cvmx-clock.h revision 232812
1/***********************license start*************** 2 * Copyright (c) 2003-2010 Cavium Inc. (support@cavium.com). All rights 3 * reserved. 4 * 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: 9 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * * Redistributions in binary form must reproduce the above 14 * copyright notice, this list of conditions and the following 15 * disclaimer in the documentation and/or other materials provided 16 * with the distribution. 17 18 * * Neither the name of Cavium Inc. nor the names of 19 * its contributors may be used to endorse or promote products 20 * derived from this software without specific prior written 21 * permission. 22 23 * This Software, including technical data, may be subject to U.S. export control 24 * laws, including the U.S. Export Administration Act and its associated 25 * regulations, and may be subject to export or import regulations in other 26 * countries. 27 28 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS" 29 * AND WITH ALL FAULTS AND CAVIUM INC. MAKES NO PROMISES, REPRESENTATIONS OR 30 * WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO 31 * THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR 32 * DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM 33 * SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE, 34 * MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF 35 * VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR 36 * CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT OF USE OR 37 * PERFORMANCE OF THE SOFTWARE LIES WITH YOU. 38 ***********************license end**************************************/ 39 40 41 42 43 44 45 46/** 47 * @file 48 * 49 * Interface to Core, IO and DDR Clock. 50 * 51 * <hr>$Revision: 45089 $<hr> 52*/ 53 54#ifndef __CVMX_CLOCK_H__ 55#define __CVMX_CLOCK_H__ 56 57#ifdef CVMX_BUILD_FOR_LINUX_KERNEL 58#include <asm/octeon/octeon.h> 59#include <asm/octeon/cvmx-lmcx-defs.h> 60#else 61#include "cvmx.h" 62#endif 63 64#ifdef __cplusplus 65extern "C" { 66#endif 67 68/** 69 * Enumeration of different Clocks in Octeon. 70 */ 71typedef enum{ 72 CVMX_CLOCK_RCLK, /**< Clock used by cores, coherent bus and L2 cache. */ 73 CVMX_CLOCK_SCLK, /**< Clock used by IO blocks. */ 74 CVMX_CLOCK_DDR, /**< Clock used by DRAM */ 75 CVMX_CLOCK_CORE, /**< Alias for CVMX_CLOCK_RCLK */ 76 CVMX_CLOCK_TIM, /**< Alias for CVMX_CLOCK_SCLK */ 77 CVMX_CLOCK_IPD, /**< Alias for CVMX_CLOCK_SCLK */ 78} cvmx_clock_t; 79 80/** 81 * Get cycle count based on the clock type. 82 * 83 * @param clock - Enumeration of the clock type. 84 * @return - Get the number of cycles executed so far. 85 */ 86static inline uint64_t cvmx_clock_get_count(cvmx_clock_t clock) 87{ 88 switch(clock) 89 { 90 case CVMX_CLOCK_RCLK: 91 case CVMX_CLOCK_CORE: 92 { 93#ifndef __mips__ 94 return cvmx_read_csr(CVMX_IPD_CLK_COUNT); 95#elif defined(CVMX_ABI_O32) 96 uint32_t tmp_low, tmp_hi; 97 98 asm volatile ( 99 " .set push \n" 100 " .set mips64r2 \n" 101 " .set noreorder \n" 102 " rdhwr %[tmpl], $31 \n" 103 " dsrl %[tmph], %[tmpl], 32 \n" 104 " sll %[tmpl], 0 \n" 105 " sll %[tmph], 0 \n" 106 " .set pop \n" 107 : [tmpl] "=&r" (tmp_low), [tmph] "=&r" (tmp_hi) : ); 108 109 return(((uint64_t)tmp_hi << 32) + tmp_low); 110#else 111 uint64_t cycle; 112 CVMX_RDHWR(cycle, 31); 113 return(cycle); 114#endif 115 } 116 117 case CVMX_CLOCK_SCLK: 118 case CVMX_CLOCK_TIM: 119 case CVMX_CLOCK_IPD: 120 return cvmx_read_csr(CVMX_IPD_CLK_COUNT); 121 122 case CVMX_CLOCK_DDR: 123 if (OCTEON_IS_MODEL(OCTEON_CN6XXX) || OCTEON_IS_MODEL(OCTEON_CNF7XXX)) 124 return cvmx_read_csr(CVMX_LMCX_DCLK_CNT(0)); 125 else 126 return ((cvmx_read_csr(CVMX_LMCX_DCLK_CNT_HI(0)) << 32) | cvmx_read_csr(CVMX_LMCX_DCLK_CNT_LO(0))); 127 } 128 129 cvmx_dprintf("cvmx_clock_get_count: Unknown clock type\n"); 130 return 0; 131} 132 133extern uint64_t cvmx_clock_get_rate(cvmx_clock_t clock); 134 135#ifdef __cplusplus 136} 137#endif 138 139#endif /* __CVMX_CLOCK_H__ */ 140