diff options
Diffstat (limited to 'cvmx-clock.c')
| -rw-r--r-- | cvmx-clock.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/cvmx-clock.c b/cvmx-clock.c new file mode 100644 index 000000000000..707a18d1b5a1 --- /dev/null +++ b/cvmx-clock.c @@ -0,0 +1,137 @@ +/***********************license start*************** + * Copyright (c) 2003-2010 Cavium Networks (support@cavium.com). All rights + * reserved. + * + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials provided + * with the distribution. + + * * Neither the name of Cavium Networks nor the names of + * its contributors may be used to endorse or promote products + * derived from this software without specific prior written + * permission. + + * This Software, including technical data, may be subject to U.S. export control + * laws, including the U.S. Export Administration Act and its associated + * regulations, and may be subject to export or import regulations in other + * countries. + + * TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS" + * AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR + * WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO + * THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR + * DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM + * SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE, + * MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF + * VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR + * CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT OF USE OR + * PERFORMANCE OF THE SOFTWARE LIES WITH YOU. + ***********************license end**************************************/ + + + + + + + +/** + * @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 |