I belive I've made some progress tracking down this problem. The yenta_socket
driver launches the yenta_open_bh thread. Earlier, all CardBus and EXCA
interrupts were masked out. Near line 650, yenta_open_bh tries to allocate an
interrupt line:
if (!(socket->cb_irq) || request_irq(socket->cb_irq, yenta_interrupt,
SA_SHIRQ, socket->dev->name, socket)) {
request_irq, from linux/arch/mips/kernel/irq.c, enters a critical
section around line 873. startup() is invoked on the IRQ descriptor,
and then the critical section is exited with a call to
spin_unlock_irqrestore(&desc->lock,flags);
As soon as this call is made, the kernel calls yenta_interrupt over and over.
Pardon my inexperience, but is this called an 'IRQ storm?'
yenta_interrupt: Entering
yenta_events: Entering
cb_readl: c0113eb0 0000 00000000
cb_writel: c0113eb0 0000 00000000
exca_readb: c0113eb0 0004 00
exca_readb: c0113eb0 0003 00
yenta_events: Exiting (retval is 0)
yenta_interrupt: Exiting
yenta_interrupt: Entering
etc etc
I've verified using our PCI analyzer that no interrupt events are transmitted
by the CardBus bridge, so this seems to be a software problem.
I'm going to continue to hunt this down, on the assumption that the kernel's
interrupt table is getting incorrect / corrupt data. Suggestions are always
appreciated.
May all your CardBuses be happy!
-Jeff
On Mon, Mar 03, 2003 at 06:14:21PM -0800, Jeff Baitis wrote:
> Pete and others:
>
> Thanks! I can access CardBus-enabled cards... but only if I plug the CardBus
> card into a PCI bridge device.
>
> For those who might be interested in hearing, here's my current status:
>
> I tested the PCI->PCI bridge code by copying pb1500/pci_ops.c into
> db1x00/pci_ops.c. It seemed to work. Great!
>
> After noticing that yenta_socket driver still locked up, I plugged a PCI-PCI
> bridge board in between the Au1500 dev board and the CardBus bridge. CardBus
> didn't work quite right, so I checked the PCI configuration registers on all
> devices on my PCI bus.
>
> I noticed the PCI bridge device's SUBORDINATE_BUS value was set to 01, which
> is completely incorrect. It should have been at *least* 11, given that
> the CardBus bridge's SECONDARY_BUS register was set to 10.
>
> So, I used setpci to change the PCI bridge's SUBORDINATE_BUS to 1f. I started
> the CardBus services, and it seems that everything worked with CardBus cards.
> Eject, insert, and status all good -- and I can look at all the PCI
> configuration registers on the CardBus card.
>
> ***
>
> It seems like the issue with plugging in the CardBus bridge directly into
> PCI bus 0 (no PCI-PCI bridge) has to do with 16-bit CardBus support.
> I enabled debugging on yenta_socket, and here's some results. First, I present
> information *without* the PCI bridge, and then *with* PCI bridge.
>
>
> Without PCI bridge:
>
> dmesg gives:
>
> Autoconfig PCI channel 0x8029fc38같
> Scanning bus 00, I/O 0x00000300:0x00100000, Mem 0x40000000:0x44000000
> 00:0c.0 Class 0104: 1103:0007 (rev 01)같같같같같같같같같같같같같같같�
> I/O at 0x00000300 [size=0x8]같
> I/O at 0x00000308 [size=0x4]
> I/O at 0x00000310 [size=0x8]
> I/O at 0x00000318 [size=0x4]
> I/O at 0x00000400 [size=0x100]
> 00:0d.0 Class 0607: 104c:ac56같같같같�
> Mem at 0x40000000 [size=0x1000]
> Mem unavailable -- skipping같같
> I/O at 0x00000500 [size=0x4]
> Mem at 0x40001000 [size=0x1000]
> Mem at 0x40002000 [size=0x1000]
> Mem at 0x40003000 [size=0x1000]
>
> lspci -v gives:
>
> 00:0c.0 RAID bus controller: Triones Technologies, Inc.: Unknown device 0007
> (rev 01)
> Subsystem: Triones Technologies, Inc.: Unknown device 0001
> Flags: bus master, 66Mhz, medium devsel, latency 128, IRQ 1
> I/O ports at 0300 [size=8]
> I/O ports at 0308 [size=4]
> I/O ports at 0310 [size=8]
> I/O ports at 0318 [size=4]
> I/O ports at 0400 [size=256]
> Expansion ROM at <unassigned> [disabled] [size=128K]
> Capabilities: [60] Power Management version 2
>
> 00:0d.0 CardBus bridge: Texas Instruments: Unknown device ac56
> Subsystem: Unknown device 5678:1234
> Flags: bus master, medium devsel, latency 128, IRQ 1
> Memory at 40000000 (32-bit, non-prefetchable) [size=4K]
> Bus: primary=00, secondary=05, subordinate=00, sec-latency=0
> Memory window 0: 40001000-40002000 (prefetchable)
> I/O window 0: 00000000-00000003
> I/O window 1: 00000000-00000003
> 16-bit legacy interface ports at 0001
>
>
> root@10.1.1.154:~# modprobe yenta_socket
>
> Linux Kernel Card Services 3.1.22
> options: [pci] [cardbus]같같같
> config_writel: c0112bd0 0044 00000000
> config_writel: c0112bd0 0010 40000000
> config_writew: c0112bd0 0004 0087같같
> config_writeb: c0112bd0 000c 08같
> config_writeb: c0112bd0 000d a8
> config_writel: c0112bd0 0018 b0000500
> config_readw: c0112bd0 003e 0340같같�
> config_writew: c0112bd0 003e 0580
> exca_writeb: c0112bd0 001e 00같같
> exca_writeb: c0112bd0 0016 00
> cb_writel: c0112bd0 000c 00004000
> cb_writel: c0112bd0 0004 00000000
> config_readl: c0112bd0 001c 40001000
> config_readl: c0112bd0 0020 40002000
> config_readl: c0112bd0 0024 40003000
> config_readl: c0112bd0 0028 00000000
> config_writel: c0112bd0 0024 40400000
> config_writel: c0112bd0 0028 407fffff
> config_readl: c0112bd0 002c 00000000�
> config_readl: c0112bd0 0030 00000000
> config_writel: c0112bd0 002c 00004000
> config_writel: c0112bd0 0030 000040ff
> config_readl: c0112bd0 0034 00000000�
> config_readl: c0112bd0 0038 00000000
> config_writel: c0112bd0 0034 00004400
> config_writel: c0112bd0 0038 000044ff
> cb_readl: c0112bd0 0000 00000006같같�
> cb_writel: c0112bd0 0000 00000006
> exca_readb: c0112bd0 0004 00같같�
> exca_readb: c0112bd0 0003 00
> cb_readl: c0112bd0 0000 00000000
> cb_writel: c0112bd0 0000 00000000
> exca_readb: c0112bd0 0004 00같같�
> exca_readb: c0112bd0 0003 00
> cb_readl: c0112bd0 0000 00000000
> cb_writel: c0112bd0 0000 00000000
> exca_readb: c0112bd0 0004 00같같�
> exca_readb: c0112bd0 0003 00
> cb_readl: c0112bd0 0000 00000000
> cb_writel: c0112bd0 0000 00000000
> exca_readb: c0112bd0 0004 00같같�
> exca_readb: c0112bd0 0003 00
> cb_readl: c0112bd0 0000 00000000
> cb_writel: c0112bd0 0000 00000000
> exca_readb: c0112bd0 0004 00같같�
> exca_readb: c0112bd0 0003 00
> cb_readl: c0112bd0 0000 00000000
> cb_writel: c0112bd0 0000 00000000
> exca_readb: c0112bd0 0004 00같같�
> exca_readb: c0112bd0 0003 00
> ** following portion loops indefinitely **
> cb_readl: c0112bd0 0000 00000000
> cb_writel: c0112bd0 0000 00000000
> exca_readb: c0112bd0 0004 00같같�
> exca_readb: c0112bd0 0003 00
>
> With PCI bridge:
>
> Autoconfig PCI channel 0x8029fc38같
> Scanning bus 00, I/O 0x00000300:0x00100000, Mem 0x40000000:0x44000000
> 00:0c.0 Class 0104: 1103:0007 (rev 01)같같같같같같같같같같같같같같같�
> I/O at 0x00000300 [size=0x8]같
> I/O at 0x00000308 [size=0x4]
> I/O at 0x00000310 [size=0x8]
> I/O at 0x00000318 [size=0x4]
> I/O at 0x00000400 [size=0x100]
> 00:0d.0 Class 0604: 1011:0022 (rev 02)
> Bridge: primary=00, secondary=01
> Scanning sub bus 01, I/O 0x00001000, Mem 0x40000000
> 01:07.0 Class 0607: 104c:ac56같같같같같같같같같같같
> Mem at 0x40000000 [size=0x1000]
> Mem unavailable -- skipping같같
> I/O at 0x00001000 [size=0x4]
> Mem at 0x40001000 [size=0x1000]
> Mem at 0x40002000 [size=0x1000]
> Mem at 0x40003000 [size=0x1000]
> Back to bus 00같같같같같같같같같같같같�
>
> lspci -v gives:
>
> 00:0c.0 RAID bus controller: Triones Technologies, Inc.: Unknown device 0007
> (rev 01)
> Subsystem: Triones Technologies, Inc.: Unknown device 0001
> Flags: bus master, 66Mhz, medium devsel, latency 128, IRQ 1
> I/O ports at 0300 [size=8]
> I/O ports at 0308 [size=4]
> I/O ports at 0310 [size=8]
> I/O ports at 0318 [size=4]
> I/O ports at 0400 [size=256]
> Expansion ROM at <unassigned> [disabled] [size=128K]
> Capabilities: [60] Power Management version 2
>
> 00:0d.0 PCI bridge: Digital Equipment Corporation DECchip 21150 (rev 02)
> (prog-if 00 [Normal decode])
> Flags: bus master, medium devsel, latency 0
> Bus: primary=00, secondary=01, subordinate=1f, sec-latency=0
> I/O behind bridge: 00001000-00001fff
> Memory behind bridge: 40000000-400fffff
> Prefetchable memory behind bridge: 0000000000000000-0000000000000000
>
> 01:07.0 CardBus bridge: Texas Instruments: Unknown device ac56
> Subsystem: Unknown device 5678:1234
> Flags: bus master, medium devsel, latency 128, IRQ 255
> Memory at 40000000 (32-bit, non-prefetchable) [size=4K]
> Bus: primary=00, secondary=10, subordinate=00, sec-latency=0
> Memory window 0: 40001000-40002000 (prefetchable)
> I/O window 0: 00000000-00000003
> I/O window 1: 00000000-00000003
> 16-bit legacy interface ports at 0001
>
> root@10.1.1.154:~# modprobe yenta_socket
>
> Linux Kernel Card Services 3.1.22
> options: [pci] [cardbus]같같같
> config_writel: c0112bd0 0044 00000000
> config_writel: c0112bd0 0010 40000000
> config_writew: c0112bd0 0004 0087같같
> config_writeb: c0112bd0 000c 08같
> config_writeb: c0112bd0 000d a8
> config_writel: c0112bd0 0018 b0001000
> config_readw: c0112bd0 003e 0340같같�
> config_writew: c0112bd0 003e 0580
> exca_writeb: c0112bd0 001e 00같같
> exca_writeb: c0112bd0 0016 00
> cb_writel: c0112bd0 000c 00004000
> cb_writel: c0112bd0 0004 00000000
> config_readl: c0112bd0 001c 40001000
> config_readl: c0112bd0 0020 40002000
> config_readl: c0112bd0 0024 40003000
> config_readl: c0112bd0 0028 00000000
> config_writel: c0112bd0 0024 10000000
> config_writel: c0112bd0 0028 103fffff
> config_readl: c0112bd0 002c 00000000�
> config_readl: c0112bd0 0030 00000000
> config_writel: c0112bd0 002c 00004000
> config_writel: c0112bd0 0030 000040ff
> config_readl: c0112bd0 0034 00000000�
> config_readl: c0112bd0 0038 00000000
> config_writel: c0112bd0 0034 00004400
> config_writel: c0112bd0 0038 000044ff
> config_readw: c0112bd0 003e 05c0같같�
> cb_writel: c0112bd0 0000 ffffffff
> cb_writel: c0112bd0 0004 00000001
> exca_writeb: c0112bd0 0005 00같같
> warning: end_irq 60 did not enable (6)
> warning: end_irq 59 did not enable (6)
> warning: end_irq 58 did not enable (6)
> warning: end_irq 57 did not enable (6)
> warning: end_irq 55 did not enable (6)
> warning: end_irq 52 did not enable (6)
> warning: end_irq 48 did not enable (6)
> warning: end_irq 46 did not enable (6)
> warning: end_irq 45 did not enable (6)
> warning: end_irq 44 did not enable (6)
> warning: end_irq 43 did not enable (6)
> warning: end_irq 42 did not enable (6)
> warning: end_irq 41 did not enable (6)
> warning: end_irq 40 did not enable (6)
> warning: end_irq 39 did not enable (6)
> warning: end_irq 38 did not enable (6)
> warning: end_irq 31 did not enable (6)
> warning: end_irq 27 did not enable (6)
> warning: end_irq 18 did not enable (6)
> warning: end_irq 14 did not enable (6)
> warning: end_irq 5 did not enable (6)�
> warning: end_irq 4 did not enable (6)
> warning: end_irq 2 did not enable (6)
> warning: end_irq 1 did not enable (6)
> warning: end_irq 60 did not enable (16)
> warning: end_irq 59 did not enable (16)
> warning: end_irq 58 did not enable (16)
> warning: end_irq 57 did not enable (16)
> warning: end_irq 55 did not enable (16)
> warning: end_irq 52 did not enable (16)
> warning: end_irq 48 did not enable (16)
> warning: end_irq 46 did not enable (16)
> warning: end_irq 45 did not enable (16)
> warning: end_irq 44 did not enable (16)
> warning: end_irq 43 did not enable (16)
> warning: end_irq 42 did not enable (16)
> warning: end_irq 41 did not enable (16)
> warning: end_irq 40 did not enable (16)
> warning: end_irq 39 did not enable (16)
> warning: end_irq 38 did not enable (16)
> warning: end_irq 27 did not enable (16)
> warning: end_irq 18 did not enable (16)
> warning: end_irq 5 did not enable (16)�
> warning: end_irq 4 did not enable (16)
> warning: end_irq 2 did not enable (16)
> warning: end_irq 1 did not enable (16)
> exca_writeb: c0112bd0 0005 31같같같같�
> cb_writel: c0112bd0 000c 00000001
> cb_writel: c0112bd0 0000 ffffffff
> exca_writeb: c0112bd0 0005 91같같
> cb_writel: c0112bd0 000c 00000001
> cb_writel: c0112bd0 0000 ffffffff
> exca_writeb: c0112bd0 0005 a1같같
> cb_writel: c0112bd0 000c 00000001
> cb_writel: c0112bd0 0000 ffffffff
> exca_writeb: c0112bd0 0005 b1같같
> cb_writel: c0112bd0 000c 00000001
> cb_writel: c0112bd0 0000 ffffffff
> cb_writel: c0112bd0 0004 00000000
> exca_writeb: c0112bd0 0005 00같같
> config_writew: c0112bd0 003e 0540
> Yenta IRQ list 0000, PCI irq0같같
> cb_readl: c0112bd0 0008 30000020
> Socket status: 30000020같같같같�
> config_writel: c0112bd0 0044 00000000
> config_writel: c0112bd0 0010 40000000
> config_writew: c0112bd0 0004 0087같같
> config_writeb: c0112bd0 000c 08같
> config_writeb: c0112bd0 000d a8
> config_writel: c0112bd0 0018 b0001000
> config_readw: c0112bd0 003e 0540같같�
> config_writew: c0112bd0 003e 0580
> exca_writeb: c0112bd0 001e 00같같
> exca_writeb: c0112bd0 0016 00
> cb_writel: c0112bd0 000c 00004000
> cb_readl: c0112bd0 0010 00000400�
> cb_writel: c0112bd0 0010 00000000
> config_readw: c0112bd0 003e 05c0�
> cb_readl: c0112bd0 0008 30000820
> exca_readb: c0112bd0 0003 00같같
> exca_writeb: c0112bd0 0003 00
> config_writew: c0112bd0 003e 0580
> cb_writel: c0112bd0 0000 ffffffff
> cb_writel: c0112bd0 0004 00000006
> exca_readb: c0112bd0 0006 00같같�
> exca_writew: c0112bd0 0008 0000
> exca_writew: c0112bd0 000a 0001
> exca_readb: c0112bd0 0007 00같�
> exca_writeb: c0112bd0 0007 00
> exca_readb: c0112bd0 0006 00�
> exca_writew: c0112bd0 000c 0000
> exca_writew: c0112bd0 000e 0001
> exca_readb: c0112bd0 0007 00같�
> exca_writeb: c0112bd0 0007 00
> exca_readb: c0112bd0 0006 00�
> exca_writeb: c0112bd0 0040 00
> exca_writew: c0112bd0 0010 0000
> exca_writew: c0112bd0 0012 0000
> exca_writew: c0112bd0 0014 0000
> ..... etc etc
>
> Thanks, all, for the information. I hope someone finds this useful!
> I'm gonna get remote kgdb goin' here, so I can hopefully fix the obnoxious
> infinite loop...
>
> -Jeff
>
>
> On Fri, Feb 28, 2003 at 10:15:58PM -0800, Pete Popov wrote:
> > On Fri, 2003-02-28 at 19:48, Jeff Baitis wrote:
> > > Hey Pete and others!
> > >
> > > I'm finally working on CardBus support on the DBAu1500. Just got acquainted
> > > with PCI today. :)
> > >
> > > I decided that the first step is to plug in a PCI->PCI bridge, and try to see
> > > if it would work, which it did not. After winding around inside of the kernel,
> > > I finally arrived in arch/mips/au1000/db1x00/pci_ops.c:
> > >
> > > Inside of config_access(unsigned char access_type, struct pci_dev *dev,
> > > unsigned char where, u32 * data), on line 97, a little surprise:
> > >
> > > if (bus != 0) {
> > > *data = 0xffffffff;
> > > return -1;
> > > }
> > >
> > > At this point, I concluded that I cannot traverse a PCI-PCI or CardBus bridge,
> > > since any devices behind the bridge will require Type 1 Configuration Cycles,
> > > and it seems that only Type 0 is currently supported.
> > >
> > > I assume that I should add code to handle the case where I need to generate
> > > Type 1 Configuration Cycles inside of config_access. Pete, since you authored
> > > this code, I thought I'd quickly run this by you to make sure that I'm on
> > > track.
> > >
> > > Thanks for your suggestions!
> >
> > Take a look at arch/mips/au1000/pb1500/pci_ops.c for type 1 config
> > access. The patch was courtesy of David Gathright and apparently I
> > missed adding it in the db1500. Actually, we need to combine that code
> > because it's the same. Let me get through my eternal struggle of getting
> > the 36 bit patch applied (with Ralf's help I think a modified patch
> > should be ready this weekend) and then I'll worry about clean ups :)
> >
> > Pete
> >
> >
>
> --
> Jeffrey Baitis - Associate Software Engineer
>
> Evolution Robotics, Inc.
> 130 West Union Street
> Pasadena CA 91103
>
> tel: 626.535.2776 | fax: 626.535.2777 | baitisj@evolution.com
>
>
--
Jeffrey Baitis - Associate Software Engineer
Evolution Robotics, Inc.
130 West Union Street
Pasadena CA 91103
tel: 626.535.2776 | fax: 626.535.2777 | baitisj@evolution.com
