/*      $NetBSD: if_ie_obio.c,v 1.19 2023/12/20 05:13:35 thorpej Exp $  */

/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg and Matt Fredette.
*
* 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.
*/

/*-
* Copyright (c) 1995 Charles D. Cranor
* 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 ``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.
*/



/*
* Sun2 OBIO front-end for the Intel 82586 Ethernet driver
*
* Converted to SUN ie driver by Charles D. Cranor,
*              October 1994, January 1995.
*/

/*
* The i82586 is a very painful chip, found in sun[23]'s, sun-4/100's
* sun-4/200's, and VME based suns.  The byte order is all wrong for a
* SUN, making life difficult.  Programming this chip is mostly the same,
* but certain details differ from system to system.  This driver is
* written so that different "ie" interfaces can be controlled by the same
* driver.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_ie_obio.c,v 1.19 2023/12/20 05:13:35 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <sys/protosw.h>
#include <sys/socket.h>

#include <net/if.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_ether.h>

#include <uvm/uvm_extern.h>

#include <machine/bus.h>
#include <machine/intr.h>
#include <machine/autoconf.h>
#include <machine/idprom.h>

#include <dev/ic/i82586reg.h>
#include <dev/ic/i82586var.h>

/*
* the on-board interface
*/
struct ieob {
       u_char  obctrl;
};
#define IEOB_NORSET 0x80        /* don't reset the board */
#define IEOB_ONAIR  0x40        /* put us on the air */
#define IEOB_ATTEN  0x20        /* attention! */
#define IEOB_IENAB  0x10        /* interrupt enable */
#define IEOB_XXXXX  0x08        /* free bit */
#define IEOB_XCVRL2 0x04        /* level 2 transceiver? */
#define IEOB_BUSERR 0x02        /* bus error */
#define IEOB_INT    0x01        /* interrupt */

#define IEOB_ADBASE 0x000000  /* KVA base addr of 24 bit address space */


static void ie_obreset(struct ie_softc *, int);
static void ie_obattend(struct ie_softc *, int);
static void ie_obrun(struct ie_softc *);

int ie_obio_match(device_t, cfdata_t, void *);
void ie_obio_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(ie_obio, sizeof(struct ie_softc),
   ie_obio_match, ie_obio_attach, NULL, NULL);

/* Supported media */
static int media[] = {
       IFM_ETHER | IFM_10_2,
};
#define NMEDIA  __arraycount(media)


/*
* OBIO ie support routines
*/
void
ie_obreset(struct ie_softc *sc, int what)
{
       volatile struct ieob *ieo = (struct ieob *) sc->sc_reg;
       ieo->obctrl = 0;
       delay(100);                     /* XXX could be shorter? */
       ieo->obctrl = IEOB_NORSET;
}
void
ie_obattend(struct ie_softc *sc, int why)
{
       volatile struct ieob *ieo = (struct ieob *) sc->sc_reg;

       ieo->obctrl |= IEOB_ATTEN;      /* flag! */
       ieo->obctrl &= ~IEOB_ATTEN;     /* down. */
}

void
ie_obrun(struct ie_softc *sc)
{
       volatile struct ieob *ieo = (struct ieob *) sc->sc_reg;

       ieo->obctrl |= (IEOB_ONAIR|IEOB_IENAB|IEOB_NORSET);
}

void ie_obio_memcopyin(struct ie_softc *, void *, int, size_t);
void ie_obio_memcopyout(struct ie_softc *, const void *, int, size_t);

/*
* Copy board memory to kernel.
*/
void
ie_obio_memcopyin(struct ie_softc *sc, void *p, int offset, size_t size)
{

       bus_space_copyin(sc->bt, sc->bh, offset, p, size);
}

/*
* Copy from kernel space to naord memory.
*/
void
ie_obio_memcopyout(struct ie_softc *sc, const void *p, int offset, size_t size)
{

       bus_space_copyout(sc->bt, sc->bh, offset, p, size);
}

/* read a 16-bit value at BH offset */
uint16_t ie_obio_read16(struct ie_softc *, int);
/* write a 16-bit value at BH offset */
void ie_obio_write16(struct ie_softc *, int, uint16_t);
void ie_obio_write24(struct ie_softc *, int, int);

uint16_t
ie_obio_read16(struct ie_softc *sc, int offset)
{
       uint16_t v = bus_space_read_2(sc->bt, sc->bh, offset);

       return (((v&0xff)<<8) | ((v>>8)&0xff));
}

void
ie_obio_write16(struct ie_softc *sc, int offset, uint16_t v)
{

       v = (((v&0xff)<<8) | ((v>>8)&0xff));
       bus_space_write_2(sc->bt, sc->bh, offset, v);
}

void
ie_obio_write24(struct ie_softc *sc, int offset, int addr)
{
       u_char *f = (u_char *)&addr;
       uint16_t v0, v1;
       u_char *t;

       t = (u_char *)&v0;
       t[0] = f[3]; t[1] = f[2];
       bus_space_write_2(sc->bt, sc->bh, offset, v0);

       t = (u_char *)&v1;
       t[0] = f[1]; t[1] = 0;
       bus_space_write_2(sc->bt, sc->bh, offset+2, v1);
}

int
ie_obio_match(device_t parent, cfdata_t cf, void *aux)
{
       struct obio_attach_args *oba = aux;
       bus_space_handle_t bh;
       int matched;
       uint8_t ctrl;

       /* No default obio address. */
       if (oba->oba_paddr == -1)
               return 0;

       /* Make sure there is something there... */
       if (bus_space_map(oba->oba_bustag, oba->oba_paddr,
           sizeof(struct ieob), 0, &bh))
               return 0;
       matched = (!bus_space_poke_1(oba->oba_bustag, bh, 0, IEOB_NORSET) &&
               !bus_space_peek_1(oba->oba_bustag, bh, 0, &ctrl) &&
               (ctrl & (IEOB_ONAIR|IEOB_IENAB)) == 0);
       bus_space_unmap(oba->oba_bustag, bh, sizeof(struct ieob));
       if (!matched)
               return 0;

       /* Default interrupt priority. */
       if (oba->oba_pri == -1)
               oba->oba_pri = 3;

       return 1;
}

void
ie_obio_attach(device_t parent, device_t self, void *aux)
{
       struct obio_attach_args *oba = aux;
       struct ie_softc *sc = device_private(self);
       bus_dma_tag_t dmatag = oba->oba_dmatag;
       bus_space_handle_t bh;
       bus_dma_segment_t seg;
       int rseg;
       int error;
       paddr_t pa;
       bus_size_t memsize;
       u_long iebase;
       uint8_t myaddr[ETHER_ADDR_LEN];

       sc->sc_dev = self;
       sc->bt = oba->oba_bustag;

       sc->hwreset = ie_obreset;
       sc->chan_attn = ie_obattend;
       sc->hwinit = ie_obrun;
       sc->memcopyout = ie_obio_memcopyout;
       sc->memcopyin = ie_obio_memcopyin;

       sc->ie_bus_barrier = NULL;
       sc->ie_bus_read16 = ie_obio_read16;
       sc->ie_bus_write16 = ie_obio_write16;
       sc->ie_bus_write24 = ie_obio_write24;
       sc->sc_msize = memsize = 65536; /* XXX */

       if (bus_space_map(oba->oba_bustag, oba->oba_paddr, sizeof(struct ieob),
                       0, &bh))
               panic("ie_obio_attach: can't map regs");
       sc->sc_reg = (void *)bh;

       /*
        * Allocate control & buffer memory.
        */
       if ((error = bus_dmamap_create(dmatag, memsize, 1, memsize, 0,
           BUS_DMA_NOWAIT|BUS_DMA_24BIT, &sc->sc_dmamap)) != 0) {
               printf("%s: DMA map create error %d\n",
                       device_xname(self), error);
               return;
       }
       if ((error = bus_dmamem_alloc(dmatag, memsize, 64*1024, 0,
           &seg, 1, &rseg, BUS_DMA_NOWAIT | BUS_DMA_24BIT)) != 0) {
               printf("%s: DMA memory allocation error %d\n",
                       device_xname(self), error);
               return;
       }

       /* Map DMA buffer in CPU addressable space */
       if ((error = bus_dmamem_map(dmatag, &seg, rseg, memsize,
           (void **)&sc->sc_maddr, BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) != 0) {
               printf("%s: DMA buffer map error %d\n",
                       device_xname(self), error);
               bus_dmamem_free(dmatag, &seg, rseg);
               return;
       }

       /* Load the segment */
       if ((error = bus_dmamap_load(dmatag, sc->sc_dmamap,
           sc->sc_maddr, memsize, NULL, BUS_DMA_NOWAIT)) != 0) {
               printf("%s: DMA buffer map load error %d\n",
                       device_xname(self), error);
               bus_dmamem_unmap(dmatag, sc->sc_maddr, memsize);
               bus_dmamem_free(dmatag, &seg, rseg);
               return;
       }

       w16zero(sc->sc_maddr, memsize);
       sc->bh = (bus_space_handle_t)(sc->sc_maddr);

       /*
        * The i82586's 24-bit address space maps to all of
        * KVA space ().  In addition, the SCP must appear
        * at IE_SCP_ADDR within the 24-bit address space,
        * i.e. at KVA  IEOB_ADBASE+IE_SCP_ADDR, at the very top of
        * kernel space.  We double-map this last page to the first
        * page (starting at `maddr') of the memory we allocate to the chip.
        * (a side-effect of this double-map is that the ISCP and SCB
        * structures also get aliased there, but we ignore this). The
        * first page at `maddr' is only used for ISCP, SCB and the aliased
        * SCP; the actual buffers start at maddr+PAGE_SIZE.
        *
        * In a picture:

       |---//--- ISCP-SCB-----scp-|--//- buffers -//-|... |iscp-scb-----SCP-|
       |         |                |                  |    |             |   |
       |         |<---PAGE_SIZE-->|                  |    |<--PAGE_SIZE-+-->|
       |         |<------------ memsize ------------>|    |       ^     |
       |         |                                                |     |
       |         \@maddr                                 (last page dbl mapped)
       |                                                                |
       \@IEOB_ADBASE                           @IEOB_ADBASE+IE_SCP_ADDR-+

        *
        */

       /* Double map the SCP */
       if (pmap_extract(pmap_kernel(), (vaddr_t)sc->sc_maddr, &pa) == false)
               panic("ie pmap_extract");

       pmap_enter(pmap_kernel(), m68k_trunc_page(IEOB_ADBASE+IE_SCP_ADDR),
           pa | PMAP_NC /*| PMAP_IOC*/,
           VM_PROT_READ | VM_PROT_WRITE, PMAP_WIRED);

       /* Map iscp at location 0 (relative to `maddr') */
       sc->iscp = 0;

       /* scb follows iscp */
       sc->scb = IE_ISCP_SZ;

       /* scp is at the fixed location IE_SCP_ADDR (modulo the page size) */
       sc->scp = IE_SCP_ADDR & PGOFSET;

       /* Calculate the 24-bit base of i82586 operations */
       iebase = (u_long)sc->sc_dmamap->dm_segs[0].ds_addr -
                       (u_long)IEOB_ADBASE;
       ie_obio_write16(sc, IE_ISCP_SCB(sc->iscp), sc->scb);
       ie_obio_write24(sc, IE_ISCP_BASE(sc->iscp), iebase);
       ie_obio_write24(sc, IE_SCP_ISCP(sc->scp), iebase + sc->iscp);

       /*
        * Rest of first page is unused (wasted!); the other pages
        * are used for buffers.
        */
       sc->buf_area = PAGE_SIZE;
       sc->buf_area_sz = memsize - PAGE_SIZE;

       if (i82586_proberam(sc) == 0) {
               printf(": memory probe failed\n");
               return;
       }

       idprom_etheraddr(myaddr);
       i82586_attach(sc, "onboard", myaddr, media, NMEDIA, media[0]);

       /* Establish interrupt channel */
       bus_intr_establish(oba->oba_bustag, oba->oba_pri, IPL_NET, 0,
           i82586_intr, sc);
}

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