Add skgpio(4) a driver for the Soekris net6501 GPIO and LEDs

from Matt Dainty.

1 files changed, 239 insertions, 0 deletions

diff --git a/sys/dev/isa/skgpio.c b/sys/dev/isa/skgpio.c
new file mode 100644
index 00000000000..af303ab4dd1
--- /dev/null
+++ b/sys/dev/isa/skgpio.c
@@ -0,0 +1,239 @@
+/*	$OpenBSD: skgpio.c,v 1.1 2014/12/10 05:42:25 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 <machine/intr.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 (strcmp(hw_vendor, "Soekris Engineering") ||
+	    strcmp(hw_prod, "net6501"))
+		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)
+{
+}