Support for accesing 8-bit ISA I/O throught the gpio(4)

framework. Allows to use stupid GPIO device on the
Acrosser AR-B1662 board.

Work by form@.

3 files changed, 164 insertions, 2 deletions

diff --git a/sys/arch/i386/conf/GENERIC b/sys/arch/i386/conf/GENERIC
index 08ffb417937..3d84d229cd8 100644
--- a/sys/arch/i386/conf/GENERIC
+++ b/sys/arch/i386/conf/GENERIC
@@ -1,4 +1,4 @@
-#	$OpenBSD: GENERIC,v 1.477 2006/03/24 10:39:08 jsg Exp $
+#	$OpenBSD: GENERIC,v 1.478 2006/03/26 20:19:53 grange Exp $
 #
 # For further information on compiling OpenBSD kernels, see the config(8)
 # man page.
@@ -140,6 +140,9 @@ asbtm*	at iic?				# Asus ASB100
 wbenv*	at iic?				# Winbond W83L784R/W83L785R/W83L785TS-L
 glenv*	at iic?				# Genesys Logic GL518SM
 
+#isagpio0 at isa? port 0x78		# ISA I/O mapped as GPIO
+#isagpio1 at isa? port 0x80
+
 # ISA PCMCIA controllers
 #option PCMCIAVERBOSE
 pcic0	at isa? port 0x3e0 iomem 0xd0000 iosiz 0x10000
diff --git a/sys/dev/isa/files.isa b/sys/dev/isa/files.isa
index 71d74c49453..4bfb490ca32 100644
--- a/sys/dev/isa/files.isa
+++ b/sys/dev/isa/files.isa
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.isa,v 1.93 2006/01/28 11:25:17 kettenis Exp $
+#	$OpenBSD: files.isa,v 1.94 2006/03/26 20:19:53 grange Exp $
 #	$NetBSD: files.isa,v 1.21 1996/05/16 03:45:55 mycroft Exp $
 #
 # Config file and device description for machine-independent ISA code.
@@ -403,6 +403,11 @@ device	aps
 attach	aps at isa
 file	dev/isa/aps.c			aps
 
+# ISA I/O mapped as GPIO
+device	isagpio: gpiobus
+attach	isagpio at isa
+file	dev/isa/isagpio.c		isagpio
+
 #
 # PCMCIA PCIC (i82365SL and compatibles):
 #
diff --git a/sys/dev/isa/isagpio.c b/sys/dev/isa/isagpio.c
new file mode 100644
index 00000000000..63b7485a2d4
--- /dev/null
+++ b/sys/dev/isa/isagpio.c
@@ -0,0 +1,154 @@
+/*	$OpenBSD: isagpio.c,v 1.1 2006/03/26 20:19:53 grange Exp $	*/
+
+/*
+ * Copyright (c) 2006 Oleg Safiullin <form@pdp-11.org.ru>
+ * 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 unmodified, 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <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 ISAGPIO_IOSIZE		1
+#define ISAGPIO_NPINS		8
+
+struct isagpio_softc {
+	struct device		sc_dev;
+
+	bus_space_tag_t		sc_iot;
+	bus_space_handle_t	sc_ioh;
+
+	struct gpio_chipset_tag	sc_gpio_gc;
+	struct gpio_pin		sc_gpio_pins[ISAGPIO_NPINS];
+	u_int8_t		sc_gpio_mask;
+};
+
+int	isagpio_match(struct device *, void *, void *);
+void	isagpio_attach(struct device *, struct device *, void *);
+int	isagpio_pin_read(void *, int);
+void	isagpio_pin_write(void *, int, int);
+void	isagpio_pin_ctl(void *, int, int);
+
+struct cfattach isagpio_ca = {
+	sizeof(struct isagpio_softc), isagpio_match, isagpio_attach
+};
+
+struct cfdriver isagpio_cd = {
+	NULL, "isagpio", DV_DULL
+};
+
+int
+isagpio_match(struct device *parent, void *match, void *aux)
+{
+	struct isa_attach_args *ia = aux;
+	bus_space_handle_t ioh;
+
+	if (bus_space_map(ia->ia_iot, ia->ia_iobase, ISAGPIO_IOSIZE, 0, &ioh))
+		return (0);
+
+	bus_space_unmap(ia->ia_iot, ioh, ISAGPIO_IOSIZE);
+	ia->ia_iosize = ISAGPIO_IOSIZE;
+	ia->ipa_nio = 1;
+	ia->ipa_nmem = 0;
+	ia->ipa_nirq = 0;
+	ia->ipa_ndrq = 0;
+
+	return (1);
+}
+
+void
+isagpio_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct isagpio_softc *sc = (void *)self;
+	struct isa_attach_args *ia = aux;
+	struct gpiobus_attach_args gba;
+	u_int16_t mask;
+	int i;
+
+	if (bus_space_map(ia->ia_iot, ia->ia_iobase, ia->ia_iosize, 0,
+	    &sc->sc_ioh) != 0) {
+		printf(": couldn't map I/O space\n");
+		return;
+	}
+
+	printf("\n");
+
+	sc->sc_iot = ia->ia_iot;
+	sc->sc_gpio_mask = 0;
+
+	for (i = 0, mask = 0x01; i < ISAGPIO_NPINS; mask <<= 1, 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_state = 0;
+	}
+
+	sc->sc_gpio_gc.gp_cookie = sc;
+	sc->sc_gpio_gc.gp_pin_read = isagpio_pin_read;
+	sc->sc_gpio_gc.gp_pin_write = isagpio_pin_write;
+	sc->sc_gpio_gc.gp_pin_ctl = isagpio_pin_ctl;
+
+	gba.gba_name = "gpio";
+	gba.gba_gc = &sc->sc_gpio_gc;
+	gba.gba_pins = sc->sc_gpio_pins;
+	gba.gba_npins = ISAGPIO_NPINS;
+
+	(void)config_found(&sc->sc_dev, &gba, gpiobus_print);
+}
+
+int
+isagpio_pin_read(void *arg, int pin)
+{
+	struct isagpio_softc *sc = arg;
+	u_int8_t mask;
+
+	mask = bus_space_read_1(sc->sc_iot, sc->sc_ioh, 0);
+	return ((mask >> pin) & 0x0001);
+}
+
+void
+isagpio_pin_write(void *arg, int pin, int value)
+{
+	struct isagpio_softc *sc = arg;
+
+	if (value == GPIO_PIN_LOW)
+		sc->sc_gpio_mask &= ~(0x01 << pin);
+	else if (value == GPIO_PIN_HIGH)
+		sc->sc_gpio_mask |= 0x01 << pin;
+	bus_space_write_1(sc->sc_iot, sc->sc_ioh, 0, sc->sc_gpio_mask);
+}
+
+void
+isagpio_pin_ctl(void *arg, int pin, int flags)
+{
+}