[mirror_ubuntu-jammy-kernel.git] / drivers / scsi / arm / eesox.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/drivers/acorn/scsi/eesox.c
 *
 *  Copyright (C) 1997-2005 Russell King
 *
 *  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/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, map_dir);

		disable_dma(dmach);
		set_dma_sg(dmach, info->sg, bufs);
		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;
	register const 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;
	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;
}

static int eesoxscsi_show_info(struct seq_file *m, struct Scsi_Host *host)
{
	struct eesoxscsi_info *info;

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

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

	fas216_print_stats(&info->info, m);
	fas216_print_devices(&info->info, m);
	return 0;
}

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,
	.show_info			= eesoxscsi_show_info,
	.write_info			= eesoxscsi_set_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_MAX_SEGMENTS,
	.dma_boundary			= IOMD_DMA_BOUNDARY,
	.proc_name			= "eesox",
};

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

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

	base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
	if (!base) {
		ret = -ENOMEM;
		goto out_region;
	}

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

	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;

	ecard_setirq(ec, &eesoxscsi_ops, info);

	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_region:
	ecard_release_resources(ec);

 out:
	return ret;
}

static void 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);

	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		= 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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* linux/drivers/acorn/scsi/eesox.c
	4	*
	5	* Copyright (C) 1997-2005 Russell King
	6	*
1da177e4 LT	7	* This driver is based on experimentation. Hence, it may have made
	8	* assumptions about the particular card that I have available, and
	9	* may not be reliable!
	10	*
	11	* Changelog:
	12	* 01-10-1997 RMK Created, READONLY version
	13	* 15-02-1998 RMK READ/WRITE version
	14	* added DMA support and hardware definitions
	15	* 14-03-1998 RMK Updated DMA support
	16	* Added terminator control
	17	* 15-04-1998 RMK Only do PIO if FAS216 will allow it.
	18	* 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
	19	* 02-04-2000 RMK 0.0.3 Fixed NO_IRQ/NO_DMA problem, updated for new
	20	* error handling code.
	21	*/
	22	#include <linux/module.h>
	23	#include <linux/blkdev.h>
	24	#include <linux/kernel.h>
	25	#include <linux/string.h>
	26	#include <linux/ioport.h>
1da177e4 LT	27	#include <linux/proc_fs.h>
	28	#include <linux/delay.h>
	29	#include <linux/interrupt.h>
	30	#include <linux/init.h>
	31	#include <linux/dma-mapping.h>
	32
	33	#include <asm/io.h>
1da177e4 LT	34	#include <asm/dma.h>
	35	#include <asm/ecard.h>
	36	#include <asm/pgtable.h>
	37
	38	#include "../scsi.h"
	39	#include <scsi/scsi_host.h>
	40	#include "fas216.h"
	41	#include "scsi.h"
	42
	43	#include <scsi/scsicam.h>
	44
	45	#define EESOX_FAS216_OFFSET 0x3000
	46	#define EESOX_FAS216_SHIFT 5
	47
	48	#define EESOX_DMASTAT 0x2800
	49	#define EESOX_STAT_INTR 0x01
	50	#define EESOX_STAT_DMA 0x02
	51
	52	#define EESOX_CONTROL 0x2800
	53	#define EESOX_INTR_ENABLE 0x04
	54	#define EESOX_TERM_ENABLE 0x02
	55	#define EESOX_RESET 0x01
	56
	57	#define EESOX_DMADATA 0x3800
	58
	59	#define VERSION "1.10 (17/01/2003 2.5.59)"
	60
	61	/*
	62	* Use term=0,1,0,0,0 to turn terminators on/off
	63	*/
	64	static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
	65
	66	#define NR_SG 256
	67
	68	struct eesoxscsi_info {
	69	FAS216_Info info;
	70	struct expansion_card *ec;
	71	void __iomem *base;
	72	void __iomem *ctl_port;
	73	unsigned int control;
	74	struct scatterlist sg[NR_SG]; /* Scatter DMA list */
	75	};
	76
	77	/* Prototype: void eesoxscsi_irqenable(ec, irqnr)
	78	* Purpose : Enable interrupts on EESOX SCSI card
	79	* Params : ec - expansion card structure
	80	* : irqnr - interrupt number
	81	*/
	82	static void
	83	eesoxscsi_irqenable(struct expansion_card *ec, int irqnr)
	84	{
	85	struct eesoxscsi_info info = (struct eesoxscsi_info )ec->irq_data;
	86
	87	info->control \|= EESOX_INTR_ENABLE;
	88
	89	writeb(info->control, info->ctl_port);
	90	}
	91
	92	/* Prototype: void eesoxscsi_irqdisable(ec, irqnr)
	93	* Purpose : Disable interrupts on EESOX SCSI card
	94	* Params : ec - expansion card structure
	95	* : irqnr - interrupt number
	96	*/
	97	static void
98	eesoxscsi_irqdisable(struct expansion_card *ec, int irqnr)
99	{
100	struct eesoxscsi_info info = (struct eesoxscsi_info )ec->irq_data;
101
102	info->control &= ~EESOX_INTR_ENABLE;
103
104	writeb(info->control, info->ctl_port);
105	}
106
107	static const expansioncard_ops_t eesoxscsi_ops = {
108	.irqenable = eesoxscsi_irqenable,
109	.irqdisable = eesoxscsi_irqdisable,
110	};
111
112	/* Prototype: void eesoxscsi_terminator_ctl(*host, on_off)
113	* Purpose : Turn the EESOX SCSI terminators on or off
114	* Params : host - card to turn on/off
115	* : on_off - !0 to turn on, 0 to turn off
116	*/
117	static void
118	eesoxscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
119	{
120	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
121	unsigned long flags;
122
123	spin_lock_irqsave(host->host_lock, flags);
124	if (on_off)
125	info->control \|= EESOX_TERM_ENABLE;
126	else
127	info->control &= ~EESOX_TERM_ENABLE;
128
129	writeb(info->control, info->ctl_port);
130	spin_unlock_irqrestore(host->host_lock, flags);
131	}
132
133	/* Prototype: void eesoxscsi_intr(irq, dev_id, regs)
134	* Purpose : handle interrupts from EESOX SCSI card
135	* Params : irq - interrupt number
136	* dev_id - user-defined (Scsi_Host structure)
1da177e4 LT	137	*/
1da177e4 LT	138	static irqreturn_t
7d12e780	139	eesoxscsi_intr(int irq, void *dev_id)
1da177e4 LT	140	{
	141	struct eesoxscsi_info *info = dev_id;
	142
	143	return fas216_intr(&info->info);
	144	}
	145
	146	/* Prototype: fasdmatype_t eesoxscsi_dma_setup(host, SCpnt, direction, min_type)
	147	* Purpose : initialises DMA/PIO
	148	* Params : host - host
	149	* SCpnt - command
	150	* direction - DMA on to/off of card
	151	* min_type - minimum DMA support that we must have for this transfer
	152	* Returns : type of transfer to be performed
	153	*/
	154	static fasdmatype_t
0a04137e	155	eesoxscsi_dma_setup(struct Scsi_Host host, struct scsi_pointer SCp,
1da177e4 LT	156	fasdmadir_t direction, fasdmatype_t min_type)
	157	{
	158	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
	159	struct device *dev = scsi_get_device(host);
	160	int dmach = info->info.scsi.dma;
	161
	162	if (dmach != NO_DMA &&
	163	(min_type == fasdma_real_all \|\| SCp->this_residual >= 512)) {
	164	int bufs, map_dir, dma_dir;
	165
	166	bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
	167
	168	if (direction == DMA_OUT)
	169	map_dir = DMA_TO_DEVICE,
	170	dma_dir = DMA_MODE_WRITE;
	171	else
	172	map_dir = DMA_FROM_DEVICE,
	173	dma_dir = DMA_MODE_READ;
	174
23d046f4	175	dma_map_sg(dev, info->sg, bufs, map_dir);
1da177e4 LT	176
1da177e4 LT	177	disable_dma(dmach);
23d046f4	178	set_dma_sg(dmach, info->sg, bufs);
1da177e4 LT	179	set_dma_mode(dmach, dma_dir);
	180	enable_dma(dmach);
	181	return fasdma_real_all;
	182	}
	183	/*
	184	* We don't do DMA, we only do slow PIO
	185	*
	186	* Some day, we will do Pseudo DMA
	187	*/
	188	return fasdma_pseudo;
	189	}
	190
	191	static void eesoxscsi_buffer_in(void buf, int length, void __iomem base)
	192	{
	193	const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
	194	const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
	195	const void __iomem *reg_dmadata = base + EESOX_DMADATA;
c5a69d57	196	register const unsigned long mask = 0xffff;
1da177e4 LT	197
	198	do {
	199	unsigned int status;
	200
	201	/*
	202	* Interrupt request?
	203	*/
	204	status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
	205	if (status & STAT_INT)
	206	break;
	207
	208	/*
	209	* DMA request active?
	210	*/
	211	status = readb(reg_dmastat);
	212	if (!(status & EESOX_STAT_DMA))
	213	continue;
	214
	215	/*
	216	* Get number of bytes in FIFO
	217	*/
	218	status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
	219	if (status > 16)
	220	status = 16;
	221	if (status > length)
	222	status = length;
	223
	224	/*
	225	* Align buffer.
	226	*/
	227	if (((u32)buf) & 2 && status >= 2) {
	228	(u16 )buf = readl(reg_dmadata);
	229	buf += 2;
	230	status -= 2;
	231	length -= 2;
	232	}
	233
	234	if (status >= 8) {
	235	unsigned long l1, l2;
	236
	237	l1 = readl(reg_dmadata) & mask;
	238	l1 \|= readl(reg_dmadata) << 16;
	239	l2 = readl(reg_dmadata) & mask;
	240	l2 \|= readl(reg_dmadata) << 16;
	241	(u32 )buf = l1;
	242	buf += 4;
	243	(u32 )buf = l2;
	244	buf += 4;
	245	length -= 8;
	246	continue;
	247	}
	248
	249	if (status >= 4) {
	250	unsigned long l1;
	251
	252	l1 = readl(reg_dmadata) & mask;
	253	l1 \|= readl(reg_dmadata) << 16;
	254
	255	(u32 )buf = l1;
	256	buf += 4;
	257	length -= 4;
	258	continue;
	259	}
	260
261	if (status >= 2) {
262	(u16 )buf = readl(reg_dmadata);
263	buf += 2;
264	length -= 2;
265	}
266	} while (length);
267	}
268
269	static void eesoxscsi_buffer_out(void buf, int length, void __iomem base)
270	{
271	const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
272	const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
f39f7b7d	273	void __iomem *reg_dmadata = base + EESOX_DMADATA;
1da177e4 LT	274
	275	do {
	276	unsigned int status;
	277
	278	/*
	279	* Interrupt request?
	280	*/
	281	status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
	282	if (status & STAT_INT)
	283	break;
	284
	285	/*
	286	* DMA request active?
	287	*/
	288	status = readb(reg_dmastat);
	289	if (!(status & EESOX_STAT_DMA))
	290	continue;
	291
	292	/*
	293	* Get number of bytes in FIFO
	294	*/
	295	status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
	296	if (status > 16)
	297	status = 16;
	298	status = 16 - status;
	299	if (status > length)
	300	status = length;
	301	status &= ~1;
	302
	303	/*
	304	* Align buffer.
	305	*/
	306	if (((u32)buf) & 2 && status >= 2) {
	307	writel((u16 )buf << 16, reg_dmadata);
	308	buf += 2;
	309	status -= 2;
	310	length -= 2;
	311	}
	312
	313	if (status >= 8) {
	314	unsigned long l1, l2;
	315
	316	l1 = (u32 )buf;
	317	buf += 4;
	318	l2 = (u32 )buf;
	319	buf += 4;
	320
	321	writel(l1 << 16, reg_dmadata);
	322	writel(l1, reg_dmadata);
	323	writel(l2 << 16, reg_dmadata);
	324	writel(l2, reg_dmadata);
	325	length -= 8;
	326	continue;
	327	}
	328
	329	if (status >= 4) {
	330	unsigned long l1;
	331
	332	l1 = (u32 )buf;
	333	buf += 4;
	334
	335	writel(l1 << 16, reg_dmadata);
	336	writel(l1, reg_dmadata);
	337	length -= 4;
338	continue;
339	}
340
341	if (status >= 2) {
342	writel((u16 )buf << 16, reg_dmadata);
343	buf += 2;
344	length -= 2;
345	}
346	} while (length);
347	}
348
349	static void
0a04137e	350	eesoxscsi_dma_pseudo(struct Scsi_Host host, struct scsi_pointer SCp,
1da177e4 LT	351	fasdmadir_t dir, int transfer_size)
	352	{
	353	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
	354	if (dir == DMA_IN) {
	355	eesoxscsi_buffer_in(SCp->ptr, SCp->this_residual, info->base);
	356	} else {
	357	eesoxscsi_buffer_out(SCp->ptr, SCp->this_residual, info->base);
	358	}
	359	}
	360
	361	/* Prototype: int eesoxscsi_dma_stop(host, SCpnt)
	362	* Purpose : stops DMA/PIO
	363	* Params : host - host
	364	* SCpnt - command
	365	*/
	366	static void
0a04137e	367	eesoxscsi_dma_stop(struct Scsi_Host host, struct scsi_pointer SCp)
1da177e4 LT	368	{
	369	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
	370	if (info->info.scsi.dma != NO_DMA)
	371	disable_dma(info->info.scsi.dma);
	372	}
	373
	374	/* Prototype: const char eesoxscsi_info(struct Scsi_Host host)
	375	* Purpose : returns a descriptive string about this interface,
	376	* Params : host - driver host structure to return info for.
	377	* Returns : pointer to a static buffer containing null terminated string.
	378	*/
	379	const char eesoxscsi_info(struct Scsi_Host host)
	380	{
	381	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
	382	static char string[150];
	383
	384	sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
	385	host->hostt->name, info->info.scsi.type, info->ec->slot_no,
	386	VERSION, info->control & EESOX_TERM_ENABLE ? "n" : "ff");
	387
	388	return string;
	389	}
	390
	391	/* Prototype: int eesoxscsi_set_proc_info(struct Scsi_Host host, char buffer, int length)
	392	* Purpose : Set a driver specific function
	393	* Params : host - host to setup
	394	* : buffer - buffer containing string describing operation
	395	* : length - length of string
	396	* Returns : -EINVAL, or 0
	397	*/
	398	static int
	399	eesoxscsi_set_proc_info(struct Scsi_Host host, char buffer, int length)
	400	{
	401	int ret = length;
	402
	403	if (length >= 9 && strncmp(buffer, "EESOXSCSI", 9) == 0) {
	404	buffer += 9;
	405	length -= 9;
	406
	407	if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
	408	if (buffer[5] == '1')
	409	eesoxscsi_terminator_ctl(host, 1);
	410	else if (buffer[5] == '0')
	411	eesoxscsi_terminator_ctl(host, 0);
	412	else
	413	ret = -EINVAL;
	414	} else
	415	ret = -EINVAL;
	416	} else
	417	ret = -EINVAL;
	418
	419	return ret;
	420	}
	421
9d4e5c54	422	static int eesoxscsi_show_info(struct seq_file m, struct Scsi_Host host)
1da177e4 LT	423	{
1da177e4 LT	424	struct eesoxscsi_info *info;
1da177e4 LT	425
	426	info = (struct eesoxscsi_info *)host->hostdata;
	427
9d4e5c54 AV	428	seq_printf(m, "EESOX SCSI driver v%s\n", VERSION);
	429	fas216_print_host(&info->info, m);
	430	seq_printf(m, "Term : o%s\n",
1da177e4 LT	431	info->control & EESOX_TERM_ENABLE ? "n" : "ff");
1da177e4 LT	432
9d4e5c54 AV	433	fas216_print_stats(&info->info, m);
	434	fas216_print_devices(&info->info, m);
	435	return 0;
1da177e4 LT	436	}
1da177e4 LT	437
10523b3b	438	static ssize_t eesoxscsi_show_term(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	439	{
	440	struct expansion_card *ec = ECARD_DEV(dev);
	441	struct Scsi_Host *host = ecard_get_drvdata(ec);
	442	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
	443
	444	return sprintf(buf, "%d\n", info->control & EESOX_TERM_ENABLE ? 1 : 0);
	445	}
	446
10523b3b	447	static ssize_t eesoxscsi_store_term(struct device dev, struct device_attribute attr, const char *buf, size_t len)
1da177e4 LT	448	{
	449	struct expansion_card *ec = ECARD_DEV(dev);
	450	struct Scsi_Host *host = ecard_get_drvdata(ec);
	451	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
	452	unsigned long flags;
	453
	454	if (len > 1) {
	455	spin_lock_irqsave(host->host_lock, flags);
	456	if (buf[0] != '0') {
	457	info->control \|= EESOX_TERM_ENABLE;
	458	} else {
	459	info->control &= ~EESOX_TERM_ENABLE;
	460	}
	461	writeb(info->control, info->ctl_port);
	462	spin_unlock_irqrestore(host->host_lock, flags);
	463	}
	464
	465	return len;
	466	}
	467
	468	static DEVICE_ATTR(bus_term, S_IRUGO \| S_IWUSR,
	469	eesoxscsi_show_term, eesoxscsi_store_term);
	470
d0be4a7d	471	static struct scsi_host_template eesox_template = {
1da177e4	472	.module = THIS_MODULE,
9d4e5c54 AV	473	.show_info = eesoxscsi_show_info,
9d4e5c54 AV	474	.write_info = eesoxscsi_set_proc_info,
1da177e4 LT	475	.name = "EESOX SCSI",
	476	.info = eesoxscsi_info,
	477	.queuecommand = fas216_queue_command,
	478	.eh_host_reset_handler = fas216_eh_host_reset,
	479	.eh_bus_reset_handler = fas216_eh_bus_reset,
	480	.eh_device_reset_handler = fas216_eh_device_reset,
	481	.eh_abort_handler = fas216_eh_abort,
	482	.can_queue = 1,
	483	.this_id = 7,
65e8617f	484	.sg_tablesize = SG_MAX_SEGMENTS,
5369bea7	485	.dma_boundary = IOMD_DMA_BOUNDARY,
1da177e4 LT	486	.proc_name = "eesox",
	487	};
	488
6f039790	489	static int eesoxscsi_probe(struct expansion_card ec, const struct ecard_id id)
1da177e4 LT	490	{
	491	struct Scsi_Host *host;
	492	struct eesoxscsi_info *info;
1da177e4 LT	493	void __iomem *base;
	494	int ret;
	495
	496	ret = ecard_request_resources(ec);
	497	if (ret)
	498	goto out;
	499
10bdaaa0	500	base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
1da177e4 LT	501	if (!base) {
	502	ret = -ENOMEM;
	503	goto out_region;
	504	}
	505
	506	host = scsi_host_alloc(&eesox_template,
	507	sizeof(struct eesoxscsi_info));
	508	if (!host) {
	509	ret = -ENOMEM;
10bdaaa0	510	goto out_region;
1da177e4 LT	511	}
	512
	513	ecard_set_drvdata(ec, host);
	514
	515	info = (struct eesoxscsi_info *)host->hostdata;
	516	info->ec = ec;
	517	info->base = base;
	518	info->ctl_port = base + EESOX_CONTROL;
	519	info->control = term[ec->slot_no] ? EESOX_TERM_ENABLE : 0;
	520	writeb(info->control, info->ctl_port);
	521
	522	info->info.scsi.io_base = base + EESOX_FAS216_OFFSET;
	523	info->info.scsi.io_shift = EESOX_FAS216_SHIFT;
	524	info->info.scsi.irq = ec->irq;
	525	info->info.scsi.dma = ec->dma;
	526	info->info.ifcfg.clockrate = 40; /* MHz */
	527	info->info.ifcfg.select_timeout = 255;
	528	info->info.ifcfg.asyncperiod = 200; /* ns */
	529	info->info.ifcfg.sync_max_depth = 7;
	530	info->info.ifcfg.cntl3 = CNTL3_FASTSCSI \| CNTL3_FASTCLK;
	531	info->info.ifcfg.disconnect_ok = 1;
	532	info->info.ifcfg.wide_max_size = 0;
	533	info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
	534	info->info.dma.setup = eesoxscsi_dma_setup;
	535	info->info.dma.pseudo = eesoxscsi_dma_pseudo;
	536	info->info.dma.stop = eesoxscsi_dma_stop;
	537
	538	ec->irqaddr = base + EESOX_DMASTAT;
	539	ec->irqmask = EESOX_STAT_INTR;
c7b87f3d RK	540
c7b87f3d RK	541	ecard_setirq(ec, &eesoxscsi_ops, info);
1da177e4 LT	542
	543	device_create_file(&ec->dev, &dev_attr_bus_term);
	544
	545	ret = fas216_init(host);
	546	if (ret)
	547	goto out_free;
	548
	549	ret = request_irq(ec->irq, eesoxscsi_intr, 0, "eesoxscsi", info);
	550	if (ret) {
	551	printk("scsi%d: IRQ%d not free: %d\n",
	552	host->host_no, ec->irq, ret);
	553	goto out_remove;
	554	}
	555
	556	if (info->info.scsi.dma != NO_DMA) {
	557	if (request_dma(info->info.scsi.dma, "eesox")) {
	558	printk("scsi%d: DMA%d not free, DMA disabled\n",
	559	host->host_no, info->info.scsi.dma);
	560	info->info.scsi.dma = NO_DMA;
	561	} else {
	562	set_dma_speed(info->info.scsi.dma, 180);
	563	info->info.ifcfg.capabilities \|= FASCAP_DMA;
	564	info->info.ifcfg.cntl3 \|= CNTL3_BS8;
	565	}
	566	}
	567
	568	ret = fas216_add(host, &ec->dev);
	569	if (ret == 0)
	570	goto out;
	571
	572	if (info->info.scsi.dma != NO_DMA)
	573	free_dma(info->info.scsi.dma);
	574	free_irq(ec->irq, host);
	575
	576	out_remove:
	577	fas216_remove(host);
	578
	579	out_free:
	580	device_remove_file(&ec->dev, &dev_attr_bus_term);
	581	scsi_host_put(host);
	582
1da177e4 LT	583	out_region:
	584	ecard_release_resources(ec);
	585
	586	out:
	587	return ret;
	588	}
	589
6f039790	590	static void eesoxscsi_remove(struct expansion_card *ec)
1da177e4 LT	591	{
	592	struct Scsi_Host *host = ecard_get_drvdata(ec);
	593	struct eesoxscsi_info info = (struct eesoxscsi_info )host->hostdata;
	594
	595	ecard_set_drvdata(ec, NULL);
	596	fas216_remove(host);
	597
	598	if (info->info.scsi.dma != NO_DMA)
	599	free_dma(info->info.scsi.dma);
	600	free_irq(ec->irq, info);
	601
	602	device_remove_file(&ec->dev, &dev_attr_bus_term);
	603
1da177e4 LT	604	fas216_release(host);
	605	scsi_host_put(host);
	606	ecard_release_resources(ec);
	607	}
	608
	609	static const struct ecard_id eesoxscsi_cids[] = {
	610	{ MANU_EESOX, PROD_EESOX_SCSI2 },
	611	{ 0xffff, 0xffff },
	612	};
	613
	614	static struct ecard_driver eesoxscsi_driver = {
	615	.probe = eesoxscsi_probe,
6f039790	616	.remove = eesoxscsi_remove,
1da177e4 LT	617	.id_table = eesoxscsi_cids,
	618	.drv = {
	619	.name = "eesoxscsi",
	620	},
	621	};
	622
	623	static int __init eesox_init(void)
	624	{
	625	return ecard_register_driver(&eesoxscsi_driver);
	626	}
	627
	628	static void __exit eesox_exit(void)
	629	{
	630	ecard_remove_driver(&eesoxscsi_driver);
	631	}
	632
	633	module_init(eesox_init);
	634	module_exit(eesox_exit);
	635
	636	MODULE_AUTHOR("Russell King");
	637	MODULE_DESCRIPTION("EESOX 'Fast' SCSI driver for Acorn machines");
8d3b33f6	638	module_param_array(term, int, NULL, 0);
1da177e4 LT	639	MODULE_PARM_DESC(term, "SCSI bus termination");
1da177e4 LT	640	MODULE_LICENSE("GPL");