[net-next-2.6.git] / drivers / scsi / arm / eesox.c

/*
 *  linux/drivers/acorn/scsi/eesox.c
 *
 *  Copyright (C) 1997-2005 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.
 *
 *  This driver is based on experimentation.  Hence, it may have made
 *  assumptions about the particular card that I have available, and
 *  may not be reliable!
 *
 *  Changelog:
 *   01-10-1997	RMK		Created, READONLY version
 *   15-02-1998	RMK		READ/WRITE version
 *				added DMA support and hardware definitions
 *   14-03-1998	RMK		Updated DMA support
 *				Added terminator control
 *   15-04-1998	RMK		Only do PIO if FAS216 will allow it.
 *   27-06-1998	RMK		Changed asm/delay.h to linux/delay.h
 *   02-04-2000	RMK	0.0.3	Fixed NO_IRQ/NO_DMA problem, updated for new
 *				error handling code.
 */
#include <linux/module.h>
#include <linux/blkdev.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/interrupt.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>

#include <asm/io.h>
#include <asm/dma.h>
#include <asm/ecard.h>
#include <asm/pgtable.h>

#include "../scsi.h"
#include <scsi/scsi_host.h>
#include "fas216.h"
#include "scsi.h"

#include <scsi/scsicam.h>

#define EESOX_FAS216_OFFSET	0x3000
#define EESOX_FAS216_SHIFT	5

#define EESOX_DMASTAT		0x2800
#define EESOX_STAT_INTR		0x01
#define EESOX_STAT_DMA		0x02

#define EESOX_CONTROL		0x2800
#define EESOX_INTR_ENABLE	0x04
#define EESOX_TERM_ENABLE	0x02
#define EESOX_RESET		0x01

#define EESOX_DMADATA		0x3800

#define VERSION "1.10 (17/01/2003 2.5.59)"

/*
 * 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 eesoxscsi_info {
	FAS216_Info		info;
	struct expansion_card	*ec;
	void __iomem		*base;
	void __iomem		*ctl_port;
	unsigned int		control;
	struct scatterlist	sg[NR_SG];	/* Scatter DMA list	*/
};

/* Prototype: void eesoxscsi_irqenable(ec, irqnr)
 * Purpose  : Enable interrupts on EESOX SCSI card
 * Params   : ec    - expansion card structure
 *          : irqnr - interrupt number
 */
static void
eesoxscsi_irqenable(struct expansion_card *ec, int irqnr)
{
	struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;

	info->control |= EESOX_INTR_ENABLE;

	writeb(info->control, info->ctl_port);
}

/* Prototype: void eesoxscsi_irqdisable(ec, irqnr)
 * Purpose  : Disable interrupts on EESOX SCSI card
 * Params   : ec    - expansion card structure
 *          : irqnr - interrupt number
 */
static void
eesoxscsi_irqdisable(struct expansion_card *ec, int irqnr)
{
	struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;

	info->control &= ~EESOX_INTR_ENABLE;

	writeb(info->control, info->ctl_port);
}

static const expansioncard_ops_t eesoxscsi_ops = {
	.irqenable	= eesoxscsi_irqenable,
	.irqdisable	= eesoxscsi_irqdisable,
};

/* Prototype: void eesoxscsi_terminator_ctl(*host, on_off)
 * Purpose  : Turn the EESOX SCSI terminators on or off
 * Params   : host   - card to turn on/off
 *          : on_off - !0 to turn on, 0 to turn off
 */
static void
eesoxscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
{
	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
	unsigned long flags;

	spin_lock_irqsave(host->host_lock, flags);
	if (on_off)
		info->control |= EESOX_TERM_ENABLE;
	else
		info->control &= ~EESOX_TERM_ENABLE;

	writeb(info->control, info->ctl_port);
	spin_unlock_irqrestore(host->host_lock, flags);
}

/* Prototype: void eesoxscsi_intr(irq, *dev_id, *regs)
 * Purpose  : handle interrupts from EESOX SCSI card
 * Params   : irq    - interrupt number
 *	      dev_id - user-defined (Scsi_Host structure)
 */
static irqreturn_t
eesoxscsi_intr(int irq, void *dev_id)
{
	struct eesoxscsi_info *info = dev_id;

	return fas216_intr(&info->info);
}

/* Prototype: fasdmatype_t eesoxscsi_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
eesoxscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
		       fasdmadir_t direction, fasdmatype_t min_type)
{
	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
	struct device *dev = scsi_get_device(host);
	int dmach = info->info.scsi.dma;

	if (dmach != NO_DMA &&
	    (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
		int bufs, map_dir, dma_dir;

		bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);

		if (direction == DMA_OUT)
			map_dir = DMA_TO_DEVICE,
			dma_dir = DMA_MODE_WRITE;
		else
			map_dir = DMA_FROM_DEVICE,
			dma_dir = DMA_MODE_READ;

		dma_map_sg(dev, info->sg, bufs + 1, map_dir);

		disable_dma(dmach);
		set_dma_sg(dmach, info->sg, bufs + 1);
		set_dma_mode(dmach, dma_dir);
		enable_dma(dmach);
		return fasdma_real_all;
	}
	/*
	 * We don't do DMA, we only do slow PIO
	 *
	 * Some day, we will do Pseudo DMA
	 */
	return fasdma_pseudo;
}

static void eesoxscsi_buffer_in(void *buf, int length, void __iomem *base)
{
	const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
	const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
	const void __iomem *reg_dmadata = base + EESOX_DMADATA;
	const register unsigned long mask = 0xffff;

	do {
		unsigned int status;

		/*
		 * Interrupt request?
		 */
		status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
		if (status & STAT_INT)
			break;

		/*
		 * DMA request active?
		 */
		status = readb(reg_dmastat);
		if (!(status & EESOX_STAT_DMA))
			continue;

		/*
		 * Get number of bytes in FIFO
		 */
		status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
		if (status > 16)
			status = 16;
		if (status > length)
			status = length;

		/*
		 * Align buffer.
		 */
		if (((u32)buf) & 2 && status >= 2) {
			*(u16 *)buf = readl(reg_dmadata);
			buf += 2;
			status -= 2;
			length -= 2;
		}

		if (status >= 8) {
			unsigned long l1, l2;

			l1 = readl(reg_dmadata) & mask;
			l1 |= readl(reg_dmadata) << 16;
			l2 = readl(reg_dmadata) & mask;
			l2 |= readl(reg_dmadata) << 16;
			*(u32 *)buf = l1;
			buf += 4;
			*(u32 *)buf = l2;
			buf += 4;
			length -= 8;
			continue;
		}

		if (status >= 4) {
			unsigned long l1;

			l1 = readl(reg_dmadata) & mask;
			l1 |= readl(reg_dmadata) << 16;

			*(u32 *)buf = l1;
			buf += 4;
			length -= 4;
			continue;
		}

		if (status >= 2) {
			*(u16 *)buf = readl(reg_dmadata);
			buf += 2;
			length -= 2;
		}
	} while (length);
}

static void eesoxscsi_buffer_out(void *buf, int length, void __iomem *base)
{
	const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
	const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
	const void __iomem *reg_dmadata = base + EESOX_DMADATA;

	do {
		unsigned int status;

		/*
		 * Interrupt request?
		 */
		status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
		if (status & STAT_INT)
			break;

		/*
		 * DMA request active?
		 */
		status = readb(reg_dmastat);
		if (!(status & EESOX_STAT_DMA))
			continue;

		/*
		 * Get number of bytes in FIFO
		 */
		status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
		if (status > 16)
			status = 16;
		status = 16 - status;
		if (status > length)
			status = length;
		status &= ~1;

		/*
		 * Align buffer.
		 */
		if (((u32)buf) & 2 && status >= 2) {
			writel(*(u16 *)buf << 16, reg_dmadata);
			buf += 2;
			status -= 2;
			length -= 2;
		}

		if (status >= 8) {
			unsigned long l1, l2;

			l1 = *(u32 *)buf;
			buf += 4;
			l2 = *(u32 *)buf;
			buf += 4;

			writel(l1 << 16, reg_dmadata);
			writel(l1, reg_dmadata);
			writel(l2 << 16, reg_dmadata);
			writel(l2, reg_dmadata);
			length -= 8;
			continue;
		}

		if (status >= 4) {
			unsigned long l1;

			l1 = *(u32 *)buf;
			buf += 4;

			writel(l1 << 16, reg_dmadata);
			writel(l1, reg_dmadata);
			length -= 4;
			continue;
		}

		if (status >= 2) {
			writel(*(u16 *)buf << 16, reg_dmadata);
			buf += 2;
			length -= 2;
		}
	} while (length);
}

static void
eesoxscsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
		     fasdmadir_t dir, int transfer_size)
{
	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
	if (dir == DMA_IN) {
		eesoxscsi_buffer_in(SCp->ptr, SCp->this_residual, info->base);
	} else {
		eesoxscsi_buffer_out(SCp->ptr, SCp->this_residual, info->base);
	}
}

/* Prototype: int eesoxscsi_dma_stop(host, SCpnt)
 * Purpose  : stops DMA/PIO
 * Params   : host  - host
 *	      SCpnt - command
 */
static void
eesoxscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
{
	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
	if (info->info.scsi.dma != NO_DMA)
		disable_dma(info->info.scsi.dma);
}

/* Prototype: const char *eesoxscsi_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 *eesoxscsi_info(struct Scsi_Host *host)
{
	struct eesoxscsi_info *info = (struct eesoxscsi_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->control & EESOX_TERM_ENABLE ? "n" : "ff");

	return string;
}

/* Prototype: int eesoxscsi_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
eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
{
	int ret = length;

	if (length >= 9 && strncmp(buffer, "EESOXSCSI", 9) == 0) {
		buffer += 9;
		length -= 9;

		if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
			if (buffer[5] == '1')
				eesoxscsi_terminator_ctl(host, 1);
			else if (buffer[5] == '0')
				eesoxscsi_terminator_ctl(host, 0);
			else
				ret = -EINVAL;
		} else
			ret = -EINVAL;
	} else
		ret = -EINVAL;

	return ret;
}

/* Prototype: int eesoxscsi_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 eesoxscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
			    int length, int inout)
{
	struct eesoxscsi_info *info;
	char *p = buffer;
	int pos;

	if (inout == 1)
		return eesoxscsi_set_proc_info(host, buffer, length);

	info = (struct eesoxscsi_info *)host->hostdata;

	p += sprintf(p, "EESOX SCSI driver v%s\n", VERSION);
	p += fas216_print_host(&info->info, p);
	p += sprintf(p, "Term    : o%s\n",
			info->control & EESOX_TERM_ENABLE ? "n" : "ff");

	p += fas216_print_stats(&info->info, p);
	p += fas216_print_devices(&info->info, p);

	*start = buffer + offset;
	pos = p - buffer - offset;
	if (pos > length)
		pos = length;

	return pos;
}

static ssize_t eesoxscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct expansion_card *ec = ECARD_DEV(dev);
	struct Scsi_Host *host = ecard_get_drvdata(ec);
	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;

	return sprintf(buf, "%d\n", info->control & EESOX_TERM_ENABLE ? 1 : 0);
}

static ssize_t eesoxscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
{
	struct expansion_card *ec = ECARD_DEV(dev);
	struct Scsi_Host *host = ecard_get_drvdata(ec);
	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
	unsigned long flags;

	if (len > 1) {
		spin_lock_irqsave(host->host_lock, flags);
		if (buf[0] != '0') {
			info->control |= EESOX_TERM_ENABLE;
		} else {
			info->control &= ~EESOX_TERM_ENABLE;
		}
		writeb(info->control, info->ctl_port);
		spin_unlock_irqrestore(host->host_lock, flags);
	}

	return len;
}

static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
		   eesoxscsi_show_term, eesoxscsi_store_term);

static struct scsi_host_template eesox_template = {
	.module				= THIS_MODULE,
	.proc_info			= eesoxscsi_proc_info,
	.name				= "EESOX SCSI",
	.info				= eesoxscsi_info,
	.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,
	.can_queue			= 1,
	.this_id			= 7,
	.sg_tablesize			= SG_ALL,
	.cmd_per_lun			= 1,
	.use_clustering			= DISABLE_CLUSTERING,
	.proc_name			= "eesox",
};

static int __devinit
eesoxscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
{
	struct Scsi_Host *host;
	struct eesoxscsi_info *info;
	unsigned long resbase, reslen;
	void __iomem *base;
	int ret;

	ret = ecard_request_resources(ec);
	if (ret)
		goto out;

	resbase = ecard_resource_start(ec, ECARD_RES_IOCFAST);
	reslen = ecard_resource_len(ec, ECARD_RES_IOCFAST);
	base = ioremap(resbase, reslen);
	if (!base) {
		ret = -ENOMEM;
		goto out_region;
	}

	host = scsi_host_alloc(&eesox_template,
			       sizeof(struct eesoxscsi_info));
	if (!host) {
		ret = -ENOMEM;
		goto out_unmap;
	}

	ecard_set_drvdata(ec, host);

	info = (struct eesoxscsi_info *)host->hostdata;
	info->ec	= ec;
	info->base	= base;
	info->ctl_port	= base + EESOX_CONTROL;
	info->control	= term[ec->slot_no] ? EESOX_TERM_ENABLE : 0;
	writeb(info->control, info->ctl_port);

	info->info.scsi.io_base		= base + EESOX_FAS216_OFFSET;
	info->info.scsi.io_shift	= EESOX_FAS216_SHIFT;
	info->info.scsi.irq		= ec->irq;
	info->info.scsi.dma		= ec->dma;
	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_FASTSCSI | CNTL3_FASTCLK;
	info->info.ifcfg.disconnect_ok	= 1;
	info->info.ifcfg.wide_max_size	= 0;
	info->info.ifcfg.capabilities	= FASCAP_PSEUDODMA;
	info->info.dma.setup		= eesoxscsi_dma_setup;
	info->info.dma.pseudo		= eesoxscsi_dma_pseudo;
	info->info.dma.stop		= eesoxscsi_dma_stop;

	ec->irqaddr	= base + EESOX_DMASTAT;
	ec->irqmask	= EESOX_STAT_INTR;
	ec->irq_data	= info;
	ec->ops		= &eesoxscsi_ops;

	device_create_file(&ec->dev, &dev_attr_bus_term);

	ret = fas216_init(host);
	if (ret)
		goto out_free;

	ret = request_irq(ec->irq, eesoxscsi_intr, 0, "eesoxscsi", info);
	if (ret) {
		printk("scsi%d: IRQ%d not free: %d\n",
		       host->host_no, ec->irq, ret);
		goto out_remove;
	}

	if (info->info.scsi.dma != NO_DMA) {
		if (request_dma(info->info.scsi.dma, "eesox")) {
			printk("scsi%d: DMA%d not free, DMA disabled\n",
			       host->host_no, info->info.scsi.dma);
			info->info.scsi.dma = NO_DMA;
		} else {
			set_dma_speed(info->info.scsi.dma, 180);
			info->info.ifcfg.capabilities |= FASCAP_DMA;
			info->info.ifcfg.cntl3 |= CNTL3_BS8;
		}
	}

	ret = fas216_add(host, &ec->dev);
	if (ret == 0)
		goto out;

	if (info->info.scsi.dma != NO_DMA)
		free_dma(info->info.scsi.dma);
	free_irq(ec->irq, host);

 out_remove:
	fas216_remove(host);

 out_free:
	device_remove_file(&ec->dev, &dev_attr_bus_term);
	scsi_host_put(host);

 out_unmap:
	iounmap(base);

 out_region:
	ecard_release_resources(ec);

 out:
	return ret;
}

static void __devexit eesoxscsi_remove(struct expansion_card *ec)
{
	struct Scsi_Host *host = ecard_get_drvdata(ec);
	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;

	ecard_set_drvdata(ec, NULL);
	fas216_remove(host);

	if (info->info.scsi.dma != NO_DMA)
		free_dma(info->info.scsi.dma);
	free_irq(ec->irq, info);

	device_remove_file(&ec->dev, &dev_attr_bus_term);

	iounmap(info->base);

	fas216_release(host);
	scsi_host_put(host);
	ecard_release_resources(ec);
}

static const struct ecard_id eesoxscsi_cids[] = {
	{ MANU_EESOX, PROD_EESOX_SCSI2 },
	{ 0xffff, 0xffff },
};

static struct ecard_driver eesoxscsi_driver = {
	.probe		= eesoxscsi_probe,
	.remove		= __devexit_p(eesoxscsi_remove),
	.id_table	= eesoxscsi_cids,
	.drv = {
		.name		= "eesoxscsi",
	},
};

static int __init eesox_init(void)
{
	return ecard_register_driver(&eesoxscsi_driver);
}

static void __exit eesox_exit(void)
{
	ecard_remove_driver(&eesoxscsi_driver);
}

module_init(eesox_init);
module_exit(eesox_exit);

MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("EESOX 'Fast' SCSI driver for Acorn machines");
module_param_array(term, int, NULL, 0);
MODULE_PARM_DESC(term, "SCSI bus termination");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/acorn/scsi/eesox.c
	3	*
	4	* Copyright (C) 1997-2005 Russell King
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* This driver is based on experimentation. Hence, it may have made
	11	* assumptions about the particular card that I have available, and
	12	* may not be reliable!
	13	*
	14	* Changelog:
	15	* 01-10-1997 RMK Created, READONLY version
	16	* 15-02-1998 RMK READ/WRITE version
	17	* added DMA support and hardware definitions
	18	* 14-03-1998 RMK Updated DMA support
	19	* Added terminator control
	20	* 15-04-1998 RMK Only do PIO if FAS216 will allow it.
	21	* 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
	22	* 02-04-2000 RMK 0.0.3 Fixed NO_IRQ/NO_DMA problem, updated for new
	23	* error handling code.
	24	*/
	25	#include <linux/module.h>
	26	#include <linux/blkdev.h>
	27	#include <linux/kernel.h>
	28	#include <linux/string.h>
	29	#include <linux/ioport.h>
	30	#include <linux/sched.h>
	31	#include <linux/proc_fs.h>
	32	#include <linux/delay.h>
	33	#include <linux/interrupt.h>
	34	#include <linux/init.h>
	35	#include <linux/dma-mapping.h>
	36
	37	#include <asm/io.h>
1da177e4 LT	38	#include <asm/dma.h>
	39	#include <asm/ecard.h>
	40	#include <asm/pgtable.h>
	41
	42	#include "../scsi.h"
	43	#include <scsi/scsi_host.h>
	44	#include "fas216.h"
	45	#include "scsi.h"
	46
	47	#include <scsi/scsicam.h>
	48
	49	#define EESOX_FAS216_OFFSET 0x3000
	50	#define EESOX_FAS216_SHIFT 5
	51
	52	#define EESOX_DMASTAT 0x2800
	53	#define EESOX_STAT_INTR 0x01
	54	#define EESOX_STAT_DMA 0x02
	55
	56	#define EESOX_CONTROL 0x2800
	57	#define EESOX_INTR_ENABLE 0x04
	58	#define EESOX_TERM_ENABLE 0x02
	59	#define EESOX_RESET 0x01
	60
	61	#define EESOX_DMADATA 0x3800
	62
	63	#define VERSION "1.10 (17/01/2003 2.5.59)"
	64
	65	/*
	66	* Use term=0,1,0,0,0 to turn terminators on/off
	67	*/
	68	static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
	69
	70	#define NR_SG 256
	71
	72	struct eesoxscsi_info {
	73	FAS216_Info info;
	74	struct expansion_card *ec;
	75	void __iomem *base;
	76	void __iomem *ctl_port;
	77	unsigned int control;
	78	struct scatterlist sg[NR_SG]; /* Scatter DMA list */
	79	};
	80
	81	/* Prototype: void eesoxscsi_irqenable(ec, irqnr)
	82	* Purpose : Enable interrupts on EESOX SCSI card
	83	* Params : ec - expansion card structure
	84	* : irqnr - interrupt number
	85	*/
	86	static void
	87	eesoxscsi_irqenable(struct expansion_card *ec, int irqnr)
	88	{
	89	struct eesoxscsi_info info = (struct eesoxscsi_info )ec->irq_data;
	90
	91	info->control \|= EESOX_INTR_ENABLE;
	92
	93	writeb(info->control, info->ctl_port);
	94	}
	95
	96	/* Prototype: void eesoxscsi_irqdisable(ec, irqnr)
	97	* Purpose : Disable interrupts on EESOX SCSI card
	98	* Params : ec - expansion card structure
	99	* : irqnr - interrupt number
	100	*/
	101	static void
102	eesoxscsi_irqdisable(struct expansion_card *ec, int irqnr)
103	{
104	struct eesoxscsi_info info = (struct eesoxscsi_info )ec->irq_data;
105
106	info->control &= ~EESOX_INTR_ENABLE;
107
108	writeb(info->control, info->ctl_port);
109	}
110
111	static const expansioncard_ops_t eesoxscsi_ops = {
112	.irqenable = eesoxscsi_irqenable,
113	.irqdisable = eesoxscsi_irqdisable,
114	};
115
116	/* Prototype: void eesoxscsi_terminator_ctl(*host, on_off)
117	* Purpose : Turn the EESOX SCSI terminators on or off
118	* Params : host - card to turn on/off
119	* : on_off - !0 to turn on, 0 to turn off
120	*/
121	static void
122	eesoxscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
123	{
124	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
125	unsigned long flags;
126
127	spin_lock_irqsave(host->host_lock, flags);
128	if (on_off)
129	info->control \|= EESOX_TERM_ENABLE;
130	else
131	info->control &= ~EESOX_TERM_ENABLE;
132
133	writeb(info->control, info->ctl_port);
134	spin_unlock_irqrestore(host->host_lock, flags);
135	}
136
137	/* Prototype: void eesoxscsi_intr(irq, dev_id, regs)
138	* Purpose : handle interrupts from EESOX SCSI card
139	* Params : irq - interrupt number
140	* dev_id - user-defined (Scsi_Host structure)
1da177e4 LT	141	*/
1da177e4 LT	142	static irqreturn_t
7d12e780	143	eesoxscsi_intr(int irq, void *dev_id)
1da177e4 LT	144	{
	145	struct eesoxscsi_info *info = dev_id;
	146
	147	return fas216_intr(&info->info);
	148	}
	149
	150	/* Prototype: fasdmatype_t eesoxscsi_dma_setup(host, SCpnt, direction, min_type)
	151	* Purpose : initialises DMA/PIO
	152	* Params : host - host
	153	* SCpnt - command
	154	* direction - DMA on to/off of card
	155	* min_type - minimum DMA support that we must have for this transfer
	156	* Returns : type of transfer to be performed
	157	*/
	158	static fasdmatype_t
0a04137e	159	eesoxscsi_dma_setup(struct Scsi_Host host, struct scsi_pointer SCp,
1da177e4 LT	160	fasdmadir_t direction, fasdmatype_t min_type)
	161	{
	162	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
	163	struct device *dev = scsi_get_device(host);
	164	int dmach = info->info.scsi.dma;
	165
	166	if (dmach != NO_DMA &&
	167	(min_type == fasdma_real_all \|\| SCp->this_residual >= 512)) {
	168	int bufs, map_dir, dma_dir;
	169
	170	bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
	171
	172	if (direction == DMA_OUT)
	173	map_dir = DMA_TO_DEVICE,
	174	dma_dir = DMA_MODE_WRITE;
	175	else
	176	map_dir = DMA_FROM_DEVICE,
	177	dma_dir = DMA_MODE_READ;
	178
	179	dma_map_sg(dev, info->sg, bufs + 1, map_dir);
	180
	181	disable_dma(dmach);
	182	set_dma_sg(dmach, info->sg, bufs + 1);
	183	set_dma_mode(dmach, dma_dir);
	184	enable_dma(dmach);
	185	return fasdma_real_all;
	186	}
	187	/*
	188	* We don't do DMA, we only do slow PIO
	189	*
	190	* Some day, we will do Pseudo DMA
	191	*/
	192	return fasdma_pseudo;
	193	}
	194
	195	static void eesoxscsi_buffer_in(void buf, int length, void __iomem base)
	196	{
	197	const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
	198	const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
	199	const void __iomem *reg_dmadata = base + EESOX_DMADATA;
	200	const register unsigned long mask = 0xffff;
	201
	202	do {
	203	unsigned int status;
	204
	205	/*
	206	* Interrupt request?
	207	*/
	208	status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
	209	if (status & STAT_INT)
	210	break;
	211
	212	/*
	213	* DMA request active?
	214	*/
	215	status = readb(reg_dmastat);
	216	if (!(status & EESOX_STAT_DMA))
	217	continue;
	218
	219	/*
	220	* Get number of bytes in FIFO
	221	*/
	222	status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
	223	if (status > 16)
224	status = 16;
225	if (status > length)
226	status = length;
227
228	/*
229	* Align buffer.
230	*/
231	if (((u32)buf) & 2 && status >= 2) {
232	(u16 )buf = readl(reg_dmadata);
233	buf += 2;
234	status -= 2;
235	length -= 2;
236	}
237
238	if (status >= 8) {
239	unsigned long l1, l2;
240
241	l1 = readl(reg_dmadata) & mask;
242	l1 \|= readl(reg_dmadata) << 16;
243	l2 = readl(reg_dmadata) & mask;
244	l2 \|= readl(reg_dmadata) << 16;
245	(u32 )buf = l1;
246	buf += 4;
247	(u32 )buf = l2;
248	buf += 4;
249	length -= 8;
250	continue;
251	}
252
253	if (status >= 4) {
254	unsigned long l1;
255
256	l1 = readl(reg_dmadata) & mask;
257	l1 \|= readl(reg_dmadata) << 16;
258
259	(u32 )buf = l1;
260	buf += 4;
261	length -= 4;
262	continue;
263	}
264
265	if (status >= 2) {
266	(u16 )buf = readl(reg_dmadata);
267	buf += 2;
268	length -= 2;
269	}
270	} while (length);
271	}
272
273	static void eesoxscsi_buffer_out(void buf, int length, void __iomem base)
274	{
275	const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
276	const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
277	const void __iomem *reg_dmadata = base + EESOX_DMADATA;
278
279	do {
280	unsigned int status;
281
282	/*
283	* Interrupt request?
284	*/
285	status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
286	if (status & STAT_INT)
287	break;
288
289	/*
290	* DMA request active?
291	*/
292	status = readb(reg_dmastat);
293	if (!(status & EESOX_STAT_DMA))
294	continue;
295
296	/*
297	* Get number of bytes in FIFO
298	*/
299	status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
300	if (status > 16)
301	status = 16;
302	status = 16 - status;
303	if (status > length)
304	status = length;
305	status &= ~1;
306
307	/*
308	* Align buffer.
309	*/
310	if (((u32)buf) & 2 && status >= 2) {
311	writel((u16 )buf << 16, reg_dmadata);
312	buf += 2;
313	status -= 2;
314	length -= 2;
315	}
316
317	if (status >= 8) {
318	unsigned long l1, l2;
319
320	l1 = (u32 )buf;
321	buf += 4;
322	l2 = (u32 )buf;
323	buf += 4;
324
325	writel(l1 << 16, reg_dmadata);
326	writel(l1, reg_dmadata);
327	writel(l2 << 16, reg_dmadata);
328	writel(l2, reg_dmadata);
329	length -= 8;
330	continue;
331	}
332
333	if (status >= 4) {
334	unsigned long l1;
335
336	l1 = (u32 )buf;
337	buf += 4;
338
339	writel(l1 << 16, reg_dmadata);
340	writel(l1, reg_dmadata);
341	length -= 4;
342	continue;
343	}
344
345	if (status >= 2) {
346	writel((u16 )buf << 16, reg_dmadata);
347	buf += 2;
348	length -= 2;
349	}
350	} while (length);
351	}
352
353	static void
0a04137e	354	eesoxscsi_dma_pseudo(struct Scsi_Host host, struct scsi_pointer SCp,
1da177e4 LT	355	fasdmadir_t dir, int transfer_size)
	356	{
	357	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
	358	if (dir == DMA_IN) {
	359	eesoxscsi_buffer_in(SCp->ptr, SCp->this_residual, info->base);
	360	} else {
	361	eesoxscsi_buffer_out(SCp->ptr, SCp->this_residual, info->base);
	362	}
	363	}
	364
	365	/* Prototype: int eesoxscsi_dma_stop(host, SCpnt)
	366	* Purpose : stops DMA/PIO
	367	* Params : host - host
	368	* SCpnt - command
	369	*/
	370	static void
0a04137e	371	eesoxscsi_dma_stop(struct Scsi_Host host, struct scsi_pointer SCp)
1da177e4 LT	372	{
	373	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
	374	if (info->info.scsi.dma != NO_DMA)
	375	disable_dma(info->info.scsi.dma);
	376	}
	377
	378	/* Prototype: const char eesoxscsi_info(struct Scsi_Host host)
	379	* Purpose : returns a descriptive string about this interface,
	380	* Params : host - driver host structure to return info for.
	381	* Returns : pointer to a static buffer containing null terminated string.
	382	*/
	383	const char eesoxscsi_info(struct Scsi_Host host)
	384	{
	385	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
	386	static char string[150];
	387
	388	sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
	389	host->hostt->name, info->info.scsi.type, info->ec->slot_no,
	390	VERSION, info->control & EESOX_TERM_ENABLE ? "n" : "ff");
	391
	392	return string;
	393	}
	394
	395	/* Prototype: int eesoxscsi_set_proc_info(struct Scsi_Host host, char buffer, int length)
	396	* Purpose : Set a driver specific function
	397	* Params : host - host to setup
	398	* : buffer - buffer containing string describing operation
	399	* : length - length of string
	400	* Returns : -EINVAL, or 0
	401	*/
	402	static int
	403	eesoxscsi_set_proc_info(struct Scsi_Host host, char buffer, int length)
	404	{
	405	int ret = length;
	406
	407	if (length >= 9 && strncmp(buffer, "EESOXSCSI", 9) == 0) {
	408	buffer += 9;
	409	length -= 9;
	410
	411	if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
	412	if (buffer[5] == '1')
	413	eesoxscsi_terminator_ctl(host, 1);
	414	else if (buffer[5] == '0')
	415	eesoxscsi_terminator_ctl(host, 0);
	416	else
	417	ret = -EINVAL;
	418	} else
	419	ret = -EINVAL;
	420	} else
	421	ret = -EINVAL;
	422
	423	return ret;
	424	}
	425
	426	/* Prototype: int eesoxscsi_proc_info(char buffer, char *start, off_t offset,
	427	* int length, int host_no, int inout)
	428	* Purpose : Return information about the driver to a user process accessing
	429	* the /proc filesystem.
	430	* Params : buffer - a buffer to write information to
	431	* start - a pointer into this buffer set by this routine to the start
	432	* of the required information.
	433	* offset - offset into information that we have read upto.
	434	* length - length of buffer
	435	* host_no - host number to return information for
436	* inout - 0 for reading, 1 for writing.
437	* Returns : length of data written to buffer.
438	*/
439	int eesoxscsi_proc_info(struct Scsi_Host host, char buffer, char **start, off_t offset,
440	int length, int inout)
441	{
442	struct eesoxscsi_info *info;
443	char *p = buffer;
444	int pos;
445
446	if (inout == 1)
447	return eesoxscsi_set_proc_info(host, buffer, length);
448
449	info = (struct eesoxscsi_info *)host->hostdata;
450
451	p += sprintf(p, "EESOX SCSI driver v%s\n", VERSION);
452	p += fas216_print_host(&info->info, p);
453	p += sprintf(p, "Term : o%s\n",
454	info->control & EESOX_TERM_ENABLE ? "n" : "ff");
455
456	p += fas216_print_stats(&info->info, p);
457	p += fas216_print_devices(&info->info, p);
458
459	*start = buffer + offset;
460	pos = p - buffer - offset;
461	if (pos > length)
462	pos = length;
463
464	return pos;
465	}
466
10523b3b	467	static ssize_t eesoxscsi_show_term(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	468	{
	469	struct expansion_card *ec = ECARD_DEV(dev);
	470	struct Scsi_Host *host = ecard_get_drvdata(ec);
	471	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
	472
	473	return sprintf(buf, "%d\n", info->control & EESOX_TERM_ENABLE ? 1 : 0);
	474	}
	475
10523b3b	476	static ssize_t eesoxscsi_store_term(struct device dev, struct device_attribute attr, const char *buf, size_t len)
1da177e4 LT	477	{
	478	struct expansion_card *ec = ECARD_DEV(dev);
	479	struct Scsi_Host *host = ecard_get_drvdata(ec);
	480	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
	481	unsigned long flags;
	482
	483	if (len > 1) {
	484	spin_lock_irqsave(host->host_lock, flags);
	485	if (buf[0] != '0') {
	486	info->control \|= EESOX_TERM_ENABLE;
	487	} else {
	488	info->control &= ~EESOX_TERM_ENABLE;
	489	}
	490	writeb(info->control, info->ctl_port);
	491	spin_unlock_irqrestore(host->host_lock, flags);
	492	}
	493
	494	return len;
	495	}
	496
	497	static DEVICE_ATTR(bus_term, S_IRUGO \| S_IWUSR,
	498	eesoxscsi_show_term, eesoxscsi_store_term);
	499
d0be4a7d	500	static struct scsi_host_template eesox_template = {
1da177e4 LT	501	.module = THIS_MODULE,
	502	.proc_info = eesoxscsi_proc_info,
	503	.name = "EESOX SCSI",
	504	.info = eesoxscsi_info,
	505	.queuecommand = fas216_queue_command,
	506	.eh_host_reset_handler = fas216_eh_host_reset,
	507	.eh_bus_reset_handler = fas216_eh_bus_reset,
	508	.eh_device_reset_handler = fas216_eh_device_reset,
	509	.eh_abort_handler = fas216_eh_abort,
	510	.can_queue = 1,
	511	.this_id = 7,
	512	.sg_tablesize = SG_ALL,
	513	.cmd_per_lun = 1,
	514	.use_clustering = DISABLE_CLUSTERING,
	515	.proc_name = "eesox",
	516	};
	517
	518	static int __devinit
	519	eesoxscsi_probe(struct expansion_card ec, const struct ecard_id id)
	520	{
	521	struct Scsi_Host *host;
	522	struct eesoxscsi_info *info;
	523	unsigned long resbase, reslen;
	524	void __iomem *base;
	525	int ret;
	526
	527	ret = ecard_request_resources(ec);
	528	if (ret)
	529	goto out;
	530
	531	resbase = ecard_resource_start(ec, ECARD_RES_IOCFAST);
	532	reslen = ecard_resource_len(ec, ECARD_RES_IOCFAST);
	533	base = ioremap(resbase, reslen);
	534	if (!base) {
	535	ret = -ENOMEM;
	536	goto out_region;
	537	}
	538
	539	host = scsi_host_alloc(&eesox_template,
	540	sizeof(struct eesoxscsi_info));
	541	if (!host) {
	542	ret = -ENOMEM;
	543	goto out_unmap;
	544	}
	545
	546	ecard_set_drvdata(ec, host);
	547
	548	info = (struct eesoxscsi_info *)host->hostdata;
	549	info->ec = ec;
	550	info->base = base;
	551	info->ctl_port = base + EESOX_CONTROL;
	552	info->control = term[ec->slot_no] ? EESOX_TERM_ENABLE : 0;
	553	writeb(info->control, info->ctl_port);
	554
	555	info->info.scsi.io_base = base + EESOX_FAS216_OFFSET;
	556	info->info.scsi.io_shift = EESOX_FAS216_SHIFT;
	557	info->info.scsi.irq = ec->irq;
	558	info->info.scsi.dma = ec->dma;
	559	info->info.ifcfg.clockrate = 40; /* MHz */
	560	info->info.ifcfg.select_timeout = 255;
	561	info->info.ifcfg.asyncperiod = 200; /* ns */
	562	info->info.ifcfg.sync_max_depth = 7;
	563	info->info.ifcfg.cntl3 = CNTL3_FASTSCSI \| CNTL3_FASTCLK;
	564	info->info.ifcfg.disconnect_ok = 1;
565	info->info.ifcfg.wide_max_size = 0;
566	info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
567	info->info.dma.setup = eesoxscsi_dma_setup;
568	info->info.dma.pseudo = eesoxscsi_dma_pseudo;
569	info->info.dma.stop = eesoxscsi_dma_stop;
570
571	ec->irqaddr = base + EESOX_DMASTAT;
572	ec->irqmask = EESOX_STAT_INTR;
573	ec->irq_data = info;
574	ec->ops = &eesoxscsi_ops;
575
576	device_create_file(&ec->dev, &dev_attr_bus_term);
577
578	ret = fas216_init(host);
579	if (ret)
580	goto out_free;
581
582	ret = request_irq(ec->irq, eesoxscsi_intr, 0, "eesoxscsi", info);
583	if (ret) {
584	printk("scsi%d: IRQ%d not free: %d\n",
585	host->host_no, ec->irq, ret);
586	goto out_remove;
587	}
588
589	if (info->info.scsi.dma != NO_DMA) {
590	if (request_dma(info->info.scsi.dma, "eesox")) {
591	printk("scsi%d: DMA%d not free, DMA disabled\n",
592	host->host_no, info->info.scsi.dma);
593	info->info.scsi.dma = NO_DMA;
594	} else {
595	set_dma_speed(info->info.scsi.dma, 180);
596	info->info.ifcfg.capabilities \|= FASCAP_DMA;
597	info->info.ifcfg.cntl3 \|= CNTL3_BS8;
598	}
599	}
600
601	ret = fas216_add(host, &ec->dev);
602	if (ret == 0)
603	goto out;
604
605	if (info->info.scsi.dma != NO_DMA)
606	free_dma(info->info.scsi.dma);
607	free_irq(ec->irq, host);
608
609	out_remove:
610	fas216_remove(host);
611
612	out_free:
613	device_remove_file(&ec->dev, &dev_attr_bus_term);
614	scsi_host_put(host);
615
616	out_unmap:
617	iounmap(base);
618
619	out_region:
620	ecard_release_resources(ec);
621
622	out:
623	return ret;
624	}
625
626	static void __devexit eesoxscsi_remove(struct expansion_card *ec)
627	{
628	struct Scsi_Host *host = ecard_get_drvdata(ec);
629	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
630
631	ecard_set_drvdata(ec, NULL);
632	fas216_remove(host);
633
634	if (info->info.scsi.dma != NO_DMA)
635	free_dma(info->info.scsi.dma);
636	free_irq(ec->irq, info);
637
638	device_remove_file(&ec->dev, &dev_attr_bus_term);
639
640	iounmap(info->base);
641
642	fas216_release(host);
643	scsi_host_put(host);
644	ecard_release_resources(ec);
645	}
646
647	static const struct ecard_id eesoxscsi_cids[] = {
648	{ MANU_EESOX, PROD_EESOX_SCSI2 },
649	{ 0xffff, 0xffff },
650	};
651
652	static struct ecard_driver eesoxscsi_driver = {
653	.probe = eesoxscsi_probe,
654	.remove = __devexit_p(eesoxscsi_remove),
655	.id_table = eesoxscsi_cids,
656	.drv = {
657	.name = "eesoxscsi",
658	},
659	};
660
661	static int __init eesox_init(void)
662	{
663	return ecard_register_driver(&eesoxscsi_driver);
664	}
665
666	static void __exit eesox_exit(void)
667	{
668	ecard_remove_driver(&eesoxscsi_driver);
669	}
670
671	module_init(eesox_init);
672	module_exit(eesox_exit);
673
674	MODULE_AUTHOR("Russell King");
675	MODULE_DESCRIPTION("EESOX 'Fast' SCSI driver for Acorn machines");
8d3b33f6	676	module_param_array(term, int, NULL, 0);
1da177e4 LT	677	MODULE_PARM_DESC(term, "SCSI bus termination");
1da177e4 LT	678	MODULE_LICENSE("GPL");