Merge commit 'v3.0-rc7' into devicetree/next

1 files changed, 2751 insertions, 0 deletions

diff --git a/drivers/scsi/isci/host.c b/drivers/scsi/isci/host.c
new file mode 100644
index 00000000000..26072f1e985
--- /dev/null
+++ b/drivers/scsi/isci/host.c
@@ -0,0 +1,2751 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Intel Corporation nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <linux/circ_buf.h>
+#include <linux/device.h>
+#include <scsi/sas.h>
+#include "host.h"
+#include "isci.h"
+#include "port.h"
+#include "host.h"
+#include "probe_roms.h"
+#include "remote_device.h"
+#include "request.h"
+#include "scu_completion_codes.h"
+#include "scu_event_codes.h"
+#include "registers.h"
+#include "scu_remote_node_context.h"
+#include "scu_task_context.h"
+
+#define SCU_CONTEXT_RAM_INIT_STALL_TIME      200
+
+#define smu_max_ports(dcc_value) \
+	(\
+		(((dcc_value) & SMU_DEVICE_CONTEXT_CAPACITY_MAX_LP_MASK) \
+		 >> SMU_DEVICE_CONTEXT_CAPACITY_MAX_LP_SHIFT) + 1 \
+	)
+
+#define smu_max_task_contexts(dcc_value)	\
+	(\
+		(((dcc_value) & SMU_DEVICE_CONTEXT_CAPACITY_MAX_TC_MASK) \
+		 >> SMU_DEVICE_CONTEXT_CAPACITY_MAX_TC_SHIFT) + 1 \
+	)
+
+#define smu_max_rncs(dcc_value) \
+	(\
+		(((dcc_value) & SMU_DEVICE_CONTEXT_CAPACITY_MAX_RNC_MASK) \
+		 >> SMU_DEVICE_CONTEXT_CAPACITY_MAX_RNC_SHIFT) + 1 \
+	)
+
+#define SCIC_SDS_CONTROLLER_PHY_START_TIMEOUT      100
+
+/**
+ *
+ *
+ * The number of milliseconds to wait while a given phy is consuming power
+ * before allowing another set of phys to consume power. Ultimately, this will
+ * be specified by OEM parameter.
+ */
+#define SCIC_SDS_CONTROLLER_POWER_CONTROL_INTERVAL 500
+
+/**
+ * NORMALIZE_PUT_POINTER() -
+ *
+ * This macro will normalize the completion queue put pointer so its value can
+ * be used as an array inde
+ */
+#define NORMALIZE_PUT_POINTER(x) \
+	((x) & SMU_COMPLETION_QUEUE_PUT_POINTER_MASK)
+
+
+/**
+ * NORMALIZE_EVENT_POINTER() -
+ *
+ * This macro will normalize the completion queue event entry so its value can
+ * be used as an index.
+ */
+#define NORMALIZE_EVENT_POINTER(x) \
+	(\
+		((x) & SMU_COMPLETION_QUEUE_GET_EVENT_POINTER_MASK) \
+		>> SMU_COMPLETION_QUEUE_GET_EVENT_POINTER_SHIFT	\
+	)
+
+/**
+ * NORMALIZE_GET_POINTER() -
+ *
+ * This macro will normalize the completion queue get pointer so its value can
+ * be used as an index into an array
+ */
+#define NORMALIZE_GET_POINTER(x) \
+	((x) & SMU_COMPLETION_QUEUE_GET_POINTER_MASK)
+
+/**
+ * NORMALIZE_GET_POINTER_CYCLE_BIT() -
+ *
+ * This macro will normalize the completion queue cycle pointer so it matches
+ * the completion queue cycle bit
+ */
+#define NORMALIZE_GET_POINTER_CYCLE_BIT(x) \
+	((SMU_CQGR_CYCLE_BIT & (x)) << (31 - SMU_COMPLETION_QUEUE_GET_CYCLE_BIT_SHIFT))
+
+/**
+ * COMPLETION_QUEUE_CYCLE_BIT() -
+ *
+ * This macro will return the cycle bit of the completion queue entry
+ */
+#define COMPLETION_QUEUE_CYCLE_BIT(x) ((x) & 0x80000000)
+
+/* Init the state machine and call the state entry function (if any) */
+void sci_init_sm(struct sci_base_state_machine *sm,
+		 const struct sci_base_state *state_table, u32 initial_state)
+{
+	sci_state_transition_t handler;
+
+	sm->initial_state_id    = initial_state;
+	sm->previous_state_id   = initial_state;
+	sm->current_state_id    = initial_state;
+	sm->state_table         = state_table;
+
+	handler = sm->state_table[initial_state].enter_state;
+	if (handler)
+		handler(sm);
+}
+
+/* Call the state exit fn, update the current state, call the state entry fn */
+void sci_change_state(struct sci_base_state_machine *sm, u32 next_state)
+{
+	sci_state_transition_t handler;
+
+	handler = sm->state_table[sm->current_state_id].exit_state;
+	if (handler)
+		handler(sm);
+
+	sm->previous_state_id = sm->current_state_id;
+	sm->current_state_id = next_state;
+
+	handler = sm->state_table[sm->current_state_id].enter_state;
+	if (handler)
+		handler(sm);
+}
+
+static bool sci_controller_completion_queue_has_entries(struct isci_host *ihost)
+{
+	u32 get_value = ihost->completion_queue_get;
+	u32 get_index = get_value & SMU_COMPLETION_QUEUE_GET_POINTER_MASK;
+
+	if (NORMALIZE_GET_POINTER_CYCLE_BIT(get_value) ==
+	    COMPLETION_QUEUE_CYCLE_BIT(ihost->completion_queue[get_index]))
+		return true;
+
+	return false;
+}
+
+static bool sci_controller_isr(struct isci_host *ihost)
+{
+	if (sci_controller_completion_queue_has_entries(ihost)) {
+		return true;
+	} else {
+		/*
+		 * we have a spurious interrupt it could be that we have already
+		 * emptied the completion queue from a previous interrupt */
+		writel(SMU_ISR_COMPLETION, &ihost->smu_registers->interrupt_status);
+
+		/*
+		 * There is a race in the hardware that could cause us not to be notified
+		 * of an interrupt completion if we do not take this step.  We will mask
+		 * then unmask the interrupts so if there is another interrupt pending
+		 * the clearing of the interrupt source we get the next interrupt message. */
+		writel(0xFF000000, &ihost->smu_registers->interrupt_mask);
+		writel(0, &ihost->smu_registers->interrupt_mask);
+	}
+
+	return false;
+}
+
+irqreturn_t isci_msix_isr(int vec, void *data)
+{
+	struct isci_host *ihost = data;
+
+	if (sci_controller_isr(ihost))
+		tasklet_schedule(&ihost->completion_tasklet);
+
+	return IRQ_HANDLED;
+}
+
+static bool sci_controller_error_isr(struct isci_host *ihost)
+{
+	u32 interrupt_status;
+
+	interrupt_status =
+		readl(&ihost->smu_registers->interrupt_status);
+	interrupt_status &= (SMU_ISR_QUEUE_ERROR | SMU_ISR_QUEUE_SUSPEND);
+
+	if (interrupt_status != 0) {
+		/*
+		 * There is an error interrupt pending so let it through and handle
+		 * in the callback */
+		return true;
+	}
+
+	/*
+	 * There is a race in the hardware that could cause us not to be notified
+	 * of an interrupt completion if we do not take this step.  We will mask
+	 * then unmask the error interrupts so if there was another interrupt
+	 * pending we will be notified.
+	 * Could we write the value of (SMU_ISR_QUEUE_ERROR | SMU_ISR_QUEUE_SUSPEND)? */
+	writel(0xff, &ihost->smu_registers->interrupt_mask);
+	writel(0, &ihost->smu_registers->interrupt_mask);
+
+	return false;
+}
+
+static void sci_controller_task_completion(struct isci_host *ihost, u32 ent)
+{
+	u32 index = SCU_GET_COMPLETION_INDEX(ent);
+	struct isci_request *ireq = ihost->reqs[index];
+
+	/* Make sure that we really want to process this IO request */
+	if (test_bit(IREQ_ACTIVE, &ireq->flags) &&
+	    ireq->io_tag != SCI_CONTROLLER_INVALID_IO_TAG &&
+	    ISCI_TAG_SEQ(ireq->io_tag) == ihost->io_request_sequence[index])
+		/* Yep this is a valid io request pass it along to the
+		 * io request handler
+		 */
+		sci_io_request_tc_completion(ireq, ent);
+}
+
+static void sci_controller_sdma_completion(struct isci_host *ihost, u32 ent)
+{
+	u32 index;
+	struct isci_request *ireq;
+	struct isci_remote_device *idev;
+
+	index = SCU_GET_COMPLETION_INDEX(ent);
+
+	switch (scu_get_command_request_type(ent)) {
+	case SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC:
+	case SCU_CONTEXT_COMMAND_REQUEST_TYPE_DUMP_TC:
+		ireq = ihost->reqs[index];
+		dev_warn(&ihost->pdev->dev, "%s: %x for io request %p\n",
+			 __func__, ent, ireq);
+		/* @todo For a post TC operation we need to fail the IO
+		 * request
+		 */
+		break;
+	case SCU_CONTEXT_COMMAND_REQUEST_TYPE_DUMP_RNC:
+	case SCU_CONTEXT_COMMAND_REQUEST_TYPE_OTHER_RNC:
+	case SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_RNC:
+		idev = ihost->device_table[index];
+		dev_warn(&ihost->pdev->dev, "%s: %x for device %p\n",
+			 __func__, ent, idev);
+		/* @todo For a port RNC operation we need to fail the
+		 * device
+		 */
+		break;
+	default:
+		dev_warn(&ihost->pdev->dev, "%s: unknown completion type %x\n",
+			 __func__, ent);
+		break;
+	}
+}
+
+static void sci_controller_unsolicited_frame(struct isci_host *ihost, u32 ent)
+{
+	u32 index;
+	u32 frame_index;
+
+	struct scu_unsolicited_frame_header *frame_header;
+	struct isci_phy *iphy;
+	struct isci_remote_device *idev;
+
+	enum sci_status result = SCI_FAILURE;
+
+	frame_index = SCU_GET_FRAME_INDEX(ent);
+
+	frame_header = ihost->uf_control.buffers.array[frame_index].header;
+	ihost->uf_control.buffers.array[frame_index].state = UNSOLICITED_FRAME_IN_USE;
+
+	if (SCU_GET_FRAME_ERROR(ent)) {
+		/*
+		 * / @todo If the IAF frame or SIGNATURE FIS frame has an error will
+		 * /       this cause a problem? We expect the phy initialization will
+		 * /       fail if there is an error in the frame. */
+		sci_controller_release_frame(ihost, frame_index);
+		return;
+	}
+
+	if (frame_header->is_address_frame) {
+		index = SCU_GET_PROTOCOL_ENGINE_INDEX(ent);
+		iphy = &ihost->phys[index];
+		result = sci_phy_frame_handler(iphy, frame_index);
+	} else {
+
+		index = SCU_GET_COMPLETION_INDEX(ent);
+
+		if (index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX) {
+			/*
+			 * This is a signature fis or a frame from a direct attached SATA
+			 * device that has not yet been created.  In either case forwared
+			 * the frame to the PE and let it take care of the frame data. */
+			index = SCU_GET_PROTOCOL_ENGINE_INDEX(ent);
+			iphy = &ihost->phys[index];
+			result = sci_phy_frame_handler(iphy, frame_index);
+		} else {
+			if (index < ihost->remote_node_entries)
+				idev = ihost->device_table[index];
+			else
+				idev = NULL;
+
+			if (idev != NULL)
+				result = sci_remote_device_frame_handler(idev, frame_index);
+			else
+				sci_controller_release_frame(ihost, frame_index);
+		}
+	}
+
+	if (result != SCI_SUCCESS) {
+		/*
+		 * / @todo Is there any reason to report some additional error message
+		 * /       when we get this failure notifiction? */
+	}
+}
+
+static void sci_controller_event_completion(struct isci_host *ihost, u32 ent)
+{
+	struct isci_remote_device *idev;
+	struct isci_request *ireq;
+	struct isci_phy *iphy;
+	u32 index;
+
+	index = SCU_GET_COMPLETION_INDEX(ent);
+
+	switch (scu_get_event_type(ent)) {
+	case SCU_EVENT_TYPE_SMU_COMMAND_ERROR:
+		/* / @todo The driver did something wrong and we need to fix the condtion. */
+		dev_err(&ihost->pdev->dev,
+			"%s: SCIC Controller 0x%p received SMU command error "
+			"0x%x\n",
+			__func__,
+			ihost,
+			ent);
+		break;
+
+	case SCU_EVENT_TYPE_SMU_PCQ_ERROR:
+	case SCU_EVENT_TYPE_SMU_ERROR:
+	case SCU_EVENT_TYPE_FATAL_MEMORY_ERROR:
+		/*
+		 * / @todo This is a hardware failure and its likely that we want to
+		 * /       reset the controller. */
+		dev_err(&ihost->pdev->dev,
+			"%s: SCIC Controller 0x%p received fatal controller "
+			"event  0x%x\n",
+			__func__,
+			ihost,
+			ent);
+		break;
+
+	case SCU_EVENT_TYPE_TRANSPORT_ERROR:
+		ireq = ihost->reqs[index];
+		sci_io_request_event_handler(ireq, ent);
+		break;
+
+	case SCU_EVENT_TYPE_PTX_SCHEDULE_EVENT:
+		switch (scu_get_event_specifier(ent)) {
+		case SCU_EVENT_SPECIFIC_SMP_RESPONSE_NO_PE:
+		case SCU_EVENT_SPECIFIC_TASK_TIMEOUT:
+			ireq = ihost->reqs[index];
+			if (ireq != NULL)
+				sci_io_request_event_handler(ireq, ent);
+			else
+				dev_warn(&ihost->pdev->dev,
+					 "%s: SCIC Controller 0x%p received "
+					 "event 0x%x for io request object "
+					 "that doesnt exist.\n",
+					 __func__,
+					 ihost,
+					 ent);
+
+			break;
+
+		case SCU_EVENT_SPECIFIC_IT_NEXUS_TIMEOUT:
+			idev = ihost->device_table[index];
+			if (idev != NULL)
+				sci_remote_device_event_handler(idev, ent);
+			else
+				dev_warn(&ihost->pdev->dev,
+					 "%s: SCIC Controller 0x%p received "
+					 "event 0x%x for remote device object "
+					 "that doesnt exist.\n",
+					 __func__,
+					 ihost,
+					 ent);
+
+			break;
+		}
+		break;
+
+	case SCU_EVENT_TYPE_BROADCAST_CHANGE:
+	/*
+	 * direct the broadcast change event to the phy first and then let
+	 * the phy redirect the broadcast change to the port object */
+	case SCU_EVENT_TYPE_ERR_CNT_EVENT:
+	/*
+	 * direct error counter event to the phy object since that is where
+	 * we get the event notification.  This is a type 4 event. */
+	case SCU_EVENT_TYPE_OSSP_EVENT:
+		index = SCU_GET_PROTOCOL_ENGINE_INDEX(ent);
+		iphy = &ihost->phys[index];
+		sci_phy_event_handler(iphy, ent);
+		break;
+
+	case SCU_EVENT_TYPE_RNC_SUSPEND_TX:
+	case SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX:
+	case SCU_EVENT_TYPE_RNC_OPS_MISC:
+		if (index < ihost->remote_node_entries) {
+			idev = ihost->device_table[index];
+
+			if (idev != NULL)
+				sci_remote_device_event_handler(idev, ent);
+		} else
+			dev_err(&ihost->pdev->dev,
+				"%s: SCIC Controller 0x%p received event 0x%x "
+				"for remote device object 0x%0x that doesnt "
+				"exist.\n",
+				__func__,
+				ihost,
+				ent,
+				index);
+
+		break;
+
+	default:
+		dev_warn(&ihost->pdev->dev,
+			 "%s: SCIC Controller received unknown event code %x\n",
+			 __func__,
+			 ent);
+		break;
+	}
+}
+
+static void sci_controller_process_completions(struct isci_host *ihost)
+{
+	u32 completion_count = 0;
+	u32 ent;
+	u32 get_index;
+	u32 get_cycle;
+	u32 event_get;
+	u32 event_cycle;
+
+	dev_dbg(&ihost->pdev->dev,
+		"%s: completion queue begining get:0x%08x\n",
+		__func__,
+		ihost->completion_queue_get);
+
+	/* Get the component parts of the completion queue */
+	get_index = NORMALIZE_GET_POINTER(ihost->completion_queue_get);
+	get_cycle = SMU_CQGR_CYCLE_BIT & ihost->completion_queue_get;
+
+	event_get = NORMALIZE_EVENT_POINTER(ihost->completion_queue_get);
+	event_cycle = SMU_CQGR_EVENT_CYCLE_BIT & ihost->completion_queue_get;
+
+	while (
+		NORMALIZE_GET_POINTER_CYCLE_BIT(get_cycle)
+		== COMPLETION_QUEUE_CYCLE_BIT(ihost->completion_queue[get_index])
+		) {
+		completion_count++;
+
+		ent = ihost->completion_queue[get_index];
+
+		/* increment the get pointer and check for rollover to toggle the cycle bit */
+		get_cycle ^= ((get_index+1) & SCU_MAX_COMPLETION_QUEUE_ENTRIES) <<
+			     (SMU_COMPLETION_QUEUE_GET_CYCLE_BIT_SHIFT - SCU_MAX_COMPLETION_QUEUE_SHIFT);
+		get_index = (get_index+1) & (SCU_MAX_COMPLETION_QUEUE_ENTRIES-1);
+
+		dev_dbg(&ihost->pdev->dev,
+			"%s: completion queue entry:0x%08x\n",
+			__func__,
+			ent);
+
+		switch (SCU_GET_COMPLETION_TYPE(ent)) {
+		case SCU_COMPLETION_TYPE_TASK:
+			sci_controller_task_completion(ihost, ent);
+			break;
+
+		case SCU_COMPLETION_TYPE_SDMA:
+			sci_controller_sdma_completion(ihost, ent);
+			break;
+
+		case SCU_COMPLETION_TYPE_UFI:
+			sci_controller_unsolicited_frame(ihost, ent);
+			break;
+
+		case SCU_COMPLETION_TYPE_EVENT:
+		case SCU_COMPLETION_TYPE_NOTIFY: {
+			event_cycle ^= ((event_get+1) & SCU_MAX_EVENTS) <<
+				       (SMU_COMPLETION_QUEUE_GET_EVENT_CYCLE_BIT_SHIFT - SCU_MAX_EVENTS_SHIFT);
+			event_get = (event_get+1) & (SCU_MAX_EVENTS-1);
+
+			sci_controller_event_completion(ihost, ent);
+			break;
+		}
+		default:
+			dev_warn(&ihost->pdev->dev,
+				 "%s: SCIC Controller received unknown "
+				 "completion type %x\n",
+				 __func__,
+				 ent);
+			break;
+		}
+	}
+
+	/* Update the get register if we completed one or more entries */
+	if (completion_count > 0) {
+		ihost->completion_queue_get =
+			SMU_CQGR_GEN_BIT(ENABLE) |
+			SMU_CQGR_GEN_BIT(EVENT_ENABLE) |
+			event_cycle |
+			SMU_CQGR_GEN_VAL(EVENT_POINTER, event_get) |
+			get_cycle |
+			SMU_CQGR_GEN_VAL(POINTER, get_index);
+
+		writel(ihost->completion_queue_get,
+		       &ihost->smu_registers->completion_queue_get);
+
+	}
+
+	dev_dbg(&ihost->pdev->dev,
+		"%s: completion queue ending get:0x%08x\n",
+		__func__,
+		ihost->completion_queue_get);
+
+}
+
+static void sci_controller_error_handler(struct isci_host *ihost)
+{
+	u32 interrupt_status;
+
+	interrupt_status =
+		readl(&ihost->smu_registers->interrupt_status);
+
+	if ((interrupt_status & SMU_ISR_QUEUE_SUSPEND) &&
+	    sci_controller_completion_queue_has_entries(ihost)) {
+
+		sci_controller_process_completions(ihost);
+		writel(SMU_ISR_QUEUE_SUSPEND, &ihost->smu_registers->interrupt_status);
+	} else {
+		dev_err(&ihost->pdev->dev, "%s: status: %#x\n", __func__,
+			interrupt_status);
+
+		sci_change_state(&ihost->sm, SCIC_FAILED);
+
+		return;
+	}
+
+	/* If we dont process any completions I am not sure that we want to do this.
+	 * We are in the middle of a hardware fault and should probably be reset.
+	 */
+	writel(0, &ihost->smu_registers->interrupt_mask);
+}
+
+irqreturn_t isci_intx_isr(int vec, void *data)
+{
+	irqreturn_t ret = IRQ_NONE;
+	struct isci_host *ihost = data;
+
+	if (sci_controller_isr(ihost)) {
+		writel(SMU_ISR_COMPLETION, &ihost->smu_registers->interrupt_status);
+		tasklet_schedule(&ihost->completion_tasklet);
+		ret = IRQ_HANDLED;
+	} else if (sci_controller_error_isr(ihost)) {
+		spin_lock(&ihost->scic_lock);
+		sci_controller_error_handler(ihost);
+		spin_unlock(&ihost->scic_lock);
+		ret = IRQ_HANDLED;
+	}
+
+	return ret;
+}
+
+irqreturn_t isci_error_isr(int vec, void *data)
+{
+	struct isci_host *ihost = data;
+
+	if (sci_controller_error_isr(ihost))
+		sci_controller_error_handler(ihost);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * isci_host_start_complete() - This function is called by the core library,
+ *    through the ISCI Module, to indicate controller start status.
+ * @isci_host: This parameter specifies the ISCI host object
+ * @completion_status: This parameter specifies the completion status from the
+ *    core library.
+ *
+ */
+static void isci_host_start_complete(struct isci_host *ihost, enum sci_status completion_status)
+{
+	if (completion_status != SCI_SUCCESS)
+		dev_info(&ihost->pdev->dev,
+			"controller start timed out, continuing...\n");
+	isci_host_change_state(ihost, isci_ready);
+	clear_bit(IHOST_START_PENDING, &ihost->flags);
+	wake_up(&ihost->eventq);
+}
+
+int isci_host_scan_finished(struct Scsi_Host *shost, unsigned long time)
+{
+	struct isci_host *ihost = SHOST_TO_SAS_HA(shost)->lldd_ha;
+
+	if (test_bit(IHOST_START_PENDING, &ihost->flags))
+		return 0;
+
+	/* todo: use sas_flush_discovery once it is upstream */
+	scsi_flush_work(shost);
+
+	scsi_flush_work(shost);
+
+	dev_dbg(&ihost->pdev->dev,
+		"%s: ihost->status = %d, time = %ld\n",
+		 __func__, isci_host_get_state(ihost), time);
+
+	return 1;
+
+}
+
+/**
+ * sci_controller_get_suggested_start_timeout() - This method returns the
+ *    suggested sci_controller_start() timeout amount.  The user is free to
+ *    use any timeout value, but this method provides the suggested minimum
+ *    start timeout value.  The returned value is based upon empirical
+ *    information determined as a result of interoperability testing.
+ * @controller: the handle to the controller object for which to return the
+ *    suggested start timeout.
+ *
+ * This method returns the number of milliseconds for the suggested start
+ * operation timeout.
+ */
+static u32 sci_controller_get_suggested_start_timeout(struct isci_host *ihost)
+{
+	/* Validate the user supplied parameters. */
+	if (!ihost)
+		return 0;
+
+	/*
+	 * The suggested minimum timeout value for a controller start operation:
+	 *
+	 *     Signature FIS Timeout
+	 *   + Phy Start Timeout
+	 *   + Number of Phy Spin Up Intervals
+	 *   ---------------------------------
+	 *   Number of milliseconds for the controller start operation.
+	 *
+	 * NOTE: The number of phy spin up intervals will be equivalent
+	 *       to the number of phys divided by the number phys allowed
+	 *       per interval - 1 (once OEM parameters are supported).
+	 *       Currently we assume only 1 phy per interval. */
+
+	return SCIC_SDS_SIGNATURE_FIS_TIMEOUT
+		+ SCIC_SDS_CONTROLLER_PHY_START_TIMEOUT
+		+ ((SCI_MAX_PHYS - 1) * SCIC_SDS_CONTROLLER_POWER_CONTROL_INTERVAL);
+}
+
+static void sci_controller_enable_interrupts(struct isci_host *ihost)
+{
+	BUG_ON(ihost->smu_registers == NULL);
+	writel(0, &ihost->smu_registers->interrupt_mask);
+}
+
+void sci_controller_disable_interrupts(struct isci_host *ihost)
+{
+	BUG_ON(ihost->smu_registers == NULL);
+	writel(0xffffffff, &ihost->smu_registers->interrupt_mask);
+}
+
+static void sci_controller_enable_port_task_scheduler(struct isci_host *ihost)
+{
+	u32 port_task_scheduler_value;
+
+	port_task_scheduler_value =
+		readl(&ihost->scu_registers->peg0.ptsg.control);
+	port_task_scheduler_value |=
+		(SCU_PTSGCR_GEN_BIT(ETM_ENABLE) |
+		 SCU_PTSGCR_GEN_BIT(PTSG_ENABLE));
+	writel(port_task_scheduler_value,
+	       &ihost->scu_registers->peg0.ptsg.control);
+}
+
+static void sci_controller_assign_task_entries(struct isci_host *ihost)
+{
+	u32 task_assignment;
+
+	/*
+	 * Assign all the TCs to function 0
+	 * TODO: Do we actually need to read this register to write it back?
+	 */
+
+	task_assignment =
+		readl(&ihost->smu_registers->task_context_assignment[0]);
+
+	task_assignment |= (SMU_TCA_GEN_VAL(STARTING, 0)) |
+		(SMU_TCA_GEN_VAL(ENDING,  ihost->task_context_entries - 1)) |
+		(SMU_TCA_GEN_BIT(RANGE_CHECK_ENABLE));
+
+	writel(task_assignment,
+		&ihost->smu_registers->task_context_assignment[0]);
+
+}
+
+static void sci_controller_initialize_completion_queue(struct isci_host *ihost)
+{
+	u32 index;
+	u32 completion_queue_control_value;
+	u32 completion_queue_get_value;
+	u32 completion_queue_put_value;
+
+	ihost->completion_queue_get = 0;
+
+	completion_queue_control_value =
+		(SMU_CQC_QUEUE_LIMIT_SET(SCU_MAX_COMPLETION_QUEUE_ENTRIES - 1) |
+		 SMU_CQC_EVENT_LIMIT_SET(SCU_MAX_EVENTS - 1));
+
+	writel(completion_queue_control_value,
+	       &ihost->smu_registers->completion_queue_control);
+
+
+	/* Set the completion queue get pointer and enable the queue */
+	completion_queue_get_value = (
+		(SMU_CQGR_GEN_VAL(POINTER, 0))
+		| (SMU_CQGR_GEN_VAL(EVENT_POINTER, 0))
+		| (SMU_CQGR_GEN_BIT(ENABLE))
+		| (SMU_CQGR_GEN_BIT(EVENT_ENABLE))
+		);
+
+	writel(completion_queue_get_value,
+	       &ihost->smu_registers->completion_queue_get);
+
+	/* Set the completion queue put pointer */
+	completion_queue_put_value = (
+		(SMU_CQPR_GEN_VAL(POINTER, 0))
+		| (SMU_CQPR_GEN_VAL(EVENT_POINTER, 0))
+		);
+
+	writel(completion_queue_put_value,
+	       &ihost->smu_registers->completion_queue_put);
+
+	/* Initialize the cycle bit of the completion queue entries */
+	for (index = 0; index < SCU_MAX_COMPLETION_QUEUE_ENTRIES; index++) {
+		/*
+		 * If get.cycle_bit != completion_queue.cycle_bit
+		 * its not a valid completion queue entry
+		 * so at system start all entries are invalid */
+		ihost->completion_queue[index] = 0x80000000;
+	}
+}
+
+static void sci_controller_initialize_unsolicited_frame_queue(struct isci_host *ihost)
+{
+	u32 frame_queue_control_value;
+	u32 frame_queue_get_value;
+	u32 frame_queue_put_value;
+
+	/* Write the queue size */
+	frame_queue_control_value =
+		SCU_UFQC_GEN_VAL(QUEUE_SIZE, SCU_MAX_UNSOLICITED_FRAMES);
+
+	writel(frame_queue_control_value,
+	       &ihost->scu_registers->sdma.unsolicited_frame_queue_control);
+
+	/* Setup the get pointer for the unsolicited frame queue */
+	frame_queue_get_value = (
+		SCU_UFQGP_GEN_VAL(POINTER, 0)
+		|  SCU_UFQGP_GEN_BIT(ENABLE_BIT)
+		);
+
+	writel(frame_queue_get_value,
+	       &ihost->scu_registers->sdma.unsolicited_frame_get_pointer);
+	/* Setup the put pointer for the unsolicited frame queue */
+	frame_queue_put_value = SCU_UFQPP_GEN_VAL(POINTER, 0);
+	writel(frame_queue_put_value,
+	       &ihost->scu_registers->sdma.unsolicited_frame_put_pointer);
+}
+
+static void sci_controller_transition_to_ready(struct isci_host *ihost, enum sci_status status)
+{
+	if (ihost->sm.current_state_id == SCIC_STARTING) {
+		/*
+		 * We move into the ready state, because some of the phys/ports
+		 * may be up and operational.
+		 */
+		sci_change_state(&ihost->sm, SCIC_READY);
+
+		isci_host_start_complete(ihost, status);
+	}
+}
+
+static bool is_phy_starting(struct isci_phy *iphy)
+{
+	enum sci_phy_states state;
+
+	state = iphy->sm.current_state_id;
+	switch (state) {
+	case SCI_PHY_STARTING:
+	case SCI_PHY_SUB_INITIAL:
+	case SCI_PHY_SUB_AWAIT_SAS_SPEED_EN:
+	case SCI_PHY_SUB_AWAIT_IAF_UF:
+	case SCI_PHY_SUB_AWAIT_SAS_POWER:
+	case SCI_PHY_SUB_AWAIT_SATA_POWER:
+	case SCI_PHY_SUB_AWAIT_SATA_PHY_EN:
+	case SCI_PHY_SUB_AWAIT_SATA_SPEED_EN:
+	case SCI_PHY_SUB_AWAIT_SIG_FIS_UF:
+	case SCI_PHY_SUB_FINAL:
+		return true;
+	default:
+		return false;
+	}
+}
+
+/**
+ * sci_controller_start_next_phy - start phy
+ * @scic: controller
+ *
+ * If all the phys have been started, then attempt to transition the
+ * controller to the READY state and inform the user
+ * (sci_cb_controller_start_complete()).
+ */
+static enum sci_status sci_controller_start_next_phy(struct isci_host *ihost)
+{
+	struct sci_oem_params *oem = &ihost->oem_parameters;
+	struct isci_phy *iphy;
+	enum sci_status status;
+
+	status = SCI_SUCCESS;
+
+	if (ihost->phy_startup_timer_pending)
+		return status;
+
+	if (ihost->next_phy_to_start >= SCI_MAX_PHYS) {
+		bool is_controller_start_complete = true;
+		u32 state;
+		u8 index;
+
+		for (index = 0; index < SCI_MAX_PHYS; index++) {
+			iphy = &ihost->phys[index];
+			state = iphy->sm.current_state_id;
+
+			if (!phy_get_non_dummy_port(iphy))
+				continue;
+
+			/* The controller start operation is complete iff:
+			 * - all links have been given an opportunity to start
+			 * - have no indication of a connected device
+			 * - have an indication of a connected device and it has
+			 *   finished the link training process.
+			 */
+			if ((iphy->is_in_link_training == false && state == SCI_PHY_INITIAL) ||
+			    (iphy->is_in_link_training == false && state == SCI_PHY_STOPPED) ||
+			    (iphy->is_in_link_training == true && is_phy_starting(iphy))) {
+				is_controller_start_complete = false;
+				break;
+			}
+		}
+
+		/*
+		 * The controller has successfully finished the start process.
+		 * Inform the SCI Core user and transition to the READY state. */
+		if (is_controller_start_complete == true) {
+			sci_controller_transition_to_ready(ihost, SCI_SUCCESS);
+			sci_del_timer(&ihost->phy_timer);
+			ihost->phy_startup_timer_pending = false;
+		}
+	} else {
+		iphy = &ihost->phys[ihost->next_phy_to_start];
+
+		if (oem->controller.mode_type == SCIC_PORT_MANUAL_CONFIGURATION_MODE) {
+			if (phy_get_non_dummy_port(iphy) == NULL) {
+				ihost->next_phy_to_start++;
+
+				/* Caution recursion ahead be forwarned
+				 *
+				 * The PHY was never added to a PORT in MPC mode
+				 * so start the next phy in sequence This phy
+				 * will never go link up and will not draw power
+				 * the OEM parameters either configured the phy
+				 * incorrectly for the PORT or it was never
+				 * assigned to a PORT
+				 */
+				return sci_controller_start_next_phy(ihost);
+			}
+		}
+
+		status = sci_phy_start(iphy);
+
+		if (status == SCI_SUCCESS) {
+			sci_mod_timer(&ihost->phy_timer,
+				      SCIC_SDS_CONTROLLER_PHY_START_TIMEOUT);
+			ihost->phy_startup_timer_pending = true;
+		} else {
+			dev_warn(&ihost->pdev->dev,
+				 "%s: Controller stop operation failed "
+				 "to stop phy %d because of status "
+				 "%d.\n",
+				 __func__,
+				 ihost->phys[ihost->next_phy_to_start].phy_index,
+				 status);
+		}
+
+		ihost->next_phy_to_start++;
+	}
+
+	return status;
+}
+
+static void phy_startup_timeout(unsigned long data)
+{
+	struct sci_timer *tmr = (struct sci_timer *)data;
+	struct isci_host *ihost = container_of(tmr, typeof(*ihost), phy_timer);
+	unsigned long flags;
+	enum sci_status status;
+
+	spin_lock_irqsave(&ihost->scic_lock, flags);
+
+	if (tmr->cancel)
+		goto done;
+
+	ihost->phy_startup_timer_pending = false;
+
+	do {
+		status = sci_controller_start_next_phy(ihost);
+	} while (status != SCI_SUCCESS);
+
+done:
+	spin_unlock_irqrestore(&ihost->scic_lock, flags);
+}
+
+static u16 isci_tci_active(struct isci_host *ihost)
+{
+	return CIRC_CNT(ihost->tci_head, ihost->tci_tail, SCI_MAX_IO_REQUESTS);
+}
+
+static enum sci_status sci_controller_start(struct isci_host *ihost,
+					     u32 timeout)
+{
+	enum sci_status result;
+	u16 index;
+
+	if (ihost->sm.current_state_id != SCIC_INITIALIZED) {
+		dev_warn(&ihost->pdev->dev,
+			 "SCIC Controller start operation requested in "
+			 "invalid state\n");
+		return SCI_FAILURE_INVALID_STATE;
+	}
+
+	/* Build the TCi free pool */
+	BUILD_BUG_ON(SCI_MAX_IO_REQUESTS > 1 << sizeof(ihost->tci_pool[0]) * 8);
+	ihost->tci_head = 0;
+	ihost->tci_tail = 0;
+	for (index = 0; index < ihost->task_context_entries; index++)
+		isci_tci_free(ihost, index);
+
+	/* Build the RNi free pool */
+	sci_remote_node_table_initialize(&ihost->available_remote_nodes,
+					 ihost->remote_node_entries);
+
+	/*
+	 * Before anything else lets make sure we will not be
+	 * interrupted by the hardware.
+	 */
+	sci_controller_disable_interrupts(ihost);
+
+	/* Enable the port task scheduler */
+	sci_controller_enable_port_task_scheduler(ihost);
+
+	/* Assign all the task entries to ihost physical function */
+	sci_controller_assign_task_entries(ihost);
+
+	/* Now initialize the completion queue */
+	sci_controller_initialize_completion_queue(ihost);
+
+	/* Initialize the unsolicited frame queue for use */
+	sci_controller_initialize_unsolicited_frame_queue(ihost);
+
+	/* Start all of the ports on this controller */
+	for (index = 0; index < ihost->logical_port_entries; index++) {
+		struct isci_port *iport = &ihost->ports[index];
+
+		result = sci_port_start(iport);
+		if (result)
+			return result;
+	}
+
+	sci_controller_start_next_phy(ihost);
+
+	sci_mod_timer(&ihost->timer, timeout);
+
+	sci_change_state(&ihost->sm, SCIC_STARTING);
+
+	return SCI_SUCCESS;
+}
+
+void isci_host_scan_start(struct Scsi_Host *shost)
+{
+	struct isci_host *ihost = SHOST_TO_SAS_HA(shost)->lldd_ha;
+	unsigned long tmo = sci_controller_get_suggested_start_timeout(ihost);
+
+	set_bit(IHOST_START_PENDING, &ihost->flags);
+
+	spin_lock_irq(&ihost->scic_lock);
+	sci_controller_start(ihost, tmo);
+	sci_controller_enable_interrupts(ihost);
+	spin_unlock_irq(&ihost->scic_lock);
+}
+
+static void isci_host_stop_complete(struct isci_host *ihost, enum sci_status completion_status)
+{
+	isci_host_change_state(ihost, isci_stopped);
+	sci_controller_disable_interrupts(ihost);
+	clear_bit(IHOST_STOP_PENDING, &ihost->flags);
+	wake_up(&ihost->eventq);
+}
+
+static void sci_controller_completion_handler(struct isci_host *ihost)
+{
+	/* Empty out the completion queue */
+	if (sci_controller_completion_queue_has_entries(ihost))
+		sci_controller_process_completions(ihost);
+
+	/* Clear the interrupt and enable all interrupts again */
+	writel(SMU_ISR_COMPLETION, &ihost->smu_registers->interrupt_status);
+	/* Could we write the value of SMU_ISR_COMPLETION? */
+	writel(0xFF000000, &ihost->smu_registers->interrupt_mask);
+	writel(0, &ihost->smu_registers->interrupt_mask);
+}
+
+/**
+ * isci_host_completion_routine() - This function is the delayed service
+ *    routine that calls the sci core library's completion handler. It's
+ *    scheduled as a tasklet from the interrupt service routine when interrupts
+ *    in use, or set as the timeout function in polled mode.
+ * @data: This parameter specifies the ISCI host object
+ *
+ */
+stat