[PATCH V2 7/7] remoteproc: imx_proc: enable virtio/mailbox

Peng Fan
2020-09-27T06:16:01Z

Use virtio/mailbox to build connection between Remote Proccessors
and Linux. Add delayed work to handle incoming messages.

Reviewed-by: Richard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
drivers/remoteproc/imx_rproc.c | 112 ++++++++++++++++++++++++++++++++-
1 file changed, 109 insertions(+), 3 deletions(-)

diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
index 0f69f3f745ab..c514d7ca7c81 100644
--- a/drivers/remoteproc/imx_rproc.c
+++ b/drivers/remoteproc/imx_rproc.c
@@ -8,6 +8,7 @@
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
+#include <linux/mailbox_client.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_address.h>
@@ -17,6 +18,8 @@
#include <linux/regmap.h>
#include <linux/remoteproc.h>

+#include "remoteproc_internal.h"
+
#define IMX7D_SRC_SCR 0x0C
#define IMX7D_ENABLE_M4 BIT(3)
#define IMX7D_SW_M4P_RST BIT(2)
@@ -88,6 +91,10 @@ struct imx_rproc {
const struct imx_rproc_dcfg *dcfg;
struct imx_rproc_mem mem[IMX7D_RPROC_MEM_MAX];
struct clk *clk;
+ struct mbox_client cl;
+ struct mbox_chan *tx_ch;
+ struct mbox_chan *rx_ch;
+ struct delayed_work rproc_work;
};

static const struct imx_rproc_att imx_rproc_att_imx8mq[] = {
@@ -373,9 +380,30 @@ 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;
+ }
+
+ mmsg = vqid << 16;
+
+ priv->cl.tx_tout = 100;
+ err = mbox_send_message(priv->tx_ch, (void *)&mmsg);
+ 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,
@@ -458,6 +486,70 @@ static void imx_rproc_memset(struct rproc *rproc, void *s, int c, size_t count)
memset_io((void * __iomem)s, c, count);
}

+static void imx_rproc_vq_work(struct work_struct *work)
+{
+ struct delayed_work *dwork = to_delayed_work(work);
+ struct imx_rproc *priv = container_of(dwork, 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;
+
+ schedule_delayed_work(&(priv->rproc_work), 0);
+}
+
+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 = 0;
+
+ if (!of_get_property(dev->of_node, "mbox-names", NULL))
+ return 0;
+
+ cl = &priv->cl;
+ cl->dev = dev;
+ cl->tx_block = true;
+ cl->tx_tout = 20;
+ 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)) {
+ if (PTR_ERR(priv->tx_ch) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ ret = PTR_ERR(priv->tx_ch);
+ dev_dbg(cl->dev, "failed to request mbox tx chan, ret %d\n",
+ ret);
+ goto err_out;
+ }
+
+ priv->rx_ch = mbox_request_channel_byname(cl, "rx");
+ if (IS_ERR(priv->rx_ch)) {
+ ret = PTR_ERR(priv->rx_ch);
+ dev_dbg(cl->dev, "failed to request mbox rx chan, ret %d\n",
+ ret);
+ goto err_out;
+ }
+
+ return ret;
+
+err_out:
+ if (!IS_ERR(priv->tx_ch))
+ mbox_free_channel(priv->tx_ch);
+ if (!IS_ERR(priv->rx_ch))
+ mbox_free_channel(priv->rx_ch);
+
+ return ret;
+}
+
static int imx_rproc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -501,17 +593,24 @@ static int imx_rproc_probe(struct platform_device *pdev)

dev_set_drvdata(dev, rproc);

+ ret = imx_rproc_xtr_mbox_init(rproc);
+ if (ret) {
+ if (ret == -EPROBE_DEFER)
+ goto err_put_rproc;
+ /* mbox is optional, so not fail here */
+ }
+
ret = imx_rproc_addr_init(priv, pdev);
if (ret) {
dev_err(dev, "failed on imx_rproc_addr_init\n");
- goto err_put_rproc;
+ goto err_put_mbox;
}

priv->clk = devm_clk_get(dev, NULL);
if (IS_ERR(priv->clk)) {
dev_err(dev, "Failed to get clock\n");
ret = PTR_ERR(priv->clk);
- goto err_put_rproc;
+ goto err_put_mbox;
}

/*
@@ -521,9 +620,11 @@ static int imx_rproc_probe(struct platform_device *pdev)
ret = clk_prepare_enable(priv->clk);
if (ret) {
dev_err(&rproc->dev, "Failed to enable clock\n");
- goto err_put_rproc;
+ goto err_put_mbox;
}

+ INIT_DELAYED_WORK(&(priv->rproc_work), imx_rproc_vq_work);
+
ret = rproc_add(rproc);
if (ret) {
dev_err(dev, "rproc_add failed\n");
@@ -534,6 +635,11 @@ static int imx_rproc_probe(struct platform_device *pdev)

err_put_clk:
clk_disable_unprepare(priv->clk);
+err_put_mbox:
+ if (!IS_ERR(priv->tx_ch))
+ mbox_free_channel(priv->tx_ch);
+ if (!IS_ERR(priv->rx_ch))
+ mbox_free_channel(priv->rx_ch);
err_put_rproc:
rproc_free(rproc);

--
2.28.0