/*
 *  drivers/pcmcia/m32r_pcc.c
 *
 *  Device driver for the PCMCIA functionality of M32R.
 *
 *  Copyright (c) 2001, 2002, 2003, 2004
 *    Hiroyuki Kondo, Naoto Sugai, Hayato Fujiwara
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/bitops.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/addrspace.h>

#include <pcmcia/ss.h>

/* XXX: should be moved into asm/irq.h */
#define PCC0_IRQ 24
#define PCC1_IRQ 25

#include "m32r_pcc.h"

#define CHAOS_PCC_DEBUG
#ifdef CHAOS_PCC_DEBUG
        static volatile u_short dummy_readbuf;
#endif

#define PCC_DEBUG_DBEX


/* Poll status interval -- 0 means default to interrupt */
static int poll_interval = 0;

typedef enum pcc_space { as_none = 0, as_comm, as_attr, as_io } pcc_as_t;

typedef struct pcc_socket {
        u_short                 type, flags;
        struct pcmcia_socket    socket;
        unsigned int            number;
        unsigned int            ioaddr;
        u_long                  mapaddr;
        u_long                  base;   /* PCC register base */
        u_char                  cs_irq, intr;
        pccard_io_map           io_map[MAX_IO_WIN];
        pccard_mem_map          mem_map[MAX_WIN];
        u_char                  io_win;
        u_char                  mem_win;
        pcc_as_t                current_space;
        u_char                  last_iodbex;
#ifdef CHAOS_PCC_DEBUG
        u_char                  last_iosize;
#endif
#ifdef CONFIG_PROC_FS
        struct proc_dir_entry *proc;
#endif
} pcc_socket_t;

static int pcc_sockets = 0;
static pcc_socket_t socket[M32R_MAX_PCC] = {
        { 0, }, /* ... */
};

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

static unsigned int pcc_get(u_short, unsigned int);
static void pcc_set(u_short, unsigned int , unsigned int );

static DEFINE_SPINLOCK(pcc_lock);

void pcc_iorw(int sock, unsigned long port, void *buf, size_t size, size_t nmemb, int wr, int flag)
{
        u_long addr;
        u_long flags;
        int need_ex;
#ifdef PCC_DEBUG_DBEX
        int _dbex;
#endif
        pcc_socket_t *t = &socket[sock];
#ifdef CHAOS_PCC_DEBUG
        int map_changed = 0;
#endif

        /* Need lock ? */
        spin_lock_irqsave(&pcc_lock, flags);

        /*
         * Check if need dbex
         */
        need_ex = (size > 1 && flag == 0) ? PCMOD_DBEX : 0;
#ifdef PCC_DEBUG_DBEX
        _dbex = need_ex;
        need_ex = 0;
#endif

        /*
         * calculate access address
         */
        addr = t->mapaddr + port - t->ioaddr + KSEG1; /* XXX */

        /*
         * Check current mapping
         */
        if (t->current_space != as_io || t->last_iodbex != need_ex) {

                u_long cbsz;

                /*
                 * Disable first
                 */
                pcc_set(sock, PCCR, 0);

                /*
                 * Set mode and io address
                 */
                cbsz = (t->flags & MAP_16BIT) ? 0 : PCMOD_CBSZ;
                pcc_set(sock, PCMOD, PCMOD_AS_IO | cbsz | need_ex);
                pcc_set(sock, PCADR, addr & 0x1ff00000);

                /*
                 * Enable and read it
                 */
                pcc_set(sock, PCCR, 1);

#ifdef CHAOS_PCC_DEBUG
#if 0
                map_changed = (t->current_space == as_attr && size == 2); /* XXX */
#else
                map_changed = 1;
#endif
#endif
                t->current_space = as_io;
        }

        /*
         * access to IO space
         */
        if (size == 1) {
                /* Byte */
                unsigned char *bp = (unsigned char *)buf;

#ifdef CHAOS_DEBUG
                if (map_changed) {
                        dummy_readbuf = readb(addr);
                }
#endif
                if (wr) {
                        /* write Byte */
                        while (nmemb--) {
                                writeb(*bp++, addr);
                        }
                } else {
                        /* read Byte */
                        while (nmemb--) {
                        *bp++ = readb(addr);
                        }
                }
        } else {
                /* Word */
                unsigned short *bp = (unsigned short *)buf;

#ifdef CHAOS_PCC_DEBUG
                if (map_changed) {
                        dummy_readbuf = readw(addr);
                }
#endif
                if (wr) {
                        /* write Word */
                        while (nmemb--) {
#ifdef PCC_DEBUG_DBEX
                                if (_dbex) {
                                        unsigned char *cp = (unsigned char *)bp;
                                        unsigned short tmp;
                                        tmp = cp[1] << 8 | cp[0];
                                        writew(tmp, addr);
                                        bp++;
                                } else
#endif
                                writew(*bp++, addr);
                }
            } else {
                /* read Word */
                while (nmemb--) {
#ifdef  PCC_DEBUG_DBEX
                                if (_dbex) {
                                        unsigned char *cp = (unsigned char *)bp;
                                        unsigned short tmp;
                                        tmp = readw(addr);
                                        cp[0] = tmp & 0xff;
                                        cp[1] = (tmp >> 8) & 0xff;
                                        bp++;
                                } else
#endif
                                *bp++ = readw(addr);
                }
            }
        }

#if 1
        /* addr is no longer used */
        if ((addr = pcc_get(sock, PCIRC)) & PCIRC_BWERR) {
          printk("m32r_pcc: BWERR detected : port 0x%04lx : iosize %dbit\n",
                         port, size * 8);
          pcc_set(sock, PCIRC, addr);
        }
#endif
        /*
         * save state
         */
        t->last_iosize = size;
        t->last_iodbex = need_ex;

        /* Need lock ? */

        spin_unlock_irqrestore(&pcc_lock,flags);

        return;
}

void pcc_ioread(int sock, unsigned long port, void *buf, size_t size, size_t nmemb, int flag) {
        pcc_iorw(sock, port, buf, size, nmemb, 0, flag);
}

void pcc_iowrite(int sock, unsigned long port, void *buf, size_t size, size_t nmemb, int flag) {
    pcc_iorw(sock, port, buf, size, nmemb, 1, flag);
}

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

#define IS_REGISTERED           0x2000
#define IS_ALIVE                0x8000

typedef struct pcc_t {
        char                    *name;
        u_short                 flags;
} pcc_t;

static pcc_t pcc[] = {
        { "xnux2", 0 }, { "xnux2", 0 },
};

static irqreturn_t pcc_interrupt(int, void *);

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

static struct timer_list poll_timer;

static unsigned int pcc_get(u_short sock, unsigned int reg)
{
        return inl(socket[sock].base + reg);
}


static void pcc_set(u_short sock, unsigned int reg, unsigned int data)
{
        outl(data, socket[sock].base + reg);
}

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

        See if a card is present, powered up, in IO mode, and already
        bound to a (non PC Card) Linux driver.  We leave these alone.

        We make an exception for cards that seem to be serial devices.

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

static int __init is_alive(u_short sock)
{
        unsigned int stat;
        unsigned int f;

        stat = pcc_get(sock, PCIRC);
        f = (stat & (PCIRC_CDIN1 | PCIRC_CDIN2)) >> 16;
        if(!f){
                printk("m32r_pcc: No Card is detected at socket %d : stat = 0x%08x\n",stat,sock);
                return 0;
        }
        if(f!=3)
                printk("m32r_pcc: Insertion fail (%.8x) at socket %d\n",stat,sock);
        else
                printk("m32r_pcc: Card is Inserted at socket %d(%.8x)\n",sock,stat);
        return 0;
}

static void add_pcc_socket(ulong base, int irq, ulong mapaddr,
                           unsigned int ioaddr)
{
        pcc_socket_t *t = &socket[pcc_sockets];

        /* add sockets */
        t->ioaddr = ioaddr;
        t->mapaddr = mapaddr;
        t->base = base;
#ifdef CHAOS_PCC_DEBUG
        t->flags = MAP_16BIT;
#else
        t->flags = 0;
#endif
        if (is_alive(pcc_sockets))
                t->flags |= IS_ALIVE;

        /* add pcc */
        if (t->base > 0) {
                request_region(t->base, 0x20, "m32r-pcc");
        }

        printk(KERN_INFO "  %s ", pcc[pcc_sockets].name);
        printk("pcc at 0x%08lx\n", t->base);

        /* Update socket interrupt information, capabilities */
        t->socket.features |= (SS_CAP_PCCARD | SS_CAP_STATIC_MAP);
        t->socket.map_size = M32R_PCC_MAPSIZE;
        t->socket.io_offset = ioaddr;   /* use for io access offset */
        t->socket.irq_mask = 0;
        t->socket.pci_irq = 2 + pcc_sockets; /* XXX */

        request_irq(irq, pcc_interrupt, 0, "m32r-pcc", pcc_interrupt);

        pcc_sockets++;

        return;
}


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

static irqreturn_t pcc_interrupt(int irq, void *dev)
{
        int i, j, irc;
        u_int events, active;
        int handled = 0;

        pr_debug("m32r_pcc: pcc_interrupt(%d)\n", irq);

        for (j = 0; j < 20; j++) {
                active = 0;
                for (i = 0; i < pcc_sockets; i++) {
                        if ((socket[i].cs_irq != irq) &&
                                (socket[i].socket.pci_irq != irq))
                                continue;
                        handled = 1;
                        irc = pcc_get(i, PCIRC);
                        irc >>=16;
                        pr_debug("m32r_pcc: interrupt: socket %d pcirc 0x%02x ",
                                i, irc);
                        if (!irc)
                                continue;

                        events = (irc) ? SS_DETECT : 0;
                        events |= (pcc_get(i,PCCR) & PCCR_PCEN) ? SS_READY : 0;
                        pr_debug("m32r_pcc: event 0x%02x\n", events);

                        if (events)
                                pcmcia_parse_events(&socket[i].socket, events);

                        active |= events;
                        active = 0;
                }
                if (!active) break;
        }
        if (j == 20)
                printk(KERN_NOTICE "m32r-pcc: infinite loop in interrupt handler\n");

        pr_debug("m32r_pcc: interrupt done\n");

        return IRQ_RETVAL(handled);
} /* pcc_interrupt */

static void pcc_interrupt_wrapper(u_long data)
{
        pcc_interrupt(0, NULL);
        init_timer(&poll_timer);
        poll_timer.expires = jiffies + poll_interval;
        add_timer(&poll_timer);
}

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

static int _pcc_get_status(u_short sock, u_int *value)
{
        u_int status;

        status = pcc_get(sock,PCIRC);
        *value = ((status & PCIRC_CDIN1) && (status & PCIRC_CDIN2))
                ? SS_DETECT : 0;

        status = pcc_get(sock,PCCR);

#if 0
        *value |= (status & PCCR_PCEN) ? SS_READY : 0;
#else
        *value |= SS_READY; /* XXX: always */
#endif

        status = pcc_get(sock,PCCSIGCR);
        *value |= (status & PCCSIGCR_VEN) ? SS_POWERON : 0;

        pr_debug("m32r_pcc: GetStatus(%d) = %#4.4x\n", sock, *value);
        return 0;
} /* _get_status */

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

static int _pcc_set_socket(u_short sock, socket_state_t *state)
{
        u_long reg = 0;

        pr_debug("m32r_pcc: SetSocket(%d, flags %#3.3x, Vcc %d, Vpp %d, "
                  "io_irq %d, csc_mask %#2.2x)", sock, state->flags,
                  state->Vcc, state->Vpp, state->io_irq, state->csc_mask);

        if (state->Vcc) {
                /*
                 * 5V only
                 */
                if (state->Vcc == 50) {
                        reg |= PCCSIGCR_VEN;
                } else {
                        return -EINVAL;
                }
        }

        if (state->flags & SS_RESET) {
                pr_debug("m32r_pcc: :RESET\n");
                reg |= PCCSIGCR_CRST;
        }
        if (state->flags & SS_OUTPUT_ENA){
                pr_debug("m32r_pcc: :OUTPUT_ENA\n");
                /* bit clear */
        } else {
                reg |= PCCSIGCR_SEN;
        }

        pcc_set(sock,PCCSIGCR,reg);

        if(state->flags & SS_IOCARD){
                pr_debug("m32r_pcc: :IOCARD");
        }
        if (state->flags & SS_PWR_AUTO) {
                pr_debug("m32r_pcc: :PWR_AUTO");
        }
        if (state->csc_mask & SS_DETECT)
                pr_debug("m32r_pcc: :csc-SS_DETECT");
        if (state->flags & SS_IOCARD) {
                if (state->csc_mask & SS_STSCHG)
                        pr_debug("m32r_pcc: :STSCHG");
        } else {
                if (state->csc_mask & SS_BATDEAD)
                        pr_debug("m32r_pcc: :BATDEAD");
                if (state->csc_mask & SS_BATWARN)
                        pr_debug("m32r_pcc: :BATWARN");
                if (state->csc_mask & SS_READY)
                        pr_debug("m32r_pcc: :READY");
        }
        pr_debug("m32r_pcc: \n");
        return 0;
} /* _set_socket */

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

static int _pcc_set_io_map(u_short sock, struct pccard_io_map *io)
{
        u_char map;

        pr_debug("m32r_pcc: SetIOMap(%d, %d, %#2.2x, %d ns, "
                  "%#llx-%#llx)\n", sock, io->map, io->flags,
                  io->speed, (unsigned long long)io->start,
                  (unsigned long long)io->stop);
        map = io->map;

        return 0;
} /* _set_io_map */

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

static int _pcc_set_mem_map(u_short sock, struct pccard_mem_map *mem)
{

        u_char map = mem->map;
        u_long mode;
        u_long addr;
        pcc_socket_t *t = &socket[sock];
#ifdef CHAOS_PCC_DEBUG
#if 0
        pcc_as_t last = t->current_space;
#endif
#endif

        pr_debug("m32r_pcc: SetMemMap(%d, %d, %#2.2x, %d ns, "
                 "%#llx,  %#x)\n", sock, map, mem->flags,
                 mem->speed, (unsigned long long)mem->static_start,
                 mem->card_start);

        /*
         * sanity check
         */
        if ((map > MAX_WIN) || (mem->card_start > 0x3ffffff)){
                return -EINVAL;
        }

        /*
         * de-activate
         */
        if ((mem->flags & MAP_ACTIVE) == 0) {
                t->current_space = as_none;
                return 0;
        }

        /*
         * Disable first
         */
        pcc_set(sock, PCCR, 0);

        /*
         * Set mode
         */
        if (mem->flags & MAP_ATTRIB) {
                mode = PCMOD_AS_ATTRIB | PCMOD_CBSZ;
                t->current_space = as_attr;
        } else {
                mode = 0; /* common memory */
                t->current_space = as_comm;
        }
        pcc_set(sock, PCMOD, mode);

        /*
         * Set address
         */
        addr = t->mapaddr + (mem->card_start & M32R_PCC_MAPMASK);
        pcc_set(sock, PCADR, addr);

        mem->static_start = addr + mem->card_start;

        /*
         * Enable again
         */
        pcc_set(sock, PCCR, 1);

#ifdef CHAOS_PCC_DEBUG
#if 0
        if (last != as_attr) {
#else
        if (1) {
#endif
                dummy_readbuf = *(u_char *)(addr + KSEG1);
        }
#endif

        return 0;

} /* _set_mem_map */

#if 0 /* driver model ordering issue */
/*======================================================================

        Routines for accessing socket information and register dumps via
        /proc/bus/pccard/...

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

static ssize_t show_info(struct class_device *class_dev, char *buf)
{
        pcc_socket_t *s = container_of(class_dev, struct pcc_socket,
                socket.dev);

        return sprintf(buf, "type:     %s\nbase addr:    0x%08lx\n",
                pcc[s->type].name, s->base);
}

static ssize_t show_exca(struct class_device *class_dev, char *buf)
{
        /* FIXME */

        return 0;
}

static CLASS_DEVICE_ATTR(info, S_IRUGO, show_info, NULL);
static CLASS_DEVICE_ATTR(exca, S_IRUGO, show_exca, NULL);
#endif

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

/* this is horribly ugly... proper locking needs to be done here at
 * some time... */
#define LOCKED(x) do {                                  \
        int retval;                                     \
        unsigned long flags;                            \
        spin_lock_irqsave(&pcc_lock, flags);            \
        retval = x;                                     \
        spin_unlock_irqrestore(&pcc_lock, flags);       \
        return retval;                                  \
} while (0)


static int pcc_get_status(struct pcmcia_socket *s, u_int *value)
{
        unsigned int sock = container_of(s, struct pcc_socket, socket)->number;

        if (socket[sock].flags & IS_ALIVE) {
                *value = 0;
                return -EINVAL;
        }
        LOCKED(_pcc_get_status(sock, value));
}

static int pcc_set_socket(struct pcmcia_socket *s, socket_state_t *state)
{
        unsigned int sock = container_of(s, struct pcc_socket, socket)->number;

        if (socket[sock].flags & IS_ALIVE)
                return -EINVAL;

        LOCKED(_pcc_set_socket(sock, state));
}

static int pcc_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
{
        unsigned int sock = container_of(s, struct pcc_socket, socket)->number;

        if (socket[sock].flags & IS_ALIVE)
                return -EINVAL;
        LOCKED(_pcc_set_io_map(sock, io));
}

static int pcc_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *mem)
{
        unsigned int sock = container_of(s, struct pcc_socket, socket)->number;

        if (socket[sock].flags & IS_ALIVE)
                return -EINVAL;
        LOCKED(_pcc_set_mem_map(sock, mem));
}

static int pcc_init(struct pcmcia_socket *s)
{
        pr_debug("m32r_pcc: init call\n");
        return 0;
}

static struct pccard_operations pcc_operations = {
        .init                   = pcc_init,
        .get_status             = pcc_get_status,
        .set_socket             = pcc_set_socket,
        .set_io_map             = pcc_set_io_map,
        .set_mem_map            = pcc_set_mem_map,
};

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

static struct platform_driver pcc_driver = {
        .driver = {
                .name           = "pcc",
        },
};

static struct platform_device pcc_device = {
        .name = "pcc",
        .id = 0,
};

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

static int __init init_m32r_pcc(void)
{
        int i, ret;

        ret = platform_driver_register(&pcc_driver);
        if (ret)
                return ret;

        ret = platform_device_register(&pcc_device);
        if (ret){
                platform_driver_unregister(&pcc_driver);
                return ret;
        }

        printk(KERN_INFO "m32r PCC probe:\n");

        pcc_sockets = 0;

        add_pcc_socket(M32R_PCC0_BASE, PCC0_IRQ, M32R_PCC0_MAPBASE, 0x1000);

#ifdef CONFIG_M32RPCC_SLOT2
        add_pcc_socket(M32R_PCC1_BASE, PCC1_IRQ, M32R_PCC1_MAPBASE, 0x2000);
#endif

        if (pcc_sockets == 0) {
                printk("socket is not found.\n");
                platform_device_unregister(&pcc_device);
                platform_driver_unregister(&pcc_driver);
                return -ENODEV;
        }

        /* Set up interrupt handler(s) */

        for (i = 0 ; i < pcc_sockets ; i++) {
                socket[i].socket.dev.parent = &pcc_device.dev;
                socket[i].socket.ops = &pcc_operations;
                socket[i].socket.resource_ops = &pccard_static_ops;
                socket[i].socket.owner = THIS_MODULE;
                socket[i].number = i;
                ret = pcmcia_register_socket(&socket[i].socket);
                if (!ret)
                        socket[i].flags |= IS_REGISTERED;
        }

        /* Finally, schedule a polling interrupt */
        if (poll_interval != 0) {
                poll_timer.function = pcc_interrupt_wrapper;
                poll_timer.data = 0;
                init_timer(&poll_timer);
                poll_timer.expires = jiffies + poll_interval;
                add_timer(&poll_timer);
        }

        return 0;
} /* init_m32r_pcc */

static void __exit exit_m32r_pcc(void)
{
        int i;

        for (i = 0; i < pcc_sockets; i++)
                if (socket[i].flags & IS_REGISTERED)
                        pcmcia_unregister_socket(&socket[i].socket);

        platform_device_unregister(&pcc_device);
        if (poll_interval != 0)
                del_timer_sync(&poll_timer);

        platform_driver_unregister(&pcc_driver);
} /* exit_m32r_pcc */

module_init(init_m32r_pcc);
module_exit(exit_m32r_pcc);
MODULE_LICENSE("Dual MPL/GPL");
/*====================================================================*/