diff options
Diffstat (limited to 'drivers/ata/sata_mv.c')
| -rw-r--r-- | drivers/ata/sata_mv.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c index 47184567248d..8a751054c8a1 100644 --- a/drivers/ata/sata_mv.c +++ b/drivers/ata/sata_mv.c @@ -251,6 +251,11 @@ enum { HC_IRQ_COAL_IO_THRESHOLD_OFS = 0x000c, HC_IRQ_COAL_TIME_THRESHOLD_OFS = 0x0010, + SOC_LED_CTRL_OFS = 0x2c, + SOC_LED_CTRL_BLINK = (1 << 0), /* Active LED blink */ + SOC_LED_CTRL_ACT_PRESENCE = (1 << 2), /* Multiplex dev presence */ + /* with dev activity LED */ + /* Shadow block registers */ SHD_BLK_OFS = 0x100, SHD_CTL_AST_OFS = 0x20, /* ofs from SHD_BLK_OFS */ @@ -411,6 +416,7 @@ enum { MV_HP_PCIE = (1 << 9), /* PCIe bus/regs: 7042 */ MV_HP_CUT_THROUGH = (1 << 10), /* can use EDMA cut-through */ MV_HP_FLAG_SOC = (1 << 11), /* SystemOnChip, no PCI */ + MV_HP_QUIRK_LED_BLINK_EN = (1 << 12), /* is led blinking enabled? */ /* Port private flags (pp_flags) */ MV_PP_FLAG_EDMA_EN = (1 << 0), /* is EDMA engine enabled? */ @@ -1404,6 +1410,61 @@ static void mv_bmdma_enable_iie(struct ata_port *ap, int enable_bmdma) mv_write_cached_reg(mv_ap_base(ap) + EDMA_UNKNOWN_RSVD_OFS, old, new); } +/* + * SOC chips have an issue whereby the HDD LEDs don't always blink + * during I/O when NCQ is enabled. Enabling a special "LED blink" mode + * of the SOC takes care of it, generating a steady blink rate when + * any drive on the chip is active. + * + * Unfortunately, the blink mode is a global hardware setting for the SOC, + * so we must use it whenever at least one port on the SOC has NCQ enabled. + * + * We turn "LED blink" off when NCQ is not in use anywhere, because the normal + * LED operation works then, and provides better (more accurate) feedback. + * + * Note that this code assumes that an SOC never has more than one HC onboard. + */ +static void mv_soc_led_blink_enable(struct ata_port *ap) +{ + struct ata_host *host = ap->host; + struct mv_host_priv *hpriv = host->private_data; + void __iomem *hc_mmio; + u32 led_ctrl; + + if (hpriv->hp_flags & MV_HP_QUIRK_LED_BLINK_EN) + return; + hpriv->hp_flags |= MV_HP_QUIRK_LED_BLINK_EN; + hc_mmio = mv_hc_base_from_port(mv_host_base(host), ap->port_no); + led_ctrl = readl(hc_mmio + SOC_LED_CTRL_OFS); + writel(led_ctrl | SOC_LED_CTRL_BLINK, hc_mmio + SOC_LED_CTRL_OFS); +} + +static void mv_soc_led_blink_disable(struct ata_port *ap) +{ + struct ata_host *host = ap->host; + struct mv_host_priv *hpriv = host->private_data; + void __iomem *hc_mmio; + u32 led_ctrl; + unsigned int port; + + if (!(hpriv->hp_flags & MV_HP_QUIRK_LED_BLINK_EN)) + return; + + /* disable led-blink only if no ports are using NCQ */ + for (port = 0; port < hpriv->n_ports; port++) { + struct ata_port *this_ap = host->ports[port]; + struct mv_port_priv *pp = this_ap->private_data; + + if (pp->pp_flags & MV_PP_FLAG_NCQ_EN) + return; + } + + hpriv->hp_flags &= ~MV_HP_QUIRK_LED_BLINK_EN; + hc_mmio = mv_hc_base_from_port(mv_host_base(host), ap->port_no); + led_ctrl = readl(hc_mmio + SOC_LED_CTRL_OFS); + writel(led_ctrl & ~SOC_LED_CTRL_BLINK, hc_mmio + SOC_LED_CTRL_OFS); +} + static void mv_edma_cfg(struct ata_port *ap, int want_ncq, int want_edma) { u32 cfg; @@ -1451,6 +1512,13 @@ static void mv_edma_cfg(struct ata_port *ap, int want_ncq, int want_edma) if (hpriv->hp_flags & MV_HP_CUT_THROUGH) cfg |= (1 << 17); /* enab cut-thru (dis stor&forwrd) */ mv_bmdma_enable_iie(ap, !want_edma); + + if (IS_SOC(hpriv)) { + if (want_ncq) + mv_soc_led_blink_enable(ap); + else + mv_soc_led_blink_disable(ap); + } } if (want_ncq) { |