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authorTony Lindgren <tony@atomide.com>2014-04-21 19:26:13 -0700
committerTony Lindgren <tony@atomide.com>2014-04-23 11:09:22 -0700
commitfb677ef70b65e22cd4401d31b700a8b4041efae1 (patch)
treefb444ab0ef4702908c40f2f68ef6b320d73adea4 /arch
parentefe8072316a899294212055c147d3d9adca940a4 (diff)
downloadlinux-fb677ef70b65e22cd4401d31b700a8b4041efae1.tar.bz2
ARM: OMAP2+: Fix GPMC remap for devices using an offset
At least the smc91x driver expects the device to be at 0x300 offset from bus base address. This does not work currently for GPMC when booted in device tree mode as it attempts to remap the the allocated GPMC partition to the address configured by the device tree plus the device offset. Note that this works just fine when booted with legacy mode. Let's fix the issue by just ignoring any device specific offset while remapping. And let's make sure the remap address confirms to the GPMC 16MB minimum granularity as listed in the TRM for GPMC_CONFIG7 BASEADDRESS bits. Otherwise we can get something like this: omap-gpmc 6e000000.gpmc: cannot remap GPMC CS 1 to 0x01000300 Cc: Pekon Gupta <pekon@ti.com> Reviewed-by: Javier Martinez Canillas <javier@dowhile0.org> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-omap2/gpmc.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index 84e57e6fbc26..9fe8c949305c 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -527,6 +527,14 @@ static int gpmc_cs_remap(int cs, u32 base)
pr_err("%s: requested chip-select is disabled\n", __func__);
return -ENODEV;
}
+
+ /*
+ * Make sure we ignore any device offsets from the GPMC partition
+ * allocated for the chip select and that the new base confirms
+ * to the GPMC 16MB minimum granularity.
+ */
+ base &= ~(SZ_16M - 1);
+
gpmc_cs_get_memconf(cs, &old_base, &size);
if (base == old_base)
return 0;