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Message-Id: <200807270325.13790.david-b@pacbell.net>
Date: Sun, 27 Jul 2008 03:25:13 -0700
From: David Brownell <david-b@...bell.net>
To: Andrew Morton <akpm@...ux-foundation.org>,
linux-mtd@...ts.infradead.org, dwmw2@...radead.org
Cc: Bryan Wu <cooloney@...nel.org>,
Michael Hennerich <michael.hennerich@...log.com>,
linux-kernel@...r.kernel.org
Subject: [RESEND x2 PATCH 2.6.26-git 1/2] MTD DataFlash: bugfix, binary page sizes now handled (v3)
From: David Brownell <dbrownell@...rs.sourceforge.net>
The wrong version of the "teach dataflash about binary density" patch
just got merged (v2 not v3) ... this restores the missing updates:
* Fix the cmdlinepart *regression* that caused testing failures (!!)
by restoring the original part labels in relevant cases.
* Don't reference things that don't exist (!)
- An opcode that doesn't even exist for DataFlash
- The part is "at45db642" not "at45db641"
- ID zero in this JEDEC table
* Make the JEDEC probe routine report and handle errors better:
- If the SPI calls fail, return the error codes.
- Don't depend on ordering of table entries.
- Unrecognized ids are different from parts that have no ID.
We won't actually know how to handle them correctly; display
the ID and ignore the chip.
* Move the original block comment about the "legacy" chip ID scheme
back next to the code to which it applies ... not next to the new
JEDEC query code, which uses an entirely different strategy.
* Don't print a guessed erasesize; /proc/mtd has the real value.
And add a few more comments.
Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
---
Refreshed against current GIT
drivers/mtd/devices/mtd_dataflash.c | 130 +++++++++++++++++++++-------------
1 file changed, 83 insertions(+), 47 deletions(-)
--- a/drivers/mtd/devices/mtd_dataflash.c 2008-07-27 01:27:21.000000000 -0700
+++ b/drivers/mtd/devices/mtd_dataflash.c 2008-07-27 02:02:39.000000000 -0700
@@ -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>
@@ -487,9 +489,8 @@ add_dataflash(struct spi_device *spi, ch
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()) {
@@ -518,65 +519,57 @@ add_dataflash(struct spi_device *spi, ch
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)
@@ -588,17 +581,23 @@ static struct flash_info *__devinit jede
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];
@@ -609,19 +608,53 @@ static struct flash_info *__devinit jede
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;
@@ -632,14 +665,17 @@ static int __devinit dataflash_probe(str
* 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",
@@ -661,13 +697,13 @@ static int __devinit dataflash_probe(str
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);
--
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