Each GPMC chip-select can be configured to map 16MB, 32MB, 64MB or 128MB
of address space. The physical base address where a chip-select starts
is also configurable and must be aligned on a boundary that is equal to
or greater than the size of the address space mapped bt the chip-select.
When enabling a GPMC chip-select, ensure that the base address is aligned
to the appropriate boundary.
Reported-by: Mark Jackson <mpfj-list@xxxxxxxxxx>
Signed-off-by: Jon Hunter <jon-hunter@xxxxxx>
---
arch/arm/mach-omap2/gpmc.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index c928a8c..a6f2b71 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -403,11 +403,18 @@ int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t)
return 0;
}
-static void gpmc_cs_enable_mem(int cs, u32 base, u32 size)
+static int gpmc_cs_enable_mem(int cs, u32 base, u32 size)
{
u32 l;
u32 mask;
+ /*
+ * Ensure that base address is aligned on a
+ * boundary equal to or greater than size.
+ */
+ if (base & (size - 1))
+ return -EINVAL;
+
mask = (1 << GPMC_SECTION_SHIFT) - size;
l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
l &= ~0x3f;
@@ -416,6 +423,8 @@ static void gpmc_cs_enable_mem(int cs, u32 base, u32 size)
l |= ((mask >> GPMC_CHUNK_SHIFT) & 0x0f) << 8;
l |= GPMC_CONFIG7_CSVALID;
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
+
+ return 0;
}
static void gpmc_cs_disable_mem(int cs)
@@ -526,7 +535,9 @@ static int gpmc_cs_remap(int cs, u32 base)
ret = gpmc_cs_insert_mem(cs, base, size);
if (ret < 0)
return ret;
- gpmc_cs_enable_mem(cs, base, size);
+ ret = gpmc_cs_enable_mem(cs, base, size);
+ if (ret < 0)
+ return ret;
return 0;
}
@@ -556,7 +567,12 @@ int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
if (r < 0)
goto out;
- gpmc_cs_enable_mem(cs, res->start, resource_size(res));
+ r = gpmc_cs_enable_mem(cs, res->start, resource_size(res));
+ if (r < 0) {
+ release_resource(res);
+ goto out;
+ }
+
*base = res->start;
gpmc_cs_set_reserved(cs, 1);
out:
--
1.7.10.4
--
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