1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2020 Synopsys, Inc. (www.synopsys.com) 4 * 5 * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> 6 */ 7 #ifndef __ASM_ARC_DSP_IMPL_H 8 #define __ASM_ARC_DSP_IMPL_H 9 10 #include <asm/dsp.h> 11 12 #define DSP_CTRL_DISABLED_ALL 0 13 14 #ifdef __ASSEMBLY__ 15 16 /* clobbers r5 register */ 17 .macro DSP_EARLY_INIT 18 lr r5, [ARC_AUX_DSP_BUILD] 19 bmsk r5, r5, 7 20 breq r5, 0, 1f 21 mov r5, DSP_CTRL_DISABLED_ALL 22 sr r5, [ARC_AUX_DSP_CTRL] 23 1: 24 .endm 25 26 /* clobbers r10, r11 registers pair */ 27 .macro DSP_SAVE_REGFILE_IRQ 28 #if defined(CONFIG_ARC_DSP_KERNEL) 29 /* 30 * Drop any changes to DSP_CTRL made by userspace so userspace won't be 31 * able to break kernel - reset it to DSP_CTRL_DISABLED_ALL value 32 */ 33 mov r10, DSP_CTRL_DISABLED_ALL 34 sr r10, [ARC_AUX_DSP_CTRL] 35 36 #elif defined(CONFIG_ARC_DSP_SAVE_RESTORE_REGS) 37 /* 38 * Save DSP_CTRL register and reset it to value suitable for kernel 39 * (DSP_CTRL_DISABLED_ALL) 40 */ 41 mov r10, DSP_CTRL_DISABLED_ALL 42 aex r10, [ARC_AUX_DSP_CTRL] 43 st r10, [sp, PT_DSP_CTRL] 44 45 #endif 46 .endm 47 48 /* clobbers r10, r11 registers pair */ 49 .macro DSP_RESTORE_REGFILE_IRQ 50 #if defined(CONFIG_ARC_DSP_SAVE_RESTORE_REGS) 51 ld r10, [sp, PT_DSP_CTRL] 52 sr r10, [ARC_AUX_DSP_CTRL] 53 54 #endif 55 .endm 56 57 #else /* __ASEMBLY__ */ 58 59 #include <linux/sched.h> 60 #include <asm/asserts.h> 61 #include <asm/switch_to.h> 62 63 #ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS 64 65 /* 66 * As we save new and restore old AUX register value in the same place we 67 * can optimize a bit and use AEX instruction (swap contents of an auxiliary 68 * register with a core register) instead of LR + SR pair. 69 */ 70 #define AUX_SAVE_RESTORE(_saveto, _readfrom, _offt, _aux) \ 71 do { \ 72 long unsigned int _scratch; \ 73 \ 74 __asm__ __volatile__( \ 75 "ld %0, [%2, %4] \n" \ 76 "aex %0, [%3] \n" \ 77 "st %0, [%1, %4] \n" \ 78 : \ 79 "=&r" (_scratch) /* must be early clobber */ \ 80 : \ 81 "r" (_saveto), \ 82 "r" (_readfrom), \ 83 "Ir" (_aux), \ 84 "Ir" (_offt) \ 85 : \ 86 "memory" \ 87 ); \ 88 } while (0) 89 90 #define DSP_AUX_SAVE_RESTORE(_saveto, _readfrom, _aux) \ 91 AUX_SAVE_RESTORE(_saveto, _readfrom, \ 92 offsetof(struct dsp_callee_regs, _aux), \ 93 ARC_AUX_##_aux) 94 95 static inline void dsp_save_restore(struct task_struct *prev, 96 struct task_struct *next) 97 { 98 long unsigned int *saveto = &prev->thread.dsp.ACC0_GLO; 99 long unsigned int *readfrom = &next->thread.dsp.ACC0_GLO; 100 101 DSP_AUX_SAVE_RESTORE(saveto, readfrom, ACC0_GLO); 102 DSP_AUX_SAVE_RESTORE(saveto, readfrom, ACC0_GHI); 103 104 DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_BFLY0); 105 DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_FFT_CTRL); 106 } 107 108 #else /* !CONFIG_ARC_DSP_SAVE_RESTORE_REGS */ 109 #define dsp_save_restore(p, n) 110 #endif /* CONFIG_ARC_DSP_SAVE_RESTORE_REGS */ 111 112 static inline bool dsp_exist(void) 113 { 114 struct bcr_generic bcr; 115 116 READ_BCR(ARC_AUX_DSP_BUILD, bcr); 117 return !!bcr.ver; 118 } 119 120 static inline void dsp_config_check(void) 121 { 122 CHK_OPT_STRICT(CONFIG_ARC_DSP_HANDLED, dsp_exist()); 123 } 124 125 #endif /* __ASEMBLY__ */ 126 #endif /* __ASM_ARC_DSP_IMPL_H */ 127