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authorTejun Heo <tj@kernel.org>2010-05-10 21:41:32 +0200
committerJeff Garzik <jgarzik@redhat.com>2010-05-17 22:49:07 -0400
commit9f2f72107ff621fdf3066e5a1b5ecb03ee587ebc (patch)
tree266c1371cb706c941ebaebd097380beccd530041 /drivers/ata
parent6bc0d390dd3dfb7be4325ad0685ae8ec2baf15a4 (diff)
downloadlinux-2.6.34-ux500-9f2f72107ff621fdf3066e5a1b5ecb03ee587ebc.tar.gz
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>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/libata-sff.c448
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 */