/*      $NetBSD: if_ex_pci.c,v 1.58 2018/12/09 11:14:02 jdolecek Exp $  */

/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Frank van der Linden; 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_ex_pci.c,v 1.58 2018/12/09 11:14:02 jdolecek Exp $");

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

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

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

#include <dev/mii/miivar.h>
#include <dev/mii/mii.h>

#include <dev/ic/elink3var.h>
#include <dev/ic/elink3reg.h>
#include <dev/ic/elinkxlreg.h>
#include <dev/ic/elinkxlvar.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>

struct ex_pci_softc {
       struct ex_softc sc_ex;

       /* PCI function status space. 556,556B requests it. */
       bus_space_tag_t sc_funct;
       bus_space_handle_t sc_funch;

       pci_chipset_tag_t psc_pc;       /* pci chipset tag */
       pcireg_t psc_regs[0x40>>2];     /* saved PCI config regs (sparse) */
       pcitag_t psc_tag;               /* pci device tag */
};

/*
* PCI constants.
* XXX These should be in a common file!
*/
#define PCI_CONN                0x48    /* Connector type */
#define PCI_CBIO PCI_BAR(0)    /* Configuration Base IO Address */
#define PCI_POWERCTL            0xe0
#define PCI_FUNCMEM PCI_BAR(2)

#define PCI_INTR                4
#define PCI_INTRACK             0x00008000

static int      ex_pci_match(device_t, cfdata_t, void *);
static void     ex_pci_attach(device_t, device_t, void *);
static void     ex_pci_intr_ack(struct ex_softc *);

static int      ex_pci_enable(struct ex_softc *);

static void     ex_pci_confreg_restore(struct ex_pci_softc *);
static int      ex_d3tod0(pci_chipset_tag_t, pcitag_t, device_t, pcireg_t);

CFATTACH_DECL_NEW(ex_pci, sizeof(struct ex_pci_softc),
   ex_pci_match, ex_pci_attach, NULL, NULL);

static const struct ex_pci_product {
       uint32_t        epp_prodid;     /* PCI product ID */
       int             epp_flags;      /* initial softc flags */
       const char      *epp_name;      /* device name */
} ex_pci_products[] = {
       { PCI_PRODUCT_3COM_3C900TPO,    0,
         "3c900-TPO Ethernet" },
       { PCI_PRODUCT_3COM_3C900COMBO,  0,
         "3c900-COMBO Ethernet" },

       { PCI_PRODUCT_3COM_3C905TX,     EX_CONF_MII,
         "3c905-TX 10/100 Ethernet" },
       { PCI_PRODUCT_3COM_3C905T4,     EX_CONF_MII,
         "3c905-T4 10/100 Ethernet" },

       { PCI_PRODUCT_3COM_3C900BTPO,   EX_CONF_90XB,
         "3c900B-TPO Ethernet" },
       { PCI_PRODUCT_3COM_3C900BCOMBO, EX_CONF_90XB,
         "3c900B-COMBO Ethernet" },
       { PCI_PRODUCT_3COM_3C900BTPC,   EX_CONF_90XB,
         "3c900B-TPC Ethernet" },

       { PCI_PRODUCT_3COM_3C905BTX,    EX_CONF_90XB|EX_CONF_MII|EX_CONF_INTPHY,
         "3c905B-TX 10/100 Ethernet" },
       { PCI_PRODUCT_3COM_3C905BT4,    EX_CONF_90XB|EX_CONF_MII,
         "3c905B-T4 10/100 Ethernet" },
       { PCI_PRODUCT_3COM_3C905BCOMBO, EX_CONF_90XB/*|EX_CONF_MII|EX_CONF_INTPHY*/,
         "3c905B-COMBO 10/100 Ethernet" },
       { PCI_PRODUCT_3COM_3C905BFX,    EX_CONF_90XB,
         "3c905B-FX 10/100 Ethernet" },

       /* XXX Internal PHY? */
       { PCI_PRODUCT_3COM_3C980SRV,    EX_CONF_90XB,
         "3c980 Server Adapter 10/100 Ethernet" },
       { PCI_PRODUCT_3COM_3C980CTXM,   EX_CONF_90XB|EX_CONF_MII,
         "3c980C-TXM 10/100 Ethernet" },

       { PCI_PRODUCT_3COM_3C905CTX,    EX_CONF_90XB|EX_CONF_MII,
         "3c905C-TX 10/100 Ethernet with mngmt" },

       { PCI_PRODUCT_3COM_3C450TX,             EX_CONF_90XB,
         "3c450-TX 10/100 Ethernet" },

       { PCI_PRODUCT_3COM_3CSOHO100TX, EX_CONF_90XB,
         "3cSOHO100-TX 10/100 Ethernet" },

       { PCI_PRODUCT_3COM_3C555,
          EX_CONF_90XB | EX_CONF_MII | EX_CONF_EEPROM_OFF |
          EX_CONF_EEPROM_8BIT,
         "3c555 MiniPCI 10/100 Ethernet" },

       { PCI_PRODUCT_3COM_3C556,
          EX_CONF_90XB | EX_CONF_MII | EX_CONF_EEPROM_OFF |
          EX_CONF_PCI_FUNCREG | EX_CONF_RESETHACK | EX_CONF_INV_LED_POLARITY |
          EX_CONF_PHY_POWER | EX_CONF_EEPROM_8BIT,
         "3c556 MiniPCI 10/100 Ethernet" },

       { PCI_PRODUCT_3COM_3C556B,
          EX_CONF_90XB | EX_CONF_MII | EX_CONF_EEPROM_OFF |
          EX_CONF_PCI_FUNCREG | EX_CONF_RESETHACK | EX_CONF_INV_LED_POLARITY |
          EX_CONF_PHY_POWER | EX_CONF_NO_XCVR_PWR,
         "3c556B MiniPCI 10/100 Ethernet" },

       { PCI_PRODUCT_3COM_3C905CXTX,   EX_CONF_90XB|EX_CONF_MII,
         "3c905CX-TX 10/100 Ethernet with mngmt" },

       { PCI_PRODUCT_3COM_3C920BEMBW,  EX_CONF_90XB|EX_CONF_MII,
         "3c920B-EMB-WNM Integrated Fast Ethernet" },

       { 0,                            0,
         NULL },
};

static const struct ex_pci_product *
ex_pci_lookup(const struct pci_attach_args *pa)
{
       const struct ex_pci_product *epp;

       if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_3COM)
               return (NULL);

       for (epp = ex_pci_products; epp->epp_name != NULL; epp++)
               if (PCI_PRODUCT(pa->pa_id) == epp->epp_prodid)
                       return (epp);
       return (NULL);
}

static int
ex_pci_match(device_t parent, cfdata_t match,
   void *aux)
{
       struct pci_attach_args *pa = (struct pci_attach_args *) aux;

       if (ex_pci_lookup(pa) != NULL)
               return (2);     /* beat ep_pci */

       return (0);
}

static void
ex_pci_attach(device_t parent, device_t self, void *aux)
{
       struct ex_pci_softc *psc = device_private(self);
       struct ex_softc *sc = &psc->sc_ex;
       struct pci_attach_args *pa = aux;
       pci_chipset_tag_t pc = pa->pa_pc;
       pci_intr_handle_t ih;
       const struct ex_pci_product *epp;
       const char *intrstr = NULL;
       int rev;
       int error;
       char intrbuf[PCI_INTRSTR_LEN];

       aprint_naive(": Ethernet controller\n");

       sc->sc_dev = self;

       if (pci_mapreg_map(pa, PCI_CBIO, PCI_MAPREG_TYPE_IO, 0,
           &sc->sc_iot, &sc->sc_ioh, NULL, NULL)) {
               aprint_error(": can't map i/o space\n");
               return;
       }

       epp = ex_pci_lookup(pa);
       if (epp == NULL) {
               printf("\n");
               panic("ex_pci_attach: impossible");
       }

       rev = PCI_REVISION(pci_conf_read(pc, pa->pa_tag, PCI_CLASS_REG));
       aprint_normal(": 3Com %s (rev. 0x%x)\n", epp->epp_name, rev);

       sc->sc_dmat = pa->pa_dmat;

       sc->ex_conf = epp->epp_flags;

       /* Enable the card. */
       pci_conf_write(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG,
           pci_conf_read(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG) |
           PCI_COMMAND_MASTER_ENABLE);

       psc->psc_pc = pc;
       psc->psc_tag = pa->pa_tag;
       psc->psc_regs[PCI_COMMAND_STATUS_REG>>2] =
           pci_conf_read(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);
       psc->psc_regs[PCI_BHLC_REG>>2] =
           pci_conf_read(pc, pa->pa_tag, PCI_BHLC_REG);
       psc->psc_regs[PCI_CBIO>>2] =
           pci_conf_read(pc, pa->pa_tag, PCI_CBIO);

       if (sc->ex_conf & EX_CONF_PCI_FUNCREG) {
               /* Map PCI function status window. */
               if (pci_mapreg_map(pa, PCI_FUNCMEM, PCI_MAPREG_TYPE_MEM, 0,
                   &psc->sc_funct, &psc->sc_funch, NULL, NULL)) {
                       aprint_error_dev(self,
                           "unable to map function status window\n");
                       return;
               }
               sc->intr_ack = ex_pci_intr_ack;

               psc->psc_regs[PCI_FUNCMEM>>2] =
                   pci_conf_read(pc, pa->pa_tag, PCI_FUNCMEM);
       }

       psc->psc_regs[PCI_INTERRUPT_REG>>2] =
           pci_conf_read(pc, pa->pa_tag, PCI_INTERRUPT_REG);
       /* power up chip */
       error = pci_activate(pa->pa_pc, pa->pa_tag, self, ex_d3tod0);
       switch (error) {
       case EOPNOTSUPP:
               break;
       case 0:
               sc->enable = ex_pci_enable;
               sc->disable = NULL;
               break;
       default:
               aprint_error_dev(self, "cannot activate %d\n", error);
               return;
       }
       sc->enabled = 1;

       /* Map and establish the interrupt. */
       if (pci_intr_map(pa, &ih)) {
               aprint_error_dev(self, "couldn't map interrupt\n");
               return;
       }

       intrstr = pci_intr_string(pc, ih, intrbuf, sizeof(intrbuf));
       sc->sc_ih = pci_intr_establish_xname(pc, ih, IPL_NET, ex_intr, sc,
           device_xname(self));
       if (sc->sc_ih == NULL) {
               aprint_error_dev(self, "couldn't establish interrupt");
               if (intrstr != NULL)
                       aprint_error(" at %s", intrstr);
               aprint_error("\n");
               return;
       }
       aprint_normal_dev(self, "interrupting at %s\n", intrstr);

       ex_config(sc);

       if (sc->ex_conf & EX_CONF_PCI_FUNCREG)
               bus_space_write_4(psc->sc_funct, psc->sc_funch, PCI_INTR,
                   PCI_INTRACK);

       if (sc->disable != NULL)
               ex_disable(sc);
}

static void
ex_pci_intr_ack(struct ex_softc *sc)
{
       struct ex_pci_softc *psc = (struct ex_pci_softc *)sc;

       bus_space_write_4(psc->sc_funct, psc->sc_funch, PCI_INTR,
           PCI_INTRACK);
}

static int
ex_d3tod0(pci_chipset_tag_t pc, pcitag_t tag, device_t self, pcireg_t state)
{

#define PCI_CACHE_LAT_BIST      0x0c
#define PCI_EXP_ROM_BAR         0x30
#define PCI_INT_GNT_LAT         0x3c

       uint32_t base0;
       uint32_t base1;
       uint32_t romaddr;
       uint32_t pci_int_lat;
       uint32_t pci_cache_lat;

       if (state != PCI_PMCSR_STATE_D3)
               return 0;

       aprint_normal_dev(self, "found in power state D%d, "
           "attempting to recover.\n", state);
       /* XXX is this needed? */
       (void)pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG);
       base0 = pci_conf_read(pc, tag, PCI_BAR0);
       base1 = pci_conf_read(pc, tag, PCI_BAR1);
       romaddr = pci_conf_read(pc, tag, PCI_EXP_ROM_BAR);
       pci_cache_lat= pci_conf_read(pc, tag, PCI_CACHE_LAT_BIST);
       pci_int_lat = pci_conf_read(pc, tag, PCI_INT_GNT_LAT);

       pci_conf_write(pc, tag, PCI_POWERCTL, 0);
       pci_conf_write(pc, tag, PCI_BAR0, base0);
       pci_conf_write(pc, tag, PCI_BAR1, base1);
       pci_conf_write(pc, tag, PCI_EXP_ROM_BAR, romaddr);
       pci_conf_write(pc, tag, PCI_INT_GNT_LAT, pci_int_lat);
       pci_conf_write(pc, tag, PCI_CACHE_LAT_BIST, pci_cache_lat);
       pci_conf_write(pc, tag, PCI_COMMAND_STATUS_REG,
           (PCI_COMMAND_MASTER_ENABLE | PCI_COMMAND_IO_ENABLE));
       aprint_normal_dev(self, "changed power state to D0.\n");
       return 0;
}

static void
ex_pci_confreg_restore(struct ex_pci_softc *psc)
{
       struct ex_softc *sc = (void *) psc;
       pcireg_t reg;

       reg = pci_conf_read(psc->psc_pc, psc->psc_tag, PCI_COMMAND_STATUS_REG);

       pci_conf_write(psc->psc_pc, psc->psc_tag,
           PCI_COMMAND_STATUS_REG,
           (reg & 0xffff0000) |
           (psc->psc_regs[PCI_COMMAND_STATUS_REG>>2] & 0xffff));
       pci_conf_write(psc->psc_pc, psc->psc_tag, PCI_BHLC_REG,
           psc->psc_regs[PCI_BHLC_REG>>2]);
       pci_conf_write(psc->psc_pc, psc->psc_tag, PCI_CBIO,
           psc->psc_regs[PCI_CBIO>>2]);
       if (sc->ex_conf & EX_CONF_PCI_FUNCREG)
               pci_conf_write(psc->psc_pc, psc->psc_tag, PCI_FUNCMEM,
                   psc->psc_regs[PCI_FUNCMEM>>2]);
       pci_conf_write(psc->psc_pc, psc->psc_tag, PCI_INTERRUPT_REG,
           psc->psc_regs[PCI_INTERRUPT_REG>>2]);
}

static int
ex_pci_enable(struct ex_softc *sc)
{
       struct ex_pci_softc *psc = (void *) sc;

       aprint_debug_dev(sc->sc_dev, "going to power state D0\n");

       /* Now restore the configuration registers. */
       ex_pci_confreg_restore(psc);

       return (0);
}

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