/* * Driver for OHCI 1394 controllers * * Copyright (C) 2003-2006 Kristian Hoegsberg * * 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 #include #include #include #include #include #include #include #include #include #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; } 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 "); 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);