/*	$NetBSD: rside.c,v 1.16 2017/10/20 07:06:05 jdolecek Exp $	*/

/*
 * Copyright (c) 2004 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 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.
 */
/*
 * Copyright (c) 1997-1998 Mark Brinicombe
 * Copyright (c) 1997-1998 Causality Limited
 *
 * 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 Mark Brinicombe
 *	for the NetBSD Project.
 * 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: rside.c,v 1.16 2017/10/20 07:06:05 jdolecek Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/bus.h>

#include <machine/intr.h>
#include <machine/io.h>
#include <acorn32/eb7500atx/rsidereg.h>
#include <machine/irqhandler.h>

#include <dev/ata/atavar.h>
#include <dev/ic/wdcvar.h>
#include <acorn32/eb7500atx/rsbus.h>

/*
 * RiscStation IDE device.
 *
 * This probes and attaches the top level IDE device to the rsbus.
 * It then configures any children of the IDE device.
 * The attach args specify whether it is configuring the primary or
 * secondary channel.
 * The children are expected to be wdc devices using rside attachments.
 *
 * The hardware notes are:
 * Two ide ports are fitted, each with registers spaced 0x40 bytes apart
 * with the extra control register at offset 0x380 from the base of the
 * port.
 *
 * Primary:
 * 	Registers at 0x302b800 (nPCCS1 + 0x0) 
 * 	IRQ connected to nEvent1 (IRQ register D)
 *
 * Secondary:
 * 	Registers at 0x302bc00 (nPCCS1 + 0x400)
 * 	IRQ connected to nEvent2 (IRQ register D)
 *
 * PIO timings can be changed by modifying the access speed register in the
 * IOMD, as there is nothing else in the nPCCS1 space.
 *
 * The Reset line is asserted by unsetting bit 4 in IO register
 * IOMD + 0x121CC.
 */

/*
 * RiscStation IDE card softc structure.
 *
 * Contains the device node, and global information required by the driver
 */

struct rside_softc {
	struct wdc_softc	sc_wdcdev;	/* common wdc definitions */
	struct ata_channel	*sc_chanarray[2]; /* channels definition */
	struct bus_space        sc_tag;			/* custom tag */
	struct rside_channel {
		struct ata_channel rc_channel;		/* generic part */
		irqhandler_t *rc_ih;			/* irq handler */
	} rside_channels[2];
	struct wdc_regs sc_wdc_regs[2];
};

static int	rside_probe	(device_t, cfdata_t, void *);
static void	rside_attach	(device_t, device_t, void *);

CFATTACH_DECL_NEW(rside, sizeof(struct rside_softc),
		rside_probe, rside_attach, NULL, NULL);

/*
 * Create an array of address structures. These define the addresses and
 * masks needed for the different channels.
 *
 * index = channel
 */

const struct {
	u_int drive_registers;
	u_int aux_register;
} rside_info[] = {
	{ PRIMARY_DRIVE_REGISTERS_POFFSET, PRIMARY_AUX_REGISTER_POFFSET },
	{ SECONDARY_DRIVE_REGISTERS_POFFSET, SECONDARY_AUX_REGISTER_POFFSET }
};

/*
 * Card probe function
 */

static int
rside_probe(device_t parent, cfdata_t cf, void *aux)
{
	/* if we're including this, then for now assume it exists */
	return 1;
}

/*
 * Card attach function
 *
 */

static void
rside_attach(device_t parent, device_t self, void *aux)
{
	struct rside_softc *sc = device_private(self);
	struct rsbus_attach_args *rs = aux;
	int channel, i;
	struct rside_channel *scp;
	struct ata_channel *cp;
	struct wdc_regs *wdr;

	aprint_normal("\n");

	/*
	 * we need our own bus tag as the register spacing
	 * is not the default.
	 *
	 * For the rsbus the bus tag cookie is the shift
	 * to apply to registers
	 * So duplicate the bus space tag and change the
	 * cookie.
	 */

	sc->sc_wdcdev.sc_atac.atac_dev = self;
	sc->sc_wdcdev.regs = sc->sc_wdc_regs;
	sc->sc_tag = *rs->sa_iot;
	sc->sc_tag.bs_cookie = (void *) DRIVE_REGISTER_SPACING_SHIFT;

	/* Fill in wdc and channel infos */
	sc->sc_wdcdev.sc_atac.atac_cap |= ATAC_CAP_DATA16;
	sc->sc_wdcdev.sc_atac.atac_pio_cap = 0;
	sc->sc_wdcdev.sc_atac.atac_channels = sc->sc_chanarray;
	sc->sc_wdcdev.sc_atac.atac_nchannels = 2;
	sc->sc_wdcdev.wdc_maxdrives = 2;
	for (channel = 0 ; channel < 2; channel++) {
		scp = &sc->rside_channels[channel];
		sc->sc_chanarray[channel] = &scp->rc_channel;
		cp = &scp->rc_channel;
		wdr = &sc->sc_wdc_regs[channel];

		cp->ch_channel = channel;
		cp->ch_atac = &sc->sc_wdcdev.sc_atac;
		wdr->cmd_iot = wdr->ctl_iot = &sc->sc_tag;
		if (bus_space_map(wdr->cmd_iot,
		    rside_info[channel].drive_registers,
		    DRIVE_REGISTERS_SPACE, 0, &wdr->cmd_baseioh)) 
			panic("couldn't map drive registers channel = %d,"
					"registers@0x08%x\n",
					channel,
					rside_info[channel].drive_registers);

		for (i = 0; i < WDC_NREG; i++) {
			if (bus_space_subregion(wdr->cmd_iot, wdr->cmd_baseioh,
				i * (DRIVE_REGISTER_BYTE_SPACING >> 2), 4,
				&wdr->cmd_iohs[i]) != 0) {
				bus_space_unmap(wdr->cmd_iot, wdr->cmd_baseioh,
				    DRIVE_REGISTERS_SPACE);
				continue;
			}
		}
		wdc_init_shadow_regs(wdr);

		if (bus_space_map(wdr->ctl_iot,
		    rside_info[channel].aux_register, 0x4, 0, &wdr->ctl_ioh))
		{
			bus_space_unmap(wdr->cmd_iot, wdr->cmd_baseioh,
			    DRIVE_REGISTERS_SPACE);
			continue;
		}

		/* attach it to the interrupt */
		if ((scp->rc_ih = intr_claim((channel == 0 ? IRQ_NEVENT1 : IRQ_NEVENT2),
						IPL_BIO, "rside", wdcintr, cp)) == NULL)
			panic("%s: Cannot claim interrupt %d\n",
			    device_xname(self),
			    (channel == 0 ? IRQ_NEVENT1 : IRQ_NEVENT2));

		wdcattach(cp);
	}
}