From: Arnd Bergmann <arnd@arndb.de>
To: "Ley Foon Tan" <lftan@altera.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Linux-Arch <linux-arch@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
cltang@codesourcery.com
Subject: Re: [PATCH 07/28] nios2: I/O Mapping
Date: Thu, 24 Apr 2014 09:43:52 +0200 [thread overview]
Message-ID: <23940551.x13XR6zuRa@wuerfel> (raw)
In-Reply-To: <CAFiDJ5_79UoFS0bbgyd6htRELXpsF4bD091Bg1EVsocXt76NEw@mail.gmail.com>
On Thursday 24 April 2014 14:02:47 Ley Foon Tan wrote:
> On Tue, Apr 22, 2014 at 9:59 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> > On Friday 18 April 2014, Ley Foon Tan wrote:
> >
> >> +
> >> +#include <asm/pgtable-bits.h>
> >> +
> >> +#define IO_SPACE_LIMIT 0xffffffff
> >
> > Please use 0xffff here, this should work for almost any PCI bus.
> Ah, CONFIG_PCI is not enable in nios2. So, I think IO_SPACE_LIMIT
> should set to 0.
Yes, possibly with a comment added regarding PCI.
> >> +/*
> >> + * make the short names macros so specific devices
> >> + * can override them as required
> >> + */
> >> +#define inb(addr) readb(addr)
> >> +#define inw(addr) readw(addr)
> >> +#define inl(addr) readl(addr)
> >> +#define outb(x, addr) ((void) writeb(x, addr))
> >> +#define outw(x, addr) ((void) writew(x, addr))
> >> +#define outl(x, addr) ((void) writel(x, addr))
> >
> > This makes no sense: the legacy PC I/O accessors take a completely
> > different argument type: I would recommend to make both inline
> > functions so you can ensure that readl() gets passed an __iomem
> > pointer, while inl() gets an integer number.
> >
> > Please see the asm-generic version for an example. You should also
> > define a non-NULL PCI_IOBASE to which the PCI I/O space gets mapped.
> I think these macros can be removed if PCI is not enabled in Nios2.
We have a bunch of ISA device drivers that use these interfaces but
are not built conditionally through a Kconfig dependency. If you
want 'allyesconfig' to build successfully, you have to provide some
dummy implementation.
> >> +#define ioport_map(port, nr) ioremap(port, nr)
> >> +#define ioport_unmap(port) iounmap(port)
> >
> > Use this one instead:
> >
> > #ifdef CONFIG_PCI
> > static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
> > {
> > return PCI_IOBASE + port;
> > }
> >
> > static inline void __iomem *ioport_unmap(void __iomem *)
> > {
> > }
> > #endif
> These also can be removed.
For this, there is a Kconfig symbol. If you don't provide ioport_map,
you should set CONFIG_NO_IOPORT_MAP. Uwe Kleine-König has recently
started some work in this area. Ideally we would also have a CONFIG_HAS_IOPORT
option that is only set by architectures that actually implement inb/outb.
Getting there still needs work, but any help is appreciated.
Arnd
next prev parent reply other threads:[~2014-04-24 7:44 UTC|newest]
Thread overview: 126+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-18 12:26 [PATCH 00/28] nios2 Linux kernel port Ley Foon Tan
2014-04-18 12:26 ` [PATCH 01/28] nios2: Build infrastructure Ley Foon Tan
2014-04-18 14:35 ` Sam Ravnborg
2014-04-21 3:03 ` Ley Foon Tan
2014-04-18 19:16 ` Paul Bolle
2014-04-21 5:02 ` Ley Foon Tan
2014-04-18 19:41 ` Paul Bolle
2014-04-21 3:26 ` Ley Foon Tan
2014-04-18 12:26 ` [PATCH 02/28] nios2: Assembly macros and definitions Ley Foon Tan
2014-04-18 12:26 ` [PATCH 04/28] nios2: Exception handling Ley Foon Tan
2014-04-22 10:57 ` Ezequiel Garcia
2014-04-22 11:08 ` Ley Foon Tan
2014-04-22 12:33 ` Arnd Bergmann
2014-04-23 2:47 ` Ley Foon Tan
2014-04-23 7:20 ` Geert Uytterhoeven
2014-04-23 12:23 ` Arnd Bergmann
2014-04-24 6:04 ` Ley Foon Tan
2014-04-18 12:26 ` [PATCH 06/28] nios2: Memory management Ley Foon Tan
2014-04-22 14:24 ` Ezequiel Garcia
2014-04-22 15:14 ` Tobias Klauser
2014-04-22 15:35 ` Ezequiel Garcia
2014-04-22 16:01 ` Chung-Lin Tang
2014-04-22 16:27 ` Ezequiel Garcia
2014-04-22 16:36 ` Chung-Lin Tang
2014-04-22 16:24 ` Sam Ravnborg
2014-04-23 2:53 ` LF.Tan
2014-04-23 7:24 ` Geert Uytterhoeven
2014-04-18 12:26 ` [PATCH 08/28] nios2: MMU Fault handling Ley Foon Tan
2014-04-22 14:30 ` Ezequiel Garcia
2014-04-24 6:42 ` Ley Foon Tan
2014-04-24 15:22 ` Ezequiel Garcia
2014-04-24 16:02 ` Ley Foon Tan
2014-04-24 16:18 ` Ezequiel Garcia
2014-04-24 7:18 ` Geert Uytterhoeven
2014-04-18 12:26 ` [PATCH 09/28] nios2: Page table management Ley Foon Tan
2014-04-19 16:05 ` Pavel Machek
2014-04-22 8:09 ` Ley Foon Tan
2014-04-18 12:26 ` [PATCH 10/28] nios2: Process management Ley Foon Tan
2014-04-18 12:26 ` [PATCH 11/28] nios2: Cache handling Ley Foon Tan
2014-04-18 12:26 ` [PATCH 12/28] nios2: TLB handling Ley Foon Tan
2014-04-18 12:26 ` [PATCH 13/28] nios2: Interrupt handling Ley Foon Tan
2014-04-18 12:26 ` [PATCH 15/28] nios2: ELF definitions Ley Foon Tan
2014-04-18 12:26 ` [PATCH 16/28] nios2: System calls handling Ley Foon Tan
2014-04-19 16:09 ` Pavel Machek
2014-04-21 17:32 ` Ley Foon Tan
2014-04-21 17:52 ` Richard Weinberger
2014-04-21 20:48 ` Pavel Machek
2014-04-22 8:24 ` Ley Foon Tan
2014-04-21 20:46 ` Pavel Machek
2014-04-19 20:12 ` Geert Uytterhoeven
2014-04-21 17:23 ` Ley Foon Tan
2014-04-22 12:30 ` Arnd Bergmann
2014-04-24 16:23 ` Ley Foon Tan
2014-04-18 12:27 ` [PATCH 17/28] nios2: Signal handling support Ley Foon Tan
2014-04-19 19:29 ` Richard Weinberger
2014-04-24 10:01 ` Ley Foon Tan
2014-04-24 10:07 ` Richard Weinberger
2014-04-24 10:13 ` Ley Foon Tan
2014-04-24 10:17 ` Richard Weinberger
2014-04-24 10:29 ` Ley Foon Tan
2014-04-24 10:39 ` Richard Weinberger
2014-04-24 10:46 ` Ley Foon Tan
2014-04-24 16:16 ` Richard Weinberger
2014-04-18 12:27 ` [PATCH 18/28] nios2: Library functions Ley Foon Tan
2014-04-18 12:27 ` [PATCH 19/28] nios2: Device tree support Ley Foon Tan
2014-04-22 13:42 ` Arnd Bergmann
2014-04-23 6:52 ` Ley Foon Tan
2014-04-23 7:35 ` Arnd Bergmann
2014-04-23 9:52 ` Ley Foon Tan
2014-04-24 16:05 ` Ezequiel Garcia
2014-04-18 12:27 ` [PATCH 20/28] nios2: Time keeping Ley Foon Tan
2014-04-22 13:44 ` Arnd Bergmann
2014-04-23 3:21 ` Ley Foon Tan
2014-04-18 12:27 ` [PATCH 21/28] nios2: Cpuinfo handling Ley Foon Tan
2014-04-18 12:27 ` [PATCH 22/28] nios2: Miscellaneous header files Ley Foon Tan
2014-04-18 12:27 ` [PATCH 23/28] nios2: Nios2 registers Ley Foon Tan
2014-04-22 12:39 ` Tobias Klauser
2014-04-23 7:10 ` Ley Foon Tan
2014-04-23 8:00 ` Tobias Klauser
2014-04-18 12:27 ` [PATCH 24/28] nios2: Module support Ley Foon Tan
2014-04-18 12:27 ` [PATCH 25/28] nios2: ptrace support Ley Foon Tan
2014-04-25 23:52 ` Pedro Alves
2014-04-28 6:03 ` Ley Foon Tan
2014-04-18 12:27 ` [PATCH 26/28] Add ELF machine define for Nios2 Ley Foon Tan
2014-04-18 12:27 ` [PATCH 27/28] MAINTAINERS: Add nios2 maintainer Ley Foon Tan
2014-04-18 12:27 ` [PATCH 28/28] Documentation: Add documentation for Nios2 architecture Ley Foon Tan
2014-04-22 12:28 ` Tobias Klauser
2014-04-23 7:48 ` Ley Foon Tan
2014-04-18 18:19 ` [PATCH 03/28] nios2: Kernel booting and initialization Ley Foon Tan
2014-04-18 18:19 ` [PATCH 05/28] nios2: Traps exception handling Ley Foon Tan
2014-04-22 14:28 ` Ezequiel Garcia
2014-04-23 10:07 ` Ley Foon Tan
2014-04-18 18:19 ` [PATCH 07/28] nios2: I/O Mapping Ley Foon Tan
2014-04-22 13:59 ` Arnd Bergmann
2014-04-24 6:02 ` Ley Foon Tan
2014-04-24 7:43 ` Arnd Bergmann [this message]
2014-04-24 15:51 ` Ley Foon Tan
2014-05-02 10:37 ` Ley Foon Tan
2014-05-02 12:22 ` Arnd Bergmann
2014-05-05 7:13 ` Ley Foon Tan
2014-04-18 18:19 ` [PATCH 14/28] nios2: DMA mapping API Ley Foon Tan
2014-04-22 13:52 ` Arnd Bergmann
2014-04-25 10:13 ` Ley Foon Tan
2014-04-25 10:33 ` Arnd Bergmann
2014-04-25 10:36 ` Ley Foon Tan
2014-04-18 20:48 ` [PATCH 00/28] nios2 Linux kernel port H. Peter Anvin
2014-04-19 15:30 ` Arnd Bergmann
2014-04-21 5:23 ` Ley Foon Tan
2014-04-21 5:31 ` H. Peter Anvin
2014-04-21 8:14 ` Chung-Lin Tang
2014-04-22 10:37 ` Ley Foon Tan
2014-04-22 10:56 ` Arnd Bergmann
2014-04-22 11:20 ` Ley Foon Tan
2014-04-22 14:48 ` Chung-Lin Tang
2014-04-23 17:59 ` Chung-Lin Tang
2014-04-23 18:15 ` Pinski, Andrew
2014-04-23 19:21 ` H. Peter Anvin
2014-04-24 6:26 ` Chung-Lin Tang
2014-04-24 8:55 ` Chung-Lin Tang
2014-04-24 15:28 ` Catalin Marinas
2014-04-24 18:37 ` Chung-Lin Tang
2014-04-24 18:42 ` Pinski, Andrew
2014-04-25 6:06 ` Chung-Lin Tang
2014-04-25 8:37 ` Pinski, Andrew
2014-04-25 13:19 ` Chung-Lin Tang
2014-04-25 8:49 ` Geert Uytterhoeven
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