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a2faac3986
Similar to commita6c30873ee("ARM: 8989/1: use .fpu assembler directives instead of assembler arguments"). GCC and GNU binutils support setting the "sub arch" via -march=, -Wa,-march, target function attribute, and .arch assembler directive. Clang was missing support for -Wa,-march=, but this was implemented in clang-13. The behavior of both GCC and Clang is to prefer -Wa,-march= over -march= for assembler and assembler-with-cpp sources, but Clang will warn about the -march= being unused. clang: warning: argument unused during compilation: '-march=armv6k' [-Wunused-command-line-argument] Since most assembler is non-conditionally assembled with one sub arch (modulo arch/arm/delay-loop.S which conditionally is assembled as armv4 based on CONFIG_ARCH_RPC, and arch/arm/mach-at91/pm-suspend.S which is conditionally assembled as armv7-a based on CONFIG_CPU_V7), prefer the .arch assembler directive. Add a few more instances found in compile testing as found by Arnd and Nathan. Link:1d51c699b9Link: https://bugs.llvm.org/show_bug.cgi?id=48894 Link: https://github.com/ClangBuiltLinux/linux/issues/1195 Link: https://github.com/ClangBuiltLinux/linux/issues/1315 Suggested-by: Arnd Bergmann <arnd@arndb.de> Suggested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Tested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
304 lines
7.0 KiB
ArmAsm
304 lines
7.0 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2012, NVIDIA Corporation. All rights reserved.
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*/
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <soc/tegra/flowctrl.h>
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#include <soc/tegra/fuse.h>
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#include <asm/assembler.h>
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#include <asm/asm-offsets.h>
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#include <asm/cache.h>
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#include "iomap.h"
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#include "reset.h"
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#include "sleep.h"
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#define PMC_SCRATCH41 0x140
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.arch armv7-a
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#ifdef CONFIG_PM_SLEEP
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/*
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* tegra_resume
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*
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* CPU boot vector when restarting the a CPU following
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* an LP2 transition. Also branched to by LP0 and LP1 resume after
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* re-enabling sdram.
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*
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* r6: SoC ID
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* r8: CPU part number
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*/
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ENTRY(tegra_resume)
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check_cpu_part_num 0xc09, r8, r9
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bleq v7_invalidate_l1
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cpu_id r0
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cmp r0, #0 @ CPU0?
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THUMB( it ne )
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bne cpu_resume @ no
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tegra_get_soc_id TEGRA_APB_MISC_BASE, r6
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/* Are we on Tegra20? */
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cmp r6, #TEGRA20
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beq 1f @ Yes
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/* Clear the flow controller flags for this CPU. */
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cpu_to_csr_reg r3, r0
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mov32 r2, TEGRA_FLOW_CTRL_BASE
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ldr r1, [r2, r3]
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/* Clear event & intr flag */
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orr r1, r1, \
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#FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
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movw r0, #0x3FFD @ enable, cluster_switch, immed, bitmaps
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@ & ext flags for CPU power mgnt
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bic r1, r1, r0
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str r1, [r2, r3]
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1:
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mov32 r9, 0xc09
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cmp r8, r9
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bne end_ca9_scu_l2_resume
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#ifdef CONFIG_HAVE_ARM_SCU
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/* enable SCU */
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mov32 r0, TEGRA_ARM_PERIF_BASE
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ldr r1, [r0]
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orr r1, r1, #1
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str r1, [r0]
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#endif
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bl tegra_resume_trusted_foundations
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#ifdef CONFIG_CACHE_L2X0
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/* L2 cache resume & re-enable */
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bl l2c310_early_resume
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#endif
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end_ca9_scu_l2_resume:
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mov32 r9, 0xc0f
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cmp r8, r9
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bleq tegra_init_l2_for_a15
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b cpu_resume
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ENDPROC(tegra_resume)
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/*
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* tegra_resume_trusted_foundations
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*
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* Trusted Foundations firmware initialization.
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*
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* Doesn't return if firmware presents.
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* Corrupted registers: r1, r2
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*/
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ENTRY(tegra_resume_trusted_foundations)
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/* Check whether Trusted Foundations firmware presents. */
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mov32 r2, TEGRA_IRAM_BASE + TEGRA_IRAM_RESET_HANDLER_OFFSET
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ldr r1, =__tegra_cpu_reset_handler_data_offset + \
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RESET_DATA(TF_PRESENT)
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ldr r1, [r2, r1]
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cmp r1, #0
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reteq lr
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.arch_extension sec
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/*
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* First call after suspend wakes firmware. No arguments required
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* for some firmware versions. Downstream kernel of ASUS TF300T uses
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* r0=3 for the wake-up notification.
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*/
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mov r0, #3
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smc #0
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b cpu_resume
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ENDPROC(tegra_resume_trusted_foundations)
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#endif
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.align L1_CACHE_SHIFT
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ENTRY(__tegra_cpu_reset_handler_start)
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/*
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* __tegra_cpu_reset_handler:
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*
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* Common handler for all CPU reset events.
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*
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* Register usage within the reset handler:
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*
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* Others: scratch
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* R6 = SoC ID
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* R7 = CPU present (to the OS) mask
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* R8 = CPU in LP1 state mask
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* R9 = CPU in LP2 state mask
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* R10 = CPU number
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* R11 = CPU mask
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* R12 = pointer to reset handler data
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*
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* NOTE: This code is copied to IRAM. All code and data accesses
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* must be position-independent.
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*/
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.arm
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.align L1_CACHE_SHIFT
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ENTRY(__tegra_cpu_reset_handler)
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cpsid aif, 0x13 @ SVC mode, interrupts disabled
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tegra_get_soc_id TEGRA_APB_MISC_BASE, r6
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adr r12, __tegra_cpu_reset_handler_data
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ldr r5, [r12, #RESET_DATA(TF_PRESENT)]
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cmp r5, #0
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bne after_errata
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#ifdef CONFIG_ARCH_TEGRA_2x_SOC
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t20_check:
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cmp r6, #TEGRA20
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bne after_t20_check
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t20_errata:
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# Tegra20 is a Cortex-A9 r1p1
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mrc p15, 0, r0, c1, c0, 0 @ read system control register
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orr r0, r0, #1 << 14 @ erratum 716044
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mcr p15, 0, r0, c1, c0, 0 @ write system control register
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mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
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orr r0, r0, #1 << 4 @ erratum 742230
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orr r0, r0, #1 << 11 @ erratum 751472
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mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
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b after_errata
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after_t20_check:
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#endif
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#ifdef CONFIG_ARCH_TEGRA_3x_SOC
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t30_check:
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cmp r6, #TEGRA30
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bne after_t30_check
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t30_errata:
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# Tegra30 is a Cortex-A9 r2p9
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mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
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orr r0, r0, #1 << 6 @ erratum 743622
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orr r0, r0, #1 << 11 @ erratum 751472
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mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
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b after_errata
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after_t30_check:
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#endif
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after_errata:
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mrc p15, 0, r10, c0, c0, 5 @ MPIDR
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and r10, r10, #0x3 @ R10 = CPU number
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mov r11, #1
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mov r11, r11, lsl r10 @ R11 = CPU mask
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#ifdef CONFIG_SMP
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/* Does the OS know about this CPU? */
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ldr r7, [r12, #RESET_DATA(MASK_PRESENT)]
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tst r7, r11 @ if !present
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bleq __die @ CPU not present (to OS)
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#endif
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/* Waking up from LP1? */
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ldr r8, [r12, #RESET_DATA(MASK_LP1)]
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tst r8, r11 @ if in_lp1
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beq __is_not_lp1
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cmp r10, #0
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bne __die @ only CPU0 can be here
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ldr lr, [r12, #RESET_DATA(STARTUP_LP1)]
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cmp lr, #0
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bleq __die @ no LP1 startup handler
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THUMB( add lr, lr, #1 ) @ switch to Thumb mode
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bx lr
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__is_not_lp1:
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/* Waking up from LP2? */
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ldr r9, [r12, #RESET_DATA(MASK_LP2)]
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tst r9, r11 @ if in_lp2
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beq __is_not_lp2
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ldr lr, [r12, #RESET_DATA(STARTUP_LP2)]
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cmp lr, #0
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bleq __die @ no LP2 startup handler
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bx lr
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__is_not_lp2:
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#ifdef CONFIG_SMP
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/*
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* Can only be secondary boot (initial or hotplug)
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* CPU0 can't be here for Tegra20/30
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*/
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cmp r6, #TEGRA114
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beq __no_cpu0_chk
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cmp r10, #0
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bleq __die @ CPU0 cannot be here
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__no_cpu0_chk:
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ldr lr, [r12, #RESET_DATA(STARTUP_SECONDARY)]
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cmp lr, #0
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bleq __die @ no secondary startup handler
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bx lr
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#endif
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/*
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* We don't know why the CPU reset. Just kill it.
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* The LR register will contain the address we died at + 4.
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*/
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__die:
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sub lr, lr, #4
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mov32 r7, TEGRA_PMC_BASE
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str lr, [r7, #PMC_SCRATCH41]
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mov32 r7, TEGRA_CLK_RESET_BASE
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/* Are we on Tegra20? */
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cmp r6, #TEGRA20
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bne 1f
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#ifdef CONFIG_ARCH_TEGRA_2x_SOC
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mov32 r0, 0x1111
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mov r1, r0, lsl r10
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str r1, [r7, #0x340] @ CLK_RST_CPU_CMPLX_SET
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#endif
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1:
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#ifdef CONFIG_ARCH_TEGRA_3x_SOC
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mov32 r6, TEGRA_FLOW_CTRL_BASE
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cmp r10, #0
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moveq r1, #FLOW_CTRL_HALT_CPU0_EVENTS
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moveq r2, #FLOW_CTRL_CPU0_CSR
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movne r1, r10, lsl #3
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addne r2, r1, #(FLOW_CTRL_CPU1_CSR-8)
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addne r1, r1, #(FLOW_CTRL_HALT_CPU1_EVENTS-8)
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/* Clear CPU "event" and "interrupt" flags and power gate
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it when halting but not before it is in the "WFI" state. */
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ldr r0, [r6, +r2]
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orr r0, r0, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
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orr r0, r0, #FLOW_CTRL_CSR_ENABLE
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str r0, [r6, +r2]
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/* Unconditionally halt this CPU */
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mov r0, #FLOW_CTRL_WAITEVENT
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str r0, [r6, +r1]
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ldr r0, [r6, +r1] @ memory barrier
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dsb
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isb
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wfi @ CPU should be power gated here
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/* If the CPU didn't power gate above just kill it's clock. */
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mov r0, r11, lsl #8
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str r0, [r7, #348] @ CLK_CPU_CMPLX_SET
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#endif
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/* If the CPU still isn't dead, just spin here. */
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b .
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ENDPROC(__tegra_cpu_reset_handler)
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.align L1_CACHE_SHIFT
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.type __tegra_cpu_reset_handler_data, %object
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.globl __tegra_cpu_reset_handler_data
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.globl __tegra_cpu_reset_handler_data_offset
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.equ __tegra_cpu_reset_handler_data_offset, \
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. - __tegra_cpu_reset_handler_start
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__tegra_cpu_reset_handler_data:
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.rept TEGRA_RESET_DATA_SIZE
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.long 0
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.endr
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.align L1_CACHE_SHIFT
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ENTRY(__tegra_cpu_reset_handler_end)
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