diff options
Diffstat (limited to 'board/wepep250/flash.c')
| -rw-r--r-- | board/wepep250/flash.c | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/board/wepep250/flash.c b/board/wepep250/flash.c new file mode 100644 index 0000000..319dddc --- /dev/null +++ b/board/wepep250/flash.c @@ -0,0 +1,321 @@ +/* + * Copyright (C) 2003 ETC s.r.o. + * + * This code was inspired by Marius Groeger and Kyle Harris code + * available in other board ports for U-Boot + * + * 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 + * + * Written by Peter Figuli <peposh@etc.sk>, 2003. + * + */ + +#include <common.h> +#include "intel.h" + + +/* + * This code should handle CFI FLASH memory device. This code is very + * minimalistic approach without many essential error handling code as well. + * Because U-Boot actually is missing smart handling of FLASH device, + * we just set flash_id to anything else to FLASH_UNKNOW, so common code + * can call us without any restrictions. + * TODO: Add CFI Query, to be able to determine FLASH device. + * TODO: Add error handling code + * NOTE: This code was tested with BUS_WIDTH 4 and ITERLEAVE 2 only, but + * hopefully may work with other configurations. + */ + +#if ( WEP_FLASH_BUS_WIDTH == 1 ) +# define FLASH_BUS vu_char +# if ( WEP_FLASH_INTERLEAVE == 1 ) +# define FLASH_CMD( x ) x +# else +# error "With 8bit bus only one chip is allowed" +# endif + + +#elif ( WEP_FLASH_BUS_WIDTH == 2 ) +# define FLASH_BUS vu_short +# if ( WEP_FLASH_INTERLEAVE == 1 ) +# define FLASH_CMD( x ) x +# elif ( WEP_FLASH_INTERLEAVE == 2 ) +# define FLASH_CMD( x ) (( x << 8 )| x ) +# else +# error "With 16bit bus only 1 or 2 chip(s) are allowed" +# endif + + +#elif ( WEP_FLASH_BUS_WIDTH == 4 ) +# define FLASH_BUS vu_long +# if ( WEP_FLASH_INTERLEAVE == 1 ) +# define FLASH_CMD( x ) x +# elif ( WEP_FLASH_INTERLEAVE == 2 ) +# define FLASH_CMD( x ) (( x << 16 )| x ) +# elif ( WEP_FLASH_INTERLEAVE == 4 ) +# define FLASH_CMD( x ) (( x << 24 )|( x << 16 ) ( x << 8 )| x ) +# else +# error "With 32bit bus only 1,2 or 4 chip(s) are allowed" +# endif + +#else +# error "Flash bus width might be 1,2,4 for 8,16,32 bit configuration" +#endif + + +flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; + +static FLASH_BUS flash_status_reg (void) +{ + + FLASH_BUS *addr = (FLASH_BUS *) 0; + + *addr = FLASH_CMD (CFI_INTEL_CMD_READ_STATUS_REGISTER); + + return *addr; +} + +static int flash_ready (ulong timeout) +{ + int ok = 1; + + reset_timer_masked (); + while ((flash_status_reg () & FLASH_CMD (CFI_INTEL_SR_READY)) != + FLASH_CMD (CFI_INTEL_SR_READY)) { + if (get_timer_masked () > timeout && timeout != 0) { + ok = 0; + break; + } + } + return ok; +} + +#if ( CFG_MAX_FLASH_BANKS != 1 ) +# error "WEP platform has only one flash bank!" +#endif + + +ulong flash_init (void) +{ + int i; + FLASH_BUS address = WEP_FLASH_BASE; + + flash_info[0].size = WEP_FLASH_BANK_SIZE; + flash_info[0].sector_count = CFG_MAX_FLASH_SECT; + flash_info[0].flash_id = INTEL_MANUFACT; + memset (flash_info[0].protect, 0, CFG_MAX_FLASH_SECT); + + for (i = 0; i < CFG_MAX_FLASH_SECT; i++) { + flash_info[0].start[i] = address; +#ifdef WEP_FLASH_UNLOCK + /* Some devices are hw locked after start. */ + *((FLASH_BUS *) address) = FLASH_CMD (CFI_INTEL_CMD_LOCK_SETUP); + *((FLASH_BUS *) address) = FLASH_CMD (CFI_INTEL_CMD_UNLOCK_BLOCK); + flash_ready (0); + *((FLASH_BUS *) address) = FLASH_CMD (CFI_INTEL_CMD_READ_ARRAY); +#endif + address += WEP_FLASH_SECT_SIZE; + } + + flash_protect (FLAG_PROTECT_SET, + CFG_FLASH_BASE, + CFG_FLASH_BASE + _armboot_end_data - _armboot_start, + &flash_info[0]); + + flash_protect (FLAG_PROTECT_SET, + CFG_ENV_ADDR, + CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0]); + + return WEP_FLASH_BANK_SIZE; +} + +void flash_print_info (flash_info_t * info) +{ + int i; + + printf (" Intel vendor\n"); + 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)) { + printf ("\n"); + } + + printf (" %08lX%s", info->start[i], + info->protect[i] ? " (RO)" : " "); + } + printf ("\n"); +} + + +int flash_erase (flash_info_t * info, int s_first, int s_last) +{ + int flag, non_protected = 0, sector; + int rc = ERR_OK; + + FLASH_BUS *address; + + for (sector = s_first; sector <= s_last; sector++) { + if (!info->protect[sector]) { + non_protected++; + } + } + + if (!non_protected) { + return ERR_PROTECTED; + } + + /* + * Disable interrupts which might cause a timeout + * here. Remember that our exception vectors are + * at address 0 in the flash, and we don't want a + * (ticker) exception to happen while the flash + * chip is in programming mode. + */ + flag = disable_interrupts (); + + + /* Start erase on unprotected sectors */ + for (sector = s_first; sector <= s_last && !ctrlc (); sector++) { + if (info->protect[sector]) { + printf ("Protected sector %2d skipping...\n", sector); + continue; + } else { + printf ("Erasing sector %2d ... ", sector); + } + + address = (FLASH_BUS *) (info->start[sector]); + + *address = FLASH_CMD (CFI_INTEL_CMD_BLOCK_ERASE); + *address = FLASH_CMD (CFI_INTEL_CMD_CONFIRM); + if (flash_ready (CFG_FLASH_ERASE_TOUT)) { + *address = FLASH_CMD (CFI_INTEL_CMD_CLEAR_STATUS_REGISTER); + printf ("ok.\n"); + } else { + *address = FLASH_CMD (CFI_INTEL_CMD_SUSPEND); + rc = ERR_TIMOUT; + printf ("timeout! Aborting...\n"); + break; + } + *address = FLASH_CMD (CFI_INTEL_CMD_READ_ARRAY); + } + if (ctrlc ()) + printf ("User Interrupt!\n"); + + /* allow flash to settle - wait 10 ms */ + udelay_masked (10000); + if (flag) { + enable_interrupts (); + } + + return rc; +} + +static int write_data (flash_info_t * info, ulong dest, FLASH_BUS data) +{ + FLASH_BUS *address = (FLASH_BUS *) dest; + int rc = ERR_OK; + int flag; + + /* Check if Flash is (sufficiently) erased */ + if ((*address & data) != data) { + return ERR_NOT_ERASED; + } + + /* + * Disable interrupts which might cause a timeout + * here. Remember that our exception vectors are + * at address 0 in the flash, and we don't want a + * (ticker) exception to happen while the flash + * chip is in programming mode. + */ + + flag = disable_interrupts (); + + *address = FLASH_CMD (CFI_INTEL_CMD_CLEAR_STATUS_REGISTER); + *address = FLASH_CMD (CFI_INTEL_CMD_PROGRAM1); + *address = data; + + if (!flash_ready (CFG_FLASH_WRITE_TOUT)) { + *address = FLASH_CMD (CFI_INTEL_CMD_SUSPEND); + rc = ERR_TIMOUT; + printf ("timeout! Aborting...\n"); + } + + *address = FLASH_CMD (CFI_INTEL_CMD_READ_ARRAY); + if (flag) { + enable_interrupts (); + } + + return rc; +} + +int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt) +{ + ulong read_addr, write_addr; + FLASH_BUS data; + int i, result = ERR_OK; + + + read_addr = addr & ~(sizeof (FLASH_BUS) - 1); + write_addr = read_addr; + if (read_addr != addr) { + data = 0; + for (i = 0; i < sizeof (FLASH_BUS); i++) { + if (read_addr < addr || cnt == 0) { + data |= *((uchar *) read_addr) << i * 8; + } else { + data |= (*src++) << i * 8; + cnt--; + } + read_addr++; + } + if ((result = write_data (info, write_addr, data)) != ERR_OK) { + return result; + } + write_addr += sizeof (FLASH_BUS); + } + for (; cnt >= sizeof (FLASH_BUS); cnt -= sizeof (FLASH_BUS)) { + if ((result = write_data (info, write_addr, + *((FLASH_BUS *) src))) != ERR_OK) { + return result; + } + write_addr += sizeof (FLASH_BUS); + src += sizeof (FLASH_BUS); + } + if (cnt > 0) { + read_addr = write_addr; + data = 0; + for (i = 0; i < sizeof (FLASH_BUS); i++) { + if (cnt > 0) { + data |= (*src++) << i * 8; + cnt--; + } else { + data |= *((uchar *) read_addr) << i * 8; + } + read_addr++; + } + if ((result = write_data (info, write_addr, data)) != 0) { + return result; + } + } + return ERR_OK; +} |