1 files changed, 236 insertions, 2 deletions

diff --git a/drivers/scsi/libata-bmdma.c b/drivers/scsi/libata-bmdma.c
index 96b4d2160df8..95d81d86d8b7 100644
--- a/drivers/scsi/libata-bmdma.c
+++ b/drivers/scsi/libata-bmdma.c
@@ -418,6 +418,240 @@ u8 ata_altstatus(struct ata_port *ap)
         return inb(ap->ioaddr.altstatus_addr);
 }
 
+/**
+ *      ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
+ *      @qc: Info associated with this ATA transaction.
+ *
+ *      LOCKING:
+ *      spin_lock_irqsave(host_set lock)
+ */
+
+static void ata_bmdma_setup_mmio (struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+        unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
+        u8 dmactl;
+        void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
+
+        /* load PRD table addr. */
+        mb();   /* make sure PRD table writes are visible to controller */
+        writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
+
+        /* specify data direction, triple-check start bit is clear */
+        dmactl = readb(mmio + ATA_DMA_CMD);
+        dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
+        if (!rw)
+                dmactl |= ATA_DMA_WR;
+        writeb(dmactl, mmio + ATA_DMA_CMD);
+
+        /* issue r/w command */
+        ap->ops->exec_command(ap, &qc->tf);
+}
+
+/**
+ *      ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
+ *      @qc: Info associated with this ATA transaction.
+ *
+ *      LOCKING:
+ *      spin_lock_irqsave(host_set lock)
+ */
+
+static void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+        void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
+        u8 dmactl;
+
+        /* start host DMA transaction */
+        dmactl = readb(mmio + ATA_DMA_CMD);
+        writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
+
+        /* Strictly, one may wish to issue a readb() here, to
+         * flush the mmio write.  However, control also passes
+         * to the hardware at this point, and it will interrupt
+         * us when we are to resume control.  So, in effect,
+         * we don't care when the mmio write flushes.
+         * Further, a read of the DMA status register _immediately_
+         * following the write may not be what certain flaky hardware
+         * is expected, so I think it is best to not add a readb()
+         * without first all the MMIO ATA cards/mobos.
+         * Or maybe I'm just being paranoid.
+         */
+}
+
+/**
+ *      ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
+ *      @qc: Info associated with this ATA transaction.
+ *
+ *      LOCKING:
+ *      spin_lock_irqsave(host_set lock)
+ */
+
+static void ata_bmdma_setup_pio (struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+        unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
+        u8 dmactl;
+
+        /* load PRD table addr. */
+        outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
+
+        /* specify data direction, triple-check start bit is clear */
+        dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+        dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
+        if (!rw)
+                dmactl |= ATA_DMA_WR;
+        outb(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+
+        /* issue r/w command */
+        ap->ops->exec_command(ap, &qc->tf);
+}
+
+/**
+ *      ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
+ *      @qc: Info associated with this ATA transaction.
+ *
+ *      LOCKING:
+ *      spin_lock_irqsave(host_set lock)
+ */
+
+static void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+        u8 dmactl;
+
+        /* start host DMA transaction */
+        dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+        outb(dmactl | ATA_DMA_START,
+             ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+}
+
+
+/**
+ *      ata_bmdma_start - Start a PCI IDE BMDMA transaction
+ *      @qc: Info associated with this ATA transaction.
+ *
+ *      Writes the ATA_DMA_START flag to the DMA command register.
+ *
+ *      May be used as the bmdma_start() entry in ata_port_operations.
+ *
+ *      LOCKING:
+ *      spin_lock_irqsave(host_set lock)
+ */
+void ata_bmdma_start(struct ata_queued_cmd *qc)
+{
+        if (qc->ap->flags & ATA_FLAG_MMIO)
+                ata_bmdma_start_mmio(qc);
+        else
+                ata_bmdma_start_pio(qc);
+}
+
+
+/**
+ *      ata_bmdma_setup - Set up PCI IDE BMDMA transaction
+ *      @qc: Info associated with this ATA transaction.
+ *
+ *      Writes address of PRD table to device's PRD Table Address
+ *      register, sets the DMA control register, and calls
+ *      ops->exec_command() to start the transfer.
+ *
+ *      May be used as the bmdma_setup() entry in ata_port_operations.
+ *
+ *      LOCKING:
+ *      spin_lock_irqsave(host_set lock)
+ */
+void ata_bmdma_setup(struct ata_queued_cmd *qc)
+{
+        if (qc->ap->flags & ATA_FLAG_MMIO)
+                ata_bmdma_setup_mmio(qc);
+        else
+                ata_bmdma_setup_pio(qc);
+}
+
+
+/**
+ *      ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
+ *      @ap: Port associated with this ATA transaction.
+ *
+ *      Clear interrupt and error flags in DMA status register.
+ *
+ *      May be used as the irq_clear() entry in ata_port_operations.
+ *
+ *      LOCKING:
+ *      spin_lock_irqsave(host_set lock)
+ */
+
+void ata_bmdma_irq_clear(struct ata_port *ap)
+{
+        if (!ap->ioaddr.bmdma_addr)
+                return;
+
+        if (ap->flags & ATA_FLAG_MMIO) {
+                void __iomem *mmio =
+                      ((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
+                writeb(readb(mmio), mmio);
+        } else {
+                unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
+                outb(inb(addr), addr);
+        }
+}
+
+
+/**
+ *      ata_bmdma_status - Read PCI IDE BMDMA status
+ *      @ap: Port associated with this ATA transaction.
+ *
+ *      Read and return BMDMA status register.
+ *
+ *      May be used as the bmdma_status() entry in ata_port_operations.
+ *
+ *      LOCKING:
+ *      spin_lock_irqsave(host_set lock)
+ */
+
+u8 ata_bmdma_status(struct ata_port *ap)
+{
+        u8 host_stat;
+        if (ap->flags & ATA_FLAG_MMIO) {
+                void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
+                host_stat = readb(mmio + ATA_DMA_STATUS);
+        } else
+                host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
+        return host_stat;
+}
+
+
+/**
+ *      ata_bmdma_stop - Stop PCI IDE BMDMA transfer
+ *      @qc: Command we are ending DMA for
+ *
+ *      Clears the ATA_DMA_START flag in the dma control register
+ *
+ *      May be used as the bmdma_stop() entry in ata_port_operations.
+ *
+ *      LOCKING:
+ *      spin_lock_irqsave(host_set lock)
+ */
+
+void ata_bmdma_stop(struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+        if (ap->flags & ATA_FLAG_MMIO) {
+                void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
+
+                /* clear start/stop bit */
+                writeb(readb(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
+                        mmio + ATA_DMA_CMD);
+        } else {
+                /* clear start/stop bit */
+                outb(inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD) & ~ATA_DMA_START,
+                        ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+        }
+
+        /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
+        ata_altstatus(ap);        /* dummy read */
+}
+
 #ifdef CONFIG_PCI
 static struct ata_probe_ent *
 ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
@@ -707,7 +941,7 @@ err_out:
  *      @pdev: PCI device
  *
  *      Some PCI ATA devices report simplex mode but in fact can be told to
- *      enter non simplex mode. This implements the neccessary logic to 
+ *      enter non simplex mode. This implements the neccessary logic to
  *      perform the task on such devices. Calling it on other devices will
  *      have -undefined- behaviour.
  */
@@ -732,7 +966,7 @@ unsigned long ata_pci_default_filter(const struct ata_port *ap, struct ata_devic
 {
         /* Filter out DMA modes if the device has been configured by
            the BIOS as PIO only */
-           
+
         if (ap->ioaddr.bmdma_addr == 0)
                 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
         return xfer_mask;