[U-Boot] Remove board specific code from ENC28J60 network driver?

[Dirk Behme <dirk.behme@googlemail.com>]

On 20.12.2009 21:05, Mike Frysinger wrote:
> On Sunday 20 December 2009 14:30:35 Dirk Behme wrote:
>> For TI OMAP3 Beagle based Zippy expansion board from TinCanTools [1]
>> I'm currently looking into reusing spi based ENC28J60 network driver
>>
>> drivers/net/enc28j60.c
>>
>> It seems to me that it uses LPC2292 specific macros
>>
>> IO1CLR, IO1SET and IO1DIR
>>
>> These macros are defined in
>>
>> asm-arm/arch-lpc2292/lpc2292_registers.h
>
> this is why we didnt bother trying to get this part working on Blackfin boards
> under u-boot.  it works fine for us under Linux, but the u-boot driver is a
> joke.
>
>>    From enc28j60.c:
>>
>> ...
>> #define enc_enable() PUT32(IO1CLR, ENC_SPI_SLAVE_CS)
>> #define enc_disable() PUT32(IO1SET, ENC_SPI_SLAVE_CS)
>> ...
>>
>> ...
>> /* configure GPIO */
>> (*((volatile unsigned long *) IO1DIR)) |= ENC_SPI_SLAVE_CS;
>> (*((volatile unsigned long *) IO1DIR)) |= ENC_RESET;
>>
>> /* CS and RESET active low */
>> PUT32 (IO1SET, ENC_SPI_SLAVE_CS);
>> PUT32 (IO1SET, ENC_RESET);
>> ...
>>
>> Anybody with an idea how to move this code to some (LPC2292?) board
>> specific files to make enc28j60.c more generic to be able to reuse it
>> on other boards?
>
> unless the maintainers of the LPC2292 board are willing to help, i'd say just
> avoid the issue:
>   - rename/move this driver to indicate it is specific to LPC2292
>   - create a new driver based on the old one using the common SPI framework
>
> once it starts using the common SPI framework, i should be able to easily help
> with testing on Blackfin boards.  we have a little addon card that lets us
> hook it up to a bunch of different boards.

I started to convert the enc28j60.c to common SPI framework. Do you 
like to have a look at attachment (and maybe test it?)?

It is compile tested only. And for the moment it just re-uses the 
existing driver. When we know that it basically works this way, doing 
it in a clean way as you describe above would be the next step. 
CONFIG_NET_MULTI is still missing, too.

In your config file you have to set and configure

#define CONFIG_xxx_SPI
#define CONFIG_ENC28J60
#define CONFIG_ENC28J60_SPI_BUS		0
#define CONFIG_ENC28J60_SPI_CS		0
#define CONFIG_ENC28J60_SPI_CLK		1000000
#define CONFIG_CMD_NET

for your board.

Opinions, ideas, proposals etc?

Best regards

Dirk

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