core generic GPIO support for Freescale Coldfire processors.

This adds the basic infrastructure used by all of the different Coldfire CPUs.

Signed-off-by: Steven King <sfking@fdwdc.com>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
This commit is contained in:
sfking@fdwdc.com 2009-06-19 18:11:00 -07:00 committed by Greg Ungerer
parent 74fca6a428
commit af39bb8b07
7 changed files with 470 additions and 0 deletions

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@ -0,0 +1,238 @@
/*
* Coldfire generic GPIO support
*
* (C) Copyright 2009, Steven King <sfking@fdwdc.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 Free Software Foundation; 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.
*/
#ifndef coldfire_gpio_h
#define coldfire_gpio_h
#include <linux/io.h>
#include <asm-generic/gpio.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
/*
* The Freescale Coldfire family is quite varied in how they implement GPIO.
* Some parts have 8 bit ports, some have 16bit and some have 32bit; some have
* only one port, others have multiple ports; some have a single data latch
* for both input and output, others have a separate pin data register to read
* input; some require a read-modify-write access to change an output, others
* have set and clear registers for some of the outputs; Some have all the
* GPIOs in a single control area, others have some GPIOs implemented in
* different modules.
*
* This implementation attempts accomodate the differences while presenting
* a generic interface that will optimize to as few instructions as possible.
*/
#if defined(CONFIG_M5206) || defined(CONFIG_M5206e) || \
defined(CONFIG_M520x) || defined(CONFIG_M523x) || \
defined(CONFIG_M527x) || defined(CONFIG_M528x) || defined(CONFIG_M532x)
/* These parts have GPIO organized by 8 bit ports */
#define MCFGPIO_PORTTYPE u8
#define MCFGPIO_PORTSIZE 8
#define mcfgpio_read(port) __raw_readb(port)
#define mcfgpio_write(data, port) __raw_writeb(data, port)
#elif defined(CONFIG_M5307) || defined(CONFIG_M5407) || defined(CONFIG_M5272)
/* These parts have GPIO organized by 16 bit ports */
#define MCFGPIO_PORTTYPE u16
#define MCFGPIO_PORTSIZE 16
#define mcfgpio_read(port) __raw_readw(port)
#define mcfgpio_write(data, port) __raw_writew(data, port)
#elif defined(CONFIG_M5249)
/* These parts have GPIO organized by 32 bit ports */
#define MCFGPIO_PORTTYPE u32
#define MCFGPIO_PORTSIZE 32
#define mcfgpio_read(port) __raw_readl(port)
#define mcfgpio_write(data, port) __raw_writel(data, port)
#endif
#define mcfgpio_bit(gpio) (1 << ((gpio) % MCFGPIO_PORTSIZE))
#define mcfgpio_port(gpio) ((gpio) / MCFGPIO_PORTSIZE)
#if defined(CONFIG_M520x) || defined(CONFIG_M523x) || \
defined(CONFIG_M527x) || defined(CONFIG_M528x) || defined(CONFIG_M532x)
/*
* These parts have an 'Edge' Port module (external interrupt/GPIO) which uses
* read-modify-write to change an output and a GPIO module which has separate
* set/clr registers to directly change outputs with a single write access.
*/
#if defined(CONFIG_M528x)
/*
* The 528x also has GPIOs in other modules (GPT, QADC) which use
* read-modify-write as well as those controlled by the EPORT and GPIO modules.
*/
#define MCFGPIO_SCR_START 40
#else
#define MCFGPIO_SCR_START 8
#endif
#define MCFGPIO_SETR_PORT(gpio) (MCFGPIO_SETR + \
mcfgpio_port(gpio - MCFGPIO_SCR_START))
#define MCFGPIO_CLRR_PORT(gpio) (MCFGPIO_CLRR + \
mcfgpio_port(gpio - MCFGPIO_SCR_START))
#else
#define MCFGPIO_SCR_START MCFGPIO_PIN_MAX
/* with MCFGPIO_SCR == MCFGPIO_PIN_MAX, these will be optimized away */
#define MCFGPIO_SETR_PORT(gpio) 0
#define MCFGPIO_CLRR_PORT(gpio) 0
#endif
/*
* Coldfire specific helper functions
*/
/* return the port pin data register for a gpio */
static inline u32 __mcf_gpio_ppdr(unsigned gpio)
{
#if defined(CONFIG_M5206) || defined(CONFIG_M5206e) || \
defined(CONFIG_M5307) || defined(CONFIG_M5407)
return MCFSIM_PADAT;
#elif defined(CONFIG_M5272)
if (gpio < 16)
return MCFSIM_PADAT;
else if (gpio < 32)
return MCFSIM_PBDAT;
else
return MCFSIM_PCDAT;
#elif defined(CONFIG_M5249)
if (gpio < 32)
return MCFSIM2_GPIOREAD;
else
return MCFSIM2_GPIO1READ;
#elif defined(CONFIG_M520x) || defined(CONFIG_M523x) || \
defined(CONFIG_M527x) || defined(CONFIG_M528x) || defined(CONFIG_M532x)
if (gpio < 8)
return MCFEPORT_EPPDR;
#if defined(CONFIG_M528x)
else if (gpio < 16)
return MCFGPTA_GPTPORT;
else if (gpio < 24)
return MCFGPTB_GPTPORT;
else if (gpio < 32)
return MCFQADC_PORTQA;
else if (gpio < 40)
return MCFQADC_PORTQB;
#endif
else
return MCFGPIO_PPDR + mcfgpio_port(gpio - MCFGPIO_SCR_START);
#endif
}
/* return the port output data register for a gpio */
static inline u32 __mcf_gpio_podr(unsigned gpio)
{
#if defined(CONFIG_M5206) || defined(CONFIG_M5206e) || \
defined(CONFIG_M5307) || defined(CONFIG_M5407)
return MCFSIM_PADAT;
#elif defined(CONFIG_M5272)
if (gpio < 16)
return MCFSIM_PADAT;
else if (gpio < 32)
return MCFSIM_PBDAT;
else
return MCFSIM_PCDAT;
#elif defined(CONFIG_M5249)
if (gpio < 32)
return MCFSIM2_GPIOWRITE;
else
return MCFSIM2_GPIO1WRITE;
#elif defined(CONFIG_M520x) || defined(CONFIG_M523x) || \
defined(CONFIG_M527x) || defined(CONFIG_M528x) || defined(CONFIG_M532x)
if (gpio < 8)
return MCFEPORT_EPDR;
#if defined(CONFIG_M528x)
else if (gpio < 16)
return MCFGPTA_GPTPORT;
else if (gpio < 24)
return MCFGPTB_GPTPORT;
else if (gpio < 32)
return MCFQADC_PORTQA;
else if (gpio < 40)
return MCFQADC_PORTQB;
#endif
else
return MCFGPIO_PODR + mcfgpio_port(gpio - MCFGPIO_SCR_START);
#endif
}
/*
* The Generic GPIO functions
*
* If the gpio is a compile time constant and is one of the Coldfire gpios,
* use the inline version, otherwise dispatch thru gpiolib.
*/
static inline int gpio_get_value(unsigned gpio)
{
if (__builtin_constant_p(gpio) && gpio < MCFGPIO_PIN_MAX)
return mcfgpio_read(__mcf_gpio_ppdr(gpio)) & mcfgpio_bit(gpio);
else
return __gpio_get_value(gpio);
}
static inline void gpio_set_value(unsigned gpio, int value)
{
if (__builtin_constant_p(gpio) && gpio < MCFGPIO_PIN_MAX) {
if (gpio < MCFGPIO_SCR_START) {
unsigned long flags;
MCFGPIO_PORTTYPE data;
local_irq_save(flags);
data = mcfgpio_read(__mcf_gpio_podr(gpio));
if (value)
data |= mcfgpio_bit(gpio);
else
data &= ~mcfgpio_bit(gpio);
mcfgpio_write(data, __mcf_gpio_podr(gpio));
local_irq_restore(flags);
} else {
if (value)
mcfgpio_write(mcfgpio_bit(gpio),
MCFGPIO_SETR_PORT(gpio));
else
mcfgpio_write(~mcfgpio_bit(gpio),
MCFGPIO_CLRR_PORT(gpio));
}
} else
__gpio_set_value(gpio, value);
}
static inline int gpio_to_irq(unsigned gpio)
{
return (gpio < MCFGPIO_IRQ_MAX) ? gpio + MCFGPIO_IRQ_VECBASE : -EINVAL;
}
static inline int irq_to_gpio(unsigned irq)
{
return (irq >= MCFGPIO_IRQ_VECBASE &&
irq < (MCFGPIO_IRQ_VECBASE + MCFGPIO_IRQ_MAX)) ?
irq - MCFGPIO_IRQ_VECBASE : -ENXIO;
}
static inline int gpio_cansleep(unsigned gpio)
{
return gpio < MCFGPIO_PIN_MAX ? 0 : __gpio_cansleep(gpio);
}
#endif

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@ -0,0 +1,40 @@
/*
* Coldfire generic GPIO support.
*
* (C) Copyright 2009, Steven King <sfking@fdwdc.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 Free Software Foundation; 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.
*/
#ifndef mcfgpio_h
#define mcfgpio_h
#include <linux/io.h>
#include <asm-generic/gpio.h>
struct mcf_gpio_chip {
struct gpio_chip gpio_chip;
void __iomem *pddr;
void __iomem *podr;
void __iomem *ppdr;
void __iomem *setr;
void __iomem *clrr;
const u8 *gpio_to_pinmux;
};
int mcf_gpio_direction_input(struct gpio_chip *, unsigned);
int mcf_gpio_get_value(struct gpio_chip *, unsigned);
int mcf_gpio_direction_output(struct gpio_chip *, unsigned, int);
void mcf_gpio_set_value(struct gpio_chip *, unsigned, int);
void mcf_gpio_set_value_fast(struct gpio_chip *, unsigned, int);
int mcf_gpio_request(struct gpio_chip *, unsigned);
void mcf_gpio_free(struct gpio_chip *, unsigned);
#endif

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/*
* Coldfire generic GPIO pinmux support.
*
* (C) Copyright 2009, Steven King <sfking@fdwdc.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 Free Software Foundation; 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.
*/
#ifndef pinmux_h
#define pinmux_h
#define MCFPINMUX_NONE -1
extern int mcf_pinmux_request(unsigned, unsigned);
extern void mcf_pinmux_release(unsigned, unsigned);
static inline int mcf_pinmux_is_valid(unsigned pinmux)
{
return pinmux != MCFPINMUX_NONE;
}
#endif

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@ -47,6 +47,10 @@ config GENERIC_FIND_NEXT_BIT
bool
default y
config GENERIC_GPIO
bool
default n
config GENERIC_HWEIGHT
bool
default y
@ -182,6 +186,8 @@ config M527x
config COLDFIRE
bool
depends on (M5206 || M5206e || M520x || M523x || M5249 || M527x || M5272 || M528x || M5307 || M532x || M5407)
select GENERIC_GPIO
select ARCH_REQUIRE_GPIOLIB
default y
config CLOCK_SET

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@ -27,4 +27,5 @@ obj-$(CONFIG_M5307) += timers.o
obj-$(CONFIG_M532x) += timers.o
obj-$(CONFIG_M5407) += timers.o
obj-y += pinmux.o gpio.o
extra-y := head.o

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/*
* Coldfire generic GPIO support.
*
* (C) Copyright 2009, Steven King <sfking@fdwdc.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 Free Software Foundation; 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.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sysdev.h>
#include <asm/gpio.h>
#include <asm/pinmux.h>
#include <asm/mcfgpio.h>
#define MCF_CHIP(chip) container_of(chip, struct mcf_gpio_chip, gpio_chip)
int mcf_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
unsigned long flags;
MCFGPIO_PORTTYPE dir;
struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
local_irq_save(flags);
dir = mcfgpio_read(mcf_chip->pddr);
dir &= ~mcfgpio_bit(chip->base + offset);
mcfgpio_write(dir, mcf_chip->pddr);
local_irq_restore(flags);
return 0;
}
int mcf_gpio_get_value(struct gpio_chip *chip, unsigned offset)
{
struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
return mcfgpio_read(mcf_chip->ppdr) & mcfgpio_bit(chip->base + offset);
}
int mcf_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
int value)
{
unsigned long flags;
MCFGPIO_PORTTYPE data;
struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
local_irq_save(flags);
/* write the value to the output latch */
data = mcfgpio_read(mcf_chip->podr);
if (value)
data |= mcfgpio_bit(chip->base + offset);
else
data &= ~mcfgpio_bit(chip->base + offset);
mcfgpio_write(data, mcf_chip->podr);
/* now set the direction to output */
data = mcfgpio_read(mcf_chip->pddr);
data |= mcfgpio_bit(chip->base + offset);
mcfgpio_write(data, mcf_chip->pddr);
local_irq_restore(flags);
return 0;
}
void mcf_gpio_set_value(struct gpio_chip *chip, unsigned offset, int value)
{
struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
unsigned long flags;
MCFGPIO_PORTTYPE data;
local_irq_save(flags);
data = mcfgpio_read(mcf_chip->podr);
if (value)
data |= mcfgpio_bit(chip->base + offset);
else
data &= ~mcfgpio_bit(chip->base + offset);
mcfgpio_write(data, mcf_chip->podr);
local_irq_restore(flags);
}
void mcf_gpio_set_value_fast(struct gpio_chip *chip, unsigned offset, int value)
{
struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
if (value)
mcfgpio_write(mcfgpio_bit(chip->base + offset), mcf_chip->setr);
else
mcfgpio_write(~mcfgpio_bit(chip->base + offset), mcf_chip->clrr);
}
int mcf_gpio_request(struct gpio_chip *chip, unsigned offset)
{
struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
return mcf_chip->gpio_to_pinmux ?
mcf_pinmux_request(mcf_chip->gpio_to_pinmux[offset], 0) : 0;
}
void mcf_gpio_free(struct gpio_chip *chip, unsigned offset)
{
struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
mcf_gpio_direction_input(chip, offset);
if (mcf_chip->gpio_to_pinmux)
mcf_pinmux_release(mcf_chip->gpio_to_pinmux[offset], 0);
}
struct sysdev_class mcf_gpio_sysclass = {
.name = "gpio",
};
static int __init mcf_gpio_sysinit(void)
{
return sysdev_class_register(&mcf_gpio_sysclass);
}
core_initcall(mcf_gpio_sysinit);

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@ -0,0 +1,28 @@
/*
* Coldfire generic GPIO pinmux support.
*
* (C) Copyright 2009, Steven King <sfking@fdwdc.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 Free Software Foundation; 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.
*
*/
#include <linux/kernel.h>
#include <asm/pinmux.h>
int mcf_pinmux_request(unsigned pinmux, unsigned func)
{
return 0;
}
void mcf_pinmux_release(unsigned pinmux, unsigned func)
{
}