diff options
| -rw-r--r-- | nuttx/arch/arm/src/sama5/sam_emac.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/sama5/sam_emac.c b/nuttx/arch/arm/src/sama5/sam_emac.c index b2a99e83b..a857180b6 100644 --- a/nuttx/arch/arm/src/sama5/sam_emac.c +++ b/nuttx/arch/arm/src/sama5/sam_emac.c @@ -223,6 +223,10 @@ struct sam_emac_s /* Used to track transmit and receive descriptors */ + uint8_t *rxbuffer; /* Allocated RX buffers */ + uint8_t *txbuffer; /* Allocated TX buffers */ + struct emac_rxdesc_s *rxdesc; /* Allocated RX descriptors */ + struct emac_txdesc_s *txdesc; /* Allocated TX descriptors */ struct emac_txdesc_s *txhead; /* Next available TX descriptor */ struct emac_rxdesc_s *rxhead; /* Next available RX descriptor */ @@ -256,8 +260,37 @@ struct sam_emac_s * Private Data ****************************************************************************/ +/* The driver state singleton */ + static struct sam_emac_s g_emac; +#ifdef CONFIG_SAMA5_EMAC_PREALLOCATE +/* Preallocated data */ +/* TX descriptors list */ + +static struct emac_txdesc_s g_txdesc[TX_BUFFERS] __attribute__((aligned(8))); + +/* RX descriptors list */ + +static struct emac_rxdesc_s g_rxdesc[RX_BUFFERS]__attribute__((aligned(8))); + +/* Transmit Buffers + * + * Section 3.6 of AMBA 2.0 spec states that burst should not cross 1K Boundaries. + * Receive buffer manager writes are burst of 2 words => 3 lsb bits of the address + * shall be set to 0 + */ + +static uint8_t g_txbuffer[CONFIG_SAMA5_EMAC_NTXBUFFERS * EMAC_TX_UNITSIZE]; + __attribute__((aligned(8))) + +/* Receive Buffers */ + +static uint8_t g_rxbuffer[CONFIG_SAMA5_EMAC_NRXBUFFERS * EMAC_RX_UNITSIZE] + __attribute__((aligned(8))); + +#endif + /**************************************************************************** * Private Function Prototypes ****************************************************************************/ @@ -339,6 +372,7 @@ static int sam_macconfig(FAR struct sam_emac_s *priv); static void sam_macaddress(FAR struct sam_emac_s *priv); static int sam_macenable(FAR struct sam_emac_s *priv); static int sam_ethconfig(FAR struct sam_emac_s *priv); +static int sam_buffer_initialize(struct sam_emac_s *priv); /**************************************************************************** * Private Functions @@ -2592,6 +2626,82 @@ static int sam_ethconfig(FAR struct sam_emac_s *priv) } /**************************************************************************** + * Function: sam_buffer_initialize + * + * Description: + * Allocate alligned TX and RX descriptors and buffers. For the case of + * pre-allocated structures, the function degenerates to a few assignements. + * + * Input Parameters: + * priv - The EMAC driver state + * + * Returned Value: + * OK on success; Negated errno on failure. + * + * Assumptions: + * Called very early in the initialization sequence. + * + ****************************************************************************/ + +static int sam_buffer_initialize(struct sam_emac_s *priv) +{ +#ifdef CONFIG_SAMA5_EMAC_PREALLOCATE + /* Use pre-allocated buffers */ + + priv->txdesc = g_txdesc; + priv->rxdesc = g_rxdesc; + priv->txbuffer = g_txbuffer; + priv->rxbuffer = g_rxbuffer; + +#else + /* Allocate buffers */ + + priv->txdesc = (struct emac_txdesc_s *) + kmemalign(8, CONFIG_SAMA5_EMAC_NTXBUFFERS * sizeof(struct emac_txdesc_s)); + if (!priv->txdesc) + { + nlldbg("ERROR: Failed to allocate TX descriptors\n"); + return -ENOMEM; + } + + priv->rxdesc = (struct emac_rxdesc_s *) + kmemalign(8, CONFIG_SAMA5_EMAC_NRXBUFFERS * sizeof(struct emac_rxdesc_s)); + if (!priv->txdesc) + { + nlldbg("ERROR: Failed to allocate RX descriptors\n"); + kfree(priv->txdesc); + return -ENOMEM; + } + + priv->txbuffer = (uint8_t *) + kmemalign(8, CONFIG_SAMA5_GMAC_NTXBUFFERS * GMAC_TX_UNITSIZE); + if (!priv->txbuffer) + { + nlldbg("ERROR: Failed to allocate TX buffer\n"); + kfree(priv->txdesc); + kfree(priv->rxdesc); + return -ENOMEM; + } + + priv->rxbuffer = (uint8_t *)kmemalign(8, CONFIG_SAMA5_GMAC_NRXBUFFERS * GMAC_RX_UNITSIZE); + if (!priv->rxbuffer) + { + nlldbg("ERROR: Failed to allocate RX buffer\n"); + kfree(priv->txdesc); + kfree(priv->rxdesc); + kfree(priv->rxbuffer); + return -ENOMEM; + } +#endif + + DEBUGASSERT(((uintptr_t)priv->rxdesc & 7) = 0 && + ((uintptr_t)priv->rxbuffer & 7) = 0 && + ((uintptr_t)priv->txdesc & 7) = 0 && + ((uintptr_t)priv->rxbuffer & 7) = 0 && + return OK; +} + +/**************************************************************************** * Public Functions ****************************************************************************/ |