patch-2.4.6 linux/drivers/mtd/chips/cfi_cmdset_0002.c

• Lines: 937
• Date: Tue Jun 12 10:30:27 2001
• Orig file: v2.4.5/linux/drivers/mtd/chips/cfi_cmdset_0002.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/mtd/chips/cfi_cmdset_0002.c linux/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -0,0 +1,936 @@
+/*
+ * Common Flash Interface support:
+ *   AMD & Fujitsu Standard Vendor Command Set (ID 0x0002)
+ *
+ * Copyright (C) 2000 Crossnet Co. <info@crossnet.co.jp>
+ *
+ * 2_by_8 routines added by Simon Munton
+ *
+ * This code is GPL
+ *
+ * $Id: cfi_cmdset_0002.c,v 1.48 2001/06/03 01:32:57 nico Exp $
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <asm/io.h>
+#include <asm/byteorder.h>
+
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/cfi.h>
+
+#define AMD_BOOTLOC_BUG
+
+static int cfi_amdstd_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
+static int cfi_amdstd_write(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
+static int cfi_amdstd_erase_onesize(struct mtd_info *, struct erase_info *);
+static int cfi_amdstd_erase_varsize(struct mtd_info *, struct erase_info *);
+static void cfi_amdstd_sync (struct mtd_info *);
+static int cfi_amdstd_suspend (struct mtd_info *);
+static void cfi_amdstd_resume (struct mtd_info *);
+
+static void cfi_amdstd_destroy(struct mtd_info *);
+
+void cfi_cmdset_0002(struct map_info *, int, unsigned long);
+static struct mtd_info *cfi_amdstd_setup (struct map_info *);
+
+
+static struct mtd_chip_driver cfi_amdstd_chipdrv = {
+	probe: cfi_amdstd_setup,
+	destroy: cfi_amdstd_destroy,
+	name: "cfi_cmdset_0002",
+	module: THIS_MODULE
+};
+
+void cfi_cmdset_0002(struct map_info *map, int primary, unsigned long base)
+{
+	struct cfi_private *cfi = map->fldrv_priv;
+	unsigned char bootloc;
+	int ofs_factor = cfi->interleave * cfi->device_type;
+	int i;
+	__u8 major, minor;
+//	struct cfi_pri_intelext *extp;
+
+    if (cfi->cfi_mode==0){
+	__u16 adr = primary?cfi->cfiq->P_ADR:cfi->cfiq->A_ADR;
+
+	cfi_send_gen_cmd(0x98, 0x55, 0, map, cfi, cfi->device_type, NULL);
+
+	major = cfi_read_query(map, (adr+3)*ofs_factor);
+	minor = cfi_read_query(map, (adr+4)*ofs_factor);
+
+	printk(" Amd/Fujitsu Extended Query Table v%c.%c at 0x%4.4X\n",
+	       major, minor, adr);
+
+	cfi_send_gen_cmd(0xf0, 0x55, 0, map, cfi, cfi->device_type, NULL);
+
+	cfi_send_gen_cmd(0xaa, 0x555, base, map, cfi, cfi->device_type, NULL);
+	cfi_send_gen_cmd(0x55, 0x2aa, base, map, cfi, cfi->device_type, NULL);
+	cfi_send_gen_cmd(0x90, 0x555, base, map, cfi, cfi->device_type, NULL);
+	cfi->mfr = cfi_read_query(map, base);
+	cfi->id = cfi_read_query(map, base + ofs_factor);
+
+	/* Wheee. Bring me the head of someone at AMD. */
+#ifdef AMD_BOOTLOC_BUG
+	if (((major << 8) | minor) < 0x3131) {
+		/* CFI version 1.0 => don't trust bootloc */
+		if (cfi->id & 0x80) {
+			printk(KERN_WARNING "%s: JEDEC Device ID is 0x%02X. Assuming broken CFI table.\n", map->name, cfi->id);
+			bootloc = 3;	/* top boot */
+		} else {
+			bootloc = 2;	/* bottom boot */
+		}
+	} else
+#endif
+	{
+		cfi_send_gen_cmd(0x98, 0x55, 0, map, cfi, cfi->device_type, NULL);
+		bootloc = cfi_read_query(map, (adr+15)*ofs_factor);
+	}
+	if (bootloc == 3 && cfi->cfiq->NumEraseRegions > 1) {
+		printk(KERN_WARNING "%s: Swapping erase regions for broken CFI table.\n", map->name);
+
+		for (i=0; i<cfi->cfiq->NumEraseRegions / 2; i++) {
+			int j = (cfi->cfiq->NumEraseRegions-1)-i;
+			__u32 swap;
+
+			swap = cfi->cfiq->EraseRegionInfo[i];
+			cfi->cfiq->EraseRegionInfo[i] = cfi->cfiq->EraseRegionInfo[j];
+			cfi->cfiq->EraseRegionInfo[j] = swap;
+		}
+	}
+    }
+
+    /* If there was an old setup function, decrease its use count */
+    if (map->fldrv)
+      if(map->fldrv->module)
+	__MOD_DEC_USE_COUNT(map->fldrv->module);
+    
+    if (cfi->cmdset_priv)
+		kfree(cfi->cmdset_priv);
+
+    for (i=0; i< cfi->numchips; i++) {
+		cfi->chips[i].word_write_time = 1<<cfi->cfiq->WordWriteTimeoutTyp;
+		cfi->chips[i].buffer_write_time = 1<<cfi->cfiq->BufWriteTimeoutTyp;
+		cfi->chips[i].erase_time = 1<<cfi->cfiq->BlockEraseTimeoutTyp;
+    }		
+
+    map->fldrv = &cfi_amdstd_chipdrv;
+    MOD_INC_USE_COUNT;
+    cfi_send_gen_cmd(0xf0, 0x55, 0, map, cfi, cfi->device_type, NULL);
+    return;
+}
+
+static struct mtd_info *cfi_amdstd_setup(struct map_info *map)
+{
+	struct cfi_private *cfi = map->fldrv_priv;
+	struct mtd_info *mtd;
+	unsigned long devsize = (1<<cfi->cfiq->DevSize) * cfi->interleave;
+
+	mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
+	printk("number of %s chips: %d\n", (cfi->cfi_mode)?"JEDEC":"CFI",cfi->numchips);
+
+	if (!mtd) {
+	  printk("Failed to allocate memory for MTD device\n");
+	  kfree(cfi->cmdset_priv);
+	  return NULL;
+	}
+
+	memset(mtd, 0, sizeof(*mtd));
+	mtd->priv = map;
+	mtd->type = MTD_NORFLASH;
+	/* Also select the correct geometry setup too */ 
+	mtd->size = devsize * cfi->numchips;
+	
+	if (cfi->cfiq->NumEraseRegions == 1) {
+		/* No need to muck about with multiple erase sizes */
+		mtd->erasesize = ((cfi->cfiq->EraseRegionInfo[0] >> 8) & ~0xff) * cfi->interleave;
+	} else {
+		unsigned long offset = 0;
+		int i,j;
+
+		mtd->numeraseregions = cfi->cfiq->NumEraseRegions * cfi->numchips;
+		mtd->eraseregions = kmalloc(sizeof(struct mtd_erase_region_info) * mtd->numeraseregions, GFP_KERNEL);
+		if (!mtd->eraseregions) { 
+			printk("Failed to allocate memory for MTD erase region info\n");
+			kfree(cfi->cmdset_priv);
+			return NULL;
+		}
+			
+		for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
+			unsigned long ernum, ersize;
+			ersize = ((cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff) * cfi->interleave;
+			ernum = (cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1;
+			
+			if (mtd->erasesize < ersize) {
+				mtd->erasesize = ersize;
+			}
+			for (j=0; j<cfi->numchips; j++) {
+				mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].offset = (j*devsize)+offset;
+				mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].erasesize = ersize;
+				mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].numblocks = ernum;
+			}
+			offset += (ersize * ernum);
+		}
+		if (offset != devsize) {
+			/* Argh */
+			printk("Sum of regions (%lx) != total size of set of interleaved chips (%lx)\n", offset, devsize);
+			kfree(mtd->eraseregions);
+			kfree(cfi->cmdset_priv);
+			return NULL;
+		}
+		// debug
+		for (i=0; i<mtd->numeraseregions;i++){
+			printk("%d: offset=0x%x,size=0x%x,blocks=%d\n",
+			       i,mtd->eraseregions[i].offset,
+			       mtd->eraseregions[i].erasesize,
+			       mtd->eraseregions[i].numblocks);
+		}
+	}
+
+	switch (CFIDEV_BUSWIDTH)
+	{
+	case 1:
+	case 2:
+	case 4:
+#if 1
+		if (mtd->numeraseregions > 1)
+			mtd->erase = cfi_amdstd_erase_varsize;
+		else
+#endif
+			mtd->erase = cfi_amdstd_erase_onesize;
+		mtd->read = cfi_amdstd_read;
+		mtd->write = cfi_amdstd_write;
+		break;
+
+	default:
+	        printk("Unsupported buswidth\n");
+		kfree(mtd);
+		kfree(cfi->cmdset_priv);
+		return NULL;
+		break;
+	}
+	mtd->sync = cfi_amdstd_sync;
+	mtd->suspend = cfi_amdstd_suspend;
+	mtd->resume = cfi_amdstd_resume;
+	mtd->flags = MTD_CAP_NORFLASH;
+	map->fldrv = &cfi_amdstd_chipdrv;
+	mtd->name = map->name;
+	MOD_INC_USE_COUNT;
+	return mtd;
+}
+
+static inline int do_read_onechip(struct map_info *map, struct flchip *chip, loff_t adr, size_t len, u_char *buf)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	unsigned long timeo = jiffies + HZ;
+
+ retry:
+	cfi_spin_lock(chip->mutex);
+
+	if (chip->state != FL_READY){
+	        printk("Waiting for chip to read, status = %d\n", chip->state);
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		add_wait_queue(&chip->wq, &wait);
+                
+		cfi_spin_unlock(chip->mutex);
+
+		schedule();
+		remove_wait_queue(&chip->wq, &wait);
+#if 0
+		if(signal_pending(current))
+			return -EINTR;
+#endif
+		timeo = jiffies + HZ;
+
+		goto retry;
+	}	
+
+	adr += chip->start;
+
+	chip->state = FL_READY;
+
+	map->copy_from(map, buf, adr, len);
+
+	wake_up(&chip->wq);
+	cfi_spin_unlock(chip->mutex);
+
+	return 0;
+}
+
+static int cfi_amdstd_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
+{
+	struct map_info *map = mtd->priv;
+	struct cfi_private *cfi = map->fldrv_priv;
+	unsigned long ofs;
+	int chipnum;
+	int ret = 0;
+
+	/* ofs: offset within the first chip that the first read should start */
+
+	chipnum = (from >> cfi->chipshift);
+	ofs = from - (chipnum <<  cfi->chipshift);
+
+
+	*retlen = 0;
+
+	while (len) {
+		unsigned long thislen;
+
+		if (chipnum >= cfi->numchips)
+			break;
+
+		if ((len + ofs -1) >> cfi->chipshift)
+			thislen = (1<<cfi->chipshift) - ofs;
+		else
+			thislen = len;
+
+		ret = do_read_onechip(map, &cfi->chips[chipnum], ofs, thislen, buf);
+		if (ret)
+			break;
+
+		*retlen += thislen;
+		len -= thislen;
+		buf += thislen;
+
+		ofs = 0;
+		chipnum++;
+	}
+	return ret;
+}
+
+static int do_write_oneword(struct map_info *map, struct flchip *chip, unsigned long adr, __u32 datum, int fast)
+{
+	unsigned long timeo = jiffies + HZ;
+	unsigned int Last[4];
+	unsigned long Count = 0;
+	struct cfi_private *cfi = map->fldrv_priv;
+	DECLARE_WAITQUEUE(wait, current);
+	int ret = 0;
+
+ retry:
+	cfi_spin_lock(chip->mutex);
+
+	if (chip->state != FL_READY){
+	        printk("Waiting for chip to write, status = %d\n", chip->state);
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		add_wait_queue(&chip->wq, &wait);
+                
+		cfi_spin_unlock(chip->mutex);
+
+		schedule();
+		remove_wait_queue(&chip->wq, &wait);
+		printk("Wake up to write:\n");
+#if 0
+		if(signal_pending(current))
+			return -EINTR;
+#endif
+		timeo = jiffies + HZ;
+
+		goto retry;
+	}	
+
+	chip->state = FL_WRITING;
+
+	adr += chip->start;
+	ENABLE_VPP(map);
+	if (fast) { /* Unlock bypass */
+		cfi_send_gen_cmd(0xA0, 0, chip->start, map, cfi, cfi->device_type, NULL);
+	}
+	else {
+	        cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, CFI_DEVICETYPE_X8, NULL);
+	        cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, CFI_DEVICETYPE_X8, NULL);
+	        cfi_send_gen_cmd(0xA0, cfi->addr_unlock1, chip->start, map, cfi, CFI_DEVICETYPE_X8, NULL);
+	}
+
+	cfi_write(map, datum, adr);
+
+	cfi_spin_unlock(chip->mutex);
+	cfi_udelay(chip->word_write_time);
+	cfi_spin_lock(chip->mutex);
+
+	Last[0] = cfi_read(map, adr);
+	//	printk("Last[0] is %x\n", Last[0]);
+	Last[1] = cfi_read(map, adr);
+	//	printk("Last[1] is %x\n", Last[1]);
+	Last[2] = cfi_read(map, adr);
+	//	printk("Last[2] is %x\n", Last[2]);
+
+	for (Count = 3; Last[(Count - 1) % 4] != Last[(Count - 2) % 4] && Count < 10000; Count++){
+		cfi_spin_unlock(chip->mutex);
+		cfi_udelay(10);
+		cfi_spin_lock(chip->mutex);
+		
+	        Last[Count % 4] = cfi_read(map, adr);
+		//		printk("Last[%d%%4] is %x\n", Count, Last[Count%4]);
+	}
+	
+	if (Last[(Count - 1) % 4] != datum){
+		printk("Last[%ld] is %x, datum is %x\n",(Count - 1) % 4,Last[(Count - 1) % 4],datum);
+	        cfi_send_gen_cmd(0xF0, 0, chip->start, map, cfi, cfi->device_type, NULL);
+		DISABLE_VPP(map);
+		ret = -EIO;
+	}       
+	DISABLE_VPP(map);
+	chip->state = FL_READY;
+	wake_up(&chip->wq);
+	cfi_spin_unlock(chip->mutex);
+	
+	return ret;
+}
+
+static int cfi_amdstd_write (struct mtd_info *mtd, loff_t to , size_t len, size_t *retlen, const u_char *buf)
+{
+	struct map_info *map = mtd->priv;
+	struct cfi_private *cfi = map->fldrv_priv;
+	int ret = 0;
+	int chipnum;
+	unsigned long ofs, chipstart;
+
+	*retlen = 0;
+	if (!len)
+		return 0;
+
+	chipnum = to >> cfi->chipshift;
+	ofs = to  - (chipnum << cfi->chipshift);
+	chipstart = cfi->chips[chipnum].start;
+
+	/* If it's not bus-aligned, do the first byte write */
+	if (ofs & (CFIDEV_BUSWIDTH-1)) {
+		unsigned long bus_ofs = ofs & ~(CFIDEV_BUSWIDTH-1);
+		int i = ofs - bus_ofs;
+		int n = 0;
+		u_char tmp_buf[4];
+		__u32 datum;
+
+		map->copy_from(map, tmp_buf, bus_ofs + cfi->chips[chipnum].start, CFIDEV_BUSWIDTH);
+		while (len && i < CFIDEV_BUSWIDTH)
+			tmp_buf[i++] = buf[n++], len--;
+
+		if (cfi_buswidth_is_2()) {
+			datum = *(__u16*)tmp_buf;
+		} else if (cfi_buswidth_is_4()) {
+			datum = *(__u32*)tmp_buf;
+		} else {
+			return -EINVAL;  /* should never happen, but be safe */
+		}
+
+		ret = do_write_oneword(map, &cfi->chips[chipnum], 
+				bus_ofs, datum, 0);
+		if (ret) 
+			return ret;
+		
+		ofs += n;
+		buf += n;
+		(*retlen) += n;
+
+		if (ofs >> cfi->chipshift) {
+			chipnum ++; 
+			ofs = 0;
+			if (chipnum == cfi->numchips)
+				return 0;
+		}
+	}
+	
+	/* Go into unlock bypass mode */
+	cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chipstart, map, cfi, CFI_DEVICETYPE_X8, NULL);
+	cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chipstart, map, cfi, CFI_DEVICETYPE_X8, NULL);
+	cfi_send_gen_cmd(0x20, cfi->addr_unlock1, chipstart, map, cfi, CFI_DEVICETYPE_X8, NULL);
+
+	/* We are now aligned, write as much as possible */
+	while(len >= CFIDEV_BUSWIDTH) {
+		__u32 datum;
+
+		if (cfi_buswidth_is_1()) {
+			datum = *(__u8*)buf;
+		} else if (cfi_buswidth_is_2()) {
+			datum = *(__u16*)buf;
+		} else if (cfi_buswidth_is_4()) {
+			datum = *(__u32*)buf;
+		} else {
+			return -EINVAL;
+		}
+		ret = do_write_oneword(map, &cfi->chips[chipnum],
+				       ofs, datum, cfi->fast_prog);
+		if (ret) {
+			if (cfi->fast_prog){
+				/* Get out of unlock bypass mode */
+				cfi_send_gen_cmd(0x90, 0, chipstart, map, cfi, cfi->device_type, NULL);
+				cfi_send_gen_cmd(0x00, 0, chipstart, map, cfi, cfi->device_type, NULL);
+			}
+			return ret;
+		}
+
+		ofs += CFIDEV_BUSWIDTH;
+		buf += CFIDEV_BUSWIDTH;
+		(*retlen) += CFIDEV_BUSWIDTH;
+		len -= CFIDEV_BUSWIDTH;
+
+		if (ofs >> cfi->chipshift) {
+			if (cfi->fast_prog){
+				/* Get out of unlock bypass mode */
+				cfi_send_gen_cmd(0x90, 0, chipstart, map, cfi, cfi->device_type, NULL);
+				cfi_send_gen_cmd(0x00, 0, chipstart, map, cfi, cfi->device_type, NULL);
+			}
+
+			chipnum ++; 
+			ofs = 0;
+			if (chipnum == cfi->numchips)
+				return 0;
+			chipstart = cfi->chips[chipnum].start;
+			if (cfi->fast_prog){
+				/* Go into unlock bypass mode for next set of chips */
+				cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chipstart, map, cfi, CFI_DEVICETYPE_X8, NULL);
+				cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chipstart, map, cfi, CFI_DEVICETYPE_X8, NULL);
+				cfi_send_gen_cmd(0x20, cfi->addr_unlock1, chipstart, map, cfi, CFI_DEVICETYPE_X8, NULL);
+			}
+		}
+	}
+
+	if (cfi->fast_prog){
+		/* Get out of unlock bypass mode */
+		cfi_send_gen_cmd(0x90, 0, chipstart, map, cfi, cfi->device_type, NULL);
+		cfi_send_gen_cmd(0x00, 0, chipstart, map, cfi, cfi->device_type, NULL);
+	}
+
+	if (len & (CFIDEV_BUSWIDTH-1)) {
+		int i = 0, n = 0;
+		u_char tmp_buf[4];
+		__u32 datum;
+
+		map->copy_from(map, tmp_buf, ofs + cfi->chips[chipnum].start, CFIDEV_BUSWIDTH);
+		while (len--)
+			tmp_buf[i++] = buf[n++];
+
+		if (cfi_buswidth_is_2()) {
+			datum = *(__u16*)tmp_buf;
+		} else if (cfi_buswidth_is_4()) {
+			datum = *(__u32*)tmp_buf;
+		} else {
+			return -EINVAL;  /* should never happen, but be safe */
+		}
+
+		ret = do_write_oneword(map, &cfi->chips[chipnum], 
+				ofs, datum, 0);
+		if (ret) 
+			return ret;
+		
+		(*retlen) += n;
+	}
+
+	return 0;
+}
+
+static inline int do_erase_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr)
+{
+	unsigned int status;
+	unsigned long timeo = jiffies + HZ;
+	struct cfi_private *cfi = map->fldrv_priv;
+	unsigned int rdy_mask;
+	DECLARE_WAITQUEUE(wait, current);
+
+ retry:
+	cfi_spin_lock(chip->mutex);
+
+	if (chip->state != FL_READY){
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		add_wait_queue(&chip->wq, &wait);
+                
+		cfi_spin_unlock(chip->mutex);
+
+		schedule();
+		remove_wait_queue(&chip->wq, &wait);
+#if 0
+		if(signal_pending(current))
+			return -EINTR;
+#endif
+		timeo = jiffies + HZ;
+
+		goto retry;
+	}	
+
+	chip->state = FL_ERASING;
+
+	adr += chip->start;
+	ENABLE_VPP(map);
+	cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, CFI_DEVICETYPE_X8, NULL);
+	cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, CFI_DEVICETYPE_X8, NULL);
+	cfi_send_gen_cmd(0x80, cfi->addr_unlock1, chip->start, map, cfi, CFI_DEVICETYPE_X8, NULL);
+	cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, CFI_DEVICETYPE_X8, NULL);
+	cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, CFI_DEVICETYPE_X8, NULL);
+	cfi_write(map, CMD(0x30), adr);
+	
+	timeo = jiffies + (HZ*20);
+
+	cfi_spin_unlock(chip->mutex);
+	schedule_timeout(HZ);
+	cfi_spin_lock(chip->mutex);
+	
+	rdy_mask = CMD(0x80);
+
+	/* FIXME. Use a timer to check this, and return immediately. */
+	/* Once the state machine's known to be working I'll do that */
+
+	while ( ( (status = cfi_read(map,adr)) & rdy_mask ) != rdy_mask ) {
+		static int z=0;
+
+		if (chip->state != FL_ERASING) {
+			/* Someone's suspended the erase. Sleep */
+			set_current_state(TASK_UNINTERRUPTIBLE);
+			add_wait_queue(&chip->wq, &wait);
+			
+			cfi_spin_unlock(chip->mutex);
+			printk("erase suspended. Sleeping\n");
+			
+			schedule();
+			remove_wait_queue(&chip->wq, &wait);
+#if 0			
+			if (signal_pending(current))
+				return -EINTR;
+#endif			
+			timeo = jiffies + (HZ*2); /* FIXME */
+			cfi_spin_lock(chip->mutex);
+			continue;
+		}
+
+		/* OK Still waiting */
+		if (time_after(jiffies, timeo)) {
+			chip->state = FL_READY;
+			cfi_spin_unlock(chip->mutex);
+			printk("waiting for erase to complete timed out.");
+			DISABLE_VPP(map);
+			return -EIO;
+		}
+		
+		/* Latency issues. Drop the lock, wait a while and retry */
+		cfi_spin_unlock(chip->mutex);
+
+		z++;
+		if ( 0 && !(z % 100 )) 
+			printk("chip not ready yet after erase. looping\n");
+
+		cfi_udelay(1);
+		
+		cfi_spin_lock(chip->mutex);
+		continue;
+	}
+	
+	/* Done and happy. */
+	DISABLE_VPP(map);
+	chip->state = FL_READY;
+	wake_up(&chip->wq);
+	cfi_spin_unlock(chip->mutex);
+	return 0;
+}
+
+static int cfi_amdstd_erase_varsize(struct mtd_info *mtd, struct erase_info *instr)
+{
+	struct map_info *map = mtd->priv;
+	struct cfi_private *cfi = map->fldrv_priv;
+	unsigned long adr, len;
+	int chipnum, ret = 0;
+	int i, first;
+	struct mtd_erase_region_info *regions = mtd->eraseregions;
+
+	if (instr->addr > mtd->size)
+		return -EINVAL;
+
+	if ((instr->len + instr->addr) > 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;
+
+	/* Skip all erase regions which are ended before the start of 
+	   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.
+	*/
+	
+	while (i < mtd->numeraseregions && instr->addr >= regions[i].offset)
+	       i++;
+	i--;
+
+	/* OK, now i is pointing at the erase region in which this 
+	   erase request starts. Check the start of the requested
+	   erase range is aligned with the erase size which is in
+	   effect here.
+	*/
+
+	if (instr->addr & (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 && (instr->addr + instr->len) >= regions[i].offset)
+		i++;
+
+	/* As before, drop back one to point at the region in which
+	   the address actually falls
+	*/
+	i--;
+	
+	if ((instr->addr + instr->len) & (regions[i].erasesize-1))
+		return -EINVAL;
+	
+	chipnum = instr->addr >> cfi->chipshift;
+	adr = instr->addr - (chipnum << cfi->chipshift);
+	len = instr->len;
+
+	i=first;
+
+	while(len) {
+		ret = do_erase_oneblock(map, &cfi->chips[chipnum], adr);
+
+		if (ret)
+			return ret;
+
+		adr += regions[i].erasesize;
+		len -= regions[i].erasesize;
+
+		if (adr % (1<< cfi->chipshift) == ((regions[i].offset + (regions[i].erasesize * regions[i].numblocks)) %( 1<< cfi->chipshift)))
+			i++;
+
+		if (adr >> cfi->chipshift) {
+			adr = 0;
+			chipnum++;
+			
+			if (chipnum >= cfi->numchips)
+			break;
+		}
+	}
+
+	instr->state = MTD_ERASE_DONE;
+	if (instr->callback)
+		instr->callback(instr);
+	
+	return 0;
+}
+
+static int cfi_amdstd_erase_onesize(struct mtd_info *mtd, struct erase_info *instr)
+{
+	struct map_info *map = mtd->priv;
+	struct cfi_private *cfi = map->fldrv_priv;
+	unsigned long adr, len;
+	int chipnum, ret = 0;
+
+	if (instr->addr & (mtd->erasesize - 1))
+		return -EINVAL;
+
+	if (instr->len & (mtd->erasesize -1))
+		return -EINVAL;
+
+	if ((instr->len + instr->addr) > mtd->size)
+		return -EINVAL;
+
+	chipnum = instr->addr >> cfi->chipshift;
+	adr = instr->addr - (chipnum << cfi->chipshift);
+	len = instr->len;
+
+	while(len) {
+		ret = do_erase_oneblock(map, &cfi->chips[chipnum], adr);
+
+		if (ret)
+			return ret;
+
+		adr += mtd->erasesize;
+		len -= mtd->erasesize;
+
+		if (adr >> cfi->chipshift) {
+			adr = 0;
+			chipnum++;
+			
+			if (chipnum >= cfi->numchips)
+			break;
+		}
+	}
+		
+	instr->state = MTD_ERASE_DONE;
+	if (instr->callback)
+		instr->callback(instr);
+	
+	return 0;
+}
+
+static void cfi_amdstd_sync (struct mtd_info *mtd)
+{
+	struct map_info *map = mtd->priv;
+	struct cfi_private *cfi = map->fldrv_priv;
+	int i;
+	struct flchip *chip;
+	int ret = 0;
+	DECLARE_WAITQUEUE(wait, current);
+
+	for (i=0; !ret && i<cfi->numchips; i++) {
+		chip = &cfi->chips[i];
+
+	retry:
+		cfi_spin_lock(chip->mutex);
+
+		switch(chip->state) {
+		case FL_READY:
+		case FL_STATUS:
+		case FL_CFI_QUERY:
+		case FL_JEDEC_QUERY:
+			chip->oldstate = chip->state;
+			chip->state = FL_SYNCING;
+			/* No need to wake_up() on this state change - 
+			 * as the whole point is that nobody can do anything
+			 * with the chip now anyway.
+			 */
+		case FL_SYNCING:
+			cfi_spin_unlock(chip->mutex);
+			break;
+
+		default:
+			/* Not an idle state */
+			add_wait_queue(&chip->wq, &wait);
+			
+			cfi_spin_unlock(chip->mutex);
+
+			schedule();
+
+		        remove_wait_queue(&chip->wq, &wait);
+			
+			goto retry;
+		}
+	}
+
+	/* Unlock the chips again */
+
+	for (i--; i >=0; i--) {
+		chip = &cfi->chips[i];
+
+		cfi_spin_lock(chip->mutex);
+		
+		if (chip->state == FL_SYNCING) {
+			chip->state = chip->oldstate;
+			wake_up(&chip->wq);
+		}
+		cfi_spin_unlock(chip->mutex);
+	}
+}
+
+
+static int cfi_amdstd_suspend(struct mtd_info *mtd)
+{
+	struct map_info *map = mtd->priv;
+	struct cfi_private *cfi = map->fldrv_priv;
+	int i;
+	struct flchip *chip;
+	int ret = 0;
+//printk("suspend\n");
+
+	for (i=0; !ret && i<cfi->numchips; i++) {
+		chip = &cfi->chips[i];
+
+		cfi_spin_lock(chip->mutex);
+
+		switch(chip->state) {
+		case FL_READY:
+		case FL_STATUS:
+		case FL_CFI_QUERY:
+		case FL_JEDEC_QUERY:
+			chip->oldstate = chip->state;
+			chip->state = FL_PM_SUSPENDED;
+			/* No need to wake_up() on this state change - 
+			 * as the whole point is that nobody can do anything
+			 * with the chip now anyway.
+			 */
+		case FL_PM_SUSPENDED:
+			break;
+
+		default:
+			ret = -EAGAIN;
+			break;
+		}
+		cfi_spin_unlock(chip->mutex);
+	}
+
+	/* Unlock the chips again */
+
+	if (ret) {
+    		for (i--; i >=0; i--) {
+			chip = &cfi->chips[i];
+
+			cfi_spin_lock(chip->mutex);
+		
+			if (chip->state == FL_PM_SUSPENDED) {
+				chip->state = chip->oldstate;
+				wake_up(&chip->wq);
+			}
+			cfi_spin_unlock(chip->mutex);
+		}
+	}
+	
+	return ret;
+}
+
+static void cfi_amdstd_resume(struct mtd_info *mtd)
+{
+	struct map_info *map = mtd->priv;
+	struct cfi_private *cfi = map->fldrv_priv;
+	int i;
+	struct flchip *chip;
+//printk("resume\n");
+
+	for (i=0; i<cfi->numchips; i++) {
+	
+		chip = &cfi->chips[i];
+
+		cfi_spin_lock(chip->mutex);
+		
+		if (chip->state == FL_PM_SUSPENDED) {
+			chip->state = FL_READY;
+			cfi_write(map, CMD(0xF0), chip->start);
+			wake_up(&chip->wq);
+		}
+		else
+			printk("Argh. Chip not in PM_SUSPENDED state upon resume()\n");
+
+		cfi_spin_unlock(chip->mutex);
+	}
+}
+
+static void cfi_amdstd_destroy(struct mtd_info *mtd)
+{
+	struct map_info *map = mtd->priv;
+	struct cfi_private *cfi = map->fldrv_priv;
+	kfree(cfi->cmdset_priv);
+	kfree(cfi);
+}
+
+#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
+#define cfi_amdstd_init init_module
+#define cfi_amdstd_exit cleanup_module
+#endif
+
+static char im_name[]="cfi_cmdset_0002";
+
+mod_init_t cfi_amdstd_init(void)
+{
+	inter_module_register(im_name, THIS_MODULE, &cfi_cmdset_0002);
+	return 0;
+}
+
+mod_exit_t cfi_amdstd_exit(void)
+{
+	inter_module_unregister(im_name);
+}
+
+module_init(cfi_amdstd_init);
+module_exit(cfi_amdstd_exit);
+