diff options
Diffstat (limited to 'board/nx823')
| -rw-r--r-- | board/nx823/flash.c | 465 |
1 files changed, 465 insertions, 0 deletions
diff --git a/board/nx823/flash.c b/board/nx823/flash.c new file mode 100644 index 0000000..616a13f --- /dev/null +++ b/board/nx823/flash.c @@ -0,0 +1,465 @@ +/* + * (C) Copyright 2001 + * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net + * + * (C) Copyright 2001 + * 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> +#include <mpc8xx.h> + +flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */ +extern u_long *my_sernum; /* from nx823.c */ + +/*----------------------------------------------------------------------- + * Protection Flags: + */ +#define FLAG_PROTECT_SET 0x01 +#define FLAG_PROTECT_CLEAR 0x02 + +/* Board support for 1 or 2 flash devices */ +#undef FLASH_PORT_WIDTH32 +#define FLASH_PORT_WIDTH16 + +#ifdef FLASH_PORT_WIDTH16 +#define FLASH_PORT_WIDTH ushort +#define FLASH_PORT_WIDTHV vu_short +#else +#define FLASH_PORT_WIDTH ulong +#define FLASH_PORT_WIDTHV vu_long +#endif + +#define FPW FLASH_PORT_WIDTH +#define FPWV FLASH_PORT_WIDTHV + +/*----------------------------------------------------------------------- + * Functions + */ +static ulong flash_get_size (FPW *addr, flash_info_t *info); +static int write_data (flash_info_t *info, ulong dest, FPW data); +static void flash_get_offsets (ulong base, flash_info_t *info); + +/*----------------------------------------------------------------------- + */ + +unsigned long flash_init (void) +{ + volatile immap_t *immap = (immap_t *)CFG_IMMR; + volatile memctl8xx_t *memctl = &immap->im_memctl; + unsigned long size_b0; + int i; + + /* Init: no FLASHes known */ + for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) { + flash_info[i].flash_id = FLASH_UNKNOWN; + } + + /* Static FLASH Bank configuration here - FIXME XXX */ + size_b0 = flash_get_size((FPW *)FLASH_BASE0_PRELIM, &flash_info[0]); + + if (flash_info[0].flash_id == FLASH_UNKNOWN) { + printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n", + size_b0, size_b0<<20); + } + + /* Remap FLASH according to real size */ + memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-size_b0 & 0xFFFF8000); + memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_PS_16 | BR_MS_GPCM | BR_V; + + /* Re-do sizing to get full correct info */ + size_b0 = flash_get_size((FPW *)CFG_FLASH_BASE, &flash_info[0]); + + flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]); + + /* monitor protection ON by default */ + (void)flash_protect(FLAG_PROTECT_SET, + CFG_FLASH_BASE, + CFG_FLASH_BASE+CFG_MONITOR_LEN-1, + &flash_info[0]); + + flash_info[0].size = size_b0; + + return (size_b0); +} + +/*----------------------------------------------------------------------- + */ +static void flash_get_offsets (ulong base, flash_info_t *info) +{ + int i; + + if (info->flash_id == FLASH_UNKNOWN) { + return; + } + + if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) { + for (i = 0; i < info->sector_count; i++) { + info->start[i] = base + (i * 0x00020000); + } + } +} + +/*----------------------------------------------------------------------- + */ +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_INTEL: printf ("INTEL "); break; + default: printf ("Unknown Vendor "); break; + } + + switch (info->flash_id & FLASH_TYPEMASK) { + case FLASH_28F320J3A: + printf ("28F320J3A\n"); break; + case FLASH_28F640J3A: + printf ("28F640J3A\n"); break; + case FLASH_28F128J3A: + printf ("28F128J3A\n"); break; + default: printf ("Unknown Chip Type\n"); break; + } + + 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"); + return; +} + +/*----------------------------------------------------------------------- + */ + + +/*----------------------------------------------------------------------- + */ + +/* + * The following code cannot be run from FLASH! + */ + +static ulong flash_get_size (FPW *addr, flash_info_t *info) +{ + FPW value; + + /* Write auto select command: read Manufacturer ID */ + addr[0x5555] = (FPW)0x00AA00AA; + addr[0x2AAA] = (FPW)0x00550055; + addr[0x5555] = (FPW)0x00900090; + + value = addr[0]; + + switch (value) { + case (FPW)INTEL_MANUFACT: + info->flash_id = FLASH_MAN_INTEL; + break; + default: + info->flash_id = FLASH_UNKNOWN; + info->sector_count = 0; + info->size = 0; + addr[0] = (FPW)0x00FF00FF; /* restore read mode */ + return (0); /* no or unknown flash */ + } + + value = addr[1]; /* device ID */ + + switch (value) { + case (FPW)INTEL_ID_28F320J3A: + info->flash_id += FLASH_28F320J3A; + info->sector_count = 32; + info->size = 0x00400000; + break; /* => 4 MB */ + + case (FPW)INTEL_ID_28F640J3A: + info->flash_id += FLASH_28F640J3A; + info->sector_count = 64; + info->size = 0x00800000; + break; /* => 8 MB */ + + case (FPW)INTEL_ID_28F128J3A: + info->flash_id += FLASH_28F128J3A; + info->sector_count = 128; + info->size = 0x01000000; + break; /* => 16 MB */ + + default: + info->flash_id = FLASH_UNKNOWN; + break; + } + + if (info->sector_count > CFG_MAX_FLASH_SECT) { + printf ("** ERROR: sector count %d > max (%d) **\n", + info->sector_count, CFG_MAX_FLASH_SECT); + info->sector_count = CFG_MAX_FLASH_SECT; + } + + addr[0] = (FPW)0x00FF00FF; /* restore read mode */ + + return (info->size); +} + + +/*----------------------------------------------------------------------- + */ + +int flash_erase (flash_info_t *info, int s_first, int s_last) +{ + int flag, prot, sect; + ulong type, 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; + } + + type = (info->flash_id & FLASH_VENDMASK); + if ((type != FLASH_MAN_INTEL)) { + 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!\n", + prot); + } else { + printf ("\n"); + } + + start = get_timer (0); + last = start; + /* Start erase on unprotected sectors */ + for (sect = s_first; sect<=s_last; sect++) { + if (info->protect[sect] == 0) { /* not protected */ + FPWV *addr = (FPWV *)(info->start[sect]); + FPW status; + + /* Disable interrupts which might cause a timeout here */ + flag = disable_interrupts(); + + *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(); + + /* wait at least 80us - let's wait 1 ms */ + udelay (1000); + + while (((status = *addr) & (FPW)0x00800080) != (FPW)0x00800080) { + if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) { + printf ("Timeout\n"); + *addr = (FPW)0x00B000B0; /* suspend erase */ + *addr = (FPW)0x00FF00FF; /* reset to read mode */ + rcode = 1; + break; + } + + /* show that we're waiting */ + if ((now - last) > 1000) { /* every second */ + putc ('.'); + last = now; + } + } + + *addr = (FPW)0x00FF00FF; /* reset to read mode */ + printf (" done\n"); + } + } + return rcode; +} + +/*----------------------------------------------------------------------- + * Copy memory to flash, returns: + * 0 - OK + * 1 - write timeout + * 2 - Flash not erased + * 4 - Flash not identified + */ + +int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt) +{ + ulong cp, wp; + FPW data; + int count, i, l, rc, port_width; + + if (info->flash_id == FLASH_UNKNOWN) { + return 4; + } +/* get lower word aligned address */ +#ifdef FLASH_PORT_WIDTH16 + wp = (addr & ~1); + port_width = 2; +#else + wp = (addr & ~3); + port_width = 4; +#endif + + /* save sernum if needed */ + if (addr >= CFG_FLASH_SN_SECTOR && addr < CFG_FLASH_SN_BASE) + { + u_long dest = CFG_FLASH_SN_BASE; + u_short *sn = (u_short *)my_sernum; + + printf("(saving sernum)"); + for (i=0; i<4; i++) + { + if ((rc = write_data(info, dest, sn[i])) != 0) { + return (rc); + } + dest += port_width; + } + } + + /* + * handle unaligned start bytes + */ + if ((l = addr - wp) != 0) { + data = 0; + for (i=0, cp=wp; i<l; ++i, ++cp) { + data = (data << 8) | (*(uchar *)cp); + } + for (; i<port_width && cnt>0; ++i) { + data = (data << 8) | *src++; + --cnt; + ++cp; + } + for (; cnt==0 && i<port_width; ++i, ++cp) { + data = (data << 8) | (*(uchar *)cp); + } + + if ((rc = write_data(info, wp, data)) != 0) { + return (rc); + } + wp += port_width; + } + + /* + * handle word aligned part + */ + count = 0; + while (cnt >= port_width) { + data = 0; + for (i=0; i<port_width; ++i) { + data = (data << 8) | *src++; + } + if ((rc = write_data(info, wp, data)) != 0) { + return (rc); + } + wp += port_width; + cnt -= port_width; + if (count++ > 0x800) + { + putc('.'); + count = 0; + } + } + + if (cnt == 0) { + return (0); + } + + /* + * handle unaligned tail bytes + */ + data = 0; + for (i=0, cp=wp; i<port_width && cnt>0; ++i, ++cp) { + data = (data << 8) | *src++; + --cnt; + } + for (; i<port_width; ++i, ++cp) { + data = (data << 8) | (*(uchar *)cp); + } + + return (write_data(info, wp, data)); +} + +/*----------------------------------------------------------------------- + * 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, ulong dest, FPW data) +{ + FPWV *addr = (FPWV *)dest; + ulong status; + ulong start; + int flag; + + /* Check if Flash is (sufficiently) erased */ + if ((*addr & data) != data) { + printf("not erased at %08lx (%x)\n",(ulong)addr,*addr); + return (2); + } + /* Disable interrupts which might cause a timeout here */ + flag = disable_interrupts(); + + *addr = (FPW)0x00400040; /* write setup */ + *addr = data; + + /* re-enable interrupts if necessary */ + if (flag) + enable_interrupts(); + + start = get_timer (0); + + 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 */ + + return (0); +} + |