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authorWilliam Juul <william.juul@datarespons.no>2007-10-31 13:53:06 +0100
committerScott Wood <scottwood@freescale.com>2008-08-12 11:31:15 -0500
commitcfa460adfdefcc30d104e1a9ee44994ee349bb7b (patch)
tree59400f96629aec9c968b0e3251628302824f5d35 /include/linux/err.h
parentcd82919e6c8a73b363a26f34b734923844e52d1c (diff)
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Update MTD to that of Linux 2.6.22.1
A lot changed in the Linux MTD code, since it was last ported from Linux to U-Boot. This patch takes U-Boot NAND support to the level of Linux 2.6.22.1 and will enable support for very large NAND devices (4KB pages) and ease the compatibility between U-Boot and Linux filesystems. This patch is tested on two custom boards with PPC and ARM processors running YAFFS in U-Boot and Linux using gcc-4.1.2 cross compilers. MAKEALL ppc/arm has some issues: * DOC/OneNand/nand_spl is not building (I have not tried porting these parts, and since I do not have any HW and I am not familiar with this code/HW I think its best left to someone else.) Except for the issues mentioned above, I have ported all drivers necessary to run MAKEALL ppc/arm without errors and warnings. Many drivers were trivial to port, but some were not so trivial. The following drivers must be examined carefully and maybe rewritten to some degree: cpu/ppc4xx/ndfc.c cpu/arm926ejs/davinci/nand.c board/delta/nand.c board/zylonite/nand.c Signed-off-by: William Juul <william.juul@tandberg.com> Signed-off-by: Stig Olsen <stig.olsen@tandberg.com> Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'include/linux/err.h')
-rw-r--r--include/linux/err.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/include/linux/err.h b/include/linux/err.h
new file mode 100644
index 0000000..4e08c4f
--- /dev/null
+++ b/include/linux/err.h
@@ -0,0 +1,45 @@
+#ifndef _LINUX_ERR_H
+#define _LINUX_ERR_H
+
+/* XXX U-BOOT XXX */
+#if 0
+#include <linux/compiler.h>
+#else
+#include <linux/mtd/compat.h>
+#endif
+
+#include <asm/errno.h>
+
+
+/*
+ * Kernel pointers have redundant information, so we can use a
+ * scheme where we can return either an error code or a dentry
+ * pointer with the same return value.
+ *
+ * This should be a per-architecture thing, to allow different
+ * error and pointer decisions.
+ */
+#define MAX_ERRNO 4095
+
+#ifndef __ASSEMBLY__
+
+#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
+
+static inline void *ERR_PTR(long error)
+{
+ return (void *) error;
+}
+
+static inline long PTR_ERR(const void *ptr)
+{
+ return (long) ptr;
+}
+
+static inline long IS_ERR(const void *ptr)
+{
+ return IS_ERR_VALUE((unsigned long)ptr);
+}
+
+#endif
+
+#endif /* _LINUX_ERR_H */