1 // SPDX-License-Identifier: GPL-2.0-only 2 // 3 // Codec driver for Microsemi ZL38060 Connected Home Audio Processor. 4 // 5 // Copyright(c) 2020 Sven Van Asbroeck 6 7 // The ZL38060 is very flexible and configurable. This driver implements only a 8 // tiny subset of the chip's possible configurations: 9 // 10 // - DSP block bypassed: DAI routed straight to DACs 11 // microphone routed straight to DAI 12 // - chip's internal clock is driven by a 12 MHz external crystal 13 // - chip's DAI connected to CPU is I2S, and bit + frame clock master 14 // - chip must be strapped for "host boot": in this mode, firmware will be 15 // provided by this driver. 16 17 #include <linux/gpio/consumer.h> 18 #include <linux/gpio/driver.h> 19 #include <linux/property.h> 20 #include <linux/spi/spi.h> 21 #include <linux/regmap.h> 22 #include <linux/module.h> 23 #include <linux/ihex.h> 24 25 #include <sound/pcm_params.h> 26 #include <sound/core.h> 27 #include <sound/pcm.h> 28 #include <sound/soc.h> 29 30 #define DRV_NAME "zl38060" 31 32 #define ZL38_RATES (SNDRV_PCM_RATE_8000 |\ 33 SNDRV_PCM_RATE_16000 |\ 34 SNDRV_PCM_RATE_48000) 35 #define ZL38_FORMATS SNDRV_PCM_FMTBIT_S16_LE 36 37 #define HBI_FIRMWARE_PAGE 0xFF 38 #define ZL38_MAX_RAW_XFER 0x100 39 40 #define REG_TDMA_CFG_CLK 0x0262 41 #define CFG_CLK_PCLK_SHIFT 4 42 #define CFG_CLK_PCLK_MASK (0x7ff << CFG_CLK_PCLK_SHIFT) 43 #define CFG_CLK_PCLK(bits) ((bits - 1) << CFG_CLK_PCLK_SHIFT) 44 #define CFG_CLK_MASTER BIT(15) 45 #define CFG_CLK_FSRATE_MASK 0x7 46 #define CFG_CLK_FSRATE_8KHZ 0x1 47 #define CFG_CLK_FSRATE_16KHZ 0x2 48 #define CFG_CLK_FSRATE_48KHZ 0x6 49 50 #define REG_CLK_CFG 0x0016 51 #define CLK_CFG_SOURCE_XTAL BIT(15) 52 53 #define REG_CLK_STATUS 0x0014 54 #define CLK_STATUS_HWRST BIT(0) 55 56 #define REG_PARAM_RESULT 0x0034 57 #define PARAM_RESULT_READY 0xD3D3 58 59 #define REG_PG255_BASE_HI 0x000C 60 #define REG_PG255_OFFS(addr) ((HBI_FIRMWARE_PAGE << 8) | (addr & 0xFF)) 61 #define REG_FWR_EXEC 0x012C 62 63 #define REG_CMD 0x0032 64 #define REG_HW_REV 0x0020 65 #define REG_FW_PROD 0x0022 66 #define REG_FW_REV 0x0024 67 68 #define REG_SEMA_FLAGS 0x0006 69 #define SEMA_FLAGS_BOOT_CMD BIT(0) 70 #define SEMA_FLAGS_APP_REBOOT BIT(1) 71 72 #define REG_HW_REV 0x0020 73 #define REG_FW_PROD 0x0022 74 #define REG_FW_REV 0x0024 75 #define REG_GPIO_DIR 0x02DC 76 #define REG_GPIO_DAT 0x02DA 77 78 #define BOOTCMD_LOAD_COMPLETE 0x000D 79 #define BOOTCMD_FW_GO 0x0008 80 81 #define FIRMWARE_MAJOR 2 82 #define FIRMWARE_MINOR 2 83 84 struct zl38_codec_priv { 85 struct device *dev; 86 struct regmap *regmap; 87 bool is_stream_in_use[2]; 88 struct gpio_chip *gpio_chip; 89 }; 90 91 static int zl38_fw_issue_command(struct regmap *regmap, u16 cmd) 92 { 93 unsigned int val; 94 int err; 95 96 err = regmap_read_poll_timeout(regmap, REG_SEMA_FLAGS, val, 97 !(val & SEMA_FLAGS_BOOT_CMD), 10000, 98 10000 * 100); 99 if (err) 100 return err; 101 err = regmap_write(regmap, REG_CMD, cmd); 102 if (err) 103 return err; 104 err = regmap_update_bits(regmap, REG_SEMA_FLAGS, SEMA_FLAGS_BOOT_CMD, 105 SEMA_FLAGS_BOOT_CMD); 106 if (err) 107 return err; 108 109 return regmap_read_poll_timeout(regmap, REG_CMD, val, !val, 10000, 110 10000 * 100); 111 } 112 113 static int zl38_fw_go(struct regmap *regmap) 114 { 115 int err; 116 117 err = zl38_fw_issue_command(regmap, BOOTCMD_LOAD_COMPLETE); 118 if (err) 119 return err; 120 121 return zl38_fw_issue_command(regmap, BOOTCMD_FW_GO); 122 } 123 124 static int zl38_fw_enter_boot_mode(struct regmap *regmap) 125 { 126 unsigned int val; 127 int err; 128 129 err = regmap_update_bits(regmap, REG_CLK_STATUS, CLK_STATUS_HWRST, 130 CLK_STATUS_HWRST); 131 if (err) 132 return err; 133 134 return regmap_read_poll_timeout(regmap, REG_PARAM_RESULT, val, 135 val == PARAM_RESULT_READY, 1000, 50000); 136 } 137 138 static int 139 zl38_fw_send_data(struct regmap *regmap, u32 addr, const void *data, u16 len) 140 { 141 __be32 addr_base = cpu_to_be32(addr & ~0xFF); 142 int err; 143 144 err = regmap_raw_write(regmap, REG_PG255_BASE_HI, &addr_base, 145 sizeof(addr_base)); 146 if (err) 147 return err; 148 return regmap_raw_write(regmap, REG_PG255_OFFS(addr), data, len); 149 } 150 151 static int zl38_fw_send_xaddr(struct regmap *regmap, const void *data) 152 { 153 /* execution address from ihex: 32-bit little endian. 154 * device register expects 32-bit big endian. 155 */ 156 u32 addr = le32_to_cpup(data); 157 __be32 baddr = cpu_to_be32(addr); 158 159 return regmap_raw_write(regmap, REG_FWR_EXEC, &baddr, sizeof(baddr)); 160 } 161 162 static int zl38_load_firmware(struct device *dev, struct regmap *regmap) 163 { 164 const struct ihex_binrec *rec; 165 const struct firmware *fw __free(firmware) = NULL; 166 u32 addr; 167 u16 len; 168 int err; 169 170 /* how to get this firmware: 171 * 1. request and download chip firmware from Microsemi 172 * (provided by Microsemi in srec format) 173 * 2. convert downloaded firmware from srec to ihex. Simple tool: 174 * https://gitlab.com/TheSven73/s3-to-irec 175 * 3. convert ihex to binary (.fw) using ihex2fw tool which is included 176 * with the Linux kernel sources 177 */ 178 err = request_ihex_firmware(&fw, "zl38060.fw", dev); 179 if (err) 180 return err; 181 err = zl38_fw_enter_boot_mode(regmap); 182 if (err) 183 return err; 184 rec = (const struct ihex_binrec *)fw->data; 185 while (rec) { 186 addr = be32_to_cpu(rec->addr); 187 len = be16_to_cpu(rec->len); 188 if (addr) { 189 /* regular data ihex record */ 190 err = zl38_fw_send_data(regmap, addr, rec->data, len); 191 } else if (len == 4) { 192 /* execution address ihex record */ 193 err = zl38_fw_send_xaddr(regmap, rec->data); 194 } else { 195 err = -EINVAL; 196 } 197 if (err) 198 return err; 199 /* next ! */ 200 rec = ihex_next_binrec(rec); 201 } 202 203 return zl38_fw_go(regmap); 204 } 205 206 207 static int zl38_software_reset(struct regmap *regmap) 208 { 209 unsigned int val; 210 int err; 211 212 err = regmap_update_bits(regmap, REG_SEMA_FLAGS, SEMA_FLAGS_APP_REBOOT, 213 SEMA_FLAGS_APP_REBOOT); 214 if (err) 215 return err; 216 217 /* wait for host bus interface to settle. 218 * Not sure if this is required: Microsemi's vendor driver does this, 219 * but the firmware manual does not mention it. Leave it in, there's 220 * little downside, apart from a slower reset. 221 */ 222 msleep(50); 223 224 return regmap_read_poll_timeout(regmap, REG_SEMA_FLAGS, val, 225 !(val & SEMA_FLAGS_APP_REBOOT), 10000, 226 10000 * 100); 227 } 228 229 static int zl38_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) 230 { 231 struct zl38_codec_priv *priv = snd_soc_dai_get_drvdata(dai); 232 int err; 233 234 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 235 case SND_SOC_DAIFMT_I2S: 236 /* firmware default is normal i2s */ 237 break; 238 default: 239 return -EINVAL; 240 } 241 242 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 243 case SND_SOC_DAIFMT_NB_NF: 244 /* firmware default is normal bitclock and frame */ 245 break; 246 default: 247 return -EINVAL; 248 } 249 250 switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) { 251 case SND_SOC_DAIFMT_CBP_CFP: 252 /* always 32 bits per frame (= 16 bits/channel, 2 channels) */ 253 err = regmap_update_bits(priv->regmap, REG_TDMA_CFG_CLK, 254 CFG_CLK_MASTER | CFG_CLK_PCLK_MASK, 255 CFG_CLK_MASTER | CFG_CLK_PCLK(32)); 256 if (err) 257 return err; 258 break; 259 default: 260 return -EINVAL; 261 } 262 263 return 0; 264 } 265 266 static int zl38_hw_params(struct snd_pcm_substream *substream, 267 struct snd_pcm_hw_params *params, 268 struct snd_soc_dai *dai) 269 { 270 struct zl38_codec_priv *priv = snd_soc_dai_get_drvdata(dai); 271 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; 272 unsigned int fsrate; 273 int err; 274 275 /* We cannot change hw_params while the dai is already in use - the 276 * software reset will corrupt the audio. However, this is not required, 277 * as the chip's TDM buses are fully symmetric, which mandates identical 278 * rates, channels, and samplebits for record and playback. 279 */ 280 if (priv->is_stream_in_use[!tx]) 281 goto skip_setup; 282 283 switch (params_rate(params)) { 284 case 8000: 285 fsrate = CFG_CLK_FSRATE_8KHZ; 286 break; 287 case 16000: 288 fsrate = CFG_CLK_FSRATE_16KHZ; 289 break; 290 case 48000: 291 fsrate = CFG_CLK_FSRATE_48KHZ; 292 break; 293 default: 294 return -EINVAL; 295 } 296 297 err = regmap_update_bits(priv->regmap, REG_TDMA_CFG_CLK, 298 CFG_CLK_FSRATE_MASK, fsrate); 299 if (err) 300 return err; 301 302 /* chip requires a software reset to apply audio register changes */ 303 err = zl38_software_reset(priv->regmap); 304 if (err) 305 return err; 306 307 skip_setup: 308 priv->is_stream_in_use[tx] = true; 309 310 return 0; 311 } 312 313 static int zl38_hw_free(struct snd_pcm_substream *substream, 314 struct snd_soc_dai *dai) 315 { 316 struct zl38_codec_priv *priv = snd_soc_dai_get_drvdata(dai); 317 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; 318 319 priv->is_stream_in_use[tx] = false; 320 321 return 0; 322 } 323 324 /* stereo bypass with no AEC */ 325 static const struct reg_sequence cp_config_stereo_bypass[] = { 326 /* interconnects must be programmed first */ 327 { 0x0210, 0x0005 }, /* DAC1 in <= I2S1-L */ 328 { 0x0212, 0x0006 }, /* DAC2 in <= I2S1-R */ 329 { 0x0214, 0x0001 }, /* I2S1-L in <= MIC1 */ 330 { 0x0216, 0x0001 }, /* I2S1-R in <= MIC1 */ 331 { 0x0224, 0x0000 }, /* AEC-S in <= n/a */ 332 { 0x0226, 0x0000 }, /* AEC-R in <= n/a */ 333 /* output enables must be programmed next */ 334 { 0x0202, 0x000F }, /* enable I2S1 + DAC */ 335 }; 336 337 static const struct snd_soc_dai_ops zl38_dai_ops = { 338 .set_fmt = zl38_set_fmt, 339 .hw_params = zl38_hw_params, 340 .hw_free = zl38_hw_free, 341 }; 342 343 static struct snd_soc_dai_driver zl38_dai = { 344 .name = "zl38060-tdma", 345 .playback = { 346 .stream_name = "Playback", 347 .channels_min = 2, 348 .channels_max = 2, 349 .rates = ZL38_RATES, 350 .formats = ZL38_FORMATS, 351 }, 352 .capture = { 353 .stream_name = "Capture", 354 .channels_min = 2, 355 .channels_max = 2, 356 .rates = ZL38_RATES, 357 .formats = ZL38_FORMATS, 358 }, 359 .ops = &zl38_dai_ops, 360 .symmetric_rate = 1, 361 .symmetric_sample_bits = 1, 362 .symmetric_channels = 1, 363 }; 364 365 static const struct snd_soc_dapm_widget zl38_dapm_widgets[] = { 366 SND_SOC_DAPM_OUTPUT("DAC1"), 367 SND_SOC_DAPM_OUTPUT("DAC2"), 368 369 SND_SOC_DAPM_INPUT("DMICL"), 370 }; 371 372 static const struct snd_soc_dapm_route zl38_dapm_routes[] = { 373 { "DAC1", NULL, "Playback" }, 374 { "DAC2", NULL, "Playback" }, 375 376 { "Capture", NULL, "DMICL" }, 377 }; 378 379 static const struct snd_soc_component_driver zl38_component_dev = { 380 .dapm_widgets = zl38_dapm_widgets, 381 .num_dapm_widgets = ARRAY_SIZE(zl38_dapm_widgets), 382 .dapm_routes = zl38_dapm_routes, 383 .num_dapm_routes = ARRAY_SIZE(zl38_dapm_routes), 384 .endianness = 1, 385 }; 386 387 static int chip_gpio_set(struct gpio_chip *c, unsigned int offset, int val) 388 { 389 struct regmap *regmap = gpiochip_get_data(c); 390 unsigned int mask = BIT(offset); 391 392 return regmap_update_bits(regmap, REG_GPIO_DAT, mask, val ? mask : 0); 393 } 394 395 static int chip_gpio_get(struct gpio_chip *c, unsigned int offset) 396 { 397 struct regmap *regmap = gpiochip_get_data(c); 398 unsigned int mask = BIT(offset); 399 unsigned int val; 400 int err; 401 402 err = regmap_read(regmap, REG_GPIO_DAT, &val); 403 if (err) 404 return err; 405 406 return !!(val & mask); 407 } 408 409 static int chip_direction_input(struct gpio_chip *c, unsigned int offset) 410 { 411 struct regmap *regmap = gpiochip_get_data(c); 412 unsigned int mask = BIT(offset); 413 414 return regmap_update_bits(regmap, REG_GPIO_DIR, mask, 0); 415 } 416 417 static int 418 chip_direction_output(struct gpio_chip *c, unsigned int offset, int val) 419 { 420 struct regmap *regmap = gpiochip_get_data(c); 421 unsigned int mask = BIT(offset); 422 int ret; 423 424 ret = chip_gpio_set(c, offset, val); 425 if (ret) 426 return ret; 427 428 return regmap_update_bits(regmap, REG_GPIO_DIR, mask, mask); 429 } 430 431 static const struct gpio_chip template_chip = { 432 .owner = THIS_MODULE, 433 .label = DRV_NAME, 434 435 .base = -1, 436 .ngpio = 14, 437 .direction_input = chip_direction_input, 438 .direction_output = chip_direction_output, 439 .get = chip_gpio_get, 440 .set = chip_gpio_set, 441 442 .can_sleep = true, 443 }; 444 445 static int zl38_check_revision(struct device *dev, struct regmap *regmap) 446 { 447 unsigned int hwrev, fwprod, fwrev; 448 int fw_major, fw_minor, fw_micro; 449 int err; 450 451 err = regmap_read(regmap, REG_HW_REV, &hwrev); 452 if (err) 453 return err; 454 err = regmap_read(regmap, REG_FW_PROD, &fwprod); 455 if (err) 456 return err; 457 err = regmap_read(regmap, REG_FW_REV, &fwrev); 458 if (err) 459 return err; 460 461 fw_major = (fwrev >> 12) & 0xF; 462 fw_minor = (fwrev >> 8) & 0xF; 463 fw_micro = fwrev & 0xFF; 464 dev_info(dev, "hw rev 0x%x, fw product code %d, firmware rev %d.%d.%d", 465 hwrev & 0x1F, fwprod, fw_major, fw_minor, fw_micro); 466 467 if (fw_major != FIRMWARE_MAJOR || fw_minor < FIRMWARE_MINOR) { 468 dev_err(dev, "unsupported firmware. driver supports %d.%d", 469 FIRMWARE_MAJOR, FIRMWARE_MINOR); 470 return -EINVAL; 471 } 472 473 return 0; 474 } 475 476 static int zl38_bus_read(void *context, 477 const void *reg_buf, size_t reg_size, 478 void *val_buf, size_t val_size) 479 { 480 struct spi_device *spi = context; 481 const u8 *reg_buf8 = reg_buf; 482 size_t len = 0; 483 u8 offs, page; 484 u8 txbuf[4]; 485 486 if (reg_size != 2 || val_size > ZL38_MAX_RAW_XFER) 487 return -EINVAL; 488 489 offs = reg_buf8[1] >> 1; 490 page = reg_buf8[0]; 491 492 if (page) { 493 txbuf[len++] = 0xFE; 494 txbuf[len++] = page == HBI_FIRMWARE_PAGE ? 0xFF : page - 1; 495 txbuf[len++] = offs; 496 txbuf[len++] = val_size / 2 - 1; 497 } else { 498 txbuf[len++] = offs | 0x80; 499 txbuf[len++] = val_size / 2 - 1; 500 } 501 502 return spi_write_then_read(spi, txbuf, len, val_buf, val_size); 503 } 504 505 static int zl38_bus_write(void *context, const void *data, size_t count) 506 { 507 struct spi_device *spi = context; 508 u8 buf[4 + ZL38_MAX_RAW_XFER]; 509 size_t val_len, len = 0; 510 const u8 *data8 = data; 511 u8 offs, page; 512 513 if (count > (2 + ZL38_MAX_RAW_XFER) || count < 4) 514 return -EINVAL; 515 val_len = count - 2; 516 offs = data8[1] >> 1; 517 page = data8[0]; 518 519 if (page) { 520 buf[len++] = 0xFE; 521 buf[len++] = page == HBI_FIRMWARE_PAGE ? 0xFF : page - 1; 522 buf[len++] = offs; 523 buf[len++] = (val_len / 2 - 1) | 0x80; 524 } else { 525 buf[len++] = offs | 0x80; 526 buf[len++] = (val_len / 2 - 1) | 0x80; 527 } 528 memcpy(buf + len, data8 + 2, val_len); 529 len += val_len; 530 531 return spi_write(spi, buf, len); 532 } 533 534 static const struct regmap_bus zl38_regmap_bus = { 535 .read = zl38_bus_read, 536 .write = zl38_bus_write, 537 .max_raw_write = ZL38_MAX_RAW_XFER, 538 .max_raw_read = ZL38_MAX_RAW_XFER, 539 }; 540 541 static const struct regmap_config zl38_regmap_conf = { 542 .reg_bits = 16, 543 .val_bits = 16, 544 .reg_stride = 2, 545 .use_single_read = true, 546 .use_single_write = true, 547 }; 548 549 static int zl38_spi_probe(struct spi_device *spi) 550 { 551 struct device *dev = &spi->dev; 552 struct zl38_codec_priv *priv; 553 struct gpio_desc *reset_gpio; 554 int err; 555 556 /* get the chip to a known state by putting it in reset */ 557 reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); 558 if (IS_ERR(reset_gpio)) 559 return PTR_ERR(reset_gpio); 560 if (reset_gpio) { 561 /* datasheet: need > 10us for a digital + analog reset */ 562 usleep_range(15, 50); 563 /* take the chip out of reset */ 564 gpiod_set_value_cansleep(reset_gpio, 0); 565 /* datasheet: need > 3ms for digital section to become stable */ 566 usleep_range(3000, 10000); 567 } 568 569 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 570 if (!priv) 571 return -ENOMEM; 572 573 priv->dev = dev; 574 dev_set_drvdata(dev, priv); 575 priv->regmap = devm_regmap_init(dev, &zl38_regmap_bus, spi, 576 &zl38_regmap_conf); 577 if (IS_ERR(priv->regmap)) 578 return PTR_ERR(priv->regmap); 579 580 err = zl38_load_firmware(dev, priv->regmap); 581 if (err) 582 return err; 583 584 err = zl38_check_revision(dev, priv->regmap); 585 if (err) 586 return err; 587 588 priv->gpio_chip = devm_kmemdup(dev, &template_chip, 589 sizeof(template_chip), GFP_KERNEL); 590 if (!priv->gpio_chip) 591 return -ENOMEM; 592 priv->gpio_chip->parent = dev; 593 err = devm_gpiochip_add_data(dev, priv->gpio_chip, priv->regmap); 594 if (err) 595 return err; 596 597 /* setup the cross-point switch for stereo bypass */ 598 err = regmap_multi_reg_write(priv->regmap, cp_config_stereo_bypass, 599 ARRAY_SIZE(cp_config_stereo_bypass)); 600 if (err) 601 return err; 602 /* setup for 12MHz crystal connected to the chip */ 603 err = regmap_update_bits(priv->regmap, REG_CLK_CFG, CLK_CFG_SOURCE_XTAL, 604 CLK_CFG_SOURCE_XTAL); 605 if (err) 606 return err; 607 608 return devm_snd_soc_register_component(dev, &zl38_component_dev, 609 &zl38_dai, 1); 610 } 611 612 static const struct of_device_id zl38_dt_ids[] __maybe_unused = { 613 { .compatible = "mscc,zl38060", }, 614 { /* sentinel */ } 615 }; 616 MODULE_DEVICE_TABLE(of, zl38_dt_ids); 617 618 static const struct spi_device_id zl38_spi_ids[] = { 619 { "zl38060", 0 }, 620 { /* sentinel */ } 621 }; 622 MODULE_DEVICE_TABLE(spi, zl38_spi_ids); 623 624 static struct spi_driver zl38060_spi_driver = { 625 .driver = { 626 .name = DRV_NAME, 627 .of_match_table = of_match_ptr(zl38_dt_ids), 628 }, 629 .probe = zl38_spi_probe, 630 .id_table = zl38_spi_ids, 631 }; 632 module_spi_driver(zl38060_spi_driver); 633 634 MODULE_DESCRIPTION("ASoC ZL38060 driver"); 635 MODULE_AUTHOR("Sven Van Asbroeck <TheSven73@gmail.com>"); 636 MODULE_LICENSE("GPL v2"); 637