1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Rockchip Serial Flash Controller Driver 4 * 5 * Copyright (c) 2017-2021, Rockchip Inc. 6 * Author: Shawn Lin <shawn.lin@rock-chips.com> 7 * Chris Morgan <macroalpha82@gmail.com> 8 * Jon Lin <Jon.lin@rock-chips.com> 9 */ 10 11#include <linux/bitops.h> 12#include <linux/clk.h> 13#include <linux/completion.h> 14#include <linux/dma-mapping.h> 15#include <linux/iopoll.h> 16#include <linux/mm.h> 17#include <linux/module.h> 18#include <linux/of.h> 19#include <linux/platform_device.h> 20#include <linux/slab.h> 21#include <linux/interrupt.h> 22#include <linux/spi/spi-mem.h> 23 24/* System control */ 25#define SFC_CTRL 0x0 26#define SFC_CTRL_PHASE_SEL_NEGETIVE BIT(1) 27#define SFC_CTRL_CMD_BITS_SHIFT 8 28#define SFC_CTRL_ADDR_BITS_SHIFT 10 29#define SFC_CTRL_DATA_BITS_SHIFT 12 30 31/* Interrupt mask */ 32#define SFC_IMR 0x4 33#define SFC_IMR_RX_FULL BIT(0) 34#define SFC_IMR_RX_UFLOW BIT(1) 35#define SFC_IMR_TX_OFLOW BIT(2) 36#define SFC_IMR_TX_EMPTY BIT(3) 37#define SFC_IMR_TRAN_FINISH BIT(4) 38#define SFC_IMR_BUS_ERR BIT(5) 39#define SFC_IMR_NSPI_ERR BIT(6) 40#define SFC_IMR_DMA BIT(7) 41 42/* Interrupt clear */ 43#define SFC_ICLR 0x8 44#define SFC_ICLR_RX_FULL BIT(0) 45#define SFC_ICLR_RX_UFLOW BIT(1) 46#define SFC_ICLR_TX_OFLOW BIT(2) 47#define SFC_ICLR_TX_EMPTY BIT(3) 48#define SFC_ICLR_TRAN_FINISH BIT(4) 49#define SFC_ICLR_BUS_ERR BIT(5) 50#define SFC_ICLR_NSPI_ERR BIT(6) 51#define SFC_ICLR_DMA BIT(7) 52 53/* FIFO threshold level */ 54#define SFC_FTLR 0xc 55#define SFC_FTLR_TX_SHIFT 0 56#define SFC_FTLR_TX_MASK 0x1f 57#define SFC_FTLR_RX_SHIFT 8 58#define SFC_FTLR_RX_MASK 0x1f 59 60/* Reset FSM and FIFO */ 61#define SFC_RCVR 0x10 62#define SFC_RCVR_RESET BIT(0) 63 64/* Enhanced mode */ 65#define SFC_AX 0x14 66 67/* Address Bit number */ 68#define SFC_ABIT 0x18 69 70/* Interrupt status */ 71#define SFC_ISR 0x1c 72#define SFC_ISR_RX_FULL_SHIFT BIT(0) 73#define SFC_ISR_RX_UFLOW_SHIFT BIT(1) 74#define SFC_ISR_TX_OFLOW_SHIFT BIT(2) 75#define SFC_ISR_TX_EMPTY_SHIFT BIT(3) 76#define SFC_ISR_TX_FINISH_SHIFT BIT(4) 77#define SFC_ISR_BUS_ERR_SHIFT BIT(5) 78#define SFC_ISR_NSPI_ERR_SHIFT BIT(6) 79#define SFC_ISR_DMA_SHIFT BIT(7) 80 81/* FIFO status */ 82#define SFC_FSR 0x20 83#define SFC_FSR_TX_IS_FULL BIT(0) 84#define SFC_FSR_TX_IS_EMPTY BIT(1) 85#define SFC_FSR_RX_IS_EMPTY BIT(2) 86#define SFC_FSR_RX_IS_FULL BIT(3) 87#define SFC_FSR_TXLV_MASK GENMASK(12, 8) 88#define SFC_FSR_TXLV_SHIFT 8 89#define SFC_FSR_RXLV_MASK GENMASK(20, 16) 90#define SFC_FSR_RXLV_SHIFT 16 91 92/* FSM status */ 93#define SFC_SR 0x24 94#define SFC_SR_IS_IDLE 0x0 95#define SFC_SR_IS_BUSY 0x1 96 97/* Raw interrupt status */ 98#define SFC_RISR 0x28 99#define SFC_RISR_RX_FULL BIT(0) 100#define SFC_RISR_RX_UNDERFLOW BIT(1) 101#define SFC_RISR_TX_OVERFLOW BIT(2) 102#define SFC_RISR_TX_EMPTY BIT(3) 103#define SFC_RISR_TRAN_FINISH BIT(4) 104#define SFC_RISR_BUS_ERR BIT(5) 105#define SFC_RISR_NSPI_ERR BIT(6) 106#define SFC_RISR_DMA BIT(7) 107 108/* Version */ 109#define SFC_VER 0x2C 110#define SFC_VER_3 0x3 111#define SFC_VER_4 0x4 112#define SFC_VER_5 0x5 113 114/* Delay line controller resiter */ 115#define SFC_DLL_CTRL0 0x3C 116#define SFC_DLL_CTRL0_SCLK_SMP_DLL BIT(15) 117#define SFC_DLL_CTRL0_DLL_MAX_VER4 0xFFU 118#define SFC_DLL_CTRL0_DLL_MAX_VER5 0x1FFU 119 120/* Master trigger */ 121#define SFC_DMA_TRIGGER 0x80 122#define SFC_DMA_TRIGGER_START 1 123 124/* Src or Dst addr for master */ 125#define SFC_DMA_ADDR 0x84 126 127/* Length control register extension 32GB */ 128#define SFC_LEN_CTRL 0x88 129#define SFC_LEN_CTRL_TRB_SEL 1 130#define SFC_LEN_EXT 0x8C 131 132/* Command */ 133#define SFC_CMD 0x100 134#define SFC_CMD_IDX_SHIFT 0 135#define SFC_CMD_DUMMY_SHIFT 8 136#define SFC_CMD_DIR_SHIFT 12 137#define SFC_CMD_DIR_RD 0 138#define SFC_CMD_DIR_WR 1 139#define SFC_CMD_ADDR_SHIFT 14 140#define SFC_CMD_ADDR_0BITS 0 141#define SFC_CMD_ADDR_24BITS 1 142#define SFC_CMD_ADDR_32BITS 2 143#define SFC_CMD_ADDR_XBITS 3 144#define SFC_CMD_TRAN_BYTES_SHIFT 16 145#define SFC_CMD_CS_SHIFT 30 146 147/* Address */ 148#define SFC_ADDR 0x104 149 150/* Data */ 151#define SFC_DATA 0x108 152 153/* The controller and documentation reports that it supports up to 4 CS 154 * devices (0-3), however I have only been able to test a single CS (CS 0) 155 * due to the configuration of my device. 156 */ 157#define SFC_MAX_CHIPSELECT_NUM 4 158 159/* The SFC can transfer max 16KB - 1 at one time 160 * we set it to 15.5KB here for alignment. 161 */ 162#define SFC_MAX_IOSIZE_VER3 (512 * 31) 163 164/* DMA is only enabled for large data transmission */ 165#define SFC_DMA_TRANS_THRETHOLD (0x40) 166 167/* Maximum clock values from datasheet suggest keeping clock value under 168 * 150MHz. No minimum or average value is suggested. 169 */ 170#define SFC_MAX_SPEED (150 * 1000 * 1000) 171 172struct rockchip_sfc { 173 struct device *dev; 174 void __iomem *regbase; 175 struct clk *hclk; 176 struct clk *clk; 177 u32 frequency; 178 /* virtual mapped addr for dma_buffer */ 179 void *buffer; 180 dma_addr_t dma_buffer; 181 struct completion cp; 182 bool use_dma; 183 u32 max_iosize; 184 u16 version; 185}; 186 187static int rockchip_sfc_reset(struct rockchip_sfc *sfc) 188{ 189 int err; 190 u32 status; 191 192 writel_relaxed(SFC_RCVR_RESET, sfc->regbase + SFC_RCVR); 193 194 err = readl_poll_timeout(sfc->regbase + SFC_RCVR, status, 195 !(status & SFC_RCVR_RESET), 20, 196 jiffies_to_usecs(HZ)); 197 if (err) 198 dev_err(sfc->dev, "SFC reset never finished\n"); 199 200 /* Still need to clear the masked interrupt from RISR */ 201 writel_relaxed(0xFFFFFFFF, sfc->regbase + SFC_ICLR); 202 203 dev_dbg(sfc->dev, "reset\n"); 204 205 return err; 206} 207 208static u16 rockchip_sfc_get_version(struct rockchip_sfc *sfc) 209{ 210 return (u16)(readl(sfc->regbase + SFC_VER) & 0xffff); 211} 212 213static u32 rockchip_sfc_get_max_iosize(struct rockchip_sfc *sfc) 214{ 215 return SFC_MAX_IOSIZE_VER3; 216} 217 218static void rockchip_sfc_irq_unmask(struct rockchip_sfc *sfc, u32 mask) 219{ 220 u32 reg; 221 222 /* Enable transfer complete interrupt */ 223 reg = readl(sfc->regbase + SFC_IMR); 224 reg &= ~mask; 225 writel(reg, sfc->regbase + SFC_IMR); 226} 227 228static void rockchip_sfc_irq_mask(struct rockchip_sfc *sfc, u32 mask) 229{ 230 u32 reg; 231 232 /* Disable transfer finish interrupt */ 233 reg = readl(sfc->regbase + SFC_IMR); 234 reg |= mask; 235 writel(reg, sfc->regbase + SFC_IMR); 236} 237 238static int rockchip_sfc_init(struct rockchip_sfc *sfc) 239{ 240 writel(0, sfc->regbase + SFC_CTRL); 241 writel(0xFFFFFFFF, sfc->regbase + SFC_ICLR); 242 rockchip_sfc_irq_mask(sfc, 0xFFFFFFFF); 243 if (rockchip_sfc_get_version(sfc) >= SFC_VER_4) 244 writel(SFC_LEN_CTRL_TRB_SEL, sfc->regbase + SFC_LEN_CTRL); 245 246 return 0; 247} 248 249static int rockchip_sfc_wait_txfifo_ready(struct rockchip_sfc *sfc, u32 timeout_us) 250{ 251 int ret = 0; 252 u32 status; 253 254 ret = readl_poll_timeout(sfc->regbase + SFC_FSR, status, 255 status & SFC_FSR_TXLV_MASK, 0, 256 timeout_us); 257 if (ret) { 258 dev_dbg(sfc->dev, "sfc wait tx fifo timeout\n"); 259 260 return -ETIMEDOUT; 261 } 262 263 return (status & SFC_FSR_TXLV_MASK) >> SFC_FSR_TXLV_SHIFT; 264} 265 266static int rockchip_sfc_wait_rxfifo_ready(struct rockchip_sfc *sfc, u32 timeout_us) 267{ 268 int ret = 0; 269 u32 status; 270 271 ret = readl_poll_timeout(sfc->regbase + SFC_FSR, status, 272 status & SFC_FSR_RXLV_MASK, 0, 273 timeout_us); 274 if (ret) { 275 dev_dbg(sfc->dev, "sfc wait rx fifo timeout\n"); 276 277 return -ETIMEDOUT; 278 } 279 280 return (status & SFC_FSR_RXLV_MASK) >> SFC_FSR_RXLV_SHIFT; 281} 282 283static void rockchip_sfc_adjust_op_work(struct spi_mem_op *op) 284{ 285 if (unlikely(op->dummy.nbytes && !op->addr.nbytes)) { 286 /* 287 * SFC not support output DUMMY cycles right after CMD cycles, so 288 * treat it as ADDR cycles. 289 */ 290 op->addr.nbytes = op->dummy.nbytes; 291 op->addr.buswidth = op->dummy.buswidth; 292 op->addr.val = 0xFFFFFFFFF; 293 294 op->dummy.nbytes = 0; 295 } 296} 297 298static int rockchip_sfc_xfer_setup(struct rockchip_sfc *sfc, 299 struct spi_mem *mem, 300 const struct spi_mem_op *op, 301 u32 len) 302{ 303 u32 ctrl = 0, cmd = 0; 304 305 /* set CMD */ 306 cmd = op->cmd.opcode; 307 ctrl |= ((op->cmd.buswidth >> 1) << SFC_CTRL_CMD_BITS_SHIFT); 308 309 /* set ADDR */ 310 if (op->addr.nbytes) { 311 if (op->addr.nbytes == 4) { 312 cmd |= SFC_CMD_ADDR_32BITS << SFC_CMD_ADDR_SHIFT; 313 } else if (op->addr.nbytes == 3) { 314 cmd |= SFC_CMD_ADDR_24BITS << SFC_CMD_ADDR_SHIFT; 315 } else { 316 cmd |= SFC_CMD_ADDR_XBITS << SFC_CMD_ADDR_SHIFT; 317 writel(op->addr.nbytes * 8 - 1, sfc->regbase + SFC_ABIT); 318 } 319 320 ctrl |= ((op->addr.buswidth >> 1) << SFC_CTRL_ADDR_BITS_SHIFT); 321 } 322 323 /* set DUMMY */ 324 if (op->dummy.nbytes) { 325 if (op->dummy.buswidth == 4) 326 cmd |= op->dummy.nbytes * 2 << SFC_CMD_DUMMY_SHIFT; 327 else if (op->dummy.buswidth == 2) 328 cmd |= op->dummy.nbytes * 4 << SFC_CMD_DUMMY_SHIFT; 329 else 330 cmd |= op->dummy.nbytes * 8 << SFC_CMD_DUMMY_SHIFT; 331 } 332 333 /* set DATA */ 334 if (sfc->version >= SFC_VER_4) /* Clear it if no data to transfer */ 335 writel(len, sfc->regbase + SFC_LEN_EXT); 336 else 337 cmd |= len << SFC_CMD_TRAN_BYTES_SHIFT; 338 if (len) { 339 if (op->data.dir == SPI_MEM_DATA_OUT) 340 cmd |= SFC_CMD_DIR_WR << SFC_CMD_DIR_SHIFT; 341 342 ctrl |= ((op->data.buswidth >> 1) << SFC_CTRL_DATA_BITS_SHIFT); 343 } 344 if (!len && op->addr.nbytes) 345 cmd |= SFC_CMD_DIR_WR << SFC_CMD_DIR_SHIFT; 346 347 /* set the Controller */ 348 ctrl |= SFC_CTRL_PHASE_SEL_NEGETIVE; 349 cmd |= spi_get_chipselect(mem->spi, 0) << SFC_CMD_CS_SHIFT; 350 351 dev_dbg(sfc->dev, "sfc addr.nbytes=%x(x%d) dummy.nbytes=%x(x%d)\n", 352 op->addr.nbytes, op->addr.buswidth, 353 op->dummy.nbytes, op->dummy.buswidth); 354 dev_dbg(sfc->dev, "sfc ctrl=%x cmd=%x addr=%llx len=%x\n", 355 ctrl, cmd, op->addr.val, len); 356 357 writel(ctrl, sfc->regbase + SFC_CTRL); 358 writel(cmd, sfc->regbase + SFC_CMD); 359 if (op->addr.nbytes) 360 writel(op->addr.val, sfc->regbase + SFC_ADDR); 361 362 return 0; 363} 364 365static int rockchip_sfc_write_fifo(struct rockchip_sfc *sfc, const u8 *buf, int len) 366{ 367 u8 bytes = len & 0x3; 368 u32 dwords; 369 int tx_level; 370 u32 write_words; 371 u32 tmp = 0; 372 373 dwords = len >> 2; 374 while (dwords) { 375 tx_level = rockchip_sfc_wait_txfifo_ready(sfc, 1000); 376 if (tx_level < 0) 377 return tx_level; 378 write_words = min_t(u32, tx_level, dwords); 379 iowrite32_rep(sfc->regbase + SFC_DATA, buf, write_words); 380 buf += write_words << 2; 381 dwords -= write_words; 382 } 383 384 /* write the rest non word aligned bytes */ 385 if (bytes) { 386 tx_level = rockchip_sfc_wait_txfifo_ready(sfc, 1000); 387 if (tx_level < 0) 388 return tx_level; 389 memcpy(&tmp, buf, bytes); 390 writel(tmp, sfc->regbase + SFC_DATA); 391 } 392 393 return len; 394} 395 396static int rockchip_sfc_read_fifo(struct rockchip_sfc *sfc, u8 *buf, int len) 397{ 398 u8 bytes = len & 0x3; 399 u32 dwords; 400 u8 read_words; 401 int rx_level; 402 int tmp; 403 404 /* word aligned access only */ 405 dwords = len >> 2; 406 while (dwords) { 407 rx_level = rockchip_sfc_wait_rxfifo_ready(sfc, 1000); 408 if (rx_level < 0) 409 return rx_level; 410 read_words = min_t(u32, rx_level, dwords); 411 ioread32_rep(sfc->regbase + SFC_DATA, buf, read_words); 412 buf += read_words << 2; 413 dwords -= read_words; 414 } 415 416 /* read the rest non word aligned bytes */ 417 if (bytes) { 418 rx_level = rockchip_sfc_wait_rxfifo_ready(sfc, 1000); 419 if (rx_level < 0) 420 return rx_level; 421 tmp = readl(sfc->regbase + SFC_DATA); 422 memcpy(buf, &tmp, bytes); 423 } 424 425 return len; 426} 427 428static int rockchip_sfc_fifo_transfer_dma(struct rockchip_sfc *sfc, dma_addr_t dma_buf, size_t len) 429{ 430 writel(0xFFFFFFFF, sfc->regbase + SFC_ICLR); 431 writel((u32)dma_buf, sfc->regbase + SFC_DMA_ADDR); 432 writel(SFC_DMA_TRIGGER_START, sfc->regbase + SFC_DMA_TRIGGER); 433 434 return len; 435} 436 437static int rockchip_sfc_xfer_data_poll(struct rockchip_sfc *sfc, 438 const struct spi_mem_op *op, u32 len) 439{ 440 dev_dbg(sfc->dev, "sfc xfer_poll len=%x\n", len); 441 442 if (op->data.dir == SPI_MEM_DATA_OUT) 443 return rockchip_sfc_write_fifo(sfc, op->data.buf.out, len); 444 else 445 return rockchip_sfc_read_fifo(sfc, op->data.buf.in, len); 446} 447 448static int rockchip_sfc_xfer_data_dma(struct rockchip_sfc *sfc, 449 const struct spi_mem_op *op, u32 len) 450{ 451 int ret; 452 453 dev_dbg(sfc->dev, "sfc xfer_dma len=%x\n", len); 454 455 if (op->data.dir == SPI_MEM_DATA_OUT) 456 memcpy(sfc->buffer, op->data.buf.out, len); 457 458 ret = rockchip_sfc_fifo_transfer_dma(sfc, sfc->dma_buffer, len); 459 if (!wait_for_completion_timeout(&sfc->cp, msecs_to_jiffies(2000))) { 460 dev_err(sfc->dev, "DMA wait for transfer finish timeout\n"); 461 ret = -ETIMEDOUT; 462 } 463 rockchip_sfc_irq_mask(sfc, SFC_IMR_DMA); 464 if (op->data.dir == SPI_MEM_DATA_IN) 465 memcpy(op->data.buf.in, sfc->buffer, len); 466 467 return ret; 468} 469 470static int rockchip_sfc_xfer_done(struct rockchip_sfc *sfc, u32 timeout_us) 471{ 472 int ret = 0; 473 u32 status; 474 475 ret = readl_poll_timeout(sfc->regbase + SFC_SR, status, 476 !(status & SFC_SR_IS_BUSY), 477 20, timeout_us); 478 if (ret) { 479 dev_err(sfc->dev, "wait sfc idle timeout\n"); 480 rockchip_sfc_reset(sfc); 481 482 ret = -EIO; 483 } 484 485 return ret; 486} 487 488static int rockchip_sfc_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op) 489{ 490 struct rockchip_sfc *sfc = spi_controller_get_devdata(mem->spi->controller); 491 u32 len = op->data.nbytes; 492 int ret; 493 494 if (unlikely(mem->spi->max_speed_hz != sfc->frequency)) { 495 ret = clk_set_rate(sfc->clk, mem->spi->max_speed_hz); 496 if (ret) 497 return ret; 498 sfc->frequency = mem->spi->max_speed_hz; 499 dev_dbg(sfc->dev, "set_freq=%dHz real_freq=%ldHz\n", 500 sfc->frequency, clk_get_rate(sfc->clk)); 501 } 502 503 rockchip_sfc_adjust_op_work((struct spi_mem_op *)op); 504 rockchip_sfc_xfer_setup(sfc, mem, op, len); 505 if (len) { 506 if (likely(sfc->use_dma) && len >= SFC_DMA_TRANS_THRETHOLD) { 507 init_completion(&sfc->cp); 508 rockchip_sfc_irq_unmask(sfc, SFC_IMR_DMA); 509 ret = rockchip_sfc_xfer_data_dma(sfc, op, len); 510 } else { 511 ret = rockchip_sfc_xfer_data_poll(sfc, op, len); 512 } 513 514 if (ret != len) { 515 dev_err(sfc->dev, "xfer data failed ret %d dir %d\n", ret, op->data.dir); 516 517 return -EIO; 518 } 519 } 520 521 return rockchip_sfc_xfer_done(sfc, 100000); 522} 523 524static int rockchip_sfc_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) 525{ 526 struct rockchip_sfc *sfc = spi_controller_get_devdata(mem->spi->controller); 527 528 op->data.nbytes = min(op->data.nbytes, sfc->max_iosize); 529 530 return 0; 531} 532 533static const struct spi_controller_mem_ops rockchip_sfc_mem_ops = { 534 .exec_op = rockchip_sfc_exec_mem_op, 535 .adjust_op_size = rockchip_sfc_adjust_op_size, 536}; 537 538static irqreturn_t rockchip_sfc_irq_handler(int irq, void *dev_id) 539{ 540 struct rockchip_sfc *sfc = dev_id; 541 u32 reg; 542 543 reg = readl(sfc->regbase + SFC_RISR); 544 545 /* Clear interrupt */ 546 writel_relaxed(reg, sfc->regbase + SFC_ICLR); 547 548 if (reg & SFC_RISR_DMA) { 549 complete(&sfc->cp); 550 551 return IRQ_HANDLED; 552 } 553 554 return IRQ_NONE; 555} 556 557static int rockchip_sfc_probe(struct platform_device *pdev) 558{ 559 struct device *dev = &pdev->dev; 560 struct spi_controller *host; 561 struct rockchip_sfc *sfc; 562 int ret; 563 564 host = devm_spi_alloc_host(&pdev->dev, sizeof(*sfc)); 565 if (!host) 566 return -ENOMEM; 567 568 host->flags = SPI_CONTROLLER_HALF_DUPLEX; 569 host->mem_ops = &rockchip_sfc_mem_ops; 570 host->dev.of_node = pdev->dev.of_node; 571 host->mode_bits = SPI_TX_QUAD | SPI_TX_DUAL | SPI_RX_QUAD | SPI_RX_DUAL; 572 host->max_speed_hz = SFC_MAX_SPEED; 573 host->num_chipselect = SFC_MAX_CHIPSELECT_NUM; 574 575 sfc = spi_controller_get_devdata(host); 576 sfc->dev = dev; 577 578 sfc->regbase = devm_platform_ioremap_resource(pdev, 0); 579 if (IS_ERR(sfc->regbase)) 580 return PTR_ERR(sfc->regbase); 581 582 sfc->clk = devm_clk_get(&pdev->dev, "clk_sfc"); 583 if (IS_ERR(sfc->clk)) { 584 dev_err(&pdev->dev, "Failed to get sfc interface clk\n"); 585 return PTR_ERR(sfc->clk); 586 } 587 588 sfc->hclk = devm_clk_get(&pdev->dev, "hclk_sfc"); 589 if (IS_ERR(sfc->hclk)) { 590 dev_err(&pdev->dev, "Failed to get sfc ahb clk\n"); 591 return PTR_ERR(sfc->hclk); 592 } 593 594 sfc->use_dma = !of_property_read_bool(sfc->dev->of_node, 595 "rockchip,sfc-no-dma"); 596 597 if (sfc->use_dma) { 598 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); 599 if (ret) { 600 dev_warn(dev, "Unable to set dma mask\n"); 601 return ret; 602 } 603 604 sfc->buffer = dmam_alloc_coherent(dev, SFC_MAX_IOSIZE_VER3, 605 &sfc->dma_buffer, 606 GFP_KERNEL); 607 if (!sfc->buffer) 608 return -ENOMEM; 609 } 610 611 ret = clk_prepare_enable(sfc->hclk); 612 if (ret) { 613 dev_err(&pdev->dev, "Failed to enable ahb clk\n"); 614 goto err_hclk; 615 } 616 617 ret = clk_prepare_enable(sfc->clk); 618 if (ret) { 619 dev_err(&pdev->dev, "Failed to enable interface clk\n"); 620 goto err_clk; 621 } 622 623 /* Find the irq */ 624 ret = platform_get_irq(pdev, 0); 625 if (ret < 0) 626 goto err_irq; 627 628 ret = devm_request_irq(dev, ret, rockchip_sfc_irq_handler, 629 0, pdev->name, sfc); 630 if (ret) { 631 dev_err(dev, "Failed to request irq\n"); 632 633 goto err_irq; 634 } 635 636 ret = rockchip_sfc_init(sfc); 637 if (ret) 638 goto err_irq; 639 640 sfc->max_iosize = rockchip_sfc_get_max_iosize(sfc); 641 sfc->version = rockchip_sfc_get_version(sfc); 642 643 ret = spi_register_controller(host); 644 if (ret) 645 goto err_irq; 646 647 return 0; 648 649err_irq: 650 clk_disable_unprepare(sfc->clk); 651err_clk: 652 clk_disable_unprepare(sfc->hclk); 653err_hclk: 654 return ret; 655} 656 657static void rockchip_sfc_remove(struct platform_device *pdev) 658{ 659 struct spi_controller *host = platform_get_drvdata(pdev); 660 struct rockchip_sfc *sfc = platform_get_drvdata(pdev); 661 662 spi_unregister_controller(host); 663 664 clk_disable_unprepare(sfc->clk); 665 clk_disable_unprepare(sfc->hclk); 666} 667 668static const struct of_device_id rockchip_sfc_dt_ids[] = { 669 { .compatible = "rockchip,sfc"}, 670 { /* sentinel */ } 671}; 672MODULE_DEVICE_TABLE(of, rockchip_sfc_dt_ids); 673 674static struct platform_driver rockchip_sfc_driver = { 675 .driver = { 676 .name = "rockchip-sfc", 677 .of_match_table = rockchip_sfc_dt_ids, 678 }, 679 .probe = rockchip_sfc_probe, 680 .remove_new = rockchip_sfc_remove, 681}; 682module_platform_driver(rockchip_sfc_driver); 683 684MODULE_LICENSE("GPL v2"); 685MODULE_DESCRIPTION("Rockchip Serial Flash Controller Driver"); 686MODULE_AUTHOR("Shawn Lin <shawn.lin@rock-chips.com>"); 687MODULE_AUTHOR("Chris Morgan <macromorgan@hotmail.com>"); 688MODULE_AUTHOR("Jon Lin <Jon.lin@rock-chips.com>"); 689