1
2
3
4#include <linux/bitops.h>
5#include <linux/errno.h>
6#include <linux/kernel.h>
7#include <linux/string.h>
8#include <linux/types.h>
9
10#include "nfp_asm.h"
11
12const struct cmd_tgt_act cmd_tgt_act[__CMD_TGT_MAP_SIZE] = {
13 [CMD_TGT_WRITE8_SWAP] = { 0x02, 0x42 },
14 [CMD_TGT_WRITE32_SWAP] = { 0x02, 0x5f },
15 [CMD_TGT_READ8] = { 0x01, 0x43 },
16 [CMD_TGT_READ32] = { 0x00, 0x5c },
17 [CMD_TGT_READ32_LE] = { 0x01, 0x5c },
18 [CMD_TGT_READ32_SWAP] = { 0x02, 0x5c },
19 [CMD_TGT_READ_LE] = { 0x01, 0x40 },
20 [CMD_TGT_READ_SWAP_LE] = { 0x03, 0x40 },
21 [CMD_TGT_ADD] = { 0x00, 0x47 },
22 [CMD_TGT_ADD_IMM] = { 0x02, 0x47 },
23};
24
25static bool unreg_is_imm(u16 reg)
26{
27 return (reg & UR_REG_IMM) == UR_REG_IMM;
28}
29
30u16 br_get_offset(u64 instr)
31{
32 u16 addr_lo, addr_hi;
33
34 addr_lo = FIELD_GET(OP_BR_ADDR_LO, instr);
35 addr_hi = FIELD_GET(OP_BR_ADDR_HI, instr);
36
37 return (addr_hi * ((OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO)) + 1)) |
38 addr_lo;
39}
40
41void br_set_offset(u64 *instr, u16 offset)
42{
43 u16 addr_lo, addr_hi;
44
45 addr_lo = offset & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO));
46 addr_hi = offset != addr_lo;
47 *instr &= ~(OP_BR_ADDR_HI | OP_BR_ADDR_LO);
48 *instr |= FIELD_PREP(OP_BR_ADDR_HI, addr_hi);
49 *instr |= FIELD_PREP(OP_BR_ADDR_LO, addr_lo);
50}
51
52void br_add_offset(u64 *instr, u16 offset)
53{
54 u16 addr;
55
56 addr = br_get_offset(*instr);
57 br_set_offset(instr, addr + offset);
58}
59
60static bool immed_can_modify(u64 instr)
61{
62 if (FIELD_GET(OP_IMMED_INV, instr) ||
63 FIELD_GET(OP_IMMED_SHIFT, instr) ||
64 FIELD_GET(OP_IMMED_WIDTH, instr) != IMMED_WIDTH_ALL) {
65 pr_err("Can't decode/encode immed!\n");
66 return false;
67 }
68 return true;
69}
70
71u16 immed_get_value(u64 instr)
72{
73 u16 reg;
74
75 if (!immed_can_modify(instr))
76 return 0;
77
78 reg = FIELD_GET(OP_IMMED_A_SRC, instr);
79 if (!unreg_is_imm(reg))
80 reg = FIELD_GET(OP_IMMED_B_SRC, instr);
81
82 return (reg & 0xff) | FIELD_GET(OP_IMMED_IMM, instr) << 8;
83}
84
85void immed_set_value(u64 *instr, u16 immed)
86{
87 if (!immed_can_modify(*instr))
88 return;
89
90 if (unreg_is_imm(FIELD_GET(OP_IMMED_A_SRC, *instr))) {
91 *instr &= ~FIELD_PREP(OP_IMMED_A_SRC, 0xff);
92 *instr |= FIELD_PREP(OP_IMMED_A_SRC, immed & 0xff);
93 } else {
94 *instr &= ~FIELD_PREP(OP_IMMED_B_SRC, 0xff);
95 *instr |= FIELD_PREP(OP_IMMED_B_SRC, immed & 0xff);
96 }
97
98 *instr &= ~OP_IMMED_IMM;
99 *instr |= FIELD_PREP(OP_IMMED_IMM, immed >> 8);
100}
101
102void immed_add_value(u64 *instr, u16 offset)
103{
104 u16 val;
105
106 if (!immed_can_modify(*instr))
107 return;
108
109 val = immed_get_value(*instr);
110 immed_set_value(instr, val + offset);
111}
112
113static u16 nfp_swreg_to_unreg(swreg reg, bool is_dst)
114{
115 bool lm_id, lm_dec = false;
116 u16 val = swreg_value(reg);
117
118 switch (swreg_type(reg)) {
119 case NN_REG_GPR_A:
120 case NN_REG_GPR_B:
121 case NN_REG_GPR_BOTH:
122 return val;
123 case NN_REG_NNR:
124 return UR_REG_NN | val;
125 case NN_REG_XFER:
126 return UR_REG_XFR | val;
127 case NN_REG_LMEM:
128 lm_id = swreg_lm_idx(reg);
129
130 switch (swreg_lm_mode(reg)) {
131 case NN_LM_MOD_NONE:
132 if (val & ~UR_REG_LM_IDX_MAX) {
133 pr_err("LM offset too large\n");
134 return 0;
135 }
136 return UR_REG_LM | FIELD_PREP(UR_REG_LM_IDX, lm_id) |
137 val;
138 case NN_LM_MOD_DEC:
139 lm_dec = true;
140 fallthrough;
141 case NN_LM_MOD_INC:
142 if (val) {
143 pr_err("LM offset in inc/dev mode\n");
144 return 0;
145 }
146 return UR_REG_LM | UR_REG_LM_POST_MOD |
147 FIELD_PREP(UR_REG_LM_IDX, lm_id) |
148 FIELD_PREP(UR_REG_LM_POST_MOD_DEC, lm_dec);
149 default:
150 pr_err("bad LM mode for unrestricted operands %d\n",
151 swreg_lm_mode(reg));
152 return 0;
153 }
154 case NN_REG_IMM:
155 if (val & ~0xff) {
156 pr_err("immediate too large\n");
157 return 0;
158 }
159 return UR_REG_IMM_encode(val);
160 case NN_REG_NONE:
161 return is_dst ? UR_REG_NO_DST : REG_NONE;
162 }
163
164 pr_err("unrecognized reg encoding %08x\n", reg);
165 return 0;
166}
167
168int swreg_to_unrestricted(swreg dst, swreg lreg, swreg rreg,
169 struct nfp_insn_ur_regs *reg)
170{
171 memset(reg, 0, sizeof(*reg));
172
173
174 if (swreg_type(dst) == NN_REG_IMM)
175 return -EFAULT;
176
177 if (swreg_type(dst) == NN_REG_GPR_B)
178 reg->dst_ab = ALU_DST_B;
179 if (swreg_type(dst) == NN_REG_GPR_BOTH)
180 reg->wr_both = true;
181 reg->dst = nfp_swreg_to_unreg(dst, true);
182
183
184 if (swreg_type(lreg) == swreg_type(rreg) &&
185 swreg_type(lreg) != NN_REG_NONE)
186 return -EFAULT;
187
188 if (swreg_type(lreg) == NN_REG_GPR_B ||
189 swreg_type(rreg) == NN_REG_GPR_A) {
190 reg->areg = nfp_swreg_to_unreg(rreg, false);
191 reg->breg = nfp_swreg_to_unreg(lreg, false);
192 reg->swap = true;
193 } else {
194 reg->areg = nfp_swreg_to_unreg(lreg, false);
195 reg->breg = nfp_swreg_to_unreg(rreg, false);
196 }
197
198 reg->dst_lmextn = swreg_lmextn(dst);
199 reg->src_lmextn = swreg_lmextn(lreg) || swreg_lmextn(rreg);
200
201 return 0;
202}
203
204static u16 nfp_swreg_to_rereg(swreg reg, bool is_dst, bool has_imm8, bool *i8)
205{
206 u16 val = swreg_value(reg);
207 bool lm_id;
208
209 switch (swreg_type(reg)) {
210 case NN_REG_GPR_A:
211 case NN_REG_GPR_B:
212 case NN_REG_GPR_BOTH:
213 return val;
214 case NN_REG_XFER:
215 return RE_REG_XFR | val;
216 case NN_REG_LMEM:
217 lm_id = swreg_lm_idx(reg);
218
219 if (swreg_lm_mode(reg) != NN_LM_MOD_NONE) {
220 pr_err("bad LM mode for restricted operands %d\n",
221 swreg_lm_mode(reg));
222 return 0;
223 }
224
225 if (val & ~RE_REG_LM_IDX_MAX) {
226 pr_err("LM offset too large\n");
227 return 0;
228 }
229
230 return RE_REG_LM | FIELD_PREP(RE_REG_LM_IDX, lm_id) | val;
231 case NN_REG_IMM:
232 if (val & ~(0x7f | has_imm8 << 7)) {
233 pr_err("immediate too large\n");
234 return 0;
235 }
236 *i8 = val & 0x80;
237 return RE_REG_IMM_encode(val & 0x7f);
238 case NN_REG_NONE:
239 return is_dst ? RE_REG_NO_DST : REG_NONE;
240 case NN_REG_NNR:
241 pr_err("NNRs used with restricted encoding\n");
242 return 0;
243 }
244
245 pr_err("unrecognized reg encoding\n");
246 return 0;
247}
248
249int swreg_to_restricted(swreg dst, swreg lreg, swreg rreg,
250 struct nfp_insn_re_regs *reg, bool has_imm8)
251{
252 memset(reg, 0, sizeof(*reg));
253
254
255 if (swreg_type(dst) == NN_REG_IMM)
256 return -EFAULT;
257
258 if (swreg_type(dst) == NN_REG_GPR_B)
259 reg->dst_ab = ALU_DST_B;
260 if (swreg_type(dst) == NN_REG_GPR_BOTH)
261 reg->wr_both = true;
262 reg->dst = nfp_swreg_to_rereg(dst, true, false, NULL);
263
264
265 if (swreg_type(lreg) == swreg_type(rreg) &&
266 swreg_type(lreg) != NN_REG_NONE)
267 return -EFAULT;
268
269 if (swreg_type(lreg) == NN_REG_GPR_B ||
270 swreg_type(rreg) == NN_REG_GPR_A) {
271 reg->areg = nfp_swreg_to_rereg(rreg, false, has_imm8, ®->i8);
272 reg->breg = nfp_swreg_to_rereg(lreg, false, has_imm8, ®->i8);
273 reg->swap = true;
274 } else {
275 reg->areg = nfp_swreg_to_rereg(lreg, false, has_imm8, ®->i8);
276 reg->breg = nfp_swreg_to_rereg(rreg, false, has_imm8, ®->i8);
277 }
278
279 reg->dst_lmextn = swreg_lmextn(dst);
280 reg->src_lmextn = swreg_lmextn(lreg) || swreg_lmextn(rreg);
281
282 return 0;
283}
284
285#define NFP_USTORE_ECC_POLY_WORDS 7
286#define NFP_USTORE_OP_BITS 45
287
288static const u64 nfp_ustore_ecc_polynomials[NFP_USTORE_ECC_POLY_WORDS] = {
289 0x0ff800007fffULL,
290 0x11f801ff801fULL,
291 0x1e387e0781e1ULL,
292 0x17cb8e388e22ULL,
293 0x1af5b2c93244ULL,
294 0x1f56d5525488ULL,
295 0x0daf69a46910ULL,
296};
297
298static bool parity(u64 value)
299{
300 return hweight64(value) & 1;
301}
302
303int nfp_ustore_check_valid_no_ecc(u64 insn)
304{
305 if (insn & ~GENMASK_ULL(NFP_USTORE_OP_BITS, 0))
306 return -EINVAL;
307
308 return 0;
309}
310
311u64 nfp_ustore_calc_ecc_insn(u64 insn)
312{
313 u8 ecc = 0;
314 int i;
315
316 for (i = 0; i < NFP_USTORE_ECC_POLY_WORDS; i++)
317 ecc |= parity(nfp_ustore_ecc_polynomials[i] & insn) << i;
318
319 return insn | (u64)ecc << NFP_USTORE_OP_BITS;
320}
321
