mtd: nand: denali: support direct addressing mode

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The Denali NAND IP core decodes the lower 28 bits of the slave address
to get the control information; bit[27:26]=mode, bit[25:24]=bank, etc.
This means 256MB address range must be allocated for this IP.  (Direct
Addressing)

For systems with address space limitation, the Denali IP provides an
optional module that translates the addressing - address and data are
latched by the registers in the translation module. (Indexed Addressing)

The addressing mode can be selected when the delivered RTL is configured,
and it can be read out from the FEATURES register.

Most of SoC vendors would choose Indexed Addressing to save the address
space, but Direct Addressing is possible as well, and it can be easily
supported by adding ->host_{read,write} hooks.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

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This commit is contained in:

Masahiro Yamada 2017-09-22 12:46:48 +09:00 • committed by Boris Brezillon

parent c70b5eb20a

commit 29c4dd9287

2 changed files with 70 additions and 41 deletions

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109

drivers/mtd/nand/denali.c

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2

drivers/mtd/nand/denali.h

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