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linux-next/drivers/gpio/gpio-mxs.c
Uwe Kleine-König f0df462f3a gpio: mxs: read pin level directly instead of using .get 
Calling readl directly instead of going through another function that
results in the same result to remove some overhead. I didn't try to
measure the performance gain, but IMHO there is little benefit from
abstracting a GPIO register access in the GPIO driver.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2018-12-21 11:29:57 +01:00

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// SPDX-License-Identifier: GPL-2.0+
//
// MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
// Copyright 2008 Juergen Beisert, kernel@pengutronix.de
//
// Based on code from Freescale,
// Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/gpio/driver.h>
#include <linux/module.h>
#define MXS_SET 0x4
#define MXS_CLR 0x8
#define PINCTRL_DOUT(p) ((is_imx23_gpio(p) ? 0x0500 : 0x0700) + (p->id) * 0x10)
#define PINCTRL_DIN(p) ((is_imx23_gpio(p) ? 0x0600 : 0x0900) + (p->id) * 0x10)
#define PINCTRL_DOE(p) ((is_imx23_gpio(p) ? 0x0700 : 0x0b00) + (p->id) * 0x10)
#define PINCTRL_PIN2IRQ(p) ((is_imx23_gpio(p) ? 0x0800 : 0x1000) + (p->id) * 0x10)
#define PINCTRL_IRQEN(p) ((is_imx23_gpio(p) ? 0x0900 : 0x1100) + (p->id) * 0x10)
#define PINCTRL_IRQLEV(p) ((is_imx23_gpio(p) ? 0x0a00 : 0x1200) + (p->id) * 0x10)
#define PINCTRL_IRQPOL(p) ((is_imx23_gpio(p) ? 0x0b00 : 0x1300) + (p->id) * 0x10)
#define PINCTRL_IRQSTAT(p) ((is_imx23_gpio(p) ? 0x0c00 : 0x1400) + (p->id) * 0x10)
#define GPIO_INT_FALL_EDGE 0x0
#define GPIO_INT_LOW_LEV 0x1
#define GPIO_INT_RISE_EDGE 0x2
#define GPIO_INT_HIGH_LEV 0x3
#define GPIO_INT_LEV_MASK (1 << 0)
#define GPIO_INT_POL_MASK (1 << 1)
enum mxs_gpio_id {
IMX23_GPIO,
IMX28_GPIO,
};
struct mxs_gpio_port {
void __iomem *base;
int id;
int irq;
struct irq_domain *domain;
struct gpio_chip gc;
struct device *dev;
enum mxs_gpio_id devid;
u32 both_edges;
};
static inline int is_imx23_gpio(struct mxs_gpio_port *port)
{
return port->devid == IMX23_GPIO;
}
static inline int is_imx28_gpio(struct mxs_gpio_port *port)
{
return port->devid == IMX28_GPIO;
}
/* Note: This driver assumes 32 GPIOs are handled in one register */
static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
{
u32 val;
u32 pin_mask = 1 << d->hwirq;
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
struct mxs_gpio_port *port = gc->private;
void __iomem *pin_addr;
int edge;
if (!(ct->type & type))
if (irq_setup_alt_chip(d, type))
return -EINVAL;
port->both_edges &= ~pin_mask;
switch (type) {
case IRQ_TYPE_EDGE_BOTH:
val = readl(port->base + PINCTRL_DIN(port)) & pin_mask;
if (val)
edge = GPIO_INT_FALL_EDGE;
else
edge = GPIO_INT_RISE_EDGE;
port->both_edges |= pin_mask;
break;
case IRQ_TYPE_EDGE_RISING:
edge = GPIO_INT_RISE_EDGE;
break;
case IRQ_TYPE_EDGE_FALLING:
edge = GPIO_INT_FALL_EDGE;
break;
case IRQ_TYPE_LEVEL_LOW:
edge = GPIO_INT_LOW_LEV;
break;
case IRQ_TYPE_LEVEL_HIGH:
edge = GPIO_INT_HIGH_LEV;
break;
default:
return -EINVAL;
}
/* set level or edge */
pin_addr = port->base + PINCTRL_IRQLEV(port);
if (edge & GPIO_INT_LEV_MASK) {
writel(pin_mask, pin_addr + MXS_SET);
writel(pin_mask, port->base + PINCTRL_IRQEN(port) + MXS_SET);
} else {
writel(pin_mask, pin_addr + MXS_CLR);
writel(pin_mask, port->base + PINCTRL_PIN2IRQ(port) + MXS_SET);
}
/* set polarity */
pin_addr = port->base + PINCTRL_IRQPOL(port);
if (edge & GPIO_INT_POL_MASK)
writel(pin_mask, pin_addr + MXS_SET);
else
writel(pin_mask, pin_addr + MXS_CLR);
writel(pin_mask, port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
return 0;
}
static void mxs_flip_edge(struct mxs_gpio_port *port, u32 gpio)
{
u32 bit, val, edge;
void __iomem *pin_addr;
bit = 1 << gpio;
pin_addr = port->base + PINCTRL_IRQPOL(port);
val = readl(pin_addr);
edge = val & bit;
if (edge)
writel(bit, pin_addr + MXS_CLR);
else
writel(bit, pin_addr + MXS_SET);
}
/* MXS has one interrupt *per* gpio port */
static void mxs_gpio_irq_handler(struct irq_desc *desc)
{
u32 irq_stat;
struct mxs_gpio_port *port = irq_desc_get_handler_data(desc);
desc->irq_data.chip->irq_ack(&desc->irq_data);
irq_stat = readl(port->base + PINCTRL_IRQSTAT(port)) &
readl(port->base + PINCTRL_IRQEN(port));
while (irq_stat != 0) {
int irqoffset = fls(irq_stat) - 1;
if (port->both_edges & (1 << irqoffset))
mxs_flip_edge(port, irqoffset);
generic_handle_irq(irq_find_mapping(port->domain, irqoffset));
irq_stat &= ~(1 << irqoffset);
}
}
/*
* Set interrupt number "irq" in the GPIO as a wake-up source.
* While system is running, all registered GPIO interrupts need to have
* wake-up enabled. When system is suspended, only selected GPIO interrupts
* need to have wake-up enabled.
* @param irq interrupt source number
* @param enable enable as wake-up if equal to non-zero
* @return This function returns 0 on success.
*/
static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct mxs_gpio_port *port = gc->private;
if (enable)
enable_irq_wake(port->irq);
else
disable_irq_wake(port->irq);
return 0;
}
static int mxs_gpio_init_gc(struct mxs_gpio_port *port, int irq_base)
{
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
int rv;
gc = devm_irq_alloc_generic_chip(port->dev, "gpio-mxs", 2, irq_base,
port->base, handle_level_irq);
if (!gc)
return -ENOMEM;
gc->private = port;
ct = &gc->chip_types[0];
ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
ct->chip.irq_ack = irq_gc_ack_set_bit;
ct->chip.irq_mask = irq_gc_mask_disable_reg;
ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
ct->chip.irq_set_type = mxs_gpio_set_irq_type;
ct->chip.irq_set_wake = mxs_gpio_set_wake_irq;
ct->chip.flags = IRQCHIP_SET_TYPE_MASKED;
ct->regs.ack = PINCTRL_IRQSTAT(port) + MXS_CLR;
ct->regs.enable = PINCTRL_PIN2IRQ(port) + MXS_SET;
ct->regs.disable = PINCTRL_PIN2IRQ(port) + MXS_CLR;
ct = &gc->chip_types[1];
ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
ct->chip.irq_ack = irq_gc_ack_set_bit;
ct->chip.irq_mask = irq_gc_mask_disable_reg;
ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
ct->chip.irq_set_type = mxs_gpio_set_irq_type;
ct->chip.irq_set_wake = mxs_gpio_set_wake_irq;
ct->chip.flags = IRQCHIP_SET_TYPE_MASKED;
ct->regs.ack = PINCTRL_IRQSTAT(port) + MXS_CLR;
ct->regs.enable = PINCTRL_IRQEN(port) + MXS_SET;
ct->regs.disable = PINCTRL_IRQEN(port) + MXS_CLR;
ct->handler = handle_level_irq;
rv = devm_irq_setup_generic_chip(port->dev, gc, IRQ_MSK(32),
IRQ_GC_INIT_NESTED_LOCK,
IRQ_NOREQUEST, 0);
return rv;
}
static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
{
struct mxs_gpio_port *port = gpiochip_get_data(gc);
return irq_find_mapping(port->domain, offset);
}
static int mxs_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
{
struct mxs_gpio_port *port = gpiochip_get_data(gc);
u32 mask = 1 << offset;
u32 dir;
dir = readl(port->base + PINCTRL_DOE(port));
return !(dir & mask);
}
static const struct platform_device_id mxs_gpio_ids[] = {
{
.name = "imx23-gpio",
.driver_data = IMX23_GPIO,
}, {
.name = "imx28-gpio",
.driver_data = IMX28_GPIO,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(platform, mxs_gpio_ids);
static const struct of_device_id mxs_gpio_dt_ids[] = {
{ .compatible = "fsl,imx23-gpio", .data = (void *) IMX23_GPIO, },
{ .compatible = "fsl,imx28-gpio", .data = (void *) IMX28_GPIO, },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxs_gpio_dt_ids);
static int mxs_gpio_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device_node *parent;
static void __iomem *base;
struct mxs_gpio_port *port;
int irq_base;
int err;
port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
if (!port)
return -ENOMEM;
port->id = of_alias_get_id(np, "gpio");
if (port->id < 0)
return port->id;
port->devid = (enum mxs_gpio_id)of_device_get_match_data(&pdev->dev);
port->dev = &pdev->dev;
port->irq = platform_get_irq(pdev, 0);
if (port->irq < 0)
return port->irq;
/*
* map memory region only once, as all the gpio ports
* share the same one
*/
if (!base) {
parent = of_get_parent(np);
base = of_iomap(parent, 0);
of_node_put(parent);
if (!base)
return -EADDRNOTAVAIL;
}
port->base = base;
/* initially disable the interrupts */
writel(0, port->base + PINCTRL_PIN2IRQ(port));
writel(0, port->base + PINCTRL_IRQEN(port));
/* clear address has to be used to clear IRQSTAT bits */
writel(~0U, port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0, 32, numa_node_id());
if (irq_base < 0) {
err = irq_base;
goto out_iounmap;
}
port->domain = irq_domain_add_legacy(np, 32, irq_base, 0,
&irq_domain_simple_ops, NULL);
if (!port->domain) {
err = -ENODEV;
goto out_iounmap;
}
/* gpio-mxs can be a generic irq chip */
err = mxs_gpio_init_gc(port, irq_base);
if (err < 0)
goto out_irqdomain_remove;
/* setup one handler for each entry */
irq_set_chained_handler_and_data(port->irq, mxs_gpio_irq_handler,
port);
err = bgpio_init(&port->gc, &pdev->dev, 4,
port->base + PINCTRL_DIN(port),
port->base + PINCTRL_DOUT(port) + MXS_SET,
port->base + PINCTRL_DOUT(port) + MXS_CLR,
port->base + PINCTRL_DOE(port), NULL, 0);
if (err)
goto out_irqdomain_remove;
port->gc.to_irq = mxs_gpio_to_irq;
port->gc.get_direction = mxs_gpio_get_direction;
port->gc.base = port->id * 32;
err = gpiochip_add_data(&port->gc, port);
if (err)
goto out_irqdomain_remove;
return 0;
out_irqdomain_remove:
irq_domain_remove(port->domain);
out_iounmap:
iounmap(port->base);
return err;
}
static struct platform_driver mxs_gpio_driver = {
.driver = {
.name = "gpio-mxs",
.of_match_table = mxs_gpio_dt_ids,
.suppress_bind_attrs = true,
},
.probe = mxs_gpio_probe,
.id_table = mxs_gpio_ids,
};
static int __init mxs_gpio_init(void)
{
return platform_driver_register(&mxs_gpio_driver);
}
postcore_initcall(mxs_gpio_init);
MODULE_AUTHOR("Freescale Semiconductor, "
"Daniel Mack <danielncaiaq.de>, "
"Juergen Beisert <kernel@pengutronix.de>");
MODULE_DESCRIPTION("Freescale MXS GPIO");
MODULE_LICENSE("GPL");
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