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linux/drivers/scsi/ibmmca.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

2508 lines
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/*
Low Level Linux Driver for the IBM Microchannel SCSI Subsystem for
Linux Kernel >= 2.4.0.
Copyright (c) 1995 Strom Systems, Inc. under the terms of the GNU
General Public License. Written by Martin Kolinek, December 1995.
Further development by: Chris Beauregard, Klaus Kudielka, Michael Lang
See the file Documentation/scsi/ibmmca.txt for a detailed description
of this driver, the commandline arguments and the history of its
development.
See the WWW-page: http://www.uni-mainz.de/~langm000/linux.html for latest
updates, info and ADF-files for adapters supported by this driver.
Alan Cox <alan@redhat.com>
Updated for Linux 2.5.45 to use the new error handler, cleaned up the
lock macros and did a few unavoidable locking tweaks, plus one locking
fix in the irq and completion path.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/blkdev.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/mca.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/mca-legacy.h>
#include <asm/system.h>
#include <asm/io.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#include "ibmmca.h"
/* current version of this driver-source: */
#define IBMMCA_SCSI_DRIVER_VERSION "4.0b-ac"
/* driver configuration */
#define IM_MAX_HOSTS 8 /* maximum number of host adapters */
#define IM_RESET_DELAY 60 /* seconds allowed for a reset */
/* driver debugging - #undef all for normal operation */
/* if defined: count interrupts and ignore this special one: */
#undef IM_DEBUG_TIMEOUT //50
#define TIMEOUT_PUN 0
#define TIMEOUT_LUN 0
/* verbose interrupt: */
#undef IM_DEBUG_INT
/* verbose queuecommand: */
#undef IM_DEBUG_CMD
/* verbose queucommand for specific SCSI-device type: */
#undef IM_DEBUG_CMD_SPEC_DEV
/* verbose device probing */
#undef IM_DEBUG_PROBE
/* device type that shall be displayed on syslog (only during debugging): */
#define IM_DEBUG_CMD_DEVICE TYPE_TAPE
/* relative addresses of hardware registers on a subsystem */
#define IM_CMD_REG(hi) (hosts[(hi)]->io_port) /*Command Interface, (4 bytes long) */
#define IM_ATTN_REG(hi) (hosts[(hi)]->io_port+4) /*Attention (1 byte) */
#define IM_CTR_REG(hi) (hosts[(hi)]->io_port+5) /*Basic Control (1 byte) */
#define IM_INTR_REG(hi) (hosts[(hi)]->io_port+6) /*Interrupt Status (1 byte, r/o) */
#define IM_STAT_REG(hi) (hosts[(hi)]->io_port+7) /*Basic Status (1 byte, read only) */
/* basic I/O-port of first adapter */
#define IM_IO_PORT 0x3540
/* maximum number of hosts that can be found */
#define IM_N_IO_PORT 8
/*requests going into the upper nibble of the Attention register */
/*note: the lower nibble specifies the device(0-14), or subsystem(15) */
#define IM_IMM_CMD 0x10 /*immediate command */
#define IM_SCB 0x30 /*Subsystem Control Block command */
#define IM_LONG_SCB 0x40 /*long Subsystem Control Block command */
#define IM_EOI 0xe0 /*end-of-interrupt request */
/*values for bits 7,1,0 of Basic Control reg. (bits 6-2 reserved) */
#define IM_HW_RESET 0x80 /*hardware reset */
#define IM_ENABLE_DMA 0x02 /*enable subsystem's busmaster DMA */
#define IM_ENABLE_INTR 0x01 /*enable interrupts to the system */
/*to interpret the upper nibble of Interrupt Status register */
/*note: the lower nibble specifies the device(0-14), or subsystem(15) */
#define IM_SCB_CMD_COMPLETED 0x10
#define IM_SCB_CMD_COMPLETED_WITH_RETRIES 0x50
#define IM_LOOP_SCATTER_BUFFER_FULL 0x60
#define IM_ADAPTER_HW_FAILURE 0x70
#define IM_IMMEDIATE_CMD_COMPLETED 0xa0
#define IM_CMD_COMPLETED_WITH_FAILURE 0xc0
#define IM_CMD_ERROR 0xe0
#define IM_SOFTWARE_SEQUENCING_ERROR 0xf0
/*to interpret bits 3-0 of Basic Status register (bits 7-4 reserved) */
#define IM_CMD_REG_FULL 0x08
#define IM_CMD_REG_EMPTY 0x04
#define IM_INTR_REQUEST 0x02
#define IM_BUSY 0x01
/*immediate commands (word written into low 2 bytes of command reg) */
#define IM_RESET_IMM_CMD 0x0400
#define IM_FEATURE_CTR_IMM_CMD 0x040c
#define IM_DMA_PACING_IMM_CMD 0x040d
#define IM_ASSIGN_IMM_CMD 0x040e
#define IM_ABORT_IMM_CMD 0x040f
#define IM_FORMAT_PREP_IMM_CMD 0x0417
/*SCB (Subsystem Control Block) structure */
struct im_scb {
unsigned short command; /*command word (read, etc.) */
unsigned short enable; /*enable word, modifies cmd */
union {
unsigned long log_blk_adr; /*block address on SCSI device */
unsigned char scsi_cmd_length; /*6,10,12, for other scsi cmd */
} u1;
unsigned long sys_buf_adr; /*physical system memory adr */
unsigned long sys_buf_length; /*size of sys mem buffer */
unsigned long tsb_adr; /*Termination Status Block adr */
unsigned long scb_chain_adr; /*optional SCB chain address */
union {
struct {
unsigned short count; /*block count, on SCSI device */
unsigned short length; /*block length, on SCSI device */
} blk;
unsigned char scsi_command[12]; /*other scsi command */
} u2;
};
/*structure scatter-gather element (for list of system memory areas) */
struct im_sge {
void *address;
unsigned long byte_length;
};
/*structure returned by a get_pos_info command: */
struct im_pos_info {
unsigned short pos_id; /* adapter id */
unsigned char pos_3a; /* pos 3 (if pos 6 = 0) */
unsigned char pos_2; /* pos 2 */
unsigned char int_level; /* interrupt level IRQ 11 or 14 */
unsigned char pos_4a; /* pos 4 (if pos 6 = 0) */
unsigned short connector_size; /* MCA connector size: 16 or 32 Bit */
unsigned char num_luns; /* number of supported luns per device */
unsigned char num_puns; /* number of supported puns */
unsigned char pacing_factor; /* pacing factor */
unsigned char num_ldns; /* number of ldns available */
unsigned char eoi_off; /* time EOI and interrupt inactive */
unsigned char max_busy; /* time between reset and busy on */
unsigned short cache_stat; /* ldn cachestat. Bit=1 = not cached */
unsigned short retry_stat; /* retry status of ldns. Bit=1=disabled */
unsigned char pos_4b; /* pos 4 (if pos 6 = 1) */
unsigned char pos_3b; /* pos 3 (if pos 6 = 1) */
unsigned char pos_6; /* pos 6 */
unsigned char pos_5; /* pos 5 */
unsigned short max_overlap; /* maximum overlapping requests */
unsigned short num_bus; /* number of SCSI-busses */
};
/*values for SCB command word */
#define IM_NO_SYNCHRONOUS 0x0040 /*flag for any command */
#define IM_NO_DISCONNECT 0x0080 /*flag for any command */
#define IM_READ_DATA_CMD 0x1c01
#define IM_WRITE_DATA_CMD 0x1c02
#define IM_READ_VERIFY_CMD 0x1c03
#define IM_WRITE_VERIFY_CMD 0x1c04
#define IM_REQUEST_SENSE_CMD 0x1c08
#define IM_READ_CAPACITY_CMD 0x1c09
#define IM_DEVICE_INQUIRY_CMD 0x1c0b
#define IM_READ_LOGICAL_CMD 0x1c2a
#define IM_OTHER_SCSI_CMD_CMD 0x241f
/* unused, but supported, SCB commands */
#define IM_GET_COMMAND_COMPLETE_STATUS_CMD 0x1c07 /* command status */
#define IM_GET_POS_INFO_CMD 0x1c0a /* returns neat stuff */
#define IM_READ_PREFETCH_CMD 0x1c31 /* caching controller only */
#define IM_FOMAT_UNIT_CMD 0x1c16 /* format unit */
#define IM_REASSIGN_BLOCK_CMD 0x1c18 /* in case of error */
/*values to set bits in the enable word of SCB */
#define IM_READ_CONTROL 0x8000
#define IM_REPORT_TSB_ONLY_ON_ERROR 0x4000
#define IM_RETRY_ENABLE 0x2000
#define IM_POINTER_TO_LIST 0x1000
#define IM_SUPRESS_EXCEPTION_SHORT 0x0400
#define IM_BYPASS_BUFFER 0x0200
#define IM_CHAIN_ON_NO_ERROR 0x0001
/*TSB (Termination Status Block) structure */
struct im_tsb {
unsigned short end_status;
unsigned short reserved1;
unsigned long residual_byte_count;
unsigned long sg_list_element_adr;
unsigned short status_length;
unsigned char dev_status;
unsigned char cmd_status;
unsigned char dev_error;
unsigned char cmd_error;
unsigned short reserved2;
unsigned short reserved3;
unsigned short low_of_last_scb_adr;
unsigned short high_of_last_scb_adr;
};
/*subsystem uses interrupt request level 14 */
#define IM_IRQ 14
/*SCSI-2 F/W may evade to interrupt 11 */
#define IM_IRQ_FW 11
/* Model 95 has an additional alphanumeric display, which can be used
to display SCSI-activities. 8595 models do not have any disk led, which
makes this feature quite useful.
The regular PS/2 disk led is turned on/off by bits 6,7 of system
control port. */
/* LED display-port (actually, last LED on display) */
#define MOD95_LED_PORT 0x108
/* system-control-register of PS/2s with diskindicator */
#define PS2_SYS_CTR 0x92
/* activity displaying methods */
#define LED_DISP 1
#define LED_ADISP 2
#define LED_ACTIVITY 4
/* failed intr */
#define CMD_FAIL 255
/* The SCSI-ID(!) of the accessed SCSI-device is shown on PS/2-95 machines' LED
displays. ldn is no longer displayed here, because the ldn mapping is now
done dynamically and the ldn <-> pun,lun maps can be looked-up at boottime
or during uptime in /proc/scsi/ibmmca/<host_no> in case of trouble,
interest, debugging or just for having fun. The left number gives the
host-adapter number and the right shows the accessed SCSI-ID. */
/* display_mode is set by the ibmmcascsi= command line arg */
static int display_mode = 0;
/* set default adapter timeout */
static unsigned int adapter_timeout = 45;
/* for probing on feature-command: */
static unsigned int global_command_error_excuse = 0;
/* global setting by command line for adapter_speed */
static int global_adapter_speed = 0; /* full speed by default */
/* Panel / LED on, do it right for F/W addressin, too. adisplay will
* just ignore ids>7, as the panel has only 7 digits available */
#define PS2_DISK_LED_ON(ad,id) { if (display_mode & LED_DISP) { if (id>9) \
outw((ad+48)|((id+55)<<8), MOD95_LED_PORT ); else \
outw((ad+48)|((id+48)<<8), MOD95_LED_PORT ); } else \
if (display_mode & LED_ADISP) { if (id<7) outb((char)(id+48),MOD95_LED_PORT+1+id); \
outb((char)(ad+48), MOD95_LED_PORT); } \
if ((display_mode & LED_ACTIVITY)||(!display_mode)) \
outb(inb(PS2_SYS_CTR) | 0xc0, PS2_SYS_CTR); }
/* Panel / LED off */
/* bug fixed, Dec 15, 1997, where | was replaced by & here */
#define PS2_DISK_LED_OFF() { if (display_mode & LED_DISP) \
outw(0x2020, MOD95_LED_PORT ); else if (display_mode & LED_ADISP) { \
outl(0x20202020,MOD95_LED_PORT); outl(0x20202020,MOD95_LED_PORT+4); } \
if ((display_mode & LED_ACTIVITY)||(!display_mode)) \
outb(inb(PS2_SYS_CTR) & 0x3f, PS2_SYS_CTR); }
/*list of supported subsystems */
struct subsys_list_struct {
unsigned short mca_id;
char *description;
};
/* types of different supported hardware that goes to hostdata special */
#define IBM_SCSI2_FW 0
#define IBM_7568_WCACHE 1
#define IBM_EXP_UNIT 2
#define IBM_SCSI_WCACHE 3
#define IBM_SCSI 4
/* other special flags for hostdata structure */
#define FORCED_DETECTION 100
#define INTEGRATED_SCSI 101
/* List of possible IBM-SCSI-adapters */
static struct subsys_list_struct subsys_list[] = {
{0x8efc, "IBM SCSI-2 F/W Adapter"}, /* special = 0 */
{0x8efd, "IBM 7568 Industrial Computer SCSI Adapter w/Cache"}, /* special = 1 */
{0x8ef8, "IBM Expansion Unit SCSI Controller"}, /* special = 2 */
{0x8eff, "IBM SCSI Adapter w/Cache"}, /* special = 3 */
{0x8efe, "IBM SCSI Adapter"}, /* special = 4 */
};
/* Max number of logical devices (can be up from 0 to 14). 15 is the address
of the adapter itself. */
#define MAX_LOG_DEV 15
/*local data for a logical device */
struct logical_device {
struct im_scb scb; /* SCSI-subsystem-control-block structure */
struct im_tsb tsb; /* SCSI command complete status block structure */
struct im_sge sge[16]; /* scatter gather list structure */
unsigned char buf[256]; /* SCSI command return data buffer */
Scsi_Cmnd *cmd; /* SCSI-command that is currently in progress */
int device_type; /* type of the SCSI-device. See include/scsi/scsi.h
for interpretation of the possible values */
int block_length; /* blocksize of a particular logical SCSI-device */
int cache_flag; /* 1 if this is uncached, 0 if cache is present for ldn */
int retry_flag; /* 1 if adapter retry is disabled, 0 if enabled */
};
/* statistics of the driver during operations (for proc_info) */
struct Driver_Statistics {
/* SCSI statistics on the adapter */
int ldn_access[MAX_LOG_DEV + 1]; /* total accesses on a ldn */
int ldn_read_access[MAX_LOG_DEV + 1]; /* total read-access on a ldn */
int ldn_write_access[MAX_LOG_DEV + 1]; /* total write-access on a ldn */
int ldn_inquiry_access[MAX_LOG_DEV + 1]; /* total inquiries on a ldn */
int ldn_modeselect_access[MAX_LOG_DEV + 1]; /* total mode selects on ldn */
int scbs; /* short SCBs queued */
int long_scbs; /* long SCBs queued */
int total_accesses; /* total accesses on all ldns */
int total_interrupts; /* total interrupts (should be
same as total_accesses) */
int total_errors; /* command completed with error */
/* dynamical assignment statistics */
int total_scsi_devices; /* number of physical pun,lun */
int dyn_flag; /* flag showing dynamical mode */
int dynamical_assignments; /* number of remappings of ldns */
int ldn_assignments[MAX_LOG_DEV + 1]; /* number of remappings of each
ldn */
};
/* data structure for each host adapter */
struct ibmmca_hostdata {
/* array of logical devices: */
struct logical_device _ld[MAX_LOG_DEV + 1];
/* array to convert (pun, lun) into logical device number: */
unsigned char _get_ldn[16][8];
/*array that contains the information about the physical SCSI-devices
attached to this host adapter: */
unsigned char _get_scsi[16][8];
/* used only when checking logical devices: */
int _local_checking_phase_flag;
/* report received interrupt: */
int _got_interrupt;
/* report termination-status of SCSI-command: */
int _stat_result;
/* reset status (used only when doing reset): */
int _reset_status;
/* code of the last SCSI command (needed for panic info): */
int _last_scsi_command[MAX_LOG_DEV + 1];
/* identifier of the last SCSI-command type */
int _last_scsi_type[MAX_LOG_DEV + 1];
/* last blockcount */
int _last_scsi_blockcount[MAX_LOG_DEV + 1];
/* last locgical block address */
unsigned long _last_scsi_logical_block[MAX_LOG_DEV + 1];
/* Counter that points on the next reassignable ldn for dynamical
remapping. The default value is 7, that is the first reassignable
number in the list at boottime: */
int _next_ldn;
/* Statistics-structure for this IBM-SCSI-host: */
struct Driver_Statistics _IBM_DS;
/* This hostadapters pos-registers pos2 until pos6 */
unsigned int _pos[8];
/* assign a special variable, that contains dedicated info about the
adaptertype */
int _special;
/* connector size on the MCA bus */
int _connector_size;
/* synchronous SCSI transfer rate bitpattern */
int _adapter_speed;
};
/* macros to access host data structure */
#define subsystem_pun(hi) (hosts[(hi)]->this_id)
#define subsystem_maxid(hi) (hosts[(hi)]->max_id)
#define ld(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_ld)
#define get_ldn(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_get_ldn)
#define get_scsi(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_get_scsi)
#define local_checking_phase_flag(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_local_checking_phase_flag)
#define got_interrupt(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_got_interrupt)
#define stat_result(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_stat_result)
#define reset_status(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_reset_status)
#define last_scsi_command(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_command)
#define last_scsi_type(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_type)
#define last_scsi_blockcount(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_blockcount)
#define last_scsi_logical_block(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_logical_block)
#define last_scsi_type(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_type)
#define next_ldn(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_next_ldn)
#define IBM_DS(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_IBM_DS)
#define special(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_special)
#define subsystem_connector_size(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_connector_size)
#define adapter_speed(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_adapter_speed)
#define pos2(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[2])
#define pos3(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[3])
#define pos4(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[4])
#define pos5(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[5])
#define pos6(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[6])
/* Define a arbitrary number as subsystem-marker-type. This number is, as
described in the ANSI-SCSI-standard, not occupied by other device-types. */
#define TYPE_IBM_SCSI_ADAPTER 0x2F
/* Define 0xFF for no device type, because this type is not defined within
the ANSI-SCSI-standard, therefore, it can be used and should not cause any
harm. */
#define TYPE_NO_DEVICE 0xFF
/* define medium-changer. If this is not defined previously, e.g. Linux
2.0.x, define this type here. */
#ifndef TYPE_MEDIUM_CHANGER
#define TYPE_MEDIUM_CHANGER 0x08
#endif
/* define possible operations for the immediate_assign command */
#define SET_LDN 0
#define REMOVE_LDN 1
/* ldn which is used to probe the SCSI devices */
#define PROBE_LDN 0
/* reset status flag contents */
#define IM_RESET_NOT_IN_PROGRESS 0
#define IM_RESET_IN_PROGRESS 1
#define IM_RESET_FINISHED_OK 2
#define IM_RESET_FINISHED_FAIL 3
#define IM_RESET_NOT_IN_PROGRESS_NO_INT 4
#define IM_RESET_FINISHED_OK_NO_INT 5
/* define undefined SCSI-command */
#define NO_SCSI 0xffff
/*-----------------------------------------------------------------------*/
/* if this is nonzero, ibmmcascsi option has been passed to the kernel */
static int io_port[IM_MAX_HOSTS] = { 0, 0, 0, 0, 0, 0, 0, 0 };
static int scsi_id[IM_MAX_HOSTS] = { 7, 7, 7, 7, 7, 7, 7, 7 };
/* fill module-parameters only, when this define is present.
(that is kernel version 2.1.x) */
#if defined(MODULE)
static char *boot_options = NULL;
module_param(boot_options, charp, 0);
module_param_array(io_port, int, NULL, 0);
module_param_array(scsi_id, int, NULL, 0);
#if 0 /* FIXME: No longer exist? --RR */
MODULE_PARM(display, "1i");
MODULE_PARM(adisplay, "1i");
MODULE_PARM(normal, "1i");
MODULE_PARM(ansi, "1i");
#endif
MODULE_LICENSE("GPL");
#endif
/*counter of concurrent disk read/writes, to turn on/off disk led */
static int disk_rw_in_progress = 0;
/* host information */
static int found = 0;
static struct Scsi_Host *hosts[IM_MAX_HOSTS + 1] = {
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
static unsigned int pos[8]; /* whole pos register-line for diagnosis */
/* Taking into account the additions, made by ZP Gu.
* This selects now the preset value from the configfile and
* offers the 'normal' commandline option to be accepted */
#ifdef CONFIG_IBMMCA_SCSI_ORDER_STANDARD
static char ibm_ansi_order = 1;
#else
static char ibm_ansi_order = 0;
#endif
static void issue_cmd(int, unsigned long, unsigned char);
static void internal_done(Scsi_Cmnd * cmd);
static void check_devices(int, int);
static int immediate_assign(int, unsigned int, unsigned int, unsigned int, unsigned int);
static int immediate_feature(int, unsigned int, unsigned int);
#ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
static int immediate_reset(int, unsigned int);
#endif
static int device_inquiry(int, int);
static int read_capacity(int, int);
static int get_pos_info(int);
static char *ti_p(int);
static char *ti_l(int);
static char *ibmrate(unsigned int, int);
static int probe_display(int);
static int probe_bus_mode(int);
static int device_exists(int, int, int *, int *);
static struct Scsi_Host *ibmmca_register(struct scsi_host_template *, int, int, int, char *);
static int option_setup(char *);
/* local functions needed for proc_info */
static int ldn_access_load(int, int);
static int ldn_access_total_read_write(int);
static irqreturn_t interrupt_handler(int irq, void *dev_id)
{
int host_index, ihost_index;
unsigned int intr_reg;
unsigned int cmd_result;
unsigned int ldn;
Scsi_Cmnd *cmd;
int lastSCSI;
struct Scsi_Host *dev = dev_id;
spin_lock(dev->host_lock);
/* search for one adapter-response on shared interrupt */
for (host_index = 0; hosts[host_index] && !(inb(IM_STAT_REG(host_index)) & IM_INTR_REQUEST); host_index++);
/* return if some other device on this IRQ caused the interrupt */
if (!hosts[host_index]) {
spin_unlock(dev->host_lock);
return IRQ_NONE;
}
/* the reset-function already did all the job, even ints got
renabled on the subsystem, so just return */
if ((reset_status(host_index) == IM_RESET_NOT_IN_PROGRESS_NO_INT) || (reset_status(host_index) == IM_RESET_FINISHED_OK_NO_INT)) {
reset_status(host_index) = IM_RESET_NOT_IN_PROGRESS;
spin_unlock(dev->host_lock);
return IRQ_HANDLED;
}
/*must wait for attention reg not busy, then send EOI to subsystem */
while (1) {
if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
break;
cpu_relax();
}
ihost_index = host_index;
/*get command result and logical device */
intr_reg = (unsigned char) (inb(IM_INTR_REG(ihost_index)));
cmd_result = intr_reg & 0xf0;
ldn = intr_reg & 0x0f;
/* get the last_scsi_command here */
lastSCSI = last_scsi_command(ihost_index)[ldn];
outb(IM_EOI | ldn, IM_ATTN_REG(ihost_index));
/*these should never happen (hw fails, or a local programming bug) */
if (!global_command_error_excuse) {
switch (cmd_result) {
/* Prevent from Ooopsing on error to show the real reason */
case IM_ADAPTER_HW_FAILURE:
case IM_SOFTWARE_SEQUENCING_ERROR:
case IM_CMD_ERROR:
printk(KERN_ERR "IBM MCA SCSI: Fatal Subsystem ERROR!\n");
printk(KERN_ERR " Last cmd=0x%x, ena=%x, len=", lastSCSI, ld(ihost_index)[ldn].scb.enable);
if (ld(ihost_index)[ldn].cmd)
printk("%ld/%ld,", (long) (ld(ihost_index)[ldn].cmd->request_bufflen), (long) (ld(ihost_index)[ldn].scb.sys_buf_length));
else
printk("none,");
if (ld(ihost_index)[ldn].cmd)
printk("Blocksize=%d", ld(ihost_index)[ldn].scb.u2.blk.length);
else
printk("Blocksize=none");
printk(", host=0x%x, ldn=0x%x\n", ihost_index, ldn);
if (ld(ihost_index)[ldn].cmd) {
printk(KERN_ERR "Blockcount=%d/%d\n", last_scsi_blockcount(ihost_index)[ldn], ld(ihost_index)[ldn].scb.u2.blk.count);
printk(KERN_ERR "Logical block=%lx/%lx\n", last_scsi_logical_block(ihost_index)[ldn], ld(ihost_index)[ldn].scb.u1.log_blk_adr);
}
printk(KERN_ERR "Reason given: %s\n", (cmd_result == IM_ADAPTER_HW_FAILURE) ? "HARDWARE FAILURE" : (cmd_result == IM_SOFTWARE_SEQUENCING_ERROR) ? "SOFTWARE SEQUENCING ERROR" : (cmd_result == IM_CMD_ERROR) ? "COMMAND ERROR" : "UNKNOWN");
/* if errors appear, enter this section to give detailed info */
printk(KERN_ERR "IBM MCA SCSI: Subsystem Error-Status follows:\n");
printk(KERN_ERR " Command Type................: %x\n", last_scsi_type(ihost_index)[ldn]);
printk(KERN_ERR " Attention Register..........: %x\n", inb(IM_ATTN_REG(ihost_index)));
printk(KERN_ERR " Basic Control Register......: %x\n", inb(IM_CTR_REG(ihost_index)));
printk(KERN_ERR " Interrupt Status Register...: %x\n", intr_reg);
printk(KERN_ERR " Basic Status Register.......: %x\n", inb(IM_STAT_REG(ihost_index)));
if ((last_scsi_type(ihost_index)[ldn] == IM_SCB) || (last_scsi_type(ihost_index)[ldn] == IM_LONG_SCB)) {
printk(KERN_ERR " SCB-Command.................: %x\n", ld(ihost_index)[ldn].scb.command);
printk(KERN_ERR " SCB-Enable..................: %x\n", ld(ihost_index)[ldn].scb.enable);
printk(KERN_ERR " SCB-logical block address...: %lx\n", ld(ihost_index)[ldn].scb.u1.log_blk_adr);
printk(KERN_ERR " SCB-system buffer address...: %lx\n", ld(ihost_index)[ldn].scb.sys_buf_adr);
printk(KERN_ERR " SCB-system buffer length....: %lx\n", ld(ihost_index)[ldn].scb.sys_buf_length);
printk(KERN_ERR " SCB-tsb address.............: %lx\n", ld(ihost_index)[ldn].scb.tsb_adr);
printk(KERN_ERR " SCB-Chain address...........: %lx\n", ld(ihost_index)[ldn].scb.scb_chain_adr);
printk(KERN_ERR " SCB-block count.............: %x\n", ld(ihost_index)[ldn].scb.u2.blk.count);
printk(KERN_ERR " SCB-block length............: %x\n", ld(ihost_index)[ldn].scb.u2.blk.length);
}
printk(KERN_ERR " Send this report to the maintainer.\n");
panic("IBM MCA SCSI: Fatal error message from the subsystem (0x%X,0x%X)!\n", lastSCSI, cmd_result);
break;
}
} else {
/* The command error handling is made silent, but we tell the
* calling function, that there is a reported error from the
* adapter. */
switch (cmd_result) {
case IM_ADAPTER_HW_FAILURE:
case IM_SOFTWARE_SEQUENCING_ERROR:
case IM_CMD_ERROR:
global_command_error_excuse = CMD_FAIL;
break;
default:
global_command_error_excuse = 0;
break;
}
}
/* if no panic appeared, increase the interrupt-counter */
IBM_DS(ihost_index).total_interrupts++;
/*only for local checking phase */
if (local_checking_phase_flag(ihost_index)) {
stat_result(ihost_index) = cmd_result;
got_interrupt(ihost_index) = 1;
reset_status(ihost_index) = IM_RESET_FINISHED_OK;
last_scsi_command(ihost_index)[ldn] = NO_SCSI;
spin_unlock(dev->host_lock);
return IRQ_HANDLED;
}
/* handling of commands coming from upper level of scsi driver */
if (last_scsi_type(ihost_index)[ldn] == IM_IMM_CMD) {
/* verify ldn, and may handle rare reset immediate command */
if ((reset_status(ihost_index) == IM_RESET_IN_PROGRESS) && (last_scsi_command(ihost_index)[ldn] == IM_RESET_IMM_CMD)) {
if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE) {
disk_rw_in_progress = 0;
PS2_DISK_LED_OFF();
reset_status(ihost_index) = IM_RESET_FINISHED_FAIL;
} else {
/*reset disk led counter, turn off disk led */
disk_rw_in_progress = 0;
PS2_DISK_LED_OFF();
reset_status(ihost_index) = IM_RESET_FINISHED_OK;
}
stat_result(ihost_index) = cmd_result;
last_scsi_command(ihost_index)[ldn] = NO_SCSI;
last_scsi_type(ihost_index)[ldn] = 0;
spin_unlock(dev->host_lock);
return IRQ_HANDLED;
} else if (last_scsi_command(ihost_index)[ldn] == IM_ABORT_IMM_CMD) {
/* react on SCSI abort command */
#ifdef IM_DEBUG_PROBE
printk("IBM MCA SCSI: Interrupt from SCSI-abort.\n");
#endif
disk_rw_in_progress = 0;
PS2_DISK_LED_OFF();
cmd = ld(ihost_index)[ldn].cmd;
ld(ihost_index)[ldn].cmd = NULL;
if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE)
cmd->result = DID_NO_CONNECT << 16;
else
cmd->result = DID_ABORT << 16;
stat_result(ihost_index) = cmd_result;
last_scsi_command(ihost_index)[ldn] = NO_SCSI;
last_scsi_type(ihost_index)[ldn] = 0;
if (cmd->scsi_done)
(cmd->scsi_done) (cmd); /* should be the internal_done */
spin_unlock(dev->host_lock);
return IRQ_HANDLED;
} else {
disk_rw_in_progress = 0;
PS2_DISK_LED_OFF();
reset_status(ihost_index) = IM_RESET_FINISHED_OK;
stat_result(ihost_index) = cmd_result;
last_scsi_command(ihost_index)[ldn] = NO_SCSI;
spin_unlock(dev->host_lock);
return IRQ_HANDLED;
}
}
last_scsi_command(ihost_index)[ldn] = NO_SCSI;
last_scsi_type(ihost_index)[ldn] = 0;
cmd = ld(ihost_index)[ldn].cmd;
ld(ihost_index)[ldn].cmd = NULL;
#ifdef IM_DEBUG_TIMEOUT
if (cmd) {
if ((cmd->target == TIMEOUT_PUN) && (cmd->device->lun == TIMEOUT_LUN)) {
printk("IBM MCA SCSI: Ignoring interrupt from pun=%x, lun=%x.\n", cmd->target, cmd->device->lun);
return IRQ_HANDLED;
}
}
#endif
/*if no command structure, just return, else clear cmd */
if (!cmd)
{
spin_unlock(dev->host_lock);
return IRQ_HANDLED;
}
#ifdef IM_DEBUG_INT
printk("cmd=%02x ireg=%02x ds=%02x cs=%02x de=%02x ce=%02x\n", cmd->cmnd[0], intr_reg, ld(ihost_index)[ldn].tsb.dev_status, ld(ihost_index)[ldn].tsb.cmd_status, ld(ihost_index)[ldn].tsb.dev_error, ld(ihost_index)[ldn].tsb.cmd_error);
#endif
/*if this is end of media read/write, may turn off PS/2 disk led */
if ((ld(ihost_index)[ldn].device_type != TYPE_NO_LUN) && (ld(ihost_index)[ldn].device_type != TYPE_NO_DEVICE)) {
/* only access this, if there was a valid device addressed */
if (--disk_rw_in_progress == 0)
PS2_DISK_LED_OFF();
}
/* IBM describes the status-mask to be 0x1e, but this is not conform
* with SCSI-definition, I suppose, the reason for it is that IBM
* adapters do not support CMD_TERMINATED, TASK_SET_FULL and
* ACA_ACTIVE as returning statusbyte information. (ML) */
if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE) {
cmd->result = (unsigned char) (ld(ihost_index)[ldn].tsb.dev_status & 0x1e);
IBM_DS(ihost_index).total_errors++;
} else
cmd->result = 0;
/* write device status into cmd->result, and call done function */
if (lastSCSI == NO_SCSI) { /* unexpected interrupt :-( */
cmd->result |= DID_BAD_INTR << 16;
printk("IBM MCA SCSI: WARNING - Interrupt from non-pending SCSI-command!\n");
} else /* things went right :-) */
cmd->result |= DID_OK << 16;
if (cmd->scsi_done)
(cmd->scsi_done) (cmd);
spin_unlock(dev->host_lock);
return IRQ_HANDLED;
}
static void issue_cmd(int host_index, unsigned long cmd_reg, unsigned char attn_reg)
{
unsigned long flags;
/* must wait for attention reg not busy */
while (1) {
spin_lock_irqsave(hosts[host_index]->host_lock, flags);
if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
break;
spin_unlock_irqrestore(hosts[host_index]->host_lock, flags);
}
/* write registers and enable system interrupts */
outl(cmd_reg, IM_CMD_REG(host_index));
outb(attn_reg, IM_ATTN_REG(host_index));
spin_unlock_irqrestore(hosts[host_index]->host_lock, flags);
}
static void internal_done(Scsi_Cmnd * cmd)
{
cmd->SCp.Status++;
return;
}
/* SCSI-SCB-command for device_inquiry */
static int device_inquiry(int host_index, int ldn)
{
int retr;
struct im_scb *scb;
struct im_tsb *tsb;
unsigned char *buf;
scb = &(ld(host_index)[ldn].scb);
tsb = &(ld(host_index)[ldn].tsb);
buf = (unsigned char *) (&(ld(host_index)[ldn].buf));
ld(host_index)[ldn].tsb.dev_status = 0; /* prepare statusblock */
for (retr = 0; retr < 3; retr++) {
/* fill scb with inquiry command */
scb->command = IM_DEVICE_INQUIRY_CMD | IM_NO_DISCONNECT;
scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
last_scsi_command(host_index)[ldn] = IM_DEVICE_INQUIRY_CMD;
last_scsi_type(host_index)[ldn] = IM_SCB;
scb->sys_buf_adr = isa_virt_to_bus(buf);
scb->sys_buf_length = 255; /* maximum bufferlength gives max info */
scb->tsb_adr = isa_virt_to_bus(tsb);
/* issue scb to passed ldn, and busy wait for interrupt */
got_interrupt(host_index) = 0;
issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | ldn);
while (!got_interrupt(host_index))
barrier();
/*if command successful, break */
if ((stat_result(host_index) == IM_SCB_CMD_COMPLETED) || (stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
return 1;
}
/*if all three retries failed, return "no device at this ldn" */
if (retr >= 3)
return 0;
else
return 1;
}
static int read_capacity(int host_index, int ldn)
{
int retr;
struct im_scb *scb;
struct im_tsb *tsb;
unsigned char *buf;
scb = &(ld(host_index)[ldn].scb);
tsb = &(ld(host_index)[ldn].tsb);
buf = (unsigned char *) (&(ld(host_index)[ldn].buf));
ld(host_index)[ldn].tsb.dev_status = 0;
for (retr = 0; retr < 3; retr++) {
/*fill scb with read capacity command */
scb->command = IM_READ_CAPACITY_CMD;
scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_READ_CONTROL | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
last_scsi_command(host_index)[ldn] = IM_READ_CAPACITY_CMD;
last_scsi_type(host_index)[ldn] = IM_SCB;
scb->sys_buf_adr = isa_virt_to_bus(buf);
scb->sys_buf_length = 8;
scb->tsb_adr = isa_virt_to_bus(tsb);
/*issue scb to passed ldn, and busy wait for interrupt */
got_interrupt(host_index) = 0;
issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | ldn);
while (!got_interrupt(host_index))
barrier();
/*if got capacity, get block length and return one device found */
if ((stat_result(host_index) == IM_SCB_CMD_COMPLETED) || (stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
return 1;
}
/*if all three retries failed, return "no device at this ldn" */
if (retr >= 3)
return 0;
else
return 1;
}
static int get_pos_info(int host_index)
{
int retr;
struct im_scb *scb;
struct im_tsb *tsb;
unsigned char *buf;
scb = &(ld(host_index)[MAX_LOG_DEV].scb);
tsb = &(ld(host_index)[MAX_LOG_DEV].tsb);
buf = (unsigned char *) (&(ld(host_index)[MAX_LOG_DEV].buf));
ld(host_index)[MAX_LOG_DEV].tsb.dev_status = 0;
for (retr = 0; retr < 3; retr++) {
/*fill scb with get_pos_info command */
scb->command = IM_GET_POS_INFO_CMD;
scb->enable = IM_READ_CONTROL | IM_REPORT_TSB_ONLY_ON_ERROR | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
last_scsi_command(host_index)[MAX_LOG_DEV] = IM_GET_POS_INFO_CMD;
last_scsi_type(host_index)[MAX_LOG_DEV] = IM_SCB;
scb->sys_buf_adr = isa_virt_to_bus(buf);
if (special(host_index) == IBM_SCSI2_FW)
scb->sys_buf_length = 256; /* get all info from F/W adapter */
else
scb->sys_buf_length = 18; /* get exactly 18 bytes for other SCSI */
scb->tsb_adr = isa_virt_to_bus(tsb);
/*issue scb to ldn=15, and busy wait for interrupt */
got_interrupt(host_index) = 0;
issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | MAX_LOG_DEV);
/* FIXME: timeout */
while (!got_interrupt(host_index))
barrier();
/*if got POS-stuff, get block length and return one device found */
if ((stat_result(host_index) == IM_SCB_CMD_COMPLETED) || (stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
return 1;
}
/* if all three retries failed, return "no device at this ldn" */
if (retr >= 3)
return 0;
else
return 1;
}
/* SCSI-immediate-command for assign. This functions maps/unmaps specific
ldn-numbers on SCSI (PUN,LUN). It is needed for presetting of the
subsystem and for dynamical remapping od ldns. */
static int immediate_assign(int host_index, unsigned int pun, unsigned int lun, unsigned int ldn, unsigned int operation)
{
int retr;
unsigned long imm_cmd;
for (retr = 0; retr < 3; retr++) {
/* select mutation level of the SCSI-adapter */
switch (special(host_index)) {
case IBM_SCSI2_FW:
imm_cmd = (unsigned long) (IM_ASSIGN_IMM_CMD);
imm_cmd |= (unsigned long) ((lun & 7) << 24);
imm_cmd |= (unsigned long) ((operation & 1) << 23);
imm_cmd |= (unsigned long) ((pun & 7) << 20) | ((pun & 8) << 24);
imm_cmd |= (unsigned long) ((ldn & 15) << 16);
break;
default:
imm_cmd = inl(IM_CMD_REG(host_index));
imm_cmd &= (unsigned long) (0xF8000000); /* keep reserved bits */
imm_cmd |= (unsigned long) (IM_ASSIGN_IMM_CMD);
imm_cmd |= (unsigned long) ((lun & 7) << 24);
imm_cmd |= (unsigned long) ((operation & 1) << 23);
imm_cmd |= (unsigned long) ((pun & 7) << 20);
imm_cmd |= (unsigned long) ((ldn & 15) << 16);
break;
}
last_scsi_command(host_index)[MAX_LOG_DEV] = IM_ASSIGN_IMM_CMD;
last_scsi_type(host_index)[MAX_LOG_DEV] = IM_IMM_CMD;
got_interrupt(host_index) = 0;
issue_cmd(host_index, (unsigned long) (imm_cmd), IM_IMM_CMD | MAX_LOG_DEV);
while (!got_interrupt(host_index))
barrier();
/*if command successful, break */
if (stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
return 1;
}
if (retr >= 3)
return 0;
else
return 1;
}
static int immediate_feature(int host_index, unsigned int speed, unsigned int timeout)
{
int retr;
unsigned long imm_cmd;
for (retr = 0; retr < 3; retr++) {
/* select mutation level of the SCSI-adapter */
imm_cmd = IM_FEATURE_CTR_IMM_CMD;
imm_cmd |= (unsigned long) ((speed & 0x7) << 29);
imm_cmd |= (unsigned long) ((timeout & 0x1fff) << 16);
last_scsi_command(host_index)[MAX_LOG_DEV] = IM_FEATURE_CTR_IMM_CMD;
last_scsi_type(host_index)[MAX_LOG_DEV] = IM_IMM_CMD;
got_interrupt(host_index) = 0;
/* we need to run into command errors in order to probe for the
* right speed! */
global_command_error_excuse = 1;
issue_cmd(host_index, (unsigned long) (imm_cmd), IM_IMM_CMD | MAX_LOG_DEV);
/* FIXME: timeout */
while (!got_interrupt(host_index))
barrier();
if (global_command_error_excuse == CMD_FAIL) {
global_command_error_excuse = 0;
return 2;
} else
global_command_error_excuse = 0;
/*if command successful, break */
if (stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
return 1;
}
if (retr >= 3)
return 0;
else
return 1;
}
#ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
static int immediate_reset(int host_index, unsigned int ldn)
{
int retries;
int ticks;
unsigned long imm_command;
for (retries = 0; retries < 3; retries++) {
imm_command = inl(IM_CMD_REG(host_index));
imm_command &= (unsigned long) (0xFFFF0000); /* keep reserved bits */
imm_command |= (unsigned long) (IM_RESET_IMM_CMD);
last_scsi_command(host_index)[ldn] = IM_RESET_IMM_CMD;
last_scsi_type(host_index)[ldn] = IM_IMM_CMD;
got_interrupt(host_index) = 0;
reset_status(host_index) = IM_RESET_IN_PROGRESS;
issue_cmd(host_index, (unsigned long) (imm_command), IM_IMM_CMD | ldn);
ticks = IM_RESET_DELAY * HZ;
while (reset_status(host_index) == IM_RESET_IN_PROGRESS && --ticks) {
udelay((1 + 999 / HZ) * 1000);
barrier();
}
/* if reset did not complete, just complain */
if (!ticks) {
printk(KERN_ERR "IBM MCA SCSI: reset did not complete within %d seconds.\n", IM_RESET_DELAY);
reset_status(host_index) = IM_RESET_FINISHED_OK;
/* did not work, finish */
return 1;
}
/*if command successful, break */
if (stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
return 1;
}
if (retries >= 3)
return 0;
else
return 1;
}
#endif
/* type-interpreter for physical device numbers */
static char *ti_p(int dev)
{
switch (dev) {
case TYPE_IBM_SCSI_ADAPTER:
return ("A");
case TYPE_DISK:
return ("D");
case TYPE_TAPE:
return ("T");
case TYPE_PROCESSOR:
return ("P");
case TYPE_WORM:
return ("W");
case TYPE_ROM:
return ("R");
case TYPE_SCANNER:
return ("S");
case TYPE_MOD:
return ("M");
case TYPE_MEDIUM_CHANGER:
return ("C");
case TYPE_NO_LUN:
return ("+"); /* show NO_LUN */
}
return ("-"); /* TYPE_NO_DEVICE and others */
}
/* interpreter for logical device numbers (ldn) */
static char *ti_l(int val)
{
const char hex[16] = "0123456789abcdef";
static char answer[2];
answer[1] = (char) (0x0);
if (val <= MAX_LOG_DEV)
answer[0] = hex[val];
else
answer[0] = '-';
return (char *) &answer;
}
/* transfers bitpattern of the feature command to values in MHz */
static char *ibmrate(unsigned int speed, int i)
{
switch (speed) {
case 0:
return i ? "5.00" : "10.00";
case 1:
return i ? "4.00" : "8.00";
case 2:
return i ? "3.33" : "6.66";
case 3:
return i ? "2.86" : "5.00";
case 4:
return i ? "2.50" : "4.00";
case 5:
return i ? "2.22" : "3.10";
case 6:
return i ? "2.00" : "2.50";
case 7:
return i ? "1.82" : "2.00";
}
return "---";
}
static int probe_display(int what)
{
static int rotator = 0;
const char rotor[] = "|/-\\";
if (!(display_mode & LED_DISP))
return 0;
if (!what) {
outl(0x20202020, MOD95_LED_PORT);
outl(0x20202020, MOD95_LED_PORT + 4);
} else {
outb('S', MOD95_LED_PORT + 7);
outb('C', MOD95_LED_PORT + 6);
outb('S', MOD95_LED_PORT + 5);
outb('I', MOD95_LED_PORT + 4);
outb('i', MOD95_LED_PORT + 3);
outb('n', MOD95_LED_PORT + 2);
outb('i', MOD95_LED_PORT + 1);
outb((char) (rotor[rotator]), MOD95_LED_PORT);
rotator++;
if (rotator > 3)
rotator = 0;
}
return 0;
}
static int probe_bus_mode(int host_index)
{
struct im_pos_info *info;
int num_bus = 0;
int ldn;
info = (struct im_pos_info *) (&(ld(host_index)[MAX_LOG_DEV].buf));
if (get_pos_info(host_index)) {
if (info->connector_size & 0xf000)
subsystem_connector_size(host_index) = 16;
else
subsystem_connector_size(host_index) = 32;
num_bus |= (info->pos_4b & 8) >> 3;
for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
if ((special(host_index) == IBM_SCSI_WCACHE) || (special(host_index) == IBM_7568_WCACHE)) {
if (!((info->cache_stat >> ldn) & 1))
ld(host_index)[ldn].cache_flag = 0;
}
if (!((info->retry_stat >> ldn) & 1))
ld(host_index)[ldn].retry_flag = 0;
}
#ifdef IM_DEBUG_PROBE
printk("IBM MCA SCSI: SCSI-Cache bits: ");
for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
printk("%d", ld(host_index)[ldn].cache_flag);
}
printk("\nIBM MCA SCSI: SCSI-Retry bits: ");
for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
printk("%d", ld(host_index)[ldn].retry_flag);
}
printk("\n");
#endif
}
return num_bus;
}
/* probing scsi devices */
static void check_devices(int host_index, int adaptertype)
{
int id, lun, ldn, ticks;
int count_devices; /* local counter for connected device */
int max_pun;
int num_bus;
int speedrun; /* local adapter_speed check variable */
/* assign default values to certain variables */
ticks = 0;
count_devices = 0;
IBM_DS(host_index).dyn_flag = 0; /* normally no need for dynamical ldn management */
IBM_DS(host_index).total_errors = 0; /* set errorcounter to 0 */
next_ldn(host_index) = 7; /* next ldn to be assigned is 7, because 0-6 is 'hardwired' */
/* initialize the very important driver-informational arrays/structs */
memset(ld(host_index), 0, sizeof(ld(host_index)));
for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
last_scsi_command(host_index)[ldn] = NO_SCSI; /* emptify last SCSI-command storage */
last_scsi_type(host_index)[ldn] = 0;
ld(host_index)[ldn].cache_flag = 1;
ld(host_index)[ldn].retry_flag = 1;
}
memset(get_ldn(host_index), TYPE_NO_DEVICE, sizeof(get_ldn(host_index))); /* this is essential ! */
memset(get_scsi(host_index), TYPE_NO_DEVICE, sizeof(get_scsi(host_index))); /* this is essential ! */
for (lun = 0; lun < 8; lun++) {
/* mark the adapter at its pun on all luns */
get_scsi(host_index)[subsystem_pun(host_index)][lun] = TYPE_IBM_SCSI_ADAPTER;
get_ldn(host_index)[subsystem_pun(host_index)][lun] = MAX_LOG_DEV; /* make sure, the subsystem
ldn is active for all
luns. */
}
probe_display(0); /* Supercool display usage during SCSI-probing. */
/* This makes sense, when booting without any */
/* monitor connected on model XX95. */
/* STEP 1: */
adapter_speed(host_index) = global_adapter_speed;
speedrun = adapter_speed(host_index);
while (immediate_feature(host_index, speedrun, adapter_timeout) == 2) {
probe_display(1);
if (speedrun == 7)
panic("IBM MCA SCSI: Cannot set Synchronous-Transfer-Rate!\n");
speedrun++;
if (speedrun > 7)
speedrun = 7;
}
adapter_speed(host_index) = speedrun;
/* Get detailed information about the current adapter, necessary for
* device operations: */
num_bus = probe_bus_mode(host_index);
/* num_bus contains only valid data for the F/W adapter! */
if (adaptertype == IBM_SCSI2_FW) { /* F/W SCSI adapter: */
/* F/W adapter PUN-space extension evaluation: */
if (num_bus) {
printk(KERN_INFO "IBM MCA SCSI: Separate bus mode (wide-addressing enabled)\n");
subsystem_maxid(host_index) = 16;
} else {
printk(KERN_INFO "IBM MCA SCSI: Combined bus mode (wide-addressing disabled)\n");
subsystem_maxid(host_index) = 8;
}
printk(KERN_INFO "IBM MCA SCSI: Sync.-Rate (F/W: 20, Int.: 10, Ext.: %s) MBytes/s\n", ibmrate(speedrun, adaptertype));
} else /* all other IBM SCSI adapters: */
printk(KERN_INFO "IBM MCA SCSI: Synchronous-SCSI-Transfer-Rate: %s MBytes/s\n", ibmrate(speedrun, adaptertype));
/* assign correct PUN device space */
max_pun = subsystem_maxid(host_index);
#ifdef IM_DEBUG_PROBE
printk("IBM MCA SCSI: Current SCSI-host index: %d\n", host_index);
printk("IBM MCA SCSI: Removing default logical SCSI-device mapping.");
#else
printk(KERN_INFO "IBM MCA SCSI: Dev. Order: %s, Mapping (takes <2min): ", (ibm_ansi_order) ? "ANSI" : "New");
#endif
for (ldn = 0; ldn < MAX_LOG_DEV; ldn++) {
probe_display(1);
#ifdef IM_DEBUG_PROBE
printk(".");
#endif
immediate_assign(host_index, 0, 0, ldn, REMOVE_LDN); /* remove ldn (wherever) */
}
lun = 0; /* default lun is 0 */
#ifndef IM_DEBUG_PROBE
printk("cleared,");
#endif
/* STEP 2: */
#ifdef IM_DEBUG_PROBE
printk("\nIBM MCA SCSI: Scanning SCSI-devices.");
#endif
for (id = 0; id < max_pun; id++)
#ifdef CONFIG_SCSI_MULTI_LUN
for (lun = 0; lun < 8; lun++)
#endif
{
probe_display(1);
#ifdef IM_DEBUG_PROBE
printk(".");
#endif
if (id != subsystem_pun(host_index)) {
/* if pun is not the adapter: */
/* set ldn=0 to pun,lun */
immediate_assign(host_index, id, lun, PROBE_LDN, SET_LDN);
if (device_inquiry(host_index, PROBE_LDN)) { /* probe device */
get_scsi(host_index)[id][lun] = (unsigned char) (ld(host_index)[PROBE_LDN].buf[0]);
/* entry, even for NO_LUN */
if (ld(host_index)[PROBE_LDN].buf[0] != TYPE_NO_LUN)
count_devices++; /* a existing device is found */
}
/* remove ldn */
immediate_assign(host_index, id, lun, PROBE_LDN, REMOVE_LDN);
}
}
#ifndef IM_DEBUG_PROBE
printk("scanned,");
#endif
/* STEP 3: */
#ifdef IM_DEBUG_PROBE
printk("\nIBM MCA SCSI: Mapping SCSI-devices.");
#endif
ldn = 0;
lun = 0;
#ifdef CONFIG_SCSI_MULTI_LUN
for (lun = 0; lun < 8 && ldn < MAX_LOG_DEV; lun++)
#endif
for (id = 0; id < max_pun && ldn < MAX_LOG_DEV; id++) {
probe_display(1);
#ifdef IM_DEBUG_PROBE
printk(".");
#endif
if (id != subsystem_pun(host_index)) {
if (get_scsi(host_index)[id][lun] != TYPE_NO_LUN && get_scsi(host_index)[id][lun] != TYPE_NO_DEVICE) {
/* Only map if accepted type. Always enter for
lun == 0 to get no gaps into ldn-mapping for ldn<7. */
immediate_assign(host_index, id, lun, ldn, SET_LDN);
get_ldn(host_index)[id][lun] = ldn; /* map ldn */
if (device_exists(host_index, ldn, &ld(host_index)[ldn].block_length, &ld(host_index)[ldn].device_type)) {
#ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
printk("resetting device at ldn=%x ... ", ldn);
immediate_reset(host_index, ldn);
#endif
ldn++;
} else {
/* device vanished, probably because we don't know how to
* handle it or because it has problems */
if (lun > 0) {
/* remove mapping */
get_ldn(host_index)[id][lun] = TYPE_NO_DEVICE;
immediate_assign(host_index, 0, 0, ldn, REMOVE_LDN);
} else
ldn++;
}
} else if (lun == 0) {
/* map lun == 0, even if no device exists */
immediate_assign(host_index, id, lun, ldn, SET_LDN);
get_ldn(host_index)[id][lun] = ldn; /* map ldn */
ldn++;
}
}
}
/* STEP 4: */
/* map remaining ldns to non-existing devices */
for (lun = 1; lun < 8 && ldn < MAX_LOG_DEV; lun++)
for (id = 0; id < max_pun && ldn < MAX_LOG_DEV; id++) {
if (get_scsi(host_index)[id][lun] == TYPE_NO_LUN || get_scsi(host_index)[id][lun] == TYPE_NO_DEVICE) {
probe_display(1);
/* Map remaining ldns only to NON-existing pun,lun
combinations to make sure an inquiry will fail.
For MULTI_LUN, it is needed to avoid adapter autonome
SCSI-remapping. */
immediate_assign(host_index, id, lun, ldn, SET_LDN);
get_ldn(host_index)[id][lun] = ldn;
ldn++;
}
}
#ifndef IM_DEBUG_PROBE
printk("mapped.");
#endif
printk("\n");
#ifdef IM_DEBUG_PROBE
if (ibm_ansi_order)
printk("IBM MCA SCSI: Device order: IBM/ANSI (pun=7 is first).\n");
else
printk("IBM MCA SCSI: Device order: New Industry Standard (pun=0 is first).\n");
#endif
#ifdef IM_DEBUG_PROBE
/* Show the physical and logical mapping during boot. */
printk("IBM MCA SCSI: Determined SCSI-device-mapping:\n");
printk(" Physical SCSI-Device Map Logical SCSI-Device Map\n");
printk("ID\\LUN 0 1 2 3 4 5 6 7 ID\\LUN 0 1 2 3 4 5 6 7\n");
for (id = 0; id < max_pun; id++) {
printk("%2d ", id);
for (lun = 0; lun < 8; lun++)
printk("%2s ", ti_p(get_scsi(host_index)[id][lun]));
printk(" %2d ", id);
for (lun = 0; lun < 8; lun++)
printk("%2s ", ti_l(get_ldn(host_index)[id][lun]));
printk("\n");
}
#endif
/* assign total number of found SCSI-devices to the statistics struct */
IBM_DS(host_index).total_scsi_devices = count_devices;
/* decide for output in /proc-filesystem, if the configuration of
SCSI-devices makes dynamical reassignment of devices necessary */
if (count_devices >= MAX_LOG_DEV)
IBM_DS(host_index).dyn_flag = 1; /* dynamical assignment is necessary */
else
IBM_DS(host_index).dyn_flag = 0; /* dynamical assignment is not necessary */
/* If no SCSI-devices are assigned, return 1 in order to cause message. */
if (ldn == 0)
printk("IBM MCA SCSI: Warning: No SCSI-devices found/assigned!\n");
/* reset the counters for statistics on the current adapter */
IBM_DS(host_index).scbs = 0;
IBM_DS(host_index).long_scbs = 0;
IBM_DS(host_index).total_accesses = 0;
IBM_DS(host_index).total_interrupts = 0;
IBM_DS(host_index).dynamical_assignments = 0;
memset(IBM_DS(host_index).ldn_access, 0x0, sizeof(IBM_DS(host_index).ldn_access));
memset(IBM_DS(host_index).ldn_read_access, 0x0, sizeof(IBM_DS(host_index).ldn_read_access));
memset(IBM_DS(host_index).ldn_write_access, 0x0, sizeof(IBM_DS(host_index).ldn_write_access));
memset(IBM_DS(host_index).ldn_inquiry_access, 0x0, sizeof(IBM_DS(host_index).ldn_inquiry_access));
memset(IBM_DS(host_index).ldn_modeselect_access, 0x0, sizeof(IBM_DS(host_index).ldn_modeselect_access));
memset(IBM_DS(host_index).ldn_assignments, 0x0, sizeof(IBM_DS(host_index).ldn_assignments));
probe_display(0);
return;
}
static int device_exists(int host_index, int ldn, int *block_length, int *device_type)
{
unsigned char *buf;
/* if no valid device found, return immediately with 0 */
if (!(device_inquiry(host_index, ldn)))
return 0;
buf = (unsigned char *) (&(ld(host_index)[ldn].buf));
if (*buf == TYPE_ROM) {
*device_type = TYPE_ROM;
*block_length = 2048; /* (standard blocksize for yellow-/red-book) */
return 1;
}
if (*buf == TYPE_WORM) {
*device_type = TYPE_WORM;
*block_length = 2048;
return 1;
}
if (*buf == TYPE_DISK) {
*device_type = TYPE_DISK;
if (read_capacity(host_index, ldn)) {
*block_length = *(buf + 7) + (*(buf + 6) << 8) + (*(buf + 5) << 16) + (*(buf + 4) << 24);
return 1;
} else
return 0;
}
if (*buf == TYPE_MOD) {
*device_type = TYPE_MOD;
if (read_capacity(host_index, ldn)) {
*block_length = *(buf + 7) + (*(buf + 6) << 8) + (*(buf + 5) << 16) + (*(buf + 4) << 24);
return 1;
} else
return 0;
}
if (*buf == TYPE_TAPE) {
*device_type = TYPE_TAPE;
*block_length = 0; /* not in use (setting by mt and mtst in op.) */
return 1;
}
if (*buf == TYPE_PROCESSOR) {
*device_type = TYPE_PROCESSOR;
*block_length = 0; /* they set their stuff on drivers */
return 1;
}
if (*buf == TYPE_SCANNER) {
*device_type = TYPE_SCANNER;
*block_length = 0; /* they set their stuff on drivers */
return 1;
}
if (*buf == TYPE_MEDIUM_CHANGER) {
*device_type = TYPE_MEDIUM_CHANGER;
*block_length = 0; /* One never knows, what to expect on a medium
changer device. */
return 1;
}
return 0;
}
static void internal_ibmmca_scsi_setup(char *str, int *ints)
{
int i, j, io_base, id_base;
char *token;
io_base = 0;
id_base = 0;
if (str) {
j = 0;
while ((token = strsep(&str, ",")) != NULL) {
if (!strcmp(token, "activity"))
display_mode |= LED_ACTIVITY;
if (!strcmp(token, "display"))
display_mode |= LED_DISP;
if (!strcmp(token, "adisplay"))
display_mode |= LED_ADISP;
if (!strcmp(token, "normal"))
ibm_ansi_order = 0;
if (!strcmp(token, "ansi"))
ibm_ansi_order = 1;
if (!strcmp(token, "fast"))
global_adapter_speed = 0;
if (!strcmp(token, "medium"))
global_adapter_speed = 4;
if (!strcmp(token, "slow"))
global_adapter_speed = 7;
if ((*token == '-') || (isdigit(*token))) {
if (!(j % 2) && (io_base < IM_MAX_HOSTS))
io_port[io_base++] = simple_strtoul(token, NULL, 0);
if ((j % 2) && (id_base < IM_MAX_HOSTS))
scsi_id[id_base++] = simple_strtoul(token, NULL, 0);
j++;
}
}
} else if (ints) {
for (i = 0; i < IM_MAX_HOSTS && 2 * i + 2 < ints[0]; i++) {
io_port[i] = ints[2 * i + 2];
scsi_id[i] = ints[2 * i + 2];
}
}
return;
}
static int ibmmca_getinfo(char *buf, int slot, void *dev_id)
{
struct Scsi_Host *shpnt;
int len, speciale, connectore, k;
unsigned int pos[8];
unsigned long flags;
struct Scsi_Host *dev = dev_id;
spin_lock_irqsave(dev->host_lock, flags);
shpnt = dev; /* assign host-structure to local pointer */
len = 0; /* set filled text-buffer index to 0 */
/* get the _special contents of the hostdata structure */
speciale = ((struct ibmmca_hostdata *) shpnt->hostdata)->_special;
connectore = ((struct ibmmca_hostdata *) shpnt->hostdata)->_connector_size;
for (k = 2; k < 4; k++)
pos[k] = ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k];
if (speciale == FORCED_DETECTION) { /* forced detection */
len += sprintf(buf + len,
"Adapter category: forced detected\n" "***************************************\n" "*** Forced detected SCSI Adapter ***\n" "*** No chip-information available ***\n" "***************************************\n");
} else if (speciale == INTEGRATED_SCSI) {
/* if the integrated subsystem has been found automatically: */
len += sprintf(buf + len,
"Adapter category: integrated\n" "Chip revision level: %d\n" "Chip status: %s\n" "8 kByte NVRAM status: %s\n", ((pos[2] & 0xf0) >> 4), (pos[2] & 1) ? "enabled" : "disabled", (pos[2] & 2) ? "locked" : "accessible");
} else if ((speciale >= 0) && (speciale < ARRAY_SIZE(subsys_list))) {
/* if the subsystem is a slot adapter */
len += sprintf(buf + len, "Adapter category: slot-card\n" "ROM Segment Address: ");
if ((pos[2] & 0xf0) == 0xf0)
len += sprintf(buf + len, "off\n");
else
len += sprintf(buf + len, "0x%x\n", ((pos[2] & 0xf0) << 13) + 0xc0000);
len += sprintf(buf + len, "Chip status: %s\n", (pos[2] & 1) ? "enabled" : "disabled");
len += sprintf(buf + len, "Adapter I/O Offset: 0x%x\n", ((pos[2] & 0x0e) << 2));
} else {
len += sprintf(buf + len, "Adapter category: unknown\n");
}
/* common subsystem information to write to the slotn file */
len += sprintf(buf + len, "Subsystem PUN: %d\n", shpnt->this_id);
len += sprintf(buf + len, "I/O base address range: 0x%x-0x%x\n", (unsigned int) (shpnt->io_port), (unsigned int) (shpnt->io_port + 7));
len += sprintf(buf + len, "MCA-slot size: %d bits", connectore);
/* Now make sure, the bufferlength is devidable by 4 to avoid
* paging problems of the buffer. */
while (len % sizeof(int) != (sizeof(int) - 1))
len += sprintf(buf + len, " ");
len += sprintf(buf + len, "\n");
spin_unlock_irqrestore(shpnt->host_lock, flags);
return len;
}
int ibmmca_detect(struct scsi_host_template * scsi_template)
{
struct Scsi_Host *shpnt;
int port, id, i, j, k, slot;
int devices_on_irq_11 = 0;
int devices_on_irq_14 = 0;
int IRQ14_registered = 0;
int IRQ11_registered = 0;
found = 0; /* make absolutely sure, that found is set to 0 */
/* First of all, print the version number of the driver. This is
* important to allow better user bugreports in case of already
* having problems with the MCA_bus probing. */
printk(KERN_INFO "IBM MCA SCSI: Version %s\n", IBMMCA_SCSI_DRIVER_VERSION);
/* if this is not MCA machine, return "nothing found" */
if (!MCA_bus) {
printk(KERN_INFO "IBM MCA SCSI: No Microchannel-bus present --> Aborting.\n" " This machine does not have any IBM MCA-bus\n" " or the MCA-Kernel-support is not enabled!\n");
return 0;
}
#ifdef MODULE
/* If the driver is run as module, read from conf.modules or cmd-line */
if (boot_options)
option_setup(boot_options);
#endif
/* get interrupt request level */
if (request_irq(IM_IRQ, interrupt_handler, IRQF_SHARED, "ibmmcascsi", hosts)) {
printk(KERN_ERR "IBM MCA SCSI: Unable to get shared IRQ %d.\n", IM_IRQ);
return 0;
} else
IRQ14_registered++;
/* if ibmmcascsi setup option was passed to kernel, return "found" */
for (i = 0; i < IM_MAX_HOSTS; i++)
if (io_port[i] > 0 && scsi_id[i] >= 0 && scsi_id[i] < 8) {
printk("IBM MCA SCSI: forced detected SCSI Adapter, io=0x%x, scsi id=%d.\n", io_port[i], scsi_id[i]);
if ((shpnt = ibmmca_register(scsi_template, io_port[i], scsi_id[i], FORCED_DETECTION, "forced detected SCSI Adapter"))) {
for (k = 2; k < 7; k++)
((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = 0;
((struct ibmmca_hostdata *) shpnt->hostdata)->_special = FORCED_DETECTION;
mca_set_adapter_name(MCA_INTEGSCSI, "forced detected SCSI Adapter");
mca_set_adapter_procfn(MCA_INTEGSCSI, (MCA_ProcFn) ibmmca_getinfo, shpnt);
mca_mark_as_used(MCA_INTEGSCSI);
devices_on_irq_14++;
}
}
if (found)
return found;
/* The POS2-register of all PS/2 model SCSI-subsystems has the following
* interpretation of bits:
* Bit 7 - 4 : Chip Revision ID (Release)
* Bit 3 - 2 : Reserved
* Bit 1 : 8k NVRAM Disabled
* Bit 0 : Chip Enable (EN-Signal)
* The POS3-register is interpreted as follows:
* Bit 7 - 5 : SCSI ID
* Bit 4 : Reserved = 0
* Bit 3 - 0 : Reserved = 0
* (taken from "IBM, PS/2 Hardware Interface Technical Reference, Common
* Interfaces (1991)").
* In short words, this means, that IBM PS/2 machines only support
* 1 single subsystem by default. The slot-adapters must have another
* configuration on pos2. Here, one has to assume the following
* things for POS2-register:
* Bit 7 - 4 : Chip Revision ID (Release)
* Bit 3 - 1 : port offset factor
* Bit 0 : Chip Enable (EN-Signal)
* As I found a patch here, setting the IO-registers to 0x3540 forced,
* as there was a 0x05 in POS2 on a model 56, I assume, that the
* port 0x3540 must be fix for integrated SCSI-controllers.
* Ok, this discovery leads to the following implementation: (M.Lang) */
/* first look for the IBM SCSI integrated subsystem on the motherboard */
for (j = 0; j < 8; j++) /* read the pos-information */
pos[j] = mca_read_stored_pos(MCA_INTEGSCSI, j);
/* pos2 = pos3 = 0xff if there is no integrated SCSI-subsystem present, but
* if we ignore the settings of all surrounding pos registers, it is not
* completely sufficient to only check pos2 and pos3. */
/* Therefore, now the following if statement is used to
* make sure, we see a real integrated onboard SCSI-interface and no
* internal system information, which gets mapped to some pos registers
* on models 95xx. */
if ((!pos[0] && !pos[1] && pos[2] > 0 && pos[3] > 0 && !pos[4] && !pos[5] && !pos[6] && !pos[7]) || (pos[0] == 0xff && pos[1] == 0xff && pos[2] < 0xff && pos[3] < 0xff && pos[4] == 0xff && pos[5] == 0xff && pos[6] == 0xff && pos[7] == 0xff)) {
if ((pos[2] & 1) == 1) /* is the subsystem chip enabled ? */
port = IM_IO_PORT;
else { /* if disabled, no IRQs will be generated, as the chip won't
* listen to the incoming commands and will do really nothing,
* except for listening to the pos-register settings. If this
* happens, I need to hugely think about it, as one has to
* write something to the MCA-Bus pos register in order to
* enable the chip. Normally, IBM-SCSI won't pass the POST,
* when the chip is disabled (see IBM tech. ref.). */
port = IM_IO_PORT; /* anyway, set the portnumber and warn */
printk("IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n" " SCSI-operations may not work.\n");
}
id = (pos[3] & 0xe0) >> 5; /* this is correct and represents the PUN */
/* give detailed information on the subsystem. This helps me
* additionally during debugging and analyzing bug-reports. */
printk(KERN_INFO "IBM MCA SCSI: IBM Integrated SCSI Controller ffound, io=0x%x, scsi id=%d,\n", port, id);
printk(KERN_INFO " chip rev.=%d, 8K NVRAM=%s, subsystem=%s\n", ((pos[2] & 0xf0) >> 4), (pos[2] & 2) ? "locked" : "accessible", (pos[2] & 1) ? "enabled." : "disabled.");
/* register the found integrated SCSI-subsystem */
if ((shpnt = ibmmca_register(scsi_template, port, id, INTEGRATED_SCSI, "IBM Integrated SCSI Controller")))
{
for (k = 2; k < 7; k++)
((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = pos[k];
((struct ibmmca_hostdata *) shpnt->hostdata)->_special = INTEGRATED_SCSI;
mca_set_adapter_name(MCA_INTEGSCSI, "IBM Integrated SCSI Controller");
mca_set_adapter_procfn(MCA_INTEGSCSI, (MCA_ProcFn) ibmmca_getinfo, shpnt);
mca_mark_as_used(MCA_INTEGSCSI);
devices_on_irq_14++;
}
}
/* now look for other adapters in MCA slots, */
/* determine the number of known IBM-SCSI-subsystem types */
/* see the pos[2] dependence to get the adapter port-offset. */
for (i = 0; i < ARRAY_SIZE(subsys_list); i++) {
/* scan each slot for a fitting adapter id */
slot = 0; /* start at slot 0 */
while ((slot = mca_find_adapter(subsys_list[i].mca_id, slot))
!= MCA_NOTFOUND) { /* scan through all slots */
for (j = 0; j < 8; j++) /* read the pos-information */
pos[j] = mca_read_stored_pos(slot, j);
if ((pos[2] & 1) == 1)
/* is the subsystem chip enabled ? */
/* (explanations see above) */
port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
else {
/* anyway, set the portnumber and warn */
port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
printk(KERN_WARNING "IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n");
printk(KERN_WARNING " SCSI-operations may not work.\n");
}
if ((i == IBM_SCSI2_FW) && (pos[6] != 0)) {
printk(KERN_ERR "IBM MCA SCSI: ERROR - Wrong POS(6)-register setting!\n");
printk(KERN_ERR " Impossible to determine adapter PUN!\n");
printk(KERN_ERR " Guessing adapter PUN = 7.\n");
id = 7;
} else {
id = (pos[3] & 0xe0) >> 5; /* get subsystem PUN */
if (i == IBM_SCSI2_FW) {
id |= (pos[3] & 0x10) >> 1; /* get subsystem PUN high-bit
* for F/W adapters */
}
}
if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0)) {
/* IRQ11 is used by SCSI-2 F/W Adapter/A */
printk(KERN_DEBUG "IBM MCA SCSI: SCSI-2 F/W adapter needs IRQ 11.\n");
/* get interrupt request level */
if (request_irq(IM_IRQ_FW, interrupt_handler, IRQF_SHARED, "ibmmcascsi", hosts)) {
printk(KERN_ERR "IBM MCA SCSI: Unable to get shared IRQ %d.\n", IM_IRQ_FW);
} else
IRQ11_registered++;
}
printk(KERN_INFO "IBM MCA SCSI: %s found in slot %d, io=0x%x, scsi id=%d,\n", subsys_list[i].description, slot + 1, port, id);
if ((pos[2] & 0xf0) == 0xf0)
printk(KERN_DEBUG" ROM Addr.=off,");
else
printk(KERN_DEBUG " ROM Addr.=0x%x,", ((pos[2] & 0xf0) << 13) + 0xc0000);
printk(KERN_DEBUG " port-offset=0x%x, subsystem=%s\n", ((pos[2] & 0x0e) << 2), (pos[2] & 1) ? "enabled." : "disabled.");
/* register the hostadapter */
if ((shpnt = ibmmca_register(scsi_template, port, id, i, subsys_list[i].description))) {
for (k = 2; k < 8; k++)
((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = pos[k];
((struct ibmmca_hostdata *) shpnt->hostdata)->_special = i;
mca_set_adapter_name(slot, subsys_list[i].description);
mca_set_adapter_procfn(slot, (MCA_ProcFn) ibmmca_getinfo, shpnt);
mca_mark_as_used(slot);
if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0))
devices_on_irq_11++;
else
devices_on_irq_14++;
}
slot++; /* advance to next slot */
} /* advance to next adapter id in the list of IBM-SCSI-subsystems */
}
/* now check for SCSI-adapters, mapped to the integrated SCSI
* area. E.g. a W/Cache in MCA-slot 9(!). Do the check correct here,
* as this is a known effect on some models 95xx. */
for (i = 0; i < ARRAY_SIZE(subsys_list); i++) {
/* scan each slot for a fitting adapter id */
slot = mca_find_adapter(subsys_list[i].mca_id, MCA_INTEGSCSI);
if (slot != MCA_NOTFOUND) { /* scan through all slots */
for (j = 0; j < 8; j++) /* read the pos-information */
pos[j] = mca_read_stored_pos(slot, j);
if ((pos[2] & 1) == 1) { /* is the subsystem chip enabled ? */
/* (explanations see above) */
port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
} else { /* anyway, set the portnumber and warn */
port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
printk(KERN_WARNING "IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n");
printk(KERN_WARNING " SCSI-operations may not work.\n");
}
if ((i == IBM_SCSI2_FW) && (pos[6] != 0)) {
printk(KERN_ERR "IBM MCA SCSI: ERROR - Wrong POS(6)-register setting!\n");
printk(KERN_ERR " Impossible to determine adapter PUN!\n");
printk(KERN_ERR " Guessing adapter PUN = 7.\n");
id = 7;
} else {
id = (pos[3] & 0xe0) >> 5; /* get subsystem PUN */
if (i == IBM_SCSI2_FW)
id |= (pos[3] & 0x10) >> 1; /* get subsystem PUN high-bit
* for F/W adapters */
}
if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0)) {
/* IRQ11 is used by SCSI-2 F/W Adapter/A */
printk(KERN_DEBUG "IBM MCA SCSI: SCSI-2 F/W adapter needs IRQ 11.\n");
/* get interrupt request level */
if (request_irq(IM_IRQ_FW, interrupt_handler, IRQF_SHARED, "ibmmcascsi", hosts))
printk(KERN_ERR "IBM MCA SCSI: Unable to get shared IRQ %d.\n", IM_IRQ_FW);
else
IRQ11_registered++;
}
printk(KERN_INFO "IBM MCA SCSI: %s found in slot %d, io=0x%x, scsi id=%d,\n", subsys_list[i].description, slot + 1, port, id);
if ((pos[2] & 0xf0) == 0xf0)
printk(KERN_DEBUG " ROM Addr.=off,");
else
printk(KERN_DEBUG " ROM Addr.=0x%x,", ((pos[2] & 0xf0) << 13) + 0xc0000);
printk(KERN_DEBUG " port-offset=0x%x, subsystem=%s\n", ((pos[2] & 0x0e) << 2), (pos[2] & 1) ? "enabled." : "disabled.");
/* register the hostadapter */
if ((shpnt = ibmmca_register(scsi_template, port, id, i, subsys_list[i].description))) {
for (k = 2; k < 7; k++)
((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = pos[k];
((struct ibmmca_hostdata *) shpnt->hostdata)->_special = i;
mca_set_adapter_name(slot, subsys_list[i].description);
mca_set_adapter_procfn(slot, (MCA_ProcFn) ibmmca_getinfo, shpnt);
mca_mark_as_used(slot);
if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0))
devices_on_irq_11++;
else
devices_on_irq_14++;
}
slot++; /* advance to next slot */
} /* advance to next adapter id in the list of IBM-SCSI-subsystems */
}
if (IRQ11_registered && !devices_on_irq_11)
free_irq(IM_IRQ_FW, hosts); /* no devices on IRQ 11 */
if (IRQ14_registered && !devices_on_irq_14)
free_irq(IM_IRQ, hosts); /* no devices on IRQ 14 */
if (!devices_on_irq_11 && !devices_on_irq_14)
printk(KERN_WARNING "IBM MCA SCSI: No IBM SCSI-subsystem adapter attached.\n");
return found; /* return the number of found SCSI hosts. Should be 1 or 0. */
}
static struct Scsi_Host *ibmmca_register(struct scsi_host_template * scsi_template, int port, int id, int adaptertype, char *hostname)
{
struct Scsi_Host *shpnt;
int i, j;
unsigned int ctrl;
/* check I/O region */
if (!request_region(port, IM_N_IO_PORT, hostname)) {
printk(KERN_ERR "IBM MCA SCSI: Unable to get I/O region 0x%x-0x%x (%d ports).\n", port, port + IM_N_IO_PORT - 1, IM_N_IO_PORT);
return NULL;
}
/* register host */
shpnt = scsi_register(scsi_template, sizeof(struct ibmmca_hostdata));
if (!shpnt) {
printk(KERN_ERR "IBM MCA SCSI: Unable to register host.\n");
release_region(port, IM_N_IO_PORT);
return NULL;
}
/* request I/O region */
hosts[found] = shpnt; /* add new found hostadapter to the list */
special(found) = adaptertype; /* important assignment or else crash! */
subsystem_connector_size(found) = 0; /* preset slot-size */
shpnt->irq = IM_IRQ; /* assign necessary stuff for the adapter */
shpnt->io_port = port;
shpnt->n_io_port = IM_N_IO_PORT;
shpnt->this_id = id;
shpnt->max_id = 8; /* 8 PUNs are default */
/* now, the SCSI-subsystem is connected to Linux */
ctrl = (unsigned int) (inb(IM_CTR_REG(found))); /* get control-register status */
#ifdef IM_DEBUG_PROBE
printk("IBM MCA SCSI: Control Register contents: %x, status: %x\n", ctrl, inb(IM_STAT_REG(found)));
printk("IBM MCA SCSI: This adapters' POS-registers: ");
for (i = 0; i < 8; i++)
printk("%x ", pos[i]);
printk("\n");
#endif
reset_status(found) = IM_RESET_NOT_IN_PROGRESS;
for (i = 0; i < 16; i++) /* reset the tables */
for (j = 0; j < 8; j++)
get_ldn(found)[i][j] = MAX_LOG_DEV;
/* check which logical devices exist */
/* after this line, local interrupting is possible: */
local_checking_phase_flag(found) = 1;
check_devices(found, adaptertype); /* call by value, using the global variable hosts */
local_checking_phase_flag(found) = 0;
found++; /* now increase index to be prepared for next found subsystem */
/* an ibm mca subsystem has been detected */
return shpnt;
}
static int ibmmca_release(struct Scsi_Host *shpnt)
{
release_region(shpnt->io_port, shpnt->n_io_port);
if (!(--found))
free_irq(shpnt->irq, hosts);
return 0;
}
/* The following routine is the SCSI command queue for the midlevel driver */
static int ibmmca_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
{
unsigned int ldn;
unsigned int scsi_cmd;
struct im_scb *scb;
struct Scsi_Host *shpnt;
int current_ldn;
int id, lun;
int target;
int host_index;
int max_pun;
int i;
struct scatterlist *sl;
shpnt = cmd->device->host;
/* search for the right hostadapter */
for (host_index = 0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);
if (!hosts[host_index]) { /* invalid hostadapter descriptor address */
cmd->result = DID_NO_CONNECT << 16;
if (done)
done(cmd);
return 0;
}
max_pun = subsystem_maxid(host_index);
if (ibm_ansi_order) {
target = max_pun - 1 - cmd->device->id;
if ((target <= subsystem_pun(host_index)) && (cmd->device->id <= subsystem_pun(host_index)))
target--;
else if ((target >= subsystem_pun(host_index)) && (cmd->device->id >= subsystem_pun(host_index)))
target++;
} else
target = cmd->device->id;
/* if (target,lun) is NO LUN or not existing at all, return error */
if ((get_scsi(host_index)[target][cmd->device->lun] == TYPE_NO_LUN) || (get_scsi(host_index)[target][cmd->device->lun] == TYPE_NO_DEVICE)) {
cmd->result = DID_NO_CONNECT << 16;
if (done)
done(cmd);
return 0;
}
/*if (target,lun) unassigned, do further checks... */
ldn = get_ldn(host_index)[target][cmd->device->lun];
if (ldn >= MAX_LOG_DEV) { /* on invalid ldn do special stuff */
if (ldn > MAX_LOG_DEV) { /* dynamical remapping if ldn unassigned */
current_ldn = next_ldn(host_index); /* stop-value for one circle */
while (ld(host_index)[next_ldn(host_index)].cmd) { /* search for a occupied, but not in */
/* command-processing ldn. */
next_ldn(host_index)++;
if (next_ldn(host_index) >= MAX_LOG_DEV)
next_ldn(host_index) = 7;
if (current_ldn == next_ldn(host_index)) { /* One circle done ? */
/* no non-processing ldn found */
scmd_printk(KERN_WARNING, cmd,
"IBM MCA SCSI: Cannot assign SCSI-device dynamically!\n"
" On ldn 7-14 SCSI-commands everywhere in progress.\n"
" Reporting DID_NO_CONNECT for device.\n");
cmd->result = DID_NO_CONNECT << 16; /* return no connect */
if (done)
done(cmd);
return 0;
}
}
/* unmap non-processing ldn */
for (id = 0; id < max_pun; id++)
for (lun = 0; lun < 8; lun++) {
if (get_ldn(host_index)[id][lun] == next_ldn(host_index)) {
get_ldn(host_index)[id][lun] = TYPE_NO_DEVICE;
get_scsi(host_index)[id][lun] = TYPE_NO_DEVICE;
/* unmap entry */
}
}
/* set reduced interrupt_handler-mode for checking */
local_checking_phase_flag(host_index) = 1;
/* map found ldn to pun,lun */
get_ldn(host_index)[target][cmd->device->lun] = next_ldn(host_index);
/* change ldn to the right value, that is now next_ldn */
ldn = next_ldn(host_index);
/* unassign all ldns (pun,lun,ldn does not matter for remove) */
immediate_assign(host_index, 0, 0, 0, REMOVE_LDN);
/* set only LDN for remapped device */
immediate_assign(host_index, target, cmd->device->lun, ldn, SET_LDN);
/* get device information for ld[ldn] */
if (device_exists(host_index, ldn, &ld(host_index)[ldn].block_length, &ld(host_index)[ldn].device_type)) {
ld(host_index)[ldn].cmd = NULL; /* To prevent panic set 0, because
devices that were not assigned,
should have nothing in progress. */
get_scsi(host_index)[target][cmd->device->lun] = ld(host_index)[ldn].device_type;
/* increase assignment counters for statistics in /proc */
IBM_DS(host_index).dynamical_assignments++;
IBM_DS(host_index).ldn_assignments[ldn]++;
} else
/* panic here, because a device, found at boottime has
vanished */
panic("IBM MCA SCSI: ldn=0x%x, SCSI-device on (%d,%d) vanished!\n", ldn, target, cmd->device->lun);
/* unassign again all ldns (pun,lun,ldn does not matter for remove) */
immediate_assign(host_index, 0, 0, 0, REMOVE_LDN);
/* remap all ldns, as written in the pun/lun table */
lun = 0;
#ifdef CONFIG_SCSI_MULTI_LUN
for (lun = 0; lun < 8; lun++)
#endif
for (id = 0; id < max_pun; id++) {
if (get_ldn(host_index)[id][lun] <= MAX_LOG_DEV)
immediate_assign(host_index, id, lun, get_ldn(host_index)[id][lun], SET_LDN);
}
/* set back to normal interrupt_handling */
local_checking_phase_flag(host_index) = 0;
#ifdef IM_DEBUG_PROBE
/* Information on syslog terminal */
printk("IBM MCA SCSI: ldn=0x%x dynamically reassigned to (%d,%d).\n", ldn, target, cmd->device->lun);
#endif
/* increase next_ldn for next dynamical assignment */
next_ldn(host_index)++;
if (next_ldn(host_index) >= MAX_LOG_DEV)
next_ldn(host_index) = 7;
} else { /* wall against Linux accesses to the subsystem adapter */
cmd->result = DID_BAD_TARGET << 16;
if (done)
done(cmd);
return 0;
}
}
/*verify there is no command already in progress for this log dev */
if (ld(host_index)[ldn].cmd)
panic("IBM MCA SCSI: cmd already in progress for this ldn.\n");
/*save done in cmd, and save cmd for the interrupt handler */
cmd->scsi_done = done;
ld(host_index)[ldn].cmd = cmd;
/*fill scb information independent of the scsi command */
scb = &(ld(host_index)[ldn].scb);
ld(host_index)[ldn].tsb.dev_status = 0;
scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_RETRY_ENABLE;
scb->tsb_adr = isa_virt_to_bus(&(ld(host_index)[ldn].tsb));
scsi_cmd = cmd->cmnd[0];
if (cmd->use_sg) {
i = cmd->use_sg;
sl = (struct scatterlist *) (cmd->request_buffer);
if (i > 16)
panic("IBM MCA SCSI: scatter-gather list too long.\n");
while (--i >= 0) {
ld(host_index)[ldn].sge[i].address = (void *) (isa_page_to_bus(sl[i].page) + sl[i].offset);
ld(host_index)[ldn].sge[i].byte_length = sl[i].length;
}
scb->enable |= IM_POINTER_TO_LIST;
scb->sys_buf_adr = isa_virt_to_bus(&(ld(host_index)[ldn].sge[0]));
scb->sys_buf_length = cmd->use_sg * sizeof(struct im_sge);
} else {
scb->sys_buf_adr = isa_virt_to_bus(cmd->request_buffer);
/* recent Linux midlevel SCSI places 1024 byte for inquiry
* command. Far too much for old PS/2 hardware. */
switch (scsi_cmd) {
/* avoid command errors by setting bufferlengths to
* ANSI-standard. Beware of forcing it to 255,
* this could SEGV the kernel!!! */
case INQUIRY:
case REQUEST_SENSE:
case MODE_SENSE:
case MODE_SELECT:
if (cmd->request_bufflen > 255)
scb->sys_buf_length = 255;
else
scb->sys_buf_length = cmd->request_bufflen;
break;
case TEST_UNIT_READY:
scb->sys_buf_length = 0;
break;
default:
scb->sys_buf_length = cmd->request_bufflen;
break;
}
}
/*fill scb information dependent on scsi command */
#ifdef IM_DEBUG_CMD
printk("issue scsi cmd=%02x to ldn=%d\n", scsi_cmd, ldn);
#endif
/* for specific device-type debugging: */
#ifdef IM_DEBUG_CMD_SPEC_DEV
if (ld(host_index)[ldn].device_type == IM_DEBUG_CMD_DEVICE)
printk("(SCSI-device-type=0x%x) issue scsi cmd=%02x to ldn=%d\n", ld(host_index)[ldn].device_type, scsi_cmd, ldn);
#endif
/* for possible panics store current command */
last_scsi_command(host_index)[ldn] = scsi_cmd;
last_scsi_type(host_index)[ldn] = IM_SCB;
/* update statistical info */
IBM_DS(host_index).total_accesses++;
IBM_DS(host_index).ldn_access[ldn]++;
switch (scsi_cmd) {
case READ_6:
case WRITE_6:
case READ_10:
case WRITE_10:
case READ_12:
case WRITE_12:
/* Distinguish between disk and other devices. Only disks (that are the
most frequently accessed devices) should be supported by the
IBM-SCSI-Subsystem commands. */
switch (ld(host_index)[ldn].device_type) {
case TYPE_DISK: /* for harddisks enter here ... */
case TYPE_MOD: /* ... try it also for MO-drives (send flames as */
/* you like, if this won't work.) */
if (scsi_cmd == READ_6 || scsi_cmd == READ_10 || scsi_cmd == READ_12) {
/* read command preparations */
scb->enable |= IM_READ_CONTROL;
IBM_DS(host_index).ldn_read_access[ldn]++; /* increase READ-access on ldn stat. */
scb->command = IM_READ_DATA_CMD | IM_NO_DISCONNECT;
} else { /* write command preparations */
IBM_DS(host_index).ldn_write_access[ldn]++; /* increase write-count on ldn stat. */
scb->command = IM_WRITE_DATA_CMD | IM_NO_DISCONNECT;
}
if (scsi_cmd == READ_6 || scsi_cmd == WRITE_6) {
scb->u1.log_blk_adr = (((unsigned) cmd->cmnd[3]) << 0) | (((unsigned) cmd->cmnd[2]) << 8) | ((((unsigned) cmd->cmnd[1]) & 0x1f) << 16);
scb->u2.blk.count = (unsigned) cmd->cmnd[4];
} else {
scb->u1.log_blk_adr = (((unsigned) cmd->cmnd[5]) << 0) | (((unsigned) cmd->cmnd[4]) << 8) | (((unsigned) cmd->cmnd[3]) << 16) | (((unsigned) cmd->cmnd[2]) << 24);
scb->u2.blk.count = (((unsigned) cmd->cmnd[8]) << 0) | (((unsigned) cmd->cmnd[7]) << 8);
}
last_scsi_logical_block(host_index)[ldn] = scb->u1.log_blk_adr;
last_scsi_blockcount(host_index)[ldn] = scb->u2.blk.count;
scb->u2.blk.length = ld(host_index)[ldn].block_length;
break;
/* for other devices, enter here. Other types are not known by
Linux! TYPE_NO_LUN is forbidden as valid device. */
case TYPE_ROM:
case TYPE_TAPE:
case TYPE_PROCESSOR:
case TYPE_WORM:
case TYPE_SCANNER:
case TYPE_MEDIUM_CHANGER:
/* If there is a sequential-device, IBM recommends to use
IM_OTHER_SCSI_CMD_CMD instead of subsystem READ/WRITE.
This includes CD-ROM devices, too, due to the partial sequential
read capabilities. */
scb->command = IM_OTHER_SCSI_CMD_CMD;
if (scsi_cmd == READ_6 || scsi_cmd == READ_10 || scsi_cmd == READ_12)
/* enable READ */
scb->enable |= IM_READ_CONTROL;
scb->enable |= IM_BYPASS_BUFFER;
scb->u1.scsi_cmd_length = cmd->cmd_len;
memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
/* Read/write on this non-disk devices is also displayworthy,
so flash-up the LED/display. */
break;
}
break;
case INQUIRY:
IBM_DS(host_index).ldn_inquiry_access[ldn]++;
scb->command = IM_DEVICE_INQUIRY_CMD;
scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
scb->u1.log_blk_adr = 0;
break;
case TEST_UNIT_READY:
scb->command = IM_OTHER_SCSI_CMD_CMD;
scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
scb->u1.log_blk_adr = 0;
scb->u1.scsi_cmd_length = 6;
memcpy(scb->u2.scsi_command, cmd->cmnd, 6);
last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
break;
case READ_CAPACITY:
/* the length of system memory buffer must be exactly 8 bytes */
scb->command = IM_READ_CAPACITY_CMD;
scb->enable |= IM_READ_CONTROL | IM_BYPASS_BUFFER;
if (scb->sys_buf_length > 8)
scb->sys_buf_length = 8;
break;
/* Commands that need read-only-mode (system <- device): */
case REQUEST_SENSE:
scb->command = IM_REQUEST_SENSE_CMD;
scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
break;
/* Commands that need write-only-mode (system -> device): */
case MODE_SELECT:
case MODE_SELECT_10:
IBM_DS(host_index).ldn_modeselect_access[ldn]++;
scb->command = IM_OTHER_SCSI_CMD_CMD;
scb->enable |= IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER; /*Select needs WRITE-enabled */
scb->u1.scsi_cmd_length = cmd->cmd_len;
memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
break;
/* For other commands, read-only is useful. Most other commands are
running without an input-data-block. */
default:
scb->command = IM_OTHER_SCSI_CMD_CMD;
scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
scb->u1.scsi_cmd_length = cmd->cmd_len;
memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
break;
}
/*issue scb command, and return */
if (++disk_rw_in_progress == 1)
PS2_DISK_LED_ON(shpnt->host_no, target);
if (last_scsi_type(host_index)[ldn] == IM_LONG_SCB) {
issue_cmd(host_index, isa_virt_to_bus(scb), IM_LONG_SCB | ldn);
IBM_DS(host_index).long_scbs++;
} else {
issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | ldn);
IBM_DS(host_index).scbs++;
}
return 0;
}
static int __ibmmca_abort(Scsi_Cmnd * cmd)
{
/* Abort does not work, as the adapter never generates an interrupt on
* whatever situation is simulated, even when really pending commands
* are running on the adapters' hardware ! */
struct Scsi_Host *shpnt;
unsigned int ldn;
void (*saved_done) (Scsi_Cmnd *);
int target;
int host_index;
int max_pun;
unsigned long imm_command;
#ifdef IM_DEBUG_PROBE
printk("IBM MCA SCSI: Abort subroutine called...\n");
#endif
shpnt = cmd->device->host;
/* search for the right hostadapter */
for (host_index = 0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);
if (!hosts[host_index]) { /* invalid hostadapter descriptor address */
cmd->result = DID_NO_CONNECT << 16;
if (cmd->scsi_done)
(cmd->scsi_done) (cmd);
shpnt = cmd->device->host;
#ifdef IM_DEBUG_PROBE
printk(KERN_DEBUG "IBM MCA SCSI: Abort adapter selection failed!\n");
#endif
return SUCCESS;
}
max_pun = subsystem_maxid(host_index);
if (ibm_ansi_order) {
target = max_pun - 1 - cmd->device->id;
if ((target <= subsystem_pun(host_index)) && (cmd->device->id <= subsystem_pun(host_index)))
target--;
else if ((target >= subsystem_pun(host_index)) && (cmd->device->id >= subsystem_pun(host_index)))
target++;
} else
target = cmd->device->id;
/* get logical device number, and disable system interrupts */
printk(KERN_WARNING "IBM MCA SCSI: Sending abort to device pun=%d, lun=%d.\n", target, cmd->device->lun);
ldn = get_ldn(host_index)[target][cmd->device->lun];
/*if cmd for this ldn has already finished, no need to abort */
if (!ld(host_index)[ldn].cmd) {
return SUCCESS;
}
/* Clear ld.cmd, save done function, install internal done,
* send abort immediate command (this enables sys. interrupts),
* and wait until the interrupt arrives.
*/
saved_done = cmd->scsi_done;
cmd->scsi_done = internal_done;
cmd->SCp.Status = 0;
last_scsi_command(host_index)[ldn] = IM_ABORT_IMM_CMD;
last_scsi_type(host_index)[ldn] = IM_IMM_CMD;
imm_command = inl(IM_CMD_REG(host_index));
imm_command &= (unsigned long) (0xffff0000); /* mask reserved stuff */
imm_command |= (unsigned long) (IM_ABORT_IMM_CMD);
/* must wait for attention reg not busy */
/* FIXME - timeout, politeness */
while (1) {
if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
break;
}
/* write registers and enable system interrupts */
outl(imm_command, IM_CMD_REG(host_index));
outb(IM_IMM_CMD | ldn, IM_ATTN_REG(host_index));
#ifdef IM_DEBUG_PROBE
printk("IBM MCA SCSI: Abort queued to adapter...\n");
#endif
spin_unlock_irq(shpnt->host_lock);
while (!cmd->SCp.Status)
yield();
spin_lock_irq(shpnt->host_lock);
cmd->scsi_done = saved_done;
#ifdef IM_DEBUG_PROBE
printk("IBM MCA SCSI: Abort returned with adapter response...\n");
#endif
/*if abort went well, call saved done, then return success or error */
if (cmd->result == (DID_ABORT << 16))
{
cmd->result |= DID_ABORT << 16;
if (cmd->scsi_done)
(cmd->scsi_done) (cmd);
ld(host_index)[ldn].cmd = NULL;
#ifdef IM_DEBUG_PROBE
printk("IBM MCA SCSI: Abort finished with success.\n");
#endif
return SUCCESS;
} else {
cmd->result |= DID_NO_CONNECT << 16;
if (cmd->scsi_done)
(cmd->scsi_done) (cmd);
ld(host_index)[ldn].cmd = NULL;
#ifdef IM_DEBUG_PROBE
printk("IBM MCA SCSI: Abort failed.\n");
#endif
return FAILED;
}
}
static int ibmmca_abort(Scsi_Cmnd * cmd)
{
struct Scsi_Host *shpnt = cmd->device->host;
int rc;
spin_lock_irq(shpnt->host_lock);
rc = __ibmmca_abort(cmd);
spin_unlock_irq(shpnt->host_lock);
return rc;
}
static int __ibmmca_host_reset(Scsi_Cmnd * cmd)
{
struct Scsi_Host *shpnt;
Scsi_Cmnd *cmd_aid;
int ticks, i;
int host_index;
unsigned long imm_command;
BUG_ON(cmd == NULL);
ticks = IM_RESET_DELAY * HZ;
shpnt = cmd->device->host;
/* search for the right hostadapter */
for (host_index = 0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);
if (!hosts[host_index]) /* invalid hostadapter descriptor address */
return FAILED;
if (local_checking_phase_flag(host_index)) {
printk(KERN_WARNING "IBM MCA SCSI: unable to reset while checking devices.\n");
return FAILED;
}
/* issue reset immediate command to subsystem, and wait for interrupt */
printk("IBM MCA SCSI: resetting all devices.\n");
reset_status(host_index) = IM_RESET_IN_PROGRESS;
last_scsi_command(host_index)[0xf] = IM_RESET_IMM_CMD;
last_scsi_type(host_index)[0xf] = IM_IMM_CMD;
imm_command = inl(IM_CMD_REG(host_index));
imm_command &= (unsigned long) (0xffff0000); /* mask reserved stuff */
imm_command |= (unsigned long) (IM_RESET_IMM_CMD);
/* must wait for attention reg not busy */
while (1) {
if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
break;
spin_unlock_irq(shpnt->host_lock);
yield();
spin_lock_irq(shpnt->host_lock);
}
/*write registers and enable system interrupts */
outl(imm_command, IM_CMD_REG(host_index));
outb(IM_IMM_CMD | 0xf, IM_ATTN_REG(host_index));
/* wait for interrupt finished or intr_stat register to be set, as the
* interrupt will not be executed, while we are in here! */
/* FIXME: This is really really icky we so want a sleeping version of this ! */
while (reset_status(host_index) == IM_RESET_IN_PROGRESS && --ticks && ((inb(IM_INTR_REG(host_index)) & 0x8f) != 0x8f)) {
udelay((1 + 999 / HZ) * 1000);
barrier();
}
/* if reset did not complete, just return an error */
if (!ticks) {
printk(KERN_ERR "IBM MCA SCSI: reset did not complete within %d seconds.\n", IM_RESET_DELAY);
reset_status(host_index) = IM_RESET_FINISHED_FAIL;
return FAILED;
}
if ((inb(IM_INTR_REG(host_index)) & 0x8f) == 0x8f) {
/* analysis done by this routine and not by the intr-routine */
if (inb(IM_INTR_REG(host_index)) == 0xaf)
reset_status(host_index) = IM_RESET_FINISHED_OK_NO_INT;
else if (inb(IM_INTR_REG(host_index)) == 0xcf)
reset_status(host_index) = IM_RESET_FINISHED_FAIL;
else /* failed, 4get it */
reset_status(host_index) = IM_RESET_NOT_IN_PROGRESS_NO_INT;
outb(IM_EOI | 0xf, IM_ATTN_REG(host_index));
}
/* if reset failed, just return an error */
if (reset_status(host_index) == IM_RESET_FINISHED_FAIL) {
printk(KERN_ERR "IBM MCA SCSI: reset failed.\n");
return FAILED;
}
/* so reset finished ok - call outstanding done's, and return success */
printk(KERN_INFO "IBM MCA SCSI: Reset successfully completed.\n");
for (i = 0; i < MAX_LOG_DEV; i++) {
cmd_aid = ld(host_index)[i].cmd;
if (cmd_aid && cmd_aid->scsi_done) {
ld(host_index)[i].cmd = NULL;
cmd_aid->result = DID_RESET << 16;
}
}
return SUCCESS;
}
static int ibmmca_host_reset(Scsi_Cmnd * cmd)
{
struct Scsi_Host *shpnt = cmd->device->host;
int rc;
spin_lock_irq(shpnt->host_lock);
rc = __ibmmca_host_reset(cmd);
spin_unlock_irq(shpnt->host_lock);
return rc;
}
static int ibmmca_biosparam(struct scsi_device *sdev, struct block_device *bdev, sector_t capacity, int *info)
{
int size = capacity;
info[0] = 64;
info[1] = 32;
info[2] = size / (info[0] * info[1]);
if (info[2] >= 1024) {
info[0] = 128;
info[1] = 63;
info[2] = size / (info[0] * info[1]);
if (info[2] >= 1024) {
info[0] = 255;
info[1] = 63;
info[2] = size / (info[0] * info[1]);
if (info[2] >= 1024)
info[2] = 1023;
}
}
return 0;
}
/* calculate percentage of total accesses on a ldn */
static int ldn_access_load(int host_index, int ldn)
{
if (IBM_DS(host_index).total_accesses == 0)
return (0);
if (IBM_DS(host_index).ldn_access[ldn] == 0)
return (0);
return (IBM_DS(host_index).ldn_access[ldn] * 100) / IBM_DS(host_index).total_accesses;
}
/* calculate total amount of r/w-accesses */
static int ldn_access_total_read_write(int host_index)
{
int a;
int i;
a = 0;
for (i = 0; i <= MAX_LOG_DEV; i++)
a += IBM_DS(host_index).ldn_read_access[i] + IBM_DS(host_index).ldn_write_access[i];
return (a);
}
static int ldn_access_total_inquiry(int host_index)
{
int a;
int i;
a = 0;
for (i = 0; i <= MAX_LOG_DEV; i++)
a += IBM_DS(host_index).ldn_inquiry_access[i];
return (a);
}
static int ldn_access_total_modeselect(int host_index)
{
int a;
int i;
a = 0;
for (i = 0; i <= MAX_LOG_DEV; i++)
a += IBM_DS(host_index).ldn_modeselect_access[i];
return (a);
}
/* routine to display info in the proc-fs-structure (a deluxe feature) */
static int ibmmca_proc_info(struct Scsi_Host *shpnt, char *buffer, char **start, off_t offset, int length, int inout)
{
int len = 0;
int i, id, lun, host_index;
unsigned long flags;
int max_pun;
for (i = 0; hosts[i] && hosts[i] != shpnt; i++);
spin_lock_irqsave(hosts[i]->host_lock, flags); /* Check it */
host_index = i;
if (!shpnt) {
len += sprintf(buffer + len, "\nIBM MCA SCSI: Can't find adapter");
return len;
}
max_pun = subsystem_maxid(host_index);
len += sprintf(buffer + len, "\n IBM-SCSI-Subsystem-Linux-Driver, Version %s\n\n\n", IBMMCA_SCSI_DRIVER_VERSION);
len += sprintf(buffer + len, " SCSI Access-Statistics:\n");
len += sprintf(buffer + len, " Device Scanning Order....: %s\n", (ibm_ansi_order) ? "IBM/ANSI" : "New Industry Standard");
#ifdef CONFIG_SCSI_MULTI_LUN
len += sprintf(buffer + len, " Multiple LUN probing.....: Yes\n");
#else
len += sprintf(buffer + len, " Multiple LUN probing.....: No\n");
#endif
len += sprintf(buffer + len, " This Hostnumber..........: %d\n", shpnt->host_no);
len += sprintf(buffer + len, " Base I/O-Port............: 0x%x\n", (unsigned int) (IM_CMD_REG(host_index)));
len += sprintf(buffer + len, " (Shared) IRQ.............: %d\n", IM_IRQ);
len += sprintf(buffer + len, " Total Interrupts.........: %d\n", IBM_DS(host_index).total_interrupts);
len += sprintf(buffer + len, " Total SCSI Accesses......: %d\n", IBM_DS(host_index).total_accesses);
len += sprintf(buffer + len, " Total short SCBs.........: %d\n", IBM_DS(host_index).scbs);
len += sprintf(buffer + len, " Total long SCBs..........: %d\n", IBM_DS(host_index).long_scbs);
len += sprintf(buffer + len, " Total SCSI READ/WRITE..: %d\n", ldn_access_total_read_write(host_index));
len += sprintf(buffer + len, " Total SCSI Inquiries...: %d\n", ldn_access_total_inquiry(host_index));
len += sprintf(buffer + len, " Total SCSI Modeselects.: %d\n", ldn_access_total_modeselect(host_index));
len += sprintf(buffer + len, " Total SCSI other cmds..: %d\n", IBM_DS(host_index).total_accesses - ldn_access_total_read_write(host_index)
- ldn_access_total_modeselect(host_index)
- ldn_access_total_inquiry(host_index));
len += sprintf(buffer + len, " Total SCSI command fails.: %d\n\n", IBM_DS(host_index).total_errors);
len += sprintf(buffer + len, " Logical-Device-Number (LDN) Access-Statistics:\n");
len += sprintf(buffer + len, " LDN | Accesses [%%] | READ | WRITE | ASSIGNMENTS\n");
len += sprintf(buffer + len, " -----|--------------|-----------|-----------|--------------\n");
for (i = 0; i <= MAX_LOG_DEV; i++)
len += sprintf(buffer + len, " %2X | %3d | %8d | %8d | %8d\n", i, ldn_access_load(host_index, i), IBM_DS(host_index).ldn_read_access[i], IBM_DS(host_index).ldn_write_access[i], IBM_DS(host_index).ldn_assignments[i]);
len += sprintf(buffer + len, " -----------------------------------------------------------\n\n");
len += sprintf(buffer + len, " Dynamical-LDN-Assignment-Statistics:\n");
len += sprintf(buffer + len, " Number of physical SCSI-devices..: %d (+ Adapter)\n", IBM_DS(host_index).total_scsi_devices);
len += sprintf(buffer + len, " Dynamical Assignment necessary...: %s\n", IBM_DS(host_index).dyn_flag ? "Yes" : "No ");
len += sprintf(buffer + len, " Next LDN to be assigned..........: 0x%x\n", next_ldn(host_index));
len += sprintf(buffer + len, " Dynamical assignments done yet...: %d\n", IBM_DS(host_index).dynamical_assignments);
len += sprintf(buffer + len, "\n Current SCSI-Device-Mapping:\n");
len += sprintf(buffer + len, " Physical SCSI-Device Map Logical SCSI-Device Map\n");
len += sprintf(buffer + len, " ID\\LUN 0 1 2 3 4 5 6 7 ID\\LUN 0 1 2 3 4 5 6 7\n");
for (id = 0; id < max_pun; id++) {
len += sprintf(buffer + len, " %2d ", id);
for (lun = 0; lun < 8; lun++)
len += sprintf(buffer + len, "%2s ", ti_p(get_scsi(host_index)[id][lun]));
len += sprintf(buffer + len, " %2d ", id);
for (lun = 0; lun < 8; lun++)
len += sprintf(buffer + len, "%2s ", ti_l(get_ldn(host_index)[id][lun]));
len += sprintf(buffer + len, "\n");
}
len += sprintf(buffer + len, "(A = IBM-Subsystem, D = Harddisk, T = Tapedrive, P = Processor, W = WORM,\n");
len += sprintf(buffer + len, " R = CD-ROM, S = Scanner, M = MO-Drive, C = Medium-Changer, + = unprovided LUN,\n");
len += sprintf(buffer + len, " - = nothing found, nothing assigned or unprobed LUN)\n\n");
*start = buffer + offset;
len -= offset;
if (len > length)
len = length;
spin_unlock_irqrestore(shpnt->host_lock, flags);
return len;
}
static int option_setup(char *str)
{
int ints[IM_MAX_HOSTS];
char *cur = str;
int i = 1;
while (cur && isdigit(*cur) && i <= IM_MAX_HOSTS) {
ints[i++] = simple_strtoul(cur, NULL, 0);
if ((cur = strchr(cur, ',')) != NULL)
cur++;
}
ints[0] = i - 1;
internal_ibmmca_scsi_setup(cur, ints);
return 1;
}
__setup("ibmmcascsi=", option_setup);
static struct scsi_host_template driver_template = {
.proc_name = "ibmmca",
.proc_info = ibmmca_proc_info,
.name = "IBM SCSI-Subsystem",
.detect = ibmmca_detect,
.release = ibmmca_release,
.queuecommand = ibmmca_queuecommand,
.eh_abort_handler = ibmmca_abort,
.eh_host_reset_handler = ibmmca_host_reset,
.bios_param = ibmmca_biosparam,
.can_queue = 16,
.this_id = 7,
.sg_tablesize = 16,
.cmd_per_lun = 1,
.use_clustering = ENABLE_CLUSTERING,
};
#include "scsi_module.c"
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