isci: Intel(R) C600 Series Chipset Storage Control Unit Driver
Support for the up to 2x4-port 6Gb/s SAS controllers embedded in the
chipset.
This is a snapshot of the first publicly available version of the driver,
commit 4c1db2d0 in the 'historical' branch.
git://git.kernel.org/pub/scm/linux/kernel/git/djbw/isci.git historical
Signed-off-by: Maciej Trela <maciej.trela@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Edmund Nadolski <edmund.nadolski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/scsi/isci/sata.c b/drivers/scsi/isci/sata.c
new file mode 100644
index 0000000..19b0eea
--- /dev/null
+++ b/drivers/scsi/isci/sata.c
@@ -0,0 +1,356 @@
+/*
+ * 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 "isci.h"
+#include "scic_remote_device.h"
+#include "scic_sds_remote_device.h"
+#include "scic_io_request.h"
+#include "scic_task_request.h"
+#include "task.h"
+#include "request.h"
+#include "sata.h"
+#include "intel_sat.h"
+#include "intel_ata.h"
+
+static u8 isci_sata_get_management_task_protocol(struct isci_tmf *tmf);
+
+
+/**
+ * isci_sata_task_to_fis_copy() - This function gets the host_to_dev_fis from
+ * the core and copies the fis from the task into it.
+ * @task: This parameter is a pointer to the task struct from libsas.
+ *
+ * pointer to the host_to_dev_fis from the core request object.
+ */
+struct host_to_dev_fis *isci_sata_task_to_fis_copy(struct sas_task *task)
+{
+ struct isci_request *request = task->lldd_task;
+ struct host_to_dev_fis *register_fis =
+ scic_stp_io_request_get_h2d_reg_address(
+ request->sci_request_handle
+ );
+
+ memcpy(
+ (u8 *)register_fis,
+ (u8 *)&task->ata_task.fis,
+ sizeof(struct host_to_dev_fis)
+ );
+
+ if (!task->ata_task.device_control_reg_update)
+ register_fis->flags |= 0x80;
+
+ register_fis->flags &= 0xF0;
+
+ return register_fis;
+}
+
+/**
+ * isci_sata_is_task_ncq() - This function determines if the given stp task is
+ * a ncq request.
+ * @task: This parameter is a pointer to the task struct from libsas.
+ *
+ * true if the task is ncq
+ */
+bool isci_sata_is_task_ncq(struct sas_task *task)
+{
+ struct ata_queued_cmd *qc = task->uldd_task;
+
+ bool ret = (qc &&
+ (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
+ qc->tf.command == ATA_CMD_FPDMA_READ));
+
+ return ret;
+}
+
+/**
+ * isci_sata_set_ncq_tag() - This function sets the ncq tag field in the
+ * host_to_dev_fis equal to the tag in the queue command in the task.
+ * @task: This parameter is a pointer to the task struct from libsas.
+ * @register_fis: This parameter is a pointer to the host_to_dev_fis from the
+ * core request object.
+ *
+ */
+void isci_sata_set_ncq_tag(
+ struct host_to_dev_fis *register_fis,
+ struct sas_task *task)
+{
+ struct ata_queued_cmd *qc = task->uldd_task;
+ struct isci_request *request = task->lldd_task;
+
+ register_fis->sector_count = qc->tag << 3;
+ scic_stp_io_request_set_ncq_tag(request->sci_request_handle, qc->tag);
+}
+
+/**
+ * isci_request_process_stp_response() - This function sets the status and
+ * response, in the task struct, from the request object for the upper layer
+ * driver.
+ * @sas_task: This parameter is the task struct from the upper layer driver.
+ * @response_buffer: This parameter points to the response of the completed
+ * request.
+ *
+ * none.
+ */
+void isci_request_process_stp_response(
+ struct sas_task *task,
+ void *response_buffer)
+{
+ struct sata_fis_reg_d2h *d2h_reg_fis = (struct sata_fis_reg_d2h *)response_buffer;
+ struct task_status_struct *ts = &task->task_status;
+ struct ata_task_resp *resp = (void *)&ts->buf[0];
+
+ resp->frame_len = le16_to_cpu(*(__le16 *)(response_buffer + 6));
+ memcpy(&resp->ending_fis[0], response_buffer + 16, 24);
+ ts->buf_valid_size = sizeof(*resp);
+
+ /**
+ * If the device fault bit is set in the status register, then
+ * set the sense data and return.
+ */
+ if (d2h_reg_fis->status & ATA_STATUS_REG_DEVICE_FAULT_BIT)
+ ts->stat = SAS_PROTO_RESPONSE;
+ else
+ ts->stat = SAM_STAT_GOOD;
+
+ ts->resp = SAS_TASK_COMPLETE;
+}
+
+/**
+ * isci_sata_get_sat_protocol() - retrieve the sat protocol for the request
+ * @isci_request: ata request
+ *
+ * Note: temporary implementation until expert mode removes the callback
+ *
+ */
+u8 isci_sata_get_sat_protocol(struct isci_request *isci_request)
+{
+ struct sas_task *task;
+ struct domain_device *dev;
+
+ dev_dbg(&isci_request->isci_host->pdev->dev,
+ "%s: isci_request = %p, ttype = %d\n",
+ __func__, isci_request, isci_request->ttype);
+
+ if (tmf_task == isci_request->ttype) {
+ struct isci_tmf *tmf = isci_request_access_tmf(isci_request);
+
+ return isci_sata_get_management_task_protocol(tmf);
+ }
+
+ task = isci_request_access_task(isci_request);
+ dev = task->dev;
+
+ if (!sas_protocol_ata(task->task_proto)) {
+ WARN(1, "unhandled task protocol\n");
+ return SAT_PROTOCOL_NON_DATA;
+ }
+
+ if (task->data_dir == DMA_NONE)
+ return SAT_PROTOCOL_NON_DATA;
+
+ /* the "_IN" protocol types are equivalent to their "_OUT"
+ * analogs as far as the core is concerned
+ */
+ if (dev->sata_dev.command_set == ATAPI_COMMAND_SET) {
+ if (task->ata_task.dma_xfer)
+ return SAT_PROTOCOL_PACKET_DMA_DATA_IN;
+ else
+ return SAT_PROTOCOL_PACKET_PIO_DATA_IN;
+ }
+
+ if (task->ata_task.use_ncq)
+ return SAT_PROTOCOL_FPDMA;
+
+ if (task->ata_task.dma_xfer)
+ return SAT_PROTOCOL_UDMA_DATA_IN;
+ else
+ return SAT_PROTOCOL_PIO_DATA_IN;
+}
+
+static u8 isci_sata_get_management_task_protocol(
+ struct isci_tmf *tmf)
+{
+ u8 ret = 0;
+
+ pr_warn("tmf = %p, func = %d\n", tmf, tmf->tmf_code);
+
+ if ((tmf->tmf_code == isci_tmf_sata_srst_high) ||
+ (tmf->tmf_code == isci_tmf_sata_srst_low)) {
+ pr_warn("%s: tmf->tmf_code == TMF_LU_RESET\n", __func__);
+ ret = SAT_PROTOCOL_SOFT_RESET;
+ }
+
+ return ret;
+}
+
+enum sci_status isci_sata_management_task_request_build(
+ struct isci_request *isci_request)
+{
+ struct isci_tmf *isci_tmf;
+ enum sci_status status;
+
+ if (tmf_task != isci_request->ttype)
+ return SCI_FAILURE;
+
+ isci_tmf = isci_request_access_tmf(isci_request);
+
+ switch (isci_tmf->tmf_code) {
+
+ case isci_tmf_sata_srst_high:
+ case isci_tmf_sata_srst_low:
+ {
+ struct host_to_dev_fis *register_fis =
+ scic_stp_io_request_get_h2d_reg_address(
+ isci_request->sci_request_handle
+ );
+
+ memset(register_fis, 0, sizeof(*register_fis));
+
+ register_fis->fis_type = 0x27;
+ register_fis->flags &= ~0x80;
+ register_fis->flags &= 0xF0;
+ if (isci_tmf->tmf_code == isci_tmf_sata_srst_high)
+ register_fis->control |= ATA_SRST;
+ else
+ register_fis->control &= ~ATA_SRST;
+ break;
+ }
+ /* other management commnd go here... */
+ default:
+ return SCI_FAILURE;
+ }
+
+ /* core builds the protocol specific request
+ * based on the h2d fis.
+ */
+ status = scic_task_request_construct_sata(
+ isci_request->sci_request_handle
+ );
+
+ return status;
+}
+
+/**
+ * isci_task_send_lu_reset_sata() - This function is called by of the SAS
+ * Domain Template functions. This is one of the Task Management functoins
+ * called by libsas, to reset the given SAS lun. Note the assumption that
+ * while this call is executing, no I/O will be sent by the host to the
+ * device.
+ * @lun: This parameter specifies the lun to be reset.
+ *
+ * status, zero indicates success.
+ */
+int isci_task_send_lu_reset_sata(
+ struct isci_host *isci_host,
+ struct isci_remote_device *isci_device,
+ u8 *lun)
+{
+ struct isci_tmf tmf;
+ int ret = TMF_RESP_FUNC_FAILED;
+ unsigned long flags;
+
+ /* Send the initial SRST to the target */
+ #define ISCI_SRST_TIMEOUT_MS 20 /* 20 ms timeout. */
+ isci_task_build_tmf(&tmf, isci_device, isci_tmf_sata_srst_high,
+ NULL, NULL
+ );
+
+ ret = isci_task_execute_tmf(isci_host, &tmf, ISCI_SRST_TIMEOUT_MS);
+
+ if (ret != TMF_RESP_FUNC_COMPLETE) {
+ dev_warn(&isci_host->pdev->dev,
+ "%s: Assert SRST failed (%p) = %x",
+ __func__,
+ isci_device,
+ ret);
+
+ /* Return the failure so that the LUN reset is escalated
+ * to a target reset.
+ */
+ goto out;
+ }
+
+ /* Leave SRST high for a bit. */
+ #define ISCI_SRST_ASSERT_DELAY 100 /* usecs */
+ scic_cb_stall_execution(ISCI_SRST_ASSERT_DELAY);
+
+ /* Deassert SRST. */
+ isci_task_build_tmf(&tmf, isci_device, isci_tmf_sata_srst_low,
+ NULL, NULL
+ );
+ ret = isci_task_execute_tmf(isci_host, &tmf, ISCI_SRST_TIMEOUT_MS);
+
+ if (ret == TMF_RESP_FUNC_COMPLETE)
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: SATA LUN reset passed (%p)\n",
+ __func__,
+ isci_device);
+ else
+ dev_warn(&isci_host->pdev->dev,
+ "%s: Deassert SRST failed (%p)=%x\n",
+ __func__,
+ isci_device,
+ ret);
+
+ out:
+ spin_lock_irqsave(&isci_host->scic_lock, flags);
+
+ /* Resume the device. */
+ scic_sds_remote_device_resume(isci_device->sci_device_handle);
+
+ spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+
+ return ret;
+}