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path: root/drivers/gpio/gpio-em.c
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Diffstat (limited to 'drivers/gpio/gpio-em.c')
-rw-r--r--drivers/gpio/gpio-em.c228
1 files changed, 105 insertions, 123 deletions
diff --git a/drivers/gpio/gpio-em.c b/drivers/gpio/gpio-em.c
index 5cba855638bf..a214b0672726 100644
--- a/drivers/gpio/gpio-em.c
+++ b/drivers/gpio/gpio-em.c
@@ -1,20 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Emma Mobile GPIO Support - GIO
*
* Copyright (C) 2012 Magnus Damm
- *
- * 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 Free Software Foundation; either version 2 of the License
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/init.h>
@@ -27,10 +15,10 @@
#include <linux/irqdomain.h>
#include <linux/bitops.h>
#include <linux/err.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
#include <linux/slab.h>
#include <linux/module.h>
-#include <linux/platform_data/gpio-em.h>
+#include <linux/pinctrl/consumer.h>
struct em_gio_priv {
void __iomem *base0;
@@ -98,6 +86,29 @@ static void em_gio_irq_enable(struct irq_data *d)
em_gio_write(p, GIO_IEN, BIT(irqd_to_hwirq(d)));
}
+static int em_gio_irq_reqres(struct irq_data *d)
+{
+ struct em_gio_priv *p = irq_data_get_irq_chip_data(d);
+ int ret;
+
+ ret = gpiochip_lock_as_irq(&p->gpio_chip, irqd_to_hwirq(d));
+ if (ret) {
+ dev_err(p->gpio_chip.parent,
+ "unable to lock HW IRQ %lu for IRQ\n",
+ irqd_to_hwirq(d));
+ return ret;
+ }
+ return 0;
+}
+
+static void em_gio_irq_relres(struct irq_data *d)
+{
+ struct em_gio_priv *p = irq_data_get_irq_chip_data(d);
+
+ gpiochip_unlock_as_irq(&p->gpio_chip, irqd_to_hwirq(d));
+}
+
+
#define GIO_ASYNC(x) (x + 8)
static unsigned char em_gio_sense_table[IRQ_TYPE_SENSE_MASK + 1] = {
@@ -162,7 +173,7 @@ static irqreturn_t em_gio_irq_handler(int irq, void *dev_id)
while ((pending = em_gio_read(p, GIO_MST))) {
offset = __ffs(pending);
em_gio_write(p, GIO_IIR, BIT(offset));
- generic_handle_irq(irq_find_mapping(p->irq_domain, offset));
+ generic_handle_domain_irq(p->irq_domain, offset);
irqs_handled++;
}
@@ -171,7 +182,7 @@ static irqreturn_t em_gio_irq_handler(int irq, void *dev_id)
static inline struct em_gio_priv *gpio_to_priv(struct gpio_chip *chip)
{
- return container_of(chip, struct em_gio_priv, gpio_chip);
+ return gpiochip_get_data(chip);
}
static int em_gio_direction_input(struct gpio_chip *chip, unsigned offset)
@@ -182,7 +193,7 @@ static int em_gio_direction_input(struct gpio_chip *chip, unsigned offset)
static int em_gio_get(struct gpio_chip *chip, unsigned offset)
{
- return (int)(em_gio_read(gpio_to_priv(chip), GIO_I) & BIT(offset));
+ return !!(em_gio_read(gpio_to_priv(chip), GIO_I) & BIT(offset));
}
static void __em_gio_set(struct gpio_chip *chip, unsigned int reg,
@@ -190,16 +201,18 @@ static void __em_gio_set(struct gpio_chip *chip, unsigned int reg,
{
/* upper 16 bits contains mask and lower 16 actual value */
em_gio_write(gpio_to_priv(chip), reg,
- (1 << (shift + 16)) | (value << shift));
+ (BIT(shift + 16)) | (value << shift));
}
-static void em_gio_set(struct gpio_chip *chip, unsigned offset, int value)
+static int em_gio_set(struct gpio_chip *chip, unsigned int offset, int value)
{
/* output is split into two registers */
if (offset < 16)
__em_gio_set(chip, GIO_OL, offset, value);
else
__em_gio_set(chip, GIO_OH, offset - 16, value);
+
+ return 0;
}
static int em_gio_direction_output(struct gpio_chip *chip, unsigned offset,
@@ -216,90 +229,77 @@ static int em_gio_to_irq(struct gpio_chip *chip, unsigned offset)
return irq_create_mapping(gpio_to_priv(chip)->irq_domain, offset);
}
-static int em_gio_irq_domain_map(struct irq_domain *h, unsigned int virq,
- irq_hw_number_t hw)
+static void em_gio_free(struct gpio_chip *chip, unsigned offset)
+{
+ pinctrl_gpio_free(chip, offset);
+
+ /* Set the GPIO as an input to ensure that the next GPIO request won't
+ * drive the GPIO pin as an output.
+ */
+ em_gio_direction_input(chip, offset);
+}
+
+static int em_gio_irq_domain_map(struct irq_domain *h, unsigned int irq,
+ irq_hw_number_t hwirq)
{
struct em_gio_priv *p = h->host_data;
- pr_debug("gio: map hw irq = %d, virq = %d\n", (int)hw, virq);
+ pr_debug("gio: map hw irq = %d, irq = %d\n", (int)hwirq, irq);
- irq_set_chip_data(virq, h->host_data);
- irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq);
- set_irq_flags(virq, IRQF_VALID); /* kill me now */
+ irq_set_chip_data(irq, h->host_data);
+ irq_set_chip_and_handler(irq, &p->irq_chip, handle_level_irq);
return 0;
}
-static struct irq_domain_ops em_gio_irq_domain_ops = {
+static const struct irq_domain_ops em_gio_irq_domain_ops = {
.map = em_gio_irq_domain_map,
.xlate = irq_domain_xlate_twocell,
};
+static void em_gio_irq_domain_remove(void *data)
+{
+ struct irq_domain *domain = data;
+
+ irq_domain_remove(domain);
+}
+
static int em_gio_probe(struct platform_device *pdev)
{
- struct gpio_em_config pdata_dt;
- struct gpio_em_config *pdata = pdev->dev.platform_data;
struct em_gio_priv *p;
- struct resource *io[2], *irq[2];
struct gpio_chip *gpio_chip;
struct irq_chip *irq_chip;
- const char *name = dev_name(&pdev->dev);
- int ret;
+ struct device *dev = &pdev->dev;
+ const char *name = dev_name(dev);
+ unsigned int ngpios;
+ int irq[2], ret;
- p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
- if (!p) {
- dev_err(&pdev->dev, "failed to allocate driver data\n");
- ret = -ENOMEM;
- goto err0;
- }
+ p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
p->pdev = pdev;
platform_set_drvdata(pdev, p);
spin_lock_init(&p->sense_lock);
- io[0] = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- io[1] = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- irq[0] = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
- irq[1] = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
+ irq[0] = platform_get_irq(pdev, 0);
+ if (irq[0] < 0)
+ return irq[0];
- if (!io[0] || !io[1] || !irq[0] || !irq[1]) {
- dev_err(&pdev->dev, "missing IRQ or IOMEM\n");
- ret = -EINVAL;
- goto err0;
- }
+ irq[1] = platform_get_irq(pdev, 1);
+ if (irq[1] < 0)
+ return irq[1];
- p->base0 = devm_ioremap_nocache(&pdev->dev, io[0]->start,
- resource_size(io[0]));
- if (!p->base0) {
- dev_err(&pdev->dev, "failed to remap low I/O memory\n");
- ret = -ENXIO;
- goto err0;
- }
+ p->base0 = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(p->base0))
+ return PTR_ERR(p->base0);
- p->base1 = devm_ioremap_nocache(&pdev->dev, io[1]->start,
- resource_size(io[1]));
- if (!p->base1) {
- dev_err(&pdev->dev, "failed to remap high I/O memory\n");
- ret = -ENXIO;
- goto err0;
- }
+ p->base1 = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(p->base1))
+ return PTR_ERR(p->base1);
- if (!pdata) {
- memset(&pdata_dt, 0, sizeof(pdata_dt));
- pdata = &pdata_dt;
-
- if (of_property_read_u32(pdev->dev.of_node, "ngpios",
- &pdata->number_of_pins)) {
- dev_err(&pdev->dev, "Missing ngpios OF property\n");
- ret = -EINVAL;
- goto err0;
- }
-
- ret = of_alias_get_id(pdev->dev.of_node, "gpio");
- if (ret < 0) {
- dev_err(&pdev->dev, "Couldn't get OF id\n");
- goto err0;
- }
- pdata->gpio_base = ret * 32; /* 32 GPIOs per instance */
+ if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+ dev_err(dev, "Missing ngpios OF property\n");
+ return -EINVAL;
}
gpio_chip = &p->gpio_chip;
@@ -308,67 +308,51 @@ static int em_gio_probe(struct platform_device *pdev)
gpio_chip->direction_output = em_gio_direction_output;
gpio_chip->set = em_gio_set;
gpio_chip->to_irq = em_gio_to_irq;
+ gpio_chip->request = pinctrl_gpio_request;
+ gpio_chip->free = em_gio_free;
gpio_chip->label = name;
+ gpio_chip->parent = dev;
gpio_chip->owner = THIS_MODULE;
- gpio_chip->base = pdata->gpio_base;
- gpio_chip->ngpio = pdata->number_of_pins;
+ gpio_chip->base = -1;
+ gpio_chip->ngpio = ngpios;
irq_chip = &p->irq_chip;
- irq_chip->name = name;
+ irq_chip->name = "gpio-em";
irq_chip->irq_mask = em_gio_irq_disable;
irq_chip->irq_unmask = em_gio_irq_enable;
- irq_chip->irq_enable = em_gio_irq_enable;
- irq_chip->irq_disable = em_gio_irq_disable;
irq_chip->irq_set_type = em_gio_irq_set_type;
- irq_chip->flags = IRQCHIP_SKIP_SET_WAKE;
+ irq_chip->irq_request_resources = em_gio_irq_reqres;
+ irq_chip->irq_release_resources = em_gio_irq_relres;
+ irq_chip->flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
- p->irq_domain = irq_domain_add_simple(pdev->dev.of_node,
- pdata->number_of_pins,
- pdata->irq_base,
- &em_gio_irq_domain_ops, p);
+ p->irq_domain = irq_domain_create_simple(dev_fwnode(dev), ngpios, 0,
+ &em_gio_irq_domain_ops, p);
if (!p->irq_domain) {
- ret = -ENXIO;
- dev_err(&pdev->dev, "cannot initialize irq domain\n");
- goto err0;
+ dev_err(dev, "cannot initialize irq domain\n");
+ return -ENXIO;
}
- if (devm_request_irq(&pdev->dev, irq[0]->start,
- em_gio_irq_handler, 0, name, p)) {
- dev_err(&pdev->dev, "failed to request low IRQ\n");
- ret = -ENOENT;
- goto err1;
- }
+ ret = devm_add_action_or_reset(dev, em_gio_irq_domain_remove,
+ p->irq_domain);
+ if (ret)
+ return ret;
- if (devm_request_irq(&pdev->dev, irq[1]->start,
- em_gio_irq_handler, 0, name, p)) {
- dev_err(&pdev->dev, "failed to request high IRQ\n");
- ret = -ENOENT;
- goto err1;
+ if (devm_request_irq(dev, irq[0], em_gio_irq_handler, 0, name, p)) {
+ dev_err(dev, "failed to request low IRQ\n");
+ return -ENOENT;
}
- ret = gpiochip_add(gpio_chip);
- if (ret) {
- dev_err(&pdev->dev, "failed to add GPIO controller\n");
- goto err1;
+ if (devm_request_irq(dev, irq[1], em_gio_irq_handler, 0, name, p)) {
+ dev_err(dev, "failed to request high IRQ\n");
+ return -ENOENT;
}
- return 0;
-
-err1:
- irq_domain_remove(p->irq_domain);
-err0:
- return ret;
-}
-static int em_gio_remove(struct platform_device *pdev)
-{
- struct em_gio_priv *p = platform_get_drvdata(pdev);
- int ret;
-
- ret = gpiochip_remove(&p->gpio_chip);
- if (ret)
+ ret = devm_gpiochip_add_data(dev, gpio_chip, p);
+ if (ret) {
+ dev_err(dev, "failed to add GPIO controller\n");
return ret;
+ }
- irq_domain_remove(p->irq_domain);
return 0;
}
@@ -380,11 +364,9 @@ MODULE_DEVICE_TABLE(of, em_gio_dt_ids);
static struct platform_driver em_gio_device_driver = {
.probe = em_gio_probe,
- .remove = em_gio_remove,
.driver = {
.name = "em_gio",
.of_match_table = em_gio_dt_ids,
- .owner = THIS_MODULE,
}
};
generated by cgit (git 2.34.1) at 2025-12-21 21:37:23 +0000