kernel/drivers/mtd/nand/brcmnand/brcmnand.c

   1 /*
   2  * Copyright © 2010-2015 Broadcom Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/version.h>
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/device.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/err.h>
  21 #include <linux/completion.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/dma-mapping.h>
  25 #include <linux/ioport.h>
  26 #include <linux/bug.h>
  27 #include <linux/kernel.h>
  28 #include <linux/bitops.h>
  29 #include <linux/mm.h>
  30 #include <linux/mtd/mtd.h>
  31 #include <linux/mtd/nand.h>
  32 #include <linux/mtd/partitions.h>
  33 #include <linux/of.h>
  34 #include <linux/of_mtd.h>
  35 #include <linux/of_platform.h>
  36 #include <linux/slab.h>
  37 #include <linux/list.h>
  38 #include <linux/log2.h>
  39
  40 #include "brcmnand.h"
  41
  42 /*
  43  * This flag controls if WP stays on between erase/write commands to mitigate
  44  * flash corruption due to power glitches. Values:
  45  * 0: NAND_WP is not used or not available
  46  * 1: NAND_WP is set by default, cleared for erase/write operations
  47  * 2: NAND_WP is always cleared
  48  */
  49 static int wp_on = 1;
  50 module_param(wp_on, int, 0444);
  51
  52 /***********************************************************************
  53  * Definitions
  54  ***********************************************************************/
  55
  56 #define DRV_NAME                        "brcmnand"
  57
  58 #define CMD_NULL                        0x00
  59 #define CMD_PAGE_READ                   0x01
  60 #define CMD_SPARE_AREA_READ             0x02
  61 #define CMD_STATUS_READ                 0x03
  62 #define CMD_PROGRAM_PAGE                0x04
  63 #define CMD_PROGRAM_SPARE_AREA          0x05
  64 #define CMD_COPY_BACK                   0x06
  65 #define CMD_DEVICE_ID_READ              0x07
  66 #define CMD_BLOCK_ERASE                 0x08
  67 #define CMD_FLASH_RESET                 0x09
  68 #define CMD_BLOCKS_LOCK                 0x0a
  69 #define CMD_BLOCKS_LOCK_DOWN            0x0b
  70 #define CMD_BLOCKS_UNLOCK               0x0c
  71 #define CMD_READ_BLOCKS_LOCK_STATUS     0x0d
  72 #define CMD_PARAMETER_READ              0x0e
  73 #define CMD_PARAMETER_CHANGE_COL        0x0f
  74 #define CMD_LOW_LEVEL_OP                0x10
  75
  76 struct brcm_nand_dma_desc {
  77         u32 next_desc;
  78         u32 next_desc_ext;
  79         u32 cmd_irq;
  80         u32 dram_addr;
  81         u32 dram_addr_ext;
  82         u32 tfr_len;
  83         u32 total_len;
  84         u32 flash_addr;
  85         u32 flash_addr_ext;
  86         u32 cs;
  87         u32 pad2[5];
  88         u32 status_valid;
  89 } __packed;
  90
  91 /* Bitfields for brcm_nand_dma_desc::status_valid */
  92 #define FLASH_DMA_ECC_ERROR     (1 << 8)
  93 #define FLASH_DMA_CORR_ERROR    (1 << 9)
  94
  95 /* 512B flash cache in the NAND controller HW */
  96 #define FC_SHIFT                9U
  97 #define FC_BYTES                512U
  98 #define FC_WORDS                (FC_BYTES >> 2)
  99
 100 #define BRCMNAND_MIN_PAGESIZE   512
 101 #define BRCMNAND_MIN_BLOCKSIZE  (8 * 1024)
 102 #define BRCMNAND_MIN_DEVSIZE    (4ULL * 1024 * 1024)
 103
 104 /* Controller feature flags */
 105 enum {
 106         BRCMNAND_HAS_1K_SECTORS                 = BIT(0),
 107         BRCMNAND_HAS_PREFETCH                   = BIT(1),
 108         BRCMNAND_HAS_CACHE_MODE                 = BIT(2),
 109         BRCMNAND_HAS_WP                         = BIT(3),
 110 };
 111
 112 struct brcmnand_controller {
 113         struct device           *dev;
 114         struct nand_hw_control  controller;
 115         void __iomem            *nand_base;
 116         void __iomem            *nand_fc; /* flash cache */
 117         void __iomem            *flash_dma_base;
 118         unsigned int            irq;
 119         unsigned int            dma_irq;
 120         int                     nand_version;
 121
 122         /* Some SoCs provide custom interrupt status register(s) */
 123         struct brcmnand_soc     *soc;
 124
 125         int                     cmd_pending;
 126         bool                    dma_pending;
 127         struct completion       done;
 128         struct completion       dma_done;
 129
 130         /* List of NAND hosts (one for each chip-select) */
 131         struct list_head host_list;
 132
 133         struct brcm_nand_dma_desc *dma_desc;
 134         dma_addr_t              dma_pa;
 135
 136         /* in-memory cache of the FLASH_CACHE, used only for some commands */
 137         u32                     flash_cache[FC_WORDS];
 138
 139         /* Controller revision details */
 140         const u16               *reg_offsets;
 141         unsigned int            reg_spacing; /* between CS1, CS2, ... regs */
 142         const u8                *cs_offsets; /* within each chip-select */
 143         const u8                *cs0_offsets; /* within CS0, if different */
 144         unsigned int            max_block_size;
 145         const unsigned int      *block_sizes;
 146         unsigned int            max_page_size;
 147         const unsigned int      *page_sizes;
 148         unsigned int            max_oob;
 149         u32                     features;
 150
 151         /* for low-power standby/resume only */
 152         u32                     nand_cs_nand_select;
 153         u32                     nand_cs_nand_xor;
 154         u32                     corr_stat_threshold;
 155         u32                     flash_dma_mode;
 156 };
 157
 158 struct brcmnand_cfg {
 159         u64                     device_size;
 160         unsigned int            block_size;
 161         unsigned int            page_size;
 162         unsigned int            spare_area_size;
 163         unsigned int            device_width;
 164         unsigned int            col_adr_bytes;
 165         unsigned int            blk_adr_bytes;
 166         unsigned int            ful_adr_bytes;
 167         unsigned int            sector_size_1k;
 168         unsigned int            ecc_level;
 169         /* use for low-power standby/resume only */
 170         u32                     acc_control;
 171         u32                     config;
 172         u32                     config_ext;
 173         u32                     timing_1;
 174         u32                     timing_2;
 175 };
 176
 177 struct brcmnand_host {
 178         struct list_head        node;
 179         struct device_node      *of_node;
 180
 181         struct nand_chip        chip;
 182         struct mtd_info         mtd;
 183         struct platform_device  *pdev;
 184         int                     cs;
 185
 186         unsigned int            last_cmd;
 187         unsigned int            last_byte;
 188         u64                     last_addr;
 189         struct brcmnand_cfg     hwcfg;
 190         struct brcmnand_controller *ctrl;
 191 };
 192
 193 enum brcmnand_reg {
 194         BRCMNAND_CMD_START = 0,
 195         BRCMNAND_CMD_EXT_ADDRESS,
 196         BRCMNAND_CMD_ADDRESS,
 197         BRCMNAND_INTFC_STATUS,
 198         BRCMNAND_CS_SELECT,
 199         BRCMNAND_CS_XOR,
 200         BRCMNAND_LL_OP,
 201         BRCMNAND_CS0_BASE,
 202         BRCMNAND_CS1_BASE,              /* CS1 regs, if non-contiguous */
 203         BRCMNAND_CORR_THRESHOLD,
 204         BRCMNAND_CORR_THRESHOLD_EXT,
 205         BRCMNAND_UNCORR_COUNT,
 206         BRCMNAND_CORR_COUNT,
 207         BRCMNAND_CORR_EXT_ADDR,
 208         BRCMNAND_CORR_ADDR,
 209         BRCMNAND_UNCORR_EXT_ADDR,
 210         BRCMNAND_UNCORR_ADDR,
 211         BRCMNAND_SEMAPHORE,
 212         BRCMNAND_ID,
 213         BRCMNAND_ID_EXT,
 214         BRCMNAND_LL_RDATA,
 215         BRCMNAND_OOB_READ_BASE,
 216         BRCMNAND_OOB_READ_10_BASE,      /* offset 0x10, if non-contiguous */
 217         BRCMNAND_OOB_WRITE_BASE,
 218         BRCMNAND_OOB_WRITE_10_BASE,     /* offset 0x10, if non-contiguous */
 219         BRCMNAND_FC_BASE,
 220 };
 221
 222 /* BRCMNAND v4.0 */
 223 static const u16 brcmnand_regs_v40[] = {
 224         [BRCMNAND_CMD_START]            =  0x04,
 225         [BRCMNAND_CMD_EXT_ADDRESS]      =  0x08,
 226         [BRCMNAND_CMD_ADDRESS]          =  0x0c,
 227         [BRCMNAND_INTFC_STATUS]         =  0x6c,
 228         [BRCMNAND_CS_SELECT]            =  0x14,
 229         [BRCMNAND_CS_XOR]               =  0x18,
 230         [BRCMNAND_LL_OP]                = 0x178,
 231         [BRCMNAND_CS0_BASE]             =  0x40,
 232         [BRCMNAND_CS1_BASE]             =  0xd0,
 233         [BRCMNAND_CORR_THRESHOLD]       =  0x84,
 234         [BRCMNAND_CORR_THRESHOLD_EXT]   =     0,
 235         [BRCMNAND_UNCORR_COUNT]         =     0,
 236         [BRCMNAND_CORR_COUNT]           =     0,
 237         [BRCMNAND_CORR_EXT_ADDR]        =  0x70,
 238         [BRCMNAND_CORR_ADDR]            =  0x74,
 239         [BRCMNAND_UNCORR_EXT_ADDR]      =  0x78,
 240         [BRCMNAND_UNCORR_ADDR]          =  0x7c,
 241         [BRCMNAND_SEMAPHORE]            =  0x58,
 242         [BRCMNAND_ID]                   =  0x60,
 243         [BRCMNAND_ID_EXT]               =  0x64,
 244         [BRCMNAND_LL_RDATA]             = 0x17c,
 245         [BRCMNAND_OOB_READ_BASE]        =  0x20,
 246         [BRCMNAND_OOB_READ_10_BASE]     = 0x130,
 247         [BRCMNAND_OOB_WRITE_BASE]       =  0x30,
 248         [BRCMNAND_OOB_WRITE_10_BASE]    =     0,
 249         [BRCMNAND_FC_BASE]              = 0x200,
 250 };
 251
 252 /* BRCMNAND v5.0 */
 253 static const u16 brcmnand_regs_v50[] = {
 254         [BRCMNAND_CMD_START]            =  0x04,
 255         [BRCMNAND_CMD_EXT_ADDRESS]      =  0x08,
 256         [BRCMNAND_CMD_ADDRESS]          =  0x0c,
 257         [BRCMNAND_INTFC_STATUS]         =  0x6c,
 258         [BRCMNAND_CS_SELECT]            =  0x14,
 259         [BRCMNAND_CS_XOR]               =  0x18,
 260         [BRCMNAND_LL_OP]                = 0x178,
 261         [BRCMNAND_CS0_BASE]             =  0x40,
 262         [BRCMNAND_CS1_BASE]             =  0xd0,
 263         [BRCMNAND_CORR_THRESHOLD]       =  0x84,
 264         [BRCMNAND_CORR_THRESHOLD_EXT]   =     0,
 265         [BRCMNAND_UNCORR_COUNT]         =     0,
 266         [BRCMNAND_CORR_COUNT]           =     0,
 267         [BRCMNAND_CORR_EXT_ADDR]        =  0x70,
 268         [BRCMNAND_CORR_ADDR]            =  0x74,
 269         [BRCMNAND_UNCORR_EXT_ADDR]      =  0x78,
 270         [BRCMNAND_UNCORR_ADDR]          =  0x7c,
 271         [BRCMNAND_SEMAPHORE]            =  0x58,
 272         [BRCMNAND_ID]                   =  0x60,
 273         [BRCMNAND_ID_EXT]               =  0x64,
 274         [BRCMNAND_LL_RDATA]             = 0x17c,
 275         [BRCMNAND_OOB_READ_BASE]        =  0x20,
 276         [BRCMNAND_OOB_READ_10_BASE]     = 0x130,
 277         [BRCMNAND_OOB_WRITE_BASE]       =  0x30,
 278         [BRCMNAND_OOB_WRITE_10_BASE]    = 0x140,
 279         [BRCMNAND_FC_BASE]              = 0x200,
 280 };
 281
 282 /* BRCMNAND v6.0 - v7.1 */
 283 static const u16 brcmnand_regs_v60[] = {
 284         [BRCMNAND_CMD_START]            =  0x04,
 285         [BRCMNAND_CMD_EXT_ADDRESS]      =  0x08,
 286         [BRCMNAND_CMD_ADDRESS]          =  0x0c,
 287         [BRCMNAND_INTFC_STATUS]         =  0x14,
 288         [BRCMNAND_CS_SELECT]            =  0x18,
 289         [BRCMNAND_CS_XOR]               =  0x1c,
 290         [BRCMNAND_LL_OP]                =  0x20,
 291         [BRCMNAND_CS0_BASE]             =  0x50,
 292         [BRCMNAND_CS1_BASE]             =     0,
 293         [BRCMNAND_CORR_THRESHOLD]       =  0xc0,
 294         [BRCMNAND_CORR_THRESHOLD_EXT]   =  0xc4,
 295         [BRCMNAND_UNCORR_COUNT]         =  0xfc,
 296         [BRCMNAND_CORR_COUNT]           = 0x100,
 297         [BRCMNAND_CORR_EXT_ADDR]        = 0x10c,
 298         [BRCMNAND_CORR_ADDR]            = 0x110,
 299         [BRCMNAND_UNCORR_EXT_ADDR]      = 0x114,
 300         [BRCMNAND_UNCORR_ADDR]          = 0x118,
 301         [BRCMNAND_SEMAPHORE]            = 0x150,
 302         [BRCMNAND_ID]                   = 0x194,
 303         [BRCMNAND_ID_EXT]               = 0x198,
 304         [BRCMNAND_LL_RDATA]             = 0x19c,
 305         [BRCMNAND_OOB_READ_BASE]        = 0x200,
 306         [BRCMNAND_OOB_READ_10_BASE]     =     0,
 307         [BRCMNAND_OOB_WRITE_BASE]       = 0x280,
 308         [BRCMNAND_OOB_WRITE_10_BASE]    =     0,
 309         [BRCMNAND_FC_BASE]              = 0x400,
 310 };
 311
 312 enum brcmnand_cs_reg {
 313         BRCMNAND_CS_CFG_EXT = 0,
 314         BRCMNAND_CS_CFG,
 315         BRCMNAND_CS_ACC_CONTROL,
 316         BRCMNAND_CS_TIMING1,
 317         BRCMNAND_CS_TIMING2,
 318 };
 319
 320 /* Per chip-select offsets for v7.1 */
 321 static const u8 brcmnand_cs_offsets_v71[] = {
 322         [BRCMNAND_CS_ACC_CONTROL]       = 0x00,
 323         [BRCMNAND_CS_CFG_EXT]           = 0x04,
 324         [BRCMNAND_CS_CFG]               = 0x08,
 325         [BRCMNAND_CS_TIMING1]           = 0x0c,
 326         [BRCMNAND_CS_TIMING2]           = 0x10,
 327 };
 328
 329 /* Per chip-select offsets for pre v7.1, except CS0 on <= v5.0 */
 330 static const u8 brcmnand_cs_offsets[] = {
 331         [BRCMNAND_CS_ACC_CONTROL]       = 0x00,
 332         [BRCMNAND_CS_CFG_EXT]           = 0x04,
 333         [BRCMNAND_CS_CFG]               = 0x04,
 334         [BRCMNAND_CS_TIMING1]           = 0x08,
 335         [BRCMNAND_CS_TIMING2]           = 0x0c,
 336 };
 337
 338 /* Per chip-select offset for <= v5.0 on CS0 only */
 339 static const u8 brcmnand_cs_offsets_cs0[] = {
 340         [BRCMNAND_CS_ACC_CONTROL]       = 0x00,
 341         [BRCMNAND_CS_CFG_EXT]           = 0x08,
 342         [BRCMNAND_CS_CFG]               = 0x08,
 343         [BRCMNAND_CS_TIMING1]           = 0x10,
 344         [BRCMNAND_CS_TIMING2]           = 0x14,
 345 };
 346
 347 /*
 348  * Bitfields for the CFG and CFG_EXT registers. Pre-v7.1 controllers only had
 349  * one config register, but once the bitfields overflowed, newer controllers
 350  * (v7.1 and newer) added a CFG_EXT register and shuffled a few fields around.
 351  */
 352 enum {
 353         CFG_BLK_ADR_BYTES_SHIFT         = 8,
 354         CFG_COL_ADR_BYTES_SHIFT         = 12,
 355         CFG_FUL_ADR_BYTES_SHIFT         = 16,
 356         CFG_BUS_WIDTH_SHIFT             = 23,
 357         CFG_BUS_WIDTH                   = BIT(CFG_BUS_WIDTH_SHIFT),
 358         CFG_DEVICE_SIZE_SHIFT           = 24,
 359
 360         /* Only for pre-v7.1 (with no CFG_EXT register) */
 361         CFG_PAGE_SIZE_SHIFT             = 20,
 362         CFG_BLK_SIZE_SHIFT              = 28,
 363
 364         /* Only for v7.1+ (with CFG_EXT register) */
 365         CFG_EXT_PAGE_SIZE_SHIFT         = 0,
 366         CFG_EXT_BLK_SIZE_SHIFT          = 4,
 367 };
 368
 369 /* BRCMNAND_INTFC_STATUS */
 370 enum {
 371         INTFC_FLASH_STATUS              = GENMASK(7, 0),
 372
 373         INTFC_ERASED                    = BIT(27),
 374         INTFC_OOB_VALID                 = BIT(28),
 375         INTFC_CACHE_VALID               = BIT(29),
 376         INTFC_FLASH_READY               = BIT(30),
 377         INTFC_CTLR_READY                = BIT(31),
 378 };
 379
 380 static inline u32 nand_readreg(struct brcmnand_controller *ctrl, u32 offs)
 381 {
 382         return brcmnand_readl(ctrl->nand_base + offs);
 383 }
 384
 385 static inline void nand_writereg(struct brcmnand_controller *ctrl, u32 offs,
 386                                  u32 val)
 387 {
 388         brcmnand_writel(val, ctrl->nand_base + offs);
 389 }
 390
 391 static int brcmnand_revision_init(struct brcmnand_controller *ctrl)
 392 {
 393         static const unsigned int block_sizes_v6[] = { 8, 16, 128, 256, 512, 1024, 2048, 0 };
 394         static const unsigned int block_sizes_v4[] = { 16, 128, 8, 512, 256, 1024, 2048, 0 };
 395         static const unsigned int page_sizes[] = { 512, 2048, 4096, 8192, 0 };
 396
 397         ctrl->nand_version = nand_readreg(ctrl, 0) & 0xffff;
 398
 399         /* Only support v4.0+? */
 400         if (ctrl->nand_version < 0x0400) {
 401                 dev_err(ctrl->dev, "version %#x not supported\n",
 402                         ctrl->nand_version);
 403                 return -ENODEV;
 404         }
 405
 406         /* Register offsets */
 407         if (ctrl->nand_version >= 0x0600)
 408                 ctrl->reg_offsets = brcmnand_regs_v60;
 409         else if (ctrl->nand_version >= 0x0500)
 410                 ctrl->reg_offsets = brcmnand_regs_v50;
 411         else if (ctrl->nand_version >= 0x0400)
 412                 ctrl->reg_offsets = brcmnand_regs_v40;
 413
 414         /* Chip-select stride */
 415         if (ctrl->nand_version >= 0x0701)
 416                 ctrl->reg_spacing = 0x14;
 417         else
 418                 ctrl->reg_spacing = 0x10;
 419
 420         /* Per chip-select registers */
 421         if (ctrl->nand_version >= 0x0701) {
 422                 ctrl->cs_offsets = brcmnand_cs_offsets_v71;
 423         } else {
 424                 ctrl->cs_offsets = brcmnand_cs_offsets;
 425
 426                 /* v5.0 and earlier has a different CS0 offset layout */
 427                 if (ctrl->nand_version <= 0x0500)
 428                         ctrl->cs0_offsets = brcmnand_cs_offsets_cs0;
 429         }
 430
 431         /* Page / block sizes */
 432         if (ctrl->nand_version >= 0x0701) {
 433                 /* >= v7.1 use nice power-of-2 values! */
 434                 ctrl->max_page_size = 16 * 1024;
 435                 ctrl->max_block_size = 2 * 1024 * 1024;
 436         } else {
 437                 ctrl->page_sizes = page_sizes;
 438                 if (ctrl->nand_version >= 0x0600)
 439                         ctrl->block_sizes = block_sizes_v6;
 440                 else
 441                         ctrl->block_sizes = block_sizes_v4;
 442
 443                 if (ctrl->nand_version < 0x0400) {
 444                         ctrl->max_page_size = 4096;
 445                         ctrl->max_block_size = 512 * 1024;
 446                 }
 447         }
 448
 449         /* Maximum spare area sector size (per 512B) */
 450         if (ctrl->nand_version >= 0x0600)
 451                 ctrl->max_oob = 64;
 452         else if (ctrl->nand_version >= 0x0500)
 453                 ctrl->max_oob = 32;
 454         else
 455                 ctrl->max_oob = 16;
 456
 457         /* v6.0 and newer (except v6.1) have prefetch support */
 458         if (ctrl->nand_version >= 0x0600 && ctrl->nand_version != 0x0601)
 459                 ctrl->features |= BRCMNAND_HAS_PREFETCH;
 460
 461         /*
 462          * v6.x has cache mode, but it's implemented differently. Ignore it for
 463          * now.
 464          */
 465         if (ctrl->nand_version >= 0x0700)
 466                 ctrl->features |= BRCMNAND_HAS_CACHE_MODE;
 467
 468         if (ctrl->nand_version >= 0x0500)
 469                 ctrl->features |= BRCMNAND_HAS_1K_SECTORS;
 470
 471         if (ctrl->nand_version >= 0x0700)
 472                 ctrl->features |= BRCMNAND_HAS_WP;
 473         else if (of_property_read_bool(ctrl->dev->of_node, "brcm,nand-has-wp"))
 474                 ctrl->features |= BRCMNAND_HAS_WP;
 475
 476         return 0;
 477 }
 478
 479 static inline u32 brcmnand_read_reg(struct brcmnand_controller *ctrl,
 480                 enum brcmnand_reg reg)
 481 {
 482         u16 offs = ctrl->reg_offsets[reg];
 483
 484         if (offs)
 485                 return nand_readreg(ctrl, offs);
 486         else
 487                 return 0;
 488 }
 489
 490 static inline void brcmnand_write_reg(struct brcmnand_controller *ctrl,
 491                                       enum brcmnand_reg reg, u32 val)
 492 {
 493         u16 offs = ctrl->reg_offsets[reg];
 494
 495         if (offs)
 496                 nand_writereg(ctrl, offs, val);
 497 }
 498
 499 static inline void brcmnand_rmw_reg(struct brcmnand_controller *ctrl,
 500                                     enum brcmnand_reg reg, u32 mask, unsigned
 501                                     int shift, u32 val)
 502 {
 503         u32 tmp = brcmnand_read_reg(ctrl, reg);
 504
 505         tmp &= ~mask;
 506         tmp |= val << shift;
 507         brcmnand_write_reg(ctrl, reg, tmp);
 508 }
 509
 510 static inline u32 brcmnand_read_fc(struct brcmnand_controller *ctrl, int word)
 511 {
 512         return __raw_readl(ctrl->nand_fc + word * 4);
 513 }
 514
 515 static inline void brcmnand_write_fc(struct brcmnand_controller *ctrl,
 516                                      int word, u32 val)
 517 {
 518         __raw_writel(val, ctrl->nand_fc + word * 4);
 519 }
 520
 521 static inline u16 brcmnand_cs_offset(struct brcmnand_controller *ctrl, int cs,
 522                                      enum brcmnand_cs_reg reg)
 523 {
 524         u16 offs_cs0 = ctrl->reg_offsets[BRCMNAND_CS0_BASE];
 525         u16 offs_cs1 = ctrl->reg_offsets[BRCMNAND_CS1_BASE];
 526         u8 cs_offs;
 527
 528         if (cs == 0 && ctrl->cs0_offsets)
 529                 cs_offs = ctrl->cs0_offsets[reg];
 530         else
 531                 cs_offs = ctrl->cs_offsets[reg];
 532
 533         if (cs && offs_cs1)
 534                 return offs_cs1 + (cs - 1) * ctrl->reg_spacing + cs_offs;
 535
 536         return offs_cs0 + cs * ctrl->reg_spacing + cs_offs;
 537 }
 538
 539 static inline u32 brcmnand_count_corrected(struct brcmnand_controller *ctrl)
 540 {
 541         if (ctrl->nand_version < 0x0600)
 542                 return 1;
 543         return brcmnand_read_reg(ctrl, BRCMNAND_CORR_COUNT);
 544 }
 545
 546 static void brcmnand_wr_corr_thresh(struct brcmnand_host *host, u8 val)
 547 {
 548         struct brcmnand_controller *ctrl = host->ctrl;
 549         unsigned int shift = 0, bits;
 550         enum brcmnand_reg reg = BRCMNAND_CORR_THRESHOLD;
 551         int cs = host->cs;
 552
 553         if (ctrl->nand_version >= 0x0600)
 554                 bits = 6;
 555         else if (ctrl->nand_version >= 0x0500)
 556                 bits = 5;
 557         else
 558                 bits = 4;
 559
 560         if (ctrl->nand_version >= 0x0600) {
 561                 if (cs >= 5)
 562                         reg = BRCMNAND_CORR_THRESHOLD_EXT;
 563                 shift = (cs % 5) * bits;
 564         }
 565         brcmnand_rmw_reg(ctrl, reg, (bits - 1) << shift, shift, val);
 566 }
 567
 568 static inline int brcmnand_cmd_shift(struct brcmnand_controller *ctrl)
 569 {
 570         if (ctrl->nand_version < 0x0700)
 571                 return 24;
 572         return 0;
 573 }
 574
 575 /***********************************************************************
 576  * NAND ACC CONTROL bitfield
 577  *
 578  * Some bits have remained constant throughout hardware revision, while
 579  * others have shifted around.
 580  ***********************************************************************/
 581
 582 /* Constant for all versions (where supported) */
 583 enum {
 584         /* See BRCMNAND_HAS_CACHE_MODE */
 585         ACC_CONTROL_CACHE_MODE                          = BIT(22),
 586
 587         /* See BRCMNAND_HAS_PREFETCH */
 588         ACC_CONTROL_PREFETCH                            = BIT(23),
 589
 590         ACC_CONTROL_PAGE_HIT                            = BIT(24),
 591         ACC_CONTROL_WR_PREEMPT                          = BIT(25),
 592         ACC_CONTROL_PARTIAL_PAGE                        = BIT(26),
 593         ACC_CONTROL_RD_ERASED                           = BIT(27),
 594         ACC_CONTROL_FAST_PGM_RDIN                       = BIT(28),
 595         ACC_CONTROL_WR_ECC                              = BIT(30),
 596         ACC_CONTROL_RD_ECC                              = BIT(31),
 597 };
 598
 599 static inline u32 brcmnand_spare_area_mask(struct brcmnand_controller *ctrl)
 600 {
 601         if (ctrl->nand_version >= 0x0600)
 602                 return GENMASK(6, 0);
 603         else
 604                 return GENMASK(5, 0);
 605 }
 606
 607 #define NAND_ACC_CONTROL_ECC_SHIFT      16
 608
 609 static inline u32 brcmnand_ecc_level_mask(struct brcmnand_controller *ctrl)
 610 {
 611         u32 mask = (ctrl->nand_version >= 0x0600) ? 0x1f : 0x0f;
 612
 613         return mask << NAND_ACC_CONTROL_ECC_SHIFT;
 614 }
 615
 616 static void brcmnand_set_ecc_enabled(struct brcmnand_host *host, int en)
 617 {
 618         struct brcmnand_controller *ctrl = host->ctrl;
 619         u16 offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_ACC_CONTROL);
 620         u32 acc_control = nand_readreg(ctrl, offs);
 621         u32 ecc_flags = ACC_CONTROL_WR_ECC | ACC_CONTROL_RD_ECC;
 622
 623         if (en) {
 624                 acc_control |= ecc_flags; /* enable RD/WR ECC */
 625                 acc_control |= host->hwcfg.ecc_level
 626                                << NAND_ACC_CONTROL_ECC_SHIFT;
 627         } else {
 628                 acc_control &= ~ecc_flags; /* disable RD/WR ECC */
 629                 acc_control &= ~brcmnand_ecc_level_mask(ctrl);
 630         }
 631
 632         nand_writereg(ctrl, offs, acc_control);
 633 }
 634
 635 static inline int brcmnand_sector_1k_shift(struct brcmnand_controller *ctrl)
 636 {
 637         if (ctrl->nand_version >= 0x0600)
 638                 return 7;
 639         else if (ctrl->nand_version >= 0x0500)
 640                 return 6;
 641         else
 642                 return -1;
 643 }
 644
 645 static int brcmnand_get_sector_size_1k(struct brcmnand_host *host)
 646 {
 647         struct brcmnand_controller *ctrl = host->ctrl;
 648         int shift = brcmnand_sector_1k_shift(ctrl);
 649         u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs,
 650                                                   BRCMNAND_CS_ACC_CONTROL);
 651
 652         if (shift < 0)
 653                 return 0;
 654
 655         return (nand_readreg(ctrl, acc_control_offs) >> shift) & 0x1;
 656 }
 657
 658 static void brcmnand_set_sector_size_1k(struct brcmnand_host *host, int val)
 659 {
 660         struct brcmnand_controller *ctrl = host->ctrl;
 661         int shift = brcmnand_sector_1k_shift(ctrl);
 662         u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs,
 663                                                   BRCMNAND_CS_ACC_CONTROL);
 664         u32 tmp;
 665
 666         if (shift < 0)
 667                 return;
 668
 669         tmp = nand_readreg(ctrl, acc_control_offs);
 670         tmp &= ~(1 << shift);
 671         tmp |= (!!val) << shift;
 672         nand_writereg(ctrl, acc_control_offs, tmp);
 673 }
 674
 675 /***********************************************************************
 676  * CS_NAND_SELECT
 677  ***********************************************************************/
 678
 679 enum {
 680         CS_SELECT_NAND_WP                       = BIT(29),
 681         CS_SELECT_AUTO_DEVICE_ID_CFG            = BIT(30),
 682 };
 683
 684 static inline void brcmnand_set_wp(struct brcmnand_controller *ctrl, bool en)
 685 {
 686         u32 val = en ? CS_SELECT_NAND_WP : 0;
 687
 688         brcmnand_rmw_reg(ctrl, BRCMNAND_CS_SELECT, CS_SELECT_NAND_WP, 0, val);
 689 }
 690
 691 /***********************************************************************
 692  * Flash DMA
 693  ***********************************************************************/
 694
 695 enum flash_dma_reg {
 696         FLASH_DMA_REVISION              = 0x00,
 697         FLASH_DMA_FIRST_DESC            = 0x04,
 698         FLASH_DMA_FIRST_DESC_EXT        = 0x08,
 699         FLASH_DMA_CTRL                  = 0x0c,
 700         FLASH_DMA_MODE                  = 0x10,
 701         FLASH_DMA_STATUS                = 0x14,
 702         FLASH_DMA_INTERRUPT_DESC        = 0x18,
 703         FLASH_DMA_INTERRUPT_DESC_EXT    = 0x1c,
 704         FLASH_DMA_ERROR_STATUS          = 0x20,
 705         FLASH_DMA_CURRENT_DESC          = 0x24,
 706         FLASH_DMA_CURRENT_DESC_EXT      = 0x28,
 707 };
 708
 709 static inline bool has_flash_dma(struct brcmnand_controller *ctrl)
 710 {
 711         return ctrl->flash_dma_base;
 712 }
 713
 714 static inline bool flash_dma_buf_ok(const void *buf)
 715 {
 716         return buf && !is_vmalloc_addr(buf) &&
 717                 likely(IS_ALIGNED((uintptr_t)buf, 4));
 718 }
 719
 720 static inline void flash_dma_writel(struct brcmnand_controller *ctrl, u8 offs,
 721                                     u32 val)
 722 {
 723         brcmnand_writel(val, ctrl->flash_dma_base + offs);
 724 }
 725
 726 static inline u32 flash_dma_readl(struct brcmnand_controller *ctrl, u8 offs)
 727 {
 728         return brcmnand_readl(ctrl->flash_dma_base + offs);
 729 }
 730
 731 /* Low-level operation types: command, address, write, or read */
 732 enum brcmnand_llop_type {
 733         LL_OP_CMD,
 734         LL_OP_ADDR,
 735         LL_OP_WR,
 736         LL_OP_RD,
 737 };
 738
 739 /***********************************************************************
 740  * Internal support functions
 741  ***********************************************************************/
 742
 743 static inline bool is_hamming_ecc(struct brcmnand_cfg *cfg)
 744 {
 745         return cfg->sector_size_1k == 0 && cfg->spare_area_size == 16 &&
 746                 cfg->ecc_level == 15;
 747 }
 748
 749 /*
 750  * Returns a nand_ecclayout strucutre for the given layout/configuration.
 751  * Returns NULL on failure.
 752  */
 753 static struct nand_ecclayout *brcmnand_create_layout(int ecc_level,
 754                                                      struct brcmnand_host *host)
 755 {
 756         struct brcmnand_cfg *cfg = &host->hwcfg;
 757         int i, j;
 758         struct nand_ecclayout *layout;
 759         int req;
 760         int sectors;
 761         int sas;
 762         int idx1, idx2;
 763
 764         layout = devm_kzalloc(&host->pdev->dev, sizeof(*layout), GFP_KERNEL);
 765         if (!layout)
 766                 return NULL;
 767
 768         sectors = cfg->page_size / (512 << cfg->sector_size_1k);
 769         sas = cfg->spare_area_size << cfg->sector_size_1k;
 770
 771         /* Hamming */
 772         if (is_hamming_ecc(cfg)) {
 773                 for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {
 774                         /* First sector of each page may have BBI */
 775                         if (i == 0) {
 776                                 layout->oobfree[idx2].offset = i * sas + 1;
 777                                 /* Small-page NAND use byte 6 for BBI */
 778                                 if (cfg->page_size == 512)
 779                                         layout->oobfree[idx2].offset--;
 780                                 layout->oobfree[idx2].length = 5;
 781                         } else {
 782                                 layout->oobfree[idx2].offset = i * sas;
 783                                 layout->oobfree[idx2].length = 6;
 784                         }
 785                         idx2++;
 786                         layout->eccpos[idx1++] = i * sas + 6;
 787                         layout->eccpos[idx1++] = i * sas + 7;
 788                         layout->eccpos[idx1++] = i * sas + 8;
 789                         layout->oobfree[idx2].offset = i * sas + 9;
 790                         layout->oobfree[idx2].length = 7;
 791                         idx2++;
 792                         /* Leave zero-terminated entry for OOBFREE */
 793                         if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||
 794                                     idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
 795                                 break;
 796                 }
 797                 goto out;
 798         }
 799
 800         /*
 801          * CONTROLLER_VERSION:
 802          *   < v5.0: ECC_REQ = ceil(BCH_T * 13/8)
 803          *  >= v5.0: ECC_REQ = ceil(BCH_T * 14/8)
 804          * But we will just be conservative.
 805          */
 806         req = DIV_ROUND_UP(ecc_level * 14, 8);
 807         if (req >= sas) {
 808                 dev_err(&host->pdev->dev,
 809                         "error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n",
 810                         req, sas);
 811                 return NULL;
 812         }
 813
 814         layout->eccbytes = req * sectors;
 815         for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {
 816                 for (j = sas - req; j < sas && idx1 <
 817                                 MTD_MAX_ECCPOS_ENTRIES_LARGE; j++, idx1++)
 818                         layout->eccpos[idx1] = i * sas + j;
 819
 820                 /* First sector of each page may have BBI */
 821                 if (i == 0) {
 822                         if (cfg->page_size == 512 && (sas - req >= 6)) {
 823                                 /* Small-page NAND use byte 6 for BBI */
 824                                 layout->oobfree[idx2].offset = 0;
 825                                 layout->oobfree[idx2].length = 5;
 826                                 idx2++;
 827                                 if (sas - req > 6) {
 828                                         layout->oobfree[idx2].offset = 6;
 829                                         layout->oobfree[idx2].length =
 830                                                 sas - req - 6;
 831                                         idx2++;
 832                                 }
 833                         } else if (sas > req + 1) {
 834                                 layout->oobfree[idx2].offset = i * sas + 1;
 835                                 layout->oobfree[idx2].length = sas - req - 1;
 836                                 idx2++;
 837                         }
 838                 } else if (sas > req) {
 839                         layout->oobfree[idx2].offset = i * sas;
 840                         layout->oobfree[idx2].length = sas - req;
 841                         idx2++;
 842                 }
 843                 /* Leave zero-terminated entry for OOBFREE */
 844                 if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||
 845                                 idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
 846                         break;
 847         }
 848 out:
 849         /* Sum available OOB */
 850         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES_LARGE; i++)
 851                 layout->oobavail += layout->oobfree[i].length;
 852         return layout;
 853 }
 854
 855 static struct nand_ecclayout *brcmstb_choose_ecc_layout(
 856                 struct brcmnand_host *host)
 857 {
 858         struct nand_ecclayout *layout;
 859         struct brcmnand_cfg *p = &host->hwcfg;
 860         unsigned int ecc_level = p->ecc_level;
 861
 862         if (p->sector_size_1k)
 863                 ecc_level <<= 1;
 864
 865         layout = brcmnand_create_layout(ecc_level, host);
 866         if (!layout) {
 867                 dev_err(&host->pdev->dev,
 868                                 "no proper ecc_layout for this NAND cfg\n");
 869                 return NULL;
 870         }
 871
 872         return layout;
 873 }
 874
 875 static void brcmnand_wp(struct mtd_info *mtd, int wp)
 876 {
 877         struct nand_chip *chip = mtd->priv;
 878         struct brcmnand_host *host = chip->priv;
 879         struct brcmnand_controller *ctrl = host->ctrl;
 880
 881         if ((ctrl->features & BRCMNAND_HAS_WP) && wp_on == 1) {
 882                 static int old_wp = -1;
 883
 884                 if (old_wp != wp) {
 885                         dev_dbg(ctrl->dev, "WP %s\n", wp ? "on" : "off");
 886                         old_wp = wp;
 887                 }
 888                 brcmnand_set_wp(ctrl, wp);
 889         }
 890 }
 891
 892 /* Helper functions for reading and writing OOB registers */
 893 static inline u8 oob_reg_read(struct brcmnand_controller *ctrl, u32 offs)
 894 {
 895         u16 offset0, offset10, reg_offs;
 896
 897         offset0 = ctrl->reg_offsets[BRCMNAND_OOB_READ_BASE];
 898         offset10 = ctrl->reg_offsets[BRCMNAND_OOB_READ_10_BASE];
 899
 900         if (offs >= ctrl->max_oob)
 901                 return 0x77;
 902
 903         if (offs >= 16 && offset10)
 904                 reg_offs = offset10 + ((offs - 0x10) & ~0x03);
 905         else
 906                 reg_offs = offset0 + (offs & ~0x03);
 907
 908         return nand_readreg(ctrl, reg_offs) >> (24 - ((offs & 0x03) << 3));
 909 }
 910
 911 static inline void oob_reg_write(struct brcmnand_controller *ctrl, u32 offs,
 912                                  u32 data)
 913 {
 914         u16 offset0, offset10, reg_offs;
 915
 916         offset0 = ctrl->reg_offsets[BRCMNAND_OOB_WRITE_BASE];
 917         offset10 = ctrl->reg_offsets[BRCMNAND_OOB_WRITE_10_BASE];
 918
 919         if (offs >= ctrl->max_oob)
 920                 return;
 921
 922         if (offs >= 16 && offset10)
 923                 reg_offs = offset10 + ((offs - 0x10) & ~0x03);
 924         else
 925                 reg_offs = offset0 + (offs & ~0x03);
 926
 927         nand_writereg(ctrl, reg_offs, data);
 928 }
 929
 930 /*
 931  * read_oob_from_regs - read data from OOB registers
 932  * @ctrl: NAND controller
 933  * @i: sub-page sector index
 934  * @oob: buffer to read to
 935  * @sas: spare area sector size (i.e., OOB size per FLASH_CACHE)
 936  * @sector_1k: 1 for 1KiB sectors, 0 for 512B, other values are illegal
 937  */
 938 static int read_oob_from_regs(struct brcmnand_controller *ctrl, int i, u8 *oob,
 939                               int sas, int sector_1k)
 940 {
 941         int tbytes = sas << sector_1k;
 942         int j;
 943
 944         /* Adjust OOB values for 1K sector size */
 945         if (sector_1k && (i & 0x01))
 946                 tbytes = max(0, tbytes - (int)ctrl->max_oob);
 947         tbytes = min_t(int, tbytes, ctrl->max_oob);
 948
 949         for (j = 0; j < tbytes; j++)
 950                 oob[j] = oob_reg_read(ctrl, j);
 951         return tbytes;
 952 }
 953
 954 /*
 955  * write_oob_to_regs - write data to OOB registers
 956  * @i: sub-page sector index
 957  * @oob: buffer to write from
 958  * @sas: spare area sector size (i.e., OOB size per FLASH_CACHE)
 959  * @sector_1k: 1 for 1KiB sectors, 0 for 512B, other values are illegal
 960  */
 961 static int write_oob_to_regs(struct brcmnand_controller *ctrl, int i,
 962                              const u8 *oob, int sas, int sector_1k)
 963 {
 964         int tbytes = sas << sector_1k;
 965         int j;
 966
 967         /* Adjust OOB values for 1K sector size */
 968         if (sector_1k && (i & 0x01))
 969                 tbytes = max(0, tbytes - (int)ctrl->max_oob);
 970         tbytes = min_t(int, tbytes, ctrl->max_oob);
 971
 972         for (j = 0; j < tbytes; j += 4)
 973                 oob_reg_write(ctrl, j,
 974                                 (oob[j + 0] << 24) |
 975                                 (oob[j + 1] << 16) |
 976                                 (oob[j + 2] <<  8) |
 977                                 (oob[j + 3] <<  0));
 978         return tbytes;
 979 }
 980
 981 static irqreturn_t brcmnand_ctlrdy_irq(int irq, void *data)
 982 {
 983         struct brcmnand_controller *ctrl = data;
 984
 985         /* Discard all NAND_CTLRDY interrupts during DMA */
 986         if (ctrl->dma_pending)
 987                 return IRQ_HANDLED;
 988
 989         complete(&ctrl->done);
 990         return IRQ_HANDLED;
 991 }
 992
 993 /* Handle SoC-specific interrupt hardware */
 994 static irqreturn_t brcmnand_irq(int irq, void *data)
 995 {
 996         struct brcmnand_controller *ctrl = data;
 997
 998         if (ctrl->soc->ctlrdy_ack(ctrl->soc))
 999                 return brcmnand_ctlrdy_irq(irq, data);
1000
1001         return IRQ_NONE;
1002 }
1003
1004 static irqreturn_t brcmnand_dma_irq(int irq, void *data)
1005 {
1006         struct brcmnand_controller *ctrl = data;
1007
1008         complete(&ctrl->dma_done);
1009
1010         return IRQ_HANDLED;
1011 }
1012
1013 static void brcmnand_send_cmd(struct brcmnand_host *host, int cmd)
1014 {
1015         struct brcmnand_controller *ctrl = host->ctrl;
1016         u32 intfc;
1017
1018         dev_dbg(ctrl->dev, "send native cmd %d addr_lo 0x%x\n", cmd,
1019                 brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS));
1020         BUG_ON(ctrl->cmd_pending != 0);
1021         ctrl->cmd_pending = cmd;
1022
1023         intfc = brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS);
1024         BUG_ON(!(intfc & INTFC_CTLR_READY));
1025
1026         mb(); /* flush previous writes */
1027         brcmnand_write_reg(ctrl, BRCMNAND_CMD_START,
1028                            cmd << brcmnand_cmd_shift(ctrl));
1029 }
1030
1031 /***********************************************************************
1032  * NAND MTD API: read/program/erase
1033  ***********************************************************************/
1034
1035 static void brcmnand_cmd_ctrl(struct mtd_info *mtd, int dat,
1036         unsigned int ctrl)
1037 {
1038         /* intentionally left blank */
1039 }
1040
1041 static int brcmnand_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
1042 {
1043         struct nand_chip *chip = mtd->priv;
1044         struct brcmnand_host *host = chip->priv;
1045         struct brcmnand_controller *ctrl = host->ctrl;
1046         unsigned long timeo = msecs_to_jiffies(100);
1047
1048         dev_dbg(ctrl->dev, "wait on native cmd %d\n", ctrl->cmd_pending);
1049         if (ctrl->cmd_pending &&
1050                         wait_for_completion_timeout(&ctrl->done, timeo) <= 0) {
1051                 u32 cmd = brcmnand_read_reg(ctrl, BRCMNAND_CMD_START)
1052                                         >> brcmnand_cmd_shift(ctrl);
1053
1054                 dev_err_ratelimited(ctrl->dev,
1055                         "timeout waiting for command %#02x\n", cmd);
1056                 dev_err_ratelimited(ctrl->dev, "intfc status %08x\n",
1057                         brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS));
1058         }
1059         ctrl->cmd_pending = 0;
1060         return brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS) &
1061                                  INTFC_FLASH_STATUS;
1062 }
1063
1064 enum {
1065         LLOP_RE                         = BIT(16),
1066         LLOP_WE                         = BIT(17),
1067         LLOP_ALE                        = BIT(18),
1068         LLOP_CLE                        = BIT(19),
1069         LLOP_RETURN_IDLE                = BIT(31),
1070
1071         LLOP_DATA_MASK                  = GENMASK(15, 0),
1072 };
1073
1074 static int brcmnand_low_level_op(struct brcmnand_host *host,
1075                                  enum brcmnand_llop_type type, u32 data,
1076                                  bool last_op)
1077 {
1078         struct mtd_info *mtd = &host->mtd;
1079         struct nand_chip *chip = &host->chip;
1080         struct brcmnand_controller *ctrl = host->ctrl;
1081         u32 tmp;
1082
1083         tmp = data & LLOP_DATA_MASK;
1084         switch (type) {
1085         case LL_OP_CMD:
1086                 tmp |= LLOP_WE | LLOP_CLE;
1087                 break;
1088         case LL_OP_ADDR:
1089                 /* WE | ALE */
1090                 tmp |= LLOP_WE | LLOP_ALE;
1091                 break;
1092         case LL_OP_WR:
1093                 /* WE */
1094                 tmp |= LLOP_WE;
1095                 break;
1096         case LL_OP_RD:
1097                 /* RE */
1098                 tmp |= LLOP_RE;
1099                 break;
1100         }
1101         if (last_op)
1102                 /* RETURN_IDLE */
1103                 tmp |= LLOP_RETURN_IDLE;
1104
1105         dev_dbg(ctrl->dev, "ll_op cmd %#x\n", tmp);
1106
1107         brcmnand_write_reg(ctrl, BRCMNAND_LL_OP, tmp);
1108         (void)brcmnand_read_reg(ctrl, BRCMNAND_LL_OP);
1109
1110         brcmnand_send_cmd(host, CMD_LOW_LEVEL_OP);
1111         return brcmnand_waitfunc(mtd, chip);
1112 }
1113
1114 static void brcmnand_cmdfunc(struct mtd_info *mtd, unsigned command,
1115                              int column, int page_addr)
1116 {
1117         struct nand_chip *chip = mtd->priv;
1118         struct brcmnand_host *host = chip->priv;
1119         struct brcmnand_controller *ctrl = host->ctrl;
1120         u64 addr = (u64)page_addr << chip->page_shift;
1121         int native_cmd = 0;
1122
1123         if (command == NAND_CMD_READID || command == NAND_CMD_PARAM ||
1124                         command == NAND_CMD_RNDOUT)
1125                 addr = (u64)column;
1126         /* Avoid propagating a negative, don't-care address */
1127         else if (page_addr < 0)
1128                 addr = 0;
1129
1130         dev_dbg(ctrl->dev, "cmd 0x%x addr 0x%llx\n", command,
1131                 (unsigned long long)addr);
1132
1133         host->last_cmd = command;
1134         host->last_byte = 0;
1135         host->last_addr = addr;
1136
1137         switch (command) {
1138         case NAND_CMD_RESET:
1139                 native_cmd = CMD_FLASH_RESET;
1140                 break;
1141         case NAND_CMD_STATUS:
1142                 native_cmd = CMD_STATUS_READ;
1143                 break;
1144         case NAND_CMD_READID:
1145                 native_cmd = CMD_DEVICE_ID_READ;
1146                 break;
1147         case NAND_CMD_READOOB:
1148                 native_cmd = CMD_SPARE_AREA_READ;
1149                 break;
1150         case NAND_CMD_ERASE1:
1151                 native_cmd = CMD_BLOCK_ERASE;
1152                 brcmnand_wp(mtd, 0);
1153                 break;
1154         case NAND_CMD_PARAM:
1155                 native_cmd = CMD_PARAMETER_READ;
1156                 break;
1157         case NAND_CMD_SET_FEATURES:
1158         case NAND_CMD_GET_FEATURES:
1159                 brcmnand_low_level_op(host, LL_OP_CMD, command, false);
1160                 brcmnand_low_level_op(host, LL_OP_ADDR, column, false);
1161                 break;
1162         case NAND_CMD_RNDOUT:
1163                 native_cmd = CMD_PARAMETER_CHANGE_COL;
1164                 addr &= ~((u64)(FC_BYTES - 1));
1165                 /*
1166                  * HW quirk: PARAMETER_CHANGE_COL requires SECTOR_SIZE_1K=0
1167                  * NB: hwcfg.sector_size_1k may not be initialized yet
1168                  */
1169                 if (brcmnand_get_sector_size_1k(host)) {
1170                         host->hwcfg.sector_size_1k =
1171                                 brcmnand_get_sector_size_1k(host);
1172                         brcmnand_set_sector_size_1k(host, 0);
1173                 }
1174                 break;
1175         }
1176
1177         if (!native_cmd)
1178                 return;
1179
1180         brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
1181                 (host->cs << 16) | ((addr >> 32) & 0xffff));
1182         (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
1183         brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS, lower_32_bits(addr));
1184         (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
1185
1186         brcmnand_send_cmd(host, native_cmd);
1187         brcmnand_waitfunc(mtd, chip);
1188
1189         if (native_cmd == CMD_PARAMETER_READ ||
1190                         native_cmd == CMD_PARAMETER_CHANGE_COL) {
1191                 int i;
1192
1193                 brcmnand_soc_data_bus_prepare(ctrl->soc);
1194
1195                 /*
1196                  * Must cache the FLASH_CACHE now, since changes in
1197                  * SECTOR_SIZE_1K may invalidate it
1198                  */
1199                 for (i = 0; i < FC_WORDS; i++)
1200                         ctrl->flash_cache[i] = brcmnand_read_fc(ctrl, i);
1201
1202                 brcmnand_soc_data_bus_unprepare(ctrl->soc);
1203
1204                 /* Cleanup from HW quirk: restore SECTOR_SIZE_1K */
1205                 if (host->hwcfg.sector_size_1k)
1206                         brcmnand_set_sector_size_1k(host,
1207                                                     host->hwcfg.sector_size_1k);
1208         }
1209
1210         /* Re-enable protection is necessary only after erase */
1211         if (command == NAND_CMD_ERASE1)
1212                 brcmnand_wp(mtd, 1);
1213 }
1214
1215 static uint8_t brcmnand_read_byte(struct mtd_info *mtd)
1216 {
1217         struct nand_chip *chip = mtd->priv;
1218         struct brcmnand_host *host = chip->priv;
1219         struct brcmnand_controller *ctrl = host->ctrl;
1220         uint8_t ret = 0;
1221         int addr, offs;
1222
1223         switch (host->last_cmd) {
1224         case NAND_CMD_READID:
1225                 if (host->last_byte < 4)
1226                         ret = brcmnand_read_reg(ctrl, BRCMNAND_ID) >>
1227                                 (24 - (host->last_byte << 3));
1228                 else if (host->last_byte < 8)
1229                         ret = brcmnand_read_reg(ctrl, BRCMNAND_ID_EXT) >>
1230                                 (56 - (host->last_byte << 3));
1231                 break;
1232
1233         case NAND_CMD_READOOB:
1234                 ret = oob_reg_read(ctrl, host->last_byte);
1235                 break;
1236
1237         case NAND_CMD_STATUS:
1238                 ret = brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS) &
1239                                         INTFC_FLASH_STATUS;
1240                 if (wp_on) /* hide WP status */
1241                         ret |= NAND_STATUS_WP;
1242                 break;
1243
1244         case NAND_CMD_PARAM:
1245         case NAND_CMD_RNDOUT:
1246                 addr = host->last_addr + host->last_byte;
1247                 offs = addr & (FC_BYTES - 1);
1248
1249                 /* At FC_BYTES boundary, switch to next column */
1250                 if (host->last_byte > 0 && offs == 0)
1251                         chip->cmdfunc(mtd, NAND_CMD_RNDOUT, addr, -1);
1252
1253                 ret = ctrl->flash_cache[offs >> 2] >>
1254                                         (24 - ((offs & 0x03) << 3));
1255                 break;
1256         case NAND_CMD_GET_FEATURES:
1257                 if (host->last_byte >= ONFI_SUBFEATURE_PARAM_LEN) {
1258                         ret = 0;
1259                 } else {
1260                         bool last = host->last_byte ==
1261                                 ONFI_SUBFEATURE_PARAM_LEN - 1;
1262                         brcmnand_low_level_op(host, LL_OP_RD, 0, last);
1263                         ret = brcmnand_read_reg(ctrl, BRCMNAND_LL_RDATA) & 0xff;
1264                 }
1265         }
1266
1267         dev_dbg(ctrl->dev, "read byte = 0x%02x\n", ret);
1268         host->last_byte++;
1269
1270         return ret;
1271 }
1272
1273 static void brcmnand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
1274 {
1275         int i;
1276
1277         for (i = 0; i < len; i++, buf++)
1278                 *buf = brcmnand_read_byte(mtd);
1279 }
1280
1281 static void brcmnand_write_buf(struct mtd_info *mtd, const uint8_t *buf,
1282                                    int len)
1283 {
1284         int i;
1285         struct nand_chip *chip = mtd->priv;
1286         struct brcmnand_host *host = chip->priv;
1287
1288         switch (host->last_cmd) {
1289         case NAND_CMD_SET_FEATURES:
1290                 for (i = 0; i < len; i++)
1291                         brcmnand_low_level_op(host, LL_OP_WR, buf[i],
1292                                                   (i + 1) == len);
1293                 break;
1294         default:
1295                 BUG();
1296                 break;
1297         }
1298 }
1299
1300 /**
1301  * Construct a FLASH_DMA descriptor as part of a linked list. You must know the
1302  * following ahead of time:
1303  *  - Is this descriptor the beginning or end of a linked list?
1304  *  - What is the (DMA) address of the next descriptor in the linked list?
1305  */
1306 static int brcmnand_fill_dma_desc(struct brcmnand_host *host,
1307                                   struct brcm_nand_dma_desc *desc, u64 addr,
1308                                   dma_addr_t buf, u32 len, u8 dma_cmd,
1309                                   bool begin, bool end,
1310                                   dma_addr_t next_desc)
1311 {
1312         memset(desc, 0, sizeof(*desc));
1313         /* Descriptors are written in native byte order (wordwise) */
1314         desc->next_desc = lower_32_bits(next_desc);
1315         desc->next_desc_ext = upper_32_bits(next_desc);
1316         desc->cmd_irq = (dma_cmd << 24) |
1317                 (end ? (0x03 << 8) : 0) | /* IRQ | STOP */
1318                 (!!begin) | ((!!end) << 1); /* head, tail */
1319 #ifdef CONFIG_CPU_BIG_ENDIAN
1320         desc->cmd_irq |= 0x01 << 12;
1321 #endif
1322         desc->dram_addr = lower_32_bits(buf);
1323         desc->dram_addr_ext = upper_32_bits(buf);
1324         desc->tfr_len = len;
1325         desc->total_len = len;
1326         desc->flash_addr = lower_32_bits(addr);
1327         desc->flash_addr_ext = upper_32_bits(addr);
1328         desc->cs = host->cs;
1329         desc->status_valid = 0x01;
1330         return 0;
1331 }
1332
1333 /**
1334  * Kick the FLASH_DMA engine, with a given DMA descriptor
1335  */
1336 static void brcmnand_dma_run(struct brcmnand_host *host, dma_addr_t desc)
1337 {
1338         struct brcmnand_controller *ctrl = host->ctrl;
1339         unsigned long timeo = msecs_to_jiffies(100);
1340
1341         flash_dma_writel(ctrl, FLASH_DMA_FIRST_DESC, lower_32_bits(desc));
1342         (void)flash_dma_readl(ctrl, FLASH_DMA_FIRST_DESC);
1343         flash_dma_writel(ctrl, FLASH_DMA_FIRST_DESC_EXT, upper_32_bits(desc));
1344         (void)flash_dma_readl(ctrl, FLASH_DMA_FIRST_DESC_EXT);
1345
1346         /* Start FLASH_DMA engine */
1347         ctrl->dma_pending = true;
1348         mb(); /* flush previous writes */
1349         flash_dma_writel(ctrl, FLASH_DMA_CTRL, 0x03); /* wake | run */
1350
1351         if (wait_for_completion_timeout(&ctrl->dma_done, timeo) <= 0) {
1352                 dev_err(ctrl->dev,
1353                                 "timeout waiting for DMA; status %#x, error status %#x\n",
1354                                 flash_dma_readl(ctrl, FLASH_DMA_STATUS),
1355                                 flash_dma_readl(ctrl, FLASH_DMA_ERROR_STATUS));
1356         }
1357         ctrl->dma_pending = false;
1358         flash_dma_writel(ctrl, FLASH_DMA_CTRL, 0); /* force stop */
1359 }
1360
1361 static int brcmnand_dma_trans(struct brcmnand_host *host, u64 addr, u32 *buf,
1362                               u32 len, u8 dma_cmd)
1363 {
1364         struct brcmnand_controller *ctrl = host->ctrl;
1365         dma_addr_t buf_pa;
1366         int dir = dma_cmd == CMD_PAGE_READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1367
1368         buf_pa = dma_map_single(ctrl->dev, buf, len, dir);
1369         if (dma_mapping_error(ctrl->dev, buf_pa)) {
1370                 dev_err(ctrl->dev, "unable to map buffer for DMA\n");
1371                 return -ENOMEM;
1372         }
1373
1374         brcmnand_fill_dma_desc(host, ctrl->dma_desc, addr, buf_pa, len,
1375                                    dma_cmd, true, true, 0);
1376
1377         brcmnand_dma_run(host, ctrl->dma_pa);
1378
1379         dma_unmap_single(ctrl->dev, buf_pa, len, dir);
1380
1381         if (ctrl->dma_desc->status_valid & FLASH_DMA_ECC_ERROR)
1382                 return -EBADMSG;
1383         else if (ctrl->dma_desc->status_valid & FLASH_DMA_CORR_ERROR)
1384                 return -EUCLEAN;
1385
1386         return 0;
1387 }
1388
1389 /*
1390  * Assumes proper CS is already set
1391  */
1392 static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip,
1393                                 u64 addr, unsigned int trans, u32 *buf,
1394                                 u8 *oob, u64 *err_addr)
1395 {
1396         struct brcmnand_host *host = chip->priv;
1397         struct brcmnand_controller *ctrl = host->ctrl;
1398         int i, j, ret = 0;
1399
1400         /* Clear error addresses */
1401         brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_ADDR, 0);
1402         brcmnand_write_reg(ctrl, BRCMNAND_CORR_ADDR, 0);
1403
1404         brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
1405                         (host->cs << 16) | ((addr >> 32) & 0xffff));
1406         (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
1407
1408         for (i = 0; i < trans; i++, addr += FC_BYTES) {
1409                 brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS,
1410                                    lower_32_bits(addr));
1411                 (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
1412                 /* SPARE_AREA_READ does not use ECC, so just use PAGE_READ */
1413                 brcmnand_send_cmd(host, CMD_PAGE_READ);
1414                 brcmnand_waitfunc(mtd, chip);
1415
1416                 if (likely(buf)) {
1417                         brcmnand_soc_data_bus_prepare(ctrl->soc);
1418
1419                         for (j = 0; j < FC_WORDS; j++, buf++)
1420                                 *buf = brcmnand_read_fc(ctrl, j);
1421
1422                         brcmnand_soc_data_bus_unprepare(ctrl->soc);
1423                 }
1424
1425                 if (oob)
1426                         oob += read_oob_from_regs(ctrl, i, oob,
1427                                         mtd->oobsize / trans,
1428                                         host->hwcfg.sector_size_1k);
1429
1430                 if (!ret) {
1431                         *err_addr = brcmnand_read_reg(ctrl,
1432                                         BRCMNAND_UNCORR_ADDR) |
1433                                 ((u64)(brcmnand_read_reg(ctrl,
1434                                                 BRCMNAND_UNCORR_EXT_ADDR)
1435                                         & 0xffff) << 32);
1436                         if (*err_addr)
1437                                 ret = -EBADMSG;
1438                 }
1439
1440                 if (!ret) {
1441                         *err_addr = brcmnand_read_reg(ctrl,
1442                                         BRCMNAND_CORR_ADDR) |
1443                                 ((u64)(brcmnand_read_reg(ctrl,
1444                                                 BRCMNAND_CORR_EXT_ADDR)
1445                                         & 0xffff) << 32);
1446                         if (*err_addr)
1447                                 ret = -EUCLEAN;
1448                 }
1449         }
1450
1451         return ret;
1452 }
1453
1454 static int brcmnand_read(struct mtd_info *mtd, struct nand_chip *chip,
1455                          u64 addr, unsigned int trans, u32 *buf, u8 *oob)
1456 {
1457         struct brcmnand_host *host = chip->priv;
1458         struct brcmnand_controller *ctrl = host->ctrl;
1459         u64 err_addr = 0;
1460         int err;
1461
1462         dev_dbg(ctrl->dev, "read %llx -> %p\n", (unsigned long long)addr, buf);
1463
1464         brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_COUNT, 0);
1465
1466         if (has_flash_dma(ctrl) && !oob && flash_dma_buf_ok(buf)) {
1467                 err = brcmnand_dma_trans(host, addr, buf, trans * FC_BYTES,
1468                                              CMD_PAGE_READ);
1469                 if (err) {
1470                         if (mtd_is_bitflip_or_eccerr(err))
1471                                 err_addr = addr;
1472                         else
1473                                 return -EIO;
1474                 }
1475         } else {
1476                 if (oob)
1477                         memset(oob, 0x99, mtd->oobsize);
1478
1479                 err = brcmnand_read_by_pio(mtd, chip, addr, trans, buf,
1480                                                oob, &err_addr);
1481         }
1482
1483         if (mtd_is_eccerr(err)) {
1484                 dev_dbg(ctrl->dev, "uncorrectable error at 0x%llx\n",
1485                         (unsigned long long)err_addr);
1486                 mtd->ecc_stats.failed++;
1487                 /* NAND layer expects zero on ECC errors */
1488                 return 0;
1489         }
1490
1491         if (mtd_is_bitflip(err)) {
1492                 unsigned int corrected = brcmnand_count_corrected(ctrl);
1493
1494                 dev_dbg(ctrl->dev, "corrected error at 0x%llx\n",
1495                         (unsigned long long)err_addr);
1496                 mtd->ecc_stats.corrected += corrected;
1497                 /* Always exceed the software-imposed threshold */
1498                 return max(mtd->bitflip_threshold, corrected);
1499         }
1500
1501         return 0;
1502 }
1503
1504 static int brcmnand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
1505                               uint8_t *buf, int oob_required, int page)
1506 {
1507         struct brcmnand_host *host = chip->priv;
1508         u8 *oob = oob_required ? (u8 *)chip->oob_poi : NULL;
1509
1510         return brcmnand_read(mtd, chip, host->last_addr,
1511                         mtd->writesize >> FC_SHIFT, (u32 *)buf, oob);
1512 }
1513
1514 static int brcmnand_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
1515                                   uint8_t *buf, int oob_required, int page)
1516 {
1517         struct brcmnand_host *host = chip->priv;
1518         u8 *oob = oob_required ? (u8 *)chip->oob_poi : NULL;
1519         int ret;
1520
1521         brcmnand_set_ecc_enabled(host, 0);
1522         ret = brcmnand_read(mtd, chip, host->last_addr,
1523                         mtd->writesize >> FC_SHIFT, (u32 *)buf, oob);
1524         brcmnand_set_ecc_enabled(host, 1);
1525         return ret;
1526 }
1527
1528 static int brcmnand_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
1529                              int page)
1530 {
1531         return brcmnand_read(mtd, chip, (u64)page << chip->page_shift,
1532                         mtd->writesize >> FC_SHIFT,
1533                         NULL, (u8 *)chip->oob_poi);
1534 }
1535
1536 static int brcmnand_read_oob_raw(struct mtd_info *mtd, struct nand_chip *chip,
1537                                  int page)
1538 {
1539         struct brcmnand_host *host = chip->priv;
1540
1541         brcmnand_set_ecc_enabled(host, 0);
1542         brcmnand_read(mtd, chip, (u64)page << chip->page_shift,
1543                 mtd->writesize >> FC_SHIFT,
1544                 NULL, (u8 *)chip->oob_poi);
1545         brcmnand_set_ecc_enabled(host, 1);
1546         return 0;
1547 }
1548
1549 static int brcmnand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
1550                                  uint32_t data_offs, uint32_t readlen,
1551                                  uint8_t *bufpoi, int page)
1552 {
1553         struct brcmnand_host *host = chip->priv;
1554
1555         return brcmnand_read(mtd, chip, host->last_addr + data_offs,
1556                         readlen >> FC_SHIFT, (u32 *)bufpoi, NULL);
1557 }
1558
1559 static int brcmnand_write(struct mtd_info *mtd, struct nand_chip *chip,
1560                           u64 addr, const u32 *buf, u8 *oob)
1561 {
1562         struct brcmnand_host *host = chip->priv;
1563         struct brcmnand_controller *ctrl = host->ctrl;
1564         unsigned int i, j, trans = mtd->writesize >> FC_SHIFT;
1565         int status, ret = 0;
1566
1567         dev_dbg(ctrl->dev, "write %llx <- %p\n", (unsigned long long)addr, buf);
1568
1569         if (unlikely((unsigned long)buf & 0x03)) {
1570                 dev_warn(ctrl->dev, "unaligned buffer: %p\n", buf);
1571                 buf = (u32 *)((unsigned long)buf & ~0x03);
1572         }
1573
1574         brcmnand_wp(mtd, 0);
1575
1576         for (i = 0; i < ctrl->max_oob; i += 4)
1577                 oob_reg_write(ctrl, i, 0xffffffff);
1578
1579         if (has_flash_dma(ctrl) && !oob && flash_dma_buf_ok(buf)) {
1580                 if (brcmnand_dma_trans(host, addr, (u32 *)buf,
1581                                         mtd->writesize, CMD_PROGRAM_PAGE))
1582                         ret = -EIO;
1583                 goto out;
1584         }
1585
1586         brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
1587                         (host->cs << 16) | ((addr >> 32) & 0xffff));
1588         (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
1589
1590         for (i = 0; i < trans; i++, addr += FC_BYTES) {
1591                 /* full address MUST be set before populating FC */
1592                 brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS,
1593                                    lower_32_bits(addr));
1594                 (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
1595
1596                 if (buf) {
1597                         brcmnand_soc_data_bus_prepare(ctrl->soc);
1598
1599                         for (j = 0; j < FC_WORDS; j++, buf++)
1600                                 brcmnand_write_fc(ctrl, j, *buf);
1601
1602                         brcmnand_soc_data_bus_unprepare(ctrl->soc);
1603                 } else if (oob) {
1604                         for (j = 0; j < FC_WORDS; j++)
1605                                 brcmnand_write_fc(ctrl, j, 0xffffffff);
1606                 }
1607
1608                 if (oob) {
1609                         oob += write_oob_to_regs(ctrl, i, oob,
1610                                         mtd->oobsize / trans,
1611                                         host->hwcfg.sector_size_1k);
1612                 }
1613
1614                 /* we cannot use SPARE_AREA_PROGRAM when PARTIAL_PAGE_EN=0 */
1615                 brcmnand_send_cmd(host, CMD_PROGRAM_PAGE);
1616                 status = brcmnand_waitfunc(mtd, chip);
1617
1618                 if (status & NAND_STATUS_FAIL) {
1619                         dev_info(ctrl->dev, "program failed at %llx\n",
1620                                 (unsigned long long)addr);
1621                         ret = -EIO;
1622                         goto out;
1623                 }
1624         }
1625 out:
1626         brcmnand_wp(mtd, 1);
1627         return ret;
1628 }
1629
1630 static int brcmnand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
1631                                const uint8_t *buf, int oob_required, int page)
1632 {
1633         struct brcmnand_host *host = chip->priv;
1634         void *oob = oob_required ? chip->oob_poi : NULL;
1635
1636         brcmnand_write(mtd, chip, host->last_addr, (const u32 *)buf, oob);
1637         return 0;
1638 }
1639
1640 static int brcmnand_write_page_raw(struct mtd_info *mtd,
1641                                    struct nand_chip *chip, const uint8_t *buf,
1642                                    int oob_required, int page)
1643 {
1644         struct brcmnand_host *host = chip->priv;
1645         void *oob = oob_required ? chip->oob_poi : NULL;
1646
1647         brcmnand_set_ecc_enabled(host, 0);
1648         brcmnand_write(mtd, chip, host->last_addr, (const u32 *)buf, oob);
1649         brcmnand_set_ecc_enabled(host, 1);
1650         return 0;
1651 }
1652
1653 static int brcmnand_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
1654                                   int page)
1655 {
1656         return brcmnand_write(mtd, chip, (u64)page << chip->page_shift,
1657                                   NULL, chip->oob_poi);
1658 }
1659
1660 static int brcmnand_write_oob_raw(struct mtd_info *mtd, struct nand_chip *chip,
1661                                   int page)
1662 {
1663         struct brcmnand_host *host = chip->priv;
1664         int ret;
1665
1666         brcmnand_set_ecc_enabled(host, 0);
1667         ret = brcmnand_write(mtd, chip, (u64)page << chip->page_shift, NULL,
1668                                  (u8 *)chip->oob_poi);
1669         brcmnand_set_ecc_enabled(host, 1);
1670
1671         return ret;
1672 }
1673
1674 /***********************************************************************
1675  * Per-CS setup (1 NAND device)
1676  ***********************************************************************/
1677
1678 static int brcmnand_set_cfg(struct brcmnand_host *host,
1679                             struct brcmnand_cfg *cfg)
1680 {
1681         struct brcmnand_controller *ctrl = host->ctrl;
1682         struct nand_chip *chip = &host->chip;
1683         u16 cfg_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_CFG);
1684         u16 cfg_ext_offs = brcmnand_cs_offset(ctrl, host->cs,
1685                         BRCMNAND_CS_CFG_EXT);
1686         u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs,
1687                         BRCMNAND_CS_ACC_CONTROL);
1688         u8 block_size = 0, page_size = 0, device_size = 0;
1689         u32 tmp;
1690
1691         if (ctrl->block_sizes) {
1692                 int i, found;
1693
1694                 for (i = 0, found = 0; ctrl->block_sizes[i]; i++)
1695                         if (ctrl->block_sizes[i] * 1024 == cfg->block_size) {
1696                                 block_size = i;
1697                                 found = 1;
1698                         }
1699                 if (!found) {
1700                         dev_warn(ctrl->dev, "invalid block size %u\n",
1701                                         cfg->block_size);
1702                         return -EINVAL;
1703                 }
1704         } else {
1705                 block_size = ffs(cfg->block_size) - ffs(BRCMNAND_MIN_BLOCKSIZE);
1706         }
1707
1708         if (cfg->block_size < BRCMNAND_MIN_BLOCKSIZE || (ctrl->max_block_size &&
1709                                 cfg->block_size > ctrl->max_block_size)) {
1710                 dev_warn(ctrl->dev, "invalid block size %u\n",
1711                                 cfg->block_size);
1712                 block_size = 0;
1713         }
1714
1715         if (ctrl->page_sizes) {
1716                 int i, found;
1717
1718                 for (i = 0, found = 0; ctrl->page_sizes[i]; i++)
1719                         if (ctrl->page_sizes[i] == cfg->page_size) {
1720                                 page_size = i;
1721                                 found = 1;
1722                         }
1723                 if (!found) {
1724                         dev_warn(ctrl->dev, "invalid page size %u\n",
1725                                         cfg->page_size);
1726                         return -EINVAL;
1727                 }
1728         } else {
1729                 page_size = ffs(cfg->page_size) - ffs(BRCMNAND_MIN_PAGESIZE);
1730         }
1731
1732         if (cfg->page_size < BRCMNAND_MIN_PAGESIZE || (ctrl->max_page_size &&
1733                                 cfg->page_size > ctrl->max_page_size)) {
1734                 dev_warn(ctrl->dev, "invalid page size %u\n", cfg->page_size);
1735                 return -EINVAL;
1736         }
1737
1738         if (fls64(cfg->device_size) < fls64(BRCMNAND_MIN_DEVSIZE)) {
1739                 dev_warn(ctrl->dev, "invalid device size 0x%llx\n",
1740                         (unsigned long long)cfg->device_size);
1741                 return -EINVAL;
1742         }
1743         device_size = fls64(cfg->device_size) - fls64(BRCMNAND_MIN_DEVSIZE);
1744
1745         tmp = (cfg->blk_adr_bytes << CFG_BLK_ADR_BYTES_SHIFT) |
1746                 (cfg->col_adr_bytes << CFG_COL_ADR_BYTES_SHIFT) |
1747                 (cfg->ful_adr_bytes << CFG_FUL_ADR_BYTES_SHIFT) |
1748                 (!!(cfg->device_width == 16) << CFG_BUS_WIDTH_SHIFT) |
1749                 (device_size << CFG_DEVICE_SIZE_SHIFT);
1750         if (cfg_offs == cfg_ext_offs) {
1751                 tmp |= (page_size << CFG_PAGE_SIZE_SHIFT) |
1752                        (block_size << CFG_BLK_SIZE_SHIFT);
1753                 nand_writereg(ctrl, cfg_offs, tmp);
1754         } else {
1755                 nand_writereg(ctrl, cfg_offs, tmp);
1756                 tmp = (page_size << CFG_EXT_PAGE_SIZE_SHIFT) |
1757                       (block_size << CFG_EXT_BLK_SIZE_SHIFT);
1758                 nand_writereg(ctrl, cfg_ext_offs, tmp);
1759         }
1760
1761         tmp = nand_readreg(ctrl, acc_control_offs);
1762         tmp &= ~brcmnand_ecc_level_mask(ctrl);
1763         tmp |= cfg->ecc_level << NAND_ACC_CONTROL_ECC_SHIFT;
1764         tmp &= ~brcmnand_spare_area_mask(ctrl);
1765         tmp |= cfg->spare_area_size;
1766         nand_writereg(ctrl, acc_control_offs, tmp);
1767
1768         brcmnand_set_sector_size_1k(host, cfg->sector_size_1k);
1769
1770         /* threshold = ceil(BCH-level * 0.75) */
1771         brcmnand_wr_corr_thresh(host, DIV_ROUND_UP(chip->ecc.strength * 3, 4));
1772
1773         return 0;
1774 }
1775
1776 static void brcmnand_print_cfg(char *buf, struct brcmnand_cfg *cfg)
1777 {
1778         buf += sprintf(buf,
1779                 "%lluMiB total, %uKiB blocks, %u%s pages, %uB OOB, %u-bit",
1780                 (unsigned long long)cfg->device_size >> 20,
1781                 cfg->block_size >> 10,
1782                 cfg->page_size >= 1024 ? cfg->page_size >> 10 : cfg->page_size,
1783                 cfg->page_size >= 1024 ? "KiB" : "B",
1784                 cfg->spare_area_size, cfg->device_width);
1785
1786         /* Account for Hamming ECC and for BCH 512B vs 1KiB sectors */
1787         if (is_hamming_ecc(cfg))
1788                 sprintf(buf, ", Hamming ECC");
1789         else if (cfg->sector_size_1k)
1790                 sprintf(buf, ", BCH-%u (1KiB sector)", cfg->ecc_level << 1);
1791         else
1792                 sprintf(buf, ", BCH-%u", cfg->ecc_level);
1793 }
1794
1795 /*
1796  * Minimum number of bytes to address a page. Calculated as:
1797  *     roundup(log2(size / page-size) / 8)
1798  *
1799  * NB: the following does not "round up" for non-power-of-2 'size'; but this is
1800  *     OK because many other things will break if 'size' is irregular...
1801  */
1802 static inline int get_blk_adr_bytes(u64 size, u32 writesize)
1803 {
1804         return ALIGN(ilog2(size) - ilog2(writesize), 8) >> 3;
1805 }
1806
1807 static int brcmnand_setup_dev(struct brcmnand_host *host)
1808 {
1809         struct mtd_info *mtd = &host->mtd;
1810         struct nand_chip *chip = &host->chip;
1811         struct brcmnand_controller *ctrl = host->ctrl;
1812         struct brcmnand_cfg *cfg = &host->hwcfg;
1813         char msg[128];
1814         u32 offs, tmp, oob_sector;
1815         int ret;
1816
1817         memset(cfg, 0, sizeof(*cfg));
1818
1819         ret = of_property_read_u32(chip->flash_node,
1820                                    "brcm,nand-oob-sector-size",
1821                                    &oob_sector);
1822         if (ret) {
1823                 /* Use detected size */
1824                 cfg->spare_area_size = mtd->oobsize /
1825                                         (mtd->writesize >> FC_SHIFT);
1826         } else {
1827                 cfg->spare_area_size = oob_sector;
1828         }
1829         if (cfg->spare_area_size > ctrl->max_oob)
1830                 cfg->spare_area_size = ctrl->max_oob;
1831         /*
1832          * Set oobsize to be consistent with controller's spare_area_size, as
1833          * the rest is inaccessible.
1834          */
1835         mtd->oobsize = cfg->spare_area_size * (mtd->writesize >> FC_SHIFT);
1836
1837         cfg->device_size = mtd->size;
1838         cfg->block_size = mtd->erasesize;
1839         cfg->page_size = mtd->writesize;
1840         cfg->device_width = (chip->options & NAND_BUSWIDTH_16) ? 16 : 8;
1841         cfg->col_adr_bytes = 2;
1842         cfg->blk_adr_bytes = get_blk_adr_bytes(mtd->size, mtd->writesize);
1843
1844         switch (chip->ecc.size) {
1845         case 512:
1846                 if (chip->ecc.strength == 1) /* Hamming */
1847                         cfg->ecc_level = 15;
1848                 else
1849                         cfg->ecc_level = chip->ecc.strength;
1850                 cfg->sector_size_1k = 0;
1851                 break;
1852         case 1024:
1853                 if (!(ctrl->features & BRCMNAND_HAS_1K_SECTORS)) {
1854                         dev_err(ctrl->dev, "1KB sectors not supported\n");
1855                         return -EINVAL;
1856                 }
1857                 if (chip->ecc.strength & 0x1) {
1858                         dev_err(ctrl->dev,
1859                                 "odd ECC not supported with 1KB sectors\n");
1860                         return -EINVAL;
1861                 }
1862
1863                 cfg->ecc_level = chip->ecc.strength >> 1;
1864                 cfg->sector_size_1k = 1;
1865                 break;
1866         default:
1867                 dev_err(ctrl->dev, "unsupported ECC size: %d\n",
1868                         chip->ecc.size);
1869                 return -EINVAL;
1870         }
1871
1872         cfg->ful_adr_bytes = cfg->blk_adr_bytes;
1873         if (mtd->writesize > 512)
1874                 cfg->ful_adr_bytes += cfg->col_adr_bytes;
1875         else
1876                 cfg->ful_adr_bytes += 1;
1877
1878         ret = brcmnand_set_cfg(host, cfg);
1879         if (ret)
1880                 return ret;
1881
1882         brcmnand_set_ecc_enabled(host, 1);
1883
1884         brcmnand_print_cfg(msg, cfg);
1885         dev_info(ctrl->dev, "detected %s\n", msg);
1886
1887         /* Configure ACC_CONTROL */
1888         offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_ACC_CONTROL);
1889         tmp = nand_readreg(ctrl, offs);
1890         tmp &= ~ACC_CONTROL_PARTIAL_PAGE;
1891         tmp &= ~ACC_CONTROL_RD_ERASED;
1892         tmp &= ~ACC_CONTROL_FAST_PGM_RDIN;
1893         if (ctrl->features & BRCMNAND_HAS_PREFETCH) {
1894                 /*
1895                  * FIXME: Flash DMA + prefetch may see spurious erased-page ECC
1896                  * errors
1897                  */
1898                 if (has_flash_dma(ctrl))
1899                         tmp &= ~ACC_CONTROL_PREFETCH;
1900                 else
1901                         tmp |= ACC_CONTROL_PREFETCH;
1902         }
1903         nand_writereg(ctrl, offs, tmp);
1904
1905         return 0;
1906 }
1907
1908 static int brcmnand_init_cs(struct brcmnand_host *host)
1909 {
1910         struct brcmnand_controller *ctrl = host->ctrl;
1911         struct device_node *dn = host->of_node;
1912         struct platform_device *pdev = host->pdev;
1913         struct mtd_info *mtd;
1914         struct nand_chip *chip;
1915         int ret;
1916         u16 cfg_offs;
1917         struct mtd_part_parser_data ppdata = { .of_node = dn };
1918
1919         ret = of_property_read_u32(dn, "reg", &host->cs);
1920         if (ret) {
1921                 dev_err(&pdev->dev, "can't get chip-select\n");
1922                 return -ENXIO;
1923         }
1924
1925         mtd = &host->mtd;
1926         chip = &host->chip;
1927
1928         chip->flash_node = dn;
1929         chip->priv = host;
1930         mtd->priv = chip;
1931         mtd->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "brcmnand.%d",
1932                                    host->cs);
1933         mtd->owner = THIS_MODULE;
1934         mtd->dev.parent = &pdev->dev;
1935
1936         chip->IO_ADDR_R = (void __iomem *)0xdeadbeef;
1937         chip->IO_ADDR_W = (void __iomem *)0xdeadbeef;
1938
1939         chip->cmd_ctrl = brcmnand_cmd_ctrl;
1940         chip->cmdfunc = brcmnand_cmdfunc;
1941         chip->waitfunc = brcmnand_waitfunc;
1942         chip->read_byte = brcmnand_read_byte;
1943         chip->read_buf = brcmnand_read_buf;
1944         chip->write_buf = brcmnand_write_buf;
1945
1946         chip->ecc.mode = NAND_ECC_HW;
1947         chip->ecc.read_page = brcmnand_read_page;
1948         chip->ecc.read_subpage = brcmnand_read_subpage;
1949         chip->ecc.write_page = brcmnand_write_page;
1950         chip->ecc.read_page_raw = brcmnand_read_page_raw;
1951         chip->ecc.write_page_raw = brcmnand_write_page_raw;
1952         chip->ecc.write_oob_raw = brcmnand_write_oob_raw;
1953         chip->ecc.read_oob_raw = brcmnand_read_oob_raw;
1954         chip->ecc.read_oob = brcmnand_read_oob;
1955         chip->ecc.write_oob = brcmnand_write_oob;
1956
1957         chip->controller = &ctrl->controller;
1958
1959         /*
1960          * The bootloader might have configured 16bit mode but
1961          * NAND READID command only works in 8bit mode. We force
1962          * 8bit mode here to ensure that NAND READID commands works.
1963          */
1964         cfg_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_CFG);
1965         nand_writereg(ctrl, cfg_offs,
1966                       nand_readreg(ctrl, cfg_offs) & ~CFG_BUS_WIDTH);
1967
1968         if (nand_scan_ident(mtd, 1, NULL))
1969                 return -ENXIO;
1970
1971         chip->options |= NAND_NO_SUBPAGE_WRITE;
1972         /*
1973          * Avoid (for instance) kmap()'d buffers from JFFS2, which we can't DMA
1974          * to/from, and have nand_base pass us a bounce buffer instead, as
1975          * needed.
1976          */
1977         chip->options |= NAND_USE_BOUNCE_BUFFER;
1978
1979         if (of_get_nand_on_flash_bbt(dn))
1980                 chip->bbt_options |= NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
1981
1982         if (brcmnand_setup_dev(host))
1983                 return -ENXIO;
1984
1985         chip->ecc.size = host->hwcfg.sector_size_1k ? 1024 : 512;
1986         /* only use our internal HW threshold */
1987         mtd->bitflip_threshold = 1;
1988
1989         chip->ecc.layout = brcmstb_choose_ecc_layout(host);
1990         if (!chip->ecc.layout)
1991                 return -ENXIO;
1992
1993         if (nand_scan_tail(mtd))
1994                 return -ENXIO;
1995
1996         return mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0);
1997 }
1998
1999 static void brcmnand_save_restore_cs_config(struct brcmnand_host *host,
2000                                             int restore)
2001 {
2002         struct brcmnand_controller *ctrl = host->ctrl;
2003         u16 cfg_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_CFG);
2004         u16 cfg_ext_offs = brcmnand_cs_offset(ctrl, host->cs,
2005                         BRCMNAND_CS_CFG_EXT);
2006         u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs,
2007                         BRCMNAND_CS_ACC_CONTROL);
2008         u16 t1_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_TIMING1);
2009         u16 t2_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_TIMING2);
2010
2011         if (restore) {
2012                 nand_writereg(ctrl, cfg_offs, host->hwcfg.config);
2013                 if (cfg_offs != cfg_ext_offs)
2014                         nand_writereg(ctrl, cfg_ext_offs,
2015                                       host->hwcfg.config_ext);
2016                 nand_writereg(ctrl, acc_control_offs, host->hwcfg.acc_control);
2017                 nand_writereg(ctrl, t1_offs, host->hwcfg.timing_1);
2018                 nand_writereg(ctrl, t2_offs, host->hwcfg.timing_2);
2019         } else {
2020                 host->hwcfg.config = nand_readreg(ctrl, cfg_offs);
2021                 if (cfg_offs != cfg_ext_offs)
2022                         host->hwcfg.config_ext =
2023                                 nand_readreg(ctrl, cfg_ext_offs);
2024                 host->hwcfg.acc_control = nand_readreg(ctrl, acc_control_offs);
2025                 host->hwcfg.timing_1 = nand_readreg(ctrl, t1_offs);
2026                 host->hwcfg.timing_2 = nand_readreg(ctrl, t2_offs);
2027         }
2028 }
2029
2030 static int brcmnand_suspend(struct device *dev)
2031 {
2032         struct brcmnand_controller *ctrl = dev_get_drvdata(dev);
2033         struct brcmnand_host *host;
2034
2035         list_for_each_entry(host, &ctrl->host_list, node)
2036                 brcmnand_save_restore_cs_config(host, 0);
2037
2038         ctrl->nand_cs_nand_select = brcmnand_read_reg(ctrl, BRCMNAND_CS_SELECT);
2039         ctrl->nand_cs_nand_xor = brcmnand_read_reg(ctrl, BRCMNAND_CS_XOR);
2040         ctrl->corr_stat_threshold =
2041                 brcmnand_read_reg(ctrl, BRCMNAND_CORR_THRESHOLD);
2042
2043         if (has_flash_dma(ctrl))
2044                 ctrl->flash_dma_mode = flash_dma_readl(ctrl, FLASH_DMA_MODE);
2045
2046         return 0;
2047 }
2048
2049 static int brcmnand_resume(struct device *dev)
2050 {
2051         struct brcmnand_controller *ctrl = dev_get_drvdata(dev);
2052         struct brcmnand_host *host;
2053
2054         if (has_flash_dma(ctrl)) {
2055                 flash_dma_writel(ctrl, FLASH_DMA_MODE, ctrl->flash_dma_mode);
2056                 flash_dma_writel(ctrl, FLASH_DMA_ERROR_STATUS, 0);
2057         }
2058
2059         brcmnand_write_reg(ctrl, BRCMNAND_CS_SELECT, ctrl->nand_cs_nand_select);
2060         brcmnand_write_reg(ctrl, BRCMNAND_CS_XOR, ctrl->nand_cs_nand_xor);
2061         brcmnand_write_reg(ctrl, BRCMNAND_CORR_THRESHOLD,
2062                         ctrl->corr_stat_threshold);
2063         if (ctrl->soc) {
2064                 /* Clear/re-enable interrupt */
2065                 ctrl->soc->ctlrdy_ack(ctrl->soc);
2066                 ctrl->soc->ctlrdy_set_enabled(ctrl->soc, true);
2067         }
2068
2069         list_for_each_entry(host, &ctrl->host_list, node) {
2070                 struct mtd_info *mtd = &host->mtd;
2071                 struct nand_chip *chip = mtd->priv;
2072
2073                 brcmnand_save_restore_cs_config(host, 1);
2074
2075                 /* Reset the chip, required by some chips after power-up */
2076                 chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
2077         }
2078
2079         return 0;
2080 }
2081
2082 const struct dev_pm_ops brcmnand_pm_ops = {
2083         .suspend                = brcmnand_suspend,
2084         .resume                 = brcmnand_resume,
2085 };
2086 EXPORT_SYMBOL_GPL(brcmnand_pm_ops);
2087
2088 static const struct of_device_id brcmnand_of_match[] = {
2089         { .compatible = "brcm,brcmnand-v4.0" },
2090         { .compatible = "brcm,brcmnand-v5.0" },
2091         { .compatible = "brcm,brcmnand-v6.0" },
2092         { .compatible = "brcm,brcmnand-v6.1" },
2093         { .compatible = "brcm,brcmnand-v7.0" },
2094         { .compatible = "brcm,brcmnand-v7.1" },
2095         {},
2096 };
2097 MODULE_DEVICE_TABLE(of, brcmnand_of_match);
2098
2099 /***********************************************************************
2100  * Platform driver setup (per controller)
2101  ***********************************************************************/
2102
2103 int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc)
2104 {
2105         struct device *dev = &pdev->dev;
2106         struct device_node *dn = dev->of_node, *child;
2107         struct brcmnand_controller *ctrl;
2108         struct resource *res;
2109         int ret;
2110
2111         /* We only support device-tree instantiation */
2112         if (!dn)
2113                 return -ENODEV;
2114
2115         if (!of_match_node(brcmnand_of_match, dn))
2116                 return -ENODEV;
2117
2118         ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
2119         if (!ctrl)
2120                 return -ENOMEM;
2121
2122         dev_set_drvdata(dev, ctrl);
2123         ctrl->dev = dev;
2124
2125         init_completion(&ctrl->done);
2126         init_completion(&ctrl->dma_done);
2127         spin_lock_init(&ctrl->controller.lock);
2128         init_waitqueue_head(&ctrl->controller.wq);
2129         INIT_LIST_HEAD(&ctrl->host_list);
2130
2131         /* NAND register range */
2132         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2133         ctrl->nand_base = devm_ioremap_resource(dev, res);
2134         if (IS_ERR(ctrl->nand_base))
2135                 return PTR_ERR(ctrl->nand_base);
2136
2137         /* Initialize NAND revision */
2138         ret = brcmnand_revision_init(ctrl);
2139         if (ret)
2140                 return ret;
2141
2142         /*
2143          * Most chips have this cache at a fixed offset within 'nand' block.
2144          * Some must specify this region separately.
2145          */
2146         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand-cache");
2147         if (res) {
2148                 ctrl->nand_fc = devm_ioremap_resource(dev, res);
2149                 if (IS_ERR(ctrl->nand_fc))
2150                         return PTR_ERR(ctrl->nand_fc);
2151         } else {
2152                 ctrl->nand_fc = ctrl->nand_base +
2153                                 ctrl->reg_offsets[BRCMNAND_FC_BASE];
2154         }
2155
2156         /* FLASH_DMA */
2157         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "flash-dma");
2158         if (res) {
2159                 ctrl->flash_dma_base = devm_ioremap_resource(dev, res);
2160                 if (IS_ERR(ctrl->flash_dma_base))
2161                         return PTR_ERR(ctrl->flash_dma_base);
2162
2163                 flash_dma_writel(ctrl, FLASH_DMA_MODE, 1); /* linked-list */
2164                 flash_dma_writel(ctrl, FLASH_DMA_ERROR_STATUS, 0);
2165
2166                 /* Allocate descriptor(s) */
2167                 ctrl->dma_desc = dmam_alloc_coherent(dev,
2168                                                      sizeof(*ctrl->dma_desc),
2169                                                      &ctrl->dma_pa, GFP_KERNEL);
2170                 if (!ctrl->dma_desc)
2171                         return -ENOMEM;
2172
2173                 ctrl->dma_irq = platform_get_irq(pdev, 1);
2174                 if ((int)ctrl->dma_irq < 0) {
2175                         dev_err(dev, "missing FLASH_DMA IRQ\n");
2176                         return -ENODEV;
2177                 }
2178
2179                 ret = devm_request_irq(dev, ctrl->dma_irq,
2180                                 brcmnand_dma_irq, 0, DRV_NAME,
2181                                 ctrl);
2182                 if (ret < 0) {
2183                         dev_err(dev, "can't allocate IRQ %d: error %d\n",
2184                                         ctrl->dma_irq, ret);
2185                         return ret;
2186                 }
2187
2188                 dev_info(dev, "enabling FLASH_DMA\n");
2189         }
2190
2191         /* Disable automatic device ID config, direct addressing */
2192         brcmnand_rmw_reg(ctrl, BRCMNAND_CS_SELECT,
2193                          CS_SELECT_AUTO_DEVICE_ID_CFG | 0xff, 0, 0);
2194         /* Disable XOR addressing */
2195         brcmnand_rmw_reg(ctrl, BRCMNAND_CS_XOR, 0xff, 0, 0);
2196
2197         if (ctrl->features & BRCMNAND_HAS_WP) {
2198                 /* Permanently disable write protection */
2199                 if (wp_on == 2)
2200                         brcmnand_set_wp(ctrl, false);
2201         } else {
2202                 wp_on = 0;
2203         }
2204
2205         /* IRQ */
2206         ctrl->irq = platform_get_irq(pdev, 0);
2207         if ((int)ctrl->irq < 0) {
2208                 dev_err(dev, "no IRQ defined\n");
2209                 return -ENODEV;
2210         }
2211
2212         /*
2213          * Some SoCs integrate this controller (e.g., its interrupt bits) in
2214          * interesting ways
2215          */
2216         if (soc) {
2217                 ctrl->soc = soc;
2218
2219                 ret = devm_request_irq(dev, ctrl->irq, brcmnand_irq, 0,
2220                                        DRV_NAME, ctrl);
2221
2222                 /* Enable interrupt */
2223                 ctrl->soc->ctlrdy_ack(ctrl->soc);
2224                 ctrl->soc->ctlrdy_set_enabled(ctrl->soc, true);
2225         } else {
2226                 /* Use standard interrupt infrastructure */
2227                 ret = devm_request_irq(dev, ctrl->irq, brcmnand_ctlrdy_irq, 0,
2228                                        DRV_NAME, ctrl);
2229         }
2230         if (ret < 0) {
2231                 dev_err(dev, "can't allocate IRQ %d: error %d\n",
2232                         ctrl->irq, ret);
2233                 return ret;
2234         }
2235
2236         for_each_available_child_of_node(dn, child) {
2237                 if (of_device_is_compatible(child, "brcm,nandcs")) {
2238                         struct brcmnand_host *host;
2239
2240                         host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
2241                         if (!host)
2242                                 return -ENOMEM;
2243                         host->pdev = pdev;
2244                         host->ctrl = ctrl;
2245                         host->of_node = child;
2246
2247                         ret = brcmnand_init_cs(host);
2248                         if (ret)
2249                                 continue; /* Try all chip-selects */
2250
2251                         list_add_tail(&host->node, &ctrl->host_list);
2252                 }
2253         }
2254
2255         /* No chip-selects could initialize properly */
2256         if (list_empty(&ctrl->host_list))
2257                 return -ENODEV;
2258
2259         return 0;
2260 }
2261 EXPORT_SYMBOL_GPL(brcmnand_probe);
2262
2263 int brcmnand_remove(struct platform_device *pdev)
2264 {
2265         struct brcmnand_controller *ctrl = dev_get_drvdata(&pdev->dev);
2266         struct brcmnand_host *host;
2267
2268         list_for_each_entry(host, &ctrl->host_list, node)
2269                 nand_release(&host->mtd);
2270
2271         dev_set_drvdata(&pdev->dev, NULL);
2272
2273         return 0;
2274 }
2275 EXPORT_SYMBOL_GPL(brcmnand_remove);
2276
2277 MODULE_LICENSE("GPL v2");
2278 MODULE_AUTHOR("Kevin Cernekee");
2279 MODULE_AUTHOR("Brian Norris");
2280 MODULE_DESCRIPTION("NAND driver for Broadcom chips");
2281 MODULE_ALIAS("platform:brcmnand");