rpmsg: Add snapshot of RPMSG drivers for lahaina

This snapshot is taken as of msm-4.19 'commit <d2f41beab007i>
("Merge "msm: npu: Add bandwidth monitor support"")'.

This change brings the rpmsg and rpmsg glink drivers up to date with
the fixes from msm-4.19. In addition, change the copyrights to SPDX format.

Also, irq_set_affinity and sched_setaffinity can not be used when compiling
a driver as a module. Hence, moving to module-friendly APIs.

Change-Id: Id8c0bd13535c91cbecb11445bf798be44083abb6
Signed-off-by: Jay Jayanna <jayanna@codeaurora.org>

drivers/rpmsg/qcom_glink_native.h

@@ -22,6 +22,8 @@ struct qcom_glink_pipe {
 	void (*write)(struct qcom_glink_pipe *glink_pipe,
 		      const void *hdr, size_t hlen,
 		      const void *data, size_t dlen);
+
+	void (*reset)(struct qcom_glink_pipe *glink_pipe);
 };
 
 struct qcom_glink;

drivers/rpmsg/qcom_glink_smem.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2016, 2019 Linaro Ltd
+ * Copyright (c) 2018-2019, The Linux Foundation, All rights reserved.
  */
 
 #include <linux/io.h>
@@ -114,7 +115,7 @@ static void glink_smem_rx_advance(struct qcom_glink_pipe *np,
 	tail = le32_to_cpu(*pipe->tail);
 
 	tail += count;
-	if (tail > pipe->native.length)
+	if (tail >= pipe->native.length)
 		tail %= pipe->native.length;
 
 	*pipe->tail = cpu_to_le32(tail);

drivers/rpmsg/rpmsg_core.c

@@ -4,6 +4,7 @@
  *
  * Copyright (C) 2011 Texas Instruments, Inc.
  * Copyright (C) 2011 Google, Inc.
+ * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
  *
  * Ohad Ben-Cohen <ohad@wizery.com>
  * Brian Swetland <swetland@google.com>
@@ -81,7 +82,7 @@ EXPORT_SYMBOL(rpmsg_create_ept);
  */
 void rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
 {
-	if (ept)
+	if (ept && ept->ops)
 		ept->ops->destroy_ept(ept);
 }
 EXPORT_SYMBOL(rpmsg_destroy_ept);
@@ -283,6 +284,42 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
 }
 EXPORT_SYMBOL(rpmsg_trysend_offchannel);
 
+/**
+ * rpmsg_get_sigs() - get the signals for this endpoint
+ * @ept:	the rpmsg endpoint
+ * @sigs:	serial signals bitmask
+ *
+ * Returns 0 on success and an appropriate error value on failure.
+ */
+int rpmsg_get_sigs(struct rpmsg_endpoint *ept, u32 *lsigs, u32 *rsigs)
+{
+	if (WARN_ON(!ept))
+		return -EINVAL;
+	if (!ept->ops->get_sigs)
+		return -ENXIO;
+
+	return ept->ops->get_sigs(ept, lsigs, rsigs);
+}
+EXPORT_SYMBOL(rpmsg_get_sigs);
+
+/**
+ * rpmsg_set_sigs() - set the remote signals for this endpoint
+ * @ept:	the rpmsg endpoint
+ * @sigs:	serial signals bitmask
+ *
+ * Returns 0 on success and an appropriate error value on failure.
+ */
+int rpmsg_set_sigs(struct rpmsg_endpoint *ept, u32 sigs)
+{
+	if (WARN_ON(!ept))
+		return -EINVAL;
+	if (!ept->ops->set_sigs)
+		return -ENXIO;
+
+	return ept->ops->set_sigs(ept, sigs);
+}
+EXPORT_SYMBOL(rpmsg_set_sigs);
+
 /*
  * match an rpmsg channel with a channel info struct.
  * this is used to make sure we're not creating rpmsg devices for channels
@@ -468,6 +505,10 @@ static int rpmsg_dev_probe(struct device *dev)
 
 		rpdev->ept = ept;
 		rpdev->src = ept->addr;
+
+		if (rpdrv->signals)
+			ept->sig_cb = rpdrv->signals;
+
 	}
 
 	err = rpdrv->probe(rpdev);

drivers/rpmsg/rpmsg_internal.h

@@ -4,6 +4,7 @@
  *
  * Copyright (C) 2011 Texas Instruments, Inc.
  * Copyright (C) 2011 Google, Inc.
+ * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
  *
  * Ohad Ben-Cohen <ohad@wizery.com>
  * Brian Swetland <swetland@google.com>
@@ -46,6 +47,8 @@ struct rpmsg_device_ops {
  * @trysend:		see @rpmsg_trysend(), required
  * @trysendto:		see @rpmsg_trysendto(), optional
  * @trysend_offchannel:	see @rpmsg_trysend_offchannel(), optional
+ * @get_sigs:		see @rpmsg_get_sigs(), optional
+ * @set_sigs:		see @rpmsg_set_sigs(), optional
  *
  * Indirection table for the operations that a rpmsg backend should implement.
  * In addition to @destroy_ept, the backend must at least implement @send and
@@ -65,6 +68,8 @@ struct rpmsg_endpoint_ops {
 			     void *data, int len);
 	__poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp,
 			     poll_table *wait);
+	int (*get_sigs)(struct rpmsg_endpoint *ept, u32 *lsigs, u32 *rsigs);
+	int (*set_sigs)(struct rpmsg_endpoint *ept, u32 sigs);
 };
 
 int rpmsg_register_device(struct rpmsg_device *rpdev);

include/linux/rpmsg.h

@@ -4,6 +4,7 @@
  *
  * Copyright (C) 2011 Texas Instruments, Inc.
  * Copyright (C) 2011 Google, Inc.
+ * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
  * All rights reserved.
  */
 
@@ -60,12 +61,14 @@ struct rpmsg_device {
 };
 
 typedef int (*rpmsg_rx_cb_t)(struct rpmsg_device *, void *, int, void *, u32);
+typedef int (*rpmsg_rx_sig_t)(struct rpmsg_device *, u32, u32);
 
 /**
  * struct rpmsg_endpoint - binds a local rpmsg address to its user
  * @rpdev: rpmsg channel device
  * @refcount: when this drops to zero, the ept is deallocated
  * @cb: rx callback handler
+ * @sig_cb: rx serial signal handler
  * @cb_lock: must be taken before accessing/changing @cb
  * @addr: local rpmsg address
  * @priv: private data for the driver's use
@@ -88,6 +91,7 @@ struct rpmsg_endpoint {
 	struct rpmsg_device *rpdev;
 	struct kref refcount;
 	rpmsg_rx_cb_t cb;
+	rpmsg_rx_sig_t sig_cb;
 	struct mutex cb_lock;
 	u32 addr;
 	void *priv;
@@ -102,6 +106,7 @@ struct rpmsg_endpoint {
  * @probe: invoked when a matching rpmsg channel (i.e. device) is found
  * @remove: invoked when the rpmsg channel is removed
  * @callback: invoked when an inbound message is received on the channel
+ * @signals: invoked when a serial signal change is received on the channel
  */
 struct rpmsg_driver {
 	struct device_driver drv;
@@ -109,6 +114,7 @@ struct rpmsg_driver {
 	int (*probe)(struct rpmsg_device *dev);
 	void (*remove)(struct rpmsg_device *dev);
 	int (*callback)(struct rpmsg_device *, void *, int, void *, u32);
+	int (*signals)(struct rpmsg_device *rpdev, u32 old, u32 new);
 };
 
 #if IS_ENABLED(CONFIG_RPMSG)
@@ -135,6 +141,9 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
 __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
 			poll_table *wait);
 
+int rpmsg_get_sigs(struct rpmsg_endpoint *ept, u32 *lsigs, u32 *rsigs);
+int rpmsg_set_sigs(struct rpmsg_endpoint *ept, u32 sigs);
+
 #else
 
 static inline int register_rpmsg_device(struct rpmsg_device *dev)
@@ -242,6 +251,23 @@ static inline __poll_t rpmsg_poll(struct rpmsg_endpoint *ept,
 	return 0;
 }
 
+static inline int rpmsg_get_sigs(struct rpmsg_endpoint *ept, u32 *lsigs,
+				 u32 *rsigs)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+
+	return -ENXIO;
+}
+
+static inline int rpmsg_set_sigs(struct rpmsg_endpoint *ept, u32 sigs)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+
+	return -ENXIO;
+}
+
 #endif /* IS_ENABLED(CONFIG_RPMSG) */
 
 /* use a macro to avoid include chaining to get THIS_MODULE */

include/linux/rpmsg/qcom_glink.h

@@ -6,6 +6,7 @@
 #include <linux/device.h>
 
 struct qcom_glink;
+struct glink_spi;
 
 #if IS_ENABLED(CONFIG_RPMSG_QCOM_GLINK_SMEM)
 
@@ -26,4 +27,44 @@ static inline void qcom_glink_smem_unregister(struct qcom_glink *glink) {}
 
 #endif
 
+
+#if IS_ENABLED(CONFIG_RPMSG_QCOM_GLINK_SPSS)
+
+struct qcom_glink *qcom_glink_spss_register(struct device *parent,
+					    struct device_node *node);
+void qcom_glink_spss_unregister(struct qcom_glink *glink);
+
+#else
+
+static inline struct qcom_glink *
+qcom_glink_spss_register(struct device *parent,
+			 struct device_node *node)
+{
+	return NULL;
+}
+
+static inline void qcom_glink_spss_unregister(struct qcom_glink *glink) {}
+
+#endif
+
+
+#if IS_ENABLED(CONFIG_RPMSG_QCOM_GLINK_SPI)
+
+struct glink_spi *qcom_glink_spi_register(struct device *parent,
+					       struct device_node *node);
+void qcom_glink_spi_unregister(struct glink_spi *glink);
+
+#else
+
+static inline struct glink_spi *
+qcom_glink_spi_register(struct device *parent, struct device_node *node)
+{
+	return NULL;
+}
+
+static inline void qcom_glink_spi_unregister(struct glink_spi *glink) {}
+
+#endif
+
+
 #endif