drivers/memory/tegra/tegra210-emc-table.c

Source file repositories/reference/linux-study-clean/drivers/memory/tegra/tegra210-emc-table.c

File Facts

System
Linux kernel
Corpus path
drivers/memory/tegra/tegra210-emc-table.c
Extension
.c
Size
2116 bytes
Lines
90
Domain
Driver Families
Bucket
drivers/memory
Inferred role
Driver Families: implementation source
Status
source 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 (count != emc->num_timings) {
			dev_warn(dev, "%u derated vs. %u nominal entries\n",
				 count, emc->num_timings);
			memunmap(timings);
			return -EINVAL;
		}

		emc->derated = timings;
	} else {
		emc->num_timings = count;
		emc->nominal = timings;
	}

out:
	/* keep track of which table this is */
	rmem->priv = timings;

	return 0;
}

static void tegra210_emc_table_device_release(struct reserved_mem *rmem,
					      struct device *dev)
{
	struct tegra210_emc_timing *timings = rmem->priv;
	struct tegra210_emc *emc = dev_get_drvdata(dev);

	if ((emc->nominal && timings != emc->nominal) &&
	    (emc->derated && timings != emc->derated))
		dev_warn(dev, "trying to release unassigned EMC table '%s'\n",
			 rmem->name);

	memunmap(timings);
}

static int tegra210_emc_table_init(unsigned long node,
				   struct reserved_mem *rmem)
{
	pr_debug("Tegra210 EMC table at %pa, size %lu bytes\n", &rmem->base,
		 (unsigned long)rmem->size);

	return 0;
}

static const struct reserved_mem_ops tegra210_emc_table_ops = {
	.node_init = tegra210_emc_table_init,
	.device_init = tegra210_emc_table_device_init,
	.device_release = tegra210_emc_table_device_release,
};

RESERVEDMEM_OF_DECLARE(tegra210_emc_table, "nvidia,tegra210-emc-table",
		       &tegra210_emc_table_ops);

Annotation

Implementation Notes