drivers/mtd/devices/m25p80.c

   1 /*
   2  * MTD SPI driver for ST M25Pxx (and similar) serial flash chips
   3  *
   4  * Author: Mike Lavender, mike@steroidmicros.com
   5  *
   6  * Copyright (c) 2005, Intec Automation Inc.
   7  *
   8  * Some parts are based on lart.c by Abraham Van Der Merwe
   9  *
  10  * Cleaned up and generalized based on mtd_dataflash.c
  11  *
  12  * This code is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  *
  16  */
  17
  18 #include <linux/err.h>
  19 #include <linux/errno.h>
  20 #include <linux/module.h>
  21 #include <linux/device.h>
  22
  23 #include <linux/mtd/mtd.h>
  24 #include <linux/mtd/partitions.h>
  25
  26 #include <linux/spi/spi.h>
  27 #include <linux/spi/flash.h>
  28 #include <linux/mtd/spi-nor.h>
  29
  30 #define MAX_CMD_SIZE            6
  31 struct m25p {
  32         struct spi_device       *spi;
  33         struct spi_nor          spi_nor;
  34         struct mtd_info         mtd;
  35         u8                      command[MAX_CMD_SIZE];
  36 };
  37
  38 static int m25p80_read_reg(struct spi_nor *nor, u8 code, u8 *val, int len)
  39 {
  40         struct m25p *flash = nor->priv;
  41         struct spi_device *spi = flash->spi;
  42         int ret;
  43
  44         ret = spi_write_then_read(spi, &code, 1, val, len);
  45         if (ret < 0)
  46                 dev_err(&spi->dev, "error %d reading %x\n", ret, code);
  47
  48         return ret;
  49 }
  50
  51 static void m25p_addr2cmd(struct spi_nor *nor, unsigned int addr, u8 *cmd)
  52 {
  53         /* opcode is in cmd[0] */
  54         cmd[1] = addr >> (nor->addr_width * 8 -  8);
  55         cmd[2] = addr >> (nor->addr_width * 8 - 16);
  56         cmd[3] = addr >> (nor->addr_width * 8 - 24);
  57         cmd[4] = addr >> (nor->addr_width * 8 - 32);
  58 }
  59
  60 static int m25p_cmdsz(struct spi_nor *nor)
  61 {
  62         return 1 + nor->addr_width;
  63 }
  64
  65 static int m25p80_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len,
  66                         int wr_en)
  67 {
  68         struct m25p *flash = nor->priv;
  69         struct spi_device *spi = flash->spi;
  70
  71         flash->command[0] = opcode;
  72         if (buf)
  73                 memcpy(&flash->command[1], buf, len);
  74
  75         return spi_write(spi, flash->command, len + 1);
  76 }
  77
  78 static void m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
  79                         size_t *retlen, const u_char *buf)
  80 {
  81         struct m25p *flash = nor->priv;
  82         struct spi_device *spi = flash->spi;
  83         struct spi_transfer t[2] = {};
  84         struct spi_message m;
  85         int cmd_sz = m25p_cmdsz(nor);
  86
  87         spi_message_init(&m);
  88
  89         if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)
  90                 cmd_sz = 1;
  91
  92         flash->command[0] = nor->program_opcode;
  93         m25p_addr2cmd(nor, to, flash->command);
  94
  95         t[0].tx_buf = flash->command;
  96         t[0].len = cmd_sz;
  97         spi_message_add_tail(&t[0], &m);
  98
  99         t[1].tx_buf = buf;
 100         t[1].len = len;
 101         spi_message_add_tail(&t[1], &m);
 102
 103         spi_sync(spi, &m);
 104
 105         *retlen += m.actual_length - cmd_sz;
 106 }
 107
 108 static inline unsigned int m25p80_rx_nbits(struct spi_nor *nor)
 109 {
 110         switch (nor->flash_read) {
 111         case SPI_NOR_DUAL:
 112                 return 2;
 113         case SPI_NOR_QUAD:
 114                 return 4;
 115         default:
 116                 return 0;
 117         }
 118 }
 119
 120 /*
 121  * Read an address range from the nor chip.  The address range
 122  * may be any size provided it is within the physical boundaries.
 123  */
 124 static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
 125                         size_t *retlen, u_char *buf)
 126 {
 127         struct m25p *flash = nor->priv;
 128         struct spi_device *spi = flash->spi;
 129         struct spi_transfer t[2];
 130         struct spi_message m;
 131         unsigned int dummy = nor->read_dummy;
 132
 133         /* convert the dummy cycles to the number of bytes */
 134         dummy /= 8;
 135
 136         spi_message_init(&m);
 137         memset(t, 0, (sizeof t));
 138
 139         flash->command[0] = nor->read_opcode;
 140         m25p_addr2cmd(nor, from, flash->command);
 141
 142         t[0].tx_buf = flash->command;
 143         t[0].len = m25p_cmdsz(nor) + dummy;
 144         spi_message_add_tail(&t[0], &m);
 145
 146         t[1].rx_buf = buf;
 147         t[1].rx_nbits = m25p80_rx_nbits(nor);
 148         t[1].len = len;
 149         spi_message_add_tail(&t[1], &m);
 150
 151         spi_sync(spi, &m);
 152
 153         *retlen = m.actual_length - m25p_cmdsz(nor) - dummy;
 154         return 0;
 155 }
 156
 157 static int m25p80_erase(struct spi_nor *nor, loff_t offset)
 158 {
 159         struct m25p *flash = nor->priv;
 160
 161         dev_dbg(nor->dev, "%dKiB at 0x%08x\n",
 162                 flash->mtd.erasesize / 1024, (u32)offset);
 163
 164         /* Set up command buffer. */
 165         flash->command[0] = nor->erase_opcode;
 166         m25p_addr2cmd(nor, offset, flash->command);
 167
 168         spi_write(flash->spi, flash->command, m25p_cmdsz(nor));
 169
 170         return 0;
 171 }
 172
 173 /*
 174  * board specific setup should have ensured the SPI clock used here
 175  * matches what the READ command supports, at least until this driver
 176  * understands FAST_READ (for clocks over 25 MHz).
 177  */
 178 static int m25p_probe(struct spi_device *spi)
 179 {
 180         struct mtd_part_parser_data     ppdata;
 181         struct flash_platform_data      *data;
 182         struct m25p *flash;
 183         struct spi_nor *nor;
 184         enum read_mode mode = SPI_NOR_NORMAL;
 185         char *flash_name = NULL;
 186         int ret;
 187
 188         data = dev_get_platdata(&spi->dev);
 189
 190         flash = devm_kzalloc(&spi->dev, sizeof(*flash), GFP_KERNEL);
 191         if (!flash)
 192                 return -ENOMEM;
 193
 194         nor = &flash->spi_nor;
 195
 196         /* install the hooks */
 197         nor->read = m25p80_read;
 198         nor->write = m25p80_write;
 199         nor->erase = m25p80_erase;
 200         nor->write_reg = m25p80_write_reg;
 201         nor->read_reg = m25p80_read_reg;
 202
 203         nor->dev = &spi->dev;
 204         nor->mtd = &flash->mtd;
 205         nor->priv = flash;
 206
 207         spi_set_drvdata(spi, flash);
 208         flash->mtd.priv = nor;
 209         flash->spi = spi;
 210
 211         if (spi->mode & SPI_RX_QUAD)
 212                 mode = SPI_NOR_QUAD;
 213         else if (spi->mode & SPI_RX_DUAL)
 214                 mode = SPI_NOR_DUAL;
 215
 216         if (data && data->name)
 217                 flash->mtd.name = data->name;
 218
 219         /* For some (historical?) reason many platforms provide two different
 220          * names in flash_platform_data: "name" and "type". Quite often name is
 221          * set to "m25p80" and then "type" provides a real chip name.
 222          * If that's the case, respect "type" and ignore a "name".
 223          */
 224         if (data && data->type)
 225                 flash_name = data->type;
 226         else if (!strcmp(spi->modalias, "spi-nor"))
 227                 flash_name = NULL; /* auto-detect */
 228         else
 229                 flash_name = spi->modalias;
 230
 231         ret = spi_nor_scan(nor, flash_name, mode);
 232         if (ret)
 233                 return ret;
 234
 235         ppdata.of_node = spi->dev.of_node;
 236
 237         return mtd_device_parse_register(&flash->mtd, NULL, &ppdata,
 238                         data ? data->parts : NULL,
 239                         data ? data->nr_parts : 0);
 240 }
 241
 242
 243 static int m25p_remove(struct spi_device *spi)
 244 {
 245         struct m25p     *flash = spi_get_drvdata(spi);
 246
 247         /* Clean up MTD stuff. */
 248         return mtd_device_unregister(&flash->mtd);
 249 }
 250
 251 /*
 252  * Do NOT add to this array without reading the following:
 253  *
 254  * Historically, many flash devices are bound to this driver by their name. But
 255  * since most of these flash are compatible to some extent, and their
 256  * differences can often be differentiated by the JEDEC read-ID command, we
 257  * encourage new users to add support to the spi-nor library, and simply bind
 258  * against a generic string here (e.g., "jedec,spi-nor").
 259  *
 260  * Many flash names are kept here in this list (as well as in spi-nor.c) to
 261  * keep them available as module aliases for existing platforms.
 262  */
 263 static const struct spi_device_id m25p_ids[] = {
 264         {"at25fs010"},  {"at25fs040"},  {"at25df041a"}, {"at25df321a"},
 265         {"at25df641"},  {"at26f004"},   {"at26df081a"}, {"at26df161a"},
 266         {"at26df321"},  {"at45db081d"},
 267         {"en25f32"},    {"en25p32"},    {"en25q32b"},   {"en25p64"},
 268         {"en25q64"},    {"en25qh128"},  {"en25qh256"},
 269         {"f25l32pa"},
 270         {"mr25h256"},   {"mr25h10"},
 271         {"gd25q32"},    {"gd25q64"},
 272         {"160s33b"},    {"320s33b"},    {"640s33b"},
 273         {"mx25l2005a"}, {"mx25l4005a"}, {"mx25l8005"},  {"mx25l1606e"},
 274         {"mx25l3205d"}, {"mx25l3255e"}, {"mx25l6405d"}, {"mx25l12805d"},
 275         {"mx25l12855e"},{"mx25l25635e"},{"mx25l25655e"},{"mx66l51235l"},
 276         {"mx66l1g55g"},
 277         {"n25q064"},    {"n25q128a11"}, {"n25q128a13"}, {"n25q256a"},
 278         {"n25q512a"},   {"n25q512ax3"}, {"n25q00"},
 279         {"pm25lv512"},  {"pm25lv010"},  {"pm25lq032"},
 280         {"s25sl032p"},  {"s25sl064p"},  {"s25fl256s0"}, {"s25fl256s1"},
 281         {"s25fl512s"},  {"s70fl01gs"},  {"s25sl12800"}, {"s25sl12801"},
 282         {"s25fl129p0"}, {"s25fl129p1"}, {"s25sl004a"},  {"s25sl008a"},
 283         {"s25sl016a"},  {"s25sl032a"},  {"s25sl064a"},  {"s25fl008k"},
 284         {"s25fl016k"},  {"s25fl064k"},  {"s25fl132k"},
 285         {"sst25vf040b"},{"sst25vf080b"},{"sst25vf016b"},{"sst25vf032b"},
 286         {"sst25vf064c"},{"sst25wf512"}, {"sst25wf010"}, {"sst25wf020"},
 287         {"sst25wf040"},
 288         {"m25p05"},     {"m25p10"},     {"m25p20"},     {"m25p40"},
 289         {"m25p80"},     {"m25p16"},     {"m25p32"},     {"m25p64"},
 290         {"m25p128"},    {"n25q032"},
 291         {"m25p05-nonjedec"},    {"m25p10-nonjedec"},    {"m25p20-nonjedec"},
 292         {"m25p40-nonjedec"},    {"m25p80-nonjedec"},    {"m25p16-nonjedec"},
 293         {"m25p32-nonjedec"},    {"m25p64-nonjedec"},    {"m25p128-nonjedec"},
 294         {"m45pe10"},    {"m45pe80"},    {"m45pe16"},
 295         {"m25pe20"},    {"m25pe80"},    {"m25pe16"},
 296         {"m25px16"},    {"m25px32"},    {"m25px32-s0"}, {"m25px32-s1"},
 297         {"m25px64"},    {"m25px80"},
 298         {"w25x10"},     {"w25x20"},     {"w25x40"},     {"w25x80"},
 299         {"w25x16"},     {"w25x32"},     {"w25q32"},     {"w25q32dw"},
 300         {"w25x64"},     {"w25q64"},     {"w25q80"},     {"w25q80bl"},
 301         {"w25q128"},    {"w25q256"},    {"cat25c11"},
 302         {"cat25c03"},   {"cat25c09"},   {"cat25c17"},   {"cat25128"},
 303
 304         /*
 305          * Generic support for SPI NOR that can be identified by the JEDEC READ
 306          * ID opcode (0x9F). Use this, if possible.
 307          */
 308         {"spi-nor"},
 309         { },
 310 };
 311 MODULE_DEVICE_TABLE(spi, m25p_ids);
 312
 313 static struct spi_driver m25p80_driver = {
 314         .driver = {
 315                 .name   = "m25p80",
 316                 .owner  = THIS_MODULE,
 317         },
 318         .id_table       = m25p_ids,
 319         .probe  = m25p_probe,
 320         .remove = m25p_remove,
 321
 322         /* REVISIT: many of these chips have deep power-down modes, which
 323          * should clearly be entered on suspend() to minimize power use.
 324          * And also when they're otherwise idle...
 325          */
 326 };
 327
 328 module_spi_driver(m25p80_driver);
 329
 330 MODULE_LICENSE("GPL");
 331 MODULE_AUTHOR("Mike Lavender");
 332 MODULE_DESCRIPTION("MTD SPI driver for ST M25Pxx flash chips");