linux/drivers/gpio/gpio-xilinx.c
Linus Torvalds 37644cac6e gpio: updates for v6.0-rc1
- remove gpio-vr41xx driver as the only platform using it got dropped too
 - add support for suspend/resume to gpio-davinci
 - improvements to the GPIO character device code
 - add support for disabling bias for in-kernel users (up until now
   only user-space could set it)
 - drop unused devm_gpio_free()
 - fix a refcount issue in gpiolib OF
 - use device match helpers where applicable
 - add support for a new model to gpio-rockchip
 - non-functional improvements in gpio-adp5588
 - improve and simplify teardown in gpio-twl4030 and gpio-ucb1400
 - modernize the gpio-74xx-mmio and gpio-adnp drivers
 - coding style improvements in gpio-xilinx, gpio-104-idi-48
 - support new model (pca9571) in gpio-pca9570
 - convert the DT bindings to YAML for gpio-mvebu and update the document
 - don't return error codes from remove() in gpio-brcmstb
 - add a library for the intel 8255 PPI interface and use it in drivers
 - reduce using magic numbers and improve code readability in several drivers
 - convert DT bindings to YAML for gpio-tpic2810
 - add new models to DT bindings for gpio-frl-imx
 - Kconfig improvements
 - other minor tweaks and improvements
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Merge tag 'gpio-updates-for-v6.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux

Pull gpio updates from Bartosz Golaszewski:
 "Here are the updates for this merge window from the GPIO subsystem.

  We have more lines removed than added thanks to dropping of a driver
  for a platform that's no longer supported. Otherwise the changes are
  pretty straightforward: support for some new models, various
  improvements to existing drivers, some tweaks to the core library code
  and DT bindings updates.

  Summary:

   - remove gpio-vr41xx driver as the only platform using it got dropped
     too

   - add support for suspend/resume to gpio-davinci

   - improvements to the GPIO character device code

   - add support for disabling bias for in-kernel users (up until now
     only user-space could set it)

   - drop unused devm_gpio_free()

   - fix a refcount issue in gpiolib OF

   - use device match helpers where applicable

   - add support for a new model to gpio-rockchip

   - non-functional improvements in gpio-adp5588

   - improve and simplify teardown in gpio-twl4030 and gpio-ucb1400

   - modernize the gpio-74xx-mmio and gpio-adnp drivers

   - coding style improvements in gpio-xilinx, gpio-104-idi-48

   - support new model (pca9571) in gpio-pca9570

   - convert the DT bindings to YAML for gpio-mvebu and update the
     document

   - don't return error codes from remove() in gpio-brcmstb

   - add a library for the intel 8255 PPI interface and use it in
     drivers

   - reduce using magic numbers and improve code readability in several
     drivers

   - convert DT bindings to YAML for gpio-tpic2810

   - add new models to DT bindings for gpio-frl-imx

   - Kconfig improvements

   - other minor tweaks and improvements"

* tag 'gpio-updates-for-v6.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux: (52 commits)
  dt-bindings: gpio: fsl-imx-gpio: Add i.MXRT compatibles
  gpio: 74xx-mmio: Use bits instead of plain numbers for flags
  gpio: xilinx: add missing blank line after declarations
  MAINTAINERS: Update Intel 8255 GPIO driver file list
  gpio: gpio-mm: Implement and utilize register structures
  gpio: 104-idi-48: Implement and utilize register structures
  gpio: 104-dio-48e: Implement and utilize register structures
  gpio: i8255: Introduce the Intel 8255 interface library module
  gpio: 104-idio-16: Implement and utilize register structures
  gpio: ws16c48: Implement and utilize register structures
  gpio: remove VR41XX related gpio driver
  dt-bindings: gpio: add pull-disable flag
  gpiolib: acpi: support bias pull disable
  gpiolib: of: support bias pull disable
  gpiolib: add support for bias pull disable
  gpio: 74xx-mmio: use bits.h macros for all masks
  gpio: 74xx-mmio: Check MMIO_74XX_DIR_IN flag in mmio_74xx_dir_in()
  gpio: 74xx-mmio: Make use of device properties
  gpiolib: cdev: compile out HTE unless CONFIG_HTE selected
  gpiolib: cdev: consolidate edge detector configuration flags
  ...
2022-08-04 18:34:05 -07:00

746 lines
20 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Xilinx gpio driver for xps/axi_gpio IP.
*
* Copyright 2008 - 2013 Xilinx, Inc.
*/
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/errno.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
/* Register Offset Definitions */
#define XGPIO_DATA_OFFSET (0x0) /* Data register */
#define XGPIO_TRI_OFFSET (0x4) /* I/O direction register */
#define XGPIO_CHANNEL0_OFFSET 0x0
#define XGPIO_CHANNEL1_OFFSET 0x8
#define XGPIO_GIER_OFFSET 0x11c /* Global Interrupt Enable */
#define XGPIO_GIER_IE BIT(31)
#define XGPIO_IPISR_OFFSET 0x120 /* IP Interrupt Status */
#define XGPIO_IPIER_OFFSET 0x128 /* IP Interrupt Enable */
/* Read/Write access to the GPIO registers */
#if defined(CONFIG_ARCH_ZYNQ) || defined(CONFIG_X86)
# define xgpio_readreg(offset) readl(offset)
# define xgpio_writereg(offset, val) writel(val, offset)
#else
# define xgpio_readreg(offset) __raw_readl(offset)
# define xgpio_writereg(offset, val) __raw_writel(val, offset)
#endif
/**
* struct xgpio_instance - Stores information about GPIO device
* @gc: GPIO chip
* @regs: register block
* @hw_map: GPIO pin mapping on hardware side
* @sw_map: GPIO pin mapping on software side
* @state: GPIO write state shadow register
* @last_irq_read: GPIO read state register from last interrupt
* @dir: GPIO direction shadow register
* @gpio_lock: Lock used for synchronization
* @irq: IRQ used by GPIO device
* @irqchip: IRQ chip
* @enable: GPIO IRQ enable/disable bitfield
* @rising_edge: GPIO IRQ rising edge enable/disable bitfield
* @falling_edge: GPIO IRQ falling edge enable/disable bitfield
* @clk: clock resource for this driver
*/
struct xgpio_instance {
struct gpio_chip gc;
void __iomem *regs;
DECLARE_BITMAP(hw_map, 64);
DECLARE_BITMAP(sw_map, 64);
DECLARE_BITMAP(state, 64);
DECLARE_BITMAP(last_irq_read, 64);
DECLARE_BITMAP(dir, 64);
spinlock_t gpio_lock; /* For serializing operations */
int irq;
struct irq_chip irqchip;
DECLARE_BITMAP(enable, 64);
DECLARE_BITMAP(rising_edge, 64);
DECLARE_BITMAP(falling_edge, 64);
struct clk *clk;
};
static inline int xgpio_from_bit(struct xgpio_instance *chip, int bit)
{
return bitmap_bitremap(bit, chip->hw_map, chip->sw_map, 64);
}
static inline int xgpio_to_bit(struct xgpio_instance *chip, int gpio)
{
return bitmap_bitremap(gpio, chip->sw_map, chip->hw_map, 64);
}
static inline u32 xgpio_get_value32(const unsigned long *map, int bit)
{
const size_t index = BIT_WORD(bit);
const unsigned long offset = (bit % BITS_PER_LONG) & BIT(5);
return (map[index] >> offset) & 0xFFFFFFFFul;
}
static inline void xgpio_set_value32(unsigned long *map, int bit, u32 v)
{
const size_t index = BIT_WORD(bit);
const unsigned long offset = (bit % BITS_PER_LONG) & BIT(5);
map[index] &= ~(0xFFFFFFFFul << offset);
map[index] |= (unsigned long)v << offset;
}
static inline int xgpio_regoffset(struct xgpio_instance *chip, int ch)
{
switch (ch) {
case 0:
return XGPIO_CHANNEL0_OFFSET;
case 1:
return XGPIO_CHANNEL1_OFFSET;
default:
return -EINVAL;
}
}
static void xgpio_read_ch(struct xgpio_instance *chip, int reg, int bit, unsigned long *a)
{
void __iomem *addr = chip->regs + reg + xgpio_regoffset(chip, bit / 32);
xgpio_set_value32(a, bit, xgpio_readreg(addr));
}
static void xgpio_write_ch(struct xgpio_instance *chip, int reg, int bit, unsigned long *a)
{
void __iomem *addr = chip->regs + reg + xgpio_regoffset(chip, bit / 32);
xgpio_writereg(addr, xgpio_get_value32(a, bit));
}
static void xgpio_read_ch_all(struct xgpio_instance *chip, int reg, unsigned long *a)
{
int bit, lastbit = xgpio_to_bit(chip, chip->gc.ngpio - 1);
for (bit = 0; bit <= lastbit ; bit += 32)
xgpio_read_ch(chip, reg, bit, a);
}
static void xgpio_write_ch_all(struct xgpio_instance *chip, int reg, unsigned long *a)
{
int bit, lastbit = xgpio_to_bit(chip, chip->gc.ngpio - 1);
for (bit = 0; bit <= lastbit ; bit += 32)
xgpio_write_ch(chip, reg, bit, a);
}
/**
* xgpio_get - Read the specified signal of the GPIO device.
* @gc: Pointer to gpio_chip device structure.
* @gpio: GPIO signal number.
*
* This function reads the specified signal of the GPIO device.
*
* Return:
* 0 if direction of GPIO signals is set as input otherwise it
* returns negative error value.
*/
static int xgpio_get(struct gpio_chip *gc, unsigned int gpio)
{
struct xgpio_instance *chip = gpiochip_get_data(gc);
int bit = xgpio_to_bit(chip, gpio);
DECLARE_BITMAP(state, 64);
xgpio_read_ch(chip, XGPIO_DATA_OFFSET, bit, state);
return test_bit(bit, state);
}
/**
* xgpio_set - Write the specified signal of the GPIO device.
* @gc: Pointer to gpio_chip device structure.
* @gpio: GPIO signal number.
* @val: Value to be written to specified signal.
*
* This function writes the specified value in to the specified signal of the
* GPIO device.
*/
static void xgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
unsigned long flags;
struct xgpio_instance *chip = gpiochip_get_data(gc);
int bit = xgpio_to_bit(chip, gpio);
spin_lock_irqsave(&chip->gpio_lock, flags);
/* Write to GPIO signal and set its direction to output */
__assign_bit(bit, chip->state, val);
xgpio_write_ch(chip, XGPIO_DATA_OFFSET, bit, chip->state);
spin_unlock_irqrestore(&chip->gpio_lock, flags);
}
/**
* xgpio_set_multiple - Write the specified signals of the GPIO device.
* @gc: Pointer to gpio_chip device structure.
* @mask: Mask of the GPIOS to modify.
* @bits: Value to be wrote on each GPIO
*
* This function writes the specified values into the specified signals of the
* GPIO devices.
*/
static void xgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask,
unsigned long *bits)
{
DECLARE_BITMAP(hw_mask, 64);
DECLARE_BITMAP(hw_bits, 64);
DECLARE_BITMAP(state, 64);
unsigned long flags;
struct xgpio_instance *chip = gpiochip_get_data(gc);
bitmap_remap(hw_mask, mask, chip->sw_map, chip->hw_map, 64);
bitmap_remap(hw_bits, bits, chip->sw_map, chip->hw_map, 64);
spin_lock_irqsave(&chip->gpio_lock, flags);
bitmap_replace(state, chip->state, hw_bits, hw_mask, 64);
xgpio_write_ch_all(chip, XGPIO_DATA_OFFSET, state);
bitmap_copy(chip->state, state, 64);
spin_unlock_irqrestore(&chip->gpio_lock, flags);
}
/**
* xgpio_dir_in - Set the direction of the specified GPIO signal as input.
* @gc: Pointer to gpio_chip device structure.
* @gpio: GPIO signal number.
*
* Return:
* 0 - if direction of GPIO signals is set as input
* otherwise it returns negative error value.
*/
static int xgpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
unsigned long flags;
struct xgpio_instance *chip = gpiochip_get_data(gc);
int bit = xgpio_to_bit(chip, gpio);
spin_lock_irqsave(&chip->gpio_lock, flags);
/* Set the GPIO bit in shadow register and set direction as input */
__set_bit(bit, chip->dir);
xgpio_write_ch(chip, XGPIO_TRI_OFFSET, bit, chip->dir);
spin_unlock_irqrestore(&chip->gpio_lock, flags);
return 0;
}
/**
* xgpio_dir_out - Set the direction of the specified GPIO signal as output.
* @gc: Pointer to gpio_chip device structure.
* @gpio: GPIO signal number.
* @val: Value to be written to specified signal.
*
* This function sets the direction of specified GPIO signal as output.
*
* Return:
* If all GPIO signals of GPIO chip is configured as input then it returns
* error otherwise it returns 0.
*/
static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
unsigned long flags;
struct xgpio_instance *chip = gpiochip_get_data(gc);
int bit = xgpio_to_bit(chip, gpio);
spin_lock_irqsave(&chip->gpio_lock, flags);
/* Write state of GPIO signal */
__assign_bit(bit, chip->state, val);
xgpio_write_ch(chip, XGPIO_DATA_OFFSET, bit, chip->state);
/* Clear the GPIO bit in shadow register and set direction as output */
__clear_bit(bit, chip->dir);
xgpio_write_ch(chip, XGPIO_TRI_OFFSET, bit, chip->dir);
spin_unlock_irqrestore(&chip->gpio_lock, flags);
return 0;
}
/**
* xgpio_save_regs - Set initial values of GPIO pins
* @chip: Pointer to GPIO instance
*/
static void xgpio_save_regs(struct xgpio_instance *chip)
{
xgpio_write_ch_all(chip, XGPIO_DATA_OFFSET, chip->state);
xgpio_write_ch_all(chip, XGPIO_TRI_OFFSET, chip->dir);
}
static int xgpio_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 xgpio_free(struct gpio_chip *chip, unsigned int offset)
{
pm_runtime_put(chip->parent);
}
static int __maybe_unused xgpio_suspend(struct device *dev)
{
struct xgpio_instance *gpio = dev_get_drvdata(dev);
struct irq_data *data = irq_get_irq_data(gpio->irq);
if (!data) {
dev_dbg(dev, "IRQ not connected\n");
return pm_runtime_force_suspend(dev);
}
if (!irqd_is_wakeup_set(data))
return pm_runtime_force_suspend(dev);
return 0;
}
/**
* xgpio_remove - Remove method for the GPIO device.
* @pdev: pointer to the platform device
*
* This function remove gpiochips and frees all the allocated resources.
*
* Return: 0 always
*/
static int xgpio_remove(struct platform_device *pdev)
{
struct xgpio_instance *gpio = platform_get_drvdata(pdev);
pm_runtime_get_sync(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
clk_disable_unprepare(gpio->clk);
return 0;
}
/**
* xgpio_irq_ack - Acknowledge a child GPIO interrupt.
* @irq_data: per IRQ and chip data passed down to chip functions
* This currently does nothing, but irq_ack is unconditionally called by
* handle_edge_irq and therefore must be defined.
*/
static void xgpio_irq_ack(struct irq_data *irq_data)
{
}
static int __maybe_unused xgpio_resume(struct device *dev)
{
struct xgpio_instance *gpio = dev_get_drvdata(dev);
struct irq_data *data = irq_get_irq_data(gpio->irq);
if (!data) {
dev_dbg(dev, "IRQ not connected\n");
return pm_runtime_force_resume(dev);
}
if (!irqd_is_wakeup_set(data))
return pm_runtime_force_resume(dev);
return 0;
}
static int __maybe_unused xgpio_runtime_suspend(struct device *dev)
{
struct xgpio_instance *gpio = dev_get_drvdata(dev);
clk_disable(gpio->clk);
return 0;
}
static int __maybe_unused xgpio_runtime_resume(struct device *dev)
{
struct xgpio_instance *gpio = dev_get_drvdata(dev);
return clk_enable(gpio->clk);
}
static const struct dev_pm_ops xgpio_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(xgpio_suspend, xgpio_resume)
SET_RUNTIME_PM_OPS(xgpio_runtime_suspend,
xgpio_runtime_resume, NULL)
};
/**
* xgpio_irq_mask - Write the specified signal of the GPIO device.
* @irq_data: per IRQ and chip data passed down to chip functions
*/
static void xgpio_irq_mask(struct irq_data *irq_data)
{
unsigned long flags;
struct xgpio_instance *chip = irq_data_get_irq_chip_data(irq_data);
int irq_offset = irqd_to_hwirq(irq_data);
int bit = xgpio_to_bit(chip, irq_offset);
u32 mask = BIT(bit / 32), temp;
spin_lock_irqsave(&chip->gpio_lock, flags);
__clear_bit(bit, chip->enable);
if (xgpio_get_value32(chip->enable, bit) == 0) {
/* Disable per channel interrupt */
temp = xgpio_readreg(chip->regs + XGPIO_IPIER_OFFSET);
temp &= ~mask;
xgpio_writereg(chip->regs + XGPIO_IPIER_OFFSET, temp);
}
spin_unlock_irqrestore(&chip->gpio_lock, flags);
}
/**
* xgpio_irq_unmask - Write the specified signal of the GPIO device.
* @irq_data: per IRQ and chip data passed down to chip functions
*/
static void xgpio_irq_unmask(struct irq_data *irq_data)
{
unsigned long flags;
struct xgpio_instance *chip = irq_data_get_irq_chip_data(irq_data);
int irq_offset = irqd_to_hwirq(irq_data);
int bit = xgpio_to_bit(chip, irq_offset);
u32 old_enable = xgpio_get_value32(chip->enable, bit);
u32 mask = BIT(bit / 32), val;
spin_lock_irqsave(&chip->gpio_lock, flags);
__set_bit(bit, chip->enable);
if (old_enable == 0) {
/* Clear any existing per-channel interrupts */
val = xgpio_readreg(chip->regs + XGPIO_IPISR_OFFSET);
val &= mask;
xgpio_writereg(chip->regs + XGPIO_IPISR_OFFSET, val);
/* Update GPIO IRQ read data before enabling interrupt*/
xgpio_read_ch(chip, XGPIO_DATA_OFFSET, bit, chip->last_irq_read);
/* Enable per channel interrupt */
val = xgpio_readreg(chip->regs + XGPIO_IPIER_OFFSET);
val |= mask;
xgpio_writereg(chip->regs + XGPIO_IPIER_OFFSET, val);
}
spin_unlock_irqrestore(&chip->gpio_lock, flags);
}
/**
* xgpio_set_irq_type - Write the specified signal of the GPIO device.
* @irq_data: Per IRQ and chip data passed down to chip functions
* @type: Interrupt type that is to be set for the gpio pin
*
* Return:
* 0 if interrupt type is supported otherwise -EINVAL
*/
static int xgpio_set_irq_type(struct irq_data *irq_data, unsigned int type)
{
struct xgpio_instance *chip = irq_data_get_irq_chip_data(irq_data);
int irq_offset = irqd_to_hwirq(irq_data);
int bit = xgpio_to_bit(chip, irq_offset);
/*
* The Xilinx GPIO hardware provides a single interrupt status
* indication for any state change in a given GPIO channel (bank).
* Therefore, only rising edge or falling edge triggers are
* supported.
*/
switch (type & IRQ_TYPE_SENSE_MASK) {
case IRQ_TYPE_EDGE_BOTH:
__set_bit(bit, chip->rising_edge);
__set_bit(bit, chip->falling_edge);
break;
case IRQ_TYPE_EDGE_RISING:
__set_bit(bit, chip->rising_edge);
__clear_bit(bit, chip->falling_edge);
break;
case IRQ_TYPE_EDGE_FALLING:
__clear_bit(bit, chip->rising_edge);
__set_bit(bit, chip->falling_edge);
break;
default:
return -EINVAL;
}
irq_set_handler_locked(irq_data, handle_edge_irq);
return 0;
}
/**
* xgpio_irqhandler - Gpio interrupt service routine
* @desc: Pointer to interrupt description
*/
static void xgpio_irqhandler(struct irq_desc *desc)
{
struct xgpio_instance *chip = irq_desc_get_handler_data(desc);
struct gpio_chip *gc = &chip->gc;
struct irq_chip *irqchip = irq_desc_get_chip(desc);
DECLARE_BITMAP(rising, 64);
DECLARE_BITMAP(falling, 64);
DECLARE_BITMAP(all, 64);
int irq_offset;
u32 status;
u32 bit;
status = xgpio_readreg(chip->regs + XGPIO_IPISR_OFFSET);
xgpio_writereg(chip->regs + XGPIO_IPISR_OFFSET, status);
chained_irq_enter(irqchip, desc);
spin_lock(&chip->gpio_lock);
xgpio_read_ch_all(chip, XGPIO_DATA_OFFSET, all);
bitmap_complement(rising, chip->last_irq_read, 64);
bitmap_and(rising, rising, all, 64);
bitmap_and(rising, rising, chip->enable, 64);
bitmap_and(rising, rising, chip->rising_edge, 64);
bitmap_complement(falling, all, 64);
bitmap_and(falling, falling, chip->last_irq_read, 64);
bitmap_and(falling, falling, chip->enable, 64);
bitmap_and(falling, falling, chip->falling_edge, 64);
bitmap_copy(chip->last_irq_read, all, 64);
bitmap_or(all, rising, falling, 64);
spin_unlock(&chip->gpio_lock);
dev_dbg(gc->parent, "IRQ rising %*pb falling %*pb\n", 64, rising, 64, falling);
for_each_set_bit(bit, all, 64) {
irq_offset = xgpio_from_bit(chip, bit);
generic_handle_domain_irq(gc->irq.domain, irq_offset);
}
chained_irq_exit(irqchip, desc);
}
/**
* xgpio_probe - Probe method for the GPIO device.
* @pdev: pointer to the platform device
*
* Return:
* It returns 0, if the driver is bound to the GPIO device, or
* a negative value if there is an error.
*/
static int xgpio_probe(struct platform_device *pdev)
{
struct xgpio_instance *chip;
int status = 0;
struct device_node *np = pdev->dev.of_node;
u32 is_dual = 0;
u32 cells = 2;
u32 width[2];
u32 state[2];
u32 dir[2];
struct gpio_irq_chip *girq;
u32 temp;
chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
platform_set_drvdata(pdev, chip);
/* First, check if the device is dual-channel */
of_property_read_u32(np, "xlnx,is-dual", &is_dual);
/* Setup defaults */
memset32(width, 0, ARRAY_SIZE(width));
memset32(state, 0, ARRAY_SIZE(state));
memset32(dir, 0xFFFFFFFF, ARRAY_SIZE(dir));
/* Update GPIO state shadow register with default value */
of_property_read_u32(np, "xlnx,dout-default", &state[0]);
of_property_read_u32(np, "xlnx,dout-default-2", &state[1]);
bitmap_from_arr32(chip->state, state, 64);
/* Update GPIO direction shadow register with default value */
of_property_read_u32(np, "xlnx,tri-default", &dir[0]);
of_property_read_u32(np, "xlnx,tri-default-2", &dir[1]);
bitmap_from_arr32(chip->dir, dir, 64);
/* Update cells with gpio-cells value */
if (of_property_read_u32(np, "#gpio-cells", &cells))
dev_dbg(&pdev->dev, "Missing gpio-cells property\n");
if (cells != 2) {
dev_err(&pdev->dev, "#gpio-cells mismatch\n");
return -EINVAL;
}
/*
* Check device node and parent device node for device width
* and assume default width of 32
*/
if (of_property_read_u32(np, "xlnx,gpio-width", &width[0]))
width[0] = 32;
if (width[0] > 32)
return -EINVAL;
if (is_dual && of_property_read_u32(np, "xlnx,gpio2-width", &width[1]))
width[1] = 32;
if (width[1] > 32)
return -EINVAL;
/* Setup software pin mapping */
bitmap_set(chip->sw_map, 0, width[0] + width[1]);
/* Setup hardware pin mapping */
bitmap_set(chip->hw_map, 0, width[0]);
bitmap_set(chip->hw_map, 32, width[1]);
spin_lock_init(&chip->gpio_lock);
chip->gc.base = -1;
chip->gc.ngpio = bitmap_weight(chip->hw_map, 64);
chip->gc.parent = &pdev->dev;
chip->gc.direction_input = xgpio_dir_in;
chip->gc.direction_output = xgpio_dir_out;
chip->gc.of_gpio_n_cells = cells;
chip->gc.get = xgpio_get;
chip->gc.set = xgpio_set;
chip->gc.request = xgpio_request;
chip->gc.free = xgpio_free;
chip->gc.set_multiple = xgpio_set_multiple;
chip->gc.label = dev_name(&pdev->dev);
chip->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(chip->regs)) {
dev_err(&pdev->dev, "failed to ioremap memory resource\n");
return PTR_ERR(chip->regs);
}
chip->clk = devm_clk_get_optional(&pdev->dev, NULL);
if (IS_ERR(chip->clk))
return dev_err_probe(&pdev->dev, PTR_ERR(chip->clk), "input clock not found.\n");
status = clk_prepare_enable(chip->clk);
if (status < 0) {
dev_err(&pdev->dev, "Failed to prepare clk\n");
return status;
}
pm_runtime_get_noresume(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
xgpio_save_regs(chip);
chip->irq = platform_get_irq_optional(pdev, 0);
if (chip->irq <= 0)
goto skip_irq;
chip->irqchip.name = "gpio-xilinx";
chip->irqchip.irq_ack = xgpio_irq_ack;
chip->irqchip.irq_mask = xgpio_irq_mask;
chip->irqchip.irq_unmask = xgpio_irq_unmask;
chip->irqchip.irq_set_type = xgpio_set_irq_type;
/* Disable per-channel interrupts */
xgpio_writereg(chip->regs + XGPIO_IPIER_OFFSET, 0);
/* Clear any existing per-channel interrupts */
temp = xgpio_readreg(chip->regs + XGPIO_IPISR_OFFSET);
xgpio_writereg(chip->regs + XGPIO_IPISR_OFFSET, temp);
/* Enable global interrupts */
xgpio_writereg(chip->regs + XGPIO_GIER_OFFSET, XGPIO_GIER_IE);
girq = &chip->gc.irq;
girq->chip = &chip->irqchip;
girq->parent_handler = xgpio_irqhandler;
girq->num_parents = 1;
girq->parents = devm_kcalloc(&pdev->dev, 1,
sizeof(*girq->parents),
GFP_KERNEL);
if (!girq->parents) {
status = -ENOMEM;
goto err_pm_put;
}
girq->parents[0] = chip->irq;
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_bad_irq;
skip_irq:
status = devm_gpiochip_add_data(&pdev->dev, &chip->gc, chip);
if (status) {
dev_err(&pdev->dev, "failed to add GPIO chip\n");
goto err_pm_put;
}
pm_runtime_put(&pdev->dev);
return 0;
err_pm_put:
pm_runtime_disable(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
clk_disable_unprepare(chip->clk);
return status;
}
static const struct of_device_id xgpio_of_match[] = {
{ .compatible = "xlnx,xps-gpio-1.00.a", },
{ /* end of list */ },
};
MODULE_DEVICE_TABLE(of, xgpio_of_match);
static struct platform_driver xgpio_plat_driver = {
.probe = xgpio_probe,
.remove = xgpio_remove,
.driver = {
.name = "gpio-xilinx",
.of_match_table = xgpio_of_match,
.pm = &xgpio_dev_pm_ops,
},
};
static int __init xgpio_init(void)
{
return platform_driver_register(&xgpio_plat_driver);
}
subsys_initcall(xgpio_init);
static void __exit xgpio_exit(void)
{
platform_driver_unregister(&xgpio_plat_driver);
}
module_exit(xgpio_exit);
MODULE_AUTHOR("Xilinx, Inc.");
MODULE_DESCRIPTION("Xilinx GPIO driver");
MODULE_LICENSE("GPL");