[PATCH v2 5/5] soc: qcom: smp2p: Qualcomm Shared Memory Point to Point

2015-09-24 Thread Bjorn Andersson 
Introduce the Qualcomm Shard Memory Point to Point driver.

Signed-off-by: Bjorn Andersson 
---

Changes since v1:
- Use the newly created smem state helper instead of gpiolib

 drivers/soc/qcom/Kconfig  |   8 +
 drivers/soc/qcom/Makefile |   1 +
 drivers/soc/qcom/smp2p.c  | 578 ++
 3 files changed, 587 insertions(+)
 create mode 100644 drivers/soc/qcom/smp2p.c

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index 015baf47874c..7fc0d08c6f14 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -52,6 +52,14 @@ config QCOM_SMD_RPM
 config QCOM_SMEM_STATE
bool
 
+config QCOM_SMP2P
+   bool "Qualcomm Shared Memory Point to Point support"
+   depends on QCOM_SMEM
+   select QCOM_SMEM_STATE
+   help
+ Say yes here to support the Qualcomm Shared Memory Point to Point
+ protocol.
+
 config QCOM_SMSM
bool "Qualcomm Shared Memory State Machine"
depends on QCOM_SMEM
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index 452c505dafe4..69886e0f7ef8 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -4,4 +4,5 @@ obj-$(CONFIG_QCOM_SMD) +=   smd.o
 obj-$(CONFIG_QCOM_SMD_RPM) += smd-rpm.o
 obj-$(CONFIG_QCOM_SMEM) += smem.o
 obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
+obj-$(CONFIG_QCOM_SMP2P)   += smp2p.o
 obj-$(CONFIG_QCOM_SMSM)+= smsm.o
diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
new file mode 100644
index ..f1eed7f9dd67
--- /dev/null
+++ b/drivers/soc/qcom/smp2p.c
@@ -0,0 +1,578 @@
+/*
+ * Copyright (c) 2015, Sony Mobile Communications AB.
+ * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+
+/*
+ * The Shared Memory Point to Point (SMP2P) protocol facilitates communication
+ * of a single 32-bit value between two processors.  Each value has a single
+ * writer (the local side) and a single reader (the remote side). Values are
+ * uniquely identified in the system by the directed edge (local processor ID
+ * to remote processor ID) and a string identifier.
+ *
+ * Each processor is responsible for creating the outgoing SMEM items and each
+ * item is writable by the local processor and readable by the remote
+ * processor.  By using two separate SMEM items that are single-reader and
+ * single-writer, SMP2P does not require any remote locking mechanisms.
+ *
+ * The driver uses the Linux GPIO and interrupt framework to expose a virtual
+ * GPIO for each outbound entry and a virtual interrupt controller for each
+ * inbound entry.
+ */
+
+#define SMP2P_MAX_ENTRY 16
+#define SMP2P_MAX_ENTRY_NAME 16
+
+#define SMP2P_FEATURE_SSR_ACK 0x1
+
+#define SMP2P_MAGIC 0x504d5324
+
+/**
+ * struct smp2p_smem_item - in memory communication structure
+ * @magic: magic number
+ * @version:   version - must be 1
+ * @features:  features flag - currently unused
+ * @local_pid: processor id of sending end
+ * @remote_pid:processor id of receiving end
+ * @total_entries: number of entries - always SMP2P_MAX_ENTRY
+ * @valid_entries: number of allocated entries
+ * @flags:
+ * @entries:   individual communication entries
+ * @name:  name of the entry
+ * @value: content of the entry
+ */
+struct smp2p_smem_item {
+   u32 magic;
+   u8 version;
+   unsigned features:24;
+   u16 local_pid;
+   u16 remote_pid;
+   u16 total_entries;
+   u16 valid_entries;
+   u32 flags;
+
+   struct {
+   u8 name[SMP2P_MAX_ENTRY_NAME];
+   u32 value;
+   } entries[SMP2P_MAX_ENTRY];
+} __packed;
+
+/**
+ * struct smp2p_entry - driver context matching one entry
+ * @node:  list entry to keep track of allocated entries
+ * @smp2p: reference to the device driver context
+ * @name:  name of the entry, to match against smp2p_smem_item
+ * @value: pointer to smp2p_smem_item entry value
+ * @last_value:last handled value
+ * @domain:irq_domain for inbound entries
+ * @irq_enabled:bitmap to track enabled irq bits
+ * @irq_rising:bitmap to mark irq bits for rising detection
+ * @irq_falling:bitmap to mark irq bits for falling detection
+ * @state: smem state handle
+ * @lock:  spinlock to protect read-modify-write of

[PATCH v2 5/5] soc: qcom: smp2p: Qualcomm Shared Memory Point to Point

2015-09-24 Thread Bjorn Andersson 
Introduce the Qualcomm Shard Memory Point to Point driver.

Signed-off-by: Bjorn Andersson 
---

Changes since v1:
- Use the newly created smem state helper instead of gpiolib

 drivers/soc/qcom/Kconfig  |   8 +
 drivers/soc/qcom/Makefile |   1 +
 drivers/soc/qcom/smp2p.c  | 578 ++
 3 files changed, 587 insertions(+)
 create mode 100644 drivers/soc/qcom/smp2p.c

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index 015baf47874c..7fc0d08c6f14 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -52,6 +52,14 @@ config QCOM_SMD_RPM
 config QCOM_SMEM_STATE
bool
 
+config QCOM_SMP2P
+   bool "Qualcomm Shared Memory Point to Point support"
+   depends on QCOM_SMEM
+   select QCOM_SMEM_STATE
+   help
+ Say yes here to support the Qualcomm Shared Memory Point to Point
+ protocol.
+
 config QCOM_SMSM
bool "Qualcomm Shared Memory State Machine"
depends on QCOM_SMEM
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index 452c505dafe4..69886e0f7ef8 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -4,4 +4,5 @@ obj-$(CONFIG_QCOM_SMD) +=   smd.o
 obj-$(CONFIG_QCOM_SMD_RPM) += smd-rpm.o
 obj-$(CONFIG_QCOM_SMEM) += smem.o
 obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
+obj-$(CONFIG_QCOM_SMP2P)   += smp2p.o
 obj-$(CONFIG_QCOM_SMSM)+= smsm.o
diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
new file mode 100644
index ..f1eed7f9dd67
--- /dev/null
+++ b/drivers/soc/qcom/smp2p.c
@@ -0,0 +1,578 @@
+/*
+ * Copyright (c) 2015, Sony Mobile Communications AB.
+ * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+
+/*
+ * The Shared Memory Point to Point (SMP2P) protocol facilitates communication
+ * of a single 32-bit value between two processors.  Each value has a single
+ * writer (the local side) and a single reader (the remote side). Values are
+ * uniquely identified in the system by the directed edge (local processor ID
+ * to remote processor ID) and a string identifier.
+ *
+ * Each processor is responsible for creating the outgoing SMEM items and each
+ * item is writable by the local processor and readable by the remote
+ * processor.  By using two separate SMEM items that are single-reader and
+ * single-writer, SMP2P does not require any remote locking mechanisms.
+ *
+ * The driver uses the Linux GPIO and interrupt framework to expose a virtual
+ * GPIO for each outbound entry and a virtual interrupt controller for each
+ * inbound entry.
+ */
+
+#define SMP2P_MAX_ENTRY 16
+#define SMP2P_MAX_ENTRY_NAME 16
+
+#define SMP2P_FEATURE_SSR_ACK 0x1
+
+#define SMP2P_MAGIC 0x504d5324
+
+/**
+ * struct smp2p_smem_item - in memory communication structure
+ * @magic: magic number
+ * @version:   version - must be 1
+ * @features:  features flag - currently unused
+ * @local_pid: processor id of sending end
+ * @remote_pid:processor id of receiving end
+ * @total_entries: number of entries - always SMP2P_MAX_ENTRY
+ * @valid_entries: number of allocated entries
+ * @flags:
+ * @entries:   individual communication entries
+ * @name:  name of the entry
+ * @value: content of the entry
+ */
+struct smp2p_smem_item {
+   u32 magic;
+   u8 version;
+   unsigned features:24;
+   u16 local_pid;
+   u16 remote_pid;
+   u16 total_entries;
+   u16 valid_entries;
+   u32 flags;
+
+   struct {
+   u8 name[SMP2P_MAX_ENTRY_NAME];
+   u32 value;
+   } entries[SMP2P_MAX_ENTRY];
+} __packed;
+
+/**
+ * struct smp2p_entry - driver context matching one entry
+ * @node:  list entry to keep track of allocated entries
+ * @smp2p: reference to the device driver context
+ * @name:  name of the entry, to match against smp2p_smem_item
+ * @value: pointer to smp2p_smem_item entry value
+ * @last_value:last handled value
+ * @domain:irq_domain for inbound entries
+ * @irq_enabled:bitmap to track enabled irq bits
+ * @irq_rising:bitmap to mark irq bits for rising detection
+ * @irq_falling:bitmap to mark irq bits for falling detection
+ * @state: smem state handle
+ * @lock:  spinlock