mcp251xfd-dump: add tool to decode chip and driver state of mcp251xfd

It works on dev coredump data generated by the mcp251xfd driver in
case of failures, as well as on regmap based register dumps.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

include/linux/kernel.h

@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _LINUX_KERNEL_H
+#define _LINUX_KERNEL_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdbool.h>
+
+#include <linux/can.h>
+
+typedef uint8_t u8;
+typedef uint16_t u16;
+typedef uint32_t u32;
+typedef uint32_t __le32;
+
+struct mcp251xfd_mem;
+
+struct regmap {
+	struct mcp251xfd_mem *mem;
+};
+
+#define pr_info(...) fprintf(stdout, ## __VA_ARGS__)
+#define pr_cont(...) fprintf(stdout, ## __VA_ARGS__)
+#define netdev_info(ndev, ...) fprintf(stdout, ## __VA_ARGS__)
+#define BUILD_BUG_ON(...)
+
+#define BITS_PER_LONG (sizeof(long) * 8)
+
+#define ____cacheline_aligned
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+int regmap_bulk_read(struct regmap *map, unsigned int reg,
+		     void *val, size_t val_count);
+
+#define SZ_2K				0x00000800
+
+#define __packed                        __attribute__((__packed__))
+
+#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
+
+#define BIT(nr)			(UL(1) << (nr))
+
+#define __stringify_1(x...)	#x
+#define __stringify(x...)	__stringify_1(x)
+
+#ifdef __ASSEMBLY__
+#define _AC(X,Y)	X
+#define _AT(T,X)	X
+#else
+#define __AC(X,Y)	(X##Y)
+#define _AC(X,Y)	__AC(X,Y)
+#define _AT(T,X)	((T)(X))
+#endif
+
+#define _UL(x)		(_AC(x, UL))
+#define _ULL(x)		(_AC(x, ULL))
+
+#define UL(x)		(_UL(x))
+#define ULL(x)		(_ULL(x))
+
+#define GENMASK(h, l) \
+	(((~UL(0)) - (UL(1) << (l)) + 1) & \
+	 (~UL(0) >> (BITS_PER_LONG - 1 - (h))))
+
+#define __bf_shf(x) (__builtin_ffsll(x) - 1)
+
+#define FIELD_PREP(_mask, _val)						\
+	({								\
+		((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask);	\
+	})
+
+#define FIELD_GET(_mask, _reg)						\
+	({								\
+		(typeof(_mask))(((_reg) & (_mask)) >> __bf_shf(_mask));	\
+	})
+
+#define min_t(type, x, y) ({			\
+	type __min1 = (x);			\
+	type __min2 = (y);			\
+	__min1 < __min2 ? __min1 : __min2; })
+
+#define get_canfd_dlc(i)	(min_t(__u8, (i), CANFD_MAX_DLC))
+
+static const u8 dlc2len[] = {0, 1, 2, 3, 4, 5, 6, 7,
+			     8, 12, 16, 20, 24, 32, 48, 64};
+
+/* get data length from can_dlc with sanitized can_dlc */
+static inline u8 can_dlc2len(u8 can_dlc)
+{
+	return dlc2len[can_dlc & 0x0F];
+}
+
+#endif /* _LINUX_KERNEL_H */