Put the "start/stop FIS RX" operation into ahci_start_fis_rx() and
ahci_stop_fis_rx().
Signed-off-by: Forrest Zhao <forrest.zhaot@xxxxxxxxx>
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxx>
---
drivers/scsi/ahci.c | 75 ++++++++++++++++++++++++++++++++++++++++++++
+++++++
1 files changed, 75 insertions(+), 0 deletions(-)
a94f89e6d8fecdbc0b196a69c0c966df9eb5c648
diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index 0ff8be1..f4dd60c 100644
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -207,6 +207,10 @@ static int ahci_port_start(struct ata_po
static void ahci_port_stop(struct ata_port *ap);
static int ahci_start_engine(void __iomem *port_mmio);
static int ahci_stop_engine(void __iomem *port_mmio);
+static void ahci_start_fis_rx(void __iomem *port_mmio,
+ struct ahci_port_priv *pp,
+ struct ahci_host_priv *hpriv);
+static int ahci_stop_fis_rx(void __iomem *port_mmio);
static void ahci_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
static void ahci_qc_prep(struct ata_queued_cmd *qc);
static u8 ahci_check_status(struct ata_port *ap);
@@ -570,6 +574,77 @@ static int ahci_start_engine(void __iome
return 0;
}
+static int ahci_stop_fis_rx(void __iomem *port_mmio)
+{
+ u32 tmp;
+
+ /*
+ * Get current status
+ */
+ tmp = readl(port_mmio + PORT_CMD);
+
+ /* Check if FIS RX is already disabled */
+ if ((tmp & PORT_CMD_FIS_RX) == 0)
+ return 0;
+
+ /*
+ * AHCI Rev 1.1 section 10.3.2
+ * Software shall not clear PxCMD.FRE while
+ * PxCMD.ST or PxCMD.CR is set to '1'
+ */
+ if (tmp & (PORT_CMD_LIST_ON | PORT_CMD_START)) {
+ return -EPERM;
+ }
+
+ /*
+ * Disable FIS reception
+ *
+ * AHCI Rev 1.1 Section 10.1.2:
+ * If PxCMD.FRE is set to '1', software should clear it
+ * to '0' and wait at least 500 milliseconds for PxCMD.FR
+ * to return '0' when read. If PxCMD.FR does not clear
+ * '0' correctly, then software may attempt a port reset
+ * of a full HBA reset to recover.
+ */
+ tmp &= ~(PORT_CMD_FIS_RX);
+ writel(tmp, port_mmio + PORT_CMD);
+
+ tmp = ata_wait_register(port_mmio + PORT_CMD, PORT_CMD_FIS_ON,
+ PORT_CMD_FIS_ON, 1, 1000);
+ if(tmp & PORT_CMD_FIS_ON)
+ return -EBUSY;
+
+ return 0;
+}
+
+static void ahci_start_fis_rx(void __iomem *port_mmio,
+ struct ahci_port_priv *pp,
+ struct ahci_host_priv *hpriv)
+{
+ u32 tmp;
+
+ /*
+ * Set FIS registers
+ */
+ if (hpriv->cap & HOST_CAP_64)
+ writel((pp->cmd_slot_dma >> 16) >> 16, port_mmio + PORT_LST_ADDR_HI);
+ writel(pp->cmd_slot_dma & 0xffffffff, port_mmio + PORT_LST_ADDR);
+ readl(port_mmio + PORT_LST_ADDR); /* flush */
+
+ if (hpriv->cap & HOST_CAP_64)
+ writel((pp->rx_fis_dma >> 16) >> 16, port_mmio + PORT_FIS_ADDR_HI);
+ writel(pp->rx_fis_dma & 0xffffffff, port_mmio + PORT_FIS_ADDR);
+ readl(port_mmio + PORT_FIS_ADDR); /* flush */
+
+ /*
+ * Enable FIS reception
+ */
+ tmp = readl(port_mmio + PORT_CMD);
+ tmp |= PORT_CMD_FIS_RX;
+ writel(tmp, port_mmio + PORT_CMD);
+ readl(port_mmio + PORT_CMD); /* flush */
+}
+
static unsigned int ahci_dev_classify(struct ata_port *ap)
{
void __iomem *port_mmio = (void __iomem *) ap->ioaddr.cmd_addr;
--
1.2.6
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