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linux / linux / kernel / git / torvalds / linux / refs/tags/v2.6.12-rc5 / . / drivers / scsi / dc395x.c
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/*
* dc395x.c
*
* Device Driver for Tekram DC395(U/UW/F), DC315(U)
* PCI SCSI Bus Master Host Adapter
* (SCSI chip set used Tekram ASIC TRM-S1040)
*
* Authors:
* C.L. Huang <ching@tekram.com.tw>
* Erich Chen <erich@tekram.com.tw>
* (C) Copyright 1995-1999 Tekram Technology Co., Ltd.
*
* Kurt Garloff <garloff@suse.de>
* (C) 1999-2000 Kurt Garloff
*
* Oliver Neukum <oliver@neukum.name>
* Ali Akcaagac <aliakc@web.de>
* Jamie Lenehan <lenehan@twibble.org>
* (C) 2003
*
* License: GNU GPL
*
*************************************************************************
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
************************************************************************
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/delay.h>
#include <linux/ctype.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/pci.h>
#include <linux/list.h>
#include <linux/vmalloc.h>
#include <asm/io.h>
#include <scsi/scsi.h>
#include <scsi/scsicam.h> /* needed for scsicam_bios_param */
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include "dc395x.h"
#define DC395X_NAME "dc395x"
#define DC395X_BANNER "Tekram DC395(U/UW/F), DC315(U) - ASIC TRM-S1040"
#define DC395X_VERSION "v2.05, 2004/03/08"
/*---------------------------------------------------------------------------
Features
---------------------------------------------------------------------------*/
/*
* Set to disable parts of the driver
*/
/*#define DC395x_NO_DISCONNECT*/
/*#define DC395x_NO_TAGQ*/
/*#define DC395x_NO_SYNC*/
/*#define DC395x_NO_WIDE*/
/*---------------------------------------------------------------------------
Debugging
---------------------------------------------------------------------------*/
/*
* Types of debugging that can be enabled and disabled
*/
#define DBG_KG 0x0001
#define DBG_0 0x0002
#define DBG_1 0x0004
#define DBG_SG 0x0020
#define DBG_FIFO 0x0040
#define DBG_PIO 0x0080
/*
* Set set of things to output debugging for.
* Undefine to remove all debugging
*/
/*#define DEBUG_MASK (DBG_0|DBG_1|DBG_SG|DBG_FIFO|DBG_PIO)*/
/*#define DEBUG_MASK DBG_0*/
/*
* Output a kernel mesage at the specified level and append the
* driver name and a ": " to the start of the message
*/
#define dprintkl(level, format, arg...) \
printk(level DC395X_NAME ": " format , ## arg)
#ifdef DEBUG_MASK
/*
* print a debug message - this is formated with KERN_DEBUG, then the
* driver name followed by a ": " and then the message is output.
* This also checks that the specified debug level is enabled before
* outputing the message
*/
#define dprintkdbg(type, format, arg...) \
do { \
if ((type) & (DEBUG_MASK)) \
dprintkl(KERN_DEBUG , format , ## arg); \
} while (0)
/*
* Check if the specified type of debugging is enabled
*/
#define debug_enabled(type) ((DEBUG_MASK) & (type))
#else
/*
* No debugging. Do nothing
*/
#define dprintkdbg(type, format, arg...) \
do {} while (0)
#define debug_enabled(type) (0)
#endif
#ifndef PCI_VENDOR_ID_TEKRAM
#define PCI_VENDOR_ID_TEKRAM 0x1DE1 /* Vendor ID */
#endif
#ifndef PCI_DEVICE_ID_TEKRAM_TRMS1040
#define PCI_DEVICE_ID_TEKRAM_TRMS1040 0x0391 /* Device ID */
#endif
#define DC395x_LOCK_IO(dev,flags) spin_lock_irqsave(((struct Scsi_Host *)dev)->host_lock, flags)
#define DC395x_UNLOCK_IO(dev,flags) spin_unlock_irqrestore(((struct Scsi_Host *)dev)->host_lock, flags)
#define DC395x_read8(acb,address) (u8)(inb(acb->io_port_base + (address)))
#define DC395x_read16(acb,address) (u16)(inw(acb->io_port_base + (address)))
#define DC395x_read32(acb,address) (u32)(inl(acb->io_port_base + (address)))
#define DC395x_write8(acb,address,value) outb((value), acb->io_port_base + (address))
#define DC395x_write16(acb,address,value) outw((value), acb->io_port_base + (address))
#define DC395x_write32(acb,address,value) outl((value), acb->io_port_base + (address))
/* cmd->result */
#define RES_TARGET 0x000000FF /* Target State */
#define RES_TARGET_LNX STATUS_MASK /* Only official ... */
#define RES_ENDMSG 0x0000FF00 /* End Message */
#define RES_DID 0x00FF0000 /* DID_ codes */
#define RES_DRV 0xFF000000 /* DRIVER_ codes */
#define MK_RES(drv,did,msg,tgt) ((int)(drv)<<24 | (int)(did)<<16 | (int)(msg)<<8 | (int)(tgt))
#define MK_RES_LNX(drv,did,msg,tgt) ((int)(drv)<<24 | (int)(did)<<16 | (int)(msg)<<8 | (int)(tgt)<<1)
#define SET_RES_TARGET(who,tgt) { who &= ~RES_TARGET; who |= (int)(tgt); }
#define SET_RES_TARGET_LNX(who,tgt) { who &= ~RES_TARGET_LNX; who |= (int)(tgt) << 1; }
#define SET_RES_MSG(who,msg) { who &= ~RES_ENDMSG; who |= (int)(msg) << 8; }
#define SET_RES_DID(who,did) { who &= ~RES_DID; who |= (int)(did) << 16; }
#define SET_RES_DRV(who,drv) { who &= ~RES_DRV; who |= (int)(drv) << 24; }
#define TAG_NONE 255
/*
* srb->segement_x is the hw sg list. It is always allocated as a
* DC395x_MAX_SG_LISTENTRY entries in a linear block which does not
* cross a page boundy.
*/
#define SEGMENTX_LEN (sizeof(struct SGentry)*DC395x_MAX_SG_LISTENTRY)
#define VIRTX_LEN (sizeof(void *) * DC395x_MAX_SG_LISTENTRY)
struct SGentry {
u32 address; /* bus! address */
u32 length;
};
/* The SEEPROM structure for TRM_S1040 */
struct NVRamTarget {
u8 cfg0; /* Target configuration byte 0 */
u8 period; /* Target period */
u8 cfg2; /* Target configuration byte 2 */
u8 cfg3; /* Target configuration byte 3 */
};
struct NvRamType {
u8 sub_vendor_id[2]; /* 0,1 Sub Vendor ID */
u8 sub_sys_id[2]; /* 2,3 Sub System ID */
u8 sub_class; /* 4 Sub Class */
u8 vendor_id[2]; /* 5,6 Vendor ID */
u8 device_id[2]; /* 7,8 Device ID */
u8 reserved; /* 9 Reserved */
struct NVRamTarget target[DC395x_MAX_SCSI_ID];
/** 10,11,12,13
** 14,15,16,17
** ....
** ....
** 70,71,72,73
*/
u8 scsi_id; /* 74 Host Adapter SCSI ID */
u8 channel_cfg; /* 75 Channel configuration */
u8 delay_time; /* 76 Power on delay time */
u8 max_tag; /* 77 Maximum tags */
u8 reserved0; /* 78 */
u8 boot_target; /* 79 */
u8 boot_lun; /* 80 */
u8 reserved1; /* 81 */
u16 reserved2[22]; /* 82,..125 */
u16 cksum; /* 126,127 */
};
struct ScsiReqBlk {
struct list_head list; /* next/prev ptrs for srb lists */
struct DeviceCtlBlk *dcb;
struct scsi_cmnd *cmd;
struct SGentry *segment_x; /* Linear array of hw sg entries (up to 64 entries) */
u32 sg_bus_addr; /* Bus address of sg list (ie, of segment_x) */
u8 sg_count; /* No of HW sg entries for this request */
u8 sg_index; /* Index of HW sg entry for this request */
u32 total_xfer_length; /* Total number of bytes remaining to be transfered */
void **virt_map;
unsigned char *virt_addr; /* Virtual address of current transfer position */
/*
* The sense buffer handling function, request_sense, uses
* the first hw sg entry (segment_x[0]) and the transfer
* length (total_xfer_length). While doing this it stores the
* original values into the last sg hw list
* (srb->segment_x[DC395x_MAX_SG_LISTENTRY - 1] and the
* total_xfer_length in xferred. These values are restored in
* pci_unmap_srb_sense. This is the only place xferred is used.
*/
u32 xferred; /* Saved copy of total_xfer_length */
u16 state;
u8 msgin_buf[6];
u8 msgout_buf[6];
u8 adapter_status;
u8 target_status;
u8 msg_count;
u8 end_message;
u8 tag_number;
u8 status;
u8 retry_count;
u8 flag;
u8 scsi_phase;
};
struct DeviceCtlBlk {
struct list_head list; /* next/prev ptrs for the dcb list */
struct AdapterCtlBlk *acb;
struct list_head srb_going_list; /* head of going srb list */
struct list_head srb_waiting_list; /* head of waiting srb list */
struct ScsiReqBlk *active_srb;
u32 tag_mask;
u16 max_command;
u8 target_id; /* SCSI Target ID (SCSI Only) */
u8 target_lun; /* SCSI Log. Unit (SCSI Only) */
u8 identify_msg;
u8 dev_mode;
u8 inquiry7; /* To store Inquiry flags */
u8 sync_mode; /* 0:async mode */
u8 min_nego_period; /* for nego. */
u8 sync_period; /* for reg. */
u8 sync_offset; /* for reg. and nego.(low nibble) */
u8 flag;
u8 dev_type;
u8 init_tcq_flag;
};
struct AdapterCtlBlk {
struct Scsi_Host *scsi_host;
unsigned long io_port_base;
unsigned long io_port_len;
struct list_head dcb_list; /* head of going dcb list */
struct DeviceCtlBlk *dcb_run_robin;
struct DeviceCtlBlk *active_dcb;
struct list_head srb_free_list; /* head of free srb list */
struct ScsiReqBlk *tmp_srb;
struct timer_list waiting_timer;
struct timer_list selto_timer;
u16 srb_count;
u8 sel_timeout;
unsigned int irq_level;
u8 tag_max_num;
u8 acb_flag;
u8 gmode2;
u8 config;
u8 lun_chk;
u8 scan_devices;
u8 hostid_bit;
u8 dcb_map[DC395x_MAX_SCSI_ID];
struct DeviceCtlBlk *children[DC395x_MAX_SCSI_ID][32];
struct pci_dev *dev;
u8 msg_len;
struct ScsiReqBlk srb_array[DC395x_MAX_SRB_CNT];
struct ScsiReqBlk srb;
struct NvRamType eeprom; /* eeprom settings for this adapter */
};
/*---------------------------------------------------------------------------
Forward declarations
---------------------------------------------------------------------------*/
static void data_out_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void command_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void status_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void msgout_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void msgin_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void data_out_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void data_in_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void command_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void status_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void msgout_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void msgin_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void nop0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void nop1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status);
static void set_basic_config(struct AdapterCtlBlk *acb);
static void cleanup_after_transfer(struct AdapterCtlBlk *acb,
struct ScsiReqBlk *srb);
static void reset_scsi_bus(struct AdapterCtlBlk *acb);
static void data_io_transfer(struct AdapterCtlBlk *acb,
struct ScsiReqBlk *srb, u16 io_dir);
static void disconnect(struct AdapterCtlBlk *acb);
static void reselect(struct AdapterCtlBlk *acb);
static u8 start_scsi(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
struct ScsiReqBlk *srb);
static inline void enable_msgout_abort(struct AdapterCtlBlk *acb,
struct ScsiReqBlk *srb);
static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb,
struct ScsiReqBlk *srb);
static void doing_srb_done(struct AdapterCtlBlk *acb, u8 did_code,
struct scsi_cmnd *cmd, u8 force);
static void scsi_reset_detect(struct AdapterCtlBlk *acb);
static void pci_unmap_srb(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb);
static void pci_unmap_srb_sense(struct AdapterCtlBlk *acb,
struct ScsiReqBlk *srb);
static void srb_done(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
struct ScsiReqBlk *srb);
static void request_sense(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
struct ScsiReqBlk *srb);
static void set_xfer_rate(struct AdapterCtlBlk *acb,
struct DeviceCtlBlk *dcb);
static void waiting_timeout(unsigned long ptr);
/*---------------------------------------------------------------------------
Static Data
---------------------------------------------------------------------------*/
static u16 current_sync_offset = 0;
static void *dc395x_scsi_phase0[] = {
data_out_phase0,/* phase:0 */
data_in_phase0, /* phase:1 */
command_phase0, /* phase:2 */
status_phase0, /* phase:3 */
nop0, /* phase:4 PH_BUS_FREE .. initial phase */
nop0, /* phase:5 PH_BUS_FREE .. initial phase */
msgout_phase0, /* phase:6 */
msgin_phase0, /* phase:7 */
};
static void *dc395x_scsi_phase1[] = {
data_out_phase1,/* phase:0 */
data_in_phase1, /* phase:1 */
command_phase1, /* phase:2 */
status_phase1, /* phase:3 */
nop1, /* phase:4 PH_BUS_FREE .. initial phase */
nop1, /* phase:5 PH_BUS_FREE .. initial phase */
msgout_phase1, /* phase:6 */
msgin_phase1, /* phase:7 */
};
/*
*Fast20: 000 50ns, 20.0 MHz
* 001 75ns, 13.3 MHz
* 010 100ns, 10.0 MHz
* 011 125ns, 8.0 MHz
* 100 150ns, 6.6 MHz
* 101 175ns, 5.7 MHz
* 110 200ns, 5.0 MHz
* 111 250ns, 4.0 MHz
*
*Fast40(LVDS): 000 25ns, 40.0 MHz
* 001 50ns, 20.0 MHz
* 010 75ns, 13.3 MHz
* 011 100ns, 10.0 MHz
* 100 125ns, 8.0 MHz
* 101 150ns, 6.6 MHz
* 110 175ns, 5.7 MHz
* 111 200ns, 5.0 MHz
*/
/*static u8 clock_period[] = {12,19,25,31,37,44,50,62};*/
/* real period:48ns,76ns,100ns,124ns,148ns,176ns,200ns,248ns */
static u8 clock_period[] = { 12, 18, 25, 31, 37, 43, 50, 62 };
static u16 clock_speed[] = { 200, 133, 100, 80, 67, 58, 50, 40 };
/*---------------------------------------------------------------------------
Configuration
---------------------------------------------------------------------------*/
/*
* Module/boot parameters currently effect *all* instances of the
* card in the system.
*/
/*
* Command line parameters are stored in a structure below.
* These are the index's into the structure for the various
* command line options.
*/
#define CFG_ADAPTER_ID 0
#define CFG_MAX_SPEED 1
#define CFG_DEV_MODE 2
#define CFG_ADAPTER_MODE 3
#define CFG_TAGS 4
#define CFG_RESET_DELAY 5
#define CFG_NUM 6 /* number of configuration items */
/*
* Value used to indicate that a command line override
* hasn't been used to modify the value.
*/
#define CFG_PARAM_UNSET -1
/*
* Hold command line parameters.
*/
struct ParameterData {
int value; /* value of this setting */
int min; /* minimum value */
int max; /* maximum value */
int def; /* default value */
int safe; /* safe value */
};
static struct ParameterData __devinitdata cfg_data[] = {
{ /* adapter id */
CFG_PARAM_UNSET,
0,
15,
7,
7
},
{ /* max speed */
CFG_PARAM_UNSET,
0,
7,
1, /* 13.3Mhz */
4, /* 6.7Hmz */
},
{ /* dev mode */
CFG_PARAM_UNSET,
0,
0x3f,
NTC_DO_PARITY_CHK | NTC_DO_DISCONNECT | NTC_DO_SYNC_NEGO |
NTC_DO_WIDE_NEGO | NTC_DO_TAG_QUEUEING |
NTC_DO_SEND_START,
NTC_DO_PARITY_CHK | NTC_DO_SEND_START
},
{ /* adapter mode */
CFG_PARAM_UNSET,
0,
0x2f,
#ifdef CONFIG_SCSI_MULTI_LUN
NAC_SCANLUN |
#endif
NAC_GT2DRIVES | NAC_GREATER_1G | NAC_POWERON_SCSI_RESET
/*| NAC_ACTIVE_NEG*/,
NAC_GT2DRIVES | NAC_GREATER_1G | NAC_POWERON_SCSI_RESET | 0x08
},
{ /* tags */
CFG_PARAM_UNSET,
0,
5,
3, /* 16 tags (??) */
2,
},
{ /* reset delay */
CFG_PARAM_UNSET,
0,
180,
1, /* 1 second */
10, /* 10 seconds */
}
};
/*
* Safe settings. If set to zero the the BIOS/default values with
* command line overrides will be used. If set to 1 then safe and
* slow settings will be used.
*/
static int use_safe_settings = 0;
module_param_named(safe, use_safe_settings, bool, 0);
MODULE_PARM_DESC(safe, "Use safe and slow settings only. Default: false");
module_param_named(adapter_id, cfg_data[CFG_ADAPTER_ID].value, int, 0);
MODULE_PARM_DESC(adapter_id, "Adapter SCSI ID. Default 7 (0-15)");
module_param_named(max_speed, cfg_data[CFG_MAX_SPEED].value, int, 0);
MODULE_PARM_DESC(max_speed, "Maximum bus speed. Default 1 (0-7) Speeds: 0=20, 1=13.3, 2=10, 3=8, 4=6.7, 5=5.8, 6=5, 7=4 Mhz");
module_param_named(dev_mode, cfg_data[CFG_DEV_MODE].value, int, 0);
MODULE_PARM_DESC(dev_mode, "Device mode.");
module_param_named(adapter_mode, cfg_data[CFG_ADAPTER_MODE].value, int, 0);
MODULE_PARM_DESC(adapter_mode, "Adapter mode.");
module_param_named(tags, cfg_data[CFG_TAGS].value, int, 0);
MODULE_PARM_DESC(tags, "Number of tags (1<<x). Default 3 (0-5)");
module_param_named(reset_delay, cfg_data[CFG_RESET_DELAY].value, int, 0);
MODULE_PARM_DESC(reset_delay, "Reset delay in seconds. Default 1 (0-180)");
/**
* set_safe_settings - if the use_safe_settings option is set then
* set all values to the safe and slow values.
**/
static void __devinit set_safe_settings(void)
{
if (use_safe_settings)
{
int i;
dprintkl(KERN_INFO, "Using safe settings.\n");
for (i = 0; i < CFG_NUM; i++)
{
cfg_data[i].value = cfg_data[i].safe;
}
}
}
/**
* fix_settings - reset any boot parameters which are out of range
* back to the default values.
**/
static void __devinit fix_settings(void)
{
int i;
dprintkdbg(DBG_1,
"setup: AdapterId=%08x MaxSpeed=%08x DevMode=%08x "
"AdapterMode=%08x Tags=%08x ResetDelay=%08x\n",
cfg_data[CFG_ADAPTER_ID].value,
cfg_data[CFG_MAX_SPEED].value,
cfg_data[CFG_DEV_MODE].value,
cfg_data[CFG_ADAPTER_MODE].value,
cfg_data[CFG_TAGS].value,
cfg_data[CFG_RESET_DELAY].value);
for (i = 0; i < CFG_NUM; i++)
{
if (cfg_data[i].value < cfg_data[i].min
|| cfg_data[i].value > cfg_data[i].max)
cfg_data[i].value = cfg_data[i].def;
}
}
/*
* Mapping from the eeprom delay index value (index into this array)
* to the the number of actual seconds that the delay should be for.
*/
static char __devinitdata eeprom_index_to_delay_map[] =
{ 1, 3, 5, 10, 16, 30, 60, 120 };
/**
* eeprom_index_to_delay - Take the eeprom delay setting and convert it
* into a number of seconds.
*
* @eeprom: The eeprom structure in which we find the delay index to map.
**/
static void __devinit eeprom_index_to_delay(struct NvRamType *eeprom)
{
eeprom->delay_time = eeprom_index_to_delay_map[eeprom->delay_time];
}
/**
* delay_to_eeprom_index - Take a delay in seconds and return the
* closest eeprom index which will delay for at least that amount of
* seconds.
*
* @delay: The delay, in seconds, to find the eeprom index for.
**/
static int __devinit delay_to_eeprom_index(int delay)
{
u8 idx = 0;
while (idx < 7 && eeprom_index_to_delay_map[idx] < delay)
idx++;
return idx;
}
/**
* eeprom_override - Override the eeprom settings, in the provided
* eeprom structure, with values that have been set on the command
* line.
*
* @eeprom: The eeprom data to override with command line options.
**/
static void __devinit eeprom_override(struct NvRamType *eeprom)
{
u8 id;
/* Adapter Settings */
if (cfg_data[CFG_ADAPTER_ID].value != CFG_PARAM_UNSET)
eeprom->scsi_id = (u8)cfg_data[CFG_ADAPTER_ID].value;
if (cfg_data[CFG_ADAPTER_MODE].value != CFG_PARAM_UNSET)
eeprom->channel_cfg = (u8)cfg_data[CFG_ADAPTER_MODE].value;
if (cfg_data[CFG_RESET_DELAY].value != CFG_PARAM_UNSET)
eeprom->delay_time = delay_to_eeprom_index(
cfg_data[CFG_RESET_DELAY].value);
if (cfg_data[CFG_TAGS].value != CFG_PARAM_UNSET)
eeprom->max_tag = (u8)cfg_data[CFG_TAGS].value;
/* Device Settings */
for (id = 0; id < DC395x_MAX_SCSI_ID; id++) {
if (cfg_data[CFG_DEV_MODE].value != CFG_PARAM_UNSET)
eeprom->target[id].cfg0 =
(u8)cfg_data[CFG_DEV_MODE].value;
if (cfg_data[CFG_MAX_SPEED].value != CFG_PARAM_UNSET)
eeprom->target[id].period =
(u8)cfg_data[CFG_MAX_SPEED].value;
}
}
/*---------------------------------------------------------------------------
---------------------------------------------------------------------------*/
static unsigned int list_size(struct list_head *head)
{
unsigned int count = 0;
struct list_head *pos;
list_for_each(pos, head)
count++;
return count;
}
static struct DeviceCtlBlk *dcb_get_next(struct list_head *head,
struct DeviceCtlBlk *pos)
{
int use_next = 0;
struct DeviceCtlBlk* next = NULL;
struct DeviceCtlBlk* i;
if (list_empty(head))
return NULL;
/* find supplied dcb and then select the next one */
list_for_each_entry(i, head, list)
if (use_next) {
next = i;
break;
} else if (i == pos) {
use_next = 1;
}
/* if no next one take the head one (ie, wraparound) */
if (!next)
list_for_each_entry(i, head, list) {
next = i;
break;
}
return next;
}
static void free_tag(struct DeviceCtlBlk *dcb, struct ScsiReqBlk *srb)
{
if (srb->tag_number < 255) {
dcb->tag_mask &= ~(1 << srb->tag_number); /* free tag mask */
srb->tag_number = 255;
}
}
/* Find cmd in SRB list */
inline static struct ScsiReqBlk *find_cmd(struct scsi_cmnd *cmd,
struct list_head *head)
{
struct ScsiReqBlk *i;
list_for_each_entry(i, head, list)
if (i->cmd == cmd)
return i;
return NULL;
}
static struct ScsiReqBlk *srb_get_free(struct AdapterCtlBlk *acb)
{
struct list_head *head = &acb->srb_free_list;
struct ScsiReqBlk *srb = NULL;
if (!list_empty(head)) {
srb = list_entry(head->next, struct ScsiReqBlk, list);
list_del(head->next);
dprintkdbg(DBG_0, "srb_get_free: srb=%p\n", srb);
}
return srb;
}
static void srb_free_insert(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
{
dprintkdbg(DBG_0, "srb_free_insert: srb=%p\n", srb);
list_add_tail(&srb->list, &acb->srb_free_list);
}
static void srb_waiting_insert(struct DeviceCtlBlk *dcb,
struct ScsiReqBlk *srb)
{
dprintkdbg(DBG_0, "srb_waiting_insert: (pid#%li) <%02i-%i> srb=%p\n",
srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
list_add(&srb->list, &dcb->srb_waiting_list);
}
static void srb_waiting_append(struct DeviceCtlBlk *dcb,
struct ScsiReqBlk *srb)
{
dprintkdbg(DBG_0, "srb_waiting_append: (pid#%li) <%02i-%i> srb=%p\n",
srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
list_add_tail(&srb->list, &dcb->srb_waiting_list);
}
static void srb_going_append(struct DeviceCtlBlk *dcb, struct ScsiReqBlk *srb)
{
dprintkdbg(DBG_0, "srb_going_append: (pid#%li) <%02i-%i> srb=%p\n",
srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
list_add_tail(&srb->list, &dcb->srb_going_list);
}
static void srb_going_remove(struct DeviceCtlBlk *dcb, struct ScsiReqBlk *srb)
{
struct ScsiReqBlk *i;
struct ScsiReqBlk *tmp;
dprintkdbg(DBG_0, "srb_going_remove: (pid#%li) <%02i-%i> srb=%p\n",
srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
list_for_each_entry_safe(i, tmp, &dcb->srb_going_list, list)
if (i == srb) {
list_del(&srb->list);
break;
}
}
static void srb_waiting_remove(struct DeviceCtlBlk *dcb,
struct ScsiReqBlk *srb)
{
struct ScsiReqBlk *i;
struct ScsiReqBlk *tmp;
dprintkdbg(DBG_0, "srb_waiting_remove: (pid#%li) <%02i-%i> srb=%p\n",
srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
list_for_each_entry_safe(i, tmp, &dcb->srb_waiting_list, list)
if (i == srb) {
list_del(&srb->list);
break;
}
}
static void srb_going_to_waiting_move(struct DeviceCtlBlk *dcb,
struct ScsiReqBlk *srb)
{
dprintkdbg(DBG_0,
"srb_going_to_waiting_move: (pid#%li) <%02i-%i> srb=%p\n",
srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
list_move(&srb->list, &dcb->srb_waiting_list);
}
static void srb_waiting_to_going_move(struct DeviceCtlBlk *dcb,
struct ScsiReqBlk *srb)
{
dprintkdbg(DBG_0,
"srb_waiting_to_going_move: (pid#%li) <%02i-%i> srb=%p\n",
srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
list_move(&srb->list, &dcb->srb_going_list);
}
/* Sets the timer to wake us up */
static void waiting_set_timer(struct AdapterCtlBlk *acb, unsigned long to)
{
if (timer_pending(&acb->waiting_timer))
return;
init_timer(&acb->waiting_timer);
acb->waiting_timer.function = waiting_timeout;
acb->waiting_timer.data = (unsigned long) acb;
if (time_before(jiffies + to, acb->scsi_host->last_reset - HZ / 2))
acb->waiting_timer.expires =
acb->scsi_host->last_reset - HZ / 2 + 1;
else
acb->waiting_timer.expires = jiffies + to + 1;
add_timer(&acb->waiting_timer);
}
/* Send the next command from the waiting list to the bus */
static void waiting_process_next(struct AdapterCtlBlk *acb)
{
struct DeviceCtlBlk *start = NULL;
struct DeviceCtlBlk *pos;
struct DeviceCtlBlk *dcb;
struct ScsiReqBlk *srb;
struct list_head *dcb_list_head = &acb->dcb_list;
if (acb->active_dcb
|| (acb->acb_flag & (RESET_DETECT + RESET_DONE + RESET_DEV)))
return;
if (timer_pending(&acb->waiting_timer))
del_timer(&acb->waiting_timer);
if (list_empty(dcb_list_head))
return;
/*
* Find the starting dcb. Need to find it again in the list
* since the list may have changed since we set the ptr to it
*/
list_for_each_entry(dcb, dcb_list_head, list)
if (dcb == acb->dcb_run_robin) {
start = dcb;
break;
}
if (!start) {
/* This can happen! */
start = list_entry(dcb_list_head->next, typeof(*start), list);
acb->dcb_run_robin = start;
}
/*
* Loop over the dcb, but we start somewhere (potentially) in
* the middle of the loop so we need to manully do this.
*/
pos = start;
do {
struct list_head *waiting_list_head = &pos->srb_waiting_list;
/* Make sure, the next another device gets scheduled ... */
acb->dcb_run_robin = dcb_get_next(dcb_list_head,
acb->dcb_run_robin);
if (list_empty(waiting_list_head) ||
pos->max_command <= list_size(&pos->srb_going_list)) {
/* move to next dcb */
pos = dcb_get_next(dcb_list_head, pos);
} else {
srb = list_entry(waiting_list_head->next,
struct ScsiReqBlk, list);
/* Try to send to the bus */
if (!start_scsi(acb, pos, srb))
srb_waiting_to_going_move(pos, srb);
else
waiting_set_timer(acb, HZ/50);
break;
}
} while (pos != start);
}
/* Wake up waiting queue */
static void waiting_timeout(unsigned long ptr)
{
unsigned long flags;
struct AdapterCtlBlk *acb = (struct AdapterCtlBlk *)ptr;
dprintkdbg(DBG_1,
"waiting_timeout: Queue woken up by timer. acb=%p\n", acb);
DC395x_LOCK_IO(acb->scsi_host, flags);
waiting_process_next(acb);
DC395x_UNLOCK_IO(acb->scsi_host, flags);
}
/* Get the DCB for a given ID/LUN combination */
static struct DeviceCtlBlk *find_dcb(struct AdapterCtlBlk *acb, u8 id, u8 lun)
{
return acb->children[id][lun];
}
/* Send SCSI Request Block (srb) to adapter (acb) */
static void send_srb(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
{
struct DeviceCtlBlk *dcb = srb->dcb;
if (dcb->max_command <= list_size(&dcb->srb_going_list) ||
acb->active_dcb ||
(acb->acb_flag & (RESET_DETECT + RESET_DONE + RESET_DEV))) {
srb_waiting_append(dcb, srb);
waiting_process_next(acb);
return;
}
if (!start_scsi(acb, dcb, srb))
srb_going_append(dcb, srb);
else {
srb_waiting_insert(dcb, srb);
waiting_set_timer(acb, HZ / 50);
}
}
/* Prepare SRB for being sent to Device DCB w/ command *cmd */
static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb,
struct ScsiReqBlk *srb)
{
enum dma_data_direction dir = cmd->sc_data_direction;
dprintkdbg(DBG_0, "build_srb: (pid#%li) <%02i-%i>\n",
cmd->pid, dcb->target_id, dcb->target_lun);
srb->dcb = dcb;
srb->cmd = cmd;
srb->sg_count = 0;
srb->total_xfer_length = 0;
srb->sg_bus_addr = 0;
srb->virt_addr = NULL;
srb->sg_index = 0;
srb->adapter_status = 0;
srb->target_status = 0;
srb->msg_count = 0;
srb->status = 0;
srb->flag = 0;
srb->state = 0;
srb->retry_count = 0;
srb->tag_number = TAG_NONE;
srb->scsi_phase = PH_BUS_FREE; /* initial phase */
srb->end_message = 0;
if (dir == PCI_DMA_NONE || !cmd->request_buffer) {
dprintkdbg(DBG_0,
"build_srb: [0] len=%d buf=%p use_sg=%d !MAP=%08x\n",
cmd->bufflen, cmd->request_buffer,
cmd->use_sg, srb->segment_x[0].address);
} else if (cmd->use_sg) {
int i;
u32 reqlen = cmd->request_bufflen;
struct scatterlist *sl = (struct scatterlist *)
cmd->request_buffer;
struct SGentry *sgp = srb->segment_x;
srb->sg_count = pci_map_sg(dcb->acb->dev, sl, cmd->use_sg,
dir);
dprintkdbg(DBG_0,
"build_srb: [n] len=%d buf=%p use_sg=%d segs=%d\n",
reqlen, cmd->request_buffer, cmd->use_sg,
srb->sg_count);
for (i = 0; i < srb->sg_count; i++) {
u32 seglen = (u32)sg_dma_len(sl + i);
sgp[i].address = (u32)sg_dma_address(sl + i);
sgp[i].length = seglen;
srb->total_xfer_length += seglen;
srb->virt_map[i] = kmap(sl[i].page);
}
srb->virt_addr = srb->virt_map[0];
sgp += srb->sg_count - 1;
/*
* adjust last page if too big as it is allocated
* on even page boundaries
*/
if (srb->total_xfer_length > reqlen) {
sgp->length -= (srb->total_xfer_length - reqlen);
srb->total_xfer_length = reqlen;
}
/* Fixup for WIDE padding - make sure length is even */
if (dcb->sync_period & WIDE_SYNC &&
srb->total_xfer_length % 2) {
srb->total_xfer_length++;
sgp->length++;
}
srb->sg_bus_addr = pci_map_single(dcb->acb->dev,
srb->segment_x,
SEGMENTX_LEN,
PCI_DMA_TODEVICE);
dprintkdbg(DBG_SG, "build_srb: [n] map sg %p->%08x(%05x)\n",
srb->segment_x, srb->sg_bus_addr, SEGMENTX_LEN);
} else {
srb->total_xfer_length = cmd->request_bufflen;
srb->sg_count = 1;
srb->segment_x[0].address =
pci_map_single(dcb->acb->dev, cmd->request_buffer,
srb->total_xfer_length, dir);
/* Fixup for WIDE padding - make sure length is even */
if (dcb->sync_period & WIDE_SYNC && srb->total_xfer_length % 2)
srb->total_xfer_length++;
srb->segment_x[0].length = srb->total_xfer_length;
srb->virt_addr = cmd->request_buffer;
dprintkdbg(DBG_0,
"build_srb: [1] len=%d buf=%p use_sg=%d map=%08x\n",
srb->total_xfer_length, cmd->request_buffer,
cmd->use_sg, srb->segment_x[0].address);
}
}
/**
* dc395x_queue_command - queue scsi command passed from the mid
* layer, invoke 'done' on completion
*
* @cmd: pointer to scsi command object
* @done: function pointer to be invoked on completion
*
* Returns 1 if the adapter (host) is busy, else returns 0. One
* reason for an adapter to be busy is that the number
* of outstanding queued commands is already equal to
* struct Scsi_Host::can_queue .
*
* Required: if struct Scsi_Host::can_queue is ever non-zero
* then this function is required.
*
* Locks: struct Scsi_Host::host_lock held on entry (with "irqsave")
* and is expected to be held on return.
*
**/
static int dc395x_queue_command(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
{
struct DeviceCtlBlk *dcb;
struct ScsiReqBlk *srb;
struct AdapterCtlBlk *acb =
(struct AdapterCtlBlk *)cmd->device->host->hostdata;
dprintkdbg(DBG_0, "queue_command: (pid#%li) <%02i-%i> cmnd=0x%02x\n",
cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
/* Assume BAD_TARGET; will be cleared later */
cmd->result = DID_BAD_TARGET << 16;
/* ignore invalid targets */
if (cmd->device->id >= acb->scsi_host->max_id ||
cmd->device->lun >= acb->scsi_host->max_lun ||
cmd->device->lun >31) {
goto complete;
}
/* does the specified lun on the specified device exist */
if (!(acb->dcb_map[cmd->device->id] & (1 << cmd->device->lun))) {
dprintkl(KERN_INFO, "queue_command: Ignore target <%02i-%i>\n",
cmd->device->id, cmd->device->lun);
goto complete;
}
/* do we have a DCB for the device */
dcb = find_dcb(acb, cmd->device->id, cmd->device->lun);
if (!dcb) {
/* should never happen */
dprintkl(KERN_ERR, "queue_command: No such device <%02i-%i>",
cmd->device->id, cmd->device->lun);
goto complete;
}
/* set callback and clear result in the command */
cmd->scsi_done = done;
cmd->result = 0;
srb = srb_get_free(acb);
if (!srb)
{
/*
* Return 1 since we are unable to queue this command at this
* point in time.
*/
dprintkdbg(DBG_0, "queue_command: No free srb's\n");
return 1;
}
build_srb(cmd, dcb, srb);
if (!list_empty(&dcb->srb_waiting_list)) {
/* append to waiting queue */
srb_waiting_append(dcb, srb);
waiting_process_next(acb);
} else {
/* process immediately */
send_srb(acb, srb);
}
dprintkdbg(DBG_1, "queue_command: (pid#%li) done\n", cmd->pid);
return 0;
complete:
/*
* Complete the command immediatey, and then return 0 to
* indicate that we have handled the command. This is usually
* done when the commad is for things like non existent
* devices.
*/
done(cmd);
return 0;
}
/*
* Return the disk geometry for the given SCSI device.
*/
static int dc395x_bios_param(struct scsi_device *sdev,
struct block_device *bdev, sector_t capacity, int *info)
{
#ifdef CONFIG_SCSI_DC395x_TRMS1040_TRADMAP
int heads, sectors, cylinders;
struct AdapterCtlBlk *acb;
int size = capacity;
dprintkdbg(DBG_0, "dc395x_bios_param..............\n");
acb = (struct AdapterCtlBlk *)sdev->host->hostdata;
heads = 64;
sectors = 32;
cylinders = size / (heads * sectors);
if ((acb->gmode2 & NAC_GREATER_1G) && (cylinders > 1024)) {
heads = 255;
sectors = 63;
cylinders = size / (heads * sectors);
}
geom[0] = heads;
geom[1] = sectors;
geom[2] = cylinders;
return 0;
#else
return scsicam_bios_param(bdev, capacity, info);
#endif
}
static void dump_register_info(struct AdapterCtlBlk *acb,
struct DeviceCtlBlk *dcb, struct ScsiReqBlk *srb)
{
u16 pstat;
struct pci_dev *dev = acb->dev;
pci_read_config_word(dev, PCI_STATUS, &pstat);
if (!dcb)
dcb = acb->active_dcb;
if (!srb && dcb)
srb = dcb->active_srb;
if (srb) {
if (!srb->cmd)
dprintkl(KERN_INFO, "dump: srb=%p cmd=%p OOOPS!\n",
srb, srb->cmd);
else
dprintkl(KERN_INFO, "dump: srb=%p cmd=%p (pid#%li) "
"cmnd=0x%02x <%02i-%i>\n",
srb, srb->cmd, srb->cmd->pid,
srb->cmd->cmnd[0], srb->cmd->device->id,
srb->cmd->device->lun);
printk(" sglist=%p cnt=%i idx=%i len=%i\n",
srb->segment_x, srb->sg_count, srb->sg_index,
srb->total_xfer_length);
printk(" state=0x%04x status=0x%02x phase=0x%02x (%sconn.)\n",
srb->state, srb->status, srb->scsi_phase,
(acb->active_dcb) ? "" : "not");
}
dprintkl(KERN_INFO, "dump: SCSI{status=0x%04x fifocnt=0x%02x "
"signals=0x%02x irqstat=0x%02x sync=0x%02x target=0x%02x "
"rselid=0x%02x ctr=0x%08x irqen=0x%02x config=0x%04x "
"config2=0x%02x cmd=0x%02x selto=0x%02x}\n",
DC395x_read16(acb, TRM_S1040_SCSI_STATUS),
DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT),
DC395x_read8(acb, TRM_S1040_SCSI_SIGNAL),
DC395x_read8(acb, TRM_S1040_SCSI_INTSTATUS),
DC395x_read8(acb, TRM_S1040_SCSI_SYNC),
DC395x_read8(acb, TRM_S1040_SCSI_TARGETID),
DC395x_read8(acb, TRM_S1040_SCSI_IDMSG),
DC395x_read32(acb, TRM_S1040_SCSI_COUNTER),
DC395x_read8(acb, TRM_S1040_SCSI_INTEN),
DC395x_read16(acb, TRM_S1040_SCSI_CONFIG0),
DC395x_read8(acb, TRM_S1040_SCSI_CONFIG2),
DC395x_read8(acb, TRM_S1040_SCSI_COMMAND),
DC395x_read8(acb, TRM_S1040_SCSI_TIMEOUT));
dprintkl(KERN_INFO, "dump: DMA{cmd=0x%04x fifocnt=0x%02x fstat=0x%02x "
"irqstat=0x%02x irqen=0x%02x cfg=0x%04x tctr=0x%08x "
"ctctr=0x%08x addr=0x%08x:0x%08x}\n",
DC395x_read16(acb, TRM_S1040_DMA_COMMAND),
DC395x_read8(acb, TRM_S1040_DMA_FIFOCNT),
DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT),
DC395x_read8(acb, TRM_S1040_DMA_STATUS),
DC395x_read8(acb, TRM_S1040_DMA_INTEN),
DC395x_read16(acb, TRM_S1040_DMA_CONFIG),
DC395x_read32(acb, TRM_S1040_DMA_XCNT),
DC395x_read32(acb, TRM_S1040_DMA_CXCNT),
DC395x_read32(acb, TRM_S1040_DMA_XHIGHADDR),
DC395x_read32(acb, TRM_S1040_DMA_XLOWADDR));
dprintkl(KERN_INFO, "dump: gen{gctrl=0x%02x gstat=0x%02x gtmr=0x%02x} "
"pci{status=0x%04x}\n",
DC395x_read8(acb, TRM_S1040_GEN_CONTROL),
DC395x_read8(acb, TRM_S1040_GEN_STATUS),
DC395x_read8(acb, TRM_S1040_GEN_TIMER),
pstat);
}
static inline void clear_fifo(struct AdapterCtlBlk *acb, char *txt)
{
#if debug_enabled(DBG_FIFO)
u8 lines = DC395x_read8(acb, TRM_S1040_SCSI_SIGNAL);
u8 fifocnt = DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT);
if (!(fifocnt & 0x40))
dprintkdbg(DBG_FIFO,
"clear_fifo: (%i bytes) on phase %02x in %s\n",
fifocnt & 0x3f, lines, txt);
#endif
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_CLRFIFO);
}
static void reset_dev_param(struct AdapterCtlBlk *acb)
{
struct DeviceCtlBlk *dcb;
struct NvRamType *eeprom = &acb->eeprom;
dprintkdbg(DBG_0, "reset_dev_param: acb=%p\n", acb);
list_for_each_entry(dcb, &acb->dcb_list, list) {
u8 period_index;
dcb->sync_mode &= ~(SYNC_NEGO_DONE + WIDE_NEGO_DONE);
dcb->sync_period = 0;
dcb->sync_offset = 0;
dcb->dev_mode = eeprom->target[dcb->target_id].cfg0;
period_index = eeprom->target[dcb->target_id].period & 0x07;
dcb->min_nego_period = clock_period[period_index];
if (!(dcb->dev_mode & NTC_DO_WIDE_NEGO)
|| !(acb->config & HCC_WIDE_CARD))
dcb->sync_mode &= ~WIDE_NEGO_ENABLE;
}
}
/*
* perform a hard reset on the SCSI bus
* @cmd - some command for this host (for fetching hooks)
* Returns: SUCCESS (0x2002) on success, else FAILED (0x2003).
*/
static int dc395x_eh_bus_reset(struct scsi_cmnd *cmd)
{
struct AdapterCtlBlk *acb =
(struct AdapterCtlBlk *)cmd->device->host->hostdata;
dprintkl(KERN_INFO,
"eh_bus_reset: (pid#%li) target=<%02i-%i> cmd=%p\n",
cmd->pid, cmd->device->id, cmd->device->lun, cmd);
if (timer_pending(&acb->waiting_timer))
del_timer(&acb->waiting_timer);
/*
* disable interrupt
*/
DC395x_write8(acb, TRM_S1040_DMA_INTEN, 0x00);
DC395x_write8(acb, TRM_S1040_SCSI_INTEN, 0x00);
DC395x_write8(acb, TRM_S1040_SCSI_CONTROL, DO_RSTMODULE);
DC395x_write8(acb, TRM_S1040_DMA_CONTROL, DMARESETMODULE);
reset_scsi_bus(acb);
udelay(500);
/* We may be in serious trouble. Wait some seconds */
acb->scsi_host->last_reset =
jiffies + 3 * HZ / 2 +
HZ * acb->eeprom.delay_time;
/*
* re-enable interrupt
*/
/* Clear SCSI FIFO */
DC395x_write8(acb, TRM_S1040_DMA_CONTROL, CLRXFIFO);
clear_fifo(acb, "eh_bus_reset");
/* Delete pending IRQ */
DC395x_read8(acb, TRM_S1040_SCSI_INTSTATUS);
set_basic_config(acb);
reset_dev_param(acb);
doing_srb_done(acb, DID_RESET, cmd, 0);
acb->active_dcb = NULL;
acb->acb_flag = 0; /* RESET_DETECT, RESET_DONE ,RESET_DEV */
waiting_process_next(acb);
return SUCCESS;
}
/*
* abort an errant SCSI command
* @cmd - command to be aborted
* Returns: SUCCESS (0x2002) on success, else FAILED (0x2003).
*/
static int dc395x_eh_abort(struct scsi_cmnd *cmd)
{
/*
* Look into our command queues: If it has not been sent already,
* we remove it and return success. Otherwise fail.
*/
struct AdapterCtlBlk *acb =
(struct AdapterCtlBlk *)cmd->device->host->hostdata;
struct DeviceCtlBlk *dcb;
struct ScsiReqBlk *srb;
dprintkl(KERN_INFO, "eh_abort: (pid#%li) target=<%02i-%i> cmd=%p\n",
cmd->pid, cmd->device->id, cmd->device->lun, cmd);
dcb = find_dcb(acb, cmd->device->id, cmd->device->lun);
if (!dcb) {
dprintkl(KERN_DEBUG, "eh_abort: No such device\n");
return FAILED;
}
srb = find_cmd(cmd, &dcb->srb_waiting_list);
if (srb) {
srb_waiting_remove(dcb, srb);
pci_unmap_srb_sense(acb, srb);
pci_unmap_srb(acb, srb);
free_tag(dcb, srb);
srb_free_insert(acb, srb);
dprintkl(KERN_DEBUG, "eh_abort: Command was waiting\n");
cmd->result = DID_ABORT << 16;
return SUCCESS;
}
srb = find_cmd(cmd, &dcb->srb_going_list);
if (srb) {
dprintkl(KERN_DEBUG, "eh_abort: Command in progress");
/* XXX: Should abort the command here */
} else {
dprintkl(KERN_DEBUG, "eh_abort: Command not found");
}
return FAILED;
}
/* SDTR */
static void build_sdtr(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
struct ScsiReqBlk *srb)
{
u8 *ptr = srb->msgout_buf + srb->msg_count;
if (srb->msg_count > 1) {
dprintkl(KERN_INFO,
"build_sdtr: msgout_buf BUSY (%i: %02x %02x)\n",
srb->msg_count, srb->msgout_buf[0],
srb->msgout_buf[1]);
return;
}
if (!(dcb->dev_mode & NTC_DO_SYNC_NEGO)) {
dcb->sync_offset = 0;
dcb->min_nego_period = 200 >> 2;
} else if (dcb->sync_offset == 0)
dcb->sync_offset = SYNC_NEGO_OFFSET;
*ptr++ = MSG_EXTENDED; /* (01h) */
*ptr++ = 3; /* length */
*ptr++ = EXTENDED_SDTR; /* (01h) */
*ptr++ = dcb->min_nego_period; /* Transfer period (in 4ns) */
*ptr++ = dcb->sync_offset; /* Transfer period (max. REQ/ACK dist) */
srb->msg_count += 5;
srb->state |= SRB_DO_SYNC_NEGO;
}
/* WDTR */
static void build_wdtr(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
struct ScsiReqBlk *srb)
{
u8 wide = ((dcb->dev_mode & NTC_DO_WIDE_NEGO) &
(acb->config & HCC_WIDE_CARD)) ? 1 : 0;
u8 *ptr = srb->msgout_buf + srb->msg_count;
if (srb->msg_count > 1) {
dprintkl(KERN_INFO,
"build_wdtr: msgout_buf BUSY (%i: %02x %02x)\n",
srb->msg_count, srb->msgout_buf[0],
srb->msgout_buf[1]);
return;
}
*ptr++ = MSG_EXTENDED; /* (01h) */
*ptr++ = 2; /* length */
*ptr++ = EXTENDED_WDTR; /* (03h) */
*ptr++ = wide;
srb->msg_count += 4;
srb->state |= SRB_DO_WIDE_NEGO;
}
#if 0
/* Timer to work around chip flaw: When selecting and the bus is
* busy, we sometimes miss a Selection timeout IRQ */
void selection_timeout_missed(unsigned long ptr);
/* Sets the timer to wake us up */
static void selto_timer(struct AdapterCtlBlk *acb)
{
if (timer_pending(&acb->selto_timer))
return;
acb->selto_timer.function = selection_timeout_missed;
acb->selto_timer.data = (unsigned long) acb;
if (time_before
(jiffies + HZ, acb->scsi_host->last_reset + HZ / 2))
acb->selto_timer.expires =
acb->scsi_host->last_reset + HZ / 2 + 1;
else
acb->selto_timer.expires = jiffies + HZ + 1;
add_timer(&acb->selto_timer);
}
void selection_timeout_missed(unsigned long ptr)
{
unsigned long flags;
struct AdapterCtlBlk *acb = (struct AdapterCtlBlk *)ptr;
struct ScsiReqBlk *srb;
dprintkl(KERN_DEBUG, "Chip forgot to produce SelTO IRQ!\n");
if (!acb->active_dcb || !acb->active_dcb->active_srb) {
dprintkl(KERN_DEBUG, "... but no cmd pending? Oops!\n");
return;
}
DC395x_LOCK_IO(acb->scsi_host, flags);
srb = acb->active_dcb->active_srb;
disconnect(acb);
DC395x_UNLOCK_IO(acb->scsi_host, flags);
}
#endif
static u8 start_scsi(struct AdapterCtlBlk* acb, struct DeviceCtlBlk* dcb,
struct ScsiReqBlk* srb)
{
u16 s_stat2, return_code;
u8 s_stat, scsicommand, i, identify_message;
u8 *ptr;
dprintkdbg(DBG_0, "start_scsi: (pid#%li) <%02i-%i> srb=%p\n",
srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
srb->tag_number = TAG_NONE; /* acb->tag_max_num: had error read in eeprom */
s_stat = DC395x_read8(acb, TRM_S1040_SCSI_SIGNAL);
s_stat2 = 0;
s_stat2 = DC395x_read16(acb, TRM_S1040_SCSI_STATUS);
#if 1
if (s_stat & 0x20 /* s_stat2 & 0x02000 */ ) {
dprintkdbg(DBG_KG, "start_scsi: (pid#%li) BUSY %02x %04x\n",
srb->cmd->pid, s_stat, s_stat2);
/*
* Try anyway?
*
* We could, BUT: Sometimes the TRM_S1040 misses to produce a Selection
* Timeout, a Disconnect or a Reselction IRQ, so we would be screwed!
* (This is likely to be a bug in the hardware. Obviously, most people
* only have one initiator per SCSI bus.)
* Instead let this fail and have the timer make sure the command is
* tried again after a short time
*/
/*selto_timer (acb); */
return 1;
}
#endif
if (acb->active_dcb) {
dprintkl(KERN_DEBUG, "start_scsi: (pid#%li) Attempt to start a"
"command while another command (pid#%li) is active.",
srb->cmd->pid,
acb->active_dcb->active_srb ?
acb->active_dcb->active_srb->cmd->pid : 0);
return 1;
}
if (DC395x_read16(acb, TRM_S1040_SCSI_STATUS) & SCSIINTERRUPT) {
dprintkdbg(DBG_KG, "start_scsi: (pid#%li) Failed (busy)\n",
srb->cmd->pid);
return 1;
}
/* Allow starting of SCSI commands half a second before we allow the mid-level
* to queue them again after a reset */
if (time_before(jiffies, acb->scsi_host->last_reset - HZ / 2)) {
dprintkdbg(DBG_KG, "start_scsi: Refuse cmds (reset wait)\n");
return 1;
}
/* Flush FIFO */
clear_fifo(acb, "start_scsi");
DC395x_write8(acb, TRM_S1040_SCSI_HOSTID, acb->scsi_host->this_id);
DC395x_write8(acb, TRM_S1040_SCSI_TARGETID, dcb->target_id);
DC395x_write8(acb, TRM_S1040_SCSI_SYNC, dcb->sync_period);
DC395x_write8(acb, TRM_S1040_SCSI_OFFSET, dcb->sync_offset);
srb->scsi_phase = PH_BUS_FREE; /* initial phase */
identify_message = dcb->identify_msg;
/*DC395x_TRM_write8(TRM_S1040_SCSI_IDMSG, identify_message); */
/* Don't allow disconnection for AUTO_REQSENSE: Cont.All.Cond.! */
if (srb->flag & AUTO_REQSENSE)
identify_message &= 0xBF;
if (((srb->cmd->cmnd[0] == INQUIRY)
|| (srb->cmd->cmnd[0] == REQUEST_SENSE)
|| (srb->flag & AUTO_REQSENSE))
&& (((dcb->sync_mode & WIDE_NEGO_ENABLE)
&& !(dcb->sync_mode & WIDE_NEGO_DONE))
|| ((dcb->sync_mode & SYNC_NEGO_ENABLE)
&& !(dcb->sync_mode & SYNC_NEGO_DONE)))
&& (dcb->target_lun == 0)) {
srb->msgout_buf[0] = identify_message;
srb->msg_count = 1;
scsicommand = SCMD_SEL_ATNSTOP;
srb->state = SRB_MSGOUT;
#ifndef SYNC_FIRST
if (dcb->sync_mode & WIDE_NEGO_ENABLE
&& dcb->inquiry7 & SCSI_INQ_WBUS16) {
build_wdtr(acb, dcb, srb);
goto no_cmd;
}
#endif
if (dcb->sync_mode & SYNC_NEGO_ENABLE
&& dcb->inquiry7 & SCSI_INQ_SYNC) {
build_sdtr(acb, dcb, srb);
goto no_cmd;
}
if (dcb->sync_mode & WIDE_NEGO_ENABLE
&& dcb->inquiry7 & SCSI_INQ_WBUS16) {
build_wdtr(acb, dcb, srb);
goto no_cmd;
}
srb->msg_count = 0;
}
/* Send identify message */
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, identify_message);
scsicommand = SCMD_SEL_ATN;
srb->state = SRB_START_;
#ifndef DC395x_NO_TAGQ
if ((dcb->sync_mode & EN_TAG_QUEUEING)
&& (identify_message & 0xC0)) {
/* Send Tag message */
u32 tag_mask = 1;
u8 tag_number = 0;
while (tag_mask & dcb->tag_mask
&& tag_number <= dcb->max_command) {
tag_mask = tag_mask << 1;
tag_number++;
}
if (tag_number >= dcb->max_command) {
dprintkl(KERN_WARNING, "start_scsi: (pid#%li) "
"Out of tags target=<%02i-%i>)\n",
srb->cmd->pid, srb->cmd->device->id,
srb->cmd->device->lun);
srb->state = SRB_READY;
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL,
DO_HWRESELECT);
return 1;
}
/* Send Tag id */
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, MSG_SIMPLE_QTAG);
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, tag_number);
dcb->tag_mask |= tag_mask;
srb->tag_number = tag_number;
scsicommand = SCMD_SEL_ATN3;
srb->state = SRB_START_;
}
#endif
/*polling:*/
/* Send CDB ..command block ......... */
dprintkdbg(DBG_KG, "start_scsi: (pid#%li) <%02i-%i> cmnd=0x%02x tag=%i\n",
srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun,
srb->cmd->cmnd[0], srb->tag_number);
if (srb->flag & AUTO_REQSENSE) {
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, REQUEST_SENSE);
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, (dcb->target_lun << 5));
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
DC395x_write8(acb, TRM_S1040_SCSI_FIFO,
sizeof(srb->cmd->sense_buffer));
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
} else {
ptr = (u8 *)srb->cmd->cmnd;
for (i = 0; i < srb->cmd->cmd_len; i++)
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, *ptr++);
}
no_cmd:
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL,
DO_HWRESELECT | DO_DATALATCH);
if (DC395x_read16(acb, TRM_S1040_SCSI_STATUS) & SCSIINTERRUPT) {
/*
* If start_scsi return 1:
* we caught an interrupt (must be reset or reselection ... )
* : Let's process it first!
*/
dprintkdbg(DBG_0, "start_scsi: (pid#%li) <%02i-%i> Failed - busy\n",
srb->cmd->pid, dcb->target_id, dcb->target_lun);
srb->state = SRB_READY;
free_tag(dcb, srb);
srb->msg_count = 0;
return_code = 1;
/* This IRQ should NOT get lost, as we did not acknowledge it */
} else {
/*
* If start_scsi returns 0:
* we know that the SCSI processor is free
*/
srb->scsi_phase = PH_BUS_FREE; /* initial phase */
dcb->active_srb = srb;
acb->active_dcb = dcb;
return_code = 0;
/* it's important for atn stop */
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL,
DO_DATALATCH | DO_HWRESELECT);
/* SCSI command */
DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, scsicommand);
}
return return_code;
}
#define DC395x_ENABLE_MSGOUT \
DC395x_write16 (acb, TRM_S1040_SCSI_CONTROL, DO_SETATN); \
srb->state |= SRB_MSGOUT
/* abort command */
static inline void enable_msgout_abort(struct AdapterCtlBlk *acb,
struct ScsiReqBlk *srb)
{
srb->msgout_buf[0] = ABORT;
srb->msg_count = 1;
DC395x_ENABLE_MSGOUT;
srb->state &= ~SRB_MSGIN;
srb->state |= SRB_MSGOUT;
}
/**
* dc395x_handle_interrupt - Handle an interrupt that has been confirmed to
* have been triggered for this card.
*
* @acb: a pointer to the adpter control block
* @scsi_status: the status return when we checked the card
**/
static void dc395x_handle_interrupt(struct AdapterCtlBlk *acb,
u16 scsi_status)
{
struct DeviceCtlBlk *dcb;
struct ScsiReqBlk *srb;
u16 phase;
u8 scsi_intstatus;
unsigned long flags;
void (*dc395x_statev)(struct AdapterCtlBlk *, struct ScsiReqBlk *,
u16 *);
DC395x_LOCK_IO(acb->scsi_host, flags);
/* This acknowledges the IRQ */
scsi_intstatus = DC395x_read8(acb, TRM_S1040_SCSI_INTSTATUS);
if ((scsi_status & 0x2007) == 0x2002)
dprintkl(KERN_DEBUG,
"COP after COP completed? %04x\n", scsi_status);
if (debug_enabled(DBG_KG)) {
if (scsi_intstatus & INT_SELTIMEOUT)
dprintkdbg(DBG_KG, "handle_interrupt: Selection timeout\n");
}
/*dprintkl(KERN_DEBUG, "handle_interrupt: intstatus = 0x%02x ", scsi_intstatus); */
if (timer_pending(&acb->selto_timer))
del_timer(&acb->selto_timer);
if (scsi_intstatus & (INT_SELTIMEOUT | INT_DISCONNECT)) {
disconnect(acb); /* bus free interrupt */
goto out_unlock;
}
if (scsi_intstatus & INT_RESELECTED) {
reselect(acb);
goto out_unlock;
}
if (scsi_intstatus & INT_SELECT) {
dprintkl(KERN_INFO, "Host does not support target mode!\n");
goto out_unlock;
}
if (scsi_intstatus & INT_SCSIRESET) {
scsi_reset_detect(acb);
goto out_unlock;
}
if (scsi_intstatus & (INT_BUSSERVICE | INT_CMDDONE)) {
dcb = acb->active_dcb;
if (!dcb) {
dprintkl(KERN_DEBUG,
"Oops: BusService (%04x %02x) w/o ActiveDCB!\n",
scsi_status, scsi_intstatus);
goto out_unlock;
}
srb = dcb->active_srb;
if (dcb->flag & ABORT_DEV_) {
dprintkdbg(DBG_0, "MsgOut Abort Device.....\n");
enable_msgout_abort(acb, srb);
}
/* software sequential machine */
phase = (u16)srb->scsi_phase;
/*
* 62037 or 62137
* call dc395x_scsi_phase0[]... "phase entry"
* handle every phase before start transfer
*/
/* data_out_phase0, phase:0 */
/* data_in_phase0, phase:1 */
/* command_phase0, phase:2 */
/* status_phase0, phase:3 */
/* nop0, phase:4 PH_BUS_FREE .. initial phase */
/* nop0, phase:5 PH_BUS_FREE .. initial phase */
/* msgout_phase0, phase:6 */
/* msgin_phase0, phase:7 */
dc395x_statev = dc395x_scsi_phase0[phase];
dc395x_statev(acb, srb, &scsi_status);
/*
* if there were any exception occured scsi_status
* will be modify to bus free phase new scsi_status
* transfer out from ... previous dc395x_statev
*/
srb->scsi_phase = scsi_status & PHASEMASK;
phase = (u16)scsi_status & PHASEMASK;
/*
* call dc395x_scsi_phase1[]... "phase entry" handle
* every phase to do transfer
*/
/* data_out_phase1, phase:0 */
/* data_in_phase1, phase:1 */
/* command_phase1, phase:2 */
/* status_phase1, phase:3 */
/* nop1, phase:4 PH_BUS_FREE .. initial phase */
/* nop1, phase:5 PH_BUS_FREE .. initial phase */
/* msgout_phase1, phase:6 */
/* msgin_phase1, phase:7 */
dc395x_statev = dc395x_scsi_phase1[phase];
dc395x_statev(acb, srb, &scsi_status);
}
out_unlock:
DC395x_UNLOCK_IO(acb->scsi_host, flags);
}
static irqreturn_t dc395x_interrupt(int irq, void *dev_id,
struct pt_regs *regs)
{
struct AdapterCtlBlk *acb = (struct AdapterCtlBlk *)dev_id;
u16 scsi_status;
u8 dma_status;
irqreturn_t handled = IRQ_NONE;
/*
* Check for pending interupt
*/
scsi_status = DC395x_read16(acb, TRM_S1040_SCSI_STATUS);
dma_status = DC395x_read8(acb, TRM_S1040_DMA_STATUS);
if (scsi_status & SCSIINTERRUPT) {
/* interupt pending - let's process it! */
dc395x_handle_interrupt(acb, scsi_status);
handled = IRQ_HANDLED;
}
else if (dma_status & 0x20) {
/* Error from the DMA engine */
dprintkl(KERN_INFO, "Interrupt from DMA engine: 0x%02x!\n", dma_status);
#if 0
dprintkl(KERN_INFO, "This means DMA error! Try to handle ...\n");
if (acb->active_dcb) {
acb->active_dcb-> flag |= ABORT_DEV_;
if (acb->active_dcb->active_srb)
enable_msgout_abort(acb, acb->active_dcb->active_srb);
}
DC395x_write8(acb, TRM_S1040_DMA_CONTROL, ABORTXFER | CLRXFIFO);
#else
dprintkl(KERN_INFO, "Ignoring DMA error (probably a bad thing) ...\n");
acb = NULL;
#endif
handled = IRQ_HANDLED;
}
return handled;
}
static void msgout_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
dprintkdbg(DBG_0, "msgout_phase0: (pid#%li)\n", srb->cmd->pid);
if (srb->state & (SRB_UNEXPECT_RESEL + SRB_ABORT_SENT))
*pscsi_status = PH_BUS_FREE; /*.. initial phase */
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH); /* it's important for atn stop */
srb->state &= ~SRB_MSGOUT;
}
static void msgout_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
u16 i;
u8 *ptr;
dprintkdbg(DBG_0, "msgout_phase1: (pid#%li)\n", srb->cmd->pid);
clear_fifo(acb, "msgout_phase1");
if (!(srb->state & SRB_MSGOUT)) {
srb->state |= SRB_MSGOUT;
dprintkl(KERN_DEBUG,
"msgout_phase1: (pid#%li) Phase unexpected\n",
srb->cmd->pid); /* So what ? */
}
if (!srb->msg_count) {
dprintkdbg(DBG_0, "msgout_phase1: (pid#%li) NOP msg\n",
srb->cmd->pid);
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, MSG_NOP);
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH); /* it's important for atn stop */
DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_FIFO_OUT);
return;
}
ptr = (u8 *)srb->msgout_buf;
for (i = 0; i < srb->msg_count; i++)
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, *ptr++);
srb->msg_count = 0;
if (srb->msgout_buf[0] == MSG_ABORT)
srb->state = SRB_ABORT_SENT;
DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_FIFO_OUT);
}
static void command_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
dprintkdbg(DBG_0, "command_phase0: (pid#%li)\n", srb->cmd->pid);
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);
}
static void command_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
struct DeviceCtlBlk *dcb;
u8 *ptr;
u16 i;
dprintkdbg(DBG_0, "command_phase1: (pid#%li)\n", srb->cmd->pid);
clear_fifo(acb, "command_phase1");
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_CLRATN);
if (!(srb->flag & AUTO_REQSENSE)) {
ptr = (u8 *)srb->cmd->cmnd;
for (i = 0; i < srb->cmd->cmd_len; i++) {
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, *ptr);
ptr++;
}
} else {
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, REQUEST_SENSE);
dcb = acb->active_dcb;
/* target id */
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, (dcb->target_lun << 5));
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
DC395x_write8(acb, TRM_S1040_SCSI_FIFO,
sizeof(srb->cmd->sense_buffer));
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
}
srb->state |= SRB_COMMAND;
/* it's important for atn stop */
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);
/* SCSI command */
DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_FIFO_OUT);
}
/*
* Verify that the remaining space in the hw sg lists is the same as
* the count of remaining bytes in srb->total_xfer_length
*/
static void sg_verify_length(struct ScsiReqBlk *srb)
{
if (debug_enabled(DBG_SG)) {
unsigned len = 0;
unsigned idx = srb->sg_index;
struct SGentry *psge = srb->segment_x + idx;
for (; idx < srb->sg_count; psge++, idx++)
len += psge->length;
if (len != srb->total_xfer_length)
dprintkdbg(DBG_SG,
"Inconsistent SRB S/G lengths (Tot=%i, Count=%i) !!\n",
srb->total_xfer_length, len);
}
}
/*
* Compute the next Scatter Gather list index and adjust its length
* and address if necessary; also compute virt_addr
*/
static void sg_update_list(struct ScsiReqBlk *srb, u32 left)
{
u8 idx;
struct scatterlist *sg;
struct scsi_cmnd *cmd = srb->cmd;
int segment = cmd->use_sg;
u32 xferred = srb->total_xfer_length - left; /* bytes transfered */
struct SGentry *psge = srb->segment_x + srb->sg_index;
void **virt = srb->virt_map;
dprintkdbg(DBG_0,
"sg_update_list: Transfered %i of %i bytes, %i remain\n",
xferred, srb->total_xfer_length, left);
if (xferred == 0) {
/* nothing to update since we did not transfer any data */
return;
}
sg_verify_length(srb);
srb->total_xfer_length = left; /* update remaining count */
for (idx = srb->sg_index; idx < srb->sg_count; idx++) {
if (xferred >= psge->length) {
/* Complete SG entries done */
xferred -= psge->length;
} else {
/* Partial SG entry done */
psge->length -= xferred;
psge->address += xferred;
srb->sg_index = idx;
pci_dma_sync_single_for_device(srb->dcb->
acb->dev,
srb->sg_bus_addr,
SEGMENTX_LEN,
PCI_DMA_TODEVICE);
break;
}
psge++;
}
sg_verify_length(srb);
/* we need the corresponding virtual address */
if (!segment) {
srb->virt_addr += xferred;
return;
}
/* We have to walk the scatterlist to find it */
sg = (struct scatterlist *)cmd->request_buffer;
idx = 0;
while (segment--) {
unsigned long mask =
~((unsigned long)sg->length - 1) & PAGE_MASK;
if ((sg_dma_address(sg) & mask) == (psge->address & mask)) {
srb->virt_addr = virt[idx] + (psge->address & ~PAGE_MASK);
return;
}
++sg;
++idx;
}
dprintkl(KERN_ERR, "sg_update_list: sg_to_virt failed\n");
srb->virt_addr = NULL;
}
/*
* We have transfered a single byte (PIO mode?) and need to update
* the count of bytes remaining (total_xfer_length) and update the sg
* entry to either point to next byte in the current sg entry, or of
* already at the end to point to the start of the next sg entry
*/
static void sg_subtract_one(struct ScsiReqBlk *srb)
{
srb->total_xfer_length--;
srb->segment_x[srb->sg_index].length--;
if (srb->total_xfer_length &&
!srb->segment_x[srb->sg_index].length) {
if (debug_enabled(DBG_PIO))
printk(" (next segment)");
srb->sg_index++;
sg_update_list(srb, srb->total_xfer_length);
}
}
/*
* cleanup_after_transfer
*
* Makes sure, DMA and SCSI engine are empty, after the transfer has finished
* KG: Currently called from StatusPhase1 ()
* Should probably also be called from other places
* Best might be to call it in DataXXPhase0, if new phase will differ
*/
static void cleanup_after_transfer(struct AdapterCtlBlk *acb,
struct ScsiReqBlk *srb)
{
/*DC395x_write8 (TRM_S1040_DMA_STATUS, FORCEDMACOMP); */
if (DC395x_read16(acb, TRM_S1040_DMA_COMMAND) & 0x0001) { /* read */
if (!(DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) & 0x40))
clear_fifo(acb, "cleanup/in");
if (!(DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT) & 0x80))
DC395x_write8(acb, TRM_S1040_DMA_CONTROL, CLRXFIFO);
} else { /* write */
if (!(DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT) & 0x80))
DC395x_write8(acb, TRM_S1040_DMA_CONTROL, CLRXFIFO);
if (!(DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) & 0x40))
clear_fifo(acb, "cleanup/out");
}
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);
}
/*
* Those no of bytes will be transfered w/ PIO through the SCSI FIFO
* Seems to be needed for unknown reasons; could be a hardware bug :-(
*/
#define DC395x_LASTPIO 4
static void data_out_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
struct DeviceCtlBlk *dcb = srb->dcb;
u16 scsi_status = *pscsi_status;
u32 d_left_counter = 0;
dprintkdbg(DBG_0, "data_out_phase0: (pid#%li) <%02i-%i>\n",
srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun);
/*
* KG: We need to drain the buffers before we draw any conclusions!
* This means telling the DMA to push the rest into SCSI, telling
* SCSI to push the rest to the bus.
* However, the device might have been the one to stop us (phase
* change), and the data in transit just needs to be accounted so
* it can be retransmitted.)
*/
/*
* KG: Stop DMA engine pushing more data into the SCSI FIFO
* If we need more data, the DMA SG list will be freshly set up, anyway
*/
dprintkdbg(DBG_PIO, "data_out_phase0: "
"DMA{fifcnt=0x%02x fifostat=0x%02x} "
"SCSI{fifocnt=0x%02x cnt=0x%06x status=0x%04x} total=0x%06x\n",
DC395x_read8(acb, TRM_S1040_DMA_FIFOCNT),
DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT),
DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT),
DC395x_read32(acb, TRM_S1040_SCSI_COUNTER), scsi_status,
srb->total_xfer_length);
DC395x_write8(acb, TRM_S1040_DMA_CONTROL, STOPDMAXFER | CLRXFIFO);
if (!(srb->state & SRB_XFERPAD)) {
if (scsi_status & PARITYERROR)
srb->status |= PARITY_ERROR;
/*
* KG: Right, we can't just rely on the SCSI_COUNTER, because this
* is the no of bytes it got from the DMA engine not the no it
* transferred successfully to the device. (And the difference could
* be as much as the FIFO size, I guess ...)
*/
if (!(scsi_status & SCSIXFERDONE)) {
/*
* when data transfer from DMA FIFO to SCSI FIFO
* if there was some data left in SCSI FIFO
*/
d_left_counter =
(u32)(DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) &
0x1F);
if (dcb->sync_period & WIDE_SYNC)
d_left_counter <<= 1;
dprintkdbg(DBG_KG, "data_out_phase0: FIFO contains %i %s\n"
"SCSI{fifocnt=0x%02x cnt=0x%08x} "
"DMA{fifocnt=0x%04x cnt=0x%02x ctr=0x%08x}\n",
DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT),
(dcb->sync_period & WIDE_SYNC) ? "words" : "bytes",
DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT),
DC395x_read32(acb, TRM_S1040_SCSI_COUNTER),
DC395x_read8(acb, TRM_S1040_DMA_FIFOCNT),
DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT),
DC395x_read32(acb, TRM_S1040_DMA_CXCNT));
}
/*
* calculate all the residue data that not yet transfered
* SCSI transfer counter + left in SCSI FIFO data
*
* .....TRM_S1040_SCSI_COUNTER (24bits)
* The counter always decrement by one for every SCSI byte transfer.
* .....TRM_S1040_SCSI_FIFOCNT ( 5bits)
* The counter is SCSI FIFO offset counter (in units of bytes or! words)
*/
if (srb->total_xfer_length > DC395x_LASTPIO)
d_left_counter +=
DC395x_read32(acb, TRM_S1040_SCSI_COUNTER);
/* Is this a good idea? */
/*clear_fifo(acb, "DOP1"); */
/* KG: What is this supposed to be useful for? WIDE padding stuff? */
if (d_left_counter == 1 && dcb->sync_period & WIDE_SYNC
&& srb->cmd->request_bufflen % 2) {
d_left_counter = 0;
dprintkl(KERN_INFO,
"data_out_phase0: Discard 1 byte (0x%02x)\n",
scsi_status);
}
/*
* KG: Oops again. Same thinko as above: The SCSI might have been
* faster than the DMA engine, so that it ran out of data.
* In that case, we have to do just nothing!
* But: Why the interrupt: No phase change. No XFERCNT_2_ZERO. Or?
*/
/*
* KG: This is nonsense: We have been WRITING data to the bus
* If the SCSI engine has no bytes left, how should the DMA engine?
*/
if (d_left_counter == 0) {
srb->total_xfer_length = 0;
} else {
/*
* if transfer not yet complete
* there were some data residue in SCSI FIFO or
* SCSI transfer counter not empty
*/
long oldxferred =
srb->total_xfer_length - d_left_counter;
const int diff =
(dcb->sync_period & WIDE_SYNC) ? 2 : 1;
sg_update_list(srb, d_left_counter);
/* KG: Most ugly hack! Apparently, this works around a chip bug */
if ((srb->segment_x[srb->sg_index].length ==
diff && srb->cmd->use_sg)
|| ((oldxferred & ~PAGE_MASK) ==
(PAGE_SIZE - diff))
) {
dprintkl(KERN_INFO, "data_out_phase0: "
"Work around chip bug (%i)?\n", diff);
d_left_counter =
srb->total_xfer_length - diff;
sg_update_list(srb, d_left_counter);
/*srb->total_xfer_length -= diff; */
/*srb->virt_addr += diff; */
/*if (srb->cmd->use_sg) */
/* srb->sg_index++; */
}
}
}
if ((*pscsi_status & PHASEMASK) != PH_DATA_OUT) {
cleanup_after_transfer(acb, srb);
}
}
static void data_out_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
dprintkdbg(DBG_0, "data_out_phase1: (pid#%li) <%02i-%i>\n",
srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun);
clear_fifo(acb, "data_out_phase1");
/* do prepare before transfer when data out phase */
data_io_transfer(acb, srb, XFERDATAOUT);
}
static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
u16 scsi_status = *pscsi_status;
u32 d_left_counter = 0;
dprintkdbg(DBG_0, "data_in_phase0: (pid#%li) <%02i-%i>\n",
srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun);
/*
* KG: DataIn is much more tricky than DataOut. When the device is finished
* and switches to another phase, the SCSI engine should be finished too.
* But: There might still be bytes left in its FIFO to be fetched by the DMA
* engine and transferred to memory.
* We should wait for the FIFOs to be emptied by that (is there any way to
* enforce this?) and then stop the DMA engine, because it might think, that
* there are more bytes to follow. Yes, the device might disconnect prior to
* having all bytes transferred!
* Also we should make sure that all data from the DMA engine buffer's really
* made its way to the system memory! Some documentation on this would not
* seem to be a bad idea, actually.
*/
if (!(srb->state & SRB_XFERPAD)) {
if (scsi_status & PARITYERROR) {
dprintkl(KERN_INFO, "data_in_phase0: (pid#%li) "
"Parity Error\n", srb->cmd->pid);
srb->status |= PARITY_ERROR;
}
/*
* KG: We should wait for the DMA FIFO to be empty ...
* but: it would be better to wait first for the SCSI FIFO and then the
* the DMA FIFO to become empty? How do we know, that the device not already
* sent data to the FIFO in a MsgIn phase, eg.?
*/
if (!(DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT) & 0x80)) {
#if 0
int ctr = 6000000;
dprintkl(KERN_DEBUG,
"DIP0: Wait for DMA FIFO to flush ...\n");
/*DC395x_write8 (TRM_S1040_DMA_CONTROL, STOPDMAXFER); */
/*DC395x_write32 (TRM_S1040_SCSI_COUNTER, 7); */
/*DC395x_write8 (TRM_S1040_SCSI_COMMAND, SCMD_DMA_IN); */
while (!
(DC395x_read16(acb, TRM_S1040_DMA_FIFOSTAT) &
0x80) && --ctr);
if (ctr < 6000000 - 1)
dprintkl(KERN_DEBUG
"DIP0: Had to wait for DMA ...\n");
if (!ctr)
dprintkl(KERN_ERR,
"Deadlock in DIP0 waiting for DMA FIFO empty!!\n");
/*DC395x_write32 (TRM_S1040_SCSI_COUNTER, 0); */
#endif
dprintkdbg(DBG_KG, "data_in_phase0: "
"DMA{fifocnt=0x%02x fifostat=0x%02x}\n",
DC395x_read8(acb, TRM_S1040_DMA_FIFOCNT),
DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT));
}
/* Now: Check remainig data: The SCSI counters should tell us ... */
d_left_counter = DC395x_read32(acb, TRM_S1040_SCSI_COUNTER)
+ ((DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) & 0x1f)
<< ((srb->dcb->sync_period & WIDE_SYNC) ? 1 :
0));
dprintkdbg(DBG_KG, "data_in_phase0: "
"SCSI{fifocnt=0x%02x%s ctr=0x%08x} "
"DMA{fifocnt=0x%02x fifostat=0x%02x ctr=0x%08x} "
"Remain{totxfer=%i scsi_fifo+ctr=%i}\n",
DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT),
(srb->dcb->sync_period & WIDE_SYNC) ? "words" : "bytes",
DC395x_read32(acb, TRM_S1040_SCSI_COUNTER),
DC395x_read8(acb, TRM_S1040_DMA_FIFOCNT),
DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT),
DC395x_read32(acb, TRM_S1040_DMA_CXCNT),
srb->total_xfer_length, d_left_counter);
#if DC395x_LASTPIO
/* KG: Less than or equal to 4 bytes can not be transfered via DMA, it seems. */
if (d_left_counter
&& srb->total_xfer_length <= DC395x_LASTPIO) {
/*u32 addr = (srb->segment_x[srb->sg_index].address); */
/*sg_update_list (srb, d_left_counter); */
dprintkdbg(DBG_PIO, "data_in_phase0: PIO (%i %s) to "
"%p for remaining %i bytes:",
DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) & 0x1f,
(srb->dcb->sync_period & WIDE_SYNC) ?
"words" : "bytes",
srb->virt_addr,
srb->total_xfer_length);
if (srb->dcb->sync_period & WIDE_SYNC)
DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2,
CFG2_WIDEFIFO);
while (DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) != 0x40) {
u8 byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
*(srb->virt_addr)++ = byte;
if (debug_enabled(DBG_PIO))
printk(" %02x", byte);
d_left_counter--;
sg_subtract_one(srb);
}
if (srb->dcb->sync_period & WIDE_SYNC) {
#if 1
/* Read the last byte ... */
if (srb->total_xfer_length > 0) {
u8 byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
*(srb->virt_addr)++ = byte;
srb->total_xfer_length--;
if (debug_enabled(DBG_PIO))
printk(" %02x", byte);
}
#endif
DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2, 0);
}
/*printk(" %08x", *(u32*)(bus_to_virt (addr))); */
/*srb->total_xfer_length = 0; */
if (debug_enabled(DBG_PIO))
printk("\n");
}
#endif /* DC395x_LASTPIO */
#if 0
/*
* KG: This was in DATAOUT. Does it also belong here?
* Nobody seems to know what counter and fifo_cnt count exactly ...
*/
if (!(scsi_status & SCSIXFERDONE)) {
/*
* when data transfer from DMA FIFO to SCSI FIFO
* if there was some data left in SCSI FIFO
*/
d_left_counter =
(u32)(DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) &
0x1F);
if (srb->dcb->sync_period & WIDE_SYNC)
d_left_counter <<= 1;
/*
* if WIDE scsi SCSI FIFOCNT unit is word !!!
* so need to *= 2
* KG: Seems to be correct ...
*/
}
#endif
/* KG: This should not be needed any more! */
if (d_left_counter == 0
|| (scsi_status & SCSIXFERCNT_2_ZERO)) {
#if 0
int ctr = 6000000;
u8 TempDMAstatus;
do {
TempDMAstatus =
DC395x_read8(acb, TRM_S1040_DMA_STATUS);
} while (!(TempDMAstatus & DMAXFERCOMP) && --ctr);
if (!ctr)
dprintkl(KERN_ERR,
"Deadlock in DataInPhase0 waiting for DMA!!\n");
srb->total_xfer_length = 0;
#endif
srb->total_xfer_length = d_left_counter;
} else { /* phase changed */
/*
* parsing the case:
* when a transfer not yet complete
* but be disconnected by target
* if transfer not yet complete
* there were some data residue in SCSI FIFO or
* SCSI transfer counter not empty
*/
sg_update_list(srb, d_left_counter);
}
}
/* KG: The target may decide to disconnect: Empty FIFO before! */
if ((*pscsi_status & PHASEMASK) != PH_DATA_IN) {
cleanup_after_transfer(acb, srb);
}
}
static void data_in_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
dprintkdbg(DBG_0, "data_in_phase1: (pid#%li) <%02i-%i>\n",
srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun);
data_io_transfer(acb, srb, XFERDATAIN);
}
static void data_io_transfer(struct AdapterCtlBlk *acb,
struct ScsiReqBlk *srb, u16 io_dir)
{
struct DeviceCtlBlk *dcb = srb->dcb;
u8 bval;
dprintkdbg(DBG_0,
"data_io_transfer: (pid#%li) <%02i-%i> %c len=%i, sg=(%i/%i)\n",
srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun,
((io_dir & DMACMD_DIR) ? 'r' : 'w'),
srb->total_xfer_length, srb->sg_index, srb->sg_count);
if (srb == acb->tmp_srb)
dprintkl(KERN_ERR, "data_io_transfer: Using tmp_srb!\n");
if (srb->sg_index >= srb->sg_count) {
/* can't happen? out of bounds error */
return;
}
if (srb->total_xfer_length > DC395x_LASTPIO) {
u8 dma_status = DC395x_read8(acb, TRM_S1040_DMA_STATUS);
/*
* KG: What should we do: Use SCSI Cmd 0x90/0x92?
* Maybe, even ABORTXFER would be appropriate
*/
if (dma_status & XFERPENDING) {
dprintkl(KERN_DEBUG, "data_io_transfer: Xfer pending! "
"Expect trouble!\n");
dump_register_info(acb, dcb, srb);
DC395x_write8(acb, TRM_S1040_DMA_CONTROL, CLRXFIFO);
}
/* clear_fifo(acb, "IO"); */
/*
* load what physical address of Scatter/Gather list table
* want to be transfer
*/
srb->state |= SRB_DATA_XFER;
DC395x_write32(acb, TRM_S1040_DMA_XHIGHADDR, 0);
if (srb->cmd->use_sg) { /* with S/G */
io_dir |= DMACMD_SG;
DC395x_write32(acb, TRM_S1040_DMA_XLOWADDR,
srb->sg_bus_addr +
sizeof(struct SGentry) *
srb->sg_index);
/* load how many bytes in the sg list table */
DC395x_write32(acb, TRM_S1040_DMA_XCNT,
((u32)(srb->sg_count -
srb->sg_index) << 3));
} else { /* without S/G */
io_dir &= ~DMACMD_SG;
DC395x_write32(acb, TRM_S1040_DMA_XLOWADDR,
srb->segment_x[0].address);
DC395x_write32(acb, TRM_S1040_DMA_XCNT,
srb->segment_x[0].length);
}
/* load total transfer length (24bits) max value 16Mbyte */
DC395x_write32(acb, TRM_S1040_SCSI_COUNTER,
srb->total_xfer_length);
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH); /* it's important for atn stop */
if (io_dir & DMACMD_DIR) { /* read */
DC395x_write8(acb, TRM_S1040_SCSI_COMMAND,
SCMD_DMA_IN);
DC395x_write16(acb, TRM_S1040_DMA_COMMAND, io_dir);
} else {
DC395x_write16(acb, TRM_S1040_DMA_COMMAND, io_dir);
DC395x_write8(acb, TRM_S1040_SCSI_COMMAND,
SCMD_DMA_OUT);
}
}
#if DC395x_LASTPIO
else if (srb->total_xfer_length > 0) { /* The last four bytes: Do PIO */
/*
* load what physical address of Scatter/Gather list table
* want to be transfer
*/
srb->state |= SRB_DATA_XFER;
/* load total transfer length (24bits) max value 16Mbyte */
DC395x_write32(acb, TRM_S1040_SCSI_COUNTER,
srb->total_xfer_length);
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH); /* it's important for atn stop */
if (io_dir & DMACMD_DIR) { /* read */
DC395x_write8(acb, TRM_S1040_SCSI_COMMAND,
SCMD_FIFO_IN);
} else { /* write */
int ln = srb->total_xfer_length;
if (srb->dcb->sync_period & WIDE_SYNC)
DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2,
CFG2_WIDEFIFO);
dprintkdbg(DBG_PIO,
"data_io_transfer: PIO %i bytes from %p:",
srb->total_xfer_length, srb->virt_addr);
while (srb->total_xfer_length) {
if (debug_enabled(DBG_PIO))
printk(" %02x", (unsigned char) *(srb->virt_addr));
DC395x_write8(acb, TRM_S1040_SCSI_FIFO,
*(srb->virt_addr)++);
sg_subtract_one(srb);
}
if (srb->dcb->sync_period & WIDE_SYNC) {
if (ln % 2) {
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
if (debug_enabled(DBG_PIO))
printk(" |00");
}
DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2, 0);
}
/*DC395x_write32(acb, TRM_S1040_SCSI_COUNTER, ln); */
if (debug_enabled(DBG_PIO))
printk("\n");
DC395x_write8(acb, TRM_S1040_SCSI_COMMAND,
SCMD_FIFO_OUT);
}
}
#endif /* DC395x_LASTPIO */
else { /* xfer pad */
u8 data = 0, data2 = 0;
if (srb->sg_count) {
srb->adapter_status = H_OVER_UNDER_RUN;
srb->status |= OVER_RUN;
}
/*
* KG: despite the fact that we are using 16 bits I/O ops
* the SCSI FIFO is only 8 bits according to the docs
* (we can set bit 1 in 0x8f to serialize FIFO access ...)
*/
if (dcb->sync_period & WIDE_SYNC) {
DC395x_write32(acb, TRM_S1040_SCSI_COUNTER, 2);
DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2,
CFG2_WIDEFIFO);
if (io_dir & DMACMD_DIR) {
data = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
data2 = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
} else {
/* Danger, Robinson: If you find KGs
* scattered over the wide disk, the driver
* or chip is to blame :-( */
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 'K');
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 'G');
}
DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2, 0);
} else {
DC395x_write32(acb, TRM_S1040_SCSI_COUNTER, 1);
/* Danger, Robinson: If you find a collection of Ks on your disk
* something broke :-( */
if (io_dir & DMACMD_DIR)
data = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
else
DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 'K');
}
srb->state |= SRB_XFERPAD;
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH); /* it's important for atn stop */
/* SCSI command */
bval = (io_dir & DMACMD_DIR) ? SCMD_FIFO_IN : SCMD_FIFO_OUT;
DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, bval);
}
}
static void status_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
dprintkdbg(DBG_0, "status_phase0: (pid#%li) <%02i-%i>\n",
srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun);
srb->target_status = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
srb->end_message = DC395x_read8(acb, TRM_S1040_SCSI_FIFO); /* get message */
srb->state = SRB_COMPLETED;
*pscsi_status = PH_BUS_FREE; /*.. initial phase */
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH); /* it's important for atn stop */
DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_MSGACCEPT);
}
static void status_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
dprintkdbg(DBG_0, "status_phase1: (pid#%li) <%02i-%i>\n",
srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun);
srb->state = SRB_STATUS;
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH); /* it's important for atn stop */
DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_COMP);
}
/* Check if the message is complete */
static inline u8 msgin_completed(u8 * msgbuf, u32 len)
{
if (*msgbuf == EXTENDED_MESSAGE) {
if (len < 2)
return 0;
if (len < msgbuf[1] + 2)
return 0;
} else if (*msgbuf >= 0x20 && *msgbuf <= 0x2f) /* two byte messages */
if (len < 2)
return 0;
return 1;
}
/* reject_msg */
static inline void msgin_reject(struct AdapterCtlBlk *acb,
struct ScsiReqBlk *srb)
{
srb->msgout_buf[0] = MESSAGE_REJECT;
srb->msg_count = 1;
DC395x_ENABLE_MSGOUT;
srb->state &= ~SRB_MSGIN;
srb->state |= SRB_MSGOUT;
dprintkl(KERN_INFO, "msgin_reject: 0x%02x <%02i-%i>\n",
srb->msgin_buf[0],
srb->dcb->target_id, srb->dcb->target_lun);
}
static struct ScsiReqBlk *msgin_qtag(struct AdapterCtlBlk *acb,
struct DeviceCtlBlk *dcb, u8 tag)
{
struct ScsiReqBlk *srb = NULL;
struct ScsiReqBlk *i;
dprintkdbg(DBG_0, "msgin_qtag: (pid#%li) tag=%i srb=%p\n",
srb->cmd->pid, tag, srb);
if (!(dcb->tag_mask & (1 << tag)))
dprintkl(KERN_DEBUG,
"msgin_qtag: tag_mask=0x%08x does not reserve tag %i!\n",
dcb->tag_mask, tag);
if (list_empty(&dcb->srb_going_list))
goto mingx0;
list_for_each_entry(i, &dcb->srb_going_list, list) {
if (i->tag_number == tag) {
srb = i;
break;
}
}
if (!srb)
goto mingx0;
dprintkdbg(DBG_0, "msgin_qtag: (pid#%li) <%02i-%i>\n",
srb->cmd->pid, srb->dcb->target_id, srb->dcb->target_lun);
if (dcb->flag & ABORT_DEV_) {
/*srb->state = SRB_ABORT_SENT; */
enable_msgout_abort(acb, srb);
}
if (!(srb->state & SRB_DISCONNECT))
goto mingx0;
memcpy(srb->msgin_buf, dcb->active_srb->msgin_buf, acb->msg_len);
srb->state |= dcb->active_srb->state;
srb->state |= SRB_DATA_XFER;
dcb->active_srb = srb;
/* How can we make the DORS happy? */
return srb;
mingx0:
srb = acb->tmp_srb;
srb->state = SRB_UNEXPECT_RESEL;
dcb->active_srb = srb;
srb->msgout_buf[0] = MSG_ABORT_TAG;
srb->msg_count = 1;
DC395x_ENABLE_MSGOUT;
dprintkl(KERN_DEBUG, "msgin_qtag: Unknown tag %i - abort\n", tag);
return srb;
}
static inline void reprogram_regs(struct AdapterCtlBlk *acb,
struct DeviceCtlBlk *dcb)
{
DC395x_write8(acb, TRM_S1040_SCSI_TARGETID, dcb->target_id);
DC395x_write8(acb, TRM_S1040_SCSI_SYNC, dcb->sync_period);
DC395x_write8(acb, TRM_S1040_SCSI_OFFSET, dcb->sync_offset);
set_xfer_rate(acb, dcb);
}
/* set async transfer mode */
static void msgin_set_async(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
{
struct DeviceCtlBlk *dcb = srb->dcb;
dprintkl(KERN_DEBUG, "msgin_set_async: No sync transfers <%02i-%i>\n",
dcb->target_id, dcb->target_lun);
dcb->sync_mode &= ~(SYNC_NEGO_ENABLE);
dcb->sync_mode |= SYNC_NEGO_DONE;
/*dcb->sync_period &= 0; */
dcb->sync_offset = 0;
dcb->min_nego_period = 200 >> 2; /* 200ns <=> 5 MHz */
srb->state &= ~SRB_DO_SYNC_NEGO;
reprogram_regs(acb, dcb);
if ((dcb->sync_mode & WIDE_NEGO_ENABLE)
&& !(dcb->sync_mode & WIDE_NEGO_DONE)) {
build_wdtr(acb, dcb, srb);
DC395x_ENABLE_MSGOUT;
dprintkdbg(DBG_0, "msgin_set_async(rej): Try WDTR anyway\n");
}
}
/* set sync transfer mode */
static void msgin_set_sync(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
{
struct DeviceCtlBlk *dcb = srb->dcb;
u8 bval;
int fact;
dprintkdbg(DBG_1, "msgin_set_sync: <%02i> Sync: %ins "
"(%02i.%01i MHz) Offset %i\n",
dcb->target_id, srb->msgin_buf[3] << 2,
(250 / srb->msgin_buf[3]),
((250 % srb->msgin_buf[3]) * 10) / srb->msgin_buf[3],
srb->msgin_buf[4]);
if (srb->msgin_buf[4] > 15)
srb->msgin_buf[4] = 15;
if (!(dcb->dev_mode & NTC_DO_SYNC_NEGO))
dcb->sync_offset = 0;
else if (dcb->sync_offset == 0)
dcb->sync_offset = srb->msgin_buf[4];
if (srb->msgin_buf[4] > dcb->sync_offset)
srb->msgin_buf[4] = dcb->sync_offset;
else
dcb->sync_offset = srb->msgin_buf[4];
bval = 0;
while (bval < 7 && (srb->msgin_buf[3] > clock_period[bval]
|| dcb->min_nego_period >
clock_period[bval]))
bval++;
if (srb->msgin_buf[3] < clock_period[bval])
dprintkl(KERN_INFO,
"msgin_set_sync: Increase sync nego period to %ins\n",
clock_period[bval] << 2);
srb->msgin_buf[3] = clock_period[bval];
dcb->sync_period &= 0xf0;
dcb->sync_period |= ALT_SYNC | bval;
dcb->min_nego_period = srb->msgin_buf[3];
if (dcb->sync_period & WIDE_SYNC)
fact = 500;
else
fact = 250;
dprintkl(KERN_INFO,
"Target %02i: %s Sync: %ins Offset %i (%02i.%01i MB/s)\n",
dcb->target_id, (fact == 500) ? "Wide16" : "",
dcb->min_nego_period << 2, dcb->sync_offset,
(fact / dcb->min_nego_period),
((fact % dcb->min_nego_period) * 10 +
dcb->min_nego_period / 2) / dcb->min_nego_period);
if (!(srb->state & SRB_DO_SYNC_NEGO)) {
/* Reply with corrected SDTR Message */
dprintkl(KERN_DEBUG, "msgin_set_sync: answer w/%ins %i\n",
srb->msgin_buf[3] << 2, srb->msgin_buf[4]);
memcpy(srb->msgout_buf, srb->msgin_buf, 5);
srb->msg_count = 5;
DC395x_ENABLE_MSGOUT;
dcb->sync_mode |= SYNC_NEGO_DONE;
} else {
if ((dcb->sync_mode & WIDE_NEGO_ENABLE)
&& !(dcb->sync_mode & WIDE_NEGO_DONE)) {
build_wdtr(acb, dcb, srb);
DC395x_ENABLE_MSGOUT;
dprintkdbg(DBG_0, "msgin_set_sync: Also try WDTR\n");
}
}
srb->state &= ~SRB_DO_SYNC_NEGO;
dcb->sync_mode |= SYNC_NEGO_DONE | SYNC_NEGO_ENABLE;
reprogram_regs(acb, dcb);
}
static inline void msgin_set_nowide(struct AdapterCtlBlk *acb,
struct ScsiReqBlk *srb)
{
struct DeviceCtlBlk *dcb = srb->dcb;
dprintkdbg(DBG_1, "msgin_set_nowide: <%02i>\n", dcb->target_id);
dcb->sync_period &= ~WIDE_SYNC;
dcb->sync_mode &= ~(WIDE_NEGO_ENABLE);
dcb->sync_mode |= WIDE_NEGO_DONE;
srb->state &= ~SRB_DO_WIDE_NEGO;
reprogram_regs(acb, dcb);
if ((dcb->sync_mode & SYNC_NEGO_ENABLE)
&& !(dcb->sync_mode & SYNC_NEGO_DONE)) {
build_sdtr(acb, dcb, srb);
DC395x_ENABLE_MSGOUT;
dprintkdbg(DBG_0, "msgin_set_nowide: Rejected. Try SDTR anyway\n");
}
}
static void msgin_set_wide(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
{
struct DeviceCtlBlk *dcb = srb->dcb;
u8 wide = (dcb->dev_mode & NTC_DO_WIDE_NEGO
&& acb->config & HCC_WIDE_CARD) ? 1 : 0;
dprintkdbg(DBG_1, "msgin_set_wide: <%02i>\n", dcb->target_id);
if (srb->msgin_buf[3] > wide)
srb->msgin_buf[3] = wide;
/* Completed */
if (!(srb->state & SRB_DO_WIDE_NEGO)) {
dprintkl(KERN_DEBUG,
"msgin_set_wide: Wide nego initiated <%02i>\n",
dcb->target_id);
memcpy(srb->msgout_buf, srb->msgin_buf, 4);
srb->msg_count = 4;
srb->state |= SRB_DO_WIDE_NEGO;
DC395x_ENABLE_MSGOUT;
}
dcb->sync_mode |= (WIDE_NEGO_ENABLE | WIDE_NEGO_DONE);
if (srb->msgin_buf[3] > 0)
dcb->sync_period |= WIDE_SYNC;
else
dcb->sync_period &= ~WIDE_SYNC;
srb->state &= ~SRB_DO_WIDE_NEGO;
/*dcb->sync_mode &= ~(WIDE_NEGO_ENABLE+WIDE_NEGO_DONE); */
dprintkdbg(DBG_1,
"msgin_set_wide: Wide (%i bit) negotiated <%02i>\n",
(8 << srb->msgin_buf[3]), dcb->target_id);
reprogram_regs(acb, dcb);
if ((dcb->sync_mode & SYNC_NEGO_ENABLE)
&& !(dcb->sync_mode & SYNC_NEGO_DONE)) {
build_sdtr(acb, dcb, srb);
DC395x_ENABLE_MSGOUT;
dprintkdbg(DBG_0, "msgin_set_wide: Also try SDTR.\n");
}
}
/*
* extended message codes:
*
* code description
*
* 02h Reserved
* 00h MODIFY DATA POINTER
* 01h SYNCHRONOUS DATA TRANSFER REQUEST
* 03h WIDE DATA TRANSFER REQUEST
* 04h - 7Fh Reserved
* 80h - FFh Vendor specific
*/
static void msgin_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
struct DeviceCtlBlk *dcb = acb->active_dcb;
dprintkdbg(DBG_0, "msgin_phase0: (pid#%li)\n", srb->cmd->pid);
srb->msgin_buf[acb->msg_len++] = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
if (msgin_completed(srb->msgin_buf, acb->msg_len)) {
/* Now eval the msg */
switch (srb->msgin_buf[0]) {
case DISCONNECT:
srb->state = SRB_DISCONNECT;
break;
case SIMPLE_QUEUE_TAG:
case HEAD_OF_QUEUE_TAG:
case ORDERED_QUEUE_TAG:
srb =
msgin_qtag(acb, dcb,
srb->msgin_buf[1]);
break;
case MESSAGE_REJECT:
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL,
DO_CLRATN | DO_DATALATCH);
/* A sync nego message was rejected ! */
if (srb->state & SRB_DO_SYNC_NEGO) {
msgin_set_async(acb, srb);
break;
}
/* A wide nego message was rejected ! */
if (srb->state & SRB_DO_WIDE_NEGO) {
msgin_set_nowide(acb, srb);
break;
}
enable_msgout_abort(acb, srb);
/*srb->state |= SRB_ABORT_SENT */
break;
case EXTENDED_MESSAGE:
/* SDTR */
if (srb->msgin_buf[1] == 3
&& srb->msgin_buf[2] == EXTENDED_SDTR) {
msgin_set_sync(acb, srb);
break;
}
/* WDTR */
if (srb->msgin_buf[1] == 2
&& srb->msgin_buf[2] == EXTENDED_WDTR
&& srb->msgin_buf[3] <= 2) { /* sanity check ... */
msgin_set_wide(acb, srb);
break;
}
msgin_reject(acb, srb);
break;
case MSG_IGNOREWIDE:
/* Discard wide residual */
dprintkdbg(DBG_0, "msgin_phase0: Ignore Wide Residual!\n");
break;
case COMMAND_COMPLETE:
/* nothing has to be done */
break;
case SAVE_POINTERS:
/*
* SAVE POINTER may be ignored as we have the struct
* ScsiReqBlk* associated with the scsi command.
*/
dprintkdbg(DBG_0, "msgin_phase0: (pid#%li) "
"SAVE POINTER rem=%i Ignore\n",
srb->cmd->pid, srb->total_xfer_length);
break;
case RESTORE_POINTERS:
dprintkdbg(DBG_0, "msgin_phase0: RESTORE POINTER. Ignore\n");
break;
case ABORT:
dprintkdbg(DBG_0, "msgin_phase0: (pid#%li) "
"<%02i-%i> ABORT msg\n",
srb->cmd->pid, dcb->target_id,
dcb->target_lun);
dcb->flag |= ABORT_DEV_;
enable_msgout_abort(acb, srb);
break;
default:
/* reject unknown messages */
if (srb->msgin_buf[0] & IDENTIFY_BASE) {
dprintkdbg(DBG_0, "msgin_phase0: Identify msg\n");
srb->msg_count = 1;
srb->msgout_buf[0] = dcb->identify_msg;
DC395x_ENABLE_MSGOUT;
srb->state |= SRB_MSGOUT;
/*break; */
}
msgin_reject(acb, srb);
}
/* Clear counter and MsgIn state */
srb->state &= ~SRB_MSGIN;
acb->msg_len = 0;
}
*pscsi_status = PH_BUS_FREE;
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH); /* it's important ... you know! */
DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_MSGACCEPT);
}
static void msgin_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
dprintkdbg(DBG_0, "msgin_phase1: (pid#%li)\n", srb->cmd->pid);
clear_fifo(acb, "msgin_phase1");
DC395x_write32(acb, TRM_S1040_SCSI_COUNTER, 1);
if (!(srb->state & SRB_MSGIN)) {
srb->state &= ~SRB_DISCONNECT;
srb->state |= SRB_MSGIN;
}
DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH); /* it's important for atn stop */
/* SCSI command */
DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_FIFO_IN);
}
static void nop0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
}
static void nop1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
u16 *pscsi_status)
{
}
static void set_xfer_rate(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb)
{
struct DeviceCtlBlk *i;
/* set all lun device's period, offset */