/*      $NetBSD: nslu2_leds.c,v 1.10 2013/08/19 22:26:09 matt Exp $     */

/*-
* Copyright (c) 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Steve C. Woodford.
*
* 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, 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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: nslu2_leds.c,v 1.10 2013/08/19 22:26:09 matt Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/callout.h>
#include <sys/proc.h>
#include <sys/intr.h>
#include <sys/cpu.h>

#include <dev/usb/usb.h>
#include <dev/usb/usbcdc.h>
#include <dev/usb/usbdi.h>              /* XXX: For IPL_USB */

#include <arm/xscale/ixp425var.h>

#include <evbarm/nslu2/nslu2reg.h>

#define SLUGLED_FLASH_LEN       (hz/8)  /* How many ticks an LED stays lit */

#define LEDBITS_USB0            (1u << GPIO_LED_DISK1)
#define LEDBITS_USB1            (1u << GPIO_LED_DISK2)

/*
* The Ready/Status bits control a tricolour LED.
* Ready is green, status is red.
*/
#define LEDBITS_READY           (1u << GPIO_LED_READY)
#define LEDBITS_STATUS          (1u << GPIO_LED_STATUS)

struct slugled_softc {
       void *sc_tmr_ih;
       struct callout sc_usb0;
       void *sc_usb0_ih;
       struct callout sc_usb1;
       void *sc_usb1_ih;
       struct callout sc_usb2;
       void *sc_usb2_ih;
};

static int slugled_attached;

static void
slugled_callout(void *arg)
{
       uint32_t reg, bit;
       int is;

       bit = (uint32_t)(uintptr_t)arg;

       is = disable_interrupts(I32_bit);
       reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPOUTR);
       GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPOUTR, reg | bit);
       restore_interrupts(is);
}

static int
slugled_intr0(void *arg)
{
       struct slugled_softc *sc = arg;
       uint32_t reg;
       int is;

       is = disable_interrupts(I32_bit);
       reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPOUTR);
       reg &= ~LEDBITS_USB0;
       GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPOUTR, reg);
       restore_interrupts(is);

       callout_schedule(&sc->sc_usb0, SLUGLED_FLASH_LEN);

       return (1);
}

static int
slugled_intr1(void *arg)
{
       struct slugled_softc *sc = arg;
       uint32_t reg;
       int is;

       is = disable_interrupts(I32_bit);
       reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPOUTR);
       reg &= ~LEDBITS_USB1;
       GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPOUTR, reg);
       restore_interrupts(is);

       callout_schedule(&sc->sc_usb1, SLUGLED_FLASH_LEN);

       return (1);
}

static int
slugled_intr2(void *arg)
{
       struct slugled_softc *sc = arg;
       uint32_t reg;
       int is;

       is = disable_interrupts(I32_bit);
       reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPOUTR);
       reg &= ~(LEDBITS_USB0 | LEDBITS_USB1);
       GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPOUTR, reg);
       restore_interrupts(is);

       callout_schedule(&sc->sc_usb2, SLUGLED_FLASH_LEN);

       return (1);
}

static int
slugled_tmr(void *arg)
{
       struct clockframe *cf = arg;
       uint32_t reg, bit;
       int is;

       if (CLKF_INTR(cf) || sched_curcpu_runnable_p() ||
           (curlwp != NULL && curlwp != curcpu()->ci_data.cpu_idlelwp))
               bit = LEDBITS_STATUS;
       else
               bit = 0;

       is = disable_interrupts(I32_bit);
       reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPOUTR);
       reg &= ~LEDBITS_STATUS;
       GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPOUTR, reg | bit);
       restore_interrupts(is);

       return (1);
}

static void
slugled_shutdown(void *arg)
{
       struct slugled_softc *sc = arg;
       uint32_t reg;
       int s;

       ixp425_intr_disestablish(sc->sc_usb0_ih);
       ixp425_intr_disestablish(sc->sc_usb1_ih);
       ixp425_intr_disestablish(sc->sc_tmr_ih);

       /* Cancel the callouts */
       s = splsoftclock();
       callout_stop(&sc->sc_usb0);
       callout_stop(&sc->sc_usb1);
       splx(s);

       /* Turn off the disk LEDs, and set Ready/Status to amber */
       s = splhigh();
       reg = GPIO_CONF_READ_4(ixp425_softc,IXP425_GPIO_GPOUTR);
       reg |= LEDBITS_USB0 | LEDBITS_USB1 | LEDBITS_STATUS | LEDBITS_READY;
       GPIO_CONF_WRITE_4(ixp425_softc,IXP425_GPIO_GPOUTR, reg);
       splx(s);
}

static void
slugled_defer(device_t self)
{
       struct slugled_softc *sc = device_private(self);
       struct ixp425_softc *ixsc = ixp425_softc;
       uint32_t reg;
       int s;

       s = splhigh();

       /* Configure LED GPIO pins as output */
       reg = GPIO_CONF_READ_4(ixsc, IXP425_GPIO_GPOER);
       reg &= ~(LEDBITS_USB0 | LEDBITS_USB1);
       reg &= ~(LEDBITS_READY | LEDBITS_STATUS);
       GPIO_CONF_WRITE_4(ixsc, IXP425_GPIO_GPOER, reg);

       /* All LEDs off */
       reg = GPIO_CONF_READ_4(ixsc, IXP425_GPIO_GPOUTR);
       reg |= LEDBITS_USB0 | LEDBITS_USB1;
       reg &= ~(LEDBITS_STATUS | LEDBITS_READY);
       GPIO_CONF_WRITE_4(ixsc, IXP425_GPIO_GPOUTR, reg);

       splx(s);

       if (shutdownhook_establish(slugled_shutdown, sc) == NULL)
               aprint_error_dev(self, "WARNING - Failed to register shutdown hook\n");

       callout_init(&sc->sc_usb0, 0);
       callout_setfunc(&sc->sc_usb0, slugled_callout,
           (void *)(uintptr_t)LEDBITS_USB0);

       callout_init(&sc->sc_usb1, 0);
       callout_setfunc(&sc->sc_usb1, slugled_callout,
           (void *)(uintptr_t)LEDBITS_USB1);

       callout_init(&sc->sc_usb2, 0);
       callout_setfunc(&sc->sc_usb2, slugled_callout,
           (void *)(uintptr_t)(LEDBITS_USB0 | LEDBITS_USB1));

       sc->sc_usb0_ih = ixp425_intr_establish(PCI_INT_A, IPL_USB,
           slugled_intr0, sc);
       KDASSERT(sc->sc_usb0_ih != NULL);
       sc->sc_usb1_ih = ixp425_intr_establish(PCI_INT_B, IPL_USB,
           slugled_intr1, sc);
       KDASSERT(sc->sc_usb1_ih != NULL);
       sc->sc_usb2_ih = ixp425_intr_establish(PCI_INT_C, IPL_USB,
           slugled_intr2, sc);
       KDASSERT(sc->sc_usb2_ih != NULL);

       sc->sc_tmr_ih = ixp425_intr_establish(IXP425_INT_TMR0, IPL_CLOCK,
           slugled_tmr, NULL);
       KDASSERT(sc->sc_tmr_ih != NULL);
}

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

       return (slugled_attached == 0);
}

static void
slugled_attach(device_t parent, device_t self, void *aux)
{

       aprint_normal(": LED support\n");

       slugled_attached = 1;

       config_interrupts(self, slugled_defer);
}

CFATTACH_DECL_NEW(slugled, sizeof(struct slugled_softc),
   slugled_match, slugled_attach, NULL, NULL);

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