diff options
Diffstat (limited to 'drivers/mtd/devices/docprobe.c')
| -rw-r--r-- | drivers/mtd/devices/docprobe.c | 84 |
1 files changed, 42 insertions, 42 deletions
diff --git a/drivers/mtd/devices/docprobe.c b/drivers/mtd/devices/docprobe.c index 197d67045e1e..13178b9dd00a 100644 --- a/drivers/mtd/devices/docprobe.c +++ b/drivers/mtd/devices/docprobe.c @@ -4,22 +4,22 @@ /* (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. @@ -33,9 +33,9 @@ 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 @@ -68,16 +68,16 @@ MODULE_PARM_DESC(doc_config_location, "Physical memory address at which to probe 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__) @@ -111,35 +111,35 @@ static inline int __init doccheck(void __iomem *potential, unsigned long physadr 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 */ @@ -149,7 +149,7 @@ static inline int __init doccheck(void __iomem *potential, unsigned long physadr if (tmp != tmpb && tmp == tmpc) return ChipID; break; - + case DOC_ChipID_DocMil: /* Check for the new 2000 with Millennium ASIC */ ReadDOC(window, ChipID); @@ -164,7 +164,7 @@ static inline int __init doccheck(void __iomem *potential, unsigned long physadr if (tmp != tmpb && tmp == tmpc) return ChipID; break; - + case DOC_ChipID_DocMilPlus16: case DOC_ChipID_DocMilPlus32: case 0: @@ -179,7 +179,7 @@ static inline int __init doccheck(void __iomem *potential, unsigned long physadr 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 | @@ -187,7 +187,7 @@ static inline int __init doccheck(void __iomem *potential, unsigned long physadr WriteDOC(tmp, window, Mplus_DOCControl); WriteDOC(~tmp, window, Mplus_CtrlConfirm); mdelay(1); -#endif /* !DOC_PASSIVE_PROBE */ +#endif /* !DOC_PASSIVE_PROBE */ ChipID = ReadDOC(window, ChipID); @@ -227,7 +227,7 @@ static inline int __init doccheck(void __iomem *potential, unsigned long physadr WriteDOC(tmp2, window, DOCControl); #endif return 0; -} +} static int docfound; @@ -244,10 +244,10 @@ static void __init DoC_Probe(unsigned long physadr) 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 */ @@ -263,9 +263,9 @@ static void __init DoC_Probe(unsigned long physadr) iounmap(docptr); return; } - + this = (struct DiskOnChip *)(&mtd[1]); - + memset((char *)mtd,0, sizeof(struct mtd_info)); memset((char *)this, 0, sizeof(struct DiskOnChip)); @@ -281,13 +281,13 @@ static void __init DoC_Probe(unsigned long physadr) 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 @@ -331,7 +331,7 @@ static void __init DoC_Probe(unsigned long physadr) 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); |