1 files changed, 112 insertions, 5 deletions

diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
index b35e4813a3a5..acc3728872e3 100644
--- a/drivers/mtd/devices/mtd_dataflash.c
+++ b/drivers/mtd/devices/mtd_dataflash.c
@@ -487,7 +487,9 @@ add_dataflash(struct spi_device *spi, char *name,
         device->write = dataflash_write;
         device->priv = priv;
 
-        dev_info(&spi->dev, "%s (%d KBytes)\n", name, device->size/1024);
+        dev_info(&spi->dev, "%s (%d KBytes) pagesize %d bytes, "
+                "erasesize %d bytes\n", name, device->size/1024,
+                 pagesize, pagesize * 8);       /* 8 pages = 1 block */
         dev_set_drvdata(&spi->dev, priv);
 
         if (mtd_has_partitions()) {
@@ -521,7 +523,7 @@ add_dataflash(struct spi_device *spi, char *name,
  *
  *   Device      Density         ID code          #Pages PageSize  Offset
  *   AT45DB011B  1Mbit   (128K)  xx0011xx (0x0c)    512    264      9
- *   AT45DB021B  2Mbit   (256K)  xx0101xx (0x14)   1025    264      9
+ *   AT45DB021B  2Mbit   (256K)  xx0101xx (0x14)   1024    264      9
  *   AT45DB041B  4Mbit   (512K)  xx0111xx (0x1c)   2048    264      9
  *   AT45DB081B  8Mbit   (1M)    xx1001xx (0x24)   4096    264      9
  *   AT45DB0161B 16Mbit  (2M)    xx1011xx (0x2c)   4096    528     10
@@ -529,9 +531,114 @@ add_dataflash(struct spi_device *spi, char *name,
  *   AT45DB0642  64Mbit  (8M)    xx111xxx (0x3c)   8192   1056     11
  *   AT45DB1282  128Mbit (16M)   xx0100xx (0x10)  16384   1056     11
  */
+
+struct flash_info {
+        char            *name;
+
+        /* JEDEC id zero means "no ID" (most older chips); otherwise it has
+         * a high byte of zero plus three data bytes: the manufacturer id,
+         * then a two byte device id.
+         */
+        u32             jedec_id;
+
+        /* The size listed here is what works with OPCODE_SE, which isn't
+         * necessarily called a "sector" by the vendor.
+         */
+        unsigned        nr_pages;
+        u16             pagesize;
+        u16             pageoffset;
+
+        u16             flags;
+#define SUP_POW2PS      0x02
+#define IS_POW2PS       0x01
+};
+
+static struct flash_info __devinitdata dataflash_data [] = {
+
+        { "at45db011d",  0x1f2200, 512, 264, 9, SUP_POW2PS},
+        { "at45db011d",  0x1f2200, 512, 256, 8, SUP_POW2PS | IS_POW2PS},
+
+        { "at45db021d",  0x1f2300, 1024, 264, 9, SUP_POW2PS},
+        { "at45db021d",  0x1f2300, 1024, 256, 8, SUP_POW2PS | IS_POW2PS},
+
+        { "at45db041d",  0x1f2400, 2048, 264, 9, SUP_POW2PS},
+        { "at45db041d",  0x1f2400, 2048, 256, 8, SUP_POW2PS | IS_POW2PS},
+
+        { "at45db081d",  0x1f2500, 4096, 264, 9, SUP_POW2PS},
+        { "at45db081d",  0x1f2500, 4096, 256, 8, SUP_POW2PS | IS_POW2PS},
+
+        { "at45db161d",  0x1f2600, 4096, 528, 10, SUP_POW2PS},
+        { "at45db161d",  0x1f2600, 4096, 512, 9, SUP_POW2PS | IS_POW2PS},
+
+        { "at45db321c",  0x1f2700, 8192, 528, 10, },
+
+        { "at45db321d",  0x1f2701, 8192, 528, 10, SUP_POW2PS},
+        { "at45db321d",  0x1f2701, 8192, 512, 9, SUP_POW2PS | IS_POW2PS},
+
+        { "at45db641d",  0x1f2800, 8192, 1056, 11, SUP_POW2PS},
+        { "at45db641d",  0x1f2800, 8192, 1024, 10, SUP_POW2PS | IS_POW2PS},
+};
+
+static struct flash_info *__devinit jedec_probe(struct spi_device *spi)
+{
+        int                     tmp;
+        u8                      code = OP_READ_ID;
+        u8                      id[3];
+        u32                     jedec;
+        struct flash_info       *info;
+        int status;
+
+
+        /* JEDEC also defines an optional "extended device information"
+         * string for after vendor-specific data, after the three bytes
+         * we use here.  Supporting some chips might require using it.
+         */
+        tmp = spi_write_then_read(spi, &code, 1, id, 3);
+        if (tmp < 0) {
+                DEBUG(MTD_DEBUG_LEVEL0, "%s: error %d reading JEDEC ID\n",
+                        spi->dev.bus_id, tmp);
+                return NULL;
+        }
+        jedec = id[0];
+        jedec = jedec << 8;
+        jedec |= id[1];
+        jedec = jedec << 8;
+        jedec |= id[2];
+
+        for (tmp = 0, info = dataflash_data;
+                        tmp < ARRAY_SIZE(dataflash_data);
+                        tmp++, info++) {
+                if (info->jedec_id == jedec) {
+                        if (info->flags & SUP_POW2PS) {
+                                status = dataflash_status(spi);
+                                if (status & 0x1)
+                                        /* return power of 2 pagesize */
+                                        return ++info;
+                                else
+                                        return info;
+                        }
+                }
+        }
+        return NULL;
+}
+
 static int __devinit dataflash_probe(struct spi_device *spi)
 {
         int status;
+        struct flash_info       *info;
+
+        /*
+         * Try to detect dataflash by JEDEC ID.
+         * If it succeeds we know we have either a C or D part.
+         * D will support power of 2 pagesize option.
+         */
+
+        info = jedec_probe(spi);
+
+        if (info != NULL)
+                return add_dataflash(spi, info->name, info->nr_pages,
+                                 info->pagesize, info->pageoffset);
+
 
         status = dataflash_status(spi);
         if (status <= 0 || status == 0xff) {
@@ -551,16 +658,16 @@ static int __devinit dataflash_probe(struct spi_device *spi)
                 status = add_dataflash(spi, "AT45DB011B", 512, 264, 9);
                 break;
         case 0x14:      /* 0 1 0 1 x x */
-                status = add_dataflash(spi, "AT45DB021B", 1025, 264, 9);
+                status = add_dataflash(spi, "AT45DB021B", 1024, 264, 9);
                 break;
         case 0x1c:      /* 0 1 1 1 x x */
-                status = add_dataflash(spi, "AT45DB041x", 2048, 264, 9);
+                status = add_dataflash(spi, "AT45DB041B", 2048, 264, 9);
                 break;
         case 0x24:      /* 1 0 0 1 x x */
                 status = add_dataflash(spi, "AT45DB081B", 4096, 264, 9);
                 break;
         case 0x2c:      /* 1 0 1 1 x x */
-                status = add_dataflash(spi, "AT45DB161x", 4096, 528, 10);
+                status = add_dataflash(spi, "AT45DB161B", 4096, 528, 10);
                 break;
         case 0x34:      /* 1 1 0 1 x x */
                 status = add_dataflash(spi, "AT45DB321x", 8192, 528, 10);