hw/lpc-mbox: Add skiboot driver for the AST BMC mbox registers

This adds an internal skiboot API for accessing the AST BMC mbox
registers.

Signed-off-by: Cyril Bur <cyril.bur@au1.ibm.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

2 files changed, 59 insertions, 0 deletions

diff --git a/include/lpc-mbox.h b/include/lpc-mbox.h
new file mode 100644
index 0000000..c67efee
--- /dev/null
+++ b/include/lpc-mbox.h
@@ -0,0 +1,58 @@
+/* Copyright 2017 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_MBOX_H
+#define __LPC_MBOX_H
+
+#include <opal.h>
+#include <ccan/endian/endian.h>
+
+/* Not 16 because the last two are interrupt based status regs */
+#define BMC_MBOX_DATA_REGS 14
+#define BMC_MBOX_ARGS_REGS 11
+
+#define MBOX_C_RESET_STATE 0x01
+#define MBOX_C_GET_MBOX_INFO 0x02
+#define MBOX_C_GET_FLASH_INFO 0x03
+#define MBOX_C_CREATE_READ_WINDOW 0x04
+#define MBOX_C_CLOSE_WINDOW 0x05
+#define MBOX_C_CREATE_WRITE_WINDOW 0x06
+#define MBOX_C_MARK_WRITE_DIRTY 0x07
+#define MBOX_C_WRITE_FLUSH 0x08
+#define MBOX_C_BMC_EVENT_ACK 0x09
+
+#define MBOX_R_SUCCESS 0x01
+#define MBOX_R_PARAM_ERROR 0x02
+#define MBOX_R_WRITE_ERROR 0x03
+#define MBOX_R_SYSTEM_ERROR 0x04
+#define MBOX_R_TIMEOUT 0x05
+
+/* Default poll interval before interrupts are working */
+#define MBOX_DEFAULT_POLL_MS	200
+
+struct bmc_mbox_msg {
+	uint8_t command;
+	uint8_t seq;
+	uint8_t args[BMC_MBOX_ARGS_REGS];
+	uint8_t response;
+	uint8_t host;
+	uint8_t bmc;
+};
+
+int bmc_mbox_enqueue(struct bmc_mbox_msg *msg);
+int bmc_mbox_register_callback(void (*callback)(struct bmc_mbox_msg *msg, void *priv),
+		void *drv_data);
+#endif /* __LPC_MBOX_H */
diff --git a/include/skiboot.h b/include/skiboot.h
index 33447a4..7904eee 100644
--- a/include/skiboot.h
+++ b/include/skiboot.h
@@ -216,6 +216,7 @@ extern int phb4_preload_capp_ucode(void);
 extern void phb4_preload_vpd(void);
 extern void probe_npu(void);
 extern void uart_init(void);
+extern void mbox_init(void);
 extern void homer_init(void);
 extern void occ_pstates_init(void);
 extern void slw_init(void);