7de117fd5b
This driver was originally written for the Intel MRST platform with several platform-specific parameters hard-coded. Currently, the ECC settings are hard-coded as follows: #define ECC_SECTOR_SIZE 512 #define ECC_8BITS 14 #define ECC_15BITS 26 Therefore, the driver can only support two cases. - ecc.size = 512, ecc.strength = 8 --> ecc.bytes = 14 - ecc.size = 512, ecc.strength = 15 --> ecc.bytes = 26 However, these are actually customizable parameters, for example, UniPhier platform supports the following: - ecc.size = 1024, ecc.strength = 8 --> ecc.bytes = 14 - ecc.size = 1024, ecc.strength = 16 --> ecc.bytes = 28 - ecc.size = 1024, ecc.strength = 24 --> ecc.bytes = 42 So, we need to handle the ECC parameters in a more generic manner. Fortunately, the Denali User's Guide explains how to calculate the ecc.bytes. The formula is: ecc.bytes = 2 * CEIL(13 * ecc.strength / 16) (for ecc.size = 512) ecc.bytes = 2 * CEIL(14 * ecc.strength / 16) (for ecc.size = 1024) For DT platforms, it would be reasonable to allow DT to specify ECC strength by either "nand-ecc-strength" or "nand-ecc-maximize". If none of them is specified, the driver will try to meet the chip's ECC requirement. For PCI platforms, the max ECC strength is used to keep the original behavior. Newer versions of this IP need ecc.size and ecc.steps explicitly set up via the following registers: CFG_DATA_BLOCK_SIZE (0x6b0) CFG_LAST_DATA_BLOCK_SIZE (0x6c0) CFG_NUM_DATA_BLOCKS (0x6d0) For older IP versions, write accesses to these registers are just ignored. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
30 lines
1.0 KiB
Plaintext
30 lines
1.0 KiB
Plaintext
* Denali NAND controller
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Required properties:
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- compatible : should be one of the following:
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"altr,socfpga-denali-nand" - for Altera SOCFPGA
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- reg : should contain registers location and length for data and reg.
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- reg-names: Should contain the reg names "nand_data" and "denali_reg"
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- interrupts : The interrupt number.
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Optional properties:
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- nand-ecc-step-size: see nand.txt for details. If present, the value must be
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512 for "altr,socfpga-denali-nand"
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- nand-ecc-strength: see nand.txt for details. Valid values are:
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8, 15 for "altr,socfpga-denali-nand"
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- nand-ecc-maximize: see nand.txt for details
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The device tree may optionally contain sub-nodes describing partitions of the
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address space. See partition.txt for more detail.
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Examples:
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nand: nand@ff900000 {
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#address-cells = <1>;
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#size-cells = <1>;
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compatible = "altr,socfpga-denali-nand";
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reg = <0xff900000 0x100000>, <0xffb80000 0x10000>;
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reg-names = "nand_data", "denali_reg";
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interrupts = <0 144 4>;
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};
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