239 lines
6.8 KiB
C
239 lines
6.8 KiB
C
/*
|
|
* 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
|