Release 4.11 drivers/scsi/initio.c

/**************************************************************************
 * Initio 9100 device driver for Linux.
 *
 * Copyright (c) 1994-1998 Initio Corporation
 * Copyright (c) 1998 Bas Vermeulen <bvermeul@blackstar.xs4all.nl>
 * Copyright (c) 2004 Christoph Hellwig <hch@lst.de>
 * Copyright (c) 2007 Red Hat
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *************************************************************************
 *
 * DESCRIPTION:
 *
 * This is the Linux low-level SCSI driver for Initio INI-9X00U/UW SCSI host
 * adapters
 *
 * 08/06/97 hc  - v1.01h
 *              - Support inic-940 and inic-935
 * 09/26/97 hc  - v1.01i
 *              - Make correction from J.W. Schultz suggestion
 * 10/13/97 hc  - Support reset function
 * 10/21/97 hc  - v1.01j
 *              - Support 32 LUN (SCSI 3)
 * 01/14/98 hc  - v1.01k
 *              - Fix memory allocation problem
 * 03/04/98 hc  - v1.01l
 *              - Fix tape rewind which will hang the system problem
 *              - Set can_queue to initio_num_scb
 * 06/25/98 hc  - v1.01m
 *              - Get it work for kernel version >= 2.1.75
 *              - Dynamic assign SCSI bus reset holding time in initio_init()
 * 07/02/98 hc  - v1.01n
 *              - Support 0002134A
 * 08/07/98 hc  - v1.01o
 *              - Change the initio_abort_srb routine to use scsi_done. <01>
 * 09/07/98 hl  - v1.02
 *              - Change the INI9100U define and proc_dir_entry to
 *                reflect the newer Kernel 2.1.118, but the v1.o1o
 *                should work with Kernel 2.1.118.
 * 09/20/98 wh  - v1.02a
 *              - Support Abort command.
 *              - Handle reset routine.
 * 09/21/98 hl  - v1.03
 *              - remove comments.
 * 12/09/98 bv  - v1.03a
 *              - Removed unused code
 * 12/13/98 bv  - v1.03b
 *              - Remove cli() locking for kernels >= 2.1.95. This uses
 *                spinlocks to serialize access to the pSRB_head and
 *                pSRB_tail members of the HCS structure.
 * 09/01/99 bv  - v1.03d
 *              - Fixed a deadlock problem in SMP.
 * 21/01/99 bv  - v1.03e
 *              - Add support for the Domex 3192U PCI SCSI
 *                This is a slightly modified patch by
 *                Brian Macy <bmacy@sunshinecomputing.com>
 * 22/02/99 bv  - v1.03f
 *              - Didn't detect the INIC-950 in 2.0.x correctly.
 *                Now fixed.
 * 05/07/99 bv  - v1.03g
 *              - Changed the assumption that HZ = 100
 * 10/17/03 mc  - v1.04
 *              - added new DMA API support
 * 06/01/04 jmd - v1.04a
 *              - Re-add reset_bus support
 **************************************************************************/

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <linux/stat.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/dma-mapping.h>
#include <asm/io.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>

#include "initio.h"


#define SENSE_SIZE		14


#define i91u_MAXQUEUE		2

#define i91u_REVID "Initio INI-9X00U/UW SCSI device driver; Revision: 1.04a"

#ifdef DEBUG_i91u

static unsigned int i91u_debug = DEBUG_DEFAULT;
#endif


static int initio_tag_enable = 1;

#ifdef DEBUG_i91u

static int setup_debug = 0;
#endif

static void i91uSCBPost(u8 * pHcb, u8 * pScb);


#define DEBUG_INTERRUPT 0

#define DEBUG_QUEUE     0

#define DEBUG_STATE     0

#define INT_DISC	0

/*--- forward references ---*/
static struct scsi_ctrl_blk *initio_find_busy_scb(struct initio_host * host, u16 tarlun);
static struct scsi_ctrl_blk *initio_find_done_scb(struct initio_host * host);

static int tulip_main(struct initio_host * host);

static int initio_next_state(struct initio_host * host);
static int initio_state_1(struct initio_host * host);
static int initio_state_2(struct initio_host * host);
static int initio_state_3(struct initio_host * host);
static int initio_state_4(struct initio_host * host);
static int initio_state_5(struct initio_host * host);
static int initio_state_6(struct initio_host * host);
static int initio_state_7(struct initio_host * host);
static int initio_xfer_data_in(struct initio_host * host);
static int initio_xfer_data_out(struct initio_host * host);
static int initio_xpad_in(struct initio_host * host);
static int initio_xpad_out(struct initio_host * host);
static int initio_status_msg(struct initio_host * host);

static int initio_msgin(struct initio_host * host);
static int initio_msgin_sync(struct initio_host * host);
static int initio_msgin_accept(struct initio_host * host);
static int initio_msgout_reject(struct initio_host * host);
static int initio_msgin_extend(struct initio_host * host);

static int initio_msgout_ide(struct initio_host * host);
static int initio_msgout_abort_targ(struct initio_host * host);
static int initio_msgout_abort_tag(struct initio_host * host);

static int initio_bus_device_reset(struct initio_host * host);
static void initio_select_atn(struct initio_host * host, struct scsi_ctrl_blk * scb);
static void initio_select_atn3(struct initio_host * host, struct scsi_ctrl_blk * scb);
static void initio_select_atn_stop(struct initio_host * host, struct scsi_ctrl_blk * scb);
static int int_initio_busfree(struct initio_host * host);
static int int_initio_scsi_rst(struct initio_host * host);
static int int_initio_bad_seq(struct initio_host * host);
static int int_initio_resel(struct initio_host * host);
static int initio_sync_done(struct initio_host * host);
static int wdtr_done(struct initio_host * host);
static int wait_tulip(struct initio_host * host);
static int initio_wait_done_disc(struct initio_host * host);
static int initio_wait_disc(struct initio_host * host);
static void tulip_scsi(struct initio_host * host);
static int initio_post_scsi_rst(struct initio_host * host);

static void initio_se2_ew_en(unsigned long base);
static void initio_se2_ew_ds(unsigned long base);
static int initio_se2_rd_all(unsigned long base);
static void initio_se2_update_all(unsigned long base);	/* setup default pattern */
static void initio_read_eeprom(unsigned long base);

/* ---- INTERNAL VARIABLES ---- */


static NVRAM i91unvram;

static NVRAM *i91unvramp;


static u8 i91udftNvRam[64] =
{
	/*----------- header -----------*/
	0x25, 0xc9,		/* Signature    */
	0x40,			/* Size         */
	0x01,			/* Revision     */
	/* -- Host Adapter Structure -- */
	0x95,			/* ModelByte0   */
	0x00,			/* ModelByte1   */
	0x00,			/* ModelInfo    */
	0x01,			/* NumOfCh      */
	NBC1_DEFAULT,		/* BIOSConfig1  */
	0,			/* BIOSConfig2  */
	0,			/* HAConfig1    */
	0,			/* HAConfig2    */
	/* SCSI channel 0 and target Structure  */
	7,			/* SCSIid       */
	NCC1_DEFAULT,		/* SCSIconfig1  */
	0,			/* SCSIconfig2  */
	0x10,			/* NumSCSItarget */

	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,

	/* SCSI channel 1 and target Structure  */
	7,			/* SCSIid       */
	NCC1_DEFAULT,		/* SCSIconfig1  */
	0,			/* SCSIconfig2  */
	0x10,			/* NumSCSItarget */

	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0};			/*      - CheckSum -            */



static u8 initio_rate_tbl[8] =	/* fast 20      */
{
				/* nanosecond divide by 4 */
	12,			/* 50ns,  20M   */
	18,			/* 75ns,  13.3M */
	25,			/* 100ns, 10M   */
	31,			/* 125ns, 8M    */
	37,			/* 150ns, 6.6M  */
	43,			/* 175ns, 5.7M  */
	50,			/* 200ns, 5M    */
	62			/* 250ns, 4M    */
};



static void initio_do_pause(unsigned amount)
{
	/* Pause for amount jiffies */
	unsigned long the_time = jiffies + amount;

	while (time_before_eq(jiffies, the_time))
		cpu_relax();
}

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/*-- forward reference --*/

/******************************************************************
 Input: instruction for  Serial E2PROM

 EX: se2_rd(0 call se2_instr() to send address and read command

         StartBit  OP_Code   Address                Data
         --------- --------  ------------------     -------
         1         1 , 0     A5,A4,A3,A2,A1,A0      D15-D0

                 +-----------------------------------------------------
                 |
 CS -----+
                        +--+  +--+  +--+  +--+  +--+
                        ^  |  ^  |  ^  |  ^  |  ^  |
                        |  |  |  |  |  |  |  |  |  |
 CLK -------+  +--+  +--+  +--+  +--+  +--
 (leading edge trigger)

                 +--1-----1--+
                 | SB    OP  |  OP    A5    A4
 DI  ----+           +--0------------------
 (address and cmd sent to nvram)

         -------------------------------------------+
                                                                                                |
 DO                                             +---
 (data sent from nvram)


******************************************************************/

/**
 *      initio_se2_instr        -       bitbang an instruction
 *      @base: Base of InitIO controller
 *      @instr: Instruction for serial E2PROM
 *
 *      Bitbang an instruction out to the serial E2Prom
 */



static void initio_se2_instr(unsigned long base, u8 instr)
{
	int i;
	u8 b;

	outb(SE2CS | SE2DO, base + TUL_NVRAM);		/* cs+start bit */
	udelay(30);
	outb(SE2CS | SE2CLK | SE2DO, base + TUL_NVRAM);	/* +CLK */
	udelay(30);

	for (i = 0; i < 8; i++) {
		if (instr & 0x80)
			b = SE2CS | SE2DO;		/* -CLK+dataBit */
		else
			b = SE2CS;			/* -CLK */
		outb(b, base + TUL_NVRAM);
		udelay(30);
		outb(b | SE2CLK, base + TUL_NVRAM);	/* +CLK */
		udelay(30);
		instr <<= 1;
	}
	outb(SE2CS, base + TUL_NVRAM);			/* -CLK */
	udelay(30);
}


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/**
 *      initio_se2_ew_en        -       Enable erase/write
 *      @base: Base address of InitIO controller
 *
 *      Enable erase/write state of serial EEPROM
 */


void initio_se2_ew_en(unsigned long base)
{
	initio_se2_instr(base, 0x30);	/* EWEN */
	outb(0, base + TUL_NVRAM);	/* -CS  */
	udelay(30);
}


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/**
 *      initio_se2_ew_ds        -       Disable erase/write
 *      @base: Base address of InitIO controller
 *
 *      Disable erase/write state of serial EEPROM
 */


void initio_se2_ew_ds(unsigned long base)
{
	initio_se2_instr(base, 0);	/* EWDS */
	outb(0, base + TUL_NVRAM);	/* -CS  */
	udelay(30);
}


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/**
 *      initio_se2_rd           -       read E2PROM word
 *      @base: Base of InitIO controller
 *      @addr: Address of word in E2PROM
 *
 *      Read a word from the NV E2PROM device
 */


static u16 initio_se2_rd(unsigned long base, u8 addr)
{
	u8 instr, rb;
	u16 val = 0;
	int i;

	instr = (u8) (addr | 0x80);
	initio_se2_instr(base, instr);	/* READ INSTR */

	for (i = 15; i >= 0; i--) {
		outb(SE2CS | SE2CLK, base + TUL_NVRAM);	/* +CLK */
		udelay(30);
		outb(SE2CS, base + TUL_NVRAM);		/* -CLK */

		/* sample data after the following edge of clock  */
		rb = inb(base + TUL_NVRAM);
		rb &= SE2DI;
		val += (rb << i);
		udelay(30);	/* 6/20/95 */
	}

	outb(0, base + TUL_NVRAM);		/* no chip select */
	udelay(30);
	return val;
}

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/**
 *      initio_se2_wr           -       read E2PROM word
 *      @base: Base of InitIO controller
 *      @addr: Address of word in E2PROM
 *      @val: Value to write
 *
 *      Write a word to the NV E2PROM device. Used when recovering from
 *      a problem with the NV.
 */


static void initio_se2_wr(unsigned long base, u8 addr, u16 val)
{
	u8 rb;
	u8 instr;
	int i;

	instr = (u8) (addr | 0x40);
	initio_se2_instr(base, instr);	/* WRITE INSTR */
	for (i = 15; i >= 0; i--) {
		if (val & 0x8000)
			outb(SE2CS | SE2DO, base + TUL_NVRAM);	/* -CLK+dataBit 1 */
		else
			outb(SE2CS, base + TUL_NVRAM);		/* -CLK+dataBit 0 */
		udelay(30);
		outb(SE2CS | SE2CLK, base + TUL_NVRAM);		/* +CLK */
		udelay(30);
		val <<= 1;
	}
	outb(SE2CS, base + TUL_NVRAM);				/* -CLK */
	udelay(30);
	outb(0, base + TUL_NVRAM);				/* -CS  */
	udelay(30);

	outb(SE2CS, base + TUL_NVRAM);				/* +CS  */
	udelay(30);

	for (;;) {
		outb(SE2CS | SE2CLK, base + TUL_NVRAM);		/* +CLK */
		udelay(30);
		outb(SE2CS, base + TUL_NVRAM);			/* -CLK */
		udelay(30);
		if ((rb = inb(base + TUL_NVRAM)) & SE2DI)
			break;	/* write complete */
	}
	outb(0, base + TUL_NVRAM);				/* -CS */
}

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/**
 *      initio_se2_rd_all       -       read hostadapter NV configuration
 *      @base: Base address of InitIO controller
 *
 *      Reads the E2PROM data into main memory. Ensures that the checksum
 *      and header marker are valid. Returns 1 on success -1 on error.
 */



static int initio_se2_rd_all(unsigned long base)
{
	int i;
	u16 chksum = 0;
	u16 *np;

	i91unvramp = &i91unvram;
	np = (u16 *) i91unvramp;
	for (i = 0; i < 32; i++)
		*np++ = initio_se2_rd(base, i);

	/* Is signature "ini" ok ? */
	if (i91unvramp->NVM_Signature != INI_SIGNATURE)
		return -1;
	/* Is ckecksum ok ? */
	np = (u16 *) i91unvramp;
	for (i = 0; i < 31; i++)
		chksum += *np++;
	if (i91unvramp->NVM_CheckSum != chksum)
		return -1;
	return 1;
}

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/**
 *      initio_se2_update_all           -       Update E2PROM
 *      @base: Base of InitIO controller
 *
 *      Update the E2PROM by wrting any changes into the E2PROM
 *      chip, rewriting the checksum.
 */


static void initio_se2_update_all(unsigned long base)
{				/* setup default pattern */
	int i;
	u16 chksum = 0;
	u16 *np, *np1;

	i91unvramp = &i91unvram;
	/* Calculate checksum first */
	np = (u16 *) i91udftNvRam;
	for (i = 0; i < 31; i++)
		chksum += *np++;
	*np = chksum;
	initio_se2_ew_en(base);	/* Enable write  */

	np = (u16 *) i91udftNvRam;
	np1 = (u16 *) i91unvramp;
	for (i = 0; i < 32; i++, np++, np1++) {
		if (*np != *np1)
			initio_se2_wr(base, i, *np);
	}
	initio_se2_ew_ds(base);	/* Disable write   */
}

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/**
 *      initio_read_eeprom              -       Retrieve configuration
 *      @base: Base of InitIO Host Adapter
 *
 *      Retrieve the host adapter configuration data from E2Prom. If the
 *      data is invalid then the defaults are used and are also restored
 *      into the E2PROM. This forms the access point for the SCSI driver
 *      into the E2PROM layer, the other functions for the E2PROM are all
 *      internal use.
 *
 *      Must be called single threaded, uses a shared global area.
 */



static void initio_read_eeprom(unsigned long base)
{
	u8 gctrl;

	i91unvramp = &i91unvram;
	/* Enable EEProm programming */
	gctrl = inb(base + TUL_GCTRL);
	outb(gctrl | TUL_GCTRL_EEPROM_BIT, base + TUL_GCTRL);
	if (initio_se2_rd_all(base) != 1) {
		initio_se2_update_all(base);	/* setup default pattern */
		initio_se2_rd_all(base);	/* load again  */
	}
	/* Disable EEProm programming */
	gctrl = inb(base + TUL_GCTRL);
	outb(gctrl & ~TUL_GCTRL_EEPROM_BIT, base + TUL_GCTRL);
}

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/**
 *      initio_stop_bm          -       stop bus master
 *      @host: InitIO we are stopping
 *
 *      Stop any pending DMA operation, aborting the DMA if necessary
 */



static void initio_stop_bm(struct initio_host * host)
{

	if (inb(host->addr + TUL_XStatus) & XPEND) {	/* if DMA xfer is pending, abort DMA xfer */
		outb(TAX_X_ABT | TAX_X_CLR_FIFO, host->addr + TUL_XCmd);
		/* wait Abort DMA xfer done */
		while ((inb(host->addr + TUL_Int) & XABT) == 0)
			cpu_relax();
	}
	outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
}

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/**
 *      initio_reset_scsi               -       Reset SCSI host controller
 *      @host: InitIO host to reset
 *      @seconds: Recovery time
 *
 *      Perform a full reset of the SCSI subsystem.
 */



static int initio_reset_scsi(struct initio_host * host, int seconds)
{
	outb(TSC_RST_BUS, host->addr + TUL_SCtrl0);

	while (!((host->jsint = inb(host->addr + TUL_SInt)) & TSS_SCSIRST_INT))
		cpu_relax();

	/* reset tulip chip */
	outb(0, host->addr + TUL_SSignal);

	/* Stall for a while, wait for target's firmware ready,make it 2 sec ! */
	/* SONY 5200 tape drive won't work if only stall for 1 sec */
	/* FIXME: this is a very long busy wait right now */
	initio_do_pause(seconds * HZ);

	inb(host->addr + TUL_SInt);
	return SCSI_RESET_SUCCESS;
}

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/**
 *      initio_init             -       set up an InitIO host adapter
 *      @host: InitIO host adapter
 *      @num_scbs: Number of SCBS
 *      @bios_addr: BIOS address
 *
 *      Set up the host adapter and devices according to the configuration
 *      retrieved from the E2PROM.
 *
 *      Locking: Calls E2PROM layer code which is not re-enterable so must
 *      run single threaded for now.
 */



static void initio_init(struct initio_host * host, u8 *bios_addr)
{
	int i;
	u8 *flags;
	u8 *heads;

	/* Get E2Prom configuration */
	initio_read_eeprom(host->addr);
	if (i91unvramp->NVM_SCSIInfo[0].NVM_NumOfTarg == 8)
		host->max_tar = 8;
	else
		host->max_tar = 16;

	host->config = i91unvramp->NVM_SCSIInfo[0].NVM_ChConfig1;

	host->scsi_id = i91unvramp->NVM_SCSIInfo[0].NVM_ChSCSIID;
	host->idmask = ~(1 << host->scsi_id);

#ifdef CHK_PARITY
	/* Enable parity error response */
	outb(inb(host->addr + TUL_PCMD) | 0x40, host->addr + TUL_PCMD);
#endif

	/* Mask all the interrupt       */
	outb(0x1F, host->addr + TUL_Mask);

	initio_stop_bm(host);
	/* --- Initialize the tulip --- */
	outb(TSC_RST_CHIP, host->addr + TUL_SCtrl0);

	/* program HBA's SCSI ID        */
	outb(host->scsi_id << 4, host->addr + TUL_SScsiId);

	/* Enable Initiator Mode ,phase latch,alternate sync period mode,
           disable SCSI reset */
	if (host->config & HCC_EN_PAR)
		host->sconf1 = (TSC_INITDEFAULT | TSC_EN_SCSI_PAR);
	else
		host->sconf1 = (TSC_INITDEFAULT);
	outb(host->sconf1, host->addr + TUL_SConfig);

	/* Enable HW reselect */
	outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1);

	outb(0, host->addr + TUL_SPeriod);

	/* selection time out = 250 ms */
	outb(153, host->addr + TUL_STimeOut);

	/* Enable SCSI terminator */
	outb((host->config & (HCC_ACT_TERM1 | HCC_ACT_TERM2)),
		host->addr + TUL_XCtrl);
	outb(((host->config & HCC_AUTO_TERM) >> 4) |
		(inb(host->addr + TUL_GCTRL1) & 0xFE),
		host->addr + TUL_GCTRL1);

	for (i = 0,
	     flags = & (i91unvramp->NVM_SCSIInfo[0].NVM_Targ0Config),
	     heads = bios_addr + 0x180;
	     i < host->max_tar;
	     i++, flags++) {
		host->targets[i].flags = *flags & ~(TCF_SYNC_DONE | TCF_WDTR_DONE);
		if (host->targets[i].flags & TCF_EN_255)
			host->targets[i].drv_flags = TCF_DRV_255_63;
		else
			host->targets[i].drv_flags = 0;
		host->targets[i].js_period = 0;
		host->targets[i].sconfig0 = host->sconf1;
		host->targets[i].heads = *heads++;
		if (host->targets[i].heads == 255)
			host->targets[i].drv_flags = TCF_DRV_255_63;
		else
			host->targets[i].drv_flags = 0;
		host->targets[i].sectors = *heads++;
		host->targets[i].flags &= ~TCF_BUSY;
		host->act_tags[i] = 0;
		host->max_tags[i] = 0xFF;
	}			/* for                          */
	printk("i91u: PCI Base=0x%04X, IRQ=%d, BIOS=0x%04X0, SCSI ID=%d\n",
	       host->addr, host->pci_dev->irq,
	       host->bios_addr, host->scsi_id);
	/* Reset SCSI Bus */
	if (host->config & HCC_SCSI_RESET) {
		printk(KERN_INFO "i91u: Reset SCSI Bus ... \n");
		initio_reset_scsi(host, 10);
	}
	outb(0x17, host->addr + TUL_SCFG1);
	outb(0xE9, host->addr + TUL_SIntEnable);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
391
67.07%
1
20.00%
Alan Cox
189
32.42%
2
40.00%
Olaf Hering
2
0.34%
1
20.00%
Adrian Bunk
1
0.17%
1
20.00%
Total
583
100.00%
5
100.00%

/**
 *      initio_alloc_scb                -       Allocate an SCB
 *      @host: InitIO host we are allocating for
 *
 *      Walk the SCB list for the controller and allocate a free SCB if
 *      one exists.
 */


static struct scsi_ctrl_blk *initio_alloc_scb(struct initio_host *host)
{
	struct scsi_ctrl_blk *scb;
	unsigned long flags;

	spin_lock_irqsave(&host->avail_lock, flags);
	if ((scb = host->first_avail) != NULL) {
#if DEBUG_QUEUE
		printk("find scb at %p\n", scb);
#endif
		if ((host->first_avail = scb->next) == NULL)
			host->last_avail = NULL;
		scb->next = NULL;
		scb->status = SCB_RENT;
	}
	spin_unlock_irqrestore(&host->avail_lock, flags);
	return scb;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
71
68.93%
1
33.33%
Alan Cox
31
30.10%
1
33.33%
Adrian Bunk
1
0.97%
1
33.33%
Total
103
100.00%
3
100.00%

/**
 *      initio_release_scb              -       Release an SCB
 *      @host: InitIO host that owns the SCB
 *      @cmnd: SCB command block being returned
 *
 *      Return an allocated SCB to the host free list
 */



static void initio_release_scb(struct initio_host * host, struct scsi_ctrl_blk * cmnd)
{
	unsigned long flags;

#if DEBUG_QUEUE
	printk("Release SCB %p; ", cmnd);
#endif
	spin_lock_irqsave(&(host->avail_lock), flags);
	cmnd->srb = NULL;
	cmnd->status = 0;
	cmnd->next = NULL;
	if (host->last_avail != NULL) {
		host->last_avail->next = cmnd;
		host->last_avail = cmnd;
	} else {
		host->first_avail = cmnd;
		host->last_avail = cmnd;
	}
	spin_unlock_irqrestore(&(host->avail_lock), flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
75
66.37%
1
25.00%
Alan Cox
36
31.86%
1
25.00%
Adrian Bunk
1
0.88%
1
25.00%
Al Viro
1
0.88%
1
25.00%
Total
113
100.00%
4
100.00%

/***************************************************************************/


static void initio_append_pend_scb(struct initio_host * host, struct scsi_ctrl_blk * scbp)
{

#if DEBUG_QUEUE
	printk("Append pend SCB %p; ", scbp);
#endif
	scbp->status = SCB_PEND;
	scbp->next = NULL;
	if (host->last_pending != NULL) {
		host->last_pending->next = scbp;
		host->last_pending = scbp;
	} else {
		host->first_pending = scbp;
		host->last_pending = scbp;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
58
73.42%
1
33.33%
Alan Cox
20
25.32%
1
33.33%
Adrian Bunk
1
1.27%
1
33.33%
Total
79
100.00%
3
100.00%

/***************************************************************************/


static void initio_push_pend_scb(struct initio_host * host, struct scsi_ctrl_blk * scbp)
{

#if DEBUG_QUEUE
	printk("Push pend SCB %p; ", scbp);
#endif
	scbp->status = SCB_PEND;
	if ((scbp->next = host->first_pending) != NULL) {
		host->first_pending = scbp;
	} else {
		host->first_pending = scbp;
		host->last_pending = scbp;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
53
74.65%
1
33.33%
Alan Cox
17
23.94%
1
33.33%
Adrian Bunk
1
1.41%
1
33.33%
Total
71
100.00%
3
100.00%



static struct scsi_ctrl_blk *initio_find_first_pend_scb(struct initio_host * host)
{
	struct scsi_ctrl_blk *first;


	first = host->first_pending;
	while (first != NULL) {
		if (first->opcode != ExecSCSI)
			return first;
		if (first->tagmsg == 0) {
			if ((host->act_tags[first->target] == 0) &&
			    !(host->targets[first->target].flags & TCF_BUSY))
				return first;
		} else {
			if ((host->act_tags[first->target] >=
			  host->max_tags[first->target]) |
			    (host->targets[first->target].flags & TCF_BUSY)) {
				first = first->next;
				continue;
			}
			return first;
		}
		first = first->next;
	}
	return first;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
98
66.22%
1
33.33%
Alan Cox
49
33.11%
1
33.33%
Adrian Bunk
1
0.68%
1
33.33%
Total
148
100.00%
3
100.00%



static void initio_unlink_pend_scb(struct initio_host * host, struct scsi_ctrl_blk * scb)
{
	struct scsi_ctrl_blk *tmp, *prev;

#if DEBUG_QUEUE
	printk("unlink pend SCB %p; ", scb);