xref: /freebsd-10.0-release/sys/contrib/octeon-sdk/cvmx-clock.c

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/**
 * @file
 *
 * Interface to Core, IO and DDR Clock.
 *
 * <hr>$Revision: 45089 $<hr>
*/

#ifdef CVMX_BUILD_FOR_LINUX_KERNEL
#include <linux/module.h>
#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-clock.h>
#include <asm/octeon/cvmx-npei-defs.h>
#include <asm/octeon/cvmx-pexp-defs.h>
#include <asm/octeon/cvmx-dbg-defs.h>
#else
#include "executive-config.h"
#include "cvmx.h"
#endif

#ifndef CVMX_BUILD_FOR_UBOOT
static uint64_t rate_eclk = 0;
static uint64_t rate_sclk = 0;
static uint64_t rate_dclk = 0;
#endif

/**
 * Get clock rate based on the clock type.
 *
 * @param clock - Enumeration of the clock type.
 * @return      - return the clock rate.
 */
uint64_t cvmx_clock_get_rate(cvmx_clock_t clock)
{
    const uint64_t REF_CLOCK = 50000000;

#ifdef CVMX_BUILD_FOR_UBOOT
    uint64_t rate_eclk = 0;
    uint64_t rate_sclk = 0;
    uint64_t rate_dclk = 0;
#endif

    if (cvmx_unlikely(!rate_eclk))
    {
        if (octeon_has_feature(OCTEON_FEATURE_NPEI))
        {
            cvmx_npei_dbg_data_t npei_dbg_data;
            npei_dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
            rate_eclk =  REF_CLOCK * npei_dbg_data.s.c_mul;
            rate_sclk = rate_eclk;
        }
        else if (octeon_has_feature(OCTEON_FEATURE_PCIE))
        {
            cvmx_mio_rst_boot_t mio_rst_boot;
            mio_rst_boot.u64 = cvmx_read_csr(CVMX_MIO_RST_BOOT);
            rate_eclk =  REF_CLOCK * mio_rst_boot.s.c_mul;
            rate_sclk = REF_CLOCK * mio_rst_boot.s.pnr_mul;
        }
        else
        {
            cvmx_dbg_data_t dbg_data;
            dbg_data.u64 = cvmx_read_csr(CVMX_DBG_DATA);
            rate_eclk =  REF_CLOCK * dbg_data.s.c_mul;
            rate_sclk = rate_eclk;
        }
    }

    switch (clock)
    {
        case CVMX_CLOCK_SCLK:
        case CVMX_CLOCK_TIM:
        case CVMX_CLOCK_IPD:
            return rate_sclk;

        case CVMX_CLOCK_RCLK:
        case CVMX_CLOCK_CORE:
            return rate_eclk;

        case CVMX_CLOCK_DDR:
#if !defined(CVMX_BUILD_FOR_LINUX_HOST) && !defined(__OCTEON_NEWLIB__)
            if (cvmx_unlikely(!rate_dclk))
                rate_dclk = cvmx_sysinfo_get()->dram_data_rate_hz;
#endif
            return rate_dclk;
    }

    cvmx_dprintf("cvmx_clock_get_rate: Unknown clock type\n");
    return 0;
}
#ifdef CVMX_BUILD_FOR_LINUX_KERNEL
EXPORT_SYMBOL(cvmx_clock_get_rate);
#endif