libata: rename SFF functions

SFF functions have confusing names.  Some have sff prefix, some have
bmdma, some std, some pci and some none.  Unify the naming by...

* SFF functions which are common to both BMDMA and non-BMDMA are
  prefixed with ata_sff_.

* SFF functions which are specific to BMDMA are prefixed with
  ata_bmdma_.

* SFF functions which are specific to PCI but apply to both BMDMA and
  non-BMDMA are prefixed with ata_pci_sff_.

* SFF functions which are specific to PCI and BMDMA are prefixed with
  ata_pci_bmdma_.

* Drop generic prefixes from LLD specific routines.  For example,
  bfin_std_dev_select -> bfin_dev_select.

The following renames are noteworthy.

  ata_qc_issue_prot() -> ata_sff_qc_issue()
  ata_pci_default_filter() -> ata_bmdma_mode_filter()
  ata_dev_try_classify() -> ata_sff_dev_classify()

This rename is in preparation of separating SFF support out of libata
core layer.  This patch strictly renames functions and doesn't
introduce any behavior difference.

Signed-off-by: Tejun Heo <htejun@gmail.com>
diff --git a/drivers/ata/pata_ns87415.c b/drivers/ata/pata_ns87415.c
index cdd79d6..03a52ce 100644
--- a/drivers/ata/pata_ns87415.c
+++ b/drivers/ata/pata_ns87415.c
@@ -172,14 +172,14 @@
 }
 
 /**
- *	ns87415_bmdma_irq_clear		-	Clear interrupt
+ *	ns87415_irq_clear		-	Clear interrupt
  *	@ap: Channel to clear
  *
  *	Erratum: Due to a chip bug regisers 02 and 0A bit 1 and 2 (the
  *	error bits) are reset by writing to register 00 or 08.
  */
 
-static void ns87415_bmdma_irq_clear(struct ata_port *ap)
+static void ns87415_irq_clear(struct ata_port *ap)
 {
 	void __iomem *mmio = ap->ioaddr.bmdma_addr;
 
@@ -306,7 +306,7 @@
 	.bmdma_setup		= ns87415_bmdma_setup,
 	.bmdma_start		= ns87415_bmdma_start,
 	.bmdma_stop		= ns87415_bmdma_stop,
-	.irq_clear		= ns87415_bmdma_irq_clear,
+	.irq_clear		= ns87415_irq_clear,
 
 	.cable_detect		= ata_cable_40wire,
 	.set_piomode		= ns87415_set_piomode,
@@ -375,7 +375,7 @@
 	pci_write_config_byte(pdev, 0x55, 0xEE);
 	/* Select PIO0 8bit clocking */
 	pci_write_config_byte(pdev, 0x54, 0xB7);
-	return ata_pci_init_one(pdev, ppi, &ns87415_sht, NULL);
+	return ata_pci_sff_init_one(pdev, ppi, &ns87415_sht, NULL);
 }
 
 static const struct pci_device_id ns87415_pci_tbl[] = {