1 files changed, 38 insertions, 0 deletions
diff --git a/common.h b/common.h
new file mode 100644
index 0000000..b5594e9
--- /dev/null
+++ b/common.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _COMMON_H
+#define _COMMON_H
+
+#include <string.h>
+
+#include "ccan/endian/endian.h"
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+#define min(x, y) ((x) > (y) ? (y) : (x))
+#define max(x, y) ((x) > (y) ? (x) : (y))
+
+#ifdef __packed
+#else /* __packed */
+#define __packed __attribute__((__packed__))
+#endif /* __packed */
+
+static inline uint32_t mmio_read32(void *addr)
+{
+	leint32_t *p = addr;
+
+	return le32_to_cpu(*p);
+}
+
+/* Access 64-bit registers as 2 32-bit; Some devices fail 64-bit MMIO. */
+static inline uint64_t mmio_read64(void *addr)
+{
+	const volatile uint32_t *p = addr;
+	uint32_t low, high;
+
+	low = le32_to_cpu(*p);
+	high = le32_to_cpu(*(p + 1));
+
+	return ((uint64_t) high << 32) | low;
+}
+
+#endif