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mmc: Allow host drivers to specify max block count

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Many controllers have an upper limit on the number of blocks that can be
transferred in one request. Allow the host drivers to specify this and make
sure we avoid hitting this limit.

Also change the max_sectors field to avoid confusion. This makes it map
less directly to the block layer limits, but as they didn't apply directly
on MMC cards anyway, this isn't a great loss.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman
2006-11-21 17:55:45 +01:00
parent fe4a3c7a20
commit 55db890a83
13 changed files with 55 additions and 22 deletions
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9
drivers/mmc/tifm_sd.c
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@@ -885,10 +885,13 @@ static int tifm_sd_probe(struct tifm_dev *sock)
mmc->f_max = 24000000;
mmc->max_hw_segs = 1;
mmc->max_phys_segs = 1;
mmc->max_sectors = 127;
//2k maximum hw block length
mmc->max_seg_size = mmc->max_sectors << 11;
// limited by DMA counter - it's safer to stick with
// block counter has 11 bits though
mmc->max_blk_count = 256;
// 2k maximum hw block length
mmc->max_blk_size = 2048;
mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
mmc->max_seg_size = mmc->max_req_size;
sock->signal_irq = tifm_sd_signal_irq;
rc = tifm_sd_initialize_host(host);