[PATCH v2 3/3] mtd: dataflash: Make use of "extened device information"
From: Andrey Smirnov
Date: Tue Apr 18 2017 - 10:22:00 EST
In anticipation of supporting chips that need it, extend the size of
struct flash_info's 'jedec_id' field to make room 2 byte of extended
device information as well as add code to fetch this data during
jedec_probe().
Cc: cphealy@xxxxxxxxx
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Cc: Brian Norris <computersforpeace@xxxxxxxxx>
Cc: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Cc: Marek Vasut <marek.vasut@xxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Cc: Cyrille Pitchen <cyrille.pitchen@xxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
Changes since [v1]:
- Formatting
[v1] http://lkml.kernel.org/r/20170411161722.11164-1-andrew.smirnov@xxxxxxxxx
drivers/mtd/devices/mtd_dataflash.c | 113 +++++++++++++++++++++---------------
1 file changed, 65 insertions(+), 48 deletions(-)
diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
index 5b7a8c3..5d694a4 100644
--- a/drivers/mtd/devices/mtd_dataflash.c
+++ b/drivers/mtd/devices/mtd_dataflash.c
@@ -690,7 +690,7 @@ struct flash_info {
/* JEDEC id has a high byte of zero plus three data bytes:
* the manufacturer id, then a two byte device id.
*/
- u32 jedec_id;
+ u64 jedec_id;
/* The size listed here is what works with OP_ERASE_PAGE. */
unsigned nr_pages;
@@ -713,63 +713,34 @@ static struct flash_info dataflash_data[] = {
* 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},
+ { "AT45DB011B", 0x1f22000000, 512, 264, 9, SUP_POW2PS},
+ { "at45db011d", 0x1f22000000, 512, 256, 8, SUP_POW2PS | IS_POW2PS},
- { "AT45DB021B", 0x1f2300, 1024, 264, 9, SUP_POW2PS},
- { "at45db021d", 0x1f2300, 1024, 256, 8, SUP_POW2PS | IS_POW2PS},
+ { "AT45DB021B", 0x1f23000000, 1024, 264, 9, SUP_POW2PS},
+ { "at45db021d", 0x1f23000000, 1024, 256, 8, SUP_POW2PS | IS_POW2PS},
- { "AT45DB041x", 0x1f2400, 2048, 264, 9, SUP_POW2PS},
- { "at45db041d", 0x1f2400, 2048, 256, 8, SUP_POW2PS | IS_POW2PS},
+ { "AT45DB041x", 0x1f24000000, 2048, 264, 9, SUP_POW2PS},
+ { "at45db041d", 0x1f24000000, 2048, 256, 8, SUP_POW2PS | IS_POW2PS},
- { "AT45DB081B", 0x1f2500, 4096, 264, 9, SUP_POW2PS},
- { "at45db081d", 0x1f2500, 4096, 256, 8, SUP_POW2PS | IS_POW2PS},
+ { "AT45DB081B", 0x1f25000000, 4096, 264, 9, SUP_POW2PS},
+ { "at45db081d", 0x1f25000000, 4096, 256, 8, SUP_POW2PS | IS_POW2PS},
- { "AT45DB161x", 0x1f2600, 4096, 528, 10, SUP_POW2PS},
- { "at45db161d", 0x1f2600, 4096, 512, 9, SUP_POW2PS | IS_POW2PS},
+ { "AT45DB161x", 0x1f26000000, 4096, 528, 10, SUP_POW2PS},
+ { "at45db161d", 0x1f26000000, 4096, 512, 9, SUP_POW2PS | IS_POW2PS},
- { "AT45DB321x", 0x1f2700, 8192, 528, 10, 0}, /* rev C */
+ { "AT45DB321x", 0x1f27000000, 8192, 528, 10, 0}, /* rev C */
- { "AT45DB321x", 0x1f2701, 8192, 528, 10, SUP_POW2PS},
- { "at45db321d", 0x1f2701, 8192, 512, 9, SUP_POW2PS | IS_POW2PS},
+ { "AT45DB321x", 0x1f27010000, 8192, 528, 10, SUP_POW2PS},
+ { "at45db321d", 0x1f27010000, 8192, 512, 9, SUP_POW2PS | IS_POW2PS},
- { "AT45DB642x", 0x1f2800, 8192, 1056, 11, SUP_POW2PS},
- { "at45db642d", 0x1f2800, 8192, 1024, 10, SUP_POW2PS | IS_POW2PS},
+ { "AT45DB642x", 0x1f28000000, 8192, 1056, 11, SUP_POW2PS},
+ { "at45db642d", 0x1f28000000, 8192, 1024, 10, SUP_POW2PS | IS_POW2PS},
};
-static struct flash_info *jedec_probe(struct spi_device *spi)
+static struct flash_info *jedec_lookup(struct spi_device *spi, u64 jedec)
{
- int ret, i;
- u8 code = OP_READ_ID;
- u8 id[3];
- u32 jedec;
+ int status, i;
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.
- */
- ret = spi_write_then_read(spi, &code, 1, id, 3);
- if (ret < 0) {
- pr_debug("%s: error %d reading JEDEC ID\n",
- dev_name(&spi->dev), ret);
- return ERR_PTR(ret);
- }
-
- if (id[0] != CFI_MFR_ATMEL)
- return NULL;
-
- jedec = id[0];
- jedec = jedec << 8;
- jedec |= id[1];
- jedec = jedec << 8;
- jedec |= id[2];
for (i = 0, info = dataflash_data;
i < ARRAY_SIZE(dataflash_data);
@@ -799,12 +770,58 @@ static struct flash_info *jedec_probe(struct spi_device *spi)
}
}
+ return NULL;
+}
+
+static struct flash_info *jedec_probe(struct spi_device *spi)
+{
+ int ret;
+ u8 code = OP_READ_ID;
+ u8 id[8] = {0};
+ const unsigned int id_size = 5;
+ const unsigned int first_byte = sizeof(id) - id_size;
+ const u64 eid_mask = GENMASK_ULL(63, 16);
+ u64 jedec;
+ struct flash_info *info;
+
+ /*
+ * 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.
+ */
+ ret = spi_write_then_read(spi, &code, 1, &id[first_byte], id_size);
+ if (ret < 0) {
+ pr_debug("%s: error %d reading JEDEC ID\n",
+ dev_name(&spi->dev), ret);
+ return ERR_PTR(ret);
+ }
+
+ if (id[first_byte] != CFI_MFR_ATMEL)
+ return NULL;
+
+ jedec = be64_to_cpup((__be64 *)id);
+
+ info = jedec_lookup(spi, jedec);
+ if (info)
+ return info;
+
+ /* Clear extended id bits and try to find a match again */
+ jedec &= eid_mask;
+
+ info = jedec_lookup(spi, jedec);
+ if (info)
+ return info;
+
/*
* 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);
+ dev_warn(&spi->dev, "JEDEC id %010llx not handled\n", jedec);
return ERR_PTR(-ENODEV);
}
--
2.9.3