Commit 5369bea7 authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[ARM] dma: Use sensible DMA parameters for Acorn drivers 



The hardware supports transfers up to a page boundary per buffer.
Currently, we work around that in the DMA code by splitting each
buffer up as we run through the scatterlist.  Avoid this by telling
the block layers about the hardware restriction.

Eventually, this will allow us to phase out the splitting code,
but not until the old IDE layer allows us to control the value it
gives to blk_queue_segment_boundary().

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent f6718653

arch/arm/mach-rpc/include/mach/isa-dma.h

+2 −0
Original line number Diff line number Diff line
@@ -23,5 +23,7 @@ 


#define DMA_FLOPPY		DMA_VIRTUAL_FLOPPY



#define IOMD_DMA_BOUNDARY	(PAGE_SIZE - 1)



#endif /* _ASM_ARCH_DMA_H */

drivers/ata/pata_icside.c

+2 −4
Original line number Diff line number Diff line
@@ -45,8 +45,6 @@ static const struct portinfo pata_icside_portinfo_v6_2 = { 
	.stepping	= 6,

};



#define PATA_ICSIDE_MAX_SG	128



struct pata_icside_state {

	void __iomem *irq_port;

	void __iomem *ioc_base;
@@ -295,8 +293,8 @@ static int icside_dma_init(struct pata_icside_info *info) 


static struct scsi_host_template pata_icside_sht = {

	ATA_BASE_SHT(DRV_NAME),

	.sg_tablesize		= PATA_ICSIDE_MAX_SG,

	.dma_boundary		= ~0, /* no dma boundaries */

	.sg_tablesize		= SCSI_MAX_SG_CHAIN_SEGMENTS,

	.dma_boundary		= IOMD_DMA_BOUNDARY,

};



static void pata_icside_postreset(struct ata_link *link, unsigned int *classes)

drivers/scsi/arm/cumana_2.c

+2 −1
Original line number Diff line number Diff line
@@ -390,7 +390,8 @@ static struct scsi_host_template cumanascsi2_template = { 
	.eh_abort_handler		= fas216_eh_abort,

	.can_queue			= 1,

	.this_id			= 7,

	.sg_tablesize			= SG_ALL,

	.sg_tablesize			= SCSI_MAX_SG_CHAIN_SEGMENTS,

	.dma_boundary			= IOMD_DMA_BOUNDARY,

	.cmd_per_lun			= 1,

	.use_clustering			= DISABLE_CLUSTERING,

	.proc_name			= "cumanascsi2",

drivers/scsi/arm/eesox.c

+2 −1
Original line number Diff line number Diff line
@@ -508,7 +508,8 @@ static struct scsi_host_template eesox_template = { 
	.eh_abort_handler		= fas216_eh_abort,

	.can_queue			= 1,

	.this_id			= 7,

	.sg_tablesize			= SG_ALL,

	.sg_tablesize			= SCSI_MAX_SG_CHAIN_SEGMENTS,

	.dma_boundary			= IOMD_DMA_BOUNDARY,

	.cmd_per_lun			= 1,

	.use_clustering			= DISABLE_CLUSTERING,

	.proc_name			= "eesox",

drivers/scsi/arm/powertec.c

+2 −1
Original line number Diff line number Diff line
@@ -302,7 +302,8 @@ static struct scsi_host_template powertecscsi_template = { 


	.can_queue			= 8,

	.this_id			= 7,

	.sg_tablesize			= SG_ALL,

	.sg_tablesize			= SCSI_MAX_SG_CHAIN_SEGMENTS,

	.dma_boundary			= IOMD_DMA_BOUNDARY,

	.cmd_per_lun			= 2,

	.use_clustering			= ENABLE_CLUSTERING,

	.proc_name			= "powertec",

CRA Git | Maintained and supported by SUSTech CRA and CCSE