source: rtems/c/src/lib/libbsp/arm/atsam/libraries/libchip/source/xdma_hardware_interface.c @ e1eeb883

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/** \addtogroup dmad_module
 *
 * \section DmaHw Dma Hardware Interface Usage
 * <ul>
 * <li> The DMA controller can handle the transfer between peripherals and memory
 * and so receives the triggers from the peripherals. The hardware interface
 * number are getting from DMAIF_Get_ChannelNumber().</li>

 * <li> DMAIF_IsValidatedPeripherOnDma() helps to check if the given DMAC has
 * associated peripheral identifier coded by the given  peripheral.</li>
 *
 * </ul>
 */
/*@{*/
/*@}*/

/** \file */
/*----------------------------------------------------------------------------
 *        Headers
 *----------------------------------------------------------------------------*/
#include "chip.h"

/*----------------------------------------------------------------------------
 *        Local variables
 *----------------------------------------------------------------------------*/
/** Array of DMA Channel definition for SAMv7 chip*/
static const XdmaHardwareInterface xdmaHwIf[] = {
        /* xdmac, peripheral,  T/R, HW interface number*/
        {0,   ID_HSMCI,     0,      0},
        {0,   ID_HSMCI,     1,      0},
        {0,   ID_SPI0,      0,      1},
        {0,   ID_SPI0,      1,      2},
        {0,   ID_SPI1,      0,      3},
        {0,   ID_SPI1,      1,      4},
        {0,   ID_QSPI,      0,      5},
        {0,   ID_QSPI,      1,      6},
        {0,   ID_USART0,    0,      7},
        {0,   ID_USART0,    1,      8},
        {0,   ID_USART1,    0,      9},
        {0,   ID_USART1,    1,      10},
        {0,   ID_USART2,    0,      11},
        {0,   ID_USART2,    1,      12},
        {0,   ID_PWM0,      0,      13},
        {0,   ID_TWIHS0,    0,      14},
        {0,   ID_TWIHS0,    1,      15},
        {0,   ID_TWIHS1,    0,      16},
        {0,   ID_TWIHS1,    1,      17},
        {0,   ID_TWIHS2,    0,      18},
        {0,   ID_TWIHS2,    1,      19},
        {0,   ID_UART0,     0,      20},
        {0,   ID_UART0,     1,      21},
        {0,   ID_UART1,     0,      22},
        {0,   ID_UART1,     1,      23},
        {0,   ID_UART2,     0,      24},
        {0,   ID_UART2,     1,      25},
        {0,   ID_UART3,     0,      26},
        {0,   ID_UART3,     1,      27},
        {0,   ID_UART4,     0,      28},
        {0,   ID_UART4,     1,      29},
        {0,   ID_DACC,      0,      30},
        {0,   ID_DACC,      0,      31},
        {0,   ID_SSC,       0,      32},
        {0,   ID_SSC,       1,      33},
        {0,   ID_PIOA,      1,      34},
        {0,   ID_AFEC0,     1,      35},
        {0,   ID_AFEC1,     1,      36},
        {0,   ID_AES,       0,      37},
        {0,   ID_AES,       1,      38},
        {0,   ID_PWM1,      0,      39},
        {0,   ID_TC0,       1,      40},
        {0,   ID_TC1,       1,      41},
        {0,   ID_TC2,       1,      42},
        {0,   ID_TC3,       1,      43},
};


/*----------------------------------------------------------------------------
 *        Exported functions
 *----------------------------------------------------------------------------*/

/**
 * \brief Get peripheral identifier coded for hardware handshaking interface
 *
 * \param bDmac      DMA Controller number.
 * \param bPeriphID  Peripheral ID.
 * \param bTransfer  Transfer type 0: Tx, 1 :Rx.
 * \return 0-15 peripheral identifier coded.
 *         0xff : no associated peripheral identifier coded.
 */
uint8_t XDMAIF_Get_ChannelNumber (uint8_t bPeriphID,
                                                                  uint8_t bTransfer)
{
        uint8_t i;
        uint8_t NumOfPeripheral = ((XDMAC_GetType(XDMAC) & 0x00FF0000) >> 16);

        for (i = 0; i <= NumOfPeripheral; i++) {
                if ((xdmaHwIf[i].bPeriphID == bPeriphID) &&
                         (xdmaHwIf[i].bTransfer == bTransfer))
                        return xdmaHwIf[i].bIfID;
        }

        return 0xff;
}

/**
 * \brief Check if the given DMAC has associated peripheral identifier coded by
 * the given  peripheral.
 *
 * \param bDmac      DMA Controller number.
 * \param bPeriphID  Peripheral ID (0xff : memory only).
 * \return 1:  Is a validated peripheral. 0: no associated peripheral identifier
 * coded.
 */
uint8_t XDMAIF_IsValidatedPeripherOnDma(uint8_t bPeriphID)
{
        uint8_t i;
        uint8_t NumOfPeripheral = ((XDMAC_GetType(XDMAC) & 0x00FF0000) >> 16);

        /* It is always validated when transfer to memory */
        if (bPeriphID == 0xFF)
                return 1;

        for (i = 0; i <= NumOfPeripheral; i++) {
                if ((xdmaHwIf[i].bPeriphID == bPeriphID))
                        return 1;
        }

        return 0;
}