diff options
Diffstat (limited to 'drivers/mtd/devices/docprobe.c')
| -rw-r--r-- | drivers/mtd/devices/docprobe.c | 325 |
1 files changed, 0 insertions, 325 deletions
diff --git a/drivers/mtd/devices/docprobe.c b/drivers/mtd/devices/docprobe.c deleted file mode 100644 index 88b3fd3e18a7..000000000000 --- a/drivers/mtd/devices/docprobe.c +++ /dev/null @@ -1,325 +0,0 @@ - -/* 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> */ - - -/* 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/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> - - -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 */ -#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; - -extern void DoC2k_init(struct mtd_info *); -extern void DoCMil_init(struct mtd_info *); -extern void DoCMilPlus_init(struct mtd_info *); - -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; - 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 = kzalloc(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]); - 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"; - initroutine = symbol_request(DoC2k_init); - break; - - case DOC_ChipID_Doc2k: - name="2000"; - initroutine = symbol_request(DoC2k_init); - break; - - case DOC_ChipID_DocMil: - name="Millennium"; -#ifdef DOC_SINGLE_DRIVER - initroutine = symbol_request(DoC2k_init); -#else - initroutine = symbol_request(DoCMil_init); -#endif /* DOC_SINGLE_DRIVER */ - break; - - case DOC_ChipID_DocMilPlus16: - case DOC_ChipID_DocMilPlus32: - name="MillenniumPlus"; - initroutine = symbol_request(DoCMilPlus_init); - break; - } - - 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"); - |