arch/mips/cavium-octeon/executive/cvmx-helper-npi.c

Source file repositories/reference/linux-study-clean/arch/mips/cavium-octeon/executive/cvmx-helper-npi.c

File Facts

System
Linux kernel
Corpus path
arch/mips/cavium-octeon/executive/cvmx-helper-npi.c
Extension
.c
Size
3131 bytes
Lines
102
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <asm/octeon/octeon.h>

#include <asm/octeon/cvmx-config.h>

#include <asm/octeon/cvmx-helper.h>

#include <asm/octeon/cvmx-pip-defs.h>

/**
 * Probe a NPI interface and determine the number of ports
 * connected to it. The NPI interface should still be down
 * after this call.
 *
 * @interface: Interface to probe
 *
 * Returns Number of ports on the interface. Zero to disable.
 */
int __cvmx_helper_npi_probe(int interface)
{
#if CVMX_PKO_QUEUES_PER_PORT_PCI > 0
	if (OCTEON_IS_MODEL(OCTEON_CN38XX) || OCTEON_IS_MODEL(OCTEON_CN58XX))
		return 4;
	else if (OCTEON_IS_MODEL(OCTEON_CN56XX)
		 && !OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X))
		/* The packet engines didn't exist before pass 2 */
		return 4;
	else if (OCTEON_IS_MODEL(OCTEON_CN52XX)
		 && !OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X))
		/* The packet engines didn't exist before pass 2 */
		return 4;
#endif
	return 0;
}

/**
 * Bringup and enable a NPI interface. After this call packet
 * I/O should be fully functional. This is called with IPD
 * enabled but PKO disabled.
 *
 * @interface: Interface to bring up
 *
 * Returns Zero on success, negative on failure
 */
int __cvmx_helper_npi_enable(int interface)
{
	/*
	 * On CN50XX, CN52XX, and CN56XX we need to disable length
	 * checking so packet < 64 bytes and jumbo frames don't get
	 * errors.
	 */
	if (!OCTEON_IS_MODEL(OCTEON_CN3XXX) &&
	    !OCTEON_IS_MODEL(OCTEON_CN58XX)) {
		int num_ports = cvmx_helper_ports_on_interface(interface);
		int port;
		for (port = 0; port < num_ports; port++) {
			union cvmx_pip_prt_cfgx port_cfg;
			int ipd_port =
			    cvmx_helper_get_ipd_port(interface, port);
			port_cfg.u64 =
			    cvmx_read_csr(CVMX_PIP_PRT_CFGX(ipd_port));
			port_cfg.s.maxerr_en = 0;
			port_cfg.s.minerr_en = 0;
			cvmx_write_csr(CVMX_PIP_PRT_CFGX(ipd_port),
				       port_cfg.u64);
		}
	}

	/* Enables are controlled by the remote host, so nothing to do here */
	return 0;
}

Annotation

Implementation Notes