qlogicisp.c

讲述linux的初始化过程

	isp_outw(HCCR_CLEAR_RISC_INTR, host, HOST_HCCR);

	if ((isp_inw(host, PCI_SEMAPHORE) & ASYNC_EVENT_INTERRUPT)) {
		status = isp_inw(host, MBOX0);

		DEBUG_INTR(printk("qlogicisp : mbox completion status: %x\n",
				  status));

		switch (status) {
		      case ASYNC_SCSI_BUS_RESET:
		      case EXECUTION_TIMEOUT_RESET:
			hostdata->send_marker = 1;
			break;
		      case INVALID_COMMAND:
		      case HOST_INTERFACE_ERROR:
		      case COMMAND_ERROR:
		      case COMMAND_PARAM_ERROR:
			printk("qlogicisp : bad mailbox return status\n");
			break;
		}
		isp_outw(0x0, host, PCI_SEMAPHORE);
	}
	out_ptr = hostdata->res_out_ptr;

	DEBUG_INTR(printk("qlogicisp : response queue update\n"));
	DEBUG_INTR(printk("qlogicisp : response queue depth %d\n",
			  QUEUE_DEPTH(in_ptr, out_ptr, RES_QUEUE_LEN)));

	while (out_ptr != in_ptr) {
		u_int cmd_slot;

		sts = (struct Status_Entry *) &hostdata->res_cpu[out_ptr];
		out_ptr = (out_ptr + 1) & RES_QUEUE_LEN;

		cmd_slot = sts->handle;
		Cmnd = hostdata->cmd_slots[cmd_slot];
		hostdata->cmd_slots[cmd_slot] = NULL;

		TRACE("done", out_ptr, Cmnd);

		if (le16_to_cpu(sts->completion_status) == CS_RESET_OCCURRED
		    || le16_to_cpu(sts->completion_status) == CS_ABORTED
		    || (le16_to_cpu(sts->status_flags) & STF_BUS_RESET))
			hostdata->send_marker = 1;

		if (le16_to_cpu(sts->state_flags) & SF_GOT_SENSE)
			memcpy(Cmnd->sense_buffer, sts->req_sense_data,
			       sizeof(Cmnd->sense_buffer));

		DEBUG_INTR(isp1020_print_status_entry(sts));

		if (sts->hdr.entry_type == ENTRY_STATUS)
			Cmnd->result = isp1020_return_status(sts);
		else
			Cmnd->result = DID_ERROR << 16;

		if (Cmnd->use_sg)
			pci_unmap_sg(hostdata->pci_dev,
				     (struct scatterlist *)Cmnd->buffer,
				     Cmnd->use_sg,
				     scsi_to_pci_dma_dir(Cmnd->sc_data_direction));
		else if (Cmnd->request_bufflen)
			pci_unmap_single(hostdata->pci_dev,
#ifdef CONFIG_QL_ISP_A64
					 (dma_addr_t)((long)Cmnd->SCp.ptr),
#else
					 (u32)((long)Cmnd->SCp.ptr),
#endif
					 Cmnd->request_bufflen,
					 scsi_to_pci_dma_dir(Cmnd->sc_data_direction));

		isp_outw(out_ptr, host, MBOX5);
		(*Cmnd->scsi_done)(Cmnd);
	}
	hostdata->res_out_ptr = out_ptr;

	LEAVE_INTR("isp1020_intr_handler");
}


static int isp1020_return_status(struct Status_Entry *sts)
{
	int host_status = DID_ERROR;
#if DEBUG_ISP1020_INTR
	static char *reason[] = {
		"DID_OK",
		"DID_NO_CONNECT",
		"DID_BUS_BUSY",
		"DID_TIME_OUT",
		"DID_BAD_TARGET",
		"DID_ABORT",
		"DID_PARITY",
		"DID_ERROR",
		"DID_RESET",
		"DID_BAD_INTR"
	};
#endif /* DEBUG_ISP1020_INTR */

	ENTER("isp1020_return_status");

	DEBUG(printk("qlogicisp : completion status = 0x%04x\n",
		     le16_to_cpu(sts->completion_status)));

	switch(le16_to_cpu(sts->completion_status)) {
	      case CS_COMPLETE:
		host_status = DID_OK;
		break;
	      case CS_INCOMPLETE:
		if (!(le16_to_cpu(sts->state_flags) & SF_GOT_BUS))
			host_status = DID_NO_CONNECT;
		else if (!(le16_to_cpu(sts->state_flags) & SF_GOT_TARGET))
			host_status = DID_BAD_TARGET;
		else if (!(le16_to_cpu(sts->state_flags) & SF_SENT_CDB))
			host_status = DID_ERROR;
		else if (!(le16_to_cpu(sts->state_flags) & SF_TRANSFERRED_DATA))
			host_status = DID_ERROR;
		else if (!(le16_to_cpu(sts->state_flags) & SF_GOT_STATUS))
			host_status = DID_ERROR;
		else if (!(le16_to_cpu(sts->state_flags) & SF_GOT_SENSE))
			host_status = DID_ERROR;
		break;
	      case CS_DMA_ERROR:
	      case CS_TRANSPORT_ERROR:
		host_status = DID_ERROR;
		break;
	      case CS_RESET_OCCURRED:
		host_status = DID_RESET;
		break;
	      case CS_ABORTED:
		host_status = DID_ABORT;
		break;
	      case CS_TIMEOUT:
		host_status = DID_TIME_OUT;
		break;
	      case CS_DATA_OVERRUN:
	      case CS_COMMAND_OVERRUN:
	      case CS_STATUS_OVERRUN:
	      case CS_BAD_MESSAGE:
	      case CS_NO_MESSAGE_OUT:
	      case CS_EXT_ID_FAILED:
	      case CS_IDE_MSG_FAILED:
	      case CS_ABORT_MSG_FAILED:
	      case CS_NOP_MSG_FAILED:
	      case CS_PARITY_ERROR_MSG_FAILED:
	      case CS_DEVICE_RESET_MSG_FAILED:
	      case CS_ID_MSG_FAILED:
	      case CS_UNEXP_BUS_FREE:
		host_status = DID_ERROR;
		break;
	      case CS_DATA_UNDERRUN:
		host_status = DID_OK;
		break;
	      default:
		printk("qlogicisp : unknown completion status 0x%04x\n",
		       le16_to_cpu(sts->completion_status));
		host_status = DID_ERROR;
		break;
	}

	DEBUG_INTR(printk("qlogicisp : host status (%s) scsi status %x\n",
			  reason[host_status], le16_to_cpu(sts->scsi_status)));

	LEAVE("isp1020_return_status");

	return (le16_to_cpu(sts->scsi_status) & STATUS_MASK) | (host_status << 16);
}


int isp1020_abort(Scsi_Cmnd *Cmnd)
{
	u_short param[6];
	struct Scsi_Host *host;
	struct isp1020_hostdata *hostdata;
	int return_status = SCSI_ABORT_SUCCESS;
	u_int cmd_cookie;
	int i;

	ENTER("isp1020_abort");

	host = Cmnd->host;
	hostdata = (struct isp1020_hostdata *) host->hostdata;

	for (i = 0; i < QLOGICISP_REQ_QUEUE_LEN + 1; i++)
		if (hostdata->cmd_slots[i] == Cmnd)
			break;
	cmd_cookie = i;

	isp1020_disable_irqs(host);

	param[0] = MBOX_ABORT;
	param[1] = (((u_short) Cmnd->target) << 8) | Cmnd->lun;
	param[2] = cmd_cookie >> 16;
	param[3] = cmd_cookie & 0xffff;

	isp1020_mbox_command(host, param);

	if (param[0] != MBOX_COMMAND_COMPLETE) {
		printk("qlogicisp : scsi abort failure: %x\n", param[0]);
		return_status = SCSI_ABORT_ERROR;
	}

	isp1020_enable_irqs(host);

	LEAVE("isp1020_abort");

	return return_status;
}


int isp1020_reset(Scsi_Cmnd *Cmnd, unsigned int reset_flags)
{
	u_short param[6];
	struct Scsi_Host *host;
	struct isp1020_hostdata *hostdata;
	int return_status = SCSI_RESET_SUCCESS;

	ENTER("isp1020_reset");

	host = Cmnd->host;
	hostdata = (struct isp1020_hostdata *) host->hostdata;

	param[0] = MBOX_BUS_RESET;
	param[1] = hostdata->host_param.bus_reset_delay;

	isp1020_disable_irqs(host);

	isp1020_mbox_command(host, param);

	if (param[0] != MBOX_COMMAND_COMPLETE) {
		printk("qlogicisp : scsi bus reset failure: %x\n", param[0]);
		return_status = SCSI_RESET_ERROR;
	}

	isp1020_enable_irqs(host);

	LEAVE("isp1020_reset");

	return return_status;;
}


int isp1020_biosparam(Disk *disk, kdev_t n, int ip[])
{
	int size = disk->capacity;

	ENTER("isp1020_biosparam");

	ip[0] = 64;
	ip[1] = 32;
	ip[2] = size >> 11;
	if (ip[2] > 1024) {
		ip[0] = 255;
		ip[1] = 63;
		ip[2] = size / (ip[0] * ip[1]);
#if 0
		if (ip[2] > 1023)
			ip[2] = 1023;
#endif			
	}

	LEAVE("isp1020_biosparam");

	return 0;
}


static int isp1020_reset_hardware(struct Scsi_Host *host)
{
	u_short param[6];
	int loop_count;

	ENTER("isp1020_reset_hardware");

	isp_outw(ISP_RESET, host, PCI_INTF_CTL);
	udelay(100);
	isp_outw(HCCR_RESET, host, HOST_HCCR);
	udelay(100);
	isp_outw(HCCR_RELEASE, host, HOST_HCCR);
	isp_outw(HCCR_BIOS_DISABLE, host, HOST_HCCR);

	loop_count = DEFAULT_LOOP_COUNT;
	while (--loop_count && isp_inw(host, HOST_HCCR) == RISC_BUSY)
		barrier();
	if (!loop_count)
		printk("qlogicisp: reset_hardware loop timeout\n");

	isp_outw(0, host, ISP_CFG1);

#if DEBUG_ISP1020
	printk("qlogicisp : mbox 0 0x%04x \n", isp_inw(host, MBOX0));
	printk("qlogicisp : mbox 1 0x%04x \n", isp_inw(host, MBOX1));
	printk("qlogicisp : mbox 2 0x%04x \n", isp_inw(host, MBOX2));
	printk("qlogicisp : mbox 3 0x%04x \n", isp_inw(host, MBOX3));
	printk("qlogicisp : mbox 4 0x%04x \n", isp_inw(host, MBOX4));
	printk("qlogicisp : mbox 5 0x%04x \n", isp_inw(host, MBOX5));
#endif /* DEBUG_ISP1020 */

	param[0] = MBOX_NO_OP;
	isp1020_mbox_command(host, param);
	if (param[0] != MBOX_COMMAND_COMPLETE) {
		printk("qlogicisp : NOP test failed\n");
		return 1;
	}

	DEBUG(printk("qlogicisp : loading risc ram\n"));

#if RELOAD_FIRMWARE
	for (loop_count = 0; loop_count < risc_code_length01; loop_count++) {
		param[0] = MBOX_WRITE_RAM_WORD;
		param[1] = risc_code_addr01 + loop_count;
		param[2] = risc_code01[loop_count];
		isp1020_mbox_command(host, param);
		if (param[0] != MBOX_COMMAND_COMPLETE) {
			printk("qlogicisp : firmware load failure at %d\n",
			    loop_count);
			return 1;
		}
	}
#endif /* RELOAD_FIRMWARE */

	DEBUG(printk("qlogicisp : verifying checksum\n"));

	param[0] = MBOX_VERIFY_CHECKSUM;
	param[1] = risc_code_addr01;

	isp1020_mbox_command(host, param);

	if (param[0] != MBOX_COMMAND_COMPLETE) {
		printk("qlogicisp : ram checksum failure\n");
		return 1;
	}

	DEBUG(printk("qlogicisp : executing firmware\n"));

	param[0] = MBOX_EXEC_FIRMWARE;
	param[1] = risc_code_addr01;

	isp1020_mbox_command(host, param);

	param[0] = MBOX_ABOUT_FIRMWARE;

	isp1020_mbox_command(host, param);

	if (param[0] != MBOX_COMMAND_COMPLETE) {
		printk("qlogicisp : about firmware failure\n");
		return 1;
	}

	DEBUG(printk("qlogicisp : firmware major revision %d\n", param[1]));
	DEBUG(printk("qlogicisp : firmware minor revision %d\n", param[2]));

	LEAVE("isp1020_reset_hardware");

	return 0;
}


static int isp1020_init(struct Scsi_Host *sh)
{
	u_long io_base, mem_base, io_flags, mem_flags;
	struct isp1020_hostdata *hostdata;
	u_char revision;
	u_int irq;
	u_short command;
	struct pci_dev *pdev;

	ENTER("isp1020_init");

	hostdata = (struct isp1020_hostdata *) sh->hostdata;
	pdev = hostdata->pci_dev;

	if (pci_read_config_word(pdev, PCI_COMMAND, &command)
	    || pci_read_config_byte(pdev, PCI_CLASS_REVISION, &revision))
	{
		printk("qlogicisp : error reading PCI configuration\n");
		return 1;
	}

	io_base = pci_resource_start(pdev, 0);
	mem_base = pci_resource_start(pdev, 1);
	io_flags = pci_resource_flags(pdev, 0);
	mem_flags = pci_resource_flags(pdev, 1);
	irq = pdev->irq;

	if (pdev->vendor != PCI_VENDOR_ID_QLOGIC) {
		printk("qlogicisp : 0x%04x is not QLogic vendor ID\n",
		       pdev->vendor);
		return 1;
	}

	if (pdev->device != PCI_DEVICE_ID_QLOGIC_ISP1020) {
		printk("qlogicisp : 0x%04x does not match ISP1020 device id\n",
		       pdev->device);
		return 1;
	}

#ifdef __alpha__
	/* Force ALPHA to use bus I/O and not bus MEM.
	   This is to avoid having to use HAE_MEM registers,
	   which is broken on some platforms and with SMP.  */
	command &= ~PCI_COMMAND_MEMORY; 
#endif

	if (!(command & PCI_COMMAND_MASTER)) {
		printk("qlogicisp : bus mastering is disabled\n");
		return 1;
	}

	sh->io_port = io_base;

	if (check_region(sh->io_port, 0xff)) {
		printk("qlogicisp : i/o region 0x%lx-0x%lx already "
		       "in use\n",
		       sh->io_port, sh->io_port + 0xff);
		return 1;
	}

	request_region(sh->io_port, 0xff, "qlogicisp");

 	if ((command & PCI_COMMAND_MEMORY) &&
 	    ((mem_flags & 1) == 0)) {
 		mem_base = (u_long) ioremap(mem_base, PAGE_SIZE);
 		hostdata->memaddr = mem_base;
 	} else {
 		if (command & PCI_COMMAND_IO && (io_flags & 3) != 1)
 		{
 			printk("qlogicisp : i/o mapping is disabled\n");
			release_region(sh->io_port, 0xff);
 			return 1;
 		}
 		hostdata->memaddr = 0; /* zero to signify no i/o mapping */
 		mem_base = 0;
	}

	if (revision != ISP1020_REV_ID)
		printk("qlogicisp : new isp1020 revision ID (%d)\n", revision);

	if (isp_inw(sh,  PCI_ID_LOW) != PCI_VENDOR_ID_QLOGIC
	    || isp_inw(sh, PCI_ID_HIGH) != PCI_DEVICE_ID_QLOGIC_ISP1020)
	{
		printk("qlogicisp : can't decode %s address space 0x%lx\n",
		       (io_base ? "I/O" : "MEM"),
		       (io_base ? io_base : mem_base));
		iounmap((void *)hostdata->memaddr);
		release_region(sh->io_port, 0xff);
		return 1;
	}

	hostdata->revision = revision;

	sh->irq = irq;
	sh->max_id = MAX_TARGETS;
	sh->max_lun = MAX_LUNS;

	hostdata->res_cpu = pci_alloc_consistent(hostdata->pci_dev,
						 QSIZE(RES_QUEUE_LEN),
						 &hostdata->res_dma);
	if (hostdata->res_cpu == NULL) {
		printk("qlogicisp : can't allocate response queue\n");
		return 1;
	}

	hostdata->req_cpu = pci_alloc_consistent(hostdata->pci_dev,
						 QSIZE(QLOGICISP_REQ_QUEUE_LEN),
						 &hostdata->req_dma);
	if (hostdata->req_cpu == NULL) {
		pci_free_consistent(hostdata->pci_dev,
				    QSIZE(RES_QUEUE_LEN),
				    hostdata->res_cpu,
				    hostdata->res_dma);
		printk("qlogicisp : can't allocate request queue\n");
		return 1;
	}

	LEAVE("isp1020_init");

	return 0;
}


#if USE_NVRAM_DEFAULTS

static int isp1020_get_defaults(struct Scsi_Host *host)
{
	int i;
	u_short value;
	struct isp1020_hostdata *hostdata =
		(struct isp1020_hostdata *) host->hostdata;

	ENTER("isp1020_get_defaults");

	if (!isp1020_verify_nvram(host)) {
		printk("qlogicisp : nvram checksum failure\n");
		printk("qlogicisp : attempting to use default parameters\n");
		return isp1020_set_defaults(host);
	}

	value = isp1020_read_nvram_word(host, 2);
	hostdata->host_param.fifo_threshold = (value >> 8) & 0x03;