libata-sff: clean up inheritance in several drivers

1. pata_cmd640 is PIO only.  Inherit from sff.

2. pata_macio is BMDMA.  Inherit from bmdma and drop explicit
   bmdma_mode_filter() setting.

3. In sata_mv, unlike mv5, mv6 is BMDMA.  Inherit from bmdma and
   don't clear ->post_internal_cmd().

4. bf54x and icside are quasi-BMDMA controllers which don't use the
   standard BMDMA registers so they don't initialize bmdma_addr and
   inherit from sff to avoid the default mode_filter which disables
   DMA modes if bmdma_addr is not initialized.

For 2 and 3, this patch makes the drivers explicitly specify
->mode_filter to ATA_OP_NULL while inheriting from ata_bmdma_port_ops.
These will be removed by the next patch.

This patch makes all and only BMDMA drivers inherit from
ata_bmdma_port_ops to ease further SFF/BMDMA separation.

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

drivers/ata/pata_bf54x.c

@@ -1421,7 +1421,7 @@ static struct scsi_host_template bfin_sht = {
 };
 
 static struct ata_port_operations bfin_pata_ops = {
-	.inherits		= &ata_sff_port_ops,
+	.inherits		= &ata_bmdma_port_ops,
 
 	.set_piomode		= bfin_set_piomode,
 	.set_dmamode		= bfin_set_dmamode,
@@ -1450,6 +1450,8 @@ static struct ata_port_operations bfin_pata_ops = {
 
 	.port_start		= bfin_port_start,
 	.port_stop		= bfin_port_stop,
+
+	.mode_filter		= ATA_OP_NULL,	/* will be removed soon */
 };
 
 static struct ata_port_info bfin_port_info[] = {

drivers/ata/pata_cmd640.c

@@ -166,11 +166,11 @@ static int cmd640_port_start(struct ata_port *ap)
 }
 
 static struct scsi_host_template cmd640_sht = {
-	ATA_BMDMA_SHT(DRV_NAME),
+	ATA_PIO_SHT(DRV_NAME),
 };
 
 static struct ata_port_operations cmd640_port_ops = {
-	.inherits	= &ata_bmdma_port_ops,
+	.inherits	= &ata_sff_port_ops,
 	/* In theory xfer_noirq is not needed once we kill the prefetcher */
 	.sff_data_xfer	= ata_sff_data_xfer_noirq,
 	.qc_issue	= cmd640_qc_issue,

drivers/ata/pata_icside.c

@@ -321,7 +321,7 @@ static void pata_icside_postreset(struct ata_link *link, unsigned int *classes)
 }
 
 static struct ata_port_operations pata_icside_port_ops = {
-	.inherits		= &ata_sff_port_ops,
+	.inherits		= &ata_bmdma_port_ops,
 	/* no need to build any PRD tables for DMA */
 	.qc_prep		= ata_noop_qc_prep,
 	.sff_data_xfer		= ata_sff_data_xfer_noirq,
@@ -334,6 +334,8 @@ static struct ata_port_operations pata_icside_port_ops = {
 	.set_dmamode		= pata_icside_set_dmamode,
 	.postreset		= pata_icside_postreset,
 	.post_internal_cmd	= pata_icside_bmdma_stop,
+
+	.mode_filter		= ATA_OP_NULL,	/* will be removed soon */
 };
 
 static void __devinit

drivers/ata/pata_macio.c

@@ -917,15 +917,14 @@ static struct scsi_host_template pata_macio_sht = {
 };
 
 static struct ata_port_operations pata_macio_ops = {
-	.inherits		= &ata_sff_port_ops,
+	.inherits		= &ata_bmdma_port_ops,
 
 	.freeze			= pata_macio_freeze,
 	.set_piomode		= pata_macio_set_timings,
 	.set_dmamode		= pata_macio_set_timings,
 	.cable_detect		= pata_macio_cable_detect,
 	.sff_dev_select		= pata_macio_dev_select,
 	.qc_prep		= pata_macio_qc_prep,
-	.mode_filter		= ata_bmdma_mode_filter,
 	.bmdma_setup		= pata_macio_bmdma_setup,
 	.bmdma_start		= pata_macio_bmdma_start,
 	.bmdma_stop		= pata_macio_bmdma_stop,

drivers/ata/sata_mv.c

@@ -686,23 +686,39 @@ static struct ata_port_operations mv5_ops = {
 };
 
 static struct ata_port_operations mv6_ops = {
-	.inherits		= &mv5_ops,
+	.inherits		= &ata_bmdma_port_ops,
+
+	.lost_interrupt		= ATA_OP_NULL,
+
+	.qc_defer		= mv_qc_defer,
+	.qc_prep		= mv_qc_prep,
+	.qc_issue		= mv_qc_issue,
+
 	.dev_config             = mv6_dev_config,
-	.scr_read		= mv_scr_read,
-	.scr_write		= mv_scr_write,
 
+	.freeze			= mv_eh_freeze,
+	.thaw			= mv_eh_thaw,
+	.hardreset		= mv_hardreset,
+	.softreset		= mv_softreset,
 	.pmp_hardreset		= mv_pmp_hardreset,
 	.pmp_softreset		= mv_softreset,
-	.softreset		= mv_softreset,
 	.error_handler		= mv_pmp_error_handler,
 
+	.scr_read		= mv_scr_read,
+	.scr_write		= mv_scr_write,
+
 	.sff_check_status	= mv_sff_check_status,
 	.sff_irq_clear		= mv_sff_irq_clear,
 	.check_atapi_dma	= mv_check_atapi_dma,
 	.bmdma_setup		= mv_bmdma_setup,
 	.bmdma_start		= mv_bmdma_start,
 	.bmdma_stop		= mv_bmdma_stop,
 	.bmdma_status		= mv_bmdma_status,
+
+	.port_start		= mv_port_start,
+	.port_stop		= mv_port_stop,
+
+	.mode_filter            = ATA_OP_NULL,  /* will be removed soon */
 };
 
 static struct ata_port_operations mv_iie_ops = {