libata-sff: reorder SFF/BMDMA functions

Reorder functions such that SFF and BMDMA functions are grouped.
While at it, s/BMDMA/SFF in a few comments where it actually meant
SFF.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 226 insertions, 222 deletions

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 0e2c972292c..6400e875139 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -71,26 +71,6 @@ const struct ata_port_operations ata_sff_port_ops = {
 };
 EXPORT_SYMBOL_GPL(ata_sff_port_ops);
 
-const struct ata_port_operations ata_bmdma_port_ops = {
-        .inherits               = &ata_sff_port_ops,
-
-        .mode_filter            = ata_bmdma_mode_filter,
-
-        .bmdma_setup            = ata_bmdma_setup,
-        .bmdma_start            = ata_bmdma_start,
-        .bmdma_stop             = ata_bmdma_stop,
-        .bmdma_status           = ata_bmdma_status,
-};
-EXPORT_SYMBOL_GPL(ata_bmdma_port_ops);
-
-const struct ata_port_operations ata_bmdma32_port_ops = {
-        .inherits               = &ata_bmdma_port_ops,
-
-        .sff_data_xfer          = ata_sff_data_xfer32,
-        .port_start             = ata_sff_port_start32,
-};
-EXPORT_SYMBOL_GPL(ata_bmdma32_port_ops);
-
 /**
  *      ata_fill_sg - Fill PCI IDE PRD table
  *      @qc: Metadata associated with taskfile to be transferred
@@ -1750,7 +1730,7 @@ unsigned int ata_sff_host_intr(struct ata_port *ap,
                         goto idle_irq;
         }
 
-        /* ack bmdma irq events */
+        /* clear irq events */
         ap->ops->sff_irq_clear(ap);
 
         ata_sff_hsm_move(ap, qc, status, 0);
@@ -1904,7 +1884,7 @@ EXPORT_SYMBOL_GPL(ata_sff_lost_interrupt);
  *      ata_sff_freeze - Freeze SFF controller port
  *      @ap: port to freeze
  *
- *      Freeze BMDMA controller port.
+ *      Freeze SFF controller port.
  *
  *      LOCKING:
  *      Inherited from caller.
@@ -2533,208 +2513,8 @@ void ata_sff_std_ports(struct ata_ioports *ioaddr)
 }
 EXPORT_SYMBOL_GPL(ata_sff_std_ports);
 
-unsigned long ata_bmdma_mode_filter(struct ata_device *adev,
-                                    unsigned long xfer_mask)
-{
-        /* Filter out DMA modes if the device has been configured by
-           the BIOS as PIO only */
-
-        if (adev->link->ap->ioaddr.bmdma_addr == NULL)
-                xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
-        return xfer_mask;
-}
-EXPORT_SYMBOL_GPL(ata_bmdma_mode_filter);
-
-/**
- *      ata_bmdma_setup - Set up PCI IDE BMDMA transaction
- *      @qc: Info associated with this ATA transaction.
- *
- *      LOCKING:
- *      spin_lock_irqsave(host lock)
- */
-void ata_bmdma_setup(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. */
-        mb();   /* make sure PRD table writes are visible to controller */
-        iowrite32(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
-
-        /* specify data direction, triple-check start bit is clear */
-        dmactl = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
-        dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
-        if (!rw)
-                dmactl |= ATA_DMA_WR;
-        iowrite8(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
-
-        /* issue r/w command */
-        ap->ops->sff_exec_command(ap, &qc->tf);
-}
-EXPORT_SYMBOL_GPL(ata_bmdma_setup);
-
-/**
- *      ata_bmdma_start - Start a PCI IDE BMDMA transaction
- *      @qc: Info associated with this ATA transaction.
- *
- *      LOCKING:
- *      spin_lock_irqsave(host lock)
- */
-void ata_bmdma_start(struct ata_queued_cmd *qc)
-{
-        struct ata_port *ap = qc->ap;
-        u8 dmactl;
-
-        /* start host DMA transaction */
-        dmactl = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
-        iowrite8(dmactl | ATA_DMA_START, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
-
-        /* Strictly, one may wish to issue an ioread8() 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.
-         *
-         * FIXME: The posting of this write means I/O starts are
-         * unneccessarily delayed for MMIO
-         */
-}
-EXPORT_SYMBOL_GPL(ata_bmdma_start);
-
-/**
- *      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 lock)
- */
-void ata_bmdma_stop(struct ata_queued_cmd *qc)
-{
-        struct ata_port *ap = qc->ap;
-        void __iomem *mmio = ap->ioaddr.bmdma_addr;
-
-        /* clear start/stop bit */
-        iowrite8(ioread8(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
-                 mmio + ATA_DMA_CMD);
-
-        /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
-        ata_sff_dma_pause(ap);
-}
-EXPORT_SYMBOL_GPL(ata_bmdma_stop);
-
-/**
- *      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 lock)
- */
-u8 ata_bmdma_status(struct ata_port *ap)
-{
-        return ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
-}
-EXPORT_SYMBOL_GPL(ata_bmdma_status);
-
 #ifdef CONFIG_PCI
 
-/**
- *      ata_pci_bmdma_clear_simplex -   attempt to kick device out of simplex
- *      @pdev: PCI device
- *
- *      Some PCI ATA devices report simplex mode but in fact can be told to
- *      enter non simplex mode. This implements the necessary logic to
- *      perform the task on such devices. Calling it on other devices will
- *      have -undefined- behaviour.
- */
-int ata_pci_bmdma_clear_simplex(struct pci_dev *pdev)
-{
-        unsigned long bmdma = pci_resource_start(pdev, 4);
-        u8 simplex;
-
-        if (bmdma == 0)
-                return -ENOENT;
-
-        simplex = inb(bmdma + 0x02);
-        outb(simplex & 0x60, bmdma + 0x02);
-        simplex = inb(bmdma + 0x02);
-        if (simplex & 0x80)
-                return -EOPNOTSUPP;
-        return 0;
-}
-EXPORT_SYMBOL_GPL(ata_pci_bmdma_clear_simplex);
-
-/**
- *      ata_pci_bmdma_init - acquire PCI BMDMA resources and init ATA host
- *      @host: target ATA host
- *
- *      Acquire PCI BMDMA resources and initialize @host accordingly.
- *
- *      LOCKING:
- *      Inherited from calling layer (may sleep).
- *
- *      RETURNS:
- *      0 on success, -errno otherwise.
- */
-int ata_pci_bmdma_init(struct ata_host *host)
-{
-        struct device *gdev = host->dev;
-        struct pci_dev *pdev = to_pci_dev(gdev);
-        int i, rc;
-
-        /* No BAR4 allocation: No DMA */
-        if (pci_resource_start(pdev, 4) == 0)
-                return 0;
-
-        /* TODO: If we get no DMA mask we should fall back to PIO */
-        rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
-        if (rc)
-                return rc;
-        rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
-        if (rc)
-                return rc;
-
-        /* request and iomap DMA region */
-        rc = pcim_iomap_regions(pdev, 1 << 4, dev_driver_string(gdev));
-        if (rc) {
-                dev_printk(KERN_ERR, gdev, "failed to request/iomap BAR4\n");
-                return -ENOMEM;
-        }
-        host->iomap = pcim_iomap_table(pdev);
-
-        for (i = 0; i < 2; i++) {
-                struct ata_port *ap = host->ports[i];
-                void __iomem *bmdma = host->iomap[4] + 8 * i;
-
-                if (ata_port_is_dummy(ap))
-                        continue;
-
-                ap->ioaddr.bmdma_addr = bmdma;
-                if ((!(ap->flags & ATA_FLAG_IGN_SIMPLEX)) &&
-                    (ioread8(bmdma + 2) & 0x80))
-                        host->flags |= ATA_HOST_SIMPLEX;
-
-                ata_port_desc(ap, "bmdma 0x%llx",
-                    (unsigned long long)pci_resource_start(pdev, 4) + 8 * i);
-        }
-
-        return 0;
-}
-EXPORT_SYMBOL_GPL(ata_pci_bmdma_init);
-
 static int ata_resources_present(struct pci_dev *pdev, int port)
 {
         int i;
@@ -3059,3 +2839,227 @@ out:
 EXPORT_SYMBOL_GPL(ata_pci_sff_init_one);
 
 #endif /* CONFIG_PCI */
+
+const struct ata_port_operations ata_bmdma_port_ops = {
+        .inherits               = &ata_sff_port_ops,
+
+        .mode_filter            = ata_bmdma_mode_filter,
+
+        .bmdma_setup            = ata_bmdma_setup,
+        .bmdma_start            = ata_bmdma_start,
+        .bmdma_stop             = ata_bmdma_stop,
+        .bmdma_status           = ata_bmdma_status,
+};
+EXPORT_SYMBOL_GPL(ata_bmdma_port_ops);
+
+const struct ata_port_operations ata_bmdma32_port_ops = {
+        .inherits               = &ata_bmdma_port_ops,
+
+        .sff_data_xfer          = ata_sff_data_xfer32,
+        .port_start             = ata_sff_port_start32,
+};
+EXPORT_SYMBOL_GPL(ata_bmdma32_port_ops);
+
+unsigned long ata_bmdma_mode_filter(struct ata_device *adev,
+                                    unsigned long xfer_mask)
+{
+        /* Filter out DMA modes if the device has been configured by
+           the BIOS as PIO only */
+
+        if (adev->link->ap->ioaddr.bmdma_addr == NULL)
+                xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
+        return xfer_mask;
+}
+EXPORT_SYMBOL_GPL(ata_bmdma_mode_filter);
+
+/**
+ *      ata_bmdma_setup - Set up PCI IDE BMDMA transaction
+ *      @qc: Info associated with this ATA transaction.
+ *
+ *      LOCKING:
+ *      spin_lock_irqsave(host lock)
+ */
+void ata_bmdma_setup(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. */
+        mb();   /* make sure PRD table writes are visible to controller */
+        iowrite32(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
+
+        /* specify data direction, triple-check start bit is clear */
+        dmactl = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+        dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
+        if (!rw)
+                dmactl |= ATA_DMA_WR;
+        iowrite8(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+
+        /* issue r/w command */
+        ap->ops->sff_exec_command(ap, &qc->tf);
+}
+EXPORT_SYMBOL_GPL(ata_bmdma_setup);
+
+/**
+ *      ata_bmdma_start - Start a PCI IDE BMDMA transaction
+ *      @qc: Info associated with this ATA transaction.
+ *
+ *      LOCKING:
+ *      spin_lock_irqsave(host lock)
+ */
+void ata_bmdma_start(struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+        u8 dmactl;
+
+        /* start host DMA transaction */
+        dmactl = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+        iowrite8(dmactl | ATA_DMA_START, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+
+        /* Strictly, one may wish to issue an ioread8() 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.
+         *
+         * FIXME: The posting of this write means I/O starts are
+         * unneccessarily delayed for MMIO
+         */
+}
+EXPORT_SYMBOL_GPL(ata_bmdma_start);
+
+/**
+ *      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 lock)
+ */
+void ata_bmdma_stop(struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+        void __iomem *mmio = ap->ioaddr.bmdma_addr;
+
+        /* clear start/stop bit */
+        iowrite8(ioread8(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
+                 mmio + ATA_DMA_CMD);
+
+        /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
+        ata_sff_dma_pause(ap);
+}
+EXPORT_SYMBOL_GPL(ata_bmdma_stop);
+
+/**
+ *      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 lock)
+ */
+u8 ata_bmdma_status(struct ata_port *ap)
+{
+        return ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
+}
+EXPORT_SYMBOL_GPL(ata_bmdma_status);
+
+#ifdef CONFIG_PCI
+
+/**
+ *      ata_pci_bmdma_clear_simplex -   attempt to kick device out of simplex
+ *      @pdev: PCI device
+ *
+ *      Some PCI ATA devices report simplex mode but in fact can be told to
+ *      enter non simplex mode. This implements the necessary logic to
+ *      perform the task on such devices. Calling it on other devices will
+ *      have -undefined- behaviour.
+ */
+int ata_pci_bmdma_clear_simplex(struct pci_dev *pdev)
+{
+        unsigned long bmdma = pci_resource_start(pdev, 4);
+        u8 simplex;
+
+        if (bmdma == 0)
+                return -ENOENT;
+
+        simplex = inb(bmdma + 0x02);
+        outb(simplex & 0x60, bmdma + 0x02);
+        simplex = inb(bmdma + 0x02);
+        if (simplex & 0x80)
+                return -EOPNOTSUPP;
+        return 0;
+}
+EXPORT_SYMBOL_GPL(ata_pci_bmdma_clear_simplex);
+
+/**
+ *      ata_pci_bmdma_init - acquire PCI BMDMA resources and init ATA host
+ *      @host: target ATA host
+ *
+ *      Acquire PCI BMDMA resources and initialize @host accordingly.
+ *
+ *      LOCKING:
+ *      Inherited from calling layer (may sleep).
+ *
+ *      RETURNS:
+ *      0 on success, -errno otherwise.
+ */
+int ata_pci_bmdma_init(struct ata_host *host)
+{
+        struct device *gdev = host->dev;
+        struct pci_dev *pdev = to_pci_dev(gdev);
+        int i, rc;
+
+        /* No BAR4 allocation: No DMA */
+        if (pci_resource_start(pdev, 4) == 0)
+                return 0;
+
+        /* TODO: If we get no DMA mask we should fall back to PIO */
+        rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
+        if (rc)
+                return rc;
+        rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
+        if (rc)
+                return rc;
+
+        /* request and iomap DMA region */
+        rc = pcim_iomap_regions(pdev, 1 << 4, dev_driver_string(gdev));
+        if (rc) {
+                dev_printk(KERN_ERR, gdev, "failed to request/iomap BAR4\n");
+                return -ENOMEM;
+        }
+        host->iomap = pcim_iomap_table(pdev);
+
+        for (i = 0; i < 2; i++) {
+                struct ata_port *ap = host->ports[i];
+                void __iomem *bmdma = host->iomap[4] + 8 * i;
+
+                if (ata_port_is_dummy(ap))
+                        continue;
+
+                ap->ioaddr.bmdma_addr = bmdma;
+                if ((!(ap->flags & ATA_FLAG_IGN_SIMPLEX)) &&
+                    (ioread8(bmdma + 2) & 0x80))
+                        host->flags |= ATA_HOST_SIMPLEX;
+
+                ata_port_desc(ap, "bmdma 0x%llx",
+                    (unsigned long long)pci_resource_start(pdev, 4) + 8 * i);
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(ata_pci_bmdma_init);
+
+#endif /* CONFIG_PCI */