gdth.c

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/************************************************************************
 * Linux driver for                                                     *  
 * ICP vortex GmbH:    GDT ISA/EISA/PCI Disk Array Controllers          *
 * Intel Corporation:  Storage RAID Controllers                         *
 *                                                                      *
 * gdth.c                                                               *
 * Copyright (C) 1995-04 ICP vortex GmbH, Achim Leubner                 *
 * Copyright (C) 2002-04 Intel Corporation                              *
 * Copyright (C) 2003-04 Adaptec Inc.                                   *
 * <[e-mail]>                                          *
 *                                                                      *
 * Additions/Fixes:                                                     *
 * Boji Tony Kannanthanam <[e-mail]>               *
 * Johannes Dinner <[e-mail]>                        *
 *                                                                      *
 * This program is free software; you can redistribute it and/or modify *
 * it under the terms of the GNU General Public License as published    *
 * by the Free Software Foundation; either version 2 of the License,    *
 * or (at your option) any later version.                               *
 *                                                                      *
 * This program is distributed in the hope that it will be useful,      *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the         *
 * GNU General Public License for more details.                         *
 *                                                                      *
 * You should have received a copy of the GNU General Public License    *
 * along with this kernel; if not, write to the Free Software           *
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.            *
 *                                                                      *
 * Linux kernel 2.2.x, 2.4.x, 2.6.x supported                           *
 *                                                                      *
 * $Log: gdth.c,v $
 * Revision 1.73  2004/03/31 13:33:03  achim
 * Special command 0xfd implemented to detect 64-bit DMA support
 *
 * Revision 1.72  2004/03/17 08:56:04  achim
 * 64-bit DMA only enabled if FW >= x.43
 *
 * Revision 1.71  2004/03/05 15:51:29  achim
 * Screen service: separate message buffer, bugfixes
 *
 * Revision 1.70  2004/02/27 12:19:07  achim
 * Bugfix: Reset bit in config (0xfe) call removed
 *
 * Revision 1.69  2004/02/20 09:50:24  achim
 * Compatibility changes for kernels < 2.4.20
 * Bugfix screen service command size
 * pci_set_dma_mask() error handling added
 *
 * Revision 1.68  2004/02/19 15:46:54  achim
 * 64-bit DMA bugfixes
 * Drive size bugfix for drives > 1TB
 *
 * Revision 1.67  2004/01/14 13:11:57  achim
 * Tool access over /proc no longer supported
 * Bugfixes IOCTLs
 *
 * Revision 1.66  2003/12/19 15:04:06  achim
 * Bugfixes support for drives > 2TB
 *
 * Revision 1.65  2003/12/15 11:21:56  achim
 * 64-bit DMA support added
 * Support for drives > 2 TB implemented
 * Kernels 2.2.x, 2.4.x, 2.6.x supported
 *
 * Revision 1.64  2003/09/17 08:30:26  achim
 * EISA/ISA controller scan disabled
 * Command line switch probe_eisa_isa added
 *
 * Revision 1.63  2003/07/12 14:01:00  Daniele Bellucci <[e-mail]>
 * Minor cleanups in gdth_ioctl.
 *
 * Revision 1.62  2003/02/27 15:01:59  achim
 * Dynamic DMA mapping implemented
 * New (character device) IOCTL interface added
 * Other controller related changes made
 *
 * Revision 1.61  2002/11/08 13:09:52  boji
 * Added support for XSCALE based RAID Controllers
 * Fixed SCREENSERVICE initialization in SMP cases
 * Added checks for gdth_polling before GDTH_HA_LOCK
 *
 * Revision 1.60  2002/02/05 09:35:22  achim
 * MODULE_LICENSE only if kernel >= 2.4.11
 *
 * Revision 1.59  2002/01/30 09:46:33  achim
 * Small changes
 *
 * Revision 1.58  2002/01/29 15:30:02  achim
 * Set default value of shared_access to Y
 * New status S_CACHE_RESERV for clustering added
 *
 * Revision 1.57  2001/08/21 11:16:35  achim
 * Bugfix free_irq()
 *
 * Revision 1.56  2001/08/09 11:19:39  achim
 * Scsi_Host_Template changes
 *
 * Revision 1.55  2001/08/09 10:11:28  achim
 * Command HOST_UNFREEZE_IO before cache service init.
 *
 * Revision 1.54  2001/07/20 13:48:12  achim
 * Expand: gdth_analyse_hdrive() removed
 *
 * Revision 1.53  2001/07/17 09:52:49  achim
 * Small OEM related change
 *
 * Revision 1.52  2001/06/19 15:06:20  achim
 * New host command GDT_UNFREEZE_IO added
 *
 * Revision 1.51  2001/05/22 06:42:37  achim
 * PCI: Subdevice ID added
 *
 * Revision 1.50  2001/05/17 13:42:16  achim
 * Support for Intel Storage RAID Controllers added
 *
 * Revision 1.50  2001/05/17 12:12:34  achim
 * Support for Intel Storage RAID Controllers added
 *
 * Revision 1.49  2001/03/15 15:07:17  achim
 * New __setup interface for boot command line options added
 *
 * Revision 1.48  2001/02/06 12:36:28  achim
 * Bugfix Cluster protocol
 *
 * Revision 1.47  2001/01/10 14:42:06  achim
 * New switch shared_access added
 *
 * Revision 1.46  2001/01/09 08:11:35  achim
 * gdth_command() removed
 * meaning of Scsi_Pointer members changed
 *
 * Revision 1.45  2000/11/16 12:02:24  achim
 * Changes for kernel 2.4
 *
 * Revision 1.44  2000/10/11 08:44:10  achim
 * Clustering changes: New flag media_changed added
 *
 * Revision 1.43  2000/09/20 12:59:01  achim
 * DPMEM remap functions for all PCI controller types implemented
 * Small changes for ia64 platform
 *
 * Revision 1.42  2000/07/20 09:04:50  achim
 * Small changes for kernel 2.4
 *
 * Revision 1.41  2000/07/04 14:11:11  achim
 * gdth_analyse_hdrive() added to rescan drives after online expansion
 *
 * Revision 1.40  2000/06/27 11:24:16  achim
 * Changes Clustering, Screenservice
 *
 * Revision 1.39  2000/06/15 13:09:04  achim
 * Changes for gdth_do_cmd()
 *
 * Revision 1.38  2000/06/15 12:08:43  achim
 * Bugfix gdth_sync_event(), service SCREENSERVICE
 * Data direction for command 0xc2 changed to DOU
 *
 * Revision 1.37  2000/05/25 13:50:10  achim
 * New driver parameter virt_ctr added
 *
 * Revision 1.36  2000/05/04 08:50:46  achim
 * Event buffer now in gdth_ha_str
 *
 * Revision 1.35  2000/03/03 10:44:08  achim
 * New event_string only valid for the RP controller family
 *
 * Revision 1.34  2000/03/02 14:55:29  achim
 * New mechanism for async. event handling implemented
 *
 * Revision 1.33  2000/02/21 15:37:37  achim
 * Bugfix Alpha platform + DPMEM above 4GB
 *
 * Revision 1.32  2000/02/14 16:17:37  achim
 * Bugfix sense_buffer[] + raw devices
 *
 * Revision 1.31  2000/02/10 10:29:00  achim
 * Delete sense_buffer[0], if command OK
 *
 * Revision 1.30  1999/11/02 13:42:39  achim
 * ARRAY_DRV_LIST2 implemented
 * Now 255 log. and 100 host drives supported
 *
 * Revision 1.29  1999/10/05 13:28:47  achim
 * GDT_CLUST_RESET added
 *
 * Revision 1.28  1999/08/12 13:44:54  achim
 * MOUNTALL removed
 * Cluster drives -> removeable drives
 *
 * Revision 1.27  1999/06/22 07:22:38  achim
 * Small changes
 *
 * Revision 1.26  1999/06/10 16:09:12  achim
 * Cluster Host Drive support: Bugfixes
 *
 * Revision 1.25  1999/06/01 16:03:56  achim
 * gdth_init_pci(): Manipulate config. space to start RP controller
 *
 * Revision 1.24  1999/05/26 11:53:06  achim
 * Cluster Host Drive support added
 *
 * Revision 1.23  1999/03/26 09:12:31  achim
 * Default value for hdr_channel set to 0
 *
 * Revision 1.22  1999/03/22 16:27:16  achim
 * Bugfix: gdth_store_event() must not be locked with GDTH_LOCK_HA()
 *
 * Revision 1.21  1999/03/16 13:40:34  achim
 * Problems with reserved drives solved
 * gdth_eh_bus_reset() implemented
 *
 * Revision 1.20  1999/03/10 09:08:13  achim
 * Bugfix: Corrections in gdth_direction_tab[] made
 * Bugfix: Increase command timeout (gdth_update_timeout()) NOT in gdth_putq()
 *
 * Revision 1.19  1999/03/05 14:38:16  achim
 * Bugfix: Heads/Sectors mapping for reserved devices possibly wrong
 * -> gdth_eval_mapping() implemented, changes in gdth_bios_param()
 * INIT_RETRIES set to 100s to avoid DEINIT-Timeout for controllers
 * with BIOS disabled and memory test set to Intensive
 * Enhanced /proc support
 *
 * Revision 1.18  1999/02/24 09:54:33  achim
 * Command line parameter hdr_channel implemented
 * Bugfix for EISA controllers + Linux 2.2.x
 *
 * Revision 1.17  1998/12/17 15:58:11  achim
 * Command line parameters implemented
 * Changes for Alpha platforms
 * PCI controller scan changed
 * SMP support improved (spin_lock_irqsave(),...)
 * New async. events, new scan/reserve commands included
 *
 * Revision 1.16  1998/09/28 16:08:46  achim
 * GDT_PCIMPR: DPMEM remapping, if required
 * mdelay() added
 *
 * Revision 1.15  1998/06/03 14:54:06  achim
 * gdth_delay(), gdth_flush() implemented
 * Bugfix: gdth_release() changed
 *
 * Revision 1.14  1998/05/22 10:01:17  achim
 * mj: pcibios_strerror() removed
 * Improved SMP support (if version >= 2.1.95)
 * gdth_halt(): halt_called flag added (if version < 2.1)
 *
 * Revision 1.13  1998/04/16 09:14:57  achim
 * Reserve drives (for raw service) implemented
 * New error handling code enabled
 * Get controller name from board_info() IOCTL
 * Final round of PCI device driver patches by Martin Mares
 *
 * Revision 1.12  1998/03/03 09:32:37  achim
 * Fibre channel controller support added
 *
 * Revision 1.11  1998/01/27 16:19:14  achim
 * SA_SHIRQ added
 * add_timer()/del_timer() instead of GDTH_TIMER
 * scsi_add_timer()/scsi_del_timer() instead of SCSI_TIMER
 * New error handling included
 *
 * Revision 1.10  1997/10/31 12:29:57  achim
 * Read heads/sectors from host drive
 *
 * Revision 1.9  1997/09/04 10:07:25  achim
 * IO-mapping with virt_to_bus(), gdth_readb(), gdth_writeb(), ...
 * register_reboot_notifier() to get a notify on shutown used
 *
 * Revision 1.8  1997/04/02 12:14:30  achim
 * Version 1.00 (see gdth.h), tested with kernel 2.0.29
 *
 * Revision 1.7  1997/03/12 13:33:37  achim
 * gdth_reset() changed, new async. events
 *
 * Revision 1.6  1997/03/04 14:01:11  achim
 * Shutdown routine gdth_halt() implemented
 *
 * Revision 1.5  1997/02/21 09:08:36  achim
 * New controller included (RP, RP1, RP2 series)
 * IOCTL interface implemented
 *
 * Revision 1.4  1996/07/05 12:48:55  achim
 * Function gdth_bios_param() implemented
 * New constant GDTH_MAXC_P_L inserted
 * GDT_WRITE_THR, GDT_EXT_INFO implemented
 * Function gdth_reset() changed
 *
 * Revision 1.3  1996/05/10 09:04:41  achim
 * Small changes for Linux 1.2.13
 *
 * Revision 1.2  1996/05/09 12:45:27  achim
 * Loadable module support implemented
 * /proc support corrections made
 *
 * Revision 1.1  1996/04/11 07:35:57  achim
 * Initial revision
 *
 ************************************************************************/

/* All GDT Disk Array Controllers are fully supported by this driver.
 * This includes the PCI/EISA/ISA SCSI Disk Array Controllers and the
 * PCI Fibre Channel Disk Array Controllers. See gdth.h for a complete
 * list of all controller types.
 * 
 * If you have one or more GDT3000/3020 EISA controllers with 
 * controller BIOS disabled, you have to set the IRQ values with the 
 * command line option "gdth=irq1,irq2,...", where the irq1,irq2,... are
 * the IRQ values for the EISA controllers.
 * 
 * After the optional list of IRQ values, other possible 
 * command line options are:
 * disable:Y                    disable driver
 * disable:N                    enable driver
 * reserve_mode:0               reserve no drives for the raw service
 * reserve_mode:1               reserve all not init., removable drives
 * reserve_mode:2               reserve all not init. drives
 * reserve_list:h,b,t,l,h,b,t,l,...     reserve particular drive(s) with 
 *                              h- controller no., b- channel no., 
 *                              t- target ID, l- LUN
 * reverse_scan:Y               reverse scan order for PCI controllers         
 * reverse_scan:N               scan PCI controllers like BIOS
 * max_ids:x                    x - target ID count per channel (1..MAXID)
 * rescan:Y                     rescan all channels/IDs 
 * rescan:N                     use all devices found until now
 * virt_ctr:Y                   map every channel to a virtual controller 
 * virt_ctr:N                   use multi channel support 
 * hdr_channel:x                x - number of virtual bus for host drives
 * shared_access:Y              disable driver reserve/release protocol to 
 *                              access a shared resource from several nodes, 
 *                              appropiate controller firmware required
 * shared_access:N              enable driver reserve/release protocol
 * probe_eisa_isa:Y             scan for EISA/ISA controllers
 * probe_eisa_isa:N             do not scan for EISA/ISA controllers
 * force_dma32:Y                use only 32 bit DMA mode
 * force_dma32:N                use 64 bit DMA mode, if supported
 *
 * The default values are: "gdth=disable:N,reserve_mode:1,reverse_scan:N,
 *                          max_ids:127,rescan:N,virt_ctr:N,hdr_channel:0,
 *                          shared_access:Y,probe_eisa_isa:N,force_dma32:N".
 * Here is another example: "gdth=reserve_list:0,1,2,0,0,1,3,0,rescan:Y".
 * 
 * When loading the gdth driver as a module, the same options are available. 
 * You can set the IRQs with "IRQ=...". However, the syntax to specify the
 * options changes slightly. You must replace all ',' between options 
 * with ' ' and all ':' with '=' and you must use 
 * '1' in place of 'Y' and '0' in place of 'N'.
 * 
 * Default: "modprobe gdth disable=0 reserve_mode=1 reverse_scan=0
 *           max_ids=127 rescan=0 virt_ctr=0 hdr_channel=0 shared_access=0 
 *           probe_eisa_isa=0 force_dma32=0"
 * The other example: "modprobe gdth reserve_list=0,1,2,0,0,1,3,0 rescan=1".
 */

/* The meaning of the Scsi_Pointer members in this driver is as follows:
 * ptr:                     Chaining
 * this_residual:           Command priority
 * buffer:                  phys. DMA sense buffer 
 * dma_handle:              phys. DMA buffer (kernel >= 2.4.0)
 * buffers_residual:        Timeout value
 * Status:                  Command status (gdth_do_cmd()), DMA mem. mappings
 * Message:                 Additional info (gdth_do_cmd()), DMA direction
 * have_data_in:            Flag for gdth_wait_completion()