/*
* File: arch/blackfin/kernel/bfin_gpio.c
* Based on:
* Author: Michael Hennerich (hennerich@blackfin.uclinux.org)
*
* Created:
* Description: GPIO Abstraction Layer
*
* Modified:
* Copyright 2006 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
*
* GPIO_0 PF0 PF0 PF0
* 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/module.h>
#include <linux/err.h>
#include <asm/blackfin.h>
#include <asm/gpio.h>
#include <asm/portmux.h>
#include <linux/irq.h>
#ifdef BF533_FAMILY
static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
(struct gpio_port_t *) FIO_FLAG_D,
};
#endif
#ifdef 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 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
static unsigned short reserved_gpio_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
static unsigned short reserved_peri_map[gpio_bank(MAX_BLACKFIN_GPIOS + 16)];
char *str_ident = NULL;
#define RESOURCE_LABEL_SIZE 16
#ifdef CONFIG_PM
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 BF561_FAMILY
static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB};
#endif
#endif /* CONFIG_PM */
inline int check_gpio(unsigned short gpio)
{
if (gpio >= MAX_BLACKFIN_GPIOS)
return -EINVAL;
return 0;
}
static void set_label(unsigned short ident, const char *label)
{
if (label && str_ident) {
strncpy(str_ident + ident * RESOURCE_LABEL_SIZE, label,
RESOURCE_LABEL_SIZE);
str_ident[ident * RESOURCE_LABEL_SIZE +
RESOURCE_LABEL_SIZE - 1] = 0;
}
}
static char *get_label(unsigned short ident)
{
if (!str_ident)
return "UNKNOWN";
return (str_ident[ident * RESOURCE_LABEL_SIZE] ?
(str_ident + ident * RESOURCE_LABEL_SIZE) : "UNKNOWN");
}
static int cmp_label(unsigned short ident, const char *label)
{
if (label && str_ident)
return strncmp(str_ident + ident * RESOURCE_LABEL_SIZE,
label, strlen(label));
else
return -EINVAL;
}
#ifdef BF537_FAMILY
static void port_setup(unsigned short 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();
}
}
#else
# define port_setup(...) do { } while (0)
#endif
#ifdef BF537_FAMILY
#define PMUX_LUT_RES 0
#define PMUX_LUT_OFFSET 1
#define PMUX_LUT_ENTRIES 41
#define PMUX_LUT_SIZE 2
static unsigned short port_mux_lut[PMUX_LUT_ENTRIES][PMUX_LUT_SIZE] = {
{P_PPI0_D13, 11}, {P_PPI0_D14, 11}, {P_PPI0_D15, 11},
{P_SPORT1_TFS, 11}, {P_SPORT1_TSCLK, 11}, {P_SPORT1_DTPRI, 11},
{P_PPI0_D10, 10}, {P_PPI0_D11, 10}, {P_PPI0_D12, 10},
{P_SPORT1_RSCLK, 10}, {P_SPORT1_RFS, 10}, {P_SPORT1_DRPRI, 10},
{P_PPI0_D8, 9}, {P_PPI0_D9, 9}, {P_SPORT1_DRSEC, 9},
{P_SPORT1_DTSEC, 9}, {P_TMR2, 8}, {P_PPI0_FS3, 8}, {P_TMR3, 7},
{P_SPI0_SSEL4, 7}, {P_TMR4, 6}, {P_SPI0_SSEL5, 6}, {P_TMR5, 5},
{P_SPI0_SSEL6, 5}, {P_UART1_RX, 4}, {P_UART1_TX, 4}, {P_TMR6, 4},
{P_TMR7, 4}, {P_UART0_RX, 3}, {P_UART0_TX, 3}, {P_DMAR0, 3},
{P_DMAR1, 3}, {P_SPORT0_DTSEC, 1}, {P_SPORT0_DRSEC, 1},
{P_CAN0_RX, 1}, {P_CAN0_TX, 1}, {P_SPI0_SSEL7, 1},
{P_SPORT0_TFS, 0}, {P_SPORT0_DTPRI, 0}, {P_SPI0_SSEL2, 0},
{P_SPI0_SSEL3, 0}
};
static void portmux_setup(unsigned short per, unsigned short function)
{
u16 y, muxreg, offset;
for (y = 0; y < PMUX_LUT_ENTRIES; y++) {
if (port_mux_lut[y][PMUX_LUT_RES] == per) {
/* SET PORTMUX REG */
offset = port_mux_lut[y][PMUX_LUT_OFFSET];
muxreg = bfin_read_PORT_MUX();
if (offset != 1) {
muxreg &= ~(1 << offset);
} else {
muxreg &= ~(3 << 1);
}
muxreg |= (function << offset);
bfin_write_PORT_MUX(muxreg);
}
}
}
#else
# define portmux_setup(...) do { } while (0)
#endif
static void default_gpio(unsigned short gpio)
{
unsigned short bank, bitmask;
bank = gpio_bank(gpio);
bitmask = gpio_bit(gpio);
gpio_bankb[bank]->maska_clear = bitmask;
gpio_bankb[bank]->maskb_clear = bitmask;
SSYNC();
gpio_bankb[bank]->inen &= ~bitmask;
gpio_bankb[bank]->dir &= ~bitmask;
gpio_bankb[bank]->polar &= ~bitmask;
gpio_bankb[bank]->both &= ~bitmask;
gpio_bankb[bank]->edge &= ~bitmask;
}
static int __init bfin_gpio_init(void)
{
str_ident = kzalloc(RESOURCE_LABEL_SIZE * 256, GFP_KERNEL);
if (!str_ident)
return -ENOMEM;
printk(KERN_INFO "Blackfin GPIO Controller\n");
return 0;
}
arch_initcall(bfin_gpio_init);
/***********************************************************
*
* 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 short gpio, unsigned short arg) \
{ \
unsigned long flags; \
BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
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); \
local_irq_restore(flags); \
} \
EXPORT_SYMBOL(set_gpio_ ## name);
SET_GPIO(dir)
SET_GPIO(inen)
SET_GPIO(polar)
SET_GPIO(edge)
SET_GPIO(both)
#define SET_GPIO_SC(name) \
void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \
{ \
BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
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);
SET_GPIO_SC(maska)
SET_GPIO_SC(maskb)
#if ANOMALY_05000311
void set_gpio_data(unsigned short gpio, unsigned short arg)
{
unsigned long flags;
BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
local_irq_save(flags);
if (arg)
gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
else
gpio_bankb[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
bfin_read_CHIPID();
local_irq_restore(flags);
}
EXPORT_SYMBOL(set_gpio_data);
#else
SET_GPIO_SC(data)
#endif
#if ANOMALY_05000311
void set_gpio_toggle(unsigned short gpio)
{
unsigned long flags;
BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
local_irq_save(flags);
gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
bfin_read_CHIPID();
local_irq_restore(flags);
}
#else
void set_gpio_toggle(unsigned short gpio)
{
BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
}
#endif
EXPORT_SYMBOL(set_gpio_toggle);
/*Set current PORT date (16-bit word)*/
#define SET_GPIO_P(name) \
void set_gpiop_ ## name(unsigned short gpio, unsigned short arg) \
{ \
gpio_bankb[gpio_bank(gpio)]->name = arg; \
} \
EXPORT_SYMBOL(set_gpiop_ ## name);
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)
#if ANOMALY_05000311
void set_gpiop_data(unsigned short gpio, unsigned short arg)
{
unsigned long flags;
local_irq_save(flags);
gpio_bankb[gpio_bank(gpio)]->data = arg;
bfin_read_CHIPID();
local_irq_restore(flags);
}
EXPORT_SYMBOL(set_gpiop_data);
#else
SET_GPIO_P(data)
#endif
/* Get a specific bit */
#define GET_GPIO(name) \
unsigned short get_gpio_ ## name(unsigned short gpio) \
{ \
return (0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio))); \
} \
EXPORT_SYMBOL(get_gpio_ ## name);
GET_GPIO(dir)
GET_GPIO(inen)
GET_GPIO(polar)
GET_GPIO(edge)
GET_GPIO(both)
GET_GPIO(maska)
GET_GPIO(maskb)
#if ANOMALY_05000311
unsigned short get_gpio_data(unsigned short gpio)
{
unsigned long flags;
unsigned short ret;
BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
local_irq_save(flags);
ret = 0x01 & (gpio_bankb[gpio_bank(gpio)]->data >> gpio_sub_n(gpio));
bfin_read_CHIPID();
local_irq_restore(flags);
return ret;
}
EXPORT_SYMBOL(get_gpio_data);
#else
GET_GPIO(data)
#endif
/*Get current PORT date (16-bit word)*/
#define GET_GPIO_P(name) \
unsigned short get_gpiop_ ## name(unsigned short gpio) \
{ \
return (gpio_bankb[gpio_bank(gpio)]->name);\
} \
EXPORT_SYMBOL(get_gpiop_ ## name);
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)
#if ANOMALY_05000311
unsigned short get_gpiop_data(unsigned short gpio)
{
unsigned long flags;
unsigned short ret;
local_irq_save(flags);
ret = gpio_bankb[gpio_bank(gpio)]->data;
bfin_read_CHIPID();
local_irq_restore(flags);
return ret;
}
EXPORT_SYMBOL(get_gpiop_data);
#else
GET_GPIO_P(data)
#endif
#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 short 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 short 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 short 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 gpio_pm_setup(void)
{
u32 sic_iwr = 0;
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) {
#ifdef 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) {
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;
}
sic_iwr |= 1 <<
(sic_iwr_irqs[bank] - (IRQ_CORETMR + 1));
gpio_bankb[bank]->maskb_set = wakeup_map[gpio_bank(i)];
}
}
if (sic_iwr)
return sic_iwr;
else
return IWR_ENABLE_ALL;
}
void gpio_pm_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) {
#ifdef 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;
}
gpio_bankb[bank]->maskb = gpio_bank_saved[bank].maskb;
}
}
#endif
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))) {
printk(KERN_ERR
"%s: Peripheral %d is already reserved as GPIO by %s !\n",
__FUNCTION__, ident, get_label(ident));
dump_stack();
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;
printk(KERN_ERR
"%s: Peripheral %d function %d is already"
"reserved by %s !\n",
__FUNCTION__, ident, P_FUNCT2MUX(per),
get_label(ident));
dump_stack();
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);
int peripheral_request_list(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);
local_irq_restore(flags);
}
EXPORT_SYMBOL(peripheral_free);
void peripheral_free_list(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 - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
*
*
* DESCRIPTION: Blackfin GPIO Driver API
*
* CAUTION:
*************************************************************
* MODIFICATION HISTORY :
**************************************************************/
int gpio_request(unsigned short gpio, const char *label)
{
unsigned long flags;
if (check_gpio(gpio) < 0)
return -EINVAL;
local_irq_save(flags);
if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved!\n", gpio);
dump_stack();
local_irq_restore(flags);
return -EBUSY;
}
reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);
local_irq_restore(flags);
port_setup(gpio, GPIO_USAGE);
return 0;
}
EXPORT_SYMBOL(gpio_request);
void gpio_free(unsigned short 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)))) {
printk(KERN_ERR "bfin-gpio: GPIO %d wasn't reserved!\n", gpio);
dump_stack();
local_irq_restore(flags);
return;
}
default_gpio(gpio);
reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_free);
void gpio_direction_input(unsigned short gpio)
{
unsigned long flags;
BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
local_irq_save(flags);
gpio_bankb[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
gpio_bankb[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_direction_input);
void gpio_direction_output(unsigned short gpio)
{
unsigned long flags;
BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
local_irq_save(flags);
gpio_bankb[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
gpio_bankb[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_direction_output);
