drivers/staging/octeon/ethernet-spi.c

Source file repositories/reference/linux-study-clean/drivers/staging/octeon/ethernet-spi.c

File Facts

System
Linux kernel
Corpus path
drivers/staging/octeon/ethernet-spi.c
Extension
.c
Size
6760 bytes
Lines
227
Domain
Driver Families
Bucket
drivers/staging
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 ((priv->port == interface * 16) && need_retrain[interface]) {
			if (cvmx_spi_restart_interface
			    (interface, CVMX_SPI_MODE_DUPLEX, 10) == 0) {
				need_retrain[interface] = 0;
				cvm_oct_spi_enable_error_reporting(interface);
			}
		}

		/*
		 * The SPI4000 TWSI interface is very slow. In order
		 * not to bring the system to a crawl, we only poll a
		 * single port every second. This means negotiation
		 * speed changes take up to 10 seconds, but at least
		 * we don't waste absurd amounts of time waiting for
		 * TWSI.
		 */
		if (priv->port == spi4000_port) {
			/*
			 * This function does nothing if it is called on an
			 * interface without a SPI4000.
			 */
			cvmx_spi4000_check_speed(interface, priv->port);
			/*
			 * Normal ordering increments. By decrementing
			 * we only match once per iteration.
			 */
			spi4000_port--;
			if (spi4000_port < 0)
				spi4000_port = 10;
		}
	}
}

int cvm_oct_spi_init(struct net_device *dev)
{
	int r;
	struct octeon_ethernet *priv = netdev_priv(dev);

	if (number_spi_ports == 0) {
		r = request_irq(OCTEON_IRQ_RML, cvm_oct_spi_rml_interrupt,
				IRQF_SHARED, "SPI", &number_spi_ports);
		if (r)
			return r;
	}
	number_spi_ports++;

	if (priv->port == 0 || priv->port == 16) {
		cvm_oct_spi_enable_error_reporting(INTERFACE(priv->port));
		priv->poll = cvm_oct_spi_poll;
	}
	cvm_oct_common_init(dev);
	return 0;
}

void cvm_oct_spi_uninit(struct net_device *dev)
{
	int interface;

	cvm_oct_common_uninit(dev);
	number_spi_ports--;
	if (number_spi_ports == 0) {
		for (interface = 0; interface < 2; interface++) {
			cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), 0);
			cvmx_write_csr(CVMX_STXX_INT_MSK(interface), 0);
		}
		free_irq(OCTEON_IRQ_RML, &number_spi_ports);
	}
}

Annotation

Implementation Notes