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authorwdenk <wdenk>2004-01-03 19:43:48 +0000
committerwdenk <wdenk>2004-01-03 19:43:48 +0000
commitc935d3bd8b1c7f681ad58e64bd0548e1b26a7d2f (patch)
tree2529369b185098e6d38627b7500d7450d9bab8f5 /board/altera/common/flash.c
parent3a473b2a6523db9cdf2b5aed22d9730b4ebc5693 (diff)
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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
Diffstat (limited to 'board/altera/common/flash.c')
-rw-r--r--board/altera/common/flash.c192
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);
+}