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[libata] sata_mv: minor cleanups 

* trim trailing whitespace
* document some flags, registers, and register bits
* fix locking around EDMA on/off and configuration
* continue replacing "constant OP var" with "var OP constant"
* use new pci_try_set_mwi()

Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jeff Garzik 2007-07-13 17:06:45 -04:00
parent 6c1153e00a
commit 0ea9e179f4
1 changed files with 38 additions and 24 deletions
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56
drivers/ata/sata_mv.c
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@ -35,8 +35,6 @@
6) Add port multiplier support (intermediate)
7) Test and verify 3.0 Gbps support
8) Develop a low-power-consumption strategy, and implement it.
9) [Experiment, low priority] See if ATAPI can be supported using
@ -286,10 +284,10 @@ enum {
EDMA_RSP_Q_OUT_PTR_OFS = 0x24, /* also contains BASE_LO */
EDMA_RSP_Q_PTR_SHIFT = 3,
EDMA_CMD_OFS = 0x28,
EDMA_EN = (1 << 0),
EDMA_DS = (1 << 1),
ATA_RST = (1 << 2),
EDMA_CMD_OFS = 0x28, /* EDMA command register */
EDMA_EN = (1 << 0), /* enable EDMA */
EDMA_DS = (1 << 1), /* disable EDMA; self-negated */
ATA_RST = (1 << 2), /* reset trans/link/phy */
EDMA_IORDY_TMOUT = 0x34,
EDMA_ARB_CFG = 0x38,
@ -301,14 +299,13 @@ enum {
MV_HP_ERRATA_60X1B2 = (1 << 3),
MV_HP_ERRATA_60X1C0 = (1 << 4),
MV_HP_ERRATA_XX42A0 = (1 << 5),
MV_HP_GEN_I = (1 << 6),
MV_HP_GEN_II = (1 << 7),
MV_HP_GEN_IIE = (1 << 8),
MV_HP_GEN_I = (1 << 6), /* Generation I: 50xx */
MV_HP_GEN_II = (1 << 7), /* Generation II: 60xx */
MV_HP_GEN_IIE = (1 << 8), /* Generation IIE: 6042/7042 */
/* Port private flags (pp_flags) */
MV_PP_FLAG_EDMA_EN = (1 << 0),
MV_PP_FLAG_EDMA_DS_ACT = (1 << 1),
MV_PP_FLAG_HAD_A_RESET = (1 << 2),
MV_PP_FLAG_EDMA_EN = (1 << 0), /* is EDMA engine enabled? */
MV_PP_FLAG_HAD_A_RESET = (1 << 2), /* 1st hard reset complete? */
};
#define IS_GEN_I(hpriv) ((hpriv)->hp_flags & MV_HP_GEN_I)
@ -318,8 +315,12 @@ enum {
enum {
MV_DMA_BOUNDARY = 0xffffffffU,
/* mask of register bits containing lower 32 bits
* of EDMA request queue DMA address
*/
EDMA_REQ_Q_BASE_LO_MASK = 0xfffffc00U,
/* ditto, for response queue */
EDMA_RSP_Q_BASE_LO_MASK = 0xffffff00U,
};
@ -823,7 +824,7 @@ static void mv_start_dma(void __iomem *base, struct mv_host_priv *hpriv,
}
/**
* mv_stop_dma - Disable eDMA engine
* __mv_stop_dma - Disable eDMA engine
* @ap: ATA channel to manipulate
*
* Verify the local cache of the eDMA state is accurate with a
@ -832,7 +833,7 @@ static void mv_start_dma(void __iomem *base, struct mv_host_priv *hpriv,
* LOCKING:
* Inherited from caller.
*/
static int mv_stop_dma(struct ata_port *ap)
static int __mv_stop_dma(struct ata_port *ap)
{
void __iomem *port_mmio = mv_ap_base(ap);
struct mv_port_priv *pp = ap->private_data;
@ -865,6 +866,18 @@ static int mv_stop_dma(struct ata_port *ap)
return err;
}
static int mv_stop_dma(struct ata_port *ap)
{
unsigned long flags;
int rc;
spin_lock_irqsave(&ap->host->lock, flags);
rc = __mv_stop_dma(ap);
spin_unlock_irqrestore(&ap->host->lock, flags);
return rc;
}
#ifdef ATA_DEBUG
static void mv_dump_mem(void __iomem *start, unsigned bytes)
{
@ -965,7 +978,7 @@ static u32 mv_scr_read(struct ata_port *ap, unsigned int sc_reg_in)
{
unsigned int ofs = mv_scr_offset(sc_reg_in);
if (0xffffffffU != ofs)
if (ofs != 0xffffffffU)
return readl(mv_ap_base(ap) + ofs);
else
return (u32) ofs;
@ -975,7 +988,7 @@ static void mv_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val)
{
unsigned int ofs = mv_scr_offset(sc_reg_in);
if (0xffffffffU != ofs)
if (ofs != 0xffffffffU)
writelfl(val, mv_ap_base(ap) + ofs);
}
@ -1029,6 +1042,7 @@ static int mv_port_start(struct ata_port *ap)
void __iomem *port_mmio = mv_ap_base(ap);
void *mem;
dma_addr_t mem_dma;
unsigned long flags;
int rc;
pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
@ -1067,10 +1081,14 @@ static int mv_port_start(struct ata_port *ap)
pp->sg_tbl = mem;
pp->sg_tbl_dma = mem_dma;
spin_lock_irqsave(&ap->host->lock, flags);
mv_edma_cfg(ap, hpriv, port_mmio);
mv_set_edma_ptrs(port_mmio, hpriv, pp);
spin_unlock_irqrestore(&ap->host->lock, flags);
/* Don't turn on EDMA here...do it before DMA commands only. Else
* we'll be unable to send non-data, PIO, etc due to restricted access
* to shadow regs.
@ -1090,11 +1108,7 @@ static int mv_port_start(struct ata_port *ap)
*/
static void mv_port_stop(struct ata_port *ap)
{
unsigned long flags;
spin_lock_irqsave(&ap->host->lock, flags);
mv_stop_dma(ap);
spin_unlock_irqrestore(&ap->host->lock, flags);
}
/**
@ -1325,7 +1339,7 @@ static unsigned int mv_qc_issue(struct ata_queued_cmd *qc)
* port. Turn off EDMA so there won't be problems accessing
* shadow block, etc registers.
*/
mv_stop_dma(ap);
__mv_stop_dma(ap);
return ata_qc_issue_prot(qc);
}