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/* from $OpenBSD$ */
/*
* ported to NetBSD by Frank Kardel
* (http://permalink.gmane.org/gmane.os.openbsd.tech/31317)
*
* Copyright (c) 2013 Matt Dainty <matt <at> 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: soekrisgpio.c,v 1.5 2021/08/07 16:19:12 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/device.h>
#include <sys/bus.h>
#include <machine/autoconf.h>
#include <dev/isa/isavar.h>
#include <sys/gpio.h>
#include <dev/gpio/gpiovar.h>
#include "gpio.h"
#define SOEKRIS_BASE 0x680 /* Base address of FPGA I/O */
#define SOEKRIS_IOSIZE 32 /* I/O region size */
#define SOEKRIS_NPINS 16 /* Number of Pins */
#define SOEKRIS_GPIO_INPUT 0x000 /* Current state of pins */
#define SOEKRIS_GPIO_OUTPUT 0x004 /* Set state of output pins */
#define SOEKRIS_GPIO_RESET 0x008 /* Reset output pins */
#define SOEKRIS_GPIO_SET 0x00c /* Set output pins */
#define SOEKRIS_GPIO_DIR 0x010 /* Direction, set for output */
#define SOEKRIS_NLEDS 2 /* Number of LEDs */
#define SOEKRIS_LED_ERROR 0x01c /* Offset to error LED */
#define SOEKRIS_LED_READY 0x01d /* Offset to ready LED */
const u_int soekris_led_offset[SOEKRIS_NLEDS] = {
SOEKRIS_LED_ERROR, SOEKRIS_LED_READY
};
struct soekris_softc {
device_t 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[SOEKRIS_NPINS];
/* Fake GPIO device for the LEDs */
struct gpio_chipset_tag sc_led_gc;
gpio_pin_t sc_led_pins[SOEKRIS_NLEDS];
};
static int soekris_match(device_t, cfdata_t , void *);
static void soekris_attach(device_t, device_t, void *);
static int soekris_detach(device_t, int);
static int soekris_gpio_read(void *, int);
static void soekris_gpio_write(void *, int, int);
static void soekris_gpio_ctl(void *, int, int);
static int soekris_led_read(void *, int);
static void soekris_led_write(void *, int, int);
static void soekris_led_ctl(void *, int, int);
CFATTACH_DECL_NEW(soekrisgpio,
sizeof(struct soekris_softc),
soekris_match,
soekris_attach,
soekris_detach,
NULL);
static int
soekris_match(device_t parent, cfdata_t match, void *aux)
{
struct isa_attach_args *ia = aux;
bus_space_handle_t ioh;
int iobase;
if (ia->ia_nio < 1)
return (0);
/* Disallow wildcarded i/o address. */
if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
return (0);
iobase = ia->ia_io[0].ir_addr;
/* Need some sort of heuristic to match the Soekris net6501 */
if (iobase != SOEKRIS_BASE || bus_space_map(ia->ia_iot,
iobase, SOEKRIS_IOSIZE, 0, &ioh) != 0)
return (0);
bus_space_unmap(ia->ia_iot, ioh, SOEKRIS_IOSIZE);
ia->ia_io[0].ir_size = SOEKRIS_IOSIZE;
return (1);
}
static void
soekris_attach(device_t parent, device_t self, void *aux)
{
struct soekris_softc *sc = device_private(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_io[0].ir_addr,
ia->ia_io[0].ir_size, 0, &sc->sc_ioh) != 0) {
aprint_normal(": can't map i/o space\n");
return;
}
aprint_normal("\n");
sc->sc_dev = self;
sc->sc_iot = ia->ia_iot;
data = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SOEKRIS_GPIO_DIR);
for (i = 0; i < SOEKRIS_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 = soekris_gpio_read(sc, i);
}
sc->sc_gpio_gc.gp_cookie = sc;
sc->sc_gpio_gc.gp_pin_read = soekris_gpio_read;
sc->sc_gpio_gc.gp_pin_write = soekris_gpio_write;
sc->sc_gpio_gc.gp_pin_ctl = soekris_gpio_ctl;
gba1.gba_gc = &sc->sc_gpio_gc;
gba1.gba_pins = sc->sc_gpio_pins;
gba1.gba_npins = SOEKRIS_NPINS;
for (i = 0; i < SOEKRIS_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 = soekris_led_read(sc, i);
}
sc->sc_led_gc.gp_cookie = sc;
sc->sc_led_gc.gp_pin_read = soekris_led_read;
sc->sc_led_gc.gp_pin_write = soekris_led_write;
sc->sc_led_gc.gp_pin_ctl = soekris_led_ctl;
gba2.gba_gc = &sc->sc_led_gc;
gba2.gba_pins = sc->sc_led_pins;
gba2.gba_npins = SOEKRIS_NLEDS;
#if NGPIO > 0
(void)config_found(sc->sc_dev, &gba1, gpiobus_print, CFARGS_NONE);
(void)config_found(sc->sc_dev, &gba2, gpiobus_print, CFARGS_NONE);
#endif
}
static int
soekris_detach(device_t self, int flags)
{
struct soekris_softc *sc = device_private(self);
bus_space_unmap(sc->sc_iot, sc->sc_ioh, SOEKRIS_IOSIZE);
return 0;
}
static int
soekris_gpio_read(void *arg, int pin)
{
struct soekris_softc *sc = arg;
u_int16_t data;
data = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SOEKRIS_GPIO_INPUT);
return (data & (1 << pin)) ? GPIO_PIN_HIGH : GPIO_PIN_LOW;
}
static void
soekris_gpio_write(void *arg, int pin, int value)
{
struct soekris_softc *sc = arg;
u_int16_t data;
data = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SOEKRIS_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, SOEKRIS_GPIO_OUTPUT, data);
}
static void
soekris_gpio_ctl(void *arg, int pin, int flags)
{
struct soekris_softc *sc = arg;
u_int16_t data;
data = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SOEKRIS_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, SOEKRIS_GPIO_DIR, data);
}
static int
soekris_led_read(void *arg, int pin)
{
struct soekris_softc *sc = arg;
u_int8_t value;
value = bus_space_read_1(sc->sc_iot, sc->sc_ioh,
soekris_led_offset[pin]);
return (value & 0x1) ? GPIO_PIN_HIGH : GPIO_PIN_LOW;
}
static void
soekris_led_write(void *arg, int pin, int value)
{
struct soekris_softc *sc = arg;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, soekris_led_offset[pin],
value);
}
static void
soekris_led_ctl(void *arg, int pin, int flags)
{
}
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