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243 lines
6.0 KiB
243 lines
6.0 KiB
// 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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struct resource *res; |
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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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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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priv->atomics = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(priv->atomics)) |
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return PTR_ERR(priv->atomics); |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
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priv->arb_sema = devm_ioremap_resource(&pdev->dev, res); |
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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 err; |
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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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