initio.c

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/**************************************************************************
 * Initio 9100 device driver for Linux.
 *
 * Copyright (c) 1994-1998 Initio Corporation
 * Copyright (c) 1998 Bas Vermeulen <[e-mail]>
 * Copyright (c) 2004 Christoph Hellwig <[e-mail]>
 * Copyright (c) 2007 Red Hat <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, 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 <[e-mail]>
 * 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"

#define I950_DEVICE_ID	0x9500	/* Initio's inic-950 product ID   */
#define I940_DEVICE_ID	0x9400	/* Initio's inic-940 product ID   */
#define I935_DEVICE_ID	0x9401	/* Initio's inic-935 product ID   */
#define I920_DEVICE_ID	0x0002	/* Initio's other product ID      */

#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);

/* PCI Devices supported by this driver */
static struct pci_device_id i91u_pci_devices[] = {
	{ PCI_VENDOR_ID_INIT,  I950_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{ PCI_VENDOR_ID_INIT,  I940_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{ PCI_VENDOR_ID_INIT,  I935_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{ PCI_VENDOR_ID_INIT,  I920_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{ PCI_VENDOR_ID_DOMEX, I920_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{ }
};
MODULE_DEVICE_TABLE(pci, i91u_pci_devices);

#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 devide 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();
}

/*-- 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);
}


/**
 *	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);
}


/**
 *	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);
}


/**
 *	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;
}

/**
 *	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 */
}

/**
 *	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;
}

/**
 *	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 */