rt-thread-official/bsp/raspberry-pi/raspi4-32/driver/drv_gpio.c

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/*
* Copyright (c) 2006-2020, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-04-16 bigmagic first version
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* 2020-06-16 bigmagic add gpio irq
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*/
#include "drv_gpio.h"
#ifdef BSP_USING_PIN
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/*
* gpio_int[0] for BANK0 (pins 0-27)
* gpio_int[1] for BANK1 (pins 28-45)
* gpio_int[2] for BANK2 (pins 46-53)
*/
static struct gpio_irq_def _g_gpio_irq_tbl[GPIO_IRQ_NUM];
uint32_t raspi_get_pin_state(uint32_t fselnum)
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{
uint32_t gpfsel = 0;
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switch (fselnum)
{
case 0:
gpfsel = GPIO_REG_GPFSEL0(GPIO_BASE);
break;
case 1:
gpfsel = GPIO_REG_GPFSEL1(GPIO_BASE);
break;
case 2:
gpfsel = GPIO_REG_GPFSEL2(GPIO_BASE);
break;
case 3:
gpfsel = GPIO_REG_GPFSEL3(GPIO_BASE);
break;
case 4:
gpfsel = GPIO_REG_GPFSEL4(GPIO_BASE);
break;
case 5:
gpfsel = GPIO_REG_GPFSEL5(GPIO_BASE);
break;
default:
break;
}
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return gpfsel;
}
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void raspi_set_pin_state(uint32_t fselnum, uint32_t gpfsel)
{
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switch (fselnum)
{
case 0:
GPIO_REG_GPFSEL0(GPIO_BASE) = gpfsel;
break;
case 1:
GPIO_REG_GPFSEL1(GPIO_BASE) = gpfsel;
break;
case 2:
GPIO_REG_GPFSEL2(GPIO_BASE) = gpfsel;
break;
case 3:
GPIO_REG_GPFSEL3(GPIO_BASE) = gpfsel;
break;
case 4:
GPIO_REG_GPFSEL4(GPIO_BASE) = gpfsel;
break;
case 5:
GPIO_REG_GPFSEL5(GPIO_BASE) = gpfsel;
break;
default:
break;
}
}
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static void gpio_set_pud(GPIO_PIN pin, GPIO_PUPD_FUNC mode)
{
uint32_t fselnum = pin / 16;
uint32_t fselrest = pin % 16;
uint32_t reg_value = 0;
switch (fselnum)
{
case 0:
reg_value = GPIO_PUP_PDN_CNTRL_REG0(GPIO_BASE);
GPIO_PUP_PDN_CNTRL_REG0(GPIO_BASE) = (reg_value | (mode << (fselrest*2)));
break;
case 1:
reg_value = GPIO_PUP_PDN_CNTRL_REG1(GPIO_BASE);
GPIO_PUP_PDN_CNTRL_REG1(GPIO_BASE) = (reg_value | (mode << (fselrest*2)));
break;
case 2:
reg_value = GPIO_PUP_PDN_CNTRL_REG2(GPIO_BASE);
GPIO_PUP_PDN_CNTRL_REG2(GPIO_BASE) = (reg_value | (mode << (fselrest*2)));
break;
case 3:
reg_value = GPIO_PUP_PDN_CNTRL_REG3(GPIO_BASE);
GPIO_PUP_PDN_CNTRL_REG3(GPIO_BASE) = (reg_value | (mode << (fselrest*2)));
break;
default:
break;
}
}
void prev_raspi_pin_mode(GPIO_PIN pin, GPIO_FUNC mode)
{
uint32_t fselnum = pin / 10;
uint32_t fselrest = pin % 10;
uint32_t gpfsel = 0;
gpfsel = raspi_get_pin_state(fselnum);
gpfsel &= ~((uint32_t)(0x07 << (fselrest * 3)));
gpfsel |= (uint32_t)(mode << (fselrest * 3));
raspi_set_pin_state(fselnum, gpfsel);
}
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static void raspi_pin_mode(struct rt_device *dev, rt_base_t pin, rt_base_t mode)
{
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GPIO_FUNC raspi_mode = OUTPUT;
switch (mode)
{
case PIN_MODE_OUTPUT:
raspi_mode = OUTPUT;
break;
case PIN_MODE_INPUT:
raspi_mode = INPUT;
break;
case PIN_MODE_INPUT_PULLUP:
gpio_set_pud(pin, RASPI_PULL_UP);
raspi_mode = INPUT;
break;
case PIN_MODE_INPUT_PULLDOWN:
gpio_set_pud(pin, RASPI_PULL_DOWN);
raspi_mode = INPUT;
break;
case PIN_MODE_OUTPUT_OD:
raspi_mode = OUTPUT;
break;
}
prev_raspi_pin_mode((GPIO_PIN)pin, raspi_mode);
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}
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static void raspi_pin_write(struct rt_device *dev, rt_base_t pin, rt_base_t value)
{
uint32_t num = pin / 32;
if(num == 0)
{
if(value == 0)
{
GPIO_REG_GPSET0(GPIO_BASE) = 1 << (pin % 32);
}
else
{
GPIO_REG_GPCLR0(GPIO_BASE) = 1 << (pin % 32);
}
}
else
{
if(value == 0)
{
GPIO_REG_GPSET1(GPIO_BASE) = 1 << (pin % 32);
}
else
{
GPIO_REG_GPCLR1(GPIO_BASE) = 1 << (pin % 32);
}
}
}
static int raspi_pin_read(struct rt_device *device, rt_base_t pin)
{
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uint32_t num = pin / 32;
uint32_t pin_level = 0;
if(num == 0)
{
if(GPIO_REG_GPLEV0(GPIO_BASE) & (1 << pin))
{
pin_level = 1;
}
else
{
pin_level = 0;
}
}
else
{
if(GPIO_REG_GPLEV1(GPIO_BASE) & (1 << pin))
{
pin_level = 1;
}
else
{
pin_level = 0;
}
}
return pin_level;
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}
static rt_err_t raspi_pin_attach_irq(struct rt_device *device, rt_int32_t pin, rt_uint32_t mode, void (*hdr)(void *args), void *args)
{
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rt_uint8_t index;
rt_uint32_t reg_value;
if (pin <= 27)
index = 0;
else if (pin <= 45)
index = 1;
else
index = 2;
_g_gpio_irq_tbl[index].irq_cb[pin] = hdr;
_g_gpio_irq_tbl[index].irq_arg[pin] = args;
_g_gpio_irq_tbl[index].irq_type[pin] = mode;
rt_uint8_t shift = pin % 32;
rt_uint8_t pin_num = pin / 32;
rt_uint32_t mask = 1 << shift;
switch (mode)
{
case PIN_IRQ_MODE_RISING:
if(pin_num == 0)
{
reg_value = GPIO_REG_GPREN0(GPIO_BASE);
GPIO_REG_GPREN0(GPIO_BASE) = (reg_value & ~ mask) | (mask);
}
else
{
reg_value = GPIO_REG_GPREN1(GPIO_BASE);
GPIO_REG_GPREN1(GPIO_BASE) = (reg_value & ~ mask) | (mask);
}
break;
case PIN_IRQ_MODE_FALLING:
if(pin_num == 0)
{
reg_value = GPIO_REG_GPFEN0(GPIO_BASE);
GPIO_REG_GPFEN0(GPIO_BASE) = (reg_value & ~ mask) | (mask);
}
else
{
reg_value = GPIO_REG_GPFEN1(GPIO_BASE);
GPIO_REG_GPFEN1(GPIO_BASE) = (reg_value & ~ mask) | (mask);
}
break;
case PIN_IRQ_MODE_RISING_FALLING:
if(pin_num == 0)
{
reg_value = GPIO_REG_GPAREN0(GPIO_BASE);
GPIO_REG_GPAREN0(GPIO_BASE) = (reg_value & ~ mask) | (mask);
reg_value = GPIO_REG_GPFEN0(GPIO_BASE);
GPIO_REG_GPFEN0(GPIO_BASE) = (reg_value & ~ mask) | (mask);
}
else
{
reg_value = GPIO_REG_GPAREN1(GPIO_BASE);
GPIO_REG_GPAREN1(GPIO_BASE) = (reg_value & ~ mask) | (mask);
reg_value = GPIO_REG_GPFEN1(GPIO_BASE);
GPIO_REG_GPFEN1(GPIO_BASE) = (reg_value & ~ mask) | (mask);
}
break;
case PIN_IRQ_MODE_HIGH_LEVEL:
if(pin_num == 0)
{
reg_value = GPIO_REG_GPHEN0(GPIO_BASE);
GPIO_REG_GPHEN0(GPIO_BASE) = (reg_value & ~ mask) | (mask);
}
else
{
reg_value = GPIO_REG_GPHEN1(GPIO_BASE);
GPIO_REG_GPHEN1(GPIO_BASE) = (reg_value & ~ mask) | ( mask);
}
break;
case PIN_IRQ_MODE_LOW_LEVEL:
if(pin_num == 0)
{
reg_value = GPIO_REG_GPLEN0(GPIO_BASE);
GPIO_REG_GPLEN0(GPIO_BASE) = (reg_value & ~ mask) | (mask);
}
else
{
reg_value = GPIO_REG_GPLEN1(GPIO_BASE);
GPIO_REG_GPLEN1(GPIO_BASE) = (reg_value & ~ mask) | (mask);
}
break;
}
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return RT_EOK;
}
static rt_err_t raspi_pin_detach_irq(struct rt_device *device, rt_int32_t pin)
{
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rt_uint8_t index;
if (pin <= 27)
index = 0;
else if (pin <= 45)
index = 1;
else
index = 2;
_g_gpio_irq_tbl[index].irq_cb[pin] = RT_NULL;
_g_gpio_irq_tbl[index].irq_arg[pin] = RT_NULL;
_g_gpio_irq_tbl[index].irq_type[pin] = RT_NULL;
_g_gpio_irq_tbl[index].state[pin] = RT_NULL;
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return RT_EOK;
}
rt_err_t raspi_pin_irq_enable(struct rt_device *device, rt_base_t pin, rt_uint32_t enabled)
{
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rt_uint8_t index;
if (pin <= 27)
index = 0;
else if (pin <= 45)
index = 1;
else
index = 2;
if (enabled)
_g_gpio_irq_tbl[index].state[pin] = 1;
else
_g_gpio_irq_tbl[index].state[pin] = 0;
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return RT_EOK;
}
static const struct rt_pin_ops ops =
{
raspi_pin_mode,
raspi_pin_write,
raspi_pin_read,
raspi_pin_attach_irq,
raspi_pin_detach_irq,
raspi_pin_irq_enable,
};
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static void gpio_irq_handler(int irq, void *param)
{
struct gpio_irq_def *irq_def = (struct gpio_irq_def *)param;
rt_uint32_t pin;
rt_uint32_t value;
rt_uint32_t tmpvalue;
if(irq == IRQ_GPIO0)
{
/* 0~27 */
value = GPIO_REG_GPEDS0(GPIO_BASE);
value &= 0x0fffffff;
pin = 0;
GPIO_REG_GPEDS0(GPIO_BASE) = value;
}
else if(irq == IRQ_GPIO1)
{
/* 28-45 */
tmpvalue = GPIO_REG_GPEDS0(GPIO_BASE);
tmpvalue &= (~0x0fffffff);
GPIO_REG_GPEDS0(GPIO_BASE) = tmpvalue;
value = GPIO_REG_GPEDS1(GPIO_BASE);
value &= 0x3fff;
GPIO_REG_GPEDS1(GPIO_BASE) = value;
value = (value) | tmpvalue;
pin = 28;
}
else if (irq == IRQ_GPIO2)
{
/* 46-53 */
value = GPIO_REG_GPEDS1(GPIO_BASE);
value &= (~0x3fff);
GPIO_REG_GPEDS1(GPIO_BASE) = value;
pin = 46;
}
while (value)
{
if ((value & 0x1) && (irq_def->irq_cb[pin] != RT_NULL))
{
if(irq_def->state[pin])
{
irq_def->irq_cb[pin](irq_def->irq_arg[pin]);
}
}
pin++;
value = value >> 1;
}
}
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#endif
int rt_hw_gpio_init(void)
{
#ifdef BSP_USING_PIN
rt_device_pin_register("gpio", &ops, RT_NULL);
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//disable all intr
GPIO_REG_GPEDS0(GPIO_BASE) = 0xffffffff;
GPIO_REG_GPEDS1(GPIO_BASE) = 0xffffffff;
GPIO_REG_GPREN0(GPIO_BASE) = 0x0;
GPIO_REG_GPREN1(GPIO_BASE) = 0x0;
GPIO_REG_GPFEN0(GPIO_BASE) = 0x0;
GPIO_REG_GPFEN1(GPIO_BASE) = 0x0;
GPIO_REG_GPHEN0(GPIO_BASE) = 0x0;
GPIO_REG_GPHEN1(GPIO_BASE) = 0x0;
GPIO_REG_GPAREN0(GPIO_BASE) = 0x0;
GPIO_REG_GPAREN1(GPIO_BASE) = 0x0;
GPIO_REG_GPAFEN0(GPIO_BASE) = 0x0;
GPIO_REG_GPAFEN0(GPIO_BASE) = 0x0;
rt_hw_interrupt_install(IRQ_GPIO0, gpio_irq_handler, &_g_gpio_irq_tbl[0], "gpio0_irq");
rt_hw_interrupt_umask(IRQ_GPIO0);
rt_hw_interrupt_install(IRQ_GPIO1, gpio_irq_handler, &_g_gpio_irq_tbl[1], "gpio1_irq");
rt_hw_interrupt_umask(IRQ_GPIO1);
rt_hw_interrupt_install(IRQ_GPIO2, gpio_irq_handler, &_g_gpio_irq_tbl[2], "gpio2_irq");
rt_hw_interrupt_umask(IRQ_GPIO2);
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#endif
return 0;
}
INIT_DEVICE_EXPORT(rt_hw_gpio_init);