Initial import

1 files changed, 1812 insertions, 0 deletions

diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
new file mode 100644
index 000000000..98a62bc15
--- /dev/null
+++ b/drivers/scsi/stex.c
@@ -0,0 +1,1812 @@
+/*
+ * SuperTrak EX Series Storage Controller driver for Linux
+ *
+ *	Copyright (C) 2005-2009 Promise Technology Inc.
+ *
+ *	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.
+ *
+ *	Written By:
+ *		Ed Lin <promise_linux@promise.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/byteorder.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_eh.h>
+
+#define DRV_NAME "stex"
+#define ST_DRIVER_VERSION "4.6.0000.4"
+#define ST_VER_MAJOR		4
+#define ST_VER_MINOR		6
+#define ST_OEM			0
+#define ST_BUILD_VER		4
+
+enum {
+	/* MU register offset */
+	IMR0	= 0x10,	/* MU_INBOUND_MESSAGE_REG0 */
+	IMR1	= 0x14,	/* MU_INBOUND_MESSAGE_REG1 */
+	OMR0	= 0x18,	/* MU_OUTBOUND_MESSAGE_REG0 */
+	OMR1	= 0x1c,	/* MU_OUTBOUND_MESSAGE_REG1 */
+	IDBL	= 0x20,	/* MU_INBOUND_DOORBELL */
+	IIS	= 0x24,	/* MU_INBOUND_INTERRUPT_STATUS */
+	IIM	= 0x28,	/* MU_INBOUND_INTERRUPT_MASK */
+	ODBL	= 0x2c,	/* MU_OUTBOUND_DOORBELL */
+	OIS	= 0x30,	/* MU_OUTBOUND_INTERRUPT_STATUS */
+	OIM	= 0x3c,	/* MU_OUTBOUND_INTERRUPT_MASK */
+
+	YIOA_STATUS				= 0x00,
+	YH2I_INT				= 0x20,
+	YINT_EN					= 0x34,
+	YI2H_INT				= 0x9c,
+	YI2H_INT_C				= 0xa0,
+	YH2I_REQ				= 0xc0,
+	YH2I_REQ_HI				= 0xc4,
+
+	/* MU register value */
+	MU_INBOUND_DOORBELL_HANDSHAKE		= (1 << 0),
+	MU_INBOUND_DOORBELL_REQHEADCHANGED	= (1 << 1),
+	MU_INBOUND_DOORBELL_STATUSTAILCHANGED	= (1 << 2),
+	MU_INBOUND_DOORBELL_HMUSTOPPED		= (1 << 3),
+	MU_INBOUND_DOORBELL_RESET		= (1 << 4),
+
+	MU_OUTBOUND_DOORBELL_HANDSHAKE		= (1 << 0),
+	MU_OUTBOUND_DOORBELL_REQUESTTAILCHANGED	= (1 << 1),
+	MU_OUTBOUND_DOORBELL_STATUSHEADCHANGED	= (1 << 2),
+	MU_OUTBOUND_DOORBELL_BUSCHANGE		= (1 << 3),
+	MU_OUTBOUND_DOORBELL_HASEVENT		= (1 << 4),
+	MU_OUTBOUND_DOORBELL_REQUEST_RESET	= (1 << 27),
+
+	/* MU status code */
+	MU_STATE_STARTING			= 1,
+	MU_STATE_STARTED			= 2,
+	MU_STATE_RESETTING			= 3,
+	MU_STATE_FAILED				= 4,
+
+	MU_MAX_DELAY				= 120,
+	MU_HANDSHAKE_SIGNATURE			= 0x55aaaa55,
+	MU_HANDSHAKE_SIGNATURE_HALF		= 0x5a5a0000,
+	MU_HARD_RESET_WAIT			= 30000,
+	HMU_PARTNER_TYPE			= 2,
+
+	/* firmware returned values */
+	SRB_STATUS_SUCCESS			= 0x01,
+	SRB_STATUS_ERROR			= 0x04,
+	SRB_STATUS_BUSY				= 0x05,
+	SRB_STATUS_INVALID_REQUEST		= 0x06,
+	SRB_STATUS_SELECTION_TIMEOUT		= 0x0A,
+	SRB_SEE_SENSE 				= 0x80,
+
+	/* task attribute */
+	TASK_ATTRIBUTE_SIMPLE			= 0x0,
+	TASK_ATTRIBUTE_HEADOFQUEUE		= 0x1,
+	TASK_ATTRIBUTE_ORDERED			= 0x2,
+	TASK_ATTRIBUTE_ACA			= 0x4,
+
+	SS_STS_NORMAL				= 0x80000000,
+	SS_STS_DONE				= 0x40000000,
+	SS_STS_HANDSHAKE			= 0x20000000,
+
+	SS_HEAD_HANDSHAKE			= 0x80,
+
+	SS_H2I_INT_RESET			= 0x100,
+
+	SS_I2H_REQUEST_RESET			= 0x2000,
+
+	SS_MU_OPERATIONAL			= 0x80000000,
+
+	STEX_CDB_LENGTH				= 16,
+	STATUS_VAR_LEN				= 128,
+
+	/* sg flags */
+	SG_CF_EOT				= 0x80,	/* end of table */
+	SG_CF_64B				= 0x40,	/* 64 bit item */
+	SG_CF_HOST				= 0x20,	/* sg in host memory */
+	MSG_DATA_DIR_ND				= 0,
+	MSG_DATA_DIR_IN				= 1,
+	MSG_DATA_DIR_OUT			= 2,
+
+	st_shasta				= 0,
+	st_vsc					= 1,
+	st_yosemite				= 2,
+	st_seq					= 3,
+	st_yel					= 4,
+
+	PASSTHRU_REQ_TYPE			= 0x00000001,
+	PASSTHRU_REQ_NO_WAKEUP			= 0x00000100,
+	ST_INTERNAL_TIMEOUT			= 180,
+
+	ST_TO_CMD				= 0,
+	ST_FROM_CMD				= 1,
+
+	/* vendor specific commands of Promise */
+	MGT_CMD					= 0xd8,
+	SINBAND_MGT_CMD				= 0xd9,
+	ARRAY_CMD				= 0xe0,
+	CONTROLLER_CMD				= 0xe1,
+	DEBUGGING_CMD				= 0xe2,
+	PASSTHRU_CMD				= 0xe3,
+
+	PASSTHRU_GET_ADAPTER			= 0x05,
+	PASSTHRU_GET_DRVVER			= 0x10,
+
+	CTLR_CONFIG_CMD				= 0x03,
+	CTLR_SHUTDOWN				= 0x0d,
+
+	CTLR_POWER_STATE_CHANGE			= 0x0e,
+	CTLR_POWER_SAVING			= 0x01,
+
+	PASSTHRU_SIGNATURE			= 0x4e415041,
+	MGT_CMD_SIGNATURE			= 0xba,
+
+	INQUIRY_EVPD				= 0x01,
+
+	ST_ADDITIONAL_MEM			= 0x200000,
+	ST_ADDITIONAL_MEM_MIN			= 0x80000,
+};
+
+struct st_sgitem {
+	u8 ctrl;	/* SG_CF_xxx */
+	u8 reserved[3];
+	__le32 count;
+	__le64 addr;
+};
+
+struct st_ss_sgitem {
+	__le32 addr;
+	__le32 addr_hi;
+	__le32 count;
+};
+
+struct st_sgtable {
+	__le16 sg_count;
+	__le16 max_sg_count;
+	__le32 sz_in_byte;
+};
+
+struct st_msg_header {
+	__le64 handle;
+	u8 flag;
+	u8 channel;
+	__le16 timeout;
+	u32 reserved;
+};
+
+struct handshake_frame {
+	__le64 rb_phy;		/* request payload queue physical address */
+	__le16 req_sz;		/* size of each request payload */
+	__le16 req_cnt;		/* count of reqs the buffer can hold */
+	__le16 status_sz;	/* size of each status payload */
+	__le16 status_cnt;	/* count of status the buffer can hold */
+	__le64 hosttime;	/* seconds from Jan 1, 1970 (GMT) */
+	u8 partner_type;	/* who sends this frame */
+	u8 reserved0[7];
+	__le32 partner_ver_major;
+	__le32 partner_ver_minor;
+	__le32 partner_ver_oem;
+	__le32 partner_ver_build;
+	__le32 extra_offset;	/* NEW */
+	__le32 extra_size;	/* NEW */
+	__le32 scratch_size;
+	u32 reserved1;
+};
+
+struct req_msg {
+	__le16 tag;
+	u8 lun;
+	u8 target;
+	u8 task_attr;
+	u8 task_manage;
+	u8 data_dir;
+	u8 payload_sz;		/* payload size in 4-byte, not used */
+	u8 cdb[STEX_CDB_LENGTH];
+	u32 variable[0];
+};
+
+struct status_msg {
+	__le16 tag;
+	u8 lun;
+	u8 target;
+	u8 srb_status;
+	u8 scsi_status;
+	u8 reserved;
+	u8 payload_sz;		/* payload size in 4-byte */
+	u8 variable[STATUS_VAR_LEN];
+};
+
+struct ver_info {
+	u32 major;
+	u32 minor;
+	u32 oem;
+	u32 build;
+	u32 reserved[2];
+};
+
+struct st_frame {
+	u32 base[6];
+	u32 rom_addr;
+
+	struct ver_info drv_ver;
+	struct ver_info bios_ver;
+
+	u32 bus;
+	u32 slot;
+	u32 irq_level;
+	u32 irq_vec;
+	u32 id;
+	u32 subid;
+
+	u32 dimm_size;
+	u8 dimm_type;
+	u8 reserved[3];
+
+	u32 channel;
+	u32 reserved1;
+};
+
+struct st_drvver {
+	u32 major;
+	u32 minor;
+	u32 oem;
+	u32 build;
+	u32 signature[2];
+	u8 console_id;
+	u8 host_no;
+	u8 reserved0[2];
+	u32 reserved[3];
+};
+
+struct st_ccb {
+	struct req_msg *req;
+	struct scsi_cmnd *cmd;
+
+	void *sense_buffer;
+	unsigned int sense_bufflen;
+	int sg_count;
+
+	u32 req_type;
+	u8 srb_status;
+	u8 scsi_status;
+	u8 reserved[2];
+};
+
+struct st_hba {
+	void __iomem *mmio_base;	/* iomapped PCI memory space */
+	void *dma_mem;
+	dma_addr_t dma_handle;
+	size_t dma_size;
+
+	struct Scsi_Host *host;
+	struct pci_dev *pdev;
+
+	struct req_msg * (*alloc_rq) (struct st_hba *);
+	int (*map_sg)(struct st_hba *, struct req_msg *, struct st_ccb *);
+	void (*send) (struct st_hba *, struct req_msg *, u16);
+
+	u32 req_head;
+	u32 req_tail;
+	u32 status_head;
+	u32 status_tail;
+
+	struct status_msg *status_buffer;
+	void *copy_buffer; /* temp buffer for driver-handled commands */
+	struct st_ccb *ccb;
+	struct st_ccb *wait_ccb;
+	__le32 *scratch;
+
+	char work_q_name[20];
+	struct workqueue_struct *work_q;
+	struct work_struct reset_work;
+	wait_queue_head_t reset_waitq;
+	unsigned int mu_status;
+	unsigned int cardtype;
+	int msi_enabled;
+	int out_req_cnt;
+	u32 extra_offset;
+	u16 rq_count;
+	u16 rq_size;
+	u16 sts_count;
+};
+
+struct st_card_info {
+	struct req_msg * (*alloc_rq) (struct st_hba *);
+	int (*map_sg)(struct st_hba *, struct req_msg *, struct st_ccb *);
+	void (*send) (struct st_hba *, struct req_msg *, u16);
+	unsigned int max_id;
+	unsigned int max_lun;
+	unsigned int max_channel;
+	u16 rq_count;
+	u16 rq_size;
+	u16 sts_count;
+};
+
+static int msi;
+module_param(msi, int, 0);
+MODULE_PARM_DESC(msi, "Enable Message Signaled Interrupts(0=off, 1=on)");
+
+static const char console_inq_page[] =
+{
+	0x03,0x00,0x03,0x03,0xFA,0x00,0x00,0x30,
+	0x50,0x72,0x6F,0x6D,0x69,0x73,0x65,0x20,	/* "Promise " */
+	0x52,0x41,0x49,0x44,0x20,0x43,0x6F,0x6E,	/* "RAID Con" */
+	0x73,0x6F,0x6C,0x65,0x20,0x20,0x20,0x20,	/* "sole    " */
+	0x31,0x2E,0x30,0x30,0x20,0x20,0x20,0x20,	/* "1.00    " */
+	0x53,0x58,0x2F,0x52,0x53,0x41,0x46,0x2D,	/* "SX/RSAF-" */
+	0x54,0x45,0x31,0x2E,0x30,0x30,0x20,0x20,	/* "TE1.00  " */
+	0x0C,0x20,0x20,0x20,0x20,0x20,0x20,0x20
+};
+
+MODULE_AUTHOR("Ed Lin");
+MODULE_DESCRIPTION("Promise Technology SuperTrak EX Controllers");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(ST_DRIVER_VERSION);
+
+static void stex_gettime(__le64 *time)
+{
+	struct timeval tv;
+
+	do_gettimeofday(&tv);
+	*time = cpu_to_le64(tv.tv_sec);
+}
+
+static struct status_msg *stex_get_status(struct st_hba *hba)
+{
+	struct status_msg *status = hba->status_buffer + hba->status_tail;
+
+	++hba->status_tail;
+	hba->status_tail %= hba->sts_count+1;
+
+	return status;
+}
+
+static void stex_invalid_field(struct scsi_cmnd *cmd,
+			       void (*done)(struct scsi_cmnd *))
+{
+	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+	/* "Invalid field in cdb" */
+	scsi_build_sense_buffer(0, cmd->sense_buffer, ILLEGAL_REQUEST, 0x24,
+				0x0);
+	done(cmd);
+}
+
+static struct req_msg *stex_alloc_req(struct st_hba *hba)
+{
+	struct req_msg *req = hba->dma_mem + hba->req_head * hba->rq_size;
+
+	++hba->req_head;
+	hba->req_head %= hba->rq_count+1;
+
+	return req;
+}
+
+static struct req_msg *stex_ss_alloc_req(struct st_hba *hba)
+{
+	return (struct req_msg *)(hba->dma_mem +
+		hba->req_head * hba->rq_size + sizeof(struct st_msg_header));
+}
+
+static int stex_map_sg(struct st_hba *hba,
+	struct req_msg *req, struct st_ccb *ccb)
+{
+	struct scsi_cmnd *cmd;
+	struct scatterlist *sg;
+	struct st_sgtable *dst;
+	struct st_sgitem *table;
+	int i, nseg;
+
+	cmd = ccb->cmd;
+	nseg = scsi_dma_map(cmd);
+	BUG_ON(nseg < 0);
+	if (nseg) {
+		dst = (struct st_sgtable *)req->variable;
+
+		ccb->sg_count = nseg;
+		dst->sg_count = cpu_to_le16((u16)nseg);
+		dst->max_sg_count = cpu_to_le16(hba->host->sg_tablesize);
+		dst->sz_in_byte = cpu_to_le32(scsi_bufflen(cmd));
+
+		table = (struct st_sgitem *)(dst + 1);
+		scsi_for_each_sg(cmd, sg, nseg, i) {
+			table[i].count = cpu_to_le32((u32)sg_dma_len(sg));
+			table[i].addr = cpu_to_le64(sg_dma_address(sg));
+			table[i].ctrl = SG_CF_64B | SG_CF_HOST;
+		}
+		table[--i].ctrl |= SG_CF_EOT;
+	}
+
+	return nseg;
+}
+
+static int stex_ss_map_sg(struct st_hba *hba,
+	struct req_msg *req, struct st_ccb *ccb)
+{
+	struct scsi_cmnd *cmd;
+	struct scatterlist *sg;
+	struct st_sgtable *dst;
+	struct st_ss_sgitem *table;
+	int i, nseg;
+
+	cmd = ccb->cmd;
+	nseg = scsi_dma_map(cmd);
+	BUG_ON(nseg < 0);
+	if (nseg) {
+		dst = (struct st_sgtable *)req->variable;
+
+		ccb->sg_count = nseg;
+		dst->sg_count = cpu_to_le16((u16)nseg);
+		dst->max_sg_count = cpu_to_le16(hba->host->sg_tablesize);
+		dst->sz_in_byte = cpu_to_le32(scsi_bufflen(cmd));
+
+		table = (struct st_ss_sgitem *)(dst + 1);
+		scsi_for_each_sg(cmd, sg, nseg, i) {
+			table[i].count = cpu_to_le32((u32)sg_dma_len(sg));
+			table[i].addr =
+				cpu_to_le32(sg_dma_address(sg) & 0xffffffff);
+			table[i].addr_hi =
+				cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
+		}
+	}
+
+	return nseg;
+}
+
+static void stex_controller_info(struct st_hba *hba, struct st_ccb *ccb)
+{
+	struct st_frame *p;
+	size_t count = sizeof(struct st_frame);
+
+	p = hba->copy_buffer;
+	scsi_sg_copy_to_buffer(ccb->cmd, p, count);
+	memset(p->base, 0, sizeof(u32)*6);
+	*(unsigned long *)(p->base) = pci_resource_start(hba->pdev, 0);
+	p->rom_addr = 0;
+
+	p->drv_ver.major = ST_VER_MAJOR;
+	p->drv_ver.minor = ST_VER_MINOR;
+	p->drv_ver.oem = ST_OEM;
+	p->drv_ver.build = ST_BUILD_VER;
+
+	p->bus = hba->pdev->bus->number;
+	p->slot = hba->pdev->devfn;
+	p->irq_level = 0;
+	p->irq_vec = hba->pdev->irq;
+	p->id = hba->pdev->vendor << 16 | hba->pdev->device;
+	p->subid =
+		hba->pdev->subsystem_vendor << 16 | hba->pdev->subsystem_device;
+
+	scsi_sg_copy_from_buffer(ccb->cmd, p, count);
+}
+
+static void
+stex_send_cmd(struct st_hba *hba, struct req_msg *req, u16 tag)
+{
+	req->tag = cpu_to_le16(tag);
+
+	hba->ccb[tag].req = req;
+	hba->out_req_cnt++;
+
+	writel(hba->req_head, hba->mmio_base + IMR0);
+	writel(MU_INBOUND_DOORBELL_REQHEADCHANGED, hba->mmio_base + IDBL);
+	readl(hba->mmio_base + IDBL); /* flush */
+}
+
+static void
+stex_ss_send_cmd(struct st_hba *hba, struct req_msg *req, u16 tag)
+{
+	struct scsi_cmnd *cmd;
+	struct st_msg_header *msg_h;
+	dma_addr_t addr;
+
+	req->tag = cpu_to_le16(tag);
+
+	hba->ccb[tag].req = req;
+	hba->out_req_cnt++;
+
+	cmd = hba->ccb[tag].cmd;
+	msg_h = (struct st_msg_header *)req - 1;
+	if (likely(cmd)) {
+		msg_h->channel = (u8)cmd->device->channel;
+		msg_h->timeout = cpu_to_le16(cmd->request->timeout/HZ);
+	}
+	addr = hba->dma_handle + hba->req_head * hba->rq_size;
+	addr += (hba->ccb[tag].sg_count+4)/11;
+	msg_h->handle = cpu_to_le64(addr);
+
+	++hba->req_head;
+	hba->req_head %= hba->rq_count+1;
+
+	writel((addr >> 16) >> 16, hba->mmio_base + YH2I_REQ_HI);
+	readl(hba->mmio_base + YH2I_REQ_HI); /* flush */
+	writel(addr, hba->mmio_base + YH2I_REQ);
+	readl(hba->mmio_base + YH2I_REQ); /* flush */
+}
+
+static int
+stex_slave_config(struct scsi_device *sdev)
+{
+	sdev->use_10_for_rw = 1;
+	sdev->use_10_for_ms = 1;
+	blk_queue_rq_timeout(sdev->request_queue, 60 * HZ);
+
+	return 0;
+}
+
+static int
+stex_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
+{
+	struct st_hba *hba;
+	struct Scsi_Host *host;
+	unsigned int id, lun;
+	struct req_msg *req;
+	u16 tag;
+
+	host = cmd->device->host;
+	id = cmd->device->id;
+	lun = cmd->device->lun;
+	hba = (struct st_hba *) &host->hostdata[0];
+
+	if (unlikely(hba->mu_status == MU_STATE_RESETTING))
+		return SCSI_MLQUEUE_HOST_BUSY;
+
+	switch (cmd->cmnd[0]) {
+	case MODE_SENSE_10:
+	{
+		static char ms10_caching_page[12] =
+			{ 0, 0x12, 0, 0, 0, 0, 0, 0, 0x8, 0xa, 0x4, 0 };
+		unsigned char page;
+
+		page = cmd->cmnd[2] & 0x3f;
+		if (page == 0x8 || page == 0x3f) {
+			scsi_sg_copy_from_buffer(cmd, ms10_caching_page,
+						 sizeof(ms10_caching_page));
+			cmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8;
+			done(cmd);
+		} else
+			stex_invalid_field(cmd, done);
+		return 0;
+	}
+	case REPORT_LUNS:
+		/*
+		 * The shasta firmware does not report actual luns in the
+		 * target, so fail the command to force sequential lun scan.
+		 * Also, the console device does not support this command.
+		 */
+		if (hba->cardtype == st_shasta || id == host->max_id - 1) {
+			stex_invalid_field(cmd, done);
+			return 0;
+		}
+		break;
+	case TEST_UNIT_READY:
+		if (id == host->max_id - 1) {
+			cmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8;
+			done(cmd);
+			return 0;
+		}
+		break;
+	case INQUIRY:
+		if (lun >= host->max_lun) {
+			cmd->result = DID_NO_CONNECT << 16;
+			done(cmd);
+			return 0;
+		}
+		if (id != host->max_id - 1)
+			break;
+		if (!lun && !cmd->device->channel &&
+			(cmd->cmnd[1] & INQUIRY_EVPD) == 0) {
+			scsi_sg_copy_from_buffer(cmd, (void *)console_inq_page,
+						 sizeof(console_inq_page));
+			cmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8;
+			done(cmd);
+		} else
+			stex_invalid_field(cmd, done);
+		return 0;
+	case PASSTHRU_CMD:
+		if (cmd->cmnd[1] == PASSTHRU_GET_DRVVER) {
+			struct st_drvver ver;
+			size_t cp_len = sizeof(ver);
+
+			ver.major = ST_VER_MAJOR;
+			ver.minor = ST_VER_MINOR;
+			ver.oem = ST_OEM;
+			ver.build = ST_BUILD_VER;
+			ver.signature[0] = PASSTHRU_SIGNATURE;
+			ver.console_id = host->max_id - 1;
+			ver.host_no = hba->host->host_no;
+			cp_len = scsi_sg_copy_from_buffer(cmd, &ver, cp_len);
+			cmd->result = sizeof(ver) == cp_len ?
+				DID_OK << 16 | COMMAND_COMPLETE << 8 :
+				DID_ERROR << 16 | COMMAND_COMPLETE << 8;
+			done(cmd);
+			return 0;
+		}
+	default:
+		break;
+	}
+
+	cmd->scsi_done = done;
+
+	tag = cmd->request->tag;
+
+	if (unlikely(tag >= host->can_queue))
+		return SCSI_MLQUEUE_HOST_BUSY;
+
+	req = hba->alloc_rq(hba);
+
+	req->lun = lun;
+	req->target = id;
+
+	/* cdb */
+	memcpy(req->cdb, cmd->cmnd, STEX_CDB_LENGTH);
+
+	if (cmd->sc_data_direction == DMA_FROM_DEVICE)
+		req->data_dir = MSG_DATA_DIR_IN;
+	else if (cmd->sc_data_direction == DMA_TO_DEVICE)
+		req->data_dir = MSG_DATA_DIR_OUT;
+	else
+		req->data_dir = MSG_DATA_DIR_ND;
+
+	hba->ccb[tag].cmd = cmd;
+	hba->ccb[tag].sense_bufflen = SCSI_SENSE_BUFFERSIZE;
+	hba->ccb[tag].sense_buffer = cmd->sense_buffer;
+
+	if (!hba->map_sg(hba, req, &hba->ccb[tag])) {
+		hba->ccb[tag].sg_count = 0;
+		memset(&req->variable[0], 0, 8);
+	}
+
+	hba->send(hba, req, tag);
+	return 0;
+}
+
+static DEF_SCSI_QCMD(stex_queuecommand)
+
+static void stex_scsi_done(struct st_ccb *ccb)
+{
+	struct scsi_cmnd *cmd = ccb->cmd;
+	int result;
+
+	if (ccb->srb_status == SRB_STATUS_SUCCESS || ccb->srb_status == 0) {
+		result = ccb->scsi_status;
+		switch (ccb->scsi_status) {
+		case SAM_STAT_GOOD:
+			result |= DID_OK << 16 | COMMAND_COMPLETE << 8;
+			break;
+		case SAM_STAT_CHECK_CONDITION:
+			result |= DRIVER_SENSE << 24;
+			break;
+		case SAM_STAT_BUSY:
+			result |= DID_BUS_BUSY << 16 | COMMAND_COMPLETE << 8;
+			break;
+		default:
+			result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8;
+			break;
+		}
+	}
+	else if (ccb->srb_status & SRB_SEE_SENSE)
+		result = DRIVER_SENSE << 24 | SAM_STAT_CHECK_CONDITION;
+	else switch (ccb->srb_status) {
+		case SRB_STATUS_SELECTION_TIMEOUT:
+			result = DID_NO_CONNECT << 16 | COMMAND_COMPLETE << 8;
+			break;
+		case SRB_STATUS_BUSY:
+			result = DID_BUS_BUSY << 16 | COMMAND_COMPLETE << 8;
+			break;
+		case SRB_STATUS_INVALID_REQUEST:
+		case SRB_STATUS_ERROR:
+		default:
+			result = DID_ERROR << 16 | COMMAND_COMPLETE << 8;
+			break;
+	}
+
+	cmd->result = result;
+	cmd->scsi_done(cmd);
+}
+
+static void stex_copy_data(struct st_ccb *ccb,
+	struct status_msg *resp, unsigned int variable)
+{
+	if (resp->scsi_status != SAM_STAT_GOOD) {
+		if (ccb->sense_buffer != NULL)
+			memcpy(ccb->sense_buffer, resp->variable,
+				min(variable, ccb->sense_bufflen));
+		return;
+	}
+
+	if (ccb->cmd == NULL)
+		return;
+	scsi_sg_copy_from_buffer(ccb->cmd, resp->variable, variable);
+}
+
+static void stex_check_cmd(struct st_hba *hba,
+	struct st_ccb *ccb, struct status_msg *resp)
+{
+	if (ccb->cmd->cmnd[0] == MGT_CMD &&
+		resp->scsi_status != SAM_STAT_CHECK_CONDITION)
+		scsi_set_resid(ccb->cmd, scsi_bufflen(ccb->cmd) -
+			le32_to_cpu(*(__le32 *)&resp->variable[0]));
+}
+
+static void stex_mu_intr(struct st_hba *hba, u32 doorbell)
+{
+	void __iomem *base = hba->mmio_base;
+	struct status_msg *resp;
+	struct st_ccb *ccb;
+	unsigned int size;
+	u16 tag;
+
+	if (unlikely(!(doorbell & MU_OUTBOUND_DOORBELL_STATUSHEADCHANGED)))
+		return;
+
+	/* status payloads */
+	hba->status_head = readl(base + OMR1);
+	if (unlikely(hba->status_head > hba->sts_count)) {
+		printk(KERN_WARNING DRV_NAME "(%s): invalid status head\n",
+			pci_name(hba->pdev));
+		return;
+	}
+
+	/*
+	 * it's not a valid status payload if:
+	 * 1. there are no pending requests(e.g. during init stage)
+	 * 2. there are some pending requests, but the controller is in
+	 *     reset status, and its type is not st_yosemite
+	 * firmware of st_yosemite in reset status will return pending requests
+	 * to driver, so we allow it to pass
+	 */
+	if (unlikely(hba->out_req_cnt <= 0 ||
+			(hba->mu_status == MU_STATE_RESETTING &&
+			 hba->cardtype != st_yosemite))) {
+		hba->status_tail = hba->status_head;
+		goto update_status;
+	}
+
+	while (hba->status_tail != hba->status_head) {
+		resp = stex_get_status(hba);
+		tag = le16_to_cpu(resp->tag);
+		if (unlikely(tag >= hba->host->can_queue)) {
+			printk(KERN_WARNING DRV_NAME
+				"(%s): invalid tag\n", pci_name(hba->pdev));
+			continue;
+		}
+
+		hba->out_req_cnt--;
+		ccb = &hba->ccb[tag];
+		if (unlikely(hba->wait_ccb == ccb))
+			hba->wait_ccb = NULL;
+		if (unlikely(ccb->req == NULL)) {
+			printk(KERN_WARNING DRV_NAME
+				"(%s): lagging req\n", pci_name(hba->pdev));
+			continue;
+		}
+
+		size = resp->payload_sz * sizeof(u32); /* payload size */
+		if (unlikely(size < sizeof(*resp) - STATUS_VAR_LEN ||
+			size > sizeof(*resp))) {
+			printk(KERN_WARNING DRV_NAME "(%s): bad status size\n",
+				pci_name(hba->pdev));
+		} else {
+			size -= sizeof(*resp) - STATUS_VAR_LEN; /* copy size */
+			if (size)
+				stex_copy_data(ccb, resp, size);
+		}
+
+		ccb->req = NULL;
+		ccb->srb_status = resp->srb_status;
+		ccb->scsi_status = resp->scsi_status;
+
+		if (likely(ccb->cmd != NULL)) {
+			if (hba->cardtype == st_yosemite)
+				stex_check_cmd(hba, ccb, resp);
+
+			if (unlikely(ccb->cmd->cmnd[0] == PASSTHRU_CMD &&
+				ccb->cmd->cmnd[1] == PASSTHRU_GET_ADAPTER))
+				stex_controller_info(hba, ccb);
+
+			scsi_dma_unmap(ccb->cmd);
+			stex_scsi_done(ccb);
+		} else
+			ccb->req_type = 0;
+	}
+
+update_status:
+	writel(hba->status_head, base + IMR1);
+	readl(base + IMR1); /* flush */
+}
+
+static irqreturn_t stex_intr(int irq, void *__hba)
+{
+	struct st_hba *hba = __hba;
+	void __iomem *base = hba->mmio_base;
+	u32 data;
+	unsigned long flags;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+
+	data = readl(base + ODBL);
+
+	if (data && data != 0xffffffff) {
+		/* clear the interrupt */
+		writel(data, base + ODBL);
+		readl(base + ODBL); /* flush */
+		stex_mu_intr(hba, data);
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		if (unlikely(data & MU_OUTBOUND_DOORBELL_REQUEST_RESET &&
+			hba->cardtype == st_shasta))
+			queue_work(hba->work_q, &hba->reset_work);
+		return IRQ_HANDLED;
+	}
+
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	return IRQ_NONE;
+}
+
+static void stex_ss_mu_intr(struct st_hba *hba)
+{
+	struct status_msg *resp;
+	struct st_ccb *ccb;
+	__le32 *scratch;
+	unsigned int size;
+	int count = 0;
+	u32 value;
+	u16 tag;
+
+	if (unlikely(hba->out_req_cnt <= 0 ||
+			hba->mu_status == MU_STATE_RESETTING))
+		return;
+
+	while (count < hba->sts_count) {
+		scratch = hba->scratch + hba->status_tail;
+		value = le32_to_cpu(*scratch);
+		if (unlikely(!(value & SS_STS_NORMAL)))
+			return;
+
+		resp = hba->status_buffer + hba->status_tail;
+		*scratch = 0;
+		++count;
+		++hba->status_tail;
+		hba->status_tail %= hba->sts_count+1;
+
+		tag = (u16)value;
+		if (unlikely(tag >= hba->host->can_queue)) {
+			printk(KERN_WARNING DRV_NAME
+				"(%s): invalid tag\n", pci_name(hba->pdev));
+			continue;
+		}
+
+		hba->out_req_cnt--;
+		ccb = &hba->ccb[tag];
+		if (unlikely(hba->wait_ccb == ccb))
+			hba->wait_ccb = NULL;
+		if (unlikely(ccb->req == NULL)) {
+			printk(KERN_WARNING DRV_NAME
+				"(%s): lagging req\n", pci_name(hba->pdev));
+			continue;
+		}
+
+		ccb->req = NULL;
+		if (likely(value & SS_STS_DONE)) { /* normal case */
+			ccb->srb_status = SRB_STATUS_SUCCESS;
+			ccb->scsi_status = SAM_STAT_GOOD;
+		} else {
+			ccb->srb_status = resp->srb_status;
+			ccb->scsi_status = resp->scsi_status;
+			size = resp->payload_sz * sizeof(u32);
+			if (unlikely(size < sizeof(*resp) - STATUS_VAR_LEN ||
+				size > sizeof(*resp))) {
+				printk(KERN_WARNING DRV_NAME
+					"(%s): bad status size\n",
+					pci_name(hba->pdev));
+			} else {
+				size -= sizeof(*resp) - STATUS_VAR_LEN;
+				if (size)
+					stex_copy_data(ccb, resp, size);
+			}
+			if (likely(ccb->cmd != NULL))
+				stex_check_cmd(hba, ccb, resp);
+		}
+
+		if (likely(ccb->cmd != NULL)) {
+			scsi_dma_unmap(ccb->cmd);
+			stex_scsi_done(ccb);
+		} else
+			ccb->req_type = 0;
+	}
+}
+
+static irqreturn_t stex_ss_intr(int irq, void *__hba)
+{
+	struct st_hba *hba = __hba;
+	void __iomem *base = hba->mmio_base;
+	u32 data;
+	unsigned long flags;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+
+	data = readl(base + YI2H_INT);
+	if (data && data != 0xffffffff) {
+		/* clear the interrupt */
+		writel(data, base + YI2H_INT_C);
+		stex_ss_mu_intr(hba);
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		if (unlikely(data & SS_I2H_REQUEST_RESET))
+			queue_work(hba->work_q, &hba->reset_work);
+		return IRQ_HANDLED;
+	}
+
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	return IRQ_NONE;
+}
+
+static int stex_common_handshake(struct st_hba *hba)
+{
+	void __iomem *base = hba->mmio_base;
+	struct handshake_frame *h;
+	dma_addr_t status_phys;
+	u32 data;
+	unsigned long before;
+
+	if (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
+		writel(MU_INBOUND_DOORBELL_HANDSHAKE, base + IDBL);
+		readl(base + IDBL);
+		before = jiffies;
+		while (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
+			if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
+				printk(KERN_ERR DRV_NAME
+					"(%s): no handshake signature\n",
+					pci_name(hba->pdev));
+				return -1;
+			}
+			rmb();
+			msleep(1);
+		}
+	}
+
+	udelay(10);
+
+	data = readl(base + OMR1);
+	if ((data & 0xffff0000) == MU_HANDSHAKE_SIGNATURE_HALF) {
+		data &= 0x0000ffff;
+		if (hba->host->can_queue > data) {
+			hba->host->can_queue = data;
+			hba->host->cmd_per_lun = data;
+		}
+	}
+
+	h = (struct handshake_frame *)hba->status_buffer;
+	h->rb_phy = cpu_to_le64(hba->dma_handle);
+	h->req_sz = cpu_to_le16(hba->rq_size);
+	h->req_cnt = cpu_to_le16(hba->rq_count+1);
+	h->status_sz = cpu_to_le16(sizeof(struct status_msg));
+	h->status_cnt = cpu_to_le16(hba->sts_count+1);
+	stex_gettime(&h->hosttime);
+	h->partner_type = HMU_PARTNER_TYPE;
+	if (hba->extra_offset) {
+		h->extra_offset = cpu_to_le32(hba->extra_offset);
+		h->extra_size = cpu_to_le32(hba->dma_size - hba->extra_offset);
+	} else
+		h->extra_offset = h->extra_size = 0;
+
+	status_phys = hba->dma_handle + (hba->rq_count+1) * hba->rq_size;
+	writel(status_phys, base + IMR0);
+	readl(base + IMR0);
+	writel((status_phys >> 16) >> 16, base + IMR1);
+	readl(base + IMR1);
+
+	writel((status_phys >> 16) >> 16, base + OMR0); /* old fw compatible */
+	readl(base + OMR0);
+	writel(MU_INBOUND_DOORBELL_HANDSHAKE, base + IDBL);
+	readl(base + IDBL); /* flush */
+
+	udelay(10);
+	before = jiffies;
+	while (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
+		if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
+			printk(KERN_ERR DRV_NAME
+				"(%s): no signature after handshake frame\n",
+				pci_name(hba->pdev));
+			return -1;
+		}
+		rmb();
+		msleep(1);
+	}
+
+	writel(0, base + IMR0);
+	readl(base + IMR0);
+	writel(0, base + OMR0);
+	readl(base + OMR0);
+	writel(0, base + IMR1);
+	readl(base + IMR1);
+	writel(0, base + OMR1);
+	readl(base + OMR1); /* flush */
+	return 0;
+}
+
+static int stex_ss_handshake(struct st_hba *hba)
+{
+	void __iomem *base = hba->mmio_base;
+	struct st_msg_header *msg_h;
+	struct handshake_frame *h;
+	__le32 *scratch;
+	u32 data, scratch_size;
+	unsigned long before;
+	int ret = 0;
+
+	before = jiffies;
+	while ((readl(base + YIOA_STATUS) & SS_MU_OPERATIONAL) == 0) {
+		if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
+			printk(KERN_ERR DRV_NAME
+				"(%s): firmware not operational\n",
+				pci_name(hba->pdev));
+			return -1;
+		}
+		msleep(1);
+	}
+
+	msg_h = (struct st_msg_header *)hba->dma_mem;
+	msg_h->handle = cpu_to_le64(hba->dma_handle);
+	msg_h->flag = SS_HEAD_HANDSHAKE;
+
+	h = (struct handshake_frame *)(msg_h + 1);
+	h->rb_phy = cpu_to_le64(hba->dma_handle);
+	h->req_sz = cpu_to_le16(hba->rq_size);
+	h->req_cnt = cpu_to_le16(hba->rq_count+1);
+	h->status_sz = cpu_to_le16(sizeof(struct status_msg));
+	h->status_cnt = cpu_to_le16(hba->sts_count+1);
+	stex_gettime(&h->hosttime);
+	h->partner_type = HMU_PARTNER_TYPE;
+	h->extra_offset = h->extra_size = 0;
+	scratch_size = (hba->sts_count+1)*sizeof(u32);
+	h->scratch_size = cpu_to_le32(scratch_size);
+
+	data = readl(base + YINT_EN);
+	data &= ~4;
+	writel(data, base + YINT_EN);
+	writel((hba->dma_handle >> 16) >> 16, base + YH2I_REQ_HI);
+	readl(base + YH2I_REQ_HI);
+	writel(hba->dma_handle, base + YH2I_REQ);
+	readl(base + YH2I_REQ); /* flush */
+
+	scratch = hba->scratch;
+	before = jiffies;
+	while (!(le32_to_cpu(*scratch) & SS_STS_HANDSHAKE)) {
+		if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
+			printk(KERN_ERR DRV_NAME
+				"(%s): no signature after handshake frame\n",
+				pci_name(hba->pdev));
+			ret = -1;
+			break;
+		}
+		rmb();
+		msleep(1);
+	}
+
+	memset(scratch, 0, scratch_size);
+	msg_h->flag = 0;
+	return ret;
+}
+
+static int stex_handshake(struct st_hba *hba)
+{
+	int err;
+	unsigned long flags;
+	unsigned int mu_status;
+
+	err = (hba->cardtype == st_yel) ?
+		stex_ss_handshake(hba) : stex_common_handshake(hba);
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	mu_status = hba->mu_status;
+	if (err == 0) {
+		hba->req_head = 0;
+		hba->req_tail = 0;
+		hba->status_head = 0;
+		hba->status_tail = 0;
+		hba->out_req_cnt = 0;
+		hba->mu_status = MU_STATE_STARTED;
+	} else
+		hba->mu_status = MU_STATE_FAILED;
+	if (mu_status == MU_STATE_RESETTING)
+		wake_up_all(&hba->reset_waitq);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	return err;
+}
+
+static int stex_abort(struct scsi_cmnd *cmd)
+{
+	struct Scsi_Host *host = cmd->device->host;
+	struct st_hba *hba = (struct st_hba *)host->hostdata;
+	u16 tag = cmd->request->tag;
+	void __iomem *base;
+	u32 data;
+	int result = SUCCESS;
+	unsigned long flags;
+
+	scmd_printk(KERN_INFO, cmd, "aborting command\n");
+
+	base = hba->mmio_base;
+	spin_lock_irqsave(host->host_lock, flags);
+	if (tag < host->can_queue &&
+		hba->ccb[tag].req && hba->ccb[tag].cmd == cmd)
+		hba->wait_ccb = &hba->ccb[tag];
+	else
+		goto out;
+
+	if (hba->cardtype == st_yel) {
+		data = readl(base + YI2H_INT);
+		if (data == 0 || data == 0xffffffff)
+			goto fail_out;
+
+		writel(data, base + YI2H_INT_C);
+		stex_ss_mu_intr(hba);
+	} else {
+		data = readl(base + ODBL);
+		if (data == 0 || data == 0xffffffff)
+			goto fail_out;
+
+		writel(data, base + ODBL);
+		readl(base + ODBL); /* flush */
+
+		stex_mu_intr(hba, data);
+	}
+	if (hba->wait_ccb == NULL) {
+		printk(KERN_WARNING DRV_NAME
+			"(%s): lost interrupt\n", pci_name(hba->pdev));
+		goto out;
+	}
+
+fail_out:
+	scsi_dma_unmap(cmd);
+	hba->wait_ccb->req = NULL; /* nullify the req's future return */
+	hba->wait_ccb = NULL;
+	result = FAILED;
+out:
+	spin_unlock_irqrestore(host->host_lock, flags);
+	return result;
+}
+
+static void stex_hard_reset(struct st_hba *hba)
+{
+	struct pci_bus *bus;
+	int i;
+	u16 pci_cmd;
+	u8 pci_bctl;
+
+	for (i = 0; i < 16; i++)
+		pci_read_config_dword(hba->pdev, i * 4,
+			&hba->pdev->saved_config_space[i]);
+
+	/* Reset secondary bus. Our controller(MU/ATU) is the only device on
+	   secondary bus. Consult Intel 80331/3 developer's manual for detail */
+	bus = hba->pdev->bus;
+	pci_read_config_byte(bus->self, PCI_BRIDGE_CONTROL, &pci_bctl);
+	pci_bctl |= PCI_BRIDGE_CTL_BUS_RESET;
+	pci_write_config_byte(bus->self, PCI_BRIDGE_CONTROL, pci_bctl);
+
+	/*
+	 * 1 ms may be enough for 8-port controllers. But 16-port controllers
+	 * require more time to finish bus reset. Use 100 ms here for safety
+	 */
+	msleep(100);
+	pci_bctl &= ~PCI_BRIDGE_CTL_BUS_RESET;
+	pci_write_config_byte(bus->self, PCI_BRIDGE_CONTROL, pci_bctl);
+
+	for (i = 0; i < MU_HARD_RESET_WAIT; i++) {
+		pci_read_config_word(hba->pdev, PCI_COMMAND, &pci_cmd);
+		if (pci_cmd != 0xffff && (pci_cmd & PCI_COMMAND_MASTER))
+			break;
+		msleep(1);
+	}
+
+	ssleep(5);
+	for (i = 0; i < 16; i++)
+		pci_write_config_dword(hba->pdev, i * 4,
+			hba->pdev->saved_config_space[i]);
+}
+
+static int stex_yos_reset(struct st_hba *hba)
+{
+	void __iomem *base;
+	unsigned long flags, before;
+	int ret = 0;
+
+	base = hba->mmio_base;
+	writel(MU_INBOUND_DOORBELL_RESET, base + IDBL);
+	readl(base + IDBL); /* flush */
+	before = jiffies;
+	while (hba->out_req_cnt > 0) {
+		if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ)) {
+			printk(KERN_WARNING DRV_NAME
+				"(%s): reset timeout\n", pci_name(hba->pdev));
+			ret = -1;
+			break;
+		}
+		msleep(1);
+	}
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (ret == -1)
+		hba->mu_status = MU_STATE_FAILED;
+	else
+		hba->mu_status = MU_STATE_STARTED;
+	wake_up_all(&hba->reset_waitq);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	return ret;
+}
+
+static void stex_ss_reset(struct st_hba *hba)
+{
+	writel(SS_H2I_INT_RESET, hba->mmio_base + YH2I_INT);
+	readl(hba->mmio_base + YH2I_INT);
+	ssleep(5);
+}
+
+static int stex_do_reset(struct st_hba *hba)
+{
+	struct st_ccb *ccb;
+	unsigned long flags;
+	unsigned int mu_status = MU_STATE_RESETTING;
+	u16 tag;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (hba->mu_status == MU_STATE_STARTING) {
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		printk(KERN_INFO DRV_NAME "(%s): request reset during init\n",
+			pci_name(hba->pdev));
+		return 0;
+	}
+	while (hba->mu_status == MU_STATE_RESETTING) {
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		wait_event_timeout(hba->reset_waitq,
+				   hba->mu_status != MU_STATE_RESETTING,
+				   MU_MAX_DELAY * HZ);
+		spin_lock_irqsave(hba->host->host_lock, flags);
+		mu_status = hba->mu_status;
+	}
+
+	if (mu_status != MU_STATE_RESETTING) {
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		return (mu_status == MU_STATE_STARTED) ? 0 : -1;
+	}
+
+	hba->mu_status = MU_STATE_RESETTING;
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	if (hba->cardtype == st_yosemite)
+		return stex_yos_reset(hba);
+
+	if (hba->cardtype == st_shasta)
+		stex_hard_reset(hba);
+	else if (hba->cardtype == st_yel)
+		stex_ss_reset(hba);
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	for (tag = 0; tag < hba->host->can_queue; tag++) {
+		ccb = &hba->ccb[tag];
+		if (ccb->req == NULL)
+			continue;
+		ccb->req = NULL;
+		if (ccb->cmd) {
+			scsi_dma_unmap(ccb->cmd);
+			ccb->cmd->result = DID_RESET << 16;
+			ccb->cmd->scsi_done(ccb->cmd);
+			ccb->cmd = NULL;
+		}
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	if (stex_handshake(hba) == 0)
+		return 0;
+
+	printk(KERN_WARNING DRV_NAME "(%s): resetting: handshake failed\n",
+		pci_name(hba->pdev));
+	return -1;
+}
+
+static int stex_reset(struct scsi_cmnd *cmd)
+{
+	struct st_hba *hba;
+
+	hba = (struct st_hba *) &cmd->device->host->hostdata[0];
+
+	shost_printk(KERN_INFO, cmd->device->host,
+		     "resetting host\n");
+
+	return stex_do_reset(hba) ? FAILED : SUCCESS;
+}
+
+static void stex_reset_work(struct work_struct *work)
+{
+	struct st_hba *hba = container_of(work, struct st_hba, reset_work);
+
+	stex_do_reset(hba);
+}
+
+static int stex_biosparam(struct scsi_device *sdev,
+	struct block_device *bdev, sector_t capacity, int geom[])
+{
+	int heads = 255, sectors = 63;
+
+	if (capacity < 0x200000) {
+		heads = 64;
+		sectors = 32;
+	}
+
+	sector_div(capacity, heads * sectors);
+
+	geom[0] = heads;
+	geom[1] = sectors;
+	geom[2] = capacity;
+
+	return 0;
+}
+
+static struct scsi_host_template driver_template = {
+	.module				= THIS_MODULE,
+	.name				= DRV_NAME,
+	.proc_name			= DRV_NAME,
+	.bios_param			= stex_biosparam,
+	.queuecommand			= stex_queuecommand,
+	.slave_configure		= stex_slave_config,
+	.eh_abort_handler		= stex_abort,
+	.eh_host_reset_handler		= stex_reset,
+	.this_id			= -1,
+	.use_blk_tags			= 1,
+};
+
+static struct pci_device_id stex_pci_tbl[] = {
+	/* st_shasta */
+	{ 0x105a, 0x8350, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+		st_shasta }, /* SuperTrak EX8350/8300/16350/16300 */
+	{ 0x105a, 0xc350, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+		st_shasta }, /* SuperTrak EX12350 */
+	{ 0x105a, 0x4302, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+		st_shasta }, /* SuperTrak EX4350 */
+	{ 0x105a, 0xe350, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+		st_shasta }, /* SuperTrak EX24350 */
+
+	/* st_vsc */
+	{ 0x105a, 0x7250, PCI_ANY_ID, PCI_ANY_ID, 0, 0, st_vsc },
+
+	/* st_yosemite */
+	{ 0x105a, 0x8650, 0x105a, PCI_ANY_ID, 0, 0, st_yosemite },
+
+	/* st_seq */
+	{ 0x105a, 0x3360, PCI_ANY_ID, PCI_ANY_ID, 0, 0, st_seq },
+
+	/* st_yel */
+	{ 0x105a, 0x8650, 0x1033, PCI_ANY_ID, 0, 0, st_yel },
+	{ 0x105a, 0x8760, PCI_ANY_ID, PCI_ANY_ID, 0, 0, st_yel },
+	{ }	/* terminate list */
+};
+
+static struct st_card_info stex_card_info[] = {
+	/* st_shasta */
+	{
+		.max_id		= 17,
+		.max_lun	= 8,
+		.max_channel	= 0,
+		.rq_count	= 32,
+		.rq_size	= 1048,
+		.sts_count	= 32,
+		.alloc_rq	= stex_alloc_req,
+		.map_sg		= stex_map_sg,
+		.send		= stex_send_cmd,
+	},
+
+	/* st_vsc */
+	{
+		.max_id		= 129,
+		.max_lun	= 1,
+		.max_channel	= 0,
+		.rq_count	= 32,
+		.rq_size	= 1048,
+		.sts_count	= 32,
+		.alloc_rq	= stex_alloc_req,
+		.map_sg		= stex_map_sg,
+		.send		= stex_send_cmd,
+	},
+
+	/* st_yosemite */
+	{
+		.max_id		= 2,
+		.max_lun	= 256,
+		.max_channel	= 0,
+		.rq_count	= 256,
+		.rq_size	= 1048,
+		.sts_count	= 256,
+		.alloc_rq	= stex_alloc_req,
+		.map_sg		= stex_map_sg,
+		.send		= stex_send_cmd,
+	},
+
+	/* st_seq */
+	{
+		.max_id		= 129,
+		.max_lun	= 1,
+		.max_channel	= 0,
+		.rq_count	= 32,
+		.rq_size	= 1048,
+		.sts_count	= 32,
+		.alloc_rq	= stex_alloc_req,
+		.map_sg		= stex_map_sg,
+		.send		= stex_send_cmd,
+	},
+
+	/* st_yel */
+	{
+		.max_id		= 129,
+		.max_lun	= 256,
+		.max_channel	= 3,
+		.rq_count	= 801,
+		.rq_size	= 512,
+		.sts_count	= 801,
+		.alloc_rq	= stex_ss_alloc_req,
+		.map_sg		= stex_ss_map_sg,
+		.send		= stex_ss_send_cmd,
+	},
+};
+
+static int stex_set_dma_mask(struct pci_dev * pdev)
+{
+	int ret;
+
+	if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))
+		&& !pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)))
+		return 0;
+	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+	if (!ret)
+		ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
+	return ret;
+}
+
+static int stex_request_irq(struct st_hba *hba)
+{
+	struct pci_dev *pdev = hba->pdev;
+	int status;
+
+	if (msi) {
+		status = pci_enable_msi(pdev);
+		if (status != 0)
+			printk(KERN_ERR DRV_NAME
+				"(%s): error %d setting up MSI\n",
+				pci_name(pdev), status);
+		else
+			hba->msi_enabled = 1;
+	} else
+		hba->msi_enabled = 0;
+
+	status = request_irq(pdev->irq, hba->cardtype == st_yel ?
+		stex_ss_intr : stex_intr, IRQF_SHARED, DRV_NAME, hba);
+
+	if (status != 0) {
+		if (hba->msi_enabled)
+			pci_disable_msi(pdev);
+	}
+	return status;
+}
+
+static void stex_free_irq(struct st_hba *hba)
+{
+	struct pci_dev *pdev = hba->pdev;
+
+	free_irq(pdev->irq, hba);
+	if (hba->msi_enabled)
+		pci_disable_msi(pdev);
+}
+
+static int stex_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct st_hba *hba;
+	struct Scsi_Host *host;
+	const struct st_card_info *ci = NULL;
+	u32 sts_offset, cp_offset, scratch_offset;
+	int err;
+
+	err = pci_enable_device(pdev);
+	if (err)
+		return err;
+
+	pci_set_master(pdev);
+
+	host = scsi_host_alloc(&driver_template, sizeof(struct st_hba));
+
+	if (!host) {
+		printk(KERN_ERR DRV_NAME "(%s): scsi_host_alloc failed\n",
+			pci_name(pdev));
+		err = -ENOMEM;
+		goto out_disable;
+	}
+
+	hba = (struct st_hba *)host->hostdata;
+	memset(hba, 0, sizeof(struct st_hba));
+
+	err = pci_request_regions(pdev, DRV_NAME);
+	if (err < 0) {
+		printk(KERN_ERR DRV_NAME "(%s): request regions failed\n",
+			pci_name(pdev));
+		goto out_scsi_host_put;
+	}
+
+	hba->mmio_base = pci_ioremap_bar(pdev, 0);
+	if ( !hba->mmio_base) {
+		printk(KERN_ERR DRV_NAME "(%s): memory map failed\n",
+			pci_name(pdev));
+		err = -ENOMEM;
+		goto out_release_regions;
+	}
+
+	err = stex_set_dma_mask(pdev);
+	if (err) {
+		printk(KERN_ERR DRV_NAME "(%s): set dma mask failed\n",
+			pci_name(pdev));
+		goto out_iounmap;
+	}
+
+	hba->cardtype = (unsigned int) id->driver_data;
+	ci = &stex_card_info[hba->cardtype];
+	sts_offset = scratch_offset = (ci->rq_count+1) * ci->rq_size;
+	if (hba->cardtype == st_yel)
+		sts_offset += (ci->sts_count+1) * sizeof(u32);
+	cp_offset = sts_offset + (ci->sts_count+1) * sizeof(struct status_msg);
+	hba->dma_size = cp_offset + sizeof(struct st_frame);
+	if (hba->cardtype == st_seq ||
+		(hba->cardtype == st_vsc && (pdev->subsystem_device & 1))) {
+		hba->extra_offset = hba->dma_size;
+		hba->dma_size += ST_ADDITIONAL_MEM;
+	}
+	hba->dma_mem = dma_alloc_coherent(&pdev->dev,
+		hba->dma_size, &hba->dma_handle, GFP_KERNEL);
+	if (!hba->dma_mem) {
+		/* Retry minimum coherent mapping for st_seq and st_vsc */
+		if (hba->cardtype == st_seq ||
+		    (hba->cardtype == st_vsc && (pdev->subsystem_device & 1))) {
+			printk(KERN_WARNING DRV_NAME
+				"(%s): allocating min buffer for controller\n",
+				pci_name(pdev));
+			hba->dma_size = hba->extra_offset
+				+ ST_ADDITIONAL_MEM_MIN;
+			hba->dma_mem = dma_alloc_coherent(&pdev->dev,
+				hba->dma_size, &hba->dma_handle, GFP_KERNEL);
+		}
+
+		if (!hba->dma_mem) {
+			err = -ENOMEM;
+			printk(KERN_ERR DRV_NAME "(%s): dma mem alloc failed\n",
+				pci_name(pdev));
+			goto out_iounmap;
+		}
+	}
+
+	hba->ccb = kcalloc(ci->rq_count, sizeof(struct st_ccb), GFP_KERNEL);
+	if (!hba->ccb) {
+		err = -ENOMEM;
+		printk(KERN_ERR DRV_NAME "(%s): ccb alloc failed\n",
+			pci_name(pdev));
+		goto out_pci_free;
+	}
+
+	if (hba->cardtype == st_yel)
+		hba->scratch = (__le32 *)(hba->dma_mem + scratch_offset);
+	hba->status_buffer = (struct status_msg *)(hba->dma_mem + sts_offset);
+	hba->copy_buffer = hba->dma_mem + cp_offset;
+	hba->rq_count = ci->rq_count;
+	hba->rq_size = ci->rq_size;
+	hba->sts_count = ci->sts_count;
+	hba->alloc_rq = ci->alloc_rq;
+	hba->map_sg = ci->map_sg;
+	hba->send = ci->send;
+	hba->mu_status = MU_STATE_STARTING;
+
+	if (hba->cardtype == st_yel)
+		host->sg_tablesize = 38;
+	else
+		host->sg_tablesize = 32;
+	host->can_queue = ci->rq_count;
+	host->cmd_per_lun = ci->rq_count;
+	host->max_id = ci->max_id;
+	host->max_lun = ci->max_lun;
+	host->max_channel = ci->max_channel;
+	host->unique_id = host->host_no;
+	host->max_cmd_len = STEX_CDB_LENGTH;
+
+	hba->host = host;
+	hba->pdev = pdev;
+	init_waitqueue_head(&hba->reset_waitq);
+
+	snprintf(hba->work_q_name, sizeof(hba->work_q_name),
+		 "stex_wq_%d", host->host_no);
+	hba->work_q = create_singlethread_workqueue(hba->work_q_name);
+	if (!hba->work_q) {
+		printk(KERN_ERR DRV_NAME "(%s): create workqueue failed\n",
+			pci_name(pdev));
+		err = -ENOMEM;
+		goto out_ccb_free;
+	}
+	INIT_WORK(&hba->reset_work, stex_reset_work);
+
+	err = stex_request_irq(hba);
+	if (err) {
+		printk(KERN_ERR DRV_NAME "(%s): request irq failed\n",
+			pci_name(pdev));
+		goto out_free_wq;
+	}
+
+	err = stex_handshake(hba);
+	if (err)
+		goto out_free_irq;
+
+	err = scsi_init_shared_tag_map(host, host->can_queue);
+	if (err) {
+		printk(KERN_ERR DRV_NAME "(%s): init shared queue failed\n",
+			pci_name(pdev));
+		goto out_free_irq;
+	}
+
+	pci_set_drvdata(pdev, hba);
+
+	err = scsi_add_host(host, &pdev->dev);
+	if (err) {
+		printk(KERN_ERR DRV_NAME "(%s): scsi_add_host failed\n",
+			pci_name(pdev));
+		goto out_free_irq;
+	}
+
+	scsi_scan_host(host);
+
+	return 0;
+
+out_free_irq:
+	stex_free_irq(hba);
+out_free_wq:
+	destroy_workqueue(hba->work_q);
+out_ccb_free:
+	kfree(hba->ccb);
+out_pci_free:
+	dma_free_coherent(&pdev->dev, hba->dma_size,
+			  hba->dma_mem, hba->dma_handle);
+out_iounmap:
+	iounmap(hba->mmio_base);
+out_release_regions:
+	pci_release_regions(pdev);
+out_scsi_host_put:
+	scsi_host_put(host);
+out_disable:
+	pci_disable_device(pdev);
+
+	return err;
+}
+
+static void stex_hba_stop(struct st_hba *hba)
+{
+	struct req_msg *req;
+	struct st_msg_header *msg_h;
+	unsigned long flags;
+	unsigned long before;
+	u16 tag = 0;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	req = hba->alloc_rq(hba);
+	if (hba->cardtype == st_yel) {
+		msg_h = (struct st_msg_header *)req - 1;
+		memset(msg_h, 0, hba->rq_size);
+	} else
+		memset(req, 0, hba->rq_size);
+
+	if (hba->cardtype == st_yosemite || hba->cardtype == st_yel) {
+		req->cdb[0] = MGT_CMD;
+		req->cdb[1] = MGT_CMD_SIGNATURE;
+		req->cdb[2] = CTLR_CONFIG_CMD;
+		req->cdb[3] = CTLR_SHUTDOWN;
+	} else {
+		req->cdb[0] = CONTROLLER_CMD;
+		req->cdb[1] = CTLR_POWER_STATE_CHANGE;
+		req->cdb[2] = CTLR_POWER_SAVING;
+	}
+
+	hba->ccb[tag].cmd = NULL;
+	hba->ccb[tag].sg_count = 0;
+	hba->ccb[tag].sense_bufflen = 0;
+	hba->ccb[tag].sense_buffer = NULL;
+	hba->ccb[tag].req_type = PASSTHRU_REQ_TYPE;
+
+	hba->send(hba, req, tag);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	before = jiffies;
+	while (hba->ccb[tag].req_type & PASSTHRU_REQ_TYPE) {
+		if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ)) {
+			hba->ccb[tag].req_type = 0;
+			return;
+		}
+		msleep(1);
+	}
+}
+
+static void stex_hba_free(struct st_hba *hba)
+{
+	stex_free_irq(hba);
+
+	destroy_workqueue(hba->work_q);
+
+	iounmap(hba->mmio_base);
+
+	pci_release_regions(hba->pdev);
+
+	kfree(hba->ccb);
+
+	dma_free_coherent(&hba->pdev->dev, hba->dma_size,
+			  hba->dma_mem, hba->dma_handle);
+}
+
+static void stex_remove(struct pci_dev *pdev)
+{
+	struct st_hba *hba = pci_get_drvdata(pdev);
+
+	scsi_remove_host(hba->host);
+
+	stex_hba_stop(hba);
+
+	stex_hba_free(hba);
+
+	scsi_host_put(hba->host);
+
+	pci_disable_device(pdev);
+}
+
+static void stex_shutdown(struct pci_dev *pdev)
+{
+	struct st_hba *hba = pci_get_drvdata(pdev);
+
+	stex_hba_stop(hba);
+}
+
+MODULE_DEVICE_TABLE(pci, stex_pci_tbl);
+
+static struct pci_driver stex_pci_driver = {
+	.name		= DRV_NAME,
+	.id_table	= stex_pci_tbl,
+	.probe		= stex_probe,
+	.remove		= stex_remove,
+	.shutdown	= stex_shutdown,
+};
+
+static int __init stex_init(void)
+{
+	printk(KERN_INFO DRV_NAME
+		": Promise SuperTrak EX Driver version: %s\n",
+		 ST_DRIVER_VERSION);
+
+	return pci_register_driver(&stex_pci_driver);
+}
+
+static void __exit stex_exit(void)
+{
+	pci_unregister_driver(&stex_pci_driver);
+}
+
+module_init(stex_init);
+module_exit(stex_exit);