rt-thread/bsp/fh8620/drivers/gpio.c

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/*
* This file is part of FH8620 BSP for RT-Thread distribution.
*
* Copyright (c) 2016 Shanghai Fullhan Microelectronics Co., Ltd.
* 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.
*
* Visit http://www.fullhan.com to get contact with Fullhan.
*
* Change Logs:
* Date Author Notes
*/
#include "fh_def.h"
#include "gpio.h"
#include "Libraries/inc/fh_gpio.h"
#include "interrupt.h"
#include "board_info.h"
#include <rtdevice.h>
#include "fh_arch.h"
//#define FH_GPIO_DEBUG
#ifdef FH_GPIO_DEBUG
#define PRINT_GPIO_DBG(fmt, args...) \
do \
{ \
rt_kprintf("FH_GPIO_DEBUG: "); \
rt_kprintf(fmt, ## args); \
} \
while(0)
#else
#define PRINT_GPIO_DBG(fmt, args...) do { } while (0)
#endif
int gpio_available[NUM_OF_GPIO];
extern struct rt_irq_desc irq_desc[];
static inline rt_uint32_t gpio_to_base(rt_uint32_t gpio)
{
if (gpio >= 32 && gpio < 64)
{
return GPIO1_REG_BASE;
}
else if(gpio < 32)
{
return GPIO0_REG_BASE;
}
else
{
rt_kprintf("ERROR: %s, incorrect GPIO num\n", __func__);
return -RT_ERROR;
}
}
static inline rt_uint32_t irq_to_base(rt_uint32_t irq)
{
return (irq-NR_INTERNAL_IRQS > 32) ? GPIO1_REG_BASE : GPIO0_REG_BASE;
}
static inline rt_uint32_t irq_to_bit(rt_uint32_t irq)
{
if(irq >= NR_INTERNAL_IRQS && irq < NR_INTERNAL_IRQS + 32)
return 0;
else
return 32;
}
rt_uint32_t gpio_to_irq(rt_uint32_t gpio)
{
return (gpio + NR_INTERNAL_IRQS);
}
void gpio_enable_debounce(rt_uint32_t gpio)
{
rt_uint32_t tmp, base, offset;
offset = gpio % 32;
base = gpio_to_base(gpio);
tmp = GET_REG(base + REG_GPIO_DEBOUNCE);
tmp |= BIT(offset);
SET_REG(base + REG_GPIO_DEBOUNCE, tmp);
}
void gpio_disable_debounce(rt_uint32_t gpio)
{
rt_uint32_t tmp, base, offset;
offset = gpio % 32;
base = gpio_to_base(gpio);
tmp = GET_REG(base + REG_GPIO_DEBOUNCE);
tmp &= ~BIT(offset);
SET_REG(base + REG_GPIO_DEBOUNCE, tmp);
}
int gpio_get_value(rt_uint32_t gpio)
{
rt_uint32_t tmp, base, offset;
offset = gpio % 32;
base = gpio_to_base(gpio);
tmp = GET_REG(base + REG_GPIO_SWPORTA_DDR);
tmp &= BIT(offset);
if (tmp) {
tmp = GET_REG(base + REG_GPIO_SWPORTA_DR);
} else {
tmp = GET_REG(base + REG_GPIO_EXT_PORTA);
}
tmp &= BIT(offset);
tmp = tmp >> offset;
return tmp;
}
void gpio_set_value(rt_uint32_t gpio, int val)
{
rt_uint32_t tmp, base, offset;
offset = gpio % 32;
base = gpio_to_base(gpio);
tmp = GET_REG(base + REG_GPIO_SWPORTA_DR);
if(val)
tmp |= BIT(offset);
else
tmp &= ~BIT(offset);
SET_REG(base + REG_GPIO_SWPORTA_DR, tmp);
}
int gpio_get_direction(rt_uint32_t gpio)
{
rt_uint32_t tmp, base, offset;
offset = gpio % 32;
base = gpio_to_base(gpio);
tmp = GET_REG(base + REG_GPIO_SWPORTA_DDR);
tmp &= BIT(offset);
tmp = tmp >> offset;
return tmp;
}
void gpio_set_direction(rt_uint32_t gpio, rt_uint32_t direction)
{
rt_uint32_t tmp, base, offset;
offset = gpio % 32;
base = gpio_to_base(gpio);
tmp = GET_REG(base + REG_GPIO_SWPORTA_DDR);
if(direction == GPIO_DIR_OUTPUT)
tmp |= BIT(offset);
else
tmp &= ~BIT(offset);
SET_REG(base + REG_GPIO_SWPORTA_DDR, tmp);
}
int gpio_set_irq_type(rt_uint32_t gpio, rt_uint32_t type)
{
rt_uint32_t int_type, int_polarity;
rt_uint32_t bit = gpio % 32;
rt_uint32_t base;
base = gpio_to_base(gpio);
int_type = GET_REG(base + REG_GPIO_INTTYPE_LEVEL);
int_polarity = GET_REG(base + REG_GPIO_INT_POLARITY);
switch (type & IRQ_TYPE_TRIGGER_MASK) {
case IRQ_TYPE_EDGE_BOTH:
int_type |= BIT(bit);
// toggle trigger
if (gpio_get_value(gpio))
int_polarity &= ~BIT(bit);
else
int_polarity |= BIT(bit);
break;
case IRQ_TYPE_EDGE_RISING:
int_type |= BIT(bit);
int_polarity |= BIT(bit);
break;
case IRQ_TYPE_EDGE_FALLING:
int_type |= BIT(bit);
int_polarity &= ~BIT(bit);
break;
case IRQ_TYPE_LEVEL_HIGH:
int_type &= ~BIT(bit);
int_polarity |= BIT(bit);
break;
case IRQ_TYPE_LEVEL_LOW:
int_type &= ~BIT(bit);
int_polarity &= ~BIT(bit);
break;
case IRQ_TYPE_NONE:
return 0;
default:
return -RT_ERROR;
}
SET_REG(base + REG_GPIO_INTTYPE_LEVEL, int_type);
SET_REG(base + REG_GPIO_INT_POLARITY, int_polarity);
return 0;
}
int gpio_irq_mask(rt_uint32_t irq)
{
rt_uint32_t tmp, base, bit;
base = irq_to_base(irq);
bit = irq_to_bit(irq);
tmp = GET_REG(base + REG_GPIO_INTMASK);
tmp |= BIT(irq - NR_INTERNAL_IRQS - bit);
SET_REG(base + REG_GPIO_INTMASK, tmp);
return 0;
}
int gpio_irq_unmask(rt_uint32_t irq)
{
rt_uint32_t tmp, base, bit;
base = irq_to_base(irq);
bit = irq_to_bit(irq);
tmp = GET_REG(base + REG_GPIO_INTMASK);
tmp &= ~BIT((irq - NR_INTERNAL_IRQS - bit));
SET_REG(base + REG_GPIO_INTMASK, tmp);
return 0;
}
void gpio_irq_enable(rt_uint32_t irq)
{
rt_uint32_t tmp, base, bit;
base = irq_to_base(irq);
bit = irq_to_bit(irq);
tmp = GET_REG(base + REG_GPIO_INTEN);
tmp |= BIT(irq - NR_INTERNAL_IRQS - bit);
SET_REG(base + REG_GPIO_INTEN, tmp);
}
void gpio_irq_disable(rt_uint32_t irq)
{
rt_uint32_t tmp, base, bit;
base = irq_to_base(irq);
bit = irq_to_bit(irq);
tmp = GET_REG(base + REG_GPIO_INTEN);
tmp &= ~BIT((irq - NR_INTERNAL_IRQS - bit));
SET_REG(base + REG_GPIO_INTEN, tmp);
}
static void fh_gpio_interrupt(int irq, void *param)
{
rt_uint32_t irq_status;
int gpio_num, gpio;
rt_uint32_t base;
struct fh_gpio_obj *gpio_obj = (struct fh_gpio_obj *)param;
//rt_kprintf("fh_gpio_interrupt start\n");
//fixme: spin lock???
base = (irq==40) ? GPIO0_REG_BASE : GPIO1_REG_BASE;
irq_status = GET_REG(base + REG_GPIO_INTSTATUS);
if (irq_status == 0) {
rt_kprintf("gpio irq status is zero.\n");
return;
}
/* temporarily mask (level sensitive) parent IRQ */
gpio_irq_mask(irq);
gpio_num = __rt_ffs(irq_status) - 1;
SET_REG(base + REG_GPIO_PORTA_EOI, BIT(gpio_num));
gpio = gpio_num + ((irq==40) ? 0 : 32);
//generic_handle_irq(gpio_to_irq(gpio));
if(irq_desc[gpio_to_irq(gpio)].handler)
irq_desc[gpio_to_irq(gpio)].handler(gpio_to_irq(gpio), irq_desc[gpio_to_irq(gpio)].param);
gpio_irq_mask(irq);
/* now it may re-trigger */
}
int gpio_direction_input(rt_uint32_t gpio)
{
rt_uint32_t reg, base;
if(gpio > NUM_OF_GPIO)
{
rt_kprintf("ERROR: %s, incorrect GPIO num\n", __func__);
return -RT_ERROR;
}
if(!gpio_available[gpio])
{
rt_kprintf("ERROR: %s, GPIO %d is not available\n", __func__, gpio);
return -RT_EBUSY;
}
base = gpio_to_base(gpio);
gpio = gpio % 32;
//fixme: lock
//spin_lock_irqsave(&chip->lock, flags);
reg = GET_REG(base + REG_GPIO_SWPORTA_DDR);
reg &= ~(1 << gpio);
SET_REG(base + REG_GPIO_SWPORTA_DDR, reg);
//spin_unlock_irqrestore(&chip->lock, flags);
return 0;
}
int gpio_direction_output(rt_uint32_t gpio, rt_uint32_t val)
{
rt_uint32_t reg, base;
if(gpio > NUM_OF_GPIO)
{
rt_kprintf("ERROR: %s, incorrect GPIO num\n", __func__);
return -RT_ERROR;
}
if(!gpio_available[gpio])
{
rt_kprintf("ERROR: %s, GPIO %d is not available\n", __func__, gpio);
return -RT_EBUSY;
}
base = gpio_to_base(gpio);
gpio = gpio % 32;
//fixme: lock
//spin_lock_irqsave(&chip->lock, flags);
reg = GET_REG(base + REG_GPIO_SWPORTA_DDR);
reg |= (1 << gpio);
SET_REG(base + REG_GPIO_SWPORTA_DDR, reg);
reg = GET_REG(base + REG_GPIO_SWPORTA_DR);
if(val)
reg |= (1 << gpio);
else
reg &= ~(1 << gpio);
SET_REG(base + REG_GPIO_SWPORTA_DR, reg);
//spin_unlock_irqrestore(&chip->lock, flags);
return 0;
}
int gpio_request(rt_uint32_t gpio)
{
if(gpio > NUM_OF_GPIO)
{
rt_kprintf("ERROR: %s, incorrect GPIO num\n", __func__);
return -RT_ERROR;
}
gpio_available[gpio] = 1;
return 0;
}
int gpio_release(rt_uint32_t gpio)
{
if(gpio > NUM_OF_GPIO)
{
rt_kprintf("ERROR: %s, incorrect GPIO num\n", __func__);
return -RT_ERROR;
}
gpio_available[gpio] = 0;
return 0;
}
int fh_gpio_probe(void *priv_data)
{
struct fh_gpio_obj *gpio_obj = (struct fh_gpio_obj *)priv_data;
int i;
if(gpio_obj->id == 0){
rt_hw_interrupt_install(gpio_obj->irq, fh_gpio_interrupt, (void *)gpio_obj, "gpio_0");
}
else if(gpio_obj->id == 1){
rt_hw_interrupt_install(gpio_obj->irq, fh_gpio_interrupt, (void *)gpio_obj, "gpio_1");
}
rt_hw_interrupt_umask(gpio_obj->irq);
for(i=0; i<32; i++)
{
irq_desc[NR_INTERNAL_IRQS + 32 * gpio_obj->id + i].param = gpio_obj;
}
return 0;
}
int fh_gpio_exit(void *priv_data)
{
return 0;
}
struct fh_board_ops gpio_driver_ops =
{
.probe = fh_gpio_probe,
.exit = fh_gpio_exit,
};
void rt_hw_gpio_init(void)
{
PRINT_GPIO_DBG("%s start\n", __func__);
rt_memset(gpio_available, 0, sizeof(int) * NUM_OF_GPIO);
fh_board_driver_register("gpio", &gpio_driver_ops);
PRINT_GPIO_DBG("%s end\n", __func__);
}