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/*
* File: scc.c
* Description:
* Basic ET HW initialization and packet RX/TX routines
*
* NOTE <<<IMPORTANT: PLEASE READ>>>:
* 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 <common.h>
#include <malloc.h>
#include <commproc.h>
#include <net.h>
#include <command.h>
#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);
sprintf(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)) {
udelay (1); /* will also trigger Wd if needed */
j++;
}
if (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)) {
udelay (1); /* will also trigger Wd if needed */
j++;
}
if (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. */
NetReceive (NetRxPackets[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) NetRxPackets[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_dev()->enetaddr
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