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authorArnd Bergmann <arnd@arndb.de>2022-03-09 16:20:20 +0300
committerArnd Bergmann <arnd@arndb.de>2022-03-17 11:13:13 +0300
commit2f618d5ef5dd05e2380ee627814de90d5a33c3f2 (patch)
tree5e2b444654accf60d2a4d7e3dc1620931f2a69f4 /arch/arm/mach-footbridge
parenta483b1b232e616d0095a59b987ffc739bc1b56bc (diff)
downloadlinux-2f618d5ef5dd05e2380ee627814de90d5a33c3f2.tar.xz
ARM: remove support for NOMMU ARMv4/v5
It is possible to build MMU-less kernels for Cortex-M base microcrontrollers as well as a couple of older platforms that have not been converted to CONFIG_ARCH_MULTIPLATFORM, specifically ep93xx, footbridge, dove, sa1100 and s3c24xx. It seems unlikely that anybody has tested those configurations in recent years, as even building them is frequently broken. A patch I submitted caused another build time regression in this configuration. I sent a patch for that, but it seems better to also remove the option entirely, leaving ARMv7-M as the only supported Arm NOMMU target for simplicity. A couple of platforms have dependencies on CONFIG_MMU, those can all be removed now. Notably, mach-integrator tries to support MMU-less CPU cores, but those have not actually been selectable for a long time. This addresses several build failures in randconfig builds that have accumulated over the years. Cc: Vladimir Murzin <vladimir.murzin@arm.com> Cc: Russell King <linux@armlinux.org.uk> Acked-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm/mach-footbridge')
-rw-r--r--arch/arm/mach-footbridge/include/mach/hardware.h20
-rw-r--r--arch/arm/mach-footbridge/include/mach/io.h20
2 files changed, 7 insertions, 33 deletions
diff --git a/arch/arm/mach-footbridge/include/mach/hardware.h b/arch/arm/mach-footbridge/include/mach/hardware.h
index ecaf6e7388d9..985ad3a95671 100644
--- a/arch/arm/mach-footbridge/include/mach/hardware.h
+++ b/arch/arm/mach-footbridge/include/mach/hardware.h
@@ -21,32 +21,26 @@
* 0xf0000000 0x80000000 16MB ISA memory
*/
-#ifdef CONFIG_MMU
-#define MMU_IO(a, b) (a)
-#else
-#define MMU_IO(a, b) (b)
-#endif
-
#define XBUS_SIZE 0x00100000
-#define XBUS_BASE MMU_IO(0xff800000, 0x40000000)
+#define XBUS_BASE 0xff800000
#define ARMCSR_SIZE 0x00100000
-#define ARMCSR_BASE MMU_IO(0xfe000000, 0x42000000)
+#define ARMCSR_BASE 0xfe000000
#define WFLUSH_SIZE 0x00100000
-#define WFLUSH_BASE MMU_IO(0xfd000000, 0x78000000)
+#define WFLUSH_BASE 0xfd000000
#define PCIIACK_SIZE 0x00100000
-#define PCIIACK_BASE MMU_IO(0xfc000000, 0x79000000)
+#define PCIIACK_BASE 0xfc000000
#define PCICFG1_SIZE 0x01000000
-#define PCICFG1_BASE MMU_IO(0xfb000000, 0x7a000000)
+#define PCICFG1_BASE 0xfb000000
#define PCICFG0_SIZE 0x01000000
-#define PCICFG0_BASE MMU_IO(0xfa000000, 0x7b000000)
+#define PCICFG0_BASE 0xfa000000
#define PCIMEM_SIZE 0x01000000
-#define PCIMEM_BASE MMU_IO(0xf0000000, 0x80000000)
+#define PCIMEM_BASE 0xf0000000
#define XBUS_CS2 0x40012000
diff --git a/arch/arm/mach-footbridge/include/mach/io.h b/arch/arm/mach-footbridge/include/mach/io.h
deleted file mode 100644
index 4e18b921373f..000000000000
--- a/arch/arm/mach-footbridge/include/mach/io.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * arch/arm/mach-footbridge/include/mach/io.h
- *
- * Copyright (C) 1997-1999 Russell King
- *
- * Modifications:
- * 06-12-1997 RMK Created.
- * 07-04-1999 RMK Major cleanup
- */
-#ifndef __ASM_ARM_ARCH_IO_H
-#define __ASM_ARM_ARCH_IO_H
-
-/*
- * Translation of various i/o addresses to host addresses for !CONFIG_MMU
- */
-#define PCIO_BASE 0x7c000000
-#define __io(a) ((void __iomem *)(PCIO_BASE + (a)))
-
-#endif