u-boot

mirror of https://github.com/Stichting-MINIX-Research-Foundation/u-boot.git synced 2025-08-18 03:06:07 -04:00

History

Priyanka Jain b71ea33699 fsl_esdhc: Correcting esdhc timeout counter calculation

- Timeout counter value is set as DTOCV bits in SYSCTL register
  For counter value set as timeout,
  Timeout period = (2^(timeout + 13)) SD Clock cycles

- As per 4.6.2.2 section of SD Card specification v2.00, host should
  cofigure timeout period value to minimum 0.25 sec.

- Number of SD Clock cycles for 0.25sec should be minimum
	(SD Clock/sec * 0.25 sec) SD Clock cycles
	= (mmc->tran_speed * 1/4) SD Clock cycles

- Calculating timeout based on
	(2^(timeout + 13)) >=  mmc->tran_speed * 1/4
	Taking log2 both the sides and rounding up to next power of 2
	=> timeout + 13 = log2(mmc->tran_speed/4) + 1

Signed-off-by: Priyanka Jain <Priyanka.Jain@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
Acked-by: Mingkai Hu <Mingkai.Hu@freescale.com>
Tested-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

2011-03-07 08:49:28 -06:00

atmel_mci.c

Convert mmc_init to mmc_legacy_init

2009-02-16 18:07:40 -06:00

atmel_mci.h

AT91: MCI: add SD/MMC driver using mmc framework

2010-09-03 11:19:01 +02:00

bfin_sdh.c

Blackfin: bfin_sdh: clean up send_cmd

2010-10-02 16:00:37 -04:00

davinci_mmc.c

Minor Coding Style Cleanup.