/**
* xgene_ahci_do_hardreset - Issue the actual COMRESET
* @link: link to reset
* @deadline: deadline jiffies for the operation
* @online: Return value to indicate if device online
*
* Due to the limitation of the hardware PHY, a difference set of setting is
* required for each supported disk speed - Gen3 (6.0Gbps), Gen2 (3.0Gbps),
* and Gen1 (1.5Gbps). Otherwise during long IO stress test, the PHY will
* report disparity error and etc. In addition, during COMRESET, there can
* be error reported in the register PORT_SCR_ERR. For SERR_DISPARITY and
* SERR_10B_8B_ERR, the PHY receiver line must be reseted. The following
* algorithm is followed to proper configure the hardware PHY during COMRESET:
*
* Alg Part 1:
* 1. Start the PHY at Gen3 speed (default setting)
* 2. Issue the COMRESET
* 3. If no link, go to Alg Part 3
* 4. If link up, determine if the negotiated speed matches the PHY
* configured speed
* 5. If they matched, go to Alg Part 2
* 6. If they do not matched and first time, configure the PHY for the linked
* up disk speed and repeat step 2
* 7. Go to Alg Part 2
*
* Alg Part 2:
* 1. On link up, if there are any SERR_DISPARITY and SERR_10B_8B_ERR error
* reported in the register PORT_SCR_ERR, then reset the PHY receiver line
* 2. Go to Alg Part 3
*
* Alg Part 3:
* 1. Clear any pending from register PORT_SCR_ERR.
*
* NOTE: For the initial version, we will NOT support Gen1/Gen2. In addition
* and until the underlying PHY supports an method to reset the receiver
* line, on detection of SERR_DISPARITY or SERR_10B_8B_ERR errors,
* an warning message will be printed.
*/
static int xgene_ahci_do_hardreset(struct ata_link *link,
unsigned long deadline, bool *online)
{
const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
struct ata_port *ap = link->ap;
struct ahci_host_priv *hpriv = ap->host->private_data;
struct xgene_ahci_context *ctx = hpriv->plat_data;
struct ahci_port_priv *pp = ap->private_data;
u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
void __iomem *port_mmio = ahci_port_base(ap);
struct ata_taskfile tf;
int rc;
u32 val;
/* clear D2H reception area to properly wait for D2H FIS */
ata_tf_init(link->device, &tf);
tf.command = ATA_BUSY;
ata_tf_to_fis(&tf, 0, 0, d2h_fis);
rc = sata_link_hardreset(link, timing, deadline, online,
ahci_check_ready);
val = readl(port_mmio + PORT_SCR_ERR);
if (val & (SERR_DISPARITY | SERR_10B_8B_ERR))
dev_warn(ctx->dev, "link has error\n");
/* clear all errors if any pending */
val = readl(port_mmio + PORT_SCR_ERR);
writel(val, port_mmio + PORT_SCR_ERR);
return rc;
}
static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
{
int res;
struct sas_task *task;
struct domain_device *dev = qc->ap->private_data;
struct sas_ha_struct *sas_ha = dev->port->ha;
struct Scsi_Host *host = sas_ha->core.shost;
struct sas_internal *i = to_sas_internal(host->transportt);
struct scatterlist *sg;
unsigned int num = 0;
unsigned int xfer = 0;
task = sas_alloc_task(GFP_ATOMIC);
if (!task)
return AC_ERR_SYSTEM;
task->dev = dev;
task->task_proto = SAS_PROTOCOL_STP;
task->task_done = sas_ata_task_done;
if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
qc->tf.command == ATA_CMD_FPDMA_READ) {
/* Need to zero out the tag libata assigned us */
qc->tf.nsect = 0;
}
ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
task->uldd_task = qc;
if (ata_is_atapi(qc->tf.protocol)) {
memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
task->total_xfer_len = qc->nbytes + qc->pad_len;
task->num_scatter = qc->pad_len ? qc->n_elem + 1 : qc->n_elem;
} else {
ata_for_each_sg(sg, qc) {
num++;
xfer += sg->length;
}
task->total_xfer_len = xfer;
task->num_scatter = num;
}
static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
{
int res;
struct sas_task *task;
struct domain_device *dev = qc->ap->private_data;
struct sas_ha_struct *sas_ha = dev->port->ha;
struct Scsi_Host *host = sas_ha->core.shost;
struct sas_internal *i = to_sas_internal(host->transportt);
struct scatterlist *sg;
unsigned int xfer = 0;
unsigned int si;
/* If the device fell off, no sense in issuing commands */
if (dev->gone)
return AC_ERR_SYSTEM;
task = sas_alloc_task(GFP_ATOMIC);
if (!task)
return AC_ERR_SYSTEM;
task->dev = dev;
task->task_proto = SAS_PROTOCOL_STP;
task->task_done = sas_ata_task_done;
if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
qc->tf.command == ATA_CMD_FPDMA_READ) {
/* Need to zero out the tag libata assigned us */
qc->tf.nsect = 0;
}
ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
task->uldd_task = qc;
if (ata_is_atapi(qc->tf.protocol)) {
memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
task->total_xfer_len = qc->nbytes;
task->num_scatter = qc->n_elem;
} else {
for_each_sg(qc->sg, sg, qc->n_elem, si)
xfer += sg->length;
task->total_xfer_len = xfer;
task->num_scatter = si;
}
task->data_dir = qc->dma_dir;
task->scatter = qc->sg;
task->ata_task.retry_count = 1;
task->task_state_flags = SAS_TASK_STATE_PENDING;
qc->lldd_task = task;
switch (qc->tf.protocol) {
case ATA_PROT_NCQ:
task->ata_task.use_ncq = 1;
/* fall through */
case ATAPI_PROT_DMA:
case ATA_PROT_DMA:
task->ata_task.dma_xfer = 1;
break;
}
if (qc->scsicmd)
ASSIGN_SAS_TASK(qc->scsicmd, task);
if (sas_ha->lldd_max_execute_num < 2)
res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
else
res = sas_queue_up(task);
/* Examine */
if (res) {
SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
if (qc->scsicmd)
ASSIGN_SAS_TASK(qc->scsicmd, NULL);
sas_free_task(task);
return AC_ERR_SYSTEM;
}
return 0;
}
static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
{
unsigned long flags;
struct sas_task *task;
struct scatterlist *sg;
int ret = AC_ERR_SYSTEM;
unsigned int si, xfer = 0;
struct ata_port *ap = qc->ap;
struct domain_device *dev = ap->private_data;
struct sas_ha_struct *sas_ha = dev->port->ha;
struct Scsi_Host *host = sas_ha->core.shost;
struct sas_internal *i = to_sas_internal(host->transportt);
/* TODO: audit callers to ensure they are ready for qc_issue to
* unconditionally re-enable interrupts
*/
local_irq_save(flags);
spin_unlock(ap->lock);
/* If the device fell off, no sense in issuing commands */
if (test_bit(SAS_DEV_GONE, &dev->state))
goto out;
task = sas_alloc_task(GFP_ATOMIC);
if (!task)
goto out;
task->dev = dev;
task->task_proto = SAS_PROTOCOL_STP;
task->task_done = sas_ata_task_done;
if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
qc->tf.command == ATA_CMD_FPDMA_READ) {
/* Need to zero out the tag libata assigned us */
qc->tf.nsect = 0;
}
ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
task->uldd_task = qc;
if (ata_is_atapi(qc->tf.protocol)) {
memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
task->total_xfer_len = qc->nbytes;
task->num_scatter = qc->n_elem;
} else {
for_each_sg(qc->sg, sg, qc->n_elem, si)
xfer += sg->length;
task->total_xfer_len = xfer;
task->num_scatter = si;
}
task->data_dir = qc->dma_dir;
task->scatter = qc->sg;
task->ata_task.retry_count = 1;
task->task_state_flags = SAS_TASK_STATE_PENDING;
qc->lldd_task = task;
switch (qc->tf.protocol) {
case ATA_PROT_NCQ:
task->ata_task.use_ncq = 1;
/* fall through */
case ATAPI_PROT_DMA:
case ATA_PROT_DMA:
task->ata_task.dma_xfer = 1;
break;
}
if (qc->scsicmd)
ASSIGN_SAS_TASK(qc->scsicmd, task);
if (sas_ha->lldd_max_execute_num < 2)
ret = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
else
ret = sas_queue_up(task);
/* Examine */
if (ret) {
SAS_DPRINTK("lldd_execute_task returned: %d\n", ret);
if (qc->scsicmd)
ASSIGN_SAS_TASK(qc->scsicmd, NULL);
sas_free_task(task);
ret = AC_ERR_SYSTEM;
}
out:
spin_lock(ap->lock);
local_irq_restore(flags);
return ret;
}
