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/*
* (C) Copyright 2008
* Gary Jennejohn, DENX Software Engineering GmbH, garyj@denx.de.
*
* Based in part on arch/powerpc/cpu/mpc8xx/scc.c.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h> /* commproc.h is included here */
#include <malloc.h>
#include <net.h>
#ifdef CONFIG_KEYMILE_HDLC_ENET
#include "../common/keymile_hdlc_enet.h"
char keymile_slot; /* our slot number in the backplane */
/*
* Since, except during initialization, ethact is always HDLC ETHERNET
* while we're in the driver, just use serial_printf() everywhere for
* output. This avoids possible conflicts when netconsole is being
* used.
*/
#define dprintf(fmt, args...) serial_printf(fmt, ##args)
static int already_inited;
/*
* 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 txbd; /* Tx BD */
cbd_t rxbd[HDLC_PKTBUFSRX]; /* Rx BD */
} RTXBD;
static RTXBD *rtx;
int keymile_hdlc_enet_init(struct eth_device *, bd_t *);
void keymile_hdlc_enet_halt(struct eth_device *);
extern void keymile_hdlc_enet_init_bds(RTXBD *);
extern void initCachedNumbers(int);
/* Use SCC4 */
#define MGS_CPM_CR_HDLC CPM_CR_CH_SCC4
#define MGS_PROFF_HDLC PROFF_SCC4
#define MGS_SCC_HDLC 3 /* Index, not number! */
int keymile_hdlc_enet_init(struct eth_device *dev, bd_t *bis)
{
/* int i; */
/* volatile cbd_t *bdp; */
volatile cpm8xx_t *cp;
volatile scc_t *sccp;
volatile hdlc_pram_t *hpr;
volatile iop8xx_t *iop;
if (already_inited)
return 0;
cp = (cpm8xx_t *)&(((volatile immap_t *)CONFIG_SYS_IMMR)->im_cpm);
hpr = (hdlc_pram_t *)(&cp->cp_dparam[MGS_PROFF_HDLC]);
sccp = (volatile scc_t *)(&cp->cp_scc[MGS_SCC_HDLC]);
iop = (iop8xx_t *)&(((volatile immap_t *)CONFIG_SYS_IMMR)->im_ioport);
/*
* Disable receive and transmit just in case.
*/
sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
#ifndef CONFIG_SYS_ALLOC_DPRAM
#error "CONFIG_SYS_ALLOC_DPRAM must be defined"
#else
/*
* Avoid exhausting DPRAM, which would cause a panic.
* Actually this isn't really necessary, but leave it here
* for safety's sake.
*/
if (rtx == NULL) {
rtx = (RTXBD *) (cp->cp_dpmem +
dpram_alloc_align(sizeof(RTXBD), 8));
if (rtx == (RTXBD *)CPM_DP_NOSPACE)
return -1;
memset((void *)rtx, 0, sizeof(RTXBD));
}
#endif /* !CONFIG_SYS_ALLOC_DPRAM */
/* We need the slot number for addressing. */
keymile_slot = *(char *)(CONFIG_SYS_SLOT_ID_BASE +
CONFIG_SYS_SLOT_ID_OFF) & CONFIG_SYS_SLOT_ID_MASK;
/*
* Be consistent with the Linux driver and set
* only enetaddr[0].
*
* Always add 1 to the slot number so that
* there are no problems with an ethaddr which
* is all 0s. This should be acceptable because
* a board should never have a slot number of 255,
* which is the broadcast address. The HDLC addressing
* uses only the slot number.
*/
dev->enetaddr[0] = keymile_slot + 1;
#ifdef TEST_IT
dprintf("slot %d\n", keymile_slot);
#endif
/* use pa8, pa9 pins for TXD4, RXD4 respectively */
iop->iop_papar |= ((0x8000 >> 8) | (0x8000 >> 9));
iop->iop_padir &= ~((0x8000 >> 8) | (0x8000 >> 9));
iop->iop_paodr &= ~((0x8000 >> 8) | (0x8000 >> 9));
/* also use pa0 as CLK8 */
iop->iop_papar |= 0x8000;
iop->iop_padir &= ~0x8000;
iop->iop_paodr &= ~0x8000;
/* use pc5 as CTS4 */
iop->iop_pcpar &= ~(0x8000 >> 5);
iop->iop_pcdir &= ~(0x8000 >> 5);
iop->iop_pcso |= (0x8000 >> 5);
/*
* SI clock routing
* use CLK8
* this also connects SCC4 to NMSI
*/
cp->cp_sicr = (cp->cp_sicr & ~0xff000000) | 0x3f000000;
/* keymile_rxIdx = 0; */
/*
* Initialize function code registers for big-endian.
*/
hpr->rfcr = SCC_EB;
hpr->tfcr = SCC_EB;
/*
* Set maximum bytes per receive buffer.
*/
hpr->mrblr = MAX_FRAME_LENGTH;
/* Setup CRC generator values for HDLC */
hpr->c_mask = 0x0000F0B8;
hpr->c_pres = 0x0000FFFF;
/* Initialize all error counters to 0 */
hpr->disfc = 0;
hpr->crcec = 0;
hpr->abtsc = 0;
hpr->nmarc = 0;
hpr->retrc = 0;
/* Set maximum frame length size */
hpr->mflr = MAX_FRAME_LENGTH;
/* set to 1 for per frame processing change later if needed */
hpr->rfthr = 1;
hpr->hmask = 0xff;
hpr->haddr2 = SET_HDLC_UUA(keymile_slot);
hpr->haddr3 = hpr->haddr2;
hpr->haddr4 = hpr->haddr2;
/* broadcast */
hpr->haddr1 = HDLC_BCAST;
hpr->rbase = (unsigned int) &rtx->rxbd[0];
hpr->tbase = (unsigned int) &rtx->txbd;
#if 0
/*
* Initialize the buffer descriptors.
*/
bdp = &rtx->txbd;
bdp->cbd_sc = 0;
bdp->cbd_bufaddr = 0;
bdp->cbd_sc = BD_SC_WRAP;
/*
* Setup RX packet buffers, aligned correctly.
* Borrowed from net/net.c.
*/
MyRxPackets[0] = &MyPktBuf[0] + (PKTALIGN - 1);
MyRxPackets[0] -= (ulong)MyRxPackets[0] % PKTALIGN;
for (i = 1; i < HDLC_PKTBUFSRX; i++)
MyRxPackets[i] = MyRxPackets[0] + i * PKT_MAXBLR_SIZE;
bdp = &rtx->rxbd[0];
for (i = 0; i < HDLC_PKTBUFSRX; i++) {
bdp->cbd_sc = BD_SC_EMPTY;
/* Leave space at the start for INET header. */
bdp->cbd_bufaddr = (unsigned int)(MyRxPackets[i] +
INET_HDR_ALIGN);
bdp++;
}
bdp--;
bdp->cbd_sc |= BD_SC_WRAP;
#else
keymile_hdlc_enet_init_bds(rtx);
#endif
/* Let's re-initialize the channel now. We have to do it later
* than the manual describes because we have just now finished
* the BD initialization.
*/
cp->cp_cpcr = mk_cr_cmd(MGS_CPM_CR_HDLC, CPM_CR_INIT_TRX) | CPM_CR_FLG;
while (cp->cp_cpcr & CPM_CR_FLG);
sccp->scc_gsmrl = SCC_GSMRL_MODE_HDLC;
/* CTSS=1 */
sccp->scc_gsmrh = SCC_GSMRH_CTSS;
/* NOF=0, RTE=1, DRT=0, BUS=1 */
sccp->scc_psmr = ((0x8000 >> 6) | (0x8000 >> 10));
/* loopback for local testing */
#ifdef GJTEST
dprintf("LOOPBACK!\n");
sccp->scc_gsmrl |= SCC_GSMRL_DIAG_LOOP;
#endif
/*
* Disable all interrupts and clear all pending
* events.
*/
sccp->scc_sccm = 0;
sccp->scc_scce = 0xffff;
/*
* And last, enable the transmit and receive processing.
*/
sccp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
dprintf("%s: HDLC ENET Version 0.3 on SCC%d\n", dev->name,
MGS_SCC_HDLC + 1);
/*
* We may not get an ARP packet because ARP was already done on
* a different interface, so initialize the cached values now.
*/
initCachedNumbers(1);
already_inited = 1;
return 0;
}
void keymile_hdlc_enet_halt(struct eth_device *dev)
{
#if 0 /* just return, but keep this for reference */
volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
/* maybe should do a graceful stop here? */
immr->im_cpm.cp_scc[MGS_SCC_HDLC].scc_gsmrl &=
~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
#endif
}
#endif /* CONFIG_KEYMILE_HDLC_ENET */
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