linux-kernel - Re: [PATCH] sh: Avoid using IRQ0 on SH3 and SH4

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Date:   Sat, 8 Jul 2023 15:06:13 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Sergey Shtylyov <s.shtylyov@....ru>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sh: Avoid using IRQ0 on SH3 and SH4

On 7/8/23 13:52, Sergey Shtylyov wrote:
> On 7/6/23 7:38 PM, John Paul Adrian Glaubitz wrote:
> [...]
> 
>>> Which sh4 platforms in particular?
>>>
>>> I booted a kernel with this patch on rts7751r2d (QEMU) and landisk
>>> (physical) two days ago.
>>
>> I gave it a try with the command line Guenter suggested and indeed the kernel locks
>> up right here with the patch applied and boots fine without it:
>>
>> Creating 4 MTD partitions on "physmap-flash":
>> 0x000000000000-0x000000040000 : "U-Boot"
>> 0x000000040000-0x000000080000 : "Environment"
>> 0x000000080000-0x000000240000 : "Kernel"
>> 0x000000240000-0x000001000000 : "Flash_FS"
>> 8139too: 8139too Fast Ethernet driver 0.9.28
>> 8139too 0000:00:01.0: This (id 10ec:8139 rev 20) is an enhanced 8139C+ chip, use 8139cp
>> sm501-usb sm501-usb: SM501 OHCI
>> sm501-usb sm501-usb: new USB bus registered, assigned bus number 1
>> sm501-usb sm501-usb: irq 116, io mem 0x13e40000
> 
>     I guess it was irq 100 before my patch. What if you undo the following
> part of my patch?
> 

No, that doesn't help.

Guenter

> Index: linux/arch/sh/include/mach-common/mach/r2d.h
> ===================================================================
> --- linux.orig/arch/sh/include/mach-common/mach/r2d.h
> +++ linux/arch/sh/include/mach-common/mach/r2d.h
> @@ -47,7 +47,7 @@
>   
>   #define IRLCNTR1	(PA_BCR + 0)	/* Interrupt Control Register1 */
>   
> -#define R2D_FPGA_IRQ_BASE	100
> +#define R2D_FPGA_IRQ_BASE	(100 + 16)
>   
>   #define IRQ_VOYAGER		(R2D_FPGA_IRQ_BASE + 0)
>   #define IRQ_EXT			(R2D_FPGA_IRQ_BASE + 1)
> 
>> usb usb1: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 6.04
>> usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
>> usb usb1: Product: SM501 OHCI
>> usb usb1: Manufacturer: Linux 6.4.0-12069-gc17414a273b8 ohci_hcd
>> usb usb1: SerialNumber: sm501-usb
>> hub 1-0:1.0: USB hub found
>> hub 1-0:1.0: 2 ports detected
>> usbcore: registered new interface driver usb-storage
>> rtc-r9701 spi0.0: cannot read RTC register
>> usbcore: registered new interface driver usbhid
>> usbhid: USB HID core driver
>> NET: Registered PF_PACKET protocol family
>> heartbeat: version 0.1.2 loaded
>> ata1: found unknown device (class 0)
> [...]
> 
>> Adrian
> 
> MBR, Sergey