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| author | Andre Przywara <andre.przywara@linaro.org> | 2013-08-19 12:19:28 +0200 |
|---|---|---|
| committer | Rob Herring <rob.herring@calxeda.com> | 2013-08-22 20:48:38 -0500 |
| commit | 1c38b28980f15c5d217d6b36cd8159c2fbdfeb43 (patch) | |
| tree | 6a074c8f7e6a658e4d7c4649b32f3b93927e57fd /drivers/dma/amba-pl08x.c | |
| parent | 2c634946253d68039fef5a44295e4bc9c62163c8 (diff) | |
| download | linux-1c38b28980f15c5d217d6b36cd8159c2fbdfeb43.tar.bz2 | |
DMA: fix AMBA PL08x compilation issue with 64bit DMA address type
When dma_addr_t is 64 bits long, compilation of the AMBA PL08x DMA
driver breaks due to a missing 64bit%8bit modulo operation.
Looking more closely the divisor in these operations can only be
1, 2 or 4, so the full featured '%' modulo operation is overkill and
can be replaced with simple bit masking.
Change from v1:
Replace open-coded function with existing IS_ALIGNED macro and use a
macro around that to avoid a line becoming too long.
Signed-off-by: Andre Przywara <andre.przywara@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Diffstat (limited to 'drivers/dma/amba-pl08x.c')
| -rw-r--r-- | drivers/dma/amba-pl08x.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c index 06fe45c74de5..fb3ce9eefca7 100644 --- a/drivers/dma/amba-pl08x.c +++ b/drivers/dma/amba-pl08x.c @@ -133,6 +133,8 @@ struct pl08x_bus_data { u8 buswidth; }; +#define IS_BUS_ALIGNED(bus) IS_ALIGNED((bus)->addr, (bus)->buswidth) + /** * struct pl08x_phy_chan - holder for the physical channels * @id: physical index to this channel @@ -886,8 +888,8 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, return 0; } - if ((bd.srcbus.addr % bd.srcbus.buswidth) || - (bd.dstbus.addr % bd.dstbus.buswidth)) { + if (!IS_BUS_ALIGNED(&bd.srcbus) || + !IS_BUS_ALIGNED(&bd.dstbus)) { dev_err(&pl08x->adev->dev, "%s src & dst address must be aligned to src" " & dst width if peripheral is flow controller", @@ -908,9 +910,9 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, */ if (bd.remainder < mbus->buswidth) early_bytes = bd.remainder; - else if ((mbus->addr) % (mbus->buswidth)) { - early_bytes = mbus->buswidth - (mbus->addr) % - (mbus->buswidth); + else if (!IS_BUS_ALIGNED(mbus)) { + early_bytes = mbus->buswidth - + (mbus->addr & (mbus->buswidth - 1)); if ((bd.remainder - early_bytes) < mbus->buswidth) early_bytes = bd.remainder; } @@ -928,7 +930,7 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, * Master now aligned * - if slave is not then we must set its width down */ - if (sbus->addr % sbus->buswidth) { + if (!IS_BUS_ALIGNED(sbus)) { dev_dbg(&pl08x->adev->dev, "%s set down bus width to one byte\n", __func__); |