1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * TC358746 - Parallel <-> CSI-2 Bridge 4 * 5 * Copyright 2022 Marco Felsch <kernel@pengutronix.de> 6 * 7 * Notes: 8 * - Currently only 'Parallel-in -> CSI-out' mode is supported! 9 */ 10 11 #include <linux/bitfield.h> 12 #include <linux/clk.h> 13 #include <linux/clk-provider.h> 14 #include <linux/delay.h> 15 #include <linux/i2c.h> 16 #include <linux/interrupt.h> 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/phy/phy-mipi-dphy.h> 20 #include <linux/property.h> 21 #include <linux/pm_runtime.h> 22 #include <linux/regmap.h> 23 #include <linux/units.h> 24 #include <media/v4l2-ctrls.h> 25 #include <media/v4l2-device.h> 26 #include <media/v4l2-fwnode.h> 27 #include <media/v4l2-mc.h> 28 29 /* 16-bit registers */ 30 #define CHIPID_REG 0x0000 31 #define CHIPID GENMASK(15, 8) 32 33 #define SYSCTL_REG 0x0002 34 #define SRESET BIT(0) 35 36 #define CONFCTL_REG 0x0004 37 #define PDATAF_MASK GENMASK(9, 8) 38 #define PDATAF_MODE0 0 39 #define PDATAF_MODE1 1 40 #define PDATAF_MODE2 2 41 #define PDATAF(val) FIELD_PREP(PDATAF_MASK, (val)) 42 #define PPEN BIT(6) 43 #define DATALANE_MASK GENMASK(1, 0) 44 45 #define FIFOCTL_REG 0x0006 46 #define DATAFMT_REG 0x0008 47 #define PDFMT(val) FIELD_PREP(GENMASK(7, 4), (val)) 48 49 #define MCLKCTL_REG 0x000c 50 #define MCLK_HIGH_MASK GENMASK(15, 8) 51 #define MCLK_LOW_MASK GENMASK(7, 0) 52 #define MCLK_HIGH(val) FIELD_PREP(MCLK_HIGH_MASK, (val)) 53 #define MCLK_LOW(val) FIELD_PREP(MCLK_LOW_MASK, (val)) 54 55 #define PLLCTL0_REG 0x0016 56 #define PLL_PRD_MASK GENMASK(15, 12) 57 #define PLL_PRD(val) FIELD_PREP(PLL_PRD_MASK, (val)) 58 #define PLL_FBD_MASK GENMASK(8, 0) 59 #define PLL_FBD(val) FIELD_PREP(PLL_FBD_MASK, (val)) 60 61 #define PLLCTL1_REG 0x0018 62 #define PLL_FRS_MASK GENMASK(11, 10) 63 #define PLL_FRS(val) FIELD_PREP(PLL_FRS_MASK, (val)) 64 #define CKEN BIT(4) 65 #define RESETB BIT(1) 66 #define PLL_EN BIT(0) 67 68 #define CLKCTL_REG 0x0020 69 #define MCLKDIV_MASK GENMASK(3, 2) 70 #define MCLKDIV(val) FIELD_PREP(MCLKDIV_MASK, (val)) 71 #define MCLKDIV_8 0 72 #define MCLKDIV_4 1 73 #define MCLKDIV_2 2 74 75 #define WORDCNT_REG 0x0022 76 #define PP_MISC_REG 0x0032 77 #define FRMSTOP BIT(15) 78 #define RSTPTR BIT(14) 79 80 /* 32-bit registers */ 81 #define CLW_DPHYCONTTX_REG 0x0100 82 #define CLW_CNTRL_REG 0x0140 83 #define D0W_CNTRL_REG 0x0144 84 #define LANEDISABLE BIT(0) 85 86 #define STARTCNTRL_REG 0x0204 87 #define START BIT(0) 88 89 #define LINEINITCNT_REG 0x0210 90 #define LPTXTIMECNT_REG 0x0214 91 #define TCLK_HEADERCNT_REG 0x0218 92 #define TCLK_ZEROCNT(val) FIELD_PREP(GENMASK(15, 8), (val)) 93 #define TCLK_PREPARECNT(val) FIELD_PREP(GENMASK(6, 0), (val)) 94 95 #define TCLK_TRAILCNT_REG 0x021C 96 #define THS_HEADERCNT_REG 0x0220 97 #define THS_ZEROCNT(val) FIELD_PREP(GENMASK(14, 8), (val)) 98 #define THS_PREPARECNT(val) FIELD_PREP(GENMASK(6, 0), (val)) 99 100 #define TWAKEUP_REG 0x0224 101 #define TCLK_POSTCNT_REG 0x0228 102 #define THS_TRAILCNT_REG 0x022C 103 #define HSTXVREGEN_REG 0x0234 104 #define TXOPTIONCNTRL_REG 0x0238 105 #define CSI_CONTROL_REG 0x040C 106 #define CSI_MODE BIT(15) 107 #define TXHSMD BIT(7) 108 #define NOL(val) FIELD_PREP(GENMASK(2, 1), (val)) 109 110 #define CSI_CONFW_REG 0x0500 111 #define MODE(val) FIELD_PREP(GENMASK(31, 29), (val)) 112 #define MODE_SET 0x5 113 #define ADDRESS(val) FIELD_PREP(GENMASK(28, 24), (val)) 114 #define CSI_CONTROL_ADDRESS 0x3 115 #define DATA(val) FIELD_PREP(GENMASK(15, 0), (val)) 116 117 #define CSI_START_REG 0x0518 118 #define STRT BIT(0) 119 120 static const struct v4l2_mbus_framefmt tc358746_def_fmt = { 121 .width = 640, 122 .height = 480, 123 .code = MEDIA_BUS_FMT_UYVY8_2X8, 124 .field = V4L2_FIELD_NONE, 125 .colorspace = V4L2_COLORSPACE_DEFAULT, 126 .ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT, 127 .quantization = V4L2_QUANTIZATION_DEFAULT, 128 .xfer_func = V4L2_XFER_FUNC_DEFAULT, 129 }; 130 131 static const char * const tc358746_supplies[] = { 132 "vddc", "vddio", "vddmipi" 133 }; 134 135 enum { 136 TC358746_SINK, 137 TC358746_SOURCE, 138 TC358746_NR_PADS 139 }; 140 141 struct tc358746 { 142 struct v4l2_subdev sd; 143 struct media_pad pads[TC358746_NR_PADS]; 144 struct v4l2_async_notifier notifier; 145 struct v4l2_fwnode_endpoint csi_vep; 146 147 struct v4l2_ctrl_handler ctrl_hdl; 148 149 struct regmap *regmap; 150 struct clk *refclk; 151 struct gpio_desc *reset_gpio; 152 struct regulator_bulk_data supplies[ARRAY_SIZE(tc358746_supplies)]; 153 154 struct clk_hw mclk_hw; 155 unsigned long mclk_rate; 156 u8 mclk_prediv; 157 u16 mclk_postdiv; 158 159 unsigned long pll_rate; 160 u8 pll_post_div; 161 u16 pll_pre_div; 162 u16 pll_mul; 163 164 #define TC358746_VB_MAX_SIZE (511 * 32) 165 #define TC358746_VB_DEFAULT_SIZE (1 * 32) 166 unsigned int vb_size; /* Video buffer size in bits */ 167 168 struct phy_configure_opts_mipi_dphy dphy_cfg; 169 }; 170 171 static inline struct tc358746 *to_tc358746(struct v4l2_subdev *sd) 172 { 173 return container_of(sd, struct tc358746, sd); 174 } 175 176 static inline struct tc358746 *clk_hw_to_tc358746(struct clk_hw *hw) 177 { 178 return container_of(hw, struct tc358746, mclk_hw); 179 } 180 181 struct tc358746_format { 182 u32 code; 183 bool csi_format; 184 unsigned char bus_width; 185 unsigned char bpp; 186 /* Register values */ 187 u8 pdformat; /* Peripheral Data Format */ 188 u8 pdataf; /* Parallel Data Format Option */ 189 }; 190 191 enum { 192 PDFORMAT_RAW8 = 0, 193 PDFORMAT_RAW10, 194 PDFORMAT_RAW12, 195 PDFORMAT_RGB888, 196 PDFORMAT_RGB666, 197 PDFORMAT_RGB565, 198 PDFORMAT_YUV422_8BIT, 199 /* RESERVED = 7 */ 200 PDFORMAT_RAW14 = 8, 201 PDFORMAT_YUV422_10BIT, 202 PDFORMAT_YUV444, 203 }; 204 205 /* Check tc358746_src_mbus_code() if you add new formats */ 206 static const struct tc358746_format tc358746_formats[] = { 207 { 208 .code = MEDIA_BUS_FMT_UYVY8_2X8, 209 .bus_width = 8, 210 .bpp = 16, 211 .pdformat = PDFORMAT_YUV422_8BIT, 212 .pdataf = PDATAF_MODE0, 213 }, { 214 .code = MEDIA_BUS_FMT_UYVY8_1X16, 215 .csi_format = true, 216 .bus_width = 16, 217 .bpp = 16, 218 .pdformat = PDFORMAT_YUV422_8BIT, 219 .pdataf = PDATAF_MODE1, 220 }, { 221 .code = MEDIA_BUS_FMT_YUYV8_1X16, 222 .csi_format = true, 223 .bus_width = 16, 224 .bpp = 16, 225 .pdformat = PDFORMAT_YUV422_8BIT, 226 .pdataf = PDATAF_MODE2, 227 }, { 228 .code = MEDIA_BUS_FMT_UYVY10_2X10, 229 .bus_width = 10, 230 .bpp = 20, 231 .pdformat = PDFORMAT_YUV422_10BIT, 232 .pdataf = PDATAF_MODE0, /* don't care */ 233 } 234 }; 235 236 /* Get n-th format for pad */ 237 static const struct tc358746_format * 238 tc358746_get_format_by_idx(unsigned int pad, unsigned int index) 239 { 240 unsigned int idx = 0; 241 unsigned int i; 242 243 for (i = 0; i < ARRAY_SIZE(tc358746_formats); i++) { 244 const struct tc358746_format *fmt = &tc358746_formats[i]; 245 246 if ((pad == TC358746_SOURCE && fmt->csi_format) || 247 (pad == TC358746_SINK)) { 248 if (idx == index) 249 return fmt; 250 idx++; 251 } 252 } 253 254 return ERR_PTR(-EINVAL); 255 } 256 257 static const struct tc358746_format * 258 tc358746_get_format_by_code(unsigned int pad, u32 code) 259 { 260 unsigned int i; 261 262 for (i = 0; i < ARRAY_SIZE(tc358746_formats); i++) { 263 const struct tc358746_format *fmt = &tc358746_formats[i]; 264 265 if (pad == TC358746_SINK && fmt->code == code) 266 return fmt; 267 268 if (pad == TC358746_SOURCE && !fmt->csi_format) 269 continue; 270 271 if (fmt->code == code) 272 return fmt; 273 } 274 275 return ERR_PTR(-EINVAL); 276 } 277 278 static u32 tc358746_src_mbus_code(u32 code) 279 { 280 switch (code) { 281 case MEDIA_BUS_FMT_UYVY8_2X8: 282 return MEDIA_BUS_FMT_UYVY8_1X16; 283 case MEDIA_BUS_FMT_UYVY10_2X10: 284 return MEDIA_BUS_FMT_UYVY10_1X20; 285 default: 286 return code; 287 } 288 } 289 290 static bool tc358746_valid_reg(struct device *dev, unsigned int reg) 291 { 292 switch (reg) { 293 case CHIPID_REG ... CSI_START_REG: 294 return true; 295 default: 296 return false; 297 } 298 } 299 300 static const struct regmap_config tc358746_regmap_config = { 301 .name = "tc358746", 302 .reg_bits = 16, 303 .val_bits = 16, 304 .max_register = CSI_START_REG, 305 .writeable_reg = tc358746_valid_reg, 306 .readable_reg = tc358746_valid_reg, 307 .reg_format_endian = REGMAP_ENDIAN_BIG, 308 .val_format_endian = REGMAP_ENDIAN_BIG, 309 }; 310 311 static int tc358746_write(struct tc358746 *tc358746, u32 reg, u32 val) 312 { 313 size_t count; 314 int err; 315 316 /* 32-bit registers starting from CLW_DPHYCONTTX */ 317 count = reg < CLW_DPHYCONTTX_REG ? 1 : 2; 318 319 err = regmap_bulk_write(tc358746->regmap, reg, &val, count); 320 if (err) 321 dev_err(tc358746->sd.dev, 322 "Failed to write reg:0x%04x err:%d\n", reg, err); 323 324 return err; 325 } 326 327 static int tc358746_read(struct tc358746 *tc358746, u32 reg, u32 *val) 328 { 329 size_t count; 330 int err; 331 332 /* 32-bit registers starting from CLW_DPHYCONTTX */ 333 count = reg < CLW_DPHYCONTTX_REG ? 1 : 2; 334 *val = 0; 335 336 err = regmap_bulk_read(tc358746->regmap, reg, val, count); 337 if (err) 338 dev_err(tc358746->sd.dev, 339 "Failed to read reg:0x%04x err:%d\n", reg, err); 340 341 return err; 342 } 343 344 static int 345 tc358746_update_bits(struct tc358746 *tc358746, u32 reg, u32 mask, u32 val) 346 { 347 u32 tmp, orig; 348 int err; 349 350 err = tc358746_read(tc358746, reg, &orig); 351 if (err) 352 return err; 353 354 tmp = orig & ~mask; 355 tmp |= val & mask; 356 357 return tc358746_write(tc358746, reg, tmp); 358 } 359 360 static int tc358746_set_bits(struct tc358746 *tc358746, u32 reg, u32 bits) 361 { 362 return tc358746_update_bits(tc358746, reg, bits, bits); 363 } 364 365 static int tc358746_clear_bits(struct tc358746 *tc358746, u32 reg, u32 bits) 366 { 367 return tc358746_update_bits(tc358746, reg, bits, 0); 368 } 369 370 static int tc358746_sw_reset(struct tc358746 *tc358746) 371 { 372 int err; 373 374 err = tc358746_set_bits(tc358746, SYSCTL_REG, SRESET); 375 if (err) 376 return err; 377 378 fsleep(10); 379 380 return tc358746_clear_bits(tc358746, SYSCTL_REG, SRESET); 381 } 382 383 static int 384 tc358746_apply_pll_config(struct tc358746 *tc358746) 385 { 386 u8 post = tc358746->pll_post_div; 387 u16 pre = tc358746->pll_pre_div; 388 u16 mul = tc358746->pll_mul; 389 u32 val, mask; 390 int err; 391 392 err = tc358746_read(tc358746, PLLCTL1_REG, &val); 393 if (err) 394 return err; 395 396 /* Don't touch the PLL if running */ 397 if (FIELD_GET(PLL_EN, val) == 1) 398 return 0; 399 400 /* Pre-div and Multiplicator have a internal +1 logic */ 401 val = PLL_PRD(pre - 1) | PLL_FBD(mul - 1); 402 mask = PLL_PRD_MASK | PLL_FBD_MASK; 403 err = tc358746_update_bits(tc358746, PLLCTL0_REG, mask, val); 404 if (err) 405 return err; 406 407 val = PLL_FRS(ilog2(post)) | RESETB | PLL_EN; 408 mask = PLL_FRS_MASK | RESETB | PLL_EN; 409 tc358746_update_bits(tc358746, PLLCTL1_REG, mask, val); 410 if (err) 411 return err; 412 413 fsleep(1000); 414 415 return tc358746_set_bits(tc358746, PLLCTL1_REG, CKEN); 416 } 417 418 static int tc358746_apply_misc_config(struct tc358746 *tc358746) 419 { 420 const struct v4l2_mbus_framefmt *mbusfmt; 421 struct v4l2_subdev *sd = &tc358746->sd; 422 struct v4l2_subdev_state *sink_state; 423 const struct tc358746_format *fmt; 424 struct device *dev = sd->dev; 425 u32 val; 426 int err; 427 428 sink_state = v4l2_subdev_lock_and_get_active_state(sd); 429 430 mbusfmt = v4l2_subdev_get_pad_format(sd, sink_state, TC358746_SINK); 431 fmt = tc358746_get_format_by_code(TC358746_SINK, mbusfmt->code); 432 433 /* Self defined CSI user data type id's are not supported yet */ 434 val = PDFMT(fmt->pdformat); 435 dev_dbg(dev, "DATAFMT: 0x%x\n", val); 436 err = tc358746_write(tc358746, DATAFMT_REG, val); 437 if (err) 438 goto out; 439 440 val = PDATAF(fmt->pdataf); 441 dev_dbg(dev, "CONFCTL[PDATAF]: 0x%x\n", fmt->pdataf); 442 err = tc358746_update_bits(tc358746, CONFCTL_REG, PDATAF_MASK, val); 443 if (err) 444 goto out; 445 446 val = tc358746->vb_size / 32; 447 dev_dbg(dev, "FIFOCTL: %u (0x%x)\n", val, val); 448 err = tc358746_write(tc358746, FIFOCTL_REG, val); 449 if (err) 450 goto out; 451 452 /* Total number of bytes for each line/width */ 453 val = mbusfmt->width * fmt->bpp / 8; 454 dev_dbg(dev, "WORDCNT: %u (0x%x)\n", val, val); 455 err = tc358746_write(tc358746, WORDCNT_REG, val); 456 457 out: 458 v4l2_subdev_unlock_state(sink_state); 459 460 return err; 461 } 462 463 /* Use MHz as base so the div needs no u64 */ 464 static u32 tc358746_cfg_to_cnt(unsigned int cfg_val, 465 unsigned int clk_mhz, 466 unsigned int time_base) 467 { 468 return DIV_ROUND_UP(cfg_val * clk_mhz, time_base); 469 } 470 471 static u32 tc358746_ps_to_cnt(unsigned int cfg_val, 472 unsigned int clk_mhz) 473 { 474 return tc358746_cfg_to_cnt(cfg_val, clk_mhz, USEC_PER_SEC); 475 } 476 477 static u32 tc358746_us_to_cnt(unsigned int cfg_val, 478 unsigned int clk_mhz) 479 { 480 return tc358746_cfg_to_cnt(cfg_val, clk_mhz, 1); 481 } 482 483 static int tc358746_apply_dphy_config(struct tc358746 *tc358746) 484 { 485 struct phy_configure_opts_mipi_dphy *cfg = &tc358746->dphy_cfg; 486 bool non_cont_clk = !!(tc358746->csi_vep.bus.mipi_csi2.flags & 487 V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK); 488 struct device *dev = tc358746->sd.dev; 489 unsigned long hs_byte_clk, hf_clk; 490 u32 val, val2, lptxcnt; 491 int err; 492 493 /* The hs_byte_clk is also called SYSCLK in the excel sheet */ 494 hs_byte_clk = cfg->hs_clk_rate / 8; 495 hs_byte_clk /= HZ_PER_MHZ; 496 hf_clk = hs_byte_clk / 2; 497 498 val = tc358746_us_to_cnt(cfg->init, hf_clk) - 1; 499 dev_dbg(dev, "LINEINITCNT: %u (0x%x)\n", val, val); 500 err = tc358746_write(tc358746, LINEINITCNT_REG, val); 501 if (err) 502 return err; 503 504 val = tc358746_ps_to_cnt(cfg->lpx, hs_byte_clk) - 1; 505 lptxcnt = val; 506 dev_dbg(dev, "LPTXTIMECNT: %u (0x%x)\n", val, val); 507 err = tc358746_write(tc358746, LPTXTIMECNT_REG, val); 508 if (err) 509 return err; 510 511 val = tc358746_ps_to_cnt(cfg->clk_prepare, hs_byte_clk) - 1; 512 val2 = tc358746_ps_to_cnt(cfg->clk_zero, hs_byte_clk) - 1; 513 dev_dbg(dev, "TCLK_PREPARECNT: %u (0x%x)\n", val, val); 514 dev_dbg(dev, "TCLK_ZEROCNT: %u (0x%x)\n", val2, val2); 515 dev_dbg(dev, "TCLK_HEADERCNT: 0x%x\n", 516 (u32)(TCLK_PREPARECNT(val) | TCLK_ZEROCNT(val2))); 517 err = tc358746_write(tc358746, TCLK_HEADERCNT_REG, 518 TCLK_PREPARECNT(val) | TCLK_ZEROCNT(val2)); 519 if (err) 520 return err; 521 522 val = tc358746_ps_to_cnt(cfg->clk_trail, hs_byte_clk); 523 dev_dbg(dev, "TCLK_TRAILCNT: %u (0x%x)\n", val, val); 524 err = tc358746_write(tc358746, TCLK_TRAILCNT_REG, val); 525 if (err) 526 return err; 527 528 val = tc358746_ps_to_cnt(cfg->hs_prepare, hs_byte_clk) - 1; 529 val2 = tc358746_ps_to_cnt(cfg->hs_zero, hs_byte_clk) - 1; 530 dev_dbg(dev, "THS_PREPARECNT: %u (0x%x)\n", val, val); 531 dev_dbg(dev, "THS_ZEROCNT: %u (0x%x)\n", val2, val2); 532 dev_dbg(dev, "THS_HEADERCNT: 0x%x\n", 533 (u32)(THS_PREPARECNT(val) | THS_ZEROCNT(val2))); 534 err = tc358746_write(tc358746, THS_HEADERCNT_REG, 535 THS_PREPARECNT(val) | THS_ZEROCNT(val2)); 536 if (err) 537 return err; 538 539 /* TWAKEUP > 1ms in lptxcnt steps */ 540 val = tc358746_us_to_cnt(cfg->wakeup, hs_byte_clk); 541 val = val / (lptxcnt + 1) - 1; 542 dev_dbg(dev, "TWAKEUP: %u (0x%x)\n", val, val); 543 err = tc358746_write(tc358746, TWAKEUP_REG, val); 544 if (err) 545 return err; 546 547 val = tc358746_ps_to_cnt(cfg->clk_post, hs_byte_clk); 548 dev_dbg(dev, "TCLK_POSTCNT: %u (0x%x)\n", val, val); 549 err = tc358746_write(tc358746, TCLK_POSTCNT_REG, val); 550 if (err) 551 return err; 552 553 val = tc358746_ps_to_cnt(cfg->hs_trail, hs_byte_clk); 554 dev_dbg(dev, "THS_TRAILCNT: %u (0x%x)\n", val, val); 555 err = tc358746_write(tc358746, THS_TRAILCNT_REG, val); 556 if (err) 557 return err; 558 559 dev_dbg(dev, "CONTCLKMODE: %u", non_cont_clk ? 0 : 1); 560 561 return tc358746_write(tc358746, TXOPTIONCNTRL_REG, non_cont_clk ? 0 : 1); 562 } 563 564 #define MAX_DATA_LANES 4 565 566 static int tc358746_enable_csi_lanes(struct tc358746 *tc358746, int enable) 567 { 568 unsigned int lanes = tc358746->dphy_cfg.lanes; 569 unsigned int lane; 570 u32 reg, val; 571 int err; 572 573 err = tc358746_update_bits(tc358746, CONFCTL_REG, DATALANE_MASK, 574 lanes - 1); 575 if (err) 576 return err; 577 578 /* Clock lane */ 579 val = enable ? 0 : LANEDISABLE; 580 dev_dbg(tc358746->sd.dev, "CLW_CNTRL: 0x%x\n", val); 581 err = tc358746_write(tc358746, CLW_CNTRL_REG, val); 582 if (err) 583 return err; 584 585 for (lane = 0; lane < MAX_DATA_LANES; lane++) { 586 /* Data lanes */ 587 reg = D0W_CNTRL_REG + lane * 0x4; 588 val = (enable && lane < lanes) ? 0 : LANEDISABLE; 589 590 dev_dbg(tc358746->sd.dev, "D%uW_CNTRL: 0x%x\n", lane, val); 591 err = tc358746_write(tc358746, reg, val); 592 if (err) 593 return err; 594 } 595 596 val = 0; 597 if (enable) { 598 /* Clock lane */ 599 val |= BIT(0); 600 601 /* Data lanes */ 602 for (lane = 1; lane <= lanes; lane++) 603 val |= BIT(lane); 604 } 605 606 dev_dbg(tc358746->sd.dev, "HSTXVREGEN: 0x%x\n", val); 607 608 return tc358746_write(tc358746, HSTXVREGEN_REG, val); 609 } 610 611 static int tc358746_enable_csi_module(struct tc358746 *tc358746, int enable) 612 { 613 unsigned int lanes = tc358746->dphy_cfg.lanes; 614 int err; 615 616 /* 617 * START and STRT are only reseted/disabled by sw reset. This is 618 * required to put the lane state back into LP-11 state. The sw reset 619 * don't reset register values. 620 */ 621 if (!enable) 622 return tc358746_sw_reset(tc358746); 623 624 err = tc358746_write(tc358746, STARTCNTRL_REG, START); 625 if (err) 626 return err; 627 628 err = tc358746_write(tc358746, CSI_START_REG, STRT); 629 if (err) 630 return err; 631 632 /* CSI_CONTROL_REG is only indirect accessible */ 633 return tc358746_write(tc358746, CSI_CONFW_REG, 634 MODE(MODE_SET) | 635 ADDRESS(CSI_CONTROL_ADDRESS) | 636 DATA(CSI_MODE | TXHSMD | NOL(lanes - 1))); 637 } 638 639 static int tc358746_enable_parallel_port(struct tc358746 *tc358746, int enable) 640 { 641 int err; 642 643 if (enable) { 644 err = tc358746_write(tc358746, PP_MISC_REG, 0); 645 if (err) 646 return err; 647 648 return tc358746_set_bits(tc358746, CONFCTL_REG, PPEN); 649 } 650 651 err = tc358746_set_bits(tc358746, PP_MISC_REG, FRMSTOP); 652 if (err) 653 return err; 654 655 err = tc358746_clear_bits(tc358746, CONFCTL_REG, PPEN); 656 if (err) 657 return err; 658 659 return tc358746_set_bits(tc358746, PP_MISC_REG, RSTPTR); 660 } 661 662 static inline struct v4l2_subdev *tc358746_get_remote_sd(struct media_pad *pad) 663 { 664 pad = media_pad_remote_pad_first(pad); 665 if (!pad) 666 return NULL; 667 668 return media_entity_to_v4l2_subdev(pad->entity); 669 } 670 671 static int tc358746_s_stream(struct v4l2_subdev *sd, int enable) 672 { 673 struct tc358746 *tc358746 = to_tc358746(sd); 674 struct v4l2_subdev *src; 675 int err; 676 677 dev_dbg(sd->dev, "%sable\n", enable ? "en" : "dis"); 678 679 src = tc358746_get_remote_sd(&tc358746->pads[TC358746_SINK]); 680 if (!src) 681 return -EPIPE; 682 683 if (enable) { 684 err = pm_runtime_resume_and_get(sd->dev); 685 if (err) 686 return err; 687 688 err = tc358746_apply_dphy_config(tc358746); 689 if (err) 690 goto err_out; 691 692 err = tc358746_apply_misc_config(tc358746); 693 if (err) 694 goto err_out; 695 696 err = tc358746_enable_csi_lanes(tc358746, 1); 697 if (err) 698 goto err_out; 699 700 err = tc358746_enable_csi_module(tc358746, 1); 701 if (err) 702 goto err_out; 703 704 err = tc358746_enable_parallel_port(tc358746, 1); 705 if (err) 706 goto err_out; 707 708 err = v4l2_subdev_call(src, video, s_stream, 1); 709 if (err) 710 goto err_out; 711 712 return 0; 713 714 err_out: 715 pm_runtime_mark_last_busy(sd->dev); 716 pm_runtime_put_sync_autosuspend(sd->dev); 717 718 return err; 719 } 720 721 /* 722 * The lanes must be disabled first (before the csi module) so the 723 * LP-11 state is entered correctly. 724 */ 725 err = tc358746_enable_csi_lanes(tc358746, 0); 726 if (err) 727 return err; 728 729 err = tc358746_enable_csi_module(tc358746, 0); 730 if (err) 731 return err; 732 733 err = tc358746_enable_parallel_port(tc358746, 0); 734 if (err) 735 return err; 736 737 pm_runtime_mark_last_busy(sd->dev); 738 pm_runtime_put_sync_autosuspend(sd->dev); 739 740 return v4l2_subdev_call(src, video, s_stream, 0); 741 } 742 743 static int tc358746_init_cfg(struct v4l2_subdev *sd, 744 struct v4l2_subdev_state *state) 745 { 746 struct v4l2_mbus_framefmt *fmt; 747 748 fmt = v4l2_subdev_get_pad_format(sd, state, TC358746_SINK); 749 *fmt = tc358746_def_fmt; 750 751 fmt = v4l2_subdev_get_pad_format(sd, state, TC358746_SOURCE); 752 *fmt = tc358746_def_fmt; 753 fmt->code = tc358746_src_mbus_code(tc358746_def_fmt.code); 754 755 return 0; 756 } 757 758 static int tc358746_enum_mbus_code(struct v4l2_subdev *sd, 759 struct v4l2_subdev_state *sd_state, 760 struct v4l2_subdev_mbus_code_enum *code) 761 { 762 const struct tc358746_format *fmt; 763 764 fmt = tc358746_get_format_by_idx(code->pad, code->index); 765 if (IS_ERR(fmt)) 766 return PTR_ERR(fmt); 767 768 code->code = fmt->code; 769 770 return 0; 771 } 772 773 static int tc358746_set_fmt(struct v4l2_subdev *sd, 774 struct v4l2_subdev_state *sd_state, 775 struct v4l2_subdev_format *format) 776 { 777 struct v4l2_mbus_framefmt *src_fmt, *sink_fmt; 778 const struct tc358746_format *fmt; 779 780 /* Source follows the sink */ 781 if (format->pad == TC358746_SOURCE) 782 return v4l2_subdev_get_fmt(sd, sd_state, format); 783 784 sink_fmt = v4l2_subdev_get_pad_format(sd, sd_state, TC358746_SINK); 785 786 fmt = tc358746_get_format_by_code(format->pad, format->format.code); 787 if (IS_ERR(fmt)) 788 fmt = tc358746_get_format_by_code(format->pad, tc358746_def_fmt.code); 789 790 format->format.code = fmt->code; 791 format->format.field = V4L2_FIELD_NONE; 792 793 dev_dbg(sd->dev, "Update format: %ux%u code:0x%x -> %ux%u code:0x%x", 794 sink_fmt->width, sink_fmt->height, sink_fmt->code, 795 format->format.width, format->format.height, format->format.code); 796 797 *sink_fmt = format->format; 798 799 src_fmt = v4l2_subdev_get_pad_format(sd, sd_state, TC358746_SOURCE); 800 *src_fmt = *sink_fmt; 801 src_fmt->code = tc358746_src_mbus_code(sink_fmt->code); 802 803 return 0; 804 } 805 806 static unsigned long tc358746_find_pll_settings(struct tc358746 *tc358746, 807 unsigned long refclk, 808 unsigned long fout) 809 810 { 811 struct device *dev = tc358746->sd.dev; 812 unsigned long best_freq = 0; 813 u32 min_delta = 0xffffffff; 814 u16 prediv_max = 17; 815 u16 prediv_min = 1; 816 u16 m_best, mul; 817 u16 p_best, p; 818 u8 postdiv; 819 820 if (fout > 1000 * HZ_PER_MHZ) { 821 dev_err(dev, "HS-Clock above 1 Ghz are not supported\n"); 822 return 0; 823 } 824 825 if (fout >= 500 * HZ_PER_MHZ) 826 postdiv = 1; 827 else if (fout >= 250 * HZ_PER_MHZ) 828 postdiv = 2; 829 else if (fout >= 125 * HZ_PER_MHZ) 830 postdiv = 4; 831 else 832 postdiv = 8; 833 834 for (p = prediv_min; p <= prediv_max; p++) { 835 unsigned long delta, fin; 836 u64 tmp; 837 838 fin = DIV_ROUND_CLOSEST(refclk, p); 839 if (fin < 4 * HZ_PER_MHZ || fin > 40 * HZ_PER_MHZ) 840 continue; 841 842 tmp = fout * p * postdiv; 843 do_div(tmp, fin); 844 mul = tmp; 845 if (mul > 511) 846 continue; 847 848 tmp = mul * fin; 849 do_div(tmp, p * postdiv); 850 851 delta = abs(fout - tmp); 852 if (delta < min_delta) { 853 p_best = p; 854 m_best = mul; 855 min_delta = delta; 856 best_freq = tmp; 857 }; 858 859 if (delta == 0) 860 break; 861 }; 862 863 if (!best_freq) { 864 dev_err(dev, "Failed find PLL frequency\n"); 865 return 0; 866 } 867 868 tc358746->pll_post_div = postdiv; 869 tc358746->pll_pre_div = p_best; 870 tc358746->pll_mul = m_best; 871 872 if (best_freq != fout) 873 dev_warn(dev, "Request PLL freq:%lu, found PLL freq:%lu\n", 874 fout, best_freq); 875 876 dev_dbg(dev, "Found PLL settings: freq:%lu prediv:%u multi:%u postdiv:%u\n", 877 best_freq, p_best, m_best, postdiv); 878 879 return best_freq; 880 } 881 882 #define TC358746_PRECISION 10 883 884 static int 885 tc358746_link_validate(struct v4l2_subdev *sd, struct media_link *link, 886 struct v4l2_subdev_format *source_fmt, 887 struct v4l2_subdev_format *sink_fmt) 888 { 889 struct tc358746 *tc358746 = to_tc358746(sd); 890 unsigned long csi_bitrate, source_bitrate; 891 struct v4l2_subdev_state *sink_state; 892 struct v4l2_mbus_framefmt *mbusfmt; 893 const struct tc358746_format *fmt; 894 unsigned int fifo_sz, tmp, n; 895 struct v4l2_subdev *source; 896 s64 source_link_freq; 897 int err; 898 899 err = v4l2_subdev_link_validate_default(sd, link, source_fmt, sink_fmt); 900 if (err) 901 return err; 902 903 sink_state = v4l2_subdev_lock_and_get_active_state(sd); 904 mbusfmt = v4l2_subdev_get_pad_format(sd, sink_state, TC358746_SINK); 905 906 /* Check the FIFO settings */ 907 fmt = tc358746_get_format_by_code(TC358746_SINK, mbusfmt->code); 908 909 source = media_entity_to_v4l2_subdev(link->source->entity); 910 source_link_freq = v4l2_get_link_freq(source->ctrl_handler, 0, 0); 911 if (source_link_freq <= 0) { 912 dev_err(tc358746->sd.dev, 913 "Failed to query or invalid source link frequency\n"); 914 v4l2_subdev_unlock_state(sink_state); 915 /* Return -EINVAL in case of source_link_freq is 0 */ 916 return source_link_freq ? : -EINVAL; 917 } 918 source_bitrate = source_link_freq * fmt->bus_width; 919 920 csi_bitrate = tc358746->dphy_cfg.lanes * tc358746->pll_rate; 921 922 dev_dbg(tc358746->sd.dev, 923 "Fifo settings params: source-bitrate:%lu csi-bitrate:%lu", 924 source_bitrate, csi_bitrate); 925 926 /* Avoid possible FIFO overflows */ 927 if (csi_bitrate < source_bitrate) { 928 v4l2_subdev_unlock_state(sink_state); 929 return -EINVAL; 930 } 931 932 /* Best case */ 933 if (csi_bitrate == source_bitrate) { 934 fifo_sz = TC358746_VB_DEFAULT_SIZE; 935 tc358746->vb_size = TC358746_VB_DEFAULT_SIZE; 936 goto out; 937 } 938 939 /* 940 * Avoid possible FIFO underflow in case of 941 * csi_bitrate > source_bitrate. For such case the chip has a internal 942 * fifo which can be used to delay the line output. 943 * 944 * Fifo size calculation (excluding precision): 945 * 946 * fifo-sz, image-width - in bits 947 * sbr - source_bitrate in bits/s 948 * csir - csi_bitrate in bits/s 949 * 950 * image-width / csir >= (image-width - fifo-sz) / sbr 951 * image-width * sbr / csir >= image-width - fifo-sz 952 * fifo-sz >= image-width - image-width * sbr / csir; with n = csir/sbr 953 * fifo-sz >= image-width - image-width / n 954 */ 955 956 source_bitrate /= TC358746_PRECISION; 957 n = csi_bitrate / source_bitrate; 958 tmp = (mbusfmt->width * TC358746_PRECISION) / n; 959 fifo_sz = mbusfmt->width - tmp; 960 fifo_sz *= fmt->bpp; 961 tc358746->vb_size = round_up(fifo_sz, 32); 962 963 out: 964 dev_dbg(tc358746->sd.dev, 965 "Found FIFO size[bits]:%u -> aligned to size[bits]:%u\n", 966 fifo_sz, tc358746->vb_size); 967 968 v4l2_subdev_unlock_state(sink_state); 969 970 return tc358746->vb_size > TC358746_VB_MAX_SIZE ? -EINVAL : 0; 971 } 972 973 static int tc358746_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad, 974 struct v4l2_mbus_config *config) 975 { 976 struct tc358746 *tc358746 = to_tc358746(sd); 977 978 if (pad != TC358746_SOURCE) 979 return -EINVAL; 980 981 config->type = V4L2_MBUS_CSI2_DPHY; 982 config->bus.mipi_csi2 = tc358746->csi_vep.bus.mipi_csi2; 983 984 return 0; 985 } 986 987 static int __maybe_unused 988 tc358746_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) 989 { 990 struct tc358746 *tc358746 = to_tc358746(sd); 991 992 /* 32-bit registers starting from CLW_DPHYCONTTX */ 993 reg->size = reg->reg < CLW_DPHYCONTTX_REG ? 2 : 4; 994 995 if (!pm_runtime_get_if_in_use(sd->dev)) 996 return 0; 997 998 tc358746_read(tc358746, reg->reg, (u32 *)®->val); 999 1000 pm_runtime_mark_last_busy(sd->dev); 1001 pm_runtime_put_sync_autosuspend(sd->dev); 1002 1003 return 0; 1004 } 1005 1006 static int __maybe_unused 1007 tc358746_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg) 1008 { 1009 struct tc358746 *tc358746 = to_tc358746(sd); 1010 1011 if (!pm_runtime_get_if_in_use(sd->dev)) 1012 return 0; 1013 1014 tc358746_write(tc358746, (u32)reg->reg, (u32)reg->val); 1015 1016 pm_runtime_mark_last_busy(sd->dev); 1017 pm_runtime_put_sync_autosuspend(sd->dev); 1018 1019 return 0; 1020 } 1021 1022 static const struct v4l2_subdev_core_ops tc358746_core_ops = { 1023 #ifdef CONFIG_VIDEO_ADV_DEBUG 1024 .g_register = tc358746_g_register, 1025 .s_register = tc358746_s_register, 1026 #endif 1027 }; 1028 1029 static const struct v4l2_subdev_video_ops tc358746_video_ops = { 1030 .s_stream = tc358746_s_stream, 1031 }; 1032 1033 static const struct v4l2_subdev_pad_ops tc358746_pad_ops = { 1034 .init_cfg = tc358746_init_cfg, 1035 .enum_mbus_code = tc358746_enum_mbus_code, 1036 .set_fmt = tc358746_set_fmt, 1037 .get_fmt = v4l2_subdev_get_fmt, 1038 .link_validate = tc358746_link_validate, 1039 .get_mbus_config = tc358746_get_mbus_config, 1040 }; 1041 1042 static const struct v4l2_subdev_ops tc358746_ops = { 1043 .core = &tc358746_core_ops, 1044 .video = &tc358746_video_ops, 1045 .pad = &tc358746_pad_ops, 1046 }; 1047 1048 static const struct media_entity_operations tc358746_entity_ops = { 1049 .get_fwnode_pad = v4l2_subdev_get_fwnode_pad_1_to_1, 1050 .link_validate = v4l2_subdev_link_validate, 1051 }; 1052 1053 static int tc358746_mclk_enable(struct clk_hw *hw) 1054 { 1055 struct tc358746 *tc358746 = clk_hw_to_tc358746(hw); 1056 unsigned int div; 1057 u32 val; 1058 int err; 1059 1060 div = tc358746->mclk_postdiv / 2; 1061 val = MCLK_HIGH(div - 1) | MCLK_LOW(div - 1); 1062 dev_dbg(tc358746->sd.dev, "MCLKCTL: %u (0x%x)\n", val, val); 1063 err = tc358746_write(tc358746, MCLKCTL_REG, val); 1064 if (err) 1065 return err; 1066 1067 if (tc358746->mclk_prediv == 8) 1068 val = MCLKDIV(MCLKDIV_8); 1069 else if (tc358746->mclk_prediv == 4) 1070 val = MCLKDIV(MCLKDIV_4); 1071 else 1072 val = MCLKDIV(MCLKDIV_2); 1073 1074 dev_dbg(tc358746->sd.dev, "CLKCTL[MCLKDIV]: %u (0x%x)\n", val, val); 1075 1076 return tc358746_update_bits(tc358746, CLKCTL_REG, MCLKDIV_MASK, val); 1077 } 1078 1079 static void tc358746_mclk_disable(struct clk_hw *hw) 1080 { 1081 struct tc358746 *tc358746 = clk_hw_to_tc358746(hw); 1082 1083 tc358746_write(tc358746, MCLKCTL_REG, 0); 1084 } 1085 1086 static long 1087 tc358746_find_mclk_settings(struct tc358746 *tc358746, unsigned long mclk_rate) 1088 { 1089 unsigned long pll_rate = tc358746->pll_rate; 1090 const unsigned char prediv[] = { 2, 4, 8 }; 1091 unsigned int mclk_prediv, mclk_postdiv; 1092 struct device *dev = tc358746->sd.dev; 1093 unsigned int postdiv, mclkdiv; 1094 unsigned long best_mclk_rate; 1095 unsigned int i; 1096 1097 /* 1098 * MCLK-Div 1099 * -------------------´`--------------------- 1100 * ´ ` 1101 * +-------------+ +------------------------+ 1102 * | MCLK-PreDiv | | MCLK-PostDiv | 1103 * PLL --> | (2/4/8) | --> | (mclk_low + mclk_high) | --> MCLK 1104 * +-------------+ +------------------------+ 1105 * 1106 * The register value of mclk_low/high is mclk_low/high+1, i.e.: 1107 * mclk_low/high = 1 --> 2 MCLK-Ref Counts 1108 * mclk_low/high = 255 --> 256 MCLK-Ref Counts == max. 1109 * If mclk_low and mclk_high are 0 then MCLK is disabled. 1110 * 1111 * Keep it simple and support 50/50 duty cycles only for now, 1112 * so the calc will be: 1113 * 1114 * MCLK = PLL / (MCLK-PreDiv * 2 * MCLK-PostDiv) 1115 */ 1116 1117 if (mclk_rate == tc358746->mclk_rate) 1118 return mclk_rate; 1119 1120 /* Highest possible rate */ 1121 mclkdiv = pll_rate / mclk_rate; 1122 if (mclkdiv <= 8) { 1123 mclk_prediv = 2; 1124 mclk_postdiv = 4; 1125 best_mclk_rate = pll_rate / (2 * 4); 1126 goto out; 1127 } 1128 1129 /* First check the prediv */ 1130 for (i = 0; i < ARRAY_SIZE(prediv); i++) { 1131 postdiv = mclkdiv / prediv[i]; 1132 1133 if (postdiv % 2) 1134 continue; 1135 1136 if (postdiv >= 4 && postdiv <= 512) { 1137 mclk_prediv = prediv[i]; 1138 mclk_postdiv = postdiv; 1139 best_mclk_rate = pll_rate / (prediv[i] * postdiv); 1140 goto out; 1141 } 1142 } 1143 1144 /* No suitable prediv found, so try to adjust the postdiv */ 1145 for (postdiv = 4; postdiv <= 512; postdiv += 2) { 1146 unsigned int pre; 1147 1148 pre = mclkdiv / postdiv; 1149 if (pre == 2 || pre == 4 || pre == 8) { 1150 mclk_prediv = pre; 1151 mclk_postdiv = postdiv; 1152 best_mclk_rate = pll_rate / (pre * postdiv); 1153 goto out; 1154 } 1155 } 1156 1157 /* The MCLK <-> PLL gap is to high -> use largest possible div */ 1158 mclk_prediv = 8; 1159 mclk_postdiv = 512; 1160 best_mclk_rate = pll_rate / (8 * 512); 1161 1162 out: 1163 tc358746->mclk_prediv = mclk_prediv; 1164 tc358746->mclk_postdiv = mclk_postdiv; 1165 tc358746->mclk_rate = best_mclk_rate; 1166 1167 if (best_mclk_rate != mclk_rate) 1168 dev_warn(dev, "Request MCLK freq:%lu, found MCLK freq:%lu\n", 1169 mclk_rate, best_mclk_rate); 1170 1171 dev_dbg(dev, "Found MCLK settings: freq:%lu prediv:%u postdiv:%u\n", 1172 best_mclk_rate, mclk_prediv, mclk_postdiv); 1173 1174 return best_mclk_rate; 1175 } 1176 1177 static unsigned long 1178 tc358746_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) 1179 { 1180 struct tc358746 *tc358746 = clk_hw_to_tc358746(hw); 1181 unsigned int prediv, postdiv; 1182 u32 val; 1183 int err; 1184 1185 err = tc358746_read(tc358746, MCLKCTL_REG, &val); 1186 if (err) 1187 return 0; 1188 1189 postdiv = FIELD_GET(MCLK_LOW_MASK, val) + 1; 1190 postdiv += FIELD_GET(MCLK_HIGH_MASK, val) + 1; 1191 1192 err = tc358746_read(tc358746, CLKCTL_REG, &val); 1193 if (err) 1194 return 0; 1195 1196 prediv = FIELD_GET(MCLKDIV_MASK, val); 1197 if (prediv == MCLKDIV_8) 1198 prediv = 8; 1199 else if (prediv == MCLKDIV_4) 1200 prediv = 4; 1201 else 1202 prediv = 2; 1203 1204 return tc358746->pll_rate / (prediv * postdiv); 1205 } 1206 1207 static long tc358746_mclk_round_rate(struct clk_hw *hw, unsigned long rate, 1208 unsigned long *parent_rate) 1209 { 1210 struct tc358746 *tc358746 = clk_hw_to_tc358746(hw); 1211 1212 *parent_rate = tc358746->pll_rate; 1213 1214 return tc358746_find_mclk_settings(tc358746, rate); 1215 } 1216 1217 static int tc358746_mclk_set_rate(struct clk_hw *hw, unsigned long rate, 1218 unsigned long parent_rate) 1219 { 1220 struct tc358746 *tc358746 = clk_hw_to_tc358746(hw); 1221 1222 tc358746_find_mclk_settings(tc358746, rate); 1223 1224 return tc358746_mclk_enable(hw); 1225 } 1226 1227 static const struct clk_ops tc358746_mclk_ops = { 1228 .enable = tc358746_mclk_enable, 1229 .disable = tc358746_mclk_disable, 1230 .recalc_rate = tc358746_recalc_rate, 1231 .round_rate = tc358746_mclk_round_rate, 1232 .set_rate = tc358746_mclk_set_rate, 1233 }; 1234 1235 static int tc358746_setup_mclk_provider(struct tc358746 *tc358746) 1236 { 1237 struct clk_init_data mclk_initdata = { }; 1238 struct device *dev = tc358746->sd.dev; 1239 const char *mclk_name; 1240 int err; 1241 1242 /* MCLK clk provider support is optional */ 1243 if (!device_property_present(dev, "#clock-cells")) 1244 return 0; 1245 1246 /* Init to highest possibel MCLK */ 1247 tc358746->mclk_postdiv = 512; 1248 tc358746->mclk_prediv = 8; 1249 1250 mclk_name = "tc358746-mclk"; 1251 device_property_read_string(dev, "clock-output-names", &mclk_name); 1252 1253 mclk_initdata.name = mclk_name; 1254 mclk_initdata.ops = &tc358746_mclk_ops; 1255 tc358746->mclk_hw.init = &mclk_initdata; 1256 1257 err = devm_clk_hw_register(dev, &tc358746->mclk_hw); 1258 if (err) { 1259 dev_err(dev, "Failed to register mclk provider\n"); 1260 return err; 1261 } 1262 1263 err = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, 1264 &tc358746->mclk_hw); 1265 if (err) 1266 dev_err(dev, "Failed to add mclk provider\n"); 1267 1268 return err; 1269 } 1270 1271 static int 1272 tc358746_init_subdev(struct tc358746 *tc358746, struct i2c_client *client) 1273 { 1274 struct v4l2_subdev *sd = &tc358746->sd; 1275 int err; 1276 1277 v4l2_i2c_subdev_init(sd, client, &tc358746_ops); 1278 sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; 1279 sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; 1280 sd->entity.ops = &tc358746_entity_ops; 1281 1282 tc358746->pads[TC358746_SINK].flags = MEDIA_PAD_FL_SINK; 1283 tc358746->pads[TC358746_SOURCE].flags = MEDIA_PAD_FL_SOURCE; 1284 err = media_entity_pads_init(&sd->entity, TC358746_NR_PADS, 1285 tc358746->pads); 1286 if (err) 1287 return err; 1288 1289 err = v4l2_subdev_init_finalize(sd); 1290 if (err) 1291 media_entity_cleanup(&sd->entity); 1292 1293 return err; 1294 } 1295 1296 static int 1297 tc358746_init_output_port(struct tc358746 *tc358746, unsigned long refclk) 1298 { 1299 struct device *dev = tc358746->sd.dev; 1300 struct v4l2_fwnode_endpoint *vep; 1301 unsigned long csi_link_rate; 1302 struct fwnode_handle *ep; 1303 unsigned char csi_lanes; 1304 int err; 1305 1306 ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), TC358746_SOURCE, 1307 0, 0); 1308 if (!ep) { 1309 dev_err(dev, "Missing endpoint node\n"); 1310 return -EINVAL; 1311 } 1312 1313 /* Currently we only support 'parallel in' -> 'csi out' */ 1314 vep = &tc358746->csi_vep; 1315 vep->bus_type = V4L2_MBUS_CSI2_DPHY; 1316 err = v4l2_fwnode_endpoint_alloc_parse(ep, vep); 1317 fwnode_handle_put(ep); 1318 if (err) { 1319 dev_err(dev, "Failed to parse source endpoint\n"); 1320 return err; 1321 } 1322 1323 csi_lanes = vep->bus.mipi_csi2.num_data_lanes; 1324 if (csi_lanes == 0 || csi_lanes > 4 || 1325 vep->nr_of_link_frequencies == 0) { 1326 dev_err(dev, "error: Invalid CSI-2 settings\n"); 1327 err = -EINVAL; 1328 goto err; 1329 } 1330 1331 /* TODO: Add support to handle multiple link frequencies */ 1332 csi_link_rate = (unsigned long)vep->link_frequencies[0]; 1333 tc358746->pll_rate = tc358746_find_pll_settings(tc358746, refclk, 1334 csi_link_rate * 2); 1335 if (!tc358746->pll_rate) { 1336 err = -EINVAL; 1337 goto err; 1338 } 1339 1340 err = phy_mipi_dphy_get_default_config_for_hsclk(tc358746->pll_rate, 1341 csi_lanes, &tc358746->dphy_cfg); 1342 if (err) 1343 goto err; 1344 1345 tc358746->vb_size = TC358746_VB_DEFAULT_SIZE; 1346 1347 return 0; 1348 1349 err: 1350 v4l2_fwnode_endpoint_free(vep); 1351 1352 return err; 1353 } 1354 1355 static int tc358746_init_hw(struct tc358746 *tc358746) 1356 { 1357 struct device *dev = tc358746->sd.dev; 1358 unsigned int chipid; 1359 u32 val; 1360 int err; 1361 1362 err = pm_runtime_resume_and_get(dev); 1363 if (err < 0) { 1364 dev_err(dev, "Failed to resume the device\n"); 1365 return err; 1366 } 1367 1368 /* Ensure that CSI interface is put into LP-11 state */ 1369 err = tc358746_sw_reset(tc358746); 1370 if (err) { 1371 pm_runtime_put_sync(dev); 1372 dev_err(dev, "Failed to reset the device\n"); 1373 return err; 1374 } 1375 1376 err = tc358746_read(tc358746, CHIPID_REG, &val); 1377 pm_runtime_mark_last_busy(dev); 1378 pm_runtime_put_sync_autosuspend(dev); 1379 if (err) 1380 return -ENODEV; 1381 1382 chipid = FIELD_GET(CHIPID, val); 1383 if (chipid != 0x44) { 1384 dev_err(dev, "Invalid chipid 0x%02x\n", chipid); 1385 return -ENODEV; 1386 } 1387 1388 return 0; 1389 } 1390 1391 static int tc358746_init_controls(struct tc358746 *tc358746) 1392 { 1393 u64 *link_frequencies = tc358746->csi_vep.link_frequencies; 1394 struct v4l2_ctrl *ctrl; 1395 int err; 1396 1397 err = v4l2_ctrl_handler_init(&tc358746->ctrl_hdl, 1); 1398 if (err) 1399 return err; 1400 1401 /* 1402 * The driver currently supports only one link-frequency, regardless of 1403 * the input from the firmware, see: tc358746_init_output_port(). So 1404 * report only the first frequency from the array of possible given 1405 * frequencies. 1406 */ 1407 ctrl = v4l2_ctrl_new_int_menu(&tc358746->ctrl_hdl, NULL, 1408 V4L2_CID_LINK_FREQ, 0, 0, 1409 link_frequencies); 1410 if (ctrl) 1411 ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY; 1412 1413 err = tc358746->ctrl_hdl.error; 1414 if (err) { 1415 v4l2_ctrl_handler_free(&tc358746->ctrl_hdl); 1416 return err; 1417 } 1418 1419 tc358746->sd.ctrl_handler = &tc358746->ctrl_hdl; 1420 1421 return 0; 1422 } 1423 1424 static int tc358746_notify_bound(struct v4l2_async_notifier *notifier, 1425 struct v4l2_subdev *sd, 1426 struct v4l2_async_subdev *asd) 1427 { 1428 struct tc358746 *tc358746 = 1429 container_of(notifier, struct tc358746, notifier); 1430 u32 flags = MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE; 1431 struct media_pad *sink = &tc358746->pads[TC358746_SINK]; 1432 1433 return v4l2_create_fwnode_links_to_pad(sd, sink, flags); 1434 } 1435 1436 static const struct v4l2_async_notifier_operations tc358746_notify_ops = { 1437 .bound = tc358746_notify_bound, 1438 }; 1439 1440 static int tc358746_async_register(struct tc358746 *tc358746) 1441 { 1442 struct v4l2_fwnode_endpoint vep = { 1443 .bus_type = V4L2_MBUS_PARALLEL, 1444 }; 1445 struct v4l2_async_subdev *asd; 1446 struct fwnode_handle *ep; 1447 int err; 1448 1449 ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(tc358746->sd.dev), 1450 TC358746_SINK, 0, 0); 1451 if (!ep) 1452 return -ENOTCONN; 1453 1454 err = v4l2_fwnode_endpoint_parse(ep, &vep); 1455 if (err) { 1456 fwnode_handle_put(ep); 1457 return err; 1458 } 1459 1460 v4l2_async_nf_init(&tc358746->notifier); 1461 asd = v4l2_async_nf_add_fwnode_remote(&tc358746->notifier, ep, 1462 struct v4l2_async_subdev); 1463 fwnode_handle_put(ep); 1464 1465 if (IS_ERR(asd)) { 1466 err = PTR_ERR(asd); 1467 goto err_cleanup; 1468 } 1469 1470 tc358746->notifier.ops = &tc358746_notify_ops; 1471 1472 err = v4l2_async_subdev_nf_register(&tc358746->sd, &tc358746->notifier); 1473 if (err) 1474 goto err_cleanup; 1475 1476 tc358746->sd.fwnode = fwnode_graph_get_endpoint_by_id( 1477 dev_fwnode(tc358746->sd.dev), TC358746_SOURCE, 0, 0); 1478 1479 err = v4l2_async_register_subdev(&tc358746->sd); 1480 if (err) 1481 goto err_unregister; 1482 1483 return 0; 1484 1485 err_unregister: 1486 fwnode_handle_put(tc358746->sd.fwnode); 1487 v4l2_async_nf_unregister(&tc358746->notifier); 1488 err_cleanup: 1489 v4l2_async_nf_cleanup(&tc358746->notifier); 1490 1491 return err; 1492 } 1493 1494 static int tc358746_probe(struct i2c_client *client) 1495 { 1496 struct device *dev = &client->dev; 1497 struct tc358746 *tc358746; 1498 unsigned long refclk; 1499 unsigned int i; 1500 int err; 1501 1502 tc358746 = devm_kzalloc(&client->dev, sizeof(*tc358746), GFP_KERNEL); 1503 if (!tc358746) 1504 return -ENOMEM; 1505 1506 tc358746->regmap = devm_regmap_init_i2c(client, &tc358746_regmap_config); 1507 if (IS_ERR(tc358746->regmap)) 1508 return dev_err_probe(dev, PTR_ERR(tc358746->regmap), 1509 "Failed to init regmap\n"); 1510 1511 tc358746->refclk = devm_clk_get(dev, "refclk"); 1512 if (IS_ERR(tc358746->refclk)) 1513 return dev_err_probe(dev, PTR_ERR(tc358746->refclk), 1514 "Failed to get refclk\n"); 1515 1516 err = clk_prepare_enable(tc358746->refclk); 1517 if (err) 1518 return dev_err_probe(dev, err, 1519 "Failed to enable refclk\n"); 1520 1521 refclk = clk_get_rate(tc358746->refclk); 1522 clk_disable_unprepare(tc358746->refclk); 1523 1524 if (refclk < 6 * HZ_PER_MHZ || refclk > 40 * HZ_PER_MHZ) 1525 return dev_err_probe(dev, -EINVAL, "Invalid refclk range\n"); 1526 1527 for (i = 0; i < ARRAY_SIZE(tc358746_supplies); i++) 1528 tc358746->supplies[i].supply = tc358746_supplies[i]; 1529 1530 err = devm_regulator_bulk_get(dev, ARRAY_SIZE(tc358746_supplies), 1531 tc358746->supplies); 1532 if (err) 1533 return dev_err_probe(dev, err, "Failed to get supplies\n"); 1534 1535 tc358746->reset_gpio = devm_gpiod_get_optional(dev, "reset", 1536 GPIOD_OUT_HIGH); 1537 if (IS_ERR(tc358746->reset_gpio)) 1538 return dev_err_probe(dev, PTR_ERR(tc358746->reset_gpio), 1539 "Failed to get reset-gpios\n"); 1540 1541 err = tc358746_init_subdev(tc358746, client); 1542 if (err) 1543 return dev_err_probe(dev, err, "Failed to init subdev\n"); 1544 1545 err = tc358746_init_output_port(tc358746, refclk); 1546 if (err) 1547 goto err_subdev; 1548 1549 /* 1550 * Keep this order since we need the output port link-frequencies 1551 * information. 1552 */ 1553 err = tc358746_init_controls(tc358746); 1554 if (err) 1555 goto err_fwnode; 1556 1557 dev_set_drvdata(dev, tc358746); 1558 1559 /* Set to 1sec to give the stream reconfiguration enough time */ 1560 pm_runtime_set_autosuspend_delay(dev, 1000); 1561 pm_runtime_use_autosuspend(dev); 1562 pm_runtime_enable(dev); 1563 1564 err = tc358746_init_hw(tc358746); 1565 if (err) 1566 goto err_pm; 1567 1568 err = tc358746_setup_mclk_provider(tc358746); 1569 if (err) 1570 goto err_pm; 1571 1572 err = tc358746_async_register(tc358746); 1573 if (err < 0) 1574 goto err_pm; 1575 1576 dev_dbg(dev, "%s found @ 0x%x (%s)\n", client->name, 1577 client->addr, client->adapter->name); 1578 1579 return 0; 1580 1581 err_pm: 1582 pm_runtime_disable(dev); 1583 pm_runtime_set_suspended(dev); 1584 pm_runtime_dont_use_autosuspend(dev); 1585 v4l2_ctrl_handler_free(&tc358746->ctrl_hdl); 1586 err_fwnode: 1587 v4l2_fwnode_endpoint_free(&tc358746->csi_vep); 1588 err_subdev: 1589 v4l2_subdev_cleanup(&tc358746->sd); 1590 media_entity_cleanup(&tc358746->sd.entity); 1591 1592 return err; 1593 } 1594 1595 static void tc358746_remove(struct i2c_client *client) 1596 { 1597 struct v4l2_subdev *sd = i2c_get_clientdata(client); 1598 struct tc358746 *tc358746 = to_tc358746(sd); 1599 1600 v4l2_subdev_cleanup(sd); 1601 v4l2_ctrl_handler_free(&tc358746->ctrl_hdl); 1602 v4l2_fwnode_endpoint_free(&tc358746->csi_vep); 1603 v4l2_async_nf_unregister(&tc358746->notifier); 1604 v4l2_async_nf_cleanup(&tc358746->notifier); 1605 fwnode_handle_put(sd->fwnode); 1606 v4l2_async_unregister_subdev(sd); 1607 media_entity_cleanup(&sd->entity); 1608 1609 pm_runtime_disable(sd->dev); 1610 pm_runtime_set_suspended(sd->dev); 1611 pm_runtime_dont_use_autosuspend(sd->dev); 1612 } 1613 1614 static int tc358746_suspend(struct device *dev) 1615 { 1616 struct tc358746 *tc358746 = dev_get_drvdata(dev); 1617 int err; 1618 1619 clk_disable_unprepare(tc358746->refclk); 1620 1621 err = regulator_bulk_disable(ARRAY_SIZE(tc358746_supplies), 1622 tc358746->supplies); 1623 if (err) 1624 clk_prepare_enable(tc358746->refclk); 1625 1626 return err; 1627 } 1628 1629 static int tc358746_resume(struct device *dev) 1630 { 1631 struct tc358746 *tc358746 = dev_get_drvdata(dev); 1632 int err; 1633 1634 gpiod_set_value(tc358746->reset_gpio, 1); 1635 1636 err = regulator_bulk_enable(ARRAY_SIZE(tc358746_supplies), 1637 tc358746->supplies); 1638 if (err) 1639 return err; 1640 1641 /* min. 200ns */ 1642 usleep_range(10, 20); 1643 1644 gpiod_set_value(tc358746->reset_gpio, 0); 1645 1646 err = clk_prepare_enable(tc358746->refclk); 1647 if (err) 1648 goto err; 1649 1650 /* min. 700us ... 1ms */ 1651 usleep_range(1000, 1500); 1652 1653 /* 1654 * Enable the PLL here since it can be called by the clk-framework or by 1655 * the .s_stream() callback. So this is the common place for both. 1656 */ 1657 err = tc358746_apply_pll_config(tc358746); 1658 if (err) 1659 goto err_clk; 1660 1661 return 0; 1662 1663 err_clk: 1664 clk_disable_unprepare(tc358746->refclk); 1665 err: 1666 regulator_bulk_disable(ARRAY_SIZE(tc358746_supplies), 1667 tc358746->supplies); 1668 return err; 1669 } 1670 1671 static DEFINE_RUNTIME_DEV_PM_OPS(tc358746_pm_ops, tc358746_suspend, 1672 tc358746_resume, NULL); 1673 1674 static const struct of_device_id __maybe_unused tc358746_of_match[] = { 1675 { .compatible = "toshiba,tc358746" }, 1676 { }, 1677 }; 1678 MODULE_DEVICE_TABLE(of, tc358746_of_match); 1679 1680 static struct i2c_driver tc358746_driver = { 1681 .driver = { 1682 .name = "tc358746", 1683 .pm = pm_ptr(&tc358746_pm_ops), 1684 .of_match_table = tc358746_of_match, 1685 }, 1686 .probe_new = tc358746_probe, 1687 .remove = tc358746_remove, 1688 }; 1689 1690 module_i2c_driver(tc358746_driver); 1691 1692 MODULE_DESCRIPTION("Toshiba TC358746 Parallel to CSI-2 bridge driver"); 1693 MODULE_AUTHOR("Marco Felsch <kernel@pengutronix.de>"); 1694 MODULE_LICENSE("GPL"); 1695