[U-Boot] [RFC] setting pio modes for IDE devices

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>]

> ---
>  common/cmd_ide.c |   52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
>  include/ata.h    |    4 +++-
>  2 files changed, 55 insertions(+), 1 deletions(-)
> 
> diff --git a/common/cmd_ide.c b/common/cmd_ide.c
> index b4d9719..0e435a7 100644
> --- a/common/cmd_ide.c
> +++ b/common/cmd_ide.c
> @@ -167,6 +167,10 @@ static void input_data(int dev, ulong *sect_buf, int words);
>  static void output_data(int dev, ulong *sect_buf, int words);
>  static void ident_cpy (unsigned char *dest, unsigned char *src, unsigned int len);
>  
> +#ifdef CONFIG_TUNE_PIO
> +int inline ide_set_piomode(int pio_mode);
> +#endif
> +
>  #ifndef CFG_ATA_PORT_ADDR
>  #define CFG_ATA_PORT_ADDR(port) (port)
>  #endif
> @@ -838,6 +842,16 @@ __ide_inb(int dev, int port)
>  unsigned char inline ide_inb(int dev, int port)
>  			__attribute__((weak, alias("__ide_inb")));
>  
why not do this?

int inline ide_set_piomode(int pio_mode) __attribute__((weak));
>  #ifdef __PPC__
>  # ifdef CONFIG_AMIGAONEG3SE
>  static void
> @@ -1054,6 +1068,10 @@ static void ide_ident (block_dev_desc_t *dev_desc)
>  	int do_retry = 0;
>  #endif
>  
> +#ifdef CONFIG_TUNE_PIO
> +	int pio_mode;
> +#endif
> +
>  #if 0
>  	int mode, cycle_time;
>  #endif
> @@ -1169,6 +1187,40 @@ static void ide_ident (block_dev_desc_t *dev_desc)
>  	else
>  		dev_desc->removable = 0;
>  
> +#ifdef CONFIG_TUNE_PIO
> +	/* Mode 0 - 2 only, are directly determined by word 51. */
> +	pio_mode = iop->tPIO;
> +	if(pio_mode > 2) {
> +		printf("WARNING: Invalid PIO (word 51 = %d).\n", pio_mode);
> +		pio_mode = 0; /* Force it to dead slow, and hope for the best... */
> +	}
> +
> +	/* Any CompactFlash Storage Card that supports PIO mode 3 or above
> +	 * shall set bit 1 of word 53 to one and support the fields contained
> +	 * in words 64 through 70.
> +	 */
> +	if(iop->field_valid & 0x02) {
> +		/* Mode 3 and above are possible.  Check in order from slow
> +		 * to fast, so we wind up with the highest mode allowed.
> +		 */
> +		if(iop->eide_pio_modes & 0x01) {
> +			pio_mode = 3;
> +		}
> +		if(iop->eide_pio_modes & 0x02) {
> +			pio_mode = 4;
> +		}
> +		if((iop->cf_advanced_caps & 0x07) == 0x01) {
> +			pio_mode = 5;
> +		}
> +		if((iop->cf_advanced_caps & 0x07) == 0x02) {
> +			pio_mode = 6;
> +		}
> +	}
> +
> +	/* System-specific, depends on bus speeds, etc. */

	if(ide_set_piomode)
		ide_set_piomode(pio_mode);

if no ide_set_piomode implementation is present gcc will drop it at
compile time IIRC.

Best Regards,
J.