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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018, NVIDIA CORPORATION.
*/
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <soc/tegra/bpmp.h>
#include "bpmp-private.h"
#define TRIGGER_OFFSET 0x000
#define RESULT_OFFSET(id) (0xc00 + id * 4)
#define TRIGGER_ID_SHIFT 16
#define TRIGGER_CMD_GET 4
#define STA_OFFSET 0
#define SET_OFFSET 4
#define CLR_OFFSET 8
#define CH_MASK(ch) (0x3 << ((ch) * 2))
#define SL_SIGL(ch) (0x0 << ((ch) * 2))
#define SL_QUED(ch) (0x1 << ((ch) * 2))
#define MA_FREE(ch) (0x2 << ((ch) * 2))
#define MA_ACKD(ch) (0x3 << ((ch) * 2))
struct tegra210_bpmp {
void __iomem *atomics;
void __iomem *arb_sema;
struct irq_data *tx_irq_data;
};
static u32 bpmp_channel_status(struct tegra_bpmp *bpmp, unsigned int index)
{
struct tegra210_bpmp *priv = bpmp->priv;
return __raw_readl(priv->arb_sema + STA_OFFSET) & CH_MASK(index);
}
static bool tegra210_bpmp_is_response_ready(struct tegra_bpmp_channel *channel)
{
unsigned int index = channel->index;
return bpmp_channel_status(channel->bpmp, index) == MA_ACKD(index);
}
static bool tegra210_bpmp_is_request_ready(struct tegra_bpmp_channel *channel)
{
unsigned int index = channel->index;
return bpmp_channel_status(channel->bpmp, index) == SL_SIGL(index);
}
static bool
tegra210_bpmp_is_request_channel_free(struct tegra_bpmp_channel *channel)
{
unsigned int index = channel->index;
return bpmp_channel_status(channel->bpmp, index) == MA_FREE(index);
}
static bool
tegra210_bpmp_is_response_channel_free(struct tegra_bpmp_channel *channel)
{
unsigned int index = channel->index;
return bpmp_channel_status(channel->bpmp, index) == SL_QUED(index);
}
static int tegra210_bpmp_post_request(struct tegra_bpmp_channel *channel)
{
struct tegra210_bpmp *priv = channel->bpmp->priv;
__raw_writel(CH_MASK(channel->index), priv->arb_sema + CLR_OFFSET);
return 0;
}
static int tegra210_bpmp_post_response(struct tegra_bpmp_channel *channel)
{
struct tegra210_bpmp *priv = channel->bpmp->priv;
__raw_writel(MA_ACKD(channel->index), priv->arb_sema + SET_OFFSET);
return 0;
}
static int tegra210_bpmp_ack_response(struct tegra_bpmp_channel *channel)
{
struct tegra210_bpmp *priv = channel->bpmp->priv;
__raw_writel(MA_ACKD(channel->index) ^ MA_FREE(channel->index),
priv->arb_sema + CLR_OFFSET);
return 0;
}
static int tegra210_bpmp_ack_request(struct tegra_bpmp_channel *channel)
{
struct tegra210_bpmp *priv = channel->bpmp->priv;
__raw_writel(SL_QUED(channel->index), priv->arb_sema + SET_OFFSET);
return 0;
}
static int tegra210_bpmp_ring_doorbell(struct tegra_bpmp *bpmp)
{
struct tegra210_bpmp *priv = bpmp->priv;
struct irq_data *irq_data = priv->tx_irq_data;
/*
* Tegra Legacy Interrupt Controller (LIC) is used to notify BPMP of
* available messages
*/
if (irq_data->chip->irq_retrigger)
return irq_data->chip->irq_retrigger(irq_data);
return -EINVAL;
}
static irqreturn_t rx_irq(int irq, void *data)
{
struct tegra_bpmp *bpmp = data;
tegra_bpmp_handle_rx(bpmp);
return IRQ_HANDLED;
}
static int tegra210_bpmp_channel_init(struct tegra_bpmp_channel *channel,
struct tegra_bpmp *bpmp,
unsigned int index)
{
struct tegra210_bpmp *priv = bpmp->priv;
u32 address;
void *p;
/* Retrieve channel base address from BPMP */
writel(index << TRIGGER_ID_SHIFT | TRIGGER_CMD_GET,
priv->atomics + TRIGGER_OFFSET);
address = readl(priv->atomics + RESULT_OFFSET(index));
p = devm_ioremap(bpmp->dev, address, 0x80);
if (!p)
return -ENOMEM;
channel->ib = p;
channel->ob = p;
channel->index = index;
init_completion(&channel->completion);
channel->bpmp = bpmp;
return 0;
}
static int tegra210_bpmp_init(struct tegra_bpmp *bpmp)
{
struct platform_device *pdev = to_platform_device(bpmp->dev);
struct tegra210_bpmp *priv;
struct resource *res;
unsigned int i;
int err;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
bpmp->priv = priv;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->atomics = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->atomics))
return PTR_ERR(priv->atomics);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
priv->arb_sema = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->arb_sema))
return PTR_ERR(priv->arb_sema);
err = tegra210_bpmp_channel_init(bpmp->tx_channel, bpmp,
bpmp->soc->channels.cpu_tx.offset);
if (err < 0)
return err;
err = tegra210_bpmp_channel_init(bpmp->rx_channel, bpmp,
bpmp->soc->channels.cpu_rx.offset);
if (err < 0)
return err;
for (i = 0; i < bpmp->threaded.count; i++) {
unsigned int index = bpmp->soc->channels.thread.offset + i;
err = tegra210_bpmp_channel_init(&bpmp->threaded_channels[i],
bpmp, index);
if (err < 0)
return err;
}
err = platform_get_irq_byname(pdev, "tx");
if (err < 0) {
dev_err(&pdev->dev, "failed to get TX IRQ: %d\n", err);
return err;
}
priv->tx_irq_data = irq_get_irq_data(err);
if (!priv->tx_irq_data) {
dev_err(&pdev->dev, "failed to get IRQ data for TX IRQ\n");
return err;
}
err = platform_get_irq_byname(pdev, "rx");
if (err < 0) {
dev_err(&pdev->dev, "failed to get rx IRQ: %d\n", err);
return err;
}
err = devm_request_irq(&pdev->dev, err, rx_irq,
IRQF_NO_SUSPEND, dev_name(&pdev->dev), bpmp);
if (err < 0) {
dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
return err;
}
return 0;
}
const struct tegra_bpmp_ops tegra210_bpmp_ops = {
.init = tegra210_bpmp_init,
.is_response_ready = tegra210_bpmp_is_response_ready,
.is_request_ready = tegra210_bpmp_is_request_ready,
.ack_response = tegra210_bpmp_ack_response,
.ack_request = tegra210_bpmp_ack_request,
.is_response_channel_free = tegra210_bpmp_is_response_channel_free,
.is_request_channel_free = tegra210_bpmp_is_request_channel_free,
.post_response = tegra210_bpmp_post_response,
.post_request = tegra210_bpmp_post_request,
.ring_doorbell = tegra210_bpmp_ring_doorbell,
};
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