/*======================================================================

    A driver for Future Domain-compatible PCMCIA SCSI cards

    fdomain_cs.c 1.35 1999/07/30 03:49:13

    The contents of this file are subject to the Mozilla Public
    License Version 1.1 (the "License"); you may not use this file
    except in compliance with the License. You may obtain a copy of
    the License at http://www.mozilla.org/MPL/

    Software distributed under the License is distributed on an "AS
    IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
    implied. See the License for the specific language governing
    rights and limitations under the License.

    The initial developer of the original code is David A. Hinds
    <dhinds@hyper.stanford.edu>.  Portions created by David A. Hinds
    are Copyright (C) 1998 David A. Hinds.  All Rights Reserved.
    
======================================================================*/

#include <pcmcia/config.h>
#include <pcmcia/k_compat.h>

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/malloc.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/ioport.h>
#include <scsi/scsi.h>
#include <linux/major.h>
#include <linux/blk.h>

#include "drivers/scsi/scsi.h"
#include "drivers/scsi/hosts.h"
#include <scsi/scsi_ioctl.h>
#include "drivers/scsi/fdomain.h"

#include <pcmcia/version.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/ds.h>

#ifdef PCMCIA_DEBUG
static int pc_debug = PCMCIA_DEBUG;
MODULE_PARM(pc_debug, "i");
#define DEBUG(n, args...) if (pc_debug>(n)) printk(KERN_DEBUG args)
static char *version =
"fdomain_cs.c 1.35 1999/07/30 03:49:13 (David Hinds)";
#else
#define DEBUG(n, args...)
#endif

/*====================================================================*/

/* Parameters that can be set with 'insmod' */

/* Bit map of interrupts to choose from */
static u_int irq_mask = 0xdeb8;
static int irq_list[4] = { -1 };

MODULE_PARM(irq_mask, "i");
MODULE_PARM(irq_list, "1-4i");

/*====================================================================*/

typedef struct scsi_info_t {
    int		ndev;
    dev_node_t	node[8];
} scsi_info_t;

extern void fdomain_setup(char *str, int *ints);

static void fdomain_release(u_long arg);
static int fdomain_event(event_t event, int priority,
			event_callback_args_t *args);

static dev_link_t *fdomain_attach(void);
static void fdomain_detach(dev_link_t *);

static Scsi_Host_Template driver_template = FDOMAIN_16X0;

static dev_link_t *dev_list = NULL;

static dev_info_t dev_info = "fdomain_cs";

/*====================================================================*/

static void cs_error(client_handle_t handle, int func, int ret)
{
    error_info_t err = { func, ret };
    CardServices(ReportError, handle, &err);
}

/*====================================================================*/

static dev_link_t *fdomain_attach(void)
{
    client_reg_t client_reg;
    dev_link_t *link;
    int i, ret;
    
    DEBUG(0, "fdomain_attach()\n");

    /* Create new SCSI device */
    link = kmalloc(sizeof(struct dev_link_t), GFP_KERNEL);
    memset(link, 0, sizeof(struct dev_link_t));
    link->priv = kmalloc(sizeof(struct scsi_info_t), GFP_KERNEL);
    memset(link->priv, 0, sizeof(struct scsi_info_t));
    link->release.function = &fdomain_release;
    link->release.data = (u_long)link;

    link->io.NumPorts1 = 0x10;
    link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
    link->io.IOAddrLines = 10;
    link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
    link->irq.IRQInfo1 = IRQ_INFO2_VALID|IRQ_LEVEL_ID;
    if (irq_list[0] == -1)
	link->irq.IRQInfo2 = irq_mask;
    else
	for (i = 0; i < 4; i++)
	    link->irq.IRQInfo2 |= 1 << irq_list[i];
    link->conf.Attributes = CONF_ENABLE_IRQ;
    link->conf.Vcc = 50;
    link->conf.IntType = INT_MEMORY_AND_IO;
    link->conf.Present = PRESENT_OPTION;

    /* Register with Card Services */
    link->next = dev_list;
    dev_list = link;
    client_reg.dev_info = &dev_info;
    client_reg.Attributes = INFO_IO_CLIENT | INFO_CARD_SHARE;
    client_reg.event_handler = &fdomain_event;
    client_reg.EventMask =
	CS_EVENT_RESET_REQUEST | CS_EVENT_CARD_RESET |
	CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
	CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
    client_reg.Version = 0x0210;
    client_reg.event_callback_args.client_data = link;
    ret = CardServices(RegisterClient, &link->handle, &client_reg);
    if (ret != 0) {
	cs_error(link->handle, RegisterClient, ret);
	fdomain_detach(link);
	return NULL;
    }
    
    return link;
} /* fdomain_attach */

/*====================================================================*/

static void fdomain_detach(dev_link_t *link)
{
    dev_link_t **linkp;

    DEBUG(0, "fdomain_detach(0x%p)\n", link);
    
    /* Locate device structure */
    for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
	if (*linkp == link) break;
    if (*linkp == NULL)
	return;

    if (link->state & DEV_CONFIG) {
	fdomain_release((u_long)link);
	if (link->state & DEV_STALE_CONFIG) {
	    link->state |= DEV_STALE_LINK;
	    return;
	}
    }

    if (link->handle)
	CardServices(DeregisterClient, link->handle);
    
    /* Unlink device structure, free bits */
    *linkp = link->next;
    if (link->priv)
	kfree_s(link->priv, sizeof(struct scsi_info_t));
    kfree_s(link, sizeof(struct dev_link_t));
    
} /* fdomain_detach */

/*====================================================================*/

#define CS_CHECK(fn, args...) \
while ((last_ret=CardServices(last_fn=(fn), args))!=0) goto cs_failed

#define CFG_CHECK(fn, args...) \
if (CardServices(fn, args) != 0) goto next_entry

static void fdomain_config(dev_link_t *link)
{
    client_handle_t handle;
    scsi_info_t *info;
    tuple_t tuple;
    cisparse_t parse;
    int i, last_ret, last_fn, ints[3];
    u_char tuple_data[64];
    Scsi_Device *dev;
    dev_node_t *node, **tail;
#if (LINUX_VERSION_CODE >= VERSION(2,1,75))
    struct Scsi_Host *host;
#endif
    
    handle = link->handle;
    info = link->priv;

    DEBUG(0, "fdomain_config(0x%p)\n", link);

    tuple.DesiredTuple = CISTPL_CONFIG;
    tuple.TupleData = tuple_data;
    tuple.TupleDataMax = 64;
    tuple.TupleOffset = 0;
    CS_CHECK(GetFirstTuple, handle, &tuple);
    CS_CHECK(GetTupleData, handle, &tuple);
    CS_CHECK(ParseTuple, handle, &tuple, &parse);
    link->conf.ConfigBase = parse.config.base;

    /* Configure card */
#if (LINUX_VERSION_CODE >= VERSION(2,1,23))
    driver_template.module = &__this_module;
#else
    driver_template.usage_count = &GET_USE_COUNT(&__this_module);
#endif
    link->state |= DEV_CONFIG;
    
    tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
    CS_CHECK(GetFirstTuple, handle, &tuple);
    while (1) {
	CFG_CHECK(GetTupleData, handle, &tuple);
	CFG_CHECK(ParseTuple, handle, &tuple, &parse);
	link->conf.ConfigIndex = parse.cftable_entry.index;
	link->io.BasePort1 = parse.cftable_entry.io.win[0].base;
	i = CardServices(RequestIO, handle, &link->io);
	if (i == CS_SUCCESS) break;
    next_entry:
	CS_CHECK(GetNextTuple, handle, &tuple);
    }

    CS_CHECK(RequestIRQ, handle, &link->irq);
    CS_CHECK(RequestConfiguration, handle, &link->conf);
    
    /* A bad hack... */
    release_region(link->io.BasePort1, link->io.NumPorts1);

    /* Set configuration options for the fdomain driver */
    ints[0] = 2;
    ints[1] = link->io.BasePort1;
    ints[2] = link->irq.AssignedIRQ;
    fdomain_setup("PCMCIA setup", ints);
    
    scsi_register_module(MODULE_SCSI_HA, &driver_template);

    tail = &link->dev;
    info->ndev = 0;
#if (LINUX_VERSION_CODE < VERSION(2,1,75))
    for (dev = scsi_devices; dev != NULL; dev = dev->next)
	if (dev->host->hostt == &driver_template) {
#else
    for (host = scsi_hostlist; host; host = host->next)
	if (host->hostt == &driver_template)
	    for (dev = host->host_queue; dev; dev = dev->next) {
#endif
	    u_long arg[2], id;
	    kernel_scsi_ioctl(dev, SCSI_IOCTL_GET_IDLUN, arg);
	    id = (arg[0]&0x0f) + ((arg[0]>>4)&0xf0) +
		((arg[0]>>8)&0xf00) + ((arg[0]>>12)&0xf000);
	    node = &info->node[info->ndev];
	    node->minor = 0;
	    switch (dev->type) {
	    case TYPE_TAPE:
		node->major = SCSI_TAPE_MAJOR;
		sprintf(node->dev_name, "st#%04lx", id);
		break;
	    case TYPE_DISK:
	    case TYPE_MOD:
		node->major = SCSI_DISK0_MAJOR;
		sprintf(node->dev_name, "sd#%04lx", id);
		break;
	    case TYPE_ROM:
	    case TYPE_WORM:
		node->major = SCSI_CDROM_MAJOR;
		sprintf(node->dev_name, "sr#%04lx", id);
		break;
	    default:
		node->major = SCSI_GENERIC_MAJOR;
		sprintf(node->dev_name, "sg#%04lx", id);
		break;
	    }
	    *tail = node; tail = &node->next;
	    info->ndev++;
	}
    *tail = NULL;
    if (info->ndev == 0)
	printk(KERN_INFO "fdomain_cs: no SCSI devices found\n");
    
    link->state &= ~DEV_CONFIG_PENDING;
    return;
    
cs_failed:
    cs_error(link->handle, last_fn, last_ret);
    fdomain_release((u_long)link);
    return;
    
} /* fdomain_config */

/*====================================================================*/

static void fdomain_release(u_long arg)
{
    dev_link_t *link = (dev_link_t *)arg;

    DEBUG(0, "fdomain_release(0x%p)\n", link);

    if (GET_USE_COUNT(&__this_module) != 0) {
	DEBUG(1, "fdomain_cs: release postponed, "
	      "device still open\n");
	link->state |= DEV_STALE_CONFIG;
	return;
    }

    scsi_unregister_module(MODULE_SCSI_HA, &driver_template);
    link->dev = NULL;
    
    CardServices(ReleaseConfiguration, link->handle);
    CardServices(ReleaseIO, link->handle, &link->io);
    CardServices(ReleaseIRQ, link->handle, &link->irq);
    
    link->state &= ~DEV_CONFIG;
    if (link->state & DEV_STALE_LINK)
	fdomain_detach(link);
    
} /* fdomain_release */

/*====================================================================*/

static int fdomain_event(event_t event, int priority,
			event_callback_args_t *args)
{
    dev_link_t *link = args->client_data;

    DEBUG(1, "fdomain_event(0x%06x)\n", event);
    
    switch (event) {
    case CS_EVENT_CARD_REMOVAL:
	link->state &= ~DEV_PRESENT;
	if (link->state & DEV_CONFIG) {
	    link->release.expires = RUN_AT(HZ/20);
	    add_timer(&link->release);
	}
	break;
    case CS_EVENT_CARD_INSERTION:
	link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
	fdomain_config(link);
	break;
    case CS_EVENT_PM_SUSPEND:
	link->state |= DEV_SUSPEND;
	/* Fall through... */
    case CS_EVENT_RESET_PHYSICAL:
	if (link->state & DEV_CONFIG)
	    CardServices(ReleaseConfiguration, link->handle);
	break;
    case CS_EVENT_PM_RESUME:
	link->state &= ~DEV_SUSPEND;
	/* Fall through... */
    case CS_EVENT_CARD_RESET:
	if (link->state & DEV_CONFIG) {
	    CardServices(RequestConfiguration, link->handle, &link->conf);
#if (LINUX_VERSION_CODE >= VERSION(2,1,18))
	    fdomain_16x0_reset(NULL, 0);
#else
#if (LINUX_VERSION_CODE < VERSION(2,1,0)) && (LINUX_VERSION_CODE > VERSION(2,0,34))
	    fdomain_16x0_reset(NULL, 0);
#else
	    fdomain_16x0_reset(NULL);
#endif
#endif
	}
	break;
    }
    return 0;
} /* fdomain_event */

/*====================================================================*/

int init_module(void) {
    servinfo_t serv;
    DEBUG(0, "%s\n", version);
    CardServices(GetCardServicesInfo, &serv);
    if (serv.Revision != CS_RELEASE_CODE) {
	printk(KERN_NOTICE "fdomain_cs: Card Services release "
	       "does not match!\n");
	return -1;
    }
    register_pcmcia_driver(&dev_info, &fdomain_attach, &fdomain_detach);
    return 0;
}

void cleanup_module(void) {
    DEBUG(0, "fdomain_cs: unloading\n");
    unregister_pcmcia_driver(&dev_info);
    while (dev_list != NULL)
	fdomain_detach(dev_list);
}