Patches by Stephan Linz, 11 Dec 2003:

- more documentation for NIOS port
- new struct nios_pio_t, struct nios_spi_t
- Reconfiguration for NIOS Development Kit DK1C20:
  o move board related code from board/dk1c20
    to board/altera/dk1c20
  o create a new common source path board/altera/common
    and move generic flash access stuff into it
  o change/expand configuration file DK1C20.h
- Add support for NIOS Development Kit DK1S10
- Add status LED support for NIOS systems
- Add dual 7-segment LED support for Altera NIOS DevKits

1 files changed, 192 insertions, 0 deletions

diff --git a/board/altera/common/flash.c b/board/altera/common/flash.c
new file mode 100644
index 0000000..0fa74ab
--- /dev/null
+++ b/board/altera/common/flash.c
@@ -0,0 +1,192 @@
+/*
+ * (C) Copyright 2000-2004
+ * 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 <common.h>
+#include <nios.h>
+
+flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
+
+/*--------------------------------------------------------------------*/
+void flash_print_info (flash_info_t * info)
+{
+	int i, k;
+	unsigned long size;
+	int erased;
+	volatile unsigned char *flash;
+
+	printf ("  Size: %ld KB in %d Sectors\n",
+		info->size >> 10, info->sector_count);
+	printf ("  Sector Start Addresses:");
+	for (i = 0; i < info->sector_count; ++i) {
+
+		/* Check if whole sector is erased */
+		if (i != (info->sector_count - 1))
+			size = info->start[i + 1] - info->start[i];
+		else
+			size = info->start[0] + info->size - info->start[i];
+		erased = 1;
+		flash = (volatile unsigned char *) info->start[i];
+		for (k = 0; k < size; k++) {
+			if (*flash++ != 0xff) {
+				erased = 0;
+				break;
+			}
+		}
+
+		/* Print the info */
+		if ((i % 5) == 0)
+			printf ("\n   ");
+		printf (" %08lX%s%s", info->start[i], erased ? " E" : "  ",
+			info->protect[i] ? "RO " : "   ");
+	}
+	printf ("\n");
+}
+
+/*-------------------------------------------------------------------*/
+
+
+int flash_erase (flash_info_t * info, int s_first, int s_last)
+{
+	volatile CFG_FLASH_WORD_SIZE *addr = (CFG_FLASH_WORD_SIZE *) (info->start[0]);
+	volatile CFG_FLASH_WORD_SIZE *addr2;
+	int prot, sect;
+	int any = 0;
+	unsigned oldpri;
+	ulong start;
+
+	/* Some sanity checking */
+	if ((s_first < 0) || (s_first > s_last)) {
+		printf ("- no sectors to erase\n");
+		return 1;
+	}
+
+	prot = 0;
+	for (sect = s_first; sect <= s_last; ++sect) {
+		if (info->protect[sect]) {
+			prot++;
+		}
+	}
+	if (prot) {
+		printf ("- Warning: %d protected sectors will not be erased!\n",
+			prot);
+	} else {
+		printf ("\n");
+	}
+
+	/* NOTE: disabling interrupts on Nios can be very bad since it
+	 * also disables the LO_LIMIT exception. It's better here to
+	 * set the interrupt priority to 3 & restore it when we're done.
+	 */
+	oldpri = ipri (3);
+
+	/* It's ok to erase multiple sectors provided we don't delay more
+	 * than 50 usec between cmds ... at which point the erase time-out
+	 * occurs. So don't go and put printf() calls in the loop ... it
+	 * won't be very helpful ;-)
+	 */
+	for (sect = s_first; sect <= s_last; sect++) {
+		if (info->protect[sect] == 0) {	/* not protected */
+			addr2 = (CFG_FLASH_WORD_SIZE *) (info->start[sect]);
+			*addr = 0xaa;
+			*addr = 0x55;
+			*addr = 0x80;
+			*addr = 0xaa;
+			*addr = 0x55;
+			*addr2 = 0x30;
+			any = 1;
+		}
+	}
+
+	/* Now just wait for 0xff & provide some user feedback while
+	 * we wait.
+	 */
+	if (any) {
+		addr2 = (CFG_FLASH_WORD_SIZE *) (info->start[sect]);
+		start = get_timer (0);
+		while (*addr2 != 0xff) {
+			udelay (1000 * 1000);
+			putc ('.');
+			if (get_timer (start) > CFG_FLASH_ERASE_TOUT) {
+				printf ("timeout\n");
+				return 1;
+			}
+		}
+		printf ("\n");
+	}
+
+	/* Restore interrupt priority */
+	ipri (oldpri);
+
+	return 0;
+}
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+
+int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
+{
+
+	vu_char *cmd = (vu_char *) info->start[0];
+	vu_char *dst = (vu_char *) addr;
+	unsigned char b;
+	unsigned oldpri;
+	ulong start;
+
+	while (cnt) {
+		/* Check for sufficient erase */
+		b = *src;
+		if ((*dst & b) != b) {
+			printf ("%02x : %02x\n", *dst, b);
+			return (2);
+		}
+
+		/* Disable interrupts other than window underflow
+		 * (interrupt priority 2)
+		 */
+		oldpri = ipri (3);
+		*cmd = 0xaa;
+		*cmd = 0x55;
+		*cmd = 0xa0;
+		*dst = b;
+
+		/* Verify write */
+		start = get_timer (0);
+		while (*dst != b) {
+			if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
+				ipri (oldpri);
+				return 1;
+			}
+		}
+		dst++;
+		src++;
+		cnt--;
+		ipri (oldpri);
+	}
+
+	return (0);
+}