Rearrange mv_start_dma() and friends, in preparation for adding non-EDMA DMA modes, and non-EDMA interrupts, to the driver. Signed-off-by: Mark Lord <mlord@xxxxxxxxx> --- old/drivers/ata/sata_mv.c 2009-01-30 16:45:20.000000000 -0500 +++ linux/drivers/ata/sata_mv.c 2009-01-30 16:44:12.000000000 -0500 @@ -536,7 +536,7 @@ unsigned int port_no); static int mv_stop_edma(struct ata_port *ap); static int mv_stop_edma_engine(void __iomem *port_mmio); -static void mv_edma_cfg(struct ata_port *ap, int want_ncq); +static void mv_edma_cfg(struct ata_port *ap, int want_ncq, int want_edma); static void mv_pmp_select(struct ata_port *ap, int pmp); static int mv_pmp_hardreset(struct ata_link *link, unsigned int *class, @@ -849,8 +849,32 @@ mv_set_main_irq_mask(ap->host, disable_bits, enable_bits); } +static void mv_clear_and_enable_port_irqs(struct ata_port *ap, + void __iomem *port_mmio, + unsigned int port_irqs) +{ + struct mv_host_priv *hpriv = ap->host->private_data; + int hardport = mv_hardport_from_port(ap->port_no); + void __iomem *hc_mmio = mv_hc_base_from_port( + mv_host_base(ap->host), ap->port_no); + u32 hc_irq_cause; + + /* clear EDMA event indicators, if any */ + writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS); + + /* clear pending irq events */ + hc_irq_cause = ~((DEV_IRQ | DMA_IRQ) << hardport); + writelfl(hc_irq_cause, hc_mmio + HC_IRQ_CAUSE_OFS); + + /* clear FIS IRQ Cause */ + if (IS_GEN_IIE(hpriv)) + writelfl(0, port_mmio + SATA_FIS_IRQ_CAUSE_OFS); + + mv_enable_port_irqs(ap, port_irqs); +} + /** - * mv_start_dma - Enable eDMA engine + * mv_start_edma - Enable eDMA engine * @base: port base address * @pp: port private data * @@ -860,7 +884,7 @@ * LOCKING: * Inherited from caller. */ -static void mv_start_dma(struct ata_port *ap, void __iomem *port_mmio, +static void mv_start_edma(struct ata_port *ap, void __iomem *port_mmio, struct mv_port_priv *pp, u8 protocol) { int want_ncq = (protocol == ATA_PROT_NCQ); @@ -872,26 +896,11 @@ } if (!(pp->pp_flags & MV_PP_FLAG_EDMA_EN)) { struct mv_host_priv *hpriv = ap->host->private_data; - int hardport = mv_hardport_from_port(ap->port_no); - void __iomem *hc_mmio = mv_hc_base_from_port( - mv_host_base(ap->host), ap->port_no); - u32 hc_irq_cause; - - /* clear EDMA event indicators, if any */ - writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS); - - /* clear pending irq events */ - hc_irq_cause = ~((DEV_IRQ | DMA_IRQ) << hardport); - writelfl(hc_irq_cause, hc_mmio + HC_IRQ_CAUSE_OFS); - mv_edma_cfg(ap, want_ncq); - - /* clear FIS IRQ Cause */ - if (IS_GEN_IIE(hpriv)) - writelfl(0, port_mmio + SATA_FIS_IRQ_CAUSE_OFS); + mv_edma_cfg(ap, want_ncq, 1); mv_set_edma_ptrs(port_mmio, hpriv, pp); - mv_enable_port_irqs(ap, DONE_IRQ|ERR_IRQ); + mv_clear_and_enable_port_irqs(ap, port_mmio, DONE_IRQ|ERR_IRQ); writelfl(EDMA_EN, port_mmio + EDMA_CMD_OFS); pp->pp_flags |= MV_PP_FLAG_EDMA_EN; @@ -1173,7 +1182,7 @@ writel(new, hpriv->base + MV_GPIO_PORT_CTL_OFS); } -static void mv_edma_cfg(struct ata_port *ap, int want_ncq) +static void mv_edma_cfg(struct ata_port *ap, int want_ncq, int want_edma) { u32 cfg; struct mv_port_priv *pp = ap->private_data; @@ -1182,7 +1191,7 @@ /* set up non-NCQ EDMA configuration */ cfg = EDMA_CFG_Q_DEPTH; /* always 0x1f for *all* chips */ - pp->pp_flags &= ~MV_PP_FLAG_FBS_EN; + pp->pp_flags &= ~(MV_PP_FLAG_FBS_EN | MV_PP_FLAG_NCQ_EN); if (IS_GEN_I(hpriv)) cfg |= (1 << 8); /* enab config burst size mask */ @@ -1211,9 +1220,11 @@ } cfg |= (1 << 23); /* do not mask PM field in rx'd FIS */ - cfg |= (1 << 22); /* enab 4-entry host queue cache */ - if (!IS_SOC(hpriv)) - cfg |= (1 << 18); /* enab early completion */ + if (want_edma) { + cfg |= (1 << 22); /* enab 4-entry host queue cache */ + if (!IS_SOC(hpriv)) + cfg |= (1 << 18); /* enab early completion */ + } if (hpriv->hp_flags & MV_HP_CUT_THROUGH) cfg |= (1 << 17); /* enab cut-thru (dis stor&forwrd) */ } @@ -1221,8 +1232,7 @@ if (want_ncq) { cfg |= EDMA_CFG_NCQ; pp->pp_flags |= MV_PP_FLAG_NCQ_EN; - } else - pp->pp_flags &= ~MV_PP_FLAG_NCQ_EN; + } writelfl(cfg, port_mmio + EDMA_CFG_OFS); } @@ -1591,7 +1601,7 @@ return ata_sff_qc_issue(qc); } - mv_start_dma(ap, port_mmio, pp, qc->tf.protocol); + mv_start_edma(ap, port_mmio, pp, qc->tf.protocol); pp->req_idx = (pp->req_idx + 1) & MV_MAX_Q_DEPTH_MASK; in_index = pp->req_idx << EDMA_REQ_Q_PTR_SHIFT; -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html