int gpio_request(unsigned gpio, const char *label)
{
if (check_gpio(gpio) < 0)
return -EINVAL;
/*
* Allow that the identical GPIO can
* be requested from the same driver twice
* Do nothing and return -
*/
if (cmp_label(gpio, label) == 0)
return 0;
if (unlikely(is_reserved(gpio, gpio, 1))) {
printf("bfin-gpio: GPIO %d is already reserved by %s !\n",
gpio, get_label(gpio));
return -EBUSY;
}
if (unlikely(is_reserved(peri, gpio, 1))) {
printf("bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
gpio, get_label(gpio));
return -EBUSY;
}
else { /* Reset POLAR setting when acquiring a gpio for the first time */
set_gpio_polar(gpio, 0);
}
reserve(gpio, gpio);
set_label(gpio, label);
port_setup(gpio, GPIO_USAGE);
return 0;
}
/**
* Request a gpio before using it.
*
* NOTE: Argument 'label' is unused.
*/
int gpio_request(unsigned gpio, const char *label)
{
if (check_gpio(gpio) < 0)
return -1;
return 0;
}
/**
* gpio_set_value - Modify the value of the pin with specified value
* @gpio: gpio pin number within the device
* @value: value used to modify the value of the specified pin
*
* This function calculates the register offset (i.e to lower 16 bits or
* upper 16 bits) based on the given pin number and sets the value of a
* gpio pin to the specified value. The value is either 0 or non-zero.
*/
int gpio_set_value(unsigned gpio, int value)
{
unsigned int reg_offset, bank_num, bank_pin_num;
if (check_gpio(gpio) < 0)
return -1;
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num);
if (bank_pin_num >= ZYNQ_GPIO_MID_PIN_NUM) {
/* only 16 data bits in bit maskable reg */
bank_pin_num -= ZYNQ_GPIO_MID_PIN_NUM;
reg_offset = ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num);
} else {
reg_offset = ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num);
}
/*
* get the 32 bit value to be written to the mask/data register where
* the upper 16 bits is the mask and lower 16 bits is the data
*/
value = !!value;
value = ~(1 << (bank_pin_num + ZYNQ_GPIO_MID_PIN_NUM)) &
((value << bank_pin_num) | ZYNQ_GPIO_UPPER_MASK);
writel(value, ZYNQ_GPIO_BASE_ADDRESS + reg_offset);
return 0;
}
/**
* Get value of the specified gpio
*/
int gpio_get_value(unsigned gpio)
{
const struct gpio_bank *bank;
void *reg;
int input;
if (check_gpio(gpio) < 0)
return -1;
bank = get_gpio_bank(gpio);
reg = bank->base;
switch (bank->method) {
case METHOD_GPIO_24XX:
input = _get_gpio_direction(bank, get_gpio_index(gpio));
switch (input) {
case OMAP_GPIO_DIR_IN:
reg += OMAP_GPIO_DATAIN;
break;
case OMAP_GPIO_DIR_OUT:
reg += OMAP_GPIO_DATAOUT;
break;
default:
return -1;
}
break;
default:
return -1;
}
return (__raw_readl(reg)
& (1 << get_gpio_index(gpio))) != 0;
}
/*!
* Release ownership for a GPIO pin
* @param pin a name defined by \b iomux_pin_name_t
*/
void mxc_free_gpio(iomux_pin_name_t pin)
{
struct gpio_port *port;
u32 index, gpio = IOMUX_TO_GPIO(pin);
if (check_gpio(gpio) < 0)
return;
port = get_gpio_port(gpio);
index = GPIO_TO_INDEX(gpio);
spin_lock(&port->lock);
if ((!(port->reserved_map & (1 << index)))) {
printk(KERN_ERR "GPIO port %d, pin %d wasn't reserved!\n",
port->num, index);
dump_stack();
spin_unlock(&port->lock);
return;
}
port->reserved_map &= ~(1 << index);
port->irq_is_level_map &= ~(1 << index);
_set_gpio_direction(port, index, 1);
_set_gpio_irqenable(port, index, 0);
_clear_gpio_irqstatus(port, index);
spin_unlock(&port->lock);
}
int omap_request_gpio(int gpio)
{
if (check_gpio(gpio) < 0)
return -EINVAL;
return 0;
}
int pnx_gpio_read_pin(int gpio)
{
struct gpio_bank *bank;
void __iomem *reg;
u32 l = 0;
int irq, index;
if (!check_gpio(gpio))
return -EINVAL;
bank = get_gpio_bank(gpio);
index = get_gpio_index(gpio);
if (!check_gpio_requested(bank, index))
return -EINVAL;
/* check if the GPIO is used as extint */
irq = pnx_gpio_to_extint(gpio);
if (irq >= 0) {
/* and if it's an alternate internal signal */
/* (cf PNX67xx datasheet table 444)*/
reg = (void __iomem*) EXTINT_CFGx(irq);
l = __raw_readl(reg);
if (l & EXTINT_SEL_ALTERNATE) {
reg = (void __iomem*) EXTINT_SIGNAL_REG;
return (__raw_readl(reg) & (1 << irq)) !=0;
}
}
reg = bank->gpio_base;
reg += PNX_GPIO_PINS_OFFSET;
return (__raw_readl(reg) & (1 << index)) != 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) || \
defined(CONFIG_BF50x)
if (usage == GPIO_USAGE)
*port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
else
*port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
SSYNC();
#endif
}
int peripheral_request(unsigned short per, const char *label)
{
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);
/* 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))) {
printf("%s: Peripheral %d is already reserved as GPIO by %s !\n",
__func__, ident, get_label(ident));
return -EBUSY;
}
if (unlikely(is_reserved(peri, ident, 1))) {
/*
* 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;
printf("%s: Peripheral %d function %d is already reserved by %s !\n",
__func__, ident, P_FUNCT2MUX(per), get_label(ident));
return -EBUSY;
}
}
anyway:
reserve(peri, ident);
portmux_setup(per);
port_setup(ident, PERIPHERAL_USAGE);
set_label(ident, label);
return 0;
}
void omap_set_gpio_direction(int gpio, int is_input)
{
struct gpio_bank *bank;
if (check_gpio(gpio) < 0)
return;
bank = get_gpio_bank(gpio);
_set_gpio_direction(bank, get_gpio_index(gpio), is_input);
}
void omap_set_gpio_dataout(int gpio, int enable)
{
struct gpio_bank *bank;
if (check_gpio(gpio) < 0)
return;
bank = get_gpio_bank(gpio);
_set_gpio_dataout(bank, get_gpio_index(gpio), enable);
}
void omap_free_gpio(int gpio)
{
struct gpio_bank *bank;
if (check_gpio(gpio) < 0)
return;
bank = get_gpio_bank(gpio);
_reset_gpio(bank, gpio);
}
/*
* ubi_port_setup()
*/
static void ubi_port_setup(unsigned gpio, unsigned short usage)
{
if (!check_gpio(gpio)) {
if (usage) {
UBICOM32_GPIO_ENABLE(gpio);
} else {
UBICOM32_GPIO_DISABLE(gpio);
}
}
}
/**
* Set value of the specified gpio
*/
int gpio_set_value(unsigned gpio, int value)
{
const struct gpio_bank *bank;
if (check_gpio(gpio) < 0)
return -1;
bank = get_gpio_bank(gpio);
_set_gpio_dataout(bank, get_gpio_index(gpio), value);
return 0;
}
void omap_free_gpio(int gpio)
{
#if !defined (CONFIG_OMAP3_CE30X) && !defined (CONFIG_OMAP3_A317)
struct gpio_bank *bank;
if (check_gpio(gpio) < 0)
return;
bank = get_gpio_bank(gpio);
_reset_gpio(bank, gpio);
#endif
}
/*!
* Return the data value of a GPIO signal.
* @param pin a name defined by \b iomux_pin_name_t
*
* @return value (0 or 1) of the GPIO signal; -1 if pass in invalid pin
*/
int mxc_get_gpio_datain(iomux_pin_name_t pin)
{
struct gpio_port *port;
u32 gpio = IOMUX_TO_GPIO(pin);
if (check_gpio(gpio) < 0)
return -1;
port = get_gpio_port(gpio);
return (__raw_readl(port->base + GPIO_DR) >> GPIO_TO_INDEX(gpio)) & 1;
}
/**
* Set gpio direction as input
*/
int gpio_direction_input(unsigned gpio)
{
const struct gpio_bank *bank;
if (check_gpio(gpio) < 0)
return -1;
bank = get_gpio_bank(gpio);
_set_gpio_direction(bank, get_gpio_index(gpio), 1);
return 0;
}
void pnx_gpio_free(int gpio)
{
int index;
struct gpio_bank *bank;
if (!check_gpio(gpio))
return;
index = get_gpio_index(gpio);
bank = get_gpio_bank(gpio);
_pnx_gpio_free(bank, index);
}
/*!
* Exported function to set a GPIO pin's direction
* @param pin a name defined by \b iomux_pin_name_t
* @param is_input 1 (or non-zero) for input; 0 for output
*/
void mxc_set_gpio_direction(iomux_pin_name_t pin, int is_input)
{
struct gpio_port *port;
u32 gpio = IOMUX_TO_GPIO(pin);
if (check_gpio(gpio) < 0)
return;
port = get_gpio_port(gpio);
spin_lock(&port->lock);
_set_gpio_direction(port, GPIO_TO_INDEX(gpio), is_input);
spin_unlock(&port->lock);
}
/*!
* Request ownership for a GPIO pin. The caller has to check the return value
* of this function to make sure it returns 0 before make use of that pin.
* @param pin a name defined by \b iomux_pin_name_t
* @return 0 if successful; Non-zero otherwise
*/
int mxc_request_gpio(iomux_pin_name_t pin)
{
struct gpio_port *port;
u32 index, gpio = IOMUX_TO_GPIO(pin);
if (check_gpio(gpio) < 0)
return -EINVAL;
port = get_gpio_port(gpio);
index = GPIO_TO_INDEX(gpio);
return _request_gpio(port, index);
}
/*!
* Exported function to set a GPIO pin's data output
* @param pin a name defined by \b iomux_pin_name_t
* @param data value to be set (only 0 or 1 is valid)
*/
void mxc_set_gpio_dataout(iomux_pin_name_t pin, u32 data)
{
struct gpio_port *port;
u32 gpio = IOMUX_TO_GPIO(pin);
if (check_gpio(gpio) < 0)
return;
port = get_gpio_port(gpio);
spin_lock(&port->lock);
_set_gpio_dataout(port, GPIO_TO_INDEX(gpio), (data == 0) ? 0 : 1);
spin_unlock(&port->lock);
}
int pnx_gpio_request(int gpio)
{
int index;
struct gpio_bank *bank;
if (!check_gpio(gpio))
return -EINVAL;
index = get_gpio_index(gpio);
bank = get_gpio_bank(gpio);
return _pnx_gpio_request(bank, index);
}
/**
* gpio_get_value - Get the state of the specified pin of GPIO device
* @gpio: gpio pin number within the device
*
* This function reads the state of the specified pin of the GPIO device.
*
* Return: 0 if the pin is low, 1 if pin is high.
*/
int gpio_get_value(unsigned gpio)
{
u32 data;
unsigned int bank_num, bank_pin_num;
if (check_gpio(gpio) < 0)
return -1;
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num);
data = readl(ZYNQ_GPIO_BASE_ADDRESS +
ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
return (data >> bank_pin_num) & 1;
}
int gpio_free(unsigned gpio)
{
if (check_gpio(gpio) < 0)
return -1;
if (unlikely(!is_reserved(gpio, gpio, 0))) {
gpio_error(gpio);
return -1;
}
unreserve(gpio, gpio);
set_label(gpio, "free");
return 0;
}
void gpio_labels(void)
{
int c, gpio;
for (c = 0; c < MAX_RESOURCES; c++) {
gpio = is_reserved(gpio, c, 1);
if (!check_gpio(c) && gpio)
printf("GPIO_%d:\t%s\tGPIO %s\n", c,
get_label(c),
get_gpio_dir(c) ? "OUTPUT" : "INPUT");
else if (is_reserved(peri, c, 1))
printf("GPIO_%d:\t%s\tPeripheral\n", c, get_label(c));
else
continue;
}
}
void Button< driver >::handle_callback(){
state_t new_state = check_gpio();
// Transition!
if(state != new_state){
state = new_state;
switch(new_state){
case ST_PRESSED:
if(press_handler){
press_handler(press_param);
}
case ST_RELEASED:
if(release_handler){
release_handler(release_param);
}
}
}
}
int pnx_gpio_write_pin(int gpio, int gpio_value)
{
struct gpio_bank *bank;
unsigned long index;
if (!check_gpio(gpio))
return -EINVAL;
bank = get_gpio_bank(gpio);
index = get_gpio_index(gpio);
if (!check_gpio_requested(bank, index))
return -EINVAL;
spin_lock(&bank->lock);
_write_gpio_pin(bank, index, gpio_value);
spin_unlock(&bank->lock);
return 0;
}
int omap_get_gpio_datain(int gpio)
{
struct gpio_bank *bank;
void *reg;
if (check_gpio(gpio) < 0)
return -EINVAL;
bank = get_gpio_bank(gpio);
reg = bank->base;
switch (bank->method) {
case METHOD_GPIO_24XX:
reg += OMAP24XX_GPIO_DATAIN;
break;
default:
return -EINVAL;
}
return (__raw_readl(reg)
& (1 << get_gpio_index(gpio))) != 0;
}
int pnx_gpio_set_mode(int gpio, int mode)
{
struct gpio_bank *bank;
int index;
if (!check_gpio(gpio))
return -EINVAL;
bank = get_gpio_bank(gpio);
index = get_gpio_index(gpio);
if (!check_gpio_requested(bank, index))
return -EINVAL;
spin_lock(&bank->lock);
_set_gpio_mode(bank, get_gpio_index(gpio), mode);
spin_unlock(&bank->lock);
return 0;
}
/*
* gpio_proc_read()
*/
static int ubi_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_UBICOM_GPIOS; c++) {
if (!check_gpio(c) &&
(reserved_gpio_map[gpio_bank(c)] & gpio_bit(c))) {
len = sprintf(buf, "GPIO_%d:\t\tGPIO %s\n", c,
ubi_get_gpio_dir(c) ? "OUTPUT" : "INPUT");
} else {
continue;
}
buf += len;
outlen += len;
}
return outlen;
}
