WSL2-Linux-Kernel/drivers/gpio/gpio-em.c

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C
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Emma Mobile GPIO Support - GIO
*
* Copyright (C) 2012 Magnus Damm
*/
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pinctrl/consumer.h>
struct em_gio_priv {
void __iomem *base0;
void __iomem *base1;
spinlock_t sense_lock;
struct platform_device *pdev;
struct gpio_chip gpio_chip;
struct irq_chip irq_chip;
struct irq_domain *irq_domain;
};
#define GIO_E1 0x00
#define GIO_E0 0x04
#define GIO_EM 0x04
#define GIO_OL 0x08
#define GIO_OH 0x0c
#define GIO_I 0x10
#define GIO_IIA 0x14
#define GIO_IEN 0x18
#define GIO_IDS 0x1c
#define GIO_IIM 0x1c
#define GIO_RAW 0x20
#define GIO_MST 0x24
#define GIO_IIR 0x28
#define GIO_IDT0 0x40
#define GIO_IDT1 0x44
#define GIO_IDT2 0x48
#define GIO_IDT3 0x4c
#define GIO_RAWBL 0x50
#define GIO_RAWBH 0x54
#define GIO_IRBL 0x58
#define GIO_IRBH 0x5c
#define GIO_IDT(n) (GIO_IDT0 + ((n) * 4))
static inline unsigned long em_gio_read(struct em_gio_priv *p, int offs)
{
if (offs < GIO_IDT0)
return ioread32(p->base0 + offs);
else
return ioread32(p->base1 + (offs - GIO_IDT0));
}
static inline void em_gio_write(struct em_gio_priv *p, int offs,
unsigned long value)
{
if (offs < GIO_IDT0)
iowrite32(value, p->base0 + offs);
else
iowrite32(value, p->base1 + (offs - GIO_IDT0));
}
static void em_gio_irq_disable(struct irq_data *d)
{
struct em_gio_priv *p = irq_data_get_irq_chip_data(d);
em_gio_write(p, GIO_IDS, BIT(irqd_to_hwirq(d)));
}
static void em_gio_irq_enable(struct irq_data *d)
{
struct em_gio_priv *p = irq_data_get_irq_chip_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) {
gpio: change member .dev to .parent The name .dev in a struct is normally reserved for a struct device that is let us say a superclass to the thing described by the struct. struct gpio_chip stands out by confusingly using a struct device *dev to point to the parent device (such as a platform_device) that represents the hardware. As we want to give gpio_chip:s real devices, this is not working. We need to rename this member to parent. This was done by two coccinelle scripts, I guess it is possible to combine them into one, but I don't know such stuff. They look like this: @@ struct gpio_chip *var; @@ -var->dev +var->parent and: @@ struct gpio_chip var; @@ -var.dev +var.parent and: @@ struct bgpio_chip *var; @@ -var->gc.dev +var->gc.parent Plus a few instances of bgpio that I couldn't figure out how to teach Coccinelle to rewrite. This patch hits all over the place, but I *strongly* prefer this solution to any piecemal approaches that just exercise patch mechanics all over the place. It mainly hits drivers/gpio and drivers/pinctrl which is my own backyard anyway. Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Rafał Miłecki <zajec5@gmail.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com> Cc: Alek Du <alek.du@intel.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Jiri Kosina <jkosina@suse.cz> Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no> Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-11-04 11:56:26 +03:00
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] = {
[IRQ_TYPE_EDGE_RISING] = GIO_ASYNC(0x00),
[IRQ_TYPE_EDGE_FALLING] = GIO_ASYNC(0x01),
[IRQ_TYPE_LEVEL_HIGH] = GIO_ASYNC(0x02),
[IRQ_TYPE_LEVEL_LOW] = GIO_ASYNC(0x03),
[IRQ_TYPE_EDGE_BOTH] = GIO_ASYNC(0x04),
};
static int em_gio_irq_set_type(struct irq_data *d, unsigned int type)
{
unsigned char value = em_gio_sense_table[type & IRQ_TYPE_SENSE_MASK];
struct em_gio_priv *p = irq_data_get_irq_chip_data(d);
unsigned int reg, offset, shift;
unsigned long flags;
unsigned long tmp;
if (!value)
return -EINVAL;
offset = irqd_to_hwirq(d);
pr_debug("gio: sense irq = %d, mode = %d\n", offset, value);
/* 8 x 4 bit fields in 4 IDT registers */
reg = GIO_IDT(offset >> 3);
shift = (offset & 0x07) << 4;
spin_lock_irqsave(&p->sense_lock, flags);
/* disable the interrupt in IIA */
tmp = em_gio_read(p, GIO_IIA);
tmp &= ~BIT(offset);
em_gio_write(p, GIO_IIA, tmp);
/* change the sense setting in IDT */
tmp = em_gio_read(p, reg);
tmp &= ~(0xf << shift);
tmp |= value << shift;
em_gio_write(p, reg, tmp);
/* clear pending interrupts */
em_gio_write(p, GIO_IIR, BIT(offset));
/* enable the interrupt in IIA */
tmp = em_gio_read(p, GIO_IIA);
tmp |= BIT(offset);
em_gio_write(p, GIO_IIA, tmp);
spin_unlock_irqrestore(&p->sense_lock, flags);
return 0;
}
static irqreturn_t em_gio_irq_handler(int irq, void *dev_id)
{
struct em_gio_priv *p = dev_id;
unsigned long pending;
unsigned int offset, irqs_handled = 0;
while ((pending = em_gio_read(p, GIO_MST))) {
offset = __ffs(pending);
em_gio_write(p, GIO_IIR, BIT(offset));
generic_handle_domain_irq(p->irq_domain, offset);
irqs_handled++;
}
return irqs_handled ? IRQ_HANDLED : IRQ_NONE;
}
static inline struct em_gio_priv *gpio_to_priv(struct gpio_chip *chip)
{
return gpiochip_get_data(chip);
}
static int em_gio_direction_input(struct gpio_chip *chip, unsigned offset)
{
em_gio_write(gpio_to_priv(chip), GIO_E0, BIT(offset));
return 0;
}
static int em_gio_get(struct gpio_chip *chip, unsigned 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,
unsigned shift, int value)
{
/* upper 16 bits contains mask and lower 16 actual value */
em_gio_write(gpio_to_priv(chip), reg,
(BIT(shift + 16)) | (value << shift));
}
static void em_gio_set(struct gpio_chip *chip, unsigned 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);
}
static int em_gio_direction_output(struct gpio_chip *chip, unsigned offset,
int value)
{
/* write GPIO value to output before selecting output mode of pin */
em_gio_set(chip, offset, value);
em_gio_write(gpio_to_priv(chip), GIO_E1, BIT(offset));
return 0;
}
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_request(struct gpio_chip *chip, unsigned offset)
{
return pinctrl_gpio_request(chip->base + offset);
}
static void em_gio_free(struct gpio_chip *chip, unsigned offset)
{
pinctrl_gpio_free(chip->base + 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, irq = %d\n", (int)hwirq, irq);
irq_set_chip_data(irq, h->host_data);
irq_set_chip_and_handler(irq, &p->irq_chip, handle_level_irq);
return 0;
}
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 em_gio_priv *p;
struct gpio_chip *gpio_chip;
struct irq_chip *irq_chip;
struct device *dev = &pdev->dev;
const char *name = dev_name(dev);
unsigned int ngpios;
int irq[2], ret;
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);
irq[0] = platform_get_irq(pdev, 0);
if (irq[0] < 0)
return irq[0];
irq[1] = platform_get_irq(pdev, 1);
if (irq[1] < 0)
return irq[1];
p->base0 = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(p->base0))
return PTR_ERR(p->base0);
p->base1 = devm_platform_ioremap_resource(pdev, 1);
if (IS_ERR(p->base1))
return PTR_ERR(p->base1);
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;
gpio_chip->of_node = dev->of_node;
gpio_chip->direction_input = em_gio_direction_input;
gpio_chip->get = em_gio_get;
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 = em_gio_request;
gpio_chip->free = em_gio_free;
gpio_chip->label = name;
gpio_chip->parent = dev;
gpio_chip->owner = THIS_MODULE;
gpio_chip->base = -1;
gpio_chip->ngpio = ngpios;
irq_chip = &p->irq_chip;
irq_chip->name = "gpio-em";
irq_chip->irq_mask = em_gio_irq_disable;
irq_chip->irq_unmask = em_gio_irq_enable;
irq_chip->irq_set_type = em_gio_irq_set_type;
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(dev->of_node, ngpios, 0,
&em_gio_irq_domain_ops, p);
gpio: em: Fix build errors Fix below build errors: CC [M] drivers/gpio/gpio-em.o drivers/gpio/gpio-em.c: In function 'em_gio_probe': drivers/gpio/gpio-em.c:306: error: 'err' undeclared (first use in this function) drivers/gpio/gpio-em.c:306: error: (Each undeclared identifier is reported only once drivers/gpio/gpio-em.c:306: error: for each function it appears in.) drivers/gpio/gpio-em.c:308: error: label 'err3' used but not defined drivers/gpio/gpio-em.c:279: error: label 'err2' used but not defined drivers/gpio/gpio-em.c:265: error: label 'err1' used but not defined drivers/gpio/gpio-em.c:250: error: label 'err0' used but not defined drivers/gpio/gpio-em.c:309: warning: no return statement in function returning non-void drivers/gpio/gpio-em.c: At top level: drivers/gpio/gpio-em.c:311: error: expected identifier or '(' before 'if' drivers/gpio/gpio-em.c:317: error: expected identifier or '(' before 'if' drivers/gpio/gpio-em.c:323: warning: data definition has no type or storage class drivers/gpio/gpio-em.c:323: warning: type defaults to 'int' in declaration of 'ret' drivers/gpio/gpio-em.c:323: error: 'gpio_chip' undeclared here (not in a function) drivers/gpio/gpio-em.c:323: error: initializer element is not constant drivers/gpio/gpio-em.c:324: error: expected identifier or '(' before 'if' drivers/gpio/gpio-em.c:328: error: expected identifier or '(' before 'return' drivers/gpio/gpio-em.c:330: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token drivers/gpio/gpio-em.c:332: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token drivers/gpio/gpio-em.c:334: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token drivers/gpio/gpio-em.c:336: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token drivers/gpio/gpio-em.c:338: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token drivers/gpio/gpio-em.c:340: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token drivers/gpio/gpio-em.c:342: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token drivers/gpio/gpio-em.c:344: error: expected identifier or '(' before '}' token drivers/gpio/gpio-em.c: In function 'em_gio_remove': drivers/gpio/gpio-em.c:361: error: implicit declaration of function 'em_gio_irq_domain_cleanup' make[2]: *** [drivers/gpio/gpio-em.o] Error 1 make[1]: *** [drivers/gpio] Error 2 make: *** [drivers] Error 2 Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-10-31 13:03:33 +04:00
if (!p->irq_domain) {
dev_err(dev, "cannot initialize irq domain\n");
return -ENXIO;
}
ret = devm_add_action_or_reset(dev, em_gio_irq_domain_remove,
p->irq_domain);
if (ret)
return ret;
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;
}
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;
}
ret = devm_gpiochip_add_data(dev, gpio_chip, p);
if (ret) {
dev_err(dev, "failed to add GPIO controller\n");
return ret;
}
return 0;
}
static const struct of_device_id em_gio_dt_ids[] = {
{ .compatible = "renesas,em-gio", },
{},
};
MODULE_DEVICE_TABLE(of, em_gio_dt_ids);
static struct platform_driver em_gio_device_driver = {
.probe = em_gio_probe,
.driver = {
.name = "em_gio",
.of_match_table = em_gio_dt_ids,
}
};
static int __init em_gio_init(void)
{
return platform_driver_register(&em_gio_device_driver);
}
postcore_initcall(em_gio_init);
static void __exit em_gio_exit(void)
{
platform_driver_unregister(&em_gio_device_driver);
}
module_exit(em_gio_exit);
MODULE_AUTHOR("Magnus Damm");
MODULE_DESCRIPTION("Renesas Emma Mobile GIO Driver");
MODULE_LICENSE("GPL v2");