ * request. */
+
+ if (p.ack + 16 == 0x09)
+ ohci->request_generation = (buffer[2] >> 16) & 0xff;
+ else if (ctx == &ohci->ar_request_ctx)
+ fw_core_handle_request(&ohci->card, &p);
+ else
+ fw_core_handle_response(&ohci->card, &p);
+
+ return buffer + length + 1;
+}
+
+static void ar_context_tasklet(unsigned long data)
+{
+ struct ar_context *ctx = (struct ar_context *)data;
+ struct fw_ohci *ohci = ctx->ohci;
+ struct ar_buffer *ab;
+ struct descriptor *d;
+ void *buffer, *end;
+
+ ab = ctx->current_buffer;
+ d = &ab->descriptor;
+
+ if (d->res_count == 0) {
+ size_t size, rest, offset;
+
+ /* This descriptor is finished and we may have a
+ * packet split across this and the next buffer. We
+ * reuse the page for reassembling the split packet. */
+
+ offset = offsetof(struct ar_buffer, data);
+ dma_unmap_single(ohci->card.device,
+ ab->descriptor.data_address - offset,
+ PAGE_SIZE, DMA_BIDIRECTIONAL);
+
+ buffer = ab;
+ ab = ab->next;
+ d = &ab->descriptor;
+ size = buffer + PAGE_SIZE - ctx->pointer;
+ rest = le16_to_cpu(d->req_count) - le16_to_cpu(d->res_count);
+ memmove(buffer, ctx->pointer, size);
+ memcpy(buffer + size, ab->data, rest);
+ ctx->current_buffer = ab;
+ ctx->pointer = (void *) ab->data + rest;
+ end = buffer + size + rest;
+
+ while (buffer < end)
+ buffer = handle_ar_packet(ctx, buffer);
+
+ free_page((unsigned long)buffer);
+ ar_context_add_page(ctx);
+ } else {
+ buffer = ctx->pointer;
+ ctx->pointer = end =
+ (void *) ab + PAGE_SIZE - le16_to_cpu(d->res_count);
+
+ while (buffer < end)
+ buffer = handle_ar_packet(ctx, buffer);
+ }
+}
+
+static int
+ar_context_init(struct ar_context *ctx, struct fw_ohci *ohci, u32 regs)
+{
+ struct ar_buffer ab;
+
+ ctx->regs = regs;
+ ctx->ohci = ohci;
+ ctx->last_buffer = &ab;
+ tasklet_init(&ctx->tasklet, ar_context_tasklet, (unsigned long)ctx);
+
+ ar_context_add_page(ctx);
+ ar_context_add_page(ctx);
+ ctx->current_buffer = ab.next;
+ ctx->pointer = ctx->current_buffer->data;
+
+ reg_write(ctx->ohci, command_ptr(ctx->regs), ab.descriptor.branch_address);
+ reg_write(ctx->ohci, control_set(ctx->regs), CONTEXT_RUN);
+ flush_writes(ctx->ohci);
+
+ return 0;
+}
+
+static void context_tasklet(unsigned long data)
+{
+ struct context *ctx = (struct context *) data;
+ struct fw_ohci *ohci = ctx->ohci;
+ struct descriptor *d, *last;
+ u32 address;
+ int z;
+
+ dma_sync_single_for_cpu(ohci->card.device, ctx->buffer_bus,
+ ctx->buffer_size, DMA_TO_DEVICE);
+
+ d = ctx->tail_descriptor;
+ last = ctx->tail_descriptor_last;
+
+ while (last->branch_address != 0) {
+ address = le32_to_cpu(last->branch_address);
+ z = address & 0xf;
+ d = ctx->buffer + (address - ctx->buffer_bus) / sizeof *d;
+ last = (z == 2) ? d : d + z - 1;
+
+ if (!ctx->callback(ctx, d, last))
+ break;
+
+ ctx->tail_descriptor = d;
+ ctx->tail_descriptor_last = last;
+ }
+}
+
+static int
+context_init(struct context *ctx, struct fw_ohci *ohci,
+ size_t buffer_size, u32 regs,
+ descriptor_callback_t callback)
+{
+ ctx->ohci = ohci;
+ ctx->regs = regs;
+ ctx->buffer_size = buffer_size;
+ ctx->buffer = kmalloc(buffer_size, GFP_KERNEL);
+ if (ctx->buffer == NULL)
+ return -ENOMEM;
+
+ tasklet_init(&ctx->tasklet, context_tasklet, (unsigned long)ctx);
+ ctx->callback = callback;
+
+ ctx->buffer_bus =
+ dma_map_single(ohci->card.device, ctx->buffer,
+ buffer_size, DMA_TO_DEVICE);
+ if (dma_mapping_error(ctx->buffer_bus)) {
+ kfree(ctx->buffer);
+ return -ENOMEM;
+ }
+
+ ctx->head_descriptor = ctx->buffer;
+ ctx->prev_descriptor = ctx->buffer;
+ ctx->tail_descriptor = ctx->buffer;
+ ctx->tail_descriptor_last = ctx->buffer;
+
+ /* We put a dummy descriptor in the buffer that has a NULL
+ * branch address and looks like it's been sent. That way we
+ * have a descriptor to append DMA programs to. Also, the
+ * ring buffer invariant is that it always has at least one
+ * element so that head == tail means buffer full. */
+
+ memset(ctx->head_descriptor, 0, sizeof *ctx->head_descriptor);
+ ctx->head_descriptor->control = cpu_to_le16(descriptor_output_last);
+ ctx->head_descriptor->transfer_status = cpu_to_le16(0x8011);
+ ctx->head_descriptor++;
+
+ return 0;
+}
+
+static void
+context_release(struct context *ctx)
+{
+ struct fw_card *card = &ctx->ohci->card;
+
+ dma_unmap_single(card->device, ctx->buffer_bus,
+ ctx->buffer_size, DMA_TO_DEVICE);
+ kfree(ctx->buffer);
+}
+
+static struct descriptor *
+context_get_descriptors(struct context *ctx, int z, dma_addr_t *d_bus)
+{
+ struct descriptor *d, *tail, *end;
+
+ d = ctx->head_descriptor;
+ tail = ctx->tail_descriptor;
+ end = ctx->buffer + ctx->buffer_size / sizeof(struct descriptor);
+
+ if (d + z <= tail) {
+ goto has_space;
+ } else if (d > tail && d + z <= end) {
+ goto has_space;
+ } else if (d > tail && ctx->buffer + z <= tail) {
+ d = ctx->buffer;
+ goto has_space;
+ }
+
+ return NULL;
+
+ has_space:
+ memset(d, 0, z * sizeof *d);
+ *d_bus = ctx->buffer_bus + (d - ctx->buffer) * sizeof *d;
+
+ return d;
+}
+
+static void context_run(struct context *ctx, u32 extra)
+{
+ struct fw_ohci *ohci = ctx->ohci;
+
+ reg_write(ohci, command_ptr(ctx->regs),
+ le32_to_cpu(ctx->tail_descriptor_last->branch_address));
+ reg_write(ohci, control_clear(ctx->regs), ~0);
+ reg_write(ohci, control_set(ctx->regs), CONTEXT_RUN | extra);
+ flush_writes(ohci);
+}
+
+static void context_append(struct context *ctx,
+ struct descriptor *d, int z, int extra)
+{
+ dma_addr_t d_bus;
+
+ d_bus = ctx->buffer_bus + (d - ctx->buffer) * sizeof *d;
+
+ ctx->head_descriptor = d + z + extra;
+ ctx->prev_descriptor->branch_address = cpu_to_le32(d_bus | z);
+ ctx->prev_descriptor = z == 2 ? d : d + z - 1;
+
+ dma_sync_single_for_device(ctx->ohci->card.device, ctx->buffer_bus,
+ ctx->buffer_size, DMA_TO_DEVICE);
+
+ reg_write(ctx->ohci, control_set(ctx->regs), CONTEXT_WAKE);
+ flush_writes(ctx->ohci);
+}
+
+static void context_stop(struct context *ctx)
+{
+ u32 reg;
+ int i;
+
+ reg_write(ctx->ohci, control_clear(ctx->regs), CONTEXT_RUN);
+ flush_writes(ctx->ohci);
+
+ for (i = 0; i < 10; i++) {
+ reg = reg_read(ctx->ohci, control_set(ctx->regs));
+ if ((reg & CONTEXT_ACTIVE) == 0)
+ break;
+
+ fw_notify("context_stop: still active (0x%08x)\n", reg);
+ msleep(1);
+ }
+}
+
+struct driver_data {
+ struct fw_packet *packet;
+};
+
+/* This function apppends a packet to the DMA queue for transmission.
+ * Must always be called with the ochi->lock held to ensure proper
+ * generation handling and locking around packet queue manipulation. */
+static int
+at_context_queue_packet(struct context *ctx, struct fw_packet *packet)
+{
+ struct fw_ohci *ohci = ctx->ohci;
+ dma_addr_t d_bus, payload_bus;
+ struct driver_data *driver_data;
+ struct descriptor *d, *last;
+ __le32 *header;
+ int z, tcode;
+ u32 reg;
+
+ d = context_get_descriptors(ctx, 4, &d_bus);
+ if (d == NULL) {
+ packet->ack = RCODE_SEND_ERROR;
+ return -1;
+ }
+
+ d[0].control = cpu_to_le16(descriptor_key_immediate);
+ d[0].res_count = cpu_to_le16(packet->timestamp);
+
+ /* The DMA format for asyncronous link packets is different
+ * from the IEEE1394 layout, so shift the fields around
+ * accordingly. If header_length is 8, it's a PHY packet, to
+ * which we need to prepend an extra quadlet. */
+
+ header = (__le32 *) &d[1];
+ if (packet->header_length > 8) {
+ header[0] = cpu_to_le32((packet->header[0] & 0xffff) |
+ (packet->speed << 16));
+ header[1] = cpu_to_le32((packet->header[1] & 0xffff) |
+ (packet->header[0] & 0xffff0000));
+ header[2] = cpu_to_le32(packet->header[2]);
+
+ tcode = (packet->header[0] >> 4) & 0x0f;
+ if (TCODE_IS_BLOCK_PACKET(tcode))
+ header[3] = cpu_to_le32(packet->header[3]);
+ else
+ header[3] = (__force __le32) packet->header[3];
+
+ d[0].req_count = cpu_to_le16(packet->header_length);
+ } else {
+ header[0] = cpu_to_le32((OHCI1394_phy_tcode << 4) |
+ (packet->speed << 16));
+ header[1] = cpu_to_le32(packet->header[0]);
+ header[2] = cpu_to_le32(packet->header[1]);
+ d[0].req_count = cpu_to_le16(12);
+ }
+
+ driver_data = (struct driver_data *) &d[3];
+ driver_data->packet = packet;
+ packet->driver_data = driver_data;
+
+ if (packet->payload_length > 0) {
+ payload_bus =
+ dma_map_single(ohci->card.device, packet->payload,
+ packet->payload_length, DMA_TO_DEVICE);
+ if (dma_mapping_error(payload_bus)) {
+ packet->ack = RCODE_SEND_ERROR;
+ return -1;
+ }
+
+ d[2].req_count = cpu_to_le16(packet->payload_length);
+ d[2].data_address = cpu_to_le32(payload_bus);
+ last = &d[2];
+ z = 3;
+ } else {
+ last = &d[0];
+ z = 2;
+ }
+
+ last->control |= cpu_to_le16(descriptor_output_last |
+ descriptor_irq_always |
+ descriptor_branch_always);
+
+ /* FIXME: Document how the locking works. */
+ if (ohci->generation != packet->generation) {
+ packet->ack = RCODE_GENERATION;
+ return -1;
+ }
+
+ context_append(ctx, d, z, 4 - z);
+
+ /* If the context isn't already running, start it up. */
+ reg = reg_read(ctx->ohci, control_set(ctx->regs));
+ if ((reg & CONTEXT_RUN) == 0)
+ context_run(ctx, 0);
+
+ return 0;
+}
+
+static int handle_at_packet(struct context *context,
+ struct descriptor *d,
+ struct descriptor *last)
+{
+ struct driver_data *driver_data;
+ struct fw_packet *packet;
+ struct fw_ohci *ohci = context->ohci;
+ dma_addr_t payload_bus;
+ int evt;
+
+ if (last->transfer_status == 0)
+ /* This descriptor isn't done yet, stop iteration. */
+ return 0;
+
+ driver_data = (struct driver_data *) &d[3];
+ packet = driver_data->packet;
+ if (packet == NULL)
+ /* This packet was cancelled, just continue. */
+ return 1;
+
+ payload_bus = le32_to_cpu(last->data_address);
+ if (payload_bus != 0)
+ dma_unmap_single(ohci->card.device, payload_bus,
+ packet->payload_length, DMA_TO_DEVICE);
+
+ evt = le16_to_cpu(last->transfer_status) & 0x1f;
+ packet->timestamp = le16_to_cpu(last->res_count);
+
+ switch (evt) {
+ case OHCI1394_evt_timeout:
+ /* Async response transmit timed out. */
+ packet->ack = RCODE_CANCELLED;
+ break;
+
+ case OHCI1394_evt_flushed:
+ /* The packet was flushed should give same error as
+ * when we try to use a stale generation count. */
+ packet->ack = RCODE_GENERATION;
+ break;
+
+ case OHCI1394_evt_missing_ack:
+ /* Using a valid (current) generation count, but the
+ * node is not on the bus or not sending acks. */
+ packet->ack = RCODE_NO_ACK;
+ break;
+
+ case ACK_COMPLETE + 0x10:
+ case ACK_PENDING + 0x10:
+ case ACK_BUSY_X + 0x10:
+ case ACK_BUSY_A + 0x10:
+ case ACK_BUSY_B + 0x10:
+ case ACK_DATA_ERROR + 0x10:
+ case ACK_TYPE_ERROR + 0x10:
+ packet->ack = evt - 0x10;
+ break;
+
+ default:
+ packet->ack = RCODE_SEND_ERROR;
+ break;
+ }
+
+ packet->callback(packet, &ohci->card, packet->ack);
+
+ return 1;
+}
+
+#define header_get_destination(q) (((q) >> 16) & 0xffff)
+#define header_get_tcode(q) (((q) >> 4) & 0x0f)
+#define header_get_offset_high(q) (((q) >> 0) & 0xffff)
+#define header_get_data_length(q) (((q) >> 16) & 0xffff)
+#define header_get_extended_tcode(q) (((q) >> 0) & 0xffff)
+
+static void
+handle_local_rom(struct fw_ohci *ohci, struct fw_packet *packet, u32 csr)
+{
+ struct fw_packet response;
+ int tcode, length, i;
+
+ tcode = header_get_tcode(packet->header[0]);
+ if (TCODE_IS_BLOCK_PACKET(tcode))
+ length = header_get_data_length(packet->header[3]);
+ else
+ length = 4;
+
+ i = csr - CSR_CONFIG_ROM;
+ if (i + length > CONFIG_ROM_SIZE) {
+ fw_fill_response(&response, packet->header,
+ RCODE_ADDRESS_ERROR, NULL, 0);
+ } else if (!TCODE_IS_READ_REQUEST(tcode)) {
+ fw_fill_response(&response, packet->header,
+ RCODE_TYPE_ERROR, NULL, 0);
+ } else {
+ fw_fill_response(&response, packet->header, RCODE_COMPLETE,
+ (void *) ohci->config_rom + i, length);
+ }
+
+ fw_core_handle_response(&ohci->card, &response);
+}
+
+static void
+handle_local_lock(struct fw_ohci *ohci, struct fw_packet *packet, u32 csr)
+{
+ struct fw_packet response;
+ int tcode, length, ext_tcode, sel;
+ __be32 *payload, lock_old;
+ u32 lock_arg, lock_data;
+
+ tcode = header_get_tcode(packet->header[0]);
+ length = header_get_data_length(packet->header[3]);
+ payload = packet->payload;
+ ext_tcode = header_get_extended_tcode(packet->header[3]);
+
+ if (tcode == TCODE_LOCK_REQUEST &&
+ ext_tcode == EXTCODE_COMPARE_SWAP && length == 8) {
+ lock_arg = be32_to_cpu(payload[0]);
+ lock_data = be32_to_cpu(payload[1]);
+ } else if (tcode == TCODE_READ_QUADLET_REQUEST) {
+ lock_arg = 0;
+ lock_data = 0;
+ } else {
+ fw_fill_response(&response, packet->header,
+ RCODE_TYPE_ERROR, NULL, 0);
+ goto out;
+ }
+
+ sel = (csr - CSR_BUS_MANAGER_ID) / 4;
+ reg_write(ohci, OHCI1394_CSRData, lock_data);
+ reg_write(ohci, OHCI1394_CSRCompareData, lock_arg);
+ reg_write(ohci, OHCI1394_CSRControl, sel);
+
+ if (reg_read(ohci, OHCI1394_CSRControl) & 0x80000000)
+ lock_old = cpu_to_be32(reg_read(ohci, OHCI1394_CSRData));
+ else
+ fw_notify("swap not done yet\n");
+
+ fw_fill_response(&response, packet->header,
+ RCODE_COMPLETE, &lock_old, sizeof lock_old);
+ out:
+ fw_core_handle_response(&ohci->card, &response);
+}
+
+static void
+handle_local_request(struct context *ctx, struct fw_packet *packet)
+{
+ u64 offset;
+ u32 csr;
+
+ if (ctx == &ctx->ohci->at_request_ctx) {
+ packet->ack = ACK_PENDING;
+ packet->callback(packet, &ctx->ohci->card, packet->ack);
+ }
+
+ offset =
+ ((unsigned long long)
+ header_get_offset_high(packet->header[1]) << 32) |
+ packet->header[2];
+ csr = offset - CSR_REGISTER_BASE;
+
+ /* Handle config rom reads. */
+ if (csr >= CSR_CONFIG_ROM && csr < CSR_CONFIG_ROM_END)
+ handle_local_rom(ctx->ohci, packet, csr);
+ else switch (csr) {
+ case CSR_BUS_MANAGER_ID:
+ case CSR_BANDWIDTH_AVAILABLE:
+ case CSR_CHANNELS_AVAILABLE_HI:
+ case CSR_CHANNELS_AVAILABLE_LO:
+ handle_local_lock(ctx->ohci, packet, csr);
+ break;
+ default:
+ if (ctx == &ctx->ohci->at_request_ctx)
+ fw_core_handle_request(&ctx->ohci->card, packet);
+ else
+ fw_core_handle_response(&ctx->ohci->card, packet);
+ break;
+ }
+
+ if (ctx == &ctx->ohci->at_response_ctx) {
+ packet->ack = ACK_COMPLETE;
+ packet->callback(packet, &ctx->ohci->card, packet->ack);
+ }
+}
+
+static void
+at_context_transmit(struct context *ctx, struct fw_packet *packet)
+{
+ unsigned long flags;
+ int retval;
+
+ spin_lock_irqsave(&ctx->ohci->lock, flags);
+
+ if (header_get_destination(packet->header[0]) == ctx->ohci->node_id &&
+ ctx->ohci->generation == packet->generation) {
+ spin_unlock_irqrestore(&ctx->ohci->lock, flags);
+ handle_local_request(ctx, packet);
+ return;
+ }
+
+ retval = at_context_queue_packet(ctx, packet);
+ spin_unlock_irqrestore(&ctx->ohci->lock, flags);
+
+ if (retval < 0)
+ packet->callback(packet, &ctx->ohci->card, packet->ack);
+
+}
+
+static void bus_reset_tasklet(unsigned long data)
+{
+ struct fw_ohci *ohci = (struct fw_ohci *)data;
+ int self_id_count, i, j, reg;
+ int generation, new_generation;
+ unsigned long flags;
+
+ reg = reg_read(ohci, OHCI1394_NodeID);
+ if (!(reg & OHCI1394_NodeID_idValid)) {
+ fw_error("node ID not valid, new bus reset in progress\n");
+ return;
+ }
+ ohci->node_id = reg & 0xffff;
+
+ /* The count in the SelfIDCount register is the number of
+ * bytes in the self ID receive buffer. Since we also receive
+ * the inverted quadlets and a header quadlet, we shift one
+ * bit extra to get the actual number of self IDs. */
+
+ self_id_count = (reg_read(ohci, OHCI1394_SelfIDCount) >> 3) & 0x3ff;
+ generation = (le32_to_cpu(ohci->self_id_cpu[0]) >> 16) & 0xff;
+
+ for (i = 1, j = 0; j < self_id_count; i += 2, j++) {
+ if (ohci->self_id_cpu[i] != ~ohci->self_id_cpu[i + 1])
+ fw_error("inconsistent self IDs\n");
+ ohci->self_id_buffer[j] = le32_to_cpu(ohci->self_id_cpu[i]);
+ }
+
+ /* Check the consistency of the self IDs we just read. The
+ * problem we face is that a new bus reset can start while we
+ * read out the self IDs from the DMA buffer. If this happens,
+ * the DMA buffer will be overwritten with new self IDs and we
+ * will read out inconsistent data. The OHCI specification
+ * (section 11.2) recommends a technique similar to
+ * linux/seqlock.h, where we remember the generation of the
+ * self IDs in the buffer before reading them out and compare
+ * it to the current generation after reading them out. If
+ * the two generations match we know we have a consistent set
+ * of self IDs. */
+
+ new_generation = (reg_read(ohci, OHCI1394_SelfIDCount) >> 16) & 0xff;
+ if (new_generation != generation) {
+ fw_notify("recursive bus reset detected, "
+ "discarding self ids\n");
+ return;
+ }
+
+ /* FIXME: Document how the locking works. */
+ spin_lock_irqsave(&ohci->lock, flags);
+
+ ohci->generation = generation;
+ context_stop(&ohci->at_request_ctx);
+ context_stop(&ohci->at_response_ctx);
+ reg_write(ohci, OHCI1394_IntEventClear, OHCI1394_busReset);
+
+ /* This next bit is unrelated to the AT context stuff but we
+ * have to do it under the spinlock also. If a new config rom
+ * was set up before this reset, the old one is now no longer
+ * in use and we can free it. Update the config rom pointers
+ * to point to the current config rom and clear the
+ * next_config_rom pointer so a new udpate can take place. */
+
+ if (ohci->next_config_rom != NULL) {
+ dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
+ ohci->config_rom, ohci->config_rom_bus);
+ ohci->config_rom = ohci->next_config_rom;
+ ohci->config_rom_bus = ohci->next_config_rom_bus;
+ ohci->next_config_rom = NULL;
+
+ /* Restore config_rom image and manually update
+ * config_rom registers. Writing the header quadlet
+ * will indicate that the config rom is ready, so we
+ * do that last. */
+ reg_write(ohci, OHCI1394_BusOptions,
+ be32_to_cpu(ohci->config_rom[2]));
+ ohci->config_rom[0] = cpu_to_be32(ohci->next_header);
+ reg_write(ohci, OHCI1394_ConfigROMhdr, ohci->next_header);
+ }
+
+ spin_unlock_irqrestore(&ohci->lock, flags);
+
+ fw_core_handle_bus_reset(&ohci->card, ohci->node_id, generation,
+ self_id_count, ohci->self_id_buffer);
+}
+
+static irqreturn_t irq_handler(int irq, void *data)
+{
+ struct fw_ohci *ohci = data;
+ u32 event, iso_event, cycle_time;
+ int i;
+
+ event = reg_read(ohci, OHCI1394_IntEventClear);
+
+ if (!event)
+ return IRQ_NONE;
+
+ reg_write(ohci, OHCI1394_IntEventClear, event);
+
+ if (event & OHCI1394_selfIDComplete)
+ tasklet_schedule(&ohci->bus_reset_tasklet);
+
+ if (event & OHCI1394_RQPkt)
+ tasklet_schedule(&ohci->ar_request_ctx.tasklet);
+
+ if (event & OHCI1394_RSPkt)
+ tasklet_schedule(&ohci->ar_response_ctx.tasklet);
+
+ if (event & OHCI1394_reqTxComplete)
+ tasklet_schedule(&ohci->at_request_ctx.tasklet);
+
+ if (event & OHCI1394_respTxComplete)
+ tasklet_schedule(&ohci->at_response_ctx.tasklet);
+
+ iso_event = reg_read(ohci, OHCI1394_IsoRecvIntEventClear);
+ reg_write(ohci, OHCI1394_IsoRecvIntEventClear, iso_event);
+
+ while (iso_event) {
+ i = ffs(iso_event) - 1;
+ tasklet_schedule(&ohci->ir_context_list[i].context.tasklet);
+ iso_event &= ~(1 << i);
+ }
+
+ iso_event = reg_read(ohci, OHCI1394_IsoXmitIntEventClear);
+ reg_write(ohci, OHCI1394_IsoXmitIntEventClear, iso_event);
+
+ while (iso_event) {
+ i = ffs(iso_event) - 1;
+ tasklet_schedule(&ohci->it_context_list[i].context.tasklet);
+ iso_event &= ~(1 << i);
+ }
+
+ if (event & OHCI1394_cycle64Seconds) {
+ cycle_time = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
+ if ((cycle_time & 0x80000000) == 0)
+ ohci->bus_seconds++;
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int ohci_enable(struct fw_card *card, u32 *config_rom, size_t length)
+{
+ struct fw_ohci *ohci = fw_ohci(card);
+ struct pci_dev *dev = to_pci_dev(card->device);
+
+ /* When the link is not yet enabled, the atomic config rom
+ * update mechanism described below in ohci_set_config_rom()
+ * is not active. We have to update ConfigRomHeader and
+ * BusOptions manually, and the write to ConfigROMmap takes
+ * effect immediately. We tie this to the enabling of the
+ * link, so we have a valid config rom before enabling - the
+ * OHCI requires that ConfigROMhdr and BusOptions have valid
+ * values before enabling.
+ *
+ * However, when the ConfigROMmap is written, some controllers
+ * always read back quadlets 0 and 2 from the config rom to
+ * the ConfigRomHeader and BusOptions registers on bus reset.
+ * They shouldn't do that in this initial case where the link
+ * isn't enabled. This means we have to use the same
+ * workaround here, setting the bus header to 0 and then write
+ * the right values in the bus reset tasklet.
+ */
+
+ ohci->next_config_rom =
+ dma_alloc_coherent(ohci->card.device, CONFIG_ROM_SIZE,
+ &ohci->next_config_rom_bus, GFP_KERNEL);
+ if (ohci->next_config_rom == NULL)
+ return -ENOMEM;
+
+ memset(ohci->next_config_rom, 0, CONFIG_ROM_SIZE);
+ fw_memcpy_to_be32(ohci->next_config_rom, config_rom, length * 4);
+
+ ohci->next_header = config_rom[0];
+ ohci->next_config_rom[0] = 0;
+ reg_write(ohci, OHCI1394_ConfigROMhdr, 0);
+ reg_write(ohci, OHCI1394_BusOptions, config_rom[2]);
+ reg_write(ohci, OHCI1394_ConfigROMmap, ohci->next_config_rom_bus);
+
+ reg_write(ohci, OHCI1394_AsReqFilterHiSet, 0x80000000);
+
+ if (request_irq(dev->irq, irq_handler,
+ IRQF_SHARED, ohci_driver_name, ohci)) {
+ fw_error("Failed to allocate shared interrupt %d.\n",
+ dev->irq);
+ dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
+ ohci->config_rom, ohci->config_rom_bus);
+ return -EIO;
+ }
+
+ reg_write(ohci, OHCI1394_HCControlSet,
+ OHCI1394_HCControl_linkEnable |
+ OHCI1394_HCControl_BIBimageValid);
+ flush_writes(ohci);
+
+ /* We are ready to go, initiate bus reset to finish the
+ * initialization. */
+
+ fw_core_initiate_bus_reset(&ohci->card, 1);
+
+ return 0;
+}
+
+static int
+ohci_set_config_rom(struct fw_card *card, u32 *config_rom, size_t length)
+{
+ struct fw_ohci *ohci;
+ unsigned long flags;
+ int retval = 0;
+ __be32 *next_config_rom;
+ dma_addr_t next_config_rom_bus;
+
+ ohci = fw_ohci(card);
+
+ /* When the OHCI controller is enabled, the config rom update
+ * mechanism is a bit tricky, but easy enough to use. See
+ * section 5.5.6 in the OHCI specification.
+ *
+ * The OHCI controller caches the new config rom address in a
+ * shadow register (ConfigROMmapNext) and needs a bus reset
+ * for the changes to take place. When the bus reset is
+ * detected, the controller loads the new values for the
+ * ConfigRomHeader and BusOptions registers from the specified
+ * config rom and loads ConfigROMmap from the ConfigROMmapNext
+ * shadow register. All automatically and atomically.
+ *
+ * Now, there's a twist to this story. The automatic load of
+ * ConfigRomHeader and BusOptions doesn't honor the
+ * noByteSwapData bit, so with a be32 config rom, the
+ * controller will load be32 values in to these registers
+ * during the atomic update, even on litte endian
+ * architectures. The workaround we use is to put a 0 in the
+ * header quadlet; 0 is endian agnostic and means that the
+ * config rom isn't ready yet. In the bus reset tasklet we
+ * then set up the real values for the two registers.
+ *
+ * We use ohci->lock to avoid racing with the code that sets
+ * ohci->next_config_rom to NULL (see bus_reset_tasklet).
+ */
+
+ next_config_rom =
+ dma_alloc_coherent(ohci->card.device, CONFIG_ROM_SIZE,
+ &next_config_rom_bus, GFP_KERNEL);
+ if (next_config_rom == NULL)
+ return -ENOMEM;
+
+ spin_lock_irqsave(&ohci->lock, flags);
+
+ if (ohci->next_config_rom == NULL) {
+ ohci->next_config_rom = next_config_rom;
+ ohci->next_config_rom_bus = next_config_rom_bus;
+
+ memset(ohci->next_config_rom, 0, CONFIG_ROM_SIZE);
+ fw_memcpy_to_be32(ohci->next_config_rom, config_rom,
+ length * 4);
+
+ ohci->next_header = config_rom[0];
+ ohci->next_config_rom[0] = 0;
+
+ reg_write(ohci, OHCI1394_ConfigROMmap,
+ ohci->next_config_rom_bus);
+ } else {
+ dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
+ next_config_rom, next_config_rom_bus);
+ retval = -EBUSY;
+ }
+
+ spin_unlock_irqrestore(&ohci->lock, flags);
+
+ /* Now initiate a bus reset to have the changes take
+ * effect. We clean up the old config rom memory and DMA
+ * mappings in the bus reset tasklet, since the OHCI
+ * controller could need to access it before the bus reset
+ * takes effect. */
+ if (retval == 0)
+ fw_core_initiate_bus_reset(&ohci->card, 1);
+
+ return retval;
+}
+
+static void ohci_send_request(struct fw_card *card, struct fw_packet *packet)
+{
+ struct fw_ohci *ohci = fw_ohci(card);
+
+ at_context_transmit(&ohci->at_request_ctx, packet);
+}
+
+static void ohci_send_response(struct fw_card *card, struct fw_packet *packet)
+{
+ struct fw_ohci *ohci = fw_ohci(card);
+
+ at_context_transmit(&ohci->at_response_ctx, packet);
+}
+
+static int ohci_cancel_packet(struct fw_card *card, struct fw_packet *packet)
+{
+ struct fw_ohci *ohci = fw_ohci(card);
+ struct context *ctx = &ohci->at_request_ctx;
+ struct driver_data *driver_data = packet->driver_data;
+ int retval = -ENOENT;
+
+ tasklet_disable(&ctx->tasklet);
+
+ if (packet->ack != 0)
+ goto out;
+
+ driver_data->packet = NULL;
+ packet->ack = RCODE_CANCELLED;
+ packet->callback(packet, &ohci->card, packet->ack);
+ retval = 0;
+
+ out:
+ tasklet_enable(&ctx->tasklet);
+
+ return retval;
+}
+
+static int
+ohci_enable_phys_dma(struct fw_card *card, int node_id, int generation)
+{
+ struct fw_ohci *ohci = fw_ohci(card);
+ unsigned long flags;
+ int n, retval = 0;
+
+ /* FIXME: Make sure this bitmask is cleared when we clear the busReset
+ * interrupt bit. Clear physReqResourceAllBuses on bus reset. */
+
+ spin_lock_irqsave(&ohci->lock, flags);
+
+ if (ohci->generation != generation) {
+ retval = -ESTALE;
+ goto out;
+ }
+
+ /* NOTE, if the node ID contains a non-local bus ID, physical DMA is
+ * enabled for _all_ nodes on remote buses. */
+
+ n = (node_id & 0xffc0) == LOCAL_BUS ? node_id & 0x3f : 63;
+ if (n < 32)
+ reg_write(ohci, OHCI1394_PhyReqFilterLoSet, 1 << n);
+ else
+ reg_write(ohci, OHCI1394_PhyReqFilterHiSet, 1 << (n - 32));
+
+ flush_writes(ohci);
+ out:
+ spin_unlock_irqrestore(&ohci->lock, flags);
+ return retval;
+}
+
+static u64
+ohci_get_bus_time(struct fw_card *card)
+{
+ struct fw_ohci *ohci = fw_ohci(card);
+ u32 cycle_time;
+ u64 bus_time;
+
+ cycle_time = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
+ bus_time = ((u64) ohci->bus_seconds << 32) | cycle_time;
+
+ return bus_time;
+}
+
+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;
+ 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 = 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) {
+ /* The iso header is byteswapped to little endian by
+ * the controller, but the remaining header quadlets
+ * are big endian. We want to present all the headers
+ * as big endian, so we have to swap the first
+ * quadlet. */
+ *(u32 *) (ctx->header + i) = __swab32(*(u32 *) (p + 4));
+ memcpy(ctx->header + i + 4, p + 8, ctx->base.header_size - 4);
+ i += ctx->base.header_size;
+ p += ctx->base.header_size + 4;
+ }
+
+ ctx->header_length = i;
+
+ 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_it_packet(struct context *context,
+ struct descriptor *d,
+ struct descriptor *last)
+{
+ struct iso_context *ctx =
+ container_of(context, struct iso_context, context);
+
+ if (last->transfer_status == 0)
+ /* This descriptor isn't done yet, stop iteration. */
+ 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 struct fw_iso_context *
+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;
+ descriptor_callback_t callback;
+ u32 *mask, regs;
+ unsigned long flags;
+ int index, retval = -ENOMEM;
+
+ if (type == FW_ISO_CONTEXT_TRANSMIT) {
+ mask = &ohci->it_context_mask;
+ list = ohci->it_context_list;
+ callback = handle_it_packet;
+ } else {
+ mask = &ohci->ir_context_mask;
+ list = ohci->ir_context_list;
+ 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);
+
+ spin_lock_irqsave(&ohci->lock, flags);
+ index = ffs(*mask) - 1;
+ if (index >= 0)
+ *mask &= ~(1 << index);
+ spin_unlock_irqrestore(&ohci->lock, flags);
+
+ if (index < 0)
+ return ERR_PTR(-EBUSY);
+
+ if (type == FW_ISO_CONTEXT_TRANSMIT)
+ regs = OHCI1394_IsoXmitContextBase(index);
+ else
+ regs = OHCI1394_IsoRcvContextBase(index);
+
+ ctx = &list[index];
+ memset(ctx, 0, sizeof *ctx);
+ ctx->header_length = 0;
+ ctx->header = (void *) __get_free_page(GFP_KERNEL);
+ if (ctx->header == NULL)
+ goto out;
+
+ retval = context_init(&ctx->context, ohci, ISO_BUFFER_SIZE,
+ regs, callback);
+ if (retval < 0)
+ goto out_with_header;
+
+ return &ctx->base;
+
+ out_with_header:
+ free_page((unsigned long)ctx->header);
+ out:
+ spin_lock_irqsave(&ohci->lock, flags);
+ *mask |= 1 << index;
+ spin_unlock_irqrestore(&ohci->lock, flags);
+
+ return ERR_PTR(retval);
+}
+
+static int ohci_start_iso(struct fw_iso_context *base,
+ s32 cycle, u32 sync, u32 tags)
+{
+ struct iso_context *ctx = container_of(base, struct iso_context, base);
+ struct fw_ohci *ohci = ctx->context.ohci;
+ u32 control, match;
+ int index;
+
+ if (ctx->base.type == FW_ISO_CONTEXT_TRANSMIT) {
+ index = ctx - ohci->it_context_list;
+ match = 0;
+ if (cycle >= 0)
+ match = IT_CONTEXT_CYCLE_MATCH_ENABLE |
+ (cycle & 0x7fff) << 16;
+
+ reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 1 << index);
+ reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1 << index);
+ context_run(&ctx->context, match);
+ } else {
+ index = ctx - ohci->ir_context_list;
+ control = IR_CONTEXT_DUAL_BUFFER_MODE | IR_CONTEXT_ISOCH_HEADER;
+ match = (tags << 28) | (sync << 8) | ctx->base.channel;
+ if (cycle >= 0) {
+ match |= (cycle & 0x07fff) << 12;
+ control |= IR_CONTEXT_CYCLE_MATCH_ENABLE;
+ }
+
+ reg_write(ohci, OHCI1394_IsoRecvIntEventClear, 1 << index);
+ reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1 << index);
+ reg_write(ohci, context_match(ctx->context.regs), match);
+ context_run(&ctx->context, control);
+ }
+
+ return 0;
+}
+
+static int ohci_stop_iso(struct fw_iso_context *base)
+{
+ struct fw_ohci *ohci = fw_ohci(base->card);
+ struct iso_context *ctx = container_of(base, struct iso_context, base);
+ int index;
+
+ if (ctx->base.type == FW_ISO_CONTEXT_TRANSMIT) {
+ index = ctx - ohci->it_context_list;
+ reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, 1 << index);
+ } else {
+ index = ctx - ohci->ir_context_list;
+ reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, 1 << index);
+ }
+ flush_writes(ohci);
+ context_stop(&ctx->context);
+
+ return 0;
+}
+
+static void ohci_free_iso_context(struct fw_iso_context *base)
+{
+ struct fw_ohci *ohci = fw_ohci(base->card);
+ struct iso_context *ctx = container_of(base, struct iso_context, base);
+ unsigned long flags;
+ int index;
+
+ ohci_stop_iso(base);
+ context_release(&ctx->context);
+ free_page((unsigned long)ctx->header);
+
+ spin_lock_irqsave(&ohci->lock, flags);
+
+ if (ctx->base.type == FW_ISO_CONTEXT_TRANSMIT) {
+ index = ctx - ohci->it_context_list;
+ ohci->it_context_mask |= 1 << index;
+ } else {
+ index = ctx - ohci->ir_context_list;
+ ohci->ir_context_mask |= 1 << index;
+ }
+
+ spin_unlock_irqrestore(&ohci->lock, flags);
+}
+
+static int
+ohci_queue_iso_transmit(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, *last, *pd;
+ struct fw_iso_packet *p;
+ __le32 *header;
+ dma_addr_t d_bus, page_bus;
+ u32 z, header_z, payload_z, irq;
+ u32 payload_index, payload_end_index, next_page_index;
+ int page, end_page, i, length, offset;
+
+ /* FIXME: Cycle lost behavior should be configurable: lose
+ * packet, retransmit or terminate.. */
+
+ p = packet;
+ payload_index = payload;
+
+ if (p->skip)
+ z = 1;
+ else
+ z = 2;
+ if (p->header_length > 0)
+ z++;
+
+ /* Determine the first page the payload isn't contained in. */
+ end_page = PAGE_ALIGN(payload_index + p->payload_length) >> PAGE_SHIFT;
+ if (p->payload_length > 0)
+ payload_z = end_page - (payload_index >> PAGE_SHIFT);
+ else
+ payload_z = 0;
+
+ z += payload_z;
+
+ /* Get header size in number of descriptors. */
+ header_z = DIV_ROUND_UP(p->header_length, sizeof *d);
+
+ d = context_get_descriptors(&ctx->context, z + header_z, &d_bus);
+ if (d == NULL)
+ return -ENOMEM;
+
+ if (!p->skip) {
+ d[0].control = cpu_to_le16(descriptor_key_immediate);
+ d[0].req_count = cpu_to_le16(8);
+
+ header = (__le32 *) &d[1];
+ header[0] = cpu_to_le32(it_header_sy(p->sy) |
+ it_header_tag(p->tag) |
+ it_header_tcode(TCODE_STREAM_DATA) |
+ it_header_channel(ctx->base.channel) |
+ it_header_speed(ctx->base.speed));
+ header[1] =
+ cpu_to_le32(it_header_data_length(p->header_length +
+ p->payload_length));
+ }
+
+ if (p->header_length > 0) {
+ d[2].req_count = cpu_to_le16(p->header_length);
+ d[2].data_address = cpu_to_le32(d_bus + z * sizeof *d);
+ memcpy(&d[z], p->header, p->header_length);
+ }
+
+ pd = d + z - payload_z;
+ payload_end_index = payload_index + p->payload_length;
+ for (i = 0; i < payload_z; i++) {
+ page = payload_index >> PAGE_SHIFT;
+ offset = payload_index & ~PAGE_MASK;
+ next_page_index = (page + 1) << PAGE_SHIFT;
+ length =
+ min(next_page_index, payload_end_index) - payload_index;
+ pd[i].req_count = cpu_to_le16(length);
+
+ page_bus = page_private(buffer->pages[page]);
+ pd[i].data_address = cpu_to_le32(page_bus + offset);
+
+ payload_index += length;
+ }
+
+ if (p->interrupt)
+ irq = descriptor_irq_always;
+ else
+ irq = descriptor_no_irq;
+
+ last = z == 2 ? d : d + z - 1;
+ last->control |= cpu_to_le16(descriptor_output_last |
+ descriptor_status |
+ descriptor_branch_always |
+ irq);
+
+ context_append(&ctx->context, d, z, header_z);
+
+ 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.. */
+
+ 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(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: make packet-per-buffer/dual-buffer a context option */
+ 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(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);
+
+ 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;
+ page++;
+ }
+
+ return 0;
+}
+
+static int
+ohci_queue_iso(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);
+
+ if (base->type == FW_ISO_CONTEXT_TRANSMIT)
+ return ohci_queue_iso_transmit(base, packet, buffer, payload);
+ else if (ctx->context.ohci->version >= OHCI_VERSION_1_1)
+ return ohci_queue_iso_receive_dualbuffer(base, packet,
+ buffer, payload);
+ else
+ /* FIXME: Implement fallback for OHCI 1.0 controllers. */
+ return -EINVAL;
+}
+
+static const struct fw_card_driver ohci_driver = {
+ .name = ohci_driver_name,
+ .enable = ohci_enable,
+ .update_phy_reg = ohci_update_phy_reg,
+ .set_config_rom = ohci_set_config_rom,
+ .send_request = ohci_send_request,
+ .send_response = ohci_send_response,
+ .cancel_packet = ohci_cancel_packet,
+ .enable_phys_dma = ohci_enable_phys_dma,
+ .get_bus_time = ohci_get_bus_time,
+
+ .allocate_iso_context = ohci_allocate_iso_context,
+ .free_iso_context = ohci_free_iso_context,
+ .queue_iso = ohci_queue_iso,
+ .start_iso = ohci_start_iso,
+ .stop_iso = ohci_stop_iso,
+};
+
+static int software_reset(struct fw_ohci *ohci)
+{
+ int i;
+
+ reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_softReset);
+
+ for (i = 0; i < OHCI_LOOP_COUNT; i++) {
+ if ((reg_read(ohci, OHCI1394_HCControlSet) &
+ OHCI1394_HCControl_softReset) == 0)
+ return 0;
+ msleep(1);
+ }
+
+ return -EBUSY;
+}
+
+/* ---------- pci subsystem interface ---------- */
+
+enum {
+ CLEANUP_SELF_ID,
+ CLEANUP_REGISTERS,
+ CLEANUP_IOMEM,
+ CLEANUP_DISABLE,
+ CLEANUP_PUT_CARD,
+};
+
+static int cleanup(struct fw_ohci *ohci, int stage, int code)
+{
+ struct pci_dev *dev = to_pci_dev(ohci->card.device);
+
+ switch (stage) {
+ case CLEANUP_SELF_ID:
+ dma_free_coherent(ohci->card.device, SELF_ID_BUF_SIZE,
+ ohci->self_id_cpu, ohci->self_id_bus);
+ case CLEANUP_REGISTERS:
+ kfree(ohci->it_context_list);
+ kfree(ohci->ir_context_list);
+ pci_iounmap(dev, ohci->registers);
+ case CLEANUP_IOMEM:
+ pci_release_region(dev, 0);
+ case CLEANUP_DISABLE:
+ pci_disable_device(dev);
+ case CLEANUP_PUT_CARD:
+ fw_card_put(&ohci->card);
+ }
+
+ return code;
+}
+
+static int __devinit
+pci_probe(struct pci_dev *dev, const struct pci_device_id *ent)
+{
+ struct fw_ohci *ohci;
+ u32 bus_options, max_receive, link_speed;
+ u64 guid;
+ int error_code;
+ size_t size;
+
+ ohci = kzalloc(sizeof *ohci, GFP_KERNEL);
+ if (ohci == NULL) {
+ fw_error("Could not malloc fw_ohci data.\n");
+ return -ENOMEM;
+ }
+
+ fw_card_initialize(&ohci->card, &ohci_driver, &dev->dev);
+
+ if (pci_enable_device(dev)) {
+ fw_error("Failed to enable OHCI hardware.\n");
+ return cleanup(ohci, CLEANUP_PUT_CARD, -ENODEV);
+ }
+
+ pci_set_master(dev);
+ pci_write_config_dword(dev, OHCI1394_PCI_HCI_Control, 0);
+ pci_set_drvdata(dev, ohci);
+
+ spin_lock_init(&ohci->lock);
+
+ tasklet_init(&ohci->bus_reset_tasklet,
+ bus_reset_tasklet, (unsigned long)ohci);
+
+ if (pci_request_region(dev, 0, ohci_driver_name)) {
+ fw_error("MMIO resource unavailable\n");
+ return cleanup(ohci, CLEANUP_DISABLE, -EBUSY);
+ }
+
+ ohci->registers = pci_iomap(dev, 0, OHCI1394_REGISTER_SIZE);
+ if (ohci->registers == NULL) {
+ fw_error("Failed to remap registers\n");
+ return cleanup(ohci, CLEANUP_IOMEM, -ENXIO);
+ }
+
+ if (software_reset(ohci)) {
+ fw_error("Failed to reset ohci card.\n");
+ return cleanup(ohci, CLEANUP_REGISTERS, -EBUSY);
+ }
+
+ /* Now enable LPS, which we need in order to start accessing
+ * most of the registers. In fact, on some cards (ALI M5251),
+ * accessing registers in the SClk domain without LPS enabled
+ * will lock up the machine. Wait 50msec to make sure we have
+ * full link enabled. */
+ reg_write(ohci, OHCI1394_HCControlSet,
+ OHCI1394_HCControl_LPS |
+ OHCI1394_HCControl_postedWriteEnable);
+ flush_writes(ohci);
+ msleep(50);
+
+ reg_write(ohci, OHCI1394_HCControlClear,
+ OHCI1394_HCControl_noByteSwapData);
+
+ reg_write(ohci, OHCI1394_LinkControlSet,
+ OHCI1394_LinkControl_rcvSelfID |
+ OHCI1394_LinkControl_cycleTimerEnable |
+ OHCI1394_LinkControl_cycleMaster);
+
+ ar_context_init(&ohci->ar_request_ctx, ohci,
+ OHCI1394_AsReqRcvContextControlSet);
+
+ ar_context_init(&ohci->ar_response_ctx, ohci,
+ OHCI1394_AsRspRcvContextControlSet);
+
+ context_init(&ohci->at_request_ctx, ohci, AT_BUFFER_SIZE,
+ OHCI1394_AsReqTrContextControlSet, handle_at_packet);
+
+ context_init(&ohci->at_response_ctx, ohci, AT_BUFFER_SIZE,
+ OHCI1394_AsRspTrContextControlSet, handle_at_packet);
+
+ reg_write(ohci, OHCI1394_ATRetries,
+ OHCI1394_MAX_AT_REQ_RETRIES |
+ (OHCI1394_MAX_AT_RESP_RETRIES << 4) |
+ (OHCI1394_MAX_PHYS_RESP_RETRIES << 8));
+
+ reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, ~0);
+ ohci->it_context_mask = reg_read(ohci, OHCI1394_IsoRecvIntMaskSet);
+ reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, ~0);
+ size = sizeof(struct iso_context) * hweight32(ohci->it_context_mask);
+ ohci->it_context_list = kzalloc(size, GFP_KERNEL);
+
+ reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, ~0);
+ ohci->ir_context_mask = reg_read(ohci, OHCI1394_IsoXmitIntMaskSet);
+ reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, ~0);
+ size = sizeof(struct iso_context) * hweight32(ohci->ir_context_mask);
+ ohci->ir_context_list = kzalloc(size, GFP_KERNEL);
+
+ if (ohci->it_context_list == NULL || ohci->ir_context_list == NULL) {
+ fw_error("Out of memory for it/ir contexts.\n");
+ return cleanup(ohci, CLEANUP_REGISTERS, -ENOMEM);
+ }
+
+ /* self-id dma buffer allocation */
+ ohci->self_id_cpu = dma_alloc_coherent(ohci->card.device,
+ SELF_ID_BUF_SIZE,
+ &ohci->self_id_bus,
+ GFP_KERNEL);
+ if (ohci->self_id_cpu == NULL) {
+ fw_error("Out of memory for self ID buffer.\n");
+ return cleanup(ohci, CLEANUP_REGISTERS, -ENOMEM);
+ }
+
+ reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->self_id_bus);
+ reg_write(ohci, OHCI1394_PhyUpperBound, 0x00010000);
+ reg_write(ohci, OHCI1394_IntEventClear, ~0);
+ reg_write(ohci, OHCI1394_IntMaskClear, ~0);
+ reg_write(ohci, OHCI1394_IntMaskSet,
+ OHCI1394_selfIDComplete |
+ OHCI1394_RQPkt | OHCI1394_RSPkt |
+ OHCI1394_reqTxComplete | OHCI1394_respTxComplete |
+ OHCI1394_isochRx | OHCI1394_isochTx |
+ OHCI1394_masterIntEnable |
+ OHCI1394_cycle64Seconds);
+
+ bus_options = reg_read(ohci, OHCI1394_BusOptions);
+ max_receive = (bus_options >> 12) & 0xf;
+ link_speed = bus_options & 0x7;
+ guid = ((u64) reg_read(ohci, OHCI1394_GUIDHi) << 32) |
+ reg_read(ohci, OHCI1394_GUIDLo);
+
+ error_code = fw_card_add(&ohci->card, max_receive, link_speed, guid);
+ if (error_code < 0)
+ return cleanup(ohci, CLEANUP_SELF_ID, error_code);
+
+ ohci->version = reg_read(ohci, OHCI1394_Version) & 0x00ff00ff;
+ fw_notify("Added fw-ohci device %s, OHCI version %x.%x\n",
+ dev->dev.bus_id, ohci->version >> 16, ohci->version & 0xff);
+
+ return 0;
+}
+
+static void pci_remove(struct pci_dev *dev)
+{
+ struct fw_ohci *ohci;
+
+ ohci = pci_get_drvdata(dev);
+ reg_write(ohci, OHCI1394_IntMaskClear, ~0);
+ flush_writes(ohci);
+ fw_core_remove_card(&ohci->card);
+
+ /* FIXME: Fail all pending packets here, now that the upper
+ * layers can't queue any more. */
+
+ software_reset(ohci);
+ free_irq(dev->irq, ohci);
+ cleanup(ohci, CLEANUP_SELF_ID, 0);
+
+ fw_notify("Removed fw-ohci device.\n");
+}
+
+static struct pci_device_id pci_table[] = {
+ { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_FIREWIRE_OHCI, ~0) },
+ { }
+};
+
+MODULE_DEVICE_TABLE(pci, pci_table);
+
+static struct pci_driver fw_ohci_pci_driver = {
+ .name = ohci_driver_name,
+ .id_table = pci_table,
+ .probe = pci_probe,
+ .remove = pci_remove,
+};
+
+MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
+MODULE_DESCRIPTION("Driver for PCI OHCI IEEE1394 controllers");
+MODULE_LICENSE("GPL");
+
+static int __init fw_ohci_init(void)
+{
+ return pci_register_driver(&fw_ohci_pci_driver);
+}
+
+static void __exit fw_ohci_cleanup(void)
+{
+ pci_unregister_driver(&fw_ohci_pci_driver);
+}
+
+module_init(fw_ohci_init);
+module_exit(fw_ohci_cleanup);

--
Stefan Richter
-=====-=-=== -=-= ---=-