/*	$NetBSD: vrc4172pwm.c,v 1.22 2012/10/27 17:17:55 chs Exp $	*/

/*
 * Copyright (c) 2000,2001 SATO Kazumi. 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, 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vrc4172pwm.c,v 1.22 2012/10/27 17:17:55 chs Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/reboot.h>

#include <machine/bus.h>
#include <machine/config_hook.h>
#include <machine/platid.h>
#include <machine/platid_mask.h>

#include <hpcmips/vr/vr.h>
#include <hpcmips/vr/vripif.h>
#include <hpcmips/vr/vrc4172pwmvar.h>
#include <hpcmips/vr/vrc4172pwmreg.h>

#include "locators.h"

#ifdef VRC2PWMDEBUG
#ifndef VRC2PWMDEBUG_CONF
#define VRC2PWMDEBUG_CONF 0
#endif /* VRC2PWMDEBUG_CONF */
int vrc4172pwmdebug = VRC2PWMDEBUG_CONF;
#define DPRINTF(arg) if (vrc4172pwmdebug) printf arg;
#define VPRINTF(arg) if (bootverbose||vrc4172pwmdebug) printf arg;
#define VDUMPREG(arg) if (bootverbose||vrc4172pwmdebug) vrc4172pwm_dumpreg(arg);
#else /* VRC2PWMDEBUG */
#define DPRINTF(arg)
#define VPRINTF(arg) if (bootverbose) printf arg;
#define VDUMPREG(arg) if (bootverbose) vrc4172pwm_dumpreg(arg);
#endif /* VRC2PWMDEBUG */

static int vrc4172pwmprobe(device_t, cfdata_t, void *);
static void vrc4172pwmattach(device_t, device_t, void *);

static void vrc4172pwm_write(struct vrc4172pwm_softc *, int, unsigned short);
static unsigned short vrc4172pwm_read(struct vrc4172pwm_softc *, int);

static int vrc4172pwm_event(void *, int, long, void *);
static int vrc4172pwm_pmevent(void *, int, long, void *);

static void vrc4172pwm_dumpreg(struct vrc4172pwm_softc *);
static void vrc4172pwm_init_brightness(struct vrc4172pwm_softc *);
void vrc4172pwm_light(struct vrc4172pwm_softc *, int);
int vrc4172pwm_get_light(struct vrc4172pwm_softc *);
int vrc4172pwm_get_brightness(struct vrc4172pwm_softc *);
void vrc4172pwm_set_brightness(struct vrc4172pwm_softc *, int);
int vrc4172pwm_rawduty2brightness(struct vrc4172pwm_softc *);
int vrc4172pwm_brightness2rawduty(struct vrc4172pwm_softc *);
struct vrc4172pwm_param * vrc4172pwm_getparam(void);
void vrc4172pwm_dumpreg(struct vrc4172pwm_softc *);

CFATTACH_DECL_NEW(vrc4172pwm, sizeof(struct vrc4172pwm_softc),
    vrc4172pwmprobe, vrc4172pwmattach, NULL, NULL);

/*
 * platform related parameters
 */
struct vrc4172pwm_param vrc4172pwm_mcr520_param = {
	1, /* probe broken */
	8, /* levels */
	{ 0x16, 0x1f, 0x24, 0x2a, 0x2f, 0x34, 0x3a, 0x3f }
};

struct vrc4172pwm_param vrc4172pwm_mcr530_param = {
	0,
	8, /* levels */
	{ 0x16, 0x1b, 0x20, 0x25, 0x2a, 0x30, 0x37, 0x3f }
};

struct vrc4172pwm_param vrc4172pwm_mcr700_param = {
	1, /* probe broken */
	8, /* levels */
	{ 0x12, 0x15, 0x18, 0x1d, 0x24, 0x2d, 0x38, 0x3f }
};

struct vrc4172pwm_param vrc4172pwm_sigmarion_param = {
	0,
	8, /* levels */
	{ 0xe, 0x13, 0x18, 0x1c, 0x23, 0x29, 0x32, 0x3f }
};


struct platid_data vrc4172pwm_platid_param_table[] = {
	{ &platid_mask_MACH_NEC_MCR_430,	&vrc4172pwm_mcr530_param},
	{ &platid_mask_MACH_NEC_MCR_510,	&vrc4172pwm_mcr520_param},
	{ &platid_mask_MACH_NEC_MCR_520,	&vrc4172pwm_mcr520_param},
	{ &platid_mask_MACH_NEC_MCR_520A,	&vrc4172pwm_mcr520_param},
	{ &platid_mask_MACH_NEC_MCR_530,	&vrc4172pwm_mcr530_param},
	{ &platid_mask_MACH_NEC_MCR_530A,	&vrc4172pwm_mcr530_param},
	{ &platid_mask_MACH_NEC_MCR_SIGMARION,	&vrc4172pwm_sigmarion_param},
	{ &platid_mask_MACH_NEC_MCR_700,	&vrc4172pwm_mcr700_param},
	{ &platid_mask_MACH_NEC_MCR_700A,	&vrc4172pwm_mcr700_param},
	{ &platid_mask_MACH_NEC_MCR_730,	&vrc4172pwm_mcr700_param},
	{ &platid_mask_MACH_NEC_MCR_730A,	&vrc4172pwm_mcr700_param},
	{ NULL, NULL}
};

struct vrc4172pwm_softc *this_pwm;

static inline void
vrc4172pwm_write(struct vrc4172pwm_softc *sc, int port, unsigned short val)
{

	bus_space_write_2(sc->sc_iot, sc->sc_ioh, port, val);
}

static inline unsigned short
vrc4172pwm_read(struct vrc4172pwm_softc *sc, int port)
{

	return (bus_space_read_2(sc->sc_iot, sc->sc_ioh, port));
}

static int
vrc4172pwmprobe(device_t parent, cfdata_t cf, void *aux)
{
	platid_mask_t mask;
	struct vrip_attach_args *va = aux;
	bus_space_handle_t ioh;
#ifdef VRC4172PWM_BROKEN_PROBE
	int probe = 0;
#else /* VRC4172PWM_BROKEN_PROBE */
	int probe = 1;
#endif /* VRC4172PWM_BROKEN_PROBE */
	int data;
	int data2;
	struct vrc4172pwm_param *param;
	int ret = 0;

	if (va->va_addr == VRIPIFCF_ADDR_DEFAULT)
		return (0);
 
	if (cf->cf_loc[VRIPIFCF_PLATFORM] == 0)
		return (0);
	if (cf->cf_loc[VRIPIFCF_PLATFORM] != -1) { /* if specify */
		mask = PLATID_DEREF(cf->cf_loc[VRIPIFCF_PLATFORM]);
		VPRINTF(("vrc4172pwmprobe: check platid\n"));
		if (platid_match(&platid, &mask) == 0)	
			return (0);
		param = vrc4172pwm_getparam();
		if (param != NULL && param->brokenprobe)
			probe = 0;
	}
	if (probe) {
		if (bus_space_map(va->va_iot, va->va_addr, va->va_size, 0,
		    &ioh)) {
			return (0);
		}
		data =  bus_space_read_2(va->va_iot, ioh, VRC2_PWM_LCDDUTYEN);
		bus_space_write_2(va->va_iot, ioh, VRC2_PWM_LCDDUTYEN, 0xff);
		if ((data2 = bus_space_read_2(va->va_iot, ioh,
		    VRC2_PWM_LCDDUTYEN)) == VRC2_PWM_LCDEN_MASK) {
			VPRINTF(("vrc4172pwmprobe:"
			    " VRC2_PWM_LCDDUTYEN found\n"));
			ret = 1;
		} else {
			VPRINTF(("vrc4172pwmprobe: VRC2_PWM_LCDDUTYEN"
			    " not found org=%x, data=%x!=%x\n",
			    data, data2, VRC2_PWM_LCDEN_MASK));
		}
		bus_space_write_2(va->va_iot, ioh, VRC2_PWM_LCDDUTYEN, data);
		bus_space_unmap(va->va_iot, ioh, va->va_size);
	} else
		ret = 1;
	VPRINTF(("vrc4172pwmprobe: return %d\n", ret));

	return (ret);
}

static void
vrc4172pwmattach(device_t parent, device_t self, void *aux)
{
	struct vrc4172pwm_softc *sc = device_private(self);
	struct vrip_attach_args *va = aux;

	bus_space_tag_t iot = va->va_iot;
	bus_space_handle_t ioh;

	if (bus_space_map(iot, va->va_addr, 1, 0, &ioh)) {
		printf(": can't map bus space\n");
		return;
	}

	sc->sc_iot = iot;
	sc->sc_ioh = ioh;

	printf("\n");

	VDUMPREG(sc);
	/* basic setup */
	sc->sc_pmhook = config_hook(CONFIG_HOOK_PMEVENT,
	    CONFIG_HOOK_PMEVENT_HARDPOWER, CONFIG_HOOK_SHARE,
	    vrc4172pwm_pmevent, sc);
	sc->sc_lcdhook = config_hook(CONFIG_HOOK_POWERCONTROL,
	    CONFIG_HOOK_POWERCONTROL_LCDLIGHT, CONFIG_HOOK_SHARE,
	    vrc4172pwm_event, sc);
	sc->sc_getlcdhook = config_hook(CONFIG_HOOK_GET,
	    CONFIG_HOOK_POWER_LCDLIGHT, CONFIG_HOOK_SHARE,
	    vrc4172pwm_event, sc);
	sc->sc_sethook = config_hook(CONFIG_HOOK_SET,
	    CONFIG_HOOK_BRIGHTNESS, CONFIG_HOOK_SHARE,
	    vrc4172pwm_event, sc);
	sc->sc_gethook = config_hook(CONFIG_HOOK_GET,
	    CONFIG_HOOK_BRIGHTNESS, CONFIG_HOOK_SHARE,
	    vrc4172pwm_event, sc);
	sc->sc_getmaxhook = config_hook(CONFIG_HOOK_GET,
	    CONFIG_HOOK_BRIGHTNESS_MAX, CONFIG_HOOK_SHARE,
	    vrc4172pwm_event, sc);

	vrc4172pwm_init_brightness(sc);
	if (sc->sc_param == NULL)
		printf("vrc4172pwm: NO parameter found. DISABLE pwm control\n");
	this_pwm = sc;
}

/* 
 * get platform related brightness paramerters
 */
struct vrc4172pwm_param *
vrc4172pwm_getparam(void)
{
	struct platid_data *p;

	if ((p = platid_search_data(&platid, vrc4172pwm_platid_param_table)))
		return (p->data);

	return (NULL);
}

/*
 *
 * Initialize PWM brightness parameters
 *
 */
void
vrc4172pwm_init_brightness(struct vrc4172pwm_softc *sc)
{
	sc->sc_param = vrc4172pwm_getparam();
	sc->sc_raw_freq = vrc4172pwm_read(sc, VRC2_PWM_LCDFREQ);
	sc->sc_raw_duty = vrc4172pwm_read(sc, VRC2_PWM_LCDDUTY);
	sc->sc_brightness = vrc4172pwm_rawduty2brightness(sc);
	sc->sc_light = vrc4172pwm_get_light(sc);
	DPRINTF(("vrc4172pwm_init_brightness: param=0x%x, freq=0x%x,"
	    " duty=0x%x, blightness=%d light=%d\n", (int)sc->sc_param,
	    sc->sc_raw_freq, sc->sc_raw_duty, sc->sc_brightness,
	    sc->sc_light));
}
/*
 * backlight on/off
 */
void
vrc4172pwm_light(struct vrc4172pwm_softc *sc, int on)
{
	int brightness;

	DPRINTF(("vrc4172pwm_light: %s\n", on?"ON":"OFF"));
	if (on) {
		vrc4172pwm_set_brightness(sc, sc->sc_brightness);
		vrc4172pwm_write(sc, VRC2_PWM_LCDDUTYEN, VRC2_PWM_LCD_EN);
	} else {
		brightness = sc->sc_brightness; /* save */
		vrc4172pwm_set_brightness(sc, 0);
		/* need this, break sc->sc_brightness */
		sc->sc_brightness = brightness; /* resume */
		vrc4172pwm_write(sc, VRC2_PWM_LCDDUTYEN, VRC2_PWM_LCD_DIS);
	}
	sc->sc_light = on;
}

/*
 * get backlight on/off
 */
int
vrc4172pwm_get_light(struct vrc4172pwm_softc *sc)
{

	return (VRC2_PWM_LCDEN_MASK&vrc4172pwm_read(sc, VRC2_PWM_LCDDUTYEN));
}

/*
 * set brightness
 */
void
vrc4172pwm_set_brightness(struct vrc4172pwm_softc *sc, int val)
{
	int raw;

	if (sc->sc_param == NULL)
		return;
	if (val < 0)
		val = 0;
	if (val > VRC2_PWM_MAX_BRIGHTNESS)
		val = VRC2_PWM_MAX_BRIGHTNESS;
	if (val > sc->sc_param->n_brightness)
		val = sc->sc_param->n_brightness;
	sc->sc_brightness = val;
	raw = vrc4172pwm_brightness2rawduty(sc);
	vrc4172pwm_write(sc, VRC2_PWM_LCDDUTY, raw);
	DPRINTF(("vrc4172pwm_set_brightness: val=%d raw=0x%x\n", val, raw));
}

/*
 * get brightness
 */
int
vrc4172pwm_get_brightness(struct vrc4172pwm_softc *sc)
{

	if (sc->sc_param == NULL)
		return (VRC2_PWM_MAX_BRIGHTNESS);

	return (sc->sc_brightness);
}

/*
 * PWM duty to brightness
 */
int
vrc4172pwm_rawduty2brightness(struct vrc4172pwm_softc *sc)
{
	int i;

	if (sc->sc_param == NULL)
		return (VRC2_PWM_MAX_BRIGHTNESS);
	for (i = 0; i < sc->sc_param->n_brightness; i++) {
		if (sc->sc_raw_duty <= sc->sc_param->bvalues[i])
			break;
	}
	if (i >= sc->sc_param->n_brightness-1)
		return (sc->sc_param->n_brightness-1);
	else
		return (i);

}

/*
 * brightness to raw duty
 */
int
vrc4172pwm_brightness2rawduty(struct vrc4172pwm_softc *sc)
{

	if (sc->sc_param == NULL)
		return (VRC2_PWM_LCDDUTY_MASK);

	return (sc->sc_param->bvalues[sc->sc_brightness]);
}


/*
 * PWM config hook events 
 *
 */
int
vrc4172pwm_event(void *ctx, int type, long id, void *msg)
{
	struct vrc4172pwm_softc *sc = (struct vrc4172pwm_softc *)ctx;
        int why =(int)msg;

	if (type == CONFIG_HOOK_POWERCONTROL 
	    && id == CONFIG_HOOK_POWERCONTROL_LCDLIGHT) {
		DPRINTF(("vrc4172pwm:POWERCONTROL_LCDLIGHT: %d\n", why));
		vrc4172pwm_light(sc, why);
	} else if (type == CONFIG_HOOK_GET
	    && id == CONFIG_HOOK_POWER_LCDLIGHT) {
		*(int *)msg = vrc4172pwm_get_light(sc);
		DPRINTF(("vrc4172pwm:GET LCDLIGHT: %d\n", *(int *)msg));
	} else if (type == CONFIG_HOOK_GET
	    && id == CONFIG_HOOK_BRIGHTNESS) {
		*(int *)msg = vrc4172pwm_get_brightness(sc);
		DPRINTF(("vrc4172pwm:GET BRIGHTNESS: %d\n", *(int *)msg));
	} else if (type == CONFIG_HOOK_GET
	    && id == CONFIG_HOOK_BRIGHTNESS_MAX) {
		if (sc->sc_param == NULL)
			*(int *)msg = VRC2_PWM_MAX_BRIGHTNESS;
		else
			*(int *)msg = sc->sc_param->n_brightness-1;
		DPRINTF(("vrc4172pwm:GET MAX BRIGHTNESS: %d\n", *(int *)msg));
	} else if (type == CONFIG_HOOK_SET
	    && id == CONFIG_HOOK_BRIGHTNESS) {
		DPRINTF(("vrc4172pwm:SET BRIGHTNESS: %d\n", *(int *)msg));
		vrc4172pwm_set_brightness(sc, *(int *)msg);
	} else {
		DPRINTF(("vrc4172pwm:unknown event: type %d id %ld\n",
		    type, id));
		return (1);
	}
	
        return (0);
}

/*
 * PWM config hook events 
 *
 */
int
vrc4172pwm_pmevent(void *ctx, int type, long id, void *msg)
{
	struct vrc4172pwm_softc *sc = (struct vrc4172pwm_softc *)ctx;
        int why =(int)msg;

	if (type != CONFIG_HOOK_PMEVENT)
		return (1);
		
        switch (why) {
	case PWR_STANDBY:
	case PWR_SUSPEND:
		sc->sc_light_save = sc->sc_light;
		vrc4172pwm_light(sc, 0);
		break;
	case PWR_RESUME:
		vrc4172pwm_light(sc, sc->sc_light_save);
		break;
	default:
		return (1);
        }

        return (0);
}

/*
 * dump pwm registers
 */
void
vrc4172pwm_dumpreg(struct vrc4172pwm_softc *sc)
{
	int en, freq, duty;

	en = vrc4172pwm_read(sc, VRC2_PWM_LCDDUTYEN);
	freq = vrc4172pwm_read(sc, VRC2_PWM_LCDFREQ);
	duty = vrc4172pwm_read(sc, VRC2_PWM_LCDDUTY);

	printf("vrc4172pwm: dumpreg: lightenable = %d,"
	    " freq = 0x%x, duty = 0x%x\n", en, freq, duty);
}

/* end */