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nuttx/arch/arm/src/sama5/sam_xdmac.c

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/****************************************************************************
* arch/arm/src/sama5/sam_xdmac.c
*
* Copyright (C) 2014, 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 NuttX 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 OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <semaphore.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include "up_arch.h"
#include "cache.h"
#include "up_internal.h"
#include "sched/sched.h"
#include "chip.h"
#include "sam_dmac.h"
#include "sam_periphclks.h"
#include "sam_memories.h"
#include "chip/sam_pmc.h"
#include "chip/sam_xdmac.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* All of the currently supported SAMA5 chips support two DMA controllers
* of 8 DMA Channels each.
*/
#if SAM_NDMAC < 1
# undef CONFIG_SAMA5_XDMAC1
# undef CONFIG_SAMA5_XDMAC0
#elif SAM_NDMAC < 2
# undef CONFIG_SAMA5_XDMAC1
#endif
/* Condition out the whole file unless DMA is selected in the configuration */
#if defined(CONFIG_SAMA5_XDMAC0) || defined(CONFIG_SAMA5_XDMAC1)
/* If SAMA5 DMA support is enabled, then OS DMA support should also be
* enabled
*/
#ifndef CONFIG_ARCH_DMA
# warning "SAMA5 DMA enabled but CONFIG_ARCH_DMA disabled"
#endif
/* Check the number of link list descriptors to allocate */
#ifndef CONFIG_SAMA5_NLLDESC
# define CONFIG_SAMA5_NLLDESC SAM_NDMACHAN
#endif
#if CONFIG_SAMA5_NLLDESC < SAM_NDMACHAN
# warning "At least SAM_NDMACHAN descriptors must be allocated"
# undef CONFIG_SAMA5_NLLDESC
# define CONFIG_SAMA5_NLLDESC SAM_NDMACHAN
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure maps a peripheral ID to an DMA channel */
struct sam_pidmap_s
{
uint8_t pid; /* Peripheral identifier */
uint8_t pchan; /* DMA channel */
};
/* This structure describes one DMA channel */
struct sam_xdmach_s
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
uint8_t xdmac; /* DMA controller number (0-1) */
#endif
uint8_t chan; /* DMA channel number (0-15) */
bool inuse; /* TRUE: The DMA channel is in use */
bool rx; /* TRUE: Peripheral to memory transfer */
uint32_t flags; /* DMA channel flags */
uint32_t base; /* DMA register channel base address */
uint32_t cc; /* Pre-calculated CC register for transfer */
dma_callback_t callback; /* Callback invoked when the DMA completes */
void *arg; /* Argument passed to callback function */
uint32_t rxaddr; /* RX memory address to be invalidated */
size_t rxsize; /* Size of RX memory region */
struct chnext_view1_s *llhead; /* DMA link list head */
struct chnext_view1_s *lltail; /* DMA link list head */
};
/* This structure describes the state of one DMA controller */
struct sam_xdmac_s
{
/* These semaphores protect the DMA channel and descriptor tables */
sem_t chsem; /* Protects channel table */
sem_t dsem; /* Protects descriptor table */
uint32_t base; /* DMA register channel base address */
/* This array describes the available link list descriptors */
struct chnext_view1_s *descr;
/* This array describes each DMA channel */
struct sam_xdmach_s *xdmach;
};
/****************************************************************************
* Private Data
****************************************************************************/
/* Channel Control (CC) Register field lookups */
static const uint32_t g_chanwidth[4] =
{
XDMACH_CC_DWIDTH_BYTE,
XDMACH_CC_DWIDTH_HWORD,
XDMACH_CC_DWIDTH_WORD,
XDMACH_CC_DWIDTH_DWORD
};
/* These tables map peripheral IDs to channels. A lookup is performed
* before each DMA transfer in order to map the peripheral IDs to the
* correct channel. This must be done because the channel can change with
* the direction of the transfer.
*/
#ifdef CONFIG_SAMA5_XDMAC0
/* DMA controller 0, RX DMA: */
static const struct sam_pidmap_s g_xdmac0_rxchan[] =
{
{ SAM_PID_HSMCI0, XDMAC0_CH_HSMCI0 }, /* HSMCI0 Receive/Transmit */
{ SAM_PID_HSMCI1, XDMAC0_CH_HSMCI1 }, /* HSMCI1 Receive/Transmit */
{ SAM_PID_TWI0, XDMAC0_CH_TWI0_RX }, /* TWI0 Receive */
{ SAM_PID_TWI1, XDMAC0_CH_TWI1_RX }, /* TWI1 Receive */
{ SAM_PID_TWI2, XDMAC0_CH_TWI2_RX }, /* TWI2 Receive */
{ SAM_PID_TWI3, XDMAC0_CH_TWI3_RX }, /* TWI3 Receive */
{ SAM_PID_SPI0, XDMAC0_CH_SPI0_RX }, /* SPI0 Receive */
{ SAM_PID_SPI1, XDMAC0_CH_SPI1_RX }, /* SPI1 Receive */
{ SAM_PID_SPI2, XDMAC0_CH_SPI2_RX }, /* SPI2 Receive */
{ SAM_PID_USART2, XDMAC0_CH_USART2_RX }, /* USART2 Receive */
{ SAM_PID_USART3, XDMAC0_CH_USART3_RX }, /* USART3 Receive */
{ SAM_PID_USART4, XDMAC0_CH_USART4_RX }, /* USART4 Receive */
{ SAM_PID_UART0, XDMAC0_CH_UART0_RX }, /* UART0 Receive */
{ SAM_PID_UART1, XDMAC0_CH_UART1_RX }, /* UART1 Receive */
{ SAM_PID_SSC0, XDMAC0_CH_SSC0_RX }, /* SSC0 Receive */
{ SAM_PID_SSC1, XDMAC0_CH_SSC1_RX }, /* SSC1 Receive */
{ SAM_PID_DBGU, XDMAC0_CH_DBGU_RX }, /* DBGU Receive */
{ SAM_PID_ADC, XDMAC0_CH_ADC_RX }, /* ADC Receive */
{ SAM_PID_SMD, XDMAC0_CH_SMD_RX }, /* SMD Receive */
{ SAM_PID_USART0, XDMAC0_CH_USART0_RX }, /* USART0 Receive */
{ SAM_PID_USART1, XDMAC0_CH_USART1_RX }, /* USART1 Receive */
{ SAM_PID_AES, XDMAC0_CH_AES_RX }, /* AES Receive */
{ SAM_PID_TDES, XDMAC0_CH_TDES_RX }, /* TDES Receive */
{ SAM_PID_CATB, XDMAC0_CH_CATB_RX }, /* CATB Receive */
};
#define NXDMAC0_RXCHANNELS (sizeof(g_xdmac0_rxchan) / sizeof(struct sam_pidmap_s))
/* DMA controller 0, TX DMA: */
static const struct sam_pidmap_s g_xdmac0_txchan[] =
{
{ SAM_PID_HSMCI0, XDMAC0_CH_HSMCI0 }, /* HSMCI0 Receive/Transmit */
{ SAM_PID_HSMCI1, XDMAC0_CH_HSMCI1 }, /* HSMCI1 Receive/Transmit */
{ SAM_PID_TWI0, XDMAC0_CH_TWI0_TX }, /* TWI0 Transmit */
{ SAM_PID_TWI1, XDMAC0_CH_TWI1_TX }, /* TWI1 Transmit */
{ SAM_PID_TWI2, XDMAC0_CH_TWI2_TX }, /* TWI2 Transmit */
{ SAM_PID_TWI3, XDMAC0_CH_TWI3_TX }, /* TWI3 Transmit */
{ SAM_PID_SPI0, XDMAC0_CH_SPI0_TX }, /* SPI0 Transmit */
{ SAM_PID_SPI1, XDMAC0_CH_SPI1_TX }, /* SPI1 Transmit */
{ SAM_PID_SPI2, XDMAC0_CH_SPI2_TX }, /* SPI2 Transmit */
{ SAM_PID_USART2, XDMAC0_CH_USART2_TX }, /* USART2 Transmit */
{ SAM_PID_USART3, XDMAC0_CH_USART3_TX }, /* USART3 Transmit */
{ SAM_PID_USART4, XDMAC0_CH_USART4_TX }, /* USART4 Transmit */
{ SAM_PID_UART0, XDMAC0_CH_UART0_TX }, /* UART0 Transmit */
{ SAM_PID_UART1, XDMAC0_CH_UART1_TX }, /* UART1 Transmit */
{ SAM_PID_SSC0, XDMAC0_CH_SSC0_TX }, /* SSC0 Transmit */
{ SAM_PID_SSC1, XDMAC0_CH_SSC1_TX }, /* SSC1 Transmit */
{ SAM_PID_DBGU, XDMAC0_CH_DBGU_TX }, /* DBGU Transmit */
{ SAM_PID_SMD, XDMAC0_CH_SMD_TX }, /* SMD Transmit */
{ SAM_PID_USART0, XDMAC0_CH_USART0_TX }, /* USART0 Transmit */
{ SAM_PID_USART1, XDMAC0_CH_USART1_TX }, /* USART1 Transmit */
{ SAM_PID_AES, XDMAC0_CH_AES_TX }, /* AES Transmit */
{ SAM_PID_TDES, XDMAC0_CH_TDES_TX }, /* TDES Transmit */
{ SAM_PID_SHA, XDMAC0_CH_SHA_TX }, /* SHA Transmit */
{ SAM_PID_CATB, XDMAC0_CH_CATB_TX }, /* CATB Transmit */
};
#define NXDMAC0_TXCHANNELS (sizeof(g_xdmac0_txchan) / sizeof(struct sam_pidmap_s))
#endif
#ifdef CONFIG_SAMA5_XDMAC1
/* DMA controller 1, RX DMA: */
static const struct sam_pidmap_s g_xdmac1_rxchan[] =
{
{ SAM_PID_HSMCI0, XDMAC1_CH_HSMCI0 }, /* HSMCI0 Receive/Transmit */
{ SAM_PID_HSMCI1, XDMAC1_CH_HSMCI1 }, /* HSMCI1 Receive/Transmit */
{ SAM_PID_TWI0, XDMAC1_CH_TWI0_RX }, /* TWI0 Receive */
{ SAM_PID_TWI1, XDMAC1_CH_TWI1_RX }, /* TWI1 Receive */
{ SAM_PID_TWI2, XDMAC1_CH_TWI2_RX }, /* TWI2 Receive */
{ SAM_PID_TWI3, XDMAC1_CH_TWI3_RX }, /* TWI3 Receive */
{ SAM_PID_SPI0, XDMAC1_CH_SPI0_RX }, /* SPI0 Receive */
{ SAM_PID_SPI1, XDMAC1_CH_SPI1_RX }, /* SPI1 Receive */
{ SAM_PID_SPI2, XDMAC1_CH_SPI2_RX }, /* SPI2 Receive */
{ SAM_PID_USART2, XDMAC1_CH_USART2_RX }, /* USART2 Receive */
{ SAM_PID_USART3, XDMAC1_CH_USART3_RX }, /* USART3 Receive */
{ SAM_PID_USART4, XDMAC1_CH_USART4_RX }, /* USART4 Receive */
{ SAM_PID_UART0, XDMAC1_CH_UART0_RX }, /* UART0 Receive */
{ SAM_PID_UART1, XDMAC1_CH_UART1_RX }, /* UART1 Receive */
{ SAM_PID_SSC0, XDMAC1_CH_SSC0_RX }, /* SSC0 Receive */
{ SAM_PID_SSC1, XDMAC1_CH_SSC1_RX }, /* SSC1 Receive */
{ SAM_PID_DBGU, XDMAC1_CH_DBGU_RX }, /* DBGU Receive */
{ SAM_PID_ADC, XDMAC1_CH_ADC_RX }, /* ADC Receive */
{ SAM_PID_SMD, XDMAC1_CH_SMD_RX }, /* SMD Receive */
};
#define NXDMAC1_RXCHANNELS (sizeof(g_xdmac1_rxchan) / sizeof(struct sam_pidmap_s))
/* DMA controller 1, TX DMA: */
static const struct sam_pidmap_s g_xdmac1_txchan[] =
{
{ SAM_PID_HSMCI0, XDMAC1_CH_HSMCI0 }, /* HSMCI0 Receive/Transmit */
{ SAM_PID_HSMCI1, XDMAC1_CH_HSMCI1 }, /* HSMCI1 Receive/Transmit */
{ SAM_PID_TWI0, XDMAC1_CH_TWI0_TX }, /* TWI0 Transmit */
{ SAM_PID_TWI1, XDMAC1_CH_TWI1_TX }, /* TWI1 Transmit */
{ SAM_PID_TWI2, XDMAC1_CH_TWI2_TX }, /* TWI2 Transmit */
{ SAM_PID_TWI3, XDMAC1_CH_TWI3_TX }, /* TWI3 Transmit */
{ SAM_PID_SPI0, XDMAC1_CH_SPI0_TX }, /* SPI0 Transmit */
{ SAM_PID_SPI1, XDMAC1_CH_SPI1_TX }, /* SPI1 Transmit */
{ SAM_PID_SPI2, XDMAC1_CH_SPI2_TX }, /* SPI2 Transmit */
{ SAM_PID_USART2, XDMAC1_CH_USART2_TX }, /* USART2 Transmit */
{ SAM_PID_USART3, XDMAC1_CH_USART3_TX }, /* USART3 Transmit */
{ SAM_PID_USART4, XDMAC1_CH_USART4_TX }, /* USART4 Transmit */
{ SAM_PID_UART0, XDMAC1_CH_UART0_TX }, /* UART0 Transmit */
{ SAM_PID_UART1, XDMAC1_CH_UART1_TX }, /* UART1 Transmit */
{ SAM_PID_SSC0, XDMAC1_CH_SSC0_TX }, /* SSC0 Transmit */
{ SAM_PID_SSC1, XDMAC1_CH_SSC1_TX }, /* SSC1 Transmit */
{ SAM_PID_DBGU, XDMAC1_CH_DBGU_TX }, /* DBGU Transmit */
{ SAM_PID_SMD, XDMAC1_CH_SMD_TX }, /* SMD Transmit */
};
#define NXDMAC1_TXCHANNELS (sizeof(g_xdmac1_txchan) / sizeof(struct sam_pidmap_s))
#endif
#ifdef CONFIG_SAMA5_XDMAC0
/* This array describes the available link list descriptors */
struct chnext_view1_s g_desc0[CONFIG_SAMA5_NLLDESC];
/* This array describes the state of each XDMAC0 channel 0 */
static struct sam_xdmach_s g_xdmach0[SAM_NDMACHAN] =
{
#if SAM_NDMACHAN > 0
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 0,
.base = SAM_XDMAC0_CH0_BASE,
},
#endif
#if SAM_NDMACHAN > 1
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 1,
.base = SAM_XDMAC0_CH1_BASE,
},
#endif
#if SAM_NDMACHAN > 2
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 2,
.base = SAM_XDMAC0_CH2_BASE,
},
#endif
#if SAM_NDMACHAN > 3
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 3,
.base = SAM_XDMAC0_CH3_BASE,
},
#endif
#if SAM_NDMACHAN > 4
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 4,
.base = SAM_XDMAC0_CH4_BASE,
},
#endif
#if SAM_NDMACHAN > 5
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 5,
.base = SAM_XDMAC0_CH5_BASE,
},
#endif
#if SAM_NDMACHAN > 6
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 6,
.base = SAM_XDMAC0_CH6_BASE,
},
#endif
#if SAM_NDMACHAN > 7
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 7,
.base = SAM_XDMAC0_CH7_BASE,
},
#endif
#if SAM_NDMACHAN > 8
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 8,
.base = SAM_XDMAC0_CH8_BASE,
},
#endif
#if SAM_NDMACHAN > 9
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 9,
.base = SAM_XDMAC0_CH9_BASE,
},
#endif
#if SAM_NDMACHAN > 10
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 10,
.base = SAM_XDMAC0_CH10_BASE,
},
#endif
#if SAM_NDMACHAN > 11
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 11,
.base = SAM_XDMAC0_CH11_BASE,
},
#endif
#if SAM_NDMACHAN > 12
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 12,
.base = SAM_XDMAC0_CH12_BASE,
},
#endif
#if SAM_NDMACHAN > 13
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 13,
.base = SAM_XDMAC0_CH13_BASE,
},
#endif
#if SAM_NDMACHAN > 14
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 14,
.base = SAM_XDMAC0_CH14_BASE,
},
#endif
#if SAM_NDMACHAN > 15
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 0,
#endif
.chan = 15,
.base = SAM_XDMAC0_CH15_BASE,
}
#endif
};
/* This describes the overall state of DMA controller 0 */
static struct sam_xdmac_s g_xdmac0 =
{
/* XDMAC 0 base address */
.base = SAM_XDMAC0_VBASE,
/* This array describes the available link list descriptors */
.descr = g_desc0,
/* This array describes each DMA channel */
.xdmach = g_xdmach0,
};
#endif /* CONFIG_SAMA5_XDMAC0 */
/* This array describes the state of DMA controller 1 */
#ifdef CONFIG_SAMA5_XDMAC1
/* This array describes the available link list descriptors */
struct chnext_view1_s g_desc1[CONFIG_SAMA5_NLLDESC];
static struct sam_xdmach_s g_xdmach1[SAM_NDMACHAN] =
{
#if SAM_NDMACHAN > 0
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 0,
.base = SAM_XDMAC1_CH0_BASE,
},
#endif
#if SAM_NDMACHAN > 1
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 1,
.base = SAM_XDMAC1_CH1_BASE,
},
#endif
#if SAM_NDMACHAN > 2
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 2,
.base = SAM_XDMAC1_CH2_BASE,
},
#endif
#if SAM_NDMACHAN > 3
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 3,
.base = SAM_XDMAC1_CH3_BASE,
},
#endif
#if SAM_NDMACHAN > 4
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 4,
.base = SAM_XDMAC1_CH4_BASE,
},
#endif
#if SAM_NDMACHAN > 5
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 5,
.base = SAM_XDMAC1_CH5_BASE,
},
#endif
#if SAM_NDMACHAN > 6
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 6,
.base = SAM_XDMAC1_CH6_BASE,
},
#endif
#if SAM_NDMACHAN > 7
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 7,
.base = SAM_XDMAC1_CH7_BASE,
},
#endif
#if SAM_NDMACHAN > 8
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 8,
.base = SAM_XDMAC1_CH8_BASE,
},
#endif
#if SAM_NDMACHAN > 9
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 9,
.base = SAM_XDMAC1_CH9_BASE,
},
#endif
#if SAM_NDMACHAN > 10
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 10,
.base = SAM_XDMAC1_CH10_BASE,
},
#endif
#if SAM_NDMACHAN > 11
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 11,
.base = SAM_XDMAC1_CH11_BASE,
},
#endif
#if SAM_NDMACHAN > 12
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 12,
.base = SAM_XDMAC1_CH12_BASE,
},
#endif
#if SAM_NDMACHAN > 13
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 13,
.base = SAM_XDMAC1_CH13_BASE,
},
#endif
#if SAM_NDMACHAN > 14
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 14,
.base = SAM_XDMAC1_CH14_BASE,
},
#endif
#if SAM_NDMACHAN > 15
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
.xdmac = 1,
#endif
.chan = 15,
.base = SAM_XDMAC1_CH15_BASE,
}
#endif
};
/* This describes the overall state of DMA controller 1 */
static struct sam_xdmac_s g_xdmac1 =
{
/* XDMAC 0 base address */
.base = SAM_XDMAC1_VBASE,
/* This array describes the available link list descriptors */
.descr = g_desc1,
/* This array describes each DMA channel */
.xdmach = g_xdmach1,
};
#endif /* CONFIG_SAMA5_XDMAC1 */
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: sam_takechsem() and sam_givechsem()
*
* Description:
* Used to get exclusive access to the DMA channel table
*
****************************************************************************/
static void sam_takechsem(struct sam_xdmac_s *xdmac)
{
/* Take the semaphore (perhaps waiting) */
while (sem_wait(&xdmac->chsem) != 0)
{
/* The only case that an error should occur here is if the wait was
* awakened by a signal.
*/
ASSERT(errno == EINTR);
}
}
static inline void sam_givechsem(struct sam_xdmac_s *xdmac)
{
(void)sem_post(&xdmac->chsem);
}
/****************************************************************************
* Name: sam_takedsem() and sam_givedsem()
*
* Description:
* Used to wait for availability of descriptors in the descriptor table.
*
****************************************************************************/
static void sam_takedsem(struct sam_xdmac_s *xdmac)
{
/* Take the semaphore (perhaps waiting) */
while (sem_wait(&xdmac->dsem) != 0)
{
/* The only case that an error should occur here is if the wait was
* awakened by a signal.
*/
ASSERT(errno == EINTR);
}
}
static inline void sam_givedsem(struct sam_xdmac_s *xdmac)
{
(void)sem_post(&xdmac->dsem);
}
/****************************************************************************
* Name: sam_getdmac
*
* Description:
* Read a global XDMAC register
*
****************************************************************************/
static inline uint32_t sam_getdmac(struct sam_xdmac_s *xdmac,
unsigned int offset)
{
return getreg32(xdmac->base + offset);
}
/****************************************************************************
* Name: sam_putdmac
*
* Description:
* Write a value to a global XDMAC register
*
****************************************************************************/
static inline void sam_putdmac(struct sam_xdmac_s *xdmac, uint32_t value,
unsigned int offset)
{
putreg32(value, xdmac->base + offset);
}
/****************************************************************************
* Name: sam_getdmach
*
* Description:
* Read a XDMAC channel register
*
****************************************************************************/
static inline uint32_t sam_getdmach(struct sam_xdmach_s *xdmach,
unsigned int offset)
{
return getreg32(xdmach->base + offset);
}
/****************************************************************************
* Name: sam_putdmach
*
* Description:
* Write a value to a XDMAC channel register
*
****************************************************************************/
static inline void sam_putdmach(struct sam_xdmach_s *xdmach, uint32_t value,
unsigned int offset)
{
putreg32(value, xdmach->base + offset);
}
/****************************************************************************
* Name: sam_controller
*
* Description:
* Given a DMA channel instance, return a pointer to the parent DMA
* controller instance.
*
****************************************************************************/
static inline struct sam_xdmac_s *sam_controller(struct sam_xdmach_s *xdmach)
{
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
return xdmach->xdmac ? &g_xdmac1 : &g_xdmac0;
#elif defined(CONFIG_SAMA5_XDMAC0)
return &g_xdmac0;
#else
return &g_xdmac1;
#endif
}
/****************************************************************************
* Name: sam_channel, sam_source_channel, and sam_sink_channel
*
* Description:
* Return the RX or TX channel associated with a PID. As a clarification:
*
* The source channel refers to the source of data for the DMA. This is,
* either (1) memory for a TX DMA or (2) a peripheral register for an RX
* DMA.
*
* The sink channel is the recipient of the DMA data. This is either
* (1) memory for an RX DMA, or (2) a peripheral register for a TX DMA.
*
****************************************************************************/
static uint8_t sam_channel(uint8_t pid, const struct sam_pidmap_s *table,
unsigned int nentries)
{
int i;
/* Search until either the entry with the matching PID is found or until
* all of the table entries have been examined without finding the PID.
*/
for (i = 0; i < nentries; i++, table++)
{
if (table->pid == pid)
{
return table->pchan;
}
}
dmadbg("No channel found for pid %d\n", pid);
DEBUGPANIC();
return 0x3f;
}
static uint32_t sam_source_channel(struct sam_xdmach_s *xdmach, uint8_t pid)
{
const struct sam_pidmap_s *table;
unsigned int nentries;
#ifdef CONFIG_SAMA5_XDMAC0
#ifdef CONFIG_SAMA5_XDMAC1
if (xdmach->xdmac == 0)
#endif
{
/* Use the XDMAC0 lookup table */
table = g_xdmac0_rxchan;
nentries = NXDMAC0_RXCHANNELS;
}
#endif
#ifdef CONFIG_SAMA5_XDMAC1
#ifdef CONFIG_SAMA5_XDMAC0
else
#endif
{
/* Use the XDMAC1 lookup table */
table = g_xdmac1_rxchan;
nentries = NXDMAC1_RXCHANNELS;
}
#endif
return (uint32_t)sam_channel(pid, table, nentries);
}
static uint32_t sam_sink_channel(struct sam_xdmach_s *xdmach, uint8_t pid)
{
const struct sam_pidmap_s *table;
unsigned int nentries;
#ifdef CONFIG_SAMA5_XDMAC0
#ifdef CONFIG_SAMA5_XDMAC1
if (xdmach->xdmac == 0)
#endif
{
/* Use the XDMAC0 lookup table */
table = g_xdmac0_txchan;
nentries = NXDMAC0_TXCHANNELS;
}
#endif
#ifdef CONFIG_SAMA5_XDMAC1
#ifdef CONFIG_SAMA5_XDMAC0
else
#endif
{
/* Use the XDMAC1 lookup table */
table = g_xdmac1_txchan;
nentries = NXDMAC1_TXCHANNELS;
}
#endif
return (uint32_t)sam_channel(pid, table, nentries);
}
/****************************************************************************
* Name: sam_maxtransfer
*
* Description:
* Maximum number of bytes that can be sent in one transfer
*
****************************************************************************/
static size_t sam_maxtransfer(struct sam_xdmach_s *xdmach)
{
unsigned int xfrwidth;
size_t maxtransfer;
/* Get the maximum transfer size in bytes */
xfrwidth = (xdmach->flags & DMACH_FLAG_PERIPHWIDTH_MASK) >>
DMACH_FLAG_PERIPHWIDTH_SHIFT;
switch (xfrwidth)
{
default:
case 0: /* 8 bits, 1 byte */
maxtransfer = XDMACH_CUBC_UBLEN_MAX;
break;
case 1: /* 16 bits, 2 bytes */
maxtransfer = 2 * XDMACH_CUBC_UBLEN_MAX;
break;
case 2: /* 32 bits 4 bytes */
maxtransfer = 4 * XDMACH_CUBC_UBLEN_MAX;
break;
case 3: /* 64 bits, 8 bytes */
maxtransfer = 8 * XDMACH_CUBC_UBLEN_MAX;
break;
}
return maxtransfer;
}
/****************************************************************************
* Name: sam_ntxtransfers
*
* Description:
* Number of TX transfers via DMA
*
****************************************************************************/
static uint32_t sam_ntxtransfers(struct sam_xdmach_s *xdmach,
uint32_t dmasize)
{
unsigned int srcwidth;
/* Adjust the source transfer size for the source chunk size (memory
* chunk size). BTSIZE is "the number of transfers to be performed, that
* is, for writes it refers to the number of source width transfers
* to perform when XDMAC is flow controller. For Reads, BTSIZE refers to
* the number of transfers completed on the Source Interface. ..."
*/
srcwidth = (xdmach->flags & DMACH_FLAG_PERIPHWIDTH_MASK) >>
DMACH_FLAG_PERIPHWIDTH_SHIFT;
switch (srcwidth)
{
default:
case 0: /* 8 bits, 1 byte */
break;
case 1: /* 16 bits, 2 bytes */
dmasize = (dmasize + 1) >> 1;
break;
case 2: /* 32 bits, 4 bytes */
dmasize = (dmasize + 3) >> 2;
break;
case 3: /* 64 bits, 8 bytes */
dmasize = (dmasize + 7) >> 3;
break;
}
return dmasize;
}
/****************************************************************************
* Name: sam_cubc
*
* Description:
* Calculate the CUBC transfer size
*
****************************************************************************/
static inline uint32_t sam_cubc(struct sam_xdmach_s *xdmach,
uint32_t dmasize)
{
uint32_t ntransfers;
/* Set the buffer transfer size field. This is the number of transfers to
* be performed, that is, the number of source width transfers to perform.
*/
ntransfers = sam_ntxtransfers(xdmach, dmasize);
DEBUGASSERT(ntransfers <= XDMACH_CUBC_UBLEN_MAX);
return (ntransfers << XDMACH_CUBC_UBLEN_SHIFT);
}
/****************************************************************************
* Name: sam_txcc
*
* Description:
* Decode the flags to get the correct Channel Control (CC) Register bit
* settings for a transmit (memory to peripheral) transfer.
*
* Single Block:
* 1. Clear TYPE for a memory to memory transfer, otherwise set
* this bit for memory to/from peripheral transfer.
* 2. Program MBSIZE to the memory burst size used.
* 3. Program SAM/DAM to the memory addressing scheme.
* 4. Program SYNC to select the peripheral transfer direction.
* 5. Set PROT to activate a secure channel.
* 6. Program CSIZE to configure the channel chunk size (only
* relevant for peripheral synchronized transfer).
* 7. Program DWIDTH to configure the transfer data width.
* 8. Program SIF, DIF to configure the master interface
* used to read data and write data respectively.
* 9. Program PERID to select the active hardware request line
* (only relevant for a peripheral synchronized transfer).
* 10. Set SWREQ to use software request (only relevant for a
* peripheral synchronized transfer).
*
****************************************************************************/
static inline uint32_t sam_txcc(struct sam_xdmach_s *xdmach)
{
uint32_t regval = 0;
uint32_t field;
/* 1. Clear TYPE for a memory to memory transfer, otherwise set
* this bit for memory to/from peripheral transfer.
*
* By convention, TX refers to a memory to peripheral transfer. So the
* source is memory. Is the "peripheral" destination a peripheral? or
* it is really memory?
*/
if ((xdmach->flags & DMACH_FLAG_PERIPHISPERIPH) != 0)
{
/* Yes.. Use peripheral synchronized mode */
regval |= XDMACH_CC_TYPE;
}
/* 2. Program MBSIZE to the memory burst size used.
*
* NOTE: This assumes the same encoding in the DMACH flags as in the CC
* register MBSIZE field.
*/
field = (xdmach->flags & DMACH_FLAG_MEMBURST_MASK) >>
DMACH_FLAG_MEMBURST_SHIFT;
regval |= (field << XDMACH_CC_MBSIZE_SHIFT);
/* 3. Program SAM/DAM to the memory addressing scheme.
*
* NOTE: This assumes that 0 means non-incrementing.
* TX -> Source is memory.
*/
if ((xdmach->flags & DMACH_FLAG_MEMINCREMENT) != 0)
{
regval |= XDMACH_CC_SAM_INCR;
}
/* TX -> Destination is peripheral. */
if ((xdmach->flags & DMACH_FLAG_PERIPHINCREMENT) != 0)
{
regval |= XDMACH_CC_DAM_INCR;
}
/* 4. Program DSYNC to select the peripheral transfer direction.
*
* TX -> Memory to peripheral
*/
regval |= XDMACH_CC_DSYNC;
#if 0 /* REVISIT */
/* 5. Set PROT to activate a secure channel (REVISIT). */
regval |= XDMACH_CC_PROT; /* Channel is unsecured */
#endif
/* 6. Program CSIZE to configure the channel chunk size (only
* relevant for peripheral synchronized transfer).
*/
if ((xdmach->flags & DMACH_FLAG_PERIPHISPERIPH) != 0)
{
/* Peripheral synchronized mode -- set chunk size.
* NOTE that we assume that encoding in the XDMACH flags is the same
* as in the CC register CSIZE field.
*/
field = (xdmach->flags & DMACH_FLAG_PERIPHCHUNKSIZE_MASK) >>
DMACH_FLAG_PERIPHCHUNKSIZE_SHIFT;
regval |= (field << XDMACH_CC_CSIZE_SHIFT);
}
/* 7. Program DWIDTH to configure the transfer data width.
*
* NOTE that we assume that encoding in the XDMACH flags is the same as in
* the CC register CSIZE field.
*/
field = (xdmach->flags & DMACH_FLAG_PERIPHWIDTH_MASK) >>
DMACH_FLAG_PERIPHWIDTH_SHIFT;
regval |= (field << XDMACH_CC_DWIDTH_SHIFT);
/* 8. Program SIF, DIF to configure the master interface
* used to read data and write data respectively.
*
* TX -> Source is memory
*/
if ((xdmach->flags & DMACH_FLAG_MEMAHB_MASK) == DMACH_FLAG_MEMAHB_AHB_IF1)
{
regval |= XDMACH_CC_SIF;
}
/* TX -> Destination is peripheral */
if ((xdmach->flags & DMACH_FLAG_PERIPHAHB_MASK) == DMACH_FLAG_PERIPHAHB_AHB_IF1)
{
regval |= XDMACH_CC_DIF;
}
/* 9. Program PERID to select the active hardware request line
* (only relevant for a peripheral synchronized transfer).
*/
if ((xdmach->flags & DMACH_FLAG_PERIPHISPERIPH) != 0)
{
int pid;
/* Get the PID from the DMACH flags */
pid = (xdmach->flags & DMACH_FLAG_PERIPHPID_MASK) >>
DMACH_FLAG_PERIPHPID_SHIFT;
/* Look up the DMA channel code for TX: Peripheral is the sink. */
field = sam_sink_channel(xdmach, pid);
regval |= (field << XDMACH_CC_CSIZE_SHIFT);
#if 0 /* Not supported */
/* 10. Set SWREQ to use software request (only relevant for a
* peripheral synchronized transfer).
*/
regval |= XDMACH_CC_SWREQ;
#endif
}
return regval;
}
/****************************************************************************
* Name: sam_rxcc
*
* Description:
* Decode the flags to get the correct Channel Control (CC) Register bit
* settings for a receive (peripheral to memory) transfer.
*
* 1. Clear TYPE for a memory to memory transfer, otherwise set
* this bit for memory to/from peripheral transfer.
* 2. Program MBSIZE to the memory burst size used.
* 3. Program SAM/DAM to the memory addressing scheme.
* 4. Program SYNC to select the peripheral transfer direction.
* 5. Set PROT to activate a secure channel.
* 6. Program CSIZE to configure the channel chunk size (only
* relevant for peripheral synchronized transfer).
* 7. Program DWIDTH to configure the transfer data width.
* 8. Program SIF, DIF to configure the master interface
* used to read data and write data respectively.
* 9. Program PERID to select the active hardware request line
* (only relevant for a peripheral synchronized transfer).
* 10. Set SWREQ to use software request (only relevant for a
* peripheral synchronized transfer).
*
****************************************************************************/
static inline uint32_t sam_rxcc(struct sam_xdmach_s *xdmach)
{
uint32_t regval = 0;
uint32_t field;
/* 1. Clear TYPE for a memory to memory transfer, otherwise set
* this bit for memory to/from peripheral transfer.
*
* By convention, RX refers to a peripheral to memory transfer. So the
* source is peripheral. Is the "peripheral" source a peripheral? or
* is it also memory?
*/
if ((xdmach->flags & DMACH_FLAG_PERIPHISPERIPH) != 0)
{
/* Yes.. Use peripheral synchronized mode */
regval |= XDMACH_CC_TYPE;
}
/* 2. Program MBSIZE to the memory burst size used.
*
* NOTE: This assumes the same encoding in the DMACH flags as in the CC
* register MBSIZE field.
*/
field = (xdmach->flags & DMACH_FLAG_MEMBURST_MASK) >>
DMACH_FLAG_MEMBURST_SHIFT;
regval |= (field << XDMACH_CC_MBSIZE_SHIFT);
/* 3. Program SAM/DAM to the memory addressing scheme.
*
* NOTE: This assumes that 0 means non-incrementing.
* RX -> Source is peripheral.
*/
if ((xdmach->flags & DMACH_FLAG_PERIPHINCREMENT) != 0)
{
regval |= XDMACH_CC_SAM_INCR;
}
/* RX -> Destination is memory. */
if ((xdmach->flags & DMACH_FLAG_MEMINCREMENT) != 0)
{
regval |= XDMACH_CC_DAM_INCR;
}
/* 4. Program DSYNC to select the peripheral transfer direction.
*
* RX -> Peripheral to memory (DSYNC == 0)
*/
#if 0 /* REVISIT */
/* 5. Set PROT to activate a secure channel (REVISIT) */
regval |= XDMACH_CC_PROT; /* Channel is unsecured */
#endif
/* 6. Program CSIZE to configure the channel chunk size (only
* relevant for peripheral synchronized transfer).
*/
if ((xdmach->flags & DMACH_FLAG_PERIPHISPERIPH) != 0)
{
/* Peripheral synchronized mode -- set chunk size.
* NOTE that we assume that encoding in the XDMACH flags is the same
* as in the CC register CSIZE field.
*/
field = (xdmach->flags & DMACH_FLAG_PERIPHCHUNKSIZE_MASK) >>
DMACH_FLAG_PERIPHCHUNKSIZE_SHIFT;
regval |= (field << XDMACH_CC_CSIZE_SHIFT);
}
/* 7. Program DWIDTH to configure the transfer data width.
*
* NOTE that we assume that encoding in the XDMACH flags is the same as in
* the CC register CSIZE field.
*/
field = (xdmach->flags & DMACH_FLAG_PERIPHWIDTH_MASK) >>
DMACH_FLAG_PERIPHWIDTH_SHIFT;
regval |= (field << XDMACH_CC_DWIDTH_SHIFT);
/* 8. Program SIF, DIF to configure the master interface
* used to read data and write data respectively.
*
* RX -> Source is peripheral
*/
if ((xdmach->flags & DMACH_FLAG_PERIPHAHB_MASK) == DMACH_FLAG_PERIPHAHB_AHB_IF1)
{
regval |= XDMACH_CC_SIF;
}
/* RX -> Destination is memory */
if ((xdmach->flags & DMACH_FLAG_MEMAHB_MASK) == DMACH_FLAG_MEMAHB_AHB_IF1)
{
regval |= XDMACH_CC_DIF;
}
/* 9. Program PERID to select the active hardware request line
* (only relevant for a peripheral synchronized transfer).
*/
if ((xdmach->flags & DMACH_FLAG_PERIPHISPERIPH) != 0)
{
int pid;
/* Get the PID from the DMACH flags */
pid = (xdmach->flags & DMACH_FLAG_PERIPHPID_MASK) >>
DMACH_FLAG_PERIPHPID_SHIFT;
/* Look up the DMA channel code for RX: Peripheral is the source. */
field = sam_source_channel(xdmach, pid);
regval |= (field << XDMACH_CC_CSIZE_SHIFT);
#if 0 /* Not supported */
/* 10. Set SWREQ to use software request (only relevant for a
* peripheral synchronized transfer).
*/
regval |= XDMACH_CC_SWREQ;
#endif
}
return regval;
}
/****************************************************************************
* Name: sam_allocdesc
*
* Description:
* Allocate and add one descriptor to the DMA channel's link list.
*
* NOTE: link list entries are freed by the DMA interrupt handler.
* However, since the setting/clearing of the 'in use' indication is
* atomic, no special actions need be performed. It would be a good thing
* to add logic to handle the case where all of the entries are exhausted
* and we could wait for some to be freed by the interrupt handler.
*
****************************************************************************/
static struct chnext_view1_s *
sam_allocdesc(struct sam_xdmach_s *xdmach, struct chnext_view1_s *prev,
uint32_t csa, uint32_t cda, uint32_t cubc)
{
struct sam_xdmac_s *xdmac = sam_controller(xdmach);
struct chnext_view1_s *descr = NULL;
int i;
/* Sanity check -- csa == 0 is the indication that the link is unused.
* Obviously setting it to zero would break that usage.
*/
#ifdef CONFIG_DEBUG
if (csa != 0)
#endif
{
/* Table a descriptor table semaphore count. When we get one, then there
* is at least one free descriptor in the table and it is ours.
*/
sam_takedsem(xdmac);
/* Examine each link list entry to find an available one -- i.e., one
* with csa == 0. That csa field is set to zero by the DMA transfer
* complete interrupt handler. The following should be safe because
* that is an atomic operation.
*/
sam_takechsem(xdmac);
for (i = 0; i < CONFIG_SAMA5_NLLDESC; i++)
{
if (xdmac->descr[i].csa == 0)
{
/* We have it. Initialize the new link list entry */
descr = &xdmac->descr[i];
descr->cnda = 0; /* Next Descriptor Address */
descr->cubc = cubc; /* Channel Microblock Control Register */
descr->csa = csa; /* Source address */
descr->cda = cda; /* Destination address */
/* And then hook it at the tail of the link list */
if (!prev)
{
/* There is no previous link. This is the new head of
* the list
*/
DEBUGASSERT(xdmach->llhead == NULL && xdmach->lltail == NULL);
xdmach->llhead = descr;
}
else
{
DEBUGASSERT(xdmach->llhead != NULL && xdmach->lltail == prev);
/* When the second link is added to the list, that is the
* cue that we are going to do the link list transfer.
*
* Set the NDE field in the previous descriptor; Clear the
* NDE field in the final descriptor.
*/
prev->cubc |= CHNEXT_UBC_NDE;
/* Link the previous tail to the new tail.
* REVISIT: This assumes that the next description is fetched
* via AHB IF0.
*/
prev->cnda = (uint32_t)sam_physramaddr((uintptr_t)descr);
}
/* In any event, this is the new tail of the list */
xdmach->lltail = descr;
/* Assume that we will be doing multiple buffer transfers and that
* that hardware will be accessing the descriptor via DMA.
*/
arch_clean_dcache((uintptr_t)descr,
(uintptr_t)descr + sizeof(struct chnext_view1_s));
break;
}
}
/* Because we hold a count from the counting semaphore, the above
* search loop should always be successful.
*/
sam_givechsem(xdmac);
DEBUGASSERT(descr != NULL);
}
return descr;
}
/****************************************************************************
* Name: sam_freelinklist
*
* Description:
* Free all descriptors in the DMA channel's link list.
*
* NOTE: Called from the DMA interrupt handler.
*
****************************************************************************/
static void sam_freelinklist(struct sam_xdmach_s *xdmach)
{
struct sam_xdmac_s *xdmac = sam_controller(xdmach);
struct chnext_view1_s *descr;
uintptr_t paddr;
/* Get the head of the link list and detach the link list from the DMA
* channel
*/
descr = xdmach->llhead;
xdmach->llhead = NULL;
xdmach->lltail = NULL;
while (descr != NULL)
{
/* Valid, in-use descriptors never have csa == 0 */
DEBUGASSERT(descr->csa != 0);
/* Get the physical address of the next descriptor in the list */
paddr = descr->cnda;
/* Free the descriptor by simply nullifying it and bumping up the
* semaphore count.
*/
memset(descr, 0, sizeof(struct chnext_view1_s));
sam_givedsem(xdmac);
/* Get the virtual address of the next descriptor in the list */
descr = (struct chnext_view1_s *)sam_virtramaddr(paddr);
}
}
/****************************************************************************
* Name: sam_txbuffer
*
* Description:
* Configure DMA for transmit of one buffer (memory to peripheral). This
* function may be called multiple times to handle large and/or dis-
* continuous transfers.
*
****************************************************************************/
static int sam_txbuffer(struct sam_xdmach_s *xdmach, uint32_t paddr,
uint32_t maddr, size_t nbytes)
{
uint32_t cubc;
/* If we are appending a buffer to a linklist, then re-use the previously
* calculated CC register value. Otherwise, create the CC register value
* from the properties of the transfer.
*/
if (!xdmach->llhead)
{
xdmach->cc = sam_txcc(xdmach);
}
/* Calculate the number of transfers for CUBC */
cubc = sam_cubc(xdmach, nbytes);
cubc |= (CHNEXT_UBC_NVIEW_1 | CHNEXT_UBC_NSEN);
/* Add the new link list entry */
if (!sam_allocdesc(xdmach, xdmach->lltail, maddr, paddr, cubc))
{
return -ENOMEM;
}
return OK;
}
/****************************************************************************
* Name: sam_rxbuffer
*
* Description:
* Configure DMA for receipt of one buffer (peripheral to memory). This
* function may be called multiple times to handle large and/or dis-
* continuous transfers.
*
****************************************************************************/
static int sam_rxbuffer(struct sam_xdmach_s *xdmach, uint32_t paddr,
uint32_t maddr, size_t nbytes)
{
uint32_t cubc;
/* If we are appending a buffer to a linklist, then re-use the previously
* calculated CC register value. Otherwise, create the CC register value
* from the properties of the transfer.
*/
if (!xdmach->llhead)
{
xdmach->cc = sam_rxcc(xdmach);
}
/* Calculate the number of transfers for CUBC */
cubc = sam_cubc(xdmach, nbytes);
cubc |= (CHNEXT_UBC_NVIEW_1 | CHNEXT_UBC_NSEN);
/* Add the new link list entry */
if (!sam_allocdesc(xdmach, xdmach->lltail, paddr, maddr, cubc))
{
return -ENOMEM;
}
return OK;
}
/****************************************************************************
* Name: sam_single
*
* Description:
* Start a single buffer DMA.
*
****************************************************************************/
static inline int sam_single(struct sam_xdmach_s *xdmach)
{
struct sam_xdmac_s *xdmac = sam_controller(xdmach);
struct chnext_view1_s *llhead = xdmach->llhead;
/* 1. Read the XDMAC Global Channel Status Register (XDMAC_GS) to choose a
* free channel.
*
* In this implementation, the free channel is assigned in a different
* manner.
*/
/* 2. Clear any pending interrupts from any previous XDMAC transfer by
* reading the XDMAC Channel Interrupt Status Register (CIS).
*/
(void)sam_getdmach(xdmach, SAM_XDMACH_CIS_OFFSET);
/* 3. Write the starting source address in the Channel Source Address (CSA)
* Register.
*/
DEBUGASSERT(llhead != NULL && llhead->csa != 0);
sam_putdmach(xdmach, llhead->csa, SAM_XDMACH_CSA_OFFSET);
/* 4. Write the starting destination address in the Channel Destination
* Address Register (CDA).
*/
sam_putdmach(xdmach, llhead->cda, SAM_XDMACH_CDA_OFFSET);
/* 5. Program field UBLEN in the XDMAC Channel Microblock Control (CUBC)
* Register with the number of data.
*/
sam_putdmach(xdmach, llhead->cubc, SAM_XDMACH_CUBC_OFFSET);
/* 6. Program the Channel Control (CC) Register */
sam_putdmach(xdmach, xdmach->cc, SAM_XDMACH_CC_OFFSET);
/* 7. Clear the following five registers:
*
* XDMAC Channel Next Descriptor Control (CNDC) Register
* XDMAC Channel Block Control (CBC) Register
* XDMAC Channel Data Stride Memory Set Pattern (CDSMSP) Register
* XDMAC Channel Source Microblock Stride (CSUS) Register
* XDMAC Channel Destination Microblock Stride (CDUS)Register
*
* This respectively indicates that the linked list is disabled, there is
* only one block and striding is disabled
*/
sam_putdmach(xdmach, 0, SAM_XDMACH_CNDC_OFFSET);
sam_putdmach(xdmach, 0, SAM_XDMACH_CBC_OFFSET);
sam_putdmach(xdmach, 0, SAM_XDMACH_CDSMSP_OFFSET);
sam_putdmach(xdmach, 0, SAM_XDMACH_CSUS_OFFSET);
sam_putdmach(xdmach, 0, SAM_XDMACH_CDUS_OFFSET);
/* 8. Enable the Microblock interrupt by setting the "End of Block"
* interrupt bit in the XDMAC Channel Interrupt Enable (CIE) Register.
*/
sam_putdmach(xdmach, XDMAC_CHINT_BI | XDMAC_CHINT_ERRORS,
SAM_XDMACH_CIE_OFFSET);
/* Enable the Channel Interrupt Enable bit by setting the corresponding
* bit in the XDMAC Global Interrupt Enable (GIE) Register.
*/
sam_putdmac(xdmac, XDMAC_CHAN(xdmach->chan), SAM_XDMAC_GIE_OFFSET);
/* 9. Enable the channel by setting the corresponding bit in the
* XDMAC Global Channel Enable (GE) Register. The channel bit will
* be set in the GS register by hardware.
*/
sam_putdmac(xdmac, XDMAC_CHAN(xdmach->chan), SAM_XDMAC_GE_OFFSET);
/* 10. The DMA has been started. Once completed, the DMA channel sets the
* corresponding "End of Block Interrupt" Status bit in the channel
* CIS register and generates an global interrupt for the channel.
* The channel bit will be cleared in the GS register by hardware.
*/
return OK;
}
/****************************************************************************
* Name: sam_multiple
*
* Description:
* Start a multiple buffer DMA.
*
****************************************************************************/
static inline int sam_multiple(struct sam_xdmach_s *xdmach)
{
struct sam_xdmac_s *xdmac = sam_controller(xdmach);
#ifdef CONFIG_DEBUG
struct chnext_view1_s *llhead = xdmach->llhead;
#endif
uintptr_t paddr;
uint32_t regval;
DEBUGASSERT(llhead != NULL && llhead->csa != 0);
/* 1. Read the XDMAC Global Channel Status Register (XDMAC_GS) to choose a
* free channel.
*
* In this implementation, the free channel is assigned in a different
* manner.
*/
/* 2. Clear any pending interrupts from any previous XDMAC transfer by
* reading the XDMAC Channel Interrupt Status Register (CIS).
*/
(void)sam_getdmach(xdmach, SAM_XDMACH_CIS_OFFSET);
/* 3. Build a linked list of transfer descriptors in memory. The
* descriptor view is programmable on a per descriptor basis. The
* linked list items structure must be word aligned. CUBC NDE
* must be configured to 0 in the last descriptor to terminate the
* list.
*
* This was done during the RX/TX setup phases of the DMA transfer.
*/
/* Since we are using view1, I imagine that we need to set the Channel
* Control (CC) Register.
*/
sam_putdmach(xdmach, xdmach->cc, SAM_XDMACH_CC_OFFSET);
/* 4. Program field NDA in the XDMAC Channel Next Descriptor Address
* (CNDA) Register with the first descriptor address and bit NDAIF
* with the master interface identifier.
*
* REVIST: Using NDAIF=0. Is that correct?
*/
paddr = sam_physramaddr((uintptr_t)xdmach->llhead);
sam_putdmach(xdmach, (uint32_t)paddr, SAM_XDMACH_CNDA_OFFSET);
/* 5. Program the CNDC register:
*
* a. Set NDE to enable the descriptor fetch.
* b. Set NDSUP to update the source address at the descriptor fetch
* time, otherwise clear this bit.
* c. Set NDDUP to update the destination address at the descriptor
* fetch time, otherwise clear this bit.
* d. Program the NDVIEW field to define the length of the first
* descriptor.
*/
regval = (XDMACH_CNDC_NDE | XDMACH_CNDC_NDVIEW_NDV2);
/* Update the source address if this is a memory-to-* transfer.
*
* TYPE = 0 -> memory-to-memory
* TYPE = 1 && DSYNC = 1 -> memory-to-peripheral
*/
if ((xdmach->cc & XDMACH_CC_TYPE) == 0 ||
(xdmach->cc & XDMACH_CC_DSYNC) != 0)
{
regval |= XDMACH_CNDC_NDSUP;
}
/* Update the destination address if this is a *-to-memory transfer.
*
* TYPE = 0 -> memory-to-memory
* TYPE = 1 && DSYNC = 0 -> peripheral-to-memory
*/
if ((xdmach->cc & XDMACH_CC_TYPE) == 0 ||
(xdmach->cc & XDMACH_CC_TYPE) == 0)
{
regval |= XDMACH_CNDC_NDDUP;
}
sam_putdmach(xdmach, regval, SAM_XDMACH_CNDC_OFFSET);
/* 6. Enable the End of Linked List interrupt by setting the LI bit in the
* CIE register.
*/
sam_putdmach(xdmach, XDMAC_CHINT_LI | XDMAC_CHINT_ERRORS,
SAM_XDMACH_CIE_OFFSET);
/* Enable the Channel Interrupt Enable bit by setting the corresponding
* bit in the XDMAC Global Interrupt Enable (GIE) Register.
*/
sam_putdmac(xdmac, XDMAC_CHAN(xdmach->chan), SAM_XDMAC_GIE_OFFSET);
/* 7. Enable the channel by setting the corresponding bit in the
* XDMAC Global Channel Enable (GE) Register. The channel bit will
* be set in the GS register by hardware.
*/
sam_putdmac(xdmac, XDMAC_CHAN(xdmach->chan), SAM_XDMAC_GE_OFFSET);
/* 8. The DMA has been started. Once completed, the DMA channel sets the
* corresponding "End of Block Interrupt" Status bit in the channel
* CIS register and generates an global interrupt for the channel.
* The channel bit will be cleared in the GS register by hardware.
*/
return OK;
}
/****************************************************************************
* Name: sam_dmaterminate
*
* Description:
* Terminate the DMA transfer and disable the DMA channel
*
****************************************************************************/
static void sam_dmaterminate(struct sam_xdmach_s *xdmach, int result)
{
struct sam_xdmac_s *xdmac = sam_controller(xdmach);
uint32_t chanbit = XDMAC_CHAN(xdmach->chan);
/* Disable all channel interrupts */
sam_putdmac(xdmac, chanbit, SAM_XDMAC_GID_OFFSET);
sam_putdmach(xdmach, XDMAC_CHINT_ALL, SAM_XDMACH_CID_OFFSET);
/* Under normal operation, the software enables a channel by setting the
* associated bit in the Global Channel Enable (GE) Register. The hardware
* then disables a channel on transfer completion by clearing channel bit
* in the GS register. To disable a channel, setting the channel bit in the
* GD register and poll the channel bit in GS register to determine when
* the channel has been disabled.
*/
sam_putdmac(xdmac, chanbit, SAM_XDMAC_GD_OFFSET);
while ((sam_getdmac(xdmac, SAM_XDMAC_GS_OFFSET) & chanbit) != 0);
/* Free the linklist */
sam_freelinklist(xdmach);
/* If this was an RX DMA (peripheral-to-memory), then invalidate the cache
* to force reloads from memory.
*/
if (xdmach->rx)
{
arch_invalidate_dcache(xdmach->rxaddr, xdmach->rxaddr + xdmach->rxsize);
}
/* Perform the DMA complete callback */
if (xdmach->callback)
{
xdmach->callback((DMA_HANDLE)xdmach, xdmach->arg, result);
}
xdmach->callback = NULL;
xdmach->arg = NULL;
}
/****************************************************************************
* Name: sam_xdmac_interrupt
*
* Description:
* DMA interrupt handler
*
****************************************************************************/
static int sam_xdmac_interrupt(struct sam_xdmac_s *xdmac)
{
struct sam_xdmach_s *xdmach;
unsigned int chndx;
uint32_t gpending;
uint32_t chpending;
uint32_t bit;
/* Get the set of pending, unmasked global XDMAC interrupts */
gpending = sam_getdmac(xdmac, SAM_XDMAC_GIS_OFFSET) &
sam_getdmac(xdmac, SAM_XDMAC_GIM_OFFSET);
/* Yes.. Check each bit to see which channel(s) have interrupted */
for (chndx = 0; chndx < SAM_NDMACHAN && gpending != 0; chndx++)
{
/* Are any interrupts pending for this channel? */
bit = XDMAC_CHAN(chndx);
if ((gpending & bit) != 0)
{
xdmach = &xdmac->xdmach[chndx];
/* Get the set of interrupts pending for this channel */
chpending = sam_getdmach(xdmach, SAM_XDMACH_CIS_OFFSET) &
sam_getdmach(xdmach, SAM_XDMACH_CIM_OFFSET);
/* Yes.. Did an error occur? */
if ((chpending & XDMAC_CHINT_ERRORS) != 0)
{
/* Yes... Terminate the transfer with an error? */
dmalldbg("ERROR: DMA failed: %08x\n", chpending);
sam_dmaterminate(xdmach, -EIO);
}
/* Is the transfer complete? */
else if ((chpending & (XDMAC_CHINT_BI | XDMAC_CHINT_LI)) != 0)
{
/* Yes.. Terminate the transfer with success */
sam_dmaterminate(xdmach, OK);
}
/* Else what? */
else
{
dmalldbg("ERROR: Unexpected interrupt: %08x\n", chpending);
DEBUGPANIC();
}
/* Clear the bit in the sampled set of pending global interrupts */
gpending &= !bit;
}
}
return OK;
}
/****************************************************************************
* Name: sam_xdmac0_interrupt and sam_xdmac1_interrupt
*
* Description:
* DMA interrupt handler
*
****************************************************************************/
#ifdef CONFIG_SAMA5_XDMAC0
static int sam_xdmac0_interrupt(int irq, void *context)
{
return sam_xdmac_interrupt(&g_xdmac0);
}
#endif
#ifdef CONFIG_SAMA5_XDMAC1
static int sam_xdmac1_interrupt(int irq, void *context)
{
return sam_xdmac_interrupt(&g_xdmac1);
}
#endif
/****************************************************************************
* Name: sam_dmainitialize
*
* Description:
* Initialize the DMA subsystem
*
* Returned Value:
* None
*
****************************************************************************/
void sam_dmainitialize(struct sam_xdmac_s *xdmac)
{
/* Disable all DMA interrupts */
sam_putdmac(xdmac, XDMAC_CHAN_ALL, SAM_XDMAC_GID_OFFSET);
/* Disable all DMA channels */
sam_putdmac(xdmac, XDMAC_CHAN_ALL, SAM_XDMAC_GD_OFFSET);
/* Initialize semaphores */
sem_init(&xdmac->chsem, 0, 1);
sem_init(&xdmac->dsem, 0, SAM_NDMACHAN);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_dmainitialize
*
* Description:
* Initialize the DMA subsystem
*
* Returned Value:
* None
*
****************************************************************************/
void weak_function up_dmainitialize(void)
{
#ifdef CONFIG_SAMA5_XDMAC0
dmallvdbg("Initialize XDMAC0\n");
/* Enable peripheral clock */
sam_xdmac0_enableclk();
/* Attach DMA interrupt vector */
(void)irq_attach(SAM_IRQ_XDMAC0, sam_xdmac0_interrupt);
/* Initialize the controller */
sam_dmainitialize(&g_xdmac0);
/* Enable the IRQ at the AIC (still disabled at the DMA controller) */
up_enable_irq(SAM_IRQ_XDMAC0);
#endif
#ifdef CONFIG_SAMA5_XDMAC1
dmallvdbg("Initialize XDMAC1\n");
/* Enable peripheral clock */
sam_xdmac1_enableclk();
/* Attach DMA interrupt vector */
(void)irq_attach(SAM_IRQ_XDMAC1, sam_xdmac1_interrupt);
/* Initialize the controller */
sam_dmainitialize(&g_xdmac1);
/* Enable the IRQ at the AIC (still disabled at the DMA controller) */
up_enable_irq(SAM_IRQ_XDMAC1);
#endif
}
/****************************************************************************
* Name: sam_dmachannel
*
* Allocate a DMA channel. This function sets aside a DMA channel then
* gives the caller exclusive access to the DMA channel.
*
* The naming convention in all of the DMA interfaces is that one side is
* the 'peripheral' and the other is 'memory'. Howerver, the interface
* could still be used if, for example, both sides were memory although
* the naming would be awkward.
*
* Returned Value:
* If a DMA channel is available, this function returns a non-NULL, void*
* DMA channel handle. NULL is returned on any failure.
*
****************************************************************************/
DMA_HANDLE sam_dmachannel(uint8_t dmacno, uint32_t chflags)
{
struct sam_xdmac_s *xdmac;
struct sam_xdmach_s *xdmach;
unsigned int chndx;
/* Pick the DMA controller */
#ifdef CONFIG_SAMA5_XDMAC0
if (dmacno == 0)
{
xdmac = &g_xdmac0;
}
else
#endif
#ifdef CONFIG_SAMA5_XDMAC1
if (dmacno == 1)
{
xdmac = &g_xdmac1;
}
else
#endif
{
dmadbg("ERROR: Bad XDMAC number: %d\n", dmacno);
DEBUGPANIC();
return (DMA_HANDLE)NULL;
}
/* Search for an available DMA channel with at least the requested FIFO
* size.
*/
xdmach = NULL;
sam_takechsem(xdmac);
for (chndx = 0; chndx < SAM_NDMACHAN; chndx++)
{
struct sam_xdmach_s *candidate = &xdmac->xdmach[chndx];
if (!candidate->inuse)
{
xdmach = candidate;
xdmach->inuse = true;
/* Clear the pending Interrupt Status bits by reading the XDMAC
* Channel Interrupt Status (CIS) Register
*/
(void)sam_getdmach(xdmach, SAM_XDMACH_CIS_OFFSET);
/* Disable the channel by writing one to the write-only Global
* Channel Disable (GD) Register
*/
sam_putdmac(xdmac, XDMAC_CHAN(chndx), SAM_XDMAC_GD_OFFSET);
/* Set the DMA channel flags. */
xdmach->flags = chflags;
break;
}
}
sam_givechsem(xdmac);
/* Show the result of the allocation */
if (xdmach)
{
dmavdbg("XDMAC%d CH%d: chflags: %08x returning xdmach: %p\n",
(int)dmacno, xdmach->chan, (int)chflags, xdmach);
}
else
{
dmadbg("ERROR: Failed allocate XDMAC%d channel\n", (int)dmacno);
}
return (DMA_HANDLE)xdmach;
}
/************************************************************************************
* Name: sam_dmaconfig
*
* Description:
* There are two channel usage models: (1) The channel is allocated and configured
* in one step. This is the typical case where a DMA channel performs a constant
* role. The alternative is (2) where the DMA channel is reconfigured on the fly.
* In this case, the chflags provided to sam_dmachannel are not used and
* sam_dmaconfig() is called before each DMA to configure the DMA channel
* appropriately.
*
* Returned Value:
* None
*
************************************************************************************/
void sam_dmaconfig(DMA_HANDLE handle, uint32_t chflags)
{
struct sam_xdmach_s *xdmach = (struct sam_xdmach_s *)handle;
/* Set the new DMA channel flags. */
xdmach->flags = chflags;
#if defined(CONFIG_SAMA5_XDMAC0) && defined(CONFIG_SAMA5_XDMAC1)
dmavdbg("XDMAC%d CH%d: chflags: %08x\n",
xdmach->xdmac, xdmach->chan, (int)chflags);
#elif defined(CONFIG_SAMA5_XDMAC0)
dmavdbg("XDMAC0 CH%d: chflags: %08x\n",
xdmach->chan, (int)chflags);
#else
dmavdbg("XDMAC1 CH%d: chflags: %08x\n",
xdmach->chan, (int)chflags);
#endif
}
/****************************************************************************
* Name: sam_dmafree
*
* Description:
* Release a DMA channel. NOTE: The 'handle' used in this argument must
* NEVER be used again until sam_dmachannel() is called again to re-gain
* a valid handle.
*
* Returned Value:
* None
*
****************************************************************************/
void sam_dmafree(DMA_HANDLE handle)
{
struct sam_xdmach_s *xdmach = (struct sam_xdmach_s *)handle;
struct sam_xdmac_s *xdmac;
dmavdbg("xdmach: %p\n", xdmach);
DEBUGASSERT((xdmach != NULL) && (xdmach->inuse));
xdmac = sam_controller(xdmach);
/* Make sure that the channel is disabled by writing one to the write-only
* Global Channel Disable (GD) Register
*/
sam_putdmac(xdmac, XDMAC_CHAN(xdmach->chan), SAM_XDMAC_GD_OFFSET);
/* Mark the channel no longer in use. Clearing the inuse flag is an atomic
* operation and so should be safe.
*/
xdmach->flags = 0;
xdmach->inuse = false; /* No longer in use */
}
/****************************************************************************
* Name: sam_dmatxsetup
*
* Description:
* Configure DMA for transmit of one buffer (memory to peripheral). This
* function may be called multiple times to handle large and/or dis-
* continuous transfers. Calls to sam_dmatxsetup() and sam_dmarxsetup()
* must not be intermixed on the same transfer, however.
*
****************************************************************************/
int sam_dmatxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr,
size_t nbytes)
{
struct sam_xdmach_s *xdmach = (struct sam_xdmach_s *)handle;
size_t maxtransfer;
size_t remaining;
int ret = OK;
dmavdbg("xdmach: %p paddr: %08x maddr: %08x nbytes: %d\n",
xdmach, (int)paddr, (int)maddr, (int)nbytes);
DEBUGASSERT(xdmach);
dmavdbg("llhead: %p lltail: %p\n", xdmach->llhead, xdmach->lltail);
/* The maximum transfer size in bytes depends upon the maximum number of
* transfers and the number of bytes per transfer.
*/
maxtransfer = sam_maxtransfer(xdmach);
remaining = nbytes;
/* If this is a large transfer, break it up into smaller buffers */
while (remaining > maxtransfer)
{
/* Set up the maximum size transfer */
ret = sam_txbuffer(xdmach, paddr, maddr, maxtransfer);
if (ret == OK)
{
/* Decrement the number of bytes left to transfer */
remaining -= maxtransfer;
/* Increment the memory & peripheral address (if it is appropriate to
* do so).
*/
if ((xdmach->flags & DMACH_FLAG_PERIPHINCREMENT) != 0)
{
paddr += maxtransfer;
}
if ((xdmach->flags & DMACH_FLAG_MEMINCREMENT) != 0)
{
maddr += maxtransfer;
}
}
}
/* Then set up the final buffer transfer */
if (ret == OK && remaining > 0)
{
ret = sam_txbuffer(xdmach, paddr, maddr, remaining);
}
/* Save an indication so that the DMA interrupt completion logic will know
* that this was not an RX transfer.
*/
xdmach->rx = false;
/* Clean caches associated with the DMA memory */
arch_clean_dcache(maddr, maddr + nbytes);
return ret;
}
/****************************************************************************
* Name: sam_dmarxsetup
*
* Description:
* Configure DMA for receipt of one buffer (peripheral to memory). This
* function may be called multiple times to handle large and/or dis-
* continuous transfers. Calls to sam_dmatxsetup() and sam_dmarxsetup()
* must not be intermixed on the same transfer, however.
*
****************************************************************************/
int sam_dmarxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr,
size_t nbytes)
{
struct sam_xdmach_s *xdmach = (struct sam_xdmach_s *)handle;
size_t maxtransfer;
size_t remaining;
int ret = OK;
dmavdbg("xdmach: %p paddr: %08x maddr: %08x nbytes: %d\n",
xdmach, (int)paddr, (int)maddr, (int)nbytes);
DEBUGASSERT(xdmach);
dmavdbg("llhead: %p lltail: %p\n", xdmach->llhead, xdmach->lltail);
/* The maximum transfer size in bytes depends upon the maximum number of
* transfers and the number of bytes per transfer.
*/
maxtransfer = sam_maxtransfer(xdmach);
remaining = nbytes;
/* If this is a large transfer, break it up into smaller buffers */
while (remaining > maxtransfer)
{
/* Set up the maximum size transfer */
ret = sam_rxbuffer(xdmach, paddr, maddr, maxtransfer);
if (ret == OK)
{
/* Decrement the number of bytes left to transfer */
remaining -= maxtransfer;
/* Increment the memory & peripheral address (if it is appropriate to
* do so).
*/
if ((xdmach->flags & DMACH_FLAG_PERIPHINCREMENT) != 0)
{
paddr += maxtransfer;
}
if ((xdmach->flags & DMACH_FLAG_MEMINCREMENT) != 0)
{
maddr += maxtransfer;
}
}
}
/* Then set up the final buffer transfer */
if (ret == OK && remaining > 0)
{
ret = sam_rxbuffer(xdmach, paddr, maddr, remaining);
}
/* Save an indication so that the DMA interrupt completion logic will know
* that this was an RX transfer and will invalidate the cache.
*/
xdmach->rx = true;
xdmach->rxaddr = maddr;
xdmach->rxsize = (xdmach->flags & DMACH_FLAG_MEMINCREMENT) != 0 ? nbytes : sizeof(uint32_t);
/* Clean caches associated with the DMA memory */
arch_clean_dcache(maddr, maddr + nbytes);
return ret;
}
/****************************************************************************
* Name: sam_dmastart
*
* Description:
* Start the DMA transfer
*
****************************************************************************/
int sam_dmastart(DMA_HANDLE handle, dma_callback_t callback, void *arg)
{
struct sam_xdmach_s *xdmach = (struct sam_xdmach_s *)handle;
int ret = -EINVAL;
dmavdbg("xdmach: %p callback: %p arg: %p\n", xdmach, callback, arg);
DEBUGASSERT(xdmach != NULL);
/* Verify that the DMA has been setup (i.e., at least one entry in the
* link list).
*/
if (xdmach->llhead)
{
/* Save the callback info. This will be invoked whent the DMA commpletes */
xdmach->callback = callback;
xdmach->arg = arg;
/* Is this a single block transfer? Or a multiple block transfer? */
if (xdmach->llhead == xdmach->lltail)
{
ret = sam_single(xdmach);
}
else
{
ret = sam_multiple(xdmach);
}
}
return ret;
}
/****************************************************************************
* Name: sam_dmastop
*
* Description:
* Cancel the DMA. After sam_dmastop() is called, the DMA channel is
* reset and sam_dmarx/txsetup() must be called before sam_dmastart() can be
* called again
*
****************************************************************************/
void sam_dmastop(DMA_HANDLE handle)
{
struct sam_xdmach_s *xdmach = (struct sam_xdmach_s *)handle;
irqstate_t flags;
dmavdbg("xdmach: %p\n", xdmach);
DEBUGASSERT(xdmach != NULL);
flags = enter_critical_section();
sam_dmaterminate(xdmach, -EINTR);
leave_critical_section(flags);
}
/****************************************************************************
* Name: sam_dmasample
*
* Description:
* Sample DMA register contents
*
* Assumptions:
* - DMA handle allocated by sam_dmachannel()
*
****************************************************************************/
#ifdef CONFIG_DEBUG_DMA
void sam_dmasample(DMA_HANDLE handle, struct sam_dmaregs_s *regs)
{
struct sam_xdmach_s *xdmach = (struct sam_xdmach_s *)handle;
struct sam_xdmac_s *xdmac = sam_controller(xdmach);
irqstate_t flags;
/* Sample global registers. NOTE: reading GIS clears interrupts, but
* that should be okay IF interrupts are enabled when this function is
* called. But there is a race condition where this instrumentation could
* cause lost interrupts.
*/
flags = enter_critical_section();
regs->gtype = sam_getdmac(xdmac, SAM_XDMAC_GTYPE_OFFSET);
regs->gcfg = sam_getdmac(xdmac, SAM_XDMAC_GCFG_OFFSET);
regs->gwac = sam_getdmac(xdmac, SAM_XDMAC_GWAC_OFFSET);
regs->gim = sam_getdmac(xdmac, SAM_XDMAC_GIM_OFFSET);
regs->gis = sam_getdmac(xdmac, SAM_XDMAC_GIS_OFFSET);
regs->gs = sam_getdmac(xdmac, SAM_XDMAC_GS_OFFSET);
regs->grs = sam_getdmac(xdmac, SAM_XDMAC_GRS_OFFSET);
regs->gws = sam_getdmac(xdmac, SAM_XDMAC_GWS_OFFSET);
regs->gsws = sam_getdmac(xdmac, SAM_XDMAC_GSWS_OFFSET);
/* Sample channel registers */
regs->cim = sam_getdmach(xdmach, SAM_XDMACH_CIM_OFFSET);
regs->cis = sam_getdmach(xdmach, SAM_XDMACH_CIS_OFFSET);
regs->csa = sam_getdmach(xdmach, SAM_XDMACH_CSA_OFFSET);
regs->cda = sam_getdmach(xdmach, SAM_XDMACH_CDA_OFFSET);
regs->cnda = sam_getdmach(xdmach, SAM_XDMACH_CNDA_OFFSET);
regs->cndc = sam_getdmach(xdmach, SAM_XDMACH_CNDC_OFFSET);
regs->cubc = sam_getdmach(xdmach, SAM_XDMACH_CUBC_OFFSET);
regs->cbc = sam_getdmach(xdmach, SAM_XDMACH_CBC_OFFSET);
regs->cc = sam_getdmach(xdmach, SAM_XDMACH_CC_OFFSET);
regs->cdsmsp = sam_getdmach(xdmach, SAM_XDMACH_CDSMSP_OFFSET);
regs->csus = sam_getdmach(xdmach, SAM_XDMACH_CSUS_OFFSET);
regs->cdus = sam_getdmach(xdmach, SAM_XDMACH_CDUS_OFFSET);
leave_critical_section(flags);
}
#endif /* CONFIG_DEBUG_DMA */
/****************************************************************************
* Name: sam_dmadump
*
* Description:
* Dump previously sampled DMA register contents
*
* Assumptions:
* - DMA handle allocated by sam_dmachannel()
*
****************************************************************************/
#ifdef CONFIG_DEBUG_DMA
void sam_dmadump(DMA_HANDLE handle, const struct sam_dmaregs_s *regs,
const char *msg)
{
struct sam_xdmach_s *xdmach = (struct sam_xdmach_s *)handle;
struct sam_xdmac_s *xdmac = sam_controller(xdmach);
dmadbg("%s\n", msg);
dmadbg(" DMA Global Registers:\n");
dmadbg(" GTYPE[%08x]: %08x\n", xdmac->base + SAM_XDMAC_GTYPE_OFFSET, regs->gtype);
dmadbg(" GCFG[%08x]: %08x\n", xdmac->base + SAM_XDMAC_GCFG_OFFSET, regs->gcfg);
dmadbg(" GWAC[%08x]: %08x\n", xdmac->base + SAM_XDMAC_GWAC_OFFSET, regs->gwac);
dmadbg(" GIM[%08x]: %08x\n", xdmac->base + SAM_XDMAC_GIM_OFFSET, regs->gim);
dmadbg(" GIS[%08x]: %08x\n", xdmac->base + SAM_XDMAC_GIS_OFFSET, regs->gis);
dmadbg(" GS[%08x]: %08x\n", xdmac->base + SAM_XDMAC_GS_OFFSET, regs->gs);
dmadbg(" GRS[%08x]: %08x\n", xdmac->base + SAM_XDMAC_GRS_OFFSET, regs->grs);
dmadbg(" GWS[%08x]: %08x\n", xdmac->base + SAM_XDMAC_GWS_OFFSET, regs->gws);
dmadbg(" GSWS[%08x]: %08x\n", xdmac->base + SAM_XDMAC_GSWS_OFFSET, regs->gsws);
dmadbg(" DMA Channel Registers:\n");
dmadbg(" CIM[%08x]: %08x\n", xdmach->base + SAM_XDMACH_CIM_OFFSET, regs->cim);
dmadbg(" CIS[%08x]: %08x\n", xdmach->base + SAM_XDMACH_CIS_OFFSET, regs->cis);
dmadbg(" CSA[%08x]: %08x\n", xdmach->base + SAM_XDMACH_CSA_OFFSET, regs->csa);
dmadbg(" CDA[%08x]: %08x\n", xdmach->base + SAM_XDMACH_CDA_OFFSET, regs->cda);
dmadbg(" CNDA[%08x]: %08x\n", xdmach->base + SAM_XDMACH_CNDA_OFFSET, regs->cnda);
dmadbg(" CNDC[%08x]: %08x\n", xdmach->base + SAM_XDMACH_CNDC_OFFSET, regs->cndc);
dmadbg(" CUBC[%08x]: %08x\n", xdmach->base + SAM_XDMACH_CUBC_OFFSET, regs->cubc);
dmadbg(" CBC[%08x]: %08x\n", xdmach->base + SAM_XDMACH_CBC_OFFSET, regs->cbc);
dmadbg(" CC[%08x]: %08x\n", xdmach->base + SAM_XDMACH_CC_OFFSET, regs->cc);
dmadbg(" CDSMSP[%08x]: %08x\n", xdmach->base + SAM_XDMACH_CDSMSP_OFFSET, regs->cdsmsp);
dmadbg(" CSUS[%08x]: %08x\n", xdmach->base + SAM_XDMACH_CSUS_OFFSET, regs->csus);
dmadbg(" CDUS[%08x]: %08x\n", xdmach->base + SAM_XDMACH_CDUS_OFFSET, regs->cdus);
}
#endif /* CONFIG_DEBUG_DMA */
#endif /* CONFIG_SAMA5_XDMAC0 || CONFIG_SAMA5_XDMAC1 */
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