Date: Thu, 13 Jan 2000 17:57:25 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: dfr@nlsystems.com Cc: freebsd-alpha@freebsd.org Subject: Cypress USB oddity Message-ID: <14462.21106.354099.290960@grasshopper.cs.duke.edu>
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The Cypress USB controller (function 3 of the 82C693) used on later Digital Personal Workstations and all XP1000s & DS20s is somewhat odd. It is a PCI device, but it apparently wants to use an ISA interrupt (10) and has a truely bizzare irq in its pci config space (234). This results in the usb driver failing to aquire an irq: ohci0: <OHCI (generic) USB controller> mem 0x1094000-0x1094fff irq 234 at device 7.3 on pci0 ohci0: could not allocate irq The 82C693 has 2 IDE controllers on it as well: ata-pci0: <Cypress 82C693 ATA controller (generic mode)> port 0x10000-0x1000f,0x 3f4-0x3f7,0x1f0-0x1f7 irq 238 at device 7.1 on pci0 <...> ata-pci1: <Cypress 82C693 ATA controller (generic mode)> port 0x374-0x377,0x170- 0x177 irq 239 at device 7.2 on pci0 They would have the same problem except for the fact that their I/O base addrs match the primary & secondary I/O port addresses for IO_WD1 & IO_WD2. Because of this, they end up using the alpha_platform_setup_ide_intr() code which does the right thing and allocates them ISA irqs. What is the right way to handle the USB function? Do we need a similar hack? I have noticed that if you mask those irq's with 0xf, you get the isa irq that it wants. So I was thinking that we could catch this in the pci chipset code by looking for a bizzare irq, then setup the appropriate isa irq. This sounds pretty disgusting -- is there a better way? 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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