soc: qcom: Add Shared Memory Driver

This adds the Qualcomm Shared Memory Driver (SMD) providing
communication channels to remote processors, ontop of SMEM.

Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Andy Gross <agross@codeaurora.org>

1 files changed, 46 insertions, 0 deletions

diff --git a/include/linux/soc/qcom/smd.h b/include/linux/soc/qcom/smd.h
new file mode 100644
index 000000000000..d7e50aa6a4ac
--- /dev/null
+++ b/include/linux/soc/qcom/smd.h
@@ -0,0 +1,46 @@
+#ifndef __QCOM_SMD_H__
+#define __QCOM_SMD_H__
+
+#include <linux/device.h>
+#include <linux/mod_devicetable.h>
+
+struct qcom_smd;
+struct qcom_smd_channel;
+struct qcom_smd_lookup;
+
+/**
+ * struct qcom_smd_device - smd device struct
+ * @dev:        the device struct
+ * @channel:    handle to the smd channel for this device
+ */
+struct qcom_smd_device {
+        struct device dev;
+        struct qcom_smd_channel *channel;
+};
+
+/**
+ * struct qcom_smd_driver - smd driver struct
+ * @driver:     underlying device driver
+ * @probe:      invoked when the smd channel is found
+ * @remove:     invoked when the smd channel is closed
+ * @callback:   invoked when an inbound message is received on the channel,
+ *              should return 0 on success or -EBUSY if the data cannot be
+ *              consumed at this time
+ */
+struct qcom_smd_driver {
+        struct device_driver driver;
+        int (*probe)(struct qcom_smd_device *dev);
+        void (*remove)(struct qcom_smd_device *dev);
+        int (*callback)(struct qcom_smd_device *, const void *, size_t);
+};
+
+int qcom_smd_driver_register(struct qcom_smd_driver *drv);
+void qcom_smd_driver_unregister(struct qcom_smd_driver *drv);
+
+#define module_qcom_smd_driver(__smd_driver) \
+        module_driver(__smd_driver, qcom_smd_driver_register, \
+                      qcom_smd_driver_unregister)
+
+int qcom_smd_send(struct qcom_smd_channel *channel, const void *data, int len);
+
+#endif