Sylvain Munaut | f5d7bf2 | 2020-09-14 10:23:50 +0200 | [diff] [blame] | 1 | /* |
| 2 | * e1.c |
| 3 | * |
| 4 | * Copyright (C) 2019-2020 Sylvain Munaut <tnt@246tNt.com> |
| 5 | * SPDX-License-Identifier: GPL-3.0-or-later |
| 6 | */ |
| 7 | |
| 8 | #include <stdint.h> |
| 9 | #include <stdbool.h> |
| 10 | #include <string.h> |
| 11 | |
| 12 | #include <no2usb/usb.h> |
| 13 | |
| 14 | #include "config.h" |
| 15 | #include "console.h" |
| 16 | #include "e1.h" |
| 17 | |
| 18 | #include "dma.h" |
| 19 | #include "led.h" // FIXME |
| 20 | |
| 21 | |
| 22 | // Hardware |
| 23 | // -------- |
| 24 | |
| 25 | struct e1_chan { |
| 26 | uint32_t csr; |
| 27 | uint32_t bd; |
| 28 | uint32_t _rsvd[2]; |
| 29 | } __attribute__((packed,aligned(4))); |
| 30 | |
| 31 | struct e1_core { |
| 32 | struct e1_chan rx[2]; |
| 33 | } __attribute__((packed,aligned(4))); |
| 34 | |
| 35 | #define E1_RX_CR_ENABLE (1 << 0) |
| 36 | #define E1_RX_CR_MODE_TRSP (0 << 1) |
| 37 | #define E1_RX_CR_MODE_BYTE (1 << 1) |
| 38 | #define E1_RX_CR_MODE_BFA (2 << 1) |
| 39 | #define E1_RX_CR_MODE_MFA (3 << 1) |
| 40 | #define E1_RX_CR_OVFL_CLR (1 << 12) |
| 41 | #define E1_RX_SR_ENABLED (1 << 0) |
| 42 | #define E1_RX_SR_ALIGNED (1 << 1) |
| 43 | #define E1_RX_SR_BD_IN_EMPTY (1 << 8) |
| 44 | #define E1_RX_SR_BD_IN_FULL (1 << 9) |
| 45 | #define E1_RX_SR_BD_OUT_EMPTY (1 << 10) |
| 46 | #define E1_RX_SR_BD_OUT_FULL (1 << 11) |
| 47 | #define E1_RX_SR_OVFL (1 << 12) |
| 48 | |
| 49 | #define E1_BD_VALID (1 << 15) |
| 50 | #define E1_BD_CRC1 (1 << 14) |
| 51 | #define E1_BD_CRC0 (1 << 13) |
| 52 | #define E1_BD_ADDR(x) ((x) & 0x7f) |
| 53 | #define E1_BD_ADDR_MSK 0x7f |
| 54 | #define E1_BD_ADDR_SHFT 0 |
| 55 | |
| 56 | |
| 57 | static volatile struct e1_core * const e1_regs = (void *)(E1_CORE_BASE); |
| 58 | static volatile uint8_t * const e1_data = (void *)(E1_DATA_BASE); |
| 59 | |
| 60 | |
| 61 | volatile uint8_t * |
| 62 | e1_data_ptr(int mf, int frame, int ts) |
| 63 | { |
| 64 | return &e1_data[(mf << 9) | (frame << 5) | ts]; |
| 65 | } |
| 66 | |
| 67 | unsigned int |
| 68 | e1_data_ofs(int mf, int frame, int ts) |
| 69 | { |
| 70 | return (mf << 9) | (frame << 5) | ts; |
| 71 | } |
| 72 | |
| 73 | |
| 74 | // FIFOs |
| 75 | // ----- |
| 76 | /* Note: FIFO works at 'frame' level (i.e. 32 bytes) */ |
| 77 | |
| 78 | struct e1_fifo { |
| 79 | /* Buffer zone associated with the FIFO */ |
| 80 | unsigned int base; |
| 81 | unsigned int mask; |
| 82 | |
| 83 | /* Pointers / Levels */ |
| 84 | unsigned int wptr[2]; /* 0=committed 1=allocated */ |
| 85 | unsigned int rptr[2]; /* 0=discared 1=peeked */ |
| 86 | }; |
| 87 | |
| 88 | /* Utils */ |
| 89 | static void |
| 90 | e1f_reset(struct e1_fifo *fifo, unsigned int base, unsigned int len) |
| 91 | { |
| 92 | memset(fifo, 0x00, sizeof(struct e1_fifo)); |
| 93 | fifo->base = base; |
| 94 | fifo->mask = len - 1; |
| 95 | } |
| 96 | |
| 97 | static unsigned int |
| 98 | e1f_allocd_frames(struct e1_fifo *fifo) |
| 99 | { |
| 100 | /* Number of frames that are allocated (i.e. where we can't write to) */ |
| 101 | return (fifo->wptr[1] - fifo->rptr[0]) & fifo->mask; |
| 102 | } |
| 103 | |
| 104 | static unsigned int |
| 105 | e1f_valid_frames(struct e1_fifo *fifo) |
| 106 | { |
| 107 | /* Number of valid frames */ |
| 108 | return (fifo->wptr[0] - fifo->rptr[0]) & fifo->mask; |
| 109 | } |
| 110 | |
| 111 | static unsigned int |
| 112 | e1f_unseen_frames(struct e1_fifo *fifo) |
| 113 | { |
| 114 | /* Number of valid frames that haven't been peeked yet */ |
| 115 | return (fifo->wptr[0] - fifo->rptr[1]) & fifo->mask; |
| 116 | } |
| 117 | |
| 118 | static unsigned int |
| 119 | e1f_free_frames(struct e1_fifo *fifo) |
| 120 | { |
| 121 | /* Number of frames that aren't allocated */ |
| 122 | return (fifo->rptr[0] - fifo->wptr[1] - 1) & fifo->mask; |
| 123 | } |
| 124 | |
| 125 | static unsigned int |
| 126 | e1f_ofs_to_dma(unsigned int ofs) |
| 127 | { |
| 128 | /* DMA address are 32-bits word address. Offsets are 32 byte address */ |
| 129 | return (ofs << 3); |
| 130 | } |
| 131 | |
| 132 | static unsigned int |
| 133 | e1f_ofs_to_mf(unsigned int ofs) |
| 134 | { |
| 135 | /* E1 Buffer Descriptors are always multiframe aligned */ |
| 136 | return (ofs >> 4); |
| 137 | } |
| 138 | |
| 139 | |
| 140 | /* Debug */ |
| 141 | static void |
| 142 | e1f_debug(struct e1_fifo *fifo, const char *name) |
| 143 | { |
| 144 | unsigned int la, lv, lu, lf; |
| 145 | |
| 146 | la = e1f_allocd_frames(fifo); |
| 147 | lv = e1f_valid_frames(fifo); |
| 148 | lu = e1f_unseen_frames(fifo); |
| 149 | lf = e1f_free_frames(fifo); |
| 150 | |
| 151 | printf("%s: R: %u / %u | W: %u / %u | A:%u V:%u U:%u F:%u\n", |
| 152 | name, |
| 153 | fifo->rptr[0], fifo->rptr[1], fifo->wptr[0], fifo->wptr[1], |
| 154 | la, lv, lu, lf |
| 155 | ); |
| 156 | } |
| 157 | |
| 158 | /* Frame level read/write */ |
| 159 | static unsigned int |
| 160 | e1f_frame_write(struct e1_fifo *fifo, unsigned int *ofs, unsigned int max_frames) |
| 161 | { |
| 162 | unsigned int lf, le; |
| 163 | |
| 164 | lf = e1f_free_frames(fifo); |
| 165 | le = fifo->mask - fifo->wptr[0] + 1; |
| 166 | |
| 167 | if (max_frames > le) |
| 168 | max_frames = le; |
| 169 | if (max_frames > lf) |
| 170 | max_frames = lf; |
| 171 | |
| 172 | *ofs = fifo->base + fifo->wptr[0]; |
| 173 | fifo->wptr[1] = fifo->wptr[0] = (fifo->wptr[0] + max_frames) & fifo->mask; |
| 174 | |
| 175 | return max_frames; |
| 176 | } |
| 177 | |
| 178 | static unsigned int |
Sylvain Munaut | de20fb7 | 2020-10-29 13:24:50 +0100 | [diff] [blame] | 179 | e1f_frame_read(struct e1_fifo *fifo, unsigned int *ofs, unsigned int max_frames) |
Sylvain Munaut | f5d7bf2 | 2020-09-14 10:23:50 +0200 | [diff] [blame] | 180 | { |
| 181 | unsigned int lu, le; |
| 182 | |
| 183 | lu = e1f_unseen_frames(fifo); |
| 184 | le = fifo->mask - fifo->rptr[1] + 1; |
| 185 | |
| 186 | if (max_frames > le) |
| 187 | max_frames = le; |
| 188 | if (max_frames > lu) |
| 189 | max_frames = lu; |
| 190 | |
| 191 | *ofs = fifo->base + fifo->rptr[1]; |
| 192 | fifo->rptr[0] = fifo->rptr[1] = (fifo->rptr[1] + max_frames) & fifo->mask; |
| 193 | |
| 194 | return max_frames; |
| 195 | } |
| 196 | |
| 197 | |
| 198 | /* MultiFrame level split read/write */ |
| 199 | static bool |
| 200 | e1f_multiframe_write_prepare(struct e1_fifo *fifo, unsigned int *ofs) |
| 201 | { |
| 202 | unsigned int lf; |
| 203 | |
| 204 | lf = e1f_free_frames(fifo); |
| 205 | if (lf < 16) |
| 206 | return false; |
| 207 | |
| 208 | *ofs = fifo->base + fifo->wptr[1]; |
| 209 | fifo->wptr[1] = (fifo->wptr[1] + 16) & fifo->mask; |
| 210 | |
| 211 | return true; |
| 212 | } |
| 213 | |
| 214 | static void |
| 215 | e1f_multiframe_write_commit(struct e1_fifo *fifo) |
| 216 | { |
| 217 | fifo->wptr[0] = (fifo->wptr[0] + 16) & fifo->mask; |
| 218 | } |
| 219 | |
| 220 | static bool |
| 221 | e1f_multiframe_read_peek(struct e1_fifo *fifo, unsigned int *ofs) |
| 222 | { |
| 223 | unsigned int lu; |
| 224 | |
| 225 | lu = e1f_unseen_frames(fifo); |
| 226 | if (lu < 16) |
| 227 | return false; |
| 228 | |
| 229 | *ofs = fifo->base + fifo->rptr[1]; |
| 230 | fifo->rptr[1] = (fifo->rptr[1] + 16) & fifo->mask; |
| 231 | |
| 232 | return true; |
| 233 | } |
| 234 | |
| 235 | static void |
| 236 | e1f_multiframe_read_discard(struct e1_fifo *fifo) |
| 237 | { |
| 238 | fifo->rptr[0] = (fifo->rptr[0] + 16) & fifo->mask; |
| 239 | } |
| 240 | |
| 241 | static void |
| 242 | e1f_multiframe_empty(struct e1_fifo *fifo) |
| 243 | { |
| 244 | fifo->rptr[0] = fifo->rptr[1] = (fifo->wptr[0] & ~15); |
| 245 | } |
| 246 | |
| 247 | |
| 248 | |
| 249 | // Main logic |
| 250 | // ---------- |
| 251 | |
| 252 | enum e1_pipe_state { |
| 253 | IDLE = 0, |
| 254 | BOOT = 1, |
| 255 | RUN = 2, |
| 256 | RECOVER = 3, |
| 257 | }; |
| 258 | |
| 259 | static struct { |
| 260 | struct { |
| 261 | uint32_t cr; |
| 262 | struct e1_fifo fifo; |
| 263 | short in_flight; |
| 264 | enum e1_pipe_state state; |
| 265 | uint8_t flags; |
| 266 | } rx[2]; |
| 267 | uint32_t error; |
| 268 | } g_e1; |
| 269 | |
| 270 | |
| 271 | void |
| 272 | e1_init(void) |
| 273 | { |
| 274 | /* Global state init */ |
| 275 | memset(&g_e1, 0x00, sizeof(g_e1)); |
| 276 | } |
| 277 | |
| 278 | void |
| 279 | e1_start(void) |
| 280 | { |
| 281 | /* Reset FIFOs */ |
| 282 | #ifdef BIGBUF |
| 283 | e1f_reset(&g_e1.rx[0].fifo, 0, 1024); |
| 284 | e1f_reset(&g_e1.rx[1].fifo, 1024, 1024); |
| 285 | #else |
| 286 | e1f_reset(&g_e1.rx[0].fifo, 0, 128); |
| 287 | e1f_reset(&g_e1.rx[1].fifo, 128, 128); |
| 288 | #endif |
| 289 | |
| 290 | /* Enable Rx0 */ |
| 291 | g_e1.rx[0].cr = E1_RX_CR_OVFL_CLR | |
| 292 | E1_RX_CR_MODE_MFA | |
| 293 | E1_RX_CR_ENABLE; |
| 294 | e1_regs->rx[0].csr = g_e1.rx[0].cr; |
| 295 | |
| 296 | /* Enable Rx1 */ |
| 297 | g_e1.rx[1].cr = E1_RX_CR_OVFL_CLR | |
| 298 | E1_RX_CR_MODE_MFA | |
| 299 | E1_RX_CR_ENABLE; |
| 300 | e1_regs->rx[1].csr = g_e1.rx[1].cr; |
| 301 | |
| 302 | /* State */ |
| 303 | g_e1.rx[0].state = BOOT; |
| 304 | g_e1.rx[0].in_flight = 0; |
| 305 | g_e1.rx[0].flags = 0; |
| 306 | |
| 307 | g_e1.rx[1].state = BOOT; |
| 308 | g_e1.rx[1].in_flight = 0; |
| 309 | g_e1.rx[1].flags = 0; |
| 310 | } |
| 311 | |
| 312 | void |
| 313 | e1_stop() |
| 314 | { |
| 315 | /* Disable RX0 */ |
| 316 | g_e1.rx[0].cr = 0; |
| 317 | e1_regs->rx[0].csr = g_e1.rx[0].cr; |
| 318 | |
| 319 | /* Disable RX1 */ |
| 320 | g_e1.rx[1].cr = 0; |
| 321 | e1_regs->rx[1].csr = g_e1.rx[1].cr; |
| 322 | |
| 323 | /* State */ |
| 324 | g_e1.rx[0].state = IDLE; |
| 325 | g_e1.rx[1].state = IDLE; |
| 326 | } |
| 327 | |
| 328 | |
| 329 | #include "dma.h" |
| 330 | |
| 331 | unsigned int |
| 332 | e1_rx_need_data(int chan, unsigned int usb_addr, unsigned int max_frames, unsigned int *pos) |
| 333 | { |
| 334 | unsigned int ofs; |
| 335 | int tot_frames = 0; |
| 336 | int n_frames; |
| 337 | |
| 338 | while (max_frames) { |
| 339 | /* Get some data from the FIFO */ |
| 340 | n_frames = e1f_frame_read(&g_e1.rx[chan].fifo, &ofs, max_frames); |
| 341 | if (!n_frames) |
| 342 | break; |
| 343 | |
| 344 | /* Give pos */ |
| 345 | if (pos) { |
| 346 | *pos = ofs & g_e1.rx[chan].fifo.mask; |
| 347 | pos = NULL; |
| 348 | } |
| 349 | |
| 350 | /* Copy from FIFO to USB */ |
| 351 | dma_exec(e1f_ofs_to_dma(ofs), usb_addr, n_frames * (32 / 4), false, NULL, NULL); |
| 352 | |
| 353 | /* Prepare Next */ |
| 354 | usb_addr += n_frames * (32 / 4); |
| 355 | max_frames -= n_frames; |
| 356 | tot_frames += n_frames; |
| 357 | |
| 358 | /* Wait for DMA completion */ |
| 359 | while (dma_poll()); |
| 360 | } |
| 361 | |
| 362 | return tot_frames; |
| 363 | } |
| 364 | |
| 365 | unsigned int |
| 366 | e1_rx_level(int chan) |
| 367 | { |
| 368 | return e1f_valid_frames(&g_e1.rx[chan].fifo); |
| 369 | } |
| 370 | |
| 371 | uint8_t |
| 372 | e1_get_pending_flags(int chan) |
| 373 | { |
| 374 | uint8_t f = g_e1.rx[chan].flags; |
| 375 | g_e1.rx[chan].flags = 0; |
| 376 | return f; |
| 377 | } |
| 378 | |
| 379 | |
| 380 | #define ERR_TIME 1000 |
| 381 | |
| 382 | void |
| 383 | e1_poll(void) |
| 384 | { |
| 385 | uint32_t bd; |
| 386 | unsigned int ofs; |
| 387 | int chan; |
| 388 | bool error = false; |
| 389 | |
| 390 | /* HACK: LED link status */ |
| 391 | if ((g_e1.rx[0].state == IDLE) && (g_e1.rx[1].state == IDLE)) |
| 392 | { |
| 393 | /* Static dim red */ |
| 394 | led_color(32, 0, 0); |
| 395 | led_blink(false, 0, 0); |
| 396 | } else { |
| 397 | uint32_t csr[2]; |
| 398 | |
| 399 | csr[0] = e1_regs->rx[0].csr; |
| 400 | csr[1] = e1_regs->rx[1].csr; |
| 401 | |
| 402 | if (!((csr[0] & csr[1]) & E1_RX_SR_ALIGNED)) |
| 403 | error = true; |
| 404 | |
| 405 | /* Color is current SYNC status */ |
| 406 | led_color( |
| 407 | error ? 1 : 0, |
| 408 | csr[0] & E1_RX_SR_ALIGNED ? 48 : 0, |
| 409 | csr[1] & E1_RX_SR_ALIGNED ? 112 : 0 |
| 410 | ); |
| 411 | } |
| 412 | |
| 413 | /* Active ? */ |
| 414 | if ((g_e1.rx[0].state == IDLE) && (g_e1.rx[1].state == IDLE)) |
| 415 | return; |
| 416 | |
| 417 | /* Recover any done RX BD */ |
| 418 | for (chan=0; chan<2; chan++) |
| 419 | { |
| 420 | while ( (bd = e1_regs->rx[chan].bd) & E1_BD_VALID ) { |
| 421 | /* FIXME: CRC status ? */ |
| 422 | e1f_multiframe_write_commit(&g_e1.rx[chan].fifo); |
| 423 | if ((bd & (E1_BD_CRC0 | E1_BD_CRC1)) != (E1_BD_CRC0 | E1_BD_CRC1)) { |
| 424 | printf("b: %03x\n", bd); |
| 425 | g_e1.rx[chan].flags |= 4; |
| 426 | error = true; |
| 427 | } |
| 428 | g_e1.rx[chan].in_flight--; |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | /* Handle RX */ |
| 433 | for (chan=0; chan<2; chan++) |
| 434 | { |
| 435 | /* Misalign ? */ |
| 436 | if (g_e1.rx[chan].state == RUN) { |
| 437 | if (!(e1_regs->rx[chan].csr & E1_RX_SR_ALIGNED)) { |
| 438 | printf("[!] E1 rx misalign\n"); |
| 439 | g_e1.rx[chan].state = RECOVER; |
| 440 | g_e1.rx[chan].flags |= 1; |
| 441 | error = true; |
| 442 | } |
| 443 | } |
| 444 | |
| 445 | /* Overflow ? */ |
| 446 | if (g_e1.rx[chan].state == RUN) { |
| 447 | if (e1_regs->rx[chan].csr & E1_RX_SR_OVFL) { |
| 448 | printf("[!] E1 overflow %d\n", g_e1.rx[chan].in_flight); |
| 449 | g_e1.rx[chan].state = RECOVER; |
| 450 | g_e1.rx[chan].flags |= 2; |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | /* Recover ready ? */ |
| 455 | if (g_e1.rx[chan].state == RECOVER) { |
| 456 | if (g_e1.rx[chan].in_flight != 0) |
| 457 | continue; |
| 458 | e1f_multiframe_empty(&g_e1.rx[chan].fifo); |
| 459 | } |
| 460 | |
| 461 | /* Fill new RX BD */ |
| 462 | while (g_e1.rx[chan].in_flight < 4) { |
| 463 | if (!e1f_multiframe_write_prepare(&g_e1.rx[chan].fifo, &ofs)) |
| 464 | break; |
| 465 | e1_regs->rx[chan].bd = e1f_ofs_to_mf(ofs); |
| 466 | g_e1.rx[chan].in_flight++; |
| 467 | } |
| 468 | |
| 469 | /* Clear overflow if needed */ |
| 470 | if (g_e1.rx[chan].state != RUN) { |
| 471 | e1_regs->rx[chan].csr = g_e1.rx[chan].cr | E1_RX_CR_OVFL_CLR; |
| 472 | g_e1.rx[chan].state = RUN; |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | /* Error tracking */ |
| 477 | if (error) { |
| 478 | if (!g_e1.error) { |
| 479 | printf("Error LED\n"); |
| 480 | led_blink(true, 150, 150); |
| 481 | } |
| 482 | g_e1.error = usb_get_tick() + ERR_TIME; |
| 483 | } else if (g_e1.error && (g_e1.error < usb_get_tick())) { |
| 484 | g_e1.error = 0; |
| 485 | led_blink(false, 0, 0); |
| 486 | printf("No error\n"); |
| 487 | } |
| 488 | |
| 489 | } |
| 490 | |
| 491 | void |
| 492 | e1_debug_print(bool data) |
| 493 | { |
| 494 | volatile uint8_t *p; |
| 495 | |
| 496 | puts("E1\n"); |
| 497 | printf("CSR: Rx0 %04x / Rx1 %04x\n", e1_regs->rx[0].csr, e1_regs->rx[1].csr); |
| 498 | printf("InF: Rx0 %d / Rx1 %d\n", g_e1.rx[0].in_flight, g_e1.rx[1].in_flight); |
| 499 | printf("Sta: Rx0 %d / Rx1 %d\n", g_e1.rx[0].state, g_e1.rx[1].state); |
| 500 | |
| 501 | e1f_debug(&g_e1.rx[0].fifo, "Rx0 FIFO"); |
| 502 | e1f_debug(&g_e1.rx[1].fifo, "Rx1 FIFO"); |
| 503 | |
| 504 | if (data) { |
| 505 | puts("\nE1 Data\n"); |
| 506 | for (int f=0; f<16; f++) { |
| 507 | p = e1_data_ptr(0, f, 0); |
| 508 | for (int ts=0; ts<32; ts++) |
| 509 | printf(" %02x", p[ts]); |
| 510 | printf("\n"); |
| 511 | } |
| 512 | } |
| 513 | } |