drivers/mtd/nand/fsl_ifc_spl.c

   1 /*
   2  * NAND boot for Freescale Integrated Flash Controller, NAND FCM
   3  *
   4  * Copyright 2011 Freescale Semiconductor, Inc.
   5  * Author: Dipen Dudhat <dipen.dudhat@freescale.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <asm/io.h>
  12 #include <fsl_ifc.h>
  13 #include <linux/mtd/nand.h>
  14
  15 static inline int is_blank(uchar *addr, int page_size)
  16 {
  17         int i;
  18
  19         for (i = 0; i < page_size; i++) {
  20                 if (__raw_readb(&addr[i]) != 0xff)
  21                         return 0;
  22         }
  23
  24         /*
  25          * For the SPL, don't worry about uncorrectable errors
  26          * where the main area is all FFs but shouldn't be.
  27          */
  28         return 1;
  29 }
  30
  31 /* returns nonzero if entire page is blank */
  32 static inline int check_read_ecc(uchar *buf, u32 *eccstat,
  33                                  unsigned int bufnum, int page_size)
  34 {
  35         u32 reg = eccstat[bufnum / 4];
  36         int errors = (reg >> ((3 - bufnum % 4) * 8)) & 0xf;
  37
  38         if (errors == 0xf) { /* uncorrectable */
  39                 /* Blank pages fail hw ECC checks */
  40                 if (is_blank(buf, page_size))
  41                         return 1;
  42
  43                 puts("ecc error\n");
  44                 for (;;)
  45                         ;
  46         }
  47
  48         return 0;
  49 }
  50
  51 static inline struct fsl_ifc_runtime *runtime_regs_address(void)
  52 {
  53         struct fsl_ifc regs = {(void *)CONFIG_SYS_IFC_ADDR, NULL};
  54         int ver = 0;
  55
  56         ver = ifc_in32(&regs.gregs->ifc_rev);
  57         if (ver >= FSL_IFC_V2_0_0)
  58                 regs.rregs = (void *)CONFIG_SYS_IFC_ADDR + IFC_RREGS_64KOFFSET;
  59         else
  60                 regs.rregs = (void *)CONFIG_SYS_IFC_ADDR + IFC_RREGS_4KOFFSET;
  61
  62         return regs.rregs;
  63 }
  64
  65 static inline void nand_wait(uchar *buf, int bufnum, int page_size)
  66 {
  67         struct fsl_ifc_runtime *ifc = runtime_regs_address();
  68         u32 status;
  69         u32 eccstat[8];
  70         int bufperpage = page_size / 512;
  71         int bufnum_end, i;
  72
  73         bufnum *= bufperpage;
  74         bufnum_end = bufnum + bufperpage - 1;
  75
  76         do {
  77                 status = ifc_in32(&ifc->ifc_nand.nand_evter_stat);
  78         } while (!(status & IFC_NAND_EVTER_STAT_OPC));
  79
  80         if (status & IFC_NAND_EVTER_STAT_FTOER) {
  81                 puts("flash time out error\n");
  82                 for (;;)
  83                         ;
  84         }
  85
  86         for (i = bufnum / 4; i <= bufnum_end / 4; i++)
  87                 eccstat[i] = ifc_in32(&ifc->ifc_nand.nand_eccstat[i]);
  88
  89         for (i = bufnum; i <= bufnum_end; i++) {
  90                 if (check_read_ecc(buf, eccstat, i, page_size))
  91                         break;
  92         }
  93
  94         ifc_out32(&ifc->ifc_nand.nand_evter_stat, status);
  95 }
  96
  97 static inline int bad_block(uchar *marker, int port_size)
  98 {
  99         if (port_size == 8)
 100                 return __raw_readb(marker) != 0xff;
 101         else
 102                 return __raw_readw((u16 *)marker) != 0xffff;
 103 }
 104
 105 int nand_spl_load_image(uint32_t offs, unsigned int uboot_size, void *vdst)
 106 {
 107         struct fsl_ifc_fcm *gregs = (void *)CONFIG_SYS_IFC_ADDR;
 108         struct fsl_ifc_runtime *ifc = NULL;
 109         uchar *buf = (uchar *)CONFIG_SYS_NAND_BASE;
 110         int page_size;
 111         int port_size;
 112         int pages_per_blk;
 113         int blk_size;
 114         int bad_marker = 0;
 115         int bufnum_mask, bufnum, ver = 0;
 116
 117         int csor, cspr;
 118         int pos = 0;
 119         int j = 0;
 120
 121         int sram_addr;
 122         int pg_no;
 123         uchar *dst = vdst;
 124
 125         ifc = runtime_regs_address();
 126
 127         /* Get NAND Flash configuration */
 128         csor = CONFIG_SYS_NAND_CSOR;
 129         cspr = CONFIG_SYS_NAND_CSPR;
 130
 131         port_size = (cspr & CSPR_PORT_SIZE_16) ? 16 : 8;
 132
 133         if ((csor & CSOR_NAND_PGS_MASK) == CSOR_NAND_PGS_8K) {
 134                 page_size = 8192;
 135                 bufnum_mask = 0x0;
 136         } else if ((csor & CSOR_NAND_PGS_MASK) == CSOR_NAND_PGS_4K) {
 137                 page_size = 4096;
 138                 bufnum_mask = 0x1;
 139         } else if ((csor & CSOR_NAND_PGS_MASK) == CSOR_NAND_PGS_2K) {
 140                 page_size = 2048;
 141                 bufnum_mask = 0x3;
 142         } else {
 143                 page_size = 512;
 144                 bufnum_mask = 0xf;
 145
 146                 if (port_size == 8)
 147                         bad_marker = 5;
 148         }
 149
 150         ver = ifc_in32(&gregs->ifc_rev);
 151         if (ver >= FSL_IFC_V2_0_0)
 152                 bufnum_mask = (bufnum_mask * 2) + 1;
 153
 154         pages_per_blk =
 155                 32 << ((csor & CSOR_NAND_PB_MASK) >> CSOR_NAND_PB_SHIFT);
 156
 157         blk_size = pages_per_blk * page_size;
 158
 159         /* Open Full SRAM mapping for spare are access */
 160         ifc_out32(&ifc->ifc_nand.ncfgr, 0x0);
 161
 162         /* Clear Boot events */
 163         ifc_out32(&ifc->ifc_nand.nand_evter_stat, 0xffffffff);
 164
 165         /* Program FIR/FCR for Large/Small page */
 166         if (page_size > 512) {
 167                 ifc_out32(&ifc->ifc_nand.nand_fir0,
 168                           (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 169                           (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
 170                           (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP2_SHIFT) |
 171                           (IFC_FIR_OP_CMD1 << IFC_NAND_FIR0_OP3_SHIFT) |
 172                           (IFC_FIR_OP_BTRD << IFC_NAND_FIR0_OP4_SHIFT));
 173                 ifc_out32(&ifc->ifc_nand.nand_fir1, 0x0);
 174
 175                 ifc_out32(&ifc->ifc_nand.nand_fcr0,
 176                           (NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT) |
 177                           (NAND_CMD_READSTART << IFC_NAND_FCR0_CMD1_SHIFT));
 178         } else {
 179                 ifc_out32(&ifc->ifc_nand.nand_fir0,
 180                           (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 181                           (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
 182                           (IFC_FIR_OP_RA0  << IFC_NAND_FIR0_OP2_SHIFT) |
 183                           (IFC_FIR_OP_BTRD << IFC_NAND_FIR0_OP3_SHIFT));
 184                 ifc_out32(&ifc->ifc_nand.nand_fir1, 0x0);
 185
 186                 ifc_out32(&ifc->ifc_nand.nand_fcr0,
 187                           NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT);
 188         }
 189
 190         /* Program FBCR = 0 for full page read */
 191         ifc_out32(&ifc->ifc_nand.nand_fbcr, 0);
 192
 193         /* Read and copy u-boot on SDRAM from NAND device, In parallel
 194          * check for Bad block if found skip it and read continue to
 195          * next Block
 196          */
 197         while (pos < uboot_size) {
 198                 int i = 0;
 199                 do {
 200                         pg_no = offs / page_size;
 201                         bufnum = pg_no & bufnum_mask;
 202                         sram_addr = bufnum * page_size * 2;
 203
 204                         ifc_out32(&ifc->ifc_nand.row0, pg_no);
 205                         ifc_out32(&ifc->ifc_nand.col0, 0);
 206                         /* start read */
 207                         ifc_out32(&ifc->ifc_nand.nandseq_strt,
 208                                   IFC_NAND_SEQ_STRT_FIR_STRT);
 209
 210                         /* wait for read to complete */
 211                         nand_wait(&buf[sram_addr], bufnum, page_size);
 212
 213                         /*
 214                          * If either of the first two pages are marked bad,
 215                          * continue to the next block.
 216                          */
 217                         if (i++ < 2 &&
 218                             bad_block(&buf[sram_addr + page_size + bad_marker],
 219                                       port_size)) {
 220                                 puts("skipping\n");
 221                                 offs = (offs + blk_size) & ~(blk_size - 1);
 222                                 pos &= ~(blk_size - 1);
 223                                 break;
 224                         }
 225
 226                         for (j = 0; j < page_size; j++)
 227                                 dst[pos + j] = __raw_readb(&buf[sram_addr + j]);
 228
 229                         pos += page_size;
 230                         offs += page_size;
 231                 } while ((offs & (blk_size - 1)) && (pos < uboot_size));
 232         }
 233
 234         return 0;
 235 }
 236
 237 /*
 238  * Main entrypoint for NAND Boot. It's necessary that SDRAM is already
 239  * configured and available since this code loads the main U-Boot image
 240  * from NAND into SDRAM and starts from there.
 241  */
 242 void nand_boot(void)
 243 {
 244         __attribute__((noreturn)) void (*uboot)(void);
 245         /*
 246          * Load U-Boot image from NAND into RAM
 247          */
 248         nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
 249                             CONFIG_SYS_NAND_U_BOOT_SIZE,
 250                             (uchar *)CONFIG_SYS_NAND_U_BOOT_DST);
 251
 252 #ifdef CONFIG_NAND_ENV_DST
 253         nand_spl_load_image(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
 254                             (uchar *)CONFIG_NAND_ENV_DST);
 255
 256 #ifdef CONFIG_ENV_OFFSET_REDUND
 257         nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND, CONFIG_ENV_SIZE,
 258                             (uchar *)CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE);
 259 #endif
 260 #endif
 261         /*
 262          * Jump to U-Boot image
 263          */
 264 #ifdef CONFIG_SPL_FLUSH_IMAGE
 265         /*
 266          * Clean d-cache and invalidate i-cache, to
 267          * make sure that no stale data is executed.
 268          */
 269         flush_cache(CONFIG_SYS_NAND_U_BOOT_DST, CONFIG_SYS_NAND_U_BOOT_SIZE);
 270 #endif
 271         uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
 272         uboot();
 273 }
 274
 275 #ifndef CONFIG_SPL_NAND_INIT
 276 void nand_init(void)
 277 {
 278 }
 279
 280 void nand_deselect(void)
 281 {
 282 }
 283 #endif