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

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

File Facts

System
Linux kernel
Corpus path
arch/mips/cavium-octeon/executive/cvmx-helper-spi.c
Extension
.c
Size
6202 bytes
Lines
203
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

cvmx_spi4000_is_present(interface)) {
		return 10;
	} else {
		return 16;
	}
}

/**
 * Probe a SPI interface and determine the number of ports
 * connected to it. The SPI 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_spi_probe(int interface)
{
	int num_ports = 0;

	if ((cvmx_sysinfo_get()->board_type != CVMX_BOARD_TYPE_SIM) &&
	    cvmx_spi4000_is_present(interface)) {
		num_ports = 10;
	} else {
		union cvmx_pko_reg_crc_enable enable;
		num_ports = 16;
		/*
		 * Unlike the SPI4000, most SPI devices don't
		 * automatically put on the L2 CRC. For everything
		 * except for the SPI4000 have PKO append the L2 CRC
		 * to the packet.
		 */
		enable.u64 = cvmx_read_csr(CVMX_PKO_REG_CRC_ENABLE);
		enable.s.enable |= 0xffff << (interface * 16);
		cvmx_write_csr(CVMX_PKO_REG_CRC_ENABLE, enable.u64);
	}
	__cvmx_helper_setup_gmx(interface, num_ports);
	return num_ports;
}

/**
 * Bringup and enable a SPI 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_spi_enable(int interface)
{
	/*
	 * Normally the ethernet L2 CRC is checked and stripped in the
	 * GMX block.  When you are using SPI, this isn' the case and
	 * IPD needs to check the L2 CRC.
	 */
	int num_ports = cvmx_helper_ports_on_interface(interface);
	int ipd_port;
	for (ipd_port = interface * 16; ipd_port < interface * 16 + num_ports;
	     ipd_port++) {
		union cvmx_pip_prt_cfgx port_config;
		port_config.u64 = cvmx_read_csr(CVMX_PIP_PRT_CFGX(ipd_port));
		port_config.s.crc_en = 1;
		cvmx_write_csr(CVMX_PIP_PRT_CFGX(ipd_port), port_config.u64);
	}

	if (cvmx_sysinfo_get()->board_type != CVMX_BOARD_TYPE_SIM) {
		cvmx_spi_start_interface(interface, CVMX_SPI_MODE_DUPLEX,
					 CVMX_HELPER_SPI_TIMEOUT, num_ports);
		if (cvmx_spi4000_is_present(interface))
			cvmx_spi4000_initialize(interface);
	}
	__cvmx_interrupt_spxx_int_msk_enable(interface);
	__cvmx_interrupt_stxx_int_msk_enable(interface);
	__cvmx_interrupt_gmxx_enable(interface);
	return 0;
}

/**
 * Return the link state of an IPD/PKO port as returned by
 * auto negotiation. The result of this function may not match
 * Octeon's link config if auto negotiation has changed since
 * the last call to cvmx_helper_link_set().
 *
 * @ipd_port: IPD/PKO port to query
 *
 * Returns Link state
 */
union cvmx_helper_link_info __cvmx_helper_spi_link_get(int ipd_port)
{

Annotation

Implementation Notes