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authorJohn Schmoller <jschmoller@xes-inc.com>2010-12-02 11:43:10 -0600
committerKumar Gala <galak@kernel.crashing.org>2010-12-13 09:32:15 -0600
commit9fd84915a92058b775fcc8fad4ab4e59fe51cf17 (patch)
tree4c08894e72fa0a94d71365391ac9d8db226795f6 /drivers
parent72c96a6802d9b1c949785d1d152f8bc8666c753d (diff)
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fsl_upm: Add MxMR/MDR synchronization
According to Freescale reference manuals (eg section "13.4.4.2 Programming the UPMs" of the P4080 Reference Manual): "Since the result of any update to the MxMR/MDR register must be in effect before the dummy read or write to the UPM region, a write to MxMR/MDR should be followed immediately by a read of MxMR/MDR." The UPM on a custom P4080-based board did not work without performing a read of MxMR/MDR after a write. Signed-off-by: John Schmoller <jschmoller@xes-inc.com> Signed-off-by: Peter Tyser <ptyser@xes-inc.com> Acked-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mtd/nand/fsl_upm.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/mtd/nand/fsl_upm.c b/drivers/mtd/nand/fsl_upm.c
index 7cb99cb..c33e278 100644
--- a/drivers/mtd/nand/fsl_upm.c
+++ b/drivers/mtd/nand/fsl_upm.c
@@ -21,6 +21,7 @@
static void fsl_upm_start_pattern(struct fsl_upm *upm, u32 pat_offset)
{
clrsetbits_be32(upm->mxmr, MxMR_MAD_MSK, MxMR_OP_RUNP | pat_offset);
+ (void)in_be32(upm->mxmr);
}
static void fsl_upm_end_pattern(struct fsl_upm *upm)
@@ -35,6 +36,7 @@ static void fsl_upm_run_pattern(struct fsl_upm *upm, int width,
void __iomem *io_addr, u32 mar)
{
out_be32(upm->mar, mar);
+ (void)in_be32(upm->mar);
switch (width) {
case 8:
out_8(io_addr, 0x0);