NetBSD/sys/arch/dreamcast/dev/gdrom.c

/*	$NetBSD: gdrom.c,v 1.15 2002/11/15 13:29:26 itohy Exp $	*/

/*-
 * Copyright (c) 2001 Marcus Comstedt
 * 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 Marcus Comstedt.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 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>			/* RCS ID & Copyright macro defns */

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

#include <sys/buf.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <sys/cdio.h>
#include <sys/proc.h>
#include <sys/conf.h>

#include <machine/sysasicvar.h>

int	gdrommatch(struct device *, struct cfdata *, void *);
void	gdromattach(struct device *, struct device *, void *);

dev_type_open(gdromopen);
dev_type_close(gdromclose);
dev_type_read(gdromread);
dev_type_write(gdromwrite);
dev_type_ioctl(gdromioctl);
dev_type_strategy(gdromstrategy);

const struct bdevsw gdrom_bdevsw = {
	gdromopen, gdromclose, gdromstrategy, gdromioctl, nodump,
	nosize, D_DISK
};

const struct cdevsw gdrom_cdevsw = {
	gdromopen, gdromclose, gdromread, gdromwrite, gdromioctl,
	nostop, notty, nopoll, nommap, nokqfilter, D_DISK
};

struct gdrom_softc {
	struct device sc_dv;	/* generic device info; must come first */
	struct disk dkdev;	/* generic disk info */
	struct buf curbuf;	/* state of current I/O operation */

	int is_open, is_busy;
	int openpart_start;	/* start sector of currently open partition */

	int cmd_active;
	void *cmd_result_buf;	/* where to store result data (16 bit aligned) */
	int cmd_result_size;	/* number of bytes allocated for buf */
	int cmd_actual;		/* number of bytes actually read */
	int cmd_cond;		/* resulting condition of command */
};

CFATTACH_DECL(gdrom, sizeof(struct gdrom_softc),
    gdrommatch, gdromattach, NULL, NULL);

struct dkdriver gdromdkdriver = { gdromstrategy };

extern struct cfdriver gdrom_cd;


struct gd_toc {
	unsigned int entry[99];
	unsigned int first, last;
	unsigned int leadout;
};

#define TOC_LBA(n)	((n) & 0xffffff00)
#define TOC_ADR(n)	((n) & 0x0f)
#define TOC_CTRL(n)	(((n) & 0xf0) >> 4)
#define TOC_TRACK(n)	(((n) & 0x0000ff00) >> 8)

#define GDROM(o)	(*(volatile unsigned char *)(0xa05f7000 + (o)))

#define GDSTATSTAT(n)	((n) & 0xf)
#define GDSTATDISK(n)	(((n) >> 4) & 0xf)

#define GDROM_BUSY	GDROM(0x18)
#define GDROM_DATA	(*(volatile short *) & GDROM(0x80))
#define GDROM_REGX	GDROM(0x84)
#define GDROM_STAT	GDROM(0x8c)
#define GDROM_CNTLO	GDROM(0x90)
#define GDROM_CNTHI	GDROM(0x94)
#define GDROM_COND	GDROM(0x9c)

int	gdrom_getstat(void);
int	gdrom_do_command(struct gdrom_softc *, void *, void *, unsigned int);
int	gdrom_command_sense(struct gdrom_softc *, void *, void *, unsigned int);
int	gdrom_read_toc(struct gdrom_softc *, struct gd_toc *);
int	gdrom_read_sectors(struct gdrom_softc *, void *, int, int);
int	gdrom_mount_disk(struct gdrom_softc *);
int	gdrom_intr(void *);

int gdrom_getstat()
{
	int s1, s2, s3;

	if (GDROM_BUSY & 0x80)
		return (-1);
	s1 = GDROM_STAT;
	s2 = GDROM_STAT;
	s3 = GDROM_STAT;
	if(GDROM_BUSY & 0x80)
		return (-1);
	if(s1 == s2)
		return (s1);
	else if(s2 == s3)
		return (s2);
	else
		return (-1);
}

int
gdrom_intr(void *arg)
{
	struct gdrom_softc *sc = arg;
	int s, cond;

	s = splbio();
	cond = GDROM_COND;
#ifdef GDROMDEBUG
	printf("GDROM: cond = %x\n", cond);
#endif
	if(!sc->cmd_active) {
#ifdef GDROMDEBUG
		printf("GDROM: inactive IRQ!?\n");
#endif
		splx(s);
		return (0);
	}

	if((cond & 8)) {
		int cnt = (GDROM_CNTHI << 8) | GDROM_CNTLO;
#ifdef GDROMDEBUG
		printf("GDROM: cnt = %d\n", cnt);
#endif
		sc->cmd_actual += cnt;
		if(cnt > 0 && sc->cmd_result_size > 0) {
			int subcnt = (cnt > sc->cmd_result_size ?
			    sc->cmd_result_size : cnt);
			int16_t *ptr = sc->cmd_result_buf;
			sc->cmd_result_buf = ((char *)sc->cmd_result_buf) +
			    subcnt;
			sc->cmd_result_size -= subcnt;
			cnt -= subcnt;
			while (subcnt > 0) {
				*ptr++ = GDROM_DATA;
				subcnt -= 2;
			}
		}
		while (cnt > 0) {
			__volatile int16_t tmp;
			tmp = GDROM_DATA;
			cnt -= 2;
		}
	}
	while (GDROM_BUSY & 0x80);
	
	if ((cond & 8) == 0) {
		sc->cmd_cond = cond;
		sc->cmd_active = 0;
		wakeup(&sc->cmd_active);
	}

	splx(s);
	return (1);
}


int gdrom_do_command(struct gdrom_softc *sc, void *req, void *buf,
    unsigned int nbyt)
{
	int i, s;
	short *ptr = req;

	while (GDROM_BUSY & 0x88)
		;
	if (buf != NULL) {
		GDROM_CNTLO = nbyt & 0xff;
		GDROM_CNTHI = (nbyt >> 8) & 0xff;
		GDROM_REGX = 0;
	}
	sc->cmd_result_buf = buf;
	sc->cmd_result_size = nbyt;

	if (GDSTATSTAT(GDROM_STAT) == 6)
		return (-1);
	
	GDROM_COND = 0xa0;
	for (i = 0; i < 64; i++)
		;
	while ((GDROM_BUSY & 0x88) != 8)
		;

	s = splbio();

	sc->cmd_actual = 0;
	sc->cmd_active = 1;

	for (i = 0; i< 6; i++)
		GDROM_DATA = ptr[i];
	
	while (sc->cmd_active)
		tsleep(&sc->cmd_active, PRIBIO, "gdrom", 0);

	splx(s);

	return (sc->cmd_cond);
}


int gdrom_command_sense(struct gdrom_softc *sc, void *req, void *buf,
    unsigned int nbyt)
{
	/* 76543210 76543210
	   0   0x13      -
	   2    -      bufsz(hi)
	   4 bufsz(lo)   -
	   6    -        -
	   8    -        -
	   10    -        -        */
	unsigned short sense_data[5];
	unsigned char cmd[12];
	int sense_key, sense_specific;

	int cond = gdrom_do_command(sc, req, buf, nbyt);

	if (cond < 0) {
#ifdef GDROMDEBUG
		printf("GDROM: not ready (2:58)\n");
#endif
		return (EIO);
	}
	
	if ((cond & 1) == 0) {
#ifdef GDROMDEBUG
		printf("GDROM: no sense.  0:0\n");
#endif
		return (0);
	}
	
	memset(cmd, 0, sizeof(cmd));
	
	cmd[0] = 0x13;
	cmd[4] = sizeof(sense_data);
	
	gdrom_do_command(sc, cmd, sense_data, sizeof(sense_data));
	
	sense_key = sense_data[1] & 0xf;
	sense_specific = sense_data[4];
	if (sense_key == 11 && sense_specific == 0) {
#ifdef GDROMDEBUG
		printf("GDROM: aborted (ignored).  0:0\n");
#endif
		return (0);
	}
	
#ifdef GDROMDEBUG
	printf("GDROM: SENSE %d:", sense_key);
	printf("GDROM: %d\n", sense_specific);
#endif
	
	return (sense_key == 0 ? 0 : EIO);
}

int gdrom_read_toc(struct gdrom_softc *sc, struct gd_toc *toc)
{
	/* 76543210 76543210
	   0   0x14      -
	   2    -      bufsz(hi)
	   4 bufsz(lo)   -
	   6    -        -
	   8    -        -
	   10    -        -        */
	unsigned char cmd[12];

	memset(cmd, 0, sizeof(cmd));
	
	cmd[0] = 0x14;
	cmd[3] = sizeof(struct gd_toc) >> 8;
	cmd[4] = sizeof(struct gd_toc) & 0xff;
	
	return (gdrom_command_sense(sc, cmd, toc, sizeof(struct gd_toc)));
}

int gdrom_read_sectors(struct gdrom_softc *sc, void *buf, int sector, int cnt)
{
	/* 76543210 76543210
	   0   0x30    datafmt
	   2  sec(hi)  sec(mid)
	   4  sec(lo)    -
	   6    -        -
	   8  cnt(hi)  cnt(mid)
	   10  cnt(lo)    -        */
	unsigned char cmd[12];

	memset(cmd, 0, sizeof(cmd));

	cmd[0] = 0x30;
	cmd[1] = 0x20;
	cmd[2] = sector>>16;
	cmd[3] = sector>>8;
	cmd[4] = sector;
	cmd[8] = cnt>>16;
	cmd[9] = cnt>>8;
	cmd[10] = cnt;

	return (gdrom_command_sense(sc, cmd, buf, cnt << 11));
}

int gdrom_mount_disk(struct gdrom_softc *sc)
{
	/* 76543210 76543210
	   0   0x70      -
	   2   0x1f      -
	   4    -        -
	   6    -        -
	   8    -        -
	   10    -        -        */
	unsigned char cmd[12];

	memset(cmd, 0, sizeof(cmd));
	
	cmd[0] = 0x70;
	cmd[1] = 0x1f;
	
	return (gdrom_command_sense(sc, cmd, NULL, 0));
}

int
gdrommatch(struct device *parent, struct cfdata *cf, void *aux)
{
	static int gdrom_matched = 0;

	/* Allow only once instance. */
	if (gdrom_matched)
		return (0);
	gdrom_matched = 1;

	return (1);
}

void
gdromattach(struct device *parent, struct device *self, void *aux)
{
	struct gdrom_softc *sc;
	u_int32_t p, x;

	sc = (struct gdrom_softc *)self;

	/*
	 * Initialize and attach the disk structure.
	 */
	sc->dkdev.dk_name = sc->sc_dv.dv_xname;
	sc->dkdev.dk_driver = &gdromdkdriver;
	disk_attach(&sc->dkdev);

	/*
	 * reenable disabled drive
	 */
	*((__volatile u_int32_t *)0xa05f74e4) = 0x1fffff;
	for (p = 0; p < 0x200000 / 4; p++)
		x = ((__volatile u_int32_t *)0xa0000000)[p];

	printf(": %s\n", sysasic_intr_string(IPL_BIO));
	sysasic_intr_establish(SYSASIC_EVENT_GDROM, IPL_BIO, gdrom_intr, sc);
}

int
gdromopen(dev_t dev, int flags, int devtype, struct proc *p)
{
	struct gdrom_softc *sc;
	int s, error, unit, cnt;
	struct gd_toc toc;

#ifdef GDROMDEBUG
	printf("GDROM: open\n");
#endif

	unit = DISKUNIT(dev);
	if (unit >= gdrom_cd.cd_ndevs)
		return (ENXIO);

	sc = gdrom_cd.cd_devs[unit];
	if (sc == NULL)
		return (ENXIO);

	if (sc->is_open)
		return (EBUSY);

	s = splbio();
	while(sc->is_busy)
		tsleep(&sc->is_busy, PRIBIO, "gdbusy", 0);
	sc->is_busy = 1;
	splx(s);

	for (cnt = 0; cnt < 5; cnt++)
		if ((error = gdrom_mount_disk(sc)) == 0)
			break;

	if (!error)
		error = gdrom_read_toc(sc, &toc);

	sc->is_busy = 0;
	wakeup(&sc->is_busy);

	if (error)
		return error;

	sc->is_open = 1;
	sc->openpart_start = 150;

#ifdef GDROMDEBUG
	printf("GDROM: open OK\n");
#endif
	return (0);
}

int
gdromclose(dev_t dev, int flags, int devtype, struct proc *p)
{
	struct gdrom_softc *sc;
	int unit;
#ifdef GDROMDEBUG
	printf("GDROM: close\n");
#endif
	unit = DISKUNIT(dev);
	sc = gdrom_cd.cd_devs[unit];

	sc->is_open = 0;

	return (0);
}

void
gdromstrategy(struct buf *bp)
{
	struct gdrom_softc *sc;
	int s, unit, error;
#ifdef GDROMDEBUG
	printf("GDROM: strategy\n");
#endif
	
	unit = DISKUNIT(bp->b_dev);
	sc = gdrom_cd.cd_devs[unit];

	if (bp->b_bcount == 0)
		goto done;

	bp->b_rawblkno = bp->b_blkno / (2048 / DEV_BSIZE) + sc->openpart_start;

#ifdef GDROMDEBUG
	printf("GDROM: read_sectors(%p, %d, %ld) [%ld bytes]\n",
	    bp->b_data, bp->b_rawblkno,
	    bp->b_bcount>>11, bp->b_bcount);
#endif
	s = splbio();
	while (sc->is_busy)
		tsleep(&sc->is_busy, PRIBIO, "gdbusy", 0);
	sc->is_busy = 1;
	splx(s);

	if ((error = gdrom_read_sectors(sc, bp->b_data, bp->b_rawblkno,
	    bp->b_bcount >> 11))) {
		bp->b_error = error;
		bp->b_flags |= B_ERROR;
	}

	sc->is_busy = 0;
	wakeup(&sc->is_busy);

 done:
	bp->b_resid = bp->b_bcount;
	biodone(bp);
}

int
gdromioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
{
	struct gdrom_softc *sc;
	int unit, error;
#ifdef GDROMDEBUG
	printf("GDROM: ioctl %lx\n", cmd);
#endif

	unit = DISKUNIT(dev);
	sc = gdrom_cd.cd_devs[unit];

	switch (cmd) {
	case CDIOREADMSADDR: {
		int s, track, sessno = *(int *)addr;
		struct gd_toc toc;

		if (sessno != 0)
			return (EINVAL);

		s = splbio();
		while (sc->is_busy)
			tsleep(&sc->is_busy, PRIBIO, "gdbusy", 0);
		sc->is_busy = 1;
		splx(s);

		error = gdrom_read_toc(sc, &toc);

		sc->is_busy = 0;
		wakeup(&sc->is_busy);

		if (error)
			return error;

		for (track = TOC_TRACK(toc.last);
		    track >= TOC_TRACK(toc.first);
		    --track)
			if (TOC_CTRL(toc.entry[track-1]))
				break;

		if (track < TOC_TRACK(toc.first) || track > 100)
			return (ENXIO);

		*(int *)addr = htonl(TOC_LBA(toc.entry[track-1])) -
		    sc->openpart_start;

		return (0);
	}
	default:
		return (EINVAL);
	}

#ifdef DIAGNOSTIC
	panic("gdromioctl: impossible");
#endif
}


int
gdromread(dev_t dev, struct uio *uio, int flags)
{
#ifdef GDROMDEBUG
	printf("GDROM: read\n");
#endif
	return (physio(gdromstrategy, NULL, dev, B_READ, minphys, uio));
}

int
gdromwrite(dev_t dev, struct uio *uio, int flags)
{

	return (EROFS);
}