On Tue, Jan 12, 2021 at 05:39:19PM +0800, peng@nxp.com wrote:
> From: Peng Fan
>
> Use virtio/mailbox to build connection between Remote Proccessors
> and Linux. Add work queue to handle incoming messages.
>
> Reviewed-by: Richard Zhu
> Signed-off-by: Peng Fan
> ---
> drivers/remoteproc/imx_rproc.c | 115 -
> 1 file changed, 112 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index e62a53ee128e..812b077f1282 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -7,6 +7,7 @@
> #include
> #include
> #include
> +#include
> #include
> #include
> #include
> @@ -15,6 +16,9 @@
> #include
> #include
> #include
> +#include
> +
> +#include "remoteproc_internal.h"
>
> #define IMX7D_SRC_SCR0x0C
> #define IMX7D_ENABLE_M4 BIT(3)
> @@ -86,6 +90,11 @@ struct imx_rproc {
> const struct imx_rproc_dcfg *dcfg;
> struct imx_rproc_memmem[IMX7D_RPROC_MEM_MAX];
> struct clk *clk;
> + struct mbox_client cl;
> + struct mbox_chan*tx_ch;
> + struct mbox_chan*rx_ch;
> + struct work_struct rproc_work;
> + struct workqueue_struct *workqueue;
> };
>
> static const struct imx_rproc_att imx_rproc_att_imx8mq[] = {
> @@ -366,9 +375,33 @@ static int imx_rproc_parse_fw(struct rproc *rproc, const
> struct firmware *fw)
> return 0;
> }
>
> +static void imx_rproc_kick(struct rproc *rproc, int vqid)
> +{
> + struct imx_rproc *priv = rproc->priv;
> + int err;
> + __u32 mmsg;
> +
> + if (!priv->tx_ch) {
> + dev_err(priv->dev, "No initialized mbox tx channel\n");
> + return;
> + }
> +
> + /*
> + * Send the index of the triggered virtqueue as the mu payload.
> + * Let remote processor know which virtqueue is used.
> + */
> + mmsg = vqid << 16;
> +
> + err = mbox_send_message(priv->tx_ch, (void *));
> + if (err < 0)
> + dev_err(priv->dev, "%s: failed (%d, err:%d)\n",
> + __func__, vqid, err);
> +}
> +
> static const struct rproc_ops imx_rproc_ops = {
> .start = imx_rproc_start,
> .stop = imx_rproc_stop,
> + .kick = imx_rproc_kick,
> .da_to_va = imx_rproc_da_to_va,
> .load = rproc_elf_load_segments,
> .parse_fw = imx_rproc_parse_fw,
> @@ -444,6 +477,65 @@ static int imx_rproc_addr_init(struct imx_rproc *priv,
> return 0;
> }
>
> +static void imx_rproc_vq_work(struct work_struct *work)
> +{
> + struct imx_rproc *priv = container_of(work, struct imx_rproc,
> + rproc_work);
> +
> + rproc_vq_interrupt(priv->rproc, 0);
> + rproc_vq_interrupt(priv->rproc, 1);
> +}
> +
> +static void imx_rproc_rx_callback(struct mbox_client *cl, void *msg)
> +{
> + struct rproc *rproc = dev_get_drvdata(cl->dev);
> + struct imx_rproc *priv = rproc->priv;
> +
> + queue_work(priv->workqueue, >rproc_work);
> +}
> +
> +static int imx_rproc_xtr_mbox_init(struct rproc *rproc)
> +{
> + struct imx_rproc *priv = rproc->priv;
> + struct device *dev = priv->dev;
> + struct mbox_client *cl;
> + int ret;
> +
> + if (!of_get_property(dev->of_node, "mbox-names", NULL))
> + return 0;
> +
> + cl = >cl;
> + cl->dev = dev;
> + cl->tx_block = true;
> + cl->tx_tout = 100;
> + cl->knows_txdone = false;
> + cl->rx_callback = imx_rproc_rx_callback;
> +
> + priv->tx_ch = mbox_request_channel_byname(cl, "tx");
> + if (IS_ERR(priv->tx_ch)) {
> + ret = PTR_ERR(priv->tx_ch);
> + return dev_err_probe(cl->dev, PTR_ERR(priv->tx_ch),
> + "failed to request tx mailbox channel:
> %d\n", ret);
return dev_err_probe(cl->dev, ret,
"failed to request tx mailbox channel:
%d\n", ret);
> + }
> +
> + priv->rx_ch = mbox_request_channel_byname(cl, "rx");
> + if (IS_ERR(priv->rx_ch)) {
> + mbox_free_channel(priv->tx_ch);
> + return dev_err_probe(cl->dev, PTR_ERR(priv->rx_ch),
> + "failed to request mbox tx chan\n");
ret = PTR_ERR(priv->rx_ch);
return dev_err_probe(cl->dev, ret,
"failed to request rx mailbox channel:
%d\n", ret);
> + }
> +
> + return 0;
> +}
> +
> +static void imx_rproc_free_mbox(struct rproc *rproc)
> +{
> + struct imx_rproc *priv = rproc->priv;
> +
> + mbox_free_channel(priv->tx_ch);
> + mbox_free_channel(priv->rx_ch);
> +}
> +
> static int imx_rproc_probe(struct platform_device *pdev)
> {
> struct device *dev = >dev;
> @@ -481,18 +573,28 @@
