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