diff options
author | Ira Snyder <iws@ovro.caltech.edu> | 2010-01-06 16:33:59 +0300 |
---|---|---|
committer | Dan Williams <dan.j.williams@intel.com> | 2010-02-03 00:51:40 +0300 |
commit | 272ca655090978bdaa2630fc44fb2c03da5576fd (patch) | |
tree | 3ad63195951405f4a51c44f1a57f125415d649e6 /drivers/dma/fsldma.c | |
parent | abe94c756c08d50566c09a65b9c7fe72f83071c5 (diff) | |
download | linux-272ca655090978bdaa2630fc44fb2c03da5576fd.tar.xz |
fsldma: reduce kernel text size
Some of the functions are written in a way where they use multiple reads
and writes where a single read/write pair could suffice. This shrinks the
kernel text size measurably, while making the functions easier to
understand.
add/remove: 0/0 grow/shrink: 1/4 up/down: 4/-196 (-192)
function old new delta
fsl_chan_set_request_count 120 124 +4
dma_halt 300 272 -28
fsl_chan_set_src_loop_size 208 156 -52
fsl_chan_set_dest_loop_size 208 156 -52
fsl_chan_xfer_ld_queue 500 436 -64
Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma/fsldma.c')
-rw-r--r-- | drivers/dma/fsldma.c | 83 |
1 files changed, 45 insertions, 38 deletions
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c index 296f9e747fac..0bad741765c6 100644 --- a/drivers/dma/fsldma.c +++ b/drivers/dma/fsldma.c @@ -143,43 +143,45 @@ static int dma_is_idle(struct fsl_dma_chan *fsl_chan) static void dma_start(struct fsl_dma_chan *fsl_chan) { - u32 mr_set = 0; - - if (fsl_chan->feature & FSL_DMA_CHAN_PAUSE_EXT) { - DMA_OUT(fsl_chan, &fsl_chan->reg_base->bcr, 0, 32); - mr_set |= FSL_DMA_MR_EMP_EN; - } else if ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) { - DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, - DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) - & ~FSL_DMA_MR_EMP_EN, 32); + u32 mode; + + mode = DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32); + + if ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) { + if (fsl_chan->feature & FSL_DMA_CHAN_PAUSE_EXT) { + DMA_OUT(fsl_chan, &fsl_chan->reg_base->bcr, 0, 32); + mode |= FSL_DMA_MR_EMP_EN; + } else { + mode &= ~FSL_DMA_MR_EMP_EN; + } } if (fsl_chan->feature & FSL_DMA_CHAN_START_EXT) - mr_set |= FSL_DMA_MR_EMS_EN; + mode |= FSL_DMA_MR_EMS_EN; else - mr_set |= FSL_DMA_MR_CS; + mode |= FSL_DMA_MR_CS; - DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, - DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) - | mr_set, 32); + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, mode, 32); } static void dma_halt(struct fsl_dma_chan *fsl_chan) { + u32 mode; int i; - DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, - DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | FSL_DMA_MR_CA, - 32); - DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, - DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) & ~(FSL_DMA_MR_CS - | FSL_DMA_MR_EMS_EN | FSL_DMA_MR_CA), 32); + mode = DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32); + mode |= FSL_DMA_MR_CA; + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, mode, 32); + + mode &= ~(FSL_DMA_MR_CS | FSL_DMA_MR_EMS_EN | FSL_DMA_MR_CA); + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, mode, 32); for (i = 0; i < 100; i++) { if (dma_is_idle(fsl_chan)) break; udelay(10); } + if (i >= 100 && !dma_is_idle(fsl_chan)) dev_err(fsl_chan->dev, "DMA halt timeout!\n"); } @@ -231,22 +233,23 @@ static void append_ld_queue(struct fsl_dma_chan *fsl_chan, */ static void fsl_chan_set_src_loop_size(struct fsl_dma_chan *fsl_chan, int size) { + u32 mode; + + mode = DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32); + switch (size) { case 0: - DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, - DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) & - (~FSL_DMA_MR_SAHE), 32); + mode &= ~FSL_DMA_MR_SAHE; break; case 1: case 2: case 4: case 8: - DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, - DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | - FSL_DMA_MR_SAHE | (__ilog2(size) << 14), - 32); + mode |= FSL_DMA_MR_SAHE | (__ilog2(size) << 14); break; } + + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, mode, 32); } /** @@ -262,22 +265,23 @@ static void fsl_chan_set_src_loop_size(struct fsl_dma_chan *fsl_chan, int size) */ static void fsl_chan_set_dest_loop_size(struct fsl_dma_chan *fsl_chan, int size) { + u32 mode; + + mode = DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32); + switch (size) { case 0: - DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, - DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) & - (~FSL_DMA_MR_DAHE), 32); + mode &= ~FSL_DMA_MR_DAHE; break; case 1: case 2: case 4: case 8: - DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, - DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | - FSL_DMA_MR_DAHE | (__ilog2(size) << 16), - 32); + mode |= FSL_DMA_MR_DAHE | (__ilog2(size) << 16); break; } + + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, mode, 32); } /** @@ -294,11 +298,14 @@ static void fsl_chan_set_dest_loop_size(struct fsl_dma_chan *fsl_chan, int size) */ static void fsl_chan_set_request_count(struct fsl_dma_chan *fsl_chan, int size) { + u32 mode; + BUG_ON(size > 1024); - DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, - DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) - | ((__ilog2(size) << 24) & 0x0f000000), - 32); + + mode = DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32); + mode |= (__ilog2(size) << 24) & 0x0f000000; + + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, mode, 32); } /** |