[PATCH v2 3/3] pinctrl: actions: Add interrupt support for OWL S900 SoC

From: Manivannan Sadhasivam
Date: Sat Jun 23 2018 - 01:00:57 EST

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Previous message: Manivannan Sadhasivam: "[PATCH v2 1/3] dt-bindings: pinctrl: Add gpio interrupt bindings for Actions S900 SoC"
In reply to: Manivannan Sadhasivam: "[PATCH v2 1/3] dt-bindings: pinctrl: Add gpio interrupt bindings for Actions S900 SoC"
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Add interrupt support for Actions Semi OWL S900 SoC.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
---
drivers/pinctrl/actions/Kconfig | 1 +
drivers/pinctrl/actions/pinctrl-owl.c | 271 ++++++++++++++++++++++++-
drivers/pinctrl/actions/pinctrl-owl.h | 22 +-
drivers/pinctrl/actions/pinctrl-s900.c | 31 +--
4 files changed, 307 insertions(+), 18 deletions(-)

diff --git a/drivers/pinctrl/actions/Kconfig b/drivers/pinctrl/actions/Kconfig
index 490927b4ea76..2397cb0f6011 100644
--- a/drivers/pinctrl/actions/Kconfig
+++ b/drivers/pinctrl/actions/Kconfig
@@ -5,6 +5,7 @@ config PINCTRL_OWL
select PINCONF
select GENERIC_PINCONF
select GPIOLIB
+ select GPIOLIB_IRQCHIP
help
Say Y here to enable Actions Semi OWL pinctrl driver

diff --git a/drivers/pinctrl/actions/pinctrl-owl.c b/drivers/pinctrl/actions/pinctrl-owl.c
index 76243caa08c6..ce032d71dad5 100644
--- a/drivers/pinctrl/actions/pinctrl-owl.c
+++ b/drivers/pinctrl/actions/pinctrl-owl.c
@@ -13,6 +13,7 @@
#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>
@@ -45,6 +46,9 @@ struct owl_pinctrl {
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)
@@ -701,10 +705,213 @@ static int owl_gpio_direction_output(struct gpio_chip *chip,
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;
@@ -714,6 +921,35 @@ static int owl_gpio_init(struct owl_pinctrl *pctrl)
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");
@@ -728,7 +964,7 @@ int owl_pinctrl_probe(struct platform_device *pdev,
{
struct resource *res;
struct owl_pinctrl *pctrl;
- int ret;
+ int ret, i;

pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
if (!pctrl)
@@ -772,14 +1008,41 @@ int owl_pinctrl_probe(struct platform_device *pdev,
&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++) {
+ pctrl->irq[i] = platform_get_irq(pdev, i);
+ if (pctrl->irq[i] < 0) {
+ ret = pctrl->irq[i];
+ goto err_exit;
+ }
}

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;
}
diff --git a/drivers/pinctrl/actions/pinctrl-owl.h b/drivers/pinctrl/actions/pinctrl-owl.h
index 74342378937c..a724d1d406d4 100644
--- a/drivers/pinctrl/actions/pinctrl-owl.h
+++ b/drivers/pinctrl/actions/pinctrl-owl.h
@@ -29,6 +29,18 @@ enum owl_pinconf_drv {
OWL_PINCONF_DRV_12MA,
};

+/* GPIO CTRL Bit Definition */
+#define OWL_GPIO_CTLR_PENDING 0
+#define OWL_GPIO_CTLR_ENABLE 1
+#define OWL_GPIO_CTLR_SAMPLE_CLK_24M 2
+
+/* GPIO TYPE Bit Definition */
+#define OWL_GPIO_INT_LEVEL_HIGH 0
+#define OWL_GPIO_INT_LEVEL_LOW 1
+#define OWL_GPIO_INT_EDGE_RISING 2
+#define OWL_GPIO_INT_EDGE_FALLING 3
+#define OWL_GPIO_INT_MASK 3
+
/**
* struct owl_pullctl - Actions pad pull control register
* @reg: offset to the pull control register
@@ -121,6 +133,10 @@ struct owl_pinmux_func {
* @outen: offset of the output enable register.
* @inen: offset of the input enable register.
* @dat: offset of the data register.
+ * @intc_ctl: offset of the interrupt control register.
+ * @intc_pd: offset of the interrupt pending register.
+ * @intc_msk: offset of the interrupt mask register.
+ * @intc_type: offset of the interrupt type register.
*/
struct owl_gpio_port {
unsigned int offset;
@@ -128,6 +144,10 @@ struct owl_gpio_port {
unsigned int outen;
unsigned int inen;
unsigned int dat;
+ unsigned int intc_ctl;
+ unsigned int intc_pd;
+ unsigned int intc_msk;
+ unsigned int intc_type;
};

/**
@@ -140,7 +160,7 @@ struct owl_gpio_port {
* @ngroups: number of entries in @groups.
* @padinfo: array describing the pad info of this SoC.
* @ngpios: number of pingroups the driver should expose as GPIOs.
- * @port: array describing all GPIO ports of this SoC.
+ * @ports: array describing all GPIO ports of this SoC.
* @nports: number of GPIO ports in this SoC.
*/
struct owl_pinctrl_soc_data {
diff --git a/drivers/pinctrl/actions/pinctrl-s900.c b/drivers/pinctrl/actions/pinctrl-s900.c
index 5503c7945764..ea67b14ef93b 100644
--- a/drivers/pinctrl/actions/pinctrl-s900.c
+++ b/drivers/pinctrl/actions/pinctrl-s900.c
@@ -1821,22 +1821,27 @@ static struct owl_padinfo s900_padinfo[NUM_PADS] = {
[SGPIO3] = PAD_INFO_PULLCTL_ST(SGPIO3)
};

-#define OWL_GPIO_PORT(port, base, count, _outen, _inen, _dat) \
- [OWL_GPIO_PORT_##port] = { \
- .offset = base, \
- .pins = count, \
- .outen = _outen, \
- .inen = _inen, \
- .dat = _dat, \
+#define OWL_GPIO_PORT(port, base, count, _outen, _inen, _dat, \
+ _intc_ctl, _intc_pd, _intc_msk, _intc_type) \
+ [OWL_GPIO_PORT_##port] = { \
+ .offset = base, \
+ .pins = count, \
+ .outen = _outen, \
+ .inen = _inen, \
+ .dat = _dat, \
+ .intc_ctl = _intc_ctl, \
+ .intc_pd = _intc_pd, \
+ .intc_msk = _intc_msk, \
+ .intc_type = _intc_type, \
}

static const struct owl_gpio_port s900_gpio_ports[] = {
- OWL_GPIO_PORT(A, 0x0000, 32, 0x0, 0x4, 0x8),
- OWL_GPIO_PORT(B, 0x000C, 32, 0x0, 0x4, 0x8),
- OWL_GPIO_PORT(C, 0x0018, 12, 0x0, 0x4, 0x8),
- OWL_GPIO_PORT(D, 0x0024, 30, 0x0, 0x4, 0x8),
- OWL_GPIO_PORT(E, 0x0030, 32, 0x0, 0x4, 0x8),
- OWL_GPIO_PORT(F, 0x00F0, 8, 0x0, 0x4, 0x8)
+ OWL_GPIO_PORT(A, 0x0000, 32, 0x0, 0x4, 0x8, 0x204, 0x208, 0x20C, 0x240),
+ OWL_GPIO_PORT(B, 0x000C, 32, 0x0, 0x4, 0x8, 0x534, 0x204, 0x208, 0x23C),
+ OWL_GPIO_PORT(C, 0x0018, 12, 0x0, 0x4, 0x8, 0x52C, 0x200, 0x204, 0x238),
+ OWL_GPIO_PORT(D, 0x0024, 30, 0x0, 0x4, 0x8, 0x524, 0x1FC, 0x200, 0x234),
+ OWL_GPIO_PORT(E, 0x0030, 32, 0x0, 0x4, 0x8, 0x51C, 0x1F8, 0x1FC, 0x230),
+ OWL_GPIO_PORT(F, 0x00F0, 8, 0x0, 0x4, 0x8, 0x460, 0x140, 0x144, 0x178)
};

static struct owl_pinctrl_soc_data s900_pinctrl_data = {
--
2.17.1

Next message: Sergey Senozhatsky: "Re: [RFC][PATCH 0/6] Use printk_safe context for TTY and UART port locks"
Previous message: Manivannan Sadhasivam: "[PATCH v2 1/3] dt-bindings: pinctrl: Add gpio interrupt bindings for Actions S900 SoC"
In reply to: Manivannan Sadhasivam: "[PATCH v2 1/3] dt-bindings: pinctrl: Add gpio interrupt bindings for Actions S900 SoC"
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