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authorTejun Heo <htejun@gmail.com>2006-05-15 21:03:50 +0900
committerTejun Heo <htejun@gmail.com>2006-05-15 21:03:50 +0900
commitdd410ff12925fc49df3174b18e43598b2b2b621f (patch)
tree782f1127a074fbb70e90ac46b5e97e42aceddc9d /drivers/scsi/ahci.c
parenta6e6ce8e8dc907a2cf2b994b0ea4099423f046bf (diff)
downloadblackbird-op-linux-dd410ff12925fc49df3174b18e43598b2b2b621f.tar.gz
blackbird-op-linux-dd410ff12925fc49df3174b18e43598b2b2b621f.zip
[PATCH] ahci: clean up AHCI constants in preparation for NCQ
* Rename CMD_TBL_HDR to CMD_TBL_HDR_SZ as it's size not offset. * Define MAX_CMDS and CMD_SZ and use them in calculation of other constants. * Define CMD_TBL_AR_SZ as product of CMD_TBL_SZ and MAX_CMDS, and use it when calculating PRIV_DMA_SZ. * CMD_SLOT_SZ is also dependent on MAX_CMDS but hasn't been changed because I didn't want to change the value used by the original code (32 commands). Later NCQ change will bump MAX_CMDS to 32 anyway and the hard coded 32 can be changed to MAX_CMDS then. * Reorder HOST_CAP_* flags. Signed-off-by: Tejun Heo <htejun@gmail.com>
Diffstat (limited to 'drivers/scsi/ahci.c')
-rw-r--r--drivers/scsi/ahci.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index 35487e30b0ff..b25373f530ac 100644
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -56,12 +56,15 @@ enum {
AHCI_MAX_SG = 168, /* hardware max is 64K */
AHCI_DMA_BOUNDARY = 0xffffffff,
AHCI_USE_CLUSTERING = 0,
- AHCI_CMD_SLOT_SZ = 32 * 32,
+ AHCI_MAX_CMDS = 1,
+ AHCI_CMD_SZ = 32,
+ AHCI_CMD_SLOT_SZ = 32 * AHCI_CMD_SZ,
AHCI_RX_FIS_SZ = 256,
- AHCI_CMD_TBL_HDR = 0x80,
AHCI_CMD_TBL_CDB = 0x40,
- AHCI_CMD_TBL_SZ = AHCI_CMD_TBL_HDR + (AHCI_MAX_SG * 16),
- AHCI_PORT_PRIV_DMA_SZ = AHCI_CMD_SLOT_SZ + AHCI_CMD_TBL_SZ +
+ AHCI_CMD_TBL_HDR_SZ = 0x80,
+ AHCI_CMD_TBL_SZ = AHCI_CMD_TBL_HDR_SZ + (AHCI_MAX_SG * 16),
+ AHCI_CMD_TBL_AR_SZ = AHCI_CMD_TBL_SZ * AHCI_MAX_CMDS,
+ AHCI_PORT_PRIV_DMA_SZ = AHCI_CMD_SLOT_SZ + AHCI_CMD_TBL_AR_SZ +
AHCI_RX_FIS_SZ,
AHCI_IRQ_ON_SG = (1 << 31),
AHCI_CMD_ATAPI = (1 << 5),
@@ -89,8 +92,8 @@ enum {
HOST_AHCI_EN = (1 << 31), /* AHCI enabled */
/* HOST_CAP bits */
- HOST_CAP_64 = (1 << 31), /* PCI DAC (64-bit DMA) support */
HOST_CAP_CLO = (1 << 24), /* Command List Override support */
+ HOST_CAP_64 = (1 << 31), /* PCI DAC (64-bit DMA) support */
/* registers for each SATA port */
PORT_LST_ADDR = 0x00, /* command list DMA addr */
@@ -398,7 +401,7 @@ static int ahci_port_start(struct ata_port *ap)
pp->cmd_tbl = mem;
pp->cmd_tbl_dma = mem_dma;
- pp->cmd_tbl_sg = mem + AHCI_CMD_TBL_HDR;
+ pp->cmd_tbl_sg = mem + AHCI_CMD_TBL_HDR_SZ;
ap->private_data = pp;
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