#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/io.h>
+#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
struct clk *clk;
const struct owl_pinctrl_soc_data *soc;
void __iomem *base;
+ struct irq_chip irq_chip;
+ unsigned int num_irq;
+ unsigned int *irq;
};
static void owl_update_bits(void __iomem *base, u32 mask, u32 val)
return 0;
}
+static void irq_set_type(struct owl_pinctrl *pctrl, int gpio, unsigned int type)
+{
+ const struct owl_gpio_port *port;
+ void __iomem *gpio_base;
+ unsigned long flags;
+ unsigned int offset, value, irq_type = 0;
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_BOTH:
+ /*
+ * Since the hardware doesn't support interrupts on both edges,
+ * emulate it in the software by setting the single edge
+ * interrupt and switching to the opposite edge while ACKing
+ * the interrupt
+ */
+ if (owl_gpio_get(&pctrl->chip, gpio))
+ irq_type = OWL_GPIO_INT_EDGE_FALLING;
+ else
+ irq_type = OWL_GPIO_INT_EDGE_RISING;
+ break;
+
+ case IRQ_TYPE_EDGE_RISING:
+ irq_type = OWL_GPIO_INT_EDGE_RISING;
+ break;
+
+ case IRQ_TYPE_EDGE_FALLING:
+ irq_type = OWL_GPIO_INT_EDGE_FALLING;
+ break;
+
+ case IRQ_TYPE_LEVEL_HIGH:
+ irq_type = OWL_GPIO_INT_LEVEL_HIGH;
+ break;
+
+ case IRQ_TYPE_LEVEL_LOW:
+ irq_type = OWL_GPIO_INT_LEVEL_LOW;
+ break;
+
+ default:
+ break;
+ }
+
+ port = owl_gpio_get_port(pctrl, &gpio);
+ if (WARN_ON(port == NULL))
+ return;
+
+ gpio_base = pctrl->base + port->offset;
+
+ raw_spin_lock_irqsave(&pctrl->lock, flags);
+
+ offset = (gpio < 16) ? 4 : 0;
+ value = readl_relaxed(gpio_base + port->intc_type + offset);
+ value &= ~(OWL_GPIO_INT_MASK << ((gpio % 16) * 2));
+ value |= irq_type << ((gpio % 16) * 2);
+ writel_relaxed(value, gpio_base + port->intc_type + offset);
+
+ raw_spin_unlock_irqrestore(&pctrl->lock, flags);
+}
+
+static void owl_gpio_irq_mask(struct irq_data *data)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+ struct owl_pinctrl *pctrl = gpiochip_get_data(gc);
+ const struct owl_gpio_port *port;
+ void __iomem *gpio_base;
+ unsigned long flags;
+ unsigned int gpio = data->hwirq;
+ u32 val;
+
+ port = owl_gpio_get_port(pctrl, &gpio);
+ if (WARN_ON(port == NULL))
+ return;
+
+ gpio_base = pctrl->base + port->offset;
+
+ raw_spin_lock_irqsave(&pctrl->lock, flags);
+
+ owl_gpio_update_reg(gpio_base + port->intc_msk, gpio, false);
+
+ /* disable port interrupt if no interrupt pending bit is active */
+ val = readl_relaxed(gpio_base + port->intc_msk);
+ if (val == 0)
+ owl_gpio_update_reg(gpio_base + port->intc_ctl,
+ OWL_GPIO_CTLR_ENABLE, false);
+
+ raw_spin_unlock_irqrestore(&pctrl->lock, flags);
+}
+
+static void owl_gpio_irq_unmask(struct irq_data *data)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+ struct owl_pinctrl *pctrl = gpiochip_get_data(gc);
+ const struct owl_gpio_port *port;
+ void __iomem *gpio_base;
+ unsigned long flags;
+ unsigned int gpio = data->hwirq;
+ u32 value;
+
+ port = owl_gpio_get_port(pctrl, &gpio);
+ if (WARN_ON(port == NULL))
+ return;
+
+ gpio_base = pctrl->base + port->offset;
+ raw_spin_lock_irqsave(&pctrl->lock, flags);
+
+ /* enable port interrupt */
+ value = readl_relaxed(gpio_base + port->intc_ctl);
+ value |= BIT(OWL_GPIO_CTLR_ENABLE) | BIT(OWL_GPIO_CTLR_SAMPLE_CLK_24M);
+ writel_relaxed(value, gpio_base + port->intc_ctl);
+
+ /* enable GPIO interrupt */
+ owl_gpio_update_reg(gpio_base + port->intc_msk, gpio, true);
+
+ raw_spin_unlock_irqrestore(&pctrl->lock, flags);
+}
+
+static void owl_gpio_irq_ack(struct irq_data *data)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+ struct owl_pinctrl *pctrl = gpiochip_get_data(gc);
+ const struct owl_gpio_port *port;
+ void __iomem *gpio_base;
+ unsigned long flags;
+ unsigned int gpio = data->hwirq;
+
+ /*
+ * Switch the interrupt edge to the opposite edge of the interrupt
+ * which got triggered for the case of emulating both edges
+ */
+ if (irqd_get_trigger_type(data) == IRQ_TYPE_EDGE_BOTH) {
+ if (owl_gpio_get(gc, gpio))
+ irq_set_type(pctrl, gpio, IRQ_TYPE_EDGE_FALLING);
+ else
+ irq_set_type(pctrl, gpio, IRQ_TYPE_EDGE_RISING);
+ }
+
+ port = owl_gpio_get_port(pctrl, &gpio);
+ if (WARN_ON(port == NULL))
+ return;
+
+ gpio_base = pctrl->base + port->offset;
+
+ raw_spin_lock_irqsave(&pctrl->lock, flags);
+
+ owl_gpio_update_reg(gpio_base + port->intc_ctl,
+ OWL_GPIO_CTLR_PENDING, true);
+
+ raw_spin_unlock_irqrestore(&pctrl->lock, flags);
+}
+
+static int owl_gpio_irq_set_type(struct irq_data *data, unsigned int type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+ struct owl_pinctrl *pctrl = gpiochip_get_data(gc);
+
+ if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
+ irq_set_handler_locked(data, handle_level_irq);
+ else
+ irq_set_handler_locked(data, handle_edge_irq);
+
+ irq_set_type(pctrl, data->hwirq, type);
+
+ return 0;
+}
+
+static void owl_gpio_irq_handler(struct irq_desc *desc)
+{
+ struct owl_pinctrl *pctrl = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct irq_domain *domain = pctrl->chip.irq.domain;
+ unsigned int parent = irq_desc_get_irq(desc);
+ const struct owl_gpio_port *port;
+ void __iomem *base;
+ unsigned int pin, irq, offset = 0, i;
+ unsigned long pending_irq;
+
+ chained_irq_enter(chip, desc);
+
+ for (i = 0; i < pctrl->soc->nports; i++) {
+ port = &pctrl->soc->ports[i];
+ base = pctrl->base + port->offset;
+
+ /* skip ports that are not associated with this irq */
+ if (parent != pctrl->irq[i])
+ goto skip;
+
+ pending_irq = readl_relaxed(base + port->intc_pd);
+
+ for_each_set_bit(pin, &pending_irq, port->pins) {
+ irq = irq_find_mapping(domain, offset + pin);
+ generic_handle_irq(irq);
+
+ /* clear pending interrupt */
+ owl_gpio_update_reg(base + port->intc_pd, pin, true);
+ }
+
+skip:
+ offset += port->pins;
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
static int owl_gpio_init(struct owl_pinctrl *pctrl)
{
struct gpio_chip *chip;
- int ret;
+ struct gpio_irq_chip *gpio_irq;
+ int ret, i, j, offset;
chip = &pctrl->chip;
chip->base = -1;
chip->owner = THIS_MODULE;
chip->of_node = pctrl->dev->of_node;
+ pctrl->irq_chip.name = chip->of_node->name;
+ pctrl->irq_chip.irq_ack = owl_gpio_irq_ack;
+ pctrl->irq_chip.irq_mask = owl_gpio_irq_mask;
+ pctrl->irq_chip.irq_unmask = owl_gpio_irq_unmask;
+ pctrl->irq_chip.irq_set_type = owl_gpio_irq_set_type;
+
+ gpio_irq = &chip->irq;
+ gpio_irq->chip = &pctrl->irq_chip;
+ gpio_irq->handler = handle_simple_irq;
+ gpio_irq->default_type = IRQ_TYPE_NONE;
+ gpio_irq->parent_handler = owl_gpio_irq_handler;
+ gpio_irq->parent_handler_data = pctrl;
+ gpio_irq->num_parents = pctrl->num_irq;
+ gpio_irq->parents = pctrl->irq;
+
+ gpio_irq->map = devm_kcalloc(pctrl->dev, chip->ngpio,
+ sizeof(*gpio_irq->map), GFP_KERNEL);
+ if (!gpio_irq->map)
+ return -ENOMEM;
+
+ for (i = 0, offset = 0; i < pctrl->soc->nports; i++) {
+ const struct owl_gpio_port *port = &pctrl->soc->ports[i];
+
+ for (j = 0; j < port->pins; j++)
+ gpio_irq->map[offset + j] = gpio_irq->parents[i];
+
+ offset += port->pins;
+ }
+
ret = gpiochip_add_data(&pctrl->chip, pctrl);
if (ret) {
dev_err(pctrl->dev, "failed to register gpiochip\n");
{
struct resource *res;
struct owl_pinctrl *pctrl;
- int ret;
+ int ret, i;
pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
if (!pctrl)
&owl_pinctrl_desc, pctrl);
if (IS_ERR(pctrl->pctrldev)) {
dev_err(&pdev->dev, "could not register Actions OWL pinmux driver\n");
- return PTR_ERR(pctrl->pctrldev);
+ ret = PTR_ERR(pctrl->pctrldev);
+ goto err_exit;
+ }
+
+ ret = platform_irq_count(pdev);
+ if (ret < 0)
+ goto err_exit;
+
+ pctrl->num_irq = ret;
+
+ pctrl->irq = devm_kcalloc(&pdev->dev, pctrl->num_irq,
+ sizeof(*pctrl->irq), GFP_KERNEL);
+ if (!pctrl->irq) {
+ ret = -ENOMEM;
+ goto err_exit;
+ }
+
+ for (i = 0; i < pctrl->num_irq ; i++) {
+ ret = platform_get_irq(pdev, i);
+ if (ret < 0)
+ goto err_exit;
+ pctrl->irq[i] = ret;
}
ret = owl_gpio_init(pctrl);
if (ret)
- return ret;
+ goto err_exit;
platform_set_drvdata(pdev, pctrl);
return 0;
+
+err_exit:
+ clk_disable_unprepare(pctrl->clk);
+
+ return ret;
}
projects / linux-2.6-microblaze.git / blobdiff