linux-kernel - [PATCH 1/1] sh: dreamcast: Fix GAPS PCI bridge addressing

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Message-ID: <20240511191614.68561-2-contact@artur-rojek.eu>
Date: Sat, 11 May 2024 21:16:14 +0200
From: Artur Rojek <contact@...ur-rojek.eu>
To: Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Rich Felker <dalias@...c.org>,
	John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
	Paul Cercueil <paul@...pouillou.net>
Cc: linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Artur Rojek <contact@...ur-rojek.eu>
Subject: [PATCH 1/1] 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: Paul Cercueil <paul@...pouillou.net>
Signed-off-by: Artur Rojek <contact@...ur-rojek.eu>
---
 arch/sh/Kconfig                       | 3 ++-
 arch/sh/boards/mach-dreamcast/setup.c | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 217bdc4d0201..f723e2256c9c 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -126,7 +126,8 @@ 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
diff --git a/arch/sh/boards/mach-dreamcast/setup.c b/arch/sh/boards/mach-dreamcast/setup.c
index 2d966c1c2cc1..daa8455549fa 100644
--- a/arch/sh/boards/mach-dreamcast/setup.c
+++ b/arch/sh/boards/mach-dreamcast/setup.c
@@ -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 = {
-- 
2.45.0