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Diffstat (limited to 'board/o2dnt/flash.c')
| -rw-r--r-- | board/o2dnt/flash.c | 423 |
1 files changed, 423 insertions, 0 deletions
diff --git a/board/o2dnt/flash.c b/board/o2dnt/flash.c new file mode 100644 index 0000000..64574f4 --- /dev/null +++ b/board/o2dnt/flash.c @@ -0,0 +1,423 @@ +/* + * (C) Copyright 2005 + * 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> + +flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */ + +/* NOTE - CONFIG_FLASH_16BIT means the CPU interface is 16-bit, it + * has nothing to do with the flash chip being 8-bit or 16-bit. + */ +#ifdef CONFIG_FLASH_16BIT +typedef unsigned short FLASH_PORT_WIDTH; +typedef volatile unsigned short FLASH_PORT_WIDTHV; +#define FLASH_ID_MASK 0xFFFF +#else +typedef unsigned char FLASH_PORT_WIDTH; +typedef volatile unsigned char FLASH_PORT_WIDTHV; +#define FLASH_ID_MASK 0xFF +#endif + +#define FPW FLASH_PORT_WIDTH +#define FPWV FLASH_PORT_WIDTHV + +#define ORMASK(size) ((-size) & OR_AM_MSK) + +#define FLASH_CYCLE1 0x0555 +#define FLASH_CYCLE2 0x02aa + +/*----------------------------------------------------------------------- + * Functions + */ +static ulong flash_get_size(FPWV *addr, flash_info_t *info); +static void flash_reset(flash_info_t *info); +static flash_info_t *flash_get_info(ulong base); +static int write_data (flash_info_t *info, FPWV *dest, FPW data); /* O2D */ + +/*----------------------------------------------------------------------- + * flash_init() + * + * sets up flash_info and returns size of FLASH (bytes) + */ +unsigned long flash_init (void) +{ + unsigned long size = 0; + int i; + extern void flash_preinit(void); + extern void flash_afterinit(ulong); + + flash_preinit(); + + /* Init: no FLASHes known */ + for (i = 0; i < CFG_MAX_FLASH_BANKS; ++i) { + memset(&flash_info[i], 0, sizeof(flash_info_t)); + flash_info[i].flash_id = FLASH_UNKNOWN; + } + + /* Query flash chip */ + flash_info[0].size = + flash_get_size((FPW *)CFG_FLASH_BASE, &flash_info[0]); + size += flash_info[0].size; + +#if CFG_MONITOR_BASE >= CFG_FLASH_BASE + /* monitor protection ON by default */ + flash_protect(FLAG_PROTECT_SET, + CFG_MONITOR_BASE, + CFG_MONITOR_BASE+monitor_flash_len-1, + flash_get_info(CFG_MONITOR_BASE)); +#endif + +#ifdef CFG_ENV_IS_IN_FLASH + /* ENV protection ON by default */ + flash_protect(FLAG_PROTECT_SET, + CFG_ENV_ADDR, + CFG_ENV_ADDR+CFG_ENV_SIZE-1, + flash_get_info(CFG_ENV_ADDR)); +#endif + + + flash_afterinit(size); + return (size ? size : 1); +} + +/*----------------------------------------------------------------------- + */ +static void flash_reset(flash_info_t *info) +{ + FPWV *base = (FPWV *)(info->start[0]); + + /* Put FLASH back in read mode */ + if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) + *base = (FPW)0x00FF00FF; /* Intel Read Mode */ +} + +/*----------------------------------------------------------------------- + */ + +static flash_info_t *flash_get_info(ulong base) +{ + int i; + flash_info_t * info; + + for (i = 0; i < CFG_MAX_FLASH_BANKS; i ++) { + info = & flash_info[i]; + if (info->size && + info->start[0] <= base && + base <= info->start[0] + info->size - 1) + break; + } + + return (i == CFG_MAX_FLASH_BANKS ? 0 : info); +} + +/*----------------------------------------------------------------------- + */ + +void flash_print_info (flash_info_t *info) +{ + int i; + uchar *boottype; + uchar *bootletter; + uchar *fmt; + uchar botbootletter[] = "B"; + uchar topbootletter[] = "T"; + uchar botboottype[] = "bottom boot sector"; + uchar topboottype[] = "top boot sector"; + + if (info->flash_id == FLASH_UNKNOWN) { + printf ("missing or unknown FLASH type\n"); + return; + } + + switch (info->flash_id & FLASH_VENDMASK) { + case FLASH_MAN_INTEL: + printf ("INTEL "); + break; + default: + printf ("Unknown Vendor "); + break; + } + + /* check for top or bottom boot, if it applies */ + if (info->flash_id & FLASH_BTYPE) { + boottype = botboottype; + bootletter = botbootletter; + } else { + boottype = topboottype; + bootletter = topbootletter; + } + + switch (info->flash_id & FLASH_TYPEMASK) { + case FLASH_28F128J3A: + fmt = "28F128J3 (128 Mbit, uniform sectors)\n"; + break; + default: + fmt = "Unknown Chip Type\n"; + break; + } + + printf (fmt, bootletter, boottype); + 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"); +} + +/*----------------------------------------------------------------------- + */ + +/* + * The following code cannot be run from FLASH! + */ +ulong flash_get_size (FPWV *addr, flash_info_t *info) +{ + int i; + + /* Write auto select command: read Manufacturer ID */ + /* Write auto select command sequence and test FLASH answer */ + addr[FLASH_CYCLE1] = (FPW)0x00900090; /* selects Intel or AMD */ + + /* The manufacturer codes are only 1 byte, so just use 1 byte. + * This works for any bus width and any FLASH device width. + */ + udelay(100); + switch (addr[0] & 0xff) { + case (uchar)INTEL_MANUFACT: + info->flash_id = FLASH_MAN_INTEL; + break; + default: + info->flash_id = FLASH_UNKNOWN; + info->sector_count = 0; + info->size = 0; + break; + } + + /* Strataflash is configurable to 8/16bit Bus, + * but the Query-Structure is Word-orientated */ + if (info->flash_id != FLASH_UNKNOWN) { + switch ((FPW)addr[2]) { + case (FPW)INTEL_ID_28F128J3: + info->flash_id += FLASH_28F128J3A; + info->sector_count = 128; + info->size = 0x01000000; + for( i = 0; i < info->sector_count; i++ ) + info->start[i] = (ulong)addr + (i * 0x20000); + break; /* => Intel Strataflash 16MB */ + default: + printf("Flash_id != %xd\n", (FPW)addr[2]); + info->flash_id = FLASH_UNKNOWN; + info->sector_count = 0; + info->size = 0; + return (0); /* => no or unknown flash */ + } + } + + /* Put FLASH back in read mode */ + flash_reset(info); + + return (info->size); +} + +/*----------------------------------------------------------------------- + */ + +int flash_erase (flash_info_t *info, int s_first, int s_last) +{ + FPWV *addr; + int flag, prot, sect; + ulong start, now, last; + int rcode = 0; + + 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; + } + + switch (info->flash_id & FLASH_TYPEMASK) { + case FLASH_28F128J3A: + break; + case FLASH_UNKNOWN: + default: + printf ("Can't erase unknown flash type %08lx - aborted\n", + info->flash_id); + 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!", + prot); + + printf ("\n"); + last = get_timer(0); + + /* Start erase on unprotected sectors */ + for (sect = s_first; sect <= s_last && rcode == 0; sect++) { + + if (info->protect[sect] != 0) /* protected, skip it */ + continue; + + /* Disable interrupts which might cause a timeout here */ + flag = disable_interrupts(); + + addr = (FPWV *)(info->start[sect]); + *addr = (FPW)0x00500050; /* clear status register */ + *addr = (FPW)0x00200020; /* erase setup */ + *addr = (FPW)0x00D000D0; /* erase confirm */ + + /* re-enable interrupts if necessary */ + if (flag) + enable_interrupts(); + + start = get_timer(0); + + /* wait at least 80us for Intel - let's wait 1 ms */ + udelay (1000); + + while ((*addr & (FPW)0x00800080) != (FPW)0x00800080) { + if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) { + printf ("Timeout\n"); + *addr = (FPW)0x00B000B0;/* suspend erase */ + flash_reset(info); /* reset to read mode */ + rcode = 1; /* failed */ + break; + } + + /* show that we're waiting */ + if ((get_timer(last)) > CFG_HZ) { /* every second */ + putc ('.'); + last = get_timer(0); + } + } + + flash_reset(info); /* reset to read mode */ + } + + printf (" done\n"); + return rcode; +} + +/*----------------------------------------------------------------------- + * 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) +{ + FPW data = 0; /* 16 or 32 bit word, matches flash bus width on MPC8XX */ + int bytes; /* number of bytes to program in current word */ + int left; /* number of bytes left to program */ + int i, res; + + for (left = cnt, res = 0; + left > 0 && res == 0; + addr += sizeof(data), left -= sizeof(data) - bytes) { + + bytes = addr & (sizeof(data) - 1); + addr &= ~(sizeof(data) - 1); + + /* combine source and destination data so can program + * an entire word of 16 or 32 bits */ + for (i = 0; i < sizeof(data); i++) { + data <<= 8; + if (i < bytes || i - bytes >= left ) + data += *((uchar *)addr + i); + else + data += *src++; + } + + /* write one word to the flash */ + switch (info->flash_id & FLASH_VENDMASK) { + case FLASH_MAN_INTEL: + res = write_data(info, (FPWV *)addr, data); + break; + default: + /* unknown flash type, error! */ + printf ("missing or unknown FLASH type\n"); + res = 1; /* not really a timeout, but gives error */ + break; + } + } + + return (res); +} + +/*----------------------------------------------------------------------- + * Write a word or halfword to Flash, returns: + * 0 - OK + * 1 - write timeout + * 2 - Flash not erased + */ +static int write_data (flash_info_t *info, FPWV *dest, FPW data) +{ + FPWV *addr = dest; + ulong status; + ulong start; + int flag; + + /* Check if Flash is (sufficiently) erased */ + if ((*addr & data) != data) { + printf ("not erased at %08lx (%lx)\n", (ulong) addr, *addr); + return (2); + } + /* Disable interrupts which might cause a timeout here */ + flag = disable_interrupts (); + + *addr = (FPW) 0x00400040; /* write setup */ + *addr = data; + + /* arm simple, non interrupt dependent timer */ + start = get_timer(0); + + /* wait while polling the status register */ + while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) { + if (get_timer(start) > CFG_FLASH_WRITE_TOUT) { + *addr = (FPW) 0x00FF00FF; /* restore read mode */ + return (1); + } + } + + *addr = (FPW) 0x00FF00FF; /* restore read mode */ + if (flag) + enable_interrupts(); + + return (0); +} |