1 files changed, 95 insertions, 0 deletions
diff --git a/include/lpc.h b/include/lpc.h
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+++ b/include/lpc.h
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+/* Copyright 2013-2014 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * 	http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __LPC_H
+#define __LPC_H
+
+#include <opal.h>
+#include <ccan/endian/endian.h>
+
+/* Routines for accessing the LPC bus on Power8 */
+
+extern void lpc_init(void);
+
+/* Check for a default bus */
+extern bool lpc_present(void);
+
+/* Default bus accessors */
+extern int64_t lpc_write(enum OpalLPCAddressType addr_type, uint32_t addr,
+			 uint32_t data, uint32_t sz);
+extern int64_t lpc_read(enum OpalLPCAddressType addr_type, uint32_t addr,
+			uint32_t *data, uint32_t sz);
+
+/* Mark LPC bus as used by console */
+extern void lpc_used_by_console(void);
+
+/*
+ * Simplified big endian FW accessors
+ */
+static inline int64_t lpc_fw_read32(uint32_t *val, uint32_t addr)
+{
+	return lpc_read(OPAL_LPC_FW, addr, val, 4);
+}
+
+static inline int64_t lpc_fw_write32(uint32_t val, uint32_t addr)
+{
+	return lpc_write(OPAL_LPC_FW, addr, cpu_to_be64(val), 4);
+}
+
+
+/*
+ * Simplified Little Endian IO space accessors
+ *
+ * Note: We do *NOT* handle unaligned accesses
+ */
+
+static inline void lpc_outb(uint8_t data, uint32_t addr)
+{
+	lpc_write(OPAL_LPC_IO, addr, data, 1);
+}
+
+static inline uint8_t lpc_inb(uint32_t addr)
+{
+	uint32_t d32;
+	int64_t rc = lpc_read(OPAL_LPC_IO, addr, &d32, 1);
+	return (rc == OPAL_SUCCESS) ? d32 : 0xff;
+}
+
+static inline void lpc_outw(uint16_t data, uint32_t addr)
+{
+	lpc_write(OPAL_LPC_IO, addr, cpu_to_le16(data), 2);
+}
+
+static inline uint16_t lpc_inw(uint32_t addr)
+{
+	uint32_t d32;
+	int64_t rc = lpc_read(OPAL_LPC_IO, addr, &d32, 2);
+	return (rc == OPAL_SUCCESS) ? le16_to_cpu(d32) : 0xffff;
+}
+
+static inline void lpc_outl(uint32_t data, uint32_t addr)
+{
+	lpc_write(OPAL_LPC_IO, addr, cpu_to_le32(data), 4);
+}
+
+static inline uint32_t lpc_inl(uint32_t addr)
+{
+	uint32_t d32;
+	int64_t rc = lpc_read(OPAL_LPC_IO, addr, &d32, 4);
+	return (rc == OPAL_SUCCESS) ? le32_to_cpu(d32) : 0xffffffff;
+}
+
+#endif /* __LPC_H */