On Wed, 01 Feb 2017, Hugues Fruchet wrote:
> IPC (Inter Process Communication) support for communication with
> DELTA coprocessor firmware using rpmsg kernel framework.
> Based on 4 services open/set_stream/decode/close and their associated
> rpmsg messages.
> The messages structures are duplicated on both host and firmware
> side and are packed (use only of 32 bits size fields in messages
> structures to ensure packing).
> Each service is synchronous; service returns only when firmware
> acknowledges the associated command message.
> Due to significant parameters size exchanged from host to copro,
> parameters are not inserted in rpmsg messages. Instead, parameters are
> stored in physical memory shared between host and coprocessor.
> Memory is non-cacheable, so no special operation is required
> to ensure memory coherency on host and on coprocessor side.
> Multi-instance support and re-entrance are ensured using host_hdl and
> copro_hdl in message header exchanged between both host and coprocessor.
> This avoids to manage tables on both sides to get back the running context
> of each instance.
>
> Signed-off-by: Hugues Fruchet <hugues.fruc...@st.com>
Acked-by: Peter Griffin <peter.grif...@linaro.org>
> ---
> drivers/media/platform/Kconfig | 1 +
> drivers/media/platform/sti/delta/Makefile | 2 +-
> drivers/media/platform/sti/delta/delta-ipc.c | 594
> ++++++++++++++++++++++++++
> drivers/media/platform/sti/delta/delta-ipc.h | 76 ++++
> drivers/media/platform/sti/delta/delta-v4l2.c | 11 +
> drivers/media/platform/sti/delta/delta.h | 21 +
> 6 files changed, 704 insertions(+), 1 deletion(-)
> create mode 100644 drivers/media/platform/sti/delta/delta-ipc.c
> create mode 100644 drivers/media/platform/sti/delta/delta-ipc.h
>
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index 2247d9d..2e82ec6 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -323,6 +323,7 @@ config VIDEO_STI_DELTA_DRIVER
> default n
> select VIDEOBUF2_DMA_CONTIG
> select V4L2_MEM2MEM_DEV
> + select RPMSG
>
> endif # VIDEO_STI_DELTA
>
> diff --git a/drivers/media/platform/sti/delta/Makefile
> b/drivers/media/platform/sti/delta/Makefile
> index 93a3037..b791ba0 100644
> --- a/drivers/media/platform/sti/delta/Makefile
> +++ b/drivers/media/platform/sti/delta/Makefile
> @@ -1,2 +1,2 @@
> obj-$(CONFIG_VIDEO_STI_DELTA_DRIVER) := st-delta.o
> -st-delta-y := delta-v4l2.o delta-mem.o
> +st-delta-y := delta-v4l2.o delta-mem.o delta-ipc.o
> diff --git a/drivers/media/platform/sti/delta/delta-ipc.c
> b/drivers/media/platform/sti/delta/delta-ipc.c
> new file mode 100644
> index 0000000..41e4a4c
> --- /dev/null
> +++ b/drivers/media/platform/sti/delta/delta-ipc.c
> @@ -0,0 +1,594 @@
> +/*
> + * Copyright (C) STMicroelectronics SA 2015
> + * Author: Hugues Fruchet <hugues.fruc...@st.com> for STMicroelectronics.
> + * License terms: GNU General Public License (GPL), version 2
> + */
> +
> +#include <linux/rpmsg.h>
> +
> +#include "delta.h"
> +#include "delta-ipc.h"
> +#include "delta-mem.h"
> +
> +#define IPC_TIMEOUT 100
> +#define IPC_SANITY_TAG 0xDEADBEEF
> +
> +enum delta_ipc_fw_command {
> + DELTA_IPC_OPEN,
> + DELTA_IPC_SET_STREAM,
> + DELTA_IPC_DECODE,
> + DELTA_IPC_CLOSE
> +};
> +
> +#define to_rpmsg_driver(__drv) container_of(__drv, struct rpmsg_driver, drv)
> +#define to_delta(__d) container_of(__d, struct delta_dev, rpmsg_driver)
> +
> +#define to_ctx(hdl) ((struct delta_ipc_ctx *)hdl)
> +#define to_pctx(ctx) container_of(ctx, struct delta_ctx, ipc_ctx)
> +
> +struct delta_ipc_header_msg {
> + u32 tag;
> + void *host_hdl;
> + u32 copro_hdl;
> + u32 command;
> +};
> +
> +#define to_host_hdl(ctx) ((void *)ctx)
> +
> +#define msg_to_ctx(msg) ((struct delta_ipc_ctx *)(msg)->header.host_hdl)
> +#define msg_to_copro_hdl(msg) ((msg)->header.copro_hdl)
> +
> +static inline dma_addr_t to_paddr(struct delta_ipc_ctx *ctx, void *vaddr)
> +{
> + return (ctx->ipc_buf->paddr + (vaddr - ctx->ipc_buf->vaddr));
> +}
> +
> +static inline bool is_valid_data(struct delta_ipc_ctx *ctx,
> + void *data, u32 size)
> +{
> + return ((data >= ctx->ipc_buf->vaddr) &&
> + ((data + size) <= (ctx->ipc_buf->vaddr + ctx->ipc_buf->size)));
> +}
> +
> +/*
> + * IPC shared memory (@ipc_buf_size, @ipc_buf_paddr) is sent to copro
> + * at each instance opening. This memory is allocated by IPC client
> + * and given through delta_ipc_open(). All messages parameters
> + * (open, set_stream, decode) will have their phy address within
> + * this IPC shared memory, avoiding de-facto recopies inside delta-ipc.
> + * All the below messages structures are used on both host and firmware
> + * side and are packed (use only of 32 bits size fields in messages
> + * structures to ensure packing):
> + * - struct delta_ipc_open_msg
> + * - struct delta_ipc_set_stream_msg
> + * - struct delta_ipc_decode_msg
> + * - struct delta_ipc_close_msg
> + * - struct delta_ipc_cb_msg
> + */
> +struct delta_ipc_open_msg {
> + struct delta_ipc_header_msg header;
> + u32 ipc_buf_size;
> + dma_addr_t ipc_buf_paddr;
> + char name[32];
> + u32 param_size;
> + dma_addr_t param_paddr;
> +};
> +
> +struct delta_ipc_set_stream_msg {
> + struct delta_ipc_header_msg header;
> + u32 param_size;
> + dma_addr_t param_paddr;
> +};
> +
> +struct delta_ipc_decode_msg {
> + struct delta_ipc_header_msg header;
> + u32 param_size;
> + dma_addr_t param_paddr;
> + u32 status_size;
> + dma_addr_t status_paddr;
> +};
> +
> +struct delta_ipc_close_msg {
> + struct delta_ipc_header_msg header;
> +};
> +
> +struct delta_ipc_cb_msg {
> + struct delta_ipc_header_msg header;
> + int err;
> +};
> +
> +static void build_msg_header(struct delta_ipc_ctx *ctx,
> + enum delta_ipc_fw_command command,
> + struct delta_ipc_header_msg *header)
> +{
> + header->tag = IPC_SANITY_TAG;
> + header->host_hdl = to_host_hdl(ctx);
> + header->copro_hdl = ctx->copro_hdl;
> + header->command = command;
> +}
> +
> +int delta_ipc_open(struct delta_ctx *pctx, const char *name,
> + struct delta_ipc_param *param, u32 ipc_buf_size,
> + struct delta_buf **ipc_buf, void **hdl)
> +{
> + struct delta_dev *delta = pctx->dev;
> + struct rpmsg_device *rpmsg_device = delta->rpmsg_device;
> + struct delta_ipc_ctx *ctx = &pctx->ipc_ctx;
> + struct delta_ipc_open_msg msg;
> + struct delta_buf *buf = &ctx->ipc_buf_struct;
> + int ret;
> +
> + if (!rpmsg_device) {
> + dev_err(delta->dev,
> + "%s ipc: failed to open, rpmsg is not initialized\n",
> + pctx->name);
> + pctx->sys_errors++;
> + return -EINVAL;
> + }
> +
> + if (!name) {
> + dev_err(delta->dev,
> + "%s ipc: failed to open, no name given\n",
> + pctx->name);
> + return -EINVAL;
> + }
> +
> + if (!param || !param->data || !param->size) {
> + dev_err(delta->dev,
> + "%s ipc: failed to open, empty parameter\n",
> + pctx->name);
> + return -EINVAL;
> + }
> +
> + if (!ipc_buf_size) {
> + dev_err(delta->dev,
> + "%s ipc: failed to open, no size given for ipc
> buffer\n",
> + pctx->name);
> + return -EINVAL;
> + }
> +
> + if (param->size > ipc_buf_size) {
> + dev_err(delta->dev,
> + "%s ipc: failed to open, too large ipc parameter (%d
> bytes while max %d expected)\n",
> + pctx->name,
> + param->size, ctx->ipc_buf->size);
> + return -EINVAL;
> + }
> +
> + /* init */
> + init_completion(&ctx->done);
> +
> + /*
> + * allocation of contiguous buffer for
> + * data of commands exchanged between
> + * host and firmware coprocessor
> + */
> + ret = hw_alloc(pctx, ipc_buf_size,
> + "ipc data buffer", buf);
> + if (ret)
> + return ret;
> + ctx->ipc_buf = buf;
> +
> + /* build rpmsg message */
> + build_msg_header(ctx, DELTA_IPC_OPEN, &msg.header);
> +
> + msg.ipc_buf_size = ipc_buf_size;
> + msg.ipc_buf_paddr = ctx->ipc_buf->paddr;
> +
> + memcpy(msg.name, name, sizeof(msg.name));
> + msg.name[sizeof(msg.name) - 1] = 0;
> +
> + msg.param_size = param->size;
> + memcpy(ctx->ipc_buf->vaddr, param->data, msg.param_size);
> + msg.param_paddr = ctx->ipc_buf->paddr;
> +
> + /* send it */
> + ret = rpmsg_send(rpmsg_device->ept, &msg, sizeof(msg));
> + if (ret) {
> + dev_err(delta->dev,
> + "%s ipc: failed to open, rpmsg_send failed (%d) for
> DELTA_IPC_OPEN (name=%s, size=%d, data=%p)\n",
> + pctx->name,
> + ret, name, param->size, param->data);
> + goto err;
> + }
> +
> + /* wait for acknowledge */
> + if (!wait_for_completion_timeout
> + (&ctx->done, msecs_to_jiffies(IPC_TIMEOUT))) {
> + dev_err(delta->dev,
> + "%s ipc: failed to open, timeout waiting for
> DELTA_IPC_OPEN callback (name=%s, size=%d, data=%p)\n",
> + pctx->name,
> + name, param->size, param->data);
> + ret = -ETIMEDOUT;
> + goto err;
> + }
> +
> + /* command completed, check error */
> + if (ctx->cb_err) {
> + dev_err(delta->dev,
> + "%s ipc: failed to open, DELTA_IPC_OPEN completed but
> with error (%d) (name=%s, size=%d, data=%p)\n",
> + pctx->name,
> + ctx->cb_err, name, param->size, param->data);
> + ret = -EIO;
> + goto err;
> + }
> +
> + *ipc_buf = ctx->ipc_buf;
> + *hdl = (void *)ctx;
> +
> + return 0;
> +
> +err:
> + pctx->sys_errors++;
> + if (ctx->ipc_buf) {
> + hw_free(pctx, ctx->ipc_buf);
> + ctx->ipc_buf = NULL;
> + }
> +
> + return ret;
> +};
> +
> +int delta_ipc_set_stream(void *hdl, struct delta_ipc_param *param)
> +{
> + struct delta_ipc_ctx *ctx = to_ctx(hdl);
> + struct delta_ctx *pctx = to_pctx(ctx);
> + struct delta_dev *delta = pctx->dev;
> + struct rpmsg_device *rpmsg_device = delta->rpmsg_device;
> + struct delta_ipc_set_stream_msg msg;
> + int ret;
> +
> + if (!hdl) {
> + dev_err(delta->dev,
> + "%s ipc: failed to set stream, invalid ipc handle\n",
> + pctx->name);
> + return -EINVAL;
> + }
> +
> + if (!rpmsg_device) {
> + dev_err(delta->dev,
> + "%s ipc: failed to set stream, rpmsg is not
> initialized\n",
> + pctx->name);
> + return -EINVAL;
> + }
> +
> + if (!param || !param->data || !param->size) {
> + dev_err(delta->dev,
> + "%s ipc: failed to set stream, empty parameter\n",
> + pctx->name);
> + return -EINVAL;
> + }
> +
> + if (param->size > ctx->ipc_buf->size) {
> + dev_err(delta->dev,
> + "%s ipc: failed to set stream, too large ipc
> parameter(%d bytes while max %d expected)\n",
> + pctx->name,
> + param->size, ctx->ipc_buf->size);
> + return -EINVAL;
> + }
> +
> + if (!is_valid_data(ctx, param->data, param->size)) {
> + dev_err(delta->dev,
> + "%s ipc: failed to set stream, parameter is not in
> expected address range (size=%d, data=%p not in %p..%p)\n",
> + pctx->name,
> + param->size,
> + param->data,
> + ctx->ipc_buf->vaddr,
> + ctx->ipc_buf->vaddr + ctx->ipc_buf->size - 1);
> + return -EINVAL;
> + }
> +
> + /* build rpmsg message */
> + build_msg_header(ctx, DELTA_IPC_SET_STREAM, &msg.header);
> +
> + msg.param_size = param->size;
> + msg.param_paddr = to_paddr(ctx, param->data);
> +
> + /* send it */
> + ret = rpmsg_send(rpmsg_device->ept, &msg, sizeof(msg));
> + if (ret) {
> + dev_err(delta->dev,
> + "%s ipc: failed to set stream, rpmsg_send failed (%d)
> for DELTA_IPC_SET_STREAM (size=%d, data=%p)\n",
> + pctx->name,
> + ret, param->size, param->data);
> + pctx->sys_errors++;
> + return ret;
> + }
> +
> + /* wait for acknowledge */
> + if (!wait_for_completion_timeout
> + (&ctx->done, msecs_to_jiffies(IPC_TIMEOUT))) {
> + dev_err(delta->dev,
> + "%s ipc: failed to set stream, timeout waiting for
> DELTA_IPC_SET_STREAM callback (size=%d, data=%p)\n",
> + pctx->name,
> + param->size, param->data);
> + pctx->sys_errors++;
> + return -ETIMEDOUT;
> + }
> +
> + /* command completed, check status */
> + if (ctx->cb_err) {
> + dev_err(delta->dev,
> + "%s ipc: failed to set stream, DELTA_IPC_SET_STREAM
> completed but with error (%d) (size=%d, data=%p)\n",
> + pctx->name,
> + ctx->cb_err, param->size, param->data);
> + pctx->sys_errors++;
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +int delta_ipc_decode(void *hdl, struct delta_ipc_param *param,
> + struct delta_ipc_param *status)
> +{
> + struct delta_ipc_ctx *ctx = to_ctx(hdl);
> + struct delta_ctx *pctx = to_pctx(ctx);
> + struct delta_dev *delta = pctx->dev;
> + struct rpmsg_device *rpmsg_device = delta->rpmsg_device;
> + struct delta_ipc_decode_msg msg;
> + int ret;
> +
> + if (!hdl) {
> + dev_err(delta->dev,
> + "%s ipc: failed to decode, invalid ipc handle\n",
> + pctx->name);
> + return -EINVAL;
> + }
> +
> + if (!rpmsg_device) {
> + dev_err(delta->dev,
> + "%s ipc: failed to decode, rpmsg is not
> initialized\n",
> + pctx->name);
> + return -EINVAL;
> + }
> +
> + if (!param || !param->data || !param->size) {
> + dev_err(delta->dev,
> + "%s ipc: failed to decode, empty parameter\n",
> + pctx->name);
> + return -EINVAL;
> + }
> +
> + if (!status || !status->data || !status->size) {
> + dev_err(delta->dev,
> + "%s ipc: failed to decode, empty status\n",
> + pctx->name);
> + return -EINVAL;
> + }
> +
> + if (param->size + status->size > ctx->ipc_buf->size) {
> + dev_err(delta->dev,
> + "%s ipc: failed to decode, too large ipc parameter
> (%d bytes (param) + %d bytes (status) while max %d expected)\n",
> + pctx->name,
> + param->size,
> + status->size,
> + ctx->ipc_buf->size);
> + return -EINVAL;
> + }
> +
> + if (!is_valid_data(ctx, param->data, param->size)) {
> + dev_err(delta->dev,
> + "%s ipc: failed to decode, parameter is not in
> expected address range (size=%d, data=%p not in %p..%p)\n",
> + pctx->name,
> + param->size,
> + param->data,
> + ctx->ipc_buf->vaddr,
> + ctx->ipc_buf->vaddr + ctx->ipc_buf->size - 1);
> + return -EINVAL;
> + }
> +
> + if (!is_valid_data(ctx, status->data, status->size)) {
> + dev_err(delta->dev,
> + "%s ipc: failed to decode, status is not in expected
> address range (size=%d, data=%p not in %p..%p)\n",
> + pctx->name,
> + status->size,
> + status->data,
> + ctx->ipc_buf->vaddr,
> + ctx->ipc_buf->vaddr + ctx->ipc_buf->size - 1);
> + return -EINVAL;
> + }
> +
> + /* build rpmsg message */
> + build_msg_header(ctx, DELTA_IPC_DECODE, &msg.header);
> +
> + msg.param_size = param->size;
> + msg.param_paddr = to_paddr(ctx, param->data);
> +
> + msg.status_size = status->size;
> + msg.status_paddr = to_paddr(ctx, status->data);
> +
> + /* send it */
> + ret = rpmsg_send(rpmsg_device->ept, &msg, sizeof(msg));
> + if (ret) {
> + dev_err(delta->dev,
> + "%s ipc: failed to decode, rpmsg_send failed (%d) for
> DELTA_IPC_DECODE (size=%d, data=%p)\n",
> + pctx->name,
> + ret, param->size, param->data);
> + pctx->sys_errors++;
> + return ret;
> + }
> +
> + /* wait for acknowledge */
> + if (!wait_for_completion_timeout
> + (&ctx->done, msecs_to_jiffies(IPC_TIMEOUT))) {
> + dev_err(delta->dev,
> + "%s ipc: failed to decode, timeout waiting for
> DELTA_IPC_DECODE callback (size=%d, data=%p)\n",
> + pctx->name,
> + param->size, param->data);
> + pctx->sys_errors++;
> + return -ETIMEDOUT;
> + }
> +
> + /* command completed, check status */
> + if (ctx->cb_err) {
> + dev_err(delta->dev,
> + "%s ipc: failed to decode, DELTA_IPC_DECODE completed
> but with error (%d) (size=%d, data=%p)\n",
> + pctx->name,
> + ctx->cb_err, param->size, param->data);
> + pctx->sys_errors++;
> + return -EIO;
> + }
> +
> + return 0;
> +};
> +
> +void delta_ipc_close(void *hdl)
> +{
> + struct delta_ipc_ctx *ctx = to_ctx(hdl);
> + struct delta_ctx *pctx = to_pctx(ctx);
> + struct delta_dev *delta = pctx->dev;
> + struct rpmsg_device *rpmsg_device = delta->rpmsg_device;
> + struct delta_ipc_close_msg msg;
> + int ret;
> +
> + if (!hdl) {
> + dev_err(delta->dev,
> + "%s ipc: failed to close, invalid ipc handle\n",
> + pctx->name);
> + return;
> + }
> +
> + if (ctx->ipc_buf) {
> + hw_free(pctx, ctx->ipc_buf);
> + ctx->ipc_buf = NULL;
> + }
> +
> + if (!rpmsg_device) {
> + dev_err(delta->dev,
> + "%s ipc: failed to close, rpmsg is not initialized\n",
> + pctx->name);
> + return;
> + }
> +
> + /* build rpmsg message */
> + build_msg_header(ctx, DELTA_IPC_CLOSE, &msg.header);
> +
> + /* send it */
> + ret = rpmsg_send(rpmsg_device->ept, &msg, sizeof(msg));
> + if (ret) {
> + dev_err(delta->dev,
> + "%s ipc: failed to close, rpmsg_send failed (%d) for
> DELTA_IPC_CLOSE\n",
> + pctx->name, ret);
> + pctx->sys_errors++;
> + return;
> + }
> +
> + /* wait for acknowledge */
> + if (!wait_for_completion_timeout
> + (&ctx->done, msecs_to_jiffies(IPC_TIMEOUT))) {
> + dev_err(delta->dev,
> + "%s ipc: failed to close, timeout waiting for
> DELTA_IPC_CLOSE callback\n",
> + pctx->name);
> + pctx->sys_errors++;
> + return;
> + }
> +
> + /* command completed, check status */
> + if (ctx->cb_err) {
> + dev_err(delta->dev,
> + "%s ipc: failed to close, DELTA_IPC_CLOSE completed
> but with error (%d)\n",
> + pctx->name, ctx->cb_err);
> + pctx->sys_errors++;
> + }
> +};
> +
> +static int delta_ipc_cb(struct rpmsg_device *rpdev, void *data,
> + int len, void *priv, u32 src)
> +{
> + struct delta_ipc_ctx *ctx;
> + struct delta_ipc_cb_msg *msg;
> +
> + /* sanity check */
> + if (!rpdev) {
> + dev_err(NULL, "rpdev is NULL\n");
> + return -EINVAL;
> + }
> +
> + if (!data || !len) {
> + dev_err(&rpdev->dev,
> + "unexpected empty message received from src=%d\n", src);
> + return -EINVAL;
> + }
> +
> + if (len != sizeof(*msg)) {
> + dev_err(&rpdev->dev,
> + "unexpected message length received from src=%d
> (received %d bytes while %zu bytes expected)\n",
> + len, src, sizeof(*msg));
> + return -EINVAL;
> + }
> +
> + msg = (struct delta_ipc_cb_msg *)data;
> + if (msg->header.tag != IPC_SANITY_TAG) {
> + dev_err(&rpdev->dev,
> + "unexpected message tag received from src=%d (received
> %x tag while %x expected)\n",
> + src, msg->header.tag, IPC_SANITY_TAG);
> + return -EINVAL;
> + }
> +
> + ctx = msg_to_ctx(msg);
> + if (!ctx) {
> + dev_err(&rpdev->dev,
> + "unexpected message with NULL host_hdl received from
> src=%d\n",
> + src);
> + return -EINVAL;
> + }
> +
> + /*
> + * if not already known, save copro instance context
> + * to ensure re-entrance on copro side
> + */
> + if (!ctx->copro_hdl)
> + ctx->copro_hdl = msg_to_copro_hdl(msg);
> +
> + /*
> + * all is fine,
> + * update status & complete command
> + */
> + ctx->cb_err = msg->err;
> + complete(&ctx->done);
> +
> + return 0;
> +}
> +
> +static int delta_ipc_probe(struct rpmsg_device *rpmsg_device)
> +{
> + struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpmsg_device->dev.driver);
> + struct delta_dev *delta = to_delta(rpdrv);
> +
> + delta->rpmsg_device = rpmsg_device;
> +
> + return 0;
> +}
> +
> +static void delta_ipc_remove(struct rpmsg_device *rpmsg_device)
> +{
> + struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpmsg_device->dev.driver);
> + struct delta_dev *delta = to_delta(rpdrv);
> +
> + delta->rpmsg_device = NULL;
> +}
> +
> +static struct rpmsg_device_id delta_ipc_device_id_table[] = {
> + {.name = "rpmsg-delta"},
> + {},
> +};
> +
> +static struct rpmsg_driver delta_rpmsg_driver = {
> + .drv = {.name = KBUILD_MODNAME},
> + .id_table = delta_ipc_device_id_table,
> + .probe = delta_ipc_probe,
> + .callback = delta_ipc_cb,
> + .remove = delta_ipc_remove,
> +};
> +
> +int delta_ipc_init(struct delta_dev *delta)
> +{
> + delta->rpmsg_driver = delta_rpmsg_driver;
> +
> + return register_rpmsg_driver(&delta->rpmsg_driver);
> +}
> +
> +void delta_ipc_exit(struct delta_dev *delta)
> +{
> + unregister_rpmsg_driver(&delta->rpmsg_driver);
> +}
> diff --git a/drivers/media/platform/sti/delta/delta-ipc.h
> b/drivers/media/platform/sti/delta/delta-ipc.h
> new file mode 100644
> index 0000000..cef2019
> --- /dev/null
> +++ b/drivers/media/platform/sti/delta/delta-ipc.h
> @@ -0,0 +1,76 @@
> +/*
> + * Copyright (C) STMicroelectronics SA 2015
> + * Author: Hugues Fruchet <hugues.fruc...@st.com> for STMicroelectronics.
> + * License terms: GNU General Public License (GPL), version 2
> + */
> +
> +#ifndef DELTA_IPC_H
> +#define DELTA_IPC_H
> +
> +int delta_ipc_init(struct delta_dev *delta);
> +void delta_ipc_exit(struct delta_dev *delta);
> +
> +/*
> + * delta_ipc_open - open a decoding instance on firmware side
> + * @ctx: (in) delta context
> + * @name: (in) name of decoder to be used
> + * @param: (in) open command parameters specific to decoder
> + * @param.size: (in) size of parameter
> + * @param.data: (in) virtual address of parameter
> + * @ipc_buf_size: (in) size of IPC shared buffer between host
> + * and copro used to share command data.
> + * Client have to set here the size of the biggest
> + * command parameters (+ status if any).
> + * Allocation will be done in this function which
> + * will give back to client in @ipc_buf the virtual
> + * & physical addresses & size of shared IPC buffer.
> + * All the further command data (parameters + status)
> + * have to be written in this shared IPC buffer
> + * virtual memory. This is done to avoid
> + * unnecessary copies of command data.
> + * @ipc_buf: (out) allocated IPC shared buffer
> + * @ipc_buf.size: (out) allocated size
> + * @ipc_buf.vaddr: (out) virtual address where to copy
> + * further command data
> + * @hdl: (out) handle of decoding instance.
> + */
> +
> +int delta_ipc_open(struct delta_ctx *ctx, const char *name,
> + struct delta_ipc_param *param, u32 ipc_buf_size,
> + struct delta_buf **ipc_buf, void **hdl);
> +
> +/*
> + * delta_ipc_set_stream - set information about stream to decoder
> + * @hdl: (in) handle of decoding instance.
> + * @param: (in) set stream command parameters specific to decoder
> + * @param.size: (in) size of parameter
> + * @param.data: (in) virtual address of parameter. Must be
> + * within IPC shared buffer range
> + */
> +int delta_ipc_set_stream(void *hdl, struct delta_ipc_param *param);
> +
> +/*
> + * delta_ipc_decode - frame decoding synchronous request, returns only
> + * after decoding completion on firmware side.
> + * @hdl: (in) handle of decoding instance.
> + * @param: (in) decode command parameters specific to decoder
> + * @param.size: (in) size of parameter
> + * @param.data: (in) virtual address of parameter. Must be
> + * within IPC shared buffer range
> + * @status: (in/out) decode command status specific to decoder
> + * @status.size: (in) size of status
> + * @status.data: (in/out) virtual address of status. Must be
> + * within IPC shared buffer range.
> + * Status is filled by decoding instance
> + * after decoding completion.
> + */
> +int delta_ipc_decode(void *hdl, struct delta_ipc_param *param,
> + struct delta_ipc_param *status);
> +
> +/*
> + * delta_ipc_close - close decoding instance
> + * @hdl: (in) handle of decoding instance to close.
> + */
> +void delta_ipc_close(void *hdl);
> +
> +#endif /* DELTA_IPC_H */
> diff --git a/drivers/media/platform/sti/delta/delta-v4l2.c
> b/drivers/media/platform/sti/delta/delta-v4l2.c
> index e65a3a3..237a938 100644
> --- a/drivers/media/platform/sti/delta/delta-v4l2.c
> +++ b/drivers/media/platform/sti/delta/delta-v4l2.c
> @@ -17,6 +17,7 @@
> #include <media/videobuf2-dma-contig.h>
>
> #include "delta.h"
> +#include "delta-ipc.h"
>
> #define DELTA_NAME "st-delta"
>
> @@ -1703,6 +1704,14 @@ static int delta_probe(struct platform_device *pdev)
> pm_runtime_set_suspended(dev);
> pm_runtime_enable(dev);
>
> + /* init firmware ipc channel */
> + ret = delta_ipc_init(delta);
> + if (ret) {
> + dev_err(delta->dev, "%s failed to initialize firmware ipc
> channel\n",
> + DELTA_PREFIX);
> + goto err;
> + }
> +
> /* register all available decoders */
> register_decoders(delta);
>
> @@ -1747,6 +1756,8 @@ static int delta_remove(struct platform_device *pdev)
> {
> struct delta_dev *delta = platform_get_drvdata(pdev);
>
> + delta_ipc_exit(delta);
> +
> delta_unregister_device(delta);
>
> destroy_workqueue(delta->work_queue);
> diff --git a/drivers/media/platform/sti/delta/delta.h
> b/drivers/media/platform/sti/delta/delta.h
> index 9e26525..d4a401b 100644
> --- a/drivers/media/platform/sti/delta/delta.h
> +++ b/drivers/media/platform/sti/delta/delta.h
> @@ -7,6 +7,7 @@
> #ifndef DELTA_H
> #define DELTA_H
>
> +#include <linux/rpmsg.h>
> #include <media/v4l2-device.h>
> #include <media/v4l2-mem2mem.h>
>
> @@ -199,6 +200,19 @@ struct delta_buf {
> unsigned long attrs;
> };
>
> +struct delta_ipc_ctx {
> + int cb_err;
> + u32 copro_hdl;
> + struct completion done;
> + struct delta_buf ipc_buf_struct;
> + struct delta_buf *ipc_buf;
> +};
> +
> +struct delta_ipc_param {
> + u32 size;
> + void *data;
> +};
> +
> struct delta_ctx;
>
> /*
> @@ -368,6 +382,7 @@ struct delta_dec {
> * @fh: V4L2 file handle
> * @dev: device context
> * @dec: selected decoder context for this instance
> + * @ipc_ctx: context of IPC communication with firmware
> * @state: instance state
> * @frame_num: frame number
> * @au_num: access unit number
> @@ -399,6 +414,8 @@ struct delta_ctx {
> struct v4l2_fh fh;
> struct delta_dev *dev;
> const struct delta_dec *dec;
> + struct delta_ipc_ctx ipc_ctx;
> +
> enum delta_state state;
> u32 frame_num;
> u32 au_num;
> @@ -447,6 +464,8 @@ struct delta_ctx {
> * @nb_of_streamformats:number of supported compressed video formats
> * @instance_id: rolling counter identifying an instance (debug purpose)
> * @work_queue: decoding job work queue
> + * @rpmsg_driver: rpmsg IPC driver
> + * @rpmsg_device: rpmsg IPC device
> */
> struct delta_dev {
> struct v4l2_device v4l2_dev;
> @@ -466,6 +485,8 @@ struct delta_dev {
> u32 nb_of_streamformats;
> u8 instance_id;
> struct workqueue_struct *work_queue;
> + struct rpmsg_driver rpmsg_driver;
> + struct rpmsg_device *rpmsg_device;
> };
>
> static inline char *frame_type_str(u32 flags)
--
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