[U-Boot] [PATCH v4 2/4] nand: lpc32xx: add SLC NAND controller support

[Scott Wood <scottwood@freescale.com>]

On Sat, 2015-07-18 at 03:07 +0300, Vladimir Zapolskiy wrote:
> The change adds support of LPC32xx SLC NAND controller.
> 
> LPC32xx SoC has two different mutually exclusive NAND controllers to
> communicate with single and multiple layer chips.
> 
> This simple driver allows to specify NAND chip timings and defines
> custom read_buf()/write_buf() operations, because access to 8-bit data
> register must be 32-bit aligned.
> 
> Support of hardware ECC calculation is not implemented (data
> correction is always done by software), since it requires a working
> DMA engine.
> 
> The driver can be included to an SPL image.
> 
> Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
> ---
> Changes from v3 to v4:
> * renamed "lpc32xx_nand_slc_registers" to "lpc32xx_nand_slc_regs",
> * replaced non-leading tabs with spaces to get columned assignments,
> * removed leftover redundant type casts,
> * lpc32xx_nand_cmd_ctrl() sets address register iff (ctrl & NAND_ALE).
> 
> Changes from v2 to v3:
> * no changes, sent a non-rebased version by mistake.
> 
> Changes from v1 to v2:
> * addressed Albert's and Scott's comments to LPC32xx SLC NAND driver:
>   - removed unnecessary uint32_t casts in write_buf()/write_byte(),
>   - removed IO_ADDR_[RW] assignment, this is done in nand.c for SPL
>     and generally not needed for custom defined PIO interfaces in
>     U-boot (with exception of simple NAND SPL, addressed by 1/4),
>   - removed leftover declarations of HW ECC related bit fields,
>     this should be added along with HW ECC support,
>   - improved description of a reason why software ECC is selected,
>     if DMA is unavailable (explicit reference to User Manual from NXP).
> 
> Previous review can be found here:
>   v3:
>     http://lists.denx.de/pipermail/u-boot/2015-July/219431.html
> 
>   v2:
>     http://lists.denx.de/pipermail/u-boot/2015-July/219422.html
> 
>   v1:
>     http://lists.denx.de/pipermail/u-boot/2015-July/219095.html
>     http://lists.denx.de/pipermail/u-boot/2015-July/219254.html
> 
>  arch/arm/cpu/arm926ejs/lpc32xx/devices.c      |   6 +
>  arch/arm/include/asm/arch-lpc32xx/clk.h       |   2 +
>  arch/arm/include/asm/arch-lpc32xx/sys_proto.h |   1 +
>  drivers/mtd/nand/Makefile                     |   1 +
>  drivers/mtd/nand/lpc32xx_nand_slc.c           | 176 
> ++++++++++++++++++++++++++
>  5 files changed, 186 insertions(+)
>  create mode 100644 drivers/mtd/nand/lpc32xx_nand_slc.c

Acked-by: Scott Wood <scottwood@freescale.com>

-Scott