eesox.c

linux-2.6.15.6

/*
 *  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/irq.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)
 *	      regs   - processor registers at interrupt
 */
static irqreturn_t
eesoxscsi_intr(int irq, void *dev_id, struct pt_regs *regs)
{
	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);