Commit d89bf5af authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by Kelsey Skunberg

sh: landisk: Add missing initialization of sh_io_port_base

BugLink: https://bugs.launchpad.net/bugs/1892822

[ Upstream commit 0c64a0dc ]

The Landisk setup code maps the CF IDE area using ioremap_prot(), and
passes the resulting virtual addresses to the pata_platform driver,
disguising them as I/O port addresses.  Hence the pata_platform driver
translates them again using ioport_map().
As CONFIG_GENERIC_IOMAP=n, and CONFIG_HAS_IOPORT_MAP=y, the
SuperH-specific mapping code in arch/sh/kernel/ioport.c translates
I/O port addresses to virtual addresses by adding sh_io_port_base, which
defaults to -1, thus breaking the assumption of an identity mapping.

Fix this by setting sh_io_port_base to zero.

Fixes: 37b7a978 ("sh: machvec IO death.")
Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarRich Felker <dalias@libc.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
Signed-off-by: default avatarKhalid Elmously <khalid.elmously@canonical.com>
Signed-off-by: default avatarIan May <ian.may@canonical.com>
Signed-off-by: default avatarKelsey Skunberg <kelsey.skunberg@canonical.com>
parent 380b78e3
......@@ -85,6 +85,9 @@ device_initcall(landisk_devices_setup);
static void __init landisk_setup(char **cmdline_p)
{
/* I/O port identity mapping */
__set_io_port_base(0);
/* LED ON */
__raw_writeb(__raw_readb(PA_LED) | 0x03, PA_LED);
......
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