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Date: Fri, 22 Apr 2011 10:12:29 +0900
From: "Tomoya MORINAGA" <tomoya-linux@....okisemi.com>
To: "'Grant Likely'" <grant.likely@...retlab.ca>,
"'Lars-Peter Clausen'" <lars@...afoo.de>
Cc: <linux-kernel@...r.kernel.org>, <toshiharu-linux@....okisemi.com>
Subject: RE: Question: GPIO driver how to get irq_base
Hi Grant, Lars-Peter Clausen,
- Executing the following command,
cd /sys/class/gpio/gpio244
echo "falling" > edge
- I can see the following error message.
IRQ handler type mismatch for IRQ 18
current handler: spi_topcliff_pch
Pid: 3269, comm: bash Not tainted 2.6.38.3.upstream_check+ #23
Call Trace:
[<c0470682>] ? __setup_irq+0x257/0x2a9
[<c054a45f>] ? gpio_sysfs_irq+0x0/0x11
[<c047077c>] ? request_threaded_irq+0xa8/0xce
[<c04707fb>] ? request_any_context_irq+0x59/0x64
[<c054a45f>] ? gpio_sysfs_irq+0x0/0x11
[<c054a8f5>] ? gpio_setup_irq.clone.4+0x1fa/0x292
[<c054ae2c>] ? gpio_edge_store+0xa3/0xd2
[<c054ad89>] ? gpio_edge_store+0x0/0xd2
[<c05bf270>] ? dev_attr_store+0x1b/0x23
[<c04e90a5>] ? sysfs_write_file+0xae/0xe7
[<c04e8ff7>] ? sysfs_write_file+0x0/0xe7
[<c04a71a1>] ? vfs_write+0x82/0xd9
[<c04a7366>] ? sys_write+0x3b/0x5d
[<c0403018>] ? sysenter_do_call+0x12/0x28
> Using the above, I can see "irq_base = 18d".
- According to the following "/proc/interrupts" information,
I suspect pch_gpio can't use IRQ18.
[morinaga@...alhost ~]$ cat /proc/interrupts
CPU0 CPU1
0: 30881 0 IO-APIC-edge timer
1: 2 0 IO-APIC-edge i8042
4: 2 0 IO-APIC-edge
8: 128 0 IO-APIC-edge rtc0
9: 0 0 IO-APIC-fasteoi acpi
12: 4 0 IO-APIC-edge i8042
16: 385 0 IO-APIC-fasteoi intel-eg20t-pch, ehci_hcd:usb2, ohci_hcd:usb6, ohci_hcd:usb7, ohci_hcd:usb8,
hda_intel
17: 0 0 IO-APIC-fasteoi eth1
18: 0 0 IO-APIC-fasteoi spi_topcliff_pch, i2c_eg20t, pch-dma, mmc0, mmc1
19: 3599 0 IO-APIC-fasteoi ehci_hcd:usb1, ohci_hcd:usb3, ohci_hcd:usb4, ohci_hcd:usb5, pch-dma,
mga@pci:0000:07:00.0
40: 10298 0 PCI-MSI-edge ahci
42: 98 0 PCI-MSI-edge eth0
NMI: 0 0 Non-maskable interrupts
LOC: 76268 72502 Local timer interrupts
SPU: 0 0 Spurious interrupts
PMI: 0 0 Performance monitoring interrupts
IWI: 0 0 IRQ work interrupts
RES: 1383 1842 Rescheduling interrupts
CAL: 67 108 Function call interrupts
TLB: 224 292 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 1 1 Machine check polls
ERR: 0
MIS: 0
Let me know your opinion.
Thanks,
-----------------------------------------
Tomoya MORINAGA
OKI SEMICONDUCTOR CO., LTD.
> -----Original Message-----
> From: Tomoya MORINAGA [mailto:tomoya-linux@....okisemi.com]
> Sent: Friday, April 22, 2011 9:33 AM
> To: 'Grant Likely'; 'Lars-Peter Clausen'
> Cc: 'linux-kernel@...r.kernel.org'; 'toshiharu-linux@....okisemi.com'
> Subject: RE: Question: GPIO driver how to get irq_base
>
> Hi Grant, Lars-Peter Clausen
>
> Thank you for your information.
>
> It seems nothing driver uses irq_alloc_descs.
> Thus, let me clarify my using.
>
> int irq_base = irq_alloc_descs(-1, 0, 12, GFP_KERNEL)
> (Intel-ET20T-PCH has GPIO~GPIO11)
>
> Using the above, I can see "irq_base = 18d".
> Is the above TRUE ?
>
> Thanks,
> -----------------------------------------
> Tomoya MORINAGA
> OKI SEMICONDUCTOR CO., LTD.
>
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