From 4e5ec5dba22ea509b1a004f9815751f0ffc815e5 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Mon, 27 Mar 2006 18:42:40 +0100 Subject: [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 --- drivers/scsi/libata-bmdma.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) (limited to 'drivers') diff --git a/drivers/scsi/libata-bmdma.c b/drivers/scsi/libata-bmdma.c index 95d81d86d8b7..835dff0bafdc 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; -- cgit v1.2.3