Creation of Cybook 2416 (actually Gen4) repository
This commit is contained in:
mlt
348
drivers/mtd/devices/docprobe.c
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348
drivers/mtd/devices/docprobe.c
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/* Linux driver for Disk-On-Chip devices */
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/* Probe routines common to all DoC devices */
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/* (C) 1999 Machine Vision Holdings, Inc. */
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/* (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> */
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/* $Id: docprobe.c,v 1.1.1.1 2007/06/12 07:27:09 eyryu Exp $ */
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/* DOC_PASSIVE_PROBE:
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In order to ensure that the BIOS checksum is correct at boot time, and
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hence that the onboard BIOS extension gets executed, the DiskOnChip
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goes into reset mode when it is read sequentially: all registers
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return 0xff until the chip is woken up again by writing to the
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DOCControl register.
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Unfortunately, this means that the probe for the DiskOnChip is unsafe,
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because one of the first things it does is write to where it thinks
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the DOCControl register should be - which may well be shared memory
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for another device. I've had machines which lock up when this is
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attempted. Hence the possibility to do a passive probe, which will fail
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to detect a chip in reset mode, but is at least guaranteed not to lock
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the machine.
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If you have this problem, uncomment the following line:
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#define DOC_PASSIVE_PROBE
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*/
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/* DOC_SINGLE_DRIVER:
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Millennium driver has been merged into DOC2000 driver.
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The old Millennium-only driver has been retained just in case there
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are problems with the new code. If the combined driver doesn't work
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for you, you can try the old one by undefining DOC_SINGLE_DRIVER
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below and also enabling it in your configuration. If this fixes the
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problems, please send a report to the MTD mailing list at
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<linux-mtd@lists.infradead.org>.
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*/
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#define DOC_SINGLE_DRIVER
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <asm/errno.h>
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#include <asm/io.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/doc2000.h>
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#include <linux/mtd/compatmac.h>
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/* Where to look for the devices? */
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#ifndef CONFIG_MTD_DOCPROBE_ADDRESS
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#define CONFIG_MTD_DOCPROBE_ADDRESS 0
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#endif
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static unsigned long doc_config_location = CONFIG_MTD_DOCPROBE_ADDRESS;
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module_param(doc_config_location, ulong, 0);
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MODULE_PARM_DESC(doc_config_location, "Physical memory address at which to probe for DiskOnChip");
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static unsigned long __initdata doc_locations[] = {
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#if defined (__alpha__) || defined(__i386__) || defined(__x86_64__)
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#ifdef CONFIG_MTD_DOCPROBE_HIGH
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0xfffc8000, 0xfffca000, 0xfffcc000, 0xfffce000,
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0xfffd0000, 0xfffd2000, 0xfffd4000, 0xfffd6000,
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0xfffd8000, 0xfffda000, 0xfffdc000, 0xfffde000,
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0xfffe0000, 0xfffe2000, 0xfffe4000, 0xfffe6000,
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0xfffe8000, 0xfffea000, 0xfffec000, 0xfffee000,
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#else /* CONFIG_MTD_DOCPROBE_HIGH */
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0xc8000, 0xca000, 0xcc000, 0xce000,
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0xd0000, 0xd2000, 0xd4000, 0xd6000,
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0xd8000, 0xda000, 0xdc000, 0xde000,
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0xe0000, 0xe2000, 0xe4000, 0xe6000,
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0xe8000, 0xea000, 0xec000, 0xee000,
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#endif /* CONFIG_MTD_DOCPROBE_HIGH */
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#elif defined(__PPC__)
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0xe4000000,
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#elif defined(CONFIG_MOMENCO_OCELOT)
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0x2f000000,
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0xff000000,
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#elif defined(CONFIG_MOMENCO_OCELOT_G) || defined (CONFIG_MOMENCO_OCELOT_C)
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0xff000000,
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##else
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#warning Unknown architecture for DiskOnChip. No default probe locations defined
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#endif
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0xffffffff };
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/* doccheck: Probe a given memory window to see if there's a DiskOnChip present */
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static inline int __init doccheck(void __iomem *potential, unsigned long physadr)
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{
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void __iomem *window=potential;
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unsigned char tmp, tmpb, tmpc, ChipID;
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#ifndef DOC_PASSIVE_PROBE
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unsigned char tmp2;
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#endif
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/* Routine copied from the Linux DOC driver */
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#ifdef CONFIG_MTD_DOCPROBE_55AA
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/* Check for 0x55 0xAA signature at beginning of window,
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this is no longer true once we remove the IPL (for Millennium */
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if (ReadDOC(window, Sig1) != 0x55 || ReadDOC(window, Sig2) != 0xaa)
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return 0;
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#endif /* CONFIG_MTD_DOCPROBE_55AA */
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#ifndef DOC_PASSIVE_PROBE
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/* It's not possible to cleanly detect the DiskOnChip - the
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* bootup procedure will put the device into reset mode, and
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* it's not possible to talk to it without actually writing
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* to the DOCControl register. So we store the current contents
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* of the DOCControl register's location, in case we later decide
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* that it's not a DiskOnChip, and want to put it back how we
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* found it.
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*/
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tmp2 = ReadDOC(window, DOCControl);
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/* Reset the DiskOnChip ASIC */
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WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
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window, DOCControl);
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WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
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window, DOCControl);
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/* Enable the DiskOnChip ASIC */
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WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
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window, DOCControl);
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WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
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window, DOCControl);
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#endif /* !DOC_PASSIVE_PROBE */
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/* We need to read the ChipID register four times. For some
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newer DiskOnChip 2000 units, the first three reads will
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return the DiskOnChip Millennium ident. Don't ask. */
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ChipID = ReadDOC(window, ChipID);
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switch (ChipID) {
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case DOC_ChipID_Doc2k:
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/* Check the TOGGLE bit in the ECC register */
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tmp = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
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tmpb = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
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tmpc = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
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if (tmp != tmpb && tmp == tmpc)
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return ChipID;
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break;
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case DOC_ChipID_DocMil:
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/* Check for the new 2000 with Millennium ASIC */
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ReadDOC(window, ChipID);
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ReadDOC(window, ChipID);
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if (ReadDOC(window, ChipID) != DOC_ChipID_DocMil)
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ChipID = DOC_ChipID_Doc2kTSOP;
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/* Check the TOGGLE bit in the ECC register */
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tmp = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
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tmpb = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
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tmpc = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
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if (tmp != tmpb && tmp == tmpc)
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return ChipID;
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break;
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case DOC_ChipID_DocMilPlus16:
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case DOC_ChipID_DocMilPlus32:
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case 0:
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/* Possible Millennium+, need to do more checks */
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#ifndef DOC_PASSIVE_PROBE
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/* Possibly release from power down mode */
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for (tmp = 0; (tmp < 4); tmp++)
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ReadDOC(window, Mplus_Power);
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/* Reset the DiskOnChip ASIC */
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tmp = DOC_MODE_RESET | DOC_MODE_MDWREN | DOC_MODE_RST_LAT |
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DOC_MODE_BDECT;
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WriteDOC(tmp, window, Mplus_DOCControl);
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WriteDOC(~tmp, window, Mplus_CtrlConfirm);
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mdelay(1);
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/* Enable the DiskOnChip ASIC */
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tmp = DOC_MODE_NORMAL | DOC_MODE_MDWREN | DOC_MODE_RST_LAT |
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DOC_MODE_BDECT;
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WriteDOC(tmp, window, Mplus_DOCControl);
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WriteDOC(~tmp, window, Mplus_CtrlConfirm);
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mdelay(1);
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#endif /* !DOC_PASSIVE_PROBE */
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ChipID = ReadDOC(window, ChipID);
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switch (ChipID) {
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case DOC_ChipID_DocMilPlus16:
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case DOC_ChipID_DocMilPlus32:
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/* Check the TOGGLE bit in the toggle register */
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tmp = ReadDOC(window, Mplus_Toggle) & DOC_TOGGLE_BIT;
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tmpb = ReadDOC(window, Mplus_Toggle) & DOC_TOGGLE_BIT;
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tmpc = ReadDOC(window, Mplus_Toggle) & DOC_TOGGLE_BIT;
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if (tmp != tmpb && tmp == tmpc)
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return ChipID;
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default:
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break;
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}
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/* FALL TRHU */
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default:
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#ifdef CONFIG_MTD_DOCPROBE_55AA
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printk(KERN_DEBUG "Possible DiskOnChip with unknown ChipID %2.2X found at 0x%lx\n",
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ChipID, physadr);
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#endif
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#ifndef DOC_PASSIVE_PROBE
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/* Put back the contents of the DOCControl register, in case it's not
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* actually a DiskOnChip.
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*/
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WriteDOC(tmp2, window, DOCControl);
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#endif
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return 0;
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}
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printk(KERN_WARNING "DiskOnChip failed TOGGLE test, dropping.\n");
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#ifndef DOC_PASSIVE_PROBE
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/* Put back the contents of the DOCControl register: it's not a DiskOnChip */
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WriteDOC(tmp2, window, DOCControl);
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#endif
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return 0;
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}
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static int docfound;
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extern void DoC2k_init(struct mtd_info *);
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extern void DoCMil_init(struct mtd_info *);
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extern void DoCMilPlus_init(struct mtd_info *);
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static void __init DoC_Probe(unsigned long physadr)
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{
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void __iomem *docptr;
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struct DiskOnChip *this;
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struct mtd_info *mtd;
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int ChipID;
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char namebuf[15];
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char *name = namebuf;
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void (*initroutine)(struct mtd_info *) = NULL;
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docptr = ioremap(physadr, DOC_IOREMAP_LEN);
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if (!docptr)
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return;
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if ((ChipID = doccheck(docptr, physadr))) {
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if (ChipID == DOC_ChipID_Doc2kTSOP) {
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/* Remove this at your own peril. The hardware driver works but nothing prevents you from erasing bad blocks */
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printk(KERN_NOTICE "Refusing to drive DiskOnChip 2000 TSOP until Bad Block Table is correctly supported by INFTL\n");
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iounmap(docptr);
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return;
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}
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docfound = 1;
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mtd = kmalloc(sizeof(struct DiskOnChip) + sizeof(struct mtd_info), GFP_KERNEL);
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if (!mtd) {
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printk(KERN_WARNING "Cannot allocate memory for data structures. Dropping.\n");
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iounmap(docptr);
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return;
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}
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this = (struct DiskOnChip *)(&mtd[1]);
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memset((char *)mtd,0, sizeof(struct mtd_info));
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memset((char *)this, 0, sizeof(struct DiskOnChip));
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mtd->priv = this;
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this->virtadr = docptr;
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this->physadr = physadr;
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this->ChipID = ChipID;
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sprintf(namebuf, "with ChipID %2.2X", ChipID);
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switch(ChipID) {
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case DOC_ChipID_Doc2kTSOP:
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name="2000 TSOP";
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initroutine = symbol_request(DoC2k_init);
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break;
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case DOC_ChipID_Doc2k:
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name="2000";
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initroutine = symbol_request(DoC2k_init);
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break;
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case DOC_ChipID_DocMil:
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name="Millennium";
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#ifdef DOC_SINGLE_DRIVER
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initroutine = symbol_request(DoC2k_init);
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#else
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initroutine = symbol_request(DoCMil_init);
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#endif /* DOC_SINGLE_DRIVER */
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break;
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case DOC_ChipID_DocMilPlus16:
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case DOC_ChipID_DocMilPlus32:
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name="MillenniumPlus";
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initroutine = symbol_request(DoCMilPlus_init);
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break;
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}
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if (initroutine) {
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(*initroutine)(mtd);
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symbol_put_addr(initroutine);
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return;
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}
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printk(KERN_NOTICE "Cannot find driver for DiskOnChip %s at 0x%lX\n", name, physadr);
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kfree(mtd);
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}
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iounmap(docptr);
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}
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/****************************************************************************
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*
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* Module stuff
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*
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****************************************************************************/
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static int __init init_doc(void)
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{
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int i;
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if (doc_config_location) {
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printk(KERN_INFO "Using configured DiskOnChip probe address 0x%lx\n", doc_config_location);
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DoC_Probe(doc_config_location);
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} else {
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for (i=0; (doc_locations[i] != 0xffffffff); i++) {
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DoC_Probe(doc_locations[i]);
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}
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}
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/* No banner message any more. Print a message if no DiskOnChip
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found, so the user knows we at least tried. */
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if (!docfound)
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printk(KERN_INFO "No recognised DiskOnChip devices found\n");
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return -EAGAIN;
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}
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module_init(init_doc);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
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MODULE_DESCRIPTION("Probe code for DiskOnChip 2000 and Millennium devices");
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