/* * File: scc.c * Description: * Basic ET HW initialization and packet RX/TX routines * * NOTE <<>>: * Do not cache Rx/Tx buffers! */ /* * MPC823 <-> MC68160 Connections: * * Setup MPC823 to work with MC68160 Enhanced Ethernet * Serial Tranceiver as follows: * * MPC823 Signal MC68160 Comments * ------ ------ ------- -------- * PA-12 ETHTX --------> TX Eth. Port Transmit Data * PB-18 E_TENA --------> TENA Eth. Transmit Port Enable * PA-5 ETHTCK <-------- TCLK Eth. Port Transmit Clock * PA-13 ETHRX <-------- RX Eth. Port Receive Data * PC-8 E_RENA <-------- RENA Eth. Receive Enable * PA-6 ETHRCK <-------- RCLK Eth. Port Receive Clock * PC-9 E_CLSN <-------- CLSN Eth. Port Collision Indication * * FADS Board Signal MC68160 Comments * ----------------- ------- -------- * (BCSR1) ETHEN* --------> CS2 Eth. Port Enable * (BSCR4) TPSQEL* --------> TPSQEL Twisted Pair Signal Quality Error Test Enable * (BCSR4) TPFLDL* --------> TPFLDL Twisted Pair Full-Duplex * (BCSR4) ETHLOOP --------> LOOP Eth. Port Diagnostic Loop-Back * */ #include #include #include #include #include #if defined(CONFIG_CMD_NET) && defined(SCC_ENET) /* Ethernet Transmit and Receive Buffers */ #define DBUF_LENGTH 1520 #define TX_BUF_CNT 2 #define TOUT_LOOP 10000 /* 10 ms to have a packet sent */ static char txbuf[DBUF_LENGTH]; static uint rxIdx; /* index of the current RX buffer */ static uint txIdx; /* index of the current TX buffer */ /* * SCC Ethernet Tx and Rx buffer descriptors allocated at the * immr->udata_bd address on Dual-Port RAM * Provide for Double Buffering */ typedef volatile struct CommonBufferDescriptor { cbd_t rxbd[PKTBUFSRX]; /* Rx BD */ cbd_t txbd[TX_BUF_CNT]; /* Tx BD */ } RTXBD; static RTXBD *rtx; static int scc_send(struct eth_device *dev, void *packet, int length); static int scc_recv(struct eth_device* dev); static int scc_init (struct eth_device* dev, bd_t * bd); static void scc_halt(struct eth_device* dev); int scc_initialize(bd_t *bis) { struct eth_device* dev; dev = (struct eth_device*) malloc(sizeof *dev); memset(dev, 0, sizeof *dev); strcpy(dev->name, "SCC"); dev->iobase = 0; dev->priv = 0; dev->init = scc_init; dev->halt = scc_halt; dev->send = scc_send; dev->recv = scc_recv; eth_register(dev); return 1; } static int scc_send(struct eth_device *dev, void *packet, int length) { int i, j=0; #if 0 volatile char *in, *out; #endif /* section 16.9.23.3 * Wait for ready */ #if 0 while (rtx->txbd[txIdx].cbd_sc & BD_ENET_TX_READY); out = (char *)(rtx->txbd[txIdx].cbd_bufaddr); in = packet; for(i = 0; i < length; i++) { *out++ = *in++; } rtx->txbd[txIdx].cbd_datlen = length; rtx->txbd[txIdx].cbd_sc |= (BD_ENET_TX_READY | BD_ENET_TX_LAST); while (rtx->txbd[txIdx].cbd_sc & BD_ENET_TX_READY) j++; #ifdef ET_DEBUG printf("cycles: %d status: %x\n", j, rtx->txbd[txIdx].cbd_sc); #endif i = (rtx->txbd[txIdx++].cbd_sc & BD_ENET_TX_STATS) /* return only status bits */; /* wrap around buffer index when necessary */ if (txIdx >= TX_BUF_CNT) txIdx = 0; #endif while ((rtx->txbd[txIdx].cbd_sc & BD_ENET_TX_READY) && (j=TOUT_LOOP) printf("TX not ready\n"); rtx->txbd[txIdx].cbd_bufaddr = (uint)packet; rtx->txbd[txIdx].cbd_datlen = length; rtx->txbd[txIdx].cbd_sc |= (BD_ENET_TX_READY | BD_ENET_TX_LAST |BD_ENET_TX_WRAP); while ((rtx->txbd[txIdx].cbd_sc & BD_ENET_TX_READY) && (j=TOUT_LOOP) printf("TX timeout\n"); #ifdef ET_DEBUG printf("cycles: %d status: %x\n", j, rtx->txbd[txIdx].cbd_sc); #endif i = (rtx->txbd[txIdx].cbd_sc & BD_ENET_TX_STATS) /* return only status bits */; return i; } static int scc_recv (struct eth_device *dev) { int length; for (;;) { /* section 16.9.23.2 */ if (rtx->rxbd[rxIdx].cbd_sc & BD_ENET_RX_EMPTY) { length = -1; break; /* nothing received - leave for() loop */ } length = rtx->rxbd[rxIdx].cbd_datlen; if (rtx->rxbd[rxIdx].cbd_sc & 0x003f) { #ifdef ET_DEBUG printf ("err: %x\n", rtx->rxbd[rxIdx].cbd_sc); #endif } else { /* Pass the packet up to the protocol layers. */ net_process_received_packet(net_rx_packets[rxIdx], length - 4); } /* Give the buffer back to the SCC. */ rtx->rxbd[rxIdx].cbd_datlen = 0; /* wrap around buffer index when necessary */ if ((rxIdx + 1) >= PKTBUFSRX) { rtx->rxbd[PKTBUFSRX - 1].cbd_sc = (BD_ENET_RX_WRAP | BD_ENET_RX_EMPTY); rxIdx = 0; } else { rtx->rxbd[rxIdx].cbd_sc = BD_ENET_RX_EMPTY; rxIdx++; } } return length; } /************************************************************** * * SCC Ethernet Initialization Routine * *************************************************************/ static int scc_init (struct eth_device *dev, bd_t * bis) { int i; scc_enet_t *pram_ptr; volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR; pram_ptr = (scc_enet_t *) & (immr->im_cpm.cp_dparam[PROFF_ENET]); rxIdx = 0; txIdx = 0; if (!rtx) { #ifdef CONFIG_SYS_ALLOC_DPRAM rtx = (RTXBD *) (immr->im_cpm.cp_dpmem + dpram_alloc_align (sizeof (RTXBD), 8)); #else rtx = (RTXBD *) (immr->im_cpm.cp_dpmem + CPM_SCC_BASE); #endif } #if (defined(PA_ENET_RXD) && defined(PA_ENET_TXD)) /* Configure port A pins for Txd and Rxd. */ immr->im_ioport.iop_papar |= (PA_ENET_RXD | PA_ENET_TXD); immr->im_ioport.iop_padir &= ~(PA_ENET_RXD | PA_ENET_TXD); immr->im_ioport.iop_paodr &= ~PA_ENET_TXD; #elif (defined(PB_ENET_RXD) && defined(PB_ENET_TXD)) /* Configure port B pins for Txd and Rxd. */ immr->im_cpm.cp_pbpar |= (PB_ENET_RXD | PB_ENET_TXD); immr->im_cpm.cp_pbdir &= ~(PB_ENET_RXD | PB_ENET_TXD); immr->im_cpm.cp_pbodr &= ~PB_ENET_TXD; #else #error Configuration Error: exactly ONE of PA_ENET_[RT]XD, PB_ENET_[RT]XD must be defined #endif #if defined(PC_ENET_LBK) /* Configure port C pins to disable External Loopback */ immr->im_ioport.iop_pcpar &= ~PC_ENET_LBK; immr->im_ioport.iop_pcdir |= PC_ENET_LBK; immr->im_ioport.iop_pcso &= ~PC_ENET_LBK; immr->im_ioport.iop_pcdat &= ~PC_ENET_LBK; /* Disable Loopback */ #endif /* PC_ENET_LBK */ /* Configure port C pins to enable CLSN and RENA. */ immr->im_ioport.iop_pcpar &= ~(PC_ENET_CLSN | PC_ENET_RENA); immr->im_ioport.iop_pcdir &= ~(PC_ENET_CLSN | PC_ENET_RENA); immr->im_ioport.iop_pcso |= (PC_ENET_CLSN | PC_ENET_RENA); /* Configure port A for TCLK and RCLK. */ immr->im_ioport.iop_papar |= (PA_ENET_TCLK | PA_ENET_RCLK); immr->im_ioport.iop_padir &= ~(PA_ENET_TCLK | PA_ENET_RCLK); /* * Configure Serial Interface clock routing -- see section 16.7.5.3 * First, clear all SCC bits to zero, then set the ones we want. */ immr->im_cpm.cp_sicr &= ~SICR_ENET_MASK; immr->im_cpm.cp_sicr |= SICR_ENET_CLKRT; /* * Initialize SDCR -- see section 16.9.23.7 * SDMA configuration register */ immr->im_siu_conf.sc_sdcr = 0x01; /* * Setup SCC Ethernet Parameter RAM */ pram_ptr->sen_genscc.scc_rfcr = 0x18; /* Normal Operation and Mot byte ordering */ pram_ptr->sen_genscc.scc_tfcr = 0x18; /* Mot byte ordering, Normal access */ pram_ptr->sen_genscc.scc_mrblr = DBUF_LENGTH; /* max. ET package len 1520 */ pram_ptr->sen_genscc.scc_rbase = (unsigned int) (&rtx->rxbd[0]); /* Set RXBD tbl start at Dual Port */ pram_ptr->sen_genscc.scc_tbase = (unsigned int) (&rtx->txbd[0]); /* Set TXBD tbl start at Dual Port */ /* * Setup Receiver Buffer Descriptors (13.14.24.18) * Settings: * Empty, Wrap */ for (i = 0; i < PKTBUFSRX; i++) { rtx->rxbd[i].cbd_sc = BD_ENET_RX_EMPTY; rtx->rxbd[i].cbd_datlen = 0; /* Reset */ rtx->rxbd[i].cbd_bufaddr = (uint) net_rx_packets[i]; } rtx->rxbd[PKTBUFSRX - 1].cbd_sc |= BD_ENET_RX_WRAP; /* * Setup Ethernet Transmitter Buffer Descriptors (13.14.24.19) * Settings: * Add PADs to Short FRAMES, Wrap, Last, Tx CRC */ for (i = 0; i < TX_BUF_CNT; i++) { rtx->txbd[i].cbd_sc = (BD_ENET_TX_PAD | BD_ENET_TX_LAST | BD_ENET_TX_TC); rtx->txbd[i].cbd_datlen = 0; /* Reset */ rtx->txbd[i].cbd_bufaddr = (uint) (&txbuf[0]); } rtx->txbd[TX_BUF_CNT - 1].cbd_sc |= BD_ENET_TX_WRAP; /* * Enter Command: Initialize Rx Params for SCC */ do { /* Spin until ready to issue command */ __asm__ ("eieio"); } while (immr->im_cpm.cp_cpcr & CPM_CR_FLG); /* Issue command */ immr->im_cpm.cp_cpcr = ((CPM_CR_INIT_RX << 8) | (CPM_CR_ENET << 4) | CPM_CR_FLG); do { /* Spin until command processed */ __asm__ ("eieio"); } while (immr->im_cpm.cp_cpcr & CPM_CR_FLG); /* * Ethernet Specific Parameter RAM * see table 13-16, pg. 660, * pg. 681 (example with suggested settings) */ pram_ptr->sen_cpres = ~(0x0); /* Preset CRC */ pram_ptr->sen_cmask = 0xdebb20e3; /* Constant Mask for CRC */ pram_ptr->sen_crcec = 0x0; /* Error Counter CRC (unused) */ pram_ptr->sen_alec = 0x0; /* Alignment Error Counter (unused) */ pram_ptr->sen_disfc = 0x0; /* Discard Frame Counter (unused) */ pram_ptr->sen_pads = 0x8888; /* Short Frame PAD Characters */ pram_ptr->sen_retlim = 15; /* Retry Limit Threshold */ pram_ptr->sen_maxflr = 1518; /* MAX Frame Length Register */ pram_ptr->sen_minflr = 64; /* MIN Frame Length Register */ pram_ptr->sen_maxd1 = DBUF_LENGTH; /* MAX DMA1 Length Register */ pram_ptr->sen_maxd2 = DBUF_LENGTH; /* MAX DMA2 Length Register */ pram_ptr->sen_gaddr1 = 0x0; /* Group Address Filter 1 (unused) */ pram_ptr->sen_gaddr2 = 0x0; /* Group Address Filter 2 (unused) */ pram_ptr->sen_gaddr3 = 0x0; /* Group Address Filter 3 (unused) */ pram_ptr->sen_gaddr4 = 0x0; /* Group Address Filter 4 (unused) */ #define ea eth_get_ethaddr() pram_ptr->sen_paddrh = (ea[5] << 8) + ea[4]; pram_ptr->sen_paddrm = (ea[3] << 8) + ea[2]; pram_ptr->sen_paddrl = (ea[1] << 8) + ea[0]; #undef ea pram_ptr->sen_pper = 0x0; /* Persistence (unused) */ pram_ptr->sen_iaddr1 = 0x0; /* Individual Address Filter 1 (unused) */ pram_ptr->sen_iaddr2 = 0x0; /* Individual Address Filter 2 (unused) */ pram_ptr->sen_iaddr3 = 0x0; /* Individual Address Filter 3 (unused) */ pram_ptr->sen_iaddr4 = 0x0; /* Individual Address Filter 4 (unused) */ pram_ptr->sen_taddrh = 0x0; /* Tmp Address (MSB) (unused) */ pram_ptr->sen_taddrm = 0x0; /* Tmp Address (unused) */ pram_ptr->sen_taddrl = 0x0; /* Tmp Address (LSB) (unused) */ /* * Enter Command: Initialize Tx Params for SCC */ do { /* Spin until ready to issue command */ __asm__ ("eieio"); } while (immr->im_cpm.cp_cpcr & CPM_CR_FLG); /* Issue command */ immr->im_cpm.cp_cpcr = ((CPM_CR_INIT_TX << 8) | (CPM_CR_ENET << 4) | CPM_CR_FLG); do { /* Spin until command processed */ __asm__ ("eieio"); } while (immr->im_cpm.cp_cpcr & CPM_CR_FLG); /* * Mask all Events in SCCM - we use polling mode */ immr->im_cpm.cp_scc[SCC_ENET].scc_sccm = 0; /* * Clear Events in SCCE -- Clear bits by writing 1's */ immr->im_cpm.cp_scc[SCC_ENET].scc_scce = ~(0x0); /* * Initialize GSMR High 32-Bits * Settings: Normal Mode */ immr->im_cpm.cp_scc[SCC_ENET].scc_gsmrh = 0; /* * Initialize GSMR Low 32-Bits, but do not Enable Transmit/Receive * Settings: * TCI = Invert * TPL = 48 bits * TPP = Repeating 10's * MODE = Ethernet */ immr->im_cpm.cp_scc[SCC_ENET].scc_gsmrl = (SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 | SCC_GSMRL_MODE_ENET); /* * Initialize the DSR -- see section 13.14.4 (pg. 513) v0.4 */ immr->im_cpm.cp_scc[SCC_ENET].scc_dsr = 0xd555; /* * Initialize the PSMR * Settings: * CRC = 32-Bit CCITT * NIB = Begin searching for SFD 22 bits after RENA * FDE = Full Duplex Enable * LPB = Loopback Enable (Needed when FDE is set) * BRO = Reject broadcast packets * PROMISCOUS = Catch all packets regardless of dest. MAC adress */ immr->im_cpm.cp_scc[SCC_ENET].scc_psmr = SCC_PSMR_ENCRC | SCC_PSMR_NIB22 | #if defined(CONFIG_SCC_ENET_FULL_DUPLEX) SCC_PSMR_FDE | SCC_PSMR_LPB | #endif #if defined(CONFIG_SCC_ENET_NO_BROADCAST) SCC_PSMR_BRO | #endif #if defined(CONFIG_SCC_ENET_PROMISCOUS) SCC_PSMR_PRO | #endif 0; /* * Configure Ethernet TENA Signal */ #if (defined(PC_ENET_TENA) && !defined(PB_ENET_TENA)) immr->im_ioport.iop_pcpar |= PC_ENET_TENA; immr->im_ioport.iop_pcdir &= ~PC_ENET_TENA; #elif (defined(PB_ENET_TENA) && !defined(PC_ENET_TENA)) immr->im_cpm.cp_pbpar |= PB_ENET_TENA; immr->im_cpm.cp_pbdir |= PB_ENET_TENA; #else #error Configuration Error: exactly ONE of PB_ENET_TENA, PC_ENET_TENA must be defined #endif /* * Set the ENT/ENR bits in the GSMR Low -- Enable Transmit/Receive */ immr->im_cpm.cp_scc[SCC_ENET].scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT); return 1; } static void scc_halt (struct eth_device *dev) { volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR; immr->im_cpm.cp_scc[SCC_ENET].scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT); immr->im_ioport.iop_pcso &= ~(PC_ENET_CLSN | PC_ENET_RENA); } #if 0 void restart (void) { volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR; immr->im_cpm.cp_scc[SCC_ENET].scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT); } #endif #endif