Initial revision

1 files changed, 396 insertions, 0 deletions

diff --git a/board/ep8260/flash.c b/board/ep8260/flash.c
new file mode 100644
index 0000000..cae8a13
--- /dev/null
+++ b/board/ep8260/flash.c
@@ -0,0 +1,396 @@
+/*
+ * (C) Copyright 2001, 2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2002
+ * Frank Panno <fpanno@delphintech.com>, Delphin Technology AG
+ *
+ * Flash Routines for AMD device AM29DL323DB on the EP8260 board.
+ *
+ * This file is based on board/tqm8260/flash.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>
+#include <mpc8xx.h>
+
+#define V_ULONG(a)	(*(volatile unsigned long *)( a ))
+#define V_BYTE(a)	(*(volatile unsigned char *)( a ))
+
+
+flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
+
+
+/*-----------------------------------------------------------------------
+ */
+void flash_reset(void)
+{
+  if( flash_info[0].flash_id != FLASH_UNKNOWN ) {
+    V_ULONG( flash_info[0].start[0] ) = 0x00F000F0;
+    V_ULONG( flash_info[0].start[0] + 4 ) = 0x00F000F0;
+  }
+}
+
+/*-----------------------------------------------------------------------
+ */
+ulong flash_get_size( ulong baseaddr, flash_info_t *info )
+{
+  short i;
+  unsigned long flashtest_h, flashtest_l;
+
+  /* Write auto select command sequence and test FLASH answer */
+  V_ULONG(baseaddr + ((ulong)0x0555 << 3)) = 0x00AA00AA;
+  V_ULONG(baseaddr + ((ulong)0x02AA << 3)) = 0x00550055;
+  V_ULONG(baseaddr + ((ulong)0x0555 << 3)) = 0x00900090;
+  V_ULONG(baseaddr + 4 + ((ulong)0x0555 << 3)) = 0x00AA00AA;
+  V_ULONG(baseaddr + 4 + ((ulong)0x02AA << 3)) = 0x00550055;
+  V_ULONG(baseaddr + 4 + ((ulong)0x0555 << 3)) = 0x00900090;
+
+  flashtest_h = V_ULONG(baseaddr);		/* manufacturer ID	   */
+  flashtest_l = V_ULONG(baseaddr + 4);
+
+  if ((int)flashtest_h == AMD_MANUFACT) {
+  	info->flash_id = FLASH_MAN_AMD;
+  } else {
+	info->flash_id = FLASH_UNKNOWN;
+	info->sector_count = 0;
+	info->size = 0;
+	return (0);  				/* no or unknown flash	   */
+  }
+
+  flashtest_h = V_ULONG(baseaddr + 8);	        /* device ID		   */
+  flashtest_l = V_ULONG(baseaddr + 12);
+  if (flashtest_h != flashtest_l) {
+    info->flash_id = FLASH_UNKNOWN;
+    return(0);
+  }
+  if (flashtest_h == AMD_ID_DL323B) {
+    info->flash_id += FLASH_AMDL323B;
+    info->sector_count = 71;
+    info->size = 0x01000000;	                /* 4 * 4 MB = 16 MB	*/
+  } else {
+    info->flash_id = FLASH_UNKNOWN;
+    return(0);  			 	/* no or unknown flash	   */
+  }
+
+  /* set up sector start adress table (bottom sector type) */
+  for (i = 0; i < 8; i++) {
+    info->start[i] = baseaddr + (i * 0x00008000);
+  }
+  for (i = 8; i < info->sector_count; i++) {
+    info->start[i] = baseaddr + (i * 0x00040000) - 0x001C0000;
+  }
+
+  /* check for protected sectors */
+  for (i = 0; i < info->sector_count; i++) {
+    /* read sector protection at sector address, (A7 .. A0) = 0x02 */
+    if ((V_ULONG( info->start[i] + 16 ) & 0x00010001) ||
+        (V_ULONG( info->start[i] + 20 ) & 0x00010001)) {
+	info->protect[i] = 1;		/* D0 = 1 if protected */
+    } else {
+    	info->protect[i] = 0;
+    }
+  }
+
+  flash_reset();
+  return(info->size);
+}
+
+/*-----------------------------------------------------------------------
+ */
+unsigned long flash_init (void)
+{
+    unsigned long size_b0 = 0;
+    int i;
+
+    /* Init: no FLASHes known */
+    for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
+	flash_info[i].flash_id = FLASH_UNKNOWN;
+    }
+
+    /* Static FLASH Bank configuration here (only one bank) */
+
+    size_b0 = flash_get_size(CFG_FLASH0_BASE, &flash_info[0]);
+    if (flash_info[0].flash_id == FLASH_UNKNOWN || size_b0 == 0) {
+	printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
+		size_b0, size_b0>>20);
+    }
+
+    /*
+     * protect monitor and environment sectors
+     */
+
+#if CFG_MONITOR_BASE >= CFG_FLASH0_BASE
+    flash_protect(FLAG_PROTECT_SET,
+		  CFG_MONITOR_BASE,
+		  CFG_MONITOR_BASE+CFG_MONITOR_LEN-1,
+		  &flash_info[0]);
+#endif
+
+#if (CFG_ENV_IS_IN_FLASH == 1) && defined(CFG_ENV_ADDR)
+# ifndef  CFG_ENV_SIZE
+#  define CFG_ENV_SIZE	CFG_ENV_SECT_SIZE
+# endif
+    flash_protect(FLAG_PROTECT_SET,
+		  CFG_ENV_ADDR,
+		  CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
+		  &flash_info[0]);
+#endif
+
+    return (size_b0);
+}
+
+/*-----------------------------------------------------------------------
+ */
+void flash_print_info  (flash_info_t *info)
+{
+    int i;
+
+    if (info->flash_id == FLASH_UNKNOWN) {
+	printf ("missing or unknown FLASH type\n");
+	return;
+    }
+
+    switch ((info->flash_id >> 16) & 0xff) {
+    case FLASH_MAN_AMD:	    printf ("AMD ");		    break;
+    default:		    printf ("Unknown Vendor ");	    break;
+    }
+
+    switch (info->flash_id & FLASH_TYPEMASK) {
+    case FLASH_AMDL323B:	printf ("29DL323B (32 M, bottom sector)\n");
+				break;
+    default:			printf ("Unknown Chip Type\n");
+				break;
+    }
+
+    printf ("  Size: %ld MB in %d Sectors\n",
+	    info->size >> 20, info->sector_count);
+
+    printf ("  Sector Start Addresses:");
+    for (i=0; i<info->sector_count; ++i) {
+	if ((i % 5) == 0)
+	  printf ("\n   ");
+	printf (" %08lX%s",
+		info->start[i],
+		info->protect[i] ? " (RO)" : "     "
+		);
+    }
+    printf ("\n");
+    return;
+}
+
+/*-----------------------------------------------------------------------
+ */
+int flash_erase (flash_info_t *info, int s_first, int s_last)
+{
+    int flag, prot, sect, l_sect;
+    ulong start, now, last;
+
+    if ((s_first < 0) || (s_first > s_last)) {
+	if (info->flash_id == FLASH_UNKNOWN) {
+	    printf ("- missing\n");
+	} else {
+	    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");
+    }
+
+    l_sect = -1;
+
+    /* Disable interrupts which might cause a timeout here */
+    flag = disable_interrupts();
+
+    V_ULONG( info->start[0] + (0x0555 << 3) ) = 0x00AA00AA;
+    V_ULONG( info->start[0] + (0x02AA << 3) ) = 0x00550055;
+    V_ULONG( info->start[0] + (0x0555 << 3) ) = 0x00800080;
+    V_ULONG( info->start[0] + (0x0555 << 3) ) = 0x00AA00AA;
+    V_ULONG( info->start[0] + (0x02AA << 3) ) = 0x00550055;
+    V_ULONG( info->start[0] + 4 + (0x0555 << 3) ) = 0x00AA00AA;
+    V_ULONG( info->start[0] + 4 + (0x02AA << 3) ) = 0x00550055;
+    V_ULONG( info->start[0] + 4 + (0x0555 << 3) ) = 0x00800080;
+    V_ULONG( info->start[0] + 4 + (0x0555 << 3) ) = 0x00AA00AA;
+    V_ULONG( info->start[0] + 4 + (0x02AA << 3) ) = 0x00550055;
+    udelay (1000);
+
+    /* Start erase on unprotected sectors */
+    for (sect = s_first; sect<=s_last; sect++) {
+	if (info->protect[sect] == 0) {	/* not protected */
+	    V_ULONG( info->start[sect] ) = 0x00300030;
+	    V_ULONG( info->start[sect] + 4 ) = 0x00300030;
+	    l_sect = sect;
+	}
+    }
+
+    /* re-enable interrupts if necessary */
+    if (flag)
+      enable_interrupts();
+
+    /* wait at least 80us - let's wait 1 ms */
+    udelay (1000);
+
+    /*
+     * We wait for the last triggered sector
+     */
+    if (l_sect < 0)
+      goto DONE;
+
+    start = get_timer (0);
+    last  = start;
+    while ((V_ULONG( info->start[l_sect] ) & 0x00800080) != 0x00800080 ||
+	   (V_ULONG( info->start[l_sect] + 4 ) & 0x00800080) != 0x00800080)
+    {
+	if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
+	    printf ("Timeout\n");
+	    return 1;
+	}
+	/* show that we're waiting */
+	if ((now - last) > 1000) {	/* every second */
+	    serial_putc ('.');
+	    last = now;
+	}
+    }
+
+    DONE:
+    /* reset to read mode */
+    flash_reset ();
+
+    printf (" done\n");
+    return 0;
+}
+
+static int write_dword (flash_info_t *, ulong, unsigned char *);
+
+/*-----------------------------------------------------------------------
+ * 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)
+{
+    ulong dp;
+    static unsigned char bb[8];
+    int i, l, rc, cc = cnt;
+
+    dp = (addr & ~7);	/* get lower dword aligned address */
+
+    /*
+     * handle unaligned start bytes
+     */
+    if ((l = addr - dp) != 0) {
+	for (i = 0; i < 8; i++)
+	    bb[i] = (i < l || (i-l) >= cc) ? V_BYTE(dp+i) : *src++;
+	if ((rc = write_dword(info, dp, bb)) != 0)
+	{
+	    return (rc);
+	}
+	dp += 8;
+	cc -= 8 - l;
+    }
+
+    /*
+     * handle word aligned part
+     */
+    while (cc >= 8) {
+	if ((rc = write_dword(info, dp, src)) != 0) {
+	    return (rc);
+	}
+	dp  += 8;
+	src += 8;
+	cc -= 8;
+    }
+
+    if (cc <= 0) {
+	return (0);
+    }
+
+    /*
+     * handle unaligned tail bytes
+     */
+    for (i = 0; i < 8; i++) {
+	bb[i] = (i < cc) ? *src++ : V_BYTE(dp+i);
+    }
+    return (write_dword(info, dp, bb));
+}
+
+/*-----------------------------------------------------------------------
+ * Write a dword to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int write_dword (flash_info_t *info, ulong dest, unsigned char * pdata)
+{
+    ulong start;
+    ulong cl = 0, ch =0;
+    int flag, i;
+
+    for (ch=0, i=0; i < 4; i++)
+	ch = (ch << 8) + *pdata++;	/* high word	*/
+    for (cl=0, i=0; i < 4; i++)
+	cl = (cl << 8) + *pdata++;	/* low word	*/
+
+    /* Check if Flash is (sufficiently) erased */
+    if ((*((vu_long *)dest) & ch)	!= ch
+      ||(*((vu_long *)(dest + 4)) & cl)	!= cl)
+    {
+	return (2);
+    }
+
+    /* Disable interrupts which might cause a timeout here */
+    flag = disable_interrupts();
+
+    V_ULONG( info->start[0] + (0x0555 << 3) ) = 0x00AA00AA;
+    V_ULONG( info->start[0] + (0x02AA << 3) ) = 0x00550055;
+    V_ULONG( info->start[0] + (0x0555 << 3) ) = 0x00A000A0;
+    V_ULONG( dest ) = ch;
+    V_ULONG( info->start[0] + 4 + (0x0555 << 3) ) = 0x00AA00AA;
+    V_ULONG( info->start[0] + 4 + (0x02AA << 3) ) = 0x00550055;
+    V_ULONG( info->start[0] + 4 + (0x0555 << 3) ) = 0x00A000A0;
+    V_ULONG( dest + 4 ) = cl;
+
+    /* re-enable interrupts if necessary */
+    if (flag)
+      enable_interrupts();
+
+    /* data polling for D7 */
+    start = get_timer (0);
+    while (((V_ULONG( dest ) & 0x00800080) != (ch & 0x00800080)) ||
+           ((V_ULONG( dest + 4 ) & 0x00800080) != (cl & 0x00800080))) {
+	if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+	    return (1);
+	}
+    }
+    return (0);
+}