#include <linux/module.h>
#include <linux/slab.h>
#include <linux/gpio.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
#include "greybus.h"
struct gb_gpio_line {
struct gb_gpio_line *lines;
struct gpio_chip chip;
+ struct irq_chip irqc;
+ struct irq_chip *irqchip;
+ struct irq_domain *irqdomain;
+ unsigned int irq_base;
+ irq_flow_handler_t irq_handler;
+ unsigned int irq_default_type;
};
#define gpio_chip_to_gb_gpio_controller(chip) \
container_of(chip, struct gb_gpio_controller, chip)
+#define irq_data_to_gpio_chip(d) (d->domain->host_data)
/* Version of the Greybus GPIO protocol we support */
#define GB_GPIO_VERSION_MAJOR 0x00
#define GB_GPIO_TYPE_GET_VALUE 0x08
#define GB_GPIO_TYPE_SET_VALUE 0x09
#define GB_GPIO_TYPE_SET_DEBOUNCE 0x0a
+#define GB_GPIO_TYPE_IRQ_TYPE 0x0b
+#define GB_GPIO_TYPE_IRQ_ACK 0x0c
+#define GB_GPIO_TYPE_IRQ_MASK 0x0d
+#define GB_GPIO_TYPE_IRQ_UNMASK 0x0e
+#define GB_GPIO_TYPE_IRQ_EVENT 0x0f
#define GB_GPIO_TYPE_RESPONSE 0x80 /* OR'd with rest */
#define GB_GPIO_DEBOUNCE_USEC_DEFAULT 0 /* microseconds */
};
/* debounce response has no payload */
+struct gb_gpio_irq_type_request {
+ __u8 which;
+ __u8 type;
+};
+/* irq type response has no payload */
+
+struct gb_gpio_irq_mask_request {
+ __u8 which;
+};
+/* irq mask response has no payload */
+
+struct gb_gpio_irq_unmask_request {
+ __u8 which;
+};
+/* irq unmask response has no payload */
+
+struct gb_gpio_irq_ack_request {
+ __u8 which;
+};
+/* irq ack response has no payload */
+
+/* irq event requests originate on another module and are handled on the AP */
+struct gb_gpio_irq_event_request {
+ __u8 which;
+};
+/* irq event response has no payload */
/* Define get_version() routine */
define_get_version(gb_gpio_controller, GPIO);
return ret;
}
+static void gb_gpio_ack_irq(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_to_gpio_chip(d);
+ struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+ struct gb_gpio_irq_ack_request request;
+ int ret;
+
+ request.which = d->hwirq;
+ ret = gb_operation_sync(ggc->connection,
+ GB_GPIO_TYPE_IRQ_ACK,
+ &request, sizeof(request), NULL, 0);
+ if (ret)
+ pr_err("irq ack operation failed (%d)\n", ret);
+}
+
+static void gb_gpio_mask_irq(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_to_gpio_chip(d);
+ struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+ struct gb_gpio_irq_mask_request request;
+ int ret;
+
+ request.which = d->hwirq;
+ ret = gb_operation_sync(ggc->connection,
+ GB_GPIO_TYPE_IRQ_MASK,
+ &request, sizeof(request), NULL, 0);
+ if (ret)
+ pr_err("irq mask operation failed (%d)\n", ret);
+}
+
+static void gb_gpio_unmask_irq(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_to_gpio_chip(d);
+ struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+ struct gb_gpio_irq_unmask_request request;
+ int ret;
+
+ request.which = d->hwirq;
+ ret = gb_operation_sync(ggc->connection,
+ GB_GPIO_TYPE_IRQ_UNMASK,
+ &request, sizeof(request), NULL, 0);
+ if (ret)
+ pr_err("irq unmask operation failed (%d)\n", ret);
+}
+
+static int gb_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct gpio_chip *chip = irq_data_to_gpio_chip(d);
+ struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+ struct gb_gpio_irq_type_request request;
+ int ret = 0;
+
+ request.which = d->hwirq;
+ request.type = type;
+
+ switch (type) {
+ case IRQ_TYPE_NONE:
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ case IRQ_TYPE_EDGE_FALLING:
+ case IRQ_TYPE_EDGE_BOTH:
+ case IRQ_TYPE_LEVEL_LOW:
+ case IRQ_TYPE_LEVEL_HIGH:
+ ret = gb_operation_sync(ggc->connection,
+ GB_GPIO_TYPE_IRQ_TYPE,
+ &request, sizeof(request), NULL, 0);
+ if (ret)
+ pr_err("irq type operation failed (%d)\n", ret);
+ break;
+ default:
+ pr_err("No such irq type %d", type);
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static void gb_gpio_request_recv(u8 type, struct gb_operation *op)
+{
+ struct gb_gpio_controller *ggc;
+ struct gb_connection *connection;
+ struct gb_message *request;
+ struct gb_gpio_irq_event_request *event;
+ int irq;
+ struct irq_desc *desc;
+ int ret;
+
+ if (type != GB_GPIO_TYPE_IRQ_EVENT) {
+ pr_err("unsupported unsolicited request\n");
+ return;
+ }
+
+ connection = op->connection;
+ ggc = connection->private;
+
+ request = op->request;
+ event = request->payload;
+ if (event->which > ggc->line_max) {
+ pr_err("Unsupported hw irq %d\n", event->which);
+ return;
+ }
+ irq = gpio_to_irq(ggc->irq_base + event->which);
+ desc = irq_to_desc(irq);
+
+ /* Dispatch interrupt */
+ local_irq_disable();
+ handle_simple_irq(irq, desc);
+ local_irq_enable();
+
+ ret = gb_operation_response_send(op, 0);
+ if (ret)
+ pr_err("error %d sending response status %d\n", ret, 0);
+}
+
static int gb_gpio_request(struct gpio_chip *chip, unsigned offset)
{
struct gb_gpio_controller *gb_gpio_controller = gpio_chip_to_gb_gpio_controller(chip);
return 0; /* XXX */
}
-static int gb_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
- if (offset >= chip->ngpio)
- return -EINVAL;
-
- return 0; /* XXX */
-}
-
static void gb_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
return; /* XXX */
return ret;
}
+/**
+ * gb_gpio_irq_map() - maps an IRQ into a GB gpio irqchip
+ * @d: the irqdomain used by this irqchip
+ * @irq: the global irq number used by this GB gpio irqchip irq
+ * @hwirq: the local IRQ/GPIO line offset on this GB gpio
+ *
+ * This function will set up the mapping for a certain IRQ line on a
+ * GB gpio by assigning the GB gpio as chip data, and using the irqchip
+ * stored inside the GB gpio.
+ */
+static int gb_gpio_irq_map(struct irq_domain *domain, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ struct gpio_chip *chip = domain->host_data;
+ struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+
+ irq_set_chip_data(irq, ggc);
+ irq_set_chip_and_handler(irq, ggc->irqchip, ggc->irq_handler);
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, IRQF_VALID);
+#else
+ irq_set_noprobe(irq);
+#endif
+ /*
+ * No set-up of the hardware will happen if IRQ_TYPE_NONE
+ * is passed as default type.
+ */
+ if (ggc->irq_default_type != IRQ_TYPE_NONE)
+ irq_set_irq_type(irq, ggc->irq_default_type);
+
+ return 0;
+}
+
+static void gb_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, 0);
+#endif
+ irq_set_chip_and_handler(irq, NULL, NULL);
+ irq_set_chip_data(irq, NULL);
+}
+
+static const struct irq_domain_ops gb_gpio_domain_ops = {
+ .map = gb_gpio_irq_map,
+ .unmap = gb_gpio_irq_unmap,
+};
+
+/**
+ * gb_gpio_irqchip_remove() - removes an irqchip added to a gb_gpio_controller
+ * @ggc: the gb_gpio_controller to remove the irqchip from
+ *
+ * This is called only from gb_gpio_remove()
+ */
+static void gb_gpio_irqchip_remove(struct gb_gpio_controller *ggc)
+{
+ unsigned int offset;
+
+ /* Remove all IRQ mappings and delete the domain */
+ if (ggc->irqdomain) {
+ for (offset = 0; offset < (ggc->line_max + 1); offset++)
+ irq_dispose_mapping(irq_find_mapping(ggc->irqdomain, offset));
+ irq_domain_remove(ggc->irqdomain);
+ }
+
+ if (ggc->irqchip) {
+ ggc->irqchip = NULL;
+ }
+}
+
+
+/**
+ * gb_gpio_irqchip_add() - adds an irqchip to a gpio chip
+ * @chip: the gpio chip to add the irqchip to
+ * @irqchip: the irqchip to add to the adapter
+ * @first_irq: if not dynamically assigned, the base (first) IRQ to
+ * allocate gpio irqs from
+ * @handler: the irq handler to use (often a predefined irq core function)
+ * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE
+ * to have the core avoid setting up any default type in the hardware.
+ *
+ * This function closely associates a certain irqchip with a certain
+ * gpio chip, providing an irq domain to translate the local IRQs to
+ * global irqs, and making sure that the gpio chip
+ * is passed as chip data to all related functions. Driver callbacks
+ * need to use container_of() to get their local state containers back
+ * from the gpio chip passed as chip data. An irqdomain will be stored
+ * in the gpio chip that shall be used by the driver to handle IRQ number
+ * translation. The gpio chip will need to be initialized and registered
+ * before calling this function.
+ */
+static int gb_gpio_irqchip_add(struct gpio_chip *chip,
+ struct irq_chip *irqchip,
+ unsigned int first_irq,
+ irq_flow_handler_t handler,
+ unsigned int type)
+{
+ struct gb_gpio_controller *ggc;
+ unsigned int offset;
+ unsigned irq_base;
+
+ if (!chip || !irqchip)
+ return -EINVAL;
+
+ ggc = gpio_chip_to_gb_gpio_controller(chip);
+
+ ggc->irqchip = irqchip;
+ ggc->irq_handler = handler;
+ ggc->irq_default_type = type;
+ ggc->irqdomain = irq_domain_add_simple(NULL,
+ ggc->line_max + 1, first_irq,
+ &gb_gpio_domain_ops, chip);
+ if (!ggc->irqdomain) {
+ ggc->irqchip = NULL;
+ return -EINVAL;
+ }
+
+ /*
+ * Prepare the mapping since the irqchip shall be orthogonal to
+ * any gpio calls. If the first_irq was zero, this is
+ * necessary to allocate descriptors for all IRQs.
+ */
+ for (offset = 0; offset < (ggc->line_max + 1); offset++) {
+ irq_base = irq_create_mapping(ggc->irqdomain, offset);
+ if (offset == 0)
+ ggc->irq_base = irq_base;
+ }
+
+ return 0;
+}
+
+static int gb_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+
+ return irq_find_mapping(ggc->irqdomain, offset);
+}
+
static int gb_gpio_connection_init(struct gb_connection *connection)
{
struct gb_gpio_controller *gb_gpio_controller;
struct gpio_chip *gpio;
+ struct irq_chip *irqc;
int ret;
gb_gpio_controller = kzalloc(sizeof(*gb_gpio_controller), GFP_KERNEL);
if (ret)
goto out_err;
+ irqc = &gb_gpio_controller->irqc;
+ irqc->irq_ack = gb_gpio_ack_irq;
+ irqc->irq_mask = gb_gpio_mask_irq;
+ irqc->irq_unmask = gb_gpio_unmask_irq;
+ irqc->irq_set_type = gb_gpio_irq_set_type;
+ irqc->name = "greybus_gpio";
+
gpio = &gb_gpio_controller->chip;
gpio->label = "greybus_gpio";
+ gpio->dev = &connection->dev;
gpio->owner = THIS_MODULE; /* XXX Module get? */
gpio->request = gb_gpio_request;
gpio->get = gb_gpio_get;
gpio->set = gb_gpio_set;
gpio->set_debounce = gb_gpio_set_debounce;
- gpio->to_irq = gb_gpio_to_irq;
gpio->dbg_show = gb_gpio_dbg_show;
-
+ gpio->to_irq = gb_gpio_to_irq;
gpio->base = -1; /* Allocate base dynamically */
gpio->ngpio = gb_gpio_controller->line_max + 1;
gpio->can_sleep = true; /* XXX */
ret = gpiochip_add(gpio);
if (ret) {
pr_err("Failed to register GPIO\n");
- return ret;
+ goto out_err;
+ }
+
+ ret = gb_gpio_irqchip_add(gpio, irqc, 0,
+ handle_simple_irq, IRQ_TYPE_NONE);
+ if (ret) {
+ pr_err("Couldn't add irqchip to Greybus GPIO controller %d\n", ret);
+ goto irqchip_err;
}
return 0;
+
+irqchip_err:
+ gb_gpiochip_remove(gpio);
out_err:
kfree(gb_gpio_controller);
return ret;
if (!gb_gpio_controller)
return;
+ gb_gpio_irqchip_remove(gb_gpio_controller);
gb_gpiochip_remove(&gb_gpio_controller->chip);
/* kref_put(gb_gpio_controller->connection) */
kfree(gb_gpio_controller);
.minor = 1,
.connection_init = gb_gpio_connection_init,
.connection_exit = gb_gpio_connection_exit,
- .request_recv = NULL, /* no incoming requests */
+ .request_recv = gb_gpio_request_recv,
};
int gb_gpio_protocol_init(void)
projects / platform / kernel / linux-starfive.git / commitdiff