1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Driver for Broadcom BRCMSTB, NSP, NS2, Cygnus SPI Controllers 4 * 5 * Copyright 2016 Broadcom 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/delay.h> 10 #include <linux/device.h> 11 #include <linux/init.h> 12 #include <linux/interrupt.h> 13 #include <linux/io.h> 14 #include <linux/ioport.h> 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/of.h> 18 #include <linux/of_irq.h> 19 #include <linux/platform_device.h> 20 #include <linux/slab.h> 21 #include <linux/spi/spi.h> 22 #include <linux/spi/spi-mem.h> 23 #include <linux/sysfs.h> 24 #include <linux/types.h> 25 #include "spi-bcm-qspi.h" 26 27 #define DRIVER_NAME "bcm_qspi" 28 29 30 /* BSPI register offsets */ 31 #define BSPI_REVISION_ID 0x000 32 #define BSPI_SCRATCH 0x004 33 #define BSPI_MAST_N_BOOT_CTRL 0x008 34 #define BSPI_BUSY_STATUS 0x00c 35 #define BSPI_INTR_STATUS 0x010 36 #define BSPI_B0_STATUS 0x014 37 #define BSPI_B0_CTRL 0x018 38 #define BSPI_B1_STATUS 0x01c 39 #define BSPI_B1_CTRL 0x020 40 #define BSPI_STRAP_OVERRIDE_CTRL 0x024 41 #define BSPI_FLEX_MODE_ENABLE 0x028 42 #define BSPI_BITS_PER_CYCLE 0x02c 43 #define BSPI_BITS_PER_PHASE 0x030 44 #define BSPI_CMD_AND_MODE_BYTE 0x034 45 #define BSPI_BSPI_FLASH_UPPER_ADDR_BYTE 0x038 46 #define BSPI_BSPI_XOR_VALUE 0x03c 47 #define BSPI_BSPI_XOR_ENABLE 0x040 48 #define BSPI_BSPI_PIO_MODE_ENABLE 0x044 49 #define BSPI_BSPI_PIO_IODIR 0x048 50 #define BSPI_BSPI_PIO_DATA 0x04c 51 52 /* RAF register offsets */ 53 #define BSPI_RAF_START_ADDR 0x100 54 #define BSPI_RAF_NUM_WORDS 0x104 55 #define BSPI_RAF_CTRL 0x108 56 #define BSPI_RAF_FULLNESS 0x10c 57 #define BSPI_RAF_WATERMARK 0x110 58 #define BSPI_RAF_STATUS 0x114 59 #define BSPI_RAF_READ_DATA 0x118 60 #define BSPI_RAF_WORD_CNT 0x11c 61 #define BSPI_RAF_CURR_ADDR 0x120 62 63 /* Override mode masks */ 64 #define BSPI_STRAP_OVERRIDE_CTRL_OVERRIDE BIT(0) 65 #define BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL BIT(1) 66 #define BSPI_STRAP_OVERRIDE_CTRL_ADDR_4BYTE BIT(2) 67 #define BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD BIT(3) 68 #define BSPI_STRAP_OVERRIDE_CTRL_ENDAIN_MODE BIT(4) 69 70 #define BSPI_ADDRLEN_3BYTES 3 71 #define BSPI_ADDRLEN_4BYTES 4 72 73 #define BSPI_RAF_STATUS_FIFO_EMPTY_MASK BIT(1) 74 75 #define BSPI_RAF_CTRL_START_MASK BIT(0) 76 #define BSPI_RAF_CTRL_CLEAR_MASK BIT(1) 77 78 #define BSPI_BPP_MODE_SELECT_MASK BIT(8) 79 #define BSPI_BPP_ADDR_SELECT_MASK BIT(16) 80 81 #define BSPI_READ_LENGTH 256 82 83 /* MSPI register offsets */ 84 #define MSPI_SPCR0_LSB 0x000 85 #define MSPI_SPCR0_MSB 0x004 86 #define MSPI_SPCR0_MSB_CPHA BIT(0) 87 #define MSPI_SPCR0_MSB_CPOL BIT(1) 88 #define MSPI_SPCR0_MSB_BITS_SHIFT 0x2 89 #define MSPI_SPCR1_LSB 0x008 90 #define MSPI_SPCR1_MSB 0x00c 91 #define MSPI_NEWQP 0x010 92 #define MSPI_ENDQP 0x014 93 #define MSPI_SPCR2 0x018 94 #define MSPI_MSPI_STATUS 0x020 95 #define MSPI_CPTQP 0x024 96 #define MSPI_SPCR3 0x028 97 #define MSPI_REV 0x02c 98 #define MSPI_TXRAM 0x040 99 #define MSPI_RXRAM 0x0c0 100 #define MSPI_CDRAM 0x140 101 #define MSPI_WRITE_LOCK 0x180 102 103 #define MSPI_MASTER_BIT BIT(7) 104 105 #define MSPI_NUM_CDRAM 16 106 #define MSPI_CDRAM_OUTP BIT(8) 107 #define MSPI_CDRAM_CONT_BIT BIT(7) 108 #define MSPI_CDRAM_BITSE_BIT BIT(6) 109 #define MSPI_CDRAM_DT_BIT BIT(5) 110 #define MSPI_CDRAM_PCS 0xf 111 112 #define MSPI_SPCR2_SPE BIT(6) 113 #define MSPI_SPCR2_CONT_AFTER_CMD BIT(7) 114 115 #define MSPI_SPCR3_FASTBR BIT(0) 116 #define MSPI_SPCR3_FASTDT BIT(1) 117 #define MSPI_SPCR3_SYSCLKSEL_MASK GENMASK(11, 10) 118 #define MSPI_SPCR3_SYSCLKSEL_27 (MSPI_SPCR3_SYSCLKSEL_MASK & \ 119 ~(BIT(10) | BIT(11))) 120 #define MSPI_SPCR3_SYSCLKSEL_108 (MSPI_SPCR3_SYSCLKSEL_MASK & \ 121 BIT(11)) 122 #define MSPI_SPCR3_TXRXDAM_MASK GENMASK(4, 2) 123 #define MSPI_SPCR3_DAM_8BYTE 0 124 #define MSPI_SPCR3_DAM_16BYTE (BIT(2) | BIT(4)) 125 #define MSPI_SPCR3_DAM_32BYTE (BIT(3) | BIT(5)) 126 #define MSPI_SPCR3_HALFDUPLEX BIT(6) 127 #define MSPI_SPCR3_HDOUTTYPE BIT(7) 128 #define MSPI_SPCR3_DATA_REG_SZ BIT(8) 129 #define MSPI_SPCR3_CPHARX BIT(9) 130 131 #define MSPI_MSPI_STATUS_SPIF BIT(0) 132 133 #define INTR_BASE_BIT_SHIFT 0x02 134 #define INTR_COUNT 0x07 135 136 #define NUM_CHIPSELECT 4 137 #define QSPI_SPBR_MAX 255U 138 #define MSPI_BASE_FREQ 27000000UL 139 140 #define OPCODE_DIOR 0xBB 141 #define OPCODE_QIOR 0xEB 142 #define OPCODE_DIOR_4B 0xBC 143 #define OPCODE_QIOR_4B 0xEC 144 145 #define MAX_CMD_SIZE 6 146 147 #define ADDR_4MB_MASK GENMASK(22, 0) 148 149 /* stop at end of transfer, no other reason */ 150 #define TRANS_STATUS_BREAK_NONE 0 151 /* stop at end of spi_message */ 152 #define TRANS_STATUS_BREAK_EOM 1 153 /* stop at end of spi_transfer if delay */ 154 #define TRANS_STATUS_BREAK_DELAY 2 155 /* stop at end of spi_transfer if cs_change */ 156 #define TRANS_STATUS_BREAK_CS_CHANGE 4 157 /* stop if we run out of bytes */ 158 #define TRANS_STATUS_BREAK_NO_BYTES 8 159 160 /* events that make us stop filling TX slots */ 161 #define TRANS_STATUS_BREAK_TX (TRANS_STATUS_BREAK_EOM | \ 162 TRANS_STATUS_BREAK_DELAY | \ 163 TRANS_STATUS_BREAK_CS_CHANGE) 164 165 /* events that make us deassert CS */ 166 #define TRANS_STATUS_BREAK_DESELECT (TRANS_STATUS_BREAK_EOM | \ 167 TRANS_STATUS_BREAK_CS_CHANGE) 168 169 /* 170 * Used for writing and reading data in the right order 171 * to TXRAM and RXRAM when used as 32-bit registers respectively 172 */ 173 #define swap4bytes(__val) \ 174 ((((__val) >> 24) & 0x000000FF) | (((__val) >> 8) & 0x0000FF00) | \ 175 (((__val) << 8) & 0x00FF0000) | (((__val) << 24) & 0xFF000000)) 176 177 struct bcm_qspi_parms { 178 u32 speed_hz; 179 u8 mode; 180 u8 bits_per_word; 181 }; 182 183 struct bcm_xfer_mode { 184 bool flex_mode; 185 unsigned int width; 186 unsigned int addrlen; 187 unsigned int hp; 188 }; 189 190 enum base_type { 191 MSPI, 192 BSPI, 193 CHIP_SELECT, 194 BASEMAX, 195 }; 196 197 enum irq_source { 198 SINGLE_L2, 199 MUXED_L1, 200 }; 201 202 struct bcm_qspi_irq { 203 const char *irq_name; 204 const irq_handler_t irq_handler; 205 int irq_source; 206 u32 mask; 207 }; 208 209 struct bcm_qspi_dev_id { 210 const struct bcm_qspi_irq *irqp; 211 void *dev; 212 }; 213 214 215 struct qspi_trans { 216 struct spi_transfer *trans; 217 int byte; 218 bool mspi_last_trans; 219 }; 220 221 struct bcm_qspi { 222 struct platform_device *pdev; 223 struct spi_master *master; 224 struct clk *clk; 225 u32 base_clk; 226 u32 max_speed_hz; 227 void __iomem *base[BASEMAX]; 228 229 /* Some SoCs provide custom interrupt status register(s) */ 230 struct bcm_qspi_soc_intc *soc_intc; 231 232 struct bcm_qspi_parms last_parms; 233 struct qspi_trans trans_pos; 234 int curr_cs; 235 int bspi_maj_rev; 236 int bspi_min_rev; 237 int bspi_enabled; 238 const struct spi_mem_op *bspi_rf_op; 239 u32 bspi_rf_op_idx; 240 u32 bspi_rf_op_len; 241 u32 bspi_rf_op_status; 242 struct bcm_xfer_mode xfer_mode; 243 u32 s3_strap_override_ctrl; 244 bool bspi_mode; 245 bool big_endian; 246 int num_irqs; 247 struct bcm_qspi_dev_id *dev_ids; 248 struct completion mspi_done; 249 struct completion bspi_done; 250 u8 mspi_maj_rev; 251 u8 mspi_min_rev; 252 bool mspi_spcr3_sysclk; 253 }; 254 255 static inline bool has_bspi(struct bcm_qspi *qspi) 256 { 257 return qspi->bspi_mode; 258 } 259 260 /* hardware supports spcr3 and fast baud-rate */ 261 static inline bool bcm_qspi_has_fastbr(struct bcm_qspi *qspi) 262 { 263 if (!has_bspi(qspi) && 264 ((qspi->mspi_maj_rev >= 1) && 265 (qspi->mspi_min_rev >= 5))) 266 return true; 267 268 return false; 269 } 270 271 /* hardware supports sys clk 108Mhz */ 272 static inline bool bcm_qspi_has_sysclk_108(struct bcm_qspi *qspi) 273 { 274 if (!has_bspi(qspi) && (qspi->mspi_spcr3_sysclk || 275 ((qspi->mspi_maj_rev >= 1) && 276 (qspi->mspi_min_rev >= 6)))) 277 return true; 278 279 return false; 280 } 281 282 static inline int bcm_qspi_spbr_min(struct bcm_qspi *qspi) 283 { 284 if (bcm_qspi_has_fastbr(qspi)) 285 return (bcm_qspi_has_sysclk_108(qspi) ? 4 : 1); 286 else 287 return 8; 288 } 289 290 static u32 bcm_qspi_calc_spbr(u32 clk_speed_hz, 291 const struct bcm_qspi_parms *xp) 292 { 293 u32 spbr = 0; 294 295 /* SPBR = System Clock/(2 * SCK Baud Rate) */ 296 if (xp->speed_hz) 297 spbr = clk_speed_hz / (xp->speed_hz * 2); 298 299 return spbr; 300 } 301 302 /* Read qspi controller register*/ 303 static inline u32 bcm_qspi_read(struct bcm_qspi *qspi, enum base_type type, 304 unsigned int offset) 305 { 306 return bcm_qspi_readl(qspi->big_endian, qspi->base[type] + offset); 307 } 308 309 /* Write qspi controller register*/ 310 static inline void bcm_qspi_write(struct bcm_qspi *qspi, enum base_type type, 311 unsigned int offset, unsigned int data) 312 { 313 bcm_qspi_writel(qspi->big_endian, data, qspi->base[type] + offset); 314 } 315 316 /* BSPI helpers */ 317 static int bcm_qspi_bspi_busy_poll(struct bcm_qspi *qspi) 318 { 319 int i; 320 321 /* this should normally finish within 10us */ 322 for (i = 0; i < 1000; i++) { 323 if (!(bcm_qspi_read(qspi, BSPI, BSPI_BUSY_STATUS) & 1)) 324 return 0; 325 udelay(1); 326 } 327 dev_warn(&qspi->pdev->dev, "timeout waiting for !busy_status\n"); 328 return -EIO; 329 } 330 331 static inline bool bcm_qspi_bspi_ver_three(struct bcm_qspi *qspi) 332 { 333 if (qspi->bspi_maj_rev < 4) 334 return true; 335 return false; 336 } 337 338 static void bcm_qspi_bspi_flush_prefetch_buffers(struct bcm_qspi *qspi) 339 { 340 bcm_qspi_bspi_busy_poll(qspi); 341 /* Force rising edge for the b0/b1 'flush' field */ 342 bcm_qspi_write(qspi, BSPI, BSPI_B0_CTRL, 1); 343 bcm_qspi_write(qspi, BSPI, BSPI_B1_CTRL, 1); 344 bcm_qspi_write(qspi, BSPI, BSPI_B0_CTRL, 0); 345 bcm_qspi_write(qspi, BSPI, BSPI_B1_CTRL, 0); 346 } 347 348 static int bcm_qspi_bspi_lr_is_fifo_empty(struct bcm_qspi *qspi) 349 { 350 return (bcm_qspi_read(qspi, BSPI, BSPI_RAF_STATUS) & 351 BSPI_RAF_STATUS_FIFO_EMPTY_MASK); 352 } 353 354 static inline u32 bcm_qspi_bspi_lr_read_fifo(struct bcm_qspi *qspi) 355 { 356 u32 data = bcm_qspi_read(qspi, BSPI, BSPI_RAF_READ_DATA); 357 358 /* BSPI v3 LR is LE only, convert data to host endianness */ 359 if (bcm_qspi_bspi_ver_three(qspi)) 360 data = le32_to_cpu(data); 361 362 return data; 363 } 364 365 static inline void bcm_qspi_bspi_lr_start(struct bcm_qspi *qspi) 366 { 367 bcm_qspi_bspi_busy_poll(qspi); 368 bcm_qspi_write(qspi, BSPI, BSPI_RAF_CTRL, 369 BSPI_RAF_CTRL_START_MASK); 370 } 371 372 static inline void bcm_qspi_bspi_lr_clear(struct bcm_qspi *qspi) 373 { 374 bcm_qspi_write(qspi, BSPI, BSPI_RAF_CTRL, 375 BSPI_RAF_CTRL_CLEAR_MASK); 376 bcm_qspi_bspi_flush_prefetch_buffers(qspi); 377 } 378 379 static void bcm_qspi_bspi_lr_data_read(struct bcm_qspi *qspi) 380 { 381 u32 *buf = (u32 *)qspi->bspi_rf_op->data.buf.in; 382 u32 data = 0; 383 384 dev_dbg(&qspi->pdev->dev, "xfer %p rx %p rxlen %d\n", qspi->bspi_rf_op, 385 qspi->bspi_rf_op->data.buf.in, qspi->bspi_rf_op_len); 386 while (!bcm_qspi_bspi_lr_is_fifo_empty(qspi)) { 387 data = bcm_qspi_bspi_lr_read_fifo(qspi); 388 if (likely(qspi->bspi_rf_op_len >= 4) && 389 IS_ALIGNED((uintptr_t)buf, 4)) { 390 buf[qspi->bspi_rf_op_idx++] = data; 391 qspi->bspi_rf_op_len -= 4; 392 } else { 393 /* Read out remaining bytes, make sure*/ 394 u8 *cbuf = (u8 *)&buf[qspi->bspi_rf_op_idx]; 395 396 data = cpu_to_le32(data); 397 while (qspi->bspi_rf_op_len) { 398 *cbuf++ = (u8)data; 399 data >>= 8; 400 qspi->bspi_rf_op_len--; 401 } 402 } 403 } 404 } 405 406 static void bcm_qspi_bspi_set_xfer_params(struct bcm_qspi *qspi, u8 cmd_byte, 407 int bpp, int bpc, int flex_mode) 408 { 409 bcm_qspi_write(qspi, BSPI, BSPI_FLEX_MODE_ENABLE, 0); 410 bcm_qspi_write(qspi, BSPI, BSPI_BITS_PER_CYCLE, bpc); 411 bcm_qspi_write(qspi, BSPI, BSPI_BITS_PER_PHASE, bpp); 412 bcm_qspi_write(qspi, BSPI, BSPI_CMD_AND_MODE_BYTE, cmd_byte); 413 bcm_qspi_write(qspi, BSPI, BSPI_FLEX_MODE_ENABLE, flex_mode); 414 } 415 416 static int bcm_qspi_bspi_set_flex_mode(struct bcm_qspi *qspi, 417 const struct spi_mem_op *op, int hp) 418 { 419 int bpc = 0, bpp = 0; 420 u8 command = op->cmd.opcode; 421 int width = op->data.buswidth ? op->data.buswidth : SPI_NBITS_SINGLE; 422 int addrlen = op->addr.nbytes; 423 int flex_mode = 1; 424 425 dev_dbg(&qspi->pdev->dev, "set flex mode w %x addrlen %x hp %d\n", 426 width, addrlen, hp); 427 428 if (addrlen == BSPI_ADDRLEN_4BYTES) 429 bpp = BSPI_BPP_ADDR_SELECT_MASK; 430 431 if (op->dummy.nbytes) 432 bpp |= (op->dummy.nbytes * 8) / op->dummy.buswidth; 433 434 switch (width) { 435 case SPI_NBITS_SINGLE: 436 if (addrlen == BSPI_ADDRLEN_3BYTES) 437 /* default mode, does not need flex_cmd */ 438 flex_mode = 0; 439 break; 440 case SPI_NBITS_DUAL: 441 bpc = 0x00000001; 442 if (hp) { 443 bpc |= 0x00010100; /* address and mode are 2-bit */ 444 bpp = BSPI_BPP_MODE_SELECT_MASK; 445 } 446 break; 447 case SPI_NBITS_QUAD: 448 bpc = 0x00000002; 449 if (hp) { 450 bpc |= 0x00020200; /* address and mode are 4-bit */ 451 bpp |= BSPI_BPP_MODE_SELECT_MASK; 452 } 453 break; 454 default: 455 return -EINVAL; 456 } 457 458 bcm_qspi_bspi_set_xfer_params(qspi, command, bpp, bpc, flex_mode); 459 460 return 0; 461 } 462 463 static int bcm_qspi_bspi_set_override(struct bcm_qspi *qspi, 464 const struct spi_mem_op *op, int hp) 465 { 466 int width = op->data.buswidth ? op->data.buswidth : SPI_NBITS_SINGLE; 467 int addrlen = op->addr.nbytes; 468 u32 data = bcm_qspi_read(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL); 469 470 dev_dbg(&qspi->pdev->dev, "set override mode w %x addrlen %x hp %d\n", 471 width, addrlen, hp); 472 473 switch (width) { 474 case SPI_NBITS_SINGLE: 475 /* clear quad/dual mode */ 476 data &= ~(BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD | 477 BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL); 478 break; 479 case SPI_NBITS_QUAD: 480 /* clear dual mode and set quad mode */ 481 data &= ~BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL; 482 data |= BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD; 483 break; 484 case SPI_NBITS_DUAL: 485 /* clear quad mode set dual mode */ 486 data &= ~BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD; 487 data |= BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL; 488 break; 489 default: 490 return -EINVAL; 491 } 492 493 if (addrlen == BSPI_ADDRLEN_4BYTES) 494 /* set 4byte mode*/ 495 data |= BSPI_STRAP_OVERRIDE_CTRL_ADDR_4BYTE; 496 else 497 /* clear 4 byte mode */ 498 data &= ~BSPI_STRAP_OVERRIDE_CTRL_ADDR_4BYTE; 499 500 /* set the override mode */ 501 data |= BSPI_STRAP_OVERRIDE_CTRL_OVERRIDE; 502 bcm_qspi_write(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL, data); 503 bcm_qspi_bspi_set_xfer_params(qspi, op->cmd.opcode, 0, 0, 0); 504 505 return 0; 506 } 507 508 static int bcm_qspi_bspi_set_mode(struct bcm_qspi *qspi, 509 const struct spi_mem_op *op, int hp) 510 { 511 int error = 0; 512 int width = op->data.buswidth ? op->data.buswidth : SPI_NBITS_SINGLE; 513 int addrlen = op->addr.nbytes; 514 515 /* default mode */ 516 qspi->xfer_mode.flex_mode = true; 517 518 if (!bcm_qspi_bspi_ver_three(qspi)) { 519 u32 val, mask; 520 521 val = bcm_qspi_read(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL); 522 mask = BSPI_STRAP_OVERRIDE_CTRL_OVERRIDE; 523 if (val & mask || qspi->s3_strap_override_ctrl & mask) { 524 qspi->xfer_mode.flex_mode = false; 525 bcm_qspi_write(qspi, BSPI, BSPI_FLEX_MODE_ENABLE, 0); 526 error = bcm_qspi_bspi_set_override(qspi, op, hp); 527 } 528 } 529 530 if (qspi->xfer_mode.flex_mode) 531 error = bcm_qspi_bspi_set_flex_mode(qspi, op, hp); 532 533 if (error) { 534 dev_warn(&qspi->pdev->dev, 535 "INVALID COMBINATION: width=%d addrlen=%d hp=%d\n", 536 width, addrlen, hp); 537 } else if (qspi->xfer_mode.width != width || 538 qspi->xfer_mode.addrlen != addrlen || 539 qspi->xfer_mode.hp != hp) { 540 qspi->xfer_mode.width = width; 541 qspi->xfer_mode.addrlen = addrlen; 542 qspi->xfer_mode.hp = hp; 543 dev_dbg(&qspi->pdev->dev, 544 "cs:%d %d-lane output, %d-byte address%s\n", 545 qspi->curr_cs, 546 qspi->xfer_mode.width, 547 qspi->xfer_mode.addrlen, 548 qspi->xfer_mode.hp != -1 ? ", hp mode" : ""); 549 } 550 551 return error; 552 } 553 554 static void bcm_qspi_enable_bspi(struct bcm_qspi *qspi) 555 { 556 if (!has_bspi(qspi)) 557 return; 558 559 qspi->bspi_enabled = 1; 560 if ((bcm_qspi_read(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL) & 1) == 0) 561 return; 562 563 bcm_qspi_bspi_flush_prefetch_buffers(qspi); 564 udelay(1); 565 bcm_qspi_write(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL, 0); 566 udelay(1); 567 } 568 569 static void bcm_qspi_disable_bspi(struct bcm_qspi *qspi) 570 { 571 if (!has_bspi(qspi)) 572 return; 573 574 qspi->bspi_enabled = 0; 575 if ((bcm_qspi_read(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL) & 1)) 576 return; 577 578 bcm_qspi_bspi_busy_poll(qspi); 579 bcm_qspi_write(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL, 1); 580 udelay(1); 581 } 582 583 static void bcm_qspi_chip_select(struct bcm_qspi *qspi, int cs) 584 { 585 u32 rd = 0; 586 u32 wr = 0; 587 588 if (cs >= 0 && qspi->base[CHIP_SELECT]) { 589 rd = bcm_qspi_read(qspi, CHIP_SELECT, 0); 590 wr = (rd & ~0xff) | (1 << cs); 591 if (rd == wr) 592 return; 593 bcm_qspi_write(qspi, CHIP_SELECT, 0, wr); 594 usleep_range(10, 20); 595 } 596 597 dev_dbg(&qspi->pdev->dev, "using cs:%d\n", cs); 598 qspi->curr_cs = cs; 599 } 600 601 static bool bcmspi_parms_did_change(const struct bcm_qspi_parms * const cur, 602 const struct bcm_qspi_parms * const prev) 603 { 604 return (cur->speed_hz != prev->speed_hz) || 605 (cur->mode != prev->mode) || 606 (cur->bits_per_word != prev->bits_per_word); 607 } 608 609 610 /* MSPI helpers */ 611 static void bcm_qspi_hw_set_parms(struct bcm_qspi *qspi, 612 const struct bcm_qspi_parms *xp) 613 { 614 u32 spcr, spbr = 0; 615 616 if (!bcmspi_parms_did_change(xp, &qspi->last_parms)) 617 return; 618 619 if (!qspi->mspi_maj_rev) 620 /* legacy controller */ 621 spcr = MSPI_MASTER_BIT; 622 else 623 spcr = 0; 624 625 /* 626 * Bits per transfer. BITS determines the number of data bits 627 * transferred if the command control bit (BITSE of a 628 * CDRAM Register) is equal to 1. 629 * If CDRAM BITSE is equal to 0, 8 data bits are transferred 630 * regardless 631 */ 632 if (xp->bits_per_word != 16 && xp->bits_per_word != 64) 633 spcr |= xp->bits_per_word << MSPI_SPCR0_MSB_BITS_SHIFT; 634 635 spcr |= xp->mode & (MSPI_SPCR0_MSB_CPHA | MSPI_SPCR0_MSB_CPOL); 636 bcm_qspi_write(qspi, MSPI, MSPI_SPCR0_MSB, spcr); 637 638 if (bcm_qspi_has_fastbr(qspi)) { 639 spcr = 0; 640 641 /* enable fastbr */ 642 spcr |= MSPI_SPCR3_FASTBR; 643 644 if (xp->mode & SPI_3WIRE) 645 spcr |= MSPI_SPCR3_HALFDUPLEX | MSPI_SPCR3_HDOUTTYPE; 646 647 if (bcm_qspi_has_sysclk_108(qspi)) { 648 /* check requested baud rate before moving to 108Mhz */ 649 spbr = bcm_qspi_calc_spbr(MSPI_BASE_FREQ * 4, xp); 650 if (spbr > QSPI_SPBR_MAX) { 651 /* use SYSCLK_27Mhz for slower baud rates */ 652 spcr &= ~MSPI_SPCR3_SYSCLKSEL_MASK; 653 qspi->base_clk = MSPI_BASE_FREQ; 654 } else { 655 /* SYSCLK_108Mhz */ 656 spcr |= MSPI_SPCR3_SYSCLKSEL_108; 657 qspi->base_clk = MSPI_BASE_FREQ * 4; 658 } 659 } 660 661 if (xp->bits_per_word > 16) { 662 /* data_reg_size 1 (64bit) */ 663 spcr |= MSPI_SPCR3_DATA_REG_SZ; 664 /* TxRx RAM data access mode 2 for 32B and set fastdt */ 665 spcr |= MSPI_SPCR3_DAM_32BYTE | MSPI_SPCR3_FASTDT; 666 /* 667 * Set length of delay after transfer 668 * DTL from 0(256) to 1 669 */ 670 bcm_qspi_write(qspi, MSPI, MSPI_SPCR1_LSB, 1); 671 } else { 672 /* data_reg_size[8] = 0 */ 673 spcr &= ~(MSPI_SPCR3_DATA_REG_SZ); 674 675 /* 676 * TxRx RAM access mode 8B 677 * and disable fastdt 678 */ 679 spcr &= ~(MSPI_SPCR3_DAM_32BYTE); 680 } 681 bcm_qspi_write(qspi, MSPI, MSPI_SPCR3, spcr); 682 } 683 684 /* SCK Baud Rate = System Clock/(2 * SPBR) */ 685 qspi->max_speed_hz = qspi->base_clk / (bcm_qspi_spbr_min(qspi) * 2); 686 spbr = bcm_qspi_calc_spbr(qspi->base_clk, xp); 687 spbr = clamp_val(spbr, bcm_qspi_spbr_min(qspi), QSPI_SPBR_MAX); 688 bcm_qspi_write(qspi, MSPI, MSPI_SPCR0_LSB, spbr); 689 690 qspi->last_parms = *xp; 691 } 692 693 static void bcm_qspi_update_parms(struct bcm_qspi *qspi, 694 struct spi_device *spi, 695 struct spi_transfer *trans) 696 { 697 struct bcm_qspi_parms xp; 698 699 xp.speed_hz = trans->speed_hz; 700 xp.bits_per_word = trans->bits_per_word; 701 xp.mode = spi->mode; 702 703 bcm_qspi_hw_set_parms(qspi, &xp); 704 } 705 706 static int bcm_qspi_setup(struct spi_device *spi) 707 { 708 struct bcm_qspi_parms *xp; 709 710 if (spi->bits_per_word > 64) 711 return -EINVAL; 712 713 xp = spi_get_ctldata(spi); 714 if (!xp) { 715 xp = kzalloc(sizeof(*xp), GFP_KERNEL); 716 if (!xp) 717 return -ENOMEM; 718 spi_set_ctldata(spi, xp); 719 } 720 xp->speed_hz = spi->max_speed_hz; 721 xp->mode = spi->mode; 722 723 if (spi->bits_per_word) 724 xp->bits_per_word = spi->bits_per_word; 725 else 726 xp->bits_per_word = 8; 727 728 return 0; 729 } 730 731 static bool bcm_qspi_mspi_transfer_is_last(struct bcm_qspi *qspi, 732 struct qspi_trans *qt) 733 { 734 if (qt->mspi_last_trans && 735 spi_transfer_is_last(qspi->master, qt->trans)) 736 return true; 737 else 738 return false; 739 } 740 741 static int update_qspi_trans_byte_count(struct bcm_qspi *qspi, 742 struct qspi_trans *qt, int flags) 743 { 744 int ret = TRANS_STATUS_BREAK_NONE; 745 746 /* count the last transferred bytes */ 747 if (qt->trans->bits_per_word <= 8) 748 qt->byte++; 749 else if (qt->trans->bits_per_word <= 16) 750 qt->byte += 2; 751 else if (qt->trans->bits_per_word <= 32) 752 qt->byte += 4; 753 else if (qt->trans->bits_per_word <= 64) 754 qt->byte += 8; 755 756 if (qt->byte >= qt->trans->len) { 757 /* we're at the end of the spi_transfer */ 758 /* in TX mode, need to pause for a delay or CS change */ 759 if (qt->trans->delay.value && 760 (flags & TRANS_STATUS_BREAK_DELAY)) 761 ret |= TRANS_STATUS_BREAK_DELAY; 762 if (qt->trans->cs_change && 763 (flags & TRANS_STATUS_BREAK_CS_CHANGE)) 764 ret |= TRANS_STATUS_BREAK_CS_CHANGE; 765 766 if (bcm_qspi_mspi_transfer_is_last(qspi, qt)) 767 ret |= TRANS_STATUS_BREAK_EOM; 768 else 769 ret |= TRANS_STATUS_BREAK_NO_BYTES; 770 771 qt->trans = NULL; 772 } 773 774 dev_dbg(&qspi->pdev->dev, "trans %p len %d byte %d ret %x\n", 775 qt->trans, qt->trans ? qt->trans->len : 0, qt->byte, ret); 776 return ret; 777 } 778 779 static inline u8 read_rxram_slot_u8(struct bcm_qspi *qspi, int slot) 780 { 781 u32 slot_offset = MSPI_RXRAM + (slot << 3) + 0x4; 782 783 /* mask out reserved bits */ 784 return bcm_qspi_read(qspi, MSPI, slot_offset) & 0xff; 785 } 786 787 static inline u16 read_rxram_slot_u16(struct bcm_qspi *qspi, int slot) 788 { 789 u32 reg_offset = MSPI_RXRAM; 790 u32 lsb_offset = reg_offset + (slot << 3) + 0x4; 791 u32 msb_offset = reg_offset + (slot << 3); 792 793 return (bcm_qspi_read(qspi, MSPI, lsb_offset) & 0xff) | 794 ((bcm_qspi_read(qspi, MSPI, msb_offset) & 0xff) << 8); 795 } 796 797 static inline u32 read_rxram_slot_u32(struct bcm_qspi *qspi, int slot) 798 { 799 u32 reg_offset = MSPI_RXRAM; 800 u32 offset = reg_offset + (slot << 3); 801 u32 val; 802 803 val = bcm_qspi_read(qspi, MSPI, offset); 804 val = swap4bytes(val); 805 806 return val; 807 } 808 809 static inline u64 read_rxram_slot_u64(struct bcm_qspi *qspi, int slot) 810 { 811 u32 reg_offset = MSPI_RXRAM; 812 u32 lsb_offset = reg_offset + (slot << 3) + 0x4; 813 u32 msb_offset = reg_offset + (slot << 3); 814 u32 msb, lsb; 815 816 msb = bcm_qspi_read(qspi, MSPI, msb_offset); 817 msb = swap4bytes(msb); 818 lsb = bcm_qspi_read(qspi, MSPI, lsb_offset); 819 lsb = swap4bytes(lsb); 820 821 return ((u64)msb << 32 | lsb); 822 } 823 824 static void read_from_hw(struct bcm_qspi *qspi, int slots) 825 { 826 struct qspi_trans tp; 827 int slot; 828 829 bcm_qspi_disable_bspi(qspi); 830 831 if (slots > MSPI_NUM_CDRAM) { 832 /* should never happen */ 833 dev_err(&qspi->pdev->dev, "%s: too many slots!\n", __func__); 834 return; 835 } 836 837 tp = qspi->trans_pos; 838 839 for (slot = 0; slot < slots; slot++) { 840 if (tp.trans->bits_per_word <= 8) { 841 u8 *buf = tp.trans->rx_buf; 842 843 if (buf) 844 buf[tp.byte] = read_rxram_slot_u8(qspi, slot); 845 dev_dbg(&qspi->pdev->dev, "RD %02x\n", 846 buf ? buf[tp.byte] : 0x0); 847 } else if (tp.trans->bits_per_word <= 16) { 848 u16 *buf = tp.trans->rx_buf; 849 850 if (buf) 851 buf[tp.byte / 2] = read_rxram_slot_u16(qspi, 852 slot); 853 dev_dbg(&qspi->pdev->dev, "RD %04x\n", 854 buf ? buf[tp.byte / 2] : 0x0); 855 } else if (tp.trans->bits_per_word <= 32) { 856 u32 *buf = tp.trans->rx_buf; 857 858 if (buf) 859 buf[tp.byte / 4] = read_rxram_slot_u32(qspi, 860 slot); 861 dev_dbg(&qspi->pdev->dev, "RD %08x\n", 862 buf ? buf[tp.byte / 4] : 0x0); 863 864 } else if (tp.trans->bits_per_word <= 64) { 865 u64 *buf = tp.trans->rx_buf; 866 867 if (buf) 868 buf[tp.byte / 8] = read_rxram_slot_u64(qspi, 869 slot); 870 dev_dbg(&qspi->pdev->dev, "RD %llx\n", 871 buf ? buf[tp.byte / 8] : 0x0); 872 873 874 } 875 876 update_qspi_trans_byte_count(qspi, &tp, 877 TRANS_STATUS_BREAK_NONE); 878 } 879 880 qspi->trans_pos = tp; 881 } 882 883 static inline void write_txram_slot_u8(struct bcm_qspi *qspi, int slot, 884 u8 val) 885 { 886 u32 reg_offset = MSPI_TXRAM + (slot << 3); 887 888 /* mask out reserved bits */ 889 bcm_qspi_write(qspi, MSPI, reg_offset, val); 890 } 891 892 static inline void write_txram_slot_u16(struct bcm_qspi *qspi, int slot, 893 u16 val) 894 { 895 u32 reg_offset = MSPI_TXRAM; 896 u32 msb_offset = reg_offset + (slot << 3); 897 u32 lsb_offset = reg_offset + (slot << 3) + 0x4; 898 899 bcm_qspi_write(qspi, MSPI, msb_offset, (val >> 8)); 900 bcm_qspi_write(qspi, MSPI, lsb_offset, (val & 0xff)); 901 } 902 903 static inline void write_txram_slot_u32(struct bcm_qspi *qspi, int slot, 904 u32 val) 905 { 906 u32 reg_offset = MSPI_TXRAM; 907 u32 msb_offset = reg_offset + (slot << 3); 908 909 bcm_qspi_write(qspi, MSPI, msb_offset, swap4bytes(val)); 910 } 911 912 static inline void write_txram_slot_u64(struct bcm_qspi *qspi, int slot, 913 u64 val) 914 { 915 u32 reg_offset = MSPI_TXRAM; 916 u32 msb_offset = reg_offset + (slot << 3); 917 u32 lsb_offset = reg_offset + (slot << 3) + 0x4; 918 u32 msb = upper_32_bits(val); 919 u32 lsb = lower_32_bits(val); 920 921 bcm_qspi_write(qspi, MSPI, msb_offset, swap4bytes(msb)); 922 bcm_qspi_write(qspi, MSPI, lsb_offset, swap4bytes(lsb)); 923 } 924 925 static inline u32 read_cdram_slot(struct bcm_qspi *qspi, int slot) 926 { 927 return bcm_qspi_read(qspi, MSPI, MSPI_CDRAM + (slot << 2)); 928 } 929 930 static inline void write_cdram_slot(struct bcm_qspi *qspi, int slot, u32 val) 931 { 932 bcm_qspi_write(qspi, MSPI, (MSPI_CDRAM + (slot << 2)), val); 933 } 934 935 /* Return number of slots written */ 936 static int write_to_hw(struct bcm_qspi *qspi, struct spi_device *spi) 937 { 938 struct qspi_trans tp; 939 int slot = 0, tstatus = 0; 940 u32 mspi_cdram = 0; 941 942 bcm_qspi_disable_bspi(qspi); 943 tp = qspi->trans_pos; 944 bcm_qspi_update_parms(qspi, spi, tp.trans); 945 946 /* Run until end of transfer or reached the max data */ 947 while (!tstatus && slot < MSPI_NUM_CDRAM) { 948 mspi_cdram = MSPI_CDRAM_CONT_BIT; 949 if (tp.trans->bits_per_word <= 8) { 950 const u8 *buf = tp.trans->tx_buf; 951 u8 val = buf ? buf[tp.byte] : 0x00; 952 953 write_txram_slot_u8(qspi, slot, val); 954 dev_dbg(&qspi->pdev->dev, "WR %02x\n", val); 955 } else if (tp.trans->bits_per_word <= 16) { 956 const u16 *buf = tp.trans->tx_buf; 957 u16 val = buf ? buf[tp.byte / 2] : 0x0000; 958 959 write_txram_slot_u16(qspi, slot, val); 960 dev_dbg(&qspi->pdev->dev, "WR %04x\n", val); 961 } else if (tp.trans->bits_per_word <= 32) { 962 const u32 *buf = tp.trans->tx_buf; 963 u32 val = buf ? buf[tp.byte/4] : 0x0; 964 965 write_txram_slot_u32(qspi, slot, val); 966 dev_dbg(&qspi->pdev->dev, "WR %08x\n", val); 967 } else if (tp.trans->bits_per_word <= 64) { 968 const u64 *buf = tp.trans->tx_buf; 969 u64 val = (buf ? buf[tp.byte/8] : 0x0); 970 971 /* use the length of delay from SPCR1_LSB */ 972 if (bcm_qspi_has_fastbr(qspi)) 973 mspi_cdram |= MSPI_CDRAM_DT_BIT; 974 975 write_txram_slot_u64(qspi, slot, val); 976 dev_dbg(&qspi->pdev->dev, "WR %llx\n", val); 977 } 978 979 mspi_cdram |= ((tp.trans->bits_per_word <= 8) ? 0 : 980 MSPI_CDRAM_BITSE_BIT); 981 982 /* set 3wrire halfduplex mode data from master to slave */ 983 if ((spi->mode & SPI_3WIRE) && tp.trans->tx_buf) 984 mspi_cdram |= MSPI_CDRAM_OUTP; 985 986 if (has_bspi(qspi)) 987 mspi_cdram &= ~1; 988 else 989 mspi_cdram |= (~(1 << spi->chip_select) & 990 MSPI_CDRAM_PCS); 991 992 write_cdram_slot(qspi, slot, mspi_cdram); 993 994 tstatus = update_qspi_trans_byte_count(qspi, &tp, 995 TRANS_STATUS_BREAK_TX); 996 slot++; 997 } 998 999 if (!slot) { 1000 dev_err(&qspi->pdev->dev, "%s: no data to send?", __func__); 1001 goto done; 1002 } 1003 1004 dev_dbg(&qspi->pdev->dev, "submitting %d slots\n", slot); 1005 bcm_qspi_write(qspi, MSPI, MSPI_NEWQP, 0); 1006 bcm_qspi_write(qspi, MSPI, MSPI_ENDQP, slot - 1); 1007 1008 /* 1009 * case 1) EOM =1, cs_change =0: SSb inactive 1010 * case 2) EOM =1, cs_change =1: SSb stay active 1011 * case 3) EOM =0, cs_change =0: SSb stay active 1012 * case 4) EOM =0, cs_change =1: SSb inactive 1013 */ 1014 if (((tstatus & TRANS_STATUS_BREAK_DESELECT) 1015 == TRANS_STATUS_BREAK_CS_CHANGE) || 1016 ((tstatus & TRANS_STATUS_BREAK_DESELECT) 1017 == TRANS_STATUS_BREAK_EOM)) { 1018 mspi_cdram = read_cdram_slot(qspi, slot - 1) & 1019 ~MSPI_CDRAM_CONT_BIT; 1020 write_cdram_slot(qspi, slot - 1, mspi_cdram); 1021 } 1022 1023 if (has_bspi(qspi)) 1024 bcm_qspi_write(qspi, MSPI, MSPI_WRITE_LOCK, 1); 1025 1026 /* Must flush previous writes before starting MSPI operation */ 1027 mb(); 1028 /* Set cont | spe | spifie */ 1029 bcm_qspi_write(qspi, MSPI, MSPI_SPCR2, 0xe0); 1030 1031 done: 1032 return slot; 1033 } 1034 1035 static int bcm_qspi_bspi_exec_mem_op(struct spi_device *spi, 1036 const struct spi_mem_op *op) 1037 { 1038 struct bcm_qspi *qspi = spi_master_get_devdata(spi->master); 1039 u32 addr = 0, len, rdlen, len_words, from = 0; 1040 int ret = 0; 1041 unsigned long timeo = msecs_to_jiffies(100); 1042 struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; 1043 1044 if (bcm_qspi_bspi_ver_three(qspi)) 1045 if (op->addr.nbytes == BSPI_ADDRLEN_4BYTES) 1046 return -EIO; 1047 1048 from = op->addr.val; 1049 if (!spi->cs_gpiod) 1050 bcm_qspi_chip_select(qspi, spi->chip_select); 1051 bcm_qspi_write(qspi, MSPI, MSPI_WRITE_LOCK, 0); 1052 1053 /* 1054 * when using flex mode we need to send 1055 * the upper address byte to bspi 1056 */ 1057 if (!bcm_qspi_bspi_ver_three(qspi)) { 1058 addr = from & 0xff000000; 1059 bcm_qspi_write(qspi, BSPI, 1060 BSPI_BSPI_FLASH_UPPER_ADDR_BYTE, addr); 1061 } 1062 1063 if (!qspi->xfer_mode.flex_mode) 1064 addr = from; 1065 else 1066 addr = from & 0x00ffffff; 1067 1068 if (bcm_qspi_bspi_ver_three(qspi) == true) 1069 addr = (addr + 0xc00000) & 0xffffff; 1070 1071 /* 1072 * read into the entire buffer by breaking the reads 1073 * into RAF buffer read lengths 1074 */ 1075 len = op->data.nbytes; 1076 qspi->bspi_rf_op_idx = 0; 1077 1078 do { 1079 if (len > BSPI_READ_LENGTH) 1080 rdlen = BSPI_READ_LENGTH; 1081 else 1082 rdlen = len; 1083 1084 reinit_completion(&qspi->bspi_done); 1085 bcm_qspi_enable_bspi(qspi); 1086 len_words = (rdlen + 3) >> 2; 1087 qspi->bspi_rf_op = op; 1088 qspi->bspi_rf_op_status = 0; 1089 qspi->bspi_rf_op_len = rdlen; 1090 dev_dbg(&qspi->pdev->dev, 1091 "bspi xfr addr 0x%x len 0x%x", addr, rdlen); 1092 bcm_qspi_write(qspi, BSPI, BSPI_RAF_START_ADDR, addr); 1093 bcm_qspi_write(qspi, BSPI, BSPI_RAF_NUM_WORDS, len_words); 1094 bcm_qspi_write(qspi, BSPI, BSPI_RAF_WATERMARK, 0); 1095 if (qspi->soc_intc) { 1096 /* 1097 * clear soc MSPI and BSPI interrupts and enable 1098 * BSPI interrupts. 1099 */ 1100 soc_intc->bcm_qspi_int_ack(soc_intc, MSPI_BSPI_DONE); 1101 soc_intc->bcm_qspi_int_set(soc_intc, BSPI_DONE, true); 1102 } 1103 1104 /* Must flush previous writes before starting BSPI operation */ 1105 mb(); 1106 bcm_qspi_bspi_lr_start(qspi); 1107 if (!wait_for_completion_timeout(&qspi->bspi_done, timeo)) { 1108 dev_err(&qspi->pdev->dev, "timeout waiting for BSPI\n"); 1109 ret = -ETIMEDOUT; 1110 break; 1111 } 1112 1113 /* set msg return length */ 1114 addr += rdlen; 1115 len -= rdlen; 1116 } while (len); 1117 1118 return ret; 1119 } 1120 1121 static int bcm_qspi_transfer_one(struct spi_master *master, 1122 struct spi_device *spi, 1123 struct spi_transfer *trans) 1124 { 1125 struct bcm_qspi *qspi = spi_master_get_devdata(master); 1126 int slots; 1127 unsigned long timeo = msecs_to_jiffies(100); 1128 1129 if (!spi->cs_gpiod) 1130 bcm_qspi_chip_select(qspi, spi->chip_select); 1131 qspi->trans_pos.trans = trans; 1132 qspi->trans_pos.byte = 0; 1133 1134 while (qspi->trans_pos.byte < trans->len) { 1135 reinit_completion(&qspi->mspi_done); 1136 1137 slots = write_to_hw(qspi, spi); 1138 if (!wait_for_completion_timeout(&qspi->mspi_done, timeo)) { 1139 dev_err(&qspi->pdev->dev, "timeout waiting for MSPI\n"); 1140 return -ETIMEDOUT; 1141 } 1142 1143 read_from_hw(qspi, slots); 1144 } 1145 bcm_qspi_enable_bspi(qspi); 1146 1147 return 0; 1148 } 1149 1150 static int bcm_qspi_mspi_exec_mem_op(struct spi_device *spi, 1151 const struct spi_mem_op *op) 1152 { 1153 struct spi_master *master = spi->master; 1154 struct bcm_qspi *qspi = spi_master_get_devdata(master); 1155 struct spi_transfer t[2]; 1156 u8 cmd[6] = { }; 1157 int ret, i; 1158 1159 memset(cmd, 0, sizeof(cmd)); 1160 memset(t, 0, sizeof(t)); 1161 1162 /* tx */ 1163 /* opcode is in cmd[0] */ 1164 cmd[0] = op->cmd.opcode; 1165 for (i = 0; i < op->addr.nbytes; i++) 1166 cmd[1 + i] = op->addr.val >> (8 * (op->addr.nbytes - i - 1)); 1167 1168 t[0].tx_buf = cmd; 1169 t[0].len = op->addr.nbytes + op->dummy.nbytes + 1; 1170 t[0].bits_per_word = spi->bits_per_word; 1171 t[0].tx_nbits = op->cmd.buswidth; 1172 /* lets mspi know that this is not last transfer */ 1173 qspi->trans_pos.mspi_last_trans = false; 1174 ret = bcm_qspi_transfer_one(master, spi, &t[0]); 1175 1176 /* rx */ 1177 qspi->trans_pos.mspi_last_trans = true; 1178 if (!ret) { 1179 /* rx */ 1180 t[1].rx_buf = op->data.buf.in; 1181 t[1].len = op->data.nbytes; 1182 t[1].rx_nbits = op->data.buswidth; 1183 t[1].bits_per_word = spi->bits_per_word; 1184 ret = bcm_qspi_transfer_one(master, spi, &t[1]); 1185 } 1186 1187 return ret; 1188 } 1189 1190 static int bcm_qspi_exec_mem_op(struct spi_mem *mem, 1191 const struct spi_mem_op *op) 1192 { 1193 struct spi_device *spi = mem->spi; 1194 struct bcm_qspi *qspi = spi_master_get_devdata(spi->master); 1195 int ret = 0; 1196 bool mspi_read = false; 1197 u32 addr = 0, len; 1198 u_char *buf; 1199 1200 if (!op->data.nbytes || !op->addr.nbytes || op->addr.nbytes > 4 || 1201 op->data.dir != SPI_MEM_DATA_IN) 1202 return -ENOTSUPP; 1203 1204 buf = op->data.buf.in; 1205 addr = op->addr.val; 1206 len = op->data.nbytes; 1207 1208 if (has_bspi(qspi) && bcm_qspi_bspi_ver_three(qspi) == true) { 1209 /* 1210 * The address coming into this function is a raw flash offset. 1211 * But for BSPI <= V3, we need to convert it to a remapped BSPI 1212 * address. If it crosses a 4MB boundary, just revert back to 1213 * using MSPI. 1214 */ 1215 addr = (addr + 0xc00000) & 0xffffff; 1216 1217 if ((~ADDR_4MB_MASK & addr) ^ 1218 (~ADDR_4MB_MASK & (addr + len - 1))) 1219 mspi_read = true; 1220 } 1221 1222 /* non-aligned and very short transfers are handled by MSPI */ 1223 if (!IS_ALIGNED((uintptr_t)addr, 4) || !IS_ALIGNED((uintptr_t)buf, 4) || 1224 len < 4) 1225 mspi_read = true; 1226 1227 if (!has_bspi(qspi) || mspi_read) 1228 return bcm_qspi_mspi_exec_mem_op(spi, op); 1229 1230 ret = bcm_qspi_bspi_set_mode(qspi, op, 0); 1231 1232 if (!ret) 1233 ret = bcm_qspi_bspi_exec_mem_op(spi, op); 1234 1235 return ret; 1236 } 1237 1238 static void bcm_qspi_cleanup(struct spi_device *spi) 1239 { 1240 struct bcm_qspi_parms *xp = spi_get_ctldata(spi); 1241 1242 kfree(xp); 1243 } 1244 1245 static irqreturn_t bcm_qspi_mspi_l2_isr(int irq, void *dev_id) 1246 { 1247 struct bcm_qspi_dev_id *qspi_dev_id = dev_id; 1248 struct bcm_qspi *qspi = qspi_dev_id->dev; 1249 u32 status = bcm_qspi_read(qspi, MSPI, MSPI_MSPI_STATUS); 1250 1251 if (status & MSPI_MSPI_STATUS_SPIF) { 1252 struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; 1253 /* clear interrupt */ 1254 status &= ~MSPI_MSPI_STATUS_SPIF; 1255 bcm_qspi_write(qspi, MSPI, MSPI_MSPI_STATUS, status); 1256 if (qspi->soc_intc) 1257 soc_intc->bcm_qspi_int_ack(soc_intc, MSPI_DONE); 1258 complete(&qspi->mspi_done); 1259 return IRQ_HANDLED; 1260 } 1261 1262 return IRQ_NONE; 1263 } 1264 1265 static irqreturn_t bcm_qspi_bspi_lr_l2_isr(int irq, void *dev_id) 1266 { 1267 struct bcm_qspi_dev_id *qspi_dev_id = dev_id; 1268 struct bcm_qspi *qspi = qspi_dev_id->dev; 1269 struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; 1270 u32 status = qspi_dev_id->irqp->mask; 1271 1272 if (qspi->bspi_enabled && qspi->bspi_rf_op) { 1273 bcm_qspi_bspi_lr_data_read(qspi); 1274 if (qspi->bspi_rf_op_len == 0) { 1275 qspi->bspi_rf_op = NULL; 1276 if (qspi->soc_intc) { 1277 /* disable soc BSPI interrupt */ 1278 soc_intc->bcm_qspi_int_set(soc_intc, BSPI_DONE, 1279 false); 1280 /* indicate done */ 1281 status = INTR_BSPI_LR_SESSION_DONE_MASK; 1282 } 1283 1284 if (qspi->bspi_rf_op_status) 1285 bcm_qspi_bspi_lr_clear(qspi); 1286 else 1287 bcm_qspi_bspi_flush_prefetch_buffers(qspi); 1288 } 1289 1290 if (qspi->soc_intc) 1291 /* clear soc BSPI interrupt */ 1292 soc_intc->bcm_qspi_int_ack(soc_intc, BSPI_DONE); 1293 } 1294 1295 status &= INTR_BSPI_LR_SESSION_DONE_MASK; 1296 if (qspi->bspi_enabled && status && qspi->bspi_rf_op_len == 0) 1297 complete(&qspi->bspi_done); 1298 1299 return IRQ_HANDLED; 1300 } 1301 1302 static irqreturn_t bcm_qspi_bspi_lr_err_l2_isr(int irq, void *dev_id) 1303 { 1304 struct bcm_qspi_dev_id *qspi_dev_id = dev_id; 1305 struct bcm_qspi *qspi = qspi_dev_id->dev; 1306 struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; 1307 1308 dev_err(&qspi->pdev->dev, "BSPI INT error\n"); 1309 qspi->bspi_rf_op_status = -EIO; 1310 if (qspi->soc_intc) 1311 /* clear soc interrupt */ 1312 soc_intc->bcm_qspi_int_ack(soc_intc, BSPI_ERR); 1313 1314 complete(&qspi->bspi_done); 1315 return IRQ_HANDLED; 1316 } 1317 1318 static irqreturn_t bcm_qspi_l1_isr(int irq, void *dev_id) 1319 { 1320 struct bcm_qspi_dev_id *qspi_dev_id = dev_id; 1321 struct bcm_qspi *qspi = qspi_dev_id->dev; 1322 struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; 1323 irqreturn_t ret = IRQ_NONE; 1324 1325 if (soc_intc) { 1326 u32 status = soc_intc->bcm_qspi_get_int_status(soc_intc); 1327 1328 if (status & MSPI_DONE) 1329 ret = bcm_qspi_mspi_l2_isr(irq, dev_id); 1330 else if (status & BSPI_DONE) 1331 ret = bcm_qspi_bspi_lr_l2_isr(irq, dev_id); 1332 else if (status & BSPI_ERR) 1333 ret = bcm_qspi_bspi_lr_err_l2_isr(irq, dev_id); 1334 } 1335 1336 return ret; 1337 } 1338 1339 static const struct bcm_qspi_irq qspi_irq_tab[] = { 1340 { 1341 .irq_name = "spi_lr_fullness_reached", 1342 .irq_handler = bcm_qspi_bspi_lr_l2_isr, 1343 .mask = INTR_BSPI_LR_FULLNESS_REACHED_MASK, 1344 }, 1345 { 1346 .irq_name = "spi_lr_session_aborted", 1347 .irq_handler = bcm_qspi_bspi_lr_err_l2_isr, 1348 .mask = INTR_BSPI_LR_SESSION_ABORTED_MASK, 1349 }, 1350 { 1351 .irq_name = "spi_lr_impatient", 1352 .irq_handler = bcm_qspi_bspi_lr_err_l2_isr, 1353 .mask = INTR_BSPI_LR_IMPATIENT_MASK, 1354 }, 1355 { 1356 .irq_name = "spi_lr_session_done", 1357 .irq_handler = bcm_qspi_bspi_lr_l2_isr, 1358 .mask = INTR_BSPI_LR_SESSION_DONE_MASK, 1359 }, 1360 #ifdef QSPI_INT_DEBUG 1361 /* this interrupt is for debug purposes only, dont request irq */ 1362 { 1363 .irq_name = "spi_lr_overread", 1364 .irq_handler = bcm_qspi_bspi_lr_err_l2_isr, 1365 .mask = INTR_BSPI_LR_OVERREAD_MASK, 1366 }, 1367 #endif 1368 { 1369 .irq_name = "mspi_done", 1370 .irq_handler = bcm_qspi_mspi_l2_isr, 1371 .mask = INTR_MSPI_DONE_MASK, 1372 }, 1373 { 1374 .irq_name = "mspi_halted", 1375 .irq_handler = bcm_qspi_mspi_l2_isr, 1376 .mask = INTR_MSPI_HALTED_MASK, 1377 }, 1378 { 1379 /* single muxed L1 interrupt source */ 1380 .irq_name = "spi_l1_intr", 1381 .irq_handler = bcm_qspi_l1_isr, 1382 .irq_source = MUXED_L1, 1383 .mask = QSPI_INTERRUPTS_ALL, 1384 }, 1385 }; 1386 1387 static void bcm_qspi_bspi_init(struct bcm_qspi *qspi) 1388 { 1389 u32 val = 0; 1390 1391 val = bcm_qspi_read(qspi, BSPI, BSPI_REVISION_ID); 1392 qspi->bspi_maj_rev = (val >> 8) & 0xff; 1393 qspi->bspi_min_rev = val & 0xff; 1394 if (!(bcm_qspi_bspi_ver_three(qspi))) { 1395 /* Force mapping of BSPI address -> flash offset */ 1396 bcm_qspi_write(qspi, BSPI, BSPI_BSPI_XOR_VALUE, 0); 1397 bcm_qspi_write(qspi, BSPI, BSPI_BSPI_XOR_ENABLE, 1); 1398 } 1399 qspi->bspi_enabled = 1; 1400 bcm_qspi_disable_bspi(qspi); 1401 bcm_qspi_write(qspi, BSPI, BSPI_B0_CTRL, 0); 1402 bcm_qspi_write(qspi, BSPI, BSPI_B1_CTRL, 0); 1403 } 1404 1405 static void bcm_qspi_hw_init(struct bcm_qspi *qspi) 1406 { 1407 struct bcm_qspi_parms parms; 1408 1409 bcm_qspi_write(qspi, MSPI, MSPI_SPCR1_LSB, 0); 1410 bcm_qspi_write(qspi, MSPI, MSPI_SPCR1_MSB, 0); 1411 bcm_qspi_write(qspi, MSPI, MSPI_NEWQP, 0); 1412 bcm_qspi_write(qspi, MSPI, MSPI_ENDQP, 0); 1413 bcm_qspi_write(qspi, MSPI, MSPI_SPCR2, 0x20); 1414 1415 parms.mode = SPI_MODE_3; 1416 parms.bits_per_word = 8; 1417 parms.speed_hz = qspi->max_speed_hz; 1418 bcm_qspi_hw_set_parms(qspi, &parms); 1419 1420 if (has_bspi(qspi)) 1421 bcm_qspi_bspi_init(qspi); 1422 } 1423 1424 static void bcm_qspi_hw_uninit(struct bcm_qspi *qspi) 1425 { 1426 u32 status = bcm_qspi_read(qspi, MSPI, MSPI_MSPI_STATUS); 1427 1428 bcm_qspi_write(qspi, MSPI, MSPI_SPCR2, 0); 1429 if (has_bspi(qspi)) 1430 bcm_qspi_write(qspi, MSPI, MSPI_WRITE_LOCK, 0); 1431 1432 /* clear interrupt */ 1433 bcm_qspi_write(qspi, MSPI, MSPI_MSPI_STATUS, status & ~1); 1434 } 1435 1436 static const struct spi_controller_mem_ops bcm_qspi_mem_ops = { 1437 .exec_op = bcm_qspi_exec_mem_op, 1438 }; 1439 1440 struct bcm_qspi_data { 1441 bool has_mspi_rev; 1442 bool has_spcr3_sysclk; 1443 }; 1444 1445 static const struct bcm_qspi_data bcm_qspi_no_rev_data = { 1446 .has_mspi_rev = false, 1447 .has_spcr3_sysclk = false, 1448 }; 1449 1450 static const struct bcm_qspi_data bcm_qspi_rev_data = { 1451 .has_mspi_rev = true, 1452 .has_spcr3_sysclk = false, 1453 }; 1454 1455 static const struct bcm_qspi_data bcm_qspi_spcr3_data = { 1456 .has_mspi_rev = true, 1457 .has_spcr3_sysclk = true, 1458 }; 1459 1460 static const struct of_device_id bcm_qspi_of_match[] = { 1461 { 1462 .compatible = "brcm,spi-bcm7445-qspi", 1463 .data = &bcm_qspi_rev_data, 1464 1465 }, 1466 { 1467 .compatible = "brcm,spi-bcm-qspi", 1468 .data = &bcm_qspi_no_rev_data, 1469 }, 1470 { 1471 .compatible = "brcm,spi-bcm7216-qspi", 1472 .data = &bcm_qspi_spcr3_data, 1473 }, 1474 { 1475 .compatible = "brcm,spi-bcm7278-qspi", 1476 .data = &bcm_qspi_spcr3_data, 1477 }, 1478 {}, 1479 }; 1480 MODULE_DEVICE_TABLE(of, bcm_qspi_of_match); 1481 1482 int bcm_qspi_probe(struct platform_device *pdev, 1483 struct bcm_qspi_soc_intc *soc_intc) 1484 { 1485 const struct of_device_id *of_id = NULL; 1486 const struct bcm_qspi_data *data; 1487 struct device *dev = &pdev->dev; 1488 struct bcm_qspi *qspi; 1489 struct spi_master *master; 1490 struct resource *res; 1491 int irq, ret = 0, num_ints = 0; 1492 u32 val; 1493 u32 rev = 0; 1494 const char *name = NULL; 1495 int num_irqs = ARRAY_SIZE(qspi_irq_tab); 1496 1497 /* We only support device-tree instantiation */ 1498 if (!dev->of_node) 1499 return -ENODEV; 1500 1501 of_id = of_match_node(bcm_qspi_of_match, dev->of_node); 1502 if (!of_id) 1503 return -ENODEV; 1504 1505 data = of_id->data; 1506 1507 master = devm_spi_alloc_master(dev, sizeof(struct bcm_qspi)); 1508 if (!master) { 1509 dev_err(dev, "error allocating spi_master\n"); 1510 return -ENOMEM; 1511 } 1512 1513 qspi = spi_master_get_devdata(master); 1514 1515 qspi->clk = devm_clk_get_optional(&pdev->dev, NULL); 1516 if (IS_ERR(qspi->clk)) 1517 return PTR_ERR(qspi->clk); 1518 1519 qspi->pdev = pdev; 1520 qspi->trans_pos.trans = NULL; 1521 qspi->trans_pos.byte = 0; 1522 qspi->trans_pos.mspi_last_trans = true; 1523 qspi->master = master; 1524 1525 master->bus_num = -1; 1526 master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_RX_DUAL | SPI_RX_QUAD | 1527 SPI_3WIRE; 1528 master->setup = bcm_qspi_setup; 1529 master->transfer_one = bcm_qspi_transfer_one; 1530 master->mem_ops = &bcm_qspi_mem_ops; 1531 master->cleanup = bcm_qspi_cleanup; 1532 master->dev.of_node = dev->of_node; 1533 master->num_chipselect = NUM_CHIPSELECT; 1534 master->use_gpio_descriptors = true; 1535 1536 qspi->big_endian = of_device_is_big_endian(dev->of_node); 1537 1538 if (!of_property_read_u32(dev->of_node, "num-cs", &val)) 1539 master->num_chipselect = val; 1540 1541 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hif_mspi"); 1542 if (!res) 1543 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, 1544 "mspi"); 1545 1546 if (res) { 1547 qspi->base[MSPI] = devm_ioremap_resource(dev, res); 1548 if (IS_ERR(qspi->base[MSPI])) 1549 return PTR_ERR(qspi->base[MSPI]); 1550 } else { 1551 return 0; 1552 } 1553 1554 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "bspi"); 1555 if (res) { 1556 qspi->base[BSPI] = devm_ioremap_resource(dev, res); 1557 if (IS_ERR(qspi->base[BSPI])) 1558 return PTR_ERR(qspi->base[BSPI]); 1559 qspi->bspi_mode = true; 1560 } else { 1561 qspi->bspi_mode = false; 1562 } 1563 1564 dev_info(dev, "using %smspi mode\n", qspi->bspi_mode ? "bspi-" : ""); 1565 1566 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs_reg"); 1567 if (res) { 1568 qspi->base[CHIP_SELECT] = devm_ioremap_resource(dev, res); 1569 if (IS_ERR(qspi->base[CHIP_SELECT])) 1570 return PTR_ERR(qspi->base[CHIP_SELECT]); 1571 } 1572 1573 qspi->dev_ids = kcalloc(num_irqs, sizeof(struct bcm_qspi_dev_id), 1574 GFP_KERNEL); 1575 if (!qspi->dev_ids) 1576 return -ENOMEM; 1577 1578 /* 1579 * Some SoCs integrate spi controller (e.g., its interrupt bits) 1580 * in specific ways 1581 */ 1582 if (soc_intc) { 1583 qspi->soc_intc = soc_intc; 1584 soc_intc->bcm_qspi_int_set(soc_intc, MSPI_DONE, true); 1585 } else { 1586 qspi->soc_intc = NULL; 1587 } 1588 1589 if (qspi->clk) { 1590 ret = clk_prepare_enable(qspi->clk); 1591 if (ret) { 1592 dev_err(dev, "failed to prepare clock\n"); 1593 goto qspi_probe_err; 1594 } 1595 qspi->base_clk = clk_get_rate(qspi->clk); 1596 } else { 1597 qspi->base_clk = MSPI_BASE_FREQ; 1598 } 1599 1600 if (data->has_mspi_rev) { 1601 rev = bcm_qspi_read(qspi, MSPI, MSPI_REV); 1602 /* some older revs do not have a MSPI_REV register */ 1603 if ((rev & 0xff) == 0xff) 1604 rev = 0; 1605 } 1606 1607 qspi->mspi_maj_rev = (rev >> 4) & 0xf; 1608 qspi->mspi_min_rev = rev & 0xf; 1609 qspi->mspi_spcr3_sysclk = data->has_spcr3_sysclk; 1610 1611 qspi->max_speed_hz = qspi->base_clk / (bcm_qspi_spbr_min(qspi) * 2); 1612 1613 /* 1614 * On SW resets it is possible to have the mask still enabled 1615 * Need to disable the mask and clear the status while we init 1616 */ 1617 bcm_qspi_hw_uninit(qspi); 1618 1619 for (val = 0; val < num_irqs; val++) { 1620 irq = -1; 1621 name = qspi_irq_tab[val].irq_name; 1622 if (qspi_irq_tab[val].irq_source == SINGLE_L2) { 1623 /* get the l2 interrupts */ 1624 irq = platform_get_irq_byname_optional(pdev, name); 1625 } else if (!num_ints && soc_intc) { 1626 /* all mspi, bspi intrs muxed to one L1 intr */ 1627 irq = platform_get_irq(pdev, 0); 1628 } 1629 1630 if (irq >= 0) { 1631 ret = devm_request_irq(&pdev->dev, irq, 1632 qspi_irq_tab[val].irq_handler, 0, 1633 name, 1634 &qspi->dev_ids[val]); 1635 if (ret < 0) { 1636 dev_err(&pdev->dev, "IRQ %s not found\n", name); 1637 goto qspi_unprepare_err; 1638 } 1639 1640 qspi->dev_ids[val].dev = qspi; 1641 qspi->dev_ids[val].irqp = &qspi_irq_tab[val]; 1642 num_ints++; 1643 dev_dbg(&pdev->dev, "registered IRQ %s %d\n", 1644 qspi_irq_tab[val].irq_name, 1645 irq); 1646 } 1647 } 1648 1649 if (!num_ints) { 1650 dev_err(&pdev->dev, "no IRQs registered, cannot init driver\n"); 1651 ret = -EINVAL; 1652 goto qspi_unprepare_err; 1653 } 1654 1655 bcm_qspi_hw_init(qspi); 1656 init_completion(&qspi->mspi_done); 1657 init_completion(&qspi->bspi_done); 1658 qspi->curr_cs = -1; 1659 1660 platform_set_drvdata(pdev, qspi); 1661 1662 qspi->xfer_mode.width = -1; 1663 qspi->xfer_mode.addrlen = -1; 1664 qspi->xfer_mode.hp = -1; 1665 1666 ret = spi_register_master(master); 1667 if (ret < 0) { 1668 dev_err(dev, "can't register master\n"); 1669 goto qspi_reg_err; 1670 } 1671 1672 return 0; 1673 1674 qspi_reg_err: 1675 bcm_qspi_hw_uninit(qspi); 1676 qspi_unprepare_err: 1677 clk_disable_unprepare(qspi->clk); 1678 qspi_probe_err: 1679 kfree(qspi->dev_ids); 1680 return ret; 1681 } 1682 /* probe function to be called by SoC specific platform driver probe */ 1683 EXPORT_SYMBOL_GPL(bcm_qspi_probe); 1684 1685 int bcm_qspi_remove(struct platform_device *pdev) 1686 { 1687 struct bcm_qspi *qspi = platform_get_drvdata(pdev); 1688 1689 spi_unregister_master(qspi->master); 1690 bcm_qspi_hw_uninit(qspi); 1691 clk_disable_unprepare(qspi->clk); 1692 kfree(qspi->dev_ids); 1693 1694 return 0; 1695 } 1696 /* function to be called by SoC specific platform driver remove() */ 1697 EXPORT_SYMBOL_GPL(bcm_qspi_remove); 1698 1699 static int __maybe_unused bcm_qspi_suspend(struct device *dev) 1700 { 1701 struct bcm_qspi *qspi = dev_get_drvdata(dev); 1702 1703 /* store the override strap value */ 1704 if (!bcm_qspi_bspi_ver_three(qspi)) 1705 qspi->s3_strap_override_ctrl = 1706 bcm_qspi_read(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL); 1707 1708 spi_master_suspend(qspi->master); 1709 clk_disable_unprepare(qspi->clk); 1710 bcm_qspi_hw_uninit(qspi); 1711 1712 return 0; 1713 }; 1714 1715 static int __maybe_unused bcm_qspi_resume(struct device *dev) 1716 { 1717 struct bcm_qspi *qspi = dev_get_drvdata(dev); 1718 int ret = 0; 1719 1720 bcm_qspi_hw_init(qspi); 1721 bcm_qspi_chip_select(qspi, qspi->curr_cs); 1722 if (qspi->soc_intc) 1723 /* enable MSPI interrupt */ 1724 qspi->soc_intc->bcm_qspi_int_set(qspi->soc_intc, MSPI_DONE, 1725 true); 1726 1727 ret = clk_prepare_enable(qspi->clk); 1728 if (!ret) 1729 spi_master_resume(qspi->master); 1730 1731 return ret; 1732 } 1733 1734 SIMPLE_DEV_PM_OPS(bcm_qspi_pm_ops, bcm_qspi_suspend, bcm_qspi_resume); 1735 1736 /* pm_ops to be called by SoC specific platform driver */ 1737 EXPORT_SYMBOL_GPL(bcm_qspi_pm_ops); 1738 1739 MODULE_AUTHOR("Kamal Dasu"); 1740 MODULE_DESCRIPTION("Broadcom QSPI driver"); 1741 MODULE_LICENSE("GPL v2"); 1742 MODULE_ALIAS("platform:" DRIVER_NAME); 1743