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Diffstat (limited to 'drivers/scsi/isci/host.c')
| -rw-r--r-- | drivers/scsi/isci/host.c | 2807 |
1 files changed, 2807 insertions, 0 deletions
diff --git a/drivers/scsi/isci/host.c b/drivers/scsi/isci/host.c new file mode 100644 index 000000000..609dafd66 --- /dev/null +++ b/drivers/scsi/isci/host.c @@ -0,0 +1,2807 @@ +/* + * 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 "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; + + /* we have a spurious interrupt it could be that we have already + * emptied the completion queue from a previous interrupt + * FIXME: really!? + */ + 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. + */ + spin_lock(&ihost->scic_lock); + if (test_bit(IHOST_IRQ_ENABLED, &ihost->flags)) { + writel(0xFF000000, &ihost->smu_registers->interrupt_mask); + writel(0, &ihost->smu_registers->interrupt_mask); + } + spin_unlock(&ihost->scic_lock); + + 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 beginning 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: + sci_controller_event_completion(ihost, ent); + break; + + 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"); + clear_bit(IHOST_START_PENDING, &ihost->flags); + wake_up(&ihost->eventq); +} + +int isci_host_scan_finished(struct Scsi_Host *shost, unsigned long time) +{ + struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); + struct isci_host *ihost = ha->lldd_ha; + + if (test_bit(IHOST_START_PENDING, &ihost->flags)) + return 0; + + sas_drain_work(ha); + + 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) +{ + set_bit(IHOST_IRQ_ENABLED, &ihost->flags); + writel(0, &ihost->smu_registers->interrupt_mask); +} + +void sci_controller_disable_interrupts(struct isci_host *ihost) +{ + clear_bit(IHOST_IRQ_ENABLED, &ihost->flags); + writel(0xffffffff, &ihost->smu_registers->interrupt_mask); + readl(&ihost->smu_registers->interrupt_mask); /* flush */ +} + +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); +} + +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_OSSP_EN: + case SCI_PHY_SUB_AWAIT_SIG_FIS_UF: + case SCI_PHY_SUB_FINAL: + return true; + default: + return false; + } +} + +bool is_controller_start_complete(struct isci_host *ihost) +{ + int i; + + for (i = 0; i < SCI_MAX_PHYS; i++) { + struct isci_phy *iphy = &ihost->phys[i]; + u32 state = iphy->sm.current_state_id; + + /* in apc mode we need to check every phy, in + * mpc mode we only need to check phys that have + * been configured into a port + */ + if (is_port_config_apc(ihost)) + /* pass */; + else 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)) || + (ihost->port_agent.phy_ready_mask != ihost->port_agent.phy_configured_mask)) + return false; + } + + return true; +} + +/** + * 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) { + if (is_controller_start_complete(ihost)) { + 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, "%s invalid state: %d\n", + __func__, ihost->sm.current_state_id); + 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_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) +{ + 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); +} + +void ireq_done(struct isci_host *ihost, struct isci_request *ireq, struct sas_task *task) +{ + if (!test_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags) && + !(task->task_state_flags & SAS_TASK_STATE_ABORTED)) { + if (test_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags)) { + /* Normal notification (task_done) */ + dev_dbg(&ihost->pdev->dev, + "%s: Normal - ireq/task = %p/%p\n", + __func__, ireq, task); + task->lldd_task = NULL; + task->task_done(task); + } else { + dev_dbg(&ihost->pdev->dev, + "%s: Error - ireq/task = %p/%p\n", + __func__, ireq, task); + if (sas_protocol_ata(task->task_proto)) + task->lldd_task = NULL; + sas_task_abort(task); + } + } else + task->lldd_task = NULL; + + if (test_and_clear_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags)) + wake_up_all(&ihost->eventq); + + if (!test_bit(IREQ_NO_AUTO_FREE_TAG, &ireq->flags)) + isci_free_tag(ihost, ireq->io_tag); +} +/** + * 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 + * + */ +void isci_host_completion_routine(unsigned long data) +{ + struct isci_host *ihost = (struct isci_host *)data; + u16 active; + + spin_lock_irq(&ihost->scic_lock); + sci_controller_completion_handler(ihost); + spin_unlock_irq(&ihost->scic_lock); + + /* + * we subtract SCI_MAX_PORTS to account for the number of dummy TCs + * issued for hardware issue workaround + */ + active = isci_tci_active(ihost) - SCI_MAX_PORTS; + + /* + * the coalesence timeout doubles at each encoding step, so + * update it based on the ilog2 value of the outstanding requests + */ + writel(SMU_ICC_GEN_VAL(NUMBER, active) | + SMU_ICC_GEN_VAL(TIMER, ISCI_COALESCE_BASE + ilog2(active)), + &ihost->smu_registers->interrupt_coalesce_control); +} + +/** + * sci_controller_stop() - This method will stop an individual controller + * object.This method will invoke the associated user callback upon + * completion. The completion callback is called when the following + * conditions are met: -# the method return status is SCI_SUCCESS. -# the + * controller has been quiesced. This method will ensure that all IO + * requests are quiesced, phys are stopped, and all additional operation by + * the hardware is halted. + * @controller: the handle to the controller object to stop. + * @timeout: This parameter specifies the number of milliseconds in which the + * stop operation should complete. + * + * The controller must be in the STARTED or STOPPED state. Indicate if the + * controller stop method succeeded or failed in some way. SCI_SUCCESS if the + * stop operation successfully began. SCI_WARNING_ALREADY_IN_STATE if the + * controller is already in the STOPPED state. SCI_FAILURE_INVALID_STATE if the + * controller is not either in the STARTED or STOPPED states. + */ +static enum sci_status sci_controller_stop(struct isci_host *ihost, u32 timeout) +{ + if (ihost->sm.current_state_id != SCIC_READY) { + dev_warn(&ihost->pdev->dev, "%s invalid state: %d\n", + __func__, ihost->sm.current_state_id); + return SCI_FAILURE_INVALID_STATE; + } + + sci_mod_timer(&ihost->timer, timeout); + sci_change_state(&ihost->sm, SCIC_STOPPING); + return SCI_SUCCESS; +} + +/** + * sci_controller_reset() - This method will reset the supplied core + * controller regardless of the state of said controller. This operation is + * considered destructive. In other words, all current operations are wiped + * out. No IO completions for outstanding devices occur. Outstanding IO + * requests are not aborted or completed at the actual remote device. + * @controller: the handle to the controller object to reset. + * + * Indicate if the controller reset method succeeded or failed in some way. + * SCI_SUCCESS if the reset operation successfully started. SCI_FATAL_ERROR if + * the controller reset operation is unable to complete. + */ +static enum sci_status sci_controller_reset(struct isci_host *ihost) +{ + switch (ihost->sm.current_state_id) { + case SCIC_RESET: + case SCIC_READY: + case SCIC_STOPPING: + case SCIC_FAILED: + /* + * The reset operation is not a graceful cleanup, just + * perform the state transition. + */ + sci_change_state(&ihost->sm, SCIC_RESETTING); + return SCI_SUCCESS; + default: + dev_warn(&ihost->pdev->dev, "%s invalid state: %d\n", + __func__, ihost->sm.current_state_id); + return SCI_FAILURE_INVALID_STATE; + } +} + +static enum sci_status sci_controller_stop_phys(struct isci_host *ihost) +{ + u32 index; + enum sci_status status; + enum sci_status phy_status; + + status = SCI_SUCCESS; + + for (index = 0; index < SCI_MAX_PHYS; index++) { + phy_status = sci_phy_stop(&ihost->phys[index]); + + if (phy_status != SCI_SUCCESS && + phy_status != SCI_FAILURE_INVALID_STATE) { + status = SCI_FAILURE; + + dev_warn(&ihost->pdev->dev, + "%s: Controller stop operation failed to stop " + "phy %d because of status %d.\n", + __func__, + ihost->phys[index].phy_index, phy_status); + } + } + + return status; +} + + +/** + * isci_host_deinit - shutdown frame reception and dma + * @ihost: host to take down + * + * This is called in either the driver shutdown or the suspend path. In + * the shutdown case libsas went through port teardown and normal device + * removal (i.e. physical links stayed up to service scsi_device removal + * commands). In the suspend case we disable the hardware without + * notifying libsas of the link down events since we want libsas to + * remember the domain across the suspend/resume cycle + */ +void isci_host_deinit(struct isci_host *ihost) +{ + int i; + + /* disable output data selects */ + for (i = 0; i < isci_gpio_count(ihost); i++) + writel(SGPIO_HW_CONTROL, &ihost->scu_registers->peg0.sgpio.output_data_select[i]); + + set_bit(IHOST_STOP_PENDING, &ihost->flags); + + spin_lock_irq(&ihost->scic_lock); + sci_controller_stop(ihost, SCIC_CONTROLLER_STOP_TIMEOUT); + spin_unlock_irq(&ihost->scic_lock); + + wait_for_stop(ihost); + + /* phy stop is after controller stop to allow port and device to + * go idle before shutting down the phys, but the expectation is + * that i/o has been shut off well before we reach this + * function. + */ + sci_controller_stop_phys(ihost); + + /* disable sgpio: where the above wait should give time for the + * enclosure to sample the gpios going inactive + */ + writel(0, &ihost->scu_registers->peg0.sgpio.interface_control); + + spin_lock_irq(&ihost->scic_lock); + sci_controller_reset(ihost); + spin_unlock_irq(&ihost->scic_lock); + + /* Cancel any/all outstanding port timers */ + for (i = 0; i < ihost->logical_port_entries; i++) { + struct isci_port *iport = &ihost->ports[i]; + del_timer_sync(&iport->timer.timer); + } + + /* Cancel any/all outstanding phy timers */ + for (i = 0; i < SCI_MAX_PHYS; i++) { + struct isci_phy *iphy = &ihost->phys[i]; + del_timer_sync(&iphy->sata_timer.timer); + } + + del_timer_sync(&ihost->port_agent.timer.timer); + + del_timer_sync(&ihost->power_control.timer.timer); + + del_timer_sync(&ihost->timer.timer); + + del_timer_sync(&ihost->phy_timer.timer); +} + +static void __iomem *scu_base(struct isci_host *isci_host) +{ + struct pci_dev *pdev = isci_host->pdev; + int id = isci_host->id; + + return pcim_iomap_table(pdev)[SCI_SCU_BAR * 2] + SCI_SCU_BAR_SIZE * id; +} + +static void __iomem *smu_base(struct isci_host *isci_host) +{ + struct pci_dev *pdev = isci_host->pdev; + int id = isci_host->id; + + return pcim_iomap_table(pdev)[SCI_SMU_BAR * 2] + SCI_SMU_BAR_SIZE * id; +} + +static void sci_controller_initial_state_enter(struct sci_base_state_machine *sm) +{ + struct isci_host *ihost = container_of(sm, typeof(*ihost), sm); + + sci_change_state(&ihost->sm, SCIC_RESET); +} + +static inline void sci_controller_starting_state_exit(struct sci_base_state_machine *sm) +{ + struct isci_host *ihost = container_of(sm, typeof(*ihost), sm); + + sci_del_timer(&ihost->timer); +} + +#define INTERRUPT_COALESCE_TIMEOUT_BASE_RANGE_LOWER_BOUND_NS 853 +#define INTERRUPT_COALESCE_TIMEOUT_BASE_RANGE_UPPER_BOUND_NS 1280 +#define INTERRUPT_COALESCE_TIMEOUT_MAX_US 2700000 +#define INTERRUPT_COALESCE_NUMBER_MAX 256 +#define INTERRUPT_COALESCE_TIMEOUT_ENCODE_MIN 7 +#define INTERRUPT_COALESCE_TIMEOUT_ENCODE_MAX 28 + +/** + * sci_controller_set_interrupt_coalescence() - This method allows the user to + * configure the interrupt coalescence. + * @controller: This parameter represents the handle to the controller object + * for which its interrupt coalesce register is overridden. + * @coalesce_number: Used to control the number of entries in the Completion + * Queue before an interrupt is generated. If the number of entries exceed + * this number, an interrupt will be generated. The valid range of the input + * is [0, 256]. A setting of 0 results in coalescing being disabled. + * @coalesce_timeout: Timeout value in microseconds. The valid range of the + * input is [0, 2700000] . A setting of 0 is allowed and results in no + * interrupt coalescing timeout. + * + * Indicate if the user successfully set the interrupt coalesce parameters. + * SCI_SUCCESS The user successfully updated the interrutp coalescence. + * SCI_FAILURE_INVALID_PARAMETER_VALUE The user input value is out of range. + */ +static enum sci_status +sci_controller_set_interrupt_coalescence(struct isci_host *ihost, + u32 coalesce_number, + u32 coalesce_timeout) +{ + u8 timeout_encode = 0; + u32 min = 0; + u32 max = 0; + + /* Check if the input parameters fall in the range. */ + if (coalesce_number > INTERRUPT_COALESCE_NUMBER_MAX) + return SCI_FAILURE_INVALID_PARAMETER_VALUE; + + /* + * Defined encoding for interrupt coalescing timeout: + * Value Min Max Units + * ----- --- --- ----- + * 0 - - Disabled + * 1 13.3 20.0 ns + * 2 26.7 40.0 + * 3 53.3 80.0 + * 4 106.7 160.0 + * 5 213.3 320.0 + * 6 426.7 640.0 + * 7 853.3 1280.0 + * 8 1.7 2.6 us + * 9 3.4 5.1 + * 10 6.8 10.2 + * 11 13.7 20.5 + * 12 27.3 41.0 + * 13 54.6 81.9 + * 14 109.2 163.8 + * 15 218.5 327.7 + * 16 436.9 655.4 + * 17 873.8 1310.7 + * 18 1.7 2.6 ms + * 19 3.5 5.2 + * 20 7.0 10.5 + * 21 14.0 21.0 + * 22 28.0 41.9 + * 23 55.9 83.9 + * 24 111.8 167.8 + * 25 223.7 335.5 + * 26 447.4 671.1 + * 27 894.8 1342.2 + * 28 1.8 2.7 s + * Others Undefined */ + + /* + * Use the table above to decide the encode of interrupt coalescing timeout + * value for register writing. */ + if (coalesce_timeout == 0) + timeout_encode = 0; + else{ + /* make the timeout value in unit of (10 ns). */ + coalesce_timeout = coalesce_timeout * 100; + min = INTERRUPT_COALESCE_TIMEOUT_BASE_RANGE_LOWER_BOUND_NS / 10; + max = INTERRUPT_COALESCE_TIMEOUT_BASE_RANGE_UPPER_BOUND_NS / 10; + + /* get the encode of timeout for register writing. */ + for (timeout_encode = INTERRUPT_COALESCE_TIMEOUT_ENCODE_MIN; + timeout_encode <= INTERRUPT_COALESCE_TIMEOUT_ENCODE_MAX; + timeout_encode++) { + if (min <= coalesce_timeout && max > coalesce_timeout) + break; + else if (coalesce_timeout >= max && coalesce_timeout < min * 2 + && coalesce_timeout <= INTERRUPT_COALESCE_TIMEOUT_MAX_US * 100) { + if ((coalesce_timeout - max) < (2 * min - coalesce_timeout)) + break; + else{ + timeout_encode++; + break; + } + } else { + max = max * 2; + min = min * 2; + } + } + + if (timeout_encode == INTERRUPT_COALESCE_TIMEOUT_ENCODE_MAX + 1) + /* the value is out of range. */ + return SCI_FAILURE_INVALID_PARAMETER_VALUE; + } + + writel(SMU_ICC_GEN_VAL(NUMBER, coalesce_number) | + SMU_ICC_GEN_VAL(TIMER, timeout_encode), + &ihost->smu_registers->interrupt_coalesce_control); + + + ihost->interrupt_coalesce_number = (u16)coalesce_number; + ihost->interrupt_coalesce_timeout = coalesce_timeout / 100; + + return SCI_SUCCESS; +} + + +static void sci_controller_ready_state_enter(struct sci_base_state_machine *sm) +{ + struct isci_host *ihost = container_of(sm, typeof(*ihost), sm); + u32 val; + + /* enable clock gating for power control of the scu unit */ + val = readl(&ihost->smu_registers->clock_gating_control); + val &= ~(SMU_CGUCR_GEN_BIT(REGCLK_ENABLE) | + SMU_CGUCR_GEN_BIT(TXCLK_ENABLE) | + SMU_CGUCR_GEN_BIT(XCLK_ENABLE)); + val |= SMU_CGUCR_GEN_BIT(IDLE_ENABLE); + writel(val, &ihost->smu_registers->clock_gating_control); + + /* set the default interrupt coalescence number and timeout value. */ + sci_controller_set_interrupt_coalescence(ihost, 0, 0); +} + +static void sci_controller_ready_state_exit(struct sci_base_state_machine *sm) +{ + struct isci_host *ihost = container_of(sm, typeof(*ihost), sm); + + /* disable interrupt coalescence. */ + sci_controller_set_interrupt_coalescence(ihost, 0, 0); +} + +static enum sci_status sci_controller_stop_ports(struct isci_host *ihost) +{ + u32 index; + enum sci_status port_status; + enum sci_status status = SCI_SUCCESS; + + for (index = 0; index < ihost->logical_port_entries; index++) { + struct isci_port *iport = &ihost->ports[index]; + + port_status = sci_port_stop(iport); + + if ((port_status != SCI_SUCCESS) && + (port_status != SCI_FAILURE_INVALID_STATE)) { + status = SCI_FAILURE; + + dev_warn(&ihost->pdev->dev, + "%s: Controller stop operation failed to " + "stop port %d because of status %d.\n", + __func__, + iport->logical_port_index, + port_status); + } + } + + return status; +} + +static enum sci_status sci_controller_stop_devices(struct isci_host *ihost) +{ + u32 index; + enum sci_status status; + enum sci_status device_status; + + status = SCI_SUCCESS; + + for (index = 0; index < ihost->remote_node_entries; index++) { + if (ihost->device_table[index] != NULL) { + /* / @todo What timeout value do we want to provide to this request? */ + device_status = sci_remote_device_stop(ihost->device_table[index], 0); + + if ((device_status != SCI_SUCCESS) && + (device_status != SCI_FAILURE_INVALID_STATE)) { + dev_warn(&ihost->pdev->dev, + "%s: Controller stop operation failed " + "to stop device 0x%p because of " + "status %d.\n", + __func__, + ihost->device_table[index], device_status); + } + } + } + + return status; +} + +static void sci_controller_stopping_state_enter(struct sci_base_state_machine *sm) +{ + struct isci_host *ihost = container_of(sm, typeof(*ihost), sm); + + sci_controller_stop_devices(ihost); + sci_controller_stop_ports(ihost); + + if (!sci_controller_has_remote_devices_stopping(ihost)) + isci_host_stop_complete(ihost); +} + +static void sci_controller_stopping_state_exit(struct sci_base_state_machine *sm) +{ + struct isci_host *ihost = container_of(sm, typeof(*ihost), sm); + + sci_del_timer(&ihost->timer); +} + +static void sci_controller_reset_hardware(struct isci_host *ihost) +{ + /* Disable interrupts so we dont take any spurious interrupts */ + sci_controller_disable_interrupts(ihost); + + /* Reset the SCU */ + writel(0xFFFFFFFF, &ihost->smu_registers->soft_reset_control); + + /* Delay for 1ms to before clearing the CQP and UFQPR. */ + udelay(1000); + + /* The write to the CQGR clears the CQP */ + writel(0x00000000, &ihost->smu_registers->completion_queue_get); + + /* The write to the UFQGP clears the UFQPR */ + writel(0, &ihost->scu_registers->sdma.unsolicited_frame_get_pointer); + + /* clear all interrupts */ + writel(~SMU_INTERRUPT_STATUS_RESERVED_MASK, &ihost->smu_registers->interrupt_status); +} + +static void sci_controller_resetting_state_enter(struct sci_base_state_machine *sm) +{ + struct isci_host *ihost = container_of(sm, typeof(*ihost), sm); + + sci_controller_reset_hardware(ihost); + sci_change_state(&ihost->sm, SCIC_RESET); +} + +static const struct sci_base_state sci_controller_state_table[] = { + [SCIC_INITIAL] = { + .enter_state = sci_controller_initial_state_enter, + }, + [SCIC_RESET] = {}, + [SCIC_INITIALIZING] = {}, + [SCIC_INITIALIZED] = {}, + [SCIC_STARTING] = { + .exit_state = sci_controller_starting_state_exit, + }, + [SCIC_READY] = { + .enter_state = sci_controller_ready_state_enter, + .exit_state = sci_controller_ready_state_exit, + }, + [SCIC_RESETTING] = { + .enter_state = sci_controller_resetting_state_enter, + }, + [SCIC_STOPPING] = { + .enter_state = sci_controller_stopping_state_enter, + .exit_state = sci_controller_stopping_state_exit, + }, + [SCIC_FAILED] = {} +}; + +static void controller_timeout(unsigned long data) +{ + struct sci_timer *tmr = (struct sci_timer *)data; + struct isci_host *ihost = container_of(tmr, typeof(*ihost), timer); + struct sci_base_state_machine *sm = &ihost->sm; + unsigned long flags; + + spin_lock_irqsave(&ihost->scic_lock, flags); + + if (tmr->cancel) + goto done; + + if (sm->current_state_id == SCIC_STARTING) + sci_controller_transition_to_ready(ihost, SCI_FAILURE_TIMEOUT); + else if (sm->current_state_id == SCIC_STOPPING) { + sci_change_state(sm, SCIC_FAILED); + isci_host_stop_complete(ihost); + } else /* / @todo Now what do we want to do in this case? */ + dev_err(&ihost->pdev->dev, + "%s: Controller timer fired when controller was not " + "in a state being timed.\n", + __func__); + +done: + spin_unlock_irqrestore(&ihost->scic_lock, flags); +} + +static enum sci_status sci_controller_construct(struct isci_host *ihost, + void __iomem *scu_base, + void __iomem *smu_base) +{ + u8 i; + + sci_init_sm(&ihost->sm, sci_controller_state_table, SCIC_INITIAL); + + ihost->scu_registers = scu_base; + ihost->smu_registers = smu_base; + + sci_port_configuration_agent_construct(&ihost->port_agent); + + /* Construct the ports for this controller */ + for (i = 0; i < SCI_MAX_PORTS; i++) + sci_port_construct(&ihost->ports[i], i, ihost); + sci_port_construct(&ihost->ports[i], SCIC_SDS_DUMMY_PORT, ihost); + + /* Construct the phys for this controller */ + for (i = 0; i < SCI_MAX_PHYS; i++) { + /* Add all the PHYs to the dummy port */ + sci_phy_construct(&ihost->phys[i], + &ihost->ports[SCI_MAX_PORTS], i); + } + + ihost->invalid_phy_mask = 0; + + sci_init_timer(&ihost->timer, controller_timeout); + + return sci_controller_reset(ihost); +} + +int sci_oem_parameters_validate(struct sci_oem_params *oem, u8 version) +{ + int i; + + for (i = 0; i < SCI_MAX_PORTS; i++) + if (oem->ports[i].phy_mask > SCIC_SDS_PARM_PHY_MASK_MAX) + return -EINVAL; + + for (i = 0; i < SCI_MAX_PHYS; i++) + if (oem->phys[i].sas_address.high == 0 && + oem->phys[i].sas_address.low == 0) + return -EINVAL; + + if (oem->controller.mode_type == SCIC_PORT_AUTOMATIC_CONFIGURATION_MODE) { + for (i = 0; i < SCI_MAX_PHYS; i++) + if (oem->ports[i].phy_mask != 0) + return -EINVAL; + } else if (oem->controller.mode_type == SCIC_PORT_MANUAL_CONFIGURATION_MODE) { + u8 phy_mask = 0; + + for (i = 0; i < SCI_MAX_PHYS; i++) + phy_mask |= oem->ports[i].phy_mask; + + if (phy_mask == 0) + return -EINVAL; + } else + return -EINVAL; + + if (oem->controller.max_concurr_spin_up > MAX_CONCURRENT_DEVICE_SPIN_UP_COUNT || + oem->controller.max_concurr_spin_up < 1) + return -EINVAL; + + if (oem->controller.do_enable_ssc) { + if (version < ISCI_ROM_VER_1_1 && oem->controller.do_enable_ssc != 1) + return -EINVAL; + + if (version >= ISCI_ROM_VER_1_1) { + u8 test = oem->controller.ssc_sata_tx_spread_level; + + switch (test) { + case 0: + case 2: + case 3: + case 6: + case 7: + break; + default: + return -EINVAL; + } + + test = oem->controller.ssc_sas_tx_spread_level; + if (oem->controller.ssc_sas_tx_type == 0) { + switch (test) { + case 0: + case 2: + case 3: + break; + default: + return -EINVAL; + } + } else if (oem->controller.ssc_sas_tx_type == 1) { + switch (test) { + case 0: + case 3: + case 6: + break; + default: + return -EINVAL; + } + } + } + } + + return 0; +} + +static u8 max_spin_up(struct isci_host *ihost) +{ + if (ihost->user_parameters.max_concurr_spinup) + return min_t(u8, ihost->user_parameters.max_concurr_spinup, + MAX_CONCURRENT_DEVICE_SPIN_UP_COUNT); + else + return min_t(u8, ihost->oem_parameters.controller.max_concurr_spin_up, + MAX_CONCURRENT_DEVICE_SPIN_UP_COUNT); +} + +static void power_control_timeout(unsigned long data) +{ + struct sci_timer *tmr = (struct sci_timer *)data; + struct isci_host *ihost = container_of(tmr, typeof(*ihost), power_control.timer); + struct isci_phy *iphy; + unsigned long flags; + u8 i; + + spin_lock_irqsave(&ihost->scic_lock, flags); + + if (tmr->cancel) + goto done; + + ihost->power_control.phys_granted_power = 0; + + if (ihost->power_control.phys_waiting == 0) { + ihost->power_control.timer_started = false; + goto done; + } + + for (i = 0; i < SCI_MAX_PHYS; i++) { + + if (ihost->power_control.phys_waiting == 0) + break; + + iphy = ihost->power_control.requesters[i]; + if (iphy == NULL) + continue; + + if (ihost->power_control.phys_granted_power >= max_spin_up(ihost)) + break; + + ihost->power_control.requesters[i] = NULL; + ihost->power_control.phys_waiting--; + ihost->power_control.phys_granted_power++; + sci_phy_consume_power_handler(iphy); + + if (iphy->protocol == SAS_PROTOCOL_SSP) { + u8 j; + + for (j = 0; j < SCI_MAX_PHYS; j++) { + struct isci_phy *requester = ihost->power_control.requesters[j]; + + /* + * Search the power_control queue to see if there are other phys + * attached to the same remote device. If found, take all of + * them out of await_sas_power state. + */ + if (requester != NULL && requester != iphy) { + u8 other = memcmp(requester->frame_rcvd.iaf.sas_addr, + iphy->frame_rcvd.iaf.sas_addr, + sizeof(requester->frame_rcvd.iaf.sas_addr)); + + if (other == 0) { + ihost->power_control.requesters[j] = NULL; + ihost->power_control.phys_waiting--; + sci_phy_consume_power_handler(requester); + } + } + } + } + } + + /* + * It doesn't matter if the power list is empty, we need to start the + * timer in case another phy becomes ready. + */ + sci_mod_timer(tmr, SCIC_SDS_CONTROLLER_POWER_CONTROL_INTERVAL); + ihost->power_control.timer_started = true; + +done: + spin_unlock_irqrestore(&ihost->scic_lock, flags); +} + +void sci_controller_power_control_queue_insert(struct isci_host *ihost, + struct isci_phy *iphy) +{ + BUG_ON(iphy == NULL); + + if (ihost->power_control.phys_granted_power < max_spin_up(ihost)) { + ihost->power_control.phys_granted_power++; + sci_phy_consume_power_handler(iphy); + + /* + * stop and start the power_control timer. When the timer fires, the + * no_of_phys_granted_power will be set to 0 + */ + if (ihost->power_control.timer_started) + sci_del_timer(&ihost->power_control.timer); + + sci_mod_timer(&ihost->power_control.timer, + SCIC_SDS_CONTROLLER_POWER_CONTROL_INTERVAL); + ihost->power_control.timer_started = true; + + } else { + /* + * There are phys, attached to the same sas address as this phy, are + * already in READY state, this phy don't need wait. + */ + u8 i; + struct isci_phy *current_phy; + + for (i = 0; i < SCI_MAX_PHYS; i++) { + u8 other; + current_phy = &ihost->phys[i]; + + other = memcmp(current_phy->frame_rcvd.iaf.sas_addr, + iphy->frame_rcvd.iaf.sas_addr, + sizeof(current_phy->frame_rcvd.iaf.sas_addr)); + + if (current_phy->sm.current_state_id == SCI_PHY_READY && + current_phy->protocol == SAS_PROTOCOL_SSP && + other == 0) { + sci_phy_consume_power_handler(iphy); + break; + } + } + + if (i == SCI_MAX_PHYS) { + /* Add the phy in the waiting list */ + ihost->power_control.requesters[iphy->phy_index] = iphy; + ihost->power_control.phys_waiting++; + } + } +} + +void sci_controller_power_control_queue_remove(struct isci_host *ihost, + struct isci_phy *iphy) +{ + BUG_ON(iphy == NULL); + + if (ihost->power_control.requesters[iphy->phy_index]) + ihost->power_control.phys_waiting--; + + ihost->power_control.requesters[iphy->phy_index] = NULL; +} + +static int is_long_cable(int phy, unsigned char selection_byte) +{ + return !!(selection_byte & (1 << phy)); +} + +static int is_medium_cable(int phy, unsigned char selection_byte) +{ + return !!(selection_byte & (1 << (phy + 4))); +} + +static enum cable_selections decode_selection_byte( + int phy, + unsigned char selection_byte) +{ + return ((selection_byte & (1 << phy)) ? 1 : 0) + + (selection_byte & (1 << (phy + 4)) ? 2 : 0); +} + +static unsigned char *to_cable_select(struct isci_host *ihost) +{ + if (is_cable_select_overridden()) + return ((unsigned char *)&cable_selection_override) + + ihost->id; + else + return &ihost->oem_parameters.controller.cable_selection_mask; +} + +enum cable_selections decode_cable_selection(struct isci_host *ihost, int phy) +{ + return decode_selection_byte(phy, *to_cable_select(ihost)); +} + +char *lookup_cable_names(enum cable_selections selection) +{ + static char *cable_names[] = { + [short_cable] = "short", + [long_cable] = "long", + [medium_cable] = "medium", + [undefined_cable] = "<undefined, assumed long>" /* bit 0==1 */ + }; + return (selection <= undefined_cable) ? cable_names[selection] + : cable_names[undefined_cable]; +} + +#define AFE_REGISTER_WRITE_DELAY 10 + +static void sci_controller_afe_initialization(struct isci_host *ihost) +{ + struct scu_afe_registers __iomem *afe = &ihost->scu_registers->afe; + const struct sci_oem_params *oem = &ihost->oem_parameters; + struct pci_dev *pdev = ihost->pdev; + u32 afe_status; + u32 phy_id; + unsigned char cable_selection_mask = *to_cable_select(ihost); + + /* Clear DFX Status registers */ + writel(0x0081000f, &afe->afe_dfx_master_control0); + udelay(AFE_REGISTER_WRITE_DELAY); + + if (is_b0(pdev) || is_c0(pdev) || is_c1(pdev)) { + /* PM Rx Equalization Save, PM SPhy Rx Acknowledgement + * Timer, PM Stagger Timer + */ + writel(0x0007FFFF, &afe->afe_pmsn_master_control2); + udelay(AFE_REGISTER_WRITE_DELAY); + } + + /* Configure bias currents to normal */ + if (is_a2(pdev)) + writel(0x00005A00, &afe->afe_bias_control); + else if (is_b0(pdev) || is_c0(pdev)) + writel(0x00005F00, &afe->afe_bias_control); + else if (is_c1(pdev)) + writel(0x00005500, &afe->afe_bias_control); + + udelay(AFE_REGISTER_WRITE_DELAY); + + /* Enable PLL */ + if (is_a2(pdev)) + writel(0x80040908, &afe->afe_pll_control0); + else if (is_b0(pdev) || is_c0(pdev)) + writel(0x80040A08, &afe->afe_pll_control0); + else if (is_c1(pdev)) { + writel(0x80000B08, &afe->afe_pll_control0); + udelay(AFE_REGISTER_WRITE_DELAY); + writel(0x00000B08, &afe->afe_pll_control0); + udelay(AFE_REGISTER_WRITE_DELAY); + writel(0x80000B08, &afe->afe_pll_control0); + } + + udelay(AFE_REGISTER_WRITE_DELAY); + + /* Wait for the PLL to lock */ + do { + afe_status = readl(&afe->afe_common_block_status); + udelay(AFE_REGISTER_WRITE_DELAY); + } while ((afe_status & 0x00001000) == 0); + + if (is_a2(pdev)) { + /* Shorten SAS SNW lock time (RxLock timer value from 76 + * us to 50 us) + */ + writel(0x7bcc96ad, &afe->afe_pmsn_master_control0); + udelay(AFE_REGISTER_WRITE_DELAY); + } + + for (phy_id = 0; phy_id < SCI_MAX_PHYS; phy_id++) { + struct scu_afe_transceiver __iomem *xcvr = &afe->scu_afe_xcvr[phy_id]; + const struct sci_phy_oem_params *oem_phy = &oem->phys[phy_id]; + int cable_length_long = + is_long_cable(phy_id, cable_selection_mask); + int cable_length_medium = + is_medium_cable(phy_id, cable_selection_mask); + + if (is_a2(pdev)) { + /* All defaults, except the Receive Word + * Alignament/Comma Detect Enable....(0xe800) + */ + writel(0x00004512, &xcvr->afe_xcvr_control0); + udelay(AFE_REGISTER_WRITE_DELAY); + + writel(0x0050100F, &xcvr->afe_xcvr_control1); + udelay(AFE_REGISTER_WRITE_DELAY); + } else if (is_b0(pdev)) { + /* Configure transmitter SSC parameters */ + writel(0x00030000, &xcvr->afe_tx_ssc_control); + udelay(AFE_REGISTER_WRITE_DELAY); + } else if (is_c0(pdev)) { + /* Configure transmitter SSC parameters */ + writel(0x00010202, &xcvr->afe_tx_ssc_control); + udelay(AFE_REGISTER_WRITE_DELAY); + + /* All defaults, except the Receive Word + * Alignament/Comma Detect Enable....(0xe800) + */ + writel(0x00014500, &xcvr->afe_xcvr_control0); + udelay(AFE_REGISTER_WRITE_DELAY); + } else if (is_c1(pdev)) { + /* Configure transmitter SSC parameters */ + writel(0x00010202, &xcvr->afe_tx_ssc_control); + udelay(AFE_REGISTER_WRITE_DELAY); + + /* All defaults, except the Receive Word + * Alignament/Comma Detect Enable....(0xe800) + */ + writel(0x0001C500, &xcvr->afe_xcvr_control0); + udelay(AFE_REGISTER_WRITE_DELAY); + } + + /* Power up TX and RX out from power down (PWRDNTX and + * PWRDNRX) & increase TX int & ext bias 20%....(0xe85c) + */ + if (is_a2(pdev)) + writel(0x000003F0, &xcvr->afe_channel_control); + else if (is_b0(pdev)) { + writel(0x000003D7, &xcvr->afe_channel_control); + udelay(AFE_REGISTER_WRITE_DELAY); + + writel(0x000003D4, &xcvr->afe_channel_control); + } else if (is_c0(pdev)) { + writel(0x000001E7, &xcvr->afe_channel_control); + udelay(AFE_REGISTER_WRITE_DELAY); + + writel(0x000001E4, &xcvr->afe_channel_control); + } else if (is_c1(pdev)) { + writel(cable_length_long ? 0x000002F7 : 0x000001F7, + &xcvr->afe_channel_control); + udelay(AFE_REGISTER_WRITE_DELAY); + + writel(cable_length_long ? 0x000002F4 : 0x000001F4, + &xcvr->afe_channel_control); + } + udelay(AFE_REGISTER_WRITE_DELAY); + + if (is_a2(pdev)) { + /* Enable TX equalization (0xe824) */ + writel(0x00040000, &xcvr->afe_tx_control); + udelay(AFE_REGISTER_WRITE_DELAY); + } + + if (is_a2(pdev) || is_b0(pdev)) + /* RDPI=0x0(RX Power On), RXOOBDETPDNC=0x0, + * TPD=0x0(TX Power On), RDD=0x0(RX Detect + * Enabled) ....(0xe800) + */ + writel(0x00004100, &xcvr->afe_xcvr_control0); + else if (is_c0(pdev)) + writel(0x00014100, &xcvr->afe_xcvr_control0); + else if (is_c1(pdev)) + writel(0x0001C100, &xcvr->afe_xcvr_control0); + udelay(AFE_REGISTER_WRITE_DELAY); + + /* Leave DFE/FFE on */ + if (is_a2(pdev)) + writel(0x3F11103F, &xcvr->afe_rx_ssc_control0); + else if (is_b0(pdev)) { + writel(0x3F11103F, &xcvr->afe_rx_ssc_control0); + udelay(AFE_REGISTER_WRITE_DELAY); + /* Enable TX equalization (0xe824) */ + writel(0x00040000, &xcvr->afe_tx_control); + } else if (is_c0(pdev)) { + writel(0x01400C0F, &xcvr->afe_rx_ssc_control1); + udelay(AFE_REGISTER_WRITE_DELAY); + + writel(0x3F6F103F, &xcvr->afe_rx_ssc_control0); + udelay(AFE_REGISTER_WRITE_DELAY); + + /* Enable TX equalization (0xe824) */ + writel(0x00040000, &xcvr->afe_tx_control); + } else if (is_c1(pdev)) { + writel(cable_length_long ? 0x01500C0C : + cable_length_medium ? 0x01400C0D : 0x02400C0D, + &xcvr->afe_xcvr_control1); + udelay(AFE_REGISTER_WRITE_DELAY); + + writel(0x000003E0, &xcvr->afe_dfx_rx_control1); + udelay(AFE_REGISTER_WRITE_DELAY); + + writel(cable_length_long ? 0x33091C1F : + cable_length_medium ? 0x3315181F : 0x2B17161F, + &xcvr->afe_rx_ssc_control0); + udelay(AFE_REGISTER_WRITE_DELAY); + + /* Enable TX equalization (0xe824) */ + writel(0x00040000, &xcvr->afe_tx_control); + } + + udelay(AFE_REGISTER_WRITE_DELAY); + + writel(oem_phy->afe_tx_amp_control0, &xcvr->afe_tx_amp_control0); + udelay(AFE_REGISTER_WRITE_DELAY); + + writel(oem_phy->afe_tx_amp_control1, &xcvr->afe_tx_amp_control1); + udelay(AFE_REGISTER_WRITE_DELAY); + + writel(oem_phy->afe_tx_amp_control2, &xcvr->afe_tx_amp_control2); + udelay(AFE_REGISTER_WRITE_DELAY); + + writel(oem_phy->afe_tx_amp_control3, &xcvr->afe_tx_amp_control3); + udelay(AFE_REGISTER_WRITE_DELAY); + } + + /* Transfer control to the PEs */ + writel(0x00010f00, &afe->afe_dfx_master_control0); + udelay(AFE_REGISTER_WRITE_DELAY); +} + +static void sci_controller_initialize_power_control(struct isci_host *ihost) +{ + sci_init_timer(&ihost->power_control.timer, power_control_timeout); + + memset(ihost->power_control.requesters, 0, + sizeof(ihost->power_control.requesters)); + + ihost->power_control.phys_waiting = 0; + ihost->power_control.phys_granted_power = 0; +} + +static enum sci_status sci_controller_initialize(struct isci_host *ihost) +{ + struct sci_base_state_machine *sm = &ihost->sm; + enum sci_status result = SCI_FAILURE; + unsigned long i, state, val; + + if (ihost->sm.current_state_id != SCIC_RESET) { + dev_warn(&ihost->pdev->dev, "%s invalid state: %d\n", + __func__, ihost->sm.current_state_id); + return SCI_FAILURE_INVALID_STATE; + } + + sci_change_state(sm, SCIC_INITIALIZING); + + sci_init_timer(&ihost->phy_timer, phy_startup_timeout); + + ihost->next_phy_to_start = 0; + ihost->phy_startup_timer_pending = false; + + sci_controller_initialize_power_control(ihost); + + /* + * There is nothing to do here for B0 since we do not have to + * program the AFE registers. + * / @todo The AFE settings are supposed to be correct for the B0 but + * / presently they seem to be wrong. */ + sci_controller_afe_initialization(ihost); + + + /* Take the hardware out of reset */ + writel(0, &ihost->smu_registers->soft_reset_control); + + /* + * / @todo Provide meaningfull error code for hardware failure + * result = SCI_FAILURE_CONTROLLER_HARDWARE; */ + for (i = 100; i >= 1; i--) { + u32 status; + + /* Loop until the hardware reports success */ + udelay(SCU_CONTEXT_RAM_INIT_STALL_TIME); + status = readl(&ihost->smu_registers->control_status); + + if ((status & SCU_RAM_INIT_COMPLETED) == SCU_RAM_INIT_COMPLETED) + break; + } + if (i == 0) + goto out; + + /* + * Determine what are the actaul device capacities that the + * hardware will support */ + val = readl(&ihost->smu_registers->device_context_capacity); + + /* Record the smaller of the two capacity values */ + ihost->logical_port_entries = min(smu_max_ports(val), SCI_MAX_PORTS); + ihost->task_context_entries = min(smu_max_task_contexts(val), SCI_MAX_IO_REQUESTS); + ihost->remote_node_entries = min(smu_max_rncs(val), SCI_MAX_REMOTE_DEVICES); + + /* + * Make all PEs that are unassigned match up with the + * logical ports + */ + for (i = 0; i < ihost->logical_port_entries; i++) { + struct scu_port_task_scheduler_group_registers __iomem + *ptsg = &ihost->scu_registers->peg0.ptsg; + + writel(i, &ptsg->protocol_engine[i]); + } + + /* Initialize hardware PCI Relaxed ordering in DMA engines */ + val = readl(&ihost->scu_registers->sdma.pdma_configuration); + val |= SCU_PDMACR_GEN_BIT(PCI_RELAXED_ORDERING_ENABLE); + writel(val, &ihost->scu_registers->sdma.pdma_configuration); + + val = readl(&ihost->scu_registers->sdma.cdma_configuration); + val |= SCU_CDMACR_GEN_BIT(PCI_RELAXED_ORDERING_ENABLE); + writel(val, &ihost->scu_registers->sdma.cdma_configuration); + + /* + * Initialize the PHYs before the PORTs because the PHY registers + * are accessed during the port initialization. + */ + for (i = 0; i < SCI_MAX_PHYS; i++) { + result = sci_phy_initialize(&ihost->phys[i], + &ihost->scu_registers->peg0.pe[i].tl, + &ihost->scu_registers->peg0.pe[i].ll); + if (result != SCI_SUCCESS) + goto out; + } + + for (i = 0; i < ihost->logical_port_entries; i++) { + struct isci_port *iport = &ihost->ports[i]; + + iport->port_task_scheduler_registers = &ihost->scu_registers->peg0.ptsg.port[i]; + iport->port_pe_configuration_register = &ihost->scu_registers->peg0.ptsg.protocol_engine[0]; + iport->viit_registers = &ihost->scu_registers->peg0.viit[i]; + } + + result = sci_port_configuration_agent_initialize(ihost, &ihost->port_agent); + + out: + /* Advance the controller state machine */ + if (result == SCI_SUCCESS) + state = SCIC_INITIALIZED; + else + state = SCIC_FAILED; + sci_change_state(sm, state); + + return result; +} + +static int sci_controller_dma_alloc(struct isci_host *ihost) +{ + struct device *dev = &ihost->pdev->dev; + size_t size; + int i; + + /* detect re-initialization */ + if (ihost->completion_queue) + return 0; + + size = SCU_MAX_COMPLETION_QUEUE_ENTRIES * sizeof(u32); + ihost->completion_queue = dmam_alloc_coherent(dev, size, &ihost->cq_dma, + GFP_KERNEL); + if (!ihost->completion_queue) + return -ENOMEM; + + size = ihost->remote_node_entries * sizeof(union scu_remote_node_context); + ihost->remote_node_context_table = dmam_alloc_coherent(dev, size, &ihost->rnc_dma, + GFP_KERNEL); + + if (!ihost->remote_node_context_table) + return -ENOMEM; + + size = ihost->task_context_entries * sizeof(struct scu_task_context), + ihost->task_context_table = dmam_alloc_coherent(dev, size, &ihost->tc_dma, + GFP_KERNEL); + if (!ihost->task_context_table) + return -ENOMEM; + + size = SCI_UFI_TOTAL_SIZE; + ihost->ufi_buf = dmam_alloc_coherent(dev, size, &ihost->ufi_dma, GFP_KERNEL); + if (!ihost->ufi_buf) + return -ENOMEM; + + for (i = 0; i < SCI_MAX_IO_REQUESTS; i++) { + struct isci_request *ireq; + dma_addr_t dma; + + ireq = dmam_alloc_coherent(dev, sizeof(*ireq), &dma, GFP_KERNEL); + if (!ireq) + return -ENOMEM; + + ireq->tc = &ihost->task_context_table[i]; + ireq->owning_controller = ihost; + ireq->request_daddr = dma; + ireq->isci_host = ihost; + ihost->reqs[i] = ireq; + } + + return 0; +} + +static int sci_controller_mem_init(struct isci_host *ihost) +{ + int err = sci_controller_dma_alloc(ihost); + + if (err) + return err; + + writel(lower_32_bits(ihost->cq_dma), &ihost->smu_registers->completion_queue_lower); + writel(upper_32_bits(ihost->cq_dma), &ihost->smu_registers->completion_queue_upper); + + writel(lower_32_bits(ihost->rnc_dma), &ihost->smu_registers->remote_node_context_lower); + writel(upper_32_bits(ihost->rnc_dma), &ihost->smu_registers->remote_node_context_upper); + + writel(lower_32_bits(ihost->tc_dma), &ihost->smu_registers->host_task_table_lower); + writel(upper_32_bits(ihost->tc_dma), &ihost->smu_registers->host_task_table_upper); + + sci_unsolicited_frame_control_construct(ihost); + + /* + * Inform the silicon as to the location of the UF headers and + * address table. + */ + writel(lower_32_bits(ihost->uf_control.headers.physical_address), + &ihost->scu_registers->sdma.uf_header_base_address_lower); + writel(upper_32_bits(ihost->uf_control.headers.physical_address), + &ihost->scu_registers->sdma.uf_header_base_address_upper); + + writel(lower_32_bits(ihost->uf_control.address_table.physical_address), + &ihost->scu_registers->sdma.uf_address_table_lower); + writel(upper_32_bits(ihost->uf_control.address_table.physical_address), + &ihost->scu_registers->sdma.uf_address_table_upper); + + return 0; +} + +/** + * isci_host_init - (re-)initialize hardware and internal (private) state + * @ihost: host to init + * + * Any public facing objects (like asd_sas_port, and asd_sas_phys), or + * one-time initialization objects like locks and waitqueues, are + * not touched (they are initialized in isci_host_alloc) + */ +int isci_host_init(struct isci_host *ihost) +{ + int i, err; + enum sci_status status; + + spin_lock_irq(&ihost->scic_lock); + status = sci_controller_construct(ihost, scu_base(ihost), smu_base(ihost)); + spin_unlock_irq(&ihost->scic_lock); + if (status != SCI_SUCCESS) { + dev_err(&ihost->pdev->dev, + "%s: sci_controller_construct failed - status = %x\n", + __func__, + status); + return -ENODEV; + } + + spin_lock_irq(&ihost->scic_lock); + status = sci_controller_initialize(ihost); + spin_unlock_irq(&ihost->scic_lock); + if (status != SCI_SUCCESS) { + dev_warn(&ihost->pdev->dev, + "%s: sci_controller_initialize failed -" + " status = 0x%x\n", + __func__, status); + return -ENODEV; + } + + err = sci_controller_mem_init(ihost); + if (err) + return err; + + /* enable sgpio */ + writel(1, &ihost->scu_registers->peg0.sgpio.interface_control); + for (i = 0; i < isci_gpio_count(ihost); i++) + writel(SGPIO_HW_CONTROL, &ihost->scu_registers->peg0.sgpio.output_data_select[i]); + writel(0, &ihost->scu_registers->peg0.sgpio.vendor_specific_code); + + return 0; +} + +void sci_controller_link_up(struct isci_host *ihost, struct isci_port *iport, + struct isci_phy *iphy) +{ + switch (ihost->sm.current_state_id) { + case SCIC_STARTING: + sci_del_timer(&ihost->phy_timer); + ihost->phy_startup_timer_pending = false; + ihost->port_agent.link_up_handler(ihost, &ihost->port_agent, + iport, iphy); + sci_controller_start_next_phy(ihost); + break; + case SCIC_READY: + ihost->port_agent.link_up_handler(ihost, &ihost->port_agent, + iport, iphy); + break; + default: + dev_dbg(&ihost->pdev->dev, + "%s: SCIC Controller linkup event from phy %d in " + "unexpected state %d\n", __func__, iphy->phy_index, + ihost->sm.current_state_id); + } +} + +void sci_controller_link_down(struct isci_host *ihost, struct isci_port *iport, + struct isci_phy *iphy) +{ + switch (ihost->sm.current_state_id) { + case SCIC_STARTING: + case SCIC_READY: + ihost->port_agent.link_down_handler(ihost, &ihost->port_agent, + iport, iphy); + break; + default: + dev_dbg(&ihost->pdev->dev, + "%s: SCIC Controller linkdown event from phy %d in " + "unexpected state %d\n", + __func__, + iphy->phy_index, + ihost->sm.current_state_id); + } +} + +bool sci_controller_has_remote_devices_stopping(struct isci_host *ihost) +{ + u32 index; + + for (index = 0; index < ihost->remote_node_entries; index++) { + if ((ihost->device_table[index] != NULL) && + (ihost->device_table[index]->sm.current_state_id == SCI_DEV_STOPPING)) + return true; + } + + return false; +} + +void sci_controller_remote_device_stopped(struct isci_host *ihost, + struct isci_remote_device *idev) +{ + if (ihost->sm.current_state_id != SCIC_STOPPING) { + dev_dbg(&ihost->pdev->dev, + "SCIC Controller 0x%p remote device stopped event " + "from device 0x%p in unexpected state %d\n", + ihost, idev, + ihost->sm.current_state_id); + return; + } + + if (!sci_controller_has_remote_devices_stopping(ihost)) + isci_host_stop_complete(ihost); +} + +void sci_controller_post_request(struct isci_host *ihost, u32 request) +{ + dev_dbg(&ihost->pdev->dev, "%s[%d]: %#x\n", + __func__, ihost->id, request); + + writel(request, &ihost->smu_registers->post_context_port); +} + +struct isci_request *sci_request_by_tag(struct isci_host *ihost, u16 io_tag) +{ + u16 task_index; + u16 task_sequence; + + task_index = ISCI_TAG_TCI(io_tag); + + if (task_index < ihost->task_context_entries) { + struct isci_request *ireq = ihost->reqs[task_index]; + + if (test_bit(IREQ_ACTIVE, &ireq->flags)) { + task_sequence = ISCI_TAG_SEQ(io_tag); + + if (task_sequence == ihost->io_request_sequence[task_index]) + return ireq; + } + } + + return NULL; +} + +/** + * This method allocates remote node index and the reserves the remote node + * context space for use. This method can fail if there are no more remote + * node index available. + * @scic: This is the controller object which contains the set of + * free remote node ids + * @sci_dev: This is the device object which is requesting the a remote node + * id + * @node_id: This is the remote node id that is assinged to the device if one + * is available + * + * enum sci_status SCI_FAILURE_OUT_OF_RESOURCES if there are no available remote + * node index available. + */ +enum sci_status sci_controller_allocate_remote_node_context(struct isci_host *ihost, + struct isci_remote_device *idev, + u16 *node_id) +{ + u16 node_index; + u32 remote_node_count = sci_remote_device_node_count(idev); + + node_index = sci_remote_node_table_allocate_remote_node( + &ihost->available_remote_nodes, remote_node_count + ); + + if (node_index != SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX) { + ihost->device_table[node_index] = idev; + + *node_id = node_index; + + return SCI_SUCCESS; + } + + return SCI_FAILURE_INSUFFICIENT_RESOURCES; +} + +void sci_controller_free_remote_node_context(struct isci_host *ihost, + struct isci_remote_device *idev, + u16 node_id) +{ + u32 remote_node_count = sci_remote_device_node_count(idev); + + if (ihost->device_table[node_id] == idev) { + ihost->device_table[node_id] = NULL; + + sci_remote_node_table_release_remote_node_index( + &ihost->available_remote_nodes, remote_node_count, node_id + ); + } +} + +void sci_controller_copy_sata_response(void *response_buffer, + void *frame_header, + void *frame_buffer) +{ + /* XXX type safety? */ + memcpy(response_buffer, frame_header, sizeof(u32)); + + memcpy(response_buffer + sizeof(u32), + frame_buffer, + sizeof(struct dev_to_host_fis) - sizeof(u32)); +} + +void sci_controller_release_frame(struct isci_host *ihost, u32 frame_index) +{ + if (sci_unsolicited_frame_control_release_frame(&ihost->uf_control, frame_index)) + writel(ihost->uf_control.get, + &ihost->scu_registers->sdma.unsolicited_frame_get_pointer); +} + +void isci_tci_free(struct isci_host *ihost, u16 tci) +{ + u16 tail = ihost->tci_tail & (SCI_MAX_IO_REQUESTS-1); + + ihost->tci_pool[tail] = tci; + ihost->tci_tail = tail + 1; +} + +static u16 isci_tci_alloc(struct isci_host *ihost) +{ + u16 head = ihost->tci_head & (SCI_MAX_IO_REQUESTS-1); + u16 tci = ihost->tci_pool[head]; + + ihost->tci_head = head + 1; + return tci; +} + +static u16 isci_tci_space(struct isci_host *ihost) +{ + return CIRC_SPACE(ihost->tci_head, ihost->tci_tail, SCI_MAX_IO_REQUESTS); +} + +u16 isci_alloc_tag(struct isci_host *ihost) +{ + if (isci_tci_space(ihost)) { + u16 tci = isci_tci_alloc(ihost); + u8 seq = ihost->io_request_sequence[tci]; + + return ISCI_TAG(seq, tci); + } + + return SCI_CONTROLLER_INVALID_IO_TAG; +} + +enum sci_status isci_free_tag(struct isci_host *ihost, u16 io_tag) +{ + u16 tci = ISCI_TAG_TCI(io_tag); + u16 seq = ISCI_TAG_SEQ(io_tag); + + /* prevent tail from passing head */ + if (isci_tci_active(ihost) == 0) + return SCI_FAILURE_INVALID_IO_TAG; + + if (seq == ihost->io_request_sequence[tci]) { + ihost->io_request_sequence[tci] = (seq+1) & (SCI_MAX_SEQ-1); + + isci_tci_free(ihost, tci); + + return SCI_SUCCESS; + } + return SCI_FAILURE_INVALID_IO_TAG; +} + +enum sci_status sci_controller_start_io(struct isci_host *ihost, + struct isci_remote_device *idev, + struct isci_request *ireq) +{ + enum sci_status status; + + if (ihost->sm.current_state_id != SCIC_READY) { + dev_warn(&ihost->pdev->dev, "%s invalid state: %d\n", + __func__, ihost->sm.current_state_id); + return SCI_FAILURE_INVALID_STATE; + } + + status = sci_remote_device_start_io(ihost, idev, ireq); + if (status != SCI_SUCCESS) + return status; + + set_bit(IREQ_ACTIVE, &ireq->flags); + sci_controller_post_request(ihost, ireq->post_context); + return SCI_SUCCESS; +} + +enum sci_status sci_controller_terminate_request(struct isci_host *ihost, + struct isci_remote_device *idev, + struct isci_request *ireq) +{ + /* terminate an ongoing (i.e. started) core IO request. This does not + * abort the IO request at the target, but rather removes the IO + * request from the host controller. + */ + enum sci_status status; + + if (ihost->sm.current_state_id != SCIC_READY) { + dev_warn(&ihost->pdev->dev, "%s invalid state: %d\n", + __func__, ihost->sm.current_state_id); + return SCI_FAILURE_INVALID_STATE; + } + status = sci_io_request_terminate(ireq); + + dev_dbg(&ihost->pdev->dev, "%s: status=%d; ireq=%p; flags=%lx\n", + __func__, status, ireq, ireq->flags); + + if ((status == SCI_SUCCESS) && + !test_bit(IREQ_PENDING_ABORT, &ireq->flags) && + !test_and_set_bit(IREQ_TC_ABORT_POSTED, &ireq->flags)) { + /* Utilize the original post context command and or in the + * POST_TC_ABORT request sub-type. + */ + sci_controller_post_request( + ihost, ireq->post_context | + SCU_CONTEXT_COMMAND_REQUEST_POST_TC_ABORT); + } + return status; +} + +/** + * sci_controller_complete_io() - This method will perform core specific + * completion operations for an IO request. After this method is invoked, + * the user should consider the IO request as invalid until it is properly + * reused (i.e. re-constructed). + * @ihost: The handle to the controller object for which to complete the + * IO request. + * @idev: The handle to the remote device object for which to complete + * the IO request. + * @ireq: the handle to the io request object to complete. + */ +enum sci_status sci_controller_complete_io(struct isci_host *ihost, + struct isci_remote_device *idev, + struct isci_request *ireq) +{ + enum sci_status status; + u16 index; + + switch (ihost->sm.current_state_id) { + case SCIC_STOPPING: + /* XXX: Implement this function */ + return SCI_FAILURE; + case SCIC_READY: + status = sci_remote_device_complete_io(ihost, idev, ireq); + if (status != SCI_SUCCESS) + return status; + + index = ISCI_TAG_TCI(ireq->io_tag); + clear_bit(IREQ_ACTIVE, &ireq->flags); + return SCI_SUCCESS; + default: + dev_warn(&ihost->pdev->dev, "%s invalid state: %d\n", + __func__, ihost->sm.current_state_id); + return SCI_FAILURE_INVALID_STATE; + } + +} + +enum sci_status sci_controller_continue_io(struct isci_request *ireq) +{ + struct isci_host *ihost = ireq->owning_controller; + + if (ihost->sm.current_state_id != SCIC_READY) { + dev_warn(&ihost->pdev->dev, "%s invalid state: %d\n", + __func__, ihost->sm.current_state_id); + return SCI_FAILURE_INVALID_STATE; + } + + set_bit(IREQ_ACTIVE, &ireq->flags); + sci_controller_post_request(ihost, ireq->post_context); + return SCI_SUCCESS; +} + +/** + * sci_controller_start_task() - This method is called by the SCIC user to + * send/start a framework task management request. + * @controller: the handle to the controller object for which to start the task + * management request. + * @remote_device: the handle to the remote device object for which to start + * the task management request. + * @task_request: the handle to the task request object to start. + */ +enum sci_task_status sci_controller_start_task(struct isci_host *ihost, + struct isci_remote_device *idev, + struct isci_request *ireq) +{ + enum sci_status status; + + if (ihost->sm.current_state_id != SCIC_READY) { + dev_warn(&ihost->pdev->dev, + "%s: SCIC Controller starting task from invalid " + "state\n", + __func__); + return SCI_TASK_FAILURE_INVALID_STATE; + } + + status = sci_remote_device_start_task(ihost, idev, ireq); + switch (status) { + case SCI_FAILURE_RESET_DEVICE_PARTIAL_SUCCESS: + set_bit(IREQ_ACTIVE, &ireq->flags); + + /* + * We will let framework know this task request started successfully, + * although core is still woring on starting the request (to post tc when + * RNC is resumed.) + */ + return SCI_SUCCESS; + case SCI_SUCCESS: + set_bit(IREQ_ACTIVE, &ireq->flags); + sci_controller_post_request(ihost, ireq->post_context); + break; + default: + break; + } + + return status; +} + +static int sci_write_gpio_tx_gp(struct isci_host *ihost, u8 reg_index, u8 reg_count, u8 *write_data) +{ + int d; + + /* no support for TX_GP_CFG */ + if (reg_index == 0) + return -EINVAL; + + for (d = 0; d < isci_gpio_count(ihost); d++) { + u32 val = 0x444; /* all ODx.n clear */ + int i; + + for (i = 0; i < 3; i++) { + int bit = (i << 2) + 2; + + bit = try_test_sas_gpio_gp_bit(to_sas_gpio_od(d, i), + write_data, reg_index, + reg_count); + if (bit < 0) + break; + + /* if od is set, clear the 'invert' bit */ + val &= ~(bit << ((i << 2) + 2)); + } + + if (i < 3) + break; + writel(val, &ihost->scu_registers->peg0.sgpio.output_data_select[d]); + } + + /* unless reg_index is > 1, we should always be able to write at + * least one register + */ + return d > 0; +} + +int isci_gpio_write(struct sas_ha_struct *sas_ha, u8 reg_type, u8 reg_index, + u8 reg_count, u8 *write_data) +{ + struct isci_host *ihost = sas_ha->lldd_ha; + int written; + + switch (reg_type) { + case SAS_GPIO_REG_TX_GP: + written = sci_write_gpio_tx_gp(ihost, reg_index, reg_count, write_data); + break; + default: + written = -EINVAL; + } + + return written; +} |