#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_CHANNEL_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)
* @gc: GPIO chip
* @regs: register block
* @gpio_width: GPIO width for every channel
- * @gpio_state: GPIO state shadow register
+ * @gpio_state: GPIO write state shadow register
+ * @gpio_last_irq_read: GPIO read state register from last interrupt
* @gpio_dir: GPIO direction shadow register
* @gpio_lock: Lock used for synchronization
+ * @irq: IRQ used by GPIO device
+ * @irqchip: IRQ chip
+ * @irq_enable: GPIO IRQ enable/disable bitfield
+ * @irq_rising_edge: GPIO IRQ rising edge enable/disable bitfield
+ * @irq_falling_edge: GPIO IRQ falling edge enable/disable bitfield
* @clk: clock resource for this driver
*/
struct xgpio_instance {
void __iomem *regs;
unsigned int gpio_width[2];
u32 gpio_state[2];
+ u32 gpio_last_irq_read[2];
u32 gpio_dir[2];
- spinlock_t gpio_lock[2];
+ spinlock_t gpio_lock; /* For serializing operations */
+ int irq;
+ struct irq_chip irqchip;
+ u32 irq_enable[2];
+ u32 irq_rising_edge[2];
+ u32 irq_falling_edge[2];
struct clk *clk;
};
int index = xgpio_index(chip, gpio);
int offset = xgpio_offset(chip, gpio);
- spin_lock_irqsave(&chip->gpio_lock[index], flags);
+ spin_lock_irqsave(&chip->gpio_lock, flags);
/* Write to GPIO signal and set its direction to output */
if (val)
xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET +
xgpio_regoffset(chip, gpio), chip->gpio_state[index]);
- spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
+ spin_unlock_irqrestore(&chip->gpio_lock, flags);
}
/**
int index = xgpio_index(chip, 0);
int offset, i;
- spin_lock_irqsave(&chip->gpio_lock[index], flags);
+ spin_lock_irqsave(&chip->gpio_lock, flags);
/* Write to GPIO signals */
for (i = 0; i < gc->ngpio; i++) {
xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET +
index * XGPIO_CHANNEL_OFFSET,
chip->gpio_state[index]);
- spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
+ spin_unlock_irqrestore(&chip->gpio_lock, flags);
index = xgpio_index(chip, i);
- spin_lock_irqsave(&chip->gpio_lock[index], flags);
+ spin_lock_irqsave(&chip->gpio_lock, flags);
}
if (__test_and_clear_bit(i, mask)) {
offset = xgpio_offset(chip, i);
xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET +
index * XGPIO_CHANNEL_OFFSET, chip->gpio_state[index]);
- spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
+ spin_unlock_irqrestore(&chip->gpio_lock, flags);
}
/**
int index = xgpio_index(chip, gpio);
int offset = xgpio_offset(chip, gpio);
- spin_lock_irqsave(&chip->gpio_lock[index], flags);
+ spin_lock_irqsave(&chip->gpio_lock, flags);
/* Set the GPIO bit in shadow register and set direction as input */
chip->gpio_dir[index] |= BIT(offset);
xgpio_writereg(chip->regs + XGPIO_TRI_OFFSET +
xgpio_regoffset(chip, gpio), chip->gpio_dir[index]);
- spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
+ spin_unlock_irqrestore(&chip->gpio_lock, flags);
return 0;
}
int index = xgpio_index(chip, gpio);
int offset = xgpio_offset(chip, gpio);
- spin_lock_irqsave(&chip->gpio_lock[index], flags);
+ spin_lock_irqsave(&chip->gpio_lock, flags);
/* Write state of GPIO signal */
if (val)
xgpio_writereg(chip->regs + XGPIO_TRI_OFFSET +
xgpio_regoffset(chip, gpio), chip->gpio_dir[index]);
- spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
+ spin_unlock_irqrestore(&chip->gpio_lock, flags);
return 0;
}
chip->gpio_dir[1]);
}
+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_err(dev, "irq_get_irq_data() failed\n");
+ return -EINVAL;
+ }
+
+ 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
{
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_err(dev, "irq_get_irq_data() failed\n");
+ return -EINVAL;
+ }
+
+ 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 platform_device *pdev = to_platform_device(dev);
+ struct xgpio_instance *gpio = platform_get_drvdata(pdev);
+
+ clk_disable(gpio->clk);
+
+ return 0;
+}
+
+static int __maybe_unused xgpio_runtime_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct xgpio_instance *gpio = platform_get_drvdata(pdev);
+
+ 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 index = xgpio_index(chip, irq_offset);
+ int offset = xgpio_offset(chip, irq_offset);
+
+ spin_lock_irqsave(&chip->gpio_lock, flags);
+
+ chip->irq_enable[index] &= ~BIT(offset);
+
+ if (!chip->irq_enable[index]) {
+ /* Disable per channel interrupt */
+ u32 temp = xgpio_readreg(chip->regs + XGPIO_IPIER_OFFSET);
+
+ temp &= ~BIT(index);
+ 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 index = xgpio_index(chip, irq_offset);
+ int offset = xgpio_offset(chip, irq_offset);
+ u32 old_enable = chip->irq_enable[index];
+
+ spin_lock_irqsave(&chip->gpio_lock, flags);
+
+ chip->irq_enable[index] |= BIT(offset);
+
+ if (!old_enable) {
+ /* Clear any existing per-channel interrupts */
+ u32 val = xgpio_readreg(chip->regs + XGPIO_IPISR_OFFSET) &
+ BIT(index);
+
+ if (val)
+ xgpio_writereg(chip->regs + XGPIO_IPISR_OFFSET, val);
+
+ /* Update GPIO IRQ read data before enabling interrupt*/
+ val = xgpio_readreg(chip->regs + XGPIO_DATA_OFFSET +
+ index * XGPIO_CHANNEL_OFFSET);
+ chip->gpio_last_irq_read[index] = val;
+
+ /* Enable per channel interrupt */
+ val = xgpio_readreg(chip->regs + XGPIO_IPIER_OFFSET);
+ val |= BIT(index);
+ 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 index = xgpio_index(chip, irq_offset);
+ int offset = xgpio_offset(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:
+ chip->irq_rising_edge[index] |= BIT(offset);
+ chip->irq_falling_edge[index] |= BIT(offset);
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ chip->irq_rising_edge[index] |= BIT(offset);
+ chip->irq_falling_edge[index] &= ~BIT(offset);
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ chip->irq_rising_edge[index] &= ~BIT(offset);
+ chip->irq_falling_edge[index] |= BIT(offset);
+ 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 irq_chip *irqchip = irq_desc_get_chip(desc);
+ u32 num_channels = chip->gpio_width[1] ? 2 : 1;
+ u32 offset = 0, index;
+ u32 status = xgpio_readreg(chip->regs + XGPIO_IPISR_OFFSET);
+
+ xgpio_writereg(chip->regs + XGPIO_IPISR_OFFSET, status);
+
+ chained_irq_enter(irqchip, desc);
+ for (index = 0; index < num_channels; index++) {
+ if ((status & BIT(index))) {
+ unsigned long rising_events, falling_events, all_events;
+ unsigned long flags;
+ u32 data, bit;
+ unsigned int irq;
+
+ spin_lock_irqsave(&chip->gpio_lock, flags);
+ data = xgpio_readreg(chip->regs + XGPIO_DATA_OFFSET +
+ index * XGPIO_CHANNEL_OFFSET);
+ rising_events = data &
+ ~chip->gpio_last_irq_read[index] &
+ chip->irq_enable[index] &
+ chip->irq_rising_edge[index];
+ falling_events = ~data &
+ chip->gpio_last_irq_read[index] &
+ chip->irq_enable[index] &
+ chip->irq_falling_edge[index];
+ dev_dbg(chip->gc.parent,
+ "IRQ chan %u rising 0x%lx falling 0x%lx\n",
+ index, rising_events, falling_events);
+ all_events = rising_events | falling_events;
+ chip->gpio_last_irq_read[index] = data;
+ spin_unlock_irqrestore(&chip->gpio_lock, flags);
+
+ for_each_set_bit(bit, &all_events, 32) {
+ irq = irq_find_mapping(chip->gc.irq.domain,
+ offset + bit);
+ generic_handle_irq(irq);
+ }
+ }
+ offset += chip->gpio_width[index];
+ }
+
+ chained_irq_exit(irqchip, desc);
+}
+
/**
* xgpio_of_probe - Probe method for the GPIO device.
* @pdev: pointer to the platform device
struct xgpio_instance *chip;
int status = 0;
struct device_node *np = pdev->dev.of_node;
- u32 is_dual;
+ u32 is_dual = 0;
+ u32 cells = 2;
+ struct gpio_irq_chip *girq;
+ u32 temp;
chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
if (of_property_read_u32(np, "xlnx,tri-default", &chip->gpio_dir[0]))
chip->gpio_dir[0] = 0xFFFFFFFF;
+ /* 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", &chip->gpio_width[0]))
chip->gpio_width[0] = 32;
- spin_lock_init(&chip->gpio_lock[0]);
+ if (chip->gpio_width[0] > 32)
+ return -EINVAL;
+
+ spin_lock_init(&chip->gpio_lock);
if (of_property_read_u32(np, "xlnx,is-dual", &is_dual))
is_dual = 0;
&chip->gpio_width[1]))
chip->gpio_width[1] = 32;
- spin_lock_init(&chip->gpio_lock[1]);
+ if (chip->gpio_width[1] > 32)
+ return -EINVAL;
}
chip->gc.base = -1;
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->clk = devm_clk_get_optional(&pdev->dev, NULL);
- if (IS_ERR(chip->clk)) {
- if (PTR_ERR(chip->clk) != -EPROBE_DEFER)
- dev_dbg(&pdev->dev, "Input clock not found\n");
- return PTR_ERR(chip->clk);
- }
+ 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");
- clk_disable_unprepare(chip->clk);
- return status;
+ 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[] = {
.driver = {
.name = "gpio-xilinx",
.of_match_table = xgpio_of_match,
+ .pm = &xgpio_dev_pm_ops,
},
};
projects / linux-2.6-microblaze.git / blobdiff