sym53c416.c

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/*
 *  sym53c416.c
 *  Low-level SCSI driver for sym53c416 chip.
 *  Copyright (C) 1998 Lieven Willems ([e-mail])
 * 
 *  Changes : 
 * 
 *  Marcelo Tosatti <[e-mail]> : Added io_request_lock locking
 *  Alan Cox <[e-mail]> : Cleaned up code formatting
 *				 Fixed an irq locking bug
 *				 Added ISAPnP support
 *  Bjoern A. Zeeb <[e-mail]> : Initial irq locking updates
 *					  Added another card with ISAPnP support
 * 
 *  LILO command line usage: sym53c416=<PORTBASE>[,<IRQ>]
 *
 *  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.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <asm/dma.h>
#include <asm/system.h>
#include <asm/io.h>
#include <linux/blkdev.h>
#include <linux/isapnp.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#include "sym53c416.h"

#define VERSION_STRING        "Version 1.0.0-ac"

#define TC_LOW       0x00     /* Transfer counter low        */
#define TC_MID       0x01     /* Transfer counter mid        */
#define SCSI_FIFO    0x02     /* SCSI FIFO register          */
#define COMMAND_REG  0x03     /* Command Register            */
#define STATUS_REG   0x04     /* Status Register (READ)      */
#define DEST_BUS_ID  0x04     /* Destination Bus ID (WRITE)  */
#define INT_REG      0x05     /* Interrupt Register (READ)   */
#define TOM          0x05     /* Time out multiplier (WRITE) */
#define STP          0x06     /* Synchronous Transfer period */
#define SYNC_OFFSET  0x07     /* Synchronous Offset          */
#define CONF_REG_1   0x08     /* Configuration register 1    */
#define CONF_REG_2   0x0B     /* Configuration register 2    */
#define CONF_REG_3   0x0C     /* Configuration register 3    */
#define CONF_REG_4   0x0D     /* Configuration register 4    */
#define TC_HIGH      0x0E     /* Transfer counter high       */
#define PIO_FIFO_1   0x10     /* PIO FIFO register 1         */
#define PIO_FIFO_2   0x11     /* PIO FIFO register 2         */
#define PIO_FIFO_3   0x12     /* PIO FIFO register 3         */
#define PIO_FIFO_4   0x13     /* PIO FIFO register 4         */
#define PIO_FIFO_CNT 0x14     /* PIO FIFO count              */
#define PIO_INT_REG  0x15     /* PIO interrupt register      */
#define CONF_REG_5   0x16     /* Configuration register 5    */
#define FEATURE_EN   0x1D     /* Feature Enable register     */

/* Configuration register 1 entries: */
/* Bits 2-0: SCSI ID of host adapter */
#define SCM    0x80                     /* Slow Cable Mode              */
#define SRID   0x40                     /* SCSI Reset Interrupt Disable */
#define PTM    0x20                     /* Parity Test Mode             */
#define EPC    0x10                     /* Enable Parity Checking       */
#define CTME   0x08                     /* Special Test Mode            */

/* Configuration register 2 entries: */
#define FE     0x40                     /* Features Enable              */
#define SCSI2  0x08                     /* SCSI 2 Enable                */
#define TBPA   0x04                     /* Target Bad Parity Abort      */

/* Configuration register 3 entries: */
#define IDMRC  0x80                     /* ID Message Reserved Check    */
#define QTE    0x40                     /* Queue Tag Enable             */
#define CDB10  0x20                     /* Command Descriptor Block 10  */
#define FSCSI  0x10                     /* FastSCSI                     */
#define FCLK   0x08                     /* FastClock                    */

/* Configuration register 4 entries: */
#define RBS    0x08                     /* Register bank select         */
#define EAN    0x04                     /* Enable Active Negotiation    */

/* Configuration register 5 entries: */
#define LPSR   0x80                     /* Lower Power SCSI Reset       */
#define IE     0x20                     /* Interrupt Enable             */
#define LPM    0x02                     /* Low Power Mode               */
#define WSE0   0x01                     /* 0WS Enable                   */

/* Interrupt register entries: */
#define SRST   0x80                     /* SCSI Reset                   */
#define ILCMD  0x40                     /* Illegal Command              */
#define DIS    0x20                     /* Disconnect                   */
#define BS     0x10                     /* Bus Service                  */
#define FC     0x08                     /* Function Complete            */
#define RESEL  0x04                     /* Reselected                   */
#define SI     0x03                     /* Selection Interrupt          */

/* Status Register Entries: */
#define SCI    0x80                     /* SCSI Core Int                */
#define GE     0x40                     /* Gross Error                  */
#define PE     0x20                     /* Parity Error                 */
#define TC     0x10                     /* Terminal Count               */
#define VGC    0x08                     /* Valid Group Code             */
#define PHBITS 0x07                     /* Phase bits                   */

/* PIO Interrupt Register Entries: */
#define SCI    0x80                     /* SCSI Core Int                */
#define PFI    0x40                     /* PIO FIFO Interrupt           */
#define FULL   0x20                     /* PIO FIFO Full                */
#define EMPTY  0x10                     /* PIO FIFO Empty               */
#define CE     0x08                     /* Collision Error              */
#define OUE    0x04                     /* Overflow / Underflow error   */
#define FIE    0x02                     /* Full Interrupt Enable        */
#define EIE    0x01                     /* Empty Interrupt Enable       */

/* SYM53C416 SCSI phases (lower 3 bits of SYM53C416_STATUS_REG) */
#define PHASE_DATA_OUT    0x00
#define PHASE_DATA_IN     0x01
#define PHASE_COMMAND     0x02
#define PHASE_STATUS      0x03
#define PHASE_RESERVED_1  0x04
#define PHASE_RESERVED_2  0x05
#define PHASE_MESSAGE_OUT 0x06
#define PHASE_MESSAGE_IN  0x07

/* SYM53C416 core commands */
#define NOOP                      0x00
#define FLUSH_FIFO                0x01
#define RESET_CHIP                0x02
#define RESET_SCSI_BUS            0x03
#define DISABLE_SEL_RESEL         0x45
#define RESEL_SEQ                 0x40
#define SEL_WITHOUT_ATN_SEQ       0x41
#define SEL_WITH_ATN_SEQ          0x42
#define SEL_WITH_ATN_AND_STOP_SEQ 0x43
#define ENABLE_SEL_RESEL          0x44
#define SEL_WITH_ATN3_SEQ         0x46
#define RESEL3_SEQ                0x47
#define SND_MSG                   0x20
#define SND_STAT                  0x21
#define SND_DATA                  0x22
#define DISCONNECT_SEQ            0x23
#define TERMINATE_SEQ             0x24
#define TARGET_COMM_COMPLETE_SEQ  0x25
#define DISCONN                   0x27
#define RECV_MSG_SEQ              0x28
#define RECV_CMD                  0x29
#define RECV_DATA                 0x2A
#define RECV_CMD_SEQ              0x2B
#define TARGET_ABORT_PIO          0x04
#define TRANSFER_INFORMATION      0x10
#define INIT_COMM_COMPLETE_SEQ    0x11
#define MSG_ACCEPTED              0x12
#define TRANSFER_PAD              0x18
#define SET_ATN                   0x1A
#define RESET_ATN                 0x1B
#define ILLEGAL                   0xFF

#define PIO_MODE                  0x80

#define IO_RANGE 0x20         /* 0x00 - 0x1F                   */
#define ID       "sym53c416"	/* Attention: copied to the sym53c416.h */
#define PIO_SIZE 128          /* Size of PIO fifo is 128 bytes */

#define READ_TIMEOUT              150
#define WRITE_TIMEOUT             150

#ifdef MODULE

#define sym53c416_base sym53c416
#define sym53c416_base_1 sym53c416_1
#define sym53c416_base_2 sym53c416_2
#define sym53c416_base_3 sym53c416_3

static unsigned int sym53c416_base[2] = {0,0};
static unsigned int sym53c416_base_1[2] = {0,0};
static unsigned int sym53c416_base_2[2] = {0,0};
static unsigned int sym53c416_base_3[2] = {0,0};

#endif

#define MAXHOSTS 4

#define SG_ADDRESS(buffer)     ((char *) (page_address((buffer)->page)+(buffer)->offset))

enum phases
{
	idle,
	data_out,
	data_in,
	command_ph,
	status_ph,
	message_out,
	message_in
};

typedef struct
{
	int base;
	int irq;
	int scsi_id;
} host;

static host hosts[MAXHOSTS] = {
                       {0, 0, SYM53C416_SCSI_ID},
                       {0, 0, SYM53C416_SCSI_ID},
                       {0, 0, SYM53C416_SCSI_ID},
                       {0, 0, SYM53C416_SCSI_ID}
                       };

static int host_index = 0;
static char info[120];
static Scsi_Cmnd *current_command = NULL;
static int fastpio = 1;

static int probeaddrs[] = {0x200, 0x220, 0x240, 0};

static void sym53c416_set_transfer_counter(int base, unsigned int len)
{
	/* Program Transfer Counter */
	outb(len & 0x0000FF, base + TC_LOW);
	outb((len & 0x00FF00) >> 8, base + TC_MID);
	outb((len & 0xFF0000) >> 16, base + TC_HIGH);
}

static spinlock_t sym53c416_lock = SPIN_LOCK_UNLOCKED;

/* Returns the number of bytes read */
static __inline__ unsigned int sym53c416_read(int base, unsigned char *buffer, unsigned int len)
{
	unsigned int orig_len = len;
	unsigned long flags = 0;
	unsigned int bytes_left;
	unsigned long i;
	int timeout = READ_TIMEOUT;

	/* Do transfer */
	spin_lock_irqsave(&sym53c416_lock, flags);
	while(len && timeout)
	{
		bytes_left = inb(base + PIO_FIFO_CNT); /* Number of bytes in the PIO FIFO */
		if(fastpio && bytes_left > 3)
		{
			insl(base + PIO_FIFO_1, buffer, bytes_left >> 2);
			buffer += bytes_left & 0xFC;
			len -= bytes_left & 0xFC;
		}
		else if(bytes_left > 0)
		{
			len -= bytes_left;
			for(; bytes_left > 0; bytes_left--)
				*(buffer++) = inb(base + PIO_FIFO_1);
		}
		else
		{
			i = jiffies + timeout;
			spin_unlock_irqrestore(&sym53c416_lock, flags);
			while(time_before(jiffies, i) && (inb(base + PIO_INT_REG) & EMPTY) && timeout)
				if(inb(base + PIO_INT_REG) & SCI)
					timeout = 0;
			spin_lock_irqsave(&sym53c416_lock, flags);
			if(inb(base + PIO_INT_REG) & EMPTY)
				timeout = 0;
		}
	}
	spin_unlock_irqrestore(&sym53c416_lock, flags);
	return orig_len - len;
}

/* Returns the number of bytes written */
static __inline__ unsigned int sym53c416_write(int base, unsigned char *buffer, unsigned int len)
{
	unsigned int orig_len = len;
	unsigned long flags = 0;
	unsigned int bufferfree;
	unsigned long i;
	unsigned int timeout = WRITE_TIMEOUT;

	/* Do transfer */
	spin_lock_irqsave(&sym53c416_lock, flags);
	while(len && timeout)
	{
		bufferfree = PIO_SIZE - inb(base + PIO_FIFO_CNT);
		if(bufferfree > len)
			bufferfree = len;
		if(fastpio && bufferfree > 3)
		{
			outsl(base + PIO_FIFO_1, buffer, bufferfree >> 2);
			buffer += bufferfree & 0xFC;
			len -= bufferfree & 0xFC;
		}
		else if(bufferfree > 0)
		{
			len -= bufferfree;
			for(; bufferfree > 0; bufferfree--)
				outb(*(buffer++), base + PIO_FIFO_1);
		}
		else
		{
			i = jiffies + timeout;
			spin_unlock_irqrestore(&sym53c416_lock, flags);
			while(time_before(jiffies, i) && (inb(base + PIO_INT_REG) & FULL) && timeout)
				;
			spin_lock_irqsave(&sym53c416_lock, flags);
			if(inb(base + PIO_INT_REG) & FULL)
				timeout = 0;
		}
	}
	spin_unlock_irqrestore(&sym53c416_lock, flags);
	return orig_len - len;
}

static irqreturn_t sym53c416_intr_handle(int irq, void *dev_id,
					struct pt_regs *regs)
{
	struct Scsi_Host *dev = dev_id;
	int base = 0;
	int i;
	unsigned long flags = 0;
	unsigned char status_reg, pio_int_reg, int_reg;
	struct scatterlist *sglist;
	unsigned int sgcount;
	unsigned int tot_trans = 0;

	/* We search the base address of the host adapter which caused the interrupt */
	/* FIXME: should pass dev_id sensibly as hosts[i] */
	for(i = 0; i < host_index && !base; i++)
		if(irq == hosts[i].irq)
			base = hosts[i].base;
	/* If no adapter found, we cannot handle the interrupt. Leave a message */
	/* and continue. This should never happen...                            */
	if(!base)
	{
		printk(KERN_ERR "sym53c416: No host adapter defined for interrupt %d\n", irq);
		return IRQ_NONE;
	}
	/* Now we have the base address and we can start handling the interrupt */

	spin_lock_irqsave(dev->host_lock,flags);
	status_reg = inb(base + STATUS_REG);
	pio_int_reg = inb(base + PIO_INT_REG);
	int_reg = inb(base + INT_REG);
	spin_unlock_irqrestore(dev->host_lock, flags);

	/* First, we handle error conditions */
	if(int_reg & SCI)         /* SCSI Reset */
	{
		printk(KERN_DEBUG "sym53c416: Reset received\n");
		current_command->SCp.phase = idle;
		current_command->result = DID_RESET << 16;
		spin_lock_irqsave(dev->host_lock, flags);
		current_command->scsi_done(current_command);
		spin_unlock_irqrestore(dev->host_lock, flags);
		goto out;
	}
	if(int_reg & ILCMD)       /* Illegal Command */
	{
		printk(KERN_WARNING "sym53c416: Illegal Command: 0x%02x.\n", inb(base + COMMAND_REG));
		current_command->SCp.phase = idle;
		current_command->result = DID_ERROR << 16;
		spin_lock_irqsave(dev->host_lock, flags);
		current_command->scsi_done(current_command);
		spin_unlock_irqrestore(dev->host_lock, flags);
		goto out;
	}
	if(status_reg & GE)         /* Gross Error */
	{
		printk(KERN_WARNING "sym53c416: Controller reports gross error.\n");
		current_command->SCp.phase = idle;
		current_command->result = DID_ERROR << 16;
		spin_lock_irqsave(dev->host_lock, flags);
		current_command->scsi_done(current_command);
		spin_unlock_irqrestore(dev->host_lock, flags);
		goto out;
	}
	if(status_reg & PE)         /* Parity Error */
	{
		printk(KERN_WARNING "sym53c416:SCSI parity error.\n");
		current_command->SCp.phase = idle;
		current_command->result = DID_PARITY << 16;
		spin_lock_irqsave(dev->host_lock, flags);
		current_command->scsi_done(current_command);
		spin_unlock_irqrestore(dev->host_lock, flags);
		goto out;
	}
	if(pio_int_reg & (CE | OUE))
	{
		printk(KERN_WARNING "sym53c416: PIO interrupt error.\n");
		current_command->SCp.phase = idle;
		current_command->result = DID_ERROR << 16;
		spin_lock_irqsave(dev->host_lock, flags);
		current_command->scsi_done(current_command);
		spin_unlock_irqrestore(dev->host_lock, flags);
		goto out;
	}
	if(int_reg & DIS)           /* Disconnect */
	{
		if(current_command->SCp.phase != message_in)
			current_command->result = DID_NO_CONNECT << 16;
		else
			current_command->result = (current_command->SCp.Status & 0xFF) | ((current_command->SCp.Message & 0xFF) << 8) | (DID_OK << 16);
		current_command->SCp.phase = idle;
		spin_lock_irqsave(dev->host_lock, flags);
		current_command->scsi_done(current_command);
		spin_unlock_irqrestore(dev->host_lock, flags);
		goto out;
	}
	/* Now we handle SCSI phases         */

	switch(status_reg & PHBITS)       /* Filter SCSI phase out of status reg */
	{
		case PHASE_DATA_OUT:
		{
			if(int_reg & BS)
			{
				current_command->SCp.phase = data_out;
				outb(FLUSH_FIFO, base + COMMAND_REG);
				sym53c416_set_transfer_counter(base, current_command->request_bufflen);
				outb(TRANSFER_INFORMATION | PIO_MODE, base + COMMAND_REG);
				if(!current_command->use_sg)
					tot_trans = sym53c416_write(base, current_command->request_buffer, current_command->request_bufflen);
				else
				{
					sgcount = current_command->use_sg;
					sglist = current_command->request_buffer;