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mbed-os/libraries/net/eth/lwip-eth/arch/TARGET_NXP/lpc17_emac.c

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/**********************************************************************
* $Id$ lpc17_emac.c 2011-11-20
*//**
* @file lpc17_emac.c
* @brief LPC17 ethernet driver for LWIP
* @version 1.0
* @date 20. Nov. 2011
* @author NXP MCU SW Application Team
*
* Copyright(C) 2011, NXP Semiconductor
* All rights reserved.
*
***********************************************************************
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* products. This software is supplied "AS IS" without any warranties.
* NXP Semiconductors assumes no responsibility or liability for the
* use of the software, conveys no license or title under any patent,
* copyright, or mask work right to the product. NXP Semiconductors
* reserves the right to make changes in the software without
* notification. NXP Semiconductors also make no representation or
* warranty that such application will be suitable for the specified
* use without further testing or modification.
**********************************************************************/
#include "lwip/opt.h"
#include "lwip/sys.h"
#include "lwip/def.h"
#include "lwip/mem.h"
#include "lwip/pbuf.h"
#include "lwip/stats.h"
#include "lwip/snmp.h"
#include "netif/etharp.h"
#include "netif/ppp_oe.h"
#include "lpc17xx_emac.h"
#include "eth_arch.h"
#include "lpc_emac_config.h"
#include "lpc_phy.h"
#include "sys_arch.h"
#include "mbed_interface.h"
#include <string.h>
#ifndef LPC_EMAC_RMII
#error LPC_EMAC_RMII is not defined!
#endif
#if LPC_NUM_BUFF_TXDESCS < 2
#error LPC_NUM_BUFF_TXDESCS must be at least 2
#endif
#if LPC_NUM_BUFF_RXDESCS < 3
#error LPC_NUM_BUFF_RXDESCS must be at least 3
#endif
/** @defgroup lwip17xx_emac_DRIVER lpc17 EMAC driver for LWIP
* @ingroup lwip_emac
*
* @{
*/
#if NO_SYS == 0
/** \brief Driver transmit and receive thread priorities
*
* Thread priorities for receive thread and TX cleanup thread. Alter
* to prioritize receive or transmit bandwidth. In a heavily loaded
* system or with LEIP_DEBUG enabled, the priorities might be better
* the same. */
#define RX_PRIORITY (osPriorityNormal)
#define TX_PRIORITY (osPriorityNormal)
/** \brief Debug output formatter lock define
*
* When using FreeRTOS and with LWIP_DEBUG enabled, enabling this
* define will allow RX debug messages to not interleave with the
* TX messages (so they are actually readable). Not enabling this
* define when the system is under load will cause the output to
* be unreadable. There is a small tradeoff in performance for this
* so use it only for debug. */
//#define LOCK_RX_THREAD
/** \brief Receive group interrupts
*/
#define RXINTGROUP (EMAC_INT_RX_OVERRUN | EMAC_INT_RX_ERR | EMAC_INT_RX_DONE)
/** \brief Transmit group interrupts
*/
#define TXINTGROUP (EMAC_INT_TX_UNDERRUN | EMAC_INT_TX_ERR | EMAC_INT_TX_DONE)
/** \brief Signal used for ethernet ISR to signal packet_rx() thread.
*/
#define RX_SIGNAL 1
#else
#define RXINTGROUP 0
#define TXINTGROUP 0
#endif
/** \brief Structure of a TX/RX descriptor
*/
typedef struct
{
volatile u32_t packet; /**< Pointer to buffer */
volatile u32_t control; /**< Control word */
} LPC_TXRX_DESC_T;
/** \brief Structure of a RX status entry
*/
typedef struct
{
volatile u32_t statusinfo; /**< RX status word */
volatile u32_t statushashcrc; /**< RX hash CRC */
} LPC_TXRX_STATUS_T;
/* LPC EMAC driver data structure */
struct lpc_enetdata {
/* prxs must be 8 byte aligned! */
LPC_TXRX_STATUS_T prxs[LPC_NUM_BUFF_RXDESCS]; /**< Pointer to RX statuses */
struct netif *netif; /**< Reference back to LWIP parent netif */
LPC_TXRX_DESC_T ptxd[LPC_NUM_BUFF_TXDESCS]; /**< Pointer to TX descriptor list */
LPC_TXRX_STATUS_T ptxs[LPC_NUM_BUFF_TXDESCS]; /**< Pointer to TX statuses */
LPC_TXRX_DESC_T prxd[LPC_NUM_BUFF_RXDESCS]; /**< Pointer to RX descriptor list */
struct pbuf *rxb[LPC_NUM_BUFF_RXDESCS]; /**< RX pbuf pointer list, zero-copy mode */
u32_t rx_fill_desc_index; /**< RX descriptor next available index */
volatile u32_t rx_free_descs; /**< Count of free RX descriptors */
struct pbuf *txb[LPC_NUM_BUFF_TXDESCS]; /**< TX pbuf pointer list, zero-copy mode */
u32_t lpc_last_tx_idx; /**< TX last descriptor index, zero-copy mode */
#if NO_SYS == 0
sys_thread_t RxThread; /**< RX receive thread data object pointer */
sys_sem_t TxCleanSem; /**< TX cleanup thread wakeup semaphore */
sys_mutex_t TXLockMutex; /**< TX critical section mutex */
sys_sem_t xTXDCountSem; /**< TX free buffer counting semaphore */
#endif
};
#if defined(TARGET_LPC4088)
# if defined (__ICCARM__)
# define ETHMEM_SECTION
# elif defined(TOOLCHAIN_GCC_CR)
# define ETHMEM_SECTION __attribute__((section(".data.$RamPeriph32")))
# else
# define ETHMEM_SECTION __attribute__((section("AHBSRAM1"),aligned))
# endif
#elif defined(TARGET_LPC1768)
# if defined(TOOLCHAIN_GCC_ARM)
# define ETHMEM_SECTION __attribute__((section("AHBSRAM1"),aligned))
# endif
#endif
#ifndef ETHMEM_SECTION
#define ETHMEM_SECTION ALIGNED(8)
#endif
/** \brief LPC EMAC driver work data
*/
ETHMEM_SECTION struct lpc_enetdata lpc_enetdata;
/** \brief Queues a pbuf into the RX descriptor list
*
* \param[in] lpc_enetif Pointer to the drvier data structure
* \param[in] p Pointer to pbuf to queue
*/
static void lpc_rxqueue_pbuf(struct lpc_enetdata *lpc_enetif, struct pbuf *p)
{
u32_t idx;
/* Get next free descriptor index */
idx = lpc_enetif->rx_fill_desc_index;
/* Setup descriptor and clear statuses */
lpc_enetif->prxd[idx].control = EMAC_RCTRL_INT | ((u32_t) (p->len - 1));
lpc_enetif->prxd[idx].packet = (u32_t) p->payload;
lpc_enetif->prxs[idx].statusinfo = 0xFFFFFFFF;
lpc_enetif->prxs[idx].statushashcrc = 0xFFFFFFFF;
/* Save pbuf pointer for push to network layer later */
lpc_enetif->rxb[idx] = p;
/* Wrap at end of descriptor list */
idx++;
if (idx >= LPC_NUM_BUFF_RXDESCS)
idx = 0;
/* Queue descriptor(s) */
lpc_enetif->rx_free_descs -= 1;
lpc_enetif->rx_fill_desc_index = idx;
LPC_EMAC->RxConsumeIndex = idx;
LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
("lpc_rxqueue_pbuf: pbuf packet queued: %p (free desc=%d)\n", p,
lpc_enetif->rx_free_descs));
}
/** \brief Attempt to allocate and requeue a new pbuf for RX
*
* \param[in] netif Pointer to the netif structure
* \returns 1 if a packet was allocated and requeued, otherwise 0
*/
s32_t lpc_rx_queue(struct netif *netif)
{
struct lpc_enetdata *lpc_enetif = netif->state;
struct pbuf *p;
s32_t queued = 0;
/* Attempt to requeue as many packets as possible */
while (lpc_enetif->rx_free_descs > 0) {
/* Allocate a pbuf from the pool. We need to allocate at the
maximum size as we don't know the size of the yet to be
received packet. */
p = pbuf_alloc(PBUF_RAW, (u16_t) EMAC_ETH_MAX_FLEN, PBUF_RAM);
if (p == NULL) {
LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
("lpc_rx_queue: could not allocate RX pbuf (free desc=%d)\n",
lpc_enetif->rx_free_descs));
return queued;
}
/* pbufs allocated from the RAM pool should be non-chained. */
LWIP_ASSERT("lpc_rx_queue: pbuf is not contiguous (chained)",
pbuf_clen(p) <= 1);
/* Queue packet */
lpc_rxqueue_pbuf(lpc_enetif, p);
/* Update queued count */
queued++;
}
return queued;
}
/** \brief Sets up the RX descriptor ring buffers.
*
* This function sets up the descriptor list used for receive packets.
*
* \param[in] lpc_enetif Pointer to driver data structure
* \returns Always returns ERR_OK
*/
static err_t lpc_rx_setup(struct lpc_enetdata *lpc_enetif)
{
/* Setup pointers to RX structures */
LPC_EMAC->RxDescriptor = (u32_t) &lpc_enetif->prxd[0];
LPC_EMAC->RxStatus = (u32_t) &lpc_enetif->prxs[0];
LPC_EMAC->RxDescriptorNumber = LPC_NUM_BUFF_RXDESCS - 1;
lpc_enetif->rx_free_descs = LPC_NUM_BUFF_RXDESCS;
lpc_enetif->rx_fill_desc_index = 0;
/* Build RX buffer and descriptors */
lpc_rx_queue(lpc_enetif->netif);
return ERR_OK;
}
/** \brief Allocates a pbuf and returns the data from the incoming packet.
*
* \param[in] netif the lwip network interface structure for this lpc_enetif
* \return a pbuf filled with the received packet (including MAC header)
* NULL on memory error
*/
static struct pbuf *lpc_low_level_input(struct netif *netif)
{
struct lpc_enetdata *lpc_enetif = netif->state;
struct pbuf *p = NULL;
u32_t idx, length;
u16_t origLength;
#ifdef LOCK_RX_THREAD
#if NO_SYS == 0
/* Get exclusive access */
sys_mutex_lock(&lpc_enetif->TXLockMutex);
#endif
#endif
/* Monitor RX overrun status. This should never happen unless
(possibly) the internal bus is behing held up by something.
Unless your system is running at a very low clock speed or
there are possibilities that the internal buses may be held
up for a long time, this can probably safely be removed. */
if (LPC_EMAC->IntStatus & EMAC_INT_RX_OVERRUN) {
LINK_STATS_INC(link.err);
LINK_STATS_INC(link.drop);
/* Temporarily disable RX */
LPC_EMAC->MAC1 &= ~EMAC_MAC1_REC_EN;
/* Reset the RX side */
LPC_EMAC->MAC1 |= EMAC_MAC1_RES_RX;
LPC_EMAC->IntClear = EMAC_INT_RX_OVERRUN;
/* De-allocate all queued RX pbufs */
for (idx = 0; idx < LPC_NUM_BUFF_RXDESCS; idx++) {
if (lpc_enetif->rxb[idx] != NULL) {
pbuf_free(lpc_enetif->rxb[idx]);
lpc_enetif->rxb[idx] = NULL;
}
}
/* Start RX side again */
lpc_rx_setup(lpc_enetif);
/* Re-enable RX */
LPC_EMAC->MAC1 |= EMAC_MAC1_REC_EN;
#ifdef LOCK_RX_THREAD
#if NO_SYS == 0
sys_mutex_unlock(&lpc_enetif->TXLockMutex);
#endif
#endif
return NULL;
}
/* Determine if a frame has been received */
length = 0;
idx = LPC_EMAC->RxConsumeIndex;
if (LPC_EMAC->RxProduceIndex != idx) {
/* Handle errors */
if (lpc_enetif->prxs[idx].statusinfo & (EMAC_RINFO_CRC_ERR |
EMAC_RINFO_SYM_ERR | EMAC_RINFO_ALIGN_ERR | EMAC_RINFO_LEN_ERR)) {
#if LINK_STATS
if (lpc_enetif->prxs[idx].statusinfo & (EMAC_RINFO_CRC_ERR |
EMAC_RINFO_SYM_ERR | EMAC_RINFO_ALIGN_ERR))
LINK_STATS_INC(link.chkerr);
if (lpc_enetif->prxs[idx].statusinfo & EMAC_RINFO_LEN_ERR)
LINK_STATS_INC(link.lenerr);
#endif
/* Drop the frame */
LINK_STATS_INC(link.drop);
/* Re-queue the pbuf for receive */
lpc_enetif->rx_free_descs++;
p = lpc_enetif->rxb[idx];
lpc_enetif->rxb[idx] = NULL;
lpc_rxqueue_pbuf(lpc_enetif, p);
LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
("lpc_low_level_input: Packet dropped with errors (0x%x)\n",
lpc_enetif->prxs[idx].statusinfo));
p = NULL;
} else {
/* A packet is waiting, get length */
length = (lpc_enetif->prxs[idx].statusinfo & 0x7FF) + 1;
/* Zero-copy */
p = lpc_enetif->rxb[idx];
origLength = p->len;
p->len = (u16_t) length;
/* Free pbuf from descriptor */
lpc_enetif->rxb[idx] = NULL;
lpc_enetif->rx_free_descs++;
/* Attempt to queue new buffer(s) */
if (lpc_rx_queue(lpc_enetif->netif) == 0) {
/* Drop the frame due to OOM. */
LINK_STATS_INC(link.drop);
/* Re-queue the pbuf for receive */
p->len = origLength;
lpc_rxqueue_pbuf(lpc_enetif, p);
LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
("lpc_low_level_input: Packet index %d dropped for OOM\n",
idx));
#ifdef LOCK_RX_THREAD
#if NO_SYS == 0
sys_mutex_unlock(&lpc_enetif->TXLockMutex);
#endif
#endif
return NULL;
}
LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
("lpc_low_level_input: Packet received: %p, size %d (index=%d)\n",
p, length, idx));
/* Save size */
p->tot_len = (u16_t) length;
LINK_STATS_INC(link.recv);
}
}
#ifdef LOCK_RX_THREAD
#if NO_SYS == 0
sys_mutex_unlock(&lpc_enetif->TXLockMutex);
#endif
#endif
return p;
}
/** \brief Attempt to read a packet from the EMAC interface.
*
* \param[in] netif the lwip network interface structure for this lpc_enetif
*/
void lpc_enetif_input(struct netif *netif)
{
struct eth_hdr *ethhdr;
struct pbuf *p;
/* move received packet into a new pbuf */
p = lpc_low_level_input(netif);
if (p == NULL)
return;
/* points to packet payload, which starts with an Ethernet header */
ethhdr = p->payload;
switch (htons(ethhdr->type)) {
case ETHTYPE_IP:
case ETHTYPE_ARP:
#if PPPOE_SUPPORT
case ETHTYPE_PPPOEDISC:
case ETHTYPE_PPPOE:
#endif /* PPPOE_SUPPORT */
/* full packet send to tcpip_thread to process */
if (netif->input(p, netif) != ERR_OK) {
LWIP_DEBUGF(NETIF_DEBUG, ("lpc_enetif_input: IP input error\n"));
/* Free buffer */
pbuf_free(p);
}
break;
default:
/* Return buffer */
pbuf_free(p);
break;
}
}
/** \brief Determine if the passed address is usable for the ethernet
* DMA controller.
*
* \param[in] addr Address of packet to check for DMA safe operation
* \return 1 if the packet address is not safe, otherwise 0
*/
static s32_t lpc_packet_addr_notsafe(void *addr) {
/* Check for legal address ranges */
#if defined(TARGET_LPC1768)
if ((((u32_t) addr >= 0x2007C000) && ((u32_t) addr < 0x20083FFF))) {
#elif defined(TARGET_LPC4088)
if ((((u32_t) addr >= 0x20000000) && ((u32_t) addr < 0x20007FFF))) {
#endif
return 0;
}
return 1;
}
/** \brief Sets up the TX descriptor ring buffers.
*
* This function sets up the descriptor list used for transmit packets.
*
* \param[in] lpc_enetif Pointer to driver data structure
*/
static err_t lpc_tx_setup(struct lpc_enetdata *lpc_enetif)
{
s32_t idx;
/* Build TX descriptors for local buffers */
for (idx = 0; idx < LPC_NUM_BUFF_TXDESCS; idx++) {
lpc_enetif->ptxd[idx].control = 0;
lpc_enetif->ptxs[idx].statusinfo = 0xFFFFFFFF;
}
/* Setup pointers to TX structures */
LPC_EMAC->TxDescriptor = (u32_t) &lpc_enetif->ptxd[0];
LPC_EMAC->TxStatus = (u32_t) &lpc_enetif->ptxs[0];
LPC_EMAC->TxDescriptorNumber = LPC_NUM_BUFF_TXDESCS - 1;
lpc_enetif->lpc_last_tx_idx = 0;
return ERR_OK;
}
/** \brief Free TX buffers that are complete
*
* \param[in] lpc_enetif Pointer to driver data structure
* \param[in] cidx EMAC current descriptor comsumer index
*/
static void lpc_tx_reclaim_st(struct lpc_enetdata *lpc_enetif, u32_t cidx)
{
#if NO_SYS == 0
/* Get exclusive access */
sys_mutex_lock(&lpc_enetif->TXLockMutex);
#endif
while (cidx != lpc_enetif->lpc_last_tx_idx) {
if (lpc_enetif->txb[lpc_enetif->lpc_last_tx_idx] != NULL) {
LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
("lpc_tx_reclaim_st: Freeing packet %p (index %d)\n",
lpc_enetif->txb[lpc_enetif->lpc_last_tx_idx],
lpc_enetif->lpc_last_tx_idx));
pbuf_free(lpc_enetif->txb[lpc_enetif->lpc_last_tx_idx]);
lpc_enetif->txb[lpc_enetif->lpc_last_tx_idx] = NULL;
}
#if NO_SYS == 0
osSemaphoreRelease(lpc_enetif->xTXDCountSem.id);
#endif
lpc_enetif->lpc_last_tx_idx++;
if (lpc_enetif->lpc_last_tx_idx >= LPC_NUM_BUFF_TXDESCS)
lpc_enetif->lpc_last_tx_idx = 0;
}
#if NO_SYS == 0
/* Restore access */
sys_mutex_unlock(&lpc_enetif->TXLockMutex);
#endif
}
/** \brief User call for freeingTX buffers that are complete
*
* \param[in] netif the lwip network interface structure for this lpc_enetif
*/
void lpc_tx_reclaim(struct netif *netif)
{
lpc_tx_reclaim_st((struct lpc_enetdata *) netif->state,
LPC_EMAC->TxConsumeIndex);
}
/** \brief Polls if an available TX descriptor is ready. Can be used to
* determine if the low level transmit function will block.
*
* \param[in] netif the lwip network interface structure for this lpc_enetif
* \return 0 if no descriptors are read, or >0
*/
s32_t lpc_tx_ready(struct netif *netif)
{
s32_t fb;
u32_t idx, cidx;
cidx = LPC_EMAC->TxConsumeIndex;
idx = LPC_EMAC->TxProduceIndex;
/* Determine number of free buffers */
if (idx == cidx)
fb = LPC_NUM_BUFF_TXDESCS;
else if (cidx > idx)
fb = (LPC_NUM_BUFF_TXDESCS - 1) -
((idx + LPC_NUM_BUFF_TXDESCS) - cidx);
else
fb = (LPC_NUM_BUFF_TXDESCS - 1) - (cidx - idx);
return fb;
}
/** \brief Low level output of a packet. Never call this from an
* interrupt context, as it may block until TX descriptors
* become available.
*
* \param[in] netif the lwip network interface structure for this lpc_enetif
* \param[in] p the MAC packet to send (e.g. IP packet including MAC addresses and type)
* \return ERR_OK if the packet could be sent or an err_t value if the packet couldn't be sent
*/
static err_t lpc_low_level_output(struct netif *netif, struct pbuf *p)
{
struct lpc_enetdata *lpc_enetif = netif->state;
struct pbuf *q;
u8_t *dst;
u32_t idx, notdmasafe = 0;
struct pbuf *np;
s32_t dn;
/* Zero-copy TX buffers may be fragmented across mutliple payload
chains. Determine the number of descriptors needed for the
transfer. The pbuf chaining can be a mess! */
dn = (s32_t) pbuf_clen(p);
/* Test to make sure packet addresses are DMA safe. A DMA safe
address is once that uses external memory or periphheral RAM.
IRAM and FLASH are not safe! */
for (q = p; q != NULL; q = q->next)
notdmasafe += lpc_packet_addr_notsafe(q->payload);
#if LPC_TX_PBUF_BOUNCE_EN==1
/* If the pbuf is not DMA safe, a new bounce buffer (pbuf) will be
created that will be used instead. This requires an copy from the
non-safe DMA region to the new pbuf */
if (notdmasafe) {
/* Allocate a pbuf in DMA memory */
np = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
if (np == NULL)
return ERR_MEM;
/* This buffer better be contiguous! */
LWIP_ASSERT("lpc_low_level_output: New transmit pbuf is chained",
(pbuf_clen(np) == 1));
/* Copy to DMA safe pbuf */
dst = (u8_t *) np->payload;
for(q = p; q != NULL; q = q->next) {
/* Copy the buffer to the descriptor's buffer */
MEMCPY(dst, (u8_t *) q->payload, q->len);
dst += q->len;
}
np->len = p->tot_len;
LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
("lpc_low_level_output: Switched to DMA safe buffer, old=%p, new=%p\n",
q, np));
/* use the new buffer for descrptor queueing. The original pbuf will
be de-allocated outsuide this driver. */
p = np;
dn = 1;
}
#else
if (notdmasafe)
LWIP_ASSERT("lpc_low_level_output: Not a DMA safe pbuf",
(notdmasafe == 0));
#endif
/* Wait until enough descriptors are available for the transfer. */
/* THIS WILL BLOCK UNTIL THERE ARE ENOUGH DESCRIPTORS AVAILABLE */
while (dn > lpc_tx_ready(netif))
#if NO_SYS == 0
osSemaphoreWait(lpc_enetif->xTXDCountSem.id, osWaitForever);
#else
osDelay(1);
#endif
/* Get free TX buffer index */
idx = LPC_EMAC->TxProduceIndex;
#if NO_SYS == 0
/* Get exclusive access */
sys_mutex_lock(&lpc_enetif->TXLockMutex);
#endif
/* Prevent LWIP from de-allocating this pbuf. The driver will
free it once it's been transmitted. */
if (!notdmasafe)
pbuf_ref(p);
/* Setup transfers */
q = p;
while (dn > 0) {
dn--;
/* Only save pointer to free on last descriptor */
if (dn == 0) {
/* Save size of packet and signal it's ready */
lpc_enetif->ptxd[idx].control = (q->len - 1) | EMAC_TCTRL_INT |
EMAC_TCTRL_LAST;
lpc_enetif->txb[idx] = p;
}
else {
/* Save size of packet, descriptor is not last */
lpc_enetif->ptxd[idx].control = (q->len - 1) | EMAC_TCTRL_INT;
lpc_enetif->txb[idx] = NULL;
}
LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
("lpc_low_level_output: pbuf packet(%p) sent, chain#=%d,"
" size = %d (index=%d)\n", q->payload, dn, q->len, idx));
lpc_enetif->ptxd[idx].packet = (u32_t) q->payload;
q = q->next;
idx++;
if (idx >= LPC_NUM_BUFF_TXDESCS)
idx = 0;
}
LPC_EMAC->TxProduceIndex = idx;
LINK_STATS_INC(link.xmit);
#if NO_SYS == 0
/* Restore access */
sys_mutex_unlock(&lpc_enetif->TXLockMutex);
#endif
return ERR_OK;
}
/** \brief LPC EMAC interrupt handler.
*
* This function handles the transmit, receive, and error interrupt of
* the LPC177x_8x. This is meant to be used when NO_SYS=0.
*/
void ENET_IRQHandler(void)
{
#if NO_SYS == 1
/* Interrupts are not used without an RTOS */
NVIC_DisableIRQ(ENET_IRQn);
#else
uint32_t ints;
/* Interrupts are of 2 groups - transmit or receive. Based on the
interrupt, kick off the receive or transmit (cleanup) task */
/* Get pending interrupts */
ints = LPC_EMAC->IntStatus;
if (ints & RXINTGROUP) {
/* RX group interrupt(s): Give signal to wakeup RX receive task.*/
osSignalSet(lpc_enetdata.RxThread->id, RX_SIGNAL);
}
if (ints & TXINTGROUP) {
/* TX group interrupt(s): Give semaphore to wakeup TX cleanup task. */
sys_sem_signal(&lpc_enetdata.TxCleanSem);
}
/* Clear pending interrupts */
LPC_EMAC->IntClear = ints;
#endif
}
#if NO_SYS == 0
/** \brief Packet reception task
*
* This task is called when a packet is received. It will
* pass the packet to the LWIP core.
*
* \param[in] pvParameters Not used yet
*/
static void packet_rx(void* pvParameters) {
struct lpc_enetdata *lpc_enetif = pvParameters;
while (1) {
/* Wait for receive task to wakeup */
osSignalWait(RX_SIGNAL, osWaitForever);
/* Process packets until all empty */
while (LPC_EMAC->RxConsumeIndex != LPC_EMAC->RxProduceIndex)
lpc_enetif_input(lpc_enetif->netif);
}
}
/** \brief Transmit cleanup task
*
* This task is called when a transmit interrupt occurs and
* reclaims the pbuf and descriptor used for the packet once
* the packet has been transferred.
*
* \param[in] pvParameters Not used yet
*/
static void packet_tx(void* pvParameters) {
struct lpc_enetdata *lpc_enetif = pvParameters;
s32_t idx;
while (1) {
/* Wait for transmit cleanup task to wakeup */
sys_arch_sem_wait(&lpc_enetif->TxCleanSem, 0);
/* Error handling for TX underruns. This should never happen unless
something is holding the bus or the clocks are going too slow. It
can probably be safely removed. */
if (LPC_EMAC->IntStatus & EMAC_INT_TX_UNDERRUN) {
LINK_STATS_INC(link.err);
LINK_STATS_INC(link.drop);
#if NO_SYS == 0
/* Get exclusive access */
sys_mutex_lock(&lpc_enetif->TXLockMutex);
#endif
/* Reset the TX side */
LPC_EMAC->MAC1 |= EMAC_MAC1_RES_TX;
LPC_EMAC->IntClear = EMAC_INT_TX_UNDERRUN;
/* De-allocate all queued TX pbufs */
for (idx = 0; idx < LPC_NUM_BUFF_TXDESCS; idx++) {
if (lpc_enetif->txb[idx] != NULL) {
pbuf_free(lpc_enetif->txb[idx]);
lpc_enetif->txb[idx] = NULL;
}
}
#if NO_SYS == 0
/* Restore access */
sys_mutex_unlock(&lpc_enetif->TXLockMutex);
#endif
/* Start TX side again */
lpc_tx_setup(lpc_enetif);
} else {
/* Free TX buffers that are done sending */
lpc_tx_reclaim(lpc_enetdata.netif);
}
}
}
#endif
/** \brief Low level init of the MAC and PHY.
*
* \param[in] netif Pointer to LWIP netif structure
*/
static err_t low_level_init(struct netif *netif)
{
struct lpc_enetdata *lpc_enetif = netif->state;
err_t err = ERR_OK;
/* Enable MII clocking */
LPC_SC->PCONP |= CLKPWR_PCONP_PCENET;
#if defined(TARGET_LPC1768)
LPC_PINCON->PINSEL2 = 0x50150105; /* Enable P1 Ethernet Pins. */
LPC_PINCON->PINSEL3 = (LPC_PINCON->PINSEL3 & ~0x0000000F) | 0x00000005;
#elif defined(TARGET_LPC4088)
LPC_IOCON->P1_0 &= ~0x07; /* ENET I/O config */
LPC_IOCON->P1_0 |= 0x01; /* ENET_TXD0 */
LPC_IOCON->P1_1 &= ~0x07;
LPC_IOCON->P1_1 |= 0x01; /* ENET_TXD1 */
LPC_IOCON->P1_4 &= ~0x07;
LPC_IOCON->P1_4 |= 0x01; /* ENET_TXEN */
LPC_IOCON->P1_8 &= ~0x07;
LPC_IOCON->P1_8 |= 0x01; /* ENET_CRS */
LPC_IOCON->P1_9 &= ~0x07;
LPC_IOCON->P1_9 |= 0x01; /* ENET_RXD0 */
LPC_IOCON->P1_10 &= ~0x07;
LPC_IOCON->P1_10 |= 0x01; /* ENET_RXD1 */
LPC_IOCON->P1_14 &= ~0x07;
LPC_IOCON->P1_14 |= 0x01; /* ENET_RX_ER */
LPC_IOCON->P1_15 &= ~0x07;
LPC_IOCON->P1_15 |= 0x01; /* ENET_REF_CLK */
LPC_IOCON->P1_16 &= ~0x07; /* ENET/PHY I/O config */
LPC_IOCON->P1_16 |= 0x01; /* ENET_MDC */
LPC_IOCON->P1_17 &= ~0x07;
LPC_IOCON->P1_17 |= 0x01; /* ENET_MDIO */
#endif
/* Reset all MAC logic */
LPC_EMAC->MAC1 = EMAC_MAC1_RES_TX | EMAC_MAC1_RES_MCS_TX |
EMAC_MAC1_RES_RX | EMAC_MAC1_RES_MCS_RX | EMAC_MAC1_SIM_RES |
EMAC_MAC1_SOFT_RES;
LPC_EMAC->Command = EMAC_CR_REG_RES | EMAC_CR_TX_RES | EMAC_CR_RX_RES |
EMAC_CR_PASS_RUNT_FRM;
osDelay(10);
/* Initial MAC initialization */
LPC_EMAC->MAC1 = EMAC_MAC1_PASS_ALL;
LPC_EMAC->MAC2 = EMAC_MAC2_CRC_EN | EMAC_MAC2_PAD_EN |
EMAC_MAC2_VLAN_PAD_EN;
LPC_EMAC->MAXF = EMAC_ETH_MAX_FLEN;
/* Set RMII management clock rate to lowest speed */
LPC_EMAC->MCFG = EMAC_MCFG_CLK_SEL(11) | EMAC_MCFG_RES_MII;
LPC_EMAC->MCFG &= ~EMAC_MCFG_RES_MII;
/* Maximum number of retries, 0x37 collision window, gap */
LPC_EMAC->CLRT = EMAC_CLRT_DEF;
LPC_EMAC->IPGR = EMAC_IPGR_P1_DEF | EMAC_IPGR_P2_DEF;
#if LPC_EMAC_RMII
/* RMII setup */
LPC_EMAC->Command = EMAC_CR_PASS_RUNT_FRM | EMAC_CR_RMII;
#else
/* MII setup */
LPC_EMAC->CR = EMAC_CR_PASS_RUNT_FRM;
#endif
/* Initialize the PHY and reset */
err = lpc_phy_init(netif, LPC_EMAC_RMII);
if (err != ERR_OK)
return err;
/* Save station address */
LPC_EMAC->SA2 = (u32_t) netif->hwaddr[0] |
(((u32_t) netif->hwaddr[1]) << 8);
LPC_EMAC->SA1 = (u32_t) netif->hwaddr[2] |
(((u32_t) netif->hwaddr[3]) << 8);
LPC_EMAC->SA0 = (u32_t) netif->hwaddr[4] |
(((u32_t) netif->hwaddr[5]) << 8);
/* Setup transmit and receive descriptors */
if (lpc_tx_setup(lpc_enetif) != ERR_OK)
return ERR_BUF;
if (lpc_rx_setup(lpc_enetif) != ERR_OK)
return ERR_BUF;
/* Enable packet reception */
#if IP_SOF_BROADCAST_RECV
LPC_EMAC->RxFilterCtrl = EMAC_RFC_PERFECT_EN | EMAC_RFC_BCAST_EN | EMAC_RFC_MCAST_EN;
#else
LPC_EMAC->RxFilterCtrl = EMAC_RFC_PERFECT_EN;
#endif
/* Clear and enable rx/tx interrupts */
LPC_EMAC->IntClear = 0xFFFF;
LPC_EMAC->IntEnable = RXINTGROUP | TXINTGROUP;
/* Enable RX and TX */
LPC_EMAC->Command |= EMAC_CR_RX_EN | EMAC_CR_TX_EN;
LPC_EMAC->MAC1 |= EMAC_MAC1_REC_EN;
return err;
}
/* This function provides a method for the PHY to setup the EMAC
for the PHY negotiated duplex mode */
void lpc_emac_set_duplex(int full_duplex)
{
if (full_duplex) {
LPC_EMAC->MAC2 |= EMAC_MAC2_FULL_DUP;
LPC_EMAC->Command |= EMAC_CR_FULL_DUP;
LPC_EMAC->IPGT = EMAC_IPGT_FULL_DUP;
} else {
LPC_EMAC->MAC2 &= ~EMAC_MAC2_FULL_DUP;
LPC_EMAC->Command &= ~EMAC_CR_FULL_DUP;
LPC_EMAC->IPGT = EMAC_IPGT_HALF_DUP;
}
}
/* This function provides a method for the PHY to setup the EMAC
for the PHY negotiated bit rate */
void lpc_emac_set_speed(int mbs_100)
{
if (mbs_100)
LPC_EMAC->SUPP = EMAC_SUPP_SPEED;
else
LPC_EMAC->SUPP = 0;
}
/**
* This function is the ethernet packet send function. It calls
* etharp_output after checking link status.
*
* \param[in] netif the lwip network interface structure for this lpc_enetif
* \param[in] q Pointer to pbug to send
* \param[in] ipaddr IP address
* \return ERR_OK or error code
*/
err_t lpc_etharp_output(struct netif *netif, struct pbuf *q,
ip_addr_t *ipaddr)
{
/* Only send packet is link is up */
if (netif->flags & NETIF_FLAG_LINK_UP)
return etharp_output(netif, q, ipaddr);
return ERR_CONN;
}
#if NO_SYS == 0
/* periodic PHY status update */
void phy_update(void const *nif) {
lpc_phy_sts_sm((struct netif*)nif);
}
osTimerDef(phy_update, phy_update);
#endif
/**
* Should be called at the beginning of the program to set up the
* network interface.
*
* This function should be passed as a parameter to netif_add().
*
* @param[in] netif the lwip network interface structure for this lpc_enetif
* @return ERR_OK if the loopif is initialized
* ERR_MEM if private data couldn't be allocated
* any other err_t on error
*/
err_t eth_arch_enetif_init(struct netif *netif)
{
err_t err;
LWIP_ASSERT("netif != NULL", (netif != NULL));
lpc_enetdata.netif = netif;
/* set MAC hardware address */
#if (MBED_MAC_ADDRESS_SUM != MBED_MAC_ADDR_INTERFACE)
netif->hwaddr[0] = MBED_MAC_ADDR_0;
netif->hwaddr[1] = MBED_MAC_ADDR_1;
netif->hwaddr[2] = MBED_MAC_ADDR_2;
netif->hwaddr[3] = MBED_MAC_ADDR_3;
netif->hwaddr[4] = MBED_MAC_ADDR_4;
netif->hwaddr[5] = MBED_MAC_ADDR_5;
#else
mbed_mac_address((char *)netif->hwaddr);
#endif
netif->hwaddr_len = ETHARP_HWADDR_LEN;
/* maximum transfer unit */
netif->mtu = 1500;
/* device capabilities */
netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET | NETIF_FLAG_IGMP;
/* Initialize the hardware */
netif->state = &lpc_enetdata;
err = low_level_init(netif);
if (err != ERR_OK)
return err;
#if LWIP_NETIF_HOSTNAME
/* Initialize interface hostname */
netif->hostname = "lwiplpc";
#endif /* LWIP_NETIF_HOSTNAME */
netif->name[0] = 'e';
netif->name[1] = 'n';
netif->output = lpc_etharp_output;
netif->linkoutput = lpc_low_level_output;
/* CMSIS-RTOS, start tasks */
#if NO_SYS == 0
#ifdef CMSIS_OS_RTX
memset(lpc_enetdata.xTXDCountSem.data, 0, sizeof(lpc_enetdata.xTXDCountSem.data));
lpc_enetdata.xTXDCountSem.def.semaphore = lpc_enetdata.xTXDCountSem.data;
#endif
lpc_enetdata.xTXDCountSem.id = osSemaphoreCreate(&lpc_enetdata.xTXDCountSem.def, LPC_NUM_BUFF_TXDESCS);
LWIP_ASSERT("xTXDCountSem creation error", (lpc_enetdata.xTXDCountSem.id != NULL));
err = sys_mutex_new(&lpc_enetdata.TXLockMutex);
LWIP_ASSERT("TXLockMutex creation error", (err == ERR_OK));
/* Packet receive task */
lpc_enetdata.RxThread = sys_thread_new("receive_thread", packet_rx, netif->state, DEFAULT_THREAD_STACKSIZE, RX_PRIORITY);
LWIP_ASSERT("RxThread creation error", (lpc_enetdata.RxThread));
/* Transmit cleanup task */
err = sys_sem_new(&lpc_enetdata.TxCleanSem, 0);
LWIP_ASSERT("TxCleanSem creation error", (err == ERR_OK));
sys_thread_new("txclean_thread", packet_tx, netif->state, DEFAULT_THREAD_STACKSIZE, TX_PRIORITY);
/* periodic PHY status update */
osTimerId phy_timer = osTimerCreate(osTimer(phy_update), osTimerPeriodic, (void *)netif);
osTimerStart(phy_timer, 250);
#endif
return ERR_OK;
}
void eth_arch_enable_interrupts(void) {
NVIC_SetPriority(ENET_IRQn, ((0x01 << 3) | 0x01));
NVIC_EnableIRQ(ENET_IRQn);
}
void eth_arch_disable_interrupts(void) {
NVIC_DisableIRQ(ENET_IRQn);
}
/**
* @}
*/
/* --------------------------------- End Of File ------------------------------ */
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