in /dev. They make it possible for user-space programs to send and
receive rpmsg packets.
+config RPMSG_QCOM_GLINK_NATIVE
+ tristate
+ select RPMSG
+
config RPMSG_QCOM_GLINK_RPM
tristate "Qualcomm RPM Glink driver"
- select RPMSG
+ select RPMSG_QCOM_GLINK_NATIVE
depends on HAS_IOMEM
depends on MAILBOX
help
obj-$(CONFIG_RPMSG) += rpmsg_core.o
obj-$(CONFIG_RPMSG_CHAR) += rpmsg_char.o
obj-$(CONFIG_RPMSG_QCOM_GLINK_RPM) += qcom_glink_rpm.o
+obj-$(CONFIG_RPMSG_QCOM_GLINK_NATIVE) += qcom_glink_native.o
obj-$(CONFIG_RPMSG_QCOM_SMD) += qcom_smd.o
obj-$(CONFIG_RPMSG_VIRTIO) += virtio_rpmsg_bus.o
--- /dev/null
+/*
+ * Copyright (c) 2016-2017, Linaro Ltd
+ *
+ * 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 <linux/idr.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/list.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/rpmsg.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/mailbox_client.h>
+
+#include "rpmsg_internal.h"
+#include "qcom_glink_native.h"
+
+#define GLINK_NAME_SIZE 32
+
+#define RPM_GLINK_CID_MIN 1
+#define RPM_GLINK_CID_MAX 65536
+
+struct glink_msg {
+ __le16 cmd;
+ __le16 param1;
+ __le32 param2;
+ u8 data[];
+} __packed;
+
+/**
+ * struct glink_defer_cmd - deferred incoming control message
+ * @node: list node
+ * @msg: message header
+ * data: payload of the message
+ *
+ * Copy of a received control message, to be added to @rx_queue and processed
+ * by @rx_work of @qcom_glink.
+ */
+struct glink_defer_cmd {
+ struct list_head node;
+
+ struct glink_msg msg;
+ u8 data[];
+};
+
+/**
+ * struct qcom_glink - driver context, relates to one remote subsystem
+ * @dev: reference to the associated struct device
+ * @mbox_client: mailbox client
+ * @mbox_chan: mailbox channel
+ * @rx_pipe: pipe object for receive FIFO
+ * @tx_pipe: pipe object for transmit FIFO
+ * @irq: IRQ for signaling incoming events
+ * @rx_work: worker for handling received control messages
+ * @rx_lock: protects the @rx_queue
+ * @rx_queue: queue of received control messages to be processed in @rx_work
+ * @tx_lock: synchronizes operations on the tx fifo
+ * @idr_lock: synchronizes @lcids and @rcids modifications
+ * @lcids: idr of all channels with a known local channel id
+ * @rcids: idr of all channels with a known remote channel id
+ */
+struct qcom_glink {
+ struct device *dev;
+
+ struct mbox_client mbox_client;
+ struct mbox_chan *mbox_chan;
+
+ struct qcom_glink_pipe *rx_pipe;
+ struct qcom_glink_pipe *tx_pipe;
+
+ int irq;
+
+ struct work_struct rx_work;
+ spinlock_t rx_lock;
+ struct list_head rx_queue;
+
+ struct mutex tx_lock;
+
+ struct mutex idr_lock;
+ struct idr lcids;
+ struct idr rcids;
+};
+
+enum {
+ GLINK_STATE_CLOSED,
+ GLINK_STATE_OPENING,
+ GLINK_STATE_OPEN,
+ GLINK_STATE_CLOSING,
+};
+
+/**
+ * struct glink_channel - internal representation of a channel
+ * @rpdev: rpdev reference, only used for primary endpoints
+ * @ept: rpmsg endpoint this channel is associated with
+ * @glink: qcom_glink context handle
+ * @refcount: refcount for the channel object
+ * @recv_lock: guard for @ept.cb
+ * @name: unique channel name/identifier
+ * @lcid: channel id, in local space
+ * @rcid: channel id, in remote space
+ * @buf: receive buffer, for gathering fragments
+ * @buf_offset: write offset in @buf
+ * @buf_size: size of current @buf
+ * @open_ack: completed once remote has acked the open-request
+ * @open_req: completed once open-request has been received
+ */
+struct glink_channel {
+ struct rpmsg_endpoint ept;
+
+ struct rpmsg_device *rpdev;
+ struct qcom_glink *glink;
+
+ struct kref refcount;
+
+ spinlock_t recv_lock;
+
+ char *name;
+ unsigned int lcid;
+ unsigned int rcid;
+
+ void *buf;
+ int buf_offset;
+ int buf_size;
+
+ struct completion open_ack;
+ struct completion open_req;
+};
+
+#define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept)
+
+static const struct rpmsg_endpoint_ops glink_endpoint_ops;
+
+#define RPM_CMD_VERSION 0
+#define RPM_CMD_VERSION_ACK 1
+#define RPM_CMD_OPEN 2
+#define RPM_CMD_CLOSE 3
+#define RPM_CMD_OPEN_ACK 4
+#define RPM_CMD_TX_DATA 9
+#define RPM_CMD_CLOSE_ACK 11
+#define RPM_CMD_TX_DATA_CONT 12
+#define RPM_CMD_READ_NOTIF 13
+
+#define GLINK_FEATURE_INTENTLESS BIT(1)
+
+static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink,
+ const char *name)
+{
+ struct glink_channel *channel;
+
+ channel = kzalloc(sizeof(*channel), GFP_KERNEL);
+ if (!channel)
+ return ERR_PTR(-ENOMEM);
+
+ /* Setup glink internal glink_channel data */
+ spin_lock_init(&channel->recv_lock);
+ channel->glink = glink;
+ channel->name = kstrdup(name, GFP_KERNEL);
+
+ init_completion(&channel->open_req);
+ init_completion(&channel->open_ack);
+
+ kref_init(&channel->refcount);
+
+ return channel;
+}
+
+static void qcom_glink_channel_release(struct kref *ref)
+{
+ struct glink_channel *channel = container_of(ref, struct glink_channel,
+ refcount);
+
+ kfree(channel->name);
+ kfree(channel);
+}
+
+static size_t qcom_glink_rx_avail(struct qcom_glink *glink)
+{
+ return glink->rx_pipe->avail(glink->rx_pipe);
+}
+
+static void qcom_glink_rx_peak(struct qcom_glink *glink,
+ void *data, size_t count)
+{
+ glink->rx_pipe->peak(glink->rx_pipe, data, count);
+}
+
+static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count)
+{
+ glink->rx_pipe->advance(glink->rx_pipe, count);
+}
+
+static size_t qcom_glink_tx_avail(struct qcom_glink *glink)
+{
+ return glink->tx_pipe->avail(glink->tx_pipe);
+}
+
+static void qcom_glink_tx_write(struct qcom_glink *glink,
+ const void *hdr, size_t hlen,
+ const void *data, size_t dlen)
+{
+ glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen);
+}
+
+static int qcom_glink_tx(struct qcom_glink *glink,
+ const void *hdr, size_t hlen,
+ const void *data, size_t dlen, bool wait)
+{
+ unsigned int tlen = hlen + dlen;
+ int ret;
+
+ /* Reject packets that are too big */
+ if (tlen >= glink->tx_pipe->length)
+ return -EINVAL;
+
+ if (WARN(tlen % 8, "Unaligned TX request"))
+ return -EINVAL;
+
+ ret = mutex_lock_interruptible(&glink->tx_lock);
+ if (ret)
+ return ret;
+
+ while (qcom_glink_tx_avail(glink) < tlen) {
+ if (!wait) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ usleep_range(10000, 15000);
+ }
+
+ qcom_glink_tx_write(glink, hdr, hlen, data, dlen);
+
+ mbox_send_message(glink->mbox_chan, NULL);
+ mbox_client_txdone(glink->mbox_chan, 0);
+
+out:
+ mutex_unlock(&glink->tx_lock);
+
+ return ret;
+}
+
+static int qcom_glink_send_version(struct qcom_glink *glink)
+{
+ struct glink_msg msg;
+
+ msg.cmd = cpu_to_le16(RPM_CMD_VERSION);
+ msg.param1 = cpu_to_le16(1);
+ msg.param2 = cpu_to_le32(GLINK_FEATURE_INTENTLESS);
+
+ return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
+}
+
+static void qcom_glink_send_version_ack(struct qcom_glink *glink)
+{
+ struct glink_msg msg;
+
+ msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK);
+ msg.param1 = cpu_to_le16(1);
+ msg.param2 = cpu_to_le32(0);
+
+ qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
+}
+
+static void qcom_glink_send_open_ack(struct qcom_glink *glink,
+ struct glink_channel *channel)
+{
+ struct glink_msg msg;
+
+ msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK);
+ msg.param1 = cpu_to_le16(channel->rcid);
+ msg.param2 = cpu_to_le32(0);
+
+ qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
+}
+
+/**
+ * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote
+ * @glink: Ptr to the glink edge
+ * @channel: Ptr to the channel that the open req is sent
+ *
+ * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote.
+ * Will return with refcount held, regardless of outcome.
+ *
+ * Returns 0 on success, negative errno otherwise.
+ */
+static int qcom_glink_send_open_req(struct qcom_glink *glink,
+ struct glink_channel *channel)
+{
+ struct {
+ struct glink_msg msg;
+ u8 name[GLINK_NAME_SIZE];
+ } __packed req;
+ int name_len = strlen(channel->name) + 1;
+ int req_len = ALIGN(sizeof(req.msg) + name_len, 8);
+ int ret;
+
+ kref_get(&channel->refcount);
+
+ mutex_lock(&glink->idr_lock);
+ ret = idr_alloc_cyclic(&glink->lcids, channel,
+ RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX,
+ GFP_KERNEL);
+ mutex_unlock(&glink->idr_lock);
+ if (ret < 0)
+ return ret;
+
+ channel->lcid = ret;
+
+ req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN);
+ req.msg.param1 = cpu_to_le16(channel->lcid);
+ req.msg.param2 = cpu_to_le32(name_len);
+ strcpy(req.name, channel->name);
+
+ ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true);
+ if (ret)
+ goto remove_idr;
+
+ return 0;
+
+remove_idr:
+ mutex_lock(&glink->idr_lock);
+ idr_remove(&glink->lcids, channel->lcid);
+ channel->lcid = 0;
+ mutex_unlock(&glink->idr_lock);
+
+ return ret;
+}
+
+static void qcom_glink_send_close_req(struct qcom_glink *glink,
+ struct glink_channel *channel)
+{
+ struct glink_msg req;
+
+ req.cmd = cpu_to_le16(RPM_CMD_CLOSE);
+ req.param1 = cpu_to_le16(channel->lcid);
+ req.param2 = 0;
+
+ qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
+}
+
+static void qcom_glink_send_close_ack(struct qcom_glink *glink,
+ unsigned int rcid)
+{
+ struct glink_msg req;
+
+ req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK);
+ req.param1 = cpu_to_le16(rcid);
+ req.param2 = 0;
+
+ qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
+}
+
+static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra)
+{
+ struct glink_defer_cmd *dcmd;
+
+ extra = ALIGN(extra, 8);
+
+ if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) {
+ dev_dbg(glink->dev, "Insufficient data in rx fifo");
+ return -ENXIO;
+ }
+
+ dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC);
+ if (!dcmd)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&dcmd->node);
+
+ qcom_glink_rx_peak(glink, &dcmd->msg, sizeof(dcmd->msg) + extra);
+
+ spin_lock(&glink->rx_lock);
+ list_add_tail(&dcmd->node, &glink->rx_queue);
+ spin_unlock(&glink->rx_lock);
+
+ schedule_work(&glink->rx_work);
+ qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra);
+
+ return 0;
+}
+
+static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail)
+{
+ struct glink_channel *channel;
+ struct {
+ struct glink_msg msg;
+ __le32 chunk_size;
+ __le32 left_size;
+ } __packed hdr;
+ unsigned int chunk_size;
+ unsigned int left_size;
+ unsigned int rcid;
+
+ if (avail < sizeof(hdr)) {
+ dev_dbg(glink->dev, "Not enough data in fifo\n");
+ return -EAGAIN;
+ }
+
+ qcom_glink_rx_peak(glink, &hdr, sizeof(hdr));
+ chunk_size = le32_to_cpu(hdr.chunk_size);
+ left_size = le32_to_cpu(hdr.left_size);
+
+ if (avail < sizeof(hdr) + chunk_size) {
+ dev_dbg(glink->dev, "Payload not yet in fifo\n");
+ return -EAGAIN;
+ }
+
+ if (WARN(chunk_size % 4, "Incoming data must be word aligned\n"))
+ return -EINVAL;
+
+ rcid = le16_to_cpu(hdr.msg.param1);
+ channel = idr_find(&glink->rcids, rcid);
+ if (!channel) {
+ dev_dbg(glink->dev, "Data on non-existing channel\n");
+
+ /* Drop the message */
+ qcom_glink_rx_advance(glink,
+ ALIGN(sizeof(hdr) + chunk_size, 8));
+ return 0;
+ }
+
+ /* Might have an ongoing, fragmented, message to append */
+ if (!channel->buf) {
+ channel->buf = kmalloc(chunk_size + left_size, GFP_ATOMIC);
+ if (!channel->buf)
+ return -ENOMEM;
+
+ channel->buf_size = chunk_size + left_size;
+ channel->buf_offset = 0;
+ }
+
+ qcom_glink_rx_advance(glink, sizeof(hdr));
+
+ if (channel->buf_size - channel->buf_offset < chunk_size) {
+ dev_err(glink->dev, "Insufficient space in input buffer\n");
+
+ /* The packet header lied, drop payload */
+ qcom_glink_rx_advance(glink, chunk_size);
+ return -ENOMEM;
+ }
+
+ qcom_glink_rx_peak(glink, channel->buf + channel->buf_offset,
+ chunk_size);
+ channel->buf_offset += chunk_size;
+
+ /* Handle message when no fragments remain to be received */
+ if (!left_size) {
+ spin_lock(&channel->recv_lock);
+ if (channel->ept.cb) {
+ channel->ept.cb(channel->ept.rpdev,
+ channel->buf,
+ channel->buf_offset,
+ channel->ept.priv,
+ RPMSG_ADDR_ANY);
+ }
+ spin_unlock(&channel->recv_lock);
+
+ kfree(channel->buf);
+ channel->buf = NULL;
+ channel->buf_size = 0;
+ }
+
+ /* Each message starts at 8 byte aligned address */
+ qcom_glink_rx_advance(glink, ALIGN(chunk_size, 8));
+
+ return 0;
+}
+
+static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid)
+{
+ struct glink_channel *channel;
+
+ channel = idr_find(&glink->lcids, lcid);
+ if (!channel) {
+ dev_err(glink->dev, "Invalid open ack packet\n");
+ return -EINVAL;
+ }
+
+ complete(&channel->open_ack);
+
+ return 0;
+}
+
+static irqreturn_t qcom_glink_native_intr(int irq, void *data)
+{
+ struct qcom_glink *glink = data;
+ struct glink_msg msg;
+ unsigned int param1;
+ unsigned int param2;
+ unsigned int avail;
+ unsigned int cmd;
+ int ret;
+
+ for (;;) {
+ avail = qcom_glink_rx_avail(glink);
+ if (avail < sizeof(msg))
+ break;
+
+ qcom_glink_rx_peak(glink, &msg, sizeof(msg));
+
+ cmd = le16_to_cpu(msg.cmd);
+ param1 = le16_to_cpu(msg.param1);
+ param2 = le32_to_cpu(msg.param2);
+
+ switch (cmd) {
+ case RPM_CMD_VERSION:
+ case RPM_CMD_VERSION_ACK:
+ case RPM_CMD_CLOSE:
+ case RPM_CMD_CLOSE_ACK:
+ ret = qcom_glink_rx_defer(glink, 0);
+ break;
+ case RPM_CMD_OPEN_ACK:
+ ret = qcom_glink_rx_open_ack(glink, param1);
+ qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
+ break;
+ case RPM_CMD_OPEN:
+ ret = qcom_glink_rx_defer(glink, param2);
+ break;
+ case RPM_CMD_TX_DATA:
+ case RPM_CMD_TX_DATA_CONT:
+ ret = qcom_glink_rx_data(glink, avail);
+ break;
+ case RPM_CMD_READ_NOTIF:
+ qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
+
+ mbox_send_message(glink->mbox_chan, NULL);
+ mbox_client_txdone(glink->mbox_chan, 0);
+
+ ret = 0;
+ break;
+ default:
+ dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd);
+ ret = -EINVAL;
+ break;
+ }
+
+ if (ret)
+ break;
+ }
+
+ return IRQ_HANDLED;
+}
+
+/* Locally initiated rpmsg_create_ept */
+static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink,
+ const char *name)
+{
+ struct glink_channel *channel;
+ int ret;
+
+ channel = qcom_glink_alloc_channel(glink, name);
+ if (IS_ERR(channel))
+ return ERR_CAST(channel);
+
+ ret = qcom_glink_send_open_req(glink, channel);
+ if (ret)
+ goto release_channel;
+
+ ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
+ if (!ret)
+ goto err_timeout;
+
+ ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ);
+ if (!ret)
+ goto err_timeout;
+
+ qcom_glink_send_open_ack(glink, channel);
+
+ return channel;
+
+err_timeout:
+ /* qcom_glink_send_open_req() did register the channel in lcids*/
+ mutex_lock(&glink->idr_lock);
+ idr_remove(&glink->lcids, channel->lcid);
+ mutex_unlock(&glink->idr_lock);
+
+release_channel:
+ /* Release qcom_glink_send_open_req() reference */
+ kref_put(&channel->refcount, qcom_glink_channel_release);
+ /* Release qcom_glink_alloc_channel() reference */
+ kref_put(&channel->refcount, qcom_glink_channel_release);
+
+ return ERR_PTR(-ETIMEDOUT);
+}
+
+/* Remote initiated rpmsg_create_ept */
+static int qcom_glink_create_remote(struct qcom_glink *glink,
+ struct glink_channel *channel)
+{
+ int ret;
+
+ qcom_glink_send_open_ack(glink, channel);
+
+ ret = qcom_glink_send_open_req(glink, channel);
+ if (ret)
+ goto close_link;
+
+ ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
+ if (!ret) {
+ ret = -ETIMEDOUT;
+ goto close_link;
+ }
+
+ return 0;
+
+close_link:
+ /*
+ * Send a close request to "undo" our open-ack. The close-ack will
+ * release the last reference.
+ */
+ qcom_glink_send_close_req(glink, channel);
+
+ /* Release qcom_glink_send_open_req() reference */
+ kref_put(&channel->refcount, qcom_glink_channel_release);
+
+ return ret;
+}
+
+static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev,
+ rpmsg_rx_cb_t cb,
+ void *priv,
+ struct rpmsg_channel_info
+ chinfo)
+{
+ struct glink_channel *parent = to_glink_channel(rpdev->ept);
+ struct glink_channel *channel;
+ struct qcom_glink *glink = parent->glink;
+ struct rpmsg_endpoint *ept;
+ const char *name = chinfo.name;
+ int cid;
+ int ret;
+
+ idr_for_each_entry(&glink->rcids, channel, cid) {
+ if (!strcmp(channel->name, name))
+ break;
+ }
+
+ if (!channel) {
+ channel = qcom_glink_create_local(glink, name);
+ if (IS_ERR(channel))
+ return NULL;
+ } else {
+ ret = qcom_glink_create_remote(glink, channel);
+ if (ret)
+ return NULL;
+ }
+
+ ept = &channel->ept;
+ ept->rpdev = rpdev;
+ ept->cb = cb;
+ ept->priv = priv;
+ ept->ops = &glink_endpoint_ops;
+
+ return ept;
+}
+
+static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept)
+{
+ struct glink_channel *channel = to_glink_channel(ept);
+ struct qcom_glink *glink = channel->glink;
+ unsigned long flags;
+
+ spin_lock_irqsave(&channel->recv_lock, flags);
+ channel->ept.cb = NULL;
+ spin_unlock_irqrestore(&channel->recv_lock, flags);
+
+ /* Decouple the potential rpdev from the channel */
+ channel->rpdev = NULL;
+
+ qcom_glink_send_close_req(glink, channel);
+}
+
+static int __qcom_glink_send(struct glink_channel *channel,
+ void *data, int len, bool wait)
+{
+ struct qcom_glink *glink = channel->glink;
+ struct {
+ struct glink_msg msg;
+ __le32 chunk_size;
+ __le32 left_size;
+ } __packed req;
+
+ if (WARN(len % 8, "RPM GLINK expects 8 byte aligned messages\n"))
+ return -EINVAL;
+
+ req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA);
+ req.msg.param1 = cpu_to_le16(channel->lcid);
+ req.msg.param2 = cpu_to_le32(channel->rcid);
+ req.chunk_size = cpu_to_le32(len);
+ req.left_size = cpu_to_le32(0);
+
+ return qcom_glink_tx(glink, &req, sizeof(req), data, len, wait);
+}
+
+static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len)
+{
+ struct glink_channel *channel = to_glink_channel(ept);
+
+ return __qcom_glink_send(channel, data, len, true);
+}
+
+static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+{
+ struct glink_channel *channel = to_glink_channel(ept);
+
+ return __qcom_glink_send(channel, data, len, false);
+}
+
+/*
+ * Finds the device_node for the glink child interested in this channel.
+ */
+static struct device_node *qcom_glink_match_channel(struct device_node *node,
+ const char *channel)
+{
+ struct device_node *child;
+ const char *name;
+ const char *key;
+ int ret;
+
+ for_each_available_child_of_node(node, child) {
+ key = "qcom,glink-channels";
+ ret = of_property_read_string(child, key, &name);
+ if (ret)
+ continue;
+
+ if (strcmp(name, channel) == 0)
+ return child;
+ }
+
+ return NULL;
+}
+
+static const struct rpmsg_device_ops glink_device_ops = {
+ .create_ept = qcom_glink_create_ept,
+};
+
+static const struct rpmsg_endpoint_ops glink_endpoint_ops = {
+ .destroy_ept = qcom_glink_destroy_ept,
+ .send = qcom_glink_send,
+ .trysend = qcom_glink_trysend,
+};
+
+static void qcom_glink_rpdev_release(struct device *dev)
+{
+ struct rpmsg_device *rpdev = to_rpmsg_device(dev);
+ struct glink_channel *channel = to_glink_channel(rpdev->ept);
+
+ channel->rpdev = NULL;
+ kfree(rpdev);
+}
+
+static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid,
+ char *name)
+{
+ struct glink_channel *channel;
+ struct rpmsg_device *rpdev;
+ bool create_device = false;
+ struct device_node *node;
+ int lcid;
+ int ret;
+
+ idr_for_each_entry(&glink->lcids, channel, lcid) {
+ if (!strcmp(channel->name, name))
+ break;
+ }
+
+ if (!channel) {
+ channel = qcom_glink_alloc_channel(glink, name);
+ if (IS_ERR(channel))
+ return PTR_ERR(channel);
+
+ /* The opening dance was initiated by the remote */
+ create_device = true;
+ }
+
+ mutex_lock(&glink->idr_lock);
+ ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_KERNEL);
+ if (ret < 0) {
+ dev_err(glink->dev, "Unable to insert channel into rcid list\n");
+ mutex_unlock(&glink->idr_lock);
+ goto free_channel;
+ }
+ channel->rcid = ret;
+ mutex_unlock(&glink->idr_lock);
+
+ complete(&channel->open_req);
+
+ if (create_device) {
+ rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
+ if (!rpdev) {
+ ret = -ENOMEM;
+ goto rcid_remove;
+ }
+
+ rpdev->ept = &channel->ept;
+ strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE);
+ rpdev->src = RPMSG_ADDR_ANY;
+ rpdev->dst = RPMSG_ADDR_ANY;
+ rpdev->ops = &glink_device_ops;
+
+ node = qcom_glink_match_channel(glink->dev->of_node, name);
+ rpdev->dev.of_node = node;
+ rpdev->dev.parent = glink->dev;
+ rpdev->dev.release = qcom_glink_rpdev_release;
+
+ ret = rpmsg_register_device(rpdev);
+ if (ret)
+ goto free_rpdev;
+
+ channel->rpdev = rpdev;
+ }
+
+ return 0;
+
+free_rpdev:
+ kfree(rpdev);
+rcid_remove:
+ mutex_lock(&glink->idr_lock);
+ idr_remove(&glink->rcids, channel->rcid);
+ channel->rcid = 0;
+ mutex_unlock(&glink->idr_lock);
+free_channel:
+ /* Release the reference, iff we took it */
+ if (create_device)
+ kref_put(&channel->refcount, qcom_glink_channel_release);
+
+ return ret;
+}
+
+static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid)
+{
+ struct rpmsg_channel_info chinfo;
+ struct glink_channel *channel;
+
+ channel = idr_find(&glink->rcids, rcid);
+ if (WARN(!channel, "close request on unknown channel\n"))
+ return;
+
+ if (channel->rpdev) {
+ strncpy(chinfo.name, channel->name, sizeof(chinfo.name));
+ chinfo.src = RPMSG_ADDR_ANY;
+ chinfo.dst = RPMSG_ADDR_ANY;
+
+ rpmsg_unregister_device(glink->dev, &chinfo);
+ }
+
+ qcom_glink_send_close_ack(glink, channel->rcid);
+
+ mutex_lock(&glink->idr_lock);
+ idr_remove(&glink->rcids, channel->rcid);
+ channel->rcid = 0;
+ mutex_unlock(&glink->idr_lock);
+
+ kref_put(&channel->refcount, qcom_glink_channel_release);
+}
+
+static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid)
+{
+ struct glink_channel *channel;
+
+ channel = idr_find(&glink->lcids, lcid);
+ if (WARN(!channel, "close ack on unknown channel\n"))
+ return;
+
+ mutex_lock(&glink->idr_lock);
+ idr_remove(&glink->lcids, channel->lcid);
+ channel->lcid = 0;
+ mutex_unlock(&glink->idr_lock);
+
+ kref_put(&channel->refcount, qcom_glink_channel_release);
+}
+
+static void qcom_glink_work(struct work_struct *work)
+{
+ struct qcom_glink *glink = container_of(work, struct qcom_glink,
+ rx_work);
+ struct glink_defer_cmd *dcmd;
+ struct glink_msg *msg;
+ unsigned long flags;
+ unsigned int param1;
+ unsigned int param2;
+ unsigned int cmd;
+
+ for (;;) {
+ spin_lock_irqsave(&glink->rx_lock, flags);
+ if (list_empty(&glink->rx_queue)) {
+ spin_unlock_irqrestore(&glink->rx_lock, flags);
+ break;
+ }
+ dcmd = list_first_entry(&glink->rx_queue,
+ struct glink_defer_cmd, node);
+ list_del(&dcmd->node);
+ spin_unlock_irqrestore(&glink->rx_lock, flags);
+
+ msg = &dcmd->msg;
+ cmd = le16_to_cpu(msg->cmd);
+ param1 = le16_to_cpu(msg->param1);
+ param2 = le32_to_cpu(msg->param2);
+
+ switch (cmd) {
+ case RPM_CMD_VERSION:
+ qcom_glink_send_version_ack(glink);
+ break;
+ case RPM_CMD_VERSION_ACK:
+ break;
+ case RPM_CMD_OPEN:
+ qcom_glink_rx_open(glink, param1, msg->data);
+ break;
+ case RPM_CMD_CLOSE:
+ qcom_glink_rx_close(glink, param1);
+ break;
+ case RPM_CMD_CLOSE_ACK:
+ qcom_glink_rx_close_ack(glink, param1);
+ break;
+ default:
+ WARN(1, "Unknown defer object %d\n", cmd);
+ break;
+ }
+
+ kfree(dcmd);
+ }
+}
+
+struct qcom_glink *qcom_glink_native_probe(struct device *dev,
+ struct qcom_glink_pipe *rx,
+ struct qcom_glink_pipe *tx)
+{
+ int irq;
+ int ret;
+ struct qcom_glink *glink;
+
+ glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL);
+ if (!glink)
+ return ERR_PTR(-ENOMEM);
+
+ glink->dev = dev;
+ glink->tx_pipe = tx;
+ glink->rx_pipe = rx;
+
+ mutex_init(&glink->tx_lock);
+ spin_lock_init(&glink->rx_lock);
+ INIT_LIST_HEAD(&glink->rx_queue);
+ INIT_WORK(&glink->rx_work, qcom_glink_work);
+
+ mutex_init(&glink->idr_lock);
+ idr_init(&glink->lcids);
+ idr_init(&glink->rcids);
+
+ glink->mbox_client.dev = dev;
+ glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0);
+ if (IS_ERR(glink->mbox_chan)) {
+ if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER)
+ dev_err(dev, "failed to acquire IPC channel\n");
+ return ERR_CAST(glink->mbox_chan);
+ }
+
+ irq = of_irq_get(dev->of_node, 0);
+ ret = devm_request_irq(dev, irq,
+ qcom_glink_native_intr,
+ IRQF_NO_SUSPEND | IRQF_SHARED,
+ "glink-native", glink);
+ if (ret) {
+ dev_err(dev, "failed to request IRQ\n");
+ return ERR_PTR(ret);
+ }
+
+ glink->irq = irq;
+
+ ret = qcom_glink_send_version(glink);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return glink;
+}
+
+static int qcom_glink_remove_device(struct device *dev, void *data)
+{
+ device_unregister(dev);
+
+ return 0;
+}
+
+void qcom_glink_native_remove(struct qcom_glink *glink)
+{
+ struct glink_channel *channel;
+ int cid;
+ int ret;
+
+ disable_irq(glink->irq);
+ cancel_work_sync(&glink->rx_work);
+
+ ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device);
+ if (ret)
+ dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret);
+
+ /* Release any defunct local channels, waiting for close-ack */
+ idr_for_each_entry(&glink->lcids, channel, cid)
+ kref_put(&channel->refcount, qcom_glink_channel_release);
+
+ idr_destroy(&glink->lcids);
+ idr_destroy(&glink->rcids);
+}
--- /dev/null
+/*
+ * Copyright (c) 2016-2017, Linaro Ltd
+ *
+ * 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.
+ */
+
+#ifndef __QCOM_GLINK_NATIVE_H__
+#define __QCOM_GLINK_NATIVE_H__
+
+struct qcom_glink_pipe {
+ size_t length;
+
+ size_t (*avail)(struct qcom_glink_pipe *glink_pipe);
+
+ void (*peak)(struct qcom_glink_pipe *glink_pipe, void *data,
+ size_t count);
+ void (*advance)(struct qcom_glink_pipe *glink_pipe, size_t count);
+
+ void (*write)(struct qcom_glink_pipe *glink_pipe,
+ const void *hdr, size_t hlen,
+ const void *data, size_t dlen);
+};
+
+struct qcom_glink;
+
+struct qcom_glink *qcom_glink_native_probe(struct device *dev,
+ struct qcom_glink_pipe *rx,
+ struct qcom_glink_pipe *tx);
+void qcom_glink_native_remove(struct qcom_glink *glink);
+
+#endif
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
-#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/rpmsg.h>
#include <linux/mailbox_client.h>
#include "rpmsg_internal.h"
+#include "qcom_glink_native.h"
#define RPM_TOC_SIZE 256
#define RPM_TOC_MAGIC 0x67727430 /* grt0 */
#define RPM_TX_FIFO_ID 0x61703272 /* ap2r */
#define RPM_RX_FIFO_ID 0x72326170 /* r2ap */
-#define GLINK_NAME_SIZE 32
-
-#define RPM_GLINK_CID_MIN 1
-#define RPM_GLINK_CID_MAX 65536
-
-#define to_rpm_pipe(p) container_of(p, struct glink_rpm_pipe, native)
+#define to_rpm_pipe(p) container_of(p, struct glink_rpm_pipe, native)
struct rpm_toc_entry {
__le32 id;
__le32 size;
} __packed;
-struct qcom_glink;
-
-struct qcom_glink_pipe {
- size_t length;
-
- size_t (*avail)(struct qcom_glink_pipe *glink_pipe);
- void (*peak)(struct qcom_glink_pipe *glink_pipe, void *data,
- size_t count);
- void (*advance)(struct qcom_glink_pipe *glink_pipe, size_t count);
- void (*write)(struct qcom_glink_pipe *glink_pipe,
- const void *hdr, size_t hlen,
- const void *data, size_t dlen);
-};
-
struct rpm_toc {
__le32 magic;
__le32 count;
struct rpm_toc_entry entries[];
} __packed;
-struct glink_msg {
- __le16 cmd;
- __le16 param1;
- __le32 param2;
- u8 data[];
-} __packed;
-
struct glink_rpm_pipe {
struct qcom_glink_pipe native;
void __iomem *fifo;
};
-/**
- * struct glink_defer_cmd - deferred incoming control message
- * @node: list node
- * @msg: message header
- * data: payload of the message
- *
- * Copy of a received control message, to be added to @rx_queue and processed
- * by @rx_work of @glink_rpm.
- */
-struct glink_defer_cmd {
- struct list_head node;
-
- struct glink_msg msg;
- u8 data[];
-};
-
-/**
- * struct glink_rpm - driver context, relates to one remote subsystem
- * @dev: reference to the associated struct device
- * @doorbell: "rpm_hlos" ipc doorbell
- * @rx_pipe: pipe object for receive FIFO
- * @tx_pipe: pipe object for transmit FIFO
- * @irq: IRQ for signaling incoming events
- * @rx_work: worker for handling received control messages
- * @rx_lock: protects the @rx_queue
- * @rx_queue: queue of received control messages to be processed in @rx_work
- * @tx_lock: synchronizes operations on the tx fifo
- * @idr_lock: synchronizes @lcids and @rcids modifications
- * @lcids: idr of all channels with a known local channel id
- * @rcids: idr of all channels with a known remote channel id
- */
-struct qcom_glink {
- struct device *dev;
-
- struct mbox_client mbox_client;
- struct mbox_chan *mbox_chan;
-
- struct qcom_glink_pipe *rx_pipe;
- struct qcom_glink_pipe *tx_pipe;
-
- int irq;
-
- struct work_struct rx_work;
- spinlock_t rx_lock;
- struct list_head rx_queue;
-
- struct mutex tx_lock;
-
- struct mutex idr_lock;
- struct idr lcids;
- struct idr rcids;
-};
-
-enum {
- GLINK_STATE_CLOSED,
- GLINK_STATE_OPENING,
- GLINK_STATE_OPEN,
- GLINK_STATE_CLOSING,
-};
-
-/**
- * struct glink_channel - internal representation of a channel
- * @rpdev: rpdev reference, only used for primary endpoints
- * @ept: rpmsg endpoint this channel is associated with
- * @glink: qcom_glink context handle
- * @refcount: refcount for the channel object
- * @recv_lock: guard for @ept.cb
- * @name: unique channel name/identifier
- * @lcid: channel id, in local space
- * @rcid: channel id, in remote space
- * @buf: receive buffer, for gathering fragments
- * @buf_offset: write offset in @buf
- * @buf_size: size of current @buf
- * @open_ack: completed once remote has acked the open-request
- * @open_req: completed once open-request has been received
- */
-struct glink_channel {
- struct rpmsg_endpoint ept;
-
- struct rpmsg_device *rpdev;
- struct qcom_glink *glink;
-
- struct kref refcount;
-
- spinlock_t recv_lock;
-
- char *name;
- unsigned int lcid;
- unsigned int rcid;
-
- void *buf;
- int buf_offset;
- int buf_size;
-
- struct completion open_ack;
- struct completion open_req;
-};
-
-#define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept)
-
-static const struct rpmsg_endpoint_ops glink_endpoint_ops;
-
-#define RPM_CMD_VERSION 0
-#define RPM_CMD_VERSION_ACK 1
-#define RPM_CMD_OPEN 2
-#define RPM_CMD_CLOSE 3
-#define RPM_CMD_OPEN_ACK 4
-#define RPM_CMD_TX_DATA 9
-#define RPM_CMD_CLOSE_ACK 11
-#define RPM_CMD_TX_DATA_CONT 12
-#define RPM_CMD_READ_NOTIF 13
-
-#define GLINK_FEATURE_INTENTLESS BIT(1)
-
-static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink,
- const char *name)
-{
- struct glink_channel *channel;
-
- channel = kzalloc(sizeof(*channel), GFP_KERNEL);
- if (!channel)
- return ERR_PTR(-ENOMEM);
-
- /* Setup glink internal glink_channel data */
- spin_lock_init(&channel->recv_lock);
- channel->glink = glink;
- channel->name = kstrdup(name, GFP_KERNEL);
-
- init_completion(&channel->open_req);
- init_completion(&channel->open_ack);
-
- kref_init(&channel->refcount);
-
- return channel;
-}
-
-static void qcom_glink_channel_release(struct kref *ref)
-{
- struct glink_channel *channel = container_of(ref, struct glink_channel,
- refcount);
-
- kfree(channel->name);
- kfree(channel);
-}
-
static size_t glink_rpm_rx_avail(struct qcom_glink_pipe *glink_pipe)
{
struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe);
return head - tail;
}
-static size_t qcom_glink_rx_avail(struct qcom_glink *glink)
-{
- return glink->rx_pipe->avail(glink->rx_pipe);
-}
-
static void glink_rpm_rx_peak(struct qcom_glink_pipe *glink_pipe,
void *data, size_t count)
{
}
}
-static void qcom_glink_rx_peak(struct qcom_glink *glink,
- void *data, size_t count)
-{
- glink->rx_pipe->peak(glink->rx_pipe, data, count);
-}
-
static void glink_rpm_rx_advance(struct qcom_glink_pipe *glink_pipe,
size_t count)
{
writel(tail, pipe->tail);
}
-static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count)
-{
- glink->rx_pipe->advance(glink->rx_pipe, count);
-}
-
static size_t glink_rpm_tx_avail(struct qcom_glink_pipe *glink_pipe)
{
struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe);
return tail - head;
}
-static size_t qcom_glink_tx_avail(struct qcom_glink *glink)
-{
- return glink->tx_pipe->avail(glink->tx_pipe);
-}
-
static unsigned int glink_rpm_tx_write_one(struct glink_rpm_pipe *pipe,
unsigned int head,
const void *data, size_t count)
writel(head, pipe->head);
}
-static void qcom_glink_tx_write(struct qcom_glink *glink,
- const void *hdr, size_t hlen,
- const void *data, size_t dlen)
-{
- glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen);
-}
-
-static int qcom_glink_tx(struct qcom_glink *glink,
- const void *hdr, size_t hlen,
- const void *data, size_t dlen, bool wait)
-{
- unsigned int tlen = hlen + dlen;
- int ret;
-
- /* Reject packets that are too big */
- if (tlen >= glink->tx_pipe->length)
- return -EINVAL;
-
- if (WARN(tlen % 8, "Unaligned TX request"))
- return -EINVAL;
-
- ret = mutex_lock_interruptible(&glink->tx_lock);
- if (ret)
- return ret;
-
- while (qcom_glink_tx_avail(glink) < tlen) {
- if (!wait) {
- ret = -ENOMEM;
- goto out;
- }
-
- msleep(10);
- }
-
- qcom_glink_tx_write(glink, hdr, hlen, data, dlen);
-
- mbox_send_message(glink->mbox_chan, NULL);
- mbox_client_txdone(glink->mbox_chan, 0);
-
-out:
- mutex_unlock(&glink->tx_lock);
-
- return ret;
-}
-
-static int qcom_glink_send_version(struct qcom_glink *glink)
-{
- struct glink_msg msg;
-
- msg.cmd = cpu_to_le16(RPM_CMD_VERSION);
- msg.param1 = cpu_to_le16(1);
- msg.param2 = cpu_to_le32(GLINK_FEATURE_INTENTLESS);
-
- return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
-}
-
-static void qcom_glink_send_version_ack(struct qcom_glink *glink)
-{
- struct glink_msg msg;
-
- msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK);
- msg.param1 = cpu_to_le16(1);
- msg.param2 = cpu_to_le32(0);
-
- qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
-}
-
-static void qcom_glink_send_open_ack(struct qcom_glink *glink,
- struct glink_channel *channel)
-{
- struct glink_msg msg;
-
- msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK);
- msg.param1 = cpu_to_le16(channel->rcid);
- msg.param2 = cpu_to_le32(0);
-
- qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
-}
-
-/**
- * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote
- * @glink:
- * @channel:
- *
- * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote.
- * Will return with refcount held, regardless of outcome.
- *
- * Returns 0 on success, negative errno otherwise.
- */
-static int qcom_glink_send_open_req(struct qcom_glink *glink,
- struct glink_channel *channel)
-{
- struct {
- struct glink_msg msg;
- u8 name[GLINK_NAME_SIZE];
- } __packed req;
- int name_len = strlen(channel->name) + 1;
- int req_len = ALIGN(sizeof(req.msg) + name_len, 8);
- int ret;
-
- kref_get(&channel->refcount);
-
- mutex_lock(&glink->idr_lock);
- ret = idr_alloc_cyclic(&glink->lcids, channel,
- RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, GFP_KERNEL);
- mutex_unlock(&glink->idr_lock);
- if (ret < 0)
- return ret;
-
- channel->lcid = ret;
-
- req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN);
- req.msg.param1 = cpu_to_le16(channel->lcid);
- req.msg.param2 = cpu_to_le32(name_len);
- strcpy(req.name, channel->name);
-
- ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true);
- if (ret)
- goto remove_idr;
-
- return 0;
-
-remove_idr:
- mutex_lock(&glink->idr_lock);
- idr_remove(&glink->lcids, channel->lcid);
- channel->lcid = 0;
- mutex_unlock(&glink->idr_lock);
-
- return ret;
-}
-
-static void qcom_glink_send_close_req(struct qcom_glink *glink,
- struct glink_channel *channel)
-{
- struct glink_msg req;
-
- req.cmd = cpu_to_le16(RPM_CMD_CLOSE);
- req.param1 = cpu_to_le16(channel->lcid);
- req.param2 = 0;
-
- qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
-}
-
-static void qcom_glink_send_close_ack(struct qcom_glink *glink,
- unsigned int rcid)
-{
- struct glink_msg req;
-
- req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK);
- req.param1 = cpu_to_le16(rcid);
- req.param2 = 0;
-
- qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
-}
-
-static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra)
-{
- struct glink_defer_cmd *dcmd;
-
- extra = ALIGN(extra, 8);
-
- if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) {
- dev_dbg(glink->dev, "Insufficient data in rx fifo");
- return -ENXIO;
- }
-
- dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC);
- if (!dcmd)
- return -ENOMEM;
-
- INIT_LIST_HEAD(&dcmd->node);
-
- qcom_glink_rx_peak(glink, &dcmd->msg, sizeof(dcmd->msg) + extra);
-
- spin_lock(&glink->rx_lock);
- list_add_tail(&dcmd->node, &glink->rx_queue);
- spin_unlock(&glink->rx_lock);
-
- schedule_work(&glink->rx_work);
- qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra);
-
- return 0;
-}
-
-static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail)
-{
- struct glink_channel *channel;
- struct {
- struct glink_msg msg;
- __le32 chunk_size;
- __le32 left_size;
- } __packed hdr;
- unsigned int chunk_size;
- unsigned int left_size;
- unsigned int rcid;
-
- if (avail < sizeof(hdr)) {
- dev_dbg(glink->dev, "Not enough data in fifo\n");
- return -EAGAIN;
- }
-
- qcom_glink_rx_peak(glink, &hdr, sizeof(hdr));
- chunk_size = le32_to_cpu(hdr.chunk_size);
- left_size = le32_to_cpu(hdr.left_size);
-
- if (avail < sizeof(hdr) + chunk_size) {
- dev_dbg(glink->dev, "Payload not yet in fifo\n");
- return -EAGAIN;
- }
-
- if (WARN(chunk_size % 4, "Incoming data must be word aligned\n"))
- return -EINVAL;
-
- rcid = le16_to_cpu(hdr.msg.param1);
- channel = idr_find(&glink->rcids, rcid);
- if (!channel) {
- dev_dbg(glink->dev, "Data on non-existing channel\n");
-
- /* Drop the message */
- qcom_glink_rx_advance(glink,
- ALIGN(sizeof(hdr) + chunk_size, 8));
- return 0;
- }
-
- /* Might have an ongoing, fragmented, message to append */
- if (!channel->buf) {
- channel->buf = kmalloc(chunk_size + left_size, GFP_ATOMIC);
- if (!channel->buf)
- return -ENOMEM;
-
- channel->buf_size = chunk_size + left_size;
- channel->buf_offset = 0;
- }
-
- qcom_glink_rx_advance(glink, sizeof(hdr));
-
- if (channel->buf_size - channel->buf_offset < chunk_size) {
- dev_err(glink->dev, "Insufficient space in input buffer\n");
-
- /* The packet header lied, drop payload */
- qcom_glink_rx_advance(glink, chunk_size);
- return -ENOMEM;
- }
-
- qcom_glink_rx_peak(glink, channel->buf + channel->buf_offset,
- chunk_size);
- channel->buf_offset += chunk_size;
-
- /* Handle message when no fragments remain to be received */
- if (!left_size) {
- spin_lock(&channel->recv_lock);
- if (channel->ept.cb) {
- channel->ept.cb(channel->ept.rpdev,
- channel->buf,
- channel->buf_offset,
- channel->ept.priv,
- RPMSG_ADDR_ANY);
- }
- spin_unlock(&channel->recv_lock);
-
- kfree(channel->buf);
- channel->buf = NULL;
- channel->buf_size = 0;
- }
-
- /* Each message starts at 8 byte aligned address */
- qcom_glink_rx_advance(glink, ALIGN(chunk_size, 8));
-
- return 0;
-}
-
-static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid)
-{
- struct glink_channel *channel;
-
- channel = idr_find(&glink->lcids, lcid);
- if (!channel) {
- dev_err(glink->dev, "Invalid open ack packet\n");
- return -EINVAL;
- }
-
- complete(&channel->open_ack);
-
- return 0;
-}
-
-static irqreturn_t qcom_glink_intr(int irq, void *data)
-{
- struct qcom_glink *glink = data;
- struct glink_msg msg;
- unsigned int param1;
- unsigned int param2;
- unsigned int avail;
- unsigned int cmd;
- int ret;
-
- for (;;) {
- avail = qcom_glink_rx_avail(glink);
- if (avail < sizeof(msg))
- break;
-
- qcom_glink_rx_peak(glink, &msg, sizeof(msg));
-
- cmd = le16_to_cpu(msg.cmd);
- param1 = le16_to_cpu(msg.param1);
- param2 = le32_to_cpu(msg.param2);
-
- switch (cmd) {
- case RPM_CMD_VERSION:
- case RPM_CMD_VERSION_ACK:
- case RPM_CMD_CLOSE:
- case RPM_CMD_CLOSE_ACK:
- ret = qcom_glink_rx_defer(glink, 0);
- break;
- case RPM_CMD_OPEN_ACK:
- ret = qcom_glink_rx_open_ack(glink, param1);
- qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
- break;
- case RPM_CMD_OPEN:
- ret = qcom_glink_rx_defer(glink, param2);
- break;
- case RPM_CMD_TX_DATA:
- case RPM_CMD_TX_DATA_CONT:
- ret = qcom_glink_rx_data(glink, avail);
- break;
- case RPM_CMD_READ_NOTIF:
- qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
-
- mbox_send_message(glink->mbox_chan, NULL);
- mbox_client_txdone(glink->mbox_chan, 0);
-
- ret = 0;
- break;
- default:
- dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd);
- ret = -EINVAL;
- break;
- }
-
- if (ret)
- break;
- }
-
- return IRQ_HANDLED;
-}
-
-/* Locally initiated rpmsg_create_ept */
-static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink,
- const char *name)
-{
- struct glink_channel *channel;
- int ret;
-
- channel = qcom_glink_alloc_channel(glink, name);
- if (IS_ERR(channel))
- return ERR_CAST(channel);
-
- ret = qcom_glink_send_open_req(glink, channel);
- if (ret)
- goto release_channel;
-
- ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
- if (!ret)
- goto err_timeout;
-
- ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ);
- if (!ret)
- goto err_timeout;
-
- qcom_glink_send_open_ack(glink, channel);
-
- return channel;
-
-err_timeout:
- /* qcom_glink_send_open_req() did register the channel in lcids*/
- mutex_lock(&glink->idr_lock);
- idr_remove(&glink->lcids, channel->lcid);
- mutex_unlock(&glink->idr_lock);
-
-release_channel:
- /* Release qcom_glink_send_open_req() reference */
- kref_put(&channel->refcount, qcom_glink_channel_release);
- /* Release qcom_glink_alloc_channel() reference */
- kref_put(&channel->refcount, qcom_glink_channel_release);
-
- return ERR_PTR(-ETIMEDOUT);
-}
-
-/* Remote initiated rpmsg_create_ept */
-static int qcom_glink_create_remote(struct qcom_glink *glink,
- struct glink_channel *channel)
-{
- int ret;
-
- qcom_glink_send_open_ack(glink, channel);
-
- ret = qcom_glink_send_open_req(glink, channel);
- if (ret)
- goto close_link;
-
- ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
- if (!ret) {
- ret = -ETIMEDOUT;
- goto close_link;
- }
-
- return 0;
-
-close_link:
- /*
- * Send a close request to "undo" our open-ack. The close-ack will
- * release the last reference.
- */
- qcom_glink_send_close_req(glink, channel);
-
- /* Release qcom_glink_send_open_req() reference */
- kref_put(&channel->refcount, qcom_glink_channel_release);
-
- return ret;
-}
-
-static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev,
- rpmsg_rx_cb_t cb,
- void *priv,
- struct rpmsg_channel_info
- chinfo)
-{
- struct glink_channel *parent = to_glink_channel(rpdev->ept);
- struct glink_channel *channel;
- struct qcom_glink *glink = parent->glink;
- struct rpmsg_endpoint *ept;
- const char *name = chinfo.name;
- int cid;
- int ret;
-
- idr_for_each_entry(&glink->rcids, channel, cid) {
- if (!strcmp(channel->name, name))
- break;
- }
-
- if (!channel) {
- channel = qcom_glink_create_local(glink, name);
- if (IS_ERR(channel))
- return NULL;
- } else {
- ret = qcom_glink_create_remote(glink, channel);
- if (ret)
- return NULL;
- }
-
- ept = &channel->ept;
- ept->rpdev = rpdev;
- ept->cb = cb;
- ept->priv = priv;
- ept->ops = &glink_endpoint_ops;
-
- return ept;
-}
-
-static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept)
-{
- struct glink_channel *channel = to_glink_channel(ept);
- struct qcom_glink *glink = channel->glink;
- unsigned long flags;
-
- spin_lock_irqsave(&channel->recv_lock, flags);
- channel->ept.cb = NULL;
- spin_unlock_irqrestore(&channel->recv_lock, flags);
-
- /* Decouple the potential rpdev from the channel */
- channel->rpdev = NULL;
-
- qcom_glink_send_close_req(glink, channel);
-}
-
-static int __qcom_glink_send(struct glink_channel *channel,
- void *data, int len, bool wait)
-{
- struct qcom_glink *glink = channel->glink;
- struct {
- struct glink_msg msg;
- __le32 chunk_size;
- __le32 left_size;
- } __packed req;
-
- if (WARN(len % 8, "RPM GLINK expects 8 byte aligned messages\n"))
- return -EINVAL;
-
- req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA);
- req.msg.param1 = cpu_to_le16(channel->lcid);
- req.msg.param2 = cpu_to_le32(channel->rcid);
- req.chunk_size = cpu_to_le32(len);
- req.left_size = cpu_to_le32(0);
-
- return qcom_glink_tx(glink, &req, sizeof(req), data, len, wait);
-}
-
-static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len)
-{
- struct glink_channel *channel = to_glink_channel(ept);
-
- return __qcom_glink_send(channel, data, len, true);
-}
-
-static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len)
-{
- struct glink_channel *channel = to_glink_channel(ept);
-
- return __qcom_glink_send(channel, data, len, false);
-}
-
-/*
- * Finds the device_node for the glink child interested in this channel.
- */
-static struct device_node *qcom_glink_match_channel(struct device_node *node,
- const char *channel)
-{
- struct device_node *child;
- const char *name;
- const char *key;
- int ret;
-
- for_each_available_child_of_node(node, child) {
- key = "qcom,glink-channels";
- ret = of_property_read_string(child, key, &name);
- if (ret)
- continue;
-
- if (strcmp(name, channel) == 0)
- return child;
- }
-
- return NULL;
-}
-
-static const struct rpmsg_device_ops glink_device_ops = {
- .create_ept = qcom_glink_create_ept,
-};
-
-static const struct rpmsg_endpoint_ops glink_endpoint_ops = {
- .destroy_ept = qcom_glink_destroy_ept,
- .send = qcom_glink_send,
- .trysend = qcom_glink_trysend,
-};
-
-static void qcom_glink_rpdev_release(struct device *dev)
-{
- struct rpmsg_device *rpdev = to_rpmsg_device(dev);
- struct glink_channel *channel = to_glink_channel(rpdev->ept);
-
- channel->rpdev = NULL;
- kfree(rpdev);
-}
-
-static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid,
- char *name)
-{
- struct glink_channel *channel;
- struct rpmsg_device *rpdev;
- bool create_device = false;
- int lcid;
- int ret;
- struct device_node *node;
-
- idr_for_each_entry(&glink->lcids, channel, lcid) {
- if (!strcmp(channel->name, name))
- break;
- }
-
- if (!channel) {
- channel = qcom_glink_alloc_channel(glink, name);
- if (IS_ERR(channel))
- return PTR_ERR(channel);
-
- /* The opening dance was initiated by the remote */
- create_device = true;
- }
-
- mutex_lock(&glink->idr_lock);
- ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_KERNEL);
- if (ret < 0) {
- dev_err(glink->dev, "Unable to insert channel into rcid list\n");
- mutex_unlock(&glink->idr_lock);
- goto free_channel;
- }
- channel->rcid = ret;
- mutex_unlock(&glink->idr_lock);
-
- complete(&channel->open_req);
-
- if (create_device) {
- rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
- if (!rpdev) {
- ret = -ENOMEM;
- goto rcid_remove;
- }
-
- rpdev->ept = &channel->ept;
- strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE);
- rpdev->src = RPMSG_ADDR_ANY;
- rpdev->dst = RPMSG_ADDR_ANY;
- rpdev->ops = &glink_device_ops;
-
- node = qcom_glink_match_channel(glink->dev->of_node, name);
- rpdev->dev.of_node = node;
- rpdev->dev.parent = glink->dev;
- rpdev->dev.release = qcom_glink_rpdev_release;
-
- ret = rpmsg_register_device(rpdev);
- if (ret)
- goto free_rpdev;
-
- channel->rpdev = rpdev;
- }
-
- return 0;
-
-free_rpdev:
- kfree(rpdev);
-rcid_remove:
- mutex_lock(&glink->idr_lock);
- idr_remove(&glink->rcids, channel->rcid);
- channel->rcid = 0;
- mutex_unlock(&glink->idr_lock);
-free_channel:
- /* Release the reference, iff we took it */
- if (create_device)
- kref_put(&channel->refcount, qcom_glink_channel_release);
-
- return ret;
-}
-
-static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid)
-{
- struct rpmsg_channel_info chinfo;
- struct glink_channel *channel;
-
- channel = idr_find(&glink->rcids, rcid);
- if (WARN(!channel, "close request on unknown channel\n"))
- return;
-
- if (channel->rpdev) {
- strncpy(chinfo.name, channel->name, sizeof(chinfo.name));
- chinfo.src = RPMSG_ADDR_ANY;
- chinfo.dst = RPMSG_ADDR_ANY;
-
- rpmsg_unregister_device(glink->dev, &chinfo);
- }
-
- qcom_glink_send_close_ack(glink, channel->rcid);
-
- mutex_lock(&glink->idr_lock);
- idr_remove(&glink->rcids, channel->rcid);
- channel->rcid = 0;
- mutex_unlock(&glink->idr_lock);
-
- kref_put(&channel->refcount, qcom_glink_channel_release);
-}
-
-static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid)
-{
- struct glink_channel *channel;
-
- channel = idr_find(&glink->lcids, lcid);
- if (WARN(!channel, "close ack on unknown channel\n"))
- return;
-
- mutex_lock(&glink->idr_lock);
- idr_remove(&glink->lcids, channel->lcid);
- channel->lcid = 0;
- mutex_unlock(&glink->idr_lock);
-
- kref_put(&channel->refcount, qcom_glink_channel_release);
-}
-
-static void qcom_glink_work(struct work_struct *work)
-{
- struct qcom_glink *glink = container_of(work, struct qcom_glink,
- rx_work);
- struct glink_defer_cmd *dcmd;
- struct glink_msg *msg;
- unsigned long flags;
- unsigned int param1;
- unsigned int param2;
- unsigned int cmd;
-
- for (;;) {
- spin_lock_irqsave(&glink->rx_lock, flags);
- if (list_empty(&glink->rx_queue)) {
- spin_unlock_irqrestore(&glink->rx_lock, flags);
- break;
- }
- dcmd = list_first_entry(&glink->rx_queue, struct glink_defer_cmd, node);
- list_del(&dcmd->node);
- spin_unlock_irqrestore(&glink->rx_lock, flags);
-
- msg = &dcmd->msg;
- cmd = le16_to_cpu(msg->cmd);
- param1 = le16_to_cpu(msg->param1);
- param2 = le32_to_cpu(msg->param2);
-
- switch (cmd) {
- case RPM_CMD_VERSION:
- qcom_glink_send_version_ack(glink);
- break;
- case RPM_CMD_VERSION_ACK:
- break;
- case RPM_CMD_OPEN:
- qcom_glink_rx_open(glink, param1, msg->data);
- break;
- case RPM_CMD_CLOSE:
- qcom_glink_rx_close(glink, param1);
- break;
- case RPM_CMD_CLOSE_ACK:
- qcom_glink_rx_close_ack(glink, param1);
- break;
- default:
- WARN(1, "Unknown defer object %d\n", cmd);
- break;
- }
-
- kfree(dcmd);
- }
-}
-
static int glink_rpm_parse_toc(struct device *dev,
void __iomem *msg_ram,
size_t msg_ram_size,
return -EINVAL;
}
-struct qcom_glink *qcom_glink_native_probe(struct device *dev,
- struct qcom_glink_pipe *rx,
- struct qcom_glink_pipe *tx)
-{
- int irq;
- int ret;
- struct qcom_glink *glink;
-
- glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL);
- if (!glink)
- return ERR_PTR(-ENOMEM);
-
- glink->dev = dev;
- glink->tx_pipe = tx;
- glink->rx_pipe = rx;
-
- mutex_init(&glink->tx_lock);
- spin_lock_init(&glink->rx_lock);
- INIT_LIST_HEAD(&glink->rx_queue);
- INIT_WORK(&glink->rx_work, qcom_glink_work);
-
- mutex_init(&glink->idr_lock);
- idr_init(&glink->lcids);
- idr_init(&glink->rcids);
-
- glink->mbox_client.dev = dev;
- glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0);
- if (IS_ERR(glink->mbox_chan)) {
- if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER)
- dev_err(dev, "failed to acquire IPC channel\n");
- return ERR_CAST(glink->mbox_chan);
- }
-
- irq = of_irq_get(dev->of_node, 0);
- ret = devm_request_irq(dev, irq,
- qcom_glink_intr,
- IRQF_NO_SUSPEND | IRQF_SHARED,
- "glink-native", glink);
- if (ret) {
- dev_err(dev, "failed to request IRQ\n");
- return ERR_PTR(ret);
- }
-
- ret = qcom_glink_send_version(glink);
- if (ret)
- return ERR_PTR(ret);
-
- return glink;
-}
-
static int glink_rpm_probe(struct platform_device *pdev)
{
struct qcom_glink *glink;
return 0;
}
-static int glink_rpm_remove_device(struct device *dev, void *data)
-{
- device_unregister(dev);
-
- return 0;
-}
-
static int glink_rpm_remove(struct platform_device *pdev)
{
struct qcom_glink *glink = platform_get_drvdata(pdev);
- struct glink_channel *channel;
- int cid;
- int ret;
-
- disable_irq(glink->irq);
- cancel_work_sync(&glink->rx_work);
-
- ret = device_for_each_child(glink->dev, NULL, glink_rpm_remove_device);
- if (ret)
- dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret);
-
- /* Release any defunct local channels, waiting for close-ack */
- idr_for_each_entry(&glink->lcids, channel, cid)
- kref_put(&channel->refcount, qcom_glink_channel_release);
- idr_destroy(&glink->lcids);
- idr_destroy(&glink->rcids);
+ qcom_glink_native_remove(glink);
return 0;
}
projects / platform / kernel / linux-rpi3.git / commitdiff