nes-proj/cpu/x86/drivers/quarkX1000/gpio.c

185 lines
4.3 KiB
C
Raw Normal View History

/*
* Copyright (C) 2015, Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "gpio.h"
#include "helpers.h"
/* GPIO Controler Registers */
#define SWPORTA_DR 0x00
#define SWPORTA_DDR 0x04
#define INTEN 0x30
#define INTMASK 0x34
#define INTTYPE_LEVEL 0x38
#define INT_POLARITY 0x3c
#define INTSTATUS 0x40
#define RAW_INTSTATUS 0x44
#define DEBOUNCE 0x48
#define PORTA_EOI 0x4c
#define EXT_PORTA 0x50
#define LS_SYNC 0x60
#define PINS 8
struct gpio_internal_data {
pci_driver_t pci;
};
static struct gpio_internal_data data;
static inline uint32_t
read(uint32_t base_addr, uint32_t offset)
{
return *(uint32_t*)(base_addr + offset);
}
static inline void
write(uint32_t base_addr, uint32_t offset, uint32_t val)
{
*(uint32_t*)(base_addr + offset) = val;
}
/* value must be 0x0 or 0x1 */
static void
set_bit(uint32_t base_addr, uint32_t offset, uint32_t bit, uint32_t value)
{
uint32_t reg;
reg = read(base_addr, offset);
reg &= ~BIT(bit);
reg |= value << bit;
write(base_addr, offset, reg);
}
int
quarkX1000_gpio_config(uint8_t pin, int flags)
{
if (((flags & QUARKX1000_GPIO_IN) && (flags & QUARKX1000_GPIO_OUT)) ||
((flags & QUARKX1000_GPIO_INT) && (flags & QUARKX1000_GPIO_OUT))) {
return -1;
}
/* interrupts are not supported yet */
if (flags & QUARKX1000_GPIO_INT)
return -1;
/* set direction */
set_bit(data.pci.mmio, SWPORTA_DDR, pin, !!(flags & QUARKX1000_GPIO_OUT));
/* set interrupt disabled */
set_bit(data.pci.mmio, INTEN, pin, 0);
return 0;
}
int
quarkX1000_gpio_config_port(int flags)
{
uint8_t i;
for (i = 0; i < PINS; i++) {
if (quarkX1000_gpio_config(i, flags) < 0) {
return -1;
}
}
return 0;
}
int
quarkX1000_gpio_read(uint8_t pin, uint8_t *value)
{
uint32_t value32 = read(data.pci.mmio, EXT_PORTA);
*value = !!(value32 & BIT(pin));
return 0;
}
int
quarkX1000_gpio_write(uint8_t pin, uint8_t value)
{
set_bit(data.pci.mmio, SWPORTA_DR, pin, !!value);
return 0;
}
int
quarkX1000_gpio_read_port(uint8_t *value)
{
uint32_t value32 = read(data.pci.mmio, EXT_PORTA);
*value = value32 & ~0xFFFFFF00;
return 0;
}
int
quarkX1000_gpio_write_port(uint8_t value)
{
write(data.pci.mmio, SWPORTA_DR, value);
return 0;
}
void
quarkX1000_gpio_clock_enable(void)
{
set_bit(data.pci.mmio, LS_SYNC, 0, 1);
}
void
quarkX1000_gpio_clock_disable(void)
{
set_bit(data.pci.mmio, LS_SYNC, 0, 0);
}
int
quarkX1000_gpio_init(void)
{
pci_config_addr_t pci_addr;
pci_addr.raw = 0;
pci_addr.bus = 0;
pci_addr.dev = 21;
pci_addr.func = 2;
pci_addr.reg_off = PCI_CONFIG_REG_BAR1;
pci_command_enable(pci_addr, PCI_CMD_1_MEM_SPACE_EN);
pci_init(&data.pci, pci_addr, 0);
quarkX1000_gpio_clock_enable();
/* clear registers */
write(data.pci.mmio, INTEN, 0);
write(data.pci.mmio, INTMASK, 0);
write(data.pci.mmio, PORTA_EOI, 0);
return 0;
}