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Date:      Tue, 19 Oct 1999 13:02:14 -0400 (EDT)
From:      Andrew Gallatin <gallatin@cs.duke.edu>
To:        sos@freebsd.org
Cc:        freebsd-alpha@freebsd.org
Subject:   ata busmaster i/o port on alpha
Message-ID:  <14348.40785.536064.278837@grasshopper.cs.duke.edu>
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Søren,

I'm trying to get the on-board IDE controllers in some AlphaServer
DS10 machines working well w/FreeBSD-current.  They use the Acer
AladdinV IDE controller in combination with a FUJITSU MPD3108AT ATA-4
disk.

The problem is with where the "Bios" (aka the SRM console) puts the
busmaster address:

<12:45pm>opal/root:~#pciconf -r 'pci0:13:0' 0x20
0x00010111

When you read the bus master address you mask off the upper 16 bits
entirely and we see the address as 0x110 where as it should really be 
0x10110.  When this happens, the disk is of course unusable.  After
5 retries, I see I/O errors when I try to access the disk.

If I apply the following patch, DMA works:

Index: ata-all.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/ata/ata-all.c,v
retrieving revision 1.28
diff -u -r1.28 ata-all.c
--- ata-all.c	1999/10/16 09:00:49	1.28
+++ ata-all.c	1999/10/19 16:51:36
@@ -262,9 +262,9 @@
 	irq1 = 14;
     } 
     else {
-	iobase_1 = pci_read_config(dev, 0x10, 4) & 0xfffc;
-	altiobase_1 = pci_read_config(dev, 0x14, 4) & 0xfffc;
-	bmaddr_1 = pci_read_config(dev, 0x20, 4) & 0xfffc;
+	iobase_1 = pci_read_config(dev, 0x10, 4) & 0xfffffffc;
+	altiobase_1 = pci_read_config(dev, 0x14, 4) & 0xfffffffc;
+	bmaddr_1 = pci_read_config(dev, 0x20, 4) & 0xfffffffc;
 	irq1 = pci_read_config(dev, PCI_INTERRUPT_REG, 4) & 0xff;
     }
 
@@ -274,9 +274,9 @@
 	irq2 = 15;
     }
     else {
-	iobase_2 = pci_read_config(dev, 0x18, 4) & 0xfffc;
-	altiobase_2 = pci_read_config(dev, 0x1c, 4) & 0xfffc;
-	bmaddr_2 = (pci_read_config(dev, 0x20, 4) & 0xfffc) + ATA_BM_OFFSET1;
+	iobase_2 = pci_read_config(dev, 0x18, 4) & 0xfffffffc;
+	altiobase_2 = pci_read_config(dev, 0x1c, 4) & 0xfffffffc;
+	bmaddr_2 = (pci_read_config(dev, 0x20, 4) & 0xfffffffc) + ATA_BM_OFFSET1;
 	irq2 = pci_read_config(dev, PCI_INTERRUPT_REG, 4) & 0xff;
     }
 
@@ -285,7 +285,7 @@
 	/* is busmastering support turned on ? */
 	if ((pci_read_config(dev, PCI_COMMAND_STATUS_REG, 4) & 5) == 5) {
 	    /* is there a valid port range to connect to ? */
-	    if ((bmaddr_1 = pci_read_config(dev, 0x20, 4) & 0xfffc)) {
+	    if ((bmaddr_1 = pci_read_config(dev, 0x20, 4) & 0xfffffffc)) {
 		bmaddr_2 = bmaddr_1 + ATA_BM_OFFSET1;
 		printf("ata-pci%d: Busmastering DMA supported\n", unit);
 	    }


And works pretty well, at that:
              -------Sequential Output-------- ---Sequential Input-- --Random--
              -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
         1024  9235 91.9  9160 12.0  4111  6.6  6617 98.7 14360 14.5 122.2  1.2

So, my question:  Is are you loosing the upper 16 bits for a reason,
or is it valid to look at the upper 16 bits on all platforms?

Thanks,

Drew
------------------------------------------------------------------------------
Andrew Gallatin, Sr Systems Programmer	http://www.cs.duke.edu/~gallatin
Duke University				Email: gallatin@cs.duke.edu
Department of Computer Science		Phone: (919) 660-6590



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