diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/mpc55xxevb/startup/get-system-clock.c')
-rw-r--r-- | c/src/lib/libbsp/powerpc/mpc55xxevb/startup/get-system-clock.c | 85 |
1 files changed, 0 insertions, 85 deletions
diff --git a/c/src/lib/libbsp/powerpc/mpc55xxevb/startup/get-system-clock.c b/c/src/lib/libbsp/powerpc/mpc55xxevb/startup/get-system-clock.c deleted file mode 100644 index 42e2b38327..0000000000 --- a/c/src/lib/libbsp/powerpc/mpc55xxevb/startup/get-system-clock.c +++ /dev/null @@ -1,85 +0,0 @@ -/** - * @file - * - * @ingroup mpc55xx - * - * @brief System clock calculation. - */ - -/* - * Copyright (c) 2008-2011 embedded brains GmbH. All rights reserved. - * - * embedded brains GmbH - * Obere Lagerstr. 30 - * 82178 Puchheim - * Germany - * <rtems@embedded-brains.de> - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.org/license/LICENSE. - */ - -#include <bsp.h> -#include <bsp/start.h> -#include <bsp/mpc55xx-config.h> - -uint32_t mpc55xx_get_system_clock(void) -{ - uint32_t system_clock = 0; - - #ifdef MPC55XX_HAS_FMPLL - volatile struct FMPLL_tag *fmpll = &FMPLL; - union FMPLL_SYNSR_tag synsr = { .R = fmpll->SYNSR.R }; - uint32_t reference_clock = MPC55XX_REFERENCE_CLOCK; - bool pll_clock_mode = synsr.B.MODE != 0; - bool crystal_or_external_reference_mode = synsr.B.PLLSEL != 0; - - if (pll_clock_mode) { - if (crystal_or_external_reference_mode) { - union FMPLL_SYNCR_tag syncr = { .R = fmpll->SYNCR.R }; - uint32_t prediv = syncr.B.PREDIV; - uint32_t mfd = syncr.B.MFD; - uint32_t rfd = syncr.B.RFD; - - system_clock = ((reference_clock * (mfd + 4)) >> rfd) / (prediv + 1); - } else { - system_clock = 2 * reference_clock; - } - } else { - system_clock = reference_clock; - } - #endif - - #ifdef MPC55XX_HAS_FMPLL_ENHANCED - volatile struct FMPLL_tag *fmpll = &FMPLL; - union FMPLL_ESYNCR1_tag esyncr1 = { .R = fmpll->ESYNCR1.R }; - uint32_t reference_clock = MPC55XX_REFERENCE_CLOCK; - bool normal_mode = (esyncr1.B.CLKCFG & 0x4U) != 0; - - if (normal_mode) { - union FMPLL_ESYNCR2_tag esyncr2 = { .R = fmpll->ESYNCR2.R }; - uint32_t eprediv = esyncr1.B.EPREDIV; - uint32_t emfd = esyncr1.B.EMFD; - uint32_t erfd = esyncr2.B.ERFD; - - system_clock = ((reference_clock / (eprediv + 1)) * (emfd + 16)) - / (erfd + 1); - } else { - system_clock = reference_clock; - } - #endif - - #ifdef MPC55XX_HAS_MODE_CONTROL - /* FIXME: Assumes normal mode and external oscillator */ - PLLD_CR_32B_tag cr = { . R = CGM.FMPLL [0].CR.R }; - uint32_t xosc = MPC55XX_REFERENCE_CLOCK; - uint32_t ldf = cr.B.NDIV; - uint32_t idf = cr.B.IDF + 1; - uint32_t odf = 2U << cr.B.ODF; - - system_clock = (xosc * ldf) / (idf * odf); - #endif - - return system_clock; -} |