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bfin_gpio.c

/*
 * 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 <asm/blackfin.h>
#include <asm/gpio.h>
#include <asm/portmux.h>
#include <linux/irq.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)
      (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,
      (struct gpio_port_t *)PORTH_FER,
      (struct gpio_port_t *)PORTI_FER,
      (struct gpio_port_t *)PORTJ_FER,
#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

00113 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];
#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)
      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)
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

#ifndef CONFIG_BF54x
/***********************************************************
*
* 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_PROG_INTB, IRQ_PORTG_INTB, IRQ_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;

      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;
      }

      AWA_DUMMY_READ(maska);
}

void bfin_gpio_pm_hibernate_restore(void)
{
      int i, bank;

      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;
      }
      AWA_DUMMY_READ(maska);
}


#endif
#else /* CONFIG_BF54x */
#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]->dir_set = gpio_bank_saved[bank].dir;
            gpio_array[bank]->data_set = gpio_bank_saved[bank].data
                                    | 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 */

/***********************************************************
*
* 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
             */

#ifdef CONFIG_BF54x
            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);
      }
#ifndef CONFIG_BF54x
      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)
{
#ifdef CONFIG_BF54x
      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)
{
#ifdef CONFIG_BF54x
      unsigned long flags;
#endif

      port_setup(gpio, GPIO_USAGE);

#ifdef CONFIG_BF54x
      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);
#ifdef CONFIG_BF54x
      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)
{
#ifdef CONFIG_BF54x
      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_read(char *buf, char **start, off_t offset,
                    int len, int *unused_i, void *unused_v)
{
      int c, irq, gpio, outlen = 0;

      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))
                  len = sprintf(buf, "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))
                  len = sprintf(buf, "GPIO_%d: \t%s \t\tPeripheral\n", c, get_label(c));
            else
                  continue;
            buf += len;
            outlen += len;
      }
      return outlen;
}

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

      proc_gpio = create_proc_entry("gpio", S_IRUGO, NULL);
      if (proc_gpio)
            proc_gpio->read_proc = gpio_proc_read;
      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

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