/*      $NetBSD: if_re_cardbus.c,v 1.27 2011/08/01 11:20:27 drochner Exp $      */

/*
* Copyright (c) 2004 Jonathan Stone
* 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. 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.
*/

/*
* if_re_cardbus.c:
*      Cardbus specific routines for Realtek 8169 ethernet adapter.
*      Tested for :
*              Netgear GA-511 (8169S)
*              Buffalo LPC-CB-CLGT
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_re_cardbus.c,v 1.27 2011/08/01 11:20:27 drochner Exp $");

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

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

#include <sys/bus.h>

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

#include <dev/cardbus/cardbusvar.h>

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

/*
* Default to using PIO access for this driver. On SMP systems,
* there appear to be problems with memory mapped mode: it looks like
* doing too many memory mapped access back to back in rapid succession
* can hang the bus. I'm inclined to blame this on crummy design/construction
* on the part of Realtek. Memory mapped mode does appear to work on
* uniprocessor systems though.
*/
#define RTK_USEIOSPACE

#include <dev/ic/rtl81x9reg.h>
#include <dev/ic/rtl81x9var.h>

#include <dev/ic/rtl8169var.h>

/*
* Various supported device vendors/types and their names.
*/
static const struct rtk_type re_cardbus_devs[] = {
       { PCI_VENDOR_REALTEK, PCI_PRODUCT_REALTEK_RT8169,
               RTK_8169, "Realtek 10/100/1000baseT" },
       { 0, 0, 0, NULL }
};

static int  re_cardbus_match(device_t, cfdata_t, void *);
static void re_cardbus_attach(device_t, device_t, void *);
static int  re_cardbus_detach(device_t, int);

struct re_cardbus_softc {
       struct rtk_softc sc_rtk;        /* real rtk softc */

       /* CardBus-specific goo. */
       void *sc_ih;
       cardbus_devfunc_t sc_ct;
       pcitag_t sc_tag;
       pcireg_t sc_csr;
       int sc_bar_reg;
       pcireg_t sc_bar_val;
};

CFATTACH_DECL_NEW(re_cardbus, sizeof(struct re_cardbus_softc),
   re_cardbus_match, re_cardbus_attach, re_cardbus_detach, re_activate);

const struct rtk_type *re_cardbus_lookup(const struct cardbus_attach_args *);

void re_cardbus_setup(struct re_cardbus_softc *);

int re_cardbus_enable(struct rtk_softc *);
void re_cardbus_disable(struct rtk_softc *);

const struct rtk_type *
re_cardbus_lookup(const struct cardbus_attach_args *ca)
{
       const struct rtk_type *t;

       for (t = re_cardbus_devs; t->rtk_name != NULL; t++) {
               if (PCI_VENDOR(ca->ca_id) == t->rtk_vid &&
                   PCI_PRODUCT(ca->ca_id) == t->rtk_did) {
                       return t;
               }
       }
       return NULL;
}

int
re_cardbus_match(device_t parent, cfdata_t cf, void *aux)
{
       struct cardbus_attach_args *ca = aux;

       if (re_cardbus_lookup(ca) != NULL)
               return 1;

       return 0;
}


void
re_cardbus_attach(device_t parent, device_t self, void *aux)
{
       struct re_cardbus_softc *csc = device_private(self);
       struct rtk_softc *sc = &csc->sc_rtk;
       struct cardbus_attach_args *ca = aux;
       cardbus_devfunc_t ct = ca->ca_ct;
       const struct rtk_type *t;
       bus_addr_t adr;

       sc->sc_dev = self;
       sc->sc_dmat = ca->ca_dmat;
       csc->sc_ct = ct;
       csc->sc_tag = ca->ca_tag;

       t = re_cardbus_lookup(ca);
       if (t == NULL) {
               aprint_error("\n");
               panic("%s: impossible", __func__);
        }
       aprint_normal(": %s\n", t->rtk_name);

       /*
        * Power management hooks.
        */
       sc->sc_enable = re_cardbus_enable;
       sc->sc_disable = re_cardbus_disable;

       /*
        * Map control/status registers.
        */
       csc->sc_csr = PCI_COMMAND_MASTER_ENABLE;
#ifdef RTK_USEIOSPACE
       if (Cardbus_mapreg_map(ct, RTK_PCI_LOIO, PCI_MAPREG_TYPE_IO, 0,
           &sc->rtk_btag, &sc->rtk_bhandle, &adr, &sc->rtk_bsize) == 0) {
               csc->sc_csr |= PCI_COMMAND_IO_ENABLE;
               csc->sc_bar_reg = RTK_PCI_LOIO;
               csc->sc_bar_val = adr | PCI_MAPREG_TYPE_IO;
       }
#else
       if (Cardbus_mapreg_map(ct, RTK_PCI_LOMEM, PCI_MAPREG_TYPE_MEM, 0,
           &sc->rtk_btag, &sc->rtk_bhandle, &adr, &sc->rtk_bsize) == 0) {
               csc->sc_csr |= PCI_COMMAND_MEM_ENABLE;
               csc->sc_bar_reg = RTK_PCI_LOMEM;
               csc->sc_bar_val = adr | PCI_MAPREG_TYPE_MEM;
       }
#endif
       else {
               aprint_error_dev(self, "unable to map deviceregisters\n");
               return;
       }
       /*
        * Handle power management nonsense and initialize the
        * configuration registers.
        */
       re_cardbus_setup(csc);

       sc->sc_dmat = ca->ca_dmat;
       re_attach(sc);

       /*
        * Power down the socket.
        */
       Cardbus_function_disable(csc->sc_ct);
}

int
re_cardbus_detach(device_t self, int flags)
{
       struct re_cardbus_softc *csc = device_private(self);
       struct rtk_softc *sc = &csc->sc_rtk;
       struct cardbus_devfunc *ct = csc->sc_ct;
       int rv;

#ifdef DIAGNOSTIC
       if (ct == NULL)
               panic("%s: cardbus softc, cardbus_devfunc NULL",
                     device_xname(self));
#endif

       rv = re_detach(sc);
       if (rv)
               return rv;

       /*
        * Unhook the interrupt handler.
        */
       if (csc->sc_ih != NULL)
               Cardbus_intr_disestablish(ct, csc->sc_ih);

       /*
        * Release bus space and close window.
        */
       if (csc->sc_bar_reg != 0)
               Cardbus_mapreg_unmap(ct, csc->sc_bar_reg,
                   sc->rtk_btag, sc->rtk_bhandle, sc->rtk_bsize);

       return 0;
}

void
re_cardbus_setup(struct re_cardbus_softc *csc)
{
       struct rtk_softc *sc = &csc->sc_rtk;
       cardbus_devfunc_t ct = csc->sc_ct;
       cardbus_chipset_tag_t cc = ct->ct_cc;
       cardbus_function_tag_t cf = ct->ct_cf;
       pcireg_t reg, command;
       int pmreg;

       /*
        * Handle power management nonsense.
        */
       if (cardbus_get_capability(cc, cf, csc->sc_tag,
           PCI_CAP_PWRMGMT, &pmreg, 0)) {
               command = Cardbus_conf_read(ct, csc->sc_tag,
                   pmreg + PCI_PMCSR);
               if (command & PCI_PMCSR_STATE_MASK) {
                       pcireg_t iobase, membase, irq;

                       /* Save important PCI config data. */
                       iobase = Cardbus_conf_read(ct, csc->sc_tag,
                           RTK_PCI_LOIO);
                       membase = Cardbus_conf_read(ct, csc->sc_tag,
                           RTK_PCI_LOMEM);
                       irq = Cardbus_conf_read(ct, csc->sc_tag,
                           PCI_INTERRUPT_REG);

                       /* Reset the power state. */
                       aprint_normal_dev(sc->sc_dev,
                           "chip is in D%d power mode -- setting to D0\n",
                           command & PCI_PMCSR_STATE_MASK);
                       command &= ~PCI_PMCSR_STATE_MASK;
                       Cardbus_conf_write(ct, csc->sc_tag,
                           pmreg + PCI_PMCSR, command);

                       /* Restore PCI config data. */
                       Cardbus_conf_write(ct, csc->sc_tag,
                           RTK_PCI_LOIO, iobase);
                       Cardbus_conf_write(ct, csc->sc_tag,
                           RTK_PCI_LOMEM, membase);
                       Cardbus_conf_write(ct, csc->sc_tag,
                           PCI_INTERRUPT_REG, irq);
               }
       }

       /* Program the BAR */
       Cardbus_conf_write(ct, csc->sc_tag, csc->sc_bar_reg, csc->sc_bar_val);

       /* Enable the appropriate bits in the CARDBUS CSR. */
       reg = Cardbus_conf_read(ct, csc->sc_tag, PCI_COMMAND_STATUS_REG);
       reg &= ~(PCI_COMMAND_IO_ENABLE|PCI_COMMAND_MEM_ENABLE);
       reg |= csc->sc_csr;
       Cardbus_conf_write(ct, csc->sc_tag, PCI_COMMAND_STATUS_REG, reg);

       /*
        * Make sure the latency timer is set to some reasonable
        * value.
        */
       reg = Cardbus_conf_read(ct, csc->sc_tag, PCI_BHLC_REG);
       if (PCI_LATTIMER(reg) < 0x40) {
               reg &= ~(PCI_LATTIMER_MASK << PCI_LATTIMER_SHIFT);
               reg |= (0x40 << PCI_LATTIMER_SHIFT);
               Cardbus_conf_write(ct, csc->sc_tag, PCI_BHLC_REG, reg);
       }
}

int
re_cardbus_enable(struct rtk_softc *sc)
{
       struct re_cardbus_softc *csc = (struct re_cardbus_softc *)sc;
       cardbus_devfunc_t ct = csc->sc_ct;

       /*
        * Power on the socket.
        */
       Cardbus_function_enable(ct);

       /*
        * Set up the PCI configuration registers.
        */
       re_cardbus_setup(csc);

       /*
        * Map and establish the interrupt.
        */
       csc->sc_ih = Cardbus_intr_establish(ct, IPL_NET, re_intr, sc);
       if (csc->sc_ih == NULL) {
               aprint_error_dev(sc->sc_dev,
                   "unable to establish interrupt\n");
               Cardbus_function_disable(csc->sc_ct);
               return 1;
       }
       return 0;
}

void
re_cardbus_disable(struct rtk_softc *sc)
{
       struct re_cardbus_softc *csc = (struct re_cardbus_softc *)sc;
       cardbus_devfunc_t ct = csc->sc_ct;

       /* Unhook the interrupt handler. */
       Cardbus_intr_disestablish(ct, csc->sc_ih);
       csc->sc_ih = NULL;

       /* Power down the socket. */
       Cardbus_function_disable(ct);
}

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