xref: /freebsd-10-stable/sys/contrib/octeon-sdk/cvmx-clock.h

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

#ifndef __CVMX_CLOCK_H__
#define __CVMX_CLOCK_H__

#ifdef CVMX_BUILD_FOR_LINUX_KERNEL
#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-lmcx-defs.h>
#else
#include "cvmx.h"
#endif

#ifdef	__cplusplus
extern "C" {
#endif

/**
 * Enumeration of different Clocks in Octeon.
 */
typedef enum{
    CVMX_CLOCK_RCLK,        /**< Clock used by cores, coherent bus and L2 cache. */
    CVMX_CLOCK_SCLK,        /**< Clock used by IO blocks. */
    CVMX_CLOCK_DDR,         /**< Clock used by DRAM */
    CVMX_CLOCK_CORE,        /**< Alias for CVMX_CLOCK_RCLK */
    CVMX_CLOCK_TIM,         /**< Alias for CVMX_CLOCK_SCLK */
    CVMX_CLOCK_IPD,         /**< Alias for CVMX_CLOCK_SCLK */
} cvmx_clock_t;

/**
 * Get cycle count based on the clock type.
 *
 * @param clock - Enumeration of the clock type.
 * @return      - Get the number of cycles executed so far.
 */
static inline uint64_t cvmx_clock_get_count(cvmx_clock_t clock)
{
    switch(clock)
    {
        case CVMX_CLOCK_RCLK:
        case CVMX_CLOCK_CORE:
        {
#ifndef __mips__
            return cvmx_read_csr(CVMX_IPD_CLK_COUNT);
#elif defined(CVMX_ABI_O32)
            uint32_t tmp_low, tmp_hi;

            asm volatile (
               "   .set push                    \n"
               "   .set mips64r2                \n"
               "   .set noreorder               \n"
               "   rdhwr %[tmpl], $31           \n"
               "   dsrl  %[tmph], %[tmpl], 32   \n"
               "   sll   %[tmpl], 0             \n"
               "   sll   %[tmph], 0             \n"
               "   .set pop                 \n"
                  : [tmpl] "=&r" (tmp_low), [tmph] "=&r" (tmp_hi) : );

            return(((uint64_t)tmp_hi << 32) + tmp_low);
#else
            uint64_t cycle;
            CVMX_RDHWR(cycle, 31);
            return(cycle);
#endif
        }

        case CVMX_CLOCK_SCLK:
        case CVMX_CLOCK_TIM:
        case CVMX_CLOCK_IPD:
            return cvmx_read_csr(CVMX_IPD_CLK_COUNT);

        case CVMX_CLOCK_DDR:
            if (OCTEON_IS_MODEL(OCTEON_CN6XXX) || OCTEON_IS_MODEL(OCTEON_CNF7XXX))
                return cvmx_read_csr(CVMX_LMCX_DCLK_CNT(0));
            else
                return ((cvmx_read_csr(CVMX_LMCX_DCLK_CNT_HI(0)) << 32) | cvmx_read_csr(CVMX_LMCX_DCLK_CNT_LO(0)));
    }

    cvmx_dprintf("cvmx_clock_get_count: Unknown clock type\n");
    return 0;
}

extern uint64_t cvmx_clock_get_rate(cvmx_clock_t clock);

#ifdef	__cplusplus
}
#endif

#endif /* __CVMX_CLOCK_H__ */