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Message-Id: <1483448495-31607-6-git-send-email-boris.brezillon@free-electrons.com>
Date: Tue, 3 Jan 2017 14:01:25 +0100
From: Boris Brezillon <boris.brezillon@...e-electrons.com>
To: Boris Brezillon <boris.brezillon@...e-electrons.com>,
Richard Weinberger <richard@....at>,
linux-mtd@...ts.infradead.org
Cc: David Woodhouse <dwmw2@...radead.org>,
Brian Norris <computersforpeace@...il.com>,
Marek Vasut <marek.vasut@...il.com>,
Cyrille Pitchen <cyrille.pitchen@...el.com>,
Icenowy Zheng <icenowy@...c.xyz>, Valdis.Kletnieks@...edu,
linux-kernel@...r.kernel.org
Subject: [PATCH v4 05/15] mtd: nand: add manufacturer specific initialization/detection steps
A lot of NANDs are implementing generic features in a non-generic way,
or are providing advanced auto-detection logic where the NAND ID bytes
meaning changes with the NAND generation.
Providing this vendor specific initialization step will allow us to get
rid of the full ids in the nand_ids table or all the vendor specific
cases added over the time in the generic NAND ID decoding logic.
Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
---
drivers/mtd/nand/nand_base.c | 67 +++++++++++++++++++++++++++++++++++---------
include/linux/mtd/nand.h | 35 +++++++++++++++++++++++
2 files changed, 89 insertions(+), 13 deletions(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index efb3ade568d8..8f80faa57984 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -3779,7 +3779,7 @@ static int nand_get_bits_per_cell(u8 cellinfo)
* chip. The rest of the parameters must be decoded according to generic or
* manufacturer-specific "extended ID" decoding patterns.
*/
-static void nand_decode_ext_id(struct nand_chip *chip)
+void nand_decode_ext_id(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
int extid, id_len = chip->id.len;
@@ -3904,6 +3904,7 @@ static void nand_decode_ext_id(struct nand_chip *chip)
}
}
+EXPORT_SYMBOL_GPL(nand_decode_ext_id);
/*
* Old devices have chip data hardcoded in the device ID table. nand_decode_id
@@ -4008,13 +4009,44 @@ static bool find_full_id_nand(struct nand_chip *chip,
}
/*
+ * Manufacturer detection. Only used when the NAND is not ONFI or JEDEC
+ * compliant and does not have a full-id or legacy-id entry in the nand_ids
+ * table.
+ */
+static void nand_manufacturer_detect(struct nand_chip *chip)
+{
+ /*
+ * Try manufacturer detection if available and use
+ * nand_decode_ext_id() otherwise.
+ */
+ if (chip->manufacturer.ops && chip->manufacturer.ops->detect)
+ chip->manufacturer.ops->detect(chip);
+ else
+ nand_decode_ext_id(chip);
+}
+
+/*
+ * Manufacturer initialization. This function is called for all NANDs including
+ * ONFI and JEDEC compliant ones.
+ * Manufacturer drivers should put all their specific initialization code in
+ * their ->init() hook.
+ */
+static int nand_manufacturer_init(struct nand_chip *chip)
+{
+ if (!chip->manufacturer.ops || !chip->manufacturer.ops->init)
+ return 0;
+
+ return chip->manufacturer.ops->init(chip);
+}
+
+/*
* Get the flash and manufacturer id and lookup if the type is supported.
*/
static int nand_detect(struct nand_chip *chip, struct nand_flash_dev *type)
{
struct mtd_info *mtd = nand_to_mtd(chip);
int busw;
- int i, maf_idx;
+ int i, maf_idx, ret;
u8 *id_data = chip->id.data;
u8 maf_id, dev_id;
@@ -4055,6 +4087,14 @@ static int nand_detect(struct nand_chip *chip, struct nand_flash_dev *type)
chip->id.len = nand_id_len(id_data, 8);
+ /* Try to identify manufacturer */
+ for (maf_idx = 0; nand_manuf_ids[maf_idx].id != 0x0; maf_idx++) {
+ if (nand_manuf_ids[maf_idx].id == maf_id)
+ break;
+ }
+
+ chip->manufacturer.ops = nand_manuf_ids[maf_idx].ops;
+
if (!type)
type = nand_flash_ids;
@@ -4101,12 +4141,11 @@ static int nand_detect(struct nand_chip *chip, struct nand_flash_dev *type)
chip->chipsize = (uint64_t)type->chipsize << 20;
- if (!type->pagesize) {
- /* Decode parameters from extended ID */
- nand_decode_ext_id(chip);
- } else {
+ if (!type->pagesize)
+ nand_manufacturer_detect(chip);
+ else
nand_decode_id(chip, type);
- }
+
/* Get chip options */
chip->options |= type->options;
@@ -4118,12 +4157,6 @@ static int nand_detect(struct nand_chip *chip, struct nand_flash_dev *type)
chip->options &= ~NAND_SAMSUNG_LP_OPTIONS;
ident_done:
- /* Try to identify manufacturer */
- for (maf_idx = 0; nand_manuf_ids[maf_idx].id != 0x0; maf_idx++) {
- if (nand_manuf_ids[maf_idx].id == maf_id)
- break;
- }
-
if (chip->options & NAND_BUSWIDTH_AUTO) {
WARN_ON(busw & NAND_BUSWIDTH_16);
nand_set_defaults(chip);
@@ -4163,6 +4196,10 @@ static int nand_detect(struct nand_chip *chip, struct nand_flash_dev *type)
if (mtd->writesize > 512 && chip->cmdfunc == nand_command)
chip->cmdfunc = nand_command_lp;
+ ret = nand_manufacturer_init(chip);
+ if (ret)
+ return ret;
+
pr_info("device found, Manufacturer ID: 0x%02x, Chip ID: 0x%02x\n",
maf_id, dev_id);
@@ -4907,6 +4944,10 @@ void nand_cleanup(struct nand_chip *chip)
if (chip->badblock_pattern && chip->badblock_pattern->options
& NAND_BBT_DYNAMICSTRUCT)
kfree(chip->badblock_pattern);
+
+ /* Release manufacturer private data */
+ if (chip->manufacturer.ops && chip->manufacturer.ops->cleanup)
+ chip->manufacturer.ops->cleanup(chip);
}
EXPORT_SYMBOL_GPL(nand_cleanup);
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 632975146c30..efba76951b7c 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -732,6 +732,20 @@ nand_get_sdr_timings(const struct nand_data_interface *conf)
}
/**
+ * struct nand_manufacturer_ops - NAND Manufacturer operations
+ * @detect: detect the NAND memory organization and capabilities
+ * @init: initialize all vendor specific fields (like the ->read_retry()
+ * implementation) if any.
+ * @cleanup: the ->init() function may have allocated resources, ->cleanup()
+ * is here to let vendor specific code release those resources.
+ */
+struct nand_manufacturer_ops {
+ void (*detect)(struct nand_chip *chip);
+ int (*init)(struct nand_chip *chip);
+ void (*cleanup)(struct nand_chip *chip);
+};
+
+/**
* struct nand_chip - NAND Private Flash Chip Data
* @mtd: MTD device registered to the MTD framework
* @IO_ADDR_R: [BOARDSPECIFIC] address to read the 8 I/O lines of the
@@ -831,6 +845,7 @@ nand_get_sdr_timings(const struct nand_data_interface *conf)
* additional error status checks (determine if errors are
* correctable).
* @write_page: [REPLACEABLE] High-level page write function
+ * @manufacturer: [INTERN] Contains manufacturer data
*/
struct nand_chip {
@@ -917,6 +932,11 @@ struct nand_chip {
struct nand_bbt_descr *badblock_pattern;
void *priv;
+
+ struct {
+ const struct nand_manufacturer_ops *ops;
+ void *priv;
+ } manufacturer;
};
extern const struct mtd_ooblayout_ops nand_ooblayout_sp_ops;
@@ -953,6 +973,17 @@ static inline void nand_set_controller_data(struct nand_chip *chip, void *priv)
chip->priv = priv;
}
+static inline void nand_set_manufacturer_data(struct nand_chip *chip,
+ void *priv)
+{
+ chip->manufacturer.priv = priv;
+}
+
+static inline void *nand_get_manufacturer_data(struct nand_chip *chip)
+{
+ return chip->manufacturer.priv;
+}
+
/*
* NAND Flash Manufacturer ID Codes
*/
@@ -1058,10 +1089,12 @@ struct nand_flash_dev {
* struct nand_manufacturers - NAND Flash Manufacturer ID Structure
* @name: Manufacturer name
* @id: manufacturer ID code of device.
+ * @ops: manufacturer operations
*/
struct nand_manufacturers {
int id;
char *name;
+ const struct nand_manufacturer_ops *ops;
};
extern struct nand_flash_dev nand_flash_ids[];
@@ -1232,4 +1265,6 @@ int nand_reset(struct nand_chip *chip, int chipnr);
/* Free resources held by the NAND device */
void nand_cleanup(struct nand_chip *chip);
+/* Default extended ID decoding function */
+void nand_decode_ext_id(struct nand_chip *chip);
#endif /* __LINUX_MTD_NAND_H */
--
2.7.4
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