flash.c

嵌入式ARM的一些源代码

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * 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 <ppcboot.h>
#include <cogent/flash.h>

flash_info_t	flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips	*/

/*-----------------------------------------------------------------------
 * Functions
 */
static int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt);
static int write_word (flash_info_t *info, ulong dest, ulong data);
static int  flash_protect (int flag, ulong from, ulong to, flash_info_t *info);

/*-----------------------------------------------------------------------
 * Protection Flags:
 */
#define FLAG_PROTECT_SET	0x01
#define FLAG_PROTECT_CLEAR	0x02

/*-----------------------------------------------------------------------
 */


#if defined(CONFIG_CMA302)

/*
 * probe for the existence of flash at address "addr"
 * 0 = yes, 1 = bad Manufacturer's Id, 2 = bad Device Id
 */
static int
c302f_probe_word(c302f_addr_t addr)
{
	/* reset the flash */
	*addr = C302F_BNK_CMD_RST;

	/* check the manufacturer id */
	*addr = C302F_BNK_CMD_RD_ID;
	if (*C302F_BNK_ADDR_MAN(addr) != C302F_BNK_RD_ID_MAN)
		return 1;

	/* check the device id */
	*addr = C302F_BNK_CMD_RD_ID;
	if (*C302F_BNK_ADDR_DEV(addr) != C302F_BNK_RD_ID_DEV)
		return 2;

#ifdef FLASH_DEBUG
	printf("\nMaster Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFGM(addr));
	printf("Block  0 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG0(addr));
	printf("Block  1 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG1(addr));
	printf("Block  2 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG2(addr));
	printf("Block  3 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG3(addr));
	printf("Block  4 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG4(addr));
	printf("Block  5 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG5(addr));
	printf("Block  6 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG6(addr));
	printf("Block  7 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG7(addr));
	printf("Block  8 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG8(addr));
	printf("Block  9 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG9(addr));
	printf("Block 10 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG10(addr));
	printf("Block 11 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG11(addr));
	printf("Block 12 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG12(addr));
	printf("Block 13 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG13(addr));
	printf("Block 14 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG14(addr));
	printf("Block 15 Lock Config = 0x%08lx\n", *C302F_BNK_ADDR_CFG15(addr));
#endif

	/* reset the flash again */
	*addr = C302F_BNK_CMD_RST;

	return 0;
}

/*
 * probe for Cogent CMA302 flash module at address "base" and store
 * info for any found into flash_info entry "fip". Must find at least
 * one bank.
 */
static void
c302f_probe(flash_info_t *fip, c302f_addr_t base)
{
	c302f_addr_t addr, eaddr;
	int nbanks;

	fip->size = 0L;
	fip->sector_count = 0;

	addr = base;
	eaddr = C302F_BNK_ADDR_BASE(addr, C302F_MAX_BANKS);
	nbanks = 0;

	while (addr < eaddr) {
		c302f_addr_t addrw, eaddrw, addrb;
		int i, osc, nsc;

		addrw = addr;
		eaddrw = C302F_BNK_ADDR_NEXT_WORD(addrw);

		while (addrw < eaddrw)
			if (c302f_probe_word(addrw++) != 0)
				goto out;

		/* bank exists - append info for this bank to *fip */
		fip->flash_id = FLASH_MAN_INTEL|FLASH_28F008S5;
		fip->size += C302F_BNK_SIZE;
		osc = fip->sector_count;
		fip->sector_count += C302F_BNK_NBLOCKS;
		if ((nsc = fip->sector_count) >= CFG_MAX_FLASH_SECT)
			panic("Too many sectors in flash at address 0x%08lx\n",
				(unsigned long)base);

		addrb = addr;
		for (i = osc; i < nsc; i++) {
			fip->start[i] = (ulong)addrb;
			fip->protect[i] = 0;
			addrb = C302F_BNK_ADDR_NEXT_BLK(addrb);
		}

		addr = C302F_BNK_ADDR_NEXT_BNK(addr);
		nbanks++;
	}

out:
	if (nbanks == 0)
		panic("ERROR: no flash found at address 0x%08lx\n",
			(unsigned long)base);
}

static void
c302f_reset(flash_info_t *info, int sect)
{
	c302f_addr_t addrw, eaddrw;

	addrw = (c302f_addr_t)info->start[sect];
	eaddrw = C302F_BNK_ADDR_NEXT_WORD(addrw);

	while (addrw < eaddrw) {
#ifdef FLASH_DEBUG
		printf("  writing reset cmd to addr 0x%08lx\n",
			(unsigned long)addrw);
#endif
		*addrw = C302F_BNK_CMD_RST;
		addrw++;
	}
}

static void
c302f_erase_init(flash_info_t *info, int sect)
{
	c302f_addr_t addrw, saddrw, eaddrw;
	int flag;

#ifdef FLASH_DEBUG
	printf("0x%08lx C302F_BNK_CMD_PROG\n", C302F_BNK_CMD_PROG);
	printf("0x%08lx C302F_BNK_CMD_ERASE1\n", C302F_BNK_CMD_ERASE1);
	printf("0x%08lx C302F_BNK_CMD_ERASE2\n", C302F_BNK_CMD_ERASE2);
	printf("0x%08lx C302F_BNK_CMD_CLR_STAT\n", C302F_BNK_CMD_CLR_STAT);
	printf("0x%08lx C302F_BNK_CMD_RST\n", C302F_BNK_CMD_RST);
	printf("0x%08lx C302F_BNK_STAT_RDY\n", C302F_BNK_STAT_RDY);
	printf("0x%08lx C302F_BNK_STAT_ERR\n", C302F_BNK_STAT_ERR);
#endif

	saddrw = (c302f_addr_t)info->start[sect];
	eaddrw = C302F_BNK_ADDR_NEXT_WORD(saddrw);

#ifdef FLASH_DEBUG
	printf("erasing sector %d, start addr = 0x%08lx "
		"(bank next word addr = 0x%08lx)\n", sect,
		(unsigned long)saddrw, (unsigned long)eaddrw);
#endif

	/* Disable intrs which might cause a timeout here */
	flag = disable_interrupts();

	for (addrw = saddrw; addrw < eaddrw; addrw++) {
#ifdef FLASH_DEBUG
		printf("  writing erase cmd to addr 0x%08lx\n",
			(unsigned long)addrw);
#endif
		*addrw = C302F_BNK_CMD_ERASE1;
		*addrw = C302F_BNK_CMD_ERASE2;
	}

	/* re-enable interrupts if necessary */
	if (flag)
		enable_interrupts();
}

static int
c302f_erase_poll(flash_info_t *info, int sect)
{
	c302f_addr_t addrw, saddrw, eaddrw;
	int sectdone, haderr;

	saddrw = (c302f_addr_t)info->start[sect];
	eaddrw = C302F_BNK_ADDR_NEXT_WORD(saddrw);

	sectdone = 1;
	haderr = 0;

	for (addrw = saddrw; addrw < eaddrw; addrw++) {
		c302f_word_t stat = *addrw;

#ifdef FLASH_DEBUG
		printf("  checking status at addr "
			"0x%08lx [0x%08lx]\n",
			(unsigned long)addrw, stat);
#endif
		if ((stat & C302F_BNK_STAT_RDY) != C302F_BNK_STAT_RDY)
			sectdone = 0;
		else if ((stat & C302F_BNK_STAT_ERR) != 0) {
			printf(" failed on sector %d "
				"(stat = 0x%08lx) at "
				"address 0x%08lx\n",
				sect, stat,
				(unsigned long)addrw);
			*addrw = C302F_BNK_CMD_CLR_STAT;
			haderr = 1;
		}
	}

	if (haderr)
		return (-1);
	else
		return (sectdone);
}

static int
c302f_write_word(c302f_addr_t addr, c302f_word_t value)
{
	c302f_word_t stat;
	ulong start;
	int flag, retval;

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	*addr = C302F_BNK_CMD_PROG;

	*addr = value;

	/* re-enable interrupts if necessary */
	if (flag)
		enable_interrupts();

	retval = 0;

	/* data polling for D7 */
	start = get_timer (0);
	do {
		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
			retval = 1;
			goto done;
		}
		stat = *addr;
	} while ((stat & C302F_BNK_STAT_RDY) != C302F_BNK_STAT_RDY);

	if ((stat & C302F_BNK_STAT_ERR) != 0) {
		printf("flash program failed (stat = 0x%08lx) "
			"at address 0x%08lx\n", (ulong)stat, (ulong)addr);
		*addr = C302F_BNK_CMD_CLR_STAT;
		retval = 3;
	}

done:
	/* reset to read mode */
	*addr = C302F_BNK_CMD_RST;

	return (retval);
}

#endif	/* CONFIG_CMA302 */

unsigned long
flash_init(void)
{
	unsigned long total;
	int i;
	flash_info_t *fip;

	/* Init: no FLASHes known */
	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_UNKNOWN;
	}

	fip = &flash_info[0];
	total = 0L;

#if defined(CONFIG_CMA302)
	c302f_probe(fip, (c302f_addr_t)CFG_FLASH_BASE);
	total += fip->size;
	fip++;
#endif

#if (CMA_MB_CAPS & CMA_MB_CAP_FLASH)
	/* not yet ...
	cmbf_probe(fip, (cmbf_addr_t)CMA_MB_FLASH_BASE);
	total += fip->size;
	fip++;
	*/
#endif

	/*
	 * protect monitor and environment sectors
	 */

#if CFG_MONITOR_BASE == CFG_FLASH_BASE
	(void)flash_protect(FLAG_PROTECT_SET,
		      CFG_MONITOR_BASE,
		      CFG_MONITOR_BASE+CFG_MONITOR_LEN-1,
		      &flash_info[0]);
#endif

#if defined(CFG_FLASH_ENV_ADDR)
	(void)flash_protect(FLAG_PROTECT_SET,
		      CFG_FLASH_ENV_ADDR,
#if defined(CFG_FLASH_ENV_BUF)
		      CFG_FLASH_ENV_ADDR + CFG_FLASH_ENV_BUF - 1,
#else
		      CFG_FLASH_ENV_ADDR + CFG_FLASH_ENV_SIZE - 1,
#endif
		      &flash_info[0]);
#endif

	return total;
}

/*-----------------------------------------------------------------------
 * Check or set protection status for monitor sectors
 *
 * The monitor always occupies the _first_ part of the _first_ Flash bank.
 */
static int
flash_protect(int flag, ulong from, ulong to, flash_info_t *info)
{
	ulong b_end = info->start[0] + info->size - 1;	/* bank end address */
	int rc    =  0;
	int first = -1;
	int last  = -1;
	int i;

	if (to < info->start[0]) {
		return (0);
	}

	for (i=0; i<info->sector_count; ++i) {
		ulong end;		/* last address in current sect	*/
		short s_end;

		s_end = info->sector_count - 1;

		end = (i == s_end) ? b_end : info->start[i + 1] - 1;

		if (from > end) {
			continue;
		}
		if (to < info->start[i]) {
			continue;
		}

		if (from == info->start[i]) {
			first = i;
			if (last < 0) {
				last = s_end;
			}
		}
		if (to  == end) {
			last  = i;
			if (first < 0) {
				first = 0;
			}
		}
	}

	for (i=first; i<=last; ++i) {
		if (flag & FLAG_PROTECT_CLEAR) {