1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * This file is part of wl1271 4 * 5 * Copyright (C) 2008-2009 Nokia Corporation 6 * 7 * Contact: Luciano Coelho <luciano.coelho@nokia.com> 8 */ 9 10 #include <linux/interrupt.h> 11 #include <linux/irq.h> 12 #include <linux/module.h> 13 #include <linux/slab.h> 14 #include <linux/swab.h> 15 #include <linux/crc7.h> 16 #include <linux/spi/spi.h> 17 #include <linux/wl12xx.h> 18 #include <linux/platform_device.h> 19 #include <linux/of_irq.h> 20 #include <linux/regulator/consumer.h> 21 22 #include "wlcore.h" 23 #include "wl12xx_80211.h" 24 #include "io.h" 25 26 #define WSPI_CMD_READ 0x40000000 27 #define WSPI_CMD_WRITE 0x00000000 28 #define WSPI_CMD_FIXED 0x20000000 29 #define WSPI_CMD_BYTE_LENGTH 0x1FFE0000 30 #define WSPI_CMD_BYTE_LENGTH_OFFSET 17 31 #define WSPI_CMD_BYTE_ADDR 0x0001FFFF 32 33 #define WSPI_INIT_CMD_CRC_LEN 5 34 35 #define WSPI_INIT_CMD_START 0x00 36 #define WSPI_INIT_CMD_TX 0x40 37 /* the extra bypass bit is sampled by the TNET as '1' */ 38 #define WSPI_INIT_CMD_BYPASS_BIT 0x80 39 #define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07 40 #define WSPI_INIT_CMD_EN_FIXEDBUSY 0x80 41 #define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00 42 #define WSPI_INIT_CMD_IOD 0x40 43 #define WSPI_INIT_CMD_IP 0x20 44 #define WSPI_INIT_CMD_CS 0x10 45 #define WSPI_INIT_CMD_WS 0x08 46 #define WSPI_INIT_CMD_WSPI 0x01 47 #define WSPI_INIT_CMD_END 0x01 48 49 #define WSPI_INIT_CMD_LEN 8 50 51 #define HW_ACCESS_WSPI_FIXED_BUSY_LEN \ 52 ((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32)) 53 #define HW_ACCESS_WSPI_INIT_CMD_MASK 0 54 55 /* HW limitation: maximum possible chunk size is 4095 bytes */ 56 #define WSPI_MAX_CHUNK_SIZE 4092 57 58 /* 59 * wl18xx driver aggregation buffer size is (13 * 4K) compared to 60 * (4 * 4K) for wl12xx, so use the larger buffer needed for wl18xx 61 */ 62 #define SPI_AGGR_BUFFER_SIZE (13 * SZ_4K) 63 64 /* Maximum number of SPI write chunks */ 65 #define WSPI_MAX_NUM_OF_CHUNKS \ 66 ((SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) + 1) 67 68 static const struct wilink_family_data wl127x_data = { 69 .name = "wl127x", 70 .nvs_name = "ti-connectivity/wl127x-nvs.bin", 71 }; 72 73 static const struct wilink_family_data wl128x_data = { 74 .name = "wl128x", 75 .nvs_name = "ti-connectivity/wl128x-nvs.bin", 76 }; 77 78 static const struct wilink_family_data wl18xx_data = { 79 .name = "wl18xx", 80 .cfg_name = "ti-connectivity/wl18xx-conf.bin", 81 .nvs_name = "ti-connectivity/wl1271-nvs.bin", 82 }; 83 84 struct wl12xx_spi_glue { 85 struct device *dev; 86 struct platform_device *core; 87 struct regulator *reg; /* Power regulator */ 88 }; 89 90 static void wl12xx_spi_reset(struct device *child) 91 { 92 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); 93 u8 *cmd; 94 struct spi_transfer t; 95 struct spi_message m; 96 97 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); 98 if (!cmd) { 99 dev_err(child->parent, 100 "could not allocate cmd for spi reset\n"); 101 return; 102 } 103 104 memset(&t, 0, sizeof(t)); 105 spi_message_init(&m); 106 107 memset(cmd, 0xff, WSPI_INIT_CMD_LEN); 108 109 t.tx_buf = cmd; 110 t.len = WSPI_INIT_CMD_LEN; 111 spi_message_add_tail(&t, &m); 112 113 spi_sync(to_spi_device(glue->dev), &m); 114 115 kfree(cmd); 116 } 117 118 static void wl12xx_spi_init(struct device *child) 119 { 120 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); 121 struct spi_transfer t; 122 struct spi_message m; 123 struct spi_device *spi = to_spi_device(glue->dev); 124 u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); 125 126 if (!cmd) { 127 dev_err(child->parent, 128 "could not allocate cmd for spi init\n"); 129 return; 130 } 131 132 memset(&t, 0, sizeof(t)); 133 spi_message_init(&m); 134 135 /* 136 * Set WSPI_INIT_COMMAND 137 * the data is being send from the MSB to LSB 138 */ 139 cmd[0] = 0xff; 140 cmd[1] = 0xff; 141 cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; 142 cmd[3] = 0; 143 cmd[4] = 0; 144 cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3; 145 cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; 146 147 cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS 148 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; 149 150 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) 151 cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; 152 else 153 cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY; 154 155 cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END; 156 157 /* 158 * The above is the logical order; it must actually be stored 159 * in the buffer byte-swapped. 160 */ 161 __swab32s((u32 *)cmd); 162 __swab32s((u32 *)cmd+1); 163 164 t.tx_buf = cmd; 165 t.len = WSPI_INIT_CMD_LEN; 166 spi_message_add_tail(&t, &m); 167 168 spi_sync(to_spi_device(glue->dev), &m); 169 170 /* Send extra clocks with inverted CS (high). this is required 171 * by the wilink family in order to successfully enter WSPI mode. 172 */ 173 spi->mode ^= SPI_CS_HIGH; 174 memset(&m, 0, sizeof(m)); 175 spi_message_init(&m); 176 177 cmd[0] = 0xff; 178 cmd[1] = 0xff; 179 cmd[2] = 0xff; 180 cmd[3] = 0xff; 181 __swab32s((u32 *)cmd); 182 183 t.tx_buf = cmd; 184 t.len = 4; 185 spi_message_add_tail(&t, &m); 186 187 spi_sync(to_spi_device(glue->dev), &m); 188 189 /* Restore chip select configration to normal */ 190 spi->mode ^= SPI_CS_HIGH; 191 kfree(cmd); 192 } 193 194 #define WL1271_BUSY_WORD_TIMEOUT 1000 195 196 static int wl12xx_spi_read_busy(struct device *child) 197 { 198 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); 199 struct wl1271 *wl = dev_get_drvdata(child); 200 struct spi_transfer t[1]; 201 struct spi_message m; 202 u32 *busy_buf; 203 int num_busy_bytes = 0; 204 205 /* 206 * Read further busy words from SPI until a non-busy word is 207 * encountered, then read the data itself into the buffer. 208 */ 209 210 num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT; 211 busy_buf = wl->buffer_busyword; 212 while (num_busy_bytes) { 213 num_busy_bytes--; 214 spi_message_init(&m); 215 memset(t, 0, sizeof(t)); 216 t[0].rx_buf = busy_buf; 217 t[0].len = sizeof(u32); 218 t[0].cs_change = true; 219 spi_message_add_tail(&t[0], &m); 220 spi_sync(to_spi_device(glue->dev), &m); 221 222 if (*busy_buf & 0x1) 223 return 0; 224 } 225 226 /* The SPI bus is unresponsive, the read failed. */ 227 dev_err(child->parent, "SPI read busy-word timeout!\n"); 228 return -ETIMEDOUT; 229 } 230 231 static int __must_check wl12xx_spi_raw_read(struct device *child, int addr, 232 void *buf, size_t len, bool fixed) 233 { 234 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); 235 struct wl1271 *wl = dev_get_drvdata(child); 236 struct spi_transfer t[2]; 237 struct spi_message m; 238 u32 *busy_buf; 239 u32 *cmd; 240 u32 chunk_len; 241 242 while (len > 0) { 243 chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len); 244 245 cmd = &wl->buffer_cmd; 246 busy_buf = wl->buffer_busyword; 247 248 *cmd = 0; 249 *cmd |= WSPI_CMD_READ; 250 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) & 251 WSPI_CMD_BYTE_LENGTH; 252 *cmd |= addr & WSPI_CMD_BYTE_ADDR; 253 254 if (fixed) 255 *cmd |= WSPI_CMD_FIXED; 256 257 spi_message_init(&m); 258 memset(t, 0, sizeof(t)); 259 260 t[0].tx_buf = cmd; 261 t[0].len = 4; 262 t[0].cs_change = true; 263 spi_message_add_tail(&t[0], &m); 264 265 /* Busy and non busy words read */ 266 t[1].rx_buf = busy_buf; 267 t[1].len = WL1271_BUSY_WORD_LEN; 268 t[1].cs_change = true; 269 spi_message_add_tail(&t[1], &m); 270 271 spi_sync(to_spi_device(glue->dev), &m); 272 273 if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) && 274 wl12xx_spi_read_busy(child)) { 275 memset(buf, 0, chunk_len); 276 return 0; 277 } 278 279 spi_message_init(&m); 280 memset(t, 0, sizeof(t)); 281 282 t[0].rx_buf = buf; 283 t[0].len = chunk_len; 284 t[0].cs_change = true; 285 spi_message_add_tail(&t[0], &m); 286 287 spi_sync(to_spi_device(glue->dev), &m); 288 289 if (!fixed) 290 addr += chunk_len; 291 buf += chunk_len; 292 len -= chunk_len; 293 } 294 295 return 0; 296 } 297 298 static int __wl12xx_spi_raw_write(struct device *child, int addr, 299 void *buf, size_t len, bool fixed) 300 { 301 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); 302 struct spi_transfer *t; 303 struct spi_message m; 304 u32 commands[WSPI_MAX_NUM_OF_CHUNKS]; /* 1 command per chunk */ 305 u32 *cmd; 306 u32 chunk_len; 307 int i; 308 309 /* SPI write buffers - 2 for each chunk */ 310 t = kzalloc(sizeof(*t) * 2 * WSPI_MAX_NUM_OF_CHUNKS, GFP_KERNEL); 311 if (!t) 312 return -ENOMEM; 313 314 WARN_ON(len > SPI_AGGR_BUFFER_SIZE); 315 316 spi_message_init(&m); 317 318 cmd = &commands[0]; 319 i = 0; 320 while (len > 0) { 321 chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len); 322 323 *cmd = 0; 324 *cmd |= WSPI_CMD_WRITE; 325 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) & 326 WSPI_CMD_BYTE_LENGTH; 327 *cmd |= addr & WSPI_CMD_BYTE_ADDR; 328 329 if (fixed) 330 *cmd |= WSPI_CMD_FIXED; 331 332 t[i].tx_buf = cmd; 333 t[i].len = sizeof(*cmd); 334 spi_message_add_tail(&t[i++], &m); 335 336 t[i].tx_buf = buf; 337 t[i].len = chunk_len; 338 spi_message_add_tail(&t[i++], &m); 339 340 if (!fixed) 341 addr += chunk_len; 342 buf += chunk_len; 343 len -= chunk_len; 344 cmd++; 345 } 346 347 spi_sync(to_spi_device(glue->dev), &m); 348 349 kfree(t); 350 return 0; 351 } 352 353 static int __must_check wl12xx_spi_raw_write(struct device *child, int addr, 354 void *buf, size_t len, bool fixed) 355 { 356 /* The ELP wakeup write may fail the first time due to internal 357 * hardware latency. It is safer to send the wakeup command twice to 358 * avoid unexpected failures. 359 */ 360 if (addr == HW_ACCESS_ELP_CTRL_REG) 361 __wl12xx_spi_raw_write(child, addr, buf, len, fixed); 362 363 return __wl12xx_spi_raw_write(child, addr, buf, len, fixed); 364 } 365 366 /** 367 * wl12xx_spi_set_power - power on/off the wl12xx unit 368 * @child: wl12xx device handle. 369 * @enable: true/false to power on/off the unit. 370 * 371 * use the WiFi enable regulator to enable/disable the WiFi unit. 372 */ 373 static int wl12xx_spi_set_power(struct device *child, bool enable) 374 { 375 int ret = 0; 376 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); 377 378 WARN_ON(!glue->reg); 379 380 /* Update regulator state */ 381 if (enable) { 382 ret = regulator_enable(glue->reg); 383 if (ret) 384 dev_err(child, "Power enable failure\n"); 385 } else { 386 ret = regulator_disable(glue->reg); 387 if (ret) 388 dev_err(child, "Power disable failure\n"); 389 } 390 391 return ret; 392 } 393 394 /** 395 * wl12xx_spi_set_block_size 396 * 397 * This function is not needed for spi mode, but need to be present. 398 * Without it defined the wlcore fallback to use the wrong packet 399 * allignment on tx. 400 */ 401 static void wl12xx_spi_set_block_size(struct device *child, 402 unsigned int blksz) 403 { 404 } 405 406 static struct wl1271_if_operations spi_ops = { 407 .read = wl12xx_spi_raw_read, 408 .write = wl12xx_spi_raw_write, 409 .reset = wl12xx_spi_reset, 410 .init = wl12xx_spi_init, 411 .power = wl12xx_spi_set_power, 412 .set_block_size = wl12xx_spi_set_block_size, 413 }; 414 415 static const struct of_device_id wlcore_spi_of_match_table[] = { 416 { .compatible = "ti,wl1271", .data = &wl127x_data}, 417 { .compatible = "ti,wl1273", .data = &wl127x_data}, 418 { .compatible = "ti,wl1281", .data = &wl128x_data}, 419 { .compatible = "ti,wl1283", .data = &wl128x_data}, 420 { .compatible = "ti,wl1285", .data = &wl128x_data}, 421 { .compatible = "ti,wl1801", .data = &wl18xx_data}, 422 { .compatible = "ti,wl1805", .data = &wl18xx_data}, 423 { .compatible = "ti,wl1807", .data = &wl18xx_data}, 424 { .compatible = "ti,wl1831", .data = &wl18xx_data}, 425 { .compatible = "ti,wl1835", .data = &wl18xx_data}, 426 { .compatible = "ti,wl1837", .data = &wl18xx_data}, 427 { } 428 }; 429 MODULE_DEVICE_TABLE(of, wlcore_spi_of_match_table); 430 431 /** 432 * wlcore_probe_of - DT node parsing. 433 * @spi: SPI slave device parameters. 434 * @res: resource parameters. 435 * @glue: wl12xx SPI bus to slave device glue parameters. 436 * @pdev_data: wlcore device parameters 437 */ 438 static int wlcore_probe_of(struct spi_device *spi, struct wl12xx_spi_glue *glue, 439 struct wlcore_platdev_data *pdev_data) 440 { 441 struct device_node *dt_node = spi->dev.of_node; 442 const struct of_device_id *of_id; 443 444 of_id = of_match_node(wlcore_spi_of_match_table, dt_node); 445 if (!of_id) 446 return -ENODEV; 447 448 pdev_data->family = of_id->data; 449 dev_info(&spi->dev, "selected chip family is %s\n", 450 pdev_data->family->name); 451 452 if (of_find_property(dt_node, "clock-xtal", NULL)) 453 pdev_data->ref_clock_xtal = true; 454 455 /* optional clock frequency params */ 456 of_property_read_u32(dt_node, "ref-clock-frequency", 457 &pdev_data->ref_clock_freq); 458 of_property_read_u32(dt_node, "tcxo-clock-frequency", 459 &pdev_data->tcxo_clock_freq); 460 461 return 0; 462 } 463 464 static int wl1271_probe(struct spi_device *spi) 465 { 466 struct wl12xx_spi_glue *glue; 467 struct wlcore_platdev_data *pdev_data; 468 struct resource res[1]; 469 int ret; 470 471 pdev_data = devm_kzalloc(&spi->dev, sizeof(*pdev_data), GFP_KERNEL); 472 if (!pdev_data) 473 return -ENOMEM; 474 475 pdev_data->if_ops = &spi_ops; 476 477 glue = devm_kzalloc(&spi->dev, sizeof(*glue), GFP_KERNEL); 478 if (!glue) { 479 dev_err(&spi->dev, "can't allocate glue\n"); 480 return -ENOMEM; 481 } 482 483 glue->dev = &spi->dev; 484 485 spi_set_drvdata(spi, glue); 486 487 /* This is the only SPI value that we need to set here, the rest 488 * comes from the board-peripherals file */ 489 spi->bits_per_word = 32; 490 491 glue->reg = devm_regulator_get(&spi->dev, "vwlan"); 492 if (PTR_ERR(glue->reg) == -EPROBE_DEFER) 493 return -EPROBE_DEFER; 494 if (IS_ERR(glue->reg)) { 495 dev_err(glue->dev, "can't get regulator\n"); 496 return PTR_ERR(glue->reg); 497 } 498 499 ret = wlcore_probe_of(spi, glue, pdev_data); 500 if (ret) { 501 dev_err(glue->dev, 502 "can't get device tree parameters (%d)\n", ret); 503 return ret; 504 } 505 506 ret = spi_setup(spi); 507 if (ret < 0) { 508 dev_err(glue->dev, "spi_setup failed\n"); 509 return ret; 510 } 511 512 glue->core = platform_device_alloc(pdev_data->family->name, 513 PLATFORM_DEVID_AUTO); 514 if (!glue->core) { 515 dev_err(glue->dev, "can't allocate platform_device\n"); 516 return -ENOMEM; 517 } 518 519 glue->core->dev.parent = &spi->dev; 520 521 memset(res, 0x00, sizeof(res)); 522 523 res[0].start = spi->irq; 524 res[0].flags = IORESOURCE_IRQ | irq_get_trigger_type(spi->irq); 525 res[0].name = "irq"; 526 527 ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res)); 528 if (ret) { 529 dev_err(glue->dev, "can't add resources\n"); 530 goto out_dev_put; 531 } 532 533 ret = platform_device_add_data(glue->core, pdev_data, 534 sizeof(*pdev_data)); 535 if (ret) { 536 dev_err(glue->dev, "can't add platform data\n"); 537 goto out_dev_put; 538 } 539 540 ret = platform_device_add(glue->core); 541 if (ret) { 542 dev_err(glue->dev, "can't register platform device\n"); 543 goto out_dev_put; 544 } 545 546 return 0; 547 548 out_dev_put: 549 platform_device_put(glue->core); 550 return ret; 551 } 552 553 static int wl1271_remove(struct spi_device *spi) 554 { 555 struct wl12xx_spi_glue *glue = spi_get_drvdata(spi); 556 557 platform_device_unregister(glue->core); 558 559 return 0; 560 } 561 562 static struct spi_driver wl1271_spi_driver = { 563 .driver = { 564 .name = "wl1271_spi", 565 .of_match_table = of_match_ptr(wlcore_spi_of_match_table), 566 }, 567 568 .probe = wl1271_probe, 569 .remove = wl1271_remove, 570 }; 571 572 module_spi_driver(wl1271_spi_driver); 573 MODULE_LICENSE("GPL"); 574 MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>"); 575 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>"); 576 MODULE_ALIAS("spi:wl1271"); 577