Some NAND operations are so fast that it doesn't make any sense to use
interrupt based waits (the scheduling overhead is not worth it).
Rename sunxi_nfc_wait_int() into sunxi_nfc_wait_events() and add a
parameter to specify whether polling should be used or not.

Note that all sunxi_nfc_wait_int() are moved to the polling approach now,
but this should change as soon as we have more information about the
approximate time we are about to wait (can be extracted from the NAND
timings, and the type of operation).
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Replace open coded polling loops by readl_poll_timeout() calls.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

->dev_ready() is not supposed to wait for busy to ready solution (this is
the role of ->waitfunc()).
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

When the NAND controller operates in DMA mode it can pipeline ECC
operations which improves the throughput.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

mod and ahb clocks are not disabled when the NAND controller device is
removed.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

NFC_PAGE_SHIFT() already takes the real page_shift value and subtract 10
to it.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

NFC_ECC_ERR_CNT() is not taking into account the case when the NAND chip
contains more than 4 ECC blocks (NANDs with 4kB+ pages).
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

We don't need to manually toggle the CE line since the controller handles
it for us. Moreover, keeping the CE line low when interacting with a DDR
NAND can be problematic (data loss in some corner cases).
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Try to pack address and command cycles into a single NAND controller
command to avoid polling the status register for each single change
on the NAND bus.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Being able to read subpages can greatly improve read performances if the
MTD user is only interested in a small section of a NAND page.
This is particularly true with large pages (>= 8k).
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Allwinner's ECC engine is capable of protecting a few bytes of the OOB
area. Implement specific OOB functions to benefit from this capability.

Also, when in raw mode, the randomizer is disabled, which means you'll
only be able to retrieve randomized data, which is not really useful
for most applications.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Export the default read/write oob functions (for the standard and syndrome
scheme), so that drivers can use them for their raw implementation and
implement their own functions for the normal oob operation.

This is required if your ECC engine is capable of fixing some of the OOB
data. In this case you have to overload the ->read_oob() and ->write_oob(),
but if you don't specify the ->read/write_oob_raw() functions they are
assigned to the ->read/write_oob() implementation, which is not what you
want.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Adapt the NAND controller clk rate to the tWB, tADL, tWHR and tRHW
timings instead of returning an error when the maximum clk divisor is
not big enough to provide an appropriate timing.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

The ONFI spec says that EDO should be enabled if the host drives tRC less
than 30ns, but the code just tests for the tRC_min value extracted from
the timings exposed by the NAND chip not the timings actually configured
in the NAND controller.
Fix that by first rounding down the requested clk_rate with
clk_round_rate() and then checking if tRC is actually smaller than 30ns.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Unlike what is specified in the Allwinner datasheets, the NAND clock rate
is not equal to 2/T but 1/T. Fix the clock rate selection accordingly.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

sunxi_nand_chip_set_timings() is extracting a pointer to the nfc from the
nand->controller field, but this field is initialized after
sunxi_nand_chip_set_timings() call.
Reorder the calls to avoid any problem.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

The core now takes care of parsing generic DT properties in
nand_scan_ident() when nand_set_flash_node() has been called.
Rely on this initialization instead of calling of_get_nand_xxx()
manually.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: NEzequiel Garcia <ezequiel@vanguardiasur.com.ar>

The core now takes care of parsing generic DT properties in
nand_scan_ident() when nand_set_flash_node() has been called.
Rely on this initialization instead of calling of_get_nand_xxx()
manually.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: NNicolas Ferre <nicolas.ferre@atmel.com>

It also contains some minor related changes:
1) Don't warn if kzalloc fails as it dumps stack on its own
2) Use %pR format for displaying whole resource to avoid invalid format
   warning
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

The core now takes care of parsing generic DT properties in
nand_scan_ident() when nand_set_flash_node() has been called.
Rely on this initialization instead of calling of_get_nand_xxx()
manually.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: NBrian Norris <computersforpeace@gmail.com>

The core now takes care of parsing generic DT properties in
nand_scan_ident() when nand_set_flash_node() has been called.
Rely on this initialization instead of calling of_get_nand_xxx()
manually.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: NRoger Quadros <rogerq@ti.com>
Tested-by: NFranklin S Cooper Jr. <fcooper@ti.com>

Some drivers are including linux/of_mtd.h even if they don't use any of
the of_get_nand_xxx() helpers.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: NHarvey Hunt <harvey.hunt@imgtec.com>

If there is only one bit difference in the ECC, the function should
return 1.
The result of "diff0 & ~(1<<fls(diff0))" is equal to diff0, so the
function actually returns -1.
Signed-off-by: NZhaoxiu Zeng <zhaoxiu.zeng@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

The new IFC controller version 2.0 has a different memory map page.
Upto IFC 1.4 PAGE size is 4 KB and from IFC2.0 PAGE size is 64KB.
This patch segregates the IFC global and runtime registers to appropriate
PAGE sizes.
Signed-off-by: NJaiprakash Singh <b44839@freescale.com>
Signed-off-by: NRaghav Dogra <raghav@freescale.com>
Acked-by: NLi Yang <leoyang.li@nxp.com>
Signed-off-by: NRaghav Dogra <raghav.dogra@nxp.com>
Acked-by: NScott Wood <oss@buserror.net>
Acked-by: NBrian Norris <computersforpeace@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

There's no reason to BUG() when parameters are being
validated. Drivers can get things wrong, and it's much nicer
to just throw a noisy warn and fail gracefully, than calling
BUG() and throwing the whole system down the drain.
Signed-off-by: NEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Reviewed-by: NRichard Weinberger <richard@nod.at>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

fix the raw_buffer pointer double free issue found by coverify.

CID 18344 (#2 of 2): Double free (USE_AFTER_FREE)
3. double_free: Calling gpmi_alloc_dma_buffer frees pointer
this->raw_buffer which has already been freed
Signed-off-by: NHan Xu <han.xu@nxp.com>
Reviewed-by: NRichard Weinberger <richard@nod.at>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Document and match the brcm,brcmnand-v6.2 compatible string, the controller has
a register layout identical to the v6.0 version and supports prefetch. Update the
command shift logic to account for v6.2 controller which are the first ones to
use a shift of 0 (6.1 used a shift of 24).
Signed-off-by: NKamal Dasu <kdasu.kdev@gmail.com>
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Acked-by: NRob Herring <robh@kernel.org>
Acked-by: NBrian Norris <computersforpeace@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Standardize the NAND controller/NAND chip DT representation. Now, all new
NAND controller drivers should comply with this representation, even if
they are only supporting a single NAND chip.

Existing drivers can keep support for the old representation (where only
the NAND chip was described), but are encouraged to also support the new
one.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: NBrian Norris <computersforpeace@gmail.com>
Acked-by: NRob Herring <robh@kernel.org>

bch->dev is already assigned to &pdev->dev in the probe function.
Remove the duplicate assignment done in jz4780_bch_get().
Signed-off-by: NJorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: NAcked-by: Harvey Hunt <harvey.hunt@imgtec.com>

New atmel SoCs are able to fix bitflips in erased pages, but old ones
are still impacted by this problem. Use nand_check_erased_ecc_chunk() to
handle this case.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Reported-by: NHerve Codina <herve.CODINA@celad.com>
Reviewed-by: NHerve Codina <herve.CODINA@celad.com>
Tested-by: NHerve Codina <herve.CODINA@celad.com>

This follows recent work on switching to enum nand_ecc_algo and
deprecating NAND_ECC_SOFT_BCH.
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Use recently added of_get_nand_ecc_algo for that.
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>