eesox.c

arm平台上的uclinux系统全部源代码

/*
 * linux/arch/arm/drivers/scsi/eesox.c
 *
 * Copyright (C) 1997-1998 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.
 */

#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/unistd.h>
#include <linux/stat.h>

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

#include "sd.h"
#include "hosts.h"
#include "eesox.h"

#define NO_IRQ	255
#define NO_DMA	255

/* Configuration */
#define EESOX_XTALFREQ		40
#define EESOX_ASYNC_PERIOD	200
#define EESOX_SYNC_DEPTH	7

/*
 * List of devices that the driver will recognise
 */
#define EESOXSCSI_LIST	{ MANU_EESOX, PROD_EESOX_SCSI2 }

#define EESOX_FAS216_OFFSET	0xc00
#define EESOX_FAS216_SHIFT	3

#define EESOX_STATUS		0xa00
#define EESOX_STAT_INTR		0x01
#define EESOX_STAT_DMA		0x02

#define EESOX_CONTROL		0xa00
#define EESOX_INTR_ENABLE	0x04
#define EESOX_TERM_ENABLE	0x02
#define EESOX_RESET		0x01

#define EESOX_DMA_OFFSET	0xe00

/*
 * Version
 */
#define VER_MAJOR	0
#define VER_MINOR	0
#define VER_PATCH	2

static struct expansion_card *ecs[MAX_ECARDS];

/*
 * Use term=0,1,0,0,0 to turn terminators on/off
 */
int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };

static struct proc_dir_entry proc_scsi_eesox = {
	PROC_SCSI_QLOGICISP, 5, "eesox",
	S_IFDIR | S_IRUGO | S_IXUGO, 2
};

/* 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 control *control = (struct control *)ec->irq_data;

	control->control |= EESOX_INTR_ENABLE;

	outb(control->control, control->io_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 control *control = (struct control *)ec->irq_data;

	control->control &= ~EESOX_INTR_ENABLE;

	outb(control->control, control->io_port);
}

static const expansioncard_ops_t eesoxscsi_ops = {
	eesoxscsi_irqenable,
	eesoxscsi_irqdisable,
	NULL,
	NULL,
	NULL,
	NULL
};

/* 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)
{
	EESOXScsi_Info *info = (EESOXScsi_Info *)host->hostdata;
	unsigned long flags;

	save_flags_cli(flags);
	if (on_off)
		info->control.control |= EESOX_TERM_ENABLE;
	else
		info->control.control &= ~EESOX_TERM_ENABLE;
	restore_flags(flags);

	outb(info->control.control, info->control.io_port);
}

/* 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 void
eesoxscsi_intr(int irq, void *dev_id, struct pt_regs *regs)
{
	struct Scsi_Host *host = (struct Scsi_Host *)dev_id;

	fas216_intr(host);
}

static void
eesoxscsi_invalidate(char *addr, long len, fasdmadir_t direction)
{
	unsigned int page;

	if (direction == DMA_OUT) {
		for(page = (unsigned int) addr; len > 0;
		     page += PAGE_SIZE, len -= PAGE_SIZE)
			flush_page_to_ram(page);
	} else
		flush_cache_range(current->mm, (unsigned long)addr,
				  (unsigned long)addr + len);
}

/* 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, Scsi_Pointer *SCp,
		       fasdmadir_t direction, fasdmatype_t min_type)
{
	EESOXScsi_Info *info = (EESOXScsi_Info *)host->hostdata;
	int dmach = host->dma_channel;

	if (dmach != NO_DMA &&
	    (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
		int buf;

		for(buf = 1; buf <= SCp->buffers_residual &&
			     buf < NR_SG; buf++) {
			info->dmasg[buf].address = __virt_to_bus(
				(unsigned long)SCp->buffer[buf].address);
			info->dmasg[buf].length = SCp->buffer[buf].length;

			eesoxscsi_invalidate(SCp->buffer[buf].address,
						SCp->buffer[buf].length,
						direction);
		}

		info->dmasg[0].address = __virt_to_phys((unsigned long)SCp->ptr);
		info->dmasg[0].length = SCp->this_residual;
		eesoxscsi_invalidate(SCp->ptr,
					SCp->this_residual, direction);

		disable_dma(dmach);
		set_dma_sg(dmach, info->dmasg, buf);
		set_dma_mode(dmach,
			     direction == DMA_OUT ? DMA_MODE_WRITE :
						    DMA_MODE_READ);
		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_dma_pseudo(struct Scsi_Host *host, Scsi_Pointer *SCp,
		     fasdmadir_t dir, int transfer_size)
{
	EESOXScsi_Info *info = (EESOXScsi_Info *)host->hostdata;
	unsigned int status;
	unsigned int length = SCp->this_residual;
	union {
		unsigned char *c;
		unsigned short *s;
		unsigned long *l;
	} buffer;

	buffer.c = SCp->ptr;

	status = inb(host->io_port + EESOX_STATUS);
	if (dir == DMA_IN) {
		while (length > 8) {
			if (status & EESOX_STAT_DMA) {
				unsigned long l1, l2;

				l1 = inw(info->dmaarea);
				l1 |= inw(info->dmaarea) << 16;
				l2 = inw(info->dmaarea);
				l2 |= inw(info->dmaarea) << 16;
				*buffer.l++ = l1;
				*buffer.l++ = l2;
				length -= 8;
			} else if (status & EESOX_STAT_INTR)
				goto end;
			status = inb(host->io_port + EESOX_STATUS);
		}

		while (length > 1) {
			if (status & EESOX_STAT_DMA) {
				*buffer.s++ = inw(info->dmaarea);
				length -= 2;
			} else if (status & EESOX_STAT_INTR)
				goto end;
			status = inb(host->io_port + EESOX_STATUS);
		}

		while (length > 0) {
			if (status & EESOX_STAT_DMA) {
				*buffer.c++ = inw(info->dmaarea);
				length -= 1;
			} else if (status & EESOX_STAT_INTR)
				goto end;
			status = inb(host->io_port + EESOX_STATUS);
		}
	} else {
		while (length > 8) {
			if (status & EESOX_STAT_DMA) {
				unsigned long l1, l2;

				l1 = *buffer.l++;
				l2 = *buffer.l++;

				outw(l1, info->dmaarea);
				outw(l1 >> 16, info->dmaarea);
				outw(l2, info->dmaarea);
				outw(l2 >> 16, info->dmaarea);
				length -= 8;
			} else if (status & EESOX_STAT_INTR)
				goto end;
			status = inb(host->io_port + EESOX_STATUS);
		}

		while (length > 1) {
			if (status & EESOX_STAT_DMA) {
				outw(*buffer.s++, info->dmaarea);
				length -= 2;
			} else if (status & EESOX_STAT_INTR)
				goto end;