/* (C) 1999 Machine Vision Holdings, Inc. */
/* (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> */
-/* $Id: docprobe.c,v 1.44 2005/01/05 12:40:36 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 __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__)
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);
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);
WriteDOC(tmp2, window, DOCControl);
#endif
return 0;
-}
+}
static int docfound;
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 */
iounmap(docptr);
return;
}
-
+
this = (struct DiskOnChip *)(&mtd[1]);
-
+
memset((char *)mtd,0, sizeof(struct mtd_info));
memset((char *)this, 0, sizeof(struct DiskOnChip));
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
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