452 lines
10 KiB
C
452 lines
10 KiB
C
/*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* Modified 4/5/2001
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* Wait for completion of each sector erase command issued
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* 4/5/2001
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* Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
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*/
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/*
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* Modified July 20, 2001
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* Strip down to support ONLY the AMD29F032B.
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* Dave Updegraff - Cray, Inc. dave@cray.com
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*/
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#include <common.h>
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#include <asm/ppc4xx.h>
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#include <asm/processor.h>
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/* The flash chip we use... */
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#define AMD_ID_F032B 0x41 /* 29F032B ID 32 Mbit,64 64Kx8 sectors */
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#define FLASH_AM320B 0x0009
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flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
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/*-----------------------------------------------------------------------
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* Functions
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*/
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static ulong flash_get_size (vu_long *addr, flash_info_t *info);
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static int write_word (flash_info_t *info, ulong dest, ulong data);
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static void flash_get_offsets (ulong base, flash_info_t *info);
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#define ADDR0 0x5555
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#define ADDR1 0x2aaa
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#define FLASH_WORD_SIZE unsigned char
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/*-----------------------------------------------------------------------
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*/
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unsigned long flash_init (void)
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{
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unsigned long size_b0, size_b1;
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int i;
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/* Init: no FLASHes known */
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for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
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flash_info[i].flash_id = FLASH_UNKNOWN;
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}
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/* Static FLASH Bank configuration here - FIXME XXX */
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size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
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if (flash_info[0].flash_id == FLASH_UNKNOWN) {
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printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
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size_b0, size_b0<<20);
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}
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/* Only one bank */
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if (CONFIG_SYS_MAX_FLASH_BANKS == 1)
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{
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/* Setup offsets */
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flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);
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#if 0
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/* Monitor protection ON by default */
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(void)flash_protect(FLAG_PROTECT_SET,
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FLASH_BASE0_PRELIM,
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FLASH_BASE0_PRELIM+monitor_flash_len-1,
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&flash_info[0]);
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#endif
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size_b1 = 0 ;
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flash_info[0].size = size_b0;
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}
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return (size_b0 + size_b1);
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}
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/*-----------------------------------------------------------------------
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*/
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static void flash_get_offsets (ulong base, flash_info_t *info)
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{
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int i;
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/* set up sector start address table */
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for (i = 0; i < info->sector_count; i++)
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info->start[i] = base + (i * 0x00010000);
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}
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/*-----------------------------------------------------------------------
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*/
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void flash_print_info (flash_info_t *info)
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{
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int i;
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int k;
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int size;
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int erased;
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volatile unsigned long *flash;
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if (info->flash_id == FLASH_UNKNOWN) {
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printf ("missing or unknown FLASH type\n");
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return;
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}
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switch (info->flash_id & FLASH_VENDMASK) {
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case FLASH_MAN_AMD: printf ("AMD "); break;
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default: printf ("Unknown Vendor "); break;
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}
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switch (info->flash_id & FLASH_TYPEMASK) {
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case FLASH_AM320B:printf ("AM29F032B (32 Mbit 64x64KB uniform sectors)\n");
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break;
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default: printf ("Unknown Chip Type\n");
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break;
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}
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printf (" Size: %ld KB in %d Sectors\n",
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info->size >> 10, info->sector_count);
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printf (" Sector Start Addresses:");
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for (i=0; i<info->sector_count; ++i) {
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/*
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* Check if whole sector is erased
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*/
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if (i != (info->sector_count-1))
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size = info->start[i+1] - info->start[i];
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else
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size = info->start[0] + info->size - info->start[i];
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erased = 1;
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flash = (volatile unsigned long *)info->start[i];
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size = size >> 2; /* divide by 4 for longword access */
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for (k=0; k<size; k++)
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{
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if (*flash++ != 0xffffffff)
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{
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erased = 0;
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break;
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}
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}
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if ((i % 5) == 0)
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printf ("\n ");
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printf (" %08lX%s%s",
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info->start[i],
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erased ? " E" : " ",
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info->protect[i] ? "RO " : " "
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);
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}
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printf ("\n");
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}
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/*-----------------------------------------------------------------------
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*/
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/*-----------------------------------------------------------------------
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*/
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/*
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* The following code cannot be run from FLASH!
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*/
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static ulong flash_get_size (vu_long *addr, flash_info_t *info)
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{
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short i;
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FLASH_WORD_SIZE value;
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ulong base = (ulong)addr;
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volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;
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/* Write auto select command: read Manufacturer ID */
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addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
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addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
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addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;
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value = addr2[0];
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switch (value) {
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case (FLASH_WORD_SIZE)AMD_MANUFACT:
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info->flash_id = FLASH_MAN_AMD;
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break;
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default:
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info->flash_id = FLASH_UNKNOWN;
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info->sector_count = 0;
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info->size = 0;
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return (0); /* no or unknown flash */
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}
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value = addr2[1]; /* device ID */
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switch (value) {
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case (FLASH_WORD_SIZE)AMD_ID_F032B:
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info->flash_id += FLASH_AM320B;
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info->sector_count = 64;
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info->size = 0x0400000; /* => 4 MB */
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break;
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default:
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info->flash_id = FLASH_UNKNOWN;
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return (0); /* => no or unknown flash */
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}
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/* set up sector start address table */
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for (i = 0; i < info->sector_count; i++)
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info->start[i] = base + (i * 0x00010000);
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/* check for protected sectors */
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for (i = 0; i < info->sector_count; i++) {
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/* read sector protection at sector address, (A7 .. A0) = 0x02 */
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/* D0 = 1 if protected */
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addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
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info->protect[i] = addr2[2] & 1;
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}
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/*
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* Prevent writes to uninitialized FLASH.
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*/
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if (info->flash_id != FLASH_UNKNOWN) {
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addr2 = (FLASH_WORD_SIZE *)info->start[0];
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*addr2 = (FLASH_WORD_SIZE)0x00F000F0; /* reset bank */
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}
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return (info->size);
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}
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int wait_for_DQ7(flash_info_t *info, int sect)
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{
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ulong start, now, last;
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volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[sect]);
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start = get_timer (0);
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last = start;
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while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
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if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
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printf ("Timeout\n");
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return -1;
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}
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/* show that we're waiting */
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if ((now - last) > 1000) { /* every second */
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putc ('.');
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last = now;
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}
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}
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return 0;
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}
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/*-----------------------------------------------------------------------
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*/
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int flash_erase (flash_info_t *info, int s_first, int s_last)
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{
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volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
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volatile FLASH_WORD_SIZE *addr2;
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int flag, prot, sect;
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if ((s_first < 0) || (s_first > s_last)) {
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if (info->flash_id == FLASH_UNKNOWN) {
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printf ("- missing\n");
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} else {
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printf ("- no sectors to erase\n");
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}
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return 1;
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}
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if (info->flash_id == FLASH_UNKNOWN) {
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printf ("Can't erase unknown flash type - aborted\n");
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return 1;
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}
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prot = 0;
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for (sect=s_first; sect<=s_last; ++sect) {
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if (info->protect[sect]) {
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prot++;
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}
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}
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if (prot) {
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printf ("- Warning: %d protected sectors will not be erased!\n",
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prot);
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} else {
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printf ("\n");
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}
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/* Disable interrupts which might cause a timeout here */
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flag = disable_interrupts();
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/* Start erase on unprotected sectors */
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for (sect = s_first; sect<=s_last; sect++) {
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if (info->protect[sect] == 0) { /* not protected */
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addr2 = (FLASH_WORD_SIZE *)(info->start[sect]);
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printf("Erasing sector %p\n", addr2);
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addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
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addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
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addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
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addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
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addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
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addr2[0] = (FLASH_WORD_SIZE)0x00300030; /* sector erase */
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/*
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* Wait for each sector to complete, it's more
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* reliable. According to AMD Spec, you must
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* issue all erase commands within a specified
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* timeout. This has been seen to fail, especially
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* if printf()s are included (for debug)!!
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*/
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wait_for_DQ7(info, sect);
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}
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}
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/* re-enable interrupts if necessary */
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if (flag)
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enable_interrupts();
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/* wait at least 80us - let's wait 1 ms */
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udelay (1000);
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/* reset to read mode */
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addr = (FLASH_WORD_SIZE *)info->start[0];
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addr[0] = (FLASH_WORD_SIZE)0x00F000F0; /* reset bank */
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printf (" done\n");
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return 0;
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}
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/*-----------------------------------------------------------------------
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* Copy memory to flash, returns:
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* 0 - OK
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* 1 - write timeout
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* 2 - Flash not erased
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*/
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int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
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{
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ulong cp, wp, data;
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int i, l, rc;
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wp = (addr & ~3); /* get lower word aligned address */
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/*
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* handle unaligned start bytes
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*/
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if ((l = addr - wp) != 0) {
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data = 0;
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for (i=0, cp=wp; i<l; ++i, ++cp) {
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data = (data << 8) | (*(uchar *)cp);
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}
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for (; i<4 && cnt>0; ++i) {
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data = (data << 8) | *src++;
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--cnt;
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++cp;
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}
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for (; cnt==0 && i<4; ++i, ++cp) {
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data = (data << 8) | (*(uchar *)cp);
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}
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if ((rc = write_word(info, wp, data)) != 0) {
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return (rc);
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}
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wp += 4;
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}
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/*
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* handle word aligned part
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*/
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while (cnt >= 4) {
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data = 0;
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for (i=0; i<4; ++i) {
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data = (data << 8) | *src++;
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}
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if ((rc = write_word(info, wp, data)) != 0) {
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return (rc);
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}
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wp += 4;
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cnt -= 4;
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}
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if (cnt == 0) {
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return (0);
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}
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/*
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* handle unaligned tail bytes
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*/
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data = 0;
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for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
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data = (data << 8) | *src++;
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--cnt;
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}
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for (; i<4; ++i, ++cp) {
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data = (data << 8) | (*(uchar *)cp);
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}
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return (write_word(info, wp, data));
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}
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/*-----------------------------------------------------------------------
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* Write a word to Flash, returns:
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* 0 - OK
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* 1 - write timeout
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* 2 - Flash not erased
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*/
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static int write_word (flash_info_t *info, ulong dest, ulong data)
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{
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volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)(info->start[0]);
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volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *)dest;
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volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;
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ulong start;
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int flag;
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int i;
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/* Check if Flash is (sufficiently) erased */
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if ((*((volatile FLASH_WORD_SIZE *)dest) &
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(FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
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return (2);
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}
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/* Disable interrupts which might cause a timeout here */
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flag = disable_interrupts();
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for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
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{
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addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
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addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
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addr2[ADDR0] = (FLASH_WORD_SIZE)0x00A000A0;
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dest2[i] = data2[i];
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/* re-enable interrupts if necessary */
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if (flag)
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enable_interrupts();
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/* data polling for D7 */
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start = get_timer (0);
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while ((dest2[i] & (FLASH_WORD_SIZE)0x00800080) !=
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(data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
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if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
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return (1);
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}
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}
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}
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return (0);
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}
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/*-----------------------------------------------------------------------
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*/
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