// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018, NVIDIA CORPORATION.
*/
#include <linux/genalloc.h>
#include <linux/io.h>
#include <linux/mailbox_client.h>
#include <linux/of_address.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;
union {
void __iomem *sram;
void *dram;
};
dma_addr_t phys;
} 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)
{
int err;
err = tegra_ivc_read_get_next_frame(channel->ivc, &channel->ib);
if (err) {
iosys_map_clear(&channel->ib);
return false;
}
return true;
}
static bool tegra186_bpmp_is_channel_free(struct tegra_bpmp_channel *channel)
{
int err;
err = tegra_ivc_write_get_next_frame(channel->ivc, &channel->ob);
if (err) {
iosys_map_clear(&channel->ob);
return false;
}
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;
struct iosys_map rx, tx;
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;
if (priv->rx.pool) {
iosys_map_set_vaddr_iomem(&rx, priv->rx.sram + offset);
iosys_map_set_vaddr_iomem(&tx, priv->tx.sram + offset);
} else {
iosys_map_set_vaddr(&rx, priv->rx.dram + offset);
iosys_map_set_vaddr(&tx, priv->tx.dram + offset);
}
err = tegra_ivc_init(channel->ivc, NULL, &rx, priv->rx.phys + offset, &tx,
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 void tegra186_bpmp_teardown_channels(struct tegra_bpmp *bpmp)
{
struct tegra186_bpmp *priv = bpmp->priv;
unsigned int i;
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);
tegra186_bpmp_channel_cleanup(bpmp->tx_channel);
if (priv->tx.pool) {
gen_pool_free(priv->tx.pool, (unsigned long)priv->tx.sram, 4096);
gen_pool_free(priv->rx.pool, (unsigned long)priv->rx.sram, 4096);
}
}
static int tegra186_bpmp_dram_init(struct tegra_bpmp *bpmp)
{
struct tegra186_bpmp *priv = bpmp->priv;
struct device_node *np;
struct resource res;
size_t size;
int err;
np = of_parse_phandle(bpmp->dev->of_node, "memory-region", 0);
if (!np)
return -ENODEV;
err = of_address_to_resource(np, 0, &res);
if (err < 0) {
dev_warn(bpmp->dev, "failed to parse memory region: %d\n", err);
return err;
}
size = resource_size(&res);
if (size < SZ_8K) {
dev_warn(bpmp->dev, "DRAM region must be larger than 8 KiB\n");
return -EINVAL;
}
priv->tx.phys = res.start;
priv->rx.phys = res.start + SZ_4K;
priv->tx.dram = devm_memremap(bpmp->dev, priv->tx.phys, size,
MEMREMAP_WC);
if (IS_ERR(priv->tx.dram)) {
err = PTR_ERR(priv->tx.dram);
dev_warn(bpmp->dev, "failed to map DRAM region: %d\n", err);
return err;
}
priv->rx.dram = priv->tx.dram + SZ_4K;
return 0;
}
static int tegra186_bpmp_sram_init(struct tegra_bpmp *bpmp)
{
struct tegra186_bpmp *priv = bpmp->priv;
int err;
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.sram = (void __iomem *)gen_pool_dma_alloc(priv->tx.pool, 4096,
&priv->tx.phys);
if (!priv->tx.sram) {
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.sram = (void __iomem *)gen_pool_dma_alloc(priv->rx.pool, 4096,
&priv->rx.phys);
if (!priv->rx.sram) {
dev_err(bpmp->dev, "failed to allocate from RX pool\n");
err = -ENOMEM;
goto free_tx;
}
return 0;
free_tx:
gen_pool_free(priv->tx.pool, (unsigned long)priv->tx.sram, 4096);
return err;
}
static int tegra186_bpmp_setup_channels(struct tegra_bpmp *bpmp)
{
unsigned int i;
int err;
err = tegra186_bpmp_dram_init(bpmp);
if (err == -ENODEV) {
err = tegra186_bpmp_sram_init(bpmp);
if (err < 0)
return err;
}
err = tegra186_bpmp_channel_init(bpmp->tx_channel, bpmp,
bpmp->soc->channels.cpu_tx.offset);
if (err < 0)
return err;
err = tegra186_bpmp_channel_init(bpmp->rx_channel, bpmp,
bpmp->soc->channels.cpu_rx.offset);
if (err < 0) {
tegra186_bpmp_channel_cleanup(bpmp->tx_channel);
return err;
}
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)
break;
}
if (err < 0)
tegra186_bpmp_teardown_channels(bpmp);
return err;
}
static void tegra186_bpmp_reset_channels(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]);
}
static int tegra186_bpmp_init(struct tegra_bpmp *bpmp)
{
struct tegra186_bpmp *priv;
int err;
priv = devm_kzalloc(bpmp->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->parent = bpmp;
bpmp->priv = priv;
err = tegra186_bpmp_setup_channels(bpmp);
if (err < 0)
return err;
/* 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);
tegra186_bpmp_teardown_channels(bpmp);
return err;
}
tegra186_bpmp_reset_channels(bpmp);
return 0;
}
static void tegra186_bpmp_deinit(struct tegra_bpmp *bpmp)
{
struct tegra186_bpmp *priv = bpmp->priv;
mbox_free_channel(priv->mbox.channel);
tegra186_bpmp_teardown_channels(bpmp);
}
static int tegra186_bpmp_resume(struct tegra_bpmp *bpmp)
{
tegra186_bpmp_reset_channels(bpmp);
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,
};
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