1 // SPDX-License-Identifier: GPL-2.0-only 2 // 3 // HiSilicon SPI NOR V3XX Flash Controller Driver for hi16xx chipsets 4 // 5 // Copyright (c) 2019 HiSilicon Technologies Co., Ltd. 6 // Author: John Garry <john.garry@huawei.com> 7 8 #include <linux/bitops.h> 9 #include <linux/completion.h> 10 #include <linux/dmi.h> 11 #include <linux/interrupt.h> 12 #include <linux/iopoll.h> 13 #include <linux/module.h> 14 #include <linux/mod_devicetable.h> 15 #include <linux/platform_device.h> 16 #include <linux/slab.h> 17 #include <linux/spi/spi.h> 18 #include <linux/spi/spi-mem.h> 19 20 #define HISI_SFC_V3XX_VERSION (0x1f8) 21 22 #define HISI_SFC_V3XX_GLB_CFG (0x100) 23 #define HISI_SFC_V3XX_GLB_CFG_CS0_ADDR_MODE BIT(2) 24 #define HISI_SFC_V3XX_RAW_INT_STAT (0x120) 25 #define HISI_SFC_V3XX_INT_STAT (0x124) 26 #define HISI_SFC_V3XX_INT_MASK (0x128) 27 #define HISI_SFC_V3XX_INT_CLR (0x12c) 28 #define HISI_SFC_V3XX_CMD_CFG (0x300) 29 #define HISI_SFC_V3XX_CMD_CFG_DATA_CNT_OFF 9 30 #define HISI_SFC_V3XX_CMD_CFG_RW_MSK BIT(8) 31 #define HISI_SFC_V3XX_CMD_CFG_DATA_EN_MSK BIT(7) 32 #define HISI_SFC_V3XX_CMD_CFG_DUMMY_CNT_OFF 4 33 #define HISI_SFC_V3XX_CMD_CFG_ADDR_EN_MSK BIT(3) 34 #define HISI_SFC_V3XX_CMD_CFG_CS_SEL_OFF 1 35 #define HISI_SFC_V3XX_CMD_CFG_START_MSK BIT(0) 36 #define HISI_SFC_V3XX_CMD_INS (0x308) 37 #define HISI_SFC_V3XX_CMD_ADDR (0x30c) 38 #define HISI_SFC_V3XX_CMD_DATABUF0 (0x400) 39 40 /* Common definition of interrupt bit masks */ 41 #define HISI_SFC_V3XX_INT_MASK_ALL (0x1ff) /* all the masks */ 42 #define HISI_SFC_V3XX_INT_MASK_CPLT BIT(0) /* command execution complete */ 43 #define HISI_SFC_V3XX_INT_MASK_PP_ERR BIT(2) /* page progrom error */ 44 #define HISI_SFC_V3XX_INT_MASK_IACCES BIT(5) /* error visiting inaccessible/ 45 * protected address 46 */ 47 48 /* IO Mode definition in HISI_SFC_V3XX_CMD_CFG */ 49 #define HISI_SFC_V3XX_STD (0 << 17) 50 #define HISI_SFC_V3XX_DIDO (1 << 17) 51 #define HISI_SFC_V3XX_DIO (2 << 17) 52 #define HISI_SFC_V3XX_FULL_DIO (3 << 17) 53 #define HISI_SFC_V3XX_QIQO (5 << 17) 54 #define HISI_SFC_V3XX_QIO (6 << 17) 55 #define HISI_SFC_V3XX_FULL_QIO (7 << 17) 56 57 /* 58 * The IO modes lookup table. hisi_sfc_v3xx_io_modes[(z - 1) / 2][y / 2][x / 2] 59 * stands for x-y-z mode, as described in SFDP terminology. -EIO indicates 60 * an invalid mode. 61 */ 62 static const int hisi_sfc_v3xx_io_modes[2][3][3] = { 63 { 64 { HISI_SFC_V3XX_DIDO, HISI_SFC_V3XX_DIDO, HISI_SFC_V3XX_DIDO }, 65 { HISI_SFC_V3XX_DIO, HISI_SFC_V3XX_FULL_DIO, -EIO }, 66 { -EIO, -EIO, -EIO }, 67 }, 68 { 69 { HISI_SFC_V3XX_QIQO, HISI_SFC_V3XX_QIQO, HISI_SFC_V3XX_QIQO }, 70 { -EIO, -EIO, -EIO }, 71 { HISI_SFC_V3XX_QIO, -EIO, HISI_SFC_V3XX_FULL_QIO }, 72 }, 73 }; 74 75 struct hisi_sfc_v3xx_host { 76 struct device *dev; 77 void __iomem *regbase; 78 int max_cmd_dword; 79 struct completion *completion; 80 u8 address_mode; 81 int irq; 82 }; 83 84 static void hisi_sfc_v3xx_disable_int(struct hisi_sfc_v3xx_host *host) 85 { 86 writel(0, host->regbase + HISI_SFC_V3XX_INT_MASK); 87 } 88 89 static void hisi_sfc_v3xx_enable_int(struct hisi_sfc_v3xx_host *host) 90 { 91 writel(HISI_SFC_V3XX_INT_MASK_ALL, host->regbase + HISI_SFC_V3XX_INT_MASK); 92 } 93 94 static void hisi_sfc_v3xx_clear_int(struct hisi_sfc_v3xx_host *host) 95 { 96 writel(HISI_SFC_V3XX_INT_MASK_ALL, host->regbase + HISI_SFC_V3XX_INT_CLR); 97 } 98 99 /* 100 * The interrupt status register indicates whether an error occurs 101 * after per operation. Check it, and clear the interrupts for 102 * next time judgement. 103 */ 104 static int hisi_sfc_v3xx_handle_completion(struct hisi_sfc_v3xx_host *host) 105 { 106 u32 reg; 107 108 reg = readl(host->regbase + HISI_SFC_V3XX_RAW_INT_STAT); 109 hisi_sfc_v3xx_clear_int(host); 110 111 if (reg & HISI_SFC_V3XX_INT_MASK_IACCES) { 112 dev_err(host->dev, "fail to access protected address\n"); 113 return -EIO; 114 } 115 116 if (reg & HISI_SFC_V3XX_INT_MASK_PP_ERR) { 117 dev_err(host->dev, "page program operation failed\n"); 118 return -EIO; 119 } 120 121 /* 122 * The other bits of the interrupt registers is not currently 123 * used and probably not be triggered in this driver. When it 124 * happens, we regard it as an unsupported error here. 125 */ 126 if (!(reg & HISI_SFC_V3XX_INT_MASK_CPLT)) { 127 dev_err(host->dev, "unsupported error occurred, status=0x%x\n", reg); 128 return -EIO; 129 } 130 131 return 0; 132 } 133 134 #define HISI_SFC_V3XX_WAIT_TIMEOUT_US 1000000 135 #define HISI_SFC_V3XX_WAIT_POLL_INTERVAL_US 10 136 137 static int hisi_sfc_v3xx_wait_cmd_idle(struct hisi_sfc_v3xx_host *host) 138 { 139 u32 reg; 140 141 return readl_poll_timeout(host->regbase + HISI_SFC_V3XX_CMD_CFG, reg, 142 !(reg & HISI_SFC_V3XX_CMD_CFG_START_MSK), 143 HISI_SFC_V3XX_WAIT_POLL_INTERVAL_US, 144 HISI_SFC_V3XX_WAIT_TIMEOUT_US); 145 } 146 147 static int hisi_sfc_v3xx_adjust_op_size(struct spi_mem *mem, 148 struct spi_mem_op *op) 149 { 150 struct spi_device *spi = mem->spi; 151 struct hisi_sfc_v3xx_host *host; 152 uintptr_t addr = (uintptr_t)op->data.buf.in; 153 int max_byte_count; 154 155 host = spi_controller_get_devdata(spi->controller); 156 157 max_byte_count = host->max_cmd_dword * 4; 158 159 if (!IS_ALIGNED(addr, 4) && op->data.nbytes >= 4) 160 op->data.nbytes = 4 - (addr % 4); 161 else if (op->data.nbytes > max_byte_count) 162 op->data.nbytes = max_byte_count; 163 164 return 0; 165 } 166 167 /* 168 * The controller only supports Standard SPI mode, Dual mode and 169 * Quad mode. Double sanitize the ops here to avoid OOB access. 170 */ 171 static bool hisi_sfc_v3xx_supports_op(struct spi_mem *mem, 172 const struct spi_mem_op *op) 173 { 174 struct spi_device *spi = mem->spi; 175 struct hisi_sfc_v3xx_host *host; 176 177 host = spi_controller_get_devdata(spi->controller); 178 179 if (op->data.buswidth > 4 || op->dummy.buswidth > 4 || 180 op->addr.buswidth > 4 || op->cmd.buswidth > 4) 181 return false; 182 183 if (op->addr.nbytes != host->address_mode && op->addr.nbytes) 184 return false; 185 186 return spi_mem_default_supports_op(mem, op); 187 } 188 189 /* 190 * memcpy_{to,from}io doesn't gurantee 32b accesses - which we require for the 191 * DATABUF registers -so use __io{read,write}32_copy when possible. For 192 * trailing bytes, copy them byte-by-byte from the DATABUF register, as we 193 * can't clobber outside the source/dest buffer. 194 * 195 * For efficient data read/write, we try to put any start 32b unaligned data 196 * into a separate transaction in hisi_sfc_v3xx_adjust_op_size(). 197 */ 198 static void hisi_sfc_v3xx_read_databuf(struct hisi_sfc_v3xx_host *host, 199 u8 *to, unsigned int len) 200 { 201 void __iomem *from; 202 int i; 203 204 from = host->regbase + HISI_SFC_V3XX_CMD_DATABUF0; 205 206 if (IS_ALIGNED((uintptr_t)to, 4)) { 207 int words = len / 4; 208 209 __ioread32_copy(to, from, words); 210 211 len -= words * 4; 212 if (len) { 213 u32 val; 214 215 to += words * 4; 216 from += words * 4; 217 218 val = __raw_readl(from); 219 220 for (i = 0; i < len; i++, val >>= 8, to++) 221 *to = (u8)val; 222 } 223 } else { 224 for (i = 0; i < DIV_ROUND_UP(len, 4); i++, from += 4) { 225 u32 val = __raw_readl(from); 226 int j; 227 228 for (j = 0; j < 4 && (j + (i * 4) < len); 229 to++, val >>= 8, j++) 230 *to = (u8)val; 231 } 232 } 233 } 234 235 static void hisi_sfc_v3xx_write_databuf(struct hisi_sfc_v3xx_host *host, 236 const u8 *from, unsigned int len) 237 { 238 void __iomem *to; 239 int i; 240 241 to = host->regbase + HISI_SFC_V3XX_CMD_DATABUF0; 242 243 if (IS_ALIGNED((uintptr_t)from, 4)) { 244 int words = len / 4; 245 246 __iowrite32_copy(to, from, words); 247 248 len -= words * 4; 249 if (len) { 250 u32 val = 0; 251 252 to += words * 4; 253 from += words * 4; 254 255 for (i = 0; i < len; i++, from++) 256 val |= *from << i * 8; 257 __raw_writel(val, to); 258 } 259 260 } else { 261 for (i = 0; i < DIV_ROUND_UP(len, 4); i++, to += 4) { 262 u32 val = 0; 263 int j; 264 265 for (j = 0; j < 4 && (j + (i * 4) < len); 266 from++, j++) 267 val |= *from << j * 8; 268 __raw_writel(val, to); 269 } 270 } 271 } 272 273 static int hisi_sfc_v3xx_start_bus(struct hisi_sfc_v3xx_host *host, 274 const struct spi_mem_op *op, 275 u8 chip_select) 276 { 277 int len = op->data.nbytes, buswidth_mode; 278 u32 config = 0; 279 280 if (op->addr.nbytes) 281 config |= HISI_SFC_V3XX_CMD_CFG_ADDR_EN_MSK; 282 283 if (op->data.buswidth == 0 || op->data.buswidth == 1) { 284 buswidth_mode = HISI_SFC_V3XX_STD; 285 } else { 286 int data_idx, addr_idx, cmd_idx; 287 288 data_idx = (op->data.buswidth - 1) / 2; 289 addr_idx = op->addr.buswidth / 2; 290 cmd_idx = op->cmd.buswidth / 2; 291 buswidth_mode = hisi_sfc_v3xx_io_modes[data_idx][addr_idx][cmd_idx]; 292 } 293 if (buswidth_mode < 0) 294 return buswidth_mode; 295 config |= buswidth_mode; 296 297 if (op->data.dir != SPI_MEM_NO_DATA) { 298 config |= (len - 1) << HISI_SFC_V3XX_CMD_CFG_DATA_CNT_OFF; 299 config |= HISI_SFC_V3XX_CMD_CFG_DATA_EN_MSK; 300 } 301 302 if (op->data.dir == SPI_MEM_DATA_IN) 303 config |= HISI_SFC_V3XX_CMD_CFG_RW_MSK; 304 305 config |= op->dummy.nbytes << HISI_SFC_V3XX_CMD_CFG_DUMMY_CNT_OFF | 306 chip_select << HISI_SFC_V3XX_CMD_CFG_CS_SEL_OFF | 307 HISI_SFC_V3XX_CMD_CFG_START_MSK; 308 309 writel(op->addr.val, host->regbase + HISI_SFC_V3XX_CMD_ADDR); 310 writel(op->cmd.opcode, host->regbase + HISI_SFC_V3XX_CMD_INS); 311 312 writel(config, host->regbase + HISI_SFC_V3XX_CMD_CFG); 313 314 return 0; 315 } 316 317 static int hisi_sfc_v3xx_generic_exec_op(struct hisi_sfc_v3xx_host *host, 318 const struct spi_mem_op *op, 319 u8 chip_select) 320 { 321 DECLARE_COMPLETION_ONSTACK(done); 322 int ret; 323 324 if (host->irq) { 325 host->completion = &done; 326 hisi_sfc_v3xx_enable_int(host); 327 } 328 329 if (op->data.dir == SPI_MEM_DATA_OUT) 330 hisi_sfc_v3xx_write_databuf(host, op->data.buf.out, op->data.nbytes); 331 332 ret = hisi_sfc_v3xx_start_bus(host, op, chip_select); 333 if (ret) 334 return ret; 335 336 if (host->irq) { 337 ret = wait_for_completion_timeout(host->completion, 338 usecs_to_jiffies(HISI_SFC_V3XX_WAIT_TIMEOUT_US)); 339 if (!ret) 340 ret = -ETIMEDOUT; 341 else 342 ret = 0; 343 344 hisi_sfc_v3xx_disable_int(host); 345 synchronize_irq(host->irq); 346 host->completion = NULL; 347 } else { 348 ret = hisi_sfc_v3xx_wait_cmd_idle(host); 349 } 350 if (hisi_sfc_v3xx_handle_completion(host) || ret) 351 return -EIO; 352 353 if (op->data.dir == SPI_MEM_DATA_IN) 354 hisi_sfc_v3xx_read_databuf(host, op->data.buf.in, op->data.nbytes); 355 356 return 0; 357 } 358 359 static int hisi_sfc_v3xx_exec_op(struct spi_mem *mem, 360 const struct spi_mem_op *op) 361 { 362 struct hisi_sfc_v3xx_host *host; 363 struct spi_device *spi = mem->spi; 364 u8 chip_select = spi_get_chipselect(spi, 0); 365 366 host = spi_controller_get_devdata(spi->controller); 367 368 return hisi_sfc_v3xx_generic_exec_op(host, op, chip_select); 369 } 370 371 static const struct spi_controller_mem_ops hisi_sfc_v3xx_mem_ops = { 372 .adjust_op_size = hisi_sfc_v3xx_adjust_op_size, 373 .supports_op = hisi_sfc_v3xx_supports_op, 374 .exec_op = hisi_sfc_v3xx_exec_op, 375 }; 376 377 static irqreturn_t hisi_sfc_v3xx_isr(int irq, void *data) 378 { 379 struct hisi_sfc_v3xx_host *host = data; 380 u32 reg; 381 382 reg = readl(host->regbase + HISI_SFC_V3XX_INT_STAT); 383 if (!reg) 384 return IRQ_NONE; 385 386 hisi_sfc_v3xx_disable_int(host); 387 388 complete(host->completion); 389 390 return IRQ_HANDLED; 391 } 392 393 static int hisi_sfc_v3xx_buswidth_override_bits; 394 395 /* 396 * ACPI FW does not allow us to currently set the device buswidth, so quirk it 397 * depending on the board. 398 */ 399 static int __init hisi_sfc_v3xx_dmi_quirk(const struct dmi_system_id *d) 400 { 401 hisi_sfc_v3xx_buswidth_override_bits = SPI_RX_QUAD | SPI_TX_QUAD; 402 403 return 0; 404 } 405 406 static const struct dmi_system_id hisi_sfc_v3xx_dmi_quirk_table[] = { 407 { 408 .callback = hisi_sfc_v3xx_dmi_quirk, 409 .matches = { 410 DMI_MATCH(DMI_SYS_VENDOR, "Huawei"), 411 DMI_MATCH(DMI_PRODUCT_NAME, "D06"), 412 }, 413 }, 414 { 415 .callback = hisi_sfc_v3xx_dmi_quirk, 416 .matches = { 417 DMI_MATCH(DMI_SYS_VENDOR, "Huawei"), 418 DMI_MATCH(DMI_PRODUCT_NAME, "TaiShan 2280 V2"), 419 }, 420 }, 421 { 422 .callback = hisi_sfc_v3xx_dmi_quirk, 423 .matches = { 424 DMI_MATCH(DMI_SYS_VENDOR, "Huawei"), 425 DMI_MATCH(DMI_PRODUCT_NAME, "TaiShan 200 (Model 2280)"), 426 }, 427 }, 428 {} 429 }; 430 431 static int hisi_sfc_v3xx_probe(struct platform_device *pdev) 432 { 433 struct device *dev = &pdev->dev; 434 struct hisi_sfc_v3xx_host *host; 435 struct spi_controller *ctlr; 436 u32 version, glb_config; 437 int ret; 438 439 ctlr = spi_alloc_host(&pdev->dev, sizeof(*host)); 440 if (!ctlr) 441 return -ENOMEM; 442 443 ctlr->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | 444 SPI_TX_DUAL | SPI_TX_QUAD; 445 446 ctlr->buswidth_override_bits = hisi_sfc_v3xx_buswidth_override_bits; 447 448 host = spi_controller_get_devdata(ctlr); 449 host->dev = dev; 450 451 platform_set_drvdata(pdev, host); 452 453 host->regbase = devm_platform_ioremap_resource(pdev, 0); 454 if (IS_ERR(host->regbase)) { 455 ret = PTR_ERR(host->regbase); 456 goto err_put_host; 457 } 458 459 host->irq = platform_get_irq_optional(pdev, 0); 460 if (host->irq == -EPROBE_DEFER) { 461 ret = -EPROBE_DEFER; 462 goto err_put_host; 463 } 464 465 hisi_sfc_v3xx_disable_int(host); 466 467 if (host->irq > 0) { 468 ret = devm_request_irq(dev, host->irq, hisi_sfc_v3xx_isr, 0, 469 "hisi-sfc-v3xx", host); 470 471 if (ret) { 472 dev_err(dev, "failed to request irq%d, ret = %d\n", host->irq, ret); 473 host->irq = 0; 474 } 475 } else { 476 host->irq = 0; 477 } 478 479 ctlr->bus_num = -1; 480 ctlr->num_chipselect = 1; 481 ctlr->mem_ops = &hisi_sfc_v3xx_mem_ops; 482 483 /* 484 * The address mode of the controller is either 3 or 4, 485 * which is indicated by the address mode bit in 486 * the global config register. The register is read only 487 * for the OS driver. 488 */ 489 glb_config = readl(host->regbase + HISI_SFC_V3XX_GLB_CFG); 490 if (glb_config & HISI_SFC_V3XX_GLB_CFG_CS0_ADDR_MODE) 491 host->address_mode = 4; 492 else 493 host->address_mode = 3; 494 495 version = readl(host->regbase + HISI_SFC_V3XX_VERSION); 496 497 if (version >= 0x351) 498 host->max_cmd_dword = 64; 499 else 500 host->max_cmd_dword = 16; 501 502 ret = devm_spi_register_controller(dev, ctlr); 503 if (ret) 504 goto err_put_host; 505 506 dev_info(&pdev->dev, "hw version 0x%x, %s mode.\n", 507 version, host->irq ? "irq" : "polling"); 508 509 return 0; 510 511 err_put_host: 512 spi_controller_put(ctlr); 513 return ret; 514 } 515 516 static const struct acpi_device_id hisi_sfc_v3xx_acpi_ids[] = { 517 {"HISI0341", 0}, 518 {} 519 }; 520 MODULE_DEVICE_TABLE(acpi, hisi_sfc_v3xx_acpi_ids); 521 522 static struct platform_driver hisi_sfc_v3xx_spi_driver = { 523 .driver = { 524 .name = "hisi-sfc-v3xx", 525 .acpi_match_table = hisi_sfc_v3xx_acpi_ids, 526 }, 527 .probe = hisi_sfc_v3xx_probe, 528 }; 529 530 static int __init hisi_sfc_v3xx_spi_init(void) 531 { 532 dmi_check_system(hisi_sfc_v3xx_dmi_quirk_table); 533 534 return platform_driver_register(&hisi_sfc_v3xx_spi_driver); 535 } 536 537 static void __exit hisi_sfc_v3xx_spi_exit(void) 538 { 539 platform_driver_unregister(&hisi_sfc_v3xx_spi_driver); 540 } 541 542 module_init(hisi_sfc_v3xx_spi_init); 543 module_exit(hisi_sfc_v3xx_spi_exit); 544 545 MODULE_LICENSE("GPL"); 546 MODULE_AUTHOR("John Garry <john.garry@huawei.com>"); 547 MODULE_DESCRIPTION("HiSilicon SPI NOR V3XX Flash Controller Driver for hi16xx chipsets"); 548