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remoteproc: st: add virtio communication support

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This patch provides virtio communication support based on mailbox
for ST co-processors.

Signed-off-by: Loic Pallardy <loic.pallardy@st.com>
Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Loic Pallardy 2017-01-31 13:35:54 +01:00 committed by Bjorn Andersson
parent 3e49ecf6b4
commit 231c8dfd1a
2 changed files with 114 additions and 2 deletions
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3
drivers/remoteproc/Kconfig
View File

@ -118,6 +118,9 @@ config ST_REMOTEPROC
tristate "ST remoteproc support"
depends on ARCH_STI
depends on REMOTEPROC
select MAILBOX
select STI_MBOX
select RPMSG_VIRTIO
help
Say y here to support ST's adjunct processors via the remote
processor framework.

113
drivers/remoteproc/st_remoteproc.c
View File

@ -15,6 +15,7 @@
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mailbox_client.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
@ -25,6 +26,16 @@
#include <linux/remoteproc.h>
#include <linux/reset.h>
#include "remoteproc_internal.h"
#define ST_RPROC_VQ0 0
#define ST_RPROC_VQ1 1
#define ST_RPROC_MAX_VRING 2
#define MBOX_RX 0
#define MBOX_TX 1
#define MBOX_MAX 2
struct st_rproc_config {
bool sw_reset;
bool pwr_reset;
@ -39,8 +50,47 @@ struct st_rproc {
u32 clk_rate;
struct regmap *boot_base;
u32 boot_offset;
struct mbox_chan *mbox_chan[ST_RPROC_MAX_VRING * MBOX_MAX];
struct mbox_client mbox_client_vq0;
struct mbox_client mbox_client_vq1;
};
static void st_rproc_mbox_callback(struct device *dev, u32 msg)
{
struct rproc *rproc = dev_get_drvdata(dev);
if (rproc_vq_interrupt(rproc, msg) == IRQ_NONE)
dev_dbg(dev, "no message was found in vqid %d\n", msg);
}
static
void st_rproc_mbox_callback_vq0(struct mbox_client *mbox_client, void *data)
{
st_rproc_mbox_callback(mbox_client->dev, 0);
}
static
void st_rproc_mbox_callback_vq1(struct mbox_client *mbox_client, void *data)
{
st_rproc_mbox_callback(mbox_client->dev, 1);
}
static void st_rproc_kick(struct rproc *rproc, int vqid)
{
struct st_rproc *ddata = rproc->priv;
struct device *dev = rproc->dev.parent;
int ret;
/* send the index of the triggered virtqueue in the mailbox payload */
if (WARN_ON(vqid >= ST_RPROC_MAX_VRING))
return;
ret = mbox_send_message(ddata->mbox_chan[vqid * MBOX_MAX + MBOX_TX],
(void *)&vqid);
if (ret < 0)
dev_err(dev, "failed to send message via mbox: %d\n", ret);
}
static int st_rproc_start(struct rproc *rproc)
{
struct st_rproc *ddata = rproc->priv;
@ -108,6 +158,7 @@ static int st_rproc_stop(struct rproc *rproc)
}
static const struct rproc_ops st_rproc_ops = {
.kick = st_rproc_kick,
.start = st_rproc_start,
.stop = st_rproc_stop,
};
@ -221,8 +272,9 @@ static int st_rproc_probe(struct platform_device *pdev)
struct st_rproc *ddata;
struct device_node *np = dev->of_node;
struct rproc *rproc;
struct mbox_chan *chan;
int enabled;
int ret;
int ret, i;
match = of_match_device(st_rproc_match, dev);
if (!match || !match->data) {
@ -257,12 +309,65 @@ static int st_rproc_probe(struct platform_device *pdev)
clk_set_rate(ddata->clk, ddata->clk_rate);
}
if (of_get_property(np, "mbox-names", NULL)) {
ddata->mbox_client_vq0.dev = dev;
ddata->mbox_client_vq0.tx_done = NULL;
ddata->mbox_client_vq0.tx_block = false;
ddata->mbox_client_vq0.knows_txdone = false;
ddata->mbox_client_vq0.rx_callback = st_rproc_mbox_callback_vq0;
ddata->mbox_client_vq1.dev = dev;
ddata->mbox_client_vq1.tx_done = NULL;
ddata->mbox_client_vq1.tx_block = false;
ddata->mbox_client_vq1.knows_txdone = false;
ddata->mbox_client_vq1.rx_callback = st_rproc_mbox_callback_vq1;
/*
* To control a co-processor without IPC mechanism.
* This driver can be used without mbox and rpmsg.
*/
chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_rx");
if (IS_ERR(chan)) {
dev_err(&rproc->dev, "failed to request mbox chan 0\n");
ret = PTR_ERR(chan);
goto free_clk;
}
ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_RX] = chan;
chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_tx");
if (IS_ERR(chan)) {
dev_err(&rproc->dev, "failed to request mbox chan 0\n");
ret = PTR_ERR(chan);
goto free_mbox;
}
ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_TX] = chan;
chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_rx");
if (IS_ERR(chan)) {
dev_err(&rproc->dev, "failed to request mbox chan 1\n");
ret = PTR_ERR(chan);
goto free_mbox;
}
ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_RX] = chan;
chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_tx");
if (IS_ERR(chan)) {
dev_err(&rproc->dev, "failed to request mbox chan 1\n");
ret = PTR_ERR(chan);
goto free_mbox;
}
ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_TX] = chan;
}
ret = rproc_add(rproc);
if (ret)
goto free_clk;
goto free_mbox;
return 0;
free_mbox:
for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
mbox_free_channel(ddata->mbox_chan[i]);
free_clk:
clk_unprepare(ddata->clk);
free_rproc:
@ -274,6 +379,7 @@ static int st_rproc_remove(struct platform_device *pdev)
{
struct rproc *rproc = platform_get_drvdata(pdev);
struct st_rproc *ddata = rproc->priv;
int i;
rproc_del(rproc);
@ -281,6 +387,9 @@ static int st_rproc_remove(struct platform_device *pdev)
of_reserved_mem_device_release(&pdev->dev);
for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
mbox_free_channel(ddata->mbox_chan[i]);
rproc_free(rproc);
return 0;