boards/arduino-due: removed system_sam3xa.c

boards/arduino-due/system_sam3xa.c

-/*! \file *********************************************************************
- *
- * \brief Provides the low-level initialization functions that called
- * on chip startup.
- *
- * Copyright (c) 2012, Atmel Corporation
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following condition is met:
- *
- * - Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the disclaimer below.
- *
- * Atmel's name may not be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
- * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
- * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
- * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * \asf_license_stop
- *
- * \par Purpose
- *
- * This file provides basic support for Cortex-M processor based
- * microcontrollers.
- *
- * \author               Atmel Corporation: http://www.atmel.com \n
- *                       Support and FAQ: http://support.atmel.no/
- *
- ******************************************************************************/
-
-#include "sam3x8e.h"
-
-/* @cond 0 */
-/**INDENT-OFF**/
-#ifdef __cplusplus
-extern "C" {
-#endif
-/**INDENT-ON**/
-/* @endcond */
-
-/* Clock settings (84MHz) */
-#define SYS_BOARD_OSCOUNT   (CKGR_MOR_MOSCXTST(0x8))
-#define SYS_BOARD_PLLAR     (CKGR_PLLAR_ONE \
-                            | CKGR_PLLAR_MULA(0xdUL) \
-                            | CKGR_PLLAR_PLLACOUNT(0x3fUL) \
-                            | CKGR_PLLAR_DIVA(0x1UL))
-#define SYS_BOARD_MCKR      (PMC_MCKR_PRES_CLK_2 | PMC_MCKR_CSS_PLLA_CLK)
-
-/* Clock Definitions */
-#define SYS_UTMIPLL             (480000000UL)   /* UTMI PLL frequency */
-
-#define SYS_CKGR_MOR_KEY_VALUE  CKGR_MOR_KEY(0x37) /* Key to unlock MOR register */
-
-/* FIXME: should be generated by sock */
-uint32_t SystemCoreClock = CHIP_FREQ_MAINCK_RC_4MHZ;
-
-/**
- * \brief Setup the microcontroller system.
- * Initialize the System and update the SystemFrequency variable.
- */
-void SystemInit(void)
-{
-    /* Set FWS according to SYS_BOARD_MCKR configuration */
-    EFC0->EEFC_FMR = EEFC_FMR_FWS(4);
-    EFC1->EEFC_FMR = EEFC_FMR_FWS(4);
-
-    /* Initialize main oscillator */
-    if (!(PMC->CKGR_MOR & CKGR_MOR_MOSCSEL)) {
-        PMC->CKGR_MOR = SYS_CKGR_MOR_KEY_VALUE | SYS_BOARD_OSCOUNT |
-                                 CKGR_MOR_MOSCRCEN | CKGR_MOR_MOSCXTEN;
-        while (!(PMC->PMC_SR & PMC_SR_MOSCXTS)) {
-        }
-    }
-
-    /* Switch to 3-20MHz Xtal oscillator */
-    PMC->CKGR_MOR = SYS_CKGR_MOR_KEY_VALUE | SYS_BOARD_OSCOUNT |
-                               CKGR_MOR_MOSCRCEN | CKGR_MOR_MOSCXTEN | CKGR_MOR_MOSCSEL;
-
-    while (!(PMC->PMC_SR & PMC_SR_MOSCSELS)) {
-    }
-    PMC->PMC_MCKR = (PMC->PMC_MCKR & ~(uint32_t)PMC_MCKR_CSS_Msk) |
-                             PMC_MCKR_CSS_MAIN_CLK;
-    while (!(PMC->PMC_SR & PMC_SR_MCKRDY)) {
-    }
-
-    /* Initialize PLLA */
-    PMC->CKGR_PLLAR = SYS_BOARD_PLLAR;
-    while (!(PMC->PMC_SR & PMC_SR_LOCKA)) {
-    }
-
-    /* Switch to main clock */
-    PMC->PMC_MCKR = (SYS_BOARD_MCKR & ~PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_MAIN_CLK;
-    while (!(PMC->PMC_SR & PMC_SR_MCKRDY)) {
-    }
-
-    /* Switch to PLLA */
-    PMC->PMC_MCKR = SYS_BOARD_MCKR;
-    while (!(PMC->PMC_SR & PMC_SR_MCKRDY)) {
-    }
-
-    SystemCoreClock = CHIP_FREQ_CPU_MAX;
-}
-
-void SystemCoreClockUpdate(void)
-{
-    /* Determine clock frequency according to clock register values */
-    switch (PMC->PMC_MCKR & PMC_MCKR_CSS_Msk) {
-    case PMC_MCKR_CSS_SLOW_CLK: /* Slow clock */
-        if (SUPC->SUPC_SR & SUPC_SR_OSCSEL) {
-            SystemCoreClock = CHIP_FREQ_XTAL_32K;
-        } else {
-            SystemCoreClock = CHIP_FREQ_SLCK_RC;
-        }
-        break;
-    case PMC_MCKR_CSS_MAIN_CLK: /* Main clock */
-        if (PMC->CKGR_MOR & CKGR_MOR_MOSCSEL) {
-            SystemCoreClock = CHIP_FREQ_XTAL_12M;
-        } else {
-            SystemCoreClock = CHIP_FREQ_MAINCK_RC_4MHZ;
-
-            switch (PMC->CKGR_MOR & CKGR_MOR_MOSCRCF_Msk) {
-            case CKGR_MOR_MOSCRCF_4_MHz:
-                break;
-            case CKGR_MOR_MOSCRCF_8_MHz:
-                SystemCoreClock *= 2U;
-                break;
-            case CKGR_MOR_MOSCRCF_12_MHz:
-                SystemCoreClock *= 3U;
-                break;
-            default:
-                break;
-            }
-        }
-        break;
-    case PMC_MCKR_CSS_PLLA_CLK: /* PLLA clock */
-    case PMC_MCKR_CSS_UPLL_CLK: /* UPLL clock */
-        if (PMC->CKGR_MOR & CKGR_MOR_MOSCSEL) {
-            SystemCoreClock = CHIP_FREQ_XTAL_12M;
-        } else {
-            SystemCoreClock = CHIP_FREQ_MAINCK_RC_4MHZ;
-
-            switch (PMC->CKGR_MOR & CKGR_MOR_MOSCRCF_Msk) {
-            case CKGR_MOR_MOSCRCF_4_MHz:
-                break;
-            case CKGR_MOR_MOSCRCF_8_MHz:
-                SystemCoreClock *= 2U;
-                break;
-            case CKGR_MOR_MOSCRCF_12_MHz:
-                SystemCoreClock *= 3U;
-                break;
-            default:
-                break;
-            }
-        }
-        if ((PMC->PMC_MCKR & PMC_MCKR_CSS_Msk) == PMC_MCKR_CSS_PLLA_CLK) {
-            SystemCoreClock *= ((((PMC->CKGR_PLLAR) & CKGR_PLLAR_MULA_Msk) >>
-                                            CKGR_PLLAR_MULA_Pos) + 1U);
-            SystemCoreClock /= ((((PMC->CKGR_PLLAR) & CKGR_PLLAR_DIVA_Msk) >>
-                                             CKGR_PLLAR_DIVA_Pos));
-        } else {
-            SystemCoreClock = SYS_UTMIPLL / 2U;
-        }
-        break;
-    }
-
-    if ((PMC->PMC_MCKR & PMC_MCKR_PRES_Msk) == PMC_MCKR_PRES_CLK_3) {
-        SystemCoreClock /= 3U;
-    } else {
-        SystemCoreClock >>= ((PMC->PMC_MCKR & PMC_MCKR_PRES_Msk) >>
-                                      PMC_MCKR_PRES_Pos);
-    }
-}
-
-/**
- * Initialize flash.
- */
-void system_init_flash(uint32_t dw_clk)
-{
-    /* Set FWS for embedded Flash access according to operating frequency */
-    if (dw_clk < CHIP_FREQ_FWS_0) {
-        EFC0->EEFC_FMR = EEFC_FMR_FWS(0);
-        EFC1->EEFC_FMR = EEFC_FMR_FWS(0);
-    } else if (dw_clk < CHIP_FREQ_FWS_1) {
-        EFC0->EEFC_FMR = EEFC_FMR_FWS(1);
-        EFC1->EEFC_FMR = EEFC_FMR_FWS(1);
-    } else if (dw_clk < CHIP_FREQ_FWS_2) {
-        EFC0->EEFC_FMR = EEFC_FMR_FWS(2);
-        EFC1->EEFC_FMR = EEFC_FMR_FWS(2);
-    } else if (dw_clk < CHIP_FREQ_FWS_3) {
-        EFC0->EEFC_FMR = EEFC_FMR_FWS(3);
-        EFC1->EEFC_FMR = EEFC_FMR_FWS(3);
-    } else {
-        EFC0->EEFC_FMR = EEFC_FMR_FWS(4);
-        EFC1->EEFC_FMR = EEFC_FMR_FWS(4);
-    }
-}
-
-/* @cond 0 */
-/**INDENT-OFF**/
-#ifdef __cplusplus
-}
-#endif
-/**INDENT-ON**/
-/* @endcond */