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bfin_gpio.c

/*
 * File:         arch/blackfin/kernel/bfin_gpio.c
 * Based on:
 * Author:       Michael Hennerich (hennerich@blackfin.uclinux.org)
 *
 * Created:
 * Description:  GPIO Abstraction Layer
 *
 * Modified:
 *               Copyright 2008 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

/*
*  Number     BF537/6/4    BF561    BF533/2/1      BF549/8/4/2
*
*  GPIO_0       PF0         PF0        PF0         PA0...PJ13
*  GPIO_1       PF1         PF1        PF1
*  GPIO_2       PF2         PF2        PF2
*  GPIO_3       PF3         PF3        PF3
*  GPIO_4       PF4         PF4        PF4
*  GPIO_5       PF5         PF5        PF5
*  GPIO_6       PF6         PF6        PF6
*  GPIO_7       PF7         PF7        PF7
*  GPIO_8       PF8         PF8        PF8
*  GPIO_9       PF9         PF9        PF9
*  GPIO_10      PF10        PF10       PF10
*  GPIO_11      PF11        PF11       PF11
*  GPIO_12      PF12        PF12       PF12
*  GPIO_13      PF13        PF13       PF13
*  GPIO_14      PF14        PF14       PF14
*  GPIO_15      PF15        PF15       PF15
*  GPIO_16      PG0         PF16
*  GPIO_17      PG1         PF17
*  GPIO_18      PG2         PF18
*  GPIO_19      PG3         PF19
*  GPIO_20      PG4         PF20
*  GPIO_21      PG5         PF21
*  GPIO_22      PG6         PF22
*  GPIO_23      PG7         PF23
*  GPIO_24      PG8         PF24
*  GPIO_25      PG9         PF25
*  GPIO_26      PG10        PF26
*  GPIO_27      PG11        PF27
*  GPIO_28      PG12        PF28
*  GPIO_29      PG13        PF29
*  GPIO_30      PG14        PF30
*  GPIO_31      PG15        PF31
*  GPIO_32      PH0         PF32
*  GPIO_33      PH1         PF33
*  GPIO_34      PH2         PF34
*  GPIO_35      PH3         PF35
*  GPIO_36      PH4         PF36
*  GPIO_37      PH5         PF37
*  GPIO_38      PH6         PF38
*  GPIO_39      PH7         PF39
*  GPIO_40      PH8         PF40
*  GPIO_41      PH9         PF41
*  GPIO_42      PH10        PF42
*  GPIO_43      PH11        PF43
*  GPIO_44      PH12        PF44
*  GPIO_45      PH13        PF45
*  GPIO_46      PH14        PF46
*  GPIO_47      PH15        PF47
*/

#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

#ifdef BF533_FAMILY
static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
      (struct gpio_port_t *) FIO_FLAG_D,
};
#endif

#if defined(BF527_FAMILY) || defined(BF537_FAMILY)
static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
      (struct gpio_port_t *) PORTFIO,
      (struct gpio_port_t *) PORTGIO,
      (struct gpio_port_t *) PORTHIO,
};

static unsigned short *port_fer[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
      (unsigned short *) PORTF_FER,
      (unsigned short *) PORTG_FER,
      (unsigned short *) PORTH_FER,
};
#endif

#ifdef BF527_FAMILY
static unsigned short *port_mux[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
      (unsigned short *) PORTF_MUX,
      (unsigned short *) PORTG_MUX,
      (unsigned short *) PORTH_MUX,
};

static const
u8 pmux_offset[][16] =
      {{ 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 */
      };
#endif

#ifdef BF561_FAMILY
static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
      (struct gpio_port_t *) FIO0_FLAG_D,
      (struct gpio_port_t *) FIO1_FLAG_D,
      (struct gpio_port_t *) FIO2_FLAG_D,
};
#endif

#ifdef BF548_FAMILY
static struct gpio_port_t *gpio_array[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
      (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,
};
#endif

static unsigned short reserved_gpio_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
static unsigned short reserved_peri_map[gpio_bank(MAX_RESOURCES)];

#define RESOURCE_LABEL_SIZE   16

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

#if defined(CONFIG_PM)
#if defined(CONFIG_BF54x)
static struct gpio_port_s gpio_bank_saved[gpio_bank(MAX_BLACKFIN_GPIOS)];
#else
static unsigned short wakeup_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
static unsigned char wakeup_flags_map[MAX_BLACKFIN_GPIOS];
static struct gpio_port_s gpio_bank_saved[gpio_bank(MAX_BLACKFIN_GPIOS)];

#ifdef BF533_FAMILY
static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB};
#endif

#ifdef BF537_FAMILY
static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB, IRQ_PORTG_INTB, IRQ_MAC_TX};
#endif

#ifdef BF527_FAMILY
static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PORTF_INTB, IRQ_PORTG_INTB, IRQ_PORTH_INTB};
#endif

#ifdef BF561_FAMILY
static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB};
#endif
#endif
#endif /* CONFIG_PM */

#if defined(BF548_FAMILY)
inline int check_gpio(unsigned gpio)
{
      if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15
          || gpio == GPIO_PH14 || gpio == GPIO_PH15
          || gpio == GPIO_PJ14 || gpio == GPIO_PJ15
          || gpio >= MAX_BLACKFIN_GPIOS)
            return -EINVAL;
      return 0;
}
#else
inline int check_gpio(unsigned gpio)
{
      if (gpio >= MAX_BLACKFIN_GPIOS)
            return -EINVAL;
      return 0;
}
#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 strncmp(str_ident[ident].name,
                         label, strlen(label));
      else
            return -EINVAL;
}

#if defined(BF527_FAMILY) || defined(BF537_FAMILY)
static void port_setup(unsigned gpio, unsigned short usage)
{
      if (!check_gpio(gpio)) {
            if (usage == GPIO_USAGE)
                  *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
            else
                  *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
            SSYNC();
      }
}
#elif defined(BF548_FAMILY)
static void port_setup(unsigned gpio, unsigned short usage)
{
      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();
}
#else
# define port_setup(...)  do { } while (0)
#endif

#ifdef BF537_FAMILY
static struct {
      unsigned short res;
      unsigned short offset;
} port_mux_lut[] = {
      {.res = P_PPI0_D13, .offset = 11},
      {.res = P_PPI0_D14, .offset = 11},
      {.res = P_PPI0_D15, .offset = 11},
      {.res = P_SPORT1_TFS, .offset = 11},
      {.res = P_SPORT1_TSCLK, .offset = 11},
      {.res = P_SPORT1_DTPRI, .offset = 11},
      {.res = P_PPI0_D10, .offset = 10},
      {.res = P_PPI0_D11, .offset = 10},
      {.res = P_PPI0_D12, .offset = 10},
      {.res = P_SPORT1_RSCLK, .offset = 10},
      {.res = P_SPORT1_RFS, .offset = 10},
      {.res = P_SPORT1_DRPRI, .offset = 10},
      {.res = P_PPI0_D8, .offset = 9},
      {.res = P_PPI0_D9, .offset = 9},
      {.res = P_SPORT1_DRSEC, .offset = 9},
      {.res = P_SPORT1_DTSEC, .offset = 9},
      {.res = P_TMR2, .offset = 8},
      {.res = P_PPI0_FS3, .offset = 8},
      {.res = P_TMR3, .offset = 7},
      {.res = P_SPI0_SSEL4, .offset = 7},
      {.res = P_TMR4, .offset = 6},
      {.res = P_SPI0_SSEL5, .offset = 6},
      {.res = P_TMR5, .offset = 5},
      {.res = P_SPI0_SSEL6, .offset = 5},
      {.res = P_UART1_RX, .offset = 4},
      {.res = P_UART1_TX, .offset = 4},
      {.res = P_TMR6, .offset = 4},
      {.res = P_TMR7, .offset = 4},
      {.res = P_UART0_RX, .offset = 3},
      {.res = P_UART0_TX, .offset = 3},
      {.res = P_DMAR0, .offset = 3},
      {.res = P_DMAR1, .offset = 3},
      {.res = P_SPORT0_DTSEC, .offset = 1},
      {.res = P_SPORT0_DRSEC, .offset = 1},
      {.res = P_CAN0_RX, .offset = 1},
      {.res = P_CAN0_TX, .offset = 1},
      {.res = P_SPI0_SSEL7, .offset = 1},
      {.res = P_SPORT0_TFS, .offset = 0},
      {.res = P_SPORT0_DTPRI, .offset = 0},
      {.res = P_SPI0_SSEL2, .offset = 0},
      {.res = P_SPI0_SSEL3, .offset = 0},
};

static void portmux_setup(unsigned short per, unsigned short function)
{
      u16 y, offset, muxreg;

      for (y = 0; y < ARRAY_SIZE(port_mux_lut); y++) {
            if (port_mux_lut[y].res == per) {

                  /* SET PORTMUX REG */

                  offset = port_mux_lut[y].offset;
                  muxreg = bfin_read_PORT_MUX();

                  if (offset != 1)
                        muxreg &= ~(1 << offset);
                  else
                        muxreg &= ~(3 << 1);

                  muxreg |= (function << offset);
                  bfin_write_PORT_MUX(muxreg);
            }
      }
}
#elif defined(BF548_FAMILY)
inline void portmux_setup(unsigned short portno, unsigned short function)
{
      u32 pmux;

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

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

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

inline u16 get_portmux(unsigned short portno)
{
      u32 pmux;

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

      return (pmux >> (2 * gpio_sub_n(portno)) & 0x3);
}
#elif defined(BF527_FAMILY)
inline void portmux_setup(unsigned short portno, unsigned short function)
{
      u16 pmux, ident = P_IDENT(portno);
      u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)];

      pmux = *port_mux[gpio_bank(ident)];
      pmux &= ~(3 << offset);
      pmux |= (function & 3) << offset;
      *port_mux[gpio_bank(ident)] = pmux;
      SSYNC();
}
#else
# define portmux_setup(...)  do { } while (0)
#endif

static int __init bfin_gpio_init(void)
{
      printk(KERN_INFO "Blackfin GPIO Controller\n");

      return 0;
}
arch_initcall(bfin_gpio_init);


#ifndef BF548_FAMILY
/***********************************************************
*
* 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; \
      local_irq_save(flags); \
      if (arg) \
            gpio_bankb[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
      else \
            gpio_bankb[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
      AWA_DUMMY_READ(name); \
      local_irq_restore(flags); \
} \
EXPORT_SYMBOL(set_gpio_ ## name);

SET_GPIO(dir)
SET_GPIO(inen)
SET_GPIO(polar)
SET_GPIO(edge)
SET_GPIO(both)


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

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

#if ANOMALY_05000311 || ANOMALY_05000323
void set_gpio_toggle(unsigned gpio)
{
      unsigned long flags;
      local_irq_save(flags);
      gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
      AWA_DUMMY_READ(toggle);
      local_irq_restore(flags);
}
#else
void set_gpio_toggle(unsigned gpio)
{
      gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
}
#endif
EXPORT_SYMBOL(set_gpio_toggle);


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

#if ANOMALY_05000311 || ANOMALY_05000323
#define SET_GPIO_P(name) \
void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
{ \
      unsigned long flags; \
      local_irq_save(flags); \
      gpio_bankb[gpio_bank(gpio)]->name = arg; \
      AWA_DUMMY_READ(name); \
      local_irq_restore(flags); \
} \
EXPORT_SYMBOL(set_gpiop_ ## name);
#else
#define SET_GPIO_P(name) \
void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
{ \
      gpio_bankb[gpio_bank(gpio)]->name = arg; \
} \
EXPORT_SYMBOL(set_gpiop_ ## name);
#endif

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 */
#if ANOMALY_05000311 || ANOMALY_05000323
#define GET_GPIO(name) \
unsigned short get_gpio_ ## name(unsigned gpio) \
{ \
      unsigned long flags; \
      unsigned short ret; \
      local_irq_save(flags); \
      ret = 0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio)); \
      AWA_DUMMY_READ(name); \
      local_irq_restore(flags); \
      return ret; \
} \
EXPORT_SYMBOL(get_gpio_ ## name);
#else
#define GET_GPIO(name) \
unsigned short get_gpio_ ## name(unsigned gpio) \
{ \
      return (0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio))); \
} \
EXPORT_SYMBOL(get_gpio_ ## name);
#endif

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)*/

#if ANOMALY_05000311 || ANOMALY_05000323
#define GET_GPIO_P(name) \
unsigned short get_gpiop_ ## name(unsigned gpio) \
{ \
      unsigned long flags; \
      unsigned short ret; \
      local_irq_save(flags); \
      ret = (gpio_bankb[gpio_bank(gpio)]->name); \
      AWA_DUMMY_READ(name); \
      local_irq_restore(flags); \
      return ret; \
} \
EXPORT_SYMBOL(get_gpiop_ ## name);
#else
#define GET_GPIO_P(name) \
unsigned short get_gpiop_ ## name(unsigned gpio) \
{ \
      return (gpio_bankb[gpio_bank(gpio)]->name);\
} \
EXPORT_SYMBOL(get_gpiop_ ## name);
#endif

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
/***********************************************************
*
* 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_request(unsigned gpio, unsigned char type)
{
      unsigned long flags;

      if ((check_gpio(gpio) < 0) || !type)
            return -EINVAL;

      local_irq_save(flags);
      wakeup_map[gpio_bank(gpio)] |= gpio_bit(gpio);
      wakeup_flags_map[gpio] = type;
      local_irq_restore(flags);

      return 0;
}
EXPORT_SYMBOL(gpio_pm_wakeup_request);

void gpio_pm_wakeup_free(unsigned gpio)
{
      unsigned long flags;

      if (check_gpio(gpio) < 0)
            return;

      local_irq_save(flags);

      wakeup_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);

      local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_pm_wakeup_free);

static int bfin_gpio_wakeup_type(unsigned gpio, unsigned char type)
{
      port_setup(gpio, GPIO_USAGE);
      set_gpio_dir(gpio, 0);
      set_gpio_inen(gpio, 1);

      if (type & (PM_WAKE_RISING | PM_WAKE_FALLING))
            set_gpio_edge(gpio, 1);
       else
            set_gpio_edge(gpio, 0);

      if ((type & (PM_WAKE_BOTH_EDGES)) == (PM_WAKE_BOTH_EDGES))
            set_gpio_both(gpio, 1);
      else
            set_gpio_both(gpio, 0);

      if ((type & (PM_WAKE_FALLING | PM_WAKE_LOW)))
            set_gpio_polar(gpio, 1);
      else
            set_gpio_polar(gpio, 0);

      SSYNC();

      return 0;
}

u32 bfin_pm_standby_setup(void)
{
      u16 bank, mask, i, gpio;

      for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
            mask = wakeup_map[gpio_bank(i)];
            bank = gpio_bank(i);

            gpio_bank_saved[bank].maskb = gpio_bankb[bank]->maskb;
            gpio_bankb[bank]->maskb = 0;

            if (mask) {
#if defined(BF527_FAMILY) || defined(BF537_FAMILY)
                  gpio_bank_saved[bank].fer   = *port_fer[bank];
#endif
                  gpio_bank_saved[bank].inen  = gpio_bankb[bank]->inen;
                  gpio_bank_saved[bank].polar = gpio_bankb[bank]->polar;
                  gpio_bank_saved[bank].dir   = gpio_bankb[bank]->dir;
                  gpio_bank_saved[bank].edge  = gpio_bankb[bank]->edge;
                  gpio_bank_saved[bank].both  = gpio_bankb[bank]->both;
                  gpio_bank_saved[bank].reserved =
                                    reserved_gpio_map[bank];

                  gpio = i;

                  while (mask) {
                        if ((mask & 1) && (wakeup_flags_map[gpio] !=
                              PM_WAKE_IGNORE)) {
                              reserved_gpio_map[gpio_bank(gpio)] |=
                                          gpio_bit(gpio);
                              bfin_gpio_wakeup_type(gpio,
                                    wakeup_flags_map[gpio]);
                              set_gpio_data(gpio, 0); /*Clear*/
                        }
                        gpio++;
                        mask >>= 1;
                  }

                  bfin_internal_set_wake(sic_iwr_irqs[bank], 1);
                  gpio_bankb[bank]->maskb_set = wakeup_map[gpio_bank(i)];
            }
      }

      AWA_DUMMY_READ(maskb_set);

      return 0;
}

void bfin_pm_standby_restore(void)
{
      u16 bank, mask, i;

      for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
            mask = wakeup_map[gpio_bank(i)];
            bank = gpio_bank(i);

            if (mask) {
#if defined(BF527_FAMILY) || defined(BF537_FAMILY)
                  *port_fer[bank]         = gpio_bank_saved[bank].fer;
#endif
                  gpio_bankb[bank]->inen  = gpio_bank_saved[bank].inen;
                  gpio_bankb[bank]->dir   = gpio_bank_saved[bank].dir;
                  gpio_bankb[bank]->polar = gpio_bank_saved[bank].polar;
                  gpio_bankb[bank]->edge  = gpio_bank_saved[bank].edge;
                  gpio_bankb[bank]->both  = gpio_bank_saved[bank].both;

                  reserved_gpio_map[bank] =
                              gpio_bank_saved[bank].reserved;
                  bfin_internal_set_wake(sic_iwr_irqs[bank], 0);
            }

            gpio_bankb[bank]->maskb = gpio_bank_saved[bank].maskb;
      }
      AWA_DUMMY_READ(maskb);
}

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(BF527_FAMILY) || defined(BF537_FAMILY)
                  gpio_bank_saved[bank].fer   = *port_fer[bank];
#ifdef BF527_FAMILY
                  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_bankb[bank]->data;
                  gpio_bank_saved[bank].inen  = gpio_bankb[bank]->inen;
                  gpio_bank_saved[bank].polar = gpio_bankb[bank]->polar;
                  gpio_bank_saved[bank].dir   = gpio_bankb[bank]->dir;
                  gpio_bank_saved[bank].edge  = gpio_bankb[bank]->edge;
                  gpio_bank_saved[bank].both  = gpio_bankb[bank]->both;
                  gpio_bank_saved[bank].maska  = gpio_bankb[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(BF527_FAMILY) || defined(BF537_FAMILY)
#ifdef BF527_FAMILY
                  *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_bankb[bank]->inen  = gpio_bank_saved[bank].inen;
                  gpio_bankb[bank]->dir   = gpio_bank_saved[bank].dir;
                  gpio_bankb[bank]->polar = gpio_bank_saved[bank].polar;
                  gpio_bankb[bank]->edge  = gpio_bank_saved[bank].edge;
                  gpio_bankb[bank]->both  = gpio_bank_saved[bank].both;

                  gpio_bankb[bank]->data_set = gpio_bank_saved[bank].data
                                          | gpio_bank_saved[bank].dir;

                  gpio_bankb[bank]->maska = gpio_bank_saved[bank].maska;
      }
      AWA_DUMMY_READ(maska);
}


#endif
#else /* BF548_FAMILY */
#ifdef CONFIG_PM

u32 bfin_pm_standby_setup(void)
{
      return 0;
}

void bfin_pm_standby_restore(void)
{

}

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]->port_data;
                  gpio_bank_saved[bank].data  = gpio_array[bank]->port_data;
                  gpio_bank_saved[bank].inen  = gpio_array[bank]->port_inen;
                  gpio_bank_saved[bank].dir   = gpio_array[bank]->port_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]->port_inen  = gpio_bank_saved[bank].inen;
                  gpio_array[bank]->port_dir_set   = gpio_bank_saved[bank].dir;
                  gpio_array[bank]->port_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)]->port_dir_clear >> gpio_sub_n(gpio)));
}
EXPORT_SYMBOL(get_gpio_dir);

#endif /* BF548_FAMILY */

/***********************************************************
*
* 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 :
**************************************************************/

#ifdef BF548_FAMILY
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;

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

      local_irq_save(flags);

      if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
            dump_stack();
            printk(KERN_ERR
                "%s: Peripheral %d is already reserved as GPIO by %s !\n",
                   __func__, ident, get_label(ident));
            local_irq_restore(flags);
            return -EBUSY;
      }

      if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {

            u16 funct = get_portmux(ident);

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

            if (!((per & P_MAYSHARE) && (funct == P_FUNCT2MUX(per)))) {

                  /*
                   * Allow that the identical pin function can
                   * be requested from the same driver twice
                   */

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

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

 anyway:
      reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);

      portmux_setup(ident, P_FUNCT2MUX(per));
      port_setup(ident, PERIPHERAL_USAGE);

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

      return 0;
}
EXPORT_SYMBOL(peripheral_request);
#else

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;

      local_irq_save(flags);

      if (!check_gpio(ident)) {

            if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
                  dump_stack();
                  printk(KERN_ERR
                         "%s: Peripheral %d is already reserved as GPIO by %s !\n",
                         __func__, ident, get_label(ident));
                  local_irq_restore(flags);
                  return -EBUSY;
            }

      }

      if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {

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

            if (!(per & P_MAYSHARE)) {

                  /*
                   * Allow that the identical pin function can
                   * be requested from the same driver twice
                   */

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

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

      }

 anyway:
      portmux_setup(per, P_FUNCT2MUX(per));

      port_setup(ident, PERIPHERAL_USAGE);

      reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
      local_irq_restore(flags);
      set_label(ident, label);

      return 0;
}
EXPORT_SYMBOL(peripheral_request);
#endif

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;

      if (check_gpio(ident) < 0)
            return;

      local_irq_save(flags);

      if (unlikely(!(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident)))) {
            local_irq_restore(flags);
            return;
      }

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

      reserved_peri_map[gpio_bank(ident)] &= ~gpio_bit(ident);

      set_label(ident, "free");

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

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

      local_irq_save(flags);

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

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

      if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
            dump_stack();
            printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
                   gpio, get_label(gpio));
            local_irq_restore(flags);
            return -EBUSY;
      }
      if (unlikely(reserved_peri_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
            dump_stack();
            printk(KERN_ERR
                   "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
                   gpio, get_label(gpio));
            local_irq_restore(flags);
            return -EBUSY;
      }

      reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);

      local_irq_restore(flags);

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

      return 0;
}
EXPORT_SYMBOL(gpio_request);

void gpio_free(unsigned gpio)
{
      unsigned long flags;

      if (check_gpio(gpio) < 0)
            return;

      local_irq_save(flags);

      if (unlikely(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
            dump_stack();
            gpio_error(gpio);
            local_irq_restore(flags);
            return;
      }

      reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);

      set_label(gpio, "free");

      local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_free);


#ifdef BF548_FAMILY
int gpio_direction_input(unsigned gpio)
{
      unsigned long flags;

      if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
            gpio_error(gpio);
            return -EINVAL;
      }

      local_irq_save(flags);
      gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
      gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
      local_irq_restore(flags);

      return 0;
}
EXPORT_SYMBOL(gpio_direction_input);

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

      if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
            gpio_error(gpio);
            return -EINVAL;
      }

      local_irq_save(flags);
      gpio_array[gpio_bank(gpio)]->port_inen &= ~gpio_bit(gpio);
      gpio_set_value(gpio, value);
      gpio_array[gpio_bank(gpio)]->port_dir_set = gpio_bit(gpio);
      local_irq_restore(flags);

      return 0;
}
EXPORT_SYMBOL(gpio_direction_output);

void gpio_set_value(unsigned gpio, int arg)
{
      if (arg)
            gpio_array[gpio_bank(gpio)]->port_set = gpio_bit(gpio);
      else
            gpio_array[gpio_bank(gpio)]->port_clear = gpio_bit(gpio);
}
EXPORT_SYMBOL(gpio_set_value);

int gpio_get_value(unsigned gpio)
{
      return (1 & (gpio_array[gpio_bank(gpio)]->port_data >> gpio_sub_n(gpio)));
}
EXPORT_SYMBOL(gpio_get_value);

void bfin_gpio_irq_prepare(unsigned gpio)
{
      unsigned long flags;

      port_setup(gpio, GPIO_USAGE);

      local_irq_save(flags);
      gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
      gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
      local_irq_restore(flags);
}

#else

int gpio_get_value(unsigned gpio)
{
      unsigned long flags;
      int ret;

      if (unlikely(get_gpio_edge(gpio))) {
            local_irq_save(flags);
            set_gpio_edge(gpio, 0);
            ret = get_gpio_data(gpio);
            set_gpio_edge(gpio, 1);
            local_irq_restore(flags);

            return ret;
      } else
            return get_gpio_data(gpio);
}
EXPORT_SYMBOL(gpio_get_value);


int gpio_direction_input(unsigned gpio)
{
      unsigned long flags;

      if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
            gpio_error(gpio);
            return -EINVAL;
      }

      local_irq_save(flags);
      gpio_bankb[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
      gpio_bankb[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
      AWA_DUMMY_READ(inen);
      local_irq_restore(flags);

      return 0;
}
EXPORT_SYMBOL(gpio_direction_input);

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

      if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
            gpio_error(gpio);
            return -EINVAL;
      }

      local_irq_save(flags);
      gpio_bankb[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);

      if (value)
            gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
      else
            gpio_bankb[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);

      gpio_bankb[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
      AWA_DUMMY_READ(dir);
      local_irq_restore(flags);

      return 0;
}
EXPORT_SYMBOL(gpio_direction_output);

/* 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_gpio_reset_spi0_ssel1(void)
{
      u16 gpio = P_IDENT(P_SPI0_SSEL1);

      port_setup(gpio, GPIO_USAGE);
      gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
      AWA_DUMMY_READ(data_set);
      udelay(1);
}

void bfin_gpio_irq_prepare(unsigned gpio)
{
      port_setup(gpio, GPIO_USAGE);
}

#endif /*BF548_FAMILY */

#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, outlen = 0;

      for (c = 0; c < MAX_RESOURCES; c++) {
            if (!check_gpio(c) && (reserved_gpio_map[gpio_bank(c)] & gpio_bit(c)))
                  len = sprintf(buf, "GPIO_%d: %s \t\tGPIO %s\n", c,
                         get_label(c), get_gpio_dir(c) ? "OUTPUT" : "INPUT");
            else if (reserved_peri_map[gpio_bank(c)] & gpio_bit(c))
                  len = sprintf(buf, "GPIO_%d: %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

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