flash.c

uboot在arm处理器s3c2410的移植代码

/*
 * board/eva/flash.c
 *
 * (C) Copyright 2002
 * Sangmoon Kim, Etin Systems, [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 <common.h>
#include <asm/processor.h>
#include <asm/pci_io.h>
#include <mpc824x.h>

int (*do_flash_erase)(flash_info_t*, uint32_t, uint32_t);
int (*write_dword)(flash_info_t*, ulong, uint64_t);

typedef uint64_t cfi_word;

#define cfi_read(flash, addr) *((volatile cfi_word*)(flash->start[0] + addr))

#define cfi_write(flash, val, addr) \
	move64((cfi_word*)&val, \
			(cfi_word*)(flash->start[0] + addr))

#define CMD(x) ((((cfi_word)x)<<48)|(((cfi_word)x)<<32)|(((cfi_word)x)<<16)|(((cfi_word)x)))

static void write32(unsigned long addr, uint32_t value)
{
	*(volatile uint32_t*)(addr) = value;
	asm volatile("sync");
}

static uint32_t read32(unsigned long addr)
{
	uint32_t value;
	value = *(volatile uint32_t*)addr;
	asm volatile("sync");
	return value;
}

static cfi_word cfi_cmd(flash_info_t *flash, uint8_t cmd, uint32_t addr)
{
	uint32_t base = flash->start[0];
	uint32_t val=(cmd << 16) | cmd;
	addr <<= 3;
	write32(base + addr, val);
	return addr;
}

static uint16_t cfi_read_query(flash_info_t *flash, uint32_t addr)
{
	uint32_t base = flash->start[0];
	addr <<= 3;
	return (uint16_t)read32(base + addr);
}

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

static void move64(uint64_t *src, uint64_t *dest)
{
	asm volatile("lfd  0, 0(3)\n\t" /* fpr0   =  *scr       */
	 "stfd 0, 0(4)"         /* *dest  =  fpr0       */
	 : : : "fr0" );         /* Clobbers fr0         */
	return;
}

static int cfi_write_dword(flash_info_t *flash, ulong dest, cfi_word data)
{
	unsigned long start;
	cfi_word status = 0;

	status = cfi_read(flash, dest);
	data &= status;

	cfi_cmd(flash, 0x40, 0);
	cfi_write(flash, data, dest);

	udelay(10);
	start = get_timer (0);
	for(;;) {
		status = cfi_read(flash, dest);
		status &= CMD(0x80);
		if(status == CMD(0x80))
			break;
		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
			cfi_cmd(flash, 0xff, 0);
			return 1;
		}
		udelay(1);
	}
	cfi_cmd(flash, 0xff, 0);

	return 0;
}

static int jedec_write_dword (flash_info_t *flash, ulong dest, cfi_word data)
{
	ulong start;
	cfi_word status = 0;

	status = cfi_read(flash, dest);
	if(status != CMD(0xffff)) return 2;

	cfi_cmd(flash, 0xaa, 0x555);
	cfi_cmd(flash, 0x55, 0x2aa);
	cfi_cmd(flash, 0xa0, 0x555);

	cfi_write(flash, data, dest);

	udelay(10);
	start = get_timer (0);
	status = ~data;
	while(status != data) {
		if (get_timer(start) > CFG_FLASH_WRITE_TOUT)
			return 1;
		status = cfi_read(flash, dest);
		udelay(1);
	}
	return 0;
}

static __inline__ unsigned long get_msr(void)
{
	unsigned long msr;
	__asm__ __volatile__ ("mfmsr %0" : "=r" (msr) :);
	return msr;
}

static __inline__ void set_msr(unsigned long msr)
{
	__asm__ __volatile__ ("mtmsr %0" : : "r" (msr));
}

int write_buff (flash_info_t *flash, uchar *src, ulong addr, ulong cnt)
{
	ulong wp;
	int i, s, l, rc;
	cfi_word data;
	uint8_t *t = (uint8_t*)&data;
	unsigned long base = flash->start[0];
	uint32_t msr;

	if (flash->flash_id == FLASH_UNKNOWN)
		return 4;

	if (cnt == 0)
		return 0;

	addr -= base;

	msr = get_msr();
	set_msr(msr|MSR_FP);

	wp = (addr & ~7);   /* get lower word aligned address */

	if((addr-wp) != 0) {
		data = cfi_read(flash, wp);
		s = addr & 7;
		l = ( cnt < (8-s) ) ? cnt : (8-s);
		for(i = 0; i < l; i++)
			t[s+i] = *src++;
		if ((rc = write_dword(flash, wp, data)) != 0)
			goto DONE;
		wp += 8;
		cnt -= l;
	}

	while (cnt >= 8) {
		for (i = 0; i < 8; i++)
			t[i] = *src++;
		if ((rc = write_dword(flash, wp, data)) != 0)
			goto DONE;
		wp  += 8;
		cnt -= 8;
	}

	if (cnt == 0) {
		rc = 0;
		goto DONE;
	}

	data = cfi_read(flash, wp);
	for(i = 0; i < cnt; i++)
		t[i] = *src++;
	rc = write_dword(flash, wp, data);
DONE:
	set_msr(msr);
	return rc;
}

static int cfi_erase_oneblock(flash_info_t *flash, uint32_t sect)
{
	int sa;
	int flag;
	ulong start, last, now;
	cfi_word status;

	flag = disable_interrupts();

	sa = (flash->start[sect] - flash->start[0]);
	write32(flash->start[sect], 0x00200020);
	write32(flash->start[sect], 0x00d000d0);

	if (flag)
		enable_interrupts();

	udelay(1000);
	start = get_timer (0);
	last  = start;

	for (;;) {
		status = cfi_read(flash, sa);
		status &= CMD(0x80);
		if (status == CMD(0x80))
			break;
		if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
			cfi_cmd(flash, 0xff, 0);
			printf ("Timeout\n");
			return ERR_TIMOUT;
		}

		if ((now - last) > 1000) {
			serial_putc ('.');
			last = now;
		}
		udelay(10);
	}
	cfi_cmd(flash, 0xff, 0);
	return ERR_OK;
}

static int cfi_erase(flash_info_t *flash, uint32_t s_first, uint32_t s_last)
{
	int sect;
	int rc = ERR_OK;

	for (sect = s_first; sect <= s_last; sect++) {
		if (flash->protect[sect] == 0) {
			rc = cfi_erase_oneblock(flash, sect);
			if (rc != ERR_OK) break;
		}
	}
	printf (" done\n");
	return rc;
}

static int jedec_erase(flash_info_t *flash, uint32_t s_first, uint32_t s_last)
{
	int sect;
	cfi_word status;
	int sa = -1;
	int flag;
	ulong start, last, now;

	flag = disable_interrupts();

	cfi_cmd(flash, 0xaa, 0x555);
	cfi_cmd(flash, 0x55, 0x2aa);
	cfi_cmd(flash, 0x80, 0x555);
	cfi_cmd(flash, 0xaa, 0x555);
	cfi_cmd(flash, 0x55, 0x2aa);
	for ( sect = s_first; sect <= s_last; sect++) {
		if (flash->protect[sect] == 0) {
			sa = flash->start[sect] - flash->start[0];
			write32(flash->start[sect], 0x00300030);
		}
	}
	if (flag)
		enable_interrupts();

	if (sa < 0)
		goto DONE;

	udelay (1000);
	start = get_timer (0);
	last  = start;
	for(;;) {
		status = cfi_read(flash, sa);
		if (status == CMD(0xffff))
			break;

		if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
			printf ("Timeout\n");
			return ERR_TIMOUT;
		}

		if ((now - last) > 1000) {
			serial_putc ('.');
			last = now;
		}
		udelay(10);
	}
DONE:
	cfi_cmd(flash, 0xf0, 0);

	printf (" done\n");

	return ERR_OK;
}

int flash_erase (flash_info_t *flash, int s_first, int s_last)
{
	int sect;
	int prot;

	if ((s_first < 0) || (s_first > s_last)) {
		if (flash->flash_id == FLASH_UNKNOWN)
			printf ("- missing\n");
		else
			printf ("- no sectors to erase\n");
		return ERR_NOT_ERASED;
	}
	if (flash->flash_id == FLASH_UNKNOWN) {
		printf ("Can't erase unknown flash type - aborted\n");
		return ERR_NOT_ERASED;
	}

	prot = 0;
	for (sect = s_first; sect <= s_last; sect++)
		if (flash->protect[sect]) prot++;

	if (prot)
		printf ("- Warning: %d protected sectors will not be erased!\n",
					                        prot);
	else
		printf ("\n");

	return do_flash_erase(flash, s_first, s_last);
}

struct jedec_flash_info {
	const uint16_t mfr_id;
	const uint16_t dev_id;
	const char *name;
	const int DevSize;
	const int InterfaceDesc;
	const int NumEraseRegions;
	const ulong regions[4];
};

#define ERASEINFO(size,blocks) (size<<8)|(blocks-1)

#define SIZE_1MiB 20
#define SIZE_2MiB 21