// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Xilinx Zynq GPIO device driver
*
* Copyright ( C ) 2009 - 2014 Xilinx , Inc .
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#define DRIVER_NAME "zynq-gpio"
/* Maximum banks */
#define ZYNQ_GPIO_MAX_BANK 4
#define ZYNQMP_GPIO_MAX_BANK 6
#define VERSAL_GPIO_MAX_BANK 4
#define PMC_GPIO_MAX_BANK 5
#define VERSAL_UNUSED_BANKS 2
#define ZYNQ_GPIO_BANK0_NGPIO 32
#define ZYNQ_GPIO_BANK1_NGPIO 22
#define ZYNQ_GPIO_BANK2_NGPIO 32
#define ZYNQ_GPIO_BANK3_NGPIO 32
#define ZYNQMP_GPIO_BANK0_NGPIO 26
#define ZYNQMP_GPIO_BANK1_NGPIO 26
#define ZYNQMP_GPIO_BANK2_NGPIO 26
#define ZYNQMP_GPIO_BANK3_NGPIO 32
#define ZYNQMP_GPIO_BANK4_NGPIO 32
#define ZYNQMP_GPIO_BANK5_NGPIO 32
#define ZYNQ_GPIO_NR_GPIOS 118
#define ZYNQMP_GPIO_NR_GPIOS 174
#define ZYNQ_GPIO_BANK0_PIN_MIN(str) 0
#define ZYNQ_GPIO_BANK0_PIN_MAX(str) (ZYNQ_GPIO_BANK0_PIN_MIN(str) + \
ZYNQ## str## _GPIO_BANK0_NGPIO - 1 )
#define ZYNQ_GPIO_BANK1_PIN_MIN(str) (ZYNQ_GPIO_BANK0_PIN_MAX(str) + 1 )
#define ZYNQ_GPIO_BANK1_PIN_MAX(str) (ZYNQ_GPIO_BANK1_PIN_MIN(str) + \
ZYNQ## str## _GPIO_BANK1_NGPIO - 1 )
#define ZYNQ_GPIO_BANK2_PIN_MIN(str) (ZYNQ_GPIO_BANK1_PIN_MAX(str) + 1 )
#define ZYNQ_GPIO_BANK2_PIN_MAX(str) (ZYNQ_GPIO_BANK2_PIN_MIN(str) + \
ZYNQ## str## _GPIO_BANK2_NGPIO - 1 )
#define ZYNQ_GPIO_BANK3_PIN_MIN(str) (ZYNQ_GPIO_BANK2_PIN_MAX(str) + 1 )
#define ZYNQ_GPIO_BANK3_PIN_MAX(str) (ZYNQ_GPIO_BANK3_PIN_MIN(str) + \
ZYNQ## str## _GPIO_BANK3_NGPIO - 1 )
#define ZYNQ_GPIO_BANK4_PIN_MIN(str) (ZYNQ_GPIO_BANK3_PIN_MAX(str) + 1 )
#define ZYNQ_GPIO_BANK4_PIN_MAX(str) (ZYNQ_GPIO_BANK4_PIN_MIN(str) + \
ZYNQ## str## _GPIO_BANK4_NGPIO - 1 )
#define ZYNQ_GPIO_BANK5_PIN_MIN(str) (ZYNQ_GPIO_BANK4_PIN_MAX(str) + 1 )
#define ZYNQ_GPIO_BANK5_PIN_MAX(str) (ZYNQ_GPIO_BANK5_PIN_MIN(str) + \
ZYNQ## str## _GPIO_BANK5_NGPIO - 1 )
/* Register offsets for the GPIO device */
/* LSW Mask & Data -WO */
#define ZYNQ_GPIO_DATA_LSW_OFFSET(BANK) (0 x000 + (8 * BANK))
/* MSW Mask & Data -WO */
#define ZYNQ_GPIO_DATA_MSW_OFFSET(BANK) (0 x004 + (8 * BANK))
/* Data Register-RW */
#define ZYNQ_GPIO_DATA_OFFSET(BANK) (0 x040 + (4 * BANK))
#define ZYNQ_GPIO_DATA_RO_OFFSET(BANK) (0 x060 + (4 * BANK))
/* Direction mode reg-RW */
#define ZYNQ_GPIO_DIRM_OFFSET(BANK) (0 x204 + (0 x40 * BANK))
/* Output enable reg-RW */
#define ZYNQ_GPIO_OUTEN_OFFSET(BANK) (0 x208 + (0 x40 * BANK))
/* Interrupt mask reg-RO */
#define ZYNQ_GPIO_INTMASK_OFFSET(BANK) (0 x20C + (0 x40 * BANK))
/* Interrupt enable reg-WO */
#define ZYNQ_GPIO_INTEN_OFFSET(BANK) (0 x210 + (0 x40 * BANK))
/* Interrupt disable reg-WO */
#define ZYNQ_GPIO_INTDIS_OFFSET(BANK) (0 x214 + (0 x40 * BANK))
/* Interrupt status reg-RO */
#define ZYNQ_GPIO_INTSTS_OFFSET(BANK) (0 x218 + (0 x40 * BANK))
/* Interrupt type reg-RW */
#define ZYNQ_GPIO_INTTYPE_OFFSET(BANK) (0 x21C + (0 x40 * BANK))
/* Interrupt polarity reg-RW */
#define ZYNQ_GPIO_INTPOL_OFFSET(BANK) (0 x220 + (0 x40 * BANK))
/* Interrupt on any, reg-RW */
#define ZYNQ_GPIO_INTANY_OFFSET(BANK) (0 x224 + (0 x40 * BANK))
/* Disable all interrupts mask */
#define ZYNQ_GPIO_IXR_DISABLE_ALL 0 xFFFFFFFF
/* Mid pin number of a bank */
#define ZYNQ_GPIO_MID_PIN_NUM 16
/* GPIO upper 16 bit mask */
#define ZYNQ_GPIO_UPPER_MASK 0 xFFFF0000
/* set to differentiate zynq from zynqmp, 0=zynqmp, 1=zynq */
#define ZYNQ_GPIO_QUIRK_IS_ZYNQ BIT(0 )
#define GPIO_QUIRK_DATA_RO_BUG BIT(1 )
#define GPIO_QUIRK_VERSAL BIT(2 )
struct gpio_regs {
u32 datamsw[ZYNQMP_GPIO_MAX_BANK];
u32 datalsw[ZYNQMP_GPIO_MAX_BANK];
u32 dirm[ZYNQMP_GPIO_MAX_BANK];
u32 outen[ZYNQMP_GPIO_MAX_BANK];
u32 int_en[ZYNQMP_GPIO_MAX_BANK];
u32 int_dis[ZYNQMP_GPIO_MAX_BANK];
u32 int_type[ZYNQMP_GPIO_MAX_BANK];
u32 int_polarity[ZYNQMP_GPIO_MAX_BANK];
u32 int_any[ZYNQMP_GPIO_MAX_BANK];
};
/**
* struct zynq_gpio - gpio device private data structure
* @ chip : instance of the gpio_chip
* @ base_addr : base address of the GPIO device
* @ clk : clock resource for this controller
* @ irq : interrupt for the GPIO device
* @ p_data : pointer to platform data
* @ context : context registers
* @ dirlock : lock used for direction in / out synchronization
*/
struct zynq_gpio {
struct gpio_chip chip;
void __iomem *base_addr;
struct clk *clk;
int irq;
const struct zynq_platform_data *p_data;
struct gpio_regs context;
spinlock_t dirlock; /* lock */
};
/**
* struct zynq_platform_data - zynq gpio platform data structure
* @ label : string to store in gpio - > label
* @ quirks : Flags is used to identify the platform
* @ ngpio : max number of gpio pins
* @ max_bank : maximum number of gpio banks
* @ bank_min : this array represents bank ' s min pin
* @ bank_max : this array represents bank ' s max pin
*/
struct zynq_platform_data {
const char *label;
u32 quirks;
u16 ngpio;
int max_bank;
int bank_min[ZYNQMP_GPIO_MAX_BANK];
int bank_max[ZYNQMP_GPIO_MAX_BANK];
};
static const struct irq_chip zynq_gpio_level_irqchip;
static const struct irq_chip zynq_gpio_edge_irqchip;
/**
* zynq_gpio_is_zynq - test if HW is zynq or zynqmp
* @ gpio : Pointer to driver data struct
*
* Return : 0 if zynqmp , 1 if zynq .
*/
static int zynq_gpio_is_zynq(struct zynq_gpio *gpio)
{
return !!(gpio->p_data->quirks & ZYNQ_GPIO_QUIRK_IS_ZYNQ);
}
/**
* gpio_data_ro_bug - test if HW bug exists or not
* @ gpio : Pointer to driver data struct
*
* Return : 0 if bug doesnot exist , 1 if bug exists .
*/
static int gpio_data_ro_bug(struct zynq_gpio *gpio)
{
return !!(gpio->p_data->quirks & GPIO_QUIRK_DATA_RO_BUG);
}
/**
* zynq_gpio_get_bank_pin - Get the bank number and pin number within that bank
* for a given pin in the GPIO device
* @ pin_num : gpio pin number within the device
* @ bank_num : an output parameter used to return the bank number of the gpio
* pin
* @ bank_pin_num : an output parameter used to return pin number within a bank
* for the given gpio pin
* @ gpio : gpio device data structure
*
* Returns the bank number and pin offset within the bank .
*/
static inline void zynq_gpio_get_bank_pin(unsigned int pin_num,
unsigned int *bank_num,
unsigned int *bank_pin_num,
struct zynq_gpio *gpio)
{
int bank;
for (bank = 0 ; bank < gpio->p_data->max_bank; bank++) {
if ((pin_num >= gpio->p_data->bank_min[bank]) &&
(pin_num <= gpio->p_data->bank_max[bank])) {
*bank_num = bank;
*bank_pin_num = pin_num -
gpio->p_data->bank_min[bank];
return ;
}
if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
bank = bank + VERSAL_UNUSED_BANKS;
}
/* default */
WARN(true , "invalid GPIO pin number: %u" , pin_num);
*bank_num = 0 ;
*bank_pin_num = 0 ;
}
/**
* zynq_gpio_get_value - Get the state of the specified pin of GPIO device
* @ chip : gpio_chip instance to be worked on
* @ pin : 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 .
*/
static int zynq_gpio_get_value(struct gpio_chip *chip, unsigned int pin)
{
u32 data;
unsigned int bank_num, bank_pin_num;
struct zynq_gpio *gpio = gpiochip_get_data(chip);
zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
if (gpio_data_ro_bug(gpio)) {
if (zynq_gpio_is_zynq(gpio)) {
if (bank_num <= 1 ) {
data = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
} else {
data = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DATA_OFFSET(bank_num));
}
} else {
if (bank_num <= 2 ) {
data = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
} else {
data = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DATA_OFFSET(bank_num));
}
}
} else {
data = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
}
return (data >> bank_pin_num) & 1 ;
}
/**
* zynq_gpio_set_value - Modify the state of the pin with specified value
* @ chip : gpio_chip instance to be worked on
* @ pin : gpio pin number within the device
* @ state : value used to modify the state 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 state of a
* gpio pin to the specified value . The state is either 0 or non - zero .
*/
static int zynq_gpio_set_value(struct gpio_chip *chip, unsigned int pin,
int state)
{
unsigned int reg_offset, bank_num, bank_pin_num;
struct zynq_gpio *gpio = gpiochip_get_data(chip);
zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
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
*/
state = !!state;
state = ~(1 << (bank_pin_num + ZYNQ_GPIO_MID_PIN_NUM)) &
((state << bank_pin_num) | ZYNQ_GPIO_UPPER_MASK);
writel_relaxed(state, gpio->base_addr + reg_offset);
return 0 ;
}
/**
* zynq_gpio_dir_in - Set the direction of the specified GPIO pin as input
* @ chip : gpio_chip instance to be worked on
* @ pin : gpio pin number within the device
*
* This function uses the read - modify - write sequence to set the direction of
* the gpio pin as input .
*
* Return : 0 always
*/
static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin)
{
u32 reg;
unsigned int bank_num, bank_pin_num;
unsigned long flags;
struct zynq_gpio *gpio = gpiochip_get_data(chip);
zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
/*
* On zynq bank 0 pins 7 and 8 are special and cannot be used
* as inputs .
*/
if (zynq_gpio_is_zynq(gpio) && bank_num == 0 &&
(bank_pin_num == 7 || bank_pin_num == 8 ))
return -EINVAL;
/* clear the bit in direction mode reg to set the pin as input */
spin_lock_irqsave(&gpio->dirlock, flags);
reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
reg &= ~BIT(bank_pin_num);
writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
spin_unlock_irqrestore(&gpio->dirlock, flags);
return 0 ;
}
/**
* zynq_gpio_dir_out - Set the direction of the specified GPIO pin as output
* @ chip : gpio_chip instance to be worked on
* @ pin : gpio pin number within the device
* @ state : value to be written to specified pin
*
* This function sets the direction of specified GPIO pin as output , configures
* the Output Enable register for the pin and uses zynq_gpio_set to set
* the state of the pin to the value specified .
*
* Return : 0 always
*/
static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin,
int state)
{
u32 reg;
unsigned int bank_num, bank_pin_num;
unsigned long flags;
struct zynq_gpio *gpio = gpiochip_get_data(chip);
zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
/* set the GPIO pin as output */
spin_lock_irqsave(&gpio->dirlock, flags);
reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
reg |= BIT(bank_pin_num);
writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
/* configure the output enable reg for the pin */
reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
reg |= BIT(bank_pin_num);
writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
spin_unlock_irqrestore(&gpio->dirlock, flags);
/* set the state of the pin */
zynq_gpio_set_value(chip, pin, state);
return 0 ;
}
/**
* zynq_gpio_get_direction - Read the direction of the specified GPIO pin
* @ chip : gpio_chip instance to be worked on
* @ pin : gpio pin number within the device
*
* This function returns the direction of the specified GPIO .
*
* Return : GPIO_LINE_DIRECTION_OUT or GPIO_LINE_DIRECTION_IN
*/
static int zynq_gpio_get_direction(struct gpio_chip *chip, unsigned int pin)
{
u32 reg;
unsigned int bank_num, bank_pin_num;
struct zynq_gpio *gpio = gpiochip_get_data(chip);
zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
if (reg & BIT(bank_pin_num))
return GPIO_LINE_DIRECTION_OUT;
return GPIO_LINE_DIRECTION_IN;
}
/**
* zynq_gpio_irq_mask - Disable the interrupts for a gpio pin
* @ irq_data : per irq and chip data passed down to chip functions
*
* This function calculates gpio pin number from irq number and sets the
* bit in the Interrupt Disable register of the corresponding bank to disable
* interrupts for that pin .
*/
static void zynq_gpio_irq_mask(struct irq_data *irq_data)
{
unsigned int device_pin_num, bank_num, bank_pin_num;
const unsigned long offset = irqd_to_hwirq(irq_data);
struct gpio_chip *chip = irq_data_get_irq_chip_data(irq_data);
struct zynq_gpio *gpio =
gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
gpiochip_disable_irq(chip, offset);
device_pin_num = irq_data->hwirq;
zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
writel_relaxed(BIT(bank_pin_num),
gpio->base_addr + ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
}
/**
* zynq_gpio_irq_unmask - Enable the interrupts for a gpio pin
* @ irq_data : irq data containing irq number of gpio pin for the interrupt
* to enable
*
* This function calculates the gpio pin number from irq number and sets the
* bit in the Interrupt Enable register of the corresponding bank to enable
* interrupts for that pin .
*/
static void zynq_gpio_irq_unmask(struct irq_data *irq_data)
{
unsigned int device_pin_num, bank_num, bank_pin_num;
const unsigned long offset = irqd_to_hwirq(irq_data);
struct gpio_chip *chip = irq_data_get_irq_chip_data(irq_data);
struct zynq_gpio *gpio =
gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
gpiochip_enable_irq(chip, offset);
device_pin_num = irq_data->hwirq;
zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
writel_relaxed(BIT(bank_pin_num),
gpio->base_addr + ZYNQ_GPIO_INTEN_OFFSET(bank_num));
}
/**
* zynq_gpio_irq_ack - Acknowledge the interrupt of a gpio pin
* @ irq_data : irq data containing irq number of gpio pin for the interrupt
* to ack
*
* This function calculates gpio pin number from irq number and sets the bit
* in the Interrupt Status Register of the corresponding bank , to ACK the irq .
*/
static void zynq_gpio_irq_ack(struct irq_data *irq_data)
{
unsigned int device_pin_num, bank_num, bank_pin_num;
struct zynq_gpio *gpio =
gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
device_pin_num = irq_data->hwirq;
zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
writel_relaxed(BIT(bank_pin_num),
gpio->base_addr + ZYNQ_GPIO_INTSTS_OFFSET(bank_num));
}
/**
* zynq_gpio_irq_enable - Enable the interrupts for a gpio pin
* @ irq_data : irq data containing irq number of gpio pin for the interrupt
* to enable
*
* Clears the INTSTS bit and unmasks the given interrupt .
*/
static void zynq_gpio_irq_enable(struct irq_data *irq_data)
{
/*
* The Zynq GPIO controller does not disable interrupt detection when
* the interrupt is masked and only disables the propagation of the
* interrupt . This means when the controller detects an interrupt
* condition while the interrupt is logically disabled it will propagate
* that interrupt event once the interrupt is enabled . This will cause
* the interrupt consumer to see spurious interrupts to prevent this
* first make sure that the interrupt is not asserted and then enable
* it .
*/
zynq_gpio_irq_ack(irq_data);
zynq_gpio_irq_unmask(irq_data);
}
/**
* zynq_gpio_set_irq_type - Set the irq type for a gpio pin
* @ irq_data : irq data containing irq number of gpio pin
* @ type : interrupt type that is to be set for the gpio pin
*
* This function gets the gpio pin number and its bank from the gpio pin number
* and configures the INT_TYPE , INT_POLARITY and INT_ANY registers .
*
* Return : 0 , negative error otherwise .
* TYPE - EDGE_RISING , INT_TYPE - 1 , INT_POLARITY - 1 , INT_ANY - 0 ;
* TYPE - EDGE_FALLING , INT_TYPE - 1 , INT_POLARITY - 0 , INT_ANY - 0 ;
* TYPE - EDGE_BOTH , INT_TYPE - 1 , INT_POLARITY - NA , INT_ANY - 1 ;
* TYPE - LEVEL_HIGH , INT_TYPE - 0 , INT_POLARITY - 1 , INT_ANY - NA ;
* TYPE - LEVEL_LOW , INT_TYPE - 0 , INT_POLARITY - 0 , INT_ANY - NA
*/
static int zynq_gpio_set_irq_type(struct irq_data *irq_data, unsigned int type)
{
u32 int_type, int_pol, int_any;
unsigned int device_pin_num, bank_num, bank_pin_num;
struct zynq_gpio *gpio =
gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
device_pin_num = irq_data->hwirq;
zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
int_type = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
int_pol = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
int_any = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_INTANY_OFFSET(bank_num));
/*
* based on the type requested , configure the INT_TYPE , INT_POLARITY
* and INT_ANY registers
*/
switch (type) {
case IRQ_TYPE_EDGE_RISING:
int_type |= BIT(bank_pin_num);
int_pol |= BIT(bank_pin_num);
int_any &= ~BIT(bank_pin_num);
break ;
case IRQ_TYPE_EDGE_FALLING:
int_type |= BIT(bank_pin_num);
int_pol &= ~BIT(bank_pin_num);
int_any &= ~BIT(bank_pin_num);
break ;
case IRQ_TYPE_EDGE_BOTH:
int_type |= BIT(bank_pin_num);
int_any |= BIT(bank_pin_num);
break ;
case IRQ_TYPE_LEVEL_HIGH:
int_type &= ~BIT(bank_pin_num);
int_pol |= BIT(bank_pin_num);
break ;
case IRQ_TYPE_LEVEL_LOW:
int_type &= ~BIT(bank_pin_num);
int_pol &= ~BIT(bank_pin_num);
break ;
default :
return -EINVAL;
}
writel_relaxed(int_type,
gpio->base_addr + ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
writel_relaxed(int_pol,
gpio->base_addr + ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
writel_relaxed(int_any,
gpio->base_addr + ZYNQ_GPIO_INTANY_OFFSET(bank_num));
if (type & IRQ_TYPE_LEVEL_MASK)
irq_set_chip_handler_name_locked(irq_data,
&zynq_gpio_level_irqchip,
handle_fasteoi_irq, NULL);
else
irq_set_chip_handler_name_locked(irq_data,
&zynq_gpio_edge_irqchip,
handle_level_irq, NULL);
return 0 ;
}
static int zynq_gpio_set_wake(struct irq_data *data, unsigned int on)
{
struct zynq_gpio *gpio =
gpiochip_get_data(irq_data_get_irq_chip_data(data));
irq_set_irq_wake(gpio->irq, on);
return 0 ;
}
static int zynq_gpio_irq_reqres(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
int ret;
ret = pm_runtime_resume_and_get(chip->parent);
if (ret < 0 )
return ret;
return gpiochip_reqres_irq(chip, d->hwirq);
}
static void zynq_gpio_irq_relres(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
gpiochip_relres_irq(chip, d->hwirq);
pm_runtime_put(chip->parent);
}
/* irq chip descriptor */
static const struct irq_chip zynq_gpio_level_irqchip = {
.name = DRIVER_NAME,
.irq_enable = zynq_gpio_irq_enable,
.irq_eoi = zynq_gpio_irq_ack,
.irq_mask = zynq_gpio_irq_mask,
.irq_unmask = zynq_gpio_irq_unmask,
.irq_set_type = zynq_gpio_set_irq_type,
.irq_set_wake = zynq_gpio_set_wake,
.irq_request_resources = zynq_gpio_irq_reqres,
.irq_release_resources = zynq_gpio_irq_relres,
.flags = IRQCHIP_EOI_THREADED | IRQCHIP_EOI_IF_HANDLED |
IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
};
static const struct irq_chip zynq_gpio_edge_irqchip = {
.name = DRIVER_NAME,
.irq_enable = zynq_gpio_irq_enable,
.irq_ack = zynq_gpio_irq_ack,
.irq_mask = zynq_gpio_irq_mask,
.irq_unmask = zynq_gpio_irq_unmask,
.irq_set_type = zynq_gpio_set_irq_type,
.irq_set_wake = zynq_gpio_set_wake,
.irq_request_resources = zynq_gpio_irq_reqres,
.irq_release_resources = zynq_gpio_irq_relres,
.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
};
static void zynq_gpio_handle_bank_irq(struct zynq_gpio *gpio,
unsigned int bank_num,
unsigned long pending)
{
unsigned int bank_offset = gpio->p_data->bank_min[bank_num];
struct irq_domain *irqdomain = gpio->chip.irq.domain;
int offset;
if (!pending)
return ;
for_each_set_bit(offset, &pending, 32 )
generic_handle_domain_irq(irqdomain, offset + bank_offset);
}
/**
* zynq_gpio_irqhandler - IRQ handler for the gpio banks of a gpio device
* @ desc : irq descriptor instance of the ' irq '
*
* This function reads the Interrupt Status Register of each bank to get the
* gpio pin number which has triggered an interrupt . It then acks the triggered
* interrupt and calls the pin specific handler set by the higher layer
* application for that pin .
* Note : A bug is reported if no handler is set for the gpio pin .
*/
static void zynq_gpio_irqhandler(struct irq_desc *desc)
{
u32 int_sts, int_enb;
unsigned int bank_num;
struct zynq_gpio *gpio =
gpiochip_get_data(irq_desc_get_handler_data(desc));
struct irq_chip *irqchip = irq_desc_get_chip(desc);
chained_irq_enter(irqchip, desc);
for (bank_num = 0 ; bank_num < gpio->p_data->max_bank; bank_num++) {
int_sts = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_INTSTS_OFFSET(bank_num));
int_enb = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_INTMASK_OFFSET(bank_num));
zynq_gpio_handle_bank_irq(gpio, bank_num, int_sts & ~int_enb);
if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
bank_num = bank_num + VERSAL_UNUSED_BANKS;
}
chained_irq_exit(irqchip, desc);
}
static void zynq_gpio_save_context(struct zynq_gpio *gpio)
{
unsigned int bank_num;
for (bank_num = 0 ; bank_num < gpio->p_data->max_bank; bank_num++) {
gpio->context.datalsw[bank_num] =
readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num));
gpio->context.datamsw[bank_num] =
readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num));
gpio->context.dirm[bank_num] = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DIRM_OFFSET(bank_num));
gpio->context.int_en[bank_num] = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_INTMASK_OFFSET(bank_num));
gpio->context.int_type[bank_num] =
readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
gpio->context.int_polarity[bank_num] =
readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
gpio->context.int_any[bank_num] =
readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_INTANY_OFFSET(bank_num));
if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
bank_num = bank_num + VERSAL_UNUSED_BANKS;
}
}
static void zynq_gpio_restore_context(struct zynq_gpio *gpio)
{
unsigned int bank_num;
for (bank_num = 0 ; bank_num < gpio->p_data->max_bank; bank_num++) {
writel_relaxed(ZYNQ_GPIO_IXR_DISABLE_ALL, gpio->base_addr +
ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
writel_relaxed(gpio->context.datalsw[bank_num],
gpio->base_addr +
ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num));
writel_relaxed(gpio->context.datamsw[bank_num],
gpio->base_addr +
ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num));
writel_relaxed(gpio->context.dirm[bank_num],
gpio->base_addr +
ZYNQ_GPIO_DIRM_OFFSET(bank_num));
writel_relaxed(gpio->context.int_type[bank_num],
gpio->base_addr +
ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
writel_relaxed(gpio->context.int_polarity[bank_num],
gpio->base_addr +
ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
writel_relaxed(gpio->context.int_any[bank_num],
gpio->base_addr +
ZYNQ_GPIO_INTANY_OFFSET(bank_num));
writel_relaxed(~(gpio->context.int_en[bank_num]),
gpio->base_addr +
ZYNQ_GPIO_INTEN_OFFSET(bank_num));
if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
bank_num = bank_num + VERSAL_UNUSED_BANKS;
}
}
static int __maybe_unused zynq_gpio_suspend(struct device *dev)
{
struct zynq_gpio *gpio = dev_get_drvdata(dev);
struct irq_data *data = irq_get_irq_data(gpio->irq);
if (!data) {
dev_err(dev, "irq_get_irq_data() failed\n" );
return -EINVAL;
}
if (!device_may_wakeup(dev))
disable_irq(gpio->irq);
if (!irqd_is_wakeup_set(data)) {
zynq_gpio_save_context(gpio);
return pm_runtime_force_suspend(dev);
}
return 0 ;
}
static int __maybe_unused zynq_gpio_resume(struct device *dev)
{
struct zynq_gpio *gpio = dev_get_drvdata(dev);
struct irq_data *data = irq_get_irq_data(gpio->irq);
int ret;
if (!data) {
dev_err(dev, "irq_get_irq_data() failed\n" );
return -EINVAL;
}
if (!device_may_wakeup(dev))
enable_irq(gpio->irq);
if (!irqd_is_wakeup_set(data)) {
ret = pm_runtime_force_resume(dev);
zynq_gpio_restore_context(gpio);
return ret;
}
return 0 ;
}
static int __maybe_unused zynq_gpio_runtime_suspend(struct device *dev)
{
struct zynq_gpio *gpio = dev_get_drvdata(dev);
clk_disable_unprepare(gpio->clk);
return 0 ;
}
static int __maybe_unused zynq_gpio_runtime_resume(struct device *dev)
{
struct zynq_gpio *gpio = dev_get_drvdata(dev);
return clk_prepare_enable(gpio->clk);
}
static int zynq_gpio_request(struct gpio_chip *chip, unsigned int offset)
{
int ret;
ret = pm_runtime_get_sync(chip->parent);
/*
* If the device is already active pm_runtime_get ( ) will return 1 on
* success , but gpio_request still needs to return 0 .
*/
return ret < 0 ? ret : 0 ;
}
static void zynq_gpio_free(struct gpio_chip *chip, unsigned int offset)
{
pm_runtime_put(chip->parent);
}
static const struct dev_pm_ops zynq_gpio_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(zynq_gpio_suspend, zynq_gpio_resume)
SET_RUNTIME_PM_OPS(zynq_gpio_runtime_suspend,
zynq_gpio_runtime_resume, NULL)
};
static const struct zynq_platform_data versal_gpio_def = {
.label = "versal_gpio" ,
.quirks = GPIO_QUIRK_VERSAL,
.ngpio = 58 ,
.max_bank = VERSAL_GPIO_MAX_BANK,
.bank_min[0 ] = 0 ,
.bank_max[0 ] = 25 , /* 0 to 25 are connected to MIOs (26 pins) */
.bank_min[3 ] = 26 ,
.bank_max[3 ] = 57 , /* Bank 3 is connected to FMIOs (32 pins) */
};
static const struct zynq_platform_data pmc_gpio_def = {
.label = "pmc_gpio" ,
.ngpio = 116 ,
.max_bank = PMC_GPIO_MAX_BANK,
.bank_min[0 ] = 0 ,
.bank_max[0 ] = 25 , /* 0 to 25 are connected to MIOs (26 pins) */
.bank_min[1 ] = 26 ,
.bank_max[1 ] = 51 , /* Bank 1 are connected to MIOs (26 pins) */
.bank_min[3 ] = 52 ,
.bank_max[3 ] = 83 , /* Bank 3 is connected to EMIOs (32 pins) */
.bank_min[4 ] = 84 ,
.bank_max[4 ] = 115 , /* Bank 4 is connected to EMIOs (32 pins) */
};
static const struct zynq_platform_data zynqmp_gpio_def = {
.label = "zynqmp_gpio" ,
.quirks = GPIO_QUIRK_DATA_RO_BUG,
.ngpio = ZYNQMP_GPIO_NR_GPIOS,
.max_bank = ZYNQMP_GPIO_MAX_BANK,
.bank_min[0 ] = ZYNQ_GPIO_BANK0_PIN_MIN(MP),
.bank_max[0 ] = ZYNQ_GPIO_BANK0_PIN_MAX(MP),
.bank_min[1 ] = ZYNQ_GPIO_BANK1_PIN_MIN(MP),
.bank_max[1 ] = ZYNQ_GPIO_BANK1_PIN_MAX(MP),
.bank_min[2 ] = ZYNQ_GPIO_BANK2_PIN_MIN(MP),
.bank_max[2 ] = ZYNQ_GPIO_BANK2_PIN_MAX(MP),
.bank_min[3 ] = ZYNQ_GPIO_BANK3_PIN_MIN(MP),
.bank_max[3 ] = ZYNQ_GPIO_BANK3_PIN_MAX(MP),
.bank_min[4 ] = ZYNQ_GPIO_BANK4_PIN_MIN(MP),
.bank_max[4 ] = ZYNQ_GPIO_BANK4_PIN_MAX(MP),
.bank_min[5 ] = ZYNQ_GPIO_BANK5_PIN_MIN(MP),
.bank_max[5 ] = ZYNQ_GPIO_BANK5_PIN_MAX(MP),
};
static const struct zynq_platform_data zynq_gpio_def = {
.label = "zynq_gpio" ,
.quirks = ZYNQ_GPIO_QUIRK_IS_ZYNQ | GPIO_QUIRK_DATA_RO_BUG,
.ngpio = ZYNQ_GPIO_NR_GPIOS,
.max_bank = ZYNQ_GPIO_MAX_BANK,
.bank_min[0 ] = ZYNQ_GPIO_BANK0_PIN_MIN(),
.bank_max[0 ] = ZYNQ_GPIO_BANK0_PIN_MAX(),
.bank_min[1 ] = ZYNQ_GPIO_BANK1_PIN_MIN(),
.bank_max[1 ] = ZYNQ_GPIO_BANK1_PIN_MAX(),
.bank_min[2 ] = ZYNQ_GPIO_BANK2_PIN_MIN(),
.bank_max[2 ] = ZYNQ_GPIO_BANK2_PIN_MAX(),
.bank_min[3 ] = ZYNQ_GPIO_BANK3_PIN_MIN(),
.bank_max[3 ] = ZYNQ_GPIO_BANK3_PIN_MAX(),
};
static const struct of_device_id zynq_gpio_of_match[] = {
{ .compatible = "xlnx,zynq-gpio-1.0" , .data = &zynq_gpio_def },
{ .compatible = "xlnx,zynqmp-gpio-1.0" , .data = &zynqmp_gpio_def },
{ .compatible = "xlnx,versal-gpio-1.0" , .data = &versal_gpio_def },
{ .compatible = "xlnx,pmc-gpio-1.0" , .data = &pmc_gpio_def },
{ /* end of table */ }
};
MODULE_DEVICE_TABLE(of, zynq_gpio_of_match);
/**
* zynq_gpio_probe - Initialization method for a zynq_gpio device
* @ pdev : platform device instance
*
* This function allocates memory resources for the gpio device and registers
* all the banks of the device . It will also set up interrupts for the gpio
* pins .
* Note : Interrupts are disabled for all the banks during initialization .
*
* Return : 0 on success , negative error otherwise .
*/
static int zynq_gpio_probe(struct platform_device *pdev)
{
int ret, bank_num;
struct zynq_gpio *gpio;
struct gpio_chip *chip;
struct gpio_irq_chip *girq;
const struct of_device_id *match;
gpio = devm_kzalloc(&pdev->dev, sizeof (*gpio), GFP_KERNEL);
if (!gpio)
return -ENOMEM;
match = of_match_node(zynq_gpio_of_match, pdev->dev.of_node);
if (!match) {
dev_err(&pdev->dev, "of_match_node() failed\n" );
return -EINVAL;
}
gpio->p_data = match->data;
platform_set_drvdata(pdev, gpio);
gpio->base_addr = devm_platform_ioremap_resource(pdev, 0 );
if (IS_ERR(gpio->base_addr))
return PTR_ERR(gpio->base_addr);
gpio->irq = platform_get_irq(pdev, 0 );
if (gpio->irq < 0 )
return gpio->irq;
/* configure the gpio chip */
chip = &gpio->chip;
chip->label = gpio->p_data->label;
chip->owner = THIS_MODULE;
chip->parent = &pdev->dev;
chip->get = zynq_gpio_get_value;
chip->set = zynq_gpio_set_value;
chip->request = zynq_gpio_request;
chip->free = zynq_gpio_free;
chip->direction_input = zynq_gpio_dir_in;
chip->direction_output = zynq_gpio_dir_out;
chip->get_direction = zynq_gpio_get_direction;
chip->base = of_alias_get_id(pdev->dev.of_node, "gpio" );
chip->ngpio = gpio->p_data->ngpio;
/* Retrieve GPIO clock */
gpio->clk = devm_clk_get_enabled(&pdev->dev, NULL);
if (IS_ERR(gpio->clk))
return dev_err_probe(&pdev->dev, PTR_ERR(gpio->clk), "input clock not found.\n" );
spin_lock_init(&gpio->dirlock);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
ret = pm_runtime_resume_and_get(&pdev->dev);
if (ret < 0 )
goto err_pm_dis;
/* disable interrupts for all banks */
for (bank_num = 0 ; bank_num < gpio->p_data->max_bank; bank_num++) {
writel_relaxed(ZYNQ_GPIO_IXR_DISABLE_ALL, gpio->base_addr +
ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
bank_num = bank_num + VERSAL_UNUSED_BANKS;
}
/* Set up the GPIO irqchip */
girq = &chip->irq;
gpio_irq_chip_set_chip(girq, &zynq_gpio_edge_irqchip);
girq->parent_handler = zynq_gpio_irqhandler;
girq->num_parents = 1 ;
girq->parents = devm_kcalloc(&pdev->dev, 1 ,
sizeof (*girq->parents),
GFP_KERNEL);
if (!girq->parents) {
ret = -ENOMEM;
goto err_pm_put;
}
girq->parents[0 ] = gpio->irq;
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_level_irq;
/* report a bug if gpio chip registration fails */
ret = gpiochip_add_data(chip, gpio);
if (ret) {
dev_err(&pdev->dev, "Failed to add gpio chip\n" );
goto err_pm_put;
}
irq_set_status_flags(gpio->irq, IRQ_DISABLE_UNLAZY);
device_init_wakeup(&pdev->dev, 1 );
pm_runtime_put(&pdev->dev);
return 0 ;
err_pm_put:
pm_runtime_put(&pdev->dev);
err_pm_dis:
pm_runtime_disable(&pdev->dev);
return ret;
}
/**
* zynq_gpio_remove - Driver removal function
* @ pdev : platform device instance
*
* Return : 0 always
*/
static void zynq_gpio_remove(struct platform_device *pdev)
{
struct zynq_gpio *gpio = platform_get_drvdata(pdev);
int ret;
ret = pm_runtime_get_sync(&pdev->dev);
if (ret < 0 )
dev_warn(&pdev->dev, "pm_runtime_get_sync() Failed\n" );
device_init_wakeup(&pdev->dev, 0 );
gpiochip_remove(&gpio->chip);
device_set_wakeup_capable(&pdev->dev, 0 );
pm_runtime_disable(&pdev->dev);
}
static struct platform_driver zynq_gpio_driver = {
.driver = {
.name = DRIVER_NAME,
.pm = &zynq_gpio_dev_pm_ops,
.of_match_table = zynq_gpio_of_match,
},
.probe = zynq_gpio_probe,
.remove = zynq_gpio_remove,
};
module_platform_driver(zynq_gpio_driver);
MODULE_AUTHOR("Xilinx Inc." );
MODULE_DESCRIPTION("Zynq GPIO driver" );
MODULE_LICENSE("GPL" );
Messung V0.5 in Prozent C=95 H=96 G=95
¤ Dauer der Verarbeitung: 0.16 Sekunden
(vorverarbeitet am 2026-09-28)
¤
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