- 11 May, 2020 40 commits
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Christophe Kerello authored
This patch removes the constant FMC2_TIMEOUT_US. FMC2_TIMEOUT_MS will be used each time that we need to wait (except when the timeout value is set by the framework). It was seen, during stress tests with the sequencer in an overloaded system, that we could be close to 1 second, even if we never met this value. To be safe, FMC2_TIMEOUT_MS is set to 5 seconds. Signed-off-by:
Christophe Kerello <christophe.kerello@st.com> Signed-off-by:
Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/1588756279-17289-4-git-send-email-christophe.kerello@st.com
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Christophe Kerello authored
Remove inline comments that are useless since function label are self explanatory. Signed-off-by:
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Christophe Kerello authored
This patch defers its probe when the expected reset control is not yet ready. This patch also handles properly all errors cases at probe time. Signed-off-by:
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Boris Brezillon authored
Now that exec_op() has been implemented we can get rid of the legacy interface implementation. Signed-off-by:
Boris Brezillon <boris.brezillon@collabora.com> Signed-off-by:
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Boris Brezillon authored
Implement exec_op() so we can later get rid of the legacy implementation. It's worth noting that the new implementation assert/deassert the CE pin on each operation, which might not be necessary. We also dropped the extra reset done at chip selection time on DOC2001plus. If it's needed we really should do something smarter, because having a reset everytime we access the chip is not that great perf-wise. Signed-off-by:
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Boris Brezillon authored
Stop relying on the dummy controller object embedded in nand_chip.legacy and explicitly inherit from nand_controller. Signed-off-by:
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Boris Brezillon authored
The logic can easily be merged in doc2000_readbuf(). Signed-off-by:
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Boris Brezillon authored
Single byte accesses normally go through read_byte() but we are about to use this function in the exec_op() implementation and thus needs to prepare for single byte reads. Signed-off-by:
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Boris Brezillon authored
We have a dummy block_bad() implementation returning 0. Let's set the NAND_NO_BBM_QUIRK flag and let the core take care of that. Signed-off-by:
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Boris Brezillon authored
We have a dummy block_bad() implementation returning 0. Let's set the NAND_NO_BBM_QUIRK flag and let the core take care of that. Signed-off-by:
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Boris Brezillon authored
Some controllers with embedded ECC engines override the BBM marker with data or ECC bytes, thus making bad block detection through bad block marker impossible. Let's flag those chips so the core knows it shouldn't check the BBM and consider all blocks good. This should allow us to get rid of two implementers of the legacy.block_bad() hook. Signed-off-by:
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Miquel Raynal authored
Some controller drivers do not support executing regular nand_read/write_page_raw() helpers. For that, we created nand_monolithic_read/write_page_raw() alternatives. Let's now allow the driver to overload the ECC ->read/write_page_raw() hooks when these hooks are supported. Signed-off-by:
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Miquel Raynal authored
Some controller drivers do not support executing regular nand_read/write_page_raw() helpers. For that, we created nand_monolithic_read/write_page_raw() alternatives. Let's now allow the driver to overload the ECC ->read/write_page_raw() hooks. Signed-off-by:
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Miquel Raynal authored
The current nand_read/write_page_raw() helpers are already widely used but do not fit the purpose of "constrained" controllers which cannot, for instance, separate command/address cycles with data cycles. Workaround this issue by proposing alternative helpers that can be used by these controller drivers instead. Signed-off-by:
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Miquel Raynal authored
We already know that there are controllers not able to read the three copies of the parameter page in one go. The workaround was to first request the controller to assert command and address cycles on the NAND bus to trigger a parameter page read, and then do a read operation for each page. But there are also controllers which are not able to split the parameter page read between the command/address cycles and the actual data operation. Let's use a regular PARAMETER PAGE READ operation for the first iteration and use eithe a CHANGE READ COLUMN or a simple DATA READ operation for the following copies, depending on what the controller supports. The default for non-exec-op compliant drivers remains unchanged: use a SIMPLE READ. Signed-off-by:
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Miquel Raynal authored
We already know that there are controllers not able to read the three copies of the parameter page in one go. The workaround was to first request the controller to assert command and address cycles on the NAND bus to trigger a parameter page read, and then do a simple read operation for each page. But there are also controllers which are not able to split the parameter page read between the command/address cycles and the actual data operation. Let's use a regular PARAMETER PAGE READ operation for the first iteration and use either a CHANGE READ COLUMN or a simple DATA READ operation for the following copies, depending on what the controller supports. The default behavior for non-exec-op compliant drivers remains the same: DATA READ. Signed-off-by:
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Miquel Raynal authored
This can be used to discriminate between two path in the parameter page detection: use data_in cycles (like before) if supported, use the CHANGE READ COLUMN command otherwise. Signed-off-by:
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Miquel Raynal authored
Let's use a helper to clearly check if an operation is supported or not. Return -ENOTSUPP when ->exec_op() is not implemented as we cannot know. Signed-off-by:
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Miquel Raynal authored
The logic in nand_do_read_ops() is to use a bufpoi variable, either set to the original buffer, or set to a bounce buffer which in the end happens to be chip->data_buf depending on the value of the use_bounce_buf boolean. This is not a reason to call chip->data_buf directly when we know that we are using the bounce buffer. Let's use bufpoi instead to be consistent. Signed-off-by:
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Miquel Raynal authored
Both in nand_do_read_ops() and nand_do_write_ops() there is a boolean called use_bufpoi which is set to true in case of unaligned request or when there is a need for a DMA-able buffer. It basically means "use a bounce buffer". Depending on the value of use_bufpoi, the bufpoi variable is always used and will either point to the original buffer or to the nand_chip structure "internal data buffer" (this buffer is allocated with kmalloc() on purpose so that it will be DMA-compliant). In all cases bufpoi is used so the boolean name is misleading. Rename use_bufpoi to be use_bouce_buf to be more accurate. Signed-off-by:
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Miquel Raynal authored
Clarify these comments which are not very accurate (even wrong in the read case). Signed-off-by:
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Miquel Raynal authored
NAND controller drivers can set the NAND_USE_BOUNCE_BUFFER flag to a chip 'option' field. With this flag, the core is responsible of providing DMA-able buffers. The current behavior is to not force the use of a bounce buffer when the core thinks this is not needed. So in the end the name is a bit misleading, because in theory we will always have a DMA buffer but in practice it will not always be a bounce buffer. Rename this flag NAND_USES_DMA to be more accurate. Signed-off-by:
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Miquel Raynal authored
These flags are in a strange order, reorder the list, add spaces when it is relevant, pack definitions that are related. There is no functional change. Signed-off-by:
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Miquel Raynal authored
Use the BIT() macro instead of defining a 8-digit value. Signed-off-by:
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Boris Brezillon authored
The MTD layer provides an SLC mode (purely software emulation of SLC behavior) addressing the paired-pages corruption issue, which was the main reason for refusing attaching MLC NANDs to UBI. Relax this rule and allow partitions that have the MTD_EMULATE_SLC_ON_MLC flag set to be attached. Signed-off-by:
Boris Brezillon <bbrezillon@kernel.org> Signed-off-by:
Richard Weinberger <richard@nod.at> Link: https://lore.kernel.org/linux-mtd/20200503155341.16712-9-miquel.raynal@bootlin.com
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Boris Brezillon authored
Add a new option to set the MTD_SLC_ON_MLC_EMULATION flag. Signed-off-by:
Boris Brezillon <boris.brezillon@bootlin.com> Signed-off-by:
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Boris Brezillon authored
Parse the slc-mode property and set the MTD_MLC_IN_SLC_MODE flag when present. Signed-off-by:
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Boris Brezillon authored
Add a boolean property to force a specific partition attached to an MLC NAND to be accessed in an emulated SLC mode this making this partition immune to paired-pages corruptions. Signed-off-by:
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Boris Brezillon authored
MLC NANDs can be made a bit more reliable if we only program the lower page of each pair. At least, this solves the paired-pages corruption issue. Signed-off-by:
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Boris Brezillon authored
TC58TEG5DCLTA00 uses a stride of 3 between its lower and upper page. Set the appropriate pairing scheme at init time. Signed-off-by:
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Boris Brezillon authored
Define a new page pairing scheme for MLC NANDs with a distance of 3 pages between the lower and upper page. Signed-off-by:
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Boris Brezillon authored
TC58TEG5DCLTA00 is an MLC NAND which requires scrambling and supports SDR timings mode 5. Signed-off-by:
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Boris Brezillon authored
Now that exec_op() is implemented we no longer need to implement the legacy hooks. Signed-off-by:
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Boris Brezillon authored
So we can later get rid of the legacy hooks. Signed-off-by:
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Boris Brezillon authored
Now that we have our own controller struct we can keep the MMIO pointer in there and use instead of using the chip->legacy.IO_ADDR_{R,W} fields. Signed-off-by: -
Boris Brezillon authored
The CS553x companion chip embeds 4 NAND controllers. Declare them as NAND controllers instead of NAND chips. That's done in preparation of the transition to exec_op(). Signed-off-by:
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Miquel Raynal authored
Before reworking a little bit the JEDEC detection code, let's clean the coding style of an if statement to improve readability. Signed-off-by:
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Miquel Raynal authored
Use a macro to define the number of parameter page instead of hardcoding it everywhere. Signed-off-by:
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Miquel Raynal authored
During detection the logic on the NAND bus is: /* Regular ONFI detection */ 1/ read the three NAND parameter pages /* Extended parameter page detection */ 2/ send "read the NAND parameter page" commands without reading actual data 3/ move the column pointer to the extended page and read it If fact, as long as there is nothing happening on the NAND bus between 1/ and 3/, the operation 2/ is redundant so remove it. Signed-off-by: -
Miquel Raynal authored
There is no need for copying the parameter page, playing with pointers does the trick. There is not functional change. Signed-off-by:
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