drivers/interconnect/qcom/smd-rpm.c

Source file repositories/reference/linux-study-clean/drivers/interconnect/qcom/smd-rpm.c

File Facts

System
Linux kernel
Corpus path
drivers/interconnect/qcom/smd-rpm.c
Extension
.c
Size
2187 bytes
Lines
94
Domain
Driver Families
Bucket
drivers/interconnect
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

struct icc_rpm_smd_req {
	__le32 key;
	__le32 nbytes;
	__le32 value;
};

bool qcom_icc_rpm_smd_available(void)
{
	return !!icc_smd_rpm;
}
EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_available);

int qcom_icc_rpm_smd_send(int ctx, int rsc_type, int id, u32 val)
{
	struct icc_rpm_smd_req req = {
		.key = cpu_to_le32(RPM_KEY_BW),
		.nbytes = cpu_to_le32(sizeof(u32)),
		.value = cpu_to_le32(val),
	};

	return qcom_rpm_smd_write(icc_smd_rpm, ctx, rsc_type, id, &req,
				  sizeof(req));
}
EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_send);

int qcom_icc_rpm_set_bus_rate(const struct rpm_clk_resource *clk, int ctx, u32 rate)
{
	struct clk_smd_rpm_req req = {
		.key = cpu_to_le32(QCOM_RPM_SMD_KEY_RATE),
		.nbytes = cpu_to_le32(sizeof(u32)),
	};

	/* Branch clocks are only on/off */
	if (clk->branch)
		rate = !!rate;

	req.value = cpu_to_le32(rate);
	return qcom_rpm_smd_write(icc_smd_rpm,
				  ctx,
				  clk->resource_type,
				  clk->clock_id,
				  &req, sizeof(req));
}
EXPORT_SYMBOL_GPL(qcom_icc_rpm_set_bus_rate);

static void qcom_icc_rpm_smd_remove(struct platform_device *pdev)
{
	icc_smd_rpm = NULL;
}

static int qcom_icc_rpm_smd_probe(struct platform_device *pdev)
{
	icc_smd_rpm = dev_get_drvdata(pdev->dev.parent);

	if (!icc_smd_rpm) {
		dev_err(&pdev->dev, "unable to retrieve handle to RPM\n");
		return -ENODEV;
	}

	return 0;
}

static struct platform_driver qcom_interconnect_rpm_smd_driver = {
	.driver = {
		.name		= "icc_smd_rpm",
	},
	.probe = qcom_icc_rpm_smd_probe,
	.remove = qcom_icc_rpm_smd_remove,
};
module_platform_driver(qcom_interconnect_rpm_smd_driver);
MODULE_AUTHOR("Georgi Djakov <georgi.djakov@linaro.org>");
MODULE_DESCRIPTION("Qualcomm SMD RPM interconnect proxy driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:icc_smd_rpm");

Annotation

Implementation Notes