drivers/mtd/spi-nor/sst.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2005, Intec Automation Inc.
   4  * Copyright (C) 2014, Freescale Semiconductor, Inc.
   5  */
   6
   7 #include <linux/mtd/spi-nor.h>
   8
   9 #include "core.h"
  10
  11 /* SST flash_info mfr_flag. Used to specify SST byte programming. */
  12 #define SST_WRITE               BIT(0)
  13
  14 #define SST26VF_CR_BPNV         BIT(3)
  15
  16 static int sst26vf_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
  17 {
  18         return -EOPNOTSUPP;
  19 }
  20
  21 static int sst26vf_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
  22 {
  23         int ret;
  24
  25         /* We only support unlocking the entire flash array. */
  26         if (ofs != 0 || len != nor->params->size)
  27                 return -EINVAL;
  28
  29         ret = spi_nor_read_cr(nor, nor->bouncebuf);
  30         if (ret)
  31                 return ret;
  32
  33         if (!(nor->bouncebuf[0] & SST26VF_CR_BPNV)) {
  34                 dev_dbg(nor->dev, "Any block has been permanently locked\n");
  35                 return -EINVAL;
  36         }
  37
  38         return spi_nor_global_block_unlock(nor);
  39 }
  40
  41 static int sst26vf_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len)
  42 {
  43         return -EOPNOTSUPP;
  44 }
  45
  46 static const struct spi_nor_locking_ops sst26vf_locking_ops = {
  47         .lock = sst26vf_lock,
  48         .unlock = sst26vf_unlock,
  49         .is_locked = sst26vf_is_locked,
  50 };
  51
  52 static void sst26vf_late_init(struct spi_nor *nor)
  53 {
  54         nor->params->locking_ops = &sst26vf_locking_ops;
  55 }
  56
  57 static const struct spi_nor_fixups sst26vf_fixups = {
  58         .late_init = sst26vf_late_init,
  59 };
  60
  61 static const struct flash_info sst_parts[] = {
  62         /* SST -- large erase sizes are "overlays", "sectors" are 4K */
  63         { "sst25vf040b", INFO(0xbf258d, 0, 64 * 1024,  8)
  64                 FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
  65                 NO_SFDP_FLAGS(SECT_4K)
  66                 MFR_FLAGS(SST_WRITE) },
  67         { "sst25vf080b", INFO(0xbf258e, 0, 64 * 1024, 16)
  68                 FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
  69                 NO_SFDP_FLAGS(SECT_4K)
  70                 MFR_FLAGS(SST_WRITE) },
  71         { "sst25vf016b", INFO(0xbf2541, 0, 64 * 1024, 32)
  72                 FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
  73                 NO_SFDP_FLAGS(SECT_4K)
  74                 MFR_FLAGS(SST_WRITE) },
  75         { "sst25vf032b", INFO(0xbf254a, 0, 64 * 1024, 64)
  76                 FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
  77                 NO_SFDP_FLAGS(SECT_4K)
  78                 MFR_FLAGS(SST_WRITE) },
  79         { "sst25vf064c", INFO(0xbf254b, 0, 64 * 1024, 128)
  80                 FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_4BIT_BP |
  81                       SPI_NOR_SWP_IS_VOLATILE)
  82                 NO_SFDP_FLAGS(SECT_4K) },
  83         { "sst25wf512",  INFO(0xbf2501, 0, 64 * 1024,  1)
  84                 FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
  85                 NO_SFDP_FLAGS(SECT_4K)
  86                 MFR_FLAGS(SST_WRITE) },
  87         { "sst25wf010",  INFO(0xbf2502, 0, 64 * 1024,  2)
  88                 FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
  89                 NO_SFDP_FLAGS(SECT_4K)
  90                 MFR_FLAGS(SST_WRITE) },
  91         { "sst25wf020",  INFO(0xbf2503, 0, 64 * 1024,  4)
  92                 FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
  93                 NO_SFDP_FLAGS(SECT_4K)
  94                 MFR_FLAGS(SST_WRITE) },
  95         { "sst25wf020a", INFO(0x621612, 0, 64 * 1024,  4)
  96                 FLAGS(SPI_NOR_HAS_LOCK)
  97                 NO_SFDP_FLAGS(SECT_4K) },
  98         { "sst25wf040b", INFO(0x621613, 0, 64 * 1024,  8)
  99                 FLAGS(SPI_NOR_HAS_LOCK)
 100                 NO_SFDP_FLAGS(SECT_4K) },
 101         { "sst25wf040",  INFO(0xbf2504, 0, 64 * 1024,  8)
 102                 FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
 103                 NO_SFDP_FLAGS(SECT_4K)
 104                 MFR_FLAGS(SST_WRITE) },
 105         { "sst25wf080",  INFO(0xbf2505, 0, 64 * 1024, 16)
 106                 FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
 107                 NO_SFDP_FLAGS(SECT_4K)
 108                 MFR_FLAGS(SST_WRITE) },
 109         { "sst26wf016b", INFO(0xbf2651, 0, 64 * 1024, 32)
 110                 NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ |
 111                               SPI_NOR_QUAD_READ) },
 112         { "sst26vf016b", INFO(0xbf2641, 0, 64 * 1024, 32)
 113                 NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ) },
 114         { "sst26vf064b", INFO(0xbf2643, 0, 64 * 1024, 128)
 115                 FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
 116                 NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)
 117                 .fixups = &sst26vf_fixups },
 118 };
 119
 120 static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
 121                      size_t *retlen, const u_char *buf)
 122 {
 123         struct spi_nor *nor = mtd_to_spi_nor(mtd);
 124         size_t actual = 0;
 125         int ret;
 126
 127         dev_dbg(nor->dev, "to 0x%08x, len %zd\n", (u32)to, len);
 128
 129         ret = spi_nor_lock_and_prep(nor);
 130         if (ret)
 131                 return ret;
 132
 133         ret = spi_nor_write_enable(nor);
 134         if (ret)
 135                 goto out;
 136
 137         nor->sst_write_second = false;
 138
 139         /* Start write from odd address. */
 140         if (to % 2) {
 141                 nor->program_opcode = SPINOR_OP_BP;
 142
 143                 /* write one byte. */
 144                 ret = spi_nor_write_data(nor, to, 1, buf);
 145                 if (ret < 0)
 146                         goto out;
 147                 WARN(ret != 1, "While writing 1 byte written %i bytes\n", ret);
 148                 ret = spi_nor_wait_till_ready(nor);
 149                 if (ret)
 150                         goto out;
 151
 152                 to++;
 153                 actual++;
 154         }
 155
 156         /* Write out most of the data here. */
 157         for (; actual < len - 1; actual += 2) {
 158                 nor->program_opcode = SPINOR_OP_AAI_WP;
 159
 160                 /* write two bytes. */
 161                 ret = spi_nor_write_data(nor, to, 2, buf + actual);
 162                 if (ret < 0)
 163                         goto out;
 164                 WARN(ret != 2, "While writing 2 bytes written %i bytes\n", ret);
 165                 ret = spi_nor_wait_till_ready(nor);
 166                 if (ret)
 167                         goto out;
 168                 to += 2;
 169                 nor->sst_write_second = true;
 170         }
 171         nor->sst_write_second = false;
 172
 173         ret = spi_nor_write_disable(nor);
 174         if (ret)
 175                 goto out;
 176
 177         ret = spi_nor_wait_till_ready(nor);
 178         if (ret)
 179                 goto out;
 180
 181         /* Write out trailing byte if it exists. */
 182         if (actual != len) {
 183                 ret = spi_nor_write_enable(nor);
 184                 if (ret)
 185                         goto out;
 186
 187                 nor->program_opcode = SPINOR_OP_BP;
 188                 ret = spi_nor_write_data(nor, to, 1, buf + actual);
 189                 if (ret < 0)
 190                         goto out;
 191                 WARN(ret != 1, "While writing 1 byte written %i bytes\n", ret);
 192                 ret = spi_nor_wait_till_ready(nor);
 193                 if (ret)
 194                         goto out;
 195
 196                 actual += 1;
 197
 198                 ret = spi_nor_write_disable(nor);
 199         }
 200 out:
 201         *retlen += actual;
 202         spi_nor_unlock_and_unprep(nor);
 203         return ret;
 204 }
 205
 206 static void sst_late_init(struct spi_nor *nor)
 207 {
 208         if (nor->info->mfr_flags & SST_WRITE)
 209                 nor->mtd._write = sst_write;
 210 }
 211
 212 static const struct spi_nor_fixups sst_fixups = {
 213         .late_init = sst_late_init,
 214 };
 215
 216 const struct spi_nor_manufacturer spi_nor_sst = {
 217         .name = "sst",
 218         .parts = sst_parts,
 219         .nparts = ARRAY_SIZE(sst_parts),
 220         .fixups = &sst_fixups,
 221 };