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

• Lines: 284
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.4.5/linux/drivers/mtd/docprobe.c
• Orig date: Fri Feb 9 11:30:23 2001

diff -u --recursive --new-file v2.4.5/linux/drivers/mtd/docprobe.c linux/drivers/mtd/docprobe.c
@@ -1,283 +0,0 @@
-
-/* Linux driver for Disk-On-Chip devices    */
-/* Probe routines common to all DoC devices */
-/* (c) 1999 Machine Vision Holdings, Inc.   */
-/* Author: David Woodhouse <dwmw2@mvhi.com> */
-/* $Id: docprobe.c,v 1.21 2000/12/03 19:32:34 dwmw2 Exp $ */
-
-
-
-/* DOC_PASSIVE_PROBE:
-   In order to ensure that the BIOS checksum is correct at boot time, and 
-   hence that the onboard BIOS extension gets executed, the DiskOnChip 
-   goes into reset mode when it is read sequentially: all registers 
-   return 0xff until the chip is woken up again by writing to the 
-   DOCControl register. 
-
-   Unfortunately, this means that the probe for the DiskOnChip is unsafe, 
-   because one of the first things it does is write to where it thinks 
-   the DOCControl register should be - which may well be shared memory 
-   for another device. I've had machines which lock up when this is 
-   attempted. Hence the possibility to do a passive probe, which will fail 
-   to detect a chip in reset mode, but is at least guaranteed not to lock
-   the machine.
-
-   If you have this problem, uncomment the following line:
-#define DOC_PASSIVE_PROBE
-*/
-
-
-/* DOC_SINGLE_DRIVER:
-   Millennium driver has been merged into DOC2000 driver.
-
-   The newly-merged driver doesn't appear to work for writing. It's the
-   same with the DiskOnChip 2000 and the Millennium. If you have a 
-   Millennium and you want write support to work, remove the definition
-   of DOC_SINGLE_DRIVER below to use the old doc2001-specific driver.
-
-   Otherwise, it's left on in the hope that it'll annoy someone with
-   a Millennium enough that they go through and work out what the 
-   difference is :)
-*/
-#define DOC_SINGLE_DRIVER
-
-#include <linux/config.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <asm/errno.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <linux/miscdevice.h>
-#include <linux/pci.h>
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include <linux/init.h>
-#include <linux/types.h>
-
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/nand.h>
-#include <linux/mtd/doc2000.h>
-
-/* Where to look for the devices? */
-#ifndef CONFIG_MTD_DOCPROBE_ADDRESS
-#define CONFIG_MTD_DOCPROBE_ADDRESS 0
-#endif
-
-
-static unsigned long doc_config_location = CONFIG_MTD_DOCPROBE_ADDRESS;
-MODULE_PARM(doc_config_location, "l");
-
-
-static unsigned long __initdata doc_locations[] = {
-#if defined (__alpha__) || defined(__i386__)
-#ifdef CONFIG_MTD_DOCPROBE_HIGH
-	0xfffc8000, 0xfffca000, 0xfffcc000, 0xfffce000, 
-	0xfffd0000, 0xfffd2000, 0xfffd4000, 0xfffd6000,
-	0xfffd8000, 0xfffda000, 0xfffdc000, 0xfffde000, 
-	0xfffe0000, 0xfffe2000, 0xfffe4000, 0xfffe6000, 
-	0xfffe8000, 0xfffea000, 0xfffec000, 0xfffee000,
-#else /*  CONFIG_MTD_DOCPROBE_HIGH */
-	0xc8000, 0xca000, 0xcc000, 0xce000, 
-	0xd0000, 0xd2000, 0xd4000, 0xd6000,
-	0xd8000, 0xda000, 0xdc000, 0xde000, 
-	0xe0000, 0xe2000, 0xe4000, 0xe6000, 
-	0xe8000, 0xea000, 0xec000, 0xee000,
-#endif /*  CONFIG_MTD_DOCPROBE_HIGH */
-#elif defined(__ppc__)
-	0xe4000000,
-#else 
-#warning Unknown architecture for DiskOnChip. No default probe locations defined
-#endif
-	0 };
-
-/* doccheck: Probe a given memory window to see if there's a DiskOnChip present */
-
-static inline int __init doccheck(unsigned long potential, unsigned long physadr)
-{
-	unsigned long window=potential;
-	unsigned char tmp, ChipID;
-#ifndef DOC_PASSIVE_PROBE
-	unsigned char tmp2;
-#endif
-
-	/* Routine copied from the Linux DOC driver */
-
-#ifdef CONFIG_MTD_DOCPROBE_55AA
-	/* Check for 0x55 0xAA signature at beginning of window,
-	   this is no longer true once we remove the IPL (for Millennium */
-	if (ReadDOC(window, Sig1) != 0x55 || ReadDOC(window, Sig2) != 0xaa)
-		return 0;
-#endif /* CONFIG_MTD_DOCPROBE_55AA */
-
-#ifndef DOC_PASSIVE_PROBE	
-	/* It's not possible to cleanly detect the DiskOnChip - the
-	 * bootup procedure will put the device into reset mode, and
-	 * it's not possible to talk to it without actually writing
-	 * to the DOCControl register. So we store the current contents
-	 * of the DOCControl register's location, in case we later decide
-	 * that it's not a DiskOnChip, and want to put it back how we
-	 * found it. 
-	 */
-	tmp2 = ReadDOC(window, DOCControl);
-	
-	/* Reset the DiskOnChip ASIC */
-	WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET, 
-		 window, DOCControl);
-	WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET, 
-		 window, DOCControl);
-	
-	/* Enable the DiskOnChip ASIC */
-	WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL, 
-		 window, DOCControl);
-	WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL, 
-		 window, DOCControl);
-#endif /* !DOC_PASSIVE_PROBE */	
-
-	ChipID = ReadDOC(window, ChipID);
-  
-	switch (ChipID) {
-	case DOC_ChipID_Doc2k:
-		/* Check the TOGGLE bit in the ECC register */
-		tmp = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
-		if ((ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT) != tmp)
-				return ChipID;
-		break;
-		
-	case DOC_ChipID_DocMil:
-		/* Check the TOGGLE bit in the ECC register */
-		tmp = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
-		if ((ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT) != tmp)
-				return ChipID;
-		break;
-		
-	default:
-#ifndef CONFIG_MTD_DOCPROBE_55AA
-		printk(KERN_WARNING "Possible DiskOnChip with unknown ChipID %2.2X found at 0x%lx\n",
-		       ChipID, physadr);
-#endif
-#ifndef DOC_PASSIVE_PROBE
-		/* Put back the contents of the DOCControl register, in case it's not
-		 * actually a DiskOnChip.
-		 */
-		WriteDOC(tmp2, window, DOCControl);
-#endif
-		return 0;
-	}
-
-	printk(KERN_WARNING "DiskOnChip failed TOGGLE test, dropping.\n");
-
-#ifndef DOC_PASSIVE_PROBE
-	/* Put back the contents of the DOCControl register: it's not a DiskOnChip */
-	WriteDOC(tmp2, window, DOCControl);
-#endif
-	return 0;
-}   
-
-
-static void DoC_Probe(unsigned long physadr)
-{
-	unsigned long docptr;
-	struct DiskOnChip *this;
-	struct mtd_info *mtd;
-	int ChipID;
-	char namebuf[15];
-	char *name = namebuf;
-	char *im_funcname = NULL;
-	char *im_modname = NULL;
-	void (*initroutine)(struct mtd_info *) = NULL;
-
-	docptr = (unsigned long)ioremap(physadr, 0x2000);
-	
-	if (!docptr)
-		return;
-	
-	if ((ChipID = doccheck(docptr, physadr))) {
-		
-		mtd = kmalloc(sizeof(struct DiskOnChip) + sizeof(struct mtd_info), GFP_KERNEL);
-
-		if (!mtd) {
-			printk("Cannot allocate memory for data structures. Dropping.\n");
-			iounmap((void *)docptr);
-			return;
-		}
-		
-		this = (struct DiskOnChip *)(&mtd[1]);
-		
-		memset((char *)mtd,0, sizeof(struct mtd_info));
-		memset((char *)this, 0, sizeof(struct DiskOnChip));
-
-		mtd->priv = this;
-		this->virtadr = docptr;
-		this->physadr = physadr;
-		this->ChipID = ChipID;
-		sprintf(namebuf, "with ChipID %2.2X", ChipID);
-
-		switch(ChipID) {
-		case DOC_ChipID_Doc2k:
-			name="2000";
-			im_funcname = "DoC2k_init";
-			im_modname = "doc2000";
-			break;
-			
-		case DOC_ChipID_DocMil:
-			name="Millennium";
-#ifdef DOC_SINGLE_DRIVER
-			im_funcname = "DoC2k_init";
-			im_modname = "doc2000";
-#else
-			im_funcname = "DoCMil_init";
-			im_modname = "doc2001";
-#endif /* DOC_SINGLE_DRIVER */
-			break;
-		}
-
-		if (im_funcname)
-			initroutine = inter_module_get_request(im_funcname, im_modname);
-
-		if (initroutine) {
-			(*initroutine)(mtd);
-			inter_module_put(im_funcname);
-			return;
-		}
-		printk("Cannot find driver for DiskOnChip %s at 0x%lX\n", name, physadr);
-	}
-	iounmap((void *)docptr);
-}
-
-
-/****************************************************************************
- *
- * Module stuff
- *
- ****************************************************************************/
-
-#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
-#define init_doc init_module
-#endif
-
-int __init init_doc(void)
-{
-	int i;
-	
-	printk(KERN_NOTICE "M-Systems DiskOnChip driver. (C) 1999 Machine Vision Holdings, Inc.\n");
-#ifdef PRERELEASE
-	printk(KERN_INFO "$Id: docprobe.c,v 1.21 2000/12/03 19:32:34 dwmw2 Exp $\n");
-#endif
-	if (doc_config_location) {
-		printk("Using configured probe address 0x%lx\n", doc_config_location);
-		DoC_Probe(doc_config_location);
-	} else {
-		for (i=0; doc_locations[i]; i++) {
-			DoC_Probe(doc_locations[i]);
-		}
-	}
-	/* So it looks like we've been used and we get unloaded */
-	MOD_INC_USE_COUNT;
-	MOD_DEC_USE_COUNT;
-	return 0;
-	
-}
-
-module_init(init_doc);
-