From: mindentropy@gmail.com (mind entropy)
To: linux-arm-kernel@lists.infradead.org
Subject: On mini2440 IO mappings.
Date: Wed, 5 Jun 2013 12:52:32 +0530 [thread overview]
Message-ID: <CAM2a4uxAs31ba7q9UaYTKJJLvRGeFw3TmE36vbGZYbC0j1OWEA@mail.gmail.com> (raw)
In-Reply-To: <5390072.c6vttxqWyK@wuerfel>
> I don't think it does. The mappings are
>
> static struct map_desc s3c_iodesc[] __initdata = {
> IODESC_ENT(GPIO),
> IODESC_ENT(IRQ),
> IODESC_ENT(MEMCTRL),
> IODESC_ENT(UART)
> };
>
> using these virtual addresses:
>
> #define S3C_ADDR_BASE 0xF6000000
> #define S3C_ADDR(x) ((void __iomem __force *)S3C_ADDR_BASE + (x))
> #define S3C_VA_IRQ S3C_ADDR(0x00000000) /* irq controller(s) */
> #define S3C_VA_SYS S3C_ADDR(0x00100000) /* system control */
> #define S3C_VA_MEM S3C_ADDR(0x00200000) /* memory control */
> #define S3C_VA_UART S3C_ADDR(0x01000000) /* UART */
> #define S3C24XX_VA_GPIO ((S3C24XX_PA_GPIO - S3C24XX_PA_UART) + S3C24XX_VA_UART)
>
> and these physical addresses
>
> #define S3C2410_PA_UART (0x50000000)
> #define S3C2410_PA_GPIO (0x56000000)
> #define S3C2410_PA_IRQ (0x4A000000)
> #define S3C2410_PA_MEMCTRL (0x48000000)
>
> Everything is aligned to full megabytes.
You are right. Sorry I misread the virtual addresses. Now in this
scheme would there be unused holes in the virtual address space (For
eg. IRQ address space is not 1 MB big)?
-Gautam
prev parent reply other threads:[~2013-06-05 7:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-04 7:41 On mini2440 IO mappings mind entropy
2013-06-04 8:52 ` Arnd Bergmann
2013-06-04 9:29 ` mind entropy
2013-06-04 9:47 ` Arnd Bergmann
2013-06-05 7:22 ` mind entropy [this message]
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