forked from Minki/linux
40db9367ec
As of today we guard early DSP init code with
ARC_AUX_DSP_BUILD (0x7A) BCR check to verify that we have
CPU with DSP configured. However that's not enough as in
ARCv1 CPU the same BCR (0x7A) is used for checking MUL/MAC
instructions presence.
So, let's guard DSP early init against non ARCv2.
Fixes: 4827d0cf74 ("ARC: handle DSP presence in HW")
Reported-by: Angelo Ribeiro <angelor@synopsys.com>
Suggested-by: Jose Abreu <oabreu@synopsys.com>
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
153 lines
3.8 KiB
C
153 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2020 Synopsys, Inc. (www.synopsys.com)
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*
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* Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
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*/
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#ifndef __ASM_ARC_DSP_IMPL_H
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#define __ASM_ARC_DSP_IMPL_H
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#include <asm/dsp.h>
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#define DSP_CTRL_DISABLED_ALL 0
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#ifdef __ASSEMBLY__
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/* clobbers r5 register */
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.macro DSP_EARLY_INIT
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#ifdef CONFIG_ISA_ARCV2
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lr r5, [ARC_AUX_DSP_BUILD]
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bmsk r5, r5, 7
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breq r5, 0, 1f
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mov r5, DSP_CTRL_DISABLED_ALL
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sr r5, [ARC_AUX_DSP_CTRL]
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1:
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#endif
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.endm
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/* clobbers r10, r11 registers pair */
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.macro DSP_SAVE_REGFILE_IRQ
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#if defined(CONFIG_ARC_DSP_KERNEL)
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/*
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* Drop any changes to DSP_CTRL made by userspace so userspace won't be
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* able to break kernel - reset it to DSP_CTRL_DISABLED_ALL value
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*/
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mov r10, DSP_CTRL_DISABLED_ALL
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sr r10, [ARC_AUX_DSP_CTRL]
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#elif defined(CONFIG_ARC_DSP_SAVE_RESTORE_REGS)
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/*
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* Save DSP_CTRL register and reset it to value suitable for kernel
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* (DSP_CTRL_DISABLED_ALL)
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*/
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mov r10, DSP_CTRL_DISABLED_ALL
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aex r10, [ARC_AUX_DSP_CTRL]
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st r10, [sp, PT_DSP_CTRL]
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#endif
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.endm
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/* clobbers r10, r11 registers pair */
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.macro DSP_RESTORE_REGFILE_IRQ
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#if defined(CONFIG_ARC_DSP_SAVE_RESTORE_REGS)
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ld r10, [sp, PT_DSP_CTRL]
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sr r10, [ARC_AUX_DSP_CTRL]
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#endif
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.endm
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#else /* __ASEMBLY__ */
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#include <linux/sched.h>
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#include <asm/asserts.h>
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#include <asm/switch_to.h>
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#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
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/*
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* As we save new and restore old AUX register value in the same place we
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* can optimize a bit and use AEX instruction (swap contents of an auxiliary
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* register with a core register) instead of LR + SR pair.
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*/
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#define AUX_SAVE_RESTORE(_saveto, _readfrom, _offt, _aux) \
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do { \
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long unsigned int _scratch; \
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\
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__asm__ __volatile__( \
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"ld %0, [%2, %4] \n" \
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"aex %0, [%3] \n" \
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"st %0, [%1, %4] \n" \
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: \
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"=&r" (_scratch) /* must be early clobber */ \
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: \
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"r" (_saveto), \
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"r" (_readfrom), \
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"Ir" (_aux), \
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"Ir" (_offt) \
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: \
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"memory" \
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); \
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} while (0)
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#define DSP_AUX_SAVE_RESTORE(_saveto, _readfrom, _aux) \
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AUX_SAVE_RESTORE(_saveto, _readfrom, \
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offsetof(struct dsp_callee_regs, _aux), \
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ARC_AUX_##_aux)
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static inline void dsp_save_restore(struct task_struct *prev,
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struct task_struct *next)
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{
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long unsigned int *saveto = &prev->thread.dsp.ACC0_GLO;
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long unsigned int *readfrom = &next->thread.dsp.ACC0_GLO;
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, ACC0_GLO);
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, ACC0_GHI);
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_BFLY0);
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_FFT_CTRL);
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#ifdef CONFIG_ARC_DSP_AGU_USERSPACE
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP0);
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP1);
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP2);
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP3);
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_OS0);
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_OS1);
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD0);
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD1);
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD2);
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DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD3);
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#endif /* CONFIG_ARC_DSP_AGU_USERSPACE */
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}
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#else /* !CONFIG_ARC_DSP_SAVE_RESTORE_REGS */
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#define dsp_save_restore(p, n)
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#endif /* CONFIG_ARC_DSP_SAVE_RESTORE_REGS */
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static inline bool dsp_exist(void)
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{
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struct bcr_generic bcr;
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READ_BCR(ARC_AUX_DSP_BUILD, bcr);
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return !!bcr.ver;
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}
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static inline bool agu_exist(void)
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{
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struct bcr_generic bcr;
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READ_BCR(ARC_AUX_AGU_BUILD, bcr);
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return !!bcr.ver;
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}
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static inline void dsp_config_check(void)
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{
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CHK_OPT_STRICT(CONFIG_ARC_DSP_HANDLED, dsp_exist());
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CHK_OPT_WEAK(CONFIG_ARC_DSP_AGU_USERSPACE, agu_exist());
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}
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#endif /* __ASEMBLY__ */
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#endif /* __ASM_ARC_DSP_IMPL_H */
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