/* (C) 1999 Machine Vision Holdings, Inc. */
/* (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> */
-/* $Id: docprobe.c,v 1.36 2003/05/23 11:29:34 dwmw2 Exp $ */
+/* $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
+ 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.
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
+ 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
+ problems, please send a report to the MTD mailing list at
<linux-mtd@lists.infradead.org>.
*/
#define DOC_SINGLE_DRIVER
static unsigned long doc_config_location = CONFIG_MTD_DOCPROBE_ADDRESS;
-MODULE_PARM(doc_config_location, "l");
+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,
+ 0xfffc8000, 0xfffca000, 0xfffcc000, 0xfffce000,
0xfffd0000, 0xfffd2000, 0xfffd4000, 0xfffd6000,
- 0xfffd8000, 0xfffda000, 0xfffdc000, 0xfffde000,
- 0xfffe0000, 0xfffe2000, 0xfffe4000, 0xfffe6000,
+ 0xfffd8000, 0xfffda000, 0xfffdc000, 0xfffde000,
+ 0xfffe0000, 0xfffe2000, 0xfffe4000, 0xfffe6000,
0xfffe8000, 0xfffea000, 0xfffec000, 0xfffee000,
#else /* CONFIG_MTD_DOCPROBE_HIGH */
- 0xc8000, 0xca000, 0xcc000, 0xce000,
+ 0xc8000, 0xca000, 0xcc000, 0xce000,
0xd0000, 0xd2000, 0xd4000, 0xd6000,
- 0xd8000, 0xda000, 0xdc000, 0xde000,
- 0xe0000, 0xe2000, 0xe4000, 0xe6000,
+ 0xd8000, 0xda000, 0xdc000, 0xde000,
+ 0xe0000, 0xe2000, 0xe4000, 0xe6000,
0xe8000, 0xea000, 0xec000, 0xee000,
#endif /* CONFIG_MTD_DOCPROBE_HIGH */
#elif defined(__PPC__)
/* 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)
+static inline int __init doccheck(void __iomem *potential, unsigned long physadr)
{
- unsigned long window=potential;
+ void __iomem *window=potential;
unsigned char tmp, tmpb, tmpc, ChipID;
#ifndef DOC_PASSIVE_PROBE
unsigned char tmp2;
return 0;
#endif /* CONFIG_MTD_DOCPROBE_55AA */
-#ifndef DOC_PASSIVE_PROBE
+#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.
+ * found it.
*/
tmp2 = ReadDOC(window, DOCControl);
-
+
/* Reset the DiskOnChip ASIC */
- WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
+ WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
window, DOCControl);
- WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
+ 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,
+ WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
window, DOCControl);
- WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
+ WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
window, DOCControl);
-#endif /* !DOC_PASSIVE_PROBE */
+#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 */
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;
if (tmp != tmpb && tmp == tmpc)
return ChipID;
break;
-
+
case DOC_ChipID_DocMilPlus16:
case DOC_ChipID_DocMilPlus32:
case 0:
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 |
WriteDOC(tmp, window, Mplus_DOCControl);
WriteDOC(~tmp, window, Mplus_CtrlConfirm);
mdelay(1);
-#endif /* !DOC_PASSIVE_PROBE */
+#endif /* !DOC_PASSIVE_PROBE */
ChipID = ReadDOC(window, ChipID);
tmpc = ReadDOC(window, Mplus_Toggle) & DOC_TOGGLE_BIT;
if (tmp != tmpb && tmp == tmpc)
return ChipID;
- break;
default:
break;
}
default:
-#ifndef CONFIG_MTD_DOCPROBE_55AA
- printk(KERN_WARNING "Possible DiskOnChip with unknown ChipID %2.2X found at 0x%lx\n",
+#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
WriteDOC(tmp2, window, DOCControl);
#endif
return 0;
-}
+}
static int docfound;
static void __init DoC_Probe(unsigned long physadr)
{
- unsigned long docptr;
+ void __iomem *docptr;
struct DiskOnChip *this;
struct mtd_info *mtd;
int ChipID;
char *im_modname = NULL;
void (*initroutine)(struct mtd_info *) = NULL;
- docptr = (unsigned long)ioremap(physadr, DOC_IOREMAP_LEN);
-
+ 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((void *)docptr);
+ iounmap(docptr);
return;
}
-
+
this = (struct DiskOnChip *)(&mtd[1]);
-
+
memset((char *)mtd,0, sizeof(struct mtd_info));
memset((char *)this, 0, sizeof(struct DiskOnChip));
sprintf(namebuf, "with ChipID %2.2X", ChipID);
switch(ChipID) {
+ case DOC_ChipID_Doc2kTSOP:
+ name="2000 TSOP";
+ im_funcname = "DoC2k_init";
+ im_modname = "doc2000";
+ break;
+
case DOC_ChipID_Doc2k:
name="2000";
im_funcname = "DoC2k_init";
im_modname = "doc2000";
break;
-
+
case DOC_ChipID_DocMil:
name="Millennium";
#ifdef DOC_SINGLE_DRIVER
printk(KERN_NOTICE "Cannot find driver for DiskOnChip %s at 0x%lX\n", name, physadr);
kfree(mtd);
}
- iounmap((void *)docptr);
+ iounmap(docptr);
}
*
****************************************************************************/
-int __init init_doc(void)
+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);
git://git.onelab.eu / linux-2.6.git / blobdiff