/* * (C) Copyright 2000 * Marius Groeger <mgroeger@sysgo.de> * Sysgo Real-Time Solutions, GmbH <www.elinos.com> * * (C) Copyright 2000 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * Flash Routines for STM29W320DB/STM29W800D flash chips * *-------------------------------------------------------------------- * 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> flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */ /*----------------------------------------------------------------------- * Functions */ static ulong flash_get_size (vu_char *addr, flash_info_t *info); static int write_byte (flash_info_t *info, ulong dest, uchar data); /*----------------------------------------------------------------------- */ unsigned long flash_init (void) { unsigned long size; int i; /* Init: no FLASHes known */ for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) { flash_info[i].flash_id = FLASH_UNKNOWN; } /* * We use the following trick here: since flash is cyclically * mapped in the 0xFF800000-0xFFFFFFFF area, we detect the type * and the size of flash using 0xFF800000 as the base address, * and then call flash_get_size() again to fill flash_info. */ size = flash_get_size((vu_char *)CFG_FLASH_PRELIMBASE, &flash_info[0]); if (size) { flash_get_size((vu_char *)(-size), &flash_info[0]); } #if (CFG_MONITOR_BASE >= CFG_FLASH_PRELIMBASE) /* monitor protection ON by default */ flash_protect(FLAG_PROTECT_SET, CFG_MONITOR_BASE, CFG_MONITOR_BASE+monitor_flash_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); } /*----------------------------------------------------------------------- */ 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 & FLASH_VENDMASK) { case FLASH_MAN_STM: printf ("ST "); break; default: printf ("Unknown Vendor "); break; } switch (info->flash_id & FLASH_TYPEMASK) { case FLASH_STM320DB: printf ("M29W320DB (32 Mbit)\n"); break; case FLASH_STM800DB: printf ("M29W800DB (8 Mbit, bottom boot block)\n"); break; case FLASH_STM800DT: printf ("M29W800DT (8 Mbit, top boot block)\n"); break; default: printf ("Unknown Chip Type\n"); break; } 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) { if ((i % 5) == 0) printf ("\n "); printf (" %08lX%s", info->start[i], info->protect[i] ? " (RO)" : " " ); } printf ("\n"); return; } /* * The following code cannot be run from FLASH! */ static ulong flash_get_size (vu_char *addr, flash_info_t *info) { short i; uchar vendor, devid; ulong base = (ulong)addr; /* Write auto select command: read Manufacturer ID */ addr[0x0AAA] = 0xAA; addr[0x0555] = 0x55; addr[0x0AAA] = 0x90; udelay(1000); vendor = addr[0]; devid = addr[2]; /* only support STM */ if ((vendor << 16) != FLASH_MAN_STM) { return 0; } if (devid == FLASH_STM320DB) { /* MPC8240 can address maximum 2Mb of flash, that is why the MSB * lead is grounded and we can access only 2 first Mb */ info->flash_id = vendor << 16 | devid; info->sector_count = 32; info->size = info->sector_count * 0x10000; for (i = 0; i < info->sector_count; i++) { info->start[i] = base + i * 0x10000; } } else if (devid == FLASH_STM800DB) { info->flash_id = vendor << 16 | devid; info->sector_count = 19; info->size = 0x100000; info->start[0] = 0x0000; info->start[1] = 0x4000; info->start[2] = 0x6000; info->start[3] = 0x8000; for (i = 4; i < info->sector_count; i++) { info->start[i] = base + (i-3) * 0x10000; } } else if (devid == FLASH_STM800DT) { info->flash_id = vendor << 16 | devid; info->sector_count = 19; info->size = 0x100000; for (i = 0; i < info->sector_count-4; i++) { info->start[i] = base + i * 0x10000; } info->start[i] = base + i * 0x10000; info->start[i+1] = base + i * 0x10000 + 0x8000; info->start[i+2] = base + i * 0x10000 + 0xa000; info->start[i+3] = base + i * 0x10000 + 0xc000; } else { return 0; } /* mark all sectors as unprotected */ for (i = 0; i < info->sector_count; i++) { info->protect[i] = 0; } /* Issue the reset command */ if (info->flash_id != FLASH_UNKNOWN) { addr[0] = 0xF0; /* reset bank */ } return (info->size); } /*----------------------------------------------------------------------- */ int flash_erase (flash_info_t *info, int s_first, int s_last) { vu_char *addr = (vu_char *)(info->start[0]); 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(); addr[0x0AAA] = 0xAA; addr[0x0555] = 0x55; addr[0x0AAA] = 0x80; addr[0x0AAA] = 0xAA; addr[0x0555] = 0x55; /* wait at least 80us - let's wait 1 ms */ udelay (1000); /* Start erase on unprotected sectors */ for (sect = s_first; sect<=s_last; sect++) { if (info->protect[sect] == 0) { /* not protected */ addr = (vu_char *)(info->start[sect]); addr[0] = 0x30; 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; addr = (vu_char *)(info->start[l_sect]); while ((addr[0] & 0x80) != 0x80) { 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 */ addr = (volatile unsigned char *)info->start[0]; addr[0] = 0xF0; /* reset bank */ printf (" done\n"); 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) { int rc; while (cnt > 0) { if ((rc = write_byte(info, addr, *src)) != 0) { return (rc); } addr++; src++; cnt--; } return (0); } /*----------------------------------------------------------------------- * Write a byte to Flash, returns: * 0 - OK * 1 - write timeout * 2 - Flash not erased */ static int write_byte (flash_info_t *info, ulong dest, uchar data) { vu_char *addr = (vu_char *)(info->start[0]); ulong start; int flag; /* Check if Flash is (sufficiently) erased */ if ((*((vu_char *)dest) & data) != data) { return (2); } /* Disable interrupts which might cause a timeout here */ flag = disable_interrupts(); addr[0x0AAA] = 0xAA; addr[0x0555] = 0x55; addr[0x0AAA] = 0xA0; *((vu_char *)dest) = data; /* re-enable interrupts if necessary */ if (flag) enable_interrupts(); /* data polling for D7 */ start = get_timer (0); while ((*((vu_char *)dest) & 0x80) != (data & 0x80)) { if (get_timer(start) > CFG_FLASH_WRITE_TOUT) { return (1); } } return (0); } /*----------------------------------------------------------------------- */