artiq/soc/runtime/liblwip/netif/liteethif.c

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// This file is Copyright (c) 2015 Florent Kermarrec <florent@enjoy-digital.fr>
// LiteETH lwIP port for ARTIQ
// License: BSD
#include <lwip/opt.h>
#include <lwip/mem.h>
#include <netif/etharp.h>
#include "netif/liteethif.h"
#include <generated/csr.h>
#include <hw/flags.h>
#include <hw/ethmac_mem.h>
typedef union {
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unsigned char raw[1514];
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} ethernet_buffer;
static unsigned int rxslot;
static unsigned int rxlen;
static ethernet_buffer *rxbuffer;
static ethernet_buffer *rxbuffer0;
static ethernet_buffer *rxbuffer1;
static unsigned int txslot;
static unsigned int txlen;
static ethernet_buffer *txbuffer;
static ethernet_buffer *txbuffer0;
static ethernet_buffer *txbuffer1;
#define IFNAME0 'e'
#define IFNAME1 't'
static void liteeth_low_level_init(struct netif *netif)
{
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int i;
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netif->hwaddr_len = 6;
for(i=0;i<netif->hwaddr_len;i++)
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netif->hwaddr[i] = macadr[i];
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netif->mtu = 1514;
netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP;
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ethmac_sram_reader_ev_pending_write(ETHMAC_EV_SRAM_READER);
ethmac_sram_writer_ev_pending_write(ETHMAC_EV_SRAM_WRITER);
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rxbuffer0 = (ethernet_buffer *)ETHMAC_RX0_BASE;
rxbuffer1 = (ethernet_buffer *)ETHMAC_RX1_BASE;
txbuffer0 = (ethernet_buffer *)ETHMAC_TX0_BASE;
txbuffer1 = (ethernet_buffer *)ETHMAC_TX1_BASE;
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rxslot = 0;
txslot = 0;
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rxbuffer = rxbuffer0;
txbuffer = txbuffer0;
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}
static err_t liteeth_low_level_output(struct netif *netif, struct pbuf *p)
{
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struct pbuf *q;
txlen = 0;
for(q = p; q != NULL; q = q->next) {
memcpy(txbuffer->raw, q->payload, q->len);
txbuffer += q->len;
txlen += q->len;
}
ethmac_sram_reader_slot_write(txslot);
ethmac_sram_reader_length_write(txlen);
while(!ethmac_sram_reader_ready_read());
ethmac_sram_reader_start_write(1);
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txslot = (txslot + 1) % 2;
if(txslot)
txbuffer = txbuffer1;
else
txbuffer = txbuffer0;
return ERR_OK;
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}
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static struct pbuf *liteeth_low_level_input(struct netif *netif)
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{
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struct pbuf *p, *q;
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rxslot = ethmac_sram_writer_slot_read();
rxlen = ethmac_sram_writer_length_read();
if(rxslot)
rxbuffer = rxbuffer1;
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else
rxbuffer = rxbuffer0;
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p = pbuf_alloc(PBUF_RAW, rxlen, PBUF_POOL);
if(p != NULL) {
for(q = p; q != NULL; q = q->next) {
memcpy(q->payload, rxbuffer->raw, q->len);
rxbuffer += q->len;
}
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}
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return p;
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}
void liteeth_input(struct netif *netif)
{
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struct pbuf *p;
p = liteeth_low_level_input(netif);
if(p != NULL)
netif->input(p, netif);
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}
err_t liteeth_init(struct netif *netif)
{
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struct liteethif *liteethif;
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liteethif = mem_malloc(sizeof(struct liteethif));
if(liteethif == NULL)
return ERR_MEM;
netif->state = liteethif;
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netif->hwaddr_len = 6;
netif->name[0] = IFNAME0;
netif->name[1] = IFNAME1;
netif->output = etharp_output;
netif->linkoutput = liteeth_low_level_output;
netif->mtu = 1514;
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liteethif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
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liteeth_low_level_init(netif);
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return ERR_OK;
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}