Commit 10c88ca5 authored by Artur Rojek's avatar Artur Rojek Committed by John Paul Adrian Glaubitz
Browse files

sh: dreamcast: Fix GAPS PCI bridge addressing 



The G2-to-PCI bridge chip found in SEGA Dreamcast assumes P2 area
relative addresses.

Set the appropriate IOPORT base offset.

Tested-by: default avatarPaul Cercueil <paul@crapouillou.net>
Signed-off-by: default avatarArtur Rojek <contact@artur-rojek.eu>
Reviewed-by: default avatarJohn Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: https://lore.kernel.org/r/20240511191614.68561-2-contact@artur-rojek.eu


Signed-off-by: default avatarJohn Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
parent 21b86515

arch/sh/Kconfig

+2 −1
Original line number Diff line number Diff line
@@ -125,7 +125,8 @@ config ARCH_HAS_ILOG2_U64 


config NO_IOPORT_MAP

	def_bool !PCI

	depends on !SH_SHMIN && !SH_HP6XX && !SH_SOLUTION_ENGINE

	depends on !SH_SHMIN && !SH_HP6XX && !SH_SOLUTION_ENGINE && \

		   !SH_DREAMCAST



config IO_TRAPPED

	bool

arch/sh/boards/mach-dreamcast/setup.c

+3 −0
Original line number Diff line number Diff line
@@ -25,10 +25,13 @@ 
#include <asm/irq.h>

#include <asm/rtc.h>

#include <asm/machvec.h>

#include <cpu/addrspace.h>

#include <mach/sysasic.h>



static void __init dreamcast_setup(char **cmdline_p)

{

	/* GAPS PCI bridge assumes P2 area relative addresses. */

	__set_io_port_base(P2SEG);

}



static struct sh_machine_vector mv_dreamcast __initmv = {