pcilynx.c

Ieee1394驱动实现

                        lsid |= 1 << (6 - i*2);
                }
        }

        cpu_to_be32s(&lsid);
        PRINT(KERN_DEBUG, lynx->id, "generated own selfid 0x%x", lsid);
        return lsid;
}

static void handle_selfid(struct ti_lynx *lynx, struct hpsb_host *host)
{
        quadlet_t *q = lynx->rcv_page;
        int phyid, isroot, size;
        quadlet_t lsid = 0;
        int i;

        if (lynx->phy_reg0 == -1 || lynx->selfid_size == -1) return;

        size = lynx->selfid_size;
        phyid = lynx->phy_reg0;

        i = (size > 16 ? 16 : size) / 4 - 1;
        while (i >= 0) {
                cpu_to_be32s(&q[i]);
                i--;
        }

        if (!lynx->phyic.reg_1394a) {
                lsid = generate_own_selfid(lynx, host);
        }

        isroot = (phyid & 2) != 0;
        phyid >>= 2;
        PRINT(KERN_INFO, lynx->id, "SelfID process finished (phyid %d, %s)",
              phyid, (isroot ? "root" : "not root"));
        reg_write(lynx, LINK_ID, (0xffc0 | phyid) << 16);

        if (!lynx->phyic.reg_1394a && !size) {
                hpsb_selfid_received(host, lsid);
        }

        while (size > 0) {
                struct selfid *sid = (struct selfid *)q;

                if (!lynx->phyic.reg_1394a && !sid->extended
                    && (sid->phy_id == (phyid + 1))) {
                        hpsb_selfid_received(host, lsid);
                }

                if (q[0] == ~q[1]) {
                        PRINT(KERN_DEBUG, lynx->id, "SelfID packet 0x%x rcvd",
                              q[0]);
                        hpsb_selfid_received(host, q[0]);
                } else {
                        PRINT(KERN_INFO, lynx->id,
                              "inconsistent selfid 0x%x/0x%x", q[0], q[1]);
                }
                q += 2;
                size -= 8;
        }

        if (!lynx->phyic.reg_1394a && isroot && phyid != 0) {
                hpsb_selfid_received(host, lsid);
        }

        hpsb_selfid_complete(host, phyid, isroot);

        if (host->in_bus_reset) return; /* in bus reset again */

        if (isroot) reg_set_bits(lynx, LINK_CONTROL, LINK_CONTROL_CYCMASTER); //FIXME: I do not think, we need this here
        reg_set_bits(lynx, LINK_CONTROL,
                     LINK_CONTROL_RCV_CMP_VALID | LINK_CONTROL_TX_ASYNC_EN
                     | LINK_CONTROL_RX_ASYNC_EN | LINK_CONTROL_CYCTIMEREN);
}



/* This must be called with the respective queue_lock held. */
static void send_next(struct ti_lynx *lynx, int what)
{
        struct ti_pcl pcl;
        struct lynx_send_data *d;
        struct hpsb_packet *packet;

#if 0 /* has been removed from ieee1394 core */
        d = (what == hpsb_iso ? &lynx->iso_send : &lynx->async);
#else
	d = &lynx->async;
#endif
        if (!list_empty(&d->pcl_queue)) {
                PRINT(KERN_ERR, lynx->id, "trying to queue a new packet in nonempty fifo");
                BUG();
        }

        packet = driver_packet(d->queue.next);
	list_move_tail(&packet->driver_list, &d->pcl_queue);

        d->header_dma = pci_map_single(lynx->dev, packet->header,
                                       packet->header_size, PCI_DMA_TODEVICE);
        if (packet->data_size) {
                d->data_dma = pci_map_single(lynx->dev, packet->data,
                                             packet->data_size,
                                             PCI_DMA_TODEVICE);
        } else {
                d->data_dma = 0;
        }

        pcl.next = PCL_NEXT_INVALID;
        pcl.async_error_next = PCL_NEXT_INVALID;
        pcl.pcl_status = 0;
        pcl.buffer[0].control = packet->speed_code << 14 | packet->header_size;
#ifndef __BIG_ENDIAN
        pcl.buffer[0].control |= PCL_BIGENDIAN;
#endif
        pcl.buffer[0].pointer = d->header_dma;
        pcl.buffer[1].control = PCL_LAST_BUFF | packet->data_size;
        pcl.buffer[1].pointer = d->data_dma;

        switch (packet->type) {
        case hpsb_async:
                pcl.buffer[0].control |= PCL_CMD_XMT;
                break;
#if 0 /* has been removed from ieee1394 core */
        case hpsb_iso:
                pcl.buffer[0].control |= PCL_CMD_XMT | PCL_ISOMODE;
                break;
#endif
        case hpsb_raw:
                pcl.buffer[0].control |= PCL_CMD_UNFXMT;
                break;
        }

        put_pcl(lynx, d->pcl, &pcl);
        run_pcl(lynx, d->pcl_start, d->channel);
}


/* called from subsystem core */
static int lynx_transmit(struct hpsb_host *host, struct hpsb_packet *packet)
{
        struct ti_lynx *lynx = host->hostdata;
        struct lynx_send_data *d;
        unsigned long flags;

        if (packet->data_size >= 4096) {
                PRINT(KERN_ERR, lynx->id, "transmit packet data too big (%Zd)",
                      packet->data_size);
                return -EOVERFLOW;
        }

        switch (packet->type) {
        case hpsb_async:
        case hpsb_raw:
                d = &lynx->async;
                break;
#if 0 /* has been removed from ieee1394 core */
        case hpsb_iso:
                d = &lynx->iso_send;
                break;
#endif
        default:
                PRINT(KERN_ERR, lynx->id, "invalid packet type %d",
                      packet->type);
                return -EINVAL;
        }

        if (packet->tcode == TCODE_WRITEQ
            || packet->tcode == TCODE_READQ_RESPONSE) {
                cpu_to_be32s(&packet->header[3]);
        }

        spin_lock_irqsave(&d->queue_lock, flags);

	list_add_tail(&packet->driver_list, &d->queue);
	if (list_empty(&d->pcl_queue))
                send_next(lynx, packet->type);

        spin_unlock_irqrestore(&d->queue_lock, flags);

        return 0;
}


/* called from subsystem core */
static int lynx_devctl(struct hpsb_host *host, enum devctl_cmd cmd, int arg)
{
        struct ti_lynx *lynx = host->hostdata;
        int retval = 0;
        struct hpsb_packet *packet;
	LIST_HEAD(packet_list);
        unsigned long flags;
	int phy_reg;

        switch (cmd) {
        case RESET_BUS:
                if (reg_read(lynx, LINK_INT_STATUS) & LINK_INT_PHY_BUSRESET) {
                        retval = 0;
                        break;
                }

		switch (arg) {
		case SHORT_RESET:
			if (lynx->phyic.reg_1394a) {
				phy_reg = get_phy_reg(lynx, 5);
				if (phy_reg == -1) {
					PRINT(KERN_ERR, lynx->id, "cannot reset bus, because read phy reg failed");
					retval = -1;
					break;
				}
				phy_reg |= 0x40;

				PRINT(KERN_INFO, lynx->id, "resetting bus (short bus reset) on request");

				lynx->selfid_size = -1;
				lynx->phy_reg0 = -1;
				set_phy_reg(lynx, 5, phy_reg); /* set ISBR */
				break;
			} else {
				PRINT(KERN_INFO, lynx->id, "cannot do short bus reset, because of old phy");
				/* fall through to long bus reset */
			}
		case LONG_RESET:
			phy_reg = get_phy_reg(lynx, 1);
			if (phy_reg == -1) {
				PRINT(KERN_ERR, lynx->id, "cannot reset bus, because read phy reg failed");
				retval = -1;
				break;
			}
			phy_reg |= 0x40;

			PRINT(KERN_INFO, lynx->id, "resetting bus (long bus reset) on request");

			lynx->selfid_size = -1;
			lynx->phy_reg0 = -1;
			set_phy_reg(lynx, 1, phy_reg); /* clear RHB, set IBR */
			break;
		case SHORT_RESET_NO_FORCE_ROOT:
			if (lynx->phyic.reg_1394a) {
				phy_reg = get_phy_reg(lynx, 1);
				if (phy_reg == -1) {
					PRINT(KERN_ERR, lynx->id, "cannot reset bus, because read phy reg failed");
					retval = -1;
					break;
				}
				if (phy_reg & 0x80) {
					phy_reg &= ~0x80;
					set_phy_reg(lynx, 1, phy_reg); /* clear RHB */
				}

				phy_reg = get_phy_reg(lynx, 5);
				if (phy_reg == -1) {
					PRINT(KERN_ERR, lynx->id, "cannot reset bus, because read phy reg failed");
					retval = -1;
					break;
				}
				phy_reg |= 0x40;

				PRINT(KERN_INFO, lynx->id, "resetting bus (short bus reset, no force_root) on request");

				lynx->selfid_size = -1;
				lynx->phy_reg0 = -1;
				set_phy_reg(lynx, 5, phy_reg); /* set ISBR */
				break;
			} else {
				PRINT(KERN_INFO, lynx->id, "cannot do short bus reset, because of old phy");
				/* fall through to long bus reset */
			}
		case LONG_RESET_NO_FORCE_ROOT:
			phy_reg = get_phy_reg(lynx, 1);
			if (phy_reg == -1) {
				PRINT(KERN_ERR, lynx->id, "cannot reset bus, because read phy reg failed");
				retval = -1;
				break;
			}
			phy_reg &= ~0x80;
			phy_reg |= 0x40;

			PRINT(KERN_INFO, lynx->id, "resetting bus (long bus reset, no force_root) on request");

			lynx->selfid_size = -1;
			lynx->phy_reg0 = -1;
			set_phy_reg(lynx, 1, phy_reg); /* clear RHB, set IBR */
			break;
		case SHORT_RESET_FORCE_ROOT:
			if (lynx->phyic.reg_1394a) {
				phy_reg = get_phy_reg(lynx, 1);
				if (phy_reg == -1) {
					PRINT(KERN_ERR, lynx->id, "cannot reset bus, because read phy reg failed");
					retval = -1;
					break;
				}
				if (!(phy_reg & 0x80)) {
					phy_reg |= 0x80;
					set_phy_reg(lynx, 1, phy_reg); /* set RHB */
				}

				phy_reg = get_phy_reg(lynx, 5);
				if (phy_reg == -1) {
					PRINT(KERN_ERR, lynx->id, "cannot reset bus, because read phy reg failed");
					retval = -1;
					break;
				}
				phy_reg |= 0x40;

				PRINT(KERN_INFO, lynx->id, "resetting bus (short bus reset, force_root set) on request");

				lynx->selfid_size = -1;
				lynx->phy_reg0 = -1;
				set_phy_reg(lynx, 5, phy_reg); /* set ISBR */
				break;
			} else {
				PRINT(KERN_INFO, lynx->id, "cannot do short bus reset, because of old phy");
				/* fall through to long bus reset */
			}
		case LONG_RESET_FORCE_ROOT:
			phy_reg = get_phy_reg(lynx, 1);
			if (phy_reg == -1) {
				PRINT(KERN_ERR, lynx->id, "cannot reset bus, because read phy reg failed");
				retval = -1;
				break;
			}
			phy_reg |= 0xc0;

			PRINT(KERN_INFO, lynx->id, "resetting bus (long bus reset, force_root set) on request");

			lynx->selfid_size = -1;
			lynx->phy_reg0 = -1;
			set_phy_reg(lynx, 1, phy_reg); /* set IBR and RHB */
			break;
		default:
			PRINT(KERN_ERR, lynx->id, "unknown argument for reset_bus command %d", arg);
			retval = -1;
		}

                break;

        case GET_CYCLE_COUNTER:
                retval = reg_read(lynx, CYCLE_TIMER);
                break;

        case SET_CYCLE_COUNTER:
                reg_write(lynx, CYCLE_TIMER, arg);
                break;

        case SET_BUS_ID:
                reg_write(lynx, LINK_ID,
                          (arg << 22) | (reg_read(lynx, LINK_ID) & 0x003f0000));
                break;

        case ACT_CYCLE_MASTER:
                if (arg) {
                        reg_set_bits(lynx, LINK_CONTROL,
                                     LINK_CONTROL_CYCMASTER);
                } else {
                        reg_clear_bits(lynx, LINK_CONTROL,
                                       LINK_CONTROL_CYCMASTER);
                }
                break;

        case CANCEL_REQUESTS:
                spin_lock_irqsave(&lynx->async.queue_lock, flags);

                reg_write(lynx, DMA_CHAN_CTRL(CHANNEL_ASYNC_SEND), 0);
		list_splice(&lynx->async.queue, &packet_list);
		INIT_LIST_HEAD(&lynx->async.queue);

                if (list_empty(&lynx->async.pcl_queue)) {
                        spin_unlock_irqrestore(&lynx->async.queue_lock, flags);
                        PRINTD(KERN_DEBUG, lynx->id, "no async packet in PCL to cancel");
                } else {
                        struct ti_pcl pcl;
                        u32 ack;
                        struct hpsb_packet *packet;

                        PRINT(KERN_INFO, lynx->id, "cancelling async packet, that was already in PCL");

                        get_pcl(lynx, lynx->async.pcl, &pcl);

                        packet = driver_packet(lynx->async.pcl_queue.next);
			list_del_init(&packet->driver_list);

                        pci_unmap_single(lynx->dev, lynx->async.header_dma,
                                         packet->header_size, PCI_DMA_TODEVICE);
                        if (packet->data_size) {
                                pci_unmap_single(lynx->dev, lynx->async.data_dma,
                                                 packet->data_size, PCI_DMA_TODEVICE);
                        }

                        spin_unlock_irqrestore(&lynx->async.queue_lock, flags);

                        if (pcl.pcl_status & DMA_CHAN_STAT_PKTCMPL) {
                                if (pcl.pcl_status & DMA_CHAN_STAT_SPECIALACK) {
                                        ack = (pcl.pcl_status >> 15) & 0xf;
                                        PRINTD(KERN_INFO, lynx->id, "special ack %d", ack);
                                        ack = (ack == 1 ? ACKX_TIMEOUT : ACKX_SEND_ERROR);