From d378f880e50394db03a9d59948de1fc8f33f8284 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Tue, 27 Dec 2011 22:24:02 +0100 Subject: remove section initializing non-existant external clock osmo-sdr doesn't have a 32kHz clock crystal. --- boards/osmo-sdr/board_lowlevel.c | 208 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 208 insertions(+) create mode 100644 boards/osmo-sdr/board_lowlevel.c (limited to 'boards/osmo-sdr') diff --git a/boards/osmo-sdr/board_lowlevel.c b/boards/osmo-sdr/board_lowlevel.c new file mode 100644 index 0000000..823d3d0 --- /dev/null +++ b/boards/osmo-sdr/board_lowlevel.c @@ -0,0 +1,208 @@ +/* ---------------------------------------------------------------------------- + * ATMEL Microcontroller Software Support + * ---------------------------------------------------------------------------- + * Copyright (c) 2008, Atmel Corporation + * + * 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 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. + * ---------------------------------------------------------------------------- + */ + +//------------------------------------------------------------------------------ +/// \unit +/// +/// !Purpose +/// +/// Provides the low-level initialization function that gets called on chip +/// startup. +/// +/// !Usage +/// +/// LowLevelInit() is called in #board_cstartup_xxx.c#. +//------------------------------------------------------------------------------ + +//------------------------------------------------------------------------------ +// Headers +//------------------------------------------------------------------------------ + +#include "board.h" +#include "board_memories.h" +#include "board_lowlevel.h" +#include + +//------------------------------------------------------------------------------ +// Local definitions +//------------------------------------------------------------------------------ +#define AT91C_CKGR_MUL_SHIFT 16 +#define AT91C_CKGR_OUT_SHIFT 14 +#define AT91C_CKGR_PLLCOUNT_SHIFT 8 +#define AT91C_CKGR_DIV_SHIFT 0 + +#if (BOARD_MCK == 48000000) +// Settings at 48/48MHz +#define BOARD_OSCOUNT (AT91C_CKGR_MOSCXTST & (0x8 << 8)) +#define BOARD_PLLR ((1 << 29) | (0x7 << AT91C_CKGR_MUL_SHIFT) \ + | (0x0 << AT91C_CKGR_OUT_SHIFT) |(0x1 << AT91C_CKGR_PLLCOUNT_SHIFT) \ + | (0x1 << AT91C_CKGR_DIV_SHIFT)) +#define BOARD_MCKR ( AT91C_PMC_PRES_CLK_2 | AT91C_PMC_CSS_PLLA_CLK) +#elif (BOARD_MCK == 96000000) +// Settings at 96/96MHz +#define BOARD_OSCOUNT (AT91C_CKGR_MOSCXTST & (0x8 << 8)) +#define BOARD_PLLR ((1 << 29) | (0x7 << AT91C_CKGR_MUL_SHIFT) \ + | (0x0 << AT91C_CKGR_OUT_SHIFT) |(0x1 << AT91C_CKGR_PLLCOUNT_SHIFT) \ + | (0x1 << AT91C_CKGR_DIV_SHIFT)) +#define BOARD_MCKR ( AT91C_PMC_PRES_CLK | AT91C_PMC_CSS_PLLA_CLK) +#else + #error "No matched BOARD_MCK." +#endif + +// Define clock timeout +#define CLOCK_TIMEOUT 0xFFFFFFFF + +//------------------------------------------------------------------------------ +// Local variables +//------------------------------------------------------------------------------ + +//------------------------------------------------------------------------------ +// Local functions +//------------------------------------------------------------------------------ + +//------------------------------------------------------------------------------ +// Exported functions +//------------------------------------------------------------------------------ + +//------------------------------------------------------------------------------ +/// After POR, at91sam3u device is running on 4MHz internal RC +/// At the end of the LowLevelInit procedure MCK = 48MHz PLLA = 96 CPU=48MHz +/// Performs the low-level initialization of the chip. This includes EFC, master +/// clock, IRQ & watchdog configuration. +//------------------------------------------------------------------------------ +void LowLevelInit(void) +{ + unsigned int timeout = 0; + + /* Set 2 WS for Embedded Flash Access + ************************************/ + AT91C_BASE_EFC0->EFC_FMR = AT91C_EFC_FWS_2WS; +#if defined(AT91C_BASE_EFC1) + AT91C_BASE_EFC1->EFC_FMR = AT91C_EFC_FWS_2WS; +#endif + /* Watchdog initialization + *************************/ + AT91C_BASE_WDTC->WDTC_WDMR = AT91C_WDTC_WDDIS; + + /* Initialize main oscillator + ****************************/ + if(!(AT91C_BASE_PMC->PMC_MOR & AT91C_CKGR_MOSCSEL)) + { + + AT91C_BASE_PMC->PMC_MOR = (0x37 << 16) | BOARD_OSCOUNT | AT91C_CKGR_MOSCRCEN | AT91C_CKGR_MOSCXTEN; + timeout = 0; + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCXTS) && (timeout++ < CLOCK_TIMEOUT)); + + } + + /* Switch to 3-20MHz Xtal oscillator */ + AT91C_BASE_PMC->PMC_MOR = (0x37 << 16) | BOARD_OSCOUNT | AT91C_CKGR_MOSCRCEN | AT91C_CKGR_MOSCXTEN | AT91C_CKGR_MOSCSEL; + timeout = 0; + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCSELS) && (timeout++ < CLOCK_TIMEOUT)); + AT91C_BASE_PMC->PMC_MCKR = (AT91C_BASE_PMC->PMC_MCKR & ~AT91C_PMC_CSS) | AT91C_PMC_CSS_MAIN_CLK; + timeout = 0; + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) && (timeout++ < CLOCK_TIMEOUT)); + + /* Initialize PLLA */ + AT91C_BASE_PMC->PMC_PLLAR = BOARD_PLLR; + timeout = 0; + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKA) && (timeout++ < CLOCK_TIMEOUT)); + + /* Initialize UTMI for USB usage, can be disabled if not using USB for the sake of saving power*/ + AT91C_BASE_CKGR->CKGR_UCKR |= (AT91C_CKGR_UPLLCOUNT & (3 << 20)) | AT91C_CKGR_UPLLEN; + timeout = 0; + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKU) && (timeout++ < CLOCK_TIMEOUT)); + + /* Switch to fast clock + **********************/ + AT91C_BASE_PMC->PMC_MCKR = (BOARD_MCKR & ~AT91C_PMC_CSS) | AT91C_PMC_CSS_MAIN_CLK; + timeout = 0; + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) && (timeout++ < CLOCK_TIMEOUT)); + + AT91C_BASE_PMC->PMC_MCKR = BOARD_MCKR; + timeout = 0; + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) && (timeout++ < CLOCK_TIMEOUT)); + + /* Enable clock for UART + ************************/ + AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_DBGU); + + /* Optimize CPU setting for speed, for engineering samples only */ + SetDefaultMaster(1); +} + +//------------------------------------------------------------------------------ +/// Enable or disable default master access +/// \param enalbe 1 enable defaultMaster settings, 0 disable it. +//------------------------------------------------------------------------------ +void SetDefaultMaster(unsigned char enable) +{ + AT91PS_HMATRIX2 pMatrix = AT91C_BASE_MATRIX; + + // Set default master + if (enable == 1) { + + // Set default master: SRAM0 -> Cortex-M3 System + pMatrix->HMATRIX2_SCFG0 |= AT91C_MATRIX_FIXED_DEFMSTR_SCFG0_ARMS | + AT91C_MATRIX_DEFMSTR_TYPE_FIXED_DEFMSTR; + + // Set default master: SRAM1 -> Cortex-M3 System + pMatrix->HMATRIX2_SCFG1 |= AT91C_MATRIX_FIXED_DEFMSTR_SCFG1_ARMS | + AT91C_MATRIX_DEFMSTR_TYPE_FIXED_DEFMSTR; + + // Set default master: Internal flash0 -> Cortex-M3 Instruction/Data + pMatrix->HMATRIX2_SCFG3 |= AT91C_MATRIX_FIXED_DEFMSTR_SCFG3_ARMC | + AT91C_MATRIX_DEFMSTR_TYPE_FIXED_DEFMSTR; + } else { + + // Clear default master: SRAM0 -> Cortex-M3 System + pMatrix->HMATRIX2_SCFG0 &= (~AT91C_MATRIX_DEFMSTR_TYPE); + + // Clear default master: SRAM1 -> Cortex-M3 System + pMatrix->HMATRIX2_SCFG1 &= (~AT91C_MATRIX_DEFMSTR_TYPE); + + // Clear default master: Internal flash0 -> Cortex-M3 Instruction/Data + pMatrix->HMATRIX2_SCFG3 &= (~AT91C_MATRIX_DEFMSTR_TYPE); + } +} + +//------------------------------------------------------------------------------ +/// Set flash wait state +/// \param ws Value of flash wait state +//------------------------------------------------------------------------------ +void SetFlashWaitState(unsigned char ws) +{ + // Set Wait State for Embedded Flash Access + AT91C_BASE_EFC0->EFC_FMR = ((ws << 8) & AT91C_EFC_FWS); + +#if defined(AT91C_BASE_EFC1) + AT91C_BASE_EFC1->EFC_FMR = ((ws << 8) & AT91C_EFC_FWS); +#endif +} + -- cgit v1.2.3