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1/*
2 * Copyright (C) 2013 Imagination Technologies
3 * Author: Paul Burton <paul.burton@imgtec.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 */
10#ifndef _ASM_MSA_H
11#define _ASM_MSA_H
12
13#include <asm/mipsregs.h>
14
15#ifndef __ASSEMBLY__
16
17#include <asm/inst.h>
18
19extern void _save_msa(struct task_struct *);
20extern void _restore_msa(struct task_struct *);
21extern void _init_msa_upper(void);
22
23extern void read_msa_wr_b(unsigned idx, union fpureg *to);
24extern void read_msa_wr_h(unsigned idx, union fpureg *to);
25extern void read_msa_wr_w(unsigned idx, union fpureg *to);
26extern void read_msa_wr_d(unsigned idx, union fpureg *to);
27
28/**
29 * read_msa_wr() - Read a single MSA vector register
30 * @idx: The index of the vector register to read
31 * @to: The FPU register union to store the registers value in
32 * @fmt: The format of the data in the vector register
33 *
34 * Read the value of MSA vector register idx into the FPU register
35 * union to, using the format fmt.
36 */
37static inline void read_msa_wr(unsigned idx, union fpureg *to,
38 enum msa_2b_fmt fmt)
39{
40 switch (fmt) {
41 case msa_fmt_b:
42 read_msa_wr_b(idx, to);
43 break;
44
45 case msa_fmt_h:
46 read_msa_wr_h(idx, to);
47 break;
48
49 case msa_fmt_w:
50 read_msa_wr_w(idx, to);
51 break;
52
53 case msa_fmt_d:
54 read_msa_wr_d(idx, to);
55 break;
56
57 default:
58 BUG();
59 }
60}
61
62extern void write_msa_wr_b(unsigned idx, union fpureg *from);
63extern void write_msa_wr_h(unsigned idx, union fpureg *from);
64extern void write_msa_wr_w(unsigned idx, union fpureg *from);
65extern void write_msa_wr_d(unsigned idx, union fpureg *from);
66
67/**
68 * write_msa_wr() - Write a single MSA vector register
69 * @idx: The index of the vector register to write
70 * @from: The FPU register union to take the registers value from
71 * @fmt: The format of the data in the vector register
72 *
73 * Write the value from the FPU register union from into MSA vector
74 * register idx, using the format fmt.
75 */
76static inline void write_msa_wr(unsigned idx, union fpureg *from,
77 enum msa_2b_fmt fmt)
78{
79 switch (fmt) {
80 case msa_fmt_b:
81 write_msa_wr_b(idx, from);
82 break;
83
84 case msa_fmt_h:
85 write_msa_wr_h(idx, from);
86 break;
87
88 case msa_fmt_w:
89 write_msa_wr_w(idx, from);
90 break;
91
92 case msa_fmt_d:
93 write_msa_wr_d(idx, from);
94 break;
95
96 default:
97 BUG();
98 }
99}
100
101static inline void enable_msa(void)
102{
103 if (cpu_has_msa) {
104 set_c0_config5(MIPS_CONF5_MSAEN);
105 enable_fpu_hazard();
106 }
107}
108
109static inline void disable_msa(void)
110{
111 if (cpu_has_msa) {
112 clear_c0_config5(MIPS_CONF5_MSAEN);
113 disable_fpu_hazard();
114 }
115}
116
117static inline int is_msa_enabled(void)
118{
119 if (!cpu_has_msa)
120 return 0;
121
122 return read_c0_config5() & MIPS_CONF5_MSAEN;
123}
124
125static inline int thread_msa_context_live(void)
126{
127 /*
128 * Check cpu_has_msa only if it's a constant. This will allow the
129 * compiler to optimise out code for CPUs without MSA without adding
130 * an extra redundant check for CPUs with MSA.
131 */
132 if (__builtin_constant_p(cpu_has_msa) && !cpu_has_msa)
133 return 0;
134
135 return test_thread_flag(TIF_MSA_CTX_LIVE);
136}
137
138static inline void save_msa(struct task_struct *t)
139{
140 if (cpu_has_msa)
141 _save_msa(t);
142}
143
144static inline void restore_msa(struct task_struct *t)
145{
146 if (cpu_has_msa)
147 _restore_msa(t);
148}
149
150#ifdef TOOLCHAIN_SUPPORTS_MSA
151
152#define __BUILD_MSA_CTL_REG(name, cs) \
153static inline unsigned int read_msa_##name(void) \
154{ \
155 unsigned int reg; \
156 __asm__ __volatile__( \
157 " .set push\n" \
158 " .set msa\n" \
159 " cfcmsa %0, $" #cs "\n" \
160 " .set pop\n" \
161 : "=r"(reg)); \
162 return reg; \
163} \
164 \
165static inline void write_msa_##name(unsigned int val) \
166{ \
167 __asm__ __volatile__( \
168 " .set push\n" \
169 " .set msa\n" \
170 " ctcmsa $" #cs ", %0\n" \
171 " .set pop\n" \
172 : : "r"(val)); \
173}
174
175#else /* !TOOLCHAIN_SUPPORTS_MSA */
176
177/*
178 * Define functions using .word for the c[ft]cmsa instructions in order to
179 * allow compilation with toolchains that do not support MSA. Once all
180 * toolchains in use support MSA these can be removed.
181 */
182#ifdef CONFIG_CPU_MICROMIPS
183#define CFC_MSA_INSN 0x587e0056
184#define CTC_MSA_INSN 0x583e0816
185#else
186#define CFC_MSA_INSN 0x787e0059
187#define CTC_MSA_INSN 0x783e0819
188#endif
189
190#define __BUILD_MSA_CTL_REG(name, cs) \
191static inline unsigned int read_msa_##name(void) \
192{ \
193 unsigned int reg; \
194 __asm__ __volatile__( \
195 " .set push\n" \
196 " .set noat\n" \
197 " .insn\n" \
198 " .word %1 | (" #cs " << 11)\n" \
199 " move %0, $1\n" \
200 " .set pop\n" \
201 : "=r"(reg) : "i"(CFC_MSA_INSN)); \
202 return reg; \
203} \
204 \
205static inline void write_msa_##name(unsigned int val) \
206{ \
207 __asm__ __volatile__( \
208 " .set push\n" \
209 " .set noat\n" \
210 " move $1, %0\n" \
211 " .insn\n" \
212 " .word %1 | (" #cs " << 6)\n" \
213 " .set pop\n" \
214 : : "r"(val), "i"(CTC_MSA_INSN)); \
215}
216
217#endif /* !TOOLCHAIN_SUPPORTS_MSA */
218
219__BUILD_MSA_CTL_REG(ir, 0)
220__BUILD_MSA_CTL_REG(csr, 1)
221__BUILD_MSA_CTL_REG(access, 2)
222__BUILD_MSA_CTL_REG(save, 3)
223__BUILD_MSA_CTL_REG(modify, 4)
224__BUILD_MSA_CTL_REG(request, 5)
225__BUILD_MSA_CTL_REG(map, 6)
226__BUILD_MSA_CTL_REG(unmap, 7)
227
228#endif /* !__ASSEMBLY__ */
229
230#define MSA_IR 0
231#define MSA_CSR 1
232#define MSA_ACCESS 2
233#define MSA_SAVE 3
234#define MSA_MODIFY 4
235#define MSA_REQUEST 5
236#define MSA_MAP 6
237#define MSA_UNMAP 7
238
239/* MSA Implementation Register (MSAIR) */
240#define MSA_IR_REVB 0
241#define MSA_IR_REVF (_ULCAST_(0xff) << MSA_IR_REVB)
242#define MSA_IR_PROCB 8
243#define MSA_IR_PROCF (_ULCAST_(0xff) << MSA_IR_PROCB)
244#define MSA_IR_WRPB 16
245#define MSA_IR_WRPF (_ULCAST_(0x1) << MSA_IR_WRPB)
246
247/* MSA Control & Status Register (MSACSR) */
248#define MSA_CSR_RMB 0
249#define MSA_CSR_RMF (_ULCAST_(0x3) << MSA_CSR_RMB)
250#define MSA_CSR_RM_NEAREST 0
251#define MSA_CSR_RM_TO_ZERO 1
252#define MSA_CSR_RM_TO_POS 2
253#define MSA_CSR_RM_TO_NEG 3
254#define MSA_CSR_FLAGSB 2
255#define MSA_CSR_FLAGSF (_ULCAST_(0x1f) << MSA_CSR_FLAGSB)
256#define MSA_CSR_FLAGS_IB 2
257#define MSA_CSR_FLAGS_IF (_ULCAST_(0x1) << MSA_CSR_FLAGS_IB)
258#define MSA_CSR_FLAGS_UB 3
259#define MSA_CSR_FLAGS_UF (_ULCAST_(0x1) << MSA_CSR_FLAGS_UB)
260#define MSA_CSR_FLAGS_OB 4
261#define MSA_CSR_FLAGS_OF (_ULCAST_(0x1) << MSA_CSR_FLAGS_OB)
262#define MSA_CSR_FLAGS_ZB 5
263#define MSA_CSR_FLAGS_ZF (_ULCAST_(0x1) << MSA_CSR_FLAGS_ZB)
264#define MSA_CSR_FLAGS_VB 6
265#define MSA_CSR_FLAGS_VF (_ULCAST_(0x1) << MSA_CSR_FLAGS_VB)
266#define MSA_CSR_ENABLESB 7
267#define MSA_CSR_ENABLESF (_ULCAST_(0x1f) << MSA_CSR_ENABLESB)
268#define MSA_CSR_ENABLES_IB 7
269#define MSA_CSR_ENABLES_IF (_ULCAST_(0x1) << MSA_CSR_ENABLES_IB)
270#define MSA_CSR_ENABLES_UB 8
271#define MSA_CSR_ENABLES_UF (_ULCAST_(0x1) << MSA_CSR_ENABLES_UB)
272#define MSA_CSR_ENABLES_OB 9
273#define MSA_CSR_ENABLES_OF (_ULCAST_(0x1) << MSA_CSR_ENABLES_OB)
274#define MSA_CSR_ENABLES_ZB 10
275#define MSA_CSR_ENABLES_ZF (_ULCAST_(0x1) << MSA_CSR_ENABLES_ZB)
276#define MSA_CSR_ENABLES_VB 11
277#define MSA_CSR_ENABLES_VF (_ULCAST_(0x1) << MSA_CSR_ENABLES_VB)
278#define MSA_CSR_CAUSEB 12
279#define MSA_CSR_CAUSEF (_ULCAST_(0x3f) << MSA_CSR_CAUSEB)
280#define MSA_CSR_CAUSE_IB 12
281#define MSA_CSR_CAUSE_IF (_ULCAST_(0x1) << MSA_CSR_CAUSE_IB)
282#define MSA_CSR_CAUSE_UB 13
283#define MSA_CSR_CAUSE_UF (_ULCAST_(0x1) << MSA_CSR_CAUSE_UB)
284#define MSA_CSR_CAUSE_OB 14
285#define MSA_CSR_CAUSE_OF (_ULCAST_(0x1) << MSA_CSR_CAUSE_OB)
286#define MSA_CSR_CAUSE_ZB 15
287#define MSA_CSR_CAUSE_ZF (_ULCAST_(0x1) << MSA_CSR_CAUSE_ZB)
288#define MSA_CSR_CAUSE_VB 16
289#define MSA_CSR_CAUSE_VF (_ULCAST_(0x1) << MSA_CSR_CAUSE_VB)
290#define MSA_CSR_CAUSE_EB 17
291#define MSA_CSR_CAUSE_EF (_ULCAST_(0x1) << MSA_CSR_CAUSE_EB)
292#define MSA_CSR_NXB 18
293#define MSA_CSR_NXF (_ULCAST_(0x1) << MSA_CSR_NXB)
294#define MSA_CSR_FSB 24
295#define MSA_CSR_FSF (_ULCAST_(0x1) << MSA_CSR_FSB)
296
297#endif /* _ASM_MSA_H */