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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2020 Synopsys, Inc. (www.synopsys.com)
4 *
5 * Author: Eugeniy Paltsev <[email protected]>
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 __ASSEMBLER__
15
16/* clobbers r5 register */
17.macro DSP_EARLY_INIT
18#ifdef CONFIG_ISA_ARCV2
19 lr r5, [ARC_AUX_DSP_BUILD]
20 bmsk r5, r5, 7
21 breq r5, 0, 1f
22 mov r5, DSP_CTRL_DISABLED_ALL
23 sr r5, [ARC_AUX_DSP_CTRL]
241:
25#endif
26.endm
27
28/* clobbers r10, r11 registers pair */
29.macro DSP_SAVE_REGFILE_IRQ
30#if defined(CONFIG_ARC_DSP_KERNEL)
31 /*
32 * Drop any changes to DSP_CTRL made by userspace so userspace won't be
33 * able to break kernel - reset it to DSP_CTRL_DISABLED_ALL value
34 */
35 mov r10, DSP_CTRL_DISABLED_ALL
36 sr r10, [ARC_AUX_DSP_CTRL]
37
38#elif defined(CONFIG_ARC_DSP_SAVE_RESTORE_REGS)
39 /*
40 * Save DSP_CTRL register and reset it to value suitable for kernel
41 * (DSP_CTRL_DISABLED_ALL)
42 */
43 mov r10, DSP_CTRL_DISABLED_ALL
44 aex r10, [ARC_AUX_DSP_CTRL]
45 st r10, [sp, PT_DSP_CTRL]
46
47#endif
48.endm
49
50/* clobbers r10, r11 registers pair */
51.macro DSP_RESTORE_REGFILE_IRQ
52#if defined(CONFIG_ARC_DSP_SAVE_RESTORE_REGS)
53 ld r10, [sp, PT_DSP_CTRL]
54 sr r10, [ARC_AUX_DSP_CTRL]
55
56#endif
57.endm
58
59#else /* __ASEMBLY__ */
60
61#include <linux/sched.h>
62#include <asm/asserts.h>
63#include <asm/switch_to.h>
64
65#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
66
67/*
68 * As we save new and restore old AUX register value in the same place we
69 * can optimize a bit and use AEX instruction (swap contents of an auxiliary
70 * register with a core register) instead of LR + SR pair.
71 */
72#define AUX_SAVE_RESTORE(_saveto, _readfrom, _offt, _aux) \
73do { \
74 long unsigned int _scratch; \
75 \
76 __asm__ __volatile__( \
77 "ld %0, [%2, %4] \n" \
78 "aex %0, [%3] \n" \
79 "st %0, [%1, %4] \n" \
80 : \
81 "=&r" (_scratch) /* must be early clobber */ \
82 : \
83 "r" (_saveto), \
84 "r" (_readfrom), \
85 "Ir" (_aux), \
86 "Ir" (_offt) \
87 : \
88 "memory" \
89 ); \
90} while (0)
91
92#define DSP_AUX_SAVE_RESTORE(_saveto, _readfrom, _aux) \
93 AUX_SAVE_RESTORE(_saveto, _readfrom, \
94 offsetof(struct dsp_callee_regs, _aux), \
95 ARC_AUX_##_aux)
96
97static inline void dsp_save_restore(struct task_struct *prev,
98 struct task_struct *next)
99{
100 long unsigned int *saveto = &prev->thread.dsp.ACC0_GLO;
101 long unsigned int *readfrom = &next->thread.dsp.ACC0_GLO;
102
103 DSP_AUX_SAVE_RESTORE(saveto, readfrom, ACC0_GLO);
104 DSP_AUX_SAVE_RESTORE(saveto, readfrom, ACC0_GHI);
105
106 DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_BFLY0);
107 DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_FFT_CTRL);
108
109#ifdef CONFIG_ARC_DSP_AGU_USERSPACE
110 DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP0);
111 DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP1);
112 DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP2);
113 DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP3);
114
115 DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_OS0);
116 DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_OS1);
117
118 DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD0);
119 DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD1);
120 DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD2);
121 DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD3);
122#endif /* CONFIG_ARC_DSP_AGU_USERSPACE */
123}
124
125#else /* !CONFIG_ARC_DSP_SAVE_RESTORE_REGS */
126#define dsp_save_restore(p, n)
127#endif /* CONFIG_ARC_DSP_SAVE_RESTORE_REGS */
128
129static inline bool dsp_exist(void)
130{
131 struct bcr_generic bcr;
132
133 READ_BCR(ARC_AUX_DSP_BUILD, bcr);
134 return !!bcr.ver;
135}
136
137static inline bool agu_exist(void)
138{
139 struct bcr_generic bcr;
140
141 READ_BCR(ARC_AUX_AGU_BUILD, bcr);
142 return !!bcr.ver;
143}
144
145static inline void dsp_config_check(void)
146{
147 CHK_OPT_STRICT(CONFIG_ARC_DSP_HANDLED, dsp_exist());
148 CHK_OPT_WEAK(CONFIG_ARC_DSP_AGU_USERSPACE, agu_exist());
149}
150
151#endif /* __ASEMBLY__ */
152#endif /* __ASM_ARC_DSP_IMPL_H */