/*
 * PCMCIA 16-bit resource management functions
 *
 * The initial developer of the original code is David A. Hinds
 * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
 * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
 *
 * Copyright (C) 1999        David A. Hinds
 * Copyright (C) 2004-2005   Dominik Brodowski
 *
 * 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.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/device.h>

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

#include "cs_internal.h"


/* Access speed for IO windows */
static int io_speed = 0;
module_param(io_speed, int, 0444);


#ifdef CONFIG_PCMCIA_PROBE
#include <asm/irq.h>
/* mask of IRQs already reserved by other cards, we should avoid using them */
static u8 pcmcia_used_irq[NR_IRQS];
#endif


#ifdef CONFIG_PCMCIA_DEBUG
extern int ds_pc_debug;

#define ds_dbg(skt, lvl, fmt, arg...) do {                      \
        if (ds_pc_debug >= lvl)                                 \
                dev_printk(KERN_DEBUG, &skt->dev,               \
                           "pcmcia_resource: " fmt,             \
                           ## arg);                             \
} while (0)
#else
#define ds_dbg(skt, lvl, fmt, arg...) do { } while (0)
#endif



/** alloc_io_space
 *
 * Special stuff for managing IO windows, because they are scarce
 */

static int alloc_io_space(struct pcmcia_socket *s, u_int attr,
                          unsigned int *base, unsigned int num, u_int lines)
{
        int i;
        unsigned int try, align;

        align = (*base) ? (lines ? 1<<lines : 0) : 1;
        if (align && (align < num)) {
                if (*base) {
                        ds_dbg(s, 0, "odd IO request: num %#x align %#x\n",
                               num, align);
                        align = 0;
                } else
                        while (align && (align < num)) align <<= 1;
        }
        if (*base & ~(align-1)) {
                ds_dbg(s, 0, "odd IO request: base %#x align %#x\n",
                       *base, align);
                align = 0;
        }
        if ((s->features & SS_CAP_STATIC_MAP) && s->io_offset) {
                *base = s->io_offset | (*base & 0x0fff);
                return 0;
        }
        /* Check for an already-allocated window that must conflict with
         * what was asked for.  It is a hack because it does not catch all
         * potential conflicts, just the most obvious ones.
         */
        for (i = 0; i < MAX_IO_WIN; i++)
                if ((s->io[i].res) && *base &&
                    ((s->io[i].res->start & (align-1)) == *base))
                        return 1;
        for (i = 0; i < MAX_IO_WIN; i++) {
                if (!s->io[i].res) {
                        s->io[i].res = pcmcia_find_io_region(*base, num, align, s);
                        if (s->io[i].res) {
                                *base = s->io[i].res->start;
                                s->io[i].res->flags = (s->io[i].res->flags & ~IORESOURCE_BITS) | (attr & IORESOURCE_BITS);
                                s->io[i].InUse = num;
                                break;
                        } else
                                return 1;
                } else if ((s->io[i].res->flags & IORESOURCE_BITS) != (attr & IORESOURCE_BITS))
                        continue;
                /* Try to extend top of window */
                try = s->io[i].res->end + 1;
                if ((*base == 0) || (*base == try))
                        if (pcmcia_adjust_io_region(s->io[i].res, s->io[i].res->start,
                                                    s->io[i].res->end + num, s) == 0) {
                                *base = try;
                                s->io[i].InUse += num;
                                break;
                        }
                /* Try to extend bottom of window */
                try = s->io[i].res->start - num;
                if ((*base == 0) || (*base == try))
                        if (pcmcia_adjust_io_region(s->io[i].res, s->io[i].res->start - num,
                                                    s->io[i].res->end, s) == 0) {
                                *base = try;
                                s->io[i].InUse += num;
                                break;
                        }
        }
        return (i == MAX_IO_WIN);
} /* alloc_io_space */


static void release_io_space(struct pcmcia_socket *s, unsigned int base,
                             unsigned int num)
{
        int i;

        for (i = 0; i < MAX_IO_WIN; i++) {
                if (!s->io[i].res)
                        continue;
                if ((s->io[i].res->start <= base) &&
                    (s->io[i].res->end >= base+num-1)) {
                        s->io[i].InUse -= num;
                        /* Free the window if no one else is using it */
                        if (s->io[i].InUse == 0) {
                                release_resource(s->io[i].res);
                                kfree(s->io[i].res);
                                s->io[i].res = NULL;
                        }
                }
        }
} /* release_io_space */


/** pccard_access_configuration_register
 *
 * Access_configuration_register() reads and writes configuration
 * registers in attribute memory.  Memory window 0 is reserved for
 * this and the tuple reading services.
 */

int pcmcia_access_configuration_register(struct pcmcia_device *p_dev,
                                         conf_reg_t *reg)
{
        struct pcmcia_socket *s;
        config_t *c;
        int addr;
        u_char val;

        if (!p_dev || !p_dev->function_config)
                return -EINVAL;

        s = p_dev->socket;
        c = p_dev->function_config;

        if (!(c->state & CONFIG_LOCKED))
                return -EACCES;

        addr = (c->ConfigBase + reg->Offset) >> 1;

        switch (reg->Action) {
        case CS_READ:
                pcmcia_read_cis_mem(s, 1, addr, 1, &val);
                reg->Value = val;
                break;
        case CS_WRITE:
                val = reg->Value;
                pcmcia_write_cis_mem(s, 1, addr, 1, &val);
                break;
        default:
                return -EINVAL;
                break;
        }
        return 0;
} /* pcmcia_access_configuration_register */
EXPORT_SYMBOL(pcmcia_access_configuration_register);


/** pcmcia_get_window
 */
int pcmcia_get_window(struct pcmcia_socket *s, window_handle_t *handle,
                      int idx, win_req_t *req)
{
        window_t *win;
        int w;

        if (!s || !(s->state & SOCKET_PRESENT))
                return -ENODEV;
        for (w = idx; w < MAX_WIN; w++)
                if (s->state & SOCKET_WIN_REQ(w))
                        break;
        if (w == MAX_WIN)
                return -EINVAL;
        win = &s->win[w];
        req->Base = win->ctl.res->start;
        req->Size = win->ctl.res->end - win->ctl.res->start + 1;
        req->AccessSpeed = win->ctl.speed;
        req->Attributes = 0;
        if (win->ctl.flags & MAP_ATTRIB)
                req->Attributes |= WIN_MEMORY_TYPE_AM;
        if (win->ctl.flags & MAP_ACTIVE)
                req->Attributes |= WIN_ENABLE;
        if (win->ctl.flags & MAP_16BIT)
                req->Attributes |= WIN_DATA_WIDTH_16;
        if (win->ctl.flags & MAP_USE_WAIT)
                req->Attributes |= WIN_USE_WAIT;
        *handle = win;
        return 0;
} /* pcmcia_get_window */
EXPORT_SYMBOL(pcmcia_get_window);


/** pcmcia_get_mem_page
 *
 * Change the card address of an already open memory window.
 */
int pcmcia_get_mem_page(window_handle_t win, memreq_t *req)
{
        if ((win == NULL) || (win->magic != WINDOW_MAGIC))
                return -EINVAL;
        req->Page = 0;
        req->CardOffset = win->ctl.card_start;
        return 0;
} /* pcmcia_get_mem_page */
EXPORT_SYMBOL(pcmcia_get_mem_page);


int pcmcia_map_mem_page(window_handle_t win, memreq_t *req)
{
        struct pcmcia_socket *s;
        if ((win == NULL) || (win->magic != WINDOW_MAGIC))
                return -EINVAL;
        s = win->sock;
        if (req->Page != 0) {
                ds_dbg(s, 0, "failure: requested page is zero\n");
                return -EINVAL;
        }
        win->ctl.card_start = req->CardOffset;
        if (s->ops->set_mem_map(s, &win->ctl) != 0) {
                ds_dbg(s, 0, "failed to set_mem_map\n");
                return -EIO;
        }
        return 0;
} /* pcmcia_map_mem_page */
EXPORT_SYMBOL(pcmcia_map_mem_page);


/** pcmcia_modify_configuration
 *
 * Modify a locked socket configuration
 */
int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
                                modconf_t *mod)
{
        struct pcmcia_socket *s;
        config_t *c;

        s = p_dev->socket;
        c = p_dev->function_config;

        if (!(s->state & SOCKET_PRESENT))
                return -ENODEV;
        if (!(c->state & CONFIG_LOCKED))
                return -EACCES;

        if (mod->Attributes & CONF_IRQ_CHANGE_VALID) {
                if (mod->Attributes & CONF_ENABLE_IRQ) {
                        c->Attributes |= CONF_ENABLE_IRQ;
                        s->socket.io_irq = s->irq.AssignedIRQ;
                } else {
                        c->Attributes &= ~CONF_ENABLE_IRQ;
                        s->socket.io_irq = 0;
                }
                s->ops->set_socket(s, &s->socket);
        }

        if (mod->Attributes & CONF_VCC_CHANGE_VALID) {
                ds_dbg(s, 0, "changing Vcc is not allowed at this time\n");
                return -EINVAL;
        }

        /* We only allow changing Vpp1 and Vpp2 to the same value */
        if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) &&
            (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
                if (mod->Vpp1 != mod->Vpp2) {
                        ds_dbg(s, 0, "Vpp1 and Vpp2 must be the same\n");
                        return -EINVAL;
                }
                s->socket.Vpp = mod->Vpp1;
                if (s->ops->set_socket(s, &s->socket)) {
                        dev_printk(KERN_WARNING, &s->dev,
                                   "Unable to set VPP\n");
                        return -EIO;
                }
        } else if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) ||
                   (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
                ds_dbg(s, 0, "changing Vcc is not allowed at this time\n");
                return -EINVAL;
        }

        if (mod->Attributes & CONF_IO_CHANGE_WIDTH) {
                pccard_io_map io_off = { 0, 0, 0, 0, 1 };
                pccard_io_map io_on;
                int i;

                io_on.speed = io_speed;
                for (i = 0; i < MAX_IO_WIN; i++) {
                        if (!s->io[i].res)
                                continue;
                        io_off.map = i;
                        io_on.map = i;

                        io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8;
                        io_on.start = s->io[i].res->start;
                        io_on.stop = s->io[i].res->end;

                        s->ops->set_io_map(s, &io_off);
                        mdelay(40);
                        s->ops->set_io_map(s, &io_on);
                }
        }

        return 0;
} /* modify_configuration */
EXPORT_SYMBOL(pcmcia_modify_configuration);


int pcmcia_release_configuration(struct pcmcia_device *p_dev)
{
        pccard_io_map io = { 0, 0, 0, 0, 1 };
        struct pcmcia_socket *s = p_dev->socket;
        config_t *c = p_dev->function_config;
        int i;

        if (p_dev->_locked) {
                p_dev->_locked = 0;
                if (--(s->lock_count) == 0) {
                        s->socket.flags = SS_OUTPUT_ENA;   /* Is this correct? */
                        s->socket.Vpp = 0;
                        s->socket.io_irq = 0;
                        s->ops->set_socket(s, &s->socket);
                }
        }
        if (c->state & CONFIG_LOCKED) {
                c->state &= ~CONFIG_LOCKED;
                if (c->state & CONFIG_IO_REQ)
                        for (i = 0; i < MAX_IO_WIN; i++) {
                                if (!s->io[i].res)
                                        continue;
                                s->io[i].Config--;
                                if (s->io[i].Config != 0)
                                        continue;
                                io.map = i;
                                s->ops->set_io_map(s, &io);
                        }
        }

        return 0;
} /* pcmcia_release_configuration */


/** pcmcia_release_io
 *
 * Release_io() releases the I/O ranges allocated by a client.  This
 * may be invoked some time after a card ejection has already dumped
 * the actual socket configuration, so if the client is "stale", we
 * don't bother checking the port ranges against the current socket
 * values.
 */
static int pcmcia_release_io(struct pcmcia_device *p_dev, io_req_t *req)
{
        struct pcmcia_socket *s = p_dev->socket;
        config_t *c = p_dev->function_config;

        if (!p_dev->_io )
                return -EINVAL;

        p_dev->_io = 0;

        if ((c->io.BasePort1 != req->BasePort1) ||
            (c->io.NumPorts1 != req->NumPorts1) ||
            (c->io.BasePort2 != req->BasePort2) ||
            (c->io.NumPorts2 != req->NumPorts2))
                return -EINVAL;

        c->state &= ~CONFIG_IO_REQ;

        release_io_space(s, req->BasePort1, req->NumPorts1);
        if (req->NumPorts2)
                release_io_space(s, req->BasePort2, req->NumPorts2);

        return 0;
} /* pcmcia_release_io */


static int pcmcia_release_irq(struct pcmcia_device *p_dev, irq_req_t *req)
{
        struct pcmcia_socket *s = p_dev->socket;
        config_t *c= p_dev->function_config;

        if (!p_dev->_irq)
                return -EINVAL;
        p_dev->_irq = 0;

        if (c->state & CONFIG_LOCKED)
                return -EACCES;
        if (c->irq.Attributes != req->Attributes) {
                ds_dbg(s, 0, "IRQ attributes must match assigned ones\n");
                return -EINVAL;
        }
        if (s->irq.AssignedIRQ != req->AssignedIRQ) {
                ds_dbg(s, 0, "IRQ must match assigned one\n");
                return -EINVAL;
        }
        if (--s->irq.Config == 0) {
                c->state &= ~CONFIG_IRQ_REQ;
                s->irq.AssignedIRQ = 0;
        }

        if (req->Attributes & IRQ_HANDLE_PRESENT) {
                free_irq(req->AssignedIRQ, req->Instance);
        }

#ifdef CONFIG_PCMCIA_PROBE
        pcmcia_used_irq[req->AssignedIRQ]--;
#endif

        return 0;
} /* pcmcia_release_irq */


int pcmcia_release_window(window_handle_t win)
{
        struct pcmcia_socket *s;

        if ((win == NULL) || (win->magic != WINDOW_MAGIC))
                return -EINVAL;
        s = win->sock;
        if (!(win->handle->_win & CLIENT_WIN_REQ(win->index)))
                return -EINVAL;

        /* Shut down memory window */
        win->ctl.flags &= ~MAP_ACTIVE;
        s->ops->set_mem_map(s, &win->ctl);
        s->state &= ~SOCKET_WIN_REQ(win->index);

        /* Release system memory */
        if (win->ctl.res) {
                release_resource(win->ctl.res);
                kfree(win->ctl.res);
                win->ctl.res = NULL;
        }
        win->handle->_win &= ~CLIENT_WIN_REQ(win->index);

        win->magic = 0;

        return 0;
} /* pcmcia_release_window */
EXPORT_SYMBOL(pcmcia_release_window);


int pcmcia_request_configuration(struct pcmcia_device *p_dev,
                                 config_req_t *req)
{
        int i;
        u_int base;
        struct pcmcia_socket *s = p_dev->socket;
        config_t *c;
        pccard_io_map iomap;

        if (!(s->state & SOCKET_PRESENT))
                return -ENODEV;

        if (req->IntType & INT_CARDBUS) {
                ds_dbg(p_dev->socket, 0, "IntType may not be INT_CARDBUS\n");
                return -EINVAL;
        }
        c = p_dev->function_config;
        if (c->state & CONFIG_LOCKED)
                return -EACCES;

        /* Do power control.  We don't allow changes in Vcc. */
        s->socket.Vpp = req->Vpp;
        if (s->ops->set_socket(s, &s->socket)) {
                dev_printk(KERN_WARNING, &s->dev,
                           "Unable to set socket state\n");
                return -EINVAL;
        }

        /* Pick memory or I/O card, DMA mode, interrupt */
        c->IntType = req->IntType;
        c->Attributes = req->Attributes;
        if (req->IntType & INT_MEMORY_AND_IO)
                s->socket.flags |= SS_IOCARD;
        if (req->IntType & INT_ZOOMED_VIDEO)
                s->socket.flags |= SS_ZVCARD | SS_IOCARD;
        if (req->Attributes & CONF_ENABLE_DMA)
                s->socket.flags |= SS_DMA_MODE;
        if (req->Attributes & CONF_ENABLE_SPKR)
                s->socket.flags |= SS_SPKR_ENA;
        if (req->Attributes & CONF_ENABLE_IRQ)
                s->socket.io_irq = s->irq.AssignedIRQ;
        else
                s->socket.io_irq = 0;
        s->ops->set_socket(s, &s->socket);
        s->lock_count++;

        /* Set up CIS configuration registers */
        base = c->ConfigBase = req->ConfigBase;
        c->CardValues = req->Present;
        if (req->Present & PRESENT_COPY) {
                c->Copy = req->Copy;
                pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &c->Copy);
        }
        if (req->Present & PRESENT_OPTION) {
                if (s->functions == 1) {
                        c->Option = req->ConfigIndex & COR_CONFIG_MASK;
                } else {
                        c->Option = req->ConfigIndex & COR_MFC_CONFIG_MASK;
                        c->Option |= COR_FUNC_ENA|COR_IREQ_ENA;
                        if (req->Present & PRESENT_IOBASE_0)
                                c->Option |= COR_ADDR_DECODE;
                }
                if (c->state & CONFIG_IRQ_REQ)
                        if (!(c->irq.Attributes & IRQ_FORCED_PULSE))
                                c->Option |= COR_LEVEL_REQ;
                pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &c->Option);
                mdelay(40);
        }
        if (req->Present & PRESENT_STATUS) {
                c->Status = req->Status;
                pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &c->Status);
        }
        if (req->Present & PRESENT_PIN_REPLACE) {
                c->Pin = req->Pin;
                pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &c->Pin);
        }
        if (req->Present & PRESENT_EXT_STATUS) {
                c->ExtStatus = req->ExtStatus;
                pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1, &c->ExtStatus);
        }
        if (req->Present & PRESENT_IOBASE_0) {
                u_char b = c->io.BasePort1 & 0xff;
                pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b);
                b = (c->io.BasePort1 >> 8) & 0xff;
                pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b);
        }
        if (req->Present & PRESENT_IOSIZE) {
                u_char b = c->io.NumPorts1 + c->io.NumPorts2 - 1;
                pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b);
        }

        /* Configure I/O windows */
        if (c->state & CONFIG_IO_REQ) {
                iomap.speed = io_speed;
                for (i = 0; i < MAX_IO_WIN; i++)
                        if (s->io[i].res) {
                                iomap.map = i;
                                iomap.flags = MAP_ACTIVE;
                                switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) {
                                case IO_DATA_PATH_WIDTH_16:
                                        iomap.flags |= MAP_16BIT; break;
                                case IO_DATA_PATH_WIDTH_AUTO:
                                        iomap.flags |= MAP_AUTOSZ; break;
                                default:
                                        break;
                                }
                                iomap.start = s->io[i].res->start;
                                iomap.stop = s->io[i].res->end;
                                s->ops->set_io_map(s, &iomap);
                                s->io[i].Config++;
                        }
        }

        c->state |= CONFIG_LOCKED;
        p_dev->_locked = 1;
        return 0;
} /* pcmcia_request_configuration */
EXPORT_SYMBOL(pcmcia_request_configuration);


/** pcmcia_request_io
 *
 * Request_io() reserves ranges of port addresses for a socket.
 * I have not implemented range sharing or alias addressing.
 */
int pcmcia_request_io(struct pcmcia_device *p_dev, io_req_t *req)
{
        struct pcmcia_socket *s = p_dev->socket;
        config_t *c;

        if (!(s->state & SOCKET_PRESENT))
                return -ENODEV;

        if (!req)
                return -EINVAL;
        c = p_dev->function_config;
        if (c->state & CONFIG_LOCKED)
                return -EACCES;
        if (c->state & CONFIG_IO_REQ) {
                ds_dbg(s, 0, "IO already configured\n");
                return -EBUSY;
        }
        if (req->Attributes1 & (IO_SHARED | IO_FORCE_ALIAS_ACCESS)) {
                ds_dbg(s, 0, "bad attribute setting for IO region 1\n");
                return -EINVAL;
        }
        if ((req->NumPorts2 > 0) &&
            (req->Attributes2 & (IO_SHARED | IO_FORCE_ALIAS_ACCESS))) {
                ds_dbg(s, 0, "bad attribute setting for IO region 2\n");
                return -EINVAL;
        }

        ds_dbg(s, 1, "trying to allocate resource 1\n");
        if (alloc_io_space(s, req->Attributes1, &req->BasePort1,
                           req->NumPorts1, req->IOAddrLines)) {
                ds_dbg(s, 0, "allocation of resource 1 failed\n");
                return -EBUSY;
        }

        if (req->NumPorts2) {
                ds_dbg(s, 1, "trying to allocate resource 2\n");
                if (alloc_io_space(s, req->Attributes2, &req->BasePort2,
                                   req->NumPorts2, req->IOAddrLines)) {
                        ds_dbg(s, 0, "allocation of resource 2 failed\n");
                        release_io_space(s, req->BasePort1, req->NumPorts1);
                        return -EBUSY;
                }
        }

        c->io = *req;
        c->state |= CONFIG_IO_REQ;
        p_dev->_io = 1;
        return 0;
} /* pcmcia_request_io */
EXPORT_SYMBOL(pcmcia_request_io);


/** pcmcia_request_irq
 *
 * Request_irq() reserves an irq for this client.
 *
 * Also, since Linux only reserves irq's when they are actually
 * hooked, we don't guarantee that an irq will still be available
 * when the configuration is locked.  Now that I think about it,
 * there might be a way to fix this using a dummy handler.
 */

#ifdef CONFIG_PCMCIA_PROBE
static irqreturn_t test_action(int cpl, void *dev_id)
{
        return IRQ_NONE;
}
#endif

int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
{
        struct pcmcia_socket *s = p_dev->socket;
        config_t *c;
        int ret = -EINVAL, irq = 0;
        int type;

        if (!(s->state & SOCKET_PRESENT))
                return -ENODEV;
        c = p_dev->function_config;
        if (c->state & CONFIG_LOCKED)
                return -EACCES;
        if (c->state & CONFIG_IRQ_REQ) {
                ds_dbg(s, 0, "IRQ already configured\n");
                return -EBUSY;
        }

        /* Decide what type of interrupt we are registering */
        type = 0;
        if (s->functions > 1)           /* All of this ought to be handled higher up */
                type = IRQF_SHARED;
        else if (req->Attributes & IRQ_TYPE_DYNAMIC_SHARING)
                type = IRQF_SHARED;
        else printk(KERN_WARNING "pcmcia: Driver needs updating to support IRQ sharing.\n");

#ifdef CONFIG_PCMCIA_PROBE

#ifdef IRQ_NOAUTOEN
        /* if the underlying IRQ infrastructure allows for it, only allocate
         * the IRQ, but do not enable it
         */
        if (!(req->Attributes & IRQ_HANDLE_PRESENT))
                type |= IRQ_NOAUTOEN;
#endif /* IRQ_NOAUTOEN */

        if (s->irq.AssignedIRQ != 0) {
                /* If the interrupt is already assigned, it must be the same */
                irq = s->irq.AssignedIRQ;
        } else {
                int try;
                u32 mask = s->irq_mask;
                void *data = &p_dev->dev.driver; /* something unique to this device */

                for (try = 0; try < 64; try++) {
                        irq = try % 32;

                        /* marked as available by driver, and not blocked by userspace? */
                        if (!((mask >> irq) & 1))
                                continue;

                        /* avoid an IRQ which is already used by a PCMCIA card */
                        if ((try < 32) && pcmcia_used_irq[irq])
                                continue;

                        /* register the correct driver, if possible, of check whether
                         * registering a dummy handle works, i.e. if the IRQ isn't
                         * marked as used by the kernel resource management core */
                        ret = request_irq(irq,
                                          (req->Attributes & IRQ_HANDLE_PRESENT) ? req->Handler : test_action,
                                          type,
                                          p_dev->devname,
                                          (req->Attributes & IRQ_HANDLE_PRESENT) ? req->Instance : data);
                        if (!ret) {
                                if (!(req->Attributes & IRQ_HANDLE_PRESENT))
                                        free_irq(irq, data);
                                break;
                        }
                }
        }
#endif
        /* only assign PCI irq if no IRQ already assigned */
        if (ret && !s->irq.AssignedIRQ) {
                if (!s->pci_irq)
                        return ret;
                type = IRQF_SHARED;
                irq = s->pci_irq;
        }

        if (ret && (req->Attributes & IRQ_HANDLE_PRESENT)) {
                ret = request_irq(irq, req->Handler, type,
                                  p_dev->devname, req->Instance);
                if (ret)
                        return ret;
        }

        /* Make sure the fact the request type was overridden is passed back */
        if (type == IRQF_SHARED && !(req->Attributes & IRQ_TYPE_DYNAMIC_SHARING)) {
                req->Attributes |= IRQ_TYPE_DYNAMIC_SHARING;
                dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: "
                        "request for exclusive IRQ could not be fulfilled.\n");
                dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver "
                        "needs updating to supported shared IRQ lines.\n");
        }
        c->irq.Attributes = req->Attributes;
        s->irq.AssignedIRQ = req->AssignedIRQ = irq;
        s->irq.Config++;

        c->state |= CONFIG_IRQ_REQ;
        p_dev->_irq = 1;

#ifdef CONFIG_PCMCIA_PROBE
        pcmcia_used_irq[irq]++;
#endif

        return 0;
} /* pcmcia_request_irq */
EXPORT_SYMBOL(pcmcia_request_irq);


/** pcmcia_request_window
 *
 * Request_window() establishes a mapping between card memory space
 * and system memory space.
 */
int pcmcia_request_window(struct pcmcia_device **p_dev, win_req_t *req, window_handle_t *wh)
{
        struct pcmcia_socket *s = (*p_dev)->socket;
        window_t *win;
        u_long align;
        int w;

        if (!(s->state & SOCKET_PRESENT))
                return -ENODEV;
        if (req->Attributes & (WIN_PAGED | WIN_SHARED)) {
                ds_dbg(s, 0, "bad attribute setting for iomem region\n");
                return -EINVAL;
        }

        /* Window size defaults to smallest available */
        if (req->Size == 0)
                req->Size = s->map_size;
        align = (((s->features & SS_CAP_MEM_ALIGN) ||
                  (req->Attributes & WIN_STRICT_ALIGN)) ?
                 req->Size : s->map_size);
        if (req->Size & (s->map_size-1)) {
                ds_dbg(s, 0, "invalid map size\n");
                return -EINVAL;
        }
        if ((req->Base && (s->features & SS_CAP_STATIC_MAP)) ||
            (req->Base & (align-1))) {
                ds_dbg(s, 0, "invalid base address\n");
                return -EINVAL;
        }
        if (req->Base)
                align = 0;

        /* Allocate system memory window */
        for (w = 0; w < MAX_WIN; w++)
                if (!(s->state & SOCKET_WIN_REQ(w))) break;
        if (w == MAX_WIN) {
                ds_dbg(s, 0, "all windows are used already\n");
                return -EINVAL;
        }

        win = &s->win[w];
        win->magic = WINDOW_MAGIC;
        win->index = w;
        win->handle = *p_dev;
        win->sock = s;

        if (!(s->features & SS_CAP_STATIC_MAP)) {
                win->ctl.res = pcmcia_find_mem_region(req->Base, req->Size, align,
                                                      (req->Attributes & WIN_MAP_BELOW_1MB), s);
                if (!win->ctl.res) {
                        ds_dbg(s, 0, "allocating mem region failed\n");
                        return -EINVAL;
                }
        }
        (*p_dev)->_win |= CLIENT_WIN_REQ(w);

        /* Configure the socket controller */
        win->ctl.map = w+1;
        win->ctl.flags = 0;
        win->ctl.speed = req->AccessSpeed;
        if (req->Attributes & WIN_MEMORY_TYPE)
                win->ctl.flags |= MAP_ATTRIB;
        if (req->Attributes & WIN_ENABLE)
                win->ctl.flags |= MAP_ACTIVE;
        if (req->Attributes & WIN_DATA_WIDTH_16)
                win->ctl.flags |= MAP_16BIT;
        if (req->Attributes & WIN_USE_WAIT)
                win->ctl.flags |= MAP_USE_WAIT;
        win->ctl.card_start = 0;
        if (s->ops->set_mem_map(s, &win->ctl) != 0) {
                ds_dbg(s, 0, "failed to set memory mapping\n");
                return -EIO;
        }
        s->state |= SOCKET_WIN_REQ(w);

        /* Return window handle */
        if (s->features & SS_CAP_STATIC_MAP) {
                req->Base = win->ctl.static_start;
        } else {
                req->Base = win->ctl.res->start;
        }
        *wh = win;

        return 0;
} /* pcmcia_request_window */
EXPORT_SYMBOL(pcmcia_request_window);

void pcmcia_disable_device(struct pcmcia_device *p_dev) {
        pcmcia_release_configuration(p_dev);
        pcmcia_release_io(p_dev, &p_dev->io);
        pcmcia_release_irq(p_dev, &p_dev->irq);
        if (p_dev->win)
                pcmcia_release_window(p_dev->win);
}
EXPORT_SYMBOL(pcmcia_disable_device);


struct pcmcia_cfg_mem {
        tuple_t tuple;
        cisparse_t parse;
        u8 buf[256];
        cistpl_cftable_entry_t dflt;
};

/**
 * pcmcia_loop_config() - loop over configuration options
 * @p_dev:      the struct pcmcia_device which we need to loop for.
 * @conf_check: function to call for each configuration option.
 *              It gets passed the struct pcmcia_device, the CIS data
 *              describing the configuration option, and private data
 *              being passed to pcmcia_loop_config()
 * @priv_data:  private data to be passed to the conf_check function.
 *
 * pcmcia_loop_config() loops over all configuration options, and calls
 * the driver-specific conf_check() for each one, checking whether
 * it is a valid one. Returns 0 on success or errorcode otherwise.
 */
int pcmcia_loop_config(struct pcmcia_device *p_dev,
                       int      (*conf_check)   (struct pcmcia_device *p_dev,
                                                 cistpl_cftable_entry_t *cfg,
                                                 cistpl_cftable_entry_t *dflt,
                                                 unsigned int vcc,
                                                 void *priv_data),
                       void *priv_data)
{
        struct pcmcia_cfg_mem *cfg_mem;

        tuple_t *tuple;
        int ret;
        unsigned int vcc;

        cfg_mem = kzalloc(sizeof(struct pcmcia_cfg_mem), GFP_KERNEL);
        if (cfg_mem == NULL)
                return -ENOMEM;

        /* get the current Vcc setting */
        vcc = p_dev->socket->socket.Vcc;

        tuple = &cfg_mem->tuple;
        tuple->TupleData = cfg_mem->buf;
        tuple->TupleDataMax = 255;
        tuple->TupleOffset = 0;
        tuple->DesiredTuple = CISTPL_CFTABLE_ENTRY;
        tuple->Attributes = 0;

        ret = pcmcia_get_first_tuple(p_dev, tuple);
        while (!ret) {
                cistpl_cftable_entry_t *cfg = &cfg_mem->parse.cftable_entry;

                if (pcmcia_get_tuple_data(p_dev, tuple))
                        goto next_entry;

                if (pcmcia_parse_tuple(tuple, &cfg_mem->parse))
                        goto next_entry;

                /* default values */
                p_dev->conf.ConfigIndex = cfg->index;
                if (cfg->flags & CISTPL_CFTABLE_DEFAULT)
                        cfg_mem->dflt = *cfg;

                ret = conf_check(p_dev, cfg, &cfg_mem->dflt, vcc, priv_data);
                if (!ret)
                        break;

next_entry:
                ret = pcmcia_get_next_tuple(p_dev, tuple);
        }

        return ret;
}
EXPORT_SYMBOL(pcmcia_loop_config);