Diff: targets/hal/TARGET_Atmel/TARGET_SAM21/drivers/dma/dma_crc.h

Revision:

613:bc40b8d2aec4

Parent:

612:fba1c7dc54c0

Child:

614:9d86c2ae5de0

--- a/targets/hal/TARGET_Atmel/TARGET_SAM21/drivers/dma/dma_crc.h	Tue Aug 18 15:00:09 2015 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,185 +0,0 @@
-#ifndef DMA_CRC_H_INCLUDED
-#define DMA_CRC_H_INCLUDED
-
-#include <compiler.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/** DMA channel n offset. */
-#define DMA_CRC_CHANNEL_N_OFFSET 0x20
-
-/** CRC Polynomial Type. */
-enum crc_polynomial_type {
-    /** CRC16 (CRC-CCITT). */
-    CRC_TYPE_16,
-    /** CRC32 (IEEE 802.3). */
-    CRC_TYPE_32,
-};
-
-/** CRC Beat Type. */
-enum crc_beat_size {
-    /** Byte bus access. */
-    CRC_BEAT_SIZE_BYTE,
-    /** Half-word bus access. */
-    CRC_BEAT_SIZE_HWORD,
-    /** Word bus access. */
-    CRC_BEAT_SIZE_WORD,
-};
-
-/** Configurations for CRC calculation. */
-struct dma_crc_config {
-    /** CRC polynomial type. */
-    enum crc_polynomial_type type;
-    /** CRC beat size. */
-    enum crc_beat_size size;
-};
-
-/**
- * \brief Get DMA CRC default configurations.
- *
- * The default configuration is as follows:
- *  \li Polynomial type is set to CRC-16(CRC-CCITT)
- *  \li CRC Beat size: BYTE
- *
- * \param[in] config default configurations
- */
-static inline void dma_crc_get_config_defaults(struct dma_crc_config *config)
-{
-    Assert(config);
-
-    config->type = CRC_TYPE_16;
-    config->size = CRC_BEAT_SIZE_BYTE;
-}
-
-/**
- * \brief Enable DMA CRC module with an DMA channel.
- *
- * This function enables a CRC calculation with an allocated DMA channel. This channel ID
- * can be gotten from a successful \ref dma_allocate.
- *
- * \param[in] channel_id DMA channel expected with CRC calculation
- * \param[in] config CRC calculation configurations
- *
- * \return Status of the DMC CRC.
- * \retval STATUS_OK Get the DMA CRC module
- * \retval STATUS_BUSY DMA CRC module is already taken and not ready yet
- */
-static inline enum status_code dma_crc_channel_enable(uint32_t channel_id,
-        struct dma_crc_config *config)
-{
-    if (DMAC->CRCSTATUS.reg & DMAC_CRCSTATUS_CRCBUSY) {
-        return STATUS_BUSY;
-    }
-
-    DMAC->CRCCTRL.reg = DMAC_CRCCTRL_CRCBEATSIZE(config->size) |
-                        DMAC_CRCCTRL_CRCPOLY(config->type) |
-                        DMAC_CRCCTRL_CRCSRC(channel_id+DMA_CRC_CHANNEL_N_OFFSET);
-
-    DMAC->CTRL.reg |= DMAC_CTRL_CRCENABLE;
-
-    return STATUS_OK;
-}
-
-/**
- * \brief Disable DMA CRC module.
- *
- */
-static inline void dma_crc_disable(void)
-{
-    DMAC->CTRL.reg &= ~DMAC_CTRL_CRCENABLE;
-    DMAC->CRCCTRL.reg = 0;
-}
-
-/**
- * \brief Get DMA CRC checksum value.
- *
- * \return Calculated CRC checksum.
- */
-static inline uint32_t dma_crc_get_checksum(void)
-{
-    if (DMAC->CRCCTRL.bit.CRCSRC == DMAC_CRCCTRL_CRCSRC_IO_Val) {
-        DMAC->CRCSTATUS.reg = DMAC_CRCSTATUS_CRCBUSY;
-    }
-
-    return DMAC->CRCCHKSUM.reg;
-}
-
-/**
- * \brief Enable DMA CRC module with I/O.
- *
- * This function enables a CRC calculation with I/O mode.
- *
- * \param[in] config CRC calculation configurations.
- *
- * \return Status of the DMC CRC.
- * \retval STATUS_OK Get the DMA CRC module
- * \retval STATUS_BUSY DMA CRC module is already taken and not ready yet
- */
-static inline enum status_code dma_crc_io_enable(
-    struct dma_crc_config *config)
-{
-    if (DMAC->CRCSTATUS.reg & DMAC_CRCSTATUS_CRCBUSY) {
-        return STATUS_BUSY;
-    }
-
-    if (DMAC->CTRL.reg & DMAC_CTRL_CRCENABLE) {
-        return STATUS_BUSY;
-    }
-
-    DMAC->CRCCTRL.reg = DMAC_CRCCTRL_CRCBEATSIZE(config->size) |
-                        DMAC_CRCCTRL_CRCPOLY(config->type) |
-                        DMAC_CRCCTRL_CRCSRC_IO;
-
-    if (config->type == CRC_TYPE_32) {
-        DMAC->CRCCHKSUM.reg = 0xFFFFFFFF;
-    }
-
-    DMAC->CTRL.reg |= DMAC_CTRL_CRCENABLE;
-
-    return STATUS_OK;
-}
-
-/**
- * \brief Calculate CRC with I/O.
- *
- * This function calculate the CRC of the input data buffer.
- *
- * \param[in] buffer CRC Pointer to calculation buffer
- * \param[in] total_beat_size Total beat size to be calculated
- *
- * \return Calculated CRC checksum value.
- */
-static inline void dma_crc_io_calculation(void *buffer,
-        uint32_t total_beat_size)
-{
-    uint32_t counter = total_beat_size;
-    uint8_t *buffer_8;
-    uint16_t *buffer_16;
-    uint32_t *buffer_32;
-
-    for (counter=0; counter<total_beat_size; counter++) {
-        if (DMAC->CRCCTRL.bit.CRCBEATSIZE == CRC_BEAT_SIZE_BYTE) {
-            buffer_8 = buffer;
-            DMAC->CRCDATAIN.reg = buffer_8[counter];
-        } else if (DMAC->CRCCTRL.bit.CRCBEATSIZE == CRC_BEAT_SIZE_HWORD) {
-            buffer_16 = buffer;
-            DMAC->CRCDATAIN.reg = buffer_16[counter];
-        } else if (DMAC->CRCCTRL.bit.CRCBEATSIZE == CRC_BEAT_SIZE_WORD) {
-            buffer_32 = buffer;
-            DMAC->CRCDATAIN.reg = buffer_32[counter];
-        }
-        /* Wait several cycle to make sure CRC complete */
-        nop();
-        nop();
-        nop();
-        nop();
-    }
-}
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* DMA_CRC_H_INCLUDED */