From 05944bdf6fadb5394710269df6770dde447b23ca Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Wed, 13 Aug 2008 20:19:09 +0900 Subject: libata: implement no[hs]rst force params Implement force params nohrst, nosrst and norst. This is to work around reset related problems and ease debugging. Signed-off-by: Tejun Heo Signed-off-by: Jeff Garzik --- include/linux/libata.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include') diff --git a/include/linux/libata.h b/include/linux/libata.h index 06b80337303..5340d4c83fd 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -163,6 +163,7 @@ enum { ATA_DEV_NONE = 9, /* no device */ /* struct ata_link flags */ + ATA_LFLAG_NO_HRST = (1 << 1), /* avoid hardreset */ ATA_LFLAG_NO_SRST = (1 << 2), /* avoid softreset */ ATA_LFLAG_ASSUME_ATA = (1 << 3), /* assume ATA class */ ATA_LFLAG_ASSUME_SEMB = (1 << 4), /* assume SEMB class */ -- cgit v1.2.3 From d127ea7b8643a93d14d1f3c542974407f14d3663 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Thu, 31 Jul 2008 16:09:34 +0900 Subject: libata: restore SControl on detach Save SControl during probing and restore it on detach. This prevents adjustments made by libata drivers to seep into the next driver which gets attached (be it a libata one or not). It's not clear whether SControl also needs to be restored on suspend. The next system to have control (ACPI or kexec'd kernel) would probably like to see the original SControl value but there's no guarantee that a link is gonna keep working after SControl is adjusted without a reset and adding a reset and modified recovery cycle soley for this is an overkill. For now, do it only for detach. Signed-off-by: Tejun Heo Signed-off-by: Jeff Garzik --- drivers/ata/libata-core.c | 10 +++++----- include/linux/libata.h | 1 + 2 files changed, 6 insertions(+), 5 deletions(-) (limited to 'include') diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index dddcb9fde35..5f8f57a818f 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -5199,15 +5199,14 @@ void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp) */ int sata_link_init_spd(struct ata_link *link) { - u32 scontrol; u8 spd; int rc; - rc = sata_scr_read(link, SCR_CONTROL, &scontrol); + rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol); if (rc) return rc; - spd = (scontrol >> 4) & 0xf; + spd = (link->saved_scontrol >> 4) & 0xf; if (spd) link->hw_sata_spd_limit &= (1 << spd) - 1; @@ -5794,9 +5793,10 @@ static void ata_port_detach(struct ata_port *ap) ata_port_wait_eh(ap); /* EH is now guaranteed to see UNLOADING - EH context belongs - * to us. Disable all existing devices. + * to us. Restore SControl and disable all existing devices. */ - ata_port_for_each_link(link, ap) { + __ata_port_for_each_link(link, ap) { + sata_scr_write(link, SCR_CONTROL, link->saved_scontrol); ata_link_for_each_dev(dev, link) ata_dev_disable(dev); } diff --git a/include/linux/libata.h b/include/linux/libata.h index 5340d4c83fd..80233fdc159 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -647,6 +647,7 @@ struct ata_link { unsigned int flags; /* ATA_LFLAG_xxx */ + u32 saved_scontrol; /* SControl on probe */ unsigned int hw_sata_spd_limit; unsigned int sata_spd_limit; unsigned int sata_spd; /* current SATA PHY speed */ -- cgit v1.2.3 From b15b3ebae102f89c25ccbcae0b2099af312f2e82 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Fri, 1 Aug 2008 09:18:34 +0100 Subject: libata: Fix a large collection of DMA mode mismatches MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Dave Müller sent a diff for the pata_oldpiix that highlighted a problem where a lot of the ATA drivers assume dma_mode == 0 means "no DMA" while the core code uses 0xFF. This turns out to have other consequences such as code doing >= XFER_UDMA_0 also catching 0xFF as UDMAlots. Fortunately it doesn't generally affect set_dma_mode, although some drivers call back into their own set mode code from other points. Having been through the drivers I've added helpers for using_udma/using_mwdma dma_enabled so that people don't open code ranges that may change (eg if UDMA8 appears somewhere) Thanks to David for the initial bits [and added fix for pata_oldpiix from and signed-off-by Dave Mueller -jg] Signed-off-by: Alan Cox Signed-off-by: Jeff Garzik --- drivers/ata/libata-core.c | 4 ++-- drivers/ata/pata_acpi.c | 2 +- drivers/ata/pata_atiixp.c | 2 +- drivers/ata/pata_cs5530.c | 6 +++--- drivers/ata/pata_oldpiix.c | 2 +- drivers/ata/pata_sc1200.c | 6 +++--- include/linux/libata.h | 22 ++++++++++++++++++++++ 7 files changed, 33 insertions(+), 11 deletions(-) (limited to 'include') diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 5f8f57a818f..79e3a8e7a84 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -3288,7 +3288,7 @@ int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev) dev->dma_mode = ata_xfer_mask2mode(dma_mask); found = 1; - if (dev->dma_mode != 0xff) + if (ata_dma_enabled(dev)) used_dma = 1; } if (!found) @@ -3313,7 +3313,7 @@ int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev) /* step 3: set host DMA timings */ ata_link_for_each_dev(dev, link) { - if (!ata_dev_enabled(dev) || dev->dma_mode == 0xff) + if (!ata_dev_enabled(dev) || !ata_dma_enabled(dev)) continue; dev->xfer_mode = dev->dma_mode; diff --git a/drivers/ata/pata_acpi.c b/drivers/ata/pata_acpi.c index fbe60571155..eb919c16a03 100644 --- a/drivers/ata/pata_acpi.c +++ b/drivers/ata/pata_acpi.c @@ -181,7 +181,7 @@ static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc) if (adev != acpi->last) { pacpi_set_piomode(ap, adev); - if (adev->dma_mode) + if (ata_dma_enabled(adev)) pacpi_set_dmamode(ap, adev); acpi->last = adev; } diff --git a/drivers/ata/pata_atiixp.c b/drivers/ata/pata_atiixp.c index d7de7baf58a..e8a0d99d735 100644 --- a/drivers/ata/pata_atiixp.c +++ b/drivers/ata/pata_atiixp.c @@ -183,7 +183,7 @@ static void atiixp_bmdma_start(struct ata_queued_cmd *qc) u16 tmp16; pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16); - if (adev->dma_mode >= XFER_UDMA_0) + if (ata_using_udma(adev)) tmp16 |= (1 << dn); else tmp16 &= ~(1 << dn); diff --git a/drivers/ata/pata_cs5530.c b/drivers/ata/pata_cs5530.c index 744beebaaf4..0c4b271a9d5 100644 --- a/drivers/ata/pata_cs5530.c +++ b/drivers/ata/pata_cs5530.c @@ -149,10 +149,10 @@ static unsigned int cs5530_qc_issue(struct ata_queued_cmd *qc) struct ata_device *prev = ap->private_data; /* See if the DMA settings could be wrong */ - if (adev->dma_mode != 0 && adev != prev && prev != NULL) { + if (ata_dma_enabled(adev) && adev != prev && prev != NULL) { /* Maybe, but do the channels match MWDMA/UDMA ? */ - if ((adev->dma_mode >= XFER_UDMA_0 && prev->dma_mode < XFER_UDMA_0) || - (adev->dma_mode < XFER_UDMA_0 && prev->dma_mode >= XFER_UDMA_0)) + if ((ata_using_udma(adev) && !ata_using_udma(prev)) || + (ata_using_udma(prev) && !ata_using_udma(adev))) /* Switch the mode bits */ cs5530_set_dmamode(ap, adev); } diff --git a/drivers/ata/pata_oldpiix.c b/drivers/ata/pata_oldpiix.c index e678af383d1..df64f244300 100644 --- a/drivers/ata/pata_oldpiix.c +++ b/drivers/ata/pata_oldpiix.c @@ -198,7 +198,7 @@ static unsigned int oldpiix_qc_issue(struct ata_queued_cmd *qc) if (adev != ap->private_data) { oldpiix_set_piomode(ap, adev); - if (adev->dma_mode) + if (ata_dma_enabled(adev)) oldpiix_set_dmamode(ap, adev); } return ata_sff_qc_issue(qc); diff --git a/drivers/ata/pata_sc1200.c b/drivers/ata/pata_sc1200.c index cbab397e3db..0278fd2b8fb 100644 --- a/drivers/ata/pata_sc1200.c +++ b/drivers/ata/pata_sc1200.c @@ -167,10 +167,10 @@ static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc) struct ata_device *prev = ap->private_data; /* See if the DMA settings could be wrong */ - if (adev->dma_mode != 0 && adev != prev && prev != NULL) { + if (ata_dma_enabled(adev) && adev != prev && prev != NULL) { /* Maybe, but do the channels match MWDMA/UDMA ? */ - if ((adev->dma_mode >= XFER_UDMA_0 && prev->dma_mode < XFER_UDMA_0) || - (adev->dma_mode < XFER_UDMA_0 && prev->dma_mode >= XFER_UDMA_0)) + if ((ata_using_udma(adev) && !ata_using_udma(prev)) || + (ata_using_udma(prev) && !ata_using_udma(adev))) /* Switch the mode bits */ sc1200_set_dmamode(ap, adev); } diff --git a/include/linux/libata.h b/include/linux/libata.h index 80233fdc159..225bfc5bd9e 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -1429,6 +1429,28 @@ static inline unsigned long ata_deadline(unsigned long from_jiffies, return from_jiffies + msecs_to_jiffies(timeout_msecs); } +/* Don't open code these in drivers as there are traps. Firstly the range may + change in future hardware and specs, secondly 0xFF means 'no DMA' but is + > UDMA_0. Dyma ddreigiau */ + +static inline int ata_using_mwdma(struct ata_device *adev) +{ + if (adev->dma_mode >= XFER_MW_DMA_0 && adev->dma_mode <= XFER_MW_DMA_4) + return 1; + return 0; +} + +static inline int ata_using_udma(struct ata_device *adev) +{ + if (adev->dma_mode >= XFER_UDMA_0 && adev->dma_mode <= XFER_UDMA_7) + return 1; + return 0; +} + +static inline int ata_dma_enabled(struct ata_device *adev) +{ + return (adev->dma_mode == 0xFF ? 0 : 1); +} /************************************************************************** * PMP - drivers/ata/libata-pmp.c -- cgit v1.2.3