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SubjectRe: The ethernet driver doesn't get probed
On Mon, Nov 26, 2012 at 08:47:57AM +0100, Belisko Marek wrote:
> On Mon, Nov 26, 2012 at 7:59 AM, Woody Wu <narkewoody@gmail.com> wrote:
> > Hi, List
> >
> > I enabled an ax88796 Ethernet driver in the kernel configuration menu.
> > Kernel version is 3.4.19. The arch is ARM and the system type is
> > Samsung S3C2410.
> >
> > In my debugging, I found the probe function of the driver did not get
> > invoked.
> Did you define platform data and platform device in board file?
> See: arch/arm/mach-pxa/colibri-pxa300.c (line ~87)


No. After read the colibri-pxa300.c, now I understand I must do it!
Great! Thanks!


But some details in the file I need your help.

In pxa300,

static struct resource colibri_asix_resource[] = {
[0] = {
.start = PXA3xx_CS2_PHYS,
.end = PXA3xx_CS2_PHYS + (0x20 * 2) - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = PXA_GPIO_TO_IRQ(COLIBRI_ETH_IRQ_GPIO),
.end = PXA_GPIO_TO_IRQ(COLIBRI_ETH_IRQ_GPIO),
.flags = IORESOURCE_IRQ | IRQF_TRIGGER_FALLING,
}
};

On my board, I only know the below information about the ax88786
controllers::
eth0: AX88796B found at 0x11000000, using IRQ 52, MAC 00:30:61:00:55:38
eth1: AX88796B found at 0x19000000, using IRQ 53, MAC 00:30:61:00:55:39

Do you think how should I specify resources for it? Especially in the
IRQ part, I don't understand whether I should use the GPIO_TO_IRQ
macros as that in the pxa300.

Also, for the chip selection logic appearing in the pxa300,

static mfp_cfg_t colibri_pxa300_eth_pin_config[] __initdata = {
GPIO1_nCS2, /* AX88796 chip select */
GPIO26_GPIO | MFP_PULL_HIGH /* AX88796 IRQ */
};

I also have no ideal whether I should use it. I don't have schematics
for the board, I only have some kernel logs from an old version of
running linux, for which I don't have source code.

Really hope you can give me some help! Thanks in advance.


> >
> > This driver is declared as platform_driver
> >
> > static struct platform_driver axdrv = {
> > .driver = {
> > .name = "ax88796",
> > .owner = THIS_MODULE,
> > },
> > .probe = ax_probe,
> > .remove = ax_remove,
> > .suspend = ax_suspend,
> > .resume = ax_resume,
> > };
> >
> > module_platform_driver(axdrv);
> >
> > So, its driver init function actually goes through
> > platform_driver_register() and then driver_register(), which eventually
> > call driver_attach() trying to attach the driver to the "platform" bus.
> > But, on the platform bus, there is no any device that can match the
> > ax88796 driver, hence the driver failed in attaching.
> >
> > I discovered the full list of devices found on the platform bus:
> >
> > s3c2410-ohci,
> > s3c2410-lcd,
> > s3c2410-wdt,
> > s3c2410-i2c,
> > s3c24xx-iis,
> > s3c2410-nand,
> > s3c24xx_led,
> > s3c2410-uart,
> >
> > You see, in the list, there is no a device looks like ax88796. All these
> > already existed devices on the platform bus are build-in peripherals on
> > the SoC of s3c2410, they are compiled into the code by enabling some
> > kernel configuration options.
> >
> > My question is, in terms of Linux driver technology, how to enable a
> > non-PCI and not on-chip device driver? I think the ax_probe function
> > must be called somehow, is this thinking right? If yes, I think before
> > the driver get initialized, the corresponding device has to appear on
> > the bus, but now it seems not.
> >
> > Thanks in advance.
> >
> > --
> > woody
> > I can't go back to yesterday - because I was a different person then.
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at http://www.tux.org/lkml/
>
> Cheers,
>
> mbe
>
> --
> as simple and primitive as possible
> -------------------------------------------------
> Marek Belisko - OPEN-NANDRA
> Freelance Developer
>
> Ruska Nova Ves 219 | Presov, 08005 Slovak Republic
> Tel: +421 915 052 184
> skype: marekwhite
> twitter: #opennandra
> web: http://open-nandra.com

--
woody
I can't go back to yesterday - because I was a different person then.


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