path: root/drivers/scsi/aha1542.c

/*
 *  Driver for Adaptec AHA-1542 SCSI host adapters
 *
 *  Copyright (C) 1992  Tommy Thorn
 *  Copyright (C) 1993, 1994, 1995 Eric Youngdale
 *  Copyright (C) 2015 Ondrej Zary
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/isa.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <asm/dma.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include "aha1542.h"

#define MAXBOARDS 4

static bool isapnp = 1;
module_param(isapnp, bool, 0);
MODULE_PARM_DESC(isapnp, "enable PnP support (default=1)");

static int io[MAXBOARDS] = { 0x330, 0x334, 0, 0 };
module_param_array(io, int, NULL, 0);
MODULE_PARM_DESC(io, "base IO address of controller (0x130,0x134,0x230,0x234,0x330,0x334, default=0x330,0x334)");

/* time AHA spends on the AT-bus during data transfer */
static int bus_on[MAXBOARDS] = { -1, -1, -1, -1 }; /* power-on default: 11us */
module_param_array(bus_on, int, NULL, 0);
MODULE_PARM_DESC(bus_on, "bus on time [us] (2-15, default=-1 [HW default: 11])");

/* time AHA spends off the bus (not to monopolize it) during data transfer  */
static int bus_off[MAXBOARDS] = { -1, -1, -1, -1 }; /* power-on default: 4us */
module_param_array(bus_off, int, NULL, 0);
MODULE_PARM_DESC(bus_off, "bus off time [us] (1-64, default=-1 [HW default: 4])");

/* default is jumper selected (J1 on 1542A), factory default = 5 MB/s */
static int dma_speed[MAXBOARDS] = { -1, -1, -1, -1 };
module_param_array(dma_speed, int, NULL, 0);
MODULE_PARM_DESC(dma_speed, "DMA speed [MB/s] (5,6,7,8,10, default=-1 [by jumper])");

#define BIOS_TRANSLATION_6432 1	/* Default case these days */
#define BIOS_TRANSLATION_25563 2	/* Big disk case */

struct aha1542_hostdata {
	/* This will effectively start both of them at the first mailbox */
	int bios_translation;	/* Mapping bios uses - for compatibility */
	int aha1542_last_mbi_used;
	int aha1542_last_mbo_used;
	struct scsi_cmnd *int_cmds[AHA1542_MAILBOXES];
	struct mailbox mb[2 * AHA1542_MAILBOXES];
	struct ccb ccb[AHA1542_MAILBOXES];
};

static inline void aha1542_intr_reset(u16 base)
{
	outb(IRST, CONTROL(base));
}

static inline bool wait_mask(u16 port, u8 mask, u8 allof, u8 noneof, int timeout)
{
	bool delayed = true;

	if (timeout == 0) {
		timeout = 3000000;
		delayed = false;
	}

	while (1) {
		u8 bits = inb(port) & mask;
		if ((bits & allof) == allof && ((bits & noneof) == 0))
			break;
		if (delayed)
			mdelay(1);
		if (--timeout == 0)
			return false;
	}

	return true;
}

static int aha1542_outb(unsigned int base, u8 val)
{
	if (!wait_mask(STATUS(base), CDF, 0, CDF, 0))
		return 1;
	outb(val, DATA(base));

	return 0;
}

static int aha1542_out(unsigned int base, u8 *buf, int len)
{
	while (len--) {
		if (!wait_mask(STATUS(base), CDF, 0, CDF, 0))
			return 1;
		outb(*buf++, DATA(base));
	}
	if (!wait_mask(INTRFLAGS(base), INTRMASK, HACC, 0, 0))
		return 1;

	return 0;
}

/* Only used at boot time, so we do not need to worry about latency as much
   here */

static int aha1542_in(unsigned int base, u8 *buf, int len, int timeout)
{
	while (len--) {
		if (!wait_mask(STATUS(base), DF, DF, 0, timeout))
			return 1;
		*buf++ = inb(DATA(base));
	}
	return 0;
}

static int makecode(unsigned hosterr, unsigned scsierr)
{
	switch (hosterr) {
	case 0x0:
	case 0xa:		/* Linked command complete without error and linked normally */
	case 0xb:		/* Linked command complete without error, interrupt generated */
		hosterr = 0;
		break;

	case 0x11:		/* Selection time out-The initiator selection or target
				   reselection was not complete within the SCSI Time out period */
		hosterr = DID_TIME_OUT;
		break;

	case 0x12:		/* Data overrun/underrun-The target attempted to transfer more data
				   than was allocated by the Data Length field or the sum of the
				   Scatter / Gather Data Length fields. */

	case 0x13:		/* Unexpected bus free-The target dropped the SCSI BSY at an unexpected time. */

	case 0x15:		/* MBO command was not 00, 01 or 02-The first byte of the CB was
				   invalid. This usually indicates a software failure. */

	case 0x16:		/* Invalid CCB Operation Code-The first byte of the CCB was invalid.
				   This usually indicates a software failure. */

	case 0x17:		/* Linked CCB does not have the same LUN-A subsequent CCB of a set
				   of linked CCB's does not specify the same logical unit number as
				   the first. */
	case 0x18:		/* Invalid Target Direction received from Host-The direction of a
				   Target Mode CCB was invalid. */

	case 0x19:		/* Duplicate CCB Received in Target Mode-More than once CCB was
				   received to service data transfer between the same target LUN
				   and initiator SCSI ID in the same direction. */

	case 0x1a:		/* Invalid CCB or Segment List Parameter-A segment list with a zero
				   length segment or invalid segment list boundaries was received.
				   A CCB parameter was invalid. */
#ifdef DEBUG
		printk