drivers/firmware/tegra/bpmp.c

Source file repositories/reference/linux-study-clean/drivers/firmware/tegra/bpmp.c

File Facts

System
Linux kernel
Corpus path
drivers/firmware/tegra/bpmp.c
Extension
.c
Size
21174 bytes
Lines
942
Domain
Driver Families
Bucket
drivers/firmware
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (tegra_bpmp_is_response_ready(channel)) {
			tegra_bpmp_channel_signal(channel);
			clear_bit(i, busy);
		}
	}

	spin_unlock(&bpmp->lock);
}

static int tegra_bpmp_probe(struct platform_device *pdev)
{
	struct tegra_bpmp *bpmp;
	char tag[TAG_SZ];
	size_t size;
	int err;

	bpmp = devm_kzalloc(&pdev->dev, sizeof(*bpmp), GFP_KERNEL);
	if (!bpmp)
		return -ENOMEM;

	bpmp->soc = of_device_get_match_data(&pdev->dev);
	bpmp->dev = &pdev->dev;

	INIT_LIST_HEAD(&bpmp->mrqs);
	spin_lock_init(&bpmp->lock);

	bpmp->threaded.count = bpmp->soc->channels.thread.count;
	sema_init(&bpmp->threaded.lock, bpmp->threaded.count);

	size = BITS_TO_LONGS(bpmp->threaded.count) * sizeof(long);

	bpmp->threaded.allocated = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
	if (!bpmp->threaded.allocated)
		return -ENOMEM;

	bpmp->threaded.busy = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
	if (!bpmp->threaded.busy)
		return -ENOMEM;

	spin_lock_init(&bpmp->atomic_tx_lock);
	bpmp->tx_channel = devm_kzalloc(&pdev->dev, sizeof(*bpmp->tx_channel),
					GFP_KERNEL);
	if (!bpmp->tx_channel)
		return -ENOMEM;

	bpmp->rx_channel = devm_kzalloc(&pdev->dev, sizeof(*bpmp->rx_channel),
	                                GFP_KERNEL);
	if (!bpmp->rx_channel)
		return -ENOMEM;

	bpmp->threaded_channels = devm_kcalloc(&pdev->dev, bpmp->threaded.count,
					       sizeof(*bpmp->threaded_channels),
					       GFP_KERNEL);
	if (!bpmp->threaded_channels)
		return -ENOMEM;

	platform_set_drvdata(pdev, bpmp);

	err = bpmp->soc->ops->init(bpmp);
	if (err < 0)
		return err;

	err = tegra_bpmp_request_mrq(bpmp, MRQ_PING,
				     tegra_bpmp_mrq_handle_ping, bpmp);
	if (err < 0)
		goto deinit;

	err = tegra_bpmp_ping(bpmp);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to ping BPMP: %d\n", err);
		goto free_mrq;
	}

	err = tegra_bpmp_get_firmware_tag(bpmp, tag, sizeof(tag));
	if (err < 0) {
		dev_err(&pdev->dev, "failed to get firmware tag: %d\n", err);
		goto free_mrq;
	}

	dev_info(&pdev->dev, "firmware: %.*s\n", (int)sizeof(tag), tag);

	err = of_platform_default_populate(pdev->dev.of_node, NULL, &pdev->dev);
	if (err < 0)
		goto free_mrq;

	if (of_property_present(pdev->dev.of_node, "#clock-cells")) {
		err = tegra_bpmp_init_clocks(bpmp);
		if (err < 0)
			goto free_mrq;
	}

Annotation

Implementation Notes