cvmx-clock.c 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#ifdef CVMX_BUILD_FOR_LINUX_KERNEL 55#include <linux/module.h> 56#include <asm/octeon/octeon.h> 57#include <asm/octeon/cvmx-clock.h> 58#include <asm/octeon/cvmx-npei-defs.h> 59#include <asm/octeon/cvmx-pexp-defs.h> 60#include <asm/octeon/cvmx-dbg-defs.h> 61#else 62#if !defined(__FreeBSD__) || !defined(_KERNEL) 63#include "executive-config.h" 64#endif 65#include "cvmx.h" 66#endif 67 68#ifndef CVMX_BUILD_FOR_UBOOT 69static uint64_t rate_eclk = 0; 70static uint64_t rate_sclk = 0; 71static uint64_t rate_dclk = 0; 72#endif 73 74/** 75 * Get clock rate based on the clock type. 76 * 77 * @param clock - Enumeration of the clock type. 78 * @return - return the clock rate. 79 */ 80uint64_t cvmx_clock_get_rate(cvmx_clock_t clock) 81{ 82 const uint64_t REF_CLOCK = 50000000; 83 84#ifdef CVMX_BUILD_FOR_UBOOT 85 uint64_t rate_eclk = 0; 86 uint64_t rate_sclk = 0; 87 uint64_t rate_dclk = 0; 88#endif 89 90 if (cvmx_unlikely(!rate_eclk)) 91 { 92 /* Note: The order of these checks is important. 93 ** octeon_has_feature(OCTEON_FEATURE_PCIE) is true for both 6XXX 94 ** and 52XX/56XX, so OCTEON_FEATURE_NPEI _must_ be checked first */ 95 if (octeon_has_feature(OCTEON_FEATURE_NPEI)) 96 { 97 cvmx_npei_dbg_data_t npei_dbg_data; 98 npei_dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA); 99 rate_eclk = REF_CLOCK * npei_dbg_data.s.c_mul; 100 rate_sclk = rate_eclk; 101 } 102 else if (octeon_has_feature(OCTEON_FEATURE_PCIE)) 103 { 104 cvmx_mio_rst_boot_t mio_rst_boot; 105 mio_rst_boot.u64 = cvmx_read_csr(CVMX_MIO_RST_BOOT); 106 rate_eclk = REF_CLOCK * mio_rst_boot.s.c_mul; 107 rate_sclk = REF_CLOCK * mio_rst_boot.s.pnr_mul; 108 } 109 else 110 { 111 cvmx_dbg_data_t dbg_data; 112 dbg_data.u64 = cvmx_read_csr(CVMX_DBG_DATA); 113 rate_eclk = REF_CLOCK * dbg_data.s.c_mul; 114 rate_sclk = rate_eclk; 115 } 116 } 117 118 switch (clock) 119 { 120 case CVMX_CLOCK_SCLK: 121 case CVMX_CLOCK_TIM: 122 case CVMX_CLOCK_IPD: 123 return rate_sclk; 124 125 case CVMX_CLOCK_RCLK: 126 case CVMX_CLOCK_CORE: 127 return rate_eclk; 128 129 case CVMX_CLOCK_DDR: 130#if !defined(CVMX_BUILD_FOR_LINUX_HOST) && !defined(CVMX_BUILD_FOR_TOOLCHAIN) 131 if (cvmx_unlikely(!rate_dclk)) 132 rate_dclk = cvmx_sysinfo_get()->dram_data_rate_hz; 133#endif 134 return rate_dclk; 135 } 136 137 cvmx_dprintf("cvmx_clock_get_rate: Unknown clock type\n"); 138 return 0; 139} 140#ifdef CVMX_BUILD_FOR_LINUX_KERNEL 141EXPORT_SYMBOL(cvmx_clock_get_rate); 142#endif 143