1 files changed, 594 insertions, 0 deletions

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 000000000000..41e4a4c259b3
--- /dev/null
+++ b/drivers/media/platform/sti/delta/delta-ipc.c
@@ -0,0 +1,594 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2015
+ * Author: Hugues Fruchet <hugues.fruchet@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);
+}