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linux/arch/arm/mach-mxs/gpio.c

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/*
* 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.
*
* 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, or (at your option) any later version.
* 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <mach/mx23.h>
#include <mach/mx28.h>
#include <asm-generic/bug.h>
#include "gpio.h"
static struct mxs_gpio_port *mxs_gpio_ports;
static int gpio_table_size;
#define PINCTRL_DOUT(n) ((cpu_is_mx23() ? 0x0500 : 0x0700) + (n) * 0x10)
#define PINCTRL_DIN(n) ((cpu_is_mx23() ? 0x0600 : 0x0900) + (n) * 0x10)
#define PINCTRL_DOE(n) ((cpu_is_mx23() ? 0x0700 : 0x0b00) + (n) * 0x10)
#define PINCTRL_PIN2IRQ(n) ((cpu_is_mx23() ? 0x0800 : 0x1000) + (n) * 0x10)
#define PINCTRL_IRQEN(n) ((cpu_is_mx23() ? 0x0900 : 0x1100) + (n) * 0x10)
#define PINCTRL_IRQLEV(n) ((cpu_is_mx23() ? 0x0a00 : 0x1200) + (n) * 0x10)
#define PINCTRL_IRQPOL(n) ((cpu_is_mx23() ? 0x0b00 : 0x1300) + (n) * 0x10)
#define PINCTRL_IRQSTAT(n) ((cpu_is_mx23() ? 0x0c00 : 0x1400) + (n) * 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)
/* Note: This driver assumes 32 GPIOs are handled in one register */
static void clear_gpio_irqstatus(struct mxs_gpio_port *port, u32 index)
{
__mxs_clrl(1 << index, port->base + PINCTRL_IRQSTAT(port->id));
}
static void set_gpio_irqenable(struct mxs_gpio_port *port, u32 index,
int enable)
{
if (enable) {
__mxs_setl(1 << index, port->base + PINCTRL_IRQEN(port->id));
__mxs_setl(1 << index, port->base + PINCTRL_PIN2IRQ(port->id));
} else {
__mxs_clrl(1 << index, port->base + PINCTRL_IRQEN(port->id));
}
}
static void mxs_gpio_ack_irq(struct irq_data *d)
{
u32 gpio = irq_to_gpio(d->irq);
clear_gpio_irqstatus(&mxs_gpio_ports[gpio / 32], gpio & 0x1f);
}
static void mxs_gpio_mask_irq(struct irq_data *d)
{
u32 gpio = irq_to_gpio(d->irq);
set_gpio_irqenable(&mxs_gpio_ports[gpio / 32], gpio & 0x1f, 0);
}
static void mxs_gpio_unmask_irq(struct irq_data *d)
{
u32 gpio = irq_to_gpio(d->irq);
set_gpio_irqenable(&mxs_gpio_ports[gpio / 32], gpio & 0x1f, 1);
}
static int mxs_gpio_get(struct gpio_chip *chip, unsigned offset);
static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
{
u32 gpio = irq_to_gpio(d->irq);
u32 pin_mask = 1 << (gpio & 31);
struct mxs_gpio_port *port = &mxs_gpio_ports[gpio / 32];
void __iomem *pin_addr;
int edge;
switch (type) {
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->id);
if (edge & GPIO_INT_LEV_MASK)
__mxs_setl(pin_mask, pin_addr);
else
__mxs_clrl(pin_mask, pin_addr);
/* set polarity */
pin_addr = port->base + PINCTRL_IRQPOL(port->id);
if (edge & GPIO_INT_POL_MASK)
__mxs_setl(pin_mask, pin_addr);
else
__mxs_clrl(pin_mask, pin_addr);
clear_gpio_irqstatus(port, gpio & 0x1f);
return 0;
}
/* MXS has one interrupt *per* gpio port */
static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
{
u32 irq_stat;
struct mxs_gpio_port *port = (struct mxs_gpio_port *)irq_get_handler_data(irq);
u32 gpio_irq_no_base = port->virtual_irq_start;
desc->irq_data.chip->irq_ack(&desc->irq_data);
irq_stat = __raw_readl(port->base + PINCTRL_IRQSTAT(port->id)) &
__raw_readl(port->base + PINCTRL_IRQEN(port->id));
while (irq_stat != 0) {
int irqoffset = fls(irq_stat) - 1;
generic_handle_irq(gpio_irq_no_base + 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)
{
u32 gpio = irq_to_gpio(d->irq);
u32 gpio_idx = gpio & 0x1f;
struct mxs_gpio_port *port = &mxs_gpio_ports[gpio / 32];
if (enable) {
if (port->irq_high && (gpio_idx >= 16))
enable_irq_wake(port->irq_high);
else
enable_irq_wake(port->irq);
} else {
if (port->irq_high && (gpio_idx >= 16))
disable_irq_wake(port->irq_high);
else
disable_irq_wake(port->irq);
}
return 0;
}
static struct irq_chip gpio_irq_chip = {
.name = "mxs gpio",
.irq_ack = mxs_gpio_ack_irq,
.irq_mask = mxs_gpio_mask_irq,
.irq_unmask = mxs_gpio_unmask_irq,
.irq_set_type = mxs_gpio_set_irq_type,
.irq_set_wake = mxs_gpio_set_wake_irq,
};
static void mxs_set_gpio_direction(struct gpio_chip *chip, unsigned offset,
int dir)
{
struct mxs_gpio_port *port =
container_of(chip, struct mxs_gpio_port, chip);
void __iomem *pin_addr = port->base + PINCTRL_DOE(port->id);
if (dir)
__mxs_setl(1 << offset, pin_addr);
else
__mxs_clrl(1 << offset, pin_addr);
}
static int mxs_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct mxs_gpio_port *port =
container_of(chip, struct mxs_gpio_port, chip);
return (__raw_readl(port->base + PINCTRL_DIN(port->id)) >> offset) & 1;
}
static void mxs_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct mxs_gpio_port *port =
container_of(chip, struct mxs_gpio_port, chip);
void __iomem *pin_addr = port->base + PINCTRL_DOUT(port->id);
if (value)
__mxs_setl(1 << offset, pin_addr);
else
__mxs_clrl(1 << offset, pin_addr);
}
static int mxs_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct mxs_gpio_port *port =
container_of(chip, struct mxs_gpio_port, chip);
return port->virtual_irq_start + offset;
}
static int mxs_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
mxs_set_gpio_direction(chip, offset, 0);
return 0;
}
static int mxs_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
mxs_gpio_set(chip, offset, value);
mxs_set_gpio_direction(chip, offset, 1);
return 0;
}
int __init mxs_gpio_init(struct mxs_gpio_port *port, int cnt)
{
int i, j;
/* save for local usage */
mxs_gpio_ports = port;
gpio_table_size = cnt;
pr_info("MXS GPIO hardware\n");
for (i = 0; i < cnt; i++) {
/* disable the interrupt and clear the status */
__raw_writel(0, port[i].base + PINCTRL_PIN2IRQ(i));
__raw_writel(0, port[i].base + PINCTRL_IRQEN(i));
/* clear address has to be used to clear IRQSTAT bits */
__mxs_clrl(~0U, port[i].base + PINCTRL_IRQSTAT(i));
for (j = port[i].virtual_irq_start;
j < port[i].virtual_irq_start + 32; j++) {
irq_set_chip(j, &gpio_irq_chip);
irq_set_handler(j, handle_level_irq);
set_irq_flags(j, IRQF_VALID);
}
/* setup one handler for each entry */
irq_set_chained_handler(port[i].irq, mxs_gpio_irq_handler);
irq_set_handler_data(port[i].irq, &port[i]);
/* register gpio chip */
port[i].chip.direction_input = mxs_gpio_direction_input;
port[i].chip.direction_output = mxs_gpio_direction_output;
port[i].chip.get = mxs_gpio_get;
port[i].chip.set = mxs_gpio_set;
port[i].chip.to_irq = mxs_gpio_to_irq;
port[i].chip.base = i * 32;
port[i].chip.ngpio = 32;
/* its a serious configuration bug when it fails */
BUG_ON(gpiochip_add(&port[i].chip) < 0);
}
return 0;
}
#define MX23_GPIO_BASE MX23_IO_ADDRESS(MX23_PINCTRL_BASE_ADDR)
#define MX28_GPIO_BASE MX28_IO_ADDRESS(MX28_PINCTRL_BASE_ADDR)
#define DEFINE_MXS_GPIO_PORT(_base, _irq, _id) \
{ \
.chip.label = "gpio-" #_id, \
.id = _id, \
.irq = _irq, \
.base = _base, \
.virtual_irq_start = MXS_GPIO_IRQ_START + (_id) * 32, \
}
#ifdef CONFIG_SOC_IMX23
static struct mxs_gpio_port mx23_gpio_ports[] = {
DEFINE_MXS_GPIO_PORT(MX23_GPIO_BASE, MX23_INT_GPIO0, 0),
DEFINE_MXS_GPIO_PORT(MX23_GPIO_BASE, MX23_INT_GPIO1, 1),
DEFINE_MXS_GPIO_PORT(MX23_GPIO_BASE, MX23_INT_GPIO2, 2),
};
int __init mx23_register_gpios(void)
{
return mxs_gpio_init(mx23_gpio_ports, ARRAY_SIZE(mx23_gpio_ports));
}
#endif
#ifdef CONFIG_SOC_IMX28
static struct mxs_gpio_port mx28_gpio_ports[] = {
DEFINE_MXS_GPIO_PORT(MX28_GPIO_BASE, MX28_INT_GPIO0, 0),
DEFINE_MXS_GPIO_PORT(MX28_GPIO_BASE, MX28_INT_GPIO1, 1),
DEFINE_MXS_GPIO_PORT(MX28_GPIO_BASE, MX28_INT_GPIO2, 2),
DEFINE_MXS_GPIO_PORT(MX28_GPIO_BASE, MX28_INT_GPIO3, 3),
DEFINE_MXS_GPIO_PORT(MX28_GPIO_BASE, MX28_INT_GPIO4, 4),
};
int __init mx28_register_gpios(void)
{
return mxs_gpio_init(mx28_gpio_ports, ARRAY_SIZE(mx28_gpio_ports));
}
#endif
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