[ARM] msm: shared memory interface for baseband processor ipc

This code provides the low level interface to the "shared memory
state machine" (smsm), and the virtual serial channels (smd), used
to communicate with the baseband processor.  Higher level transports
(rpc, ethernet, AT command channel, etc) ride on top of this.

Signed-off-by: Brian Swetland <swetland@google.com>

2 files changed, 112 insertions, 0 deletions

diff --git a/arch/arm/mach-msm/include/mach/msm_smd.h b/arch/arm/mach-msm/include/mach/msm_smd.h
new file mode 100644
index 000000000000..bdf7731ab680
--- /dev/null
+++ b/arch/arm/mach-msm/include/mach/msm_smd.h
@@ -0,0 +1,107 @@
+/* linux/include/asm-arm/arch-msm/msm_smd.h
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Author: Brian Swetland <swetland@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __ASM_ARCH_MSM_SMD_H
+#define __ASM_ARCH_MSM_SMD_H
+
+typedef struct smd_channel smd_channel_t;
+
+/* warning: notify() may be called before open returns */
+int smd_open(const char *name, smd_channel_t **ch, void *priv,
+             void (*notify)(void *priv, unsigned event));
+
+#define SMD_EVENT_DATA 1
+#define SMD_EVENT_OPEN 2
+#define SMD_EVENT_CLOSE 3
+
+int smd_close(smd_channel_t *ch);
+
+/* passing a null pointer for data reads and discards */
+int smd_read(smd_channel_t *ch, void *data, int len);
+
+/* Write to stream channels may do a partial write and return
+** the length actually written.
+** Write to packet channels will never do a partial write --
+** it will return the requested length written or an error.
+*/
+int smd_write(smd_channel_t *ch, const void *data, int len);
+
+int smd_write_avail(smd_channel_t *ch);
+int smd_read_avail(smd_channel_t *ch);
+
+/* Returns the total size of the current packet being read.
+** Returns 0 if no packets available or a stream channel.
+*/
+int smd_cur_packet_size(smd_channel_t *ch);
+
+/* used for tty unthrottling and the like -- causes the notify()
+** callback to be called from the same lock context as is used
+** when it is called from channel updates
+*/
+void smd_kick(smd_channel_t *ch);
+
+
+#if 0
+/* these are interruptable waits which will block you until the specified
+** number of bytes are readable or writable.
+*/
+int smd_wait_until_readable(smd_channel_t *ch, int bytes);
+int smd_wait_until_writable(smd_channel_t *ch, int bytes);
+#endif
+
+typedef enum
+{
+        SMD_PORT_DS = 0,
+        SMD_PORT_DIAG,
+        SMD_PORT_RPC_CALL,
+        SMD_PORT_RPC_REPLY,
+        SMD_PORT_BT,
+        SMD_PORT_CONTROL,
+        SMD_PORT_MEMCPY_SPARE1,
+        SMD_PORT_DATA1,
+        SMD_PORT_DATA2,
+        SMD_PORT_DATA3,
+        SMD_PORT_DATA4,
+        SMD_PORT_DATA5,
+        SMD_PORT_DATA6,
+        SMD_PORT_DATA7,
+        SMD_PORT_DATA8,
+        SMD_PORT_DATA9,
+        SMD_PORT_DATA10,
+        SMD_PORT_DATA11,
+        SMD_PORT_DATA12,
+        SMD_PORT_DATA13,
+        SMD_PORT_DATA14,
+        SMD_PORT_DATA15,
+        SMD_PORT_DATA16,
+        SMD_PORT_DATA17,
+        SMD_PORT_DATA18,
+        SMD_PORT_DATA19,
+        SMD_PORT_DATA20,
+        SMD_PORT_GPS_NMEA,
+        SMD_PORT_BRIDGE_1,
+        SMD_PORT_BRIDGE_2,
+        SMD_PORT_BRIDGE_3,
+        SMD_PORT_BRIDGE_4,
+        SMD_PORT_BRIDGE_5,
+        SMD_PORT_LOOPBACK,
+        SMD_PORT_CS_APPS_MODEM,
+        SMD_PORT_CS_APPS_DSP,
+        SMD_PORT_CS_MODEM_DSP,
+        SMD_NUM_PORTS,
+} smd_port_id_type;
+
+#endif
diff --git a/arch/arm/mach-msm/include/mach/system.h b/arch/arm/mach-msm/include/mach/system.h
index 574ccc493daf..d2e83f42ba16 100644
--- a/arch/arm/mach-msm/include/mach/system.h
+++ b/arch/arm/mach-msm/include/mach/system.h
@@ -21,3 +21,8 @@ static inline void arch_reset(char mode, const char *cmd)
 {
         for (;;) ;  /* depends on IPC w/ other core */
 }
+
+/* low level hardware reset hook -- for example, hitting the
+ * PSHOLD line on the PMIC to hard reset the system
+ */
+extern void (*msm_hw_reset_hook)(void);