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path: root/drivers/pinctrl/pinctrl-ocelot.c
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Diffstat (limited to 'drivers/pinctrl/pinctrl-ocelot.c')
-rw-r--r--drivers/pinctrl/pinctrl-ocelot.c104
1 files changed, 101 insertions, 3 deletions
diff --git a/drivers/pinctrl/pinctrl-ocelot.c b/drivers/pinctrl/pinctrl-ocelot.c
index 15bb1cb8729b..f9fc2b3a8731 100644
--- a/drivers/pinctrl/pinctrl-ocelot.c
+++ b/drivers/pinctrl/pinctrl-ocelot.c
@@ -11,6 +11,7 @@
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/of_device.h>
+#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
@@ -132,7 +133,7 @@ OCELOT_P(0, SG0, NONE, NONE);
OCELOT_P(1, SG0, NONE, NONE);
OCELOT_P(2, SG0, NONE, NONE);
OCELOT_P(3, SG0, NONE, NONE);
-OCELOT_P(4, IRQ0_IN, IRQ0_OUT, TWI);
+OCELOT_P(4, IRQ0_IN, IRQ0_OUT, TWI_SCL_M);
OCELOT_P(5, IRQ1_IN, IRQ1_OUT, PCI_WAKE);
OCELOT_P(6, UART, TWI_SCL_M, NONE);
OCELOT_P(7, UART, TWI_SCL_M, NONE);
@@ -427,11 +428,98 @@ static const struct gpio_chip ocelot_gpiolib_chip = {
.owner = THIS_MODULE,
};
+static void ocelot_irq_mask(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+ unsigned int gpio = irqd_to_hwirq(data);
+
+ regmap_update_bits(info->map, OCELOT_GPIO_INTR_ENA, BIT(gpio), 0);
+}
+
+static void ocelot_irq_unmask(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+ unsigned int gpio = irqd_to_hwirq(data);
+
+ regmap_update_bits(info->map, OCELOT_GPIO_INTR_ENA, BIT(gpio),
+ BIT(gpio));
+}
+
+static void ocelot_irq_ack(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+ unsigned int gpio = irqd_to_hwirq(data);
+
+ regmap_write_bits(info->map, OCELOT_GPIO_INTR, BIT(gpio), BIT(gpio));
+}
+
+static int ocelot_irq_set_type(struct irq_data *data, unsigned int type);
+
+static struct irq_chip ocelot_eoi_irqchip = {
+ .name = "gpio",
+ .irq_mask = ocelot_irq_mask,
+ .irq_eoi = ocelot_irq_ack,
+ .irq_unmask = ocelot_irq_unmask,
+ .flags = IRQCHIP_EOI_THREADED | IRQCHIP_EOI_IF_HANDLED,
+ .irq_set_type = ocelot_irq_set_type,
+};
+
+static struct irq_chip ocelot_irqchip = {
+ .name = "gpio",
+ .irq_mask = ocelot_irq_mask,
+ .irq_ack = ocelot_irq_ack,
+ .irq_unmask = ocelot_irq_unmask,
+ .irq_set_type = ocelot_irq_set_type,
+};
+
+static int ocelot_irq_set_type(struct irq_data *data, unsigned int type)
+{
+ type &= IRQ_TYPE_SENSE_MASK;
+
+ if (!(type & (IRQ_TYPE_EDGE_BOTH | IRQ_TYPE_LEVEL_HIGH)))
+ return -EINVAL;
+
+ if (type & IRQ_TYPE_LEVEL_HIGH)
+ irq_set_chip_handler_name_locked(data, &ocelot_eoi_irqchip,
+ handle_fasteoi_irq, NULL);
+ if (type & IRQ_TYPE_EDGE_BOTH)
+ irq_set_chip_handler_name_locked(data, &ocelot_irqchip,
+ handle_edge_irq, NULL);
+
+ return 0;
+}
+
+static void ocelot_irq_handler(struct irq_desc *desc)
+{
+ struct irq_chip *parent_chip = irq_desc_get_chip(desc);
+ struct gpio_chip *chip = irq_desc_get_handler_data(desc);
+ struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+ unsigned int reg = 0, irq;
+ unsigned long irqs;
+
+ regmap_read(info->map, OCELOT_GPIO_INTR_IDENT, &reg);
+ if (!reg)
+ return;
+
+ chained_irq_enter(parent_chip, desc);
+
+ irqs = reg;
+
+ for_each_set_bit(irq, &irqs, OCELOT_PINS) {
+ generic_handle_irq(irq_linear_revmap(chip->irq.domain, irq));
+ }
+
+ chained_irq_exit(parent_chip, desc);
+}
+
static int ocelot_gpiochip_register(struct platform_device *pdev,
struct ocelot_pinctrl *info)
{
struct gpio_chip *gc;
- int ret;
+ int ret, irq;
info->gpio_chip = ocelot_gpiolib_chip;
@@ -446,7 +534,17 @@ static int ocelot_gpiochip_register(struct platform_device *pdev,
if (ret)
return ret;
- /* TODO: this can be used as an irqchip but no board is using that */
+ irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
+ if (irq <= 0)
+ return irq;
+
+ ret = gpiochip_irqchip_add(gc, &ocelot_irqchip, 0, handle_edge_irq,
+ IRQ_TYPE_NONE);
+ if (ret)
+ return ret;
+
+ gpiochip_set_chained_irqchip(gc, &ocelot_irqchip, irq,
+ ocelot_irq_handler);
return 0;
}