From 432a6241bdb70b98ead8f58bbf717d3f7fe699a8 Mon Sep 17 00:00:00 2001 From: Vadzim Dambrouski Date: Mon, 19 Oct 2015 19:40:14 +0300 Subject: arm: add support for semihosting for ARMv7M targets If you enable CONFIG_SEMIHOSTING for STM32F429 target, you will get compile error looking like this: arch/arm/lib/semihosting.c: In function 'smh_read': {standard input}: Assembler messages: {standard input}:34: Error: invalid swi expression {standard input}:34: Error: value of 1193046 too large for field of 2 bytes at 0 scripts/Makefile.build:277: recipe for target 'arch/arm/lib/semihosting.o' failed The source of the problem is "svc #0x123456" instruction. This instruction can not be encoded using Thumb2 instruction set used by ARMv7M CPUs. ARM documentation suggests using "bkpt #0xAB" instruction instead [1]. This patch fixes compile errors and adds support for semihosting for STM32F429 or any other ARMv7M target. This change was sested on STM32F429-DISCOVERY board using OpenOCD and "smhload" u-boot command. [1] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0471c/Bgbjhiea.html Signed-off-by: Vadzim Dambrouski --- arch/arm/lib/semihosting.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/lib/semihosting.c b/arch/arm/lib/semihosting.c index c3e964e..ed5e8e4 100644 --- a/arch/arm/lib/semihosting.c +++ b/arch/arm/lib/semihosting.c @@ -31,6 +31,8 @@ static noinline long smh_trap(unsigned int sysnum, void *addr) register long result asm("r0"); #if defined(CONFIG_ARM64) asm volatile ("hlt #0xf000" : "=r" (result) : "0"(sysnum), "r"(addr)); +#elif defined(CONFIG_CPU_V7M) + asm volatile ("bkpt #0xAB" : "=r" (result) : "0"(sysnum), "r"(addr)); #else /* Note - untested placeholder */ asm volatile ("svc #0x123456" : "=r" (result) : "0"(sysnum), "r"(addr)); -- cgit v1.1 From 7bdf75ca5cf253276e3cfcf5af8da9029e50790f Mon Sep 17 00:00:00 2001 From: Vadzim Dambrouski Date: Mon, 19 Oct 2015 19:40:15 +0300 Subject: arm: fix compile warnings when semihosting is enabled on ARMv7M target. This patch fixes compile warnings like this: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t' In C99 standard you can use %zu modifier to print size_t values. Signed-off-by: Vadzim Dambrouski --- arch/arm/lib/semihosting.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/lib/semihosting.c b/arch/arm/lib/semihosting.c index ed5e8e4..e32ad90 100644 --- a/arch/arm/lib/semihosting.c +++ b/arch/arm/lib/semihosting.c @@ -92,7 +92,7 @@ static long smh_read(long fd, void *memp, size_t len) size_t len; } read; - debug("%s: fd %ld, memp %p, len %lu\n", __func__, fd, memp, len); + debug("%s: fd %ld, memp %p, len %zu\n", __func__, fd, memp, len); read.fd = fd; read.memp = memp; @@ -106,7 +106,7 @@ static long smh_read(long fd, void *memp, size_t len) * hard to maintain partial read loops and such, just fail * with an error message. */ - printf("%s: ERROR ret %ld, fd %ld, len %lu memp %p\n", + printf("%s: ERROR ret %ld, fd %ld, len %zu memp %p\n", __func__, ret, fd, len, memp); return -1; } -- cgit v1.1 From 62e92077a8936e60087d55683538ee386cc673aa Mon Sep 17 00:00:00 2001 From: Albert ARIBAUD Date: Fri, 23 Oct 2015 18:06:40 +0200 Subject: arm: support Thumb-1 with CONFIG_SYS_THUMB_BUILD When building a Thumb-1-only target with CONFIG_SYS_THUMB_BUILD, some files fail to build, most of the time because they include mcr instructions, which only exist for Thumb-2. This patch introduces a Kconfig option CONFIG_THUMB2 and uses it to select between Thumb-2 and ARM mode for the aforementioned files. Signed-off-by: Albert ARIBAUD --- arch/arm/Kconfig | 5 ++ arch/arm/cpu/arm926ejs/Makefile | 11 ++++ arch/arm/cpu/arm926ejs/cache.c | 5 ++ arch/arm/include/asm/cache.h | 4 ++ arch/arm/lib/Makefile | 24 +++++++++ arch/arm/lib/cache.c | 11 ++++ arch/arm/lib/memcpy.S | 4 +- arch/arm/lib/memset.S | 2 +- arch/arm/mach-orion5x/Makefile | 10 ++++ arch/arm/thumb1/include/asm/proc-armv/system.h | 69 ++++++++++++++++++++++++++ 10 files changed, 142 insertions(+), 3 deletions(-) create mode 100644 arch/arm/thumb1/include/asm/proc-armv/system.h (limited to 'arch/arm') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 0d756cb..5ab0254 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -10,6 +10,9 @@ config ARM64 config HAS_VBAR bool +config HAS_THUMB2 + bool + config CPU_ARM720T bool @@ -32,9 +35,11 @@ config CPU_ARM1176 config CPU_V7 bool select HAS_VBAR + select HAS_THUMB2 config CPU_V7M bool + select HAS_THUMB2 config CPU_PXA bool diff --git a/arch/arm/cpu/arm926ejs/Makefile b/arch/arm/cpu/arm926ejs/Makefile index 63fa159..fe78922 100644 --- a/arch/arm/cpu/arm926ejs/Makefile +++ b/arch/arm/cpu/arm926ejs/Makefile @@ -20,3 +20,14 @@ obj-$(CONFIG_MX25) += mx25/ obj-$(CONFIG_MX27) += mx27/ obj-$(if $(filter mxs,$(SOC)),y) += mxs/ obj-$(if $(filter spear,$(SOC)),y) += spear/ + +# some files can only build in ARM or THUMB2, not THUMB1 + +ifdef CONFIG_SYS_THUMB_BUILD +ifndef CONFIG_HAS_THUMB2 + +CFLAGS_cpu.o := -marm +CFLAGS_cache.o := -marm + +endif +endif diff --git a/arch/arm/cpu/arm926ejs/cache.c b/arch/arm/cpu/arm926ejs/cache.c index e5c1a6a..2839c86 100644 --- a/arch/arm/cpu/arm926ejs/cache.c +++ b/arch/arm/cpu/arm926ejs/cache.c @@ -82,4 +82,9 @@ void flush_dcache_all(void) /* * Stub implementations for l2 cache operations */ + __weak void l2_cache_disable(void) {} + +#if defined CONFIG_SYS_THUMB_BUILD +__weak void invalidate_l2_cache(void) {} +#endif diff --git a/arch/arm/include/asm/cache.h b/arch/arm/include/asm/cache.h index a836e9f..1f63127 100644 --- a/arch/arm/include/asm/cache.h +++ b/arch/arm/include/asm/cache.h @@ -16,6 +16,9 @@ /* * Invalidate L2 Cache using co-proc instruction */ +#ifdef CONFIG_SYS_THUMB_BUILD +void invalidate_l2_cache(void); +#else static inline void invalidate_l2_cache(void) { unsigned int val=0; @@ -24,6 +27,7 @@ static inline void invalidate_l2_cache(void) : : "r" (val) : "cc"); isb(); } +#endif void l2_cache_enable(void); void l2_cache_disable(void); diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile index 2bdfaba..f3db7b5 100644 --- a/arch/arm/lib/Makefile +++ b/arch/arm/lib/Makefile @@ -60,3 +60,27 @@ obj-$(CONFIG_DEBUG_LL) += debug.o ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS))) extra-y += eabi_compat.o endif + +# some files can only build in ARM or THUMB2, not THUMB1 + +ifdef CONFIG_SYS_THUMB_BUILD +ifndef CONFIG_HAS_THUMB2 + +# for C files, just apend -marm, which will override previous -mthumb* + +CFLAGS_cache.o := -marm +CFLAGS_cache-cp15.o := -marm + +# For .S, drop -mthumb* and other thumb-related options. +# CFLAGS_REMOVE_* would not have an effet, so AFLAGS_REMOVE_* +# was implemented and is used here. +# Also, define ${target}_NO_THUMB_BUILD for these two targets +# so that the code knows it should not use Thumb. + +AFLAGS_REMOVE_memset.o := -mthumb -mthumb-interwork +AFLAGS_REMOVE_memcpy.o := -mthumb -mthumb-interwork +AFLAGS_memset.o := -DMEMSET_NO_THUMB_BUILD +AFLAGS_memcpy.o := -DMEMCPY_NO_THUMB_BUILD + +endif +endif diff --git a/arch/arm/lib/cache.c b/arch/arm/lib/cache.c index cd13db3..3bd8710 100644 --- a/arch/arm/lib/cache.c +++ b/arch/arm/lib/cache.c @@ -88,3 +88,14 @@ phys_addr_t noncached_alloc(size_t size, size_t align) return next; } #endif /* CONFIG_SYS_NONCACHED_MEMORY */ + +#if defined(CONFIG_SYS_THUMB_BUILD) +void invalidate_l2_cache(void) +{ + unsigned int val = 0; + + asm volatile("mcr p15, 1, %0, c15, c11, 0 @ invl l2 cache" + : : "r" (val) : "cc"); + isb(); +} +#endif diff --git a/arch/arm/lib/memcpy.S b/arch/arm/lib/memcpy.S index eeaf003..7d9fc0f 100644 --- a/arch/arm/lib/memcpy.S +++ b/arch/arm/lib/memcpy.S @@ -13,7 +13,7 @@ #include #include -#ifdef CONFIG_SYS_THUMB_BUILD +#if defined(CONFIG_SYS_THUMB_BUILD) && !defined(MEMCPY_NO_THUMB_BUILD) #define W(instr) instr.w #else #define W(instr) instr @@ -62,7 +62,7 @@ /* Prototype: void *memcpy(void *dest, const void *src, size_t n); */ .syntax unified -#ifdef CONFIG_SYS_THUMB_BUILD +#if defined(CONFIG_SYS_THUMB_BUILD) && !defined(MEMCPY_NO_THUMB_BUILD) .thumb .thumb_func #endif diff --git a/arch/arm/lib/memset.S b/arch/arm/lib/memset.S index 7208f20..df053a3 100644 --- a/arch/arm/lib/memset.S +++ b/arch/arm/lib/memset.S @@ -16,7 +16,7 @@ .align 5 .syntax unified -#ifdef CONFIG_SYS_THUMB_BUILD +#if defined(CONFIG_SYS_THUMB_BUILD) && !defined(MEMSET_NO_THUMB_BUILD) .thumb .thumb_func #endif diff --git a/arch/arm/mach-orion5x/Makefile b/arch/arm/mach-orion5x/Makefile index 546ebcb..33dcad4 100644 --- a/arch/arm/mach-orion5x/Makefile +++ b/arch/arm/mach-orion5x/Makefile @@ -16,3 +16,13 @@ obj-y += timer.o ifndef CONFIG_SKIP_LOWLEVEL_INIT obj-y += lowlevel_init.o endif + +# some files can only build in ARM or THUMB2, not THUMB1 + +ifdef CONFIG_SYS_THUMB_BUILD +ifndef CONFIG_HAS_THUMB2 + +CFLAGS_cpu.o := -marm + +endif +endif diff --git a/arch/arm/thumb1/include/asm/proc-armv/system.h b/arch/arm/thumb1/include/asm/proc-armv/system.h new file mode 100644 index 0000000..7dfbf3d --- /dev/null +++ b/arch/arm/thumb1/include/asm/proc-armv/system.h @@ -0,0 +1,69 @@ +/* + * Thumb-1 drop-in for the linux/include/asm-arm/proc-armv/system.h + * + * (C) Copyright 2015 + * Albert ARIBAUD + * + * The original file does not build in Thumb mode. However, in U-Boot + * we don't use interrupt context, so we can redefine these as empty + * memory barriers, which makes Thumb-1 compiler happy. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +/* + * Use the same macro name as linux/include/asm-arm/proc-armv/system.h + * here, so that if the original ever gets included after us, it won't + * try to re-redefine anything. + */ + +#ifndef __ASM_PROC_SYSTEM_H +#define __ASM_PROC_SYSTEM_H + +/* + * Redefine all original macros with static inline functions containing + * a simple memory barrier, so that they produce the same instruction + * ordering constraints as their original counterparts. + * We use static inline functions rather than macros so that we can tell + * the compiler to not complain about unused arguments. + */ + +static inline void local_irq_save( + unsigned long flags __attribute__((unused))) +{ + __asm__ __volatile__ ("" : : : "memory"); +} + +static inline void local_irq_enable(void) +{ + __asm__ __volatile__ ("" : : : "memory"); +} + +static inline void local_irq_disable(void) +{ + __asm__ __volatile__ ("" : : : "memory"); +} + +static inline void __stf(void) +{ + __asm__ __volatile__ ("" : : : "memory"); +} + +static inline void __clf(void) +{ + __asm__ __volatile__ ("" : : : "memory"); +} + +static inline void local_save_flags( + unsigned long flags __attribute__((unused))) +{ + __asm__ __volatile__ ("" : : : "memory"); +} + +static inline void local_irq_restore( + unsigned long flags __attribute__((unused))) +{ + __asm__ __volatile__ ("" : : : "memory"); +} + +#endif /* __ASM_PROC_SYSTEM_H */ -- cgit v1.1 From e7de61b3e4a7335cd50f52b820d710f8bd50d684 Mon Sep 17 00:00:00 2001 From: Albert ARIBAUD Date: Fri, 23 Oct 2015 18:06:42 +0200 Subject: kirkwood: support CONFIG_SYS_THUMB_BUILD Kirkwood files cpu.c and cache.c cannot build in Thumb state; force them in ARM state even under CONFIG_SYS_THUMB_BUILD. Signed-off-by: Albert ARIBAUD --- arch/arm/mach-kirkwood/Makefile | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/mach-kirkwood/Makefile b/arch/arm/mach-kirkwood/Makefile index df4756e..5abcf70 100644 --- a/arch/arm/mach-kirkwood/Makefile +++ b/arch/arm/mach-kirkwood/Makefile @@ -9,3 +9,9 @@ obj-y = cpu.o obj-y += cache.o obj-y += mpp.o + +# cpu.o and cache.o contain CP15 instructions which cannot be run in +# Thumb state, so build them for ARM state even with CONFIG_SYS_THUMB_BUILD + +CFLAGS_cpu.o := -marm +CFLAGS_cache.o := -marm -- cgit v1.1 From 35629363733a8e68c61f6698eaaeffdf66d3ec65 Mon Sep 17 00:00:00 2001 From: Albert ARIBAUD Date: Fri, 23 Oct 2015 18:06:43 +0200 Subject: Revive OpenRD targets Revert commit 7a2c1b13 which dropped OpenRD boards. Assume maintainership of OpenRD. Remove OpenRD from scrapyard. Switch OpenRD to generic board. Switch to Thumb build. Signed-off-by: Albert ARIBAUD --- arch/arm/mach-kirkwood/Kconfig | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/mach-kirkwood/Kconfig b/arch/arm/mach-kirkwood/Kconfig index aab5d19..f7737bf 100644 --- a/arch/arm/mach-kirkwood/Kconfig +++ b/arch/arm/mach-kirkwood/Kconfig @@ -4,6 +4,9 @@ choice prompt "Marvell Kirkwood board select" optional +config TARGET_OPENRD + bool "Marvell OpenRD Board" + config TARGET_DREAMPLUG bool "DreamPlug Board" @@ -51,6 +54,7 @@ endchoice config SYS_SOC default "kirkwood" +source "board/Marvell/openrd/Kconfig" source "board/Marvell/dreamplug/Kconfig" source "board/Marvell/guruplug/Kconfig" source "board/Marvell/sheevaplug/Kconfig" -- cgit v1.1 From 4cd3246f2a3a3a5032edcaed3cf807dd916f0aea Mon Sep 17 00:00:00 2001 From: Vadzim Dambrouski Date: Fri, 23 Oct 2015 21:14:06 +0300 Subject: arm: stm32f4: fix a bug when only first sector gets erased flash_lock call is inside a for loop, so after the first iteration flash is locked and no more sectors can be erased. Move flash_lock out of the loop. Signed-off-by: Vadzim Dambrouski --- arch/arm/cpu/armv7m/stm32f4/flash.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/arm') diff --git a/arch/arm/cpu/armv7m/stm32f4/flash.c b/arch/arm/cpu/armv7m/stm32f4/flash.c index e5c6111..ae63790 100644 --- a/arch/arm/cpu/armv7m/stm32f4/flash.c +++ b/arch/arm/cpu/armv7m/stm32f4/flash.c @@ -114,9 +114,9 @@ int flash_erase(flash_info_t *info, int first, int last) ; clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SER); - stm32f4_flash_lock(1); } + stm32f4_flash_lock(1); return 0; } -- cgit v1.1 From 43fb0e3926dc52d4618d172a388cb6750311193d Mon Sep 17 00:00:00 2001 From: Vadzim Dambrouski Date: Fri, 23 Oct 2015 21:14:07 +0300 Subject: arm: stm32f4: fix a bug when a random sector gets erased Old sector number is not being cleared from FLASH_CR register. For example when first erased sector was 001 and then you want to erase sector 010, sector 011 gets erased instead. This patch clears old sector number from FLASH_CR register before a new one is written. Signed-off-by: Vadzim Dambrouski --- arch/arm/cpu/armv7m/stm32f4/flash.c | 3 +++ arch/arm/include/asm/arch-stm32f4/stm32.h | 1 + 2 files changed, 4 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/cpu/armv7m/stm32f4/flash.c b/arch/arm/cpu/armv7m/stm32f4/flash.c index ae63790..dd058bd 100644 --- a/arch/arm/cpu/armv7m/stm32f4/flash.c +++ b/arch/arm/cpu/armv7m/stm32f4/flash.c @@ -97,6 +97,9 @@ int flash_erase(flash_info_t *info, int first, int last) while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY) ; + /* clear old sector number before writing a new one */ + clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SNB_MASK); + if (bank == 0) { setbits_le32(&STM32_FLASH->cr, (i << STM32_FLASH_CR_SNB_OFFSET)); diff --git a/arch/arm/include/asm/arch-stm32f4/stm32.h b/arch/arm/include/asm/arch-stm32f4/stm32.h index 3ed3801..7ca6dc3 100644 --- a/arch/arm/include/asm/arch-stm32f4/stm32.h +++ b/arch/arm/include/asm/arch-stm32f4/stm32.h @@ -104,6 +104,7 @@ struct stm32_flash_regs { #define STM32_FLASH_CR_STRT (1 << 16) #define STM32_FLASH_CR_LOCK (1 << 31) #define STM32_FLASH_CR_SNB_OFFSET 3 +#define STM32_FLASH_CR_SNB_MASK (15 << STM32_FLASH_CR_SNB_OFFSET) enum clock { CLOCK_CORE, -- cgit v1.1 From 88f965d720b745431a1fbe9107c561b7f381026c Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Mon, 5 Oct 2015 12:08:59 -0600 Subject: armv8: enable compilation with CONFIG_SYS_NONCACHED_MEMORY The implementation of noncached_init() uses define MMU_SECTION_SIZE. Define this on ARM64. Move the prototype of noncached_{init,alloc}() to a location that doesn't depend on !defined(CONFIG_ARM64). Note that noncached_init() calls mmu_set_region_dcache_behaviour() which relies on something having set up translation tables with 2MB block size. The core ARMv8 MMU setup code does not do this by default, but currently relies on SoC specific MMU setup code. Be aware of this before enabling this feature on your platform! Signed-off-by: Stephen Warren --- arch/arm/include/asm/system.h | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index cfc7834..71b3108 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -17,6 +17,7 @@ #define PGTABLE_SIZE (0x10000) /* 2MB granularity */ #define MMU_SECTION_SHIFT 21 +#define MMU_SECTION_SIZE (1 << MMU_SECTION_SHIFT) #ifndef __ASSEMBLY__ @@ -278,11 +279,6 @@ enum { */ void mmu_page_table_flush(unsigned long start, unsigned long stop); -#ifdef CONFIG_SYS_NONCACHED_MEMORY -void noncached_init(void); -phys_addr_t noncached_alloc(size_t size, size_t align); -#endif /* CONFIG_SYS_NONCACHED_MEMORY */ - #endif /* __ASSEMBLY__ */ #define arch_align_stack(x) (x) @@ -302,6 +298,11 @@ phys_addr_t noncached_alloc(size_t size, size_t align); void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size, enum dcache_option option); +#ifdef CONFIG_SYS_NONCACHED_MEMORY +void noncached_init(void); +phys_addr_t noncached_alloc(size_t size, size_t align); +#endif /* CONFIG_SYS_NONCACHED_MEMORY */ + #endif /* __ASSEMBLY__ */ #endif -- cgit v1.1 From 3c6af3bad4f644e050f67146f4a6e177d5e39e76 Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Mon, 5 Oct 2015 12:09:00 -0600 Subject: armv8: allow custom MMU setup routines on ARMv8 In order for noncached_init() to operate correctly, SoCs must set up a custom page table with fine-grained (2MiB) sections, which can be configured from noncached_init(). This is currently performed by arch/arm/cpu/armv8/{fsl-lsch3,zynqmp}/cpu.c by cut/pasting and re-implementing mmu_setup, enable_caches(), etc. There are some other reasons for the duplication there though, such as enabling icache early, and enabling dcaching earlier with a different configuration. This change makes mmu_setup() a weak implementation, so that the MMU setup code can be replaced without having to duplicate other code that calls it. Signed-off-by: Stephen Warren --- arch/arm/cpu/armv8/cache_v8.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/arm') diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c index b1ea822..1ece6a2 100644 --- a/arch/arm/cpu/armv8/cache_v8.c +++ b/arch/arm/cpu/armv8/cache_v8.c @@ -32,7 +32,7 @@ inline void set_pgtable_table(u64 *page_table, u64 index, u64 *table_addr) } /* to activate the MMU we need to set up virtual memory */ -static void mmu_setup(void) +__weak void mmu_setup(void) { bd_t *bd = gd->bd; u64 *page_table = (u64 *)gd->arch.tlb_addr, i, j; -- cgit v1.1 From 376cb1a4531538a031f3875f0aab21f31f8f8c90 Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Mon, 5 Oct 2015 12:09:01 -0600 Subject: ARM: tegra: add custom MMU setup on ARMv8 This sets up a fine-grained page table, which is a requirement for noncached_init() to operate correctly. MMU setup code currently exists in a number of places: - A version in the core ARMv8 support code that sets up page tables that use very large block sizes that CONFIG_SYS_NONCACHED_MEMORY doesn't support. - Enhanced versions for fsl-lsch3 and zynmq that set up finer grained page tables. Ideally, rather than duplicating the MMU setup code yet again this patch would instead consolidate all the different routines into the core ARMv8 code so that it supported all use-cases. However, this will require significant effort since there appear to be a number of discrepancies[1] between different versions of the code, and between the defines/values by some copies of the MMU setup code use and the architectural MMU documentation. Some reverse engineering will be required to determine the intent of the current code. [1] For example, in the core ARMv8 MMU setup code, three defines named TCR_EL[123]_IPS_BITS exist, but only one of them sets the IPS field and the others set a different field (T1SZ) in the page tables. As far as I can tell so far, there should be no need to set different values per exception level nor to modify the T1SZ field at all, since TTBR1 shouldn't be enabled anyway. Another example is inconsistent values for *_VA_BITS between the current core ARMv8 MMU setup code and the various SoC- specific MMU setup code. Another example is that asm/armv8/mmu.h's value for SECTION_SHIFT doesn't match asm/system.h's MMU_SECTION_SHIFT; research is needed to determine which code relies on which of those values and why, and whether fixing the incorrect value will cause any regression. Signed-off-by: Stephen Warren --- arch/arm/mach-tegra/Makefile | 1 + arch/arm/mach-tegra/arm64-mmu.c | 131 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 132 insertions(+) create mode 100644 arch/arm/mach-tegra/arm64-mmu.c (limited to 'arch/arm') diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile index 75924ad..98431a9 100644 --- a/arch/arm/mach-tegra/Makefile +++ b/arch/arm/mach-tegra/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_CMD_ENTERRCM) += cmd_enterrcm.o obj-$(CONFIG_PWM_TEGRA) += pwm.o endif +obj-$(CONFIG_ARM64) += arm64-mmu.o obj-y += ap.o obj-y += board.o board2.o obj-y += cache.o diff --git a/arch/arm/mach-tegra/arm64-mmu.c b/arch/arm/mach-tegra/arm64-mmu.c new file mode 100644 index 0000000..c227652 --- /dev/null +++ b/arch/arm/mach-tegra/arm64-mmu.c @@ -0,0 +1,131 @@ +/* + * (C) Copyright 2014 - 2015 Xilinx, Inc. + * Michal Simek + * (This file derived from arch/arm/cpu/armv8/zynqmp/cpu.c) + * + * Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include + +DECLARE_GLOBAL_DATA_PTR; + +#define SECTION_SHIFT_L1 30UL +#define SECTION_SHIFT_L2 21UL +#define BLOCK_SIZE_L0 0x8000000000UL +#define BLOCK_SIZE_L1 (1 << SECTION_SHIFT_L1) +#define BLOCK_SIZE_L2 (1 << SECTION_SHIFT_L2) + +#define TCR_TG1_4K (1 << 31) +#define TCR_EPD1_DISABLE (1 << 23) +#define TEGRA_VA_BITS 40 +#define TEGRA_TCR TCR_TG1_4K | \ + TCR_EPD1_DISABLE | \ + TCR_SHARED_OUTER | \ + TCR_SHARED_INNER | \ + TCR_IRGN_WBWA | \ + TCR_ORGN_WBWA | \ + TCR_T0SZ(TEGRA_VA_BITS) + +#define MEMORY_ATTR PMD_SECT_AF | PMD_SECT_INNER_SHARE | \ + PMD_ATTRINDX(MT_NORMAL) | \ + PMD_TYPE_SECT +#define DEVICE_ATTR PMD_SECT_AF | PMD_SECT_PXN | \ + PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_NGNRNE) | \ + PMD_TYPE_SECT + +/* 4K size is required to place 512 entries in each level */ +#define TLB_TABLE_SIZE 0x1000 + +/* + * This mmu table looks as below + * Level 0 table contains two entries to 512GB sizes. One is Level1 Table 0 + * and other Level1 Table1. + * Level1 Table0 contains entries for each 1GB from 0 to 511GB. + * Level1 Table1 contains entries for each 1GB from 512GB to 1TB. + * Level2 Table0, Level2 Table1, Level2 Table2 and Level2 Table3 contains + * entries for each 2MB starting from 0GB, 1GB, 2GB and 3GB respectively. + */ +void mmu_setup(void) +{ + int el; + u64 i, section_l1t0, section_l1t1; + u64 section_l2t0, section_l2t1, section_l2t2, section_l2t3; + u64 *level0_table = (u64 *)gd->arch.tlb_addr; + u64 *level1_table_0 = (u64 *)(gd->arch.tlb_addr + TLB_TABLE_SIZE); + u64 *level1_table_1 = (u64 *)(gd->arch.tlb_addr + (2 * TLB_TABLE_SIZE)); + u64 *level2_table_0 = (u64 *)(gd->arch.tlb_addr + (3 * TLB_TABLE_SIZE)); + u64 *level2_table_1 = (u64 *)(gd->arch.tlb_addr + (4 * TLB_TABLE_SIZE)); + u64 *level2_table_2 = (u64 *)(gd->arch.tlb_addr + (5 * TLB_TABLE_SIZE)); + u64 *level2_table_3 = (u64 *)(gd->arch.tlb_addr + (6 * TLB_TABLE_SIZE)); + + /* Invalidate all table entries */ + memset(level0_table, 0, PGTABLE_SIZE); + + level0_table[0] = + (u64)level1_table_0 | PMD_TYPE_TABLE; + level0_table[1] = + (u64)level1_table_1 | PMD_TYPE_TABLE; + + /* + * set level 1 table 0, covering 0 to 512GB + * set level 1 table 1, covering 512GB to 1TB + */ + section_l1t0 = 0; + section_l1t1 = BLOCK_SIZE_L0; + + for (i = 0; i < 512; i++) { + level1_table_0[i] = section_l1t0; + if (i >= 4) + level1_table_0[i] |= MEMORY_ATTR; + level1_table_1[i] = section_l1t1; + level1_table_1[i] |= MEMORY_ATTR; + section_l1t0 += BLOCK_SIZE_L1; + section_l1t1 += BLOCK_SIZE_L1; + } + + level1_table_0[0] = + (u64)level2_table_0 | PMD_TYPE_TABLE; + level1_table_0[1] = + (u64)level2_table_1 | PMD_TYPE_TABLE; + level1_table_0[2] = + (u64)level2_table_2 | PMD_TYPE_TABLE; + level1_table_0[3] = + (u64)level2_table_3 | PMD_TYPE_TABLE; + + section_l2t0 = 0; + section_l2t1 = section_l2t0 + BLOCK_SIZE_L1; /* 1GB */ + section_l2t2 = section_l2t1 + BLOCK_SIZE_L1; /* 2GB */ + section_l2t3 = section_l2t2 + BLOCK_SIZE_L1; /* 3GB */ + + for (i = 0; i < 512; i++) { + level2_table_0[i] = section_l2t0 | DEVICE_ATTR; + level2_table_1[i] = section_l2t1 | DEVICE_ATTR; + level2_table_2[i] = section_l2t2 | MEMORY_ATTR; + level2_table_3[i] = section_l2t3 | MEMORY_ATTR; + section_l2t0 += BLOCK_SIZE_L2; + section_l2t1 += BLOCK_SIZE_L2; + section_l2t2 += BLOCK_SIZE_L2; + section_l2t3 += BLOCK_SIZE_L2; + } + + /* flush new MMU table */ + flush_dcache_range(gd->arch.tlb_addr, + gd->arch.tlb_addr + gd->arch.tlb_size); + + /* point TTBR to the new table */ + el = current_el(); + set_ttbr_tcr_mair(el, gd->arch.tlb_addr, + TEGRA_TCR, MEMORY_ATTRIBUTES); + + set_sctlr(get_sctlr() | CR_M); +} + +u64 *arch_get_page_table(void) +{ + return (u64 *)(gd->arch.tlb_addr + (3 * TLB_TABLE_SIZE)); +} -- cgit v1.1