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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2008-12-11 16:37:06 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-12-11 16:37:06 +0000
commit5369bea7d7db1d95f63907f3470e23d32930be98 (patch)
treeb4d9fdf93c10a3f630f26ccad66437e2209ce102
parentf6718653361e8f8a6aac9946822aa2090edf4f37 (diff)
downloadop-kernel-dev-5369bea7d7db1d95f63907f3470e23d32930be98.zip
op-kernel-dev-5369bea7d7db1d95f63907f3470e23d32930be98.tar.gz
[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: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/mach-rpc/include/mach/isa-dma.h2
-rw-r--r--drivers/ata/pata_icside.c6
-rw-r--r--drivers/scsi/arm/cumana_2.c3
-rw-r--r--drivers/scsi/arm/eesox.c3
-rw-r--r--drivers/scsi/arm/powertec.c3
5 files changed, 10 insertions, 7 deletions
diff --git a/arch/arm/mach-rpc/include/mach/isa-dma.h b/arch/arm/mach-rpc/include/mach/isa-dma.h
index bad7205..67bfc67 100644
--- a/arch/arm/mach-rpc/include/mach/isa-dma.h
+++ b/arch/arm/mach-rpc/include/mach/isa-dma.h
@@ -23,5 +23,7 @@
#define DMA_FLOPPY DMA_VIRTUAL_FLOPPY
+#define IOMD_DMA_BOUNDARY (PAGE_SIZE - 1)
+
#endif /* _ASM_ARCH_DMA_H */
diff --git a/drivers/ata/pata_icside.c b/drivers/ata/pata_icside.c
index 63121f4..d7bc925 100644
--- a/drivers/ata/pata_icside.c
+++ b/drivers/ata/pata_icside.c
@@ -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)
diff --git a/drivers/scsi/arm/cumana_2.c b/drivers/scsi/arm/cumana_2.c
index 68a6412..8ee01b9 100644
--- a/drivers/scsi/arm/cumana_2.c
+++ b/drivers/scsi/arm/cumana_2.c
@@ -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",
diff --git a/drivers/scsi/arm/eesox.c b/drivers/scsi/arm/eesox.c
index bb2477b..d843513 100644
--- a/drivers/scsi/arm/eesox.c
+++ b/drivers/scsi/arm/eesox.c
@@ -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",
diff --git a/drivers/scsi/arm/powertec.c b/drivers/scsi/arm/powertec.c
index d9a546d..e2297b4 100644
--- a/drivers/scsi/arm/powertec.c
+++ b/drivers/scsi/arm/powertec.c
@@ -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",
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