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| author | Simon Horman | 2011-06-21 01:00:10 +0200 |
|---|---|---|
| committer | Chris Ball | 2011-07-20 23:20:57 +0200 |
| commit | 973ed3af1a570612771ed10dec6506c757767668 (patch) | |
| tree | db993034cacfcc3f3388c43d96459a123adc32a2 /drivers/mmc/host/tmio_mmc.h | |
| parent | mmc: tmio: Share register access functions (diff) | |
| download | kernel-qcow2-linux-973ed3af1a570612771ed10dec6506c757767668.tar.gz kernel-qcow2-linux-973ed3af1a570612771ed10dec6506c757767668.tar.xz kernel-qcow2-linux-973ed3af1a570612771ed10dec6506c757767668.zip | |
mmc: sdhi: Add write16_hook
Some controllers require waiting for the bus to become idle
before writing to some registers. I have implemented this
by adding a hook to sd_ctrl_write16() and implementing
a hook for SDHI which waits for the bus to become idle.
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Magnus Damm <magnus.damm@gmail.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/host/tmio_mmc.h')
| -rw-r--r-- | drivers/mmc/host/tmio_mmc.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h index 0c22df0f954d..211ef6e7a820 100644 --- a/drivers/mmc/host/tmio_mmc.h +++ b/drivers/mmc/host/tmio_mmc.h @@ -153,6 +153,11 @@ static inline u32 sd_ctrl_read32(struct tmio_mmc_host *host, int addr) static inline void sd_ctrl_write16(struct tmio_mmc_host *host, int addr, u16 val) { + /* If there is a hook and it returns non-zero then there + * is an error and the write should be skipped + */ + if (host->pdata->write16_hook && host->pdata->write16_hook(host, addr)) + return; writew(val, host->ctl + (addr << host->bus_shift)); } |