patch-2.4.6 linux/drivers/mtd/doc1000.c

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diff -u --recursive --new-file v2.4.5/linux/drivers/mtd/doc1000.c linux/drivers/mtd/doc1000.c
@@ -1,597 +0,0 @@
-/*======================================================================
-
-  $Id: doc1000.c,v 1.11 2000/11/24 13:43:16 dwmw2 Exp $
-
-======================================================================*/
-
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <asm/uaccess.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/ptrace.h>
-#include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/timer.h>
-#include <linux/major.h>
-#include <linux/fs.h>
-#include <linux/ioctl.h>
-#include <asm/io.h>
-#include <asm/system.h>
-#include <asm/segment.h>
-#include <stdarg.h>
-#include <linux/delay.h>
-#include <linux/init.h>
-
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/iflash.h>
-
-/* Parameters that can be set with 'insmod' */
-
-static u_long base              = 0xe0000;
-static int erase_timeout	= 10*HZ;	/* in ticks */
-static int retry_limit		= 4;		/* write retries */
-static u_long max_tries       	= 4096;		/* status polling */
-
-MODULE_PARM(base,"l");
-MODULE_PARM(erase_timeout, "i");
-MODULE_PARM(retry_limit, "i");
-MODULE_PARM(max_tries, "i");
-
-#define WINDOW_SIZE 0x2000
-#define WINDOW_MASK (WINDOW_SIZE - 1)
-#define PAGEREG_LO (WINDOW_SIZE)
-#define PAGEREG_HI (WINDOW_SIZE + 2)
-
-static struct mtd_info *mymtd;
-static struct timer_list flashcard_timer;
-
-#define MAX_CELLS		32
-#define MAX_FLASH_DEVICES       8
-
-/* A flash region is composed of one or more "cells", where we allow
-   simultaneous erases if they are in different cells */
-
-
-
-struct mypriv {
-	u_char *baseaddr;
-	u_short curpage;
-	u_char locked;
-	u_short numdevices;
-	u_char interleave;
-	struct erase_info *cur_erases;
-	wait_queue_head_t wq;
-	u_char devstat[MAX_FLASH_DEVICES];
-	u_long devshift;
-};
-
-
-static void flashcard_periodic(u_long data);
-static int flashcard_erase (struct mtd_info *mtd, struct erase_info *instr);
-static int flashcard_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
-static int flashcard_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
-static void flashcard_sync (struct mtd_info *mtd);
-
-static inline void resume_erase(volatile u_char *addr);
-static inline int suspend_erase(volatile u_char *addr);
-static inline int byte_write (volatile u_char *addr, u_char byte);
-static inline int word_write (volatile u_char *addr, __u16 word);
-static inline int check_write(volatile u_char *addr);
-static inline void block_erase (volatile u_char *addr);
-static inline int check_erase(volatile u_char *addr);
-
-#ifdef CONFIG_SMP
-#warning This is definitely not SMP safe. Lock the paging mechanism.
-#endif
-
-static u_char *pagein(struct mtd_info *mtd, u_long addr)
-{
-  struct mypriv *priv=mtd->priv;
-  u_short page = addr >> 13;
-
-  priv->baseaddr[PAGEREG_LO] = page & 0xff;
-  priv->baseaddr[PAGEREG_HI] = page >> 8;
-  priv->curpage = page;
-  
-  return &priv->baseaddr[addr & WINDOW_MASK];
-}
-
-
-void flashcard_sync (struct mtd_info *mtd)
-{
-	struct mypriv *priv=mtd->priv;
-
-	flashcard_periodic((u_long) mtd);
-	printk("sync...");
-	if (priv->cur_erases)
-		interruptible_sleep_on(&priv->wq);
-	printk("Done.\n");
-}
-
-int flashcard_erase (struct mtd_info *mtd, struct erase_info *instr)
-{
-	u_char *pageaddr;
-	struct mypriv *priv=mtd->priv;
-	struct erase_info **tmp=&priv->cur_erases;
-	
-	if (instr->len != mtd->erasesize)
-		return -EINVAL;
-	if (instr->addr + instr->len > mtd->size)
-		return -EINVAL;
-
-	pageaddr=pagein(mtd,instr->addr);
-	instr->mtd = mtd;
-	instr->dev = instr->addr >> priv->devshift;
-	instr->cell = (instr->addr - (instr->dev << priv->devshift)) / mtd->erasesize;
-	instr->next = NULL;
-	instr->state = MTD_ERASE_PENDING;
-	
-	while (*tmp)
-	{
-		tmp = &((*tmp) -> next);
-	}
-	
-	*tmp = instr;
-	flashcard_periodic((u_long)mtd);
-	return 0;
-}
-
-
-int flashcard_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
-{
- 	u_char *pageaddr=pagein(mtd,from);
-	struct mypriv *priv=mtd->priv;
-	u_char device = from >> priv->devshift;
-	u_char cell = (int) (from - (device << priv->devshift)) / mtd->erasesize;
-	int ret = 0, timeron = 0;
-
-	if ((from & WINDOW_MASK) + len <= WINDOW_SIZE)
-		*retlen = len;
-	else
-		*retlen = WINDOW_SIZE - (from & WINDOW_MASK);
-
-	if (priv->devstat[device])
-	{
-		
-		/* There is an erase in progress or pending for this device. Stop it */
-		timeron = del_timer(&flashcard_timer);
-		
-		if (priv->cur_erases && priv->cur_erases->cell == cell) 
-			
-		{
-			/* The erase is on the current cell. Just return all 0xff */ 
-			add_timer(&flashcard_timer);
-			
-			
-			printk("Cell %d currently erasing. Setting to all 0xff\n",cell);
-			memset(buf, 0xff, *retlen);
-			return 0;
-		}
-		if (priv->devstat[device] == MTD_ERASING)
-		{
-			ret = suspend_erase(pageaddr);
-			priv->devstat[device] = MTD_ERASE_SUSPEND;
-		       
-			if (ret) 
-			{
-				printk("flashcard: failed to suspend erase\n");
-				add_timer (&flashcard_timer);
-				return ret;
-			}
-		}
-
-	}
-
-	writew(IF_READ_ARRAY, (u_long)pageaddr & ~1);
-	
-	ret = 0;
-	memcpy (buf, pageaddr, *retlen);
-	
-	writew(IF_READ_CSR, (u_long)pageaddr & ~1);
-	
-	
-	if (priv->devstat[device] & MTD_ERASE_SUSPEND)
-	{
-		resume_erase(pageaddr);
-		priv->devstat[device]=MTD_ERASING;
-	}
-
-
-	if (timeron) add_timer (&flashcard_timer);
-		
-	return ret;
-}
-
-
-int flashcard_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
-{
-	struct mypriv *priv = (struct mypriv *)mtd->priv;
- 	u_char *endaddr, *startaddr;
-	register u_char *pageaddr;
-	u_char device = to >> priv->devshift;
-/*	jiffies_t oldj=jiffies;*/
-	int ret;
-
-	while (priv->devstat[device])
-	{
-		flashcard_sync(mtd);
-	}
-
-	if ((to & WINDOW_MASK) + len <= WINDOW_SIZE)
-		*retlen = len;
-	else
-		*retlen = WINDOW_SIZE - (to & WINDOW_MASK);
-	
-	pageaddr = pagein(mtd, to);
-	startaddr = (u_char *)((u_long) pageaddr & ~1);
-	endaddr = pageaddr+(*retlen);
-
-
-
-	/* Set up to read */
-	writew(IF_READ_CSR, startaddr);
-	
-	/* Make sure it's aligned by reading the first byte if necessary */
-	if (to & 1)
-	{
-		/* Unaligned access */
-
-		u_char cbuf;
-
-		cbuf = *buf;
-
-		if (!((u_long)pageaddr & 0xf))
-			schedule();
-			
-		ret = byte_write(pageaddr, cbuf);
-		if (ret) return ret;
-
-		pageaddr++; buf++;
-	}
-
-
-	for ( ; pageaddr + 1 < endaddr; buf += 2, pageaddr += 2)
-		{
-			/* if ((u_long)pageaddr & 0xf) schedule();*/
-			
-			ret = word_write(pageaddr, *(__u16 *)buf);
-			if (ret) 
-				return ret;
-		}
-	
-	if (pageaddr != endaddr)
-	{
-		/* One more byte to write at the end. */
-		u_char cbuf;
-
-		cbuf = *buf;
-
-		ret = byte_write(pageaddr, cbuf);
-
-		if (ret) return ret;
-	}
-
-	return check_write(startaddr);
-/*	printk("Time taken in flashcard_write: %lx jiffies\n",jiffies - oldj);*/
-}
-
-
-
-
-/*====================================================================*/
-
-static inline int byte_write (volatile u_char *addr, u_char byte)
-{
-	register u_char status;
- 	register u_short i = 0;
-  	
- 	do {
-		status = readb(addr);
-		if (status & CSR_WR_READY)
-		{
-			writeb(IF_WRITE & 0xff, addr);
-			writeb(byte, addr);
-			return 0;
-		}
-		i++;
-	} while(i < max_tries);
-
-		
-	printk(KERN_NOTICE "flashcard: byte_write timed out, status 0x%x\n",status);
-	return -EIO;
-}
-
-static inline int word_write (volatile u_char *addr, __u16 word)
-{
-	register u_short status;
-	register u_short i = 0;
-	
-	do {
-		status = readw(addr);
-		if ((status & CSR_WR_READY) == CSR_WR_READY)
-		{
-			writew(IF_WRITE, addr);
-			writew(word, addr);
-			return 0;
-		}
-		i++;
-	} while(i < max_tries);
-		
-	printk(KERN_NOTICE "flashcard: word_write timed out at %p, status 0x%x\n", addr, status);
-	return -EIO;
-}
-
-static inline void block_erase (volatile u_char *addr)
-{
-	writew(IF_BLOCK_ERASE, addr);
-	writew(IF_CONFIRM, addr);
-}
-
-
-static inline int check_erase(volatile u_char *addr)
-{
-	__u16 status;
-	
-/*	writew(IF_READ_CSR, addr);*/
-	status = readw(addr);
-	
-
-	if ((status & CSR_WR_READY) != CSR_WR_READY)
-		return -EBUSY;
-	
-	if (status & (CSR_ERA_ERR | CSR_VPP_LOW | CSR_WR_ERR)) 
-	{
-		printk(KERN_NOTICE "flashcard: erase failed, status 0x%x\n",
-		       status);
-		return -EIO;
-	}
-	
-	return 0;
-}
-
-static inline int suspend_erase(volatile u_char *addr)
-{
-	__u16 status;
-	u_long i = 0;
-	
-	writew(IF_ERASE_SUSPEND, addr);
-	writew(IF_READ_CSR, addr);
-	
-	do {
-		status = readw(addr);
-		if ((status & CSR_WR_READY) == CSR_WR_READY)
-			return 0;
-		i++;
-	} while(i < max_tries);
-
-	printk(KERN_NOTICE "flashcard: suspend_erase timed out, status 0x%x\n", status);
-	return -EIO;
-
-}
-
-static inline void resume_erase(volatile u_char *addr)
-{
-	__u16 status;
-	
-	writew(IF_READ_CSR, addr);
-	status = readw(addr);
-	
-	/* Only give resume signal if the erase is really suspended */
-	if (status & CSR_ERA_SUSPEND)
-		writew(IF_CONFIRM, addr);
-}
-
-static inline void reset_block(volatile u_char *addr)
-{
-	u_short i;
-	__u16 status;
-
-	writew(IF_CLEAR_CSR, addr);
-
-	for (i = 0; i < 100; i++) {
-		writew(IF_READ_CSR, addr);
-		status = readw(addr);
-		if (status != 0xffff) break;
-		udelay(1000);
-	}
-
-	writew(IF_READ_CSR, addr);
-}
-
-static inline int check_write(volatile u_char *addr)
-{
-	u_short status, i = 0;
-	
-	writew(IF_READ_CSR, addr);
-	
-	do {
-		status = readw(addr);
-		if (status & (CSR_WR_ERR | CSR_VPP_LOW))
-		{
-			printk(KERN_NOTICE "flashcard: write failure at %p, status 0x%x\n", addr, status);
-			reset_block(addr);
-			return -EIO;
-		}
-		if ((status & CSR_WR_READY) == CSR_WR_READY)
-			return 0;
-		i++;
-	} while (i < max_tries);
-
-	printk(KERN_NOTICE "flashcard: write timed out at %p, status 0x%x\n", addr, status);
-	return -EIO;
-}
-
-
-/*====================================================================*/
-
-
-
-static void flashcard_periodic(unsigned long data)
-{
-	register struct mtd_info *mtd = (struct mtd_info *)data;
-	register struct mypriv *priv = mtd->priv;
-	struct erase_info *erase = priv->cur_erases;
-	u_char *pageaddr;
-
-	del_timer (&flashcard_timer);
-
-	if (!erase)
-		return;
-
-	pageaddr = pagein(mtd, erase->addr);
-	
-	if (erase->state == MTD_ERASE_PENDING)
-	{
-		block_erase(pageaddr);
-		priv->devstat[erase->dev] = erase->state = MTD_ERASING;
-		erase->time = jiffies;
-		erase->retries = 0;
-	}
-	else if (erase->state == MTD_ERASING)
-	{
-		/* It's trying to erase. Check whether it's finished */
-
-		int ret = check_erase(pageaddr);
-
-		if (!ret)
-		{
-			/* It's finished OK */
-			priv->devstat[erase->dev] = 0;
-			priv->cur_erases = erase->next;
-			erase->state = MTD_ERASE_DONE;
-			if (erase->callback)
-				(*(erase->callback))(erase);
-			else
-				kfree(erase);
-		}
-		else if (ret == -EIO)
-		{
-			if (++erase->retries > retry_limit)
-			{
-				printk("Failed too many times. Giving up\n");
-				priv->cur_erases = erase->next;
-				priv->devstat[erase->dev] = 0;
-				erase->state = MTD_ERASE_FAILED;
-				if (erase->callback)
-					(*(erase->callback))(erase);
-				else
-					kfree(erase);
-			}
-			else
-				priv->devstat[erase->dev] = erase->state = MTD_ERASE_PENDING;
-		}
-		else if (erase->time + erase_timeout < jiffies)
-		{
-			printk("Flash erase timed out. The world is broken.\n");
-
-			/* Just ignore and hope it goes away. For a while, read ops will give the CSR
-			   and writes won't work. */
-
-			priv->cur_erases = erase->next;
-			priv->devstat[erase->dev] = 0;
-			erase->state = MTD_ERASE_FAILED;
-			if (erase->callback)
-					(*(erase->callback))(erase);
-				else
-					kfree(erase);
-		}
-	}
-
-	if (priv->cur_erases)
-	{
-		flashcard_timer.expires = jiffies + HZ;
-		add_timer (&flashcard_timer);
-	}
-	else 
-		wake_up_interruptible(&priv->wq);
-
-}
-
-#if defined (MODULE) && LINUX_VERSION_CODE < 0x20211
-#define init_doc1000 init_module
-#define cleanup_doc1000 cleanup_module
-#endif
-
-int __init init_doc1000(void)
-{
-	struct mypriv *priv;
-
-	if (!base)
-	{
-		printk(KERN_NOTICE "flashcard: No start address for memory device.\n");
-		return -EINVAL;
-	}
-
-	mymtd  = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
-
-	if (!mymtd)
-	{
-		printk(KERN_NOTICE "physmem: Cannot allocate memory for new MTD device.\n");
-		return -ENOMEM;
-	}
-
-	memset(mymtd,0,sizeof(struct mtd_info));
-
-	mymtd->priv = (void *) kmalloc (sizeof(struct mypriv), GFP_KERNEL);
-	if (!mymtd->priv)
-	  {
-	    kfree(mymtd);
-	    printk(KERN_NOTICE "physmem: Cannot allocate memory for new MTD device's private data.\n");
-	    return -ENOMEM;
-	  }
-	
-
-
-
-	priv=mymtd->priv;
-	init_waitqueue_head(&priv->wq);
-
-	memset (priv,0,sizeof(struct mypriv));
-
-	priv->baseaddr = phys_to_virt(base);
-	priv->numdevices = 4;
-	
-	mymtd->name = "M-Systems DiskOnChip 1000";
-
-	mymtd->size = 0x100000;
-	mymtd->flags = MTD_CLEAR_BITS | MTD_ERASEABLE;
-        mymtd->erase = flashcard_erase;
-	mymtd->point = NULL;
-	mymtd->unpoint = NULL;
-	mymtd->read = flashcard_read;
-	mymtd->write = flashcard_write;
-
-	mymtd->sync = flashcard_sync;
-	mymtd->erasesize = 0x10000;
-	//	mymtd->interleave = 2;
-	priv->devshift =  24;
-	mymtd->type = MTD_NORFLASH;
-	
-	if (add_mtd_device(mymtd))
-	{
-		printk(KERN_NOTICE "MTD device registration failed!\n");
-		kfree(mymtd->priv);
-		kfree(mymtd);
-		return -EAGAIN;
-	}
-	
-	init_timer(&flashcard_timer);
-	flashcard_timer.function = flashcard_periodic;
-	flashcard_timer.data = (u_long)mymtd;
-	return 0;
-}
-
-static void __init cleanup_doc1000(void)
-{
-	kfree (mymtd->priv);
-	del_mtd_device(mymtd);
-	kfree(mymtd);
-}
-
-#if LINUX_VERSION_CODE >= 0x20211
-module_init(init_doc1000);
-module_exit(cleanup_doc1000);
-#endif
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)