NetBSD/sys/dev/pcmcia/pcmcia.c

/*	$NetBSD: pcmcia.c,v 1.52 2004/08/09 20:02:36 mycroft Exp $	*/

/*
 * Copyright (c) 2004 Charles M. Hannum.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Charles M. Hannum.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 */

/*
 * Copyright (c) 1997 Marc Horowitz.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Marc Horowitz.
 * 4. The name of the author may not 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 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: pcmcia.c,v 1.52 2004/08/09 20:02:36 mycroft Exp $");

#include "opt_pcmciaverbose.h"

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

#include <dev/pcmcia/pcmciareg.h>
#include <dev/pcmcia/pcmciachip.h>
#include <dev/pcmcia/pcmciavar.h>
#ifdef IT8368E_LEGACY_MODE /* XXX -uch */
#include <arch/hpcmips/dev/it8368var.h>
#endif

#include "locators.h"

#ifdef PCMCIADEBUG
int	pcmcia_debug = 0;
#define	DPRINTF(arg) if (pcmcia_debug) printf arg
#else
#define	DPRINTF(arg)
#endif

#ifdef PCMCIAVERBOSE
int	pcmcia_verbose = 1;
#else
int	pcmcia_verbose = 0;
#endif

int	pcmcia_match __P((struct device *, struct cfdata *, void *));
int	pcmcia_submatch __P((struct device *, struct cfdata *, void *));
void	pcmcia_attach __P((struct device *, struct device *, void *));
int	pcmcia_print __P((void *, const char *));

CFATTACH_DECL(pcmcia, sizeof(struct pcmcia_softc),
    pcmcia_match, pcmcia_attach, NULL, NULL);

int
pcmcia_ccr_read(pf, ccr)
	struct pcmcia_function *pf;
	int ccr;
{

	return (bus_space_read_1(pf->pf_ccrt, pf->pf_ccrh,
	    pf->pf_ccr_offset + ccr * 2));
}

void
pcmcia_ccr_write(pf, ccr, val)
	struct pcmcia_function *pf;
	int ccr;
	int val;
{

	if (pf->ccr_mask & (1 << ccr)) {
		bus_space_write_1(pf->pf_ccrt, pf->pf_ccrh,
		    pf->pf_ccr_offset + ccr * 2, val);
	}
}

int
pcmcia_match(parent, match, aux)
	struct device *parent;
	struct cfdata *match;
	void *aux;
{
	struct pcmciabus_attach_args *paa = aux;

	if (strcmp(paa->paa_busname, match->cf_name)) {
	    return 0;
	}
	/* if the autoconfiguration got this far, there's a socket here */
	return (1);
}

void
pcmcia_attach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct pcmciabus_attach_args *paa = aux;
	struct pcmcia_softc *sc = (struct pcmcia_softc *) self;

	printf("\n");

	sc->pct = paa->pct;
	sc->pch = paa->pch;
	sc->iobase = paa->iobase;
	sc->iosize = paa->iosize;

	sc->ih = NULL;
}

int
pcmcia_card_attach(dev)
	struct device *dev;
{
	struct pcmcia_softc *sc = (struct pcmcia_softc *) dev;
	struct pcmcia_function *pf;
	struct pcmcia_attach_args paa;
	int attached;

	/*
	 * this is here so that when socket_enable calls gettype, trt happens
	 */
	SIMPLEQ_FIRST(&sc->card.pf_head) = NULL;

	pcmcia_chip_socket_enable(sc->pct, sc->pch);

	pcmcia_read_cis(sc);

	pcmcia_chip_socket_disable(sc->pct, sc->pch);

	pcmcia_check_cis_quirks(sc);

	/*
	 * bail now if the card has no functions, or if there was an error in
	 * the cis.
	 */

	if (sc->card.error)
		return (1);
	if (SIMPLEQ_EMPTY(&sc->card.pf_head))
		return (1);

	if (pcmcia_verbose)
		pcmcia_print_cis(sc);

	attached = 0;

	SIMPLEQ_FOREACH(pf, &sc->card.pf_head, pf_list) {
		if (SIMPLEQ_EMPTY(&pf->cfe_head))
			continue;

#ifdef DIAGNOSTIC
		if (pf->child != NULL) {
			printf("%s: %s still attached to function %d!\n",
			    sc->dev.dv_xname, pf->child->dv_xname,
			    pf->number);
			panic("pcmcia_card_attach");
		}
#endif
		pf->sc = sc;
		pf->child = NULL;
		pf->cfe = NULL;
		pf->pf_ih = NULL;
	}

	SIMPLEQ_FOREACH(pf, &sc->card.pf_head, pf_list) {
		if (SIMPLEQ_EMPTY(&pf->cfe_head))
			continue;

		paa.manufacturer = sc->card.manufacturer;
		paa.product = sc->card.product;
		paa.card = &sc->card;
		paa.pf = pf;

		if ((pf->child = config_found_sm(&sc->dev, &paa, pcmcia_print,
		    pcmcia_submatch)) != NULL)
			attached++;
	}

	return (attached ? 0 : 1);
}

void
pcmcia_card_detach(dev, flags)
	struct device *dev;
	int flags;		/* DETACH_* flags */
{
	struct pcmcia_softc *sc = (struct pcmcia_softc *) dev;
	struct pcmcia_function *pf;
	int error;

	/*
	 * We are running on either the PCMCIA socket's event thread
	 * or in user context detaching a device by user request.
	 */
	SIMPLEQ_FOREACH(pf, &sc->card.pf_head, pf_list) {
		if (SIMPLEQ_EMPTY(&pf->cfe_head))
			continue;
		if (pf->child == NULL)
			continue;
		DPRINTF(("%s: detaching %s (function %d)\n",
		    sc->dev.dv_xname, pf->child->dv_xname, pf->number));
		if ((error = config_detach(pf->child, flags)) != 0) {
			printf("%s: error %d detaching %s (function %d)\n",
			    sc->dev.dv_xname, error, pf->child->dv_xname,
			    pf->number);
		} else
			pf->child = NULL;
	}
}

void
pcmcia_card_deactivate(dev)
	struct device *dev;
{
	struct pcmcia_softc *sc = (struct pcmcia_softc *) dev;
	struct pcmcia_function *pf;

	/*
	 * We're in the chip's card removal interrupt handler.
	 * Deactivate the child driver.  The PCMCIA socket's
	 * event thread will run later to finish the detach.
	 */
	SIMPLEQ_FOREACH(pf, &sc->card.pf_head, pf_list) {
		if (SIMPLEQ_EMPTY(&pf->cfe_head))
			continue;
		if (pf->child == NULL)
			continue;
		DPRINTF(("%s: deactivating %s (function %d)\n",
		    sc->dev.dv_xname, pf->child->dv_xname, pf->number));
		config_deactivate(pf->child);
	}
}

int
pcmcia_submatch(parent, cf, aux)
	struct device *parent;
	struct cfdata *cf;
	void *aux;
{
	struct pcmcia_attach_args *paa = aux;

	if (cf->cf_loc[PCMCIACF_FUNCTION] != PCMCIACF_FUNCTION_DEFAULT &&
	    cf->cf_loc[PCMCIACF_FUNCTION] != paa->pf->number)
		return (0);

	return (config_match(parent, cf, aux));
}

int
pcmcia_print(arg, pnp)
	void *arg;
	const char *pnp;
{
	struct pcmcia_attach_args *pa = arg;
	struct pcmcia_softc *sc = pa->pf->sc;
	struct pcmcia_card *card = &sc->card;
	char devinfo[256];

	if (pnp)
		aprint_normal("%s", pnp);

	pcmcia_devinfo(card, !!pnp, devinfo, sizeof(devinfo));

	aprint_normal(" function %d: %s", pa->pf->number, devinfo);

	return (UNCONF);
}

void
pcmcia_devinfo(card, showhex, cp, cplen)
	struct pcmcia_card *card;
	int showhex;
	char *cp;
	size_t cplen;
{
	int i, n;

	if (cplen > 1) {
		*cp++ = '<';
		*cp = '\0';
		cplen--;
	}

	for (i = 0; i < 4 && card->cis1_info[i] != NULL && cplen > 1; i++) {
		n = snprintf(cp, cplen, "%s%s", i ? ", " : "",
		        card->cis1_info[i]);
		cp += n;
		if (cplen < n)
			return;
		cplen -= n;
	}

	if (cplen > 1) {
		*cp++ = '>';
		*cp = '\0';
		cplen--;
	}

	if (showhex && cplen > 1)
		snprintf(cp, cplen, " (manufacturer 0x%04x, product 0x%04x)",
		    card->manufacturer, card->product);
}

const struct pcmcia_product *
pcmcia_product_lookup(pa, tab, ent_size, matchfn)
	struct pcmcia_attach_args *pa;
	const struct pcmcia_product *tab;
	size_t ent_size;
	pcmcia_product_match_fn matchfn;
{
        const struct pcmcia_product *ent;
	int matches;

#ifdef DIAGNOSTIC
	if (sizeof *ent > ent_size)
		panic("pcmcia_product_lookup: bogus ent_size %ld", 
		      (long) ent_size);
#endif

        for (ent = tab;
	    ent->pp_name != NULL;
	    ent = (const struct pcmcia_product *)
	      ((const char *)ent + ent_size)) {

		/* see if it matches vendor/product/function */
		matches = (pa->manufacturer == ent->pp_vendor) &&
		    (pa->product == ent->pp_product) &&
		    (pa->pf->number == ent->pp_expfunc);

		/* if a separate match function is given, let it override */
		if (matchfn != NULL)
			matches = (*matchfn)(pa, ent, matches);

		if (matches)
                        return (ent);
        }
        return (NULL);
}

int 
pcmcia_card_gettype(dev)
	struct device  *dev;
{
	struct pcmcia_softc *sc = (struct pcmcia_softc *)dev;
	struct pcmcia_function *pf;

	/*
	 * set the iftype to memory if this card has no functions (not yet
	 * probed), or only one function, and that is not initialized yet or
	 * that is memory.
	 */
	pf = SIMPLEQ_FIRST(&sc->card.pf_head);
	if (pf == NULL ||
	    (SIMPLEQ_NEXT(pf, pf_list) == NULL &&
	    (pf->cfe == NULL || pf->cfe->iftype == PCMCIA_IFTYPE_MEMORY)))
		return (PCMCIA_IFTYPE_MEMORY);
	else
		return (PCMCIA_IFTYPE_IO);
}

/*
 * Initialize a PCMCIA function.  May be called as long as the function is
 * disabled.
 */
void
pcmcia_function_init(pf, cfe)
	struct pcmcia_function *pf;
	struct pcmcia_config_entry *cfe;
{
	if (pf->pf_flags & PFF_ENABLED)
		panic("pcmcia_function_init: function is enabled");

	/* Remember which configuration entry we are using. */
	pf->cfe = cfe;
}

void pcmcia_socket_enable(dev)
	struct device *dev;
{
	struct pcmcia_softc *sc = (void *)dev;

	pcmcia_chip_socket_enable(sc->pct, sc->pch);
}

void pcmcia_socket_disable(dev)
	struct device *dev;
{
	struct pcmcia_softc *sc = (void *)dev;

	pcmcia_chip_socket_disable(sc->pct, sc->pch);
}

/* Enable a PCMCIA function */
int
pcmcia_function_enable(pf)
	struct pcmcia_function *pf;
{
	struct pcmcia_function *tmp;
	int reg;

	if (pf->cfe == NULL)
		panic("pcmcia_function_enable: function not initialized");

	/*
	 * Increase the reference count on the socket, enabling power, if
	 * necessary.
	 */
	if (pf->sc->sc_enabled_count++ == 0)
		pcmcia_chip_socket_enable(pf->sc->pct, pf->sc->pch);
	DPRINTF(("%s: ++enabled_count = %d\n", pf->sc->dev.dv_xname,
		 pf->sc->sc_enabled_count));

	if (pf->pf_flags & PFF_ENABLED) {
		/*
		 * Don't do anything if we're already enabled.
		 */
		return (0);
	}

	/*
	 * it's possible for different functions' CCRs to be in the same
	 * underlying page.  Check for that.
	 */

	SIMPLEQ_FOREACH(tmp, &pf->sc->card.pf_head, pf_list) {
		if ((tmp->pf_flags & PFF_ENABLED) &&
		    (pf->ccr_base >= (tmp->ccr_base - tmp->pf_ccr_offset)) &&
		    ((pf->ccr_base + PCMCIA_CCR_SIZE) <=
		     (tmp->ccr_base - tmp->pf_ccr_offset +
		      tmp->pf_ccr_realsize))) {
			pf->pf_ccrt = tmp->pf_ccrt;
			pf->pf_ccrh = tmp->pf_ccrh;
			pf->pf_ccr_realsize = tmp->pf_ccr_realsize;

			/*
			 * pf->pf_ccr_offset = (tmp->pf_ccr_offset -
			 * tmp->ccr_base) + pf->ccr_base;
			 */
			pf->pf_ccr_offset =
			    (tmp->pf_ccr_offset + pf->ccr_base) -
			    tmp->ccr_base;
			pf->pf_ccr_window = tmp->pf_ccr_window;
			break;
		}
	}

	if (tmp == NULL) {
		if (pcmcia_mem_alloc(pf, PCMCIA_CCR_SIZE, &pf->pf_pcmh))
			goto bad;

		if (pcmcia_mem_map(pf, PCMCIA_MEM_ATTR, pf->ccr_base,
		    PCMCIA_CCR_SIZE, &pf->pf_pcmh, &pf->pf_ccr_offset,
		    &pf->pf_ccr_window)) {
			pcmcia_mem_free(pf, &pf->pf_pcmh);
			goto bad;
		}
	}

	if (pcmcia_mfc(pf->sc)) {
		pcmcia_ccr_write(pf, PCMCIA_CCR_IOBASE0,
				 (pf->pf_mfc_iobase[0] >> 0) & 0xff);
		pcmcia_ccr_write(pf, PCMCIA_CCR_IOBASE1,
				 (pf->pf_mfc_iobase[0] >> 8) & 0xff);
		pcmcia_ccr_write(pf, PCMCIA_CCR_IOBASE2,
				 (pf->pf_mfc_iobase[1] >> 0) & 0xff);
		pcmcia_ccr_write(pf, PCMCIA_CCR_IOBASE3,
				 (pf->pf_mfc_iobase[1] >> 8) & 0xff);
		pcmcia_ccr_write(pf, PCMCIA_CCR_IOSIZE, pf->pf_mfc_iomask);
	}

	reg = (pf->cfe->number & PCMCIA_CCR_OPTION_CFINDEX);
	reg |= PCMCIA_CCR_OPTION_LEVIREQ;
	if (pcmcia_mfc(pf->sc)) {
		reg |= (PCMCIA_CCR_OPTION_FUNC_ENABLE |
			PCMCIA_CCR_OPTION_ADDR_DECODE);
		if (pf->pf_ih)
			reg |= PCMCIA_CCR_OPTION_IREQ_ENABLE;

	}
	pcmcia_ccr_write(pf, PCMCIA_CCR_OPTION, reg);

	reg = 0;
	if ((pf->cfe->flags & PCMCIA_CFE_IO16) == 0)
		reg |= PCMCIA_CCR_STATUS_IOIS8;
	if (pf->cfe->flags & PCMCIA_CFE_AUDIO)
		reg |= PCMCIA_CCR_STATUS_AUDIO;
	pcmcia_ccr_write(pf, PCMCIA_CCR_STATUS, reg);

	pcmcia_ccr_write(pf, PCMCIA_CCR_SOCKETCOPY, 0);

#ifdef PCMCIADEBUG
	if (pcmcia_debug) {
		SIMPLEQ_FOREACH(tmp, &pf->sc->card.pf_head, pf_list) {
			printf("%s: function %d CCR at %d offset %lx: "
			       "%x %x %x %x, %x %x %x %x, %x\n",
			       tmp->sc->dev.dv_xname, tmp->number,
			       tmp->pf_ccr_window,
			       (unsigned long) tmp->pf_ccr_offset,
			       pcmcia_ccr_read(tmp, 0),
			       pcmcia_ccr_read(tmp, 1),
			       pcmcia_ccr_read(tmp, 2),
			       pcmcia_ccr_read(tmp, 3),

			       pcmcia_ccr_read(tmp, 5),
			       pcmcia_ccr_read(tmp, 6), 
			       pcmcia_ccr_read(tmp, 7),
			       pcmcia_ccr_read(tmp, 8),

			       pcmcia_ccr_read(tmp, 9));
		}
	}
#endif

	pf->pf_flags |= PFF_ENABLED;

#ifdef IT8368E_LEGACY_MODE
	/* return to I/O mode */
	it8368_mode(pf, IT8368_IO_MODE, IT8368_WIDTH_16);
#endif
	return (0);

 bad:
	/*
	 * Decrement the reference count, and power down the socket, if
	 * necessary.
	 */
	if (--pf->sc->sc_enabled_count == 0)
		pcmcia_chip_socket_disable(pf->sc->pct, pf->sc->pch);
	DPRINTF(("%s: --enabled_count = %d\n", pf->sc->dev.dv_xname,
		 pf->sc->sc_enabled_count));

	return (1);
}

/* Disable PCMCIA function. */
void
pcmcia_function_disable(pf)
	struct pcmcia_function *pf;
{
	struct pcmcia_function *tmp;
	int reg;

	if (pf->cfe == NULL)
		panic("pcmcia_function_enable: function not initialized");

	if ((pf->pf_flags & PFF_ENABLED) == 0) {
		/*
		 * Don't do anything but decrement if we're already disabled.
		 */
		goto out;
	}

	if (pcmcia_mfc(pf->sc)) {
		reg = pcmcia_ccr_read(pf, PCMCIA_CCR_OPTION);
		reg &= ~(PCMCIA_CCR_OPTION_FUNC_ENABLE|
			 PCMCIA_CCR_OPTION_ADDR_DECODE|
		         PCMCIA_CCR_OPTION_IREQ_ENABLE);
		pcmcia_ccr_write(pf, PCMCIA_CCR_OPTION, reg);
	}

	/*
	 * it's possible for different functions' CCRs to be in the same
	 * underlying page.  Check for that.  Note we mark us as disabled
	 * first to avoid matching ourself.
	 */

	pf->pf_flags &= ~PFF_ENABLED;
	SIMPLEQ_FOREACH(tmp, &pf->sc->card.pf_head, pf_list) {
		if ((tmp->pf_flags & PFF_ENABLED) &&
		    (pf->ccr_base >= (tmp->ccr_base - tmp->pf_ccr_offset)) &&
		    ((pf->ccr_base + PCMCIA_CCR_SIZE) <=
		(tmp->ccr_base - tmp->pf_ccr_offset + tmp->pf_ccr_realsize)))
			break;
	}

	/* Not used by anyone else; unmap the CCR. */
	if (tmp == NULL) {
		pcmcia_mem_unmap(pf, pf->pf_ccr_window);
		pcmcia_mem_free(pf, &pf->pf_pcmh);
	}

out:
	/*
	 * Decrement the reference count, and power down the socket, if
	 * necessary.
	 */
	if (--pf->sc->sc_enabled_count == 0)
		pcmcia_chip_socket_disable(pf->sc->pct, pf->sc->pch);
	DPRINTF(("%s: --enabled_count = %d\n", pf->sc->dev.dv_xname,
		 pf->sc->sc_enabled_count));
}

int
pcmcia_io_map(pf, width, pcihp, windowp)
	struct pcmcia_function *pf;
	int width;
	struct pcmcia_io_handle *pcihp;
	int *windowp;
{
	int error;

	if (pf->pf_flags & PFF_ENABLED)
		printf("pcmcia_io_map: function is enabled!\n");

	error = pcmcia_chip_io_map(pf->sc->pct, pf->sc->pch,
	    width, 0, pcihp->size, pcihp, windowp);
	if (error)
		return (error);

	/*
	 * XXX in the multifunction multi-iospace-per-function case, this
	 * needs to cooperate with io_alloc to make sure that the spaces
	 * don't overlap, and that the ccr's are set correctly
	 */

	if (pcmcia_mfc(pf->sc)) {
		int win;
		long iomask;

		/* round up to nearest (2^n)-1 */
		for (iomask = 1; iomask < pcihp->size; iomask <<= 1)
			;
		iomask--;

		win = pf->pf_mfc_windows;
		KASSERT(win < 2);
printf("win %d = addr %lx size %lx iomask %lx\n", win, (long)pcihp->addr, (long)pcihp->size, (long)iomask);
		pf->pf_mfc_iobase[win] = pcihp->addr;
		pf->pf_mfc_iomask = iomask;
	}

	return (0);
}

void
pcmcia_io_unmap(pf, window)
	struct pcmcia_function *pf;
	int window;
{

	if (pf->pf_flags & PFF_ENABLED)
		printf("pcmcia_io_unmap: function is enabled!\n");

	if (pcmcia_mfc(pf->sc)) {
		/*
		 * Don't bother trying to unmap windows in the CCR here,
		 * because we generally get called when a card has been
		 * ejected, and the CCR isn't there any more.
		 */
		--pf->pf_mfc_windows;
	}

	pcmcia_chip_io_unmap(pf->sc->pct, pf->sc->pch, window);
}

void *
pcmcia_intr_establish(pf, ipl, ih_fct, ih_arg)
	struct pcmcia_function *pf;
	int ipl;
	int (*ih_fct) __P((void *));
	void *ih_arg;
{

	if (pf->pf_flags & PFF_ENABLED)
		printf("pcmcia_intr_establish: function is enabled!\n");
	if (pf->pf_ih)
		panic("pcmcia_intr_establish: already done\n");

	pf->pf_ih = pcmcia_chip_intr_establish(pf->sc->pct, pf->sc->pch,
	    pf, ipl, ih_fct, ih_arg);
	return (pf->pf_ih);
}

void
pcmcia_intr_disestablish(pf, ih)
	struct pcmcia_function *pf;
	void *ih;
{

	if (pf->pf_flags & PFF_ENABLED)
		printf("pcmcia_intr_disestablish: function is enabled!\n");
	if (!pf->pf_ih)
		panic("pcmcia_intr_distestablish: already done\n");

	pcmcia_chip_intr_disestablish(pf->sc->pct, pf->sc->pch, ih);
	pf->pf_ih = 0;
}