aboutsummaryrefslogtreecommitdiff
path: root/arch/nios2
diff options
context:
space:
mode:
authorPeter Tyser <ptyser@xes-inc.com>2010-04-12 22:28:20 -0500
committerWolfgang Denk <wd@denx.de>2010-04-13 09:13:27 +0200
commit37e4dafaae96ccc970a896f90186fadcf858aad0 (patch)
treefd5e97451c1072f4939dcbc000df12f34c92d2cb /arch/nios2
parent6a8a2b7058a398fe207021259cb2c529fb225eff (diff)
downloadu-boot-linaro-stable-37e4dafaae96ccc970a896f90186fadcf858aad0.tar.gz
nios2: Move cpu/nios2/* to arch/nios2/cpu/*
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Diffstat (limited to 'arch/nios2')
-rw-r--r--arch/nios2/cpu/Makefile48
-rw-r--r--arch/nios2/cpu/config.mk24
-rw-r--r--arch/nios2/cpu/cpu.c50
-rw-r--r--arch/nios2/cpu/epcs.c733
-rw-r--r--arch/nios2/cpu/exceptions.S155
-rw-r--r--arch/nios2/cpu/interrupts.c265
-rw-r--r--arch/nios2/cpu/start.S217
-rw-r--r--arch/nios2/cpu/sysid.c58
-rw-r--r--arch/nios2/cpu/traps.c42
9 files changed, 1592 insertions, 0 deletions
diff --git a/arch/nios2/cpu/Makefile b/arch/nios2/cpu/Makefile
new file mode 100644
index 000000000..3dfaa833c
--- /dev/null
+++ b/arch/nios2/cpu/Makefile
@@ -0,0 +1,48 @@
+#
+# (C) Copyright 2000-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# 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 $(TOPDIR)/config.mk
+
+LIB = $(obj)lib$(CPU).a
+
+START = start.o
+SOBJS = exceptions.o
+COBJS = cpu.o interrupts.o sysid.o traps.o epcs.o
+
+SRCS := $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS))
+START := $(addprefix $(obj),$(START))
+
+all: $(obj).depend $(START) $(LIB)
+
+$(LIB): $(OBJS)
+ $(AR) $(ARFLAGS) $@ $(OBJS)
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/arch/nios2/cpu/config.mk b/arch/nios2/cpu/config.mk
new file mode 100644
index 000000000..f228d7219
--- /dev/null
+++ b/arch/nios2/cpu/config.mk
@@ -0,0 +1,24 @@
+#
+# (C) Copyright 2000
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# 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
+#
+
+PLATFORM_RELFLAGS +=
diff --git a/arch/nios2/cpu/cpu.c b/arch/nios2/cpu/cpu.c
new file mode 100644
index 000000000..6379534a0
--- /dev/null
+++ b/arch/nios2/cpu/cpu.c
@@ -0,0 +1,50 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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 <nios2.h>
+#include <nios2-io.h>
+
+#if defined (CONFIG_SYS_NIOS_SYSID_BASE)
+extern void display_sysid (void);
+#endif /* CONFIG_SYS_NIOS_SYSID_BASE */
+
+int checkcpu (void)
+{
+ printf ("CPU : Nios-II\n");
+#if !defined(CONFIG_SYS_NIOS_SYSID_BASE)
+ printf ("SYSID : <unknown>\n");
+#else
+ display_sysid ();
+#endif
+ return (0);
+}
+
+
+int do_reset (void)
+{
+ void (*rst)(void) = (void(*)(void))CONFIG_SYS_RESET_ADDR;
+ disable_interrupts ();
+ rst();
+ return(0);
+}
diff --git a/arch/nios2/cpu/epcs.c b/arch/nios2/cpu/epcs.c
new file mode 100644
index 000000000..ab7d746b5
--- /dev/null
+++ b/arch/nios2/cpu/epcs.c
@@ -0,0 +1,733 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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>
+
+#if defined(CONFIG_SYS_NIOS_EPCSBASE)
+#include <command.h>
+#include <asm/io.h>
+#include <nios2-io.h>
+#include <nios2-epcs.h>
+
+
+/*-----------------------------------------------------------------------*/
+#define SHORT_HELP\
+ "epcs - read/write Cyclone EPCS configuration device.\n"
+
+#define LONG_HELP\
+ "\n"\
+ "epcs erase start [end]\n"\
+ " - erase sector start or sectors start through end.\n"\
+ "epcs info\n"\
+ " - display EPCS device information.\n"\
+ "epcs protect on | off\n"\
+ " - turn device protection on or off.\n"\
+ "epcs read addr offset count\n"\
+ " - read count bytes from offset to addr.\n"\
+ "epcs write addr offset count\n"\
+ " - write count bytes to offset from addr.\n"\
+ "epcs verify addr offset count\n"\
+ " - verify count bytes at offset from addr."
+
+
+/*-----------------------------------------------------------------------*/
+/* Operation codes for serial configuration devices
+ */
+#define EPCS_WRITE_ENA 0x06 /* Write enable */
+#define EPCS_WRITE_DIS 0x04 /* Write disable */
+#define EPCS_READ_STAT 0x05 /* Read status */
+#define EPCS_READ_BYTES 0x03 /* Read bytes */
+#define EPCS_READ_ID 0xab /* Read silicon id */
+#define EPCS_WRITE_STAT 0x01 /* Write status */
+#define EPCS_WRITE_BYTES 0x02 /* Write bytes */
+#define EPCS_ERASE_BULK 0xc7 /* Erase entire device */
+#define EPCS_ERASE_SECT 0xd8 /* Erase sector */
+
+/* Device status register bits
+ */
+#define EPCS_STATUS_WIP (1<<0) /* Write in progress */
+#define EPCS_STATUS_WEL (1<<1) /* Write enable latch */
+
+/* Misc
+ */
+#define EPCS_TIMEOUT 100 /* 100 msec timeout */
+
+static nios_spi_t *epcs = (nios_spi_t *)CONFIG_SYS_NIOS_EPCSBASE;
+
+/***********************************************************************
+ * Device access
+ ***********************************************************************/
+static int epcs_cs (int assert)
+{
+ ulong start;
+ unsigned tmp;
+
+
+ if (assert) {
+ tmp = readl (&epcs->control);
+ writel (tmp | NIOS_SPI_SSO, &epcs->control);
+ } else {
+ /* Let all bits shift out */
+ start = get_timer (0);
+ while ((readl (&epcs->status) & NIOS_SPI_TMT) == 0)
+ if (get_timer (start) > EPCS_TIMEOUT)
+ return (-1);
+ tmp = readl (&epcs->control);
+ writel (tmp & ~NIOS_SPI_SSO, &epcs->control);
+ }
+ return (0);
+}
+
+static int epcs_tx (unsigned char c)
+{
+ ulong start;
+
+ start = get_timer (0);
+ while ((readl (&epcs->status) & NIOS_SPI_TRDY) == 0)
+ if (get_timer (start) > EPCS_TIMEOUT)
+ return (-1);
+ writel (c, &epcs->txdata);
+ return (0);
+}
+
+static int epcs_rx (void)
+{
+ ulong start;
+
+ start = get_timer (0);
+ while ((readl (&epcs->status) & NIOS_SPI_RRDY) == 0)
+ if (get_timer (start) > EPCS_TIMEOUT)
+ return (-1);
+ return (readl (&epcs->rxdata));
+}
+
+static unsigned char bitrev[] = {
+ 0x00, 0x08, 0x04, 0x0c, 0x02, 0x0a, 0x06, 0x0e,
+ 0x01, 0x09, 0x05, 0x0d, 0x03, 0x0b, 0x07, 0x0f
+};
+
+static unsigned char epcs_bitrev (unsigned char c)
+{
+ unsigned char val;
+
+ val = bitrev[c>>4];
+ val |= bitrev[c & 0x0f]<<4;
+ return (val);
+}
+
+static void epcs_rcv (unsigned char *dst, int len)
+{
+ while (len--) {
+ epcs_tx (0);
+ *dst++ = epcs_rx ();
+ }
+}
+
+static void epcs_rrcv (unsigned char *dst, int len)
+{
+ while (len--) {
+ epcs_tx (0);
+ *dst++ = epcs_bitrev (epcs_rx ());
+ }
+}
+
+static void epcs_snd (unsigned char *src, int len)
+{
+ while (len--) {
+ epcs_tx (*src++);
+ epcs_rx ();
+ }
+}
+
+static void epcs_rsnd (unsigned char *src, int len)
+{
+ while (len--) {
+ epcs_tx (epcs_bitrev (*src++));
+ epcs_rx ();
+ }
+}
+
+static void epcs_wr_enable (void)
+{
+ epcs_cs (1);
+ epcs_tx (EPCS_WRITE_ENA);
+ epcs_rx ();
+ epcs_cs (0);
+}
+
+static unsigned char epcs_status_rd (void)
+{
+ unsigned char status;
+
+ epcs_cs (1);
+ epcs_tx (EPCS_READ_STAT);
+ epcs_rx ();
+ epcs_tx (0);
+ status = epcs_rx ();
+ epcs_cs (0);
+ return (status);
+}
+
+static void epcs_status_wr (unsigned char status)
+{
+ epcs_wr_enable ();
+ epcs_cs (1);
+ epcs_tx (EPCS_WRITE_STAT);
+ epcs_rx ();
+ epcs_tx (status);
+ epcs_rx ();
+ epcs_cs (0);
+ return;
+}
+
+/***********************************************************************
+ * Device information
+ ***********************************************************************/
+
+static struct epcs_devinfo_t devinfo[] = {
+ { "EPCS1 ", 0x10, 17, 4, 15, 8, 0x0c },
+ { "EPCS4 ", 0x12, 19, 8, 16, 8, 0x1c },
+ { "EPCS16", 0x14, 21, 32, 16, 8, 0x1c },
+ { "EPCS64", 0x16, 23,128, 16, 8, 0x1c },
+ { 0, 0, 0, 0, 0, 0 }
+};
+
+int epcs_reset (void)
+{
+ /* When booting from an epcs controller, the epcs bootrom
+ * code may leave the slave select in an asserted state.
+ * This causes two problems: (1) The initial epcs access
+ * will fail -- not a big deal, and (2) a software reset
+ * will cause the bootrom code to hang since it does not
+ * ensure the select is negated prior to first access -- a
+ * big deal. Here we just negate chip select and everything
+ * gets better :-)
+ */
+ epcs_cs (0); /* Negate chip select */
+ return (0);
+}
+
+epcs_devinfo_t *epcs_dev_find (void)
+{
+ unsigned char buf[4];
+ unsigned char id;
+ int i;
+ struct epcs_devinfo_t *dev = NULL;
+
+ /* Read silicon id requires 3 "dummy bytes" before it's put
+ * on the wire.
+ */
+ buf[0] = EPCS_READ_ID;
+ buf[1] = 0;
+ buf[2] = 0;
+ buf[3] = 0;
+
+ epcs_cs (1);
+ epcs_snd (buf,4);
+ epcs_rcv (buf,1);
+ if (epcs_cs (0) == -1)
+ return (NULL);
+ id = buf[0];
+
+ /* Find the info struct */
+ i = 0;
+ while (devinfo[i].name) {
+ if (id == devinfo[i].id) {
+ dev = &devinfo[i];
+ break;
+ }
+ i++;
+ }
+
+ return (dev);
+}
+
+/***********************************************************************
+ * Misc Utilities
+ ***********************************************************************/
+int epcs_cfgsz (void)
+{
+ int sz = 0;
+ unsigned char buf[128];
+ unsigned char *p;
+ struct epcs_devinfo_t *dev = epcs_dev_find ();
+
+ if (!dev)
+ return (-1);
+
+ /* Read in the first 128 bytes of the device */
+ buf[0] = EPCS_READ_BYTES;
+ buf[1] = 0;
+ buf[2] = 0;
+ buf[3] = 0;
+
+ epcs_cs (1);
+ epcs_snd (buf,4);
+ epcs_rrcv (buf, sizeof(buf));
+ epcs_cs (0);
+
+ /* Search for the starting 0x6a which is followed by the
+ * 4-byte 'register' and 4-byte bit-count.
+ */
+ p = buf;
+ while (p < buf + sizeof(buf)-8) {
+ if ( *p == 0x6a ) {
+ /* Point to bit count and extract */
+ p += 5;
+ sz = *p++;
+ sz |= *p++ << 8;
+ sz |= *p++ << 16;
+ sz |= *p++ << 24;
+ /* Convert to byte count */
+ sz += 7;
+ sz >>= 3;
+ } else if (*p == 0xff) {
+ /* 0xff is ok ... just skip */
+ p++;
+ continue;
+ } else {
+ /* Not 0xff or 0x6a ... something's not
+ * right ... report 'unknown' (sz=0).
+ */
+ break;
+ }
+ }
+ return (sz);
+}
+
+int epcs_erase (unsigned start, unsigned end)
+{
+ unsigned off, sectsz;
+ unsigned char buf[4];
+ struct epcs_devinfo_t *dev = epcs_dev_find ();
+
+ if (!dev || (start>end))
+ return (-1);
+
+ /* Erase the requested sectors. An address is required
+ * that lies within the requested sector -- we'll just
+ * use the first address in the sector.
+ */
+ printf ("epcs erasing sector %d ", start);
+ if (start != end)
+ printf ("to %d ", end);
+ sectsz = (1 << dev->sz_sect);
+ while (start <= end) {
+ off = start * sectsz;
+ start++;
+
+ buf[0] = EPCS_ERASE_SECT;
+ buf[1] = off >> 16;
+ buf[2] = off >> 8;
+ buf[3] = off;
+
+ epcs_wr_enable ();
+ epcs_cs (1);
+ epcs_snd (buf,4);
+ epcs_cs (0);
+
+ printf ("."); /* Some user feedback */
+
+ /* Wait for erase to complete */
+ while (epcs_status_rd() & EPCS_STATUS_WIP)
+ ;
+ }
+ printf (" done.\n");
+ return (0);
+}
+
+int epcs_read (ulong addr, ulong off, ulong cnt)
+{
+ unsigned char buf[4];
+ struct epcs_devinfo_t *dev = epcs_dev_find ();
+
+ if (!dev)
+ return (-1);
+
+ buf[0] = EPCS_READ_BYTES;
+ buf[1] = off >> 16;
+ buf[2] = off >> 8;
+ buf[3] = off;
+
+ epcs_cs (1);
+ epcs_snd (buf,4);
+ epcs_rrcv ((unsigned char *)addr, cnt);
+ epcs_cs (0);
+
+ return (0);
+}
+
+int epcs_write (ulong addr, ulong off, ulong cnt)
+{
+ ulong wrcnt;
+ unsigned pgsz;
+ unsigned char buf[4];
+ struct epcs_devinfo_t *dev = epcs_dev_find ();
+
+ if (!dev)
+ return (-1);
+
+ pgsz = (1<<dev->sz_page);
+ while (cnt) {
+ if (off % pgsz)
+ wrcnt = pgsz - (off % pgsz);
+ else
+ wrcnt = pgsz;
+ wrcnt = (wrcnt > cnt) ? cnt : wrcnt;
+
+ buf[0] = EPCS_WRITE_BYTES;
+ buf[1] = off >> 16;
+ buf[2] = off >> 8;
+ buf[3] = off;
+
+ epcs_wr_enable ();
+ epcs_cs (1);
+ epcs_snd (buf,4);
+ epcs_rsnd ((unsigned char *)addr, wrcnt);
+ epcs_cs (0);
+
+ /* Wait for write to complete */
+ while (epcs_status_rd() & EPCS_STATUS_WIP)
+ ;
+
+ cnt -= wrcnt;
+ off += wrcnt;
+ addr += wrcnt;
+ }
+
+ return (0);
+}
+
+int epcs_verify (ulong addr, ulong off, ulong cnt, ulong *err)
+{
+ ulong rdcnt;
+ unsigned char buf[256];
+ unsigned char *start,*end;
+ int i;
+
+ start = end = (unsigned char *)addr;
+ while (cnt) {
+ rdcnt = (cnt>sizeof(buf)) ? sizeof(buf) : cnt;
+ epcs_read ((ulong)buf, off, rdcnt);
+ for (i=0; i<rdcnt; i++) {
+ if (*end != buf[i]) {
+ *err = end - start;
+ return(-1);
+ }
+ end++;
+ }
+ cnt -= rdcnt;
+ off += rdcnt;
+ }
+ return (0);
+}
+
+static int epcs_sect_erased (int sect, unsigned *offset,
+ struct epcs_devinfo_t *dev)
+{
+ unsigned char buf[128];
+ unsigned off, end;
+ unsigned sectsz;
+ int i;
+
+ sectsz = (1 << dev->sz_sect);
+ off = sectsz * sect;
+ end = off + sectsz;
+
+ while (off < end) {
+ epcs_read ((ulong)buf, off, sizeof(buf));
+ for (i=0; i < sizeof(buf); i++) {
+ if (buf[i] != 0xff) {
+ *offset = off + i;
+ return (0);
+ }
+ }
+ off += sizeof(buf);
+ }
+ return (1);
+}
+
+
+/***********************************************************************
+ * Commands
+ ***********************************************************************/
+static
+void do_epcs_info (struct epcs_devinfo_t *dev, int argc, char *argv[])
+{
+ int i;
+ unsigned char stat;
+ unsigned tmp;
+ int erased;
+
+ /* Basic device info */
+ printf ("%s: %d kbytes (%d sectors x %d kbytes,"
+ " %d bytes/page)\n",
+ dev->name, 1 << (dev->size-10),
+ dev->num_sects, 1 << (dev->sz_sect-10),
+ 1 << dev->sz_page );
+
+ /* Status -- for now protection is all-or-nothing */
+ stat = epcs_status_rd();
+ printf ("status: 0x%02x (WIP:%d, WEL:%d, PROT:%s)\n",
+ stat,
+ (stat & EPCS_STATUS_WIP) ? 1 : 0,
+ (stat & EPCS_STATUS_WEL) ? 1 : 0,
+ (stat & dev->prot_mask) ? "on" : "off" );
+
+ /* Configuration */
+ tmp = epcs_cfgsz ();
+ if (tmp) {
+ printf ("config: 0x%06x (%d) bytes\n", tmp, tmp );
+ } else {
+ printf ("config: unknown\n" );
+ }
+
+ /* Sector info */
+ for (i=0; (i < dev->num_sects) && (argc > 1); i++) {
+ erased = epcs_sect_erased (i, &tmp, dev);
+ if ((i & 0x03) == 0) printf ("\n");
+ printf ("%4d: %07x ",
+ i, i*(1<<dev->sz_sect) );
+ if (erased)
+ printf ("E ");
+ else
+ printf (" ");
+ }
+ printf ("\n");
+
+ return;
+}
+
+static
+void do_epcs_erase (struct epcs_devinfo_t *dev, int argc, char *argv[])
+{
+ unsigned start,end;
+
+ if ((argc < 3) || (argc > 4)) {
+ printf ("USAGE: epcs erase sect [end]\n");
+ return;
+ }
+ if ((epcs_status_rd() & dev->prot_mask) != 0) {
+ printf ( "epcs: device protected.\n");
+ return;
+ }
+
+ start = simple_strtoul (argv[2], NULL, 10);
+ if (argc > 3)
+ end = simple_strtoul (argv[3], NULL, 10);
+ else
+ end = start;
+ if ((start >= dev->num_sects) || (start > end)) {
+ printf ("epcs: invalid sector range: [%d:%d]\n",
+ start, end );
+ return;
+ }
+
+ epcs_erase (start, end);
+
+ return;
+}
+
+static
+void do_epcs_protect (struct epcs_devinfo_t *dev, int argc, char *argv[])
+{
+ unsigned char stat;
+
+ /* For now protection is all-or-nothing to keep things
+ * simple. The protection bits don't map in a linear
+ * fashion ... and we would rather protect the bottom
+ * of the device since it contains the config data and
+ * leave the top unprotected for app use. But unfortunately
+ * protection works from top-to-bottom so it does
+ * really help very much from a software app point-of-view.
+ */
+ if (argc < 3) {
+ printf ("USAGE: epcs protect on | off\n");
+ return;
+ }
+ if (!dev)
+ return;
+
+ /* Protection on/off is just a matter of setting/clearing
+ * all protection bits in the status register.
+ */
+ stat = epcs_status_rd ();
+ if (strcmp ("on", argv[2]) == 0) {
+ stat |= dev->prot_mask;
+ } else if (strcmp ("off", argv[2]) == 0 ) {
+ stat &= ~dev->prot_mask;
+ } else {
+ printf ("epcs: unknown protection: %s\n", argv[2]);
+ return;
+ }
+ epcs_status_wr (stat);
+ return;
+}
+
+static
+void do_epcs_read (struct epcs_devinfo_t *dev, int argc, char *argv[])
+{
+ ulong addr,off,cnt;
+ ulong sz;
+
+ if (argc < 5) {
+ printf ("USAGE: epcs read addr offset count\n");
+ return;
+ }
+
+ sz = 1 << dev->size;
+ addr = simple_strtoul (argv[2], NULL, 16);
+ off = simple_strtoul (argv[3], NULL, 16);
+ cnt = simple_strtoul (argv[4], NULL, 16);
+ if (off > sz) {
+ printf ("offset is greater than device size"
+ "... aborting.\n");
+ return;
+ }
+ if ((off + cnt) > sz) {
+ printf ("request exceeds device size"
+ "... truncating.\n");
+ cnt = sz - off;
+ }
+ printf ("epcs: read %08lx <- %06lx (0x%lx bytes)\n",
+ addr, off, cnt);
+ epcs_read (addr, off, cnt);
+
+ return;
+}
+
+static
+void do_epcs_write (struct epcs_devinfo_t *dev, int argc, char *argv[])
+{
+ ulong addr,off,cnt;
+ ulong sz;
+ ulong err;
+
+ if (argc < 5) {
+ printf ("USAGE: epcs write addr offset count\n");
+ return;
+ }
+ if ((epcs_status_rd() & dev->prot_mask) != 0) {
+ printf ( "epcs: device protected.\n");
+ return;
+ }
+
+ sz = 1 << dev->size;
+ addr = simple_strtoul (argv[2], NULL, 16);
+ off = simple_strtoul (argv[3], NULL, 16);
+ cnt = simple_strtoul (argv[4], NULL, 16);
+ if (off > sz) {
+ printf ("offset is greater than device size"
+ "... aborting.\n");
+ return;
+ }
+ if ((off + cnt) > sz) {
+ printf ("request exceeds device size"
+ "... truncating.\n");
+ cnt = sz - off;
+ }
+ printf ("epcs: write %08lx -> %06lx (0x%lx bytes)\n",
+ addr, off, cnt);
+ epcs_write (addr, off, cnt);
+ if (epcs_verify (addr, off, cnt, &err) != 0)
+ printf ("epcs: write error at offset %06lx\n", err);
+
+ return;
+}
+
+static
+void do_epcs_verify (struct epcs_devinfo_t *dev, int argc, char *argv[])
+{
+ ulong addr,off,cnt;
+ ulong sz;
+ ulong err;
+
+ if (argc < 5) {
+ printf ("USAGE: epcs verify addr offset count\n");
+ return;
+ }
+
+ sz = 1 << dev->size;
+ addr = simple_strtoul (argv[2], NULL, 16);
+ off = simple_strtoul (argv[3], NULL, 16);
+ cnt = simple_strtoul (argv[4], NULL, 16);
+ if (off > sz) {
+ printf ("offset is greater than device size"
+ "... aborting.\n");
+ return;
+ }
+ if ((off + cnt) > sz) {
+ printf ("request exceeds device size"
+ "... truncating.\n");
+ cnt = sz - off;
+ }
+ printf ("epcs: verify %08lx -> %06lx (0x%lx bytes)\n",
+ addr, off, cnt);
+ if (epcs_verify (addr, off, cnt, &err) != 0)
+ printf ("epcs: verify error at offset %06lx\n", err);
+
+ return;
+}
+
+/*-----------------------------------------------------------------------*/
+int do_epcs (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ int len;
+ struct epcs_devinfo_t *dev = epcs_dev_find ();
+
+ if (!dev) {
+ printf ("epcs: device not found.\n");
+ return (-1);
+ }
+
+ if (argc < 2) {
+ do_epcs_info (dev, argc, argv);
+ return (0);
+ }
+
+ len = strlen (argv[1]);
+ if (strncmp ("info", argv[1], len) == 0) {
+ do_epcs_info (dev, argc, argv);
+ } else if (strncmp ("erase", argv[1], len) == 0) {
+ do_epcs_erase (dev, argc, argv);
+ } else if (strncmp ("protect", argv[1], len) == 0) {
+ do_epcs_protect (dev, argc, argv);
+ } else if (strncmp ("read", argv[1], len) == 0) {
+ do_epcs_read (dev, argc, argv);
+ } else if (strncmp ("write", argv[1], len) == 0) {
+ do_epcs_write (dev, argc, argv);
+ } else if (strncmp ("verify", argv[1], len) == 0) {
+ do_epcs_verify (dev, argc, argv);
+ } else {
+ printf ("epcs: unknown operation: %s\n", argv[1]);
+ }
+
+ return (0);
+}
+
+/*-----------------------------------------------------------------------*/
+
+
+U_BOOT_CMD( epcs, 5, 0, do_epcs, SHORT_HELP, LONG_HELP );
+
+#endif /* CONFIG_NIOS_EPCS */
diff --git a/arch/nios2/cpu/exceptions.S b/arch/nios2/cpu/exceptions.S
new file mode 100644
index 000000000..b9c7a587e
--- /dev/null
+++ b/arch/nios2/cpu/exceptions.S
@@ -0,0 +1,155 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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 <config.h>
+#include <asm/opcodes.h>
+
+
+ .text
+ .align 4
+
+ .global _exception
+
+ .set noat
+ .set nobreak
+
+_exception:
+ /* SAVE ALL REGS -- this allows trap and unimplemented
+ * instruction handlers to be coded conveniently in C
+ */
+ addi sp, sp, -(33*4)
+ stw r0, 0(sp)
+ stw r1, 4(sp)
+ stw r2, 8(sp)
+ stw r3, 12(sp)
+ stw r4, 16(sp)
+ stw r5, 20(sp)
+ stw r6, 24(sp)
+ stw r7, 28(sp)
+ stw r8, 32(sp)
+ stw r9, 36(sp)
+ stw r10, 40(sp)
+ stw r11, 44(sp)
+ stw r12, 48(sp)
+ stw r13, 52(sp)
+ stw r14, 56(sp)
+ stw r15, 60(sp)
+ stw r16, 64(sp)
+ stw r17, 68(sp)
+ stw r19, 72(sp)
+ stw r19, 76(sp)
+ stw r20, 80(sp)
+ stw r21, 84(sp)
+ stw r22, 88(sp)
+ stw r23, 92(sp)
+ stw r24, 96(sp)
+ stw r25, 100(sp)
+ stw r26, 104(sp)
+ stw r27, 108(sp)
+ stw r28, 112(sp)
+ stw r29, 116(sp)
+ stw r30, 120(sp)
+ stw r31, 124(sp)
+ rdctl et, estatus
+ stw et, 128(sp)
+
+ /* If interrupts are disabled -- software interrupt */
+ rdctl et, estatus
+ andi et, et, 1
+ beq et, r0, 0f
+
+ /* If no interrupts are pending -- software interrupt */
+ rdctl et, ipending
+ beq et, r0, 0f
+
+ /* HARDWARE INTERRUPT: Call interrupt handler */
+ movhi r3, %hi(external_interrupt)
+ ori r3, r3, %lo(external_interrupt)
+ mov r4, sp /* ptr to regs */
+ callr r3
+
+ /* Return address fixup: execution resumes by re-issue of
+ * interrupted instruction at ea-4 (ea == r29). Here we do
+ * simple fixup to allow common exception return.
+ */
+ ldw r3, 116(sp)
+ addi r3, r3, -4
+ stw r3, 116(sp)
+ br _exception_return
+
+0:
+ /* TRAP EXCEPTION */
+ movhi r3, %hi(OPC_TRAP)
+ ori r3, r3, %lo(OPC_TRAP)
+ addi r1, ea, -4
+ ldw r1, 0(r1)
+ bne r1, r3, 1f
+ movhi r3, %hi(trap_handler)
+ ori r3, r3, %lo(trap_handler)
+ mov r4, sp /* ptr to regs */
+ callr r3
+ br _exception_return
+
+1:
+ /* UNIMPLEMENTED INSTRUCTION EXCEPTION */
+ movhi r3, %hi(soft_emulation)
+ ori r3, r3, %lo(soft_emulation)
+ mov r4, sp /* ptr to regs */
+ callr r3
+
+ /* Restore regsisters and return from exception*/
+_exception_return:
+ ldw r1, 4(sp)
+ ldw r2, 8(sp)
+ ldw r3, 12(sp)
+ ldw r4, 16(sp)
+ ldw r5, 20(sp)
+ ldw r6, 24(sp)
+ ldw r7, 28(sp)
+ ldw r8, 32(sp)
+ ldw r9, 36(sp)
+ ldw r10, 40(sp)
+ ldw r11, 44(sp)
+ ldw r12, 48(sp)
+ ldw r13, 52(sp)
+ ldw r14, 56(sp)
+ ldw r15, 60(sp)
+ ldw r16, 64(sp)
+ ldw r17, 68(sp)
+ ldw r19, 72(sp)
+ ldw r19, 76(sp)
+ ldw r20, 80(sp)
+ ldw r21, 84(sp)
+ ldw r22, 88(sp)
+ ldw r23, 92(sp)
+ ldw r24, 96(sp)
+ ldw r25, 100(sp)
+ ldw r26, 104(sp)
+ ldw r27, 108(sp)
+ ldw r28, 112(sp)
+ ldw r29, 116(sp)
+ ldw r30, 120(sp)
+ ldw r31, 124(sp)
+ addi sp, sp, (33*4)
+ eret
+/*-------------------------------------------------------------*/
diff --git a/arch/nios2/cpu/interrupts.c b/arch/nios2/cpu/interrupts.c
new file mode 100644
index 000000000..b552db4eb
--- /dev/null
+++ b/arch/nios2/cpu/interrupts.c
@@ -0,0 +1,265 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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 <nios2.h>
+#include <nios2-io.h>
+#include <asm/types.h>
+#include <asm/io.h>
+#include <asm/ptrace.h>
+#include <common.h>
+#include <command.h>
+#include <watchdog.h>
+#ifdef CONFIG_STATUS_LED
+#include <status_led.h>
+#endif
+
+#if defined(CONFIG_SYS_NIOS_TMRBASE) && !defined(CONFIG_SYS_NIOS_TMRIRQ)
+#error CONFIG_SYS_NIOS_TMRIRQ not defined (see documentation)
+#endif
+
+/****************************************************************************/
+
+struct irq_action {
+ interrupt_handler_t *handler;
+ void *arg;
+ int count;
+};
+
+static struct irq_action vecs[32];
+
+/*************************************************************************/
+volatile ulong timestamp = 0;
+
+void reset_timer (void)
+{
+ nios_timer_t *tmr =(nios_timer_t *)CONFIG_SYS_NIOS_TMRBASE;
+
+ /* From Embedded Peripherals Handbook:
+ *
+ * "When the hardware is configured with Writeable period
+ * disabled, writing to one of the period_n registers causes
+ * the counter to reset to the fixed Timeout Period specified
+ * at system generation time."
+ *
+ * Here we force a reload to prevent early timeouts from
+ * get_timer() when the interrupt period is greater than
+ * than 1 msec.
+ *
+ * Simply write to periodl with its own value to force an
+ * internal counter reload, THEN reset the timestamp.
+ */
+ writel (readl (&tmr->periodl), &tmr->periodl);
+ timestamp = 0;
+
+ /* From Embedded Peripherals Handbook:
+ *
+ * "Writing to one of the period_n registers stops the internal
+ * counter, except when the hardware is configured with Start/Stop
+ * control bits off. If Start/Stop control bits is off, writing
+ * either register does not stop the counter."
+ *
+ * In order to accomodate either configuration, the control
+ * register is re-written. If the counter is stopped, it will
+ * be restarted. If it is running, the write is essentially
+ * a nop.
+ */
+ writel (NIOS_TIMER_ITO | NIOS_TIMER_CONT | NIOS_TIMER_START,
+ &tmr->control);
+
+}
+
+ulong get_timer (ulong base)
+{
+ WATCHDOG_RESET ();
+ return (timestamp - base);
+}
+
+void set_timer (ulong t)
+{
+ timestamp = t;
+}
+
+
+/* The board must handle this interrupt if a timer is not
+ * provided.
+ */
+#if defined(CONFIG_SYS_NIOS_TMRBASE)
+void tmr_isr (void *arg)
+{
+ nios_timer_t *tmr = (nios_timer_t *)arg;
+ /* Interrupt is cleared by writing anything to the
+ * status register.
+ */
+ writel (0, &tmr->status);
+ timestamp += CONFIG_SYS_NIOS_TMRMS;
+#ifdef CONFIG_STATUS_LED
+ status_led_tick(timestamp);
+#endif
+}
+
+static void tmr_init (void)
+{
+ nios_timer_t *tmr =(nios_timer_t *)CONFIG_SYS_NIOS_TMRBASE;
+
+ writel (0, &tmr->status);
+ writel (0, &tmr->control);
+ writel (NIOS_TIMER_STOP, &tmr->control);
+
+#if defined(CONFIG_SYS_NIOS_TMRCNT)
+ writel (CONFIG_SYS_NIOS_TMRCNT & 0xffff, &tmr->periodl);
+ writel ((CONFIG_SYS_NIOS_TMRCNT >> 16) & 0xffff, &tmr->periodh);
+#endif
+ writel (NIOS_TIMER_ITO | NIOS_TIMER_CONT | NIOS_TIMER_START,
+ &tmr->control);
+ irq_install_handler (CONFIG_SYS_NIOS_TMRIRQ, tmr_isr, (void *)tmr);
+}
+
+#endif /* CONFIG_SYS_NIOS_TMRBASE */
+
+/*************************************************************************/
+int disable_interrupts (void)
+{
+ int val = rdctl (CTL_STATUS);
+ wrctl (CTL_STATUS, val & ~STATUS_IE);
+ return (val & STATUS_IE);
+}
+
+void enable_interrupts( void )
+{
+ int val = rdctl (CTL_STATUS);
+ wrctl (CTL_STATUS, val | STATUS_IE);
+}
+
+void external_interrupt (struct pt_regs *regs)
+{
+ unsigned irqs;
+ struct irq_action *act;
+
+ /* Evaluate only irqs that are both enabled AND pending */
+ irqs = rdctl (CTL_IENABLE) & rdctl (CTL_IPENDING);
+ act = vecs;
+
+ /* Assume (as does the Nios2 HAL) that bit 0 is highest
+ * priority. NOTE: There is ALWAYS a handler assigned
+ * (the default if no other).
+ */
+ while (irqs) {
+ if (irqs & 1) {
+ act->handler (act->arg);
+ act->count++;
+ }
+ irqs >>=1;
+ act++;
+ }
+}
+
+static void def_hdlr (void *arg)
+{
+ unsigned irqs = rdctl (CTL_IENABLE);
+
+ /* Disable the individual interrupt -- with gratuitous
+ * warning.
+ */
+ irqs &= ~(1 << (int)arg);
+ wrctl (CTL_IENABLE, irqs);
+ printf ("WARNING: Disabling unhandled interrupt: %d\n",
+ (int)arg);
+}
+
+/*************************************************************************/
+void irq_install_handler (int irq, interrupt_handler_t *hdlr, void *arg)
+{
+
+ int flag;
+ struct irq_action *act;
+ unsigned ena = rdctl (CTL_IENABLE);
+
+ if ((irq < 0) || (irq > 31))
+ return;
+ act = &vecs[irq];
+
+ flag = disable_interrupts ();
+ if (hdlr) {
+ act->handler = hdlr;
+ act->arg = arg;
+ ena |= (1 << irq); /* enable */
+ } else {
+ act->handler = def_hdlr;
+ act->arg = (void *)irq;
+ ena &= ~(1 << irq); /* disable */
+ }
+ wrctl (CTL_IENABLE, ena);
+ if (flag) enable_interrupts ();
+}
+
+
+int interrupt_init (void)
+{
+ int i;
+
+ /* Assign the default handler to all */
+ for (i = 0; i < 32; i++) {
+ vecs[i].handler = def_hdlr;
+ vecs[i].arg = (void *)i;
+ vecs[i].count = 0;
+ }
+
+#if defined(CONFIG_SYS_NIOS_TMRBASE)
+ tmr_init ();
+#endif
+
+ enable_interrupts ();
+ return (0);
+}
+
+
+/*************************************************************************/
+#if defined(CONFIG_CMD_IRQ)
+int do_irqinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ int i;
+ struct irq_action *act = vecs;
+
+ printf ("\nInterrupt-Information:\n\n");
+ printf ("Nr Routine Arg Count\n");
+ printf ("-----------------------------\n");
+
+ for (i=0; i<32; i++) {
+ if (act->handler != def_hdlr) {
+ printf ("%02d %08lx %08lx %d\n",
+ i,
+ (ulong)act->handler,
+ (ulong)act->arg,
+ act->count);
+ }
+ act++;
+ }
+ printf ("\n");
+
+ return (0);
+}
+#endif
diff --git a/arch/nios2/cpu/start.S b/arch/nios2/cpu/start.S
new file mode 100644
index 000000000..31cd5b004
--- /dev/null
+++ b/arch/nios2/cpu/start.S
@@ -0,0 +1,217 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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 <config.h>
+#include <timestamp.h>
+#include <version.h>
+
+/*************************************************************************
+ * RESTART
+ ************************************************************************/
+
+ .text
+ .global _start
+
+_start:
+ /* ICACHE INIT -- only the icache line at the reset address
+ * is invalidated at reset. So the init must stay within
+ * the cache line size (8 words). If GERMS is used, we'll
+ * just be invalidating the cache a second time. If cache
+ * is not implemented initi behaves as nop.
+ */
+ ori r4, r0, %lo(CONFIG_SYS_ICACHELINE_SIZE)
+ movhi r5, %hi(CONFIG_SYS_ICACHE_SIZE)
+ ori r5, r5, %lo(CONFIG_SYS_ICACHE_SIZE)
+ mov r6, r0
+0: initi r6
+ add r6, r6, r4
+ bltu r6, r5, 0b
+ br _except_end /* Skip the tramp */
+
+ /* EXCEPTION TRAMPOLINE -- the following gets copied
+ * to the exception address (below), but is otherwise at the
+ * default exception vector offset (0x0020).
+ */
+_except_start:
+ movhi et, %hi(_exception)
+ ori et, et, %lo(_exception)
+ jmp et
+_except_end:
+
+ /* INTERRUPTS -- for now, all interrupts masked and globally
+ * disabled.
+ */
+ wrctl status, r0 /* Disable interrupts */
+ wrctl ienable, r0 /* All disabled */
+
+ /* DCACHE INIT -- if dcache not implemented, initd behaves as
+ * nop.
+ */
+ movhi r4, %hi(CONFIG_SYS_DCACHELINE_SIZE)
+ ori r4, r4, %lo(CONFIG_SYS_DCACHELINE_SIZE)
+ movhi r5, %hi(CONFIG_SYS_DCACHE_SIZE)
+ ori r5, r5, %lo(CONFIG_SYS_DCACHE_SIZE)
+ mov r6, r0
+1: initd 0(r6)
+ add r6, r6, r4
+ bltu r6, r5, 1b
+
+ /* RELOCATE CODE, DATA & COMMAND TABLE -- the following code
+ * assumes code, data and the command table are all
+ * contiguous. This lets us relocate everything as a single
+ * block. Make sure the linker script matches this ;-)
+ */
+ nextpc r4
+_cur: movhi r5, %hi(_cur - _start)
+ ori r5, r5, %lo(_cur - _start)
+ sub r4, r4, r5 /* r4 <- cur _start */
+ mov r8, r4
+ movhi r5, %hi(_start)
+ ori r5, r5, %lo(_start) /* r5 <- linked _start */
+ beq r4, r5, 3f
+
+ movhi r6, %hi(_edata)
+ ori r6, r6, %lo(_edata)
+2: ldwio r7, 0(r4)
+ addi r4, r4, 4
+ stwio r7, 0(r5)
+ addi r5, r5, 4
+ bne r5, r6, 2b
+3:
+
+ /* ZERO BSS/SBSS -- bss and sbss are assumed to be adjacent
+ * and between __bss_start and _end.
+ */
+ movhi r5, %hi(__bss_start)
+ ori r5, r5, %lo(__bss_start)
+ movhi r6, %hi(_end)
+ ori r6, r6, %lo(_end)
+ beq r5, r6, 5f
+
+4: stwio r0, 0(r5)
+ addi r5, r5, 4
+ bne r5, r6, 4b
+5:
+
+ /* GLOBAL POINTER -- the global pointer is used to reference
+ * "small data" (see -G switch). The linker script must
+ * provide the gp address.
+ */
+ movhi gp, %hi(_gp)
+ ori gp, gp, %lo(_gp)
+
+ /* JUMP TO RELOC ADDR */
+ movhi r4, %hi(_reloc)
+ ori r4, r4, %lo(_reloc)
+ jmp r4
+_reloc:
+
+ /* COPY EXCEPTION TRAMPOLINE -- copy the tramp to the
+ * exception address. Define CONFIG_ROM_STUBS to prevent
+ * the copy (e.g. exception in flash or in other
+ * softare/firmware component).
+ */
+#if !defined(CONFIG_ROM_STUBS)
+ movhi r4, %hi(_except_start)
+ ori r4, r4, %lo(_except_start)
+ movhi r5, %hi(_except_end)
+ ori r5, r5, %lo(_except_end)
+ movhi r6, %hi(CONFIG_SYS_EXCEPTION_ADDR)
+ ori r6, r6, %lo(CONFIG_SYS_EXCEPTION_ADDR)
+ beq r4, r6, 7f /* Skip if at proper addr */
+
+6: ldwio r7, 0(r4)
+ stwio r7, 0(r6)
+ addi r4, r4, 4
+ addi r6, r6, 4
+ bne r4, r5, 6b
+7:
+#endif
+
+ /* STACK INIT -- zero top two words for call back chain.
+ */
+ movhi sp, %hi(CONFIG_SYS_INIT_SP)
+ ori sp, sp, %lo(CONFIG_SYS_INIT_SP)
+ addi sp, sp, -8
+ stw r0, 0(sp)
+ stw r0, 4(sp)
+ mov fp, sp
+
+ /*
+ * Call board_init -- never returns
+ */
+ movhi r4, %hi(board_init@h)
+ ori r4, r4, %lo(board_init@h)
+ callr r4
+
+ /* NEVER RETURNS -- but branch to the _start just
+ * in case ;-)
+ */
+ br _start
+
+
+/*
+ * dly_clks -- Nios2 (like Nios1) doesn't have a timebase in
+ * the core. For simple delay loops, we do our best by counting
+ * instruction cycles.
+ *
+ * Instruction performance varies based on the core. For cores
+ * with icache and static/dynamic branch prediction (II/f, II/s):
+ *
+ * Normal ALU (e.g. add, cmp, etc): 1 cycle
+ * Branch (correctly predicted, taken): 2 cycles
+ * Negative offset is predicted (II/s).
+ *
+ * For cores without icache and no branch prediction (II/e):
+ *
+ * Normal ALU (e.g. add, cmp, etc): 6 cycles
+ * Branch (no prediction): 6 cycles
+ *
+ * For simplicity, if an instruction cache is implemented we
+ * assume II/f or II/s. Otherwise, we use the II/e.
+ *
+ */
+ .globl dly_clks
+
+dly_clks:
+
+#if (CONFIG_SYS_ICACHE_SIZE > 0)
+ subi r4, r4, 3 /* 3 clocks/loop */
+#else
+ subi r4, r4, 12 /* 12 clocks/loop */
+#endif
+ bge r4, r0, dly_clks
+ ret
+
+
+#if !defined(CONFIG_IDENT_STRING)
+#define CONFIG_IDENT_STRING ""
+#endif
+ .data
+ .globl version_string
+
+version_string:
+ .ascii U_BOOT_VERSION
+ .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
+ .ascii CONFIG_IDENT_STRING, "\0"
diff --git a/arch/nios2/cpu/sysid.c b/arch/nios2/cpu/sysid.c
new file mode 100644
index 000000000..77bc8b569
--- /dev/null
+++ b/arch/nios2/cpu/sysid.c
@@ -0,0 +1,58 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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>
+
+#if defined (CONFIG_SYS_NIOS_SYSID_BASE)
+
+#include <command.h>
+#include <asm/io.h>
+#include <nios2-io.h>
+#include <linux/time.h>
+
+void display_sysid (void)
+{
+ struct nios_sysid_t *sysid = (struct nios_sysid_t *)CONFIG_SYS_NIOS_SYSID_BASE;
+ struct tm t;
+ char asc[32];
+ time_t stamp;
+
+ stamp = readl (&sysid->timestamp);
+ localtime_r (&stamp, &t);
+ asctime_r (&t, asc);
+ printf ("SYSID : %08lx, %s", readl (&sysid->id), asc);
+
+}
+
+int do_sysid (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ display_sysid ();
+ return (0);
+}
+
+U_BOOT_CMD(
+ sysid, 1, 1, do_sysid,
+ "display Nios-II system id",
+ ""
+);
+#endif /* CONFIG_SYS_NIOS_SYSID_BASE */
diff --git a/arch/nios2/cpu/traps.c b/arch/nios2/cpu/traps.c
new file mode 100644
index 000000000..3f1517d61
--- /dev/null
+++ b/arch/nios2/cpu/traps.c
@@ -0,0 +1,42 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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 <asm/ptrace.h>
+#include <common.h>
+
+void trap_handler (struct pt_regs *regs)
+{
+ /* Just issue warning */
+ printf ("\n\n*** WARNING: unimplemented trap @ %08x\n\n",
+ regs->reg[29] - 4);
+}
+
+void soft_emulation (struct pt_regs *regs)
+{
+ /* TODO: Software emulation of mul/div etc. Until this is
+ * implemented, generate warning and hang.
+ */
+ printf ("\n\n*** ERROR: unimplemented instruction @ %08x\n",
+ regs->reg[29] - 4);
+ hang ();
+}