* Patch by Scott McNutt, 21 Oct 2004:
Add support for Nios-II EPCS Controller core.
* Patch by Scott McNutt, 20 Oct 2004:
Nios-II cleanups:
- Add sysid command (Nios-II only).
- Locate default exception trampoline at proper offset.
- Implement I/O routines (readb, writeb, etc)
- Implement do_bootm_linux
diff --git a/cpu/nios2/epcs.c b/cpu/nios2/epcs.c
new file mode 100644
index 0000000..a8851e9
--- /dev/null
+++ b/cpu/nios2/epcs.c
@@ -0,0 +1,711 @@
+/*
+ * (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(CFG_NIOS_EPCSBASE)
+#include <command.h>
+#include <nios2.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.\n"
+
+
+/*-----------------------------------------------------------------------*/
+/* 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 *)CACHE_BYPASS(CFG_NIOS_EPCSBASE);
+
+/***********************************************************************
+ * Device access
+ ***********************************************************************/
+static int epcs_cs (int assert)
+{
+ ulong start;
+
+ if (assert) {
+ epcs->control |= NIOS_SPI_SSO;
+ } else {
+ /* Let all bits shift out */
+ start = get_timer (0);
+ while ((epcs->status & NIOS_SPI_TMT) == 0)
+ if (get_timer (start) > EPCS_TIMEOUT)
+ return (-1);
+ epcs->control &= ~NIOS_SPI_SSO;
+ }
+ return (0);
+}
+
+static int epcs_tx (unsigned char c)
+{
+ ulong start;
+
+ start = get_timer (0);
+ while ((epcs->status & NIOS_SPI_TRDY) == 0)
+ if (get_timer (start) > EPCS_TIMEOUT)
+ return (-1);
+ epcs->txdata = c;
+ return (0);
+}
+
+static int epcs_rx (void)
+{
+ ulong start;
+
+ start = get_timer (0);
+ while ((epcs->status & NIOS_SPI_RRDY) == 0)
+ if (get_timer (start) > EPCS_TIMEOUT)
+ return (-1);
+ return (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 },
+ { 0, 0, 0, 0, 0, 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; i++) {
+ erased = epcs_sect_erased (i, &tmp, dev);
+ printf (" %d: %06x ",
+ i, i*(1<<dev->sz_sect) );
+ if (erased)
+ printf ("erased\n");
+ else
+ printf ("data @ 0x%06x\n", tmp);
+ }
+
+ 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 */