/*      $NetBSD: zusb.c,v 1.6 2011/07/19 15:11:49 dyoung Exp $  */

/*
 * Copyright (c) 2008 Christopher Gilbert
 * All rights reserved.
 *
 * 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. The name of the company nor the name of the author may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: zusb.c,v 1.6 2011/07/19 15:11:49 dyoung Exp $");

#include <sys/param.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/bus.h>

#include <arm/xscale/pxa2x0reg.h>
#include <arm/xscale/pxa2x0var.h>
#include <arm/xscale/pxa2x0_gpio.h>

#include <machine/intr.h>

#include <zaurus/zaurus/zaurus_reg.h>
#include <zaurus/zaurus/zaurus_var.h>


#ifdef ZUSB_DEBUG
#define DPRINTF(s)      printf s
#else
#define DPRINTF(s)
#endif


struct zusb_softc {
        device_t sc_dev;

        bus_space_tag_t sc_iot;
        bus_space_handle_t sc_ioh;

        void *sc_client_ih;
        void *sc_host_ih;
};

static int      zusb_match(device_t, cfdata_t, void *);
static void     zusb_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(zusb, sizeof(struct zusb_softc), 
    zusb_match, zusb_attach, NULL, NULL);

static int      zusb_client_intr(void *);
static int      zusb_host_intr(void *);
static void     zusb_test_and_enabled_host_port(struct zusb_softc *);

static int
zusb_match(device_t parent, cfdata_t cf, void *aux)
{

        if (ZAURUS_ISC1000 || ZAURUS_ISC3000)
                return 1;
        return 0;
}

static void
zusb_attach(device_t parent, device_t self, void *aux)
{
        struct zusb_softc *sc = device_private(self);
        struct pxaip_attach_args *pxa = aux;

        aprint_normal(": USB Mode detection\n");
        aprint_naive("\n");

        sc->sc_dev = self;
        sc->sc_iot = pxa->pxa_iot;

        /* Map I/O space */
        if (bus_space_map(sc->sc_iot, PXA2X0_USBDC_BASE, PXA270_USBDC_SIZE, 0,
                                &sc->sc_ioh)) {
                aprint_error_dev(sc->sc_dev, "couldn't map memory space\n");
                return;
        }

        pxa2x0_gpio_set_function(C3000_USB_DEVICE_PIN, GPIO_IN);
        sc->sc_client_ih = pxa2x0_gpio_intr_establish(C3000_USB_DEVICE_PIN,
            IST_EDGE_BOTH, IPL_BIO, zusb_client_intr, sc);

        pxa2x0_gpio_set_function(C3000_USB_HOST_PIN, GPIO_IN);
        sc->sc_host_ih = pxa2x0_gpio_intr_establish(C3000_USB_HOST_PIN,
            IST_EDGE_BOTH, IPL_BIO, zusb_host_intr, sc);

        /* configure port 2 for input */
        bus_space_write_4(sc->sc_iot, sc->sc_ioh, USBDC_UP2OCR,
                        USBDC_UP2OCR_HXS | USBDC_UP2OCR_HXOE | 
                        USBDC_UP2OCR_DPPDE | USBDC_UP2OCR_DMPDE);

        zusb_test_and_enabled_host_port(sc);
}

static int
zusb_client_intr(void *v)
{
        struct zusb_softc *sc = v;

        DPRINTF(("%s: USB client cable changed\n", device_xname(sc->sc_dev)));
        zusb_test_and_enabled_host_port(sc);

        return 1;
}
        
static int
zusb_host_intr(void *v)
{
        struct zusb_softc *sc = v;

        DPRINTF(("%s: USB host cable changed\n", device_xname(sc->sc_dev)));
        zusb_test_and_enabled_host_port(sc);

        return 1;
}
        
static void
zusb_test_and_enabled_host_port(struct zusb_softc *sc)
{
        int host_cable = pxa2x0_gpio_get_bit(C3000_USB_HOST_PIN);
#ifdef ZUSB_DEBUG
        int client_cable = pxa2x0_gpio_get_bit(C3000_USB_DEVICE_PIN);
#endif

        DPRINTF(("%s: USB cable: host %d, client %d\n",
            device_xname(sc->sc_dev), host_cable, client_cable));

        if (!host_cable) {
                pxa2x0_gpio_set_function(C3000_USB_HOST_POWER_PIN,
                    GPIO_OUT | GPIO_SET);
                DPRINTF(("%s: USB host power enabled\n",
                    device_xname(sc->sc_dev)));
        } else {
                pxa2x0_gpio_set_function(C3000_USB_HOST_POWER_PIN,
                    GPIO_OUT | GPIO_CLR);
                DPRINTF(("%s: USB host power disabled\n",
                    device_xname(sc->sc_dev)));
        }
}