387 lines
11 KiB
C
387 lines
11 KiB
C
|
|
/* Linux driver for Disk-On-Chip devices */
|
|
/* Probe routines common to all DoC devices */
|
|
/* (C) 1999 Machine Vision Holdings, Inc. */
|
|
/* (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> */
|
|
|
|
/* $Id: docprobe.c,v 1.46 2005/11/07 11:14:25 gleixner 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 old Millennium-only driver has been retained just in case there
|
|
are problems with the new code. If the combined driver doesn't work
|
|
for you, you can try the old one by undefining DOC_SINGLE_DRIVER
|
|
below and also enabling it in your configuration. If this fixes the
|
|
problems, please send a report to the MTD mailing list at
|
|
<linux-mtd@lists.infradead.org>.
|
|
*/
|
|
#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 <linux/delay.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/nand.h>
|
|
#include <linux/mtd/doc2000.h>
|
|
#include <linux/mtd/compatmac.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_param(doc_config_location, ulong, 0);
|
|
MODULE_PARM_DESC(doc_config_location, "Physical memory address at which to probe for DiskOnChip");
|
|
|
|
static unsigned long __initdata doc_locations[] = {
|
|
#if defined (__alpha__) || defined(__i386__) || defined(__x86_64__)
|
|
#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,
|
|
#elif defined(CONFIG_MOMENCO_OCELOT)
|
|
0x2f000000,
|
|
0xff000000,
|
|
#elif defined(CONFIG_MOMENCO_OCELOT_G) || defined (CONFIG_MOMENCO_OCELOT_C)
|
|
0xff000000,
|
|
##else
|
|
#warning Unknown architecture for DiskOnChip. No default probe locations defined
|
|
#endif
|
|
0xffffffff };
|
|
|
|
/* doccheck: Probe a given memory window to see if there's a DiskOnChip present */
|
|
|
|
static inline int __init doccheck(void __iomem *potential, unsigned long physadr)
|
|
{
|
|
void __iomem *window=potential;
|
|
unsigned char tmp, tmpb, tmpc, 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 */
|
|
|
|
/* We need to read the ChipID register four times. For some
|
|
newer DiskOnChip 2000 units, the first three reads will
|
|
return the DiskOnChip Millennium ident. Don't ask. */
|
|
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;
|
|
tmpb = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
|
|
tmpc = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
|
|
if (tmp != tmpb && tmp == tmpc)
|
|
return ChipID;
|
|
break;
|
|
|
|
case DOC_ChipID_DocMil:
|
|
/* Check for the new 2000 with Millennium ASIC */
|
|
ReadDOC(window, ChipID);
|
|
ReadDOC(window, ChipID);
|
|
if (ReadDOC(window, ChipID) != DOC_ChipID_DocMil)
|
|
ChipID = DOC_ChipID_Doc2kTSOP;
|
|
|
|
/* Check the TOGGLE bit in the ECC register */
|
|
tmp = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
|
|
tmpb = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
|
|
tmpc = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
|
|
if (tmp != tmpb && tmp == tmpc)
|
|
return ChipID;
|
|
break;
|
|
|
|
case DOC_ChipID_DocMilPlus16:
|
|
case DOC_ChipID_DocMilPlus32:
|
|
case 0:
|
|
/* Possible Millennium+, need to do more checks */
|
|
#ifndef DOC_PASSIVE_PROBE
|
|
/* Possibly release from power down mode */
|
|
for (tmp = 0; (tmp < 4); tmp++)
|
|
ReadDOC(window, Mplus_Power);
|
|
|
|
/* Reset the DiskOnChip ASIC */
|
|
tmp = DOC_MODE_RESET | DOC_MODE_MDWREN | DOC_MODE_RST_LAT |
|
|
DOC_MODE_BDECT;
|
|
WriteDOC(tmp, window, Mplus_DOCControl);
|
|
WriteDOC(~tmp, window, Mplus_CtrlConfirm);
|
|
|
|
mdelay(1);
|
|
/* Enable the DiskOnChip ASIC */
|
|
tmp = DOC_MODE_NORMAL | DOC_MODE_MDWREN | DOC_MODE_RST_LAT |
|
|
DOC_MODE_BDECT;
|
|
WriteDOC(tmp, window, Mplus_DOCControl);
|
|
WriteDOC(~tmp, window, Mplus_CtrlConfirm);
|
|
mdelay(1);
|
|
#endif /* !DOC_PASSIVE_PROBE */
|
|
|
|
ChipID = ReadDOC(window, ChipID);
|
|
|
|
switch (ChipID) {
|
|
case DOC_ChipID_DocMilPlus16:
|
|
case DOC_ChipID_DocMilPlus32:
|
|
/* Check the TOGGLE bit in the toggle register */
|
|
tmp = ReadDOC(window, Mplus_Toggle) & DOC_TOGGLE_BIT;
|
|
tmpb = ReadDOC(window, Mplus_Toggle) & DOC_TOGGLE_BIT;
|
|
tmpc = ReadDOC(window, Mplus_Toggle) & DOC_TOGGLE_BIT;
|
|
if (tmp != tmpb && tmp == tmpc)
|
|
return ChipID;
|
|
default:
|
|
break;
|
|
}
|
|
/* FALL TRHU */
|
|
|
|
default:
|
|
|
|
#ifdef CONFIG_MTD_DOCPROBE_55AA
|
|
printk(KERN_DEBUG "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 int docfound;
|
|
|
|
#ifdef CONFIG_DOC2000
|
|
extern void DoC2k_init(struct mtd_info *);
|
|
#define doc2k_initfunc (&DoC2k_init)
|
|
#else
|
|
#define doc2k_initfunc NULL
|
|
#endif
|
|
|
|
#ifdef CONFIG_DOC2001
|
|
extern void DoCMil_init(struct mtd_info *);
|
|
#define docmil_initfunc (&DoCMil_init)
|
|
#else
|
|
#define docmil_initfunc NULL
|
|
#endif
|
|
|
|
#ifdef CONFIG_DOC2001PLUS
|
|
extern void DoCMilPlus_init(struct mtd_info *);
|
|
#define docmplus_initfunc (&DoCMilPlus_init)
|
|
#else
|
|
#define docmplus_initfunc NULL
|
|
#endif
|
|
|
|
static void __init DoC_Probe(unsigned long physadr)
|
|
{
|
|
void __iomem *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 = ioremap(physadr, DOC_IOREMAP_LEN);
|
|
|
|
if (!docptr)
|
|
return;
|
|
|
|
if ((ChipID = doccheck(docptr, physadr))) {
|
|
if (ChipID == DOC_ChipID_Doc2kTSOP) {
|
|
/* Remove this at your own peril. The hardware driver works but nothing prevents you from erasing bad blocks */
|
|
printk(KERN_NOTICE "Refusing to drive DiskOnChip 2000 TSOP until Bad Block Table is correctly supported by INFTL\n");
|
|
iounmap(docptr);
|
|
return;
|
|
}
|
|
docfound = 1;
|
|
mtd = kmalloc(sizeof(struct DiskOnChip) + sizeof(struct mtd_info), GFP_KERNEL);
|
|
|
|
if (!mtd) {
|
|
printk(KERN_WARNING "Cannot allocate memory for data structures. Dropping.\n");
|
|
iounmap(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_Doc2kTSOP:
|
|
name="2000 TSOP";
|
|
im_funcname = "DoC2k_init";
|
|
im_modname = "doc2000";
|
|
initroutine = doc2k_initfunc;
|
|
break;
|
|
|
|
case DOC_ChipID_Doc2k:
|
|
name="2000";
|
|
im_funcname = "DoC2k_init";
|
|
im_modname = "doc2000";
|
|
initroutine = doc2k_initfunc;
|
|
break;
|
|
|
|
case DOC_ChipID_DocMil:
|
|
name="Millennium";
|
|
#ifdef DOC_SINGLE_DRIVER
|
|
im_funcname = "DoC2k_init";
|
|
im_modname = "doc2000";
|
|
initroutine = doc2k_initfunc;
|
|
#else
|
|
im_funcname = "DoCMil_init";
|
|
im_modname = "doc2001";
|
|
initroutine = docmil_initfunc;
|
|
#endif /* DOC_SINGLE_DRIVER */
|
|
break;
|
|
|
|
case DOC_ChipID_DocMilPlus16:
|
|
case DOC_ChipID_DocMilPlus32:
|
|
name="MillenniumPlus";
|
|
im_funcname = "DoCMilPlus_init";
|
|
im_modname = "doc2001plus";
|
|
initroutine = docmplus_initfunc;
|
|
break;
|
|
}
|
|
|
|
#ifdef CONFIG_MODULES
|
|
if (im_funcname && !initroutine)
|
|
initroutine = symbol_get(im_funcname);
|
|
if (im_funcname && !initroutine) {
|
|
request_module(im_modname);
|
|
initroutine = symbol_get(im_funcname);
|
|
}
|
|
#endif
|
|
if (initroutine) {
|
|
(*initroutine)(mtd);
|
|
symbol_put_addr(initroutine);
|
|
return;
|
|
}
|
|
printk(KERN_NOTICE "Cannot find driver for DiskOnChip %s at 0x%lX\n", name, physadr);
|
|
kfree(mtd);
|
|
}
|
|
iounmap(docptr);
|
|
}
|
|
|
|
|
|
/****************************************************************************
|
|
*
|
|
* Module stuff
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int __init init_doc(void)
|
|
{
|
|
int i;
|
|
|
|
if (doc_config_location) {
|
|
printk(KERN_INFO "Using configured DiskOnChip probe address 0x%lx\n", doc_config_location);
|
|
DoC_Probe(doc_config_location);
|
|
} else {
|
|
for (i=0; (doc_locations[i] != 0xffffffff); i++) {
|
|
DoC_Probe(doc_locations[i]);
|
|
}
|
|
}
|
|
/* No banner message any more. Print a message if no DiskOnChip
|
|
found, so the user knows we at least tried. */
|
|
if (!docfound)
|
|
printk(KERN_INFO "No recognised DiskOnChip devices found\n");
|
|
return -EAGAIN;
|
|
}
|
|
|
|
module_init(init_doc);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
|
|
MODULE_DESCRIPTION("Probe code for DiskOnChip 2000 and Millennium devices");
|
|
|