drivers/mtd/spi-nor/hisi-sfc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * HiSilicon SPI Nor Flash Controller Driver
   4  *
   5  * Copyright (c) 2015-2016 HiSilicon Technologies Co., Ltd.
   6  */
   7 #include <linux/bitops.h>
   8 #include <linux/clk.h>
   9 #include <linux/dma-mapping.h>
  10 #include <linux/iopoll.h>
  11 #include <linux/module.h>
  12 #include <linux/mtd/mtd.h>
  13 #include <linux/mtd/spi-nor.h>
  14 #include <linux/of.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/slab.h>
  17
  18 /* Hardware register offsets and field definitions */
  19 #define FMC_CFG                         0x00
  20 #define FMC_CFG_OP_MODE_MASK            BIT_MASK(0)
  21 #define FMC_CFG_OP_MODE_BOOT            0
  22 #define FMC_CFG_OP_MODE_NORMAL          1
  23 #define FMC_CFG_FLASH_SEL(type)         (((type) & 0x3) << 1)
  24 #define FMC_CFG_FLASH_SEL_MASK          0x6
  25 #define FMC_ECC_TYPE(type)              (((type) & 0x7) << 5)
  26 #define FMC_ECC_TYPE_MASK               GENMASK(7, 5)
  27 #define SPI_NOR_ADDR_MODE_MASK          BIT_MASK(10)
  28 #define SPI_NOR_ADDR_MODE_3BYTES        (0x0 << 10)
  29 #define SPI_NOR_ADDR_MODE_4BYTES        (0x1 << 10)
  30 #define FMC_GLOBAL_CFG                  0x04
  31 #define FMC_GLOBAL_CFG_WP_ENABLE        BIT(6)
  32 #define FMC_SPI_TIMING_CFG              0x08
  33 #define TIMING_CFG_TCSH(nr)             (((nr) & 0xf) << 8)
  34 #define TIMING_CFG_TCSS(nr)             (((nr) & 0xf) << 4)
  35 #define TIMING_CFG_TSHSL(nr)            ((nr) & 0xf)
  36 #define CS_HOLD_TIME                    0x6
  37 #define CS_SETUP_TIME                   0x6
  38 #define CS_DESELECT_TIME                0xf
  39 #define FMC_INT                         0x18
  40 #define FMC_INT_OP_DONE                 BIT(0)
  41 #define FMC_INT_CLR                     0x20
  42 #define FMC_CMD                         0x24
  43 #define FMC_CMD_CMD1(cmd)               ((cmd) & 0xff)
  44 #define FMC_ADDRL                       0x2c
  45 #define FMC_OP_CFG                      0x30
  46 #define OP_CFG_FM_CS(cs)                ((cs) << 11)
  47 #define OP_CFG_MEM_IF_TYPE(type)        (((type) & 0x7) << 7)
  48 #define OP_CFG_ADDR_NUM(addr)           (((addr) & 0x7) << 4)
  49 #define OP_CFG_DUMMY_NUM(dummy)         ((dummy) & 0xf)
  50 #define FMC_DATA_NUM                    0x38
  51 #define FMC_DATA_NUM_CNT(cnt)           ((cnt) & GENMASK(13, 0))
  52 #define FMC_OP                          0x3c
  53 #define FMC_OP_DUMMY_EN                 BIT(8)
  54 #define FMC_OP_CMD1_EN                  BIT(7)
  55 #define FMC_OP_ADDR_EN                  BIT(6)
  56 #define FMC_OP_WRITE_DATA_EN            BIT(5)
  57 #define FMC_OP_READ_DATA_EN             BIT(2)
  58 #define FMC_OP_READ_STATUS_EN           BIT(1)
  59 #define FMC_OP_REG_OP_START             BIT(0)
  60 #define FMC_DMA_LEN                     0x40
  61 #define FMC_DMA_LEN_SET(len)            ((len) & GENMASK(27, 0))
  62 #define FMC_DMA_SADDR_D0                0x4c
  63 #define HIFMC_DMA_MAX_LEN               (4096)
  64 #define HIFMC_DMA_MASK                  (HIFMC_DMA_MAX_LEN - 1)
  65 #define FMC_OP_DMA                      0x68
  66 #define OP_CTRL_RD_OPCODE(code)         (((code) & 0xff) << 16)
  67 #define OP_CTRL_WR_OPCODE(code)         (((code) & 0xff) << 8)
  68 #define OP_CTRL_RW_OP(op)               ((op) << 1)
  69 #define OP_CTRL_DMA_OP_READY            BIT(0)
  70 #define FMC_OP_READ                     0x0
  71 #define FMC_OP_WRITE                    0x1
  72 #define FMC_WAIT_TIMEOUT                1000000
  73
  74 enum hifmc_iftype {
  75         IF_TYPE_STD,
  76         IF_TYPE_DUAL,
  77         IF_TYPE_DIO,
  78         IF_TYPE_QUAD,
  79         IF_TYPE_QIO,
  80 };
  81
  82 struct hifmc_priv {
  83         u32 chipselect;
  84         u32 clkrate;
  85         struct hifmc_host *host;
  86 };
  87
  88 #define HIFMC_MAX_CHIP_NUM              2
  89 struct hifmc_host {
  90         struct device *dev;
  91         struct mutex lock;
  92
  93         void __iomem *regbase;
  94         void __iomem *iobase;
  95         struct clk *clk;
  96         void *buffer;
  97         dma_addr_t dma_buffer;
  98
  99         struct spi_nor  *nor[HIFMC_MAX_CHIP_NUM];
 100         u32 num_chip;
 101 };
 102
 103 static inline int hisi_spi_nor_wait_op_finish(struct hifmc_host *host)
 104 {
 105         u32 reg;
 106
 107         return readl_poll_timeout(host->regbase + FMC_INT, reg,
 108                 (reg & FMC_INT_OP_DONE), 0, FMC_WAIT_TIMEOUT);
 109 }
 110
 111 static int hisi_spi_nor_get_if_type(enum spi_nor_protocol proto)
 112 {
 113         enum hifmc_iftype if_type;
 114
 115         switch (proto) {
 116         case SNOR_PROTO_1_1_2:
 117                 if_type = IF_TYPE_DUAL;
 118                 break;
 119         case SNOR_PROTO_1_2_2:
 120                 if_type = IF_TYPE_DIO;
 121                 break;
 122         case SNOR_PROTO_1_1_4:
 123                 if_type = IF_TYPE_QUAD;
 124                 break;
 125         case SNOR_PROTO_1_4_4:
 126                 if_type = IF_TYPE_QIO;
 127                 break;
 128         case SNOR_PROTO_1_1_1:
 129         default:
 130                 if_type = IF_TYPE_STD;
 131                 break;
 132         }
 133
 134         return if_type;
 135 }
 136
 137 static void hisi_spi_nor_init(struct hifmc_host *host)
 138 {
 139         u32 reg;
 140
 141         reg = TIMING_CFG_TCSH(CS_HOLD_TIME)
 142                 | TIMING_CFG_TCSS(CS_SETUP_TIME)
 143                 | TIMING_CFG_TSHSL(CS_DESELECT_TIME);
 144         writel(reg, host->regbase + FMC_SPI_TIMING_CFG);
 145 }
 146
 147 static int hisi_spi_nor_prep(struct spi_nor *nor, enum spi_nor_ops ops)
 148 {
 149         struct hifmc_priv *priv = nor->priv;
 150         struct hifmc_host *host = priv->host;
 151         int ret;
 152
 153         mutex_lock(&host->lock);
 154
 155         ret = clk_set_rate(host->clk, priv->clkrate);
 156         if (ret)
 157                 goto out;
 158
 159         ret = clk_prepare_enable(host->clk);
 160         if (ret)
 161                 goto out;
 162
 163         return 0;
 164
 165 out:
 166         mutex_unlock(&host->lock);
 167         return ret;
 168 }
 169
 170 static void hisi_spi_nor_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
 171 {
 172         struct hifmc_priv *priv = nor->priv;
 173         struct hifmc_host *host = priv->host;
 174
 175         clk_disable_unprepare(host->clk);
 176         mutex_unlock(&host->lock);
 177 }
 178
 179 static int hisi_spi_nor_op_reg(struct spi_nor *nor,
 180                                 u8 opcode, int len, u8 optype)
 181 {
 182         struct hifmc_priv *priv = nor->priv;
 183         struct hifmc_host *host = priv->host;
 184         u32 reg;
 185
 186         reg = FMC_CMD_CMD1(opcode);
 187         writel(reg, host->regbase + FMC_CMD);
 188
 189         reg = FMC_DATA_NUM_CNT(len);
 190         writel(reg, host->regbase + FMC_DATA_NUM);
 191
 192         reg = OP_CFG_FM_CS(priv->chipselect);
 193         writel(reg, host->regbase + FMC_OP_CFG);
 194
 195         writel(0xff, host->regbase + FMC_INT_CLR);
 196         reg = FMC_OP_CMD1_EN | FMC_OP_REG_OP_START | optype;
 197         writel(reg, host->regbase + FMC_OP);
 198
 199         return hisi_spi_nor_wait_op_finish(host);
 200 }
 201
 202 static int hisi_spi_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
 203                 int len)
 204 {
 205         struct hifmc_priv *priv = nor->priv;
 206         struct hifmc_host *host = priv->host;
 207         int ret;
 208
 209         ret = hisi_spi_nor_op_reg(nor, opcode, len, FMC_OP_READ_DATA_EN);
 210         if (ret)
 211                 return ret;
 212
 213         memcpy_fromio(buf, host->iobase, len);
 214         return 0;
 215 }
 216
 217 static int hisi_spi_nor_write_reg(struct spi_nor *nor, u8 opcode,
 218                                 u8 *buf, int len)
 219 {
 220         struct hifmc_priv *priv = nor->priv;
 221         struct hifmc_host *host = priv->host;
 222
 223         if (len)
 224                 memcpy_toio(host->iobase, buf, len);
 225
 226         return hisi_spi_nor_op_reg(nor, opcode, len, FMC_OP_WRITE_DATA_EN);
 227 }
 228
 229 static int hisi_spi_nor_dma_transfer(struct spi_nor *nor, loff_t start_off,
 230                 dma_addr_t dma_buf, size_t len, u8 op_type)
 231 {
 232         struct hifmc_priv *priv = nor->priv;
 233         struct hifmc_host *host = priv->host;
 234         u8 if_type = 0;
 235         u32 reg;
 236
 237         reg = readl(host->regbase + FMC_CFG);
 238         reg &= ~(FMC_CFG_OP_MODE_MASK | SPI_NOR_ADDR_MODE_MASK);
 239         reg |= FMC_CFG_OP_MODE_NORMAL;
 240         reg |= (nor->addr_width == 4) ? SPI_NOR_ADDR_MODE_4BYTES
 241                 : SPI_NOR_ADDR_MODE_3BYTES;
 242         writel(reg, host->regbase + FMC_CFG);
 243
 244         writel(start_off, host->regbase + FMC_ADDRL);
 245         writel(dma_buf, host->regbase + FMC_DMA_SADDR_D0);
 246         writel(FMC_DMA_LEN_SET(len), host->regbase + FMC_DMA_LEN);
 247
 248         reg = OP_CFG_FM_CS(priv->chipselect);
 249         if (op_type == FMC_OP_READ)
 250                 if_type = hisi_spi_nor_get_if_type(nor->read_proto);
 251         else
 252                 if_type = hisi_spi_nor_get_if_type(nor->write_proto);
 253         reg |= OP_CFG_MEM_IF_TYPE(if_type);
 254         if (op_type == FMC_OP_READ)
 255                 reg |= OP_CFG_DUMMY_NUM(nor->read_dummy >> 3);
 256         writel(reg, host->regbase + FMC_OP_CFG);
 257
 258         writel(0xff, host->regbase + FMC_INT_CLR);
 259         reg = OP_CTRL_RW_OP(op_type) | OP_CTRL_DMA_OP_READY;
 260         reg |= (op_type == FMC_OP_READ)
 261                 ? OP_CTRL_RD_OPCODE(nor->read_opcode)
 262                 : OP_CTRL_WR_OPCODE(nor->program_opcode);
 263         writel(reg, host->regbase + FMC_OP_DMA);
 264
 265         return hisi_spi_nor_wait_op_finish(host);
 266 }
 267
 268 static ssize_t hisi_spi_nor_read(struct spi_nor *nor, loff_t from, size_t len,
 269                 u_char *read_buf)
 270 {
 271         struct hifmc_priv *priv = nor->priv;
 272         struct hifmc_host *host = priv->host;
 273         size_t offset;
 274         int ret;
 275
 276         for (offset = 0; offset < len; offset += HIFMC_DMA_MAX_LEN) {
 277                 size_t trans = min_t(size_t, HIFMC_DMA_MAX_LEN, len - offset);
 278
 279                 ret = hisi_spi_nor_dma_transfer(nor,
 280                         from + offset, host->dma_buffer, trans, FMC_OP_READ);
 281                 if (ret) {
 282                         dev_warn(nor->dev, "DMA read timeout\n");
 283                         return ret;
 284                 }
 285                 memcpy(read_buf + offset, host->buffer, trans);
 286         }
 287
 288         return len;
 289 }
 290
 291 static ssize_t hisi_spi_nor_write(struct spi_nor *nor, loff_t to,
 292                         size_t len, const u_char *write_buf)
 293 {
 294         struct hifmc_priv *priv = nor->priv;
 295         struct hifmc_host *host = priv->host;
 296         size_t offset;
 297         int ret;
 298
 299         for (offset = 0; offset < len; offset += HIFMC_DMA_MAX_LEN) {
 300                 size_t trans = min_t(size_t, HIFMC_DMA_MAX_LEN, len - offset);
 301
 302                 memcpy(host->buffer, write_buf + offset, trans);
 303                 ret = hisi_spi_nor_dma_transfer(nor,
 304                         to + offset, host->dma_buffer, trans, FMC_OP_WRITE);
 305                 if (ret) {
 306                         dev_warn(nor->dev, "DMA write timeout\n");
 307                         return ret;
 308                 }
 309         }
 310
 311         return len;
 312 }
 313
 314 /**
 315  * Get spi flash device information and register it as a mtd device.
 316  */
 317 static int hisi_spi_nor_register(struct device_node *np,
 318                                 struct hifmc_host *host)
 319 {
 320         const struct spi_nor_hwcaps hwcaps = {
 321                 .mask = SNOR_HWCAPS_READ |
 322                         SNOR_HWCAPS_READ_FAST |
 323                         SNOR_HWCAPS_READ_1_1_2 |
 324                         SNOR_HWCAPS_READ_1_1_4 |
 325                         SNOR_HWCAPS_PP,
 326         };
 327         struct device *dev = host->dev;
 328         struct spi_nor *nor;
 329         struct hifmc_priv *priv;
 330         struct mtd_info *mtd;
 331         int ret;
 332
 333         nor = devm_kzalloc(dev, sizeof(*nor), GFP_KERNEL);
 334         if (!nor)
 335                 return -ENOMEM;
 336
 337         nor->dev = dev;
 338         spi_nor_set_flash_node(nor, np);
 339
 340         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 341         if (!priv)
 342                 return -ENOMEM;
 343
 344         ret = of_property_read_u32(np, "reg", &priv->chipselect);
 345         if (ret) {
 346                 dev_err(dev, "There's no reg property for %pOF\n",
 347                         np);
 348                 return ret;
 349         }
 350
 351         ret = of_property_read_u32(np, "spi-max-frequency",
 352                         &priv->clkrate);
 353         if (ret) {
 354                 dev_err(dev, "There's no spi-max-frequency property for %pOF\n",
 355                         np);
 356                 return ret;
 357         }
 358         priv->host = host;
 359         nor->priv = priv;
 360
 361         nor->prepare = hisi_spi_nor_prep;
 362         nor->unprepare = hisi_spi_nor_unprep;
 363         nor->read_reg = hisi_spi_nor_read_reg;
 364         nor->write_reg = hisi_spi_nor_write_reg;
 365         nor->read = hisi_spi_nor_read;
 366         nor->write = hisi_spi_nor_write;
 367         nor->erase = NULL;
 368         ret = spi_nor_scan(nor, NULL, &hwcaps);
 369         if (ret)
 370                 return ret;
 371
 372         mtd = &nor->mtd;
 373         mtd->name = np->name;
 374         ret = mtd_device_register(mtd, NULL, 0);
 375         if (ret)
 376                 return ret;
 377
 378         host->nor[host->num_chip] = nor;
 379         host->num_chip++;
 380         return 0;
 381 }
 382
 383 static void hisi_spi_nor_unregister_all(struct hifmc_host *host)
 384 {
 385         int i;
 386
 387         for (i = 0; i < host->num_chip; i++)
 388                 mtd_device_unregister(&host->nor[i]->mtd);
 389 }
 390
 391 static int hisi_spi_nor_register_all(struct hifmc_host *host)
 392 {
 393         struct device *dev = host->dev;
 394         struct device_node *np;
 395         int ret;
 396
 397         for_each_available_child_of_node(dev->of_node, np) {
 398                 ret = hisi_spi_nor_register(np, host);
 399                 if (ret)
 400                         goto fail;
 401
 402                 if (host->num_chip == HIFMC_MAX_CHIP_NUM) {
 403                         dev_warn(dev, "Flash device number exceeds the maximum chipselect number\n");
 404                         break;
 405                 }
 406         }
 407
 408         return 0;
 409
 410 fail:
 411         hisi_spi_nor_unregister_all(host);
 412         return ret;
 413 }
 414
 415 static int hisi_spi_nor_probe(struct platform_device *pdev)
 416 {
 417         struct device *dev = &pdev->dev;
 418         struct resource *res;
 419         struct hifmc_host *host;
 420         int ret;
 421
 422         host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
 423         if (!host)
 424                 return -ENOMEM;
 425
 426         platform_set_drvdata(pdev, host);
 427         host->dev = dev;
 428
 429         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "control");
 430         host->regbase = devm_ioremap_resource(dev, res);
 431         if (IS_ERR(host->regbase))
 432                 return PTR_ERR(host->regbase);
 433
 434         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "memory");
 435         host->iobase = devm_ioremap_resource(dev, res);
 436         if (IS_ERR(host->iobase))
 437                 return PTR_ERR(host->iobase);
 438
 439         host->clk = devm_clk_get(dev, NULL);
 440         if (IS_ERR(host->clk))
 441                 return PTR_ERR(host->clk);
 442
 443         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 444         if (ret) {
 445                 dev_warn(dev, "Unable to set dma mask\n");
 446                 return ret;
 447         }
 448
 449         host->buffer = dmam_alloc_coherent(dev, HIFMC_DMA_MAX_LEN,
 450                         &host->dma_buffer, GFP_KERNEL);
 451         if (!host->buffer)
 452                 return -ENOMEM;
 453
 454         ret = clk_prepare_enable(host->clk);
 455         if (ret)
 456                 return ret;
 457
 458         mutex_init(&host->lock);
 459         hisi_spi_nor_init(host);
 460         ret = hisi_spi_nor_register_all(host);
 461         if (ret)
 462                 mutex_destroy(&host->lock);
 463
 464         clk_disable_unprepare(host->clk);
 465         return ret;
 466 }
 467
 468 static int hisi_spi_nor_remove(struct platform_device *pdev)
 469 {
 470         struct hifmc_host *host = platform_get_drvdata(pdev);
 471
 472         hisi_spi_nor_unregister_all(host);
 473         mutex_destroy(&host->lock);
 474         clk_disable_unprepare(host->clk);
 475         return 0;
 476 }
 477
 478 static const struct of_device_id hisi_spi_nor_dt_ids[] = {
 479         { .compatible = "hisilicon,fmc-spi-nor"},
 480         { /* sentinel */ }
 481 };
 482 MODULE_DEVICE_TABLE(of, hisi_spi_nor_dt_ids);
 483
 484 static struct platform_driver hisi_spi_nor_driver = {
 485         .driver = {
 486                 .name   = "hisi-sfc",
 487                 .of_match_table = hisi_spi_nor_dt_ids,
 488         },
 489         .probe  = hisi_spi_nor_probe,
 490         .remove = hisi_spi_nor_remove,
 491 };
 492 module_platform_driver(hisi_spi_nor_driver);
 493
 494 MODULE_LICENSE("GPL v2");
 495 MODULE_DESCRIPTION("HiSilicon SPI Nor Flash Controller Driver");