From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 56339C433F5 for ; Wed, 9 Mar 2022 14:42:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233626AbiCIOno (ORCPT ); Wed, 9 Mar 2022 09:43:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33200 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233617AbiCIOne (ORCPT ); Wed, 9 Mar 2022 09:43:34 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EFD03BC7 for ; Wed, 9 Mar 2022 06:42:29 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 5DA8960EA5 for ; Wed, 9 Mar 2022 14:42:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C4170C340F6; Wed, 9 Mar 2022 14:42:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1646836948; bh=/IOE9q8yo2NZlvwDe/DVbTQPPU3AcAWQOmaN09MF3ds=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JAYul9PoPEfDWMBeCdNiNUwJTibarEbYXVrQU9Qb2clrADYsp4BMJfuZtdDtnfI5y M0M9CgT3+IbHvKCpqrXsb80DY9AbY2h5r2w+ZPszArbcyoSwMetTgzigfNsDOeFB49 eHruOFUCPnOVRGPzMy7ELfJ89Hk2at0zrmGvkG2K9JHHnqxveT58ooxLO/WDMehuTb EhlRWpzNAOWO9AHpmygrRqrXdWppRR8ATvAt/ZWNifbP53Sqbh0BdoqUjKHc0l8tIP HMwY2MQNapTLtQ70ITgnlLUACUZjmfiUZ+28lGaAyu6e/EM5xThDIIh+/25Y0wOLum BPb5u4KzVt3eA== From: Arnd Bergmann To: Russell King , Linus Walleij Cc: Arnd Bergmann , kernel test robot , Thomas Gleixner , Marc Zyngier , Ard Biesheuvel , Andrew Morton , Mark Rutland , Vladimir Murzin , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, "Russell King (Oracle)" , Anshuman Khandual Subject: [PATCH 2/2] ARM: remove support for NOMMU ARMv4/v5 Date: Wed, 9 Mar 2022 15:40:48 +0100 Message-Id: <20220309144138.360482-2-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20220309144138.360482-1-arnd@kernel.org> References: <20220309144138.360482-1-arnd@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnd Bergmann 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. This addresses several build failures in randconfig builds that have accumulated over the years. Cc: Vladimir Murzin Cc: Russell King Signed-off-by: Arnd Bergmann --- If there are no objections, I'd apply this patch to the soc tree for 5.18 as a cleanup. --- arch/arm/Kconfig | 34 +++++++------------ .../mach-footbridge/include/mach/hardware.h | 20 ++++------- arch/arm/mach-footbridge/include/mach/io.h | 20 ----------- arch/arm/mach-integrator/hardware.h | 5 --- 4 files changed, 20 insertions(+), 59 deletions(-) delete mode 100644 arch/arm/mach-footbridge/include/mach/io.h diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 5f0b40bab4fb..d184377ce2ae 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -304,6 +304,17 @@ config MMU Select if you want MMU-based virtualised addressing space support by paged memory management. If unsure, say 'Y'. +config ARM_SINGLE_ARMV7M + def_bool !MMU + select ARM_NVIC + select AUTO_ZRELADDR + select TIMER_OF + select COMMON_CLK + select CPU_V7M + select NO_IOPORT_MAP + select SPARSE_IRQ + select USE_OF + config ARCH_MMAP_RND_BITS_MIN default 8 @@ -318,12 +329,11 @@ config ARCH_MMAP_RND_BITS_MAX # choice prompt "ARM system type" - default ARM_SINGLE_ARMV7M if !MMU - default ARCH_MULTIPLATFORM if MMU + depends on MMU + default ARCH_MULTIPLATFORM config ARCH_MULTIPLATFORM bool "Allow multiple platforms to be selected" - depends on MMU select ARCH_FLATMEM_ENABLE select ARCH_SPARSEMEM_ENABLE select ARCH_SELECT_MEMORY_MODEL @@ -337,18 +347,6 @@ config ARCH_MULTIPLATFORM select SPARSE_IRQ select USE_OF -config ARM_SINGLE_ARMV7M - bool "ARMv7-M based platforms (Cortex-M0/M3/M4)" - depends on !MMU - select ARM_NVIC - select AUTO_ZRELADDR - select TIMER_OF - select COMMON_CLK - select CPU_V7M - select NO_IOPORT_MAP - select SPARSE_IRQ - select USE_OF - config ARCH_EP93XX bool "EP93xx-based" select ARCH_SPARSEMEM_ENABLE @@ -367,7 +365,6 @@ config ARCH_FOOTBRIDGE bool "FootBridge" select CPU_SA110 select FOOTBRIDGE - select NEED_MACH_IO_H if !MMU select NEED_MACH_MEMORY_H help Support for systems based on the DC21285 companion chip @@ -375,7 +372,6 @@ config ARCH_FOOTBRIDGE config ARCH_IOP32X bool "IOP32x-based" - depends on MMU select CPU_XSCALE select GPIO_IOP select GPIOLIB @@ -387,7 +383,6 @@ config ARCH_IOP32X config ARCH_IXP4XX bool "IXP4xx-based" - depends on MMU select ARCH_SUPPORTS_BIG_ENDIAN select ARM_PATCH_PHYS_VIRT select CPU_XSCALE @@ -418,7 +413,6 @@ config ARCH_DOVE config ARCH_PXA bool "PXA2xx/PXA3xx-based" - depends on MMU select ARCH_MTD_XIP select ARM_CPU_SUSPEND if PM select AUTO_ZRELADDR @@ -437,7 +431,6 @@ config ARCH_PXA config ARCH_RPC bool "RiscPC" - depends on MMU depends on !CC_IS_CLANG && GCC_VERSION < 90100 && GCC_VERSION >= 60000 select ARCH_ACORN select ARCH_MAY_HAVE_PC_FDC @@ -493,7 +486,6 @@ config ARCH_S3C24XX config ARCH_OMAP1 bool "TI OMAP1" - depends on MMU select ARCH_OMAP select CLKSRC_MMIO select GENERIC_IRQ_CHIP 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 diff --git a/arch/arm/mach-integrator/hardware.h b/arch/arm/mach-integrator/hardware.h index 4d6ade3dd4ee..81ce09e3ad45 100644 --- a/arch/arm/mach-integrator/hardware.h +++ b/arch/arm/mach-integrator/hardware.h @@ -16,12 +16,7 @@ #define IO_START INTEGRATOR_HDR_BASE // PA of IO /* macro to get at IO space when running virtually */ -#ifdef CONFIG_MMU #define IO_ADDRESS(x) (((x) & 0x000fffff) | (((x) >> 4) & 0x0ff00000) | IO_BASE) -#else -#define IO_ADDRESS(x) (x) -#endif - #define __io_address(n) ((void __iomem *)IO_ADDRESS(n)) /* -- 2.29.2