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libata-pmp: implement Port Multiplier support

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Implement Port Multiplier support.  To support PMP, a LLDD has to
supply ops->pmp_read() and pmp_write().  If non-null, ->pmp_attach and
->pmp_detach are called on PMP attach and detach, respectively.

->pmp_read/write() can be called while the port is frozen, so they
must be implemented by polling.  This patch supplies several helpers
to ease ->pmp_read/write() implementation.

Also, irq_handler and error_handler must be PMP aware.  Most of PMP
aware EH can be done by calling ata_pmp_do_eh() with appropriate
methods.  PMP EH uses separate set of reset methods and this patch
implements standard prereset, hardreset and postreset methods.

This patch only implements PMP support.  The next patch will integrate
PMP into the reset of libata and thus enable PMP support.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo
2007-09-23 13:19:54 +09:00
committed by Jeff Garzik
parent 3495de7336
commit 3af9a77af9
5 changed files with 1219 additions and 1 deletions
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11
drivers/ata/libata-core.c
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@ -3865,6 +3865,9 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
{ "IOMEGA ZIP 250 ATAPI", NULL, ATA_HORKAGE_NODMA }, /* temporary fix */
{ "IOMEGA ZIP 250 ATAPI Floppy",
NULL, ATA_HORKAGE_NODMA },
/* Odd clown on sil3726/4726 PMPs */
{ "Config Disk", NULL, ATA_HORKAGE_NODMA |
ATA_HORKAGE_SKIP_PM },
/* Weird ATAPI devices */
{ "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
@ -7251,6 +7254,14 @@ EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
#endif /* CONFIG_PCI */
EXPORT_SYMBOL_GPL(sata_pmp_read_init_tf);
EXPORT_SYMBOL_GPL(sata_pmp_read_val);
EXPORT_SYMBOL_GPL(sata_pmp_write_init_tf);
EXPORT_SYMBOL_GPL(sata_pmp_std_prereset);
EXPORT_SYMBOL_GPL(sata_pmp_std_hardreset);
EXPORT_SYMBOL_GPL(sata_pmp_std_postreset);
EXPORT_SYMBOL_GPL(sata_pmp_do_eh);
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);