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