diff options
Diffstat (limited to 'drivers/firmware/tegra/bpmp-tegra210.c')
| -rw-r--r-- | drivers/firmware/tegra/bpmp-tegra210.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/drivers/firmware/tegra/bpmp-tegra210.c b/drivers/firmware/tegra/bpmp-tegra210.c new file mode 100644 index 000000000000..ae15940a078e --- /dev/null +++ b/drivers/firmware/tegra/bpmp-tegra210.c @@ -0,0 +1,243 @@ +// 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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