/*      $NetBSD: we.c,v 1.17 2010/03/19 15:59:22 tsutsui Exp $  */

/*-
 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * 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.
 */

/*
 * Device driver for National Semiconductor DS8390/WD83C690 based ethernet
 * adapters.
 *
 * Copyright (c) 1994, 1995 Charles M. Hannum.  All rights reserved.
 *
 * Copyright (C) 1993, David Greenman.  This software may be used, modified,
 * copied, distributed, and sold, in both source and binary form provided that
 * the above copyright and these terms are retained.  Under no circumstances is
 * the author responsible for the proper functioning of this software, nor does
 * the author assume any responsibility for damages incurred with its use.
 */

/*
 * Device driver for the Western Digital/SMC 8003 and 8013 series,
 * and the SMC Elite Ultra (8216).
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: we.c,v 1.17 2010/03/19 15:59:22 tsutsui Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/socket.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>

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

#include <net/if_ether.h>

#include <sys/bus.h>
#include <sys/bswap.h>
#include <sys/intr.h>

#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>

#include <dev/ic/dp8390reg.h>
#include <dev/ic/dp8390var.h>
#include <dev/ic/wereg.h>
#include <dev/ic/wevar.h>

#ifndef __BUS_SPACE_HAS_STREAM_METHODS
#define bus_space_read_region_stream_2  bus_space_read_region_2
#define bus_space_write_stream_2        bus_space_write_2
#define bus_space_write_region_stream_2 bus_space_write_region_2
#endif

static void     we_set_media(struct we_softc *, int);

static void     we_media_init(struct dp8390_softc *);

static int      we_mediachange(struct dp8390_softc *);
static void     we_mediastatus(struct dp8390_softc *, struct ifmediareq *);

static void     we_recv_int(struct dp8390_softc *);
static void     we_init_card(struct dp8390_softc *);
static int      we_write_mbuf(struct dp8390_softc *, struct mbuf *, int);
static int      we_ring_copy(struct dp8390_softc *, int, void *, u_short);
static void     we_read_hdr(struct dp8390_softc *, int, struct dp8390_ring *);
static int      we_test_mem(struct dp8390_softc *);

static inline void we_readmem(struct we_softc *, int, uint8_t *, int);

/*
 * Delay needed when switching 16-bit access to shared memory.
 */
#define WE_DELAY(wsc) delay(3)

/*
 * Enable card RAM, and 16-bit access.
 */
#define WE_MEM_ENABLE(wsc) \
if (((wsc)->sc_flags & WE_16BIT_NOTOGGLE) == 0) {                       \
        if ((wsc)->sc_flags & WE_16BIT_ENABLE)                          \
                bus_space_write_1((wsc)->sc_asict, (wsc)->sc_asich,     \
                    WE_LAAR, (wsc)->sc_laar_proto | WE_LAAR_M16EN);     \
        bus_space_write_1((wsc)->sc_asict, (wsc)->sc_asich,             \
            WE_MSR, wsc->sc_msr_proto | WE_MSR_MENB);                   \
        WE_DELAY((wsc));                                                \
}

/*
 * Disable card RAM, and 16-bit access.
 */
#define WE_MEM_DISABLE(wsc) \
if (((wsc)->sc_flags & WE_16BIT_NOTOGGLE) == 0) {                       \
        bus_space_write_1((wsc)->sc_asict, (wsc)->sc_asich,             \
            WE_MSR, (wsc)->sc_msr_proto);                               \
        if ((wsc)->sc_flags & WE_16BIT_ENABLE)                          \
                bus_space_write_1((wsc)->sc_asict, (wsc)->sc_asich,     \
                    WE_LAAR, (wsc)->sc_laar_proto);                     \
        WE_DELAY((wsc));                                                \
}

int
we_config(device_t self, struct we_softc *wsc, const char *typestr)
{
        struct dp8390_softc *sc = &wsc->sc_dp8390;
        uint8_t x;
        int i, forced_16bit = 0;

        /*
         * Allow user to override 16-bit mode.  8-bit takes precedence.
         */
        if (device_cfdata(self)->cf_flags & DP8390_FORCE_16BIT_MODE) {
                wsc->sc_flags |= WE_16BIT_ENABLE;
                forced_16bit = 1;
        }
        if (device_cfdata(self)->cf_flags & DP8390_FORCE_8BIT_MODE)
                wsc->sc_flags &= ~WE_16BIT_ENABLE;

        /* Registers are linear. */
        for (i = 0; i < 16; i++)
                sc->sc_reg_map[i] = i;

        /* Now we can use the NIC_{GET,PUT}() macros. */

        aprint_normal_dev(self, "%s Ethernet (%s-bit)\n",
            typestr, wsc->sc_flags & WE_16BIT_ENABLE ? "16" : "8");

        /* Get station address from EEPROM. */
        for (i = 0; i < ETHER_ADDR_LEN; i++)
                sc->sc_enaddr[i] =
                    bus_space_read_1(wsc->sc_asict, wsc->sc_asich, WE_PROM + i);

        /*
         * Set upper address bits and 8/16 bit access to shared memory.
         */
        if (sc->is790) {
                wsc->sc_laar_proto =
                    bus_space_read_1(wsc->sc_asict, wsc->sc_asich, WE_LAAR) &
                    ~WE_LAAR_M16EN;
                bus_space_write_1(wsc->sc_asict, wsc->sc_asich, WE_LAAR,
                    wsc->sc_laar_proto |
                    (wsc->sc_flags & WE_16BIT_ENABLE ? WE_LAAR_M16EN : 0));
        } else if ((wsc->sc_type & WE_SOFTCONFIG) ||
#ifdef TOSH_ETHER
            (wsc->sc_type == WE_TYPE_TOSHIBA1) ||
            (wsc->sc_type == WE_TYPE_TOSHIBA4) ||
#endif
            (forced_16bit) ||
            (wsc->sc_type == WE_TYPE_WD8013EBT)) {
                wsc->sc_laar_proto = (wsc->sc_maddr >> 19) & WE_LAAR_ADDRHI;
                if (wsc->sc_flags & WE_16BIT_ENABLE)
                        wsc->sc_laar_proto |= WE_LAAR_L16EN;
                bus_space_write_1(wsc->sc_asict, wsc->sc_asich, WE_LAAR,
                    wsc->sc_laar_proto |
                    (wsc->sc_flags & WE_16BIT_ENABLE ? WE_LAAR_M16EN : 0));
        }

        /*
         * Set address and enable interface shared memory.
         */
        if (sc->is790) {
                x = bus_space_read_1(wsc->sc_asict, wsc->sc_asich, WE790_HWR);
                bus_space_write_1(wsc->sc_asict, wsc->sc_asich,
                    WE790_HWR, x | WE790_HWR_SWH);
                bus_space_write_1(wsc->sc_asict, wsc->sc_asich, WE790_RAR,
                    ((wsc->sc_maddr >> WE790_RAR_OFF_SHIFT) & WE790_RAR_OFF) |
                    ((wsc->sc_maddr & (1 << WE790_RAR_BASE_SHIFT)) != 0 ?
                     WE790_RAR_BASE1 : WE790_RAR_BASE0) |
                    (bus_space_read_1(wsc->sc_asict, wsc->sc_asich, WE790_RAR) &
                     ~(WE790_RAR_OFF | WE790_RAR_BASE)));
                bus_space_write_1(wsc->sc_asict, wsc->sc_asich, WE790_HWR, x);
                wsc->sc_msr_proto = 0x00;
                sc->cr_proto = 0x00;
        } else {
#ifdef TOSH_ETHER
                if (wsc->sc_type == WE_TYPE_TOSHIBA1 ||
                    wsc->sc_type == WE_TYPE_TOSHIBA4) {
                        /* XXX MAGIC CONSTANTS XXX */
                        bus_space_write_1(wsc->sc_asict, wsc->sc_asich,
                            WE_MSR + 1,
                            ((wsc->sc_maddr >> 8) & 0xe0) | 0x04);
                        bus_space_write_1(wsc->sc_asict, wsc->sc_asich,
                            WE_MSR + 2,
                            ((wsc->sc_maddr >> 16) & 0x0f));
                        wsc->sc_msr_proto = WE_MSR_POW;
                } else
#endif
                        wsc->sc_msr_proto = (wsc->sc_maddr >> 13) &
                            WE_MSR_ADDR;

                sc->cr_proto = ED_CR_RD2;
        }

        bus_space_write_1(wsc->sc_asict, wsc->sc_asich, WE_MSR,
            wsc->sc_msr_proto | WE_MSR_MENB);
        WE_DELAY(wsc);

        /*
         * DCR gets:
         *
         *      FIFO threshold to 8, No auto-init Remote DMA,
         *      byte order=80x86.
         *
         * 16-bit cards also get word-wide DMA transfers.
         */
        sc->dcr_reg = ED_DCR_FT1 | ED_DCR_LS |
            (wsc->sc_flags & WE_16BIT_ENABLE ? ED_DCR_WTS : 0);

        sc->test_mem = we_test_mem;
        sc->ring_copy = we_ring_copy;
        sc->write_mbuf = we_write_mbuf;
        sc->read_hdr = we_read_hdr;
        sc->recv_int = we_recv_int;
        sc->init_card = we_init_card;

        sc->sc_mediachange = we_mediachange;
        sc->sc_mediastatus = we_mediastatus;

        sc->mem_start = 0;
        /* sc->mem_size has to be set by frontend */

        sc->sc_flags = device_cfdata(self)->cf_flags;

        /* Do generic parts of attach. */
        if (wsc->sc_type & WE_SOFTCONFIG)
                sc->sc_media_init = we_media_init;
        else
                sc->sc_media_init = dp8390_media_init;
        if (dp8390_config(sc)) {
                aprint_error_dev(self, "configuration failed\n");
                return 1;
        }

        /*
         * Disable 16-bit access to shared memory - we leave it disabled
         * so that:
         *
         *      (1) machines reboot properly when the board is set to
         *          16-bit mode and there are conflicting 8-bit devices
         *          within the same 128k address space as this board's
         *          shared memory, and
         *
         *      (2) so that other 8-bit devices with shared memory
         *          in this same 128k address space will work.
         */
        WE_MEM_DISABLE(wsc);

        return 0;
}

static int
we_test_mem(struct dp8390_softc *sc)
{
        struct we_softc *wsc = (struct we_softc *)sc;
        bus_space_tag_t memt = sc->sc_buft;
        bus_space_handle_t memh = sc->sc_bufh;
        bus_size_t memsize = sc->mem_size;
        int i;

        if (wsc->sc_flags & WE_16BIT_ENABLE)
                bus_space_set_region_2(memt, memh, 0, 0, memsize >> 1);
        else
                bus_space_set_region_1(memt, memh, 0, 0, memsize);

        if (wsc->sc_flags & WE_16BIT_ENABLE) {
                for (i = 0; i < memsize; i += 2) {
                        if (bus_space_read_2(memt, memh, i) != 0)
                                goto fail;
                }
        } else {
                for (i = 0; i < memsize; i++) {
                        if (bus_space_read_1(memt, memh, i) != 0)
                                goto fail;
                }
        }

        return 0;

 fail:
        aprint_error_dev(sc->sc_dev,
            "failed to clear shared memory at offset 0x%x\n", i);
        WE_MEM_DISABLE(wsc);
        return 1;
}

/*
 * Given a NIC memory source address and a host memory destination address,
 * copy 'len' from NIC to host using shared memory.  The 'len' is rounded
 * up to a word - ok as long as mbufs are word-sized.
 */
static inline void
we_readmem(struct we_softc *wsc, int from, uint8_t *to, int len)
{
        bus_space_tag_t memt = wsc->sc_dp8390.sc_buft;
        bus_space_handle_t memh = wsc->sc_dp8390.sc_bufh;

        if (len & 1)
                ++len;

        if (wsc->sc_flags & WE_16BIT_ENABLE)
                bus_space_read_region_stream_2(memt, memh, from,
                    (uint16_t *)to, len >> 1);
        else
                bus_space_read_region_1(memt, memh, from,
                    to, len);
}

static int
we_write_mbuf(struct dp8390_softc *sc, struct mbuf *m, int buf)
{
        struct we_softc *wsc = (struct we_softc *)sc;
        bus_space_tag_t memt = wsc->sc_dp8390.sc_buft;
        bus_space_handle_t memh = wsc->sc_dp8390.sc_bufh;
        uint8_t *data, savebyte[2];
        int savelen, len, leftover;
#ifdef DIAGNOSTIC
        uint8_t *lim;
#endif

        savelen = m->m_pkthdr.len;

        WE_MEM_ENABLE(wsc);

        /*
         * 8-bit boards are simple; no alignment tricks are necessary.
         */
        if ((wsc->sc_flags & WE_16BIT_ENABLE) == 0) {
                for (; m != NULL; buf += m->m_len, m = m->m_next)
                        bus_space_write_region_1(memt, memh,
                            buf, mtod(m, uint8_t *), m->m_len);
                if (savelen < ETHER_MIN_LEN - ETHER_CRC_LEN) {
                        bus_space_set_region_1(memt, memh,
                            buf, 0, ETHER_MIN_LEN - ETHER_CRC_LEN - savelen);
                        savelen = ETHER_MIN_LEN - ETHER_CRC_LEN;
                }
                goto out;
        }

        /* Start out with no leftover data. */
        leftover = 0;
        savebyte[0] = savebyte[1] = 0;

        for (; m != NULL; m = m->m_next) {
                len = m->m_len;
                if (len == 0)
                        continue;
                data = mtod(m, uint8_t *);
#ifdef DIAGNOSTIC
                lim = data + len;
#endif
                while (len > 0) {
                        if (leftover) {
                                /*
                                 * Data left over (from mbuf or realignment).
                                 * Buffer the next byte, and write it and
                                 * the leftover data out.
                                 */
                                savebyte[1] = *data++;
                                len--;
                                bus_space_write_stream_2(memt, memh, buf,
                                    *(uint16_t *)savebyte);
                                buf += 2;
                                leftover = 0;
                        } else if (BUS_SPACE_ALIGNED_POINTER(data, uint16_t)
                            == 0) {
                                /*
                                 * Unaligned dta; buffer the next byte.
                                 */
                                savebyte[0] = *data++;
                                len--;
                                leftover = 1;
                        } else {
                                /*
                                 * Aligned data; output contiguous words as
                                 * much as we can, then buffer the remaining
                                 * byte, if any.
                                 */
                                leftover = len & 1;
                                len &= ~1;
                                bus_space_write_region_stream_2(memt, memh,
                                    buf, (uint16_t *)data, len >> 1);
                                data += len;
                                buf += len;
                                if (leftover)
                                        savebyte[0] = *data++;
                                len = 0;
                        }
                }
                if (len < 0)
                        panic("we_write_mbuf: negative len");
#ifdef DIAGNOSTIC
                if (data != lim)
                        panic("we_write_mbuf: data != lim");
#endif
        }
        if (leftover) {
                savebyte[1] = 0;
                bus_space_write_stream_2(memt, memh, buf,
                    *(uint16_t *)savebyte);
                buf += 2;
        }
        if (savelen < ETHER_MIN_LEN - ETHER_CRC_LEN) {
                bus_space_set_region_2(memt, memh,
                    buf, 0, (ETHER_MIN_LEN - ETHER_CRC_LEN - savelen) >> 1);
                savelen = ETHER_MIN_LEN - ETHER_CRC_LEN;
        }

 out:
        WE_MEM_DISABLE(wsc);

        return savelen;
}

static int
we_ring_copy(struct dp8390_softc *sc, int src, void *dstv, u_short amount)
{
        uint8_t *dst = dstv;
        struct we_softc *wsc = (struct we_softc *)sc;
        u_short tmp_amount;

        /* Does copy wrap to lower addr in ring buffer? */
        if (src + amount > sc->mem_end) {
                tmp_amount = sc->mem_end - src;

                /* Copy amount up to end of NIC memory. */
                we_readmem(wsc, src, dst, tmp_amount);

                amount -= tmp_amount;
                src = sc->mem_ring;
                dst += tmp_amount;
        }

        we_readmem(wsc, src, dst, amount);

        return src + amount;
}

static void
we_read_hdr(struct dp8390_softc *sc, int packet_ptr,
    struct dp8390_ring *packet_hdrp)
{
        struct we_softc *wsc = (struct we_softc *)sc;

        we_readmem(wsc, packet_ptr, (uint8_t *)packet_hdrp,
            sizeof(struct dp8390_ring));
#if BYTE_ORDER == BIG_ENDIAN
        packet_hdrp->count = bswap16(packet_hdrp->count);
#endif
}

static void
we_recv_int(struct dp8390_softc *sc)
{
        struct we_softc *wsc = (struct we_softc *)sc;

        WE_MEM_ENABLE(wsc);
        dp8390_rint(sc);
        WE_MEM_DISABLE(wsc);
}

static void
we_media_init(struct dp8390_softc *sc)
{
        struct we_softc *wsc = (struct we_softc *)sc;
        int defmedia = IFM_ETHER;
        uint8_t x;

        if (sc->is790) {
                x = bus_space_read_1(wsc->sc_asict, wsc->sc_asich, WE790_HWR);
                bus_space_write_1(wsc->sc_asict, wsc->sc_asich, WE790_HWR,
                    x | WE790_HWR_SWH);
                if (bus_space_read_1(wsc->sc_asict, wsc->sc_asich, WE790_GCR) &
                    WE790_GCR_GPOUT)
                        defmedia |= IFM_10_2;
                else
                        defmedia |= IFM_10_5;
                bus_space_write_1(wsc->sc_asict, wsc->sc_asich, WE790_HWR,
                    x & ~WE790_HWR_SWH);
        } else {
                x = bus_space_read_1(wsc->sc_asict, wsc->sc_asich, WE_IRR);
                if (x & WE_IRR_OUT2)
                        defmedia |= IFM_10_2;
                else
                        defmedia |= IFM_10_5;
        }

        ifmedia_init(&sc->sc_media, 0, dp8390_mediachange, dp8390_mediastatus);
        ifmedia_add(&sc->sc_media, IFM_ETHER | IFM_10_2, 0, NULL);
        ifmedia_add(&sc->sc_media, IFM_ETHER | IFM_10_5, 0, NULL);
        ifmedia_set(&sc->sc_media, defmedia);
}

static int
we_mediachange(struct dp8390_softc *sc)
{

        /*
         * Current media is already set up.  Just reset the interface
         * to let the new value take hold.  The new media will be
         * set up in we_init_card() called via dp8390_init().
         */
        dp8390_reset(sc);
        return 0;
}

static void
we_mediastatus(struct dp8390_softc *sc, struct ifmediareq *ifmr)
{
        struct ifmedia *ifm = &sc->sc_media;

        /*
         * The currently selected media is always the active media.
         */
        ifmr->ifm_active = ifm->ifm_cur->ifm_media;
}

static void
we_init_card(struct dp8390_softc *sc)
{
        struct we_softc *wsc = (struct we_softc *)sc;
        struct ifmedia *ifm = &sc->sc_media;

        if (wsc->sc_init_hook)
                (*wsc->sc_init_hook)(wsc);

        we_set_media(wsc, ifm->ifm_cur->ifm_media);
}

static void
we_set_media(struct we_softc *wsc, int media)
{
        struct dp8390_softc *sc = &wsc->sc_dp8390;
        bus_space_tag_t asict = wsc->sc_asict;
        bus_space_handle_t asich = wsc->sc_asich;
        uint8_t hwr, gcr, irr;

        if (sc->is790) {
                hwr = bus_space_read_1(asict, asich, WE790_HWR);
                bus_space_write_1(asict, asich, WE790_HWR,
                    hwr | WE790_HWR_SWH);
                gcr = bus_space_read_1(asict, asich, WE790_GCR);
                if (IFM_SUBTYPE(media) == IFM_10_2)
                        gcr |= WE790_GCR_GPOUT;
                else
                        gcr &= ~WE790_GCR_GPOUT;
                bus_space_write_1(asict, asich, WE790_GCR,
                    gcr | WE790_GCR_LIT);
                bus_space_write_1(asict, asich, WE790_HWR,
                    hwr & ~WE790_HWR_SWH);
                return;
        }

        irr = bus_space_read_1(wsc->sc_asict, wsc->sc_asich, WE_IRR);
        if (IFM_SUBTYPE(media) == IFM_10_2)
                irr |= WE_IRR_OUT2;
        else
                irr &= ~WE_IRR_OUT2;
        bus_space_write_1(wsc->sc_asict, wsc->sc_asich, WE_IRR, irr);
}