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/* $OpenBSD: skgpio.c,v 1.3 2015/03/14 03:38:47 jsg Exp $ */
/*
* Copyright (c) 2014 Matt Dainty <matt@bodgit-n-scarper.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Soekris net6501 GPIO and LEDs as implemented by the onboard Xilinx FPGA
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/gpio.h>
#include <machine/bus.h>
#include <dev/isa/isavar.h>
#include <dev/gpio/gpiovar.h>
#define SKGPIO_BASE 0x680 /* Base address of FPGA I/O */
#define SKGPIO_IOSIZE 32 /* I/O region size */
#define SKGPIO_NPINS 16 /* Number of Pins */
#define SKGPIO_GPIO_INPUT 0x000 /* Current state of pins */
#define SKGPIO_GPIO_OUTPUT 0x004 /* Set state of output pins */
#define SKGPIO_GPIO_RESET 0x008 /* Reset output pins */
#define SKGPIO_GPIO_SET 0x00c /* Set output pins */
#define SKGPIO_GPIO_DIR 0x010 /* Direction, set for output */
#define SKGPIO_NLEDS 2 /* Number of LEDs */
#define SKGPIO_LED_ERROR 0x01c /* Offset to error LED */
#define SKGPIO_LED_READY 0x01d /* Offset to ready LED */
extern char *hw_vendor, *hw_prod;
const u_int skgpio_led_offset[SKGPIO_NLEDS] = {
SKGPIO_LED_ERROR, SKGPIO_LED_READY
};
struct skgpio_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct gpio_chipset_tag sc_gpio_gc;
gpio_pin_t sc_gpio_pins[SKGPIO_NPINS];
/* Fake GPIO device for the LEDs */
struct gpio_chipset_tag sc_led_gc;
gpio_pin_t sc_led_pins[SKGPIO_NLEDS];
};
int skgpio_match(struct device *, void *, void *);
void skgpio_attach(struct device *, struct device *, void *);
int skgpio_gpio_read(void *, int);
void skgpio_gpio_write(void *, int, int);
void skgpio_gpio_ctl(void *, int, int);
int skgpio_led_read(void *, int);
void skgpio_led_write(void *, int, int);
void skgpio_led_ctl(void *, int, int);
struct cfattach skgpio_ca = {
sizeof(struct skgpio_softc), skgpio_match, skgpio_attach
};
struct cfdriver skgpio_cd = {
NULL, "skgpio", DV_DULL
};
int
skgpio_match(struct device *parent, void *match, void *aux)
{
struct isa_attach_args *ia = aux;
bus_space_handle_t ioh;
if (hw_vendor == NULL || hw_prod == NULL ||
strcmp(hw_vendor, "Soekris Engineering") != 0 ||
strcmp(hw_prod, "net6501") != 0)
return (0);
if (ia->ia_iobase != SKGPIO_BASE || bus_space_map(ia->ia_iot,
ia->ia_iobase, SKGPIO_IOSIZE, 0, &ioh) != 0)
return (0);
bus_space_unmap(ia->ia_iot, ioh, SKGPIO_IOSIZE);
ia->ia_iosize = SKGPIO_IOSIZE;
ia->ipa_nio = 1;
ia->ipa_nmem = 0;
ia->ipa_nirq = 0;
ia->ipa_ndrq = 0;
return (1);
}
void
skgpio_attach(struct device *parent, struct device *self, void *aux)
{
struct skgpio_softc *sc = (void *)self;
struct isa_attach_args *ia = aux;
struct gpiobus_attach_args gba1, gba2;
u_int data;
int i;
if (bus_space_map(ia->ia_iot, ia->ia_iobase, ia->ia_iosize, 0,
&sc->sc_ioh) != 0) {
printf(": can't map i/o space\n");
return;
}
printf("\n");
sc->sc_iot = ia->ia_iot;
data = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SKGPIO_GPIO_DIR);
for (i = 0; i < SKGPIO_NPINS; i++) {
sc->sc_gpio_pins[i].pin_num = i;
sc->sc_gpio_pins[i].pin_caps = GPIO_PIN_INPUT |
GPIO_PIN_OUTPUT;
sc->sc_gpio_pins[i].pin_flags = (data & (1 << i)) ?
GPIO_PIN_OUTPUT : GPIO_PIN_INPUT;
sc->sc_gpio_pins[i].pin_state = skgpio_gpio_read(sc, i);
}
sc->sc_gpio_gc.gp_cookie = sc;
sc->sc_gpio_gc.gp_pin_read = skgpio_gpio_read;
sc->sc_gpio_gc.gp_pin_write = skgpio_gpio_write;
sc->sc_gpio_gc.gp_pin_ctl = skgpio_gpio_ctl;
gba1.gba_name = "gpio";
gba1.gba_gc = &sc->sc_gpio_gc;
gba1.gba_pins = sc->sc_gpio_pins;
gba1.gba_npins = SKGPIO_NPINS;
(void)config_found(&sc->sc_dev, &gba1, gpiobus_print);
for (i = 0; i < SKGPIO_NLEDS; i++) {
sc->sc_led_pins[i].pin_num = i;
sc->sc_led_pins[i].pin_caps = GPIO_PIN_OUTPUT;
sc->sc_led_pins[i].pin_flags = GPIO_PIN_OUTPUT;
sc->sc_led_pins[i].pin_state = skgpio_led_read(sc, i);
}
sc->sc_led_gc.gp_cookie = sc;
sc->sc_led_gc.gp_pin_read = skgpio_led_read;
sc->sc_led_gc.gp_pin_write = skgpio_led_write;
sc->sc_led_gc.gp_pin_ctl = skgpio_led_ctl;
gba2.gba_name = "gpio";
gba2.gba_gc = &sc->sc_led_gc;
gba2.gba_pins = sc->sc_led_pins;
gba2.gba_npins = SKGPIO_NLEDS;
(void)config_found(&sc->sc_dev, &gba2, gpiobus_print);
}
int
skgpio_gpio_read(void *arg, int pin)
{
struct skgpio_softc *sc = arg;
u_int16_t data;
data = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SKGPIO_GPIO_INPUT);
return (data & (1 << pin)) ? GPIO_PIN_HIGH : GPIO_PIN_LOW;
}
void
skgpio_gpio_write(void *arg, int pin, int value)
{
struct skgpio_softc *sc = arg;
u_int16_t data;
data = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SKGPIO_GPIO_INPUT);
if (value == GPIO_PIN_LOW)
data &= ~(1 << pin);
else if (value == GPIO_PIN_HIGH)
data |= (1 << pin);
bus_space_write_2(sc->sc_iot, sc->sc_ioh, SKGPIO_GPIO_OUTPUT, data);
}
void
skgpio_gpio_ctl(void *arg, int pin, int flags)
{
struct skgpio_softc *sc = arg;
u_int16_t data;
data = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SKGPIO_GPIO_DIR);
if (flags & GPIO_PIN_INPUT)
data &= ~(1 << pin);
if (flags & GPIO_PIN_OUTPUT)
data |= (1 << pin);
bus_space_write_2(sc->sc_iot, sc->sc_ioh, SKGPIO_GPIO_DIR, data);
}
int
skgpio_led_read(void *arg, int pin)
{
struct skgpio_softc *sc = arg;
u_int8_t value;
value = bus_space_read_1(sc->sc_iot, sc->sc_ioh,
skgpio_led_offset[pin]);
return (value & 0x1) ? GPIO_PIN_HIGH : GPIO_PIN_LOW;
}
void
skgpio_led_write(void *arg, int pin, int value)
{
struct skgpio_softc *sc = arg;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, skgpio_led_offset[pin],
value);
}
void
skgpio_led_ctl(void *arg, int pin, int flags)
{
}
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