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[PATCH] libata: BMDMA handling updates

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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 <jeff@garzik.org>
This commit is contained in:
Alan Cox 2006-03-27 18:42:40 +01:00 committed by Jeff Garzik
parent 05c8e0ac5c
commit 4e5ec5dba2
2 changed files with 26 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/scsi/libata-bmdma.c
View File

@ -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;

4
include/linux/libata.h
View File

@ -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;
};