143 lines
4.5 KiB
C
143 lines
4.5 KiB
C
/***********************license start***************
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* Copyright (c) 2003-2010 Cavium Inc. (support@cavium.com). All rights
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* reserved.
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*
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of Cavium Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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* This Software, including technical data, may be subject to U.S. export control
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* laws, including the U.S. Export Administration Act and its associated
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* regulations, and may be subject to export or import regulations in other
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* countries.
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
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* AND WITH ALL FAULTS AND CAVIUM INC. MAKES NO PROMISES, REPRESENTATIONS OR
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* WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO
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* THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR
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* DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM
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* SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE,
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* MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF
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* VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR
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* CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT OF USE OR
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* PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
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***********************license end**************************************/
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/**
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* @file
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*
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* Interface to Core, IO and DDR Clock.
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*
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* <hr>$Revision: 45089 $<hr>
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*/
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#ifdef CVMX_BUILD_FOR_LINUX_KERNEL
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#include <linux/module.h>
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#include <asm/octeon/octeon.h>
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#include <asm/octeon/cvmx-clock.h>
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#include <asm/octeon/cvmx-npei-defs.h>
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#include <asm/octeon/cvmx-pexp-defs.h>
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#include <asm/octeon/cvmx-dbg-defs.h>
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#else
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#if !defined(__FreeBSD__) || !defined(_KERNEL)
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#include "executive-config.h"
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#endif
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#include "cvmx.h"
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#endif
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#ifndef CVMX_BUILD_FOR_UBOOT
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static uint64_t rate_eclk = 0;
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static uint64_t rate_sclk = 0;
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static uint64_t rate_dclk = 0;
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#endif
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/**
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* Get clock rate based on the clock type.
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*
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* @param clock - Enumeration of the clock type.
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* @return - return the clock rate.
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*/
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uint64_t cvmx_clock_get_rate(cvmx_clock_t clock)
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{
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const uint64_t REF_CLOCK = 50000000;
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#ifdef CVMX_BUILD_FOR_UBOOT
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uint64_t rate_eclk = 0;
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uint64_t rate_sclk = 0;
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uint64_t rate_dclk = 0;
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#endif
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if (cvmx_unlikely(!rate_eclk))
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{
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/* Note: The order of these checks is important.
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** octeon_has_feature(OCTEON_FEATURE_PCIE) is true for both 6XXX
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** and 52XX/56XX, so OCTEON_FEATURE_NPEI _must_ be checked first */
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if (octeon_has_feature(OCTEON_FEATURE_NPEI))
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{
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cvmx_npei_dbg_data_t npei_dbg_data;
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npei_dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
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rate_eclk = REF_CLOCK * npei_dbg_data.s.c_mul;
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rate_sclk = rate_eclk;
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}
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else if (octeon_has_feature(OCTEON_FEATURE_PCIE))
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{
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cvmx_mio_rst_boot_t mio_rst_boot;
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mio_rst_boot.u64 = cvmx_read_csr(CVMX_MIO_RST_BOOT);
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rate_eclk = REF_CLOCK * mio_rst_boot.s.c_mul;
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rate_sclk = REF_CLOCK * mio_rst_boot.s.pnr_mul;
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}
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else
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{
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cvmx_dbg_data_t dbg_data;
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dbg_data.u64 = cvmx_read_csr(CVMX_DBG_DATA);
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rate_eclk = REF_CLOCK * dbg_data.s.c_mul;
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rate_sclk = rate_eclk;
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}
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}
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switch (clock)
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{
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case CVMX_CLOCK_SCLK:
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case CVMX_CLOCK_TIM:
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case CVMX_CLOCK_IPD:
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return rate_sclk;
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case CVMX_CLOCK_RCLK:
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case CVMX_CLOCK_CORE:
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return rate_eclk;
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case CVMX_CLOCK_DDR:
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#if !defined(CVMX_BUILD_FOR_LINUX_HOST) && !defined(CVMX_BUILD_FOR_TOOLCHAIN)
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if (cvmx_unlikely(!rate_dclk))
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rate_dclk = cvmx_sysinfo_get()->dram_data_rate_hz;
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#endif
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return rate_dclk;
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}
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cvmx_dprintf("cvmx_clock_get_rate: Unknown clock type\n");
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return 0;
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}
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#ifdef CVMX_BUILD_FOR_LINUX_KERNEL
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EXPORT_SYMBOL(cvmx_clock_get_rate);
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#endif
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