[U-Boot] [PATCH] mgsuvd add the board-specific part of the HDLC driver
Gary Jennejohn
garyj at denx.de
Sun Nov 9 12:50:59 CET 2008
Signed-off-by: Gary Jennejohn <garyj at denx.de>
---
board/keymile/mgsuvd/Makefile | 3 +-
board/keymile/mgsuvd/mgsuvd_hdlc_enet.c | 278 +++++++++++++++++++++++++++++++
2 files changed, 280 insertions(+), 1 deletions(-)
create mode 100644 board/keymile/mgsuvd/mgsuvd_hdlc_enet.c
diff --git a/board/keymile/mgsuvd/Makefile b/board/keymile/mgsuvd/Makefile
index b2145f9..2c5732d 100644
--- a/board/keymile/mgsuvd/Makefile
+++ b/board/keymile/mgsuvd/Makefile
@@ -28,7 +28,8 @@ endif
LIB = $(obj)lib$(BOARD).a
-COBJS = $(BOARD).o ../common/common.o
+COBJS = $(BOARD).o ../common/common.o ../common/keymile_hdlc_enet.o \
+ mgsuvd_hdlc_enet.o
SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS))
diff --git a/board/keymile/mgsuvd/mgsuvd_hdlc_enet.c b/board/keymile/mgsuvd/mgsuvd_hdlc_enet.c
new file mode 100644
index 0000000..9b93131
--- /dev/null
+++ b/board/keymile/mgsuvd/mgsuvd_hdlc_enet.c
@@ -0,0 +1,278 @@
+/*
+ * (C) Copyright 2008
+ * Gary Jennejohn, DENX Software Engineering GmbH, garyj at denx.de.
+ *
+ * Based in part on 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 */
--
1.5.4.3
---
Gary Jennejohn
*********************************************************************
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 Email: office at denx.de
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