/*
 * m8xx_pcmcia.c - Linux PCMCIA socket driver for the mpc8xx series.
 *
 * (C) 1999-2000 Magnus Damm <damm@opensource.se>
 * (C) 2001-2002 Montavista Software, Inc.
 *     <mlocke@mvista.com>
 *
 * Support for two slots by Cyclades Corporation
 *     <oliver.kurth@cyclades.de>
 * Further fixes, v2.6 kernel port
 *     <marcelo.tosatti@cyclades.com>
 * 
 * Some fixes, additions (C) 2005-2007 Montavista Software, Inc.
 *     <vbordug@ru.mvista.com>
 *
 * "The ExCA standard specifies that socket controllers should provide
 * two IO and five memory windows per socket, which can be independently
 * configured and positioned in the host address space and mapped to
 * arbitrary segments of card address space. " - David A Hinds. 1999
 *
 * This controller does _not_ meet the ExCA standard.
 *
 * m8xx pcmcia controller brief info:
 * + 8 windows (attrib, mem, i/o)
 * + up to two slots (SLOT_A and SLOT_B)
 * + inputpins, outputpins, event and mask registers.
 * - no offset register. sigh.
 *
 * Because of the lacking offset register we must map the whole card.
 * We assign each memory window PCMCIA_MEM_WIN_SIZE address space.
 * Make sure there is (PCMCIA_MEM_WIN_SIZE * PCMCIA_MEM_WIN_NO
 * * PCMCIA_SOCKETS_NO) bytes at PCMCIA_MEM_WIN_BASE.
 * The i/o windows are dynamically allocated at PCMCIA_IO_WIN_BASE.
 * They are maximum 64KByte each...
 */

#include <linux/module.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/slab.h>
#include <linux/timer.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fsl_devices.h>
#include <linux/bitops.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>

#include <asm/io.h>
#include <asm/system.h>
#include <asm/time.h>
#include <asm/mpc8xx.h>
#include <asm/8xx_immap.h>
#include <asm/irq.h>
#include <asm/fs_pd.h>

#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/ss.h>

#ifdef PCMCIA_DEBUG
static int pc_debug = PCMCIA_DEBUG;
module_param(pc_debug, int, 0);
#define dprintk(args...) printk(KERN_DEBUG "m8xx_pcmcia: " args);
#else
#define dprintk(args...)
#endif

#define pcmcia_info(args...) printk(KERN_INFO "m8xx_pcmcia: "args)
#define pcmcia_error(args...) printk(KERN_ERR "m8xx_pcmcia: "args)

static const char *version = "Version 0.06, Aug 2005";
MODULE_LICENSE("Dual MPL/GPL");

#if !defined(CONFIG_PCMCIA_SLOT_A) && !defined(CONFIG_PCMCIA_SLOT_B)

/* The RPX series use SLOT_B */
#if defined(CONFIG_RPXCLASSIC) || defined(CONFIG_RPXLITE)
#define CONFIG_PCMCIA_SLOT_B
#define CONFIG_BD_IS_MHZ
#endif

/* The ADS board use SLOT_A */
#ifdef CONFIG_ADS
#define CONFIG_PCMCIA_SLOT_A
#define CONFIG_BD_IS_MHZ
#endif

/* The FADS series are a mess */
#ifdef CONFIG_FADS
#if defined(CONFIG_MPC860T) || defined(CONFIG_MPC860) || defined(CONFIG_MPC821)
#define CONFIG_PCMCIA_SLOT_A
#else
#define CONFIG_PCMCIA_SLOT_B
#endif
#endif

#if defined(CONFIG_MPC885ADS)
#define CONFIG_PCMCIA_SLOT_A
#define PCMCIA_GLITCHY_CD
#endif

/* Cyclades ACS uses both slots */
#ifdef CONFIG_PRxK
#define CONFIG_PCMCIA_SLOT_A
#define CONFIG_PCMCIA_SLOT_B
#endif

#endif                          /* !defined(CONFIG_PCMCIA_SLOT_A) && !defined(CONFIG_PCMCIA_SLOT_B) */

#if defined(CONFIG_PCMCIA_SLOT_A) && defined(CONFIG_PCMCIA_SLOT_B)

#define PCMCIA_SOCKETS_NO 2
/* We have only 8 windows, dualsocket support will be limited. */
#define PCMCIA_MEM_WIN_NO 2
#define PCMCIA_IO_WIN_NO  2
#define PCMCIA_SLOT_MSG "SLOT_A and SLOT_B"

#elif defined(CONFIG_PCMCIA_SLOT_A) || defined(CONFIG_PCMCIA_SLOT_B)

#define PCMCIA_SOCKETS_NO 1
/* full support for one slot */
#define PCMCIA_MEM_WIN_NO 5
#define PCMCIA_IO_WIN_NO  2

/* define _slot_ to be able to optimize macros */

#ifdef CONFIG_PCMCIA_SLOT_A
#define _slot_ 0
#define PCMCIA_SLOT_MSG "SLOT_A"
#else
#define _slot_ 1
#define PCMCIA_SLOT_MSG "SLOT_B"
#endif

#else
#error m8xx_pcmcia: Bad configuration!
#endif

/* ------------------------------------------------------------------------- */

#define PCMCIA_MEM_WIN_BASE 0xe0000000  /* base address for memory window 0   */
#define PCMCIA_MEM_WIN_SIZE 0x04000000  /* each memory window is 64 MByte     */
#define PCMCIA_IO_WIN_BASE  _IO_BASE    /* base address for io window 0       */
/* ------------------------------------------------------------------------- */

static int pcmcia_schlvl;

static DEFINE_SPINLOCK(events_lock);

#define PCMCIA_SOCKET_KEY_5V 1
#define PCMCIA_SOCKET_KEY_LV 2

/* look up table for pgcrx registers */
static u32 *m8xx_pgcrx[2];

/*
 * This structure is used to address each window in the PCMCIA controller.
 *
 * Keep in mind that we assume that pcmcia_win[n+1] is mapped directly
 * after pcmcia_win[n]...
 */

struct pcmcia_win {
        u32 br;
        u32 or;
};

/*
 * For some reason the hardware guys decided to make both slots share
 * some registers.
 *
 * Could someone invent object oriented hardware ?
 *
 * The macros are used to get the right bit from the registers.
 * SLOT_A : slot = 0
 * SLOT_B : slot = 1
 */

#define M8XX_PCMCIA_VS1(slot)      (0x80000000 >> (slot << 4))
#define M8XX_PCMCIA_VS2(slot)      (0x40000000 >> (slot << 4))
#define M8XX_PCMCIA_VS_MASK(slot)  (0xc0000000 >> (slot << 4))
#define M8XX_PCMCIA_VS_SHIFT(slot) (30 - (slot << 4))

#define M8XX_PCMCIA_WP(slot)       (0x20000000 >> (slot << 4))
#define M8XX_PCMCIA_CD2(slot)      (0x10000000 >> (slot << 4))
#define M8XX_PCMCIA_CD1(slot)      (0x08000000 >> (slot << 4))
#define M8XX_PCMCIA_BVD2(slot)     (0x04000000 >> (slot << 4))
#define M8XX_PCMCIA_BVD1(slot)     (0x02000000 >> (slot << 4))
#define M8XX_PCMCIA_RDY(slot)      (0x01000000 >> (slot << 4))
#define M8XX_PCMCIA_RDY_L(slot)    (0x00800000 >> (slot << 4))
#define M8XX_PCMCIA_RDY_H(slot)    (0x00400000 >> (slot << 4))
#define M8XX_PCMCIA_RDY_R(slot)    (0x00200000 >> (slot << 4))
#define M8XX_PCMCIA_RDY_F(slot)    (0x00100000 >> (slot << 4))
#define M8XX_PCMCIA_MASK(slot)     (0xFFFF0000 >> (slot << 4))

#define M8XX_PCMCIA_POR_VALID    0x00000001
#define M8XX_PCMCIA_POR_WRPROT   0x00000002
#define M8XX_PCMCIA_POR_ATTRMEM  0x00000010
#define M8XX_PCMCIA_POR_IO       0x00000018
#define M8XX_PCMCIA_POR_16BIT    0x00000040

#define M8XX_PGCRX(slot)  m8xx_pgcrx[slot]

#define M8XX_PGCRX_CXOE    0x00000080
#define M8XX_PGCRX_CXRESET 0x00000040

/* we keep one lookup table per socket to check flags */

#define PCMCIA_EVENTS_MAX 5     /* 4 max at a time + termination */

struct event_table {
        u32 regbit;
        u32 eventbit;
};

static const char driver_name[] = "m8xx-pcmcia";

struct socket_info {
        void (*handler) (void *info, u32 events);
        void *info;

        u32 slot;
        pcmconf8xx_t *pcmcia;
        u32 bus_freq;
        int hwirq;

        socket_state_t state;
        struct pccard_mem_map mem_win[PCMCIA_MEM_WIN_NO];
        struct pccard_io_map io_win[PCMCIA_IO_WIN_NO];
        struct event_table events[PCMCIA_EVENTS_MAX];
        struct pcmcia_socket socket;
};

static struct socket_info socket[PCMCIA_SOCKETS_NO];

/*
 * Search this table to see if the windowsize is
 * supported...
 */

#define M8XX_SIZES_NO 32

static const u32 m8xx_size_to_gray[M8XX_SIZES_NO] = {
        0x00000001, 0x00000002, 0x00000008, 0x00000004,
        0x00000080, 0x00000040, 0x00000010, 0x00000020,
        0x00008000, 0x00004000, 0x00001000, 0x00002000,
        0x00000100, 0x00000200, 0x00000800, 0x00000400,

        0x0fffffff, 0xffffffff, 0xffffffff, 0xffffffff,
        0x01000000, 0x02000000, 0xffffffff, 0x04000000,
        0x00010000, 0x00020000, 0x00080000, 0x00040000,
        0x00800000, 0x00400000, 0x00100000, 0x00200000
};

/* ------------------------------------------------------------------------- */

static irqreturn_t m8xx_interrupt(int irq, void *dev);

#define PCMCIA_BMT_LIMIT (15*4) /* Bus Monitor Timeout value */

/* ------------------------------------------------------------------------- */
/* board specific stuff:                                                     */
/* voltage_set(), hardware_enable() and hardware_disable()                   */
/* ------------------------------------------------------------------------- */
/* RPX Boards from Embedded Planet                                           */

#if defined(CONFIG_RPXCLASSIC) || defined(CONFIG_RPXLITE)

/* The RPX boards seems to have it's bus monitor timeout set to 6*8 clocks.
 * SYPCR is write once only, therefore must the slowest memory be faster
 * than the bus monitor or we will get a machine check due to the bus timeout.
 */

#define PCMCIA_BOARD_MSG "RPX CLASSIC or RPX LITE"

#undef PCMCIA_BMT_LIMIT
#define PCMCIA_BMT_LIMIT (6*8)

static int voltage_set(int slot, int vcc, int vpp)
{
        u32 reg = 0;

        switch (vcc) {
        case 0:
                break;
        case 33:
                reg |= BCSR1_PCVCTL4;
                break;
        case 50:
                reg |= BCSR1_PCVCTL5;
                break;
        default:
                return 1;
        }

        switch (vpp) {
        case 0:
                break;
        case 33:
        case 50:
                if (vcc == vpp)
                        reg |= BCSR1_PCVCTL6;
                else
                        return 1;
                break;
        case 120:
                reg |= BCSR1_PCVCTL7;
        default:
                return 1;
        }

        if (!((vcc == 50) || (vcc == 0)))
                return 1;

        /* first, turn off all power */

        out_be32(((u32 *) RPX_CSR_ADDR),
                 in_be32(((u32 *) RPX_CSR_ADDR)) & ~(BCSR1_PCVCTL4 |
                                                     BCSR1_PCVCTL5 |
                                                     BCSR1_PCVCTL6 |
                                                     BCSR1_PCVCTL7));

        /* enable new powersettings */

        out_be32(((u32 *) RPX_CSR_ADDR), in_be32(((u32 *) RPX_CSR_ADDR)) | reg);

        return 0;
}

#define socket_get(_slot_) PCMCIA_SOCKET_KEY_5V
#define hardware_enable(_slot_) /* No hardware to enable */
#define hardware_disable(_slot_)        /* No hardware to disable */

#endif                          /* CONFIG_RPXCLASSIC */

/* FADS Boards from Motorola                                               */

#if defined(CONFIG_FADS)

#define PCMCIA_BOARD_MSG "FADS"

static int voltage_set(int slot, int vcc, int vpp)
{
        u32 reg = 0;

        switch (vcc) {
        case 0:
                break;
        case 33:
                reg |= BCSR1_PCCVCC0;
                break;
        case 50:
                reg |= BCSR1_PCCVCC1;
                break;
        default:
                return 1;
        }

        switch (vpp) {
        case 0:
                break;
        case 33:
        case 50:
                if (vcc == vpp)
                        reg |= BCSR1_PCCVPP1;
                else
                        return 1;
                break;
        case 120:
                if ((vcc == 33) || (vcc == 50))
                        reg |= BCSR1_PCCVPP0;
                else
                        return 1;
        default:
                return 1;
        }

        /* first, turn off all power */
        out_be32((u32 *) BCSR1,
                 in_be32((u32 *) BCSR1) & ~(BCSR1_PCCVCC_MASK |
                                            BCSR1_PCCVPP_MASK));

        /* enable new powersettings */
        out_be32((u32 *) BCSR1, in_be32((u32 *) BCSR1) | reg);

        return 0;
}

#define socket_get(_slot_) PCMCIA_SOCKET_KEY_5V

static void hardware_enable(int slot)
{
        out_be32((u32 *) BCSR1, in_be32((u32 *) BCSR1) & ~BCSR1_PCCEN);
}

static void hardware_disable(int slot)
{
        out_be32((u32 *) BCSR1, in_be32((u32 *) BCSR1) | BCSR1_PCCEN);
}

#endif

/* MPC885ADS Boards */

#if defined(CONFIG_MPC885ADS)

#define PCMCIA_BOARD_MSG "MPC885ADS"
#define socket_get(_slot_) PCMCIA_SOCKET_KEY_5V

static inline void hardware_enable(int slot)
{
        m8xx_pcmcia_ops.hw_ctrl(slot, 1);
}

static inline void hardware_disable(int slot)
{
        m8xx_pcmcia_ops.hw_ctrl(slot, 0);
}

static inline int voltage_set(int slot, int vcc, int vpp)
{
        return m8xx_pcmcia_ops.voltage_set(slot, vcc, vpp);
}

#endif

/* ------------------------------------------------------------------------- */
/* Motorola MBX860                                                           */

#if defined(CONFIG_MBX)

#define PCMCIA_BOARD_MSG "MBX"

static int voltage_set(int slot, int vcc, int vpp)
{
        u8 reg = 0;

        switch (vcc) {
        case 0:
                break;
        case 33:
                reg |= CSR2_VCC_33;
                break;
        case 50:
                reg |= CSR2_VCC_50;
                break;
        default:
                return 1;
        }

        switch (vpp) {
        case 0:
                break;
        case 33:
        case 50:
                if (vcc == vpp)
                        reg |= CSR2_VPP_VCC;
                else
                        return 1;
                break;
        case 120:
                if ((vcc == 33) || (vcc == 50))
                        reg |= CSR2_VPP_12;
                else
                        return 1;
        default:
                return 1;
        }

        /* first, turn off all power */
        out_8((u8 *) MBX_CSR2_ADDR,
              in_8((u8 *) MBX_CSR2_ADDR) & ~(CSR2_VCC_MASK | CSR2_VPP_MASK));

        /* enable new powersettings */
        out_8((u8 *) MBX_CSR2_ADDR, in_8((u8 *) MBX_CSR2_ADDR) | reg);

        return 0;
}

#define socket_get(_slot_) PCMCIA_SOCKET_KEY_5V
#define hardware_enable(_slot_) /* No hardware to enable */
#define hardware_disable(_slot_)        /* No hardware to disable */

#endif                          /* CONFIG_MBX */

#if defined(CONFIG_PRxK)
#include <asm/cpld.h>
extern volatile fpga_pc_regs *fpga_pc;

#define PCMCIA_BOARD_MSG "MPC855T"

static int voltage_set(int slot, int vcc, int vpp)
{
        u8 reg = 0;
        u8 regread;
        cpld_regs *ccpld = get_cpld();

        switch (vcc) {
        case 0:
                break;
        case 33:
                reg |= PCMCIA_VCC_33;
                break;
        case 50:
                reg |= PCMCIA_VCC_50;
                break;
        default:
                return 1;
        }

        switch (vpp) {
        case 0:
                break;
        case 33:
        case 50:
                if (vcc == vpp)
                        reg |= PCMCIA_VPP_VCC;
                else
                        return 1;
                break;
        case 120:
                if ((vcc == 33) || (vcc == 50))
                        reg |= PCMCIA_VPP_12;
                else
                        return 1;
        default:
                return 1;
        }

        reg = reg >> (slot << 2);
        regread = in_8(&ccpld->fpga_pc_ctl);
        if (reg !=
            (regread & ((PCMCIA_VCC_MASK | PCMCIA_VPP_MASK) >> (slot << 2)))) {
                /* enable new powersettings */
                regread =
                    regread & ~((PCMCIA_VCC_MASK | PCMCIA_VPP_MASK) >>
                                (slot << 2));
                out_8(&ccpld->fpga_pc_ctl, reg | regread);
                msleep(100);
        }

        return 0;
}

#define socket_get(_slot_) PCMCIA_SOCKET_KEY_LV
#define hardware_enable(_slot_) /* No hardware to enable */
#define hardware_disable(_slot_)        /* No hardware to disable */

#endif                          /* CONFIG_PRxK */

static u32 pending_events[PCMCIA_SOCKETS_NO];
static DEFINE_SPINLOCK(pending_event_lock);

static irqreturn_t m8xx_interrupt(int irq, void *dev)
{
        struct socket_info *s;
        struct event_table *e;
        unsigned int i, events, pscr, pipr, per;
        pcmconf8xx_t *pcmcia = socket[0].pcmcia;

        dprintk("Interrupt!\n");
        /* get interrupt sources */

        pscr = in_be32(&pcmcia->pcmc_pscr);
        pipr = in_be32(&pcmcia->pcmc_pipr);
        per = in_be32(&pcmcia->pcmc_per);

        for (i = 0; i < PCMCIA_SOCKETS_NO; i++) {
                s = &socket[i];
                e = &s->events[0];
                events = 0;

                while (e->regbit) {
                        if (pscr & e->regbit)
                                events |= e->eventbit;

                        e++;
                }

                /*
                 * report only if both card detect signals are the same
                 * not too nice done,
                 * we depend on that CD2 is the bit to the left of CD1...
                 */
                if (events & SS_DETECT)
                        if (((pipr & M8XX_PCMCIA_CD2(i)) >> 1) ^
                            (pipr & M8XX_PCMCIA_CD1(i))) {
                                events &= ~SS_DETECT;
                        }
#ifdef PCMCIA_GLITCHY_CD
                /*
                 * I've experienced CD problems with my ADS board.
                 * We make an extra check to see if there was a
                 * real change of Card detection.
                 */

                if ((events & SS_DETECT) &&
                    ((pipr &
                      (M8XX_PCMCIA_CD2(i) | M8XX_PCMCIA_CD1(i))) == 0) &&
                    (s->state.Vcc | s->state.Vpp)) {
                        events &= ~SS_DETECT;
                        /*printk( "CD glitch workaround - CD = 0x%08x!\n",
                           (pipr & (M8XX_PCMCIA_CD2(i)
                           | M8XX_PCMCIA_CD1(i)))); */
                }
#endif

                /* call the handler */

                dprintk("slot %u: events = 0x%02x, pscr = 0x%08x, "
                        "pipr = 0x%08x\n", i, events, pscr, pipr);

                if (events) {
                        spin_lock(&pending_event_lock);
                        pending_events[i] |= events;
                        spin_unlock(&pending_event_lock);
                        /*
                         * Turn off RDY_L bits in the PER mask on
                         * CD interrupt receival.
                         *
                         * They can generate bad interrupts on the
                         * ACS4,8,16,32.   - marcelo
                         */
                        per &= ~M8XX_PCMCIA_RDY_L(0);
                        per &= ~M8XX_PCMCIA_RDY_L(1);

                        out_be32(&pcmcia->pcmc_per, per);

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

        /* clear the interrupt sources */
        out_be32(&pcmcia->pcmc_pscr, pscr);

        dprintk("Interrupt done.\n");

        return IRQ_HANDLED;
}

static u32 m8xx_get_graycode(u32 size)
{
        u32 k;

        for (k = 0; k < M8XX_SIZES_NO; k++)
                if (m8xx_size_to_gray[k] == size)
                        break;

        if ((k == M8XX_SIZES_NO) || (m8xx_size_to_gray[k] == -1))
                k = -1;

        return k;
}

static u32 m8xx_get_speed(u32 ns, u32 is_io, u32 bus_freq)
{
        u32 reg, clocks, psst, psl, psht;

        if (!ns) {

                /*
                 * We get called with IO maps setup to 0ns
                 * if not specified by the user.
                 * They should be 255ns.
                 */

                if (is_io)
                        ns = 255;
                else
                        ns = 100;       /* fast memory if 0 */
        }

        /*
         * In PSST, PSL, PSHT fields we tell the controller
         * timing parameters in CLKOUT clock cycles.
         * CLKOUT is the same as GCLK2_50.
         */

/* how we want to adjust the timing - in percent */

#define ADJ 180                 /* 80 % longer accesstime - to be sure */

        clocks = ((bus_freq / 1000) * ns) / 1000;
        clocks = (clocks * ADJ) / (100 * 1000);
        if (clocks >= PCMCIA_BMT_LIMIT) {
                printk("Max access time limit reached\n");
                clocks = PCMCIA_BMT_LIMIT - 1;
        }

        psst = clocks / 7;      /* setup time */
        psht = clocks / 7;      /* hold time */
        psl = (clocks * 5) / 7; /* strobe length */

        psst += clocks - (psst + psht + psl);

        reg = psst << 12;
        reg |= psl << 7;
        reg |= psht << 16;

        return reg;
}

static int m8xx_get_status(struct pcmcia_socket *sock, unsigned int *value)
{
        int lsock = container_of(sock, struct socket_info, socket)->slot;
        struct socket_info *s = &socket[lsock];
        unsigned int pipr, reg;
        pcmconf8xx_t *pcmcia = s->pcmcia;

        pipr = in_be32(&pcmcia->pcmc_pipr);

        *value = ((pipr & (M8XX_PCMCIA_CD1(lsock)
                           | M8XX_PCMCIA_CD2(lsock))) == 0) ? SS_DETECT : 0;
        *value |= (pipr & M8XX_PCMCIA_WP(lsock)) ? SS_WRPROT : 0;

        if (s->state.flags & SS_IOCARD)
                *value |= (pipr & M8XX_PCMCIA_BVD1(lsock)) ? SS_STSCHG : 0;
        else {
                *value |= (pipr & M8XX_PCMCIA_RDY(lsock)) ? SS_READY : 0;
                *value |= (pipr & M8XX_PCMCIA_BVD1(lsock)) ? SS_BATDEAD : 0;
                *value |= (pipr & M8XX_PCMCIA_BVD2(lsock)) ? SS_BATWARN : 0;
        }

        if (s->state.Vcc | s->state.Vpp)
                *value |= SS_POWERON;

        /*
         * Voltage detection:
         * This driver only supports 16-Bit pc-cards.
         * Cardbus is not handled here.
         *
         * To determine what voltage to use we must read the VS1 and VS2 pin.
         * Depending on what socket type is present,
         * different combinations mean different things.
         *
         * Card Key  Socket Key   VS1   VS2   Card         Vcc for CIS parse
         *
         * 5V        5V, LV*      NC    NC    5V only       5V (if available)
         *
         * 5V        5V, LV*      GND   NC    5 or 3.3V     as low as possible
         *
         * 5V        5V, LV*      GND   GND   5, 3.3, x.xV  as low as possible
         *
         * LV*       5V            -     -    shall not fit into socket
         *
         * LV*       LV*          GND   NC    3.3V only     3.3V
         *
         * LV*       LV*          NC    GND   x.xV          x.xV (if avail.)
         *
         * LV*       LV*          GND   GND   3.3 or x.xV   as low as possible
         *
         * *LV means Low Voltage
         *
         *
         * That gives us the following table:
         *
         * Socket    VS1  VS2   Voltage
         *
         * 5V        NC   NC    5V
         * 5V        NC   GND   none (should not be possible)
         * 5V        GND  NC    >= 3.3V
         * 5V        GND  GND   >= x.xV
         *
         * LV        NC   NC    5V   (if available)
         * LV        NC   GND   x.xV (if available)
         * LV        GND  NC    3.3V
         * LV        GND  GND   >= x.xV
         *
         * So, how do I determine if I have a 5V or a LV
         * socket on my board?  Look at the socket!
         *
         *
         * Socket with 5V key:
         * ++--------------------------------------------+
         * ||                                            |
         * ||                                           ||
         * ||                                           ||
         * |                                             |
         * +---------------------------------------------+
         *
         * Socket with LV key:
         * ++--------------------------------------------+
         * ||                                            |
         * |                                            ||
         * |                                            ||
         * |                                             |
         * +---------------------------------------------+
         *
         *
         * With other words - LV only cards does not fit
         * into the 5V socket!
         */

        /* read out VS1 and VS2 */

        reg = (pipr & M8XX_PCMCIA_VS_MASK(lsock))
            >> M8XX_PCMCIA_VS_SHIFT(lsock);

        if (socket_get(lsock) == PCMCIA_SOCKET_KEY_LV) {
                switch (reg) {
                case 1:
                        *value |= SS_3VCARD;
                        break;  /* GND, NC - 3.3V only */
                case 2:
                        *value |= SS_XVCARD;
                        break;  /* NC. GND - x.xV only */
                };
        }

        dprintk("GetStatus(%d) = %#2.2x\n", lsock, *value);
        return 0;
}

static int m8xx_set_socket(struct pcmcia_socket *sock, socket_state_t * state)
{
        int lsock = container_of(sock, struct socket_info, socket)->slot;
        struct socket_info *s = &socket[lsock];
        struct event_table *e;
        unsigned int reg;
        unsigned long flags;
        pcmconf8xx_t *pcmcia = socket[0].pcmcia;

        dprintk("SetSocket(%d, flags %#3.3x, Vcc %d, Vpp %d, "
                "io_irq %d, csc_mask %#2.2x)\n", lsock, state->flags,
                state->Vcc, state->Vpp, state->io_irq, state->csc_mask);

        /* First, set voltage - bail out if invalid */
        if (voltage_set(lsock, state->Vcc, state->Vpp))
                return -EINVAL;

        /* Take care of reset... */
        if (state->flags & SS_RESET)
                out_be32(M8XX_PGCRX(lsock), in_be32(M8XX_PGCRX(lsock)) | M8XX_PGCRX_CXRESET);   /* active high */
        else
                out_be32(M8XX_PGCRX(lsock),
                         in_be32(M8XX_PGCRX(lsock)) & ~M8XX_PGCRX_CXRESET);

        /* ... and output enable. */

        /* The CxOE signal is connected to a 74541 on the ADS.
           I guess most other boards used the ADS as a reference.
           I tried to control the CxOE signal with SS_OUTPUT_ENA,
           but the reset signal seems connected via the 541.
           If the CxOE is left high are some signals tristated and
           no pullups are present -> the cards act weird.
           So right now the buffers are enabled if the power is on. */

        if (state->Vcc || state->Vpp)
                out_be32(M8XX_PGCRX(lsock), in_be32(M8XX_PGCRX(lsock)) & ~M8XX_PGCRX_CXOE);     /* active low */
        else
                out_be32(M8XX_PGCRX(lsock),
                         in_be32(M8XX_PGCRX(lsock)) | M8XX_PGCRX_CXOE);

        /*
         * We'd better turn off interrupts before
         * we mess with the events-table..
         */

        spin_lock_irqsave(&events_lock, flags);

        /*
         * Play around with the interrupt mask to be able to
         * give the events the generic pcmcia driver wants us to.
         */

        e = &s->events[0];
        reg = 0;

        if (state->csc_mask & SS_DETECT) {
                e->eventbit = SS_DETECT;
                reg |= e->regbit = (M8XX_PCMCIA_CD2(lsock)
                                    | M8XX_PCMCIA_CD1(lsock));
                e++;
        }
        if (state->flags & SS_IOCARD) {
                /*
                 * I/O card
                 */
                if (state->csc_mask & SS_STSCHG) {
                        e->eventbit = SS_STSCHG;
                        reg |= e->regbit = M8XX_PCMCIA_BVD1(lsock);
                        e++;
                }
                /*
                 * If io_irq is non-zero we should enable irq.
                 */
                if (state->io_irq) {
                        out_be32(M8XX_PGCRX(lsock),
                                 in_be32(M8XX_PGCRX(lsock)) |
                                 mk_int_int_mask(s->hwirq) << 24);
                        /*
                         * Strange thing here:
                         * The manual does not tell us which interrupt
                         * the sources generate.
                         * Anyhow, I found out that RDY_L generates IREQLVL.
                         *
                         * We use level triggerd interrupts, and they don't
                         * have to be cleared in PSCR in the interrupt handler.
                         */
                        reg |= M8XX_PCMCIA_RDY_L(lsock);
                } else
                        out_be32(M8XX_PGCRX(lsock),
                                 in_be32(M8XX_PGCRX(lsock)) & 0x00ffffff);
        } else {
                /*
                 * Memory card
                 */
                if (state->csc_mask & SS_BATDEAD) {
                        e->eventbit = SS_BATDEAD;
                        reg |= e->regbit = M8XX_PCMCIA_BVD1(lsock);
                        e++;
                }
                if (state->csc_mask & SS_BATWARN) {
                        e->eventbit = SS_BATWARN;
                        reg |= e->regbit = M8XX_PCMCIA_BVD2(lsock);
                        e++;
                }
                /* What should I trigger on - low/high,raise,fall? */
                if (state->csc_mask & SS_READY) {
                        e->eventbit = SS_READY;
                        reg |= e->regbit = 0;   //??
                        e++;
                }
        }

        e->regbit = 0;          /* terminate list */

        /*
         * Clear the status changed .
         * Port A and Port B share the same port.
         * Writing ones will clear the bits.
         */

        out_be32(&pcmcia->pcmc_pscr, reg);

        /*
         * Write the mask.
         * Port A and Port B share the same port.
         * Need for read-modify-write.
         * Ones will enable the interrupt.
         */

        reg |=
            in_be32(&pcmcia->
                    pcmc_per) & (M8XX_PCMCIA_MASK(0) | M8XX_PCMCIA_MASK(1));
        out_be32(&pcmcia->pcmc_per, reg);

        spin_unlock_irqrestore(&events_lock, flags);

        /* copy the struct and modify the copy */

        s->state = *state;

        return 0;
}

static int m8xx_set_io_map(struct pcmcia_socket *sock, struct pccard_io_map *io)
{
        int lsock = container_of(sock, struct socket_info, socket)->slot;

        struct socket_info *s = &socket[lsock];
        struct pcmcia_win *w;
        unsigned int reg, winnr;
        pcmconf8xx_t *pcmcia = s->pcmcia;

#define M8XX_SIZE (io->stop - io->start + 1)
#define M8XX_BASE (PCMCIA_IO_WIN_BASE + io->start)

        dprintk("SetIOMap(%d, %d, %#2.2x, %d ns, "
                "%#4.4x-%#4.4x)\n", lsock, io->map, io->flags,
                io->speed, io->start, io->stop);

        if ((io->map >= PCMCIA_IO_WIN_NO) || (io->start > 0xffff)
            || (io->stop > 0xffff) || (io->stop < io->start))
                return -EINVAL;

        if ((reg = m8xx_get_graycode(M8XX_SIZE)) == -1)
                return -EINVAL;

        if (io->flags & MAP_ACTIVE) {

                dprintk("io->flags & MAP_ACTIVE\n");

                winnr = (PCMCIA_MEM_WIN_NO * PCMCIA_SOCKETS_NO)
                    + (lsock * PCMCIA_IO_WIN_NO) + io->map;

                /* setup registers */

                w = (void *)&pcmcia->pcmc_pbr0;
                w += winnr;

                out_be32(&w->or, 0);    /* turn off window first */

                out_be32(&w->br, M8XX_BASE);

                reg <<= 27;
                reg |= M8XX_PCMCIA_POR_IO | (lsock << 2);

                reg |= m8xx_get_speed(io->speed, 1, s->bus_freq);

                if (io->flags & MAP_WRPROT)
                        reg |= M8XX_PCMCIA_POR_WRPROT;

                /*if(io->flags & (MAP_16BIT | MAP_AUTOSZ)) */
                if (io->flags & MAP_16BIT)
                        reg |= M8XX_PCMCIA_POR_16BIT;

                if (io->flags & MAP_ACTIVE)
                        reg |= M8XX_PCMCIA_POR_VALID;

                out_be32(&w->or, reg);

                dprintk("Socket %u: Mapped io window %u at %#8.8x, "
                        "OR = %#8.8x.\n", lsock, io->map, w->br, w->or);
        } else {
                /* shutdown IO window */
                winnr = (PCMCIA_MEM_WIN_NO * PCMCIA_SOCKETS_NO)
                    + (lsock * PCMCIA_IO_WIN_NO) + io->map;

                /* setup registers */

                w = (void *)&pcmcia->pcmc_pbr0;
                w += winnr;

                out_be32(&w->or, 0);    /* turn off window */
                out_be32(&w->br, 0);    /* turn off base address */

                dprintk("Socket %u: Unmapped io window %u at %#8.8x, "
                        "OR = %#8.8x.\n", lsock, io->map, w->br, w->or);
        }

        /* copy the struct and modify the copy */
        s->io_win[io->map] = *io;
        s->io_win[io->map].flags &= (MAP_WRPROT | MAP_16BIT | MAP_ACTIVE);
        dprintk("SetIOMap exit\n");

        return 0;
}

static int m8xx_set_mem_map(struct pcmcia_socket *sock,
                            struct pccard_mem_map *mem)
{
        int lsock = container_of(sock, struct socket_info, socket)->slot;
        struct socket_info *s = &socket[lsock];
        struct pcmcia_win *w;
        struct pccard_mem_map *old;
        unsigned int reg, winnr;
        pcmconf8xx_t *pcmcia = s->pcmcia;

        dprintk("SetMemMap(%d, %d, %#2.2x, %d ns, "
                "%#5.5lx, %#5.5x)\n", lsock, mem->map, mem->flags,
                mem->speed, mem->static_start, mem->card_start);

        if ((mem->map >= PCMCIA_MEM_WIN_NO)
//          || ((mem->s) >= PCMCIA_MEM_WIN_SIZE)
            || (mem->card_start >= 0x04000000)
            || (mem->static_start & 0xfff)      /* 4KByte resolution */
            ||(mem->card_start & 0xfff))
                return -EINVAL;

        if ((reg = m8xx_get_graycode(PCMCIA_MEM_WIN_SIZE)) == -1) {
                printk("Cannot set size to 0x%08x.\n", PCMCIA_MEM_WIN_SIZE);
                return -EINVAL;
        }
        reg <<= 27;

        winnr = (lsock * PCMCIA_MEM_WIN_NO) + mem->map;

        /* Setup the window in the pcmcia controller */

        w = (void *)&pcmcia->pcmc_pbr0;
        w += winnr;

        reg |= lsock << 2;

        reg |= m8xx_get_speed(mem->speed, 0, s->bus_freq);

        if (mem->flags & MAP_ATTRIB)
                reg |= M8XX_PCMCIA_POR_ATTRMEM;

        if (mem->flags & MAP_WRPROT)
                reg |= M8XX_PCMCIA_POR_WRPROT;

        if (mem->flags & MAP_16BIT)
                reg |= M8XX_PCMCIA_POR_16BIT;

        if (mem->flags & MAP_ACTIVE)
                reg |= M8XX_PCMCIA_POR_VALID;

        out_be32(&w->or, reg);

        dprintk("Socket %u: Mapped memory window %u at %#8.8x, "
                "OR = %#8.8x.\n", lsock, mem->map, w->br, w->or);

        if (mem->flags & MAP_ACTIVE) {
                /* get the new base address */
                mem->static_start = PCMCIA_MEM_WIN_BASE +
                    (PCMCIA_MEM_WIN_SIZE * winnr)
                    + mem->card_start;
        }

        dprintk("SetMemMap(%d, %d, %#2.2x, %d ns, "
                "%#5.5lx, %#5.5x)\n", lsock, mem->map, mem->flags,
                mem->speed, mem->static_start, mem->card_start);

        /* copy the struct and modify the copy */

        old = &s->mem_win[mem->map];

        *old = *mem;
        old->flags &= (MAP_ATTRIB | MAP_WRPROT | MAP_16BIT | MAP_ACTIVE);

        return 0;
}

static int m8xx_sock_init(struct pcmcia_socket *sock)
{
        int i;
        pccard_io_map io = { 0, 0, 0, 0, 1 };
        pccard_mem_map mem = { 0, 0, 0, 0, 0, 0 };

        dprintk("sock_init(%d)\n", s);

        m8xx_set_socket(sock, &dead_socket);
        for (i = 0; i < PCMCIA_IO_WIN_NO; i++) {
                io.map = i;
                m8xx_set_io_map(sock, &io);
        }
        for (i = 0; i < PCMCIA_MEM_WIN_NO; i++) {
                mem.map = i;
                m8xx_set_mem_map(sock, &mem);
        }

        return 0;

}

static int m8xx_sock_suspend(struct pcmcia_socket *sock)
{
        return m8xx_set_socket(sock, &dead_socket);
}

static struct pccard_operations m8xx_services = {
        .init = m8xx_sock_init,
        .suspend = m8xx_sock_suspend,
        .get_status = m8xx_get_status,
        .set_socket = m8xx_set_socket,
        .set_io_map = m8xx_set_io_map,
        .set_mem_map = m8xx_set_mem_map,
};

static int __init m8xx_probe(struct of_device *ofdev,
                             const struct of_device_id *match)
{
        struct pcmcia_win *w;
        unsigned int i, m, hwirq;
        pcmconf8xx_t *pcmcia;
        int status;
        struct device_node *np = ofdev->node;

        pcmcia_info("%s\n", version);

        pcmcia = of_iomap(np, 0);
        if (pcmcia == NULL)
                return -EINVAL;

        pcmcia_schlvl = irq_of_parse_and_map(np, 0);
        hwirq = irq_map[pcmcia_schlvl].hwirq;
        if (pcmcia_schlvl < 0) {
                iounmap(pcmcia);
                return -EINVAL;
        }

        m8xx_pgcrx[0] = &pcmcia->pcmc_pgcra;
        m8xx_pgcrx[1] = &pcmcia->pcmc_pgcrb;

        pcmcia_info(PCMCIA_BOARD_MSG " using " PCMCIA_SLOT_MSG
                    " with IRQ %u  (%d). \n", pcmcia_schlvl, hwirq);

        /* Configure Status change interrupt */

        if (request_irq(pcmcia_schlvl, m8xx_interrupt, IRQF_SHARED,
                        driver_name, socket)) {
                pcmcia_error("Cannot allocate IRQ %u for SCHLVL!\n",
                             pcmcia_schlvl);
                iounmap(pcmcia);
                return -1;
        }

        w = (void *)&pcmcia->pcmc_pbr0;

        out_be32(&pcmcia->pcmc_pscr, M8XX_PCMCIA_MASK(0) | M8XX_PCMCIA_MASK(1));
        clrbits32(&pcmcia->pcmc_per, M8XX_PCMCIA_MASK(0) | M8XX_PCMCIA_MASK(1));

        /* connect interrupt and disable CxOE */

        out_be32(M8XX_PGCRX(0),
                 M8XX_PGCRX_CXOE | (mk_int_int_mask(hwirq) << 16));
        out_be32(M8XX_PGCRX(1),
                 M8XX_PGCRX_CXOE | (mk_int_int_mask(hwirq) << 16));

        /* intialize the fixed memory windows */

        for (i = 0; i < PCMCIA_SOCKETS_NO; i++) {
                for (m = 0; m < PCMCIA_MEM_WIN_NO; m++) {
                        out_be32(&w->br, PCMCIA_MEM_WIN_BASE +
                                 (PCMCIA_MEM_WIN_SIZE
                                  * (m + i * PCMCIA_MEM_WIN_NO)));

                        out_be32(&w->or, 0);    /* set to not valid */

                        w++;
                }
        }

        /* turn off voltage */
        voltage_set(0, 0, 0);
        voltage_set(1, 0, 0);

        /* Enable external hardware */
        hardware_enable(0);
        hardware_enable(1);

        for (i = 0; i < PCMCIA_SOCKETS_NO; i++) {
                socket[i].slot = i;
                socket[i].socket.owner = THIS_MODULE;
                socket[i].socket.features =
                    SS_CAP_PCCARD | SS_CAP_MEM_ALIGN | SS_CAP_STATIC_MAP;
                socket[i].socket.irq_mask = 0x000;
                socket[i].socket.map_size = 0x1000;
                socket[i].socket.io_offset = 0;
                socket[i].socket.pci_irq = pcmcia_schlvl;
                socket[i].socket.ops = &m8xx_services;
                socket[i].socket.resource_ops = &pccard_nonstatic_ops;
                socket[i].socket.cb_dev = NULL;
                socket[i].socket.dev.parent = &ofdev->dev;
                socket[i].pcmcia = pcmcia;
                socket[i].bus_freq = ppc_proc_freq;
                socket[i].hwirq = hwirq;

        }

        for (i = 0; i < PCMCIA_SOCKETS_NO; i++) {
                status = pcmcia_register_socket(&socket[i].socket);
                if (status < 0)
                        pcmcia_error("Socket register failed\n");
        }

        return 0;
}

static int m8xx_remove(struct of_device *ofdev)
{
        u32 m, i;
        struct pcmcia_win *w;
        pcmconf8xx_t *pcmcia = socket[0].pcmcia;

        for (i = 0; i < PCMCIA_SOCKETS_NO; i++) {
                w = (void *)&pcmcia->pcmc_pbr0;

                out_be32(&pcmcia->pcmc_pscr, M8XX_PCMCIA_MASK(i));
                out_be32(&pcmcia->pcmc_per,
                         in_be32(&pcmcia->pcmc_per) & ~M8XX_PCMCIA_MASK(i));

                /* turn off interrupt and disable CxOE */
                out_be32(M8XX_PGCRX(i), M8XX_PGCRX_CXOE);

                /* turn off memory windows */
                for (m = 0; m < PCMCIA_MEM_WIN_NO; m++) {
                        out_be32(&w->or, 0);    /* set to not valid */
                        w++;
                }

                /* turn off voltage */
                voltage_set(i, 0, 0);

                /* disable external hardware */
                hardware_disable(i);
        }
        for (i = 0; i < PCMCIA_SOCKETS_NO; i++)
                pcmcia_unregister_socket(&socket[i].socket);
        iounmap(pcmcia);

        free_irq(pcmcia_schlvl, NULL);

        return 0;
}

#ifdef CONFIG_PM
static int m8xx_suspend(struct platform_device *pdev, pm_message_t state)
{
        return pcmcia_socket_dev_suspend(&pdev->dev, state);
}

static int m8xx_resume(struct platform_device *pdev)
{
        return pcmcia_socket_dev_resume(&pdev->dev);
}
#else
#define m8xx_suspend NULL
#define m8xx_resume NULL
#endif

static struct of_device_id m8xx_pcmcia_match[] = {
        {
         .type = "pcmcia",
         .compatible = "fsl,pq-pcmcia",
         },
        {},
};

MODULE_DEVICE_TABLE(of, m8xx_pcmcia_match);

static struct of_platform_driver m8xx_pcmcia_driver = {
        .name = driver_name,
        .match_table = m8xx_pcmcia_match,
        .probe = m8xx_probe,
        .remove = m8xx_remove,
        .suspend = m8xx_suspend,
        .resume = m8xx_resume,
};

static int __init m8xx_init(void)
{
        return of_register_platform_driver(&m8xx_pcmcia_driver);
}

static void __exit m8xx_exit(void)
{
        of_unregister_platform_driver(&m8xx_pcmcia_driver);
}

module_init(m8xx_init);
module_exit(m8xx_exit);