Skip to content

Commit

Permalink
---
Browse files Browse the repository at this point in the history 
yaml
---
r: 107279
b: refs/heads/master
c: 771999b
h: refs/heads/master
i:
  107277: 47ad558
  107275: 82f4a90
  107271: 1836e7c
  107263: 774d78c
v: v3
  • Loading branch information
akpm@linux-foundation.org authored and David Woodhouse committed Jul 30, 2008
1 parent 4655a7e commit 8dee7cb
Show file tree
Hide file tree
Showing 2 changed files with 84 additions and 48 deletions.
2 changes: 1 addition & 1 deletion [refs]
View file
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 650da9d0b7c401619c1df2953e975606b8d5dcbb
refs/heads/master: 771999b65f79264acde4b855e5d35696eca5e80c
130 changes: 83 additions & 47 deletions trunk/drivers/mtd/devices/mtd_dataflash.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,8 @@
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/err.h>

#include <linux/spi/spi.h>
#include <linux/spi/flash.h>

Expand Down Expand Up @@ -487,9 +489,8 @@ add_dataflash(struct spi_device *spi, char *name,
device->write = dataflash_write;
device->priv = priv;

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_info(&spi->dev, "%s (%d KBytes) pagesize %d bytes\n",
name, DIV_ROUND_UP(device->size, 1024), pagesize);
dev_set_drvdata(&spi->dev, priv);

if (mtd_has_partitions()) {
Expand Down Expand Up @@ -518,65 +519,57 @@ add_dataflash(struct spi_device *spi, char *name,
return add_mtd_device(device) == 1 ? -ENODEV : 0;
}

/*
* Detect and initialize DataFlash device:
*
* Device Density ID code #Pages PageSize Offset
* AT45DB011B 1Mbit (128K) xx0011xx (0x0c) 512 264 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
* AT45DB0321B 32Mbit (4M) xx1101xx (0x34) 8192 528 10
* 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.
/* JEDEC id has a high byte of zero plus three data bytes:
* the manufacturer id, then a two byte device id.
*/
uint32_t jedec_id;

/* The size listed here is what works with OPCODE_SE, which isn't
* necessarily called a "sector" by the vendor.
*/
/* The size listed here is what works with OP_ERASE_PAGE. */
unsigned nr_pages;
uint16_t pagesize;
uint16_t pageoffset;

uint16_t flags;
#define SUP_POW2PS 0x02
#define IS_POW2PS 0x01
#define SUP_POW2PS 0x0002 /* supports 2^N byte pages */
#define IS_POW2PS 0x0001 /* uses 2^N byte pages */
};

static struct flash_info __devinitdata dataflash_data [] = {

{ "at45db011d", 0x1f2200, 512, 264, 9, SUP_POW2PS},
/*
* NOTE: chips with SUP_POW2PS (rev D and up) need two entries,
* one with IS_POW2PS and the other without. The entry with the
* non-2^N byte page size can't name exact chip revisions without
* losing backwards compatibility for cmdlinepart.
*
* These newer chips also support 128-byte security registers (with
* 64 bytes one-time-programmable) and software write-protection.
*/
{ "AT45DB011B", 0x1f2200, 512, 264, 9, SUP_POW2PS},
{ "at45db011d", 0x1f2200, 512, 256, 8, SUP_POW2PS | IS_POW2PS},

{ "at45db021d", 0x1f2300, 1024, 264, 9, SUP_POW2PS},
{ "AT45DB021B", 0x1f2300, 1024, 264, 9, SUP_POW2PS},
{ "at45db021d", 0x1f2300, 1024, 256, 8, SUP_POW2PS | IS_POW2PS},

{ "at45db041d", 0x1f2400, 2048, 264, 9, SUP_POW2PS},
{ "AT45DB041x", 0x1f2400, 2048, 264, 9, SUP_POW2PS},
{ "at45db041d", 0x1f2400, 2048, 256, 8, SUP_POW2PS | IS_POW2PS},

{ "at45db081d", 0x1f2500, 4096, 264, 9, SUP_POW2PS},
{ "AT45DB081B", 0x1f2500, 4096, 264, 9, SUP_POW2PS},
{ "at45db081d", 0x1f2500, 4096, 256, 8, SUP_POW2PS | IS_POW2PS},

{ "at45db161d", 0x1f2600, 4096, 528, 10, SUP_POW2PS},
{ "AT45DB161x", 0x1f2600, 4096, 528, 10, SUP_POW2PS},
{ "at45db161d", 0x1f2600, 4096, 512, 9, SUP_POW2PS | IS_POW2PS},

{ "at45db321c", 0x1f2700, 8192, 528, 10, },
{ "AT45DB321x", 0x1f2700, 8192, 528, 10, 0}, /* rev C */

{ "at45db321d", 0x1f2701, 8192, 528, 10, SUP_POW2PS},
{ "AT45DB321x", 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},
{ "AT45DB642x", 0x1f2800, 8192, 1056, 11, SUP_POW2PS},
{ "at45db642d", 0x1f2800, 8192, 1024, 10, SUP_POW2PS | IS_POW2PS},
};

static struct flash_info *__devinit jedec_probe(struct spi_device *spi)
Expand All @@ -588,17 +581,23 @@ static struct flash_info *__devinit jedec_probe(struct spi_device *spi)
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.
*
* If the vendor ID isn't Atmel's (0x1f), assume this call failed.
* That's not an error; only rev C and newer chips handle it, and
* only Atmel sells these chips.
*/
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;
return ERR_PTR(tmp);
}
if (id[0] != 0x1f)
return NULL;

jedec = id[0];
jedec = jedec << 8;
jedec |= id[1];
Expand All @@ -609,19 +608,53 @@ static struct flash_info *__devinit jedec_probe(struct spi_device *spi)
tmp < ARRAY_SIZE(dataflash_data);
tmp++, info++) {
if (info->jedec_id == jedec) {
DEBUG(MTD_DEBUG_LEVEL1, "%s: OTP, sector protect%s\n",
dev_name(&spi->dev),
(info->flags & SUP_POW2PS)
? ", binary pagesize" : ""
);
if (info->flags & SUP_POW2PS) {
status = dataflash_status(spi);
if (status & 0x1)
/* return power of 2 pagesize */
return ++info;
else
return info;
if (status < 0) {
DEBUG(MTD_DEBUG_LEVEL1,
"%s: status error %d\n",
dev_name(&spi->dev), status);
return ERR_PTR(status);
}
if (status & 0x1) {
if (info->flags & IS_POW2PS)
return info;
} else {
if (!(info->flags & IS_POW2PS))
return info;
}
}
}
}
return NULL;

/*
* Treat other chips as errors ... we won't know the right page
* size (it might be binary) even when we can tell which density
* class is involved (legacy chip id scheme).
*/
dev_warn(&spi->dev, "JEDEC id %06x not handled\n", jedec);
return ERR_PTR(-ENODEV);
}

/*
* Detect and initialize DataFlash device, using JEDEC IDs on newer chips
* or else the ID code embedded in the status bits:
*
* Device Density ID code #Pages PageSize Offset
* AT45DB011B 1Mbit (128K) xx0011xx (0x0c) 512 264 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
* AT45DB0321B 32Mbit (4M) xx1101xx (0x34) 8192 528 10
* AT45DB0642 64Mbit (8M) xx111xxx (0x3c) 8192 1056 11
* AT45DB1282 128Mbit (16M) xx0100xx (0x10) 16384 1056 11
*/
static int __devinit dataflash_probe(struct spi_device *spi)
{
int status;
Expand All @@ -632,14 +665,17 @@ static int __devinit dataflash_probe(struct spi_device *spi)
* 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 (IS_ERR(info))
return PTR_ERR(info);
if (info != NULL)
return add_dataflash(spi, info->name, info->nr_pages,
info->pagesize, info->pageoffset);


/*
* Older chips support only legacy commands, identifing
* capacity using bits in the status byte.
*/
status = dataflash_status(spi);
if (status <= 0 || status == 0xff) {
DEBUG(MTD_DEBUG_LEVEL1, "%s: status error %d\n",
Expand All @@ -661,13 +697,13 @@ static int __devinit dataflash_probe(struct spi_device *spi)
status = add_dataflash(spi, "AT45DB021B", 1024, 264, 9);
break;
case 0x1c: /* 0 1 1 1 x x */
status = add_dataflash(spi, "AT45DB041B", 2048, 264, 9);
status = add_dataflash(spi, "AT45DB041x", 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, "AT45DB161B", 4096, 528, 10);
status = add_dataflash(spi, "AT45DB161x", 4096, 528, 10);
break;
case 0x34: /* 1 1 0 1 x x */
status = add_dataflash(spi, "AT45DB321x", 8192, 528, 10);
Expand Down

0 comments on commit 8dee7cb

Please sign in to comment.