cfi_util.c 6.4 KB
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/*
 * Common Flash Interface support:
 *   Generic utility functions not dependant on command set
 *
 * Copyright (C) 2002 Red Hat
 * Copyright (C) 2003 STMicroelectronics Limited
 *
 * This code is covered by the GPL.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <asm/byteorder.h>

#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/mtd/xip.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/cfi.h>
#include <linux/mtd/compatmac.h>

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int __xipram cfi_qry_present(struct map_info *map, __u32 base,
			     struct cfi_private *cfi)
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{
	int osf = cfi->interleave * cfi->device_type;	/* scale factor */
	map_word val[3];
	map_word qry[3];

	qry[0] = cfi_build_cmd('Q', map, cfi);
	qry[1] = cfi_build_cmd('R', map, cfi);
	qry[2] = cfi_build_cmd('Y', map, cfi);

	val[0] = map_read(map, base + osf*0x10);
	val[1] = map_read(map, base + osf*0x11);
	val[2] = map_read(map, base + osf*0x12);

	if (!map_word_equal(map, qry[0], val[0]))
		return 0;

	if (!map_word_equal(map, qry[1], val[1]))
		return 0;

	if (!map_word_equal(map, qry[2], val[2]))
		return 0;

	return 1; 	/* "QRY" found */
}
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EXPORT_SYMBOL_GPL(cfi_qry_present);
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int __xipram cfi_qry_mode_on(uint32_t base, struct map_info *map,
			     struct cfi_private *cfi)
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{
	cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
	cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
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	if (cfi_qry_present(map, base, cfi))
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		return 1;
	/* QRY not found probably we deal with some odd CFI chips */
	/* Some revisions of some old Intel chips? */
	cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
	cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
	cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
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	if (cfi_qry_present(map, base, cfi))
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		return 1;
	/* ST M29DW chips */
	cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
	cfi_send_gen_cmd(0x98, 0x555, base, map, cfi, cfi->device_type, NULL);
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	if (cfi_qry_present(map, base, cfi))
		return 1;
	/* some old SST chips, e.g. 39VF160x/39VF320x */
	cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
	cfi_send_gen_cmd(0xAA, 0x5555, base, map, cfi, cfi->device_type, NULL);
	cfi_send_gen_cmd(0x55, 0x2AAA, base, map, cfi, cfi->device_type, NULL);
	cfi_send_gen_cmd(0x98, 0x5555, base, map, cfi, cfi->device_type, NULL);
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	if (cfi_qry_present(map, base, cfi))
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		return 1;
	/* QRY not found */
	return 0;
}
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EXPORT_SYMBOL_GPL(cfi_qry_mode_on);

void __xipram cfi_qry_mode_off(uint32_t base, struct map_info *map,
			       struct cfi_private *cfi)
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{
	cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
	cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
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	/* M29W128G flashes require an additional reset command
	   when exit qry mode */
	if ((cfi->mfr == CFI_MFR_ST) && (cfi->id == 0x227E || cfi->id == 0x7E))
		cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
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}
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EXPORT_SYMBOL_GPL(cfi_qry_mode_off);
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struct cfi_extquery *
__xipram cfi_read_pri(struct map_info *map, __u16 adr, __u16 size, const char* name)
{
	struct cfi_private *cfi = map->fldrv_priv;
	__u32 base = 0; // cfi->chips[0].start;
	int ofs_factor = cfi->interleave * cfi->device_type;
	int i;
	struct cfi_extquery *extp = NULL;

	if (!adr)
		goto out;

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	printk(KERN_INFO "%s Extended Query Table at 0x%4.4X\n", name, adr);

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	extp = kmalloc(size, GFP_KERNEL);
	if (!extp) {
		printk(KERN_ERR "Failed to allocate memory\n");
		goto out;
	}

#ifdef CONFIG_MTD_XIP
	local_irq_disable();
#endif

	/* Switch it into Query Mode */
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	cfi_qry_mode_on(base, map, cfi);
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	/* Read in the Extended Query Table */
	for (i=0; i<size; i++) {
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		((unsigned char *)extp)[i] =
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			cfi_read_query(map, base+((adr+i)*ofs_factor));
	}

	/* Make sure it returns to read mode */
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	cfi_qry_mode_off(base, map, cfi);
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#ifdef CONFIG_MTD_XIP
	(void) map_read(map, base);
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	xip_iprefetch();
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	local_irq_enable();
#endif

 out:	return extp;
}

EXPORT_SYMBOL(cfi_read_pri);

void cfi_fixup(struct mtd_info *mtd, struct cfi_fixup *fixups)
{
	struct map_info *map = mtd->priv;
	struct cfi_private *cfi = map->fldrv_priv;
	struct cfi_fixup *f;

	for (f=fixups; f->fixup; f++) {
		if (((f->mfr == CFI_MFR_ANY) || (f->mfr == cfi->mfr)) &&
		    ((f->id  == CFI_ID_ANY)  || (f->id  == cfi->id))) {
			f->fixup(mtd, f->param);
		}
	}
}

EXPORT_SYMBOL(cfi_fixup);

int cfi_varsize_frob(struct mtd_info *mtd, varsize_frob_t frob,
				     loff_t ofs, size_t len, void *thunk)
{
	struct map_info *map = mtd->priv;
	struct cfi_private *cfi = map->fldrv_priv;
	unsigned long adr;
	int chipnum, ret = 0;
	int i, first;
	struct mtd_erase_region_info *regions = mtd->eraseregions;

	if (ofs > mtd->size)
		return -EINVAL;

	if ((len + ofs) > mtd->size)
		return -EINVAL;

	/* Check that both start and end of the requested erase are
	 * aligned with the erasesize at the appropriate addresses.
	 */

	i = 0;

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	/* Skip all erase regions which are ended before the start of
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	   the requested erase. Actually, to save on the calculations,
	   we skip to the first erase region which starts after the
	   start of the requested erase, and then go back one.
	*/
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	while (i < mtd->numeraseregions && ofs >= regions[i].offset)
	       i++;
	i--;

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	/* OK, now i is pointing at the erase region in which this
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	   erase request starts. Check the start of the requested
	   erase range is aligned with the erase size which is in
	   effect here.
	*/

	if (ofs & (regions[i].erasesize-1))
		return -EINVAL;

	/* Remember the erase region we start on */
	first = i;

	/* Next, check that the end of the requested erase is aligned
	 * with the erase region at that address.
	 */

	while (i<mtd->numeraseregions && (ofs + len) >= regions[i].offset)
		i++;

	/* As before, drop back one to point at the region in which
	   the address actually falls
	*/
	i--;
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	if ((ofs + len) & (regions[i].erasesize-1))
		return -EINVAL;

	chipnum = ofs >> cfi->chipshift;
	adr = ofs - (chipnum << cfi->chipshift);

	i=first;

	while(len) {
		int size = regions[i].erasesize;

		ret = (*frob)(map, &cfi->chips[chipnum], adr, size, thunk);
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		if (ret)
			return ret;

		adr += size;
		ofs += size;
		len -= size;

		if (ofs == regions[i].offset + size * regions[i].numblocks)
			i++;

		if (adr >> cfi->chipshift) {
			adr = 0;
			chipnum++;
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			if (chipnum >= cfi->numchips)
			break;
		}
	}

	return 0;
}

EXPORT_SYMBOL(cfi_varsize_frob);

MODULE_LICENSE("GPL");