mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Jon Hunter](/assets/img/avatar_default.png)
Since commit 93d2e4322a
("of: platform: Batch fwnode parsing when
adding all top level devices") was added, the probing of the Tegra
SRAM device has occurred later in the boot sequence, after the BPMP
has been probed. The BPMP uses sections of the SRAM for shared memory
and if the BPMP is probed before the SRAM then it fails to probe and
never tries again. This is causing a boot failure on Tegra186 and
Tegra194. Fix this by allowing the probe of the BPMP to be deferred if
the SRAM is not available yet.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
305 lines
7.2 KiB
C
305 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2018, NVIDIA CORPORATION.
|
|
*/
|
|
|
|
#include <linux/genalloc.h>
|
|
#include <linux/mailbox_client.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <soc/tegra/bpmp.h>
|
|
#include <soc/tegra/bpmp-abi.h>
|
|
#include <soc/tegra/ivc.h>
|
|
|
|
#include "bpmp-private.h"
|
|
|
|
struct tegra186_bpmp {
|
|
struct tegra_bpmp *parent;
|
|
|
|
struct {
|
|
struct gen_pool *pool;
|
|
dma_addr_t phys;
|
|
void *virt;
|
|
} tx, rx;
|
|
|
|
struct {
|
|
struct mbox_client client;
|
|
struct mbox_chan *channel;
|
|
} mbox;
|
|
};
|
|
|
|
static inline struct tegra_bpmp *
|
|
mbox_client_to_bpmp(struct mbox_client *client)
|
|
{
|
|
struct tegra186_bpmp *priv;
|
|
|
|
priv = container_of(client, struct tegra186_bpmp, mbox.client);
|
|
|
|
return priv->parent;
|
|
}
|
|
|
|
static bool tegra186_bpmp_is_message_ready(struct tegra_bpmp_channel *channel)
|
|
{
|
|
void *frame;
|
|
|
|
frame = tegra_ivc_read_get_next_frame(channel->ivc);
|
|
if (IS_ERR(frame)) {
|
|
channel->ib = NULL;
|
|
return false;
|
|
}
|
|
|
|
channel->ib = frame;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool tegra186_bpmp_is_channel_free(struct tegra_bpmp_channel *channel)
|
|
{
|
|
void *frame;
|
|
|
|
frame = tegra_ivc_write_get_next_frame(channel->ivc);
|
|
if (IS_ERR(frame)) {
|
|
channel->ob = NULL;
|
|
return false;
|
|
}
|
|
|
|
channel->ob = frame;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int tegra186_bpmp_ack_message(struct tegra_bpmp_channel *channel)
|
|
{
|
|
return tegra_ivc_read_advance(channel->ivc);
|
|
}
|
|
|
|
static int tegra186_bpmp_post_message(struct tegra_bpmp_channel *channel)
|
|
{
|
|
return tegra_ivc_write_advance(channel->ivc);
|
|
}
|
|
|
|
static int tegra186_bpmp_ring_doorbell(struct tegra_bpmp *bpmp)
|
|
{
|
|
struct tegra186_bpmp *priv = bpmp->priv;
|
|
int err;
|
|
|
|
err = mbox_send_message(priv->mbox.channel, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
mbox_client_txdone(priv->mbox.channel, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tegra186_bpmp_ivc_notify(struct tegra_ivc *ivc, void *data)
|
|
{
|
|
struct tegra_bpmp *bpmp = data;
|
|
struct tegra186_bpmp *priv = bpmp->priv;
|
|
|
|
if (WARN_ON(priv->mbox.channel == NULL))
|
|
return;
|
|
|
|
tegra186_bpmp_ring_doorbell(bpmp);
|
|
}
|
|
|
|
static int tegra186_bpmp_channel_init(struct tegra_bpmp_channel *channel,
|
|
struct tegra_bpmp *bpmp,
|
|
unsigned int index)
|
|
{
|
|
struct tegra186_bpmp *priv = bpmp->priv;
|
|
size_t message_size, queue_size;
|
|
unsigned int offset;
|
|
int err;
|
|
|
|
channel->ivc = devm_kzalloc(bpmp->dev, sizeof(*channel->ivc),
|
|
GFP_KERNEL);
|
|
if (!channel->ivc)
|
|
return -ENOMEM;
|
|
|
|
message_size = tegra_ivc_align(MSG_MIN_SZ);
|
|
queue_size = tegra_ivc_total_queue_size(message_size);
|
|
offset = queue_size * index;
|
|
|
|
err = tegra_ivc_init(channel->ivc, NULL,
|
|
priv->rx.virt + offset, priv->rx.phys + offset,
|
|
priv->tx.virt + offset, priv->tx.phys + offset,
|
|
1, message_size, tegra186_bpmp_ivc_notify,
|
|
bpmp);
|
|
if (err < 0) {
|
|
dev_err(bpmp->dev, "failed to setup IVC for channel %u: %d\n",
|
|
index, err);
|
|
return err;
|
|
}
|
|
|
|
init_completion(&channel->completion);
|
|
channel->bpmp = bpmp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tegra186_bpmp_channel_reset(struct tegra_bpmp_channel *channel)
|
|
{
|
|
/* reset the channel state */
|
|
tegra_ivc_reset(channel->ivc);
|
|
|
|
/* sync the channel state with BPMP */
|
|
while (tegra_ivc_notified(channel->ivc))
|
|
;
|
|
}
|
|
|
|
static void tegra186_bpmp_channel_cleanup(struct tegra_bpmp_channel *channel)
|
|
{
|
|
tegra_ivc_cleanup(channel->ivc);
|
|
}
|
|
|
|
static void mbox_handle_rx(struct mbox_client *client, void *data)
|
|
{
|
|
struct tegra_bpmp *bpmp = mbox_client_to_bpmp(client);
|
|
|
|
tegra_bpmp_handle_rx(bpmp);
|
|
}
|
|
|
|
static int tegra186_bpmp_init(struct tegra_bpmp *bpmp)
|
|
{
|
|
struct tegra186_bpmp *priv;
|
|
unsigned int i;
|
|
int err;
|
|
|
|
priv = devm_kzalloc(bpmp->dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
bpmp->priv = priv;
|
|
priv->parent = bpmp;
|
|
|
|
priv->tx.pool = of_gen_pool_get(bpmp->dev->of_node, "shmem", 0);
|
|
if (!priv->tx.pool) {
|
|
dev_err(bpmp->dev, "TX shmem pool not found\n");
|
|
return -EPROBE_DEFER;
|
|
}
|
|
|
|
priv->tx.virt = gen_pool_dma_alloc(priv->tx.pool, 4096, &priv->tx.phys);
|
|
if (!priv->tx.virt) {
|
|
dev_err(bpmp->dev, "failed to allocate from TX pool\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
priv->rx.pool = of_gen_pool_get(bpmp->dev->of_node, "shmem", 1);
|
|
if (!priv->rx.pool) {
|
|
dev_err(bpmp->dev, "RX shmem pool not found\n");
|
|
err = -EPROBE_DEFER;
|
|
goto free_tx;
|
|
}
|
|
|
|
priv->rx.virt = gen_pool_dma_alloc(priv->rx.pool, 4096, &priv->rx.phys);
|
|
if (!priv->rx.virt) {
|
|
dev_err(bpmp->dev, "failed to allocate from RX pool\n");
|
|
err = -ENOMEM;
|
|
goto free_tx;
|
|
}
|
|
|
|
err = tegra186_bpmp_channel_init(bpmp->tx_channel, bpmp,
|
|
bpmp->soc->channels.cpu_tx.offset);
|
|
if (err < 0)
|
|
goto free_rx;
|
|
|
|
err = tegra186_bpmp_channel_init(bpmp->rx_channel, bpmp,
|
|
bpmp->soc->channels.cpu_rx.offset);
|
|
if (err < 0)
|
|
goto cleanup_tx_channel;
|
|
|
|
for (i = 0; i < bpmp->threaded.count; i++) {
|
|
unsigned int index = bpmp->soc->channels.thread.offset + i;
|
|
|
|
err = tegra186_bpmp_channel_init(&bpmp->threaded_channels[i],
|
|
bpmp, index);
|
|
if (err < 0)
|
|
goto cleanup_channels;
|
|
}
|
|
|
|
/* mbox registration */
|
|
priv->mbox.client.dev = bpmp->dev;
|
|
priv->mbox.client.rx_callback = mbox_handle_rx;
|
|
priv->mbox.client.tx_block = false;
|
|
priv->mbox.client.knows_txdone = false;
|
|
|
|
priv->mbox.channel = mbox_request_channel(&priv->mbox.client, 0);
|
|
if (IS_ERR(priv->mbox.channel)) {
|
|
err = PTR_ERR(priv->mbox.channel);
|
|
dev_err(bpmp->dev, "failed to get HSP mailbox: %d\n", err);
|
|
goto cleanup_channels;
|
|
}
|
|
|
|
tegra186_bpmp_channel_reset(bpmp->tx_channel);
|
|
tegra186_bpmp_channel_reset(bpmp->rx_channel);
|
|
|
|
for (i = 0; i < bpmp->threaded.count; i++)
|
|
tegra186_bpmp_channel_reset(&bpmp->threaded_channels[i]);
|
|
|
|
return 0;
|
|
|
|
cleanup_channels:
|
|
for (i = 0; i < bpmp->threaded.count; i++) {
|
|
if (!bpmp->threaded_channels[i].bpmp)
|
|
continue;
|
|
|
|
tegra186_bpmp_channel_cleanup(&bpmp->threaded_channels[i]);
|
|
}
|
|
|
|
tegra186_bpmp_channel_cleanup(bpmp->rx_channel);
|
|
cleanup_tx_channel:
|
|
tegra186_bpmp_channel_cleanup(bpmp->tx_channel);
|
|
free_rx:
|
|
gen_pool_free(priv->rx.pool, (unsigned long)priv->rx.virt, 4096);
|
|
free_tx:
|
|
gen_pool_free(priv->tx.pool, (unsigned long)priv->tx.virt, 4096);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void tegra186_bpmp_deinit(struct tegra_bpmp *bpmp)
|
|
{
|
|
struct tegra186_bpmp *priv = bpmp->priv;
|
|
unsigned int i;
|
|
|
|
mbox_free_channel(priv->mbox.channel);
|
|
|
|
for (i = 0; i < bpmp->threaded.count; i++)
|
|
tegra186_bpmp_channel_cleanup(&bpmp->threaded_channels[i]);
|
|
|
|
tegra186_bpmp_channel_cleanup(bpmp->rx_channel);
|
|
tegra186_bpmp_channel_cleanup(bpmp->tx_channel);
|
|
|
|
gen_pool_free(priv->rx.pool, (unsigned long)priv->rx.virt, 4096);
|
|
gen_pool_free(priv->tx.pool, (unsigned long)priv->tx.virt, 4096);
|
|
}
|
|
|
|
static int tegra186_bpmp_resume(struct tegra_bpmp *bpmp)
|
|
{
|
|
unsigned int i;
|
|
|
|
/* reset message channels */
|
|
tegra186_bpmp_channel_reset(bpmp->tx_channel);
|
|
tegra186_bpmp_channel_reset(bpmp->rx_channel);
|
|
|
|
for (i = 0; i < bpmp->threaded.count; i++)
|
|
tegra186_bpmp_channel_reset(&bpmp->threaded_channels[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct tegra_bpmp_ops tegra186_bpmp_ops = {
|
|
.init = tegra186_bpmp_init,
|
|
.deinit = tegra186_bpmp_deinit,
|
|
.is_response_ready = tegra186_bpmp_is_message_ready,
|
|
.is_request_ready = tegra186_bpmp_is_message_ready,
|
|
.ack_response = tegra186_bpmp_ack_message,
|
|
.ack_request = tegra186_bpmp_ack_message,
|
|
.is_response_channel_free = tegra186_bpmp_is_channel_free,
|
|
.is_request_channel_free = tegra186_bpmp_is_channel_free,
|
|
.post_response = tegra186_bpmp_post_message,
|
|
.post_request = tegra186_bpmp_post_message,
|
|
.ring_doorbell = tegra186_bpmp_ring_doorbell,
|
|
.resume = tegra186_bpmp_resume,
|
|
};
|