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Diffstat (limited to 'board/oxc/flash.c')
| -rw-r--r-- | board/oxc/flash.c | 372 |
1 files changed, 372 insertions, 0 deletions
diff --git a/board/oxc/flash.c b/board/oxc/flash.c new file mode 100644 index 000000000..4f0220eab --- /dev/null +++ b/board/oxc/flash.c @@ -0,0 +1,372 @@ +/* + * (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+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); +} + +/*----------------------------------------------------------------------- + */ +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); +} + +/*----------------------------------------------------------------------- + */ |