mips: octeon: Add header cvmx-fuse.h

Add header to handle Octeon fuse access.

Signed-off-by: Aaron Williams <awilliams@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>

diff --git a/arch/mips/mach-octeon/include/mach/cvmx-fuse.h b/arch/mips/mach-octeon/include/mach/cvmx-fuse.h
new file mode 100644 (file)
index 0000000..a06a132
--- /dev/null
+++ b/arch/mips/mach-octeon/include/mach/cvmx-fuse.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 Marvell International Ltd.
+ */
+
+#ifndef __CVMX_FUSE_H__
+#define __CVMX_FUSE_H__
+
+/**
+ * Read a byte of fuse data
+ * @param node         node to read from
+ * @param byte_addr    address to read
+ *
+ * @return fuse value: 0 or 1
+ */
+static inline u8 cvmx_fuse_read_byte_node(u8 node, int byte_addr)
+{
+       u64 val;
+
+       val = FIELD_PREP(MIO_FUS_RCMD_ADDR, byte_addr) | MIO_FUS_RCMD_PEND;
+       csr_wr_node(node, CVMX_MIO_FUS_RCMD, val);
+
+       do {
+               val = csr_rd_node(node, CVMX_MIO_FUS_RCMD);
+       } while (val & MIO_FUS_RCMD_PEND);
+
+       return FIELD_GET(MIO_FUS_RCMD_DAT, val);
+}
+
+/**
+ * Read a byte of fuse data
+ * @param byte_addr   address to read
+ *
+ * @return fuse value: 0 or 1
+ */
+static inline u8 cvmx_fuse_read_byte(int byte_addr)
+{
+       return cvmx_fuse_read_byte_node(0, byte_addr);
+}
+
+/**
+ * Read a single fuse bit
+ *
+ * @param node   Node number
+ * @param fuse   Fuse number (0-1024)
+ *
+ * @return fuse value: 0 or 1
+ */
+static inline int cvmx_fuse_read_node(u8 node, int fuse)
+{
+       return (cvmx_fuse_read_byte_node(node, fuse >> 3) >> (fuse & 0x7)) & 1;
+}
+
+/**
+ * Read a single fuse bit
+ *
+ * @param fuse   Fuse number (0-1024)
+ *
+ * @return fuse value: 0 or 1
+ */
+static inline int cvmx_fuse_read(int fuse)
+{
+       return cvmx_fuse_read_node(0, fuse);
+}
+
+static inline int cvmx_octeon_fuse_locked(void)
+{
+       return cvmx_fuse_read(123);
+}
+
+#endif /* __CVMX_FUSE_H__ */