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| author | Jens Gehrlein <sew_s@tqs.de> | 2008-12-16 17:25:55 +0100 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2009-01-26 10:50:13 +0100 |
| commit | 0f8e851e897b535959a0781171910cd97f33c30c (patch) | |
| tree | c592c555c5ea4f5b3a8b61de047c67b614a1757f /drivers/mtd | |
| parent | a7292871a79cc48d98e3a708dd3c3b81580db6ef (diff) | |
| download | u-boot-imx-0f8e851e897b535959a0781171910cd97f33c30c.zip u-boot-imx-0f8e851e897b535959a0781171910cd97f33c30c.tar.gz u-boot-imx-0f8e851e897b535959a0781171910cd97f33c30c.tar.bz2 | |
CFI: increase performance of function find_sector()
Tested on TQM5200S-BD with Samsung K8P2815UQB
Signed-off-by: Jens Gehrlein <sew_s@tqs.de>
Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/cfi_flash.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index 1bd0e2b..bc5e151 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -774,17 +774,26 @@ static void flash_add_byte (flash_info_t * info, cfiword_t * cword, uchar c) } } -/* loop through the sectors from the highest address when the passed - * address is greater or equal to the sector address we have a match +/* + * Loop through the sector table starting from the previously found sector. + * Searches forwards or backwards, dependent on the passed address. */ static flash_sect_t find_sector (flash_info_t * info, ulong addr) { - flash_sect_t sector; + static flash_sect_t saved_sector = 0; /* previously found sector */ + flash_sect_t sector = saved_sector; - for (sector = info->sector_count - 1; sector >= 0; sector--) { - if (addr >= info->start[sector]) - break; - } + while ((info->start[sector] < addr) + && (sector < info->sector_count - 1)) + sector++; + while ((info->start[sector] > addr) && (sector > 0)) + /* + * also decrements the sector in case of an overshot + * in the first loop + */ + sector--; + + saved_sector = sector; return sector; } |