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From: Alexander Motin <mav@FreeBSD.org>
Date: Thu, 17 Dec 2009 23:42:09 +0000 (UTC)
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Subject: svn commit: r200655 - head/sys/dev/ata/chipsets
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Author: mav
Date: Thu Dec 17 23:42:09 2009
New Revision: 200655
URL: http://svn.freebsd.org/changeset/base/200655

Log:
  Serverworks OSB4 has no 0x4a (piomode) register, do not touch it.
  Also OSB4 has some problems with UDMA transfers, limit it to WDMA2.

Modified:
  head/sys/dev/ata/chipsets/ata-serverworks.c

Modified: head/sys/dev/ata/chipsets/ata-serverworks.c
==============================================================================
--- head/sys/dev/ata/chipsets/ata-serverworks.c	Thu Dec 17 23:11:16 2009	(r200654)
+++ head/sys/dev/ata/chipsets/ata-serverworks.c	Thu Dec 17 23:42:09 2009	(r200655)
@@ -80,7 +80,7 @@ ata_serverworks_probe(device_t dev)
 {
     struct ata_pci_controller *ctlr = device_get_softc(dev);
     static struct ata_chip_id ids[] =
-    {{ ATA_ROSB4,     0x00, SWKS_33,  0, ATA_UDMA2, "ROSB4" },
+    {{ ATA_ROSB4,     0x00, SWKS_33,  0, ATA_WDMA2, "ROSB4" },
      { ATA_CSB5,      0x92, SWKS_100, 0, ATA_UDMA5, "CSB5" },
      { ATA_CSB5,      0x00, SWKS_66,  0, ATA_UDMA4, "CSB5" },
      { ATA_CSB6,      0x00, SWKS_100, 0, ATA_UDMA5, "CSB6" },
@@ -388,10 +388,12 @@ ata_serverworks_setmode(device_t dev, in
 	    piomode = mode;
 	}
 	/* Set PIO mode and timings, calculated above. */
-	pci_write_config(parent, 0x4a,
+	if (ctlr->chip->cfg1 != SWKS_33) {
+		pci_write_config(parent, 0x4a,
 			 (pci_read_config(parent, 0x4a, 2) &
 			  ~(0xf << (devno << 2))) |
 			 ((piomode - ATA_PIO0) << (devno<<2)),2);
+	}
 	pci_write_config(parent, 0x40, 
 			 (pci_read_config(parent, 0x40, 4) &
 			  ~(0xff << offset)) |