[U-Boot] [PATCH] serial: 16550: Add JZ47xx support

[Marek Vasut]

On 05/26/2016 12:17 AM, Daniel Schwierzeck wrote:
> 
> 
> Am 25.05.2016 um 02:19 schrieb Marek Vasut:
>> The Ingenic JZ47xx requires special bit (UART_EN) set in FCR register
>> in order to work at all. Add this special case handling into the driver.
>>
>> Signed-off-by: Marek Vasut <marex at denx.de>
>> Cc: Tom Rini <trini at konsulko.com>
>> Cc: Simon Glass <sjg at chromium.org>
>> Cc: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>
>> Cc: Paul Burton <paul.burton at imgtec.com>
>> ---
>>  drivers/serial/ns16550.c | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
>> index 30ba0aa..1323881 100644
>> --- a/drivers/serial/ns16550.c
>> +++ b/drivers/serial/ns16550.c
>> @@ -50,6 +50,14 @@ DECLARE_GLOBAL_DATA_PTR;
>>  #endif
>>  #endif
>>  
>> +#ifdef CONFIG_ARCH_JZ47XX
>> +#undef UART_FCRVAL
>> +/* Ingenic JZ47xx SoCs require that a 'UART Module Enable' bit be set */
>> +#define UART_FCR_UME		0x10
>> +#define UART_FCRVAL (UART_FCR_FIFO_EN | UART_FCR_RXSR |	\
>> +		     UART_FCR_TXSR | UART_FCR_UME)
>> +#endif
> 
> I think this could be added as DT property

Not for SPL, which has 14 kiB size limit and it is itching to overflow.
I am literally counting bytes in the SPL and removing slop from
structures to make it fit, just barely. With the USB loader, I can
brutalize the SPL into having extremely rudimentary UART support now
(like printch() being the most advanced output mechanism, but you can
only use it three times, otherwise the code won't fit and the board is
eaten by demons) and this is where this patch comes into play.

So yes, for full u-boot, this _should_ be part of DT. For SPL, please apply.

>> +
>>  #ifndef CONFIG_SYS_NS16550_IER
>>  #define CONFIG_SYS_NS16550_IER  0x00
>>  #endif /* CONFIG_SYS_NS16550_IER */
>>
> 


-- 
Best regards,
Marek Vasut