Subversion Repositories or1k

/*
 *  linux/drivers/acorn/scsi/cumana_2.c
 *
 *  Copyright (C) 1997-2002 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Changelog:
 *   30-08-1997	RMK	0.0.0	Created, READONLY version.
 *   22-01-1998	RMK	0.0.1	Updated to 2.1.80.
 *   15-04-1998	RMK	0.0.1	Only do PIO if FAS216 will allow it.
 *   02-05-1998	RMK	0.0.2	Updated & added DMA support.
 *   27-06-1998	RMK		Changed asm/delay.h to linux/delay.h
 *   18-08-1998	RMK	0.0.3	Fixed synchronous transfer depth.
 *   02-04-2000	RMK	0.0.4	Updated for new error handling code.
 */
#include <linux/module.h>
#include <linux/blk.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/init.h>
 
#include <asm/dma.h>
#include <asm/ecard.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/pgtable.h>
 
#include "../../scsi/sd.h"
#include "../../scsi/hosts.h"
#include "fas216.h"
#include "scsi.h"
 
#include <scsi/scsicam.h>
 
/*
 * List of devices that the driver will recognise
 */
#define CUMANASCSI2_LIST		{ MANU_CUMANA, PROD_CUMANA_SCSI_2 }
 
#define CUMANASCSI2_STATUS		(0)
#define STATUS_INT			(1 << 0)
#define STATUS_DRQ			(1 << 1)
#define STATUS_LATCHED			(1 << 3)
 
#define CUMANASCSI2_ALATCH		(5)
#define ALATCH_ENA_INT			(3)
#define ALATCH_DIS_INT			(2)
#define ALATCH_ENA_TERM			(5)
#define ALATCH_DIS_TERM			(4)
#define ALATCH_ENA_BIT32		(11)
#define ALATCH_DIS_BIT32		(10)
#define ALATCH_ENA_DMA			(13)
#define ALATCH_DIS_DMA			(12)
#define ALATCH_DMA_OUT			(15)
#define ALATCH_DMA_IN			(14)
 
#define CUMANASCSI2_PSEUDODMA		(0x80)
 
#define CUMANASCSI2_FAS216_OFFSET	(0xc0)
#define CUMANASCSI2_FAS216_SHIFT	0
 
/*
 * Version
 */
#define VERSION "1.00 (13/11/2002 2.4.19-rmk5)"
 
/*
 * Use term=0,1,0,0,0 to turn terminators on/off
 */
static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
 
#define NR_SG	256
 
struct cumanascsi2_info {
	FAS216_Info		info;
	struct expansion_card	*ec;
 
	unsigned int		status;		/* card status register	*/
	unsigned int		alatch;		/* Control register	*/
	unsigned int		terms;		/* Terminator state	*/
	unsigned int		dmaarea;	/* Pseudo DMA area	*/
	struct scatterlist	sg[NR_SG];	/* Scatter DMA list	*/
};
 
#define CSTATUS_IRQ	(1 << 0)
#define CSTATUS_DRQ	(1 << 1)
 
/* Prototype: void cumanascsi_2_irqenable(ec, irqnr)
 * Purpose  : Enable interrupts on Cumana SCSI 2 card
 * Params   : ec    - expansion card structure
 *          : irqnr - interrupt number
 */
static void
cumanascsi_2_irqenable(struct expansion_card *ec, int irqnr)
{
	unsigned int port = (unsigned int)ec->irq_data;
	outb(ALATCH_ENA_INT, port);
}
 
/* Prototype: void cumanascsi_2_irqdisable(ec, irqnr)
 * Purpose  : Disable interrupts on Cumana SCSI 2 card
 * Params   : ec    - expansion card structure
 *          : irqnr - interrupt number
 */
static void
cumanascsi_2_irqdisable(struct expansion_card *ec, int irqnr)
{
	unsigned int port = (unsigned int)ec->irq_data;
	outb(ALATCH_DIS_INT, port);
}
 
static const expansioncard_ops_t cumanascsi_2_ops = {
	.irqenable	= cumanascsi_2_irqenable,
	.irqdisable	= cumanascsi_2_irqdisable,
};
 
/* Prototype: void cumanascsi_2_terminator_ctl(host, on_off)
 * Purpose  : Turn the Cumana SCSI 2 terminators on or off
 * Params   : host   - card to turn on/off
 *          : on_off - !0 to turn on, 0 to turn off
 */
static void
cumanascsi_2_terminator_ctl(struct Scsi_Host *host, int on_off)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 
	if (on_off) {
		info->terms = 1;
		outb (ALATCH_ENA_TERM, info->alatch);
	} else {
		info->terms = 0;
		outb (ALATCH_DIS_TERM, info->alatch);
	}
}
 
/* Prototype: void cumanascsi_2_intr(irq, *dev_id, *regs)
 * Purpose  : handle interrupts from Cumana SCSI 2 card
 * Params   : irq    - interrupt number
 *	      dev_id - user-defined (Scsi_Host structure)
 *	      regs   - processor registers at interrupt
 */
static void
cumanascsi_2_intr(int irq, void *dev_id, struct pt_regs *regs)
{
	fas216_intr(dev_id);
}
 
/* Prototype: fasdmatype_t cumanascsi_2_dma_setup(host, SCpnt, direction, min_type)
 * Purpose  : initialises DMA/PIO
 * Params   : host      - host
 *	      SCpnt     - command
 *	      direction - DMA on to/off of card
 *	      min_type  - minimum DMA support that we must have for this transfer
 * Returns  : type of transfer to be performed
 */
static fasdmatype_t
cumanascsi_2_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp,
		       fasdmadir_t direction, fasdmatype_t min_type)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
	int dmach = host->dma_channel;
 
	outb(ALATCH_DIS_DMA, info->alatch);
 
	if (dmach != NO_DMA &&
	    (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
		int bufs, map_dir, dma_dir, alatch_dir;
 
		bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
 
		if (direction == DMA_OUT)
			map_dir = PCI_DMA_TODEVICE,
			dma_dir = DMA_MODE_WRITE,
			alatch_dir = ALATCH_DMA_OUT;
		else
			map_dir = PCI_DMA_FROMDEVICE,
			dma_dir = DMA_MODE_READ,
			alatch_dir = ALATCH_DMA_IN;
 
		pci_map_sg(NULL, info->sg, bufs, map_dir);
 
		disable_dma(dmach);
		set_dma_sg(dmach, info->sg, bufs);
		outb(alatch_dir, info->alatch);
		set_dma_mode(dmach, dma_dir);
		enable_dma(dmach);
		outb(ALATCH_ENA_DMA, info->alatch);
		outb(ALATCH_DIS_BIT32, info->alatch);
		return fasdma_real_all;
	}
 
	/*
	 * If we're not doing DMA,
	 *  we'll do pseudo DMA
	 */
	return fasdma_pio;
}
 
/*
 * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer)
 * Purpose  : handles pseudo DMA
 * Params   : host      - host
 *	      SCpnt     - command
 *	      direction - DMA on to/off of card
 *	      transfer  - minimum number of bytes we expect to transfer
 */
static void
cumanascsi_2_dma_pseudo(struct Scsi_Host *host, Scsi_Pointer *SCp,
			fasdmadir_t direction, int transfer)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
	unsigned int length;
	unsigned char *addr;
 
	length = SCp->this_residual;
	addr = SCp->ptr;
 
	if (direction == DMA_OUT)
#if 0
		while (length > 1) {
			unsigned long word;
			unsigned int status = inb(info->status);
 
			if (status & STATUS_INT)
				goto end;
 
			if (!(status & STATUS_DRQ))
				continue;
 
			word = *addr | *(addr + 1) << 8;
			outw (info->dmaarea);
			addr += 2;
			length -= 2;
		}
#else
		printk ("PSEUDO_OUT???\n");
#endif
	else {
		if (transfer && (transfer & 255)) {
			while (length >= 256) {
				unsigned int status = inb(info->status);
 
				if (status & STATUS_INT)
					return;
 
				if (!(status & STATUS_DRQ))
					continue;
 
				insw(info->dmaarea, addr, 256 >> 1);
				addr += 256;
				length -= 256;
			}
		}
 
		while (length > 0) {
			unsigned long word;
			unsigned int status = inb(info->status);
 
			if (status & STATUS_INT)
				return;
 
			if (!(status & STATUS_DRQ))
				continue;
 
			word = inw (info->dmaarea);
			*addr++ = word;
			if (--length > 0) {
				*addr++ = word >> 8;
				length --;
			}
		}
	}
}
 
/* Prototype: int cumanascsi_2_dma_stop(host, SCpnt)
 * Purpose  : stops DMA/PIO
 * Params   : host  - host
 *	      SCpnt - command
 */
static void
cumanascsi_2_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
	if (host->dma_channel != NO_DMA) {
		outb(ALATCH_DIS_DMA, info->alatch);
		disable_dma(host->dma_channel);
	}
}
 
/* Prototype: const char *cumanascsi_2_info(struct Scsi_Host * host)
 * Purpose  : returns a descriptive string about this interface,
 * Params   : host - driver host structure to return info for.
 * Returns  : pointer to a static buffer containing null terminated string.
 */
const char *cumanascsi_2_info(struct Scsi_Host *host)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
	static char string[150];
 
	sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
		host->hostt->name, info->info.scsi.type, info->ec->slot_no,
		VERSION, info->terms ? "n" : "ff");
 
	return string;
}
 
/* Prototype: int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 * Purpose  : Set a driver specific function
 * Params   : host   - host to setup
 *          : buffer - buffer containing string describing operation
 *          : length - length of string
 * Returns  : -EINVAL, or 0
 */
static int
cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
{
	int ret = length;
 
	if (length >= 11 && strcmp(buffer, "CUMANASCSI2") == 0) {
		buffer += 11;
		length -= 11;
 
		if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
			if (buffer[5] == '1')
				cumanascsi_2_terminator_ctl(host, 1);
			else if (buffer[5] == '0')
				cumanascsi_2_terminator_ctl(host, 0);
			else
				ret = -EINVAL;
		} else
			ret = -EINVAL;
	} else
		ret = -EINVAL;
 
	return ret;
}
 
/* Prototype: int cumanascsi_2_proc_info(char *buffer, char **start, off_t offset,
 *					 int length, int host_no, int inout)
 * Purpose  : Return information about the driver to a user process accessing
 *	      the /proc filesystem.
 * Params   : buffer - a buffer to write information to
 *	      start  - a pointer into this buffer set by this routine to the start
 *		       of the required information.
 *	      offset - offset into information that we have read upto.
 *	      length - length of buffer
 *	      host_no - host number to return information for
 *	      inout  - 0 for reading, 1 for writing.
 * Returns  : length of data written to buffer.
 */
int cumanascsi_2_proc_info (char *buffer, char **start, off_t offset,
			    int length, int host_no, int inout)
{
	int pos, begin;
	struct Scsi_Host *host;
	struct cumanascsi2_info *info;
	Scsi_Device *scd;
 
	host = scsi_host_hn_get(host_no);
	if (!host)
		return 0;
 
	if (inout == 1)
		return cumanascsi_2_set_proc_info(host, buffer, length);
 
	info = (struct cumanascsi2_info *)host->hostdata;
 
	begin = 0;
	pos = sprintf(buffer, "Cumana SCSI II driver v%s\n", VERSION);
	pos += fas216_print_host(&info->info, buffer + pos);
	pos += sprintf(buffer + pos, "Term    : o%s\n",
			info->terms ? "n" : "ff");
 
	pos += fas216_print_stats(&info->info, buffer + pos);
 
	pos += sprintf(buffer+pos, "\nAttached devices:\n");
 
	for (scd = host->host_queue; scd; scd = scd->next) {
		int len;
 
		proc_print_scsidevice(scd, buffer, &len, pos);
		pos += len;
		pos += sprintf(buffer+pos, "Extensions: ");
		if (scd->tagged_supported)
			pos += sprintf(buffer+pos, "TAG %sabled [%d] ",
				       scd->tagged_queue ? "en" : "dis",
				       scd->current_tag);
		pos += sprintf(buffer+pos, "\n");
 
		if (pos + begin < offset) {
			begin += pos;
			pos = 0;
		}
		if (pos + begin > offset + length)
			break;
	}
 
	*start = buffer + (offset - begin);
	pos -= offset - begin;
	if (pos > length)
		pos = length;
 
	return pos;
}
 
static int cumanascsi2_probe(struct expansion_card *ec);
 
/* Prototype: int cumanascsi_2_detect(Scsi_Host_Template * tpnt)
 * Purpose  : initialises Cumana SCSI 2 driver
 * Params   : tpnt - template for this SCSI adapter
 * Returns  : >0 if host found, 0 otherwise.
 */
static int
cumanascsi_2_detect(Scsi_Host_Template *tpnt)
{
	static const card_ids cumanascsi_2_cids[] =
			{ CUMANASCSI2_LIST, { 0xffff, 0xffff} };
	int count = 0, ret;
 
	ecard_startfind();
 
	while (1) {
	    	struct expansion_card *ec;
 
		ec = ecard_find(0, cumanascsi_2_cids);
		if (!ec)
			break;
 
		ecard_claim(ec);
		ret = cumanascsi2_probe(ec);
		if (ret) {
			ecard_release(ec);
			break;
		}
 
		++count;
	}
	return count;
}
 
static void cumanascsi2_remove(struct Scsi_Host *host);
 
/* Prototype: int cumanascsi_2_release(struct Scsi_Host * host)
 * Purpose  : releases all resources used by this adapter
 * Params   : host - driver host structure to return info for.
 */
static int cumanascsi_2_release(struct Scsi_Host *host)
{
	cumanascsi2_remove(host);
	return 0;
}
 
static Scsi_Host_Template cumanascsi2_template = {
	.module				= THIS_MODULE,
	.proc_info			= cumanascsi_2_proc_info,
	.name				= "Cumana SCSI II",
	.detect				= cumanascsi_2_detect,
	.release			= cumanascsi_2_release,
	.info				= cumanascsi_2_info,
	.bios_param			= scsicam_bios_param,
	.command			= fas216_command,
	.queuecommand			= fas216_queue_command,
	.eh_host_reset_handler		= fas216_eh_host_reset,
	.eh_bus_reset_handler		= fas216_eh_bus_reset,
	.eh_device_reset_handler	= fas216_eh_device_reset,
	.eh_abort_handler		= fas216_eh_abort,
	.use_new_eh_code		= 1,
 
	.can_queue			= 1,
	.this_id			= 7,
	.sg_tablesize			= SG_ALL,
	.cmd_per_lun			= 1,
	.use_clustering			= DISABLE_CLUSTERING,
	.proc_name			= "cumanascsi2",
};
 
static int
cumanascsi2_probe(struct expansion_card *ec)
{
	struct Scsi_Host *host;
    	struct cumanascsi2_info *info;
    	unsigned long base;
    	int ret;
 
    	base = ecard_address(ec, ECARD_MEMC, 0);
 
	if (request_region(base + CUMANASCSI2_FAS216_OFFSET,
			   16 << CUMANASCSI2_FAS216_SHIFT, "cumanascsi2-fas")) {
		ret = -EBUSY;
		goto out;
	}
 
	host = scsi_register(&cumanascsi2_template,
			     sizeof(struct cumanascsi2_info));
	if (!host) {
		ret = -ENOMEM;
		goto out_region;
	}
 
	host->io_port = base;
	host->irq = ec->irq;
	host->dma_channel = ec->dma;
 
	info = (struct cumanascsi2_info *)host->hostdata;
	info->ec	= ec;
	info->dmaarea	= base + CUMANASCSI2_PSEUDODMA;
	info->status	= base + CUMANASCSI2_STATUS;
	info->alatch	= base + CUMANASCSI2_ALATCH;
 
	ec->irqaddr	= (unsigned char *)ioaddr(info->status);
	ec->irqmask	= STATUS_INT;
	ec->irq_data	= (void *)base + CUMANASCSI2_ALATCH;
	ec->ops		= (expansioncard_ops_t *)&cumanascsi_2_ops;
 
	cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);
 
	info->info.scsi.io_port		= base + CUMANASCSI2_FAS216_OFFSET;
	info->info.scsi.io_shift	= CUMANASCSI2_FAS216_SHIFT;
	info->info.scsi.irq		= host->irq;
	info->info.ifcfg.clockrate	= 40; /* MHz */
	info->info.ifcfg.select_timeout	= 255;
	info->info.ifcfg.asyncperiod	= 200; /* ns */
	info->info.ifcfg.sync_max_depth	= 7;
	info->info.ifcfg.cntl3		= CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
	info->info.ifcfg.disconnect_ok	= 1;
	info->info.ifcfg.wide_max_size	= 0;
	info->info.ifcfg.capabilities	= 0;
	info->info.dma.setup		= cumanascsi_2_dma_setup;
	info->info.dma.pseudo		= cumanascsi_2_dma_pseudo;
	info->info.dma.stop		= cumanascsi_2_dma_stop;
 
	ret = fas216_init(host);
	if (ret)
		goto out_free;
 
	ret = request_irq(host->irq, cumanascsi_2_intr,
			SA_INTERRUPT, "cumanascsi2", &info->info);
	if (ret) {
		printk("scsi%d: IRQ%d not free: %d\n",
		       host->host_no, host->irq, ret);
		goto out_release;
	}
 
	if (host->dma_channel != NO_DMA) {
		if (request_dma(host->dma_channel, "cumanascsi2")) {
			printk("scsi%d: DMA%d not free, using PIO\n",
			       host->host_no, host->dma_channel);
			host->dma_channel = NO_DMA;
		} else {
			set_dma_speed(host->dma_channel, 180);
			info->info.ifcfg.capabilities |= FASCAP_DMA;
		}
	}
 
	ret = fas216_add(host);
	if (ret == 0)
		goto out;
 
	if (host->dma_channel != NO_DMA)
		free_dma(host->dma_channel);
	free_irq(host->irq, host);
 
 out_release:
	fas216_release(host);
 
 out_free:
	scsi_unregister(host);
 
 out_region:
	release_region(base + CUMANASCSI2_FAS216_OFFSET,
		       16 << CUMANASCSI2_FAS216_SHIFT);
 
 out:
	return ret;
}
 
static void cumanascsi2_remove(struct Scsi_Host *host)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 
	fas216_remove(host);
 
	if (host->dma_channel != NO_DMA)
		free_dma(host->dma_channel);
	free_irq(host->irq, host);
 
	release_region(host->io_port + CUMANASCSI2_FAS216_OFFSET,
		       16 << CUMANASCSI2_FAS216_SHIFT);
 
	fas216_release(host);
	ecard_release(info->ec);
}
 
static int __init cumanascsi2_init(void)
{
	scsi_register_module(MODULE_SCSI_HA, &cumanascsi2_template);
	if (cumanascsi2_template.present)
		return 0;
 
	scsi_unregister_module(MODULE_SCSI_HA, &cumanascsi2_template);
	return -ENODEV;
}
 
static void __exit cumanascsi2_exit(void)
{
	scsi_unregister_module(MODULE_SCSI_HA, &cumanascsi2_template);
}
 
module_init(cumanascsi2_init);
module_exit(cumanascsi2_exit);
 
MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");
MODULE_PARM(term, "1-8i");
MODULE_PARM_DESC(term, "SCSI bus termination");
MODULE_LICENSE("GPL");
EXPORT_NO_SYMBOLS;