File content as of revision 180:d79f997829d6:

/* mbed Microcontroller Library
 *******************************************************************************
 * Copyright (c) 2015, STMicroelectronics
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of STMicroelectronics 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 IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 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.
 *******************************************************************************
 */
#include "mbed_assert.h"
#include "mbed_error.h"
#include "spi_api.h"

#if DEVICE_SPI

#include "cmsis.h"
#include "pinmap.h"
#include "PeripheralPins.h"
#include "mbed_error.h"

#if DEVICE_SPI_ASYNCH
    #define SPI_S(obj)    (( struct spi_s *)(&(obj->spi)))
#else
    #define SPI_S(obj)    (( struct spi_s *)(obj))
#endif

/*
 * Only the frequency is managed in the family specific part
 * the rest of SPI management is common to all STM32 families
 */
int spi_get_clock_freq(spi_t *obj) {
    struct spi_s *spiobj = SPI_S(obj);
	int spi_hz = 0;

	/* Get source clock depending on SPI instance */
    switch ((int)spiobj->spi) {
        case SPI_1:
		case SPI_4:
		case SPI_5:
		case SPI_6:	
			/* SPI_1, SPI_4, SPI_5 and SPI_6. Source CLK is PCKL2 */
			spi_hz = HAL_RCC_GetPCLK2Freq();
			break;
		case SPI_2:
		case SPI_3:
			/* SPI_2 and SPI_3. Source CLK is PCKL1 */
			spi_hz = HAL_RCC_GetPCLK1Freq();
			break;
		default:
			error("CLK: SPI instance not set");
            break;
    }
    return spi_hz;
}

#endif