From: Alan Cox Date: Mon, 27 Mar 2006 17:42:40 +0000 (+0100) Subject: [PATCH] libata: BMDMA handling updates X-Git-Tag: v2.6.17-rc1~146^2~6 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e5ec5dba22ea509b1a004f9815751f0ffc815e5;p=linux-2.6 [PATCH] libata: BMDMA handling updates This is the minimal patch set to enable the current code to be used with a controller following SFF (ie any PATA and early SATA controllers) safely without crashes if there is no BMDMA area or if BMDMA is not assigned by the BIOS for some reason. Simplex status is recorded but not acted upon in this change, this isn't a problem with the current drivers as none of them are for simplex hardware. A following diff will deal with that. The flags in the probe structure remain ->host_set_flags although Jeff asked me to rename them, simply because the rename would break the usual Linux rules that old code should break when there are changes. not compile and run and then blow up/eat your computer/etc. Renaming this later is a trivial exercise once a better name is chosen. Signed-off-by: Jeff Garzik --- diff --git a/drivers/scsi/libata-bmdma.c b/drivers/scsi/libata-bmdma.c index 95d81d86d8..835dff0baf 100644 --- a/drivers/scsi/libata-bmdma.c +++ b/drivers/scsi/libata-bmdma.c @@ -703,6 +703,7 @@ ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int struct ata_probe_ent *probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]); int p = 0; + unsigned long bmdma; if (!probe_ent) return NULL; @@ -716,7 +717,12 @@ ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int probe_ent->port[p].altstatus_addr = probe_ent->port[p].ctl_addr = pci_resource_start(pdev, 1) | ATA_PCI_CTL_OFS; - probe_ent->port[p].bmdma_addr = pci_resource_start(pdev, 4); + bmdma = pci_resource_start(pdev, 4); + if (bmdma) { + if (inb(bmdma + 2) & 0x80) + probe_ent->host_set_flags |= ATA_HOST_SIMPLEX; + probe_ent->port[p].bmdma_addr = bmdma; + } ata_std_ports(&probe_ent->port[p]); p++; } @@ -726,7 +732,13 @@ ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int probe_ent->port[p].altstatus_addr = probe_ent->port[p].ctl_addr = pci_resource_start(pdev, 3) | ATA_PCI_CTL_OFS; - probe_ent->port[p].bmdma_addr = pci_resource_start(pdev, 4) + 8; + bmdma = pci_resource_start(pdev, 4); + if (bmdma) { + bmdma += 8; + if(inb(bmdma + 2) & 0x80) + probe_ent->host_set_flags |= ATA_HOST_SIMPLEX; + probe_ent->port[p].bmdma_addr = bmdma; + } ata_std_ports(&probe_ent->port[p]); p++; } @@ -740,6 +752,7 @@ static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev, struct ata_port_info *port, int port_num) { struct ata_probe_ent *probe_ent; + unsigned long bmdma; probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port); if (!probe_ent) @@ -766,8 +779,13 @@ static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev, break; } - probe_ent->port[0].bmdma_addr = - pci_resource_start(pdev, 4) + 8 * port_num; + bmdma = pci_resource_start(pdev, 4); + if (bmdma != 0) { + bmdma += 8 * port_num; + probe_ent->port[0].bmdma_addr = bmdma; + if (inb(bmdma + 2) & 0x80) + probe_ent->host_set_flags |= ATA_HOST_SIMPLEX; + } ata_std_ports(&probe_ent->port[0]); return probe_ent; diff --git a/include/linux/libata.h b/include/linux/libata.h index 9fcc061e3a..a5c213ce97 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -160,6 +160,9 @@ enum { ATA_QCFLAG_DMAMAP = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE, ATA_QCFLAG_EH_SCHEDULED = (1 << 5), /* EH scheduled */ + /* host set flags */ + ATA_HOST_SIMPLEX = (1 << 0), /* Host is simplex, one DMA channel per host_set only */ + /* various lengths of time */ ATA_TMOUT_PIO = 30 * HZ, ATA_TMOUT_BOOT = 30 * HZ, /* heuristic */ @@ -278,6 +281,7 @@ struct ata_probe_ent { unsigned long irq; unsigned int irq_flags; unsigned long host_flags; + unsigned long host_set_flags; void __iomem *mmio_base; void *private_data; };