bfin_gpio.c

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/*
 * GPIO Abstraction Layer
 *
 * Copyright 2006-2010 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/blackfin.h>
#include <asm/gpio.h>
#include <asm/portmux.h>
#include <linux/irq.h>
#include <asm/irq_handler.h>

#if ANOMALY_05000311 || ANOMALY_05000323
enum {
    AWA_data = SYSCR,
    AWA_data_clear = SYSCR,
    AWA_data_set = SYSCR,
    AWA_toggle = SYSCR,
    AWA_maska = BFIN_UART_SCR,
    AWA_maska_clear = BFIN_UART_SCR,
    AWA_maska_set = BFIN_UART_SCR,
    AWA_maska_toggle = BFIN_UART_SCR,
    AWA_maskb = BFIN_UART_GCTL,
    AWA_maskb_clear = BFIN_UART_GCTL,
    AWA_maskb_set = BFIN_UART_GCTL,
    AWA_maskb_toggle = BFIN_UART_GCTL,
    AWA_dir = SPORT1_STAT,
    AWA_polar = SPORT1_STAT,
    AWA_edge = SPORT1_STAT,
    AWA_both = SPORT1_STAT,
#if ANOMALY_05000311
    AWA_inen = TIMER_ENABLE,
#elif ANOMALY_05000323
    AWA_inen = DMA1_1_CONFIG,
#endif
};
    /* Anomaly Workaround */
#define AWA_DUMMY_READ(name) bfin_read16(AWA_ ## name)
#else
#define AWA_DUMMY_READ(...)  do { } while (0)
#endif

static struct gpio_port_t * const gpio_array[] = {
#if defined(BF533_FAMILY) || defined(BF538_FAMILY)
    (struct gpio_port_t *) FIO_FLAG_D,
#elif defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
    (struct gpio_port_t *) PORTFIO,
    (struct gpio_port_t *) PORTGIO,
    (struct gpio_port_t *) PORTHIO,
#elif defined(BF561_FAMILY)
    (struct gpio_port_t *) FIO0_FLAG_D,
    (struct gpio_port_t *) FIO1_FLAG_D,
    (struct gpio_port_t *) FIO2_FLAG_D,
#elif defined(CONFIG_BF54x) || defined(CONFIG_BF60x) 
    (struct gpio_port_t *)PORTA_FER,
    (struct gpio_port_t *)PORTB_FER,
    (struct gpio_port_t *)PORTC_FER,
    (struct gpio_port_t *)PORTD_FER,
    (struct gpio_port_t *)PORTE_FER,
    (struct gpio_port_t *)PORTF_FER,
    (struct gpio_port_t *)PORTG_FER,
# if defined(CONFIG_BF54x)
    (struct gpio_port_t *)PORTH_FER,
    (struct gpio_port_t *)PORTI_FER,
    (struct gpio_port_t *)PORTJ_FER,
# endif
#else
# error no gpio arrays defined
#endif
};

#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
static unsigned short * const port_fer[] = {
    (unsigned short *) PORTF_FER,
    (unsigned short *) PORTG_FER,
    (unsigned short *) PORTH_FER,
};

# if !defined(BF537_FAMILY)
static unsigned short * const port_mux[] = {
    (unsigned short *) PORTF_MUX,
    (unsigned short *) PORTG_MUX,
    (unsigned short *) PORTH_MUX,
};

static const
u8 pmux_offset[][16] = {
#  if defined(CONFIG_BF52x)
    { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 4, 6, 8, 8, 10, 10 }, /* PORTF */
    { 0, 0, 0, 0, 0, 2, 2, 4, 4, 6, 8, 10, 10, 10, 12, 12 }, /* PORTG */
    { 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 4, 4, 4, 4, 4, 4 }, /* PORTH */
#  elif defined(CONFIG_BF51x)
    { 0, 2, 2, 2, 2, 2, 2, 4, 6, 6, 6, 8, 8, 8, 8, 10 }, /* PORTF */
    { 0, 0, 0, 2, 4, 6, 6, 6, 8, 10, 10, 12, 14, 14, 14, 14 }, /* PORTG */
    { 0, 0, 0, 0, 2, 2, 4, 6, 10, 10, 10, 10, 10, 10, 10, 10 }, /* PORTH */
#  endif
};
# endif

#elif defined(BF538_FAMILY)
static unsigned short * const port_fer[] = {
    (unsigned short *) PORTCIO_FER,
    (unsigned short *) PORTDIO_FER,
    (unsigned short *) PORTEIO_FER,
};
#endif

#define RESOURCE_LABEL_SIZE 16

static struct str_ident {
    char name[RESOURCE_LABEL_SIZE];
} str_ident[MAX_RESOURCES];

#if defined(CONFIG_PM)
static struct gpio_port_s gpio_bank_saved[GPIO_BANK_NUM];
# ifdef BF538_FAMILY
static unsigned short port_fer_saved[3];
# endif
#endif

static void gpio_error(unsigned gpio)
{
    printk(KERN_ERR "bfin-gpio: GPIO %d wasn't requested!\n", gpio);
}

static void set_label(unsigned short ident, const char *label)
{
    if (label) {
        strncpy(str_ident[ident].name, label,
             RESOURCE_LABEL_SIZE);
        str_ident[ident].name[RESOURCE_LABEL_SIZE - 1] = 0;
    }
}

static char *get_label(unsigned short ident)
{
    return (*str_ident[ident].name ? str_ident[ident].name : "UNKNOWN");
}

static int cmp_label(unsigned short ident, const char *label)
{
    if (label == NULL) {
        dump_stack();
        printk(KERN_ERR "Please provide none-null label\n");
    }

    if (label)
        return strcmp(str_ident[ident].name, label);
    else
        return -EINVAL;
}

#define map_entry(m, i)      reserved_##m##_map[gpio_bank(i)]
#define is_reserved(m, i, e) (map_entry(m, i) & gpio_bit(i))
#define reserve(m, i)        (map_entry(m, i) |= gpio_bit(i))
#define unreserve(m, i)      (map_entry(m, i) &= ~gpio_bit(i))
#define DECLARE_RESERVED_MAP(m, c) static unsigned short reserved_##m##_map[c]

DECLARE_RESERVED_MAP(gpio, GPIO_BANK_NUM);
DECLARE_RESERVED_MAP(peri, DIV_ROUND_UP(MAX_RESOURCES, GPIO_BANKSIZE));
DECLARE_RESERVED_MAP(gpio_irq, GPIO_BANK_NUM);

inline int check_gpio(unsigned gpio)
{
#if defined(CONFIG_BF54x)
    if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15
        || gpio == GPIO_PH14 || gpio == GPIO_PH15
        || gpio == GPIO_PJ14 || gpio == GPIO_PJ15)
        return -EINVAL;
#endif
    if (gpio >= MAX_BLACKFIN_GPIOS)
        return -EINVAL;
    return 0;
}

static void port_setup(unsigned gpio, unsigned short usage)
{
#if defined(BF538_FAMILY)
    /*
     * BF538/9 Port C,D and E are special.
     * Inverted PORT_FER polarity on CDE and no PORF_FER on F
     * Regular PORT F GPIOs are handled here, CDE are exclusively
     * managed by GPIOLIB
     */

    if (gpio < MAX_BLACKFIN_GPIOS || gpio >= MAX_RESOURCES)
        return;

    gpio -= MAX_BLACKFIN_GPIOS;

    if (usage == GPIO_USAGE)
        *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
    else
        *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
    SSYNC();
    return;
#endif

    if (check_gpio(gpio))
        return;

#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
    if (usage == GPIO_USAGE)
        *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
    else
        *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
    SSYNC();
#elif defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
    if (usage == GPIO_USAGE)
        gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
    else
        gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio);
    SSYNC();
#endif
}

#ifdef BF537_FAMILY
static const s8 port_mux[] = {
    [GPIO_PF0] = 3,
    [GPIO_PF1] = 3,
    [GPIO_PF2] = 4,
    [GPIO_PF3] = 4,
    [GPIO_PF4] = 5,
    [GPIO_PF5] = 6,
    [GPIO_PF6] = 7,
    [GPIO_PF7] = 8,
    [GPIO_PF8 ... GPIO_PF15] = -1,
    [GPIO_PG0 ... GPIO_PG7] = -1,
    [GPIO_PG8] = 9,
    [GPIO_PG9] = 9,
    [GPIO_PG10] = 10,
    [GPIO_PG11] = 10,
    [GPIO_PG12] = 10,
    [GPIO_PG13] = 11,
    [GPIO_PG14] = 11,
    [GPIO_PG15] = 11,
    [GPIO_PH0 ... GPIO_PH15] = -1,
    [PORT_PJ0 ... PORT_PJ3] = -1,
    [PORT_PJ4] = 1,
    [PORT_PJ5] = 1,
    [PORT_PJ6 ... PORT_PJ9] = -1,
    [PORT_PJ10] = 0,
    [PORT_PJ11] = 0,
};

static int portmux_group_check(unsigned short per)
{
    u16 ident = P_IDENT(per);
    u16 function = P_FUNCT2MUX(per);
    s8 offset = port_mux[ident];
    u16 m, pmux, pfunc;

    if (offset < 0)
        return 0;

    pmux = bfin_read_PORT_MUX();
    for (m = 0; m < ARRAY_SIZE(port_mux); ++m) {
        if (m == ident)
            continue;
        if (port_mux[m] != offset)
            continue;
        if (!is_reserved(peri, m, 1))
            continue;

        if (offset == 1)
            pfunc = (pmux >> offset) & 3;
        else
            pfunc = (pmux >> offset) & 1;
        if (pfunc != function) {
            pr_err("pin group conflict! request pin %d func %d conflict with pin %d func %d\n",
                ident, function, m, pfunc);
            return -EINVAL;
        }
    }

    return 0;
}

static void portmux_setup(unsigned short per)
{
    u16 ident = P_IDENT(per);
    u16 function = P_FUNCT2MUX(per);
    s8 offset = port_mux[ident];
    u16 pmux;

    if (offset == -1)
        return;

    pmux = bfin_read_PORT_MUX();
    if (offset != 1)
        pmux &= ~(1 << offset);
    else
        pmux &= ~(3 << 1);
    pmux |= (function << offset);
    bfin_write_PORT_MUX(pmux);
}
#elif defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
inline void portmux_setup(unsigned short per)
{
    u16 ident = P_IDENT(per);
    u16 function = P_FUNCT2MUX(per);
    u32 pmux;

    pmux = gpio_array[gpio_bank(ident)]->port_mux;

    pmux &= ~(0x3 << (2 * gpio_sub_n(ident)));
    pmux |= (function & 0x3) << (2 * gpio_sub_n(ident));

    gpio_array[gpio_bank(ident)]->port_mux = pmux;
}

inline u16 get_portmux(unsigned short per)
{
    u16 ident = P_IDENT(per);
    u32 pmux = gpio_array[gpio_bank(ident)]->port_mux;
    return (pmux >> (2 * gpio_sub_n(ident)) & 0x3);
}
static int portmux_group_check(unsigned short per)
{
    return 0;
}
#elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
static int portmux_group_check(unsigned short per)
{
    u16 ident = P_IDENT(per);
    u16 function = P_FUNCT2MUX(per);
    u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)];
    u16 pin, gpiopin, pfunc;

    for (pin = 0; pin < GPIO_BANKSIZE; ++pin) {
        if (offset != pmux_offset[gpio_bank(ident)][pin])
            continue;

        gpiopin = gpio_bank(ident) * GPIO_BANKSIZE + pin;
        if (gpiopin == ident)
            continue;
        if (!is_reserved(peri, gpiopin, 1))
            continue;

        pfunc = *port_mux[gpio_bank(ident)];
        pfunc = (pfunc >> offset) & 3;
        if (pfunc != function) {
            pr_err("pin group conflict! request pin %d func %d conflict with pin %d func %d\n",
                ident, function, gpiopin, pfunc);
            return -EINVAL;
        }
    }

    return 0;
}

inline void portmux_setup(unsigned short per)
{
    u16 ident = P_IDENT(per);
    u16 function = P_FUNCT2MUX(per);
    u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)];
    u16 pmux;

    pmux = *port_mux[gpio_bank(ident)];
    if  (((pmux >> offset) & 3) == function)
        return;
    pmux &= ~(3 << offset);
    pmux |= (function & 3) << offset;
    *port_mux[gpio_bank(ident)] = pmux;
    SSYNC();
}
#else
# define portmux_setup(...)  do { } while (0)
static int portmux_group_check(unsigned short per)
{
    return 0;
}
#endif

#if !(defined(CONFIG_BF54x) || defined(CONFIG_BF60x))
/***********************************************************
*
* FUNCTIONS: Blackfin General Purpose Ports Access Functions
*
* INPUTS/OUTPUTS:
* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
*
*
* DESCRIPTION: These functions abstract direct register access
*              to Blackfin processor General Purpose
*              Ports Regsiters
*
* CAUTION: These functions do not belong to the GPIO Driver API
*************************************************************
* MODIFICATION HISTORY :
**************************************************************/

/* Set a specific bit */

#define SET_GPIO(name) \
void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
{ \
    unsigned long flags; \
    flags = hard_local_irq_save(); \
    if (arg) \
        gpio_array[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
    else \
        gpio_array[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
    AWA_DUMMY_READ(name); \
    hard_local_irq_restore(flags); \
} \
EXPORT_SYMBOL(set_gpio_ ## name);

SET_GPIO(dir)   /* set_gpio_dir() */
SET_GPIO(inen)  /* set_gpio_inen() */
SET_GPIO(polar) /* set_gpio_polar() */
SET_GPIO(edge)  /* set_gpio_edge() */
SET_GPIO(both)  /* set_gpio_both() */


#define SET_GPIO_SC(name) \
void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
{ \
    unsigned long flags; \
    if (ANOMALY_05000311 || ANOMALY_05000323) \
        flags = hard_local_irq_save(); \
    if (arg) \
        gpio_array[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
    else \
        gpio_array[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
    if (ANOMALY_05000311 || ANOMALY_05000323) { \
        AWA_DUMMY_READ(name); \
        hard_local_irq_restore(flags); \
    } \
} \
EXPORT_SYMBOL(set_gpio_ ## name);

SET_GPIO_SC(maska)
SET_GPIO_SC(maskb)
SET_GPIO_SC(data)

void set_gpio_toggle(unsigned gpio)
{
    unsigned long flags;
    if (ANOMALY_05000311 || ANOMALY_05000323)
        flags = hard_local_irq_save();
    gpio_array[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
    if (ANOMALY_05000311 || ANOMALY_05000323) {
        AWA_DUMMY_READ(toggle);
        hard_local_irq_restore(flags);
    }
}
EXPORT_SYMBOL(set_gpio_toggle);


/*Set current PORT date (16-bit word)*/

#define SET_GPIO_P(name) \
void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
{ \
    unsigned long flags; \
    if (ANOMALY_05000311 || ANOMALY_05000323) \
        flags = hard_local_irq_save(); \
    gpio_array[gpio_bank(gpio)]->name = arg; \
    if (ANOMALY_05000311 || ANOMALY_05000323) { \
        AWA_DUMMY_READ(name); \
        hard_local_irq_restore(flags); \
    } \
} \
EXPORT_SYMBOL(set_gpiop_ ## name);

SET_GPIO_P(data)
SET_GPIO_P(dir)
SET_GPIO_P(inen)
SET_GPIO_P(polar)
SET_GPIO_P(edge)
SET_GPIO_P(both)
SET_GPIO_P(maska)
SET_GPIO_P(maskb)

/* Get a specific bit */
#define GET_GPIO(name) \
unsigned short get_gpio_ ## name(unsigned gpio) \
{ \
    unsigned long flags; \
    unsigned short ret; \
    if (ANOMALY_05000311 || ANOMALY_05000323) \
        flags = hard_local_irq_save(); \
    ret = 0x01 & (gpio_array[gpio_bank(gpio)]->name >> gpio_sub_n(gpio)); \
    if (ANOMALY_05000311 || ANOMALY_05000323) { \
        AWA_DUMMY_READ(name); \
        hard_local_irq_restore(flags); \
    } \
    return ret; \
} \
EXPORT_SYMBOL(get_gpio_ ## name);

GET_GPIO(data)
GET_GPIO(dir)
GET_GPIO(inen)
GET_GPIO(polar)
GET_GPIO(edge)
GET_GPIO(both)
GET_GPIO(maska)
GET_GPIO(maskb)

/*Get current PORT date (16-bit word)*/

#define GET_GPIO_P(name) \
unsigned short get_gpiop_ ## name(unsigned gpio) \
{ \
    unsigned long flags; \
    unsigned short ret; \
    if (ANOMALY_05000311 || ANOMALY_05000323) \
        flags = hard_local_irq_save(); \
    ret = (gpio_array[gpio_bank(gpio)]->name); \
    if (ANOMALY_05000311 || ANOMALY_05000323) { \
        AWA_DUMMY_READ(name); \
        hard_local_irq_restore(flags); \
    } \
    return ret; \
} \
EXPORT_SYMBOL(get_gpiop_ ## name);

GET_GPIO_P(data)
GET_GPIO_P(dir)
GET_GPIO_P(inen)
GET_GPIO_P(polar)
GET_GPIO_P(edge)
GET_GPIO_P(both)
GET_GPIO_P(maska)
GET_GPIO_P(maskb)


#ifdef CONFIG_PM
DECLARE_RESERVED_MAP(wakeup, GPIO_BANK_NUM);

static const unsigned int sic_iwr_irqs[] = {
#if defined(BF533_FAMILY)
    IRQ_PROG_INTB
#elif defined(BF537_FAMILY)
    IRQ_PF_INTB_WATCH, IRQ_PORTG_INTB, IRQ_PH_INTB_MAC_TX
#elif defined(BF538_FAMILY)
    IRQ_PORTF_INTB
#elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
    IRQ_PORTF_INTB, IRQ_PORTG_INTB, IRQ_PORTH_INTB
#elif defined(BF561_FAMILY)
    IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB
#else
# error no SIC_IWR defined
#endif
};

/***********************************************************
*
* FUNCTIONS: Blackfin PM Setup API
*
* INPUTS/OUTPUTS:
* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
* type -
*   PM_WAKE_RISING
*   PM_WAKE_FALLING
*   PM_WAKE_HIGH
*   PM_WAKE_LOW
*   PM_WAKE_BOTH_EDGES
*
* DESCRIPTION: Blackfin PM Driver API
*
* CAUTION:
*************************************************************
* MODIFICATION HISTORY :
**************************************************************/
int gpio_pm_wakeup_ctrl(unsigned gpio, unsigned ctrl)
{
    unsigned long flags;

    if (check_gpio(gpio) < 0)
        return -EINVAL;

    flags = hard_local_irq_save();
    if (ctrl)
        reserve(wakeup, gpio);
    else
        unreserve(wakeup, gpio);

    set_gpio_maskb(gpio, ctrl);
    hard_local_irq_restore(flags);

    return 0;
}

int bfin_pm_standby_ctrl(unsigned ctrl)
{
    u16 bank, mask, i;

    for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
        mask = map_entry(wakeup, i);
        bank = gpio_bank(i);

        if (mask)
            bfin_internal_set_wake(sic_iwr_irqs[bank], ctrl);
    }
    return 0;
}

void bfin_gpio_pm_hibernate_suspend(void)
{
    int i, bank;

#ifdef BF538_FAMILY
    for (i = 0; i < ARRAY_SIZE(port_fer_saved); ++i)
        port_fer_saved[i] = *port_fer[i];
#endif

    for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
        bank = gpio_bank(i);

#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
        gpio_bank_saved[bank].fer = *port_fer[bank];
#if defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
        gpio_bank_saved[bank].mux = *port_mux[bank];
#else
        if (bank == 0)
            gpio_bank_saved[bank].mux = bfin_read_PORT_MUX();
#endif
#endif
        gpio_bank_saved[bank].data  = gpio_array[bank]->data;
        gpio_bank_saved[bank].inen  = gpio_array[bank]->inen;
        gpio_bank_saved[bank].polar = gpio_array[bank]->polar;
        gpio_bank_saved[bank].dir   = gpio_array[bank]->dir;
        gpio_bank_saved[bank].edge  = gpio_array[bank]->edge;
        gpio_bank_saved[bank].both  = gpio_array[bank]->both;
        gpio_bank_saved[bank].maska = gpio_array[bank]->maska;
    }

#ifdef BFIN_SPECIAL_GPIO_BANKS
    bfin_special_gpio_pm_hibernate_suspend();
#endif

    AWA_DUMMY_READ(maska);
}

void bfin_gpio_pm_hibernate_restore(void)
{
    int i, bank;

#ifdef BF538_FAMILY
    for (i = 0; i < ARRAY_SIZE(port_fer_saved); ++i)
        *port_fer[i] = port_fer_saved[i];
#endif

    for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
        bank = gpio_bank(i);

#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
#if defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
        *port_mux[bank] = gpio_bank_saved[bank].mux;
#else
        if (bank == 0)
            bfin_write_PORT_MUX(gpio_bank_saved[bank].mux);
#endif
        *port_fer[bank] = gpio_bank_saved[bank].fer;
#endif
        gpio_array[bank]->inen  = gpio_bank_saved[bank].inen;
        gpio_array[bank]->data_set = gpio_bank_saved[bank].data
                        & gpio_bank_saved[bank].dir;
        gpio_array[bank]->dir   = gpio_bank_saved[bank].dir;
        gpio_array[bank]->polar = gpio_bank_saved[bank].polar;
        gpio_array[bank]->edge  = gpio_bank_saved[bank].edge;
        gpio_array[bank]->both  = gpio_bank_saved[bank].both;
        gpio_array[bank]->maska = gpio_bank_saved[bank].maska;
    }

#ifdef BFIN_SPECIAL_GPIO_BANKS
    bfin_special_gpio_pm_hibernate_restore();
#endif

    AWA_DUMMY_READ(maska);
}


#endif
#else /* CONFIG_BF54x || CONFIG_BF60x */
#ifdef CONFIG_PM

int bfin_pm_standby_ctrl(unsigned ctrl)
{
    return 0;
}

void bfin_gpio_pm_hibernate_suspend(void)
{
    int i, bank;

    for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
        bank = gpio_bank(i);

        gpio_bank_saved[bank].fer = gpio_array[bank]->port_fer;
        gpio_bank_saved[bank].mux = gpio_array[bank]->port_mux;
        gpio_bank_saved[bank].data = gpio_array[bank]->data;
        gpio_bank_saved[bank].inen = gpio_array[bank]->inen;
        gpio_bank_saved[bank].dir = gpio_array[bank]->dir_set;
    }
}

void bfin_gpio_pm_hibernate_restore(void)
{
    int i, bank;

    for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
        bank = gpio_bank(i);

        gpio_array[bank]->port_mux = gpio_bank_saved[bank].mux;
        gpio_array[bank]->port_fer = gpio_bank_saved[bank].fer;
        gpio_array[bank]->inen = gpio_bank_saved[bank].inen;
        gpio_array[bank]->data_set = gpio_bank_saved[bank].data
                        & gpio_bank_saved[bank].dir;
        gpio_array[bank]->dir_set = gpio_bank_saved[bank].dir;
    }
}
#endif

unsigned short get_gpio_dir(unsigned gpio)
{
    return (0x01 & (gpio_array[gpio_bank(gpio)]->dir_clear >> gpio_sub_n(gpio)));
}
EXPORT_SYMBOL(get_gpio_dir);

#endif /* CONFIG_BF54x || CONFIG_BF60x */

/***********************************************************
*
* FUNCTIONS:    Blackfin Peripheral Resource Allocation
*       and PortMux Setup
*
* INPUTS/OUTPUTS:
* per   Peripheral Identifier
* label String
*
* DESCRIPTION: Blackfin Peripheral Resource Allocation and Setup API
*
* CAUTION:
*************************************************************
* MODIFICATION HISTORY :
**************************************************************/

int peripheral_request(unsigned short per, const char *label)
{
    unsigned long flags;
    unsigned short ident = P_IDENT(per);

    /*
     * Don't cares are pins with only one dedicated function
     */

    if (per & P_DONTCARE)
        return 0;

    if (!(per & P_DEFINED))
        return -ENODEV;

    BUG_ON(ident >= MAX_RESOURCES);

    flags = hard_local_irq_save();

    /* If a pin can be muxed as either GPIO or peripheral, make
     * sure it is not already a GPIO pin when we request it.
     */
    if (unlikely(!check_gpio(ident) && is_reserved(gpio, ident, 1))) {
        if (system_state == SYSTEM_BOOTING)
            dump_stack();
        printk(KERN_ERR
               "%s: Peripheral %d is already reserved as GPIO by %s !\n",
               __func__, ident, get_label(ident));
        hard_local_irq_restore(flags);
        return -EBUSY;
    }

    if (unlikely(is_reserved(peri, ident, 1))) {

        /*
         * Pin functions like AMC address strobes my
         * be requested and used by several drivers
         */

#if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
        if (!((per & P_MAYSHARE) && get_portmux(per) == P_FUNCT2MUX(per))) {
#else
        if (!(per & P_MAYSHARE)) {
#endif
            /*
             * Allow that the identical pin function can
             * be requested from the same driver twice
             */

            if (cmp_label(ident, label) == 0)
                goto anyway;

            if (system_state == SYSTEM_BOOTING)
                dump_stack();
            printk(KERN_ERR
                   "%s: Peripheral %d function %d is already reserved by %s !\n",
                   __func__, ident, P_FUNCT2MUX(per), get_label(ident));
            hard_local_irq_restore(flags);
            return -EBUSY;
        }
    }

    if (unlikely(portmux_group_check(per))) {
        hard_local_irq_restore(flags);
        return -EBUSY;
    }
 anyway:
    reserve(peri, ident);

    portmux_setup(per);
    port_setup(ident, PERIPHERAL_USAGE);

    hard_local_irq_restore(flags);
    set_label(ident, label);

    return 0;
}
EXPORT_SYMBOL(peripheral_request);

int peripheral_request_list(const unsigned short per[], const char *label)
{
    u16 cnt;
    int ret;

    for (cnt = 0; per[cnt] != 0; cnt++) {

        ret = peripheral_request(per[cnt], label);

        if (ret < 0) {
            for ( ; cnt > 0; cnt--)
                peripheral_free(per[cnt - 1]);

            return ret;
        }
    }

    return 0;
}
EXPORT_SYMBOL(peripheral_request_list);

void peripheral_free(unsigned short per)
{
    unsigned long flags;
    unsigned short ident = P_IDENT(per);

    if (per & P_DONTCARE)
        return;

    if (!(per & P_DEFINED))
        return;

    flags = hard_local_irq_save();

    if (unlikely(!is_reserved(peri, ident, 0))) {
        hard_local_irq_restore(flags);
        return;
    }

    if (!(per & P_MAYSHARE))
        port_setup(ident, GPIO_USAGE);

    unreserve(peri, ident);

    set_label(ident, "free");

    hard_local_irq_restore(flags);
}
EXPORT_SYMBOL(peripheral_free);

void peripheral_free_list(const unsigned short per[])
{
    u16 cnt;
    for (cnt = 0; per[cnt] != 0; cnt++)
        peripheral_free(per[cnt]);
}
EXPORT_SYMBOL(peripheral_free_list);

/***********************************************************
*
* FUNCTIONS: Blackfin GPIO Driver
*
* INPUTS/OUTPUTS:
* gpio  PIO Number between 0 and MAX_BLACKFIN_GPIOS
* label String
*
* DESCRIPTION: Blackfin GPIO Driver API
*
* CAUTION:
*************************************************************
* MODIFICATION HISTORY :
**************************************************************/

int bfin_gpio_request(unsigned gpio, const char *label)
{
    unsigned long flags;

    if (check_gpio(gpio) < 0)
        return -EINVAL;

    flags = hard_local_irq_save();

    /*
     * Allow that the identical GPIO can
     * be requested from the same driver twice
     * Do nothing and return -
     */

    if (cmp_label(gpio, label) == 0) {
        hard_local_irq_restore(flags);
        return 0;
    }

    if (unlikely(is_reserved(gpio, gpio, 1))) {
        if (system_state == SYSTEM_BOOTING)
            dump_stack();
        printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
               gpio, get_label(gpio));
        hard_local_irq_restore(flags);
        return -EBUSY;
    }
    if (unlikely(is_reserved(peri, gpio, 1))) {
        if (system_state == SYSTEM_BOOTING)
            dump_stack();
        printk(KERN_ERR
               "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
               gpio, get_label(gpio));
        hard_local_irq_restore(flags);
        return -EBUSY;
    }
    if (unlikely(is_reserved(gpio_irq, gpio, 1))) {
        printk(KERN_NOTICE "bfin-gpio: GPIO %d is already reserved as gpio-irq!"
               " (Documentation/blackfin/bfin-gpio-notes.txt)\n", gpio);
    }
#if !(defined(CONFIG_BF54x) || defined(CONFIG_BF60x))
    else {  /* Reset POLAR setting when acquiring a gpio for the first time */
        set_gpio_polar(gpio, 0);
    }
#endif

    reserve(gpio, gpio);
    set_label(gpio, label);

    hard_local_irq_restore(flags);

    port_setup(gpio, GPIO_USAGE);

    return 0;
}
EXPORT_SYMBOL(bfin_gpio_request);

void bfin_gpio_free(unsigned gpio)
{
    unsigned long flags;

    if (check_gpio(gpio) < 0)
        return;

    might_sleep();

    flags = hard_local_irq_save();

    if (unlikely(!is_reserved(gpio, gpio, 0))) {
        if (system_state == SYSTEM_BOOTING)
            dump_stack();
        gpio_error(gpio);
        hard_local_irq_restore(flags);
        return;
    }

    unreserve(gpio, gpio);

    set_label(gpio, "free");

    hard_local_irq_restore(flags);
}
EXPORT_SYMBOL(bfin_gpio_free);

#ifdef BFIN_SPECIAL_GPIO_BANKS
DECLARE_RESERVED_MAP(special_gpio, gpio_bank(MAX_RESOURCES));

int bfin_special_gpio_request(unsigned gpio, const char *label)
{
    unsigned long flags;

    flags = hard_local_irq_save();

    /*
     * Allow that the identical GPIO can
     * be requested from the same driver twice
     * Do nothing and return -
     */

    if (cmp_label(gpio, label) == 0) {
        hard_local_irq_restore(flags);
        return 0;
    }

    if (unlikely(is_reserved(special_gpio, gpio, 1))) {
        hard_local_irq_restore(flags);
        printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
               gpio, get_label(gpio));

        return -EBUSY;
    }
    if (unlikely(is_reserved(peri, gpio, 1))) {
        hard_local_irq_restore(flags);
        printk(KERN_ERR
               "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
               gpio, get_label(gpio));

        return -EBUSY;
    }

    reserve(special_gpio, gpio);
    reserve(peri, gpio);

    set_label(gpio, label);
    hard_local_irq_restore(flags);
    port_setup(gpio, GPIO_USAGE);

    return 0;
}
EXPORT_SYMBOL(bfin_special_gpio_request);

void bfin_special_gpio_free(unsigned gpio)
{
    unsigned long flags;

    might_sleep();

    flags = hard_local_irq_save();

    if (unlikely(!is_reserved(special_gpio, gpio, 0))) {
        gpio_error(gpio);
        hard_local_irq_restore(flags);
        return;
    }

    unreserve(special_gpio, gpio);
    unreserve(peri, gpio);
    set_label(gpio, "free");
    hard_local_irq_restore(flags);
}
EXPORT_SYMBOL(bfin_special_gpio_free);
#endif


int bfin_gpio_irq_request(unsigned gpio, const char *label)
{
    unsigned long flags;

    if (check_gpio(gpio) < 0)
        return -EINVAL;

    flags = hard_local_irq_save();

    if (unlikely(is_reserved(peri, gpio, 1))) {
        if (system_state == SYSTEM_BOOTING)
            dump_stack();
        printk(KERN_ERR
               "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
               gpio, get_label(gpio));
        hard_local_irq_restore(flags);
        return -EBUSY;
    }
    if (unlikely(is_reserved(gpio, gpio, 1)))
        printk(KERN_NOTICE "bfin-gpio: GPIO %d is already reserved by %s! "
               "(Documentation/blackfin/bfin-gpio-notes.txt)\n",
               gpio, get_label(gpio));

    reserve(gpio_irq, gpio);
    set_label(gpio, label);

    hard_local_irq_restore(flags);

    port_setup(gpio, GPIO_USAGE);

    return 0;
}

void bfin_gpio_irq_free(unsigned gpio)
{
    unsigned long flags;

    if (check_gpio(gpio) < 0)
        return;

    flags = hard_local_irq_save();

    if (unlikely(!is_reserved(gpio_irq, gpio, 0))) {
        if (system_state == SYSTEM_BOOTING)
            dump_stack();
        gpio_error(gpio);
        hard_local_irq_restore(flags);
        return;
    }

    unreserve(gpio_irq, gpio);

    set_label(gpio, "free");

    hard_local_irq_restore(flags);
}

static inline void __bfin_gpio_direction_input(unsigned gpio)
{
#if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
    gpio_array[gpio_bank(gpio)]->dir_clear = gpio_bit(gpio);
#else
    gpio_array[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
#endif
    gpio_array[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
}

int bfin_gpio_direction_input(unsigned gpio)
{
    unsigned long flags;

    if (unlikely(!is_reserved(gpio, gpio, 0))) {
        gpio_error(gpio);
        return -EINVAL;
    }

    flags = hard_local_irq_save();
    __bfin_gpio_direction_input(gpio);
    AWA_DUMMY_READ(inen);
    hard_local_irq_restore(flags);

    return 0;
}
EXPORT_SYMBOL(bfin_gpio_direction_input);

void bfin_gpio_irq_prepare(unsigned gpio)
{
#if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
    unsigned long flags;
#endif

    port_setup(gpio, GPIO_USAGE);

#if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
    flags = hard_local_irq_save();
    __bfin_gpio_direction_input(gpio);
    hard_local_irq_restore(flags);
#endif
}

void bfin_gpio_set_value(unsigned gpio, int arg)
{
    if (arg)
        gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
    else
        gpio_array[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
}
EXPORT_SYMBOL(bfin_gpio_set_value);

int bfin_gpio_direction_output(unsigned gpio, int value)
{
    unsigned long flags;

    if (unlikely(!is_reserved(gpio, gpio, 0))) {
        gpio_error(gpio);
        return -EINVAL;
    }

    flags = hard_local_irq_save();

    gpio_array[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
    gpio_set_value(gpio, value);
#if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
    gpio_array[gpio_bank(gpio)]->dir_set = gpio_bit(gpio);
#else
    gpio_array[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
#endif

    AWA_DUMMY_READ(dir);
    hard_local_irq_restore(flags);

    return 0;
}
EXPORT_SYMBOL(bfin_gpio_direction_output);

int bfin_gpio_get_value(unsigned gpio)
{
#if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
    return (1 & (gpio_array[gpio_bank(gpio)]->data >> gpio_sub_n(gpio)));
#else
    unsigned long flags;

    if (unlikely(get_gpio_edge(gpio))) {
        int ret;
        flags = hard_local_irq_save();
        set_gpio_edge(gpio, 0);
        ret = get_gpio_data(gpio);
        set_gpio_edge(gpio, 1);
        hard_local_irq_restore(flags);
        return ret;
    } else
        return get_gpio_data(gpio);
#endif
}
EXPORT_SYMBOL(bfin_gpio_get_value);

/* If we are booting from SPI and our board lacks a strong enough pull up,
 * the core can reset and execute the bootrom faster than the resistor can
 * pull the signal logically high.  To work around this (common) error in
 * board design, we explicitly set the pin back to GPIO mode, force /CS
 * high, and wait for the electrons to do their thing.
 *
 * This function only makes sense to be called from reset code, but it
 * lives here as we need to force all the GPIO states w/out going through
 * BUG() checks and such.
 */
void bfin_reset_boot_spi_cs(unsigned short pin)
{
    unsigned short gpio = P_IDENT(pin);
    port_setup(gpio, GPIO_USAGE);
    gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
    AWA_DUMMY_READ(data_set);
    udelay(1);
}

#if defined(CONFIG_PROC_FS)
static int gpio_proc_show(struct seq_file *m, void *v)
{
    int c, irq, gpio;

    for (c = 0; c < MAX_RESOURCES; c++) {
        irq = is_reserved(gpio_irq, c, 1);
        gpio = is_reserved(gpio, c, 1);
        if (!check_gpio(c) && (gpio || irq))
            seq_printf(m, "GPIO_%d: \t%s%s \t\tGPIO %s\n", c,
                 get_label(c), (gpio && irq) ? " *" : "",
                 get_gpio_dir(c) ? "OUTPUT" : "INPUT");
        else if (is_reserved(peri, c, 1))
            seq_printf(m, "GPIO_%d: \t%s \t\tPeripheral\n", c, get_label(c));
        else
            continue;
    }

    return 0;
}

static int gpio_proc_open(struct inode *inode, struct file *file)
{
    return single_open(file, gpio_proc_show, NULL);
}

static const struct file_operations gpio_proc_ops = {
    .open       = gpio_proc_open,
    .read       = seq_read,
    .llseek     = seq_lseek,
    .release    = single_release,
};

static __init int gpio_register_proc(void)
{
    struct proc_dir_entry *proc_gpio;

    proc_gpio = proc_create("gpio", 0, NULL, &gpio_proc_ops);
    return proc_gpio == NULL;
}
__initcall(gpio_register_proc);
#endif

#ifdef CONFIG_GPIOLIB
static int bfin_gpiolib_direction_input(struct gpio_chip *chip, unsigned gpio)
{
    return bfin_gpio_direction_input(gpio);
}

static int bfin_gpiolib_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
{
    return bfin_gpio_direction_output(gpio, level);
}

static int bfin_gpiolib_get_value(struct gpio_chip *chip, unsigned gpio)
{
    return bfin_gpio_get_value(gpio);
}

static void bfin_gpiolib_set_value(struct gpio_chip *chip, unsigned gpio, int value)
{
    return bfin_gpio_set_value(gpio, value);
}

static int bfin_gpiolib_gpio_request(struct gpio_chip *chip, unsigned gpio)
{
    return bfin_gpio_request(gpio, chip->label);
}

static void bfin_gpiolib_gpio_free(struct gpio_chip *chip, unsigned gpio)
{
    return bfin_gpio_free(gpio);
}

static int bfin_gpiolib_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
{
    return gpio + GPIO_IRQ_BASE;
}

static struct gpio_chip bfin_chip = {
    .label          = "BFIN-GPIO",
    .direction_input    = bfin_gpiolib_direction_input,
    .get            = bfin_gpiolib_get_value,
    .direction_output   = bfin_gpiolib_direction_output,
    .set            = bfin_gpiolib_set_value,
    .request        = bfin_gpiolib_gpio_request,
    .free           = bfin_gpiolib_gpio_free,
    .to_irq         = bfin_gpiolib_gpio_to_irq,
    .base           = 0,
    .ngpio          = MAX_BLACKFIN_GPIOS,
};

static int __init bfin_gpiolib_setup(void)
{
    return gpiochip_add(&bfin_chip);
}
arch_initcall(bfin_gpiolib_setup);
#endif