diff options
Diffstat (limited to 'board/keymile/mgcoge/mgcoge_hdlc_enet.c')
| -rw-r--r-- | board/keymile/mgcoge/mgcoge_hdlc_enet.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/board/keymile/mgcoge/mgcoge_hdlc_enet.c b/board/keymile/mgcoge/mgcoge_hdlc_enet.c new file mode 100644 index 0000000..34f04f5 --- /dev/null +++ b/board/keymile/mgcoge/mgcoge_hdlc_enet.c @@ -0,0 +1,276 @@ +/* + * (C) Copyright 2008 + * Gary Jennejohn, DENX Software Engineering GmbH, garyj@denx.de. + * + * Based in part on cpu/mpc8260/ether_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> +#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 SCC1 */ +#define CPM_CR_SCC_PAGE CPM_CR_SCC1_PAGE +#define CPM_CR_SCC_SBLOCK CPM_CR_SCC1_SBLOCK +#define CMXSCR_MASK (CMXSCR_GR1|CMXSCR_SC1|\ + CMXSCR_RS1CS_MSK|CMXSCR_TS1CS_MSK) +#define CMXSCR_VALUE (CMXSCR_RS1CS_CLK11|CMXSCR_TS1CS_CLK11) +#define MGC_PROFF_HDLC PROFF_SCC1 +#define MGC_SCC_HDLC 0 /* Index, not number! */ + +int keymile_hdlc_enet_init(struct eth_device *dev, bd_t *bis) +{ + /* int i; */ + uint dpr; + /* volatile cbd_t *bdp; */ + volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR; + volatile cpm8260_t *cp = &(im->im_cpm); + volatile scc_t *sccp; + volatile scc_hdlc_t *hpr; + volatile iop8260_t *iop; + + if (already_inited) + return 0; + + hpr = (scc_hdlc_t *)(&im->im_dprambase[MGC_PROFF_HDLC]); + sccp = (scc_t *)(&im->im_scc[MGC_SCC_HDLC]); + iop = &im->im_ioport; + + /* + * Disable receive and transmit just in case. + */ + sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT); + + /* + * Avoid exhausting DPRAM, which would cause a panic. + */ + if (rtx == NULL) { + /* dpr is an offset into dpram */ + dpr = m8260_cpm_dpalloc(sizeof(RTXBD), 8); + rtx = (RTXBD *)&im->im_dprambase[dpr]; + } + + /* 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 pd30, pd31 pins for TXD1, RXD1 respectively */ + iop->iop_ppard |= (0x80000000 >> 30) | (0x80000000 >> 31); + iop->iop_pdird |= (0x80000000 >> 30); + iop->iop_psord |= (0x80000000 >> 30); + + /* use pc21 as CLK11 */ + iop->iop_pparc |= (0x80000000 >> 21); + iop->iop_pdirc &= ~(0x80000000 >> 21); + iop->iop_psorc &= ~(0x80000000 >> 21); + + /* use pc15 as CTS1 */ + iop->iop_pparc |= (0x80000000 >> 15); + iop->iop_pdirc &= ~(0x80000000 >> 15); + iop->iop_psorc &= ~(0x80000000 >> 15); + + /* + * SI clock routing + * use CLK11 + * this also connects SCC1 to NMSI + */ + im->im_cpmux.cmx_scr = (im->im_cpmux.cmx_scr & ~CMXSCR_MASK) | + CMXSCR_VALUE; + + /* keymile_rxIdx = 0; */ + + /* + * Initialize function code registers for big-endian. + */ + hpr->sh_genscc.scc_rfcr = CPMFCR_EB; + hpr->sh_genscc.scc_tfcr = CPMFCR_EB; + + /* + * Set maximum bytes per receive buffer. + */ + hpr->sh_genscc.scc_mrblr = MAX_FRAME_LENGTH; + + /* Setup CRC generator values for HDLC */ + hpr->sh_cmask = 0x0000F0B8; + hpr->sh_cpres = 0x0000FFFF; + + /* Initialize all error counters to 0 */ + hpr->sh_disfc = 0; + hpr->sh_crcec = 0; + hpr->sh_abtsc = 0; + hpr->sh_nmarc = 0; + hpr->sh_retrc = 0; + + /* Set maximum frame length size */ + hpr->sh_mflr = MAX_FRAME_LENGTH; + + /* set to 1 for per frame processing change later if needed */ + hpr->sh_rfthr = 1; + + hpr->sh_hmask = 0xff; + + hpr->sh_haddr2 = SET_HDLC_UUA(keymile_slot); + hpr->sh_haddr3 = hpr->sh_haddr2; + hpr->sh_haddr4 = hpr->sh_haddr2; + /* broadcast */ + hpr->sh_haddr1 = HDLC_BCAST; + + hpr->sh_genscc.scc_rbase = (unsigned int) &rtx->rxbd[0]; + hpr->sh_genscc.scc_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(CPM_CR_SCC_PAGE, CPM_CR_SCC_SBLOCK, + 0, 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, + MGC_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_scc[MGC_SCC_HDLC].scc_gsmrl &= + ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT); +#endif +} + +#endif /* CONFIG_MGCOGE_HDLC_ENET */ |