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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-13 20:25:54 +0100 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-13 20:25:54 +0100 |
commit | ac53b2e053fffc74372da94e734b92f37e70d32c (patch) | |
tree | cda82af0fcded5d230e9f56104d3988b7a75c8aa /Documentation/DocBook | |
parent | Merge tag 'for-linus-4.5' of git://git.code.sf.net/p/openipmi/linux-ipmi (diff) | |
parent | mtd: jz4780_nand: replace if/else blocks with switch/case (diff) | |
download | linux-ac53b2e053fffc74372da94e734b92f37e70d32c.tar.xz linux-ac53b2e053fffc74372da94e734b92f37e70d32c.zip |
Merge tag 'for-linus-20160112' of git://git.infradead.org/linux-mtd
Pull MTD updates from Brian Norris:
"Generic MTD:
- populate the MTD device 'of_node' field (and get a proper 'of_node'
symlink in sysfs)
This yielded some new helper functions, and changes across a
variety of drivers
- partitioning cleanups, to prepare for better device-tree based
partitioning in the future
Eliminate a lot of boilerplate for drivers that want to use
OF-based partition parsing
The DT bindings for this didn't settle yet, so most non-cleanup
portions are deferred for a future release
NAND:
- embed a struct mtd_info inside struct nand_chip
This is really long overdue; too many drivers have to do the same
silly boilerplate to allocate and link up two "independent"
structs, when in fact, everyone is assuming there is an exact 1:1
relationship between a NAND chips struct and its underlying MTD.
This aids improved helpers and should make certain abstractions
easier in the future.
Also causes a lot of churn, helped along by some automated code
transformations
- add more core support for detecting (and "correcting") bitflips in
erased pages; requires opt-in by drivers, but at least we kill a
few bad implementations and hopefully stave off future ones
- pxa3xx_nand: cleanups, a few fixes, and PM improvements
- new JZ4780 NAND driver
SPI NOR:
- provide default erase function, for controllers that just want to
send the SECTOR_ERASE command directly
- fix some module auto-loading issues with device tree
("jedec,spi-nor")
- error handling fixes
- new Mediatek QSPI flash driver
Other:
- cfi: force valid geometry Kconfig (finally!)
This one used to trip up randconfigs occasionally, since bots
aren't deterred by big scary "advanced configuration" menus
More? Probably. See the commit logs"
* tag 'for-linus-20160112' of git://git.infradead.org/linux-mtd: (168 commits)
mtd: jz4780_nand: replace if/else blocks with switch/case
mtd: nand: jz4780: Update ecc correction error codes
mtd: nandsim: use nand_get_controller_data()
mtd: jz4780_nand: remove useless mtd->priv = chip assignment
staging: mt29f_spinand: make use of nand_set/get_controller_data() helpers
mtd: nand: make use of nand_set/get_controller_data() helpers
ARM: make use of nand_set/get_controller_data() helpers
mtd: nand: add helpers to access ->priv
mtd: nand: jz4780: driver for NAND devices on JZ4780 SoCs
mtd: nand: jz4740: remove custom 'erased check' implementation
mtd: nand: diskonchip: remove custom 'erased check' implementation
mtd: nand: davinci: remove custom 'erased check' implementation
mtd: nand: use nand_check_erased_ecc_chunk in default ECC read functions
mtd: nand: return consistent error codes in ecc.correct() implementations
doc: dt: mtd: new binding for jz4780-{nand,bch}
mtd: cfi_cmdset_0001: fixing memory leak and handling failed kmalloc
mtd: spi-nor: wait until lock/unlock operations are ready
mtd: tests: consolidate kmalloc/memset 0 call to kzalloc
jffs2: use to_delayed_work
mtd: nand: assign reasonable default name for NAND drivers
...
Diffstat (limited to 'Documentation/DocBook')
-rw-r--r-- | Documentation/DocBook/mtdnand.tmpl | 35 |
1 files changed, 17 insertions, 18 deletions
diff --git a/Documentation/DocBook/mtdnand.tmpl b/Documentation/DocBook/mtdnand.tmpl index 7da8f0402af5..b442921bca54 100644 --- a/Documentation/DocBook/mtdnand.tmpl +++ b/Documentation/DocBook/mtdnand.tmpl @@ -162,12 +162,15 @@ <sect1 id="Basic_defines"> <title>Basic defines</title> <para> - At least you have to provide a mtd structure and - a storage for the ioremap'ed chip address. - You can allocate the mtd structure using kmalloc - or you can allocate it statically. - In case of static allocation you have to allocate - a nand_chip structure too. + At least you have to provide a nand_chip structure + and a storage for the ioremap'ed chip address. + You can allocate the nand_chip structure using + kmalloc or you can allocate it statically. + The NAND chip structure embeds an mtd structure + which will be registered to the MTD subsystem. + You can extract a pointer to the mtd structure + from a nand_chip pointer using the nand_to_mtd() + helper. </para> <para> Kmalloc based example @@ -180,7 +183,6 @@ static void __iomem *baseaddr; Static example </para> <programlisting> -static struct mtd_info board_mtd; static struct nand_chip board_chip; static void __iomem *baseaddr; </programlisting> @@ -235,7 +237,7 @@ static void board_hwcontrol(struct mtd_info *mtd, int cmd) <programlisting> static void board_hwcontrol(struct mtd_info *mtd, int cmd) { - struct nand_chip *this = (struct nand_chip *) mtd->priv; + struct nand_chip *this = mtd_to_nand(mtd); switch(cmd){ case NAND_CTL_SETCLE: this->IO_ADDR_W |= CLE_ADRR_BIT; break; case NAND_CTL_CLRCLE: this->IO_ADDR_W &= ~CLE_ADRR_BIT; break; @@ -274,13 +276,15 @@ static int __init board_init (void) int err = 0; /* Allocate memory for MTD device structure and private data */ - board_mtd = kzalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL); - if (!board_mtd) { + this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL); + if (!this) { printk ("Unable to allocate NAND MTD device structure.\n"); err = -ENOMEM; goto out; } + board_mtd = nand_to_mtd(this); + /* map physical address */ baseaddr = ioremap(CHIP_PHYSICAL_ADDRESS, 1024); if (!baseaddr) { @@ -289,11 +293,6 @@ static int __init board_init (void) goto out_mtd; } - /* Get pointer to private data */ - this = (struct nand_chip *) (); - /* Link the private data with the MTD structure */ - board_mtd->priv = this; - /* Set address of NAND IO lines */ this->IO_ADDR_R = baseaddr; this->IO_ADDR_W = baseaddr; @@ -317,7 +316,7 @@ static int __init board_init (void) out_ior: iounmap(baseaddr); out_mtd: - kfree (board_mtd); + kfree (this); out: return err; } @@ -343,7 +342,7 @@ static void __exit board_cleanup (void) iounmap(baseaddr); /* Free the MTD device structure */ - kfree (board_mtd); + kfree (mtd_to_nand(board_mtd)); } module_exit(board_cleanup); #endif @@ -399,7 +398,7 @@ static void board_select_chip (struct mtd_info *mtd, int chip) <programlisting> static void board_select_chip (struct mtd_info *mtd, int chip) { - struct nand_chip *this = (struct nand_chip *) mtd->priv; + struct nand_chip *this = mtd_to_nand(mtd); /* Deselect all chips */ this->IO_ADDR_R &= ~BOARD_NAND_ADDR_MASK; |