[PATCH v4 1/3] gpio: xgene: Enable X-Gene standby GPIO as interrupt controller
Quan Nguyen
qnguyen at apm.com
Mon Jan 25 23:22:13 PST 2016
Enable X-Gene standby GPIO controller as interrupt controller to provide
its own resources. This avoids ambiguity where GIC interrupt resource is
use as X-Gene standby GPIO interrupt resource in user driver.
Signed-off-by: Y Vo <yvo at apm.com>
Signed-off-by: Quan Nguyen <qnguyen at apm.com>
---
drivers/gpio/gpio-xgene-sb.c | 331 ++++++++++++++++++++++++++++++++++++-------
1 file changed, 276 insertions(+), 55 deletions(-)
diff --git a/drivers/gpio/gpio-xgene-sb.c b/drivers/gpio/gpio-xgene-sb.c
index 282004d..b703114 100644
--- a/drivers/gpio/gpio-xgene-sb.c
+++ b/drivers/gpio/gpio-xgene-sb.c
@@ -2,8 +2,9 @@
* AppliedMicro X-Gene SoC GPIO-Standby Driver
*
* Copyright (c) 2014, Applied Micro Circuits Corporation
- * Author: Tin Huynh <tnhuynh at apm.com>.
- * Y Vo <yvo at apm.com>.
+ * Author: Tin Huynh <tnhuynh at apm.com>.
+ * Y Vo <yvo at apm.com>.
+ * Quan Nguyen <qnguyen at apm.com>.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
@@ -22,14 +23,20 @@
#include <linux/module.h>
#include <linux/io.h>
#include <linux/platform_device.h>
+#include <linux/of_platform.h>
#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
#include <linux/gpio/driver.h>
#include <linux/acpi.h>
#include "gpiolib.h"
-#define XGENE_MAX_GPIO_DS 22
-#define XGENE_MAX_GPIO_DS_IRQ 6
+#define XGENE_MAX_NGPIO 22
+#define XGENE_MAX_NIRQ 6
+#define XGENE_IRQ_START_PIN 8
+#define SBGPIO_XGENE ((XGENE_IRQ_START_PIN << 24) | \
+ (XGENE_MAX_NIRQ << 16) | \
+ (XGENE_MAX_NGPIO << 8))
#define GPIO_MASK(x) (1U << ((x) % 32))
@@ -39,19 +46,30 @@
#define MPA_GPIO_IN_ADDR 0x02a4
#define MPA_GPIO_SEL_LO 0x0294
+#define GPIO_INT_LEVEL_H 0x000001
+#define GPIO_INT_LEVEL_L 0x000000
+
/**
* struct xgene_gpio_sb - GPIO-Standby private data structure.
* @gc: memory-mapped GPIO controllers.
- * @irq: Mapping GPIO pins and interrupt number
- * nirq: Number of GPIO pins that supports interrupt
+ * @regs: GPIO register base offset
+ * @irq_domain: GPIO interrupt domain
+ * flags: GPIO per-instance flags assigned by the driver
*/
struct xgene_gpio_sb {
struct gpio_chip gc;
- u32 *irq;
- u32 nirq;
+ void __iomem *regs;
+ struct irq_domain *irq_domain;
+ u32 flags;
};
-static void xgene_gpio_set_bit(struct gpio_chip *gc, void __iomem *reg, u32 gpio, int val)
+#define IRQ_START_PIN(priv) (((priv)->flags >> 24) & 0xff)
+#define NIRQ_MAX(priv) (((priv)->flags >> 16) & 0xff)
+#define NGPIO_MAX(priv) (((priv)->flags >> 8) & 0xff)
+#define START_PARENT_IRQ(priv) ((priv)->flags & 0xff)
+
+static void xgene_gpio_set_bit(struct gpio_chip *gc,
+ void __iomem *reg, u32 gpio, int val)
{
u32 data;
@@ -63,23 +81,216 @@ static void xgene_gpio_set_bit(struct gpio_chip *gc, void __iomem *reg, u32 gpio
gc->write_reg(reg, data);
}
-static int apm_gpio_sb_to_irq(struct gpio_chip *gc, u32 gpio)
+static int xgene_gpio_sb_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct xgene_gpio_sb *priv = irq_data_get_irq_chip_data(d);
+ int gpio = d->hwirq + IRQ_START_PIN(priv);
+ int lvl_type;
+ int ret;
+
+ switch (type & IRQ_TYPE_SENSE_MASK) {
+ case IRQ_TYPE_EDGE_RISING:
+ case IRQ_TYPE_LEVEL_HIGH:
+ lvl_type = GPIO_INT_LEVEL_H;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ case IRQ_TYPE_LEVEL_LOW:
+ lvl_type = GPIO_INT_LEVEL_L;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = gpiochip_lock_as_irq(&priv->gc, gpio);
+ if (ret) {
+ dev_err(priv->gc.parent,
+ "Unable to configure XGene GPIO standby pin %d as IRQ\n",
+ gpio);
+ return ret;
+ }
+
+ if ((gpio >= IRQ_START_PIN(priv)) &&
+ (d->hwirq < NIRQ_MAX(priv))) {
+ xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
+ gpio * 2, 1);
+ xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_INT_LVL,
+ d->hwirq, lvl_type);
+ }
+
+ /* Propagate IRQ type setting to parent */
+ if (type & IRQ_TYPE_EDGE_BOTH)
+ return irq_chip_set_type_parent(d, IRQ_TYPE_EDGE_RISING);
+ else
+ return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);
+}
+
+static void xgene_gpio_sb_irq_shutdown(struct irq_data *d)
+{
+ struct xgene_gpio_sb *priv = irq_data_get_irq_chip_data(d);
+
+ gpiochip_unlock_as_irq(&priv->gc, d->hwirq + IRQ_START_PIN(priv));
+}
+
+static struct irq_chip xgene_gpio_sb_irq_chip = {
+ .name = "sbgpio",
+ .irq_ack = irq_chip_ack_parent,
+ .irq_eoi = irq_chip_eoi_parent,
+ .irq_mask = irq_chip_mask_parent,
+ .irq_unmask = irq_chip_unmask_parent,
+ .irq_set_type = xgene_gpio_sb_irq_set_type,
+ .irq_shutdown = xgene_gpio_sb_irq_shutdown,
+};
+
+static int xgene_gpio_sb_to_irq(struct gpio_chip *gc, u32 gpio)
{
struct xgene_gpio_sb *priv = gpiochip_get_data(gc);
+ struct irq_fwspec fwspec;
+ unsigned int virq;
+
+ if ((gpio < IRQ_START_PIN(priv)) ||
+ (gpio > NIRQ_MAX(priv) + IRQ_START_PIN(priv)))
+ return -ENXIO;
+ if (gc->parent->of_node)
+ fwspec.fwnode = of_node_to_fwnode(gc->parent->of_node);
+ else
+ fwspec.fwnode = gc->parent->fwnode;
+ fwspec.param_count = 2;
+ fwspec.param[0] = gpio - IRQ_START_PIN(priv);
+ fwspec.param[1] = IRQ_TYPE_NONE;
+ virq = irq_find_mapping(priv->irq_domain, gpio - IRQ_START_PIN(priv));
+ if (!virq)
+ virq = irq_domain_alloc_irqs(priv->irq_domain, 1,
+ NUMA_NO_NODE, &fwspec);
+ return virq;
+}
+
+static void xgene_gpio_sb_domain_activate(struct irq_domain *d,
+ struct irq_data *irq_data)
+{
+ struct xgene_gpio_sb *priv = d->host_data;
+ u32 gpio = irq_data->hwirq + IRQ_START_PIN(priv);
- if (priv->irq[gpio])
- return priv->irq[gpio];
+ if ((gpio < IRQ_START_PIN(priv)) ||
+ (gpio > NIRQ_MAX(priv) + IRQ_START_PIN(priv)))
+ return;
- return -ENXIO;
+ xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
+ gpio * 2, 1);
+}
+
+static void xgene_gpio_sb_domain_deactivate(struct irq_domain *d,
+ struct irq_data *irq_data)
+{
+ struct xgene_gpio_sb *priv = d->host_data;
+ u32 gpio = irq_data->hwirq + IRQ_START_PIN(priv);
+
+ if ((gpio < IRQ_START_PIN(priv)) ||
+ (gpio > NIRQ_MAX(priv) + IRQ_START_PIN(priv)))
+ return;
+
+ xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
+ gpio * 2, 0);
+}
+
+static int xgene_gpio_sb_domain_translate(struct irq_domain *d,
+ struct irq_fwspec *fwspec,
+ unsigned long *hwirq,
+ unsigned int *type)
+{
+ if (fwspec->param_count != 2)
+ return -EINVAL;
+ *hwirq = fwspec->param[0];
+ *type = fwspec->param[1];
+ return 0;
+}
+
+static int xgene_gpio_sb_domain_alloc(struct irq_domain *domain,
+ unsigned int virq,
+ unsigned int nr_irqs, void *data)
+{
+ struct irq_fwspec *fwspec = data;
+ struct irq_fwspec parent_fwspec;
+ struct xgene_gpio_sb *priv = domain->host_data;
+ irq_hw_number_t hwirq;
+ unsigned int type = IRQ_TYPE_NONE;
+ unsigned int i;
+ u32 ret;
+
+ ret = xgene_gpio_sb_domain_translate(domain, fwspec, &hwirq, &type);
+ if (ret)
+ return ret;
+
+ hwirq = fwspec->param[0];
+ if ((hwirq >= NIRQ_MAX(priv)) ||
+ (hwirq + nr_irqs > NIRQ_MAX(priv)))
+ return -EINVAL;
+
+ for (i = 0; i < nr_irqs; i++)
+ irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
+ &xgene_gpio_sb_irq_chip, priv);
+
+ if (is_of_node(domain->parent->fwnode)) {
+ parent_fwspec.fwnode = domain->parent->fwnode;
+ parent_fwspec.param_count = 3;
+ parent_fwspec.param[0] = 0;/* SPI */
+ /* Skip SGIs and PPIs*/
+ parent_fwspec.param[1] = hwirq + START_PARENT_IRQ(priv) - 32;
+ parent_fwspec.param[2] = fwspec->param[1];
+ } else if (is_fwnode_irqchip(domain->parent->fwnode)) {
+ parent_fwspec.fwnode = domain->parent->fwnode;
+ parent_fwspec.param_count = 2;
+ parent_fwspec.param[0] = hwirq + START_PARENT_IRQ(priv);
+ parent_fwspec.param[1] = fwspec->param[1];
+ } else
+ return -EINVAL;
+
+ return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
+ &parent_fwspec);
+}
+
+static void xgene_gpio_sb_domain_free(struct irq_domain *domain,
+ unsigned int virq,
+ unsigned int nr_irqs)
+{
+ struct irq_data *d;
+ unsigned int i;
+
+ for (i = 0; i < nr_irqs; i++) {
+ d = irq_domain_get_irq_data(domain, virq + i);
+ irq_domain_reset_irq_data(d);
+ }
}
+static const struct irq_domain_ops xgene_gpio_sb_domain_ops = {
+ .translate = xgene_gpio_sb_domain_translate,
+ .alloc = xgene_gpio_sb_domain_alloc,
+ .free = xgene_gpio_sb_domain_free,
+ .activate = xgene_gpio_sb_domain_activate,
+ .deactivate = xgene_gpio_sb_domain_deactivate,
+};
+
+static const struct of_device_id xgene_gpio_sb_of_match[] = {
+ {.compatible = "apm,xgene-gpio-sb", .data = (const void *)SBGPIO_XGENE},
+ {},
+};
+MODULE_DEVICE_TABLE(of, xgene_gpio_sb_of_match);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id xgene_gpio_sb_acpi_match[] = {
+ {"APMC0D15", SBGPIO_XGENE},
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, xgene_gpio_sb_acpi_match);
+#endif
+
static int xgene_gpio_sb_probe(struct platform_device *pdev)
{
struct xgene_gpio_sb *priv;
- u32 ret, i;
- u32 default_lines[] = {0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D};
+ u32 ret;
struct resource *res;
void __iomem *regs;
+ const struct of_device_id *of_id;
+ struct irq_domain *parent_domain = NULL;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -90,6 +301,32 @@ static int xgene_gpio_sb_probe(struct platform_device *pdev)
if (IS_ERR(regs))
return PTR_ERR(regs);
+ priv->regs = regs;
+
+ of_id = of_match_device(xgene_gpio_sb_of_match, &pdev->dev);
+ if (of_id)
+ priv->flags = (uintptr_t)of_id->data;
+#ifdef CONFIG_ACPI
+ else {
+ const struct acpi_device_id *acpi_id;
+
+ acpi_id = acpi_match_device(xgene_gpio_sb_acpi_match,
+ &pdev->dev);
+ if (acpi_id)
+ priv->flags = (uintptr_t)acpi_id->driver_data;
+ }
+#endif
+ ret = platform_get_irq(pdev, 0);
+ if (ret > 0) {
+ priv->flags &= ~0xff;
+ priv->flags |= irq_get_irq_data(ret)->hwirq & 0xff;
+ parent_domain = irq_get_irq_data(ret)->domain;
+ }
+ if (!parent_domain) {
+ dev_err(&pdev->dev, "unable to obtain parent domain\n");
+ return -ENODEV;
+ }
+
ret = bgpio_init(&priv->gc, &pdev->dev, 4,
regs + MPA_GPIO_IN_ADDR,
regs + MPA_GPIO_OUT_ADDR, NULL,
@@ -97,36 +334,34 @@ static int xgene_gpio_sb_probe(struct platform_device *pdev)
if (ret)
return ret;
- priv->gc.to_irq = apm_gpio_sb_to_irq;
- priv->gc.ngpio = XGENE_MAX_GPIO_DS;
-
- priv->nirq = XGENE_MAX_GPIO_DS_IRQ;
+ priv->gc.to_irq = xgene_gpio_sb_to_irq;
+ priv->gc.ngpio = NGPIO_MAX(priv);
- priv->irq = devm_kzalloc(&pdev->dev, sizeof(u32) * XGENE_MAX_GPIO_DS,
- GFP_KERNEL);
- if (!priv->irq)
- return -ENOMEM;
+ platform_set_drvdata(pdev, priv);
- for (i = 0; i < priv->nirq; i++) {
- priv->irq[default_lines[i]] = platform_get_irq(pdev, i);
- xgene_gpio_set_bit(&priv->gc, regs + MPA_GPIO_SEL_LO,
- default_lines[i] * 2, 1);
- xgene_gpio_set_bit(&priv->gc, regs + MPA_GPIO_INT_LVL, i, 1);
- }
+ priv->irq_domain = irq_domain_create_hierarchy(parent_domain,
+ 0, NIRQ_MAX(priv),
+ of_node_to_fwnode(pdev->dev.of_node),
+ &xgene_gpio_sb_domain_ops, priv);
+ if (!priv->irq_domain)
+ return -ENODEV;
- platform_set_drvdata(pdev, priv);
+ priv->gc.irqdomain = priv->irq_domain;
ret = gpiochip_add_data(&priv->gc, priv);
- if (ret)
- dev_err(&pdev->dev, "failed to register X-Gene GPIO Standby driver\n");
- else
- dev_info(&pdev->dev, "X-Gene GPIO Standby driver registered\n");
-
- if (priv->nirq > 0) {
- /* Register interrupt handlers for gpio signaled acpi events */
- acpi_gpiochip_request_interrupts(&priv->gc);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "failed to register X-Gene GPIO Standby driver\n");
+ if (priv->irq_domain)
+ irq_domain_remove(priv->irq_domain);
+ return ret;
}
+ dev_info(&pdev->dev, "X-Gene GPIO Standby driver registered\n");
+
+ /* Register interrupt handlers for gpio signaled acpi events */
+ acpi_gpiochip_request_interrupts(&priv->gc);
+
return ret;
}
@@ -134,28 +369,14 @@ static int xgene_gpio_sb_remove(struct platform_device *pdev)
{
struct xgene_gpio_sb *priv = platform_get_drvdata(pdev);
- if (priv->nirq > 0) {
- acpi_gpiochip_free_interrupts(&priv->gc);
- }
+ acpi_gpiochip_free_interrupts(&priv->gc);
+
+ irq_domain_remove(priv->irq_domain);
gpiochip_remove(&priv->gc);
return 0;
}
-static const struct of_device_id xgene_gpio_sb_of_match[] = {
- {.compatible = "apm,xgene-gpio-sb", },
- {},
-};
-MODULE_DEVICE_TABLE(of, xgene_gpio_sb_of_match);
-
-#ifdef CONFIG_ACPI
-static const struct acpi_device_id xgene_gpio_sb_acpi_match[] = {
- {"APMC0D15", 0},
- {},
-};
-MODULE_DEVICE_TABLE(acpi, xgene_gpio_sb_acpi_match);
-#endif
-
static struct platform_driver xgene_gpio_sb_driver = {
.driver = {
.name = "xgene-gpio-sb",
--
1.7.12.4
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