linux-kernel - Re: [PATCH 14/22] ARM: omap1: use pci_ioremap_io() for omap

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Date:   Tue, 13 Aug 2019 21:33:49 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Aaro Koskinen <aaro.koskinen@....fi>
Cc:     Tony Lindgren <tony@...mide.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        linux-omap <linux-omap@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 14/22] ARM: omap1: use pci_ioremap_io() for omap_cf

On Tue, Aug 13, 2019 at 8:12 PM Aaro Koskinen <aaro.koskinen@....fi> wrote:
> On Tue, Aug 13, 2019 at 01:02:16PM +0200, Arnd Bergmann wrote:
> > On Tue, Aug 13, 2019 at 12:36 PM Tony Lindgren <tony@...mide.com> wrote:
>
> > - I force CONFIG_PCI to be enabled here in order to keep the
> >   asm/io.h logic unchanged. If PCI support in itself is an issue,
> >   then turning on CONFIG_PCI without the rest of this patch
> >   should also break.
>
> The board dies early, probably in pci_reserve_io():
>
> Starting kernel ...
>
> [    0.000000] Booting Linux on physical CPU 0x0
> [    0.000000] Linux version 5.3.0-rc4-osk-los_80efa+-00028-g09f6f22a63e9 (aaro@...-fx-6350) (gcc version 8.3.0 (GCC)) #1 Tue Aug 13 20:50:11 EEST 2019
> [    0.000000] CPU: ARM926EJ-S [41069263] revision 3 (ARMv5TEJ), cr=0005317f
> [    0.000000] CPU: VIVT data cache, VIVT instruction cache
> [    0.000000] Machine: TI-OSK
> [    0.000000] Ignoring tag cmdline (using the default kernel command line)
> [    0.000000] printk: bootconsole [earlycon0] enabled
> [    0.000000] Memory policy: Data cache writeback
> [    0.000000] Internal error: Oops - undefined instruction: 0 [#1] ARM
> [    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 5.3.0-rc4-osk-los_80efa+-00028-g09f6f22a63e9 #1
> [    0.000000] Hardware name: TI-OSK
> [    0.000000] PC is at vm_area_add_early+0x1c/0x74

That sounds like an address conflict in the virtual addres space.

In multiplatform kernels, PCI I/O space is hardwired to addresses
0xfee00000-0xfeffffff,
which happened to be available on all the other machines that needed it so far.

OMAP1_IO_VIRT is 0xfefb0000-0xfefeffff, which clearly overlaps with the end of
the PCI I/O area.

We only really need 4KB of I/O space rather than the full 2MB, but it
would also be
good not to make this too machine specific.

Could we change OMAP1_IO_OFFSET to stay out of that area? Something like

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 97c114c1ef80..3b66d203dc98 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -1794,9 +1794,9 @@ config DEBUG_UART_VIRT
        default 0xfef00000 if ARCH_IXP4XX && !CPU_BIG_ENDIAN
        default 0xfef00003 if ARCH_IXP4XX && CPU_BIG_ENDIAN
        default 0xfef36000 if DEBUG_HIGHBANK_UART
-       default 0xfefb0000 if DEBUG_OMAP1UART1 || DEBUG_OMAP7XXUART1
-       default 0xfefb0800 if DEBUG_OMAP1UART2 || DEBUG_OMAP7XXUART2
-       default 0xfefb9800 if DEBUG_OMAP1UART3 || DEBUG_OMAP7XXUART3
+       default 0xff000000 if DEBUG_OMAP1UART1 || DEBUG_OMAP7XXUART1
+       default 0xff000800 if DEBUG_OMAP1UART2 || DEBUG_OMAP7XXUART2
+       default 0xff009800 if DEBUG_OMAP1UART3 || DEBUG_OMAP7XXUART3
        default 0xff003000 if DEBUG_U300_UART
        default 0xffd01000 if DEBUG_HIP01_UART
        default DEBUG_UART_PHYS if !MMU
diff --git a/arch/arm/mach-omap1/hardware.h b/arch/arm/mach-omap1/hardware.h
index 232b8deef907..9fc76a3c9e57 100644
--- a/arch/arm/mach-omap1/hardware.h
+++ b/arch/arm/mach-omap1/hardware.h
@@ -61,7 +61,7 @@ static inline u32 omap_cs3_phys(void)

 #endif /* ifndef __ASSEMBLER__ */

-#define OMAP1_IO_OFFSET                0x01000000      /* Virtual IO
= 0xfefb0000 */
+#define OMAP1_IO_OFFSET                0x00fb0000      /* Virtual IO
= 0xff000000 */
 #define OMAP1_IO_ADDRESS(pa)   IOMEM((pa) - OMAP1_IO_OFFSET)

 #include "serial.h"

There may be additional locations that hardcode the virtual address.

       Arnd