sbp2.c

这个是uClinux下的ieee1394驱动

static int sbp2_login_device(struct sbp2scsi_host_info *hi, struct scsi_id_instance_data *scsi_id) 
{
	quadlet_t data[2];

	SBP2_DEBUG("sbp2_login_device");

	if (!scsi_id->login_orb) {
		SBP2_DEBUG("sbp2_login_device: login_orb not alloc'd!");
		return(-EIO);
	}

	/* Set-up login ORB, assume no password */
	scsi_id->login_orb->password_hi = 0; 
	scsi_id->login_orb->password_lo = 0;
	SBP2_DEBUG("sbp2_login_device: password_hi/lo initialized");

	scsi_id->login_orb->login_response_lo = scsi_id->login_response_dma;
	scsi_id->login_orb->login_response_hi = ORB_SET_NODE_ID(hi->host->node_id);
	SBP2_DEBUG("sbp2_login_device: login_response_hi/lo initialized");

	scsi_id->login_orb->lun_misc = ORB_SET_FUNCTION(LOGIN_REQUEST);
	scsi_id->login_orb->lun_misc |= ORB_SET_RECONNECT(0);	/* One second reconnect time */
	scsi_id->login_orb->lun_misc |= ORB_SET_EXCLUSIVE(sbp2_exclusive_login);	/* Exclusive access to device */
	scsi_id->login_orb->lun_misc |= ORB_SET_NOTIFY(1);	/* Notify us of login complete */
	/* Set the lun if we were able to pull it from the device's unit directory */
	if (scsi_id->sbp2_device_type_and_lun != SBP2_DEVICE_TYPE_LUN_UNINITIALIZED) {
		scsi_id->login_orb->lun_misc |= ORB_SET_LUN(scsi_id->sbp2_device_type_and_lun);
	}
	SBP2_DEBUG("sbp2_login_device: lun_misc initialized");

	scsi_id->login_orb->passwd_resp_lengths =
		ORB_SET_LOGIN_RESP_LENGTH(sizeof(struct sbp2_login_response));
	SBP2_DEBUG("sbp2_login_device: passwd_resp_lengths initialized");

	scsi_id->login_orb->status_FIFO_lo = SBP2_STATUS_FIFO_ADDRESS_LO + 
					     SBP2_STATUS_FIFO_ENTRY_TO_OFFSET(scsi_id->id);
	scsi_id->login_orb->status_FIFO_hi = (ORB_SET_NODE_ID(hi->host->node_id) |
					      SBP2_STATUS_FIFO_ADDRESS_HI);
	SBP2_DEBUG("sbp2_login_device: status FIFO initialized");

	/*
	 * Byte swap ORB if necessary
	 */
	sbp2util_cpu_to_be32_buffer(scsi_id->login_orb, sizeof(struct sbp2_login_orb));

	SBP2_DEBUG("sbp2_login_device: orb byte-swapped");

	sbp2util_packet_dump(scsi_id->login_orb, sizeof(struct sbp2_login_orb), 
			     "sbp2 login orb", scsi_id->login_orb_dma);

	/*
	 * Initialize login response and status fifo
	 */
	memset(scsi_id->login_response, 0, sizeof(struct sbp2_login_response));
	memset(&scsi_id->status_block, 0, sizeof(struct sbp2_status_block));

	SBP2_DEBUG("sbp2_login_device: login_response/status FIFO memset");

	/*
	 * Ok, let's write to the target's management agent register
	 */
	data[0] = ORB_SET_NODE_ID(hi->host->node_id);
	data[1] = scsi_id->login_orb_dma;
	sbp2util_cpu_to_be32_buffer(data, 8);

	atomic_set(&scsi_id->sbp2_login_complete, 0);

	SBP2_DEBUG("sbp2_login_device: prepared to write");
	hpsb_node_write(scsi_id->ne, scsi_id->sbp2_management_agent_addr, data, 8);
	SBP2_DEBUG("sbp2_login_device: written");

	/*
	 * Wait for login status (up to 20 seconds)... 
	 */
	if (sbp2util_down_timeout(&scsi_id->sbp2_login_complete, 20*HZ)) {
		SBP2_ERR("Error logging into SBP-2 device - login timed-out");
		return(-EIO);
	}

	/*
	 * Sanity. Make sure status returned matches login orb.
	 */
	if (scsi_id->status_block.ORB_offset_lo != scsi_id->login_orb_dma) {
		SBP2_ERR("Error logging into SBP-2 device - login timed-out");
		return(-EIO);
	}

	/*
	 * Check status
	 */
	if (STATUS_GET_RESP(scsi_id->status_block.ORB_offset_hi_misc) ||
	    STATUS_GET_DEAD_BIT(scsi_id->status_block.ORB_offset_hi_misc) ||
	    STATUS_GET_SBP_STATUS(scsi_id->status_block.ORB_offset_hi_misc)) {

		SBP2_ERR("Error logging into SBP-2 device - login failed");
		return(-EIO);
	}

	/*
	 * Byte swap the login response, for use when reconnecting or
	 * logging out.
	 */
	sbp2util_cpu_to_be32_buffer(scsi_id->login_response, sizeof(struct sbp2_login_response));

	/*
	 * Grab our command block agent address from the login response.
	 */
	SBP2_DEBUG("command_block_agent_hi = %x",
		   (unsigned int)scsi_id->login_response->command_block_agent_hi);
	SBP2_DEBUG("command_block_agent_lo = %x",
		   (unsigned int)scsi_id->login_response->command_block_agent_lo);

	scsi_id->sbp2_command_block_agent_addr =
		((u64)scsi_id->login_response->command_block_agent_hi) << 32;
	scsi_id->sbp2_command_block_agent_addr |= ((u64)scsi_id->login_response->command_block_agent_lo);
	scsi_id->sbp2_command_block_agent_addr &= 0x0000ffffffffffffULL;

	SBP2_INFO("Logged into SBP-2 device");

	return(0);

}

/*
 * This function is called in order to logout from a particular SBP-2
 * device, usually called during driver unload.
 */
static int sbp2_logout_device(struct sbp2scsi_host_info *hi, struct scsi_id_instance_data *scsi_id) 
{
	quadlet_t data[2];

	SBP2_DEBUG("sbp2_logout_device");

	/*
	 * Set-up logout ORB
	 */
	scsi_id->logout_orb->reserved1 = 0x0;
	scsi_id->logout_orb->reserved2 = 0x0;
	scsi_id->logout_orb->reserved3 = 0x0;
	scsi_id->logout_orb->reserved4 = 0x0;

	scsi_id->logout_orb->login_ID_misc = ORB_SET_FUNCTION(LOGOUT_REQUEST);
	scsi_id->logout_orb->login_ID_misc |= ORB_SET_LOGIN_ID(scsi_id->login_response->length_login_ID);

	/* Notify us when complete */
	scsi_id->logout_orb->login_ID_misc |= ORB_SET_NOTIFY(1);

	scsi_id->logout_orb->reserved5 = 0x0;
	scsi_id->logout_orb->status_FIFO_lo = SBP2_STATUS_FIFO_ADDRESS_LO + 
					      SBP2_STATUS_FIFO_ENTRY_TO_OFFSET(scsi_id->id);
	scsi_id->logout_orb->status_FIFO_hi = (ORB_SET_NODE_ID(hi->host->node_id) |
					       SBP2_STATUS_FIFO_ADDRESS_HI);

	/*
	 * Byte swap ORB if necessary
	 */
	sbp2util_cpu_to_be32_buffer(scsi_id->logout_orb, sizeof(struct sbp2_logout_orb));

	sbp2util_packet_dump(scsi_id->logout_orb, sizeof(struct sbp2_logout_orb), 
			     "sbp2 logout orb", scsi_id->logout_orb_dma);

	/*
	 * Ok, let's write to the target's management agent register
	 */
	data[0] = ORB_SET_NODE_ID(hi->host->node_id);
	data[1] = scsi_id->logout_orb_dma;
	sbp2util_cpu_to_be32_buffer(data, 8);

	atomic_set(&scsi_id->sbp2_login_complete, 0);

	hpsb_node_write(scsi_id->ne, scsi_id->sbp2_management_agent_addr, data, 8);

	/* Wait for device to logout...1 second. */
	sbp2util_down_timeout(&scsi_id->sbp2_login_complete, HZ);

	SBP2_INFO("Logged out of SBP-2 device");

	return(0);

}

/*
 * This function is called in order to reconnect to a particular SBP-2
 * device, after a bus reset.
 */
static int sbp2_reconnect_device(struct sbp2scsi_host_info *hi, struct scsi_id_instance_data *scsi_id) 
{
	quadlet_t data[2];

	SBP2_DEBUG("sbp2_reconnect_device");

	/*
	 * Set-up reconnect ORB
	 */
	scsi_id->reconnect_orb->reserved1 = 0x0;
	scsi_id->reconnect_orb->reserved2 = 0x0;
	scsi_id->reconnect_orb->reserved3 = 0x0;
	scsi_id->reconnect_orb->reserved4 = 0x0;

	scsi_id->reconnect_orb->login_ID_misc = ORB_SET_FUNCTION(RECONNECT_REQUEST);
	scsi_id->reconnect_orb->login_ID_misc |=
		ORB_SET_LOGIN_ID(scsi_id->login_response->length_login_ID);

	/* Notify us when complete */
	scsi_id->reconnect_orb->login_ID_misc |= ORB_SET_NOTIFY(1);

	scsi_id->reconnect_orb->reserved5 = 0x0;
	scsi_id->reconnect_orb->status_FIFO_lo = SBP2_STATUS_FIFO_ADDRESS_LO + 
						 SBP2_STATUS_FIFO_ENTRY_TO_OFFSET(scsi_id->id);
	scsi_id->reconnect_orb->status_FIFO_hi =
		(ORB_SET_NODE_ID(hi->host->node_id) | SBP2_STATUS_FIFO_ADDRESS_HI);

	/*
	 * Byte swap ORB if necessary
	 */
	sbp2util_cpu_to_be32_buffer(scsi_id->reconnect_orb, sizeof(struct sbp2_reconnect_orb));

	sbp2util_packet_dump(scsi_id->reconnect_orb, sizeof(struct sbp2_reconnect_orb), 
			     "sbp2 reconnect orb", scsi_id->reconnect_orb_dma);

	/*
	 * Initialize status fifo
	 */
	memset(&scsi_id->status_block, 0, sizeof(struct sbp2_status_block));

	/*
	 * Ok, let's write to the target's management agent register
	 */
	data[0] = ORB_SET_NODE_ID(hi->host->node_id);
	data[1] = scsi_id->reconnect_orb_dma;
	sbp2util_cpu_to_be32_buffer(data, 8);

	atomic_set(&scsi_id->sbp2_login_complete, 0);

	hpsb_node_write(scsi_id->ne, scsi_id->sbp2_management_agent_addr, data, 8);

	/*
	 * Wait for reconnect status (up to 1 second)...
	 */
	if (sbp2util_down_timeout(&scsi_id->sbp2_login_complete, HZ)) {
		SBP2_ERR("Error reconnecting to SBP-2 device - reconnect timed-out");
		return(-EIO);
	}

	/*
	 * Sanity. Make sure status returned matches reconnect orb.
	 */
	if (scsi_id->status_block.ORB_offset_lo != scsi_id->reconnect_orb_dma) {
		SBP2_ERR("Error reconnecting to SBP-2 device - reconnect timed-out");
		return(-EIO);
	}

	/*
	 * Check status
	 */
	if (STATUS_GET_RESP(scsi_id->status_block.ORB_offset_hi_misc) ||
	    STATUS_GET_DEAD_BIT(scsi_id->status_block.ORB_offset_hi_misc) ||
	    STATUS_GET_SBP_STATUS(scsi_id->status_block.ORB_offset_hi_misc)) {

		SBP2_ERR("Error reconnecting to SBP-2 device - reconnect failed");
		return(-EIO);
	}

	SBP2_INFO("Reconnected to SBP-2 device");

	return(0);

}

/*
 * This function is called in order to set the busy timeout (number of
 * retries to attempt) on the sbp2 device. 
 */
static int sbp2_set_busy_timeout(struct sbp2scsi_host_info *hi, struct scsi_id_instance_data *scsi_id)
{      
	quadlet_t data;

	SBP2_DEBUG("sbp2_set_busy_timeout");

	/*
	 * Ok, let's write to the target's busy timeout register
	 */
	data = cpu_to_be32(SBP2_BUSY_TIMEOUT_VALUE);

	if (hpsb_node_write(scsi_id->ne, SBP2_BUSY_TIMEOUT_ADDRESS, &data, 4)) {
		SBP2_ERR("sbp2_set_busy_timeout error");
	}

	return(0);
}

/*
 * This function is called to parse sbp2 device's config rom unit
 * directory. Used to determine things like sbp2 management agent offset,
 * and command set used (SCSI or RBC). 
 */
static void sbp2_parse_unit_directory(struct scsi_id_instance_data *scsi_id)
{
	struct unit_directory *ud;
	int i;

	SBP2_DEBUG("sbp2_parse_unit_directory");

	/* Initialize some fields, in case an entry does not exist */
	scsi_id->sbp2_device_type_and_lun = SBP2_DEVICE_TYPE_LUN_UNINITIALIZED;
	scsi_id->sbp2_management_agent_addr = 0x0;
	scsi_id->sbp2_command_set_spec_id = 0x0;
	scsi_id->sbp2_command_set = 0x0;
	scsi_id->sbp2_unit_characteristics = 0x0;
	scsi_id->sbp2_firmware_revision = 0x0;

	ud = scsi_id->ud;

	/* Handle different fields in the unit directory, based on keys */
	for (i = 0; i < ud->count; i++) {
		switch (CONFIG_ROM_KEY(ud->quadlets[i])) {
		case SBP2_CSR_OFFSET_KEY:
			/* Save off the management agent address */
			scsi_id->sbp2_management_agent_addr =
				CSR_REGISTER_BASE + 
				(CONFIG_ROM_VALUE(ud->quadlets[i]) << 2);

			SBP2_DEBUG("sbp2_management_agent_addr = %x",
				   (unsigned int) scsi_id->sbp2_management_agent_addr);
			break;

		case SBP2_COMMAND_SET_SPEC_ID_KEY:
			/* Command spec organization */
			scsi_id->sbp2_command_set_spec_id
				= CONFIG_ROM_VALUE(ud->quadlets[i]);
			SBP2_DEBUG("sbp2_command_set_spec_id = %x",
				   (unsigned int) scsi_id->sbp2_command_set_spec_id);
			break;

		case SBP2_COMMAND_SET_KEY:
			/* Command set used by sbp2 device */
			scsi_id->sbp2_command_set
				= CONFIG_ROM_VALUE(ud->quadlets[i]);
			SBP2_DEBUG("sbp2_command_set = %x",
				   (unsigned int) scsi_id->sbp2_command_set);
			break;

		case SBP2_UNIT_CHARACTERISTICS_KEY:
			/*
			 * Unit characterisitcs (orb related stuff
			 * that I'm not yet paying attention to)
			 */
			scsi_id->sbp2_unit_characteristics
				= CONFIG_ROM_VALUE(ud->quadlets[i]);
			SBP2_DEBUG("sbp2_unit_characteristics = %x",
				   (unsigned int) scsi_id->sbp2_unit_characteristics);
			break;

		case SBP2_DEVICE_TYPE_AND_LUN_KEY:
			/*
			 * Device type and lun (used for
			 * detemining type of sbp2 device)
			 */
			scsi_id->sbp2_device_type_and_lun
				= CONFIG_ROM_VALUE(ud->quadlets[i]);
			SBP2_DEBUG("sbp2_device_type_and_lun = %x",
				   (unsigned int) scsi_id->sbp2_device_type_and_lun);
			break;

		case SBP2_FIRMWARE_REVISION_KEY:
			/* Firmware revision */
			scsi_id->sbp2_firmware_revision
				= CONFIG_ROM_VALUE(ud->quadlets[i]);
			if (sbp2_force_inquiry_hack)
				SBP2_INFO("sbp2_firmware_revision = %x",
				   (unsigned int) scsi_id->sbp2_firmware_revision);
			else	SBP2_DEBUG("sbp2_firmware_revision = %x",
				   (unsigned int) scsi_id->sbp2_firmware_revision);
			break;

		default:
			break;
		}
	}

	/* This is the start of our broken device checking. We try to hack
	 * around oddities and known defects.  */
	scsi_id->workarounds = 0x0;

	/* If the vendor id is 0xa0b8 (Symbios vendor id), then we have a
	 * bridge with 128KB max transfer size limitation. For sanity, we
	 * only voice this when the current sbp2_max_sectors setting
	 * ex