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sata_mv: optimize IRQ coalescing for 8-port chips 

Enable use of the "all ports" IRQ coalescing optimization
for GEN_II / GEN_IIE chips that have dual host-controllers (8-ports).
Currently only the 6081 chip qualifies, but other chips may come along someday.

Rather than each half of the chip having to satisfy a local set of coalescing thresholds,
use of this feature groups all ports together under a single set of thresholds.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Mark Lord 2009-03-11 00:56:00 -04:00 committed by Jeff Garzik
parent 2b748a0a34
commit 6abf467826
1 changed files with 18 additions and 14 deletions
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32
drivers/ata/sata_mv.c
View File

@ -1016,7 +1016,7 @@ static void mv_set_irq_coalescing(struct ata_host *host,
void __iomem *mmio = hpriv->base, *hc_mmio;
u32 coal_enable = 0;
unsigned long flags;
unsigned int clks;
unsigned int clks, is_dual_hc = hpriv->n_ports > MV_PORTS_PER_HC;
const u32 coal_disable = PORTS_0_3_COAL_DONE | PORTS_4_7_COAL_DONE |
ALL_PORTS_COAL_DONE;
@ -1033,37 +1033,41 @@ static void mv_set_irq_coalescing(struct ata_host *host,
}
spin_lock_irqsave(&host->lock, flags);
mv_set_main_irq_mask(host, coal_disable, 0);
#if 0 /* disabled pending functional clarification from Marvell */
if (!IS_GEN_I(hpriv)) {
if (is_dual_hc && !IS_GEN_I(hpriv)) {
/*
* GEN_II/GEN_IIE: global thresholds for the entire chip.
* GEN_II/GEN_IIE with dual host controllers:
* one set of global thresholds for the entire chip.
*/
writel(clks, mmio + MV_IRQ_COAL_TIME_THRESHOLD);
writel(count, mmio + MV_IRQ_COAL_IO_THRESHOLD);
/* clear leftover coal IRQ bit */
writelfl(~ALL_PORTS_COAL_IRQ, mmio + MV_IRQ_COAL_CAUSE);
clks = count = 0; /* so as to clear the alternate regs below */
coal_enable = ALL_PORTS_COAL_DONE;
writel(~ALL_PORTS_COAL_IRQ, mmio + MV_IRQ_COAL_CAUSE);
if (count)
coal_enable = ALL_PORTS_COAL_DONE;
clks = count = 0; /* force clearing of regular regs below */
}
#endif
/*
* All chips: independent thresholds for each HC on the chip.
*/
hc_mmio = mv_hc_base_from_port(mmio, 0);
writel(clks, hc_mmio + HC_IRQ_COAL_TIME_THRESHOLD_OFS);
writel(count, hc_mmio + HC_IRQ_COAL_IO_THRESHOLD_OFS);
coal_enable |= PORTS_0_3_COAL_DONE;
if (hpriv->n_ports > 4) {
writel(~HC_COAL_IRQ, hc_mmio + HC_IRQ_CAUSE_OFS);
if (count)
coal_enable |= PORTS_0_3_COAL_DONE;
if (is_dual_hc) {
hc_mmio = mv_hc_base_from_port(mmio, MV_PORTS_PER_HC);
writel(clks, hc_mmio + HC_IRQ_COAL_TIME_THRESHOLD_OFS);
writel(count, hc_mmio + HC_IRQ_COAL_IO_THRESHOLD_OFS);
coal_enable |= PORTS_4_7_COAL_DONE;
writel(~HC_COAL_IRQ, hc_mmio + HC_IRQ_CAUSE_OFS);
if (count)
coal_enable |= PORTS_4_7_COAL_DONE;
}
if (!count)
coal_enable = 0;
mv_set_main_irq_mask(host, coal_disable, coal_enable);
mv_set_main_irq_mask(host, 0, coal_enable);
spin_unlock_irqrestore(&host->lock, flags);
}